Coordinate position digitizing system

Details Coordinate position digitizing system Coordinate position digitizing system

G - Physics

08

C

340/135.1

G08C 21/00 (2006.01) G01B 7/004 (2006.01)

Patent

CA 1214840

COORDINATE POSITION DIGITIZING SYSTEM ABSTRACT OF THE DISCLOSURE A coordinate position digitizing system comprises a position determining plate having a plurality of first parallel stripped electrodes provided on one surface of a insulating layer to form plural groups thereof each connected in common and a plurality of second parallel electrodes each having the width wider than that of each of the first electrodes and provided on the other surface of the insulating layer to extend in the direction perpendicular to the first electrods, a detecting electrode provided to face to the surface of the insulating layer on which the first electrodes are provided and connected through a predetermined capacitance to a reference potential point for producing a signal in response to a voltage obtained thereat, driving and controlling means for supplying with a constant voltage selectively to the groups of the first electrodes one after another during a first period and also supplying with the constant voltage selectively to the second electrodes one after another during a second period, and means for producing positional data defining positions of the detecting electrode on the position determining plate in both the direction of arrangement of the first electrodes and the direction of arrangement of the second electrodes in response to the signal derived from the detecting electrode.

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