IMAGING LENS AND IMAGING APPARATUS

Abstract

The imaging lens consists of, in order from an object side, a positive first lens L1, a negative second lens L2, a positive third lens L3, and a positive fourth lens L4. Conditional expressions relating to a focal length f of an entire system, a combined focal length f234 of the second lens L2 to the fourth lens L4, an Abbe number d1 of the first lens L1, an Abbe number d2 of the second lens L2, a radius of curvature R1 of a surface of the first lens L1 on the object side, and a radius of curvature R2 of a surface of the first lens L1 on an image side: 0.4<f/f234<2; d1<50; 5<d1d2<26; 5<(R1+R2)/(R1R2)<0.9 are satisfied.

Claims

1. An imaging lens consisting of, in order from an object side: a first lens having positive refractive power; a second lens having negative refractive power; a third lens having positive refractive power; and a fourth lens having positive refractive power, wherein all of the following conditional expressions (1) to (4) are satisfied;
0.4<f/f234<2(1)
d1<50(2)
5<d1d2<26(3)
5<(R1+R2)/(R1R2)<0.9(4) where f: a focal length of an entire system f234: a combined focal length of the second lens, the third lens, and the fourth lens d1: an Abbe number for d-line of the first lens d2: an Abbe number for d-line of the second lens R1: a radius of curvature of a surface of the first lens on the object side R2: a radius of curvature of a surface of the first lens on an image side.

2. The imaging lens according to claim 1, wherein the following conditional expression (1-1) is satisfied;
0.55<f/f234<1.45(1-1)

3. The imaging lens according to claim 1, wherein the following conditional expression (5) is satisfied;
0.2<D1/f(5) where D1: a thickness of the first lens on an optical axis.

4. The imaging lens according to claim 2, wherein the following conditional expression (5) is satisfied;
0.2<D1/f(5) where D1: a thickness of the first lens on an optical axis.

5. The imaging lens according to 1, wherein the following conditional expression (6) is satisfied;
27<(d3+d4)/2d2<34(6) where d3: an Abbe number for d-line of the third lens d4: an Abbe number for d-line of the fourth lens.

6. The imaging lens according to 2, wherein the following conditional expression (6) is satisfied;
27<(d3+d4)/2d2<34(6) where d3: an Abbe number for d-line of the third lens d4: an Abbe number for d-line of the fourth lens.

7. The imaging lens according to 3, wherein the following conditional expression (6) is satisfied;
27<(d3+d4)/2d2<34(6) where d3: an Abbe number for d-line of the third lens d4: an Abbe number for d-line of the fourth lens.

8. The imaging lens according to 4, wherein the following conditional expression (6) is satisfied;
27<(d3+d4)/2d2<34(6) where d3: an Abbe number for d-line of the third lens d4: an Abbe number for d-line of the fourth lens.

9. The imaging lens according to claim 1, wherein the following conditional expression (7) is satisfied;
30<d1(d3+d4)/2<3(7) where d3: an Abbe number for d-line of the third lens d4: an Abbe number for d-line of the fourth lens.

10. The imaging lens according to claim 2, wherein the following conditional expression (7) is satisfied;
30<d1(d3+d4)/2<3(7) where d3: an Abbe number for d-line of the third lens d4: an Abbe number for d-line of the fourth lens.

11. The imaging lens according to claim 3, wherein the following conditional expression (7) is satisfied;
30<d1(d3+d4)/2<3(7) where d3: an Abbe number for d-line of the third lens d4: an Abbe number for d-line of the fourth lens.

11. The imaging lens according to claim 4, wherein the following conditional expression (7) is satisfied;
30<d1(d3+d4)/2<3(7) where d3: an Abbe number for d-line of the third lens d4: an Abbe number for d-line of the fourth lens.

13. The imaging lens according to claim 5, wherein the following conditional expression (7) is satisfied;
30<d1(d3+d4)/2<3(7) where d3: an Abbe number for d-line of the third lens d4: an Abbe number for d-line of the fourth lens.

14. The imaging lens according to claim 6, wherein the following conditional expression (7) is satisfied;
30<d1(d3+d4)/2<3(7) where d3: an Abbe number for d-line of the third lens d4: an Abbe number for d-line of the fourth lens.

15. The imaging lens according to claim 7, wherein the following conditional expression (7) is satisfied;
30<d1(d3+d4)/2<3(7) where d3: an Abbe number for d-line of the third lens d4: an Abbe number for d-line of the fourth lens.

16. The imaging lens according to claim 8, wherein the following conditional expression (7) is satisfied;
30<d1(d3+d4)/2<3(7) where d3: an Abbe number for d-line of the third lens d4: an Abbe number for d-line of the fourth lens.

17. The imaging lens according to claim 1, wherein the following conditional expression (8) is satisfied;
2.5<(R8+R9)/(R8R9)<0.5(8) where R8: a radius of curvature of a surface of the fourth lens on the object side R9: a radius of curvature of a surface of the fourth lens on the image side.

18. The imaging lens according to claim 2, wherein the following conditional expression (8) is satisfied;
2.5<(R8+R9)/(R8R9)<0.5(8) where R8: a radius of curvature of a surface of the fourth lens on the object side R9: a radius of curvature of a surface of the fourth lens on the image side.

19. The imaging lens according to claim 1, wherein the following conditional expression (9) is satisfied;
40<2<60(9) where 2: a maximum full angle of view, the unit of which is degree ().

20. An imaging apparatus comprising: the imaging lens according to claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG. 1 is a sectional view showing the configuration and optical paths of an imaging lens of Example 1 of the invention.

[0033] FIG. 2 is a sectional view showing the configuration and optical paths of an imaging lens of Example 2 of the invention.

[0034] FIG. 3 is a sectional view showing the configuration and optical paths of an imaging lens of Example 3 of the invention.

[0035] FIG. 4 is a sectional view showing the configuration and optical paths of an imaging lens of Example 4 of the invention.

[0036] FIG. 5 is a sectional view showing the configuration and optical paths of an imaging lens of Example 5 of the invention.

[0037] FIG. 6 is a sectional view showing the configuration and optical paths of an imaging lens of Example 6 of the invention.

[0038] FIG. 7 is a sectional view showing the configuration and optical paths of an imaging lens of Example 7 of the invention.

[0039] FIG. 8 is a sectional view showing the configuration and optical paths of an imaging lens of Example 8 of the invention.

[0040] FIG. 9 is a sectional view showing the configuration and optical paths of an imaging lens of Example 9 of the invention.

[0041] FIG. 10 is a sectional view showing the configuration and optical paths of an imaging lens of Example 10 of the invention.

[0042] FIG. 11 is a sectional view showing the configuration and optical paths of an imaging lens of Example 11 of the invention.

[0043] FIG. 12 is a sectional view showing the configuration and optical paths of an imaging lens of Example 12 of the invention.

[0044] FIG. 13 is a sectional view showing the configuration and optical paths of an imaging lens of Example 13 of the invention.

[0045] FIG. 14 is a sectional view showing the configuration and optical paths of an imaging lens of Example 14 of the invention.

[0046] FIG. 15 is a sectional view showing the configuration and optical paths of an imaging lens of Example 15 of the invention.

[0047] FIG. 16 shows a spherical aberration diagram, an astigmatism diagram, a distortion diagram, and a lateral chromatic aberration diagram of the imaging lens of Example 1 of the invention.

[0048] FIG. 17 shows a spherical aberration diagram, an astigmatism diagram, a distortion diagram, and a lateral chromatic aberration diagram of the imaging lens of Example 2 of the invention.

[0049] FIG. 18 shows a spherical aberration diagram, an astigmatism diagram, a distortion diagram, and a lateral chromatic aberration diagram of the imaging lens of Example 3 of the invention.

