CN112987237A - Wide-angle lens - Google Patents
Wide-angle lens Download PDFInfo
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- CN112987237A CN112987237A CN201911281315.7A CN201911281315A CN112987237A CN 112987237 A CN112987237 A CN 112987237A CN 201911281315 A CN201911281315 A CN 201911281315A CN 112987237 A CN112987237 A CN 112987237A
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- 230000004075 alteration Effects 0.000 abstract description 264
- 206010010071 Coma Diseases 0.000 abstract description 48
- 230000003287 optical effect Effects 0.000 description 53
- 238000010586 diagram Methods 0.000 description 8
- 239000000853 adhesive Substances 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 6
- 238000003384 imaging method Methods 0.000 description 6
- 235000012149 noodles Nutrition 0.000 description 6
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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Abstract
A wide-angle lens is provided, which can easily correct various aberrations such as curvature of field, chromatic aberration of magnification, coma aberration, etc., and can easily realize miniaturization of the whole wide-angle lens. A wide-angle lens according to the present invention includes, in order from an object side, a first lens, a second lens, a third lens, a fourth lens, a stop, a fifth lens, a sixth lens, and a seventh lens, wherein the first lens is a negative lens having a concave image-side lens surface, the second lens is a negative lens having a concave image-side lens surface, the third lens is a positive lens having a convex image-side lens surface, the fourth lens is a positive lens having a convex image-side lens surface, the fifth lens is a positive lens, the sixth lens is a negative lens, the seventh lens is a positive lens, and when a focal distance of the third lens is f3 and a focal distance of the entire wide-angle lens is f, the following relationships are satisfied: 3.000 < f3/f < 12.500.
Description
Technical Field
The present invention relates to a wide-angle lens.
Background
As a wide-angle lens for an in-vehicle camera, there has been conventionally known a wide-angle lens including a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, and a seventh lens, which are arranged in this order from an object side (see, for example, patent document 1).
Patent document 1: japanese patent laid-open publication No. 2018-60153
In practice, in order to achieve good optical characteristics, it is desirable to easily correct various aberrations such as curvature of field, chromatic aberration of magnification, and coma aberration of the wide-angle lens, and on the other hand, there is a case where the overall size of a space for installing the wide-angle lens in a vehicle is limited, and therefore, it is desirable to achieve miniaturization of the wide-angle lens as a whole.
Disclosure of Invention
The present invention has been made in view of the above problems, and an object of the present invention is to provide a wide-angle lens in which various aberrations such as curvature of field, chromatic aberration of magnification, and coma are easily corrected appropriately, and in which the entire wide-angle lens is easily downsized.
In order to achieve the above object, the present invention provides a wide-angle lens including, in order from an object side, a first lens, a second lens, a third lens, a fourth lens, a stop, a fifth lens, a sixth lens, and a seventh lens, wherein the first lens is a negative lens having a concave image-side lens surface, the second lens is a negative lens having a concave image-side lens surface, the third lens is a positive lens having a convex image-side lens surface, the fourth lens is a positive lens having a convex image-side lens surface, the fifth lens is a positive lens, the sixth lens is a negative lens, the seventh lens is a positive lens, and when a focal distance of the third lens is f3 and a focal distance of the entire wide-angle lens is f, the following relationships are satisfied: 3.000 < f3/f < 12.500.
According to the wide-angle lens of the present invention, since the relationship of f3/f > 3.000 is satisfied, the positive optical power of the third lens can be prevented from being excessively strong, and thus various aberrations such as curvature of field, chromatic aberration of magnification, and coma can be easily and appropriately corrected, and excellent optical characteristics can be realized; on the other hand, the relationship of f3/f < 12.500 is satisfied, so that the lens diameter and the distance between the object images can be reduced, and the whole wide-angle lens can be miniaturized; further, since the third lens and the fourth lens are both positive lenses, the negative focal powers of the first lens and the second lens can be increased, and therefore the diameters of the first lens and the second lens can be reduced, and the entire wide-angle lens can be more easily downsized.
Further, in the wide-angle lens of the present invention, it is preferable that the following relationship is satisfied: 5.000 < f3/f < 10.000.
According to the wide-angle lens of the present invention, since the relationship of 5.000 < f3/f < 10.000 is satisfied, it is possible to more easily and appropriately correct various aberrations such as curvature of field, chromatic aberration of magnification, coma aberration, and the like, and to realize excellent optical characteristics, and it is possible to further reduce the lens diameter and the inter-object distance, and to realize miniaturization of the entire wide-angle lens.
In the wide-angle lens of the present invention, it is preferable that the following relationship is satisfied when the focal length of the fourth lens is f 4: 4.000 < f4/f < 7.000.
According to the wide-angle lens of the present invention, since the relationship of f4/f > 4.000 is satisfied, it is possible to avoid the positive optical power from being excessively strong, and thereby, it is easy to appropriately correct various aberrations such as curvature of field, chromatic aberration of magnification, coma aberration, and the like, and it is possible to realize excellent optical characteristics; on the other hand, since the relationship of f4/f < 7.000 is satisfied, the lens diameter and the distance between the object images can be reduced, and the wide-angle lens can be miniaturized as a whole.
Further, in the wide-angle lens of the present invention, it is preferable that the following relationship is satisfied: 4.500 < f4/f < 6.000.
According to the wide-angle lens of the present invention, since the relationship of 4.500 < f4/f < 6.000 is satisfied, it is possible to more easily and appropriately correct various aberrations such as curvature of field, chromatic aberration of magnification, coma aberration, and the like, and to realize excellent optical characteristics, and it is possible to further reduce the lens diameter and the inter-object distance, and to realize miniaturization of the entire wide-angle lens.
In the wide-angle lens according to the present invention, it is preferable that the following relationship is satisfied when the radius of curvature of the object-side lens surface of the fourth lens is R41: 10.000 < | R41/f | < 40.000.
According to the wide-angle lens of the present invention, since | R41/f | > 10.000 is satisfied, the radius of curvature of the object-side lens surface of the fourth lens is large, and even if light reaching the image pickup element is reflected on the surface of the image pickup element and enters the fourth lens, the entered light is not easily reflected on the object-side lens surface of the fourth lens and is not easily returned to the image pickup element, and thus ghost can be suppressed; further, the relationship of | R41/f | < 40.000 is satisfied, and therefore, the refractive power of the fourth lens can be secured to be large, and thus, various aberrations can be easily and appropriately corrected, and excellent optical characteristics can be realized.
Further, in the wide-angle lens of the present invention, it is preferable that the following relationship is satisfied: 13.000 < | R41/f | < 30.000.
According to the wide-angle lens of the present invention, since the relationship of 13.000 < | R41/f | < 30.000 is satisfied, it is possible to further suppress ghost and to more easily and appropriately correct various aberrations, thereby realizing excellent optical characteristics.
In the wide-angle lens according to the present invention, it is preferable that the fourth lens is a positive lens having a concave object-side lens surface and a convex image-side lens surface, and that a curvature radius of the object-side lens surface of the fourth lens is R41, where the fourth lens satisfies the following relationship: -30.000 < R41/f < -10.000.
According to the wide-angle lens of the present invention, since the relationship of R41/f > -30.000 is satisfied, the negative power of the object-side lens surface of the fourth lens can be secured to be large, and thus, various aberrations can be easily and appropriately corrected, and excellent optical characteristics can be realized; on the other hand, since the relationship of R41/f < -10.000 is satisfied, the curvature radius of the object side lens surface of the fourth lens is not excessively small, and even if light reaching the image pickup element is reflected on the surface of the image pickup element and enters the fourth lens, the entered light is not easily reflected on the object side lens surface of the fourth lens and is not easily returned to the image pickup element, whereby ghost can be suppressed.
Further, in the wide-angle lens of the present invention, it is preferable that the following relationship is satisfied: -25.000 < R41/f < -12.000.
According to the wide-angle lens of the present invention, the relationship of-25.000 < R41/f < -12.000 is satisfied, and therefore, various aberrations can be more easily and appropriately corrected, excellent optical characteristics can be realized, and ghost can be more suppressed.
In the wide-angle lens according to the present invention, it is preferable that the sixth lens and the seventh lens constitute a cemented lens, the fifth lens is a positive lens having a convex object-side lens surface and a convex image-side lens surface, the sixth lens is a negative lens having a concave image-side lens surface, the seventh lens is a positive lens having a convex object-side lens surface and a convex image-side lens surface, and the following relationship is satisfied when a combined focal distance of the first lens, the second lens, the third lens, and the fourth lens is f1234 and a combined focal distance of the fifth lens, the sixth lens, and the seventh lens is f 567: f1234/f567 is more than 0.800 and less than 8.000.
According to the wide angle lens of the present invention, since the relationship of f1234/f567 > 0.800 is satisfied, it is possible to avoid an excessive optical power of the front lens group composed of the first lens, the second lens, the third lens and the fourth lens, thereby facilitating appropriate correction of various aberrations and easily obtaining excellent optical characteristics; on the other hand, since the relationship of f1234/f567 < 8.000 is satisfied, the power of the front lens group including the first lens, the second lens, the third lens, and the fourth lens can be prevented from being too weak, and thus the diameter of each lens of the front lens group can be reduced, and the entire lens system can be easily downsized.
In the wide-angle lens according to the present invention, it is preferable that the sixth lens and the seventh lens constitute a cemented lens, the fifth lens is a positive lens having a convex object-side lens surface and a convex image-side lens surface, the sixth lens is a negative lens having a concave image-side lens surface, the seventh lens is a positive lens having a convex object-side lens surface and a convex image-side lens surface, and the following relationship is satisfied when a combined focal distance of the fifth lens, the sixth lens, and the seventh lens is f567 and a focal distance of the entire wide-angle lens is f: f567/f is more than 2.800 and less than 3.850.
According to the wide angle lens of the present invention, since the relationship of f567/f > 2.800 is satisfied, the optical power of the rear lens group constituted by the fifth lens, the sixth lens and the seventh lens can be prevented from being excessively strong, and thus, various aberrations, particularly chromatic aberration, can be easily corrected appropriately, and excellent optical characteristics can be easily obtained; on the other hand, since the relationship of f567/f < 3.850 is satisfied, the diameter of each lens and the distance between the object images can be reduced, and the wide-angle lens can be further downsized as a whole.
In the wide-angle lens of the present invention, it is preferable that the following relationship is satisfied when d is an inter-object distance of the wide-angle lens and f is a focal length of the wide-angle lens as a whole: 11.000 < d/f < 15.000.
According to the wide-angle lens of the present invention, the relationship of d/f > 11.000 is satisfied, and therefore, various aberrations are easily corrected appropriately, and excellent optical characteristics are easily obtained; on the other hand, the relationship of d/f < 15.000 is satisfied, and therefore, the length of the entire lens system can be prevented from becoming too long, and the lens system can be prevented from becoming too large.
In the wide-angle lens of the present invention, it is preferable that the first lens and the fifth lens are each a glass lens, and the second lens, the third lens, the fourth lens, the sixth lens, and the seventh lens are each a plastic lens.
