Coordinate input device

Details Coordinate input device Coordinate input device

1986-06-02

1987-12-15

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

047134968

ABSTRACT:
A coordinate input device is disclosed according to the invention, there is provided a plurality of conductors embedded in parallel on an input plane, scanning signals are supplied sequentially in such a manner of applying concurrently signals of the same phase to at least two of the conductors, then with special attention to the scanning position discriminated where the polarity of a scanning signal detected with a coordinate indicator is discriminated to have inverted, the levels of the signals before and after the inversion of their polarity are detected so as to determine where the coordinate indicator is positioned between the conductors.

REFERENCES:
patent: 4213005 (1980-07-01), Cameron

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