Imaging lens

Abstract

There is provided an imaging lens with excellent optical characteristics which satisfies demand of wide field of view, low profile and low F-number. An imaging lens comprises, in order from an object side to an image side, a first lens with positive or negative refractive power in a paraxial region, a second lens with positive or negative refractive power in a paraxial region, a third lens with positive refractive power in a paraxial region, a fourth lens with negative refractive power in a paraxial region, a fifth lens with positive refractive power in a paraxial region, a sixth lens with positive refractive power in a paraxial region, and a seventh lens with negative refractive power.

Claims

1. An imaging lens comprising in order from an object side to an image side, a first lens with positive or negative refractive power in a paraxial region, a second lens with positive or negative refractive power in a paraxial region, a third lens with positive refractive power in a paraxial region, a fourth lens with negative refractive power in a paraxial region, a fifth lens with positive refractive power in a paraxial region, a sixth lens with positive refractive power in a paraxial region, and a seventh lens with negative refractive power, wherein an image-side surface of said first lens is convex in the paraxial region, an object-side surface of said second lens is convex in the paraxial region, and an image-side surface of said sixth lens is concave in the paraxial region.

2. The imaging lens according to claim 1, wherein an object-side surface of said first lens is concave in the paraxial region.

3. The imaging lens according to claim 1, wherein an object-side surface of said fourth lens is concave in the paraxial region.

4. The imaging lens according to claim 1, wherein an image-side surface of said fourth lens is convex in the paraxial region.

5. The imaging lens according to claim 1, wherein an object-side surface of said sixth lens is convex in the paraxial region.

6. The imaging lens according to claim 1, wherein the following conditional expression (1) is satisfied:
0.10<(T1/TTL)×100<0.45  (1) where T1: a distance along the optical axis from an image-side surface of the first lens to an object-side surface of the second lens, and TTL: a total track length.

7. The imaging lens according to claim 1, wherein the following conditional expression (2) is satisfied:
10.00<T2/T4  (2) where T2: a distance along the optical axis from an image-side surface of the second lens to an object-side surface of the third lens, and T4: a distance along the optical axis from an image-side surface of the fourth lens to an object-side surface of the fifth lens.

8. An imaging lens comprising in order from an object side to an image side, a first lens with positive or negative refractive power in a paraxial region, a second lens with positive or negative refractive power in a paraxial region, a third lens with positive refractive power in a paraxial region, a fourth lens with negative refractive power in a paraxial region, a fifth lens with positive refractive power in a paraxial region, a sixth lens with positive refractive power in a paraxial region, and a seventh lens with negative refractive power, wherein an object-side surface of said first lens is concave in the paraxial region, an image-side surface of said seventh lens is concave in the paraxial region, and the following conditional expression (3) is satisfied:
13.00<vd6<25.50  (3) where vd6: an abbe number at d-ray of the sixth lens.

9. The imaging lens according to claim 8, wherein an image-side surface of said second lens is concave in a paraxial region.

10. The imaging lens according to claim 8, wherein an object-side surface of said fourth lens is concave in a paraxial region.

11. The imaging lens according to claim 8, wherein an image-side surface of said sixth lens is concave in a paraxial region.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic view showing 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 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 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 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 an imaging lens in Example 5 according to the present invention; and

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

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

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

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

(13) The imaging lens according to the present embodiment comprises, in order from an object side to an image side, a first lens L1 with positive or negative refractive power in a paraxial region, a second lens L2 with positive or negative refractive power in a paraxial region, a third lens L3 with positive refractive power in a paraxial region, a fourth lens L4 with negative refractive power in a paraxial region, a fifth lens L5 with positive refractive power in a paraxial region, a sixth lens L6 with positive refractive power in a paraxial region, and a seventh lens L7 with negative refractive power.

(14) A filter IR such as an IR cut filter and a cover glass are arranged between the seventh lens L7 and an image plane IMG (namely, the image plane of an image sensor). The filter IR is omissible.

(15) An aperture stop ST is arranged between the second lens L2 and the third lens L3, and symmetry is created with the aperture stop ST. As a result, the distortion which may be increased due to the wide field of view can be suppressed.

(16) The first lens L1 has the positive refractive power and has a meniscus shape having an object-side surface being concave and an image-side surface being convex in the paraxial region. Therefore, the astigmatism and the distortion are properly corrected.

(17) The refractive power of the first lens L1 may be negative as in the Example 5 shown in FIG. 9. This case is favorable for correction of the chromatic aberration.

