Encoder, motor with encoder, and servo system
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United States of America Patent
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Aug 23, 2016
Grant Date -
May 7, 2015
app pub date -
Oct 29, 2014
filing date -
Nov 5, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
An optical module includes: a light source configured to emit diffusion light to tracks; one light receiving array and another light receiving array which are arranged across the light source in a width direction substantially vertical to the measurement direction; a light receiving array arranged between the one light receiving array and the light source, and configured to receive light which is reflected at the tracks having a first incremental pattern; and a light receiving array arranged between the another first light receiving array and the light source, and configured to receive light which is reflected at the tracks having a second incremental pattern which pitch is longer than a pitch of the first incremental pattern.
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