US4615586A
Expired / Lapsed
US
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Liquid crystal devices
Assignee: Nokia Bell Labs
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Filing: 1985-04-26
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Granted: 1986-10-07
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Expires: 2005-04-26
Abstract
Abstract Liquid crystal devices having excellent speed are produced by utilizing an appropriate liquid crystal mixture. This mixture is prepared by selecting liquid crystal materials having opposite pitch and having specifically chosen spontaneous polarizations.
Inventors
- 👤 John M. Geary
- 👤 John W. Goodby
- 👤 Thomas M. Leslie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:08
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/139; G02F1/141; C; C09; C09K; C09K19/00; C09K19/02; C09K19/0225
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
109 words
A device for affecting incident electromagnetic radiation comprising a ferroelectric liquid crystal material, means for constraining said ferroelectric liquid crystal material to establish a device thickness and means for producing an electric field CHARACTERIZED IN THAT said ferroelectric liquid crystal material is stable and comprises at least two components wherein at least one of said components has the opposite twist sense from a second of said components, whereby the pitch of said ferroelectric liquid crystal material is greater than 50 percent of said device thickness and wherein components are chosen so that the spontaneous polarization of said ferroelectric liquid crystal material is greater than 0.2×10 -8 coul/cm 2 .
Claim 2
Independent Claim
109 words
A device for affecting incident electromagnetic radiation comprising a ferroelectric liquid crystal material, means for constraining said ferroelectric liquid crystal material to establish a device thickness and means for producing an electric field CHARACTERIZED IN THAT said ferroelectric liquid crystal material is stable and comprises at least two components wherein at least one of said components has the opposite twist sense from a second of said components, whereby the pitch of said ferroelectric liquid crystal material is greater than 50 percent of said device thickness and wherein components are chosen so that the spontaneous polarization of said ferroelectric liquid crystal material is greater than 0.2×10 -8 coul/cm 2 .
Claim 3
Dependent Claim
13 words
The device of claim 1 wherein said pitch is at least 20 μm.
Claim 4
Dependent Claim
16 words
The device of claim 1 wherein said means for applying an electric field comprises two electrodes.
Claim 5
Dependent Claim
23 words
The device of claim 1 wherein at least one of said components has an optical tilt direction greater than the X-ray tilt direction.
Claim 6
Dependent Claim
23 words
The device of claim 1 wherein at least one of said components has an optical tilt direction less than the X-ray tilt direction.
Claim 7
Dependent Claim
14 words
The device of claim 1 wherein said components are all in the trans conformation.
Claim 8
Dependent Claim
21 words
The device of claim 1 wherein the spontaneous polarization of at least two of said components is in the same sense.
References Cited (Backward Citations)
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US4083797A
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US4257911A
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US4219255A
Cited
US4405208A
Cited
US4526704A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-06 | 1990-04-07 | 1990-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-06 | 1994-04-07 | 1994-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-06 | 1998-04-07 | 1998-10-07 | $7700.00 | Window Closed / Lapsed |