(18) The second lens L2 has the negative refractive power and has a meniscus shape having an object-side surface being convex and an image-side surface being concave in the paraxial region. Therefore, the coma aberration, the astigmatism, the field curvature and the distortion are properly corrected.

(19) The refractive power of the second lens L2 may be positive as in the Example 5 shown in FIG. 9. This case is favorable for reduction in the profile.

(20) The third lens L3 has the positive refractive power and has a biconvex shape having convex surfaces facing the object side and the image side in the paraxial region. Therefore, reduction in the profile is achieved and the spherical aberration, the field curvature and the distortion are properly corrected by the positive refractive power on both sides.

(21) The fourth lens L4 has the negative refractive power and has a meniscus shape having an object-side surface being concave and an image-side surface being convex in the paraxial region. Therefore, the astigmatism, the distortion and the chromatic aberration are properly corrected.

(22) The fifth lens L5 has the positive refractive power and has a meniscus shape having an object-side surface being concave and an image-side surface being convex in the paraxial region. Therefore, reduction in the profile is achieved and the astigmatism and the distortion are properly corrected.

(23) The sixth lens L6 has the positive refractive power and has a meniscus shape having an object-side surface being convex and an image-side surface being concave in the paraxial region. Therefore, reduction in the profile is achieved and the coma aberration, the astigmatism, the field curvature and the distortion are properly corrected.

(24) The image-side surface of the sixth lens L6 is formed as an aspheric surface having at least one pole point in a position off an optical axis X. Therefore, the astigmatism, the field curvature and the distortion are properly corrected.

(25) The seventh lens L7 has the negative refractive power and has a meniscus shape having an object-side surface being convex and an image-side surface being concave in the paraxial region. Therefore, the chromatic aberration, the astigmatism, the field curvature and the distortion are properly corrected.

(26) The object-side surface of the seventh lens L7 is formed as an aspheric surface having at least one pole point in a position off the optical axis X. Therefore, the astigmatism, the field curvature and the distortion are properly corrected.

(27) Regarding the imaging lens according to the present embodiments, it is preferable that all lenses of the first lens L1 to the seventh lens L7 are single lenses. Configuration only with the single lenses can frequently use the aspheric surfaces. In the present embodiments, all lens surfaces are formed as appropriate aspheric surfaces, and the aberrations are favorably corrected. Furthermore, in comparison with a case in which a cemented lens is used, workload is reduced, and manufacturing in low cost becomes possible.

(28) Furthermore, the imaging lens according to the present embodiments makes manufacturing facilitated by using a plastic material for all of the lenses, and mass production in a low cost can be realized.

(29) The material applied to the lens is not limited to the plastic material. By using glass material, further high performance may be aimed. It is preferable that all of lens-surfaces are formed as aspheric surfaces, however, spherical surfaces easy to be manufactured may be adopted in accordance with required performance.

(30) The imaging lens according to the present embodiments shows preferable effect by satisfying the following conditional expressions (1) to (16).
0.10<(T1/TTL)×100<0.45  (1)
10.00<T2/T4  (2)
13.00<vd6<25.50  (3)
0.10<vd6/vd7<0.60  (4)
0.20<(D1/|f1|)×100<7.50  (5)
0.10<(T4/TTL)×100<0.40  (6)
0.01<T1/T2<0.06  (7)
0.40<f3/f<1.75  (8)
−1.65<f4/f<−0.50  (9)
0.50<f5/f<3.00  (10)
−1.40<f5/f7<−0.30  (11)
−6.50<r1/f<−0.50  (12)
−2.00<r2/f<−0.40  (13)
0.10<r11/f<0.65  (14)
0.10<r12/f<0.65  (15)
3.50<r13/f  (16)

(31) where

(32) vd6: an abbe number at d-ray of the sixth lens L6,

(33) vd7: an abbe number at d-ray of the seventh lens L7,

(34) D1: a thickness of the first lens L1 along the optical axis X,

(35) T1: a distance along the optical axis X from an image-side surface of the first lens L1 to an object-side surface of the second lens L2,

(36) T2: a distance along the optical axis X from an image-side surface of the second lens L2 to an object-side surface of the third lens L3,

(37) T4: a distance along the optical axis X from an image-side surface of the fourth lens L4 to an object-side surface of the fifth lens L5,

(38) f: a focal length of the overall optical system of the imaging lens,

(39) TTL: a total track length,

(40) f1: a focal length of the first lens L1,

(41) f3: a focal length of the third lens L3,

(42) f4: a focal length of the fourth lens L4,

(43) f5: a focal length of the fifth lens L5,

(44) f7: a focal length of the seventh lens L7,

(45) r1: a paraxial curvature radius of an object-side surface of the first lens L1,

(46) r2: a paraxial curvature radius of an image-side surface of the first lens L1,

(47) r11: a paraxial curvature radius of an object-side surface of the sixth lens L6,

(48) r12: a paraxial curvature radius of an image-side surface of the sixth lens L6, and

(49) r13: a paraxial curvature radius of an object-side surface of the seventh lens L7.

