发明授权
US06977349B2 Method for manufacturing wiring circuit boards with bumps and method for forming bumps 失效
用于制造具有凸块的布线电路板的方法和用于形成凸块的方法

Method for manufacturing wiring circuit boards with bumps and method for forming bumps
摘要:
Wiring circuit boards with bumps can be manufactured such that stable bump connections are possible and plating pre-treatments or other difficult operations are rendered unnecessary. By utilizing a technique whereby a bump-formation etching mask 7 is formed on a bump-forming surface 3a of a metal foil 3 which has a thickness that is the sum of the thickness t1 of the wiring circuit 1 and the height t2 of the bumps 2 which are to be formed on the wiring circuit 1 (t1+t2), and then the bumps 2 are formed by half-etching the metal foil 3 to a depth corresponding to the desired bump height t2 from the bump-formation etching mask 7 side, wiring circuit boards with bumps can be manufactured such that stable bump connections are possible and plating pre-treatments or other complex processes are rendered unnecessary.
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