Patent ID: 8413324
Filing Date: 2013-04-09
Classification: H05K,Y10T

Abstract:
1. A method for manufacturing a double-sided circuit board, comprising: preparing a substrate having a first surface and a second surface on an opposite side of the first surface; forming a first hole from the first surface of the substrate toward the second surface of the substrate such that the first hole is formed in the substrate and has a first opening with a diameter R forming a second hole from the second surface of the substrate toward the first surface of the substrate such that the second hole is formed in the substrate and has a second opening with a diameter R forming a third hole from one of a first surface side and a second surface side of the substrate toward the other one of the first surface side and the second surface side of the substrate such that the third hole has a diameter smaller than the diameter R forming a first conductive circuit on the first surface of the substrate; forming a second conductive circuit on the second surface of the substrate; and filling the penetrating hole with conductive material such that a through-hole conductor electrically connecting the first conductive circuit and the second conductive circuit is formed.