Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1997-11-03
2000-01-11
Hindi, Nabil
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
G11B 700
Patent
active
060143541
ABSTRACT:
A farfield pattern which occurs when a light spot passes through a pit on a disk is applied as two-phase pulses to a pulse issuing portion through photo detectors, current-voltage converters and binarizing circuits. The pulse issuing portion issues, to a difference detector, pulses corresponding to the two-phase pulses, respectively, and each having a time width starting from the time point of level change of one of the two-phase pulses and terminating at earlier one between the time point of return of the one pulse to the initial level and the time point of change in the other binary signal and the time point of level change of the other pulse. The difference detector applies a phase difference pulse corresponding to the two pulses applied thereto to a LPF. The phase difference pulse converted into an analog signal by the LPF is issued as a tracking error signal. Therefore, when a glitch is mixed into the output signal of the photo detectors, the width of the pulse issued from pulse issuing portion increases only correspondingly to the glitch, and an influence on the tracking error signal by the glitch is suppressed to be minimum, so that stable tracking servo-control is achieved.
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Nomura Masaru
Yamaguchi Takeshi
Conlin David G.
Gamache Richard E.
Hindi Nabil
Sharp Kabushiki Kaisha
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