ES2378427T3 - LED lighting device - Google Patents

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 on a spotlight fixed at the upper end of a post or on a support located at a sufficient height.

10 This type of lighting must meet standards regarding the quality of lighting in particular in terms of luminous flux, luminance, surface of the illuminated area, uniformity of the luminance over said area and glare of the source.

15 By way of example, a lighting device intended for the lighting of a public road should illuminate a substantially rectangular surface on the ground of approximately 24 meters by 6 meters, with lighting greater than 10 lux for example and a relatively homogeneous luminance over said area.

Current lamp-type lighting devices consume a lot of energy for average lighting quality and significant maintenance costs.

LED lighting devices are considered today as an advantageous alternative in terms of reducing electrical energy consumption and increasing the life of said device. On the other hand, it is considered that an LED lighting device allows to obtain a lighting accuracy with a quantity

25 controlled light.

However, the use of LEDs for lighting can be problematic for the following reasons:

An LED has a great angle of illumination, which generates a great diffusion and many losses in a

30 application intended to illuminate an area away from said LED. In addition, the LED is generally associated with concentration means intended to gather 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 small light output so that it is necessary

35 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 regrouped in the form of strips or luminous dots that generally comprise three LEDs.

With these limitations in mind, LED lighting devices are generally used for 40 directed illuminations that aim to illuminate a small area as a projector that illuminates a stage.

There are LED lighting devices intended for public lighting that include LEDs or LED strips placed on brackets that allow the light beams of the LEDs to be oriented towards an area to be illuminated.

For example, a first prior art lighting device is described, described in international application WO-98/33007, which comprises several LEDs and means for treating the light rays emitted by said LEDs. In order to best distribute the light beams of the LEDs over the area to be illuminated, this document proposes an arrangement of the LEDs according to different directions on a support

50 inclined and provides for treatment means comprising concentration means and refractive means dedicated to each LED.

A second prior art lighting device, described in international application WO-02/076788, comprises several LEDs, a curved support comprising a location for each of the LEDs, and about 55 means for treating the emitted light rays for the LEDs comprising a reflection and refraction device dedicated to each LED.

The arrangement of the LEDs according to different directions proposed in these two prior art devices leads to a poorly optimized assembly.

60 In fact, in these two prior art documents, the orientation of the light beams of the LEDs in the direction to be illuminated is obtained thanks to an arrangement of said LEDs on a support having inclined surfaces or curves, not facilitating These relatively complex conceptions of a support its realization and its cooling.

In addition, and despite the conceptions of the LED supports, the discrete treatment of the light beams emitted by each of the LEDs proposed in these two prior art documents generates a non-homogeneous luminance on the area to be illuminated, the point being luminous thus created susceptible to be composed of several areas of strong luminosity.

A third prior art device, described in US-2004/0174706, comprises a flat support of several LEDs arranged in a matrix manner and means for treating the light beams emitted by the LEDs, said treatment means comprising means of reflection in the form of inclined slats that separate the LED columns and refractive means superimposed on said reflection means.

The treatment of the light beams of the LEDs proposed in this document US-2004/0174706 does not allow to obtain a homogeneous luminance illumination since it is an orientation treatment of the light beams per LED column capable of leading to a luminous point composed of bands of varying brightness.

From EP 1 760 393, a strip is known which comprises a stage that supports LEDs with concentrators, said stage being arranged in a housing sealed by means of refraction. This type of lighting does not allow obtaining an illuminated area adapted to public lighting.

Considering all these inconveniences, the use of LEDs for public lighting remains marginal.

In addition, the present invention aims to alleviate the drawbacks of the prior art by proposing a LED lighting device more particularly intended for exterior lighting, of simple design and which allows to obtain a homogeneous luminance lighting zone.

