WO2017129621A1

WO2017129621A1 - Led luminaire with light guiding element

Info

Publication number: WO2017129621A1
Application number: PCT/EP2017/051554
Authority: WO
Inventors: Hans-Peter Koenigstein; Helmut Zahnbrecher
Original assignee: Siteco Beleuchtungstechnik Gmbh
Priority date: 2016-01-26
Filing date: 2017-01-25
Publication date: 2017-08-03
Also published as: DE102016104223A1; DE102016104221A1; DE102016104221B4

Abstract

The invention relates to a luminaire which has the following: a profile element, a carrier comprising at least one LED cluster and held on the profile element, and at least one light guiding element comprising a lens plate, which is arranged over the LED cluster, and comprising reflective side walls which are integrally connected to the lens plate and extend from the edges of the lens plate in a direction opposite to the LED cluster, wherein the light guiding element is held on the profile element so that the lens plate is positioned over the LED cluster.

Description

LED LIGHT WITH LIGHT CONTROL

DESCRIPTION

The present invention relates to a luminaire, in particular a linear luminaire, with at least one cluster of LEDs (which generally semiconductor light sources are understood, including organic semiconductor light sources) as Leuchtmit tel.

In the prior art lights are often provided with LED bulbs due to the advantages in energy conservation. However, compared to conventional bulbs, such as fluorescent tubes, the LED bulbs require other light directing elements because the LEDs emit the light as near-point radiators. Even a cluster of several LEDs, which are arranged over a surface, produce a light distribution which is not comparable to a conventional light source, which emits light over an extended surface section.

The LEDs can be associated with lenses or reflectors to design the light distribution according to the lighting task. However, these solutions are often very cost intensive, because the lenses and / or reflectors are arranged as individual components with respect to the LEDs.

Object of the present invention is to provide a luminaire with at least one LED cluster, which allows a simplified Lichtlenkstruktur.

The problem is solved by a luminaire according to claim 1.

A special feature of the lamp according to the invention consists in the nature of the light-guiding elements. These are from at least one - -

Lens plate and side reflector walls integrally gebil ^¬ det and are assigned as a whole to the LED cluster on the support. As a result, several advantages are achieved. On the one hand, the component can be produced inexpensively. Furthermore, the reflective side walls relative to the individual lenses and the lenses are firmly connected to each other, so that structural tolerances or tolerances, for example by different heat development within the luminaire, are reduced. Furthermore, it is advantageous in the present luminaire that the carrier with the LEDs is held directly on the profile ^element . The profile element may be formed in particular of aluminum and therefore effectively contribute to the cooling of the LEDs by the contact with the carrier element of the at least one LED carrier. In addition, the profile allows in a particularly simple manner, the positioning and mounting of the light-guiding elements relative to the LED cluster on the support.

According to a preferred embodiment, the light directing element is made of a two-component injection molding, wherein the lens plate are formed of a transparent material and the Be ^¬ tenwände of an at least partially reflective material. Through this manufacturing process, the light-directing component can be produced inexpensively. Further, since both components are made of plastic, they also have a similar thermal expansion.

According to a preferred embodiment, the light-guiding element has an optically transparent cover, which is connected to the edges of the side walls on the side opposite the lens plate. Also in this embodiment, the light-guiding element is integrally formed, including the transparent cover. In particular, the transparent cover may not only serve to protect the lens plate, but may also provide other light directing properties. In particular, the cover may have a prismatic structure. - or have a microlens structure, which ensures the glare of the lamp. Further, it can be provided that the transparent cover extends in the direction of the lenses ^¬ plate to sen to further influence the distribution of light. In particular, this can achieve a glare on direct view of the lamp, which is comparable in effect with a classic lighting grid.

