Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1997-01-14
1998-05-26
Tran, Thang V.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4429, 369 4425, G11B 7085
Patent
active
057577471
ABSTRACT:
A tracking error signal is converted into digital data by an A/D converter. A compensation circuit performs gain and phase compensation operations in accordance with the frequency of the digital data. A kick signal generation circuit turns off a switch in access processing and outputs a kick signal. A comparator detects the magnitude relationship between output data from a filter and a reference level. During data read processing, a system controller sets the reference level at R1, detects the disturbance of the rotation frequency of a disk, and appropriately sets the compensation characteristic of the compensation circuit. During access processing, the system controller sets the reference level at R2, detects the moving amount of a pickup, and if the moving amount is large, sets the value of the kick signal to be small.
REFERENCES:
patent: 4835754 (1989-05-01), Yamamoto et al.
patent: 5216560 (1993-06-01), Noguchi
patent: 5408454 (1995-04-01), Hasegawa
patent: 5548569 (1996-08-01), Shimizuame et al.
patent: 5621709 (1997-04-01), Takahashi
Kabushiki Kaisha Toshiba
Tran Thang V.
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