Method for adjusting a focus position on an optical disc and...

Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal

Reexamination Certificate

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C369S044290, C369S053280

Reexamination Certificate

active

07944787

ABSTRACT:
In a method for adjusting a focus position for an optical disc, onto/from which in formation is recorded or reproduced, while adjusting the focus position of an optical reproducing means, upon a recording surface of an optical information recording medium having an area where information of the optical information recording medium is recorded in advance, comprising the following steps of: memorizing plural numbers of information relating to focus positions determined appropriately, which can be obtained from the area where the information of the optical information recording medium is recorded in advance; and adjusting the focus position for the optical disc loaded into an apparatus, from at lease one (1) signal relating to the focus position, which can be obtained from the optical disc, with utilizing a relationship between the plural numbers of information relating to the focus positions determined appropriately, memorized in advance, when reproduction of the information is impossible when the optical disc is loaded into the apparatus, thereby providing the focus position adjusting method and an optical disc apparatus applying the same therein, for enabling an appropriate focus adjustment even in case when DMA area cannot read out due to damages or defects therein.

REFERENCES:
patent: 2002/0131195 (2002-09-01), Dehnert
patent: 2005/0249059 (2005-11-01), Wang et al.
patent: 2000-155961 (2000-06-01), None
patent: 2001-184678 (2001-07-01), None

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