(50) 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.

(51) The imaging lens according to the present embodiments shows further preferable effect by satisfying the following conditional expressions (1a) to (16a).
0.15<(T1/TTL)×100<0.35  (1a)
20.00<T2/T4<60.00  (2a)
16.00<vd6<22.50  (3a)
0.20<vd6/vd7<0.45  (4a)
0.35<(D1/|f1|)×100<6.50  (5a)
0.15<(T4/TTL)×100<0.30  (6a)
0.02<T1/T2<0.04  (7a)
0.70<f3/f<1.40  (8a)
−1.30<f4/f<−0.70  (9a)
0.90<f5/f<2.40  (10a)
−1.15<f5/f7<−0.45  (11a)
−5.50<r1/f<−0.85  (12a)
−1.65<r2/f<−0.75  (13a)
0.25<r11/f<0.55  (14a)
0.25<r12/f<0.55  (15a)
5.50<r13/f<35.00  (16a)

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

(53) In this embodiment, the aspheric shapes of the aspheric surfaces of the 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 paraxial curvature radius, k denotes a conic constant, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 denote aspheric surface coefficients.

(54) $\begin{array}{cc}Z=\frac{\frac{H^2}{R}}{1+\sqrt{1-\left(k+1\right)\frac{H^2}{R^2}}}+A_4{H}^4+A_6{H}^6+A_8{H}^8+A_{10}{H}^{10}+A_{12}{H}^{12}+A_{14}{H}^{14}+A_{16}{H}^{16}+A_{18}{H}^{18}+A_{20}{H}^{20}& \left[\mathrm{Equation}1\right]\end{array}$

(55) 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 a F-number, ω denotes a half field of view, ih denotes a maximum image height, and TTL denotes a total track length. Additionally, i denotes surface number counted from the object side, r denotes the paraxial 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

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

(57) TABLE-US-00001 TABLE 1 Example 1 Unit mm f = 4.40 Fno = 1.80 ω(°) = 50.0 ih = 5.20 TTL = 6.81 Surface Data i r d Nd vd (Object) Infinity Infinity   1* −18.31833 0.5363 1.544 56.44 (vd1)   2* −4.3296 0.0150   3* 2.0327 0.2543 1.671 19.24 (vd2)   4* 1.6764 0.3186       5 (Stop) Infinity 0.2399  6* 8.1488 0.7530 1.535 55.69 (vd3)  7* −3.0253 0.7547  8* −1.7732 0.3500 1.671 19.24 (vd4)  9* −5.6805 0.0150  10* −11.4884 0.6916 1.544 56.44 (vd5)  11* −2.6165 0.0779  12* 1.8561 0.6683 1.671 19.24 (vd6)  13* 1.8256 0.5323  14* 67.2594 0.7000 1.535 55.69 (vd7)  15* 4.3517 0.3000 18 Infinity 0.2100 1.517 64.20 19 Infinity 0.4683 Image Infinity Plane Constituent Lens Data Lens Start Surface Focal Length 1 1 10.275 2 3 −19.987 3 6 4.224 4 8 −3.987 5 10 6.057 6 12 21.241 7 14 −8.734 Aspheric Surface Data First Surface Second Surface Third Surface Fourth Surface Sixth Surface Seventh Surface Eighth Surface k 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 9.000717E−01 0.000000E+00 A4 4.352318E−02 1.400658E−01 −1.016769E−01 −2.459534E−01 −1.012073E−02 −1.484676E−02 −2.450785E−01 A6 −2.570791E−02 −1.587644E−01 4.207642E−02 3.400388E−01 −2.531432E−02 −8.476290E−02 5.758108E−01 A8 2.270658E−02 1.993450E−01 −2.969465E−02 −6.717588E−01 4.584522E−02 1.983986E−01 −8.833610E−01 A10 −1.360302E−02 −1.885454E−01 −1.133162E−02 1.024063E+00 −1.055811E−01 −2.850534E−01 9.367597E−01 A12 5.111489E−03 1.217470E−01 1.463979E−02 −1.122043E+00 1.413100E−01 2.278253E−01 −6.343156E−01 A14 −1.128390E−03 −5.154930E−02 −2.965517E−03 7.920591E−01 −1.118800E−01 −9.594362E−02 2.740607E−01 A16 1.292338E−04 1.357270E−02 0.000000E+00 −3.150130E−01 4.685000E−02 1.664060E−02 −7.336141E−02 A18 −5.693576E−06 −2.009014E−03 0.000000E+00 5.402590E−02 −7.500000E−03 0.000000E+00 1.109234E−02 A20 0.000000E+00 1.278137E−04 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 −7.226242E−04 Ninth Surface Tenth Surface Eleventh Surface Twelfth Surface Thirteenth Surface Fourteenth Surface Fifteenth Surface k 0.000000E+00 0.000000E+00 0.000000E+00 −1.207492E+01 −1.279020E+01 0.000000E+00 0.000000E+00 A4 −2.104027E−01 2.086563E−01 1.297117E−01 2.007272E−02 −3.414990E−02 −1.669531E−01 −9.565677E−02 A6 3.228967E−01 −3.031397E−01 −6.758516E−02 −6.728555E−02 5.173859E−03 8.933056E−02 3.723726E−02 A8 −4.406933E−01 2.889087E−01 3.617232E−02 5.267599E−02 −3.726498E−03 −2.674713E−02 −8.530022E−03 A10 3.992593E−01 −2.027089E−01 −2.326443E−02 −2.962420E−02 1.385240E−03 4.938204E−03 1.207961E−03 A12 −2.236503E−01 1.008357E−01 1.089174E−02 1.055083E−02 −2.632963E−04 −5.781292E−04 −1.111231E−04 A14 7.897667E−02 −3.392703E−02 −3.001693E−03 −2.278530E−03 3.036890E−05 4.308748E−05 6.653120E−06 A16 −1.732064E−02 7.285051E−03 4.708479E−04 2.934971E−04 −2.236793E−06 −1.984476E−06 −2.501938E−07 A18 2.170105E−03 −8.993428E−04 −3.931747E−05 −2.098575E−05 9.816897E−08 5.155942E−08 5.381537E−09 A20 −1.192368E−04 4.841597E−05 1.365111E−06 6.452233E−07 −1.950232E−09 −5.784404E−10 −5.085610E−11

