EP2871407B1 - Assembly for emitting light and light with such an assembly - Google Patents

Description

The invention relates to a light emitting device comprising a plurality of LED light sources (LED: light emitting diode) arranged on a printed circuit board and a raster element having a plurality of cell-like raster regions, the arrangement being such that each of the LED light sources one of the screen areas is optically assigned. Furthermore, the invention relates to a luminaire with such an arrangement.

From the prior art, such an arrangement in the form of a grid lamp is known, in which the cell-like grid areas of the grid element are formed by pot-shaped reflectors; The light of the LED light sources is deliberately emitted via these pot-shaped reflectors.

In such a grid light, it may happen that the light output shows undesirable properties, for example with respect to a glare. Although a suitable glare of the light emerging from a cell or a top reflector can be achieved by using a lens for influencing the light in addition to the reflector, the problem in this case arises, in particular in the case of a louvered luminaire Such lenses today are usually made of a plastic material and therefore significantly more expand when heated than the relevant board on which the LED light sources are arranged. Therefore, due to temperature fluctuations, it may happen that the orientation or positioning of the lenses relative to the LED light sources undesirably changed and thus the light output is in turn adversely affected.

Another problem is that the tolerances in the manufacture of large plastic parts by injection molding are relatively large. Therefore, it is usually not suitable to form corresponding lenses integral with the grid element.

From the US 2011/0194282 A1 a light emitting device is known which comprises an LED board, a grid-like reflector and a lens assembly which is positioned over positioning elements facing the LED board. The LED board is connected to a heat sink.

From the US 2006/0268548 A1 There is known a light emitting device comprising an LED board, a reflector assembly and lens cover.

From the US 2011/0103051 A1 An arrangement for emitting light with an LED board, with lenses and a cover is known. The cover is bolted to a heat sink.

The invention has for its object to provide a corresponding improved arrangement for light output. In particular, the arrangement should offer particularly good production possibilities with particularly good optical properties. In addition, a corresponding light should be specified.

This object is achieved according to the invention with the object mentioned in the independent claim. Particular embodiments of the invention are indicated in the dependent claims.

According to the invention, there is provided a light emitting device having LED light sources, a circuit board on which the LED light sources are disposed, and a raster element having cell-like raster regions. In this case, the arrangement is designed such that each of the LED light sources is assigned to one of the screen areas optically. Furthermore, the arrangement has lens elements, as well as positioning elements. The positioning elements are designed and arranged such that the lens elements are arranged positioned by the positioning elements relative to the board.

As a result of this design, the lens elements can be manufactured as components that are independent of the grid element or not mechanically connected to the grid element, so that in particular the problem outlined above with respect to large manufacturing tolerances in injection-molded parts is eliminated. A reliable alignment of the lens elements with respect to the LED light sources can be achieved by the positioning elements.

Preferably, the positioning elements comprise pin-like regions, wherein the board has corresponding recesses for this purpose and the lens elements are arranged positioned relative to the board by the pin-like regions are arranged engaging in the recesses. With this design, a suitable positioning of the lens elements is made possible in a comparatively simple manner.

According to the invention, in each case at least one of the positioning elements is connected to a plurality of the lens elements to form a lens element group. In this way, the number of components of the arrangement can be reduced; this is manufacturing technology advantageous. If each lens element group has exactly one positioning element, a particularly simple assembly of the device is made possible. In this way, if each lens element group has at least two positioning elements, it can be suitably ensured that during assembly the lens element groups are arranged opposite the board in intended orientations.

In this case, the lens element groups preferably each comprise between two and eight of the lens elements, in particular in each case between three and six, particularly preferably four. In this way, the lens element groups are advantageously made so large that on the one hand a total of low number of components of the arrangement is possible, on the other hand, however, even with temperature fluctuations still sufficiently accurate alignment of all lens elements of a group is made possible with respect to the board.

Preferably, the lens element groups are designed so that the positioning elements are formed with respect to the respective lens elements of the respective lens element group in a central region, in particular centrally arranged. In this way, a temperature fluctuation-induced relative change in position between the lens elements and the board can be kept particularly small.

According to the invention, the lens element groups are each designed in one piece. This is manufacturing technology advantageous. In particular, this facilitates the assembly of the arrangement.

Preferably, the lens element groups are made of plastic; in particular, they can advantageously be designed as injection molded parts in terms of production technology.

