Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2006-03-14
2006-03-14
Miller, Brian E. (Department: 2652)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044280, C369S053280
Reexamination Certificate
active
07012859
ABSTRACT:
A method and apparatus for controlling reproduction of an optical recording medium is disclosed. According to the method and apparatus, a moving direction of an object lens on a disc is detected from a slope of a differential phase detection (DPD) error signal in case that the tracking control of the disc is performed by the DPD error signal, and the tracking control is performed using the detected moving direction of the object lens. Thus, the proceeding direction of the object lens can be easily and accurately detected in the disc from which the detection of a mirror signal is not facilitated, i.e., in the disc whose tracking is controlled by the DPD error signal during reproduction. Since it can be easily discriminated whether the phase of the tracking error signal to be in a track-on state when a track servo is turned on is a land or a groove, the stability of the servo can be secured, and an automatic breaking can be achieved.
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Agustin Peter Vincent
Lee Hong Degerman Kang & Schmadeka
LG Electronics Inc.
Miller Brian E.
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