Miniaturized medium-wave refrigeration infrared continuous zooming optical system with focal length of 15mm-250mm

Abstract

The invention discloses a miniaturized medium-wave refrigeration infrared continuous zooming optical system with a focal length of 15-250 mm. The miniaturized medium-wave refrigeration infrared continuous zooming optical system comprises a front fixing group, a zooming group, a compensation group, a rear fixing group and a secondary imaging lens group which are sequentially arranged along a light path propagation direction, the front fixing group is a first lens with positive diopter and is made of a silicon material; the zoom group is a second lens with negative diopter and is made of a single crystal germanium material; the compensation group is a third lens with positive diopter and is made of a silicon material; the rear fixing group is composed of a fourth lens with positive diopter and a fifth lens with negative diopter, the fourth lens is made of a silicon material, and the fifth lens is made of a single crystal germanium material; the secondary imaging lens group is a sixth lens with positive diopter and is made of a silicon material; the air interval between the front fixing group and the zooming group is 15.2-35.1 mm; the air interval between the zoom group and the compensation group is 35.7 to 2.1 mm; and the air interval between the compensation group and the rear fixing group is 2-17.8 mm. The number of lenses is small, and the total length is small; large zooming can be realized, and the imaging quality is clear.

Description

technical field [0001] The invention relates to a miniaturized mid-wave cooled infrared continuous zoom optical system with a focal length of 15mm-250mm, which belongs to the field of optical technology. Background technique [0002] In recent years, with the continuous development of infrared technology, various infrared detection materials and component technologies have gradually matured. Infrared technology is widely used in many fields such as civil aviation, security, border defense, industry, construction, transportation, outdoor and automation. [0003] The infrared atmospheric window has three bands, namely 1-3 μm (short wave), 3-5 μm (medium wave) and 8-14 μm (long-wave). The mid-wave infrared detection system plays an important role in monitoring, gas detection and infrared countermeasures. At the same time, mid-wave infrared has great research value in the field of military infrared detection, especially in the fields of infrared thermal imaging and infrared gui...

AI Technical Summary

Problems solved by technology

According to the information, the patent CN202021233714.4 discloses a light and small mid-wave infrared cooling continuous zoom lens, its effective focal length EFL=30~240mm (magnification 8x), and the total length of the optical system=142mm; in addition, the zoom lens disclosed by CN201821513144.7, The number of lenses is as many as 8. These patents disclose that infrared continuous zoom lenses have problems such as large size, small zoom ratio, low system transmittance and high cost caused by too many lenses. This is contrary to the trend of miniaturization of infrared imaging cores.

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