EP3170040A2 - Fibre à lumière latérale - Google Patents

Fibre à lumière latérale

Info

Publication number
EP3170040A2
EP3170040A2 EP15753617.8A EP15753617A EP3170040A2 EP 3170040 A2 EP3170040 A2 EP 3170040A2 EP 15753617 A EP15753617 A EP 15753617A EP 3170040 A2 EP3170040 A2 EP 3170040A2
Authority
EP
European Patent Office
Prior art keywords
fiber
optical means
radiation
light
sidelight
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP15753617.8A
Other languages
German (de)
English (en)
Inventor
Christian-Alexander Bunge
Markus Beckers
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutsche Telekom AG
Original Assignee
Deutsche Telekom AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Deutsche Telekom AG filed Critical Deutsche Telekom AG
Publication of EP3170040A2 publication Critical patent/EP3170040A2/fr
Withdrawn legal-status Critical Current

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
    • 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
    • G02B6/0003—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 doped with fluorescent agents

Definitions

  • the invention relates to a side light fiber.
  • planar light source In lighting technology, a development has been taking place for some years now towards flat light sources, which can be arranged almost arbitrarily.
  • the simplest form of a planar light source is a two-dimensional arrangement of light-emitting diodes or other active light sources. Even if one can approximately produce a surface illumination with this approach, it is nevertheless still a matrix-like arrangement of point sources, which can be used, for example. B. must be provided with another diffuser to achieve an actual homogeneous distribution.
  • Another approach would be the use of fluorescent lamps that can radiate uniformly, but are usually large and unwieldy.
  • Side light fibers are primarily used in lighting technology or optical metrology. With these sidelight fibers special illumination of surfaces and the design of special flat light sources are possible. In the field of illumination and also in optical measuring technology, a homogeneous illumination of a surface is usually desired. In this case, the light emerging laterally (radially to the main propagation direction of the fiber) is used specifically for illumination purposes.
  • EP 0 956 472 B1 discloses a side optical fiber in which the outward coupling of the light is based on targeted scattering of light.
  • the fiber is defined with optical elements on whose surface the light propagating in the fiber is reflected. The reflected light then exits radially out of the fiber.
  • the emitted light is solely based on the fact that the incident light is reflected or scattered along the fiber, the fiber always has the same emission characteristic. It is not possible to dynamically change the longitudinal distribution of the scattering in the fiber. Also, the choice of different light sources at the fiber end changes the
  • US 201 1/0305035 A1 discloses a further side light fiber, wherein nanoparticles of material are embedded in the core of the fiber, which allows a homogeneous radiation by scattering.
  • the core-sheath boundary layer of the fiber is specially prepared so that light can escape there.
  • the transition can be roughened or formed with special geometries that influence the radiation characteristic of the fiber.
  • US Pat. No. 5,579,429 A discloses another side-light fiber in which particles of fluorescent material are embedded in the core of the fiber. Now meets light of a certain
  • Wavelength on the fluorescent particles so they give off a light of different wavelength, which passes through the boundary layer of the core and leaves the fiber as a sidelight.
  • the existing methods of generating sidelobes in optical fibers are relatively simple to implement, but have the disadvantage of being static.
  • the sidelight radiation can not be varied during operation.
  • scattering also occurs in fibers doped with fluorescent dyes. so that they would always shine along the fiber.
  • the known sidelight fibers are quite static in their light characteristics. During operation, only similar light patterns are displayed. At most, the color of the sidelight radiation can be varied during operation by the change in the color of the stimulation radiation, provided that the emission of the sidelight radiation is based on purely optical phenomena.
  • the object of the present invention is to provide a sidelight fiber which can be used to produce flexible lighting effects.
  • the object underlying the invention is achieved by a side light fiber according to claim 1 and the Use of such a fiber according to claims 6 and 9, preferred
  • the side-light fiber comprises a photoconductive core aligned along a main propagation direction, optical means disposed in or on the core and for emitting visible lateral radiation in the radial direction when the optical means are illuminated by stimulation radiation which is located in the nucleus
  • Main propagation direction is spreading.
  • optical means There are two types of optical means provided, namely first optical means and second optical means, wherein the first and second optical means each by deviating excitation radiation for the delivery of
  • the invention is based on the combined use of several light effects within a fiber, which react differently to incident light, namely the stimulation radiation.
  • the luminous effects used can, for example, be scattering centers as optical means along a fiber whose distribution in the fiber cross-section and along the fiber is adapted to the desired effect.
  • Other luminous effects can be realized, for example, by fluorescent substances within the fiber as other optical means. These can be excited, for example, with short-wave light.
  • the emission characteristic of the same fiber can be generated, in particular, by different excitation light, to which the optical means "react differently.”
  • light sources of different wavelengths are suitable for generating the excitation radiation, which can be used to selectively switch the emitted ones
  • Modal distribution for example due to changes in the coupling-in conditions, can be used for the targeted generation of different luminous effects.
  • the optical means may be formed by optically scattering structures.
