Imaging lens

Abstract

There is provided an imaging lens with high resolution which satisfies in well balance the low-profileness and the low F-number and properly corrects aberrations. An imaging lens comprises a first lens having positive refractive power, a second lens having the positive refractive power, a third lens, a fourth lens, a fifth lens being a double-sided aspheric lens, and a sixth lens being double-sided aspheric lens and having a concave surface facing the image side near the optical axis, wherein the image-side surface of the sixth lens is an aspheric surface changing to the convex surface at a peripheral area.

Claims

1. An imaging lens comprising in order from an object side to an image side, a stop, a first lens having positive refractive power, a second lens, a third lens, a fourth lens, a fifth lens being a double-sided aspheric lens and has plane surfaces on both sides near an optical axis, and a sixth lens being a double-sided aspheric lens and having a concave surface facing the image side near the optical axis, wherein an image-side surface of said sixth lens is an aspheric surface changing to the convex surface at a peripheral area, wherein a below conditional expression (15) is satisfied:
0.6<f2/f4<2.6 (15) where f2: focal length of the second lens, and f4: focal length of the fourth lens.

2. The imaging lens according to claim 1, wherein a second lens having the positive refractive power.

3. The imaging lens according to claim 1, wherein below conditional expressions (1) and (2) are satisfied:
1.5<vd4/vd5<3.6 (1)
0.30<(T3/TTL)×100<0.85 (2) where vd4: abbe number at d-ray of a fourth lens, vd5: abbe number at d-ray of a fifth lens, T3: distance along an optical axis from an image-side surface of the third lens to an object-side surface of the fourth lens, and TTL: distance along an optical axis from an object-side surface of the first lens to an image plane.

4. The imaging lens according to claim 1, wherein a below conditional expression (3) is satisfied:
0.5<vd1/(vd2+vd3)<1.0 (3) where vd1: abbe number at d-ray of a first lens, vd2: abbe number at d-ray of a second lens, and vd3: abbe number at d-ray of a third lens.

5. The imaging lens according to claim 1, wherein said second lens has a biconvex shape near the optical axis.

6. The imaging lens according to claim 1, wherein said second lens has a meniscus shape having a concave surface facing the object side near the optical axis.

7. The imaging lens according to claim 1, wherein said fourth lens has a biconvex shape near the optical axis.

8. The imaging lens according to claim 1, wherein said fourth lens has a meniscus shape having a concave surface facing the object side near the optical axis.

9. The imaging lens according to claim 1, wherein a below conditional expression (4) is satisfied:
1.35<f1/f<3.30 (4) where f1: focal length of the first lens, and f: focal length of the overall optical system.

10. The imaging lens according to claim 1, wherein a below conditional expression (5) is satisfied:
0.8<f2/f<3.4 (5) where f2: focal length of the second lens, and f: focal length of the overall optical system.

11. The imaging lens according to claim 1, wherein a below conditional expression (6) is satisfied:
−1.70<f3/f<−0.65 (6) where f3: focal length of the third lens, and f: focal length of the overall optical system.

12. The imaging lens according to claim 1, wherein a below conditional expression (7) is satisfied:
0.65<f4/f<2.10 (7) where f4: focal length of the fourth lens, and f: focal length of the overall optical system.

13. The imaging lens according to claim 1, wherein a below conditional expression (8) is satisfied:
1.9<|f6|/f (8) where f6: focal length of the sixth lens, and f: focal length of the overall optical system.

14. The imaging lens according to claim 1, wherein a below conditional expression (9) is satisfied:
0.1<D6/ΣD<0.3 (9) where D6: thickness on the optical axis of the sixth lens, and ΣD: total sum of thickness on the optical axis of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens.

15. The imaging lens according to claim 1, wherein a below conditional expression (10) is satisfied:
0.7<Σ(L1F−L6R)/f<1.6 (10) where Σ(L1F−L6R): distance along the optical axis from the object-side surface of the first lens to the image-side surface of the sixth lens, and f: focal length of the overall optical system.

16. The imaging lens according to claim 1, wherein a below conditional expression (11) is satisfied:
0.1<r5/r6<0.7 (11) where r5: paraxial curvature radius of the object-side surface of the third lens, and r6: paraxial curvature radius of the image-side surface of the third lens.

17. The imaging lens according to claim 1, wherein a below conditional expressions (12) and (13) are satisfied:
0.20<r11/f<0.55 (12)
0.15<r12/f<0.45 (13) where r11: paraxial curvature radius of the object-side surface of the sixth lens, r12: paraxial curvature radius of the image-side surface of the sixth lens, and f: focal length of the overall optical system.

18. The imaging lens according to claim 1, wherein a below conditional expression (14) is satisfied:
Fno≤2.0 (14) where Fno: F-number.

19. An imaging lens comprising in order from an object side to an image side, a stop, a first lens having positive refractive power, a second lens, a third lens, a fourth lens, a fifth lens being a double-sided aspheric lens and has plane surfaces on both sides near an optical axis, and a sixth lens being a double-sided aspheric lens and having a concave surface facing the image side near the optical axis, wherein an image-side surface of said sixth lens is an aspheric surface changing to the convex surface at a peripheral area, wherein below conditional expressions (1) and (2) are satisfied:
1.5<vd4/vd5<3.6 (1)
0.30<(T3/TTL)×100<0.85 (2) where vd4: abbe number at d-ray of a fourth lens, vd5: abbe number at d-ray of a fifth lens, T3: distance along an optical axis from an image-side surface of the third lens to an object-side surface of the fourth lens, and TTL: distance along an optical axis from an object-side surface of the first lens to an image plane.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

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

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

(8) FIG. 8 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 4 according to the present invention.

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

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

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

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

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

(14) FIG. 14 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 7 according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

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

(16) FIGS. 1, 3, 5, 7, 9, 11 and 13 are schematic views of the imaging lenses in Examples 1 to 7 according to the embodiments of the present invention, respectively.

(17) As shown in FIG. 1, the imaging lens according to the present embodiments comprises in order from an object side to an image side, a first lens L1 having positive refractive power, a second lens L2 having the positive refractive power, a third lens L3, a fourth lens L4, a fifth lens L5 being a double-sided aspheric lens, and a sixth lens L6 having a concave surface facing the image side near the optical axis X. The image-side surface of the sixth lens L6 is an aspheric surface changing to the convex surface at a peripheral area.

