WO2012123039A1 - Leuchtelement - Google Patents
Leuchtelement Download PDFInfo
- Publication number
- WO2012123039A1 WO2012123039A1 PCT/EP2011/071472 EP2011071472W WO2012123039A1 WO 2012123039 A1 WO2012123039 A1 WO 2012123039A1 EP 2011071472 W EP2011071472 W EP 2011071472W WO 2012123039 A1 WO2012123039 A1 WO 2012123039A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light
- luminous element
- element according
- emitting
- conducting body
- 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
- G02B6/0011—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 planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
- G02B6/0021—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces for housing at least a part of the light source, e.g. by forming holes or recesses
-
- 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
- G02B6/0011—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 planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
- G02B6/006—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to produce indicia, symbols, texts or the like
Definitions
- the invention relates to a luminous element.
- the luminous element according to the invention may for example be part of a cladding, such as a window or door trim, a veneer, a formwork, a profile strip or a sealing profile preferably in a water, air or land vehicle or in a building.
- a cladding such as a window or door trim, a veneer, a formwork, a profile strip or a sealing profile preferably in a water, air or land vehicle or in a building.
- it may be a contour lighting for decorative purposes or a backlight of controls or lettering.
- Side-emitting fibers or optical fibers are distinguished by the fact that they are not intended to transmit the coupled-in light radiation from the coupling-in side to the coupling-out side, but rather to radiate the light radiation as homogeneously as possible over its length.
- Side-emitting fibers or optical fibers are known, for example, from WO 2009/140025 A2, in which core-sheath fibers with scattering particles in the core and sheath, preferably based on polymers, are disclosed. Due to the fiber diameter in the range of a few mm, a polymer-based light guide typically has a single side-emitting fiber and a relatively high minimum bend radius.
- Side emitting fibers are further known from WO2009 / 100834 based on glass core-sheath fibers, wherein the glass fibers typically have a diameter of 30 ⁇ m to 100 ⁇ m and a side-emitting optical fiber typically comprises a fiber bundle with a plurality of such fibers.
- a side-emitting optical fiber typically comprises a fiber bundle with a plurality of such fibers.
- such optical fibers are distinguished, inter alia, by smaller bending radii compared to polymer fibers.
- contour lighting with a side-emitting light guide as a rule only one light source is required, with which light radiation is coupled into the side-emitting light guide, wherein the side-emitting light guide decouples light radiation along at least part of its length over the lateral surface.
- Such contour lighting is proposed, for example, in EP 0988179, wherein a side-emitting light guide extends in a light-transmitting hollow part with fastening lugs, so that fastening of the light guide along the contour is made possible.
- a disadvantage of this solution is that the side-emitting light guide is relatively poorly mechanically protected by the translucent hollow part and can be damaged by force.
- a further disadvantage is that a uniform contour illumination is only achieved if the light guide uniform over its length shines brightly and does not have brighter or darker areas.
- punctually brighter areas are not a special feature.
- polymer fibers with a diameter of a few mm for example, these can be caused by narrow bending radii, unevenly distributed scattering centers or by mechanical damage.
- broken individual fibers for example, can represent disturbing light spots.
- the object of the invention is to provide a luminous element, in particular a luminous element with a contour lighting, which overcomes the disadvantages of the prior art and which is characterized by a high uniformity, high robustness to mechanical forces and low maintenance.
- the lighting element should also be used in fire-protected areas such as an aircraft and also three-dimensionally extending contour lines with very low bending radii of about 5 mm can follow.
- the luminous element according to the invention comprises an elongated side-emitting optical waveguide and a light-conducting body, wherein the side-emitting optical waveguide has at least one end face for the coupling of light radiation and decouples light radiation in the operating state at least over a portion of its length and wherein the light-conducting body has a surface with an elongated recess for receiving of the side-emitting optical waveguide and with at least one outcoupling region for the outcoupling of light from the light-guiding body, and wherein the side-emitting optical waveguide extends at least in sections in the elongated depression, so that the light radiation emerging from the side-emitting optical waveguide at least partially coupled through the inner surface of the elongated recess in the photoconductive body.
- light radiation is coupled into the light-conducting body via the side-emitting light guide, which radiation is guided at least partially directly or via one or more reflections to the at least one coupling-out region.
- the light-conducting body has a multiple function. On the one hand, it has a homogenizing function, since the radiation emerging from the light guide is homogenized within the light-conducting body. Punctually lighter areas of the side emitting light guide can thus generally be avoided in the decoupling area.
- the light-conducting body has a protective function. The side emitting light guide is protected in the elongated recess from mechanical effects.
