EP2876363B1 - Lampe à DEL - Google Patents

Lampe à DEL Download PDF

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Publication number
EP2876363B1
EP2876363B1 EP14003734.2A EP14003734A EP2876363B1 EP 2876363 B1 EP2876363 B1 EP 2876363B1 EP 14003734 A EP14003734 A EP 14003734A EP 2876363 B1 EP2876363 B1 EP 2876363B1
Authority
EP
European Patent Office
Prior art keywords
light
led
leds
reflector surface
output disc
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.)
Active
Application number
EP14003734.2A
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German (de)
English (en)
Other versions
EP2876363A1 (fr
Inventor
Stanislav Horvat
Günther SEJKORA
Joachim Geiginger
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.)
Neulicht lighting solutions GmbH
Original Assignee
Neulicht lighting solutions GmbH
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Publication date
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Publication of EP2876363A1 publication Critical patent/EP2876363A1/fr
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Publication of EP2876363B1 publication Critical patent/EP2876363B1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/0008—Reflectors for light sources providing for indirect lighting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/62—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using mixing chambers, e.g. housings with reflective walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S4/00—Lighting devices or systems using a string or strip of light sources
    • F21S4/20—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports
    • F21S4/28—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports rigid, e.g. LED bars
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00—Producing 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
    • F21V13/02—Combinations of only two kinds of elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00—Producing 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
    • F21V13/02—Combinations of only two kinds of elements
    • F21V13/10—Combinations of only two kinds of elements the elements being reflectors and screens
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V3/00—Globes; Bowls; Cover glasses
    • F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
    • F21V3/06—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/0025—Combination of two or more reflectors for a single light source
    • F21V7/0033—Combination of two or more reflectors for a single light source with successive reflections from one reflector to the next or following
    • F21V7/0041—Combination of two or more reflectors for a single light source with successive reflections from one reflector to the next or following for avoiding direct view of the light source or to prevent dazzling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/005—Reflectors for light sources with an elongated shape to cooperate with linear light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING 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
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
    • F21Y2103/10—Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING 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
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to an LED lamp comprising a plurality of LEDs as a light source, acting as a diffuser light exit plate, at least one cover for the LEDs, wherein the light emitted from the LEDs and incident on the light exit lens luminous flux to more than 90% indirectly from the LEDs reaches the light exit plate, and a main reflector surface on which at least a portion of the light emitted by the LEDs luminous flux passes directly and is reflected by which incident light at least partially directly to the light exit plate, wherein the main reflector surface is formed such that its reflected light, which has a lying in the visible range Wellenläge, at least predominantly diffuse reflected.
  • LEDs used in LED lights are relatively small light sources, which leave the viewer the impression of a spotlight. Nevertheless, in order to achieve a pleasant and even brightness impression of the LED lights, diffusers are used in practice. These allow a relatively homogeneous luminance over the entire extent of the light exit plate.
  • An example of such a LED light is in the WO 2012/069312 shown, wherein the LEDs are mounted on a side wall normal to the light exit plate. The light exit plate is offset with a scattering medium, which leads to a diffuse transmission of light through the light exit plate.
  • the DE 10 2007 030 186 A1 shows an LED lamp, in which the LEDs are not directly visible from the outside are arranged in close proximity to the light exit plate, the luminous flux of the LEDs is first reflected on the highly reflective main reflector surface and then leaves the LED light through a light diffuser designed as a diffuser.
  • LED luminaires Despite the use of a diffuser, conventional LED luminaires have an uneven light impression on the light exit window of the LED luminaire due to the high luminous flux emanating from the LEDs.
  • An LED lamp of the type mentioned with a circular cylindrical light exit plate is in the WO 2013/098723 A1 shown.
  • the LEDs are arranged in one embodiment according to this document in two symmetrical opposite rows. A predominant portion of the light emitted by the LEDs directly impinges on reflector surfaces of a reflector arranged at an angle to one another and is reflected from there to the light exit disk acting as a diffuser.
  • the object of the invention is to provide an advantageous LED lamp of the aforementioned type with an improved uniformity of the luminance over the extent of the light exit disc, in particular even in a newly formed light exit disc.
  • the main reflector surface is designed in such a way that it reflects at least predominantly diffusely reflected light which has a wavelength lying in the visible range, and this applies to any angle of incidence of the light.
