WO2008125772A1

WO2008125772A1 - Led lighting device

Info

Publication number: WO2008125772A1
Application number: PCT/FR2008/050369
Authority: WO
Inventors: Michel Petit; Stéphane URRUTIA; Jean-Marc Bernex
Original assignee: Lyracom
Priority date: 2007-03-08
Filing date: 2008-03-04
Publication date: 2008-10-23
Also published as: PL2129963T3; ATE535757T1; EP2129963A1; ES2378427T3; EP2129963B1

Abstract

The invention relates to a LED lighting device that comprises several LEDs (18) attached on at least one bearing platen (20) and arranged in lines and columns, a bearing block including a housing (36) in which at least one said bearing platen (20) is provided, a means (44) for dissipating the heat provided at the other face of the plate (48) of the bearing block (22), and means (24) for processing the light rays from the LEDS and including a concentration means ((56), a reflection means (74) for directing the light rays and refraction means (76), the concentration means (56) including a concentrator for each LED, said housing (36) being blocked by the refraction means (76), the reflection means (74) being separate from the refraction means (76), wherein the LED lighting device is characterised in that the reflection means (74) include V shape mirrors in which the tip of the V is oriented towards the LEDs, with a substantially continuous V-shaped mirror above each LED column.

Description

LED LIGHTING DEVICE

The present invention relates to an LED lighting device. A lighting device intended for public lighting, or more generally for outdoor lighting, generally comprises a lamp mounted in a lantern fixed to the upper end of a mast or on a support situated at a sufficient height.

This type of lighting must meet standards concerning the quality of the lighting, particularly in terms of luminous flux, luminance, area of the illuminated area, uniformity of luminance on said area and dazzling of the source . For example, a lighting device intended for street lighting must illuminate a substantially rectangular surface on the ground of approximately 24 meters by 6 meters, with illumination greater than 10 lux, for example, and a relatively high luminance. homogeneous on said zone. Current lamp-type lighting devices consume a lot of energy for medium lighting quality and high maintenance costs.

LED lighting devices are nowadays considered as an advantageous alternative in terms of lowering electrical energy consumption and increasing the lifetime of said device. Moreover, an LED lighting device is intended to obtain a precision of illumination with a controlled amount of light.

However, the use of LEDs for lighting can be problematic for the following reasons: An LED has a large angle of illumination, which causes a wide diffusion and many losses in an application to illuminate an area remote from said LED. Also, the LED is generally associated with concentration means for gathering the light rays in a beam of maximum light intensity oriented towards the target to be illuminated.

According to another problem, an LED has a relatively low luminous power, so that it is necessary to associate several LEDs in order to obtain a luminous power substantially equivalent to that of a lighting device using a lamp. When several LEDs are associated they are grouped in the form of bars or light spots generally comprising three LEDs.

Given these constraints, LED lighting devices are generally used for directional lighting to illuminate a small area in the manner of a projector illuminating a performance stage. There are LED lighting devices for public lighting with LEDs or LED strips reported on supports for directing the LED light beams towards an area to be illuminated. For example, there is known a first lighting device of the prior art, described in the international application WO-98/33007, comprising several LEDs and means for processing the light rays emitted by said LEDs. In order to distribute the LED light beams as closely as possible in the area to be illuminated, this document proposes an arrangement of the LEDs in different directions on an inclined support and provides processing means comprising concentration means and refraction means dedicated to each LED. .

A second lighting device of the prior art, described in the international application WO-02/076788, comprises several LEDs, a curved support comprising a location for each of the LEDs, and processing means light rays emitted by the LEDs comprising a reflection and refraction device dedicated to each LED.

The arrangement of LEDs according to different directions proposed in these two devices of the prior art leads to a poorly optimized assembly. Indeed, in these two documents of the prior art, the orientation of the light beams of the LEDs in the direction to be illuminated is obtained by virtue of an arrangement of said LEDs on a support having inclined surfaces between them or curves, these relatively complex designs. a support do not facilitate its realization and its cooling. Moreover, and despite the designs of the LED supports, the discrete treatment of the light beams emitted by each of the LEDs proposed in these two documents of the prior art generates a non-homogeneous luminance on the area to be illuminated, the light task thus realized being likely to be composed of several areas of high brightness. A third device of the prior art, described in the document US-2004/0174706, comprises a plane support of several LEDs arranged in a matrix manner and means for processing the light beams emitted by the LEDs, said processing means comprise means reflection in the form of inclined blades separating the LED columns and refraction means superimposed on said reflection means.

