Capacitive proximity switch

Details Capacitive proximity switch Capacitive proximity switch

2007-04-17

2007-04-17

Hirshfeld, Andrew H. (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C307S010100, C307S652000, C340S426280, C340S686600

Reexamination Certificate

active

10913498

ABSTRACT:
A capacitive proximity switch for detecting the change in the capacitance relative to a setpoint capacitance by the approach or retreat of an object in the sensitive area of a proximity switch, especially for use in the door handle of a motor vehicle, provides reliable error detection and error suppression at a fundamentally high sensitivity of the capacitive proximity switch by utilizing an evaluation unit that evaluates a measured value of the change in capacitance over time and depending on the time behavior of the measured value activates changes the operating threshold from a first threshold (which can be caused by a false object coming into or out of the sensitive area of the proximity switch) to a higher second threshold which can be reached only at a relatively greater change in capacitance caused by a target object coming into or out of the sensitive area of the proximity switch.

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patent: 2004/0046449 (2004-03-01), Eideheim et al.
patent: 2004/0125545 (2004-07-01), Kobayashi et al.

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