Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1990-02-06
1992-12-08
Richardson, Robert L.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4432, 369 4435, 369 4441, G11B 700
Patent
active
051703840
ABSTRACT:
A tracking control apparatus of an optical signal recording/reproduction apparatus, records and reproduces a data signal by causing a light spot focused on an optical recording medium to trace data-recording tracks and then accesses the light spot to a desired track. The tracking control apparatus varies a tracking-servo target value in a direction of performing the track-jumping operation, and then, if the tracking error signal exceeds a predetermined position level, the tracking control apparatus repeatedly varies the polarity of the tracking error signal until the light spot eventually arrives at the target track subject to the track-jumping operation. By virtue of the structure mentioned above, the tracking control apparatus can stably perform the track-jumping operation even when external disturbances, such as vibration, occur in the servo system.
REFERENCES:
patent: 4057832 (1977-11-01), Kappert
patent: 4539664 (1985-09-01), Deguchi et al.
patent: 4541083 (1985-09-01), Maeda et al.
Edahiro Yasuaki
Kikuchi Noboru
Kurahashi Akira
Matsushita Electric - Industrial Co., Ltd.
Richardson Robert L.
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