(58) The imaging lens in Example 1 satisfies conditional expressions (1) to (16) as shown in Table 6.

(59) 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 each wavelength 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 (solid line) and on tangential image surface T (broken line), respectively (same as FIGS. 4, 6, 8 and 10). As shown in FIG. 2, each aberration is corrected excellently.

Example 2

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

(61) TABLE-US-00002 TABLE 2 Example 2 Unit mm f = 4.41 Fno = 1.80 ω(°) = 50.0 ih = 5.20 TTL = 6.81 Surface Data i r d Nd vd (Object) Infinity Infinity  1* −12.74477 0.5015 1.544 56.44 (vd1)  2* −4.3246 0.0150  3* 2.1593 0.2813 1.671 19.24 (vd2)  4* 1.8116 0.3074     5 (Stop) Infinity 0.2442  6* 7.4741 0.7412 1.535 55.69 (vd3)  7* −3.2203 0.7507  8* −1.7795 0.3500 1.671 19.24 (vd4)  9* −5.0587 0.0150  10* −9.7959 0.6622 1.544 56.44 (vd5)  11* −2.7143 0.1024  12* 1.7978 0.6743 1.671 19.24 (vd6)  13* 1.7958 0.5613  14* 73.2503 0.7000 1.535 55.69 (vd7)  15* 4.3238 0.3000 18 Infinity 0.2100 1.517 64.20 19 Infinity 0.4656 Image Infinity Plane Constituent Lens Data Lens Start Surface Focal Length 1 1 11.775 2 3 −24.840 3 6 4.312 4 8 −4.276 5 10 6.676 6 12 17.910 7 14 −8.622 Aspheric Surface Data First Surface Second Surface Third Surface Fourth Surface Sixth Surface Seventh Surface Eighth Surface k 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 1.123803E+00 0.000000E+00 A4 4.822204E−02 1.238152E−01 −9.246960E−02 −2.138569E−01 −4.597134E−03 −1.459368E−02 −2.487210E−01 A6 −3.047816E−02 −1.242797E−01 3.785001E−02 2.906004E−01 −4.604110E−02 −8.007266E−02 5.870906E−01 A8 2.806135E−02 1.511784E−01 −2.447287E−02 −5.812192E−01 1.045818E−01 1.791244E−01 −9.195702E−01 A10 −1.774890E−02 −1.417169E−01 −8.751071E−03 9.063400E−01 −2.001016E−01 −2.509250E−01 9.830679E−01 A12 7.075938E−03 9.049165E−02 1.092771E−02 −9.938439E−01 2.319291E−01 1.955692E−01 −6.687810E−01 A14 −1.683214E−03 −3.770518E−02 −2.111448E−03 6.899794E−01 −1.619545E−01 −8.034718E−02 2.912141E−01 A16 2.144430E−04 9.718197E−03 0.000000E+00 −2.672481E−01 6.111053E−02 1.357131E−02 −7.904081E−02 A18 −1.114180E−05 −1.400959E−03 0.000000E+00 4.437563E−02 −9.166654E−03 0.000000E+00 1.220902E−02 A20 0.000000E+00 8.642418E−05 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 −8.194976E−04 Ninth Surface Tenth Surface Eleventh Surface Twelfth Surface Thirteenth Surface Fourteenth Surface Fifteenth Surface k 0.000000E+00 0.000000E+00 0.000000E+00 −1.249258E+01 −1.203034E+01 0.000000E+00 0.000000E+00 A4 −1.964190E−01 2.233087E−01 9.595804E−02 2.015835E−02 −3.041018E−02 −1.667037E−01 −1.026345E−01 A6 3.265758E−01 −3.004585E−01 −1.260447E−02 −6.718249E−02 1.172580E−03 8.932001E−02 4.066956E−02 A8 −4.849883E−01 2.628373E−01 −1.135636E−02 5.351071E−02 −1.225331E−03 −2.674738E−02 −9.501114E−03 A10 4.597789E−01 −1.710114E−01 9.863176E−04 −3.100505E−02 5.205389E−04 4.938191E−03 1.382461E−03 A12 −2.667196E−01 8.039827E−02 3.272355E−03 1.155688E−02 −7.275631E−05 −5.781293E−04 −1.314158E−04 A14 9.759917E−02 −2.589738E−02 −1.501589E−03 −2.642700E−03 2.310448E−06 4.308751E−05 8.168719E−06 A16 −2.223709E−02 5.361293E−03 2.884396E−04 3.626125E−04 4.116208E−07 −1.984479E−06 −3.202712E−07 A18 2.899090E−03 −6.409280E−04 −2.662980E−05 −2.761952E−05 −4.446417E−08 5.155971E−08 7.207500E−09 A20 −1.657501E−04 3.351100E−05 9.737072E−07 9.000774E−07 1.344553E−09 −5.784314E−10 −7.138470E−11

(62) The imaging lens in Example 2 satisfies conditional expressions (1) to (16) as shown in Table 6.

