CN108919460B - Optical lens - Google Patents
Optical lens Download PDFInfo
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- CN108919460B CN108919460B CN201810649320.8A CN201810649320A CN108919460B CN 108919460 B CN108919460 B CN 108919460B CN 201810649320 A CN201810649320 A CN 201810649320A CN 108919460 B CN108919460 B CN 108919460B
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- lens
- negative meniscus
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- 230000003287 optical effect Effects 0.000 title claims abstract description 64
- 230000005499 meniscus Effects 0.000 claims abstract description 60
- 238000000926 separation method Methods 0.000 claims description 2
- 230000000007 visual effect Effects 0.000 abstract description 2
- 238000003384 imaging method Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 6
- 230000004075 alteration Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000005383 fluoride glass Substances 0.000 description 1
- 239000005350 fused silica glass Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
-
- 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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention provides an optical lens, which comprises a front lens group, a diaphragm and a rear lens group which are sequentially arranged from an object side surface to an image side surface, wherein the front lens group comprises a first negative meniscus lens, a second negative meniscus lens, a first biconcave lens and a first biconvex lens which are sequentially arranged from the object side surface to the image side surface; the rear lens group comprises a third negative meniscus lens, a second biconvex lens, a second biconcave lens, a third biconvex lens, a fourth biconvex lens and a fourth negative meniscus lens which are sequentially arranged from the object side surface to the image side surface, the third negative meniscus lens and the second biconvex lens are closely connected and glued to form a first cemented lens group, the second biconcave lens and the third biconvex lens are closely connected and glued to form a second cemented lens group, and the fourth biconvex lens and the fourth negative meniscus lens are closely connected and glued to form a third cemented lens group. The optical lens has the excellent performances of large relative aperture, large visual field, high resolution, low distortion and the like.
Description
Technical Field
The invention relates to the field of imaging lenses, in particular to an optical lens with large relative aperture, high resolution, high transmittance and low distortion.
Background
Along with the continuous development and perfection of scientific technology, the security monitoring consciousness applied to various fields of social production and life is continuously improved, the demand for novel high-performance monitoring equipment is increased day by day, and the rapid development of related equipment is promoted. With the continuous development of millions of high-resolution CCD and CMOS image sensors, the ultraviolet band detector with high responsivity, high sensitivity and low noise applied to non-traditional visible-near infrared bands is more and more concerned, the requirement on the corresponding matched ultraviolet band imaging objective is increased more and more, and the requirement on the ultraviolet objective with high definition and high-resolution imaging quality applied to the safe production of the modern society is also improved more and more. Namely, the ultraviolet band imaging objective lens with large relative aperture, large field of view, high resolution and low distortion is the development trend of the future ultraviolet imaging objective lens, and the ultraviolet band imaging objective lens applied to high-voltage arc discharge monitoring of power plants and transformer substations needs to meet the imaging requirements, so that the wide market application prospect is also paid attention and approved by practitioners in the photoelectric field and corresponding demand customers.
Under the condition of remote monitoring, various optical lenses in the prior art cannot achieve the performance indexes of high imaging resolution, high detail reducibility, small image distortion and image authenticity guarantee.
Disclosure of Invention
The present invention is directed to solve at least one of the above problems and to provide an optical lens having a large relative aperture, a large field of view, a high resolution, and a low distortion.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides an optical lens, wherein an optical system of the optical lens comprises a front lens group, a diaphragm and a rear lens group which are sequentially arranged from an object side surface to an image side surface, wherein the front lens group comprises a first negative meniscus lens, a second negative meniscus lens, a first biconcave lens and a first biconvex lens which are sequentially arranged from the object side surface to the image side surface; the rear lens group comprises a third negative meniscus lens, a second biconvex lens, a second biconcave lens, a third biconvex lens, a fourth biconvex lens and a fourth negative meniscus lens which are sequentially arranged from the object side surface to the image side surface, the third negative meniscus lens and the second biconvex lens are closely connected and glued to form a first cemented lens group, the second biconcave lens and the third biconvex lens are closely connected and glued to form a second cemented lens group, and the fourth biconvex lens and the fourth negative meniscus lens are closely connected and glued to form a third cemented lens group.
In some embodiments, the first negative meniscus lens, the second negative meniscus lens, the first biconcave lens, the first biconvex lens, the third negative meniscus lens, the second biconvex lens, the second biconcave lens, the third biconvex lens, the fourth biconvex lens, and the fourth negative meniscus lens are all spherical lenses.
In some embodiments, the first, second, and third cemented lens groups are each a drum lens.
