Image pickup lens

Abstract

An imaging lens for a solid-state imaging sensor includes, in order from an object side to an image side of the imaging lens, a first through sixth lens. The first lens has positive refractive power. The second lens has positive refractive power. The third lens has negative refractive power. The fourth lens has positive or negative refractive power and aspheric surfaces facing the object side and the image side. The fifth lens has positive refractive power. The sixth lens has negative refractive power and aspheric surfaces facing the object side and the image side.

Claims

1. An imaging lens for a solid-state imaging sensor, comprising, in order from an object side to an image side of the imaging lens: a first lens having positive refractive power; a second lens having positive refractive power; a third lens having negative refractive power; a fourth lens having positive or negative refractive power and aspheric surfaces facing the object side and the image side; a fifth lens having positive refractive power; and a sixth lens having negative refractive power and aspheric surfaces facing the object side and the image side; wherein conditional expressions (1), and (9) to (12) below are satisfied:
0.84<|r1/f| (1)
20<νd4<30 (9)
50<νd5<80 (10)
50<νd6<80 (11)
0.80<ih/f<1.1 (12) where f: overall focal length of the imaging lens, r1: curvature radius of an object-side surface of the first lens, νd4: Abbe number of the fourth lens at d-ray, νd5: Abbe number of the fifth lens at d-ray, νd6: Abbe number of the sixth lens at d-ray, and ih: maximum image height.

2. The imaging lens according to claim 1, wherein the second lens has convex surfaces facing the object side and the image side, and a conditional expression (4) below is satisfied:
−0.40<(r3+r4)/(r3−r4)<0.90 (4) where r3: curvature radius of an object-side surface of the second lens, and r4: curvature radius of an image-side surface of the second lens.

3. The imaging lens according to claim 1, wherein the third lens has a concave surface facing the image side and aspheric surfaces facing the object side and the image side, the fifth lens has a convex surface facing the image side and aspheric surfaces facing the object side and the image side, and an image-side surface of the sixth lens is concave and has a pole point separated from an optical axis of the imaging lens.

4. The imaging lens according to claim 1, wherein a conditional expression (2) below is satisfied:
1.0<f1/f (2) where f1: focal length of the first lens.

5. The imaging lens according to claim 4, wherein the fourth lens satisfies a conditional expression (5) below:
0.8<|f4/f| (5) where f4: focal length of the fourth lens.

6. The imaging lens according to claim 1, wherein a conditional expression (13) below is satisfied:
−1.7<f2/f3<−0.5 (13) where f2: focal length of the second lens, and f3: focal length of the third lens.

7. The imaging lens according to claim 1, wherein a conditional expression (14) below is satisfied:
−2.3<f5/f6<−0.6 (14) where f5: focal length of the fifth lens, and f6: focal length of the sixth lens.

8. The imaging lens according to claim 1, wherein the first lens, the second lens, and the third lens respectively satisfy conditional expressions (6) to (8) below:
50<νd1<80 (6)
50<νd2<80 (7)
20<νd3<30 (8) where νd1: Abbe number of the first lens at d-ray, νd2: Abbe number of the second lens at d-ray, and νd3: Abbe number of the third lens at d-ray.

9. An imaging lens for a solid-state imaging sensor, comprising, in order from an object side to an image side of the imaging lens: a first lens having positive or negative refractive power; a second lens having positive refractive power and convex surfaces facing the object side and the image side; a third lens that is a meniscus lens having a concave surface facing the image side; a fourth lens that is a meniscus lens having aspheric surfaces facing the object side and the image side; a fifth lens; and a sixth lens having negative refractive power and aspheric surfaces facing the object side and the image side, wherein conditional expressions (6), (11), and (12a) below are satisfied:
50<νd1<80 (6)
50<νd6<80 (11)
0.85<ih/f<1.1 (12a) where νd1: Abbe number of the first lens at d-ray, νd6: Abbe number of the sixth lens at d-ray, ih: maximum image height, and f: overall focal length of the imaging lens.

10. The imaging lens according to claim 9, wherein the second lens has convex surfaces facing the object side and the image side, and a conditional expression (4) below is satisfied:
−0.40<(r3+r4)/(r3−r4)<0.90 (4) where r3: curvature radius of an object-side surface of the second lens, and r4: curvature radius of an image-side surface of the second lens.

11. The imaging lens according to claim 9, wherein the fourth lens satisfies a conditional expression (5) below:
0.8<|f4/f| (5) where f4: focal length of the fourth lens.

12. The imaging lens according to claim 9, wherein a conditional expression (13) below is satisfied:
−1.7<f2/f3<−0.5 (13) where f2: focal length of the second lens, and f3: focal length of the third lens.

13. The imaging lens according to claim 9, wherein a conditional expression (14) below is satisfied:
−2.3<f5/f6<−0.6 (14) where f5: focal length of the fifth lens, and f6: focal length of the sixth lens.

14. The imaging lens according to claim 9, wherein the second lens and the third lens respectively satisfy conditional expressions (7) and (8) below:
50<νd2<80 (7)
20<νd3<30 (8) where νd2: Abbe number of the second lens at d-ray, and νd3: Abbe number of the third lens at d-ray.

15. An imaging lens for a solid-state imaging sensor, comprising, in order from an object side to an image side of the imaging lens: a first lens having positive refractive power; a second lens having positive refractive power and convex surfaces facing the object side and the image side; a third lens; a fourth lens having aspheric surfaces facing the object side and the image side; a fifth lens; and a sixth lens that is a meniscus lens having negative refractive power and aspheric surfaces facing the object side and the image side, wherein a conditional expression (12a) below is satisfied:
0.85<ih/f<1.1 (12a) where ih: maximum image height, and f: overall focal length of the imaging lens.

16. The imaging lens according to claim 15, wherein the second lens has convex surfaces facing the object side and the image side, and a conditional expression (4) below is satisfied:
−0.40<(r3+r4)/(r3−r4)<0.90 (4) where r3: curvature radius of an object-side surface of the second lens, and r4: curvature radius of an image-side surface of the second lens.

17. The imaging lens according to claim 15, wherein the third lens has a concave surface facing the image side and aspheric surfaces facing the object side and the image side, the fifth lens has a convex surface facing the image side and aspheric surfaces facing the object side and the image side, and an image-side surface of the sixth lens is concave and has a pole point separated from an optical axis of the imaging lens.

18. The imaging lens according to claim 15, wherein the fourth lens satisfies a conditional expression (5) below:
0.8<|f4/f| (5) where f4: focal length of the fourth lens.

19. The imaging lens according to claim 15, wherein a conditional expression (13) below is satisfied:
−1.7<f2/f3<−0.5 (13) where f2: focal length of the second lens f3: focal length of the third lens.

20. The imaging lens according to claim 15, wherein the first lens, the second lens, and the third lens respectively satisfy conditional expressions (6) to (8) below:
50<νd1<80 (6)
50<νd2<80 (7)
20<νd3<30 (8) where νd1: Abbe number of the first lens at d-ray, νd2: Abbe number of the second lens at d-ray, and νd3: Abbe number of the third lens at d-ray.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic view showing the general configuration of an imaging lens in Example 1;

(2) FIG. 2 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 1;

(3) FIG. 3 is a schematic view showing the general configuration of an imaging lens in Example 2;

(4) FIG. 4 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 2;

(5) FIG. 5 is a schematic view showing the general configuration of an imaging lens in Example 3;

(6) FIG. 6 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 3;

(7) FIG. 7 is a schematic view showing the general configuration of an imaging lens in Example 4;

(8) FIG. 8 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 4;

(9) FIG. 9 is a schematic view showing the general configuration of an imaging lens in Example 5;

(10) FIG. 10 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 5;

(11) FIG. 11 is a schematic view showing the general configuration of an imaging lens in Example 6;

(12) FIG. 12 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 6;

(13) FIG. 13 is a schematic view showing the general configuration of an imaging lens in Example 7;

(14) FIG. 14 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 7;

(15) FIG. 15 is a schematic view showing the general configuration of an imaging lens in Example 8;

(16) FIG. 16 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 8;

(17) FIG. 17 is a schematic view showing the general configuration of an imaging lens in Example 9;

(18) FIG. 18 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 9;

(19) FIG. 19 is a schematic view showing the general configuration of an imaging lens in Example 10;

(20) FIG. 20 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 10;

(21) FIG. 21 is a schematic view showing the general configuration of an imaging lens in Example 11;

(22) FIG. 22 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 11;

(23) FIG. 23 is a schematic view showing the general configuration of an imaging lens in Example 12;

(24) FIG. 24 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 12;

(25) FIG. 25 is a schematic view showing the general configuration of an imaging lens in Example 13;

(26) FIG. 26 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 13;

(27) FIG. 27 is a schematic view showing the general configuration of an imaging lens in Example 14;

(28) FIG. 28 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 14;

(29) FIG. 29 is a schematic view showing the general configuration of an imaging lens in Example 15;

(30) FIG. 30 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 15;

(31) FIG. 31 is a schematic view showing the general configuration of an imaging lens in Example 16;

(32) FIG. 32 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 16.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(33) Hereinafter, the preferred embodiment of the present invention will be described in detail referring to the accompanying drawings.

(34) FIGS. 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, and 31 are schematic views showing the general configurations of the imaging lenses in Examples 1 to 16 according to this embodiment, respectively. Since all these examples have the same basic lens configuration, the general configuration of an imaging lens according to this embodiment is explained below mainly referring to the schematic view of Example 1.

(35) As shown in FIG. 1, the imaging lens according to this embodiment includes, in order from an object side to an image side, a first lens L1 with positive refractive power, an aperture stop ST, a second lens L2 with positive refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, and a sixth lens L6 with negative refractive power.

(36) A filter IR is arranged between the sixth lens L6 and an imaging plane IM. The filter IR is omissible.

(37) In the imaging lens of the preferred embodiment, the first lens L1 has relatively weak positive refractive power in the imaging lens, and has a meniscus shape and concave surface on the object side. The lens has an advantageous configuration for achieving a wide field of view by forming the object-side surface as a large curvature radius and taking incident light rays from a wide angle. Also, by setting the refractive power weak and positive, spherical aberrations and coma aberrations of the second lens L2 are properly corrected as reducing an influence on the refractive power of the overall optical system of the imaging lens. The shape and refractive power of the first lens L1 is not limited to the embodiment of the Example 1, and is set as a proper shape and refractive power according to the refractive power and shape of the lens group arranged closer to the image side than the first lens L1. It is important that the first lens L1 have a function to neutralize spherical aberrations toward a minus direction of the second lens L2, and the first lens preferably has positive or negative refractive power having such a function. For example, the Examples 1 to 8 and 11 are examples in which weak positive refractive power is set for the first lens L1, and the Examples 9 and 10 are examples in which weak negative refractive power is set for the first lens L1. Also, it is possible to adopt various shapes. For example, the Example 10 is an example in which the first lens L1 as a meniscus shape has a convex surface with a large curvature radius on the object-side, and the Examples 11, 15 and 16 is examples in which the first lens L1 has a biconvex shape with a large curvature radius on the object-side surface. In all of the Examples, the both sides of the first lens L1 have proper aspheric surfaces, and aberrations are corrected more effectively.

