Infrared continuous zoom lens with long wave of 25 to 75mm and working method thereof

Abstract

The invention relates to a 25-75mm long-wave infrared continuous zoom lens and its working method. The optical system of the lens is provided with a front solid group lens A, a front variable power group lens B, and a compensation group in sequence along the incident direction of light from front to back. Lens C, rear fixed group lens D, and focusing group lens E, the front fixed group lens A includes a positive crescent lens A-1 with a convex surface facing forward; The crescent lens B-1; the compensation group lens C includes a negative crescent lens C-1 with the concave surface facing forward; the post-fixation lens D includes a positive crescent lens D-1 with a convex surface facing forward and a The negative crescent lens D-2 on the back side of the shaped lens D-1 and the convex surface facing forward; the focusing group lens E includes a positive crescent lens E-1 with the convex surface facing forward. The lens has a small number of aspheric surfaces, which effectively reduces the difficulty and cost of processing, and is easy to guarantee the quality, high resolution and good image quality.

Description

technical field [0001] The invention relates to a 25-75mm long-wave infrared continuous zoom lens and a working method thereof. Background technique [0002] With the rapid development of science and technology and the continuous development and maturity of uncooled detector technology, the long-wave infrared uncooled optical system has many excellent features, such as passive operation, will not be interfered by local electronics, and has good concealment; Intuitive, easy to observe; small size, light weight, high precision, etc., have been widely used in military and civilian fields. The infrared continuous zoom optical system can continuously change the focal length of the system within a certain range. While changing the field of view, the image plane can remain stable and clear without image plane drift. In recent years, with the development of security monitoring, Internet of Things, drone aerial photography and other fields, the demand for the associated infrared con...

AI Technical Summary

Problems solved by technology

[0003] Traditional uncooled infrared zoom lenses have more than 2 aspheric surfaces, even if there are 2 aspheric infrared zoom lenses, the resolution can only reach 20lp / mm. In recent years, some uncooled infrared zoom lenses use multiple aspheric surfaces and a diffractive The high-resolution structure of 5 lenses is realized on the surface, but the diffraction surface is difficult to process, high in cost, unable to be quantified and detected, and the quality cannot be accurately controlled

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