[0050] FIG. 19 shows a spherical aberration diagram, an astigmatism diagram, a distortion diagram, and a lateral chromatic aberration diagram of the imaging lens of Example 4 of the invention.

[0051] FIG. 20 shows a spherical aberration diagram, an astigmatism diagram, a distortion diagram, and a lateral chromatic aberration diagram of the imaging lens of Example 5 of the invention.

[0052] FIG. 21 shows a spherical aberration diagram, an astigmatism diagram, a distortion diagram, and a lateral chromatic aberration diagram of the imaging lens of Example 6 of the invention.

[0053] FIG. 22 shows a spherical aberration diagram, an astigmatism diagram, a distortion diagram, and a lateral chromatic aberration diagram of the imaging lens of Example 7 of the invention.

[0054] FIG. 23 shows a spherical aberration diagram, an astigmatism diagram, a distortion diagram, and a lateral chromatic aberration diagram of the imaging lens of Example 8 of the invention.

[0055] FIG. 24 shows a spherical aberration diagram, an astigmatism diagram, a distortion diagram, and a lateral chromatic aberration diagram of the imaging lens of Example 9 of the invention.

[0056] FIG. 25 shows a spherical aberration diagram, an astigmatism diagram, a distortion diagram, and a lateral chromatic aberration diagram of the imaging lens of Example 10 of the invention.

[0057] FIG. 26 shows a spherical aberration diagram, an astigmatism diagram, a distortion diagram, and a lateral chromatic aberration diagram of the imaging lens of Example 11 of the invention.

[0058] FIG. 27 shows a spherical aberration diagram, an astigmatism diagram, a distortion diagram, and a lateral chromatic aberration diagram of the imaging lens of Example 12 of the invention.

[0059] FIG. 28 shows a spherical aberration diagram, an astigmatism diagram, a distortion diagram, and a lateral chromatic aberration diagram of the imaging lens of Example 13 of the invention.

[0060] FIG. 29 shows a spherical aberration diagram, an astigmatism diagram, a distortion diagram, and a lateral chromatic aberration diagram of the imaging lens of Example 14 of the invention.

[0061] FIG. 30 shows a spherical aberration diagram, an astigmatism diagram, a distortion diagram, and a lateral chromatic aberration diagram of the imaging lens of Example 15 of the invention.

[0062] FIG. 31 is a diagram illustrating an application example of an imaging apparatus according to an embodiment of the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0063] Hereinafter, an embodiment of the invention will be described in detail referring to the drawings. FIG. 1 is a sectional view showing the configuration and optical paths of an imaging lens according to an embodiment of the invention. A configuration example shown in FIG. 1 corresponds to an imaging lens according to Example 1 of the invention described below. In FIG. 1, the left side is an object side, and the right side is an image side. The optical paths are for an axial light beam 2 and an off-axial light beam 3 at a maximum angle of view. A half value (maximum half angle of view) of the maximum full angle of view is also shown.

[0064] The imaging lens includes, in order from the object side toward the image side along an optical axis Z, a first lens L1 having positive refractive power, a second lens L2 having negative refractive power, a third lens L3 having positive refractive power, and a fourth lens L4 having positive refractive power.

[0065] In the example of FIG. 1, a parallel flat plate-shaped optical member PP is disposed between the lens system and an image plane Sim. The optical member PP assumes various filters and/or a cover glass. In the invention, the optical member PP may be disposed at a position different from that in the example of FIG. 1, or a configuration in which the optical member PP is omitted may be made.

[0066] In the example of FIG. 1, an aperture stop St is disposed between the second lens L2 and the third lens L3. The aperture stop St shown in FIG. 1 does not necessarily represent the size or shape thereof, and indicates a position on the optical axis Z. The aperture stop St may be disposed at a position different from that in the example of FIG. 1.

[0067] The imaging lens is configured such that all of the following conditional expressions (1) to (4) are satisfied.

0.4<f/f234<2(1)

d1<50(2)

5<d1d2<26(3)

5<(R1+R2)/(R1R2)<0.9(4)

[0068] where

[0069] f: a focal length of an entire system

[0070] f234: a combined focal length of the second lens, the third lens, and the fourth lens

[0071] d1: an Abbe number for d-line of the first lens

[0072] d2: an Abbe number for d-line of the second lens

[0073] R1: a radius of curvature of a surface of the first lens on the object side

[0074] R2: a radius of curvature of a surface of the first lens on the image side.

[0075] The imaging lens is configured such that the value off/f234 is not equal to or less than a lower limit defined in the conditional expression (1), whereby it becomes easy to reduce an angle of principal rays at a peripheral angle of view incident on the image plane Sim. The imaging lens is configured such that the value of f/f234 is not equal to or greater than an upper limit defined in the conditional expression (1), whereby it becomes advantageous for reduction in the total length of the lens system.

[0076] In order to increase the effect relating to the conditional expression (1), it is preferable that the following conditional expression (1-1) is satisfied.

0.55<f/f234<1.45(1-1)

[0077] The imaging lens is configured such that the value of d1 is not equal to or greater than an upper limit defined in the conditional expression (2), whereby it becomes easy to take the balance of lateral chromatic aberration and axial chromatic aberration, and it becomes advantageous to realize satisfactory performance in a region of visible light to near infrared light. When adjusting the angle of the principal rays at the peripheral angle of view incident on the image plane Sim, it becomes easy to correct lateral chromatic aberration relating to blue light being likely to be corrected insufficiently. In addition, it is preferable that the following conditional expression (2-1) is satisfied. The conditional expression (2-1) is satisfied, whereby it becomes easy to correct lateral chromatic aberration and axial chromatic aberration with satisfactory balance.

25<d1<50(2-1)

[0078] The imaging lens is configured such that the value of d1d2 is not equal to or less than a lower limit defined in the conditional expression (3), whereby it becomes easy to satisfactorily correct axial chromatic aberration. The imaging lens is configured such that the value of d1d2 is not equal to or greater than an upper limit defined in the conditional expression (3), whereby it becomes easy to satisfactorily correct lateral chromatic aberration. The conditional expression (3) is satisfied, whereby it becomes advantageous to realize satisfactory performance in the region of visible light to near infrared light.

[0079] The imaging lens is configured such that the value of (R1+R2)/(R1R2) is not equal to or less than a lower limit defined in the conditional expression (4), whereby it becomes easy to suppress the occurrence of spherical aberration. The imaging lens is configured such that the value of (R1+R2)/(R1R2) is not equal to or greater than an upper limit defined in the conditional expression (4), whereby it becomes advantageous for reduction in the total length of the lens system.

[0080] In the imaging lens, it is preferable that at least one or an arbitrary combination of the following conditional expressions (5) to (9) is satisfied;

0.2<D1/f(5)

27<(d3+d4)/2d2<34(6)

30<d1(d3+d4)/2<3(7)

2.5<(R8+R9)/(R8R9)<0.5(8)

40<2<60(9)

[0081] where

[0082] D1: a thickness of the first lens on an optical axis

[0083] f: the focal length of the entire system

[0084] d3: an Abbe number for d-line of the third lens

[0085] d4: an Abbe number for d-line of the fourth lens

[0086] d2: the Abbe number for d-line of the second lens

[0087] d1: the Abbe number for d-line of the first lens

[0088] R8: a radius of curvature of a surface of the fourth lens on the object side

[0089] R9: a radius of curvature of a surface of the fourth lens on the image side

[0090] 2: a maximum full angle of view, the unit of which is degree ().

[0091] The imaging lens is configured such that the value of D1/f is not equal to or less than a lower limit defined in the conditional expression (5), whereby it is possible to increase the strength of the first lens L1, and damage or the like due to in-vehicle vibration hardly occurs. It is preferable that the following conditional expression (5-1) is satisfied. The imaging lens is configured such that the value of D1/f is not equal to or greater than an upper limit defined in the conditional expression (5-1), whereby it is possible to suppress an excessive increase in thickness of the first lens L1, and to achieve reduction in the total length of the lens system.

