Encoder with an optical scale and interference of zero and first

Details Encoder with an optical scale and interference of zero and first Encoder with an optical scale and interference of zero and first

1993-06-04

1996-01-02

Nicols, Steven L.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023116, H01J 314

Patent

active

054811066

ABSTRACT:
An encoder capable of detecting movement information on a moving body with high accuracy without being affected by environmental changes, wherein movement information on a moving body is detected by causing a luminous flux to impinge upon a first scale section of an optical scale which is provided on the moving body and which consists of gratings of a fixed pitch, causing the luminous flux to impinge upon a second scale section of the optical scale, and receiving the luminous flux which has undergone light modulation at the second scale section, and wherein a light adjustment device for intercepting or attenuating a +1st order or -1st order diffracted ray of diffracted rays of light from the first scale section is provided in the optical path extending from the first scale section, an optical image having an intensity distribution of the same grating pitch as the first scale section being formed on the second scale section mainly by the zero order and the -1st order diffracted rays or by the zero order and the +1st order diffracted rays.

REFERENCES:
patent: 4792678 (1988-12-01), Spies
patent: 4820918 (1989-04-01), Igaki et al.
patent: 4988864 (1991-01-01), Michel et al.
patent: 5126562 (1992-06-01), Ishizuka et al.
patent: 5302821 (1994-04-01), Igaki et al.
patent: 5323001 (1994-06-01), Igaki et al.

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