EP2886942A1 - Lighting device - Google Patents

Abstract

The present invention relates to a lighting device (1) characterized in that it comprises: a support (2) having a substantially plane rear wall (3) comprised in a reference plane (P) and at least one side wall ( 4) delimiting an interior space (5), the side wall (4) delimiting, on a side opposite to the rear wall (3), a closed contour (6) of an opening (7); an illumination system (8) comprising at least one electrical mechanism (9) supplying a plurality of light sources (10) carried by the side wall (4) of the support (2) facing the interior space (5) and distributed along all or part of the closed contour (6); a diffuser (11) arranged to close the opening (7) of the support (2) and adapted to be traversed by the light rays; at least one reflector (12) located in the interior space (5) delimited by the support (2) and the diffuser (11) for reflecting the light rays from the sources (10) of light towards the diffuser (11); and in that the reflector (12) delimits, with the support (2), a chamber (13) inside which is housed the electric mechanism (9).

Description

TECHNICAL FIELD OF THE INVENTION

The present invention relates to a lighting device.

STATE OF THE PRIOR ART

Lighting devices, such as ambient lighting for public or private premises such as corridors, or security lighting, are well known.

A problem encountered in this type of lighting device is that of its size. Indeed, plus a device is salient with respect to a wall that supports it, such as a wall or a ceiling, and its volume, will have an unsightly effect for a user. For this, one of the manufacturing constraints of such a lighting device is that the device is as flat as possible so as to limit its projection relative to the wall.

Nevertheless, the reduction in the size of a lighting device generally forces these devices to glare problems due to the lighting itself. Indeed, and in particular when light sources are placed at a very short distance from a surface of a diffuser, it appears in this case as many "tasks" lights that light sources on said diffuser which will then be visible by the user. In addition, the light intensity is in this case too important and may dazzle its user.

This problem is even more important when the light sources of the lighting device are light emitting diodes (LEDs). Indeed, in such a configuration the number of light sources can be very important, and therefore the present tasks will be in large numbers and will amplify this unsightly effect due to tasks as the light intensity.

Furthermore, by being confronted with such a problem, it is possible to move the light sources away from the diffuser. However, this will result, on the one hand to increase the size of the lighting device and, on the other hand, to reduce the intensity of the luminous flux once the diffuser crossed to illuminate the user.

To manage this glare problem, it is also possible to use a lens, a reflector or an opalescent diffuser.

A lens indeed makes it possible to concentrate the luminous flux but causes however a strong dazzle. It is always possible to remove the lens of the diffuser but this is only feasible to the detriment of its size.

On the contrary, a reflector makes it possible to reduce the glare effect and to distribute the luminous flux differently at the output of the lighting device. However, a reflector does not channel the flow of light sources, so its effect is much less.

Moreover, by playing on the opalescence of the diffuser, it is possible to reduce the glare effect. Nevertheless, this also decreases the efficiency of the lighting device and leads to the increase of the temperature in the product.

Another disadvantage associated with this type of device is that of the electric mechanism of the lighting device which makes its bulk more important, especially in the case of LED light sources. Indeed, in the case of LEDs, the problem of volume is all the more important as an electrical mechanism supplying these LEDs is larger than the electrical mechanisms for devices lighting with other types of light sources such as fluorescent tubes or incandescent lamps that require much less complex power supply devices, or even directly connected to the power grid, to provide a brightness of substantially equivalent intensity.

SUMMARY OF THE INVENTION

The device described later aims to remedy all or part of the disadvantages of the state of the art and in particular to achieve a simple and reliable lighting device, for example user friendly or security, to reduce its size while providing a luminous flux large enough to provide sufficient lighting for a user and avoiding any phenomenon of glare.

• un support présentant une paroi arrière sensiblement plane comprise dans un plan de référence et au moins une paroi latérale délimitant un espace intérieur, la paroi latérale délimitant, d'un côté opposé à la paroi arrière, un contour fermé d'une ouverture ;
• un système d'éclairage comprenant au moins un mécanisme électrique alimentant une pluralité de sources de lumière portées par la paroi latérale du support, orientées vers l'espace intérieur et réparties le long de tout ou partie du contour fermé ;
• un diffuseur disposé de sorte à fermer l'ouverture du support et adapté pour être traversé par les rayons lumineux ; et
• au moins un réflecteur situé dans l'espace intérieur délimité par le support et le diffuseur pour réfléchir les rayons lumineux issus des sources de lumière vers le diffuseur ;

le réflecteur délimitant, avec le support, une chambre à l'intérieur de laquelle est logé le mécanisme électrique.For this purpose, the subject of the invention is a lighting device comprising:

• a support having a substantially flat rear wall in a reference plane and at least one side wall defining an interior space, the side wall defining, on a side opposite the rear wall, a closed contour of an opening;
• a lighting system comprising at least one electrical mechanism supplying a plurality of light sources carried by the lateral wall of the support, oriented towards the interior space and distributed along all or part of the closed contour;
• a diffuser arranged to close the opening of the support and adapted to be traversed by the light rays; and
• at least one reflector located in the interior space delimited by the support and the diffuser for reflecting the light rays from the light sources towards the diffuser;

the reflector defining, with the support, a chamber inside which is housed the electric mechanism.

The reference plane preferably corresponds to a plane substantially parallel to that of a wall that supports the device, such as a wall or a ceiling.

Moreover, in such a configuration, the light sources being arranged laterally, directed towards the interior space, and the light rays of these sources being reflected towards the diffuser, which is placed at the opening opposite to the rear wall, this makes it possible to move said light sources away from the diffuser itself. Therefore any glare effect and bright "tasks" is removed.

The light rays of the light sources carried by the side walls being reflected, these light sources form indirect lighting and the illumination of the lighting device is uniform.

In addition, the interior space delimited substantially by the support and the diffuser is then divided into two complementary intermediate spaces by the reflector: the first being the one within which the light rays of the light sources can evolve, the second being that corresponding to the chamber housing the electric mechanism.

The electrical mechanism thus housed in the chamber allows a saving in space, which combined with the fact that the light sources are arranged on the side walls and not directly behind the diffuser, is particularly advantageous for designing a lighting device of small thickness. Is understood here by the term "thickness", the distance between the rear wall of the support and the diffuser.

Advantageously, the chamber inside which the electrical mechanism is housed is delimited essentially exclusively by the reflector and the support, more preferably by the reflector and the rear wall of the support.

