US5581683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light diffusing apparatus with U-shaped light guide
Assignee: Nortel Networks Ltd
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Filing: 1995-02-09
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Granted: 1996-12-03
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Expires: 2015-02-09
Abstract
Abstract A light diffusing apparatus, which may be used as an elongate visual indicator in telephone sets, video cassette recorders etc, provides very even illumination (i.e., evenly diffused light without any discernible bright spots) when illuminated by spot light from one or two light emitting diodes. The apparatus includes a light guide having a light path of sufficient length to disperse the spot light from the emitting diodes. The dispersed light from the light guide then passes through a light diffuser. The light output end of the light guide and the light input surface of the light diffuser have uniform texture surfaces to further diffuse the dispersed light. The light diffuser may include diffusing particles. Very even illumination without any discernible bright spots is provided.
Inventors
- 👤 Friedrich Bertignoll
- 👤 Paul J. Koens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:43
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/0001; G02B6/0011; G02B6/0013; G02B6/0023; G02B6/0028; G02B6/0003; G02B6/0033; G02B6/0035; G02B6/004; G02B6/0041; G02B6/24; G02B6/241; G09; G09F; G09F9/00; G09F9/30; G09F9/305; F; F21; F21Y; F21Y2115/00; F21Y2115/10; G02B6/0015; G02B6/0016; Y; Y10; Y10S; Y10S385/00; Y10S385/901
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
238 words
Apparatus for providing substantially evenly diffused light from light radially emitted by a light source, comprising: a substantially U-shaped light guide having first and second end surfaces which are spaced apart from each other at opposite ends of the U-shaped light guide so as to face from the light guide in substantially the same direction, the first end surface facing the light source to receive the radially emitted light with the second end surface being elongate, said light guide having sufficient length between the first and second end surfaces to disperse the radially emitted light, while the light is transmitted around the U-shade of the guide from the first end surface to the second end surface, to provide substantially dispersed light across the entire second end surface; and a light diffuser having opposed elongate light input and output surfaces, the light input surface being adjacent to and extending along the second end surface, the second end surface of the light guide and the light input surface of the light diffuser provided at a light transfer region to transfer the substantially dispersed light from the light guide to the light diffuser, at least one of the surfaces of the light transfer region having a uniform texture to further disperse the dispersed light, and the light diffuser capable of diffusing the dispersed light transferred through the light transfer region substantially evenly across the light output surface of the light diffuser.
Claim 2
Dependent Claim
238 words
Apparatus for providing substantially evenly diffused light from light radially emitted by a light source, comprising: a substantially U-shaped light guide having first and second end surfaces which are spaced apart from each other at opposite ends of the U-shaped light guide so as to face from the light guide in substantially the same direction, the first end surface facing the light source to receive the radially emitted light with the second end surface being elongate, said light guide having sufficient length between the first and second end surfaces to disperse the radially emitted light, while the light is transmitted around the U-shade of the guide from the first end surface to the second end surface, to provide substantially dispersed light across the entire second end surface; and a light diffuser having opposed elongate light input and output surfaces, the light input surface being adjacent to and extending along the second end surface, the second end surface of the light guide and the light input surface of the light diffuser provided at a light transfer region to transfer the substantially dispersed light from the light guide to the light diffuser, at least one of the surfaces of the light transfer region having a uniform texture to further disperse the dispersed light, and the light diffuser capable of diffusing the dispersed light transferred through the light transfer region substantially evenly across the light output surface of the light diffuser.
Claim 3
Dependent Claim
23 words
Apparatus according to claim 1, wherein the light input surface of the light diffuser has uniform texture to diffuse the substantially dispersed light.
Claim 4
Dependent Claim
17 words
Apparatus according to claim 1, wherein the second end surface of the light guide has uniform texture.
Claim 5
Dependent Claim
15 words
Apparatus according to claim 1 or 3, wherein the light diffuser includes diffusing particles therein.
Claim 6
Dependent Claim
14 words
Apparatus according to claim 4, wherein the light diffusing particles are of plastic material.
Claim 7
Dependent Claim
46 words
Apparatus according to claim 1 wherein the light guide is substantially rectangular in cross-section with two major side surfaces and is in U-shape with a major side surface of one end region opposing a major side surface of the other end region of the light guide.
Claim 8
Dependent Claim
46 words
Apparatus according to claim 1, wherein the light source comprises two light emitting devices, the distance between which being about a half of the elongate length of the first end surface, the two light emitting devices being centered about the center of the first end surface.
Claim 9
Dependent Claim
186 words
Apparatus for providing substantially evenly diffused light from light radially emitted by a light source, comprising: a substantially U-shaped light guide having first and second end surfaces which are spaced apart from each other at opposite ends of the U-shaped light guide so as to face from the light guide in substantially the same direction, the first end surface facing the light source to receive the radially emitted light with the second end surface being elongate; said light guide having sufficient length between the first and second end surfaces to disperse the radially emitted light, while the light is transmitted around the U-shape of the light guide from the first end surface to the second end surface, to provide substantially dispersed light across the entire second end surface; and a light diffuser having opposed light input and output surfaces, the light input surface being adjacent to and extending along the second surface for the light input surface to receive the substantially dispersed light; said light diffuser including light diffusing particles distributed therein to effect diffusion of the dispersed light substantially evenly across the light output surface.
