Mechanical zoom lens device

Abstract

The invention relates to a mechanical zoom lens device which comprises a first cylinder (103) provided with a zoom curve groove (117) and a compensating curve groove (116), a second cylinder (104) provided with a straight line groove (115), a first circular ring (105) provided with a first keyhole (111) and a second circular ring (106) provided with a second keyhole (112), a zoon lens (107), and compensating lens systems (108, 110), wherein the first circular ring and the second circular ring are clamped within the zoom curve groove, the compensating curve groove and the straight line groove so as to limit the axial movement of the zoom lens and the compensating lens systems fixed in the circular rings for keeping a position of an image plane unchangeable. The invention has the advantages of simple mechanical structure, less parts, easy assembly in production, low production cost, small volume of products, light weight, no easy damage when the products are transported and used, and easy maintenance. 本发明涉及一种机械式变焦镜头装置，包括设有变焦曲线线槽(117)、补偿曲线线槽(116)的第一圆筒(103)、设有直线线槽(115)的第二圆筒 (104)、设有第一栓孔(111)的第一圆环(105)和设有第二栓孔(112)的第二圆环(106)、变焦透镜(107)、补偿透镜组(108、110)，通过栓子将第一圆环和第二圆环卡在变焦曲线线槽、补偿曲线线槽、直线线槽内以限制固定在圆环内的变焦透镜、补偿透镜组的轴向运动进而保持像平面的位置不变。本发明具有以下有益效果：机械结构简单，部件少，生产时装配容易，生产成本低；产品的体积小，重量轻，产品运输、使用时不易损坏，维修容易。