Wide-angle lens

Abstract

A wide-angle lens that facilitates appropriate correction of various aberrations of the wide-angle lens. The wide-angle lens of the present invention includes, in order from the object side, a first lens, a second lens, a third lens, a fourth lens, an aperture, a fifth lens, a sixth lens, and a seventh lens, the sixth lens and the seventh lens constituting a cemented lens, the image-side lens surface of the fifth lens being a convex surface, and when the curvature radius of the object-side lens surface of the sixth lens is set as R61 and the curvature radius of the image-side lens surface of the sixth lens is set as R62, the following relationship is satisfied: 0 < (R61+R62) / (R61‑R62) < 1.000.

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, and a seventh lens (see, for example, Patent Literature 1).

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

[0004] In practice, in order to ensure imaging performance, it is desirable to easily and appropriately correct various aberrations of a 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 facilitates appropriate correction of various aberrations of a 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, and a seventh lens, the sixth lens and the seventh lens constituting a cemented lens, an image-side lens surface of the fifth lens being a convex surface, and when a curvature radius of an object-side lens surface of the sixth lens is set as R61 and a curvature radius of an image-side lens surface of the sixth lens is set as R62, the following relationship is satisfied: 0 < (R61 + R62) / (R61 - R62) < 1.000.

[0007] According to the wide-angle lens of the present application, the relationship (R61 + R62) / (R61 - R62) > 0 is satisfied, and therefore the sixth lens has a shape in which the curvature radius of the image-side lens surface is smaller than the curvature radius of the object-side lens surface, whereby the coma, the field curvature, the lateral chromatic aberration, and the like of the sixth lens can be favorably corrected; and the relationship (R61 + R62) / (R61 - R62) < 1.000 is satisfied, and therefore the chromatic aberration can be favorably corrected.

[0008] Further, in the wide-angle lens of the present application, it is preferable that the following relationship be satisfied: 0 < (R61 + R62) / (R61 - R62) < 0.750.

[0009] According to the wide-angle lens of the present application, the relationship 0 < (R61 + R62) / (R61 - R62) < 0.750 is satisfied, and therefore the coma, the field curvature, the lateral chromatic aberration, and the like of the sixth lens can be more favorably corrected, and the chromatic aberration can be more favorably corrected.

[0010] Further, in the wide-angle lens of the present application, it is preferable that, when a sagittal height of an image-side lens surface of the fifth lens is Sag52, an effective radius of the image-side lens surface of the fifth lens is sd52, a sagittal height of an object-side lens surface of the sixth lens is Sag61, and an effective radius of the object-side lens surface of the sixth lens is sd61, the following relationship is satisfied: 1.000 < (Sag52 / sd52) / (Sag61 / sd61) < 3.000.

[0011] According to the wide-angle lens of the present application, the relationship (Sag52 / sd52) / (Sag61 / sd61) > 1.000 is satisfied, and therefore the radius of curvature of the image-side lens surface of the fifth lens is larger than the radius of curvature of the object-side lens surface of the sixth lens, so that the fifth lens and the sixth lens are brought close to each other, and the positioning accuracy of the fifth lens or the sixth lens, the interval between the fifth lens and the sixth lens, and the thickness accuracy of the fifth lens and the sixth lens do not become excessively high, and the assembly of the product is easily performed; and the relationship (Sag52 / sd52) / (Sag61 / sd61) < 3.000 is satisfied, and therefore various aberrations can be corrected well.

[0012] Further, in the wide-angle lens of the present application, it is preferable that the following relationship is satisfied: 1.400 < (Sag52 / sd52) / (Sag61 / sd61) < 2.500.

[0013] According to the wide-angle lens of the present application, the relationship 1.400 < (Sag52 / sd52) / (Sag61 / sd61) < 2.500 is satisfied, and therefore the assembly of the product is more easily performed, and various aberrations can be more well corrected.

[0014] Further, in the wide-angle lens of the present application, it is preferable that the sixth lens and the seventh lens are each a plastic lens, and when a thickness at an optical axis of the seventh lens is T7 and a flange thickness of an outer periphery of the seventh lens is C7, the following relationship is satisfied: 2.000 < T7 / C7 < 3.500.

[0015] According to the wide-angle lens of the present application, the relationship T7 / C7 > 2.000 is satisfied, and therefore the convex lens surface of the seventh lens can be greatly projected, and thereby aberrations such as chromatic aberration can be effectively reduced; and the relationship T7 / C7 < 3.500 is satisfied, and therefore, when resin molding of the seventh lens is performed using a mold, the distance in the optical axis direction between a gate provided on the side surface of the flange portion of the seventh lens and the top of the convex lens surface is limited, and thereby the injection pressure at the time of resin molding can be appropriately transmitted to the top of the convex lens surface, and a fine concave portion caused by shrinkage of resin or the like is less likely to be generated at the top of the convex lens surface.

[0016] Further, in the wide-angle lens of the present application, it is preferable that the following relation is satisfied: 2.300 < T7 / C7 < 3.200.

[0017] According to the wide-angle lens of the present application, the relation 2.300 < T7 / C7 < 3.200 is satisfied, and therefore, chromatic aberration and the like can be reduced more effectively, and a fine concave portion caused by shrinkage of resin and the like is less likely to occur at the top of the convex lens surface.

[0018] 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 seventh lens is set as sd71: 1.100 < sd71 / C7 < 1.800.

[0019] According to the wide-angle lens of the present application, the relation sd71 / C7 > 1.100 is satisfied, and therefore, the convex lens surface of the seventh lens can be projected significantly, and thereby, chromatic aberration and the like can be reduced effectively; and the relation sd71 / C7 < 1.800 is satisfied, and therefore, when resin molding of the seventh lens is performed using a mold, the distance in the optical axis direction between the gate provided at the side of the flange portion of the seventh lens and the top of the convex lens surface is limited, and thereby, the injection pressure at the time of resin molding can be appropriately transmitted to the top of the convex lens surface, and a fine concave portion caused by shrinkage of resin and the like is less likely to occur at the top of the convex lens surface.

[0020] Further, in the wide-angle lens of the present application, it is preferable that the following relation is satisfied: 1.200 < sd71 / C7 < 1.600.

[0021] According to the wide-angle lens of the present application, the relation 1.200 < sd71 / C7 < 1.600 is satisfied, and therefore, chromatic aberration and the like can be reduced more effectively, and a fine concave portion caused by shrinkage of resin and the like is less likely to occur at the top of the convex lens surface.

[0022] Further, in the wide-angle lens of the present application, it is preferable that the sixth lens and the seventh lens are bonded together by an adhesive layer, and the following relation is satisfied when the refractive index of the sixth lens is set as n6, the refractive index of the adhesive layer is set as n0, and the refractive index of the seventh lens is set as n7: |n6 - n0| > |n7 - n0|.

[0023] According to the wide-angle lens of the present application, even if a slight concave portion is generated at the top of the convex lens surface of the seventh lens due to shrinkage of the resin or the like when resin molding of the seventh lens is performed using a mold, the adhesive layer can be filled into the above-mentioned concave portion when the joint lens is formed, and the refractive index n0 of the adhesive layer is closer to the refractive index n7 of the seventh lens than to the refractive index n6 of the sixth lens, so the adhesive layer filled into the above-mentioned concave portion can function as a part of the convex lens surface of the seventh lens, whereby the optical characteristics of the wide-angle lens are less likely to be degraded.

[0024] Further, in the wide-angle lens of the present application, it is preferable that, when the combined focal length of the sixth lens and the seventh lens is set to f67 and the focal length of the entire wide-angle lens is set to f, the following relationship is satisfied: 6.000 < f67 / f < 13.500.

[0025] According to the wide-angle lens of the present application, the relationship 6.000 < f67 / f < 13.500 is satisfied, so chromatic aberration can be appropriately corrected.

[0026] Further, in the wide-angle lens of the present application, it is preferable that the following relationship is satisfied: 8.000 < f67 / f < 12.000.

[0027] According to the wide-angle lens of the present application, the relationship 8.000 < f67 / f < 12.000 is satisfied, so chromatic aberration can be more appropriately corrected.

[0028] Further, in the wide-angle lens of the present application, it is preferable that, when the radius of curvature of the object side lens surface of the seventh lens is set to R71 and the focal length of the entire wide-angle lens is set to f, the following relationship is satisfied: 0.800 < R71 / f < 1.200.

[0029] According to the wide-angle lens of the present application, the relationship R71 / f > 0.800 is satisfied, so the radius of curvature of the joint surface of the sixth lens and the seventh lens is not too small, whereby the sixth lens and the seventh lens can be easily formed, and generation of spherical aberration can be suppressed; and the relationship R71 / f < 1.200 is satisfied, so various aberrations (particularly, chromatic aberration) can be appropriately corrected, and thus excellent optical characteristics can be achieved.

[0030] Further, in the wide-angle lens of the present application, it is preferable that, when the object-image distance of the wide-angle lens is set to d and the focal length of the entire wide-angle lens is set to f, the following relationship is satisfied: 11.000 < d / f < 15.000.

[0031] The wide-angle lens according to the present application satisfies the relation d / f > 11.000, and thus, various aberrations are easily properly corrected, and thus, excellent optical characteristics are easily obtained. On the other hand, the wide-angle lens according to the present application satisfies the relation d / f < 15.000, and thus, the lens system is prevented from becoming too large while the length of the entire lens system is prevented from becoming too long.

[0032] Further, in the wide-angle lens according to the present application, it is preferable that the first lens be a negative lens having a concave image-side lens surface, the second lens be a negative lens having a concave image-side lens surface, the third lens be a positive lens having a convex image-side lens surface, the fourth lens be a positive lens having a convex image-side lens surface, the fifth lens be a positive lens having a convex object-side lens surface and a convex image-side lens surface, the sixth lens be a negative lens having a concave image-side lens surface, and the seventh lens be a positive lens having a convex object-side lens surface and a convex image-side lens surface.

[0033] Further, in the wide-angle lens according to the present application, it is preferable that the first lens and the fifth lens each be a glass lens, and the second lens, the third lens, the fourth lens, the sixth lens, and the seventh lens each be a plastic lens.

[0034] (EFFECT OF INVENTION)

[0035] According to the present application, when the radius of curvature of the object-side lens surface of the sixth lens is set to R61 and the radius of curvature of the image-side lens surface of the sixth lens is set to R62, the relation (R61 + R62) / (R61 - R62) > 0 is satisfied, and thus, the sixth lens has a shape in which the radius of curvature of the image-side lens surface is smaller than the radius of curvature of the object-side lens surface, and thus, the coma, the field curvature, the lateral chromatic aberration, and the like of the sixth lens are favorably corrected. Further, the relation (R61 + R62) / (R61 - R62) < 1.000 is satisfied, and thus, the chromatic aberration is favorably corrected. BRIEF DESCRIPTION OF DRAWINGS

[0036] FIG. 1 is a view showing a wide-angle lens according to Embodiment 1 of the present application.

[0037] FIG. 2A is a view showing the field curvature and the distortion of the wide-angle lens according to Embodiment 1 of the present application.

[0038] FIG. 2B is a view showing the field curvature and the distortion of the wide-angle lens according to Embodiment 1 of the present application.

[0039] FIG. 3A is a view showing the sagittal chromatic aberration (lateral chromatic aberration) of the wide-angle lens according to Embodiment 1 of the present application.

[0040] FIG. 3Bis a diagram showing the field curvature and distortion of the wide-angle lens according to Embodiment 1 of the present application.

[0041] FIG. 4A to FIG. 4L is a diagram showing the lateral aberration of the wide-angle lens according to Embodiment 1 of the present application.

