CN216351491U - Low-distortion aerial camera lens - Google Patents
Low-distortion aerial camera lens Download PDFInfo
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- CN216351491U CN216351491U CN202123182037.5U CN202123182037U CN216351491U CN 216351491 U CN216351491 U CN 216351491U CN 202123182037 U CN202123182037 U CN 202123182037U CN 216351491 U CN216351491 U CN 216351491U
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- 230000005499 meniscus Effects 0.000 claims abstract description 12
- 238000003384 imaging method Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 230000003287 optical effect Effects 0.000 abstract description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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Abstract
The utility model relates to a low-distortion aerial photographing lens, and belongs to the technical field of optical lenses. The low-distortion aerial photographing lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a lens cone which are coaxially arranged; the first lens, the second lens, the third lens, the fourth lens and the fifth lens are sequentially fixed in the lens barrel along the light propagation direction, the first lens is a positive meniscus lens, the second lens is a negative meniscus lens, the third lens is a negative meniscus lens, adjacent surfaces of the first lens, the second lens and the third lens are fixed together to form a cemented lens, the fourth lens is a biconcave lens, the fifth lens is a biconvex lens, and adjacent surfaces of the fourth lens and the fifth lens are fixed together to form the cemented lens. The low-distortion aerial photographing lens is simple in structure, easy to process, assemble and adjust, low in distortion and capable of achieving clear imaging of a target.
Description
Technical Field
The utility model belongs to the technical field of optical lenses, and particularly relates to a low-distortion aerial photographing lens which is suitable for aerial photographing.
Background
An aerial camera is an optical instrument mounted on an aircraft to capture ground objects from the air, a camera used for photogrammetry, reconnaissance, etc. on the ground, in the air, on an aircraft or other aircraft. Due to the particularity of the aviation environment, the aviation field requires that the lens clearly images a target under the condition that parameters such as the environmental temperature, the atmospheric pressure and the like are changed, and meanwhile, the aerial photographing head has severe requirements on the distortion, the imaging transfer function and the weight of the lens.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides a low distortion aerial camera lens, which has a simple structure, is easy to process and adjust, has low distortion, and can realize clear imaging of a target.
In order to realize the purpose, the following technical scheme is adopted:
the utility model provides a low-distortion aerial photographing lens which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a lens barrel, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the lens barrel are coaxially arranged;
the first lens, the second lens, the third lens, the fourth lens and the fifth lens are sequentially fixed in the lens barrel along the light propagation direction, the first lens is a positive meniscus lens, the second lens is a negative meniscus lens, the third lens is a negative meniscus lens, the adjacent surfaces of the first lens, the second lens and the third lens are fixed together to form a cemented lens, the fourth lens is a biconcave lens, the fifth lens is a biconvex lens, and the adjacent surfaces of the fourth lens and the fifth lens are fixed together to form the cemented lens.
Furthermore, a connecting cylinder is fixedly sleeved on the outer wall of the lens cone, one end face of the connecting cylinder is aligned with the light emergent face of the lens cone, the length of the connecting cylinder is smaller than that of the lens cone, and external threads are arranged on the outer wall of the connecting cylinder.
Further, the maximum outer diameter of the connector barrel is 26 mm.
Furthermore, the lens cone comprises a first section of cylinder, a second section of cylinder and a third section of cylinder which are coaxially arranged, the first section of cylinder, the second section of cylinder and the third section of cylinder are cylinders with openings at the front ends, the outer diameters of the cylinders are sequentially reduced, the rear end face of the first section of cylinder is fixedly connected with the front end face of the second section of cylinder, and the rear end face of the second section of cylinder is fixedly connected with the front end face of the third section of cylinder.
Furthermore, a chamfer is arranged at the joint of the first section of the cylinder and the second section of the cylinder.
Further, the maximum length of the lens barrel is 14.74mm, and the maximum outer diameter of the lens barrel is 15 mm.
Further, the material of the first lens is H-ZLAF55D, the curvature radius of the front surface and the curvature radius of the rear surface are 10.180mm and 79.890mm respectively, and the thickness is 2.700 mm;
the material of the second lens is ZF5, the curvature radiuses of the front surface and the rear surface are 78.890mm and 10.000mm respectively, and the thickness is 1.000 mm;
the third lens is made of H-F13, the curvature radiuses of the front surface and the rear surface are respectively 10.000mm and 9.336mm, and the thickness is 1.200 mm;
the fourth lens is made of H-ZF1, the curvature radiuses of the front surface and the rear surface are 12.616mm and 17.2100mm respectively, the thickness is 0.900mm, and the distance between the fourth lens and the third lens is 3.532 mm;
the fifth lens is made of H-ZLAF55D, the curvature radiuses of the front surface and the rear surface are 17.210mm and 12.363mm respectively, and the thickness is 2.300 mm.
Furthermore, a pressing ring is arranged in front of the first lens, a space ring is arranged between the third lens and the fourth lens, a circular boss is arranged at the inner edge of a light outlet of the lens barrel, the cemented lens composed of the first lens, the second lens and the third lens is axially positioned through the pressing ring and the space ring, and the cemented lens composed of the fourth lens and the fifth lens is axially positioned through the space ring and the circular boss of the lens barrel.
