Optical passive semi-athermalization zoom optical system with large zoom ratio

Abstract

The invention, which belongs to the technical field of photoelectric imaging, particularly provides a large-zoom-ratio optical passive semi-athermalization zoom optical system which is sequentially provided with a front focusing group, a zooming group, a compensation group, a rear fixing group and an optical filter that are arranged from left to right along an optical axis. The left side of the front focusing group is an object plane, and the right side of the optical filter is an image plane. Continuous zooming and compensation are realized through front-back relative movement of the zoominggroup and the compensation group in an optical axis direction. The front focusing group can move left and right along the optical axis to realize a focusing function; and specifically, focusing is realized in a front group focusing mode, and the image surface temperature defocusing amount is compensated. The optical system has characteristics of long focal length, large zoom ratio, quite compact structure, excellent imaging and the like; the short focus of the zoom system is athermalized, so that problems that the traditional zoom system cannot realize consistent and clear imaging in the wholezoom process when the environment temperature changes, and frequent multiple-times focusing is needed are solved. The user operation and use are facilitated, the focusing amount is greatly reduced, and rapid focusing is facilitated.

Description

technical field [0001] The invention belongs to the technical field of photoelectric imaging, and relates to a compact, large zoom ratio, optical passive semi-athermal continuous zoom optical system. Background technique [0002] With the development of modern society and the advancement of science and technology, continuous zoom optical systems have been widely used in various aspects of life, such as security, monitoring, skynet, transportation, production safety, forest fire prevention and other fields. People's requirements and expectations for zoom lenses are getting higher and higher. Not only are they required to see far and clearly, but also the zoom system has functions and performances such as large zoom ratio, compact structure, small size, and easy use. [0003] The application of zoom lenses has been in use for decades, but the traditional zoom system with large zoom ratio and long focal length is bulky. More importantly, when the ambient temperature changes, th...

AI Technical Summary

Problems solved by technology

[0007] The present invention provides a large zoom ratio optical passive semi-athermal zoom optical system. In addition to the characteristics of long focal length, large zoom ratio, relatively compact structure, and excellent imaging, the short focus of the zoom system is athermalized. It overcomes the problem that the traditional zoom system cannot produce consistent and clear images during the whole process of zooming when the ambient temperature changes, and requires frequent and multiple focusing. It is not only convenient for users to operate and use, but also greatly reduces the amount of focusing, which is conducive to fast focusing

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