DE102012102973A1 - Luminaire with integrated heat sink - Google Patents

Abstract

The invention relates to a luminaire, in particular floor lamp or pendant luminaire, which has two light exit surfaces on two opposite sides of a lamp housing to emit light for direct lighting and for indirect lighting, wherein lighting means in the form of LEDs for generating the direct lighting and the indirect lighting in thermal contact with the lamp housing are arranged in this, and wherein the lamp housing is formed as an integral body of a solid thermally conductive material having a specific thermal conductivity of more than 30 W / Km, preferably more than 100 W / Km and which has on portions of its surface cooling fins.

Description

The present invention relates to lights, in particular interior lights, which emit a portion of light for direct lighting of the room down and a proportion of light for indirect lighting of the room upwards. Such light are designed for example as floor or pendant lights.

A lamp of the type mentioned is, for example, in DE 10 2010 003 751 U1 disclosed. As light source for the indirect component LEDs are used. For cooling the LEDs, a plurality of heat sinks are provided in the luminaire housing. The direct portion of the light is generated by conventional fluorescent tubes.

The integration of heat sinks for cooling the LEDs, which heat up during operation, is relatively expensive in these luminaires. In particular, in a flat lighting design, which is desirable for floor and pendant lights, often not enough space for heatsink to form all bulbs as LEDs can.

Object of the present invention is to improve the cooling options constructively for a lamp of the type mentioned with LEDs as bulbs.

The object is achieved by a lamp, in particular floor lamp or pendant lamp, which has two light exit surfaces on opposite sides of a lamp housing to emit light for direct lighting and indirect lighting, with light sources in the form of LEDs for generating direct lighting and indirect lighting in thermal contact with the Luminaire housing are arranged in this, and wherein the lamp housing is formed as an integral body of a solid thermally conductive material having a specific thermal conductivity of more than 30 W / Km, preferably more than 100 W / Km and which has on portions of its surface cooling fins.

In the luminaire according to the invention, the entire housing is used as a large heat sink, to which the LEDs are thermally coupled directly or indirectly. This also provides a relatively flat housing, as is desirable for interior lighting of the type mentioned, enough space available to form a large-sized heat sink, which also makes it possible, all lamps in the lamp, d. H. for both the direct and the indirect component, as LEDs.

Furthermore, the integration of the heat sink with the luminaire housing substantially simplifies the design of the prior art. The lighting structure is simpler, because separate frame and fasteners for attaching the heat sink omitted in a housing.

According to a preferred embodiment, the housing is formed of an aluminum die-cast. Aluminum has a very high specific thermal conductivity with comparably low weight. Therefore, this material is particularly suitable for the formation of the housing with integrated heat sink according to the present invention.

According to a preferred embodiment, the cooling fins are arranged on two opposite sides of the lamp housing. The cooling fins can each be arranged next to one of the light exit surfaces for indirect or direct lighting. By using both sides of the luminaire is a sufficient surface available to accommodate the necessary number of cooling fins for cooling. Furthermore, the surface of the housing without cooling fins also contributes to the cooling.

According to a preferred embodiment, the light exit surfaces for the direct and indirect illumination on the two opposite sides of the housing are arranged offset to one another. On the one hand, this allows a flat luminaire design and, on the other hand, it still allows enough space to accommodate cooling fins next to the light exit surfaces.

According to a preferred embodiment, the LEDs for the direct and / or indirect lighting are each arranged on boards, which are fastened in direct thermal contact with the lamp housing at this. The boards can lie flat against the housing or be integrated in recesses of the housing. Optionally, reflectors are provided in recesses of the housing to redirect the light of the LEDs in the desired direction to the light exit surface of the indirect or direct light component.

According to a preferred embodiment, the LEDs for the direct and indirect lighting are arranged offset from one another in a vertical section (eg parallel to a lamp post or a pendulum suspension) of the luminaire. Thereby, the heat input is distributed in the housing designed as a heat sink and there is enough space on the opposite side of the LEDs to the housing for the arrangement of the cooling fins available.

According to a preferred embodiment, the LEDs for the direct and / or indirect component are each arranged in a recess of the housing. The light exit surface may be formed by the outer edge of the recess and is preferably provided with a transparent cover to form the lamp dust, moisture or even jet water protected.

According to a preferred embodiment, the LEDs are associated with reflectors individually or in groups. For example, the LEDs may be arranged on a planar board in rows and columns, wherein the LEDs individually or a group of adjacent LEDs each having a reflector segment is associated, which has reflection surfaces arranged in the manner of a funnel around the LEDs or the group of LEDs are. The reflection surfaces can be designed to focus or widen the light radiation emitted by the LEDs. Alternatively, an LED group can be assigned to a larger LED reflector, which provides the entire proportion of indirect or direct lighting. In this case, the LEDs can also be arranged on a circuit board, which is arranged vertically to the light exit surface of the indirect light component or direct light component. The light is deflected by a preferably flat reflector with several facets, which extends to the light exit surface of the indirect light component or the direct light component.

