US5857761A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Illumination device
Assignee: Hitachi Cable Ltd
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Filing: 1997-04-03
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Granted: 1999-01-12
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Expires: 2017-04-03
Abstract
Abstract An illumination device comprises a light source like a halogen lamp, a light guide, a round rod-shaped transparent radiation member having a proximal end and a distal end, and a transparent radiation plate. The light guide is a plastic optical fiber comprising a single core of silicon rubber and a cladding layer of tetrafluoroethylene/hexafluoropropylene copolymer. The radiation member is a transparent circular cylinder made of acrylic resin, and has a predetermined pattern of light scattering regions on its surface oppose the directions where the light is radiated. The radiation plate is placed such a position that one side plane of the radiation plate oppose to he radiation member, and also has a predetermined pattern of light scattering regions on the back. The light scattering regions are provided along said radiation member in such a way that a ratio of an tea of one region to that of adjacent region becomes larger as the one region becomes distant from the proximal and of the radiation member.
Inventors
- 👤 Tomiya Abe
- 👤 Kouki Hirano
- 👤 Fumitaka Nakahigashi
- 👤 Masanori Matsumoto
- 👤 Yoshikazu Hayakawa
- 👤 Tohru Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:04
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/0001; G02B6/0011; G02B6/0033; G02B6/0058; G02B6/0061; G02B6/0005; G02B6/001; G02B6/0013; G02B6/0023; G02B6/0028; G02B6/0035; G02B6/0038; G02B6/004; G02B6/0043
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
176 words
An illumination device for radiating a predetermined area of light, comprising: a light guide for transmitting light from one end thereof to another end; a rod-shaped transparent radiation member having a proximal end and a distal end, said light being received by said proximal end of said radiation member and radiated therefrom in a predetermined range of radial directions along said radiation member; and a transparent radiation plate having a planar side which opposes said radiation member so that said radiated light from said radiation member is coupled into said radiation plate, and radiated from a front surface of said transparent radiation plate, wherein said rod-shaped transparent radiation member is provided with at least one light scattering region having a predetermined area on its surface opposite said directions; and wherein a plurality of light scattering regions are provided along said radiation member in such a way that a ration of an area of one region to that of adjacent region becomes larger as said one region becomes distant from said proximal end of said radiation member.
Claim 2
Dependent Claim
176 words
An illumination device for radiating a predetermined area of light, comprising: a light guide for transmitting light from one end thereof to another end; a rod-shaped transparent radiation member having a proximal end and a distal end, said light being received by said proximal end of said radiation member and radiated therefrom in a predetermined range of radial directions along said radiation member; and a transparent radiation plate having a planar side which opposes said radiation member so that said radiated light from said radiation member is coupled into said radiation plate, and radiated from a front surface of said transparent radiation plate, wherein said rod-shaped transparent radiation member is provided with at least one light scattering region having a predetermined area on its surface opposite said directions; and wherein a plurality of light scattering regions are provided along said radiation member in such a way that a ration of an area of one region to that of adjacent region becomes larger as said one region becomes distant from said proximal end of said radiation member.
Claim 3
Dependent Claim
143 words
An illumination device for radiating a predetermined area of light, comprising: a rod-shaped transparent radiation member having a proximal end and a distal end, light being received by said proximal end of said radiation member and radiated therefrom in a predetermined range of radial directions along said radiation member, said rod-shaped transparent radiation member being provided with a plurality of light scattering regions having a predetermined area on its surface opposite said directions; wherein said plurality of light scattering regions are provided along said radiation member in such a way that a ration of an area of one region to that of adjacent region becomes larger as said one region becomes distant from said proximal end of said radiation member, wherein said radiation member further includes a transport cladding layer surrounding said radiation member, and a light diffusion layer surrounding said cladding layer.
Claim 4
Dependent Claim
143 words
An illumination device for radiating a predetermined area of light, comprising: a rod-shaped transparent radiation member having a proximal end and a distal end, light being received by said proximal end of said radiation member and radiated therefrom in a predetermined range of radial directions along said radiation member, said rod-shaped transparent radiation member being provided with a plurality of light scattering regions having a predetermined area on its surface opposite said directions; wherein said plurality of light scattering regions are provided along said radiation member in such a way that a ration of an area of one region to that of adjacent region becomes larger as said one region becomes distant from said proximal end of said radiation member, wherein said radiation member further includes a transport cladding layer surrounding said radiation member, and a light diffusion layer surrounding said cladding layer.
Claim 5
Dependent Claim
159 words
An illumination device for radiating a predetermined area of light, comprising: a rod-shaped transparent radiation member having a proximal end and a distal end, light being received by said proximal end of said radiation member and radiated therefrom in a predetermined range of radial directions along said radiation member, said rod-shaped transparent radiation member being provided with a plurality of light scattering regions having a predetermined area on its surface opposite said directions, said plurality of light scattering regions being provided along said radiation member in such a way that a ration of an area of one region to that of adjacent region becomes larger as said one region becomes distant from said proximal end of said radiation member; and a transparent radiation plate having a planar side which opposes said radiation member so that said radiated light from said radiation member is coupled into said radiation plate, and radiated from a front surface of said transparent radiation plate.
