Information writing method for an optical disc memory system uti

Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam

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369110, 365108, 365117, G11B 1114, G11C 1304

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active

048559768

ABSTRACT:
An improved magneto-optical disc memory writing and reading method with a ferroelectric liquid crystal (FLC) is shown. As FLC a chiral smectic liquid crystal is employed to exhibit a hysteresis between a pair of substrates which have easy polarization axes normal to each other. Informations to be recorded are written on the disc in terms of a binary system by use of the hysteresis.

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Mol. Cryst. Liq. Cryst., vol. 94, 1983, N. A. Clark et al., "Ferroelectric Liquid Crystal Electro-Optics Using the Surface Stabilized Structure", pp. 213-234.
"Erasable Optical Liquid Crystal Disc Memory", H. Birecki, S. Naberhuis, F. J. Kahn, SPIE 420,194 (1983).

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