It is understood by "substantially exclusively", the fact that the chamber is delimited by the reflector and the support, possibly with some parts of negligible dimensions relative to that of said chamber, which can locally form a limit of this chamber. This will be the case, for example, when a thin seal will be placed between the reflector and the support.

According to a particular technical characteristic, the reflector has a section, in a plane of section substantially perpendicular to the reference plane, of generally concave shape oriented towards the rear wall side so that said reflector delimits, with said rear wall of the support, the room inside which is housed the electric mechanism.

Such a configuration, in which the chamber has a space delimited by the generally concave shape reflector and only the rear wall of the support, that is to say without the side wall (s) is particularly advantageous when light sources are disposed on the side wall (s) opposite in this section. In this way the volume of the chamber is particularly optimized to enclose the electrical mechanism of the lighting device.

• une base inférieure maintenue au support, de préférence au niveau de sa paroi arrière, et située dans une position assemblée au voisinage de la paroi latérale ; et
• une extrémité supérieure disposée, dans la position assemblée, située au voisinage du diffuseur.

Advantageously, the reflector, of generally concave shape, has:

• a lower base held to the support, preferably at its rear wall, and located in an assembled position in the vicinity of the side wall; and
• an upper end disposed in the assembled position, located in the vicinity of the diffuser.

Such a configuration makes it possible at the same time to improve the luminous intensity of the lighting device by increasing the reflection surfaces while optimizing the interior volume of the chamber in order to house the electric mechanism.

In a particular configuration, the lower base of the reflector is held fixed by the assembly itself of the various components of the lighting device forming a holding means. In this case, at least part of this bottom base can be sandwiched during assembly so as to hold the reflector against the rear wall. In another embodiment, the lower base is held and fixed to the support, in particular to the rear wall, by fastening means, such as, for example, elastic pastes for fixing by clipping the lower base of the reflector to the rear wall.

According to another advantageous characteristic, the overall concave shape of the reflector has a slope at its base strictly greater than a slope at its upper end.

In this way, the concave shape generally has a dome shape, and more preferably a flattened dome shape.

In a particular configuration, the electrical mechanism comprises at least one power supply circuit of the lighting system and a control circuit for controlling the light sources.

In a particular arrangement, the supply circuit comprises at least one accumulator. This is particularly the case of safety lighting devices, these requiring an auxiliary source of power supply.

• des premières portions inclinées de quelques degrés, positivement par rapport au plan de référence et négativement par rapport à la paroi latérale de laquelle proviennent les rayons lumineux qu'elles réfléchissent; et
• des deuxièmes portions inclinées positivement par rapport au plan de référence et négativement par rapport à la paroi latérale de laquelle proviennent les rayons lumineux qu'elles réfléchissent

les deuxièmes portions inclinées présentant une inclinaison strictement supérieure à l'inclinaison des premières portions inclinées par rapport au plan de référence. Par le vocable « quelques degrés » est entendu moins de 10 degrés, de préférence entre 0.5 et 5 degrés.Advantageously, the reflector has a section, in a plane of section substantially perpendicular to the reference plane, which has, at least locally, and successively:

• first portions inclined a few degrees, positively relative to the reference plane and negatively with respect to the side wall from which the light rays they reflect; and
• second portions inclined positively with respect to the reference plane and negatively with respect to the side wall from which the light rays they reflect

the second inclined portions having an inclination strictly greater than the inclination of the first portions inclined with respect to the reference plane. By the term "a few degrees" is meant less than 10 degrees, preferably between 0.5 and 5 degrees.

Such a succession of slightly inclined portions and greater inclination (s) (s) improves the reflection of light throughout the diffuser while avoiding the risk of shadows and allowing congestion minimum, with a reflector having a height from its base to its relatively small upper end.

Advantageously, the lighting device comprises at least one collimator for directing the light rays of the light sources towards the reflector.

Such a collimator thus allows to channel and concentrate the luminous flux, without causing dazzle. Indeed, in this way the light rays are all directed to the reflector after being collimated and then pass through the diffuser after being reflected. In such a configuration, the optical paths between the light sources carried by the lateral wall (s) (s) and the diffuser are sufficiently important to prevent any appearance of light task, said light source is also not directly in the diffuser, and the collimator makes it possible to improve the luminous intensity.

Furthermore, this does not degrade the overall size of the lighting device thanks to the chamber housed integrally in the interior space delimited by the support of the device.

Advantageously, the lighting device comprises a plurality of collimators, said collimators being collimating lenses arranged opposite each of the light sources, preferably polycarbonate or polymethylmethacrylate.

Advantageously, the light sources are light-emitting diodes, preferably carried by at least one printed circuit which is held against the side wall of the support on the side of the interior space by fixing means.

The use of light-emitting diodes (LEDs) may be permitted under these conditions without generating bright "spots" with maximum intensity.

In particular configurations, the lighting device comprises means for additional orientation of the light rays. These additional orientation means may for example be streaks on the diffuser. In an alternative or complementary configuration, these orientation means may comprise adjustable flaps forming a local wall of the reflector so that the orientation of the flaps concomitantly or independently of one another allows the control of the orientation of the luminous flux.

Preferably, the support is aluminum or Zamak. In other cases, especially in the case of low light levels, the support may also be plastic or plastic loaded.

This allows a better evacuation of the heat. Indeed, for the proper functioning of the light emitting diodes the lighting device is preferably closed, and more precisely sealed, that is to say hermetically closed. However, in such conditions of use, the temperature rises rapidly in the interior space of the support enclosing the light sources.

In our case, the lateral wall (s) of the support carrying the light sources each have an outer surface, oriented on the outer side and an inner surface on which are fixed all or part of the light sources, which are directed towards the interior space and distributed along all or part of the closed contour.

In this configuration, on the one hand the heat is removed by the outer surfaces directly in contact with the outside, and on the other hand this heat evacuation is favored by the material of the support itself.

The support may also have, on the side of the outer surfaces of its or its side wall (s), cooling ribs so as to increase the surface dimension of the outer surface in contact with the ambient air so as to improve heat exchange.

Advantageously, the light-emitting diodes are fixed on a circuit, which is in close contact with the support, at the level of the inner surface (s) of its side wall (s). Such contact also allows heat exchange directly diodes with the outer surfaces of the support.

Advantageously, the reflector is made of white polycarbonate, mirror-polished or polished-ice or mirror-polished aluminum, this improving the reflecting power of the reflector.

In a particular technical configuration, the diffuser is opalescent plastic or transparent.

