| Patent application number | Description | Published |
|---|
| 20090084590 | CIRCUIT BOARD - A circuit board has a low thermal expansion coefficient that suits the thermal expansion coefficient of an element to be mounted thereupon and can prevent the occurrence of delamination and cracking of a core layer when the circuit board is used in a low temperature environment. The circuit board is constructed by laminating a core layer and at least one wiring layer, where the at least one wiring layer has slightly smaller external dimensions in a planar direction than the core layer. | 04-02-2009 |
| 20090196002 | PRINTED WIRING BOARD UNIT - A printed wiring board unit includes an electronic circuit component, a printed wiring board, a plurality of first conductive terminals disposed between the electronic circuit component and the printed wiring board, at least one of the first conductive terminals arranged along a quadrangular outline, and a plurality of second conductive terminals disposed between the electronic circuit component and the printed wiring board, the second conductive terminals arranged at a corner of the quadrangular outline, and the second conductive terminals contacting at least one of the printed wiring board and the electronic circuit component in a relatively displaceable manner. | 08-06-2009 |
| 20090294056 | METHOD OF MAKING PRINTED WIRING BOARD AND METHOD OF MAKING PRINTED CIRCUIT BOARD UNIT - The first support body is pressed against the second support body in response to the softening of the adhesive sheet. The fillers are allowed to reliably contact with one another between the first electrically-conductive land and the second electrically-conductive land. The fillers melt after the adhesive sheet has been softened. The intermetallic compounds are formed between the fillers and the electrically-conductive lands and between the fillers. Electrical connection is in this manner established between the first electrically-conductive land and the second electrically-conductive land. The matrix material and the adhesive sheet are then cured. The first support body and the second support body are firmly bonded to each other. | 12-03-2009 |
| 20090294160 | METHOD OF MAKING PRINTED WIRING BOARD AND ELECTRICALLY-CONDUCTIVE BINDER - A thermosetting resin sheet is sandwiched between first and second support bodies so that a first electrically-conductive land on the first support body is opposed to a second electrically-conductive land on the second support body in an opening formed in the sheet. The opening is filled with an electrically-conductive binder. The electrically-conductive binder includes matrix material containing a thermosetting resin and fillers including copper particles dispersed in the matrix material. The copper particles have the surface coated with a tin-bismuth alloy. When heat is applied to the electrically-conductive binder, the tin-bismuth alloy melts. The tin forms an intermetallic compound on the surface of the individual copper particle. The copper-tin alloy layers serve to unit the copper particles together. Electrical connection is established. The bismuth embeds the copper particles. The bismuth is hardened or cured. The matrix material is then hardened or cured. | 12-03-2009 |
| 20100014254 | Printed circuit board unit and semiconductor package - A terminal bump set including the outermost bump row inscribed in a first prism standing upright on the front surface of a package substrate. A heat conductive member contacts with the surface of the semiconductor element. The heat conductive member extends outward beyond the contour of the semiconductor element. A reinforcing member is interposed between the heat conductive member and the package substrate outside the contour of the semiconductor element. The reinforcing member is bonded to the front surface of the package substrate at a predetermined bonding area. The predetermined bonding area extends inward from the outer periphery of the package substrate over the front surface of the package substrate. The second prism stands upright on the front surface of the package substrate inside the first prism so as to allow the outermost bump row to circumscribe the second prism. | 01-21-2010 |
| 20100326714 | PRINTED CIRCUIT BOARD, PRINTED CIRCUIT BOARD FABRICATION METHOD, AND ELECTRONIC DEVICE INCLUDING PRINTED CIRCUIT BOARD - A printed circuit board include: a printed circuit board main body having a mounting area on a first surface of the printed circuit board main body and a recess being provided at a recess area on a second surface that is a back side of the first surface of the printed circuit board main body, the electronic component being mounted on the mounting area, the recess area being provided to correspond to the mounting area; and a thermal expansion control element being placed in the recess and having a smaller thermal expansion coefficient than the printed circuit board main body. | 12-30-2010 |
| 20110100690 | ELECTRICALLY CONDUCTIVE BODY AND PRINTED WIRING BOARD AND METHOD OF MAKING THE SAME - An electrically conductive body includes: a first electrically conductive material; a second electrically conductive material; and a bonding material bonding the first electrically conductive material to the second electrically conductive material at least for electric conduction. The bonding material is made of a metallic structure containing copper-tin based intermetallic compound phases and tin-bismuth phases, the copper-tin based intermetallic compound phases being continuous between the first electrically conductive material and the second electrically conductive material, the tin-bismuth phases being surrounded by the copper-tin based intermetallic compound phases. | 05-05-2011 |