(18) A filter IR such as an IR cut filter and a cover glass are arranged between the sixth lens L6 and an image plane IMG. The filter IR is omissible.

(19) The first lens L1 has the positive refractive power, and occurrence of aberrations is suppressed by aspheric surfaces on both sides and low-profileness and wide field of view of the imaging lens are achieved. The first lens L1 has a meniscus shape having a convex surface facing the object side near the optical axis X, or a biconvex shape having convex surfaces facing the object side and the image side near the optical axis X. In an Example shown in FIG. 1, an Example 2 shown in FIG. 3, an Example 3 shown in FIG. 5, an Example 5 shown in FIG. 9 and an Example 7 shown in FIG. 13, the first lens L1 has the meniscus shape having the convex surface facing the object side near the optical axis X. In this case, a position of principal point on the image side of the imaging lens moves toward the object side, and it is advantageous for the low-profileness. In an Example 4 shown in FIG. 7 and an Example 6 shown in FIG. 11, the first lens L1 has the biconvex shape having the convex surfaces facing the object side and the image side near the optical axis X. In this case, the position of principal point on the image side of the imaging lens moves toward the image side, and it is advantageous for the wide field of view.

(20) The second lens L2 has the positive refractive power, and astigmatism and field curvature are properly corrected by aspheric surfaces on both sides and the low-profileness and the wide field of view of the imaging lens are achieved. The second lens L2 has the biconvex shape having the convex surfaces facing the object side and the image side near the optical axis X, or a meniscus shape having a concave surface facing the object side near the optical axis X. In the Example 1 shown in FIG. 1, the Example 2 shown in FIG. 3, the Example 3 shown in FIG. 5, the Example 4 shown in FIG. 7 and the Example 7 shown in FIG. 13, the second lens L2 has the biconvex shape having the convex surfaces facing the object side and the image side near the optical axis X. In this case, the positive refractive power is appropriately allocated to the object-side surface and the image-side surface. Therefore, large positive refractive power can be provided while suppressing occurrence of the spherical aberration. As a result, the imaging lens can achieve further low-profileness and wide field of view. In the Example 5 shown in FIG. 9 and the Example 6 shown in FIG. 11, the second lens L2 has the meniscus shape having a concave surface facing the object side near the optical axis X. In this case, the light ray incident angle to the second lens L2 can be appropriately controlled, and the coma aberration and high-order spherical aberration are properly corrected.

(21) The third lens L3 has negative refractive power, and the spherical aberration, the coma aberration, the astigmatism and the chromatic aberration are properly corrected by the aspheric surfaces on both sides. A shape of the third lens L3 is the meniscus shape having a concave surface facing the object side near the optical axis X. Therefore, the light ray incident angle to the third lens L3 can be appropriately controlled, and the coma aberration and the high-order spherical aberration are properly corrected.

(22) The fourth lens L4 has the positive refractive power, and the astigmatism and the field curvature are properly corrected by the aspheric surfaces on both sides and the low-profileness and the wide field of view of the imaging lens are achieved. The fourth lens L4 has the biconvex shape having the convex surfaces facing the object side and the image side near the optical axis X, or the meniscus shape having the concave surface facing the object side near the optical axis X. In the Example 1 shown in FIG. 1, the Example 2 shown in FIG. 3, the Example 3 shown in FIG. 5, the Example 4 shown in FIG. 7, the Example 5 shown in FIG. 9 and the Example 6 shown in FIG. 11, the fourth lens L4 has the biconvex shape near the optical axis X. In this case, the positive refractive power is appropriately allocated to the object-side surface and the image-side surface. Therefore, the large positive refractive power can be provided while suppressing occurrence of the spherical aberration. As a result, the imaging lens can achieve further low-profileness and wide field of view. In the Example 7 shown in FIG. 13, the fourth lens L4 has the meniscus shape having the concave surface facing the object side near the optical axis X. In this case, the light ray incident angle to the fourth lens L4 can be appropriately controlled, and the coma aberration and the high-order spherical aberration are properly corrected.

(23) The fifth lens L5 reduces burden on the sixth lens L6 which corrects the field curvature and the distortion and controls light ray incident angle to the image sensor, and also corrects chromatic aberration of magnification by the aspheric surfaces on the both sides. The fifth lens L5 has plane surfaces on both sides near the optical axis X, and is an aberration correction lens having no substantial refractive power near the optical axis X. Therefore, the aberrations can be properly corrected without affecting the focal length of the overall optical system or allocation of the refractive power of other lenses. The fifth lens L5 is not limited to the double-sided plane surface shape near the optical axis X. If effect on the focal length of the overall optical system or the refractive power of each lens is suppressed to small, various shapes may be applicable for the fifth lens L5, such as a meniscus shape having the convex surface facing the object side, a biconvex shape having the convex surfaces facing the object side and the image side, a meniscus shape having the concave surface facing the object side, a biconcave shape having the concave surfaces facing the object side and the image side, a shape having a plane surface facing the object side and a convex or a concave surface facing the image side, and a shape having the plane surface facing the image side and the convex or the concave surface facing the object side.

(24) The sixth lens L6 has the concave surface facing the image side near the optical axis X and the negative refractive power, and secures back focus while maintaining the low-profileness. The refractive power of the sixth lens L6 may be the positive refractive power as shown in the Example 7 shown in FIG. 13. Furthermore, correction of the field curvature and the distortion, and control of light ray incident angle to the image sensor are made by the aspheric surfaces on the both sides. The image-side surface of the sixth lens L6 is the aspheric surface having a pole point and changes to the convex surface at an area apart from the optical axis X and maintains the convex shape until an edge of an effective diameter. By applying such aspheric surface, correction of the field curvature and control of light ray angle to an image sensor are facilitated.

(25) In the imaging lens according to the present invention, an aperture stop ST is arranged on the object side of the first lens L1. By arranging the aperture stop ST closest to the object, a position of entrance pupil gets away from the image plane, and control of the light ray incident angle to the image sensor and telecentricity becomes facilitated.