Preferably, the arrangement is designed such that the lens elements are arranged engaging in the grid areas. This makes it possible to achieve suitable that the lens element groups can initially be arranged engaging in accordance with the grid element in the assembly and then in a further step, the board is connected by means of the positioning elements with the lens elements, being particularly suitable by the grid element ensure certain orientations to the board.

If the lens elements are intermeshingly arranged with play in the raster areas, it can be achieved that the lens elements can move with respect to the raster element in the event of temperature fluctuations so that corresponding thermal expansions can be absorbed without this becoming detrimental to lighting technology.

Preferably, the cell-like grid areas are designed to be reflective. As a result, the arrangement is particularly suitable for a grid lamp.

Preferably, the arrangement is designed such that the grid element - viewed against a surface normal of the board - surrounds the board across all sides. As a result, a suitable protection against unwanted contact of the board is formed.

Preferably, at least a portion of the lens elements have side wing portions that are configured to provide lateral contact protection for the board. This makes it possible to form a further contact protection for the board.

According to the invention, the arrangement further comprises a carrier element, which is arranged opposite to the LED light sources with respect to the circuit board. In this case, the grid element has latching elements, which are arranged to cooperate with corresponding counter-latching elements of the carrier element, in particular for fastening the grid element relative to the carrier element. By this design, an all-encompassing protection of the board and the lens elements is particularly suitable; In principle, a housing of a luminaire can thereby be formed in such a way that a luminaire is formed by the arrangement itself.

According to a further aspect of the invention, a luminaire is provided which has an arrangement according to the invention for emitting light.

Fig. 1

eine Skizze nach Art einer Explosionsdarstellung eines Ausführungsbeispiels einer erfindungsgemäßen Anordnung,

Fig. 2

eine perspektivische Skizze eines Bereichs der Linsenelemente und des Raster-Elements,

Fig. 3

eine Querschnitt-Skizze eines Endbereichs der Anordnung,

Fig. 4

eine, der Fig. 3 entsprechende, etwas detailliertere Skizze,

Fig. 5

eine perspektivische, durchscheinend gezeichnete Skizze der zusammengesetzten Anordnung und

Fig. 6

eine perspektivische Skizze einer Sicherung der Verbindung zwischen dem Raster-Element und dem Träger-Element der Anordnung.

The invention is explained in more detail below with reference to an embodiment and with reference to the drawings. Show it:

Fig. 1

a sketch in the manner of an exploded view of an embodiment of an inventive arrangement,

Fig. 2

a perspective sketch of a portion of the lens elements and the raster element,

Fig. 3

a cross-sectional sketch of an end portion of the arrangement,

Fig. 4

one of the Fig. 3 corresponding, somewhat more detailed sketch,

Fig. 5

a perspective, translucent drawn sketch of the composite arrangement and

Fig. 6

a perspective sketch of a fuse of the connection between the grid element and the carrier element of the arrangement.

In Fig. 1 is a sketch of an arrangement according to the invention for the delivery of light in the manner of an exploded view, Fig. 5 shows the arrangement assembled as intended, with the parts are outlined diagrammatically.

The arrangement comprises LED light sources 21, 22. It may be provided that the LED light sources 21, 22 each have one LED or a plurality of LEDs as light-emitting elements; For example, this can be provided an LED cluster, such as a red, a green and a blue LED.

Furthermore, the arrangement comprises a circuit board 1, on which the LED light sources 21, 22 are arranged. Through the circuit board 1 and the LED light sources 21, 22, an LED module may be formed. Preferably, the circuit board 1 is substantially planar, so that it extends in a plane. In the present description, it is assumed that the board 1 is oriented substantially horizontally; In particular, the LED light sources 21, 22 are arranged on one of the two large upper sides of the circuit board 1, here on the downward-pointing upper side of the circuit board 1 (in FIG Fig. 1 the circuit board 1 is diagrammatically outlined, so that the LED light sources 21, 22 are recognizable despite the perspective). In general, however, can also be provided for the operation of the arrangement, a different orientation of the board 1 relative to the vertical; In this case, the directions used here, etc. are to be reinterpreted accordingly.

Furthermore, the arrangement has a raster element 3 with cell-like raster areas 31, 32. In this case, the arrangement is designed such that each of the LED light sources 21, 22 is optically assigned to one of the raster regions 31, 32, in particular exactly one of the raster regions 31, 32. In particular, the design can be such that one of each of the LED Light sources 21, 22 emitted light is discharged through the respectively associated cell-like grid area 31, 32 into an outer space of the arrangement.

