Telegraphy – Systems – Position coordinate determination for writing
Patent
1987-05-28
1988-12-27
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
G08C 2100
Patent
active
047942096
ABSTRACT:
An apparatus suitable for measuring coordinate positions of points in a wide range of coordinate read area on a plane. The apparatus includes a cursor, a cursor drive circuit for supplying an alternate current signal to the cursor, a coordinate read device for detecting an induced magnetic field generated by a current flowing through the cursor and for generating a plurality of induced voltages, a change-over circuit connected to the coordinate read device, an induced voltage detect circuit connected to the change-over circuit for detecting a peak voltage of the plurality of induced voltages generated by the coordinate read device, a coordinate position detect circuit for effecting a calculation of a position of the cursor from the plurality of the peak voltages detected, and a control circuit for controlling the cursor drive circuit, the change-over circuit, the induced voltage detect circuit, and the coordinate detect circuit. The coordinate detect circuit has at least two grid structures including a grid structure for detecting a small region where the cursor exists and a grid structure for detecting a large region where the cursor exists. The former is provided with four fine position sense lines, whereas the latter has a plurality of coarse position sense lines. The position of the cursor is calculated from a plurality of induced voltages appearing in the plurality of fine position sense lines and a plurality of induced voltages developed in the plurality of coarse position sense lines.
REFERENCES:
patent: 4029899 (1977-06-01), Gordon
Asada Akihiro
Idei Hideaki
Hitachi , Ltd.
Schreyer Stafford D.
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