Abstract:
A protective circuit device (3) according to the present invention prevents overcharge to a storage battery (2). Protective circuit device (3) has a circuit board body (32) with a prescribed circuit pattern, and island portions (33, 34) having on their surfaces a plurality of external terminals (30) and connected to circuit board body (32) through a metal piece (35, 36). Island portions (33, 34) preferably includes first and second islands. First island (33) preferably has an external terminal (30) and is parallel to circuit board body (32). Second island (34) is preferably arranged between first island (33) and circuit board body (32) and is vertical to circuit board body (32).
Abstract:
There is disclosed herein a printed circuit board 50 having reinforced solder joints, comprising: a substrate 11 having mounting pads 14 arranged thereon; a surface mount component 13 having terminations 12, wherein the component 13 is disposed on the substrate 11 with each termination 12 being registered atop a respective mounting pad 14; a solder joint 10 connecting each termination 12 with its respective mounting pad 14; and a thin metallic member 30 disposed within each solder joint 10 between each termination 12 and its respective mounting pad 14. A method for producing such reinforced solder joints is also disclosed.
Abstract:
Bei Herstellungsprozessen von Leiterplatten auftretende Fehler an den Leiterbahnen (4) können durch geeignete Verfahren repariert werden. Die besondere Ausbildung der Leiterbahnen in Mäanderform und deren Miniaturisierung erfordert eine völlig neue Vorgehensweise. Die Abmessungen heutiger Leiterbahnen (4) beträgt beispielsweise: Breite x Höhe = 70 µm x 20 µm. Zur Reparatur derartiger Leiterbahnen (4), die meist sehr eng auf einem Leiterbahnträger (6) angeordnet sind, ist es notwendig, die zur Reparatur eingesetzten Formteile (2) absolut deckungsgleich auf die Leiterbahnunterbrechung (1) zu positionieren und bis zur vollständigen Herstellung der Verbindungszonen (7) zwischen Formteil (2) und Leiterbahn (4) zur arretieren. Dies wird durch den Einsatz einer Isolierfolie (3) mit Arbeitsfenstern (5) und einem sogenannten Formteilnutzen (15), das mehrere Formteile (2) enthält, erreicht. Das Formteil (2) wird durch ein erstes Elektrodensystem (8;9) mittels Widerstandserwärmung mit der Leiterbahn (4) verbunden und durch ein zweites Elektrodensystem (12;13) aus dem Formteilnutzen (15) herausgetrennt.
Abstract:
A composite bead element comprises a chip-like magnetic body (10) in a shape of a nearly rectangular parallelepiped in which a recess (11) is provided, at least one feed-through hole (12 to 14) formed in said body and an electronic component (20) inserted in said recess. Bead inductors are formed by conductors provided in said feed-through holes, and said electronic component and said conductors are connected by predetermined conductors (16 to 19) on a surface of said body.
Abstract:
A chip carrier mounting device includes a retaining member having a predefined pattern of apertures in which are positioned preforms of joint-forming matenal such as solder. The preform retains its general configuration after the interconnection or soldering process to form a resilient joint which is more capable of withstanding stress, strain and fatigue. The joint-forming material may be filled solder composition or a supported solder which substantially maintain their physical shape when the solder is molten, or a conductive elastomer.
Abstract:
@ An electronic device for an automobile is roughly divided into individual parts (5) and control circuit elements (2a) which are mounted in a casing (1) divided into two compartments (20, 30), according to the present invention. The individual parts (5) are arranged in one compartment (30) and are covered with silicon rubber to improve their water resistance. The control circuit elements (2a) are arranged in the other compartment (20) and are covered with a silicon gel to prevent any stresses acting upon the control circuit elements, such as ICs, and provide these elements with moisture resistance. The control circuit elements (2a) are bonded by high-temperature solder to improve their heat resistance, but the individual parts (5) are bonded by eutectic solder.