(38) The second lens L2 has a biconvex shape with a convex surface both on the object-side surface and the image-side surface, a short total track length is achieved by generating strong positive refractive power on t the convex surfaces on the object-side and image-side. Also, the third lens as a meniscus lens has negative refractive power and a convex surface on the object-side and a concave surface on the image-side, and corrects chromatic aberrations of the first lens L1 and the second lens L2. It is possible to adopt various shapes for the third lens L3. For example, Example 12, Example 15 and Example 16 are examples in which the third lens L3 has a biconcave shape on the both surfaces, and Example 13 and Example 14 are examples in which the third lens L3 as a meniscus shape has a concave surface on the object-side and a convex surface on the image-side. If the object-side surface of the third lens L3 is a concave surface, the polarization angle of a light ray which is emitted from the convex surface of the image side of the second lens L2 and passes through the surface can be relatively suppressed. Therefore, the third lens L3 properly corrects chromatic aberrations of the first lens L1 and the second lens L2 while mainly preventing coma aberrations and astigmatism.

(39) The fourth lens L4 as a meniscus shape has aspheric surfaces on both sides with relatively weak negative refractive power, and a convex surface on the object-side and a concave surface on the image-side, and mainly corrects astigmatism, coma aberrations and spherical aberrations. Since the fourth lens correct aberrations, the shape thereof differs depending on aberration to be corrected. For example, the Example 4 and the Example 5 are examples of biconcave shape, in which the N Example 12, the Example 15 and the Example 16 are examples of biconvex shape, and the Example 13 and the Example 14 are examples as a meniscus shape having a convex surface on the image side. If a biconcave shape is adopted, it is possible to correct spherical aberrations and axial chromatic aberrations as well.

(40) The fifth lens L5 as a meniscus shape has positive refractive power and a concave surface on the object side and a convex surface on the image side, and the positive refractive power is strong and a short total track length is achieved as well as the second lens L2. Also, the fifth lens L5 has an aspheric surface of which the positive refractive power is weakened toward the peripheral area of the lens, and that makes it easy to suppress an emission angle of an off-axial light ray emitted from the fifth lens L5 and enter the sixth lens L6. Thereby, various off-axial aberrations, in particular astigmatism, and field curvature are properly corrected. The fifth lens L5 has a convex surface on the image side, and an aspheric surface may be made of which positive refractive power is weakened toward the peripheral area of the lens. The fifth lens L5 may be made as a biconvex shape with a convex surface on the object side as well as Example 4.

(41) The sixth lens L6 has a biconcave shape having concave surfaces on both of the object side and the image side. The sixth lens L6 easily secures back focus by arranging a lens having negative refractive power at the nearest position to the image side. Also, on the object-side surface and the image-side surface, the sixth lens L6 has aspheric surfaces with a pole point off the optical axis X. The refractive power of the sixth lens L6 having such aspheric surfaces becomes negative refractive power near the optical axis X. However, the refractive power continuously changes as the negative refractive power is weakened toward the peripheral area of the lens, and becomes positive refractive power in the peripheral area of the lens. By properly changing refractive power, distortion and field curvature are properly corrected. The sixth lens L6 may have a shape which enables to secure proper back focus and to obtain an effect for correction of distortion and field curvature, and as shown in the Examples 4 to 16, the sixth lens L6 may have a meniscus shape with a convex surface on the object side. In this case, if the object-side surface of the sixth lens L6 has an aspheric surface with at least one pole point off the optical axis X, astigmatism may be easily reduced and contribution is made to improvement of image quality in the peripheral area of the lens.

(42) Also, in FIG. 1, an aperture stop ST is arranged between the first lens L1 and the second lens L2, and both opposite surfaces interposing the aperture stop ST have a convex surface each other. As an aberration of each surface is easily neutralized by interposing the aperture stop ST, it would be advantageous for a wide field of view and high brightness. As shown in the Example 10 and the Example 11, when an aperture stop ST is arranged between the image-side surface of the second lens L2 and the object-side surface of the third lens L3, opposite surfaces interposing the aperture stop ST are convex each other in a similar manner, and the similar effect is obtained. When the aperture stop is arranged closer to the image side than the third lens L3, an exit pupil position is moved toward the image side and it becomes difficult to control the incident angle of a main light ray to an imaging sensor. If the incident angle takes precedence, it is not desirable as the total track length becomes long accordingly.

(43) According to this embodiment, all the constituent lenses of the imaging lens are made of plastic material, and the manufacturing process is facilitated and mass production at low cost can be achieved. Also, in this embodiment, all the lens surfaces are made as aspheric shapes, and proper correction of aberrations can be achieved.

(44) As Materials for the lens, a glass material can be used when further enhancement of performance is desirable. Also, a spherical surface which is easy in manufacturing may be adopted for the lens surface depending on the required performance.

(45) When the imaging lens according to this embodiment satisfies conditional expressions (1) to (14) below, it brings about advantageous effects:
0.84<|r1/f| (1)
1.0<f1/f (2)
f1/f<−5.0 (3)
−0.40<(r3+r4)/(r3−r4)<0.90 (4)
0.8<|f4/f| (5)
50<νd1<80 (6)
50<νd2<80 (7)
20<νd3<30 (8)
20<νd4<30 (9)
50<νd4<60 (9-1)
50<νd5<80 (10)
20<νd5<60 (10-1)
50<νd6<80 (11)
20<νd6<60 (11-1)
0.8<ih/f<1.1 (12)
−1.7<f2/f3<−0.5 (13)
−2.3<f5/f6<−0.6 (14)
where

(46) f: focal length of the overall optical system of the imaging lens

(47) f1: focal length of the first lens L1

(48) f2: focal length of the second lens L2

(49) f3: focal length of the third lens L3

(50) f4: focal length of the fourth lens L4

(51) f5: focal length of the fifth lens L5

(52) f6: focal length of the sixth lens L6

(53) r1: curvature radius of the object-side surface of the first lens L1

(54) r3: curvature radius of the object-side surface of the second lens L2

(55) r4: curvature radius of the image-side surface of the second lens L2

(56) vd1: Abbe number of the first lens L1 at d-ray

(57) vd2: Abbe number of the second lens L2 at d-ray

(58) vd3: Abbe number of the third lens L3 at d-ray

(59) vd4: Abbe number of the fourth lens L4 at d-ray

(60) vd5: Abbe number of the fifth lens L5 at d-ray

(61) vd6: Abbe number of the sixth lens L6 at d-ray

(62) ih: maximum image height.

(63) When the imaging lens according to this embodiment satisfies conditional expressions (1a) to (14a) below, it brings about more advantageous effects:
0.84≦|r1/f| (1a)
1.2<f1/f (2a)
f1/f<−7.0 (3a)
−0.40<(r3+r4)/(r3−r4)<0.85 (4a)
1.0<|f4/f| (5a)
50<νd1<65 (6a)
50<νd2<65 (7a)
20<νd3<28 (8a)
20<νd4<28 (9a)
52<νd4<58 (9-1a)
50<νd5<65 (10a)
20<νd5<58 (10-1a)
50<νd6<65 (11a)
20<νd6<58 (11-1a)
0.85<ih/f<1.1 (12a)
−1.68<f2/f3<−0.5 (13a)
−2.2<f5/f6<−0.70 (14a)
The signs in the above conditional expressions have the same meanings as those in the preceding paragraph.

(64) When the imaging lens according to this embodiment satisfies conditional expressions (1b) to (14b) below, it brings about particularly advantageous effects:
0.85≦|r1/f| (1b)
1.25≦f1/f (2b)
f1/f≦−7.8 (3b)
−0.39≦(r3+r4)/(r3−r4)30.83 (4b)
1.0≦|f4/f| (5b)
50<νd1<60 (6b)
50<νd2<60 (7b)
22<νd3<28 (8b)
22<νd4<28 (9b)
54<νd4<58 (9-1b)
50<νd5<60 (10b)
22<νd5<58 (10-1b)
50<νd6<60 (11b)
22<νd6<58 (11-1b)
0.86≦ih/f≦1.0 (12b)
−1.66≦f2/f3≦−0.52 (13b)
−2.1≦f5/f6≦−0.7 (14b)
The signs in the above conditional expressions have the same meanings as those in the paragraph before the preceding paragraph.

(65) In this embodiment, the aspheric shapes of the lens surfaces are expressed by Equation 1, where Z denotes an axis in the optical axis direction, H denotes a height perpendicular to the optical axis, k denotes a conic constant, and A4, A6, A8, A10, A12, A14, and A16 denote aspheric surface coefficients.

(66) $\begin{matrix} Z = \frac{\frac{H^{2}}{R}}{1 + \sqrt{1 - (k + 1) \frac{H^{2}}{R^{2}}}} + A_{4} H^{4} + A_{6} H^{6} + A_{8} H^{8} + A_{10} H^{10} + A_{12} H^{12} + A_{14} H^{14} + A_{16} H^{16} & Equation 1 \end{matrix}$

(67) Next, Examples of the imaging lens according to this embodiment will be explained. In each example, f denotes the focal length of the overall optical system of the imaging lens, Fno denotes an F-number, ω denotes a half field of view, and ih denotes maximum image height. i denotes a surface number counted from the object side, r denotes a curvature radius, d denotes the distance on the optical axis between lens surfaces (axial surface distance), Nd denotes a refractive index at d-ray (reference wavelength), and νd denotes an Abbe number at d-ray. As for aspheric surfaces, an asterisk (*) after surface number i indicates that the surface concerned is an aspheric surface.

EXAMPLE 1

(68) The basic lens data is shown below in Table 1.

