Method and apparatus for identifying the type of optical...

Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval

Reexamination Certificate

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C369S044270, C369S053230

Reexamination Certificate

active

10419786

ABSTRACT:
A method and an apparatus for identifying the type of an optical recording medium are provided. The method includes detecting a surface reflected signal SSand a writable-surface reflected signal SRof an optical recording medium while performing a focus search using a first optical system, counting a time difference DTSbetween a high peak and a low peak of the surface reflected signal SS, counting a time difference DTRbetween the high peak of the surface reflected signal and a high peak of the writable-surface reflected signal SR, obtaining DT by substituting DTRand DTSinto the following equation:DT=(DTR)a(DTS)b⁢⁢(a-b≥12)and comparing DT with a reference time T, and driving the first optical system if DT is greater than T and driving a second optical system if DT is not greater than T.

REFERENCES:
patent: 6111832 (2000-08-01), Tsuchiya et al.
patent: 6147941 (2000-11-01), Kumagai
patent: 6466531 (2002-10-01), Lee
patent: 6816443 (2004-11-01), Hwang
patent: 10-49975 (1998-02-01), None
patent: 11-149640 (1999-06-01), None
patent: 2000-215454 (2000-08-01), None
patent: 2000-260109 (2000-09-01), None
patent: 2003-233912 (2003-08-01), None
patent: 2000-0052232 (2000-08-01), None
Chinese Patent Office Action issued Mar. 11, 2005 in the corresponding Chinese application.

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