(26) Regarding the imaging lens according to the present embodiments, for example as shown in FIG. 1, all lenses of the first lens L1 to the sixth lens L6 are preferably single lenses which are not cemented each other. Configuration without the cemented lens can frequently use the aspheric surfaces, and proper correction of the aberrations can be realized. Furthermore, workload for cementing is reduced, and manufacturing in low cost becomes possible.

(27) Regarding the imaging lens according to the present embodiments, a plastic material is used for all of the lenses, and manufacturing is facilitated and mass production in a low cost can be realized. Both-side surfaces of all lenses are appropriate aspheric, and the aberrations are favorably corrected.

(28) The material applied to the lens is not limited to the plastic material. By using glass material, further high performance may be aimed. All of surfaces of lenses are preferably formed as aspheric surfaces, however, spherical surfaces may be adopted which is easy to manufacture in accordance with required performance.

(29) The imaging lens according to the present embodiments shows preferable effect by satisfying the below conditional expressions (1) to (17).
1.5<vd4/vd5<3.6 (1)
0.30<(T3/TTL)×100<0.85 (2)
0.5<vd1/(vd2+vd3)<1.0 (3)
1.35<f1/f<3.30 (4)
0.8<f2/f<3.4 (5)
−1.70<f3/f<−0.65 (6)
0.65<f4/f<2.10 (7)
1.9<|f6|/f (8)
0.1<D6/ΣD<0.3 (9)
0.7<Σ(L1F−L6R)/f<1.6 (10)
0.1<r5/r6<0.7 (11)
0.20<r11/f<0.55 (12)
0.15<r12/f<0.45 (13)
Fno≤2.0 (14)
0.6<f2/f4<2.6 (15)
0.60<T3/T4<1.35 (16)
5<(D5/TTL)×100<12 (17)
where
vd1: abbe number at d-ray of a first lens L1,
vd2: abbe number at d-ray of a second lens L2,
vd3: abbe number at d-ray of a third lens L3,
vd4: abbe number at d-ray of a fourth lens L4,
vd5: abbe number at d-ray of a fifth lens L5,
T3: distance along an optical axis from an image-side surface of the third lens L3 to an object-side surface of the fourth lens L4,
T4: distance along an optical axis from an image-side surface of the fourth lens L4 to an object-side surface of the fifth lens L5,
TTL: distance along an optical axis from an object-side surface of the first lens L1 to an image plane,
f: focal length of the overall optical system,
f1: focal length of the first lens L1,
f2: focal length of the second lens L2,
f3: focal length of the third lens L3,
f4: focal length of the fourth lens L4,
f6: focal length of the sixth lens L6,
D5: thickness on the optical axis of the fifth lens L5,
D6: thickness on the optical axis of the sixth lens L6,
ΣD: total sum of thickness on the optical axis X of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6,
Σ(L1F−L6R): distance along the optical axis X from the object-side surface of the first lens L1 to the image-side surface of the sixth lens L6,
r5: paraxial curvature radius of the object-side surface of the third lens L3,
r6: paraxial curvature radius of the image-side surface of the third lens L3,
r11: paraxial curvature radius of the object-side surface of the sixth lens L6,
r12: paraxial curvature radius of the image-side surface of the sixth lens L6, and
Fno: F-number.

(30) It is not necessary to satisfy the above all conditional expressions, and by satisfying the conditional expression individually, operational advantage corresponding to each conditional expression can be obtained.

(31) The imaging lens according to the present embodiments shows further preferable effect by satisfying the below conditional expressions (1a) to (17a).
1.85<vd4/vd5<3.20 (1a)
0.40<(T3/TTL)×100<0.75 (2a)
0.60<vd1/(vd2+vd3)<0.85 (3a)
1.65<f1/f<2.90 (4a)
1.00<f2/f<2.95 (5a)
−1.5<f3/f<−0.8 (6a)
0.80<f4/f<1.85 (7a)
2.4<|f6|/f<20.0 (8a)
0.14<D6/ΣD<0.25 (9a)
0.9<Σ(L1F−L6R)/f<1.4 (10a)
0.13<r5/r6<0.60 (11a)
0.24<r11/f<0.45 (12a)
0.20<r12/f<0.35 (13a)
Fno≤1.9 (14a)
0.75<f2/f4<2.3 (15a)
0.75<T3/T4<1.20 (16a)
6<(D5/TTL)×100<10 (17a)

(32) The signs in the above conditional expressions have the same meanings as those in the paragraph before the preceding paragraph.

(33) In this embodiment, the aspheric shapes of the surfaces of the aspheric lens are expressed by Equation 1, where Z denotes an axis in the optical axis direction, H denotes a height perpendicular to the optical axis, R denotes a curvature radius, k denotes a conic constant, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 denote aspheric surface coefficients.

(34) $\begin{matrix} Z = \frac{\frac{H^{2}}{R}}{1 + \sqrt{1 - (k + 1) \frac{{II}^{2}}{R^{2}}}} + Λ_{4} H^{4} ++ Λ_{6} H^{6} + Λ_{8} H^{8} + Λ_{10} H^{10} + Λ_{12} H^{12} + Λ_{14} H^{14} + Λ_{16} H^{16} + Λ_{18} H^{18} + Λ_{20} H^{20} & Equation 1 \end{matrix}$

(35) 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 a maximum image height. Additionally, i denotes surface number counted from the object side, r denotes a curvature radius, d denotes the distance of lenses along the optical axis (surface distance), Nd denotes a refractive index at d-ray (reference wavelength), and vd denotes an abbe number at d-ray. As for aspheric surfaces, an asterisk (*) is added after surface number i.

