FR3007505A1 - LONGITUDINAL LUMINAIRE WITH ADJUSTABLE COLOR TEMPERATURE - Google Patents

Abstract

This luminaire comprises a light source (30) in a first mixing chamber (10) comprising an opening (12) opening into a second mixing chamber and in which a window (14) is placed. The window (14) comprises a material for changing the color temperature (A) of the light of the light source (30) to a distinct color temperature (B), and a plurality of leakage windows (140). The luminaire comprises a pull tab (40) resting against the window (14), comprising metering windows (42) movable in translation relative to the window (14), between a position in which the windows (42) of dosage and the leakage windows (140) are facing and a position in which the dosing windows (42) are remote from the leakage windows (140). The luminaire comprises means for moving the pull tab (40). The dosing windows (42) and the leakage windows (140) extend longitudinally in a direction parallel to the direction in which the pull tab (40) is to be translated.

Description

The present invention relates to a luminaire, substantially longitudinal, adjustable color temperature. To obtain adjustable color temperature lighting, it is known to use several lamps. Each of these lamps is intended to emit light at a predetermined color temperature distinct from that emitted by the other lamps. By modulating the extinction and ignition frequency of each of these lamps, and by mixing the different color temperatures, it is possible to obtain an adjustable overall color temperature.

However, this technique requires the use of several different light sources, which implies a high manufacturing cost. Moreover, in the case of a defective lamp, it is obviously no longer possible to obtain the initial variety of color temperatures. Consequently, solutions for achieving an adjustable color temperature from a single type of light source, i.e. from light sources all emitting in the same wavelength range. predetermined, have been developed. For example, it is known from WO2008149250 an adjustable color temperature illumination system comprising a light source emitting light in a first color temperature, and comprising a luminescent material for converting the first color temperature into a second color temperature. color temperature. Screen means is moved between the light source and the luminescent material to more or less prevent the light emitted by the light source from reaching the luminescent material. The screen means may be segmented into individual segments to mask the luminescent material. However, this solution does not provide a fine and gradual adjustment of the output color temperature, or at least high costs since each segment must be moved individually to obtain a color temperature adjustment. This additional cost is all the more important that the luminaire is of significant size, as is the case for substantially longitudinal luminaires which are generally intended to illuminate large volumes, such as car parks, offices or any other room intended for bring together a large number of people (lecture halls, meeting rooms, etc.). In addition, these longitudinal luminaires are generally intended to operate for long periods. There is therefore the question of the stability over time of the color temperature obtained as a result of adjustment. Also, the present invention aims to overcome all or part of these disadvantages by providing a substantially longitudinal luminaire for a fine, progressive and stable adjustment of the color temperature of the light emitted at the output of this luminaire while presenting manufacturing costs. content. For this purpose, the subject of the present invention is a substantially longitudinal luminaire, characterized in that the luminaire comprises at least one light source, intended to emit light at a predetermined color temperature A, a first mixing chamber, the interior of which is arranged said at least one light source, the first mixing chamber being intended to mix the light emitted by said at least one light source, a second mixing chamber, into which opens an opening defined by the first chamber mixer, the second mixing chamber being adapted to mix the light exiting the first mixing chamber via the opening, the first mixing chamber comprising a window placed in the opening, said window comprising a material intended to modify the predetermined color temperature A of the light emitted by said at least one light source at a temperature of a predetermined predetermined color B, and a plurality of escape windows for passing a portion of the light emitted by said at least one light source through the window without changing the predetermined color temperature A to the color temperature B predetermined, the fixture further comprising a longitudinal dosing zipper bearing against one side of the pane and for dosing the amount of light passing through the leakage windows, the dosing zipper comprising dosing windows for superimposing all or part of the leakage windows, in which the dosing zipper is movable in translation relative to the window, between a first position in which the dosing windows and the leakage windows are opposite each other and a second position in which the dosing windows are remote from the leakage windows, the luminaire comprising s displacement means for translational movement of the longitudinal pull, and wherein the dosing windows and leakage windows extend longitudinally in a direction substantially parallel to the direction in which is intended to translate the dosing zipper.

Thus, the luminaire according to the invention offers the advantage of being simple invoice thus inexpensive, while offering the possibility of a fine adjustment of the color temperature of the light emitted at the output of the luminaire, taking into account the the orientation of the leakage and dosing windows in a direction parallel to the axis of translation of the pull tab.

