Encoder, apparatus including the encoder, encoder calculation method and storage medium storing encoder calculation program
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United States of America Patent
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Oct 25, 2016
Grant Date -
Jul 16, 2015
app pub date -
Nov 25, 2014
filing date -
Jan 10, 2014
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Abstract
The encoder includes a scale provided with multiple periodic patterns having mutually different periods, a sensor outputting, with a relative movement between the scale and the sensor, multiple periodic signals periodically changing respectively corresponding to the periods of the periodic patterns, and a signal processor calculating a detected movement amount as a detected relative movement amount between the scale and the sensor. The signal processor calculates, by using each of the periodic signals, an accumulated movement amount which is an accumulated value of the relative movement amount between the scale and the sensor in units of one over an integer of the period of the periodic pattern corresponding to the periodic signal used, unifies the units of the accumulated movement amounts calculated by using the respective periodic signals, and calculates the detected movement amount from the accumulated movement amounts with the unified units.
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