CN112462494A - Long-focus large-aperture monitoring lens - Google Patents
Long-focus large-aperture monitoring lens Download PDFInfo
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- CN112462494A CN112462494A CN202011215623.2A CN202011215623A CN112462494A CN 112462494 A CN112462494 A CN 112462494A CN 202011215623 A CN202011215623 A CN 202011215623A CN 112462494 A CN112462494 A CN 112462494A
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Abstract
The invention discloses a long-focus large-aperture monitoring lens, which comprises a convex-concave positive lens L1, a convex-concave positive lens L2, a biconvex positive lens L3, a biconcave negative lens L4, a convex-concave negative lens L5, a convex-concave positive lens L6, a convex-concave positive lens L7, a biconcave negative lens L8 and a convex-concave positive lens L9 which are sequentially arranged along the incident direction of light rays, wherein: a double convex positive lens L3 and a double concave negative lens L4 form a first glue combination; the convex-concave negative lens L5 and the convex-concave positive lens L6 form a second cemented group; the concave-convex positive lens L7 and the double-concave negative lens L8 form a third glue combination; the long-focus large-aperture monitoring lens further meets the following conditions: TTL/f <1, 1.5< f1/f <2.5, 0.7< f2/f < 1.3. The monitoring lens meets the requirements of a large aperture, is miniaturized and lightweight, does not deviate in focal plane at-40-80 ℃, has high image resolution, is confocal day and night and has a long monitoring distance.
Description
Technical Field
The invention belongs to the field of optical lenses, and particularly relates to a long-focus large-aperture monitoring lens.
Background
In the telephoto type lens, since the focal length is long, the aperture is relatively small in order to prevent the aperture from being too large. In recent years, however, higher specifications have been demanded for telephoto lenses used in apparatuses, and a larger light flux amount and better image quality have been demanded, that is, an aperture has been increased and an effective diameter of an on-axis light flux passing through a lens group has been increased. Once the effective diameter of the lens group is increased, the weight of the lens group is increased, and the larger the aperture is, the more obvious the spherical aberration is, and the more difficult it is to ensure the higher imaging performance.
Disclosure of Invention
The invention aims to solve the problems, and provides a long-focus large-aperture monitoring lens, which increases the aperture by reasonably distributing the focal power and the diaphragm position of each lens group, is miniaturized and light-weighted, is suitable for the circuit heating and low-temperature environment of an external camera, can not deviate the focal plane at-40-80 ℃, has high image resolution, is confocal day and night and has long monitoring distance.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a long-focal-length large-aperture monitoring lens, which comprises a convex-concave positive lens L1, a convex-concave positive lens L2, a biconvex positive lens L3, a biconcave negative lens L4, a convex-concave negative lens L5, a convex-concave positive lens L6, a convex-concave positive lens L7, a biconcave negative lens L8 and a convex-concave positive lens L9 which are sequentially arranged along the incident direction of light rays, wherein:
a double convex positive lens L3 and a double concave negative lens L4 form a first glue combination;
the convex-concave negative lens L5 and the convex-concave positive lens L6 form a second cemented group;
the concave-convex positive lens L7 and the double-concave negative lens L8 form a third glue combination;
the long-focus large-aperture monitoring lens further meets the following conditions:
TTL/f<1，1.5<f1/f<2.5，0.7<f2/f<1.3
wherein TTL is the total lens length, f is the effective focal length of the lens, f1 is the focal length of the convex-concave positive lens L1, and f2 is the focal length of the convex-concave positive lens L2.
Preferably, the object plane side of the convex-concave positive lens L2 is provided with a diaphragm.
Preferably, the convex-concave positive lens L1 is a glass lens having a refractive index greater than 1.95.
Preferably, the convex-concave positive lens L2 is a glass lens having an abbe number greater than 90.
Preferably, the second glue set and the third glue set are both negative focal lengths.
Preferably, the working wavelength band of the long-focus large-aperture monitoring lens is 435-656 nm of visible light or below 850nm of near infrared light.
Preferably, an optical filter is further provided on the image plane side of the convex-concave positive lens L9.
