WO2013150220A1

WO2013150220A1 - Electroluminescent diode lighting device

Info

Publication number: WO2013150220A1
Application number: PCT/FR2013/050677
Authority: WO
Inventors: Jean-Laurent HOUOT
Original assignee: Lucibel Sa
Priority date: 2012-04-03
Filing date: 2013-03-28
Publication date: 2013-10-10
Also published as: FR2988810A1; FR2988810B1

Abstract

This device (1) comprises a housing (2) in the shape of a frame delimiting an opening (3) through which ambient air is intended to flow, means for attaching the housing (2) to a support, and at least one lighting module (15) attached to the housing (2) and disposed across the opening (3), each lighting module (15) comprising a heat sink (16), an optical portion assembled to the heat sink (16), and a printed circuit supporting at least one electroluminescent diode forming a light source, the printed circuit being interposed between the optical portion and the heat sink (16) and enclosed in the assembly formed by the assembly of the heat sink (16) and the optical portion.

Description

Light-emitting diode lighting device

The present invention relates to a lighting device with light-emitting diodes.

A light-emitting diode lighting device conventionally comprises one or more light-emitting diodes supported by a printed circuit.

Given the issues of sustainable development, it is important that existing lighting devices offer low energy consumption and a long service life.

It is also important for the proper functioning of existing lighting devices that they have effective heat dissipation solutions.

Known lighting devices include heat dissipation means that dissipate the heat generated during operation.

However, the traditional heat dissipation means are sometimes unsuitable for use in a hostile environment, for example loaded with dust, moisture, etc., especially for outdoor use, which requires the protection of the printed circuit and the light-emitting diodes.

It thus appears that existing LED lighting devices are sometimes subject to conflicting requirements: effective dissipation of the heat generated in operation on the one hand, and protection of the electronics on the other hand.

In this technical context, the present invention aims at overcoming all or part of these drawbacks by proposing a lighting device that offers both an efficient heat dissipation of the heat generated during operation and a protection of the printed circuit against external environment aggression. while offering less energy consumption and low maintenance.

For this purpose, the present invention relates to a lighting device with light-emitting diodes, characterized in that it comprises a frame-shaped frame defining an opening through which is intended to circulate the ambient air, means fastening the frame to a support, and at least one lighting module attached to the frame and arranged across the opening, each lighting module comprising a heat sink, an optical portion assembled to the heat sink, and a printed circuit supporting at least one light-emitting diode forming a light source, the printed circuit being interposed between the optical portion and the heat sink and enclosed in the assembly formed by the assembly of the heat sink and of the optical part.

Thus, the lighting device according to the invention provides an effective heat dissipation of the heat generated during its operation by allowing air to flow through the opening defined by the frame, that is to say between the lighting modules, and both effective protection of the printed circuit and light-emitting diodes encapsulated between the optical portion and the heat sink. Finally, light-emitting diodes allow less electricity consumption, a long life, and require little maintenance.

According to a characteristic of the lighting device according to the invention, each lighting module comprises sealing means arranged to seal the junction between the heat sink and the optical portion.

According to one embodiment, the sealing means comprise at least one sealing member arranged around the printed circuit.

If necessary, the optical part and the heat sink can be assembled by clamping.

According to another embodiment, the sealing means comprise an adhesive connecting the heat sink and the optical portion around the printed circuit.

According to one possibility, each lighting module comprises at least one groove and at least one rib nested and extending at the periphery of the printed circuit.

According to another characteristic of the lighting device according to the invention, the lighting device comprises guide means for the flow of rainwater or runoff.

Advantageously, the guiding means further protect the printed circuit by moving the runoff water away from the junction between the heat sink and the optical part which is the zone through which water could infiltrate towards the light-emitting diodes. According to one embodiment, the guiding means comprise at least one oblique lateral wing extending from a longitudinal edge of the optical part or the heat sink.

According to a characteristic of the lighting device according to the invention, the latter comprises a plurality of lighting modules spaced a predetermined distance from each other to form between two adjacent lighting modules an opening for the passage of the light. 'ambiant air.

Thus, the openings between each of the lighting modules allow the circulation of the ambient air, for example by natural convection, through the opening defined by the frame.

Advantageously, the lighting device according to the invention comprises protection means arranged vertically above each lighting module.

This feature has the advantage of allowing the protection of lighting modules, including their heat sink, the fall of a foreign body.

According to another characteristic of the lighting device according to the invention, the protection means are shaped to delimit with the frame at least one passage allowing the flow of ambient air through the opening defined by the frame.

This passage defined by a part of the protection means and part of the frame is intended to allow the circulation of ambient air through the opening defined by the frame, and between the lighting modules: the protection means n ' thus not hermetically sealing the opening defined by the frame.

Advantageously, the protection means comprise a cover comprising at least one hole intended for the circulation of ambient air through the opening defined by the frame.

The holes, or slots, allow the flow of ambient air through the protective cover.

According to one possibility, the support is a pole whose end supports the lighting device and another end is intended to be attached to the ground.

Thus, the lighting device can be used for example as a street lamp for street lighting or as a light source in a stadium. The stand can also be a wall or a ceiling.

Other characteristics and advantages of the present invention will emerge clearly from the following description of an embodiment of the invention, given by way of non-limiting example, with reference to the appended drawings in which:

FIG. 1 is a partially exploded view, in perspective and from above, of a lighting device according to one embodiment of the invention,

FIG. 2 is a partially exploded view from above and in perspective of a part of a lighting device according to one embodiment of the invention,

FIG. 3 is a partially exploded view from above and in perspective of a part of a lighting device according to one embodiment of the invention,

FIG. 4 is a perspective view of a lighting module of a lighting device according to one embodiment of the invention,

FIG. 5 is a perspective sectional view of a lighting module of a lighting device according to one embodiment of the invention,

FIG. 6 is an exploded view, in perspective and from below, of a lighting module of a lighting device according to one embodiment of the invention,

FIGS. 7, 8, 9 and 10 are views of a lighting device according to one embodiment of the invention, illustrating its operation,

FIG. 11 is a view of a particular embodiment of a lighting device according to the invention,

FIG. 12 is a view of a particular embodiment of a lighting device according to the invention,

- Figures 13 to 15 are views of a lighting module of a lighting device according to a particular embodiment of the invention. Figure 1 shows a lighting device 1 according to one embodiment of the invention.

The lighting device 1 comprises a framework 2 in the form of a frame, here closed. The frame 2 defines an opening 3 allowing the circulation of ambient air. The frame 2 may be formed of a plurality of sections 4 which are assembled to each other, for example by embedding as illustrated in FIG. 2.

The lighting device 1 can be fixed to a support, especially a high support (that is to say a height of the order of a few meters), such as a pole 5 partially shown in FIG. pole 5 may have one end fixed to the ground and another end 10 which is intended to be attached to the lighting device 1, by means of fixing means. In the example of Figure 3, the fixing means comprise a hollow tubular body 1 1 allowing the passage of electrical cables. One end of the hollow tubular body 1 1 is inserted into the pole 5, and another end of this hollow tubular body 1 1 supports the lighting device 1. This other end has in the example of Figure 3 a shape substantially U. This U-shaped end comprises in particular two lugs 12 each intended to be embedded in one of the profiles 4 of the frame 2.

The lighting device 1 according to the invention comprises at least one lighting module 15. Each lighting module 15 is attached to the frame 2, and comprises a heat sink 16, a printed circuit 17, and an optical portion 20, as illustrated in FIGS. 4, 5 or 6.

The printed circuit 17 is interposed between the optical portion 20 and the heat sink 16. It is enclosed in the assembly formed by the assembly of the heat sink 16 and the optical portion 20.

The heat sink 16 may include ends 21 forming spans each intended to bear against a rib 22 of one of the profiles 4 of the frame 2, as shown in Figure 2. Fixing means, such as a screw and a nut 23, can be used to secure each heat sink 16 to the frame 2.

The heat sink 16 may comprise a plurality of fins 24 disposed in the substantially parallel described embodiment at regular intervals. The fins 24 are intended to increase the heat exchange surface to increase the speed of heat exchange between the heat sink 16 and the ambient air. As can be seen for example in FIG. 5, the optical part 20 can be assembled against the heat sink 16, more particularly against the face of the heat sink 16 opposite to that from which the fins 24 extend.

Each lighting module 15 comprises a junction zone 42 of the heat sink 16 and the optical portion 20. The junction zone 42 advantageously surrounds the printed circuit 17.

Each module 15 advantageously comprises sealing means arranged to protect the printed circuit board 17.

According to the embodiment of Figures 13 to 15, the sealing means comprise a sealing member, for example a seal 26. The seal 26 advantageously surrounds the printed circuit 17. As is visible on 14, the seal 26 is interposed between the optical portion 20 and the heat sink 16, in the junction zone 42.

Still according to the embodiment of Figures 13 to 15, the optical portion 20 and the heat sink 16 are assembled by clamping against each other, so as to compress the seal 26.

According to the embodiment illustrated in FIGS. 4 and 5, the sealing means comprise an adhesive arranged at the periphery of the printed circuit 17 to connect the optical portion 20 and the heat sink 16. The glue is advantageously deposited in the junction zone 42.

Each illumination module 15 may optionally include at least one groove 25 and at least one rib 30 of complementary shapes extending around the printed circuit 17.

More particularly, according to the embodiment shown in Figures 4 to 6, the groove or grooves 25 are formed on the heat sink 16 while the rib or ribs 30 are formed on the optical portion 20. Thus, the optical portion 20 and the heat sink 16 are shaped to fit.

According to the embodiment of FIGS. 1 to 15, the groove or grooves 25 are formed on the optical part 20 while the rib or ribs 30 are formed on the seal 26.

As illustrated in FIGS. 13 to 15, the optical portion 20 may comprise at least one gland 27 adapted for the passage of electrical cables and contributing to the sealing of the lighting module 15. As can be seen in FIG. 5, the optical portion 20 may comprise a housing 31 intended to receive the printed circuit 17. This housing 31 advantageously matches the shape of the printed circuit 17, so that the latter fits into the housing 31 .

In the example of Figure 2, the housing 31 is sized to contain the entire printed circuit 17, so that the latter completely fits into the housing 31.

The optical part 20 comprises receiving receptacles 32 of light-emitting diodes 33 forming a light source.

It also comprises a plurality of lenses 34. The lenses 34 may correspond to separate parts attached to the optical portion 20 or may be an integral part of the optical portion 20, that is to say forming with it a single and same room.

The lenses 34 are shaped to optimize the angle of diffusion of the light emitted by the light-emitting diodes 33.

The printed circuit 17 comprises an upper face 35, which may be intended to bear against the heat sink 16, and a lower face 40 intended to bear against the optical portion 20 and supporting the light-emitting diodes 33. The light-emitting diodes 33 are electrically interconnected through the printed circuit 17. It is advantageously power diodes, that is to say power diodes greater than 1 Watt.

The lighting device 1 may furthermore comprise power supply means (not shown) for the light-emitting diodes 33, known to those skilled in the art. The power supply means may include a transformer 41, visible in Figure 1 1.

As can be seen in FIG. 6 (on which the optical portion 20 is shown in transparency) or in FIG. 13, the printed circuit 17 may correspond substantially to a rectangular plate. By plate is meant any element one dimension (the thickness) is negligible compared to the other two.

As can be seen in particular in FIGS. 4 and 5 or 13 to 15, each lighting module 15 may comprise means for guiding the rainwater or runoff, arranged to divert the rainwater or runoff from the junction zone. between the optical part 20 and the heat sink 16. Arrows referenced 36 in Figures 9 and 10 illustrate the flow of rainwater or runoff.

The guide means may comprise lateral flanges 43 extending from a longitudinal edge 44 of the optical portion 20. As can be seen in FIG. 5, the lateral flanges 43 may form with the optical part 20 one and the same piece. Each side wing 43 extends obliquely, and forms with a side wall 45 of the heat sink 16 a predetermined angle a, for example between 90 ° and 180 °.

As shown in FIGS. 7 to 9, the lighting device 1 may comprise a plurality of lighting modules. Where appropriate, the illumination modules may be arranged substantially parallel to one another and spaced from the adjacent illumination module (s) so that apertures 50 for the passage of ambient air and rainwater or runoff are formed between the lighting modules. The arrows referenced 46 in FIG. 8 illustrate an ascending natural convection movement of the ambient air passing through the openings 50.

The lighting device 1 may also include means for protecting the lighting modules, more particularly their heat sink 16. These protection means may comprise, as illustrated in FIGS. 1 and 3, and 7 to 9, a protective cover 51 or a protective grille.

The cover 51 is fixed to the frame 2, directly above the lighting modules 15 to protect them from waste, for example tree leaves or plastic bags, which could cover the heat sinks 16 and consequently alter their operation.

The cover 51 may include a plurality of holes 54 or slots for the passage of ambient air through the cover 51, as shown in Figure 7 in which the arrows referenced 46 correspond to a convection movement natural ascending of ambient air

The cover 51 of protection is shaped to define with the frame 2 passages 52 allowing the flow of air between the modules 15 and through the opening 3 delimited by the frame 2. In other words, the cover 51 protection is shaped not to close the opening 3 delimited by the frame 2. The protective cover 51 can thus have a partially shaped cylindrical, so that each of its ends 53, in arc-of-circle, releases a passage 52 between the protective cover 51 and the frame 2.

Of course, the invention is not limited to the embodiment described above, this embodiment having been given as an example. Modifications are possible, in particular from the point of view of the constitution of the various elements or by the substitution of technical equivalents, without departing from the scope of protection of the invention.

Thus, the lighting device 1 could comprise a single lighting module, as shown in FIG. 12.

Thus, instead of being supported by the pole 5, the lighting device 1 can be fixed against a wall or suspended from a ceiling, for example by means of straps, and be used indoors, especially in a shed, a warehouse or a factory.

Claims

1. Device (1) for lighting with light emitting diodes, characterized in that it comprises a frame (2) in the form of a frame delimiting an opening (3) through which is intended to circulate the ambient air, fixing means from the frame (2) to a support, and at least one lighting module (15) attached to the frame (2) and arranged across the opening (3), each lighting module (15) comprising a dissipator ( 16), an optical portion (20) assembled to the heat sink (16), and a printed circuit (17) supporting at least one light-emitting diode (33) forming a light source, the printed circuit (17) being interposed between the optical portion (20) and the heat sink (16) and enclosed in the assembly formed by the assembly of the heat sink (16) and the optical portion (20).

2. Device (1) for lighting according to claim 1, characterized in that each lighting module (15) comprises sealing means arranged to seal the junction between the heat sink (16) and the optical portion ( 20).

3. Device (1) for lighting according to claim 2, characterized in that the sealing means comprise at least one sealing member arranged around the printed circuit (17).

4. A light emitting diode lighting device (1) according to one of claims 1 to 3, characterized in that each lighting module (15) comprises at least one groove (25) and at least one rib (30). nested and extending peripherally of the printed circuit (17).

5. Light-emitting diode lighting device (1) according to one of claims 1 to 4, characterized in that the lighting device (1) comprises guide means for the flow of rainwater or runoff .

6. A light-emitting diode lighting device (1) according to claim 5, characterized in that the guiding means comprise at least one at least one oblique side wing (43) extending from a longitudinal edge (44) of the optical portion (20) or heat sink (16).

7. A light emitting diode lighting device (1) according to one of claims 1 to 6, characterized in that it comprises a plurality of lighting modules (15) spaced a predetermined distance from each other for forming between two adjacent lighting modules (15) an opening (50) for the passage of ambient air.

8. Device (1) lighting LEDs according to one of claims 1 to 7, characterized in that it comprises protection means arranged vertically above each lighting module (15).

9. A light emitting diode lighting device (1) according to claim 8, characterized in that the protection means are shaped to delimit with the frame (2) at least one passage (52) allowing the circulation of ambient air to through the opening (3) delimited by the frame (2).

10. A light emitting diode lighting device (1) according to claim 8 or 9, characterized in that the protection means comprise a cover (51) comprising at least one hole (54) intended for the circulation of ambient air at through the opening (3) delimited by the frame (2).