  • the main reflector surface extends from a first edge region of the light exit plate and intersects a normal to the light exit plate and passing through the LED straight at a point that has a greater distance from the light exit plate than the LED
  • the LED lamp further comprises at least one auxiliary reflector surface to which at least a part of the light emitted from the light exit plate toward the at least one cover part directly passes light and is reflected by which incident light at least partially directly on the light exit plate.
  • the auxiliary reflector surface is based on a, opposite the first edge region of the light exit plate second edge region of the light exit plate and includes at least over a major part of its extension an angle with the light exit disc, which is in the range of 45 ° +/- 15 °.
  • the visible wavelength range is set from 380nm to 780nm.
  • the main reflector surface is formed such that upon an incidence of standard illuminant D65, the light reflected from it is diffusely reflected (at any angle of incidence) by at least 80%, preferably at least 90%, more preferably at least 95%. In particular, this is the case for light of any wavelength in the visible range (ie from 380 nm to 780 nm).
  • the total reflectance of the main reflector surface which includes the diffuse and directed reflection, is preferably more than 90%, more preferably more than 95%, again based on standard illuminant D65.
  • the light from the LEDs passes directly, i. without intermediate reflection, on the main reflector surface. This is preferably the case for more than 50%, particularly preferably for more than 70% of the total luminous flux emitted by the LEDs.
  • the light incident on the main reflector surface is at least partially directly, i. without intermediate reflection, reflected on the light exit plate. This is preferably the case for at least 30% of the total luminous flux reflected by the main reflector surface. On the other hand, preferably at least 15% of the total luminous flux reflected by the main reflector surface only reaches the light exit disk after at least one further reflection on one part of the luminaire, mainly on another section of the main reflector surface.
  • the light exit lens with respect to a rectangular incidence of light of the standard illuminant D65 has a reflectance of at least 10%. At oblique incidence of the reflected portion is of course correspondingly larger. A not inconsiderable part of the incident light on the lens is then reflected back into the interior of the lamp, which reinforce the multiple reflections.
  • the LED lamp has, in addition to the main reflector surface on an auxiliary reflector surface, advantageously at least 30% of the total reflected from the auxiliary reflector surface luminous flux is reflected directly onto the light exit plate. At least 15% of the total luminous flux reflected by the auxiliary reflector surface preferably reaches the light exit window only after at least one further reflection on a part of the luminaire.
  • auxiliary reflector surface is formed such that the light reflected by it, which has a wavelength lying in the visible range, for the most part diffusely reflected.
  • the auxiliary reflector surface is formed such that at an incidence of light of the standard illuminant D65, the light reflected by it for any angle of incidence to at least 80%, preferably at least 90%, more preferably at least 95%, diffusely reflected , In particular, this is the case for light of any wavelength in the visible range.
  • Light emitted by the LED luminaire emerges from the light exit window, preferably more than 80% of the light emitted by the LED luminaire, particularly preferably the entire light emitted by the LED luminaire.
  • the light emission disc acts as a diffuser means that, given an incidence of light, in particular standard illuminant D65, the transmitted light is at least predominantly diffusely transmitted for any angle of incidence of the light. In particular, this is the case for light of any wavelength in the visible range.
  • a light exit lens is used, from which the transmitted light is transmitted to at least 80% diffusely at an incidence of light of the standard illuminant D65 (regardless of the incidence angle).
  • occurring differences in illuminance can be achieved, in which the ratio between the minimum and mean value in a range of less than 1: 6, for example in the range of about 1: 4.
  • the main beam direction of the light emitted by the LED is at least a major part, i. more than 50% of the LEDs, preferably all LEDs, at an angle of +/- 45 °, preferably +/- 30 °, more preferably parallel to the plane of the light exit plate.
  • the main beam direction of an LED means the center axis of the distribution of the luminous flux emanating from the LED.
  • Embodiment of the invention shows an elongated in the direction of a longitudinal axis LED lamp 1.
  • the LED lamp 1 has a housing 7, a main reflector surface 5, an auxiliary reflector surface 6 and a light-emitting disk 3 attached to the housing 7.
  • the main reflector surface 5 and the auxiliary reflector surface 6 are formed by translation of a generator in the direction of the longitudinal axis of the LED lamp 1.
  • the LEDs 2 are arranged along a straight line spaced from each other, see. Fig. 3 and 4 , The straight line is aligned parallel to the longitudinal axis of the LED lamp 1 in the embodiment.
  • the LEDs 2 may be e.g. each 30mm to 80mm apart. Preferably, the distance between individual LEDs 2 is at least 30mm, more preferably more than 50mm.
  • the LED lamp 1 has a cover 4, which covers the LEDs 2 at least for the most part.
