Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1986-10-08
1989-02-14
Psitos, Aristotelis M.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 32, 369111, G11B 2110, G11B 1722
Patent
active
048051624
ABSTRACT:
An optical disk servo system includes a coarse access and tracking system for optical head control and a fine access and tracking system for read/write beam control. Enlarged servo tracks are pre-recorded on the optical disk between bands of data track locations. The coarse system illuminates a relatively large area of the disk surface encompassing at least one of the servo tracks and detects light from the enlarged illuminated area. Suitable means including a photo-detector array identifies and controls the optical head position by means of the light returned from the illuminated servo track. Such photo-detection means are insensitive to light reflected from the data tracks. The fine access and tracking system uses a conventional, three spot tracking and read system, two spots for data track following and one spot for data track reading. The fine access and tracking system controls a galvanometer mirror or other suitable means steering the read spot beams. Data writing is accomplished by fine tracking a previously recorded data track and maintaining the write beam a constant distance therefrom.
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"Optical Servo Information on Magnetic Recording Disks", Schneider IBM Tech. Disclosure Bulletin, vol. 16, No. 4, Sep. 73.
Johnson Albin K.
Muckle Alexander M.
Reddersen Brad R.
Stahl Karl J.
Psitos Aristotelis M.
Storage Technology Partners II
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