Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1987-05-06
1989-08-22
McElheny, Jr., Donald
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369275, G11B 724, G11B 726
Patent
active
048602744
ABSTRACT:
A first protective layer of SiO.sub.2 is formed on a polycarbonate substrate, an In-Sb alloy recording layer containing 50 to 80 atomic % of Sb is formed on the first protective layer, a second protective layer of SiO.sub.2 is formed on the recording layer, and a surface layer of an ultraviolet-curing resin is formed on the second protective layer to prepare an optical disk. In order to initialize the optical disk, the recording layer is entirely exposed to a laser beam and is transformed into a stable phase crystalline state. In order to record information in the optical disk, the recording layer is locally exposed to a laser beam and site exposed to the beam is melted. The applied site is then rapidly cooled to transform the phase into the metastable phase crystalline state, i.e., .pi.-phase. In order to erase information from the disk, the recording mark is exposed to a laser beam and heated to a temperature higher than a temperature of phase transformation between the stable and metastable phase crystalline states but lower than the melting point of the alloy.
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Kabushiki Kaisha Toshiba
McElheny Jr. Donald
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