- the light-conducting body may be a separate component of a contour lighting, but the light-conducting body can be particularly advantageously already part of an element with a contour to be illuminated.
- Interior linings of aircraft windows for example, partially made of transparent, thermoformed plastic sheets of a thickness of about 3 to 5 mm, which are coated on the inside of the cabin and are uncoated on its peripheral side surface.
- the light-conducting body is to be understood as meaning a body which is transparent at least for a fraction of the coupled-in light radiation. It may be, for example, a transparent or colored glass or plastic disc.
- the elongated recess for receiving the side-emitting optical fiber is preferably so deep that the side-emitting optical fiber can be completely absorbed by the latter. It may have a rectilinear or curved course and, in accordance with the surface profile of the light-guiding body, may also be three-dimensional.
- the elongated recess can be introduced either directly in the manufacture of the light-conducting body in these, for example, by extrusion, profile pressing, deep drawing or else subsequently introduced by material-removing methods such as milling, cutting or similar in these.
- the side-emitting light guide can be any elongate light guide, for example based on polymer or glass fibers.
- the radiation of a side-emitting light guide is generally caused by a targeted disturbance of the light pipe.
- scattering particles can be introduced into the light-conducting medium or disturbances of the total reflection caused by deformations of the totally reflecting surfaces.
- a side emitting light pipe may comprise one or more side emitting fibers.
- Such fibers typically include a photoconductive core of a high refractive index, photoconductive material and a cladding of a low refractive index material surrounding the core, such that light radiation is directed through the fiber by total reflection at the core / cladding interface.
- the decoupling may, for example, be caused by scattering centers in the photoconductive core or at the core-cladding interface. With uniform distribution of the scattering gradient density over the optical fiber length, the laterally emitted light quantity per unit length decreases approximately exponentially with the distance from the coupling-in surface.
- the scatter density can be selected depending on the length of the geometry to be illuminated so that the side-emitting light guide radiates a sufficiently constant amount of light per unit length over its entire length.
- the light-conducting base material of the optical waveguide of the light-conducting core material must have a sufficiently low attenuation in order to allow sufficient radiation in the sections of the side-emitting optical waveguide remote from the light source and to couple sufficient light into the light-conducting body.
- the attenuation of the light-conducting base material of the light guide without scattering centers should therefore be at a maximum wavelength of 550 nm 5 dB / m, optimally ⁇ 0.5 dB / m.
- the base material of the light-conducting body can have a significantly higher attenuation since the light in it is typically transmitted only over a few cm or less to the at least one outcoupling surface.
- the attenuation may well be in the range of around or below 5 dB / cm, which is usually achieved by transparent plastics and glasses in normal, non-high purity qualities.
- the use of the side emitting light guide with a low attenuation therefore advantageously allows the combination with inexpensive transparent plastics or glasses whose transparency plays a minor role.
- the base material of the light-conducting body would have to have a correspondingly lower attenuation.
- the integration of the light-emitting element into existing claddings of transparent plastic materials would thus not be readily possible, for example, since the plastic materials commonly used in this area generally do not have sufficient transparency.
- the side-emitting light guide comprises a fiber bundle with a plurality of side-emitting glass fibers, which are surrounded by a tubular, transparent jacket, so that decouples light radiation from the outer surface of the shell in the operating state.
- Particularly suitable are glass fibers according to the patent application WO
- the individual fibers preferably have a diameter of 30 to 100 pm.
- Such glass fibers are distinguished, in contrast to thicker polymer fibers, by very small minimum bending radii in the range of approximately 0.5 to 10 mm, whereby even with narrow bends not significantly more light is coupled out of these fibers, as is the case with polymer fibers.
- glass fibers have a higher thermal and chemical resistance and are not combustible, which is for use e.g. in plane is of importance.
- the fiber bundle may typically comprise from about 10 to a few thousand fibers.
- the diameter of the fiber bundle is typically 0, 1 to 5 mm, depending on the element to be illuminated.
- the fiber bundle may be surrounded by a tubular transparent jacket, which holds the bundle together and ensures easy mounting of the light guide in the elongated recess of the light-conducting body.
- the transparent jacket may e.g. Silicone, PTFE or PVC include.
- the fiber bundle does not have to have a jacket and can also be arranged in the elongated depression without a further protective sheath. The cohesion of the fiber bundle can then be achieved, for example, by twisting the bundle.
- a transparent, curable potting compound such as epoxy resin or silicone is possible.
- the side-emitting optical waveguide preferably has at its ends a respective end face into which light radiation can be coupled by means of a light source.
- the two end faces are combined to form a common end face, so that with a light source on both sides light in the side emitting light guide can be coupled.
