CN114911041B - High resolution objective for gun sight - Google Patents
High resolution objective for gun sight Download PDFInfo
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- CN114911041B CN114911041B CN202210478038.4A CN202210478038A CN114911041B CN 114911041 B CN114911041 B CN 114911041B CN 202210478038 A CN202210478038 A CN 202210478038A CN 114911041 B CN114911041 B CN 114911041B
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- lens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/142—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Abstract
The application relates to a high-resolution objective lens for a gun sight, which is characterized in that: the optical system of the objective lens comprises a front lens group A, a diaphragm B and a rear lens group C which are sequentially arranged along the incidence direction of light rays; the front lens group A comprises an orthodontics lens A-1 and a first bonding lens group, wherein the orthodontics lens A-1 and the biconcave lens A-3 are sequentially arranged along the incidence direction of light rays from left to right, the rear lens group C comprises a second bonding lens group, a biconcave lens C-3, a biconvex lens C-4, an orthodontics lens C-5 and a third bonding lens group, wherein the second bonding lens group is sequentially arranged along the incidence direction of light rays from left to right, and is tightly connected with the biconcave lens C-2 through the biconcave lens C-1, and the third bonding lens group is tightly connected with the biconcave lens C-7 through the biconvex lens C-6; aiming at the use requirement of the gun sight, the application provides a wide spectrum lens with a focal length and an entrance pupil ratio of 1, ten spherical lenses are adopted, the total length of the system is less than 48 and mm, the distortion is less than 0.5%, the imaging effect is good, the wide spectrum lens is suitable for a 450-900nm spectrum range, and the wide spectrum lens can be effectively adapted to a severe environment.
Description
Technical Field
The application relates to the field of optical lenses, in particular to a high-resolution objective lens for a gun sight.
Background
In modern war environments, users are sometimes required to be hidden in a place without going round the clock, waiting for targets to appear, and along with the change of the environment, the gun sight is required to adapt to the change;
the common optical system is generally only suitable for occasions with good illumination conditions, and when the optical system is applied to severe environments such as night environments, severe haze, sand dust and the like, a target object is not easy to capture due to weak signals or scattering effects, so that normal use is affected;
the sight is mainly divided into a white light sight used in the daytime and a low-light sight used at night according to the use environment. Along with the development and progress of technology, the sighting device is important in weapon equipment. In order to accommodate the more severe modern war of the environment, a wide spectrum and large aperture collimator is therefore required, which is shared between the day and night, and the objective lens is an important component in the collimator, which must also be met.
Disclosure of Invention
In view of the shortcomings of the prior art, the technical problem to be solved by the application is to provide a high-resolution objective lens for a gun sight, which is applicable to a spectrum range of 450-900nm and has an ultra-large aperture.
In order to solve the technical problems, the technical scheme of the application is as follows: the optical system of the objective lens comprises a front lens group A, a diaphragm B and a rear lens group C which are sequentially arranged along the incidence direction of light rays; the front lens group A comprises an orthodontics lens A-1 and a first bonding lens group, wherein the orthodontics lens A-1 and the biconcave lens A-3 are sequentially arranged along the incidence direction of light rays from left to right, the rear lens group C comprises a second bonding lens group, a biconcave lens C-3, a biconvex lens C-4, an orthodontics lens C-5 and a third bonding lens group, wherein the second bonding lens group is sequentially arranged along the incidence direction of light rays from left to right, and is tightly connected with the biconcave lens C-2 through the biconcave lens C-1, and the third bonding lens group is tightly connected with the biconcave lens C-7 through the biconvex lens C-6.
Further, the front lens group A and the rear lens group C (C-1&C-2&C-3) form a quasi-symmetrical structure about the diaphragm B, so as to be beneficial to correcting coma aberration and astigmatism, and the focal lengths of the front lens group A and the rear lens group C meet the following conditions: fa/fc 1-3 is less than or equal to 0.2 and less than or equal to 0.5.
Further, the ratio of the rear intercept FL of the objective optical system to the effective focal length f of the entire system satisfies: FL/f is more than or equal to 0.1 and less than or equal to 0.5.
Further, the objective optical system is made of H-ZPK5 material with at least two lenses.
