A high and low temperature confocal, no stray light optical system

Abstract

The invention discloses a high-low temperature confocal and stray-light-free optical system. A first lens (1), a second lens (2), a third lens (3), a diaphragm (100), a fourth lens (4), a fifth lens (5), a sixth lens (6) and a light-sensitive chip (200) are sequentially arranged from the object side to the image side. The first lens (1) is a glass spherical lens with a negative focal length. The second lens (2) is a plastic aspherical lens with a negative focal length. The third lens (3) is a plastic aspherical lens with a positive focal length. The fourth lens (4) is a glass spherical lens with a positive focal length. The fifth lens (5) is a plastic aspherical lens with a negative focal length. The sixth lens (6) is a plastic aspherical lens with a positive focal length. The high-low temperature confocal and stray-light-free optical system is simple in structure, confocal at high temperature and low temperature, high in pixel, small in distortion, high in transmittance, resistant to grinding and free of stray light.

Description

【Technical field】 [0001] The invention relates to an optical system, more specifically a high-low temperature confocal and stray-free optical system. 【Background technique】 [0002] At present, the lenses used in monitoring and vehicle lenses generally have such shortcomings: the high and low temperature of the lens is not confocal; the distortion of the ultra-wide-angle lens is large; the transmittance of the image plane is not enough, there is color cast; The lens improves certain aspects at the expense of other aspects. For example, in order to achieve high and low temperature confocal and high pixels, more lenses are used, and even lanthanum series glass is used to make the image surface have color cast, stray light and ghosting. In some cases, it cannot meet consumers' requirements for bright and refreshing image quality, or the distortion of the ultra-wide-angle lens has not been corrected at all, and there is a defect of large distortion. [0003] Therefore, the pres...

AI Technical Summary

Problems solved by technology

[0002] At present, the lenses used in monitoring and vehicle lenses generally have such shortcomings: the high and low temperature of the lens is not confocal; the distortion of the ultra-wide-angle lens is large; the transmittance of the image plane is not enough, there is color cast; The lens improves certain aspects at the expense of other aspects. For example, in order to achieve high and low temperature confocal and high pixels, more lenses are used, and even lanthanum series glass is used to make the image surface have color cast, stray light and ghosting. In some cases, it cannot meet consumers' requirements for bright and refreshing image quality, or the distortion of the ultra-wide-angle lens has not been corrected at all, and there is a defect of large distortion.

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