G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.2
G11B 21/08 (2006.01) G11B 7/085 (2006.01) G11B 7/09 (2006.01)
Patent
CA 1213978
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.
439881
Johnson Albin K.
Muckle Alexander M.
Redderson Brad R.
Stahl Karl J.
Smart & Biggar
Storage Technology Partners II (through Stc Optical Disk Develop Managing General Partner)
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