Data input device with a manually operable key having static ele

Details Data input device with a manually operable key having static ele Data input device with a manually operable key having static ele

1993-01-19

1995-03-28

Oberley, Alvin E.

Electricity: circuit makers and breakers

Electric switch details

Cases and bases

341 22, 361212, G09G 302, H05F 304

Patent

active

054019265

ABSTRACT:
A data input device, such as a keyboard, comprising at least one key having a static electricity releasing circuit incorporated therein. The key comprises a manually operable keytop for pushing the membrane switch and is made from an electrically conductive plastic. At least one coil spring is provided between the keytop and the support panel or the other conductive layer that is connected to a ground. Thus a static electricity releasing circuit is formed from the keytop to the ground via the coil spring so as to instantaneously and reliably release static electricity that has accumulated on an operator to a ground.

REFERENCES:
patent: 4586106 (1986-04-01), Frazier
patent: 4678880 (1987-07-01), Kazumi et al.
patent: 4814566 (1989-03-01), Sigt
patent: 5120923 (1992-06-01), Kato et al.
patent: 5130506 (1992-07-01), Zuercher et al.
patent: 5335137 (1994-08-01), English et al.
"Test Methods for Visual Display Units", MPR 1990:8 1990 Dec. 1.

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