Optical information recording/reproducing system

G - Physics – 11 – B

Patent

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Details

G11B 7/007 (2006.01) G11B 7/00 (2006.01) G11B 7/08 (2006.01) G11B 7/09 (2006.01) G11B 7/0033 (2006.01)

Patent

CA 2131584

A high-density recording medium has data tracks and guide tracks formed on both sides of each of the data tracks. Intervals between the guide tracks are set in such a manner that the outer edges of two adjacent guide tracks correspond in position to two tracking laser beam spots on the recording medium. To allow use of either of the high-density recording medium, and a conventional recording medium on which intervals between guide tracks are set in such a manner that the inner edges of two adjacent guide tracks correspond in position to two tracking laser beam spots, control is performed such that polarity of a tracking control servo is selectively inverted depending upon which of the high-density and conventional recording medium is used.

Support d'enregistrement haute densité présentant des pistes de données et des pistes-témoins situées de chaque côté des pistes de données. Les intervalles séparant les pistes-témoins sont déterminés de façon que les bords extérieurs de deux pistes-témoins adjacentes se trouvent dans une position correspondant à celles de deux points de lecture à rayons lasers sur le support d'enregistrement. Pour permettre l'utilisation soit d'un support d'enregistrement haute densité, soit d'un support d'enregistrement ordinaire sur lesquels les intervalles entre les pistes-témoins sont établis de manière que les bords intérieurs de deux pistes-témoins adjacentes se trouvent dans une position correspondant à celle de deux points de lecture à rayons lasers, un contrôle est effectué pour faire en sorte que la polarité de la servocommande de lecture puisse être inversée en fonction de la densité d'enregistrement du support.

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