[0042] FIG. 5 is a diagram showing the wide-angle lens according to Embodiment 2 of the present application.

[0043] FIG. 6A is a diagram showing the field curvature and distortion of the wide-angle lens according to Embodiment 2 of the present application.

[0044] FIG. 6B is a diagram showing the field curvature and distortion of the wide-angle lens according to Embodiment 2 of the present application.

[0045] FIG. 7A is a diagram showing the lateral aberration of the wide-angle lens according to Embodiment 2 of the present application.

[0046] FIG. 7B is a diagram showing the lateral aberration of the wide-angle lens according to Embodiment 2 of the present application.

[0047] FIG. 8A to FIG. 8L is a diagram showing the lateral aberration of the wide-angle lens according to Embodiment 2 of the present application.

[0048] FIG. 9 is a diagram showing the wide-angle lens according to Embodiment 3 of the present application.

[0049] FIG. 10A is a diagram showing the field curvature and distortion of the wide-angle lens according to Embodiment 3 of the present application.

[0050] FIG. 10B is a diagram showing the field curvature and distortion of the wide-angle lens according to Embodiment 3 of the present application.

[0051] FIG. 11A is a diagram showing the lateral aberration of the wide-angle lens according to Embodiment 3 of the present application.

[0052] FIG. 11B is a diagram showing the lateral aberration of the wide-angle lens according to Embodiment 3 of the present application.

[0053] FIG. 12A to FIG. 12L is a diagram showing the lateral aberration of the wide-angle lens according to Embodiment 2 of the present application.

[0054] FIG. 13 is a diagram showing the wide-angle lens according to Embodiment 4 of the present application.

[0055] FIG. 14Ais a diagram showing field curvature and distortion of the wide-angle lens of Embodiment 4 of the present application.

[0056] FIG. 14B is a diagram showing field curvature and distortion of the wide-angle lens of Embodiment 4 of the present application.

[0057] FIG. 15A is a diagram showing lateral chromatic aberration (transverse chromatic aberration) of the wide-angle lens of Embodiment 4 of the present application.

[0058] FIG. 15B is a diagram showing longitudinal chromatic aberration (longitudinal aberration) of the wide-angle lens of Embodiment 4 of the present application.

[0059] FIG. 16A to FIG. 16L is a diagram showing lateral chromatic aberration (transverse chromatic aberration) of the wide-angle lens of Embodiment 4 of the present application.

[0060] FIG. 17 is a diagram showing lateral chromatic aberration (transverse chromatic aberration) of the wide-angle lens of Embodiment 4 of the present application.

[0061] FIG. 18A is a diagram showing field curvature and distortion of the wide-angle lens of Embodiment 5 of the present application.

[0062] FIG. 18B is a diagram showing field curvature and distortion of the wide-angle lens of Embodiment 5 of the present application.

[0063] FIG. 19A is a diagram showing lateral chromatic aberration (transverse chromatic aberration) of the wide-angle lens of Embodiment 5 of the present application.

[0064] FIG. 19B is a diagram showing longitudinal chromatic aberration (longitudinal aberration) of the wide-angle lens of Embodiment 5 of the present application.

[0065] FIG. 20A to FIG. 20L is a diagram showing lateral chromatic aberration (transverse chromatic aberration) of the wide-angle lens of Embodiment 5 of the present application.

[0066] FIG. 18A is a diagram showing lateral chromatic aberration (transverse chromatic aberration) of the wide-angle lens of Embodiment 5 of the present application.

[0067] FIG. 18B is a diagram showing field curvature and distortion of the wide-angle lens of Embodiment 6 of the present application.

[0068] FIG. 19A is a diagram showing field curvature and distortion of the wide-angle lens of Embodiment 6 of the present application.

[0069] FIG. 19B is a diagram showing lateral chromatic aberration (transverse chromatic aberration) of the wide-angle lens of Embodiment 6 of the present application.

[0070] FIG. 20A to FIG. 20LThis is an explanatory diagram showing the spherical aberration (longitudinal aberration) of the wide-angle lens according to Embodiment 6 of the present invention.

[0071] FIG. 20A to FIG. 20L This is an explanatory diagram showing the lateral aberration of the wide-angle lens according to Embodiment 6 of the present invention.

[0072] (Symbol Explanation)

[0073] 1000 wide-angle lens

[0074] 110 First Lens

[0075] 120 Second Lens

[0076] 130 Third Lens

[0077] 140 Fourth Lens

[0078] 150 Fifth Lens

[0079] 160 Sixth Lens

[0080] 170 Seventh Lens

[0081] 180 aperture

[0082] 190 light-blocking sheet

[0083] 200 filters

[0084] 300 camera elements Detailed Implementation

[0085] Hereinafter, various embodiments of the wide-angle lens of the present invention will be described with reference to the accompanying drawings. Furthermore, in the following description, the object side will be labeled L1 and the image side L2 in the direction of extension of the optical axis L.

[0086] (Implementation Method 1)

[0087] FIG. 17 This is an explanatory diagram showing the wide-angle lens according to Embodiment 1 of the present invention. FIG. 17 This is an explanatory diagram showing the field curvature and distortion of the wide-angle lens according to Embodiment 1 of the present invention. Surface This is an explanatory diagram showing the field curvature and distortion of the wide-angle lens according to Embodiment 1 of the present invention. FIG. 6A to FIG. 8L This is an explanatory diagram showing the transverse chromatic aberration (lateral chromatic aberration) of the wide-angle lens according to Embodiment 1 of the present invention. FIG. 9 This is an explanatory diagram showing the spherical aberration (longitudinal aberration) of the wide-angle lens according to Embodiment 1 of the present invention. FIG. 10A This is an explanatory diagram illustrating the lateral aberration of the wide-angle lens according to Embodiment 1 of the present invention. Here, in FIG. 10B , FIG. 11A , FIG. 11B ,FIG. 12A to FIG. 12L , FIG. 10A 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. 10B In the figure, the maximum scale of the vertical axis is ±50.000 μm.

[0088] like FIG. 11A 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.

[0089] Here, the first lens 110 is a lens with negative optical power (referred to as a negative lens) whose convex surface (first surface 1) faces the object side L1 and whose concave surface (second surface 2) faces the image side L2. In this embodiment, the first lens 110 is a glass lens in which the first surface 1 and the second surface 2 are spherical.

[0090] The second lens 120 is a lens with negative optical power, having a convex surface (third surface 3) facing the object side L1 and a concave surface (fourth surface 4) facing the image side L2. In this embodiment, the second lens 120 is a plastic lens with aspherical surfaces for the third surface 3 and the fourth surface 4.

[0091] The third lens 130 is a lens with positive optical power (referred to as a positive lens) whose concave surface (fifth surface 5) faces the object side L1 and whose convex surface (sixth surface 6) faces the image side L2. In this embodiment, the third lens 130 is a plastic lens with aspherical fifth surface 5 and sixth surface 6.

[0092] The fourth lens 140 is a lens with positive optical power, having a concave surface (seventh surface 7) facing the object side L1 and a convex surface (eighth surface 8) facing the image side L2. In this embodiment, the fourth lens 140 is a plastic lens with aspherical surfaces for the seventh surface 7 and the eighth surface 8.

[0093] The fifth lens 150 is a lens with positive optical power, having a convex surface (tenth surface 10) facing the object side L1 and a convex surface (eleventh surface 11) facing the image side L2. In this embodiment, the fifth lens 150 is made of a glass lens.

[0094] The sixth lens 160 is a lens having a negative refractive power with a concave surface (twelfth surface 12) toward the object side LI and a concave surface (thirteenth surface 13) toward 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.

[0095] The seventh lens 170 is a lens having a positive refractive power with a convex surface (thirteenth surface 13) toward the object side LI and a convex surface (fourteenth surface 14) toward 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.

[0096] Further, in the present embodiment, as shown in FIG. 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. Also, the sixth lens 160 and the seventh lens 170 are cemented together by an adhesive layer having a refractive index of 1.486 (i.e., an adhesive having a refractive index of 1.486 is used). FIG. 11B

[0097] In the present embodiment, the focal distance f (Effective Focal Length) of the entire lens system is 1.026 mm, the object-image distance d (Total Track) is 13.403 mm, the F value (Image Space F / #) is 2.02, the maximum half field angle (Max. 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.

[0098] The physical properties of each surface of the wide-angle lens 1000 of the present embodiment are shown in Table 1, and the aspherical coefficients of each surface of the wide-angle lens 1000 of the present embodiment are shown in Table 2-1 and Table 2-2.

[0099] (Table 1)

[0100]

[0101] In Table 1 above, the units of the radius of curvature, the thickness, the focal distance, the effective radius, and the sag are mm, Nd is the refractive index for a light ray of 587.56 nm, and * indicates an aspherical surface.

[0102] (Table 2-1)

[0103]

[0104] (Table 2-2)

[0105] ​ FIG. 12A to FIG. 12L 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

[0106] In Tables 2-1 and 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 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.

[0107] Further, in Tables 2-1 and 2-2 above, aspherical coefficients A4, A6, A8, A10, A12, A14, A16 at the time of expressing the aspherical shape of each surface by the following equation (Mathematical Formula 1) are shown. In the following equation, the sag amount (axial direction of the optical axis) is set to Z, the height in the direction perpendicular to the optical axis (height of the light ray) is set to r, the conic coefficient is set to K, and the reciprocal of the radius of curvature is set to c.

[0108] [Mathematical Formula 1]

[0109]

[0110] Here, in the wide-angle lens 1000, the radius of curvature of the object side lens surface of the sixth lens 160 (i.e., the twelfth surface 12) is -4.077 mm, and the radius of curvature of the image side lens surface of the sixth lens 160 (i.e., the thirteenth surface 13) is 1.068 mm, and thus the following condition 1 is satisfied:

[0111] 0 < (R61+R62) / (R61-R62) < 1.000.

[0112] In the condition 1, if (R61+R62) / (R61-R62) is 0 or less, the sixth lens has a shape in which the radius of curvature of the image side lens surface is larger than that of the object side lens surface, and it is not possible to correct the coma, the field curvature, the chromatic aberration of magnification, and the like of the sixth lens well; on the other hand, if (R61+R62) / (R61-R62) is 1.000 or more, it is not easy to correct the chromatic aberration well.

[0113] On the contrary, in the present embodiment, since the condition 1 is satisfied, there is an advantage that the coma, the field curvature, the chromatic aberration of magnification of the sixth lens can be corrected well and the chromatic aberration can be corrected well.

[0114] In particular, in the present embodiment, since 0 < (R61+R62) / (R61-R62) < 0.750 is satisfied, there is an advantage that the coma, the field curvature, the chromatic aberration of magnification of the sixth lens can be corrected more well and the chromatic aberration can be corrected more well.

[0115] Further, in the wide-angle lens 1000, the sagittal height Sag52 of the image-side lens surface of the fifth lens 150 is -0.369 mm, the effective radius sd52 of the image-side lens surface of the fifth lens 150 is 1.400 mm, the sagittal height Sag61 of the object-side lens surface of the sixth lens 160 is -0.184 mm, and the effective radius sd61 of the object-side lens surface of the sixth lens 160 is 1.173, and thus the following condition 2 is satisfied:

[0116] 1.000 < (Sag52 / sd52) / (Sag61 / sd61) < 3.000.

