Abstract:
A wiring board has an insulating layer, a plurality of wiring layers formed in such a way as to be insulated from each other by the insulating layer, and a plurality of vias formed in the insulating layer to connect the wiring layers. Of the wiring layers, a surface wiring layer formed in one surface of the insulating layer include a first metal film exposed from the one surface and a second metal film embedded in the insulating layer and stacked on the first metal film. Edges of the first metal film project from edges of the second metal film in the direction in which the second metal film spreads. By designing the shape of the wiring layers embedded in the insulating layer in this manner, it is possible to obtain a highly reliable wiring board that can be effectively prevented from side etching in the manufacturing process and can adapt to miniaturization and highly dense packaging of wires.
Abstract:
PROBLEM TO BE SOLVED: To provide a wiring board having excellent reliability in connection with a semiconductor chip.SOLUTION: An organic wiring board 10 comprises a first build-up layer 31 formed on a substrate principal surface 11 side, in which resin insulation layers 21-23 and a conductor layer 24 are laminated. The conductor layer 24 in an uppermost layer in the first build-up layer 31 includes a plurality of connection terminal areas 41 for flip-chip mounting semiconductor chips, respectively. The plurality of connection terminal areas 41 are exposed on openings 43 of a solder resist 25. Each connection terminal area 41 has a connection region 51 of a semiconductor chip, and a wiring region 52 extending from the connection region 51 in a plane direction and having a width narrower than that of the connection region 51. Solder wettability of a surface of the wiring region 52 is lower than solder wettability of a surface of the connection region 51.
Abstract:
PROBLEM TO BE SOLVED: To provide an electroless surface treatment plated layer of a printed circuit board, a method for preparing the same, and a printed circuit board including the same.SOLUTION: The present invention relates to: an electroless surface treatment plated layer including electroless nickel (Ni) plated coating/palladium (Pd) plated coating/gold (Au) plated coating, each of the electroless nickel, palladium, and gold plated coatings having a thickness of 0.02 to 1 μm, 0.01 to 0.3 μm, and 0.01 to 0.5 μm, respectively; a method for preparing the same; and a printed circuit board including the same. According to the present invention, in the electroless surface treatment plated layer of the printed circuit board, a thickness of the nickel plated coating is specially minimized to 0.02 to 1 μm, which makes it possible to form an optimized electroless Ni/Pd/Au surface treatment plated layer.
Abstract:
A wiring board includes an external connection terminal of a cylindrical shape, in which an electrode terminal of the electronic component to be mounted is fitted. In one configuration, a portion of the external connection terminal is electrically connected to a pad portion formed on an electronic component mounting surface side of the wiring board, and the external connection terminal is curvedly formed in such a shape that the outer periphery of the electrode terminal comes into close contact with the inner periphery of the middle portion of the external connection terminal when the electrode terminal is inserted into the external connection terminal.
Abstract:
PROBLEM TO BE SOLVED: To inexpensively provide a conductive particle which can maintain a sufficient insulating characteristic and a conduction characteristic even in connection of a minute circuit, is excellent in anti-hygroscopicity, and can provide an anisotropic conductive adhesive.SOLUTION: A coated conductive particle 5 comprises: a composite conductive particle 3 having a resin particle 4 and a metal layer 6 for coating the resin particle 4, and an insulating fine particle 1 provided in an outside of the metal layer 6, and for coating a part of a surface of the metal layer 6. The metal layer 6 comprises a nickel-palladium alloy plated layer 6a.