Economic high-definition athermalization prime lens

Abstract

The present invention relates to the field of lens technology, in particular to an economical high-definition athermalized fixed-focus lens, which sequentially includes: a first lens, a second lens, a third lens and a fourth lens along the light incident direction, the first lens, the third lens The lens and the fourth lens are plastic aspheric lenses, and the second lens is a glass spherical lens; the focal length of the economical high-definition athermalized fixed-focus lens and the focal length of the third lens and the fourth lens satisfy the following relationship: 0.96<∣f3 / f∣<1.15; 1.31<∣f4 / f∣<1.73; the present invention uses a reasonable combination of glass and plastic lenses, which has good imaging quality and enables the infrared to reach megapixels without refocusing, even It can also achieve clear and bright monitoring images under low illumination at night. At the same time, it can be used in an environment of -30 to +80 degrees without running out of focus. It also has better signal-to-noise ratio, color saturation and lower production costs. features.

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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