Wide-angle lens

Abstract

A wide-angle lens in which various aberrations of the wide-angle lens are easily and appropriately corrected while achieving the overall downsizing of the wide-angle lens. The wide-angle lens of the present invention includes a first lens, a second lens, a third lens, a fourth lens, an aperture, a fifth lens, a sixth lens, a seventh lens, and an imaging device, which are arranged in this order from the object side, the first lens being a negative lens with a convex spherical surface toward the object side and a concave surface toward the image side, the second lens being a negative lens with a concave surface toward the image side, and when a composite focal length of the first lens and the second lens is f12 and a maximum image height is HOI, the following relationship is satisfied: -1.000 < f12 / HOI < -0.400.

Description

TECHNICAL FIELD

[0001] The present application relates to a wide-angle lens. BACKGROUND

[0002] As a wide-angle lens for a vehicle-mounted camera, there has been a wide-angle lens including, in order from an object side, a first lens, a second lens, a third lens, a fourth lens, an aperture, a fifth lens, a sixth lens, a seventh lens, and an imaging element (see, for example, Patent Literature 1).

[0003] Patent Literature 1: Japanese Patent Application Publication No. 2018-60153

[0004] In practice, the overall size of a space for mounting the above-described wide-angle lens on a vehicle is sometimes limited, and thus it is desirable to achieve a reduction in the size of the entire wide-angle lens while easily and appropriately correcting various aberrations of the wide-angle lens. SUMMARY

[0005] The present application has been achieved in view of the above-described problems, and aims to provide a wide-angle lens that achieves a reduction in the size of the entire wide-angle lens while easily and appropriately correcting various aberrations of the wide-angle lens.

[0006] To achieve the above-described object, the present application provides a wide-angle lens including, in order from an object side, a first lens, a second lens, a third lens, a fourth lens, an aperture, a fifth lens, a sixth lens, a seventh lens, and an imaging element, the first lens being a negative lens with a convex spherical surface toward the object side and a concave surface toward an image side, the second lens being a negative lens with a concave surface toward the image side, and when a composite focal point distance of the first lens and the second lens is set as f12 and a maximum image height is set as HOI, the following relationship is satisfied: -1.000 < f12 / HOI < -0.400.

[0007] According to the wide-angle lens of the present application, the relationship f12 / HOI > -1.000 is satisfied, and thus it is possible to reduce the lens diameter and the object-image distance, thereby achieving a reduction in the size of the entire wide-angle lens. On the other hand, the relationship f12 / HOI < -0.400 is satisfied, and thus it is possible to avoid excessive negative power, thereby easily and appropriately correcting field curvature, lateral chromatic aberration, and coma, and thus achieving excellent optical performance.

[0008] Further, in the wide-angle lens of the present application, it is preferable that the following relationship be satisfied: -0.700 < f12 / HOI < -0.500.

[0009] According to the wide-angle lens of the present application, the relation f12 / HOI > -0.700 is satisfied, and thus the object-image distance can be further reduced, and the entire wide-angle lens can be miniaturized. On the other hand, the relation f12 / HOI < -0.500 is satisfied, and thus the negative power can be further weakened, and the field curvature, the chromatic aberration of magnification, and the coma can be more easily corrected, and thus excellent optical characteristics can be achieved.

[0010] Further, in the wide-angle lens of the present application, it is preferable that the following relation is satisfied when the effective radius of the object side lens surface of the first lens is set as sdll: 2.000 < sdll / HOI < 4.000.

[0011] According to the wide-angle lens of the present application, the relation sdll / HOI > 2.000 is satisfied, and thus the position of the light beam passing on the optical axis and the position of the light beam passing outside the optical axis can be separated, and the field curvature can be corrected. On the other hand, the relation sdll / HOI < 4.000 is satisfied, and thus the diameter of the first lens can be suppressed, and the wide-angle lens can be more easily miniaturized.

[0012] Further, in the wide-angle lens of the present application, it is preferable that the following relation is satisfied: 2.500 < sdll / HOI < 3.500.

[0013] According to the wide-angle lens of the present application, the relation sdll / HOI > 2.500 is satisfied, and thus the position of the light beam passing on the optical axis and the position of the light beam passing outside the optical axis can be further separated, and the field curvature can be more favorably corrected. On the other hand, the relation sdll / HOI < 3.500 is satisfied, and thus the diameter of the first lens can be further suppressed, and the wide-angle lens can be more easily miniaturized.

[0014] Further, in the wide-angle lens of the present application, it is preferable that the following relation is satisfied when the object-image distance of the wide-angle lens is set as d: 5.000 < d / HOI < 8.000.

[0015] According to the wide-angle lens of the present application, the relation d / HOI > 5.000 is satisfied, and thus various aberrations can be favorably corrected. On the other hand, the relation d / HOI < 8.000 is satisfied, and thus the lens diameter and the object-image distance can be reduced, and the entire wide-angle lens can be miniaturized.

[0016] Further, in the wide-angle lens of the present application, it is preferable that the following relation is satisfied: 6.000 < d / HOI < 7.000.

[0017] The wide-angle lens according to the present application satisfies the relation d / HOI > 6.000, and thus various aberrations can be corrected more favorably. On the other hand, the wide-angle lens according to the present application satisfies the relation d / HOI < 7.000, and thus the lens diameter and the object-image distance can be further reduced, thereby achieving the overall miniaturization of the wide-angle lens.

[0018] In the wide-angle lens according to the present application, it is preferable that the sixth lens and the seventh lens constitute a cemented lens, the third lens be a positive lens with a convex surface facing the image side, the fourth lens be a positive lens with a convex surface facing the image side, the fifth lens be a positive lens with a convex surface facing the object side and a convex surface facing the image side, the sixth lens be a negative lens with a concave surface facing the image side, the seventh lens be a positive lens with a convex surface facing the object side and a convex surface facing the image side, the composite focal length distance of the first lens, the second lens, the third lens, and the fourth lens be f1234, and the composite focal length distance of the fifth lens, the sixth lens, and the seventh lens be f567, and the following relation be satisfied: 0.800 < f1234 / f567 < 8.000.

[0019] The wide-angle lens according to the present application satisfies the relation f1234 / f567 > 0.800, and thus the focal power of the front lens group constituted by the first lens, the second lens, the third lens, and the fourth lens can be prevented from being too strong, thereby easily making appropriate corrections of various aberrations and easily obtaining excellent optical characteristics. On the other hand, the wide-angle lens according to the present application satisfies the relation f1234 / f567 < 8.000, and thus the focal power of the front lens group constituted by the first lens, the second lens, the third lens, and the fourth lens can be prevented from being too weak, thereby reducing the diameters of the respective lenses of the front lens group and easily achieving the overall miniaturization of the lens system.

[0020] In the wide-angle lens according to the present application, it is preferable that the sixth lens and the seventh lens constitute a cemented lens, the third lens be a positive lens with a convex surface facing the image side, the fourth lens be a positive lens with a convex surface facing the image side, the fifth lens be a positive lens with a convex surface facing the object side and a convex surface facing the image side, the sixth lens be a negative lens with a concave surface facing the image side, the seventh lens be a positive lens with a convex surface facing the object side and a convex surface facing the image side, the composite focal length distance of the fifth lens, the sixth lens, and the seventh lens be f567, and the focal length distance of the entire wide-angle lens be f, and the following relation be satisfied: 2.800 < f567 / f < 3.850.

[0021] In the wide-angle lens according to the present application, the relation f567 / f > 2.800 is satisfied, and thus, it is possible to avoid over-strength of the power of the rear lens group composed of the fifth lens, the sixth lens and the seventh lens, and thereby, it is easy to appropriately correct various aberrations, particularly, chromatic aberration, and thus, it is easy to obtain excellent optical characteristics; on the other hand, the relation f567 / f < 3.850 is satisfied, and thus, it is possible to reduce the diameters of the respective lenses and the object-image distance, and thereby, it is possible to more realize the miniaturization of the entire wide-angle lens.

[0022] Further, in the wide-angle lens according to the present application, when the focal distance of the entire wide-angle lens is set as f and the half field angle of the wide-angle lens is set as θ, the following relation is satisfied: fθ < HOI < 2f tan(θ / 2).

[0023] In the wide-angle lens according to the present application, the relation fθ < HOI < 2f tan(θ / 2) is satisfied, and thus, it is possible to easily realize a photographing lens which can project an image of a peripheral portion to a larger extent, and it is possible to suppress the distortion aberration of the peripheral portion.

[0024] Further, in the wide-angle lens according to the present application, when the object-image distance of the wide-angle lens is set as d and the focal distance of the entire wide-angle lens is set as f, the following relation is satisfied: 11.000 < d / f < 15.000.

[0025] In the wide-angle lens according to the present application, the relation d / f > 11.000 is satisfied, and thus, it is easy to appropriately correct various aberrations, and thereby, it is easy to obtain excellent optical characteristics; on the other hand, the relation d / f < 15.000 is satisfied, and thus, it is possible to suppress the lens system from becoming too large while avoiding the length of the entire lens system from becoming too long.

[0026] Further, in the wide-angle lens according to the present application, the first lens and the fifth lens are preferably glass lenses, and the second lens, the third lens, the fourth lens, the sixth lens and the seventh lens are preferably plastic lenses.

[0027] (EFFECT OF THE INVENTION)

[0028] In the wide-angle lens according to the present application, when the combined focal distance of the first lens and the second lens is set as f12 and the maximum image height is set as HOI, the relation f12 / HOI > -1.000 is satisfied, and thus, it is possible to reduce the lens diameter and the object-image distance, and thereby, it is possible to realize the miniaturization of the entire wide-angle lens; on the other hand, the relation f12 / HOI < -0.400 is satisfied, and thus, it is possible to avoid over-strength of the negative power, and thereby, it is easy to appropriately correct the field curvature, the lateral chromatic aberration and the coma, and thereby, it is possible to realize excellent optical characteristics. BRIEF DESCRIPTION OF DRAWINGS

[0029] FIG. 1 is a diagram showing the field curvature and distortion of the wide-angle lens of Embodiment 1 of the present application.

[0030] FIG. 2A is a diagram showing the field curvature and distortion of the wide-angle lens of Embodiment 1 of the present application.

[0031] FIG. 2B is a diagram showing the field curvature and distortion of the wide-angle lens of Embodiment 1 of the present application.

[0032] FIG. 3A is a diagram showing the lateral chromatic aberration (transverse chromatic aberration) of the wide-angle lens of Embodiment 1 of the present application.

[0033] FIG. 3B is a diagram showing the spherical aberration (longitudinal chromatic aberration) of the wide-angle lens of Embodiment 1 of the present application.

[0034] FIG. 4A to FIG. 4L is a diagram showing the lateral chromatic aberration (transverse chromatic aberration) of the wide-angle lens of Embodiment 1 of the present application.

[0035] FIG. 5 is a diagram showing the field curvature and distortion of the wide-angle lens of Embodiment 2 of the present application.

[0036] FIG. 6A is a diagram showing the field curvature and distortion of the wide-angle lens of Embodiment 2 of the present application.

[0037] FIG. 6B is a diagram showing the field curvature and distortion of the wide-angle lens of Embodiment 2 of the present application.

[0038] FIG. 7A is a diagram showing the lateral chromatic aberration (transverse chromatic aberration) of the wide-angle lens of Embodiment 2 of the present application.

[0039] FIG. 7B is a diagram showing the spherical aberration (longitudinal chromatic aberration) of the wide-angle lens of Embodiment 2 of the present application.

[0040] FIG. 8A to FIG. 8L is a diagram showing the lateral chromatic aberration (transverse chromatic aberration) of the wide-angle lens of Embodiment 2 of the present application.

[0041] FIG. 9 is a diagram showing the field curvature and distortion of the wide-angle lens of Embodiment 3 of the present application.

[0042] FIG. 10A is a diagram showing the field curvature and distortion of the wide-angle lens of Embodiment 3 of the present application.

[0043] FIG. 10B is a diagram showing the field curvature and distortion of the wide-angle lens of Embodiment 3 of the present application.

[0044] FIG. 11A is a graph showing the sagittal chromatic aberration (lateral chromatic aberration) of the wide-angle lens of Embodiment 3 of the present application.

[0045] FIG. 11B is a graph showing the spherical aberration (longitudinal chromatic aberration) of the wide-angle lens of Embodiment 3 of the present application.

[0046] FIG. 12A to FIG. 12L is a graph showing the lateral chromatic aberration of the wide-angle lens of Embodiment 3 of the present application.

[0047] FIG. 13 is a graph showing the wide-angle lens of Embodiment 4 of the present application.

[0048] FIG. 14A is a graph showing the field curvature and distortion of the wide-angle lens of Embodiment 4 of the present application.

[0049] FIG. 14B is a graph showing the field curvature and distortion of the wide-angle lens of Embodiment 4 of the present application.

[0050] FIG. 15A is a graph showing the sagittal chromatic aberration (lateral chromatic aberration) of the wide-angle lens of Embodiment 4 of the present application.

[0051] FIG. 15B is a graph showing the spherical aberration (longitudinal chromatic aberration) of the wide-angle lens of Embodiment 4 of the present application.

[0052] FIG. 16A to FIG. 16L is a graph showing the lateral chromatic aberration of the wide-angle lens of Embodiment 4 of the present application.

[0053] FIG. 17 is a graph showing the wide-angle lens of Embodiment 5 of the present application.

[0054] FIG. 18A is a graph showing the field curvature and distortion of the wide-angle lens of Embodiment 5 of the present application.

[0055] FIG. 18B is a graph showing the field curvature and distortion of the wide-angle lens of Embodiment 5 of the present application.

[0056] FIG. 19A is a graph showing the sagittal chromatic aberration (lateral chromatic aberration) of the wide-angle lens of Embodiment 5 of the present application.

[0057] FIG. 19B is a graph showing the spherical aberration (longitudinal chromatic aberration) of the wide-angle lens of Embodiment 5 of the present application.

[0058] FIG. 20A to FIG. 20L is a graph showing the lateral chromatic aberration of the wide-angle lens of Embodiment 5 of the present application.

[0059] FIG. 21 FIG. 6 is a diagram showing the field curvature and distortion of the wide-angle lens according to Embodiment 6 of the present application.

[0060] FIG. 22A FIG. 7 is a diagram showing the field curvature and distortion of the wide-angle lens according to Embodiment 6 of the present application.

[0061] FIG. 22B FIG. 8 is a diagram showing the field curvature and distortion of the wide-angle lens according to Embodiment 6 of the present application.

[0062] FIG. 23A FIG. 9 is a diagram showing the lateral chromatic aberration (transverse chromatic aberration) of the wide-angle lens according to Embodiment 6 of the present application.

[0063] FIG. 23B FIG. 10 is a diagram showing the spherical aberration (longitudinal chromatic aberration) of the wide-angle lens according to Embodiment 6 of the present application.

[0064] FIG. 24A to FIG. 24L FIG. 11 is a diagram showing the lateral chromatic aberration of the wide-angle lens according to Embodiment 6 of the present application.

[0065] FIG. 25 FIG. 16 is a diagram showing the field curvature and distortion of the wide-angle lens according to Embodiment 7 of the present application.

[0066] FIG. 26A FIG. 17 is a diagram showing the field curvature and distortion of the wide-angle lens according to Embodiment 7 of the present application.

[0067] FIG. 26B FIG. 18 is a diagram showing the field curvature and distortion of the wide-angle lens according to Embodiment 7 of the present application.

[0068] FIG. 27A FIG. 19 is a diagram showing the lateral chromatic aberration (transverse chromatic aberration) of the wide-angle lens according to Embodiment 7 of the present application.

[0069] FIG. 27B FIG. 20 is a diagram showing the spherical aberration (longitudinal chromatic aberration) of the wide-angle lens according to Embodiment 7 of the present application.

[0070] FIG. 28A to FIG. 28L FIG. 21 is a diagram showing the lateral chromatic aberration of the wide-angle lens according to Embodiment 7 of the present application.

[0071] FIG. 29 FIG. 26 is a diagram showing the field curvature and distortion of the wide-angle lens according to Embodiment 8 of the present application.

[0072] FIG. 30A FIG. 27 is a diagram showing the field curvature and distortion of the wide-angle lens according to Embodiment 8 of the present application.

[0073] FIG. 30B FIG. 28 is a diagram showing the field curvature and distortion of the wide-angle lens according to Embodiment 8 of the present application.

