Rotary encoder measuring substantially coinciding phases of inte

Details Rotary encoder measuring substantially coinciding phases of inte Rotary encoder measuring substantially coinciding phases of inte

1996-10-02

1997-08-26

Allen, Stephone B.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023116, 250237G, 356356, G01B 922

Patent

active

056612966

ABSTRACT:
A rotary encoder has a disk with fine gratings comprising diffraction gratings of small diameters and a high density. Two diffraction lights of predetermined orders which are obtained when a light beam is irradiated to the fine gratings, are interfered properly with each other, thereby enabling rotational information of a rotary object to be detected at a high resolution while realizing a small and thin size of the overall apparatus.

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