Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1987-12-30
1988-09-20
Cardillo, Raymond F.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369288, 369108, 3461351, 365119, G11B 724, G11B 700
Patent
active
047730595
ABSTRACT:
An information recording and reproducing apparatus is disclosed, which makes use a recording medium made of a metal or alloy having phases different in their crystalline structures at at least two temperature regions in the solid state and capable of causing phase transformation by heating and quenching. Information such as signals, letters, patterns and symbols are recorded in a distinctive manner and erased by making use of a change in the spectral reflectance owing to the phase transformation. Rewriting can be made easily by making use of the energy of a light beam such as a laser beam.
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Andoh Hisashi
Ikuta Isao
Kita Yoshiaki
Minemura Tetsuro
Cardillo Raymond F.
Hitachi , Ltd.
Weinhardt Robert A.
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