Optical memory system providing track following

Details Optical memory system providing track following Optical memory system providing track following

1981-10-15

1984-04-17

McElheny, Jr., Donald

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369275, G11B 700

Patent

active

044438702

ABSTRACT:
A laser optical system including a reading beam for reading optical data recorded in one or more tracks of a rotating disk optical recording medium. The disk includes a plurality of preformatted headers spaced along the track wherein each header includes first and second track following optical holes which are elongated in the direction of the track and disposed on opposite sides of the track center line in a staggered relationship along the track. Traversal of these track following holes by the reading beam produces a reflected beam which varies in a manner dependent upon the accuracy of positioning of the beam relative to the track center line. Up-down integration circuitry responsive to this reflected beam is used to produce a track following signal which is applied to a radial position control motor for maintaining the beam precisely on the track center line.

REFERENCES:
patent: 3919697 (1975-11-01), Walker
patent: 4094013 (1978-06-01), Hill et al.
patent: 4325135 (1982-04-01), Dil et al.
patent: 4331976 (1982-05-01), Kinjo et al.
patent: 4364118 (1982-12-01), Maeda et al.

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