US3832033A
Expired / Lapsed
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Regular ferroelectrics-liquid crystal composite optical element
Assignee: Hitachi Ltd
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Filing: 1972-12-18
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Granted: 1974-08-27
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Expires: 1992-12-18
Abstract
Abstract This invention relates to a regular ferroelectric-liquid crystal composite optical element characterized in that a film of a cholesteric liquid crystal or a nematic liquid crystal with negative dielectric anisotropy is interposedly provided on the surface of a regular ferroelectric single crystal substrate.
Inventors
- 👤 Y Furuhata
- 👤 K Toriyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:06
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/135; G02F1/1358; G11; G11C; G11C13/00; G11C13/04; G11C13/047; H; H01; H01G; H01G7/00; H01G7/02
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
37 words
A device according to claim 1, wherein said liquid medium is a liquid crystal made of at least one member selected from the group consisting of cholesteric liquid crystals, and nematic liquid crystals having negative dielectric anisotropy.
Claim 2
Dependent Claim
24 words
A device according to claim 2, wherein said first means comprises a pair of transparent electrodes between which a prescribed electric field is applied.
Claim 3
Dependent Claim
21 words
A device according to claim 3, wherein said third means includes respective polarizers disposed adjacent opposite sides of said storage element.
Claim 4
Dependent Claim
38 words
A device according to claim 2, wherein said regular ferroelectric single crystal substrate is made of a member selected from the group consisting of barium titanate, lithium niobate, guanidinium aluminum sulfate hexahydrate, tri-glycine sulfate, and lithium hydrogen selenite.
Claim 5
Independent Claim
104 words
A device for optically storing information comprising: a storage element having a regular ferroelectric single crystal substrate; a liquid crystal medium disposed in contact with one surface of said substrate; a photoconductive film disposed in contact with The other surface of said substrate; first means, disposed on said liquid crystal medium and said photoconductive film, for applying a D.C. voltage therebetween through said substrate; and a pair of transparent plates disposed adjacent said first means; second means for directing a beam of light, containing information to be stored onto said storage element; and third means for applying a D.C. voltage to said first means.
Claim 6
Dependent Claim
37 words
A device according to claim 6, wherein said liquid medium is a liquid crystal made of at least one member selected from the group consisting of cholesteric liquid crystals, and nematic liquid crystals having negative dielectric anisotropy.
Claim 7
Dependent Claim
24 words
A device according to claim 7, wherein said first means comprises a pair of transparent electrodes between which a prescribed electric field is applied.
Claim 8
Dependent Claim
38 words
A device according to claim 6, wherein said regular ferroelectric single crystal substrate is made of a member selected from the group consisting of barium titanate, lithium niobate, guanidinium aluminum sulfate hexahydrate, tri-glycine sulfate, and lithium hydrogen selenite.
Claim 9
Dependent Claim
128 words
A composite optical element comprising: a regular ferroelectric single crystal substrate which has a first transparent electrode on one surface thereof; a second transparent electrode which is disposed in proximity to said substrate on the side thereof opposite to the side on which said substrate has said first transparent electrode; and a liquid crystal film which is held between said substrate and said second transparent electrode and in contact with said substrate; said liquid crystal film being made of at least one member selected from the group consisting of cholesteric liquid crystals, and nematic liquid crystals with negative dielectric anistropy, said first and second transparent electrodes being applied with a D.C. voltage in order to control the direction of the spontaneous polarization of said regular ferroelectric single crystal.
Claim 10
Dependent Claim
40 words
A composite optical element according to claim 10, wherein said regular ferroelectric single crystal substrate is made of a member selected from the group consisting of barium titanate, lithium niobate, guanidinium aluminum sulfate hexahydrate, tri-glycine sulfate, and lithium hydrogen selenite.
Claim 11
Dependent Claim
78 words
A composite optical element according to claim 10, wherein a first transparent plate is disposed in contact with said first transparent electrode on the side thereof opposite to the side on which said first transparent electrode is in contact with said substrate, and a second transparent plate is disposed in contact with said second transparent electrode on the side thereof opposite to the side on which said second transparent electrode is in contact with said liquid crystal film.
Claim 12
Dependent Claim
40 words
A composite optical element according to claim 12, wherein said regular ferroelectric single crystal substrate is made of a member selected from the group consisting of barium titanate, lithium niobate, guanidinium aluminum sulfate hexahydrate, tri-glycine sulfate, and lithium hydrogen selenite.
Claim 13
Dependent Claim
161 words
A composite optical element comprising: a transparent photoconductor film which has a first transparent electrode on one surface thereof; a regular ferroelectric single crystal substrate which is disposed in contact with said photoconductor film on the side thereof opposite to the side on which said photoconductor film has said first transparent electrode; a second transparent electrode which is disposed in proximity to said substrate on the side thereof opposite to the side on which said substrate is in contact with said photoconductor film; and a liquid crystal film which is held between said substrate and said second transparent electrode and in contact with said substrate; said liquid crystal film being made of at least one member selected from the group consisting of cholesteric liquid crystals, and nematic liquid crystals with negative dielectric anisotropy; said firSt and second transparent electrodes being applied with a D.C. voltage in order to control the direction of the spontaneous polarization of said regular ferroelectric single crystal.
Claim 14
Dependent Claim
40 words
A composite optical element according to claim 14, wherein said regular ferroelectric single crystal substrate is made of a member selected from the group consisting of barium titanate, lithium niobate, guanidinium aluminum sulfate hexahydrate, tri-glycine sulfate, and lithium hydrogen selenite.
Claim 15
Dependent Claim
77 words
A composite optical element according to claim 14, wherein a first transparent plate is disposed in contact with said first transparent electrode on the side opposite to the side on which said first transparent electrode is in contact with said photoconductor film, and a second transparent plate is disposed in contact with said second transparent electrode on the side opposite to the side on which said second transparent electrode is in contact with said liquid crystal film.
Claim 16
Dependent Claim
40 words
A composite optical element according to claim 16, wherein said regular ferroelectric single crystal substrate is made of a member selected from the group consisting of barium titanate, lithium niobate, guanidinium aluminum sulfate hexahydrate, tri-glycine sulfate, and lithium hydrogen selenite.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |