The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 04, 2008
Filed:
Oct. 30, 2003
Cornelis Van Berkel, Hove, GB;
Cornelis Van Berkel, Hove, GB;
Koninklijke Philips Electronics, N.V., Eindhoven, NL;
Abstract
An object sensing system (), and method, employing electric field sensing, also known as quasi-electrostatic sensing and which may be termed cross capacitive sensing, is described. The system () includes at least one electrode arrangement (), each electrode arrangement () includes one electric field sensing reception electrode () and two electric field sensing transmission electrodes (). One of the electric field sensing transmission electrodes () is driven with an alternating voltage () including at least some antiphase portions, for example an inverted signal, in comparison to an alternating voltage () with which the other electric field sensing transmission electrode () is driven. This improves the spatial precision of object sensing performed by detecting changes in the current induced in the electric field reception electrode (). In one arrangement the two electric field sensing transmission electrodes () are in the form of annular rings arranged around the electric field sensing reception electrode ().