As the shape of the leakage windows and dosing windows, as well as their respective arrangement, allow a gradual adjustment of the color temperature, it is possible to use a single dosing zipper to adjust the color temperature. Thus, it further reduces costs without affecting the fineness and progressiveness of the color temperature adjustment. Advantageously, the leakage windows have a decreasing width near at least one of their ends. Thus, the leakage windows widen towards their center and form a narrowing at one or their ends. This makes it possible to introduce additional progressivity and finesse in the metering of the amount of light leaking through the leakage windows. According to one possibility, the leakage windows correspond to oblong slots. Advantageously, the dosing windows have a decreasing width near at least one of their ends. Similarly, this feature allows to introduce more progressivity and finesse in the determination of the amount of light leaking through the leakage windows. According to an advantageous embodiment, the dosing zipper 30 comprises a tongue portion substantially perpendicular to the pull tab, and the displacement means comprise a threaded rod traversing perpendicularly the tongue portion so that the rotation of the threaded rod causes the translation the dosing zipper in a direction substantially parallel to the threaded rod.

A turn made by the threaded rod moves the dosing windows relative to the leakage windows by a predetermined distance p corresponding to the thread of the threaded rod. Thus, this embodiment provides greater finesse of adjusting the color temperature at the output of the luminaire. Advantageously, the threaded rod is at least partially arranged outside the first mixing chamber and the second mixing chamber. Thus, the threaded rod is less exposed to a risk of deformation 10 taking into account the heat generated by the luminaire in operation. This advantageously contributes to a greater stability over time of the color temperature obtained at the output of the luminaire. Advantageously, the tongue portion extends out of the first mixing chamber and the second mixing chamber. Thus, it also makes it possible to limit the risk of deformation of the dosing zipper during operation, so that the adjustment of the color temperature at the output of the luminaire is stable over time. According to an advantageous embodiment, the luminaire comprises a heat sink arranged against the first mixing chamber, and the second mixing chamber comprises a lateral face on which is provided at least one air inlet, substantially in look at the heatsink. Thus, the inlet or openings of air can accelerate the heat dissipation, thus limiting the heat generated during operation. This avoids expansion of the dosing pull and / or the threaded rod. This results in improved stability of the color temperature set by a user. According to one embodiment, the pull tab is opaque or comprises a material intended to modify the predetermined color temperature A in the predetermined color temperature B, and the dosing windows 30 correspond to slots designed to directly pass the light coming from said at least one light source. According to one possibility, the dosing windows comprise a material for converting the predetermined color temperature A to the predetermined color temperature B, and the dosing zipper is translucent or transparent and devoid of a material for converting the color temperature. A predetermined in the predetermined color temperature B except that present in the dosing windows. Other features and advantages of the present invention will emerge clearly from the following detailed description of an embodiment of the invention, given by way of non-limiting example, with reference to the appended drawings in which: FIG. 1 is a perspective view of a luminaire according to one embodiment of the invention, FIG. 2 is a side view of a luminaire according to one embodiment of the invention, FIG. a sectional view along the line I - I of Figure 2 of a luminaire according to one embodiment of the invention, - Figure 4 is a perspective view of a first chamber 15 of mixing a luminaire according to Fig. 5 is an enlarged view of a portion of Fig. 4. Fig. 6 is a view of a detail E of Fig. 4. Fig. 1 shows a luminaire. 1 according to one embodiment of the invention. The luminaire 1 is substantially longitudinal. It extends here in an X direction. It is intended to illuminate a large area such as meeting room, classroom, or even parking, with an adjustable color temperature. The luminaire 1 comprises a first longitudinal mixing chamber 10, a second mixing chamber 20 and a plurality of light sources for emitting light at a predetermined color temperature A. By way of example, the light sources 30 may correspond to light-emitting diodes (LEDs, according to the acronym). These LEDs can be mounted on a circuit 32 printed, PCB type ("printed circuit board") or MCPCB ("metal-core printed circuit board"). The LEDs may be intended to emit blue light, that is to say whose wavelength is for example between 400 nm and 550 nm. The predetermined color temperature A may therefore be greater than 5500 ° K, and for example between 6000 ° K and 7000 ° K.

As shown in FIGS. 3 and 5, the light sources 30 are arranged at the bottom of the first mixing chamber 10. The first mixing chamber 10 is thus intended to mix the light emitted by the light sources 30.

