Device for determining position coordinates

Details Device for determining position coordinates Device for determining position coordinates

1991-03-13

1992-03-10

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

050951807

ABSTRACT:
In a cordless digitizer comprising a tablet, a cursor, and a signl processor, a power-supply grid structure (or structures) is provided in the tablet, and a power-supply frequency coupling coil is equipped in the cursor. The electric power to the cursor is supplied through electromagnetic coupling between the power-supply grid structure and the power-supply frequency coupling coil. The attribute of the point indicated by the cursor is conveyed by a binary code from the cursor to the signal processor.

REFERENCES:
patent: 4697059 (1987-09-01), Furukawa
patent: 4795858 (1989-01-01), Yamazaki
patent: 4878553 (1989-01-01), Yamazaki
patent: 4988837 (1991-01-01), Murakami et al.

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