Optical component

Details Optical component Optical component

1996-09-26

2000-11-07

Dudek, James A.

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

G02F 11335

Patent

active

061444286

ABSTRACT:
By combination of a hybrid layer formed from an orienting layer and a layer of a cross-linked liquid crystalline monomer with a reflector, and by appropriate local structuring of the molecule orientation, an optical pattern is obtained which cannot be copied using conventional photocopiers. This pattern is useful as means for protecting documents, such as banknotes, credit cards, and the like, from being copied, and can be detected by manually or automatically, operated optical reading devices.

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patent: 5210630 (1993-05-01), Heynderrickx et al.
patent: 5220444 (1993-06-01), Mitsui et al.
patent: 5331448 (1994-07-01), Kajiyama et al.
patent: 5550658 (1996-08-01), Yoshihiro
Derwent Abstract No. AN-91-231516/32
Derwent Abstract No. AN-94-265517/33
Research Disclosure No. 337, Emsworth, GB, pp. 410-411 (May 1992).
Patent Abstracts of Japan, vol. 15(318) (M-1146) (JP 3-118199) (Aug. 1991).

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