Title:
DISK UNIT
Document Type and Number:
Japanese Patent JP2007035160
Kind Code:
A
Abstract:
To remove an foreign material stuck to an objective lens in a disk unit with simple mechanism.
A tracking error detecting part 331 detects a tracking error signal based on a reproduced signal read out from an optical disk. When the tracking error signal is in a state in which it exceeds the supremum or the lowest limit of the prescribed amplitude range, it is estimated that a foreign material is stuck to an objective lens as a main cause, a tilt control part 342 performs tilt operation for a tilt adjusting part 343 to remove the foreign material. Confliction between the objective lens and the optical disk by tilt operation is not caused even in a near field system by operating gap servo by a gap servo control part 322.
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Inventors:
MATSUI TAKESHI
ISHIMOTO TSUTOMU
KIN YOSHITOSHI
ISHIMOTO TSUTOMU
KIN YOSHITOSHI
Application Number:
JP2005216947A
Publication Date:
February 08, 2007
Filing Date:
July 27, 2005
Export Citation:
Assignee:
SONY CORP
International Classes:
G11B7/135; G11B7/095
Attorney, Agent or Firm:
Toshikazu Marushima