According to an advantageous characteristic, the lighting system comprises, in addition to the light sources carried by the lateral wall (s) of the support forming the indirect lighting, light sources carried by the rear wall and oriented towards the interior space, preferably directly towards the diffuser, these light sources being fed by the electric mechanism.

In such a configuration, the light sources carried by the rear wall form a direct light. Indeed, even if a small portion of the rays from these light sources can be reflected in the interior space of the lighting device before passing through the diffuser, a large majority of their light rays pass through the diffuser without reflection.

Such direct light sources of light make it possible to increase the power of the lighting device without adding light sources carried by the side wall, a solution which would then necessitate modifying the dimensions of the support, for example by increasing its diameter in the case of a circular closed contour. This would be contrary to the problem of a small footprint.

Moreover, and in the case where the light sources are light-emitting diodes, the addition of direct light sources, carried by the rear wall, allows the use of less powerful light-emitting diodes for a satisfactory lighting thus reducing the risk glare.

In addition, these direct light sources combined with indirect light sources provide maximum illumination at least compatible with a normative level of illumination of devices with fluorescent or incandescent lighting, without adding additional lighting points. in the room to be illuminated.

Such a lighting device can be used, of course, in the case of new installations, but especially in the case of existing installations, especially in the case of renovation, or the replacement must guarantee the same normative level of illumination as the devices To replace.

Furthermore, in such a configuration, the size of the lighting device is similar to that of the lighting device provided only with indirect lighting.

Preferably, the light sources carried by the rear wall of the support are located facing reflector orifices, these orifices being located on substantially flat portions and parallel to the reference plane, and more preferably between said rear wall and the planar portions of the reflector closest to said rear wall, for example at the base of the reflector. This guarantees a sufficient distance from these light sources forming direct lighting of the diffuser avoiding any risk of glare.

Advantageously, the diffuser may have a curve oriented so as to substantially project relative to the lighting device. In other words, the concave part of the curve is oriented towards the interior space. This curve makes it possible to precisely control the distance between the diffuser and the light sources of the direct lighting without requiring to modify the dimensions of the support, in particular the side walls.

Even if the diffuser has a locally protruding shape relative to the support, this projection is, in addition to being located, relatively low compared to the dimensions of the support, the latter not being modified. Therefore, even if the distance between the rear wall of the support and the diffuser defining the thickness is locally increased, it does not affect the size of the device, the side wall (s) having a height unchanged. Moreover, to a certain extent this curve brings an improved aesthetic to the device and is not likely to degrade it.

More preferably, the light-emitting diodes are fixed on one or more circuit (s), which is in close contact with the support, at the level of the inner surface (s) of its rear wall, this intimate contact allowing heat exchange directly diodes from the indirect lighting with the outer surfaces of the support.

In an advantageous configuration, the light sources carried by the rear wall forming direct lighting are closer to the reflector than the side wall of the support, or even closer to the reflector than light sources carried by the side wall of the support forming indirect lighting. This is all the more advantageous when the diffuser has a curve.

BRIEF DESCRIPTION OF THE FIGURES

• figure 1, un dispositif d'éclairage selon un premier mode de réalisation ;
• figure 2, un dispositif d'éclairage selon le premier mode de réalisation et illustré sans son diffuseur ;
• figure 3, une vue éclatée d'un dispositif d'éclairage selon le premier mode de réalisation ;
• figures 4 et 5, une vue de face d'un dispositif d'éclairage selon le premier mode de réalisation et une vue en coupe A-A de la figure 4 ;
• figures 6a et 6b, deux vue en perspective, de dessus et de dessous, d'un réflecteur selon le premier mode de réalisation ;
• figures 7a, 7b et 7c, une vue de face d'un réflecteur selon le premier mode de réalisation et des vues de dessous et de gauche par rapport à cette vue de face ;
• figures 8a, 8b et 8c, deux vues en perspective de dessus et de dessous d'un support d'un dispositif d'éclairage selon le premier mode de réalisation et une vue de face ;
• figures 9a, 9b et 9c, une vue en perspective de dessus d'un support d'un dispositif d'éclairage selon le premier mode de réalisation illustré avec un mécanisme électrique et deux vues en coupe de ce dispositif ;
• figure 10, un dispositif d'éclairage selon un deuxième mode de réalisation ;
• figure 11, un dispositif d'éclairage selon le deuxième mode de réalisation et illustré sans son diffuseur ;
• figure 12, une vue éclatée d'un dispositif d'éclairage selon le deuxième mode de réalisation ;
• figures 13 et 14, une vue de face d'un dispositif d'éclairage selon le deuxième mode de réalisation et une vue en coupe B-B de la figure 13 ;
• figures 15a et 15b, deux vue en perspective, de dessus et de dessous, d'un réflecteur selon le deuxième mode de réalisation ;
• figures 16a, 16b et 16c, une vue de face d'un réflecteur selon le deuxième mode de réalisation et des vues de dessous et de gauche par rapport à cette vue de face ;
• figures 17a, 17b et 17c, deux vues en perspective de dessus et de dessous d'un support d'un dispositif d'éclairage selon le deuxième mode de réalisation et une vue de face ;
• figure 18, une vue éclatée d'un dispositif d'éclairage selon un troisième mode de réalisation
• figures 19a et 19b, des vues de face et en perspective d'un dispositif d'éclairage selon le troisième mode de réalisation et illustré sans son diffuseur ;
• figures 20 et 21, une vue de face d'un dispositif d'éclairage selon le troisième mode de réalisation et une vue en coupe C-C de la figure 20 ;
• figures 22a et 22b, deux vues en perspective, de dessus et de dessous, d'un réflecteur selon le troisième mode de réalisation ;
• figures 23, une vue de face d'un réflecteur selon le troisième mode de réalisation ;
• figures 24a, 24b et 24c, une vue en perspective de dessus d'un support d'un dispositif d'éclairage selon le troisième mode de réalisation illustré notamment avec un mécanisme électrique et sans diffuseur ni réflecteur dans cette vue, et deux vues en coupe de ce dispositif, le diffuseur et le réflecteur étant visibles dans ces deux vues ;

Other features and advantages of the invention will emerge on reading the description which follows, given solely by way of example, with reference to the appended figures, which illustrate:

• figure 1 a lighting device according to a first embodiment;
• figure 2 a lighting device according to the first embodiment and illustrated without its diffuser;
• figure 3 an exploded view of a lighting device according to the first embodiment;
• figures 4 and 5 , a front view of a lighting device according to the first embodiment and a sectional view AA of the figure 4 ;
• Figures 6a and 6b two perspective views, from above and below, of a reflector according to the first embodiment;
• figures 7a , 7b and 7c a front view of a reflector according to the first embodiment and views from below and from the left with respect to this front view;
• Figures 8a, 8b and 8c two perspective views from above and below of a support of a lighting device according to the first embodiment and a front view;
• Figures 9a , 9b and 9c , a perspective view from above of a support of a lighting device according to the first embodiment illustrated with an electric mechanism and two sectional views of this device;
• figure 10 a lighting device according to a second embodiment;
• figure 11 a lighting device according to the second embodiment and illustrated without its diffuser;
• figure 12 an exploded view of a lighting device according to the second embodiment;
• figures 13 and 14 , a front view of a lighting device according to the second embodiment and a sectional view BB of the figure 13 ;
• Figures 15a and 15b two perspective views, from above and from below, of a reflector according to the second embodiment;
• figures 16a , 16b and 16c a front view of a reflector according to the second embodiment and views from below and from the left with respect to this front view;
• Figures 17a, 17b and 17c two perspective views from above and below of a support of a lighting device according to the second embodiment and a front view;
• figure 18 an exploded view of a lighting device according to a third embodiment
• Figures 19a and 19b front and perspective views of a lighting device according to the third embodiment and illustrated without its diffuser;
• Figures 20 and 21 , a front view of a lighting device according to the third embodiment and a sectional view CC of the figure 20 ;
• Figures 22a and 22b two perspective views, from above and from below, of a reflector according to the third embodiment;
• figures 23 a front view of a reflector according to the third embodiment;
• figures 24a , 24b and 24c a perspective view from above of a support of a lighting device according to the third embodiment illustrated in particular with an electric mechanism and without diffuser or reflector in this view, and two sectional views of this device, the diffuser and the reflector being visible in these two views;

For the sake of clarity, identical or similar elements are marked with identical reference signs throughout the figures.

DETAILED DESCRIPTION OF AN EMBODIMENT

The figures illustrate several embodiments: Figures 1 to 9 illustrate a first embodiment, the Figures 10 to 17 illustrate a second embodiment, and the Figures 18 to 24 illustrate a third embodiment.

The first embodiment is that of a lighting device 1 provided with a support 2, said support 2 having a substantially plane rear wall 3 comprised in a reference plane P and four lateral walls 4 delimiting an interior space 5, the side wall 4 delimiting, on a side opposite to the rear wall 3, a closed contour 6 of an opening 7.

In this first embodiment, the support 2 has a section in a plane parallel to the substantially rectangular reference plane P delimited by the four lateral walls 4.

The lighting device 1 further comprises a lighting system 8 comprising an electric mechanism 9 supplying a plurality of light sources 10 which are carried by the side walls 4 of the support 2. The light sources 10 are oriented towards the light source. internal space 5 of the support 2 and distributed along only a part of the closed contour 6. In particular, the light sources 10 are distributed over two of the four side walls 4, these two side walls 4 being the two walls vis-à-vis - in the direction of the length of the support 2.

The distance separating the two lateral walls 4 facing each other in the direction of the length of the support 2, that is to say longitudinally, and carrying the light sources substantially defines the width of the support 2 and the distance separating the two other lateral walls 4 extending transversely in the width direction defines the length of the support 2.

More precisely, the light sources 10 are light-emitting diodes (LEDs) here, all the LEDs carried by the same side wall 4 being then carried by a printed circuit board 16 (PCB) which is held against the side wall 4 question of the side of the interior space 5 by fixing means 17.

These fastening means 17 may, in a simple manner, be formed by the assembly of the elements of the lighting device 1 between them, in particular by a reflector 12 coming, in this assembled position, to press the printed circuit board 16 against the side wall 4 which carries it.

The support 2 may be for example aluminum and / or Zamak. These materials offer better evacuation of the heat generated by the LEDs.

To improve the luminous intensity while avoiding any dazzling of a user, the lighting device 1 is provided with collimators 15 so as to direct the light rays of the light sources towards the reflector 12.

These collimators 15 are here collimating lenses arranged opposite each of the light sources 10.

In this embodiment, the collimators 15 are formed by an elongated bar-shaped member made of polycarbonate or polymethylmethacrylate. Such pieces of elongated shapes, here monobloc, are arranged facing the light sources 10 so that each of them covers all LEDs carried by the same longitudinal side wall 4. Is illustrated on the figure 5 a sectional view transverse of this collimator 15, of solid and elongated form. Thus in this cross section, its section is such that the collimator 15 allows, after being crossed by the light rays, to direct these light rays so that they are parallel to each other and substantially perpendicular to the side wall 4 which carries the light sources 10 which generates these said rays.

In this way the collimators 15 can channel and focus the light flux to the reflector 12, without risk of glare.

Furthermore, in this cross section, the collimator is formed by a trapezoidal structure having a large base and a small base, the large base being contiguous on the side of the lens wall facing the interior space 5 and the small base being located on the LED side, the trapezoidal structure further having in this section a cavity opening at its small base, rectilinear cavity extending perpendicular to the side wall 4 associated.

This cavity has a bottom of substantially convex shape. This cavity is further dimensioned so that an LED can penetrate all or part of it, so as to bring the collimator 15 closer to the side wall 4.

A diffuser 11 is arranged to close the opening 7 of the support 2 and adapted to be traversed by the light rays.

The reflector 12 is located in the interior space delimited by the support 2 and the diffuser 11 to reflect the light rays coming from the light sources towards the diffuser 11.

The reflector 12 has in a section defined in a sectional plane perpendicular to the reference plane P, a concave shape oriented on the side of the rear wall 3.

The reflector 12 delimits, with the support 2, a chamber 13 inside which the electrical mechanism 9 is housed. In an assembled configuration, the reflector 12 covers said electrical mechanism 9 arranged in such a way that it is substantially centered by relative to the two longitudinal side walls 4 of the support 2 in its interior space 5.

In this first embodiment, the concave shape, that is to say in other words the cavity formed by the reflector 12, is oriented on the side of the rear wall 3 so that said reflector 12 delimits, with this rear wall 3 of the support 2, the chamber 13 inside which is housed the electric mechanism 9.

• une base 121 inférieure maintenue fixe au support 2, de préférence à sa paroi arrière 3, ladite base 121 étant située, dans une position assemblée, au voisinage des deux parois latérales 4 longitudinales portant les sources 10 lumineuses ; et
• une extrémité 122 supérieure disposée, dans la position assemblée, au voisinage du diffuseur 11.

