Coordinate reading apparatus

Details Coordinate reading apparatus Coordinate reading apparatus

1982-12-28

1984-09-11

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

33 1M, 178 18, G08C 2100

Patent

active

044711620

ABSTRACT:
A coordinate reading apparatus for reading positions on a tablet, having magnetic-field generating coils, with a magnetic-field detector. The magnetic-field detector produces an analog electric signal corresponding to a desired position to be read on the tablet in response to the magnetic fields induced by the magnetic-field generating coils. The analog electric signal generated by the detector is composed of both a fundamental wave component signal and an n-th order harmonic wave component signal (n being an integer equal to or larger than 2). A processing unit for receiving the analog electric signal from the magnetic-field detector and produces coordinate data corresponding to the desired position to beread on the tablet by analyzing a first rotating magnetic-field vector induced by the fundamental wave component signal and a second rotating magnetic-field vector induced by the n-th order harmonic wave component signal. The phase component of the fundamental wave component signal and the phase component of the n-th harmonic wave component signal are processed so that the coordinate data can be read by the processing unit.

REFERENCES:
patent: 3873770 (1975-03-01), Ioannou
patent: 4255617 (1981-03-01), Carau, Sr. et al.
Y. Takeda et al., "A New Data Tablet Superposed by a Plasma Display Panel," National Telecommunications Conference 1981, Nov. 29-Dec. 3, 1981, pp. G.5.4.1, Marriott Hotel, New Orleans, Louisiana.

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