(effect of the invention)
According to the present invention, since the relationship of f3/f > 3.000 is satisfied when the focal length of the third lens is f3 and the focal length of the entire wide-angle lens is f, it is possible to avoid an excessively strong positive optical power of the third lens, and thereby, it is easy to appropriately correct various aberrations such as curvature of field, chromatic aberration of magnification, and coma aberration, and excellent optical characteristics can be realized; on the other hand, the relationship of f3/f < 12.500 is satisfied, so that the lens diameter and the distance between the object images can be reduced, and the whole wide-angle lens can be miniaturized; further, since the third lens and the fourth lens are both positive lenses, the negative focal powers of the first lens and the second lens can be increased, and therefore the diameters of the first lens and the second lens can be reduced, and the entire wide-angle lens can be more easily downsized.
Drawings
Fig. 1 is an explanatory view showing a wide-angle lens according to embodiment 1 of the present invention.
Fig. 2A is an explanatory view showing curvature of field and distortion of the wide-angle lens according to embodiment 1 of the present invention.
Fig. 2B is an explanatory view showing curvature of field and distortion of the wide-angle lens according to embodiment 1 of the present invention.
Fig. 3A is an explanatory view showing the vertical axis chromatic aberration (lateral chromatic aberration) of the wide-angle lens according to embodiment 1 of the present invention.
Fig. 3B is an explanatory diagram showing spherical aberration (longitudinal aberration) of the wide-angle lens according to embodiment 1 of the present invention.
Fig. 4A to 4L are explanatory views showing lateral aberrations of the wide-angle lens according to embodiment 1 of the present invention.
Fig. 5 is an explanatory view showing a wide-angle lens according to embodiment 2 of the present invention.
Fig. 6A is an explanatory view showing curvature of field and distortion of the wide-angle lens according to embodiment 2 of the present invention.
Fig. 6B is an explanatory view showing curvature of field and distortion of the wide-angle lens according to embodiment 2 of the present invention.
Fig. 7A is an explanatory view showing the vertical axis chromatic aberration (lateral chromatic aberration) of the wide-angle lens according to embodiment 2 of the present invention.
Fig. 7B is an explanatory diagram showing spherical aberration (longitudinal aberration) of the wide-angle lens according to embodiment 2 of the present invention.
Fig. 8A to 8L are explanatory views showing lateral aberrations of the wide-angle lens according to embodiment 2 of the present invention.
Fig. 9 is an explanatory view showing a wide-angle lens according to embodiment 3 of the present invention.
Fig. 10A is an explanatory view showing curvature of field and distortion of the wide-angle lens according to embodiment 3 of the present invention.
Fig. 10B is an explanatory view showing curvature of field and distortion of the wide-angle lens according to embodiment 3 of the present invention.
Fig. 11A is an explanatory view showing the vertical axis chromatic aberration (lateral chromatic aberration) of the wide-angle lens according to embodiment 3 of the present invention.
Fig. 11B is an explanatory diagram showing spherical aberration (longitudinal aberration) of the wide-angle lens according to embodiment 3 of the present invention.
Fig. 12A to 12L are explanatory views showing lateral aberrations of the wide-angle lens according to embodiment 3 of the present invention.
Fig. 13 is an explanatory view showing a wide-angle lens according to embodiment 4 of the present invention.
Fig. 14A is an explanatory view showing curvature of field and distortion of the wide-angle lens according to embodiment 4 of the present invention.
Fig. 14B is an explanatory view showing curvature of field and distortion of the wide-angle lens according to embodiment 4 of the present invention.
Fig. 15A is an explanatory view showing the vertical axis chromatic aberration (lateral chromatic aberration) of the wide-angle lens according to embodiment 4 of the present invention.
Fig. 15B is an explanatory diagram showing spherical aberration (longitudinal aberration) of the wide-angle lens according to embodiment 4 of the present invention.
Fig. 16A to 16L are explanatory views showing lateral aberrations of the wide-angle lens according to embodiment 4 of the present invention.
Fig. 17 is an explanatory view showing a wide-angle lens according to embodiment 5 of the present invention.
Fig. 18A is an explanatory view showing curvature of field and distortion of the wide-angle lens according to embodiment 5 of the present invention.
Fig. 18B is an explanatory diagram showing curvature of field and distortion of the wide-angle lens according to embodiment 5 of the present invention.
Fig. 19A is an explanatory view showing the vertical axis chromatic aberration (lateral chromatic aberration) of the wide-angle lens according to embodiment 5 of the present invention.
Fig. 19B is an explanatory diagram showing spherical aberration (longitudinal aberration) of the wide-angle lens according to embodiment 5 of the present invention.
Fig. 20A to 20L are explanatory views showing lateral aberrations of the wide-angle lens according to embodiment 5 of the present invention.
Fig. 21 is an explanatory view showing a wide-angle lens according to embodiment 6 of the present invention.
Fig. 22A is an explanatory view showing curvature of field and distortion of the wide-angle lens according to embodiment 6 of the present invention.
Fig. 22B is an explanatory diagram showing curvature of field and distortion of the wide-angle lens according to embodiment 6 of the present invention.
Fig. 23A is an explanatory view showing the vertical axis chromatic aberration (lateral chromatic aberration) of the wide-angle lens according to embodiment 6 of the present invention.
Fig. 23B is an explanatory diagram showing spherical aberration (longitudinal aberration) of the wide-angle lens according to embodiment 6 of the present invention.
Fig. 24A to 24L are explanatory views showing lateral aberrations of the wide-angle lens according to embodiment 6 of the present invention.
(symbol description)
1000 wide angle lens
110 first lens
120 second lens
130 third lens
140 fourth lens
150 fifth lens
160 sixth lens
170 seventh lens
180 aperture
190 light shielding sheet
200 filter
300 image pickup element
Detailed Description
Next, embodiments of the wide-angle lens according to the present invention will be described with reference to the drawings. In the following description, the object side is denoted by L1 and the object side is denoted by L2 in the extending direction of the optical axis L.
(embodiment mode 1)
Fig. 1 is an explanatory view showing a wide-angle lens according to embodiment 1 of the present invention, fig. 2A is an explanatory view showing field curvature and distortion of the wide-angle lens according to embodiment 1 of the present invention, fig. 2B is an explanatory view showing field curvature and distortion of the wide-angle lens according to embodiment 1 of the present invention, fig. 3A is an explanatory view showing vertical axis chromatic aberration (lateral chromatic aberration) of the wide-angle lens according to embodiment 1 of the present invention, fig. 3B is an explanatory view showing spherical aberration (longitudinal aberration) of the wide-angle lens according to embodiment 1 of the present invention, and fig. 4A to 4L are explanatory views showing lateral aberration of the wide-angle lens according to embodiment 1 of the present invention. Here, in fig. 2A, 2B, 3A, 3B, and 4A to 4L, R is indicated as a correlation curve of red light R (wavelength 656nm), G is indicated as a correlation curve of green light G (wavelength 588nm), B is indicated as a correlation curve of blue light B (wavelength 486nm), T is indicated as correlation with the meridian plane, S is indicated as correlation with the sagittal plane, and in fig. 4A to 4L, the Maximum dimension (Maximum Scale) of the vertical axis is ± 50.000 μm.
As shown in fig. 1, the wide-angle lens 1000 includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, an aperture stop 180, a fifth lens 150, a sixth lens 160, and a seventh lens 170, which are arranged in this order from the object side (L1 side), wherein the sixth lens 160 and the seventh lens 170 are bonded together with an adhesive agent to form a cemented lens.
Here, the first lens 110 is a lens having negative refractive power with a convex surface (first surface 1) facing the object side L1 and a concave surface (second surface 2) facing the image side L2 (hereinafter referred to as a negative lens). In the present embodiment, the first lens 110 is a glass lens in which the first surface 1 and the second surface 2 are spherical surfaces.
The second lens 120 is a lens having negative refractive power with a convex surface (third surface 3) facing the object side L1 and a concave surface (fourth surface 4) facing the image side L2. In the present embodiment, the second lens 120 is a plastic lens in which the third surface 3 and the fourth surface 4 are aspherical surfaces.
The third lens 130 is a lens having positive refractive power and a concave surface (fifth surface 5) facing the object side L1 and a convex surface (sixth surface 6) facing the image side L2 (hereinafter referred to as a positive lens). In the present embodiment, the third lens 130 is a plastic lens in which the fifth surface 5 and the sixth surface 6 are aspherical surfaces.
The fourth lens 140 is a lens having positive optical power with a concave surface (seventh surface 7) facing the object side L1 and a convex surface (eighth surface 8) facing the image side L2. In the present embodiment, the fourth lens 140 is a plastic lens in which the seventh surface 7 and the eighth surface 8 are aspherical surfaces.
The fifth lens 150 is a lens having positive refractive power with a convex surface (tenth surface 10) facing the object side L1 and a convex surface (eleventh surface 11) facing the image side L2. In the present embodiment, the fifth lens 150 is formed of a glass lens.
The sixth lens 160 is a lens having negative optical power with a concave surface (the twelfth surface 12) facing the object side L1 and a concave surface (the thirteenth surface 13) facing the image side L2, and constitutes a cemented lens with the seventh lens 170. In the present embodiment, the sixth lens 160 is a plastic lens in which the twelfth surface 12 and the thirteenth surface 13 are aspherical surfaces.
The seventh lens 170 is a lens having positive refractive power with a convex surface (thirteenth surface 13) facing the object side L1 and a convex surface (fourteenth surface 14) facing the image side L2. In the present embodiment, the seventh lens 170 is a plastic lens in which the thirteenth surface 13 and the fourteenth surface 14 are aspherical surfaces.
In the present embodiment, as shown in fig. 1, a light blocking sheet 190 is provided between the second lens 120 and the fourth lens 130, a filter 200 is disposed on the image side of the seventh lens 170, and an imaging device 300 is disposed on the image side of the filter 200.
In the present embodiment, the Focal length F (effective Focal length) of the entire lens system is 1.023mm, the inter-object distance d (total track) is 13.611mm, the F value (Image Space F/#) is 2.02, the maximum half field Angle (max. field of Angle) is 115 degrees, and the entrance pupil diameter HEP is 0.507 mm.
The physical properties of each surface of wide-angle lens 1000 according to the present embodiment are shown in table 1, and the aspherical coefficients of each surface of wide-angle lens 1000 according to the present embodiment are shown in tables 2-1 and 2-2.
(Table 1)
In table 1 above, the unit of the radius of curvature, thickness, focal point distance, effective radius is mm, Nd is the refractive index for light of 587.56 nm, vd is abbe number, and denotes an aspherical surface.
