EP2834558A1 - Light-emitting diode lamp - Google Patents

Light-emitting diode lamp

Info

Publication number
EP2834558A1
EP2834558A1 EP13719953.5A EP13719953A EP2834558A1 EP 2834558 A1 EP2834558 A1 EP 2834558A1 EP 13719953 A EP13719953 A EP 13719953A EP 2834558 A1 EP2834558 A1 EP 2834558A1
Authority
EP
European Patent Office
Prior art keywords
lamp
printed circuit
conduit
duct
lighting modules
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13719953.5A
Other languages
German (de)
French (fr)
Inventor
Jean-Laurent HOUOT
Sébastien Leroy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lucibel SA
Original Assignee
Lucibel SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lucibel SA filed Critical Lucibel SA
Publication of EP2834558A1 publication Critical patent/EP2834558A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/85—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material
    • F21V29/86—Ceramics or glass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20—Light sources comprising attachment means
    • F21K9/23—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
    • F21K9/232—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F21V29/763—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section the planes containing the fins or blades having the direction of the light emitting axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/83—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks the elements having apertures, ducts or channels, e.g. heat radiation holes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/06—Arrangement of electric circuit elements in or on lighting devices the elements being coupling devices, e.g. connectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/75—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with fins or blades having different shapes, thicknesses or spacing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to a light emitting diode lamp.
  • LED lamps traditionally comprise a heat sink in contact with the ambient air, generally located at the rear of these lamps, at a non-visible part thereof (for example behind a false ceiling ).
  • the speed of the heat exchange between the heat sink and the ambient air is important for the proper functioning of the LED lamps.
  • existing LED lamps are generally intended to operate in a predetermined orientation.
  • existing LED lamps conventionally include optics and LEDs facing down to illuminate a subjacent area, while the heat sink is arranged upwardly.
  • these LED lamps can not operate properly in another position, especially in an inverted position (optical and LED up and heat sink down). Indeed, the diffusion of the air heated by the heatsink would be hindered by the rest of the lamp.
  • CN101761812 shows a light emitting diode lamp.
  • the lamp according to document CN101761812 has a base with slots allowing the air to rush into the base, where is the power supply (or driver), so that the air is heated by the power supply. even before reaching the cooling zone of the light-emitting diodes.
  • the patent documents US2009 / 1 16233, US2005 / 174780 and US201 1/0140587 also show lighting devices in which the air rushes into the base, via slots or orifices formed thereon, before reaching in the cooling zone of the light sources, which also leads to relatively inefficient cooling.
  • the present invention aims to overcome all or part of these disadvantages by providing an LED lamp for efficient and rapid heat dissipation of the heat generated during operation, including for reversed operating positions, while being of reliable structure and inexpensive.
  • the subject of the present invention is a light-emitting diode lamp, characterized in that the lamp comprises a base supporting at least one lighting module, the lighting module or modules delimiting at least one duct for drawing and air outlet comprising at least one proximal opening located near the base and adapted for the introduction of air into the duct or the discharge of air from the duct, and at least one distal opening opposite to the or the proximal openings and adapted for discharging air out of the duct or introducing air into the duct, each lighting module comprising at least one printed circuit with an outer face supporting at least one light-emitting diode and one face interior directed towards the duct, in order to generate an air circulation effect in the duct contributing to the cooling of the printed circuits.
  • the lamp according to the invention provides efficient cooling of the printed circuits supporting the light-emitting diodes.
  • the printed circuits heat up. Due to the orientation of their inner face to the duct, the ambient air in the duct also heats. The hot air in the duct rises and is discharged through the distal end (for a lamp whose distal end is directed upwards). This results in the suction of fresh air near the proximal openings. This fresh air is accelerated in the duct towards the distal opening, heating up to its discharge via the distal end.
  • the air flow is substantially vertical, not radial, the air inlet is from the bottom and the outlet from the top of the lamp.
  • the lamp according to the invention can be used in a reverse position, that is to say distal opening oriented downwards.
  • the fresh air is then sucked through the distal opening, warms up and accelerates until it is evacuated via the proximal openings.
  • the lamp according to the invention produces a pulling effect, therefore natural, passive.
  • the air flow in the chimney duct is not performed by means of forced convection.
  • the lighting module or modules comprise ceramic heat dissipation means.
  • the printed circuit of one or of one of the lighting modules is ceramic.
  • the outer face of the printed circuit of one or of one of the lighting modules is at least partially covered by a ceramic coating.
  • the outer face of the printed circuit of the or one of the lighting modules is at least partially covered by a ceramic plate attached and arranged in abutment against the outer face.
  • the lamp comprises a plurality of lighting modules, and the lamp comprises, inside the duct for drawing and discharging, between the lighting modules, an interposing member forming an obstacle to the radiation heat transmission from one of the lighting modules to another of the lighting modules.
  • the interposition member has a plurality of interposition faces, as far as the lamp comprises lighting modules, each interposition face being arranged opposite and at a distance from the outer face of the printed circuit of one of the lighting modules.
  • the interposer is made of plastic.
  • each lighting module comprises a frame bearing against the printed circuit, the frame comprising a first functional wall at least partially delimiting the conduit, in which the frame forms a flange framing the printed circuit and supports an optical , in which the printed circuit is embedded in the frame.
  • each lighting module comprises a frame resting against the printed circuit, the frame comprising a first functional wall at least partially delimiting the conduit, in which the frame forms a collar flanking the printed circuit and supports an optical element, wherein the frame is overmolded on the circuit board or ultrasonically welded with the printed circuit board.
  • the tightness achieved between the optics and the frame provides a lack of optical opacity, the cooling air flow does not penetrate to the optics.
  • each lighting module comprises a frame resting against the printed circuit, the frame comprising a first functional wall at least partially delimiting the conduit.
  • the base comprises at least one cavity opening in the extension of the or one of the proximal openings to increase the flow of air entering or leaving each proximal opening.
  • a cavity is not an opening opening, so that the air flowing through the cavity can not enter the base on which this cavity is formed, and therefore can not be heated by a power supply.
  • each lighting module comprises a heatsink bearing against the inner face of the printed circuit.
  • the heat sink comprises at least one heat dissipating fin extending in the conduit in a direction substantially parallel to that of the conduit.
  • the lamp comprises a plurality of lighting modules.
  • the lamp comprises at least one spacer arranged in the conduit to maintain a constant spacing between the lighting modules.
  • the printed circuits of the lighting modules are regularly distributed around the duct to allow 360 ° illumination around the duct.
  • the lamp comprises means of electrical connection between each printed circuit and a power supply suitable for supplying the light-emitting diodes, the electrical connection means comprising a main printed circuit to which each printed circuit is connected and to which the power supply is connected. electric.
  • the lamp comprises means for fixing each lighting module on the base, the fixing means comprising at least one locking member and a housing shaped to receive and snap the detent member.
  • FIG. 1 is a perspective view of a lamp according to one embodiment of the invention
  • FIG. 2 is a view from above of a lamp according to one embodiment of the invention.
  • FIG. 3 is an exploded view of a lamp according to one embodiment of the invention.
  • FIG. 4 is an exploded and front view of a lighting module of a lamp according to one embodiment of the invention.
  • FIG. 5 is an exploded rear view of a lighting module of a lamp according to one embodiment of the invention
  • FIG. 6 is a schematic view from above and in perspective of a lamp according to another embodiment of the invention
  • FIGS. 7 to 9 are top and side views of a lamp according to one embodiment of the invention.
  • FIG. 1 shows a lamp 1 according to one embodiment of the invention.
  • the lamp 1 comprises a base 2 on which are fixed one or more lighting modules 4.
  • the lamp 1 advantageously comprises a plurality of lighting modules 4, for example three lighting modules 4, as shown in FIG. 1.
  • the lighting modules 4 are arranged and shaped to delimit a duct 6 intended for the circulation of the ambient air between the lighting modules 4.
  • the lighting modules 4 can extend in a substantially parallel manner with respect to each other. to others, as in the example of Figure 1.