0.2<D1/f<0.6(5-1)

[0092] The imaging lens is configured such that the value of (d3+d4)/2d2 is not equal to or less than a lower limit defined in the conditional expression (6), whereby it becomes easy to satisfactorily correct axial chromatic aberration. The imaging lens is configured such that the value of (d3+d4)/2d2 is not equal to or greater than an upper limit defined in the conditional expression (6), whereby it becomes easy to satisfactorily correct lateral chromatic aberration.

[0093] The imaging lens is configured such that the value of d1(d3+d4)/2 is not equal to or less than a lower limit defined in the conditional expression (7), whereby it becomes easy to satisfactorily correct axial chromatic aberration. The imaging lens is configured such that the value of d1(d3+d4)/2 is not equal to or greater than an upper limit defined in the conditional expression (7), whereby it becomes easy to satisfactorily correct lateral chromatic aberration.

[0094] The imaging lens is configured such that the value of (R8+R9)/(R8R9) is not equal to or less than a lower limit defined in the conditional expression (8), whereby it becomes easy to reduce the angle of the principal rays at the peripheral angle of view incident on the image plane Sim. The imaging lens is configured such that the value of (R8+R9)/(R8R9) is not equal to or greater than an upper limit defined in the conditional expression (8), whereby it becomes easy to suppress the occurrence of astigmatism.

[0095] The imaging lens is configured such that the value of 2 is not equal to or less than a lower limit defined in the conditional expression (9), whereby, for use in driver monitoring, even if the sitting position of the driver is deviated, a possibility that the eyelids and eyeballs of the driver are out of an imaging visual field is lowered. The imaging lens is configured such that the value of 2 is not equal to or greater than an upper limit defined in the conditional expression (9), whereby, for use in driver monitoring, it is possible to allocate an appropriate number of pixels to a region of an imaging element corresponding to the eyelids and the eyeballs, and to perform analysis of a captured image by software with high accuracy.

[0096] Each lens can take, for example, the following configuration. The first lens L1 can be a plano-convex lens having a convex surface toward the object side or a biconvex lens. The second lens L2 can be a biconcave lens. The third lens L3 can be a positive meniscus lens having a convex surface toward the image side or a biconvex lens. The fourth lens L4 can be a positive lens having a convex surface toward the object side. However, the first lens L1 to the fourth lens L4 may have shapes different from the above-described shapes.

[0097] Arbitrary combinations of the preferred configuration and possible configurations described above are possible, and it is preferable that these combinations are appropriately selectively employed according to required specifications. According to this embodiment, it is possible to realize an imaging lens having an angle of view suitable for use in driver monitoring and having satisfactory performance in the region of visible light to near infrared light. The angle of view suitable for use in driver monitoring used herein is an angle of view in a range of 40<2<60 when the maximum full angle of view is 2. Visible light used herein assumes light having a wavelength of 400 to 700 nm, and near infrared light assumes light having a wavelength of 700 nm to 1100 nm where nm represents nanometer.

[0098] Next, examples of numerical values of the imaging lens of the invention will be described.

Example 1

[0099] The lens configuration and optical paths of an imaging lens of Example 1 are as shown in FIG. 1, and since the manner in which the drawings are illustrated and the configuration are as described as the example shown in FIG. 1, overlapping description will be omitted.

[0100] Basic lens data of the imaging lens of Example 1 is shown in Table 1, and aspheric coefficients are shown in Table 2. In Table 1, the column Si shows an i-th (where i=1, 2, 3, . . . ) surface number in a case where a surface number is given to each surface of each component in a sequentially increasing manner toward the image side with the surface on the object side of the component on the most object side designated as first, the column Ri shows the radius of curvature of the i-th surface, and the column Di shows the surface distance between the i-th surface and an (i+1)th surface on the optical axis Z. In Table 1, the column Ndj shows a refractive index with respect to d-line (wavelength of 587.56 nm) of a j-th (where j=1, 2, 3, . . . ) component in a sequentially increasing manner toward the image side with the component on the most object side designated as first, and the column dj shows an Abbe number for d-line of the j-th component.

[0101] The sign of the radius of curvature is positive in a case where the surface shape is a convex shape toward the object side, and is negative in a case where the surface shape is a convex surface toward the image side. Table 1 also shows the aperture stop St and the optical member PP. In Table 1, the surface number and text reading (St) are described in the column of the surface number of corresponding to the aperture stop St. The value in the lowermost column of Di is the distance between the surface on the most image side in the table and the image plane Sim. Above the frame of Table 1, the focal length f of the entire system, an F-Number FNo., and the maximum full angle of view 2 for d-line are shown.

[0102] In Table 1, an asterisk mark * is attached to the surface number of each aspheric surface, and a numerical value of a paraxial radius of curvature is described in the column of the radius of curvature of the aspheric surface. Table 2 shows the aspheric coefficients of the respective aspheric surfaces of Example 1. En (where n: integer) in the numerical values of the aspheric coefficients of Table 2 means 10.sup.N. The aspheric coefficients are the values of respective coefficients KA and Am (where m is an integer equal to or greater than three and is different for each surface) in an expression of aspheric surface represented by the following expression.

[00001]$\mathrm{Zd}=\frac{C{h}^2}{1+\sqrt{1-\mathrm{KA}{C}^2{h}^2}}+\underset{m}{.Math.}.Math..Math.\mathrm{Am}{h}^m$

[0103] where

[0104] Zd: a depth of the aspheric surface (a length of a vertical line from a point on the aspheric surface at a height h to a plane perpendicular to the optical axis in contact with the apex of the aspheric surface)

[0105] h: a height (a distance from the optical axis to the lens surface)

[0106] C: a paraxial curvature

[0107] KA, Am: aspheric coefficients

[0108] In data of the respective tables, degree () is used as the unit of angle and millimeter (mm) is used as the unit of length, but other appropriate units may also be used since optical systems are usable even if the optical systems are proportionally enlarged or proportionally reduced. In the respective tables described below, numerical values rounded at predetermined digits are described.

TABLE-US-00001 TABLE 1 EXAMPLE 1 f = 6.84, FNo. = 1.80, 2 = 50.4 Si Ri Di Ndj dj 1 6.3169 3.0000 1.90366 31.31 2 0.4000 *3 6.3866 0.8000 1.63360 23.61 *4 5.4929 0.3000 5 (St) 0.9065 *6 5.5017 2.9199 1.53114 55.44 *7 4.2649 0.2000 *8 3.6523 2.2142 1.53114 55.44 *9 90.2352 0.2000 10 1.0000 1.51680 64.20 11 3.2948

TABLE-US-00002 TABLE 2 EXAMPLE 1 SURFACE NUMBER 3 4 6 7 KA 0.0000000E+00 0.0000000E00 0.0000000E+00 0.0000000E+00 A3 2.2741981E03 6.5757158E05 2.1122153E02 9.2976520E02 A4 1.3529127E03 8.0371806E03 6.5023701E03 1.4530721E02 A5 1.8968717E03 1.9659554E02 4.0916350E02 1.6416865E02 A6 2.9727994E04 3.2036128E02 2.1028588E02 2.7592658E02 A7 8.6087094E05 2.1412623E02 1.0341542E02 1.3965157E02 A8 1.1924552E05 5.4945243E03 1.8427885E03 2.2653385E03 SURFACE NUMBER 8 9 KA 1.1600226E+00 2.4489299E+05 A3 5.2560244E02 3.3690209E02 A4 7.9463858E02 5.5379346E02 A5 7.9171266E02 2.1919553E02 A6 2.4814021E02 3.5587120E03 A7 1.4021307E03 1.9800747E04 A8 5.2335985E04 5.3999273E06 A9 2.2900843E05 8.1435493E06 A10 2.2441923E05 1.9377142E06 A11 1.7983924E07 1.0583760E06