(69) TABLE-US-00001 TABLE 1 Numerical Data Example 1 Unit mm f = 6.787 Fno = 2.40 ω(°) = 41.2 ih = 5.980 Surface Data Surface Curvature Surface Refractive Abbe Number i Radius r Distance d Index Nd Number vd (Object) Infinity Infinity 1* −124.740 1.501 1.5438 55.57 2* −10.827 0.276 3(Stop) Infinity −0.036 4* 5.966 0.948 1.5438 55.57 5* −6.359 0.073 6* 10.079 0.600 1.6142 25.58 7* 3.000 0.834 8* 11.941 0.700 1.6142 25.58 9* 6.908 0.487 10* −23.730 1.640 1.5346 56.16 11* −1.971 0.523 12* −31.902 1.145 1.5346 56.16 13* 2.300 1.300 14 Infinity 0.300 1.5670 37.80 15 Infinity 0.260 Image Plane Infinity Constituent Lens Data Lens Start Surface Focal Length 1 1 21.700 2 4 5.818 3 6 −7.186 4 8 −28.179 5 10 3.917 6 12 −3.967 Aspheric Surface Data 1st Surface 2nd Surface 4th Surface 5th Surface 6th Surface 7th Surface k 0.000E+00 0.000E+00 −2.812E+00 8.606E+00 0.000E+00 −4.136E+00 A4 −3.733E−03 2.693E−03 5.451E−03 1.323E−02 −4.971E−03 −2.875E−03 A6 1.132E−04 −6.532E−04 −1.799E−03 −7.707E−03 −9.176E−04 5.801E−03 A8 1.480E−05 2.544E−04 8.832E−05 1.901E−03 −8.682E−04 −2.407E−03 A10 0.000E+00 0.000E+00 3.312E−05 −5.900E−05 5.769E−04 4.991E−04 A12 0.000E+00 0.000E+00 0.000E+00 0.000E+00 −7.352E−05 −3.913E−05 A14 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 A16 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 8th Surface 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface k 0.000E+00 0.000E+00 0.000E+00 −3.420E+00 0.000E+00 −6.130E+00 M −2.279E−02 −1.817E−02 2.155E−03 −1.403E−02 −1.110E−02 −8.915E−03 A6 6.271E−04 1.683E−04 −1.314E−04 3.362E−03 8.831E−04 9.295E−04 A8 8.846E−04 1.958E−04 −2.682E−04 −5.815E−04 −1.567E−05 −7.617E−05 A10 −1.351E−04 −1.229E−05 6.259E−05 8.530E−05 3.531E−08 3.601E−06 A12 3.432E−06 1.109E−07 −4.129E−06 −4.867E−06 −4.004E−08 −8.993E−08 A14 0.000E+00 0.000E+00 0.000E+00 −7.135E−08 2.180E−09 9.318E−10 A16 0.000E+00 0.000E+00 0.000E+00 9.809E−09 −3.098E−11 0.000E+00

(70) According to the imaging lens in Example 1, the first lens L1 has positive refractive power, and as shown in Table 17, the imaging lens satisfies all of conditional expressions (1) and (2), and conditional expressions (4) to (14).

(71) FIG. 2 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 1. The spherical aberration diagram shows the amount of aberration at wavelengths of F-ray (486 nm), d-ray (588 nm), and C-ray (656 nm). The astigmatism diagram shows the amount of aberration at d-ray on sagittal image surface S and the amount of aberration at d-ray on tangential image surface T (the same is true for FIGS. 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, and 32). As shown in FIG. 2, each aberration is corrected properly.

(72) Also, an imaging lens system achieving a wide field of view of about 82 degrees and high brightness with an F-value of about 2.4 is provided. Additionally, a ratio of total track length TTL to twice the maximum image height ih (TTL/2ih) is about 0.87, and compactness of the imaging lens is achieved though the imaging lens is composed of six constituent lenses.

EXAMPLE 2

(73) The basic lens data is shown below in Table 2.

(74) TABLE-US-00002 TABLE 2 Numerical Data Example 2 Unit mm f = 6.800 Fno = 2.42 ω(°) = 41.2 ih = 5.980 Surface Data Surface Curvature Surface Refractive Abbe Number i Radius r Distance d Index Nd Number vd (Object) Infinity Infinity 1* −50.126 1.500 1.5438 55.57 2* −8.974 0.102 3(Stop) Infinity 0.020 4* 5.829 1.019 1.5438 55.57 5* −6.607 0.047 6* 11.044 0.600 1.6142 25.58 7* 3.000 0.789 8* 7.133 0.700 1.6142 25.58 9* 7.385 0.673 10* −7.394 1.429 1.5346 56.16 11* −1.915 0.411 12* −33.289 1.210 1.5346 56.16 13* 2.300 1.300 14 Infinity 0.300 1.5670 37.80 15 Infinity 0.218 Image Plane Infinity Constituent Lens Data Lens Start Surface Focal Length 1 1 19.845 2 4 5.864 3 6 −6.902 4 8 165.588 5 10 4.431 6 12 −3.977 Aspheric Surface Data 1st Surface 2nd Surface 4th Surface 5th Surface 6th Surface 7th Surface k 0.000E+00 0.000E−F00 −2.289E+00 1.024E+01 0.000E+00 −4.356E+00 A4 −4.117E−03 5.348E−03 5.281E−03 1.203E−02 −6.103E−04 −3.939E−04 A6 4.101E−04 −6.057E−04 −2.220E−03 −7.931E−03 −6.631E−04 5.962E−03 A8 5.759E−06 3.759E−04 2.958E−04 2.046E−03 −8.065E−04 −2.353E−03 A10 0.000E+00 0.000E+00 1.957E−05 −5.194E−05 5.752E−04 4.983E−04 A12 0.000E+00 0.000E+00 0.000E+00 0.000E+00 −8.111E−05 −4.198E−05 A14 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 A16 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 8th Surface 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface k 0.000E+00 0.000E+00 0.000E+00 −3.148E+00 0.000E+00 −6.306E+00 A4 −1.709E−02 −9.388E−03 2.684E−03 −1.217E−02 −1.090E−02 −9.185E−03 A6 −2.605E−04 −9.784E−04 7.128E−04 2.882E−03 8.759E−04 9.334E−04 A8 5.093E−04 2.962E−04 −3.750E−04 −5404E−04 −1.616E−05 −7.614E−05 A10 −4.139E−05 −1.865E−05 6.468E−05 8132E−05 4.341E−08 3.576E−06 A12 −3.951E−06 −1.280E−07 −3.906E−06 −5.142E−06 −3.986E−08 −8.935E−08 A14 0.000E+00 0.000E+00 0.000E+00 −9.543E−08 2.190E−09 9.327E−10 A16 0.000E+00 0.000E+00 0.000E+00 1.215E−08 −3.127E−11 0.000E+00

(75) According to the imaging lens in Example 2, the first lens L1 has positive refractive power, and as shown in Table 17, the imaging lens satisfies all of conditional expressions (1) and (2), and conditional expressions (4) to (14).

(76) FIG. 4 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 2. As shown in FIG. 4, each aberration is corrected properly.

(77) Also, an imaging lens system achieving a wide field of view of about 82 degrees and high brightness with an F-value of about 2.4 is provided. Additionally, a ratio of total track length TTL to twice the maximum image height ih (TTL/2ih) is about 0.85, and compactness of the imaging lens is achieved though the imaging lens is composed of six constituent lenses.

EXAMPLES 3

(78) The basic lens data is shown below in Table 3.

(79) TABLE-US-00003 TABLE 3 Numerical Data Example 3 Unit mm f = 6.805 Fno = 2.44 ω(°) = 41.2 ih = 5.980 Surface Data Surface Curvature Surface Refractive Abbe Number i Radius r Distance d Index Nd Number vd (Object) Infinity Infinity 1* −300.000 1.500 1.5438 55.57 2* −4.578 0.100 3(Stop) Infinity 0.106 4* 66.236 0.866 1.5438 55.57 5* −6.072 0.040 6* 9.530 0.600 1.6142 25.58 7* 3.046 0.874 8* 8.116 0.700 1.6142 25.58 9* 6.300 0.509 10* −14.450 1.624 1.5346 56.16 11* −1.955 0.518 12* −30.320 1.120 1.5346 56.16 13* 2.300 1.300 14 Infinity 0.300 1.5670 37.80 15 Infinity 0.258 Image Plane Infinity Constituent Lens Data Lens Start Surface Focal Length 1 1 8.533 2 4 10.272 3 6 −7.554 4 8 −53.713 5 10 4.045 6 12 −3.952 Aspheric Surface Data 1st Surface 2nd Surface 4th Surface 5th Surface 6th Surface 7th Surface k 0.000E+00 0.000E+00 9.900E+01 8.917E+00 0.000E+00 −2.635E+00 A4 −5.710E−03 1.722E−02 1.307E−02 5.277E−03 −1.627E−03 −4.199E−03 A6 3.122E−04 −3.538E−03 −5.675E−03 −6.442E−03 −1.321E−03 5.108E−03 A8 3.423E−05 6.446E−04 8.075E−04 1.844E−03 −8.583E−04 −2.301E−03 A10 0.000E+00 0.000E+00 −9.706E−05 −1.060E−04 6.041E−04 5.242E−04 A12 0.000E+00 0.000E+00 0.000E+00 0.000E+00 −8.317E−05 −4.585E−05 A14 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 A16 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 8th Surface 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface k 0.000E+00 0.000E+00 0.000E+00 −3.259E+00 0.000E+00 −6.036E+00 A4 −1.962E−02 −1.477E−02 1.872E−03 −1.350E−02 −1.114E−02 −8.849E−03 A6 7.366E−05 −1.939E−04 2.391E−04 2.921E−03 8.816E−04 9.264E−04 A8 7.340E−04 2.086E−04 −2.796E−04 −5.382E−04 −1.528E−05 −7.625E−05 A10 −1.023E−04 −1.163E−05 5.937E−05 8.817E−05 4.032E−08 3.597E−06 A12 3.112E−06 −1.405E−07 −3.910E−06 −5.129E−06 −4.031E−08 −8.904E−08 A14 0.000E+00 0.000E+00 0.000E+00 −1.003E−07 2.154E−09 9.130E−10 A16 0.000E+00 0.000E+00 0.000E+00 1.194E−08 −3.030E−11 0.000E+00

(80) According to the imaging lens in Example 3, the first lens L1 has positive refractive power, and as shown in Table 17, satisfies all of conditional expressions (1) and (2), and conditional expressions (4) to (14).

(81) FIG. 6 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 3. As shown in FIG. 6, each aberration is corrected properly.

(82) Also, an imaging lens system achieving a wide field of view of about 82 degrees and high brightness with an F-value of about 2.4 is provided. Additionally, a ratio of total track length TTL to twice the maximum image height ih (TTL/2ih) is about 0.86, and compactness of the imaging lens is achieved though the imaging lens is composed of six constituent lenses.