The treatment of the light beams of the LEDs proposed in this document US-2004/0174706 does not provide a uniform luminance lighting because it is a treatment of LED beam light beam orientation likely to lead to a luminous task composed of bands of variable brightness.

Given all these disadvantages, the use of LEDs for public lighting remains marginal. Also, the present invention aims to overcome the disadvantages of the prior art by providing an LED lighting device more particularly for outdoor lighting, simple design and to obtain a uniform luminance illumination area. For this purpose, the invention relates to an LED lighting device, more particularly adapted for outdoor lighting, comprising a plurality of LEDs on at least one support plate arranged in rows and columns, a support block comprising a plate one of whose faces forms the substantially plane bottom of a housing in which is placed said at least one substantially flat support plate so as to cooperate closely with the bottom of the housing, heat dissipation means provided at the level of the other face of the plate of the support block, and means for processing the light rays emitted by the LEDs comprising concentrating means, reflection means for orienting the light rays to obtain a desired illumination zone and refraction means for optimizing the transmission of light rays to the outside by limiting the parasitic reflections of the light rays towards the inside of the d ispositif, the concentrating means being constituted for each LED of a concentrator, said housing containing said support plate being closed by the refraction means, the LED lighting device comprising reflection means, distinct from the refraction means, characterized in that the reflection means comprise V-shaped mirrors whose tip of the V is oriented towards the LEDs, a V-shaped mirror which is substantially continuous at the base of each column of LEDs. Other features and advantages will become apparent from the following description of the invention, a description given by way of example only, with reference to the appended drawings in which:

FIG. 1 is a representation of a lantern of illumination, FIG. 2 is a representation of an LED lighting device according to the invention adapted to an existing lantern of lighting,

FIG. 3 is a representation of an exploded view of an LED lighting device according to a variant of the invention, FIG. 4 is a representation of a power / life curve of an LED. ,

FIG. 5 is a schematic side sectional representation of the LED lighting device shown in FIG. 3;

FIG. 6 is a representation of the concentration means of the optical element of the LED lighting device according to a variant of the invention,

FIG. 7 is a representation of the orientation means of the optical element of the LED lighting device according to a variant of the invention, FIG. 8 is a sectional representation of the concentration and orientation means illustrated. in FIGS. 6 and 7,

FIG. 9 is a side view of another variant of the lighting device according to the invention,

FIG. 10 is a perspective view illustrating the different parts of the lighting device of FIG. 9,

FIG. 11 is a section illustrating in detail the treatment of the light rays coming from the LEDs of the device illustrated in FIGS. 9 and 10,

FIG. 12 is a schematic representation illustrating the illumination on the ground obtained from the device of FIG. 9; FIG. 13 is a schematic representation of the implantation of

LED according to a preferred embodiment, FIG. 14 is a sectional view schematically illustrating the lighting device according to the invention, and - Figure 15 is a section illustrating the orientation of the light rays emitted by an LED.

In Figure 1, there is shown by way of illustration a lighting lantern 10 may be reported on a candelabrum against the facade of a building or other lighting medium. This lantern 10 comprises a frame 12 on which is fixed a shell 14, at least a portion, generally the lower part, is open or substantially transparent so as to let the light provided by a lighting device or lamp located at the The description will now be made for an LED lighting device 16 according to a variant of the invention, capable of being arranged in a lighting lantern 10 more particularly intended for external lighting, especially a public place such as a road or a street. This application, represented in FIG. 2, is in no way limiting to the possibilities of using an LED lighting device according to the invention.

As illustrated in FIG. 3, an LED lighting device 16 comprises several LEDs 18 attached to at least one support plate 20 placed between a support block 22 and means 24 for processing the light beams emitted by the LEDs, the LEDs 18 being provided to provide a light output at least equivalent to that provided by existing lighting devices.

