Optical memory system providing improved focusing control

Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium

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Details

250201, 369 45, 369100, 369109, 369275, G11B 700

Patent

active

044173300

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 a plurality of spaced focusing optical holes having dimensions chosen based on the diameter of the focused laser beam spot. Traversal of these optical holes by the reading beam produces a reflected beam which varies in a manner dependent upon the quality of focusing of the beam. Peak detection circuitry responsive to this reflected beam is used to produce a high gain focusing signal which is combined with a low gain, high capture range focusing signal provided by a geometric focus detector to derive a precise, offset-free focusing control signal which is applied to a focusing motor to main precise focusing of the beam on the disk.

REFERENCES:
patent: 4038679 (1977-07-01), Bouwhuis et al.
patent: 4097730 (1978-06-01), Korpel
patent: 4290122 (1981-09-01), Bates et al.

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