[0074] FIG. 31A FIG. 8 is a graph showing the lateral chromatic aberration (transverse chromatic aberration) of the wide-angle lens according to Embodiment 8 of the present application.

[0075] FIG. 31B FIG. 9 is a graph showing the longitudinal chromatic aberration (longitudinal chromatic aberration) of the wide-angle lens according to Embodiment 8 of the present application.

[0076] FIG. 32A to FIG. 32L FIG. 10 is a graph showing the lateral chromatic aberration (transverse chromatic aberration) of the wide-angle lens according to Embodiment 9 of the present application.

[0077] FIG. 33 FIG. 11 is a graph showing the longitudinal chromatic aberration (longitudinal chromatic aberration) of the wide-angle lens according to Embodiment 9 of the present application.

[0078] FIG. 34A FIG. 12 is a graph showing the field curvature and distortion of the wide-angle lens according to Embodiment 9 of the present application.

[0079] FIG. 34B FIG. 13 is a graph showing the field curvature and distortion of the wide-angle lens according to Embodiment 9 of the present application.

[0080] FIG. 35A FIG. 14 is a graph showing the lateral chromatic aberration (transverse chromatic aberration) of the wide-angle lens according to Embodiment 9 of the present application.

[0081] FIG. 35B FIG. 15 is a graph showing the longitudinal chromatic aberration (longitudinal chromatic aberration) of the wide-angle lens according to Embodiment 9 of the present application.

[0082] FIG. 36A to FIG. 36L FIG. 16 is a graph showing the lateral chromatic aberration (transverse chromatic aberration) of the wide-angle lens according to Embodiment 9 of the present application.

[0083] (Symbol Explanation)

[0084] 1000 Wide-angle lens

[0085] 110 First lens

[0086] 120 Second lens

[0087] 130 Third lens

[0088] 140 Fourth lens

[0089] 150 Fifth lens

[0090] 160 Sixth lens

[0091] 170 Seventh lens

[0092] 180 Aperture

[0093] 190 Shutter

[0094] 200 Filter

[0095] 300 image pickup element DETAILED DESCRIPTION

[0096] Hereinafter, each embodiment of the wide-angle lens of the present application will be described with reference to the drawings. Also, in the following description, in the direction of extension of the optical axis L, the object side is denoted as LI and the image side is denoted as L2.

[0097] (Embodiment 1)

[0098] FIG. 1 is a diagram showing the wide-angle lens of Embodiment 1 of the present application, FIG. 2A is a diagram showing the field curvature and distortion of the wide-angle lens of Embodiment 1 of the present application, FIG. 2B is a diagram showing the field curvature and distortion of the wide-angle lens of Embodiment 1 of the present application, FIG. 3A is a diagram showing the transverse chromatic aberration (lateral chromatic aberration) of the wide-angle lens of Embodiment 1 of the present application, FIG. 3B is a diagram showing the spherical aberration (longitudinal chromatic aberration) of the wide-angle lens of Embodiment 1 of the present application, FIG. 4A to FIG. 4L is a diagram showing the lateral chromatic aberration of the wide-angle lens of Embodiment 1 of the present application. Here, in FIG. 2A , FIG. 2B , FIG. 3A , FIG. 3B , FIG. 4A to FIG. 4L , the relevant curve of red light R (wavelength: 656 nm) is denoted by R, the relevant curve of green light G (wavelength: 588 nm) is denoted by G, the relevant curve of blue light B (wavelength: 486 nm) is denoted by B, T indicates the meridional plane, S indicates the sagittal plane, and in FIG. 4A to FIG. 4L , the maximum scale of the longitudinal axis is ±50.000 μm.

[0099] As shown in FIG. 1 , the wide-angle lens 1000 includes, in order from the object side (LI side), a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, an aperture 180, a fifth lens 150, a sixth lens 160, and a seventh lens 170, wherein the sixth lens 160 and the seventh lens 170 are bonded together by an adhesive to constitute a bonded lens.

[0100] Here, the first lens 110 is a lens (simply referred to as a negative lens) having a negative refractive power, in which a convex surface (first surface 1) faces the object side LI and a concave surface (second surface 2) faces the image side L2. In the present embodiment, the first lens 110 is a glass lens in which the first surface 1 and the second surface 2 are spherical.

[0101] The second lens 120 is a lens having a negative refractive power, with a convex surface (third surface 3) facing the object side LI and a concave surface (fourth surface 4) facing the image side L2. In the present embodiment, the second lens 120 is a plastic lens with the third surface 3 and the fourth surface 4 being aspherical surfaces.

[0102] The third lens 130 is a lens having a positive refractive power (referred to as a positive lens), with a concave surface (fifth surface 5) facing the object side LI and a convex surface (sixth surface 6) facing the image side L2. In the present embodiment, the third lens 130 is a plastic lens with the fifth surface 5 and the sixth surface 6 being aspherical surfaces.

[0103] The fourth lens 140 is a lens having a positive refractive power, with a concave surface (seventh surface 7) facing the object side LI and a convex surface (eighth surface 8) facing the image side L2. In the present embodiment, the fourth lens 140 is a plastic lens with the seventh surface 7 and the eighth surface 8 being aspherical surfaces.

[0104] The fifth lens 150 is a lens having a positive refractive power, with a convex surface (tenth surface 10) facing the object side LI and a convex surface (eleventh surface 11) facing the image side L2. In the present embodiment, the fifth lens 150 is composed of a glass lens.

[0105] The sixth lens 160 is a lens having a negative refractive power, with a concave surface (twelfth surface 12) facing the object side LI and a concave surface (thirteenth surface 13) facing the image side L2, and constitutes a cemented lens with the seventh lens 170. In the present embodiment, the sixth lens 160 is a plastic lens with the twelfth surface 12 and the thirteenth surface 13 being aspherical surfaces.

[0106] The seventh lens 170 is a lens having a positive refractive power, with a convex surface (thirteenth surface 13) facing the object side LI and a convex surface (fourteenth surface 14) facing the image side L2. In the present embodiment, the seventh lens 170 is a plastic lens with the thirteenth surface 13 and the fourteenth surface 14 being aspherical surfaces.

[0107] Further, in the present embodiment, as shown in FIG. 1, a light-shielding sheet 190 is provided between the second lens 120 and the fourth lens 130, a filter 200 is disposed on the image side of the seventh lens 170, and an image pickup element 300 is disposed on the image side of the filter 200. FIG. 1

[0108] ​In the present embodiment, the effective focal length f of the lens system as a whole is 1.023 mm, the total track d is 13.611 mm, the image space F / # is 2.02, the maximum field of angle is 115 degrees, the entrance pupil diameter HEP is 0.507 mm, and the maximum image height HOI is 2.139 mm.

[0109] The physical properties of each surface of the wide-angle lens 1000 of the present embodiment are shown in Table 1, and the aspheric coefficients of each surface of the wide-angle lens 1000 of the present embodiment are shown in Table 2-1 and Table 2-2.

[0110] (Table 1)

[0111]

[0112] In Table 1 above, the units of the radius of curvature, the thickness, the focal length, and the effective radius are mm, Nd is the refractive index for a light ray of 587.56 nm, νd is the Abbe number, and * indicates an aspheric surface.

[0113] (Table 2-1)

[0114]

[0115] (Table 2-2)

[0116] Surface A8 A10 A12 A14 A16 3 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 4 -3.29328E-03 2.82298E-03 -4.88754E-04 0.00000E+00 0.00000E+00 5 -5.12306E-03 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 6 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 7 4.37857E-03 2.92148E-03 0.00000E+00 0.00000E+00 0.00000E+00 8 -5.94177E-03 1.11565E-02 0.00000E+00 0.00000E+00 0.00000E+00 12 1.79956E-02 -7.87537E-04 -1.30556E-03 0.00000E+00 0.00000E+00 13 1.73181E-01 -4.77496E-02 4.65741E-03 0.00000E+00 0.00000E+00 14 1.34046E-02 -4.35536E-03 5.73510E-04 0.00000E+00 0.00000E+00

[0117] In Table 2-1 and Table 2-2 above, the radius of curvature is set to a positive value in the case where the lens surface is a convex surface protruding toward the object side or a concave surface recessed toward the object side, and the radius of curvature is set to a negative value in the case where the lens surface is a convex surface protruding toward the image side or a concave surface recessed toward the image side.

[0118] Further, in Table 2-1 and Table 2-2 above, the aspheric coefficients A4, A6, A8, A10, A12, A14, and A16 at the time of expressing the aspheric shape of each surface are shown by the following formula (Mathematical Formula 1). In the following formula, the sag amount (the axis in the optical axis direction) is set to Z, the height in the direction perpendicular to the optical axis (the ray height) is set to r, the conic coefficient is set to K, and the reciprocal of the radius of curvature is set to c.

[0119] [Mathematical Formula 1]

[0120]

[0121] In this case, in the wide-angle lens 1000, the combined focal distance f 12 of the first lens 110 and the second lens 120 is -1.338 mm, and the maximum image height HOI is 2.139 mm, and thus the following condition 1 is satisfied:

[0122] -1.000 < f 12 / HOI < -0.400.

[0123] In the condition 1, if f 12 / HOI is -1.000 or less, the lens diameter increases, the object-image distance increases, and it is difficult to achieve the miniaturization of the entire wide-angle lens. On the other hand, if f 12 / HOI is -0.400 or more, the negative power is too strong, and it is difficult to appropriately correct the field curvature, the lateral chromatic aberration, and the coma.

[0124] In contrast, in the present embodiment, since the condition 1 is satisfied, the object-image distance can be reduced, and thus the miniaturization of the entire wide-angle lens can be achieved, and the field curvature, the lateral chromatic aberration, and the coma can be appropriately corrected, and thus excellent optical characteristics can be achieved.

[0125] In particular, in the present embodiment, since the relationship of -0.700 < f 12 / HOI < -0.500 is satisfied, the object-image distance can be further reduced, and thus the miniaturization of the entire wide-angle lens can be achieved, and the field curvature, the lateral chromatic aberration, and the coma can be more appropriately corrected, and thus excellent optical characteristics can be achieved.

[0126] Further, in the wide-angle lens 1000, the effective radius sd 11 of the object side lens surface of the first lens 110 is 6.456 mm, and the maximum image height HOI is 2.139 mm, and thus the following condition 2 is satisfied:

[0127] 2.000 < sd 11 / HOI < 4.000.

[0128] In the condition 2, if sd 11 / HOI is 2.000 or less, the position at which the light beam on the optical axis passes and the position at which the light beam outside the optical axis passes are close to each other, and it is difficult to correct the field curvature well. On the other hand, if sd 11 / HOI is 4.000 or more, the diameter of the first lens 110 is large, and it is difficult to achieve the miniaturization of the wide-angle lens.

[0129] In contrast, in the present embodiment, since the condition 2 is satisfied, the position at which the light beam on the optical axis passes and the position at which the light beam outside the optical axis passes can be separated, and thus the field curvature can be corrected well, and the diameter of the first lens can be suppressed, and thus the miniaturization of the wide-angle lens can be more easily achieved.

[0130] Further, in the wide-angle lens 1000, the object-image distance d is 13.611 mm, and the maximum image height HOI is 2.139 mm, and thus the following condition 3 is satisfied:

[0131] 5.000 < d / HOI < 8.000.

[0132] In the condition 3, if d / HOI is 5.000 or less, it is not easy to correct various aberrations well, and on the other hand, if d / HOI is 8.000 or more, the lens diameter and the object-image distance are large, and it is not easy to realize the miniaturization of the entire wide-angle lens.

[0133] On the contrary, in the present embodiment, since the condition 3 is satisfied, various aberrations can be corrected well, and the lens diameter and the object-image distance can be reduced, and thus the miniaturization of the entire wide-angle lens can be realized.

[0134] In particular, in the present embodiment, since the relationship of 6.000 < d / HOI < 7.000 is satisfied, various aberrations can be corrected more well, and the lens diameter and the object-image distance can be further reduced, and thus the miniaturization of the entire wide-angle lens can be realized.

[0135] Further, in the wide-angle lens 1000, the third lens 130 is a positive lens with a convex surface toward the image side, the fourth lens 140 is a positive lens with a convex surface toward the image side, the fifth lens 150 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, the sixth lens 160 is a negative lens with a concave surface toward the image side, the seventh lens 170 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, and the composite focal distance f1234 of the first lens 110, the second lens 120, the third lens 130, and the fourth lens 140 is 3.148 mm, and the composite focal distance f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.740 mm, and thus the following condition 4 is satisfied:

[0136] 0.800 < f1234 / f567 < 8.000.

[0137] In the condition 4, if f1234 / f is 2.500 or less, the power of the front lens group constituted by the first lens, the second lens, the third lens, and the fourth lens is too strong, and it is not easy to correct various aberrations appropriately, and on the other hand, if f1234 / f is 8.000 or more, the power of the front lens group constituted by the first lens, the second lens, the third lens, and the fourth lens is too weak, and it is not easy to reduce the diameters of the respective lenses of the front lens group, and it is not easy to realize the miniaturization of the entire wide-angle lens.

[0138] On the contrary, in the present embodiment, since the condition 4 is satisfied, there are advantages that it is easier to appropriately correct various aberrations and to realize miniaturization.

[0139] Further, in the wide-angle lens 1000, the third lens 130 is a positive lens with a convex surface toward the image side, the fourth lens 140 is a positive lens with a convex surface toward the image side, the fifth lens 150 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, the sixth lens 160 is a negative lens with a concave surface toward the image side, the seventh lens 170 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, and the composite focal length f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.740 mm, and the focal length f of the entire lens system is 1.023 mm, and thus the following condition 5 is satisfied:

[0140] 2.800 < f567 / f < 3.850

[0141] In the condition 5, if f567 / f is 2.800 or less, the power of the rear lens group composed of the fifth lens, the sixth lens, and the seventh lens is too strong, and it is not easy to appropriately correct various aberrations, particularly chromatic aberration, and on the other hand, if f567 / f is 3.850 or more, it is not easy to reduce the diameters of the lenses and the object-image distance, and it is not easy to realize miniaturization of the entire wide-angle lens.

[0142] On the contrary, in the present embodiment, since the condition 5 is satisfied, there are advantages that it is easy to appropriately correct various aberrations, particularly chromatic aberration, and to realize miniaturization.

[0143] Further, in the wide-angle lens 1000, the object-image distance d is 13.611 mm, and the focal length f of the entire lens system is 1.023 mm, and thus the following condition 6 is satisfied:

[0144] 11.000 < d / f < 15.000

[0145] In the condition 6, if d / f is 11.000 or less, it is not easy to appropriately correct various aberrations, and on the other hand, if d / f is 15.000 or more, the length of the entire lens system becomes too long.

[0146] On the contrary, in the present embodiment, since the condition 6 is satisfied, it is easy to appropriately correct various aberrations, it is easy to obtain excellent optical characteristics, and it is possible to suppress the lens system from becoming too large while avoiding the length of the entire lens system from becoming too long.

[0147] Further, in the wide-angle lens 1000, the focal distance f of the entire lens system is 1.023 mm, the half field angle θ is 115 / 180, and the maximum image height HOI is 2.139 mm, and the relationship fθ < HOI < 2f tan(θ / 2) is satisfied, and thus, it is easy to realize an imaging lens that can project an image of a peripheral portion to a larger extent, and it is possible to suppress the distortion aberration of the peripheral portion.