The LEDs 18 of the lighting device 16 are LEDs of power between 1 and 5 W to give an order of ideas. These values are in no way limiting. Advantageously, the LEDs 18 of the lighting device 16 are used at half their maximum power of use. Thus, as illustrated in FIG. 4 representing a power / life curve of an LED, the LEDs 18 are likely to offer a longer life, such as a service life of about 50,000 hours corresponding to example to the specifications demanding a public lighting project. Preferably, the plurality of LEDs 18 of the lighting device 16 are connected in series so as to simplify the regulation of their power supply, said device 16 being powered by a mains voltage in most lighting applications of an object. or a place. However, parallel editing could be considered.

The support plate 20 is in the form of a plate of a printed circuit on one of the faces of which are reported the LEDs. According to a preferred embodiment, illustrated in FIG. 14, the LEDs as well as all the components (represented in the form of at least one module 26 in FIG. 14) notably ensuring the power supply and management function of the LEDs. are attached to one of the faces of a flat support plate. According to another variant, the support plate 20 may comprise only the LEDs on one of its faces, the components providing, in particular, the power supply and LED management function being grouped together in the form of at least one implanted module 26. in another area of the device, for example at the rear of the support block.

According to a preferred embodiment, the supply and management of the LEDs can be carried out according to the assembly and with the components detailed in the French patent application No. 06 52033. Nevertheless, other solutions are possible. The LEDs 18 can be implanted inside the device in the form of an LED matrix (L1, L2 Li Ln).

The present invention is not limited to this LED arrangement, said LEDs being able to be arranged according to other arrangements. Thus, the LEDs may not be aligned but arranged along curves. In Figure 13, there is shown an implementation of LEDs to improve lighting, especially when it is suitable for a road. The LEDs are arranged along substantially rectilinear lines 28, parallel to a first axis 30 corresponding to the direction of the largest dimension of the zone. illuminated on the ground, and along substantially symmetrical columns 32 along a median axis 34 (substantially perpendicular to the first axis 30), certain columns 32 having a radius of curvature tending to distance the LEDs from the median axis 34 as and when they move away from the first axis 30. Advantageously, the radius of curvature of the columns 32 decreases as a function of the spacing between the column and the median axis 34.

For example, the LEDs are arranged in seven rows and eight columns. According to a preferred embodiment of the invention, the LEDs are spaced apart by a step of the order of 20 millimeters between lines and between columns. This pitch of 20 mm between LEDs advantageously decreases the size thus favoring the adaptation of the lighting device 16 to an existing lantern 10. However, this is a minimal step in order to ensure a compromise between the gain in space and too close proximity of the LEDs 18 which would disadvantageously favor their rise in temperature. In order to be disposed in a shell 14 of an existing lantern 10 and as illustrated in FIG. 5, the device 16 according to the invention comprises a support block 22 having fastening means on said shell 14 or directly on a frame 12 to which is attached the lantern 10 lighting. These fixing means of the support block 22 are not detailed here because they can be in many forms and are known to those skilled in the art.

According to another variant, the lighting device forms a lantern as illustrated in Figures 9, 10 and 14. In this case, the lighting device of the invention comes instead of existing lanterns. According to the invention, whatever the variant, the support block 22 comprises a housing 36 provided for receiving at least one LED support plate 20, said housing being closed by the means 24 for processing the light rays emitted by the LEDs. This housing 36 is substantially parallelepipedic and of sufficient depth to accommodate the superposition of at least one platinum support 20 of LEDs and means 24 for processing the light rays emitted by the LEDs. This housing 36 comprises side walls 38 and a bottom 40. The bottom 40 is substantially flat to cooperate closely with said at least one support plate 20 also flat to ensure efficient heat transfer between the support plate 20 and the support block 22 .

The support plate 24 of LED is fixed on the bottom 40 by fastening means such as fixing screws. Advantageously, conduction means 42 can be provided to efficiently transfer the heat dissipated by the LEDs to the support block 22. These heat conduction means 42, interposed between a support plate 20 and the support block 22, can be produced by a thermally conductive but electrically insulating film. The fixing means of the support plate 20, substantially compressing the heat conduction means 42, optimum transfer of the heat generated by the LEDs to the support block 22 is ensured. In order to evacuate the heat produced by the LEDs 18 and transmitted to the support block 20, the lighting device 16 according to the invention has static heat dissipation means 44 and means for generating a forced air flow. 46. Said heat dissipation means 44 make it possible to increase the heat exchange surface of the element, here the support block 22, by which the heat is dissipated. These heat dissipation means 44 may be made by cooling fins.

