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Title:
LIGHT-MODIFYING AND OTHER STRUCTURES USING DICHROMATED GELATINE AND OTHER MATERIALS, AND METHODS OF MAKING SUCH STRUCTURES
Document Type and Number:
WIPO Patent Application WO1999050717
Kind Code:
A3
Abstract:
The invention relates to various structures utilising dichromated gelatine (DCG) or analogous materials and includes improved techniques for processing DCG to produce light-modifying structures and/or products having an open-celled or porous structure. Applications include a collimating, lens-like light diffuser, improved LCD displays utilising DCG or another transparent porous material permeated by a liquid crystal medium, a reflector comprising a thin layer of DCG on a substrate and also a non-optical product comprising a magnetic recording medium, such as a magnetic disk having a coating of a porous open-celled medium, preferably DCG, in which the pores are filled with a ferro-fluid.

Inventors:
JOHNSON WILLIAM NEVIL HEATON (GB)
PHILLIPS NICHOLAS JOHN (GB)
MURRAY BRUCE LAWRENCE JOHN (GB)
BIGG GEOFFREY (GB)
Application Number:
PCT/GB1999/000958
Publication Date:
December 16, 1999
Filing Date:
March 26, 1999
Export Citation:
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Assignee:
DURAND LTD (GB)
JOHNSON WILLIAM N H (GB)
PHILLIPS NICHOLAS JOHN (GB)
MURRAY BRUCE LAWRENCE JOHN (GB)
BIGG GEOFFREY (GB)
International Classes:
G03C1/66; G03H1/02; G02F1/1334; G02F1/1339; (IPC1-7): G03H1/02; G02B5/32; G03C1/66; G03H1/18
Foreign References:
US4799746A1989-01-24
EP0472964A21992-03-04
US4966440A1990-10-30
US4187106A1980-02-05
Other References:
ENDO A ET AL: "Relationship between molecular weight and exposure characteristics of dichromated gelatin (DCG)", JOURNAL OF THE SOCIETY OF PHOTOGRAPHIC SCIENCE AND TECHNOLOGY OF JAPAN, OCT. 1984, JAPAN, vol. 47, no. 5, ISSN 0369-5662, pages 329 - 334, XP002108213
TEDESCO J M: "HOLOGRAPHIC DIFFUSERS FOR LCD COCKPIT DISPLAYS", PROCEEDINGS OF THE SPIE, vol. 2219, 1 January 1994 (1994-01-01), pages 327 - 337, XP000569218
L. SOLYMAR, D.J. COOKE: "Volume Holography and Volume Gratings", 1981, ACADEMIC PRESS, LONDON, XP002108214
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