Abstract:
PROBLEM TO BE SOLVED: To provide a multilayer wiring board making it possible to mount a surface mount component having a narrow pitch, while increasing a wiring housing amount and suppressing a warpage amount.SOLUTION: A multilayer wiring board includes: a first metal foil wiring layer having at least two layers of metal foil wiring, arranged on a side of a mounting face for mounting a surface mount component; a wire wiring layer having an insulation coated wire, arranged on an inner layer side of the first metal foil wiring layer; a second metal foil wiring layer arranged on a side opposite to a mounting face for mounting the wire wiring layer; and an inter-layer conduction hole electrically connecting the metal foil wiring on a surface of the first metal foil wiring layer to the metal foil wiring in the inner layer of the first metal foil wiring layer or the insulation coated wire of the wire wiring layer or the second metal foil wiring. A hole diameter of the inter-layer conduction hole varies in a plate-thickness direction of the multilayer wiring board.
Abstract:
A circuit substrate includes a base layer, a patterned conductive layer, a dielectric layer, an outer pad and a conductive block. The patterned conductive layer is disposed on the base layer and has an inner pad. The dielectric layer is disposed on the base layer and covers the patterned conductive layer. The outer pad is disposed on the dielectric layer. The conductive layer is passed through the dielectric layer and connected between the outer pad and the inner pad, wherein the outer pad and the conductive block are formed as an integrative unit, and an outer diameter of the outer pad is substantially equal to an outer diameter of the conductive block.
Abstract:
PROBLEM TO BE SOLVED: To provide a technique capable of reducing thermal stress generated at a wiring board without the need to separately provide a via for electrically connecting a via for connecting a core and a conductive core base material, in the wiring board having the core base material and a plurality of through-hole vias.SOLUTION: A method for manufacturing the wiring board comprises the steps of: forming an outside through-hole in the core base material; filling the outside through-hole with an insulation resin; forming a first conductive layer on the surface of the insulation resin at a part on which the via for connecting a core is formed; forming a land around the first conductive layer; stacking a wiring layer on the core base material after the step of forming the first conductive layer and the step of forming the land; forming an inside through-hole which has a diameter smaller than that of the outside through-hole and penetrates the core base material and the wiring layer, so as to penetrate the insulation resin; and covering an inner wall surface of the inside through-hole with a first conductive film. The core base material and the first conductive film are electrically connected through the first conductive layer and the land.
Abstract:
PROBLEM TO BE SOLVED: To provide a wiring board which can improve reliability by providing bump electrodes appropriate for connection with a component.SOLUTION: A wiring board 101 of an embodiment has a structure in which a plurality of bump electrodes 11 are arranged on a substrate principal surface 102 in an electrode formation region. At least one of the plurality of bump electrodes 11 is an odd-shaped bump electrode 11 having a depression 13 on a top face 12 and formed such that an outer diameter A1 at a top edge is larger than an outer diameter A2 at a bottom edge and a cross-section shape as a whole is an inverted trapezoid.
Abstract:
PROBLEM TO BE SOLVED: To eliminate the need for a separate PSR process because a deflection of a board is prevented during and after manufacturing of the board and a support prevents the deflection of the board and has a function of a solder resist layer.SOLUTION: In a manufacturing method, a circuit pattern (56) is formed on a double-sided or single-sided copper-clad laminate, a build-up layer (57) is laminated on its top, and then a solder resist layer (58) is formed on an upper surface of the build-up layer (57). Thus, an insulating resin layer (50), having a via hole (54), comprising a first circuit layer including the circuit pattern (56), which is formed on one side, and a second circuit layer including a connecting pad for mounting a solder ball projecting over the via hole (54), which is formed on the other side, the build-up layer (57) including a number of insulating layers and circuit layers formed on the first circuit layer and the solder resist layer (58) formed on the outermost layer of the build-up layer (57) are included.
Abstract:
PROBLEM TO BE SOLVED: To provide a printed circuit board capable of improving interlayer electrical connection by providing a cylindrical via formed from an electroplating layer, and capable of realizing a high-density circuit pattern by forming a line width of a circuit pattern connected to an upper portion of the via to be smaller than the diameter of the via, and to provide a method of manufacturing the same. SOLUTION: A printed circuit board is provided which includes a land (53) formed in a lower portion of an insulating layer, a circuit pattern (63) formed in an upper portion of the insulating layer, and a via (75) connecting the land (53) and the circuit pattern (63). The land (53) is constituted of a seed layer (20) and a first electroplating layer (51) of which one side is connected to the seed layer (20) and the other side is connected to the via (75), and the via (75) is constituted of a second electroplating layer. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a printed circuit board capable of ensuring a high reliability by expanding a contact area between a pad and a via by making the whole or part of the pad embedded in the via, and also to provide a method of manufacturing the same. SOLUTION: The printed circuit board includes a first insulation layer 20, a first via 22 which penetrates the first insulation layer 20, and a first pad 14 which is formed on one surface of the first insulation layer 20, with the whole or part of the first pad 14 being embedded in the first via 22. COPYRIGHT: (C)2009,JPO&INPIT