According to a preferred embodiment, the lamp is designed as a floor lamp and the housing has a receptacle for a lamppost. In particular, a snap-in and / or plug-in connection between the lamp and the lamppost is preferred because this allows the lamp to be easily assembled during installation on site. In the area of the mast receptacle, an opening can also be provided in the luminaire housing in order to lay a through-wiring from the mast into the luminaire housing.

According to a preferred embodiment, the mast support is approximately in the center of gravity of the housing, d. H. not more than about 200 mm from the center of gravity. In this way, the luminaire housing can be stably stored even at relatively high weight on a single mast.

According to a preferred embodiment, the LEDs are the direct illumination on a planar board, on which the LEDs are provided in a plurality of rows and columns, wherein the board rests on ribs of the housing. The ribs preferably extend parallel to the rows or columns of the LEDs in order to ensure a uniform thermal coupling of the LEDs to the housing acting as a heat sink.

According to a preferred embodiment, the LEDs in the direct lighting and / or indirect lighting can each be combined together on a board with a, preferably segmented, reflector assembly in a module which is inserted into the luminaire housing. The structure with an integrated module facilitates the installation of the luminaire. Furthermore, it is possible to provide different modules within the same luminaire series for different light distributions of the luminaire.

Other features and advantages of the present invention will become apparent from the following description of a preferred embodiment taken in conjunction with the accompanying drawings. The figures show the following:

1 shows a perspective view of a floor lamp on the light exit side of the direct lighting.

2 shows a perspective view of the light after 1 on the light exit surface of the indirect lighting.

3 shows a perspective view of the lamp housing as a single component on the light exit side of the direct lighting.

4 shows a section of the luminaire housing as a single component in the region of the light exit surface of the indirect lighting.

5 shows a cross section through the lamp along the line 5-5 in 3 with mounted LED board and reflector assembly.

6 shows a cross section through the lamp along the line 6-6 in 5 ,

7 shows a cross section through the lamp along the line 7-7 in 5 ,

Referring to the 1 and 2 is a perspective view of a floor lamp according to an embodiment of the present invention shown. The luminaire has a light exit surface on the underside 2 on to provide light for the direct lighting of a room, and on the top of a light exit surface 4 on to provide for indirect lighting to the ceiling.

The housing 6 the lamp is designed as an integral light housing, which in a perspective view of the light exit side 2 here Seen as a single component without electrical equipment and other attachments in 3 is shown. The housing 6 is made of a solid die-cast aluminum. The housing 6 integrates two functions of the luminaire into one element. On the one hand, it provides a receptive surface and protects various lighting components, in particular the light sources and the reflectors. On the other hand, it also represents the heat sink of the lamp. These are on the lamp housing 6 on two sides cooling fins 8th and 10 intended.

The luminaire housing can, as in 1 shown a cover 12 exhibit. However, this is in the field of cooling fins 8th cut out to allow cooling by air convection. There are also cutouts in the cover 12 in the area of the light exit surface 2 to extract the light from the housing.

Referring to 3 is in the area of the light exit surface of the direct lighting (in the 1 with reference number 2 shown) to recognize a flat depression on the bottom of several ribs 14 are arranged. In this area of the housing, a luminaire module which comprises a circuit board with LEDs and a reflector assembly is arranged. In 5 is a cross section through the lamp along the line 5-5 in 3 shown, wherein the lamp module is mounted. The module comprises a flat board 16 , on which in several rows the LEDs 18 the direct lighting are arranged. As in the section according to 7 is shown, each is a series of LEDs 18 on the board 16 along a rib 14 of the luminaire housing 6 arranged. This provides a good thermal connection between the LEDs 18 and the housing acting as a heat sink 6 guaranteed. The board 16 forms together with a reflector assembly 20 a luminaire module, which by means of the cover 12 on the housing 6 is attached by a latching connection.

The reflector assembly 20 has a plurality of approximately funnel-shaped individual reflectors, each one of the LEDs 18 assigned.

In an area next to the light exit surface 2 for the direct portion of the lighting are on the opposite side of the housing 6 the lighting devices provided for the Indirektlichtlichtanteil. Referring to the 2 and 4 you can see that the luminaire housing 6 on the top has a recess with a horizontal side wall. On the sidewall is a disc 24 with several LEDs (not shown separately in the figures) arranged. The light of the LEDs on the disc 24 is a segmented, asymmetrically shaped reflector 26 towards the light exit surface 4 diverted. In the 4 is the recess in the housing 6 in the area of the light exit surface 4 without the reflector 26 and the LED disc 24 to see.

In the recess for the internals of indirect lighting, as in 4 is an opening 28 to see in the luminaire housing, which is a connection from the top of the lamp to a range of mast support 32 forms. Through this opening 28 can be a wiring for making electrical contact with the LED panel 24 be moved.

In addition to the light exit surface 4 are also on the top of the housing cooling fins 10 intended. These work together with the cooling fins 8th on the bottom to the LEDs on the disc 24 and on the board 16 to cool. Because of the case 6 is integrally formed of die-cast aluminum, all with the housing 6 connected thermally-connecting components thermally, so that the heat can be dissipated through the large surface.