  • scattering is to be understood broadly and includes the reflection and refraction of optical waves.
  • the optically scattering structures result in a significant change of at least parts of the structures impinging on the structures Light beams. In this case, only the direction of propagation of the light of the excitation radiation is changed in such a way that the light guided in the fiber can partially emerge laterally out of the fiber. This exiting light is then the emitted side light radiation.
  • Scattering can be adjusted by targeted preparation of the fiber. By the strength of the scattering, one can control the amount of sidelight radiation at the respective location.
  • These structures can be provided with color filters. It is possible a variety of brightness distributions along the fiber, the excitation radiation must be irradiated only at one point in the fiber and thus only at this point a power supply must be present.
  • the optical means may comprise luminescent, in particular fluorescent particles, which comprises a doping with luminescent elements.
  • the particles are excited by absorption of a portion of the incident light and assume higher energy states. Following this, the absorbed additional energy is released again in the form of the lateral radiation. This process is called spontaneous emission.
  • spontaneous emission Depending on how long the luminescent particles on their respective higher
  • Wavelength conversion instead, because usually not all of the absorbed energy can be completely released and so light with a little lower energy, so longer wavelengths emitted.
  • This has the advantage that the energy supply can be made with invisible light, but the fiber itself radiates visible light.
  • Another advantage of this method is the emission direction of the light. While scattered light usually continues to have a preferential propagation direction similar to the original propagation direction, the light emitted by the optical means results in isotropic emission by means of spontaneous emission. As a result, the light is radiated the same in almost all directions.
  • Switch lights on at one point of the fiber For this purpose, according to the prior art, two different fibers would hitherto be required.
  • the first optical means are formed by luminescent particles, while the second optical means are formed by optical scattering structures, in particular particles or surfaces.
  • the first optical means are formed by first luminescent particles, while the second optical means are formed by different second luminescent particles.
  • the luminescent particles are preferably arranged in the core. It is further preferred that no further scattering particles are arranged at this point in the core. Because while scattering particles generate side light as soon as they are exposed to stimulation radiation, luminescent particles only generate side light radiation when the stimulating radiation is adapted in its wavelength to the luminescent particles. Thus, generally in one area, the generation of the
  • Side light radiation can be selectively switched on or off by selecting the wavelength of the stimulation radiation.
  • individual areas can also be completely darkened.
  • a first local area of the side light fiber is formed, in which first and second optical means in another
  • Amount ratio are present as in a second local area.
  • the individual areas can be specifically illuminated with different color mixtures.
  • exclusively first optical means or exclusively second optical means are arranged in a first local area of the side-light fiber.
  • the side light fiber is used according to the invention to change the light emission of the side light fiber by changing the stimulation radiation.
  • the stimulation radiation is changed, whereby those optical means are selected which emit visible side light radiation.
  • the stimulation radiation can be changed, whereby a change of those optical means is made, which emit visible side light radiation.
  • the sidelight fiber according to the invention can also be used for the production of textile structures, in particular by weaving, braiding, laying, knitting or knitting.
  • the sidelight fiber is thus virtually the yarn for their production or can be embedded in such textiles. So can light mats with a wide
  • FIG. 1 shows a side light fiber according to the invention in partial section
  • FIG. 2 shows the cross section of a first side-light fiber according to the invention in a first operating state
  • FIG. 3 shows the cross section of the first side-light fiber according to the invention in a second operating state
  • FIG. 4 shows the cross section of the first side-light fiber according to the invention in a third operating state
  • FIG. 5 shows the cross section of a second side-light fiber according to the invention in a first operating state
  • FIG. 6 shows the cross section of the second side-light fiber according to the invention in a second operating state
  • FIG. 7 shows the cross section of the second side-light fiber according to the invention in a third operating state
  • FIG. 8 shows a luminous mat produced with a multiplicity of inventive devices
  • FIG. 1 shows a side light fiber 1 in partial section.
  • the side light fiber 1 has a core 2 defining a main propagation direction M.
  • the core 2 is enclosed by a jacket 3, which is arranged coaxially around the core 2 and is part of the side-light fiber 1.
  • an excitation radiation 4 propagates. This is reflected at a boundary layer 6 between the core 2 and the jacket 3, so that the exciting radiation 4 is largely subject to total reflection.
  • sidelight 5 can emerge radially from the fiber 1 toward the main propagation direction M when the light strikes particles 1 1, 12 within fiber. These particles optically scatter parts of the stimulation radiation.
  • the optical means 11, 12 are constituted by fluorescent particles formed by
  • Stimulation radiation 1 of a certain wavelength for active lighting in a different wavelength can be brought.
  • the now proposed sidelight fiber is based on the idea of using two different optical means for generating sidelight radiation in combination in a sidelight fiber, wherein the two optical means each respond to other wavelengths of the excitation radiation.
