CN112666684A - Radiation-resistant wide-angle lens - Google Patents
Radiation-resistant wide-angle lens Download PDFInfo
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- CN112666684A CN112666684A CN202011536624.7A CN202011536624A CN112666684A CN 112666684 A CN112666684 A CN 112666684A CN 202011536624 A CN202011536624 A CN 202011536624A CN 112666684 A CN112666684 A CN 112666684A
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Abstract
The invention relates to a radiation-resistant wide-angle lens, wherein an optical system of the lens comprises a front lens group A, a diaphragm B and a rear lens group C which are sequentially arranged along a light path direction, wherein the front lens group A is sequentially provided with a positive meniscus lens A-1, a negative meniscus lens A-2, a negative meniscus lens A-3, a negative meniscus lens A-4, a positive meniscus lens A-5 and a positive meniscus lens A-6 along an incident light path; the rear lens group C is sequentially provided with a biconvex lens C-1, a negative meniscus lens C-2, a positive meniscus lens C-3 and a biconvex lens C-4 along an incident light path. The radiation-resistant wide-angle lens is simple in structure, and the volume and the weight of the system are reduced by adopting a lightweight design; the wide field angle and the wide field depth range are clear for imaging; the radiation resistance is strong, the service life of the whole system is prolonged, and the system can stably and reliably operate in the external space and other radiation environments for a long time.
Description
Technical Field
The invention relates to a radiation-resistant wide-angle lens, and belongs to the technical field of photoelectric videos.
Background
In an environment with radiation particles, such as outer space, in the environment, electrons, protons and a small amount of high-energy cosmic ray particles can reduce the transmittance of the working waveband of a common optical glass material, so that the transmittance in the working waveband of the whole optical system is reduced, a detector cannot receive an optical signal of a monitoring target, the monitoring capability is influenced, and therefore a common optical lens cannot be suitable for long-term work in the radiation environment. Under these special circumstances, in order to reduce the protection cost for the equipment, it is desirable that the monitoring equipment has a small volume, a larger field of view, a wider monitoring range, a large depth of field, and clear imaging from infinity to a target in a close range.
Disclosure of Invention
In view of the above, the present invention provides a radiation-resistant wide-angle lens with simple structure, small size and strong radiation resistance, which has a large field angle and can form a clear image in a large depth of field.
The invention is realized by adopting the following scheme: a radiation-resistant wide-angle lens comprises an optical system, a front lens group A, a diaphragm B and a rear lens group C, wherein the front lens group A, the diaphragm B and the rear lens group C are sequentially arranged along the direction of an optical path, and the front lens group A is sequentially provided with a positive meniscus lens A-1, a negative meniscus lens A-2, a negative meniscus lens A-3, a negative meniscus lens A-4, a positive meniscus lens A-5 and a positive meniscus lens A-6 along an incident optical path; the rear lens group C is sequentially provided with a biconvex lens C-1, a negative meniscus lens C-2, a positive meniscus lens C-3 and a biconvex lens C-4 along an incident light path.
Further, the air space between the front lens group A and the rear lens group C is 2.0mm, and the air space between the rear lens group C and the image plane is 1.6 mm; in the front lens group A, the air space between the positive meniscus lens A-1 and the negative meniscus lens A-2 is 0.1mm, the air space between the negative meniscus lens A-2 and the negative meniscus lens A-3 is 1.0mm, the air space between the negative meniscus lens A-3 and the negative meniscus lens A-4 is 1.0mm, the air space between the negative meniscus lens A-4 and the positive meniscus lens A-5 is 0.5mm, and the air space between the positive meniscus lens A-5 and the positive meniscus lens A-6 is 1.2 mm; the air space between the double convex lens C-1 and the negative meniscus lens C-2 in the rear lens group C is 0.1mm, the air space between the negative meniscus lens C-2 and the positive meniscus lens C-3 is 0.2mm, and the air space between the positive meniscus lens C-3 and the double convex lens C-4 is 0.1 mm.
