Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1983-02-22
1985-09-03
Cardillo, Jr., Raymond F.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 46, 369 33, 369 32, G11B 700, G11B 2110
Patent
active
045396655
ABSTRACT:
An information reproducing apparatus having a tracking servo control loop for causing an information reading unit including device for detecting a tracking error signal for tracking an information bearing track on a disc, to track the information bearing track in accordance with the tracking error signal so as to reproduce information in accordance with an information signal read by the information reading unit. A circuit for extracting a discrimination signal for discriminating a negative feedback region of the tracking error signal is provided so that a tracking servo control loop is closed in the negative feedback region.
REFERENCES:
patent: 4037252 (1977-07-01), Janssen
patent: 4057832 (1977-11-01), Kappert
patent: 4338682 (1982-07-01), Hosaka et al.
patent: 4340950 (1982-07-01), Kosaka
patent: 4359635 (1982-11-01), Gross
patent: 4365324 (1982-12-01), Michaelis
Inoue Shigeki
Iso Yoshimi
Noda Tsutomu
Ohashi Shin-ichi
Aldous Alan K.
Cardillo, Jr. Raymond F.
Hitachi , Ltd.
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