The light sources 30 may be aligned substantially parallel to the first mixing chamber 10. The first mixing chamber 10 defines an opening 12, through which a window 14 is arranged. The opening 12 opens into the second mixing chamber 20. Thus, the second mixing chamber 20 is intended to mix the light coming out of the first mixing chamber 10 via the opening 12. As can be seen in FIG. 1, the second mixing chamber 20 itself can delimit an opening 22 outlet, which is intended to output the mixed light in the second mixing chamber 20.

In this outlet opening 22 can be placed a diffuser 24 which can be transparent or translucent to mask the inside of the second mixing chamber 20. Note that, according to the embodiment illustrated in Figures 1 to 5, the first mixing chamber 10 is integrally contained in the second mixing chamber 20, which advantageously provides a small footprint. In addition, the first mixing chamber 10 and the second mixing chamber 20 can be arranged head to tail. In other words, the opening 12 of the first mixing chamber 10 may open opposite a bottom wall 26 of the second mixing chamber 20. This improves the mixing of the light. Finally, the first mixing chamber 10 and / or the second mixing chamber 20 may comprise at least one inner wall 16, 28 covered by a reflective coating. The first mixing chamber 10 and the second mixing chamber 20 may extend substantially parallel and parallel to the X direction. As illustrated in FIGS. 4 and 5, the window 14 comprises a material intended to modify the temperature of the predetermined color A of the light emitted by the light sources at a predetermined predetermined color temperature B.

This material may correspond to phosphorus. Thus, the window 14 corresponds to a phosphor window. The material can be made in the form of phosphor particles dispersed in the glass 14. By way of example, this material can make it possible to convert the blue light emitted by the light sources into white light whose color temperature (color temperature B predetermined) may be between 1000 ° K and 4000 ° K, and especially between 2000 ° K and 3000 ° K. The window 14 also includes a plurality of leakage windows 140. The leakage windows 140 are intended to allow part of the light emitted by the light sources 30 to pass directly into the second mixing chamber 20 without the predetermined color temperature A of this light being modified by the phosphor of the glass 14. in the predetermined color temperature B. It is thus understood that part of the light emitted by the light sources 30 is intended to pass through the window 14 (other than through the leakage windows 140) while undergoing a modification of its predetermined color temperature A in the color temperature. B predetermined, and that another part of the light emitted by the light sources 30 is intended to pass through the window 14, via the leakage windows 140, without its predetermined color temperature A necessarily being modified in the color temperature B predetermined. Optionally, the leaking windows 140 may comprise a material, such as phosphor, which may be inserted into windows 140 in the form of phosphor particles, for changing the predetermined color temperature A to a predetermined color temperature C distinct from the temperature. of predetermined color B. Be that as it may, two distinct color temperatures are thus intended to be mixed in the second mixing chamber. The luminaire 1 comprises means for assaying the relative portion of these two distinct color temperatures to be mixed in the second mixing chamber. This makes it possible to regulate the color temperature obtained at the output of the luminaire 1. For this purpose, the luminaire 1 comprises a dosing puller 40, bearing against a face, here an upper face, of the window 14. The pull tab 40 is substantially longitudinal. It can advantageously extend substantially parallel to the first mixing chamber. This zipper 40 is intended to dose the amount of light that can pass through the leakage windows 140. The dispensing zipper 40 thus comprises dosing windows 42. These dosing windows 42 are intended to overlap, to overlap, in whole or in part, leakage windows 140. In addition, the dosing zipper 40 is movable in translation relative to the window 14, between a first position in which the dosing windows 42 and the leakage windows 140 are opposite one another, and a second position in which the dosing windows 42 are remote from the leakage windows 140 and in particular between two adjacent leakage windows 140. To move the pull tab 40 in translation on the window 14, the luminaire 1 comprises means for moving the pull tab 40, which will be described in more detail below. As can be seen in FIGS. 4, 5 and 6, the metering windows 42 and the leakage windows 140 all extend longitudinally, rectilinearly, in a direction substantially parallel to the direction in which is intended to be located. translate the dosing zipper 40. This arrangement substantially improves the precision of the dosing between the two color temperatures to be mixed in the second mixing chamber 20, taking into account the translational movement of the dosing zipper 40, parallel to the direction in which these dosing windows 42 and these rectilinear leakage windows 140. In addition, the leakage windows 140 may have a decreasing width near at least one of their ends 142. This corresponds to a progressive widening of the leakage windows 140 from their end 142 towards their center. In particular, the end or ends 142 may have a rounded shape. As can be seen in FIGS. 4 and 5, the leakage windows 140 may have an oblong shape. The leaking windows 140 may correspond to slots 30 formed in the window 14. Similarly, the dosing windows 42 may have a decreasing width near at least one of their ends 420. The end or ends 420 may also have a rounded shape, the dosing windows 42 may have an oblong shape.