[0109] FIG. 16 shows respective aberration diagrams in a state where the imaging lens of Example 1 is focused on an object at infinity. FIG. 16 shows spherical aberration, astigmatism, distortion, and lateral chromatic aberration (chromatic aberration of magnification) in order from the left side. In the spherical aberration diagram, aberrations relating to d-line (wavelength of 587.56 nm), C-line (wavelength of 656.27 nm), F-line (wavelength of 486.13 nm), and s-line (wavelength of 852.11 nm) are respectively indicated by a solid line, a long broken line, a short broken line, and a one-dot-chain line. In the astigmatism diagram, aberrations relating to d-line in a sagittal direction (d-line (S)) and a tangential direction (d-line (T)) are respectively indicated by a black solid line and a short broken line, and aberrations relating to s-line in the sagittal direction (s-line (S)) and the tangential direction (s-line (T)) are respectively indicated by a one-dot-chain line and a gray solid line. In the distortion diagram, aberrations relating to d-line and s-line are respectively indicated by a solid line and a one-dot-chain line. In the lateral chromatic aberration diagram, aberrations relating to d-line and s-line are respectively by a solid line and a one-dot-chain line. In the spherical aberration diagram, FNo. means the F-Number, and in other aberration diagrams, means a half angle of view.

[0110] The symbols, the meanings, and the description methods used in the description of Example 1 described above will apply to the following examples unless otherwise specifically described, and thus, overlapping description will be omitted in the following description.

Example 2

[0111] FIG. 2 is a sectional view showing the lens configuration and optical paths of an imaging lens of Example 2. Table 3 shows basic lens data of the imaging lens of Example 2, Table 4 shows aspheric coefficients, and FIG. 17 shows respective aberration diagrams in a state of being focused on an object at infinity.

TABLE-US-00003 TABLE 3 EXAMPLE 2 f = 6.89, FNo. = 1.80, 2 = 50.0 Si Ri Di Ndj dj 1 6.2189 3.0000 1.90366 31.31 2 0.4000 *3 6.8992 0.8000 1.63360 23.61 *4 5.1154 0.3000 5 (St) 0.6784 *6 4.9519 2.8119 1.53114 55.44 *7 4.2607 0.2000 *8 3.6119 1.6000 1.53114 55.44 *9 0.2000 10 1.0000 1.51680 64.20 11 3.6947

TABLE-US-00004 TABLE 4 EXAMPLE 2 SURFACE NUMBER 3 4 6 7 KA 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A3 2.2741981E03 2.3012820E02 1.0129330E02 1.1950963E01 A4 1.3529127E03 5.3495660E02 3.8950730E03 3.3578462E02 A5 1.8968717E03 6.2747126E02 6.0750918E02 1.1159663E02 A6 2.9727994E04 4.6701208E02 5.2383744E02 2.0327067E02 A7 8.6087094E05 1.9487573E02 2.7623960E02 1.2577927E02 A8 1.1924552E05 3.9298114E03 5.9093593E03 2.4106217E03 SURFACE NUMBER 8 9 KA 1.1600226E+00 3.7014196E+05 A3 8.3331235E02 2.2410789E02 A4 5.2844603E02 5.9370939E02 A5 6.8327295E02 2.7320217E02 A6 2.3511660E02 5.8523204E03 A7 1.4193003E03 3.9001183E04 A8 5.2639704E04 4.4304750E05 A9 2.3953478E05 6.6061917E06 A10 2.2805260E05 4.0295622E07 A11 4.8311884E07 5.1459151E07

Example 3

[0112] FIG. 3 is a sectional view showing the lens configuration and optical paths of an imaging lens of Example 3. Table 5 shows basic lens data of the imaging lens of Example 3, Table 6 shows aspheric coefficients, and FIG. 18 shows respective aberration diagrams in a state of being focused on an object at infinity.

TABLE-US-00005 TABLE 5 EXAMPLE 3 f = 7.94, FNo. = 1.80, 2 = 42.0 Si Ri Di Ndj dj 1 6.2875 3.3000 1.90366 31.31 2 0.4600 *3 3.9756 0.8000 1.63360 23.61 *4 3.3376 0.4000 5 (St) 0.1500 *6 5.2917 2.8000 1.53114 55.44 *7 7.5240 0.2000 *8 4.2916 2.3000 1.53114 55.44 9 0.0500 10 1.0000 1.51680 64.20 11 3.7346

TABLE-US-00006 TABLE 6 EXAMPLE 3 SURFACE NUMBER 3 4 KA 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 A4 9.6062352E03 2.0353103E03 A5 0.0000000E+00 0.0000000E+00 A6 2.0501260E04 1.4977116E03 SURFACE NUMBER 6 7 8 KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 2.6173672E03 1.1121173E03 3.2497701E03 A5 0.0000000E+00 0.0000000E+00 A6 2.1443417E04 6.6522439E04 A7 0.0000000E+00 0.0000000E+00 A8 1.3274890E04 8.0252536E05

Example 4

[0113] FIG. 4 is a sectional view showing the lens configuration and optical paths of an imaging lens of Example 4. Table 7 shows basic lens data of the imaging lens of Example 4, Table 8 shows aspheric coefficients, and FIG. 19 shows respective aberration diagrams in a state of being focused on an object at infinity.

TABLE-US-00007 TABLE 7 EXAMPLE 4 f = 6.78, FNo. = 1.80, 2 = 50.4 Si Ri Di Ndj dj 1 6.2880 2.6000 1.90366 31.31 2 0.4500 *3 4.8799 0.8300 1.63360 23.61 *4 4.2783 0.3000 5 (St) 0.7000 *6 8.5000 1.8127 1.53114 55.44 *7 6.2631 0.1000 *8 2.9096 1.2114 1.53114 55.44 *9 32.6120 2.4000 10 1.0000 1.51680 64.20 11 2.3369

TABLE-US-00008 TABLE 8 EXAMPLE 4 SURFACE NUMBER 3 4 KA 0.0000000E+00 0.0000000E+00 A3 2.2741981E03 2.6606304E02 A4 1.3529127E03 7.2569772E02 A5 1.8968717E03 1.1887319E01 A6 2.9727994E04 1.1252237E01 A7 8.6087094E05 5.7943644E02 A8 1.924552E05 1.2590385E02 SURFACE NUMBER 6 7 8 9 KA 0.0000000E+00 0.0000000E+00 1.1600226E+00 1.0000000E+00 A3 3.0179864E03 1.0135140E01 8.9551280E02 0.0000000E+00 A4 3.3417701E02 3.4954952E02 4.4378129E04 3.7473811E03 A5 1.2701962E01 2.1418564E02 2.9572726E02 1.6376081E03 A6 1.3576726E01 2.2701900E02 1.7757830E02 8.4881609E05 A7 6.6294702E02 1.4245146E02 2.3549737E03 A8 8.1689470E03 3.1177004E03 2.9073776E04 A9 4.4178354E04 1.8329509E05 5.2295361E05 A10 5.9139990E04 9.2408016E06 1.6597990E06 A11 2.6230240E04 9.5310594E06 1.8148950E05 A12 3.1570659E06 1.0313521E05 A13 3.7577069E05 1.4400728E06 A14 1.1006883E05 1.2707981E06 A15 3.1368581E05 1.2661399E07 A16 1.6472401E05 1.1979228E08 A17 1.9494613E05 2.9959221E07 A18 3.3024902E06 2.0489221E08 A19 3.8789834E06 1.6193511E08 A20 1.6481849E06 6.3189583E09

Example 5

[0114] FIG. 5 is a sectional view showing the lens configuration and optical paths of an imaging lens of Example 5. Table 9 shows basic lens data of the imaging lens of Example 5, Table 10 shows aspheric coefficients, and FIG. 20 shows respective aberration diagrams in a state of being focused on an object at infinity.