More specifically, the reflector 12, of generally concave shape, has:

• a lower base 121 held fixed to the support 2, preferably to its rear wall 3, said base 121 being located, in an assembled position, in the vicinity of the two longitudinal side walls 4 carrying the light sources 10; and
• an upper end 122 disposed in the assembled position in the vicinity of the diffuser 11.

In the illustrated configuration including figure 5 , even if the reflector 12 has between said end 122 and its base 121 portions said "stairs", the reflector 12 still has a generally concave shape, here schematized by a dashed curve, this generally concave shape having a slope p ₁₂₁ at its base 121 strictly greater than a slope p ₁₂₂ at its upper end 122, that is to say that the slope p ₁₂₁ at its base 121 is more inclined than the slope p ₁₂₂ at level of its upper end 122 relative to the reference plane P.

In this way, and in this sectional view, the concave shape of the reflector 12 generally has a flattened dome shape.

The portions "stairs" allow, unlike a smooth curve, to improve the useful volume of the chamber 13 inside which is housed the electric mechanism 9. Is meant by the term "useful volume" the volume exploitable to accommodate said electric mechanism 9. Indeed, although a space of a certain volume is delimited by the chamber 13, the entire volume is not exploitable. The arrangement in "staircase" allows, at constant total volume, to form a larger useful volume facilitating the establishment of electric mechanism 9 while ensuring an improved configuration to ensure its reflection function.

• des premières portions légèrement ou faiblement inclinées 123 par rapport au plan de référence P, c'est à dire inclinées de quelques degrés, cette inclinaison étant positive d'un angle a' par rapport au plan de référence P et négative d'un angle β' par rapport à la paroi latérale 4 de laquelle proviennent les rayons lumineux qu'elles réfléchissent ; et
• des deuxièmes portions inclinées 124 positivement d'un angle α par rapport au plan de référence P et négativement d'un angle β par rapport à la paroi latérale 4 de laquelle proviennent les rayons lumineux qu'elles réfléchissent (voir en particulier figure 5).

In particular, this "staircase" shape is obtained because the reflector 12 has in this same section perpendicular to the reference plane P:

• first portions slightly or slightly inclined 123 relative to the reference plane P, that is to say inclined by a few degrees, this inclination being positive by an angle a 'with respect to the reference plane P and negative by an angle β with respect to the lateral wall 4 from which the light rays which they reflect originate; and
• second inclined portions 124 positively at an angle α with respect to the reference plane P and negatively at an angle β with respect to the side wall 4 from which the light rays which they reflect (see in particular figure 5 ).

• strictement positive (c'est-à-dire α'>0) ; et
• strictement inférieure à l'inclinaison α des deuxièmes portions inclinées 124 (c'est-à-dire α'< α);
  ceci par rapport au plan de référence P. Ainsi on comprendra par le vocable « faiblement inclinées » relatif au premières portions 123 le fait qu'elles sont inclinées de quelques degrés et moins inclinées que les deuxièmes portions inclinées 124. Par le vocable « quelques degrés » est entendu moins de 10 degrés, de préférence entre 0.5 et 5 degrés.

In particular, the first portions 123 are not parallel to the reference plane P, this slight inclination to reflect a minimum of light so as not to create a dark area, or less light, on the surface of the reflector 12, such dark areas being visible on the reflector 12 if α 'is less than or equal to 0. This results in an inclination α' of the first portions 123 which is:

• strictly positive (that is, α '>0); and
• strictly lower than the inclination α of the second inclined portions 124 (that is to say α '<α);
  this with respect to the reference plane P. Thus it will be understood by the term "slightly inclined" relative to the first portions 123 the fact that they are inclined by a few degrees and less inclined than the second inclined portions 124. By the term "a few degrees Is understood to be less than 10 degrees, preferably between 0.5 and 5 degrees.

In our case, the sum of the values of the angles α and β, such as that of the angles α 'and β', is equal to 90 degrees because the side walls 4 are erected perpendicularly to the rear wall 3. Preferably, these second portions inclined 124 have an inclination angle α between 20 and 70 degrees relative to the reference plane P and preferably between 40 and 50 degrees. In this embodiment, the values of the angles α and β are both equal to 45 degrees, in absolute value.

• plus les premières portions faiblement inclinées 123 sont proches de la base 121, c'est-à-dire aussi éloignées de l'extrémité 122 supérieure, et plus leur longueur est petite ; et
• plus les deuxièmes portions inclinées 124 sont proches de la base 121, c'est-à-dire aussi éloignées de l'extrémité 122 supérieure, et plus leur longueur est grande ; et

Moreover, and so that the concave shape has a flattened dome shape:

• more the first slightly inclined portions 123 are close to the base 121, that is to say as far from the upper end 122, and their length is smaller; and
• more the second inclined portions 124 are close to the base 121, that is to say, as far away from the upper end 122, and their length is greater; and

The support 2 being of rectangular shape, the reflector 12 has a shape having a plane of symmetry, this plane of symmetry being defined by a plane perpendicular to the reference pan P and passing through its end 122.

The illustrated section figure 5 is therefore substantially the same at any point along the length of the reflector 12, except for the vicinity of the lateral transverse walls 4 forming the width of the support 2.

Moreover, the electric mechanism 9 comprises at least one supply circuit 91 of the lighting system 8 and a control or control circuit 92 of the light sources 10.

Whatever the embodiment, the supply circuit 91 is housed in the chamber 13. However, in certain configurations certain operating constraints may require placing the control or control circuit 92 wholly or partly outside. of this room 13.

A control or control circuit 92 may be formed by one or more circuit (s) in the form of an additional block (s), in order to ensure one or more particular control or control function (s) ( s) according to the use of the lighting device 1.

For example, a control or control circuit 92 may comprise a circuit, attached to the power supply circuit 91, for actuating the ignition, or energizing, of the light sources when the presence of a user is detected. The control or control circuit 92 may also comprise, in addition or alternatively, a circuit for switching on the light sources 10 when the ambient brightness decreases below a predetermined threshold value.

In particular are illustrated (see Figures 9A , 9B and 9c ) a supply circuit 91 and a control circuit 92. The supply circuit 91 is located in a first zone Z1 adjacent a side of the support forming a width thereof. A number of traditional electronic components compose it, these being fixed on a first printed circuit 910.

