Coordinate detecting apparatus

G - Physics – 08 – C

Patent

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Details

340/135.1

G08C 21/00 (2006.01) G06F 3/033 (2006.01)

Patent

CA 1251537

ABSTRACT A coordinate detecting apparatus allowing to input the coordinate data of a point on a plane by indicating the point with a touch of a fingertip to the point is dis- closed. The apparatus comprises a transparent resistive film constituting the plane (touch panel) and a buffer circuit operating as a voltage follower circuit having substantially infinite input impedance. The buffer amplifier is operatively connected between each selected pair of facing ends of the substantially rectangular region of the resistive film, and equalizes the potentials at the ends. The change of the impedance between one of the ends and the ground is detected in accordance with the touch of the fingertip to the touch panel and used as an original coordinate data. Further modifications concerning the avoiding of degradation in the detection quality due to the fluctuations of the impedance provided by the touch of a fingertip, for example, and the methods to perform 2-dimen- sional coordinate detection are described.

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