WO1999066258A1 - Illumination system - Google Patents
Illumination system Download PDFInfo
- Publication number
- WO1999066258A1 WO1999066258A1 PCT/GB1999/001900 GB9901900W WO9966258A1 WO 1999066258 A1 WO1999066258 A1 WO 1999066258A1 GB 9901900 W GB9901900 W GB 9901900W WO 9966258 A1 WO9966258 A1 WO 9966258A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light
- emitting optical
- light source
- optical fibre
- fibre
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0005—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being of the fibre type
- G02B6/001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being of the fibre type the light being emitted along at least a portion of the lateral surface of the fibre
Definitions
- This invention relates to an illumination system and relates more particularly but not exclusively to an illumination system for the controlled distribution of light to a region or regions which may be remote from a light source of the system.
- Side-emitting optical fibres are known forms of light- transmitting glass or polymer fibre in which light carried along to fibre is radiated out of the fibre along its length.
- the light originates with a lamp, such as an incandescent lamp, at one end of the side- emitting optical fibre.
- a lamp such as an incandescent lamp
- the dissipative nature of the side-emitting optical fibres limits the distance to which practicable levels of illumination can be carried from the lamp.
- an illumination system comprising light source means, side-emitting optical fibre means, and substantially non-dissipative optical waveguide means optically coupling the light source means to the side-emitting optical fibre means whereby in operation of the illumination system, light originating in the light source means is conveyed by the optical waveguide means to the side-emitting optical fibre means to be radiated therefrom.
- the light source means may comprise any suitable form of lamp or other light-emitting means and preferably comprises a laser.
- the laser may emit light of a visible wavelength or the laser may emit light of a non-visible wavelength which may subseq ⁇ ently be transformed to visible light.
- the optical waveguide means preferably comprising light-transmitting optical fibre means and may have a substantial length, for example up to 1 kilometre.
- the illumination system may comprise a plurality of side-emitting optical fibres each coupled to the light source means by a respective light-transmitting optical fibre which is substantially non-dissipative relative to the side-emitting optical fibre.
- the plurality of side-emitting optical fibres may be disposed in a common array, or the plurality of side-emitting optical fibres may be disposed in a mutually independent manner.
- the illumination system may further comprise sequential scanning means interposed between the light source means and the plurality of light-transmitting optical fibres whereby in operation of the illumination system, the light-transmitting optical fibres are intermittently coupled to the light source means in sequence and the respective side-emitting optical fibres intermittently radiate light in sequence.
- an illumination system comprising side-emitting optical fibre means having a first end and a second end, a first light source means, first substantially non-dissipative optical waveguide means optically coupling the first light source means to the first end of the side-emitting optical fibre means, a second light source means, second substantially non- dissipative optical waveguide means optically coupling the second light source means to the second end of the side-emitting optical fibre means, control means for controlling operation of the first and second light source means, first light monitoring means for monitoring receipt of light from the first light source means at the second end of the side-emitting optical fibre means and/or at the end of the second optical waveguide means remote from the second end of the side- emitting
- an illumination system comprising side-emitting optical fibre means and light transformation means disposed in relation to the side- emitting optical fibre means as to transform in a predetermined manner light emitted by the side-emitting optical fibre means.
- the light transformation means may comprise a coating or a sheath surrounding the side-emitting optical fibre means, the coating or sheath comprising material having optical properties which transform light emitted by the side-emitting optical fibre means in said predetermined manner.
- the transformation may simply comprise attenuation of undesirable frequencies (eg, an ultra- violet filter) but the transformation preferably comprises conversion of at least part of emitted light to a more desirable form, eg to convert emitted light of a less visible wavelength to light of a more visible wavelength.
- the coating or sheath may comprise a fluorescent material which, for example, converts an infra-red component of fibre-emitted light to externally visible light.
- an illumination system comprising a side-emitting optical fibre, mounting means for mounting the fibre in an arrangement that illuminates a predetermined area with light emitted by the fibre when the fibre is supplied with light at one or both ends thereof, and masking means for masking the illuminated area with a predetermined pattern.
- the predetermined pattern may comprise representations of one or more symbols (eg, an arrow) , one or more icons (eg, a running person) and/or one or more strings of alpha- numeric characters (eg, the words "EMERGENCY EXIT”) .
- the mounting means may comprise a sheet of transparent or translucent material having a channel formed in one face thereof to extend across at least said predetermined area, the optical fibre being disposed in said channel and preferably optically coupled to the material of the sheet by means of an index matching material substantially filling the remainder of the channel around the fibre.