Further, the focal length f' of the lens and the focal length f of the front lens group AA' satisfy the relation: f is not less than 20A'/f' is less than or equal to 25; focal length f' of lens and focal length f of rear lens group CC' satisfy the relation: fC '/f' is more than or equal to 2.5 and less than or equal to 3; focal length f of positive meniscus lens A-11' and the length L of the first mirror surface of the lens to the imaging surface on the optical axis satisfies the relation: f is not less than 301'/L is less than or equal to 36; focal length f' of lens and distance L of lens capable of forming image clearly at the nearestObject distanceSatisfy the relation: l isObject distance/ f′≤35。
Compared with the prior art, the invention has the following beneficial effects: the radiation-resistant wide-angle lens is simple in structure, and the volume and the weight of the system are reduced by adopting a lightweight design; the imaging device adopts 10 pieces of fully separated spherical lenses and a full-transmission optical structure, has a larger field angle and a large depth of field range and can image clearly; the Schott radiation-resistant glass is made of radiation-resistant glass LAK9G15 and SF6G05, damage of radiation of electrons, protons, space high-energy rays and particles to an optical lens and a rear-end image sensor can be greatly reduced, the radiation resistance is strong, the service life of the whole system is prolonged, and the Schott radiation-resistant glass can stably and reliably operate in external space and other radiation environments for a long time; by selecting reasonable glass material combination, the radiation-resistant wide-angle lens has good heat difference elimination capability, keeps the imaging quality from being reduced within the temperature range of minus 40 ℃ to plus 60 ℃, and meets the use requirement under the environment with large temperature difference.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to specific embodiments and accompanying drawings.
Drawings
FIG. 1 is a view showing the structure of an optical system of a lens barrel according to the present invention;
FIG. 2 is a distortion plot of an embodiment of the present invention;
FIG. 3 is a graph of MTF for an object distance of the present invention at infinity;
FIG. 4 is a graph of MTF for an object distance of 35mm according to the present invention.
Detailed Description
As shown in fig. 1 to 4, an optical system of a radiation-resistant wide-angle lens includes a front lens group a, a diaphragm B, and a rear lens group C sequentially arranged along a light path direction, wherein the front lens group a is sequentially provided with a positive meniscus lens a-1, a negative meniscus lens a-2, a negative meniscus lens a-3, a negative meniscus lens a-4, a positive meniscus lens a-5, and a positive meniscus lens a-6 along an incident light path; the rear lens group C is sequentially provided with a biconvex lens C-1, a negative meniscus lens C-2, a positive meniscus lens C-3 and a biconvex lens C-4 along an incident light path. The radiation-resistant wide-angle lens adopts 10 fully-separated spherical lenses and a full-transmission optical structure, has a larger field angle, well corrects various aberrations, and realizes clear imaging in a large depth of field range.
In this embodiment, the air space between the front lens group a and the rear lens group C is 2.0mm, and the air space between the rear lens group C and the image plane is 1.6 mm; in the front lens group A, the air space between the positive meniscus lens A-1 and the negative meniscus lens A-2 is 0.1mm, the air space between the negative meniscus lens A-2 and the negative meniscus lens A-3 is 1.0mm, the air space between the negative meniscus lens A-3 and the negative meniscus lens A-4 is 1.0mm, the air space between the negative meniscus lens A-4 and the positive meniscus lens A-5 is 0.5mm, and the air space between the positive meniscus lens A-5 and the positive meniscus lens A-6 is 1.2 mm; the air space between the double convex lens C-1 and the negative meniscus lens C-2 in the rear lens group C is 0.1mm, the air space between the negative meniscus lens C-2 and the positive meniscus lens C-3 is 0.2mm, and the air space between the positive meniscus lens C-3 and the double convex lens C-4 is 0.1 mm.
In this embodiment, the focal length f' of the lens and the focal length f of the front lens group AA' satisfy the relation: f is not less than 20A'/f' is less than or equal to 25; focal length f' of lens and focal length f of rear lens group CC' satisfy the relation: fC '/f' is more than or equal to 2.5 and less than or equal to 3; focal length f of positive meniscus lens A-11' and the length L of the first lens surface (namely the front lens surface of the positive meniscus lens A-1) to the imaging surface on the optical axis satisfy the relation: f is not less than 301'/L is less than or equal to 36; focal length f' of lens and distance L of lens capable of forming image clearly at the nearestObject distanceSatisfy the relation: l isObject distance/ f′≤35。
The specific parameters of each lens in the lens optical system of the invention are as follows:
the optical system composed of the lens achieves the following optical indexes:
1. focal length: f' =1 mm;
2. the field angle: 90 ° × 70 °;
3. clear imaging range: 35mm to infinity;
4. spectral range: 450 nm-700 nm;
5. distortion: distortion is less than or equal to 6 percent;
the lens material of the radiation-resistant wide-angle lens is made of Schott radiation-resistant glass LAK9G15 and SF6G05, so that the damage of radiation of electrons, protons, space high-energy rays and particles to an optical lens and a rear-end image sensor can be greatly reduced, the service life of the whole system is prolonged, and the wide-angle lens can stably and reliably operate in radiation environments such as outer space for a long time; the light weight design is adopted, so that the volume and the weight of the system are reduced; by selecting reasonable glass material combination, the radiation-resistant wide-angle lens has good heat difference elimination capability, keeps the imaging quality from being reduced within the temperature range of minus 40 ℃ to plus 60 ℃, and meets the use requirement under the environment with large temperature difference. The imaging device can be applied to a radiation environment, and has the characteristics of simple structure, small volume, strong radiation resistance, larger field angle and clear imaging in a large field depth range.
