Position detecting apparatus

Details Position detecting apparatus Position detecting apparatus

1997-10-28

2000-05-30

Shah, Kamini

Data processing: measuring, calibrating, or testing

Measurement system

Dimensional determination

73657, 73659, G01H 1700

Patent

active

060701323

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.

REFERENCES:
patent: 5734108 (1998-03-01), Walker

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