The cell-like raster regions 31, 32 can be designed to be reflective, for example designed as cup-shaped reflectors, each of which forms a light emission opening on its underside and a light entrance opening on its upper side. Preferably, the reflectors are shaped so that they have reflective, for example, white side walls, which are formed in particular diverging downwards.

In the example shown, the raster element 3 comprises, in addition to the cell-like raster areas 31, 32, a support structure which extends between the raster areas 31, 32 and around the raster areas 31, 32, thereby holding the raster areas 31, 32 together. The support structure and the grid areas 31, 32 may be designed in particular opaque or opaque.

The raster element 3 may be made of polycarbonate, for example. Preferably, the grid element 3 is designed white.

Further preferably, the design of the arrangement is such that the raster element 3 - viewed against a surface normal of the board 1 - the board 1 on all sides encompasses. Accordingly, in the example shown, the raster element 3 in the vertical projection surrounds the circuit board 1 on all sides. This makes it possible to form a suitable protection of the board 1 against accidental contact. A corresponding protection is on the one hand advantageous for a user of the arrangement, since the board 1 during operation of the device usually has parts that can lead to electric shock when touched by a user, on the other hand, the protection is advantageous because a corresponding Touch especially the LED light sources 21, 22 or could damage the LED module.

As in the example shown, the raster element 3 forms a cover element of the arrangement. Accordingly, by the raster element 3, an outer surface area of the arrangement may be formed.

Furthermore, the arrangement has lens elements 41, 42, wherein in particular in each case one of the lens elements 41, 42 exactly one of the LED light sources 21, 22 is optically assigned. In this case, the lens elements 41, 42 are preferably optical between the LED light sources 21, 22 on the one hand and the cell-like grid areas 31, 32 on the other hand. Accordingly, the light emitted by the LED light sources 21, 22 is first optically influenced by the associated lens elements 31, 32 and subsequently by the associated cell-like raster region 31, 32.

It may be provided in this sense that the arrangement has a certain number of LED light sources and the number of lens elements 41, 42 and also the number of cell-like raster areas 31, 32 are each identical to the number of LED light sources 21, 22 , In the example shown, the arrangement comprises thirty-two LED light sources 21, 22, thirty-two lens elements 41, 42 and thirty-two cell-type raster elements 31, 32.

Furthermore, the arrangement has positioning elements 5, which are configured and arranged such that the lens elements 41, 42 are arranged positioned relative to the board 1 by the positioning elements 5. This makes it possible to achieve a particularly suitable alignment or positioning of the lens elements 41, 42 with respect to the circuit board 1.

In this case, the lens elements 41, 42 are preferably not connected to the raster element 3 connected together or not mechanically connected to the raster element 3. In particular, they may consist of a different material than the raster element 3. Preferably, the lens elements 41, 42 are made of a clear material. For example, they may be made of a plastic, such as polymethyl methacrylate (PMMA). Advantageously, the lens elements 41, 42 can be designed as injection-molded parts. In this way, the lens elements 41, 42 can be made particularly suitable independently of the raster element 3.

The positioning elements 5 preferably have pin-like areas or consist of such and the board 1 preferably has for this purpose corresponding recesses 11, wherein the lens elements 41, 42 are positioned relative to the board 1 by the pin-like areas are arranged engaging in the recesses 11 ,

Preferably, in each case at least one of the positioning elements 5 is connected to a plurality of the lens elements 41, 42 to form a lens element group. In the example shown, exactly four lens elements 41, 42 are each with exactly one Positioning element 5 connected to a lens element group, so that in the example shown, the arrangement comprises a total of exactly eight lens element groups. The lens element groups are preferably each made of one piece or designed in one piece.

In Fig. 2 is shown in somewhat more detail outlined such a lens element group. For example, as shown, the lens elements 41, 42 may be mechanically interconnected by webs 6, wherein the positioning element 5 is formed at the intersection of the webs 6 and is thus arranged centrally with respect to the lens element group. The lens element groups preferably each consist of the corresponding lens elements 41, 42, the webs 6 and the positioning element 5.