For this purpose, the object of the invention is an LED lighting device, more particularly adapted for outdoor lighting, comprising several LEDs placed on at least one support stage and arranged according to rows and columns, a support block comprising a plate one of whose faces forms the substantially flat bottom of a housing in which said at least one substantially flat support plate is located so as to cooperate intimately with the bottom of the housing, heat dissipation means provided at the level of the another face of the support block plate, and means for treating the light rays emitted by the LEDs comprising concentration means, reflection means intended to orient the light rays in order to obtain a desired lighting zone and refractive means intended to optimize the transmission of light rays to the outside by limiting reflections p arguesitas of the luminous rays towards the interior of the device, the concentration means being for each LED constituted by a concentrator, said housing being containing said support stage sealed by the refraction means, the LED lighting device comprising means of reflection, other than the means of refraction, characterized in that the reflection means comprise V-shaped mirrors in which the tip of the V is oriented towards the LEDs, and a substantially continuous V-shaped mirror in the vertical of each LED column

Other features and advantages will become more clearly apparent from the following description, given by way of example only, in relation to the attached drawings, in which:

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Figure 1 is a representation of a light bulb,

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Figure 2 is a representation of an LED lighting device according to the invention adapted to an existing lighting bulb,

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Figure 3 is a representation of an exploded view of an LED lighting device according to a variant of the invention,

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Figure 4 is a representation of a power / life curve of an LED,

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Figure 5 is a schematic representation in side section of the LED lighting device shown in Figure 3,

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

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Figure 7 is a representation of the orientation means of the optical element of the LED lighting device according to a variant of the invention,

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Figure 8 is a sectional representation of the concentration and orientation means illustrated in Figures 6 and 7;

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

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

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Figure 11 is a section that illustrates in detail the treatment of the light rays coming from the LEDs of the device illustrated in Figures 9 and 10,

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Figure 12 is a schematic representation illustrating the illumination on the ground obtained from the device of Figure 9,

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Figure 13 is a schematic representation of the implantation of the LEDs according to a preferred embodiment,

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Figure 14 is a sectional view schematically illustrating the lighting device according to the invention, and

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Figure 15 is a section illustrating the orientation of the light rays emitted by an LED.

In FIG. 1, a light bulb 10 capable of being placed in a lamppost, against the facade of a building or in any other lighting support, is shown by way of illustration. This focus 10 comprises a frame 12 in which a housing 14 of which at least one part, generally the lower part, is open or substantially transparent is fixed so that the light provided by a lighting device or lamp located inside said housing 14.

An LED lighting device 16 according to a variant of the invention will be described below, which can be placed in a lighting spot 10 more particularly intended for exterior lighting, in particular a public place such as a road or a street. This application, represented in Figure 2, is not at all limiting the possibilities of using an LED lighting device according to the invention.

As illustrated in Figure 3, an LED lighting device 16 comprises several LEDs 18 placed on at least one support stage 20 located between a support block 22 and treatment means 24 of the light beams emitted by the LEDs , the LEDs 18 being provided to provide a luminous power at least equivalent to that provided by existing lighting devices.

The LEDs 18 of the lighting device 16 are power LEDs between 1 and 5 W to give an idea. These values are not at all limiting.

Advantageously, the LEDs 18 of the lighting device 16 are used at half of their maximum utilization power. Thus, as illustrated in Figure 4 representing a power / life curve of an LED, the LEDs 18 are likely to offer a longer lifespan, such as a corresponding useful life of approximately 50,000 hours, for example , to the specifications required by a public lighting project.

Preferably, the plurality of LED 18 of the lighting device 16 is mounted in series so that the regulation of its power supply is simplified, said device 16 being powered by a mains voltage in most of the lighting applications of an object or of a place. However, a parallel assembly could be conceived.

