Four-slider zoom compensation mechanism of zoom lens

Abstract

The invention discloses a four-slider zoom compensation mechanism of a zoom lens and relates to a zoom compensation mechanism, which belongs to the technical field of photoelectric instruments. The technical problem to be solved is to provide the four-slider zoom compensation mechanism of the zoom lens. The technical scheme is that the four-slider zoom compensation mechanism of the zoom lens comprises the following parts: a cover plate, a left adjusting nut, a left bearing retainer ring, a first steel ball, a first slider, a cam, a zoom carriage, a zoom guide shaft, a lens cone, a second steel ball, a second slider, a third slider, a compensation lens set, a compensation carriage, a zoom lens set, a fourth slider, a compensation guide shaft and the like. When the cam rotates, the zoom guide shaft performs curvilinear motion along a cam groove to drive the zoom lens set to move axially along the first slider and the second slider; meanwhile, the compensation guide shaft performs the curvilinear motion along the cam groove to drive the compensation lens set to move axially along the second slider and the forth slider, so that the focus distance regulation of a large-aperture zoom lens is realized, and regulation precision is high.

Description

technical field [0001] The invention belongs to the technical field of photoelectric instruments and relates to a four-slide-bar variable magnification compensation mechanism for a zoom lens. Background technique [0002] Most of the optoelectronic instruments used for observation, recording, tracking, and testing use optical zoom lenses, and the imaging quality of optical lenses with variable focal length is determined by its zoom compensation mechanism. [0003] The prior art closest to the present invention is the "three-bar variable power compensation mechanism for the zoom lens" developed by the Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences. Such as figure 1 , figure 2 , image 3 shown. Including the first slider left screw 1, screw 2, cover plate 3, left adjustment nut 4, left bearing stop ring 5, first steel ball 6, first slider 7, cam 8, zoom slider 9, zoom Guide shaft 10, first zoom linear bearing 11, first zoom bearing...

AI Technical Summary

Problems solved by technology

[0006] When the cam 8 rotates with the cam shaft system, the cam curve on the cam 8 drives the zoom lens group 22 and the compensation lens group 18 to move linearly along the first slide bar 7 and the anti-rotation slide bar 25 respectively, and the zoom lens group 22 and the compensation lens group The relative position of the lens group 18 is determined by the cam curve on the cam 8, and the mutual angular relationship is determined by the mutual position and deformation of the first sliding bar 7 and the anti-rotation sliding bar 25. This mutual angular relationship directly determines The imaging quality of zoom TV, the first slide bar 7 and anti-rotation slide bar 25 are fixed in the end hole of lens barrel 13, so the end of lens barrel 13 is installed the hole of first slide bar 7 and anti-rotation slide bar 25 The machining accuracy is very important. The machining position accuracy is limited by the processing machine tool, so that the mutual position accuracy of the first slide bar 7 and the anti-rotation slide bar 25 will not be too high. Slide bar 7 and anti-rotation slide bar 25 bear, and the second slide bar 17 only plays the effect of restricting rotation, does not bear weight, when variable power mirror group 22 and compensating mirror group 18 dimensions are bigger, weight is just heavier, like this by a single When the slider is supported, the deformation of the slider will be large. When the focal length of the zoom TV changes, the error of the relative change between the zoom lens group and the compensation lens group in the center of the movement will be large. In order to ensure that the image is clear when the zoom TV is zoomed, this In such a structure supported by a single rod, the weight of the zoom lens group and the compensation lens group cannot be too large, which limits the design of the optical structure, and cannot design a large-caliber zoom and compensation structure

Images