- an illumination system 10 comprises an array 12 of ten lengths of side-emitting optical fibre 14.
- the fibres 14 are each of the order of 50-100 metres in length and are approximately end- to-end within array 12, each in its respective optical path, as will be detailed below.
- the combined lengths of the ten end-to-end fibres 14 make the array 12 of the order of 500 metres - 1 kilometre in length.
- Each of the side-emitting optical fibres 14 is optically coupled by way of a respective optical waveguide 16 to a respective output of a ten-way optical scanner 18.
- the optical waveguides 16 are each an appropriate length of non-dissipative light- transmitting optical fibre.
- the illumination system 10 includes a laser 20 whose continuous-wave output beam 22 is directed against a mirror 24 forming the input to the scanner 18.
- the mirror 24 undergoes controlled pivotal oscillation to direct the laser beam 22 against each of the ten scanner outputs in sequence.
- the combination of the laser 20, the scanner 18, and the optical waveguides 16 causes each of the side-emitting optical fibres 14 to illuminate in sequence.
- a "travelling wave" effect can be generated in the array 12. This effect can be enhanced by adjusting the operational speed of the scanner 18, ie the oscillation rate of the mirror 24, such as to give less than one-seventh of second of illumination to each of the fibres 14 in the array 12.
- Each of the side-emitting optical fibres 14 is preferably covered by a polypropylene sheath (not shown) doped with a mercury fluorescent dye, such as the dye denoted "UN 6941", so as to enhance the output of light at frequencies to which the human eye is most responsive.
- a mercury fluorescent dye such as the dye denoted "UN 6941”
- the illumination system 10 can provide sufficient luminosity over an extended distance to indicate an escape route in subdued lighting conditions.
- each of the side-emitting optical fibres 14 is optically connected by a respective optical waveguide 26 of appropriate length to a respective input of a ten-channel light monitor 28 which serves to monitor the correct illumination of each of the fibres 14 in sequence.
- the monitor 28 can be arranged to give an appropriate alarm signal.
- the system is adapted to provide audio tones.
- a housing or box is fitted to sections of the side emitting fibre.
- a light sensitive element within the housing causes operation of a tone generator resulting in a tone being emitted from the housing.
- the tone generating system may include a filter arrangement whereby the tone generating system is activated only by the light emanating from the side emitting fibres .
- the system is fed from a fire detection system to alter the scan direction.
- the effect of this is that the directional information (either audible or visible) is directed to maximise the escape route information.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
There is described an illumination system (10) which has a light source (20) which transmits light through a side-emitting optical fibre (14). The light source (20) is connected to the optical fibre (14) by means of a non-dissipative optical waveguide (16) so that light from the light source (20) is conveyed to the side-emitting optical fibre (14) means to be subsequently radiated therefrom.
Description
"Illumination System"
This invention relates to an illumination system and relates more particularly but not exclusively to an illumination system for the controlled distribution of light to a region or regions which may be remote from a light source of the system.
Side-emitting optical fibres are known forms of light- transmitting glass or polymer fibre in which light carried along to fibre is radiated out of the fibre along its length. The light originates with a lamp, such as an incandescent lamp, at one end of the side- emitting optical fibre. The dissipative nature of the side-emitting optical fibres limits the distance to which practicable levels of illumination can be carried from the lamp.
According to a first aspect of the present invention there is provided an illumination system comprising light source means, side-emitting optical fibre means, and substantially non-dissipative optical waveguide means optically coupling the light source means to the side-emitting optical fibre means whereby in operation of the illumination system, light originating in the
light source means is conveyed by the optical waveguide means to the side-emitting optical fibre means to be radiated therefrom.
The light source means may comprise any suitable form of lamp or other light-emitting means and preferably comprises a laser. The laser may emit light of a visible wavelength or the laser may emit light of a non-visible wavelength which may subseqμently be transformed to visible light. The optical waveguide means preferably comprising light-transmitting optical fibre means and may have a substantial length, for example up to 1 kilometre.
The illumination system may comprise a plurality of side-emitting optical fibres each coupled to the light source means by a respective light-transmitting optical fibre which is substantially non-dissipative relative to the side-emitting optical fibre. The plurality of side-emitting optical fibres may be disposed in a common array, or the plurality of side-emitting optical fibres may be disposed in a mutually independent manner. The illumination system may further comprise sequential scanning means interposed between the light source means and the plurality of light-transmitting optical fibres whereby in operation of the illumination system, the light-transmitting optical fibres are intermittently coupled to the light source means in sequence and the respective side-emitting optical fibres intermittently radiate light in sequence. Where the side-emitting optical fibres are disposed in a common array, the array may be elongate with the side- emitting optical fibres being disposed at staggered locations along the array whereby in operation, the arrangements cause a visible travelling wave effect.
