CN112462495A - Long-focus small-volume monitoring lens - Google Patents
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- CN112462495A CN112462495A CN202011215625.1A CN202011215625A CN112462495A CN 112462495 A CN112462495 A CN 112462495A CN 202011215625 A CN202011215625 A CN 202011215625A CN 112462495 A CN112462495 A CN 112462495A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 31
- 239000003292 glue Substances 0.000 claims abstract description 13
- 239000011521 glass Substances 0.000 claims description 9
- 230000003287 optical effect Effects 0.000 claims description 9
- 229910052747 lanthanoid Inorganic materials 0.000 claims description 6
- 150000002602 lanthanoids Chemical class 0.000 claims description 6
- 238000004026 adhesive bonding Methods 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 238000003384 imaging method Methods 0.000 description 19
- 230000004075 alteration Effects 0.000 description 13
- 238000013461 design Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000003333 near-infrared imaging Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 125000005647 linker group Chemical group 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000004304 visual acuity Effects 0.000 description 1
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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
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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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
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
- G02B13/146—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation with corrections for use in multiple wavelength bands, such as infrared and visible light, e.g. FLIR systems
Abstract
The invention discloses a long-focus small-volume monitoring lens, which comprises a convex-concave positive lens L1, a biconvex positive lens L2, a biconcave negative lens L3, a convex-concave positive lens L4, a convex-concave positive lens L5, a biconcave negative lens L6, a convex-concave negative lens L7, a biconvex positive lens L8 and a convex-concave negative lens L9 which are sequentially arranged along the incident direction of light rays, wherein: the double convex positive lens L2, the double concave negative lens L3 and the convex-concave positive lens L4 form a first glue combination; the concave-convex positive lens L5 and the double-concave negative lens L6 form a second glue combination; the convex-concave negative lens L7, the biconvex positive lens L8 and the convex-concave negative lens L9 form a third cemented group; the condition is also satisfied: TTL/EFL <0.76, 3.5< EFL/BFL < 4.5. This application is clear formation of image under visible light and near infrared light, reduces bore, compression overall length when realizing long focal length, and small, equipment convenience, with low costs are applicable to remote monitoring and extreme environment.
Description
Technical Field
The invention belongs to the field of optical lenses, and particularly relates to a long-focus small-volume monitoring lens.
Background
Most of monitoring lenses in the market are wide-angle lenses, and the monitoring lenses have the advantages of large aperture, wide monitoring range, capability of imaging day and night and the like, and meet the requirement of security monitoring. However, with the continuous development of the market, more requirements are put forward on the security lens, and the short-distance monitoring cannot meet the social requirements. The long-focus lens has a small field angle and a long monitoring distance, can clearly image a distance, but has a large corresponding volume due to the long focal length. Therefore, it is highly desirable to design a telephoto lens with small volume for day and night imaging.
Disclosure of Invention
The invention aims to solve the problems, provides a long-focus small-size monitoring lens which can correct spherical aberration and chromatic aberration, can clearly image under visible light and near infrared light without focusing, has high imaging quality and resolution, realizes long focus, reduces caliber and compresses total length, has no deviation of focal plane within minus 40-80 ℃, has small size, convenient assembly and low cost, and is suitable for remote monitoring, such as traffic roads and forestry and woodwork.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a long-focus small-volume monitoring lens, which comprises a convex-concave positive lens L1, a biconvex positive lens L2, a biconcave negative lens L3, a convex-concave positive lens L4, a convex-concave positive lens L5, a biconcave negative lens L6, a convex-concave negative lens L7, a biconvex positive lens L8 and a convex-concave negative lens L9 which are sequentially arranged along the incident direction of light rays, wherein:
the double convex positive lens L2, the double concave negative lens L3 and the convex-concave positive lens L4 form a first glue combination;
the concave-convex positive lens L5 and the double-concave negative lens L6 form a second glue combination;
the convex-concave negative lens L7, the biconvex positive lens L8 and the convex-concave negative lens L9 form a third cemented group;
the long-focus small-volume monitoring lens further meets the following conditions:
TTL/EFL<0.76，3.5<EFL/BFL<4.5
wherein, TTL is the total lens length, EFL is the effective focal length of the lens, and BFL optics back focal length.