(Table 2-1)
(Table 2-2)
| Noodle | A8 | A10 | | A14 | A16 | |
| 3 | 0.00000E+00 | 0.00000E+00 | 0.00000E+00 | 0.00000E+00 | 0.00000E+00 | |
| 4 | -3.29328E-03 | 2.82298E-03 | -4.88754E-04 | 0.00000E+00 | 0.00000E+00 | |
| 5 | -5.12306E-03 | 0.00000E+00 | 0.00000E+00 | 0.00000E+00 | 0.00000E+00 | |
| 6 | 0.00000E+00 | 0.00000E+00 | 0.00000E+00 | 0.00000E+00 | 0.00000E+00 | |
| 7 | 4.37857E-03 | 2.92148E-03 | 0.00000E+00 | 0.00000E+00 | 0.00000E+00 | |
| 8 | -5.94177E-03 | 1.11565E-02 | 0.00000E+00 | 0.00000E+00 | 0.00000E+00 | |
| 12 | 1.79956E-02 | -7.87537E-04 | -1.30556E-03 | 0.00000E+00 | 0.00000E+00 | |
| 13 | 1.73181E-01 | -4.77496E-02 | 4.65741E-03 | 0.00000E+00 | 0.00000E+00 | |
| 14 | 1.34046E-02 | -4.35536E-03 | 5.73510E-04 | 0.00000E+00 | 0.00000E+00 |
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.
In addition, in tables 2-1 and 2-2 above, aspherical coefficients a4, a6, A8, a10, a12, a14, and a16 when aspherical shapes of the respective surfaces are expressed by the following expression (formula 1) are shown. In the following equation, the rise (japanese: サグ amount) (axis in the optical axis direction) is Z, the height (ray height) in the direction perpendicular to the optical axis is r, the conic coefficient is K, and the reciprocal of the curvature radius is c.
[ mathematical formula 1]
Here, in wide-angle lens 1000, since focal length f3 of third lens 130 is 6.742mm and focal length f of the entire lens system is 1.023mm, the following condition 1 is satisfied:
3.000＜f3/f＜12.500。
in condition 1, if f3/f is 3.000 or less, the positive power of the third lens is too large, and it is difficult to appropriately correct various aberrations such as curvature of field, chromatic aberration of magnification, and coma, while if f3/f is 12.500 or more, it is difficult to reduce the diameter of the third lens and the inter-object distance, and it is difficult to miniaturize the entire wide-angle lens.
In contrast, in the present embodiment, since the condition 1 is satisfied, there is an advantage that various aberrations such as curvature of field, chromatic aberration of magnification, coma aberration, and the like can be easily corrected appropriately, and the entire wide-angle lens can be easily downsized.
In particular, in the present embodiment, since the relationship of 5.000 < f3/f < 10.000 is satisfied, there is an advantage that various aberrations such as curvature of field, chromatic aberration of magnification, and coma can be more easily corrected appropriately and the entire wide-angle lens can be more easily downsized.
In the wide-angle lens 1000, the focal length f4 of the fourth lens 140 is 4.923mm, and the focal length f of the entire lens system is 1.023mm, so the following condition 2 is satisfied:
4.000＜f4/f＜7.000。
in condition 2, if f4/f is 4.000 or less, the positive optical power of the fourth lens is too strong, and it is difficult to appropriately correct various aberrations such as curvature of field, chromatic aberration of magnification, and coma, while if f4/f is 7.000 or more, it is difficult to reduce the diameter of the fourth lens and the inter-object distance, and it is difficult to downsize the entire wide-angle lens.
In contrast, in the present embodiment, since the condition 2 is satisfied, there is an advantage that various aberrations such as curvature of field, chromatic aberration of magnification, coma aberration, and the like can be easily corrected appropriately, and the entire wide-angle lens can be easily downsized.
In particular, in the present embodiment, since the relationship of 4.500 < f4/f < 6.000 is satisfied, there is an advantage that various aberrations such as curvature of field, chromatic aberration of magnification, and coma can be more easily corrected appropriately and the entire wide-angle lens can be more easily downsized.
In wide-angle lens 1000, the radius of curvature R41 of the object-side lens surface (i.e., surface 7) of fourth lens 140 is-13.315 mm, and the focal length f of the entire lens system is 1.023mm, so that the following condition 3 is satisfied:
10.000＜|R41/f|＜40.000。
in condition 3, if | R41/f | is 10.000 or less, the radius of curvature of the object-side lens surface of the fourth lens is small, and when light reaching the image pickup element is reflected on the surface of the image pickup element and enters the fourth lens, the entered light is easily reflected on the object-side lens surface of the fourth lens and returns to the image pickup element, whereby ghost images are easily generated, while if | R41/f | is 40.000 or more, the refractive power of the fourth lens is small, and various aberrations are not easily corrected.
In contrast, in the present embodiment, since the condition 3 is satisfied, there is an advantage that generation of ghost can be suppressed and various aberrations can be easily and appropriately corrected.
In particular, in the present embodiment, since the relationship of 13.000 < | R41/f | < 30.000 is satisfied, there is an advantage that generation of ghost can be further suppressed and various aberrations can be more easily corrected appropriately.
In wide-angle lens 1000, the radius of curvature R41 of the object-side lens surface (i.e., surface 7) of fourth lens 140 is-13.315 mm, and the focal length f of the entire lens system is 1.023mm, so that the following condition 4 is satisfied:
-30.000＜R41/f＜-10.000。
in condition 4, if R41/f is-30.000 or less, the negative refractive power of the object-side lens surface of the fourth lens is small, and it is difficult to correct various aberrations appropriately, while if R41/f is-10.000 or more, the radius of curvature of the object-side lens surface of the fourth lens is too small, and when light that reaches the image pickup element is reflected on the surface of the image pickup element and enters the fourth lens, the entered light is easily reflected at the object-side lens surface of the fourth lens and returns to the image pickup element, and ghost images are easily generated.
In contrast, in the present embodiment, since the condition 4 is satisfied, there is an advantage that various aberrations can be easily and appropriately corrected and ghost can be suppressed.
In particular, since the present embodiment satisfies the relationship of-25.000 < R41/f < -12.000, it is advantageous that various aberrations can be corrected more easily and ghost can be suppressed more appropriately.
Further, in the wide angle lens 1000, the third lens 130 is a positive lens with a convex surface facing the image side, the fourth lens 140 is a positive lens with a convex surface facing the image side, the fifth lens 150 is a positive lens with a convex surface facing the object side and a convex surface facing the image side, the sixth lens 160 is a negative lens with a concave surface facing the image side, the seventh lens 170 is a positive lens with a convex surface facing the object side and a convex surface facing the image side, and a combined focal length f1234 of the first lens 110, the second lens 120, the third lens 130, and the fourth lens 140 is 3.148mm, and a combined focal length f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.740mm, so that the following condition 5 is satisfied:
0.800＜f1234/f567＜8.000。
in condition 5, if f1234/f567 is 0.800 or less, the focal power of the front lens group composed of the first lens, the second lens, the third lens, and the fourth lens is too strong, and it is difficult to appropriately correct various aberrations, while if f1234/f is 8.000 or more, the focal power of the front lens group composed of the first lens, the second lens, the third lens, and the fourth lens is too weak, and it is difficult to reduce the diameter of each lens of the front lens group, and it is difficult to downsize the entire wide-angle lens.
In contrast, in the present embodiment, since the condition 5 is satisfied, there is an advantage that various aberrations can be more easily corrected appropriately and the size can be more easily reduced.
Further, in the wide angle lens 1000, the third lens 130 is a positive lens with a convex surface facing the image side, the fourth lens 140 is a positive lens with a convex surface facing the image side, the fifth lens 150 is a positive lens with a convex surface facing the object side and a convex surface facing the image side, the sixth lens 160 is a negative lens with a concave surface facing the image side, the seventh lens 170 is a positive lens with a convex surface facing the object side and a convex surface facing the image side, and a combined focal length f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.740mm, and a focal length f of the entire lens system is 1.023mm, so the following condition 6 is satisfied:
2.800＜f567/f＜3.850
in condition 6, if f567/f is 2.800 or less, the optical power of the rear lens group including the fifth lens, the sixth lens, and the seventh lens is too strong, and it is difficult to appropriately correct various aberrations, particularly chromatic aberration, and if f567/f is 3.850 or more, it is difficult to reduce the diameter of each lens and the distance between object images, and it is difficult to miniaturize the entire wide-angle lens.
In contrast, in the present embodiment, since the condition 6 is satisfied, there is an advantage that various aberrations, particularly chromatic aberration, can be easily corrected appropriately and miniaturization can be achieved more easily.
In addition, in wide-angle lens 1000, since object-to-object distance d is 13.611mm and focal distance f of the entire lens system is 1.023mm, the following condition 7 is satisfied:
11.000＜d/f＜15.000
in condition 7, when d/f is 11.000 or less, it is difficult to appropriately correct various aberrations, and when d/f is 15.000 or more, the length of the entire lens system becomes too long.
In contrast, in the present embodiment, since the condition 7 is satisfied, it is easy to appropriately correct various aberrations, it is easy to obtain excellent optical characteristics, and it is possible to prevent the lens system from becoming excessively large while avoiding the length of the entire lens system from becoming excessively long.
As described above, in the present embodiment, by configuring the wide-angle lens 1000 as described above, as shown in fig. 2A to 4L, it is possible to avoid the positive optical power of the third lens from being excessively strong, and thereby it is easy to appropriately correct various aberrations such as curvature of field, chromatic aberration of magnification, and coma aberration, and excellent optical characteristics can be realized; in addition, the diameter of the lens and the distance between the object images can be reduced, so that the whole wide-angle lens is miniaturized; further, since the third lens and the fourth lens are both positive lenses, the negative focal powers of the first lens and the second lens can be increased, and therefore the diameters of the first lens and the second lens can be reduced, and the entire wide-angle lens can be more easily downsized.
(embodiment mode 2)
Fig. 5 is an explanatory view showing a wide-angle lens according to embodiment 2 of the present invention, fig. 6A is an explanatory view showing field curvature and distortion of the wide-angle lens according to embodiment 2 of the present invention, fig. 6B is an explanatory view showing field curvature and distortion of the wide-angle lens according to embodiment 2 of the present invention, fig. 7A is an explanatory view showing vertical axis chromatic aberration (lateral chromatic aberration) of the wide-angle lens according to embodiment 2 of the present invention, fig. 7B is an explanatory view showing spherical aberration (longitudinal aberration) of the wide-angle lens according to embodiment 2 of the present invention, and fig. 8A to 8L are explanatory views showing lateral aberration of the wide-angle lens according to embodiment 2 of the present invention. Here, in fig. 6A, 6B, 7A, 7B, and 8A to 8L, R is indicated as a correlation curve for red light R (wavelength 656nm), G is indicated as a correlation curve for green light G (wavelength 588nm), B is indicated as a correlation curve for blue light B (wavelength 486nm), T is indicated as correlation with the meridian plane, S is indicated as correlation with the sagittal plane, and in fig. 8A to 8L, the Maximum dimension (Maximum Scale) of the vertical axis is ± 50.000 μm.
As shown in fig. 5, the wide-angle lens 1000 includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, an aperture stop 180, a fifth lens 150, a sixth lens 160, and a seventh lens 170, which are arranged in this order from the object side (L1 side), wherein the sixth lens 160 and the seventh lens 170 are bonded together with an adhesive agent to form a cemented lens.
Here, since the basic structure of the wide-angle lens 1000 in this embodiment (i.e., whether the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, and the seventh lens 170 have positive or negative power, whether they are glass or plastic lenses, whether the object-side surface and the image-side surface are convex or concave, and whether they are spherical or aspherical) is the same as that of the wide-angle lens in embodiment 1, it is not described here in detail.
