Membrane keyboard having key closure retention

Details Membrane keyboard having key closure retention Membrane keyboard having key closure retention

1983-03-31

1986-01-14

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Percussion-type sound producer

340365L, 400276, 4004792, G08C 900

Patent

active

045648328

ABSTRACT:
A membrane panel keyboard is presented having magnetic material in one contact element and magnetic field generating means to achieve self-retention or key closure retention when a key is actuated.

REFERENCES:
patent: 3588766 (1971-06-01), Baermann
patent: 3680026 (1972-07-01), Masuda
patent: 4028696 (1977-06-01), Madland
patent: 4420663 (1983-12-01), Larson
Bantz, et al., "Keyboard Device for Upper and Lower Case Keying Without Shifting," IBM Technical Disclosure, vol. 21, No. 9, Feb. 1979.
Fox, "Dual-Force Automatic Rekeying," IBM Technical Disclosure, vol. 17, No. 1, Jun. 1974.

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