Abstract:
Zur Wärmeabfuhr von auf einer Leiterplatte montierten Bauelementen ist auf die Leiterplatte (10) eine Kupferschicht (14) aufgebracht und auf diese Kupferschicht (14) eine Schicht (16) aus Reinaluminium aufgavanisiert. Die Leiterplatte (10) ist auf beiden Seiten mit Kupfer- und Reinaluminiumschichten (14,16) versehen, wobei die Bauelemente (12) jeweils auf einer solchen Kupfer- und Reinaluminiumschicht montiert sind. Die Leiterplatte (10) weist im Bereich der Bauelemente (12) Bohrungen (22) auf. Die Kupfer- und Reinaluminiumschicht (14, 16) erstreckt sich über die Innenwandung der Bohrung (22), so daß eine Verbindung (24) zwischen der mit dem Bauelement (12) in Kontakt befindlichen Kupfer- und Reinaluminiumschicht (14,16) und der Kupfer- und Reinaluminiumschicht auf der gegenüberliegenden Seite der Leiterplatte (10) hergestellt ist. Die aufgalvanisierte Reinaluminiumschicht (16) ist im Bereich der Bauteile (12) zur Erzielung einer planen Oberfläche mechanisch bearbeitet. In der Kupfer- und Reinaluminiumschicht (14,16) sind Bereiche (18) ausgespart, in denen Lötanschlüsse (20) und Leiterbahnen angeordnet sind.
Abstract:
A substrate structure (10) having contact pads (14) is mounted to a circuit board (70) which has pads (74) of conductive material exposed at one main face of the board and has registration features (78) which are in predetermined positions relative to the contact pads of the circuit board. The substrate structure (10) is provided with leads (34) which are electrically connected to the contact pads (14) of the substrate structure and project from the substrate structure in cantilever fashion. A registration element has a plate portion and also has registration features (78) which are distributed about the plate portion and are engageable with the registration features (76) of the circuit board, and when so engaged, maintain the registration element against movement parallel to the general plane of the circuit board. The substrate structure is attached to the plate portion of the registration element so that the leads are in predetermined positions relative to the registration features of the registration element. The registration features of the registration element are brought into engagement with the registration features of the circuit board, and in this position of the registration element the leads of the substrate structure (34) overlie the contact pads (74) of the circuit board. A clamp member (90) maintains the leads in electrically conductive pressure contact with the contact pads of the circuit board.
Abstract:
L'invention concerne les moyens de connexions entre des éléments de commande de petites dimensions -circuits intégrés- et des éléments commandés de plus grandes dimensions -têtes d'écriture ou panneau d'affichage-. Dans le but de réaliser une connectique de multiplexage simple, fiable et ne comportant qu'un seul niveau de conducteurs, le circuit souple (14) sur lequel sont portés les éléments de commande est directement utilisé comme moyen de connexion, et certains conducteurs sont dérivés (22), à la surface des pastilles (12) de semiconducteurs, pour éviter les croisements de liaisons multiplexées. Application aux dispositifs répétitifs à résistances chauffantes, photodiodes, plasmas, pour têtes de lecture ou écriture, ou pour panneau d'affichage.
Abstract:
A plurality of imaging modules, each including a solid-state imager mounted on an individual printed circuit board (PCB), is mounted in a reader, such as a bi-optical, dual window, point-of-transaction workstation, for capturing images along different fields of view of diverse targets useful for customer identification, customer payment validation, operator surveillance, and coded indicia. The imaging modules are individually mounted on a motherboard for individual installation at, and individual removal from, the reader.
Abstract:
An electronic device is provided that includes a main printed circuit board (PCB) (16) having a top surface (32), a bottom surface (34), and a hole (36) extending between the top surface and the bottom surface. The electronic device further includes a module PCB (18) having at least one electrical component (22,24) mounted on a top surface (38) of the module PCB, wherein the module PCB is inverted and assembled adjacent the main PCB such that the top surface of the module PCB faces the top surface of the main PCB, and the at least one electrical component extends into the hole. In addition, the electronic device includes a cover (26) on the bottom surface of the main PCB that substantially covers the hole.
Abstract:
The present invention relates to a method for manufacturing an electronic assembly (50) comprising an electronic component, a cavity and a substrate which method comprises; -providing an electronic component (10) having a first pattern with a substantially closed configuration; -providing a cover (18) on a surface of the electronic component, which cover together with said surface defines a cavity (20), the closed configuration of the first pattern substantially enclosing the cover at said surface; -providing a substrate (30) having a second pattern with a substantially closed configuration, which closed configuration at least partially corresponds to the closed configuration of the first pattern and comprises a solder pad; -disposing solder material at the solder pad; -positioning the electronic component and the substrate so as to align both the substantially closed configurations of the first and second pattern, while the substrate supports a top surface (28) of the cover; -reflow-soldering the solder material, therewith providing a soldered connection (52) between the first and second pattern. Furthermore the present invention relates to an electronic assembly (50), a cover (18) and a substrate (30).
Abstract:
Disclosed is a multilayer printed wiring board wherein a resin insulating layer and a conductor circuit are sequentially formed on another resin insulating layer containing a semiconductor device and the semiconductor device and the conductor circuit are electrically connected through a via hole. In the multilayer printed wiring board, the semiconductor device is placed in a recessed portion formed in the resin insulating layer, and a metal layer for mounting the semiconductor device is formed on the bottom surface of the recessed portion. Also disclosed is a semiconductor device-mounted substrate. In this multilayer printed wiring board, the built-in semiconductor device has an electrical connection through a via hole.
Abstract:
In einer Baugruppe sind ein Halbleiterchip (2) und ein weiteres Bauteil (3), beispielsweise ein starrer oder flexibler Schaltungsträger oder ein Leadframe durch einen Verbindungsstrang (4) miteinander verbunden. Der Verbindungsstrang (4) besteht aus einer elektrisch leitfähigen Masse, die in pastöser oder flüssiger Form auftragbar ist.
Abstract:
A PDP (600) is attached to a conductive substrate (31) through a heat dissipating sheet (60). A first drive circuit substrate (32) is fixed on the conductive substrate (31) by a plurality of conductive supports (34). On one plane of the first drive circuit substrate (32) facing the conductive substrate (31), one or a plurality of electronic components are mounted, and a second drive circuit substrate (40) is attached. A plurality of supporting terminals (43b) of the second drive circuit substrate (40) are connected to the first drive circuit substrate (32), and the first drive circuit substrate (32) is attached to the conductive substrate (31) by the conductive supports (34). Thus, one plane of the second drive circuit substrate (40) is brought into contact with the conductive substrate (31). On the other plane of the second drive circuit substrate (40) facing the first drive circuit substrate (32), one or a plurality of surface mounting components (36) are mounted.