EP2039985A2 - LED lighting device with asymmetric light distribution, in particular for street lighting - Google Patents

LED lighting device with asymmetric light distribution, in particular for street lighting Download PDF

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Publication number
EP2039985A2
EP2039985A2 EP08016580A EP08016580A EP2039985A2 EP 2039985 A2 EP2039985 A2 EP 2039985A2 EP 08016580 A EP08016580 A EP 08016580A EP 08016580 A EP08016580 A EP 08016580A EP 2039985 A2 EP2039985 A2 EP 2039985A2
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EP
European Patent Office
Prior art keywords
light
led
main
guiding body
respect
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.)
Granted
Application number
EP08016580A
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German (de)
French (fr)
Other versions
EP2039985B1 (en
EP2039985A3 (en
Inventor
Michael Härtl
Stephan Lukanow
Janusz Teklak
Clemens Meyer
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.)
Osram SBT GmbH
Original Assignee
Siteco Beleuchtungstechnik GmbH
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Publication date
Application filed by Siteco Beleuchtungstechnik GmbH filed Critical Siteco Beleuchtungstechnik GmbH
Publication of EP2039985A2 publication Critical patent/EP2039985A2/en
Publication of EP2039985A3 publication Critical patent/EP2039985A3/en
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Publication of EP2039985B1 publication Critical patent/EP2039985B1/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00Lighting devices intended for fixed installation
    • F21S8/08Lighting devices intended for fixed installation with a standard
    • F21S8/085Lighting devices intended for fixed installation with a standard of high-built type, e.g. street light
    • F21S8/086Lighting devices intended for fixed installation with a standard of high-built type, e.g. street light with lighting device attached sideways of the standard, e.g. for roads and highways
    • 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
    • F21V5/00Refractors for light sources
    • F21V5/04Refractors for light sources of lens shape
    • 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
    • F21V7/00Reflectors for light sources
    • F21V7/0091Reflectors for light sources using total internal reflection
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21WINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/10Outdoor lighting
    • F21W2131/103Outdoor lighting of streets or roads
    • 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]

Definitions

  • the invention relates to the field of illumination devices whose light source is formed by a light emitting diode, short LED, and in particular an LED illumination device with an asymmetrical light distribution curve.
  • An illumination system with an LED element and a lighting lens in the form of a lens is in the DE 101 58 395 A1 disclosed.
  • the lens is provided according to this document provided with asymmetrical curved entrance and exit surfaces. The light emitted by the LED element is deflected asymmetrically with respect to the main emission direction of the LED element in order to illuminate a curved surface as evenly as possible.
  • the object of the invention is to provide an LED lighting device which is also suitable for complex lighting tasks.
  • the invention provides an LED illumination device which comprises at least one LED with a light emission which is preferably rotationally symmetrical with respect to a main emission direction of the LED and a light guide body which is formed from a light guide and has at least one light exit surface, light from the LED being coupled into the light guide body and at least a portion of the light is deflected in the light guide body so that it leaves the light guide body through the light exit surface with a light distribution which is asymmetrical with respect to the main emission of the LED, the light distribution in a sectional plane in which the main emission of the LED is and which Light exit surface cuts, defining a light distribution curve having a main maximum and at least one secondary maximum, wherein the main maximum is asymmetrical with respect to the main emission of the LED.
  • the light-guiding bodies are, for example, a full-thickness conductor which is formed entirely from a transparent material.
  • a hollow light guide is possible.
  • the fiber optic conductor is for example made of a transparent Material such as glass or plastic, eg PMMA, PU or PC, formed.
  • the light steering in the light-guiding body is effected by refraction and / or by reflection.
  • interfaces may also be mirrored to produce a reflection.
  • a main maximum of the light distribution curve is arranged asymmetrically with respect to the main emission direction of the LED.
  • the main maximum produces the necessary luminance (measured in cd / m 2 ) or illuminance (measured in 1 x) on a surface to be illuminated, while the secondary maximum is directed to other spatial areas to improve the uniformity of luminance or illuminance.
  • the LED lighting devices for a given lighting task can be set individually by aligning, with the alignment being able to take place by rotating the LED lighting device in the axis of the main emission direction of the LED.
  • the secondary maximum serves to even out the luminance in the spatial regions that are not reached by the main maximum of the luminous intensity distribution. It can be generated by the at least one secondary maximum and light accents independent of the main maximum of the light distribution curve. In a simplified embodiment of the LED illumination device, no secondary maximum is provided in the light distribution curve.
  • the main maximum lies in the sectional plane in which the axis of the main emission direction of the LED is perpendicular and which intersects the light exit window perpendicular to the LED main emission direction in an angle range between 45 ° and 80 °, preferably between 55 ° and 75 °.
  • the secondary maximum is preferably in the cutting plane with respect to the LED main emission direction in an angle range between -30 ° and 30 °, particularly preferably between -20 ° and 20 °.
  • the main maximum is arranged asymmetrically, it is preferred that the sub-maximum be at a small angle to the LED main emission direction or be approximately symmetrical to the LED main emission direction. This arrangement has the advantage that when turning the LED lighting device to the main emission of the LED, the main maximum individual can be steered in one direction, while the secondary maximum remains in approximately the same solid angle range regardless of the orientation of the main maximum.
  • the light-guiding body has a plurality of light exit surfaces, wherein according to a preferred embodiment one or more light exit surfaces are assigned to either the main maximum or a secondary maximum.
  • a light exit surface may output a narrowly focused bundle of light rays, while the second light exit surface may output a divergent bundle of light rays.
  • a desired location can be spot-illuminated with the main maximum, and the adjacent surroundings can be lightened with the divergent bundle of light beams.
  • the light-guiding body has one or more surfaces which are arranged opposite the LED so that a part of the light of the LED is totally reflected thereon.
  • the interfaces where the light is totally reflected can be either flat or curved. Due to the curvature, the corresponding light bundle, which is totally reflected at this interface, either expanded or bundled.
  • the surfaces of the light-guiding body, on which light radiation is reflected may also be mirrored. The mirrored surfaces may also be concave or convex in order to widen or focus the light beam.
  • the light-guiding body has one or more light entry surfaces through which the light from the LED is coupled into the light-guiding body.
  • the LED can also be integrated in the light-guiding body.
  • the plurality of light entry surfaces have the advantage that the incident light in the Lichtlenkgroper can be divided into several bundles, which are forwarded in the light guide body in different directions.
  • the light entry surfaces may also be curved in order to receive the corresponding beam when the light enters the light guide body focus or widen. In the case of a convexly curved light entry surface, the light bundle focuses on the light beam at the light entry surface, while the corresponding bundle is widened in the case of a concave light entry surface.
  • one or more light entry surfaces are arranged rotationally symmetrical about the LED main emission direction.
  • the direction of the main and secondary maximum can be adjusted around the main emission direction of the LED, without the LED having to be moved with the light-guiding body.
  • the light entry surface may at least partially extend parallel to the light exit surface.
  • the light of the LED when coupled into the light-guiding body is divided by a plurality of light entry surfaces into at least two, preferably three, light bundles. These light beams can then be directed independently of each other either towards the main maximum or to one of the secondary maxima.
  • the light bundles can be bundled or expanded independently of each other in the light guide body either directly on entry through one of the light entry surfaces, the light through a concave or convex curved light exit surface or total internal reflection within the light guide body at a concave or convex interfaces.
  • a plurality of light-guiding bundles can also be directed in the direction of the main maximum and / or one or more light bundles can be directed to the secondary maximum.
  • At least one light exit surface extends in a straight line in a direction perpendicular to the said sectional plane.
  • the light distribution of the light bundles emerging through the light exit surface is mirror-symmetrical formed with respect to a plane which is perpendicular to the rectilinear Lijnserstrekkung the light exit surface and the axis of the main emission of the LED contains.
  • a plurality of non-parallel sides may also be provided on the light-guiding body, on each of which at least one light-emitting surface is arranged.
  • a rectangular or an approximately square basic shape of the light guide body can be in four directions with an azimuthal angle of 0 °, 90 °, 180 ° or 270 ° relative to the main LED emission direction Maximas in the light distribution curve, i. either main or secondary maxima.
  • the asymmetry of the main maximum with respect to the main LED emission direction is nevertheless retained.
  • the previously described LED illumination devices are used in street lights.
  • the main maximum in the light distribution curve is used to illuminate the roadway, while the sub-maximum improves the uniformity of the light distribution on the evaluation area.
  • the invention relates to an outdoor lamp, such as a street lamp, with a board on which a plurality of LED lighting devices are installed, wherein each of the LED lighting devices at least one LED with respect to a main direction of the LED rotationally symmetrical light output and a light guide body comprises, which is formed of a light guide and having at least one light exit surface, wherein light of the LED is coupled in the light-guiding body and the light-guiding body deflects at least a portion of the light so that it leaves the light-guiding body through a light exit surface with a light distribution asymmetric with respect to Hauptabstrahlraum the LED is, and the light distribution in a sectional plane in which the main emission of the LED is located and the light entry surface intersects, defines a light distribution having a main maximum that asymmetrically with respect to the Main emission of the LED is.
  • the luminaire comprises a plurality of identical LED lighting devices according to embodiments as described above.
  • LED lighting devices with asymmetrical main maximum allows to set up the light for the desired lighting task in an advantageous manner.
  • street lights which are to illuminate an elongated portion of a road, the following preferred embodiments are provided.
  • the luminaire comprises a plurality of groups of LED lighting devices whose main maxima each have the same spatial orientation with respect to their LED main emission direction.
  • the orientation of two groups is arranged mirror-symmetrically with respect to a plane that intersects the board vertically.
  • this corresponds to the vertical plane of the luminaire transversely to the roadway longitudinal extent.
  • a first and a second group of LED lighting devices of the luminaire is provided, whose main maxima each have an azimuthal angle with respect to the LED main emission direction, which are aligned opposite to one another.
  • This embodiment of a luminaire generates a light distribution on the illuminated surface, such as the roadway, which extends symmetrically to both sides of the lamp.
  • a third and a fourth group of LED lighting devices is provided in the luminaire whose main maxima form an angle between 5 ° and 30 ° or between -5 ° and -30 ° with respect to the first and second group.
  • a Lichtbandknickung is generated, which is particularly advantageous for street lights, which are not centrally located above the road, but at the edge of the road. Due to the Lichtbandknickung despite the arrangement on the edge of the road, the width of the belt is largely uniformly illuminated.
  • further groups of LED lighting devices are provided which are symmetrical with respect to the plane perpendicular to the board, i. the vertical plane of the lamp, are arranged.
  • the LED lighting devices can also be provided variably positionable in the lamp.
  • the LED lighting device has an LED 1, which is arranged in a recess 2 of a light-guiding body 3.
  • the light-guiding body is in the illustrated embodiment a full-thickness conductor, which is formed throughout from a transparent plastic (PMMA).
  • the light-guiding body 3 has a longitudinal extent (in the image plane of FIG. 2 the horizontal), wherein the recess 2 extends laterally of the LED 1 substantially in the longitudinal direction of the light-guiding body 3.
  • the recess 2 is cut out on one longitudinal side and formed partially circular on the opposite longitudinal side.
  • the recess 2 in the light guide body 3 forms a total of three light entry surfaces 5, 6 and 7, which surround the LED 1.
  • the light entrance surface 5 opposite the LED in its main emission direction is curved convexly, while the side of the LED 1 arranged light entry surfaces 6 and 7 are in a sectional plane in which the main emission of the LED is straight.
  • the section plane corresponds to the image plane of FIGS. 1 and 3
  • the LED main emission direction corresponds to the vertical in the FIGS. 1 and 3 ,
  • the light emanating from the LED 1 passes through the light entry surfaces 5, 6 and 7 in the light guide body 3 and is thereby divided into three beams 8, 9 and 10.
  • the bundle of rays 9, which enters the light-guiding body 3 along the main emission direction of the LED 1 through the light entry surface 5, is slightly focused due to a convex curvature of the light entry surface 5 when light enters through light refraction.
  • the beam 9 In the further course of the beam 9 impinges on an interface 11 of the light-guiding body 3, which is arranged so that the beam 9 is totally reflected.
  • the interface 11 is also curved slightly convex, whereby the beam 9 is further focused.
  • the beam 9 leaves the light-guiding body through a light exit surface 12.
  • the light exit surface 12 is flat.
  • the bundle of rays 9, which leaves the light-guiding body somewhat focused, forms a main maximum 13 in the light-intensity distribution.
  • the main maximum 13 is in an angular range between 45 ° and 70 ° relative to the main emission direction of the LED.
  • the polar representation of the light intensity distribution is in FIG. 4 shown.
  • the 0 ° vertical in the FIG. 4 schematically corresponds to the main emission of the LED. 1
  • Another light beam 8 enters from the LED 1 through the light entrance surface 6 in the light guide body and leaves without further reflection the light guide body 3 by a flat light exit surface 14 which is arranged at a distance from the light exit surface 12 on the same side of the light guide body.
  • the beam 8 After the refraction at the light entry surface 6 and the light exit surface 14, the beam 8 has a direction which likewise corresponds to the angle range of the main maximum 13. In contrast to the beam 9, however, the beam 8 is widened more. In the light intensity distribution, the beam 8 ensures a widening of the main maximum 13.
  • the light beam 8 is formed approximately by the proportion of the light of the LED 1, which leaves the LED in the direction of the main maximum anyway. Due to the refraction at the light entry surface 6 and the light exit surface 14, the light beam 8 is deflected only slightly.
  • the third light bundle 10 enters the light-guiding body from the LED 1 through the light entry surface 7 and is totally reflected at a flat boundary surface 15.
  • the interface 15 is arranged opposite to the LED so that the light after total reflection leaves the interface 15 approximately parallel.
  • the beam 10 is passed through the light guide body 3, which forms a kind of channel for the light beam 10 in this area.
  • the channel is formed by approximately parallel interfaces 16 and 17 of the light-guiding body 3, which extend laterally offset from the main emission direction of the LED 1. Upon impact of light rays on these interfaces, for example, the interface 16 as in FIG. 3 shown, the radiation is reflected.
  • the light beam 10 exits through the light exit surface 18 from the channel 16, 17 of the light-guiding body 3 and leaves it in the direction of approximately + 15 ° relative to the main emission direction of the LED.
  • the beam 10 is in the light distribution curve, in FIG. 4 is shown, the secondary maximum 19 formed.
  • the secondary maximum 19 is deflected less than the main maximum 13 with respect to the main emission direction of the LED. This configuration is particularly favorable for various lighting tasks, for example for the formation of street lighting.
  • the main maximum 13 can be aligned in the direction of the roadway, while the secondary maximum 19 brightens an area laterally of the roadway approximately below the streetlight. Due to the asymmetry of the main maximum 13, it is possible by a variable positioning of the LED lighting fixture, i. by a rotation of the LED lighting body about the vertical axis, according to the invention possible to align the lighting fixture for desired lighting tasks. It is advantageous that the secondary maximum 19 is in an angular range of ⁇ 20 ° to the vertical of the illumination device, because it ensures illumination of the area below the lamp, regardless of the azimuthal orientation of the main maximum thirteenth
  • pins 20 are provided on an upper side, with the aid of which the lighting device is mechanically fastened in a lamp, for example on a circuit board.
  • the light-guiding body can be glued or soldered.
  • the light guide body is partly with Metal provided and formed of a heat-resistant material (greater than 185 ° C).
  • a variable positioning of the light-guiding body is possible.
  • a partially circular centering aid 4 is provided in the recess 2, which cooperates positively with the LED or another opposing component.
  • the LED 1 can either be firmly connected to the light-guiding body 3 or fixed on the opposite component of the luminaire.
  • the embodiment of the lighting fixture shown in the figures, in the plan view, as shown in the FIG. 2 is shown, an approximately rectangular basic shape, wherein the light exit surfaces 12 and 14 form parts of a serrated profile on one side.
  • light exit surfaces may be provided on opposite sides of the lighting fixture.
  • light exit surfaces may also be provided on non-opposite sides of the light exit body.
  • the light exit body may have an approximately square basic shape and light exit surfaces are formed on all four side surfaces.
  • the light-guiding body can also be designed in the form of a hollow light guide, the boundary surfaces described above being formed by walls of the light waveguide which are mirrored inwards.
  • the LED lighting fixture comprises a plurality of LEDs. These are, for example, in a row parallel to the longitudinal extension of the light exit window, ie perpendicular to the image plane of FIGS. 1 and 3 arranged.
  • the boundary surfaces and the light exit surfaces of the light guide body extend in a straight line parallel to the arranged in a row LEDs.
  • LEDs can be different Combined color in an LED lighting fixture, for example, to produce white light.
  • FIG. 6 shows a plan view of an outdoor lamp 21, which is a street lamp in the illustrated embodiment.
  • FIG. 6 shows a plan view of the light exit side of the street lamp 21, wherein a mast 22 to which the lamp 21 attached, is shown in cross section.
  • a common board 23 On a common board 23, a plurality of LED lighting devices are mounted, each comprising an LED 1 and a light-guiding body 3, as described above.
  • the board is flat in the illustrated embodiment. However, according to alternative embodiments, the board may also be curved along an axis, in particular along the longitudinal axis of the luminaire.
  • the plurality of LED illuminators partially have a different spatial arrangement relative to rotation about their respective LED main emission direction.
  • the LED lighting devices are arranged symmetrically with respect to a vertical plane through the lamp.
  • the LED lighting devices are aligned so that their respective main maxima are each aligned substantially perpendicular to both sides of the vertical plane. This results in a total symmetrical light distribution curve of the luminaire, which in the polar diagram in FIG. 7 is shown.
  • the main maxima 13 of all lighting devices are superimposed to two combined main maxima 13 ', which extend symmetrically on both sides of the lamp.
  • the secondary maxima 19 are superimposed to a combined secondary maximum 19 ', which is mirror-symmetrical with respect to the vertical plane through the lamp.
  • the street lamp 21 are only a part, but preferably the majority of all LED lighting devices oriented so that their main maxima extend opposite to the vertical plane of the luminaire.
  • Two further groups 32a and 32b of LED lighting devices are inclined at an angle of + 10 ° and -10 ° with respect to the transverse axis of the lamp.
  • Two further groups 33a and 33b are inclined at an angle of + 20 ° and -20 ° with respect to the transverse axis of the lamp.
  • the rays of the respective main maximum of the different LED groups are shown.
  • the luminous intensity which is directed at the surface to be illuminated, is symmetrical on both sides of the luminaire, but displaced forwards at an angle of approximately ⁇ 15 ° with respect to the transverse axis of the luminaire.
  • this Lichtbandknickung can be, for example, a street evenly illuminate over its width, even if the street lamp 21 is mounted on one longitudinal side of the road.
  • a multiplicity of luminaires 21, which in each case a Lichtbandknickung, like in the FIG. 9 shown the road can be illuminated almost uniformly over its length and width.
  • FIG. 10 FIG. 2 shows the light distribution curve in a cone-crest representation according to FIG. 9
  • the LED lighting devices are divided into only two groups, each occupying an angle of 0 ° to the transverse light extension (this corresponds to the group 31, as shown in FIG. 6 is shown).
  • Such a luminaire is preferred if only one street side is to be illuminated, as in FIG. 10 shown.
  • street lights can also be mounted centrally above the road to illuminate both road halves of the road.
  • the invention also provides, in particular, that the LED lighting devices can be variably positioned on the board. This makes it possible in particular different Lichtbandknickitch, as in connection with the FIGS. 9 and 10 described, realized by a luminaire type.

