Afocal Continuous Zoom System for Operating Microscope

Abstract

The invention discloses an afocal continuous zoom system, which is used in an operation microscope. The operation microscope includes a zoom cam, and the zoom cam has a first cam curve and a second cam curve. The configuration of the first to fourth lens groups, the first lens group is the front fixed group; the second lens group is the compensation group; the third lens group is the zoom group; the fourth lens group is the rear fixed group; the rotation of the zoom cam drives the first When the second lens group and the third lens group move along the optical axis at the same time, the focal length of the system changes linearly and continuously. The third lens group moves according to the law of the second cam curve, and the second lens group moves according to the law of the first cam curve. , the first cam curve is an exponential curve, and the second cam curve is a linear curve. In the continuous variable focal length system, the focal length value of the system changes linearly with a cam curve of the zoom cam, which provides a huge advantage for the engineering of the system.

Description

technical field [0001] The invention relates to a continuous zoom system, in particular to an afocal continuous zoom system of a high-resolution operating microscope. Background technique [0002] The object plane of the surgical microscope system is located on the focal plane of the large objective lens. After passing through the large objective lens, a parallel beam emerges. After passing through the zoom system, the output is still a parallel beam. The auxiliary lens group will converge the parallel beam to the eyepiece. On the object focal plane, the zoom and focus of the entire system is realized through the zoom of the afocal zoom group. The afocal zoom system is a key component of the optical system of the surgical microscope. It undertakes the continuous zoom function of the surgical microscope system, realizes the continuous change of the object plane range, and eliminates the doctor’s discomfort caused by the jump of the field of view. Achromatic technology enable...

AI Technical Summary

Problems solved by technology

[0004] The Chinese invention patent application with the application number 201310668054.0 discloses a microscope optical zoom system. The lens components that make up the system include a doublet lens, a single lens, and a triple single lens structure, and the structure and zoom are relatively complicated.

At the same time, the cam curve of its microscope optical zoom system is a linear, a U-shaped turning curve, and the system does not mention the change trend of the focal length value of the system during the lens movement change process

In the optical system of the surgical microscope, there are strict requirements on the volume of the continuous zoom imaging system, which needs to be miniaturized, and the existing optical zoom system cannot meet the requirements

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