Abstract:
A printed-circuit board (39) includes a conductor circuit (31) for solder pads and a solder resist layer (38) on the conductor circuit (31), and openings (37, 36) for receiving solder are formed in the solder resist layer (38). The conductor circuit (31) includes a rough surface (32) processed with etching liquid containing a cupric complex and an organic acid, and the solder resist layer (38) is provided on the rough surface (32). In the printed-circuit board, closer and firm contact between the fine conductor circuit and the solder resist layer is obtained in the areas where solder bumps are formed, thus preventing a failure of electrical connection.
Abstract:
Over a board in which through-holes are formed, conductor circuits are formed on interlayer resin insulating layers. The through-holes have roughed inner walls and are filled with filling material. The parts where the filling material are exposed are covered with through-hole covering conductor layers. Further, via-holes formed directly above the through-hole covering conductor layers are connected to the conductor layers. The filling material is not separated from the through-holes, the connection reliability between the through-holes and the internal layer circuits is high and, further, high density wiring can be realized.
Abstract:
An improved wear resistant bump contact (Fig. 1, item 16) is produced by the inclusion of small particles (18) of hard materials in the conductive material of the contact bump, preferably by co-deposition at the time of electroplating of the bump bulk material. Desirable attributes of the small particles of hard material include small particle size, hardness greater than the hardness of the bulk material of the contact bump, compatibility with the plating conditions, and electrical conductivity. In one variation, the bump of metal-particle co-deposited material is coated by a thin cap layer (19) of noble, non oxidizing metal to prevent electrical erosion by arcing as contact is made and broken from the pad.
Abstract:
A method for constructing a feedthrough via connection and a corresponding apparatus includes a metallic plate (101). A solderable contact area (103), is located on the plate (101). Next, an electrically insulating adhesive layer (105) is disposed onto the plate (101). This adhesive layer (105) has a feedthrough via (106) disposed therethrough aligned with the contact area (103). Then, a substrate (109) is disposed onto the adhesive layer (105). This flexible substrate (109) has a via (110) disposed therethrough with a solderable area (111) disposed thereon. A quantity of solder (113) is disposed onto the solderable area (111), and the assembly (100) is heated so that the solder (113) flows into the vias (106) and (110), thereby providing an electrical connection including the solderable area (111) of the via (110), the solder (113), and the contact area (103). During this reflow step, the structure of the adhesive layer (105) acts as a soldermask preventing the solder (113) from flowing outside of an area defined by the via (106).
Abstract:
An electronic device having a plurality of electrodes is prepared for bonding with another electronic device by positioning metal bumps surrounded by a resin on selected electrodes. The bumps are then diamond turned to that the outer surfaces of all of them lie substantially in a plane. The resin is then removed.
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 vorliegende Erfindung betrifft Polymerformkörper mit leitfähigen, insbesondere elektrisch leitfähigen, Strukturen auf der Oberfläche, sowie ein Verfahren zur Herstellung dieser Polymerformkörper. Ein weiterer Aspekt der Erfindung betrifft die Verwendung eines Geräts zur Erzeugung der leitfähigen, insbesondere der elektrisch leitfähigen, Strukturen auf der Oberfläche des Polymerformkörpers. Zudem betrifft die Erfindung die Verwendung eines Klebstoffes, enthaltend Carbon Nanotubes (CNT), zum elektrisch leitfähigen Verbinden eines elektronischen Bauelements mit einem anderen elektrisch leitfähigen Bauteil oder Formteil. Die Erfindung betrifft zudem eine Leiterplatten-Anordnung, umfassend mindestens eine Leiterplatte mit mindestens einer elektrisch leitfähigen Leiterbahn. Bevorzugterweise umfasst die mindestens eine elektrisch leitfähige Leiterbahn eine Metallschicht, und/oder mindestens ein elektronisches Bauelement. Die Erfindung betrifft auch Verfahren zur Herstellung der erfindungsgemäßen Leiterplatten-Anordnungen.