Abstract

The light emitting diode (LED) lighting device comprises a LED (1) with a main radiation pattern in a light emission of the LED and a light conducting body (3). The light distribution in a cutting plane defines a light distribution curve (12,14,18), where the main radiation pattern of the LED lies in the cutting plane. The light distribution curve has a main maximum and a secondary maximum, where the main maximum lies asymmetrically according to the main radiation pattern of the LED. An independent claim is included for a light with a circuit board.

Description

Die Erfindung betrifft das Gebiet von Beleuchtungseinrichtungen, deren Lichtquelle durch eine lichtemittierende Diode, kurz LED, gebildet wird, und insbesondere eine LED-Beleuchtungseinrichtung mit einer asymmetrischen Lichtverteilungskurve.The invention relates to the field of illumination devices whose light source is formed by a light emitting diode, short LED, and in particular an LED illumination device with an asymmetrical light distribution curve.

Ein Beleuchtungssystem mit einem LED-Element und einer Beleuchtungsoptik in Form einer Linse ist in der DE 101 58 395 A1 offenbart. Um eine möglichst gleichmäßige Beleuchtung auf einer gekrümmten Fläche zu erzeugen, ist gemäß dieser Druckschrift vorgesehen, die Linse mit asymmetrischen gekrümmten Eingangs- und Ausgangsflächen zu versehen. Das von dem LED-Element abgestrahlte Licht wird gegenüber der Hauptabstrahlrichtung des LED-Elements asymmetrisch umgelenkt, um eine gekrümmte Fläche möglichst gleichmäßig zu beleuchten.An illumination system with an LED element and a lighting lens in the form of a lens is in the DE 101 58 395 A1 disclosed. In order to produce the most uniform possible illumination on a curved surface, the lens is provided according to this document provided with asymmetrical curved entrance and exit surfaces. The light emitted by the LED element is deflected asymmetrically with respect to the main emission direction of the LED element in order to illuminate a curved surface as evenly as possible.

Obgleich es durch die in der DE 101 58 395 A1 offenbarten Beleuchtungseinrichtung möglich ist, das von dem LED-Element abgegebene Licht in eine gewünschte Richtung umzulenken, so eignet sich diese Beleuchtungsoptik dennoch nur zur gleichmäßigen Ausleuchtung verhältnismäßig einfach geformter Flächen. Für komplexere Beleuchtungsaufgabe müßte der Fachmann eine Vielzahl derartiger Beleuchtungseinrichtungen vorsehen, die individuell in unterschiedliche Richtungen mit einer jeweils gewünschten Intensität Licht abgeben.Although it is due to the in the DE 101 58 395 A1 disclosed lighting device is possible to redirect the light emitted from the LED element light in a desired direction, so this illumination optics is only suitable for uniform illumination of relatively simple shaped surfaces. For more complex lighting task, the skilled person would have to provide a plurality of such lighting devices that emit light in different directions with a particular desired intensity light.

