DE102012205067A1 - Arrangement for emitting light - Google Patents

Arrangement for emitting light

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Publication number
DE102012205067A1
DE102012205067A1 DE102012205067A DE102012205067A DE102012205067A1 DE 102012205067 A1 DE102012205067 A1 DE 102012205067A1 DE 102012205067 A DE102012205067 A DE 102012205067A DE 102012205067 A DE102012205067 A DE 102012205067A DE 102012205067 A1 DE102012205067 A1 DE 102012205067A1
Authority
DE
Germany
Prior art keywords
arrangement
diffuser
light source
led light
emitting light
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Withdrawn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
DE102012205067A
Other languages
German (de)
Inventor
Patrik Gassner
Bogna Ludwiczak
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.)
Zumtobel Lighting GmbH, Austria
Original Assignee
Zumtobel Lighting GmbH, Austria
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 Zumtobel Lighting GmbH, Austria filed Critical Zumtobel Lighting GmbH, Austria
Priority to DE102012205067A priority Critical patent/DE102012205067A1/en
Publication of DE102012205067A1 publication Critical patent/DE102012205067A1/en
Application status is Withdrawn legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02Combinations of only two kinds of elements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/12Combinations of only three kinds of elements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00Elongate light sources, e.g. fluorescent tubes
    • F21Y2103/10Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00Light-generating elements of semiconductor light sources
    • F21Y2115/10Light-emitting diodes [LED]

Abstract

Arrangement for emitting light (11), comprising at least one LED light source (2) and a light source in front of the LED light source (2) arranged diffuser (3), wherein the light output of the arrangement (11) via the diffuser (3) takes place and between the LED light source (2) and the diffuser (3) a lens arrangement (14) is provided, which is formed and arranged between the LED light source (2) and the diffuser (3), that the entire of the LED Light source (2) emitted light is substantially completely and evenly directed to the diffuser (3).

