Read/write optical memory
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United States of America Patent
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Jan 12, 1993
Grant Date -
N/A
app pub date -
Jul 31, 1989
filing date -
Jul 31, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved read/write optical disk is disclosed which is capable of being rewritten more than 10.sup.6 times. The disk utilizes a storage medium in which data is stored by causing a localized region of the storage medium to assume one of two states. The two states can be converted from one to another by the application of electric fields to the localized region of the storage medium. The localized region in question is selected by illuminating an area on an addressing layer directly above the region in question with light. The preferred embodiment utilizes a lead lanthanum zirconate titanate material for the storage medium.
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