Longwave Infrared Mechanical Passive Athermalized Lens and Its Compensation Adjustment Method

A long-wave infrared, passive technology, applied in the direction of installation, optics, instruments, etc., can solve the problems of image quality degradation, optical system focal length change, image plane drift, etc., and achieve the effect of compact structure, high resolution, and small distortion

Active Publication Date: 2017-10-03
FUJIAN FORECAM OPTICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because infrared optical materials and mechanical materials will produce thermal deformation when the temperature changes, the drastic change of working temperature will cause the focal length change of the optical system, the image surface is elegant, and the image quality is reduced.

Method used

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  • Longwave Infrared Mechanical Passive Athermalized Lens and Its Compensation Adjustment Method
  • Longwave Infrared Mechanical Passive Athermalized Lens and Its Compensation Adjustment Method

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] Such as Figure 1~2 As shown, a long-wave infrared mechanically passive athermalized lens, the optical system of the lens is provided with a front group A of the lens group with a negative refractive power and a lens with a positive refractive power in sequence along the incident direction of the light from left to right In the rear group B, the front group A includes crescent-shaped lenses A-1 sequentially arranged from left to right; the rear group B includes negative crescent-shaped lenses B-1 and crescent-shaped lenses B-2.

[0020] In this embodiment, the air gap between the negative crescent lens B-1 and the crescent lens B-2 in the rear group B is 2.9mm, and the air gap between the front group A and the rear group B is 4.9mm.

[0021] In this embodiment, the mechanical structure of the lens includes a front group and a rear grou...

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Abstract

The invention relates to a long-wave infrared mechanically passive athermal lens. The optical system of the lens is sequentially provided with a lens group A with a negative focal power and a lens with a positive focal power along the incident direction of light from left to right. In the rear group B, the front group A includes crescent-shaped lenses A-1 sequentially arranged from left to right; the rear group B includes negative crescent-shaped lenses B-1 and crescent-shaped lenses B-2. The long-wave infrared mechanical passive athermal lens has the advantages of large relative aperture, IP67 waterproof and dustproof, low distortion, and athermal compensation; the use of thermal expansion and contraction characteristics of materials and the application of compensation shrapnel makes the athermal design structure more efficient. Simple, the structure of the overall product is smaller, the weight is lighter, the optical axis is stable, the image is clearer, and the reliability is high. In terms of meeting the user's requirements for product imaging performance, the structure is also more convenient for customers to use.

Description

technical field [0001] The invention relates to the technical field of optical lens devices, in particular to a long-wave infrared mechanically passive athermalized lens and a compensation adjustment method thereof. Background technique [0002] With the rapid development of science and technology and the continuous development and maturity of uncooled detector technology, long-wave infrared uncooled optical systems have been widely used in military and civilian fields. Since infrared optical materials and mechanical materials will produce thermal deformation when the temperature changes, drastic changes in operating temperature will cause changes in the focal length of the optical system, image surface drift, and image quality degradation. In order to eliminate or reduce the impact of temperature changes on the imaging of the optical system, corresponding compensation techniques must be used to keep the focal length of the optical system constant within a large temperature ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B7/02
CPCG02B7/021G02B7/023G02B7/028
Inventor 刘涛郑勇强周阳
Owner FUJIAN FORECAM OPTICS CO LTD
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