According to a preferred embodiment and illustrated in FIG. 14, giving the assembly a great compactness while promoting the dissipation of the heat produced in particular by the LEDs, the support block 22 comprises a plate 48 made of a thermally conductive material, in particular metal, having on one of its faces, said lower, the housing 36 (the side walls 38 projecting from said plate 48) and on the other side, said upper, fins 50 disposed in planes perpendicular to said plate. The dimensions of the fins and their spacings are determined in order to optimize heat exchange.

The means for generating a forced air flow 46 make it possible to create an air flow that substantially improves the dissipation of heat. Said means 46, such as a fan, may be on the lower and / or upper side of the support block 22.

According to a preferred embodiment of the LED lighting device, heat dissipation means 44, preferably in the form of fins, are also provided at the lower face of the plate 48 of the support block, arranged on the and other housing 36.

According to a variant illustrated in FIG. 5, at least two vents 52 are provided for communicating the inside and the outside of the shell 14 in order to generate, in combination with the ventilation means 46, an air flow from the outside. from the hull inwards to get fresh air in and from the inside to the outside of the hull to evacuate hot air.

According to a preferred embodiment and illustrated in Figure 14, vents 52 are provided to communicate the housing 36 osec externally. These vents 52 combined with the means 46 of ventilation can generate an air flow promoting the delivery of fresh air inside the housing 36 and the evacuation of hot air. Advantageously, in the longitudinal direction of the device corresponding to the vertical plane containing the mast 12, the support block 22 comprises upstream and downstream of the housing 36 gills having fins arranged in the longitudinal direction, attached to the lower face of the plate 48 and connecting said plate 48 and the upstream and downstream side walls 38 of the housing 36, at least one vent 52 being provided at each downstream or upstream side wall 38 of the housing 36. These different arrangements favoring the dissipation of heat contribute to increasing the service life of the components of the device, in particular the LEDs, and thus to reducing the maintenance costs.

According to a first advantage, the fact of closing the housing using the means 24 for processing the light beams makes it possible to reduce the number of parts and facilitates the maintenance of the device.

In addition, according to a second advantage, the closure of the housing 36 by the means 24 for processing the light beams makes it possible to avoid the use of any other transparent protective screen or cover that may disturb the distribution or deform the light beam obtained. thanks to said processing means 24.

The lighting device 16 according to the invention comprises fixing means allowing the means 24 for processing the light rays emitted by the LEDs to be held on the support block 22 and to close the housing 36. sealing 54, in particular a seal located at the periphery of the housing 36, are provided between the means 24 and the support block 22 to effectively complete the closure of the housing 36 made by said means 24 for processing the light beams. The means 24 for processing the light rays emitted comprise means 56 for concentrating, because of the very open illumination angle of an LED and means 58 for directing the light rays so that the illumination on the ground corresponds to an illuminated area that meets the standards. According to one embodiment, the means 24 are in the form of an optical element in one piece as illustrated in FIGS. 5 to 8 or of several superposed optical elements as illustrated in FIGS. 10 and 11. embodiment illustrated in Figure 6, the optical element 24 comprises an array of concentrators (Cl ₁ Cz Ci Cn) each disposed in line with an LED.

Each concentrator (Ci) of the optical element 22 corresponds to a solid element of frustoconical or pαrαboloid shape, centered on an LED and shaped to redirect and focus the light emitted by said LED. As illustrated in FIG. 8, according to one embodiment, a concentrator (Ci) comprises a recess 60 in which an LED (Li) is housed. The network of concentrators (C1, C2 Ci Cn) is made in a single block, in full matter of the optical element.