The support plate 20 is presented in the form of a printed circuit board on one of whose faces the LEDs are placed. According to a preferred embodiment, illustrated in Figure 14, the LEDs as well as the set of components (represented in the form of at least one module 26 in Figure 14) which guarantee in particular the power and management function of the components. LEDs are placed on one of the faces of a flat support plate 20. According to another variant, the support stage 20 can comprise only the LEDs on one of its faces, the components that in particular guarantee the power and management function of the LEDs being regrouped in the form of at least one module 26 implanted in another area of the device, for example behind the support block.

According to a preferred embodiment, the feeding and management of the LEDs can be carried out according to the assembly and with the components detailed in the French patent application FR 2 901 956. However, other solutions can be devised.

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 may be arranged according to other arrangements. Thus, the LEDs may not be aligned but arranged according to curves.

In Figure 13, an implantation of the LEDs that allows to improve the lighting, in particular when adapted to a public street, has been represented. The LEDs are arranged along substantially straight rows 28, parallel to a first axis 30 corresponding to the direction of greatest dimension of the area illuminated on the ground, and according to columns substantially symmetrical 32 along a middle axis 34 (substantially perpendicular to the first axis 30 ), with certain columns 32 having a radius of curvature that tends to separate the LEDs from the middle axis 34 as they move away from the first axis 30. Advantageously, the radius of curvature of the columns 32 decreases as a function of the separation between the column and the middle axis 34.

As an example, the LEDs are arranged according to seven rows and eight columns.

According to a preferred embodiment of the invention, the LEDs are separated from each other by a distance of the order of 20 millimeters between rows and between columns. This distance of 20 mm between LEDs advantageously decreases the volume occupied thus favoring the adaptation of the lighting device 16 to an existing focus 10. However, it is a minimum distance in order to guarantee a compromise between the benefit in terms of the volume occupied and a too important proximity of the LEDs 18 that would disadvantageously favor its temperature increase.

In order to be placed in a housing 14 of an existing lighting bulb 10 and as illustrated in Figure 5, the device 16 according to the invention comprises a support block 22 which has fixing means to said housing 14 or directly to a frame 12 in which the lighting bulb 10 is fixed. These fixing means of the support block 22 are not detailed in this case because they can be presented in numerous forms and are known to those skilled in the art.

According to another variant, the lighting device forms a focus as illustrated in Figures 9, 10 and 14. In this case, the lighting device of the invention replaces the existing bulbs.

According to the invention, whatever the variant, the support block 22 comprises a housing 36 provided to accommodate at least one LED support stage 20, said housing being closed by the means of treatment 24 of 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 LED support stage 20 and means of treatment 24 of 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 intimately cooperate with said at least one support plate 20 also flat in order to ensure an efficient thermal transfer between the support plate 20 and the support block 22.

The LED support plate 24 is fixed on the bottom 40 by means of fixing means such as fixing screws. Advantageously, conduction means 42 can be provided to effectively transfer the heat dissipated by the LEDs to the support block 22. These heat conduction means 42, sandwiched between a support plate 20 and the support block 22, can be provided make using a thermally conductive but electrically insulating film. Since the fixing means of the support plate 20 substantially compress the heat conduction means 42, an optimal transfer of the heat generated by the LEDs to the support block 22 is guaranteed.

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 heat dissipation means 44 of static type 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, in this case the support block 22, by means of which the heat is dissipated. These heat dissipation means 44 may be made by cooling fins.

According to a preferred embodiment and illustrated in Figure 14, which gives the assembly great compactness while favoring the dissipation of heat produced in particular by the LEDs, the support block 22 comprises a plate 48 of a thermally conductive material , in particular metallic, comprising on one of its faces, called lower, the housing 36 (projecting the side walls 38 with respect to said plate 48) and on the other face, called upper, fins 50 arranged in planes perpendicular to said license plate. The dimensions of the fins and their separations are determined in order to optimize thermal exchanges.

The means for generating a forced air flow 46 allow to create an air flow that substantially improves heat dissipation. Said means 46, such as a motor fan, can be found on the lower and / or upper face 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 level of the lower face of the plate 48 of the support block, arranged on both sides of the accommodation 36.