Description

  • The present invention relates to an arrangement for emitting light with at least one LED light source and a diffuser arranged in the light emission direction in front of the LED light source, wherein the light emission of the arrangement takes place via the diffuser.
  • In the case of elongated luminaires or arrangements for emitting light, which are used, for example, in the commercial sector, fluorescent lamps have hitherto frequently been used as light sources. The progressive development of LEDs now leads more and more to the fact that, for example, fluorescent lamps are replaced by corresponding LEDs. This results, on the one hand, from the fact that LED light sources have considerable advantages in terms of lifetime and energy efficiency compared to conventional light sources. On the other hand, the luminous intensity achievable with the help of LEDs is now sufficiently high that LED light sources can easily replace conventional light sources such as fluorescent lamps.
  • The use of LED light sources takes place, for example, already in the so-called slotlight of the Applicant, which is an elongated light through which a diffuse light emission takes place in order to create a uniform as possible brightened light band. In 1 is an example of a possible embodiment of such a slotlight light 1 shown in cross section, the light 1 an elongated housing 6 having a light exit opening. At the light exit opening is a diffuser 3 arranged, which closes the light exit opening. Accordingly, the light output of the lamp takes place 1 over the diffuser 3 ,
  • In the case 6 the light 1 is also an LED light source 2 provided in the housing 6 is placed that the diffuser 3 essentially in the light emission direction in front of the LED light source 2 located. To ensure that the largest possible part of the LED light source 2 Light emitted fairly evenly on the diffuser 3 is also a reflector 5 provided, the two laterally on the inside of the housing 6 arranged reflector wings 7 having, wherein the two reflector wings 7 essentially between the LED light source 2 and the diffuser 3 are located. Through these reflector wings 7 This achieves that much of the LED light source 2 emitted light on the diffuser 3 is directed, as well as that of the LED light source 2 emitted light, which is not directly in the direction of the diffuser 3 is blasted by multiple reflections on the reflector wings 7 in the direction of the diffuser 3 can be steered.
  • To achieve the highest possible efficiency and high efficiency of the luminaire 1 However, it is necessary to reach the reflector wings 7 have the highest possible reflector material to have the best possible reflection properties.
  • Furthermore, it is useful in the use of LED light sources and also necessary to prevent accidental contact with the electrical components, in particular the LED board.
  • This is in the in 1 shown light 1 in the case 6 additionally a transparent plate 4 provided between the LED light source 2 and the diffuser 3 is arranged. This ensures that even after removing the diffuser 3 a corresponding contact protection for the LED light source 2 given is. At the in 1 shown light 1 It is provided that the transparent plate 4 through the reflector 5 is held. The reflector 5 is here essentially U-shaped, wherein centrally within the U-shape, the LED light source 2 is arranged and the opening of the U-shape in the direction of the diffuser 3 shows. The reflector wings 7 , which form the wings of the U-shape, in this case are slightly curved and connected to each other via a central region of the U-shape, wherein in the reflector wings 7 in the vicinity of the central region corresponding recesses or recesses are provided, in each of which the ends of the transparent plate 4 are arranged, whereby the transparent plate 4 through the reflector 5 is held.
  • As already explained, at the in 1 shown light 1 a not inconsiderable part of the LED light source 2 emitted light by multiple reflection at the reflector wings 7 in the direction of the diffuser 3 Therefore, despite the selection of a correspondingly high-quality reflector material only a certain efficiency or a certain efficiency can be achieved.
  • The present invention is accordingly based on the object of further developing the arrangement outlined above for emitting light such that the efficiency or the efficiency is increased and at the same time ensuring that inadvertently touching the LED light source or the corresponding components can be prevented.
  • The object is achieved by an arrangement for emitting light according to claim 1. Advantageous developments of the invention are the subject of the dependent claims.
  • According to the invention, an arrangement for emitting light is proposed which has at least one LED light source and a diffuser arranged in the light emission direction in front of the LED light source, wherein the light emission of the arrangement takes place via the diffuser. In addition, between the LED light source and the diffuser, there is provided a lens assembly formed between the LED light source and the diffuser such that all the light emitted by the LED light source is substantially completely and uniformly directed to the diffuser.
  • The lens assembly thus allows nearly all of the light emitted by the LED light source to strike the diffuser and illuminate it fully and evenly without having to reflect a significant portion of the light emitted by the LED light source on a reflector It is achieved that the light emitted by the LED light source can be emitted efficiently and with high efficiency in almost complete and uniform manner via the diffuser.
  • In addition, however, it can also be provided that reflector wings arranged laterally between the lens arrangement and the diffuser are also provided which also possibly direct stray light to the diffuser. In this case, the reflector wings can also be arranged laterally next to the lens arrangement, the lens arrangement being fastened by the reflector wings in the arrangement for emitting light. In addition, the reflector wings may be part of a substantially U-shaped reflector, wherein the LED light source is arranged centrally within the U-shape and shows the opening of the U-shape in the direction of the diffuser.
  • In order to ensure that the light emitted by the LED light source is directed as completely and uniformly as possible through the lens arrangement on the diffuser, it is advantageously provided that the lens arrangement is formed in cross-section substantially frusto-conical, wherein it is the LED light source facing end portion to the top surface of the truncated cone and at the end facing the diffuser to the base of the truncated cone.
  • The end portion of the truncated cone facing the LED light source may in this case have a recess with a bottom surface and two side surfaces, wherein the LED light source is arranged substantially in the recess, such that the bottom surface and the side surfaces of the light entry surface of the lens assembly for that of LED light emitted, the bottom surface convex and the side surfaces may be concave. In addition, the end region of the truncated cone facing the diffuser can be substantially planar and form the light exit surface of the lens arrangement and can be configured such that the light leaving the lens arrangement is slightly widened. In addition, the two lateral lateral surfaces of the truncated cone can be curved and designed to be totally reflective.
  • This special lens arrangement permits efficient collection, bundling and uniform distribution of the light emitted by the LED light source to an underlying or subsequent diffuser.
  • Preferably, it can also be provided that the end region of the truncated cone facing the diffuser has laterally arranged, in particular multiply wound-out, arms for fastening the lens arrangement in the arrangement for emitting light.
  • This then gives rise to the possibility that the lens arrangement can be fastened in the same recesses or recesses of a reflector, in which the transparent plate known from the slotlight luminaire is already held or fastened.
  • Advantageously, it is further provided that the arrangement for emitting light is elongated and has a plurality of longitudinally arranged LED light sources. It can then be provided that a common lens arrangement is provided for all LED light sources, which has the same cross section over the entire length. In this embodiment, the lens arrangement influences the uniform illumination of the diffuser, in particular over the width of the light exit opening, since over the entire length the lens arrangement has the same cross section. Accordingly, the light emitted by the LED light source is essentially only transversely affected and thus in one plane.
