US5222795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled light extraction from light guides and fibers
Assignee: Light Sciences Inc
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Filing: 1991-12-26
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Granted: 1993-06-29
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Expires: 2011-12-26
Abstract
Abstract A controlled emission of light from an optical waveguide, e.g. a fiber into which light is injected at one end, is effected by modifying the periphery of the waveguide over a generally triangular zone so that there is a controlled emission per unit length at every point along this zone and light emanates continuously over the length of the zone from the fiber.
Inventors
- 👤 Aharon Z. Hed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:29
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/0001; G02B6/0005; G02B6/001
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
189 words
A method of illuminating an area, comprising the steps of: (a) providing at least one elongated light waveguide having a periphery so structured with respect to a core thereof as to enable said core to transmit light along the waveguide while said periphery prevents substantial emanation of light from said core in a direction transverse to said waveguide; (b) modifying a portion of said periphery over an extraction zone L of said waveguide to impart a generally triangular shape to said zone extending continuously from a narrow end to a wide end thereof and so that light travelling through said core in a propagation direction from said narrow end to said wide end will emanate in an emanation direction transversely to said propagation direction, said zone narrowing in width in a spreading direction transversely to said propagation direction and to said emanation direction whereby an area exposed to said light emanating from said waveguide is illuminated continuously along said length of said zone; and (c) injecting light into said waveguide ahead of said narrow end so that the light propagates in said propagation direction whereby said area is illuminated.
Claim 2
Independent Claim
189 words
A method of illuminating an area, comprising the steps of: (a) providing at least one elongated light waveguide having a periphery so structured with respect to a core thereof as to enable said core to transmit light along the waveguide while said periphery prevents substantial emanation of light from said core in a direction transverse to said waveguide; (b) modifying a portion of said periphery over an extraction zone L of said waveguide to impart a generally triangular shape to said zone extending continuously from a narrow end to a wide end thereof and so that light travelling through said core in a propagation direction from said narrow end to said wide end will emanate in an emanation direction transversely to said propagation direction, said zone narrowing in width in a spreading direction transversely to said propagation direction and to said emanation direction whereby an area exposed to said light emanating from said waveguide is illuminated continuously along said length of said zone; and (c) injecting light into said waveguide ahead of said narrow end so that the light propagates in said propagation direction whereby said area is illuminated.
Claim 3
Dependent Claim
74 words
The method defined in claim 1 whereby said waveguide is an optical fiber and said core is cylindrical, said zone having a width in said spreading direction defined by an angle θ(z) whereby z is distance along said zone as measured in said propagation direction, said angle θ(z) substantially satisfying the relationship ##EQU7## where J(z) is a desired light extraction rate per unit length of the extraction zone L, K and C being constants.
Claim 4
Dependent Claim
37 words
The method defined in claim 2 wherein said periphery is formed by a cladding of said optical fiber and said cladding has an index of refraction which is less than an index of refraction of said core.
Claim 5
Dependent Claim
21 words
The method defined in claim 3 wherein said periphery is modified in step (b) by removing said cladding over said zone.
Claim 6
Dependent Claim
26 words
The method defined in claim 4, further comprising the step of rendering a surface of said core which is exposed over said zone diffusively light emissive.
Claim 7
Dependent Claim
18 words
The method defined in claim 5 wherein said surface is rendered diffusively light emissive by abrading said surface.
Claim 8
Dependent Claim
18 words
The method defined in claim 5 wherein said surface is rendered diffusively light emissive by coating said surface.
Claim 9
Dependent Claim
19 words
The method defined in claim 5 wherein said surface is rendered diffusively light emissive by chemically treating said surface.
Claim 10
Dependent Claim
46 words
The method defined in claim 3 wherein said periphery is modified in step (b) by substituting for said cladding in said zone, a cladding of refractive index which is greater than an index of refraction of said core and has a diffusively light emissive outer surface.
Claim 11
Dependent Claim
43 words
The method defined in claim 3 wherein said periphery is modified in step (b) by applying a diffusively reflective coating to said core along but generally opposite said zone, thereby directing light through said core from said reflective coating in said emanation direction.
