Showing papers on "Flexible electronics published in 1982"

Piezo-electric push button switch

Abstract: In a piezo-electric push button switch, a flexible printed circuit board is secured to terminals which are embedded in the housing, and the piezo-electric plate is supported by the flexible printed circuit board in such a manner that it is floated from the housing, whereby external impact or vibration is decreased, and in which an integrated circuit consisting of a resistor and a capacitor is incorporated in the switch body, to eliminate harmonics.

Semiconductor module circuit interconnection system

Abstract: This circuit system accommodates the interconnection of a plurality of modules, each containing a plurality of semiconductor chips, by means of a flexible printed circuit wiring assembly containing contact pads and an interconnection wiring pattern. The modules contain a set of contact pads corresponding to the pads on the flexible wiring assembly and alignment pins to bring the abutting pads into registration. The pads on the flexible wiring assembly have a plurality of contact bumps to make better contact with the module packs. Clamping means is provided to retain the module and exert pressure on the contact pads.

Permanently connecting a set of conductive tracks on a substrate with a co-operating set on a printed circuit

Abstract: A flexible printed circuit is secured with adhesive to a glass or plastics substrate. Electrical connection between the tracks of the printed circuit and co-operating tracks on the substrate is made by way of conductive fibers with which the adhesive is loaded in such a proportion that no bridging electrical contact is established between laterally adjacent tracks.

Flexible PCB assembly with rigid PCB - uses guided slots with aligned tracks which are joined by solder fillets

Abstract: The section of flexible printed circuit sheet is mated with the fixed, rigid, receiving circuit board by straight-sided strips which fit into slots on the rigid board. Tracks from the circuit on the flexible sheet end in widened parallel tracks on the two strips. A gap separates the ends of the tracks. The circuit connections to be made on the rigid board terminate at conducting pads adjacent to the edges of the slots. The flexible sheet is folded over along the line defining the gap in the track ends and the folded strips are inserted into the slots. Folded back edges in the flexible sheet form stops to define the correct inserted position. Once in position, the aligned adjacent conducting strips are soldered across with solder fillets on the under-side of each half. Since the force tending to pull the flexible board out of the slots acts at right angles to the rigid board, the solder joints are forced onto the tracks which ensures a stable mechanical, as well as electrical connection.