Patent ID: 6798403
Filing Date: 2004-09-28
Classification: G06F

Abstract:
A coordinates detection system for detecting coordinates of an object movable to fixed detection means, said system comprising the fixed detection means, signal wave transmitter means and coordinates detection means, wherein:said signal wave transmitter means is provided at said movable object and generates to transmit signals of electromagnetic wave and ultrasonic wave to said fixed detection means; said fixed detection means comprises first and second detection means, said first detection means receiving and detecting a signal of electromagnetic wave transmitted from said transmitter means, and said second detection means detecting a signal of ultrasonic wave transmitted directly from said transmitter means; said coordinates detection means detecting coordinates of a position of said movable object provided with said transmitter means by detecting a time difference between the detection of the transmitted waves of said first and said second detection means; said second detection means defining an opening, the size of the opening being smaller than a detection element cone section of the second detection means, for passing therethrough to further transmit the transmitted signal of ultrasonic wave to said cone section by making the transmitted ultrasonic wave propagate radially from a center of opening to said cone section.