EXAMPLE 1

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

(37) TABLE-US-00001 TABLE 1 Example 1 Unit mm f = 2.72 ih = 3.26 Fno = 1.8 TTL = 4.11 ω(°) = 50.1 Surface Data Surface Curvature Surface Refractive Abbe Number i Radius r Distance d Index Nd Number νd (Object) Infinity Infinity 1 (Stop) Infinity −0.0510 2* 2.2524 0.4131 1.544 55.86 (vd1) 3* 5.3692 0.1174 4* 6.0879 0.4526 1.535 55.66 (vd2) 5* −2.3793 0.3515 6* −0.7310 0.3300 1.661 20.37 (vd3) 7* −1.4661 0.0260 8* 10.0989 0.3825 1.544 55.86 (vd4) 9* −2.3572 0.0300 10* Infinity 0.3600 1.614 25.58 (vd5) 11* Infinity 0.0334 12* 1.0843 0.4918 1.535 55.66 (vd6) 13* 0.8614 0.5000 14 Infinity 0.2100 1.517 64.20 15 Infinity 0.4818 Image Plane Infinity Constituent Lens Data Lens Start Surface Focal Length 1 2 6.810 2 4 3.259 3 6 −2.686 4 8 3.550 5 10 Infinity 6 12 −33.885 Aspheric Surface Data Second Surface Third Surface Fourth Surface Fifth Surface Sixth Surface Seventh Surface k −2.331179E+00 0.000000E+00 −1.000000E+00 −9.999999E−01 −1.000000E+00 0.000000E+00 A4 −7.527715E−02 −2.220918E−01 −1.512366E−01 −1.504052E−01 7.168343E−02 −8.029630E−02 A6 2.319407E−02 −8.729089E−02 −2.817847E−01 1.138025E−02 −7.631071E−01 −3.797023E−01 A8 −2.762643E−01 −6.155922E−01 −1.869433E−01 −3.627602E−01 3.243245E+00 2.386234E+00 A10 0.000000E+00 7.070838E−01 −8.875539E−02 −4.029084E−01 −6.825057E+00 −4.836478E+00 A12 0.000000E+00 0.000000E+00 4.416396E−01 2.133227E+00 7.731701E+00 5.042076E+00 A14 0.000000E+00 0.000000E+00 0.000000E+00 −2.637456E+00 −4.665493E+00 −2.735304E+00 A16 0.000000E+00 0.000000E+00 0.000000E+00 1.077927E+00 1.329231E+00 6.183892E−01 A18 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 A20 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 Eighth Surface Ninth Surface Tenth Surface Eleventh Surface Twelfth Surface Thirteenth Surface k −1.186726E+01 −5.494574E+00 0.000000E+00 0.000000E+00 −1.749347E+00 −6.224194E+00 A4 −5.858264E−01 −1.765618E−01 8.845825E−01 1.230193E+00 −1.898125E−01 −2.683399E−02 A6 1.714607E+00 8.112415E−01 −1.924596E+00 −2.751103E+00 −8.109097E−03 −9.674510E−02 A8 −2.741997E+00 −1.751492E+00 2.291965E+00 3.353928E+00 −1.072885E−01 9.456732E−02 A10 2.709759E+00 2.347716E+00 −1.836641E+00 −2.645794E+00 2.127916E−01 −4.148820E−02 A12 −1.725241E+00 −1.916429E+00 1.045465E+00 1.383599E+00 −1.392192E−01 1.029346E−02 A14 6.799612E−01 9.003401E−01 −4.350007E−01 −4.715054E−01 4.558670E−02 −1.491162E−03 A16 −1.588798E−01 −2.213776E−01 1.248930E−01 9.966130E−02 −8.140478E−03 1.162402E−04 A18 1.837638E−02 2.196511E−02 −2.120587E−02 −1.178062E−02 7.602449E−04 −3.548513E−06 A20 0.000000E+00 0.000000E+00 1.550254E−03 5.927364E−04 −2.916836E−05 −2.250417E−08

(38) The imaging lens in Example 1 satisfies conditional expressions (1) to (17) as shown in Table 8.

(39) 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 a sagittal image surface S and on tangential image surface T, respectively (same as FIGS. 4, 6, 8, 10, 12 and 14). As shown in FIG. 2, each aberration is corrected excellently.

EXAMPLE 2

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

(41) TABLE-US-00002 TABLE 2 Example 2 Unit mm f = 2.66 ih = 3.26 Fno = 1.8 TTL = 4.09 ω(°) = 49.9 Surface Data Surface Curvature Surface Refractive Abbe Number i Radius r Distance d Index Nd Number νd (Object) Infinity Infinity 1 (Stop) Infinity −0.0510 2* 2.2559 0.3923 1.544 55.86 (vd1) 3* 6.3436 0.1209 4* 9.5000 0.4886 1.535 55.66 (vd2) 5* −2.5193 0.3838 6* −0.7424 0.2421 1.661 20.37 (vd3) 7* −1.5132 0.0200 8* 12.0245 0.4556 1.544 55.86 (vd4) 9* −1.9696 0.0200 10* Infinity 0.3635 1.614 25.58 (vd5) 11* Infinity 0.0451 12* 1.0176 0.5421 1.535 55.66 (vd6) 13* 0.7909 0.5000 14 Infinity 0.2100 1.517 64.20 15 Infinity 0.3742 Image Plane Infinity Constituent Lens Data Lens Start Surface Focal Length 1 2 6.222 2 4 3.777 3 6 −2.521 4 8 3.145 5 10 Infinity 6 12 −39.776 Aspheric Surface Data Second Surface Third Surface Fourth Surface Fifth Surface Sixth Surface Seventh Surface k −2.695462E+00 0.000000E+00 −3.119093E+01 −1.335637E−01 −9.278509E−01 0.000000E+00 A4 −7.527715E−02 −2.220918E−01 −1.512366E−01 −1.504052E−01 7.168343E−02 −8.029630E−02 A6 2.319407E−02 −8.729089E−02 −2.817847E−01 1.138025E−02 −7.631071E−01 −3.797023E−01 A8 −2.762643E−01 −6.155922E−01 −1.869433E−01 −3.627602E−01 3.243245E+00 2.386234E+00 A10 0.000000E+00 7.070838E−01 −8.875539E−02 −4.029084E−01 −6.825057E+00 −4.836478E+00 A12 0.000000E+00 0.000000E+00 4.416396E−01 2.133227E+00 7.731701E+00 5.042076E+00 A14 0.000000E+00 0.000000E+00 0.000000E+00 −2.637456E+00 −4.665493E+00 −2.735304E+00 A16 0.000000E+00 0.000000E+00 0.000000E+00 1.077927E+00 1.329231E+00 6.183892E−01 A18 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 A20 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 Eighth Surface Ninth Surface Tenth Surface Eleventh Surface Twelfth Surface Thirteenth Surface k 9.780001E+01 −3.361475E+00 0.000000E+00 0.000000E+00 −1.804938E+00 −4.974734E+00 A4 −5.779474E−01 −1.493699E−01 9.373616E−01 1.235279E+00 −1.996052E−01 −2.768815E−02 A6 1.778412E+00 7.726362E−01 −1.985774E+00 −2.741133E+00 −1.225109E−02 −9.625771E−02 A8 −3.077586E+00 −1.755397E+00 2.356057E+00 3.329674E+00 −1.069381E−01 9.673744E−02 A10 3.239769E+00 2.345984E+00 −1.898728E+00 −2.635137E+00 2.133280E−01 −4.256441E−02 A12 −2.138360E+00 −1.914744E+00 1.074841E+00 1.382481E+00 −1.392405E−01 1.040494E−02 A14 7.708789E−01 9.001788E−01 −4.374730E−01 −4.716857E−01 4.556365E−02 −1.474588E−03 A16 −1.003858E−01 −2.228034E−01 1.215196E−01 9.969614E−02 −8.139113E−03 1.151275E−04 A18 −9.792236E−03 2.278357E−02 −1.973163E−02 −1.178015E−02 7.604543E−04 −4.077100E−06 A20 0.000000E+00 0.000000E+00 1.335666E−03 5.924430E−04 −2.917784E−05 2.624107E−08