[0117] In the condition 2, if (Sag52 / sd52) / (Sag61 / sd61) is 1.000 or less, the radius of curvature of the image-side lens surface of the fifth lens 150 is smaller than the radius of curvature of the object-side lens surface of the sixth lens 160, the fifth lens 150 and the sixth lens 160 are not easily approached, the positioning accuracy of the fifth lens 150 or the sixth lens 160, the interval of the fifth lens 150 and the sixth lens 160, and the thickness accuracy of the fifth lens 150 and the sixth lens 160 become too high, and the assembly of the product is not easily performed; on the other hand, if (Sag52 / sd52) / (Sag61 / sd61) is 3.000 or more, various aberrations are not easily corrected well.

[0118] On the contrary, in the present embodiment, since the condition 2 is satisfied, there are advantages that the assembly of the product is easily performed and various aberrations are well corrected.

[0119] In particular, in the present embodiment, since the relationship of 1.400 < (Sag52 / sd52) / (Sag61 / sd61) < 2.500 is satisfied, there are advantages that the assembly of the product is more easily performed and various aberrations are more well corrected.

[0120] Further, in the wide-angle lens 1000, the ratio of the thickness T7 of the seventh lens 170 to the flange thickness C7 of the outer periphery of the seventh lens 170 is 3.159, and thus the following condition 3 is satisfied:

[0121] 2.000 < T7 / C7 < 3.500.

[0122] In the condition 3, if T7 / C7 is 2.000 or less, the convex lens surface of the seventh lens cannot be greatly projected, and it is difficult to effectively reduce aberrations such as chromatic aberration; on the other hand, if T7 / C7 is 3.500 or more, it is difficult to limit the distance in the optical axis direction between the gate provided on the side surface of the flange portion of the seventh lens and the top of the convex lens surface when resin molding of the seventh lens is performed using a mold, it is difficult to appropriately transmit the injection pressure at the time of resin molding to the top of the convex lens surface, and a fine recess caused by shrinkage of resin or the like is likely to occur at the top of the convex lens surface.

[0123] On the contrary, in the present embodiment, since the condition 3 is satisfied, there is an advantage that it is possible to effectively reduce aberrations such as chromatic aberration and a fine recess caused by shrinkage of resin or the like is less likely to occur at the top of the convex lens surface.

[0124] In particular, in the present embodiment, the relationship 2.300 < T7 / C7 < 3.200 is satisfied, and thus there is an advantage that it is possible to more effectively reduce aberrations such as chromatic aberration and a fine recess caused by shrinkage of resin or the like is less likely to occur at the top of the convex lens surface.

[0125] Further, in the wide-angle lens 1000, the ratio of the effective radius sd71 of the object side lens surface of the seventh lens 170 to the flange thickness C7 of the outer periphery of the seventh lens 170 is 1.558, and thus the following condition 4 is satisfied:

[0126] 1.100 < sd71 / C7 < 1.800.

[0127] In the condition 4, if sd71 / C7 is 1.100 or less, the convex lens surface of the seventh lens cannot be greatly projected, and it is difficult to effectively reduce aberrations such as chromatic aberration; on the other hand, if sd71 / C7 is 1.800 or more, it is difficult to limit the distance in the optical axis direction between the gate provided on the side surface of the flange portion of the seventh lens and the top of the convex lens surface when resin molding of the seventh lens is performed using a mold, it is difficult to appropriately transmit the injection pressure at the time of resin molding to the top of the convex lens surface, and a fine recess caused by shrinkage of resin or the like is likely to occur at the top of the convex lens surface.

[0128] On the contrary, in the present embodiment, since the condition 4 is satisfied, there is an advantage that it is possible to effectively reduce aberrations such as chromatic aberration and a fine recess caused by shrinkage of resin or the like is less likely to occur at the top of the convex lens surface.

[0129] In particular, in the present embodiment, the relationship 1.200 < sd71 / C7 < 1.600 is satisfied, and thus there is an advantage that it is possible to more effectively reduce aberrations such as chromatic aberration and a fine recess caused by shrinkage of resin or the like is less likely to occur at the top of the convex lens surface.

[0130] Further, in the wide-angle lens 1000, the sixth lens 160 and the seventh lens 170 are bonded together by an adhesive layer, the refractive index n6 of the sixth lens 160 is 1.635, the refractive index n0 of the adhesive layer is 1.486, and the refractive index n7 of the seventh lens 170 is 1.544, and thus the following condition 5 is satisfied:

[0131] |n6-n0| > |n7-n0|.

[0132] In the resin molding of the seventh lens using a mold, even if a slight concave portion is generated at the top of the convex lens surface due to shrinkage of the resin or the like, the adhesive layer can fill the above-mentioned concave portion at the time of forming the bonded lens, and in the case where the condition 5 is satisfied, the refractive index n0 of the adhesive layer is closer to the refractive index n7 of the seventh lens than the refractive index n6 of the sixth lens, and thus the adhesive layer filled in the above-mentioned concave portion can function as a part of the convex lens surface of the seventh lens, whereby the optical characteristics of the wide-angle lens are less likely to be reduced.

[0133] Further, in the wide-angle lens 1000, the combined focal distance f67 of the sixth lens 160 and the seventh lens 170 is 11.542 mm, and the focal distance f of the entire wide-angle lens is 1.026 mm, and thus the following condition 7 is satisfied:

[0134] 6.000 < f67 / f < 13.500.

[0135] In the present embodiment, since the condition 7 is satisfied, chromatic aberration can be appropriately corrected.

[0136] In particular, in the present embodiment, the relationship 8.000 < f67 / f < 12.000 is satisfied, and thus chromatic aberration can be more appropriately corrected.

[0137] Further, in the wide-angle lens 1000, the radius of curvature R71 of the object side lens surface of the seventh lens 170 is 1.068 mm, and the focal distance f of the entire wide-angle lens is 1.026 mm, and thus the following condition 8 is satisfied:

[0138] 0.800 < R71 / f < 1.200.

[0139] In the condition 8, if R71 / f is 0.800 or less, the radius of curvature of the bonding surface of the sixth lens 160 and the seventh lens 170 is too small, the sixth lens 160 and the seventh lens 170 are not easily formed, and the generation of spherical aberration is not easily suppressed; on the other hand, if R71 / f is 1.200 or more, various aberrations (particularly, chromatic aberration) are not easily appropriately corrected, and excellent optical characteristics are not easily achieved.

[0140] On the contrary, in the present embodiment, since the condition 8 is satisfied, there is an advantage that it is possible to achieve excellent optical characteristics while suppressing the generation of spherical aberration and appropriately correcting various aberrations (particularly, chromatic aberration).

[0141] Further, in the wide-angle lens 1000, the object-image distance d is 13.403 mm, the focal distance f of the entire lens system is 1.026 mm, and thus the following condition 9 is satisfied:

[0142] 11.000 < d / f < 15.000

[0143] In the condition 9, 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.

[0144] On the contrary, in the present embodiment, since the condition 9 is satisfied, it is easy to appropriately correct various aberrations, it is easy to achieve 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.

[0145] As described above, in the present embodiment, by configuring the wide-angle lens 1000 in the above-described manner, as shown in FIG. 17, it is possible to appropriately correct the coma, the field curvature, the magnification chromatic aberration, and the like of the sixth lens, and it is possible to appropriately correct the chromatic aberration. FIG. 12A to FIG. 12L

[0146] (Embodiment 2)

[0147] FIG. 9 is a view showing a wide-angle lens of Embodiment 2 of the present application, FIG. 9 is a view showing the field curvature and the distortion of the wide-angle lens of Embodiment 2 of the present application, Surface is a view showing the field curvature and the distortion of the wide-angle lens of Embodiment 2 of the present application, FIG. 10A to FIG. 12L is a view showing the lateral chromatic aberration (transverse chromatic aberration) of the wide-angle lens of Embodiment 2 of the present application, FIG. 13 is a view showing the spherical aberration (longitudinal chromatic aberration) of the wide-angle lens of Embodiment 2 of the present application, FIG. 14A is a view showing the transverse chromatic aberration of the wide-angle lens of Embodiment 2 of the present application. Here, in FIG. 14B , FIG. 15A , FIG. 15B , FIG. 16A to FIG. 16L , FIG. 14A in FIGS. 18 to 21, 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, and S indicates the sagittal plane, and in FIG. 14B ​In the figure, the maximum scale of the vertical axis is ±50.000 μm.

[0148] like FIG. 15A 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.

[0149] 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.

[0150] In addition, such as FIG. 15B As shown, similar to 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 imaging element 300 is disposed on the image side of the filter 200. Furthermore, similar to Embodiment 1, the sixth lens 160 and the seventh lens 170 are bonded together by an adhesive layer with a refractive index of 1.486 (i.e., an adhesive with a refractive index of 1.486 is used).

[0151] In this embodiment, the overall focal length f (Effective Focal Length) of the lens system is 1.011 mm, the object-to-image distance d (Total Track) is 13.404 mm, the image space F / # is 2.03, the maximum field of view is 109 degrees, the entrance pupil diameter HEP is 0.498 mm, and the maximum image height HOI is 2.060 mm.

[0152] Table 3 shows the physical properties of each facet of the wide-angle lens 1000 of this embodiment, and Tables 4-1 and 4-2 show the aspherical coefficients of each facet of the wide-angle lens 1000 of this embodiment.

[0153] (Table 3)

[0154]

[0155] In Table 3 above, the units of the radius of curvature, the thickness, the back focal distance, the effective radius, and the sag are mm, Nd is the refractive index for a light ray of 587.56 nm, and * indicates an aspheric surface.

[0156] (Table 4-1)

[0157]

[0158] (Table 4-2)

[0159] FIG. 16A to FIG. 16L 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

[0160] In Table 4-1 and Table 4-2 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.

[0161] Further, in Table 4-1 and Table 4-2 above, the aspheric coefficients A4, A6, A8, A10, A12, A14, and A16 are shown when the aspheric shape of each surface is expressed by Mathematical Formula 1 above.

[0162] Here, in the wide-angle lens 1000, the radius of curvature of the object side lens surface (i.e., the twelfth surface 12) of the sixth lens 160 is -4.136 mm, and the radius of curvature of the image side lens surface (i.e., the thirteenth surface 13) of the sixth lens 160 is 0.946 mm, and thus, the following Condition 1 is satisfied:

[0163] 0 < (R61+R62) / (R61-R62) < 1.000.

[0164] In Condition 1, if (R61+R62) / (R61-R62) is 0 or less, the sixth lens has a shape in which the radius of curvature of the image side lens surface is larger than the radius of curvature of the object side lens surface, and it is not possible to correct the coma, the field curvature, the lateral chromatic aberration, and the like of the sixth lens well; on the other hand, if (R61+R62) / (R61-R62) is 1.000 or more, it is not easy to correct the chromatic aberration well.

[0165] On the contrary, in the present embodiment, since Condition 1 is satisfied, there is an advantage that the coma, the field curvature, the lateral chromatic aberration, and the like of the sixth lens can be corrected well and the chromatic aberration can be corrected well.

[0166] In particular, in the present embodiment, since 0 < (R61+R62) / (R61-R62) < 0.750 is satisfied, there is an advantage that the coma, the field curvature, the lateral chromatic aberration, and the like of the sixth lens can be corrected even more well and the chromatic aberration can be corrected even more well.

[0167] Further, in the wide-angle lens 1000, the sagittal height Sag52 of the image-side lens surface of the fifth lens 150 is -0.513 mm, the effective radius sd52 of the image-side lens surface of the fifth lens 150 is 1.500 mm, the sagittal height Sag61 of the object-side lens surface of the sixth lens 160 is -0.170 mm, and the effective radius sd61 of the object-side lens surface of the sixth lens 160 is 1.083, and thus the following condition 2 is satisfied:

[0168] 1.000 < (Sag52 / sd52) / (Sag61 / sd61) < 3.000.

