Abstract:
A printed circuit board (PCB) assembly having a plurality of circuit layers including outer layers and intervening layers with through-vias and micro-vias used to translate a portion of the signal connections of the grid, thereby creating a set of diagonal routing channels between the vias on internal layers of the board and a BGA package mounted on the printed circuit board.
Abstract:
A method of formation of a capacitor forming part of an electric circuit when producing a circuit board, consisting of forming a valve metal bottom electrode layer and a valve metal oxide dielectric layer on the same, then integrally forming a solid electrolyte layer comprised of an organic semiconductor and a top electrode layer comprised of metal on the same, this integral formation step consisting of the step of holding one surface of metal foil for the top electrode at a bonding wedge and making the other surface of the metal foil carry a powder of the organic semiconductor by compression bonding and heating and the step of compression bonding the organic semiconductor powder carried by compression bonding at the dielectric layer by a bonding wedge through metal foil, whereby a solid electrolyte layer comprised of an organic semiconductor sandwiched between the metal foil and dielectric layer and closely bonded with the two is formed, a capacitor built into a circuit board, a circuit board including a capacitor, and a method of production of the circuit board.
Abstract:
Wirings 2B1 are formed by application of heat treatment after an ink jet system is used to discharge a conductive liquid L onto a provisional substrate 5 having a predetermined repellent property, bonding an insulating layer 4B1 to the wirings 2B1 with an adhesive material 3B1 therebetween, peeling and removing the provisional substrate 5, and bonding and fixing the wirings 2B1 together with the insulating film 4B1 to a main substrate 1 by an adhesive material 3B1.
Abstract:
To provide a method of manufacturing a highly reliable circuit device realizing a smaller, thinner and lighter configuration. In the method of manufacturing a circuit device according to the invention, a resin sealed body is separated from a supporting substrate, after the resin sealed body containing a circuit device is formed on a top surface of the supporting substrate. Therefore, manufacture of a circuit device having no substrate becomes possible and it realizes a thinner and lighter circuit device with improved heat dissipation. Moreover, since sealing with a sealing resin can be performed on the supporting substrate, warps, caused by the differences in thermal expansion coefficients between the sealing resin and conductive patterns and between the sealing resin and circuit components, can be prevented. Hence, it becomes possible to prevent flaking of conductive patterns from the substrate and a poor contact between the conductive patterns and a metal thin wire, and consequently to manufacture a highly reliable circuit device.
Abstract:
A built-up printed circuit board includes stacked micro via-holes, each of which is provided for interconnection between layers in the printed circuit board, and in each of which a filling material, such as liquefied resin or conductive paste, is filled using a poly screen of a general screen printing machine.
Abstract:
A method is disclosed for fabricating a patterned embedded capacitance layer. The method includes fabricating (1305, 1310) a ceramic oxide layer (510) overlying a conductive metal layer (515) overlying a printed circuit substrate (505), perforating (1320) the ceramic oxide layer within a region (705), and removing (1325) the ceramic oxide layer and the conductive metal layer in the region by chemical etching of the conductive metal layer. The ceramic oxide layer may be less than 1 micron thick.
Abstract:
A conductive sheet according to the present invention includes: an insulating substrate having at least one via hole, a ground conductive layer; and a top conductive layer, and characterized in that the via hole is a fine pore penetrating through the insulating substrate, the ground conductive layer is formed by a sputtering method or a vapor deposition method on all of a surface of the insulating substrate, the top conductive layer is formed on all of or part of a surface of the ground conductive layer, and the via hole is filled with the top conductive layer.
Abstract:
A method for shielding one or more circuits (21, 21′) of a printed circuit board includes depositing a layer of dielectric material (43) over a printed circuit board substrate (22) and the printed circuits (21, 21′), creating a trench-like opening (44) in the dielectric layer (43) such that the trench-like opening (44) surrounds the one or more circuits (21, 21′) to be shielded, depositing a layer of metal (27) over the layer of dielectric material (43) and within the trench-like openings (44), creating a solder pad (24) at each location where an electrical connection is to be made to the printed circuits (21, 21′) by removing a border of the metal layer (27) surrounding each connection location, and providing a microvia (25) through each solder pad (24) penetrating the dielectric layer (43) and terminating at the metal of the printed circuit (21, 21′).
Abstract:
A method of fabricating an integrated circuit package, comprising prefabricating a film capacitor including forming a first conductive layer, depositing a dielectric layer on the first conductive layer, and depositing a second conductive layer on the dielectric layer; forming a substrate; and laminating the prefabricated film capacitor to the substrate.
Abstract:
A method of forming printed wiring boards having embedded thick-film capacitors includes covering capacitor layers with a protective coating prior to etching to prevent etching solutions from contacting with and damaging the capacitor layers and forming vias directly between the capacitor electrodes and the board circuitry.