Claim 10
Dependent Claim
186 words
Apparatus for providing substantially evenly diffused light from light radially emitted by a light source, comprising: a substantially U-shaped light guide having first and second end surfaces which are spaced apart from each other at opposite ends of the U-shaped light guide so as to face from the light guide in substantially the same direction, the first end surface facing the light source to receive the radially emitted light with the second end surface being elongate; said light guide having sufficient length between the first and second end surfaces to disperse the radially emitted light, while the light is transmitted around the U-shape of the light guide from the first end surface to the second end surface, to provide substantially dispersed light across the entire second end surface; and a light diffuser having opposed light input and output surfaces, the light input surface being adjacent to and extending along the second surface for the light input surface to receive the substantially dispersed light; said light diffuser including light diffusing particles distributed therein to effect diffusion of the dispersed light substantially evenly across the light output surface.
Claim 11
Dependent Claim
12 words
Apparatus according to claim 8, wherein the diffusing particles are plastic material.
Claim 12
Dependent Claim
25 words
Apparatus according to claim 8, wherein the light input surface of the light diffuser is bonded to the second end surface of the light guide.
Claim 13
Dependent Claim
46 words
Apparatus according to claim 8, wherein the light source comprises two light emitting devices, the distance between which being about a half of the elongate length of the first end surface, the two light emitting devices being centered about the center of the first end surface.
Claim 14
Dependent Claim
135 words
Apparatus for providing substantially evenly diffused light from light radially emitted by a light source, comprising a substantially U-shaped light guide having first and second end surfaces which are spaced apart from each other at opposite ends of the U-shaped light guide, the first end surface facing the light source to receive the radially emitted light with the second end surface being elongate, the light guide having a first end region extending from the first end surface and a second end region extending from the first end region to the second end surface, the first end region being of sufficient length to provide substantially dispersed light, the light guide including diffusing particles distributed therein at the second end region for diffusing the dispersed light substantially evenly across the second end surface of the light guide.
Claim 15
Dependent Claim
135 words
Apparatus for providing substantially evenly diffused light from light radially emitted by a light source, comprising a substantially U-shaped light guide having first and second end surfaces which are spaced apart from each other at opposite ends of the U-shaped light guide, the first end surface facing the light source to receive the radially emitted light with the second end surface being elongate, the light guide having a first end region extending from the first end surface and a second end region extending from the first end region to the second end surface, the first end region being of sufficient length to provide substantially dispersed light, the light guide including diffusing particles distributed therein at the second end region for diffusing the dispersed light substantially evenly across the second end surface of the light guide.
Claim 16
Dependent Claim
12 words
Apparatus according to claim 12, wherein the diffusing particles are plastic material.
Claim 17
Dependent Claim
46 words
Apparatus according to claim 12, wherein the light source comprises two light emitting devices, the distance between which being about a half of the elongate length of the first end surface, the two light emitting devices being centered about the center of the first end surface.
Claim 18
Dependent Claim
243 words
A telephone base housing an apparatus for providing substantially evenly diffused light from spot light generated by a light source, the apparatus comprising: a substantially U-shaped light guide having first and second end surfaces which are spaced apart from each other at opposite ends of the U-shaped light guide so as to face from the light guide in substantially the same direction, the first end surface facing the light source to receive the emitted light with the second end surface being elongate, said light guide having sufficient length between the first and second end surfaces to disperse the emitted light, while the light is transmitted around the U-shape of the guide from the first end surface to the second end surface, to provide substantially dispersed light across the entire second end surface; and a light diffuser having opposed elongate light input and output surfaces, the light input surface being adjacent to and extending along the second end surface, the second end surface of the light guide and the light input surface of the light diffuser provided at a light transfer region to transfer the substantially dispersed light from the light guide to the light diffuser, at least one of the surfaces of the light transfer region having a uniform texture to further disperse the dispersed light, and the light diffuser capable of diffusing the dispersed light transferred through the light transfer region substantially evenly across the light output surface of the light diffuser.
Claim 19
Dependent Claim
243 words
A telephone base housing an apparatus for providing substantially evenly diffused light from spot light generated by a light source, the apparatus comprising: a substantially U-shaped light guide having first and second end surfaces which are spaced apart from each other at opposite ends of the U-shaped light guide so as to face from the light guide in substantially the same direction, the first end surface facing the light source to receive the emitted light with the second end surface being elongate, said light guide having sufficient length between the first and second end surfaces to disperse the emitted light, while the light is transmitted around the U-shape of the guide from the first end surface to the second end surface, to provide substantially dispersed light across the entire second end surface; and a light diffuser having opposed elongate light input and output surfaces, the light input surface being adjacent to and extending along the second end surface, the second end surface of the light guide and the light input surface of the light diffuser provided at a light transfer region to transfer the substantially dispersed light from the light guide to the light diffuser, at least one of the surfaces of the light transfer region having a uniform texture to further disperse the dispersed light, and the light diffuser capable of diffusing the dispersed light transferred through the light transfer region substantially evenly across the light output surface of the light diffuser.
Claim 20
Dependent Claim
17 words
A telephone base according to claim 15 wherein the light guide is substantially rectangular in cross section.
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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) | 1999-12-03 | 2000-06-03 | 2000-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-12-03 | 2004-06-03 | 2004-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-12-03 | 2008-06-03 | 2008-12-03 | $7700.00 | Window Closed / Lapsed |