Structural realization of small zoom camera

The main technical parameters and the zoom method for the camera with small size and large zoom ratio are introduced. Each structural part of the camera is described in detail. The zoom and compensating lens group slide in the main body through the slide frame,whose movements are assured by the movement of the guide pin in the cam curve groove. The measures to ensure the quality and the precision taken in the process and assembling of the camera are expatiated. The clearance between cam curve groove and roller is controlled about 6 ~ 9 μm,and the stiffness and column of the main body are insured. The return errors are less than 2″ when the zoom and compensation slide frame slide in the main body. The ratio between diameter and length of the slide frame should be no less than 1. The results show that optical transfer function of the camera is more than 0. 2 in the space frequency of 50 lp / mm after high-and-low temperature vibration tests, and the location images of camera are clear.