EP2023035B1 - Luminaire - Google Patents

Abstract

The luminaire has several LEDs that are arranged on a heat conducting LED carrier (6), and flat frame (5) made of heat conducting material that is connected to the carrier. The flat frame made of light permeable material is formed on outer periphery of main lighting surface (3) comprising a plastic plate. The light emitted from the LEDs is irradiated on a reflector arranged opposite to the main lighting surface.

Description

The invention relates to a luminaire according to the preamble of patent claim 1.

In the document WO 2007/054889 A a luminaire is disclosed with a pot-shaped housing for receiving electrical components and for detachable mounting a functional unit having a main luminescent surface, wherein the main luminescent surface of the functional unit is parallel to the bottom wall of the housing and located in the functional unit LEDs on a between the bottom wall of the housing and the main illuminated surface arranged reflector are directed, so that the main illuminated surface is exposed to diffuse light.

From the US Pat. No. 6,840,652 B1 a luminaire is known, are arranged at the edge arranged LED's against a arranged at the bottom of the housing reflector over which a main luminescent surface is exposed to reflection light.

From the US 2005/0219860 A1 a flat lamp is known, which consists of a closed profile frame, wherein a surface enclosed by this frame surface as a reflective surface and the opposite surface enclosed by the frame is designed as a transparent surface. In the middle region between these two surfaces LED's are provided in corresponding recesses of the frame, which act on the reflection surface and the light-transmitting surface with light.

The object of the invention is to design a luminaire of the type specified in such a way that it can be used both for indoor and outdoor, can be designed as a pure LED light with surface light output and ensures the best possible heat dissipation.

This problem is solved according to the invention essentially by the features of patent claim 1.

Through these features, a luminaire possessing the character of a flat screen in terms of aesthetics is provided with uniformly illuminated main light surface with uniformly diffused light and, thus, not lying in the direct light region, with uniformly diffuse backlit main luminous surface which, depending on the each used LED bulbs have a monochromatic light color, but can also deliver dynamic RGB light.

It is particularly advantageous that the circumferential flat frame made of thermally conductive material is used as a cooling surface and effectively dissipates the heat generated within the lamp to the outside.

Preferably, the flat frame forms both the visible side edge outer boundary of the main luminescent surface as well as the functional unit, whereby the light contrast is increased and the luminaire with sharp outlines in appearance occurs, so that aesthetically the impression of a framed light surface arises.

The functional unit supporting the flat frame is designed as a translucent body, in particular as an opal glass body or as a translucent plastic body of one or more parts, in which the flat frame is inserted flush and connected to the likewise thermally conductive LED carriers via thermally conductive elements passing through the wall of the functional unit is.

Due to the design of the functional unit in the form of a translucent body, it is possible to provide in addition to the main luminescent surface on the reflector and / or directly exposed to light side luminescent surfaces between the flat frame and the housing, the side luminescent surfaces can also be associated with partial reflector surfaces of angled Edge regions of the concave curved and fully illuminated LED reflector are formed.

By this configuration, a polygonal, in particular rectangular, square or round light body can be created, the clear has limited diffuse light surfaces, wherein the actual light sources do not appear, but are arranged concealed throughout.

A particularly advantageous embodiment of the invention, which likewise has the advantages already explained above, is distinguished by the fact that the functional unit is designed as a space body which widens on all sides starting from the flat-top-shaped housing and has a base section which can be coupled to the housing and an adjoining and widening one Inclined surface portion which merges into an edge portion which is formed as a support for the main luminous surface and the flat frame.

In particular, when the angle between the bottom wall of the housing and the inclined surface portions is selected to be significantly less than 45 °, resulting in this way for the light aesthetically the desired character of a flat screen.

To increase the luminous efficacy compared to an existing example of opal glass or plastic material corresponding functional unit is provided according to a further embodiment of the invention for the main luminescent surface provided with a microprismatic plastic plate, which is preferably prism side covered with a glass plate and back with a light-diffusing film. The plate-shaped main luminous surface can be combined with the flat frame to form a unit and connected to the end region of the functional unit via a peripheral edge bent at right angles, in particular welded or glued.

In the flat screen-shaped embodiment variant of the invention, a divider wall-forming, preferably flat, reflector is preferably arranged between the base section and the inclined surface section. The walls of the inclined surface portion may be made translucent, but it is also possible to make the inner walls of the inclined surface portion reflective.

