Absolute encoder using multiphase analog signals

Details Absolute encoder using multiphase analog signals Absolute encoder using multiphase analog signals

1991-06-06

1996-04-09

Williams, Howard L.

Coded data generation or conversion

Digital pattern reading type converter

Incremental

341 13, 25023118, H03M 130

Patent

active

055065791

ABSTRACT:
The absolute encoder utilizes two or more sensors per track and the output of each sensor is modulated by the track to generate a multiphase analog signal from each track. An analog to digital converter converts each analog signal to a digital value. The multiphase cyclic digital values are combined into a single linear output per track that increases linearly from zero to a maximum over the full span of the measuring scale. Corrections are made for zero drift in the analog signals, for changes in amplitude (gain) of the analog signals and for deviations in the linear values from a perfect straight line. When measuring rotary displacement the methods disclosed may be used to combine the outputs of the geared scales.

REFERENCES:
patent: 4524347 (1985-06-01), Rogers
patent: 5012238 (1991-04-01), Hayashi et al.
patent: 5041829 (1991-08-01), Garrett
patent: 5121116 (1992-06-01), Taniguchi
patent: 5126736 (1992-06-01), Okutani
patent: 5173693 (1992-12-01), Fry

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