前言印制板照相底版质量的优劣,直接影响印制电路板制作过程的每个环节。如底片黑白度差,将影响贴膜工序的曝光与显影,给电镀工序、蚀刻工序造成难以挽回的损失;底版尺寸误差,将影响对孔精度,甚至因插头偏差,孔化点偏离,导纱相连而短路,促使加工后的印制板报废。目前,尽管国内外有些厂家采用CAD(计算机辅助设计)方法,从逻辑图到底皈的制作过程全部采用全自动方式,可能 Preface PCB quality advantages and disadvantages of phototypesetting, a direct impact on the printed circuit board making every aspect of the process. Such as negative black and white film, the film will affect the process of exposure and development, to the plating process, the etching process caused irreparable damage; floor size error, will affect the accuracy of the hole, and even plug deviation, drift point, yarn guide connected The short circuit, prompting the processing of printed circuit board scrapped. At present, although some domestic and foreign manufacturers use CAD (Computer Aided Design) method, all the production process from the logic diagram conversion to fully automatic method may