Tablet device for use with an electronic input coordinate system

Details Tablet device for use with an electronic input coordinate system Tablet device for use with an electronic input coordinate system

1997-03-10

1999-11-02

Shankar, Vijay

Telegraphy

Systems

Position coordinate determination for writing

178 1803, G08C 2100

Patent

active

059774916

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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