Optical type encoder including diffraction grating for producing

Details Optical type encoder including diffraction grating for producing Optical type encoder including diffraction grating for producing

1989-03-09

1990-03-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250205, G01D 534, G01J 132

Patent

active

049123203

ABSTRACT:
An optical type encoder comprises a light source for supplying a light beam for illuminating a diffraction grating formed on a movable scale, photoelectric converting means for photoelectrically converting interference fringes formed by causing a plurality of diffracted lights created by the diffraction grating to interfere with one another to measure the displacement of the movable scale and outputting a predetermined signal, detecting means for receiving a predetermined diffracted light created by the diffraction grating and detecting any fluctuation of the intensity thereof, and control means for modulating the intensity of the light beam illuminating the diffraction grating, on the basis of a signal from the detecting means, so that the amplitude of the output signal from the photoelectric converting means may become substantially constant.

REFERENCES:
patent: 4360730 (1982-11-01), Breslow
patent: 4823001 (1989-04-01), Kobayashi et al.
patent: 4829342 (1989-05-01), Nishimura

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