Patent ID: 7828924
Filing Date: 2010-11-09
Classification: H05K,Y10S,Y10T

Abstract:
1. A method of manufacturing a circuit board comprising: providing a prepreg sheet having a first surface and a second surface opposite to the first surface, the prepreg sheet having a thickness t placing a first film on the first surface of the prepreg sheet, the first film having a thickness t placing a second film on the second surface of the prepreg sheet, the second film having a thickness t forming a through-hole in the prepreg sheet, a first hole in the first film, and a second hole in the second film, the through-hole communicating with the first surface and the second surface of the prepreg sheet, the though-hole having a minimum diameter r filling the though-hole, the first hole, and the second hole with a conductive paste; peeling off the first film and the second film from the prepreg sheet such that the conductive paste protrudes from at least one of the first surface and the second surface of the prepreg sheet; after said peeling off the first film and the second film, forming a laminated body by placing a first metal foil on the first surface of the prepreg sheet; and curing the laminated body, wherein the through-hole, the first hole, and the second hole satisfy a relation: wherein the through-hole has a first opening in the first surface of the prepreg sheet and a second opening in the second surface of the prepreg sheet, and wherein the minimum diameter r