[0148] As described above, in the present embodiment, the wide-angle lens 1000 is configured in the above-described manner, and as shown in FIG. 10, it is possible to reduce the object-image distance, and thus, it is possible to realize a small size of the entire wide-angle lens, and it is easy to appropriately correct the field curvature, the lateral chromatic aberration, and the coma aberration, and thus, it is possible to realize excellent optical characteristics. FIG. 2A to FIG. 4L

[0149] (Embodiment 2)

[0150] FIG. 5 FIG. 11 is a view showing a wide-angle lens according to Embodiment 2 of the present application, FIG. 6A FIG. 12 is a view showing the field curvature and the distortion of the wide-angle lens according to Embodiment 2 of the present application, FIG. 6B FIG. 13 is a view showing the field curvature and the distortion of the wide-angle lens according to Embodiment 2 of the present application, FIG. 7A FIG. 14 is a view showing the lateral chromatic aberration (lateral color) of the wide-angle lens according to Embodiment 2 of the present application, FIG. 7B FIG. 15 is a view showing the spherical aberration (longitudinal chromatic aberration) of the wide-angle lens according to Embodiment 2 of the present application, FIG. 8A to FIG. 8L FIG. 16 is a view showing the lateral chromatic aberration of the wide-angle lens according to Embodiment 2 of the present application. In this case, in FIG. 6A FIG. 6B FIG. 7A FIG. 7B FIG. 8A to FIG. 8L In FIGS. 11 to 16, the relevant curve of red light R (wavelength: 656 nm) is denoted by R, the relevant curve of green light G (wavelength: 588 nm) is denoted by G, the relevant curve of blue light B (wavelength: 486 nm) is denoted by B, T indicates the meridional plane, S indicates the sagittal plane, and in FIG. 8A to FIG. 8L

[0151] As shown in FIG. 10, the wide-angle lens 1000 includes, in order from the object side (L1 side), a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, an aperture 180, a fifth lens 150, a sixth lens 160, and a seventh lens 170, in which the sixth lens 160 and the seventh lens 170 are bonded together by an adhesive to constitute a cemented lens. FIG. 5

[0152] ​​​​​​​Here, since the basic structure of the wide-angle lens 1000 in this embodiment (i.e., whether the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, and the seventh lens 170 have positive or negative refractive power, are glass lenses or plastic lenses, whether the object-side surface and the image-side surface are convex or concave, and whether they are spherical or aspherical) is the same as that of the wide-angle lens in Embodiment 1, detailed explanation is not given here.

[0153] Further, as shown in FIG. 1, like Embodiment 1, a light-shielding plate 190 is provided between the second lens 120 and the fourth lens 130, a filter 200 is disposed on the image side of the seventh lens 170, and an image pickup element 300 is disposed on the image side of the filter 200. FIG. 5

[0154] In this embodiment, the effective focal length f of the entire lens system is 1.062 mm, the total track d is 13.610 mm, the image space F / # is 2.02, the maximum field of angle is 115 degrees, the entrance pupil diameter HEP is 0.526 mm, and the maximum image height HOI is 2.139 mm.

[0155] The physical properties of each surface of the wide-angle lens 1000 of this embodiment are shown in Table 3, and the aspherical coefficients of each surface of the wide-angle lens 1000 of this embodiment are shown in Table 4-1 and Table 4-2.

[0156] (Table 3)

[0157]

[0158] In Table 3 above, the units of the radius of curvature, the thickness, the effective focal length, and the effective radius are mm, Nd is the refractive index for a light ray of 587.56 nm, νd is the Abbe number, and * indicates an aspherical surface.

[0159] (Table 4-1)

[0160]

[0161] (Table 4-2)

[0162] Surface A8 A10 A12 A14 A16 3 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 4 1.18832E-02 -3.21383E-03 7.23623E-04 0.00000E+00 0.00000E+00 5 -7.11892E-03 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 6 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 7 1.48329E-02 -9.20347E-04 0.00000E+00 0.00000E+00 0.00000E+00 8 3.16264E-03 4.17741E-03 0.00000E+00 0.00000E+00 0.00000E+00 12 -7.44565E-04 -1.42901E-03 0.00000E+00 0.00000E+00 0.00000E+00 13 1.80337E-01 -4.80759E-02 4.57265E-03 0.00000E+00 0.00000E+00 14 1.50208E-02 -4.69107E-03 5.90742E-04 0.00000E+00 0.00000E+00

[0163] ​In Tables 4-1 and 4-2 above, the curvature radius is set to a positive value in the case where the lens surface is a convex surface protruding toward the object side or a concave surface recessed toward the object side, and is set to a negative value in the case where the lens surface is a convex surface protruding toward the image side or a concave surface recessed toward the image side.

[0164] Further, in Tables 4-1 and 4-2 above, the aspheric coefficients A4, A6, A8, A10, A12, A14, and A16 at the time of expressing the aspheric shape of each surface by the above mathematical expression 1 are shown.

[0165] Here, in the wide-angle lens 1000, the combined focal distance f12 of the first lens 110 and the second lens 120 is -1.406 mm, and the maximum image height HOI is 2.139 mm, and thus the following condition 1 is satisfied:

[0166] -1.000 < f12 / HOI < -0.400.

[0167] In the condition 1, if f12 / HOI is -1.000 or less, the lens diameter increases, the object-image distance increases, and it is difficult to achieve the miniaturization of the entire wide-angle lens. On the other hand, if f12 / HOI is -0.400 or more, the negative refractive power is too strong, and it is difficult to appropriately correct the field curvature, the lateral chromatic aberration, and the coma.

[0168] In contrast to this, in the present embodiment, since the condition 1 is satisfied, the object-image distance can be reduced, and thus the miniaturization of the entire wide-angle lens can be achieved, and the field curvature, the lateral chromatic aberration, and the coma can be appropriately corrected, and thus excellent optical characteristics can be achieved.

[0169] In particular, in the present embodiment, since the relationship -0.700 < f12 / HOI < -0.500 is satisfied, the object-image distance can be further reduced, and thus the miniaturization of the entire wide-angle lens can be achieved, and the field curvature, the lateral chromatic aberration, and the coma can be more appropriately corrected, and thus excellent optical characteristics can be achieved.

[0170] Further, in the wide-angle lens 1000, the effective radius sd11 of the object side lens surface of the first lens 110 is 6.449 mm, and the maximum image height HOI is 2.139 mm, and thus the following condition 2 is satisfied:

[0171] 2.000 < sd11 / HOI < 4.000.

[0172] In the condition 2, if sdll / HOI is 2.000 or less, the position of the light beam passing on the optical axis and the position of the light beam passing outside the optical axis are close to each other, and it is difficult to correct the field curvature well. On the other hand, if sdll / HOI is 4.000 or more, the diameter of the first lens 110 is large, and it is difficult to realize the miniaturization of the wide-angle lens.

[0173] On the contrary, in the present embodiment, since the condition 2 is satisfied, the position of the light beam passing on the optical axis and the position of the light beam passing outside the optical axis can be separated, and thus the field curvature can be corrected well, and the diameter of the first lens can be suppressed, and thus the miniaturization of the wide-angle lens can be more easily realized.

[0174] Further, in the wide-angle lens 1000, the object-image distance d is 13.610 mm, and the maximum image height HOI is 2.139 mm, and thus the following condition 3 is satisfied:

[0175] 5.000 < d / HOI < 8.000

[0176] In the condition 3, if d / HOI is 5.000 or less, it is difficult to correct various aberrations well. On the other hand, if d / HOI is 8.000 or more, the lens diameter and the object-image distance are large, and it is difficult to realize the miniaturization of the entire wide-angle lens.

[0177] On the contrary, in the present embodiment, since the condition 3 is satisfied, various aberrations can be corrected well, and the lens diameter and the object-image distance can be reduced, and thus the miniaturization of the entire wide-angle lens can be realized.

[0178] In particular, in the present embodiment, since the relationship of 6.000 < d / HOI < 7.000 is satisfied, various aberrations can be more well corrected, and the lens diameter and the object-image distance can be further reduced, and thus the miniaturization of the entire wide-angle lens can be realized.

[0179] Further, in the wide-angle lens 1000, the third lens 130 is a positive lens with a convex surface toward the image side, the fourth lens 140 is a positive lens with a convex surface toward the image side, the fifth lens 150 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, the sixth lens 160 is a negative lens with a concave surface toward the image side, the seventh lens 170 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, and the composite focal distance f1234 of the first lens 110, the second lens 120, the third lens 130, and the fourth lens 140 is 4.237 mm, and the composite focal distance f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.640 mm, and thus the following condition 4 is satisfied:

[0180] 0.800 < f1234 / f567 < 8.000.

[0181] In the condition 4, if f1234 / f is 2.500 or less, the power of the front lens group composed of the first lens, the second lens, the third lens, and the fourth lens is too strong, and it is not easy to appropriately correct various aberrations. On the other hand, if f1234 / f is 8.000 or more, the power of the front lens group composed of the first lens, the second lens, the third lens, and the fourth lens is too weak, and it is not easy to reduce the diameter of each lens of the front lens group, and it is not easy to achieve the miniaturization of the wide-angle lens as a whole.

[0182] On the contrary, in the present embodiment, since the condition 4 is satisfied, there are advantages that it is easier to appropriately correct various aberrations and easier to achieve the miniaturization.

[0183] Further, in the wide-angle lens 1000, the third lens 130 is a positive lens with a convex surface toward the image side, the fourth lens 140 is a positive lens with a convex surface toward the image side, the fifth lens 150 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, the sixth lens 160 is a negative lens with a concave surface toward the image side, the seventh lens 170 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, and the composite focal distance f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.640 mm, and the focal distance f of the lens system as a whole is 1.062 mm, and thus the following condition 5 is satisfied:

[0184] 2.800 < f567 / f < 3.850

[0185] In the condition 5, if f567 / f is 2.800 or less, the power of the rear lens group composed of the fifth lens, the sixth lens, and the seventh lens is too strong, and it is not easy to appropriately correct various aberrations, particularly chromatic aberration. On the other hand, if f567 / f is 3.850 or more, it is not easy to reduce the diameter of each lens and the object-image distance, and it is not easy to achieve the miniaturization of the wide-angle lens as a whole.

[0186] On the contrary, in the present embodiment, since the condition 5 is satisfied, there are advantages that it is easier to appropriately correct various aberrations, particularly chromatic aberration, and easier to achieve the miniaturization.

[0187] Further, in the wide-angle lens 1000, the object-image distance d is 13.610 mm, and the focal distance f of the lens system as a whole is 1.062 mm, and thus the following condition 6 is satisfied:

[0188] 11.000 < d / f < 15.000

[0189] In Condition 6, if d / f is 11.000 or less, it is difficult to appropriately correct various aberrations, and on the other hand, if d / f is 15.000 or more, the length of the entire lens system becomes excessively long.

[0190] On the contrary, in the present embodiment, since Condition 6 is satisfied, it is easy to appropriately correct various aberrations, it is easy to obtain excellent optical characteristics, and it is possible to suppress the lens system from becoming excessively large while avoiding the length of the entire lens system from becoming excessively long.

[0191] Further, in the wide-angle lens 1000, the focal distance f of the entire lens system is 1.062 mm, the half field angle θ is 115 / 180, and the maximum image height HOI is 2.139 mm, and the relationship of fθ < HOI < 2f tan(θ / 2) is satisfied, and therefore, it is easy to realize an imaging lens which can project an image of the peripheral portion to a larger extent, and it is possible to suppress the distortion aberration of the peripheral portion.

[0192] As described above, in the present embodiment, by constituting the wide-angle lens 1000 in the above-described manner, as shown in FIG. 17, it is possible to reduce the object-image distance, thereby realizing the miniaturization of the entire wide-angle lens, and it is easy to appropriately correct the field curvature, the lateral chromatic aberration, and the coma, and thereby it is possible to realize excellent optical characteristics. FIG. 6A to FIG. 8L

[0193] (Embodiment 3)

[0194] FIG. 9 is a view showing a wide-angle lens of Embodiment 3 of the present application, FIG. 10A is a view showing the field curvature and the distortion of the wide-angle lens of Embodiment 3 of the present application, FIG. 10B is a view showing the field curvature and the distortion of the wide-angle lens of Embodiment 3 of the present application, FIG. 11A is a view showing the sagittal chromatic aberration (lateral chromatic aberration) of the wide-angle lens of Embodiment 3 of the present application, FIG. 11B is a view showing the spherical aberration (longitudinal chromatic aberration) of the wide-angle lens of Embodiment 3 of the present application, FIG. 12A to FIG. 12L is a view showing the lateral chromatic aberration of the wide-angle lens of Embodiment 3 of the present application. In this case, in FIG. 10A , FIG. 10B , FIG. 11A , FIG. 11B , FIG. 12A to FIG. 12L , the relevant curve of red light R (wavelength: 656 nm) is denoted by R, the relevant curve of green light G (wavelength: 588 nm) is denoted by G, the relevant curve of blue light B (wavelength: 486 nm) is denoted by B, T indicates the meridional plane, S indicates the sagittal plane, and in FIG. 12A to FIG. 12L ​In this embodiment, the maximum scale of the longitudinal axis is ±50.000 μm.

[0195] As shown in FIG. 1, the wide-angle lens 1000 includes, in order from the object side (L1 side), a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, an aperture 180, a fifth lens 150, a sixth lens 160, and a seventh lens 170, wherein the sixth lens 160 and the seventh lens 170 are bonded together by an adhesive to constitute a bonded lens. FIG. 9

[0196] In this embodiment, the basic structure of the wide-angle lens 1000 (i.e., whether the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, and the seventh lens 170 have positive or negative refractive power, are glass lenses or plastic lenses, whether the object-side surface and the image-side surface are convex or concave, and whether they are spherical or aspherical) is the same as that of the wide-angle lens in Embodiment 1, and thus will not be described in detail here.

[0197] In addition, as shown in FIG. 1, like Embodiment 1, a light shield 190 is provided between the second lens 120 and the fourth lens 130, a filter 200 is disposed on the image side of the seventh lens 170, and an image pickup element 300 is disposed on the image side of the filter 200. FIG. 9

[0198] In this embodiment, the effective focal length f of the entire lens system is 1.026 mm, the total track d is 13.403 mm, the image space F / # is 2.02, the maximum field of angle is 109 degrees, the entrance pupil diameter HEP is 0.508 mm, and the maximum image height HOI is 2.135 mm.

[0199] The physical properties of each surface of the wide-angle lens 1000 of this embodiment are shown in Table 5, and the aspherical coefficients of each surface of the wide-angle lens 1000 of this embodiment are shown in Table 6-1 and Table 6-2.

[0200] (Table 5)

[0201]

[0202] In Table 5 above, the units of the radius of curvature, the thickness, the focal length, and the effective radius are mm, Nd is the refractive index for a light ray of 587.56 nm, νd is the Abbe number, and * indicates an aspherical surface.

[0203] ​​(Table 6-1)

[0204]

[0205] (Table 6-2)

[0206] Surface A8 A10 A12 A14 A16 3 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 4 -1.08170E-02 3.74135E-03 0.00000E+00 0.00000E+00 0.00000E+00 5 -6.95368E-04 2.73435E-05 0.00000E+00 0.00000E+00 0.00000E+00 6 2.29705E-03 -1.23857E-05 0.00000E+00 0.00000E+00 0.00000E+00 7 8.85677E-03 -7.73714E-05 0.00000E+00 0.00000E+00 0.00000E+00 8 4.43504E-03 9.66329E-04 0.00000E+00 0.00000E+00 0.00000E+00 12 3.37862E-04 9.82658E-03 -3.53648E-03 -1.65685E-04 0.00000E+00 13 1.49413E-01 -7.49877E-02 2.96657E-02 -5.71297E-03 0.00000E+00 14 5.78846E-02 -2.66940E-02 6.28648E-03 -5.86821E-04 0.00000E+00

[0207] In Tables 6-1 and 6-2 above, in the case where the lens surface is a convex surface protruding toward the object side or a concave surface recessed toward the object side, the curvature radius is set to a positive value, and in the case where the lens surface is a convex surface protruding toward the image side or a concave surface recessed toward the image side, the curvature radius is set to a negative value.

[0208] Further, in Tables 6-1 and 6-2 above, the aspheric coefficients A4, A6, A8, A10, A12, A14, and A16 at the time of expressing the aspheric shape of each surface by the above mathematical expression 1 are shown.

[0209] Here, in the wide-angle lens 1000, the combined focal distance f12 of the first lens 110 and the second lens 120 is -1.467 mm, and the maximum image height HOI is 2.135 mm, and thus the following condition 1 is satisfied:

[0210] -1.000 < f12 / HOI < -0.400.

[0211] In the condition 1, if f12 / HOI is -1.000 or less, the lens diameter increases, the object-image distance increases, and it is difficult to achieve the miniaturization of the entire wide-angle lens, and on the other hand, if f12 / HOI is -0.400 or more, the negative refractive power is too strong, and it is difficult to appropriately correct the field curvature, the lateral chromatic aberration, and the coma.

[0212] On the contrary, in the present embodiment, since the condition 1 is satisfied, the object-image distance can be reduced, and thus the miniaturization of the entire wide-angle lens can be achieved, and the field curvature, the lateral chromatic aberration, and the coma can be easily and appropriately corrected, and thus excellent optical characteristics can be achieved.

[0213] In particular, in the present embodiment, since the relation -0.700 < f12 / HOI < -0.500 is satisfied, the object-image distance can be further reduced, and thus the miniaturization of the entire wide-angle lens can be achieved, and the field curvature, the lateral chromatic aberration, and the coma can be more easily and appropriately corrected, and thus excellent optical characteristics can be achieved.

