Abstract:
An object of the present invention is to provide a multilayered printed circuit board having a short wiring distance of the conductor circuits, wide option of the design of the conductor circuits and additionally excellent in reliability since cracking scarcely takes place in the interlaminar resin insulating layers in the vicinity of via-holes. The present invention is a multilayered printed circuit board comprising: a conductor circuit and an interlaminar resin insulating layer serially formed on a substrate in alternate fashion and in repetition, wherein a connection of the conductor circuits through the interlaminar resin insulating layers is performed by a via-hole, wherein via-holes in different level layers among the via-holes are formed so as to form a stack-via structure, and wherein at least one of the land diameters of the above-mentioned via-holes in different level layers having the stack via structure is different from the land diameters of other via-holes.
Abstract:
An insulator is provided between interconnect layers oppositely placed. The interconnect layers are connected between by connection members provided through the insulator. The connection members at one and the other ends are connected between in their center positions. A shield layer is provided spaced from the intermediate connection layer generally on a same plane as the intermediate connection layer. The interconnect layers where considered generally as a circular cylinder have a diameter m, and the intermediate connection layer where considered generally as circular has a diameter r, r
Abstract:
A printed wiring board in which an opening existing around a pad which is a photovia land is arranged so that it is not overlapped with the pad, the area of an opening existing around a pad and that of another opening are equalized, the quantity of resin which is filled in each opening or is equalized throughout a printed wiring board and the quantity of resin overflowing from each opening or when resin is filled in each opening or is uniformed is provided. According to such a printed wiring board, a reliable printed wiring board wherein secure connection is enabled without causing disconnection can be realized when a circuit pattern provided on an interlayer insulating board formed on the printed wiring board and a conductor pad are connected by arranging an opening existing around a conductor pad so that it is not overlapped with the conductor pad and substantially equalizing the quantity of resin which is filled in an opening around a conductor pad and that of resin which is filled in another opening.
Abstract:
An interconnect system for linking integrated circuits (ICs) mounted on a surface of a printed circuit board (PCB) includes a trace positioned below the surface, one or more vias linking the trace to the surface of the PCB, and other conductors linking pads on the ICs to the vias. Impedances of the various components of the interconnect system are sized relative to one another to optimize interconnect system frequency response.
Abstract:
A multilayer resin wiring board includes a metal core substrate having a first main surface and a second main surface; a plurality of wiring layers located on the first and second main surfaces of the metal core substrate; a plurality of insulating resin layers, each intervening between the metal core substrate and the wiring layers and between the metal core substrate and the wiring layers and between the wiring layers; and a via formed on the wall of a through hole for connection to the metal core substrate extending through the insulating resin layers and the metal core substrate so as to establish electrical conductivity to the metal core substrate. The metal core substrate has a thin portion which is thinner than the remaining portion of the metal core substrate. The through hole for connection to the metal core substrate is formed through the thin portion by laser machining.
Abstract:
A printed wiring board in which an opening existing around a pad which is a photovia land is arranged so that it is not overlapped with the pad, the area of an opening existing around a pad and that of another opening are equalized, the quantity of resin which is filled in each opening or is equalized throughout a printed wiring board and the quantity of resin overflowing from each opening or when resin is filled in each opening or is uniformed is provided. According to such a printed wiring board, a reliable printed wiring board wherein secure connection is enabled without causing disconnection can be realized when a circuit pattern provided on an interlayer insulating board formed on the printed wiring board and a conductor pad are connected by arranging an opening existing around a conductor pad so that it is not overlapped with the conductor pad and substantially equalizing the quantity of resin which is filled in an opening around a conductor pad and that of resin which is filled in another opening.
Abstract:
A multi-layer circuit board capable of reducing an electrical resistance between circuit patterns positioned inside the circuit board and a through-hole connection conductor. A plurality of circuit patterns are superposed on each other with a plurality of insulating layers being alternately interposed therebetween in turn. A solution in which ultrafine metal particles of the independent dispersion type such as silver, gold, palladium or the like are contained in a colloid-like manner is applied so as to extend from one of lands through an inner surface of a through-hole to the other land. Then, the solution is calcined to form a metal particle film, The metal particle film is coated thereon with a conductive paste such as a resin/silver paste or the like, which is then calcined to form a conductive paste layer.
Abstract:
A multi-layer printed circuit board or card including at least one passage in at least one of the layers of the circuit board or card for preventing the diffusion of heat throughout the circuit board or card during the securing or removal of components in plated through holes in the circuit board or card by the heating of the plating material to a temperature above a melting point of the plating material.
Abstract:
A high density multilayer printed circuit board comprising generally parallel signal layers, electric source layers, and ground layers, with insulating layers arranged between the signal layers and the electric source layers, between the electric source layers and the ground layers, and between the ground layers and the signal layers respectively. Conductor portions are formed in through holes which are opened in a direction transverse to the signal layers, electric source layers, and ground layers. The conductor portions are electrically connected to the signal layers and/or the electric source layers, and/or the ground layers, through the lands thereof, the connections of the lands being substantially equally distributed among the conductor portions.
Abstract:
A wiring substrate includes a first conductor layer, an insulating layer formed on the first conductor layer, a second conductor layer formed on the insulating layer, a connection conductor penetrating through the insulating layer and connecting the first and second conductor layers, and a coating film formed on a surface of the first conductor layer and adhering the first conductor layer and the insulating layer. The first conductor layer includes a conductor pad in contact with the connection conductor such that the conductor pad has a surface having a first region and a second region on second conductor layer side and that surface roughness of the first region is different from surface roughness of the second region, and the conductor pad of the first conductor layer is formed such that the first region is covered by the coating film and that the second region is covered by the connection conductor.