In order to position as best as possible each concentrator (Ci) of the network of concentrators (C1, C2 Ci Cn) in front of each LED (Li) of the matrix of

LED (L1, L2 Li Ln), means for positioning the optical element may be provided at the support block 22 or the LED support plate 20. These positioning means may be made by at least one protruding element, such as a polarizer or locating, a boss, or any raised part of the support block 22 or a support plate 20 of LEDs capable of providing accurate positioning when the implementation of the optical element 24. According to another embodiment illustrated in Figures 10 and 11, the means 56 of concentration are in the form of a plate 62 comprising on one of its faces (opposite to that facing the LEDs) protruding shapes in the form of corrugations 64 whose peaks are arranged above the LED columns. These corrugations 64 comprise for each LED a hollow concentrator 66 in the form of paraboloid opening via an opening 68 on the face of the plate 62 facing the LEDs. Each concentrator 66 comprises a reflective surface for optimally reflecting the light rays emitted by the LED placed in said concentrator via the opening 68. According to the variants, the plate 62 may be made of a reflective material or only the surface of each concentrator can be coated with a reflective material. According to an embodiment illustrated in FIG. 7, the orientation means 58 of the optical element 24 can be realized by a network of facets (F1, F2 Fi Fn) corresponding to the LED array (L1, L2 Li Ln) of the lighting device. Each facet (Fi) of orientation of the optical element 22 is substantially centered on an LED (Li) and is of suitable geometric shapes and inclination determined to orient the light beam concentrated by the concentrator (Ci) of the LED (Li) corresponding.

Thus, the facets 70 of orientation of the optical element 24 are offset, such as convex piano lenses, also called Fresnel lenses. The array of facets 70 of orientation (Fl, F2 Fi Fn) is made in a single block, in full matter of the optical element 24. More particularly and as illustrated in FIG. 8, each of the faces

(Wire, Fi2 Fij Fin) of a facet (Fi) of orientation is characterized by an inclination angle ctij relative to the plane of the support plate 20 of LED, the plane (XY) in the figure, and by to minus one radius of curvature Rij.

The light rays 72 coming from a concentrator (Ci) of an LED (Li) are first refracted and / or reflected by the concentrator (Ci) corresponding to said LED (Li) so as to be assembled into a beam of maximum light intensity, then refracted by the facet (Fi) orientation corresponding to said LED (Li) so as to be directed and distributed optimally on the area to be illuminated. The optical element 24 is preferably made of polymer by injection / extrusion molding, but it can be made of any other material. For example, the optical element 24 can be made from a polycarbonate awec a surface treatment, including a coating, allowing it to resist UV. According to a preferred variant and illustrated in FIGS. 10 and 11, the means 24 for processing the emitted light flux comprise, in addition to the concentrating means 56, orientation means 58 comprising reflection means 74 for orienting the light beams so as to to get a zone desired or compliant eclαirement means and means 76 of refraction to optimize the transmission of light rays outside by limiting the parasitic reflections of light rays inwardly of the device, said means being stacked on top of each other from the support plate 20 to the outside.

According to an embodiment illustrated in FIG. 10, the concentration means 56 comprise a plate 62 whose periphery comprises lateral walls forming a housing 78 in which the reflection means 74 and the refraction means 76 fit in succession. The dimensions of the side walls forming the housing 78 are adjusted to those of the housing 36.

As shown in FIG. 11, the reflection means 74 comprise V-shaped mirrors 80 (in a section perpendicular to the LED columns) whose tip of the V is oriented towards the LEDs and describes a ridge perpendicular to the columns. of LEDs, a substantially V-shaped mirror 80 vertically above each column of LEDs.

Thus, the light rays emitted by each LED are distributed substantially equitably on both sides of the mirror 80 V located vertically above each LED and propagate to each mirror 80 V. A mirror 80 is not dedicated in particular to an LED or to an LED column, said V-shaped mirrors 80 of the reflection means 74 thus perform a global treatment of the light beams emitted by the LEDs. This global treatment of the light beams emitted by the LEDs generates a fuzzy luminous spot of luminance that is more homogeneous than that of a luminous task obtained by a discrete treatment of the light beams according to the prior art. As illustrated in Figure 15, there are essentially three types of rays: the radii R1, mainly in the axis, which are not reflected by the concentrator but reflected by a mirror 80,

the R2 rays which are neither reflected by the concentrator nor by a mirror,

- R3 rays that are reflected by the concentrator, some R3a are not reflected by a mirror and other R3b are reflected by a mirror.

