Dynamic information storage or retrieval – Storage medium structure – Adjuncts or adapters
Patent
1990-11-28
1994-12-06
Dzierzynski, Paul M.
Dynamic information storage or retrieval
Storage medium structure
Adjuncts or adapters
360133, G11B 2303
Patent
active
053717309
ABSTRACT:
The invention relates to an optical memory in which an optical recording medium is built in a case, and also to a memory apparatus. Recording, reproducing and erasing operations are performed by irradiating light via a transparent portion of the case onto the built-in optical recording medium. The optical recording medium built in the case has face vibrations with respect to the case, because it is moved within the case. The present invention is characterized by employing such a construction for optically mitigating irregular fluctuation in reflectivity caused by this face vibration. In the optical memory of the present invention, the reflectivity fluctuation caused by an interference effect made between reflection light from the case and air, and also reflection light from the optical recording medium and air due to the relative deviation in the face vibrations, may be reduced by antireflection films provided in the case and the optical recording medium. In a memory apparatus of the present invention, the abovedescribed memory is mounted, the fluctuation in the reflectivity is monitored and laser power is varied in order to further mitigate the reflection vibrations.
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Andoh Hisashi
Ikuta Isao
Katou Yoshimi
Maeda Yoshihito
Minemura Hiroyuki
Dzierzynski Paul M.
Hitachi , Ltd.
Nguyen Kiet T.
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