As shown in fig. 5, as in embodiment 1, a light blocking sheet 190 is provided between the second lens 120 and the fourth lens 130, a filter 200 is disposed on the image side of the seventh lens 170, and an imaging device 300 is disposed on the image side of the filter 200.
In the present embodiment, the Focal length F (effective Focal length) of the entire lens system is 1.011mm, the inter-object distance d (total track) is 13.404mm, the F value (Image Space F/#) is 2.03, the maximum half field Angle (max. field of Angle) is 109 degrees, and the entrance pupil diameter HEP is 0.498 mm.
The physical properties of each surface of wide-angle lens 1000 according to the present embodiment are shown in table 3, and the aspherical coefficients of each surface of wide-angle lens 1000 according to the present embodiment are shown in tables 4-1 and 4-2.
(Table 3)
In table 3 above, the unit of the radius of curvature, thickness, focal point distance, effective radius is mm, Nd is the refractive index for light of 587.56 nm, vd is abbe number, and denotes an aspherical surface.
(Table 4-1)
(Table 4-2)
| Noodle | 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 |
In tables 4-1 and 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.
Further, in the above tables 4-1 and 4-2, aspherical coefficients a4, a6, A8, a10, a12, a14, a16 when the surfaces are aspherical in shape are expressed by the above numerical expression 1.
Here, in wide angle lens 1000, since focal distance f3 of third lens 130 is 7.736mm and focal distance f of the entire lens system is 1.011mm, the following condition 1 is satisfied:
3.000＜f3/f＜12.500。
in condition 1, if f3/f is 3.000 or less, the positive power of the third lens is too large, and it is difficult to appropriately correct various aberrations such as curvature of field, chromatic aberration of magnification, and coma, while if f3/f is 12.500 or more, it is difficult to reduce the diameter of the third lens and the inter-object distance, and it is difficult to miniaturize the entire wide-angle lens.
In contrast, in the present embodiment, since the condition 1 is satisfied, there is an advantage that various aberrations such as curvature of field, chromatic aberration of magnification, coma aberration, and the like can be easily corrected appropriately, and the entire wide-angle lens can be easily downsized.
In particular, in the present embodiment, since the relationship of 5.000 < f3/f < 10.000 is satisfied, there is an advantage that various aberrations such as curvature of field, chromatic aberration of magnification, and coma can be more easily corrected appropriately and the entire wide-angle lens can be more easily downsized.
In the wide-angle lens 1000, since the focal length f4 of the fourth lens 140 is 5.873mm and the focal length f of the entire lens system is 1.011mm, the following condition 2 is satisfied:
4.000＜f4/f＜7.000。
in condition 2, if f4/f is 4.000 or less, the positive optical power of the fourth lens is too strong, and it is difficult to appropriately correct various aberrations such as curvature of field, chromatic aberration of magnification, and coma, while if f4/f is 7.000 or more, it is difficult to reduce the diameter of the fourth lens and the inter-object distance, and it is difficult to downsize the entire wide-angle lens.
In contrast, in the present embodiment, since the condition 2 is satisfied, there is an advantage that various aberrations such as curvature of field, chromatic aberration of magnification, coma aberration, and the like can be easily corrected appropriately, and the entire wide-angle lens can be easily downsized.
In particular, in the present embodiment, since the relationship of 4.500 < f4/f < 6.000 is satisfied, there is an advantage that various aberrations such as curvature of field, chromatic aberration of magnification, and coma can be more easily corrected appropriately and the entire wide-angle lens can be more easily downsized.
In the wide-angle lens 1000, the curvature radius R41 of the object-side lens surface (i.e., surface 7) of the fourth lens 140 is-20.063 mm, and the focal length f of the entire lens system is 1.011mm, and therefore, the following condition 3 is satisfied:
10.000＜|R41/f|＜40.000。
in condition 3, if | R41/f | is 10.000 or less, the radius of curvature of the object-side lens surface of the fourth lens is small, and when light reaching the image pickup element is reflected on the surface of the image pickup element and enters the fourth lens, the entered light is easily reflected on the object-side lens surface of the fourth lens and returns to the image pickup element, whereby ghost images are easily generated, while if | R41/f | is 40.000 or more, the refractive power of the fourth lens is small, and various aberrations are not easily corrected.
In contrast, in the present embodiment, since the condition 3 is satisfied, there is an advantage that generation of ghost can be suppressed and various aberrations can be easily and appropriately corrected.
In particular, in the present embodiment, since the relationship of 13.000 < | R41/f | < 30.000 is satisfied, there is an advantage that generation of ghost can be further suppressed and various aberrations can be more easily corrected appropriately.
In the wide-angle lens 1000, the curvature radius R41 of the object-side lens surface (i.e., surface 7) of the fourth lens 140 is-20.063 mm, and the focal length f of the entire lens system is 1.011mm, and therefore, the following condition 4 is satisfied:
-30.000＜R41/f＜-10.000。
in condition 4, if R41/f is-30.000 or less, the negative refractive power of the object-side lens surface of the fourth lens is small, and it is difficult to correct various aberrations appropriately, while if R41/f is-10.000 or more, the radius of curvature of the object-side lens surface of the fourth lens is too small, and when light that reaches the image pickup element is reflected on the surface of the image pickup element and enters the fourth lens, the entered light is easily reflected at the object-side lens surface of the fourth lens and returns to the image pickup element, and ghost images are easily generated.
In contrast, in the present embodiment, since the condition 4 is satisfied, there is an advantage that various aberrations can be easily and appropriately corrected and ghost can be suppressed.
In particular, since the present embodiment satisfies the relationship of-25.000 < R41/f < -12.000, it is advantageous that various aberrations can be corrected more easily and ghost can be suppressed more appropriately.
Further, in the wide-angle lens 1000, the third lens 130 is a positive lens with a convex surface facing the image side, the fourth lens 140 is a positive lens with a convex surface facing the image side, the fifth lens 150 is a positive lens with a convex surface facing the object side and a convex surface facing the image side, the sixth lens 160 is a negative lens with a concave surface facing the image side, the seventh lens 170 is a positive lens with a convex surface facing the object side and a convex surface facing the image side, and a combined focal length f1234 of the first lens 110, the second lens 120, the third lens 130, and the fourth lens 140 is 6.571mm, and a combined focal length f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.355mm, so that the following condition 5 is satisfied:
0.800＜f1234/f567＜8.000。
in condition 5, if f1234/f567 is 0.800 or less, the focal power of the front lens group composed of the first lens, the second lens, the third lens, and the fourth lens is too strong, and it is difficult to appropriately correct various aberrations, while if f1234/f is 8.000 or more, the focal power of the front lens group composed of the first lens, the second lens, the third lens, and the fourth lens is too weak, and it is difficult to reduce the diameter of each lens of the front lens group, and it is difficult to downsize the entire wide-angle lens.
In contrast, in the present embodiment, since the condition 5 is satisfied, there is an advantage that various aberrations can be more easily corrected appropriately and the size can be more easily reduced.
Further, in the wide angle lens 1000, the third lens 130 is a positive lens with a convex surface facing the image side, the fourth lens 140 is a positive lens with a convex surface facing the image side, the fifth lens 150 is a positive lens with a convex surface facing the object side and a convex surface facing the image side, the sixth lens 160 is a negative lens with a concave surface facing the image side, the seventh lens 170 is a positive lens with a convex surface facing the object side and a convex surface facing the image side, and a combined focal length f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.355mm, and a focal length f of the entire lens system is 1.011mm, and therefore, the following condition 6 is satisfied:
2.800＜f567/f＜3.850
in condition 6, if f567/f is 2.800 or less, the optical power of the rear lens group including the fifth lens, the sixth lens, and the seventh lens is too strong, and it is difficult to appropriately correct various aberrations, particularly chromatic aberration, and if f567/f is 3.850 or more, it is difficult to reduce the diameter of each lens and the distance between object images, and it is difficult to miniaturize the entire wide-angle lens.
In contrast, in the present embodiment, since the condition 6 is satisfied, there is an advantage that various aberrations, particularly chromatic aberration, can be easily corrected appropriately and miniaturization can be achieved more easily.
In the wide-angle lens 1000, since the inter-object distance d is 13.404mm and the focal length f of the entire lens system is 1.011mm, the following condition 7 is satisfied:
11.000＜d/f＜15.000
in condition 7, when d/f is 11.000 or less, it is difficult to appropriately correct various aberrations, and when d/f is 15.000 or more, the length of the entire lens system becomes too long.
In contrast, in the present embodiment, since the condition 7 is satisfied, it is easy to appropriately correct various aberrations, it is easy to obtain excellent optical characteristics, and it is possible to prevent the lens system from becoming excessively large while avoiding the length of the entire lens system from becoming excessively long.
As described above, in the present embodiment, by configuring the wide-angle lens 1000 as described above, as shown in fig. 6A to 8L, it is possible to avoid the positive optical power of the third lens from becoming too strong, and thereby it is easy to appropriately correct various aberrations such as curvature of field, chromatic aberration of magnification, and coma aberration, and excellent optical characteristics can be realized; in addition, the diameter of the lens and the distance between the object images can be reduced, so that the whole wide-angle lens is miniaturized; further, since the third lens and the fourth lens are both positive lenses, the negative focal powers of the first lens and the second lens can be increased, and therefore the diameters of the first lens and the second lens can be reduced, and the entire wide-angle lens can be more easily downsized.
(embodiment mode 3)
Fig. 9 is an explanatory view showing a wide-angle lens according to embodiment 3 of the present invention, fig. 10A is an explanatory view showing field curvature and distortion of the wide-angle lens according to embodiment 3 of the present invention, fig. 10B is an explanatory view showing field curvature and distortion of the wide-angle lens according to embodiment 3 of the present invention, fig. 11A is an explanatory view showing vertical axis chromatic aberration (lateral chromatic aberration) of the wide-angle lens according to embodiment 3 of the present invention, fig. 11B is an explanatory view showing spherical aberration (longitudinal aberration) of the wide-angle lens according to embodiment 3 of the present invention, and fig. 12A to 12L are explanatory views showing lateral aberration of the wide-angle lens according to embodiment 3 of the present invention. Here, in fig. 10A, 10B, 11A, 11B, and 12A to 12L, R is indicated as a correlation curve for red light R (wavelength 656nm), G is indicated as a correlation curve for green light G (wavelength 588nm), B is indicated as a correlation curve for blue light B (wavelength 486nm), T is indicated as correlation with the meridian plane, S is indicated as correlation with the sagittal plane, and in fig. 12A to 12L, the Maximum dimension (Maximum Scale) of the vertical axis is ± 50.000 μm.
As shown in fig. 9, the wide-angle lens 1000 includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, an aperture stop 180, a fifth lens 150, a sixth lens 160, and a seventh lens 170, which are arranged in this order from the object side (L1 side), wherein the sixth lens 160 and the seventh lens 170 are bonded together with an adhesive agent to form a cemented lens.
Here, since the basic structure of the wide-angle lens 1000 in this embodiment (i.e., whether the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, and the seventh lens 170 have positive or negative power, whether they are glass or plastic lenses, whether the object-side surface and the image-side surface are convex or concave, and whether they are spherical or aspherical) is the same as that of the wide-angle lens in embodiment 1, it is not described here in detail.
