Optical fixed-focus lens

Abstract

The present invention relates to the lens display technology field, in particular to an optical fixed-focus lens used for realizing a large image surface and a large aperture of the optical fixed-focus lens. The optical fixed-focus lens comprises, orderly from an object side to an image side, a first lens group, a second lens group, a diaphragm and a third lens group, wherein the focal power of the first lens group is negative, the focal power of the second lens group is positive, the focal power of the third lens group is positive, and the diaphragm is located between the second lens group and the third lens group; the first lens group comprises a biconvex first lens of which the focal power is positive, a biconcave second lens of which the focal power is negative, a biconcave third lens of which the focal power is negative and a biconvex fourth lens of which the focal power is positive. Therefore, the high definition imaging demand can be realized, the image surface and the view field of the optical fixed-focus lens are expanded, and the resolution of the optical fixed-focus lens is improved.

Description

technical field [0001] The invention relates to the technical field of lens display, in particular to an optical fixed-focus lens. Background technique [0002] The development trend of intelligent transportation optical lens is high definition, large image area, low cost, large field of view, and large depth of field. With the continuous development of safe cities and road monitoring, electric police, speedometers and other intelligent transportation fields prefer 1 / 1", 4 / 3" and other large-size CCD / CMOS optical lenses to realize parking license plates for more than 3 lanes High-definition monitoring of the field of view such as traffic lights and traffic lights. At present, in the intelligent traffic security monitoring optical lens market, there are very few products that can simultaneously satisfy 4 / 3”-inch imaging and a field of view of about 60°, and the price is relatively expensive. [0003] In addition, the imaging pixel quality of intelligent traffic electronic p...

AI Technical Summary

Problems solved by technology

[0004] An embodiment of the present invention provides an optical fixed-focus lens to solve the problem that the optical fixed-focus lens in the prior art cannot meet the requirements of large image plane and large aperture.

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