[0214] Further, in the wide-angle lens 1000, the effective radius sd11 of the object side lens surface of the first lens 110 is 5.722 mm, and the maximum image height HOI is 2.135 mm, and thus the following condition 2 is satisfied:

[0215] 2.000 < sdll / HOI < 4.000.

[0216] In condition 2, if sdll / HOI is 2.000 or less, the position where the light beam on the optical axis passes is close to the position where the light beam outside the optical axis passes, and it is difficult to correct the field curvature well. On the other hand, if sdll / HOI is 4.000 or more, the diameter of the first lens 110 is large, and it is difficult to realize the miniaturization of the wide-angle lens.

[0217] In contrast, in the present embodiment, since condition 2 is satisfied, the position where the light beam on the optical axis passes can be separated from the position where the light beam outside the optical axis passes, so that the field curvature can be corrected well, and the diameter of the first lens can be suppressed, so that the miniaturization of the wide-angle lens is more easily realized.

[0218] Further, in the wide-angle lens 1000, the object-image distance d is 13.403 mm, and the maximum image height HOI is 2.135 mm, and thus condition 3 below is satisfied:

[0219] 5.000 < d / HOI < 8.000

[0220] In condition 3, if d / HOI is 5.000 or less, it is difficult to correct various aberrations well. On the other hand, if d / HOI is 8.000 or more, the lens diameter and the object-image distance are large, and it is difficult to realize the miniaturization of the wide-angle lens as a whole.

[0221] In contrast, in the present embodiment, since condition 3 is satisfied, various aberrations can be corrected well, and the lens diameter and the object-image distance can be reduced, so that the miniaturization of the wide-angle lens as a whole is realized.

[0222] In particular, in the present embodiment, since the relationship of 6.000 < d / HOI < 7.000 is satisfied, various aberrations can be corrected more well, and the lens diameter and the object-image distance can be further reduced, so that the miniaturization of the wide-angle lens as a whole is realized.

[0223] Further, in the wide-angle lens 1000, the third lens 130 is a positive lens with a convex surface toward the image side, the fourth lens 140 is a positive lens with a convex surface toward the image side, the fifth lens 150 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, the sixth lens 160 is a negative lens with a concave surface toward the image side, the seventh lens 170 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, and the composite focal distance f1234 of the first lens 110, the second lens 120, the third lens 130, and the fourth lens 140 is 3.572 mm, and the composite focal distance f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.663 mm, and thus condition 4 below is satisfied:

[0224] 0.800 < f1234 / f567 < 8.000.

[0225] In the condition 4, if f1234 / f is 2.500 or less, the power of the front lens group composed of the first lens, the second lens, the third lens, and the fourth lens is too strong, and it is not easy to appropriately correct various aberrations. On the other hand, if f1234 / f is 8.000 or more, the power of the front lens group composed of the first lens, the second lens, the third lens, and the fourth lens is too weak, and it is not easy to reduce the diameter of each lens of the front lens group and to achieve the miniaturization of the wide-angle lens as a whole.

[0226] On the contrary, in the present embodiment, since the condition 4 is satisfied, there are advantages that it is easier to appropriately correct various aberrations and to achieve the miniaturization.

[0227] Further, in the wide-angle lens 1000, the third lens 130 is a positive lens with a convex surface toward the image side, the fourth lens 140 is a positive lens with a convex surface toward the image side, the fifth lens 150 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, the sixth lens 160 is a negative lens with a concave surface toward the image side, the seventh lens 170 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, and the composite focal distance f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.663 mm, and the focal distance f of the lens system as a whole is 1.026 mm, and thus the following condition 5 is satisfied:

[0228] 2.800 < f567 / f < 3.850

[0229] In the condition 5, if f567 / f is 2.800 or less, the power of the rear lens group composed of the fifth lens, the sixth lens, and the seventh lens is too strong, and it is not easy to appropriately correct various aberrations, particularly chromatic aberration. On the other hand, if f567 / f is 3.850 or more, it is not easy to reduce the diameter of each lens and the object-image distance, and to achieve the miniaturization of the wide-angle lens as a whole.

[0230] On the contrary, in the present embodiment, since the condition 5 is satisfied, there are advantages that it is easier to appropriately correct various aberrations, particularly chromatic aberration, and to achieve the miniaturization.

[0231] Further, in the wide-angle lens 1000, the object-image distance d is 13.403 mm, and the focal distance f of the lens system as a whole is 1.026 mm, and thus the following condition 6 is satisfied:

[0232] 11.000 < d / f < 15.000

[0233] In condition 6, if d / f is 11.000 or less, it is difficult to appropriately correct various aberrations, and on the other hand, if d / f is 15.000 or more, the length of the entire lens system becomes excessively long.

[0234] On the contrary, in the present embodiment, since condition 6 is satisfied, it is easy to appropriately correct various aberrations, it is easy to obtain excellent optical characteristics, and it is possible to suppress the lens system from becoming excessively large while avoiding the length of the entire lens system from becoming excessively long.

[0235] Further, in the wide-angle lens 1000, the focal distance f of the entire lens system is 1.026 mm, the half field angle θ is 109 / 180, and the maximum image height HOI is 2.135 mm, and the relationship of fθ < HOI < 2f tan(θ / 2) is satisfied, and therefore, it is easy to realize an imaging lens which can project an image of the peripheral portion to a larger extent, and it is possible to suppress the distortion aberration of the peripheral portion.

[0236] As described above, in the present embodiment, by configuring the wide-angle lens 1000 in the above-described manner, as shown in FIG. 16A, it is possible to reduce the object image distance, thereby realizing the miniaturization of the entire wide-angle lens, and it is easy to appropriately correct the field curvature, the lateral chromatic aberration, and the coma, and therefore, it is possible to realize excellent optical characteristics. FIG. 10A to FIG. 12L

[0237] (Embodiment 4)

[0238] FIG. 13 is a diagram illustrating the field curvature and the distortion of the wide-angle lens of the present embodiment 4, FIG. 14A is a diagram illustrating the field curvature and the distortion of the wide-angle lens of the present embodiment 4, FIG. 14B is a diagram illustrating the field curvature and the distortion of the wide-angle lens of the present embodiment 4, FIG. 15A is a diagram illustrating the lateral chromatic aberration (transverse chromatic aberration) of the wide-angle lens of the present embodiment 4, FIG. 15B is a diagram illustrating the spherical aberration (longitudinal chromatic aberration) of the wide-angle lens of the present embodiment 4, FIG. 16A Figs. 16A to 16L are diagrams illustrating the transverse chromatic aberration of the wide-angle lens of the present embodiment 4. Here, in Figs. 14A, FIG. 14B , FIG. 15A , FIG. 15B , FIG. 16A to FIG. 16L In Figs. 14A to 16L, the relevant curve of red light R (wavelength: 656 nm) is denoted by R, the relevant curve of green light G (wavelength: 588 nm) is denoted by G, the relevant curve of blue light B (wavelength: 486 nm) is denoted by B, T indicates the meridional plane, S indicates the sagittal plane, and in FIG. 16A to FIG. 16L ​In this embodiment, the maximum scale of the longitudinal axis is ±50.000 μm.

[0239] As FIG. 13 illustrated, the wide-angle lens 1000 includes, in order from the object side (L1 side), a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, an aperture 180, a fifth lens 150, a sixth lens 160, and a seventh lens 170, wherein the sixth lens 160 and the seventh lens 170 are bonded together by an adhesive to constitute a bonded lens.

[0240] Here, since the basic structure of the wide-angle lens 1000 in this embodiment (i.e., whether the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, and the seventh lens 170 have positive or negative refractive power, are glass lenses or plastic lenses, whether the object-side surface and the image-side surface are convex or concave, and whether they are spherical or aspherical) is the same as that of the wide-angle lens in Embodiment 1, detailed explanation is not given here.

[0241] Further, as FIG. 13 illustrated, like Embodiment 1, a light-shielding sheet 190 is provided between the second lens 120 and the fourth lens 130, a filter 200 is disposed on the image side of the seventh lens 170, and an image pickup element 300 is disposed on the image side of the filter 200.

[0242] In this embodiment, the effective focal length f of the entire lens system is 1.011 mm, the total track d is 13.404 mm, the image space F / # is 2.03, the maximum field of angle is 109 degrees, the entrance pupil diameter HEP is 0.498 mm, and the maximum image height HOI is 2.060 mm.

[0243] The physical properties of each surface of the wide-angle lens 1000 of this embodiment are shown in Table 7, and the aspherical coefficients of each surface of the wide-angle lens 1000 of this embodiment are shown in Table 8-1 and Table 8-2.

[0244] (Table 7)

[0245]

[0246] In Table 7 above, the units of the radius of curvature, the thickness, the focal length, and the effective radius are mm, Nd is the refractive index for a light ray of 587.56 nm, νd is the Abbe number, and * indicates an aspherical surface.

[0247] (Table 8-1)

[0248]

[0249] (Table 8-2)

[0250] Surface A8 A10 A12 A14 A16 3 -1.15147E-03 1.50789E-04 -7.30801E-06 0.00000E+00 0.00000E+00 4 7.01048E-02 -7.98133E-03 -4.17335E-03 0.00000E+00 0.00000E+00 5 1.21716E-02 -8.91664E-03 0.00000E+00 0.00000E+00 0.00000E+00 6 2.05279E-02 -2.11693E-02 5.41203E-03 0.00000E+00 0.00000E+00 7 6.15517E-03 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 8 8.49340E-03 3.83965E-03 -2.61241E-03 0.00000E+00 0.00000E+00 12 -5.25642E-02 5.03801E-02 -2.60337E-02 5.67639E-03 0.00000E+00 13 1.93193E-02 -2.02628E-02 1.27147E-02 -3.03203E-03 0.00000E+00 14 5.37377E-02 -2.41958E-02 5.72598E-03 -5.29799E-04 0.00000E+00

[0251] In Tables 8-1 and 8-2 above, in the case where the lens surface is a convex surface protruding toward the object side or a concave surface recessed toward the object side, the curvature radius is set to a positive value, and in the case where the lens surface is a convex surface protruding toward the image side or a concave surface recessed toward the image side, the curvature radius is set to a negative value.

[0252] Further, in Tables 8-1 and 8-2 above, the aspheric coefficients A4, A6, A8, A10, A12, A14, and A16 at the time when the aspheric shape of each surface is expressed by Mathematical Formula 1 above are shown.

[0253] Here, in the wide-angle lens 1000, the combined focal distance f12 of the first lens 110 and the second lens 120 is -1.347, and the maximum image height HOI is 2.060 mm, and thus the following Condition 1 is satisfied:

[0254] -1.000 < f12 / HOI < -0.400.

[0255] In Condition 1, if f12 / HOI is -1.000 or less, the lens diameter increases, the object-image distance increases, and it is difficult to achieve miniaturization of the entire wide-angle lens, and on the other hand, if f12 / HOI is -0.400 or more, the negative refractive power is too strong, and it is difficult to appropriately correct the field curvature, the lateral chromatic aberration, and the coma.

[0256] On the contrary, in the present embodiment, since Condition 1 is satisfied, the object-image distance can be reduced, and thus miniaturization of the entire wide-angle lens can be achieved, and the field curvature, the lateral chromatic aberration, and the coma can be appropriately corrected, and thus excellent optical characteristics can be achieved.

[0257] In particular, in the present embodiment, since the relationship -0.700 < f12 / HOI < -0.500 is satisfied, the object-image distance can be further reduced, and thus miniaturization of the entire wide-angle lens can be achieved, and the field curvature, the lateral chromatic aberration, and the coma can be more appropriately corrected, and thus excellent optical characteristics can be achieved.

[0258] Further, in the wide-angle lens 1000, the effective radius sd11 of the object side lens surface of the first lens 110 is 6.043 mm, and the maximum image height HOI is 2.060 mm, and thus the following Condition 2 is satisfied:

[0259] 2.000 < sdll / HOI < 4.000.

[0260] In condition 2, if sdll / HOI is 2.000 or less, the position where the light beam on the optical axis passes and the position where the light beam outside the optical axis passes are close to each other, and it is difficult to correct the field curvature well. On the other hand, if sdll / HOI is 4.000 or more, the diameter of the first lens 110 is large, and it is difficult to realize the miniaturization of the wide-angle lens.

[0261] In contrast, in the present embodiment, since condition 2 is satisfied, the position where the light beam on the optical axis passes and the position where the light beam outside the optical axis pass are separated from each other, and it is possible to correct the field curvature well, and it is possible to suppress the diameter of the first lens, and thus it is easier to realize the miniaturization of the wide-angle lens.

[0262] Further, in the wide-angle lens 1000, the object-image distance d is 13.404 mm, and the maximum image height HOI is 2.060 mm, and thus condition 3 below is satisfied:

[0263] 5.000 < d / HOI < 8.000

[0264] In condition 3, if d / HOI is 5.000 or less, it is difficult to correct various aberrations well. On the other hand, if d / HOI is 8.000 or more, the lens diameter and the object-image distance are large, and it is difficult to realize the miniaturization of the entire wide-angle lens.

[0265] In contrast, in the present embodiment, since condition 3 is satisfied, it is possible to correct various aberrations well, and it is possible to reduce the lens diameter and the object-image distance, and thus it is possible to realize the miniaturization of the entire wide-angle lens.

[0266] In particular, in the present embodiment, since the relationship 6.000 < d / HOI < 7.000 is satisfied, it is possible to correct various aberrations more well, and it is possible to further reduce the lens diameter and the object-image distance, and thus it is possible to realize the miniaturization of the entire wide-angle lens.

[0267] Further, in the wide-angle lens 1000, the third lens 130 is a positive lens whose convex surface faces the image side, the fourth lens 140 is a positive lens whose convex surface faces the image side, the fifth lens 150 is a positive lens whose convex surface faces the object side and whose convex surface faces the image side, the sixth lens 160 is a negative lens whose concave surface faces the image side, the seventh lens 170 is a positive lens whose convex surface faces the object side and whose convex surface faces the image side, and the composite focal distance f1234 of the first lens 110, the second lens 120, the third lens 130, and the fourth lens 140 is 6.571 mm, and the composite focal distance f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.355 mm, and thus condition 4 below is satisfied:

[0268] 0.800 < f1234 / f567 < 8.000.

[0269] In the condition 4, if f1234 / f is 2.500 or less, the power of the front lens group composed of the first lens, the second lens, the third lens, and the fourth lens is too strong, and it is not easy to appropriately correct various aberrations. On the other hand, if f1234 / f is 8.000 or more, the power of the front lens group composed of the first lens, the second lens, the third lens, and the fourth lens is too weak, and it is not easy to reduce the diameter of each lens of the front lens group and to achieve the miniaturization of the wide-angle lens as a whole.

[0270] On the contrary, in the present embodiment, since the condition 4 is satisfied, there are advantages that it is easier to appropriately correct various aberrations and to achieve the miniaturization.

[0271] Further, in the wide-angle lens 1000, the third lens 130 is a positive lens with a convex surface toward the image side, the fourth lens 140 is a positive lens with a convex surface toward the image side, the fifth lens 150 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, the sixth lens 160 is a negative lens with a concave surface toward the image side, the seventh lens 170 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, and the composite focal distance f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.355 mm, and the focal distance f of the lens system as a whole is 1.011 mm, and thus the following condition 5 is satisfied:

[0272] 2.800 < f567 / f < 3.850

[0273] In the condition 5, if f567 / f is 2.800 or less, the power of the rear lens group composed of the fifth lens, the sixth lens, and the seventh lens is too strong, and it is not easy to appropriately correct various aberrations, particularly chromatic aberration. On the other hand, if f567 / f is 3.850 or more, it is not easy to reduce the diameter of each lens and the object-image distance and to achieve the miniaturization of the wide-angle lens as a whole.

[0274] On the contrary, in the present embodiment, since the condition 5 is satisfied, there are advantages that it is easier to appropriately correct various aberrations, particularly chromatic aberration, and to achieve the miniaturization.

[0275] Further, in the wide-angle lens 1000, the object-image distance d is 13.404 mm, and the focal distance f of the lens system as a whole is 1.011 mm, and thus the following condition 6 is satisfied:

[0276] 11.000 < d / f < 15.000

[0277] In condition 6, if d / f is 11.000 or less, it is difficult to appropriately correct various aberrations, and on the other hand, if d / f is 15.000 or more, the length of the entire lens system becomes excessively long.