TABLE-US-00009 TABLE 9 EXAMPLE 5 f = 6.70, FNo. = 1.80, 2 = 49.8 Si Ri Di Ndj dj 1 5.7178 2.6000 1.90366 31.31 2 0.4000 *3 4.5497 0.6000 1.63360 23.61 *4 4.2626 0.4000 5 (St) 0.5500 *6 5.1323 0.9845 1.53114 55.44 *7 3.9711 0.1000 *8 2.6952 0.9845 1.53114 55.44 *9 0.2000 10 1.0000 1.51680 64.20 11 4.0228

TABLE-US-00010 TABLE 10 EXAMPLE 5 SURFACE NUMBER 3 4 KA 0.0000000E+00 0.0000000E+00 A3 2.2741981E03 2.0317518E02 A4 1.3529127E03 5.6176171E02 A5 1.8968717E03 1.0368302E01 A6 2.9727994E04 1.0766475E01 A7 8.6087094E05 5.8215157E02 A8 1.1924552E05 1.2952933E02 SURFACE NUMBER 6 7 8 9 KA 0.0000000E+00 0.0000000E+00 1.1600226E+00 4.5739402E+06 A3 2.8059435E02 9.6227148E02 9.1611838E02 2.1713754E02 A4 7.6316425E02 4.3106121E04 9.0585039E03 2.9394150E02 A5 1.6668178E01 9.4335772E03 3.3663072E02 3.1919195E02 A6 1.3927356E01 9.1044415E03 1.7744225E02 5.3639453E03 A7 6.6113234E02 1.4764977E02 2.1039139E03 3.2377555E03 A8 8.2047902E03 3.2725210E03 3.3215051E04 4.0406654E05 A9 3.3686394E04 5.3705053E05 6.4162667E05 3.7748124E04 A10 4.4418626E04 1.4807411E05 4.7716297E06 2.7536148E04 A11 2.0987693E04 9.7801377E06 1.7862674E05 1.3033542E04 A12 1.2399261E05 1.1255292E05 A13 4.2417492E05 7.0888662E06 A14 3.5757876E05 2.8267316E06 A15 4.3789714E05 5.9104061E07 A16 2.7674809E05 4.7439131E07 A17 3.2084820E06 3.1717749E08 A18 4.6634626E06 7.3304478E08 A19 2.1672013E06 9.6322681E09 A20 1.4125527E06 1.2252155E08

Example 6

[0115] FIG. 6 is a sectional view showing the lens configuration and optical paths of an imaging lens of Example 6. Table 11 shows basic lens data of the imaging lens of Example 6, Table 12 shows aspheric coefficients, and FIG. 21 shows respective aberration diagrams in a state of being focused on an object at infinity.

TABLE-US-00011 TABLE 11 EXAMPLE 6 f = 6.65, FNo = 1.80, 2 = 49.8 Si Ri Di Ndj dj 1 5.8883 2.5000 1.90366 31.31 2 0.4000 *3 4.7934 0.6000 1.63360 23.61 *4 4.8842 0.3000 5 (St) 0.7000 *6 4.0654 1.0847 1.53114 55.44 *7 3.5571 0.1000 *8 2.8428 1.5000 1.53114 55.44 *9 1.0000 10 1.0000 1.51680 64.20 11 3.0169

TABLE-US-00012 TABLE 12 EXAMPLE 6 SURFACE NUMBER 3 4 KA 0.0000000E+00 0.0000000E+00 A3 2.2741981E03 1.0363246E02 A4 1.3529127E03 4.2958679E02 A5 1.8968717E03 8.9917684E02 A6 2.9727994E04 1.0186628E01 A7 8.6087094E05 5.8271027E02 A8 1.1924552E05 1.3650699E02 SURFACE NUMBER 6 7 8 9 KA 0.0000000E+00 0.0000000E+00 1.1600226E+00 4.5739402E+06 A3 2.0290643E02 6.4090940E02 5.5944520E02 5.0522736E03 A4 5.6383804E02 1.5552672E02 3.3923999E02 6.1529074E03 A5 1.5294028E01 1.5408080E02 5.6101438E02 8.5663621E03 A6 1.3989793E01 1.0484717E02 2.2907571E02 8.0641406E04 A7 6.5784090E02 1.4232545E02 1.4616388E03 3.3777702E03 A8 8.6822728E03 3.3420979E03 4.5518817E04 1.1118670E04 A9 6.7583597E04 6.3105614E05 1.1665155E04 3.5923340E04 A10 5.9140756E04 1.7407024E05 1.4234879E05 2.7573286E04 A11 2.3209329E04 8.6609095E06 1.8514272E05 1.2983771E04 A12 4.2331630E05 1.0407157E05 A13 7.9657584E05 5.6933173E06 A14 6.5361567E05 2.3887663E06 A15 4.6182607E05 3.1981948E08 A16 6.5316655E06 2.7322915E07 A17 2.3046565E06 4.2510094E07 A18 7.6475159E06 1.8188022E07 A19 4.4187022E06 7.1692034E08 A20 1.6771773E06 5.2825637E08

Example 7

[0116] FIG. 7 is a sectional view showing the lens configuration and optical paths of an imaging lens of Example 7. Table 13 shows basic lens data of the imaging lens of Example 7, Table 14 shows aspheric coefficients, and FIG. 22 shows respective aberration diagrams in a state of being focused on an object at infinity.

TABLE-US-00013 TABLE 13 EXAMPLE 7 f = 6.55, FNo. = 1.80, 2 = 49.8 Si Ri Di Ndj dj 1 6.8992 2.6000 1.90366 31.31 2 0.4500 *3 4.0950 0.6000 1.63360 23.61 *4 12.6022 0.3000 5 (St) 0.7000 *6 4.0654 1.0847 1.53114 55.44 *7 3.6105 0.1000 *8 2.5064 2.0000 1.53114 55.44 9 10.0000 1.2000 10 1.0000 1.51680 64.20 11 2.2668

TABLE-US-00014 TABLE 14 EXAMPLE 7 SURFACE NUMBER 3 4 KA 0.0000000E+00 0.0000000E+00 A3 2.2741981E03 1.1788823E02 A4 1.3529127E03 4.3013209E02 A5 1.8968717E03 9.1138958E02 A6 2.9727994E04 1.0435321E01 A7 8.6087094E05 9.9133300E02 A8 1.1924552E05 1.3213872E02 SURFACE NUMBER 6 7 8 KA 0.0000000E+00 0.0000000E+00 1.1600226E+00 A3 1.9555749E02 4.8500141E02 3.8402530E02 A4 8.5701163E02 3.1291385E02 4.8136728E03 A5 1.6185417E01 3.3960321E02 1.2238879E02 A6 1.4003940E01 2.4673729E02 1.0143816E02 A7 6.4358583E02 1.3886753E02 2.1233630E03 A8 8.8570780E03 3.1640840E03 9.3678972E05 A9 6.1318090E04 5.3545108E05 2.9948226E05 A10 5.6603717E04 2.3893015E05 1.2710845E05 A11 2.4612732E04 7.7769833E06 3.4424107E05 A12 1.9931076E05 1.2284089E05 A13 6.2606369E05 7.7843494E06 A14 5.7572222E05 3.9625480E06 A15 4.6077595E05 9.3187754E07 A16 4.3078517E06 6.7597248E07 A17 2.1750066E07 2.1120618E07 A18 7.8330037E06 7.1466462E08 A19 3.9079925E06 1.7977195E07 A20 2.2831005E06 4.0953556E08

Example 8

[0117] FIG. 8 is a sectional view showing the lens configuration and optical paths of an imaging lens of Example 8. Table 15 shows basic lens data of the imaging lens of Example 8, Table 16 shows aspheric coefficients, and FIG. 23 shows respective aberration diagrams in a state of being focused on an object at infinity.