  • the cover 4 hereby shields the luminous flux emitted by the LEDs 2 at least insofar as the light beams directly impinge on the light exit disk 3, that the luminous flux emitted by the LEDs 2 and impinging on the light exit disk 3 amounts to more than 90%, preferably more than 95% %, indirectly from the LEDs 2 on the light exit plate 3 passes.
  • perception of the LEDs 2 as point light sources is counteracted by the light exit disk 3.
  • the embodiment arrives in an in Fig. 5 It is preferably provided that more than 90% of the surface, in particular more than 95% of the surface of the light exit plate 3, is only indirectly illuminated by the LEDs 2.
  • the LEDs 2 are then so over more than 90%, in particular more than 95%, the extent of the light exit plate 3 seen from the light exit window 3 from not visible.
  • the LEDs 2 could be completely covered by the cover 4 in other embodiments, so that they are directly from any point of the light emission disc 3 can be viewed.
  • the cover 4 is offset from the plane 13 of the light exit plate 3 and spaced from this in a cavity of the LED lamp 1.
  • level 13 of the light exit plate 3 is parallel to the large surfaces of the light exit plate 3 center plane of the light exit plate 3 is referred to in the present specification , see. Fig. 5 ,
  • the light incident on the main reflector surface 5 is at least partially directly, i. without intervening reflection, reflected on the light exit plate 3. In the exemplary embodiment, this is the case for at least 30% of the total luminous flux reflected by the main reflector surface 5.
  • preferably at least 15% of the total luminous flux reflected by the main reflector surface 5 reaches the light exit plate 3 only after at least one further reflection on a part of the LED luminaire 1, mainly on another section of the main reflector surface 5.
  • the main reflector surface 5 is formed such that at an incidence of light of the standard illuminant D65, the light reflected from it for any angle of incidence is at least 95% diffusely reflected.
  • the main reflector surface 5 is formed, for example, by a highly reflective film laminated onto a main reflector part 16. There are also other embodiments of the main reflector surface 5, such as coatings with the corresponding reflection properties, conceivable and possible.
  • the main reflector part 16 may be a bent metal sheet or a correspondingly shaped plastic part or the like. It may also be the entire main reflector part 16 formed of a mechanically stable, highly reflective film, which is brought, for example, by thermal deformation or by mechanical bias in the desired shape.
  • the cover part 4 is made in one piece with an auxiliary reflector part 17, which has the auxiliary reflector surface 6. It is also possible that the cover part 4 and the auxiliary reflector part 17 are two separate or mutually independent parts.
  • an elongated, flat cover member 4 is provided.
  • cover part 4, and / or the auxiliary reflector part 17 also formed in the exemplary embodiment, could also be curved.
  • the auxiliary reflector surface 6 is formed in the exemplary embodiment such that light reflected from it for any angle of incidence of the standard illuminant D65 is reflected more than 95% diffusely.
  • a high-reflection film laminated on the auxiliary reflector part 17 or a suitable coating having similar reflection properties as those of the main reflector surface 5 may be used. It can also be the whole auxiliary reflector part 17 formed from a mechanically stable, highly reflective film be brought into the desired shape, for example by thermal deformation or by mechanical bias.
  • the surface of the cover part 4 facing the LEDs 2 can also be provided with a film or a coating which has the reflection properties described in the embodiments for the auxiliary reflector surface 6.
  • the LED 2 facing surface of the cover 4 but could also be performed less reflective or reflective reflective.
  • At least a part of the light reflected by the light exit plate 3 in the direction of the cover part 4 passes directly onto the auxiliary reflector surface 6.
  • the incident on the auxiliary reflector surface 6 light is subsequently reflected at least in part directly on the light exit plate 3.
  • the acting as a diffuser light exit plate 3 is favorably designed so that when an incidence of light of the standard illuminant D65, the transmitted light is transmitted diffusely relative to any angle of incidence of the light to a predominant part. In the exemplary embodiment, at least 80% of the transmitted light is transmitted diffusely.
  • the light exit disc 3 has a reflectance of at least 10% relative to a rectangular incidence of standard illuminant D65. In the exemplary embodiment, this value is about 15%. This reflectance ensures by the resulting multiple reflections in the interior of the LED lamp 1 for a further homogenization of the luminance of the LED lamp 1. It is thus achieved in particular that of the Auxiliary reflector surface 6 opposite area of the light exit plate 3 is brightened by incident thereon light rays.
