Optical linear encoder with light quantity calabration
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United States of America Patent
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-
Nov 19, 1991
Grant Date -
N/A
app pub date -
Aug 28, 1990
filing date -
Aug 30, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an averaged diffraction moire position detector of the present invention, diffracted lights which have passed through the same places as those through which measuring diffracted lights have passed are used for monitoring a quantity of light. Therefore, change in the quantity of light of a light source and change in the transmittance of diffraction gratings can be suitably corrected.
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