CN114911041A - High resolution objective for gun sights - Google Patents
High resolution objective for gun sights Download PDFInfo
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- CN114911041A CN114911041A CN202210478038.4A CN202210478038A CN114911041A CN 114911041 A CN114911041 A CN 114911041A CN 202210478038 A CN202210478038 A CN 202210478038A CN 114911041 A CN114911041 A CN 114911041A
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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
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Abstract
The invention 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 incident direction of light; the front lens group A comprises a positive crescent lens A-1, a first gluing lens group formed by tightly connecting a biconvex lens A-2 and a biconcave lens A-3, which are sequentially arranged along the incident direction of light from left to right, and the rear lens group C comprises a second gluing lens group formed by tightly connecting a biconcave lens C-1 and a biconvex lens C-2, a biconvex lens C-3, a biconvex lens C-4, a positive crescent lens C-5 and a third gluing lens group formed by tightly connecting a biconvex lens C-6 and a biconcave lens C-7, which are sequentially arranged along the incident direction of light from left to right; the invention provides a wide-spectrum lens with a focal length-entrance pupil ratio of 1 aiming at the use requirement of a gun sight, and the wide-spectrum lens adopts ten spherical lenses, has the total length of the system less than 48mm, the distortion less than 0.5 percent, good imaging effect, is suitable for a spectrum range of 450-plus-900 nm and can effectively adapt to a severe environment.
Description
Technical Field
The invention relates to the field of optical lenses, in particular to a high-resolution objective lens for a gun sight.
Background
The environment of modern war sometimes requires the user to hide in a certain place, wait for the appearance of the target, and 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 lighting conditions, and when the common optical system is applied to severe environments such as night environment, severe haze and dust, weak signals or scattering effect can cause that a target object is not easy to capture, and normal use is influenced;
the sighting device is mainly divided into a white light sighting device used in the day and a low-light sighting device used at night according to the using environment. With the development and progress of technology, sights are a great importance in weaponry. In order to accommodate modern war where the environment is more hostile, a broad spectrum and large aperture sight common to day and night is therefore required, and the objective lens is an important component of the sight, which must also be met.
Disclosure of Invention
In view of the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a high resolution objective lens for a gun sight, which is not only suitable for the spectral range of 450 and 900nm, but also has an ultra-large aperture.
In order to solve the technical problems, the technical scheme of the invention 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 incident direction of light; the front lens group A comprises a positive crescent lens A-1, a first gluing lens group formed by tightly connecting a biconvex lens A-2 and a biconcave lens A-3, which are sequentially arranged along the incident direction of light from left to right, and the rear lens group C comprises a second gluing lens group formed by tightly connecting a biconcave lens C-1 and a biconvex lens C-2, a biconvex lens C-3, a biconvex lens C-4, a positive crescent lens C-5 and a third gluing lens group formed by tightly connecting a biconvex lens C-6 and a biconcave lens C-7, which are sequentially arranged along the incident direction of light from left to right.
Further, the front lens group a and the rear lens group C (C-1& C-2& C-3) form a quasi-symmetric structure with respect to the diaphragm B, so as to facilitate correction of coma and astigmatism, and the focal lengths thereof satisfy: fa/fc 1-3 is not less than 0.2 and not more than 0.5.
Further, the ratio of the back 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, at least two lenses of the objective optical system are made of H-ZPK5 material.
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 more than or equal to 6 and less than or equal to 9.
Further, the biconvex lens C-4, the orthodontic lens C-5 and the biconcave lens C-7 have refractive indexes satisfying that at a wavelength of 0.587 um: n is more than or equal to 1.70 and less than or equal to 1.95, and the Abbe number satisfies: v is more than or equal to 20 and less than or equal to 35.
Furthermore, the maximum image surface matched by the objective lens is 8.62mm, the observation field angle is larger than 22 degrees, the distortion is smaller than 0.5 percent, and the total length is smaller than 48 mm.
Compared with the prior art, the invention has the following beneficial effects: (1) 1, having an ultra-large aperture; (2) the applicable spectrum range is wide, and the spectrum is 900nm, so that the optical fiber can effectively adapt to various severe environments (night, severe haze, sand dust and the like); (3) the distortion is lower, less than 0.5%, and the imaging effect is good.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a schematic diagram of an optical system configuration according to an embodiment of the present invention;
FIG. 2 is a graph of the modulation transfer function of the optical system of the embodiment of the present invention at room temperature;
FIG. 3 is a graph of modulation transfer function at-40 ℃ for an optical system according to an embodiment of the present invention;
FIG. 4 is a graph of modulation transfer function at 65 ℃ for an optical system according to an embodiment of the present invention;
FIG. 5 is a graph of distortion of an optical system according to an embodiment of the present invention;
FIG. 6 is a graph of relative illuminance of an optical system according to an embodiment of the present invention.
In the figure: a front lens group A, a diaphragm B, a rear lens group C and an orthodontic lens A-1; a lenticular lens A-2; a biconcave lens A-3; a 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; a 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 disclosure. 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 example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1 to 6, the high-resolution objective lens for the gun sight includes a front lens group a, a diaphragm B, and a rear lens group C sequentially arranged along a light incidence direction; the front lens group A comprises a positive crescent lens A-1, a first gluing lens group formed by tightly connecting a biconvex lens A-2 and a biconcave lens A-3, which are sequentially arranged along the incident direction of light from left to right, and the rear lens group C comprises a second gluing lens group formed by tightly connecting a biconcave lens C-1 and a biconvex lens C-2, a biconvex lens C-3, a biconvex lens C-4, a positive crescent lens C-5 and a third gluing lens group formed by tightly connecting a biconvex lens C-6 and a biconcave lens C-7, which are sequentially arranged along the incident direction of light from left to right.
