Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1981-10-15
1983-11-22
Richardson, Robert L.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
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.
Hazel Robert L.
LaBudde Edward V.
Burroughs Corporation
Cass Nathan
Peterson Kevin R.
Rasmussen David G.
Richardson Robert L.
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