EP2375128B1 - Light fixture with LEDs and lenses assigned to the LEDs - Google Patents

Description

The present invention relates to a luminaire according to the preamble of claim 1, which has a housing which has a light exit opening, and a plurality of light sources arranged in the housing in the form of LEDs, wherein the LEDs are associated with lenses.

The progressive development of LEDs in recent years means that such light sources are increasingly being used for lighting purposes. The achievable with the help of LEDs light levels are now sufficiently high, so that LEDs in almost all applications can replace previously used classical light sources such as light bulbs, fluorescent lamps or the like. An advantage of using LEDs is that they provide very good opportunities to change or modify the light output. For example, modern LED-based light sources offer, in particular, the possibility of choosing the color or color temperature of the emitted light.

Basically, LEDs emit light in a relatively large angular range. It is therefore customary to associate with the LEDs optical elements, for example small reflectors or lenses, by means of which the light output is restricted or concentrated to a specific spatial area. In this way it can be ensured that the light emitted by the luminaire as a whole does not cause any glare or disturbing reflections on a reflecting surface, for example a screen, in the case of an observer.

If LEDs are used as light sources, it must also be taken into account that they should be cooled sufficiently in comparison with conventional light sources. Although LEDs no longer generate waste heat in comparison with other light sources, this is concentrated in a smaller area due to the significantly different size ratios of LEDs. As a result, very high temperatures can occur in the vicinity of the LEDs, which is why an efficient dissipation of heat is imperative. Furthermore, the light sources should be protected against external influences as much as possible.

From the US Pat. No. 7,633,684 B1 is an LED lamp with a profile-shaped heat sink known. Through the heat sink, a light exit opening is formed, which is covered by a lens element.

From the EP 2 151 899 A2 an LED lamp with a support element and a control gear is known; In this case, the LEDs are arranged on one side of the carrier element and the operating device is arranged opposite the LEDs on the other side of the carrier element.

The present invention has for its object to provide a novel solution for the use of LEDs in luminaires, in which the above requirements can be met in a simple manner.

The object is achieved by a luminaire having the features of claim 1. Advantageous developments of the invention are the subject of the dependent claims.

The solution according to the invention is based on the idea of assigning lenses to influence the output of light, wherein a plurality of lenses are combined to form an optical element and this optical element is designed such that it simultaneously fulfills a shielding function such that the LEDs are protected from external influences are. In particular, the optical element is designed such that it closes the housing in the emission direction.

According to the invention, accordingly, a luminaire is proposed with a housing formed by a profile body, which has a light exit opening, a plurality of light sources arranged in the housing in the form of LEDs and the LEDs associated with the lenses, according to the invention a plurality of lenses are joined together to form an optical element which the housing closes in the light emission direction.

The optical element according to the invention accordingly fulfills the two functions mentioned above, namely to influence the light output of the LEDs and to protect the LEDs from external influences. This in turn means that it is possible to dispense with a further covering of the luminaire housing in the light emission direction, for example a transparent cover pane or the like.

Preferably, each LED is associated with exactly one lens of the optical element. In order to fulfill the protective function, while the optical element may have laterally extending arms of the lenses, which each extend to a side wall of the housing. In particular, these arms can have a certain flexibility, so that a simple snapping of the optical element is made possible in the housing. Alternatively, it can also be provided that the optical element has side walls which extend to a support for the LEDs.

The dissipation of the heat generated by the LEDs can be optimized in that - as provided according to the invention - the LEDs on a Carrier are arranged, which is substantially perpendicular to a Lichtabstrahlrichtung the lamp through the housing extends. The carrier is integrally connected to the side walls of the housing. The housing itself then serves as a heat sink for the LEDs.

The profile body is substantially H-shaped and accordingly has two side walls running parallel to one another and a center leg connecting the two side walls, wherein the carrier is formed by the center leg.

The carrier of the LEDs is arranged centrally in the housing in the light emission direction, such that a free space remains above the carrier. Means for power supply and for operating the LEDs, in particular a corresponding operating device, are then arranged above this free space, ie at a distance from the carrier, so that the heat transfer from the LEDs to these electronic components is reduced as far as possible. Accordingly, overheating of the temperature-sensitive components can be effectively prevented.

According to a particularly preferred embodiment it is provided that the optical element has a certain flexibility and is attached to the lamp housing, that it exerts a certain pressure on a board on which the LEDs are arranged. The board with the LEDs is thereby pressed against the carrier, so that an optimal heat coupling between the LED board and housing is achieved. This measure also contributes to improved heat dissipation.

