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US 7,248,541 B2Granted
Optical disk device and access method for optical disk device
AssigneeKabushiki Kaisha Toshiba
InventorMinoru Yonezawa
Life of this patent
Estimating the term…
Abstract
An optical disk device has a recording information management portion which detects a distribution of a recorded region R and an unrecorded region M based on reflection light received by an optical head and an access target setting circuit which determines an access target of an optical head so as to make access to a target position of a recording layer of an optical disk while avoiding the unrecorded region M based on the detected distribution of the regions. Since an access is made while passing through only the recorded region R, a servo operation can be stabilized.
Claims5
An optical disk device comprising:
- an optical head which emits a laser light to an optical disk having a recording layer and receives a reflection light to carry out one of a recording process and reproduction process;
- a detecting unit which detects a distribution of a recorded region and an unrecorded region of the optical disk based on a reflection light received by the optical head;
- a control unit which controls the optical head so as to make access to a target position of a recording layer of the optical disk while avoiding the unrecorded region based on a distribution of a recorded region and an unrecorded region detected by the detecting unit;
- and
- wherein, in the case where the optical disk has a plurality of recording layers and the target position is in a second recording layer different from a first recording layer to which the optical head is currently positioned, and in the case where an access is made to the unrecorded region of the second recording layer when an interlayer jump is carried out at a currently accessed position, the control unit moves the optical head to a position of the first recording layer corresponding to a position at which the unrecorded region of the second recording layer does not exist, and then the optical head is jumped in an interlayer manner to be moved to the target position.
2 more elements
An access method for an optical disk device comprising:
- emitting a laser light to an optical disk having a recording layer and receiving a reflection light, thereby detecting a distribution of a recorded region and an unrecorded region of the optical disk based on a reflection light received by an optical head for carrying out one of a recording process and reproduction process;
- controlling the optical head so as to access a target position of a recording layer of the optical disk while avoiding the unrecorded region based on the detected distribution of a recorded region and an unrecorded region;
- and
- wherein, in the case where the optical disk has a plurality of recording layers and the target position is in a second recording layer different from a first recording layer to which the optical head is currently positioned, and in the case where an access is made to the unrecorded region of the second recording layer when an interlayer jump is carried out at a currently accessed position, control of the optical head moves the optical head to a position of the first recording layer corresponding to a position at which the unrecorded region of the second recording layer does not exist, carries out an interlayer jump of the optical head, and then moves it to the target position.
1 more element
An access method for an optical disk device comprising:
- emitting a laser light to an optical disk having a recording layer and receiving a reflection light, thereby detecting a distribution of a recorded region and an unrecorded region of the optical disk based on a reflection light received by an optical head for carrying out one of a recording process and reproduction process;
- controlling the optical head so as to access a target position of a recording layer of the optical disk while avoiding the unrecorded region based on the detected distribution of a recorded region and an unrecorded region;
- and
- wherein, when the optical disk has a plurality of recording layers to be stacked and it is detected that the unrecorded region exists in a first recording layer to which the optical head is currently positioned and that the target position exists in a second recording layer different from the first recording layer, control of the optical head makes access to the target position after an interlayer jump to the second recording layer is carried out without moving the optical head in the first recording layer.
1 more element
Dependencies are inferred from the claim text.