Rotary encoder using reflected light

Details Rotary encoder using reflected light Rotary encoder using reflected light

1990-11-06

1991-07-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

050361929

ABSTRACT:
This invention discloses a linear/rotary encoder for detecting the state of movement of a grating. The encoder of this invention comprises a system for directing a coherent beam of light onto a predetermined position or positions of a diffraction grating formed on an object to be measured, a converging optical system having a reflection plane at a position on which light is converged, for again making incident on the respective different positions diffracted lights which exit from the position, an interference optical system for forming interference fringes by superposing beam diffracted from the diffraction grating at the predetermined position or positions, and light receiving elements for photoelectrically converting the interference fringes obtained through the interference optical system.

REFERENCES:
patent: 3726595 (1973-04-01), Matsumoto
patent: 3738753 (1973-06-01), Huntley, Jr.
patent: 3756723 (1973-09-01), Hock
patent: 3842261 (1974-10-01), MacGovern et al.
patent: 3891321 (1975-06-01), Hock
patent: 3983391 (1976-09-01), Clemons
patent: 4629886 (1986-12-01), Akiyama et al.
patent: 4676645 (1987-06-01), Taniguchi et al.
patent: 4677301 (1987-06-01), Tanimoto et al.

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