  • the duct 6 comprises a distal opening 8 and, according to the embodiment illustrated in Figure 1, three proximal openings 10 located near the base 2.
  • the duct 6 may have a substantially flared shape.
  • the conduit 6 is intended for drawing and evacuating ambient air from the proximal openings 10 towards the distal end 8, or conversely if the lamp 1 is reversed, to allow the lighting modules 4 to cool.
  • conduit means a substantially longitudinal space forming a chimney for drawing a fluid through an inlet and the evacuation of the fluid via an outlet, with the creation of an acceleration of the air circulation in the space forming a chimney.
  • the duct 6 may have lateral slots 12 widening towards the distal opening 8 and / or the proximal openings 10, as long as the lateral slots 12 do not substantially affect the pulling and evacuation effect of air through the proximal openings 10 and the distal opening 8.
  • each lighting module 4 comprises a printed circuit 14.
  • the printed circuit 14 comprises an inner face 16 directed towards the inside of the conduit 6, and an outer face 18 supporting a plurality of light emitting diodes (LEDs) 20.
  • the LEDs 20 advantageously correspond to power diodes for lighting a room. They can have a power greater than 1 Watt.
  • the LEDs 20 of each lighting module 4 can be aligned substantially parallel to the direction in which the duct 6 extends.
  • the base 2 may comprise an inner housing 22 containing a power supply 24.
  • the power supply 24 is adapted to power the LEDs 20.
  • the base 2 can comprise a main portion 26, in which the inner housing 22 can be formed, and a secondary portion 28 forming a lid fixed on the main portion 26.
  • the lighting modules 4 can to be fixed on the secondary portion 28 of the base 2.
  • the base 2 advantageously comprises cavities 30 shaped to increase the inflow or outflow of air through the proximal openings 10.
  • the proximal openings 10 advantageously open out onto the cavities 30.
  • the lamp 1 can comprise means of electrical connection to a local electrical network, for example a base 32.
  • the base 32 is for example attached to the main portion 26.
  • the conduit 6 can extend in a direction substantially parallel to that in which extends the base 32.
  • the lighting modules 4 can also extend in a direction substantially parallel to that in which the base 32 extends.
  • the printed circuits 14 may be evenly distributed around the duct 6 so that the LEDs 20 radiate 360 ° radially around the duct 6.
  • the normal to each outer face 18 may extend in a substantially radial direction.
  • the lighting modules 4 are evenly distributed around the duct 6, every 120 °.
  • Each lighting module 4 may comprise a heat sink 34 resting against the inner face 16 of the printed circuit 14.
  • the heat sink 34 is located in the duct 6.
  • the heat sink 34 may comprise a plurality of fins 36 intended to increase the heat exchange surface.
  • the fins 36 extend in the duct 6.
  • Each fin 36 may advantageously extend in one direction substantially parallel to that in which the duct 6 extends, so as not to hinder the flow of air flowing in the duct 6.
  • the lamp 1 may also comprise a spacer 38.
  • the spacer 38 is here arranged in the duct 6 to maintain a constant spacing between the lighting modules 4.
  • the spacer 38 corresponds to a multipode member, tripod in this case (because the lamp 1 according to the embodiment of Figures 1 to 5 comprises three lighting modules 4).
  • the spacer 38 thus comprises here three feet 40, each leg 40 being in abutment against one of the lighting modules 4. The feet 40 can bear against the heat sink 34 of each lighting module 4.
  • Each lighting module 4 comprises a frame 42 forming a collar flanking the printed circuit 14.
  • the frame 42 bears against the outer face 18 of the printed circuit 14.
  • the frame 42 comprises a first functional wall 44 shaped to at least partially delimit the duct 6.
  • the first functional wall 44 extends at the periphery of the printed circuit 14; it surrounds the printed circuit 14.
  • the printed circuit 14 is advantageously encased in the frame 42.
  • the frame 42 may be overmoulded on the printed circuit 14, or overmolded if necessary on the assembly formed by the printed circuit 14 and the heat sink 34.
  • the frame 42 can be ultrasonically welded with the printed circuit board 14.
  • the frame 42 may comprise two parts 46, 48 between which the circuit board is arranged.
  • the frame 42 bears against the outer face 18 of the printed circuit 14.
  • the frame 42 advantageously comprises a plurality of openings 50, each opening 50 being intended to receive one of the LEDs 20.
  • the frame 42 may also include a second functional wall 52 extending around the LEDs 20.
  • the second functional wall 52 is advantageously reflective, for example coated with a layer of a reflective material. It can be concave, as in the example of Figures 4 and 5.
  • Each lighting module 4 may comprise an optic 54 supported for example by the frame 42.
  • the frame 42 can be glued to the base 2, in particular to the secondary portion 28 of the base 2.
  • the lamp 1 comprises means of electrical connection between each printed circuit 14 and the power supply 24 included in the base 2.
  • the electrical connection means comprise a main printed circuit 56 connected to the power supply 24.
  • Plug-in means like pins 58 and holes 60 formed in the main printed circuit 56 and intended to receive the pins 58, allow the electrical connection between each printed circuit 14 and the main electrical circuit 56.
  • the lamp 1 also comprises means for fixing each lighting module 4 on the base 2.
  • the fixing means comprise, for example, at least one deformable locking member 62 extending from a lower portion 64 of the frame 42, and a housing 66 for receiving the lower portion 64 of the frame 42 and shaped to engage the lighting module 4 on the base 2 when the detent member 62 is inserted into the housing 66.
  • the housing 66 may be provided on the secondary portion 28 of the base 2. It may advantageously lead to the main printed circuit 56 to allow the electrical connection between each printed circuit 14 and the main printed circuit 56.
  • each lighting module 4 comprises, instead of a heat sink 34, a ceramic plate 67 arranged in abutment against the outer face 18 of the corresponding printed circuit 14.
  • Each printed circuit board 14 may itself be made of ceramic material, or the outer face 18 of each printed circuit 14 may comprise a ceramic coating.
  • the ceramic plate, or the outer face 18 made of ceramic or supporting a ceramic coating is advantageously flat. It is devoid of fins extending inside the conduit.
  • an interposition member 68 may be arranged in the duct, between the lighting modules 4 and in particular at distance of the lighting modules 4, to limit the radiation heat transmission between the adjacent lighting modules 4.
  • the interposition member 68 may extend longitudinally in the conduit. It may have a triangular shape, and several faces 70, as far as the lamp 1 comprises lighting modules 4, in this case three, each face 70 being arranged opposite and at a distance from the outer face 18 of one
  • the faces 70 may be substantially parallel to the outer face 18 to which they face.
  • the interposition member 68 may correspond to a plastic part, which is thermally non-conductive.
  • the lamp 1 may comprise more or less than three lighting modules 4.
  • the duct 6 may be devoid of lateral slots 12 separating the lighting modules 4, so that the lighting modules 4 are connected to each other.
  • the lighting module or modules 4, and in particular their optics 54 and their frame 42 may be shaped together to form a sphere, as illustrated in FIGS. 7 to 9.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Abstract

This lamp (1) comprises a base (2) supporting one or more lighting modules (4) delimiting an air draft and evacuation duct. The duct comprises a proximal opening (10) in proximity to the base (2) for the introduction of air into the duct or the evacuation of air from the duct, and a distal opening (8) for the evacuation of air from the duct or the introduction of air into the duct. Moreover, each lighting module (4) comprises a printed circuit with an exterior face supporting at least one light-emitting diode (20) and an interior face oriented towards the duct, with a view to generating an air circulation effect in the duct contributing to the cooling of the printed circuit or circuits.

Description

Lampe à diode électroluminescente  Light emitting diode lamp
La présente invention concerne une lampe à diodes électroluminescentes. The present invention relates to a light emitting diode lamp.
Les lampes à diodes électroluminescentes (LED) comprennent traditionnellement un dissipateur thermique au contact de l'air ambiant, généralement situé à l'arrière de ces lampes, au niveau d'une partie non visible de celles-ci (par exemple derrière un faux plafond).  Light-emitting diode (LED) lamps traditionally comprise a heat sink in contact with the ambient air, generally located at the rear of these lamps, at a non-visible part thereof (for example behind a false ceiling ).
