Photoelectric absolute encoder having a light receiving element array additionally arranged corresponding to a boundary between the track having a wide pitch pattern and a narrow pitch pattern and installation method therefor
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United States of America Patent
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Sep 1, 2015
Grant Date -
Jun 5, 2014
app pub date -
Dec 2, 2013
filing date -
Dec 4, 2012
priority date (Note) -
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Abstract
In a photoelectric absolute encoder including a scale having a plurality of tracks with different pitch patterns, and a detector having a light source and light receiving elements including a plurality of light receiving element arrays corresponding to the plurality of tracks, a light receiving element array is additionally arranged at a position in the detector corresponding to a boundary between the track having a pattern with a wide pitch and the track having a pattern with a narrow pitch adjacent to each other in the scale, and displacement of the detector relative to the scale in a lateral direction is detected from a signal amplitude of the added light receiving element array. In this manner, displacement of the detector relative to the scale in the lateral direction can be detected.
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