Abstract:
PROBLEM TO BE SOLVED: To provide a circuit board manufacturing method used to manufacture a circuit board having a locally high wiring density, simplifying steps and reducing a manufacturing cost. SOLUTION: The circuit board manufacturing method includes the following steps. First, a master substrate is cut and divided into a plurality of slave substrates. Then, the slave substrate is disposed in an opening in an inner layer circuit board. The inner layer circuit board has a first circuit layer, a second circuit layer, and a core layer positioned between the first circuit layer and the second circuit layer, wherein the wiring density of the slave substrate is higher than that of the inner layer circuit board. Then, insulating films and metal foil pieces are disposed on the both mating sides of the slave substrate and the inner layer circuit board, and the hot press joining step is performed to integrally couple the metal foil pieces and the insulating films on the both mating sides with the slave substrate and the inner layer circuit board. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a circuit substrate structure containing a composite material, and to provide a method of forming a composite material circuit substrate structure. SOLUTION: The composite material circuit substrate structure includes a substrate, a composite material dielectric layer, and a patterned conductor layer. The composite material dielectric layer is located on the substrate, and includes a catalyst dielectric layer and a passivation dielectric layer. The catalyst dielectric layer contains a dielectric material and catalyst granules and contacts the substrate. The passivation dielectric layer contains a dielectric material and contacts the catalyst dielectric layer. The patterned conductor layer is located on the catalyst dielectric layer. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To avoid occurrence of voids or bubbles, when forming a conductive film through electroplating. SOLUTION: A circuit connecting structure, attached to a circuit support includes at least two insulating layers, two conductive layers, and one conductive pad, and via holes are formed from sides of respective insulating layers, through corresponding insulating layers. One of the two insulating layers is provided on the other insulating layer. The conductive pad is provided in between the two insulating layers, and two surfaces of the pad are connected to two via holes, respectively. Each of the two conductive layers is formed within the via holes, formed at one side of the circuit connection structure and is connected to the conductive pad. Since the ratio of the depth to the width of the via hole is decreased according to the circuit connection structure, occurrence of voids and bubbles is avoided effectively, and consequently, the reliability of the manufacturing method of the structure is improved. COPYRIGHT: (C)2006,JPO&NCIPI