Dual-stack optical data storage medium for write once recording

G - Physics – 11 – B

Patent

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G11B 7/24 (2006.01)

Patent

CA 2541595

A dual-stack optical data storage medium (10) for write-once recording using a focused radiation beam (9) having a wavelength .lambda. of approximately 655 nm is described. The radiation beam enters through an entrance face (8) of the medium (10) during recording. The medium comprises at least one substrate (1, 7) with present on a side thereof:~ a first recording stack (6), named L0, comprising a write-once type L0 recording layer, said first recording stack L0 having an optical reflection value RL0 and an optical transmission value TL0, a second recording stack (3), named L1, comprising a write-once type L1 recording layer, said second recording stack L1 having an effective optical reflection value RLleff. The first recording stack (6) is present at a position closer to the entrance face (8) than the second recording stack. (3). A transparent spacer layer (4) is sandwiched between the recording stacks (3, 6). The reflection values RL0 and RL1 eff are within the following ranges: 0.12 <= RL0 <= 0.18 and 0.12<= RL1eff <= 0.18 by which an improved sensitivity of the dual stack medium is achieved.

L'invention concerne un support optique bicouche (10) à écriture unique au moyen d'un faisceau de rayonnement focalisé (9) présentant une longueur d'onde .lambda. d'environ 655 nm. Ce faisceau de rayonnement pénètre par une face d'entrée (8) du support (10) pendant l'enregistrement. Ce support comprend au moins un substrat (1, 7) contenant sur une face: une première couche d'enregistrement (6), appelée L0, comportant une couche support d'information L0 du type à écriture unique, ladite première couche d'enregistrement L0 présentant une valeur de réflexion optique R<SB>L0</SB> et une valeur de transmission optique T<SB>L0</SB>,¿ ?une deuxième couche d'enregistrement (3), appelée L1, comportant une couche support d'information L1 du type à écriture unique, ladite deuxième couche d'enregistrement L1 présentant une valeur de réflexion optique effective R¿Lleff?. La première couche d'enregistrement (6) est située à un emplacement plus proche de la face d'entrée (8) que la deuxième couche d'enregistrement (3). Une couche d'espacement transparente (4) est intercalée entre les couches d'enregistrement (3, 6). Les valeurs de réflexion R<SB>L0 </SB>et R¿L1eff ?se situent dans les plages suivantes: 0,12 = R<SB>L0</SB> = 0,18 et 0,12 = R¿L1eff? = 0,18, permettant ainsi d'améliorer la sensibilité du support bicouche.

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