Absolute encoder, signal processing method, program, driving apparatus, and industrial machine
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United States of America Patent
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Aug 16, 2016
Grant Date -
Jun 4, 2015
app pub date -
Nov 26, 2014
filing date -
Nov 29, 2013
priority date (Note) -
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Abstract
An absolute encoder includes a scale with a plurality of marks of various types arranged with a space and a period. A detector includes a plurality of elements arranged along a direction corresponding to the aforementioned arrangement, and detects a partial plurality of marks. A signal processor performs amplitude quantization with respect to each period of periodic signals with a plurality of periods output from the detector to generate a data string. First position data having a resolution of the period is generated. The signal processor obtains a plurality of thresholds for the quantization respectively corresponding to a plurality of periodic signals of the periodic signals with the plurality of periods based on a plurality of representative values respectively obtained from the periodic signals with the plurality of periods.
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