Abstract:
A printed wiring board suitable for reliable connections and reliable high-density mounting of components by using solder bumps. The printed wiring board has a mounting surface on which are formed pads coated with solder resist and having solder bumps. The position of the solder bump is coincident with the position of a via-hole, or the size of an opening disposed in the solder resist is made greater than a land diameter of the via-hole so that the solder resist does not overlap with the via-hole.
Abstract:
A multilayered printed wiring board having a smooth surface, which can be improved in resolution, interlayer insulating property, or thermal shock resistance without lowering its peel strength even if its insulating resin layer is thin. In the printed wiring board in which the conductor circuits of upper and lower layers are electrically insulated from each other by means of the insulating resin layer, the insulating layer is constituted of a composite layer composed of a lower layer made of a heat-resistant resin which is hardly soluble in an acid or oxidizing agent and an upper layer made of a bonding agent for electroless plating composed of a heat-resistant resin and, as necessary, a recessed section formed between conductor circuits of the lower layer is filled with a resin to the level corresponding to the surfaces of the conductor circuits.
Abstract:
This invention is to provide a multilayer printed circuit board having excellent appearance and reliability and a method of producing the same, and proposes a build-up multilayer printed circuit board comprising an interlaminar insulating layer 4 comprised of an adhesive for additive process between an inner layer copper pattern 3 provided at its surface with a fine uneven layer 9 and an outer layer copper pattern 6 in which the surface of uneven layer 9 in the inner layer copper pattern 3 is covered with a metal layer containing one or more of metals having an ionization tendency not lower than that of copper but not higher than that of titanium, or a noble metal layer 10, and a production technique therefor.
Title translation:KLEBSTOFF ZUR STROMLOSEN PLATTIERUNG,ROHSTOFFZUSAMMENSETZUNG ZUR HERSTELLUNG EINES KLEBSTOFFS ZUR STROMLOSEN PLATTIERUNG UND GEDRUCKTE LEITERPLATTE
Abstract:
An adhesive for electroless plating and a printed wiring board each being advantageous for securing insulation reliability between wires and between layers while keeping a practical peel strength. Specifically an adhesive for electroless plating prepared by dispersing cured heat-resistant resin particles soluble in an acid or an oxidizing agent in an uncured heat-resistant resin matrix which becomes slightly soluble in an acid or an oxidizing agent upon curing treatment, characterized in that the heat-resistant resin particles have a mean particle size of less than 2 νm and comprise fine particles and coarse particles; and a printed wiring board made by using this adhesive.
Abstract:
An adhesive for electroless plating which is advantageous for ensuring the reliability of insulation between lines and between layers while maintaining the practical peeling strength. The adhesive comprises an uncured heat-resistant resin matrix which becomes difficultly soluble in acid or oxidant when cured and cured heat-resistant resin particles which are soluble in acid or oxidant and dispersed in the matrix. The adhesive is characterized in that the average particle diameter of the heat-resistant resin particles is not larger than 1.5 mu m.