According to a second aspect of the present invention there is provided an illumination system comprising side-emitting optical fibre means having a first end and a second end, a first light source means, first substantially non-dissipative optical waveguide means optically coupling the first light source means to the first end of the side-emitting optical fibre means, a second light source means, second substantially non- dissipative optical waveguide means optically coupling the second light source means to the second end of the side-emitting optical fibre means, control means for controlling operation of the first and second light source means, first light monitoring means for monitoring receipt of light from the first light source means at the second end of the side-emitting optical fibre means and/or at the end of the second optical waveguide means remote from the second end of the side- emitting optical fibre means when the control means functions to control light production by the first light source means, and second light monitoring means for monitoring receipt of light from the second light source means at the first end of the side-emitting optical fibre means and/or at the end of the first optical waveguide means remote from the first end of the side-emitting optical fibre means when the control means functions to control light production by the second light source means. Thereby operation of the illumination system can be monitored for continuity of illumination and for possible breaks in any light transmission path.
According to a third aspect of the present invention there is provided an illumination system comprising side-emitting optical fibre means and light transformation means disposed in relation to the side- emitting optical fibre means as to transform in a
predetermined manner light emitted by the side-emitting optical fibre means.
The light transformation means may comprise a coating or a sheath surrounding the side-emitting optical fibre means, the coating or sheath comprising material having optical properties which transform light emitted by the side-emitting optical fibre means in said predetermined manner. The transformation may simply comprise attenuation of undesirable frequencies (eg, an ultra- violet filter) but the transformation preferably comprises conversion of at least part of emitted light to a more desirable form, eg to convert emitted light of a less visible wavelength to light of a more visible wavelength. The coating or sheath may comprise a fluorescent material which, for example, converts an infra-red component of fibre-emitted light to externally visible light.
According to a fourth aspect of the present invention there is provided an illumination system comprising a side-emitting optical fibre, mounting means for mounting the fibre in an arrangement that illuminates a predetermined area with light emitted by the fibre when the fibre is supplied with light at one or both ends thereof, and masking means for masking the illuminated area with a predetermined pattern. The predetermined pattern may comprise representations of one or more symbols (eg, an arrow) , one or more icons (eg, a running person) and/or one or more strings of alpha- numeric characters (eg, the words "EMERGENCY EXIT") .
The mounting means may comprise a sheet of transparent or translucent material having a channel formed in one face thereof to extend across at least said predetermined area, the optical fibre being disposed in
said channel and preferably optically coupled to the material of the sheet by means of an index matching material substantially filling the remainder of the channel around the fibre.
Embodiments of the invention will now be described by way of example, with reference to the accompanying drawing, the sole Figure of which is a schematic representation of a preferred embodiment of illumination system in accordance with the invention.
Referring to the sole Figure, an illumination system 10 comprises an array 12 of ten lengths of side-emitting optical fibre 14. The fibres 14 are each of the order of 50-100 metres in length and are approximately end- to-end within array 12, each in its respective optical path, as will be detailed below. The combined lengths of the ten end-to-end fibres 14 make the array 12 of the order of 500 metres - 1 kilometre in length.
Each of the side-emitting optical fibres 14 is optically coupled by way of a respective optical waveguide 16 to a respective output of a ten-way optical scanner 18. The optical waveguides 16 are each an appropriate length of non-dissipative light- transmitting optical fibre.
The illumination system 10 includes a laser 20 whose continuous-wave output beam 22 is directed against a mirror 24 forming the input to the scanner 18. The mirror 24 undergoes controlled pivotal oscillation to direct the laser beam 22 against each of the ten scanner outputs in sequence. The combination of the laser 20, the scanner 18, and the optical waveguides 16 causes each of the side-emitting optical fibres 14 to illuminate in sequence.
By suitable layout of the optical fibres 14 and of their connections to the scanner 18 a "travelling wave" effect can be generated in the array 12. This effect can be enhanced by adjusting the operational speed of the scanner 18, ie the oscillation rate of the mirror 24, such as to give less than one-seventh of second of illumination to each of the fibres 14 in the array 12.
Each of the side-emitting optical fibres 14 is preferably covered by a polypropylene sheath (not shown) doped with a mercury fluorescent dye, such as the dye denoted "UN 6941", so as to enhance the output of light at frequencies to which the human eye is most responsive.
