Encoder having a scale with two areas in which an increasing direction of the amplitude of the energy distribution is opposite between the two areas for precisely obtaining a position of the scale
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United States of America Patent
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Sep 1, 2015
Grant Date -
Oct 18, 2012
app pub date -
Apr 12, 2012
filing date -
Apr 14, 2011
priority date (Note) -
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Abstract
An encoder includes a scale that includes a pattern row, a detector array, and a signal processor. The pattern row has a plurality of different modulation periods in the moving direction, an amplitude of the energy distribution in the pattern having at least one modulation period being configured to change with a position of the scale in the moving direction. The signal processor acquirers an amplitude of an energy distribution of a corresponding modulation period based on an output signal from the detector array, and an amplitude signal obtained by normalizing a plurality of amplitudes obtained by the plurality of amplitude acquirers, the amplitude signal serving as a position signal representative of the position of the scale.
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