Patent ID: 6294743
Filing Date: 2001-09-25
Classification: H05K,Y10S

Abstract:
A multilayer print circuit board comprising:a substrate being electrically insulative;a first circuit pattern provided on at least one surface of the substrate;an insulation layer having an inner insulation layer and an outer insulation layer laminated thereon, said insulation layer being provided on the substrate to overlay the first circuit pattern, wherein the outer insulation layer comprises a resin, calcium carbonate powder and polybutadien as a shock resistant agent, wherein said calcium carbonate powder has an average particle size of 2 to 4 .mu.m being dispersed in the resin, a weight ratio of 15 to 35 weight parts of calcium carbonate powder to 100 weight parts of resin and wherein said polybutadien has a weight ratio of 10 to 20 weight parts of polybutadien to 100 weight parts of resin, and wherein the inner insulation layer comprises a resin;a blind hole provided in the insulation layer so as to reach the first circuit pattern for exposing a surface of the first circuit pattern;a second circuit pattern provided on the insulation layer or on the insulation layer and an inner wall of the blind hole so as to electrically connect the first circuit pattern to the second circuit pattern through the blind hole.