Claim 6
Dependent Claim
159 words
An illumination device for radiating a predetermined area of light, comprising: a rod-shaped transparent radiation member having a proximal end and a distal end, light being received by said proximal end of said radiation member and radiated therefrom in a predetermined range of radial directions along said radiation member, said rod-shaped transparent radiation member being provided with a plurality of light scattering regions having a predetermined area on its surface opposite said directions, said plurality of light scattering regions being provided along said radiation member in such a way that a ration of an area of one region to that of adjacent region becomes larger as said one region becomes distant from said proximal end of said radiation member; and a transparent radiation plate having a planar side which opposes said radiation member so that said radiated light from said radiation member is coupled into said radiation plate, and radiated from a front surface of said transparent radiation plate.
Claim 7
Dependent Claim
22 words
An illumination device, according to claim 3, further comprising a light guide for transmitting light from one end thereof to another end.
Claim 8
Dependent Claim
21 words
An illumination device, according to claim 4, wherein said light guide is a plastic optical fiber having relatively high heat-resisting characteristics.
Claim 9
Dependent Claim
26 words
An illumination device, according to claim 3, wherein said plurality of light scattering regions includes a region of paint for scattering a part of said light.
Claim 10
Dependent Claim
26 words
An illumination device, according to claim 3, wherein said plurality of light scattering regions includes a region of scratches for scattering a part of said light.
Claim 11
Dependent Claim
29 words
An illumination device, according to claim 3, wherein said radiation plate is provided with at least one light scattering region on a back surface thereof opposite said front surface.
Claim 12
Dependent Claim
21 words
An illumination device, according to claim 3, wherein said radiation member is provided with a light reflector at said distal end.
Claim 13
Dependent Claim
37 words
An illumination device, according to claim 9, wherein said radiation member is provided with a refraction matching medium layer around said radiation member, the refractive index thereof being substantially the same as that of said radiation member.
Claim 14
Dependent Claim
38 words
An illumination device, according to claim 10, wherein: the refractive index of said refraction matching medium layer n m satisfies the condition in that 0.95n.sub.0 <n.sub.m <1.05n.sub.0 where n 0 is the refractive index of said radiation member.
Claim 15
Dependent Claim
24 words
An illumination device, according to claim 3, wherein said distal end of said radiation member is an inclined flat end against its longitudinal axis.
Claim 16
Dependent Claim
28 words
An illumination device, according to claim 12, wherein said distal end is inclined by between 91 degrees and 100 degrees against its longitudinal axis of said radiation member.
Claim 17
Dependent Claim
20 words
An illumination device, according to claim 3, wherein said distal end of said radiation member is a convexly curved end.
Claim 18
Dependent Claim
16 words
An illumination device, according to claim 3, wherein said plurality of scattering regions have strip shapes.
Claim 19
Dependent Claim
60 words
An illumination device, according to claim 3, wherein said plurality of scattering regions are arranged such that a ratio of an area of one region to that of adjacent region becomes larger as said one region becomes distant from said proximal end and said radiation member, so that the luminance of said radiated light is uniform along said radiation member.
Claim 20
Dependent Claim
30 words
An illumination device, according to claim 3, wherein said plurality of light scattering regions are formed from a plurality of resin films bearing at least one substance for scattering light.
Claim 21
Dependent Claim
58 words
An illumination device, according to claim 17, wherein: each said resin film is provided with an adhesive layer on the back so as to be attached on the radiation member, the refractive index n t of said adhesive layer satisfying the condition in that 0.95n.sub.0 <n.sub.t <1.05n.sub.0 where n 0 is the refractive index of said radiation member.
Claim 22
Dependent Claim
36 words
An illumination device, according to claim 3, wherein said radiation member has a cross-sectional shape being selected from the group consisting of a circle, an ellipse, and a polygon with more than four sides and angles.
Claim 23
Dependent Claim
15 words
An illumination device, according to claim 3, wherein said radiation member is a tapered rod.
Claim 24
Dependent Claim
33 words
An illumination device, according to claim 2, flier comprising an opal light diffuser being placed in such a position that said light diffuser is irradiated by said radiated light from said radiation member.
Claim 25
Dependent Claim
48 words
An illumination device, according to claim 2, further comprising a transparent radiation plate having a planar side which opposes said radiation member so that said radiated light from said radiation member is coupled into said radiation plate, and radiated from a front surface of said transparent radiation plate.
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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) | 2002-01-11 | 2002-07-13 | 2003-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-01-11 | 2006-07-13 | 2007-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-01-11 | 2010-07-13 | 2011-01-12 | $7700.00 | Window Closed / Lapsed |