Coordinate input system using a tablet

Details Coordinate input system using a tablet Coordinate input system using a tablet

1999-05-17

2000-11-14

Shankar, Vijay

Telegraphy

Systems

Position coordinate determination for writing

178 1801, 345174, G08C 2100, G09G 500

Patent

active

061473138

ABSTRACT:
A coordinate input system using an electronic tablet with four electrodes and four lines connected to the four electrodes. The four lines diverge into eight lines, and the eight lines are connected to a connector. Four of the eight lines reflect the electrical potential on the four electrodes. These four lines are connected to an A/D converter. The remaining four lines supply a voltage to the four electrodes. This coordinate system detects initial electrical potential values with hardware.

REFERENCES:
patent: 4794634 (1988-12-01), Torihata et al.
patent: 5072076 (1991-12-01), Camp, Jr.
patent: 5159159 (1992-10-01), Asher
patent: 5335230 (1994-08-01), Crooks et al.

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