Abstract:
A multi-layer printed wire board (PWB) structure optimized for improved drop reliability, reliable electrical connections under thermal load, and minimal thickness is provided, along with a mobile terminal, including the PWB. The PWB includes alternating conductive layers and insulative layers. The outermost three layers form an interconnect structure constructed of two conductive layers surrounding an insulative-coated conductive layer. The thicknesses of the various layers are optimized to have an increased resistance to mechanical shock resulting from, for instance, a drop onto a hard surface. In addition, the optimized PWB structure has a minimized thickness and an improved resistance to connection failures resulting from cyclical thermal loads.
Abstract:
A method for forming electrical interconnects (28) for printed circuit boards (32, 34) and the like includes the steps of laminating a first surface of a rigid dielectric substrate (10) with a first conductive laminate such that the first conductive laminate extends beyond at least one edge (35) of the dielectric substrate (10), patterning the first conductive laminate to define a plurality of electrical interconnects (28) which extend beyond the edge(s) (35) of the dielectric substrate (10), forming a plurality of conductive traces on a second surface of the dielectric substrate (10) and forming a plurality of openings in the dielectric substrate (10), each opening extending from a first location on the first surface of the dielectric (10) which is proximate at least one electrical interconnect to a second location on the second surface of the substrate (10) which is proximate at least one conductive trace. Conductive material is formed within the openings of the dielectric substrate (10) such that the conductive material facilitates electrical communication between the electrical interconnects (28) and the conductive traces. The electrical interconnects (28) may be formed so as to either provide electrical communication between a plurality of printed circuit boards (32, 34) or so as to define terminations for such printed circuits boards (32, 34).
Abstract:
A multilayer printed wiring board in which the strength is ensured by sandwiching a metal layer (18) between insulating layers (14, 20), thereby a core sheet (30) can be thin, and the thickness of the multilayer printed wiring board is reduced. Moreover, since a blind hole (22) extending to the metal layer (18) is formed only in insulating layers (14, 20), the fine blind hole (22) can easily be made by a laser beam, and a through hole (36) having a small diameter can be formed.
Abstract:
Described is a method of establishing a connection between at least one first electrical conductor forming a first joint partner (2) and a second conductor (4) mounted using laminating or etching techniques on a supporting substrate (3) and forming, together with the substrate, a second joint partner. The at least two joint partners (2, 3 and 4) are first brought into contact with each other by a tool (5) to which mechanical energy is supplied, and the substrate (3) is then melted in the vicinity of the tool (5) by also supplying heat. This causes the substrate to give way to the tool (5), and the at least two conductors (2, 4) are thus connected to each other by the tool (5).
Abstract:
The Combi-Film-Hybrid (CFH) technology combines multilayer thick-film and thin-film on the same substrate to build high-density interconnections with integrated resistors for multi-chip modules. The technology is based on two or more multi-layer thick-film conductor layers with printable thick-film dielectric layers between the conductors including via-holes and with one or more thin-film signal interconnection layers on top of the thick-film structure using thick-film or glass between the last printed thick-film conductor and the thin-film, and with polyimide dielectric between the thin-film layers. All dielectric layers include via-holes. Each thin-film layer consists of a resistive film, a diffusion barrier film and a conductive film photopatterned to include thin-film resistors. Transmission lines for critical signals are built of thin-film and by using the underlaying thick-film layer as reference plane and hereby making possible design of high-density interconnections with characteristics impedance matched to the integrated circuits being used, to the package itself and outside interconnection.
Abstract:
To adapt the frequency band of oscillating circuits with frequencies greater than the set frequency, made from a metal-plastic-metal sandwich foil useful as an identification label and manufactured from rolls (1) of sandwich foil connected to each other by at least one plastic film, the oscillating cicuits are conveyed almost continuously through two frequency-measuring cells (5, 6) between which is located a reduction unit (7). After comparison of the set value and actual value, the frequency band of an oscillating circuit is adapted by reduction of the capacitor part of the oscillating circuit by means of the reduction unit (7), which is controlled by the correction unit (8). The position of the reduction unit (7) determined by the correction unit is used as a base value by the reduction unit (7) during adjustment of a subsequent oscillating circuit, in such a way that only minor corrections are necessary for the final adjustment of the reduction unit (7) during reduction of the subsequent oscillating circuit. The process can be used if the choice of components and dimensions of the sandwich foil does not entail large differences in frequency between closely-spaced oscillating circuits.