Electrical capacitance proximity sensor

Details Electrical capacitance proximity sensor Electrical capacitance proximity sensor

2006-10-10

2006-10-10

Nguyen, Vincent Q. (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S688000

Reexamination Certificate

active

07119554

ABSTRACT:
An electrical capacitance proximity sensor for detecting a nearby object takes a normal operation mode for detecting the nearby object approaching and a self-diagnostic mode for detecting a correct connection between a sensor section and a detecting circuit section. The detecting circuit section is provided with a buffer controller which supplies a second oscillation signal having the same phase and voltage as a first oscillation signal applied to a guard electrode in the normal operation mode, and stops supplying the second oscillation signal in the self-diagnostic mode. A control circuit determines whether the sensor section is correctly connected to the detecting circuit section base on the change in the detecting signal in the normal operation mode and the self-diagnostic mode.

REFERENCES:
patent: 5757196 (1998-05-01), Wetzel
patent: 2003/0080755 (2003-05-01), Kobayashi
patent: H07-029467 (1995-01-01), None

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