CN113589478B - Lens - Google Patents
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- CN113589478B CN113589478B CN202110784661.8A CN202110784661A CN113589478B CN 113589478 B CN113589478 B CN 113589478B CN 202110784661 A CN202110784661 A CN 202110784661A CN 113589478 B CN113589478 B CN 113589478B
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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
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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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The invention discloses a lens, which comprises a first negative focal power lens and a second negative focal power lens which are sequentially arranged from an object side to an image sideThe lens comprises a mirror, a first positive focal power lens, a second positive focal power lens, a lens group, a fourth positive focal power lens, an optical filter and an image plane; the lens satisfies the following conditions: 0.5 ≤ (f/f) g1 ) X tan (FOV) is less than or equal to 0.8; BFL/TL is less than or equal to 0.35; wherein f is g1 The focal length of the lens group is f, the system focal length of the lens is f, the FOV is the field angle of the lens, BFL is the distance between the image-side facing surface of the fourth positive power lens and the image surface, and TL is the distance between the image-side facing surface of the first negative power lens and the image-side facing surface of the fourth positive power lens. Therefore, the embodiment of the invention provides the lens with the large target surface, the large aperture and the high resolution.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a lens.
Background
Thanks to the rapid development of the field of intelligent security in recent years, the optical lens is increasingly applied to the field of security, and especially has higher imaging requirements on the optical lens in the fields of intelligent buildings, intelligent traffic and the like.
The imaging target surface of the general lens in the market at present is small, the general lens cannot support the use of a 1/2.7-inch sensor, the aperture is small, the F number is about 1.2, the imaging quality is poor, and the requirement of an optical lens with high resolution cannot be supported. And the existing lens structure has larger size and can not meet the design requirement of miniaturization. With the advance of the road traffic industry to intellectualization, high-definition and environmental protection, a lens is required to achieve higher performance. Therefore, it is important to develop a lens system with large target surface, large aperture and high resolution.
Disclosure of Invention
The embodiment of the invention provides a lens, which is used for providing a lens with a large target surface, a large aperture and high resolution.
The embodiment of the present invention provides a lens assembly, which includes a first negative power lens, a second negative power lens, a first positive power lens, a second positive power lens, a lens group, a fourth positive power lens, an optical filter, and an image plane, which are sequentially arranged from an object side to an image side;
the lens satisfies the following conditions:
0.5≤(f/f g1 )×tan(FOV)≤0.8；
BFL/TL≤0.35；
wherein, f g1 The focal length of the lens group is f, the system focal length of the lens is f, the FOV is the field angle of the lens, BFL is the distance between the image-side facing surface of the fourth positive power lens and the image surface, and TL is the distance between the image-side facing surface of the first negative power lens and the image-side facing surface of the fourth positive power lens.
Further, the lens group includes a third negative power lens and a third positive power lens arranged in order from the object side to the image side.
Further, the first negative power lens includes a meniscus lens, a surface of which facing the object side is a convex surface;
the second negative-power lens comprises a meniscus lens, and one surface of the meniscus lens, which faces the object side, is a concave surface;
the first positive power lens comprises a biconvex lens;
the second positive power lens comprises a biconvex lens;
the third negative power lens comprises a biconcave lens;
the third positive power lens comprises a biconvex lens;
the fourth positive power lens includes a meniscus lens, and a surface thereof facing the object side is a convex surface.
Further, a surface of the third negative power lens facing the image side and a surface of the third positive power lens facing the object side have the same radius of curvature.
Further, the first negative focal power lens, the second negative focal power lens, the first positive focal power lens, the second positive focal power lens, the third negative focal power lens, the third positive focal power lens and the fourth positive focal power lens are spherical lenses or aspheric lenses.
Further, an aperture diaphragm is arranged between the first positive focal power lens and the second positive focal power lens.