Advantageously, the dimensions of the concentrator and the mirrors and their relative positions are determined in such a way that the light rays emitted by an LED which are not reflected by the concentrator corresponding to said LED are also not reflected by an adjacent mirror, no disposed above said LED. This configuration makes it possible to avoid parasitic reflections and to adjust the distribution of radii R1 and radii R2. It is noted that the most energetic rays R1 are deflected to reach the areas to be illuminated furthest away. Likewise, the dimensions of the concentrator and the mirrors and their relative positions make it possible to adjust the distribution between the radii R3a and R3b.

According to a first embodiment, the refraction means 76 comprise a wall 82 whose material makes it possible to transmit the light rays and having at its inner face facing the LEDs corrugations 84 whose hollows or ridges are oriented according to FIG. direction of the LED columns and whose radius of curvature is adjusted so that the rays reflected by the mirrors 80 or by the concentrators have a zero or very low angle of incidence so that said rays are not reflected by said surface. Preferably, the outer surface of the wall 82 also comprises corrugations promoting the refraction of the light rays and limiting the reflection of light rays inwardly of the device.

According to one embodiment, the corrugations provided at the outer surface are not identical to those of the inner surface, so that the wall 82 does not have a constant thickness but areas with extra thicknesses improving the rigidity of said wall. Advantageously, the wall 82 comprises stiffeners oriented perpendicular to the corrugations in order to stiffen said wall. According to a second embodiment, the refraction means 76 comprise a wall 82 whose material makes it possible to transmit the light rays and comprising, at its inner and outer faces, facing the LEDs, offset surfaces, in the manner of a Fresnel lens. Said offset surfaces have a radius of curvature substantially corresponding to the radius of curvature of the LED columns 32, the radius of curvature of said offset surfaces decreasing as a function of the spacing relative to the central axis 34, so that the rays reflected by the mirrors 80 or concentrators have a zero or very low angle of incidence, promote the refraction of light rays and limit the reflection of light rays inwardly of the device.

In the first and in the second embodiment of the refraction means 76, an illumination zone as shown in FIG. 12 is obtained on the ground, with a substantially homogeneous luminance over the entire surface and an area in accordance with the regulations. Advantageously, in this preferred embodiment of the means 24 for processing the light rays, the refraction means 76 are held on the support block 22 by the fixing means and seal the housing 36. The sealing means 54, in particular a seal located at the periphery of the housing 36, are provided between the means 76 and the support block 22 to effectively complete the closure of the housing 36 made by said refraction means 76.

As previously, the fact of closing the housing using the means 76 of refraction makes it possible to reduce the number of parts, facilitates the maintenance of the device, and avoids the use of any other screen or transparent protective cover may disturb the distribution or deform the light beam obtained through the means 24 treatment. The V-shaped mirrors 80 as well as the refraction means 76, in their first or second embodiment, allow the realization of a substantially global and fuzzy treatment of the LED light beams to obtain a substantially homogeneous luminance on the entire surface of the area illuminated on the ground. Other functional modules can be added to the lighting device 16 according to the invention.

A brightness measurement module, an activity measurement module and a communication module, just like those described in French Patent Application No. 0650986, can make it possible to improve the management and the supply of LEDs 18 for lighting. . For example, in the case of lighting a street or a public place, the activity measurement module and the brightness measuring means will make it possible to vary the light intensity provided by the device 16. lighting according to the need for lighting and ambient light. During the installation of said lighting device 16 on a lighting network comprising several lighting lanterns 10 or light point, the communication module can, thanks to a suitable communication protocol and more abundantly described in the French application. No. 0650986, to collect and transmit from one light point to the other to a collector information relating to activity measurements and brightness measurements but also relating to a possible defect of a lighting device .

The maintenance of a lighting network, made using the lighting device 16 according to the invention and equipped with a communication module and a brightness measuring module, is thus facilitated because it suffices to consult the data collected by the collector for possible defective lighting devices 16.

According to a preferred arrangement of the LED lighting device 16 according to the invention, the management and power module, the brightness measurement module, the activity measurement module and the communication module are arranged on the face. of the support plate 20 at which are reported the LEDs. According to another characteristic, the lighting device may comprise at least one microcontroller providing several functions, such as, for example, the function allowing the power supply to be adapted automatically according to the LED (s) used, or the function to manage the intensity of the lighting.

