Method and apparatus for adjusting a focus bias in an optical di

Details Method and apparatus for adjusting a focus bias in an optical di Method and apparatus for adjusting a focus bias in an optical di

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.

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