EP2553317B1 - Light having led modules - Google Patents

Description

The invention relates to lights, in particular street or path lights for outdoor use, which have a plurality of LED modules.

The advances in the technical development of LEDs as light sources, in particular the development of particularly powerful LEDs, has made it possible to use such light sources as bulbs for outdoor lights, especially street lights. In this case, a plurality of LEDs is provided, which must be arranged to achieve a desired light distribution in the luminaire and optionally provided with reflectors.

A street lamp, which comprises LEDs as light sources, is from the document WO 2006/060905 A1 known. The LEDs are arranged in several sub-levels, which can be adjusted against each other in order to produce different light distributions can.

However, the possibilities for generating desired light distributions with the structures known from the prior art are very limited. Other developments provide very complex reflector structures on the LED modules to produce desired light distributions.

The DE 10 2008 007 723 A1 discloses a lighting module and a luminaire having a plurality of such lighting modules. Each lighting module has one or more LEDs across which extends a common lens which produces an expanded light distribution. The expanded light is reflected at a reflector having multiple facets. The reflector is preferably located in a beam path of a light intensity maximum.

The object of the present invention is to provide a modular LED luminaire, in particular for outdoor use, which enables the generation of light distributions, which are particularly suitable for street and path lights, with simply designed LED modules.

The object is achieved by a lamp, in particular outdoor lamp, with a light source carrier surface on which a plurality of LED modules are arranged, wherein the LED modules in each case a matrix of a plurality of LEDs ("light emitting diodes", which are also to be understood as "organic light-emitting diodes" (OLEDs)), which are arranged in a plane and have a reflector strip which adjoins an edge of the plane and opposite to the Level is angled, wherein the LEDs each have an integrated optics, which generates in a cross section through the LED perpendicular to the plane two maxima of the light intensity distribution of the respective individual LED, which are laterally deflected relative to the surface normal on the plane by the LED, wherein the Light radiation of the LED is reflected in one of the two maxima of the reflector strip.

The luminaire according to the invention comprises a luminous means carrier surface, on which LED modules with a comparatively simple construction can be arranged. The LEDs on the modules have an integrated optic which generates two maxima in the light intensity distribution in a vertical cross section through the LED. Such LEDs with optics are also known as "side-emitting LED". However, these LEDs have the disadvantage for the applications in street lamps, that they each produce a completely symmetrical light distributions, so that the combination of several such LEDs are not to form asymmetric light distribution curves, as they are needed to illuminate roads or roads , There are also side-emitting LEDs with a somewhat oval light distribution known, i. the two maxima of the light distribution are formed differently strongly in two cross sections (along a major diameter and a minor diameter of the oval). However, this asymmetry is not sufficient to produce any desired overall light distribution of the lamp by arranging the LEDs. The solution according to the invention provides modules which have a reflector strip arranged laterally to an LED matrix in a plane, which asymmetrically transforms the emission characteristic of the individual modules. Due to the asymmetrically radiating LED modules and the possibility of freely arranging the LED modules on a light source carrier surface within the luminaire, a large variation of suitable total light distributions can be produced. Particularly noteworthy is that the LED modules have a simple design. Complicated reflector structures are not necessary in the invention.

According to a preferred embodiment, the integrated optics provide for a deflection of the maxima of the luminous intensity distribution curve of the individual LED in the cross section perpendicular through the LED relative to the surface normal on the plane through the LED by at least 10 °, preferably at least 20 ° or 30 °. This lateral deflection relative to the surface normal in conjunction with the laterally arranged reflector strip already sufficient to provide an LED module, which has a significant asymmetry in the light emission, so that by the arrangement of the LED modules a desired (asymmetric) overall light distribution of the lamp can be achieved.

According to a preferred embodiment, the individual LEDs with integrated optics have an oval or circular emission characteristic relative to the surface normal of the plane through the LEDs. This radiation characteristic can be generated by a relatively simple optics directly to the LED. The oval radiation characteristic also has the advantage that the LEDs with the longer axis of the oval can be arranged transversely to the reflector strip. As a result, a maximum, which has a larger deflection angle to the surface normal through the LEDs on the plane, is directed toward the reflection on the reflector strip, resulting overall in a greater asymmetry of the light distribution of the individual module. To even out the light distribution of one LED module, however, it may also be preferable to arrange the LEDs with an oval light distribution such that the main axis of the oval has an angle of ± 5 ° with respect to the cross-sectional plane perpendicular to the reflector strip. As a result, the light distribution, which is generated by an LED module, something uniform.

