Optical compensation continuous zooming passive athermalization optical system

Abstract

The invention provides an optical compensation continuous zooming passive athermalization optical system, and aims at providing an optical structure which can achieve optical passive athermalization between minus 45 DEG C and 60 DEG C and is suitable for a near-infrared band (0.6 micrometer-1.0 micrometer). The technical scheme of the system is achieved through the facts including that in a lens barrel optical system, a front fixed lens group (7), a front zoom lens group (6), a fixed lens group (5), a rear zoom lens group (4), an aperture diaphragm (3) and a rear fixed lens group (2) are sequentially arranged from an object plane to a focal plane; and in the variable time process, a space between the front zoom lens group and the rear zoom lens group is kept unchanged, a motor fixedly connected to a lens barrel serves as a driving source, zoom lens groups are driven by a gear-guide rail mechanism to move linearly in the direction of an optical axis of the optical system forward and backward, and the front zoom lens group and the rear zoom lens group are driven to be in linkage in the optical axis forward and backward in equidistance, constant speed and identical direction manners to achieve continuous change of a focal distance.

Description

technical field [0001] The invention relates to an optical design in the near-infrared band. Specifically, the present invention relates to an optical design using optically compensated continuous zoom with optically passive athermalization. Background technique [0002] When the optical instrument is used in a large temperature range, the thermal expansion and contraction of the lens barrel material, the optical material, and the temperature refractive index coefficient of the optical material will change the focal power of the lens, resulting in defocusing and deteriorating the image quality. The heat difference reduction design of the infrared optical system is to use certain mechanical, optical and electronic technologies to keep the imaging quality of the optical system stable in a wide range of temperature range. The current adiabatic methods mainly include: electromechanical active, mechanical passive and optical passive. The optical passive mode matches the positio...

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Problems solved by technology

[0004] U.S. Patent US3294471 discloses an optical lens based on the principle of optical compensation, which achieves continuous zoom within 5 times by controlling the focal depth, but it does not achieve optical passive athermalization, so manual focusing is required in different temperature environments To ensure image quality

[0005] The technical solution disclosed in U.S. Patent US7092150 also does not realize the athermalization design, and is based on the mid-wave infrared band

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