  • the optical properties of the light exit plate 3 are preferably such that the sum of the reflectance and transmittance at a rectangular incidence of light of standard illuminant D65 is greater than 70%, in the exemplary embodiment, this sum is about 83%.
  • a suitable material for the light exit plate 3 is PMMA. Other suitable materials known in the art can also be used.
  • the reflection could also be predominantly diffuse.
  • suitable scattering means may be provided in the light exit plate 3. It is also conceivable and possible to apply a coating. Also, a structured light exit plate 3, with microprisms, etc., is possible.
  • Fig. 5 showing a cross section through the LED lamp 1 extending through one of the LEDs 2, the contour of the main reflector surface 5 and the auxiliary reflector surface 6 can be seen in particular.
  • the main reflector surface 5 starts from a first edge region of the light exit plate 3 and intersects a straight line 15 passing through the LED 2 and passing through the LED 2 at a point 16 which is a greater distance from the light exit plate 3 than the LED 2 having. This is preferably the case for all cross sections through the LED lamp 1, which run through the LEDs 2.
  • a range of less than 10% of the width of the light exit plate 3 is referred to.
  • the angle 19 below which the main reflector surface 5 starts from the edge region of the light exit disk 3 is preferably between 60 ° and 110 °, in the exemplary embodiment this angle 19 is approximately 70 °, cf. Fig. 5 , At point 16, the angle under which the main reflector surface 5 intersects the straight line 15 is approximately 90 °. In other words, the main reflector surface 5 is aligned parallel with respect to the light exit plate 3 at the point 16. Other angles below which the main reflector surface 5 intersects the straight line 15 at point 16, in particular in the range from 0 ° to 45 °, are conceivable and possible.
  • the main reflector surface 5 in this case has a concave shape toward the side of the LEDs 2. It is also conceivable and possible in this context for the main reflector surface 5 to be designed as a polygonal pull, it being pointed out that edges formed parallel to the longitudinal axis of the LED lamp 1 have an unfavorable effect and should preferably be rounded.
  • the angles of incidence of the LEDs 2 on the main reflector surface are 5 directly incident light rays in section a larger than in section b.
  • the angle 9 between a the main reflector surface 5 applied tangent 10 and a direct incident on this point 11 of the LED 2 light beam is greater than the angle 12, at any point 14 in a lying closer to the LED 2 section b the Main reflector surface 5 includes a tangent 10 applied to the main reflector surface 5 with a light beam incident directly to this point 14 from the LED 2.
  • the angle 9 between the tangent 10 and the incident light beam when in Fig. 5 Point a drawn in section a about 46 °, while the analogous angle 12 at point 14 shown in section b is about 23 °.
  • the angle between the tangents 10 and the directly incident light beams is again larger in the exemplary embodiment than in the region b. In other embodiments, this could be different.
  • the main reflector surface 5, starting from point 16, could first be removed from the light exit disk 3 with increasing distance from the LEDs 2.
  • the auxiliary reflector surface 6 is based on a second edge region of the light exit disk 3 opposite the first edge region of the light exit disk 3, wherein it is flat in the exemplary embodiment and forms an angle 18 with the light exit disk 3, which is approximately 45 °. Amounts other than this value for the angle 18, e.g. in the range of 45 ° +/- 15 °, are conceivable and possible.
  • the auxiliary reflector surface 6 could also have a curved or polygonal profile as viewed in cross section through the LED lamp 1. In this case, it would be preferable for it to include at least over a large part of its extent an angle 17 with the light exit disk 3, which lies in the region of 45 ° +/- 15 °.
  • the total reflectance including the diffuse and directed components, may be about 98%.
  • the main beam direction 8, ie the center axis of the distribution of the light intensity of the light emitted by the LEDs 2, is in the exemplary embodiment for all of the LEDs 2 is parallel to the plane 13 of the light emission disc 3. This is not necessarily so, for example, it is also conceivable and possible for the main beam direction 8 of the light 2 emitted by the LEDs 2 to be at an angle of +/- 45 ° with respect to the plane 13 the light exit plate 3 are aligned.
  • the LEDs 2 are attached to a side wall 20 of the housing 7.
  • an LED board which carries the LEDs 2 is fastened to the side wall 20 of the housing 7.
  • the side wall 20 is in the embodiment perpendicular to the plane 13 of the light exit plate 3, but in other embodiments, but for example, an angle with the plane 13 of the light exit plate 3 include, which is in the range of 45 ° to 90 °.
  • Fig. 5 two exemplary light beams emanating from the LED 2 are shown.
