A medium-wave infrared continuous zoom lens and imaging device

Abstract

The invention discloses a medium-wave infrared continuous zoom lens, in which a front fixed group, a zoom lens group, a compensation lens group, a rear fixed group and a secondary imaging lens group are arranged coaxially from the object side to the image side, and the front The fixed group has positive refractive power, the zoom lens group has negative refractive power, the compensation lens group has positive refractive power, the rear fixed group has positive refractive power, and the secondary imaging lens group has positive refractive power, The zoom lens group and the compensation lens group can move axially to realize continuous zooming. The mid-wave infrared continuous zoom lens has a compact structure and meets the cold aperture efficiency of 100%; the axial movement of the zoom lens group and the compensation lens group realizes the continuous zoom of the system, the zoom stroke is short and the curve is smooth, and the zoom lens can be used in the full focal range It has good image quality.

Description

technical field [0001] The invention relates to the technical field of optical imaging, in particular to a mid-wave infrared continuous zoom lens and an imaging device. 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 phenomenon, while the heat of the lens barrel material Expansion and contraction will also cause the optical system to defocus and degrade the image quality. In order to reduce the impact of temperature changes on the imaging quality of the infrared optical system, an athermal design, or athermal difference design, is required, that is, through certain mechanical, optical and electronic technologies, to compensate the defocus caused by temperature changes, so that The infrared optical system...

AI Technical Summary

Problems solved by technology

However, because the system uses a three-component zoom method, the optical system has a complex structure and requires high control precision, and its first compensation lens 3 is processed with an aspheric surface on the single crystal silicon material, which increases the difficulty of optical processing.

[0005] To sum up, the three-component compact zoom lens has problems such as complex structure and difficult assembly and adjustment; the aspheric surface on the single crystal silicon material increases the difficulty of optical processing

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