EP3073179B1 - Led module with vaned reflector and luminaire with corresponding led module - Google Patents

Description

The present invention relates to a luminaire with LED module. The LED module is designed to be mounted in a luminaire housing. The LED module features Light Emitting Diodes, LEDs, which also include Organic Light Emitting Diodes, OLEDs, as a light source and a reflector. The LEDs may also be referred to as a chip-on-board, i. a plurality of semiconductor light sources on a circuit board, be executed.

Modules for luminaires are known in the prior art, which have LEDs with reflectors and which are intended to be used in a luminaire. The light control within the modules is determined by the arrangement of the LEDs with respect to the reflector and the reflector shape. As a rule, the LEDs are placed approximately perpendicular to a reflector surface with respect to the light exit surface, so that the light emitted laterally from the LEDs to the rear of the reflector is deflected in the direction of the light exit surface.

For example, is from the WO 2006/033042 A1 an LED Kollimatorelement known which is designed specifically for asymmetric light output. As usual in the prior art, the LED is arranged with the optical axis in the direction of the main emission of the lamp module.

This concept is widely used in conventional lights. However, this arrangement may be particularly disadvantageous for luminaires intended to produce a wide distribution of light.

The WO 00/71930 A1 discloses a linear array of LED light sources of different colors arranged along a reflector so that light from the LED light sources is at least partially reflected. Similar modules with a reflector and LEDs are in the WO 2011/149795 A1 . DE 10 2004 044 358 A1 and the EP 2 202 447 A1 disclosed. The EP 1 094 271 A2 discloses a small light source module with a single LED and a side-mounted flat reflector.

The EP 1 953 449 A2 discloses a luminaire having at least two LED modules each comprising an LED and a reflector disposed laterally thereon. Other lights with one or more LEDs as a light source and laterally arranged reflectors are in the FR 2 956 469 , the US 2012/051062 A1 and the WO 11/069305 A1 described.

The object of the present invention is to provide a luminaire with one or more LED modules, which is suitable in an efficient way for the light deflection of the light of the LEDs to produce a broad light distribution. In particular, e.g. a street with street lights are illuminated evenly, the mast spacing can be chosen as large as possible. Furthermore, it is also desirable for floodlights or so-called wallwashers, which illuminate facades or interior walls surface, to provide a luminaire, which enables the lighting task efficiently. The problem is solved by a luminaire according to claim 1.

A special feature of the LED modules is that the optical axes of the LEDs are arranged parallel or at a shallow angle with respect to the reflector surface and with respect to the light exit surface. As a result, the natural radiation characteristic of the LED, which corresponds to a punctiform light source, can be optimally utilized to produce a wide-beam light distribution. The light that exits into a half-space in the direction of the light exit surface need not be distracted at all. The light emitted to the reflector in the opposite half space is deflected at a shallow angle at the reflector surface. The flat reflection angle produces a broad light distribution of the module.

According to a preferred embodiment, the reflector has a concave curvature with respect to the light exit surface and the curvature defines a height which does not exceed 30% or 20% of a longitudinal extension of the reflector. Due to the concave curvature, a part of the reflected light is bundled and deflected to illuminate a light closer area. In particular, a partial area of the reflector which is closer to the LEDs may have a weaker curvature than a lying subarea of the reflector which is remote from the LEDs. As a result, the light distribution of the light generated by the LED is limited in the region of high deflection angle with respect to the normal to the light exit surface. Thus, a glare can be limited, for example, for moving towards the lamp vehicles.

According to a preferred embodiment, the reflector has facets. In particular, strip-shaped facets can be provided parallel to the side wall carrying the LEDs. By faceting creates the impression that the light of several different Subareas of the lamp module goes out. This reduces glare when viewed directly in the light. The facets can be flat, concave or convex curved.

According to a preferred embodiment, the side wall, which carries the LEDs, at an angle between 70 ° and 110 °, in particular with 90 °, to the adjacent portion of the reflector and / or arranged to the light exit surface. In this embodiment, the LEDs can be mounted with their optical axis perpendicular to the side wall to comply with the condition that the optical axis at an angle of less than ± 20 ° relative to the reflector surface and the light exit surface.