EXAMPLE 4

(83) The basic lens data is shown below in Table 4.

(84) TABLE-US-00004 TABLE 4 Numerical Data Example 4 Unit mm f = 6.776 Fno = 245 ω(°) = 41.3 ih = 5.980 Surface Data Surface Curvature Surface Refractive Abbe Number i Radius r Distance d Index Nd Number vd (Object) Infinity Infinity 1* −280.675 1.373 1.5438 55.57 2* −11.717 0.231 3(Stop) Infinity 0.113 4* 11.876 1.086 1.5438 55.57 5* −4.375 0.040 6* 7.551 0.600 1.6142 25.58 7* 3.349 1.164 8* −5.264 0.700 1.6142 25.58 9* 25.631 0.118 10* 27.285 1.880 1.5346 56.16 11* −1.915 0.705 12* 20.516 0.950 1.5346 56.16 13* 2.097 1.300 14 Infinity 0.300 1.5670 37.80 15 Infinity 0.260 Image Plane Infinity Constituent Lens Data Lens Start Surface Focal Length 1 1 22.444 2 4 6.021 3 6 −10.361 4 8 −7.049 5 10 3.424 6 12 −4.449 Aspheric Surface Data 1st Surface 2nd Surface 4th Surface 5th Surface 6th Surface 7th Surface k 0.000E+00 0.000E+00 6.900E−01 3.341E+00 0.000E+00 −4.982E+00 A4 −4.830E−03 2.692E−03 6.666E−03 1.598E−02 −1.245E−02 −1.017E−02 A6 2.318E−04 −8.471E−05 −1.511E−03 −7.374E−03 −3.020E−04 4.467E−03 A8 −5.473E−06 9.967E−05 3.054E−04 1.836E−03 −1.349E−03 −2.378E−03 A10 0.000E+00 0.000E+00 −1.955E−04 −2.417E−04 4.384E−04 4.997E−04 A12 0.000E+00 0.000E+00 0.000E+00 0.000E+00 −4.986E−05 −5.187E−05 A14 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 A16 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 8th Surface 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface k 0.000E+00 0.000E+00 0.000E+00 −2.999E+00 0.000E+00 −4.621E+00 A4 −1.718E−02 −1.944E−02 −9.262E−03 −1.446E−02 −1.116E−02 −9.260E−03 A6 −8.549E−04 2.333E−04 2.314E−04 3.133E−03 8.140E−04 9.985E−04 A8 8.395E−04 5.726E−05 −1.765E−04 −5.899E−04 −1.782E−05 −7.686E−05 A10 −1.324E−04 −8.707E−06 5.809E−05 8.688E−05 3.679E−08 3.571E−06 A12 3.130E−06 3.186E−06 −4.349E−06 −4.779E−06 −3.628E−08 −8.915E−08 A14 0.000E+00 0.000E+00 0.000E+00 −7.517E−08 2.337E−09 8.990E−10 A16 0.000E+00 0.000E+00 0.000E+00 9.253E−09 −3.692E−11 0.000E+00

(85) According to the imaging lens in Example 4, the first lens L1 has positive refractive power, and as shown in Table 17, the imaging lens satisfies all of conditional expressions (1) and (2), and conditional expressions (4) to (14).

(86) FIG. 8 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 4. As shown in FIG. 8, each aberration is corrected properly.

(87) Also, an imaging lens system achieving a wide field of view of about 82 degrees and high brightness with an F-value of about 2.5 is provided. Additionally, a ratio of total track length TTL to twice the maximum image height ih (TTL/2ih) is about 0.91, and compactness of the imaging lens is achieved though the imaging lens is composed of six constituent lenses.

EXAMPLE 5

(88) The basic lens data is shown below in Table 5.

(89) TABLE-US-00005 TABLE 5 Numerical Data Example 5 Unit mm f = 6.781 Fno = 2.46 ω(°) = 41.3 ih = 5.980 Surface Data Surface Curvature Surface Refractive Abbe Number i Radius r Distance d Index Nd Number vd (Object) Infinity Infinity 1* −248.941 1.481 1.5438 55.57 2* −23.657 0.370 3(Stop) Infinity 0.055 4* 7.471 1.113 1.5438 55.57 5* −4.713 0.040 6* 6.329 0.606 1.6142 25.58 7* 3.000 1.120 8* −8.108 0.700 1.6142 25.58 9* 17.701 0.195 10* −35.000 1.772 1.5346 56.16 11* −1.915 0.902 12* 32.003 0.950 1.5346 56.16 13* 2.300 1.300 14 Infinity 0.300 1.5670 37.80 15 Infinity 0.335 Image Plane Infinity Constituent Lens Data Lens Start Surface Focal Length 1 1 47.958 2 4 5.491 3 6 −9.977 4 8 −8.961 5 10 3.720 6 12 −4.687 Aspheric Surface Data 1st Surface 2nd Surface 4th Surface 5th Surface 6th Surface 7th Surface k 0.000E+00 0.000E+00 1.011E+00 3.907E+00 0.000E+00 −4.980E+00 A4 −3.392E−03 1.717E−03 7.227E−03 1.836E−02 −1.569E−02 −9.296E−03 A6 3.309E−05 −4.359E−04 −1.705E−03 −7.840E−03 −5.368E−04 4.460E−03 A8 7.116E−06 1.704E−04 4.264E−04 1.822E−03 −1.383E−03 −2.350E−03 A10 0.000E+00 0.000E+00 −1.233E−04 −1.749E−04 4.016E−04 4.838E−04 A12 0.000E+00 0.000E+00 0.000E+00 0.000E+00 −3.957E−05 −4.444E−05 A14 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 A16 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 8th Surface 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface k 0.000E+00 0.000E+00 0.000E+00 −2.930E+00 0.000E+00 −5.110E+00 A4 −2.432E−02 −1.763E−02 9.310E−04 −1.661E−02 −1.048E−02 −9.167E−03 A6 −9.833E−05 2.120E−04 −7.926E−04 3.287E−03 7.338E−04 9.661E−04 A8 1.089E−03 9.477E−06 −1.930E−04 −5.536E−04 −1.602E−05 −7.557E−05 A10 −1.292E−04 −1.300E−05 6.489E−05 8.704E−05 1.182E−07 3.561E−06 A12 −1.395E−06 3.858E−06 −4.362E−06 −5.056E−06 −3.665E−08 −9.042E−08 A14 0.000E+00 0.000E+00 0.000E+00 −8.900E−08 2.222E−09 9.343E−10 A16 0.000E+00 0.000E+00 0.000E+00 1.121E−08 −3.549E−11 0.000E+00

(90) According to the imaging lens in Example 5, the first lens L1 has positive refractive power, and as shown in Table 17, the imaging lens satisfies all of conditional expressions (1) and (2), and conditional expressions (4) to (14).

(91) FIG. 10 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 5. As shown in FIG. 10, each aberration is corrected properly.

(92) Also, an imaging lens system achieving a wide field of view of about 82 degrees and high brightness with an F-value of about 2.5 is provided. Additionally, a ratio of total track length TTL to twice the maximum image height ih (TTL/2ih) is about 0.93, and compactness of the imaging lens is achieved though the imaging lens is composed of six constituent lenses.

EXAMPLE 6

(93) The basic lens data is shown below in Table 6.

(94) TABLE-US-00006 TABLE 6 Numerical Data Example 6 Unit mm f = 3.449 Fno = 2.24 ω(°) = 45.0 ih = 3.470 Surface Data Surface Curvature Surface Refractive Abbe Number i Radius r Distance d Index Nd Number vd (Object) Infinity Infinity 1* −9.080 0.500 1.5438 55.57 2* −3.940 0.023 3(Stop) Infinity 0.017 4* 7.354 0.585 1.5438 55.57 5* −2.843 0.020 6* 2.974 0.300 1.6349 23.97 7* 1.507 0.445 8* 5.286 0.380 1.6349 23.97 9* 3.746 0.219 10* −4.707 0.950 1.5346 56.16 11* −0.984 0.080 12* 3.623 0.630 1.5346 56.16 13* 0.950 0.600 14 Infinity 0.210 1.5168 64.20 15 Infinity 0.576 Image Plane Infinity Constituent Lens Data Lens Start Surface Focal Length 1 1 12.372 2 4 3.848 3 6 −5.224 4 8 −22.412 5 10 2.138 6 12 −2.624 Aspheric Surface Data 1st Surface 2nd Surface 4th Surface 5th Surface 6th Surface 7th Surface k 0.000E+00 0.000E+00 0.000E+00 5.005E+00 0.000E+00 −3.256E+00 A4 −4.258E−02 3.477E−02 3.822E−02 2.885E−02 −8.017E−02 −3.089E−02 A6 1.988E−02 −2.175E−02 −8.346E−02 −1.003E−01 −2.370E−03 6.957E−02 A8 −2.546E−03 2.808E−02 4.646E−02 8.788E−02 −2.737E−02 −9.219E−02 A10 0.000E+00 0.000E+00 −2.466E−02 −1.990E−02 6.448E−02 6.386E−02 A12 0.000E+00 0.000E+00 0.000E+00 0.000E+00 −2.433E−02 −1.598E−02 A14 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 A16 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 8th Surface 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface k 0.000E+00 0.000E+00 0.000E+00 −3.537E+00 0.000E+00 −4.723E+00 A4 −9.818E−02 −7.148E−02 5.431E−02 −8.332E−02 −8.400E−02 −4.341E−02 A6 1.844E−02 1.222E−02 4.661E−04 5.415E−02 1.216E−02 1.115E−02 A8 4.098E−02 3.628E−03 −1.361E−02 −2.359E−02 −6.086E−04 −2.597E−03 A10 −2.547E−02 −1.242E−03 6.836E−03 1.027E−02 3.063E−05 3.929E−04 A12 4.259E−03 2.470E−05 −9.821E−04 −1.633E−03 −1.139E−05 −3.280E−05 A14 0.000E+00 0.000E+00 0.000E+00 −8.706E−05 1.948E−06 1.112E−06 A16 0.000E+00 0.000E+00 0.000E+00 2.771E−05 −1.263E−07 0.000E+00

(95) According to the imaging lens in Example 6, the first lens L1 has positive refractive power, and as shown in Table 17, the imaging lens satisfies all of conditional expressions (1) and (2), and conditional expressions (4) to (14).

(96) FIG. 12 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 6. Even when the imaging lens is applied to a compact imaging sensor as Example 6, as shown in FIG. 12, each aberration is corrected properly.