[0169] In the condition 2, if (Sag52 / sd52) / (Sag61 / sd61) is 1.000 or less, the radius of curvature of the image-side lens surface of the fifth lens 150 is smaller than the radius of curvature of the object-side lens surface of the sixth lens 160, the fifth lens 150 and the sixth lens 160 are not easily approached, the positioning accuracy of the fifth lens 150 or the sixth lens 160, the interval of the fifth lens 150 and the sixth lens 160, and the thickness accuracy of the fifth lens 150 and the sixth lens 160 become too high, and the assembly of the product is not easily performed; on the other hand, if (Sag52 / sd52) / (Sag61 / sd61) is 3.000 or more, various aberrations are not easily corrected well.

[0170] On the contrary, in the present embodiment, since the condition 2 is satisfied, there are advantages that the assembly of the product is easily performed and various aberrations are well corrected.

[0171] In particular, in the present embodiment, since the relationship of 1.400 < (Sag52 / sd52) / (Sag61 / sd61) < 2.500 is satisfied, there are advantages that the assembly of the product is more easily performed and various aberrations are more well corrected.

[0172] Further, in the wide-angle lens 1000, the ratio of the thickness T7 of the seventh lens 170 to the flange thickness C7 of the outer periphery of the seventh lens 170 is 2.784, and thus the following condition 3 is satisfied:

[0173] 2.000 < T7 / C7 < 3.500.

[0174] In the condition 3, if T7 / C7 is 2.000 or less, the convex lens surface of the seventh lens cannot be greatly projected, and it is difficult to effectively reduce aberrations such as chromatic aberration; on the other hand, if T7 / C7 is 3.500 or more, it is difficult to limit the distance in the optical axis direction between the gate provided on the side surface of the flange portion of the seventh lens and the top of the convex lens surface when resin molding of the seventh lens is performed using a mold, it is difficult to appropriately transmit the injection pressure at the time of resin molding to the top of the convex lens surface, and a fine recess caused by shrinkage of resin or the like is likely to occur at the top of the convex lens surface.

[0175] On the contrary, in the present embodiment, since the condition 3 is satisfied, there are advantages that aberrations such as chromatic aberration can be effectively reduced and a fine recess caused by shrinkage of resin or the like is less likely to occur at the top of the convex lens surface.

[0176] In particular, in the present embodiment, the relationship 2.300 < T7 / C7 < 3.200 is satisfied, and thus there are advantages that aberrations such as chromatic aberration can be more effectively reduced and a fine recess caused by shrinkage of resin or the like is less likely to occur at the top of the convex lens surface.

[0177] Further, in the wide-angle lens 1000, the ratio of the effective radius sd71 of the object side lens surface of the seventh lens 170 to the flange thickness C7 of the outer periphery of the seventh lens 170 is 1.219, and thus the following condition 4 is satisfied:

[0178] 1.100 < sd71 / C7 < 1.800.

[0179] In the condition 4, if sd71 / C7 is 1.100 or less, the convex lens surface of the seventh lens cannot be greatly projected, and it is difficult to effectively reduce aberrations such as chromatic aberration; on the other hand, if sd71 / C7 is 1.800 or more, it is difficult to limit the distance in the optical axis direction between the gate provided on the side surface of the flange portion of the seventh lens and the top of the convex lens surface when resin molding of the seventh lens is performed using a mold, it is difficult to appropriately transmit the injection pressure at the time of resin molding to the top of the convex lens surface, and a fine recess caused by shrinkage of resin or the like is likely to occur at the top of the convex lens surface.

[0180] On the contrary, in the present embodiment, since the condition 4 is satisfied, there are advantages that aberrations such as chromatic aberration can be effectively reduced and a fine recess caused by shrinkage of resin or the like is less likely to occur at the top of the convex lens surface.

[0181] In particular, in the present embodiment, the relationship 1.200 < sd71 / C7 < 1.600 is satisfied, and thus there are advantages that aberrations such as chromatic aberration can be more effectively reduced and a fine recess caused by shrinkage of resin or the like is less likely to occur at the top of the convex lens surface.

[0182] Further, in the wide-angle lens 1000, the sixth lens 160 and the seventh lens 170 are bonded together by an adhesive layer, the refractive index n6 of the sixth lens 160 is 1.635, the refractive index n0 of the adhesive layer is 1.486, and the refractive index n7 of the seventh lens 170 is 1.544, and thus the following condition 5 is satisfied:

[0183] |n6-n0| > |n7-n0|.

[0184] In the resin molding of the seventh lens using a mold, even if a slight concave portion is generated at the top of the convex lens surface due to shrinkage of the resin or the like, the adhesive layer can fill the above-mentioned concave portion when the cemented lens is formed, and in the case where the condition 5 is satisfied, the refractive index n0 of the adhesive layer is closer to the refractive index n7 of the seventh lens than the refractive index n6 of the sixth lens, and thus the adhesive layer filled in the above-mentioned concave portion can function as a part of the convex lens surface of the seventh lens, whereby the optical characteristics of the wide-angle lens are less likely to be reduced.

[0185] Further, in the wide-angle lens 1000, the combined focal distance f67 of the sixth lens 160 and the seventh lens 170 is 8.497 mm, and the focal distance f of the entire wide-angle lens is 1.011 mm, and thus the following condition 7 is satisfied:

[0186] 6.000 < f67 / f < 13.500.

[0187] In the present embodiment, since the condition 7 is satisfied, chromatic aberration can be appropriately corrected.

[0188] In particular, in the present embodiment, the relationship 8.000 < f67 / f < 12.000 is satisfied, and thus chromatic aberration can be more appropriately corrected.

[0189] Further, in the wide-angle lens 1000, the radius of curvature R71 of the object side lens surface of the seventh lens 170 is 0.946 mm, and the focal distance f of the entire wide-angle lens is 1.011 mm, and thus the following condition 8 is satisfied:

[0190] 0.800 < R71 / f < 1.200.

[0191] In the condition 8, if R71 / f is 0.800 or less, the radius of curvature of the bonding surface of the sixth lens 160 and the seventh lens 170 is too small, the sixth lens 160 and the seventh lens 170 are not easily formed, and the generation of spherical aberration is not easily suppressed; on the other hand, if R71 / f is 1.200 or more, various aberrations (particularly, chromatic aberration) are not easily appropriately corrected, and excellent optical characteristics are not easily achieved.

[0192] On the contrary, in the present embodiment, since the condition 8 is satisfied, there are advantages that the generation of spherical aberration can be suppressed and various aberrations (particularly, chromatic aberration) can be appropriately corrected, and excellent optical characteristics can be achieved.

[0193] Further, in the wide-angle lens 1000, the object-image distance d is 13.404 mm, the focal distance f of the entire lens system is 1.011 mm, and thus the following condition 9 is satisfied:

[0194] 11.000 < d / f < 15.000

[0195] In the condition 9, if d / f is 11.000 or less, various aberrations are not easily appropriately corrected, and on the other hand, if d / f is 15.000 or more, the length of the entire lens system becomes too long.

[0196] On the contrary, in the present embodiment, since the condition 9 is satisfied, various aberrations are easily appropriately corrected, excellent optical characteristics are easily obtained, and the entire lens system can be suppressed from becoming too large while avoiding the length of the entire lens system from becoming too long.

[0197] As described above, in the present embodiment, by configuring the wide-angle lens 1000 in the above-described manner, as shown in FIG. 17, the coma, the field curvature, the magnification chromatic aberration, and the like of the sixth lens are well corrected, and the chromatic aberration is well corrected. FIG. 16A to FIG. 16L

[0198] (Embodiment 3)

[0199] FIG. 13 is a view showing a wide-angle lens of Embodiment 3 of the present application, FIG. 13 is a view showing the field curvature and the distortion of the wide-angle lens of Embodiment 3 of the present application, Surface is a view showing the field curvature and the distortion of the wide-angle lens of Embodiment 3 of the present application, FIG. 14A to FIG. 16L is a view showing the sagittal chromatic aberration (lateral chromatic aberration) of the wide-angle lens of Embodiment 3 of the present application, FIG. 17 is a view showing the spherical aberration (longitudinal chromatic aberration) of the wide-angle lens of Embodiment 3 of the present application, FIG. 18A is a view showing the lateral chromatic aberration of the wide-angle lens of Embodiment 3 of the present application. Here, in FIG. 18B , FIG. 19A , FIG. 19B , FIG. 20A to FIG. 20L , FIG. 18A , 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. 18B ​In the figure, the maximum scale of the vertical axis is ±50.000 μm.

[0200] like FIG. 19A 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.

[0201] 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.

[0202] In addition, such as FIG. 19B As shown, similar to 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 imaging element 300 is disposed on the image side of the filter 200. Furthermore, similar to Embodiment 1, the sixth lens 160 and the seventh lens 170 are bonded together by an adhesive layer with a refractive index of 1.486 (i.e., an adhesive with a refractive index of 1.486 is used).

[0203] In this embodiment, the overall focal length f (Effective Focal Length) of the lens system is 1.021 mm, the object-to-image distance d (Total Track) is 13.398 mm, the image space F / # is 2, the maximum field of view is 108 degrees, the entrance pupil diameter HEP is 0.511 mm, and the maximum image height HOI is 1.934 mm.

[0204] Table 5 shows the physical properties of each facet of the wide-angle lens 1000 of this embodiment, and Tables 6-1 and 6-2 show the aspherical coefficients of each facet of the wide-angle lens 1000 of this embodiment.

[0205] (Table 5)

[0206]

[0207] In Table 5 above, the units of the radius of curvature, the thickness, the back focal distance, the effective radius, and the sag are mm, Nd is the refractive index for a light ray of 587.56 nm, and * indicates an aspheric surface.

[0208] (Table 6-1)

[0209]

[0210] (Table 6-2)

[0211] FIG. 20A to FIG. 20L 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

[0212] In Table 6-1 and Table 6-2 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.

[0213] Further, in Table 6-1 and Table 6-2 above, the aspheric coefficients A4, A6, A8, A10, A12, A14, and A16 are shown when the aspheric shape of each surface is expressed by Mathematical Formula 1 above.

[0214] Here, in the wide-angle lens 1000, the radius of curvature of the object side lens surface (i.e., the twelfth surface 12) of the sixth lens 160 is -5.730 mm, and the radius of curvature of the image side lens surface (i.e., the thirteenth surface 13) of the sixth lens 160 is 0.910 mm, and thus the following Condition 1 is satisfied:

[0215] 0 < (R61+R62) / (R61-R62) < 1.000.

[0216] In Condition 1, if (R61+R62) / (R61-R62) is 0 or less, the sixth lens has a shape in which the radius of curvature of the image side lens surface is larger than the radius of curvature of the object side lens surface, and it is not possible to correct the coma, the field curvature, the lateral chromatic aberration, and the like of the sixth lens well; on the other hand, if (R61+R62) / (R61-R62) is 1.000 or more, it is not easy to correct the chromatic aberration well.

[0217] On the contrary, in the present embodiment, since Condition 1 is satisfied, there is an advantage that the coma, the field curvature, the lateral chromatic aberration, and the like of the sixth lens can be corrected well and the chromatic aberration can be corrected well.

[0218] In particular, in the present embodiment, since 0 < (R61+R62) / (R61-R62) < 0.750 is satisfied, there is an advantage that the coma, the field curvature, the lateral chromatic aberration, and the like of the sixth lens can be corrected even more well and the chromatic aberration can be corrected even more well.