  • Alternatively, however, it could also be provided that a plurality of lens arrangements are present, wherein each lens arrangement is associated with at least one LED light source. In this way, for example, there is the possibility that each LED light source is assigned a single lens arrangement, which in addition to the transverse direction also an influence in the longitudinal direction and thus in two planes is possible. The light may then be influenced such that it is directed substantially completely towards the diffuser in the transverse direction and, on the contrary, tends to be distributed widely in the longitudinal direction. Due to this rather broad distribution will be a better mixing of the light in Longitudinal, whereby the influence of individual LED failures or different color or luminous flux densities (deviations and consequent irregularities) can be minimized.
  • Preferably, furthermore, it can also be provided that the arrangement for emitting light has a housing with a light exit opening, in which housing the at least one LED light source and the lens arrangement are arranged and the diffuser closes the light exit opening.
  • The invention will be explained in more detail with reference to embodiments and the accompanying drawings. Show it:
  • 1 known arrangement for emitting light in cross-section from the prior art;
  • 2 inventive arrangement for light emission in cross section;
  • 3 arrangement according to the invention for emitting light in cross section with beam paths of the light;
  • 4 arrangement according to the invention for emitting light in cross section with beam paths of the light;
  • 1 shows, as already explained above, by way of example, a slotlight lamp already known from the prior art 1 the applicant. In this arrangement for light emission or light 1 is between the LED light source 2 and the diffuser 3 a transparent plate 4 provided, which serves in particular as protection against contact. The light steering of the LED light source 2 emitted light, however, takes place essentially by the reflector wings 7 of the reflector 5 , The reflector wings 7 have corresponding recesses or recesses in which the ends of the transparent plate 4 are arranged and accordingly by the reflector 5 being held. In this known from the prior art lamp 1 will be a significant part of the LED light source 2 emitted light on multiple reflections on the reflector wings 7 on the diffuser 3 directed, causing the reflector wings 7 must have a correspondingly high-quality reflector material.
  • In the present invention, on the other hand, it is provided that instead of the transparent plate 4 a lens arrangement 14 is used. 2 shows a corresponding inventive lamp 11 or arrangement for emitting light, which in turn is a diffuser 3 and an LED light source 2 having. As already at the in 1 shown light 1 is also at the in 2 shown light 11 the LED light source 2 within a housing 6 arranged, with the diffuser 3 the light exit opening of the housing 6 closes. Likewise, the lamp points 11 a reflector 5 with two laterally inside the case 6 arranged reflector wings 7 on, with the lens arrangement 14 is fastened or held in the same recesses or recesses, in which also the ends of the transparent plate 4 in 1 be held or attached. For this purpose, the lens arrangement 14 two multi-angled arms, each side of the main body of the lens assembly 14 are arranged.
  • The main body of the lens assembly 14 is in this case frustoconical, which is where the LED light source 2 facing end area to the top surface of the truncated cone and the diffuser 3 facing end portion to the base of the truncated cone and the multi-angled arms at the diffuser 3 facing end portion of the truncated cone are arranged laterally.
  • The LED light source 2 facing end portion of the truncated cone additionally has a recess, wherein the LED light source 2 is arranged substantially in the recess. The recess consists essentially of a bottom surface and two side surfaces corresponding to the light entry surface of the lens assembly 14 for that of the LED light source 2 form emitted light.
  • The bottom surface is in this case formed as a convex, spherical lens having a radius of, for example, 13 mm, wherein the geometry is selected such that that of the LED light source 2 emitted light, for example, in an angular range of -50 ° to + 50 ° hits the ground surface and is bundled by the convex shape. This light then leaves the lens assembly 14 over the diffuser 3 facing end portion of the truncated cone, said end portion is substantially planar and the light exit surface of the lens assembly 14 forms. In addition, this end portion is also formed such that the lens assembly 14 leaving light is slightly widened or broken, for example in an angular range of -35 ° to 35 °, such that this proportion of light on the entire width of the diffuser 3 is evenly distributed.
  • In 3 is the in 2 shown lamp according to the invention 11 represented with corresponding light rays, where there in particular that of the LED light source 2 emitted light is shown, which hits the bottom surface of the recess. As a result of the convex shape of the bottom surface, the light is initially concentrated, and then again when leaving the lens arrangement 14 over the diffuser 3 facing end region due to refraction to be slightly widened, such that the lens assembly 14 leaving light the diffuser 3 illuminated as completely and evenly as possible.
  • The side surfaces of the recess, in contrast, are formed as a concave, spherical lens with a radius of, for example, about 4.5 mm, wherein it is provided that these side surfaces of the LED light source 2 light emitted in an angular range, for example, from -90 ° to -50 and from + 50 ° to + 90 ° record. The LED light source 2 In this case, it may be arranged in the recess such that it is located in the center of the circle of the two side surfaces, so that no change in direction of the light is produced. The side surfaces then pass the light radially (ie without diffraction) to the lateral lateral surfaces of the truncated cone. These lateral lateral surfaces are in this case curved and formed totally reflecting, so that the light directed from the side surfaces to the lateral surfaces of the light is deflected by total reflection, such that after leaving the lens assembly 14 over the diffuser 3 facing the light also illuminates the diffuser completely and evenly. It should be noted that this light is again slightly widened by refraction through the end region facing the diffuser.
  • In 4 Now corresponding light rays are shown by the LED light source 2 in the lens arrangement 14 get over the side surfaces of the depression. 4 again shows the in 2 shown lamp according to the invention 11 ,
  • Both over the bottom surface of the recess in the lens assembly 14 entering light as well as the over the side surfaces of the recess in the lens assembly 14 incoming light is through the lens assembly 14 influenced so that it after leaving the lens assembly 14 the diffuser 3 evenly and completely illuminated, resulting in higher efficiency and better efficiency.
  • In addition, it should also be noted that the design of the lens arrangement 14 and in particular by the attachment in the same recesses or recesses, the lens assembly 14 , as well as the transparent plate 4 , as contact protection for the LED light source 2 and the corresponding components and accordingly unintentional contact with these parts when opening the diffuser 3 can be largely prevented.
  • Accordingly, it would also be conceivable that existing Slotlight lights 1 the transparent plates 4 by appropriate lens arrangements 14 be replaced and thus a new light 11 is created according to the inventive arrangement for light output.
  • Furthermore, it should be noted that the known slotlight luminaires are elongate luminaires which have a plurality of LED light sources distributed over the length. In this case, it can then be provided that a common lens arrangement is provided for all LED light sources, which has an unchanged cross-section in the longitudinal direction. In this case, the light is then essentially influenced only in the transverse direction and thus only in one plane. Alternatively, however, a plurality of lens arrangements could also be provided, for example a lens arrangement for each LED light source. As a result, there is the possibility that the light can be influenced both in the transverse direction and in the longitudinal direction and thus in several planes. In the longitudinal direction, for example, a very wide distribution or generation of very flat light may be desired in order to achieve even better light mixing.
  • To the reflector or the reflector wings is still to be noted that they can still be present in order to direct any existing stray light on the diffuser. In this case, however, it is then no longer necessary to use a particularly high-quality and thus expensive reflector material, since the proportion of the light which is directed by the reflector wings onto the diffuser is considerably lower than in the case of FIG 1 shown light.