TABLE-US-00015 TABLE 15 EXAMPLE 8 f = 6.62, FNo. = 2.20, 2 = 51.4 Si Ri Di Ndj dj 1 4.0654 2.6000 1.90366 31.31 2 6.2582 0.4000 *3 12.2276 0.6000 1.63360 23.61 *4 9.1950 0.3000 5 (St) 0.3501 *6 4.0654 0.9845 1.53114 55.44 *7 3.5571 0.1000 *8 2.7802 0.9845 1.53114 55.44 *9 11.1674 0.1000 10 1.0000 1.51680 64.20 11 2.4693

TABLE-US-00016 TABLE 16 EXAMPLE 8 SURFACE NUMBER 3 4 6 7 KA 1.8695070E+01 1.2309709E+01 0.0000000E+00 0.0000000E+00 A3 2.2741981E03 6.0739510E03 2.7944412E04 9.3820316E02 A4 1.3529127E03 2.8882853E02 2.6649555E02 2.2743719E03 A5 1.8968717E03 1.2903369E02 1.1730467E01 2.3640115E02 A6 2.9727994E04 1.0837399E01 1.2670214E01 1.6481327E02 A7 8.6087094E05 1.1880894E01 8.0899654E02 1.5502266E02 A8 1.1924552E05 4.1956537E02 6.9096025E03 1.2035957E03 A9 2.4545183E04 3.4619014E04 1.1858470E02 1.0314368E03 A10 1.2475186E04 2.3879855E04 1.1111771E02 1.0504400E04 A11 5.8858964E05 2.0440682E04 9.1430215E03 1.3028418E04 A12 2.0926703E05 2.2490158E03 3.4822305E03 2.1193123E04 A13 3.5933835E06 8.4962480E04 2.8821784E02 2.4545238E04 A14 5.0988972E05 2.7804347E03 2.1090802E02 1.8375402E04 A15 1.4833389E04 2.8516694E04 7.8381542E03 1.9195203E04 A16 5.7885137E05 1.7883701E03 2.2478976E03 1.5472907E04 A17 9.5788164E05 1.7968101E04 4.4269909E04 8.2418037E05 A18 3.3245981E05 3.5277748E05 9.6828077E04 1.3299131E05 A19 1.7146320E05 4.7909828E05 4.4083575E04 4.5850260E06 A20 4.5538580E06 3.2995507E05 4.1828232E04 8.3941673E06 SURFACE NUMBER 8 9 KA 2.0614417E01 5.7644549E+03 A3 1.1513875E01 7.1483837E02 A4 8.5393628E03 1.0210789E01 A5 3.8506540E02 3.5879472E02 A6 1.9012334E02 3.1610068E03 A7 1.7151986E03 9.6044759E04 A8 1.9548192E04 7.9025460E05 A9 4.3998188E05 2.3176640E05 A10 2.5406699E05 1.6839075E05 A11 1.0324973E05 8.0574360E06 A12 4.5544663E07 7.0133348E07 A13 2.1869788E07 1.0654495E07 A14 5.9124367E08 2.3286726E07 A15 2.2318569E08 1.7763933E07 A16 2.5422997E06 1.9584231E06 A17 4.1053268E07 7.8007801E09 A18 3.0189538E07 5.4483969E07 A19 8.1565031E07 4.0231023E07 A20 1.5374776E07 1.7281335E07

Example 9

[0118] FIG. 9 is a sectional view showing the lens configuration and optical paths of an imaging lens of Example 9. Table 17 shows basic lens data of the imaging lens of Example 9, Table 18 shows aspheric coefficients, and FIG. 24 shows respective aberration diagrams in a state of being focused on an object at infinity.

TABLE-US-00017 TABLE 17 EXAMPLE 9 f = 6.53, FNo. = 1.80, 2 = 50.2 Si Ri Di Ndj dj 1 6.9457 2.6000 1.90366 31.31 2 0.4500 *3 4.9267 0.8000 1.63360 23.61 *4 9.5363 0.3000 5 (St) 0.7000 *6 4.0654 1.2667 1.53114 55.44 *7 3.6033 0.1000 *8 2.6831 3.0000 1.53114 55.44 9 10.0000 1.2000 10 1.0000 1.51680 64.20 11 1.4702

TABLE-US-00018 TABLE 18 EXAMPLE 9 SURFACE NUMBER 3 4 KA 0.0000000E+00 0.0000000E+00 A3 2.2741981E03 2.0452221E02 A4 1.3529127E03 5.7388605E02 A5 1.8968717E03 1.0663396E01 A6 2.9727994E04 1.0750430E01 A7 8.6087094E05 5.8822930E02 A8 1.1924552E05 1.2859451E02 SURFACE NUMBER 6 7 8 KA 0.0000000E+00 0.0000000E+00 1.1600226E+00 A3 1.0901124E02 7.6815244E02 6.4725637E02 A4 6.9415689E02 7.2239633E02 3.5467204E02 A5 1.4828762E01 5.0261871E02 3.6237705E03 A6 1.4113558E01 2.5996570E02 9.4296304E03 A7 6.4229675E02 1.3259914E02 2.6495263E03 A8 8.8255463E03 3.2454690E03 1.9101706E04 A9 5.7107579E04 7.5417663E05 4.3314449E05 A10 5.5243900E04 3.9928360E05 9.6951340E06 A11 2.5426469E04 1.0810583E06 3.0659033E05 A12 2.8465455E06 9.0473242E06 A13 4.5501371E05 7.0787836E06 A14 4.2558509E05 4.0568879E06 A15 4.0366128E05 1.2023945E06 A16 1.9250941E07 5.9597771E07 A17 3.1548545E06 2.8799753E07 A18 8.3160674E06 1.5798352E09 A19 4.1153418E06 1.1330945E07 A20 3.0135856E06 2.6400901E08

Example 10

[0119] FIG. 10 is a sectional view showing the lens configuration and optical paths of an imaging lens of Example 10. Table 19 shows basic lens data of the imaging lens of Example 10, Table 20 shows aspheric coefficients, and FIG. 25 shows respective aberration diagrams in a state of being focused on an object at infinity.

TABLE-US-00019 TABLE 19 EXAMPLE 10 f = 6.82, FNo. = 1.80, 2 = 50.6 Si Ri Di Ndj dj 1 6.5642 3.0000 1.90366 31.31 2 0.4500 *3 4.7919 0.8000 1.63360 23.61 *4 4.0654 0.3000 5 (St) 0.7000 *6 19.4015 2.0000 1.53114 55.44 *7 8.1278 0.1000 *8 2.7865 2.0000 1.53114 55.44 9 45.6663 1.2000 10 1.0000 1.51680 64.20 11 2.9413

