High-pixel ultrashort starlight lens

Abstract

The invention belongs to the technical field of optical devices and particularly relates to a high-pixel ultrashort starlightlens. The high-pixel ultrashort starlight lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens sequentially from object space to image space, wherein the first lens, the third lens and the fourth lens are glass spherical lenses; the second lens, the fifth lens and the sixth lens are plastic aspherical lenses; the first lens is a plano-concave lens with negative focal power; the second lens is a concave-convex lens with negative focal power; the third lens is a biconvex lens with positive focal power; the fourth lens is a biconvex lens with positive focal power; the fifth lens is a biconcave lens with negative focal power; the sixth lens is a biconvex lens with positive focal power. In conclusion, the advantages of easy processing of the glass spherical lenses and high performance and low cost of the plastic aspherical lenses are exerted sufficiently, so that the visible light resolution of the lens can reach 5-mega pixels, the infrared resolution can reach 5-mega pixels, F-number of the lens reaches 1.2, the lens has sufficient light flux, and pictures are clear and bright. Meanwhile, the total length of the lens is smaller than 22 mm, and the lens is compact in size.

Description

technical field [0001] The invention belongs to the technical field of optical devices, in particular to a high-pixel ultra-short star-level lens. Background technique [0002] With the improvement of the whole society's security awareness and the improvement of social science and technology, high-quality security monitoring systems quickly occupy the market. As one of the core components of the security system, the monitoring lens plays an extremely important role in the monitoring work. , so there is fierce competition in the market. Lens performance includes various parameters such as pixels, F-number, and total length. [0003] The traditional 4mm fixed focus lens has the following disadvantages: [0004] First, in order to increase the pixel size, more lenses are used. For example, the lens disclosed in patent CN203311082U uses a structure of 7 lenses, but the cost of this structure will inevitably be high; [0005] Secondly, the F number is relatively large, and the...

AI Technical Summary

Problems solved by technology

[0004] First, in order to increase the pixel size, more lenses are used. For example, the lens disclosed in patent CN203311082U uses a structure of 7 lenses, but the cost of this structure will inevitably be high;

[0005] Secondly, the F number is relatively large, and the amount of light passing through is insufficient. For example, the F number of the lens disclosed in the patent application CN105259637A is 2.2, and the F number of the lens disclosed in the patent application CN105301739A is 2.0;

[0006] Again, the total length of the lens in the prior art is about 30mm, and the volume is relatively large

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