Infrared confocal optical system

Abstract

The invention provides an infrared confocal optical system. The infrared confocal optical system comprises a first lens set, a diaphragm and a second lens set. The first lens set comprises a first lens having negative power and a second lens having positive power. The second lens set comprises a third lens having positive power, a fourth lens having positive power, a fifth lens having negative power and a sixth lens having positive power. The diaphragm is located between the second lens and the third lens. According to the infrared confocal optical system, through composition of the two lens sets and the diaphragm, on the premise that a larger lens size, more lenses and a more complicated structure are not needed and therefore cost is controlled, the infrared confocal optical system has the advantages of having a wide angle, a high periphery brightness ratio, a large relative aperture, high definition and the like; the infrared confocal optical system further has the advantage that infrared rays are confocal.

Description

technical field [0001] The invention relates to an imaging optical system, in particular to an infrared confocal optical system. Background technique [0002] At present, the large-field-of-view wide-angle lenses used in security, vehicle, and video conferencing generally have the problems of wide-angle, high peripheral light ratio, large relative aperture, high definition, and infrared confocal. [0003] Wide-angle is a lens technical specification that meets the needs of security, vehicle, and video conferencing. However, as the field of view of the lens increases, the peripheral light ratio will decrease, and there will be darker defects around the screen. [0004] The large relative aperture is a requirement for the lens to meet the needs of security, vehicle, and video conferencing; the large relative aperture can improve the illumination of the image plane. However, similar lenses on the market, as the relative aperture increases, the image quality deteriorates, whic...

AI Technical Summary

Problems solved by technology

[0007] The lenses currently on the market cannot meet the needs of security, vehicle, and video conferencing for a lens that has wide-angle, high peripheral light ratio, large relative aperture, high-definition, and infrared confocal at the same time, unless a larger lens size, More lenses and more complex structure, resulting in high cost

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