TABLE-US-00020 TABLE 20 EXAMPLE 10 SURFACE NUMBER 3 4 KA 0.0000000E+00 0.0000000E+00 A3 2.2741981E03 2.6350969E02 A4 1.3529127E03 7.3511189E02 A5 1.8968717E03 1.2205444E01 A6 2.9727994E04 1.1383144E01 A7 8.6087094E05 5.7552233E02 A8 1.1924552E05 1.2213049E02 SURFACE NUMBER 6 7 8 KA 0.0000000E+00 0.0000000E+00 1.1600226E+00 A3 7.8227922E03 9.6310903E02 8.3598400E02 A4 4.4374492E02 3.8811439E02 7.4248377E03 A5 1.2755063E01 1.9245687E02 2.6084207E02 A6 1.3562182E01 2.0570617E02 1.6676168E02 A7 6.6336357E02 1.4116293E02 2.2020280E03 A8 8.3035755E03 3.1864261E03 2.6915348E04 A9 6.6410533E04 4.1789440E05 5.7634076E05 A10 7.1255516E04 1.9122695E05 9.7119742E07 A11 3.3571090E04 6.4046648E06 2.0438890E05 A12 7.0920147E06 6.7087024E06 A13 6.4617860E05 3.3798146E06 A14 6.7679486E05 2.4801159E06 A15 3.0328317E05 3.7190907E07 A16 1.6042375E05 2.7198465E07 A17 1.1139270E05 4.5766857E07 A18 4.1188865E06 7.8968951E08 A19 4.7292792E06 4.1901801E08 A20 2.0784203E06 3.7384941E08

Example 11

[0120] FIG. 11 is a sectional view showing the lens configuration and optical paths of an imaging lens of Example 11. Table 21 shows basic lens data of the imaging lens of Example 11, Table 22 shows aspheric coefficients, and FIG. 26 shows respective aberration diagrams in a state of being focused on an object at infinity.

TABLE-US-00021 TABLE 21 EXAMPLE 11 f = 6.69, FNo. = 1.80, 2 = 50.0 Si Ri Di Ndj dj 1 6.4468 2.6000 1.90366 31.31 2 0.4500 *3 5.1516 0.8000 1.63360 23.61 *4 4.5142 0.3000 5 (St) 0.7000 *6 4.1892 1.5209 1.53114 55.44 *7 3.9776 0.1000 *8 2.8318 3.0000 1.53114 55.44 *9 109.2822 1.2000 10 1.0000 1.51680 64.20 11 2.4257

TABLE-US-00022 TABLE 22 EXAMPLE 11 SURFACE NUMBER 3 4 KA 0.0000000E+00 0.0000000E+00 A3 2.2741981E03 2.1253833E02 A4 1.3529127E03 6.9377651E02 A5 1.8968717E03 1.1754122E01 A6 2.9727994E04 1.1295246E01 A7 8.6087094E05 5.7845558E02 A8 1.1924552E05 1.2531969E02 SURFACE NUMBER 6 7 8 9 KA 0.0000000E+00 0.0000000E+00 1.1600226E+00 1.0000000E+00 A3 2.0035781E03 9.2969481E02 8.7771835E02 2.1924890E03 A4 1.8355296E02 4.0710493E02 2.0074535E02 3.2887883E03 A5 1.2555852E01 2.4521762E02 2.2984189E02 6.8661731E04 A6 1.3604802E01 2.2087781E02 1.7270576E02 1.2219516E03 A7 6.6633174E02 1.4280318E02 2.5165439E03 1.2147368E04 A8 7.9496932E03 3.1527749E03 3.4951598E04 2.5247503E05 A9 4.0732216E04 5.4616528E05 7.2759816E05 1.0060383E05 A10 6.7002056E04 2.5177110E05 1.9873366E06 3.5199431E06 A11 3.5740774E04 6.8785363E06 2.4952922E05 2.5158087E07 A12 4.5984776E05 1.1788663E05 1.4966181E06 A13 4.8086223E05 2.9265695E06 1.0935638E06 A14 4.2917095E05 1.9875389E06 4.8170655E07 A15 4.9114816E05 3.3425092E08 1.6301883E08 A16 1.0845443E05 9.7531463E08 1.4923426E07 A17 2.5002837E06 3.4127173E07 A18 4.5661386E06 5.9301006E08 A19 4.0263803E06 4.9378497E09 A20 8.4370400E07 1.5236796E08

Example 12

[0121] FIG. 12 is a sectional view showing the lens configuration and optical paths of an imaging lens of Example 12. Table 23 shows basic lens data of the imaging lens of Example 12, Table 24 shows aspheric coefficients, and FIG. 27 shows respective aberration diagrams in a state of being focused on an object at infinity.

TABLE-US-00023 TABLE 23 EXAMPLE 12 f = 6.68, FNo. = 2.60, 2 = 57.8 Si Ri Di Ndj dj 1 6.6913 2.6000 1.90366 31.31 2 0.4500 *3 5.5642 0.8300 1.63360 23.61 *4 4.0654 0.5000 5 (St) 0.5000 *6 13.0359 2.2167 1.53114 55.44 *7 6.7842 0.1000 *8 2.8680 3.0000 1.53114 55.44 9 1.2000 10 1.0000 1.51680 64.20 11 2.4398

TABLE-US-00024 TABLE 24 EXAMPLE 12 SURFACE NUMBER 3 4 KA 0.0000000E+00 0.0000000E+00 A3 2.2741981E03 1.7217507E02 A4 1.3529127E03 5.8682325E02 A5 1.8968717E03 1.1373986E01 A6 2.9727994E04 1.1320657E01 A7 8.6087094E05 5.7544946E02 A8 1.1924552E05 1.1839906E02 SURFACE NUMBER 6 7 8 KA 0.0000000E+00 0.0000000E+00 1.1600226E+00 A3 1.6043525E02 1.0640996E01 9.3194640E02 A4 5.0504212E02 3.9070752E02 6.7001106E03 A5 1.3232249E01 1.8395045E02 3.2184216E02 A6 1.3400484E01 2.1155696E02 1.9215208E02 A7 6.6601322E02 1.4474219E02 2.3829390E03 A8 8.2667145E03 3.0742957E03 3.2757586E04 A9 6.7153208E04 2.4774994E05 6.1895039E05 A10 7.7424426E04 2.4631900E05 8.5637772E07 A11 3.7833671E04 1.1431849E06 1.9073726E05 A12 1.4561425E06 7.8943347E06 A13 5.6211589E05 1.3698634E06 A14 5.4419047E05 1.6397874E06 A15 1.9668222E04 1.2692899E07 A16 9.6127817E05 2.2975220E07 A17 1.8305285E05 2.6834493E07 A18 2.0204082E05 9.5957292E09 A19 1.5979814E05 9.6671586E09 A20 1.7745003E06 6.1944420E09

Example 13

[0122] FIG. 13 is a sectional view showing the lens configuration and optical paths of an imaging lens of Example 13. Table 25 shows basic lens data of the imaging lens of Example 13, Table 26 shows aspheric coefficients, and FIG. 28 shows respective aberration diagrams in a state of being focused on an object at infinity.

TABLE-US-00025 TABLE 25 EXAMPLE 13 f = 6.43, FNo. = 2.60, 2 = 56.4 Si Ri Di Ndj dj 1 9.3187 3.0000 2.00100 29.13 2 0.4000 *3 4.8536 0.8000 1.63360 23.61 *4 4.1006 0.3815 5 (St) 0.4500 *6 16.2547 2.8000 1.53114 55.44 *7 3.5571 0.2000 8 9.2079 2.0000 1.77250 49.60 9 0.2000 10 1.0000 1.51680 64.20 11 4.7255

TABLE-US-00026 TABLE 26 EXAMPLE 13 SURFACE NUMBER 3 4 6 7 KA 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A3 2.2741981E03 1.9896045E02 2.4111549E02 1.0681893E02 A4 1.3529127E03 6.6606611E02 8.7255257E02 1.8488144E02 A5 1.8968717E03 1.2421884E01 1.7725113E01 2.3338267E02 A6 2.9727994E04 1.1541948E01 1.7200482E01 1.1533534E02 A7 8.6087094E05 5.6800325E02 8.2735017E02 2.6925309E03 A8 1.1924552E05 1.1180052E02 1.5572438E02 1.5499083E04

Example 14

[0123] FIG. 14 is a sectional view showing the lens configuration and optical paths of an imaging lens of Example 14. Table 27 shows basic lens data of the imaging lens of Example 14, Table 28 shows aspheric coefficients, and FIG. 29 shows respective aberration diagrams in a state of being focused on an object at infinity.