Claim 12
Independent Claim
186 words
A device for illuminating an area which comprises: at least one elongated light waveguide extending in juxtaposition with said area and having a periphery so structured with respect to a core thereof as to enable said core to transmit light along the length of the waveguide while said periphery prevents emanation of light from said core in a direction transverse to said waveguide, a portion of said periphery over an extraction zone of a length L of said waveguide imparting a generally triangular shape to said zone extending continuously from a narrow end to a wide end thereof and so that light travelling through said core in a propagation direction from said narrow end to said wide end will emanate in an emanation direction transversely to said propagation direction, said zone varying in width in a spreading direction transversely to said propagation direction and to said emanation direction whereby an area exposed to light emanating from said waveguide is illuminated continuously along said length; and means for injecting light into said waveguide ahead of said narrow end so that the light propagates in said propagation direction.
Claim 13
Independent Claim
186 words
A device for illuminating an area which comprises: at least one elongated light waveguide extending in juxtaposition with said area and having a periphery so structured with respect to a core thereof as to enable said core to transmit light along the length of the waveguide while said periphery prevents emanation of light from said core in a direction transverse to said waveguide, a portion of said periphery over an extraction zone of a length L of said waveguide imparting a generally triangular shape to said zone extending continuously from a narrow end to a wide end thereof and so that light travelling through said core in a propagation direction from said narrow end to said wide end will emanate in an emanation direction transversely to said propagation direction, said zone varying in width in a spreading direction transversely to said propagation direction and to said emanation direction whereby an area exposed to light emanating from said waveguide is illuminated continuously along said length; and means for injecting light into said waveguide ahead of said narrow end so that the light propagates in said propagation direction.
Claim 14
Dependent Claim
74 words
The device defined in claim 11 whereby said waveguide is an optical fiber and said core is cylindrical, said zone having a width in said spreading direction subtended by an angle θ(z) whereby z is distance along said zone as measured in said propagation direction, said angle θ(z) substantially satisfying the relationship ##EQU8## where J(z) is a desired light extraction rate per unit of length of said extraction zone, K and C being constants.
Claim 15
Dependent Claim
37 words
The device defined in claim 12 wherein said periphery is formed by a cladding of said optical fiber and said cladding has an index of refraction which is less than an index of refraction of said core.
Claim 16
Dependent Claim
14 words
The device defined in claim 13 wherein said cladding is omitted along said zone.
Claim 17
Dependent Claim
28 words
The device defined in claim 13 wherein said zone is provided with a cladding with an index of refraction greater than an index of refraction of said core.
Claim 18
Dependent Claim
41 words
The device defined in claim 13 wherein said zone is provided with a reflecting coating directing light through said core so that said light emanates from said core at a side thereof opposite that at which said reflective coating is provided.
Claim 19
Dependent Claim
18 words
The device defined in claim 12 wherein a plurality of said fibers is provided in a parallel array.
Claim 20
Independent Claim
171 words
A method of illuminating an area, comprising the steps of: (a) providing at least one elongated light waveguide having a periphery so structured with respect to a core thereof as to enable said core to transmit light along the waveguide while said periphery prevents substantial emanation of light from said core in a direction transverse to said waveguide; (b) modifying a portion of said periphery over a continuous elongate zone of said waveguide having a shape and a width or refractive index selected so that light travelling through said core in a propagation direction along the length of said zone will emanate in an emanation direction transversely to said propagation direction in an intensity dependent upon the shape, width or refractive index to illuminate an area exposed to said light emanating from said waveguide continuously along said length of said zone at a predetermined rate; and (c) injecting light into said waveguide ahead of said narrow end so that the light propagates in said propagation direction whereby said area is illuminated.