According to a preferred embodiment, the Lichtlenkele- ment is provided with locking elements which engage the profile element to hal ^¬ tion the light-guiding element on the profile element. Preferably, the locking elements engage at one or two opposite along the profile element ersteckenden recesses. This makes it particularly easy to mount the light-deflecting element on the profile element. Since the carrier with the at least one LED cluster is likewise fastened to the profile element, the light-guiding element can thereby be easily fixed in relation to the LED cluster. According to a preferred embodiment, in particular in connection with the last-mentioned embodiment, the light-guiding element has positioning elements which interact positively with the support of at least one LED cluster. For example, one or more domes may be provided on the light-directing element, which engage in corresponding recesses on the support of the LED cluster, so that the position of the light-directing element is fixed relative to the support and thus to the LED cluster. This embodiment is particularly advantageous in connection with the previously mentioned latching elements on the light-guiding element, which engage in the profile element. For example, the latching elements can engage in a groove of the profile element, so that the light-guiding element can still be displaced along one direction in the profile element. As a result of the positive locking of the position-exponentizing element with the carrier, the position of the _ _

Defined light guide element to the LED cluster. It is advantageous that the positioning element of the light-guiding element interacts directly with the carrier in order to ensure a particularly precise positioning of the lenses relative to the LEDs in the cluster. Structural tolerances arising from the mounting of the carrier in the profile element or by the assembly of the light-guiding element on the profile element can be compensated by the positioning element which acts directly between the light-guiding element and the carrier.

Preferably, however, the light-directing element is not directly connected to the LED cluster to thermally decouple the light-directing element from the LEDs. Furthermore, an air gap between the LEDs and the lens plate offers the advantage that the light entry surface of the lenses is more effective for diffractive light steering.

According to a preferred embodiment, the carrier is formed with the at least one LED cluster as a circuit board, which mechanically holds the LED of the cluster and electrically contacted. The board also has the advantage that it is flat and therefore can be easily inserted into an undercut on the profile element. Furthermore, operating devices for operating the LEDs can be connected directly or indirectly to the printed circuit board.

According to a preferred embodiment, the carrier is inserted with the LED cluster in the profile and additionally secured with a mechanical fastener. For example, the board may be hooked on one longitudinal side in an undercut of the profile element and be screwed on the opposite ^¬ the page. The connection has the advantage that the board is in good thermal contact with the profile element, so that the profile element at the same time - -

Heat sink for the LEDs or other operating devices on the board can act.

According to a preferred embodiment, the luminaire has a plurality of the light elements and the carrier has a plurality of LED clusters. In particular, each LED cluster on the carrier is assigned a light-guiding element. It can be integrated with each other ver ^¬ also prevented several adjacent light guide elements. This embodiment is suitable for the formation of a linear luminaire. The plurality of juxtaposed light guide elements can be arranged as in the manner of a classic lighting grid in a linear luminaire.

According to a preferred embodiment, the profile element in areas in which no light-guiding elements are arranged in the profile ^¬ element, closed with non-transparent Äbdeckelemen- th. For example, on the light output

be arranged between the light guide elements cover elements in the same width as the light guide elements and the side walls can be closed with cover elements. Alternatively, the profile element itself may have the side walls of the lamp. Preferably, the end faces of the profile element are also closed by cover elements. Alternatively, connecting elements can also be present in order to connect several of the profile elements at the front, in order to form a light band from several of the entire luminaires.

The cover elements between the light-guiding elements are preferably held on the profile element. In particular, they can be slid lengthwise or plugged by hooks and / or spring elements on the profile element and locked.

According to a preferred embodiment, the profiled element is disposed on a support opposite the support of the light-guiding elements. set up facilities to install the lamp on the building side and / or has other lighting devices to produce an indirect lighting. For example, the luminaire can be constructed as a suspended luminaire. The elements for hanging are mounted on the light exit surface ge ^¬ opposite side of the luminaire. Furthermore, it is also possible to provide lighting elements on the same side which generate indirect lighting by emitting light in the direction of the ceiling. Preferably, optical elements are provided on the additional lighting elements, which provide a broad radiation, so that with the suspended lamp a ceiling can be illuminated over a larger area. Further features and advantages of the invention will become apparent from the following description of a preferred embodiment, the connection with the accompanying figures will be described. The figures show the following: FIG. 1 shows a plan view of the light exit surface of a lamp according to an embodiment.