  • the two optical means can be arranged so that at least one of the two means reacts only to a different stimulation radiation than the respective other optical means.
  • the exciting radiation can be selectively used to excite one of the optical means while the other optical means remains inactive at that moment and does not emit sidelight radiation.
  • FIG. 2 shows a preferred side-light fiber with fluorescent particles 11 as first optical means in a first region 7 of the side-light fiber 1 in conjunction with scattering, in particular reflective particles 12 as second optical means, which are arranged exclusively in a second region 8 of the side-light fiber 1 none
  • Fluorescent particles 1 1 are provided.
  • the fluorescent particles 11 react only due to the specific absorption
  • UV light 4 as used in FIG. 2 as an emission radiation, is therefore suitable for the excitation of the fluorescence particles 1 1. If the UV light 4 hits a fluorescence particle 11, it generates such this also light rays that break through the boundary layer 6 of the core 2 and emerge as solichstrahlung 5 «from the side light fiber 1.
  • Fluorescent particles 11 are not excited to active glow and thus give off any scattered light on them, which can be neglected in the present case. If the visible light 4 2 strikes a reflective particle 12, this particle 12 reflects the visible light of the stimulation radiation and emits it as visible side light 5 2 .
  • the first area 7 can be visibly illuminated; by irradiation of visible light 4 2 as an excitation radiation, the second area 8 can be visibly illuminated.
  • the second area 8 can be visibly illuminated.
  • both regions 7 can be visibly illuminated.
  • the reflecting particles it is also possible to use other optical means which divert the incident stimulating radiation at least partially in another direction, at least by reflection or refraction.
  • particles arranged in the core particles at the edge of the core, roughening of the edge or intended damage to the core are also used.
  • Fluorescent particles in the core essentially generate side light radiation only when they are excited with a corresponding excitation radiation.
  • Fluorescent particles generate by scattering at most negligible sidelight radiation. In contrast, optically scattering particles always produce side light radiation in the nucleus, provided stimulating radiation hits these particles. Due to the defined use of fluorescent particles in the core, individual areas of the fiber can thus be darkened or illuminated in a targeted manner, even if visible light is used as the stimulating radiation.
  • second different fluorescent particles 12 different from the (first) luminescent particles 11 of the first optical means may be used as the second optical means. This means that the second luminescent particles react to a different starting radiation than the first luminescent particles.
  • Figures 2 to 4 are then to be understood accordingly, with the proviso that the second stimulating radiation 4 2 is also an invisible light, for example, a UV light other wavelength than the UV light 4 ,.
  • the non-visible reflection and generation of the side light radiation 5i on the particle 12 by first UV radiation 4 shown in FIG. 2 is omitted in this case.
  • the second area 8 can be completely darkened, even in the case where the stimulating radiation 4 is visible light.
  • FIGS. 5 to 7 An advantageous further development of the side-light fibers according to the invention is the targeted use of the selectability of the emission color in fluorescence, which is explained with reference to FIGS. 5 to 7. Again, the two areas 7 and 8 are shown, wherein both first luminescent particles 11 and second luminescent particles 12 are present in both areas. In the first region 7, however, the concentration of first particles 11 is greater than that of second particles 12, while in the second region 8 it is reversed.
  • Sidelight radiation 5i ab when a first UV light 4 is irradiated into the side light fiber 1; the second particles 12 emit only side light radiation 5 2 when a second UV light 4 2 of different wavelength is irradiated into the side light fiber 1.
  • the first particles 11 quinine
  • the second particles 12 rhodamine
  • Other fluorescent substances can be taken from the literature, eg Wikipedia, article “Fluorescence”, section “Fluorescent Dyes (Selection)”.
  • first UV light 4 introduced into the side light fiber 1
  • the first area 7 shines bright blue due to the high concentration of the first particle 1
  • the second area 8 shines weak blue due to the low concentration of the first particle 1 1 ( Figure 5).
  • the sidelight radiation can be changed in its color.
  • the color of the emitted light is in luminescence only by the difference in energy levels between excited and
  • the color of the emitted light can be adjusted independently of the wavelength or color of the exciting light.
  • the fiber shine in different places with a different color by locally
  • a preferred application of the fibers according to the invention are, for example, luminous substances produced by textile surface-forming processes.
  • the production can
  • FIG. 8 shows such a configuration.
  • the first region 7 extends almost over the entire surface of the fabric; the second area 8 is quite small compared to it, wherein the first area may also overlap the second area.
  • first particles 1 1 are arranged in a rather low concentration, which emit a dim warm white ambient light.
  • second particles 12 are arranged in a fairly high concentration, which emit a fairly strong light, so that a kind of reading lamp is created. By changing the stimulation radiation, the reading lamp can now be switched on instead of the ambient light.
  • the first particles 1 1 in the first region 7 and the second particles 12 in the second region 8 are formed by luminescent particles which are arranged in the core 2. If only the first stimulating radiation 4 is initiated, then the second region 8 remains dark, only the first region 7 emits side light radiation 5, from. Will only be the times
  • Initiating radiation 4 2 initiates, the first regions 7 remains dark, only the second region 8 emits sidelight radiation 5 2 . This also applies if the respective stimulating radiations comprise visible light.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