[0219] Further, in the wide-angle lens 1000, the sagittal height Sag52 of the image-side lens surface of the fifth lens 150 is -0.355 mm, the effective radius sd52 of the image-side lens surface of the fifth lens 150 is 1.500 mm, the sagittal height Sag61 of the object-side lens surface of the sixth lens 160 is -0.186 mm, and the effective radius sd61 of the object-side lens surface of the sixth lens 160 is 1.250, and thus the following condition 2 is satisfied:

[0220] 1.000 < (Sag52 / sd52) / (Sag61 / sd61) < 3.000.

[0221] In the condition 2, if (Sag52 / sd52) / (Sag61 / sd61) is 1.000 or less, the radius of curvature of the image-side lens surface of the fifth lens 150 is smaller than the radius of curvature of the object-side lens surface of the sixth lens 160, the fifth lens 150 and the sixth lens 160 are not easily approached, the positioning accuracy of the fifth lens 150 or the sixth lens 160, the interval of the fifth lens 150 and the sixth lens 160, and the thickness accuracy of the fifth lens 150 and the sixth lens 160 become too high, and the assembly of the product is not easily performed; on the other hand, if (Sag52 / sd52) / (Sag61 / sd61) is 3.000 or more, various aberrations are not easily corrected well.

[0222] On the contrary, in the present embodiment, since the condition 2 is satisfied, there are advantages that the assembly of the product is easily performed and various aberrations are well corrected.

[0223] In particular, in the present embodiment, since the relationship of 1.400 < (Sag52 / sd52) / (Sag61 / sd61) < 2.500 is satisfied, there are advantages that the assembly of the product is more easily performed and various aberrations are more well corrected.

[0224] Further, in the wide-angle lens 1000, the ratio of the thickness T7 of the seventh lens 170 to the flange thickness C7 of the outer periphery of the seventh lens 170 is 3.045, and thus the following condition 3 is satisfied:

[0225] 2.000 < T7 / C7 < 3.500.

[0226] In the condition 3, if T7 / C7 is 2.000 or less, the convex lens surface of the seventh lens cannot be greatly projected, and it is difficult to effectively reduce aberrations such as chromatic aberration; on the other hand, if T7 / C7 is 3.500 or more, it is difficult to limit the distance in the optical axis direction between the gate provided on the side surface of the flange portion of the seventh lens and the top of the convex lens surface when resin molding of the seventh lens is performed using a mold, it is difficult to appropriately transmit the injection pressure at the time of resin molding to the top of the convex lens surface, and a fine recess caused by shrinkage of resin or the like is likely to occur at the top of the convex lens surface.

[0227] On the contrary, in the present embodiment, since the condition 3 is satisfied, there are advantages that aberrations such as chromatic aberration can be effectively reduced and a fine recess caused by shrinkage of resin or the like is less likely to occur at the top of the convex lens surface.

[0228] In particular, in the present embodiment, the relationship 2.300 < T7 / C7 < 3.200 is satisfied, and thus there are advantages that aberrations such as chromatic aberration can be more effectively reduced and a fine recess caused by shrinkage of resin or the like is less likely to occur at the top of the convex lens surface.

[0229] Further, in the wide-angle lens 1000, the ratio of the effective radius sd71 of the object side lens surface of the seventh lens 170 to the flange thickness C7 of the outer periphery of the seventh lens 170 is 1.537, and thus the following condition 4 is satisfied:

[0230] 1.100 < sd71 / C7 < 1.800.

[0231] In the condition 4, if sd71 / C7 is 1.100 or less, the convex lens surface of the seventh lens cannot be greatly projected, and it is difficult to effectively reduce aberrations such as chromatic aberration; on the other hand, if sd71 / C7 is 1.800 or more, it is difficult to limit the distance in the optical axis direction between the gate provided on the side surface of the flange portion of the seventh lens and the top of the convex lens surface when resin molding of the seventh lens is performed using a mold, it is difficult to appropriately transmit the injection pressure at the time of resin molding to the top of the convex lens surface, and a fine recess caused by shrinkage of resin or the like is likely to occur at the top of the convex lens surface.

[0232] On the contrary, in the present embodiment, since the condition 4 is satisfied, there are advantages that aberrations such as chromatic aberration can be effectively reduced and a fine recess caused by shrinkage of resin or the like is less likely to occur at the top of the convex lens surface.

[0233] In particular, in the present embodiment, the relationship 1.200 < sd71 / C7 < 1.600 is satisfied, and thus there are advantages that aberrations such as chromatic aberration can be more effectively reduced and a fine recess caused by shrinkage of resin or the like is less likely to occur at the top of the convex lens surface.

[0234] Further, in the wide-angle lens 1000, the sixth lens 160 and the seventh lens 170 are bonded together by an adhesive layer, the refractive index n6 of the sixth lens 160 is 1.635, the refractive index n0 of the adhesive layer is 1.486, and the refractive index n7 of the seventh lens 170 is 1.544, and thus the following condition 5 is satisfied:

[0235] |n6-n0| > |n7-n0|.

[0236] In the resin molding of the seventh lens using a mold, even if a slight concave portion is generated at the top of the convex lens surface due to shrinkage of the resin or the like, the adhesive layer can fill the above-mentioned concave portion when the cemented lens is formed, and in the case where the condition 5 is satisfied, the refractive index n0 of the adhesive layer is closer to the refractive index n7 of the seventh lens than the refractive index n6 of the sixth lens, and thus the adhesive layer filled in the above-mentioned concave portion can function as a part of the convex lens surface of the seventh lens, whereby the optical characteristics of the wide-angle lens are less likely to be reduced.

[0237] Further, in the wide-angle lens 1000, the combined focal distance f67 of the sixth lens 160 and the seventh lens 170 is 9.670 mm, and the focal distance f of the entire wide-angle lens is 1.021 mm, and thus the following condition 7 is satisfied:

[0238] 6.000 < f67 / f < 13.500.

[0239] In the present embodiment, since the condition 7 is satisfied, chromatic aberration can be appropriately corrected.

[0240] In particular, in the present embodiment, the relationship 8.000 < f67 / f < 12.000 is satisfied, and thus chromatic aberration can be more appropriately corrected.

[0241] Further, in the wide-angle lens 1000, the radius of curvature R71 of the object side lens surface of the seventh lens 170 is 0.910 mm, and the focal distance f of the entire wide-angle lens is 1.021 mm, and thus the following condition 8 is satisfied:

[0242] 0.800 < R71 / f < 1.200.

[0243] In the condition 8, if R71 / f is 0.800 or less, the radius of curvature of the bonding surface of the sixth lens 160 and the seventh lens 170 is too small, the sixth lens 160 and the seventh lens 170 are not easily formed, and the generation of spherical aberration is not easily suppressed; on the other hand, if R71 / f is 1.200 or more, various aberrations (particularly, chromatic aberration) are not easily appropriately corrected, and excellent optical characteristics are not easily achieved.

[0244] On the contrary, in the present embodiment, since the condition 8 is satisfied, there is an advantage that it is possible to achieve excellent optical characteristics while suppressing the generation of spherical aberration and appropriately correcting various aberrations (particularly, chromatic aberration).

[0245] 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 9 is satisfied:

[0246] 11.000 < d / f < 15.000

[0247] In the condition 9, 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.

[0248] On the contrary, in the present embodiment, since the condition 9 is satisfied, it is easy to appropriately correct various aberrations, it is easy to achieve 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.

[0249] As described above, in the present embodiment, by configuring the wide-angle lens 1000 in the above-described manner, as shown in FIG. 17, it is possible to appropriately correct the coma, the field curvature, the magnification chromatic aberration, and the like of the sixth lens, and it is possible to appropriately correct the chromatic aberration. FIG. 20A to FIG. 20L

[0250] (Embodiment 4)

[0251] FIG. 17 is a view showing a wide-angle lens of Embodiment 4 of the present application, FIG. 17 is a view showing the field curvature and the distortion of the wide-angle lens of Embodiment 4 of the present application, Surface is a view showing the field curvature and the distortion of the wide-angle lens of Embodiment 4 of the present application, FIG. 18A to FIG. 20L is a view showing the lateral chromatic aberration (transverse chromatic aberration) of the wide-angle lens of Embodiment 4 of the present application, FIG. 21 is a view showing the spherical aberration (longitudinal chromatic aberration) of the wide-angle lens of Embodiment 4 of the present application, FIG. 22A is a view showing the transverse chromatic aberration of the wide-angle lens of Embodiment 4 of the present application. Here, in FIG. 22B FIG. 23A FIG. 23B FIG. 24A to FIG. 24L FIG. 22A in FIGS. 18 to 21, 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, and S indicates the sagittal plane, and in FIG. 22B ​​​​​In the figure, the maximum scale of the vertical axis is ±50.000 μm.

[0252] like FIG. 23A 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.

[0253] 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.

[0254] In addition, such as FIG. 23B As shown, similar to 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 imaging element 300 is disposed on the image side of the filter 200. Furthermore, similar to Embodiment 1, the sixth lens 160 and the seventh lens 170 are bonded together by an adhesive layer with a refractive index of 1.486 (i.e., an adhesive with a refractive index of 1.486 is used).

[0255] 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.

[0256] Table 7 shows the physical properties of each facet of the wide-angle lens 1000 of this embodiment, and Tables 8-1 and 8-2 show the aspherical coefficients of each facet of the wide-angle lens 1000 of this embodiment.

[0257] (Table 7)

[0258]

[0259] In Table 7 above, the units of the radius of curvature, the thickness, the back focal distance, the effective radius, and the sag are mm, Nd is the refractive index for a light ray of 587.56 nm, and * indicates an aspheric surface.

[0260] (Table 8-1)

[0261]

[0262] (Table 8-2)

[0263] FIG. 24A to FIG. 24L 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

[0264] In Table 8-1 and Table 8-2 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.

[0265] Further, in Table 8-1 and Table 8-2 above, the aspheric coefficients A4, A6, A8, A10, A12, A14, and A16 are shown when the aspheric shape of each surface is represented by Mathematical Formula 1 above.

[0266] Here, in the wide-angle lens 1000, the radius of curvature of the object side lens surface (i.e., the twelfth surface 12) of the sixth lens 160 is -3.600 mm, and the radius of curvature of the image side lens surface (i.e., the thirteenth surface 13) of the sixth lens 160 is 0.963 mm, and thus, the following Condition 1 is satisfied:

[0267] 0 < (R61+R62) / (R61-R62) < 1.000.

[0268] In Condition 1, if (R61+R62) / (R61-R62) is 0 or less, the sixth lens has a shape in which the radius of curvature of the image side lens surface is larger than the radius of curvature of the object side lens surface, and it is not possible to correct the coma, the field curvature, the lateral chromatic aberration, and the like of the sixth lens well; on the other hand, if (R61+R62) / (R61-R62) is 1.000 or more, it is not easy to correct the chromatic aberration well.

[0269] On the contrary, in the present embodiment, since Condition 1 is satisfied, there is an advantage that the coma, the field curvature, the lateral chromatic aberration, and the like of the sixth lens can be corrected well and the chromatic aberration can be corrected well.

[0270] In particular, in the present embodiment, since 0 < (R61+R62) / (R61-R62) < 0.750 is satisfied, there is an advantage that the coma, the field curvature, the lateral chromatic aberration, and the like of the sixth lens can be corrected even more well and the chromatic aberration can be corrected even more well.