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), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
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.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (3)
1. A radiation-resistant wide-angle lens is characterized in that: the optical system of the lens comprises a front lens group A, a diaphragm B and a rear lens group C which are sequentially arranged along the direction of a light path, wherein the front lens group A is sequentially provided with a positive meniscus lens A-1, a negative meniscus lens A-2, a negative meniscus lens A-3, a negative meniscus lens A-4, a positive meniscus lens A-5 and a positive meniscus lens A-6 along an incident light path; the rear lens group C is sequentially provided with a biconvex lens C-1, a negative meniscus lens C-2, a positive meniscus lens C-3 and a biconvex lens C-4 along an incident light path.
2. The radiation tolerant wide-angle lens of claim 1, wherein: the air space between the front lens group A and the rear lens group C is 2.0mm, and the air space between the rear lens group C and the image surface is 1.6 mm; in the front lens group A, the air space between the positive meniscus lens A-1 and the negative meniscus lens A-2 is 0.1mm, the air space between the negative meniscus lens A-2 and the negative meniscus lens A-3 is 1.0mm, the air space between the negative meniscus lens A-3 and the negative meniscus lens A-4 is 1.0mm, the air space between the negative meniscus lens A-4 and the positive meniscus lens A-5 is 0.5mm, and the air space between the positive meniscus lens A-5 and the positive meniscus lens A-6 is 1.2 mm; the air space between the double convex lens C-1 and the negative meniscus lens C-2 in the rear lens group C is 0.1mm, the air space between the negative meniscus lens C-2 and the positive meniscus lens C-3 is 0.2mm, and the air space between the positive meniscus lens C-3 and the double convex lens C-4 is 0.1 mm.
3. The radiation tolerant wide-angle lens of claim 1, wherein: the focal length f' of the lens and the focal length f of the front lens group AA' satisfy the relation: f is not less than 20A'/f' is less than or equal to 25; focal length f' of lens and focal length f of rear lens group CC' satisfy the relation: fC '/f' is more than or equal to 2.5 and less than or equal to 3; focal length f of positive meniscus lens A-11' and the length L of the first mirror surface of the lens to the imaging surface on the optical axis satisfies the relation: f is not less than 301'/L is less than or equal to 36; focal length f' of lens and distance L of lens capable of forming image clearly at the nearestObject distanceSatisfy the relation: l isObject distance/ f′≤35。
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011536624.7A CN112666684B (en) | 2020-12-23 | 2020-12-23 | Radiation-resistant wide-angle lens |
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| CN202011536624.7A CN112666684B (en) | 2020-12-23 | 2020-12-23 | Radiation-resistant wide-angle lens |
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| CN112666684A true CN112666684A (en) | 2021-04-16 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007271695A (en) * | 2006-03-30 | 2007-10-18 | Fujinon Corp | Zoom lens for projection and projection type display device |
| CN107783257A (en) * | 2017-10-26 | 2018-03-09 | 福建福光股份有限公司 | Big scene depth space radioresistance camera lens |
| CN110058384A (en) * | 2019-05-30 | 2019-07-26 | 浙江大华技术股份有限公司 | A kind of camera lens |
| CN209167646U (en) * | 2018-12-03 | 2019-07-26 | 福建福光股份有限公司 | Low distortion wide-angle lens |
| CN111897111A (en) * | 2020-09-02 | 2020-11-06 | 深圳融合光学科技有限公司 | 8mm day and night large-light-transmission large-target-surface prime lens and imaging method thereof |
-
2020
- 2020-12-23 CN CN202011536624.7A patent/CN112666684B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007271695A (en) * | 2006-03-30 | 2007-10-18 | Fujinon Corp | Zoom lens for projection and projection type display device |
| CN107783257A (en) * | 2017-10-26 | 2018-03-09 | 福建福光股份有限公司 | Big scene depth space radioresistance camera lens |
| CN209167646U (en) * | 2018-12-03 | 2019-07-26 | 福建福光股份有限公司 | Low distortion wide-angle lens |
| CN110058384A (en) * | 2019-05-30 | 2019-07-26 | 浙江大华技术股份有限公司 | A kind of camera lens |
| CN111897111A (en) * | 2020-09-02 | 2020-11-06 | 深圳融合光学科技有限公司 | 8mm day and night large-light-transmission large-target-surface prime lens and imaging method thereof |
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| CN112666684B (en) | 2023-01-31 |
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