Further, a curvature radius R2 of a surface of the first negative power lens facing the image side and a curvature radius R3 of a surface of the second negative power lens facing the object side satisfy the following condition:
(R2-R3)/(R2+R3)≤17.1。
further, the focal length f1 of the first negative power lens, the focal length f2 of the second negative power lens, and the focal length f4 of the second positive power lens satisfy the following condition:
f1≤-15；f2≤-16；f4≤13。
further, the abbe number Vd2 of the second negative power lens, the abbe number Vd4 of the second positive power lens, and the abbe number Vd6 of the third positive power lens satisfy the following conditions:
Vd2≤60；Vd4≤30；Vd6≤61。
further, the refractive index Nd2 of the second negative power lens, the refractive index Nd3 of the first positive power lens, the refractive index Nd5 of the third negative power lens, and the refractive index Nd7 of the fourth positive power lens satisfy the following conditions:
Nd2≤1.65；Nd3≤1.65；Nd5≤1.72；Nd7≥1.49。
the embodiment of the present invention provides a lens assembly, which includes a first negative power lens, a second negative power lens, a first positive power lens, a second positive power lens, a lens group, a fourth positive power lens, an optical filter, and an image plane, which are sequentially arranged from an object side to an image side; the lens satisfies the following conditions: 0.5 ≤ (f/f) g1 ) X tan (FOV) is less than or equal to 0.8; BFL/TL is less than or equal to 0.35; wherein, f g1 The focal length of the lens group is f, the system focal length of the lens is f, the FOV is the field angle of the lens, BFL is the distance between the surface of the fourth positive power lens facing the image side and the image surface, and TL is the distance between the surface of the first negative power lens facing the object side and the surface of the fourth positive power lens facing the image side.
Since, in the embodiment of the present invention, optical lenses of a specific power are arranged in the lens in order from the object side to the image side in a specific order, and the lens satisfies: 0.5 ≤ (f/f) g1 )×tan(FOV)≤0.8; BFL/TL is less than or equal to 0.35; therefore, the embodiment of the invention provides the lens with the large target surface, the large aperture and the high resolution, and the size of the lens is smaller.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings may be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic view of a lens provided in an embodiment of the present invention;
fig. 2 is a graph of an optical transfer function (MTF) of the lens in a normal temperature state in a visible light band according to an embodiment of the present invention;
fig. 3 is a graph of curvature of field and distortion of a lens in a visible light band according to an embodiment of the present invention;
fig. 4 is a transverse fan diagram of the lens provided by the embodiment of the invention in the visible light band;
fig. 5 is a dot-column diagram of a lens provided in an embodiment of the present invention in a visible light band.
Detailed Description
The present invention will be described in further detail with reference to the attached drawings, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Fig. 1 is a schematic view of a lens according to an embodiment of the present invention, where the lens includes a first negative power lens L1, a second negative power lens L2, a first positive power lens L3, a second positive power lens L4, a lens group G1, a fourth positive power lens L7, a filter M, and an image plane N, which are arranged in sequence from an object side to an image side;
the lens satisfies the following conditions:
0.5≤(f/f g1 )×tan(FOV)≤0.8；
BFL/TL≤0.35；
wherein, f g1 The focal length of the lens group is f, the system focal length of the lens is f, the FOV is the field angle of the lens, BFL is the distance between the surface of the fourth positive power lens facing the image side and the image surface, and TL is the distance between the surface of the first negative power lens facing the object side and the surface of the fourth positive power lens facing the image side.
Since, in the embodiment of the present invention, optical lenses of specific power are arranged in the lens in order from the object side to the image side in a specific order, and the lens satisfies: 0.5 ≤ (f/f) g1 ) X tan (FOV) is less than or equal to 0.8; BFL/TL is less than or equal to 0.35; therefore, the embodiment of the invention provides the lens with the large target surface, the large aperture and the high resolution, and the size of the lens is smaller.
In order to further improve the imaging quality of the lens barrel, in the embodiment of the invention, the lens group G1 comprises a third negative power lens L5 and a third positive power lens L6 which are arranged in sequence from the object side to the image side.
In order to further enable the system to be compact and the lens size to be smaller, the curvature radius of a surface of the third negative power lens facing the image side is the same as that of a surface of the third positive power lens facing the object side. And the third negative focal power lens and the third positive focal power lens are cemented into a cemented lens.
In order to further improve the imaging quality of the lens barrel, in the embodiment of the invention, the first negative power lens includes a meniscus lens, and one surface of the meniscus lens facing the object side is a convex surface;
the second negative-power lens comprises a meniscus lens, and one surface of the meniscus lens, which faces the object side, is a concave surface;
the first positive power lens includes a biconvex lens;
the second positive power lens comprises a biconvex lens;
the third negative power lens comprises a biconcave lens;
the third positive power lens comprises a biconvex lens;
the fourth positive power lens comprises a meniscus lens, and one surface of the meniscus lens, which faces the object side, is convex.
The first positive focal power lens and the second positive focal power lens have certain reverse curvature.
In an embodiment of the present invention, the first negative power lens, the second negative power lens, the first positive power lens, the second positive power lens, the third negative power lens, the third positive power lens, and the fourth positive power lens are spherical lenses or aspheric lenses.