According to a preferred embodiment, the side wall is thermally connected on the side facing away from the reflector with a heat sink. The heat sink may have cooling fins. It is also possible that the heat sink forwards the heat of the LEDs to an adjacent component. In particular, the luminaire module can adjoin a cooling body to a housing wall of a surrounding housing, so that the heat is conducted from the LEDs via the heat sink to the housing wall to dissipate the heat by convection. The heat sink can also be a housing wall directly. The side wall carrying the LEDs can be designed as a circuit board. The side facing the LEDs can be made reflective. The board can be designed for better thermal conduction as metal core boards.

According to a preferred embodiment, a Abblendstreifen is arranged between the side wall and the light exit surface, which covers the LEDs from a direction perpendicular to the light exit surface. The dimming strip can also be mirrored on the side facing the LED as well as the reflector. The dimming strip protects against glare with direct view of the LED module.

According to a preferred embodiment, the reflector widens along a direction away from the LEDs. This reflector shape is more efficient than with parallel longitudinal side edges because there is less reflection.

According to a preferred embodiment, the reflector surface has reflecting side longitudinal walls, which are arranged on the longitudinal edges of the reflector next to the side wall carrying the LED. These side walls, which are preferably mirrored on the inside, limit the light distribution in a plane perpendicular to the light exit surface of the LED module.

The special shape of the reflector, which is flat, optionally has a weak concave curvature and is provided in particular with side walls, can also be referred to as "blade-shaped".

According to two different embodiments, the LEDs in the array are arranged symmetrically or asymmetrically with respect to a median plane perpendicular to the reflector. The symmetrical arrangement also provides symmetrical light distribution with respect to the midplane. This embodiment is preferred, for example, for street lights, which have two such LED modules and deliver the light distributed from a location centrally above the road along a longitudinal section of the road. However, according to an alternative embodiment, the LEDs in the array are arranged asymmetrically with respect to the center plane perpendicular to the reflector. This embodiment is suitable e.g. for generating a Lichtbandknickung, which is desirable when the LED modules are provided in a street lamp, which is arranged laterally on the roadside. As is known to those skilled in the field of street lighting, the light distribution with a light band buckling serves to illuminate a road as evenly as possible from a position laterally of the road.

The invention relates to a luminaire, which may be designed in particular as a street lamp, wall washer or floodlights. The luminaire has a housing in which at least one LED module, as described above, is arranged. It can also be provided several, in particular two LED modules. Two LED modules are suitable, for example, for a street lamp, which should illuminate the largest possible longitudinal section of a street. A luminaire with a single LED module of the embodiments described above is suitable, for example, as a wallwasher or floodlight. In the case of the wall washer, the LED module in the luminaire with the side wall carrying the LEDs is preferably arranged perpendicular to the wall or facade, which should be illuminated as uniformly as possible. In a floodlight, the LED module may also be positioned in a plane opposite the level to be illuminated in order to illuminate an area remote from the luminaire. According to a preferred embodiment, the luminaire has at least two LED modules, wherein the side walls of the two modules carrying the LED are arranged opposite to one another. As a result, a symmetrical light distribution with respect to a center plane of the luminaire can be generated parallel to the two side walls. This configuration is particularly suitable for a street lamp, which is intended to illuminate a longitudinal section of a street.

According to one embodiment of the aforementioned embodiment, the two oppositely arranged modules in the luminaire are arranged so that light bundles of the emitted light radiation at least partially cross over. Thereby, the side walls of the two modules can be arranged spaced apart in the housing, whereby a better thermal distribution can be achieved within the lamp. Alternatively, the side walls of the two modules and the center of the lamp adjacent to each other. In this embodiment of the luminaire, the light bundles of the LED modules do not intersect, which allows a more pleasing visual impression, however, suitable means, in particular heat sinks, are provided in order to be able to effectively dissipate the heat in the region between the rear side walls adjoining one another.