La rapidité de l'échange thermique entre le dissipateur thermique et l'air ambiant est importante pour le bon fonctionnement des lampes à LED.  The speed of the heat exchange between the heat sink and the ambient air is important for the proper functioning of the LED lamps.
Il est notamment connu de faciliter cet échange en accroissant la surface du dissipateur thermique au contact de l'air, c'est-à-dire en augmentant la surface d'échange. Toutefois, cette solution s'avère limitée dans la mesure où elle se traduit par la réalisation de dissipateurs thermiques plus ou moins encombrants et/ou de forme plus ou moins complexe.  It is particularly known to facilitate this exchange by increasing the surface of the heat sink in contact with the air, that is to say by increasing the exchange surface. However, this solution is limited in that it results in the production of heatsinks more or less bulky and / or more or less complex shape.
Il est aussi connu d'accélérer la dissipation de chaleur en réalisant le dissipateur thermique dans un matériau présentant avantageusement une bonne conductivité thermique. Cependant, cette solution s'avère limitée du fait du nombre restreint de matériaux adéquats ou des coûts de développement de matériaux nouveaux.  It is also known to accelerate the dissipation of heat by producing the heat sink in a material advantageously having good thermal conductivity. However, this solution is limited because of the limited number of suitable materials or the costs of developing new materials.
Par ailleurs, on notera que les lampes à LED existantes sont généralement destinées à fonctionner selon une orientation prédéterminée. Ainsi, les lampes à LED existantes comprennent classiquement une optique et des LED orientées vers le bas pour éclairer une zone subjacente, tandis que le dissipateur thermique est disposé vers le haut. Cependant, ces lampes à LED ne peuvent correctement fonctionner dans une autre position, en particulier dans une position inversée (optique et LED vers le haut et dissipateur thermique vers le bas). En effet, la diffusion de l'air chauffé par le dissipateur serait entravée par le reste de la lampe.  Furthermore, it should be noted that existing LED lamps are generally intended to operate in a predetermined orientation. Thus, existing LED lamps conventionally include optics and LEDs facing down to illuminate a subjacent area, while the heat sink is arranged upwardly. However, these LED lamps can not operate properly in another position, especially in an inverted position (optical and LED up and heat sink down). Indeed, the diffusion of the air heated by the heatsink would be hindered by the rest of the lamp.
Le document CN101761812 montre une lampe à diodes électroluminescentes. Cependant, la lampe selon le document CN101761812 présente une base avec des fentes permettant à l'air de s'engouffrer dans la base, où se trouve l'alimentation (ou driver), si bien que l'air est réchauffé par l'alimentation avant même de parvenir dans la zone de refroidissement des diodes électroluminescentes. Il en résulte un refroidissement relativement peu efficace. Les documents de brevet US2009/1 16233, US2005/174780 et US201 1 /0140587 montrent également des dispositifs d'éclairage dans lesquels l'air s'engouffre dans la base, via des fentes ou orifices ménagés sur celle-ci, avant de parvenir en zone de refroidissement des sources lumineuses, ce qui conduit là aussi à un refroidissement relativement peu efficace. CN101761812 shows a light emitting diode lamp. However, the lamp according to document CN101761812 has a base with slots allowing the air to rush into the base, where is the power supply (or driver), so that the air is heated by the power supply. even before reaching the cooling zone of the light-emitting diodes. This results in a relatively inefficient cooling. The patent documents US2009 / 1 16233, US2005 / 174780 and US201 1/0140587 also show lighting devices in which the air rushes into the base, via slots or orifices formed thereon, before reaching in the cooling zone of the light sources, which also leads to relatively inefficient cooling.
Pour améliorer l'efficacité du refroidissement, le document US2005/174780 propose de créer un mouvement de convection forcée de l'air de refroidissement, en ajoutant un ventilateur. Cependant, cette solution présent l'inconvénient d'augmenter le coût de fabrication du dispositif, et son coût de fonctionnement, car le ventilateur doit être alimenté.  To improve the efficiency of cooling, the document US2005 / 174780 proposes to create a forced convection movement of the cooling air, by adding a fan. However, this solution has the disadvantage of increasing the manufacturing cost of the device, and its cost of operation, because the fan must be powered.
On notera également que dans les dispositifs d'éclairage selon les documents US2005/174780 et US201 1 /0140587, l'air de refroidissement peut cheminer dans la partie optique. Cela peut entraîner l'accumulation de poussières sur cette partie optique, donc une opacification de la partie optique. L'efficacité de l'éclairage peut donc décliner en cours de vie de la lampe.  It will also be noted that in lighting devices according to US2005 / 174780 and US201 1/0140587, the cooling air can travel in the optical part. This can cause the accumulation of dust on this optical part, so opacification of the optical part. The efficiency of the lighting can therefore decline during the life of the lamp.
Dans tous les cas, efficacité du rendement thermique moindre ou opacification de la partie optique, la durée de vie de la lampe est affectée et limitée.  In any case, efficiency of the lower thermal efficiency or opacity of the optical part, the life of the lamp is affected and limited.
Aussi la présente invention a pour but de pallier tout ou partie de ces inconvénients en proposant une lampe à LED offrant une dissipation thermique efficace et rapide de la chaleur générée en fonctionnement, y compris pour des positions de fonctionnement inversées, tout en étant de structure fiable et peu coûteuse.  Also the present invention aims to overcome all or part of these disadvantages by providing an LED lamp for efficient and rapid heat dissipation of the heat generated during operation, including for reversed operating positions, while being of reliable structure and inexpensive.
A cet effet, la présente invention a pour objet une lampe à diode électroluminescente, caractérisée en ce que la lampe comprend une base supportant au moins un module d'éclairage, le ou les modules d'éclairage délimitant au moins un conduit de tirage et d'évacuation d'air comprenant au moins une ouverture proximale localisée à proximité de la base et adaptée pour l'introduction d'air dans le conduit ou l'évacuation d'air hors du conduit, et au moins une ouverture distale opposée à la ou les ouvertures proximales et adaptée pour l'évacuation d'air hors du conduit ou l'introduction d'air dans le conduit, chaque module d'éclairage comprenant au moins un circuit imprimé avec une face extérieure supportant au moins une diode électroluminescente et une face intérieure orientée vers le conduit, en vue de générer un effet de circulation d'air dans le conduit contribuant au refroidissement du ou des circuits imprimés. Ainsi, la lampe selon l'invention offre un refroidissement efficace des circuits imprimés supportant les diodes électroluminescentes. En fonctionnement, les circuits imprimés chauffent. Du fait de l'orientation de leur face intérieure vers le conduit, l'air ambiant dans le conduit chauffe également. L'air chaud dans le conduit s'élève et est évacué par l'extrémité distale (pour une lampe dont l'extrémité distale est orientée vers le haut). Il en résulte l'aspiration d'air frais à proximité des ouvertures proximales. Cet air frais circule de façon accélérée dans le conduit en direction de l'ouverture distale en s'échauffant jusqu'à son évacuation via l'extrémité distale. On notera que la circulation d'air est sensiblement verticale, et non radiale, l'entrée d'air se faisant par le bas et la sortie par le haut de la lampe. For this purpose, the subject of the present invention is a light-emitting diode lamp, characterized in that the lamp comprises a base supporting at least one lighting module, the lighting module or modules delimiting at least one duct for drawing and air outlet comprising at least one proximal opening located near the base and adapted for the introduction of air into the duct or the discharge of air from the duct, and at least one distal opening opposite to the or the proximal openings and adapted for discharging air out of the duct or introducing air into the duct, each lighting module comprising at least one printed circuit with an outer face supporting at least one light-emitting diode and one face interior directed towards the duct, in order to generate an air circulation effect in the duct contributing to the cooling of the printed circuits. Thus, the lamp according to the invention provides efficient cooling of the printed circuits supporting the light-emitting diodes. In operation, the printed circuits heat up. Due to the orientation of their inner face to the duct, the ambient air in the duct also heats. The hot air in the duct rises and is discharged through the distal end (for a lamp whose distal end is directed upwards). This results in the suction of fresh air near the proximal openings. This fresh air is accelerated in the duct towards the distal opening, heating up to its discharge via the distal end. Note that the air flow is substantially vertical, not radial, the air inlet is from the bottom and the outlet from the top of the lamp.
De surcroît, la lampe selon l'invention peut être utilisée dans une position inverse, c'est-à-dire ouverture distale orientée vers le bas. L'air frais est alors aspiré via l'ouverture distale, s'échauffe et accélère jusqu'à être évacué via les ouvertes proximales.  In addition, the lamp according to the invention can be used in a reverse position, that is to say distal opening oriented downwards. The fresh air is then sucked through the distal opening, warms up and accelerates until it is evacuated via the proximal openings.
On notera que la lampe selon l'invention produit un effet de tirage, donc naturel, passif. Autrement dit, la circulation d'air dans le conduit formant cheminée n'est pas réalisée par l'intermédiaire d'une convection forcée.  It will be noted that the lamp according to the invention produces a pulling effect, therefore natural, passive. In other words, the air flow in the chimney duct is not performed by means of forced convection.
Selon un mode de réalisation, le ou les modules d'éclairage comprennent des moyens de dissipation thermique en céramique.  According to one embodiment, the lighting module or modules comprise ceramic heat dissipation means.
Avantageusement, le circuit imprimé du ou de l'un des modules d'éclairage est en céramique.  Advantageously, the printed circuit of one or of one of the lighting modules is ceramic.
Selon une possibilité avantageuse, la face extérieure du circuit imprimé du ou de l'un des modules d'éclairage est recouverte au moins partiellement par un revêtement céramique.  According to an advantageous possibility, the outer face of the printed circuit of one or of one of the lighting modules is at least partially covered by a ceramic coating.
De manière avantageuse, la face extérieure du circuit imprimé du ou de l'un des modules d'éclairage est recouverte au moins partiellement par une plaque céramique rapportée et agencée en appui contre la face extérieure.  Advantageously, the outer face of the printed circuit of the or one of the lighting modules is at least partially covered by a ceramic plate attached and arranged in abutment against the outer face.
Selon une forme d'exécution, la lampe comprend plusieurs modules d'éclairage, et la lampe comprend, à l'intérieur du conduit de tirage et d'évacuation, entre les modules d'éclairage, un organe d'interposition formant obstacle à la transmission de chaleur par rayonnement de l'un des modules d'éclairage à un autre des modules d'éclairage.  According to one embodiment, the lamp comprises a plurality of lighting modules, and the lamp comprises, inside the duct for drawing and discharging, between the lighting modules, an interposing member forming an obstacle to the radiation heat transmission from one of the lighting modules to another of the lighting modules.
Avantageusement, l'organe d'interposition présente une pluralité de faces d'interposition, autant que la lampe comprend de modules d'éclairage, chaque face d'interposition étant agencée en regard et à distance de la face extérieure du circuit imprimé de l'un des modules d'éclairage. Advantageously, the interposition member has a plurality of interposition faces, as far as the lamp comprises lighting modules, each interposition face being arranged opposite and at a distance from the outer face of the printed circuit of one of the lighting modules.
De manière avantageuse, l'organe d'interposition est en plastique. Advantageously, the interposer is made of plastic.
Selon un mode de réalisation, chaque module d'éclairage comprend un cadre en appui contre le circuit imprimé, le cadre comprenant une première paroi fonctionnelle délimitant au moins partiellement le conduit, dans laquelle le cadre forme une collerette encadrant le circuit imprimé et supporte une optique, en dans laquelle le circuit imprimé est enchâssé dans le cadre. According to one embodiment, each lighting module comprises a frame bearing against the printed circuit, the frame comprising a first functional wall at least partially delimiting the conduit, in which the frame forms a flange framing the printed circuit and supports an optical , in which the printed circuit is embedded in the frame.
Selon une possibilité, chaque module d'éclairage comprend un cadre en appui contre le circuit imprimé, le cadre comprenant une première paroi fonctionnelle délimitant au moins partiellement le conduit, dans laquelle le cadre forme une collerette encadrant le circuit imprimé et supporte une optique, en dans laquelle le cadre est surmoulé sur le circuit imprimé ou soudé par ultrasons avec le circuit imprimé.  According to one possibility, each lighting module comprises a frame resting against the printed circuit, the frame comprising a first functional wall at least partially delimiting the conduit, in which the frame forms a collar flanking the printed circuit and supports an optical element, wherein the frame is overmolded on the circuit board or ultrasonically welded with the printed circuit board.
Ainsi, l'étanchéité réalisée entre l'optique et le cadre offre une absence d'opacification de l'optique, le flux d'air de refroidissement ne pénétrant pas jusqu'à l'optique.  Thus, the tightness achieved between the optics and the frame provides a lack of optical opacity, the cooling air flow does not penetrate to the optics.
Selon une caractéristique de la lampe selon un mode de réalisation de l'invention, chaque module d'éclairage comprend un cadre en appui contre le circuit imprimé, le cadre comprenant une première paroi fonctionnelle délimitant au moins partiellement le conduit.  According to a feature of the lamp according to one embodiment of the invention, each lighting module comprises a frame resting against the printed circuit, the frame comprising a first functional wall at least partially delimiting the conduit.
Selon un mode de réalisation, la base comprend au moins une cavité débouchant dans le prolongement de la ou l'une des ouvertures proximales pour augmenter le flux d'air entrant ou sortant de chaque ouverture proximale.  According to one embodiment, the base comprises at least one cavity opening in the extension of the or one of the proximal openings to increase the flow of air entering or leaving each proximal opening.
On notera qu'une cavité n'est pas un orifice débouchant, de sorte que l'air circulant via la cavité ne peut pas entrer dans la base sur laquelle cette cavité est formée, et ne peut donc pas être réchauffée par une alimentation.  It will be noted that a cavity is not an opening opening, so that the air flowing through the cavity can not enter the base on which this cavity is formed, and therefore can not be heated by a power supply.
Selon une possibilité, chaque module d'éclairage comprend un dissipateur thermique en appui contre la face intérieure du circuit imprimé.  According to one possibility, each lighting module comprises a heatsink bearing against the inner face of the printed circuit.
Avantageusement, le dissipateur thermique comprend au moins une ailette de dissipation thermique s'étendant dans le conduit selon une direction sensiblement parallèle à celle du conduit.  Advantageously, the heat sink comprises at least one heat dissipating fin extending in the conduit in a direction substantially parallel to that of the conduit.
Ainsi, les ailettes n'entravent pas l'écoulement du flux d'air dans le conduit. Selon une forme d'exécution, la lampe comprend une pluralité de modules d'éclairage. Thus, the fins do not impede the flow of air flow in the conduit. According to one embodiment, the lamp comprises a plurality of lighting modules.
De manière avantageuse, la lampe comprend au moins une entretoise agencée dans le conduit pour maintenir un écartement constant entre les modules d'éclairage.  Advantageously, the lamp comprises at least one spacer arranged in the conduit to maintain a constant spacing between the lighting modules.
Selon une caractéristique de la lampe selon un mode de réalisation de l'invention, les circuits imprimés des modules d'éclairage sont régulièrement répartis autour du conduit pour permettre un éclairage à 360° autour du conduit.  According to a characteristic of the lamp according to one embodiment of the invention, the printed circuits of the lighting modules are regularly distributed around the duct to allow 360 ° illumination around the duct.
Selon une possibilité, la lampe comprend des moyens de connexion électrique entre chaque circuit imprimé et une alimentation électrique adaptée pour alimenter les diodes électroluminescentes, les moyens de connexion électrique comprenant un circuit imprimé principal auquel est relié chaque circuit imprimé et auquel est reliée l'alimentation électrique.  According to one possibility, the lamp comprises means of electrical connection between each printed circuit and a power supply suitable for supplying the light-emitting diodes, the electrical connection means comprising a main printed circuit to which each printed circuit is connected and to which the power supply is connected. electric.