Claims (14)

  1. Arrangement for emitting light ( 11 ), with at least one LED light source ( 2 ) and in the light emission direction in front of the LED light source ( 2 ) arranged diffuser ( 3 ), wherein the light output of the arrangement ( 11 ) over the diffuser ( 3 ), characterized in that between the LED light source ( 2 ) and the diffuser ( 3 ) a lens arrangement ( 14 ) provided in such a way and between the LED light source ( 2 ) and the diffuser ( 3 ) is arranged that the whole of the LED light source ( 2 ) emitted light substantially completely and evenly on the diffuser ( 3 ).
  2. Arrangement for emitting light according to claim 1, characterized in that laterally between the lens arrangement ( 14 ) and the diffuser ( 3 ) arranged reflector wings ( 7 ) are provided.
  3. Arrangement for emitting light according to claim 2, characterized in that the reflector wings ( 7 ) also laterally next to the lens arrangement ( 14 ) are arranged and the lens arrangement ( 14 ) through the reflector wings ( 7 ) in the arrangement for emitting light ( 11 ) is attached.
  4. Arrangement for emitting light according to one of claims 2-3, characterized in that the reflector wings ( 7 ) Part of a substantially U-shaped reflector ( 5 ), the LED light source ( 2 ) is arranged centrally within the U-shape and the opening of the U-shape in the direction of the diffuser ( 3 ) shows.
  5. Arrangement for emitting light according to one of the preceding claims, characterized in that the lens arrangement ( 14 ) is formed in cross section substantially frusto-conical, wherein it is in the LED light source ( 2 ) end region around the top surface of the truncated cone and in which the diffuser ( 3 ) facing end area around the base of the truncated cone is.
  6. Arrangement for emitting light according to claim 5, characterized in that that of the LED light source ( 2 ) facing end portion of the truncated cone has a recess with a bottom surface and two side surfaces, wherein the LED light source ( 2 ) is arranged substantially in the recess, such that the bottom surface and the side surfaces of the light entry surface of the lens assembly ( 14 ) for the LED light source ( 2 ) form emitted light.
  7. Arrangement for emitting light according to claim 6, characterized in that the bottom surface is convex and the side surfaces are concave.
  8. Arrangement for emitting light according to one of claims 5-7, characterized in that the diffuser ( 3 ) facing end portion of the truncated cone is substantially planar and the light exit surface of the lens assembly ( 14 ) is formed and thereby formed such that the lens arrangement ( 14 ) leaving light is slightly widened.
  9. Arrangement for emitting light according to one of claims 5-8, characterized in that the two lateral lateral surfaces of the truncated cone are formed curved and totally reflecting.
  10. Arrangement for emitting light according to one of claims 5-9, characterized in that the diffuser ( 3 ) facing end portion of the truncated cone laterally arranged, in particular multiply angled, arms for fixing the lens assembly ( 14 ) in the arrangement for emitting light ( 11 ) having.
  11. Arrangement for emitting light according to one of the preceding claims, characterized in that the arrangement for emitting light ( 11 ) is elongated and a plurality of longitudinally arranged LED light sources ( 2 ) having.
  12. Arrangement for emitting light according to claim 11, characterized in that for all LED light sources ( 2 ) a common lens arrangement ( 14 ) is provided, which has the same cross section over the entire length.
  13. Arrangement for emitting light according to claim 11, characterized in that a plurality of lens arrangements ( 14 ) are provided, each lens assembly ( 14 ) at least one LED light source ( 2 ) assigned.
  14. Arrangement for emitting light according to one of the preceding claims, characterized in that the arrangement for emitting light ( 11 ) a housing ( 6 ) having a light exit opening, wherein in the housing ( 6 ) the at least one LED light source ( 2 ) and the lens arrangement ( 14 ) are arranged and the diffuser ( 3 ) closes the light exit opening.
DE102012205067A 2012-03-29 2012-03-29 Arrangement for emitting light Withdrawn DE102012205067A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102012205067A DE102012205067A1 (en) 2012-03-29 2012-03-29 Arrangement for emitting light