According to a preferred embodiment of a luminaire, the side wall of the one or the side walls of the plurality of LED modules is thermally connected to the outer wall of the housing. As a result, the outer wall of the housing itself act as a heat sink. Preferably, all arranged in the lamp LED modules with its side wall in thermal contact with the outer wall of the lamp housing. The outer wall of the housing may in particular have cooling ribs which run perpendicular to the light exit opening. This has the advantage that in a horizontally arranged light the cooling fins by air convection are particularly effective.

According to a development of the aforementioned embodiment, the one or more side walls of the LED module (s) adjoin / adjoin an outer wall of the housing from the inside. As a result, the thermal contact with the outer wall can be easily achieved. Alternatively, a thermally conductive element, for example, a heat sink, between the side wall and the housing outer wall may be arranged to transfer the heat.

According to the invention, the luminaire defines a light exit surface and the light exit surface (s) of the at least one LED module or preferably all LED modules contained in the luminaire is / are set at an angle to the light exit surface of the luminaire, which is larger or smaller than
0 ° and does not exceed ∓ 20 °.

Figur 1

zeigt eine perspektivische Ansicht eines LED-Moduls.

Figur 2

zeigt einen Längsquerschnitt durch das LED-Modul nach Figur 1.

Figuren 3 bis 9

zeigen Aufsichten auf Lichtaustrittsflächen unterschiedlicher Leuchten mit einem oder mehreren LED-Modulen gemäß Figur 1.

The light exit surface of the luminaire can also coincide with the light exit surface or surfaces of the LED modules. In this case, the superposition of the light distributions generated by the LED modules forms the light distribution which is realized overall by the luminaire. However, it can be provided that the two or more LED modules in the lamp with their respective light exit surfaces are not arranged parallel to each other, but are employed at an angle of, for example, a maximum of 40 ° to each other. As a result, the width of the light distribution of the lamp depending on the angle of attack can be reduced or extended. Further, it is also possible to arrange the two LED lamp modules horizontally with each other at an angle of more or less than 180 ° to produce an asymmetric light distribution. For example, in this way with two symmetrically radiating LED modules (ie with symmetrically arranged LED arrays) in the luminaire together produce a light distribution with a light band buckling. Further features and advantages of the invention will become apparent from the following detailed description of preferred embodiments given in conjunction with the accompanying drawings. The figures show the following:

FIG. 1

shows a perspective view of an LED module.

FIG. 2

shows a longitudinal cross section through the LED module FIG. 1 ,

FIGS. 3 to 9

show views of light exit surfaces of different lights with one or more LED modules according to FIG. 1 ,

Referring to FIGS. 1 and 2 An embodiment of an LED module will be described. The LED module has a flat, slightly concave curved reflector surface 2 which extends in a longitudinal direction of the module and increases in width from one side wall 4 of the module to the opposite side in width. The reflector surface is arranged opposite a light exit surface of the module, wherein in the illustrated embodiment, the light exit surface has no cover. In an alternative embodiment, however, a transparent or partially printed cover may also be provided.

The side wall 4 of the LED module is in cross section, as in FIG. 2 represented, arranged approximately perpendicular to the adjacent to the side wall part of the reflector surface 2. On the inside of the side wall 4 are a plurality of LEDs 6 in a row perpendicular to the image planes of FIG. 2 arranged. This array of LEDs 6 preferably has at least four or eight LEDs, wherein the arrangement in several rows is possible. The optical axis of the LEDs 6, which corresponds to the main emission direction of the LED, runs perpendicular to the side wall 4, ie approximately parallel to a part of the reflector surface 2 and the light exit surface, which is formed by the opening opposite the reflector surface 2. On the two longitudinal sides of the reflector surface 2 each side edges 8 are provided, which are mirrored on the inwardly facing side as well as the reflector surface 2.

On the side wall 4, a Abblendstreifen 10 is provided on the opposite side of the reflector surface 2, which prevents the direct view of the LEDs 6 from a direction approximately perpendicular to the light exit surface of the LED module. Accordingly, in the perspective view after FIG. 1 , which shows the LED module approximately from the direction of the light exit surface, the LEDs 6 hidden. The Abblendstreifen 10 may also be mirrored on the side facing the LEDs 6 side.

