Electricity: circuit makers and breakers – Capacitive switch
Reexamination Certificate
2007-04-24
2007-04-24
Lee, Richard K. (Department: 2832)
Electricity: circuit makers and breakers
Capacitive switch
C200S510000, C250S221000, C345S173000
Reexamination Certificate
active
11084789
ABSTRACT:
A capacitance based switch device employs an electric field imaging device electrically coupled via an electrical conductor to a conductive electrode member that is attached to the door or any other suitable surface. Such electric field imaging device generates a sine wave which is transmitted to the conductive electrode member and produces a surrounding electrical field. Any human body part which enters such electrical field will create a capacitance load due to the body being grounded to a surface. Reduction in distance between the body part and the conductive electrode will increase the capacitance and will decrease the voltage intermediate the resistor and conductive electrode which is an inverse function of the capacitance. Such change in voltage will be detected by a microcontroller by comparing voltages at each end of the resistor and the change exceeding a predetermined threshold will be associated with an output control signal.
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Motorola, Analog Product, MC33794 Fact Sheet, 33794 Electric Field Imaging Device, (2 pp.), © 2002 Motorola, Inc., MC33794FS/D Rev. 1.
Citta James W.
Urman Robert
Lee Richard K.
The Webb Law Firm
Wabtec Holding Corp.
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