Digitizer having flat tablet with magnetic shield plate

Details Digitizer having flat tablet with magnetic shield plate Digitizer having flat tablet with magnetic shield plate

1990-04-12

1992-07-14

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

051305003

ABSTRACT:
A digitizer for determining coordinate value of a point designated on a given two-dimensional coordinate plane. A pointing instrument is manually operable to designate a point on the given two-dimensional coordinate plane of a tablet. The tablet includes a flat sensor defining the given two-dimensional coordinate plane and operative for transmitting magnetic signal between the flat sensor and the pointing instrument disposed thereon to detect the designated point to thereby produce a detection signal, and a shielding plate disposed under the flat sensor to magnetically shield the flat sensor. The shielding plate is composed of silicon steel containing 4.0 to 7.0 weight % of silicon. A processing circuit is connected to the flat sensor for processing the detection signal to determine the coordinate value of the designated point.

REFERENCES:
patent: 3480728 (1969-11-01), Chandler
patent: 4497977 (1985-02-01), Saito et al.
patent: 4636582 (1987-01-01), Moriwaki et al.
patent: 4645869 (1987-02-01), Rockwell et al.
patent: 4848496 (1989-07-01), Murakami et al.
patent: 4853497 (1989-08-01), Landmeier

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