| US 7,518,961 B2 | ||
| Optical disk recording and reproducing apparatus for recording and reproducing data in and from optical disk | ||
| Hiroshi Hasegawa, Kanagawa (Japan); and Hiromichi Kobori, Kanagawa (Japan) | ||
| Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan) | ||
| Filed on Mar. 08, 2006, as Appl. No. 11/370,408. | ||
| Claims priority of application No. 2005-281981 (JP), filed on Sep. 28, 2005. | ||
| Prior Publication US 2007/0070838 A1, Mar. 29, 2007 | ||
| Int. Cl. G11B 7/00 (2006.01) | ||
| U.S. Cl. 369—44.32 [369/53.19; 369/94; 369/44.29] | 13 Claims |
| 1. An optical disk recording and reproducing apparatus, comprising:
a focus unit that focuses an irradiation light beam on an optical disk having a plurality of data recording layers and a plurality
of tracks;
a drive unit that changes a direction of the irradiation light beam by moving the focus unit;
a tilt control unit that detects a tilt amount of the optical disk, computes a control operation amount in a band wider than
a rotation frequency of the optical disk based on the tilt amount, and controls the drive unit to move the focus unit based
on the control operation amount, the tilt control unit holding a control state of the control at an immediate pre-state of
an inter-layer jump in which the irradiation light beam is moved to a different data recording layer or a track jump in which
the irradiation light beam is moved to a different track during the inter-layer jump or the track jump.
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