FIG. 2 shows a cross section through the luminaire according to FIG

1 in the area of light directing elements.

Figure 3 shows a partial perspective view of the lamp of Figure 1, wherein elements of the lamp are omitted. FIG. 4 shows a cross section through the luminaire according to FIG

1 in the area of the front side.

FIG. 5 shows a cross section through the luminaire according to FIG

1 in a central region in which no light-guiding elements are arranged. - -

FIG. 6 shows a plan view of the front side of the luminaire according to FIG. 1 with additional components for indirect illumination and luminaire suspension.

Referring to Figure 1, an embodiment of the present invention will be described. The luminaire is designed as a linear luminaire, i. it has a much greater length than width. Figure 1 shows the light on the light exit side, which is intended to point in a room. The luminaire of the illustrated embodiment comprises twelve light-deflecting elements, which are arranged in two groups of six light-deflecting elements 3 in succession. Each of the light-guiding elements 3 is made in one piece. Furthermore, two or more of the adjacent light-guiding elements 3 may be fixedly connected with each other.

With reference to FIG. 2, a cross section through the luminaire according to FIG. 1 is shown. This is a profile element 1 of the lamp to see, which serves as a central holding elements for all components of the lamp. The profile element 1 is formed from an extruded profile, in particular an aluminum profile is preferred because it has the necessary stability and at the same time is a good conductor of heat, so that it can also serve as a heat sink for the lamps and equipment of the lamp.

The profile element 1 has on one side continuous hooks la, which serve to receive the light-guiding elements 3, which in turn have locking elements 3a on the side surfaces. The latching elements 3a on the light-guiding elements can be designed to be elastic, for example, of plastic, so that they can simply be placed under elastic deformation on the hooks la of the profile element 1 from below and engage behind the hook 1a. Furthermore, on the profile element 1 a carrier ger 2 for LED cluster, which is formed in the illustrated Ausfüh ^¬ tion form by a board 2 attached. The board 2 is flat and extends at least over the Län ^¬ ge of the adjacent light-guiding elements 3. It is inserted on a longitudinal side 2a in a continuous projection lb of the profile element 1 and secured on the opposite longitudinal ^¬ side by a plurality of screws 2b. As a result, the board 2 is flat against the profile element 1, so that a good thermal contact between the board 2 and the profile element 1 is ensured. If, according to preferred embodiments, the printed circuit board 2 also has printed conductors on the side facing the profiled element 1, these are electrically insulated from the metal profiled element 1 by an insulating layer.

On the side facing the light-guiding element 3, the board 2 has clusters of LEDs 2d which serve as light-emitting means in the luminaire for generating direct illumination. With reference to FIG. 3, the clusters of LEDs 2d can be seen in the top view. They form a two-dimensional array of LEDs, each associated with a light-guiding element 3. The light-guiding element 3 has a transparent lens plate on the side facing the LED cluster 2d (only the circumference of the lens plate is shown in FIG. 3 for clarity). The lens plate has a continuous arrangement of a plurality of lenses, which may be formed, for example, as collecting, scatter or free-form lenses. Each individual LED 2d in the LED cluster is in each case assigned a lens, so that the light from the LED strikes, at least for the most part, the lens assigned to it. The lenses are preferably equipped in such a way that they concentrate the light of the LED 2d and thereby emit mainly in a direction perpendicular to the light exit surface of the light. The light guide member 3 further has side walls 3a extending laterally from the edges of the lens plate toward the light exit surface. The lens plate and the side walls 3a are integrally formed with a two-component plastic injection molding method. In this case, the plastic which forms the lens plate, transparent to produce the optical properties for the lenses. The plastic material for the side walls 3a is at least partially light-reflecting, so that the side walls can act as reflectors on the side facing the LEDs 2d. Light of the LED 2d, which is not directed to the light exit side of the light guide elements 3 after penetrating the lens plate, is reflected on the side walls 3a to also leave the light guide element from the light exit surface.

