Wide-angle high-magnification zoom lens multiplier

Abstract

The invention relates to a wide-angle high-magnification zoom lens multiplier, the optical system of which is sequentially provided with a front lens group A with negative refractive power and a rear lens group B with positive refractive power along the incident direction of light from left to right. The front lens group A is sequentially provided with a negative crescent lens A-1 and a biconcave lens A-2, and the rear lens group B is a cemented group composed of a negative crescent lens B-1 and a biconvex lens B-2. ; Its mechanical structure includes a lens barrel, which is provided with a front group mounting seat and a rear group mounting seat in the lens barrel, and the front lens group A is placed on the front group mounting seat and pressed by the front pressure ring, and the rear group is installed The rear lens group B is placed on the seat and pressed by the rear pressure ring, and an AB spacer is arranged between the biconcave lens A-2 and the negative crescent lens B-1. The extender has the characteristics of large zoom ratio, large wide-angle, and strong adaptability. It not only helps to expand the field of view of the wide-angle high-magnification zoom lens, but also has good imaging effects during the high-magnification zooming process of the zoom lens.

Description

technical field [0001] The invention relates to a video camera lens device, in particular to a wide-angle high-magnification zoom lens multiplier, which belongs to the field of photoelectric technology. Background technique [0002] The rapid development of science and technology and the gradual improvement of people's safety awareness have promoted the continuous progress of the security market. Nowadays, with the continuous maturity of advanced video compression coding technology, the rapid development of IP-based network transmission and the application of digital zoom technology, a series of high-definition cameras with 3 million and 5 million pixels have been launched on the market. However, in the process of network transmission and digital zooming, the clarity (that is, resolution) of the video will decrease to a certain extent, but at the same time, people's requirements for image resolution are getting higher and higher. The requirements for the field of view are g...

AI Technical Summary

Problems solved by technology

The existing structural type of multiplier can only be used with a fixed focal length lens or a low-magnification zoom lens, and the field of view of the lens that can be adapted is relatively small. After it is expanded, the field of view of the imaging system It can't reach the level of wide angle

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