Patent ID: 6739039
Filing Date: 2004-05-25
Classification: G03F,H01L,H05K,Y10T

Abstract:
A manufacturing method of a printed circuit board using a dry film resist, comprising the steps of sequentially:laminating a dry film resist on a printed circuit board; exposing said dry film resist to UV radiation in the presence of a photo mask; annealing said dry film resist subsequent to said UV radiation curing step; and developing said dry film resist and removing unexposed areas of said resist, wherein said resist has a thickness defined by the relationship 5 &mgr;m&lE;t&lE;100 &mgr;m wherein â€œtâ€  represents the thickness of a resist layer between base and cover films of the dry film resist, provided that 20 &mgr;m&lE;t&lE;30 &mgr;m is excluded.