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012205067A DE102012205067A1 (en) 2012-03-29 2012-03-29 Arrangement for emitting light
EP13161035.4A EP2644982B1 (en) 2012-03-29 2013-03-26 Light emitting assembly

Publications (1)

Publication Number Publication Date
DE102012205067A1 true DE102012205067A1 (en) 2013-10-02

Family

ID=48045278

Family Applications (1)

Application Number Title Priority Date Filing Date
DE102012205067A Withdrawn DE102012205067A1 (en) 2012-03-29 2012-03-29 Arrangement for emitting light

Country Status (2)

Country Link
EP (1) EP2644982B1 (en)
DE (1) DE102012205067A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013226181A1 (en) 2013-12-17 2015-06-18 Zumtobel Lighting Gmbh Optical element and arrangement for emitting light

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DE202009013230U1 (en) * 2009-09-16 2011-02-03 Ledon Lighting Jennersdorf Gmbh LED luminaire element for illuminating a light box with homogeneous light distribution
US7918583B2 (en) * 2006-08-16 2011-04-05 Rpc Photonics, Inc. Illumination devices
DE202010008480U1 (en) * 2010-09-08 2011-12-09 Zumtobel Lighting Gmbh LED light for the production of white light

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US7425077B2 (en) * 2005-05-02 2008-09-16 Pelton & Crane LED-powered dental operatory light
DE102007002403B4 (en) * 2007-01-17 2016-03-03 Osram Gmbh Lighting arrangement, multiple light module, luminaire and their use
DE102010014289B4 (en) * 2010-04-08 2014-03-27 Trilux Gmbh & Co. Kg Light module and luminaire with light module

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7918583B2 (en) * 2006-08-16 2011-04-05 Rpc Photonics, Inc. Illumination devices
DE202009013230U1 (en) * 2009-09-16 2011-02-03 Ledon Lighting Jennersdorf Gmbh LED luminaire element for illuminating a light box with homogeneous light distribution
DE202010008480U1 (en) * 2010-09-08 2011-12-09 Zumtobel Lighting Gmbh LED light for the production of white light

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013226181A1 (en) 2013-12-17 2015-06-18 Zumtobel Lighting Gmbh Optical element and arrangement for emitting light
US10024521B2 (en) 2013-12-17 2018-07-17 Zumtobel Lighting Gmbh Optical element, and assembly for emitting light

Also Published As

Publication number Publication date
EP2644982B1 (en) 2015-09-09
EP2644982A1 (en) 2013-10-02

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