In some embodiments, the air separation of the front and rear lens groups is 18.14mm-27.20 mm.
In some embodiments, the air space between the front lens group and the stop is 17mm to 25.5 mm.
In some embodiments, the air space between the stop and the rear lens group is 1.14mm to 1.70 mm.
In some embodiments, the air space between the first negative meniscus lens and the second negative meniscus lens is between 5.32mm and 7.98 mm; the air space between the second negative meniscus lens and the first biconcave lens is 3.98mm-5.98 mm; the air space between the first biconcave lens and the first biconvex lens is 8.45mm-12.67 mm.
In some embodiments, the air space between the first and second cemented lens groups is 0.67-1.01 mm, and the air space between the second and third cemented lens groups is 0.08-0.12 mm.
In some embodiments, the optical transfer function of the optical lens is greater than 0.45 at 801p/mm at a half field of view of 28 °.
The invention has the beneficial effects that: through the cooperation of a plurality of negative meniscus lenses and multiunit cemented lens group, the aperture shrink is carried out with big visual field incident light to preceding lens group, reduces the back lens group and rectifies the aberration degree of difficulty and logical light bore, reduces the lens use quantity of back lens group, has effectively controlled optical lens's transverse dimension and weight, provides one kind and has big relative aperture, distortion volume is little, the high optical lens of resolution ratio.
Drawings
Fig. 1 is a schematic diagram of an optical system of an optical lens according to an embodiment of the present invention.
FIG. 2 is a diagram of the optical transfer function of the optical system of the optical lens according to an embodiment of the present invention.
Fig. 3 is a field curvature diagram of an optical system of an optical lens in an embodiment of the present invention.
Fig. 4 is a distortion diagram of an optical system of an optical lens according to an embodiment of the present invention.
Reference numerals:
a front lens group 10; a rear lens group 20; a first negative meniscus lens 31; a second negative meniscus lens 32; a third negative meniscus lens 33; a fourth negative meniscus lens 34; a first biconcave lens 41; a second biconcave lens 42; a first biconvex lens 51; a second biconvex lens 52; a third biconvex lens 53; a fourth lenticular lens 54; a diaphragm 60; and an image plane 70.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "disposed," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following describes an optical lens provided by the present invention in detail with reference to fig. 1.
As shown in fig. 1, the present invention provides an optical lens comprising a front lens group 10, a stop 60 and a rear lens group 20 arranged in order from an object side surface to an image side surface, the front lens group 10 comprising a first negative meniscus lens 31, a second negative meniscus lens 32, a first biconcave lens 41 and a first biconvex lens 51 arranged in order from the object side surface to the image side surface; the rear lens group 20 includes a third negative meniscus lens 33, a second biconvex lens 52, a second biconcave lens 42, a third biconvex lens 53, a fourth biconvex lens 54 and a fourth negative meniscus lens 34, which are arranged in order from the object side to the image side, the third negative meniscus lens 33 and the second biconvex lens 52 are closely bonded to form a first cemented lens group, the second biconcave lens 42 and the third biconvex lens 53 are closely bonded to form a second cemented lens group, and the fourth biconvex lens 54 and the fourth negative meniscus lens 34 are closely bonded to form a third cemented lens group.
The optical lens provided by the invention is also provided with an image surface 70 at one side of the rear lens group.
According to the optical lens provided by the invention, through the matching of the plurality of negative meniscus lenses and the plurality of groups of gluing lens groups, the front lens group 10 shrinks the aperture of incident light with a large field of view, the difficulty in correcting aberration and the clear aperture of the rear lens group 20 are reduced, the number of lenses of the rear lens group 20 is reduced, the transverse size and the weight of the optical lens are effectively controlled, and the optical lens with a large relative aperture, small distortion and high resolution is provided.
Specifically, the optical lens provided by the invention has a large relative aperture (the F number of an image is 2.4), the distortion is less than 5%, the optical MTF is greater than 0.45 under 801p/mm, and the imaging target surface is matched with an 1/2' million-level pixel ultraviolet camera.
The optical lens provided by the invention can be used for preparing a high-resolution and low-distortion ultraviolet monitoring camera lens, such as a full-spherical ultraviolet monitoring camera lens. In the present invention, the direction from the object side to the image side is the incident direction of the light from left to right in fig. 1.
