Apparatus for detecting rotational displacement information of a

Details Apparatus for detecting rotational displacement information of a Apparatus for detecting rotational displacement information of a

1997-09-09

2000-05-02

Faber, Alan

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7811, 360 7303, 360 75, 369 54, 356138, 356 27, 318640, 25023117, G11B 5596

Patent

active

060579765

ABSTRACT:
An angular division apparatus for circumferentially dividing a rotating object into a plurality of areas by using Doppler pulses includes an optical head for applying a beam emitted from a light source unit to a rotating object and detecting Doppler pulses based on a shift of the frequency of the light scattered from the rotating object, and a counting unit for counting the Doppler pulses output from the optical head to determine the number of pulses for one revolution of the rotating object. The number of Doppler pulses for one revolution is divided by a division number for dividing the rotating object into a plurality of areas in the angular direction. The rotating object is divided into a plurality of areas in the angular direction thereof by using the number of Doppler pulses per divided area.

REFERENCES:
patent: 3426337 (1969-02-01), Black
patent: 4165495 (1979-08-01), Takahashi
patent: 4558383 (1985-12-01), Johnson
patent: 4613916 (1986-09-01), Johnson

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