Preferably, the biconvex positive lens L3 is a heavy phosphorus crown glass.
Preferably, each lens is a spherical lens.
Preferably, the convex-concave positive lens L1, the convex-concave positive lens L2, the biconvex positive lens L3, the biconcave negative lens L4, the convex-concave negative lens L5, the convex-concave positive lens L6, the convex-concave positive lens L7, the biconcave negative lens L8 and the convex-concave positive lens L9 respectively have focal lengths which are 100(1 +/-5%), 50(1 +/-5%), 28(1 +/-5%), -29(1 +/-5%), -12(1 +/-5%), 14(1 +/-5%), 15(1 +/-5%), -7(1 +/-5%) and 26(1 +/-5%); the values of the refractive indexes which correspond to each other in sequence are respectively 2(1 +/-5%), 1.45(1 +/-5%), 1.6(1 +/-5%), 1.8(1 +/-5%), 1.85(1 +/-5%), 1.6(1 +/-5%), 1.9(1 +/-5%), 1.8(1 +/-5%) and 1.6(1 +/-5%); the values of the curvature radiuses of the object sides corresponding to each other in sequence are respectively 44(1 +/-5%), 20(1 +/-5%), 19(1 +/-5%), -100(1 +/-5%), 42(1 +/-5%), 8(1 +/-5%), -270(1 +/-5%), -14(1 +/-5%) and 14(1 +/-5%); the values of the curvature radii of the image side surfaces corresponding to each other in sequence are 75(1 +/-5%), 170(1 +/-5%), -100(1 +/-5%), 33(1 +/-5%), 8(1 +/-5%), 135(1 +/-5%), -14(1 +/-5%), 10(1 +/-5%) and 200(1 +/-5%), wherein '-' indicates that the mirror surface is bent to the image side surface.
Compared with the prior art, the invention has the beneficial effects that:
1) the nine-lens type lens is adopted, the focal power and the diaphragm position of each lens group are reasonably distributed, so that the aperture is enlarged, the lens is miniaturized and lightened, and meanwhile, the lens is suitable for the circuit heating and low-temperature environment of an external camera, and the focal plane does not deviate within-40-80 ℃;
2) a plurality of gluing groups are adopted, so that the reduction of chromatic aberration is facilitated, the requirements on assembly and tolerance are reduced, the imaging quality is improved, and the cost is reduced;
3) the material with low dispersion and anomalous relative partial dispersion is selected to correct visible light and near infrared chromatic aberration, so that the dual-purpose of day and night is achieved, and the image resolution is high;
4) the system can realize large-range accurate image monitoring at higher and far positions, is suitable for video monitoring means of large scene and specific target close-up shooting, and can be applied to urban fire control monitoring, urban key target monitoring, urban public security monitoring, airport perimeter security monitoring, factory monitoring and the like.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a MTF curve under the environment of 20 ℃ at normal temperature in accordance with an embodiment of the present invention;
FIG. 3 is a defocus graph under a normal temperature and 20 ℃ environment in accordance with an embodiment of the present invention;
FIG. 4 is a defocus graph in a low temperature-40 deg.C environment according to an embodiment of the present invention;
FIG. 5 is a defocus graph in an environment of 80 ℃ at a high temperature according to an embodiment of the present invention;
FIG. 6 is a graph of the MTF in the near infrared according to one embodiment of the present invention;
FIG. 7 is a MTF curve under the environment of 20 ℃ at normal temperature in the second embodiment of the present invention;
FIG. 8 is a defocus graph at 20 ℃ in the second embodiment of the present invention;
FIG. 9 is a defocus graph in a low temperature-40 deg.C environment according to the second embodiment of the present invention;
FIG. 10 is a defocus graph in an environment of 80 ℃ at high temperature according to the second embodiment of the present invention;
FIG. 11 is a graph of the MTF in the near infrared according to the second embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is to be noted that, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
Example 1:
as shown in fig. 1 to 6, a long-focus large-aperture monitor lens includes a convex-concave positive lens L1, a convex-concave positive lens L2, a biconvex positive lens L3, a biconcave negative lens L4, a convex-concave negative lens L5, a convex-concave positive lens L6, a convex-concave positive lens L7, a biconcave negative lens L8, and a convex-concave positive lens L9, which are arranged in this order along a light incident direction, wherein:
a double convex positive lens L3 and a double concave negative lens L4 form a first glue combination;
the convex-concave negative lens L5 and the convex-concave positive lens L6 form a second cemented group;
the concave-convex positive lens L7 and the double-concave negative lens L8 form a third glue combination;
the long-focus large-aperture monitoring lens further meets the following conditions:
TTL/f<1，1.5<f1/f<2.5，0.7<f2/f<1.3
wherein TTL is the total lens length, f is the effective focal length of the lens, f1 is the focal length of the convex-concave positive lens L1, and f2 is the focal length of the convex-concave positive lens L2.
The monitoring lens consists of nine lenses which are sequentially distributed along the incident direction of light rays, and through reasonable distribution of focal power of each lens, under the conditions that TTL/f is less than 1, 1.5 is less than f1/f is less than 2.5, and 0.7 is less than f2/f is less than 1.3, clear imaging is met, and meanwhile, the aperture is increased, the clear aperture is large, the light transmission amount is larger, and the image quality is better. A plurality of gluing groups are adopted, each gluing group is glued by photosensitive glue, if UV glue is adopted, chromatic aberration of light with different wavelengths is corrected, chromatic dispersion of each lens can be compensated, so that comprehensive chromatic aberration is minimized, assembling and tolerance requirements are reduced, focus drift of the lens in visible light and near infrared light bands is greatly reduced, day and night confocal is realized, imaging definition and color authenticity are improved, cost is reduced, near infrared imaging at night does not need to be focused again, and meanwhile, materials with low chromatic dispersion and abnormal relative partial chromatic dispersion can be selected for each lens to further correct chromatic aberration of visible light and near infrared light. And corrects various aberrations, mainly spherical aberration, generated accompanying focusing, thereby achieving good optical performance. Meanwhile, the positive and negative focal length values of each lens are reasonably distributed, a non-thermalization design can be realized by selecting a proper glass material, the problem of optimized balance between high and low temperature focal drift and normal temperature resolving power is solved, the high and low temperatures are not out of focus, the high and low temperature focusing lens is suitable for the circuit heating and low temperature environment of an external camera, and is suitable for the temperature environment of-40-80 degrees, and the imaging quality and resolution are high. The system can realize large-range accurate image monitoring at higher and far positions, is suitable for video monitoring of large scenes and specific target close-up shooting, and can be applied to urban fire control monitoring, urban key target monitoring, urban public security monitoring, airport perimeter security monitoring, factory monitoring and the like.
In one embodiment, the object plane side of the convex-concave positive lens L2 is provided with a diaphragm.
Wherein, the object plane side of the convex-concave positive lens L2 is provided with a diaphragm, and the front position of the diaphragm is beneficial to reducing the aperture of the lens, thereby realizing miniaturization and light weight. The stop may be provided between the convex-concave positive lens L1 and the convex-concave positive lens L2 or on the object plane side of the convex-concave positive lens L1.
In one embodiment, the convex-concave positive lens L1 is a glass lens with a refractive index greater than 1.95.
The convex-concave positive lens L1 is a glass lens with refractive index greater than 1.95, so that spherical aberration caused by a telephoto lens can be corrected, and imaging quality is improved.
In one embodiment, convex-concave positive lens L2 is a glass lens with an abbe number greater than 90.
The convex-concave positive lens L2 is a glass lens with Abbe number greater than 90, which reduces chromatic aberration of lens and improves image quality, and the material is favorable for athermal design of lens.
In an embodiment, the second glue set and the third glue set are both negative focal lengths.
The second cemented group consisting of the convex-concave negative lens L5 and the convex-concave positive lens L6 and the third cemented group consisting of the convex-concave positive lens L7 and the double-concave negative lens L8 are both negative focal lengths, which are beneficial to balancing aberration and improving imaging quality.
In one embodiment, the working wavelength band of the long-focus large-aperture monitoring lens is 435-656 nm of visible light or below 850nm of near infrared light.
