Tablet input device

Details Tablet input device Tablet input device

1992-05-28

1993-11-30

Kuntz, Curtis

Telegraphy

Systems

Position coordinate determination for writing

178 18, 345174, G08C 2100

Patent

active

052667502

ABSTRACT:
It is so constructed that the current flowing during the input waiting period is reduced. A pull-down resistor is connected to one electrode of X-axis electrodes. A diode is connected to one electrode of Y-axis electrodes along the Y-axis electrode direction. During the input waiting period, the anode terminal of the diode is set to a high level. The detection of the voltage variation of the X-axis electrode to which the resistor is connected is performed during the input waiting period. When the voltage variation is detected, the operation of detecting a position is started.

REFERENCES:
patent: 4570149 (1986-02-01), Thornburg et al.
patent: 4575580 (1986-03-01), Jandrell
patent: 4672358 (1987-06-01), Beches et al.

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