Abstract:
In an electrical contact in which aggregation phases including Cu are dispersed in a matrix phase including Mo, Cr, and Cu, a maximum grain size of the aggregation phases falls in a range of 4 to 20 μm and, when the total Cu content in the electrical contact is denoted by Wt, the Cu content in the matrix phase is expressed by C×Wt, where C ranges from 0.54 to 0.81. A process for producing an electrical contact including Mo, Cr, and Cu includes a step of compacting mixed Mo and Cr powders, thus forming a powder-compression compact and a step of making the powder-compression compact infiltrated with molten Cu.
Abstract:
An electrical contact area on a printed circuit board (“PCB”), that would otherwise be subject to abrasion and possibly also corrosion, can be protected by covering it with another, more durable contact structure that is bonded to the first-mentioned contact area using an anistropic conductive adhesive (“ACA”). The more durable contact structure may include a member of PCB material or the like with electrically connected electrical contacts on its upper and lower surfaces. At least the upper one of these contacts (which is exposed for the service that involves possible abrasion and/or corrosion) may be given high durability by plating it with hard gold. The lower of these contacts is adhered to the main PCB via the above-mentioned ACA.
Abstract:
An electrical contact comprising a silver-coated stainless steel strip, which has an underlying layer comprising any one of nickel, cobalt, nickel alloys, and cobalt alloys, on at least a part of the surface of a stainless steel substrate, and has a silver or silver alloy layer formed as an upper layer, in which a copper or copper alloy layer with a thickness of 0.05 to 2.0 μm is provided between the silver or silver alloy layer and the underlying layer; and a producing method of the above-described electrical contact, in which the silver-coated stainless steel strip is subjected to a heat-treating in a non-oxidative atmosphere.
Abstract:
The present invention relates to a membrane switch which is not subject to stress relaxation at contacts and is resistant to the reduction in actuating force even if the ambient temperature of the switch becomes high. A first flexible insulating substrate having a first contact pattern and a second flexible insulating substrate having a second contact pattern are disposed in facing relation via a spacer member having an opening at an area in which the first contact patterns face each other; wiring patterns conductive-connected to corresponding contact patterns are provided on at least one of the first flexible insulating substrate and the second flexible insulating substrate; and the first and second contact patterns are conductive-connected by pressure applied to a contact comprising the first and second contact patterns. The wiring patterns are conductive layers containing resin made of a mixture of conductive powder and binder resin, and a part of the second contact pattern includes a layer containing resin that is more rigid than the binder resin.
Abstract:
Analog resistance touch switches and matrix type touch switches have contacts coated with a very thin film, which in use does not form an appreciable amount of an insulating oxide, to inhibit changes in contact resistance and extend operating life.
Abstract:
In a membrane switch having at least one silver conductive lead terminating at a termination point for connection to an electrical connector, the improvement comprising a strip of non-migrating, conductive material applied over said conductive lead at least in a region adjacent to said termination point and extending a distance beyond the termination point of said conductive lead for receipt of said electrical connector affixed to and in electrical contact with said strip of non-migrating, conductive material at the extended portion thereof.
Abstract:
A membrane switch assembly for mounting on a cathode ray tube is disclosed. The assembly is comprised of two layers of transparent film having spaced-apart parallel double hairline conductors deposited on the internal surfaces of both layers. The internal surfaces are separated by an insulating ultraviolet curable polymer spacer applied in parallel strips over the conductors, the spacer being discontinuous at the switch sites. The conductors cross and are normally spaced from each other at the switch sites so that when the switch is closed by applying force to bring the two layers of conductors together, the electrical circuit can be completed at any one of four locations. This ensures completion of the electrical circuit even if force has been applied at the outer edge of the switch site.
Abstract:
The subject matter of this invention relates to a membrane switch having a base sheet with a plurality of conductors on one surface of the sheet. A spacer sheet is adhesively secured to the base sheet on the surface having the plurality of conductors. The spacer sheet has a plurality of apertures, which apertures are aligned with selected portions of the conductors. A flexible cover sheet is adhesively secured to the spacer sheet. The flexible cover sheet has a second plurality of flexible conductors on its surface adjacent to the spacer sheet. The flexible conductors have selected portions aligned with respective apertures. Each of the flexible conductors has a thickness no greater than 0.0025 mil. The flexible cover sheet is positionable through a selected aperture with a portion of the flexible conductor to contact electrically the respective conductor on the base sheet aligned with that aperture.
Abstract:
An electronic desk-top calculator includes a bottom casing for the calculator on the inner surface of which bottom casing there are provided fixed contacts, and a flexible plate having thereon pairs of contacts provided with wiring conductors therefor. These pairs of contacts are so arranged at the positions in registry with the fixed contacts as to form a matrix. The fixed contacts act as bridging contacts and comprise electrically conductive material containing carbon particles. The pairs of contacts and wiring conductors have a first electrically conductive layer. An insulative layer of moisture-resistive material overlies the first conductive layer except those terminal ends of the wiring conductor which serve as contacts or electrical connectors. The exposed portions of the first conductive layer which function as switch contacts have an additional layer of electrically conductive material containing carbon particles.
Abstract:
Membrane switch assembly comprises a transparent laminate comprised of three sheets of cellulose acetate material. The intermediate sheet has an opening therein which defines a switch site. Hairline conductors on the internal surfaces of the outer sheets cross each other at the switch site so that the switch is closed when one of the outer sheets is pressed at the switch site. The conductors are produced on the surfaces of the outer sheets by a process including electroless deposition of blanket coatings of conductive metal, selective deposition along lines which define the conductors and selective etching of the blanket coating to leave the hairline conductors.