Keyboard apparatus

Details Keyboard apparatus Keyboard apparatus

1985-12-11

1987-06-30

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

With time interval measuring means

367117, 367907, 340365R, G01S 380

Patent

active

046776001

ABSTRACT:
A keyboard apparatus has a plurality of elastically deformable elastic members disposed on a board in a predetermined positional relationship, a plurality of push members each disposed above each of said plurality of elastic members and adapted to push said elastic member to cause the same to elastically deform and produce an acoustic signal. At least three pickups are disposed on the board at different positions for sensing arrival of the acoustic signal. A detecting circuit determines for detecting the keyed position in response to the output from each of the pickups based upon the differences between arrival times of the acoustic signal at these pickups.

REFERENCES:
patent: 3647962 (1972-03-01), Whetstone
patent: 3857022 (1974-12-01), Rebane et al.
patent: 3976899 (1976-08-01), Fanshawe
patent: 4012588 (1977-03-01), Davis et al.
patent: 4031501 (1977-06-01), Caruso
patent: 4378552 (1983-03-01), Jalbert

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