Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
December 8, 2009
0Patent Application Number
117555520
Date Filed
May 30, 2007
0Patent Primary Examiner
Patent 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.
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