Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1989-06-07
1992-04-21
Envall, Jr., Roy N.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
3692752, 369116, G11B 700
Patent
active
051074826
ABSTRACT:
A method and apparatus for optically recording information in which the phase state of each recording position of the recording film of a recording medium such as an optical disk is reversibly changed between an amorphous phase and a crystalline phase using a single laser beam, thereby optically recording information on the the recording film. The recording position on the recording film is heated to the melting point thereof or more through laser beam irradiation irrespective of the information to be recorded. After completion of the heating, in order to change the phase state of the recording film at the recording position in accordance with the information, the power and/or irradiation time of the laser beam is controlled so as to provide different times required for the temperature of the recording position to pass through the crystallization temperature region of the recording film. The recording medium has at least one record of data indicative of the melting point of the recording film and data indicative of the time required to pass through the crystallization temperature region for placing the recording position in the amorphous state or crystalline state.
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Jamberdino, "Optical Storage Media" Jun. 1983 from SPIE The International Society for Optical Engineering.
Fukui Yukio
Goto Norio
Ishigaki Masaji
Envall Jr. Roy N.
Hitachi , Ltd.
Tran Thang V.
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