Object sensing

Details Object sensing Object sensing

2008-03-04

2008-03-04

Nguyen, Vincent Q. (Department: 2858)

Electricity: measuring and testing

A material property using electrostatic phenomenon

C324S662000, C324S663000, C324S457000, C340S561000

Reexamination Certificate

active

07339381

ABSTRACT:
An object sensing system (50), and method, employing electric field sensing, also known as quasi-electrostatic sensing and which may be termed cross capacitive sensing, is described. The system (50) includes at least one electrode arrangement (30), each electrode arrangement (30) includes one electric field sensing reception electrode (32) and two electric field sensing transmission electrodes (34, 36). One of the electric field sensing transmission electrodes (36) is driven with an alternating voltage (130) including at least some antiphase portions, for example an inverted signal, in comparison to an alternating voltage (120) with which the other electric field sensing transmission electrode (34) is driven. This improves the spatial precision of object sensing performed by detecting changes in the current induced in the electric field reception electrode (32). In one arrangement the two electric field sensing transmission electrodes (34, 36) are in the form of annular rings arranged around the electric field sensing reception electrode (32).

REFERENCES:
patent: 5130829 (1992-07-01), Shannon
patent: 6025726 (2000-02-01), Gershenfeld et al.
patent: 2003/0021078 (2003-01-01), van Berkel
patent: 2004/0201384 (2004-10-01), Berkel
U.S. Appl. No. 10/153,261.

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