Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2011-05-03
2011-05-03
Blouin, Mark (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
Reexamination Certificate
active
07936646
ABSTRACT:
Spherical aberration correction is provided for CD writing in a double (CD+DVD), triple (CD+DVD+BD) or quadruple (CD+DVD+BD+HD-DVD) writer, which use the same light path for CD and DVD. In an optical drive that uses numerous laser wavelengths combined into one light path each wavelength having a different numerical apertures a correction for spherical aberration is made to correct for effective numerical apertures of the light path that becomes shifted up from the original value to higher values. The correction in spherical aberration removes that effect of the higher effective NA and defects, particularly in writing, are corrected.
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Granados Alberto Martin-Consuegra
McCormack James Joseph Anthony
Blouin Mark
Koninklijke Philips Electronics , N.V.
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