As illustrated in Figures 4 and 5, the dosing windows 42 and leakage windows 140 may be of substantially similar shape. They can cover a substantially similar area. The dosing windows 42 and the leakage windows 140 operate in a matched fashion. In other words, they operate in pairs, each pair comprising a metering window 42 cooperating with a leakage window 140 to dose the amount of light of a color temperature other than the predetermined color temperature B which can reach the second chamber 20 mixing.

As can be seen in FIGS. 4 and 5, the leakage windows 140 may be aligned along an axis X 'substantially parallel to the direction in which each of them extends. Similarly, the dosing windows 42 may be aligned along an axis X "substantially parallel to the direction in which each of them extends. confuse with the X axis "alignment of the dosing windows 42. They can also be substantially parallel to the direction in which the first mixing chamber 10 extends. The means for moving the dosing zipper 40 may comprise a motor, a pneumatic or hydraulic jack or an electromagnet. According to the embodiment illustrated in FIGS. 1 to 5, the dispensing zipper 40 comprises a portion 44 forming a tongue. This portion 44 forming a tongue is substantially perpendicular to the pull tab 40. The displacement means may then comprise a threaded rod 50 extending perpendicularly through the portion 44 forming a tongue. Thus, the rotation of the threaded rod 50 causes the translation pull tab 40 to move in a direction substantially parallel to that in which the threaded rod 50 extends. The threaded rod 50 may have a predetermined thread p so as to obtain a fine adjustment, in view of the fact that a turn on itself of the threaded rod 50 displaces the pull tab 40, therefore the dosing windows 42 relative to the leakage windows 140, a distance substantially equal to the predetermined thread p. According to the example illustrated in FIGS. 1 to 5, the threaded rod 50 can cooperate with a threaded hole 27 formed in a side face 29 of the second mixing chamber 20.

The threaded rod 50 may advantageously correspond to a screw comprising a bearing head 52 intended to bear against the portion 44 forming a tongue. This threaded rod 50 can be rotated manually or by means of a motor. On the other hand, although not shown, the fixture 1 may include control means allowing a user to control the rotation of the threaded rod 50. The control means may correspond to contact control means, such as a switch 10 arranged on the luminaire 1, or remote control means, for example by cable connected to a switch, wireless remote control means, by example via a remote control. The threaded rod 50, the metering pull tab 40, the X axis of the leakage window alignment 140, the X axis of the dosing window alignment 42, the first mixing chamber 10 and, if appropriate the second mixing chamber 20 can all extend substantially parallel As is more particularly visible in FIG. 1, and in FIGS. 4 and 5, the threaded rod 50 can be at least partially arranged outside the first chamber 10 and the second mixing chamber 20, to avoid heating and deformation More specifically, the threaded rod 50 can be arranged outside the luminaire 1 to be in contact with the ambient air. Similarly, it will be noted that the tab portion 44 may extend out of the first mixing chamber 10 and the second mixing chamber 20. The tongue portion 44 may in particular be arranged outside the luminaire 1 to be in contact with If necessary, the second mixing chamber 20 may comprise a slot 25 through which the dosing puller 40 slides. As can be seen in FIGS. 3 to 5, the luminaire 1 may comprise a heat sink 18 arranged against the first mixing chamber 10, in particular against the printed circuit 32 supporting the light sources 30. In addition, as shown in FIG. 1, and the second mixing chamber comprises a side face 29 on which is provided at least one air inlet orifice 290, substantially facing the heat sink 18.