Aufgabe der Erfindung ist es, eine LED-Beleuchtungseinrichtung zur Verfügung zu stellen, welche auch für komplexe Beleuchtungsaufgaben geeignet ist.The object of the invention is to provide an LED lighting device which is also suitable for complex lighting tasks.

Die Erfindung sieht eine LED-Beleuchtungseinrichtung vor, die wenigstens eine LED mit einer bezüglich einer Hauptabstrahlrichtung der LED vorzugsweise rotationssymmetrischen Lichtabgabe und einen Lichtlenkkörper umfaßt, das aus einem Lichtleiter gebildet ist und wenigstens eine Lichtaustrittsfläche aufweist, wobei Licht der LED in den Lichtlenkkörper eingekoppelt wird und wenigstens ein Teil des Licht so in dem Lichtlenkkörper umgelenkt wird, daß es den Lichtlenkkörper durch die Lichtaustrittsfläche mit einer Lichtverteilung verläßt, die asymmetrisch bezüglich der Hauptabstrahlrichtung der LED ist, wobei die Lichtverteilung in einer Schnittebene, in welcher die Hauptabstrahlrichtung der LED liegt und welche die Lichtaustrittsfläche schneidet, eine Lichtverteilungskurve definiert, die ein Hauptmaximum und wenigstens ein Nebenmaximum aufweist, wobei das Hauptmaximum asymmetrisch bezüglich der Hauptabstrahlrichtung der LED liegt.The invention provides an LED illumination device which comprises at least one LED with a light emission which is preferably rotationally symmetrical with respect to a main emission direction of the LED and a light guide body which is formed from a light guide and has at least one light exit surface, light from the LED being coupled into the light guide body and at least a portion of the light is deflected in the light guide body so that it leaves the light guide body through the light exit surface with a light distribution which is asymmetrical with respect to the main emission of the LED, the light distribution in a sectional plane in which the main emission of the LED is and which Light exit surface cuts, defining a light distribution curve having a main maximum and at least one secondary maximum, wherein the main maximum is asymmetrical with respect to the main emission of the LED.

Bei den Lichtlenkkörpern handelt es sich beispielsweise um einen Vollichtleiter, der durchgängig aus einem transparenten Material gebildet ist. In einer alternativen Ausführungsform ist auch ein Hohllichtleiter möglich. Der Vollichtleiter ist beispielsweise aus einem transparenten Material wie Glas oder Kunststoff, z.B. PMMA, PU oder PC, gebildet. Die Lichtlenkung im Lichtlenkkörper erfolgt durch Brechung und/oder durch Reflexion. Bei dem Volllichtleiter ist insbesondere auch Totalreflexion an ausgewählten Grenzflächen möglich. Alternativ können auch Grenzflächen verspiegelt sein, um eine Reflexion zu erzeugen.The light-guiding bodies are, for example, a full-thickness conductor which is formed entirely from a transparent material. In an alternative embodiment, a hollow light guide is possible. The fiber optic conductor is for example made of a transparent Material such as glass or plastic, eg PMMA, PU or PC, formed. The light steering in the light-guiding body is effected by refraction and / or by reflection. In the case of the full-light guide, in particular total reflection at selected interfaces is also possible. Alternatively, interfaces may also be mirrored to produce a reflection.

Erfindungsgemäß ist ein Hauptmaximum der Lichtverteilungskurve asymmetrisch bezüglich der Hauptabstrahlrichtung der LED angeordnet. Durch das Hauptmaximum wird die notwendige Leuchtdichte (gemessen in cd/m2) oder Beleuchtungsstärke (gemessen in 1x) auf einer zu beleuchtenden Fläche erzeugt, während das Nebenmaximum zur Verbesserung der Gleichmäßigkeit der Leuchtdichte oder Beleuchtungsstärke in andere Raumbereiche gelenkt wird. Durch das asymmetrische Hauptmaximum läßt sich durch Ausrichten die LED-Beleuchtungseinrichtungen für eine vorgegebene Beleuchtungsaufgabe individuell einstellen, wobei das Ausrichten durch ein Drehen der LED-Beleuchtungseinrichtung in der Achse der Hauptabstrahlrichtung der LED erfolgen kann. Das Nebenmaximum dient zur Vergleichmäßigung der Leuchtdichte in den Raumbereichen, die von dem Hauptmaximum der Leuchtstärkeverteilung nicht erreicht werden. Es lassen sich durch das wenigstens eine Nebenmaximum auch Lichtakzente unabhängig von dem Hauptmaximum der Lichtverteilungskurve erzeugen. In einer vereinfachten Ausführungsform der LED-Beleuchtungseinrichtung ist kein Nebenmaximum in der Lichtverteilungskurve vorgesehen.According to the invention, a main maximum of the light distribution curve is arranged asymmetrically with respect to the main emission direction of the LED. The main maximum produces the necessary luminance (measured in cd / m 2 ) or illuminance (measured in 1 x) on a surface to be illuminated, while the secondary maximum is directed to other spatial areas to improve the uniformity of luminance or illuminance. As a result of the asymmetrical main maximum, the LED lighting devices for a given lighting task can be set individually by aligning, with the alignment being able to take place by rotating the LED lighting device in the axis of the main emission direction of the LED. The secondary maximum serves to even out the luminance in the spatial regions that are not reached by the main maximum of the luminous intensity distribution. It can be generated by the at least one secondary maximum and light accents independent of the main maximum of the light distribution curve. In a simplified embodiment of the LED illumination device, no secondary maximum is provided in the light distribution curve.

Gemäß einer Ausführungsform liegt das Hauptmaximum in der Schnittebene, in der die Achse der Hauptabstrahlrichtung der LED liegt und die das Lichtaustrittsfenster senkrecht schneidet, gegenüber der LED-Hauptabstrahlrichtung in einem Winkelbereich zwischen 45° bis 80°, bevorzugt zwischen 55° und 75°. Das Nebenmaximum liegt vorzugsweise in der Schnittebene gegenüber der LED-Hauptabstrahlrichtung in einem Winkelbereich zwischen -30° und 30°, insbesondere bevorzugt zwischen -20° und 20°. Während das Hauptmaximum asymmetrisch angeordnet ist, ist es bevorzugt, daß das Nebenmaximum einen geringen Winkel zu der LED-Hauptabstrahlrichtung aufweist oder etwa symmetrisch zur LED-Hauptabstrahlrichtung ausgerichtet ist. Diese Anordnung hat den Vorteil, daß beim Drehen der LED-Beleuchtungseinrichtung um die Hauptabstrahlrichtung der LED das Hauptmaximum individuell in eine Richtung gelenkt werden kann, während das Nebenmaximum unabhängig von der Ausrichtung des Hauptmaximums in etwa dem gleichen Raumwinkelbereich verbleibt.According to one embodiment, the main maximum lies in the sectional plane in which the axis of the main emission direction of the LED is perpendicular and which intersects the light exit window perpendicular to the LED main emission direction in an angle range between 45 ° and 80 °, preferably between 55 ° and 75 °. The secondary maximum is preferably in the cutting plane with respect to the LED main emission direction in an angle range between -30 ° and 30 °, particularly preferably between -20 ° and 20 °. While the main maximum is arranged asymmetrically, it is preferred that the sub-maximum be at a small angle to the LED main emission direction or be approximately symmetrical to the LED main emission direction. This arrangement has the advantage that when turning the LED lighting device to the main emission of the LED, the main maximum individual can be steered in one direction, while the secondary maximum remains in approximately the same solid angle range regardless of the orientation of the main maximum.

Vorzugsweise weist der Lichtlenkkörper mehrere Lichtaustrittsflächen auf, wobei gemäß einer bevorzugten Ausführungsform jeweils eine oder mehrere Lichtaustrittsflächen entweder dem Hauptmaximum oder einem Nebenmaximum zugeordnet sind.Preferably, the light-guiding body has a plurality of light exit surfaces, wherein according to a preferred embodiment one or more light exit surfaces are assigned to either the main maximum or a secondary maximum.

Vorzugsweise sind zwei Lichtaustrittsflächen für das Hauptmaximum vorgesehen. Beispielsweise kann eine Lichtaustrittsfläche ein eng fokussiertes Bündel von Lichtstrahlen ausgeben, während die zweite Lichtaustrittsfläche ein divergentes Bündel von Lichtstrahlen ausgibt. Dadurch läßt sich mit dem Hauptmaximum ein gewünschter Ort punktförmig beleuchten und mit dem divergenten Bündel von Lichtstrahlen die angrenzende Umgebung aufhellen.Preferably, two light exit surfaces are provided for the main maximum. For example, a light exit surface may output a narrowly focused bundle of light rays, while the second light exit surface may output a divergent bundle of light rays. As a result, a desired location can be spot-illuminated with the main maximum, and the adjacent surroundings can be lightened with the divergent bundle of light beams.

Gemäß einer Ausführungsform weist der Lichtlenkkörper eine oder mehrere Flächen auf, die gegenüber der LED so angeordnet sind, daß ein Teil des Lichts der LED daran total reflektiert wird. Dadurch läßt sich in der Art eines Kanals das Licht zu der gewünschten Lichtaustrittsfläche in dem Lichtlenkkörper leiten. Die Grenzflächen, an denen das Licht total reflektiert wird, können entweder eben oder gewölbt sein. Durch die Wölbung wird das entsprechende Lichtbündel, das an dieser Grenzfläche total reflektiert wird, entweder aufgeweitet oder gebündelt. Alternativ können die Flächen des Lichtlenkkörpers, an denen Lichtstrahlung reflektiert wird, auch verspiegelt sein. Die verspiegelten Flächen können ebenso konkav oder konvex gewölbt sein, um das Lichtbündel aufzuweiten oder zu fokussieren.According to one embodiment, the light-guiding body has one or more surfaces which are arranged opposite the LED so that a part of the light of the LED is totally reflected thereon. As a result, the light can be guided in the manner of a channel to the desired light exit surface in the light-guiding body. The interfaces where the light is totally reflected can be either flat or curved. Due to the curvature, the corresponding light bundle, which is totally reflected at this interface, either expanded or bundled. Alternatively, the surfaces of the light-guiding body, on which light radiation is reflected, may also be mirrored. The mirrored surfaces may also be concave or convex in order to widen or focus the light beam.

Gemäß einer bevorzugten Ausführungsform weist der Lichtlenkkörper eine oder mehrere Lichteintrittsflächen auf, durch welche das Licht von der LED in den Lichtlenkkörper eingekoppelt wird. Alternativ kann die LED auch in dem Lichtlenkkörper integriert sein. Die mehreren Lichteintrittflächen haben den Vorteil, daß sich das in den Lichtlenkköper einfallende Licht in mehrere Bündel aufteilen läßt, die in dem Lichtlenkkörper in unterschiedliche Richtungen weitergeleitet werden. Insbesondere können die Lichteintrittsflächen auch gewölbt sein, um beim Eintritt des Lichts in den Lichtlenkkörper das entsprechende Strahlenbündel zu fokussieren oder aufzuweiten. Bei einer konvex gekrümmten Lichteintrittsfläche wird durch die Lichtbrechung an der Lichteintrittsfläche das entsprechende Strahlenbündel fokussiert, während bei einer konkaven Lichteintrittsfläche das entsprechende Bündel aufgeweitet wird.According to a preferred embodiment, the light-guiding body has one or more light entry surfaces through which the light from the LED is coupled into the light-guiding body. Alternatively, the LED can also be integrated in the light-guiding body. The plurality of light entry surfaces have the advantage that the incident light in the Lichtlenkköper can be divided into several bundles, which are forwarded in the light guide body in different directions. In particular, the light entry surfaces may also be curved in order to receive the corresponding beam when the light enters the light guide body focus or widen. In the case of a convexly curved light entry surface, the light bundle focuses on the light beam at the light entry surface, while the corresponding bundle is widened in the case of a concave light entry surface.

