Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1997-09-15
1998-11-10
Young, W. R.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4425, 369 4429, 369 54, G11B 7095
Patent
active
058354603
ABSTRACT:
To move an object lens out of focalization on a layer and to accelerate it upwardly, a drive signal DRV is set HIGH, and a focus OPEN signal is set LOW. After a value a counter exhibits at this time is held in a register T1, the counter is reset at zero. Then a value the counter exhibits upon FZC+ being LOW is held in a register T2.sub.A, and a value the counter exhibits upon FZC- being HIGH is held in a register T2.sub.B. The value of a register T3 is calculated from T1 and the average of T2.sub.A and T2.sub.B, and when the counter value becomes equal to the sum of T1 and T3, DRV is set HIGH. After FZC- becomes LOW, OPEN is set HIGH, and the focus jump operation is completed.
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Patent Abstracts of Japan, vol. 5, No. 146, P-080, & JP 56-80835, Sep. 16, 1981.
Frommer William S.
Sony Corporation
Young W. R.
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