Figur 1

eine Stirnansicht eines ersten Ausführungsbeispiels einer erfindungsgemäßen Leuchte;

Figur 2

eine Schnittdarstellung der Leuchte von Figur 1;

Figur 3

eine Ansicht des oberen Bereichs der Leuchte mit dem zur Montage an einem Stromschienensystem ausgebildeten Drehabgriff;

Figur 4

eine perspektivische Ansicht des Endbereichs der Leuchte der Figuren 1 bis 3;

Figur 5

eine Schnittdarstellung der in die Tragschiene des Stromschienensystems eingesetzten Leuchte;

Figur 6

die Schnittdarstellung eines zweiten Ausführungsbeispiels einer erfindungsgemäßen Leuchte;

Figur 7

die Ansicht eines bei dem zweiten Ausführungsbeispiel zum Einsatz kommenden optischen Elements und

Figur 8

eine perspektivische Ansicht des Endbereichs der Leuchte von Figur 6.

The invention will be explained in more detail with reference to the accompanying drawings. Show it:

FIG. 1

an end view of a first embodiment of a lamp according to the invention;

FIG. 2

a sectional view of the light of FIG. 1 ;

FIG. 3

a view of the upper portion of the lamp with the trained for mounting on a busbar system Drehhab;

FIG. 4

a perspective view of the end portion of the lamp of FIGS. 1 to 3 ;

FIG. 5

a sectional view of the lamp used in the mounting rail of the busbar system;

FIG. 6

the sectional view of a second embodiment of a lamp according to the invention;

FIG. 7

the view of an optical element used in the second embodiment, and

FIG. 8

a perspective view of the end portion of the lamp of FIG. 6 ,

The two exemplary embodiments of a luminaire according to the invention explained below are each a so-called beam luminaire, that is to say an elongated luminaire, which is provided for use in a busbar system. It should, however, already be pointed out that the concept according to the invention, namely to combine the lenses assigned to the LEDs to form an optical element which at the same time also forms a light exit element for the luminaire, can also be used for other luminaires which are not suitable for connection a Stromschicnensystem are provided. Also, the inventive concept is not limited to elongated luminaire shapes.

The in the FIGS. 1 to 4 illustrated lamp 1 has as an element supporting an elongated profile body 2, which may be formed, for example, as an aluminum extruded profile. The profile body is substantially H-shaped and accordingly has two mutually parallel side walls 3 and 4 and the two walls 3, 4 connecting center leg 5. At the top of the side walls 3 and 4 in each case an inwardly directed gradation is formed. Once again, a short arm 3a or 4a extends upwards. Each of these arms 3a and 4a has two inwardly directed webs, whereby in each case a longitudinally extending groove 3b or 4b is formed. These two grooves 3b, 4b allow the frontal insertion of a base portion 11 of a so-called. Drehabgriffs 10, which is particularly the sectional view of FIG. 2 can be removed.

The Drehabgriff 10 serves to allow the mechanical attachment of the lamp 1 to a support rail and also to contact running within the support rail lines. He has for this purpose corresponding projections 12 and 13 contacts, which can be swung laterally by twisting and thereby engage behind projections of the support rail or get into abutment against corresponding conductor. In principle, such Drehabgriff is already known, including, for example, on the DE 100 25 647 A1 referred to the applicant becomes. In this document, a Drehabgriff is described on a beam lamp, which is accessible from the bottom and can be rotated by a corresponding handle. Since in the luminaire according to the present invention the underside of the rotary handle 10 is not accessible or accessible, it is provided in the present case that the actuation takes place via a laterally projecting lever 15. This lever 15 passes through a formed on the upper arm 3a slot 3c (see in particular FIG. 3 , which shows both positions of the lever 15), and can accordingly be operated comfortably even in the assembled state of the lamp 1. In attached to the mounting rail state then results in FIG. 5 illustrated configuration showing the arranged within a support rail 100 Drehabgriff 10. It can also be seen here that the mechanical locking projections 12 engage behind inwardly directed projections of the mounting rail 100. As a result, the rotary handle 10 and the profile body 2 connected to the rotary handle 10, that is to say ultimately the entire lamp 1, are securely held on the mounting rail 100.

In principle, such a procedure is already known for bar lights which are intended for use in a busbar system. The luminaire does not necessarily have to be arranged with the rotary knob on the mounting rail. Depending on where and how the lines run for power supply and / or signal transmission within the mounting rail, the configuration of the contacting element can also be adjusted accordingly.

