Coordinate reader with pointer inclination compensation

Details Coordinate reader with pointer inclination compensation Coordinate reader with pointer inclination compensation

1990-12-04

1992-04-28

Williams, Howard L.

Coded data generation or conversion

Digital pattern reading type converter

For x or y coordinate determination

341 7, 178 18, H03M 122

Patent

active

051092255

ABSTRACT:
An electromagnetic induction type coordinate reader composed of a main peak signal group detecting circuit for detecting a group of main peak signals out of induced signals which include a maximum-amplitude main peak signal, are close to one another, and are of the same phase; first and second secondary peak detecting circuits for detecting first and second secondary peak signals present before and after the group of main peak signals which are opposite in phase to the maximum-amplitude main peak signal and are taking maximal values of the induced signals; a main peak signal group adding circuit for obtaining the sum of amplitude of the group of main peak signals; a secondary peak subtracting circuit for obtaining the difference between the first and second secondary peaks; an inclination information calculating circuit for dividing the difference of the secondary peaks by the sum of amplitude of the group of main peak signals to deliver the inclination information of a coordinate pointer; and an inclination correcting circuit for correcting a coordinate value in terms of inclination error on the basis of the inclination information.

REFERENCES:
patent: 4477877 (1984-10-01), Nakamura et al.
patent: 4577057 (1986-03-01), Blesser
patent: 4700022 (1987-10-01), Salvador et al.
patent: 4710595 (1987-12-01), Kimura
patent: 4717793 (1988-01-01), Kobayashi
patent: 4818851 (1989-04-01), Kimura
patent: 4939318 (1990-07-01), Watson et al.

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