- the uniformity of the radiated light radiation over the optical fiber length can be improved compared to a one-sided light coupling.
- the light guide comprises a fiber bundle
- the fibers for light coupling are generally gathered, glued, ground and polished in a sleeve.
- the light source may be any light source such as a halogen light source, a metal vapor discharge lamp or an LED light source whose radiation can be well focused. Particularly preferably, it is a monochromatic LED light source or an LED light source with white or adjustable light color, so that the color of the light emitting element is variably adjustable.
- the light source can be integrated into the luminous element or arranged outside the luminous element as a separate, exchangeable unit.
- the side-emitting light guide is flexible and the light-conducting body is rigid. If the light-conducting body is part of an element with a contour to be illuminated, such as the inner lining of an aircraft window, the light-conducting body usually has a predetermined rigid shape with a two-dimensional contour of any shape or even a three-dimensional shape of any spatial shape. By means of a flexible form of the side-emitting light guide, this can follow an arbitrarily two- or three-dimensionally extending contour and can be easily mounted and fixed in the oblong depression.
- the elongated recess preferably has a cross-sectional shape corresponding to the side-emitting optical waveguide.
- the forms of optical fiber and elongated depression must be favorable in terms of manufacturing technology.
- the optical fiber may have a circular outer geometry and the elongated recess may have a U-shaped cross-sectional shape.
- the inner surface of the elongated recess preferably has a polished surface quality, thereby avoiding air pockets or layers of air between the light pipe and the inner surface of the recess and undesirable reflections or scattering effects.
- a transparent medium for reducing reflection losses may be disposed between the inner surface of the elongated recess and the side emitting optical fiber.
- the side-emitting light guide can be glued with an epoxy resin or a silicone in the elongated recess, which is preferably introduced in front of the light guide in the elongated recess.
- a mechanical fixation of the light guide in the groove is effected particularly advantageously, so that it is possible to dispense with further fixing means.
- means for fixing the side-emitting light guide may be provided in the elongated recess, in particular when the light guide is not glued or cast in the elongated recess.
- the elongated depression can be closed in sections or completely with an adhesive tape which advantageously has a high reflection at its side facing the depression.
- the cross-sectional profile of the elongated recess may have a constriction at its opening to the surface, so that the light guide can be introduced only under a small force in the light-conducting body and which prevents slipping out.
- on both sides along the opening of the elongated recess elements may be arranged, which prevent slipping out of the light guide.
- the light-conducting body preferably has a light-tight coating on subregions of the surface, which is preferably arranged such that the elongated indentation and the side-emitting light guide arranged at least in sections thereof are not visible to an observer in the operating state of the light-emitting element.
- the elongated recess is disposed in the back of the photoconductive body, which is generally invisible to a viewer, and the front has a light-tight coating that obscures the recess in the back for a viewer.
- the light-tight coating may be, for example, a color or lacquer layer or also a glued-on foil. It can be white or colored.
- the light-tight coating may also have a multilayer structure.
- a white or transparent layer is preferably arranged under the colored layer in order to avoid a color shift of the light radiation reflected within the light-conducting body.
- the applied on the transparent body color layer preferably has a lower refractive index than the photoconductive body in order to improve the reflection properties and to achieve total light reflection via a light pipe.
- the light-conducting effect of the light-conducting body can be greatly reduced by contamination of an uncoated surface.
- the regions of the surface which are not coated with a light-tight coating, in particular the back side of the transparent body, can therefore also have a transparent coating with a low refractive index.
- the uncoated areas of the surface should be protected from contamination during operation of the light-emitting element in order to avoid a decrease in the brightness of the light-emitting element.
- the surface of the light-conducting body is preferably uncoated in the at least one decoupling area and has a scattering or smooth surface, so that light radiation can escape.
- a scattering surface causes a non-directional radiation of light radiation and advantageously prevents insight into the light-conducting body.
- the scattering surface thus acts uniformly bright from different viewing directions.
- a smooth surface of the light entry surface is also possible, which allows a preferred emission direction of the luminous element.
- the light-conducting body may also have a transparent coating in the decoupling area.
- the light-conducting body is formed flat in a partial region comprising at least the coupling-out region and the elongate depression, and the surface comprises a front side, a rear side and a side surface.
- the light-conducting body can then also act as a light guide and transport the radiation over relatively short distances and with correspondingly low losses to the at least one decoupling region.
- the light-conducting body can have any shape and does not necessarily have to have light-conducting properties.
- the light-conducting body may comprise a planar or spatially shaped plastic plate.
