Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1990-12-03
1993-06-22
Psitos, Aristotelis
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4441, 369 4434, G11B 700
Patent
active
052220575
ABSTRACT:
A tracking servo method in an optical disk drive unit has the steps of providing a signal in accordance with a different in voltage level between two signals respectively reproduced from a pair of tracking sample flags arranged in positions shifted by predetermined distances from a tracking center on an optical disk; setting the signal in accordance with the voltage level difference to a tracking error signal; and positioning a light spot on the optical disk in the tracking center using the tracking error signal. The tracking servo method further has the step of normalizing the tracking error signal by a signal indicative of a difference between an average value of the two reproducing signals and a signal reproduced from a sample flag approximately arranged in the tracking center on the optical disk.
REFERENCES:
patent: 4779251 (1988-10-01), Burroughs
patent: 4779253 (1988-10-01), Getreuer et al.
patent: 4951275 (1990-08-01), Saitoh et al.
patent: 4967403 (1990-10-01), Ogawa et al.
patent: 5079756 (1992-01-01), Kuwabara
patent: 5144609 (1992-09-01), Takeda et al.
Shigemori Toshihiro
Suzuki Haruyuki
Hindi Nabil
Psitos Aristotelis
Ricoh & Company, Ltd.
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