Projection screens and the like

THIS INVENTION relates to a material suitable for use as a light diffusing screen or rear projection screen and to a material suitable for use as a front projection screen and for analogous purposes, such as in reflective signs, etc. A light diffusing screen is made by exposing a photopolymerisable...

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Main Authors Clabburn, Robin, Phillips, Nicholas John, Yeo, Terence Edward, Batchelder, Lee
Format Patent
LanguageEnglish
Published 25.02.2003
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Abstract THIS INVENTION relates to a material suitable for use as a light diffusing screen or rear projection screen and to a material suitable for use as a front projection screen and for analogous purposes, such as in reflective signs, etc. A light diffusing screen is made by exposing a photopolymerisable material to polymerising light through a mask having an array of light-transmitting apertures in an opaque background or vice versa, at least some of the light being directed obliquely onto the photopolymerisable material. The resulting photopolymerised material has asymmetric light diffusing properties. In some embodiments two beams of light directed onto the photopolymerisable material are equally and oppositely inclined to the perpendicular to the plane of the material. An analogous effect may be provided, in other embodiments, by exposing the photopolymerisable material to light converging conically on the photopolymerisable material.
AbstractList THIS INVENTION relates to a material suitable for use as a light diffusing screen or rear projection screen and to a material suitable for use as a front projection screen and for analogous purposes, such as in reflective signs, etc. A light diffusing screen is made by exposing a photopolymerisable material to polymerising light through a mask having an array of light-transmitting apertures in an opaque background or vice versa, at least some of the light being directed obliquely onto the photopolymerisable material. The resulting photopolymerised material has asymmetric light diffusing properties. In some embodiments two beams of light directed onto the photopolymerisable material are equally and oppositely inclined to the perpendicular to the plane of the material. An analogous effect may be provided, in other embodiments, by exposing the photopolymerisable material to light converging conically on the photopolymerisable material.
Author Batchelder, Lee
Clabburn, Robin
Phillips, Nicholas John
Yeo, Terence Edward
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References Jannson et al. (5365354) 19941100
Amos (5369511) 19941100
Langille et al. (5837346) 19981100
van de Ven (4721361) 19880100
Nelson (4755921) 19880700
Johnson (5442482) 19950800
(0294122) 19881200
Johnson et al. (5695895) 19971200
Johnson (5719588) 19980200
Sawaki et al. (5648874) 19970700
Beeson et al. (5696865) 19971200
(9429768) 19941200
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