According to a variant illustrated in FIG. 5, at least two ventilation holes 52 are provided for communicating the interior and exterior of the housing 14 in order to generate, in combination with the ventilation means 46, an air flow from the outside of the housing inwards in order to cause fresh air to penetrate and from the inside to the outside of the housing in order to evacuate the hot air.

According to a preferred embodiment and illustrated in Figure 14, ventilation holes 52 are provided for communicating the housing 36 with the outside. These ventilation holes 52 combined with the ventilation means 46 allow to generate an air flow that favors the channeling of the fresh air into the housing 36 and the evacuation of the hot air. Advantageously, according to the longitudinal direction of the device corresponding to the vertical plane containing the post 12, the support block 22 comprises upstream and downstream of the housing 36 some openings comprising fins arranged according to the longitudinal direction, placed on the lower face of the plate 48 and joining said plate 48 and the side walls 38 upstream and downstream of the housing 36, at least one vent hole 52 disposed at the level of each side wall downstream or upstream 38 of the housing 36.

These different arrangements that favor heat dissipation contribute to increase the life of the device components, in particular LEDs, and thus reduce maintenance costs.

According to a first advantage, the fact of closing the housing with the help of the treatment means 24 of the light beams allows to reduce the number of parts and facilitates the maintenance of the device.

In addition, according to a second advantage, the closing of the housing 36 by means of the treatment means 24 of the light beams makes it possible to avoid the use of any other transparent shield or cover capable of disturbing the distribution or deforming the light beam obtained thanks to said means of treatment 24.

The lighting device 16 according to the invention comprises fixing means that allow the means of treatment 24 of the light rays emitted by the LEDs to be maintained on the support block 22 and secure the housing 36. Advantageously, some means of providing sealing 54, in particular a joint located on the periphery of the housing 36, between the means 24 and the support block 22 in order to effectively complete the closure of the housing 36 made by said means of treatment 24 of the light beams.

The treatment means 24 of the emitted light rays comprise concentration means 56, due to the very open lighting angle of an LED, and orientation means 58 of the light rays so that the illumination on the floor corresponds to an illuminated area according to the standards.

According to one embodiment, the means 24 are presented in the form of a single-piece optical element as illustrated in Figures 5 to 8 or of several superimposed optical elements as illustrated in Figures 10 and 11. According to a embodiment illustrated in figure 6, the optical element 24 comprises a network of concentrators (C1, C2, ..., Ci, ..., Cn) each arranged at the level of an LED. Each concentrator (Ci) of the optical element 22 corresponds to a solid element of a conical or paraboloid shape, centered on an LED and adapted to redirect and concentrate the light emitted by said LED.

As illustrated in Figure 8, according to one embodiment, a concentrator (Ci) comprises a cavity 60 in which an LED (Li) is to be housed. The network of concentrators (C1, C2, ..., Ci, ..., Cn) is made in a single block, in the solid material of the optical element.

In order to best position each concentrator (Ci) of the network of concentrators (C1, C2, ..., Ci, ..., Cn) in front of each LED (Li) of the LED array (L1, L2, ..., Li, ..., Ln), means for positioning the optical element at the level of the support block 22 or of the LED support plate 20 may be provided. These positioning means can be realized by at least one protruding element, such as a positioning or location groove, a projection, or any raised part of the support block 22 or of a LED support plate 20 capable of providing positioning precise during the placement of the optical element 24.

According to another embodiment illustrated in Figures 10 and 11, the concentration means 56 are presented in the form of a plate 62 comprising on one of its faces (opposite to the one facing the LEDs) protruding forms in the form of undulations 64 whose ridges are arranged above the LED columns. These corrugations 64 comprise for each LED a hollow paraboloid-shaped concentrator 66 that flows through an opening 68 in the face of the plate 62 in front of the LEDs. Each concentrator 66 comprises a reflective surface intended to optimally reflect the light rays emitted by the LED located in said concentrator through the opening 68. According to the variants, the plate 62 can be made of a reflective material or can only be coated the surface of each concentrator of a reflective material.