An aperture diaphragm P is arranged between the first positive focal power lens and the second positive focal power lens, the aperture size of the aperture diaphragm P determines the aperture value of the system and the depth of field during shooting, the aperture size can be fixed, or the aperture diaphragm with adjustable aperture can be placed according to requirements to realize the adjustment of the clear aperture, namely the purposes of changing the aperture value of the system and changing the depth of field are achieved.
In view of the processing technology of the lens, in order to facilitate the processing of the lens, in the embodiment of the present invention, the curvature radius R2 of the surface of the first negative power lens facing the image side and the curvature radius R3 of the surface of the second negative power lens facing the object side satisfy the following condition:
(R2-R3)/(R2+R3)≤17.1。
in order to further improve the imaging quality of the lens, in the embodiment of the present invention, the focal length f1 of the first negative power lens, the focal length f2 of the second negative power lens, and the focal length f4 of the second positive power lens satisfy the following conditions:
f1≤-15；f2≤-16；f4≤13。
in the embodiment of the present invention, in order to enable a lens to clearly image in a relatively large temperature range, in the embodiment of the present invention, the abbe number Vd2 of the second negative power lens, the abbe number Vd4 of the second positive power lens, and the abbe number Vd6 of the third positive power lens satisfy the following conditions:
Vd2≤60；Vd4≤30；Vd6≤61。
in addition, the Abbe number Vd2 of the second negative focal power lens, the Abbe number Vd4 of the second positive focal power lens and the Abbe number Vd6 of the third positive focal power lens meet the condition that Vd2 is less than or equal to 60; vd4 is less than or equal to 30; vd6 is less than or equal to 61, and the chromatic aberration of the image can be reduced, so that the imaging quality is further improved.
In order to further reduce the total length of the lens barrel, in the embodiment of the present invention, the refractive index Nd2 of the second negative power lens, the refractive index Nd3 of the first positive power lens, the refractive index Nd5 of the third negative power lens, and the refractive index Nd7 of the fourth positive power lens satisfy the following conditions:
Nd2≤1.65；Nd3≤1.65；Nd5≤1.72；Nd7≥1.49。
the refractive index Nd2 of the second negative power lens, the refractive index Nd3 of the first positive power lens, the refractive index Nd5 of the third negative power lens and the refractive index Nd7 of the fourth positive power lens meet the condition that Nd2 is less than or equal to 1.65; nd3 is less than or equal to 1.65; nd5 is less than or equal to 1.72; the Nd7 is more than or equal to 1.49, the spherical aberration can be reduced, and the imaging quality is further improved.
The optical performance of the lens provided by the embodiment of the invention is as follows:
according to the lens provided by the embodiment of the invention, the imaging target surface can support 1/2.7 inch at most, and the imaging quality is ensured while the miniaturization of the lens structure is effectively realized.
(1) The imaging can be used by a sensor which can support the target surface at the maximum by 1/2.7 inch, and the total mechanical length of the lens does not exceed 21.5mm;
(2) the MTF value of the whole field reaches more than 0.5 under the condition of 100 lp/mm;
(3) the number of the plastic lenses of the lens is large, the processability is good, and the cost control is low;
(4) the aperture is large, the F number is 1.05, and the device is particularly suitable for monitoring requirements under low illumination conditions.
The following exemplifies the lens parameters provided by the embodiment of the present invention.
Example 1:
the radius of curvature R, center thickness Tc, refractive index Nd, abbe constant Vd and conic coefficient k of each lens of the lens satisfy the conditions listed in table 1:
TABLE 1 parameter Table
In the embodiment of the present invention, the lenses L1, L2, L3, L4, L5, L6, and L7 are all aspheric lenses.
The aspheric conic coefficients can be defined by the following aspheric equation, but are not limited to the following representation:
wherein Z is the axial rise of the aspheric surface in the Z direction; r is the height of the aspheric surface; c is the curvature of the fitting sphere, and the numerical value is the reciprocal of the curvature radius; k is the fitting cone coefficient; A-G are coefficients of 4 th, 6 th, 8 th, 10 th, 12 th, 14 th and 16 th order terms of the aspheric polynomial. As shown in table 2:
TABLE 2 parameter Table
The surface numbers in tables 1 and 2 are those of the lenses from left to right in the schematic view of the lens structure shown in fig. 1.
The lens provided by the embodiment has the following optical technical indexes:
the total optical length TTL is less than or equal to 21.5mm;
focal length f of the lens: 6mm;
angle of view of lens: 66 °;
optical distortion of the lens: -14.5%;
aperture FNO of lens system: FNO is less than or equal to 1.05;
size of lens target surface: is more than or equal to phi 6.6mm.
