Piezoelectric switch with tactile response
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United States of America Patent
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-
Nov 9, 1999
Grant Date -
N/A
app pub date -
Mar 24, 1997
filing date -
Mar 24, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A piezoelectric keyswitch for providing tactile response comprises a bimorphic piezoelectric element anchored at its edge, and a keypad mounted on the bimorphic piezoelectric element spaced from the anchored edge so that depression of the keypad flexes the element to generate an electrical signal. A drive circuit responds to the electrical signal to provide a drive signal to bend the piezoelectric element to provide upward tactile feedback to the keypad.
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