Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1998-04-30
2000-04-11
Hindi, Nabil
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4429, 369 4435, G11B 700
Patent
active
060495138
ABSTRACT:
A method and an apparatus in which a bias of a focus servo circuit is adjusted so that a signal surface of an optical disc may be placed within a focus depth of a laser beam. In the apparatus for adjusting a focus bias, a characteristic variation of a focus bias is checked on the basis of a level of a reproduction signal, i.e., an RF signal, supplied from the optical pickup, and a focus bias is adjusted in response to a checked characteristic variation. Therefore, although the characteristics of the focus servo section is varied, the focus bias is optimally adjusted in response to the characteristic variation, so that an accurate focusing operation is performed.
REFERENCES:
patent: 5339298 (1994-08-01), Saito
patent: 5627807 (1997-05-01), Abe
patent: 5712842 (1998-01-01), Yamamoto et al.
patent: 5805559 (1998-09-01), Murakami et al.
Daewoo Electronics Co. Ltd.
Hindi Nabil
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