Patent EP0421810A2 successfully refreshed from Google Patents.
EP0421810A2
Expired / Lapsed
EP
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A directional reflector
Assignee: EMI Group Ltd
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Filing: 1990-10-05
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Granted: —
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Expires: 2010-10-05
Abstract
Abstract A directional reflector includes a faceted sheet of refracting material and a layer of optically absorbing material separated from the refracting material by a substance whose raefractive index is lower than that of the refracting material. This enables either absorption or reflection of incident light, depending upon the angle of incidence.
Inventors
- 👤 Simon Nicholas Rainey
- 👤 Ian Alexander Shanks
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 13:11
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/12; G02B5/122; G02B5/124; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133553
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
59 words
A directional reflector comprising a sheet of refracting material having a first face and a second face, said first face comprising a plurality of facets, the reflector further comprising an absorbing layer adjacent and separated from one of said first and second faces by a substance having a refractive index lower than the refractive index of the refracting material.
Claim 2
Dependent Claim
59 words
A directional reflector comprising a sheet of refracting material having a first face and a second face, said first face comprising a plurality of facets, the reflector further comprising an absorbing layer adjacent and separated from one of said first and second faces by a substance having a refractive index lower than the refractive index of the refracting material.
Claim 3
Dependent Claim
21 words
A reflector according to Claim 1 wherein the plurality of facets are provided by a plurality of parallel and uniform prisms.
Claim 4
Dependent Claim
22 words
A reflector according to Claims 1 or 2 wherein each facet is at an angle to the normal to said second face.
Claim 5
Dependent Claim
19 words
A reflector according to any one of the preceding claims wherein the absorbing layer is adjacent said second face.
Claim 6
Dependent Claim
19 words
A reflector according to Claim 4 further comprising means for enhancing the reflectivity into the sheet of alternate facets.
Claim 7
Dependent Claim
21 words
A reflector according to Claim 5 further comprising an absorbing layer on the outer surface of each of the reflecting means.
Claim 8
Dependent Claim
25 words
A reflector according to any one of Claims 1 to 3 wherein the absorbing layer is adjacent and follows the contour of said first face.
Claim 9
Dependent Claim
20 words
A directional reflector substantially as hereinbefore described with reference to and as illustrated in any one of the accompanying drawings.
Claim 10
Dependent Claim
20 words
A directional reflector substantially as hereinbefore described with reference to and as illustrated in any one of the accompanying drawings.
Claim 11
Dependent Claim
37 words
A screen comprising a directional reflector according to any one of the preceding claims and a layer of liquid crystal material, the liquid crystal layer being adjacent the opposite face of said sheet from the absorbing layer.
Claim 12
Dependent Claim
37 words
A display comprising a directional reflector according to any one of the preceding claims and a matrix of liquid crystal pixels, the liquid crystal pixels being adjacent the opposite face of said sheet from the absorbing layer.
References Cited (Backward Citations)
No citation records indexed.
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