Gemäß einer Ausführungsform sind eine oder mehrere Lichteintrittsflächen rotationssymmetrisch um die LED-Hauptabstrahlrichtung angeordnet. Bei dieser Ausführungsform kann durch Drehen des Lichtlenkkörper gegenüber der LED die Richtung des Haupt- und Nebenmaximums um die Hauptabstrahlrichtung der LED eingestellt werden, ohne daß die LED mit dem Lichtlenkkörper mitbewegt werden muß. Diese Ausführungsform ist vorteilhaft für Anwendungen, bei denen die LED beispielsweise auf einer elektrischen Platine fest angeordnet ist und der Lichtlenkkörper in verschiedenen Stellungen auf der Platine angeordnet werden kann. Alternativ kann sich die Lichteintrittsfläche wenigstens abschnittsweise auch parallel zu der Lichtaustrittsfläche erstrecken.According to one embodiment, one or more light entry surfaces are arranged rotationally symmetrical about the LED main emission direction. In this embodiment, by turning the light-guiding body relative to the LED, the direction of the main and secondary maximum can be adjusted around the main emission direction of the LED, without the LED having to be moved with the light-guiding body. This embodiment is advantageous for applications in which the LED is fixedly arranged, for example, on an electrical circuit board and the light-guiding body can be arranged in various positions on the circuit board. Alternatively, the light entry surface may at least partially extend parallel to the light exit surface.

Gemäß einer bevorzugten Ausführungsform wird das Licht der LED beim Einkoppeln in den Lichtlenkkörper durch mehrere Lichteintrittsflächen in wenigstens zwei, bevorzugt drei Lichtbündel aufgeteilt. Diese Lichtbündel können anschließend unabhängig voneinander entweder in Richtung zu dem Hauptmaximum oder zu einem der Nebenmaxima gelenkt werden. Außerdem können die Lichtbündel unabhängig voneinander im Lichtlenkkörper gebündelt oder aufgeweitet werden entweder direkt beim Eintritt durch eine der Lichteintrittsflächen, beim Lichtaustritt durch eine konkav oder konvex gewölbte Lichtaustrittsfläche oder bei einer Totalreflexion innerhalb des Lichtlenkkörpers an einer konkaven oder konvexen Grenzflächen.According to a preferred embodiment, the light of the LED when coupled into the light-guiding body is divided by a plurality of light entry surfaces into at least two, preferably three, light bundles. These light beams can then be directed independently of each other either towards the main maximum or to one of the secondary maxima. In addition, the light bundles can be bundled or expanded independently of each other in the light guide body either directly on entry through one of the light entry surfaces, the light through a concave or convex curved light exit surface or total internal reflection within the light guide body at a concave or convex interfaces.

Insbesondere können auch mehrere Lichtlenkbündel in Richtung des Hauptmaximums gelenkt werden und/oder ein oder mehrere Lichtbündel zu dem Nebenmaximum gelenkt werden.In particular, a plurality of light-guiding bundles can also be directed in the direction of the main maximum and / or one or more light bundles can be directed to the secondary maximum.

Gemäß einer Ausführungsform erstreckt sich wenigstens eine Lichtaustrittsfläche in einer Richtung senkrecht zu der genannten Schnittebene gradlinig. Bei dieser Ausführungsform ist die Lichtverteilung des durch die Lichtaustrittsfläche austretenden Lichtbündel spiegelsymmetrisch bezüglich einer Ebene ausgebildet, die senkrecht zur der gradlinigen Längserstrekkung der Lichtaustrittsfläche liegt und die Achse der Hauptabstrahlrichtung der LED enthält.According to one embodiment, at least one light exit surface extends in a straight line in a direction perpendicular to the said sectional plane. In this embodiment, the light distribution of the light bundles emerging through the light exit surface is mirror-symmetrical formed with respect to a plane which is perpendicular to the rectilinear Längserstrekkung the light exit surface and the axis of the main emission of the LED contains.

Gemäß einer Ausführungsform können auch mehrere nicht-parallele Seiten an dem Lichtlenkkörper vorgesehen sein, an denen jeweils wenigstens eine Lichtaustrittsfläche angeordnet ist. Bei einer rechteckigen oder einem etwa quadratischen Grundform des Lichtlenkkörpers lassen sich in vier Richtungen mit einem Azimutalwinkel von 0°, 90°, 180° bzw. 270° bezogen auf die LED-Hauptabstrahlrichtung Maximas in der Lichtverteilungskurve, d.h. entweder Haupt- oder Nebenmaxima, erzeugen. Die Asymmetrie des Hauptmaximums bezüglich der LED-Hauptabstrahlrichtung bleibt dennoch erhalten.Vorzugsweise werden die vorhergehend beschriebenen LED-Beleuchtungseinrichtungen in Straßenleuchten eingesetzt. Das Hauptmaximum in der Lichtverteilungskurve wird zur Ausleuchtung der Fahrbahn genutzt, während das Nebenmaximum die Gleichmäßigkeit der Lichtverteilung auf der Bewertungsfläche verbessert. Durch eine variable Positionierung (insbesondere Drehung) des Lichtlenkkörpers oder der gesamten LED-Beleuchtungseinrichtung um die Hauptabstrahlrichtung der LED kann eine gewünschte Ausstrahlrichtung eingestellt werden.According to one embodiment, a plurality of non-parallel sides may also be provided on the light-guiding body, on each of which at least one light-emitting surface is arranged. In a rectangular or an approximately square basic shape of the light guide body can be in four directions with an azimuthal angle of 0 °, 90 °, 180 ° or 270 ° relative to the main LED emission direction Maximas in the light distribution curve, i. either main or secondary maxima. The asymmetry of the main maximum with respect to the main LED emission direction is nevertheless retained. Preferably, the previously described LED illumination devices are used in street lights. The main maximum in the light distribution curve is used to illuminate the roadway, while the sub-maximum improves the uniformity of the light distribution on the evaluation area. By a variable positioning (in particular rotation) of the light-guiding body or the entire LED illumination device around the main emission direction of the LED, a desired emission direction can be set.

Gemäß einem weiteren Aspekt betrifft die Erfindung eine Außenleuchte, wie z.B. eine Straßenleuchte, mit einer Platine, auf der mehrere LED-Beleuchtungseinrichtungen installiert sind, wobei jede der LED-Beleuchtungseinrichtungen wenigstens eine LED mit einer bezüglich einer Hauptabstrahlrichtung der LED-rotationssymmetrischen Lichtabgabe und einem Lichtlenkkörper umfaßt, der aus einem Lichtleiter gebildet ist und wenigstens eine Lichtaustrittsfläche aufweist, wobei Licht der LED in dem Lichtlenkkörper eingekoppelt wird und der Lichtlenkkörper wenigstens einen Teil des Lichts so umlenkt, daß es den Lichtlenkkörper durch eine Lichtaustrittsfläche mit einer Lichtverteilung verläßt, die asymmetrisch bezüglich der Hauptabstrahlrichtung der LED ist, und die Lichtverteilung in einer Schnittebene, in welcher die Hauptabstrahlrichtung der LED liegt und die Lichteintrittsfläche schneidet, eine Lichtverteilung definiert, die ein Hauptmaximum aufweist, das asymmetrisch bezüglich der Hauptabstrahlrichtung der LED liegt.According to a further aspect, the invention relates to an outdoor lamp, such as a street lamp, with a board on which a plurality of LED lighting devices are installed, wherein each of the LED lighting devices at least one LED with respect to a main direction of the LED rotationally symmetrical light output and a light guide body comprises, which is formed of a light guide and having at least one light exit surface, wherein light of the LED is coupled in the light-guiding body and the light-guiding body deflects at least a portion of the light so that it leaves the light-guiding body through a light exit surface with a light distribution asymmetric with respect to Hauptabstrahlrichtung the LED is, and the light distribution in a sectional plane in which the main emission of the LED is located and the light entry surface intersects, defines a light distribution having a main maximum that asymmetrically with respect to the Main emission of the LED is.

Vorzugsweise umfaßt die Leuchte mehrere gleiche LED-Beleuchtungseinrichtungen nach Ausführungsformen, wie sie vorhergehend beschrieben wurden.Preferably, the luminaire comprises a plurality of identical LED lighting devices according to embodiments as described above.

Die Verwendung von LED Beleuchtungseinrichtungen mit asymmetrischen Hauptmaximum erlaubt es in vorteilhafter Weise die Leuchte für die gewünschte Beleuchtungsaufgabe einzurichten. Insbesondere für Straßenleuchten, welche einen länglichen Abschnitt einer Fahrbahn ausleuchten sollen, sind folgende bevorzugte Ausführungsformen vorgesehen.The use of LED lighting devices with asymmetrical main maximum allows to set up the light for the desired lighting task in an advantageous manner. In particular, for street lights, which are to illuminate an elongated portion of a road, the following preferred embodiments are provided.

Gemäß einer Ausführungsform umfaßt die Leuchte mehrere Gruppen von LED-Beleuchtungseinrichtungen, deren Hauptmaxima jeweils die gleiche räumliche Orientierung bezüglich ihrer LED-Hauptabstrahlrichtung besitzen.According to one embodiment, the luminaire comprises a plurality of groups of LED lighting devices whose main maxima each have the same spatial orientation with respect to their LED main emission direction.

Vorzugsweise ist die Orientierung von zwei Gruppen spiegelsymmetrisch bezüglich einer Ebenen angeordnet, welche die Platine senkrecht schneidet. Bei einer auf die Fahrbahn gerichteten Straßenleuchte entspricht das der Vertikalebene der Leuchte quer zur Fahrbahnlängserstreckung.Preferably, the orientation of two groups is arranged mirror-symmetrically with respect to a plane that intersects the board vertically. In the case of a street lamp directed onto the roadway, this corresponds to the vertical plane of the luminaire transversely to the roadway longitudinal extent.

