Cardlike optical recording medium
AssigneeCanon Kabushiki Kaisha
InventorsKeiko Ikoma, Noriko Kurihara, Keiji Hirabayashi, Susumu Itoh
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Abstract
A cardlike optical recording medium comprises a substrate, a recording layer and a protective layer, wherein an ultra-hard film containing a carbon atom is provided at least on the side of said optical recording medium on which a laser beam for writing-reproducing is irradiated.
Claims7
In a cardlike optical recording medium comprising a transparent substrate having on one side, in sequence, a recording layer adapted to have information written thereupon and reproduced by a laser beam, and a protective layer subject to scratching or contamination, the improvement comprising providing on a second side of said transparent substrate an ultra-hard outer layer comprising a laser beam transmittable carbon matrix having at least one of an amorphous carbon phase to impart flexibility or a diamond phase to enhance hardness.
Dependencies are inferred from the claim text.