(97) Also, an imaging lens system achieving a wide field of view of about 90 degrees and high brightness with an F-value of about 2.2 is provided. Additionally, a ratio of total track length TTL to twice the maximum image height ih (TTL/2ih) is about 0.79, and compactness of the imaging lens is achieved though the imaging lens is composed of six constituent lenses.

EXAMPLE 7

(98) The basic lens data is shown below in Table 7.

(99) TABLE-US-00007 TABLE 7 Numerical Data Example 7 Unit mm f = 3.057 Fno = 2.21 ω(°) = 43.7 ih = 2.934 Surface Data Surface Curvature Surface Refractive Abbe Number i Radius r Distance d Index Nd Number vd (Object) Infinity Infinity 1* −7.778 0.419 1.5438 55.57 2* −3.966 0.063 3(Stop) Infinity −0.021 4* 4.660 0.530 1.5438 55.57 5* −2.607 0.020 6* 2.678 0.280 1.6349 23.97 7* 1.305 0.376 8* 3.858 0.330 1.6349 23.97 9* 2.969 0.204 10* −3.950 0.810 1.5346 56.16 11* −0.829 0.040 12* 3.170 0.544 1.5346 56.16 13* 0.800 0.600 14 Infinity 0.210 1.5168 64.20 15 Infinity 0.442 Image Plane Infinity Constituent Lens Data Lens Start Surface Focal Length 1 1 14.326 2 4 3.155 3 6 −4.354 4 8 −23.711 5 10 1.799 6 12 −2.176 Aspheric Surface Data 1st Surface 2nd Surface 4th Surface 5th Surface 6th Surface 7th Surface k 0.000E+00 0.000E+00 0.000E+00 5.347E+00 0.000E+00 −3.200E+00 A4 −6.049E−02 5.188E−02 7.330E−02 4.688E−02 −1.270E−01 −4.689E−02 A6 4.012E−02 −5.692E−02 −1.868E−01 −2.166E−01 −1.469E−02 1.525E−01 A8 −7.967E−03 8.272E−02 1.472E−01 2.501E−01 −8.568E−02 −2.825E−01 A10 0.000E+00 0.000E+00 −8.557E−02 −7.620E−02 2.791E−01 2.719E−01 A12 0.000E+00 0.000E+00 0.000E+00 0.000E+00 −1.411E−01 −9.551E−02 A14 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 A16 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 8th Surface 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface k 0.000E+00 0.000E+00 0.000E+00 −3.588E+00 0.000E+00 −4.866E+00 A4 −1.515E−01 −1.171E−01 8.962E−02 −1.249E−01 −1.304E−01 −7.240E−02 A6 3.233E−02 2.544E−02 7.062E−04 1.184E−01 2.693E−02 2.626E−02 A8 1.235E−01 1.067E−02 −4.232E−02 −7.326E−02 −1.936E−03 −8.132E−03 A10 −1.066E−01 −5.353E−03 2.859E−02 4.326E−02 1.247E−04 1.645E−03 A12 2.510E−02 −2.398E−04 −5.762E−03 −9.553E−03 −6.613E−05 −1.892E−04 A14 0.000E+00 0.000E+00 0.000E+00 −7.067E−04 1.617E−05 9.210E−06 A16 0.000E+00 0.000E+00 0.000E+00 3.237E−04 −1.479E−06 0.000E+00

(100) According to the imaging lens in Example 7, the first lens L1 has positive refractive power, and as shown in Table 17, the imaging lens satisfies all of conditional expressions (1) and (2), and conditional expressions (4) to (14).

(101) FIG. 14 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 7. Even when the imaging lens is applied to a contact imaging sensor as Example 7, as shown in FIG. 14, each aberration is corrected properly.

(102) Also, an imaging lens system achieving a wide field of view of about 87 degrees and high brightness with an F-value of about 2.2 is provided. Additionally, a ratio of total track length TTL to twice the maximum image height ih (TTL/2ih) is about 0.81, and compactness of the imaging lens is achieved though the imaging lens is composed of six constituent lenses.

EXAMPLE 8

(103) The basic lens data is shown below in Table 8.

(104) TABLE-US-00008 TABLE 8 Numerical Data Example 8 Unit mm f = 6.492 Fno = 2.30 ω(°) = 42.5 ih = 5.980 Surface Data Surface Curvature Surface Refractive Abbe Number i Radius r Distance d Index Nd Number vd (Object) Infinity Infinity 1* −121.481 1.498 1.5438 55.57 2* −10.738 0.050 3(Stop) Infinity 0.020 4* 5.787 1.069 1.5438 55.57 5* −6.075 0.071 6* 7.376 0.500 1.6349 23.97 7* 2.795 0.822 8* 23.065 0.624 1.6349 23.97 9* 12.062 0.457 10* −9.734 1.374 1.5346 56.16 11* −1.915 0.614 12* 656.055 0.980 1.5346 56.16 13* 2.145 1.000 14 Infinity 0.300 1.5168 64.20 15 Infinity 0.525 Image Plane Infinity Constituent Lens Data Lens Start Surface Focal Length 1 1 21.557 2 4 5.629 3 6 −7.403 4 8 −40.721 5 10 4.202 6 12 −4.027 Aspheric Surface Data 1st Surface 2nd Surface 4th Surface 5th Surface 6th Surface 7th Surface k 0.000E+00 0.000E+00 −4.119E−01 7.182E+00 0.000E+00 −3.898E+00 A4 −5.512E−03 3.944E−03 6.709E−03 1.294E−02 −9.917E−03 −3.701E−03 A6 4.993E−04 −1.770E−04 −1.463E−03 −7.818E−03 −3.025E−04 5.578E−03 A8 −1.992E−05 1.572E−04 2.364E−04 2.106E−03 −1.057E−03 −2.371E−03 A10 0.000E+00 0.000E+00 −8.650E−05 −2.137E−04 5.066E−04 5.268E−04 A12 0.000E+00 0.000E+00 0.000E+00 0.000E+00 −5.669E−05 −4.496E−05 A14 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 A16 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 8th Surface 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface k 0.000E+00 0.000E+00 0.000E+00 −3.306E+00 0.000E+00 −5.672E+00 A4 −1.940E−02 −1.611E−02 1.342E−03 −1.329E−02 −1.186E−02 −9.221E−03 A6 8.988E−04 1.714E−04 −1.961E−04 3.189E−03 8.617E−04 9.387E−04 A8 8.515E−04 2.262E−04 −2.509E−04 −5.550E−04 −1.559E−05 −7.460E−05 A10 −1.447E−04 −9.236E−06 6.816E−05 8.673E−05 6.579E−08 3.530E−06 A12 4.245E−06 −1.041E−06 −5.172E−06 −5.194E−06 −3.940E−08 −9.134E−08 A14 0.000E+00 0.000E+00 0.000E+00 −1.005E−07 2.195E−09 9.866E−10 A16 0.000E+00 0.000E+00 0.000E+00 1.288E−08 −3.268E−11 0.000E+00

(105) According to the imaging lens in Example 8, the first lens L1 has positive refractive power, and as shown in Table 17, the imaging lens satisfies all of conditional expressions (1) and (2), and conditional expressions (4) to (14).

(106) FIG. 16 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 8. As shown in FIG. 16, each aberration is corrected properly.

(107) Also, an imaging lens system achieving a wide field of view of about 85 degrees and high brightness with an F-value of about 2.3 is provided. Additionally, a ratio of total track length TTL to twice the maximum image height ih (TTL/2ih) is about 0.82, and compactness of the imaging lens is achieved though the imaging lens is composed of six constituent lenses.

EXAMPLE 9

(108) The basic lens data is shown below in Table 9.

(109) TABLE-US-00009 TABLE 9 Numerical Data Example 9 Unit mm f = 6.685 Fno = 2.40 ω(°) = 41.5 ih = 5.980 Surface Data Surface Curvature Surface Refractive Abbe Number i Radius r Distance d Index Nd Number vd (Object) Infinity Infinity 1* −19.540 1.250 1.5438 55.57 2* −21.941 0.371 3(Stop) Infinity −0.120 4* 5.856 0.978 1.5438 55.57 5* −5.854 0.372 6* 15.430 0.530 1.6349 23.97 7* 3.500 0.471 8* 5.573 0.610 1.5346 56.16 9* 15.367 0.903 10* −3.175 1.397 1.5346 56.16 11* −2.001 0.080 12* 6.898 1.889 1.5346 56.16 13* 2.300 1.300 14 Infinity 0.300 1.5670 37.80 15 Infinity 0.672 Image Plane Infinity Constituent Lens Data Lens Start Surface Focal Length 1 1 −402.121 2 4 5.546 3 6 −7.255 4 8 16.009 5 10 7.155 6 12 −7.532 Aspheric Surface Data 1st Surface 2nd Surface 4th Surface 5th Surface 6th Surface 7th Surface k 0.000E+00 0.000E−F00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 A4 −5.974E−04 5.114E−03 1.290E−05 −1.257E−05 −4.890E−03 −1.782E−02 A6 1.203E−05 −1.456E−03 −3.931E−03 −3.741E−03 1.004E−03 5.336E−03 A8 6.170E−06 4.042E−04 7.606E−04 6.957E−04 −2.249E−05 −1.158E−03 A10 0.000E+00 0.000E+00 −1.127E−04 −7.286E−05 2.790E−05 9.874E−05 A12 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 A14 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 A16 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 8th Surface 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface k 0.000E+00 0.000E+00 0.000E+00 −2.238E+00 0.000E+00 −5.091E+00 A4 −1.191E−02 −1.199E−03 1.403E−02 −7.112E−03 −1.358E−02 −6.343E−03 A6 −1.045E−04 −1.103E−03 1.664E−04 7.637E−04 9.039E−04 4.707E−04 A8 1.854E−04 1.201E−04 1.351E−04 8.531E−05 −1.517E−05 −2.652E−05 A10 −2.064E−05 9.121E−06 −1.018E−05 1.001E−06 −4.125E−06 8.360E−07 A12 0.000E+00 0.000E+00 0.000E+00 −8.131E−07 2.944E−07 −1.546E−08 A14 0.000E+00 0.000E+00 0.000E+00 0.000E+00 −2.973E−09 1.423E−10 A16 0.000E+00 0.000E+00 0.000E+00 0.000E+00 −1.458E−10 0.000E+00

(110) According to the imaging lens in Example 8, the first lens L1 has negative refractive power, and as shown in Table 17, the imaging lens satisfies all of conditional expressions (1) and (3), conditional expressions (4) to (8), conditional expression (9-1), conditional expression (10-1), conditional expression (11-1), and conditional expressions (12) to (14).