Avantageusement, la lampe comprend des moyens de fixation de chaque module d'éclairage sur la base, les moyens de fixation comprenant au moins un organe d'encliquetage et un logement conformé pour recevoir et encliqueter l'organe d'encliquetage.  Advantageously, the lamp comprises means for fixing each lighting module on the base, the fixing means comprising at least one locking member and a housing shaped to receive and snap the detent member.
D'autres caractéristiques et avantages de la présente invention ressortiront clairement de la description détaillée donnée ci-après d'un mode de réalisation de l'invention, donné à titre d'exemple non limitatif, en référence aux dessins annexés dans lesquels : Other characteristics and advantages of the present invention will emerge clearly from the detailed description given below of an embodiment of the invention, given by way of non-limiting example, with reference to the appended drawings in which:
- La figure 1 est une vue en perspective d'une lampe selon un mode de réalisation de l'invention,  FIG. 1 is a perspective view of a lamp according to one embodiment of the invention,
- La figure 2 est une vue de dessus d'une lampe selon un mode de réalisation de l'invention,  FIG. 2 is a view from above of a lamp according to one embodiment of the invention,
- La figure 3 est une vue éclatée d'une lampe selon un mode de réalisation de l'invention,  FIG. 3 is an exploded view of a lamp according to one embodiment of the invention,
- La figure 4 est une vue éclatée et de devant d'un module d'éclairage d'une lampe selon un mode de réalisation de l'invention,  FIG. 4 is an exploded and front view of a lighting module of a lamp according to one embodiment of the invention,
- La figure 5 est une vue éclatée et de derrière d'un module d'éclairage d'une lampe selon un mode de réalisation de l'invention, - la figure 6 est une vue schématique de dessus et en perspective d'une lampe selon un autre mode de réalisation de l'invention, FIG. 5 is an exploded rear view of a lighting module of a lamp according to one embodiment of the invention, FIG. 6 is a schematic view from above and in perspective of a lamp according to another embodiment of the invention,
- les figures 7 à 9 sont des vues de dessus et de côté d'une lampe selon un mode de réalisation de l'invention.  - Figures 7 to 9 are top and side views of a lamp according to one embodiment of the invention.
La figure 1 montre une lampe 1 selon un mode de réalisation de l'invention. La lampe 1 comprend une base 2 sur laquelle sont fixés un ou plusieurs modules d'éclairage 4. La lampe 1 comprend avantageusement une pluralité de modules d'éclairage 4, par exemple trois modules d'éclairage 4, comme cela est représenté sur la figure 1 . Les modules d'éclairage 4 sont agencés et conformés pour délimiter un conduit 6 destiné à la circulation de l'air ambiant entre les modules d'éclairage 4. Les modules d'éclairage 4 peuvent s'étendre de façon sensiblement parallèle les uns par rapport aux autres, comme dans l'exemple de la figure 1 . Figure 1 shows a lamp 1 according to one embodiment of the invention. The lamp 1 comprises a base 2 on which are fixed one or more lighting modules 4. The lamp 1 advantageously comprises a plurality of lighting modules 4, for example three lighting modules 4, as shown in FIG. 1. The lighting modules 4 are arranged and shaped to delimit a duct 6 intended for the circulation of the ambient air between the lighting modules 4. The lighting modules 4 can extend in a substantially parallel manner with respect to each other. to others, as in the example of Figure 1.
Le conduit 6 comprend une ouverture distale 8 et, selon le mode de réalisation illustré à la figure 1 , trois ouvertures proximales 10 localisées à proximité de la base 2. Le conduit 6 peut présenter une forme sensiblement évasée. Le conduit 6 est destiné au tirage et à l'évacuation d'air ambiant depuis les ouvertures proximales 10 vers l'extrémité distale 8, ou réciproquement si l'on inverse la lampe 1 , pour permettre le refroidissement des modules d'éclairage 4.  The duct 6 comprises a distal opening 8 and, according to the embodiment illustrated in Figure 1, three proximal openings 10 located near the base 2. The duct 6 may have a substantially flared shape. The conduit 6 is intended for drawing and evacuating ambient air from the proximal openings 10 towards the distal end 8, or conversely if the lamp 1 is reversed, to allow the lighting modules 4 to cool.
On notera que par conduit on entend un espace sensiblement longitudinal formant une cheminée destinée au tirage d'un fluide via un orifice d'entrée et à l'évacuation de ce fluide via un orifice de sortie, avec la création d'une accélération de la circulation d'air dans l'espace formant cheminée. Ainsi, le conduit 6 peut présenter des fentes latérales 12 s'élargissant vers l'ouverture distale 8 et/ou les ouvertures proximales 10, tant que les fentes latérales 12 n'impactent pas sensiblement l'effet de tirage et d'évacuation d'air à travers les ouvertures proximales 10 et l'ouverture distale 8.  Note that conduit means a substantially longitudinal space forming a chimney for drawing a fluid through an inlet and the evacuation of the fluid via an outlet, with the creation of an acceleration of the air circulation in the space forming a chimney. Thus, the duct 6 may have lateral slots 12 widening towards the distal opening 8 and / or the proximal openings 10, as long as the lateral slots 12 do not substantially affect the pulling and evacuation effect of air through the proximal openings 10 and the distal opening 8.
Comme cela est visible sur les figures 4 et 5, chaque module d'éclairage 4 comprend un circuit imprimé 14. Le circuit imprimé 14 comprend une face intérieure 16 orientée vers l'intérieur du conduit 6, et une face extérieure 18 supportant une pluralité de diodes électroluminescentes (LEDs) 20. Les LEDs 20 correspondent avantageusement à des diodes de puissance, destinées à l'éclairage d'un local. Elles peuvent présenter une puissance supérieure à 1 Watt. Comme cela est visible sur les figures, les LEDs 20 de chaque module d'éclairage 4 peuvent être alignées de manière sensiblement parallèle à la direction dans laquelle s'étend le conduit 6. As can be seen in FIGS. 4 and 5, each lighting module 4 comprises a printed circuit 14. The printed circuit 14 comprises an inner face 16 directed towards the inside of the conduit 6, and an outer face 18 supporting a plurality of light emitting diodes (LEDs) 20. The LEDs 20 advantageously correspond to power diodes for lighting a room. They can have a power greater than 1 Watt. As can be seen in the figures, the LEDs 20 of each lighting module 4 can be aligned substantially parallel to the direction in which the duct 6 extends.
La base 2 peut comprendre un logement intérieur 22 contenant une alimentation électrique 24. L'alimentation électrique 24 est adaptée pour alimenter les LEDs 20.  The base 2 may comprise an inner housing 22 containing a power supply 24. The power supply 24 is adapted to power the LEDs 20.
Comme cela est visible sur la figure 3, la base 2 peut comprendre une portion principale 26, dans laquelle peut être ménagé le logement intérieur 22, et une portion secondaire 28 formant couvercle fixée sur la portion principale 26. Les modules d'éclairage 4 peuvent être fixés sur la portion secondaire 28 de la base 2.  As can be seen in FIG. 3, the base 2 can comprise a main portion 26, in which the inner housing 22 can be formed, and a secondary portion 28 forming a lid fixed on the main portion 26. The lighting modules 4 can to be fixed on the secondary portion 28 of the base 2.
Comme cela est illustré aux figures 1 et 3, la base 2 comprend avantageusement des cavités 30 conformées pour augmenter le flux d'air entrant ou sortant par les ouvertures proximales 10. Les ouvertures proximales 10 débouchent de manière avantageuse sur les cavités 30.  As illustrated in FIGS. 1 and 3, the base 2 advantageously comprises cavities 30 shaped to increase the inflow or outflow of air through the proximal openings 10. The proximal openings 10 advantageously open out onto the cavities 30.
La lampe 1 peut comprendre des moyens de raccordement électrique à un réseau électrique local, par exemple un culot 32. Le culot 32 est par exemple rattaché à la portion principale 26. Le conduit 6 peut s'étendre selon une direction sensiblement parallèle à celle dans laquelle s'étend le culot 32. Les modules d'éclairage 4 peuvent aussi s'étendre dans une direction sensiblement parallèle à celle dans laquelle s'étend le culot 32.  The lamp 1 can comprise means of electrical connection to a local electrical network, for example a base 32. The base 32 is for example attached to the main portion 26. The conduit 6 can extend in a direction substantially parallel to that in which extends the base 32. The lighting modules 4 can also extend in a direction substantially parallel to that in which the base 32 extends.
Les circuits imprimés 14 peuvent être régulièrement répartis autour du conduit 6 pour que les LEDs 20 éclairent radialement à 360° autour du conduit 6. Ainsi, la normale à chaque face extérieure 18 peut s'étendre selon une direction sensiblement radiale. Dans l'exemple de réalisation des figures 1 à 5, les modules d'éclairage 4 sont équirépartis autour du conduit 6, tous les 120° environ.  The printed circuits 14 may be evenly distributed around the duct 6 so that the LEDs 20 radiate 360 ° radially around the duct 6. Thus, the normal to each outer face 18 may extend in a substantially radial direction. In the embodiment of Figures 1 to 5, the lighting modules 4 are evenly distributed around the duct 6, every 120 °.
Chaque module d'éclairage 4 peut comprendre un dissipateur thermique 34 en appui contre la face intérieure 16 du circuit imprimé 14. Ainsi, le dissipateur thermique 34 est localisé dans le conduit 6. Le dissipateur thermique 34 peut comprendre une pluralité d'ailettes 36 destinées à accroître la surface d'échange thermique. Les ailettes 36 s'étendent dans le conduit 6. Chaque ailette 36 peut avantageusement s'étendre selon une direction sensiblement parallèle à celle dans laquelle s'étend le conduit 6, pour ne pas entraver le flux d'air circulant dans le conduit 6. Each lighting module 4 may comprise a heat sink 34 resting against the inner face 16 of the printed circuit 14. Thus, the heat sink 34 is located in the duct 6. The heat sink 34 may comprise a plurality of fins 36 intended to increase the heat exchange surface. The fins 36 extend in the duct 6. Each fin 36 may advantageously extend in one direction substantially parallel to that in which the duct 6 extends, so as not to hinder the flow of air flowing in the duct 6.
La lampe 1 peut également comprendre une entretoise 38. L'entretoise 38 est ici agencée dans le conduit 6 pour maintenir un écartement constant entre les modules d'éclairage 4. Dans l'exemple de la figure 2, l'entretoise 38 correspond à un organe multipode, tripode en l'occurrence (car la lampe 1 selon le mode de réalisation des figures 1 à 5 comprend trois modules d'éclairage 4). L'entretoise 38 comprend donc ici trois pieds 40, chaque pied 40 étant en appui contre l'un des modules d'éclairage 4. Les pieds 40 peuvent être en appui contre le dissipateur thermique 34 de chaque module d'éclairage 4.  The lamp 1 may also comprise a spacer 38. The spacer 38 is here arranged in the duct 6 to maintain a constant spacing between the lighting modules 4. In the example of Figure 2, the spacer 38 corresponds to a multipode member, tripod in this case (because the lamp 1 according to the embodiment of Figures 1 to 5 comprises three lighting modules 4). The spacer 38 thus comprises here three feet 40, each leg 40 being in abutment against one of the lighting modules 4. The feet 40 can bear against the heat sink 34 of each lighting module 4.
Chaque module d'éclairage 4 comprend un cadre 42 formant collerette encadrant le circuit imprimé 14. Le cadre 42 est en appui contre la face extérieure 18 du circuit imprimé 14.  Each lighting module 4 comprises a frame 42 forming a collar flanking the printed circuit 14. The frame 42 bears against the outer face 18 of the printed circuit 14.
Le cadre 42 comprend une première paroi fonctionnelle 44 conformée pour délimiter au moins partiellement le conduit 6. La première paroi fonctionnelle 44 s'étend en périphérie du circuit imprimé 14 ; elle entoure le circuit imprimé 14.  The frame 42 comprises a first functional wall 44 shaped to at least partially delimit the duct 6. The first functional wall 44 extends at the periphery of the printed circuit 14; it surrounds the printed circuit 14.
Le circuit imprimé 14 est avantageusement enchâssé dans le cadre 42. Le cadre 42 peut être surmoulé sur le circuit imprimé 14, ou surmoulé le cas échéant sur l'ensemble formé par le circuit imprimé 14 et le dissipateur thermique 34. Alternativement, le cadre 42 peut être soudé par ultrasons avec le circuit imprimé 14.  The printed circuit 14 is advantageously encased in the frame 42. The frame 42 may be overmoulded on the printed circuit 14, or overmolded if necessary on the assembly formed by the printed circuit 14 and the heat sink 34. Alternatively, the frame 42 can be ultrasonically welded with the printed circuit board 14.
Comme cela est visible sur les figures 4 et 5, le cadre 42 peut comprendre deux parties 46, 48 entre lesquelles est agencé le circuit imprimé As can be seen in FIGS. 4 and 5, the frame 42 may comprise two parts 46, 48 between which the circuit board is arranged.
14, l'une en appui contre la face intérieure 16 du circuit imprimé 14, l'autre en appui contre la face extérieure 18 du circuit imprimé 14. 14, one bearing against the inner face 16 of the printed circuit 14, the other bearing against the outer face 18 of the printed circuit 14.
Conformément aux figures 4 et 5, le cadre 42 est en appui contre la face extérieure 18 du circuit imprimé 14. Le cadre 42 comprend avantageusement une pluralité d'ouvertures 50, chaque ouverture 50 étant destinée à recevoir une des LEDs 20.  According to FIGS. 4 and 5, the frame 42 bears against the outer face 18 of the printed circuit 14. The frame 42 advantageously comprises a plurality of openings 50, each opening 50 being intended to receive one of the LEDs 20.
Le cadre 42 peut aussi comprendre une deuxième paroi fonctionnelle 52 s'étendant autour des LEDs 20. La deuxième paroi fonctionnelle 52 est avantageusement réfléchissante, par exemple revêtue d'une couche d'un matériau réfléchissant. Elle peut être concave, comme dans l'exemple des figures 4 et 5. Chaque module d'éclairage 4 peut comprendre une optique 54 supportée par exemple par le cadre 42. The frame 42 may also include a second functional wall 52 extending around the LEDs 20. The second functional wall 52 is advantageously reflective, for example coated with a layer of a reflective material. It can be concave, as in the example of Figures 4 and 5. Each lighting module 4 may comprise an optic 54 supported for example by the frame 42.
Selon une possibilité, le cadre 42 peut être collé à la base 2, notamment à la portion secondaire 28 de la base 2.  According to one possibility, the frame 42 can be glued to the base 2, in particular to the secondary portion 28 of the base 2.
La lampe 1 comprend des moyens de connexion électrique entre chaque circuit imprimé 14 et l'alimentation électrique 24 incluse dans la base 2. Les moyens de connexion électrique comprennent un circuit imprimé principal 56 relié à l'alimentation électrique 24. Des moyens d'enfichage, comme des broches 58 et des trous 60 ménagés dans le circuit imprimé principal 56 et destinés à recevoir les broches 58, autorisent la connexion électrique entre chaque circuit imprimé 14 et le circuit électrique principal 56.  The lamp 1 comprises means of electrical connection between each printed circuit 14 and the power supply 24 included in the base 2. The electrical connection means comprise a main printed circuit 56 connected to the power supply 24. Plug-in means , like pins 58 and holes 60 formed in the main printed circuit 56 and intended to receive the pins 58, allow the electrical connection between each printed circuit 14 and the main electrical circuit 56.
