Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2005-02-22
2005-02-22
Lee, Benjamin C. (Department: 2632)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S686600, C324S658000, C324S663000, C324S688000, C341S033000
Reexamination Certificate
active
06859141
ABSTRACT:
An electric field proximity detector capable of detecting partially conductive or conductive objects regardless of their impedance to circuit ground. The detector has a sensor with a transmitting electrode, a receiving electrode, and at least one circuit ground electrode preferably arranged in a bulls-eye configuration with the ground electrode between the transmitter and receiver electrodes. With appropriate sizing, upon the approach of an object, a signal received by the receiving electrode decreases, at least until the object is within a threshold distance of the sensor. The size and positioning of the ground electrode further reduces the effects of stray capacitance.
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Clayton Diane J.
Van Schyndel Andre J.
Lee Benjamin C.
Nortel Networks Limited
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