Prime lens used for infrared camera

Abstract

The invention relates to a prime lens used for an infrared camera. The prime lens comprises a first single negative non-spherical lens, a second single negative spherical lens and a third single positive spherical lens. The first single negative non-spherical lens is of a ten-order-coefficient non-spherical design. The second single negative spherical lens is made of sulfur infrared glass. The prime lens used for the infrared camera is simple in structure and convenient to manufacture, meanwhile, improves the imaging effect and reduces manufacturing cost.

Description

technical field [0001] The invention relates to a lens for an infrared camera, in particular to a fixed-focus lens for an infrared camera with simple structure, convenient manufacture, improved imaging effect and reduced manufacturing cost. Background technique [0002] In medical and industrial applications, far-infrared detectors and cameras using wavelengths around 10,000 nm, which are often used, have low sensitivity. In addition, the transmittance of germanium used in these optical systems is lower than that of ordinary optical lenses. Therefore, the optical systems of these measuring instruments are required to minimize the number of optical components such as lenses that absorb, scatter, and reflect infrared rays from the subject, and efficiently transmit the infrared rays to detectors and cameras. [0003] Referring to the Chinese patent literature, the patent number is 201210506770.4, the following infrared camera lenses are proposed, which are suitable for infrare...

AI Technical Summary

Problems solved by technology

This infrared camera lens uses germanium as the lens material, which increases the production cost of the lens and increases the difficulty of making the lens.

In addition, internal focusing by moving lens L2 or lens L3 requires complex structural design, and the imaging quality is easily affected by the moving position of lens L2 or lens L3

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