Patent ID: 6469696
Filing Date: 2002-10-22
Classification: G06F

Abstract:
A position detector comprising:a member having a surface, a plurality of vertically and horizontally arranged antennas, and a spacer for providing a predetermined gap between the surface and the plurality of vertically and horizontally arranged antennas; a controller for sequentially driving the vertically arranged antennas in vertical positive and vertical negative directions, and for sequentially driving the horizontally arranged antennas in horizontal positive and horizontal negative directions so that the antennas sequentially radiate radio waves; a plurality of receivers for receiving the sequentially radiated radio waves on the surface of said member, each of said receivers including a filter for passing a predetermined frequency band, each filter having a different characteristic delay time; and a detector for detecting the position of said receivers on the surface of said member as an average position of a first position based on the received levels of the radio waves which are sequentially radiated in the vertical positive and vertical negative directions, and a second position based on the received levels of the radio waves which are sequentially radiated in the horizontal positive and horizontal negative directions so as to cancel the delay times of the filters and to eliminate different detection results for each of the receivers.