Patent ID: 7277817
Filing Date: 2007-10-02
Classification: G01D,G06F

Abstract:
1. A position sensing device comprising: an insulating board; a first conductive sensing element positioned on the insulating board; a second conductive sensing element positioned on the insulating board and spaced from the first conductive sensing element; conductive material spaced from the first and second conductive sensing elements and operable to receive an oscillating signal to create an oscillating electric field between the conductive material and the first and second conductive sensing elements in a non-contacting manner; a differential amplifier having first and second differential inputs respectively connected to the first and second conductive sensing elements, a pointing object of a user disturbing the oscillating electric field being received by the first and second conductive sensing elements such that the signal levels at the first and second differential inputs vary according to the position of the pointing object relative to the first and second conductive sensing elements; a processor operable to generate a position signal based on an output of the differential amplifier.