The light emitted by the LEDs 6, which is emitted in the half space opposite the reflector surface 2, can leave the LED module unhindered by the light exit surface, except for a small part of the light, which is reflected by the Abblendstreifen 10. That in the opposite half space, i. emitted in the direction of the reflection surface 2 light beam of the LEDs 6 is reflected by the reflection surface 2 at a relatively shallow angle and leaves the light through the light exit surface predominantly in a direction which follows the longitudinal extent of the module.

The reflector surface 2 has a plurality of facets 12, which is formed in the form of longitudinal strips transversely to the longitudinal extent of the LED module. The facets have the effect that the almost punk-shaped LED light sources are perceived as light reflections in every single facet. This decomposition of the light reduces the glare when viewing the reflector.

The side wall 4 can be thermally connected on the side facing away from the LEDs with a heat sink to dissipate the heat generated during operation of the LED. The heat sink may be formed in particular by a part of a lamp housing, as will be explained below in connection with various embodiments of a lamp having one or more of the modules described above.

Referring to the FIGS. 3 to 9 various embodiments of lamps are shown, in which one, two or four of the previously described LED modules are used. In each case, the plan view of the luminaire on the light exit surface is shown schematically.

The various embodiments of the luminaires each have a housing which has a circumferential outer wall 20. As in the FIGS. 8 and 9 is shown, may be provided on the outer wall 20 at least over subregions cooling fins, so that the housing edge itself can act as a heat sink. However, a smooth outer wall can serve as a heat sink. The housing is preferably formed of aluminum to allow good heat conduction.

In the embodiment according to FIG. 3 two of the LED modules are provided side by side in parallel, wherein the side wall 4 is adjacent to the outer wall 20 from inside. Furthermore, a ballast 22 and a receptacle for a lamp post 24 is shown in the top view of the lamp housing. The light can be mounted, for example, with the receptacle 24 on a light pole, so that in the FIGS. 3 to 9 shown light exit surface of the lamp down, for example, to a street to be illuminated points.

At the in FIG. 3 illustrated embodiment, both LED modules in the same direction, so that an overall asymmetric light distribution is generated with an extension in the image plane to the left.

In the FIG. 4 shown lamp has only one LED module, which emits light preferably in the image planes down. These lights in the FIGS. 3 and 4 could for example be formed with the light exit surface parallel to a wall as a wallwasher.

The in the FIGS. 5 to 9 shown lights each have two or four LED modules, which are arranged opposite to each other. These lights therefore produce a symmetrical light distribution, which extend in each case in the directions right and left in the image plane.

In all embodiments of the lights except in the FIGS. 4 and 7 the LED modules are arranged so that the side wall 4 on the outside wall 20 of the lamp module is adjacent to the inside or at least connected via a short thermal bridge in order to dissipate the heat generated during operation of the LEDs on the lamp housing can.

In the embodiments according to Figures 5 and 8th Although the LED modules are arranged opposite to each other, but not arranged symmetrically at the same height. The light output on both longitudinal sides of the lamp is therefore not exactly symmetrical to each other. However, this effect is not apparent in the overall light distribution of the luminaire. The luminaire therefore has a total of a symmetrical light output, which is suitable for example for illuminating a road in the longitudinal direction. By arranging the LED modules side by side, the lamp housing can be made narrower overall, compared to the embodiments according to FIGS. 6, 7 and 9 where each two LED modules are arranged on an axis opposite to each other.

According to the embodiments Figures 5 and 9 the LED modules are directed towards each other, so that the light beams of two LED modules cross each other. This embodiment also serves to form a longitudinally extending light distribution transversely to the image plane of the luminaires shown. In particular, for street lights, this embodiment is preferred.

The FIG. 7 shows an alternative in which the two LED modules are arranged so that the LEDs are in the center of the lamp. The resulting light distribution is similar to that in FIG. 6 illustrated light, but the light beams of the two LED modules do not cross. The light after FIG. 7 Therefore, preferably has a separate heat sink (not shown in the figure) which is arranged in the middle between opposing side walls 4 to dissipate the heat of the LEDs can.