(42) The imaging lens in Example 2 satisfies conditional expressions (1) to (17) as shown in Table 8.

(43) 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 excellently.

EXAMPLE 3

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

(45) TABLE-US-00003 TABLE 3 Example 3 Unit mm f = 2.59 ih = 3.26 Fno = 1.8 TTL = 3.94 ω(°) = 51.2 Surface Data Surface Curvature Surface Refractive Abbe Number i Radius r Distance d Index Nd Number νd (Object) Infinity Infinity 1 (Stop) Infinity −0.0510 2* 2.4369 0.3986 1.544 55.86 (vd1) 3* 9.0000 0.0927 4* 9.6512 0.4716 1.535 55.66 (vd2) 5* −2.5036 0.3223 6* −0.8138 0.2759 1.661 20.37 (vd3) 7* −1.6670 0.0200 8* 7.4351 0.4583 1.544 55.86 (vd4) 9* −1.7587 0.0200 10* Infinity 0.3458 1.614 25.58 (vd5) 11* Infinity 0.0673 12* 1.0121 0.4133 1.535 55.66 (vd6) 13* 0.6899 0.5000 14 Infinity 0.2100 1.517 64.20 15 Infinity 0.4145 Image Plane Infinity Constituent Lens Data Lens Start Surface Focal Length 1 2 6.011 2 4 3.768 3 6 −2.762 4 8 2.660 5 10 Infinity 6 12 −7.325 Aspheric Surface Data Second Surface Third Surface Fourth Surface Fifth Surface Sixth Surface Seventh Surface k −3.260016E+00 0.000000E+00 −3.782225E+01 −1.826789E+00 −1.081000E+00 0.000000E+00 A4 −7.527715E−02 −2.220918E−01 −1.512366E−01 −1.504052E−01 7.168343E−02 −8.029630E−02 A6 2.319407E−02 −8.729089E−02 −2.817847E−01 1.138025E−02 −7.631071E−01 −3.797023E−01 A8 −2.762643E−01 −6.155922E−01 −1.869433E−01 −3.627602E−01 3.243245E+00 2.386234E+00 A10 0.000000E+00 7.070838E−01 −8.875539E−02 −4.029084E−01 −6.825057E+00 −4.836478E+00 A12 0.000000E+00 0.000000E+00 4.416396E−01 2.133227E+00 7.731701E+00 5.042076E+00 A14 0.000000E+00 0.000000E+00 0.000000E+00 −2.637456E+00 −4.665493E+00 −2.735304E+00 A16 0.000000E+00 0.000000E+00 0.000000E+00 1.077927E+00 1.329231E+00 6.183892E−01 A18 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 A20 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 Eighth Surface Ninth Surface Tenth Surface Eleventh Surface Twelfth Surface Thirteenth Surface k 3.262137E+01 −6.046067E+00 0.000000E+00 0.000000E+00 −1.761221E+00 −4.174866E+00 A4 −5.161471E−01 −1.232851E−01 8.568401E−01 1.246105E+00 −2.136159E−01 −6.128761E−02 A6 1.553392E+00 7.682042E−01 −1.716235E+00 −2.748763E+00 −4.537272E−03 −8.416284E−02 A8 −2.600186E+00 −1.723019E+00 1.863763E+00 3.331651E+00 −1.109148E−01 9.542871E−02 A10 2.835580E+00 2.275904E+00 −1.443339E+00 −2.638124E+00 2.149159E−01 −4.285154E−02 A12 −2.213846E+00 −1.864006E+00 8.795010E−01 1.384832E+00 −1.394310E−01 1.048277E−02 A14 1.186491E+00 8.995568E−01 −4.454881E−01 −4.721943E−01 4.553733E−02 −1.476898E−03 A16 −3.846535E−01 −2.312642E−01 1.634907E−01 9.966285E−02 −8.137865E−03 1.140672E−04 A18 5.504336E−02 2.441071E−02 −3.454872E−02 −1.175873E−02 7.620464E−04 −3.944055E−06 A20 0.000000E+00 0.000000E+00 3.003970E−03 5.906561E−04 −2.935038E−05 2.110647E−08

(46) The imaging lens in Example 3 satisfies conditional expressions (1) to (17) as shown in Table 8.

(47) 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 excellently.

