Encoder, servomotor, and motor unit
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United States of America Patent
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Sep 1, 2015
Grant Date -
Jul 4, 2013
app pub date -
Feb 27, 2013
filing date -
Sep 2, 2010
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Abstract
This disclosure discloses an encoder. The encoder includes a disk including a first and a second track. A first and a second rotating grating are formed in the first and second tracks, respectively. A first and a second detector are disposed so as to face the first and second tracks, and have a first fixed grating constructing a first diffraction interference optical system together with the first rotating grating and a second fixed grating constructing a second diffraction interference optical system together with the second rotating grating, respectively, and configured to detect a first and a second detection signal, respectively, from the first and second diffraction interference optical systems. At least one of the first and second rotating gratings is formed by a plurality of curved slits in a curved shape.
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