The illumination system 10 can provide sufficient luminosity over an extended distance to indicate an escape route in subdued lighting conditions.
Downsource from the laser 20, each of the side-emitting optical fibres 14 is optically connected by a respective optical waveguide 26 of appropriate length to a respective input of a ten-channel light monitor 28 which serves to monitor the correct illumination of each of the fibres 14 in sequence. In the event of illumination failure in any part of the array 12 (eg, due to breakage of any of the fibres 14 or 16) the monitor 28 can be arranged to give an appropriate alarm signal.
Modifications and variations of the above-described embodiment can be adopted without departing from the scope of the invention.
In a further modification the system is adapted to provide audio tones. In this modification a housing or
box is fitted to sections of the side emitting fibre. As the length of fibre within the housing becomes illuminated, a light sensitive element within the housing causes operation of a tone generator resulting in a tone being emitted from the housing. By setting the tone from each sequential box to a constant level, there is generated the effect of sound travelling towards or away from the listener as the light "steps" along the fibre .
The tone generating system may include a filter arrangement whereby the tone generating system is activated only by the light emanating from the side emitting fibres .
In a yet further modification, the system is fed from a fire detection system to alter the scan direction. The effect of this is that the directional information (either audible or visible) is directed to maximise the escape route information.
Claims
1 An illumination system comprising light source means, side-emitting optical fibre means, and substantially non-dissipative optical waveguide means optically coupling the light source means to the side- emitting optical fibre means whereby in operation of the illumination system, light originating in the light source means is conveyed by the optical waveguide means to the side-emitting optical fibre means to be radiated therefrom.
2 A system as claimed in Claim 1 wherein the light source means comprises a lamp or other light-emitting means.
3 A system as claimed in either preceding claim, wherein the light source comprises a laser.
4 A system as claimed in Claim 3 wherein the laser emits light of a visible wavelength.
5 A system as claimed in Claim 3, wherein the laser emits light of a non-visible wavelength which may subsequently be transformed to visible light.
6 A system as claimed in any preceding claim, wherein the optical waveguide means comprises light-transmitting optical fibre means.
7 A system as claimed in any preceding claim, wherein the optical waveguide means has substantial length, for example, up to 1 kilometre.
8 A system as claimed in any preceding claim, wherein the illumination system comprises a plurality
of side-emitting optical fibres each coupled to the light source means by a respective light-transmitting optical fibre which is substantially non-dissipative relative to the side-emitting optical fibre.
9 A system as claimed in Claim 8, wherein the plurality of side-emitting optical fibres is disposed in a common array.
10 A system as claimed in Claim 8, wherein the plurality of side-emitting optical fibres is disposed in a mutually independent manner.
11 A system as claimed in any one of Claims 8 to 10, wherein the illumination system further comprises sequential scanning means interposed between the light source means and the plurality of light-transmitting optical fibres whereby in operation of the illumination system, the light-transmitting optical fibres are intermittently coupled to the light source means in sequence and the respective side-emitting optical fibres intermittently radiate light in sequence.
12 A system as claimed in Claim 9 wherein the side-emitting optical fibres are disposed in a common array, the array being elongate with the side-emitting optical fibres being disposed at staggered locations along the array whereby in operation, the arrangements cause a visible travelling wave effect.
13 An illumination system comprising side-emitting optical fibre means having a first end and a second end, a first light source means, first substantially non-dissipative optical waveguide means optically coupling the first light source means to the first end of the side-emitting optical fibre means, a second
light source means, second substantially non- dissipative optical waveguide means optically coupling the second light source means to the second end of the side-emitting optical fibre means, control means for controlling operation of the first and second light source means, first light monitoring means for monitoring receipt of light from the first light source means at the second end of the side-emitting optical fibre means and/or at the end of the second optical waveguide means remote from the second end of the side- emitting optical fibre means when the control means functions to control light production by the first light source means, and second light monitoring means for monitoring receipt of light from the second light source means at the first end of the side-emitting optical fibre means and/or at the end of the first optical waveguide means remote from the first end of the side-emitting optical fibre means when the control means functions to control light production by the second light source means.
14 A system as claimed in Claim 13, wherein operation of the illumination system is monitored for continuity of illumination and for possible breaks in any light transmission path.
15 An illumination system comprising side-emitting optical fibre means and light transformation means disposed in relation to the side-emitting optical fibre means as to transform in a predetermined manner light emitted by the side-emitting optical fibre means.
16 A system as claimed in Claim 15, wherein the light transformation means comprises a coating or a sheath surrounding the side-emitting optical fibre means, the coating or sheath comprising material having optical
properties which transform light emitted by the side- emitting optical fibre means in said predetermined manner .
