Low principal ray incident angle super wide angle optical system and working method thereof

Abstract

The present invention provides a low principal ray incident angle super wide angle optical system and a working method thereof. The system comprises a lens tube and the optical system arranged in thelens tube. The optical system comprises a crescent negative lens L1, a crescent negative lens L2, a biconvex positive lens L3, an aperture light diaphragm S1, a crescent positive lens L4, a bonded lens consisting of a biconvex positive lens L5 and a crescent negative lens L6 and a biconvex positive lens L7 successively arranged along the direction from the position of light incident to an imagingplane. A parallel flat plate P1 is arranged between the imaging plane and the biconvex positive lens L7. The optical lens system has a very large view field angle and is capable of shooting a wide range of scenery, the relative illumination is relatively high, and especially, the incident angle of a principal ray is low under the condition of the large view field angle, so that the system can be well adapted to the current video surveillance imaging chip, and the lens can be used with a 5 million pixel CCD or a CMOS chip.

Description

technical field [0001] The invention relates to an ultra-wide-angle optical system with a low chief ray incident angle and a working method thereof. Background technique [0002] The lens is the indispensable "eye" of the video surveillance system. With the development of imaging chip technology, the requirements for the resolution of the lens are getting higher and higher, and the matching degree between the lens and the imaging chip is also getting higher and higher. At present, the wide-angle surveillance lenses on the market still have relatively low relative illuminance, and the incident angle of the chief ray is too large to match the imaging chip well, so that when the surveillance lens is used with a surveillance camera, the effect of the peripheral field of view is quite different from that of the central field of view, especially in It is more obvious when the resolution of the imaging chip is high. When this type of lens is used with a camera, it is difficult to ...

AI Technical Summary

Problems solved by technology

[0003] The present invention improves the above-mentioned problems, that is, the technical problems to be solved by the present invention are the problems of low relative illuminance and large chief ray incident angle of the existing video surveillance wide-angle lens. CRA video surveillance lens with high rate and good match with imaging chip

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