[0278] On the contrary, in the present embodiment, since condition 6 is satisfied, it is easy to appropriately correct various aberrations, it is easy to obtain excellent optical characteristics, and it is possible to suppress the lens system from becoming excessively large while avoiding the length of the entire lens system from becoming excessively long.

[0279] Further, in the wide-angle lens 1000, the focal distance f of the entire lens system is 1.011 mm, the half field angle θ is 109 / 180, and the maximum image height HOI is 2.060 mm, and the relationship of fθ < HOI < 2f tan(θ / 2) is satisfied, and therefore, it is easy to realize an imaging lens which can project an image of the peripheral portion to a larger extent, and it is possible to suppress the distortion aberration of the peripheral portion.

[0280] As described above, in the present embodiment, by constituting the wide-angle lens 1000 in the above-described manner, as shown in FIG. 20A, it is possible to reduce the object image distance, thereby realizing the miniaturization of the entire wide-angle lens, and it is easy to appropriately correct the field curvature, the lateral chromatic aberration, and the coma, and therefore, it is possible to realize excellent optical characteristics. FIG. 14A to FIG. 16L

[0281] (Embodiment 5)

[0282] FIG. 17 FIG. 18A is an explanatory view showing a wide-angle lens of the present embodiment 5, FIG. 18A FIG. 18B is an explanatory view showing the field curvature and the distortion of the wide-angle lens of the present embodiment 5, FIG. 18B FIG. 18C is an explanatory view showing the field curvature and the distortion of the wide-angle lens of the present embodiment 5, FIG. 19A FIG. 18D is an explanatory view showing the lateral chromatic aberration (lateral color) of the wide-angle lens of the present embodiment 5, FIG. 19B FIG. 18E is an explanatory view showing the spherical aberration (longitudinal aberration) of the wide-angle lens of the present embodiment 5, FIG. 20A FIGS. 20A to 20L are explanatory views showing the lateral aberration of the wide-angle lens of the present embodiment 5. Here, in FIG. 18A, FIG. 18B , FIG. 19A , FIG. 19B , FIG. 20A to FIG. 20L the relevant curve of red light R (wavelength: 656 nm) is denoted by R, the relevant curve of green light G (wavelength: 588 nm) is denoted by G, the relevant curve of blue light B (wavelength: 486 nm) is denoted by B, T indicates the meridional plane, S indicates the sagittal plane, and in FIG. 20A to FIG. 20L ​In this embodiment, the maximum scale of the longitudinal axis is ±50.000 μm.

[0283] As shown in FIG. 1, the wide-angle lens 1000 includes, in order from the object side (L1 side), a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, an aperture 180, a fifth lens 150, a sixth lens 160, and a seventh lens 170, wherein the sixth lens 160 and the seventh lens 170 are bonded together by an adhesive to constitute a bonded lens. FIG. 17

[0284] In this embodiment, the basic structure of the wide-angle lens 1000 (i.e., whether the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, and the seventh lens 170 have positive or negative refractive power, are glass lenses or plastic lenses, whether the object-side surface and the image-side surface are convex or concave, and whether they are spherical or aspherical) is the same as that of the wide-angle lens in Embodiment 1, and thus will not be described in detail here.

[0285] In addition, as shown in FIG. 1, like Embodiment 1, a light shield 190 is provided between the second lens 120 and the fourth lens 130, a filter 200 is disposed on the image side of the seventh lens 170, and an image pickup element 300 is disposed on the image side of the filter 200. FIG. 17 In this embodiment, the effective focal length f of the entire lens system is 1.021 mm, the total track d is 13.398 mm, the image space F / # is 2, the maximum field of angle is 108 degrees, the entrance pupil diameter HEP is 0.511 mm, and the maximum image height HOI is 1.934 mm.

[0286] The physical properties of each surface of the wide-angle lens 1000 of this embodiment are shown in Table 9, and the aspherical coefficients of each surface of the wide-angle lens 1000 of this embodiment are shown in Table 10-1 and Table 10-2.

[0287] (Table 9)

[0288]

[0289] In Table 9 above, the units of the radius of curvature, the thickness, the focal length, and the effective radius are mm, Nd is the refractive index for a light ray of 587.56 nm, νd is the Abbe number, and * indicates an aspherical surface.

[0290]

[0291] ​​(Table 10-1)

[0292]

[0293] (Table 10-2)

[0294] Surface A8 A10 A12 A14 A16 3 -1.12779E-03 1.69605E-04 -9.24708E-06 0.00000E+00 0.00000E+00 4 5.54759E-02 -1.43828E-02 -3.40212E-05 0.00000E+00 0.00000E+00 5 4.27755E-03 -5.97392E-03 0.00000E+00 0.00000E+00 0.00000E+00 6 1.27283E-03 -1.01399E-02 2.46941E-03 0.00000E+00 0.00000E+00 7 -2.19533E-02 8.91100E-03 0.00000E+00 0.00000E+00 0.00000E+00 8 -2.59952E-02 1.31396E-02 0.00000E+00 0.00000E+00 0.00000E+00 12 -5.53989E-03 2.10400E-02 -2.03506E-02 6.17103E-03 0.00000E+00 13 7.91865E-02 -3.44941E-02 3.84031E-03 7.90842E-04 0.00000E+00 14 4.18221E-02 -1.79457E-02 3.88481E-03 -3.05248E-04 0.00000E+00

[0295] In the above Table 10-1 and Table 10-2, the curvature radius is set to a positive value in the case where the lens surface is a convex surface protruding toward the object side or a concave surface recessed toward the object side, and is set to a negative value in the case where the lens surface is a convex surface protruding toward the image side or a concave surface recessed toward the image side.

[0296] Further, in the above Table 10-1 and Table 10-2, the aspherical coefficients A4, A6, A8, A10, A12, A14, A16 at the time of expressing the aspherical shape of each surface are shown by the above Mathematical Formula 1.

[0297] Here, in the wide-angle lens 1000, the combined focal distance f12 of the first lens 110 and the second lens 120 is -1.258, and the maximum image height HOI is 1.934 mm, and thus the following Condition 1 is satisfied:

[0298] -1.000 < f12 / HOI < -0.400.

[0299] In Condition 1, if f12 / HOI is -1.000 or less, the lens diameter increases, the object-image distance increases, and it is difficult to achieve the miniaturization of the entire wide-angle lens, and on the other hand, if f12 / HOI is -0.400 or more, the negative refractive power is too strong, and it is difficult to appropriately correct the field curvature, the lateral chromatic aberration, and the coma.

[0300] On the contrary, in the present embodiment, since Condition 1 is satisfied, the object-image distance can be reduced, and thus the miniaturization of the entire wide-angle lens can be achieved, and the field curvature, the lateral chromatic aberration, and the coma can be easily and appropriately corrected, and thus excellent optical characteristics can be achieved.

[0301] In particular, in the present embodiment, since the relationship -0.700 < f12 / HOI < -0.500 is satisfied, the object-image distance can be further reduced, and thus the miniaturization of the entire wide-angle lens can be achieved, and the field curvature, the lateral chromatic aberration, and the coma can be more easily and appropriately corrected, and thus excellent optical characteristics can be achieved.

[0302] Further, in the wide-angle lens 1000, the effective radius sd11 of the object side lens surface of the first lens 110 is 6.600 mm, and the maximum image height HOI is 1.934 mm, and thus the following Condition 2 is satisfied:

[0303] 2.000 < sdll / HOI < 4.000.

[0304] In condition 2, if sdll / HOI is 2.000 or less, the position where the light beam on the optical axis passes and the position where the light beam outside the optical axis passes are close to each other, and it is difficult to correct the field curvature well. On the other hand, if sdll / HOI is 4.000 or more, the diameter of the first lens 110 is large, and it is difficult to realize the miniaturization of the wide-angle lens.

[0305] In contrast, in the present embodiment, since condition 2 is satisfied, the position where the light beam on the optical axis passes and the position where the light beam outside the optical axis pass are separated from each other, and it is possible to correct the field curvature well, and it is possible to suppress the diameter of the first lens, and thus it is easier to realize the miniaturization of the wide-angle lens.

[0306] Further, in the wide-angle lens 1000, the object-image distance d is 13.398 mm, and the maximum image height HOI is 1.934 mm, and thus condition 3 below is satisfied:

[0307] 5.000 < d / HOI < 8.000

[0308] In condition 3, if d / HOI is 5.000 or less, it is difficult to correct various aberrations well, and on the other hand, if d / HOI is 8.000 or more, the lens diameter and the object-image distance are large, and it is difficult to realize the miniaturization of the entire wide-angle lens.

[0309] In contrast, in the present embodiment, since condition 3 is satisfied, it is possible to correct various aberrations well, and it is possible to reduce the lens diameter and the object-image distance, and thus it is possible to realize the miniaturization of the entire wide-angle lens.

[0310] In particular, in the present embodiment, since the relationship 6.000 < d / HOI < 7.000 is satisfied, it is possible to correct various aberrations more well, and it is possible to further reduce the lens diameter and the object-image distance, and thus it is possible to realize the miniaturization of the entire wide-angle lens.

[0311] Further, in the wide-angle lens 1000, the third lens 130 is a positive lens with a convex surface toward the image side, the fourth lens 140 is a positive lens with a convex surface toward the image side, the fifth lens 150 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, the sixth lens 160 is a negative lens with a concave surface toward the image side, the seventh lens 170 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, and the composite focal length f1234 of the first lens 110, the second lens 120, the third lens 130, and the fourth lens 140 is 4.142 mm, the composite focal length f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.679 mm, and thus the following condition 4 is satisfied:

[0312] 0.800 < f1234 / f567 < 8.000.

[0313] In the condition 4, if f1234 / f is 2.500 or less, the power of the front lens group composed of the first lens, the second lens, the third lens, and the fourth lens is too strong, and it is not easy to appropriately correct various aberrations. On the other hand, if f1234 / f is 8.000 or more, the power of the front lens group composed of the first lens, the second lens, the third lens, and the fourth lens is too weak, and it is not easy to reduce the diameters of the lenses of the front lens group and to achieve the miniaturization of the entire wide-angle lens.

[0314] On the contrary, in the present embodiment, since the condition 4 is satisfied, it has the advantages that it is easier to appropriately correct various aberrations and to achieve the miniaturization.

[0315] Further, in the wide-angle lens 1000, the third lens 130 is a positive lens with a convex surface toward the image side, the fourth lens 140 is a positive lens with a convex surface toward the image side, the fifth lens 150 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, the sixth lens 160 is a negative lens with a concave surface toward the image side, the seventh lens 170 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, and the composite focal length f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.679 mm, the focal length f of the entire lens system is 1.021 mm, and thus the following condition 5 is satisfied:

[0316] 2.800 < f567 / f < 3.850

[0317] In the condition 5, if f567 / f is 2.800 or less, the power of the rear lens group composed of the fifth lens, the sixth lens, and the seventh lens is too strong, and it is not easy to appropriately correct various aberrations, particularly, chromatic aberration. On the other hand, if f567 / f is 3.850 or more, it is not easy to reduce the diameters of the lenses and the object-image distance, and it is not easy to achieve the miniaturization of the entire wide-angle lens.

[0318] On the contrary, in the present embodiment, since the condition 5 is satisfied, it is easy to appropriately correct various aberrations, particularly chromatic aberration, and it is easy to achieve miniaturization.

[0319] Further, in the wide-angle lens 1000, the object-image distance d is 13.398 mm, the focal distance f of the entire lens system is 1.021 mm, and thus the following condition 6 is satisfied:

[0320] 11.000 < d / f < 15.000

[0321] In the condition 6, if d / f is 11.000 or less, it is not easy to appropriately correct various aberrations, and on the other hand, if d / f is 15.000 or more, the length of the entire lens system becomes too long.

[0322] On the contrary, in the present embodiment, since the condition 6 is satisfied, it is easy to appropriately correct various aberrations, it is easy to obtain excellent optical characteristics, and it is possible to suppress the entire lens system from becoming too large while avoiding the length of the entire lens system from becoming too long.

[0323] Further, in the wide-angle lens 1000, the focal distance f of the entire lens system is 1.021 mm, the half field angle θ is 108 / 180, and the maximum image height HOI is 1.934 mm, and thus the relationship fθ < HOI < 2f tan(θ / 2) is satisfied, and thus it is easy to achieve an imaging lens which can project an image of the peripheral portion to a larger extent, and it is possible to suppress the distortion aberration of the peripheral portion.

[0324] As described above, in the present embodiment, by configuring the wide-angle lens 1000 in the above-described manner, as shown in FIG. 10, it is possible to reduce the object-image distance, thereby achieving miniaturization of the entire wide-angle lens, and it is easy to appropriately correct the field curvature, the lateral chromatic aberration, and the coma, and thus it is possible to achieve excellent optical characteristics. FIG. 18A to FIG. 20L

[0325] (Embodiment 6)

[0326] FIG. 21 is a view showing a wide-angle lens of Embodiment 6 of the present application, FIG. 22A is a view showing the field curvature and the distortion of the wide-angle lens of Embodiment 6 of the present application, FIG. 22B is a view showing the field curvature and the distortion of the wide-angle lens of Embodiment 6 of the present application, FIG. 23A is a view showing the lateral chromatic aberration (transverse chromatic aberration) of the wide-angle lens of Embodiment 6 of the present application, FIG. 23B is a view showing the spherical aberration (longitudinal chromatic aberration) of the wide-angle lens of Embodiment 6 of the present application, FIG. 24A ​Figure 24L is an explanatory diagram showing the lateral aberration of the wide-angle lens according to Embodiment 6 of the present invention. Here, in Figure 22A, FIG. 22B , FIG. 23A , FIG. 23B , FIG. 24A to FIG. 24L In the diagram, the correlation curve for red light R (wavelength 656nm) is labeled R, the correlation curve for green light G (wavelength 588nm) is labeled G, and the correlation curve for blue light B (wavelength 486nm) is labeled B. T represents correlation with the meridional plane, and S represents correlation with the sagittal plane. Furthermore, in... FIG. 24A to FIG. 24L In the figure, the maximum scale of the vertical axis is ±50.000 μm.

[0327] like FIG. 21 As shown, the wide-angle lens 1000 includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, an aperture 180, a fifth lens 150, a sixth lens 160, and a seventh lens 170 arranged sequentially from the object side (L1 side). The sixth lens 160 and the seventh lens 170 are bonded together with an adhesive to form a joint lens.

[0328] Since the basic structure of the wide-angle lens 1000 in this embodiment (i.e., whether the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, and the seventh lens 170 have positive or negative optical power, whether they are glass lenses or plastic lenses, whether the object-side surface and the image-side surface are convex or concave, and whether they are spherical or aspherical) is the same as that of the wide-angle lens in Embodiment 1, it will not be elaborated on here.

[0329] In addition, such as FIG. 21 As shown, similar to Embodiment 1, a light-shielding sheet 190 is provided between the second lens 120 and the fourth lens 130, a filter 200 is provided on the image side of the seventh lens 170, and an image sensor 300 is provided on the image side of the filter 200.

[0330] In this embodiment, the overall focal length f (Effective Focal Length) of the lens system is 1.018 mm, the object-to-image distance d (Total Track) is 13.383 mm, the image space F / # is 2, the maximum field of view is 108 degrees, the entrance pupil diameter HEP is 0.509 mm, and the maximum image height HOI is 2.061 mm.

[0331] The physical properties of each surface of the wide-angle lens 1000 of this embodiment are shown in Table 11, and the aspheric coefficients of each surface of the wide-angle lens 1000 of this embodiment are shown in Table 12-1 and Table 12-2.

[0332] (Table 11)

[0333]

[0334] In Table 11 above, the units of the radius of curvature, the thickness, the focal distance, and the effective radius are mm, Nd is the refractive index for a light ray of 587.56 nm, νd is the Abbe number, and * indicates an aspheric surface.