  • a refraction effect in the passage of the light beam through the light exit plate 3 has been omitted for simplicity.
  • corresponding refractions will occur here.
  • the differences in luminance at the light exit disk 3 can, at least when omitting the edge regions of the light exit disk 3, have an inhomogeneity of less than 1: 3, in the exemplary embodiment less than 1: 2, in terms of minimum and average values.
  • the embodiment shown shows an LED lamp 1 with a single row of LEDs 2. It is also conceivable and possible to provide a plurality of rows of LEDs 2.
  • the LED lamp 1 could further, for example, also have a design which, in addition to the in Fig. 5 illustrated arrangement comprises a mirrored on the side wall 20 arrangement.
  • LEDs 2 In addition to the use of white LEDs 2, it is also possible to use colored LEDs 2 to achieve color effects and to influence the luminous characteristics of the LED lamp 1. It can e.g. alternately different colored LEDs 2 are used, which can be changed in their relative brightnesses, whereby changeable colors of the light emitted by the LED light 1 are made possible. Colored LEDs 2 can also be used in addition to white LEDs 2, it being possible, if necessary, to change the relative brightness of the LEDs again.
  • white LEDs 2 with different color temperatures, e.g. alternately warm white and cold white LEDs 2, which allow a variable color temperature, is conceivable and possible.
  • the LED light 1 is designed such that the entire light emitted by the LED light 1 emerges from the light exit window 3. It is also conceivable and possible for part of the light emitted by the LEDs 2 to leave the LED light 1 at another point.
  • the LEDs 2 are preferably arranged spaced apart along a circular line.
  • the main reflector surface 5 and the auxiliary reflector surface 6 may accordingly be rotationally symmetrical.
  • a partial section through the LED lamp 1, which runs through the lying on one side of the axis of rotation of the LED lamp 1, Fig. 5 correspond, wherein the perpendicular to the plane 13 of the light exit disc 3 standing axis of rotation outside of in Fig. 5 is shown cutting area.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Claims (9)

  1. Lampe à DEL (1) comportant : une pluralité de DEL (2) en tant que source de lumière ; une vitre de sortie de lumière (3) agissant en tant que diffuseur ; au moins une partie de recouvrement (4) pour les DEL (2), le flux lumineux délivré par les DEL (2) et incident sur la vitre de sortie de lumière (3) parvenant à plus de 90 % indirectement des DEL (2) sur la vitre de sortie de lumière (3) ; et une surface de réflexion principale (5) sur laquelle parvient directement au moins une partie du flux lumineux délivré par les DEL (2) et de laquelle de la lumière incidente est réfléchie au moins en partie directement sur la vitre de sortie de lumière (3), la surface de réflexion principale (5) étant conçue de manière que la lumière qu'elle réfléchit, qui comprend une longueur d'onde située dans le domaine visible, est réfléchie au moins essentiellement de manière diffuse, caractérisée en ce que, dans une section en coupe traversant l'une des DEL (2) vue à travers la lampe à DEL (1), la surface de réflexion principale (5) s'étend depuis une première zone marginale de la vitre de sortie de lumière (3) et coupe une droite (15), perpendiculaire à la vitre de sortie de lumière (3) et traversant la DEL (2), en un point (16) qui présente une plus grande distance à la vitre de sortie de lumière (3) que la DEL (2), et la lampe à DEL (1) comprend au moins une surface de réflexion auxiliaire (6) sur laquelle parvient au moins directement une partie de la lumière réfléchie par la vitre de sortie de lumière (3) en direction de l'au moins une partie de recouvrement (4) et de laquelle de la lumière incidente est réfléchie au moins en partie directement sur la vitre de sortie de lumière (3), la surface de réflexion auxiliaire (6) s'étendant d'une seconde zone marginale de la vitre de sortie de lumière (3) opposée à la première zone marginale de la vitre de sortie de lumière (3) et formant au moins sur une grande partie de son étendue un angle (17) avec la vitre de sortie de lumière (3) qui est situé dans la plage de 45° +/- 15°.
  2. Lampe à DEL (1) selon la revendication 1, caractérisée en ce que la vitre de sortie de lumière (3) présente, par rapport à une incidence perpendiculaire de lumière du type d'éclairage normalisé D65, un facteur de réflexion d'au moins 10 %.
  3. Lampe à DEL (1) selon la revendication 1 ou 2, caractérisée en ce que la surface de réflexion principale (5) est conçue de manière que, en cas d'incidence de lumière du type d'éclairage normalisé D65, la lumière qu'elle réfléchit est réfléchie au moins à 80 % de manière diffuse.
