Coordinate input apparatus including a detection circuit to dete

Details Coordinate input apparatus including a detection circuit to dete Coordinate input apparatus including a detection circuit to dete

1987-08-25

1989-04-04

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

048188263

ABSTRACT:
A coordinate input apparatus includes proximity detecting means for a coordinate pointing tool on an input plane, wherein detection of the coordinates indicated by the pointing tool is performed when the absolute value of the signal level detected by the coordinate pointing tool twice exceeds a predetermined output level during a single scanning operation. When the coordinate pointing tool is dropped or laid on the input plane, the output signal level does not twice exceed the predetermined level within one scanning operation, and consequently, no coordinate detecting operation will be performed.

REFERENCES:
patent: 4717793 (1988-01-01), Kobayashi

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