Teleconverter provided with flange wide-angle high-power lens

Abstract

The invention relates to a teleconverter provided with a flange wide-angle high-power lens. A front lens group A and a back lens group B are arranged in sequence in an optical system along a light ray incidence direction from left to right, the front lens group A is provided with a negative crescent lens A-1 and a biconcave lens A-2 in sequence, and the back lens group B is a glued group formed by hermetically connecting a negative crescent lens B-1 and a biconvex lens B-2. A mechanical structure comprises a lens barrel, a front group mounting seat and a back group mounting seat are arranged in the lens barrel, a flange extends out of the lens barrel at a transition position between the front group mounting seat and the back group mounting seat, the front lens group A is placed on the front group mounting seat and is compressed by using a front pressure ring, the back lens group A is placed on the back group mounting seat and is compressed by using a back pressure ring, and an AB isolating ring is arranged between the biconcave lens A-2 and the negative crescent lens B-1. By adopting the teleconverter, the field angle of a zoom lens is enlarged, and a good imaging effect is achieved in the high-power 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 lens multiplier with a flange, and 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 vie...

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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