Abstract:
A fluid composition for producing a gold seed layer on a substrate for an electrical circuit, which comprises an organogold compound and an organosilver compound present as 0,5 to 10 parts by weight silver per 100 parts by weight gold. In preferred compositions, the silver is present as 0,8 to 6 parts by weight per 100 parts by weight gold.
Abstract:
Circuit boards having a unique resistor-/conductor junction are disclosed made by air firing thick film resistor (3) compositions overlapping a pattern of first metal conductors (2) which are thereafter plated with a low resistance metal (5) to form a plated conductor pattern.
Abstract:
A printed wiring board (10) for IC cards that can be built in or mounted on a contact-type IC card, i.e., on an IC card having external contact terminals. Bumpers (20) are formed on portions of conductor circuits (13) of the printed wiring board (10) for IC cards to make the bumpers (20) serve as external contact terminals. Thus, only the contact surfaces of the external contact terminals are exposed on the surface of the IC card (30) with the contact surfaces being flush with the surface of an over sheet (14). Therefore, there is provided a printed wiring board (10) for IC cards which completely prevents the IC module (12) from jumping out when the IC card (30) is bent, and in which the external contact terminals exhibit excellent electric contact reliability.
Abstract:
Die Erfindung betrifft ein Verfahren zur Herstellung von dünnen Molybdän-Filmen, bei denen die elektrische Leitfähigkeit in großen Grenzen variiert und auf gewünschte Werte eingestellt werden kann, dadurch gekennzeichnet, daß eine molybdän-organische Verbindung in Gasform in eine Glimmentladungszone zersetzt wird.
Abstract:
A multilayer printed wiring board produced by buildup process. A first layer printed wiring pattern (13) is formed on a metal core (11) through a first insulation laminate (12), and a second layer printed wiring pattern (16) is formed on the first layer printed wiring pattern through through-studs (15) and a second insulation laminate (14). The surface of the first layer printed wiring pattern (13) is roughened and the through studs (15) are formed by buildup process a conductive paste on the roughened surface.
Abstract:
A multilayer ceramic substrate with multilayered circuit patterns, the improvement in which internal conductors for wiring are formed by a Ag base conductive materials capable of being co-fired with multilayered green ceramic substrate sheets in an oxidizing atmosphere and external conductors electrically connected with the internal conductors are formed by a Cu base conductive material, the external Cu conductors being formed in such a manner so that a liquid phase of Cu-Ag is not formed at the interface of the Cu conductor and the Ag conductor. Further high reliable resistors of RuO₂ or Bi₂Ru₂O₇ type may be integrally formed onto and/or inside the substrate. In such an arrangement, problems or difficulties caused due to Ag migration, incomplete binder removal, solder leaching, etc., are eliminated and thereby there can be a multilayer substrate wit a high reliability and a high pattern precision.
Abstract:
57 The manufacturing process of printed circuit boards (pcb's), generally consisting of a support which on a major face or side carries circuit components according to the requested design and on its second major face or side carries the soldered wires corresponding to said circuit components, is now based on the fact that the designs of the component side, respectively of the soldering side are each transformed into labile electrostatic images on which good conductive metallic poweder (toner) is applied. The so obtained tracks are printed on insulating sheets (one printed with tracks reproducing the component side design, and an other with the tracks reproducing the solder side) and said printed sheets are fixed on the pcs rigid and thick support which is thereafter treated to enlarge adequately the conductive tracks.
Abstract:
Procédé pour la réalisation d'un circuit imprimé.
Selon l'invention, la plaquette isolante (1) est préalablement revêtue d'une couche métallique (2 ou 3) sur laquelle on réalise ledit circuit imprimé. Grâce à la liaison électrique établie par ladite couche métallique (2ou3) entre les éléments du circuit imprimé, il est possible de recouvrir certains d'entre eux (10, 15) d'une couche métallique inoxydable (19, 20) par électrodéposition.