摘要:
A two-sided printed circuit board including a base having a first surface, a second surface substantially parallel to the first surface, and a plurality of through-holes formed in the base; a first conductive layer provided on the first surface of the base; a second conductive layer provided on the second surface of the base; and a conductive particle buried in each of the through-holes in a pressurized state for electrically connecting the first conductive layer and the second conductive layer.
摘要:
A two-sided printed circuit board including a base having a first surface, a second surface substantially parallel to the first surface, and a plurality of through-holes formed in the base; a first conductive layer provided on the first surface of the base; a second conductive layer provided on the second surface of the base; and a conductive particle buried in each of the through-holes in a pressurized state for electrically connecting the first conductive layer and the second conductive layer.
摘要:
A connecting member of circuit substrates includes an organic porous base material provided with tackfree films on both sides, through-holes disposed at requested places which are filled with conductive resin compound up to the surface of the tackfree films. This structure enables inner-via-hole connection and can therefore attain a connecting member of circuit substrates and an electrical connector of high reliability and high quality. By using a connecting member of circuit substrates including the organic porous base material provided with tackfree films on both sides and through-holes disposed at requested places which are filled with conductive resin compound up to the surface of the tackfree films, it is possible to form a high-multilayer substrate easily from double sided boards or four-layer substrates which can be manufactured rather stably. In addition to that, since the conductive paste is filled up to the surface of the tackfree films, the conductive paste sticks out from the surface of the organic porous base material when the tackfree films are separated. As a result, the filled amount of the conductive substance increases after the lamination, and thus, the connection resistance is reduced considerably.
摘要:
A printed circuit board includes an uncured substrate material with closed voids which are disposed with a through-hole. When the through-hole is formed, voids which exist in the substrate material open from inner wall of the through-hole to form a hollow-shaped part. By filling the through-hole and the hollow-shaped part with conductive paste, the adhesion improves by the increased holding effect between the conductive paste and the wall surface of the through-hole.
摘要:
A printed circuit board includes an uncured substrate material with closed voids which are disposed with a through-hole. When the through-hole is formed, voids which exist in the substrate material open from inner wall of the through-hole to form a hollow-shaped part. By filling the through-hole and the hollow-shaped part with conductive paste, the adhesion improves by the increased holding effect between the conductive paste and the wall surface of the through-hole.
摘要:
A printed circuit board includes an uncured substrate material with closed voids which are disposed with a through-hole. When the through-hole is formed, voids which exist in the substrate material open from inner wall of the through-hole to form a hollow-shaped part. By filling the through-hole and the hollow-shaped part with conductive paste, the adhesion improves by the increased holding effect between the conductive paste and the wall surface of the through-hole.
摘要:
A connecting member of circuit substrates includes an organic porous base material provided with tackfree films on both sides, through-holes disposed at requested places which are filled with conductive resin compound up to the surface of the tackfree films. This structure enables inner-via-hole connection and can therefore attain a connecting member of circuit substrates and an electrical connector of high reliability and high quality.By using a connecting member of circuit substrates including the organic porous base material provided with tackfree films on both sides and through-holes disposed at requested places which are filled with conductive resin compound up to the surface of the tackfree films, it is possible to form a high-multilayer substrate easily from double sided boards or four-layer substrates which can be manufactured rather stably. In addition to that, since the conductive paste is filled up to the surface of the tackfree films, the conductive paste sticks out from the surface of the organic porous base material when the tackfree-films are separated. As a result, the filled amount of the conductive substance increases after the lamination, and thus, the connection resistance is reduced considerably.
摘要:
The present invention provides a printed circuit board in which electrode layers can electrically be connected by an inner-through-hole connection, the coefficient of thermal expansion of the board is equal to that of a semiconductor, high thermal conductivity can be obtained and wiring can be formed at a high density. A cover film is laminated on both surfaces of a resin impregnated fabric sheet, holes are formed by laser beams in the direction of the thickness of the sheet and cover film, an electrically conductive paste that contains the electrically conductive particles and a thermosetting resin is filled in the holes. The cover film is removed, a copper foil is placed on both sides of the sheet, and pressed and heated, and the resin component of the sheet and that of the electrically conductive paste are hardened. The copper foil is etched to form circuit patterns, and further etching removes the electrically conductive particles present at a surface layer portion so that an electrical insulating layer is thus formed.
摘要:
The present invention provides a printed circuit board in which electrode layers can electrically be connected by an inner-through-hole connection, the coefficient of thermal expansion of the board is equal to that of a semiconductor, high thermal conductivity can be obtained and wiring can be formed at a high density. A cover film is laminated on both surfaces of a resin impregnated fabric sheet, holes are formed by laser beams in the direction of the thickness of the sheet and cover film, an electrically conductive paste that contains the electrically conductive particles and a thermosetting resin is filled in the holes. The cover film is removed, a copper foil is placed on both sides of the sheet, and pressed and heated, and the resin component of the sheet and that of the electrically conductive paste are hardened. The copper foil is etched to form circuit patterns, and further etching removes the electrically conductive particles present at a surface layer portion so that an electrical insulating layer is thus formed.
摘要:
The invention related to a paste for via hole filling which enables inner via hole connection between electrode layers without employing through hole plating techniques, and a multi-layered printed circuit board using the same. The conductive paste composition of the invention comprises a) 70-90 wt % of copper particles of an average particle size of 0.5-8 .mu.m; b) 0.5-15 wt % of insulating particles of an average particle size of 8-20 .mu.m; and, c) 6-17 wt % of heat setting type liquid epoxy resin, in order to exhibit low viscosity and low volatility. The conductive paste is printed and filled into through holes passing through a laminated substrate which is provide with copper foils on both sides thereof, to form a printed circuit board in which the via holes are electrically connected after thermosetting. By adding insulating particles of large particle size, the amount of copper particles to be added is decreased so that a via hole connection of low specific resistance and high reliability is obtained, and improvements in a decrease of viscosity and continuous printability of the paste itself can be achieved.