| US 7,529,161 B2 | ||
| Information reproduction device and information reproduction method for reproducing information by switching to servo polarity corresponding to land track and groove track and information recording method for recording information by switching to servo polarity corresponding to land track and groove tract | ||
| Kazuhiro Nagata, Yokohama (Japan); and Minoru Yonezawa, Tokyo (Japan) | ||
| Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan) | ||
| Filed on Jan. 27, 2005, as Appl. No. 11/43,052. | ||
| Claims priority of application No. 2004-021651 (JP), filed on Jan. 29, 2004. | ||
| Prior Publication US 2005/0169136 A1, Aug. 04, 2005 | ||
| Int. Cl. G11B 7/00 (2006.01) | ||
| U.S. Cl. 369—44.28 [369/44.29] | 8 Claims |
| 1. An information reproduction method in which information from an information storage medium on which land and groove tracks
which can record information are alternately formed in a radial direction along wobbles that represent address information,
information reproduction method comprising:
determining a track structure of a current position traced by a light beam based on the address information imparted to reflected
light obtained from the information storage medium, and a track structure of a target position based on a target position
address included in a seek command;
controlling access to the address of the target position by switching between a first servo polarity corresponding to a land
track and a second servo polarity corresponding to a groove track at a predetermined timing as needed based on a determination
result of the two track structures; and
reproducing predetermined information imparted to the reflected light obtained from an area corresponding to the address of
the target position,
wherein when a condition of the servo polarity in a seek operation on the information storage medium is limited to the first
servo polarity, access to the address of the target position on a groove track is controlled by executing a seek operation
by the first servo polarity corresponding to a land track of the current position to access a land track that neighbors the
groove track of the target position on the basis of the determination result indicating that the track structure of the current
position is a land track and the track structure of the target position is a groove track, acquiring address information imparted
to wobbles along the land track, and switching the first servo polarity to the second servo polarity.
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