Compared with the prior art, the utility model has the beneficial effects that:
the low-distortion aerial photographing lens is designed by using a high transfer function, no distortion and light weight, has a simple structure, is easy to process and adjust, has low distortion, and can realize clear imaging of a target, the low-distortion aerial photographing lens designed by using the optimized parameters in the implementation mode has a design spectrum section of 486-656 nm, a focal length of 25mm, a transfer function MTF of more than 0.38@50lp/mm, distortion within a full field range of more than 0.4 percent and a working temperature of-20 ℃ to +50 ℃.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a cross-sectional view of a low distortion aerial lens provided in the present invention;
FIG. 2 is an isometric view of a low distortion aerial lens provided by the present invention;
in the figure, 1, a first lens, 2, a second lens, 3, a third lens, 4, a fourth lens, 5, a fifth lens, 6, a lens barrel, 7, a pressing ring, 8, a spacing ring, 9 and a connecting cylinder.
Detailed Description
For a further understanding of the utility model, reference will now be made to the preferred embodiments of the utility model, but it is to be understood that the description is intended to illustrate further features and advantages of the utility model, and not to limit the scope of the claims.
As shown in fig. 1 to 2, the low distortion aerial camera lens of the present invention includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5 and a lens barrel 6, which are coaxially disposed.
In the present embodiment, the lens barrel 6 is cylindrical, and the size is not particularly limited, and the length of the lens barrel 6 may be generally 14.74mm, and the maximum outer diameter of the lens barrel 6 may be 15 mm. Preferably, the lens barrel 6 comprises a first section of barrel, a second section of barrel and a third section of barrel which are coaxially arranged, the first section of barrel, the second section of barrel and the third section of barrel are cylinders with openings at the front ends, the outer diameters of the cylinders are sequentially reduced, the rear end face of the first section of barrel is fixedly connected with the front end face of the second section of barrel, and the rear end face of the second section of barrel is fixedly connected with the front end face of the third section of barrel. Preferably, a chamfer is arranged at the joint of the first section of barrel and the second section of barrel. For the convenience of lens installation, preferably, a connecting cylinder 9 is fixed on the outer wall of the lens barrel 6 in a sleeved mode, one end face of the connecting cylinder 9 is aligned with the light emergent face of the lens barrel, the length of the connecting cylinder 9 is smaller than that of the lens barrel, and external threads are arranged on the outer wall of the connecting cylinder 9. The connecting cylinder 9 serves as an external interface for fixing the entire lens in a practical application environment. The maximum outer diameter of the connector barrel 9 is preferably 26 mm.
In the present embodiment, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, and the fifth lens 5 are fixed in the lens barrel 6 in this order along the light propagation direction. The first lens 1 is a positive meniscus lens, the second lens 2 is a negative meniscus lens, the third lens 3 is a negative meniscus lens, and the adjacent surfaces of the first lens 1, the second lens 2, and the third lens 3 are fixed together to form a cemented lens. Preferably, the first lens 1 is made of H-ZLAF55D, the front and rear surfaces have radii of curvature of 10.180mm and 79.890mm, respectively, and the thickness is 2.700 mm; the material of the second lens 2 is ZF5, the radii of curvature of the front and rear surfaces are 78.890mm and 10.000mm, respectively, and the thickness is 1.000 mm; the third lens 3 was made of H-F13, and had front and rear surfaces with radii of curvature of 10.000mm and 9.336mm, respectively, and a thickness of 1.200 mm. The fourth lens 4 is a biconcave lens, the fifth lens 5 is a biconvex lens, and the adjacent surfaces of the fourth lens 4 and the fifth lens 5 are fixed together to form a cemented lens. Preferably, the fourth lens 4 is made of H-ZF1, the curvature radiuses of the front and rear surfaces are 12.616mm and 17.2100mm respectively, the thickness is 0.900mm, and the distance between the fourth lens 4 and the third lens 3 is 3.532 mm; the fifth lens 5 was made of H-ZLAF55D, and had front and rear surfaces with radii of curvature of 17.210mm and 12.363mm, respectively, and a thickness of 2.300 mm.
In this embodiment, it is preferable that a pressing ring 7 is disposed in front of the first lens 1, a spacer 8 is disposed between the third lens 3 and the fourth lens 4, and an annular boss is disposed on an inner edge of a light outlet of the lens barrel 6; the first lens 1, the second lens 2 and the third lens 3 are axially positioned through the pressing ring 7 and the spacing ring 8, and the fourth lens 4 and the fifth lens 5 are axially positioned through the spacing ring 8 and the circular boss of the lens barrel 6. The spacer 8 also serves as a diaphragm to process stray light.
The light path of the low-distortion aerial photographing lens is that light enters the lens barrel 6 through the light inlet of the lens barrel 6, sequentially passes through the first lens, the second lens, the third lens, the fourth lens and the fifth lens, and then is emitted out of the lens from the light outlet of the lens barrel 6.
