Optical recording medium drive apparatus and method of...

Details Optical recording medium drive apparatus and method of... Optical recording medium drive apparatus and method of...

2007-09-13

2010-06-29

Edun, Muhammad N. (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S053230, C369S053280, C369S053450, C369S044250

Reexamination Certificate

active

07746747

ABSTRACT:
In an optical recording medium drive apparatus, an optical recording medium is illuminated with a laser beam emitted from a head via an objected leans, and the head detects light reflected from the optical recording medium being illuminated with the laser beam. A signal generator generates a reflected light signal in accordance with the reflected light detected by the head. A controller drives the objective lens via a focusing unit, and detects peaks in the reflected light signal obtained when the objective lens is driven in a focusing direction. The controller determines whether the optical recording medium is of a single layer type or a multiple layer type by determining whether a pattern of the detected peaks is similar to one of patterns which can occur if the optical recording medium is of the single layer type.

REFERENCES:
patent: 5606546 (1997-02-01), Best et al.
patent: 2005/0068873 (2005-03-01), Chung
patent: 2005/0276199 (2005-12-01), Sugai
patent: 2004-342309 (2004-12-01), None
patent: 2005-155791 (2005-06-01), None
patent: 2006-277847 (2006-10-01), None
patent: 2007-520834 (2007-07-01), None
patent: WO 2005/031735 (2005-04-01), None

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