Preferably, the object plane side of the biconvex positive lens L2 is provided with a diaphragm.
Preferably, the focal length of the second glue set is negative.
Preferably, an optical filter is further disposed on the image plane side of the third bonding group.
Preferably, the working waveband of the long-focus small-volume monitoring lens is 435-656 nm of visible light or below 850nm of near infrared light.
Preferably, the biconvex positive lens L2 is a glass lens having an abbe number greater than 90.
Preferably, the double concave negative lens L6, convex concave negative lens L7, and concave convex negative lens L9 are heavy lanthanide glass lenses.
Preferably, each lens is a spherical lens.
Preferably, the focal lengths of the convex-concave positive lens L1, the biconvex positive lens L2, the biconcave negative lens L3, the convex-concave positive lens L4, the convex-concave positive lens L5, the biconcave negative lens L6, the convex-concave negative lens L7, the biconvex positive lens L8 and the convex-concave negative lens L9 respectively correspond to focal lengths of 39(1 +/-5%), 18.2(1 +/-5%), -8.2(1 +/-5%), 9(1 +/-5%), 9.8(1 +/-5%), -6.5(1 +/-5%), -5(1 +/-5%), 7(1 +/-5%) and-4.5 (1 +/-5%); the values of the refractive indexes which correspond to each other in sequence are respectively 1.59(1 +/-5%), 1.46(1 +/-5%), 1.6(1 +/-5%), 1.65(1 +/-5%), 1.92(1 +/-5%), 1.8(1 +/-5%), 1.85(1 +/-5%), 1.69(1 +/-5%) and 1.98(1 +/-5%); the numerical ranges of the curvature radii of the object sides corresponding to each other in sequence are respectively 20(1 +/-5%), 8.8(1 +/-5%), -96(1 +/-5%), 5.6(1 +/-5%), -120(1 +/-5%), -8.5(1 +/-5%), 82(1 +/-5%), 3.9(1 +/-5%) and-3.9 (1 +/-5%); the values of the curvature radii of the image side surfaces corresponding to each other in sequence are respectively 145(1 +/-5%), -96(1 +/-5%), 5.6(1 +/-5%), 350(1 +/-5%), -8.5(1 +/-5%), 14(1 +/-5%), 3.9(1 +/-5%), -3.9(1 +/-5%) and-30 (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 focal power and the position of the diaphragm are reasonably selected, the aperture can be reduced and the total length can be compressed while the long focal length is realized, and the method is suitable for remote monitoring, such as traffic roads and forest industry;
2) the materials of lanthanide series and large Abbe number are selected to correct the spherical aberration and chromatic aberration of the long-focus lens, so that the image can be clearly formed under visible light and near infrared light without focusing, and the imaging quality and resolution are high;
3) the use of multiple groups of the cemented lens group reduces the requirements on assembly and tolerance while reducing chromatic aberration.
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 small-volume monitoring lens includes a convex-concave positive lens L1, a biconvex positive lens L2, a biconcave negative lens L3, a convex-concave positive lens L4, a convex-concave positive lens L5, a biconcave negative lens L6, a convex-concave negative lens L7, a biconvex positive lens L8, and a convex-concave negative lens L9, which are sequentially arranged in a light incident direction, wherein:
the double convex positive lens L2, the double concave negative lens L3 and the convex-concave positive lens L4 form a first glue combination;
the concave-convex positive lens L5 and the double-concave negative lens L6 form a second glue combination;
the convex-concave negative lens L7, the biconvex positive lens L8 and the convex-concave negative lens L9 form a third cemented group;
the long-focus small-volume monitoring lens further meets the following conditions:
TTL/EFL<0.76，3.5<EFL/BFL<4.5
wherein, TTL is the total lens length, EFL is the effective focal length of the lens, and BFL optics back focal length.
