Teleconverter for wide-angle high-magnification zoom lens

Abstract

The invention relates to a teleconverter for an wide-angle high-magnification zoom lens, wherein a front group A with a negative focal power and a rear group B with a positive focal power are sequentially arranged in the optical system of the teleconverter along the left-to-right incident direction of a light ray; the front lens group A is sequentially provided with a negative meniscus lens A-1 and a biconcave lens A-2, and the lens rear group B is a glued group formed by airtightly connecting a negative meniscus lens B-1 with a biconvex lens B-2; the mechanical structure of the teleconverter comprises a lens cone, a front group installation seat and a rear group installation seat are opened in the lens cone, the front lens group A is placed on the front group installation seat and tightly pressed by a front press ring, the rear lens group B is placed on the rear group installation seat and tightly pressed by a front press ring, and an AB space ring is arranged between the biconcave lens A-2 and the negative meniscus lens B-1. The teleconverter has the advantages of being high in zoom ratio, large in wide angle, high in adaptivity and the like, as well as is beneficial to expansion for the view field angle of the wide-angle zoom lens, and is good in imaging effect in the high-magnification zoom 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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