Large-relative-aperture high-resolution long-wave athermalization lens with conformal optical window

Abstract

The invention relates to a large-relative-aperture high-resolution long-wave athermalization lens with a conformal light window, and the lens is sequentially provided with the conformal light window,a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a detector protection light window, and a detector image surface in a light incident direction. The conformal light window is a meniscus negative lens; the first lens and the fourth lens are negative meniscus lenses, and the second lens, the third lens, the fifth lens and the sixth lens are positivemeniscus lenses. The conformal optical window is made of zinc sulfide, the first lens, the second lens and the sixth lens are made of germanium, the third lens and the fifth lens are made of chalcogenide glass IG4, and the fourth lens is made of zinc sulfide. According to the optical system, optical passive athermalization design within the temperature range of -55-70 DEG C is achieved through optical material combination and reasonable distribution of lens focal power; the system has the characteristics of large relative aperture, high resolution, miniaturization, good environmental adaptability and the like, is convenient to install and adjust an optical machine, and is suitable for popularization and application.

Description

technical field [0001] The invention belongs to the field of optical technology, and relates to a large relative aperture high-resolution long-wave athermalization lens with a conformal light window. Background technique [0002] In recent years, with the rapid development of uncooled infrared detector technology and the continuous improvement of detector performance, uncooled infrared passive detection and imaging have become possible, and gradually obtained in the fields of night vision, vehicle night vision and security monitoring. more and more widely used. Domestic uncooled infrared detectors have been mass-produced as long-wave uncooled infrared detectors with a size of 1024×768 and a pixel size of 14 μm, which can meet the needs of high sensitivity and high resolution in military assembly. [0003] The use environment of infrared optical lens is complex. When the ambient temperature changes, the curvature, thickness and spacing of optical components will also change,...

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Problems solved by technology

[0003] The use environment of infrared optical lens is complex. When the ambient temperature changes, the curvature, thickness and spacing of optical components will also change, and the curvature, thickness and spacing of optical components will also change. This series of factors makes the infrared system produce isolation. focus, resulting in a sharp drop in image quality

Infrared optical materials have a high temperature refractive index and are more sensitive to temperature changes. Although the uncooled detection performance is continuously improved, there is still a certain gap in detection sensitivity compared with cooled infrared detectors. In order to further improve and enhance the uncooled The performance of the cooling infrared imaging system puts forward higher requirements for the design of the uncooled infrared optical lens. Therefore, in order to meet the requirements of different environments, an athermal design is required for the uncooled optical lens.

[0004] In specific applications, the optical lens is required to have a certain optical pitch angle. Usually, the infrared light window is a spliced ​​light window, but the material at the seam of the spliced ​​light window cannot pass through the long-wave infrared, and the optical lens will inevitably shrink during the pitching rotation process. Influence to the seam material

[0005] Patent CN206960766U discloses a refraction-diffraction hybrid large relative aperture athermalized infrared objective lens, the optical system F / # is 1; in the prior art, most of F / # are 1, and patent CN209297022U discloses a large field of view large Relative aperture long-wave infrared optical system, F / # can reach up to 0.8, which increases the relative aperture of the optical system, but matching 640×512, 17μm area array of uncooled detectors, currently there is no one in China that can adapt to 1024×768 Large Relative Aperture Athermalized Lens

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