(63) 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

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

(65) TABLE-US-00003 TABLE 3 Example 3 Unit mm f = 4.40 Fno = 1.80 ω(°) = 50.3 ih = 5.20 TTL = 6.81 Surface Data i r d Nd vd (Object) Infinity Infinity  1* −12.96325 0.5075 1.544 56.44 (vd1)  2* −4.4257 0.0150  3* 2.3397 0.3079 1.671 19.24 (vd2)  4* 1.9283 0.288    5 (Stop) Infinity 0.2600  6* 7.0615 0.7678 1.535 55.69 (vd3)  7* −3.1896 0.7176  8* −1.7928 0.3501 1.671 19.24 (vd4)  9* −4.8142 0.0150  10* −17.8554 0.6468 1.544 56.44 (vd5)  11* −3.1430 0.1772  12* 1.6163 0.5695 1.671 19.24 (vd6)  13* 1.5840 0.5707  14* 60.435 0.7000 1.535 55.69 (vd7)  15* 4.3189 0.3000 18 Infinity 0.2100 1.517 64.20 19 Infinity 0.4682 Image Infinity Plane Constituent Lens Data Lens Start Surface Focal Length 1 1 12.089 2 3 −23.380 3 6 4.218 4 8 −4.466 5 10 6.899 6 12 19.436 7 14 −8.734 Aspheric Surface Data First Surface Second Surface Third Surface Fourth Surface Sixth Surface Seventh Surface Eighth Surface k 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 1.160080E+00 0.000000E+00 A4 4.524570E−02 1.232449E−01 −6.563795E−02 −1.788268E−01 −6.306931E−03 −1.940203E−02 −2.447296E−01 A6 −2.477181E−02 −1.260414E−01 −3.235814E−03 1.888867E−01 −2.978411E−02 −5.573360E−02 5.765549E−01 A8 1.961904E−02 1.411829E−01 1.729026E−02 −2.714651E−01 4.484594E−02 1.219389E−01 −8.833727E−01 A10 −1.092245E−02 −1.191134E−01 −2.986169E−02 2.699365E−01 −7.505540E−02 −1.720386E−01 9.117280E−01 A12 3.863679E−03 6.887520E−02 1.619045E−02 −1.741839E−01 7.983201E−02 1.327834E−01 −5.962258E−01 A14 −8.106966E−04 −2.635316E−02 −2.687343E−03 6.438229E−02 −5.613797E−02 −5.371068E−02 2.488271E−01 A16 8.793756E−05 6.313591E−03 0.000000E+00 −9.174040E−03 2.200093E−02 8.885905E−03 −6.439588E−02 A18 −3.605753E−06 −8.528650E−04 0.000000E+00 0.000000E+00 −3.311400E−03 0.000000E+00 9.402568E−03 A20 0.000000E+00 4.951942E−05 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 −5.890989E−04 Ninth Surface Tenth Surface Eleventh Surface Twelfth Surface Thirteenth Surface Fourteenth Surface Fifteenth Surface k 0.000000E+00 0.000000E+00 0.000000E+00 −1.029164E−01 −1.016349E+01 0.000000E+00 0.000000E+00 A4 −1.907674E−01 1.990556E−01 8.264007E−02 1.425841E−02 −2.434390E−02 −1.657659E−01 −9.971469E−02 A6 3.298917E−01 −2.298531E−01 3.069952E−02 −4.179367E−02 −2.718155E−03 8.927413E−02 3.949802E−02 A8 −4.810124E−01 1.707564E−01 −6.067394E−02 2.296710E−02 −5.721783E−04 −2.675007E−02 −9.147045E−03 A10 4.369755E−01 −9.939413E−02 3.359879E−02 −1.052842E−02 5.451369E−04 4.938124E−03 1.308910E−03 A12 −2.408871E−01 4.469144E−02 −1.027226E−02 3.178948E−03 −1.214556E−04 −5.781267E−04 −1.218540E−04 A14 8.308700E−02 −1.450079E−02 1.967455E−03 −5.772426E−04 1.547402E−05 4.308800E−05 7.405286E−06 A16 −1.768828E−02 3.114872E−03 −2.398809E−04 6.518515E−05 −1.199657E−06 −1.984441E−06 −2.838135E−07 A18 2.138053E−03 −3.920862E−04 1.719869E−05 −4.574740E−06 4.700516E−08 5.156073E−08 6.249697E−09 A20 −1.127000E−04 2.167066E−05 −5.521979E−07 1.567767E−07 −5.612048E−10 −5.786064E−10 −6.071220E−11

(66) The imaging lens in Example 3 satisfies conditional expressions (1) to (16) as shown in Table 6.

