Tracking by cross correlating central apertures of multiple beams
作者： Ruud Vlutters , Bin Yin
DOI:
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摘要: The present invention provides a method and apparatus for robust tracking at narrow track-pitches on optical discs, enabling higher densities Blu-ray Discs (5) as well near-field discs. Increasing radial density results in loss of diffraction within the numerical aperture lens. Due to this diffraction, current methods, such Push-Pull Differential Phase Detection (DPD), will stop working. that relies cross-correlating central (CA) signals 3 spots (22, 24, 26) are positioned there spot (24) left (22) right (26) (4) . By using CA signals, tangential is used, which hardly affected by track-pitch reduction.
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