The monitoring lens consists of nine lenses which are distributed in sequence along the light incidence direction, the focal power of each lens is reasonably distributed, under the conditions that TTL/EFL is less than 0.76, 3.5 is less than EFL/BFL is less than 4.5, the total length of the lens is compressed to a smaller value relative to the effective focal length of the lens, so that the caliber and the total length can be reduced under the condition of a long focal length, the requirements of clear imaging are met, the miniaturization and the light weight of the lens are facilitated, and a larger space is reserved for a back focus to facilitate the structural design, such as the design of a lens barrel and the like. Meanwhile, a plurality of gluing groups are adopted, each gluing group is glued by photosensitive glue, if UV glue is adopted, chromatic aberration of light rays 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, and near infrared imaging at night does not need to be focused again. 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, the athermal design is realized, 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 defocused, the method is suitable for the circuit heating and low temperature environment of an external camera, is suitable for the temperature environment of 40-80 degrees, has high imaging quality and resolution, and is suitable for remote monitoring, such as traffic roads and forestry and wood industry.
In one embodiment, the object plane side of the biconvex positive lens L2 is provided with a stop.
The object plane side of the biconvex positive lens L2 is provided with a diaphragm, and the front position of the diaphragm contributes 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 biconvex positive lens L2 or on the object plane side of the convex-concave positive lens L1.
In one embodiment, the focal length of the second glue set is negative.
The second gluing group is a negative focal length, which is beneficial to balancing aberration and improving imaging quality.
In an embodiment, an optical filter is further disposed on the image plane side of the third glue set.
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 working wavelength band of the long-focus small-volume 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 biconvex positive lens L2 is a glass lens having an abbe number greater than 90.
The biconvex positive lens L2 is made of glass lens with Abbe number greater than 90, so as to reduce chromatic aberration of the lens, improve image quality, and facilitate athermal design of the lens.
In one embodiment, double concave negative lens L6, convex concave negative lens L7, and convex concave negative lens L9 are heavy lanthanide glass lenses.
The double-concave negative lens L6, the convex-concave negative lens L7 and the concave-convex negative lens L9 are matched with heavy lanthanide series glass with high refractive index and relatively large Abbe number, can correct spherical aberration and infrared chromatic aberration of the telephoto lens, and are favorable for improving visible light and infrared image quality. According to actual requirements, other lenses can be replaced by heavy lanthanide glass or other materials with high refractive index and relatively large Abbe number.
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 biconvex positive lens L2, the biconcave negative lens L3, the convex-concave positive lens L4, the convex-concave positive lens L5, the biconcave negative lens L6, the convex-concave negative lens L7, the biconvex positive lens L8 and the convex-concave negative lens L9 respectively correspond to focal lengths of 39(1 ± 5%), 18.2(1 ± 5%), -8.2(1 ± 5%), 9(1 ± 5%), 9.8(1 ± 5%), -6.5(1 ± 5%), -5(1 ± 5%), 7(1 ± 5%) and-4.5 (1 ± 5%); the values of the refractive indexes which correspond to each other in sequence are respectively 1.59(1 +/-5%), 1.46(1 +/-5%), 1.6(1 +/-5%), 1.65(1 +/-5%), 1.92(1 +/-5%), 1.8(1 +/-5%), 1.85(1 +/-5%), 1.69(1 +/-5%) and 1.98(1 +/-5%); the numerical ranges of the curvature radii of the object sides corresponding to each other in sequence are respectively 20(1 +/-5%), 8.8(1 +/-5%), -96(1 +/-5%), 5.6(1 +/-5%), -120(1 +/-5%), -8.5(1 +/-5%), 82(1 +/-5%), 3.9(1 +/-5%) and-3.9 (1 +/-5%); the values of the curvature radii of the image side surfaces corresponding to each other in sequence are respectively 145(1 +/-5%), -96(1 +/-5%), 5.6(1 +/-5%), 350(1 +/-5%), -8.5(1 +/-5%), 14(1 +/-5%), 3.9(1 +/-5%), -3.9(1 +/-5%) and-30 (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 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:
the light ray incidence direction, namely 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, R3 is the object side surface of the biconvex positive lens L2, R4 is the image side surface of the biconvex positive lens L4 and the object side surface of the biconcave negative lens L4, R4 is the image side surface of the convex-concave positive lens L4, R4 is the object side surface of the convex-concave positive lens L4, R4 is the image side surface of the convex-concave negative lens L4, R4 is the image side surface of the convex-concave negative lens L4, R4 is the image side surface of the biconvex positive lens L4, R4 and the object side surface of the biconvex positive lens L4, R4 are the curved image side surface of the biconvex positive lens L4, and the object side surface 4.
