Patent ID: 6784876
Filing Date: 2004-08-31
Classification: G06F

Abstract:
A coordinate reading device reading a coordinate of a position of a target which generates an alternating magnetic field, the coordinate reading device comprising:a base member having a front surface, a rear surface, a pair of opposite side surfaces, each of which connects the front surface and the rear surface, a pair of opposite edges being defined between the front surface and the pair of side surfaces; a plurality of loop wires provided on the base member, each loop wire being capable of producing an electric signal in response to an alternating magnetic field generated from a target which is located in front of the front surface, each loop wire having at least one edge portion, each loop wire being provided on the front surface of the base member, and having a pair of first sides that extend on the front surface in a direction substantially perpendicular to the pair of opposite edges and at least one second side that extends in another direction substantially parallel with the pair of opposite edges to connect the pair of first sides therebetween, the at least one second side defining the at least one edge portion, each of the at least one second side being located on either one of a corresponding side surface and the rear surface, with the first side being bent at a corresponding edge of the base member in a direction toward the rear surface with a bending amount that separates the second side away from the corresponding edge by a distance that is equal to the bending amount, thereby causing each loop wire to produce a corrected signal when the target is located in the corresponding edge portion of the loop wire; and a detection unit that detects levels of the signals generated from the plurality of loop wires, thereby determining a coordinate of the position of the target.