An optical disc with different wobble patterns in different...

G - Physics – 11 – B

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G11B 7/007 (2006.01) G11B 7/26 (2006.01) G11B 27/19 (2006.01) G11B 27/24 (2006.01)

Patent

CA 2460763

The S/N ratio is improved for recording data to grooves (2-1, 2-2) of an optical disc so that as much information as possible can be recorded at the lowest possible frequency band. An optical disc using wobble patterns to record different information has a first groove (2-1) having a first wobble pattern (22) in which one wobble period has a sharp rising edge and a gradual falling edge; and a second groove (2-2) having a second wobble pattern (24) in which one wobble period has a gradual rising edge and a sharp falling edge. Each of the first and the second wobble pattern is represented by a first fundamental and a second harmonic of a Fourier series. The polarity of the second harmonic, which is an even harmonic, of the second wobble pattern is opposite that of the first wobble pattern. A method for manufacturing this optical disc is also provided.

La présente invention permet d'améliorer le rapport S/B lors de l'enregistrement de données dans des sillons (2-1, 2-2) d'un disque optique et, ainsi, de stocker un maximum d'informations à la bande de fréquence la plus basse possible. Un disque optique présentant des motifs ondulés, destiné à l'enregistrement de diverses informations, comprend un premier sillon (2-1) décrivant un motif ondulé (22) dont la période d'ondulation est composée d'un flanc montant à pente raide et d'un flanc descendant à pente régulière·; ainsi qu'un deuxième sillon (2-2) décrivant un second motif ondulé (24) dont la période d'ondulation est composée d'un flanc montant à pente régulière et d'un flanc descendant à pente raide. Chaque motif est représenté par une première fondamentale et par une seconde harmonique d'une série de Fourier. La polarité de la seconde harmonique, qui est une harmonique paire, du second motif ondulé, est opposée à celle du premier motif ondulé. L'invention concerne également un procédé destiné à la fabrication de ce disque optique.

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