According to a preferred embodiment, in the LED modules, the reflector strips with the plane in which the LED matrix is arranged, an angle between 65 ° and 115 °, preferably between 80 ° and 100 °, more preferably about 90 °, a. An approximately rectangular arrangement of the reflector strip to the plane of the LED matrix has the advantage that the light distribution of an LED having in a cross section perpendicular to the plane and perpendicular to the reflector strip two maxima inclined ± γ from the surface normal after reflection on the reflector strip is deflected to one side. If the reflector strip is arranged at 90 ° with respect to the plane of the LED matrix, the maximum of the luminous intensity distribution curve, which points towards the reflector strip, after reflection on the reflector strip in the same direction (only offset in parallel), as the symmetrical Maximum on the opposite side the LED. As a result, both maxima of the light distribution add up and produce a particularly strongly asymmetrical light distribution.

According to a preferred embodiment, the planes of the LED modules form an angle other than 0 ° relative to the illuminant carrier surface, preferably an angle between ± 5 ° and ± 40 °. This tendency can be exploited to align the LED modules, for example, in different rows or columns, different from each other, thereby achieving a desired overall light distribution of the lamp.

According to a preferred embodiment, the LED modules are arranged in parallel within rows on the illuminant carrier surface. Such a row on the illuminant carrier surface generates a maximum of the total luminous intensity distribution of the luminaire in the direction transverse to the longitudinal extent of the row. In particular, two such rows of LED modules can be arranged in mirror symmetry, resulting in a total light intensity distribution having two opposite symmetrical maxima. Such a light distribution is suitable for illuminating a longitudinally extending surface, such as e.g. a section of a path or a section of a road over which the luminaire is arranged.

According to a preferred embodiment, at least some of the LED modules are arranged such that the edges at which the reflector strips adjoin the plane are not aligned parallel to one another. By means of this arrangement of LED modules, it is possible to produce a light distribution characteristic which has a light band bending deviating from 0 °. A light band buckling means that two maxima of the light distribution do not run on a common axis in a horizontal section through the luminaire, but have an angle other than 180 °, e.g. an angle between 140 ° or 170 °, to each other. Such a light distribution is particularly suitable for illuminating a street with a lamp, which is arranged laterally next to the road.

According to a preferred embodiment, the spacing of the LEDs in the planes of the modules is at least 20 mm, preferably between 25 mm and 50 mm. Falling below the distance of less than 20 mm leads to thermal problems, as for outdoor use used high-power LEDs give off a significant amount of heat. For cooling the LEDs, furthermore, the plane of the LED modules can be arranged on a plate of thermally conductive material, for example on an aluminum body. However, if the distance is greater than 50 mm between the LEDs, the luminance that the module can produce decreases. In this case, the modules to achieve a given total light intensity would be too large to be useful in outdoor lighting can be used.

Another aspect of the present invention relates to the single LED module as previously described. These modules can be manufactured and distributed as individual parts to be used as a replacement element for lamps of the aforementioned embodiments.

Figuren 1 bis 4

zeigen verschiedene Ausführungsformen der erfindungsgemäßen Leuchten, wobei Gehäuse und Abdeckelemente zur Vereinfachung weggelassen sind.

Figur 5

zeigt einen Ausschnitt einer Leuchte nach einer der Ausführungsformen nach Figuren 1 bis 4, wobei nur ein LED-Modul dargestellt ist.

Figur 6

zeigt die Lichtstärke gemessen in vier Kegel-Mantel-Kurven einer LED-Matrix eines LED-Moduls ohne Reflektorstreifen.

Figur 7

zeigt eine Lichtstärkeverteilungskurve in drei verschiedenen vertikalen Ebenen durch eine Matrix von LEDs eines LED-Moduls ohne seitlichen Reflektorstreifen.

Further features and advantages of the present invention will be described below with reference to preferred embodiments in conjunction with the attached figures. The figures show the following:

FIGS. 1 to 4

show various embodiments of the lights according to the invention, wherein housing and cover elements are omitted for simplicity.

FIG. 5

shows a section of a lamp according to one of the embodiments according to FIGS. 1 to 4 , where only one LED module is shown.

FIG. 6

shows the light intensity measured in four cone-sheath curves of an LED matrix of an LED module without reflector strips.

FIG. 7

shows a luminous intensity distribution curve in three different vertical planes through a matrix of LEDs of an LED module without side reflector strips.

