Abstract:
A resin-sealed electronic circuit apparatus capable of maintaining a high heat-dissipating property and packaging density in applications where high hermetic-sealing property and durability are required. The electronic circuit apparatus comprises at least two wiring circuit boards (12, 13) on which electronic components are mounted. The wiring circuit boards (12, 13) are fixed to a heat sink (14) having a high heat conductivity via an adhesive (9, 10). The entirety of the wiring circuit boards (12, 13) and heat sink (14), as well as a part of an external connection terminal (8) are hermetically sealed and integrally molded by a thermosetting resin composition (7). The electronic circuit apparatus is small and highly reliable and can be provided at low cost.
Abstract:
A method for assembling a circuit card assembly (100) includes populating a plurality of components (110) on a top side of a component layer (105), performing component-level testing on at least one component of the plurality of components populated on the component layer, adhering a bonding layer (115) to a bottom side of the component layer, the bonding layer to facilitate bonding the component layer to an interconnect layer (120) and to provide connectivity between the plurality of components and the interconnect layer, and forming a single-sided circuit card assembly by adhering the interconnect layer to the bonding layer, the interconnect layer having a top side and a bottom side, the bonding layer adhered to the top side of the interconnect layer.
Abstract:
The invention relates to a power electronics component that comprises a planar ceramics substrate (2) on whose one face conductor tracks (6), applied in thick-film technique, are disposed for electrically connecting electrical power components (7) of a circuit that are also disposed on the ceramics substrate (2). The ceramics substrate (2), with its other face, is brazed onto a metal support element (1) that serves as a heat spreader. The support element (1) is linked with a thermoconducting housing part (9) of a housing that accommodates the support element (1) in a thermoconductive manner. On the face of the support element (1) facing away from the ceramics substrate (2), approximately opposite the ceramics substrate (2), a second ceramics substrate (4) is brazed onto the ceramics substrate (2) that carries the circuit and has approximately the same dimensions.
Abstract:
Eine Leiterplatte 10 zur Bestückung mit oberflächenmontierbaren (SMD) und mit drahtgebundenen Bauteilen 80, 70 ist mit einer ersten Substratschicht, die auf ihrer Bestückungsseite O eine Leiterbahnen 21 aufweisende Leitschicht 22 trägt und mit Durchgangsbohrungen 24 versehen ist, mit einer zweiten Substratschicht 30, die eine Bestückungsseite U aufweist und die mit Durchgangsbohrungen 34 versehen ist, wobei die Durchgangsbohrungen 24, 34 eine Metallisierung 50 aufweisen, und mit einer Zwischenschicht 40, die zwischen den Substratschichten 20, 30 angeordnet ist, ausgebildet, wobei die Durchgangsbohrungen 24, 34 in den Bestückungsseiten O, U der Substratschichten ausgebildet sind und kongruent übereinander liegen, wobei die metallisierten Durchgangsbohrungen 24, 34 elektrisch leitend mit den Leiterbahnen 21 der Leitschicht 22 der ersten Substratschicht verbunden sind, und wobei die Zwischenschicht 40 zumindest abschnittsweise in die Durchgangsbohrungen 24, 34 hineinragt. Die Zwischenschicht 40 ist im Bereich der Durchgangsbohrungen 24, 34 der Substratschichten 20, 30 mit Durchbrüchen 44 versehen, wobei die Lichte Weite d der Durchgangsbohrungen 44 in der Zwischenschicht 40 kleiner ist als der Durchmesser D der Durchgangsbohrungen 24, 34 in den Substratschichten 20, 30. Günstigerweise sind dabei die drahtgebundenen Bauteile 70 in der Zwischenschicht 40 kraft- oder reibschlüssig gehalten.
Abstract:
The present invention provides an electronic assembly 400 and a method for its manufacture 800, 900, 1000 1200, 1400, 1500, 1600, 1700. The assembly 400 uses no solder. Components 406, or component packages 402, 802, 804, 806 with I/O leads 412 are placed 800 onto a planar substrate 808. The assembly is encapsulated 900 with electrically insulating material 908 with vias 420, 1002 formed or drilled 1000 through the substrate 808 to the components' leads 412. Then the assembly is plated 1200 and the encapsulation and drilling process 1500 repeated to build up desired layers 422, 1502, 1702. Assemblies may be mated 1800. Within the mated assemblies, items may be inserted including pins 2202a, 2202b, and 2202c, mezzanine interconnection devices 2204, heat spreaders 2402, and combination heat spreaders and heat sinks 2602. Edge card connectors 2802 may be attached to the mated assemblies.
Abstract:
The present invention provides a substrate for a flexible printed wiring board including an adhesive layer containing an epoxy resin composition, insulating layers respectively stacked on both sides of the adhesive layer and formed with a pair of films containing a nonthermoplastic polyimide resin, and conductor layers respectively disposed on the outer surfaces of the films. The total thickness of the insulating layers respectively stacked on both sides of the adhesive layer is 10 to 100 µm and 2 to 10 times the thickness of the adhesive layer. The mutual adhesion strength between the insulating layers through the intermediary of the adhesive layer is 7.0 N/cm or more.
Abstract:
The invention relates to a power electronics component that comprises a planar ceramics substrate (2) on whose one face conductor tracks (6), applied in thick-film technique, are disposed for electrically connecting electrical power components (7) of a circuit that are also disposed on the ceramics substrate (2). The ceramics substrate (2), with its other face, is brazed onto a metal support element (1) that serves as a heat spreader. The support element (1) is linked with a thermoconducting housing part (9) of a housing that accommodates the support element (1) in a thermoconductive manner. On the face of the support element (1) facing away from the ceramics substrate (2), approximately opposite the ceramics substrate (2), a second ceramics substrate (4) is brazed onto the ceramics substrate (2) that carries the circuit and has approximately the same dimensions.
Abstract:
Zum Herstellen elektrisch leitender Verbindungen zwischen flachen Leiterbahnen (3, 4), die durch einen Isolierträger voneinander getrennt sind, werden zwei Metallfolien (1, 2), die mit Heißkleberschichten (5, 6) beschichtet sind, nebeneinandergelegt. An den Stellen der später herzustellenden und miteinander zu verbindenden Leiterbahnen (3, 4) sind Kontaktpunkte (7, 10) vorgesehen, an welche Drähte (8, 9, 10) angeschweißt werden, die, soweit sie auf der Ebene der Metallfolien (1, 2) verlaufen, durch Wärmezufuhr in die Schichten (5, 6) eingebettet werden. Anschließend werden die Metallfolien (1, 2) mit ihren Heißkleberschichten (5, 6) unter Zwischenlage des Isolierträgers gegeneinandergeklappt und durch Wärmezufuhr mit diesem verbunden. Nunmehr werden von den Metallfolien (1, 2) die Zwischenräume (13, 14) zur Bildung der Leiterbahnen (3, 4) abgeätzt.