By means of such a group formation, it is possible to achieve that the arrangement as a whole comprises fewer components and thus facilitates a simplified assembly of the arrangement. If one were to make all lens elements 41, 42 mechanically cohesive, one would indeed have to deal with only one component, but there would be the risk that at a temperature fluctuation-related expansion of this component, in particular the edge-side lens elements their intended positions relative to their respective associated LED Leave light sources. If the lens element groups, as shown by way of example, each comprise exactly four lens elements 41, 42, the size of the lens element groups can be particularly suitably chosen such that the number of components is correspondingly reduced, but on the other hand there is practically no danger that remove the lens elements from their intended positions relative to the LED light sources.

In this sense, it is preferably provided that the lens element groups each comprise between two and eight of the lens elements 41, 42, in particular between three and six and, as already mentioned, particularly preferably exactly four lens elements 41, 42nd

As shown, the lens element groups may be designed so that the positioning elements 5 are formed with respect to the respective lens elements 41, 42 of the lens element group in question in a central region, in particular centrally arranged. In this case, a centering element may advantageously be formed by the positioning element 5 in this case. This way you can have a Potential temperature fluctuation-induced change in position of a lens element 41, 42 relative to the positioning element 5 hold comparatively small.

It may also be provided (not shown in the figures) that each lens element group comprises at least two positioning elements. In this way, an intended orientation of the lens element group with respect to the board can be ensured in a particularly suitable manner.

In Fig. 3 is a section of a cross section through the grid element 3, the lens elements, 41, 42, the circuit board 1 and the LED light sources 21, 22 sketched, Fig. 4 shows a sketch, a bit more detailed. As shown by way of example, in the example shown, the design is such that the lens elements 41, 42 are arranged to engage in the grid areas 31, 32, in particular to engage in engagement with the grid areas 31, 32. In this case, the design may in particular be such that the lens elements 41, 42 are respectively arranged engaging in the light entry opening of the relevant cell-like raster region 31, 32.

In this way-with only one positioning element 5 per lens element group-an orientation of the lens element groups with respect to the LED light sources 21, 22 is ensured, at least with an accuracy sufficient for practice, wherein, due to the play, a thermal expansion of the lens element Groups is possible, in particular without it comes to undesirable voltages relative to the grid element 3. By this configuration, so to speak, a stop for the lens element group is formed, which acts in the sense of a rotation.

As in Fig. 1 indicated, the arrangement may further comprise a carrier element 7, which is arranged opposite the LED light sources 21, 22 with respect to the circuit board 1, in the orientation considered here above the board 1. Here, the design is preferably such that the carrier element 7 viewed in a projection normal to the board 1, the circuit board 1 encompasses all sides. This allows a particularly good contact protection.

As in the example shown, the design can also be such that the grid element 3 cooperates with the carrier element 7 so that a housing of the arrangement is formed by these two parts, which includes the circuit board 1 and the LED light sources 21, 22 encloses everywhere. Preferably, the carrier element 7, as exemplified in Fig. 5 indicated, designed cuboid in first approximation, so that it surrounds the Patine 1 and the LED light sources 21, 22 from above and from all sides. In the example shown, it also surrounds the grid areas 31, 32, wherein it extends on all sides down practically to the grid element 3 out. In this way, an unwanted edge-side touch of the board 1 can practically be excluded.

For example, as shown, it can be provided that the grid element 3 has latching elements 8 which are arranged to cooperate with counter-latching elements 9 of the carrier element 7 corresponding thereto, in particular for fastening the grid element 3 relative to the carrier element 7 As shown, the locking elements 8 are formed as locking lugs and the corresponding counter-locking elements 9 as holes in the support element 7. In the circuit board 1 corresponding slots or holes 10 may be formed, wherein the locking elements 8, these holes 10 are arranged passing , As a result, a suitable securing a positioning of the board 1 relative to the grid element 3 and with respect to the carrier element 7 is made possible. To secure this latching connection can, as in Fig. 6 indicated, at least one screw 15 may be provided, which is screwed into the carrier element 7, so that it reliably prevents movement of at least one locking element 8 for opening the connection. In particular, this can be practically avoided that the arrangement can be opened without the aid of a tool.

How out Fig. 1 Furthermore, the arrangement may further comprise an operating device 12 for operating the LED light sources 21, 22. Preferably, the operating device 12 is arranged protected by an additional cover 13.

On the support element 7, a tab 14 may be formed, which is pivotally connected to the rest of the carrier element 7, wherein an access for electrical connections of the circuit board 1 is opened by pivoting the tab 14. Basically, when pivoting up or bending up the tab 14 there is the danger that electrically conductive areas of the circuit board 1 will be inadvertently touched by a user. Therefore, it is further preferably provided that at least a part of the lens elements 41, 42 has lateral wing portions 45, which are designed such that they form a lateral contact protection for the circuit board 1. At a matrix-like arrangement of the lens elements 31, 32, these wing regions 45 are preferably formed at the edge-side lens elements 41, 42.

