Disc drive and tracking servo pull-in method
AssigneeSony Corporation
InventorYuichi Suzuki
Life of this patent
Estimating the term…
Abstract
A disc drive includes an optical pickup that emits laser light to a predetermined layer position via an objective lens and detects reflection light of the laser light, a tracking mechanism that drives the objective lens in a tracking direction, a tracking error signal generation unit that generates a tracking error signal, based on a light detecting signal for the reflection light obtained by the optical pickup, a tracking servo control unit that performs a tracking servo control based on the tracking error signal, and a control unit that makes the tracking servo control unit perform tracking servo pull-in on the basis of a frequency measurement result of the tracking error signal and a recording or non-recording determination result based on the light detecting signal.
Claims13
A disc drive comprising:
- an optical pickup configured to emit laser light to a predetermined layer position via an objective lens and detect reflection light of the laser light with respect to an optical disc recording medium where marks are recorded at the predetermined layer position through application of laser light;
- a tracking mechanism configured to drive the objective lens in a tracking direction which is a direction parallel to a radius direction of the optical disc recording medium;
- a tracking error signal generation unit configured to generate a tracking error signal indicating a position error of an irradiation spot of the laser light with respect to a track, which is formed at the predetermined layer position through mark recording, based at least in part on a light detecting signal for the reflection light obtained by the optical pickup;
- a tracking servo control unit configured to perform a tracking servo control based at least in part on the tracking error signal;
- and
- a control unit configured to make the tracking servo control unit perform tracking servo pull-in at least in part on the basis of a frequency measurement result of the tracking error signal and a recording or non-recording determination result based at least in part on the light detecting signal, in a state where a tracking servo control by the tracking servo control unit is turned off.
A tracking servo pull-in method in a disc drive including an optical pickup configured to emit laser light to a predetermined layer position via an objective lens and detect reflection light of the laser light with respect to an optical disc recording medium where marks are recorded at the predetermined layer position through application of laser light;
- a tracking mechanism configured to drive the objective lens in a tracking direction which is a direction parallel to a radius direction of the optical disc recording medium;
- a tracking error signal generation unit configured to generate a tracking error signal indicating a position error of an irradiation spot of the laser light with respect to a track which is formed at the predetermined layer position through mark recording, based at least in part on a light detecting signal for the reflection light obtained by the optical pickup;
- and a tracking servo control unit configured to perform a tracking servo control based at least in part on the tracking error signal, the method comprising:
- causing the tracking servo control unit to perform tracking servo pull-in at least on the basis of a frequency measurement result of the tracking error signal and a recording or non-recording determination result based at least in part on the light detecting signal, in a state where a tracking servo control by the tracking servo control unit is turned off.
Dependencies are inferred from the claim text.