The control or control circuit 92 is here located in a second zone Z2 of the interior space 5 of the support 2, opposite to the first zone Z1. This control or control circuit 92 here comprises two printed circuits electrically connected to one another, a high frequency detector 921 being attached to one of these printed circuits and an infrared transmitting / receiving device 922 being arranged on the other 920 of these printed circuits.

The infrared transmitting / receiving device 922 is placed so as to be in the vicinity of the lateral wall 4 forming the width of the support 2, that is to say not carrying a light source, and so as to be placed at the near the upper end 122 of the reflector 12 arranged, in the assembled position, in the vicinity of the diffuser 11.

Opposite this infrared transmitting / receiving device 922 and between the latter and the diffuser 11 is placed a part of the reflector 12. Locally at this point infrared rays of the infrared transmitting / receiving device 922 must be able to circulate. In this embodiment, and locally at this infrared transmission / reception device 922, the reflector 12 has a transparent portion see translucent so as to ensure the proper operation of the device. Alternatively, the reflector 12 may present locally at this infrared transmission / reception device 922 one day, that is to say that there is no material between said infrared transmission / reception device 922 and the broadcaster.

A connector block separates, in the interior space 5, the first and second zones Z1, Z2 from one another. This block has here at an upper wall abutment on which the reflector 12 bears at its upper end 122, the side of the chamber 13 and in the assembled position, so as to ensure the proper implementation of the reflector 12 in the interior space 5 of the support 2.

Such a control or control circuit 92 makes it possible to actuate the ignition, or the power up, of the light sources when the infrared transmitting / receiving device 922 detects the presence of a user.

Due to its configuration, and during its operation, the light rays emitted by an LED are channeled by the collimator lens 15 located closest to these LEDs. All the spokes are mastered and they are all sent on an inclined portion 123, 124 of the reflector 12. No ray comes out of the inner space 5 of the support 2 without having been reflected on at least one wall of the reflector 12. The light rays are sent as perpendicularly as possible on the diffuser 11 relative to the reference plane P which reduces the risk of glare. The rays then pass through the diffuser 11 opalescent, or transparent according to the desired rendering and the desired performance, without particular shape not to change again the light intensity of the rays. In this way, it is possible to control the illumination and the glare of the LEDs in a product of reduced thickness.

The support 2 further has at its lateral walls 4 projecting from the outside of the support, cooling ribs 18 (see for example figure 2 ) so as to increase the surface dimension of the outer surface in contact with the ambient air to improve the heat exchange.

A second embodiment of the invention is illustrated in the Figures 10 to 17 .

This second embodiment differs from the first embodiment illustrated on the Figures 1-9 essentially by the general forms of the different elements which constitute them.

In particular in this second embodiment, the support 2 has a substantially planar rear wall 3 included in a reference plane P and a single side wall 4 delimiting an interior space 5, the side wall 4 delimiting, on a side opposite to the rear wall 3, a closed circular contour 6 of an opening 7. The support 2 then has a section in a plane parallel to the substantially circular reference plane P delimited laterally by a single lateral wall 4.

As in the first embodiment, the lighting device 1 comprises a lighting system 8 comprising an electric mechanism 9 supplying a plurality of light sources 10 carried by the side wall 4 of the support 2. The light sources 10 are oriented towards the interior space 5 and distributed along this circular closed contour 6. In particular, the light sources 10 are LEDs.

The set of LEDs are carried by the same side wall 4 and distributed over four printed circuits 16 (PCB) held against this side wall 4 and over the entire closed contour 6 of the interior space 5 by fastening means 17 In this way, all the LEDs are oriented substantially towards the center of the circular shape of the support 2. The LEDs are distributed in groups of three LEDs, each group of three LEDs being uniformly distributed around the periphery of the support 2. Here, a circuit printed 16 carries three groups of three LEDs each, the lighting device having exactly thirty-six LEDs.

Collimators 15, in the form of collimating lenses similar to those described in the first embodiment, are arranged next to the LEDs. In particular, each of these collimators 15 are formed by an elongated piece in the form of a full bar in an arc to match the shape of the curvature of the side wall 4 and each cover one of the groups of three LEDs. These collimators 15 are here twelve in number. The collimators 15 are clipped onto the printed circuits 16.

In this way, the collimators 15 also make it possible to channel and concentrate the luminous flux towards the reflector 12 without risk of glare.

A diffuser 11 is arranged to close the opening 7 of the support 2 and adapted to be traversed by the light rays.

The reflector 12 is located in the interior space delimited by the support 2 and the diffuser 11 to reflect the light rays coming from the light sources towards the diffuser 11.

In this second embodiment, the reflector 12 and bordered by another reflector 12 'or peripheral reflector, the latter preferably being made of white polycarbonate, polished-mirror or ice-polish or polished aluminum-mirror. The presence of this peripheral reflector 12 'in combination with the reflector 12 in the center also allows a more homogeneous visible rendition through the diffuser for a user when the lighting device is off due to the presence of reflective surfaces with the illumination ambient.

This peripheral reflector 12 'is here maintained by the diffuser 11 and more precisely by contact with its outer flange.

Indeed, the peripheral reflector 12 'has substantially a cup shape intended to be housed substantially in the bottom of the interior space 5 of the support 2, that is to say in the vicinity of the rear wall 3, and presents centered in its center a circular opening to inside which the reflector 12 is placed by cooperating with an edge of this circular opening.

• une base 121 inférieure maintenue fixe par l'assemblage du dispositif d'éclairage 1, en particulier en étant plaqué par le réflecteur périphérique 12' contre la paroi arrière 3, ceci formant moyen de maintien 14 ; et
• une extrémité 122 supérieure disposée, dans la position assemblée, située au voisinage du diffuseur 11.

Furthermore, the reflector 12 has a generally concave shape comprising:

• a lower base 121 held fixed by the assembly of the lighting device 1, in particular by being plated by the peripheral reflector 12 'against the rear wall 3, this forming holding means 14; and
• an upper end 122 arranged, in the assembled position, located in the vicinity of the diffuser 11.

The reflector 12 has in the section defined in the plane of section substantially perpendicular to the reference plane P (see for example figure 14 ) a concave shape oriented on the side of the rear wall 3, and more precisely a flattened dome shape at its upper end 122.

This concave shape delimits, with the support 2, the chamber 13 inside which the electrical mechanism 9 is housed. In an assembled configuration, the reflector 12 completely covers at least the supply circuit 91 disposed substantially in the center of the support 2 and in its interior space 5.

In this second embodiment, the concave shape is oriented on the side of the rear wall 3 so that said reflector 12 defines, with this rear wall 3 of the support 2, the chamber 13 inside which the electrical mechanism is housed. 9.

In contrast to the first embodiment, in the second embodiment, the reflector does not have a "staircase" configuration. Indeed, here the reflector 12 has a concave shape such as a flattened dome where a slope p ₁₂₁ at its base 121 is always strictly greater than a slope p ₁₂₂ at its upper end 122, that is to say more inclined relative to the reference plane P.

Since the support 2 is circular in shape, the support 2 as well as the reflector 12 has a shape comprising an axis of symmetry Δ, this axis of symmetry Δ being defined by an axis of revolution perpendicular to the reference pan P and passing through the center of the circular shape, the assembly of the support 2 and the reflector 12 being such that they are assembled coaxially with respect to this axis of symmetry Δ.

Furthermore, the electric mechanism 9 comprises at least one supply circuit 91 of the lighting system 8 and a control or control circuit 92 of the light sources 10 (not shown in these FIGS. Figures 10-17 ).

A third embodiment of the invention is illustrated in the Figures 18 to 24 .

This third embodiment differs from the second embodiment illustrated on the Figures 10-17 essentially in that it further comprises direct lighting sources.

Indeed, the lighting system comprises, in addition to light sources 10 carried by the lateral wall 4 of the support 2 forming the indirect lighting, light sources 10 'carried by the rear wall 3 and directed towards the space 5 directly to the diffuser 11, these sources 10 'of light being fed by the same electrical mechanism 9 as that supplying the sources 10 of light forming indirect lighting.

These other sources 10 'of light carried by the rear wall 3 are similar to the light sources 10 carried by the side wall 4. Indeed, the sources 10' of the direct lighting are carried by printed circuits 16 'which are maintained fixed against, and intimate contact with the rear wall 3 of the support 2 on the interior space side 5, these sources 10 'of light being light emitting diodes.

These 10 'light sources are located facing the openings 120' of the peripheral reflector 12 ', these orifices 120' being disposed on a flat portion and parallel to the reference plane P. This portion may optionally have a slight inclination, to know a few degrees.

The printed circuits 16 'are here placed directly between the rear wall 3 and a flat portion of the peripheral reflector 12', each orifice 120 'being of oblong shape and placed opposite three LEDs. In addition, each group of three LEDs is carried by the same printed circuit board 16 '.

The printed circuits 16 'are interconnected by electronic plies and are arranged substantially in a circle coaxially with respect to the axis of symmetry Δ, that is to say that the LEDs of the direct lighting are arranged around of the reflector 12, between said reflector 12 and the side wall 4.

The ideal in fact is that these sources 10 'of light are arranged so that their spacing with the diffuser 11 is the largest, that is to say here the closer to the center (crossed by the axis of symmetry Δ). This substantially annular zone between the reflector and the side wall 4 thus allows advantageous location of the LEDs to obtain a rendering without visible point by the user, the lighting device 1 thus maintaining its uniform visual appearance over the entire surface of the diffuser when said lighting device 1 is turned on.

• un diamètre intérieure D₁, égale à 136 mm, correspondant sensiblement au diamètre extérieur du réflecteur 12 et ;
• un diamètre extérieur D₂, égale à 200 mm, correspondant sensiblement au diamètre intérieur de la forme cylindrique formé par la paroi latérale 4 auquel a été retranché deux fois l'épaisseur d'une lentille collimatrice 15 dirigeant les rayons lumineux des sources 10 lumineuses vers le réflecteur 12.

More precisely, this annular zone corresponds here to a zone substantially delimited by (see figure 19b ):

• an inner diameter D ₁ , equal to 136 mm, substantially corresponding to the outer diameter of the reflector 12 and;
• an outer diameter D ₂ , equal to 200 mm, substantially corresponding to the internal diameter of the cylindrical shape formed by the side wall 4 to which twice the thickness of a collimating lens 15 has been directed, directing the light rays from the light sources towards the reflector 12.

The oblong orifices 120 'are uniformly distributed around the reflector 12 in this annular zone and each elongate along tangents to a circle of radius between D ₁ and D ₂ (preferably closer to D ₁ than D ₂ to ensure a spacing with the diffuser 11 greater compared to the curved shape of the diffuser), the thirty-six LED light sources 10 'being located substantially along this circle coaxial with the axis of symmetry Δ. The LEDs have a minimum spacing between them of 10 mm, all of these LEDs providing illumination of 45 x 36 lm (lumen), that is to say 1620 lm, or 1620 cd.sr.

Furthermore, the diffuser 11 has a curve oriented so as to project substantially with respect to the lighting device 1 increasing the volume of the interior space 5. The diffuser is also identical to that illustrated in the second embodiment of the invention. 'invention. This curvature here makes it possible to substantially increase the distance between the diffuser 11 and the sources 10 'of direct lighting without requiring the modification of the dimensions of the support 2 and thus avoid any risk of glare.

The reflector 12 here exclusively reflects the light rays emitted by the sources 10 carried by the side wall 4, the sources 10 'carried by the rear wall 3 being oriented, and their rays directed, directly towards the diffuser 11.

Are visible in particular in figures 24a , 24b and 24c an electric mechanism 9, which notably comprises a circuit power supply 91 of the lighting system (see figure 24b and 24c ) and a control circuit or control 92 sources 10, 10 'of light (see figure 24c ).

The supply circuit 91, comprising a printed circuit 910 carrying the various electronic components, is located entirely under the reflector 12, in the chamber 13.

Furthermore, the reflector 12 has at its upper end 122 a flat wall parallel to the reference plane P. A control or control circuit 92 is here provided, outside the chamber 13, on the reflector 12.

Indeed, to be able to provide a detection function of the control or control circuit 92, the reflector must not form a screen blocking the transmission and transmission of the signal. The control or control circuit 92 is therefore positioned outside the chamber but remains inside the space delimited by the support 2 and the diffuser 11. The curve of the diffuser 11 also offers a greater internal volume 5 important to place said control circuit or control 92 between the upper end 122 of the reflector 12 and said diffuser 11.

An alternative solution is to configure the flat wall located at the upper end 122 of the reflector 12 so that it is at least locally open, transparent, or at least translucent. In such a configuration, the control or control circuit 92 may be positioned partially or totally in the chamber 13.

Furthermore, the support 2 of the lighting device 1 has at its side walls 4 cooling ribs 18 (see for example figure 17b ) so as to increase the surface dimension of the outer surface in contact with the ambient air so as to also improve the heat exchange. These cooling ribs 18 are protruding with respect to the lateral wall 4 from the outside of the support 2, opposite to the interior space 5 of the support. These cooling ribs 18 are covered by a ring-shaped circular wall, said circular wall having a cooling function comparable to the cooling ribs 18 and being formed in the same material, here aluminum or Zamac.