The monitoring lens can perform clear imaging of 435-656 nm visible light or 850nm near infrared light.
In one embodiment, the image plane side of the convex-concave positive lens L9 is further provided with an optical filter.
The optical filter is placed on the image surface side of the convex-concave positive lens L9, participates in optical path imaging in daytime, filters near infrared light, is used for reducing photoelectric noise, enables the near infrared light to participate in imaging in night, enhances photosensitive brightness, improves imaging quality and can realize day and night confocal.
In one embodiment, the biconvex positive lens L3 is a heavy phosphorous crown glass.
The biconvex positive lens L3 is made of dense phosphorus crown glass to correct chromatic aberration and improve imaging quality, and the convex-concave positive lens L2 is made of dense phosphorus crown glass. In addition, at least one of the convex-concave positive lens L2 and the biconvex positive lens L3 may be made of other materials having anomalous relative partial dispersion to correct chromatic aberration of visible light and near infrared light.
In one embodiment, each lens is a spherical lens.
Wherein, each lens all adopts spherical lens, and processing and assembly cost are low, stand wear and tear, are applicable to batch production.
In one embodiment, the focal lengths of the convex-concave positive lens L1, the convex-concave positive lens L2, the biconvex positive lens L3, the biconcave negative lens L4, the convex-concave negative lens L5, the convex-concave positive lens L6, the convex-concave positive lens L7, the biconcave negative lens L8 and the convex-concave positive lens L9 correspond to focal lengths of 100(1 ± 5%), 50(1 ± 5%), 28(1 ± 5%), 29(1 ± 5%), -12(1 ± 5%), 14(1 ± 5%), 15(1 ± 5%), -7(1 ± 5%) and 26(1 ± 5%); the values of the refractive indexes which correspond to each other in sequence are respectively 2(1 +/-5%), 1.45(1 +/-5%), 1.6(1 +/-5%), 1.8(1 +/-5%), 1.85(1 +/-5%), 1.6(1 +/-5%), 1.9(1 +/-5%), 1.8(1 +/-5%) and 1.6(1 +/-5%); the values of the curvature radiuses of the object sides corresponding to each other in sequence are respectively 44(1 +/-5%), 20(1 +/-5%), 19(1 +/-5%), -100(1 +/-5%), 42(1 +/-5%), 8(1 +/-5%), -270(1 +/-5%), -14(1 +/-5%) and 14(1 +/-5%); the values of the curvature radii of the image side surfaces corresponding to each other in sequence are 75(1 +/-5%), 170(1 +/-5%), -100(1 +/-5%), 33(1 +/-5%), 8(1 +/-5%), 135(1 +/-5%), -14(1 +/-5%), 10(1 +/-5%) and 200(1 +/-5%), wherein '-' indicates that the mirror surface is bent to the image side surface.
When the focal length, the refractive index and the curvature radius of each lens are within the above ranges, the aperture is enlarged, and the lens is beneficial to realizing the miniaturization, the light weight and the clear imaging.
Further, as shown in fig. 2 to 6, the optical parameters of each lens in this embodiment, including the curvature radius, the thickness, the refractive index and abbe number of the material, and the focal length, are as follows:
wherein, the light incidence direction, i.e. the direction from the object plane to the image plane, is sequentially numbered for the mirror surfaces of the lenses, R1 is the object side surface of the convex-concave positive lens L1, R2 is the image side surface of the convex-concave positive lens L1, R1 is the object side surface of the biconvex positive lens L1, R1 is the image side surface of the biconvex positive lens L1 and the object side surface of the biconcave negative lens L1, R1 is the image side surface of the convex-concave negative lens L1 and the object side surface of the convex-concave positive lens L1, R1 is the object side surface of the negative lens L1, R1 is the image side surface of the negative lens L1 and the object side surface of the convex-concave positive lens L1, R1 is the object side surface of the convex-concave positive lens L1, R1 and the object side surface of the convex-concave positive lens L1 are the convex-concave positive lens L1, R1 and the object side surface of the convex-concave lens L1, r13 is the image side surface of the double concave negative lens L8, R14 is the object side surface of the convex-concave positive lens L9, R15 is the image side surface of the convex-concave positive lens L9, and "-" indicates that the mirror surface direction is curved toward the image surface side.
