摘要:
A multilayer printed wiring board is composed of a substrate provided with through-holes, and a wiring board formed on the substrate through the interposition of an interlaminar insulating resin layer, the through-holes having a roughened internal surface and being filled with a filler, an exposed part of the filler in the through-holes being covered with a through-hole-covering conductor layer, and a viahole formed just thereabove being connected to the through-hole-covering conductor layer. Without peeling between the through-holes and the filler, this wiring board has a satisfactory connection reliability between the through-holes and the internal layer circuit and provides a high density wiring.
摘要:
A multilayer printed wiring board is composed of a substrate provided with through-holes, and a wiring board formed on the substrate through the interposition of an interlaminar insulating resin layer, the through-holes having a roughened internal surface and being filled with a filler, an exposed part of the filler in the through-holes being covered with a through-hole-covering conductor layer, and a viahole formed just thereabove being connected to the through-hole-covering conductor layer. Without peeling between the through-holes and the filler, this wiring board has a satisfactory connection reliability between the through-holes and the internal layer circuit and provides a high density wiring.
摘要:
A multilayer printed wiring board is composed of a substrate provided with through-holes, and a wiring board formed on the substrate through the interposition of an interlaminar insulating resin layer, the through-holes having a roughened internal surface and being filled with a filler, an exposed part of the filler in the through-holes being covered with a through-hole-covering conductor layer, and a viahole formed just thereabove being connected to the through-hole-covering conductor layer. Without peeling between the through-holes and the filler, this wiring board has a satisfactory connection reliability between the through-holes and the internal layer circuit and provides a high density wiring.
摘要:
This invention is to propose a technique of producing a printed wiring board having an excellent adhesion property between an electroless plated film and an electrolytic plated film constituting a conductor circuit through a semi-additive process without causing the peeling of a plating resist and is a printed wiring board comprising conductor circuits formed on a roughened surface of an insulating layer, in which the conductor circuit is constituted with an electroless plated film at the side of the insulating layer and an electrolytic plated film at the opposite side and the electroless plated film located at the side of the insulating layer is formed so as to follow to the roughened surface of the insulating layer. This printed wiring board is produced by a semi-additive method wherein the electroless plated film is formed on the roughened surface of the insulating layer so as to follow to the roughened surface of the insulating layer.
摘要:
A printed wiring board is provided which includes an interlayer dielectric layer formed on a substrate from a curable resin having flaky particles dispersed therein. The printed wiring board is excellent in cooling/heating cycle resistance and packaging reliability while maintaining a satisfactory heat resistance, electrical insulation, heat liberation, connection reliability and chemical stability. Also a method of producing a printed wiring board is proposed in which an imprint method using a mold having formed thereon convexities corresponding to wiring patterns and viaholes to be formed being buried in an interlayer dielectric layer is used to form the wiring patterns and viaholes by transcribing the concavities of the mold to the interlayer dielectric layer. The imprint method permits to form the wiring patterns and viaholes but assures an easy and accurate transcription without any optical transcription or complicated etching. Thus, a multilayer printed wiring board excellent in insulation reliability and interlayer connection and having fine wiring patterns formed therein can be mass-produced extremely easily and inexpensively.
摘要:
Adhesive adhesive for electroless plating ensures insulation reliabilities between lines and between layers while maintaining a practical peel strength, and a printed circuit board using the adhesive are disclosed. The adhesive is formed by dispersing cured heat-resistant resin particles soluble in acid or oxidizing agent into uncured heat-resistant resin matrix hardly soluble in acid or oxidizing agent through curing treatment, in which the heat-resistant resin particles have an average particle size of not more than 2 &mgr;m, and comprised of rough particles and fine particles.
摘要:
A printed wiring board is provided which includes an interlayer dielectric layer formed on a substrate from a curable resin having flaky particles dispersed therein. The printed wiring board is excellent in cooling/heating cycle resistance and packaging reliability while maintaining a satisfactory heat resistance, electrical insulation, heat liberation, connection reliability and chemical stability. Also a method of producing a printed wiring board is proposed in which an imprint method using a mold having formed thereon convexities corresponding to wiring patterns and viaholes to be formed being buried in an interlayer dielectric layer is used to form the wiring patterns and viaholes by transcribing the concavities of the mold to the interlayer dielectric layer. The imprint method permits to form the wiring patterns and viaholes but assures an easy and accurate transcription without any optical transcription or complicated etching. Thus, a multilayer printed wiring board excellent in insulation reliability and interlayer connection and having fine wiring patterns formed therein can be mass-produced extremely easily and inexpensively.
摘要:
The adhesive for electroless plating which is advantageous to ensure insulation reliabilities between lines and between layers while maintaining a practical peel strength, and the printed circuit board using the adhesive are disclosed. The adhesive is formed by dispersing cured heat-resistant resin particles soluble in acid or oxidizing agent into uncured heat-resistant resin matrix hardly soluble in acid or oxidizing agent through curing treatment, in which the heat-resistant resin particles have an average particle size of not more than 1.5 &mgr;m.
摘要:
A multi-layer printed wiring board includes a board covered with a conductor layer, an interlayer insulating resin layer, an etched metal film on the interlayer insulating resin layer, and a via hole. The interlayer insulating resin layer has a fibrous substrate. The via hole has an electrolytic plated film and an electrolessly plated film and connects the conductor layer of the board and the etched metal film.
摘要:
A multilayer printed-circuit board is provided which is formed by stacking one on the other a plurality of circuit boards, each including a hard insulative substrate having a conductor circuit formed on one or either side thereof, and having formed therein via-holes formed through the hard insulative substrate to extend to the conductor circuit and each filled with a conductive substance, with an adhesive applied between the plurality of circuit boards, and heating and pressing the circuit boards together. One of the outermost ones of the stacked circuit boards has formed on the surface thereof conductive bumps each positioned right above the via-hole and electrically connected to the via-hole, and the other outermost one of the stacked circuit boards has formed on the surface thereof conductive pin or balls each positioned right above the via-hole and electrically connected to the via-hole. This multilayer printed-circuit board is used as a package circuit board and electronic components such as LSI chip are mounted on it to form a semiconductor device. The multilayer printed-circuit board is used as a core substrate, and a build-up wiring layer is formed on one or either side of the core multilayer circuit board. Solder bumps are formed on the surface of one outermost conductor circuit of the build-up wiring layer and conductive pins or balls are provided on the surface of the other outermost conductor circuit of the build-up wiring layer. Thus, a multilayer printed-circuit board is provided on which wiring can be made densely and also electronic components can be mounted with a high density.