Position detecting apparatus
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United States of America Patent
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-
May 30, 2000
Grant Date -
N/A
app pub date -
Oct 28, 1997
filing date -
Oct 28, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A displacement detecting apparatus includes a scale having a graduation of predetermined pitches, a sensor which is displaceable with respect to the scale and detects a period signal corresponding to the pitch. Interpolating sections interpolate the periodic signal from the sensor by different resolutions. One of the interpolating sections outputs a first interpolation signal of m (positive integer) phases shifted by a phase difference .theta.1, and the other interpolating sections outputs a second interpolation signal of n (positive integer) phases shifted by a phase difference .theta.2.
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