Abstract:
A process for forming a contact bump (18) in an electrically conductive contact pad (15) having top and bottom surfaces supported on a dielectric substrate (12) that includes the steps of removing a portion of the substrate (12) underlying the contact pad to form an aperture (20) and expose a portion of the bottom surface of the pad; upwardly deforming the pad (16) by applying force to its exposed bottom surface to form the bump (18); and filling the aperture behind the bump with a supporting substance (26).
Abstract:
An antistatic pressure-sensitive adhesive tape, particularly for use in masking printed circuit boards during wave soldering, comprises 1. a polymeric film support (4) e.g. of polyimide film; 2. an intermediate electrically conductive layer (5, 12) e.g. of polymeric binder (7) containing relatively small electrically conductive filler particles (6), or a metal foil (12); and 3. a layer of pressure-sensitive adhesive (8, 15), the adhesive either containing relatively large electrically-conductive particles (9) which provide conductive pathways from one main face (3) of the adhesive layer to the other (11), or being penetrated by protrusions (14) from the intermediate layer (12) which provide such pathways, the polymeric film support, intermediate layer and adhesive layer all being resistant to temperatures up to 250 o C for up to 5 seconds.
Abstract:
Bei einer Leiterplatte (1) mit einer Leiterbahn (13) die von einem Schleifkontakt (2) abtastbar ist, ist die Leiterbahn (13) durch ein gesondertes Bauteil aus einem abriebfesten elektrisch leitenden Werkstoff gebildet und auf einem plattenförmig gestalteten Träger (11) aus einem Isolierwerkstoff angeordnet. Durch diese Ausgestaltung ist es nicht nur möglich, die Leiterplatte (1) auf sehr wirtschaftliche Weise herzustellen, sondern deren Leiterbahn (13) weist auch eine hohe Maßgenauigkeit auf, so daß Schaltpunkte exakt festzulegen und eine hohe Standzeit gegeben sind. Des weiteren wird erreicht, daß ein Prellen des Schleifkontaktes (2) nahezu ausgeschlossen ist und daß eine Potentialbildung zwischen diesem und der Leiterplatte (1) vermieden wird.
Abstract:
A busbar interconnecting structure consists of a tab formed integral with one busbar and a slot formed in another busbar. The two busbars are firmly connected by pressing the tab into the slot. The slot has the inner surfaces of its shorter sides formed in an arc so that even when the tab is inserted misaligned into the slot, a four-point contact is obtained at all times between the tab and the slot. The slot is also provided at the shorter sides with risers whose inner surfaces are also formed in an arc shape to increase the contact area between the tab and the slot, thus assuring a more stable electrical contact. The tab, when viewed in cross section, may be rounded at the shorter sides to match the curvature of the internal arc surfaces of the slot, thereby providing a still more stable surface contact.
Abstract:
Le boîtier comprend un fond 1 dans l'épaisseur duquel est noyée l'extension d'une broche 5 d'entrée/sortie du boîtier. Cette extension se termine par un plot de contact 15 qui affleure à la surface d'un substrat 7 portant des composants électroniques passifs ou actifs 11, 12 et des pistes conductrices d'interconnexion 10, 10′, 10˝. Une piste conductrice 10 passant sur une découpe 6 du substrat qui loge le plot 15 est soudée sur ce plot pour interconnecter une borne 14 du composant 12 avec la broche 5 d'entrée/sortie du boîtier. On s'affranchit ainsi d'une interconnexion par plots latéraux 13, 13′, 13˝,... qui complique la topographie des pistes conductrices à prévoir à cet effet. Application à un boîtier pour circuit utilisé en électronique automobile.
Abstract:
A method of forming interconnections (84) of a coreless-brushless motor comprises the steps of laminating conductor layers (72a, 72b) formed on insulating sheets (83) with an insulating layer (82) interposed between adjacent ones of them, making a through hole (85) in the laminated structure to extend through the conductor layers (72a, 72b), the insulating sheets (83) and the insulating layers (82), pressing a connecting conductor pin (86), plated with solder (87) into the through hole (85) and supplying current to the connecting conductor pin (86) to melt the plated solder (87) and to connect the conductor layers (72a, 72b) to the conductor pin (86).