Wide-field-of-view low-cost high definition athermalization prime lens

Abstract

The invention belongs to the technical field of optical devices, and particularly relates to a wide-field-of-view low-cost high definition athermalization prime lens. The wide-field-of-view low-cost high definition athermalization prime lens comprises a first lens, a second lens, a third lens and a third lens, which are successively arranged from an object space to an image space, the first lens is a biconcave negative power plastic aspherical lens, the second lens is a biconvex positive power glass spherical lens, the third lens is a biconvex positive power plastic aspherical lens, and the fourth lens is a biconcave negative power plastic aspherical lens. Compared with the prior art, when the wide-field-of-view low-cost high definition athermalization prime lens is combined with a chip of 1080p and 1/4 inch, a resolution ratio of 1080p can be achieved under the visible light and infrared rays, the cost is reduced, and the performance is also ensured. Meanwhile, the field of view is wide.

Description

technical field [0001] The invention belongs to the technical field of optical devices, in particular to a low-cost high-definition athermalized fixed-focus lens with a large field of view. 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; At the same time, the size of the chip varies, and the mainstream size is 1 / 3 inch or 1 / 4 inch. The specifications of the chip determine the design requirements of the lens. A 1080p, 1 / 3-inch chip is sufficient to achieve an ideal image quality, but at present, this type of lens still has the problem of poor image quality, and the resolution needs to be improved. The method to improve the resolution Including increasing the number of lenses, or using fewer lenses to reduce the light ape...

AI Technical Summary

Problems solved by technology

The specifications of the chip determine the design requirements of the lens. A 1080p, 1 / 3-inch chip is sufficient to achieve an ideal image quality, but at present, this type of lens still has the problem of poor image quality, and the resolution needs to be improved. The method to improve the resolution Including increasing the number of lenses, or using fewer lenses to reduce the light aperture, but it will cause an increase in cost or insufficient light transmission, so there is a problem that performance and cost are difficult to balance, and the field of view of the fixed-focus lens in the prior art angle not big enough

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