EXAMPLE 4

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

(49) TABLE-US-00004 TABLE 4 Example 4 Unit mm f = 2.47 ih = 3.26 Fno = 1.8 TTL = 3.91 ω(°) = 52.5 Surface Data Surface Curvature Surface Refractive Abbe Number i Radius r Distance d Index Nd Number νd (Object) Infinity Infinity 1 (Stop) Infinity 0.0300 2* 2.6539 0.4608 1.544 55.86 (vd1) 3* −500.3507 0.1044 4* 100.0701 0.4194 1.535 55.66 (vd2) 5* −2.4843 0.3152 6* −0.7912 0.2001 1.661 20.37 (vd3) 7* −1.6698 0.0200 8* 8.3903 0.5924 1.544 55.86 (vd4) 9* −1.4881 0.0200 10* Infinity 0.3013 1.614 25.58 (vd5) 11* Infinity 0.1237 12* 0.9144 0.4126 1.535 55.66 (vd6) 13* 0.6290 0.5000 14 Infinity 0.2100 1.517 64.20 15 Infinity 0.3059 Image Plane Infinity Constituent Lens Data Lens Start Surface Focal Length 1 2 4.852 2 4 4.539 3 6 −2.503 4 8 2.372 5 10 Infinity 6 12 −7.597 Aspheric Surface Data Second Surface Third Surface Fourth Surface Fifth Surface Sixth Surface Seventh Surface k −2.632580E+00 0.000000E+00 0.000000E+00 −7.917237E+00 −1.045405E+00 0.000000E+00 A4 −7.511897E−02 −2.216251E−01 −1.509188E−01 −1.500892E−01 7.153280E−02 −8.012757E−02 A6 2.311290E−02 −8.698540E−02 −2.807985E−01 1.134042E−02 −7.604364E−01 −3.783734E−01 A8 −2.749116E−01 −6.125782E−01 −1.860280E−01 −3.609841E−01 3.227366E+00 2.374550E+00 A10 0.000000E+00 7.026358E−01 −8.819706E−02 −4.003738E−01 −6.782123E+00 −4.806053E+00 A12 0.000000E+00 0.000000E+00 4.382463E−01 2.116837E+00 7.672297E+00 5.003336E+00 A14 0.000000E+00 0.000000E+00 0.000000E+00 −2.613524E+00 −4.623159E+00 −2.710484E+00 A16 0.000000E+00 0.000000E+00 0.000000E+00 1.066649E+00 1.315324E+00 6.119193E−01 A18 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 A20 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 Eighth Surface Ninth Surface Tenth Surface Eleventh Surface Twelfth Surface Thirteenth Surface k 4.042719E+01 −3.636609E+00 0.000000E+00 0.000000E+00 −1.929494E+00 −3.388291E+00 A4 −4.933426E−01 −1.337301E−01 9.546355E−01 1.293156E+00 −2.437873E−01 −9.762711E−02 A6 1.439113E+00 7.387064E−01 −1.772673E+00 −2.747973E+00 3.950192E−03 −6.599258E−02 A8 −2.452508E+00 −1.708771E+00 1.904511E+00 3.308634E+00 −1.120200E−01 9.399156E−02 A10 2.779103E+00 2.303112E+00 −1.488840E+00 −2.632469E+00 2.153171E−01 −4.434269E−02 A12 −2.202493E+00 −1.886041E+00 9.071041E−01 1.385081E+00 −1.396150E−01 1.109211E−02 A14 1.141336E+00 9.077591E−01 −4.495010E−01 −4.722948E−01 4.556846E−02 −1.582081E−03 A16 −3.382970E−01 −2.354152E−01 1.624357E−01 9.964229E−02 −8.139940E−03 1.226534E−04 A18 4.202373E−02 2.562746E−02 −3.582932E−02 −1.174936E−02 7.625235E−04 −4.218023E−06 A20 0.000000E+00 0.000000E+00 3.578610E−03 5.893388E−04 −2.941679E−05 2.268033E−08

(50) The imaging lens in Example 4 satisfies conditional expressions (1) to (17) as shown in Table 8.

(51) 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 excellently.

EXAMPLE 5

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

(53) TABLE-US-00005 TABLE 5 Example 5 Unit mm f = 2.49 ih = 3.26 Fno = 1.8 TTL = 3.91 ω(°) = 52.1 Surface Data Surface Curvature Surface Refractive Abbe Number i Radius r Distance d Index Nd Number νd (Object) Infinity Infinity 1 (Stop) Infinity −0.0300 2* 2.6123 0.4432 1.544 55.86 (vd1) 3* 59.9999 0.1006 4* −5999.9940 0.4177 1.535 55.66 (vd2) 5* −2.3939 0.3248 6* −0.7724 0.2050 1.661 20.37 (vd3) 7* −1.6285 0.0200 8* 8.1679 0.5640 1.544 55.86 (vd4) 9* −1.4563 0.0200 10* Infinity 0.2820 1.614 25.58 (vd5) 11* Infinity 0.1322 12* 0.8988 0.3839 1.535 55.66 (vd6) 13* 0.6285 0.5000 14 Infinity 0.2100 1.517 64.20 15 Infinity 0.3734 Image Plane Infinity Constituent Lens Data Lens Start Surface Focal Length 1 2 5.004 2 4 4.478 3 6 −2.458 4 8 2.319 5 10 Infinity 6 12 −7.741 Aspheric Surface Data Second Surface Third Surface Fourth Surface Fifth Surface Sixth Surface Seventh Surface k −3.702824E+00 0.000000E+00 0.000000E+00 −6.448212E+00 −1.080022E+00 0.000000E+00 A4 −7.527738E−02 −2.220925E−01 −1.512371E−01 −1.504057E−01 7.168365E−02 −8.029654E−02 A6 2.319419E−02 −8.729133E−02 −2.817861E−01 1.138030E−02 −7.631109E−01 −3.797042E−01 A8 −2.762662E−01 −6.155966E−01 −1.869446E−01 −3.627628E−01 3.243268E+00 2.386251E+00 A10 0.000000E+00 7.070902E−01 −8.875619E−02 −4.029120E−01 −6.825119E+00 −4.836522E+00 A12 0.000000E+00 0.000000E+00 4.416444E−01 2.133251E+00 7.731786E+00 5.042131E+00 A14 0.000000E+00 0.000000E+00 0.000000E+00 −2.637490E+00 −4.665554E+00 −2.735339E+00 A16 0.000000E+00 0.000000E+00 0.000000E+00 1.077943E+00 1.329251E+00 6.183985E−01 A18 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 A20 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 Eighth Surface Ninth Surface Tenth Surface Eleventh Surface Twelfth Surface Thirteenth Surface k 3.367314E+01 −3.768192E+00 0.000000E+00 0.000000E+00 −1.948663E+00 −3.298325E+00 A4 −5.004754E−01 −1.192848E−01 9.830686E−01 1.299255E+00 −2.452653E−01 −1.107272E−01 A6 1.469749E+00 7.226936E−01 −1.835626E+00 −2.757331E+00 4.277730E−03 −5.860955E−02 A8 −2.524711E+00 −1.682018E+00 1.989508E+00 3.316366E+00 −1.101479E−01 9.126892E−02 A10 2.871435E+00 2.267117E+00 −1.557904E+00 −2.634591E+00 2.144441E−01 −4.380031E−02 A12 −2.265235E+00 −1.858146E+00 9.354133E−01 1.384890E+00 −1.394668E−01 1.104958E−02 A14 1.163429E+00 8.997934E−01 −4.490824E−01 −4.721300E−01 4.555141E−02 −1.584185E−03 A16 −3.441692E−01 −2.379676E−01 1.579797E−01 9.967033E−02 −8.135783E−03 1.225808E−04 A18 4.340716E−02 2.701494E−02 −3.449233E−02 −1.177166E−02 7.616982E−04 −4.090529E−06 A20 0.000000E+00 0.000000E+00 3.448965E−03 5.920393E−04 −2.935678E−05 1.337399E−08

