Optical disc and apparatus for scanning the optical disc

Details Optical disc and apparatus for scanning the optical disc Optical disc and apparatus for scanning the optical disc

2005-02-01

2005-02-01

Edun, Muhammad (Department: 2655)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

C369S044280, C369S044130, C369S044260, C369S047100

Reexamination Certificate

active

06850477

ABSTRACT:
An optical disc is described for recording data, which disc has a recording area for recording data encoded in optical marks at a recording density. The recording area has circular or spiral tracks provided with a servopattern comprising headers alternating with track portions. The headers contain position information encoded in preformed marks. The track portions comprise periodic characteristics, e.g. a wobble, to synchronise the data writing and reading operations. For reliably detecting the headers the phase of the periodic characteristics comprises a phase jump at a predetermined distance before each header.

REFERENCES:
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patent: 5559777 (1996-09-01), Maeda et al.
patent: 6147961 (2000-11-01), Nagasawa et al.
patent: 6172952 (2001-01-01), Inokuchi et al.
patent: 0587019 (1994-03-01), None

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