Measuring device for determining extent and direction of relativ

Details Measuring device for determining extent and direction of relativ Measuring device for determining extent and direction of relativ

1986-12-01

1988-11-15

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356374, 356375, H01J 314

Patent

active

047851813

ABSTRACT:
A measuring device is disclosed which is capable of exhibiting increased resolution. The device is constructed to detect a moire fringe produced by two scales as A and B phase signals different in phase by 90.degree. and to convert each of the phase signals into a frequency-modulated signal by means of a carrier of a predetermined cycle to digitally read out the deviation of a phase varied with relative movement between both scales.

REFERENCES:
patent: 4472629 (1984-09-01), Ort
patent: 4580046 (1986-04-01), Sasaki et al.
patent: 4629886 (1986-12-01), Akyama et al.
patent: 4636079 (1987-01-01), Rieder et al.
patent: 4638421 (1987-01-01), Kimizuka et al.

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