Patent US3421186A successfully refreshed from Google Patents.
Patent US4848878A successfully refreshed from Google Patents.
US4848878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-glaring rearview mirror with liquid crystal mixture
Assignee: Samsung SDI Co Ltd
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Filing: 1988-01-11
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Granted: 1989-07-18
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Expires: 2008-01-11
Abstract
Abstract There is disclosed a rearview mirror absorbing the light when the orientation of the liquid crystal is caused to change. A suitable amount of cholesteric material is added to the nematic liquid crystal of negative dielectric anisotropy mixed with a blue dye by 2%. The ratio of the thickness of the liquid crystal layer to the focal conic pitch d/p is limited within the range of 0.4 to 0.6. A silicone nitride layer is deposited on the upper transparent electrode so as to form an insulating film. A transparent adhesive layer is formed on the upper surface of the upper glass plate with a glass plate being pressed down to said adhesive layer.
Inventors
- 👤 Eung-Sang Lee
- 👤 Sung-Joon Park
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:58
CPC Classifications
B; B60; B60R; B60R1/00; B60R1/02; B60R1/08; B60R1/083; B60R1/088; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/13725
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
90 words
A non-glaring mirror utilizing a liquid crystal mixture of variable orientation comprising a nematic liquid crystal of negative dielectric anisotropy mixed with a blue dye, said blue dye comprising 2 percent of said mixture and a cholesteric material added in an amount such that the ratio of the thickness of the liquid crystal layer to the focal conic pitch is within the range of 0.4 to 0.6 and further comprising a silicon nitride insulating film deposed on an upper transparent electrode in the thickness range of 300 to 490 angstroms.
Claim 2
Dependent Claim
90 words
A non-glaring mirror utilizing a liquid crystal mixture of variable orientation comprising a nematic liquid crystal of negative dielectric anisotropy mixed with a blue dye, said blue dye comprising 2 percent of said mixture and a cholesteric material added in an amount such that the ratio of the thickness of the liquid crystal layer to the focal conic pitch is within the range of 0.4 to 0.6 and further comprising a silicon nitride insulating film deposed on an upper transparent electrode in the thickness range of 300 to 490 angstroms.
Claim 3
Dependent Claim
132 words
A non-glaring mirror utilizing a liquid crystal mixture of variable orientation comprising a nematic liquid crystal of negative dielectric anisotropy mixed with a blue dye, said blue dye comprising 2 percent of said mixture and a cholesteric material added in an amount such that the ratio of the thickness of the liquid crystal layer to the focal conic pitch is within the range of 0.4 to 0.6 and further comprising a silicon nitride insulating film deposed on an upper transparent electrode in the thickness range of 300 to 490 angstroms, and wherein a transparent-to-visiblelight adhesive, said adhesive acting as an ultraviolet screen and comprising a layer approximately 1 mm thick of polyvinybutyral mixed with benzophenone said adhesive being positioned between the upper surface of an upper glass plate and a glass plate.
Claim 4
Dependent Claim
132 words
A non-glaring mirror utilizing a liquid crystal mixture of variable orientation comprising a nematic liquid crystal of negative dielectric anisotropy mixed with a blue dye, said blue dye comprising 2 percent of said mixture and a cholesteric material added in an amount such that the ratio of the thickness of the liquid crystal layer to the focal conic pitch is within the range of 0.4 to 0.6 and further comprising a silicon nitride insulating film deposed on an upper transparent electrode in the thickness range of 300 to 490 angstroms, and wherein a transparent-to-visiblelight adhesive, said adhesive acting as an ultraviolet screen and comprising a layer approximately 1 mm thick of polyvinybutyral mixed with benzophenone said adhesive being positioned between the upper surface of an upper glass plate and a glass plate.
Claim 5
Dependent Claim
109 words
A non-glaring mirror utilizing a liquid crystal mixture of variable orientation comprising a nematic liquid crystal of negative dielectric anisotropy mixed with a blue dye, said blue dye comprising 2 percent of said mixture and a cholesteric material added in an amount such that the ratio of the thickness of the liquid crystal layer to the focal conic pitch is within the range of 0.4 to 0.6 and further comprising transparent-to-visible-light adhesive, said adhesive acting as an ultraviolet screen and comprising a layer approximately 1 mm thick of polyvinylbutyral mixed with benzophenone said adhesive being positioned between the upper surface of an upper glass plate and a glass plate.
Claim 6
Dependent Claim
109 words
A non-glaring mirror utilizing a liquid crystal mixture of variable orientation comprising a nematic liquid crystal of negative dielectric anisotropy mixed with a blue dye, said blue dye comprising 2 percent of said mixture and a cholesteric material added in an amount such that the ratio of the thickness of the liquid crystal layer to the focal conic pitch is within the range of 0.4 to 0.6 and further comprising transparent-to-visible-light adhesive, said adhesive acting as an ultraviolet screen and comprising a layer approximately 1 mm thick of polyvinylbutyral mixed with benzophenone said adhesive being positioned between the upper surface of an upper glass plate and a glass plate.
Claim 7
Dependent Claim
22 words
A non-glaring mirror as in claim 3, wherein said mirror further comprises a silicon nitride insulating film on an upper transparent electrode.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-17 | 1993-01-16 | 1993-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-17 | 1997-01-16 | 1997-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-17 | 2001-01-16 | 2001-07-18 | $7700.00 | Window Closed / Lapsed |