In addition, the air inlet louver 290 can be arranged on the same side face 29 as that in which the slot 25 for sliding of the pull tab 40 is formed through the second mixing chamber 20. Thus, the cooling of the heatsink takes place on the side where the metering adjustment mechanism is located, which contributes to more precision and stability of the adjustment. According to the embodiment of FIGS. 4 and 5, the pull tab 40 is opaque, and the dosing windows 42 correspond to slots designed to allow the light coming from the light sources 30 to pass directly into the second mixing chamber 20. Alternatively to an opaque pull tab 40, the pull tab 40 may comprise a material, such as phosphor, which material may be incorporated in the pull tab 40 in the form of phosphor particles, for changing the predetermined color temperature A to the color temperature. B predetermined. The dosing windows 42 correspond to slots for directly passing the light from the light sources 30 into the second mixing chamber 20. The dosing zipper 40 can be metallic or plastic. In another embodiment, the dosing windows 42 comprise a material for converting the predetermined color temperature A to the predetermined color temperature B, and the dosing zipper 40 may be translucent or transparent and devoid of a material. capable of changing the predetermined color temperature A to the predetermined color temperature B except at the dosing windows 42. The dosing windows 42 may in particular be made by screen printing. Of course, the invention is not limited to the above embodiment, this embodiment having been given as an example. Modifications are possible, especially from the point of constitution of the various elements or by the substitution of technical equivalents, without departing from the scope of the invention. 35

Claims (10)

REVENDICATIONS1. Luminaire (1) substantially longitudinal, characterized in that the luminaire comprises at least one light source (30) for emitting light according to a predetermined color temperature (A), a first mixing chamber (10), inside which is arranged said at least one light source (30), the first mixing chamber (10) being intended to mix the light emitted by the at least one light source (30), a second mixing chamber (20) , in which an opening (12) delimited by the first mixing chamber (10) opens, the second mixing chamber (20) being intended to mix the light coming out of the first mixing chamber (10) via the opening (12). ), the first mixing chamber (10) comprising a window (14) placed in the opening (12), said window (14) comprising a material for modifying the predetermined color temperature (A) of the light emitted by said at least one source (30) illuminated at a distinct predetermined color temperature (B), and a plurality of leakage windows (140) for passing a portion of the light emitted by said at least one light source (30) through the window ( 14) without changing the predetermined color temperature (A) to the predetermined color temperature (B), the luminaire (1) further comprising a longitudinal dosage pull (40) bearing against one side of the window (14) and for dosing the amount of light passing through the leakage windows (140), the dispensing pull tab (40) comprising dosing windows (42) for superimposing all or part of the leakage windows (140), in which the dispensing pull tab (40) is movable in translation relative to the window (14), between a first position in which the dosing windows (42) and the leakage windows (140) are opposite one another and a second position in wherein the dosing windows (42) are spaced from the leakage windows (140), the luminaire (1) comprising displacement means for translational movement of the longitudinal pull tab (40), and wherein the dosing windows (42). and the leakage windows (140) extend longitudinally in a direction substantially parallel to the direction in which the dosing puller (40) is to be translated. 2. Luminaire (1) according to claim 1, characterized in that the windows (140) of leakage have a decreasing width near at least one of their ends (142). 3. Luminaire (1) according to claim 2, characterized in that the windows (140) of leakage correspond oblong slots. 4. Luminaire (1) according to one of claims 1 to 3, characterized in that the windows (42) assay have a decreasing width near at least one of their ends (420). 5. Luminaire (1) according to one of claims 1 to 4, characterized in that the pull tab (40) comprises a dosage portion (44) forming a tongue substantially perpendicular to the pull tab (40), and the displacement means comprise a threaded rod (50) perpendicularly traversing the tab portion (44) so that the rotation of the threaded rod (50) causes the dispensing pull tab (40) to move in a direction substantially parallel to the rod (50) threaded. 20 6. Luminaire (1) according to claim 5, characterized in that the rod (50) threaded is at least partially arranged outside the first chamber (10) mixing and the second chamber (20) mixing. 7. Luminaire (1) according to claim 5 or 6, characterized in that the tongue portion (44) extends out of the first mixing chamber (10) and the second mixing chamber (20). 8. Luminaire (1) according to one of claims 1 to 7, characterized in that the luminaire (1) comprises a heat sink (18) arranged against the first chamber (10) of mixing, and the second chamber (20) ) mixing comprises a side face (29) on which is provided at least one inlet (290) of air inlet, substantially facing the heat sink (18). 35 9. Luminaire (1) according to one of claims 1 to 8, characterized in that the pull tab (40) is opaque or comprises a material for changing the predetermined color temperature (A) to the predetermined color temperature B, and the dosing windows (42) correspond to slots designed to directly pass the light coming from said at least one light source (30). 10. Luminaire (1) according to one of claims 1 to 9, characterized in that the dosing windows (42) comprise a material for converting the predetermined color temperature (A) to the predetermined color temperature (B). and in that the dosing zipper (40) is translucent or transparent and devoid of a material for converting the predetermined color temperature (A) to the predetermined color temperature (B) except that present in the windows (42) dosing.