Keyboard switch assembly having movable contact, and supporting

Details Keyboard switch assembly having movable contact, and supporting Keyboard switch assembly having movable contact, and supporting

1974-09-23

1976-07-06

Scott, James R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200 67DB, 200159B, 200275, 200292, H01H 1326, H01H 106

Patent

active

039683362

ABSTRACT:
A switching device having a movable contact element characterized by a set of unconnected, curved slots radiating outward from a central key area and equally spaced around the central key area. The radially extending unconnected, curved slots may be sections of a spiral, at least some of which sections overlap each other. Adjustment of the spring rate of the movable contact element is accomplished by adjusting the length of the slots or by regulating the distance of the inner terminus of the slots from a central point of the central key area. The movable contact element either contacts a second contact element for contact switching or approaches the second contact element for capacitive switching.
A plurality of the switching elements can be formed in a planar array on a continuous metallic substrate to provide a keyboard. The movable switching elements can be formed on the metallized areas of a printed circuit board.

REFERENCES:
patent: 3133170 (1964-05-01), Nanninga
patent: 3331040 (1967-07-01), Woodhead
patent: 3467923 (1969-09-01), Woodhead
patent: 3571542 (1971-03-01), Madden et al.
patent: 3594522 (1971-07-01), Colglazier et al.
patent: 3600528 (1971-08-01), Leposavic
patent: 3643041 (1972-02-01), Jackson
patent: 3697711 (1972-10-01), Tetrick
patent: 3742157 (1973-06-01), Leposavic
patent: 3800104 (1974-03-01), Lien et al.
patent: 3831118 (1974-08-01), Bitko
patent: 3842230 (1974-10-01), Kashio et al.
IBM Technical Disclosure Bulletin, H. L. Funk et al., "Keyboard Encoder," vol. 7, No. 11, Apr. 1965, pp. 1018, 1019.

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