As shown in fig. 9, as in embodiment 1, a light blocking sheet 190 is provided between the second lens 120 and the fourth lens 130, a filter 200 is disposed on the image side of the seventh lens 170, and an imaging device 300 is disposed on the image side of the filter 200.
In the present embodiment, the Focal length F (effective Focal length) of the entire lens system is 1.018mm, the inter-object distance d (total track) is 13.383mm, the F value (Image Space F/#) is 2, the maximum half field Angle (max. field of Angle) is 108 degrees, and the entrance pupil diameter HEP is 0.509 mm.
The physical properties of each surface of wide-angle lens 1000 according to the present embodiment are shown in table 5, and the aspherical coefficients of each surface of wide-angle lens 1000 according to the present embodiment are shown in tables 6-1 and 6-2.
(Table 5)
In table 5 above, the unit of the radius of curvature, thickness, focal point distance, effective radius is mm, Nd is the refractive index for light of 587.56 nm, vd is abbe number, and denotes an aspherical surface.
(Table 6-1)
(Table 6-2)
| Noodle | 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 |
In tables 6-1 and 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.
In addition, in the above tables 6-1 and 6-2, aspherical coefficients a4, a6, A8, a10, a12, a14, a16 when the aspherical shapes of the respective surfaces are expressed by the above numerical expression 1 are shown.
Here, in the wide-angle lens 1000, since the focal length f3 of the third lens 130 is 9.374mm and the focal length f of the entire lens system is 1.018mm, the following condition 1 is satisfied:
3.000＜f3/f＜12.500。
in condition 1, if f3/f is 3.000 or less, the positive power of the third lens is too large, and it is difficult to appropriately correct various aberrations such as curvature of field, chromatic aberration of magnification, and coma, while if f3/f is 12.500 or more, it is difficult to reduce the diameter of the third lens and the inter-object distance, and it is difficult to miniaturize the entire wide-angle lens.
In contrast, in the present embodiment, since the condition 1 is satisfied, there is an advantage that various aberrations such as curvature of field, chromatic aberration of magnification, coma aberration, and the like can be easily corrected appropriately, and the entire wide-angle lens can be easily downsized.
In particular, in the present embodiment, since the relationship of 5.000 < f3/f < 10.000 is satisfied, there is an advantage that various aberrations such as curvature of field, chromatic aberration of magnification, and coma can be more easily corrected appropriately and the entire wide-angle lens can be more easily downsized.
In the wide-angle lens 1000, the focal length f4 of the fourth lens 140 is 4.796mm, and the focal length f of the entire lens system is 1.018mm, so that the following condition 2 is satisfied:
4.000＜f4/f＜7.000。
in condition 2, if f4/f is 4.000 or less, the positive optical power of the fourth lens is too strong, and it is difficult to appropriately correct various aberrations such as curvature of field, chromatic aberration of magnification, and coma, while if f4/f is 7.000 or more, it is difficult to reduce the diameter of the fourth lens and the inter-object distance, and it is difficult to downsize the entire wide-angle lens.
In contrast, in the present embodiment, since the condition 2 is satisfied, there is an advantage that various aberrations such as curvature of field, chromatic aberration of magnification, coma aberration, and the like can be easily corrected appropriately, and the entire wide-angle lens can be easily downsized.
In particular, in the present embodiment, since the relationship of 4.500 < f4/f < 6.000 is satisfied, there is an advantage that various aberrations such as curvature of field, chromatic aberration of magnification, and coma can be more easily corrected appropriately and the entire wide-angle lens can be more easily downsized.
In the wide-angle lens 1000, the curvature radius R41 of the object-side lens surface (i.e., surface 7) of the fourth lens 140 is-22.250 mm, and the focal length f of the entire lens system is 1.018mm, so that the following condition 3 is satisfied:
10.000＜|R41/f|＜40.000。
in condition 3, if | R41/f | is 10.000 or less, the radius of curvature of the object-side lens surface of the fourth lens is small, and when light reaching the image pickup element is reflected on the surface of the image pickup element and enters the fourth lens, the entered light is easily reflected on the object-side lens surface of the fourth lens and returns to the image pickup element, whereby ghost images are easily generated, while if | R41/f | is 40.000 or more, the refractive power of the fourth lens is small, and various aberrations are not easily corrected.
In contrast, in the present embodiment, since the condition 3 is satisfied, there is an advantage that generation of ghost can be suppressed and various aberrations can be easily and appropriately corrected.
In particular, in the present embodiment, since the relationship of 13.000 < | R41/f | < 30.000 is satisfied, there is an advantage that generation of ghost can be further suppressed and various aberrations can be more easily corrected appropriately.
In the wide-angle lens 1000, the curvature radius R41 of the object-side lens surface (i.e., surface 7) of the fourth lens 140 is-22.250 mm, and the focal length f of the entire lens system is 1.018mm, so that the following condition 4 is satisfied:
-30.000＜R41/f＜-10.000。
in condition 4, if R41/f is-30.000 or less, the negative refractive power of the object-side lens surface of the fourth lens is small, and it is difficult to correct various aberrations appropriately, while if R41/f is-10.000 or more, the radius of curvature of the object-side lens surface of the fourth lens is too small, and when light that reaches the image pickup element is reflected on the surface of the image pickup element and enters the fourth lens, the entered light is easily reflected at the object-side lens surface of the fourth lens and returns to the image pickup element, and ghost images are easily generated.
In contrast, in the present embodiment, since the condition 4 is satisfied, there is an advantage that various aberrations can be easily and appropriately corrected and ghost can be suppressed.
In particular, since the present embodiment satisfies the relationship of-25.000 < R41/f < -12.000, it is advantageous that various aberrations can be corrected more easily and ghost can be suppressed more appropriately.
Further, in the wide-angle lens 1000, the third lens 130 is a positive lens with a convex surface facing the image side, the fourth lens 140 is a positive lens with a convex surface facing the image side, the fifth lens 150 is a positive lens with a convex surface facing the object side and a convex surface facing the image side, the sixth lens 160 is a negative lens with a concave surface facing the image side, the seventh lens 170 is a positive lens with a convex surface facing the object side and a convex surface facing the image side, and a combined focal length f1234 of the first lens 110, the second lens 120, the third lens 130, and the fourth lens 140 is 4.528mm, and a combined focal length f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.546mm, so that the following condition 5 is satisfied:
0.800＜f1234/f567＜8.000。
in condition 5, if f1234/f567 is 0.800 or less, the focal power of the front lens group composed of the first lens, the second lens, the third lens, and the fourth lens is too strong, and it is difficult to appropriately correct various aberrations, while if f1234/f is 8.000 or more, the focal power of the front lens group composed of the first lens, the second lens, the third lens, and the fourth lens is too weak, and it is difficult to reduce the diameter of each lens of the front lens group, and it is difficult to downsize the entire wide-angle lens.
In contrast, in the present embodiment, since the condition 5 is satisfied, there is an advantage that various aberrations can be more easily corrected appropriately and the size can be more easily reduced.
Further, in the wide angle lens 1000, the third lens 130 is a positive lens with a convex surface facing the image side, the fourth lens 140 is a positive lens with a convex surface facing the image side, the fifth lens 150 is a positive lens with a convex surface facing the object side and a convex surface facing the image side, the sixth lens 160 is a negative lens with a concave surface facing the image side, the seventh lens 170 is a positive lens with a convex surface facing the object side and a convex surface facing the image side, and a combined focal length f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.546mm, and a focal length f of the entire lens system is 1.018mm, so that the following condition 6 is satisfied:
2.800＜f567/f＜3.850
in condition 6, if f567/f is 2.800 or less, the optical power of the rear lens group including the fifth lens, the sixth lens, and the seventh lens is too strong, and it is difficult to appropriately correct various aberrations, particularly chromatic aberration, and if f567/f is 3.850 or more, it is difficult to reduce the diameter of each lens and the distance between object images, and it is difficult to miniaturize the entire wide-angle lens.
In contrast, in the present embodiment, since the condition 6 is satisfied, there is an advantage that various aberrations, particularly chromatic aberration, can be easily corrected appropriately and miniaturization can be achieved more easily.
In the wide-angle lens 1000, the object-image distance d is 13.383mm, and the focal length f of the entire lens system is 1.018mm, and therefore the following condition 7 is satisfied:
11.000＜d/f＜15.000
in condition 7, when d/f is 11.000 or less, it is difficult to appropriately correct various aberrations, and when d/f is 15.000 or more, the length of the entire lens system becomes too long.
In contrast, in the present embodiment, since the condition 7 is satisfied, it is easy to appropriately correct various aberrations, it is easy to obtain excellent optical characteristics, and it is possible to prevent the lens system from becoming excessively large while avoiding the length of the entire lens system from becoming excessively long.
As described above, in the present embodiment, by configuring the wide-angle lens 1000 as described above, as shown in fig. 10A to 12L, it is possible to avoid the positive optical power of the third lens from becoming too strong, and thereby it is easy to appropriately correct various aberrations such as curvature of field, chromatic aberration of magnification, and coma aberration, and excellent optical characteristics can be realized; in addition, the diameter of the lens and the distance between the object images can be reduced, so that the whole wide-angle lens is miniaturized; further, since the third lens and the fourth lens are both positive lenses, the negative focal powers of the first lens and the second lens can be increased, and therefore the diameters of the first lens and the second lens can be reduced, and the entire wide-angle lens can be more easily downsized.
(embodiment mode 4)
Fig. 13 is an explanatory view showing a wide-angle lens according to embodiment 4 of the present invention, fig. 14A is an explanatory view showing field curvature and distortion of the wide-angle lens according to embodiment 4 of the present invention, fig. 14B is an explanatory view showing field curvature and distortion of the wide-angle lens according to embodiment 4 of the present invention, fig. 15A is an explanatory view showing vertical axis chromatic aberration (lateral chromatic aberration) of the wide-angle lens according to embodiment 4 of the present invention, fig. 15B is an explanatory view showing spherical aberration (longitudinal aberration) of the wide-angle lens according to embodiment 4 of the present invention, and fig. 16A to 16L are explanatory views showing lateral aberration of the wide-angle lens according to embodiment 4 of the present invention. Here, in fig. 14A, 14B, 15A, 15B, and 16A to 16L, R is plotted on a correlation curve of red light R (wavelength 656nm), G is plotted on a correlation curve of green light G (wavelength 588nm), B is plotted on a correlation curve of blue light B (wavelength 486nm), T is correlated with the meridian plane, S is correlated with the sagittal plane, and in fig. 16A to 16L, the Maximum dimension (Maximum Scale) of the vertical axis is ± 50.000 μm.
As shown in fig. 13, the wide-angle lens 1000 includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, an aperture stop 180, a fifth lens 150, a sixth lens 160, and a seventh lens 170, which are arranged in this order from the object side (L1 side), wherein the sixth lens 160 and the seventh lens 170 are bonded together with an adhesive agent to form a cemented lens.
