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A Shortwave Infrared Continuous Zoom Lens with Large Zoom Ratio

A short-wave infrared and zoom lens technology, which is applied in optical components, instruments, optics, etc., can solve the problems of short focal length at the telephoto end, weak detection ability of long-distance targets, small zoom ratio, etc., and achieve light weight, cost reduction and Difficulty in processing and small change in focal length value

Active Publication Date: 2021-04-20
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The zoom ratio of the above two short-wave infrared continuous zoom lenses is small, and the focal length of the telephoto end is short, and the detection ability of long-distance targets is weak.

Method used

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  • A Shortwave Infrared Continuous Zoom Lens with Large Zoom Ratio
  • A Shortwave Infrared Continuous Zoom Lens with Large Zoom Ratio
  • A Shortwave Infrared Continuous Zoom Lens with Large Zoom Ratio

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Experimental program
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Effect test

Embodiment

[0100] The short-wave infrared continuous zoom lens of this embodiment has a target surface size of 9.6 mm×7.68 mm, and is suitable for a short-wave infrared uncooled detector whose detector type is InGaAS, whose pixel size is 15 μm, and whose resolution is 640×512. The total length of the lens is 305mm, and the maximum aperture is 86mm. It has the characteristics of high transmittance, low cost, small size and light weight; the working band of the lens is 0.95-1.7μm short-wave infrared band, F#: 3.6-7.3; the focal length is continuous within the range of 17.5-550mm Zoom, horizontal field of view 31.16°~0.98°, suitable for 9.6×7.68mm short-wave infrared detector.

[0101] The specific implementation of each optical component in this embodiment is as follows:

[0102] The front fixed group 1 includes a first negative lens 11, a first double-convex positive lens 12, and a second double-convex positive lens 13 arranged in sequence from left to right; the concave surface of the fi...

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Abstract

The invention provides a short-wave infrared continuous zoom lens with a large zoom ratio to meet the needs of large-scale detection of long-distance targets and detailed inspection of small field of view. The present invention comprises a front fixed group with positive refractive power, a zoom group with negative refractive power, an aperture diaphragm, a compensation group with positive refractive power and a rear fixed group with positive refractive power arranged coaxially in sequence. The front fixed group can be translated along the optical axis according to the ambient temperature to compensate the thermal difference at the telephoto end of the lens; the zoom group and compensation group can be translated along the optical axis to realize continuous zoom imaging. The present invention adopts the structural form of positive group compensation and root replacement, realizes fast zooming from large field of view to ultra-small field of view, and realizes continuous zooming with large zoom ratio of 31 times, and has the characteristics of simple zoom structure and compact structure.

Description

technical field [0001] The invention relates to the technical field of short-wave infrared imaging, in particular to a short-wave infrared continuous zoom lens with a large zoom ratio. Background technique [0002] The light energy in the short-wave infrared band (0.9-1.7 μm) has a high transmittance under conditions such as fog, rain, and dust with low visibility, and the spectral radiation of the night sky is concentrated in the short-wave infrared band under the conditions of the full moon and atmospheric glow. Therefore, the short-wave infrared imaging system can clearly image objects under low-illumination conditions, low-visibility fog, rain, dust and other conditions. At the same time, short-wave infrared imaging has very high application value in the fields of fire point detection, rainstorm and tornado early warning, and camouflage recognition. However, most of the short-wave infrared lenses currently used are fixed-focus lenses, which cannot meet the application r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/173
CPCG02B15/173
Inventor 马迎军高波陈卫宁张洪伟梅超闫阿奇曲锐
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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