It should be noted that not only the cooling fins 8th and 10 are responsible for the cooling, but that also the large surface areas on the top of the lamp opposite the light exit surface 2 contribute to cooling.

As in the 1 and 2 is shown on the underside of the lamp housing 6 a lamppost 36 appropriate. The lamppost 36 is by means of a snap-in connection with the housing 6 connected. In the 3 . 5 and 6 the housing-side connector without mast can be seen. The catch / plug connection 32 includes four pens 34 , each with a corner of the mast 36 , which is designed as a square tube form a positive connection to this. Furthermore, the latching / plug connection comprises 32 two opposite wing elements 35 attached to two side surfaces of the mast 36 on the inside. The weight of the case 6 can alone by the plug connection between the mast and the mast holder 32 be worn. This is the entire mast intake 32 arranged in the horizontal plane approximately in the center of gravity of the housing, so that the forces acting on the connection through the housing weight tilting forces are minimized. The mast intake 32 According to the illustrated embodiment, about 100 mm apart from the center of gravity of the housing is displaced in the direction of the indirect illumination. Preferably, the mast receptacle is no more than about 200 mm from the center of gravity in a horizontal section of the luminaire.

Numerous variations of the preferred embodiments described above are possible within the scope of the invention as defined in the claims. In particular, embodiments of the luminaire according to the invention can also be designed as a pendant light for hanging from a ceiling. There may be a plurality of light exit surfaces for direct lighting or indirect lighting, wherein all the light emitting surfaces associated LEDs are inventively thermally coupled to the one integral housing.

LIST OF REFERENCE NUMBERS

2

Light exit surface for direct lighting

4

Light exit surface for indirect lighting

6

casing

8th

cooling fins

10

cooling fins

12

cover

14

rib

16

circuit board

18

LED

20

reflector

24

LED disc

26

reflector

28

opening

32

pole diameter

34

pen

35

wing element

36

mast

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102010003751 U1 [0002]

Claims (13)

Luminaire, in particular floor lamp or pendant luminaire, which has two light exit surfaces ( 2 ; 4 ) on two opposite sides of a luminaire housing ( 6 ) to emit light for direct illumination and for indirect illumination, wherein light sources in the form of LEDs ( 18 ; 24 ) for producing the direct illumination and the indirect illumination in thermal contact with the luminaire housing ( 6 ) are arranged in this, and wherein the luminaire housing ( 6 ) is formed as an integral body of a solid thermally conductive material having a specific thermal conductivity of more than 30 W / Km, preferably more than 100 W / Km and which on portions of its surface cooling fins ( 8th ; 10 ) having. Luminaire according to claim 1, wherein the luminaire housing ( 6 ) is formed of an aluminum die-cast. Luminaire according to one of the preceding claims, wherein the cooling fins ( 8th ; 10 ) on the two opposite sides of the luminaire housing ( 6 ) are arranged. Luminaire according to one of the preceding claims, wherein the light exit surfaces ( 2 ; 4 ) are offset on the two opposite sides offset from one another. Luminaires according to one of the preceding claims, wherein the cooling ribs ( 8th ) are arranged at least on the light exit surface for the indirect lighting opposite portion of the lamp housing on the side of the lamp housing with the light exit surface for direct lighting. Luminaire according to one of the preceding claims, wherein the LEDs ( 18 ) for direct and / or indirect lighting on circuit boards ( 16 ; 24 ) which are in direct thermal contact with the luminaire housing ( 6 ) are attached to this. Luminaire according to one of the preceding claims, wherein the LEDs ( 18 ; 24 ) are arranged offset to each other for the direct and indirect lighting in a vertical section through the lamp. Luminaire according to one of the preceding claims, wherein the LEDs ( 18 ; 24 ) are arranged for direct and / or indirect lighting in each case in a recess of the lamp housing. Luminaire according to one of the preceding claims, wherein at least some of the LEDs ( 18 ; 24 ) single or groupwise reflectors ( 20 ; 26 ) assigned. Luminaire according to one of the preceding claims, which is designed as a floor lamp, wherein the luminaire housing a receptacle ( 32 ), in particular a receptacle with a latching and / or plug-in connection, for a lamppost ( 36 ) having. Luminaire according to claim 10, wherein the mast holder ( 32 ) is arranged with respect to a horizontal section through the lamp in the region of the center of gravity of the lamp housing or not more than 200 mm away from it. Luminaire according to one of the preceding claims, wherein the LEDs ( 18 ) for direct lighting on a flat board ( 16 ) are arranged in several rows and the board ( 16 ) on several ribs ( 14 ) of the luminaire housing ( 6 ) rests, wherein the ribs ( 14 ) along the LED rows. Luminaire according to one of the preceding claims, wherein the LEDs ( 18 ) of the direct lighting and / or the indirect lighting on a, preferably flat, board ( 16 ) with a segmented reflector assembly ( 20 ) is summarized in a module which is inserted into the luminaire housing.

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