In this configuration, the heat is, on the one hand, discharged by the outer surfaces directly in contact with the outside, and on the other hand, this heat evacuation is favored by the material of the support itself.

The peripheral reflector 12 'has a wall intended to cover it forming locally on the periphery of the lighting device 1 a trim adjacent to the diffuser 11.

The light-emitting diodes attached to the printed circuits 16, which are in close contact with the support 2, at the inner surface of its side wall 4 also improves this thermal diffusion between the support 2 and the external medium. This heat evacuation is similar between the LEDs fixed on printed circuits 16 'in intimate contact with the support 2, at the inner surface of its rear wall 3.

In general, other embodiments can be envisaged, in particular by their shapes. In particular, the closed contour 6, in addition to the illustrated rectangular and circular shapes, may be non-limitatively oval, square, triangular, hexagonal, octagonal, .... The overall architecture of the lighting device remains substantially similar to the forms used.

Furthermore, it can be envisaged the use of a thermally conductive heat tab between the printed circuit (s) 16 carrying the light sources 10 and the support 2.

The lighting device 1 may also comprise additional orientation means of the light rays such as streaks located on the diffuser, or even by the presence of adjustable flaps forming locally reflector wall so that the orientation of the flaps concomitantly or independently from each other allows the control of the orientation of the luminous flux.

Moreover, the possibility of direct lighting can also be provided regardless of the general shape of the lighting device and not only in the case of a lighting device having an axis of symmetry. For example, in the case of the first embodiment, such sources of illumination 10 'could be positioned in a similar manner, for example at the level of orifices situated on a flat portion of the base 121 of the reflector 12.

Although a "stepped" configuration of the reflector 12 is only illustrated here in the first embodiment, such a configuration could also be envisaged in the other embodiments and some are the general shapes of the closed contour (circular, oval, triangular, square, hexagonal, ...).

These lighting devices 1 can also be autonomous and include batteries, especially under the reflector namely in the chamber 13, for use in emergency lighting.

The invention is described in the foregoing by way of example. It is understood that the skilled person is able to achieve different embodiments of the invention without departing from the scope of the invention.

Claims (13)

Lighting device (1) comprising: a support (2) having a substantially plane rear wall (3) included in a reference plane (P) and at least one lateral wall (4) delimiting an interior space (5), the lateral wall (4) delimiting, an opposite side to the rear wall (3), a closed contour (6) of an opening (7); an illumination system (8) comprising at least one electrical mechanism (9) supplying a plurality of light sources (10) carried by the lateral wall (4) of the support (2), oriented towards the interior space (5); ) and distributed along all or part of the closed contour (6); - a diffuser (11) arranged to close the opening (7) of the support (2) and adapted to be traversed by the light rays; - at least one reflector (12) located in the interior space (5) delimited by the support (2) and the diffuser (11) for reflecting the light rays from the sources (10) of light towards the diffuser (11), the reflector (12) defining, with the support (2), a chamber (13) inside which the electrical mechanism (9) is housed and having a section, in a plane of section substantially perpendicular to the reference plane ( P), the reflector (12) having in this section a generally concave shape oriented on the side of the rear wall (3) so that said reflector (12) delimits, with said rear wall (3) of the support (2), the chamber (13) inside which is housed the electric mechanism (9), the reflector (12) having: o a lower base (121) held fixed relative to the support (2) by holding means (14) and located in an assembled position substantially in the vicinity of the side wall (4); and o an upper end (122) arranged, in the assembled position, in the vicinity of the diffuser (11);
characterized in that the generally concave shape of the reflector (12) has a slope (p ₁₂₁ ) at its base (121) strictly greater than a slope (p ₁₂₂ ) at its upper end (122). Lighting device (1) according to claim 1, characterized in that the chamber (13) inside which the electrical mechanism (9) is housed is delimited substantially exclusively by the reflector (12) and the support (2). ), preferably again by the reflector (12) and the rear wall (3) of the support (2). Lighting device (1) according to one of the preceding claims, characterized in that the electric mechanism (9) has at least one power supply circuit (91) of the lighting system (8) and a control circuit or controlling (92) sources (10) of light. Lighting device (1) according to claim 3, characterized in that the supply circuit (91) comprises at least one accumulator. Lighting device (1) according to any one of the preceding claims, characterized in that the reflector (12) has a section, in a plane of section substantially perpendicular to the reference plane, which has, at least locally, and successively : - first inclined portions (123) of a few degrees, positively with respect to the reference plane (P) and negatively with respect to the side wall (4) from which the light rays they reflect; and second inclined portions (124) positively with respect to the reference plane (P) and negatively with respect to the lateral wall (4) from which come the light rays that they reflect;
the second inclined portions (124) having an inclination strictly greater than the inclination of the first inclined portions (123). Lighting device (1) according to any one of the preceding claims, characterized in that it comprises at least one collimator (15) for directing the light rays from the light sources (10) towards the reflector (12). Lighting device (1) according to claim 6, characterized in that it comprises a plurality of collimators (15), said collimators (15) being collimating lenses arranged facing each of the light sources (10), preferably polycarbonate or polymethylmethacrylate. Lighting device (1) according to one of the preceding claims, characterized in that the light sources (10) are light-emitting diodes, preferably carried by at least one printed circuit (16) which is held against the wall lateral (4) support (2) on the side of the inner space (5) by fastening means (17). Lighting device (1) according to any one of the preceding claims, characterized in that it comprises means for additional orientation of the light rays, preferably streaks on the diffuser. Lighting device (1) according to any one of the preceding claims, characterized in that the support (2) is made of aluminum or Zamak. Lighting device (1) according to any one of the preceding claims, characterized in that the reflector (12) is made of white polycarbonate, mirror-polished or polished-ice or polished aluminum mirror. Lighting device (1) according to any one of the preceding claims, characterized in that the lighting system (8) comprises, in addition to sources (10) of light carried by the side wall (s) (s) ( s) of the support (2), sources (10 ') of light carried by the rear wall (3) and directed towards the interior space (5), preferably directly to the diffuser (11), these light sources being powered by the electric mechanism (9). Lighting device (1) according to claim 12, characterized in that the sources (10 ') of lights carried by the rear wall (3) are closer to the reflector (12) than the side wall (4).

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