Here, since the basic structure of the wide-angle lens 1000 in this embodiment (i.e., whether the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, and the seventh lens 170 have positive or negative power, whether they are glass or plastic lenses, whether the object-side surface and the image-side surface are convex or concave, and whether they are spherical or aspherical) is the same as that of the wide-angle lens in embodiment 1, it is not described here in detail.
As shown in fig. 13, as in embodiment 1, a light blocking sheet 190 is provided between the second lens 120 and the fourth lens 130, a filter 200 is disposed on the image side of the seventh lens 170, and an imaging device 300 is disposed on the image side of the filter 200.
In the present embodiment, the Focal length F (effective Focal length) of the entire lens system is 1.019mm, the inter-object distance d (total track) is 13.381mm, the F value (Image Space F/#) is 2.0163, the maximum half field Angle (max. field of Angle) is 108 degrees, and the entrance pupil diameter HEP is 0.505 mm.
The physical properties of each surface of wide-angle lens 1000 according to the present embodiment are shown in table 7, and the aspherical coefficients of each surface of wide-angle lens 1000 according to the present embodiment are shown in tables 8-1 and 8-2.
(Table 7)
In table 7 above, the unit of the radius of curvature, thickness, focal point distance, effective radius is mm, Nd is the refractive index for light of 587.56 nm, vd is abbe number, and denotes an aspherical surface.
(Table 8-1)
(Table 8-2)
| Noodle | 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 |
In tables 8-1 and 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.
Further, in table 8-1 and table 8-2 above, aspherical coefficients a4, a6, A8, a10, a12, a14, a16 when the aspherical shapes of the respective surfaces are expressed by the above numerical expression 1 are shown.
Here, in the wide angle lens 1000, since the focal distance f3 of the third lens 130 is 10.047mm and the focal distance f of the entire lens system is 1.019mm, the following condition 1 is satisfied:
3.000＜f3/f＜12.500。
in condition 1, if f3/f is 3.000 or less, the positive power of the third lens is too large, and it is difficult to appropriately correct various aberrations such as curvature of field, chromatic aberration of magnification, and coma, while if f3/f is 12.500 or more, it is difficult to reduce the diameter of the third lens and the inter-object distance, and it is difficult to miniaturize the entire wide-angle lens.
In contrast, in the present embodiment, since the condition 1 is satisfied, there is an advantage that various aberrations such as curvature of field, chromatic aberration of magnification, coma aberration, and the like can be easily corrected appropriately, and the entire wide-angle lens can be easily downsized.
In particular, in the present embodiment, since the relationship of 5.000 < f3/f < 10.000 is satisfied, there is an advantage that various aberrations such as curvature of field, chromatic aberration of magnification, and coma can be more easily corrected appropriately and the entire wide-angle lens can be more easily downsized.
In the wide-angle lens 1000, since the focal distance f4 of the fourth lens 140 is 4.797mm and the focal distance f of the entire lens system is 1.019mm, the following condition 2 is satisfied:
4.000＜f4/f＜7.000。
in condition 2, if f4/f is 4.000 or less, the positive optical power of the fourth lens is too strong, and it is difficult to appropriately correct various aberrations such as curvature of field, chromatic aberration of magnification, and coma, while if f4/f is 7.000 or more, it is difficult to reduce the diameter of the fourth lens and the inter-object distance, and it is difficult to downsize the entire wide-angle lens.
In contrast, in the present embodiment, since the condition 2 is satisfied, there is an advantage that various aberrations such as curvature of field, chromatic aberration of magnification, coma aberration, and the like can be easily corrected appropriately, and the entire wide-angle lens can be easily downsized.
In particular, in the present embodiment, since the relationship of 4.500 < f4/f < 6.000 is satisfied, there is an advantage that various aberrations such as curvature of field, chromatic aberration of magnification, and coma can be more easily corrected appropriately and the entire wide-angle lens can be more easily downsized.
In wide-angle lens 1000, the curvature radius R41 of the object-side lens surface (i.e., surface 7) of fourth lens 140 is-22.250 mm, and the focal length f of the entire lens system is 1.019mm, and therefore, the following condition 3 is satisfied:
10.000＜|R41/f|＜40.000。
in condition 3, if | R41/f | is 10.000 or less, the radius of curvature of the object-side lens surface of the fourth lens is small, and when light reaching the image pickup element is reflected on the surface of the image pickup element and enters the fourth lens, the entered light is easily reflected on the object-side lens surface of the fourth lens and returns to the image pickup element, whereby ghost images are easily generated, while if | R41/f | is 40.000 or more, the refractive power of the fourth lens is small, and various aberrations are not easily corrected.
In contrast, in the present embodiment, since the condition 3 is satisfied, there is an advantage that generation of ghost can be suppressed and various aberrations can be easily and appropriately corrected.
In particular, in the present embodiment, since the relationship of 13.000 < | R41/f | < 30.000 is satisfied, there is an advantage that generation of ghost can be further suppressed and various aberrations can be more easily corrected appropriately.
In wide-angle lens 1000, the curvature radius R41 of the object-side lens surface (i.e., surface 7) of fourth lens 140 is-22.250 mm, and the focal length f of the entire lens system is 1.019mm, and therefore, the following condition 4 is satisfied:
-30.000＜R41/f＜-10.000。
in condition 4, if R41/f is-30.000 or less, the negative refractive power of the object-side lens surface of the fourth lens is small, and it is difficult to correct various aberrations appropriately, while if R41/f is-10.000 or more, the radius of curvature of the object-side lens surface of the fourth lens is too small, and when light that reaches the image pickup element is reflected on the surface of the image pickup element and enters the fourth lens, the entered light is easily reflected at the object-side lens surface of the fourth lens and returns to the image pickup element, and ghost images are easily generated.
In contrast, in the present embodiment, since the condition 4 is satisfied, there is an advantage that various aberrations can be easily and appropriately corrected and ghost can be suppressed.
In particular, since the present embodiment satisfies the relationship of-25.000 < R41/f < -12.000, it is advantageous that various aberrations can be corrected more easily and ghost can be suppressed more appropriately.
Further, in the wide-angle lens 1000, the third lens 130 is a positive lens with a convex surface facing the image side, the fourth lens 140 is a positive lens with a convex surface facing the image side, the fifth lens 150 is a positive lens with a convex surface facing the object side and a convex surface facing the image side, the sixth lens 160 is a negative lens with a concave surface facing the image side, the seventh lens 170 is a positive lens with a convex surface facing the object side and a convex surface facing the image side, and a combined focal length f1234 of the first lens 110, the second lens 120, the third lens 130, and the fourth lens 140 is 4.815mm, and a combined focal length f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.557mm, so that the following condition 5 is satisfied:
0.800＜f1234/f567＜8.000。
in condition 5, if f1234/f567 is 0.800 or less, the focal power of the front lens group composed of the first lens, the second lens, the third lens, and the fourth lens is too strong, and it is difficult to appropriately correct various aberrations, while if f1234/f is 8.000 or more, the focal power of the front lens group composed of the first lens, the second lens, the third lens, and the fourth lens is too weak, and it is difficult to reduce the diameter of each lens of the front lens group, and it is difficult to downsize the entire wide-angle lens.
In contrast, in the present embodiment, since the condition 5 is satisfied, there is an advantage that various aberrations can be more easily corrected appropriately and the size can be more easily reduced.
Further, in the wide angle lens 1000, the third lens 130 is a positive lens with a convex surface facing the image side, the fourth lens 140 is a positive lens with a convex surface facing the image side, the fifth lens 150 is a positive lens with a convex surface facing the object side and a convex surface facing the image side, the sixth lens 160 is a negative lens with a concave surface facing the image side, the seventh lens 170 is a positive lens with a convex surface facing the object side and a convex surface facing the image side, and a combined focal length f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.557mm, and a focal length f of the entire lens system is 1.019mm, so the following condition 6 is satisfied:
2.800＜f567/f＜3.850
in condition 6, if f567/f is 2.800 or less, the optical power of the rear lens group including the fifth lens, the sixth lens, and the seventh lens is too strong, and it is difficult to appropriately correct various aberrations, particularly chromatic aberration, and if f567/f is 3.850 or more, it is difficult to reduce the diameter of each lens and the distance between object images, and it is difficult to miniaturize the entire wide-angle lens.
In contrast, in the present embodiment, since the condition 6 is satisfied, there is an advantage that various aberrations, particularly chromatic aberration, can be easily corrected appropriately and miniaturization can be achieved more easily.
In the wide-angle lens 1000, the inter-object distance d is 13.381mm, and the focal length f of the entire lens system is 1.019mm, so the following condition 7 is satisfied:
11.000＜d/f＜15.000
in condition 7, when d/f is 11.000 or less, it is difficult to appropriately correct various aberrations, and when d/f is 15.000 or more, the length of the entire lens system becomes too long.
In contrast, in the present embodiment, since the condition 7 is satisfied, it is easy to appropriately correct various aberrations, it is easy to obtain excellent optical characteristics, and it is possible to prevent the lens system from becoming excessively large while avoiding the length of the entire lens system from becoming excessively long.
As described above, in the present embodiment, by configuring the wide-angle lens 1000 in the above-described manner, as shown in fig. 14A to 16L, it is possible to avoid the positive optical power of the third lens from being excessively strong, and thereby, it is easy to appropriately correct various aberrations such as curvature of field, chromatic aberration of magnification, and coma, and excellent optical characteristics can be realized; in addition, the diameter of the lens and the distance between the object images can be reduced, so that the whole wide-angle lens is miniaturized; further, since the third lens and the fourth lens are both positive lenses, the negative focal powers of the first lens and the second lens can be increased, and therefore the diameters of the first lens and the second lens can be reduced, and the entire wide-angle lens can be more easily downsized.
(embodiment 5)
Fig. 17 is an explanatory view showing a wide-angle lens according to embodiment 5 of the present invention, fig. 18A is an explanatory view showing field curvature and distortion of the wide-angle lens according to embodiment 5 of the present invention, fig. 18B is an explanatory view showing field curvature and distortion of the wide-angle lens according to embodiment 5 of the present invention, fig. 19A is an explanatory view showing vertical axis chromatic aberration (lateral chromatic aberration) of the wide-angle lens according to embodiment 5 of the present invention, fig. 19B is an explanatory view showing spherical aberration (longitudinal aberration) of the wide-angle lens according to embodiment 5 of the present invention, and fig. 20A to 20L are explanatory views showing lateral aberration of the wide-angle lens according to embodiment 5 of the present invention. Here, in fig. 18A, 18B, 19A, 19B, and 20A to 20L, R is given to a correlation curve of red light R (wavelength 656nm), G is given to a correlation curve of green light G (wavelength 588nm), B is given to a correlation curve of blue light B (wavelength 486nm), T is given to correlation with the meridian plane, S is given to correlation with the sagittal plane, and in fig. 20A to 20L, the Maximum dimension (Maximum Scale) of the vertical axis is ± 50.000 μm.
As shown in fig. 17, the wide-angle lens 1000 includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, an aperture stop 180, a fifth lens 150, a sixth lens 160, and a seventh lens 170, which are arranged in this order from the object side (L1 side), wherein the sixth lens 160 and the seventh lens 170 are bonded together with an adhesive agent to form a cemented lens.
