Disc-shaped recording medium, disc driving device and disc...

Details Disc-shaped recording medium, disc driving device and disc... Disc-shaped recording medium, disc driving device and disc...

G - Physics

11

B

G11B 7/007 (2006.01) G11B 7/085 (2006.01) G11B 7/09 (2006.01) G11B 7/24 (2006.01) G11B 19/12 (2006.01) G11B 20/12 (2006.01) G11B 27/00 (2006.01) G11B 27/02 (2006.01) G11B 7/125 (2006.01)

Patent

CA 2486969

With the disc-shaped recording medium, or the disc manufacturing method according to the present invention, for both the single-layer disc and the multi-layer disc, a recording layer L0, which is to be the first layer, is at the same distance, along the direction of disc thickness, from the surface of the cover layer CVLs on which falls the laser light. For the multi-layer disc, the second layer L1 and the following layer(s) are formed at the locations which are closer to the cover layer CVLs than the first layer L0. Management information may be recorded by mobbling grooves, each layermay have tert areas, defect information, a replacement area. Thus, it is possible to improve compatibility, reliability and accessibility between a single-layer disc and a multi-layer disc. The spherical aberration for the recording/reproducing light may be controlled with respect to the selected layer.

Avec le support d'enregistrement en forme de disque, ou le proc~d~ de fabrication de disques, disque monocouche et disque multicouche, selon la pr~sente invention, une couche d'enregistrement L0, qui doit Útre la premi­re couche, est ~ la mÚme distance, dans le sens de l'~paisseur de disque, par rapport ~ la surface de la couche de revÚtement CVLs qui re×oit la lumi­re laser. En ce qui concerne le disque multicouche, la deuxi­me couche L1 et la ou les couches suivantes sont form~es au niveau des emplacements qui sont plus proches de la couche de revÚtement CVLs que de la premi­re couche L0. Il est ainsi possible d'am~liorer la compatibilit~, la fiabilit~ et l'accessibilit~ entre un disque monocouche et un disque multicouche.

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