Angular information input system

Details Angular information input system Angular information input system

1995-04-13

1998-05-12

Williams, Howard L.

Coded data generation or conversion

Digital pattern reading type converter

For x or y coordinate determination

345173, 178 18, H01H 1900

Patent

active

057512299

ABSTRACT:
An angular information input system detects the inclined angle of a pointing device with a high accuracy without possible errors. This system is constituted so as to detect the induction voltage distribution in each axial direction generated by sensing coils (Ci) arranged under a display screen (16) by electromagnetic wave from a tuning circuit (34) contained in a pointing device (34). This system includes calculating means for calculating normalized values vpax, vpbx, vpay, and vpby in each axial direction by using a ratio between main peak voltage (Vp) representing the pointed coordinate by the pointing device (34) and auxiliary peak voltages (Vpa, Vpb). These normalized values are function parameters for calculating the inclined angles (.multidot..theta.x, .theta.y) in respective axial directions to input data representing the inclined angle .theta. and inclined direction of the pointing device into the associated computer.

REFERENCES:
patent: 4477877 (1984-10-01), Nakamura et al.
patent: 4939318 (1990-07-01), Watson
patent: 5109225 (1992-04-01), Morita
patent: 5198623 (1993-03-01), Landmeier

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