In this embodiment, the effective focal length of the lens is 40.8mm, the total length of the lens is 30.38mm, 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 in the central field reaches 0.48 at 200lp/mm, the MTF value in 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 curve under each field is very concentrated, the defocus is small, and the maximum field is defocused by 0.01. As shown in FIGS. 4 and 5, the MTF curves at high and low temperatures show that the monitoring lens can not defocus in the temperature range of-40 deg.C to 80 deg.C. As shown in fig. 6, the near-infrared MTF graph is close to the diffraction limit, can be used for near-infrared imaging, realizes day and night confocal, can be used for night monitoring, has clear imaging and high imaging quality, and meets the requirements of long focal length and small volume.
Example 2:
as shown in fig. 1 and fig. 7 to 11, based on the solution of the first embodiment, 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:
the light ray incidence direction, namely 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, R3 is the object side surface of the biconvex positive lens L2, R4 is the image side surface of the biconvex positive lens L4 and the object side surface of the biconcave negative lens L4, R4 is the image side surface of the convex-concave positive lens L4, R4 is the object side surface of the convex-concave positive lens L4, R4 is the image side surface of the convex-concave negative lens L4, R4 is the image side surface of the convex-concave negative lens L4, R4 is the image side surface of the biconvex positive lens L4, R4 and the object side surface of the biconvex positive lens L4, R4 are the curved image side surface of the biconvex positive lens L4, and the object side surface 4.
In this embodiment, the effective focal length of the lens is 40.6mm, the total length of the lens is 30.35mm, 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 of the central field reaches 0.47 at 200lp/mm, the MTF value of the edge field is greater than 0.3, and the imaging effect and the resolution of the lens are good. As shown in the defocus curve of fig. 8, the curve under each field is very concentrated, the defocus is small, and the maximum field is defocused by 0.01. As shown in FIGS. 9 and 10, the MTF curves at high and low temperatures show that the monitoring lens can not defocus in the temperature range of-40 deg.C to 80 deg.C. As shown in fig. 11, the near-infrared MTF graph is close to the diffraction limit, can be used for near-infrared imaging, realizes day and night confocal, can be used for night monitoring, has clear imaging and high imaging quality, and meets the requirements of long focal length and small volume.
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 (9)
1. The utility model provides a little volume monitoring lens of long focal length which characterized in that: the long-focus small-volume monitoring lens comprises a convex-concave positive lens L1, a biconvex positive lens L2, a biconcave negative lens L3, a convex-concave positive lens L4, a convex-concave positive lens L5, a biconcave negative lens L6, a convex-concave negative lens L7, a biconvex positive lens L8 and a convex-concave negative lens L9 which are sequentially arranged along the light incidence direction, wherein:
the double convex positive lens L2, the double concave negative lens L3 and the convex-concave positive lens L4 form a first cemented group;
the concave-convex positive lens L5 and the double-concave negative lens L6 form a second glue combination;
the convex-concave negative lens L7, the double-convex positive lens L8 and the convex-concave negative lens L9 form a third gluing group;
the long-focus small-volume monitoring lens further meets the following conditions:
TTL/EFL<0.76，3.5<EFL/BFL<4.5
wherein, TTL is the total lens length, EFL is the effective focal length of the lens, and BFL optics back focal length.
