Laminated piezoelectric keyboard

Details Laminated piezoelectric keyboard Laminated piezoelectric keyboard

1988-10-05

1989-08-15

Caldwell, Sr., John W.

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

200 5A, 200512, 310340, H01H 312

Patent

active

048578878

ABSTRACT:
The keyboard comprises piezoelectric crystal elements arranged between laminates provided with conducting strips. A voltage is generated when pressure is applied to the elements. The keyboard is tensionless in its rest state and contains no unwanted air spaces.

REFERENCES:
patent: 3339104 (1967-08-01), Kushner et al.
patent: 3464531 (1969-09-01), Herr et al.
patent: 3940637 (1976-02-01), Ohigashi et al.
patent: 4190785 (1980-02-01), Kompanek
patent: 4207443 (1980-06-01), Matsuura
patent: 4375018 (1983-02-01), Peterson
patent: 4431882 (1984-02-01), Frame
patent: 4618797 (1986-10-01), Cline
patent: 4680432 (1987-07-01), Sugiyama et al.
Randeraat, "Piezoelectric Ceramics", Mullard Limited, London, pp. 4-8, 47 and 52.

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