Thus, the first function makes it possible to make the device compatible with the majority of the LEDs that can be developed later and used in the lighting device. According to the invention, by measuring the luminous intensity emitted by the set of LEDs, in particular by using a measurement module as described in French Patent Application No. 0650986, it is possible to adjust the power supply by means of the micro-controller in order to to adapt it to the LEDs used and installed in the lighting device. The microcontroller may comprise means for counting time from a time origin specific to the microcontroller and storage means enabling it to store the moment or times according to its time origin at which the ignition instruction or instructions or stop have been transmitted. Thus, the microcontroller can manage the variations in luminous intensity in a temporal manner by referring to its means of counting time and instants according to its time origin at which the start or stop instructions have been transmitted to it.

Claims

1. LED lighting device, more particularly adapted for outdoor lighting, comprising a plurality of LEDs (18) attached to at least one support plate (20) and arranged along lines (28) and columns (32), a support block (22) comprising a plate (48) one of whose faces forms the substantially plane bottom of a housing (36) in which is placed said at least one support plate (20) substantially flat so as to cooperate closely with the bottom of the housing (36), means (44) of heat dissipation provided at the other side of the plate (48) of the support block (22), and means (24) for processing the light rays emitted by the LEDs comprising concentrating means (56), reflection means (74) for orienting the light rays to obtain a desired illumination area, and refraction means (76) for optimizing ray transmission. bright outside by limiting spurious reflections light rays inwardly of the device, the means (56) constituting for each LED of a concentrator (66), said housing (36) containing said support plate (20) being closed by the means (76) the reflection means (74) being separate from the refraction means (76), the LED lighting device is characterized in that the reflection means (74) comprise V-shaped mirrors (80) whose the tip of the V is oriented towards the LEDs, a substantially continuous V-shaped mirror (80) perpendicular to each column of LEDs, in order to produce a substantially global and fuzzy treatment of the LED light beams making it possible to obtain a luminance substantially homogeneous over the entire surface of the area illuminated on the ground.

2. LED lighting device according to claim 1, characterized in that the plate (62) forming the concentration means (56) comprises on one its faces opposite to the LEDs of the corrugations whose ridges are arranged above the LED columns.

3. LED lighting device according to claim 1 or 2, characterized in that certain columns (32) of LEDs have a radius of curvature.

4. LED lighting device according to claim 3, characterized in that the LEDs are arranged along lines (28) substantially rectilinear, parallel to a first axis (30) corresponding to the direction of the largest dimension of the zone illuminated on the ground, and according to columns (32) substantially symmetrical about a median axis (34) substantially perpendicular to the first axis (30), certain columns (32) having a radius of curvature tending to move the LEDs away from the median axis ( 34) as they move away from the first axis (30).

5. LED lighting device according to claim 3 or 4, characterized in that the means (76) of refraction comprise a wall (82) whose material allows to transmit the light rays and having at its inner faces and external, facing the LEDs, surfaces offset, in the manner of a Fresnel lens, having a radius of curvature substantially corresponding to the radius of curvature of the LED columns (32).

6. LED lighting device according to claim 3 or 4, characterized in that the means (76) of refraction comprise a wall (82) whose material allows to transmit light rays and having at its inner face in view of the LEDs of the corrugations (84) whose radius of curvature is adjusted so that the rays received have a zero or very low angle of incidence so that said rays are not reflected by said surface.

7. LED lighting device according to claim 6, characterized in that the wall (82) comprises undulations also at its face facing outwards.

8. LED lighting device according to one of claims 1 to 7, characterized in that it comprises means (46) for generating a forced air flow.

9. LED lighting device according to one of claims 1 to 8, characterized in that the heat dissipation means (44) comprise fins attached to the upper surface of the plate (48) of the support block ( 22).

10. LED lighting device according to one of claims 1 to 4, characterized in that the support block (22) comprises upstream and downstream of the housing (36) gills having fins arranged in the longitudinal direction, reported on the underside of the plate (48) and connecting said plate (48) and the side walls (38) upstream and downstream of the housing (36).

11. LED lighting device according to any one of claims 1 to 10, characterized in that it comprises means (42) for conduction of heat interposed between the support plate (20) and the support block (22). ).