Manufacture Of Pcb Board
Generation of PCB Board Photo Plots Data

The basis of PCB board generation is film negative. In the early stage of making film negative, technicians need to make film base, and then use the base to take photos or reprint. The film base should be as accurate as the PCB board requires. Technicians should also consider compensation to deviation made by manufacturing technique. The film base could be provided by customers or manufacturers, but the two of them should work and consult closely with each other so that the PCB board may not only satisfy users, but also adapts to production condition. If customers offer the film base, PCB board manufacturer should examine and approve it, and customers can evaluate and approve original film base or the first piece of PCB products Rigid flex PCB.

Making Methods of Film Base

There are several types of making methods of the film base. They are hand printing, picture pasting and CAD drawing. Along with the development of computer technology, PCB board CAD technology got a huge improvement. PCB board manufacturing technique also constantly advanced to multilayer, thin wire, small bore, and high density. The old film making technique was no longer enough to satisfy design need of PCB board. Thus photo plots technology appeared. Using photo plotter may directly send PCB graphic data designed by CAD to computer system of photo plotter, and control photo plotter direct drawing on the film base through lights. Then it gets the film negative after developing and photographic fixing. PCB board film negatives made by photo plot technology are fast, accurate, and high-quality, which shorten the PCB board production phase. Laser plotter is able to finish jobs took a long time by many people in a very short time. Besides, the thin wire and high density film negative made by laser plotter are much better than those made by hand. According to different structure, laser plotter could be divided into surface plate, internal drum and external drum laser plotter. It adapts to Gerber-RS274 standard data format, which is also the standard data format of PCB design and manufacture industry. Gerber format's name quoted from the pioneer of photo plotter design and manufacture - US Gerber Company. The production of photo plotter is to transform design data from CAD soft to photo plot data. After CAM's modification and edition Rigid flex, it finishes photo plot pretreatment (including makeup and mirror image), which makes the data reaching requirements of PCB board manufacturing technique. Then technicians send the finished data into photo plotter. Raster of photo plotter will transform those data into raster data, which will be sent to laser plotter by high power fast compressing retrieving algorithm. The whole process is finished.

Photo Plot Data Format

Photo plot data format was developed based on the data format Gerber of vector quantity photo plotter, extended the data of vector quantity photo plotter, held HPGL, AutoCAD DXF, TIFF these specialized and universal data format. Some CAD and CAM developers also extended the Gerber data.

www.wonderfulpcb.com specializes in manufacturing and selling high-precision, high-density double-sided PCBs and multilayer PCBs. Our company provide flexible PCB board samples and mass production, rapid delivery and services to customers worldwide.

This article is come from:http://www.ronpcb.com
Related Links