The law that add a layer (Build Up Process) says to fold a law again, it is one kind is used make way of high density, alveolus printed circuit board (a of PCB) special technology. The tradition is made multilayer the means of PCB is inside and outside each had been made respectively, close to press and be become next multilayer board. The law that add a layer differs greatly, in order to make eightfold board for exemple, it is normally after finishing 4 layer board, going up again, below two enclothe two each and become eightfold board. Multilayer PCB is interlinked to allow the line between layer and layer, must bore. The simplest way is via, be in multilayer board pressure after closing, bore of direct and perforative whole bat. But if be in,hold the post of the two bore between the layer, need blind opening (mouth at some surface, stop at lining) and bury aperture (bury completely between lining) technology. This basically applies in the electronic product with light, thin, small, short volume, wait like the mobile phone. Because blind buries Kong Bi to need,in each lining board makes a process in at the same time bore, technological process is long, proportion of semi-manufactured goods loss is higher. Use the legal system that add a layer to make PCB, in add a layer while, finish via at the same time with the special kind such as sensitive, laser, the blind, pull current Cheng that buries aperture shortens greatly, reduced cost. Additional, the law that add a layer can produce a more careful PCB. Use traditional method, the line of PCB is broad / the limit that the line is apart from can accomplish 4/4mi1(only one thousandth inches of) , and the law that add a layer can come subtly the line is broad / the line is apart from for 2/2mi1, can reduce bore diameter considerably at the same time. Current, high density spends join board (HDIboard, show the line is broad / the line is apart from be less than 4/4mi1) , small orifice plate (Micro-Vi A Board) , bore diameter 5 ～ 6mi1 is the following, must use the legal system that add a layer to make. Sort of the law that add a layer is various, japan is the whole world develops the nation with the earliest technology of the law that add a layer, at first becomes Kongfa to give priority to with optics, nearly one, use laser bore method 2 years. Optics becomes aperture law cost inferior, taller to having dirt environment to ask, the risk is bigger. Laser bore law, cost is high, reliability is higher, bore diameter is smaller, outside dividing Japan, taiwan province recommends the way that add a layer actively this year, prepare to develop competition with Japan on the price. The big plant such as Korea SamSung, LG also expresses to want to label the law that add a layer the stress that develops this year in succession. According to BPA estimation, 98 years the whole world increases layer board production value for 8. 800 million dollar, was 2000 15.
700 million dollar, can amount to 5.8 billion dollar 2007. CNC Milling
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