Small light-weight medium-wave continuous zooming refrigeration infrared optical system

Abstract

The invention discloses a small-sized light-weight medium-wave continuous zooming refrigeration infrared optical system which is composed of a fixed group G1, a zooming group G2, a compensation group G3 and a relay group G4 in sequence from an object space to an image space. The fixed group G1 is composed of a first lens, a second lens and a third lens, wherein the first lens is a lens with positive focal power, the second lens is a lens with negative focal power, and the third lens is a lens with positive focal power; the zooming group G2 is composed of a fourth lens, and the fourth lens is a lens with negative focal power; the compensation group G3 is composed of a fifth lens, and the fifth lens is a lens with positive focal power; the relay group G4 is composed of a sixth lens, a seventh lens and an eighth lens, wherein the sixth lens is a lens with positive focal power, the seventh lens is a lens with negative focal power, and the eighth lens is a lens with positive focal power. The small light-weight medium-wave continuous zooming refrigeration infrared optical system has the advantages of being small in size and light in weight, and the optical system is long in total length and small in diameter.

Description

technical field [0001] The invention relates to a small and light-weight medium-wave continuous zoom cooling infrared optical system, which belongs to the technical field of medium-wave continuous zoom cooling infrared optical system. Background technique [0002] In recent years, infrared thermal imaging technology has developed rapidly and has been widely used in military, industrial and civilian fields. The medium-wave cooling detector has high sensitivity, and its price has obvious advantages compared with the same type of long-wave detectors. It can be matched with a multi-field lens or a continuous zoom lens to realize the search of a large field of view at the short-focus end and the tracking and identification function of a small field of view at the long-focus end. [0003] The existing high-magnification continuous zoom medium-wave cooled optical systems on the market are mainly linear and folded U-shaped structures. The linear type generally has a long overall op...

AI Technical Summary

Problems solved by technology

The straight-line type usually has a long overall optical path to achieve large-magnification zoom, and the whole machine is relatively bulky; the folding U-shaped structure folds the optical path by adding reflectors to reduce the horizontal length, but also increases the longitudinal size of the system, and at the same time, the installation and adjustment of the reflectors is more complicated. Complicated, it is difficult to make the whole machine small and lightweight

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