Rotation detector using dual position interference light

Details Rotation detector using dual position interference light Rotation detector using dual position interference light

1994-02-25

1994-11-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

053692713

ABSTRACT:
In a rotation detector, a light beam from a light irradiating device is projected onto a first scale of an optical scale comprising gratings having a constant period provided around a cylindrical member of a rotating member, the light beam modulated by the first scale is projected onto a second scale of the optical scale via a region away from the center of the rotation shaft of the rotating member, the light beams as a result of modulation by the second scale are sensed by a light sensing device, and information regarding the rotation of the rotating member is detected using signals from the light sensing device.

REFERENCES:
patent: 3756723 (1973-09-01), Hock
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patent: 4172994 (1979-10-01), Bergkvist
patent: 4433585 (1984-02-01), Levine
patent: 4792678 (1988-12-01), Spies
patent: 4819051 (1989-04-01), Jacobson
patent: 4820918 (1989-04-01), Igaki et al.
patent: 4987299 (1991-01-01), Kobayashi et al.
patent: 4988864 (1991-01-01), Michel et al.
patent: 5036192 (1991-07-01), Ishizuka et al.
patent: 5173601 (1992-12-01), Franz

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