The lens provided by the embodiment is further described by analyzing the embodiment in detail.
The optical transfer function is used for evaluating the imaging quality of the imaging system in a more accurate, visual and common mode, the higher and smoother curve of the optical transfer function shows that the imaging quality of the system is better, and various aberrations (such as spherical aberration, coma aberration, astigmatism, field curvature, axial chromatic aberration, vertical axis chromatic aberration and the like) are well corrected.
As shown in fig. 2, it is a graph of optical transfer function (MTF) of the lens in a normal temperature state in the visible light band; as shown in fig. 3, a graph of field curvature and distortion of a lens in the visible light band; as shown in fig. 4, it is a transverse light fan diagram of the lens in the visible light band; as shown in fig. 5, a dot-sequence diagram of the lens in the visible light band is shown.
As can be seen from fig. 2, the optical transfer function (MTF) curve of the lens in the normal temperature state in the visible light portion is smooth and concentrated, and the average MTF value of the full field of view (half-image height Y' =3.3 mm) is above 0.5; therefore, the lens provided by the embodiment can meet higher imaging requirements;
as can be seen from fig. 3, the curvature of field of the lens is controlled within ± 0.1 mm. The curvature of field is also called as "curvature of field". When the lens has field curvature, the intersection point of the whole light beam is not overlapped with an ideal image point, and although a clear image point can be obtained at each specific point, the whole image plane is a curved surface. T represents the meridional field curvature, and S represents the sagittal field curvature. The field curvature curve shows the distance of the current focal plane or image plane to the paraxial focal plane as a function of field coordinates, and the meridional field curvature data is the distance from the currently determined focal plane to the paraxial focal plane measured along the Z axis and measured in the meridional (YZ plane). Sagittal curvature data measures distances measured in a plane perpendicular to the meridian plane, the baseline in the schematic is on the optical axis, the top of the curve represents the maximum field of view (angle or height), and no units are set on the longitudinal axis, since the curve is always normalized by the maximum radial field of view.
As can be seen from FIG. 3, the lens distortion control is better, within-14.5%. The curves of fig. 3 with reference to a plurality of wavelengths (0.436 mm, 0.486mm, 0.546mm, 0.587mm and 0.656 mm) coincide in fig. 3. Generally, lens distortion is a general term of intrinsic perspective distortion of an optical lens, that is, distortion caused by perspective, which is very unfavorable for the imaging quality of a photograph, and after all, the purpose of photography is to reproduce rather than exaggerate, but because the distortion is intrinsic characteristics of the lens (converging light rays of a convex lens and diverging light rays of a concave lens), the distortion cannot be eliminated, and only can be improved. As can be seen from fig. 3, the distortion of the fixed-focus lens provided by the embodiment of the present invention is only-14.5%, and thus the distortion is set to balance the focal length, the field angle and the size of the target surface of the corresponding camera, and the distortion caused by the distortion can be corrected by the post-image processing.
As can be seen from fig. 4, the curves in the fan map are more concentrated, and the spherical aberration and the chromatic dispersion of the lens are better controlled.
As can be seen from fig. 5, the imaging system has a small spot radius, is relatively concentrated, and has good corresponding aberration and coma.
In summary, the embodiment of the invention provides an optical lens with low cost, large target surface and high imaging definition. The lens adopts 7 optical lenses with specific structural shapes, and the optical lenses are arranged in sequence from the object side to the image side according to a specific sequence, and the lens can realize better distortion control and excellent imaging characteristics through distribution and combination of specific optical powers of the optical lenses.
The embodiment of the present invention provides a lens assembly, which includes a first negative power lens, a second negative power lens, a first positive power lens, a second positive power lens, a lens group, a fourth positive power lens, an optical filter, and an image plane, which are sequentially arranged from an object side to an image side; the lens satisfies the following conditions: 0.5 ≤ (f/f) g1 ) X tan (FOV) is less than or equal to 0.8; BFL/TL is less than or equal to 0.35; wherein f is g1 The focal length of the lens group is f, the system focal length of the lens is f, the FOV is the field angle of the lens, BFL is the distance between the image-side facing surface of the fourth positive power lens and the image surface, and TL is the distance between the image-side facing surface of the first negative power lens and the image-side facing surface of the fourth positive power lens.