According to an embodiment illustrated in Figure 7, the orientation means 58 of the optical element 24 is

5 can be done using a network of facets (F1, F2, ..., Fi, ..., Fn) that correspond to the LED matrix (L1, L2, ..., Li, ..., Ln) of the lighting device Each orientation facet (Fi) of the optical element 22 is substantially centered on an LED (Li) and is of adapted geometric shapes and of a certain inclination to orient the beam of light concentrated by the concentrator (Ci) of the corresponding LED (Li).

10 Thus, the orientation facets 70 of the optical element 24 are displaced, such as flat convex lenses, also referred to as Fresnel lenses. The orientation facet network 70 (F1, F2, ..., Fi, ..., Fn) is made in a single block, of solid material of the optical element 24.

More particularly and as illustrated in Figure 8, each of the faces (Fi1, Fi2, ..., Fij, ..., Fin) of an orientation facet 15 (Fi) is characterized by an inclination angle αij with respect to the plane of the LED support stage 20, the plane (XY) in the figure, and for at least one radius of curvature Rij.

The light rays 72 coming from a concentrator (Ci) of an LED (Li) are firstly refracted and / or reflected by the concentrator (Ci) corresponding to said LED (Li) so that they meet in a beam of intensity 20 maximum luminous, and then they are refracted by the orientation facet (Fi) corresponding to said LED (Li) so that they are optimally directed and distributed over the area to be illuminated.

The optical element 24 is preferably made of polymer by injection / extrusion molding, but can be made of any other material.

25 By way of example, the optical element 24 can be made from a polycarbonate with a surface treatment, in particular a coating, which allows it to resist UV.

According to a preferred variant and illustrated in Figures 10 and 11, the light flow treatment means 24

30 issued in a complementary manner comprise concentration means 56, orientation means 58 comprising reflection means 74 intended to orient the light rays in order to obtain a desired lighting zone or in accordance with the standards and means of refraction 76 intended to optimize the transmission of light rays to the outside by limiting the parasitic reflections of the light rays towards the inside of the device, said means stacking one on top of the other from the support plate 20 towards the outside.

35 According to an embodiment illustrated in FIG. 10, the concentration means 56 comprise a plate 62 whose periphery comprises side walls forming a housing 78 in which the reflection means 74 and the refractive means 76 are successively embedded The dimensions of the side walls that form the housing 78 conform to those of the housing 36.

40 As illustrated in Figure 11, the reflection means 74 comprise V-shaped mirrors 80 (according to a section perpendicular to the LED columns) in which the tip of the V is oriented towards the LEDs and describes a crest in the vertical of the LED columns, and a substantially continuous V-shaped mirror 80 in the vertical of each LED column.

Thus, the light rays emitted by each LED are distributed substantially equitably to both sides of the mirror 80 in V located on the vertical of each LED and propagate towards each mirror 80 in V.

Since a mirror 80 in particular is not dedicated to an LED or a column of LEDs, said V-shaped mirrors 80 of the reflection means 74 therefore perform a global treatment of the light beams emitted by the LEDs.

This overall treatment of the light beams emitted by the LEDs generates a defocused luminous point of luminance more homogeneous than that of a luminous point obtained by a discrete treatment of the light beams according to the prior art.

55 As illustrated in Figure 15, there are essentially three types of rays:

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R1 rays mainly on the axis that are not reflected by the concentrator but are reflected by a

mirror 80, 60

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R2 rays that are not reflected by the concentrator, nor by a mirror,

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the rays R3 that are reflected by the concentrator, of which some R3a are not reflected by a mirror and

other R3b are reflected by a mirror. 65

Advantageously, the dimensions of the concentrator and the mirrors and their relative positions are determined such that the light rays emitted by an LED that are not reflected by the concentrator corresponding to said LED are also not reflected by an adjacent mirror, not arranged above said LED. This configuration allows avoiding parasitic reflections and adjusting the distribution of R1 and R2 rays. It is observed that the most energetic R1 rays are diverted to reach the areas to be illuminated farther away.

