Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1995-06-16
1996-07-30
Psitos, Aristotelis
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 60, 369 54, 369 47, G11B 700
Patent
active
055419011
ABSTRACT:
A signal read out from a disk by a pickup is written in a RAM. The signal written in the RAM is read out at a speed lower than the writing speed to perform a reproduction operation. When there is an abnormality of the servo, the writing to the RAM is stopped and the servo is returned to a predetermined operation point to perform a re-try. After the occurrence of the abnormality of the servo, whether a return data and a data on a position just in front of a position where the servo abnormality occurs coincide with each other or not is determined. When the data coincide with each other, data on the position where the abnormality occurs and positions subsequent thereto are written in the RAM. When the data do not coincide with each other, the servo repeats the re-try for a predetermined period of time.
REFERENCES:
patent: 5224087 (1993-06-01), Maeda et al.
patent: 5291467 (1994-03-01), Ishiwata et al.
patent: 5331616 (1994-07-01), Morita et al.
patent: 5351227 (1994-09-01), Ichikawa et al.
Okamoto Naruhiro
Watanabe Hiroyuki
Psitos Aristotelis
Rohm & Co., Ltd.
Tran Thang V.
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