Infrared lens with high definition, long focal length and long wave

Abstract

The invention discloses an infrared lens with high definition, long focal length and long wave. The infrared lens comprises a front fixed group, a zooming group, a compensating group, a rear fixed group and a detector which are sequentially distributed along an optical axis from the object side to the image side, wherein the front fixed group consists of positive meniscus lenses of which convex surfaces face to the object side; the zooming group consists of biconcave lenses; the compensating group consists of first double convex lenses; the rear fixed group consists of a first negative meniscus lens, a second biconvex lens and a second negative meniscus lens which are sequentially distributed along the incidence direction of light. The infrared lens disclosed by the invention has the advantages that continuous zooming of high zooming ratio (25 to 300mm) can be realized, and a target is found at short focus and is identified at long focus; in addition, the target cannot be lost in the zooming process; the infrared lens can be matched with infrared detectors with high-definition, big area array and long wave and types of 1024*768 and 1280*1280.

Description

technical field [0001] The invention relates to an infrared lens, specifically, a high-definition long-focus long-wave infrared lens. Background technique [0002] The infrared thermal imaging system has many advantages such as good concealment, strong anti-electronic interference ability, intuitive image, easy observation, high precision, and good low-altitude detection performance. The ability to identify camouflage is especially suitable for the detection of targets at night and under complex weather conditions. It has broad application prospects in the fields of warning, reconnaissance and security, and has attracted increasing attention from various scientific research institutions and enterprises. Compared with cooled staring infrared thermal imagers, although there is still a big gap in sensitivity such as temperature resolution, uncooled has some outstanding advantages, such as no need to cool the detector, greatly reduced device cost, power consumption Small, light...

AI Technical Summary

Problems solved by technology

The uncooled long-wave continuous zoom lens in the prior art has defects such as small zoom ratio, short focal length, large F-number, and low resolution of the matching detector. With the rapid development of the industry, infrared detector manufacturers have launched 1024×768, 1280×1280 high-resolution high-definition detectors one after another. However, most of the lenses on the market are designed based on low-resolution detectors and have no connection with high-resolution detectors. Infrared lens with long focal length and large zoom ratio matched with the sensor

The ultra-large zoom ratio continuous zoom infrared lens disclosed in Chinese patent document CN201410094484 cannot match high-resolution high-definition detectors (1024 and above), which is severely limited in high-performance applications

And CN201510253987 discloses a kind of continuous zoom infrared lens that adopts a five-lens mirror system, which cannot realize a large zoom ratio infrared lens with a long focal length

According to the above limitations, it is very difficult to design long focal length, large zoom ratio and high resolution

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