(54) The imaging lens in Example 5 satisfies conditional expressions (1) to (17) as shown in Table 8.

(55) 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 excellently.

EXAMPLE 6

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

(57) TABLE-US-00006 TABLE 6 Example 6 Unit mm f = 2.50 ih = 3.26 Fno = 1.8 TTL = 3.92 ω(°) = 52.3 Surface Data Surface Curvature Surface Refractive Abbe Number i Radius r Distance d Index Nd Number νd (Object) Infinity Infinity 1 (Stop) Infinity −0.0300 2* 2.6952 0.4499 1.544 55.86 (vd1) 3* −500.0000 0.0992 4* −236.5491 0.4213 1.535 55.66 (vd2) 5* −2.4152 0.3264 6* −0.7681 0.2000 1.661 20.37 (vd3) 7* −1.6067 0.0200 8* 7.8466 0.5631 1.544 55.86 (vd4) 9* −1.4775 0.0200 10* Infinity 0.2889 1.614 25.58 (vd5) 11* Infinity 0.1274 12* 0.9109 0.3914 1.535 55.66 (vd6) 13* 0.6369 0.5000 14 Infinity 0.2100 1.517 64.20 15 Infinity 0.3697 Image Plane Infinity Constituent Lens Data Lens Start Surface Focal Length 1 2 4.927 2 4 4.560 3 6 −2.461 4 8 2.334 5 10 Infinity 6 12 −7.879 Aspheric Surface Data Second Surface Third Surface Fourth Surface Fifth Surface Sixth Surface Seventh Surface k −4.497389E+00 0.000000E+00 0.000000E+00 −6.219467E+00 −1.064692E+00 0.000000E+00 A4 −7.527715E−02 −2.220918E−01 −1.512366E−01 −1.504052E−01 7.168343E−02 −8.029630E−02 A6 2.319407E−02 −8.729089E−02 −2.817847E−01 1.138025E−02 −7.631071E−01 −3.797023E−01 A8 −2.762643E−01 −6.155922E−01 −1.869433E−01 −3.627602E−01 3.243245E+00 2.386234E+00 A10 0.000000E+00 7.070838E−01 −8.875539E−02 −4.029084E−01 −6.825057E+00 −4.836478E+00 A12 0.000000E+00 0.000000E+00 4.416396E−01 2.133227E+00 7.731701E+00 5.042076E+00 A14 0.000000E+00 0.000000E+00 0.000000E+00 −2.637456E+00 −4.665493E+00 −2.735304E+00 A16 0.000000E+00 0.000000E+00 0.000000E+00 1.077927E+00 1.329231E+00 6.183892E−01 A18 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 A20 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 Eighth Surface Ninth Surface Tenth Surface Eleventh Surface Twelfth Surface Thirteenth Surface k 3.360683E+01 −3.721259E+00 0.000000E+00 0.000000E+00 −1.879843E+00 −3.336148E+00 A4 −5.054708E−01 −1.270644E−01 9.605790E−01 1.288821E+00 −2.477514E−01 −1.049799E−01 A6 1.483371E+00 7.519021E−01 −1.791143E+00 −2.753188E+00 5.308238E−03 −6.111112E−02 A8 −2.528776E+00 −1.705370E+00 1.923993E+00 3.316318E+00 −1.109453E−01 9.174578E−02 A10 2.872815E+00 2.277352E+00 −1.501562E+00 −2.635934E+00 2.145576E−01 −4.378499E−02 A12 −2.285687E+00 −1.864225E+00 9.104191E−01 1.385387E+00 −1.394541E−01 1.103457E−02 A14 1.185696E+00 8.981698E−01 −4.468369E−01 −4.721497E−01 4.555319E−02 −1.582184E−03 A16 −3.492906E−01 −2.325064E−01 1.593117E−01 9.963342E−02 −8.136690E−03 1.219252E−04 A18 4.255337E−02 2.514587E−02 −3.468565E−02 −1.175503E−02 7.617190E−04 −3.933179E−06 A20 0.000000E+00 0.000000E+00 3.449503E−03 5.896842E−04 −2.935663E−05 1.801413E−09

(58) The imaging lens in Example 6 satisfies conditional expressions (1) to (17) as shown in Table 8.

(59) FIG. 12 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 6. As shown in FIG. 12, each aberration is corrected excellently.