Referring to the FIGS. 1 to 4 different embodiments of LED outdoor lights are shown, wherein for simplicity, the housing and any existing covers, such as light-diffusing plates or trays, the lights and other mechanical and electrical attachments are not shown. The cover may be a clear or light-scattering cover, which is preferably flat. Furthermore, an antireflection coating may be provided on the cover. The antireflection coating may also be designed to provide light scattering by itself.

The embodiments of the luminaire comprise a luminous means carrier surface 10, which is planar according to the illustrated embodiments. On the support surface 10, a number of LED modules 20 is arranged.

To explain the shape and function of an LED module 20 is on the FIG. 5 Referenced. The LED module 20 has a plane 24, which is formed for example of a continuous board. Preferably, below the board (not shown in the figures) a metal plate is arranged, preferably of aluminum, to serve as a stable support and to provide heat dissipation.

At level 24, a matrix of LEDs 22 is arranged. In the figures, the LEDs are arranged in a rectangular matrix. However, a matrix is also understood to mean another regular arrangement of LEDs. In particular, the LEDs can be arranged in different rows or columns of the matrix offset from one another.

Furthermore, the LED module has a lateral reflector strip 26 which connects at right angles to an edge of the plane 24. The reflector strip 26 is formed on the side facing the LEDs high gloss reflective or matt reflective. On the opposite edge of the plane 24, a fastening strip 27 is arranged, which has an angle α with respect to the plane 24, preferably between 5 ° and 40 °. The fastening strip 27 is fastened flat on the illuminant carrier surface 10, so that the plane 24 is inclined relative to the illuminant carrier surface 10 by the angle α.

Each LED 22 has an integrated optics (not visible in the figures), which ensures that each LED in a cross section perpendicular to the plane 24 has at least two maxima in the light distribution, with respect to the surface normal 28 through the LED and on the Level 24 are inclined. To clarify this issue is on the FIGS. 6 and 7 Reference is made, which shows measurements of light levels of the LED modules without reflector strips 26. FIG. 7 shows in polar representation the light intensity distribution of the LED matrix in three different vertical cutting planes through the LED matrix. It can be seen that two symmetrical maxima are formed in each of the three sectional planes. The strongest maxima are in the 0 ° -180 ° plane at about ± 55 °. In the plane perpendicular thereto, ie the plane 90 ° -270 °, the maxima are less pronounced and are about ± 35 °.

In the illustration after FIG. 6 the light intensities are plotted in a cone-sheath curve, ie they show a measurement of the light intensity along the edge of a conical surface around the surface normal 28 of the LED matrix. For a circularly symmetric LED, only circles would be visible in this illustration. However, the LEDs of the illustrated embodiment have an oval luminous intensity distribution. Accordingly, the light intensities are distorted in the cone angle curves oval or even have a constriction along the shorter axis.

The LEDs 22 and the integrated optics are arranged in the LED module so that the extended maxima (ie the maxima at ± 55 ° in the 0 ° -180 ° plane according to FIG. 7 or the 0 ° -180 ° axis of FIG. 6 ) are aligned in the direction transverse to the reflector strip 26. In FIG. 10, the directions of the maxima are represented by two light beams. These indicate the position of the maxima in accordance with FIG. 7 a deflection of ± γ relative to the surface normal 28 by the LED 22 on. The right of the two maxima leaves without reflection the LED module with the angle γ relative to the surface normal 28. The left of the two maxima is emitted in the direction of the reflector strips 26 and reflected once. By the arrangement of the reflector strip 26 with 90 ° with respect to the plane 24, the reflection takes place in a direction which is offset parallel to the direction of the opposite maxima, which leaves the LED directly at the angle γ. In the total light distribution of the LED module, therefore, both maxima of the light intensity distribution add up. The parallel displacement of the two light beams, which shows the direction Displaying the maxima, plays no role in terms of the distance of the surfaces to be illuminated compared to the light.

Accordingly, the LED modules 22 generate a strongly asymmetrical light distribution which leaves the LED module at an angle of γ + α relative to the normal to the illuminant carrier surface 10.

