Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1988-08-11
1992-04-14
Envall, Jr., Roy N.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4433, 369 4435, 369 4442, G11B 7095
Patent
active
051054094
ABSTRACT:
Disclosed is an optical recording and reproducing apparaus comprising a light source directing a light spot toward a recording medium, a detection system detecting light reflected from the recording medium to derive an electrical signal from the reflected light, an information processing circuit modulating the intensity of the light spot according to writing pulses to record information on the recording medium and using the electrical signal to reproduce information from the recording medium, and a tracking servo circuit carrying out tracking servo operation on the basis of the electrical signal and including an extracting circuit connected to a source of extracting pulses having a pulse width at least equal to the writing pulse width so that writing pulse parts contained in the electrical signal are extracted during recording information, whereby a track offset occurring during information recording can be minimized, and the stability of the tracking servo system can be improved.
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Kaku Toshimitsu
Maeda Takeshi
Shigematsu Kazuo
Sugiyama Hisataka
Takasago Masahiro
Envall Jr. Roy N.
Hitachi , Ltd.
Young W. R.
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