The arrangement can form a flat and compact unit. In the embodiment shown by way of example, a housing is formed by the grid element 3 and the carrier element 7, as mentioned, so that the arrangement as such already forms a luminaire. However, the arrangement may also be provided as part of a luminaire, for example a ceiling light.

For assembly of the arrangement can be provided that in a first step, the lens element groups are placed as intended on the raster element 3, so that the lens elements 41, 42 inserted into the corresponding light entry openings of the cell-like raster areas 31, 32 engaging. In a second, subsequent step, the board 1 is then positioned so that the positioning elements 5 engage in the corresponding recesses 11 of the board 1. The locking elements 8 of the grid element 3 are thereby passed through the holes 11 of the board 1. After this step, the lens elements 41, 42 are aligned as intended relative to the LED light sources 21, 22. In a subsequent third step, the carrier element 7 is attached to the attached operating device 12 from above and mechanically connected by locking the locking elements 8 with the counter-locking elements 9 with the raster element 3. Then, in a further, fourth step with the further cover 13, the operating device 12 are covered; the connection between the carrier element 7 and the grid element 3 can be secured by the at least one screw 15.

The assembly thus assembled can then be electrically connected after bending the tab 14.

Thus, a particularly fast assembly is possible, in which the parts are assembled from a mounting direction. The assembly can be implemented with a few simple steps.

Claims (11)

1. An arrangement for light output, having

   - LED light sources (21, 22),

   - a circuit board (1) on which the LED light sources (21, 22) are arranged,

   - a grid-element (3) with cell-like grid areas (31, 32), wherein the arrangement is such that each of the LED light sources (21, 22) is optically assigned to one of the grid areas (31, 32),

   - lens elements (41, 42),

   - positioning elements (5), which are designed and arranged such that the lens elements (41, 42) are arranged positioned by the positioning elements (5) opposite the circuit board (1),

   wherein in each case at least one of the positioning elements (5) is connected with several of the lens elements (41, 42) to form a lens element group,

   - a carrier-element (7), which is arranged with regard to the circuit board (1) opposite the LED light sources (21, 22),

   characterized in
   that the lens element groups in each case are designed in one piece, and that the grid element (3) has latching elements (8), which are arranged interacting with counter-latching elements (9) of the carrier element (7) corresponding thereto.
2. An arrangement according to Claim 1,
   in which the positioning elements (5) comprise pin-like areas and the circuit board (1) has recesses corresponding thereto, wherein the lens elements (41, 42) are arranged positioned opposite the circuit board (1), while the pin-like areas are arranged engaging in the recesses (11).
3. An arrangement according to Claim 1 or 2,
   in which the lens element-groups in each case comprise between two and eight of the lens elements (41, 42), preferably in each case between three and six, in particular four.
4. An arrangement according to one of the preceding claims, in which the lens
   element groups are designed such that the positioning elements (5) are designed, in particular, arranged centrally with regard to the respective lens elements (41, 42) of the relevant lens element groups in a central area.
5. An arrangement according to one of the preceding claims,
   in which the lens element groups consist of plastic, in particular, are designed as injection-molded parts.
6. An arrangement according to one of the preceding claims,
   which is designed such that the lens elements (41, 42) are arranged engaging in the grid areas (31, 32), in particular, are arranged engaging with clearance in the grid areas (31, 32).
7. An arrangement according to one of the preceding claims,
   in which the cell-like grid areas (31, 32) are designed reflectively.
8. An arrangement according to one of the preceding claims,
   which is designed such that the grid element (3) - viewed contrary to a surface normal of the circuit board (1) - surrounds the circuit board (1) overlapping on all sides.
9. An arrangement according to one of the preceding claims,
   in which the at least one part of the lens elements (41, 42) has side wing areas (45), which are designed such that they form a side protection against contact for the circuit board (1).
10. An arrangement according to one of the preceding claims,
    in which the latching elements (8) are arranged interacting with counter-latching elements (9) of the carrier element (7) corresponding thereto to fasten the grid- element (3) to the carrier element (7).
11. A luminaire, having
    an arrangement for light output according to one of the preceding claims.

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