Further, the ratio of the focal length fa of the front lens group a to the focal length fc of the rear lens group C satisfies: fa/fc is 6-9.
Further, the biconvex lens C-4, the positive moon lens C-5 and the biconcave lens C-7 have the following refractive indexes at the position of 0.587 um: n is more than or equal to 1.70 and less than or equal to 1.95, and Abbe number satisfies the following conditions: v is more than or equal to 20 and less than or equal to 35.
Further, the maximum image plane matched with the objective lens is 8.62mm, the observation field angle is larger than 22 degrees, the distortion is smaller than 0.5%, and the total length is smaller than 48mm.
Compared with the prior art, the application has the following beneficial effects: (1) having an oversized aperture of 1; (2) The application spectrum range is wide, the wavelength is 450-900nm, and the device can be effectively adapted to various harsh environments (night, severe haze, sand dust and the like); and (3) the distortion is lower and less than 0.5%, and the imaging effect is good.
The application will be described in further detail with reference to the drawings and the detailed description.
Drawings
FIG. 1 is a schematic view of an optical system configuration according to an embodiment of the present application;
FIG. 2 is a graph of the modulation transfer function at room temperature of an optical system according to an embodiment of the present application;
FIG. 3 is a graph of the modulation transfer function at-40℃for an optical system according to an embodiment of the present application;
FIG. 4 is a graph of the modulation transfer function at 65℃for an optical system according to an embodiment of the present application;
FIG. 5 is a graph of optical system distortion for an embodiment of the present application;
FIG. 6 is a graph of relative illuminance of an optical system according to an embodiment of the present application.
In the figure: front lens group A, diaphragm B, rear lens group C, positive moon tooth lens A-1; a lenticular lens A-2; biconcave lens A-3; biconcave lens C-1; a lenticular lens C-2; a lenticular lens C-3; a lenticular lens C-4; a positive crescent lens C-5; a lenticular lens C-6; biconcave lens C-7.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the application. 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.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
As shown in fig. 1 to 6, the high-resolution objective lens optical system for the gun sight comprises a front lens group a, a diaphragm B and a rear lens group C which are sequentially arranged along the incidence direction of light rays; the front lens group A comprises an orthodontics lens A-1 and a first bonding lens group, wherein the orthodontics lens A-1 and the biconcave lens A-3 are sequentially arranged along the incidence direction of light rays from left to right, the rear lens group C comprises a second bonding lens group, a biconcave lens C-3, a biconvex lens C-4, an orthodontics lens C-5 and a third bonding lens group, wherein the second bonding lens group is sequentially arranged along the incidence direction of light rays from left to right, and is tightly connected with the biconcave lens C-2 through the biconcave lens C-1, and the third bonding lens group is tightly connected with the biconcave lens C-7 through the biconvex lens C-6.
In the embodiment of the application, the front lens group A and the rear lens group C (C-1&C-2&C-3) form a similar symmetrical structure with respect to the diaphragm B, so that coma aberration and astigmatism can be corrected, and the focal lengths of the front lens group A and the rear lens group C meet the following requirements: fa/fc 1-3 is less than or equal to 0.2 and less than or equal to 0.5.
In the embodiment of the application, the air interval between the front lens group A and the rear lens group C is 4.21mm.
In the embodiment of the application, the air interval between the orthodontic lens A-1 and the first gluing lens group is 2.44mm; the air interval between the second gluing lens group and the biconvex lens C-3 is 1.37mm; the air interval between the biconvex lens C-3 and the biconvex lens C-4 is 0.1mm; the air interval between the biconvex lens C-4 and the positive moon lens C-5 is 0.1mm; the air interval between the orthodontic lens C-5 and the third gluing lens group is 0.1mm.
In the embodiment of the application, the thickness of the orthodontic lens A-1 is 3.20mm, and the thickness of the first glued lens group is 6.14mm. The thickness of the second gluing lens group is 5.32mm, the thickness of the biconvex lens C-3 is 4.65mm, the thickness of the biconvex lens C-4 is 3.35mm, the thickness of the orthodontic lens C-5 is 2.52mm, and the thickness of the third gluing lens group is 5.20mm.
In the embodiment of the application, the ratio of the rear intercept FL of the objective optical system to the effective focal length f of the whole system is as follows: FL/f is more than or equal to 0.1 and less than or equal to 0.5.
