Abstract:
A wiring board comprises: an electrically insulated base material comprising a non-compressed member and a thermosetting member; a first wiring and a second wiring that are formed with the electrically insulated base material interposed therebetween; and via-hole conductors that penetrate the electrically insulated base material, and electrically connect the first wiring and the second wiring. The via-hole conductors comprise resin sections and metal sections. The metal sections comprise first metal sections the main ingredient of which is Cu, second metal sections the main ingredient of which is Sn-Cu alloy, and third metal sections the main ingredient of which is Bi. The second metal section is larger than the first metal section, and larger than the third metal section.
Abstract:
PROBLEM TO BE SOLVED: To provide a polymer thick film solder alloy/metal conductor compositions.SOLUTION: This invention provides a polymer thick film conductor composition comprising (a) a solder alloy powder selected from the group consisting of (i) a tin, silver, and copper alloy powder, (ii) a tin and bismuth alloy powder, and (iii) mixtures thereof, (b) a metal selected from the group consisting of silver, copper, gold, aluminum and mixtures thereof, and (c) an organic medium comprising a resin that is a vinyl co-polymer resin of vinylidene chloride and acrylonitrile or a phenoxy resin dissolved in an organic solvent, wherein the solder alloy powder and the metal are dispersed in the organic medium.
Abstract:
PROBLEM TO BE SOLVED: To reduce a via-hole resistance, and increase the strength of a via-hole part in a multilayer wiring board in which a conductive paste having copper powder and solder powder is used for a via-hole conductor.SOLUTION: The multilayer wiring board 110 has: an electrically insulative base material 130 composed of an incompressible member; a plurality of wiring lines 120; and a via-hole conductor 140. The via-hole conductor 140 comprises: a resin part 200; and a metal part 190 including at least a first metal region 160 consisting primarily of copper, a second metal region 170 consisting primarily of a tin-copper alloy, and a third metal region 180 consisting primarily of bismuth. The second metal region 170 is larger than a discrete piece of the first metal region 160 and a discrete piece of the third metal region 180; in the second metal region 170, such pieces of the first and third metal regions 160 and 180 are sprinkled so as not to be in contact with one another. The second metal region 170 contains an intermetallic compound CuSnand an intermetallic compound CuSn; the ratio of CuSn/CuSn is 0.10 or less.
Abstract:
PROBLEM TO BE SOLVED: To provide an electronic apparatus which can improve reliability.SOLUTION: The electronic apparatus includes: a case 12; a printed circuit board contained in the case 12 and provided with a through-hole 21; and a fixing member 16 including a shaft 16A inserted in the through-hole 21 and a head 16B located at one end of the shaft 16A, and fixing the printed circuit board and the case 12. The electronic apparatus also includes: copper foil 23 provided on the printed circuit board; and a cover film 24 including an opening 25 configured to expose a part of the copper foil 23. The opening 25 is located at a position which is to be covered with the head 16B, and the cover film 24 covers the copper foil 23 at positions other than the position of the opening 25. The electronic apparatus further includes a conductive material provided on the copper foil 23 inside the opening 25 and configured to electrically connect the head 16B and the copper foil 23.