(67) 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

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

(69) TABLE-US-00004 TABLE 4 Example 4 Unit mm f = 4.41 Fno = 1.80 ω(°) = 50.2 ih = 5.20 TTL = 6.82 Surface Data i r d Nd vd (Object) Infinity Infinity  1* −15.4139 0.5123 1.544 56.44 (vd1)  2* −4.7303 0.0150  3* 2.3460 0.3156 1.671 19.24 (vd2)  4* 1.9483 0.3086    5 (Stop) Infinity 0.2626  6* 6.7906 0.7801 1.535 55.69 (vd3)  7* −3.2869 0.6836  8* −1.7972 0.3645 1.671 19.24 (vd4)  9* −4.6350 0.0150  10* −37.303 0.6164 1.544 56.44 (vd5)  11* −3.9127 0.2262  12* 1.5339 0.5613 1.671 19.24 (vd6)  13* 1.5538 0.5432  14* 62.5975 0.7000 1.535 55.69 (vd7)  15* 4.3607 0.3000 18 Infinity 0.2100 1.517 64.20 19 Infinity 0.4722 Image Infinity Plane Constituent Lens Data Lens Start Surface Focal Length 1 1 12.327 2 3 −25.147 3 6 4.256 4 8 −4.614 5 10 7.975 6 12 14.488 7 14 −8.801 Aspheric Surface Data First Surface Second Surface Third Surface Fourth Surface Sixth Surface Seventh Surface Eighth Surface k 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 1.556592E+00 0.000000E+00 A4 4.426394E−02 1.187962E−01 −6.004227E−02 −1.706298E−01 −8.577157E−03 −2.397334E−02 −2.317078E−01 A6 −2.327995E−02 −1.157073E−01 −4.608720E−03 1.864010E−01 −3.027017E−02 −5.064464E−02 5.525204E−01 A8 1.829555E−02 1.244525E−01 1.910371E−02 −2.779818E−01 5.650167E−02 1.108672E−01 −8.938362E−01 A10 −1.011861E−02 −1.006579E−01 −2.824778E−02 2.962251E−01 −1.060082E−01 −1.577207E−01 9.713274E−01 A12 3.539015E−03 5.567959E−02 1.455481E−02 −2.034976E−01 1.232576E−01 1.229118E−01 −6.635227E−01 A14 −7.346701E−04 −2.043410E−02 −2.343790E−03 7.909669E−02 −9.055756E−02 −5.020709E−02 2.874009E−01 A16 7.868983E−05 4.704485E−03 0.000000E+00 −1.192825E−02 3.651721E−02 8.394567E−03 −7.675993E−02 A18 −3.206694E−06 −6.106044E−04 0.000000E+00 0.000000E+00 −5.821089E−03 0.000000E+00 1.151602E−02 A20 0.000000E+00 3.398842E−05 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 −7.398392E−04 Ninth Surface Tenth Surface Eleventh Surface Twelfth Surface Thirteenth Surface Fourteenth Surface Fifteenth Surface k 0.000000E+00 0.000000E+00 0.000000E+00 −8.734524E+00 −9.314254E+00 0.000000E+00 0.000000E+00 A4 −1.570946E−01 1.965673E−01 2.949169E−02 −2.147537E−02 −3.740352E−02 −1.647134E−01 −9.550239E−02 A6 2.392780E−01 −2.700715E−01 8.308701E−02 −1.133301E−03 5.995195E−03 8.920998E−02 3.772603E−02 A8 −3.561126E−01 2.557666E−01 −9.124832E−02 −8.785381E−03 −3.885859E−03 −2.675224E−02 −8.686744E−03 A10 3.309687E−01 −1.852837E−01 4.367386E−02 7.696092E−03 1.404605E−03 4.938097E−03 1.225552E−03 A12 −1.823757E−01 9.581295E−02 −1.197242E−02 −4.107572E−03 −3.104224E−04 −5.781215E−04 −1.114126E−04 A14 6.206510E−02 −3.334549E−02 2.037687E−03 1.292619E−03 4.905823E−05 4.308854E−05 6.541232E−06 A16 −1.298446E−02 7.356270E−03 −2.189236E−04 −2.218048E−04 −5.095907E−06 −1.984418E−06 −2.390863E−07 A18 1.548296E−03 −9.274818E−04 1.397038E−05 1.921759E−05 2.923762E−07 5.156088E−08 4.938606E−09 A20 −8.130000E−05 5.071105E−05 −4.105968E−07 −6.595976E−07 −6.848465E−09 −5.787489E−10 −4.408180E−11

(70) The imaging lens in Example 4 satisfies conditional expressions (1) to (16) as shown in Table 6.