[0335] (Table 12-1)

[0336]

[0337] (Table 12-2)

[0338] Surface A8 A10 A12 A14 A16 3 -1.14938E-03 1.63223E-04 -7.82147E-06 0.00000E+00 0.00000E+00 4 5.61909E-02 -1.28652E-02 -3.10366E-04 0.00000E+00 0.00000E+00 5 2.71037E-03 -6.63668E-03 0.00000E+00 0.00000E+00 0.00000E+00 6 -3.16016E-03 -9.85165E-03 2.97746E-03 0.00000E+00 0.00000E+00 7 -1.96461E-02 8.38631E-03 0.00000E+00 0.00000E+00 0.00000E+00 8 -1.03312E-02 1.03923E-02 0.00000E+00 0.00000E+00 0.00000E+00 12 -8.59213E-03 1.81642E-02 -1.67818E-02 5.17215E-03 0.00000E+00 13 5.15225E-02 -2.02257E-02 1.88707E-03 3.30690E-04 0.00000E+00 14 4.12895E-02 -1.76625E-02 3.69776E-03 -2.59955E-04 0.00000E+00

[0339] In Table 12-1 and Table 12-2 above, the radius of curvature is set to a positive value in the case where the lens surface is a convex surface protruding toward the object side or a concave surface recessed toward the object side, and is set to a negative value in the case where the lens surface is a convex surface protruding toward the image side or a concave surface recessed toward the image side.

[0340] Further, in Table 12-1 and Table 12-2 above, the aspheric coefficients A4, A6, A8, A10, A12, A14, and A16 at the time of expressing the aspheric shape of each surface are shown by Mathematical Formula 1 above.

[0341] Here, in the wide-angle lens 1000, the composite focal distance f12 of the first lens 110 and the second lens 120 is -1.310, and the maximum image height HOI is 2.061 mm, and thus the following Condition 1 is satisfied:

[0342] -1.000 < f12 / HOI < -0.400.

[0343] In Condition 1, if f12 / HOI is -1.000 or less, the lens diameter increases, the object-image distance increases, and it is difficult to achieve miniaturization of the entire wide-angle lens, and on the other hand, if f12 / HOI is -0.400 or more, the negative refractive power is too strong, and it is difficult to appropriately correct the field curvature, the lateral chromatic aberration, and the coma.

[0344] On the contrary, in the present embodiment, since the condition 1 is satisfied, the object-image distance can be reduced, so that the entire wide-angle lens can be downsized, and the field curvature, the lateral chromatic aberration, and the coma can be easily and appropriately corrected, so that excellent optical performance can be achieved.

[0345] In particular, in the present embodiment, since the relationship of -0.700 < f12 / HOI < -0.500 is satisfied, the object-image distance can be further reduced, so that the entire wide-angle lens can be downsized, and the field curvature, the lateral chromatic aberration, and the coma can be more easily and appropriately corrected, so that excellent optical performance can be achieved.

[0346] Further, in the wide-angle lens 1000, the effective radius sd11 of the object side lens surface of the first lens 110 is 6.660 mm, and the maximum image height HOI is 2.061 mm, so that the following condition 2 is satisfied:

[0347] 2.000 < sd11 / HOI < 4.000.

[0348] In the condition 2, if sd11 / HOI is 2.000 or less, the position where the light beam on the optical axis passes and the position where the light beam outside the optical axis passes are close to each other, so that the field curvature is not easily and favorably corrected, and on the other hand, if sd11 / HOI is 4.000 or more, the diameter of the first lens 110 is large, so that the downsizing of the wide-angle lens is not easily achieved.

[0349] On the contrary, in the present embodiment, since the condition 2 is satisfied, the position where the light beam on the optical axis passes and the position where the light beam outside the optical axis pass can be separated from each other, so that the field curvature can be favorably corrected, and the diameter of the first lens can be suppressed, so that the downsizing of the wide-angle lens can be more easily achieved.

[0350] Further, in the wide-angle lens 1000, the object-image distance d is 13.383 mm, and the maximum image height HOI is 2.061 mm, so that the following condition 3 is satisfied:

[0351] 5.000 < d / HOI < 8.000

[0352] In the condition 3, if d / HOI is 5.000 or less, various aberrations are not easily and favorably corrected, and on the other hand, if d / HOI is 8.000 or more, the lens diameter and the object-image distance are large, so that the downsizing of the entire wide-angle lens is not easily achieved.

[0353] On the contrary, in the present embodiment, since the condition 3 is satisfied, various aberrations can be favorably corrected, and the lens diameter and the object-image distance can be reduced, so that the downsizing of the entire wide-angle lens can be achieved.

[0354] In particular, in the present embodiment, since the relationship 6.000 < d / HOI < 7.000 is satisfied, various aberrations can be more favorably corrected, and the lens diameter and the object-image distance can be further reduced, thereby achieving the miniaturization of the entire wide-angle lens.

[0355] Further, in the wide-angle lens 1000, the third lens 130 is a positive lens with a convex surface toward the image side, the fourth lens 140 is a positive lens with a convex surface toward the image side, the fifth lens 150 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, the sixth lens 160 is a negative lens with a concave surface toward the image side, the seventh lens 170 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, and the composite focal distance f1234 of the first lens 110, the second lens 120, the third lens 130, and the fourth lens 140 is 4.528 mm, the composite focal distance f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.546 mm, and thus the following condition 4 is satisfied:

[0356] 0.800 < f1234 / f567 < 8.000.

[0357] In the condition 4, if f1234 / f is 2.500 or less, the power of the front lens group composed of the first lens, the second lens, the third lens, and the fourth lens is too strong, and it is not easy to appropriately correct various aberrations, and on the other hand, if f1234 / f is 8.000 or more, the power of the front lens group composed of the first lens, the second lens, the third lens, and the fourth lens is too weak, and it is not easy to reduce the diameters of the lenses of the front lens group, and it is not easy to achieve the miniaturization of the entire wide-angle lens.

[0358] On the contrary, in the present embodiment, since the condition 4 is satisfied, the advantages of more easily appropriately correcting various aberrations and more easily achieving the miniaturization are obtained.

[0359] Further, in the wide-angle lens 1000, the third lens 130 is a positive lens with a convex surface toward the image side, the fourth lens 140 is a positive lens with a convex surface toward the image side, the fifth lens 150 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, the sixth lens 160 is a negative lens with a concave surface toward the image side, the seventh lens 170 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, and the composite focal distance f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.546 mm, and the focal distance f of the entire lens system is 1.018 mm, and thus the following condition 5 is satisfied:

[0360] 2.800 < f567 / f < 3.850

[0361] In the condition 5, if f567 / f is 2.800 or less, the power of the rear lens group composed of the fifth lens, the sixth lens, and the seventh lens is too strong, and it is not easy to appropriately correct various aberrations, particularly, chromatic aberration, on the other hand, if f567 / f is 3.850 or more, it is not easy to reduce the diameter of each lens and the object-image distance, and it is not easy to achieve the miniaturization of the wide-angle lens as a whole.

[0362] On the contrary, in the present embodiment, since the condition 5 is satisfied, there are advantages that it is easy to appropriately correct various aberrations, particularly, chromatic aberration, and it is easier to achieve the miniaturization.

[0363] Further, in the wide-angle lens 1000, the object-image distance d is 13.383 mm, the focal distance f of the lens system as a whole is 1.018 mm, and therefore, the following condition 6 is satisfied:

[0364] 11.000 < d / f < 15.000

[0365] In the condition 6, if d / f is 11.000 or less, it is not easy to appropriately correct various aberrations, on the other hand, if d / f is 15.000 or more, the length of the lens system as a whole becomes too long.

[0366] On the contrary, in the present embodiment, since the condition 6 is satisfied, it is easy to appropriately correct various aberrations, it is easy to obtain excellent optical characteristics, and it is possible to suppress the lens system from becoming too large while avoiding the length of the lens system as a whole from becoming too long.

[0367] Further, in the wide-angle lens 1000, the focal distance f of the lens system as a whole is 1.018 mm, the half field angle θ is 108 / 180, and the maximum image height HOI is 2.061 mm, and the relationship of fθ < HOI < 2f-tan(θ / 2) is satisfied, and therefore, it is easy to achieve a camera lens which can project the image of the peripheral portion more greatly, and it is possible to suppress the distortion aberration of the peripheral portion.

[0368] As described above, in the present embodiment, by constituting the wide-angle lens 1000 in the above-described manner, as shown in FIG. 17, it is possible to reduce the object-image distance, thereby achieving the miniaturization of the wide-angle lens as a whole, and it is easy to appropriately correct the field curvature, the lateral chromatic aberration, and the coma, thereby making it possible to achieve excellent optical characteristics. FIG. 22A to FIG. 24L

[0369] (Embodiment 7)

[0370] FIG. 25 is a view showing a wide-angle lens of Embodiment 7 of the present application, FIG. 26A is a view showing the field curvature and the distortion of the wide-angle lens of Embodiment 7 of the present application, FIG. 26B ​Fig. 28J is a graph showing the field curvature of the wide-angle lens according to Embodiment 7 of the present application, FIG. 27A Fig. 28K is a graph showing the distortion of the wide-angle lens according to Embodiment 7 of the present application, FIG. 27B Fig. 28L is a graph showing the lateral aberration of the wide-angle lens according to Embodiment 7 of the present application. Here, in Fig. 26A, FIG. 28A FIG. 26B FIG. 27A FIG. 27B FIG. 28A to FIG. 28L In Figs. 28J to 28L, the relevant curve for red light R (wavelength: 656 nm) is labeled R, the relevant curve for green light G (wavelength: 588 nm) is labeled G, the relevant curve for blue light B (wavelength: 486 nm) is labeled B, T indicates the tangential direction, S indicates the sagittal direction, and the maximum scale of the vertical axis is ±50.000 μm. FIG. 28A to FIG. 28L

[0371] As shown in Fig. 29, the wide-angle lens 1000 includes, in order from the object side (L1 side), a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, an aperture 180, a fifth lens 150, a sixth lens 160, and a seventh lens 170, wherein the sixth lens 160 and the seventh lens 170 are bonded together by an adhesive to constitute a bonded lens. FIG. 25 Here, since the basic structure of the wide-angle lens 1000 in the present embodiment (i.e., whether the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, and the seventh lens 170 have positive or negative refractive power, are glass or plastic lenses, whether the object-side surface and the image-side surface are convex or concave, and whether they are spherical or aspherical) is the same as that of the wide-angle lens in Embodiment 1, detailed explanation is not given here.

[0372] Further, as shown in Fig. 29, like Embodiment 1, a light-shielding plate 190 is provided between the second lens 120 and the fourth lens 130, a filter 200 is disposed on the image side of the seventh lens 170, and an image pickup element 300 is disposed on the image side of the filter 200.

[0373] FIG. 25

[0374] ​​​​​​​In the present embodiment, the effective focal length f of the entire lens system is 1.019 mm, the total track d is 13.381 mm, the image space F / # is 2.0163, the maximum field of angle is 108 degrees, the entrance pupil diameter HEP is 0.505 mm, and the maximum image height HOI is 2.061 mm.

[0375] The physical properties of each surface of the wide-angle lens 1000 of the present embodiment are shown in Table 13, and the aspheric coefficients of each surface of the wide-angle lens 1000 of the present embodiment are shown in Table 14-1 and Table 14-2.

[0376] (Table 13)

[0377]

[0378] In Table 11 above, the units of the radius of curvature, the thickness, the focal length, and the effective radius are mm, Nd is the refractive index for a light ray of 587.56 nm, νd is the Abbe number, and * indicates an aspheric surface.

[0379] (Table 14-1)

[0380]

[0381] (Table 14-2)

[0382] Surface A8 A10 A12 A14 A16 3 -1.15296E-03 1.63212E-04 -7.75247E-06 0.00000E+00 0.00000E+00 4 5.61909E-02 -1.28652E-02 -3.10366E-04 0.00000E+00 0.00000E+00 5 3.12004E-03 -6.74245E-03 0.00000E+00 0.00000E+00 0.00000E+00 6 -3.16016E-03 -9.85165E-03 2.97746E-03 0.00000E+00 0.00000E+00 7 -1.96461E-02 8.38631E-03 0.00000E+00 0.00000E+00 0.00000E+00 8 -1.03312E-02 1.03923E-02 0.00000E+00 0.00000E+00 0.00000E+00 12 -8.59213E-03 1.81642E-02 -1.67818E-02 5.17215E-03 0.00000E+00 13 5.15225E-02 -2.02257E-02 1.88707E-03 3.30690E-04 0.00000E+00 14 4.13120E-02 -1.76585E-02 3.69817E-03 -2.61279E-04 0.00000E+00

[0383] In Table 14-1 and Table 14-2 above, the radius of curvature is set to a positive value in the case where the lens surface is a convex surface protruding toward the object side or a concave surface recessed toward the object side, and the radius of curvature is set to a negative value in the case where the lens surface is a convex surface protruding toward the image side or a concave surface recessed toward the image side.

[0384] Further, in Table 14-1 and Table 14-2 above, the aspheric coefficients A4, A6, A8, A10, A12, A14, and A16 at the time of expressing the aspheric shape of each surface are shown by Mathematical Formula 1 above.

[0385] Here, in the wide-angle lens 1000, the combined focal length f12 of the first lens 110 and the second lens 120 is -1.310, and the maximum image height HOI is 2.061 mm, and thus, the following Condition 1 is satisfied:

[0386] -1.000 < f12 / HOI < -0.400.

[0387] In the condition 1, if f12 / HOI is -1.000 or less, the lens diameter increases and the object-image distance increases, and it is difficult to realize the miniaturization of the entire wide-angle lens, on the other hand, if f12 / HOI is -0.400 or more, the negative refractive power is too strong, and it is difficult to appropriately correct the field curvature, the lateral chromatic aberration, and the coma.

[0388] On the contrary, in the present embodiment, since the condition 1 is satisfied, the object-image distance can be reduced, and thus the miniaturization of the entire wide-angle lens can be realized, and the field curvature, the lateral chromatic aberration, and the coma can be appropriately corrected, and thus excellent optical characteristics can be realized.

[0389] In particular, in the present embodiment, since the relation of -0.700 < f12 / HOI < -0.500 is satisfied, the object-image distance can be further reduced, and thus the miniaturization of the entire wide-angle lens can be realized, and the field curvature, the lateral chromatic aberration, and the coma can be more appropriately corrected, and thus excellent optical characteristics can be realized.

[0390] Further, in the wide-angle lens 1000, the effective radius sd11 of the object side lens surface of the first lens 110 is 6.660 mm, and the maximum image height HOI is 2.061 mm, and thus the following condition 2 is satisfied:

[0391] 2.000 < sd11 / HOI < 4.000.

[0392] In the condition 2, if sd11 / HOI is 2.000 or less, the position on the optical axis through which the light beam passes and the position outside the optical axis through which the light beam passes are close to each other, and it is difficult to appropriately correct the field curvature, on the other hand, if sd11 / HOI is 4.000 or more, the diameter of the first lens 110 is large, and it is difficult to realize the miniaturization of the wide-angle lens.

[0393] On the contrary, in the present embodiment, since the condition 2 is satisfied, the position on the optical axis through which the light beam passes and the position outside the optical axis through which the light beam passes can be separated, and thus the field curvature can be appropriately corrected, and the diameter of the first lens can be suppressed, and thus the miniaturization of the wide-angle lens can be more easily realized.

[0394] Further, in the wide-angle lens 1000, the object-image distance d is 13.381 mm, and the maximum image height HOI is 2.061 mm, and thus the following condition 3 is satisfied:

[0395] 5.000 < d / HOI < 8.000

[0396] In the condition 3, if d / HOI is 5.000 or less, it is not easy to correct various aberrations well, and on the other hand, if d / HOI is 8.000 or more, the lens diameter and the object-image distance are large, and it is not easy to realize the miniaturization of the entire wide-angle lens.

[0397] On the contrary, in the present embodiment, since the condition 3 is satisfied, various aberrations can be corrected well, and the lens diameter and the object-image distance can be reduced, thereby realizing the miniaturization of the entire wide-angle lens.

[0398] In particular, in the present embodiment, since the relationship of 6.000 < d / HOI < 7.000 is satisfied, various aberrations can be corrected more well, and the lens diameter and the object-image distance can be further reduced, thereby realizing the miniaturization of the entire wide-angle lens.

[0399] Further, in the wide-angle lens 1000, the third lens 130 is a positive lens with a convex surface toward the image side, the fourth lens 140 is a positive lens with a convex surface toward the image side, the fifth lens 150 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, the sixth lens 160 is a negative lens with a concave surface toward the image side, the seventh lens 170 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, and the composite focal distance f1234 of the first lens 110, the second lens 120, the third lens 130, and the fourth lens 140 is 4.815 mm, and the composite focal distance f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.557 mm, and thus the following condition 4 is satisfied:

[0400] 0.800 < f1234 / f567 < 8.000.

