Medium-wave infrared refrigerated lens with long focal length and large aperture

A cooling type, long focal length technology, applied in the field of lens, can solve the problems of inability to meet long-distance observation, short focal length of lens, short working distance, etc., to achieve the effect of eliminating cold reflection effect, increasing natural frequency, and increasing wall thickness

Active Publication Date: 2013-10-23
FUJIAN FORECAM OPTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The focal length of the lens is short, the aperture is small, and the operating distance of the system is short, which cannot meet the needs of long-distance observation

Method used

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  • Medium-wave infrared refrigerated lens with long focal length and large aperture
  • Medium-wave infrared refrigerated lens with long focal length and large aperture
  • Medium-wave infrared refrigerated lens with long focal length and large aperture

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Embodiment Construction

[0019] Such as figure 1 As shown, a medium-wave infrared cooling type long-focus, large-diameter lens, the optical system of the lens is provided with a front group A and a rear group B in sequence along the incident direction of light from left to right, and the front group A is sequentially set There are protective sheet 4, positive lens A-1, positive lens A-2 and negative lens A-3, and the rear group B is provided with positive lens B-1 and positive lens B-2 in sequence.

[0020] In this embodiment, along the light incident direction, the protective sheet 4 in the front group A is placed at an inclination of 4°; the air gap between the front group A and the rear group B is 253mm; The air interval between the protective sheet 4 and the positive lens A-1 is 3 mm, the air interval between the positive lens A-1 and the positive lens A-2 is 74 mm, and the air interval between the positive lens A-2 and the negative lens A-3 is 3 mm. The air space between them is 5 mm; the air sp...

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Abstract

The invention relates to a medium-wave infrared refrigerated lens with long focal length and large aperture. A front unit A and a rear unit B are sequentially arranged in an optical system of the lens along the left-to-right light incidence direction, the front unit A is sequentially provided with a protective sheet, a positive lens A-1, a positive lens A-2 and a negative lens A-3, and the rear unit B is sequentially provided with a positive lens B-1 and a positive lens B-2. The medium-wave infrared refrigerated lens has the characteristics of high imaging quality, high spatial resolution, small volume, vibration and impact resistance, and the like; in an optical structure, the optical focal power of the front unit A and the rear unit B is allocated reasonably; the rear unit B adopts two aspheric faces, so that the lens can reach the performance indexes of long focal length, large aperture and simple and compact structure; in an optical design, the temperature compensation and far-close compensation are realized through the movement of the positive lens B-1, so as to guarantee the use requirements of the lens in high- and low-temperature environments; the lens can be adapted to a medium-wave infrared refrigerated detector (320*256, 30 microns) so as to carry out live recording and tracking tasks.

Description

technical field [0001] The invention relates to a mid-wave infrared cooling type lens with a long focal length and a large diameter for live recording and tracking, which belongs to the lens field. Background technique [0002] Infrared imaging has a long distance at night; good anti-interference performance; good concealment; intuitive image, easy to observe; environmental adaptability is better than visible light; strong ability to penetrate smoke, dust and haze; It has the advantages of panoramic target observation, tracking and target recognition capabilities, and good anti-target stealth capabilities. Therefore, infrared imaging technology has become a hot spot in the design and development of tracking systems. However, most of the infrared camera lenses currently on the market are short-focus lenses. The focal length of the lens is short, the aperture is small, and the operating distance of the system is short, which cannot meet the needs of long-distance observation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/18G02B13/14G02B13/00G02B7/02
Inventor 林春生汤子鑫陈潇陈鹏
Owner FUJIAN FORECAM OPTICS CO LTD
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