In the embodiment of the application, the lenticular lens A-2, the lenticular lens C-3 and the lenticular lens C-6 in the objective optical system are made of H-ZPK materials.
In the embodiment of the present application, the ratio of the focal length fa of the front lens group a to the focal length fc of the rear lens group C satisfies: fa/fc is 6-9.
In the embodiment of the application, the refractive indexes of the materials of the biconvex lens C-4, the positive moon lens C-5 and the biconcave lens C-7 at the position of the wavelength of 0.587um are as follows: n is more than or equal to 1.70 and less than or equal to 1.95, and Abbe number satisfies the following conditions: v is more than or equal to 20 and less than or equal to 35.
Referring to fig. 2 to 3, the lens is reasonably combined by selecting materials with different thermal characteristics by utilizing the difference between the thermal characteristics of the optical materials, so that defocusing generated by the lens under the influence of temperature and thermal expansion and contraction generated by a mechanical structure are mutually compensated to eliminate the influence of temperature, and an optical athermalization effect in the range of-40 ℃ to 60 ℃ is obtained.
In the embodiment of the application, the modulation transfer function value of the objective optical system at the Nyquist frequency is close to 0.3, and the imaging quality is good
Referring to fig. 6, the relative illuminance of the compact large-format large-aperture lens at the edge is greater than 60%.
In this embodiment, the technical indexes of the implementation of the optical system are as follows:
1. chip size: 1960 x 1200;
2. maximum image plane: 8.62mm;
3. wavelength range: 450-900nm;
4. focal length: 22mm;
5. angle of view: 22 °;
6.F#：1.0；
7. distortion: 0.5%;
8. total optical length: 48mm;
9. rear intercept: 9mm;
10. optical weight: 30g;
the specific parameters of each lens in the optical system of this embodiment are shown in the following table:
any of the above-described embodiments of the present application disclosed herein, unless otherwise stated, if they disclose a numerical range, then the disclosed numerical range is the preferred numerical range, as will be appreciated by those of skill in the art: the preferred numerical ranges are merely those of the many possible numerical values where technical effects are more pronounced or representative. Since the numerical values are more and cannot be exhausted, only a part of the numerical values are disclosed to illustrate the technical scheme of the application, and the numerical values listed above should not limit the protection scope of the application.
If the application discloses or relates to components or structures fixedly connected with each other, then unless otherwise stated, the fixed connection is understood as: detachably fixed connection (e.g. using bolts or screws) can also be understood as: the non-detachable fixed connection (e.g. riveting, welding), of course, the mutual fixed connection may also be replaced by an integral structure (e.g. integrally formed using a casting process) (except for obviously being unable to use an integral forming process).
In addition, terms used in any of the above-described aspects of the present disclosure to express positional relationship or shape have meanings including a state or shape similar to, similar to or approaching thereto unless otherwise stated.
Any part provided by the application can be assembled by a plurality of independent components, or can be manufactured by an integral forming process.
The above description is only a preferred embodiment of the present application, and is not intended to limit the application in any way, and any person skilled in the art may make modifications or alterations to the disclosed technical content to the equivalent embodiments. However, any simple modification, equivalent variation and variation of the above embodiments according to the technical substance of the present application still fall within the protection scope of the technical solution of the present application.
Claims (6)
1. A high resolution objective for a gun sight, characterized by: the optical system of the objective lens sequentially comprises a front lens group A, a diaphragm B and a rear lens group C along the light incidence direction; the front lens group A sequentially consists of an orthodontic lens A-1, a biconvex lens A-2 and a biconcave lens A-3 along the incidence direction of light rays from left to right, the biconvex lens A-2 is closely connected with the biconcave lens A-3 to form a first gluing lens group, and the rear lens group C sequentially consists of a biconcave lens C-1, a biconvex lens C-2, a biconvex lens C-3, a biconvex lens C-4, an orthodontic lens C-5, a biconvex lens C-6 and a biconcave lens C-7 along the incidence direction of light rays from left to right; the concave lens C-1 and the biconvex lens C-2 are closely connected to form a second gluing lens group; the biconvex lens C-6 and the biconcave lens C-7 are closely connected to form a third gluing lens group;
c-1 to C-3 in the front lens group A and the rear lens group C form a quasi-symmetrical structure about the diaphragm B so as to be beneficial to correcting coma aberration and astigmatism, and the focal lengths of the front lens group A and the rear lens group C meet the following conditions: fa/fc 1-3 is less than or equal to 0.2 and less than or equal to 0.5;
the ratio of the focal length fa of the front lens group a to the focal length fc of the rear lens group C satisfies: fa/fc is 6-9.
