Patent US2884702A successfully refreshed from Google Patents.
Patent EP0407830B1 successfully refreshed from Google Patents.
EP0407830B1
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EP
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Polarizer
Assignee: Rolic Technologies Ltd
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Filing: 1990-06-29
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Granted: 1996-09-25
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Expires: 2010-06-29
Abstract
No abstract record available.
Inventors
- 👤 Mikhail Ivanovich Dr. Barnik
- 👤 Sergey Vasilievich Dr. Belyaev
- 👤 Jürg Dr. Fünfschilling
- 👤 Nikolai Malimonenko
- 👤 Martin Dr. Schadt
- 👤 Klaus Dr. Schmitt
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 12:34
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/13362; C; C09; C09K; C09K19/00; C09K19/02; C09K19/52; C09K19/58; G02B; G02B5/00; G02B5/30; G02B5/3016; G02F1/0009; G02F1/0063; G02F1/133382; G02F1/137; G02F1/139; G02F1/1396; H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3141; H04N9/315; H04N9/3167; G02F1/133528; G02F1/133536; G02F1/133543
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
115 words
A polarizer for producing circular-polarized light from non-polarized light with a layer (1) of a cholesteric liquid crystal having a Grandjean structure disposed in the path of the rays of the light, and a mirror (2) for reversing the direction of rotation of circular-polarized light opposite the incident light side of the liquid crystal layer in the path of the rays of the light reflected by the liquid crystal layer, characterised in that the mirror has an aperture (3) and in that the light source is disposed on that side of the mirror which is remote from the liquid crystal layer so that the light is incident on the liquid crystal layer through the aperture.
Claim 2
Dependent Claim
29 words
A polarizer according to claim 1, characterised in that an artificial light source is disposed on that side of the mirror which is remote from the liquid crystal layer.
Claim 3
Dependent Claim
25 words
A polarizer according to claim 1 or 2, characterised in that a plurality of liquid crystal layers (1) having different spectral selectivity are disposed consecutively.
Claim 4
Dependent Claim
24 words
A polarizer according to any one of claims 1 to 3, characterised in that a λ/4 plate is disposed after the liquid crystal layer.
Claim 5
Dependent Claim
100 words
A polarizer for producing a plurality of separate rays of circular-polarized light having different directions of rotation or different spectral composition from non-polarized incident light, characterised by at least two layers (29, 30; 48 - 53) of cholesteric liquid crystals having a Grandjean structure disposed consecutively in the path of the rays of the incident light (33) at an angle of 45° to said rays, and a mirror (32, 37, 54, 55) parallel to the incident light and disposed on the incident light side in the path of the rays of the light reflected at the cholesteric liquid crystal layer.
Claim 6
Dependent Claim
44 words
A polarizer according to claim 5, characterised in that the liquid crystal layers are defined on both sides by the flat surfaces of three-sided or four-sided prisms (26 - 28; 36, 41 - 46; 63 - 66) having angles of 45° at the apex.
Claim 7
Dependent Claim
73 words
Apparatus for producing polarized light, characterised by an artificial light source (12) for producing non-polarized light, a spherical layer (13) of a cholesteric liquid crystal having a Grandjean structure disposed concentrically to the light source, a spherical mirror (15) concentric to the light source and reversing the direction of rotation of an incident circular-polarized ray of light, said mirror (15) being situated opposite the liquid crystal layer with respect to the light source.
Claim 8
Dependent Claim
24 words
Apparatus according to claim 7, characterised in that the liquid crystal layer (13) comprises a plurality of cholesteric layers having different spectral selectivity consecutively.
Claim 9
Dependent Claim
18 words
Apparatus according to claim 7, characterised in that a λ4 plate is disposed after the liquid crystal layer.
Claim 10
Dependent Claim
59 words
A projection system characterised by a first polarizer according to any one of claims 1, 5 and 7, a second polarizer arranged as an analyser, according to any one of claims 1, 5 and 7, and a liquid crystal display cell (91 - 93) disposed between the first and second polarizers for modulating the intensity of the polarized light.
References Cited (Backward Citations)
No citation records indexed.
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