[0401] In the condition 4, if f1234 / f is 2.500 or less, the power of the front lens group constituted by the first lens, the second lens, the third lens, and the fourth lens is too strong, and it is not easy to correct various aberrations appropriately, and on the other hand, if f1234 / f is 8.000 or more, the power of the front lens group constituted by the first lens, the second lens, the third lens, and the fourth lens is too weak, and it is not easy to reduce the diameter of each lens of the front lens group, and it is not easy to realize the miniaturization of the entire wide-angle lens.

[0402] On the contrary, in the present embodiment, since the condition 4 is satisfied, there are advantages that it is easier to correct various aberrations appropriately and it is easier to realize the miniaturization.

[0403] Further, in the wide-angle lens 1000, the third lens 130 is a positive lens with a convex surface toward the image side, the fourth lens 140 is a positive lens with a convex surface toward the image side, the fifth lens 150 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, the sixth lens 160 is a negative lens with a concave surface toward the image side, the seventh lens 170 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, and the composite focal length f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.557 mm, and the focal length f of the entire lens system is 1.019 mm, and thus the following condition 5 is satisfied:

[0404] 2.800 < f567 / f < 3.850

[0405] In the condition 5, if f567 / f is 2.800 or less, the power of the rear lens group composed of the fifth lens, the sixth lens, and the seventh lens is too strong, and it is not easy to appropriately correct various aberrations, particularly chromatic aberration, and on the other hand, if f567 / f is 3.850 or more, it is not easy to reduce the diameters of the lenses and the object-image distance, and it is not easy to achieve the miniaturization of the entire wide-angle lens.

[0406] On the contrary, in the present embodiment, since the condition 5 is satisfied, it has the advantages that it is easy to appropriately correct various aberrations, particularly chromatic aberration, and it is easier to achieve miniaturization.

[0407] Further, in the wide-angle lens 1000, the object-image distance d is 13.381 mm, and the focal length f of the entire lens system is 1.019 mm, and thus the following condition 6 is satisfied:

[0408] 11.000 < d / f < 15.000

[0409] In the condition 6, if d / f is 11.000 or less, it is not easy to appropriately correct various aberrations, and on the other hand, if d / f is 15.000 or more, the length of the entire lens system becomes too long.

[0410] On the contrary, in the present embodiment, since the condition 6 is satisfied, it is easy to appropriately correct various aberrations, it is easy to obtain excellent optical characteristics, and it is possible to suppress the lens system from becoming too large while avoiding the length of the entire lens system from becoming too long.

[0411] Further, in the wide-angle lens 1000, the focal length f of the entire lens system is 1.019 mm, the half field angle θ is 108 / 180, and the maximum image height HOI is 2.061 mm, and the relationship fθ < HOI < 2f tan(θ / 2) is satisfied, and thus it is easy to achieve a camera lens that can project an image of the peripheral portion to a larger extent, and it is possible to suppress the distortion aberration of the peripheral portion.

[0412] As described above, in the present embodiment, the wide-angle lens 1000 is configured in the above-described manner, as shown in FIG. 30A, the distance between the object images can be reduced, thereby achieving a reduction in the size of the wide-angle lens as a whole, and the field curvature, the lateral chromatic aberration, the lateral chromatic aberration, and the coma can be easily and appropriately corrected, thereby achieving excellent optical characteristics. FIG. 26A to FIG. 28L

[0413] (Embodiment 8)

[0414] FIG. 29 FIG. 32A is a diagram showing the field curvature of the wide-angle lens according to Embodiment 8 of the present application, FIG. 30A FIG. 32B is a diagram showing the distortion of the wide-angle lens according to Embodiment 8 of the present application, FIG. 30B FIG. 32C is a diagram showing the field curvature of the wide-angle lens according to Embodiment 8 of the present application, FIG. 31A FIG. 32D is a diagram showing the lateral chromatic aberration (transverse chromatic aberration) of the wide-angle lens according to Embodiment 8 of the present application, FIG. 31B FIG. 32E is a diagram showing the spherical aberration (longitudinal chromatic aberration) of the wide-angle lens according to Embodiment 8 of the present application, FIG. 32A FIGS. 32F to 32L are diagrams showing the lateral chromatic aberration of the wide-angle lens according to Embodiment 8 of the present application. In FIGS. 32F to 32L, the relevant curve for red light R (having a wavelength of 656 nm) is labeled R, the relevant curve for green light G (having a wavelength of 588 nm) is labeled G, the relevant curve for blue light B (having a wavelength of 486 nm) is labeled B, T indicates the meridional plane, S indicates the sagittal plane, and, in FIGS. 32F to 32L, the maximum scale of the vertical axis is ±50.000 μm. FIG. 30B FIG. 31A FIG. 31B FIG. 32A to FIG. 32L FIG. 24A to FIG. 24L As shown in FIG. 30A, the wide-angle lens 1000 includes, in order from the object side (L1 side), a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, an aperture 180, a fifth lens 150, a sixth lens 160, and a seventh lens 170, in which the sixth lens 160 and the seventh lens 170 are bonded together by an adhesive to constitute a cemented lens.

[0415] FIG. 29

[0416] ​​​​​​​Here, since the basic structure of the wide-angle lens 1000 in this embodiment (i.e., whether the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, and the seventh lens 170 have positive or negative refractive power, are glass lenses or plastic lenses, whether the object-side surface and the image-side surface are convex or concave, and whether they are spherical or aspherical) is the same as that of the wide-angle lens in Embodiment 1, detailed explanation is not given here.

[0417] Further, as FIG. 29 shown, like Embodiment 1, a light-shielding plate 190 is provided between the second lens 120 and the fourth lens 130, a filter 200 is disposed on the image side of the seventh lens 170, and a camera element 300 is disposed on the image side of the filter 200.

[0418] In this embodiment, the effective focal length f of the entire lens system is 1.030 mm, the total track d is 13.609 mm, the image space F / # is 2, the maximum field of angle is 106 degrees, the entrance pupil diameter HEP is 0.515 mm, and the maximum image height HOI is 2.135 mm.

[0419] The physical properties of each surface of the wide-angle lens 1000 of this embodiment are shown in Table 15, and the aspherical coefficients of each surface of the wide-angle lens 1000 of this embodiment are shown in Table 16-1 and Table 16-2.

[0420] (Table 15)

[0421]

[0422] In Table 15 above, the units of the radius of curvature, the thickness, the effective focal length, and the effective radius are mm, Nd is the refractive index for a light ray of 587.56 nm, νd is the Abbe number, and * indicates that it is aspherical.

[0423] (Table 16-1)

[0424] Surface c(1 / radius of curvature) K A4 A6 3 -4.38390E-02 0.00000E+00 1.02948E-02 -1.01140E-03 4 7.88668E-01 -1.13571E+00 5.66499E-02 1.84231E-03 5 2.82343E-01 0.00000E+00 -2.18543E-02 5.16357E-03 6 1.17050E-01 0.00000E+00 -6.48711E-02 -8.41810E-03 7 2.24418E-01 0.00000E+00 3.04785E-02 1.99197E-02 8 -1.03429E-01 0.00000E+00 9.05286E-02 3.48783E-02 12 -1.83670E-01 0.00000E+00 -3.32106E-02 4.95833E-02 13 9.17180E-01 -3.67711E+00 1.58393E-01 -3.03404E-02 14 -5.07238E-01 -6.42125E-01 3.25791E-02 -8.99922E-03

[0425] (Table 16-2)

[0426] Surface A8 A10 A12 A14 A16 3 2.82136E-05 8.57444E-16 0.00000E+00 0.00000E+00 0.00000E+00 4 3.99185E-02 -2.56858E-02 9.68214E-03 0.00000E+00 0.00000E+00 5 -3.88312E-04 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 6 3.26148E-03 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 7 -6.50576E-03 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 8 4.33217E-03 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 12 -4.63097E-02 2.53604E-02 -5.68334E-03 0.00000E+00 0.00000E+00 13 -2.77646E-02 2.45247E-02 -5.43979E-03 0.00000E+00 0.00000E+00 14 4.06471E-03 -7.04269E-04 4.21913E-05 0.00000E+00 0.00000E+00

[0427] In Tables 16-1 and 16-2 above, the curvature radius is set to a positive value in the case where the lens surface is a convex surface protruding toward the object side or a concave surface recessed toward the object side, and is set to a negative value in the case where the lens surface is a convex surface protruding toward the image side or a concave surface recessed toward the image side.

[0428] Further, in Tables 16-1 and 16-2 above, the aspherical coefficients A4, A6, A8, A10, A12, A14, and A16 at the time of expressing the aspherical shape of each surface by the above Mathematical Formula 1 are shown.

[0429] Here, in the wide-angle lens 1000, the combined focal distance f12 of the first lens 110 and the second lens 120 is -1.262, and the maximum image height HOI is 2.135 mm, and thus the following Condition 1 is satisfied:

[0430] -1.000 < f12 / HOI < -0.400.

[0431] In Condition 1, if f12 / HOI is -1.000 or less, the lens diameter increases, the object-image distance increases, and it is difficult to achieve the miniaturization of the entire wide-angle lens. On the other hand, if f12 / HOI is -0.400 or more, the negative refractive power is too strong, and it is difficult to appropriately correct the field curvature, the lateral chromatic aberration, and the coma.

[0432] In contrast to this, in the present embodiment, since Condition 1 is satisfied, the object-image distance can be reduced, and thus the miniaturization of the entire wide-angle lens can be achieved, and the field curvature, the lateral chromatic aberration, and the coma can be appropriately corrected, and thus excellent optical characteristics can be achieved.

[0433] In particular, in the present embodiment, since the relationship -0.700 < f12 / HOI < -0.500 is satisfied, the object-image distance can be further reduced, and thus the miniaturization of the entire wide-angle lens can be achieved, and the field curvature, the lateral chromatic aberration, and the coma can be more easily appropriately corrected, and thus excellent optical characteristics can be achieved.

[0434] Further, in the wide-angle lens 1000, the effective radius sd11 of the object side lens surface of the first lens 110 is 6.461 mm, and the maximum image height HOI is 2.135 mm, and thus the following Condition 2 is satisfied:

[0435] 2.000 < sd11 / HOI < 4.000.

[0436] In the condition 2, if sdll / HOI is 2.000 or less, the position of the light beam passing on the optical axis and the position of the light beam passing outside the optical axis are close to each other, and it is difficult to correct the field curvature well. On the other hand, if sdll / HOI is 4.000 or more, the diameter of the first lens 110 is large, and it is difficult to realize the miniaturization of the wide-angle lens.

[0437] On the contrary, in the present embodiment, since the condition 2 is satisfied, the position of the light beam passing on the optical axis and the position of the light beam passing outside the optical axis can be separated, and thus the field curvature can be corrected well, and the diameter of the first lens can be suppressed, and thus the miniaturization of the wide-angle lens can be more easily realized.

[0438] Further, in the wide-angle lens 1000, the object-image distance d is 13.609 mm, and the maximum image height HOI is 2.135 mm, and thus the following condition 3 is satisfied:

[0439] 5.000 < d / HOI < 8.000

[0440] In the condition 3, if d / HOI is 5.000 or less, it is difficult to correct various aberrations well. On the other hand, if d / HOI is 8.000 or more, the lens diameter and the object-image distance are large, and it is difficult to realize the miniaturization of the entire wide-angle lens.

[0441] On the contrary, in the present embodiment, since the condition 3 is satisfied, various aberrations can be corrected well, and the lens diameter and the object-image distance can be reduced, and thus the miniaturization of the entire wide-angle lens can be realized.

[0442] In particular, in the present embodiment, since the relationship of 6.000 < d / HOI < 7.000 is satisfied, various aberrations can be more well corrected, and the lens diameter and the object-image distance can be further reduced, and thus the miniaturization of the entire wide-angle lens can be realized.

[0443] Further, in the wide-angle lens 1000, the third lens 130 is a positive lens with a convex surface toward the image side, the fourth lens 140 is a positive lens with a convex surface toward the image side, the fifth lens 150 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, the sixth lens 160 is a negative lens with a concave surface toward the image side, the seventh lens 170 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, and the composite focal distance f1234 of the first lens 110, the second lens 120, the third lens 130, and the fourth lens 140 is 21.864 mm, and the composite focal distance f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.125 mm, and thus the following condition 4 is satisfied:

[0444] 0.800 < f1234 / f567 < 8.000.

[0445] In condition 4, if f1234 / f is 2.500 or less, the power of the front lens group composed of the first lens, the second lens, the third lens, and the fourth lens is too strong, and it is not easy to appropriately correct various aberrations. On the other hand, if f1234 / f is 8.000 or more, the power of the front lens group composed of the first lens, the second lens, the third lens, and the fourth lens is too weak, and it is not easy to reduce the diameter of each lens of the front lens group, and it is not easy to achieve the miniaturization of the wide-angle lens as a whole.

[0446] On the contrary, in the present embodiment, since condition 4 is satisfied, there are advantages that it is easier to appropriately correct various aberrations and easier to achieve the miniaturization.

[0447] Further, in the wide-angle lens 1000, the third lens 130 is a positive lens with a convex surface toward the image side, the fourth lens 140 is a positive lens with a convex surface toward the image side, the fifth lens 150 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, the sixth lens 160 is a negative lens with a concave surface toward the image side, the seventh lens 170 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, and the composite focal distance f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.125 mm, and the focal distance f of the lens system as a whole is 1.030 mm, and therefore, the following condition 5 is satisfied:

[0448] 2.800 < f567 / f < 3.850

[0449] In condition 5, if f567 / f is 2.800 or less, the power of the rear lens group composed of the fifth lens, the sixth lens, and the seventh lens is too strong, and it is not easy to appropriately correct various aberrations, particularly chromatic aberration. On the other hand, if f567 / f is 3.850 or more, it is not easy to reduce the diameter of each lens and the object-image distance, and it is not easy to achieve the miniaturization of the wide-angle lens as a whole.

[0450] On the contrary, in the present embodiment, since condition 5 is satisfied, there are advantages that it is easier to appropriately correct various aberrations, particularly chromatic aberration, and easier to achieve the miniaturization.

[0451] Further, in the wide-angle lens 1000, the object-image distance d is 13.609 mm, and the focal distance f of the lens system as a whole is 1.030 mm, and therefore, the following condition 6 is satisfied:

[0452] 11.000 < d / f < 15.000

[0453] In condition 6, if d / f is 11.000 or less, it is difficult to appropriately correct various aberrations, and on the other hand, if d / f is 15.000 or more, the length of the entire lens system becomes excessively long.

[0454] On the contrary, in the present embodiment, since condition 6 is satisfied, it is easy to appropriately correct various aberrations, it is easy to obtain excellent optical characteristics, and it is possible to suppress the lens system from becoming excessively large while avoiding the length of the entire lens system from becoming excessively long.

[0455] Further, in the wide-angle lens 1000, the focal distance f of the entire lens system is 1.030 mm, the half field angle θ is 106 / 180, and the maximum image height HOI is 2.135 mm, and the relationship of fθ < HOI < 2f tan(θ / 2) is satisfied, and therefore, it is easy to realize an imaging lens which can project an image of the peripheral portion to a larger extent, and it is possible to suppress the distortion aberration of the peripheral portion.

[0456] As described above, in the present embodiment, by constituting the wide-angle lens 1000 in the above-described manner, as shown in FIG. 34A, it is possible to reduce the object image distance, thereby realizing the miniaturization of the entire wide-angle lens, and it is easy to appropriately correct the field curvature, the lateral chromatic aberration, and the coma, and thereby it is possible to realize excellent optical characteristics. FIG. 30A to FIG. 32L

[0457] (Embodiment 9)

[0458] FIG. 33 FIG. 34A is a diagram showing a wide-angle lens of Embodiment 9 of the present application, FIG. 34A FIG. 34B is a diagram showing the field curvature and the distortion of the wide-angle lens of Embodiment 9 of the present application, FIG. 34B FIG. 34C is a diagram showing the field curvature and the distortion of the wide-angle lens of Embodiment 9 of the present application, FIG. 35A FIG. 34D is a diagram showing the sagittal chromatic aberration (lateral chromatic aberration) of the wide-angle lens of Embodiment 9 of the present application, FIG. 35B FIG. 34E is a diagram showing the spherical aberration (longitudinal chromatic aberration) of the wide-angle lens of Embodiment 9 of the present application, FIG. 36A FIGS. 34F to 34L are diagrams showing the lateral chromatic aberration of the wide-angle lens of Embodiment 9 of the present application. In FIGS. 34A to 34L, FIG. 34B , FIG. 35A , FIG. 35B , FIG. 36A to FIG. 36L In FIGS. 34A to 34L, the relevant curve of red light R (wavelength: 656 nm) is denoted by R, the relevant curve of green light G (wavelength: 588 nm) is denoted by G, the relevant curve of blue light B (wavelength: 486 nm) is denoted by B, T indicates the meridional plane, S indicates the sagittal plane, and in FIG. 28A to FIG. 28L ​In the figure, the maximum scale of the vertical axis is ±50.000 μm.