[0271] Further, in the wide-angle lens 1000, the sagittal height Sag52 of the image-side lens surface of the fifth lens 150 is -0.513 mm, the effective radius sd52 of the image-side lens surface of the fifth lens 150 is 1.500 mm, the sagittal height Sag61 of the object-side lens surface of the sixth lens 160 is -0.259 mm, and the effective radius sd61 of the object-side lens surface of the sixth lens 160 is 1.250, and thus the following condition 2 is satisfied:

[0272] 1.000 < (Sag52 / sd52) / (Sag61 / sd61) < 3.000.

[0273] In the condition 2, if (Sag52 / sd52) / (Sag61 / sd61) is 1.000 or less, the radius of curvature of the image-side lens surface of the fifth lens 150 is smaller than the radius of curvature of the object-side lens surface of the sixth lens 160, the fifth lens 150 and the sixth lens 160 are not easily approached, the positioning accuracy of the fifth lens 150 or the sixth lens 160, the interval of the fifth lens 150 and the sixth lens 160, and the thickness accuracy of the fifth lens 150 and the sixth lens 160 become too high, and the assembly of the product is not easily performed; on the other hand, if (Sag52 / sd52) / (Sag61 / sd61) is 3.000 or more, various aberrations are not easily corrected well.

[0274] On the contrary, in the present embodiment, since the condition 2 is satisfied, there are advantages that the assembly of the product is easily performed and various aberrations are well corrected.

[0275] In particular, in the present embodiment, since the relationship of 1.400 < (Sag52 / sd52) / (Sag61 / sd61) < 2.500 is satisfied, there are advantages that the assembly of the product is more easily performed and various aberrations are more well corrected.

[0276] Further, in the wide-angle lens 1000, the ratio of the thickness T7 of the seventh lens 170 to the flange thickness C7 of the outer periphery of the seventh lens 170 is 2.855, and thus the following condition 3 is satisfied:

[0277] 2.000 < T7 / C7 < 3.500.

[0278] In the condition 3, if T7 / C7 is 2.000 or less, the convex lens surface of the seventh lens cannot be greatly projected, and it is difficult to effectively reduce aberrations such as chromatic aberration; on the other hand, if T7 / C7 is 3.500 or more, it is difficult to limit the distance in the optical axis direction between the gate provided on the side surface of the flange portion of the seventh lens and the top of the convex lens surface when resin molding of the seventh lens is performed using a mold, it is difficult to appropriately transmit the injection pressure at the time of resin molding to the top of the convex lens surface, and a fine recess caused by shrinkage of resin or the like is likely to occur at the top of the convex lens surface.

[0279] On the contrary, in the present embodiment, since the condition 3 is satisfied, there are advantages that aberrations such as chromatic aberration can be effectively reduced and a fine recess caused by shrinkage of resin or the like is less likely to occur at the top of the convex lens surface.

[0280] In particular, in the present embodiment, the relationship 2.300 < T7 / C7 < 3.200 is satisfied, and thus there are advantages that aberrations such as chromatic aberration can be more effectively reduced and a fine recess caused by shrinkage of resin or the like is less likely to occur at the top of the convex lens surface.

[0281] Further, in the wide-angle lens 1000, the ratio of the effective radius sd71 of the object side lens surface of the seventh lens 170 to the flange thickness C7 of the outer periphery of the seventh lens 170 is 1.405, and thus the following condition 4 is satisfied:

[0282] 1.100 < sd71 / C7 < 1.800.

[0283] In the condition 4, if sd71 / C7 is 1.100 or less, the convex lens surface of the seventh lens cannot be greatly projected, and it is difficult to effectively reduce aberrations such as chromatic aberration; on the other hand, if sd71 / C7 is 1.800 or more, it is difficult to limit the distance in the optical axis direction between the gate provided on the side surface of the flange portion of the seventh lens and the top of the convex lens surface when resin molding of the seventh lens is performed using a mold, it is difficult to appropriately transmit the injection pressure at the time of resin molding to the top of the convex lens surface, and a fine recess caused by shrinkage of resin or the like is likely to occur at the top of the convex lens surface.

[0284] On the contrary, in the present embodiment, since the condition 4 is satisfied, there are advantages that aberrations such as chromatic aberration can be effectively reduced and a fine recess caused by shrinkage of resin or the like is less likely to occur at the top of the convex lens surface.

[0285] In particular, in the present embodiment, the relationship 1.200 < sd71 / C7 < 1.600 is satisfied, and thus there are advantages that aberrations such as chromatic aberration can be more effectively reduced and a fine recess caused by shrinkage of resin or the like is less likely to occur at the top of the convex lens surface.

[0286] Further, in the wide-angle lens 1000, the sixth lens 160 and the seventh lens 170 are bonded together by an adhesive layer, the refractive index n6 of the sixth lens 160 is 1.544, the refractive index n0 of the adhesive layer is 1.486, and the refractive index n7 of the seventh lens 170 is 1.000, and thus the following condition 5 is satisfied:

[0287] |n6-n0| > |n7-n0|.

[0288] In the resin molding of the seventh lens using a mold, even if a slight concave portion is generated at the top of the convex lens surface due to shrinkage of the resin or the like, the adhesive layer can fill the above-mentioned concave portion when the cemented lens is formed, and in the case where the condition 5 is satisfied, the refractive index n0 of the adhesive layer is closer to the refractive index n7 of the seventh lens than the refractive index n6 of the sixth lens, and thus the adhesive layer filled in the above-mentioned concave portion can function as a part of the convex lens surface of the seventh lens, whereby the optical characteristics of the wide-angle lens are less likely to be reduced.

[0289] Further, in the wide-angle lens 1000, the combined focal distance f67 of the sixth lens 160 and the seventh lens 170 is 10.463 mm, and the focal distance f of the entire wide-angle lens is 1.018 mm, and thus the following condition 7 is satisfied:

[0290] 6.000 < f67 / f < 13.500.

[0291] In the present embodiment, since the condition 7 is satisfied, chromatic aberration can be appropriately corrected.

[0292] In particular, in the present embodiment, the relationship 8.000 < f67 / f < 12.000 is satisfied, and thus chromatic aberration can be more appropriately corrected.

[0293] Further, in the wide-angle lens 1000, the radius of curvature R71 of the object side lens surface of the seventh lens 170 is 0.963 mm, and the focal distance f of the entire wide-angle lens is 1.018 mm, and thus the following condition 8 is satisfied:

[0294] 0.800 < R71 / f < 1.200.

[0295] In the condition 8, if R71 / f is 0.800 or less, the radius of curvature of the bonding surface of the sixth lens 160 and the seventh lens 170 is too small, the sixth lens 160 and the seventh lens 170 are not easily formed, and the generation of spherical aberration is not easily suppressed; on the other hand, if R71 / f is 1.200 or more, various aberrations (particularly, chromatic aberration) are not easily appropriately corrected, and excellent optical characteristics are not easily achieved.

[0296] On the contrary, in the present embodiment, since the condition 8 is satisfied, there are advantages that the generation of spherical aberration can be suppressed and various aberrations (particularly, chromatic aberration) can be appropriately corrected, and excellent optical characteristics can be achieved.

[0297] Further, in the wide-angle lens 1000, the object-image distance d is 13.383 mm, the focal distance f of the entire lens system is 1.018 mm, and thus the following condition 9 is satisfied:

[0298] 11.000 < d / f < 15.000

[0299] In the condition 9, if d / f is 11.000 or less, various aberrations are not easily appropriately corrected, and on the other hand, if d / f is 15.000 or more, the length of the entire lens system becomes too long.

[0300] On the contrary, in the present embodiment, since the condition 9 is satisfied, various aberrations are easily appropriately corrected, excellent optical characteristics are easily obtained, and the entire lens system can be suppressed from becoming too large while avoiding the length of the entire lens system from becoming too long.

[0301] As described above, in the present embodiment, by configuring the wide-angle lens 1000 in the above-described manner, as shown in FIG. 17, the coma, the field curvature, the magnification chromatic aberration, and the like of the sixth lens are well corrected, and the chromatic aberration is well corrected. FIG. 24A to FIG. 24L

[0302] (Embodiment 5)

[0303] FIG. 21 is a view showing a wide-angle lens of Embodiment 5 of the present application, FIG. 21 is a view showing the field curvature and the distortion of the wide-angle lens of Embodiment 5 of the present application, Surface is a view showing the field curvature and the distortion of the wide-angle lens of Embodiment 5 of the present application, FIG. 22A to FIG. 24L is a view showing the sagittal chromatic aberration (lateral chromatic aberration) of the wide-angle lens of Embodiment 5 of the present application, ​ is a view showing the spherical aberration (longitudinal aberration) of the wide-angle lens of Embodiment 5 of the present application, ​ is a view showing the lateral aberration of the wide-angle lens of Embodiment 5 of the present application. Here, in ​ , ​ , ​ , ​ , ​ in FIGS. 17 to 21, 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 tangential direction, S indicates the sagittal direction, and in ​ ​In the figure, the maximum scale of the vertical axis is ±50.000 μm.

[0304] like ​ 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.

[0305] 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.

[0306] In addition, such as ​ As shown, similar to 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 imaging element 300 is disposed on the image side of the filter 200. Furthermore, similar to Embodiment 1, the sixth lens 160 and the seventh lens 170 are bonded together by an adhesive layer with a refractive index of 1.486 (i.e., an adhesive with a refractive index of 1.486 is used).

[0307] 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 13.381 mm, the image space F / # is 2.0163, the maximum field of view is 108 degrees, the entrance pupil diameter HEP is 0.505 mm, and the maximum image height HOI is 2.061 mm.

[0308] Table 9 shows the physical properties of each facet of the wide-angle lens 1000 of this embodiment, and Tables 10-1 and 10-2 show the aspherical coefficients of each facet of the wide-angle lens 1000 of this embodiment.

[0309] (Table 9)

[0310]

[0311] In Table 9 above, the units of the radius of curvature, the thickness, the back focal distance, the effective radius, and the sag are mm, Nd is the refractive index for a light ray of 587.56 nm, and * indicates an aspheric surface.

[0312] (Table 10-1)

[0313]

[0314] (Table 10-2)

[0315] ​ 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

[0316] In Table 10-1 and Table 10-2 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.

[0317] Further, in Table 10-1 and Table 10-2 above, the aspheric coefficients A4, A6, A8, A10, A12, A14, and A16 are shown when the aspheric shape of each surface is represented by Mathematical Formula 1 above.

[0318] Here, in the wide-angle lens 1000, the radius of curvature of the object side lens surface of the sixth lens 160 (i.e., the twelfth surface 12) is -3.600 mm, and the radius of curvature of the image side lens surface of the sixth lens 160 (i.e., the thirteenth surface 13) is 0.963 mm, and thus the following Condition 1 is satisfied:

[0319] 0 < (R61+R62) / (R61-R62) < 1.000.

[0320] In Condition 1, if (R61+R62) / (R61-R62) is 0 or less, the sixth lens has a shape in which the radius of curvature of the image side lens surface is larger than the radius of curvature of the object side lens surface, and it is not possible to correct the coma, the field curvature, the lateral chromatic aberration, and the like of the sixth lens well; on the other hand, if (R61+R62) / (R61-R62) is 1.000 or more, it is not easy to correct the chromatic aberration well.

[0321] On the contrary, in the present embodiment, since Condition 1 is satisfied, there is an advantage that the coma, the field curvature, the lateral chromatic aberration, and the like of the sixth lens can be corrected well and the chromatic aberration can be corrected well.

[0322] In particular, in the present embodiment, since 0 < (R61+R62) / (R61-R62) < 0.750 is satisfied, there is an advantage that the coma, the field curvature, the lateral chromatic aberration, and the like of the sixth lens can be corrected even more well and the chromatic aberration can be corrected even more well.

