Vernier index position sensor
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United States of America Patent
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-
Jan 5, 1999
Grant Date -
N/A
app pub date -
Oct 2, 1997
filing date -
Oct 2, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An index structure and method are disclosed which employ, in addition to a main diffractive grating track of an encoder, a short diffractive grating track (the vernier or index track) having a different frequency than that of the main track. The phase of the index track is used to provide windows for the main track in a manner so that a preselected phase condition of the main track occurs in only one of the windows provided by the index track.
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