Diffracted beam encoder

Details Diffracted beam encoder Diffracted beam encoder

1989-11-17

1991-05-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, 356356, G01D 534, G01B 1102

Patent

active

050177770

ABSTRACT:
A method for detecting a state of rotation of a rotary scale having a diffraction grating therein in which a radiation beam is directed to a first place on the diffraction grating to generate first and second diffracted beams. The first and second diffracted beams are re-diffracted at the first place to form a first re-diffracted beam and a second re-diffracted beam. The first and second re-diffracted beams are directed to a second place on the diffraction grating substantially opposite the first place with respect to the center of rotation of the rotary scale. The first and second re-diffracted beams are diffracted at the second place to interfere with each other so that an interference beam is formed. The interference beam is converted into a signal to detect the state of rotation of the rotary scale.

REFERENCES:
patent: 3612695 (1971-10-01), Bouwhuis et al.
patent: 3756723 (1973-09-01), Hock
patent: 4143268 (1979-03-01), Marold et al.
patent: 4629886 (1986-12-01), Akiyama et al.
patent: 4676645 (1987-06-01), Taniguchi et al.
patent: 4792678 (1988-12-01), Spies
patent: 4829342 (1989-05-01), Nishimura
patent: 4868385 (1989-09-01), Nishimura

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