Since, in the embodiment of the present invention, optical lenses of a specific power are arranged in the lens in order from the object side to the image side in a specific order, and the lens satisfies: 0.5 ≤ (f/f) g1 ) X tan (FOV) is less than or equal to 0.8; BFL/TL is less than or equal to 0.35; therefore, the embodiment of the invention provides a large target surface, a large aperture and high resolutionRate of the lens and smaller lens size.
The imaging plane size supports a sensor (CCD/CMOS) camera with the diameter of 6.6mm at most, and the requirement of high resolution of equipment is met.
The MTF value of the whole field reaches more than 0.5 under the condition of 100lp/mm, and the imaging characteristic is excellent.
The focal power of each lens of the lens is distributed reasonably, the shape of the lens is convenient to process, and the cost of the lens is lower.
The lens aperture is large, the F number is 1.05, and the monitoring requirement under the low illumination condition is particularly suitable.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. The lens is characterized in that the lens consists of a first negative focal power lens, a second negative focal power lens, a first positive focal power lens, a second positive focal power lens, a lens group, a fourth positive focal power lens, an optical filter and an image plane which are sequentially arranged from an object side to an image side;
the lens satisfies the following conditions:
0.5≤（f/f g1 ）×tan（FOV）≤0.8；
BFL/TL≤0.35；
wherein f is g1 Setting the focal length of the lens group, f as the system focal length of the lens, FOV as the field angle of the lens, BFL as the distance between the image-side-facing surface of the fourth positive focal power lens and the image surface, TL as the distance between the image-side-facing surface of the first negative focal power lens and the image-side-facing surface of the fourth positive focal power lens;
the first negative-power lens is a meniscus lens, and one surface of the first negative-power lens, which faces the object side, is a convex surface;
the second negative-power lens is a meniscus lens, and one surface of the second negative-power lens, which faces the object side, is a concave surface;
the first positive focal power lens is a biconvex lens;
the second positive focal power lens is a biconvex lens;
the third negative focal power lens is a biconcave lens;
the third positive focal power lens is a biconvex lens;
the fourth positive power lens is a meniscus lens, and one surface of the fourth positive power lens facing the object side is a convex surface;
the lens group is composed of a third negative focal power lens and a third positive focal power lens which are arranged in sequence from the object side to the image side.
2. The lens barrel according to claim 1, wherein the third negative power lens and the third positive power lens are cemented into a cemented lens.
3. The lens barrel as claimed in claim 1, wherein the first and second positive power lenses have a negative curvature.
4. The lens barrel as claimed in claim 1, wherein the first negative power lens, the second negative power lens, the first positive power lens, the second positive power lens, the third negative power lens, the third positive power lens and the fourth positive power lens are spherical lenses or aspherical lenses.
5. The lens barrel as claimed in claim 1, wherein an aperture stop is disposed between the first positive power lens and the second positive power lens.
6. The lens barrel according to claim 1, wherein a radius of curvature R2 of a surface of the first negative power lens facing the image side and a radius of curvature R3 of a surface of the second negative power lens facing the object side satisfy the following condition:
（R2-R3）/（R2+R3）≤17.1。
7. the lens barrel according to claim 1, wherein a focal length f1 of the first negative power lens, a focal length f2 of the second negative power lens, and a focal length f4 of the second positive power lens satisfy the following condition:
f1≤-15；f2≤-16；f4≤13。
8. the lens barrel according to claim 1, wherein the abbe number Vd2 of the second negative power lens, the abbe number Vd4 of the second positive power lens, and the abbe number Vd6 of the third positive power lens satisfy the following conditions:
Vd2≤60；Vd4≤30；Vd6≤61。
9. the lens barrel according to claim 1, wherein a refractive index Nd2 of the second negative power lens, a refractive index Nd3 of the first positive power lens, a refractive index Nd5 of the third negative power lens, and a refractive index Nd7 of the fourth positive power lens satisfy the following conditions:
Nd2≤1.65；Nd3≤1.65；Nd5≤1.72；Nd7≥1.49。
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004354916A (en) * | 2003-05-30 | 2004-12-16 | Matsushita Electric Ind Co Ltd | Zoom lens, electronic still camera and video camera using the same |
| JP2010176015A (en) * | 2009-01-30 | 2010-08-12 | Nikon Corp | Wide-angle lens, imaging apparatus, and method for manufacturing the wide angle-lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004354916A (en) * | 2003-05-30 | 2004-12-16 | Matsushita Electric Ind Co Ltd | Zoom lens, electronic still camera and video camera using the same |
| JP2010176015A (en) * | 2009-01-30 | 2010-08-12 | Nikon Corp | Wide-angle lens, imaging apparatus, and method for manufacturing the wide angle-lens |
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