2. A long focus small volume monitor lens according to claim 1, wherein: and a diaphragm is arranged on the object plane side of the biconvex positive lens L2.
3. A long focus small volume monitor lens according to claim 1, wherein: the focal length of the second glue set is negative.
4. A long focus small volume monitor lens according to claim 1, wherein: and an optical filter is also arranged on the image surface side of the third gluing set.
5. A long focus small volume monitor lens according to claim 1, wherein: the working wavelength band of the long-focus small-volume monitoring lens is 435-656 nm of visible light or below 850nm of near infrared light.
6. A long focus small volume monitor lens according to claim 1, wherein: the double-convex positive lens L2 is a glass lens with an Abbe number larger than 90.
7. A long focus small volume monitor lens according to claim 1, wherein: the double concave negative lens L6, the convex-concave negative lens L7 and the concave-convex negative lens L9 are heavy lanthanide series glass lenses.
8. A long focal length small volume monitor lens according to any one of claims 1 to 7, wherein: each of the lenses is a spherical lens.
9. A long focus small volume monitor lens according to claim 8, wherein: the focal length value ranges of the convex-concave positive lens L1, the biconvex positive lens L2, the biconcave negative lens L3, the convex-concave positive lens L4, the convex-concave positive lens L5, the biconcave negative lens L6, the convex-concave negative lens L7, the biconvex positive lens L8 and the concave-convex negative lens L9 which correspond in sequence are 39(1 +/-5%), 18.2(1 +/-5%), -8.2(1 +/-5%), 9(1 +/-5%), 9.8(1 +/-5%), -6.5(1 +/-5%), -5(1 +/-5%), 7(1 +/-5%) and-4.5 (1 +/-5%); the values of the refractive indexes which correspond to each other in sequence are respectively 1.59(1 +/-5%), 1.46(1 +/-5%), 1.6(1 +/-5%), 1.65(1 +/-5%), 1.92(1 +/-5%), 1.8(1 +/-5%), 1.85(1 +/-5%), 1.69(1 +/-5%) and 1.98(1 +/-5%); the numerical ranges of the curvature radii of the object sides corresponding to each other in sequence are respectively 20(1 +/-5%), 8.8(1 +/-5%), -96(1 +/-5%), 5.6(1 +/-5%), -120(1 +/-5%), -8.5(1 +/-5%), 82(1 +/-5%), 3.9(1 +/-5%) and-3.9 (1 +/-5%); the values of the curvature radii of the image side surfaces corresponding to each other in sequence are respectively 145(1 +/-5%), -96(1 +/-5%), 5.6(1 +/-5%), 350(1 +/-5%), -8.5(1 +/-5%), 14(1 +/-5%), 3.9(1 +/-5%), -3.9(1 +/-5%) and-30 (1 +/-5%), wherein '-' indicates that the mirror surface is bent to the image side surface.
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| CN202011215625.1A CN112462495A (en) | 2020-11-04 | 2020-11-04 | Long-focus small-volume monitoring lens |
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| CN202011215625.1A CN112462495A (en) | 2020-11-04 | 2020-11-04 | Long-focus small-volume monitoring lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113835200A (en) * | 2021-11-25 | 2021-12-24 | 南京万生华态科技有限公司 | Full-frame lens capable of simultaneously covering visible light and near-infrared light |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113835200A (en) * | 2021-11-25 | 2021-12-24 | 南京万生华态科技有限公司 | Full-frame lens capable of simultaneously covering visible light and near-infrared light |
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