An ultra-wide working distance, reverse scanning, long focal length, continuous zoom visible light optical system

By designing an ultra-wide working distance band-scanning long focal length continuous zoom visible light optical system, the problem of unclear imaging at close range of long focal length optical systems has been solved, stable imaging in high and low temperature environments has been achieved, the servo control precision requirements have been reduced, and the system performance and economy have been improved.

CN121578488BActive Publication Date: 2026-07-17HUBEI JIUZHIYANG INFRARED SYST CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUBEI JIUZHIYANG INFRARED SYST CO LTD
Filing Date
2025-12-31
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing long-focal-length optical systems struggle to produce clear images of close-range targets, especially in high and low temperature environments where the imaging effect is poor.

Method used

Design an ultra-wide working distance long focal length continuous zoom visible light optical system with reverse scanning. It consists of a front fixed lens group, a zoom lens group, a compensation lens group, a reverse scanning lens group, and a folding mirror. Through the cooperation of the focusing assembly and the reverse scanning lens group, it can achieve clear imaging from close to long distance and stabilize the image plane in high and low temperature environments.

Benefits of technology

It achieves clear imaging from close range to long range, reduces the precision requirements of servo control, and improves system performance and economy.

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Abstract

This invention discloses an ultra-wide working distance, long focal length, continuous zoom visible light optical system with reverse scanning, comprising a front fixed lens group, a zoom lens group, a compensation lens group, a first rear fixed lens group, a reverse scanning lens group, a second rear fixed lens group, a folding mirror, and a filter lens group, arranged sequentially along the optical axis from the object side to the image side. The first rear fixed lens group includes a first rear lens group, a second rear lens group, and a focusing assembly composed of two cemented negative lenses. By adding a focusing assembly composed of cemented negative lenses to the rear fixed lens group, this invention compensates for image plane drift at extremely close working distances and under high and low temperature operating conditions when the optical system is at a long focal length. This allows the working distance for clear imaging of the long focal length optical system to extend from 50m to infinity, achieving clear imaging from near to far targets.
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