Patent ID: 7155820

Claim:
A method of manufacturing a printed circuit board, comprising: preparing a dielectric substrate of a pre-preg formed by impregnating a glass cloth or a glass nonwoven fabric with a thermosetting epoxy resin mixed with fine particles, coating both surfaces of the dielectric substrate with mold-releasing films and subsequently forming a via hole, filling in the via hole with a conductor containing a conductive filler having an average particle diameter larger than an average diameter of the fine particles. peeling the mold-releasing films and layering metal foils on the surfaces of the dielectric substrate, compressing the dielectric substrate having the metal foils by applying heat and pressure in order to adhere the dielectric substrate and the metal foils and to connect electrically the metal foils with each other, and forming the metal foils to have a predetermined pattern, wherein the mixture of the thermosetting resin with the fine particles is dispersed throughout the entire thickness of the glass cloth or the glass nonwoven fabric.