Rotary encoder using multiple diffracted beams having co-inciden

Details Rotary encoder using multiple diffracted beams having co-inciden Rotary encoder using multiple diffracted beams having co-inciden

1990-03-14

1990-12-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

049755706

ABSTRACT:
A rotary encoder for detecting a rotation status of a rotary scale having a diffraction grating formed along a rotational direction comprises a directing device for directing a radiation beam to a first position on the rotary scale and directing a plurality of diffracted beams generated at the first position to a second position different from the first position. The direction device is constructed such that the plurality of diffracted beams gave a common light path between the first position and the second position. The encoder also includes a forming device for forming an interference beam from a plurality of rediffracted beams generated at the second position, and a convertor for converting the interference beam to a signal to produce the signal representing the rotation status.

REFERENCES:
patent: 3756723 (1973-09-01), Hock
patent: 4676645 (1987-06-01), Taniguchi et al.
patent: 4792678 (1988-12-01), Spies

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