Claim 21
Independent Claim
171 words
A method of illuminating an area, comprising the steps of: (a) providing at least one elongated light waveguide having a periphery so structured with respect to a core thereof as to enable said core to transmit light along the waveguide while said periphery prevents substantial emanation of light from said core in a direction transverse to said waveguide; (b) modifying a portion of said periphery over a continuous elongate zone of said waveguide having a shape and a width or refractive index selected so that light travelling through said core in a propagation direction along the length of said zone will emanate in an emanation direction transversely to said propagation direction in an intensity dependent upon the shape, width or refractive index to illuminate an area exposed to said light emanating from said waveguide continuously along said length of said zone at a predetermined rate; and (c) injecting light into said waveguide ahead of said narrow end so that the light propagates in said propagation direction whereby said area is illuminated.
Claim 22
Independent Claim
169 words
A device for illuminating an area which comprises: at least one elongated light waveguide extending in juxtaposition with said area and having a periphery so structured with respect to a core thereof as to enable said core to transmit light along the length of the waveguide while said periphery prevents emanation of light from said core in a direction transverse to said waveguide, a portion of said periphery over an elongate continuous extraction zone of said waveguide imparting a selected shape, width and refractive index to said zone so that light travelling through said core in a propagation direction along a length of the zone will emanate in an emanation direction transversely to said propagation direction, said zone having a shape, width and refractive index selected to illuminate an area exposed to light emanating from said waveguide at a predetermined rate per unit length of the zone; and means for injecting light into said waveguide ahead of said narrow end so that the light propagates in said propagation direction.
Claim 23
Independent Claim
169 words
A device for illuminating an area which comprises: at least one elongated light waveguide extending in juxtaposition with said area and having a periphery so structured with respect to a core thereof as to enable said core to transmit light along the length of the waveguide while said periphery prevents emanation of light from said core in a direction transverse to said waveguide, a portion of said periphery over an elongate continuous extraction zone of said waveguide imparting a selected shape, width and refractive index to said zone so that light travelling through said core in a propagation direction along a length of the zone will emanate in an emanation direction transversely to said propagation direction, said zone having a shape, width and refractive index selected to illuminate an area exposed to light emanating from said waveguide at a predetermined rate per unit length of the zone; and means for injecting light into said waveguide ahead of said narrow end so that the light propagates in said propagation direction.
Claim 24
Independent Claim
178 words
A method of illuminating an area, comprising the steps of: (a) providing at least one elongated light waveguide having a periphery so structured with respect to a core thereof as to enable said core to transmit light along the waveugide while said periphery prevents substantial emanation of light from said core in a direction transverse to said waveguide; (b) varying a refractive index of a portion of said periphery over a fixed continuous elongate zone so that the refractive index of said portion is less than that of said core and that light travelling through said core in a propagation direction along the length of said zone will emanate in an emanation direction transversely to said propagation direction in an intensity dependent upon the variation in the refractive index to illuminate an area exposed to said light emanating from said waveguide continuously along said length of said zone at a predetermined rate; and (c) injecting light into said waveguide ahead of said narrow end so that the light propagates in said propagation direction whereby said area is illuminated.
Claim 25
Independent Claim
178 words
A method of illuminating an area, comprising the steps of: (a) providing at least one elongated light waveguide having a periphery so structured with respect to a core thereof as to enable said core to transmit light along the waveugide while said periphery prevents substantial emanation of light from said core in a direction transverse to said waveguide; (b) varying a refractive index of a portion of said periphery over a fixed continuous elongate zone so that the refractive index of said portion is less than that of said core and that light travelling through said core in a propagation direction along the length of said zone will emanate in an emanation direction transversely to said propagation direction in an intensity dependent upon the variation in the refractive index to illuminate an area exposed to said light emanating from said waveguide continuously along said length of said zone at a predetermined rate; and (c) injecting light into said waveguide ahead of said narrow end so that the light propagates in said propagation direction whereby said area is illuminated.
References Cited (Backward Citations)
US4460930A
Cited
US4822123A
Cited
US4422179A
Cited
US4471412A
Cited
US4779166A
Cited
US4765701A
Cited
US4961617A
Cited
US5036435A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-06-28 | 1996-12-28 | 1997-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-28 | 2000-12-28 | 2001-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-28 | 2004-12-28 | 2005-06-29 | $7700.00 | Window Closed / Lapsed |