(111) FIG. 18 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 9. As shown in FIG. 18, each aberration is corrected properly.

(112) Also, an imaging lens system achieving a wide field of view of about 83 degrees and high brightness with an F-value of about 2.4 is provided. Additionally, a ratio of total track length TTL to twice the maximum image height ih (TTL/2ih) is about 0.91, and compactness of the imaging lens is achieved though the imaging lens is composed of six constituent lenses.

EXAMPLE 10

(113) The basic lens data is shown below in Table 10.

(114) TABLE-US-00010 TABLE 10 Numerical Data Example 10 Unit mm f = 6.788 Fno = 2.41 ω(°) = 41.2 ih = 5.980 Surface Data Surface Curvature Surface Refractive Abbe Number i Radius r Distance d Index Nd Number vd (Object) Infinity Infinity 1* 22.990 0.480 1.5438 55.57 2* 12.703 0.382 3* 3.883 1.061 1.5438 55.57 4* −5.988 −0.098 5(Stop) Infinity 0.182 6* 6.184 0.480 1.6349 23.97 7* 2.540 0.967 8* 6.865 0.603 1.5346 56.16 9* 6.751 0.614 10* −11.813 1.404 1.5346 56.16 11* −1.934 0.514 12* 200.000 0.990 1.5346 56.16 13* 2.082 0.700 14 Infinity 0.300 1.5670 37.80 15 Infinity 1.035 Image Plane Infinity Constituent Lens Data Lens Start Surface Focal Length 1 1 −53.077 2 3 4.502 3 6 −7.155 4 8 898.534 5 10 4.121 6 12 −3.942 Aspheric Surface Data 1st Surface 2nd Surface 3rd Surface 4th Surface 6th Surface 7th Surface k 0.000E+00 0.000E+00 −2.112E+00 2.494E+00 0.000E+00 −5.961E+00 A4 −2.551E−03 2.856E−04 5.801E−03 1.944E−02 −1.484E−02 3.120E−03 A6 2.643E−04 1.237E−04 −3.784E−04 −8.731E−03 4.760E−03 5.392E−03 A8 −5.843E−05 −2.392E−05 −2.656E−04 2.457E−03 −1.640E−03 −2.763E−03 A10 0.000E+00 0.000E+00 7.712E−05 −2.706E−04 2.789E−04 7.058E−04 A12 0.000E+00 0.000E+00 0.000E+00 0.000E+00 1.831E−05 −4.676E−05 A14 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 A16 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 8th Surface 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface k 0.000E+00 0.000E+00 0.000E+00 −3.718E+00 0.000E+00 −5.994E+00 A4 −1.762E−02 −1.362E−02 3.006E−03 −1.242E−02 −1.250E−02 −9.937E−03 A6 6.790E−04 −2.879E−04 8.973E−05 3.382E−03 9.237E−04 9.963E−04 A8 6.470E−04 2.145E−04 −3.493E−04 −6.125E−04 −1.580E−05 −7.818E−05 A10 −1.330E−04 −1.393E−05 6.337E−05 8.603E−05 1.965E−08 3.591E−06 A12 8.190E−06 1.323E−07 −3.514E−06 −4.785E−06 −4.039E−08 −8.824E−08 A14 0.000E+00 0.000E+00 0.000E+00 −6.993E−08 2.202E−09 9.126E−10 A16 0.000E+00 0.000E+00 0.000E+00 9.925E−09 −3.111E−11 0.000E+00

(115) According to the imaging lens in Example 10, the first lens L1 has negative refractive power, and as shown in Table 17, the imaging lens satisfies all of conditional expressions (1) and (3), conditional expressions (4) to (8), conditional expression (9-1), conditional expression (10-1), conditional expression (11-1), and conditional expressions (12) to (14).

(116) FIG. 20 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 10. As shown in FIG. 20, each aberration is corrected properly.

(117) Also, an imaging lens system achieving a wide field of view of about 82 degrees and high brightness with an F-value of about 2.4 is provided. Additionally, a ratio of total track length TTL to twice the maximum image height ih (TTL/2ih) is about 0.79, and compactness of the imaging lens is achieved though the imaging lens is composed of six constituent lenses.

EXAMPLE 11

(118) The basic lens data is shown below in Table 11.

(119) TABLE-US-00011 TABLE 11 Numerical Data Example 11 Unit mm f = 6.789 Fno = 2.38 ω(°) = 41.2 ih = 5.980 Surface Data Surface Curvature Surface Refractive Abbe Number i Radius r Distance d Index Nd Number vd (Object) Infinity Infinity 1* 22.222 1.098 1.5438 55.57 2* −20.000 0.115 3* 7.660 0.866 1.5438 55.57 4* −5.878 −0.101 5(Stop) Infinity 0.158 6* 5.936 0.483 1.6349 23.97 7* 2.502 0.994 8* 6.683 0.599 1.6349 23.97 9* 5.834 0.510 10* −13.249 1.576 1.5346 56.16 11* −1.915 0.515 12* 77.229 1.003 1.5346 56.16 13* 2.053 0.700 14 Infinity 0.300 1.5670 37.80 15 Infinity 1.019 Image Plane Infinity Constituent Lens Data Lens Start Surface Focal Length 1 1 19.535 2 3 6.257 3 6 −7.203 4 8 −99.590 5 10 3.994 6 12 −3.964 Aspheric Surface Data 1st Surface 2nd Surface 3rd Surface 4th Surface 6th Surface 7th Surface k 0.000E+00 0.000E−F00 −1.204E+00 2.508E+00 0.000E+00 −6.000E+00 A4 −5.638E−03 2.866E−03 6.180E−03 1.926E−02 −1.177E−02 4.162E−03 A6 3.436E−04 −4.028E−04 −1.431E−03 −8.652E−03 5.405E−03 5.547E−03 A8 −2.826E−05 5.670E−05 −4.358E−05 2.178E−03 −1.771E−03 −2.850E−03 A10 0.000E+00 0.000E+00 4.470E−05 −2.017E−04 2.686E−04 6.821E−04 A12 0.000E+00 0.000E+00 0.000E+00 0.000E+00 1.831E−05 −3.811E−05 A14 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 A16 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 8th Surface 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface k 0.000E+00 0.000E+00 0.000E+00 −3.671E+00 0.000E+00 −5.802E+00 A4 −1.933E−02 −1.499E−02 4.273E−03 −1.382E−02 −1.289E−02 −9.784E−03 A6 4.279E−04 −2.463E−05 7.236E−05 3.401E−03 9.265E−04 9.787E−04 A8 6.738E−04 1.901E−04 −3.182E−04 −5.994E−04 −1.538E−05 −7.718E−05 A10 −1.326E−04 −1.378E−05 6.449E−05 8.670E−05 3.021E−08 3.581E−06 A12 8.337E−06 1.277E−07 −3.840E−06 −4.824E−06 −4.054E−08 −8.898E−08 A14 0.000E+00 0.000E+00 0.000E+00 −7.397E−08 2.182E−09 9.330E−10 A16 0.000E+00 0.000E+00 0.000E+00 9.743E−09 −3.088E−11 0.000E+00

(120) According to the imaging lens in Example 11, the first lens L1 has positive refractive power, and as shown in Table 17, the imaging lens satisfies all of conditional expressions (1) and (2), and conditional expressions (4) to (14).

(121) FIG. 22 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 11. As shown in FIG. 22, each aberration is corrected properly.

(122) Also, an imaging lens system achieving a wide field of view of about 82 degrees and high brightness with an F-value of about 2.4 is provided. Additionally, a ratio of total track length TTL to twice the maximum image height ih (TTL/2ih) is about 0.81, and compactness of the imaging lens is achieved though the imaging lens is composed of six constituent lenses.

EXAMPLE 12

(123) The basic lens data is shown below in Table 12.

(124) TABLE-US-00012 TABLE 12 Numerical Data Example 12 Unit mm f = 3.211 Fno = 2.26 ω(°) = 41.3 ih = 2.934 Surface Data Surface Curvature Surface Refractive Abbe Number i Radius r Distance d Index Nd Number vd (Object) Infinity Infinity 1* −6.994 0.350 1.5348 55.66 2* −4.963 0.025 3(Stop) Infinity 0.060 4* 1.810 0.795 1.5348 55.66 5* −3.355 0.168 6* −1.663 0.220 1.6142 25.58 7* 44.516 0.141 8* 20.435 0.424 1.5438 55.57 9* −5.049 0.197 10* −2.566 0.425 1.6142 25.58 11* −1.283 0.345 12* 4.446 0.553 1.5348 55.66 13* 1.086 0.310 14 Infinity 0.210 1.5168 64.20 15 Infinity 0.448 Image Plane Infinity Constituent Lens Data Lens Start Surface Focal Length 1 1 30.143 2 4 2.323 3 6 −2.606 4 8 7.489 5 10 3.710 6 12 −2.850 Aspheric Surface Data 1st Surface 2nd Surface 4th Surface 5th Surface 6th Surface 7th Surface k 0.000E+00 0.000E−F00 0.000E+00 −3.299E+01 5.294E−01 0.000E+00 A4 −6.576E−02 −1.086E−01 −3.724E−02 −2.511E−01 −2.797E−01 −1.624E−01 A6 −1.905E−02 5.177E−02 −3.117E−03 −6.367E−02 4.044E−01 2.744E−01 A8 1.842E−02 0.000E+00 0.000E+00 3.180E−01 1.196E−01 1.581E−02 A10 1.144E−02 0.000E+00 0.000E+00 −1.237E−01 −2.266E−01 −2.271E−01 A12 −8.121E−03 0.000E+00 0.000E+00 −1.838E−03 8.086E−02 1.212E−01 A14 −3.256E−03 0.000E+00 0.000E+00 −9.313E−04 −4.465E−03 −6.205E−03 A16 2.389E−03 0.000E+00 0.000E+00 −2.150E−04 −2.657E−04 −7.512E−04 8th Surface 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface k 0.000E+00 1.340E+01 2.105E+00 −5.669E−01 3.985E+00 −4.897E+00 A4 −1.073E−01 −1.323E−01 4.015E−04 1.974E−01 −1.702E−01 −8.452E−02 A6 −6.162E−02 6.665E−02 −1.722E−02 −1.590E−01 3.864E−02 3.487E−02 A8 2.253E−01 2.339E−02 1.017E−02 1.100E−01 −2.599E−02 −1.280E−02 A10 −1.617E−01 7.464E−03 7.719E−03 −5.559E−02 1.242E−02 3.048E−03 A12 2.626E−02 −6.809E−03 −8.346E−03 1.515E−02 −3.012E−03 −4.975E−04 A14 4.458E−03 4.644E−04 3.931E−04 −4.959E−05 4.974E−04 5.301E−05 A16 7.034E−04 −6.030E−05 1.442E−04 −2.132E−05 −4.500E−05 −2.862E−06

(125) According to the imaging lens in Example 12, the first lens L1 has positive refractive power, and as shown in Table 17, the imaging lens satisfies all of conditional expressions (1) and (2), conditional expressions (4) to (8), conditional expression (9-1), conditional expression (10-1), conditional expression (11-1), and conditional expressions (12) to (14).