- plastic panels are often used in vehicle or building interior linings or cladding and can be shaped three-dimensionally, for example by a forming process.
- they are plastic sheets of a plastic which has an aerospace permit (e.g., LEXAN) and may be used as an interior trim, for example, in an aircraft.
- an aerospace permit e.g., LEXAN
- the plastic plate may preferably have a thickness of 1 mm to 10 mm and preferably 2 mm to 5 mm.
- the thickness of the plastic plate should be about 2 to 5 times the depth of the oblong depression, so that even in the region of the elongated recess of the light-conducting body has sufficient stability.
- the invention can be used particularly advantageously for contour lighting of the light-conducting body, which is explained in more detail below:
- the front side of the light-conducting body has a light-tight coating
- the side surface represents a coupling-out region
- the elongated depression is arranged in the rear side.
- the light radiation emerging from the side surface thus represents a contour illumination of the light-conducting body, wherein the illuminated side surface is visible as a luminous contour, but no light source, for a viewer of the front side.
- the light guide is protected in the back.
- the cross-sectional profile of the side surface of the sheet-like transparent body may be convex, concave or planar, wherein the side surface is also perpendicular or oblique to the front.
- the cross-sectional profile of the side surface may, of course, in addition to the basic shapes described always have production-related form deviations and in particular facets or rounded edges.
- the elongated recess preferably extends at least in sections at a uniform distance from the side surface of the planar transparent body and the distance is between 2 mm and 20 mm and preferably 5 mm to 15 mm. Due to the constant distance a uniformly bright glowing contour is achieved. By the distance of the elongated recess from the side surface is further achieved that the elongated recess and the light guide of the side surface are not visible. Also, for reasons of mechanical stability, the distance of the elongated recess to the side surface should not be too low.
- the ratio of the elongated recess and side surface to the thickness of the photoconductive body in the region of the elongated recess should be about 1: 3 to 1:10. This ensures that elongated recess and light guide for a viewer of the front are generally not visible and on the other side an efficient illumination of the decoupling region is achieved.
- the front side comprises a decoupling area, around which a light-tight coating is arranged.
- the elongate recess is also disposed around this outcoupling area and behind the light-tight coating either in the front or in the back, such that a light guide disposed in the elongated recess is not visible to a viewer of the front.
- the decoupling region arranged on the front side can comprise one or more subsegments and represent, for example, a lettering or a symbol.
- the decoupling area is backlit by the circumferential light guide.
- the surface of the decoupling region can be formed, for example, light-scattering, wherein the back of the photoconductive body can then be uncoated.
- the decoupling area can be smooth.
- the backside preferably has a white or colored light-tight coating, so that a viewer of the front side can not see through the luminous element.
- the lighting element is part of a panel, such as a window or door trim, a veneer, a formwork, a profile strip or a seal, preferably in a water, air or land vehicle or in a building, or in conjunction with a arranged these objects.
- the lighting element is part of a household or kitchen appliance, a piece of furniture such as a table, a cabinet or a seat, or other interior furnishing object, preferably in a water, air or land vehicle or in a building, or in Connection with one of these items arranged.
- Figure 1 Cross-sectional view of a luminous element according to the invention
- Figure 2 Perspective view of a luminous element with a backlit according to the invention lettering
- FIG. 3 Perspective view of an aircraft window interior trim with an integrated lighting element according to the invention
- Figure 1 shows a schematic cross-sectional view through the edge of the light-conducting body of a luminous element (1) according to the invention, wherein the surface of the flat, light-conducting body (2) has a front side (3), a Rear side (4) and a side surface (5).
- a side-emitting optical fiber (10) with a round cross section is arranged in a U-shaped elongated recess (7) with an inner surface (8) on the back (4), which is closed with a cover (1 1).
- the side emitting light guide (10) comprises a bundle of side emitting single fibers (14) and a sheath (15) which encloses the bundle.
- Light radiation can be coupled from the individual fibers through the sheath (15) and the inner surface (8) of the elongated recess (7) in the photoconductive body (2) and directed by reflections on the front or back or directly to the side surface (5) which represents a decoupling area (16) in the illustrated case.
- the cross-sectional profile of the side surface (5) is flat and runs slightly obliquely to the front and back, so that for a viewer of the front side surface (5) is visible.
- the front side has a light-tight coating (17) with a first and a second sub-layer, wherein the layer facing the light-conducting body is white or transparent, and the outer covering layer can also be colored.
- the back is uncoated in the example shown.
- FIG. 2 shows a further embodiment of a luminous element (1) according to the invention with a decoupling region (16) comprising a plurality of subsegments in the form of a lettering, which is backlit according to the invention.
