Proximity sensor

Details Proximity sensor Proximity sensor

1995-06-29

1998-09-01

Kuntz, Curtis

Telegraphy

Systems

Position coordinate determination for writing

345174, 341 33, G08C 2100

Patent

active

058013407

ABSTRACT:
An improved capacitive sensor for detecting the presence of objects in a sensing region. The sensor is a multilayer structure with alternating layer of condutive and insulating materials. The sensor structure has three electrodes: a touch plate, a guard layer, a ground plane, each of which are separated from each other by insulating layers. The sensor is operated by detection electronic circuitry which function in a either a self excited mode or an externally excited mode. This sensor is capable of detecting objects in a sensing region several feet away from the sensing surface and is particularly suitable for automobile applications, such as detecting potentially jamming objects in power (auto-closing) windows, doors, and the like.

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