Medium wave refrigeration infrared lens and optical system

By designing a five-lens secondary imaging mid-wave cooled infrared lens, the problem of increased size and weight caused by large lens aperture was solved, achieving clear imaging of small targets at long distances. The lens structure is compact and adaptable to temperature changes.

CN122410754APending Publication Date: 2026-07-17CHENGDU JINGPIN NIGHT VISION OPTOELECTRONICS TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHENGDU JINGPIN NIGHT VISION OPTOELECTRONICS TECHNOLOGY CO LTD
Filing Date
2026-05-21
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing fixed-focus telephoto lenses have large lens diameters, which increases the size and weight of the lens, making it difficult to achieve clear imaging of distant, small targets.

Method used

Employing a secondary imaging structure, the design incorporates a mid-wave cooled infrared lens composed of five lenses made of silicon and germanium with aspherical surfaces. The lenses can move synchronously, and in conjunction with a 640×512 pixel detector, it achieves clear imaging of small targets at long distances.

Benefits of technology

The lens size and weight have been reduced, enabling clear imaging of small targets at long distances. The lens structure is compact, adapts to temperature changes, and maintains image quality.

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Abstract

本申请提供一种光学系统，包括中波制冷红外镜头及接收该红外镜头所成像的探测器。红外镜头焦距为100mm，F数为4.0，由沿光轴方向依次设置的第一透镜、第二透镜、第三透镜、第四透镜及第五透镜构成，所述第一透镜为凸面朝向物侧的弯月正透镜，所述第二透镜为凸面朝向物侧的弯月负透镜，所述第三透镜为双凸透镜，所述第四透镜为凸面朝向物侧的弯月负透镜，所述第五透镜为双凸透镜，所述红外镜头的一次像面位于所述第二透镜和所述第三透镜之间。该红外镜头采用二次成像，结构紧凑，光学总长为104.99mm，最大口径为31mm，口径和体积较小，并且能够实现远距离、小目标清晰成像。
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