(126) FIG. 24 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 12. As shown in FIG. 24, each aberration is corrected properly.

(127) Also, an imaging lens system achieving a wide field of view of about 82 degrees and high brightness with an F-value of about 2.3 is provided. Additionally, a ratio of total track length TTL to twice the maximum image height ih (TTL/2ih) is about 0.78, and compactness of the imaging lens is achieved though the imaging lens is composed of six constituent lenses.

EXAMPLE 13

(128) The basic lens data is shown below in Table 13.

(129) TABLE-US-00013 TABLE 13 Numerical Data Example 13 Unit mm f = 3.408 Fno = 2.26 ω(°) = 40.0 ih = 2.934 Surface Data Surface Curvature Surface Refractive Abbe Number i Radius r Distance d Index Nd Number vd (Object) Infinity Infinity 1* −2.886 0.350 1.5348 55.66 2* −2.233 0.025 3(Stop) Infinity 0.060 4* 2.096 0.747 1.5348 55.66 5* −4.044 0.173 6* −2.032 0.220 1.6349 23.97 7* −7.701 0.268 8* −25.630 0.574 1.5438 55.57 9* −4.045 0.246 10* −1.885 0.591 1.6142 25.58 11* −1.421 0.047 12* 4.133 0.759 1.5348 55.66 13* 1.088 0.320 14 Infinity 0.210 1.5168 64.20 15 Infinity 0.413 Image Plane Infinity Constituent Lens Data Lens Start Surface Focal Length 1 1 15.548 2 4 2.696 3 6 −4.414 4 8 8.751 5 10 6.337 6 12 −3.022 Aspheric Surface Data 1st Surface 2nd Surface 4th Surface 5th Surface 6th Surface 7th Surface k 0.000E+00 0.000E+00 0.000E+00 −1.595E+01 7.858E−01 0.000E+00 A4 −7.311E−02 −1.490E−02 1.401E−02 −2.358E−01 −2.803E−01 −1.510E−01 A6 5.388E−02 −2.334E−03 −2.387E−02 −5.719E−02 3.673E−01 2.863E−01 A8 −4.853E−02 2.356E−02 −7.272E−02 2.254E−01 1.186E−01 1.806E−02 A10 3.390E−02 0.000E+00 0.000E+00 −1.333E−01 −1.808E−01 −2.054E−01 A12 3.805E−04 0.000E+00 0.000E+00 2.467E−02 3.472E−02 1.547E−01 A14 −4.346E−03 0.000E+00 0.000E+00 −1.423E−02 6.108E−03 −3.450E−02 A16 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 8th Surface 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface k 0.000E+00 8.928E+00 1.189E+00 −4.716E−01 4.100E+00 −5.295E+00 A4 −9.634E−02 −1.032E−01 6.200E−02 1.931E−01 −1.732E−01 −6.714E−02 A6 −1.040E−01 3.758E−02 −2.942E−02 −1.579E−01 2.814E−02 2.874E−02 A8 1.942E−01 2.211E−04 3.234E−02 1.070E−01 −2.561E−02 −1.137E−02 A10 −1.583E−01 3.015E−03 −7.435E−03 −5.399E−02 1.107E−02 3.021E−03 A12 4.658E−02 −5.074E−03 −9.914E−03 1.521E−02 −3.305E−03 −5.263E−04 A14 1.299E−02 4.069E−03 6.517E−03 −1.382E−03 5.822E−04 5.301E−05 A16 0.000E+00 0.000E+00 0.000E+00 0.000E+00 4.300E−05 −2.313E−06

(130) According to the imaging lens in Example 13, the first lens L1 has positive refractive power, and as shown in Table 17, the imaging lens satisfies all of conditional expressions (1) and (2), conditional expressions (4) to (8), conditional expression (9-1), conditional expression (10-1), conditional expression (11-1), and conditional expressions (12) to (14).

(131) FIG. 26 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Numerical Example 13. As shown in FIG. 26, each aberration is corrected properly.

(132) Also, an imaging lens system achieving a wide field of view of about 80 degrees and high brightness with an F-value of about 2.3 is provided. Additionally, a ratio of total track length TTL to twice the maximum image height ih (TTL/2ih) is about 0.84, and compactness of the imaging lens is achieved though the imaging lens is composed of six constituent lenses.

EXAMPLE 14

(133) The basic lens data is shown below in Table 14.

(134) TABLE-US-00014 TABLE 14 Numerical Data Example 14 Unit mm f = 3.407 Fno = 2.25 ω(°) = 40.1 ih = 2.934 Surface Data Surface Curvature Surface Refractive Abbe Number i Radius r Distance d Index Nd Number vd (Object) Infinity Infinity 1* −3.087 0.350 1.5348 55.66 2* −2.196 0.025 3(Stop) Infinity 0.060 4* 2.246 0.738 1.5348 55.66 5* −5.122 0.206 6* −2.265 0.220 1.6349 23.97 7* −6.043 0.288 8* −20.851 0.483 1.5438 55.57 9* −4.027 0.183 10* −1.807 0.711 1.6142 25.58 11* −1.297 0.047 12* 6.190 0.774 1.6142 25.58 13* 1.176 0.290 14 Infinity 0.210 1.5168 64.20 15 Infinity 0.428 Image Plane Infinity Constituent Lens Data Lens Start Surface Focal Length 1 1 12.508 2 4 3.025 3 6 −5.839 4 8 9.086 5 10 4.892 6 12 −2.511 Aspheric Surface Data 1st Surface 2nd Surface 4th Surface 5th Surface 6th Surface 7th Surface k 0.000E+00 0.000E+00 0.000E+00 −4.649E+01 1.256E+00 0.000E+00 A4 −8.829E−02 −1.267E−02 2.939E−02 −2.237E−01 −2.829E−01 −1.643E−01 A6 5.681E−02 1.221E−02 −1.948E−02 −4.588E−02 3.552E−01 2.857E−01 A8 −2.680E−02 1.892E−02 −4.638E−02 2.215E−01 1.125E−01 1.984E−02 A10 3.073E−02 0.000E+00 0.000E+00 −1.445E−01 −1.840E−01 −2.044E−01 A12 −1.770E−02 0.000E+00 0.000E+00 1.533E−02 3.501E−02 1.561E−01 A14 4.523E−03 0.000E+00 0.000E+00 2.980E−03 1.028E−02 −3.104E−02 A16 0.000E+00 0.000E+00 0.000E+00 3.712E−04 4.907E−04 −2.628E−04 8th Surface 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface k 0.000E+00 9.188E+00 1.181E+00 −4.577E−01 1.039E+00 −5.683E+00 A4 −7.447E−02 −6.094E−02 6.994E−02 1.523E−01 −1.859E−01 −7.655E−02 A6 −1.123E−01 1.883E−02 −4.090E−02 −1.523E−01 2.083E−02 3.040E−02 A8 1.666E−01 −1.224E−02 2.777E−02 1.097E−01 −1.927E−02 −1.144E−02 A10 −1.725E−01 −3.312E−03 −5.877E−03 −5.331E−02 1.205E−02 3.031E−03 A12 4.868E−02 −6.852E−03 −7.230E−03 1.535E−02 −3.271E−03 −5.277E−04 A14 2.563E−02 5.909E−03 5.464E−03 −1.272E−03 5.442E−04 5.271E−05 A16 3.575E−04 7.979E−06 5.198E−05 −1.670E−06 −1.275E−05 −2.263E−06

(135) According to the imaging lens in Example 14, the first lens L1 has positive refractive power, and as shown in Table 17, the imaging lens satisfies all of conditional expressions (1) and (2), conditional expressions (4) to (8), conditional expression (9-1), conditional expression (10-1), conditional expression (11-1), and conditional expressions (12) to (14).

(136) FIG. 28 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 14. As shown in FIG. 28, each aberration is corrected properly.

(137) Also, an imaging lens system achieving a wide field of view of about 80 degrees and high brightness with an F-value of about 2.3 is provided. Additionally, a ratio of total track length TTL to twice the maximum image height ih (TTL/2ih) is about 0.84, and compactness of the imaging lens is achieved though the imaging lens is composed of six constituent lenses.

EXAMPLE 15

(138) The basic lens data is shown below in Table 15.

(139) TABLE-US-00015 TABLE 15 Numerical Data Example 15 Unit mm f = 3.407 Fno = 2.13 ω(°) = 40.1 ih = 2.934 Surface Data Surface Curvature Surface Refractive Abbe Number i Radius r Distance d Index Nd Number vd (Object) Infinity Infinity 1* 4.622 0.332 1.5348 55.66 2* −7.538 0.025 3(Stop) Infinity 0.060 4* 6.029 0.513 1.5348 55.66 5* −10.935 0.278 6* −3.418 0.220 1.6349 23.97 7* 16.109 0.115 8* 3.871 0.485 1.5348 55.66 9* −10.847 0.396 10* −2.310 0.509 1.6142 25.58 11* −1.093 0.030 12* 10.232 0.839 1.6142 25.58 13* 1.103 0.300 14 Infinity 0.210 1.5168 64.20 15 Infinity 0.502 Image Plane Infinity Constituent Lens Data Lens Start Surface Focal Length 1 1 5.409 2 4 7.344 3 6 −4.421 4 8 5.396 5 10 2.914 6 12 −2.085 Aspheric Surface Data 1st Surface 2nd Surface 4th Surface 5th Surface 6th Surface 7th Surface k 0.000E+00 0.000E+00 0.000E+00 2.043E+01 3.536E+00 0.000E+00 A4 −7.515E−02 −2.447E−03 4.193E−02 −1.500E−01 −2.737E−01 −2.254E−01 A6 5.369E−03 2.031E−02 3.248E−02 −2.249E−02 3.051E−01 2.713E−01 A8 −9.424E−03 6.836E−02 −7.829E−03 1.238E−01 5.906E−02 3.135E−02 A10 7.979E−02 0.000E+00 0.000E+00 −1.354E−01 −2.347E−01 −2.077E−01 A12 −4.129E−02 0.000E+00 0.000E+00 5.327E−02 3.294E−02 1.298E−01 A14 −2.026E−03 0.000E+00 0.000E+00 5.284E−03 2.736E−02 −5.105E−02 A16 0.000E+00 0.000E+00 0.000E+00 −7.114E−03 1.037E−03 1.073E−02 8th Surface 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface k 0.000E+00 −9.189E+01 1.692E+00 −4.947E−01 1.558E+01 −5.340E+00 A4 −4.894E−02 9.285E−03 5.375E−02 1.456E−01 −2.032E−01 −8.327E−02 A6 −7.720E−02 −6.617E−03 −7.348E−02 −1.449E−01 4.289E−02 3.605E−02 A8 1.597E−01 −2.617E−02 2.851E−02 1.141E−01 −7.925E−03 −1.285E−02 A10 −1.771E−01 5.633E−05 −3.155E−03 −5.496E−02 1.116E−02 3.190E−03 A12 6.607E−02 −4.387E−03 −6.132E−03 1.502E−02 −5.480E−03 −5.268E−04 A14 3.202E−02 5.020E−03 4.392E−03 −5.338E−04 1.049E−04 4.953E−05 A16 −2.240E−02 −1.607E−03 −3.282E−03 4.992E−04 2.505E−04 −1.999E−06

(140) According to the imaging lens in Example 15, the first lens L1 has positive refractive power, and as shown in Table 17, satisfies conditional expressions (1) and (2), conditional expressions (4) to (8), conditional expression (9-1), conditional expression (10-1), conditional expression (11-1), and conditional expressions (12) to (14).

