Economic high-definition athermalization prime lens

Abstract

The invention relates to the technical field of lenses, in particular to an economic high-definition athermalization prime lens. The economic high-definition athermalization prime lens sequentially comprises a first lens, a second lens, a third lens and a fourth lens along the incident direction of light, wherein the first lens, the third lens and the fourth lens are plastic aspherical lenses; the second lens is a glass spherical lens. The focal length of the whole lens of the economic high-definition athermalization prime lens and focal lengths of the third lens and the fourth lens meet the following relationship: an absolute valve of f3 / f is greater than 0.96 and smaller than 1.15, and an absolute valve of f4 / f is greater than 1.31 and smaller than 1.73. By reasonably using a glass and plastic lens combination, the economic high-definition athermalization prime lens disclosed by the invention has good imaging quality; megapixel can be reached by infrared rays on the premise of not refocusing; a clear and bright monitoring frame can be obtained even if at low illumination during night; meanwhile, the economic high-definition athermalization prime can avoid focus shift in an environment of 30 DEG C below zero and 80 DEG C and has the characteristics of better signal-to-noise ratio and color saturation as well as lower production cost.

Description

technical field [0001] The invention relates to the field of lens technology, in particular to an economical high-definition athermalized fixed-focus lens. Background technique [0002] Social stability is inseparable from a dedicated security monitoring system. Surveillance cameras with HD or full HD pixels are gradually occupying the market. HD camera chips have 1280*720 pixels, which is 720p, and full HD camera chips have 1920*1080 pixels, which is 1080p. [0003] The size of the chip is different, the mainstream size is 1 / 3 inch or 1 / 4 inch, the specification of the chip determines the design requirements of the lens, 1080p, 1 / 3 inch chip can achieve a relatively ideal image quality, but currently such The lens also has the problem of poor image quality, and the resolution of this type of lens needs to be improved. [0004] The method of improving the resolution can increase the number of lenses, or use fewer lenses to reduce the clear aperture, but this solution has th...

AI Technical Summary

Problems solved by technology

[0003] The size of the chip is different, the mainstream size is 1 / 3 inch or 1 / 4 inch, the specification of the chip determines the design requirements of the lens, 1080p, 1 / 3 inch chip can achieve a relatively ideal image quality, but currently such The lens also has the problem of poor image quality, and the resolution of this type of lens needs to be improved

[0004] The method of improving the resolution can increase the number of lenses, or use fewer lenses to reduce the clear aperture, and this solution has the problem of high production cost

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