Movable contact unit having press-down projections

Details Movable contact unit having press-down projections Movable contact unit having press-down projections

2005-06-14

2005-06-14

Scott, James R. (Department: 2832)

Electricity: circuit makers and breakers

Solid contact

Membrane type

C200S341000, C200S345000

Reexamination Certificate

active

06906274

ABSTRACT:
Movable contact unit of the present invention comprises a plurality of dome-like movable contacts made of electrically conductive metal sheets capable of making an inflective action when depressed, a base film having an adhesive layer for retaining upper surfaces of the plurality of movable contacts, and a plurality of press-down projections bonded by adhesive to an upper surface of the base film in positions corresponding to center portions of the respective movable contacts, wherein the upper surface of the base film and underside surfaces of the press-down projections are each provided with a pretreated layer. The above structure has an advantage of strengthening the bonding between the adhesive and each of the pretreated layers formed on the adhering surfaces of the base film and the press-down projections, so as to provide the movable contact unit with outstanding reliability in maintaining the bonded condition for a long duration.

REFERENCES:
patent: 5888656 (1999-03-01), Suzuki et al.
patent: 6084190 (2000-07-01), Kenmochi
patent: 6224278 (2001-05-01), Nishi
patent: 6604278 (2003-08-01), Sera et al.
patent: 6723936 (2004-04-01), Ootsuka et al.
patent: 2002-216582 (2002-08-01), None

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