US4729638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal-type nonglare mirror
Assignee: Sharp Corp
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Filing: 1985-07-29
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Granted: 1988-03-08
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Expires: 2005-07-29
Abstract
Abstract A liquid crystal-type nonglare mirror suitable for room mirrors or for vehicles, which effectively prevents the formation of interference fringes under light sources, such as sodium lamps, halogen lamps and the like. The mirror is composed of a transparent electrode base, a liquid crystal and a reflective electrode base, in which the liquid crystal is placed between the above electrode bases. The technical effects may be provided by the limitation that rubbing directions of both electrodes are nonparallel and that the twist angle of the liquid crystal is about 360°. The technical effects may also be obtained from the insertion of a silicon nitride layer in the construction of the mirror.
Inventors
- 👤 Yoshihiro Shirai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:26
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/08; G02B5/0816; G02B5/085; G02B5/0858; B; B60; B60R; B60R1/00; B60R1/02; B60R1/08; B60R1/083; B60R1/088; G02B5/0866; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133504; G02F1/137; G02F1/13725; G02F1/13356; G02F1/133565
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
55 words
A liquid crystal nonglare mirror comprising a guest-host liquid crystal between a transparent electrode base and a reflective electrode base, in which both bases of which rubbing directions are nonparallel are subjected to a treatment for homogeneous alignment and a twist angle of the liquid crystal is about 360° in order to prevent interference fringes.
Claim 2
Dependent Claim
55 words
A liquid crystal nonglare mirror comprising a guest-host liquid crystal between a transparent electrode base and a reflective electrode base, in which both bases of which rubbing directions are nonparallel are subjected to a treatment for homogeneous alignment and a twist angle of the liquid crystal is about 360° in order to prevent interference fringes.
Claim 3
Dependent Claim
41 words
The mirror of claim 1 in which a front substrate is provided for said transparent electrode, said front substrate having a microscopically rough surface and a bottom substrate is provided for the reflective electrode base, said bottom substrate being generally flat.
Claim 4
Dependent Claim
58 words
A liquid crystal nonglare mirror for preventing interference fringes comprising a guest-host liquid crystal between a transparent electrode substrate and a reflective electrode substrate, in which at least one of the transparent electrode base and the reflective electrode base is composed of a transparent electrode, a silicon nitride insulation layer and a polyimide orientation layer in this order.
Claim 5
Dependent Claim
58 words
A liquid crystal nonglare mirror for preventing interference fringes comprising a guest-host liquid crystal between a transparent electrode substrate and a reflective electrode substrate, in which at least one of the transparent electrode base and the reflective electrode base is composed of a transparent electrode, a silicon nitride insulation layer and a polyimide orientation layer in this order.
Claim 6
Dependent Claim
33 words
The nonglare mirror of claim 3 in which the front substrate of the transparent electrode base has a microscopically rough surface and the bottom substrate of the reflective electrode base is generally flat.
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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) | 1991-03-08 | 1991-09-07 | 1992-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-08 | 1995-09-07 | 1996-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-08 | 1999-09-07 | 2000-03-08 | $7700.00 | Window Closed / Lapsed |