Patent US5699413A successfully refreshed from Google Patents.
Patent US5039208A successfully refreshed from Google Patents.
US5039208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer liquid crystal device
Assignee: Canon Inc
•
Filing: 1990-11-01
•
Granted: 1991-08-13
•
Expires: 2010-11-01
Abstract
Abstract A crosslinked polymer liquid crystal is stretched to provide a polymer liquid crystal layer with a higher degree of uniform alignment than a non-crosslinked polymer liquid crystal. Such a stretched layer of crosslinked polymer liquid crystal is disposed between a pair of substrates to form a liquid crystal device showing a better contrast as a recording medium or display device. The improvement in alignment obtained by stretching of a crosslinked polymer liquid crystal is also effective in increasing the responsive characteristics in response to an electric field or magnetic field and also the pyro-electric effect of the resultant polymer liquid crystal layer where the polymer liquid crystal is a ferro-electric one.
Inventors
- 👤 Toshikazu Ohnishi
- 👤 Kazuo Yoshinaga
- 👤 Takeshi Miyazaki
- 👤 Yutaka Kurabayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:04
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/38; C09K19/3833; C09K19/3842; C09K19/3852; C09K19/3857; C09K19/3804; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/133365
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
32 words
An optical modulation device, comprising an aligned stretched layer, said layer being a stretched ferroelectric polymer liquid crystal having chiral smectic phase, said ferroelectric polymer liquid crystal comprising crosslinked polymer main chains.
Claim 2
Dependent Claim
32 words
An optical modulation device, comprising an aligned stretched layer, said layer being a stretched ferroelectric polymer liquid crystal having chiral smectic phase, said ferroelectric polymer liquid crystal comprising crosslinked polymer main chains.
Claim 3
Dependent Claim
19 words
A device according to claim 1, wherein said aligned stretched layer is disposed between a pair of polyester layers.
Claim 4
Dependent Claim
24 words
A device according to claim 1, wherein said stretching is effected at or above the glass transition temperature of the ferroelectric polymer liquid crystal.
Claim 5
Dependent Claim
27 words
A device according to claim 3, wherein said stretching is effected in a temperature range where the ferroelectric polymer liquid crystal is in a liquid crystal phase.
Claim 6
Dependent Claim
39 words
A device according to claim 1, wherein the aligned stretched layer has been obtained by pre-stretching a non-crosslinked ferroelectric polymer liquid crystal, crosslinking the prestretched ferroelectric polymer liquid crystal and then further stretching the crosslinked ferroelectric polymer liquid crystal.
Claim 7
Dependent Claim
31 words
A device according to claim 1, wherein the aligned stretched layer has been obtained by stretching a crosslinked ferroelectric polymer liquid crystal comprising polymer main chains crosslinked with a covalent bond.
Claim 8
Dependent Claim
27 words
A device according to claim 6, wherein said stretching is effected in a temperature range where the ferroelectric polymer liquid crystal is in a liquid crystal phase.
Claim 9
Dependent Claim
27 words
A device according to claim 6, wherein said cross-linked ferroelectric polymer liquid crystal has been obtained by reacting a crosslinking agent with a ferroelectric polymer liquid crystal.
Claim 10
Dependent Claim
31 words
A device according to claim 1, wherein the aligned stretched layer has been obtained by stretching a crosslinked ferroelectric polymer liquid crystal comprising polymer main chains crosslinked with a non-covalent bond.
Claim 11
Dependent Claim
17 words
A device according to claim 9, wherein said non-covalent bond is an ionic bond or hydrogen bond.
Claim 12
Dependent Claim
26 words
A device according to claim 10, wherein said ionic bond or hydrogen bond is obtained by reacting a ferroelectric polymer liquid crystal with a crosslinking agent.
Claim 13
Dependent Claim
22 words
A device according to claim 9, wherein said crosslinked ferroelectric polymer liquid crystal has been obtained by crosslinking with a block polymer.
Claim 14
Dependent Claim
23 words
A device according to claim 9, wherein said crosslinked ferroelectric polymer liquid crystal has been formed by addition of carbon black or silica.
Claim 15
Dependent Claim
20 words
A device according to claim 9, wherein said ferroelectric polymer liquid crystal features crosslinking by entanglement of polymer main chains.
Claim 16
Dependent Claim
26 words
A device according to claim 2, wherein said stretching is co-stretching applied to a laminate of said crosslinked ferroelectric polymer liquid crystal and a plastic substrate.
Claim 17
Dependent Claim
25 words
A device according to claim 15, wherein said laminate is formed by applying the ferroelectric polymer liquid crystal onto the plastic substrate by blade coating.
Claim 18
Dependent Claim
12 words
A device according to claim 1, wherein said stretching is uniaxial stretching.
Claim 19
Dependent Claim
15 words
A device according to claim 1, wherein said stretching comprises successive or simultaneous biaxial stretching.
Claim 20
Dependent Claim
20 words
A device according to claim 1, wherein said stretching is effected under application of an electric field or magnetic field.
Claim 21
Dependent Claim
22 words
A device according to claim 1, wherein said aligned stretched layer has a pyroelectric constant of 1 μC/mm 2 .K or higher.
Claim 22
Dependent Claim
28 words
An optical modulation device according to claim 1, wherein said aligned stretched layer is disposed between a pair of substrates each having thereon a plurality of stripe electrodes.
Claim 23
Dependent Claim
26 words
A recording apparatus, comprising: an optical modulation device according to claim 11, and a laser light source for supplying a laser light signal to the device.
Claim 24
Dependent Claim
16 words
A recording apparatus according to claim 22, wherein said laser light source comprises a semiconductor laser.
Claim 25
Dependent Claim
34 words
A display apparatus, comprising: an optical modulation device according to claim 1, an optical modulation device according to claim 1, a means for heating the device, and a light source for illuminating the device.
Claim 26
Dependent Claim
35 words
A display apparatus, comprising: an optical modulation device according to claim 21, a means for applying a voltage to the device, a means for heating the device, and a light source for illuminating the device.
Claim 27
Dependent Claim
33 words
A display apparatus, comprising: an optical modulation device according to claim 21, a means for generating a magnetic field, a means for heating the device, and a light source for illuminating the device.
References Cited (Backward Citations)
US4388453A
Cited
US4702558A
Cited
US4624872A
Cited
GB2166685A
Cited
US4844835A
Cited
EP0293911A2
Cited
US4946261A
Cited
US4963402A
Cited
US4981614A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-12 | 1995-02-11 | 1995-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-12 | 1999-02-11 | 1999-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-12 | 2003-02-11 | 2003-08-13 | $7700.00 | Window Closed / Lapsed |