US4779166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Illuminating apparatus
Assignee: Fujitsu Ltd
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Filing: 1987-12-08
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Granted: 1988-10-18
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Expires: 2007-12-08
Abstract
Abstract An illuminating apparatus which comprises a plane board composed of a transparent resin having an organic fluorescent dye incorporated therein and a light-reflecting member arranged on at least a part of the back surface of the plane board, wherein a light incident from at least a part of the end face of the plane board is emitted from at least a part of the surface of the plane board.
Inventors
- 👤 Akira Tanaka
- 👤 Shinpei Nagatani
- 👤 Hisashi Sawada
- 👤 Eietsu Takahashi
- 👤 Noboru Wakatsuki
- 👤 Takehisa Takoshima
- 👤 Fumiaki Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:10
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/0001; G02B6/0011; G02B6/0013; G02B6/0015; G02B6/002; G02B6/0021; G02B6/0033; G02B6/0035; G02B6/0036; G02B6/004; G02B6/0041; G02B6/0058; G02B6/0061; G02B6/0066; G02B6/0073; G02B6/0081; G02B6/0086; G02B6/009
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
69 words
An illuminating apparatus which comprises a plane board composed of a transparent resin having an organic fluorescent dye incorporated therein and a light-reflecting member arranged on at least a part of the back surface of the plane board, wherein a light incident from at least a part of the end face of the plane board is emitted from at least a part of the surface of the plane board.
Claim 2
Dependent Claim
69 words
An illuminating apparatus which comprises a plane board composed of a transparent resin having an organic fluorescent dye incorporated therein and a light-reflecting member arranged on at least a part of the back surface of the plane board, wherein a light incident from at least a part of the end face of the plane board is emitted from at least a part of the surface of the plane board.
Claim 3
Dependent Claim
32 words
An apparatus as set forth in claim 1, wherein the transparent resin is selected from the group consisting of polycarbonate, polystyrene, polymethyl methacrylate and a blend of polymethyl methacrylate and polyvinylidene fluoride.
Claim 4
Dependent Claim
36 words
An apparatus as set forth in claim 1, wherein the organic fluorescent dye is selected from the group consisting of a perylene type fluorescent dye, a naphthalimide type fluorescent dye and a cumarine type fluorescent dye.
Claim 5
Dependent Claim
23 words
An apparatus as set forth in claim 1, wherein a light source is arranged on at least one end of the plane board
Claim 6
Dependent Claim
21 words
An apparatus as set forth in claim 4, wherein the light source is a tungsten lamp or LED or fluorescent lamp.
Claim 7
Dependent Claim
24 words
An apparatus as set forth in claim 1, wherein the light-reflecting member is a white paint layer, an aluminum foil or a roughened surface.
Claim 8
Dependent Claim
14 words
An apparatus as set forth in claim 1, wherein the light-reflecting member is reflectance-variable.
Claim 9
Dependent Claim
22 words
An apparatus as set forth in claim 1, wherein the light-guiding member is further disposed on the surface of the plane board.
Claim 10
Dependent Claim
21 words
An apparatus as set forth in claim 1, which is used as a back light of a liquid crystal display panel.
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) | 1991-10-18 | 1992-04-18 | 1992-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-18 | 1996-04-18 | 1996-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-18 | 2000-04-18 | 2000-10-18 | $7700.00 | Window Closed / Lapsed |