A special feature now consists in the arrangement of the light sources and the cover of the lower portion of the lamp, which will be explained in more detail below.

First, it is provided that LEDs are used as light sources. Strictly speaking, a plurality of LED modules 20 are arranged on the underside of the center leg 5 of the profile body 2 in the longitudinal direction one behind the other, each having an elongated board 21 and LEDs 22 arranged thereon. In a lamp of conventional length usually about 4 to 5 such LED modules 20 are arranged one behind the other in the longitudinal direction. The attachment of the LED modules 20 to the center leg 5 is preferably carried out by gluing, although a screw or locking connection would be conceivable.

A first special feature consists in the fact that the upper half space 6, which is formed by the subdivision of the profile body 2 through the center leg 5, remains substantially unused. That is, within this space 6 are only In particular, the - not shown - means for power and for operating the LED modules 20 (for example, a corresponding operating device) at the top of the profile body 2, that is arranged at the same height as the Drehabgriff 10. This in turn means that these partially temperature-sensitive components are arranged at a certain distance from the LEDs 22, with the result that the heat generated by the LEDs 22 reaches only a very small part of these components. Overheating of these elements during operation of the lamp 1 is accordingly excluded.

Instead, the removal of heat via the center leg 5 and the side walls 3 and 4 of the profile body takes place. Since this is integrally formed, a good heat coupling and transmission is made possible, so that ultimately from the side walls 3 and 4, the heat can be effectively released to the environment. The profile body 2 accordingly also represents a heat sink for the LED light sources.

The light emitted by the LEDs 22 is emitted by means of a lens arrangement which is part of an optical element 30. Its configuration may in particular the representation of FIG. 2 be removed. In this case, the optical element 30 has a central region 31, which is formed by a plurality of lens regions 32 arranged one behind the other in the longitudinal direction. In this case, each LED 22 is preferably associated with its own lens region 32, which, in accordance with the sectional view, widens slightly toward the underside and has a slightly curved light exit surface 32a. The LED 22 faces a preferably rotationally symmetrical, frusto-conical recess 33 into which the LED 22 projects. The configuration of this recess 33 and the bulge 32a can be varied as needed to bundle the LED light in the desired manner.

A special feature of the optical element 30 is now that it forms a light exit plate for the lamp 1, so the lamp housing 2 terminates in the light emission direction. For this purpose, side arms 34 and 35, which extend to the side walls 3 and 4 of the profile body 2, extend laterally of the central region 31. These longitudinally continuously formed arms 34 and 35 are slightly downwards, ie curved in the light exit direction and have a certain flexibility, which makes it possible to clamp the optical element 30 as shown in the lower half space of the profile body 2. As a result, the formed in the lower region of the profile body 2 light exit opening of the lamp 1 in Light emission seen closed so that it can be dispensed with the use of other covers.

A particular advantage of the flexibility of the side arms 34 and 35 of the optical element 30 is also that due to the flexibility of the central region 31 is biased with the lenses 32 to the top, so presses against the board 21 of the LED modules 20. The LED modules 20 are accordingly pressed with a certain force against the center leg 5 of the profile body 2, which additionally increases the heat coupling and thus the efficiency in dissipating the heat.

Eventually, a configuration like the one in FIG. 4 is shown. It can be seen here that the optical elements 30 do not extend over the entire length of the luminaire 1. Instead, the length of an optical element 30 is preferably matched to the length of an LED board 20, ie there are as many optical elements 30 as there are LED boards 20 in the profile body 2. In this case, the optical elements 30 abut against one another in a stimulus manner, so that the penetration of dust from the underside is largely suppressed. At the ends of the lamp 1, on the other hand, closing elements 38 are still provided, which are pushed onto the profile body 2 on the face side. For this purpose, the preferably transparent closure elements 38 have two lateral slot-like recesses 39, which enable sliding onto webs 7 and 8 of the profile body directed towards the inside.

The task of these end parts 38 is to prevent a light emission in the region of the side walls 3 and 4, in particular at the joints between two adjacent lights 1. Accordingly, the use of these end parts 38 within a lamp 1 is not absolutely necessary, since the side walls 3 and 4 of the profile body 2 are continuous and accordingly no light leakage is to be feared. In addition, the joint between two adjacent lights could also be covered by a bracket 40, which is snapped onto the outside of the profile body 2. Such a clip 40 is in FIG. 5 shown schematically.

