Teijin Limited

Toru Horiguchi

Takashi Tomie

Atsushi Ebina

Hiroshi Hara

Kenji Nakatani

Junichi Ishimaru

In 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 with light, the recording layer is made of a material containing oxygen in an amount of 1 to 30 atomic %; or the recording medium comprises an additional transparent dielectric layer 1 to 10 nm thick between the recording layer and the underlying transparent dielectric layer and the inserted transparent dielectric layer in contact with the recording layer comprising oxygen in a molar ratio greater than a molar ratio of oxygen in the underlying transparent dielectric layer; or the transparent dielectric layer underlying and in contact with the recording layer comprises oxygen in a molar ratio greater than a molar ratio of oxygen in the other transparent dielectric layer.

Phase change optical recording medium and process for manufacturing same

Phase change optical recording medium containing oxygen and process for

An optical recording medium comprises a transparent substrate, a first dielectric layer, a recording layer, a second dielectric layer and a reflecting layer stacked in this order, wherein said first dielectric layer has a thermal conduction coefficient of 0.03 to 0.1 .mu.W/K, said second dielectric layer has a thermal conduction coefficient of 0.01 to 0.03 .mu.W/K, and said reflecting layer has a thermal conduction coefficient of 4 to 12 .mu.W/K, where the thermal conduction coefficient is defined as a product of the thermal conductivity and the layer thickness. The first and/or second dielectric layers may be of an amorphous metal nitride comprising Al and Si and optionally C and having bonds with hydrogen.

Optical and magnetooptical recording medium having a low thermal

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Hino, Japan

Toru Horiguchi