目前,国内对于精缩照相机的制版精度指标尚无统一规定和确切的定义。国外的同类机器均仅给出了任意一头拍照时的各项精度指标。然而对制版来说,单有这种指标是不够的,更重要的是一套掩膜版的套合精度,也就是常说的异头,不同车、不对号、补版的精度。本文力图以我所最近研制的JS—3型光栅定位四头精缩照相机为例,对一套掩膜版的套合精度作出定量分析。 At present, there is no uniform regulation and exact definition of the accuracy of plate making in China. Similar foreign machines are given only when any one of the camera when the precision indicators. However, the plate, the only such indicators is not enough, more importantly, a set of mask version of the set accuracy, which is often said that different, different car, wrong, complement the accuracy. In this paper, I recently developed JS-3-type grating positioning four precision camera, for example, a set of mask plate set to make a quantitative analysis of accuracy.