In order to ensure an optically virtually no appearance emerging power supply of the LED units despite the reflector surface forming a partition wall, is provided in this embodiment, that the necessary lead wires extend in the fold edges between adjacent inclined wall partial surfaces. In order to ensure a trouble-free installation, these wires are connected to the LED groups each via a contact surface on the LED carrier attacking spring contact, so that the electrical connections are inevitably made when the unit of main luminescent surface, flat frame and LED carriers placed on the free edge portion of the lamp body and connected thereto.

Further advantageous features and embodiments of the invention are specified in the subclaims.

Fig. 1

eine schematische Schnittansicht zur Erläuterung einer nach Art eines Lichtkörpers ausgebildeten Ausführungsform der Erfindung,

Fig. 2

eine perspektivisch dargestellte Schnittansicht einer nach Art eines Flachbildschirms gestalteten Ausführungsform der Erfindung,

Fig. 3

eine perspektivische Teildarstellung zur Erläuterung einer verwendbaren elektrischen Anschlusstechnik der LED-Einheiten, und

Fig. 4

eine perspektivische Schrägansicht einer Ausführungsform der Erfindung in Rechteck-Ausgestaltung.

Embodiments of the invention will be explained with reference to the drawing; in this show:

Fig. 1

FIG. 2 is a schematic sectional view for explaining an embodiment of the invention in the manner of a light body. FIG.

Fig. 2

3 shows a perspective sectional view of a flat-panel type embodiment of the invention;

Fig. 3

a partial perspective view for explaining a usable electrical connection technology of the LED units, and

Fig. 4

a perspective oblique view of an embodiment of the invention in a rectangular configuration.

To Fig. 1 the luminaire comprises a flat-top-shaped housing 1 and a functional unit 2 which can be coupled and connected to the housing 1 and which is formed by a shaped body made of light-permeable material.

The functional unit 2 defines together with the housing 1 a flat interior, in which there is a concave reflector 10 with respect to the main surface 3, which is supported in the housing 1 and extends with its lowest point to the vicinity of the bottom wall 4 of the housing and In the region of its upper and its lower edge, an edge region which is obtusely bent in the direction of the housing and which forms a partial reflector surface 9 in each case.

The translucent material consisting of functional unit 2 with flat main luminescent surface 3 carries a peripheral flat frame 5 made of opaque and especially heat-conducting material, which limits the main luminescent surface 3 on the one hand and on the other flush with the side wall of the functional unit 2.

Located in the interior of the functional unit 2 and the rear side below the flat frame 5, an LED support 6 is provided, which consists of thermally conductive material and also thermally conductive, preferably integrally molded fixing strips 6 'and the translucent material of the functional unit 2 passing through connecting elements 12 with the flat frame. 5 connected is.

The laterally connected to the LED support 6 fixing strips 6 extend below the flat frame 5 adjacent to the inside of the main luminescent surface 3 and are fixed on the flat frame 5 provided on the inside, peg-shaped connecting elements 12 and heat-conducting connected to the flat frame 5.

The LED carrier 6 can be adjusted in particular by a simple bending process relative to its fixing strips 6 'in its inclination with respect to the main luminescent surface 3, so that the arranged on a particular reflective surface 8 of the support 6 LED's with respect to the concave reflector 10 optimally - Considering the LED's preferably associated optics - can be directed and thereby the reflector 10 at least from one side and preferably from both sides applied uniformly with light and the desired full surface diffuse backlit main luminescent surface 3 is obtained.

The LEDs whose monochromatic light color can be predetermined are preferably positioned such that part of the light emitted by them also strikes the partial reflector surfaces 9 and is reflected from there to the side walls of the functional unit. Since these side walls are transparent, arise in this way side light surfaces 11, which are advantageous in an embodiment as surface mounted or semi-recessed lights in appearance.

Fig. 2 shows a preferred embodiment of the invention, which is designed in terms of their spatial design in the manner of a flat screen.

In this embodiment, the flat-top-shaped housing 1 can be coupled via flush-mounted snap-action clamping elements 18 with a widening spatial body, which is formed by a base portion 13 and an adjoining, on all sides widening inclined surface portion 14, which merges into an edge portion 15, which serves as a carrier for the main luminescent surface 3 and the flat frame 5 is formed. The snap-action clamping elements or clip clamping closures 18 can be blocked by means of a securing screw 19.

The arrangement of the light emitting diodes below the flat frame 5 and the dissipation of the heat generated by the LED's to the flat frame 5 is analogous to the embodiment according to Fig. 1 designed. Instead of a concave curved reflector, as in the embodiment according to Fig. 1 is provided according to Fig. 2 a arranged between the base portion 13 and the inclined surface portion 14 and at the same time a partition forming reflector 16 is used, which is preferably flat. The inclined surfaces 14 are usually translucent, but their inner wall sides can also be designed to be reflective and form a total reflector with the flat reflector 16, which reflects the light emitted by the concealed "LEDs" on this total reflector diffuse light to Hauptleuchtfläche 13 and their largely uniform application ensures with reflection light.

