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目前缩放图纸有方格网法、悬臂式缩放仪法、幻灯机法、复照仪法。前两种工效低,方法落后,成图精度低;后两种需要复照底片,工序繁杂,复照仪价格昂贵,还需要一套制版设备,一般不便购置,我队试制成功的光学放图仪结构简单,操作方便,成图快捷,精度亦较高。自一九七○年投入生产使用后,经过改进,效果良好。一、原理如果用U表示发光点到透镜间的距离,V表示象到透镜间的距离,F表示透镜的焦点,透镜的共轭公式为:
At present, there are scales grid drawings grid method, cantilever zoom method, slide machine method, complex camera method. The first two kinds of work efficiency is low, the method is backward, the accuracy of the drawing is low; the latter two need complex photographic film, complicated procedures, complex photometric instrument is expensive, but also need a plate making equipment, generally inconvenient purchase, our team trial successful optical mapping Instrument structure is simple, easy to operate, map fast, high precision. Since its introduction into production in 1970, it has been improved and worked well. First, the principle If the luminous point with U that the distance between the lens, V represents the distance between the lens to the lens, F said the focus of the lens, the lens conjugate formula is: