Rotation detector and controller for detecting rotation informat

Details Rotation detector and controller for detecting rotation informat Rotation detector and controller for detecting rotation informat

1996-02-06

1999-06-29

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356374, G01B 1114

Patent

active

059171820

ABSTRACT:
In an apparatus for detecting information on the rotation of an object using a grating interference system, the present invention provides a rotation detecting apparatus, which can be sufficiently miniaturized even when using another rotation information detecting section at the same time, and an apparatus for controlling the rotation using the same. The apparatus has a first detecting device for detecting by making the diffracted light from the diffraction grating interfere to detect rotation information of the object, a second detecting device for detecting the light from the predetermined data recording section to detect rotation information of the object, and a light beam illuminating device common to the first and second detecting means for illuminating the diffraction grating and the predetermined data recording section together.

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patent: 5483377 (1996-01-01), Kaneda et al.
patent: 5498870 (1996-03-01), Ishizuka
patent: 5663794 (1997-09-01), Ishizuka

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