Fibre à lumière latérale (1) comprenant une âme (2) qui conduit la lumière et est orientée dans une direction d'extension principale (M), et des moyens optiques (11, 12) disposés dans ou sur l'âme et destinés à émettre un rayonnement de lumière latérale visible (5) dans la direction radiale lorsque les éléments optiques (11, 12) sont exposés à un rayonnement d'excitation (4) qui se propage dans l'âme dans la direction d'extension principale (M), les éléments optiques comprenant de premiers éléments optiques (11) et de seconds éléments optiques (12), les premiers et les seconds éléments optiques (11, 12) étant amenés à émettre un rayonnement de lumière latérale (51, 52) sous l'effet d'un rayonnement d'excitation (41, 42) respectivement différent.
EP15753617.8A 2014-07-18 2015-07-17 Fibre à lumière latérale Withdrawn EP3170040A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014110120.0A DE102014110120A1 (de) 2014-07-18 2014-07-18 Seitenlichtfaser
PCT/EP2015/066423 WO2016009045A2 (fr) 2014-07-18 2015-07-17 Fibre à lumière latérale

Publications (1)

Publication Number Publication Date
EP3170040A2 true EP3170040A2 (fr) 2017-05-24

Family

ID=53938297

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15753617.8A Withdrawn EP3170040A2 (fr) 2014-07-18 2015-07-17 Fibre à lumière latérale

Country Status (3)

Country Link
EP (1) EP3170040A2 (fr)
DE (1) DE102014110120A1 (fr)
WO (1) WO2016009045A2 (fr)

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DE102016003812A1 (de) * 2016-03-26 2017-09-28 Audi Ag Faserkunststoffverbundbauteil mit integriertem Leuchtmittel und Verfahren zu dessen Herstellung
DE102017108698A1 (de) * 2017-04-24 2018-10-25 Osram Gmbh Optoelektronisches Bauelement
DE102017129978A1 (de) * 2017-12-14 2019-06-19 Schott Ag Linienförmige Lichtquelle
DE102018127753A1 (de) * 2018-11-07 2020-05-07 Strick Zella GmbH & Co. KG Leuchtenanordnung für Textilien
DE102020101813A1 (de) 2019-01-29 2020-07-30 Schott Ag Linienleuchte
DE102020100058A1 (de) 2020-01-03 2021-07-08 Leoni Kabel Gmbh Faseroptische Temperaturmessung mit Quantendot-Nanokomposit

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WO2007084785A2 (fr) * 2006-01-20 2007-07-26 Massachusetts Institute Of Technology Laser à fibre à émission par la surface
WO2012146960A1 (fr) * 2011-04-28 2012-11-01 Tissot Yann Dispositif de guide d'ondes pour systèmes d'éclairage

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US5845038A (en) 1997-01-28 1998-12-01 Minnesota Mining And Manufacturing Company Optical fiber illumination system
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JP2006071776A (ja) * 2004-08-31 2006-03-16 Sharp Corp 光ファイバ型発光体およびこれを備える照明装置
US20080019659A1 (en) * 2005-10-26 2008-01-24 Xiaoming Tao Photonic fabric display with controlled graphic pattern, color, luminescence intensity, and light self-amplification
WO2009126836A1 (fr) * 2008-04-09 2009-10-15 Ventures, Khosla Dispositifs électroluminescents et procédés associés
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JP6052779B2 (ja) 2009-11-20 2016-12-27 コーニング インコーポレイテッド 側面発光フォトニック光ファイバーを備えた照明システム及びその製造方法
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Publication number Priority date Publication date Assignee Title
WO2007084785A2 (fr) * 2006-01-20 2007-07-26 Massachusetts Institute Of Technology Laser à fibre à émission par la surface
WO2012146960A1 (fr) * 2011-04-28 2012-11-01 Tissot Yann Dispositif de guide d'ondes pour systèmes d'éclairage

Also Published As

Publication number Publication date
DE102014110120A1 (de) 2016-01-21
WO2016009045A3 (fr) 2016-03-24
WO2016009045A2 (fr) 2016-01-21

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