Ultra-wide field optical system

Abstract

The invention discloses an ultra-wide field optical system. A first lens, a second lens, a third lens, a fourth lens, a fifth lens, an optical filter and a plate are arranged successively from the object side to the image surface; a diaphragm is arranged between the second lens and the third lens; the focus of the first lens is f1; the focus of the second lens is f2; the focus of the third lens is f3; the focus of the fourth lens is f4; and the focus of the fifth lens is f5, wherein 2<f1/f2<3, -2<f3/f4<-1, and -2<f4/f5<0. The ultra-wide field optical system can solve the problem about compression of field of view of an ultra-wide field lens, and can effectively reduce the height of a wide angle light on the main surface of the lens so as to reduce the whole length of the lens and reduce the construction tolerance sensitivity, and can enable the whole imaging surface of the lens to be uniform, to be high in luminance and to be large in aperture and can enable the stop number of the lens to achieve F2.0 so that the ultra-wide field imaging being greater than 220DEG can be realized.

Description

【Technical field】 [0001] The invention relates to an optical lens, in particular to an ultra-wide-angle optical system. 【Background technique】 [0002] In the existing monitoring lens, the field of view is generally less than 140°. In order to meet the all-round monitoring, the monitoring lens needs to be rotated accordingly, and the rotation range is relatively large, otherwise it is impossible to conduct a comprehensive real-time view of the scene in the larger field of view. monitor. Therefore, it is easy to produce dead angles, resulting in inadequate monitoring. [0003] The present invention just proposes based on the shortcoming that the above-mentioned prior art exists. 【Content of invention】 [0004] The present invention overcomes the deficiencies of the prior art, and provides an ultra-wide-angle, ultra-thin, small-volume, high-pixel optical lens suitable for small viewing distance, small space, ultra-wide-angle clear imaging, and can be used for vehicle-mount...

AI Technical Summary

Problems solved by technology

[0002] In the existing monitoring lens, its field of view is generally less than 140°. In order to meet the all-round monitoring, the monitoring lens needs to be rotated accordingly, and the rotation range is relatively large, otherwise it is impossible to conduct a comprehensive and real-time view of the scene in the larger field of view. monitor

Therefore, it is easy to produce dead angles, resulting in inadequate monitoring

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