In this embodiment, the effective focal length of the lens is 53.8mm, the F-number is 1.8, the full field angle is 9.2 °, and the maximum image plane Φ is 8.82 mm. As shown in FIG. 2, the MTF curves in the fields all decline smoothly, the MTF value of the central field reaches 0.47 at 250lp/mm, the MTF value of the edge field is greater than 0.25, and the imaging effect and the resolution of the lens are good. As shown in the defocus curve of fig. 3, the curves in each field are concentrated and the defocus is small. As shown in FIGS. 4 and 5, the MTF curve surface at high and low temperatures can not defocus in the temperature range of-40 deg.C to 80 deg.C. As shown in fig. 6, the near-infrared MTF curve is smooth, the MTF value of each field under 250lp/mm is greater than 0.2, the near-infrared imaging lens can be used for near-infrared imaging, day and night confocal imaging is realized, the lens can be used for monitoring at night, imaging is clear, imaging quality is high, and the requirements of long focal length and large aperture are met.
Example 2:
as shown in fig. 1 and fig. 7 to 11, based on the solutions of the first embodiment, the differences are that the optical parameters of each lens in this embodiment, including the radius of curvature, the thickness, the refractive index and abbe number of the material, and the focal length, take the following values:
wherein, the light incidence direction, i.e. the direction from the object plane to the image plane, is sequentially numbered for the mirror surfaces of the lenses, R1 is the object side surface of the convex-concave positive lens L1, R2 is the image side surface of the convex-concave positive lens L1, R1 is the object side surface of the biconvex positive lens L1, R1 is the image side surface of the biconvex positive lens L1 and the object side surface of the biconcave negative lens L1, R1 is the image side surface of the convex-concave negative lens L1 and the object side surface of the convex-concave positive lens L1, R1 is the object side surface of the negative lens L1, R1 is the image side surface of the negative lens L1 and the object side surface of the convex-concave positive lens L1, R1 is the object side surface of the convex-concave positive lens L1, R1 and the object side surface of the convex-concave positive lens L1 are the convex-concave positive lens L1, R1 and the object side surface of the convex-concave lens L1, r13 is the image side surface of the double concave negative lens L8, R14 is the object side surface of the convex-concave positive lens L9, R15 is the image side surface of the convex-concave positive lens L9, and "-" indicates that the mirror surface direction is curved toward the image surface side.
In this embodiment, the effective focal length of the lens is 53.9mm, the F-number is 1.8, the full field angle is 9.2 °, and the maximum image plane Φ is 8.82 mm. As shown in FIG. 7, the MTF curves in the fields all decline smoothly, the MTF value in the central field reaches 0.48 at 250lp/mm, the MTF value in the edge field is greater than 0.28, and the imaging effect and the resolution of the lens are good. As shown in the defocus curve of fig. 8, the curves in each field are concentrated and the defocus is small. As shown in FIGS. 9 and 10, the MTF curve surface at high and low temperatures can not defocus in the temperature range of-40 deg.C to 80 deg.C. As shown in fig. 11, the near-infrared MTF curve is smooth, the MTF value of each field under 250lp/mm is greater than 0.21, the near-infrared confocal imaging system can be used for near-infrared imaging, day and night confocal imaging is realized, the lens can be used for monitoring at night, imaging is clear, imaging quality is high, and the requirements of long focal length and large aperture are met.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express the more specific and detailed embodiments described in the present application, but not should be understood as the limitation of the invention claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides a big light ring monitor lens of long focal length which characterized in that: the long-focal-length large-aperture monitoring lens comprises a convex-concave positive lens L1, a convex-concave positive lens L2, a biconvex positive lens L3, a biconcave negative lens L4, a convex-concave negative lens L5, a convex-concave positive lens L6, a convex-concave positive lens L7, a biconcave negative lens L8 and a convex-concave positive lens L9 which are sequentially arranged along the light incidence direction, wherein:
the double convex positive lens L3 and the double concave negative lens L4 form a first glue combination;
the convex-concave negative lens L5 and the convex-concave positive lens L6 form a second cemented group;
the concave-convex positive lens L7 and the double-concave negative lens L8 form a third glue combination;
the long-focus large-aperture monitoring lens further meets the following conditions:
TTL/f<1，1.5<f1/f<2.5，0.7<f2/f<1.3
wherein, TTL is the total lens length, f is the effective focal length of the lens, f1 is the focal length of the convex-concave positive lens L1, and f2 is the focal length of the convex-concave positive lens L2.
