Electricity: circuit makers and breakers – Multiple circuit control – Multiple switch
Patent
1988-06-20
1989-06-06
Scott, J. R.
Electricity: circuit makers and breakers
Multiple circuit control
Multiple switch
200292, 200512, 361398, H01H 900, H01H 1370, H05K 100
Patent
active
048374121
ABSTRACT:
A keyboard of a membrane contact type comprises a membrane contact unit having movable contacts, fixed contacts disposed respectively opposite to the movable contacts, and a printed wiring board having electronic circuit elements and provided with printed wiring lines. The membrane contact unit comprises a flexible, insulating, membranous substrate having movable contacts formed in a movable contact section and fixed contacts formed in a fixed contact section demarcated by a folding line, in the same surface as the movable contacts and arranged symmetrically about the folding line. First and second wiring lines connect the movable contacts and the fixed contacts respectively in a predetermined connecting pattern. A first terminal section having first terminals is connected respectively to the first wiring lines, and a second terminal section having second terminals is connected respectively to the second wiring lines. The first and second terminal sections are formed near the folding line. U-shaped slits are formed in the substrate so as to embrace the extremities of the first and second terminal sections, respectively, so that the first and second terminal sections project from the folded edge of the membranous substrate when the same is folded along the folding line to facilitate electrically and mechanically connecting the membrane contact unit to the printed wiring board.
REFERENCES:
patent: 4246452 (1981-01-01), Chandler
patent: 4356358 (1982-10-01), Fukukura
patent: 4425484 (1984-01-01), Fukukura
patent: 4484039 (1984-11-01), Salie
patent: 4623768 (1986-11-01), Gnant
OKI Electric Industry Co., Ltd.
Scott J. R.
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