Apparatus for the reversible, optical storage of data

Details Apparatus for the reversible, optical storage of data Apparatus for the reversible, optical storage of data

1988-10-26

1990-01-23

Fears, Terrell W.

Static information storage and retrieval

Radiant energy

Liquid crystal

365106, 365107, 350352, G11C 1302, G11C 1304

Patent

active

048962929

ABSTRACT:
The invention relates to an apparatus for reversible optical data storage using polymeric liquid crystals with mesogenic side groups as a storage medium, arranged to store information by means of selective variation of the order of the polymeric liquid crystals be means of a heat source. The macroscopically oriented film made from the liquid crystal polymer is held in the solid form retaining condition of the liquid crystal polymer in the temperature range below the glass temperature T.sub.g >T.sub.a (room remperature) for the purpose of storing the information. The polymer is then selectively and locally heated by means of the heat source into the isotropic liquid condition and the local information is fixed in the glass condition of the polymer after the heat source is turned off.

REFERENCES:
patent: 2978437 (1961-04-01), Christenson
patent: 4293435 (1981-10-01), Portugall et al.
patent: 4325739 (1982-04-01), Biermann et al.
patent: 4702558 (1987-10-01), Coles et al.
patent: 4702945 (1987-10-01), Etzbach et al.

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