Optical information recording medium, optical information...

G - Physics – 11 – B

Patent

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G11B 7/007 (2006.01)

Patent

CA 2410779

An optical information recording medium according to the present invention includes a first information recording layer on which information is to be recorded by laser light; and a second information recording layer on which information is to be recorded by the laser light which has passed through the first information recording layer. The first information recording layer includes at least one of a reproduction-only area and a recording and reproduction area. The second information recording layer includes a test recording area. At least one of the reproduction-only area and the recording and reproduction area, and the test recording area is located such that one of the reproduction-only area and the recording and reproduction area includes an area of the first information recording layer through which the laser light for recording information in the test recording area passes.

L'invention concerne un support d'enregistrement d'informations optiques comprenant une première couche d'enregistrement d'informations sur laquelle des informations sont enregistrées au moyen d'un faisceau laser, ainsi qu'une seconde couche d'enregistrement d'informations sur laquelle des informations sont enregistrées au moyen d'un faisceau laser ayant dépassé la première couche d'enregistrement d'informations, ce support étant caractérisé en ce que la première couche d'enregistrement d'informations comprend au moins une zone de lecture uniquement et une zone d'enregistrement/lecture, et en ce que la seconde couche d'enregistrement d'informations, laquelle comprend une zone d'enregistrement test, possède au moins l'une des zones, soit la zone de lecture seule, soit la zone d'enregistrement/lecture, soit la zone test, de façon que, soit la zone de lecture seule, soit la zone d'enregistrement/lecture, comprenne une zone, dans la première couche d'enregistrement d'informations, à travers laquelle un faisceau laser passe aux fins d'enregistrement d'informations dans la zone d'enregistrement test.

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