[0323] Further, in the wide-angle lens 1000, the sagittal height Sag52 of the image-side lens surface of the fifth lens 150 is -0.513 mm, the effective radius sd52 of the image-side lens surface of the fifth lens 150 is 1.500 mm, the sagittal height Sag61 of the object-side lens surface of the sixth lens 160 is -0.259 mm, and the effective radius sd61 of the object-side lens surface of the sixth lens 160 is 1.250, and thus the following condition 2 is satisfied:

[0324] 1.000 < (Sag52 / sd52) / (Sag61 / sd61) < 3.000.

[0325] In the condition 2, if (Sag52 / sd52) / (Sag61 / sd61) is 1.000 or less, the radius of curvature of the image-side lens surface of the fifth lens 150 is smaller than the radius of curvature of the object-side lens surface of the sixth lens 160, the fifth lens 150 and the sixth lens 160 are not easily approached, the positioning accuracy of the fifth lens 150 or the sixth lens 160, the interval of the fifth lens 150 and the sixth lens 160, and the thickness accuracy of the fifth lens 150 and the sixth lens 160 become too high, and the assembly of the product is not easily performed; on the other hand, if (Sag52 / sd52) / (Sag61 / sd61) is 3.000 or more, various aberrations are not easily corrected well.

[0326] On the contrary, in the present embodiment, since the condition 2 is satisfied, there are advantages that the assembly of the product is easily performed and various aberrations are well corrected.

[0327] In particular, in the present embodiment, since the relationship of 1.400 < (Sag52 / sd52) / (Sag61 / sd61) < 2.500 is satisfied, there are advantages that the assembly of the product is more easily performed and various aberrations are more well corrected.

[0328] Further, in the wide-angle lens 1000, the ratio of the thickness T7 of the seventh lens 170 to the flange thickness C7 of the outer periphery of the seventh lens 170 is 2.865, and thus the following condition 3 is satisfied:

[0329] 2.000 < T7 / C7 < 3.500.

[0330] In the condition 3, if T7 / C7 is 2.000 or less, the convex lens surface of the seventh lens cannot be greatly projected, and it is difficult to effectively reduce aberrations such as chromatic aberration; on the other hand, if T7 / C7 is 3.500 or more, it is difficult to limit the distance in the optical axis direction between the gate provided on the side surface of the flange portion of the seventh lens and the top of the convex lens surface when resin molding of the seventh lens is performed using a mold, it is difficult to appropriately transmit the injection pressure at the time of resin molding to the top of the convex lens surface, and a fine recess caused by shrinkage of resin or the like is likely to occur at the top of the convex lens surface.

[0331] On the contrary, in the present embodiment, since the condition 3 is satisfied, there are advantages that aberrations such as chromatic aberration can be effectively reduced and a fine recess caused by shrinkage of resin or the like is less likely to occur at the top of the convex lens surface.

[0332] In particular, in the present embodiment, the relationship 2.300 < T7 / C7 < 3.200 is satisfied, and thus there are advantages that aberrations such as chromatic aberration can be more effectively reduced and a fine recess caused by shrinkage of resin or the like is less likely to occur at the top of the convex lens surface.

[0333] Further, in the wide-angle lens 1000, the ratio of the effective radius sd71 of the object side lens surface of the seventh lens 170 to the flange thickness C7 of the outer periphery of the seventh lens 170 is 1.409, and thus the following condition 4 is satisfied:

[0334] 1.100 < sd71 / C7 < 1.800.

[0335] In the condition 4, if sd71 / C7 is 1.100 or less, the convex lens surface of the seventh lens cannot be greatly projected, and it is difficult to effectively reduce aberrations such as chromatic aberration; on the other hand, if sd71 / C7 is 1.800 or more, it is difficult to limit the distance in the optical axis direction between the gate provided on the side surface of the flange portion of the seventh lens and the top of the convex lens surface when resin molding of the seventh lens is performed using a mold, it is difficult to appropriately transmit the injection pressure at the time of resin molding to the top of the convex lens surface, and a fine recess caused by shrinkage of resin or the like is likely to occur at the top of the convex lens surface.

[0336] On the contrary, in the present embodiment, since the condition 4 is satisfied, there are advantages that aberrations such as chromatic aberration can be effectively reduced and a fine recess caused by shrinkage of resin or the like is less likely to occur at the top of the convex lens surface.

[0337] In particular, in the present embodiment, the relationship 1.200 < sd71 / C7 < 1.600 is satisfied, and thus there are advantages that aberrations such as chromatic aberration can be more effectively reduced and a fine recess caused by shrinkage of resin or the like is less likely to occur at the top of the convex lens surface.

[0338] Further, in the wide-angle lens 1000, the sixth lens 160 and the seventh lens 170 are bonded together by an adhesive layer, the refractive index n6 of the sixth lens 160 is 1.635, the refractive index n0 of the adhesive layer is 1.486, and the refractive index n7 of the seventh lens 170 is 1.544, and thus the following condition 5 is satisfied:

[0339] |n6-n0| > |n7-n0|.

[0340] In the resin molding of the seventh lens using a mold, even if a slight concave portion is generated at the top of the convex lens surface due to shrinkage of the resin or the like, the adhesive layer can fill the above-mentioned concave portion at the time of forming the bonded lens, and in the case where the condition 5 is satisfied, the refractive index n0 of the adhesive layer is closer to the refractive index n7 of the seventh lens than the refractive index n6 of the sixth lens, and thus the adhesive layer filled in the above-mentioned concave portion can function as a part of the convex lens surface of the seventh lens, whereby the optical characteristics of the wide-angle lens are less likely to be reduced.

[0341] Further, in the wide-angle lens 1000, the composite focal distance f67 of the sixth lens 160 and the seventh lens 170 is 10.463 mm, and the focal distance f of the entire wide-angle lens is 1.019 mm, and thus the following condition 7 is satisfied:

[0342] 6.000 < f67 / f < 13.500.

[0343] In the present embodiment, since the condition 7 is satisfied, chromatic aberration can be appropriately corrected.

[0344] In particular, in the present embodiment, the relationship 8.000 < f67 / f < 12.000 is satisfied, and thus chromatic aberration can be more appropriately corrected.

[0345] Further, in the wide-angle lens 1000, the radius of curvature R71 of the object side lens surface of the seventh lens 170 is 0.963 mm, and the focal distance f of the entire wide-angle lens is 1.019 mm, and thus the following condition 8 is satisfied:

[0346] 0.800 < R71 / f < 1.200.

[0347] In the condition 8, if R71 / f is 0.800 or less, the radius of curvature of the bonding surface of the sixth lens 160 and the seventh lens 170 is too small, the sixth lens 160 and the seventh lens 170 are not easily formed, and the generation of spherical aberration is not easily suppressed; on the other hand, if R71 / f is 1.200 or more, various aberrations (particularly, chromatic aberration) are not easily appropriately corrected, and excellent optical characteristics are not easily achieved.

[0348] On the contrary, in the present embodiment, since the condition 8 is satisfied, there is an advantage that it is possible to achieve excellent optical characteristics while suppressing the generation of spherical aberration and appropriately correcting various aberrations (particularly, chromatic aberration).

[0349] Further, in the wide-angle lens 1000, the object-image distance d is 13.381 mm, the focal distance f of the entire lens system is 1.019 mm, and thus the following condition 9 is satisfied:

[0350] 11.000 < d / f < 15.000

[0351] In the condition 9, 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.

[0352] On the contrary, in the present embodiment, since the condition 9 is satisfied, it is easy to appropriately correct various aberrations, it is easy to achieve 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.

[0353] As described above, in the present embodiment, by configuring the wide-angle lens 1000 in the above-described manner, as shown in FIG. 17, it is possible to appropriately correct the coma, the field curvature, the magnification chromatic aberration, and the like of the sixth lens, and it is possible to appropriately correct the chromatic aberration. ​

[0354] (Embodiment 6)

[0355] ​ is a diagram illustrating the wide-angle lens of Embodiment 6 of the present application, ​ is a diagram illustrating the field curvature and the distortion of the wide-angle lens of Embodiment 6 of the present application, ​ is a diagram illustrating the field curvature and the distortion of the wide-angle lens of Embodiment 6 of the present application, ​ is a diagram illustrating the sagittal chromatic aberration (lateral chromatic aberration) of the wide-angle lens of Embodiment 6 of the present application, ​ is a diagram illustrating the spherical aberration (longitudinal chromatic aberration) of the wide-angle lens of Embodiment 6 of the present application, ​ is a diagram illustrating the lateral chromatic aberration of the wide-angle lens of Embodiment 6 of the present application. Here, in ​ , ​ , ​ , ​ , ​ in FIGS. 18 to 21, 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 ​ ​In the figure, the maximum scale of the vertical axis is ±50.000 μm.

[0356] like ​ 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.

[0357] 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.

[0358] In addition, such as ​ As shown, similar to 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 imaging element 300 is disposed on the image side of the filter 200. Furthermore, similar to Embodiment 1, the sixth lens 160 and the seventh lens 170 are bonded together by an adhesive layer with a refractive index of 1.486 (i.e., an adhesive with a refractive index of 1.486 is used).

[0359] 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.

[0360] Table 11 shows the physical properties of each facet of the wide-angle lens 1000 of this embodiment, and Tables 12-1 and 12-2 show the aspherical coefficients of each facet of the wide-angle lens 1000 of this embodiment.

[0361] (Table 11)

[0362]

[0363] In Table 11 above, the units of the radius of curvature, the thickness, the back focal distance, the effective radius, and the sag are mm, Nd is the refractive index for a light ray of 587.56 nm, and * indicates an aspheric surface.

[0364] (Table 12-1)

[0365]

[0366] (Table 12-2)

[0367] ​ 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

[0368] 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.

[0369] Further, in Table 12-1 and Table 12-2 above, the aspheric coefficients A4, A6, A8, A10, A12, A14, and A16 are shown when the aspheric shape of each surface is represented by Mathematical Formula 1 above.

[0370] Here, in the wide-angle lens 1000, the radius of curvature of the object side lens surface (i.e., the twelfth surface 12) of the sixth lens 160 is -3.864 mm, and the radius of curvature of the image side lens surface (i.e., the thirteenth surface 13) of the sixth lens 160 is 0.980 mm, and thus, the following Condition 1 is satisfied:

[0371] 0 < (R61+R62) / (R61-R62) < 1.000.

[0372] In Condition 1, if (R61+R62) / (R61-R62) is 0 or less, the sixth lens has a shape in which the radius of curvature of the image side lens surface is larger than the radius of curvature of the object side lens surface, and it is not possible to correct the coma, the field curvature, the lateral chromatic aberration, and the like of the sixth lens well; on the other hand, if (R61+R62) / (R61-R62) is 1.000 or more, it is not easy to correct the chromatic aberration well.

[0373] On the contrary, in the present embodiment, since Condition 1 is satisfied, there is an advantage that the coma, the field curvature, the lateral chromatic aberration, and the like of the sixth lens can be corrected well and the chromatic aberration can be corrected well.

[0374] In particular, in the present embodiment, since 0 < (R61+R62) / (R61-R62) < 0.750 is satisfied, there is an advantage that the coma, the field curvature, the lateral chromatic aberration, and the like of the sixth lens can be corrected even more well and the chromatic aberration can be corrected even more well.

[0375] Further, in the wide-angle lens 1000, the sagittal height Sag52 of the image-side lens surface of the fifth lens 150 is -0.481 mm, the effective radius sd52 of the image-side lens surface of the fifth lens 150 is 1.500 mm, the sagittal height Sag61 of the object-side lens surface of the sixth lens 160 is -0.300 mm, and the effective radius sd61 of the object-side lens surface of the sixth lens 160 is 1.326, and thus the following condition 2 is satisfied:

[0376] 1.000 < (Sag52 / sd52) / (Sag61 / sd61) < 3.000.

