TABLET INPUT DEVICE

摘要

PROBLEM TO BE SOLVED: To simplify a tablet input board and the driving circuit therefor. SOLUTION: This tablet input device is constituted of a tablet input board in which X electrodes Xa and Xb are vertically extended in the right and left periphery of the upper face of an insulating substrate, and a resistance film 23 is formed on one face between those X electrodes, and horizontally extended slits 22 are distributed on the resistance film, and also Y electrodes Ya and Yb are horizontally extended in the upper and lower periphery of the bottom face of the insulating substrate, and a resistance film 25 is formed on one face between those Y electrodes, a means for impressing a pulse to one of the X electrodes Xa and Xb in a prescribed time and impressing a pulse to one of the Y electrodes Ya and Yb in the other prescribed time, an input pen (pen type detection sensor) for detecting a voltage induced in an arbitrary point on the table input board 2 according to the impression of the pulse, a means for waveform shaping the output of the input pen, and A/D converting this, and an X and Y position calculating means for calculating the coordinate position of the input pen on the tablet input board from the output.