In order to ensure the highest possible luminous efficacy, one with a microprism structure is preferred for realizing the main luminous surface 3 provided plastic plate used, which is preferably prism side covered with a glass plate and back with a light-diffusing film. This structure is combined with the flat frame 5 to a unit and preferably glued or welded to the edge portion 15.

In order to achieve that light is also applied to the wall-side area located behind the mounted luminaire when the luminaire is viewed from the front, it is provided according to a preferred embodiment that at least the edge section 15 running perpendicular to the main luminous surface 3 is designed to be translucent.

In the area below the planar reflector 16 are the units required for powering the LED's. The electrical connection between these power supply units and the LEDs is preferably via electrical conductors which are guided along the bending edges 17 between adjacent inclined surfaces. In this way, these electrical conductors do not appear visually disturbing.

Fig. 3 shows a portion of a lamp according to the invention for explaining the contacting of the LED units. In this illustration, the reflector surface 16 separating the upper region of the luminaire and the housing-side region of the luminaire is not shown, but the support edges for this reflector surface can be seen on the step-shaped transitional region between the base section 13 and the end section engaging in the housing 1. The respective electrical conductor 21, which is connected via a plug connection 22 to the power supply, runs in bending edges 17 and ends in a spring contact 25 in the region of the LED carrier 6. At the LED carrier 6, a contact surface 24 is provided opposite the spring contact 25. at the spring contact 25th is applied when the unit of main luminous surface 3, 5 flat frame and LED support 6 with associated fixing strips 6 'is connected to the edge portion 15.

The contact surface 24 is in electrical communication with the LEDs 20, i. Each group of LED's 20 is connected via two contact surfaces 24 to the power supply.

The representation after Fig. 3 also shows the configuration of the lateral fixing strips 6 ', which are provided with holes 23 through which extend in the assembled state, the connecting elements 12 which are provided on the flat frame 5. It can also be seen that the LED support 6 can be changed in terms of its angular position to the fixing strips 6 'by a bending operation, wherein the electrical contact between the spring contact 25 and the contact surface 24 remains unchanged.

Each of the two mutually opposite provided LED support 6 extends over the length of a rectangular side and has at both ends in each case a contact surface 24. The two, each LED carrier 6 associated and perpendicular to the carrier 6 extending fixing strips 6 'each extend to the middle of the relevant side of the rectangle.

The perspective view after Fig. 4 shows a preferred embodiment of a square or square structure having lamp according to the invention. The housing 1 is connected to the functional unit 2 via clip clamping closures 18, so that after production of the electrical connections in the region of the housing 1 including in Fig. 3 shown connector 22, the functional unit 2 set only on the housing 1 and must be coupled by means of snap connections 18 with the housing.

The Fig. 4 also makes it clear that the LED units are practically invisible and also the leading to these units in the four bending edges 17 electrical conductors 21 are not disturbing in appearance. Over the large-area reflector 16, a full-surface and extremely uniform application of the main luminous surface is achieved, and it can be additionally ensured that the respective desired lateral light emission via the edge portions 15, not shown in this representation oblique surface portions 14 and the base portions 13.

The main luminescent surface 3 may carry pictograms or other characteristics, such as house numbers, with these characteristics appear particularly clearly due to the uniformly diffuse backlighting. This application is an example of the many uses of the invention, especially designed in the manner of a flat screen light.

LIST OF REFERENCE NUMBERS

1

casing

2

functional unit

3

Main lighting surface

4

bottom wall

5

flat frame

6

LED support

6 '

Fixing strips of the LED carrier

7

LED

8th

support surface

9

Part reflector surface

10

concave reflector

11

Page luminous area

12

connecting element

13

base section

14

Sloping segment

15

edge section

16

reflector

17

bend edge

18

Snap clamping elements

19

locking screw

20

LED

21

electrical conductors

22

connector

23

drilling

24

contact area

25

spring contact

Claims (20)