Gemäß einer bevorzugten Ausführungsform ist eine erste und eine zweite Gruppe von LED-Beleuchtungseinrichtungen der Leuchte vorgesehen, deren Hauptmaxima jeweils einem Azimutalwinkel gegenüber der LED-Hauptabstrahlrichtung aufweist, die entgegengesetzt zueinander ausgerichtet sind. Diese Ausführungsform einer Leuchte erzeugt eine Lichtverteilung auf der beleuchteten Fläche, wie z.B. die Fahrbahn, die sich symmetrisch zu beiden Seiten der Leuchte erstreckt. Gemäß einer weiteren bevorzugten Ausführungsform ist eine dritte und eine vierte Gruppe von LED-Beleuchtungseinrichtungen in der Leuchte vorgesehen, deren Hauptmaxima einen Winkel zwischen 5° und 30° bzw. zwischen -5° und -30° gegenüber der ersten und zweiten Gruppe bilden. Durch die dritte und vierte Gruppe von LED-Beleuchtungseinrichtungen wird eine Lichtbandknickung erzeugt, die insbesondere für Straßenleuchten von Vorteil ist, die nicht mittig über der Fahrbahn, sondern am Fahrbahnrand angeordnet sind. Durch die Lichtbandknickung wird trotz der Anordnung am Fahrbahnrand die Fahrband in ihrer Breite weitgehend gleichmäßig ausgeleuchtet.According to a preferred embodiment, a first and a second group of LED lighting devices of the luminaire is provided, whose main maxima each have an azimuthal angle with respect to the LED main emission direction, which are aligned opposite to one another. This embodiment of a luminaire generates a light distribution on the illuminated surface, such as the roadway, which extends symmetrically to both sides of the lamp. According to a further preferred embodiment, a third and a fourth group of LED lighting devices is provided in the luminaire whose main maxima form an angle between 5 ° and 30 ° or between -5 ° and -30 ° with respect to the first and second group. By the third and fourth group of LED lighting devices, a Lichtbandknickung is generated, which is particularly advantageous for street lights, which are not centrally located above the road, but at the edge of the road. Due to the Lichtbandknickung despite the arrangement on the edge of the road, the width of the belt is largely uniformly illuminated.

Gemäß einer weiteren Ausführungsform sind noch weitere Gruppen von LED-Beleuchtungseinrichtungen vorgesehen, die symmetrisch bezüglich der Ebene senkrecht zur Platine, d.h. der Vertikalebene der Leuchte, angeordnet sind. Insbesondere können die LED-Beleuchtungseinrichtungen auch variabel positionierbar in der Leuchte vorgesehen sein.According to a further embodiment, further groups of LED lighting devices are provided which are symmetrical with respect to the plane perpendicular to the board, i. the vertical plane of the lamp, are arranged. In particular, the LED lighting devices can also be provided variably positionable in the lamp.

Weitere Merkmale und Vorteile der vorliegenden Erfindung werden aus der nachfolgenden Beschreibung einer bevorzugten Ausführungsform deutlich. In den Figuren ist folgendes dargestellt:

Figur 1
zeigt eine Schnittdarstellung durch eine LED-Beleuchtungseinrichtung der vorliegenden Erfindung.
Figur 2
zeigt eine Aufsicht auf die LED-Beleuchtungseinrichtung der vorliegenden Erfindung.
Figur 3
zeigt eine Schnittdarstellung durch die LED-Beleuchtungseinrichtung nach Figur 1 mit der Schnittebene in der Mittelebenen und mit eingezeichnetem Lichtstrahlengang.
Figur 4
zeigt schematisch die Lichtverteilungskurve der LED-Beleuchtungseinrichtung in einer Schnittebene entsprechend der Figuren 1 und 3.
Figur 5
zeigt eine perspektivische Ansicht eines Lichtlenkkörpers der LED-Beleuchtungseinrichtung.
Figur 6
zeigt eine Aufsicht auf die Lichtaustrittsfläche einer Leuchte mit mehreren LED-Beleuchtungseinrichtungen gemäß der vorliegenden Erfindung.
Figur 7
zeigt schematisch die Lichtverteilungskurve der Leuchte nach Figur 6 in einer Polardarstellung.
Figur 8
zeigt eine Aufsicht auf die Leuchte gemäß Figur 6 mit eingezeichnetem Lichtstrahlengang entlang der Richtung der Hauptmaxima.
Figur 9
zeigt die Lichtverteilungskurve einer Leuchte entsprechend der Figur 7 in einer Kegelmantelkurve auf einer zu beleuchtenden Straße.
Figur 10
zeigt die Lichtverteilungskurve in einer Kegelmantelkurve auf einer zu beleuchtenden Straße einer alternativen Ausführungsform einer Leuchte.
Other features and advantages of the present invention will become apparent from the following description of a preferred embodiment. The figures show the following:
FIG. 1
shows a sectional view through an LED lighting device of the present invention.
FIG. 2
shows a plan view of the LED lighting device of the present invention.
FIG. 3
shows a sectional view of the LED lighting device after FIG. 1 with the cutting plane in the middle planes and with marked light beam path.
FIG. 4
schematically shows the light distribution curve of the LED lighting device in a sectional plane corresponding to FIGS. 1 and 3 ,
FIG. 5
shows a perspective view of a light-guiding body of the LED lighting device.
FIG. 6
shows a plan view of the light-emitting surface of a lamp with multiple LED lighting devices according to the present invention.
FIG. 7
schematically shows the light distribution curve of the luminaire FIG. 6 in a polar representation.
FIG. 8
shows a plan view of the lamp according to FIG. 6 with drawn light beam path along the direction of the main maxima.
FIG. 9
shows the light distribution curve of a lamp according to the FIG. 7 in a cone-shaped curve on a street to be illuminated.
FIG. 10
shows the light distribution curve in a cone-shaped curve on a street to be illuminated of an alternative embodiment of a luminaire.

Die LED-Beleuchtungseinrichtung weist eine LED 1 auf, die in einer Vertiefung 2 eines Lichtlenkkörpers 3 angeordnet ist. Der Lichtlenkkörper ist in der dargestellten Ausführungsform ein Vollichtleiter, der durchgängig aus einem transparenten Kunststoff (PMMA) gebildet ist.The LED lighting device has an LED 1, which is arranged in a recess 2 of a light-guiding body 3. The light-guiding body is in the illustrated embodiment a full-thickness conductor, which is formed throughout from a transparent plastic (PMMA).

Wie in der Aufsicht gemäß Figur 2 zu sehen ist, weist der Lichtlenkkörper 3 eine Längserstreckung auf (in der Bildebene der Figur 2 die Horizontale), wobei sich die Vertiefung 2 seitlich der LED 1 im wesentlichen in Längsrichtung des Lichtlenkkörpers 3 erstreckt. Wie in der perspektivischen Darstellung nach Figur 5, welche den Lichtlenkkörper 3 ohne LED zeigt, gut zu sehen ist, ist die Vertiefung 2 auf einer Längsseite ausgeschnitten und auf der gegenüberliegenden Längsseite teilweise kreisförmig ausgebildet.As in the supervision according to FIG. 2 can be seen, the light-guiding body 3 has a longitudinal extent (in the image plane of FIG. 2 the horizontal), wherein the recess 2 extends laterally of the LED 1 substantially in the longitudinal direction of the light-guiding body 3. As in the perspective view FIG. 5 , which shows the light guide body 3 without LED, can be clearly seen, the recess 2 is cut out on one longitudinal side and formed partially circular on the opposite longitudinal side.

Die Vertiefung 2 in dem Lichtlenkkörper 3 bildet insgesamt drei Lichteintrittsflächen 5, 6 und 7, welche die LED 1 umgeben. Die der LED in ihrer Hauptabstrahlrichtung gegenüberliegende Lichteintrittsfläche 5 ist konvex gewölbt, während die seitlich der LED 1 angeordneten Lichteintrittsflächen 6 und 7 in einer Schnittebene, in der die Hauptabstrahlrichtung der LED liegt gradlinig sind. Die Schnittebene entspricht der Bildebene der Figuren 1 und 3. Die LED-Hauptabstrahlrichtung entspricht der Vertikalen in den Figuren 1 und 3.The recess 2 in the light guide body 3 forms a total of three light entry surfaces 5, 6 and 7, which surround the LED 1. The light entrance surface 5 opposite the LED in its main emission direction is curved convexly, while the side of the LED 1 arranged light entry surfaces 6 and 7 are in a sectional plane in which the main emission of the LED is straight. The section plane corresponds to the image plane of FIGS. 1 and 3 , The LED main emission direction corresponds to the vertical in the FIGS. 1 and 3 ,

Wie in der Figur 3 dargestellt ist, tritt das von der LED 1 ausgehende Licht durch die Lichteintrittsflächen 5, 6 und 7 in den Lichtlenkkörper 3 ein und wird dabei in drei Strahlenbündel 8, 9 und 10 aufgeteilt. Das Strahlenbündel 9, welches entlang der Hauptabstrahlrichtung der LED 1 durch die Lichteintrittsfläche 5 in den Lichtlenkkörper 3 eintritt, wird aufgrund einer konvexen Wölbung der Lichteintrittsfläche 5 beim Lichteintritt durch Lichtbrechung etwas fokussiert.Like in the FIG. 3 is shown, the light emanating from the LED 1 passes through the light entry surfaces 5, 6 and 7 in the light guide body 3 and is thereby divided into three beams 8, 9 and 10. The bundle of rays 9, which enters the light-guiding body 3 along the main emission direction of the LED 1 through the light entry surface 5, is slightly focused due to a convex curvature of the light entry surface 5 when light enters through light refraction.

Im weiteren Verlauf trifft das Strahlenbündel 9 auf eine Grenzfläche 11 des Lichtlenkkörpers 3 auf, die so angeordnet ist, daß das Strahlenbündel 9 totalreflektiert wird. Die Grenzfläche 11 ist ebenfalls etwas konvex gekrümmt, wodurch das Strahlenbündel 9 weiter fokussiert wird. Nach der Totalreflexion an der Grenzfläche 11 verläßt das Strahlenbündel 9 den Lichtlenkkörper durch eine Lichtaustrittsfläche 12. Die Lichtaustrittsfläche 12 ist eben ausgebildet. Das Strahlenbündel 9, das den Lichtlenkkörper etwas fokussiert verläßt, bildet ein Hauptmaximum 13 in der Lichtstärkeverteilung. Das Hauptmaximum 13 liegt in einem Winkelbereich zwischen 45° und 70° bezogen auf die Hauptabstrahlrichtung der LED. Die Polardarstellung der Lichtstärkeverteilung ist in Figur 4 dargestellt. Die 0°-Vertikale in der Figur 4 schematisch entspricht der Hauptabstrahlrichtung der LED 1.In the further course of the beam 9 impinges on an interface 11 of the light-guiding body 3, which is arranged so that the beam 9 is totally reflected. The interface 11 is also curved slightly convex, whereby the beam 9 is further focused. After total reflection at the interface 11, the beam 9 leaves the light-guiding body through a light exit surface 12. The light exit surface 12 is flat. The bundle of rays 9, which leaves the light-guiding body somewhat focused, forms a main maximum 13 in the light-intensity distribution. The main maximum 13 is in an angular range between 45 ° and 70 ° relative to the main emission direction of the LED. The polar representation of the light intensity distribution is in FIG. 4 shown. The 0 ° vertical in the FIG. 4 schematically corresponds to the main emission of the LED. 1

Ein weiteres Lichtbündel 8 tritt ausgehend von der LED 1 durch die Lichteintrittsfläche 6 in den Lichtlenkkörper ein und verläßt ohne weitere Reflexion den Lichtlenkkörper 3 durch eine ebene Lichtaustrittsfläche 14, die in einem Abstand zu der Lichtaustrittsfläche 12 auf der gleichen Seite des Lichtlenkkörpers angeordnet ist. Das Strahlenbündel 8 weist nach der Brechung an der Lichteintrittsfläche 6 und der Lichtaustrittsfläche 14 eine Richtung auf, die ebenfalls dem Winkelbereich des Hauptmaximums 13 entspricht. Im Unterschied zu dem Strahlenbündel 9 ist das Strahlenbündel 8 jedoch stärker aufgeweitet. In der Lichtstärkeverteilung sorgt das Strahlenbündel 8 für eine Verbreiterung des Hauptmaximums 13. Das Lichtbündel 8 wird etwa durch den Anteil des Lichts der LED 1 gebildet, der ohnehin die LED in Richtung des Hauptmaximums verläßt. Durch die Brechung an der Lichteintrittsfläche 6 und der Lichtaustrittsfläche 14 wird das Lichtbündel 8 nur geringfügig abgelenkt.Another light beam 8 enters from the LED 1 through the light entrance surface 6 in the light guide body and leaves without further reflection the light guide body 3 by a flat light exit surface 14 which is arranged at a distance from the light exit surface 12 on the same side of the light guide body. After the refraction at the light entry surface 6 and the light exit surface 14, the beam 8 has a direction which likewise corresponds to the angle range of the main maximum 13. In contrast to the beam 9, however, the beam 8 is widened more. In the light intensity distribution, the beam 8 ensures a widening of the main maximum 13. The light beam 8 is formed approximately by the proportion of the light of the LED 1, which leaves the LED in the direction of the main maximum anyway. Due to the refraction at the light entry surface 6 and the light exit surface 14, the light beam 8 is deflected only slightly.

