Information recording medium, reproducing device and...

G - Physics – 11 – B

Patent

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G11B 7/24 (2006.01) G11B 7/005 (2006.01) G11B 7/007 (2006.01)

Patent

CA 2719731

An information recording medium according to the present invention includes at least three information recording layers. If the readout power of a laser beam in reading information from an information recording layer L(n) is identified by Pw(n), and if the readout power of the laser beam in reading information from an information recording layer L(n+a) is identified by Pw(n+a), then a base thickness between the information recording layers is determined so that the intensity of the light when the information recording layer L(n+a) is irradiated with a laser beam having the readout power Pw(n) becomes equal to or lower than that of the light when the information recording layer L(n+a) is irradiated with a laser beam having the readout power Pw(n+a).

L'invention porte sur un support d'enregistrement d'informations qui comporte trois couches d'enregistrement d'informations ou plus. Lorsque la puissance de reproduction d'un faisceau laser requise pour la reproduction d'informations à partir d'une couche d'enregistrement d'informations (L(n)) est exprimée par (Pw(n)), et que la puissance de reproduction d'un faisceau laser requise pour la reproduction d'informations à partir de la couche d'enregistrement d'informations (L(n+a)) est exprimée par (Pw(n+a)), l'épaisseur de matériau de base entre les couches d'enregistrement d'informations est une épaisseur dans laquelle l'intensité lumineuse obtenue lorsque la couche d'enregistrement d'informations (L(n+a)) est exposée au faisceau laser possédant la puissance de reproduction (Pw (n)) est équivalente ou inférieure à l'intensité lumineuse obtenue lorsque la couche d'enregistrement d'informations (L(n+a)) est exposée au faisceau laser possédant la puissance de reproduction (Pw(n+a)).

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