Ultimately, therefore, a lamp is created in which LEDs can be used as light sources in an effective manner and at the same time also influences the light output in the desired manner and the heat can be dissipated effectively. These different tasks are achieved by using a very small number of different components.

Based on FIGS. 6 to 8 Yet another embodiment of a lamp according to the invention will be explained, which in turn is a bar light, which is intended for use in a busbar system.

This second embodiment differs primarily in terms of the design and arrangement of the optical element 130. This is now not snapped into the profile body 2 with the aid of two downwardly directed side arms, but initially has two vertically oriented side walls 134 and 135, which protrude upwards. At the top of these side walls 134, 135 then hooks 136, 137 are formed, which are designed for locking with the transverse web 5 of the profile body 2. For this purpose, the transverse web 5 has, in its middle region, a projection 106 which is formed towards the underside and forms a planar bearing surface for mounting the LED modules 20. Laterally of this bearing surface 106 are two directed towards the bottom arms 107, 108 are formed, which have projections over which together with the latching arms 136, 137 of the optical element 130 can be made a latching.

With regard to the configuration of the central region 131, this optical element 130 is in the same way as in the variant of FIGS. 1 to 5 educated. Here, too, associated with the individual LEDs 22 associated lens areas 132, which have recesses 133 for receiving the LEDs. Again, the hooking or latching of the optical element 130 takes place in the profile body 2 such that the optical element 130 presses the LED board 20 against the transverse web 5 of the profile body.

Also in this second variant is at the upper end of the profile body a - not shown - Drehabgriff for connecting the lamp 1 is provided to a busbar system. The electronic components for operating the LED boards 20 are in turn arranged at a distance from the transverse web 5.

In the FIGS. 7 and 8 the optical element 130 is shown with a transparent end wall 138. This is to represent an optical termination in particular at the end regions of a longer arrangement of a plurality of lights arranged one behind the other. In the same way, the profile body in the upper area would have to be closed by a closing element (not shown in detail).

In this second variant, too, the advantage is achieved that a protection for the LEDs is provided by the lens arrangement as an optical element and At the same time the need for a separate cover for the lamp housing deleted. Furthermore, the heat transfer from the LEDs to the profile body acting as a heat sink is improved by the fact that the optical element presses the LED board against the heat sink.

Claims (6)

1. A luminaire (1) with a housing formed by a profiled element (2), which housing has a light exit opening, a plurality of light sources arranged in the housing in the form of LEDs (22), as well as lenses (32, 132) assigned to the LEDs (22),

   wherein a plurality of lenses (32, 132) are combined to form one optical element (30, 130), which closes the housing in the light emission direction, wherein the LEDs (22) are arranged on a carrier (5), which extends substantially perpendicularly to a light emission direction of the luminaire (1) through the housing,

   wherein the profiled element (2) is designed substantially H-shaped and accordingly has two side walls (3, 4) running parallel to one another as well as a central leg (5) connecting both side walls (3, 4),

   wherein the carrier (5) is formed by the central leg (5),

   wherein the carrier (5) is connected integrally with the side walls (3, 4) of the housing, characterized in that

   means for the power supply and for the operation of the LEDs (22) are arranged spaced apart from the carrier (5) on the sides of the carrier opposite the LEDs (22),

   wherein between the carrier (5) and the means for the power supply and for the operation of the LEDs (22) a free space is formed, in such a manner that a heat transfer from the LEDs (22) to the means for the power supply and for the operation of the LEDs (22) is reduced.
2. A luminaire according to Claim 1,
   characterized in
   that in each case precisely one lens (32, 132) of the optical element (30, 130) is assigned to each LED (22).
3. A luminaire according to any one of Claims 1 or 2,
   characterized in
   that the optical element (30, 130) is arranged in the housing in such a manner that it presses a board (21), on which the LEDs (22) are arranged, against the carrier (5).
4. A luminaire according to any one of Claims 1 to 3,
   characterized in
   that the optical element (130) has side walls (134, 135), which extend up to the carrier (5) for the LEDs (22).
5. A luminaire according to any one of Claims 1 to 4,
   characterized in
   that the optical element (30) has arms (34, 35) extending laterally from the lenses (32), which in each case extend up to a side wall (3, 4) of the housing.
6. A luminaire according to any one of the preceding claims,
   characterized in
   that the LEDs (22) are arranged on a plurality of boards (21) arranged behind one another, wherein in each case one optical element (30, 130) is assigned to each board (21).

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