(141) FIG. 30 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 15. As shown in FIG. 30, each aberration is corrected properly.

(142) Also, an imaging lens system achieving a wide field of view of about 80 degrees and high brightness with an F-value of about 2.1 is provided. Additionally, a ratio of total track length TTL to twice the maximum image height ih (TTL/2ih) is about 0.81, and compactness of the imaging lens is achieved though the imaging lens is composed of six constituent lenses.

EXAMPLE 16

(143) The basic lens data is shown below in Table 16.

(144) TABLE-US-00016 TABLE 16 Numerical Data Example 16 Unit mm f = 3.408 Fno = 2.16 ω(°) = 40.1 ih = 2.934 Surface Data Surface Curvature Surface Refractive Abbe Number i Radius r Distance d Index Nd Number vd (Object) Infinity Infinity 1* 5.840 0.301 1.5348 55.66 2* −39.848 0.025 3(Stop) Infinity 0.060 4* 2.811 0.643 1.5348 55.66 5* −5.467 0.231 6* −3.109 0.220 1.6349 23.97 7* 90.980 0.261 8* 17.130 0.457 1.5438 55.57 9* −5.316 0.187 10* −1.937 0.496 1.6375 23.25 11* −1.160 0.045 12* 5.287 0.760 1.6142 25.58 13* 1.075 0.300 14 Infinity 0.210 1.5168 64.20 15 Infinity 0.547 Image Plane Infinity Constituent Lens Data Lens Start Surface Focal Length 1 1 9.545 2 4 3.568 3 6 −4.730 4 8 7.514 5 10 3.633 6 12 −2.358 Aspheric Surface Data 1st Surface 2nd Surface 4th Surface 5th Surface 6th Surface 7th Surface k 0.000E+00 0.000E+00 0.000E+00 −4.727E+01 2.264E+00 0.000E+00 A4 −9.323E−02 −4.240E−02 3.821E−02 −1.539E−01 −2.714E−01 −1.969E−01 A6 8.517E−03 −3.908E−02 −1.414E−02 −2.792E−02 3.104E−01 2.818E−01 A8 −4.250E−02 4.395E−02 −3.106E−02 1.476E−01 7.640E−02 1.678E−02 A10 5.241E−02 0.000E+00 0.000E+00 −1.605E−01 −2.000E−01 −2.039E−01 A12 −1.307E−02 0.000E+00 0.000E+00 3.622E−02 4.064E−02 1.511E−01 A14 −2.711E−03 0.000E+00 0.000E+00 1.528E−02 2.390E−02 −3.691E−02 A16 0.000E+00 0.000E+00 0.000E+00 −5.240E−04 3.270E−03 −9.300E−04 8th Surface 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface k 0.000E+00 7.694E+00 1.151E+00 −4.662E−01 −6.929E+00 −5.139E+00 A4 −4.891E−02 −3.174E−02 7.054E−02 1.617E−01 −2.034E−01 −8.601E−02 A6 −1.083E−01 5.541E−03 −4.921E−02 −1.480E−01 3.476E−02 3.514E−02 A8 1.571E−01 −1.941E−02 2.925E−02 1.106E−01 −1.497E−02 −1.246E−02 A10 −1.735E−01 −2.416E−03 −7.971E−03 −5.400E−02 1.146E−02 3.096E−03 A12 5.325E−02 −6.383E−03 −7.906E−03 1.552E−02 −3.971E−03 −5.230E−04 A14 2.623E−02 4.417E−03 5.456E−03 −8.732E−04 4.677E−04 5.200E−05 A16 −1.404E−02 −1.796E−03 −6.134E−04 2.266E−04 5.244E−05 −2.269E−06

(145) According to the imaging lens in Example 16, the first lens L1 has positive refractive power, and as shown in Table 17, the imaging lens satisfies conditional expressions (1) and (2), conditional expressions (4) to (8), conditional expression (9-1), conditional expression (10-1), conditional expression (11-1), and conditional expressions (12) to (14).

(146) FIG. 32 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 16. As shown in FIG. 32, each aberration is corrected properly.

(147) Also, an imaging lens system achieving a wide field of view of about 80 degrees and high brightness with an F-value of about 2.2 is provided. Additionally, a ratio of total track length TTL to twice the maximum image height ih (TTL/2ih) is about 0.80, and compactness of the imaging lens is achieved though the imaging lens is composed of six constituent lenses.

(148) As explained above, the imaging lens according to this embodiment of the present invention enables photographing over a wide field of view of more than 80 degrees, and achieving high-resolution optical system lens which corrects aberrations properly. Also, compactness of the imaging lens is achieving so that a ratio of total track length TTL to twice the maximum image height ih (TTL/2ih) attains less than 1.0, and bright imaging lens system is obtained with an F-value of 2.1 to 2.5.

(149) Table 17 shows value of conditional expressions in relation to Examples 1 to 16.

(150) TABLE-US-00017 TABLE 17 Example1 Example2 Example3 Example4 Example5 Example6 Example7 Example8 |r1/f| 18.38 7.37 44.09 41.42 36.71 2.63 2.54 18.71 f1/f 3.20 2.92 1.25 3.31 7.07 3.59 4.69 3.32 (r3 + r4)/(r3 − r4) −0.03 −0.06 0.83 0.46 0.23 0.44 0.28 −0.02 |f4/f| 4.15 24.35 7.89 1.04 1.32 6.50 7.76 6.27 vd1 55.57 55.57 55.57 55.57 55.57 55.57 55.57 55.57 vd2 55.57 55.57 55.57 55.57 55.57 55.57 55.57 55.57 vd3 25.58 25.58 25.58 25.58 25.58 23.97 23.97 23.97 vd4 25.58 25.58 25.58 25.58 25.58 23.97 23.97 23.97 vd5 56.16 56.16 56.16 56.16 56.16 56.16 56.16 56.16 vd6 56.16 56.16 56.16 56.16 56.16 56.16 56.16 56.16 ih/f 0.88 0.88 0.88 0.88 0.88 1.01 0.96 0.92 f2/f3 −0.81 −0.85 −1.36 −0.58 −0.55 −0.74 −0.72 −0.76 f5/f6 −0.99 −1.11 −1.02 −0.77 −0.79 −0.81 −0.83 −1.04 Example9 Example10 Example11 Example12 Example13 Example14 Example15 Example16 |r1/f| 2.92 3.39 3.27 2.18 0.85 0.91 1.36 1.71 f1/f −60.16 −7.82 2.88 9.39 4.56 3.67 1.59 2.80 (r3 + r4)/(r3 − r4) 0.00 −0.21 0.13 −0.30 −0.32 −0.39 −0.29 −0.32 |f4/f| 2.39 132.38 14.67 2.33 2.57 2.67 1.58 2.20 vd1 55.57 55.57 55.57 55.66 55.66 55.66 55.66 55.66 vd2 55.57 55.57 55.57 55.66 55.66 55.66 55.66 55.66 vd3 23.97 23.97 23.97 25.58 23.97 23.97 23.97 23.97 vd4 56.16 56.16 23.97 55.57 55.57 55.57 55.66 55.57 vd5 56.16 56.16 56.16 25.58 25.58 25.58 25.58 23.25 vd6 56.16 56.16 56.16 55.66 55.66 25.58 25.58 25.58 ih/f 0.89 0.88 0.88 0.91 0.86 0.86 0.86 0.86 f2/f3 −0.76 −0.63 −0.87 −0.89 −0.61 −0.52 −1.66 −0.75 f5/f6 −0.95 −1.05 −1.01 −1.30 −2.10 −1.95 −1.40 −1.54

(151) According to the imaging lens composed of six constituent lenses related to the present invention, there is provided an imaging lens which meets the demand for a wide field of view while maintaining compactness of the lens and the demand for high resolution. Particularly if the imaging lens is applied to high-functional products such as smart TV and 4K TV, to information terminal devices such as game console and PC, and to mobile terminal devices such as smart phone, mobile phone, and PDA (Personal Digital Assistant) reducing compactness and size and thickness, the imaging lens can enhance camera performance of the products.

EXPLANATION OF THE SYMBOLS

(152) ST Aperture stop L1 First lens L2 Second lens L3 Third lens L4 Fourth lens L5 Fifth lens L6 Sixth lens ih Maximum image height

Image pickup lens

Assignee

Inventors

Cpc classification

Classification Explorer

G02B13/00

PHYSICS

Classification Explorer

G02B13/0015

PHYSICS

Classification Explorer

G02B13/002

PHYSICS

Classification Explorer

G02B27/0025

PHYSICS

Classification Explorer

G02B9/00

PHYSICS

Classification Explorer

G02B13/001

PHYSICS

Classification Explorer

G02B13/0045

PHYSICS

Classification Explorer

G02B9/62

PHYSICS

International classification

Classification Explorer

G02B13/00

PHYSICS

Classification Explorer

G02B27/00

PHYSICS

Classification Explorer

G02B9/62

PHYSICS

Classification Explorer

G02B9/00

PHYSICS

Abstract

Claims

Description