TABLE-US-00027 TABLE 27 EXAMPLE 14 f = 6.42, FNo. = 2.60, 2 = 59.4 Si Ri Di Ndj dj 1 10.5000 2.6000 1.80400 46.58 2 0.4000 *3 4.0654 0.8000 1.63360 23.61 *4 5.8796 0.5531 5 (St) 0.4500 *6 140.1037 2.3366 1.53114 55.44 *7 3.5571 0.2000 8 8.4389 1.8000 1.77250 49.60 9 0.1846 10 1.0000 1.51680 64.20 11 6.2334

TABLE-US-00028 TABLE 28 EXAMPLE 14 SURFACE NUMBER 3 4 6 7 KA 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A3 2.2741981E03 3.7312088E02 1.1951082E02 6.6417989E03 A4 1.3529127E03 1.4068658E01 4.0934234E02 4.8931499E03 A5 1.8968717E03 2.7884770E01 8.3459534E02 5.6035212E03 A6 2.9727994E04 2.7744454E01 7.7858836E02 7.9882907E04 A7 8.6087094E05 1.4038229E01 3.6132608E02 3.4577107E04 A8 1.1924552E05 2.8019434E02 6.7218281E03 1.5064765E04

Example 15

[0124] FIG. 15 is a sectional view showing the lens configuration and optical paths of an imaging lens of Example 15. Table 29 shows basic lens data of the imaging lens of Example 15, Table 30 shows aspheric coefficients, and FIG. 30 shows respective aberration diagrams in a state of being focused on an object at infinity.

TABLE-US-00029 TABLE 29 EXAMPLE 15 f = 6.37, FNo. = 2.60, 2 = 59.0 Si Ri Di Ndj dj 1 10.5000 2.6000 1.80400 46.58 2 0.4000 *3 4.0654 0.8000 1.63360 23.61 *4 6.1107 0.5363 5 (St) 0.4500 *6 35.9379 2.1066 1.53114 55.44 *7 3.5571 0.2000 8 8.9245 1.8000 1.80400 46.58 9 0.1846 10 1.0000 1.51680 64.20 11 5.8646

TABLE-US-00030 TABLE 30 EXAMPLE 15 SURFACE NUMBER 3 4 6 7 KA 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A3 2.2741981E03 2.3867273E02 9.3656196E03 5.4272634E04 A4 1.3529127E03 1.0770269E01 4.6123315E02 4.5619504E03 A5 1.8968717E03 2.5357410E01 9.8889895E02 1.4836479E03 A6 2.9727994E04 2.8950542E01 9.2352661E02 1.4363318E03 A7 8.6087094E05 1.6643583E01 4.1509573E02 2.8801713E04 A8 1.1924552E05 3.7435977E02 7.4171151E03 1.7782189E05

[0125] Table 31 shows corresponding values of the conditional expressions (1) to (9) of the imaging lenses of Examples 1 to 15. The values shown in Table 31 are for d-line.

TABLE-US-00031 TABLE 31 EXPRESSION EXAM- EXAM- EXAM- EXAM- EXAM- EXAM- EXAM- EXAM- NUMBER PLE 1 PLE 2 PLE 3 PLE 4 PLE 5 PLE 6 PLE 7 PLE 8 (1) f/f234 1.23 1.16 0.79 0.95 0.70 0.74 0.72 0.74 (2) d1 31.31 31.31 31.31 31.31 31.31 31.31 31.31 31.31 (3) d1 d2 7.7 7.7 7.7 7.7 7.7 7.7 7.7 7.7 (4) (R1 + R2)/(R1 R2) 1 1 1 1 1 1 1 4.708 (5) D1/f 0.44 0.44 0.42 0.38 0.39 0.38 0.40 0.39 (6) (d3 + d4)/2 d2 31.83 31.83 31.83 31.83 31.83 31.83 31.83 31.83 (7) d1 (d3 + d4)/2 24.13 24.13 24.13 24.13 24.13 24.13 24.13 24.13 (8) (R8 + R9)/(R8 R9) 1.08 1.00 1.00 0.84 1.00 1.00 1.67 1.66 (9) 2 50.4 50.0 42.0 50.4 49.8 49.8 49.8 51.4 EXPRESSION EXAM- EXAM- EXAM- EXAM- EXAM- EXAM- EXAM- NUMBER PLE 9 PLE 10 PLE 11 PLE 12 PLE 13 PLE 14 PLE 15 (1) f/f234 0.74 1.02 0.93 1.00 1.03 1.00 0.99 (2) d1 31.31 31.31 31.31 31.31 29.13 46.58 46.58 (3) d1 d2 7.7 7.7 7.7 7.7 5.52 22.97 22.97 (4) (R1 + R2)/(R1 R2) 1 1 1 1 1 1 1 (5) D1/f 0.40 0.44 0.39 0.39 0.47 0.40 0.41 (6) (d3 + d4)/2 d2 31.83 31.83 31.83 31.83 28.91 28.91 27.4 (7) d1 (d3 + d4)/2 24.13 24.13 24.13 24.13 23.39 5.94 4.43 (8) (R8 + R9)/(R8 R9) 1.73 0.88 0.95 1.00 1.00 1.00 1.00 (9) 2 50.2 50.6 50.0 57.8 56.4 59.4 59.0

[0126] As can be understood from data described above, all of the imaging lenses of Examples 1 to 15 have a small number of lenses, that is, the four lenses and are compact, and are high-performance imaging lenses which have the maximum full angle of view within a range of 40 to 60 and in which respective aberrations are satisfactorily corrected in a region of visible light to near infrared light.

[0127] Next, an imaging apparatus according to an embodiment of the invention will be described. An example of a camera which is mounted in a driver monitoring system as an embodiment of an imaging apparatus of the invention will be described. FIG. 31 shows a manner in which the camera is mounted in a vehicle.

[0128] In FIG. 31, a driver monitoring system 10 which is provided inside a vehicle 100 includes a camera 11 and a control unit 12. The camera 11 includes the imaging lens according to the embodiment of the invention, and an imaging element which converts an optical image formed by the imaging lens to an electrical signal. The camera 11 acquires a face image of a driver 13 by regularly capturing an image including the face of the driver 13 using visible light and near infrared light. The control unit 12 analyzes the face image by software, determines the state of the driver 13, and when dozing and/or looking-aside is detected, outputs a warning.

[0129] Although the invention has been described in connection with the embodiment and the examples, the invention is not limited to the foregoing embodiment and examples, and various modifications may be made. For example, the values of the radius of curvature, the surface distance, the refractive index, the Abbe number, and the aspheric coefficient of each lens are not limited to the values shown in the respective examples of numerical values, and may take other values.

[0130] The imaging apparatus of the invention is not limited to that having the above-described configuration. The driver monitoring system described in the foregoing embodiment is not limited to a vehicle, and can be applied to an arbitrary mobile object which is driven by the driver. The imaging apparatus of the invention is not limited to a camera which is provided in a mobile object, and can be applied to, for example, a camera for a portable terminal, a surveillance camera, a digital camera, or the like.

EXPLANATION OF REFERENCES

[0131] 2: axial light beam [0132] 3: off-axial light beam [0133] 10: driver monitoring system [0134] 11: camera [0135] 12: control unit [0136] 13: driver [0137] 100: vehicle [0138] L1: first lens [0139] L2: second lens [0140] L3: third lens [0141] L4: fourth lens [0142] PP: optical member [0143] Sim: image plane [0144] St: aperture stop [0145] Z: optical axis [0146] : half value of maximum full angle of view