Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1990-07-19
1992-02-11
Envall, Jr., Roy N.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 48, 369 59, 369 58, G11B 700
Patent
active
050880802
ABSTRACT:
Pairs of synchronizing marks are formed on a record carrier periodically. At least one of the marks in every pair is located away from a track center line on which information data are to be recorded. Those marks are recovered by a reading head and fed to a phase lock loop in order to minimize phase error of synchronization. The phase lock loop produces a pair of synchronizing signals so as to derive a phase error signal from either of the marks. Therefore, continual phase error signal for the phase lock operation is obtained even when the reading head locates away from the track center line. Accordingly, stability of the synchronization will be improved.
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patent: 4704711 (1987-11-01), Gerard et al.
Ishibashi Hiromichi
Tanaka Shin-ichi
Envall Jr. Roy N.
Matsushita Electric - Industrial Co., Ltd.
Tran Thang V.
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