In one embodiment of the present invention, the first negative meniscus lens 31, the second negative meniscus lens 32, the first biconcave lens 41, the first biconvex lens 51, the third negative meniscus lens 33, the second biconvex lens 52, the second biconcave lens 42, the third biconvex lens 53, the fourth biconvex lens 54, and the fourth negative meniscus lens 34 are all spherical lenses; preferably, the spherical lens is a spherical glass lens having a high transmittance. In the optical system provided by the invention, the lenses in the front lens group 10 and the rear lens group 20 are both spherical lenses, and further are fused quartz and calcium fluoride glass materials, and under the condition of no coating, the average transmittance of the optical system is higher than 75%, so that the batch production cost is reduced.
In one embodiment of the present invention, the first cemented lens group, the second cemented lens group, and the third cemented lens group are each a drum lens. The aberration of the optical system is effectively corrected.
The optical lens provided by the invention adopts a negative and positive focal power separated anti-telephoto imaging objective structure, the focal lengths of the front lens group 10 and the rear lens group 20 are selected, and the rear principal point moves backwards, so that the clear aperture of the rear lens group 20 is reduced and unified, and the optical lens is convenient for batch straight-tube assembly.
In one embodiment of the present invention, the air space between the front lens group 10 and the rear lens group 20 is 18.14mm to 27.20 mm.
In one embodiment of the present invention, the air space between the front lens group 10 and the stop 60 is 17mm to 25.5 mm.
In one embodiment of the present invention, the air space between the stop 60 and the rear lens group 20 is 1.14mm to 1.70 mm.
In one embodiment of the present invention, the air space between the first negative meniscus lens 31 and the second negative meniscus lens 32 is 5.32mm to 7.98 mm; the air space between the second negative meniscus lens 32 and the first biconcave lens 41 is 3.98mm to 5.98 mm; the air space between the first biconcave lens 41 and the first biconvex lens 51 is 8.45mm-12.67 mm.
In one embodiment of the present invention, an air space between the first cemented lens group and the second cemented lens group is 0.67mm to 1.01mm, and an air space between the second cemented lens group and the third cemented lens group is 0.08mm to 0.12 mm.
In one embodiment of the invention, the optical transfer function of the optical lens is more than 0.45 at 801p/mm under a half field of view of 28 degrees.
In an embodiment of the present invention, as shown in fig. 1, an optical lens is disclosed, an optical system of the optical lens includes a front lens group 10, a diaphragm 60 and a rear lens group 20, which are sequentially disposed from an object side surface to an image side surface, the front lens group 10 includes a first negative meniscus lens 31, a second negative meniscus lens 32, a first biconcave lens 41 and a first biconvex lens 51, which are sequentially disposed from the object side surface to the image side surface; the rear lens group 20 includes a third negative meniscus lens 33, a second biconvex lens 52, a second biconcave lens 42, a third biconvex lens 53, a fourth biconvex lens 54 and a fourth negative meniscus lens 34, which are arranged in order from the object side to the image side, the third negative meniscus lens 33 and the second biconvex lens 52 are closely bonded to form a first cemented lens group, the second biconcave lens 42 and the third biconvex lens 53 are closely bonded to form a second cemented lens group, and the fourth biconvex lens 54 and the fourth negative meniscus lens 34 are closely bonded to form a third cemented lens group.
Wherein, the focal length of the front lens group 10 is-44.12 mm, and the focal length of the rear lens group 20 is 14.79 mm.
The air space between the front lens group 10 and the rear lens group 20 is 22.67 mm; the air space between the front lens group 10 and the stop 60 is 21.25mm, and the air space between the stop 60 and the rear lens group 20 is 1.42 mm. The air space between the first negative meniscus lens 31 and the second negative meniscus lens 32 was 6.65mm, the air space between the second negative meniscus lens 32 and the first biconcave lens 41 was 4.98mm, and the air space between the first biconcave lens 41 and the first biconvex lens 51 was 10.56 mm. The air space between the first cemented lens group and the second cemented lens group was 0.84mm, and the air space between the second cemented lens group and the third cemented lens group was 0.1 mm.
As shown in fig. 2, for the transfer function of the optical lens in the present invention, it can be seen that the MTF of the optical transfer function is greater than 0.45 at 801p/mm under a half field of view of 28 ° (full field of view of 56 °).
As shown in fig. 3 and 4, the field curvature and the relative distortion value of the optical lens of the present invention are shown, in the field curvature diagram, the vertical axis is the half field angle range, the horizontal axis is the field curvature value, and the field curvature value is less than 0.1 mm; in the relative distortion diagram, the vertical axis is a half-field angle range, the horizontal axis is relative distortion percentage, and the absolute value of the relative distortion does not exceed 5%.
As can be seen from fig. 2, 3 and 4, the aberration of the optical lens is well corrected, the optical transfer function of each field is greater than 0.45 and uniform, the relative distortion is less than 5%, the imaging quality requirements of an 1/2-inch detector and 100 ten thousand pixels (such as 1024 × 1024 pixels and 6 μm pixel imaging) can be met under the full field angle. The global surface lens element also provides convenience for mass production and reduces the cost.
