Optical scanning device

An optical scanning device for scanning a dual-layer optical record carrier. The device includes a spherical aberration compensation optical subsystem having a switchable liquid crystal cell for altering a wavefront deviation generated in a folding mirror including a non-periodic phase structure (NP...

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Bibliographic Details
Main Authors Hendriks, Bernardus Hendrikus Wilhelmus, De Vries, Jorrit Ernst
Format Patent
LanguageEnglish
Published 24.10.2006
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Summary:An optical scanning device for scanning a dual-layer optical record carrier. The device includes a spherical aberration compensation optical subsystem having a switchable liquid crystal cell for altering a wavefront deviation generated in a folding mirror including a non-periodic phase structure (NPS) located behind a polarization-selective reflective layer.