Two or more of the light-guiding elements 3 can be connected to one another on one side, as shown in FIG. Further, in this area of the light-guiding elements 3, at least one dome 3b is provided on the light-guiding element 3, which engages in a recess of the board 2. As a result, the light-guiding element and in particular the lens plate is aligned with respect to the board 2 or the clusters of LEDs 2 d arranged thereon. The mechanical support of the light-guiding element 3 in the luminaire, on the other hand, is ensured by the latching elements 3a, which latch onto the hanks of the profile element 1. By the pin 3b, a precise alignment of the light-guiding element with respect to the board can be ensured, while they act directly between the board and the light-directing elements. Even if the profile element 1 changes in length due to thermal expansion with respect to the board 2 or the light-guiding elements 3, the light-guiding element 3 thereby still remains correctly aligned above the LEDs 2d. The light guide element 3 (not constitute ^¬ provided in the figures), a cover aufwei ^¬ sen, in particular consisting of plastic cover which is welded integrally with the side walls 3a of the light guide element 3 on the light exit side further. The art fabric cover is transparent and preferably has a micro-prism structure, which can provide for further light control, in particular for a diffuse scattering to glare. Furthermore, it is preferred that the transparent cover in the light-guiding element 3 has a depression in the direction of the lens plate or the LEDs 2d, whereby a further light deflection is produced for glare-freeing of the luminaire. Further details with regard to the transparent cover are described in patent application DE 10 2016 101 345, the disclosure of which is incorporated herein by reference for further details on the transparent cover.

Referring to Figure 4, which shows the cross section through the lamp described above in an area further on one of the front side, hereinafter a non-transparent cover 4 of the lamp, the side walls, the narrow areas between the light guide elements 3 and the front of the Close the light, described. The non-transparent cover 4 has a frame-like underside, whose openings form the light exit side of the light-guiding elements. Furthermore, the cover 4 extends over the side walls of the lamp and over the front side

(The latter is not shown in the figure). One of the side walls of the cover 4 (on the left side in FIG. 4) has on the inside a projection 4a which bears against a projection of the hook 1a of the profile element. On the opposite side wall, a spring element 4b is integrated in the cover 4, which engages for the corresponding projection on the opposite side. Thereby _ ₁ _ _χ the cover 4 from the bottom just above the Lichtlenkele ^¬ elements 4 can be plugged onto the light and locked in the profile ^¬ element. 1 Figure 5 shows a cross section through the previously be ^¬ prescribed light in the central portion, in which are arranged kei ^¬ ne light guide elements. 3 In this area of the lamp electrical operating devices 2 c (shown schematically in Figure 5) are arranged and electrically connected to the circuit board 2. Furthermore, a ^{further ¬} re non-transparent cover 4 ^{λ is} provided in this area, which covers the bottom of the lamp. The cover 4 ^λ is like the cover 4 formed of a non-transparent plastic material. The cover 4 ¹¹ is attached to angle 4'a, which are connected to the profile element 1. Alternatively, it can also be provided that the cover 4 and the cover 4 ^{Λ are formed} from a continuous component.

FIG. 6 shows the above-described luminaire from one end face in the plan view, wherein further components are shown

Top are provided. On the profile element 1 are on the board 2 opposite side further Beleuchtungsmit ^¬ tel 5, preferably also LEDs, provided, which are directed in Rich ^¬ tion to the ceiling to provide for indirect lighting. Further, a lens element 5a on the LED 5 on projections of the profile element 1 lengthwise over the lamp is provided, and the light of LEDs 5 for the Indi ^¬ rektbeleuchtung is to deflect. Further details on the Indirektbe ^¬ illumination are written in the patent application DE 10 2016 101 361 loading, whose disclosure is incorporated with respect to the details of the indirect lighting herein by reference.

