Device having multiple conductive contact switches
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United States of America Patent
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N/A
Issued Date -
Jan 25, 2007
app pub date -
Jul 20, 2005
filing date -
Jul 20, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A device such as a handheld calculator, mobile telephone or remote control unit having a number of input keys. Each key has an electrically conductive exposed surface to be touched by a user. The device includes a discrete oscillator circuit in each key generating an AC voltage. Capacitance of the key changes when touched by a user, changing the AC voltage. A switch circuit responds to the AC voltage change.
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