With these modules 22, various embodiments of outdoor lights can be constructed, the example in the FIGS. 1 to 4 are shown. To generate a total light distribution, which is to have two symmetrical maxima on both sides, the LED modules 22 can be arranged in two rows, within which each LED modules are arranged in parallel, and the two rows are arranged mirror-symmetrically to each other. In this case, either the backs of the reflector strips 26 can face each other (see FIG. 1 ) or the LED modules can be arranged with the LEDs facing the reflective sides of the reflector strips 26 against each other (see FIG. 2 ). Both embodiments produce about the same light distribution. These lights are particularly suitable as a path or street light, which is located above the path or road section to be illuminated, because the total light distribution generated can evenly illuminate an elongated surface, ie parallel to the road or to the way.

The FIGS. 3 and 4 show alternative embodiments intended to produce a light band buckling. By this is to be understood that the total light distribution of the luminaire produced has no two 180 ° opposite maxima (as in FIG. 6 ), but that the maxima with respect to an axis (corresponding to the 0 ° -180 ° axis in FIG. 6 ) are inclined. Such lights are particularly suitable for illuminating streets by lights that are arranged laterally next to the road. The light band buckling is generated by reflector modules whose longitudinal edges, ie the edge between the plane 24 and the reflector strip 26, extend along a curved curve. Both FIGS. 3 and 4 Accordingly, in particular, each ensure the front six LED modules 22 for Lichtbandknickung. The two rear LED modules mainly illuminate the area under the luminaire.

Further modifications of the previously described embodiments are possible within the scope of the invention, which is defined by the claims. In particular, the invention provides that the LED modules can be arranged as desired on the illuminant carrier surface in order to produce desired light distributions. For example, the LED modules could also be arranged in a circle to form a street lamp illuminating a round place or a roundabout from the center. Other forms are also possible.

LIST OF REFERENCE NUMBERS

10

Lamp support surface

20

LED module

22

LED

24

level

26

reflector strips

27

fastener strips

28

surface normal

Claims (10)

1. Luminaire, in particular outdoor luminaire, having an illuminant carrier surface (10) on which a plurality of LED modules (20) are arranged,
   wherein the LED modules (20) each comprise a matrix of a plurality of LEDs (22) arranged in a plane (24) and a reflector strip (26) adjacent an edge of the plane (24) and angled relative to the plane (24),
   characterized in that the LEDs (22) each have an integrated optic which, in a cross-section through the LED (22) perpendicular to the plane (24), generates two maxima of the light intensity distribution of the respective individual LED (22) which are laterally deflected by the LED (22) relative to the surface normal (28) on the plane (24), the light radiation of the LED (22) being reflected by the reflector strip (26) in one of the two maxima.
2. Luminaire according to claim 1, wherein the integrated optics deflects a deflection of the maxima of the light intensity distribution curve of the respective individual LEDs in said cross-section relative to the surface normal by an angle γ of at least ±10°, preferably by at least ±20° or ±30°.
3. Luminaire according to one of the preceding claims, wherein the individual LEDs (22) with integrated optics have an oval or circular radiation characteristic relative to the surface normal (28) of the plane (24) through the LED (22).
4. Luminaire according to one of the preceding claims, wherein in the LED modules the reflector strips (26) form an angle of 65° to 115° to the plane (24), preferably between 85° and 95°.
5. Luminaire according to one of the preceding claims, the planes (24) of the LED modules (20) forming an angle α different from 0° to the illuminant carrier surface (10), preferably forming an angle α between 5° and 40° or -5° and -40°.
6. Luminaire according to one of the preceding claims, wherein the LED modules (20) are arranged parallel to one another in at least one row on the illuminant carrier surface (10).
7. Luminaire according to claim 6, wherein at least two rows of the LED modules (20) are arranged mirror-symmetrically.
8. Luminaire according to one of the preceding claims, at least some of the LED modules (20) being arranged such that the edges at which the reflector strips (26) adjoin the plane (24) are not aligned parallel to one another.
9. Luminaire according to one of the preceding claims, wherein the distance of the LEDs (22) in the matrix to the next adjacent LED (22) is at least 20 mm, preferably between 25 mm and 50 mm.
10. An LED module (20) for mounting on an illuminant support surface (10) of a luminaire according to one of the preceding claims, the LED module (20) comprising a matrix of a plurality of LEDs (22) arranged in a plane (24) and a reflective strip (26) adjacent an edge of the plane (24) and angled relative to the plane, characterized in that the LEDs (22) each have an integrated optic which, in a cross-section perpendicular to the plane (24), generates two maxima of the light intensity distribution of the individual LED (22) in each case, which maxima are deflected laterally relative to the surface normal (28) on the plane (24) through the LED (22), and the light radiation of the LED (22) in one of the two maxima is reflected by the reflector strip (26).

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