In the embodiment of the present invention, the front lens group a and the rear lens group C (C-1& C-2& C-3) form a quasi-symmetric structure with respect to the diaphragm B, which is favorable for correcting coma and astigmatism, and the focal lengths thereof satisfy: fa/fc 1-3 is not less than 0.2 and not more than 0.5.
In the embodiment of the present invention, the air space between the front lens group a and the rear lens group C is 4.21 mm.
In the embodiment of the invention, the air space between the positive crescent lens A-1 and the first cemented lens group is 2.44 mm; the air space between the second cemented lens group and the biconvex lens C-3 is 1.37 mm; the air space between the biconvex lens C-3 and the biconvex lens C-4 is 0.1 mm; the air space between the biconvex lens C-4 and the orthodontic lens C-5 is 0.1 mm; and the air interval between the positive crescent lens C-5 and the third cemented lens group is 0.1 mm.
In the embodiment of the invention, the thickness of the positive crescent lens A-1 is 3.20mm, and the thickness of the first cemented lens group is 6.14 mm. The thickness of the second cemented 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 cemented lens group is 5.20 mm.
In the embodiment of the invention, the ratio of the back intercept FL of the objective optical system to the effective focal length f of the whole system satisfies the following conditions: FL/f is more than or equal to 0.1 and less than or equal to 0.5.
In the embodiment of the invention, the double-convex lens A-2, the double-convex lens C-3 and the double-convex lens C-6 in the objective optical system are made of H-ZPK5 material.
In the embodiment of the present invention, 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 more than or equal to 6 and less than or equal to 9.
In the embodiment of the invention, the biconvex lens C-4, the orthodontic lens C-5 and the biconcave lens C-7 have the refractive indexes of the materials at the wavelength of 0.587um as follows: n is more than or equal to 1.70 and less than or equal to 1.95, and the Abbe number satisfies: v is more than or equal to 20 and less than or equal to 35.
Referring to fig. 2 to 3, by using the difference between the thermal characteristics of the optical materials, the lenses are reasonably combined by selecting materials with different thermal characteristics, so that defocusing generated by the lenses under the influence of temperature and thermal expansion and cold contraction generated by a mechanical structure compensate each other to eliminate the influence of temperature, thereby obtaining the optical athermalization effect within the range of-40 ℃ to 60 ℃.
In the embodiment of the invention, 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 illumination of the compact large-aperture lens at the edge is greater than 60%.
In this embodiment, the optical system achieves the following technical criteria:
1. chip size: 1960 x 1200;
2. maximum image plane: 8.62 mm;
3. wavelength range: 450-900 nm;
4. focal length: 22 mm;
5. the field angle: 22 degrees;
6.F#：1.0；
7. distortion: 0.5 percent;
8. total optical length: 48 mm;
9. rear intercept: 9 mm;
10. optical weight: 30g of the total weight of the mixture;
the specific parameters of each lens in the optical system of this embodiment are shown in the following table:
any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.
If the invention discloses or relates to parts or structures which are fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding) can, of course, also be replaced by one-piece structures (e.g. manufactured in one piece using a casting process) (unless it is obvious that one-piece processes cannot be used).
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (8)
1. A high resolution objective lens for a gun sight, characterized by: 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 incident direction of light; the front lens group A comprises a positive crescent lens A-1, a first gluing lens group formed by tightly connecting a biconvex lens A-2 and a biconcave lens A-3, which are sequentially arranged along the incident direction of light from left to right, and the rear lens group C comprises a second gluing lens group formed by tightly connecting a biconcave lens C-1 and a biconvex lens C-2, a biconvex lens C-3, a biconvex lens C-4, a positive crescent lens C-5 and a third gluing lens group formed by tightly connecting a biconvex lens C-6 and a biconcave lens C-7, which are sequentially arranged along the incident direction of light from left to right.
2. The high resolution objective lens for a gun sight of claim 1, wherein: 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 and astigmatism, 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 not less than 0.2 and not more than 0.5.
3. The high resolution objective lens for a gun sight of claim 2, wherein: the ratio of the back 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.
4. The high resolution objective lens for a gun sight of claim 1, wherein: at least two lenses of the objective optical system are made of H-ZPK5 material.
5. The high resolution objective lens for a gun sight of claim 1, wherein: 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 the following conditions: fa/fc is more than or equal to 6 and less than or equal to 9.
6. The high resolution objective lens for a gun sight of claim 1, wherein: the biconvex lens C-4, the orthodontic lens C-5 and the biconcave lens C-7 have the refractive indexes of the materials at the wavelength of 0.587 um: n is more than or equal to 1.70 and less than or equal to 1.95, and the Abbe number satisfies: v is more than or equal to 20 and less than or equal to 35.
7. The high resolution objective lens for a gun sight of claim 1, wherein: the maximum image surface matched by the objective lens is 8.62mm, the observation field angle is larger than 22 degrees, the distortion is smaller than 0.5 percent, and the total length is smaller than 48 mm.
8. The high resolution objective lens for a gun sight of claim 1, wherein: the air space between the front lens group A and the rear lens group C is 4.21 mm; the air space between the positive crescent lens A-1 and the first cemented lens group is 2.44 mm; the air space between the second cemented lens group and the biconvex lens C-3 is 1.37 mm; the air space between the biconvex lens C-3 and the biconvex lens C-4 is 0.1 mm; the air space between the biconvex lens C-4 and the orthodontic lens C-5 is 0.1 mm; and the air interval between the positive crescent lens C-5 and the third cemented lens group is 0.1 mm.
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 true CN114911041A (en) | 2022-08-16 |
| CN114911041B CN114911041B (en) | 2023-08-11 |
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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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| CN114911041B (en) | 2023-08-11 |
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