Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1980-01-23
1983-04-05
Groody, James J.
Communications: electrical
Audible indication
Percussion-type sound producer
200 52R, 200DIG1, 361303, 361330, G06F 302, H01G 1005, H01G 101, H01G 1013
Patent
active
043792871
ABSTRACT:
A user, touch actuable switch panel of the capacitive type that includes one or more touch actuable capacitive switches, each switch including at least two capacitive plate elements formed on a dielectric panel. Conductive paths formed on the dielectric panel interconnect the capacitive plate elements to a source for applying signals to the capacitive plate elements forming said capacitive switches and sensing a resulting change in signal level when a selected switch is actuated by the user. Trim tabs formed on the dielectric panel are provided to balance the effect of stray capacitance between the conductive paths and the capacitive plate elements to maintain the level of change of signal at a determined value upon the actuation of each of said one or more capacitive switches.
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American Microsystems Inc., "Touch Control Circuits for Capacitance Switching".
Conway William H.
Tyler Hugh J.
Adams Harold W.
Groody James J.
Robertshaw Controls Company
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