It should be understood that the above embodiments are only examples for clearly illustrating the present invention, and are not intended to limit the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the utility model may be made without departing from the spirit or scope of the utility model.
Claims (8)
1. The low-distortion aerial photographing lens is characterized by comprising a first lens (1), a second lens (2), a third lens (3), a fourth lens (4), a fifth lens (5) and a lens cone (6) which are coaxially arranged;
the lens comprises a lens barrel (6), and is characterized in that a first lens (1), a second lens (2), a third lens (3), a fourth lens (4) and a fifth lens (5) are sequentially fixed in the lens barrel (6) along the light propagation direction, the first lens (1) is a positive meniscus lens, the second lens (2) is a negative meniscus lens, the third lens (3) is a negative meniscus lens, the adjacent surfaces of the first lens (1), the second lens (2) and the third lens are fixed together to form a cemented lens, the fourth lens (4) is a biconcave lens, the fifth lens (5) is a biconvex lens, and the adjacent surfaces of the fourth lens (4) and the fifth lens (5) are fixed together to form a cemented lens.
2. The low-distortion aerial camera lens according to claim 1, wherein a connecting cylinder (9) is sleeved and fixed on the outer wall of the lens barrel (6), one end face of the connecting cylinder (9) is aligned with the light emergent face of the lens barrel (6), the length of the connecting cylinder (9) is smaller than that of the lens barrel (6), and external threads are arranged on the outer wall of the connecting cylinder (9).
3. A low distortion aerial lens according to claim 2, characterized in that the connecting cylinder (9) has a maximum outer diameter of 26 mm.
4. The low-distortion aerial photographing lens according to any one of claims 1 to 3, wherein the lens barrel (6) comprises a first section of barrel, a second section of barrel and a third section of barrel which are coaxially arranged, four sections of barrels of the first section of barrel, the second section of barrel and the third section of barrel are cylinders with open front ends, the outer diameters of the four sections of barrels are sequentially reduced, the rear end face of the first section of barrel is fixedly connected with the front end face of the second section of barrel, and the rear end face of the second section of barrel is fixedly connected with the front end face of the third section of barrel.
5. The low distortion aerial lens of claim 4 wherein the junction of the first and second sections of barrel is chamfered.
6. A low distortion aerial lens according to any one of claims 1 to 3, wherein the length of the lens barrel (6) is 14.74mm, and the maximum outer diameter of the lens barrel (6) is 15 mm.
7. A low distortion aerial lens according to any one of claims 1 to 3,
the first lens (1) is made of H-ZLAF55D, the curvature radiuses of the front surface and the rear surface are 10.180mm and 79.890mm respectively, and the thickness is 2.700 mm;
the material of the second lens (2) is ZF5, the curvature radiuses of the front surface and the rear surface are 78.890mm and 10.000mm respectively, and the thickness is 1.000 mm;
the third lens (3) is made of H-F13, the curvature radiuses of the front surface and the rear surface are respectively 10.000mm and 9.336mm, and the thickness is 1.200 mm;
the fourth lens (4) is made of H-ZF1, the curvature radiuses of the front surface and the rear surface are 12.616mm and 17.2100mm respectively, the thickness is 0.900mm, and the distance between the fourth lens (4) and the third lens (3) is 3.532 mm;
the fifth lens (5) is made of H-ZLAF55D, the curvature radiuses of the front surface and the rear surface are 17.210mm and 12.363mm respectively, and the thickness is 2.300 mm.
8. The low-distortion aerial camera lens according to any one of claims 1 to 3, wherein a pressing ring (7) is arranged in front of the first lens (1), a spacing ring (8) is arranged between the third lens (3) and the fourth lens (4), a circular boss is arranged at the inner edge of a light outlet of the lens cone (6), the first lens (1), the second lens (2) and the third lens (3) are axially positioned through the pressing ring (7) and the spacing ring (8), and the fourth lens (4) and the fifth lens (5) are axially positioned through the spacing ring (8) and the circular boss of the lens cone (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123182037.5U CN216351491U (en) | 2021-12-17 | 2021-12-17 | Low-distortion aerial camera lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123182037.5U CN216351491U (en) | 2021-12-17 | 2021-12-17 | Low-distortion aerial camera lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216351491U true CN216351491U (en) | 2022-04-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123182037.5U Active CN216351491U (en) | 2021-12-17 | 2021-12-17 | Low-distortion aerial camera lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216351491U (en) |
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2021
- 2021-12-17 CN CN202123182037.5U patent/CN216351491U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240424 Address after: Room 11318, Building 1, No. 16 Pingle Street, Changhe Street, Binjiang District, Hangzhou City, Zhejiang Province, 310000 Patentee after: Hangzhou Changguang Borui Technology Co.,Ltd. Country or region after: China Address before: Room C301-2, 1759 Mingxi Road, Gaoxinbei District, Changchun City, Jilin Province, 130000 Patentee before: CHANGCHUN RUISHI PHOTOELECTRIC TECHNOLOGY CO.,LTD. Country or region before: China |
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| TR01 | Transfer of patent right |