17 A system as claimed in either Claim 15 or Claim 16, wherein the transformation comprises attenuation of undesirable frequencies.
18 A system as claimed in either Claim 15 or Claim 16, wherein the transformation comprises conversion of at least part of emitted light from emitted light of a less visible wavelength to light of a more visible wavelength.
19 A system as claimed in Claim 16, wherein the coating or sheath comprises a fluorescent material which converts an infra-red component of fibre-emitted light to externally visible light.
20 An illumination system comprising a side-emitting optical fibre, mounting means for mounting the fibre in an arrangement that illuminates a predetermined area with light emitted by the fibre when the fibre is supplied with light at one or both ends thereof, and masking means for masking the illuminated area with a predetermined pattern.
21 A system as claimed in Claim 20, wherein the predetermined pattern comprises representations of one or more symbols (eg, an arrow) , and/or one or more icons (eg, a running person) and/or one or more strings of alpha-numeric characters (eg, the words "EMERGENCY EXIT") .
22 A system as claimed in either Claim 20 or Claim 21, wherein the mounting means comprises a sheet of
transparent or translucent material having a channel formed in one face thereof to extend across at least said predetermined area, the optical fibre being disposed in said channel and optically coupled to the material of the sheet by means of an index matching material substantially filling the remainder of the channel around the fibre.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU43801/99A AU4380199A (en) | 1998-06-19 | 1999-06-15 | Illumination system |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB9813182.4A GB9813182D0 (en) | 1998-06-19 | 1998-06-19 | Illumination system |
| GB9813182.4 | 1998-06-19 | ||
| GBGB9822637.6A GB9822637D0 (en) | 1998-10-17 | 1998-10-17 | Illumination system |
| GB9822637.6 | 1998-10-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1999066258A1 true WO1999066258A1 (en) | 1999-12-23 |
Family
ID=26313895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/GB1999/001900 WO1999066258A1 (en) | 1998-06-19 | 1999-06-15 | Illumination system |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU4380199A (en) |
| WO (1) | WO1999066258A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101839407A (en) * | 2009-03-18 | 2010-09-22 | 索尼公司 | Fiber lamp, backlight and LCD |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4052120A (en) * | 1975-02-26 | 1977-10-04 | Erwin Sick Optik-Elektronik | Optical apparatus for producing a light curtain |
| EP0273311A2 (en) * | 1987-01-02 | 1988-07-06 | Fiberstars, Inc. | Lighting apparatus and method |
| US4815815A (en) * | 1979-11-13 | 1989-03-28 | Kei Mori | Device and a method of directing light energy to a predetermined area in the sea |
| WO1992009909A1 (en) * | 1990-11-23 | 1992-06-11 | Bechelani Jean Francois | Fibre-optical light-emitting device and method for using same |
| US5347437A (en) * | 1993-06-11 | 1994-09-13 | Cocca Lorraine A | Electronic jewelry with inscribed fiber optic tail |
| WO1997008490A1 (en) * | 1995-08-23 | 1997-03-06 | Minnesota Mining And Manufacturing Company | Structured surface light extraction overlay and illumination system |
-
1999
- 1999-06-15 WO PCT/GB1999/001900 patent/WO1999066258A1/en active Application Filing
- 1999-06-15 AU AU43801/99A patent/AU4380199A/en not_active Abandoned
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4052120A (en) * | 1975-02-26 | 1977-10-04 | Erwin Sick Optik-Elektronik | Optical apparatus for producing a light curtain |
| US4815815A (en) * | 1979-11-13 | 1989-03-28 | Kei Mori | Device and a method of directing light energy to a predetermined area in the sea |
| EP0273311A2 (en) * | 1987-01-02 | 1988-07-06 | Fiberstars, Inc. | Lighting apparatus and method |
| WO1992009909A1 (en) * | 1990-11-23 | 1992-06-11 | Bechelani Jean Francois | Fibre-optical light-emitting device and method for using same |
| US5347437A (en) * | 1993-06-11 | 1994-09-13 | Cocca Lorraine A | Electronic jewelry with inscribed fiber optic tail |
| WO1997008490A1 (en) * | 1995-08-23 | 1997-03-06 | Minnesota Mining And Manufacturing Company | Structured surface light extraction overlay and illumination system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101839407A (en) * | 2009-03-18 | 2010-09-22 | 索尼公司 | Fiber lamp, backlight and LCD |
Also Published As
| Publication number | Publication date |
|---|---|
| AU4380199A (en) | 2000-01-05 |
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