Numerous modifications of the previously described LED lighting modules and luminaires are possible within the scope of the invention. In particular, configurations are considered according to the invention, in which the LED modules are not parallel to each other in the Luminaire are arranged. For example, two LED modules can be arranged at an angle of less than 20 ° to each other. With such a luminaire, a light band buckling can be achieved because the main direction of the light distribution of the two LED modules is not on a common axis. Alternatively, however, it can also be provided that the LED array is arranged asymmetrically within the LED modules on the side wall 4, so that the LED module itself generates a light distribution which is not symmetrical to the longitudinal direction of the module. Then a Lichtbandknickung can be achieved by a lamp, which only, as in the FIGS. 5 to 9 shown, having mutually parallel LED modules.

According to further embodiments can also be provided that the light exit surface of the LED modules are employed within the lamp at an angle to the light exit surface of the lamp. As a result, the width of the light distribution along the longitudinal axis of the modules can be reduced or expanded. Alternatively, the convex curvature of the reflector surface 2 can be increased in order to focus the light more.

LIST OF REFERENCE NUMBERS

2

reflector

4

Side wall

6

LED

8th

Longitudinal side walls

10

Abblendstreifen

12

facet

20

Exterior wall of the luminaire housing

21

cooling fins

22

ballast

24

Pole light absorption

Claims (13)

1. Luminaire, in particular street luminaire, wallwasher or floodlight, which has a housing in which at least one or two LED modules are arranged, the LED module or modules each having a flat reflector (2) opposite a light-emitting surface of the LED module, and an array of LEDs (6) arranged on a side wall (4) of the reflector surface (2), the LEDs (6) defining optical axes corresponding to the main beam direction of the respective LED, the optical axes lying in one or more planes which are flat, that is at an angle of less than ±20° to the part of the reflector (2) adjoining the side wall (4) and the light exit surface,
   wherein at least one LED module contained in the luminaire is set at an angle to the light exit surface of the luminaire which is greater than or less than 0° and does not exceed ±20°.
2. Luminaire according to claim 1, wherein the flat reflector (2) is concavely curved with respect to the light exit surface and the curvature defines a height not exceeding more than 30% of a longitudinal extent of the reflector (2).
3. Luminaire according to one of the preceding claims, the reflector (2) comprising facets (12), in particular strip-shaped facets (12) with a longitudinal extension parallel to the side wall (4).
4. Luminaire according to one of the preceding claims, wherein the side wall (4) is arranged at an angle between 70° and 110° to a partial section of the reflector (2) and/or the light exit surface adjacent to the side wall.
5. Luminaire to one of the preceding claims, the side wall (4) being thermally connected to a heat sink on a side facing away from the reflector (2).
6. Luminaire according to one of the preceding claims, a dimming strip (10) being arranged between the side wall (4) and the light-emitting surface and covering the LEDs (6) from a direction perpendicular to the light-emitting surface.
7. Luminaire according to one of the preceding claims, the reflector (2) widening along a direction away from the LEDs (6).
8. Luminaire according to one of the preceding claims, wherein the reflector (2) has reflecting longitudinal side walls (5) which are arranged at longitudinal edges of the reflector (2) next to the side wall (4) carrying the LEDs (6).
9. Luminaire according to one of the preceding claims, the LEDs (6) in the array being arranged symmetrically or asymmetrically with respect to a median plane perpendicular to the reflector (2).
10. Luminaire according to claim 9 having two LED modules whose side walls (4) are arranged opposite one another.
11. Luminaire according to Claim 10, in which light bundles of the light radiation emitted by the two oppositely arranged modules cross over one another.
12. Luminaire according to one of the preceding claims, wherein the at least one or the two LED modules are thermally connected with their respective side walls (4) to an outer wall (20) of the housing.
13. Luminaire according to claim 12, the at least one or the two side walls (4) of the LED module(s) adjoining an outer wall (20) of the housing from the inside.

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