La lampe 1 comprend aussi des moyens de fixation de chaque module d'éclairage 4 sur la base 2. Les moyens de fixation comprennent par exemple au moins un organe d'encliquetage 62 déformable s'étendant depuis une portion inférieure 64 du cadre 42, et un logement 66 destiné à recevoir la portion inférieure 64 du cadre 42 et conformé pour réaliser l'encliquetage du module d'éclairage 4 sur la base 2 lorsque l'organe d'encliquetage 62 est inséré dans le logement 66. Le logement 66 peut être ménagé sur la portion secondaire 28 de la base 2. Il peut avantageusement déboucher sur le circuit imprimé principal 56 pour permettre la connexion électrique entre chaque circuit imprimé 14 et le circuit imprimé principal 56.  The lamp 1 also comprises means for fixing each lighting module 4 on the base 2. The fixing means comprise, for example, at least one deformable locking member 62 extending from a lower portion 64 of the frame 42, and a housing 66 for receiving the lower portion 64 of the frame 42 and shaped to engage the lighting module 4 on the base 2 when the detent member 62 is inserted into the housing 66. The housing 66 may be provided on the secondary portion 28 of the base 2. It may advantageously lead to the main printed circuit 56 to allow the electrical connection between each printed circuit 14 and the main printed circuit 56.
Selon une forme d'exécution dans laquelle la lampe 1 comprend plusieurs modules d'éclairage 4, par exemple trois comme illustré à la figure 6, chaque module d'éclairage 4 comprend, au lieu d'un dissipateur thermique 34, une plaque 67 céramique agencée en appui contre la face 18 extérieure du circuit imprimé 14 correspondant. Chaque circuit imprimé 14 peut lui-même être en matériau céramique, ou la face extérieure 18 de chaque circuit imprimé 14 peut comprendre un revêtement céramique.  According to one embodiment in which the lamp 1 comprises several lighting modules 4, for example three as illustrated in FIG. 6, each lighting module 4 comprises, instead of a heat sink 34, a ceramic plate 67 arranged in abutment against the outer face 18 of the corresponding printed circuit 14. Each printed circuit board 14 may itself be made of ceramic material, or the outer face 18 of each printed circuit 14 may comprise a ceramic coating.
L'utilisation de céramique limite le réchauffement de l'un des modules d'éclairage 4 par les modules d'éclairage 4 adjacents. Il en résulte un refroidissement thermique plus efficace.  The use of ceramic limits the heating of one of the lighting modules 4 by the adjacent lighting modules 4. This results in more efficient thermal cooling.
La plaque céramique, ou la face extérieure 18 en céramique ou supportant un revêtement céramique est avantageusement plane. Elle est dépourvue d'ailettes s'étendant à l'intérieur du conduit.  The ceramic plate, or the outer face 18 made of ceramic or supporting a ceramic coating is advantageously flat. It is devoid of fins extending inside the conduit.
De manière avantageuse, un organe 68 d'interposition peut être agencé dans le conduit, entre les modules d'éclairage 4 et notamment à distance des modules d'éclairage 4, pour limiter la transmission de chaleur par rayonnement entre les modules d'éclairage 4 adjacents. Advantageously, an interposition member 68 may be arranged in the duct, between the lighting modules 4 and in particular at distance of the lighting modules 4, to limit the radiation heat transmission between the adjacent lighting modules 4.
Comme on peut le voir sur la figure 6, l'organe 68 d'interposition peut s'étendre longitudinalement dans le conduit. Il peut présenter une forme triangulaire, et plusieurs faces 70, autant que la lampe 1 comprend de modules d'éclairage 4, en l'occurrence trois, chaque face 70 étant agencée en regard et à distance de la face extérieure 18 de l'un des circuits imprimés 14. Les faces 70 peuvent être sensiblement parallèles à la face extérieure 18 à laquelle elles font face. L'organe 68 d'interposition peut correspondre à une pièce plastique, donc thermiquement peu conductrice.  As can be seen in Figure 6, the interposition member 68 may extend longitudinally in the conduit. It may have a triangular shape, and several faces 70, as far as the lamp 1 comprises lighting modules 4, in this case three, each face 70 being arranged opposite and at a distance from the outer face 18 of one The faces 70 may be substantially parallel to the outer face 18 to which they face. The interposition member 68 may correspond to a plastic part, which is thermally non-conductive.
Bien entendu, l'invention n'est nullement limitée au mode de réalisation décrit ci-dessus, ce mode de réalisation n'ayant été donné qu'à titre d'exemple. Des modifications restent possibles, notamment du point de vue de la constitution des divers éléments ou par la substitution d'équivalents techniques, sans sortir pour autant du domaine de protection de l'invention.  Of course, the invention is not limited to the embodiment described above, this embodiment having been given as an example. Modifications are possible, particularly 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.
Ainsi, la lampe 1 peut comprendre plus ou moins que trois modules d'éclairage 4.  Thus, the lamp 1 may comprise more or less than three lighting modules 4.
Ainsi, le conduit 6 peut être dépourvu de fentes latérales 12 séparant les modules d'éclairage 4, de sorte que les modules d'éclairage 4 sont reliés les uns aux autres.  Thus, the duct 6 may be devoid of lateral slots 12 separating the lighting modules 4, so that the lighting modules 4 are connected to each other.
Ainsi, le ou les modules d'éclairage 4, et en particulier leur optique 54 et leur cadre 42, peuvent être conformés pour former ensemble une sphère, comme illustré sur les figures 7 à 9.  Thus, the lighting module or modules 4, and in particular their optics 54 and their frame 42, may be shaped together to form a sphere, as illustrated in FIGS. 7 to 9.

Claims

REVENDICATIONS
1 . Lampe (1 ) à diode électroluminescente, caractérisée en ce que la lampe (1 ) comprend une base (2) supportant au moins un module d'éclairage (4), le ou les modules d'éclairage (4) délimitant au moins un conduit (6) de tirage et d'évacuation d'air comprenant au moins une ouverture proximale (10) localisée à proximité de la base (2) et adaptée pour l'introduction d'air dans le conduit (6) ou l'évacuation d'air hors du conduit (6), et au moins une ouverture distale (8) opposée à la ou les ouvertures proximales (10) et adaptée pour l'évacuation d'air hors du conduit (6) ou l'introduction d'air dans le conduit (6), chaque module d'éclairage (4) comprenant au moins un circuit imprimé (14) avec une face extérieure (18) supportant au moins une diode électroluminescente (20) et une face intérieure (16) orientée vers le conduit (6), en vue de générer un effet de circulation d'air dans le conduit (6) contribuant au refroidissement du ou des circuits imprimés (14). 1. Light-emitting diode lamp (1), characterized in that the lamp (1) comprises a base (2) supporting at least one lighting module (4), the lighting module or modules (4) delimiting at least one duct (6) for drawing and exhausting air comprising at least one proximal opening (10) located near the base (2) and adapted for the introduction of air into the duct (6) or the evacuation of air out of the conduit (6), and at least one distal opening (8) opposite to the proximal opening (10) and adapted for exhausting air from the conduit (6) or introducing air in the conduit (6), each illumination module (4) comprising at least one printed circuit (14) with an outer face (18) supporting at least one light-emitting diode (20) and an inner face (16) facing the conduit (6), for generating an air circulation effect in the conduit (6) contributing to the cooling of the printed circuit (s) (14).
2. Lampe (1 ) selon la revendication 1 , caractérisée en ce que le ou les modules d'éclairage (4) comprennent des moyens de dissipation thermique en céramique. 2. Lamp (1) according to claim 1, characterized in that the lighting module or modules (4) comprise ceramic heat dissipation means.
3. Lampe (1 ) selon la revendication 2, caractérisée en ce que le circuit imprimé (14) du ou de l'un des modules d'éclairage (4) est en céramique. 3. Lamp (1) according to claim 2, characterized in that the printed circuit (14) of one or one of the lighting modules (4) is ceramic.
4. Lampe (1 ) selon la revendication 2 ou 3, caractérisée en ce que la face extérieure (18) du circuit imprimé (14) du ou de l'un des modules d'éclairage (4) est recouverte au moins partiellement par un revêtement céramique. 4. Lamp (1) according to claim 2 or 3, characterized in that the outer face (18) of the printed circuit (14) of the or one of the lighting modules (4) is covered at least partially by a ceramic coating.
