Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1985-05-31
1991-04-30
Psitos, Aristotelis M.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369 4426, 369 4434, G11B 700, G11B 7007
Patent
active
050124609
ABSTRACT:
A method and apparatus for positioning and tracking a Random Access Memory (RAM) optical head over an information storage media having a plurality of tracks formed by optically readable deformations ("pits") in the media including, a central controller, a laser diode optical-system carrying head which is movable transversely of the tracks in incremental steps for coarse positioning of the head over a selected band of tracks and a servomechanism which positions the laser's objective lens over a specifically addressed track and maintains it there until another track is addressed. Also discussed is a unique method of generating a tracking error signal as an input to the servomechanism which includes the asynchronous detection of a sector mark and the generation of an independent clocking signal from the synchronous detection of off-track pairs of pits spaced uniformly between other data in the track to produce the tracking error signal.
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Meyer Russell A.
Miller Christopher
Mitchell Gary R.
Popovich Steve S.
Stanis William J.
Garland Steven R.
Hanes Richard W.
Information Storage, Inc.
Psitos Aristotelis M.
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