Record carrier with a servo track having wobble with reduced...

Details Record carrier with a servo track having wobble with reduced... Record carrier with a servo track having wobble with reduced...

2006-09-26

2006-09-26

Miller, Brian E. (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S275300, C369S275400, C369S059250

Reexamination Certificate

active

07113467

ABSTRACT:
A record carrier (1) has a servo track (4) indicating an information track (9) intended for recording information blocks represented by marks, this servo track (4) having a periodic variation of a physical parameter. Due to cross-talk, there exists a variation in the wobble signal called wobble beat. The track pitch t and the wobble period p, p being the length of a wobble period, are chosen in such a way that 2πt/p≈n+½ where n is integer. The choice results in a reduced wobble beat. A recording and/or playback device has apparatus for recording/reading the information blocks and for generating a wobble signal.

REFERENCES:
patent: 4901300 (1990-02-01), Van Der Zande et al.
patent: 5187699 (1993-02-01), Raaymakers et al.
patent: 5930228 (1999-07-01), Miyamoto et al.
patent: 6256282 (2001-07-01), Yamagami et al.
patent: 6266318 (2001-07-01), Honda et al.
patent: WO 0043996 (2000-07-01), None

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