Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1996-03-14
1997-07-29
Young, W. R.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4434, 369 4435, 369 54, G11B 709
Patent
active
056527438
ABSTRACT:
A tracking control system according to the present invention includes an objective lens for converging a light beam at a point on a recording medium to form a converging spot; a galvano-mirror for receiving a driving signal and for moving the converging spot across tracks provided on the recording medium in response to the driving signal; a tracking error detecting section for generating a tracking error signal according to a position of the converging spot with respect to one of the tracks; a tracking servo control section for generating a first driving signal according to the tracking error signal and for feeding the first driving signal to the galvano-mirror as the driving signal, by which the galvano-mirror is driven so that the converging spot is located on the one track; a filtering circuit for generating an output as a same function of the tracking error signal as a galvano-mirror rotation driving signal is of the tracking error signal; and a correcting section for correcting the offset of the tracking error signal using the output of the filtering circuit.
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Takamine Kouichi
Watanabe Katsuya
Matsushita Electric - Industrial Co., Ltd.
Young W. R.
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