EXAMPLE 7

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

(61) TABLE-US-00007 TABLE 7 Example 7 Unit mm f = 2.81 ih = 3.26 Fno = 1.8 TTL = 4.25 ω(°) = 50.0 Surface Data Surface Curvature Surface Refractive Abbe Number i Radius r Distance d Index Nd Number νd (Object) Infinity Infinity 1 (Stop) Infinity −0.0325 2* 2.6482 0.4779 1.544 55.86 (vd1) 3* 21.3167 0.2448 4* 4.4669 0.4057 1.535 55.66 (vd2) 5* −26.3020 0.2268 6* −2.0213 0.3000 1.661 20.37 (vd3) 7* −13.4597 0.0208 8* −10.3341 0.4783 1.544 55.86 (vd4) 9* −2.0235 0.0200 10* Infinity 0.3600 1.661 20.37 (vd5) 11* Infinity 0.0264 12* 0.7824 0.4857 1.535 55.66 (vd6) 13* 0.6782 0.5000 14 Infinity 0.2100 1.517 64.20 15 Infinity 0.5669 Image Plane Infinity Constituent Lens Data Lens Start Surface Focal Length 1 2 5.506 2 4 7.173 3 6 −3.638 4 8 4.531 5 10 Infinity 6 12 15.253 Aspheric Surface Data Second Surface Third Surface Fourth Surface Fifth Surface Sixth Surface Seventh Surface k 2.472955E+00 0.000000E+00 −1.000000E+00 −9.999999E−01 −1.000000E+00 0.000000E+00 A4 −9.148951E−02 −1.626906E−01 −1.643676E−01 −1.499051E−01 −5.784550E−01 −2.334739E−02 A6 −1.003969E−02 −1.270262E−01 −1.405476E−02 −8.795773E−03 1.580392E+00 −2.640383E−02 A8 −1.175108E−01 6.505164E−02 −4.758153E−01 −5.995714E−01 −4.789919E+00 −1.621203E+00 A10 0.000000E+00 −2.950093E−02 3.913980E−01 6.759232E−01 9.854858E+00 4.023703E+00 A12 0.000000E+00 0.000000E+00 0.000000E+00 −1.271616E−01 −1.118269E+01 −3.926083E+00 A14 0.000000E+00 0.000000E+00 0.000000E+00 2.139518E−02 6.626144E+00 1.752123E+00 A16 0.000000E+00 0.000000E+00 0.000000E+00 −3.626468E−02 −1.604280E+00 −2.944286E−01 A18 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 A20 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 Eighth Surface Ninth Surface Tenth Surface Eleventh Surface Twelfth Surface Thirteenth Surface k −1.232784E+01 −3.360798E+01 0.000000E+00 0.000000E+00 −2.148448E+00 −2.508419E+00 A4 6.137630E−01 −2.488437E−01 7.583641E−01 5.726725E−01 −2.862441E−01 −2.262405E−01 A6 −1.040908E+00 1.208180E+00 −1.191706E+00 −7.104699E−01 4.475700E−02 1.007643E−01 A8 8.735916E−01 −1.912512E+00 1.064228E+00 4.208414E−01 1.595003E−02 −2.624835E−02 A10 −4.017928E−01 1.470622E+00 −6.563438E−01 −1.561038E−01 −5.046308E−03 3.943571E−03 A12 8.951159E−02 −6.019950E−01 2.467789E−01 3.653295E−02 2.044365E−04 −3.099407E−04 A14 −2.211894E−03 1.267435E−01 −4.839913E−02 −4.788211E−03 5.760857E−05 7.457861E−06 A16 −2.863722E−03 −1.088079E−02 3.723050E−03 2.605478E−04 −4.902575E−06 2.946515E−07 A18 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 A20 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00

(62) The imaging lens in Example 7 satisfies conditional expressions (1) to (17) as shown in Table 8.

(63) FIG. 14 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 7. As shown in FIG. 14, each aberration is corrected excellently.

(64) In table 8, values of conditional expressions (1) to (17) related to the Examples 1 to 7 are shown.

(65) TABLE-US-00008 TABLE 8 Conditional Expression Example1 Example2 Example3 Example4 Example5 Example6 Example7 (1) vd4/vd5 2.18 2.18 2.18 2.18 2.18 2.18 2.74 (2) (T3/TTL)*100 0.63 0.49 0.51 0.51 0.51 0.51 0.49 (3) vd1/(vd2 + vd3) 0.73 0.73 0.73 0.73 0.73 0.73 0.73 (4) f1/f 2.51 2.34 2.32 1.97 2.01 1.97 1.96 (5) f2/f 1.20 1.42 1.45 1.84 1.79 1.82 2.56 (6) f3/f −0.99 −0.95 −1.07 −1.01 −0.99 −0.98 −1.30 (7) f4/f 1.31 1.18 1.03 0.96 0.93 0.93 1.61 (8) |f6|/f 12.47 14.96 2.83 3.08 3.10 3.15 5.43 (9) D6/ΣD 0.20 0.22 0.17 0.17 0.17 0.17 0.19 (10) Σ(L1F − L6R)/f 1.10 1.16 1.11 1.20 1.16 1.16 1.09 (11) r5/r6 0.50 0.49 0.49 0.47 0.47 0.48 0.15 (12) r11/f 0.40 0.38 0.39 0.37 0.36 0.36 0.28 (13) r12/f 0.32 0.30 0.27 0.25 0.25 0.25 0.24 (14) Fno 1.80 1.80 1.80 1.80 1.80 1.80 1.80 (15) f2/f4 0.92 1.20 1.42 1.91 1.93 1.95 1.58 (16) T3/T4 0.87 1.00 1.00 1.00 1.00 1.00 1.04 (17) (D5/TTL)*100 8.76 8.89 8.78 7.70 7.22 7.38 8.47

(66) When the imaging lens according to the present invention is adopted to a product with the camera function, there is realized contribution to the low-profileness and the low F-number of the camera and also high performance thereof.

DESCRIPTION OF REFERENCE NUMERALS

(67) ST: aperture stop,

(68) L1: first lens,

(69) L2: second lens,

(70) L3: third lens,

(71) L4: fourth lens,

(72) L5: fifth lens,

(73) L6: sixth lens,

(74) IMG: image plane,

(75) IR: filter, and

(76) ih: maximum image height.

Imaging lens

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Inventors

Cpc classification

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G02B13/18

PHYSICS

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H04N23/55

ELECTRICITY

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G02B13/002

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G02B5/005

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G02B3/04

PHYSICS

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G02B9/60

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G02B13/0045

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G02B9/62

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International classification

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G02B9/62

PHYSICS

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G02B13/00

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G02B9/60

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H04N23/55

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Abstract

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Description