5. Lampe (1 ) selon l'une des revendications 2 à 4, caractérisée en ce que la face extérieure (18) du circuit imprimé (14) du ou de l'un des modules d'éclairage (4) est recouverte au moins partiellement par une plaque (67) céramique rapportée et agencée en appui contre la face extérieure (18). 5. Lamp (1) according to one of claims 2 to 4, characterized in that the outer face (18) of the printed circuit (14) of the or one of the lighting modules (4) is covered at least partially by a plate (67) ceramic reported and arranged in abutment against the outer face (18).
6. Lampe (1 ) selon l'une des revendications 1 à 5, caractérisée en ce que la lampe (1 ) comprend plusieurs modules d'éclairage (4), et en ce que la lampe (1 ) comprend, à l'intérieur du conduit (6) de tirage et d'évacuation, entre les modules d'éclairage (4), un organe (68) d'interposition formant obstacle à la transmission de chaleur par rayonnement de l'un des modules d'éclairage (4) à un autre des modules d'éclairage (4). 6. Lamp (1) according to one of claims 1 to 5, characterized in that the lamp (1) comprises a plurality of lighting modules (4), and in that the lamp (1) comprises, inside the duct (6) for drawing and discharging, between the lighting modules (4), an interposing member (68) forming an obstacle to the radiation heat transmission from one of the lighting modules (4) to another of the lighting modules (4).
7. Lampe (1 ) selon la revendication 6, caractérisée en ce que l'organe (68) d'interposition présente une pluralité de faces (70) d'interposition, autant que la lampe (1 ) comprend de modules d'éclairage (4), chaque face (70) d'interposition étant agencée en regard et à distance de la face extérieure (18) du circuit imprimé (14) de l'un des modules d'éclairage (4). 7. Lamp (1) according to claim 6, characterized in that the member (68) interposition has a plurality of faces (70) of interposition, as far as the lamp (1) comprises of lighting modules ( 4), each face (70) of interposition being arranged opposite and at a distance from the outer face (18) of the printed circuit (14) of one of the lighting modules (4).
8. Lampe (1 ) selon la revendication 6 ou 7, caractérisée en ce que l'organe (68) d'interposition est en plastique. 8. Lamp (1) according to claim 6 or 7, characterized in that the member (68) of interposition is plastic.
9. Lampe (1 ) selon l'une des revendications 1 à 8, caractérisée en ce que chaque module d'éclairage (4) comprend un cadre (42) en appui contre le circuit imprimé (14), le cadre (42) comprenant une première paroi fonctionnelle (44) délimitant au moins partiellement le conduit (6), dans laquelle le cadre (42) forme une collerette encadrant le circuit imprimé (14) et supporte une optique (54), en dans laquelle le circuit imprimé (14) est enchâssé dans le cadre (42). 9. Lamp (1) according to one of claims 1 to 8, characterized in that each lighting module (4) comprises a frame (42) bearing against the printed circuit (14), the frame (42) comprising a first functional wall (44) at least partially delimiting the conduit (6), in which the frame (42) forms a collar flanking the printed circuit (14) and supports an optic (54), in which the printed circuit (14) ) is embedded in the frame (42).
10. Lampe (1 ) selon l'une des revendications 1 à 8, caractérisée en ce que chaque module d'éclairage (4) comprend un cadre (42) en appui contre le circuit imprimé (14), le cadre (42) comprenant une première paroi fonctionnelle (44) délimitant au moins partiellement le conduit (6), dans laquelle le cadre (42) forme une collerette encadrant le circuit imprimé (14) et supporte une optique (54), en dans laquelle le cadre (42) est surmoulé sur le circuit imprimé (14) ou soudé par ultrasons avec le circuit imprimé (14). 10. Lamp (1) according to one of claims 1 to 8, characterized in that each lighting module (4) comprises a frame (42) bearing against the printed circuit (14), the frame (42) comprising a first functional wall (44) at least partially delimiting the duct (6), in which the frame (42) forms a flange framing the printed circuit (14) and supports an optic (54), in which the frame (42) is molded on the circuit board (14) or ultrasonically welded with the printed circuit (14).
1 1 . Lampe (1 ) selon l'une des revendications 1 à 10, caractérisée en ce que la base (2) comprend au moins une cavité (30) débouchant dans le prolongement de la ou l'une des ouvertures proximales (10) pour augmenter le flux d'air entrant ou sortant de chaque ouverture proximale (10). 1 1. Lamp (1) according to one of claims 1 to 10, characterized in that the base (2) comprises at least one cavity (30) opening in the extension of the or one of the proximal openings (10) to increase the airflow into or out of each proximal opening (10).
12. Lampe (1 ) selon l'une des revendications 1 à 1 1 , caractérisée en ce que chaque module d'éclairage (4) comprend un dissipateur thermique (34) en appui contre la face intérieure (16) du circuit imprimé (14). 12. Lamp (1) according to one of claims 1 to 1 1, characterized in that each lighting module (4) comprises a heat sink (34) bearing against the inner face (16) of the printed circuit (14). ).
13. Lampe (1 ) selon la revendication 12, caractérisée en ce que le dissipateur thermique (34) comprend au moins une ailette (36) de dissipation thermique s'étendant dans le conduit (6) selon une direction sensiblement parallèle à celle du conduit (6). 13. Lamp (1) according to claim 12, characterized in that the heat sink (34) comprises at least one fin (36) of heat dissipation extending in the conduit (6) in a direction substantially parallel to that of the conduit (6).
14. Lampe (1 ) selon l'une des revendications 1 à 13, caractérisée en ce que la lampe (1 ) comprend une pluralité de modules d'éclairage (4). 14. Lamp (1) according to one of claims 1 to 13, characterized in that the lamp (1) comprises a plurality of lighting modules (4).
15. Lampe (1 ) selon la revendication 14, caractérisée en ce que la lampe (1 ) comprend au moins une entretoise (38) agencée dans le conduit (6) pour maintenir un écartement constant entre les modules d'éclairage (4). 15. Lamp (1) according to claim 14, characterized in that the lamp (1) comprises at least one spacer (38) arranged in the conduit (6) to maintain a constant spacing between the lighting modules (4).
16. Lampe (1 ) selon la revendication 14 ou 15, caractérisée en ce que les circuits imprimés (14) des modules d'éclairage (4) sont régulièrement répartis autour du conduit (6) pour permettre un éclairage à 360° autour du conduit (6). 16. Lamp (1) according to claim 14 or 15, characterized in that the printed circuits (14) of the lighting modules (4) are regularly distributed around the conduit (6) to allow 360 ° illumination around the conduit (6).
17. Lampe (1 ) selon l'une des revendications 1 à 16, caractérisée en ce que la lampe (1 ) comprend des moyens de connexion électrique entre chaque circuit imprimé (14) et une alimentation électrique (24) adaptée pour alimenter les diodes électroluminescentes (20), les moyens de connexion électrique comprenant un circuit imprimé principal (56) auquel est relié chaque circuit imprimé (14) et auquel est reliée l'alimentation électrique (24). 17. Lamp (1) according to one of claims 1 to 16, characterized in that the lamp (1) comprises means for electrical connection between each printed circuit (14) and a power supply (24) adapted to supply the diodes electroluminescent means (20), the electrical connection means comprising a main printed circuit (56) to which each printed circuit (14) is connected and to which the power supply (24) is connected.
18. Lampe (1 ) selon l'une des revendications 1 à 17, caractérisée en ce que la lampe (1 ) comprend des moyens de fixation de chaque module d'éclairage (4) sur la base (2), les moyens de fixation comprenant au moins un organe d'encliquetage (62) et un logement (66) conformé pour recevoir et encliqueter l'organe d'encliquetage (62). 18. Lamp (1) according to one of claims 1 to 17, characterized in that the lamp (1) comprises means for fixing each lighting module (4) on the base (2), the fixing means comprising at least one detent member (62) and a housing (66) shaped to receive and snap the detent member (62).
EP13719953.5A 2012-04-03 2013-03-29 Light-emitting diode lamp Withdrawn EP2834558A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1253046A FR2988811B1 (en) 2012-04-03 2012-04-03 ELECTROLUMINESCENT DIODE LAMP
PCT/FR2013/050702 WO2013150227A1 (en) 2012-04-03 2013-03-29 Light-emitting diode lamp

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