Rotating state detection apparatus using a plurality of light be

Details Rotating state detection apparatus using a plurality of light be Rotating state detection apparatus using a plurality of light be

1988-05-17

1989-09-19

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, H01J 314

Patent

active

048683850

ABSTRACT:
A rotating state detection apparatus comprising, an optical device for detecting coherent beams toward a plurality of positions on a diffraction grating present along a rotational direction of a rotating object, an interfering device for superposing diffraction beams of a specific order with each other, the diffraction beams being diffracted at the plurality of different positions on the diffraction grating, and light-receiving device for receiving the superposed beams obtained by the interfering device, and for photoelectrically converting interference fringes formed by the superposed beams.

REFERENCES:
patent: 3493959 (1970-02-01), Cap
patent: 3726595 (1973-04-01), Matsumoto
patent: 3756723 (1973-09-01), Hock
patent: 3833299 (1974-09-01), Lang
patent: 4676645 (1987-06-01), Taniguchi et al.
Journal of Electronic Engineering, "High-Precision, Compact Rotary Encoder Uses Semiconductor Laser", pp. 50-51 (Feb. 1986).
1986 Precision Engineering Association Spring Meeting, pp. 5-6 (Mar. 1986).

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