2. The long focal length large aperture monitor lens of claim 1, wherein: and a diaphragm is arranged on the object plane side of the convex-concave positive lens L2.
3. The long focal length large aperture monitor lens of claim 1, wherein: the convex-concave positive lens L1 is a glass lens with a refractive index greater than 1.95.
4. The long focal length large aperture monitor lens of claim 1, wherein: the convex-concave positive lens L2 is a glass lens with an Abbe number larger than 90.
5. The long focal length large aperture monitor lens of claim 1, wherein: the second gluing set and the third gluing set are both negative focal lengths.
6. The long focal length large aperture monitor lens of claim 1, wherein: the working wavelength band of the long-focus large-aperture monitoring lens is 435-656 nm of visible light or below 850nm of near infrared light.
7. The long focal length large aperture monitor lens of claim 1, wherein: the image surface side of the convex-concave positive lens L9 is also provided with an optical filter.
8. The long focal length large aperture monitor lens of claim 1, wherein: the biconvex positive lens L3 was a heavy phosphorus crown glass.
9. The long-focus large-aperture monitoring lens according to any one of claims 1 to 8, characterized in that: each of the lenses is a spherical lens.
10. The long focal length large aperture monitor lens of claim 9, wherein: the focal length value ranges of the convex-concave positive lens L1, the convex-concave positive lens L2, the biconvex positive lens L3, the biconcave negative lens L4, the convex-concave negative lens L5, the convex-concave positive lens L6, the convex-concave positive lens L7, the biconcave negative lens L8 and the convex-concave positive lens L9 which correspond in sequence are respectively 100(1 +/-5%), 50(1 +/-5%), 28(1 +/-5%), 29(1 +/-5%), -12(1 +/-5%), 14(1 +/-5%), 15(1 +/-5%), -7(1 +/-5%) and 26(1 +/-5%); the values of the refractive indexes which correspond to each other in sequence are respectively 2(1 +/-5%), 1.45(1 +/-5%), 1.6(1 +/-5%), 1.8(1 +/-5%), 1.85(1 +/-5%), 1.6(1 +/-5%), 1.9(1 +/-5%), 1.8(1 +/-5%) and 1.6(1 +/-5%); the values of the curvature radiuses of the object sides corresponding to each other in sequence are respectively 44(1 +/-5%), 20(1 +/-5%), 19(1 +/-5%), -100(1 +/-5%), 42(1 +/-5%), 8(1 +/-5%), -270(1 +/-5%), -14(1 +/-5%) and 14(1 +/-5%); the values of the curvature radii of the image side surfaces corresponding to each other in sequence are 75(1 +/-5%), 170(1 +/-5%), -100(1 +/-5%), 33(1 +/-5%), 8(1 +/-5%), 135(1 +/-5%), -14(1 +/-5%), 10(1 +/-5%) and 200(1 +/-5%), wherein '-' indicates that the mirror surface is bent to the image side surface.
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| CN104583832A (en) * | 2012-08-29 | 2015-04-29 | 富士胶片株式会社 | Imaging lens and imaging device |
| CN106707475A (en) * | 2016-11-18 | 2017-05-24 | 舜宇光学(中山)有限公司 | Machine vision lens |
| CN210666177U (en) * | 2019-10-30 | 2020-06-02 | 深圳市特莱斯光学有限公司 | Large-target-surface high-definition lens |
| CN213957727U (en) * | 2020-11-04 | 2021-08-13 | 凤凰光学股份有限公司 | Long-focus large-aperture monitoring lens |
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