电视摄像机变焦距镜头的计算机辅助设计

Computer Aided Engineering Used for TV Camera Zoom Lens

本文详细论述了用CAD技术完成电视摄像机变焦距镜头辅跏设计的技术途径和具体过程。设计中用CAD的概念设计技术生成了全部零件的实体模型、生成了带有零件体积,密度、重量、重心、惯性矩、惯性积等属性的文件。用FORTRAN语言和AI(Application Interface)编写了计算整个系统质心及在变焦距时,质心偏摆的计算程序,计算了质心偏摆曲线,找出了应有的平衡位置。对设计所提出的各种材料的设计方案进行了重心计算、并提供了可靠的修改依据。最后用计算机和绘图仪绘制了全部(光学件、机械件、总装图)图纸。由于采用了CAD技术,对设计的零件均可多次优化确保设计一次成功。可消除由于难以算准质心及偏摆大小而导致的设计——加工——修改——再设计——再加工的反复,是我所CAD技术第一次成功地用于工程辅助设计的很好实例。

In this paper the approach and the procedure to complete the TV camera zoom lens design by means of CAE technique have been stated. The solid modeling for all parts has been created in terms of the concept design of CAE. The files which give the attributes such as volume weight, center of gravity moment of inertia, product of inertia for every part are generated. Based on the weight and center of gravity gained from each part the program is compiled with FOTRAN and AI for calculating the center of gravity and the center of gravity shift. The center of gravity shift curve is showed. The proper balance position is indicated. The system center of gravity is computed with different materials (aluminium, invar). The computation offers a reliable standard for modification. Finally all drawings for optical and mechanical parts and assemblies are drafted with computer and plotter. It is due to using the CAE technique the optimization in every designing step can be carried out for many times. By this way the design can be successfully finished within one period. This is a fine example in which the CAE technique has been perfectly used in our institute.