Optical information recording medium having protection layers wi

Details Optical information recording medium having protection layers wi Optical information recording medium having protection layers wi

1994-03-29

1995-09-26

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Radiation sensitive composition or product or process of making

430945, 369284, G11B 724, G11B 726

Patent

active

054533465

ABSTRACT:
In a phase change optical disk wherein a first heat-resistant protection layer, an optical active layer showing a reversible phase change between a crystal state and an amorphous state, and a second heat-resistant protection layer are laminated on a substrate in this order, both of the first and the second heat-resistant protection layers are made of a mixture of a chalcogenide and a vitrification accelerating material. Further, a mixture ratio of the vitrification accelerating material in the second heat-resistant protection layer is larger than that in the first heat-resistant protection layer. Thereby, it becomes possible that the first heat-resistant protection layer has the mixing ratio which gives the refractive index value bringing suitable optical properties, while the second heat-resistant protection layer has the different mixing ratio which gives the thermal conductivity bringing suitable thermal properties. As a result, a phase change optical disk having high sensitivity, improved life characteristics in repeated record/erasure operations and wide production margin is provided.

REFERENCES:
patent: 4847132 (1989-07-01), Takao et al.
patent: 5098761 (1992-03-01), Watanabe et al.
patent: 5191565 (1993-03-01), Inoue et al.
patent: 5194363 (1993-03-01), Yoshioka

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