Optical disc device and reproduction method

Details Optical disc device and reproduction method Optical disc device and reproduction method

2007-11-30

2010-06-29

Feild, Joseph H (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S047490

Reexamination Certificate

active

07746748

ABSTRACT:
Due to the axial runout of an optical disc, a frequency of a high-frequency current to be superimposed onto a DC current could not be maintained. In order to solve the problem described above, a drive signal is generated by superimposing a high-frequency signal onto a DC current, the drive signal is applied to a laser beam light source, thereby the light source is driven; and a servo signal at a signal level corresponding to a defocus amount of the laser beam relative to the surface of the optical disc is generated based on a reflected light of the laser beam from the recording surface of the optical disc, and a low-frequency component of the servo signal is extracted, and thereby the frequency of the high-frequency signal to be superimposed onto the DC current in the light source driver is controlled based on the low-frequency component of the servo signal.

REFERENCES:
patent: 6747924 (2004-06-01), Muramatsu
patent: 7496011 (2009-02-01), Furukawa et al.
patent: 2005/0226126 (2005-10-01), Abe et al.
patent: 05-089465 (1993-04-01), None
patent: 09-223328 (1997-08-01), None

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