Das dritte Lichtbündel 10 tritt von der LED 1 durch die Lichteintrittsfläche 7 in den Lichtlenkkörper ein und wird an einer ebenen Grenzfläche 15 total reflektiert. Die Grenzfläche 15 ist gegenüber der LED so angeordnet, daß das Licht nach der Totalreflexion die Grenzfläche 15 etwa parallel verläßt. Danach wird das Strahlenbündel 10 durch den Lichtlenkkörper 3 geleitet, der in diesem Bereich eine Art Kanal für das Lichtbündel 10 bildet. Der Kanal wird durch etwa parallele Grenzflächen 16 und 17 des Lichtlenkkörpers 3 gebildet, die sich seitlich versetzt zu der Hauptabstrahlrichtung der LED 1 erstrecken. Beim Auftreffen von Lichtstrahlen auf diese Grenzflächen, beispielsweise die Grenzfläche 16 wie in Figur 3 dargestellt, wird die Strahlung reflektiert. Schließlich tritt das Lichtbündel 10 durch die Lichtaustrittsfläche 18 aus dem Kanal 16, 17 des Lichtlenkkörpers 3 aus und verläßt diesen in Richtung von etwa +15° bezogen auf die Hauptabstrahlrichtung der LED. Durch das Strahlenbündel 10 wird in der Lichtverteilungskurve, die in Figur 4 dargestellt ist, das Nebenmaximum 19 gebildet.The third light bundle 10 enters the light-guiding body from the LED 1 through the light entry surface 7 and is totally reflected at a flat boundary surface 15. The interface 15 is arranged opposite to the LED so that the light after total reflection leaves the interface 15 approximately parallel. Thereafter, the beam 10 is passed through the light guide body 3, which forms a kind of channel for the light beam 10 in this area. The channel is formed by approximately parallel interfaces 16 and 17 of the light-guiding body 3, which extend laterally offset from the main emission direction of the LED 1. Upon impact of light rays on these interfaces, for example, the interface 16 as in FIG. 3 shown, the radiation is reflected. Finally, the light beam 10 exits through the light exit surface 18 from the channel 16, 17 of the light-guiding body 3 and leaves it in the direction of approximately + 15 ° relative to the main emission direction of the LED. By the beam 10 is in the light distribution curve, in FIG. 4 is shown, the secondary maximum 19 formed.

Das Nebenmaximum 19 ist gegenüber der Hauptabstrahlrichtung der LED weniger abgelenkt als das Hauptmaximum 13. Diese Konfiguration ist besonders günstig für verschiedene Beleuchtungsaufgaben, beispielsweise zur Ausbildung von Straßenbeleuchtung. Das Hauptmaximum 13 kann in Richtung der Fahrbahn ausgerichtet werden, während das Nebenmaximum 19 einen Bereich seitlich der Fahrbahn etwa unterhalb der Straßenleuchte aufhellt. Durch die Asymmetrie des Hauptmaximums 13 ist es durch eine variable Positionierung des LED-Beleuchtungskörpers, d.h. durch eine Drehung des LED-Beleuchtungskörpers um die vertikale Achse, erfindungsgemäß möglich, den Beleuchtungskörper für gewünschte Beleuchtungsaufgaben auszurichten. Dabei ist von Vorteil, daß das Nebenmaximum 19 in einem Winkelbereich von ±20° zur Vertikalen der Beleuchtungseinrichtung liegt, weil es eine Ausleuchtung des Bereichs unterhalb der Leuchte gewährleistet, unabhängig von der azimutalen Ausrichtung des Hauptmaximums 13.The secondary maximum 19 is deflected less than the main maximum 13 with respect to the main emission direction of the LED. This configuration is particularly favorable for various lighting tasks, for example for the formation of street lighting. The main maximum 13 can be aligned in the direction of the roadway, while the secondary maximum 19 brightens an area laterally of the roadway approximately below the streetlight. Due to the asymmetry of the main maximum 13, it is possible by a variable positioning of the LED lighting fixture, i. by a rotation of the LED lighting body about the vertical axis, according to the invention possible to align the lighting fixture for desired lighting tasks. It is advantageous that the secondary maximum 19 is in an angular range of ± 20 ° to the vertical of the illumination device, because it ensures illumination of the area below the lamp, regardless of the azimuthal orientation of the main maximum thirteenth

Um die LED-Beleuchtungseinrichtung in einer Leuchte zu installieren, sind auf einer Oberseite Zapfen 20 vorgesehen, mit deren Hilfe die Beleuchtungseinrichtung in einer Leuchte, beispielsweise an einer Platine, mechanisch befestigt wird. Insbesondere kann der Lichtlenkkörper angeklebt oder angelötet werden. In letzterem Fall ist der Lichtlenkkörper teilweise mit Metall versehen und aus einem hitzebeständigen Material (größer 185°C) gebildet. Insbesondere ist eine variable Positionierung des Lichtlenkkörpers möglich. Dazu ist eine teilweise kreisförmige Zentrierhilfe 4 in der Vertiefung 2 vorgesehen, die formschlüssig mit der LED oder einem anderen gegenüberliegenden Bauelement zusammenwirkt. Die LED 1 kann entweder fest mit dem Lichtlenkkörper 3 verbunden sein oder auf dem gegenüberliegenden Bauelement der Leuchte befestigt sein.In order to install the LED lighting device in a lamp, pins 20 are provided on an upper side, with the aid of which the lighting device is mechanically fastened in a lamp, for example on a circuit board. In particular, the light-guiding body can be glued or soldered. In the latter case, the light guide body is partly with Metal provided and formed of a heat-resistant material (greater than 185 ° C). In particular, a variable positioning of the light-guiding body is possible. For this purpose, a partially circular centering aid 4 is provided in the recess 2, which cooperates positively with the LED or another opposing component. The LED 1 can either be firmly connected to the light-guiding body 3 or fixed on the opposite component of the luminaire.

Die in den Figuren dargestellte Ausführungsform des Beleuchtungskörpers weist in der Aufsicht, wie sie in der Figur 2 dargestellt ist, eine etwa rechteckige Grundform auf, wobei die Lichtaustrittsflächen 12 und 14 Teile eines zackenartigen Profils auf einer Seite bilden.The embodiment of the lighting fixture shown in the figures, in the plan view, as shown in the FIG. 2 is shown, an approximately rectangular basic shape, wherein the light exit surfaces 12 and 14 form parts of a serrated profile on one side.

Gemäß anderen Ausführungsformen können Lichtaustrittsflächen an gegenüberliegenden Seiten des Beleuchtungskörpers vorgesehen sein. Ferner können gemäß einer alternativen Ausführungsform auch Lichtaustrittsflächen an nicht gegenüberliegenden Seiten des Lichtaustrittskörpers vorgesehen sein. Beispielsweise kann der Lichtaustrittskörper eine etwa quadratische Grundform aufweisen und Lichtaustrittsflächen sind an allen vier Seitenflächen gebildet. Diese Ausführungsformen erzeugen mehrere asymmetrische Hauptmaxima, die bezüglich der Hauptabstrahlrichtung der LED in einem unterschiedlichen Azimutalwinkelbereich ausgerichtet sind.According to other embodiments, light exit surfaces may be provided on opposite sides of the lighting fixture. Furthermore, according to an alternative embodiment, light exit surfaces may also be provided on non-opposite sides of the light exit body. For example, the light exit body may have an approximately square basic shape and light exit surfaces are formed on all four side surfaces. These embodiments produce a plurality of main asymmetrical maxima which are aligned in a different azimuthal angle range with respect to the main emission direction of the LED.

Weitere Ausführungsformen der LED-Beleuchtungseinrichtung sind im Rahmen der Erfindung möglich. Beispielsweise kann der Lichtlenkkörper auch in Form eines Hohllichtleiters ausgebildet sein, wobei die vorhergehend beschriebenen Grenzflächen durch nach innen verspiegelte Wände des Hohllichtleiters gebildet werden.Further embodiments of the LED illumination device are possible within the scope of the invention. For example, the light-guiding body can also be designed in the form of a hollow light guide, the boundary surfaces described above being formed by walls of the light waveguide which are mirrored inwards.

Gemäß einer weiteren Ausführungsform umfaßt der LED-Beleuchtungskörper mehrere LEDs. Diese sind beispielsweise in einer Reihe parallel zur Längserstreckung der Lichtaustrittsfenster, d.h. senkrecht zur Bildebene der Figuren 1 und 3 angeordnet. Bei dieser Ausführungsform erstrecken sich die Grenzflächen und die Lichtaustrittsflächen des Lichtlenkkörpers gradlinig parallel zu der in einer Reihe angeordneten LEDs. Insbesondere können LEDs unterschiedlicher Farbe in einem LED-Beleuchtungskörper kombiniert sein, beispielsweise um weißes Licht zu erzeugen.According to a further embodiment, the LED lighting fixture comprises a plurality of LEDs. These are, for example, in a row parallel to the longitudinal extension of the light exit window, ie perpendicular to the image plane of FIGS. 1 and 3 arranged. In this embodiment, the boundary surfaces and the light exit surfaces of the light guide body extend in a straight line parallel to the arranged in a row LEDs. In particular, LEDs can be different Combined color in an LED lighting fixture, for example, to produce white light.

Gemäß einem weiteren Aspekt der Erfindung sind eine Vielzahl der vorhergehend beschriebenen Beleuchtungskörper in einer Leuchte, wie sie in Figur 6 dargestellt ist, kombiniert. Die Figur 6 zeigt eine Aufsicht auf eine Außenleuchte 21, wobei es sich in der dargestellten Ausführungsform um eine Straßenleuchte handelt.According to another aspect of the invention, a plurality of the lighting fixtures described above are in a luminaire as shown in FIG FIG. 6 is shown combined. The FIG. 6 shows a plan view of an outdoor lamp 21, which is a street lamp in the illustrated embodiment.

