Rotary encoder with scale member and interference of zero and fi

Details Rotary encoder with scale member and interference of zero and fi Rotary encoder with scale member and interference of zero and fi

1993-02-24

1994-06-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, 356356, G01D 534, G01B 1102

Patent

active

053230019

ABSTRACT:
An encoder includes a scale member provided on one of two bodies which are relatively rotated and have gratings arranged in a relative rotating direction and a light irradiator for irradiating a first region with beams. A diffracted image of the first region is projected on a second region of the scale member. The encoder further includes a detector for detecting the beams from the second region. The relative rotation of the other body is detected based on a detected result thereof. A scale whose relative rotation to a rotation detecting device is detected by being irradiated with the beams from the encoder. The scale includes a base member formed with a grating having surfaces inclined to incident beams. In addition, a driving system causes relative rotation between the two bodies. This system includes a device for relatively rotationally driving the two bodies and a controller for controlling a driving condition of the driving device. A motor unit includes a motor module having rotation of its body detected by a result of a light irradiator and rotary shaft provided with a scale member. This unit further includes a supporting device for integrally supporting the body, the light irradiator and the detector.

REFERENCES:
patent: 3756723 (1973-09-01), Hock
patent: 3770970 (1973-11-01), Trump
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: 4820919 (1989-04-01), Igaki et al.
patent: 4987299 (1991-01-01), Kabayashi et al.
patent: 4988864 (1991-01-01), Michel et al.
patent: 5124548 (1992-06-01), Igaki

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