Methods and apparatus for detecting and correcting...

Details Methods and apparatus for detecting and correcting... Methods and apparatus for detecting and correcting...

G - Physics

11

B

G11B 7/14 (2006.01) G11B 7/09 (2006.01) G11B 7/125 (2006.01) G11B 7/135 (2006.01)

Patent

CA 2321061

Methods and apparatus are provided for detecting and correcting magnification errors while simultaneously reading or writing multiple data tracks with a multi-beam optical disk drive. An optical head for the optical disk drive includes a plurality of laser diodes that generate multiple light beams for reading from or writing to the optical disk, means for detecting a magnification error, and means for compensating for the magnification error to align the multiple light beams with multiple data tracks. A number of opto- mechanical systems are provided for correcting the magnification errors in the beams.

On décrit des procédés et un appareil qui détectent et corrigent des erreurs d'amplification alors que s'effectue simultanément la lecture ou l'écriture de plusieurs pistes de données avec une unité de disque optique à plusieurs faisceaux. Une tête optique destinée à l'unité de disque optique comprend plusieurs diodes laser qui génèrent plusieurs faisceaux de lumière servant à la lecture du disque optique ou à l'écriture sur ce dernier; un dispositif de détection d'une erreur d'amplification; et un dispositif de compensation de l'erreur d'amplification qui aligne les multiples faisceaux sur les multiples pistes de données. Plusieurs systèmes opto-mécaniques sont prévus pour corriger les erreurs d'amplification dans les faisceaux.

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