Coordinate reading apparatus

Details Coordinate reading apparatus Coordinate reading apparatus

G - Physics

08

C

340/135.1

G08C 21/00 (2006.01) G06F 3/033 (2006.01)

Patent

CA 1192284

ABSTRACT OF THE DISCLOSURE A coordinate reading apparatus for reading positions on a tablet, having magnetic-field generating coils, with a magne- tic-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 in- duced by the magnetic-field generating coils. The analog elec- tric signal generated by the detector is composed of both a fun- damental 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 receives the analog electric signal from the magnetic-field detector and produces coordinate data corres- ponding to the desired position to be read on the tablet by analyzing a first rotating magnetic-field vector induced by the fundamental wave component signal and a second rotating magne- tic-field vector induced by the n-th order harmonic wave compo- nent signal. The phase component of the fundamental wave compo- nent signal and the phase component of the n-th order harmonic wave component signal are processed so that the coordinate data can be read by the processing unit. The apparatus of the pre- sent invention can detect coordinates at any position on a tab- let with a high degree of accuracy.

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