Music – Instruments
Patent
1984-02-06
1986-04-08
Witkowski, Stanley J.
Music
Instruments
84 127, 84DIG7, G10H 134
Patent
active
045804788
ABSTRACT:
There is disclosed a key which is particularly adapted for use in a musical keyboard. The key includes a top pivotable member which acts as a key surface and which is pivoted to move with respect to a reference plane. The key contains on a bottom surface a magnetic field effecting member. Located beneath the key on the reference plane is a rigid board containing a planar coil configuration. As the hinge member is moved towards the rigid board, the member affects the magnetic field of the planar coil configuration to vary the inductance as well as the magnetic coupling in other arrangements. A plurality of such keys are employed as the keys in a musical keyboard and are associated with frequency determining circuits such as oscillators to provide output frequencies necessary for the control of music. The planar coil configuration, in conjunction with the member of the movable board, operates as a position sensor to enable a manufacturer to provide many functions necessary for operation in an electronic musical instrument.
REFERENCES:
patent: 3580979 (1971-05-01), Amano
patent: 3634594 (1972-01-01), Hiyama
patent: 4273017 (1981-06-01), Dodds et al.
patent: 4299153 (1981-11-01), Hoskinson et al.
patent: 4357850 (1982-11-01), Franz et al.
patent: 4425511 (1984-01-01), Brosh
Brosh Amnon
Fiori, Jr. David
Bitronics Inc.
Plevy Arthur L.
Witkowski Stanley J.
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