[0377] In the condition 2, if (Sag52 / sd52) / (Sag61 / sd61) is 1.000 or less, the radius of curvature of the image-side lens surface of the fifth lens 150 is smaller than the radius of curvature of the object-side lens surface of the sixth lens 160, the fifth lens 150 and the sixth lens 160 are not easily approached, the positioning accuracy of the fifth lens 150 or the sixth lens 160, the interval of the fifth lens 150 and the sixth lens 160, and the thickness accuracy of the fifth lens 150 and the sixth lens 160 become too high, and the assembly of the product is not easily performed; on the other hand, if (Sag52 / sd52) / (Sag61 / sd61) is 3.000 or more, various aberrations are not easily corrected well.

[0378] In contrast, in the present embodiment, since the condition 2 is satisfied, there are advantages that the assembly of the product is easily performed and various aberrations are well corrected.

[0379] In particular, in the present embodiment, since the relationship of 1.400 < (Sag52 / sd52) / (Sag61 / sd61) < 2.500 is satisfied, there are advantages that the assembly of the product is more easily performed and various aberrations are more well corrected.

[0380] Further, in the wide-angle lens 1000, the ratio of the thickness T7 of the seventh lens 170 to the flange thickness C7 of the outer periphery of the seventh lens 170 is 2.937, and thus the following condition 3 is satisfied:

[0381] 2.000 < T7 / C7 < 3.500.

[0382] In the condition 3, if T7 / C7 is 2.000 or less, the convex lens surface of the seventh lens cannot be greatly projected, and it is difficult to effectively reduce aberrations such as chromatic aberration; on the other hand, if T7 / C7 is 3.500 or more, it is difficult to limit the distance in the optical axis direction between the gate provided on the side surface of the flange portion of the seventh lens and the top of the convex lens surface when resin molding of the seventh lens is performed using a mold, it is difficult to appropriately transmit the injection pressure at the time of resin molding to the top of the convex lens surface, and a fine recess caused by shrinkage of resin or the like is likely to occur at the top of the convex lens surface.

[0383] On the contrary, in the present embodiment, since the condition 3 is satisfied, there is an advantage that it is possible to effectively reduce aberrations such as chromatic aberration and a fine recess caused by shrinkage of resin or the like is less likely to occur at the top of the convex lens surface.

[0384] In particular, in the present embodiment, the relationship 2.300 < T7 / C7 < 3.200 is satisfied, and thus there is an advantage that it is possible to more effectively reduce aberrations such as chromatic aberration and a fine recess caused by shrinkage of resin or the like is less likely to occur at the top of the convex lens surface.

[0385] Further, in the wide-angle lens 1000, the ratio of the effective radius sd71 of the object side lens surface of the seventh lens 170 to the flange thickness C7 of the outer periphery of the seventh lens 170 is 1.441, and thus the following condition 4 is satisfied:

[0386] 1.100 < sd71 / C7 < 1.800.

[0387] In the condition 4, if sd71 / C7 is 1.100 or less, the convex lens surface of the seventh lens cannot be greatly projected, and it is difficult to effectively reduce aberrations such as chromatic aberration; on the other hand, if sd71 / C7 is 1.800 or more, it is difficult to limit the distance in the optical axis direction between the gate provided on the side surface of the flange portion of the seventh lens and the top of the convex lens surface when resin molding of the seventh lens is performed using a mold, it is difficult to appropriately transmit the injection pressure at the time of resin molding to the top of the convex lens surface, and a fine recess caused by shrinkage of resin or the like is likely to occur at the top of the convex lens surface.

[0388] On the contrary, in the present embodiment, since the condition 4 is satisfied, there is an advantage that it is possible to effectively reduce aberrations such as chromatic aberration and a fine recess caused by shrinkage of resin or the like is less likely to occur at the top of the convex lens surface.

[0389] In particular, in the present embodiment, the relationship 1.200 < sd71 / C7 < 1.600 is satisfied, and thus there is an advantage that it is possible to more effectively reduce aberrations such as chromatic aberration and a fine recess caused by shrinkage of resin or the like is less likely to occur at the top of the convex lens surface.

[0390] Further, in the wide-angle lens 1000, the sixth lens 160 and the seventh lens 170 are bonded together by an adhesive layer, the refractive index n6 of the sixth lens 160 is 1.635, the refractive index n0 of the adhesive layer is 1.486, and the refractive index n7 of the seventh lens 170 is 1.544, and thus the following condition 5 is satisfied:

[0391] |n6-n0| > |n7-n0|.

[0392] In the resin molding of the seventh lens using a mold, even if a slight concave portion is generated at the top of the convex lens surface due to shrinkage of the resin or the like, the adhesive layer can fill the above-mentioned concave portion when the cemented lens is formed, and in the case where the condition 5 is satisfied, the refractive index n0 of the adhesive layer is closer to the refractive index n7 of the seventh lens than the refractive index n6 of the sixth lens, and thus the adhesive layer filled in the above-mentioned concave portion can function as a part of the convex lens surface of the seventh lens, whereby the optical characteristics of the wide-angle lens are less likely to be reduced.

[0393] Further, in the wide-angle lens 1000, the combined focal distance f67 of the sixth lens 160 and the seventh lens 170 is 10.147 mm, and the focal distance f of the entire wide-angle lens is 1.019 mm, and thus the following condition 7 is satisfied:

[0394] 6.000 < f67 / f < 13.500.

[0395] In the present embodiment, since the condition 7 is satisfied, chromatic aberration can be appropriately corrected.

[0396] In particular, in the present embodiment, the relationship 8.000 < f67 / f < 12.000 is satisfied, and thus chromatic aberration can be more appropriately corrected.

[0397] Further, in the wide-angle lens 1000, the radius of curvature R71 of the object side lens surface of the seventh lens 170 is 0.980 mm, and the focal distance f of the entire wide-angle lens is 1.019 mm, and thus the following condition 8 is satisfied:

[0398] 0.800 < R71 / f < 1.200.

[0399] In the condition 8, if R71 / f is 0.800 or less, the radius of curvature of the joint surface of the sixth lens 160 and the seventh lens 170 is too small, the sixth lens 160 and the seventh lens 170 are not easily formed, and the generation of spherical aberration is not easily suppressed; on the other hand, if R71 / f is 1.200 or more, various aberrations (particularly, chromatic aberration) are not easily appropriately corrected, and excellent optical characteristics are not easily achieved.

[0400] On the contrary, in the present embodiment, since the condition 8 is satisfied, there is an advantage that it is possible to inhibit generation of spherical aberration and to appropriately correct various aberrations (particularly, chromatic aberration), and to achieve excellent optical characteristics.

[0401] Further, in the wide-angle lens 1000, the object-image distance d is 13.397 mm, and the focal distance f of the entire lens system is 1.019 mm, and thus the following condition 9 is satisfied:

[0402] 11.000 < d / f < 15.000

[0403] In the condition 9, 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.

[0404] On the contrary, in the present embodiment, since the condition 9 is satisfied, it is easy to appropriately correct various aberrations, it is easy to obtain excellent optical characteristics, and it is possible to inhibit the entire lens system from becoming too large while avoiding the length of the entire lens system from becoming too long.

[0405] 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 appropriately correct the coma, the field curvature, the magnification chromatic aberration, and the like of the sixth lens, and it is possible to appropriately correct the chromatic aberration. ​

[0406] The present application has been described above with reference to the drawings, but the specific implementation of the present application is not limited to the above-described embodiments.

[0407] For example, in the above-described 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.

[0408] Further, in the above-described embodiments, the first lens 110 and the fifth lens 150 can also be configured by 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 configured by glass lenses.​

Claims

1. A wide-angle lens, characterized in that, It includes a first lens, a second lens, a third lens, a fourth lens, an aperture, a fifth lens, a sixth lens, and a seventh lens arranged sequentially from the object side. The first lens is a negative lens, the second lens is a negative lens, the third lens is a positive lens, the fourth lens is a positive lens, the fifth lens is a positive lens, the sixth lens is a negative lens, and the seventh lens is a positive lens. The sixth lens and the seventh lens constitute a combined lens. The image-side lens surface of the fifth lens is convex. When the radius of curvature of the object-side lens surface of the sixth lens is set to R61 and the radius of curvature of the image-side lens surface of the sixth lens is set to R62, The following relationship must be satisfied: 0<(R61+R62) / (R61-R62)<1.000, When the image-side lens surface elevation of the fifth lens is set to Sag52, the effective radius of the image-side lens surface of the fifth lens is set to sd52, and the object-side lens surface elevation of the sixth lens is set to Sag61 and the effective radius of the object-side lens surface of the sixth lens is set to sd61, the following relationship is satisfied: 1.000<(Sag52 / sd52) / (Sag61 / sd61)<3.

000.

2. The wide-angle lens as described in claim 1, characterized in that, The following relationship is satisfied: 0 < (R61 + R62) / (R61 - R62) < 0.

750.

3. The wide-angle lens as described in claim 1, characterized in that, The following relationship must be satisfied: 1.400<(Sag52 / sd52) / (Sag61 / sd61)<2.

500.

4. The wide-angle lens as described in claim 1, characterized in that, The sixth lens and the seventh lens are both plastic lenses. When the thickness at the optical axis of the seventh lens is set to T7 and the flange thickness of the outer periphery of the seventh lens is set to C7, the following relationship is satisfied: 2.000 < T7 / C7 < 3.

500.

5. The wide-angle lens as described in claim 4, characterized in that, The following relationship must be satisfied: 2.300 < T7 / C7 < 3.

200.

6. The wide-angle lens as described in claim 4, characterized in that, When the effective radius of the object-side lens surface of the seventh lens is set to sd71, the following relationship is satisfied: 1.100 < sd71 / C7 < 1.

800.

7. The wide-angle lens as described in claim 6, characterized in that, The following relationship must be satisfied: 1.200 < sd71 / C7 < 1.

600.

8. The wide-angle lens as described in claim 1, characterized in that, The sixth lens and the seventh lens are bonded together by an adhesive layer. When the refractive index of the sixth lens is set to n6, the refractive index of the adhesive layer is set to n0, and the refractive index of the seventh lens is set to n7, the following relationship is satisfied: |n6-n0|>|n7-n0|.

9. The wide-angle lens as described in claim 1, characterized in that, When the combined focal distance of the sixth and seventh lenses is set to f67 and the focal distance of the entire wide-angle lens is set to f, the following relationship is satisfied: 6.000 < f67 / f < 13.

500.

10. The wide-angle lens as described in claim 9, characterized in that, The following relationship must be satisfied: 8.000 < f67 / f < 12.

000.

11. The wide-angle lens as described in claim 1, characterized in that, When the radius of curvature of the object-side lens surface of the seventh lens is set to R71 and the focal distance of the entire wide-angle lens is set to f, the following relationship is satisfied: 0.800 < R71 / f < 1.

200.

12. The wide-angle lens as described in claim 1, characterized in that, The first lens is a negative lens with a concave image-side lens surface. The second lens is a negative lens with a concave image-side lens surface. The third lens is a positive lens with a convex image-side lens surface. The fourth lens is a positive lens with a convex image-side lens surface. The fifth lens is a positive lens with a convex object-side lens surface and a convex image-side lens surface. The sixth lens is a negative lens with a concave image-side lens surface. The seventh lens is a positive lens with a convex object-side lens surface and a convex image-side lens surface.

13. 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.

Images