江西遂川亚恒电路有限公司JIANGXI SUICHUAN YAHENG CIRCUITS CO.,LTD. 深圳市亚恒电路有限公司SHENZHEN YAHENG CIRCUITS CO.,LTD

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PCB抄板技术的具体步骤介绍

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Update time : 2018-12-24 13:13:00

首先,拿到一块PCB,首先在纸上记录好所有元气件的型号,参数,以及位置,尤其是二极管,三级管的方向,IC缺口的方向。可以用数码相机拍两张元气件位置的照片。很多的pcb电路板越做越高级上面的二极管三极管有些不注意根本看不到。

第二步,拆掉所有器件,并且将PAD孔里的锡去掉。用酒精将PCB清洗干净,然后放入扫描仪内,扫描仪扫描的时候需要稍调高一些扫描的像素,以便得到较清晰的图像。再用水纱纸将顶层和底层轻微打磨,打磨到铜膜发亮,放入扫描仪,启动PHOTOSHOP,用彩色方式将两层分别扫入。注意,PCB在扫描仪内摆放一定要横平竖直,否则扫描的图象就无法使用。

第三步,调整画布的对比度,明暗度,使有铜膜的部分和没有铜膜的部分对比强烈,然后将次图转为黑白色,检查线条是否清晰,如果不清晰,则重复本步骤。如果清晰,将图存为黑白BMP格式文件TOP BMP和BOT BMP,如果发现图形有问题还可以用PHOTOSHOP进行修补和修正。


第四步,将两个BMP格式的文件分别转为PROTEL格式文件,在PROTEL中调入两层,如过两层的PAD和VIA的位置基本重合,表明前几个步骤做的很好,如果有偏差,则重复第三步。所以说pcb抄板是一项极需要耐心的工作,因为一点小问题都会影响到质量和抄板后的匹配程度。

第五步,将TOP层的BMP转化为TOP PCB,注意要转化到SILK层,就是黄色的那层,然后你在TOP层描线就是了,并且根据第二步的图纸放置器件。画完后将SILK层删掉。不断重复直到绘制好所有的层。

第六步,在PROTEL中将TOP PCB和BOT PCB调入,合为一个图就OK了。

第七步,用激光打印机将TOP LAYER,BOTTOM LAYER分别打印到透明胶片上(1:1的比例),把胶片放到那块PCB上,比较一下是否有误,如果没错,你就大功告成了。


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