Static information storage and retrieval – Information masking – Transparency
Patent
1984-04-12
1986-04-29
Fears, Terrell W.
Static information storage and retrieval
Information masking
Transparency
365157, G11C 1142, G11C 1304
Patent
active
045861641
ABSTRACT:
A random access memory device is disclosed which utilizes phase change materials. The memory device includes two overlapping films of a phase change material which exhibits an optically discernible phase change at any portion thereof which is subjected to a selected external stimulus and which exhibits a hysteresis effect such that any such portion is substantially unchanged after the external stimulus is removed. Various phase change materials are disclosed which respond to changes in pressure, temperature or electric field intensities to vary the transmission characteristics of a selected portion of a film of such material from substantially opaque to translucent. One of the two overlapping films is then utilized to record digital data by changing the phase of the material at selected portions thereof. A single selected portion of the second film is then rendered translucent and utilized in conjunction with a powerful light source and a photodetector to ascertain the phase of a particular portion of the first film which underlies the single selected portion of the second film.
REFERENCES:
patent: 4090031 (1978-05-01), Russell
Cate J. M.
Fears Terrell W.
LTV Aerospace and Defense Company
Sadacca Stephen S.
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