Furthermore, it is shown in FIG. 6 how the luminaire is mounted on the room side. At the profile element 1 are behind projections several ironing elements 6 (in Figure 6, only one to see) up- _ ₂ _ pushed. On the bracket member 6, a Seilversteller 7 is mounted centrally, to which a suspension cable 7a is attached, on which the lamp is kept at a distance from the ceiling. Further modifications of the luminaire are possible within the scope of the invention, which is defined by the claims. In particular, a different number of light-guiding elements may be provided in the luminaire. The lamp, as shown in Figure 1, may have more or fewer light-guiding elements in a row. Preferably, at least two Lichtlenkele- elements are present in a lamp. Furthermore, the luminaire does not have to be designed as a single luminaire. It can be provided instead of the end-side covers and a connecting element (preferably attached to the profile element 1) to connect a plurality of lights to form a light band in a row. It is also possible to provide corner elements which have, for example, one or more of the light-guiding elements 3, in which case the light-guiding elements 3 can be arranged not only one behind the other but also at an angle of, for example, 90 ° to one another. In other embodiments, it is also possible to provide light-guiding elements next to one another and behind one another, for example in several columns.

Beings list of characters.

1 profile element

la hook

lb projection

2 carriers, iris-specific circuit board

2a Long side of the board

2b fastening element, in particular screw 2c operating device

2d LED of the LED cluster

3 light guide element

3a locking element

3b positioning element, in particular Dom 3c reflective side wall

4 non-transparent cover

4a projection

4b spring element

4 ^Λ non-transparent cover

4'a bracket

5 LEDs for indirect lighting

5a Freeform lens for indirect lighting

6 stirrup element

7 rope adjusters

7a rope

Claims

Luminaire comprising:

a profile element (1),

a carrier (2) with at least one LED cluster (2d), which is held on the profile element (1), and

at least one light-guiding element (3) with a Linsenplat ^¬ te overlying the LED cluster (2d) is arranged, and with reflective side walls (3a) which are integrally connected to the lens plate and extending oppositely from the edges of the lens plate in one direction extend to the LED cluster (2d),

wherein the light guide member (3) is held on the profile member (1) so that the lens plate is positioned above the LED cluster (2d).

Lamp formed according to claim 1, wherein the light-guiding element (3) is made of a two-component injection molding, wherein the lens plate of a transparent material and the side walls (3a) of an at least partially reflec ^¬ leaders material.

Luminaire according to one of the preceding claims, wherein the light-guiding element (3) has an optically transparent cover which is connected to the edges of the side walls (3a) on the side opposite the lens plate.

Luminaire according to claim 3, wherein the transparent cover has a microlens structure and / or a prism structure.

Luminaire according to one of the preceding claims, wherein the light-guiding element (3) is provided with latching elements (3a), - lb - which engage on the profile element to hold the Lichtlenkele- element (3) on the profile element (1).

Light according to one of the preceding claims, wherein the light directing element (3) has a positioning member (3b) on ^¬ which positively connected to the carrier (2) of the LED cluster (2d) co-operates to the light-guiding element (3) in the position opposite to the Align LED cluster (2d).

Luminaire according to one of the preceding claims, wherein the carrier (2) with the at least one LED cluster (2d) is formed as a circuit board, which mechanically holds the LED of the cluster and electrically contacted.

Luminaire according to one of the preceding claims, wherein the carrier (2) with the LED cluster (2d) is inserted into the profile element (1) and secured with additional mechanical fastening elemerite (2b).

Luminaire according to one of the preceding claims, wherein the luminaire has a plurality of the light-guiding elements (3) and the carrier (2) has a plurality of LED clusters (2d).

Luminaire according to claim 9, wherein the plurality of Lichtlenkele elements (3) arranged in a row along the profile element (1) above the carrier (2) with a plurality of LED clusters s ind.

Luminaire according to one of the preceding claims, wherein the profile element (1) in areas where no light-guiding elements (31) on the profile element (1) are arranged, with non-transparent cover (4, 4 ^λ ) is closed.

12. Luminaire according to claim 11, wherein the non-transparent cover elements (4) with latching elements (4a, 4b) are held on the profile element. 13. Luminaire according to one of the preceding claims, wherein the profile element (1) on a support (2) opposite side facilities to mount the light side building and / or further lighting devices to produce an indirect lighting.