- the light-conducting body (2) has on its front side (3) a light-tight coating (17), the recesses of which represent the multi-segment decoupling region (16).
- Around the decoupling area runs in the back of the elongated recess (7), in which the side-emitting light guide (10) is arranged. The ends of the light guide are led out together from the light-conducting body (2).
- FIG. 3 shows a further embodiment of a luminous element (1) according to the invention. It is a perspective view of an aircraft window interior trim of the operational, not visible to the aircraft occupant back.
- the light-conducting body (2) comprises a deep-drawn plastic element of a transparent plastic, typically a plastic plate of a thickness of about 5 mm and two optical fiber loops.
- a light-tight coating (17) is arranged (not shown).
- first side emitting light guide loop extends in a circumferential elongated recess along the illuminated side surface (5) and a second side emitting light guide loop extends in a second elongated recess which extends around a decoupling area recessed in the light-tight coating (17).
- a lettering or a symbol can advantageously be illuminated indirectly.
- the ends of the first and second optical fiber loop are combined in a sleeve (13) and form there a common coupling surface. The entire light-emitting element can thus be illuminated with a single light source, eg an LED.
- the luminous element according to the invention is distinguished from the prior art by numerous advantages. It allows, for example, a very uniform contour lighting and can be integrated into existing light-conducting elements such as an interior trim.
- the lighting according to the invention has a very small installation depth and can also be integrated into very thin light-conducting plates made of glass or plastic, to the light-conducting properties of which only very low requirements are made.
- the light of the light element is freely adjustable in color.
- the light source can be located spatially at a different location than the light-conducting body, which in turn provides advantages in the installation conditions.
- the light element is in conjunction with a light source corresponding life maintenance free.
- the side-emitting light guide may have punctual brighter or darker areas along its length which do not interfere.
- broken individual fibers in a glass fiber bundle in contrast to a contour lighting with directly visible side emitting light guide no problem.
- the light itself has no current-carrying parts, which is a safety advantage in many applications.
- the luminous element according to the invention can also be used for a very homogeneous backlighting, for example, a lettering or symbol, for example, as a backlighting of an advertising lettering.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Planar Illumination Modules (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112011105045T DE112011105045A5 (de) | 2011-03-17 | 2011-12-01 | Leuchtelement |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011014253.3 | 2011-03-17 | ||
DE102011014253 | 2011-03-17 |
Publications (1)
Publication Number | Publication Date |
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WO2012123039A1 true WO2012123039A1 (de) | 2012-09-20 |
Family
ID=45375291
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2011/071472 WO2012123039A1 (de) | 2011-03-17 | 2011-12-01 | Leuchtelement |
Country Status (2)
Country | Link |
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DE (1) | DE112011105045A5 (de) |
WO (1) | WO2012123039A1 (de) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0988179A1 (de) | 1997-06-10 | 2000-03-29 | Lisa Dräxlmaier GmbH | Inneneinrichtungsgegenstand und verwendung eines lichtwellenleiters als dekorfaden an solchen inneneinrichtungsgegenständen |
EP1865251A1 (de) * | 2005-03-29 | 2007-12-12 | FUJIFILM Corporation | Lichtleitelement, dieses einsetzende planare beleuchtungsvorrichtung und stabartige beleuchtungsvorrichtung |
WO2009100834A1 (de) | 2008-02-14 | 2009-08-20 | Schott Ag | Seitenemittierende stufenindexfaser |
WO2009140025A2 (en) | 2008-05-16 | 2009-11-19 | 3M Innovative Properties Company | Side lighting optical fiber |
-
2011
- 2011-12-01 DE DE112011105045T patent/DE112011105045A5/de not_active Ceased
- 2011-12-01 WO PCT/EP2011/071472 patent/WO2012123039A1/de active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0988179A1 (de) | 1997-06-10 | 2000-03-29 | Lisa Dräxlmaier GmbH | Inneneinrichtungsgegenstand und verwendung eines lichtwellenleiters als dekorfaden an solchen inneneinrichtungsgegenständen |
EP1865251A1 (de) * | 2005-03-29 | 2007-12-12 | FUJIFILM Corporation | Lichtleitelement, dieses einsetzende planare beleuchtungsvorrichtung und stabartige beleuchtungsvorrichtung |
WO2009100834A1 (de) | 2008-02-14 | 2009-08-20 | Schott Ag | Seitenemittierende stufenindexfaser |
WO2009140025A2 (en) | 2008-05-16 | 2009-11-19 | 3M Innovative Properties Company | Side lighting optical fiber |
Also Published As
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DE112011105045A5 (de) | 2013-12-19 |
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