Patent ID: 6284308
Filing Date: 2001-09-04
Classification: H05K,Y10T

Abstract:
A manufacturing method of a printed circuit board having a blind hole comprising steps of:coating insulative thermosetting resin on a surface of a printed circuit board having a blind hole so as to form an insulative thermosetting resin layer on the printed circuit board and so as to fill up the blind hole with the insulative thermosetting resin in a normal atmospheric pressure;reducing pressure surrounding the printed circuit board coated with the thermosetting resin to a low pressure of 1.3 to 666 hPa;keeping the printed circuit board coated with the insulative thermosetting resin in the low pressure atmosphere of 1.3 to 666 hPa;increasing pressure surrounding the printed circuit board coated with thermosetting resin to the normal atmospheric pressure; andhardening the insulative thermosetting resin.