Static information storage and retrieval – Radiant energy – Liquid crystal
Patent
1981-05-26
1983-08-02
Hecker, Stuart M.
Static information storage and retrieval
Radiant energy
Liquid crystal
340784, 350351, G11C 1308
Patent
active
043969976
ABSTRACT:
An optical erasable thermally addressed, liquid crystal information storage and retrieval system is disclosed having an information density and the order of 10.sup.7 bits/cm.sup.2 while using liquid crystal cell thickness of relatively standard dimensions (.about.10 .mu.m). The system includes two substrates containing a smectic-A phase liquid crystal medium, and several thin filing attached to the substrates for establishing the proper conditions within the liquid crystal medium for creating a radiation scattering defect which is small in size (<1.0 .mu.m), and for performing erase functions in conjunction with an optical beam. A device according to the invention has an array of such defects in the liquid crystal medium representing information bits, with the array having a ratio of the shortest distance between individual defects to the thickness of the liquid crystal medium of less than 0.4, for a liquid crystal medium having thickness larger than 5 microns.
REFERENCES:
patent: 3775757 (1973-11-01), Taylor et al.
patent: 3796999 (1974-03-01), Kahn
patent: 4040047 (1977-08-01), Hareng et al.
Bleha et al., AC-Driven Photoactivated Liquid Crystal Light Valve, Conf:S4386 0060 1973 SID International Symposium Digest of Tech. Papers, N.Y., 5/15-17/73, pp. 42-43.
Melchior et al., Thermally Addressed Electrically Evased High-resolution Liquid-Crystal Light Valves, Appl. Phys. Lett. vol. 21, No. 8, 10/15/72, pp. 392-394, S28230057.
Cunningham et al. Absorbing Films for Reflective Laser Addressed, Thermally Activated Liquid Crystal Cell, IBM Tech. Disc. Bul., vol. 18, No. 11, 4/76, p. 3776.
Birecki Henryk
Burmeister Robert A.
Kahn Frederic J.
Grubman Ronald E.
Hecker Stuart M.
Hewlett--Packard Company
Smith Joseph H.
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