The optical system in the optical lens provided by the invention achieves the following optical indexes:
(1) focal length f ═ 8 mm; (2) relative pore diameter: d/f ═ 1/2.4; (3) the field angle: 2 ω 56 °; (4) resolution ratio: 1/2' is better than 100 ten thousand pixels; (5) the spectral range used: 240nm to 290 nm.
The optical lens provided by the invention is particularly suitable for an ultraviolet band imaging objective lens, and has large relative aperture, large field of view, high resolution and low distortion; the high-definition mega pixel ultraviolet camera can be matched with various standard 1/2' high-definition mega pixel ultraviolet corresponding cameras such as 16:9, 5:4 and the like, and the purposes of low cost requirement and mass production can be achieved.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (9)
1. An optical lens is characterized in that an optical system of the optical lens comprises a front lens group, a diaphragm and a rear lens group which are sequentially arranged from an object side surface to an image side surface, wherein the front lens group comprises a first negative meniscus lens, a second negative meniscus lens, a first biconcave lens and a first biconvex lens which are sequentially arranged from the object side surface to the image side surface; the rear lens group comprises a third negative meniscus lens, a second biconvex lens, a second biconcave lens, a third biconvex lens, a fourth biconvex lens and a fourth negative meniscus lens which are sequentially arranged from the object side surface to the image side surface, the third negative meniscus lens and the second biconvex lens are closely connected and glued to form a first cemented lens group, the second biconcave lens and the third biconvex lens are closely connected and glued to form a second cemented lens group, and the fourth biconvex lens and the fourth negative meniscus lens are closely connected and glued to form a third cemented lens group.
2. The optical lens according to claim 1, wherein the first negative meniscus lens, the second negative meniscus lens, the first biconcave lens, the first biconvex lens, the third negative meniscus lens, the second biconvex lens, the second biconcave lens, the third biconvex lens, the fourth biconvex lens, and the fourth negative meniscus lens are each spherical lenses.
3. An optical lens according to claim 1, wherein the first cemented lens group, the second cemented lens group and the third cemented lens group are each a drum lens.
4. An optical lens according to claim 1, wherein the air separation of the front lens group and the rear lens group is 18.14mm to 27.20 mm.
5. An optical lens according to claim 4, characterized in that the air space between the front lens group and the diaphragm is 17mm-25.5 mm.
6. An optical lens according to claim 4 or 5, characterized in that the air space between the stop and the rear lens group is 1.14mm-1.70 mm.
7. An optical lens according to claim 1, characterized in that the air space between the first negative meniscus lens and the second negative meniscus lens is 5.32mm-7.98 mm; the air space between the second negative meniscus lens and the first biconcave lens is 3.98mm-5.98 mm; the air space between the first biconcave lens and the first biconvex lens is 8.45mm-12.67 mm.
8. An optical lens barrel according to claim 1, wherein an air space between the first cemented lens group and the second cemented lens group is 0.67mm to 1.01mm, and an air space between the second cemented lens group and the third cemented lens group is 0.08mm to 0.12 mm.
9. An optical lens as claimed in claim 1, characterized in that the optical transfer function of the optical lens is greater than 0.45 at 801p/mm at a half field of view of 28 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810649320.8A CN108919460B (en) | 2018-06-22 | 2018-06-22 | Optical lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810649320.8A CN108919460B (en) | 2018-06-22 | 2018-06-22 | Optical lens |
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| Publication Number | Publication Date |
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| CN108919460A CN108919460A (en) | 2018-11-30 |
| CN108919460B true CN108919460B (en) | 2020-04-10 |
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| CN201810649320.8A Expired - Fee Related CN108919460B (en) | 2018-06-22 | 2018-06-22 | Optical lens |
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| CN115452683B (en) * | 2022-08-05 | 2023-05-05 | 北京指真生物科技有限公司 | Fluorescence collecting lens and fluorescence collecting system |
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| JP6540052B2 (en) * | 2015-01-29 | 2019-07-10 | 株式会社シグマ | Imaging optical system |
| JP6614790B2 (en) * | 2015-04-16 | 2019-12-04 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
| CN106291887B (en) * | 2016-09-12 | 2021-04-23 | 嘉兴中润光学科技股份有限公司 | Fisheye lens |
| CN207037200U (en) * | 2017-07-31 | 2018-02-23 | 福建浩蓝光电有限公司 | A kind of optical lens |
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