Keyboard switch apparatus for electronic musical instrument

Details Keyboard switch apparatus for electronic musical instrument Keyboard switch apparatus for electronic musical instrument

1985-11-21

1988-03-29

Witkowski, Stanley J.

Music

Instruments

84DIG7, 200 5A, G10H 134

Patent

active

047335904

ABSTRACT:
A keyboard switch apparatus for an electronic musical instrument has first, second and third layers, and first and second switches. The second layer has elasticity and is separated from the first layer. The third layer has elasticity and is inserted between the first and second layers at a distance therefrom. The first switch consists of conductors respectively formed on opposite surfaces of the second and third layers. The second switch consists of conductors respectively formed on opposite surfaces of the first and third layers. The second and third layers are sequentially urged and deformed by an actuator interlocked with key depression. The first and second switches are sequentially closed. A time requred for closing the first switch is different from that for closing the second switch. The closure time difference corresponds to a key depression speed, which is used to generate a signal corresponding to the depression speed, and a musical tone signal corresponding to the depression speed.

REFERENCES:
patent: 3965789 (1976-06-01), Pearlman
patent: 3995126 (1976-11-01), Larson
patent: 4052581 (1977-10-01), Matsui
patent: 4160400 (1979-07-01), Schrecongost
patent: 4268815 (1981-05-01), Evantoff et al.
patent: 4506581 (1985-03-01), Sunada
patent: 4615252 (1986-10-01), Yamauchi et al.
patent: 4628785 (1986-12-01), Buchla
patent: 4628786 (1986-12-01), Buchla
patent: 4668843 (1987-05-01), Watanabe et al.

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