Here, since the basic structure of the wide-angle lens 1000 in this embodiment (i.e., whether the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, and the seventh lens 170 have positive or negative power, whether they are glass or plastic lenses, whether the object-side surface and the image-side surface are convex or concave, and whether they are spherical or aspherical) is the same as that of the wide-angle lens in embodiment 1, it is not described here in detail.
As shown in fig. 17, as in embodiment 1, a light blocking sheet 190 is provided between the second lens 120 and the fourth lens 130, a filter 200 is disposed on the image side of the seventh lens 170, and an imaging device 300 is disposed on the image side of the filter 200.
In the present embodiment, the Focal length F (effective Focal length) of the entire lens system is 1.030mm, the inter-object distance d (total track) is 13.609mm, the F value (Image Space F/#) is 2, the maximum half field Angle (max. field of Angle) is 106 degrees, and the entrance pupil diameter HEP is 0.515 mm.
The physical properties of each surface of wide-angle lens 1000 according to the present embodiment are shown in table 9, and the aspherical coefficients of each surface of wide-angle lens 1000 according to the present embodiment are shown in tables 10-1 and 10-2.
(watch 9)
In table 9 above, the unit of the radius of curvature, thickness, focal point distance, effective radius is mm, Nd is the refractive index for light of 587.56 nm, vd is abbe number, and denotes an aspherical surface.
(watch 10-1)
| Noodle | c (1/radius of curvature) | K | A4 | A6 |
| 3 | -4.38390E-02 | 0.00000E+00 | 1.02948E-02 | -1.01140E-03 |
| 4 | 7.88668E-01 | -1.13571E+00 | 5.66499E-02 | 1.84231E-03 |
| 5 | 2.82343E-01 | 0.00000E+00 | -2.18543E-02 | 5.16357E-03 |
| 6 | 1.17050E-01 | 0.00000E+00 | -6.48711E-02 | -8.41810E-03 |
| 7 | 2.24418E-01 | 0.00000E+00 | 3.04785E-02 | 1.99197E-02 |
| 8 | -1.03429E-01 | 0.00000E+00 | 9.05286E-02 | 3.48783E-02 |
| 12 | -1.83670E-01 | 0.00000E+00 | -3.32106E-02 | 4.95833E-02 |
| 13 | 9.17180E-01 | -3.67711E+00 | 1.58393E-01 | -3.03404E-02 |
| 14 | -5.07238E-01 | -6.42125E-01 | 3.25791E-02 | -8.99922E-03 |
(watch 10-2)
In tables 10-1 and 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.
Further, in the above tables 10-1 and 10-2, aspherical coefficients a4, a6, A8, a10, a12, a14, a16 when the aspherical shapes of the respective surfaces are expressed by the above numerical expression 1 are shown.
Here, in wide angle lens 1000, since focal length f3 of third lens 130 is 10.255mm and focal length f of the entire lens system is 1.030mm, the following condition 1 is satisfied:
3.000＜f3/f＜12.500。
in condition 1, if f3/f is 3.000 or less, the positive power of the third lens is too large, and it is difficult to appropriately correct various aberrations such as curvature of field, chromatic aberration of magnification, and coma, while if f3/f is 12.500 or more, it is difficult to reduce the diameter of the third lens and the inter-object distance, and it is difficult to miniaturize the entire wide-angle lens.
In contrast, in the present embodiment, since the condition 1 is satisfied, there is an advantage that various aberrations such as curvature of field, chromatic aberration of magnification, coma aberration, and the like can be easily corrected appropriately, and the entire wide-angle lens can be easily downsized.
In particular, in the present embodiment, since the relationship of 5.000 < f3/f < 10.000 is satisfied, there is an advantage that various aberrations such as curvature of field, chromatic aberration of magnification, and coma can be more easily corrected appropriately and the entire wide-angle lens can be more easily downsized.
In wide-angle lens 1000, since focal length f4 of fourth lens 140 is 4.851mm and focal length f of the entire lens system is 1.030mm, the following condition 2 is satisfied:
4.000＜f4/f＜7.000。
in condition 2, if f4/f is 4.000 or less, the positive optical power of the fourth lens is too strong, and it is difficult to appropriately correct various aberrations such as curvature of field, chromatic aberration of magnification, and coma, while if f4/f is 7.000 or more, it is difficult to reduce the diameter of the fourth lens and the inter-object distance, and it is difficult to downsize the entire wide-angle lens.
In contrast, in the present embodiment, since the condition 2 is satisfied, there is an advantage that various aberrations such as curvature of field, chromatic aberration of magnification, coma aberration, and the like can be easily corrected appropriately, and the entire wide-angle lens can be easily downsized.
In particular, in the present embodiment, since the relationship of 4.500 < f4/f < 6.000 is satisfied, there is an advantage that various aberrations such as curvature of field, chromatic aberration of magnification, and coma can be more easily corrected appropriately and the entire wide-angle lens can be more easily downsized.
Further, in the wide angle lens 1000, the third lens 130 is a positive lens with a convex surface facing the image side, the fourth lens 140 is a positive lens with a convex surface facing the image side, the fifth lens 150 is a positive lens with a convex surface facing the object side and a convex surface facing the image side, the sixth lens 160 is a negative lens with a concave surface facing the image side, the seventh lens 170 is a positive lens with a convex surface facing the object side and a convex surface facing the image side, and a combined focal length f1234 of the first lens 110, the second lens 120, the third lens 130, and the fourth lens 140 is 21.864mm, and a combined focal length f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.125mm, so that the following condition 5 is satisfied:
0.800＜f1234/f567＜8.000。
in condition 5, if f1234/f567 is 0.800 or less, the focal power of the front lens group composed of the first lens, the second lens, the third lens, and the fourth lens is too strong, and it is difficult to appropriately correct various aberrations, while if f1234/f is 8.000 or more, the focal power of the front lens group composed of the first lens, the second lens, the third lens, and the fourth lens is too weak, and it is difficult to reduce the diameter of each lens of the front lens group, and it is difficult to downsize the entire wide-angle lens.
In contrast, in the present embodiment, since the condition 5 is satisfied, there is an advantage that various aberrations can be more easily corrected appropriately and the size can be more easily reduced.
Further, in the wide-angle lens 1000, since the third lens 130 is a positive lens with a convex surface facing the image side, the fourth lens 140 is a positive lens with a convex surface facing the image side, the fifth lens 150 is a positive lens with a convex surface facing the object side and a convex surface facing the image side, the sixth lens 160 is a negative lens with a concave surface facing the image side, the seventh lens 170 is a positive lens with a convex surface facing the object side and a convex surface facing the image side, and the combined focal length f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.125mm, and the focal length f of the entire lens system is 1.030mm, the following condition 6 is satisfied:
2.800＜f567/f＜3.850
in condition 6, if f567/f is 2.800 or less, the optical power of the rear lens group including the fifth lens, the sixth lens, and the seventh lens is too strong, and it is difficult to appropriately correct various aberrations, particularly chromatic aberration, and if f567/f is 3.850 or more, it is difficult to reduce the diameter of each lens and the distance between object images, and it is difficult to miniaturize the entire wide-angle lens.
In contrast, in the present embodiment, since the condition 6 is satisfied, there is an advantage that various aberrations, particularly chromatic aberration, can be easily corrected appropriately and miniaturization can be achieved more easily.
In wide-angle lens 1000, since object-to-image distance d is 13.609mm and focal length f of the entire lens system is 1.030mm, the following condition 7 is satisfied:
11.000＜d/f＜15.000
in condition 7, when d/f is 11.000 or less, it is difficult to appropriately correct various aberrations, and when d/f is 15.000 or more, the length of the entire lens system becomes too long.
In contrast, in the present embodiment, since the condition 7 is satisfied, it is easy to appropriately correct various aberrations, it is easy to obtain excellent optical characteristics, and it is possible to prevent the lens system from becoming excessively large while avoiding the length of the entire lens system from becoming excessively long.
As described above, in the present embodiment, by configuring the wide-angle lens 1000 in the above-described manner, as shown in fig. 18A to 20L, it is possible to avoid the positive optical power of the third lens from being excessively strong, and thereby, it is easy to appropriately correct various aberrations such as curvature of field, chromatic aberration of magnification, and coma, and it is possible to realize excellent optical characteristics; in addition, the diameter of the lens and the distance between the object images can be reduced, so that the whole wide-angle lens is miniaturized; further, since the third lens and the fourth lens are both positive lenses, the negative focal powers of the first lens and the second lens can be increased, and therefore the diameters of the first lens and the second lens can be reduced, and the entire wide-angle lens can be more easily downsized.
(embodiment mode 6)
Fig. 21 is an explanatory view showing a wide-angle lens according to embodiment 6 of the present invention, fig. 22A is an explanatory view showing field curvature and distortion of the wide-angle lens according to embodiment 6 of the present invention, fig. 22B is an explanatory view showing field curvature and distortion of the wide-angle lens according to embodiment 6 of the present invention, fig. 23A is an explanatory view showing vertical axis chromatic aberration (lateral chromatic aberration) of the wide-angle lens according to embodiment 6 of the present invention, fig. 23B is an explanatory view showing spherical aberration (longitudinal aberration) of the wide-angle lens according to embodiment 6 of the present invention, and fig. 24A to 24L are explanatory views showing lateral aberration of the wide-angle lens according to embodiment 9 of the present invention. Here, in fig. 22A, 22B, 23A, 23B, and 24A to 24L, R is given to a correlation curve of red light R (wavelength 656nm), G is given to a correlation curve of green light G (wavelength 588nm), B is given to a correlation curve of blue light B (wavelength 486nm), T is given to correlation with the meridian plane, S is given to correlation with the sagittal plane, and in fig. 24A to 24L, the Maximum dimension (Maximum Scale) of the vertical axis is ± 50.000 μm.
As shown in fig. 21, the wide-angle lens 1000 includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, an aperture stop 180, a fifth lens 150, a sixth lens 160, and a seventh lens 170, which are arranged in this order from the object side (L1 side), wherein the sixth lens 160 and the seventh lens 170 are bonded together with an adhesive agent to form a cemented lens.
Here, since the basic structure of the wide-angle lens 1000 in this embodiment (i.e., whether the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, and the seventh lens 170 have positive or negative power, whether they are glass or plastic lenses, whether the object-side surface and the image-side surface are convex or concave, and whether they are spherical or aspherical) is the same as that of the wide-angle lens in embodiment 1, it is not described here in detail.
As shown in fig. 21, as in embodiment 1, a light blocking sheet 190 is provided between the second lens 120 and the fourth lens 130, a filter 200 is disposed on the image side of the seventh lens 170, and an imaging device 300 is disposed on the image side of the filter 200.
In the present embodiment, the Focal length F (effective Focal length) of the entire lens system is 1.019mm, the inter-object distance d (total track) is 13.397mm, the F value (Image Space F/#) is 2.012, the maximum half field Angle (max. field of Angle) is 108.004 degrees, and the entrance pupil diameter HEP is 0.506 mm.
The physical properties of each surface of wide-angle lens 1000 according to the present embodiment are shown in table 11, and the aspherical coefficients of each surface of wide-angle lens 1000 according to the present embodiment are shown in tables 12-1 and 12-2.