2. The high resolution objective for a gun sight of claim 1, wherein: the ratio of the rear intercept FL of the objective optical system to the effective focal length f of the entire system satisfies: FL/f is more than or equal to 0.1 and less than or equal to 0.5.
3. The high resolution objective for a gun sight of claim 1, wherein: at least two lenses of the objective optical system are made of H-ZPK material.
4. The high resolution objective for a gun sight of claim 1, wherein: the biconvex lens C-4, the positive moon lens C-5 and the biconcave lens C-7 have the following refractive indexes at the position of 0.587 um: n is more than or equal to 1.70 and less than or equal to 1.95, and Abbe number satisfies the following conditions: v is more than or equal to 20 and less than or equal to 35.
5. The high resolution objective for a gun sight of claim 1, wherein: the maximum image plane of the objective lens is 8.62 and mm, the observation field angle is larger than 22 degrees, the distortion is smaller than 0.5%, and the total length is smaller than 48mm.
6. The high resolution objective for a gun sight of claim 1, wherein: the air interval between the front lens group A and the rear lens group C is 4.21 mm; the air interval between the orthodontic lens A-1 and the first bonding lens group is 2.44 and mm; the air interval between the second gluing lens group and the biconvex lens C-3 is 1.37mm; the air gap between the lenticular lens C-3 and the lenticular lens C-4 is 0.1mm; the air interval between the biconvex lens C-4 and the positive moon lens C-5 is 0.1mm; the air space between the orthodontic lens C-5 and the third cemented lens group is 0.1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210478038.4A CN114911041B (en) | 2022-04-29 | 2022-04-29 | High resolution objective for gun sight |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210478038.4A CN114911041B (en) | 2022-04-29 | 2022-04-29 | High resolution objective for gun sight |
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| Publication Number | Publication Date |
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| CN114911041A CN114911041A (en) | 2022-08-16 |
| CN114911041B true CN114911041B (en) | 2023-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210478038.4A Active CN114911041B (en) | 2022-04-29 | 2022-04-29 | High resolution objective for gun sight |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11231215A (en) * | 1998-02-19 | 1999-08-27 | Fuji Xerox Co Ltd | Image forming lens |
| CN203250060U (en) * | 2013-02-20 | 2013-10-23 | 福建福光数码科技有限公司 | Three-mega-pixel day and night P-iris lens |
| CN103389562A (en) * | 2013-08-15 | 2013-11-13 | 福建福光数码科技有限公司 | 5 mega-pixel micro camera lens with large target surface |
| CN107884907A (en) * | 2016-09-29 | 2018-04-06 | 富士胶片株式会社 | Imaging len and Optical devices |
| CN110955021A (en) * | 2020-02-28 | 2020-04-03 | 福建福光股份有限公司 | Compact type medium and long-focus optical system with large relative aperture and working method thereof |
-
2022
- 2022-04-29 CN CN202210478038.4A patent/CN114911041B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11231215A (en) * | 1998-02-19 | 1999-08-27 | Fuji Xerox Co Ltd | Image forming lens |
| CN203250060U (en) * | 2013-02-20 | 2013-10-23 | 福建福光数码科技有限公司 | Three-mega-pixel day and night P-iris lens |
| CN103389562A (en) * | 2013-08-15 | 2013-11-13 | 福建福光数码科技有限公司 | 5 mega-pixel micro camera lens with large target surface |
| CN107884907A (en) * | 2016-09-29 | 2018-04-06 | 富士胶片株式会社 | Imaging len and Optical devices |
| CN110955021A (en) * | 2020-02-28 | 2020-04-03 | 福建福光股份有限公司 | Compact type medium and long-focus optical system with large relative aperture and working method thereof |
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| CN114911041A (en) | 2022-08-16 |
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