Also, the dimensions of the concentrator and the mirrors and their relative positions allow adjusting the distribution between the rays R3a and R3b.

According to a first embodiment, the refractive means 76 comprise a wall 82 whose material allows light rays to be transmitted and which comprises undulations 84 at the level of its inner face in front of the LEDs, whose holes or ridges are oriented according to the 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 small incidence angle so that said rays are not reflected by said surface.

Preferably, the outer surface of the wall 82 also comprises undulations that favor the refraction of the light rays and that limit the reflection of the light rays towards the interior of the device.

According to one embodiment, the corrugations provided at the level of the outer surface are not identical to those of the inner surface so that the wall 82 does not have a constant thickness but rather areas with thicknesses that improve the stiffness of said wall. Advantageously, the wall 82 comprises stiffeners oriented perpendicularly to the corrugations in order to stiffen said wall.

According to a second embodiment, the refractive means 76 comprise a wall 82 whose material allows transmitting the light rays and comprising, at the level of its inner and outer faces, facing the LEDs, displaced surfaces, as a lens of Fresnel Said displaced surfaces have a radius of curvature that substantially corresponds to the radius of curvature of the LED columns 32, decreasing the radius of curvature of said displaced surfaces as a function of the separation with respect to the middle axis 34, so that the rays reflected by mirrors 80 or concentrators have a zero incidence angle

or very small, favor the refraction of light rays and limit the reflection of light rays into the device.

In both the first and second embodiments of the refractive means 76, a lighting zone such as that shown in Figure 12 is obtained on the ground, with a substantially homogeneous luminance over the entire surface and an area of agreement With the regulation.

Advantageously, in this preferred variant of the realization of the means of treatment 24 of the light rays, the refraction means 76 are held on the support block 22 by means of the fixing means and seal the housing 36. The sealing means 54, in Particularly a gasket located on the periphery of the housing 36, are provided between the means 76 and the support block 22 in order to effectively complete the closure of the housing 36 made by said refractive means 76.

As before, closing the housing with the help of refractive means 76 reduces the number of pieces, facilitates the maintenance of the device, and avoids the use of any other transparent protection screen or cover capable of disturbing the distribution or deformation of the light beam obtained thanks to the treatment means 24.

The V-shaped mirrors 80 as well as the refractive means 76, in their first or second embodiment, allow a substantially global and unfocused treatment of the LED light beams to be obtained, which makes it possible 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 luminosity measurement module, an activity measurement module and a communication module, as described in the French patent application FR 2 899 057, can make it possible to improve the management and feeding of the lighting LEDs 18.

For example, in the case of the lighting of a track or a public place, the activity measuring module and the luminosity measuring means will allow to vary the light intensity provided by the lighting device 16 depending on the need for lighting and ambient brightness.

During the installation of said lighting device 16 in a lighting network comprising several lighting bulbs 10 or luminous points, the communication module can allow, thanks to a communication protocol adapted and described more broadly in the French application FR 2 899 057, collect and transmit from one light point to another to a collector information relating to activity measurements and luminosity measurements but also related to a possible defect of a lighting device.

This facilitates the maintenance of a lighting network, carried out with the help of the lighting device 16

5 according to the invention and equipped with a communication module and with a luminosity measurement module, since it is enough to consult the data collected by the collector to know the possible defective lighting devices 16.

According to a preferred arrangement of the LED lighting device 16 according to the invention, the management module

10 and power supply, the luminosity measurement module, the activity measurement module and the communication module are arranged on the face of the support stage 20 at the level of which the LEDs are placed.