(71) 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

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

(73) TABLE-US-00005 TABLE 5 Example 5 Unit mm f = 4.41 Fno = 1.80 ω(°) = 50.0 ih = 5.20 TTL = 6.77 Surface Data i r d Nd vd (Object) Infinity Infinity  1* −5.1318 0.3612 1.614 25.59 (vd1)  2* −5.8640 0.0150  3* 2.1185 0.4171 1.544 56.44 (vd2)  4* 2.9266 0.2138    5 (Stop) Infinity 0.2956  6* 11.2998 0.7119 1.535 55.69 (vd3)  7* −3.3882 0.8107  8* −1.7411 0.3500 1.671 19.24 (vd4)  9* −4.4001 0.0150  10* −16.0844 0.7839 1.544 56.44 (vd5)  11* −2.6672 0.0378  12* 1.6196 0.5686 1.671 19.24 (vd6)  13* 1.4437 0.5786  14* 33.2409 0.7000 1.535 55.69 (vd7)  15* 4.4690 0.3000 18 Infinity 0.2100 1.517 64.20 19 Infinity 0.4751 Image Infinity Plane Constituent Lens Data Lens Start Surface Focal Length 1 1 −82.380 2 3 11.921 3 6 4.958 4 8 −4.535 5 10 5.754 6 12 66.660 7 14 −9.737 Aspheric Surface Data First Surface Second Surface Third Surface Fourth Surface Sixth Surface Seventh Surface Eighth Surface k 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 2.775143E+00 0.000000E+00 A4 9.142448E−02 8.169247E−02 −8.131085E−02 −1.051246E−01 −1.625675E−02 −2.505735E−02 −1.852683E−01 A6 −6.884655E−02 −1.614422E−02 1.211228E−01 1.570491E−01 −9.782568E−02 −3.479284E−02 4.297653E−01 A8 6.748080E−02 −1.335855E−02 −3.194752E−01 −4.471011E−01 3.237385E−01 4.545957E−02 −6.569296E−01 A10 −4.456018E−02 5.111209E−02 6.223224E−01 9.298553E−01 −7.634999E−01 −3.049134E−02 6.666670E−01 A12 1.703890E−02 −6.255486E−02 −8.027952E−01 −1.262144E+00 1.104730E+00 −2.604688E−02 −4.018237E−01 A14 −2.916918E−03 3.872523E−02 6.470218E−01 1.072306E+00 −1.004307E+00 6.295606E−02 1.415824E−01 A16 −1.662958E−04 −1.211653E−02 −3.141520E−01 −5.455067E−01 5.557794E−01 −4.784134E−02 −2.699725E−02 A18 1.346107E−04 1.484534E−03 8.363369E−02 1.499248E−01 −1.711312E−01 1.688995E−02 2.116780E−03 A20 −1.386192E−05 1.266272E−05 −9.252885E−03 −1.647224E−02 2.253404E−02 −2.359519E−03 1.000000E−05 Ninth Surface Tenth Surface Eleventh Surface Twelfth Surface Thirteenth Surface Fourteenth Surface Fifteenth Surface k 0.000000E+00 0.000000E+00 0.000000E+00 −1.050193E+01 −8.478520E+00 0.000000E+00 