Focusing control method for reading/writing optical disc

Details Focusing control method for reading/writing optical disc Focusing control method for reading/writing optical disc

2007-05-30

2009-12-08

Edun, Muhammad N. (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044290, C369S044350, C369S044320, C369S112230, C369S112020

Reexamination Certificate

active

07630278

ABSTRACT:
An optical reading/writing apparatus has an optical head that includes a collimator and a lens. For efficient and reliable focusing control for writing an empty optical disk, calibration of focus offset and spherical aberration is executed by setting a boundary and performing data-reading in an OPC area only with combinations of focus offset and spherical aberration within the boundary. Accordingly, an optimum combination of focus offset and spherical aberration is determined for focusing compensation in subsequent writing operation of the empty disk.

REFERENCES:
patent: 7215606 (2007-05-01), Yonezawa
patent: 2003/0202437 (2003-10-01), Yamada et al.
patent: 2004/0136281 (2004-07-01), Yanagisawa et al.

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