According to another characteristic, the lighting device may comprise at least one microcontroller that guarantees several functions, such as for example the function that allows self-adapting the power according to the

15 or of the LEDs used (s), or the function that allows lighting intensity management.

Thus, the first function allows the device to be compatible with most of the LEDs that can be developed in the future and used in the lighting device.

According to the invention, by measuring the light intensity emitted by the LED assembly, in particular using a measuring module as described in French patent application FR 2 899 057, the power can be adjusted thanks to the microcontroller in order to adapt it to the LEDs used and installed in the lighting device.

The microcontroller may comprise countdown means from a temporary origin of the microcontroller itself and memorization means that allow it to store the instant or instants according to its temporary origin in which the ignition instruction (s) have been transmitted to it. or stop. Thus, the microcontroller can manage the variations of light intensity on a temporary basis by referring to its means of countdown and instants according to its temporary origin in which the instructions of

30 start or stop.

Claims (11)

1. LED lighting device, more particularly adapted for outdoor lighting, comprising several LEDs (18) placed on at least one support stage (20) and arranged according to rows (28) and columns (32), a support block (22) comprising a plate (48) one of whose faces forms the substantially flat bottom of a housing (36) in which said at least one substantially flat support plate (20) is located so as to cooperate with intimately with the bottom of the housing (36), means (44) for heat dissipation provided at the level of the other side of the plate (48) of the support block (22), and means (24) for treating the light rays emitted by the LEDs comprising concentration means (56), reflection means (74) intended to orient the light rays in order to obtain a desired lighting zone and means ( 76) of refraction intended to optimize the transmission of the light rays to the outside by limiting the parasitic reflections of the light rays towards the inside of the device, the concentration means (56) being for each LED constituted by a concentrator (66), said being housing (36) containing said support stage (20) sealed by the means (76) of refraction, the reflection means (74) being different from the means (76) of refraction, the LED lighting device being characterized in that The reflection means (74) comprise V-shaped mirrors (80) in which the tip of the V is oriented towards the LEDs, a substantially continuous V-shaped mirror (80) in which vertical of each column of LEDs, in order to perform a substantially global and unfocused treatment of the LED light beams that allows to obtain a substantially homogeneous luminance over the entire surface of the illuminated area 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 of its faces opposite to the LEDs undulations whose ridges are arranged above the LED columns.

3.

LED lighting device according to claim 1 or 2, characterized in that certain columns

(32) LEDs have a radius of curvature.

Four.

LED lighting device according to claim 3, characterized in that the LEDs are arranged along substantially straight rows (28), parallel to a first axis (30) corresponding to the direction of the largest dimension of the illuminated area on the ground, and according to substantially symmetrical columns (32) along a middle axis (34) substantially perpendicular to the first axis (30), with certain columns (32) having a radius of curvature that tends to separate the LEDs from the middle axis (34) as move away from the first axis (30).

5.

LED lighting device according to claim 3 or 4, characterized in that the refractive means (76) comprise a wall (82) whose material allows transmitting the light rays and comprising at the level of its inner and outer faces, facing the LEDs , displaced surfaces, like a Fresnel lens, which have a radius of curvature that substantially corresponds to the radius of curvature of the LED columns (32).

6.

LED lighting device according to claim 3 or 4, characterized in that the refractive means (76) comprise a wall (82) whose material allows the transmission of light rays and which comprises undulations at the level of its inner face facing the LEDs ( 84) whose radius of curvature is adjusted so that the received rays have a zero or very small incidence angle so that said rays are not reflected by said surface.

7.

LED lighting device according to claim 6, characterized in that the wall (82) also comprises undulations at the level of 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 applied on 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) openings comprising fins arranged according to the longitudinal direction, applied on the face bottom of the plate (48) and connecting said plate (48) and the side walls (38) upstream and downstream of the housing (36).

eleven.

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