Knob type infrared focusing lens with focal length of 54 mm and assembling method thereof

Abstract

The invention discloses a knob type infrared focusing lens with a focal length of 54 mm and an assembly method thereof. The lens comprises a main lens barrel, and a first meniscus lens and a second meniscus lens which are sequentially arranged in the main lens barrel from an object side to an image side along an optical axis; the convex surface of the first meniscus lens faces the object side, and the convex surface of the second meniscus lens faces the image side; the focal power of the first meniscus lens and the focal power of the second meniscus lens are positive; the working wave band of the infrared focusing lens is 8 [mu] m to 12 [mu] m. According to the invention, aberration correction and balance are carried out on a wide spectrum range of 8 [mu] m to 12 [mu] m, so that the lens has excellent image quality in the wide spectrum range, and wide spectrum confocal is realized; through reasonable matching of focal power and design of an aspheric surface, a knob focusing mode is adopted, high resolution, high passing rate and low distortion can be obtained only by using two lenses, and air change between the lenses at different temperatures is completed to adjust the imaging performance of an optical system; the method is suitable for the long-wave infrared detector with the pixel of 1280X1024.

Description

technical field [0001] The invention belongs to the technical field of optical lenses, and relates to a knob-type infrared focusing lens with a focal length of 54mm and an assembly method thereof. Background technique [0002] With the development of science and technology, infrared imaging technology has been widely used in national defense, industry, medical and other fields. Infrared detection has a certain ability to penetrate smoke, fog, haze, snow, etc. and the ability to identify camouflage. It is not blinded by strong light and flash interference on the battlefield. It can realize long-distance and all-weather observation, especially suitable for night and bad weather conditions. Target detection below. [0003] However, in the application of infrared imaging, the temperature of the external environment will affect the refractive index of the lens material, and will also cause thermal expansion and contraction of the lens barrel material, resulting in a change in op...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above problems in the prior art, the present invention proposes a knob-type infrared focusing lens, which solves the problem that the refractive index of the optical material is affected by the temperature, and solves the change of the optical power caused by the thermal expansion and contraction of the lens barrel material. It has the problem of deviation from the best image plane, and has high-quality imaging effect at -40°C to 60°C. It is suitable for 1280X1024 infrared detectors, and the number of lenses is small, the structure is simple, the installation is convenient, and the focus is easy.

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