Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1998-01-09
2000-09-12
Edun, Muhammad
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4432, 369 58, 369 60, G11B 700
Patent
active
061187399
ABSTRACT:
An optical storage apparatus has an eccentricity measuring unit that measures an eccentricity amplitude of a medium and an eccentricity phase for a start position along one rotation of a disk. A region from the start position to an end position of one rotation of the medium which was measured is divided into a plurality of regions every predetermined rotational angle, and addresses are sequentially allocated to those regions. A sine value of a rotational angle, which is increased every predetermined rotational angle, has been stored in each address in an eccentricity memory. A read control unit forms an address (a) in an eccentricity memory corresponding to a rotating position of the medium where a light beam is irradiated at present while using the start position of one rotation of the medium as a reference and reads out a corresponding sine value sin.theta.a from the eccentricity memory by the designation of the address (a). An eccentricity correcting unit obtains an eccentricity amount (L) on the basis of the sine value read out from the eccentricity memory and the measurement values measured by the eccentricity measuring unit, thereby controlling a VCM positioner so as to set off the eccentricity amount (L).
REFERENCES:
patent: 5933397 (1999-08-01), Yamashita et al.
Ikeda Toru
Kishinami Masaya
Yabuki Eiji
Edun Muhammad
Fujitsu Limited
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