Telegraphy – Systems – Position coordinate determination for writing
Patent
1985-12-26
1987-11-03
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
340712, 350331R, G08C 2100
Patent
active
047045019
ABSTRACT:
A position detecting device includes a tablet which has a magnetic sheet and two conductor sheets. The magnetic sheet is formed by weaving a group of warp elements (or weft elements) having multiple insulating fibers and a plurality of relatively long magnetic elements disposed among the fibers at predetermined regular spacings and a group of weft elements (or warp elements) having multiple insulating fibers into a plain weave fabric, which is hardened into a sheet-like configuration. Each of the conductor sheets has a plurality of linear conductor elements extending substantially parallel to each other. The two conductor sheets are respectively overlaid on the upper and lower sides of the magnetic sheet so that the conductor elements and the magnetic elements extend orthogonally with respect to each other. The corresponding conductor elements of the upper and lower conductor sheets are connected to from alternate exciting and detecting lines. The device further includes a driving current source for supplying the exciting lines with a cyclic alternating current designating, a position designating magnetic generator for generating a stationary magnetic field, and a position detecting for calculating, from the voltages respectively induced in the detecting lines, coordinate values of the position designated by the position magnetic generator.
REFERENCES:
patent: 4603945 (1986-08-01), Fergason
patent: 4609776 (1986-09-01), Murakami et al.
Taguchi Yoshinori
Yamanami Tsuguya
Schreyer Stafford D.
Wacom Co. Ltd.
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