Phase change optical recording medium

G - Physics – 11 – B

Patent

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Details

G11B 7/24 (2006.01) G11B 7/243 (2006.01) G11B 7/254 (2006.01) G11B 7/257 (2006.01)

Patent

CA 2191691

A phase change optical recording medium in which writing, reading and/or erasing of information is conducted by utilizing change of phase of a recording layer by irradiation of a light beam, said recording medium comprising a substrate, a first transparent protecting layer of an amorphous dielectric material on the substrate, a recording layer of a chalcogen alloy on the first transparent protecting layer, an adhesive layer of a crystalline sulfide 10 to 30 nm thick on the second recording layer, a second transparent protecting layer of an amorphous dielectric material on the adhesive layer, and a reflection layer of a crystalline alloy mainly comprising aluminum on the adhesive layer.

'invention est un support d'enregistrement optique sur lequel l'enregistrement, la lecture et/ou l'effacement des informations se fait en changeant la phase d'une couche d'enregistrement en irradiant celle-ci avec un faisceau lumineux. Ce support est constitué d'un substrat, d'une première couche protectrice transparente faite d'un matériau diélectrique amorphe déposé sur le substrat, d'une couche d'enregistrement faite d'un alliage chalcogéné déposé sur la première couche protectrice, d'une couche adhésive faite d'un sulfure cristallin d'une épaisseur de 10 à 30 mm déposé sur la seconde couche d'enregistrement, d'une seconde couche protectrice transparente faite d'un matériau diélectrique amorphe déposé sur la couche adhésive et d'une couche réfléchissante faite d'un alliage cristallin contenant surtout de l'aluminium et qui est déposé sur la couche adhésive.

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