Zoom lens zooming cam optimization method

Abstract

The present invention belongs the field of photoelectronic imaging devices, and especially relates to a zoom lens zooming cam optimization method. The problems are solved that a zoom lens zooming camis not smooth, low in zooming precision, low in speed and prone to get stuck. The method concretely comprises the steps of: 1, optical system design; 2, analysis of a cam pressure angle; 3, construction of a piecewise function for the whole cam according to a trend displayed by the cam pressure angle; and 4, analysis of focal length output precision.

Description

technical field [0001] The invention belongs to the field of photoelectric imaging equipment, and in particular relates to a zoom lens zoom cam optimization method. Background technique [0002] Optoelectronic equipment is mainly composed of optical lenses, detectors, peripheral circuits and equipment, of which the lens is an important part of its composition. In order to improve the application range of equipment, more and more zoom lenses are used. In the design of the zoom lens, the cam is still a commonly used mechanism for zooming and focusing, so the design of this mechanism is particularly important. [0003] It is clearly pointed out in the relevant research theories of zoom lenses that various structural forms of zoom lenses have a certain range of focal length. can not achieve. The existing lens design uses multiple groups (three groups, four groups) to cooperate with the appropriate root change point to solve the contradiction between miniaturization and large z...

AI Technical Summary

Problems solved by technology

[0003] It is clearly pointed out in the relevant research theories of zoom lenses that various structural forms of zoom lenses have a certain range of focal length. can not achieve

The existing lens design uses multiple groups (three groups, four groups) to cooperate with the appropriate root change point to solve the contradiction between miniaturization and large zoom ratio, but the zoom group or compensation group spacing at the root change point The cam curve of the cam often turns rapidly, resulting in too large pressure angle, and even the distance corresponding to the zoom group and compensation group will change in waves, which eventually makes the design impossible to realize in the structure.

In addition, the focal length change rate will change greatly at the root change point. This change and the unsmoothness of the cam will lead to the instability of the motor driving force and will also lead to a decrease in the focal length output accuracy of the optical system.

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