Die Figur 6 zeigt eine Aufsicht auf die Lichtaustrittsseite der Straßenleuchte 21, wobei ein Mast 22, an dem die Leuchte 21 angebracht, im Querschnitt dargestellt ist. Auf einer gemeinsamen Platine 23 sind eine Vielzahl von LED-Beleuchtungseinrichtungen angebracht, die jeweils ein LED 1 und einen Lichtlenkkörper 3, wie vorhergehend beschrieben, umfassen. Die Platine ist in der dargestellten Ausführungsform eben ausgeführt. Gemäß alternativen Ausführungsformen kann die Platine jedoch auch entlang einer Achse, insbesondere entlang der Längsachse der Leuchte, gekrümmt sein.The FIG. 6 shows a plan view of the light exit side of the street lamp 21, wherein a mast 22 to which the lamp 21 attached, is shown in cross section. On a common board 23, a plurality of LED lighting devices are mounted, each comprising an LED 1 and a light-guiding body 3, as described above. The board is flat in the illustrated embodiment. However, according to alternative embodiments, the board may also be curved along an axis, in particular along the longitudinal axis of the luminaire.

Die Vielzahl von LED-Beleuchtungseinrichtungen besitzt teilweise eine unterschiedliche räumliche Anordnung bezüglich einer Drehung um ihre jeweilige LED-Hauptabstrahlrichtung. Die LED-Beleuchtungseinrichtungen sind bezüglich einer Vertikalebene durch die Leuchte symmetrisch angeordnet. Die LED-Beleuchtungseinrichtungen sind dabei so ausgerichtet, daß ihre jeweiligen Hauptmaxima im wesentlichen jeweils senkrecht zu beiden Seiten der Vertikalebene ausgerichtet sind. Dadurch ergibt sich insgesamt eine symmetrische Lichtverteilungskurve der Leuchte, die im Polardiagramm in Figur 7 dargestellt ist. Die Hauptmaxima 13 aller Beleuchtungseinrichtungen überlagern sich dabei zu zwei kombinierten Hauptmaxima 13', die sich zu beiden Seiten der Leuchte symmetrisch erstrecken. Die Nebenmaxima 19 überlagern sich zu einem kombinierten Nebenmaximum 19', das spiegelsymmetrisch bezüglich der vertikalen Ebene durch die Leuchte ist.The plurality of LED illuminators partially have a different spatial arrangement relative to rotation about their respective LED main emission direction. The LED lighting devices are arranged symmetrically with respect to a vertical plane through the lamp. The LED lighting devices are aligned so that their respective main maxima are each aligned substantially perpendicular to both sides of the vertical plane. This results in a total symmetrical light distribution curve of the luminaire, which in the polar diagram in FIG. 7 is shown. The main maxima 13 of all lighting devices are superimposed to two combined main maxima 13 ', which extend symmetrically on both sides of the lamp. The secondary maxima 19 are superimposed to a combined secondary maximum 19 ', which is mirror-symmetrical with respect to the vertical plane through the lamp.

Gemäß der in Figur 6 dargestellten Ausführungsform der Straßenleuchte 21 sind nur ein Teil, vorzugsweise jedoch der überwiegende Teil, aller LED-Beleuchtungseinrichtungen so orientiert, daß sich ihre Hauptmaxima entgegengesetzt bezüglich der Vertikalebene der Leuchte erstrecken. Dies trifft nur für die Gruppen 31a und 31b von LED-Beleuchtungseinrichtungen zu. Diese sind mit jeweils 0° gegenüber einer Achse quer zur Leuchtenlängsachse ausgerichtet. Zwei weitere Gruppen 32a und 32b von LED-Beleuchtungseinrichtungen sind mit einem Winkel von +10° bzw. -10° gegenüber der Leuchtenquerachse geneigt. Noch zwei weitere Gruppen 33a und 33b ist mit einem Winkel von +20° bzw. -20° gegenüber der Leuchtenquerachse geneigt. In der Figur 8 sind die Strahlen des jeweiligen Hauptmaximums der unterschiedlichen LED-Gruppen dargestellt. Wie in der Aufsicht zu sehen ist, erstrecken sich zu beiden Seiten der Leuchten jeweils drei Strahlenbündel, die einen Winkel von 0°, ±10° bzw. ±20° gegenüber der Leuchtenquerachse einnehmen. Daraus ergibt sich eine Lichtkurvenverteilung auf einer zu beleuchtenden Fläche, die als Kegelmantelkurve (d.h. eine Polardarstellung der Lichtstärke entlang des Schnitts eines Kegelmantels mit einem vorgegebenen Öffnungswinkel um die Vertikale der Leuchte) in der Figur 9 dargestellt ist. Die Besonderheit der Lichtverteilungskurve ist die Lichtbandknickung, die durch die Gruppen 32a,b und 33a,b der LED-Beleuchtungskörper erzielt wird. Die Lichtstärke, die auf der zu beleuchtenden Fläche gerichtet wird, ist zu beiden Seiten der Leuchte symmetrisch, jedoch mit einem Winkel von etwa ±15° bezüglich der Leuchtenquerachse nach vorne verlagert. Durch diese Lichtbandknickung läßt sich beispielsweise eine Straße gleichmäßig über ihre Breite beleuchten, auch wenn die Straßenleuchte 21 an einer Längsseite der Straße montiert ist. Durch eine Vielzahl von Leuchten 21, die jeweils eine Lichtbandknickung, wie in der Figur 9 dargestellt, aufweisen, kann die Straße über ihre Länge und Breite nahezu gleichmäßig ausgeleuchtet werden.According to the in FIG. 6 illustrated embodiment of the street lamp 21 are only a part, but preferably the majority of all LED lighting devices oriented so that their main maxima extend opposite to the vertical plane of the luminaire. This only applies to the groups 31a and 31b of LED lighting devices. These are each aligned with 0 ° relative to an axis transverse to the longitudinal axis of the lamp. Two further groups 32a and 32b of LED lighting devices are inclined at an angle of + 10 ° and -10 ° with respect to the transverse axis of the lamp. Two further groups 33a and 33b are inclined at an angle of + 20 ° and -20 ° with respect to the transverse axis of the lamp. In the FIG. 8 the rays of the respective main maximum of the different LED groups are shown. As can be seen in the plan, three beams extend on both sides of the luminaires, occupying an angle of 0 °, ± 10 ° and ± 20 ° respectively with respect to the transverse axis of the lamp. This results in a light curve distribution on a surface to be illuminated, which is a conical envelope curve (ie a polar representation of the light intensity along the section of a cone shroud with a predetermined opening angle around the vertical of the luminaire) in the FIG. 9 is shown. The peculiarity of the light distribution curve is the Lichtbandknickung, which is achieved by the groups 32 a, b and 33 a, b of the LED lighting fixture. The luminous intensity, which is directed at the surface to be illuminated, is symmetrical on both sides of the luminaire, but displaced forwards at an angle of approximately ± 15 ° with respect to the transverse axis of the luminaire. By this Lichtbandknickung can be, for example, a street evenly illuminate over its width, even if the street lamp 21 is mounted on one longitudinal side of the road. By a multiplicity of luminaires 21, which in each case a Lichtbandknickung, like in the FIG. 9 shown, the road can be illuminated almost uniformly over its length and width.

Die Figur 10 zeigt die Lichtverteilungskurve in einer Kegelmantelkurvendarstellung entsprechend der Figur 9, jedoch für eine alternative Ausführungsform der Leuchte, bei der die LED-Beleuchtungseinrichtungen in nur zwei Gruppen eingeteilt sind, die jeweils einen Winkel von 0° zur Leuchtenquererstreckung einnehmen (dies entspricht der Gruppe 31, wie sie in Figur 6 dargestellt ist). Eine derartige Leuchte ist bevorzugt, wenn nur eine Straßenseite beleuchtet werden soll, wie in Figur 10 dargestellt. Alternativ können derartige Straßenleuchten auch mittig über der Fahrbahn angebracht werden, um beide Fahrbahnhälften der Straße zu beleuchten.The FIG. 10 FIG. 2 shows the light distribution curve in a cone-crest representation according to FIG FIG. 9 However, for an alternative embodiment of the luminaire, in which the LED lighting devices are divided into only two groups, each occupying an angle of 0 ° to the transverse light extension (this corresponds to the group 31, as shown in FIG FIG. 6 is shown). Such a luminaire is preferred if only one street side is to be illuminated, as in FIG. 10 shown. Alternatively, such street lights can also be mounted centrally above the road to illuminate both road halves of the road.

Die Erfindung sieht es insbesondere auch vor, daß die LED-Beleuchtungseinrichtungen auf der Platine variabel positionierbar sind. Dadurch lassen sich insbesondere unterschiedliche Lichtbandknickungen, wie im Zusammenhang mit den Figuren 9 und 10 beschrieben, durch einen Leuchtentyp realisieren.The invention also provides, in particular, that the LED lighting devices can be variably positioned on the board. This makes it possible in particular different Lichtbandknickungen, as in connection with the FIGS. 9 and 10 described, realized by a luminaire type.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

11
LEDLED
22
Vertiefungdeepening
33
LichtlenkkörperLight-guiding body
44
Zentrierhilfecentering
55
LichteintrittsflächeLight entry surface
66
LichteintrittsflächeLight entry surface
77
LichteintrittsflächeLight entry surface
88th
Strahlenbündelray beam
99
Strahlenbündelray beam
1010
Strahlenbündelray beam
1111
Grenzflächeinterface
1212
LichtaustrittsflächeLight-emitting surface
1313
Hauptmaximummain maximum
13'13 '
kombiniertes Hauptmaximumcombined main maximum
1414
LichtaustrittsflächeLight-emitting surface
1515
Grenzflächeinterface
1616
Grenzflächeinterface
1717
Grenzflächeinterface
1818
LichtaustrittsflächeLight-emitting surface
1919
Nebenmaximumsecondary maximum
19'19 '
kombiniertes Nebenmaximumcombined secondary maximum
2020
Zapfenspigot
2121
Straßenleuchtestreet lamp
2222
Mastmast
2323
Platinecircuit board
31a,b31a, b
Gruppe von LED-BeleuchtungseinrichtungenGroup of LED lighting devices
32a,b32a, b
Gruppe von LED-BeleuchtungseinrichtungenGroup of LED lighting devices
33a,b33a, b
Gruppe von LED-BeleuchtungseinrichtungenGroup of LED lighting devices

Claims (15)