  4. Lampe à DEL (1) selon l'une quelconque des revendications 1 à 3, caractérisée en ce que la surface de réflexion auxiliaire (6) est conçue de manière que la lumière qu'elle réfléchit, qui présente une longueur d'onde située dans le domaine visible, est réfléchie en majeure partie de manière diffuse.
  5. Lampe à DEL (1) selon la revendication 4, caractérisée en ce que la surface de réflexion auxiliaire (6) est conçue de manière que, en cas d'une incidence de lumière du type d'éclairage normalisé D65, la lumière qu'elle réfléchit est réfléchie au moins à 80 % de manière diffuse.
  6. Lampe à DEL (1) selon l'une quelconque des revendications 1 à 5, caractérisée en ce que plus de 90 % de la surface de la vitre de sortie de lumière (3) est éclairée uniquement indirectement par les DEL (2).
  7. Lampe à DEL (1) selon l'une quelconque des revendications 1 à 6, caractérisée en ce que, dans une section en coupe traversant une des DEL (2) vue à travers la lampe à DEL (1), dans un secteur (a) de la surface de réflexion principale (5) situé plus éloigné de la DEL (2) en chaque point quelconque (11) dans ce secteur (a), l'angle (9) entre une tangente (10) appliquée à la surface de réflexion principale (5) et un rayon lumineux incident directement sur ce point (11) de la DEL (2) est plus grand que l'angle (12) que forme, en chaque point quelconque (14) dans un secteur (b) de la surface de réflexion principale (5) situé plus près de la DEL (2), une tangente appliquée à la surface de réflexion principale (5) avec un rayon lumineux incident directement sur ce point (14) de la DEL (2).
  8. Lampe à DEL (1) selon l'une quelconque des revendications 1 à 7, caractérisé en ce que, dans une section en coupe traversant une des DEL (2) vue à travers la lampe à DEL (1), la surface de réflexion principale (5) présente un contour cintré, de préférence cintré en permanence.
  9. Lampe à DEL (1) selon l'une quelconque des revendications précédentes 1 à 8, caractérisé en ce qu'une direction de rayonnement principale (8) de la lumière délivrée par les DEL (2) forme pour au moins une grande partie des DEL (2), de préférence pour toutes les DEL (2), un angle de +/- 45° avec le plan (13) de la vitre de sortie de lumière (3).
EP14003734.2A 2013-11-22 2014-11-06 Lampe à DEL Active EP2876363B1 (fr)

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ATA902/2013A AT514917B1 (de) 2013-11-22 2013-11-22 LED-Leuchte

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DE102017006424B4 (de) 2017-07-07 2022-04-21 Emz-Hanauer Gmbh & Co. Kgaa Leuchtvorrichtung zum Einbau in eine Wandfläche eines elektrischen Geräts der Haushaltsausstattung
DE202019105265U1 (de) * 2019-09-24 2021-01-04 Zumtobel Lighting Gmbh Leuchte mit Bereich zur flächigen Lichtabgabe
CN110529820B (zh) * 2019-10-12 2024-06-04 河南勇威特种设备有限公司 一种大功率长排警示灯
CN113606558B (zh) * 2021-07-12 2023-07-14 宁波公牛光电科技有限公司 光学结构和灯结构

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DE102007030186B4 (de) 2007-06-27 2009-04-23 Harald Hofmann Lineare LED-Lampe und Leuchtensystem mit derselben
US8000594B2 (en) * 2009-07-02 2011-08-16 Microscan Systems, Inc. Diffuse reflective illuminator
US8678616B2 (en) * 2009-07-21 2014-03-25 Abl Ip Holding Llc LED luminaire for display cases
US8197105B2 (en) * 2009-08-13 2012-06-12 Intematix Corporation LED-based lamps
DE102010061988A1 (de) 2010-11-25 2012-05-31 Osram Ag Lineare Beleuchtungsvorrichtung mit LEDs
WO2013010579A1 (fr) * 2011-07-18 2013-01-24 Osram Ag Élément de lampe et système de lampe
WO2013041993A2 (fr) * 2011-09-23 2013-03-28 Koninklijke Philips Electronics N.V. Luminaire à base de diodes électroluminescentes ayant une optique de mélange
WO2013098723A1 (fr) * 2011-12-27 2013-07-04 Koninklijke Philips Electronics N.V. Dispositif d'éclairage comprenant un dispositif réflecteur
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AT514917A4 (de) 2015-05-15

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