1. A luminaire with a pot-shaped housing (1) for the reception of electrical components and for the releasable mounting of a functional unit (2) having at least one light permeable main lighting surface (3) and LEDs (7), wherein the essentially planar main lighting surface (3) of the functional unit (2) extends parallel to the base wall (4) of the housing (1) or its mounting surface and the LEDs (7) are directed to a reflector (10) arranged between the base wall (4) of the housing (1) and the main lighting surface (3),
   characterized in that
   the main lighting surface (3) is bounded at the rim side by a peripheral flat frame (5) made of heat conducting material and side lighting surfaces (11) illuminated by light are provided between the flat frame (5) and the housing (1) in addition to the main lighting surface (3);
   in that the LEDs (7) are attached to at least one heat conducting carrier (6, 6');
   in that the flat frame (5) is connected in a heat conducting manner to at least one LED carrier (6, 6') which is located in the functional unit (2) in the region of the rear side of the flat frame (5) and whose surface (8) carrying the LEDs (7) is directed toward the reflector (10) such that the main lighting surface (3) is illuminated substantially uniformly by diffuse light.
2. A luminaire in accordance with claim 1, characterized in that the flat frame (5) forms both the outer boundary of the main lighting surface (3) at the visible side and the functional unit (2).
3. A luminaire in accordance with any one of the preceding claims, characterized in that the functional unit (2) supporting the flat frame (5) is made as a light permeable body, in particular as an opal glass body or as a single-part or multi-part plastic body.
4. A luminaire in accordance with claim 3, characterized in that the flat frame (5) is inserted in an areally flush manner into a matching cut-out of the front wall of the functional unit (2).
5. A luminaire in accordance with any one of the preceding claims, characterized in that the reflector (10) provided between the base wall (4) of the housing (1) and the main lighting surface (3) is concavely curved and its lowest region is disposed adjacent to the base (4) of the housing (1).
6. A luminaire in accordance with any one of the preceding claims, characterized in that, in addition to the main lighting surface (3), side lighting surfaces (11), which are illuminated with light via the reflector (9, 10) and optionally also directly, are provided between the flat frame (3) and the housing (1).
7. A luminaire in accordance with claim 6, characterized in that part reflector surfaces (9) are associated with the side lighting surfaces (11) which are formed by angled marginal regions of the concavely curved reflector (10).
8. A luminaire in accordance with any one of the preceding claims, characterized in that the LED carriers (6) are connected to fixing rails (6') or are made in one part which contact the wall of the functional unit (2) beneath the flat frame (5) and are connected to the flat frame (5) and mounted via heat conducting connection elements (12) passing through the wall of the functional unit (2).
9. A luminaire in accordance with any one of the preceding claims, characterized in that the support surface (8) for the LEDs (20) is made reflective.
10. A luminaire in accordance with any one of the preceding claims, characterized in that an optical lens system is associated with the LEDs (20), with either an individual lens being provided for each LED or an optical unit common to all LEDs being provided.
11. A luminaire in accordance with any one of the preceding claims, characterized in that the angle between the surface (8) carrying the LEDs (20) and the fixing rails (6') contacting the main lighting surface (3) at the rear side can be adjusted.
12. A luminaire in accordance with one or more of the preceding claims, characterized in that the functional unit (2) is made as a spatial body expanding at all sides starting from the housing (1) of a flat pot shape or having a presettable spacing from the housing (1) and preferably has a base section (13) couplable to the housing (1) and an expanding slanted surface section (14) which adjoins it and which merges into a marginal section (15) which is made as a support for the main lighting surface (3) and the flat frame (5).
13. A luminaire in accordance with claim 12, characterized in that the main lighting surface (3) includes a plastic plate which is provided with a microprism structure and which is preferably covered with a glass plate at the prism side and with a light scattering foil at the rear side.
14. A luminaire in accordance with claim 13, characterized in that the substantially planar main lighting surface (3) is combined with the flat frame (5) to form a unit and is connected, in particular welded or adhesively bonded, via an angled peripheral wall to the marginal section (15) of the spatial body.
15. A luminaire in accordance with claim 12, characterized in that a reflector (16), preferably a planar reflector, forming a dividing wall is arranged between the base section (13) and the slanted surface section (14).
16. A luminaire in accordance with claim 15, characterized in that the inner walls of the slanted surface section (14) are made reflective.
17. A luminaire in accordance with claim 12, characterized in that the functional unit (2) is couplable via clamping clips (18) to the housing (1).
18. A luminaire in accordance with claim 12, characterized in that the light emitting diodes (20) positioned beneath the flat frame (5) and illuminating the reflector (16) are connected to the associated energy supply arranged in the region of the housing (1) via conducting wires (21) which extend in accordance with the folding edges (17) between adjacent slanted wall part surfaces.
19. A luminaire in accordance with claim 18, characterized in that the conducting wires (21) are electrically connected to the LEDs (20) via a spring contact engaging at a contact surface (24) at the LED carrier (6).
20. A luminaire in accordance with one or more of the preceding claims,
    characterized in that the housing (1), functional unit (2) and flat frame (5) have a polygonal structure, in particular a rectangular structure, or a round structure.

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