DETERMINATION APPARATUS OF COORDINATES

摘要

PURPOSE: To decide the position of a point characterized by impedance discontinuity in the line, which is generated as a result that a finger tip or a conductive segment touches a line and which is. CONSTITUTION: A device having one signal conductor 14 provided with a first terminal 22 and a second terminal 26 is provided. The signal conductor is constituted so that impedance can be changed in a space place following the conductor. The signal conductor is supported by a substrate 12. A signal generator 24 generating a measurement signal by following the signal conductor is connected to the first terminal 22 of the signal conductor. The measurement signal has a prescribed characteristic for plural time intervals when it is nor interrupted. When interruption is generated in the measurement signal by touching the signal conductor 14 by the finger tip, the characteristic of the measurement signal changes from prescribed deviation. Since a processing circuit 40 is functionally connected to the first terminal of the signal conductor, a time interval when the measurement signal is interrupted can be decided. The processing circuit contains a correlation circuit and the correlation circuit causes the time interval to correspond to one detached place.