LED-Beleuchtungseinrichtung, die wenigstens eine LED (1) mit einer Hauptabstrahlrichtung in der Lichtabgabe der LED und einen Lichtlenkkörper (3) umfaßt, der aus einem Lichtleiter gebildet ist und wenigstens eine Lichtaustrittsfläche (12, 14, 18) aufweist,
wobei Licht der LED (1) in den Lichtlenkkörper (3) eingekoppelt wird und der Lichtlenkkörper (3) wenigstens einen Teil des Lichts so umlenkt, daß es den Lichtlenkkörper (3) durch die Lichtaustrittsfläche (12, 14, 18) mit einer Lichtverteilung verläßt, die asymmetrisch bezüglich der Hauptabstrahlrichtung der LED ist,
dadurch gekennzeichnet, daß die Lichtverteilung in einer Schnittebene, in welcher die Hauptabstrahlrichtung der LED liegt und welche die Lichtaustrittsfläche (12, 14, 18) schneidet, eine Lichtverteilungskurve definiert, die ein Hauptmaximum (13) und wenigstens ein Nebenmaximum aufweist, wobei das Hauptmaximum (13) asymmetrisch bezüglich der Hauptabstrahlrichtung der LED liegt.
LED lighting device comprising at least one LED (1) with a main emission direction in the light output of the LED and a light-guiding body (3) which is formed from a light guide and has at least one light exit surface (12, 14, 18),
wherein light of the LED (1) is coupled into the light-guiding body (3) and the light-guiding body (3) deflects at least part of the light so that it leaves the light-guiding body (3) through the light-emitting surface (12, 14, 18) with a light distribution that is asymmetrical with respect to the main emission direction of the LED,
characterized in that the light distribution in a sectional plane in which the main emission direction of the LED intersects and which intersects the light exit surface (12, 14, 18) defines a light distribution curve having a main maximum (13) and at least a secondary maximum, the main maximum ( 13) is asymmetrical with respect to the main emission direction of the LED.
LED-Beleuchtungseinrichtung nach Anspruch 1, wobei das Hauptmaximum (13) in der Schnittebene gegenüber der LED-Hauptabstrahlrichtung in einem Winkelbereich zwischen 45° bis 80°, bevorzugt zwischen 55° und 75°, liegt, und/oder das Nebenmaximum (19) in der Schnittebene gegenüber der LED-Hauptabstrahlrichtung in einem Winkelbereich zwischen -30° und 30°, bevorzugt zwischen -20° und 20°, liegt.LED lighting device according to claim 1, wherein the main maximum (13) in the sectional plane with respect to the main LED emission direction in an angle range between 45 ° to 80 °, preferably between 55 ° and 75 °, and / or the secondary maximum (19) in the cutting plane with respect to the main LED emission direction in an angle range between -30 ° and 30 °, preferably between -20 ° and 20 °. LED-Beleuchtungseinrichtung nach einem der vorhergehenden Ansprüche, wobei der Anteil des Lichts, der den Lichtlenkkörper (3) in Richtung des Hauptmaximums (13) verläßt, und der Anteil des Lichts, der den Lichtlenkkörper in Richtung des Nebenmaximums (19) verläßt, durch unterschiedliche Lichtaustrittsflächen (12, 14, 18) des Lichtlenkkörpers (3) hindurchtreten.LED lighting device according to one of the preceding claims, wherein the proportion of light leaving the light-guiding body (3) in the direction of the main maximum (13), and the proportion of light leaving the light-guiding body in the direction of the secondary maximum (19) by different Light exit surfaces (12, 14, 18) of the light guide body (3) pass. LED-Beleuchtungseinrichtung nach einem der vorhergehenden Ansprüche, wobei der Anteil des Lichts, welcher den Lichtlenkkörper (3) in Richtung des Hauptmaximums verläßt, den Lichtlenkkörper durch wenigstens zwei unterschiedliche Lichtaustrittsflächen (12, 14) des Lichtlenkkörpers (3) verläßt.LED lighting device according to one of the preceding claims, wherein the proportion of the light which the light-guiding body (3) in the direction of the main maximum leaves, the light-guiding body through at least two different light exit surfaces (12, 14) of the light-guiding body (3) leaves. LED-Beleuchtungseinrichtung nach einem der vorhergehenden Ansprüche, wobei der Lichtlenkkörper ein oder mehrere Flächen (11, 15, 16) aufweist, die gegenüber der LED so angeordnet sind, daß Licht der LED daran total reflektiert wird.An LED lighting device according to any one of the preceding claims, wherein the light-guiding body has one or more surfaces (11, 15, 16) arranged opposite the LED so as to totally reflect light of the LED thereon. LED-Beleuchtungseinrichtung nach einem der vorhergehenden Ansprüche, wobei das Licht der LED durch eine oder mehrere Lichteintrittsflächen (5, 6, 7) in den Lichtlenkkörper (3) eingekoppelt wird.LED lighting device according to one of the preceding claims, wherein the light of the LED by one or more light entry surfaces (5, 6, 7) is coupled into the light-guiding body (3). LED-Beleuchtungseinrichtung nach Anspruch 6, wobei die eine oder mehreren Lichteintrittsflächen rotationssymmetrisch um die LED-Hauptabstrahlrichtung oder wenigstens abschnittsweise parallel zu wenigstens einer Lichtaustrittsfläche (12, 14, 18) angeordnet ist bzw. sind.LED lighting device according to claim 6, wherein the one or more light entry surfaces rotationally symmetrical about the main LED emission direction or at least partially parallel to at least one light exit surface (12, 14, 18) is or are arranged. LED-Beleuchtungseinrichtung nach Anspruch 6 oder 7, wobei das Licht der LED beim Einkoppeln durch mehrere Lichteintrittsflächen (5; 6; 7) in wenigstens zwei, bevorzugt drei Lichtbündel aufgeteilt wird, wobei insbesondere eines oder mehrere der Lichtbündel (8, 9) durch den Lichtlenkkörper in Richtung des Hauptmaximums (13) gelenkt werden und eines oder mehrere der anderen Lichtbündel (10) in Richtung des Nebenmaximums (19) gelenkt werden.LED lighting device according to claim 6 or 7, wherein the light of the LED during coupling through a plurality of light entry surfaces (5; 6; 7) is divided into at least two, preferably three light bundles, wherein in particular one or more of the light bundles (8, 9) through the Lichtlenkkörper be directed in the direction of the main maximum (13) and one or more of the other light bundles (10) in the direction of the secondary maximum (19) are directed. LED-Beleuchtungseinrichtung nach einem der vorhergehenden Ansprüche, wobei die wenigstens eine Lichtaustrittsfläche (12, 14, 18) sich in der Richtung senkrecht zur besagten Schnittebene gradlinig erstreckt.LED lighting device according to one of the preceding claims, wherein the at least one light exit surface (12, 14, 18) extends in a straight line in the direction perpendicular to said cutting plane. LED-Beleuchtungseinrichtung nach einem der vorhergehenden Ansprüche, wobei mehrere LEDs vorgesehen sind, die insbesondere in einer Reihe, insbesondere senkrecht zu besagter Schnittebene, angeordnet sind.LED lighting device according to one of the preceding claims, wherein a plurality of LEDs are provided, which are arranged in particular in a row, in particular perpendicular to said cutting plane. LED-Beleuchtungseinrichtung nach einem der vorhergehenden Ansprüche, wobei der Lichtlenkkörper nicht-parallele Seiten aufweist, an denen Lichtaustrittsflächen angeordnet sind.LED lighting device according to one of the preceding claims, wherein the light-guiding body has non-parallel sides, on which light exit surfaces are arranged. Leuchte mit einer Platine (23), auf der mehrere LED-Beleuchtungseinrichtungen, insbesondere nach einem der vorhergehenden Ansprüche, installiert sind, wobei jede der LED-Beleuchtungseinrichtungen wenigstens eine LED (1) mit einer bezüglich einer Hauptabstrahlrichtung der LED rotationssymmetrischen Lichtabgabe und jeweils einem Lichtlenkkörper (3) umfaßt, der aus einem Lichtleiter gebildet ist und wenigstens eine Lichtaustrittsfläche (12, 14, 18) aufweist, wobei Licht der LED (1) in den Lichtlenkkörper (3) eingekoppelt wird und der Lichtlenkkörper (3) wenigstens einen Teil des Lichts so umlenkt, daß es den Lichtlenkkörper (3) durch eine Lichtaustrittsfläche (12, 14, 18) mit einer Lichtverteilung verläßt, die asymmetrisch bezüglich der Hauptabstrahlrichtung der LED ist, wobei die Lichtverteilung in einer Schnittebene, in welcher die Hauptabstrahlrichtung der LED liegt und welche die Lichtaustrittsfläche (12, 14, 18) schneidet, eine Lichtverteilungskurve definiert, die ein Hauptmaximum (13) aufweist, das asymmetrisch bezüglich der Hauptabstrahlrichtung der LED liegt.Luminaire with a circuit board (23) on which a plurality of LED lighting devices, in particular according to one of the preceding claims, are installed, wherein each of the LED lighting devices at least one LED (1) with respect to a main emission of the LED rotationally symmetrical light output and each a light guide body (3), which is formed from a light guide and at least one light exit surface (12, 14, 18), wherein light of the LED (1) is coupled into the light-guiding body (3) and the light-guiding body (3) at least a part of the light deflects so that it leaves the light-guiding body (3) through a light exit surface (12, 14, 18) with a light distribution which is asymmetrical with respect to the main emission direction of the LED, the light distribution being in a sectional plane in which the main emission direction of the LED is and which the light exit surface (12, 14, 18) intersects, defining a light distribution curve which is a H Main maximum (13), which is asymmetrical with respect to the main emission of the LED. Leuchte nach Anspruch 12, wobei die mehreren LED-Beleuchtungseinrichtungen zwei oder mehr Gruppen (3 1 a, 31b, 32a, 32b, 33a, 33b) von LED-Beleuchtungseinrichtungen umfassen, deren Hauptmaxima jeweils die gleiche räumliche Orientierung bezüglich ihrer jeweiligen LED-Hauptabstrahlrichtung besitzen, wobei insbesondere die räumliche Orientierung von zwei der Gruppen (31 a, 31 b; 32a, 32b; 33a, 33b) von LED-Beleuchtungseinrichtungen spiegelsymmetrisch bezüglich einer Ebene ist, welche die Platine (23) der Leuchte senkrecht schneidet.Luminaire according to claim 12, wherein the plurality of LED lighting devices comprise two or more groups (3 1 a, 31 b, 32 a, 32 b, 33 a, 33 b) of LED lighting devices whose main maxima each have the same spatial orientation with respect to their respective LED main emission direction In particular, the spatial orientation of two of the groups (31 a, 31 b, 32 a, 32 b, 33 a, 33 b) of LED lighting devices is mirror-symmetrical with respect to a plane which perpendicularly intersects the board (23) of the lamp. Leuchte nach Anspruch 13, die eine erste und eine zweite Gruppe (31 a, 31 b) von LED-Beleuchtungseinrichtungen aufweist, deren Hauptmaxima jeweils einen Azimutalwinkel bezüglich ihrer jeweiligen LED-Hauptabstrahlrichtung aufweisen, so daß die Hauptmaxima der beiden Gruppen bezüglich der azimutalen Winkelausrichtung entgegengesetzt zueinander orientiert sind.A luminaire according to claim 13, comprising a first and a second group (31a, 31b) of LED illuminators whose major maxima each have an azimuthal angle with respect to their respective LED main emission direction so that the principal maxima of the two groups are opposite in azimuthal angular orientation oriented to each other. Leuchte nach Anspruch 14, die weiter eine dritte und eine vierte Gruppe (32a, 32b) von LED-Beleuchtungseinrichtungen aufweisen, wobei die Hauptmaxima der dritten Gruppe (32a) einen einheitlichen Azimutalwinkel bezüglich der LED-Hauptabstrahlrichtung zwischen 5° und 30° gegenüber den Hauptmaxima der ersten Gruppe einnehmen und die vierte Gruppe (32b) einen einheitlichen Azimutalwinkel bezüglich der LED-Hauptabstrahlrichtung zwischen -5° und -30° gegenüber der zweiten Gruppe einnehmen.Luminaire according to claim 14, further comprising a third and a fourth group (32a, 32b) of LED lighting devices, wherein the main maxima of the third group (32a) has a uniform azimuthal angle with respect to the LED main emission direction between 5 ° and 30 ° with respect to the main maxima occupy the first group and the fourth group (32b) occupy a uniform azimuthal angle with respect to the main LED emission direction between -5 ° and -30 ° with respect to the second group.
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