Zoom structure with spiral and cam combined

Abstract

The invention provides the spiral and cam combined zoom structure, the guide pin is arranged on the outer circle of the cam, so that the zoom curve groove can not penetrate through the cam, the rigidity of the cam is ensured, relatively large deformation is avoided in the machining process, the shape precision of the cam zoom curve groove and precise zoom of a lens are ensured, and the machining precision is improved. Meanwhile, adjustment in the whole lens assembling process is facilitated; according to the design, the rigidity of the cam is ensured, and the number of zoom curves can be increased; due to the fact that the spiral mechanism achieves linear motion, the cam mechanism achieves non-linear motion, non-linear continuous zooming is achieved through combined motion of the spiral mechanism and the cam mechanism, and finally clear imaging at each position in the zooming process is achieved. The zoom lens is simple in structure, simple in processing and assembling process, reliable in working performance, low in cost, compact in structure, high in impact resistance and vibration resistance, high in transmission precision, sensitive in zoom reaction and high in imaging quality, and the performance of the zoom lens is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of optical-mechanical structures, and in particular relates to a zoom structure combined with a spiral and a cam. Background technique [0002] The appearance of the zoom lens satisfies people's need to control the size of the image at will. With the development, the zoom lens is continuously applied in various fields. [0003] The zoom lens is a camera lens that can change the focal length within a certain range, so as to obtain different wide and narrow field of view angles, different size images and different scene ranges. The zoom lens can be changed by changing the focal length without changing the shooting distance. Shooting range, so it is very conducive to the composition of the picture. [0004] Common zoom lenses have three zoom forms: screw mechanism, ball screw and cam mechanism. However, the zoom form of the screw mechanism has the fatal disadvantage of being unable to realize the nonlinear li...

AI Technical Summary

Problems solved by technology

However, the zoom form of the screw mechanism has the fatal disadvantage of being unable to realize the nonlinear linear motion of the lens; the assembly process of the zoom form of the ball screw is complicated, the assembly precision is high, the volume is large, and the ability to resist shock and vibration is poor; the zoom form of the cam mechanism is in the zoom curve. When it is small, the force on the lens group is not uniform during the movement, and it is prone to motion hysteresis or jamming, and cannot zoom normally.

When the zoom curve increases, the cam stiffness cannot be guaranteed

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