Key for producing pitch variation and tone alternation in a...

Details Key for producing pitch variation and tone alternation in a... Key for producing pitch variation and tone alternation in a...

G - Physics

10

H

84/1.7

G10H 1/00 (2006.01)

Patent

CA 1229752

ABSTRACT The specification describes a key for a keyboard- operated tone producing apparatus which has in combination a downwardly depressable key and a pressure-sensing capacitor providing a signal proportional to the depression of the key. The capacitor has an electrically conductive leaf spring electrode connected to the downwardly depressable key and is movable by key depression through a predetermined path. A resiliently deformable electrode is positioned in the path and shaped so as to vary the capacitance between the electrodes in response to deformation thereof. A dielectric layer is interposed between the electrodes.

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