Patent ID: 7286367
Filing Date: 2007-10-23
Classification: H01L,H05K

Abstract:
1. A multilayer printed circuit board with a built-in capacitor comprising: a plurality of resin films, each of which is made of thermoplastic resin and has a plurality of via-holes at predetermined positions, wherein each resin film of a part of the resin films has a via-hole at a predetermined position in the stacking direction; a plurality of conductive patterns, which are located on the resin films; and a plurality of conductive pattern interconnecting members, which are located in the via-holes to electrically interconnect the conductive patterns, the conductive patterns being electrically separated by the resin films, wherein two of the conductive patterns are respectively located on a first surface and a second surface, which is opposite to the first surface, of one of the resin films, the two conductive patterns overlapping, wherein the entirety of the two of the conductive patterns are not penetrated by the via-holes, wherein the two of the conductive patterns and the one of the resin films make up a capacitor, wherein the via-holes in each of the resin films are separate from the other via-holes in the other resin films, wherein the resin films are capable of being press-bonded with heat so that the resin films are bonded and collectively stacked, wherein the capacitor is provided by the two of the conductive patterns sandwiching only the one of the resin films, wherein the one of the resin films is thinner than the rest of the resin films, wherein the dielectric constant of the one of the resin films is higher than those of the rest of the resin films, and wherein the plurality of resin films includes three or more resin films.