Rotation and displacement sensing apparatus

Details Rotation and displacement sensing apparatus Rotation and displacement sensing apparatus

1989-09-05

1990-12-04

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

340709, G08C 2100

Patent

active

049755463

ABSTRACT:
A position sensing apparatus that can be used with a compatible digitizing tablet to generate positional and rotational information. The apparatus contains two mutually perpendicular windings which are fed with AC waveforms on phase quadrature. The magnetic field generated by these windings is detected by the digitizing tablet. Alternatively, the perpendicular coils may be used to detect an externally generated magnetic field. A further winding can be added to give positional information. All windings can be arranged in a disclosed manner, and incorporated into a hand held system.

REFERENCES:
patent: 3876831 (1975-04-01), Wickham et al.
patent: 4289927 (1981-09-01), Rodgers

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