(watch 11)
In table 11 above, the unit of the radius of curvature, thickness, focal point distance, effective radius is mm, Nd is the refractive index for light of 587.56 nm, vd is abbe number, and denotes an aspherical surface.
(Table 12-1)
(Table 12-2)
| Noodle | 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 |
In tables 12-1 and 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.
Further, in table 12-1 and table 12-2 above, aspherical coefficients a4, a6, A8, a10, a12, a14, a16 when the aspherical shapes of the respective surfaces are expressed by the above numerical expression 1 are shown.
Here, in the wide angle lens 1000, since the focal distance f3 of the third lens 130 is 12.527mm and the focal distance f of the entire lens system is 1.019mm, the following condition 1 is satisfied:
3.000＜f3/f＜12.500。
in condition 1, if f3/f is 3.000 or less, the positive power of the third lens is too large, and it is difficult to appropriately correct various aberrations such as curvature of field, chromatic aberration of magnification, and coma, while if f3/f is 12.500 or more, it is difficult to reduce the diameter of the third lens and the inter-object distance, and it is difficult to miniaturize the entire wide-angle lens.
In contrast, in the present embodiment, since the condition 1 is satisfied, there is an advantage that various aberrations such as curvature of field, chromatic aberration of magnification, coma aberration, and the like can be easily corrected appropriately, and the entire wide-angle lens can be easily downsized.
In the wide-angle lens 1000, since the focal distance f4 of the fourth lens 140 is 6.634mm and the focal distance f of the entire lens system is 1.019mm, the following condition 2 is satisfied:
4.000＜f4/f＜7.000。
in condition 2, if f4/f is 4.000 or less, the positive optical power of the fourth lens is too strong, and it is difficult to appropriately correct various aberrations such as curvature of field, chromatic aberration of magnification, and coma, while if f4/f is 7.000 or more, it is difficult to reduce the diameter of the fourth lens and the inter-object distance, and it is difficult to downsize the entire wide-angle lens.
In contrast, in the present embodiment, since the condition 2 is satisfied, there is an advantage that various aberrations such as curvature of field, chromatic aberration of magnification, coma aberration, and the like can be easily corrected appropriately, and the entire wide-angle lens can be easily downsized.
In wide-angle lens 1000, the curvature radius R41 of the object-side lens surface (i.e., surface 7) of fourth lens 140 is-12.641 mm, and the focal length f of the entire lens system is 1.019mm, and therefore, the following condition 3 is satisfied:
10.000＜|R41/f|＜40.000。
in condition 3, if | R41/f | is 10.000 or less, the radius of curvature of the object-side lens surface of the fourth lens is small, and when light reaching the image pickup element is reflected on the surface of the image pickup element and enters the fourth lens, the entered light is easily reflected on the object-side lens surface of the fourth lens and returns to the image pickup element, whereby ghost images are easily generated, while if | R41/f | is 40.000 or more, the refractive power of the fourth lens is small, and various aberrations are not easily corrected.
In contrast, in the present embodiment, since the condition 3 is satisfied, there is an advantage that generation of ghost can be suppressed and various aberrations can be easily and appropriately corrected.
In particular, in the present embodiment, since the relationship of 13.000 < | R41/f | < 30.000 is satisfied, there is an advantage that generation of ghost can be further suppressed and various aberrations can be more easily corrected appropriately.
In wide-angle lens 1000, the curvature radius R41 of the object-side lens surface (i.e., surface 7) of fourth lens 140 is-12.641 mm, and the focal length f of the entire lens system is 1.019mm, and therefore, the following condition 4 is satisfied:
-30.000＜R41/f＜-10.000。
in condition 4, if R41/f is-30.000 or less, the negative refractive power of the object-side lens surface of the fourth lens is small, and it is difficult to correct various aberrations appropriately, while if R41/f is-10.000 or more, the radius of curvature of the object-side lens surface of the fourth lens is too small, and when light that reaches the image pickup element is reflected on the surface of the image pickup element and enters the fourth lens, the entered light is easily reflected at the object-side lens surface of the fourth lens and returns to the image pickup element, and ghost images are easily generated.
In contrast, in the present embodiment, since the condition 4 is satisfied, there is an advantage that various aberrations can be easily and appropriately corrected and ghost can be suppressed.
In particular, since the present embodiment satisfies the relationship of-25.000 < R41/f < -12.000, it is advantageous that various aberrations can be corrected more easily and ghost can be suppressed more appropriately.
Further, in the wide-angle lens 1000, the third lens 130 is a positive lens with a convex surface facing the image side, the fourth lens 140 is a positive lens with a convex surface facing the image side, the fifth lens 150 is a positive lens with a convex surface facing the object side and a convex surface facing the image side, the sixth lens 160 is a negative lens with a concave surface facing the image side, the seventh lens 170 is a positive lens with a convex surface facing the object side and a convex surface facing the image side, and a combined focal length f1234 of the first lens 110, the second lens 120, the third lens 130, and the fourth lens 140 is 26.363mm, and a combined focal length f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.374mm, so that the following condition 5 is satisfied:
0.800＜f1234/f567＜8.000。
in condition 5, if f1234/f567 is 0.800 or less, the focal power of the front lens group composed of the first lens, the second lens, the third lens, and the fourth lens is too strong, and it is difficult to appropriately correct various aberrations, while if f1234/f is 8.000 or more, the focal power of the front lens group composed of the first lens, the second lens, the third lens, and the fourth lens is too weak, and it is difficult to reduce the diameter of each lens of the front lens group, and it is difficult to downsize the entire wide-angle lens.
In contrast, in the present embodiment, since the condition 5 is satisfied, there is an advantage that various aberrations can be more easily corrected appropriately and the size can be more easily reduced.
Further, in the wide angle lens 1000, the third lens 130 is a positive lens with a convex surface facing the image side, the fourth lens 140 is a positive lens with a convex surface facing the image side, the fifth lens 150 is a positive lens with a convex surface facing the object side and a convex surface facing the image side, the sixth lens 160 is a negative lens with a concave surface facing the image side, the seventh lens 170 is a positive lens with a convex surface facing the object side and a convex surface facing the image side, and a combined focal length f567 of the fifth lens 150, the sixth lens 160, and the seventh lens 170 is 3.374mm, and a focal length f of the entire lens system is 1.019mm, so the following condition 6 is satisfied:
2.800＜f567/f＜3.850
in condition 6, if f567/f is 2.800 or less, the optical power of the rear lens group including the fifth lens, the sixth lens, and the seventh lens is too strong, and it is difficult to appropriately correct various aberrations, particularly chromatic aberration, and if f567/f is 3.850 or more, it is difficult to reduce the diameter of each lens and the distance between object images, and it is difficult to miniaturize the entire wide-angle lens.
In contrast, in the present embodiment, since the condition 6 is satisfied, there is an advantage that various aberrations, particularly chromatic aberration, can be easily corrected appropriately and miniaturization can be achieved more easily.
In wide-angle lens 1000, since object-to-image distance d is 13.397mm and focal length f of the entire lens system is 1.019mm, the following condition 7 is satisfied:
11.000＜d/f＜15.000
in condition 7, when d/f is 11.000 or less, it is difficult to appropriately correct various aberrations, and when d/f is 15.000 or more, the length of the entire lens system becomes too long.
In contrast, in the present embodiment, since the condition 7 is satisfied, it is easy to appropriately correct various aberrations, it is easy to obtain excellent optical characteristics, and it is possible to prevent the lens system from becoming excessively large while avoiding the length of the entire lens system from becoming excessively long.
As described above, in the present embodiment, by configuring the wide-angle lens 1000 as described above, as shown in fig. 22A to 24L, it is possible to avoid the positive optical power of the third lens from becoming too strong, and thereby it is easy to appropriately correct various aberrations such as curvature of field, chromatic aberration of magnification, and coma aberration, and excellent optical characteristics can be realized; in addition, the diameter of the lens and the distance between the object images can be reduced, so that the whole wide-angle lens is miniaturized; further, since the third lens and the fourth lens are both positive lenses, the negative focal powers of the first lens and the second lens can be increased, and therefore the diameters of the first lens and the second lens can be reduced, and the entire wide-angle lens can be more easily downsized.
The present invention is described above by way of example with reference to the accompanying drawings, and it is to be understood that the specific implementations of the present invention are not limited to the above-described embodiments.
For example, in the above embodiment, the form of the first surface 1 of the first lens 110, the form of the third surface 3 of the second lens 120, the form of the fifth surface 5 of the third lens 130, the form of the seventh surface 7 of the fourth lens 140, and the form of the tenth surface 12 of the sixth lens 160 may be appropriately changed as necessary.
In the above embodiment, the first lens 110 and the fifth lens 150 may be formed of plastic lenses, and the second lens 120, the third lens 130, the fourth lens 140, the sixth lens 160, and the seventh lens 170 may be formed of glass lenses.
Claims (9)
1. A wide-angle lens, characterized in that,
comprises a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens and a seventh lens which are arranged in sequence from an object side,
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,
the sixth lens is a negative lens and is,
the seventh lens is a positive lens,
when the focal length of the third lens is f3 and the focal length of the wide-angle lens as a whole is f, the following relationship is satisfied:
3.000＜f3/f＜12.500。
2. the wide-angle lens of claim 1,
the following relationship is satisfied:
5.000＜f3/f＜10.000。
3. the wide-angle lens of claim 1,
when the focal length of the fourth lens is f4, the following relationship is satisfied:
4.000＜f4/f＜7.000。
4. the wide-angle lens of claim 3,
the following relationship is satisfied:
4.500＜f4/f＜6.000。
5. the wide-angle lens of any one of claims 1 to 4,
when a curvature radius of the object side lens surface of the fourth lens element is R41, the following relationship is satisfied:
10.000＜|R41/f|＜40.000。
6. the wide-angle lens of claim 5,
the following relationship is satisfied:
13.000＜|R41/f|＜30.000。
7. the wide-angle lens of any one of claims 1 to 4,
the fourth lens is a positive lens with a concave object-side lens surface and a convex image-side lens surface,
when a curvature radius of the object side lens surface of the fourth lens element is R41, the following relationship is satisfied:
-30.000＜R41/f＜-10.000。
8. the wide-angle lens of claim 7,
the following relationship is satisfied:
-25.000＜R41/f＜-12.000。
9. the wide-angle lens of claim 1,
the first lens and the fifth lens are each glass lenses,
the second lens, the third lens, the fourth lens, the sixth lens, and the seventh lens are each plastic lenses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911281315.7A CN112987237A (en) | 2019-12-13 | 2019-12-13 | Wide-angle lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911281315.7A CN112987237A (en) | 2019-12-13 | 2019-12-13 | Wide-angle lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115494623A (en) * | 2022-11-14 | 2022-12-20 | 江西联创电子有限公司 | Optical lens |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115494623A (en) * | 2022-11-14 | 2022-12-20 | 江西联创电子有限公司 | Optical lens |
| CN115494623B (en) * | 2022-11-14 | 2023-03-14 | 江西联创电子有限公司 | Optical lens |
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