[0459] like FIG. 33 As shown, the wide-angle lens 1000 includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, an aperture 180, a fifth lens 150, a sixth lens 160, and a seventh lens 170 arranged sequentially from the object side (L1 side). The sixth lens 160 and the seventh lens 170 are bonded together with an adhesive to form a joint lens.

[0460] Since the basic structure of the wide-angle lens 1000 in this embodiment (i.e., whether the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, and the seventh lens 170 have positive or negative optical power, whether they are glass lenses or plastic lenses, whether the object-side surface and the image-side surface are convex or concave, and whether they are spherical or aspherical) is the same as that of the wide-angle lens in Embodiment 1, it will not be elaborated on here.

[0461] In addition, such as FIG. 33 As shown, similar to Embodiment 1, a light-shielding sheet 190 is provided between the second lens 120 and the fourth lens 130, a filter 200 is provided on the image side of the seventh lens 170, and an image sensor 300 is provided on the image side of the filter 200.

[0462] In this embodiment, the overall focal length f (Effective Focal Length) of the lens system is 1.019 mm, the object-to-image distance d (Total Track) is 13.397 mm, the image space F / # is 2.012, the maximum field of view is 108.004 degrees, the entrance pupil diameter HEP is 0.506 mm, and the maximum image height HOI is 2.059 mm.

[0463] Table 17 shows the physical properties of each facet of the wide-angle lens 1000 of this embodiment, and Tables 18-1 and 18-2 show the aspherical coefficients of each facet of the wide-angle lens 1000 of this embodiment.

[0464] (Table 17)

[0465]

[0466] In Table 17 above, the units for radius of curvature, thickness, focal distance, and effective radius are mm, Nd is the refractive index of light at 587.56 nanometers, νd is the Abbe number, and * indicates an aspherical surface.

[0467] (Table 18-1)

[0468]

[0469] (Table 18-2)

[0470] Surface A8 A10 A12 A14 A16 3 -6.11588E-05 1.50045E-05 3.90615E-08 0.00000E+00 0.00000E+00 4 4.96308E-02 -1.37651E-02 1.87863E-04 0.00000E+00 0.00000E+00 5 2.50539E-03 -1.94316E-04 -2.18386E-04 0.00000E+00 0.00000E+00 6 2.37631E-03 4.68175E-04 1.19525E-03 0.00000E+00 0.00000E+00 7 1.14133E-02 6.53638E-04 0.00000E+00 0.00000E+00 0.00000E+00 8 1.36753E-02 -1.98505E-03 0.00000E+00 0.00000E+00 0.00000E+00 12 3.38366E-03 -2.00010E-03 6.86525E-04 0.00000E+00 0.00000E+00 13 2.79270E-02 -5.22149E-03 -1.20343E-04 0.00000E+00 0.00000E+00 14 2.26165E-02 -7.19858E-03 9.87041E-04 0.00000E+00 0.00000E+00

[0471] In Tables 18-1 and 18-2 above, the curvature radius is set to a positive value in the case where the lens face is a convex face protruding toward the object side or a concave face recessed toward the object side, and is set to a negative value in the case where the lens face is a convex face protruding toward the image side or a concave face recessed toward the image side.

[0472] Further, in Tables 18-1 and 18-2 above, the aspheric coefficients A4, A6, A8, A10, A12, A14, A16 at the time of expressing the aspheric shape of each face are shown by Mathematical Formula 1 above.

[0473] Here, in the wide-angle lens 1000, the combined focal distance f12 of the first lens 110 and the second lens 120 is -1.415, and the maximum image height HOI is 2.059 mm, and thus the following Condition 1 is satisfied:

[0474] -1.000 < f12 / HOI < -0.400.

[0475] In Condition 1, if f12 / HOI is -1.000 or less, the lens diameter increases, the object-image distance increases, and it is difficult to achieve miniaturization of the entire wide-angle lens, and on the other hand, if f12 / HOI is -0.400 or more, the negative refractive power is too strong, and it is difficult to appropriately correct the field curvature, the lateral chromatic aberration, and the coma.

[0476] In contrast to this, in the present embodiment, since Condition 1 is satisfied, the object-image distance can be reduced, and thus miniaturization of the entire wide-angle lens can be achieved, and the field curvature, the lateral chromatic aberration, and the coma can be appropriately corrected, and thus excellent optical characteristics can be achieved.

[0477] In particular, in the present embodiment, since the relationship -0.700 < f12 / HOI < -0.500 is satisfied, the object-image distance can be further reduced, and thus miniaturization of the entire wide-angle lens can be achieved, and the field curvature, the lateral chromatic aberration, and the coma can be more easily appropriately corrected, and thus excellent optical characteristics can be achieved.

[0478] Further, in the wide-angle lens 1000, the effective radius sd11 of the object side lens face of the first lens 110 is 6.600 mm, and the maximum image height HOI is 2.059 mm, and thus the following Condition 2 is satisfied:

[0479] 2.000 < sdll / HOI < 4.000.

[0480] In condition 2, if sdll / HOI is 2.000 or less, the position where the light beam on the optical axis passes and the position where the light beam outside the optical axis passes are close to each other, and it is difficult to correct the field curvature well. On the other hand, if sdll / HOI is 4.000 or more, the diameter of the first lens 110 is large, and it is difficult to realize the miniaturization of the wide-angle lens.

[0481] In contrast, in the present embodiment, since condition 2 is satisfied, the position where the light beam on the optical axis passes and the position where the light beam outside the optical axis pass are separated from each other, and it is possible to correct the field curvature well, and it is possible to suppress the diameter of the first lens, and thus it is easier to realize the miniaturization of the wide-angle lens.

[0482] Further, in the wide-angle lens 1000, the object-image distance d is 13.397 mm, and the maximum image height HOI is 2.059 mm, and thus condition 3 below is satisfied:

[0483] 5.000 < d / HOI < 8.000

[0484] In condition 3, if d / HOI is 5.000 or less, it is difficult to correct various aberrations well. On the other hand, if d / HOI is 8.000 or more, the lens diameter and the object-image distance are large, and it is difficult to realize the miniaturization of the entire wide-angle lens.

[0485] In contrast, in the present embodiment, since condition 3 is satisfied, it is possible to correct various aberrations well, and it is possible to reduce the lens diameter and the object-image distance, and thus it is possible to realize the miniaturization of the entire wide-angle lens.

[0486] In particular, in the present embodiment, since the relationship 6.000 < d / HOI < 7.000 is satisfied, it is possible to correct various aberrations more well, and it is possible to further reduce the lens diameter and the object-image distance, and thus it is possible to realize the miniaturization of the entire wide-angle lens.

[0487] Further, in the wide-angle lens 1000, the third lens 130 is a positive lens with a convex surface toward the image side, the fourth lens 140 is a positive lens with a convex surface toward the image side, the fifth lens 150 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, the sixth lens 160 is a negative lens with a concave surface toward the image side, the seventh lens 170 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, and the composite focal length f1234 of the first lens 110, the second lens 120, the third lens 130, and the fourth lens 140 is 26.363 mm, the composite focal length f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.374 mm, and thus the following condition 4 is satisfied:

[0488] 0.800 < f1234 / f567 < 8.000.

[0489] In the condition 4, if f1234 / f is 2.500 or less, the power of the front lens group composed of the first lens, the second lens, the third lens, and the fourth lens is too strong, and it is not easy to appropriately correct various aberrations. On the other hand, if f1234 / f is 8.000 or more, the power of the front lens group composed of the first lens, the second lens, the third lens, and the fourth lens is too weak, and it is not easy to reduce the diameters of the lenses of the front lens group and to achieve the miniaturization of the entire wide-angle lens.

[0490] On the contrary, in the present embodiment, since the condition 4 is satisfied, it has the advantages that it is easier to appropriately correct various aberrations and to achieve the miniaturization.

[0491] Further, in the wide-angle lens 1000, the third lens 130 is a positive lens with a convex surface toward the image side, the fourth lens 140 is a positive lens with a convex surface toward the image side, the fifth lens 150 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, the sixth lens 160 is a negative lens with a concave surface toward the image side, the seventh lens 170 is a positive lens with a convex surface toward the object side and a convex surface toward the image side, and the composite focal length f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.374 mm, the focal length f of the entire lens system is 1.019 mm, and thus the following condition 5 is satisfied:

[0492] 2.800 < f567 / f < 3.850

[0493] In the condition 5, if f567 / f is 2.800 or less, the power of the rear lens group composed of the fifth lens, the sixth lens, and the seventh lens is too strong, and it is not easy to appropriately correct various aberrations, particularly, chromatic aberration. On the other hand, if f567 / f is 3.850 or more, it is not easy to reduce the diameters of the lenses and the object-image distance, and it is not easy to achieve the miniaturization of the entire wide-angle lens.

[0494] In contrast, in this embodiment, since condition 5 is satisfied, it has the advantages of being able to easily correct various aberrations, especially chromatic aberrations, and being easier to miniaturize.

[0495] Furthermore, in the wide-angle lens 1000, the object-image distance d is 13.397 mm, and the overall focal distance f of the lens system is 1.019 mm. Therefore, the following condition 6 is satisfied:

[0496] 11.000 < d / f < 15.000

[0497] In condition 6, if d / f is below 11.000, it is not easy to properly correct various aberrations. On the other hand, if d / f is above 15.000, the overall length of the lens system becomes too long.

[0498] In contrast, in this embodiment, since condition 6 is satisfied, it is easy to properly correct various aberrations, easily obtain excellent optical characteristics, and suppress the lens system from becoming too large while avoiding the overall length of the lens system becoming too long.

[0499] Furthermore, in the wide-angle lens 1000, the overall focal distance f of the lens system is 1.019 mm, the half field of view θ is 108.004 / 180, and the maximum image height HOI is 2.059 mm, which satisfies the relationship fθ<HOI< 2f·tan(θ / 2). Therefore, it is easy to realize a camera lens that can project a larger image of the peripheral area and suppress the distortion aberration of the peripheral area.

[0500] In summary, in this embodiment, by constructing the wide-angle lens 1000 in the manner described above, as follows... FIG. 34A to FIG. 36L As shown, it can reduce the distance between the object and the image, thereby achieving the miniaturization of the wide-angle lens as a whole, and can easily and appropriately correct field curvature, chromatic aberration, and coma aberration, thus achieving excellent optical characteristics.

[0501] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above embodiments.

[0502] For example, in the above embodiments, the shape of the first surface 1 of the first lens 110, the shape of the third surface 3 of the second lens 120, the shape of the fifth surface 5 of the third lens 130, the shape of the seventh surface 7 of the fourth lens 140, and the shape of the twelfth surface 12 of the sixth lens 160 can be appropriately changed as needed.

[0503] Further, in the above-described embodiments, the first lens 110 and the fifth lens 150 can also be composed of plastic lenses, and the second lens 120, the third lens 130, the fourth lens 140, the sixth lens 160, and the seventh lens 170 can also be composed of glass lenses.

Claims

1. A wide-angle lens, characterized in that, It includes, in sequence from the object side, a first lens, a second lens, a third lens, a fourth lens, an aperture, a fifth lens, a sixth lens, a seventh lens, and an imaging element. The first lens is a negative lens with its convex spherical surface facing the object side and its concave surface facing the image side. The second lens is a negative lens with its concave surface facing the image side. When the combined focal distance between the first lens and the second lens is set to f12 and the maximum image height is set to HOI, the following relationship is satisfied: -1.000 < f12 / HOI < -0.400, The sixth lens and the seventh lens constitute a combined lens. The third lens is a positive lens with its convex surface facing the image side. The fourth lens is a positive lens with its convex surface facing the image side. The fifth lens is a positive lens with its convex surface facing the object side and its convex surface facing the image side. The sixth lens is a negative lens with its concave surface facing the image side. The seventh lens is a positive lens with its convex surface facing the object side and its convex surface facing the image side. When the combined focal distance of the first lens, the second lens, the third lens, and the fourth lens is set to f1234, and the combined focal distance of the fifth lens, the sixth lens, and the seventh lens is set to f567, the following relationship is satisfied: 0.800 < f1234 / f567 < 8.

000.

2. The wide-angle lens as described in claim 1, characterized in that, The following relationship must be satisfied: -0.700 < f12 / HOI < -0.

500.

3. The wide-angle lens as described in claim 1, characterized in that, When the effective radius of the object-side lens surface of the first lens is set to sd11, the following relationship is satisfied: 2.000 < sd11 / HOI < 4.

000.

4. The wide-angle lens as described in claim 3, characterized in that, The following relationship must be satisfied: 2.500 < sd11 / HOI < 3.

500.

5. The wide-angle lens as described in any one of claims 1 to 4, characterized in that, When the distance between the object and the image of a wide-angle lens is set to d, the following relationship is satisfied: 5.000 < d / HOI < 8.

000.

6. The wide-angle lens as described in claim 5, characterized in that, The following relationship must be satisfied: 6.000 < d / HOI < 7.

000.

7. The wide-angle lens as described in claim 1, characterized in that, When the focal distance of the entire wide-angle lens is set to f, the following relationship is satisfied: 2.800 < f567 / f < 3.

850.

8. The wide-angle lens as described in claim 1, characterized in that, When the focal distance of the wide-angle lens is set to f and the half field of view of the wide-angle lens is set to θ, the following relationship is satisfied: fθ<HOI<2f·tan(θ / 2).

9. The wide-angle lens as described in claim 1, characterized in that, The first lens and the fifth lens are both glass lenses. The second lens, the third lens, the fourth lens, the sixth lens, and the seventh lens are all plastic lenses.

10. A wide-angle lens, characterized in that, It includes, in sequence from the object side, a first lens, a second lens, a third lens, a fourth lens, an aperture, a fifth lens, a sixth lens, a seventh lens, and an imaging element. The first lens is a negative lens with its convex spherical surface facing the object side and its concave surface facing the image side. The second lens is a negative lens with its concave surface facing the image side. When the combined focal distance between the first lens and the second lens is set to f12 and the maximum image height is set to HOI, the following relationship is satisfied: -1.000 < f12 / HOI < -0.400, The sixth lens and the seventh lens constitute a combined lens. The third lens is a positive lens with its convex surface facing the image side. The fourth lens is a positive lens with its convex surface facing the image side. The fifth lens is a positive lens with its convex surface facing the object side and its convex surface facing the image side. The sixth lens is a negative lens with its concave surface facing the image side. The seventh lens is a positive lens with its convex surface facing the object side and its convex surface facing the image side. When the combined focal distance of the fifth lens, the sixth lens, and the seventh lens is set to f567, and the focal distance of the entire wide-angle lens is set to f, the following relationship is satisfied: 2.800 < f567 / f < 3.

850.

11. The wide-angle lens as described in claim 10, characterized in that, The following relationship must be satisfied: -0.700 < f12 / HOI < -0.

500.

12. The wide-angle lens as described in claim 10, characterized in that, When the effective radius of the object-side lens surface of the first lens is set to sd11, the following relationship is satisfied: 2.000 < sd11 / HOI < 4.

000.

13. The wide-angle lens as described in claim 12, characterized in that, The following relationship must be satisfied: 2.500 < sd11 / HOI < 3.

500.

14. The wide-angle lens as described in any one of claims 10 to 13, characterized in that, When the distance between the object and the image of a wide-angle lens is set to d, the following relationship is satisfied: 5.000 < d / HOI < 8.

000.

15. The wide-angle lens as described in claim 14, characterized in that, The following relationship must be satisfied: 6.000 < d / HOI < 7.

000.

16. The wide-angle lens as described in claim 10, characterized in that, When the focal distance of the wide-angle lens is set to f and the half field of view of the wide-angle lens is set to θ, the following relationship is satisfied: fθ<HOI<2f·tan(θ / 2).

17. The wide-angle lens as described in claim 10, characterized in that, The first lens and the fifth lens are both glass lenses. The second lens, the third lens, the fourth lens, the sixth lens, and the seventh lens are all plastic lenses.

Images