0.000000E+00 A4 −1.826499E−01 1.546948E−01 8.937599E−02 1.583719E−02 −4.761329E−02 −1.661793E−01 −8.970432E−02 A6 3.321773E−01 −1.703613E−01 −2.215601E−02 −6.555494E−02 1.663649E−02 8.923855E−02 3.582294E−02 A8 −4.844002E−01 1.072957E−01 4.214381E−03 5.418326E−02 −9.675492E−03 −2.675124E−02 −8.551046E−03 A10 4.315165E−01 −5.026992E−02 −7.917523E−03 −3.131891E−02 3.463087E−03 4.938137E−03 1.271425E−03 A12 −2.290185E−01 1.858137E−02 5.529895E−03 1.123206E−02 −7.530780E−04 −5.781215E−04 −1.231789E−04 A14 7.451088E−02 −5.212136E−03 −1.700216E−03 −2.441990E−03 1.041077E−04 4.308855E−05 7.791369E−06 A16 −1.466772E−02 1.014050E−03 2.703765E−04 3.185596E−04 −8.883984E−06 −1.984404E−06 −3.106068E−07 A18 1.605597E−03 −1.205488E−04 −2.201454E−05 −2.317981E−05 4.217292E−07 5.156225E−08 7.091847E−09 A20 −7.486622E−05 6.510047E−06 7.320648E−07 7.263738E−07 −8.446763E−09 −5.789449E−10 −7.081930E−11

(74) The imaging lens in Example 5 satisfies conditional expressions (1) to (16) as shown in Table 6.

(75) 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.

(76) In table 6, values of conditional expressions (1) to (16) related to the Examples 1 to 5 are shown.

(77) TABLE-US-00006 TABLE 6 Conditional Expressions Example 1 Example 2 Example 3 Example 4 Example 5  (1) (T1/TTL) × 100 0.22 0.22 0.22 0.22 0.22  (2) T2/T4 37.23 36.77 37.25 38.08 33.96  (3) vd6 19.24 19.24 19.24 19.24 19.24  (4) vd6/vd7 0.35 0.35 0.35 0.35 0.35  (5) (D1/|f1|) × 100 5.22 4.26 4.20 4.16 0.44  (6) (T4/TTL) × 100 0.22 0.22 0.22 0.22 0.22  (7) T1/T2 0.03 0.03 0.03 0.03 0.03  (8) f3/f 0.96 0.98 0.96 0.97 1.12  (9) f4/f −0.91 −0.97 −1.01 −1.05 −1.03 (10) f5/f 1.38 1.52 1.57 1.81 1.31 (11) f5/f7 −0.69 −0.77 −0.79 −0.91 −0.59 (12) r1/f −4.16 −2.89 −2.94 −3.50 −1.16 (13) r2/f −0.98 −0.98 −1.00 −1.07 −1.33 (14) r11/f 0.42 0.41 0.37 0.35 0.37 (15) r12/f 0.41 0.41 0.36 0.35 0.33 (16) r13/f 15.28 16.63 13.73 14.20 7.54

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

DESCRIPTION OF REFERENCE NUMERALS

(79) ST: aperture stop L1: first lens L2: second lens L3: third lens L4: fourth lens L5: fifth lens L6: sixth lens L7: seventh lens ih: maximum image height IR: filter IMG: imaging plane