Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2005-11-08
2005-11-08
Huber, Paul W. (Department: 2653)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044350, C369S053280
Reexamination Certificate
active
06963521
ABSTRACT:
Disclosed herein is a disc drive apparatus for recording and reproducing data to and from an optical disc-like storage medium. The apparatus includes a wobble signal generating element for generating a wobble signal representative of information about the wobble detected based on reflected light from the optical disc-like storage medium, and a land/groove detecting element for determining, when the light beam fails to trace a specific track correctly on the storage medium, whether the emitted light beam is located on a land field or in a groove field. The land/groove detecting element further outputs a land/groove detection signal having a waveform inverted depending on whether the light beam is located on the land field or in the groove field. The apparatus also includes a moving direction determining element for determining a radial moving direction of the light beam over the disc signal surface based on a phase difference between the land/groove detection signal and a tracking error signal that represents how much the light beam deviates from the specific track on the disc signal surface, and a controlling element for executing control so as to prevent the light beam from moving in the direction determined by the moving direction determining element.
REFERENCES:
patent: 5696742 (1997-12-01), Ogata et al.
patent: 6469980 (2002-10-01), Takemura et al.
Frommer William S.
Huber Paul W.
Sony Corporation
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