AT16635U1 - lamp - Google Patents

Abstract

The invention relates to a luminaire (1) comprising a bowl-shaped reflector (2) with a circumferential reflector wall (5) which extends away from a base region (3) and which has a light exit surface (4) on its side opposite the base region (3). limited, and a hollow body (6) extending from the bottom region (3) into the reflector (2) and towards the light exit surface (4) and open on both sides with respect to its longitudinal axis (L), with the circumference of the hollow body (6) Distributed lamps (7) are provided such that they are in thermal contact with the hollow body (6) and at least partially emit light laterally onto the reflector wall (5).

Description

description

LAMP The present invention relates to a lamp with a cup-shaped reflector for directional light emission via a light exit surface of the reflector with a preferably defined tear-off edge of the light emission.

Such lights have so far been operated using high-pressure lamps, which allow a defined light distribution with a sharp tear-off edge. Such lights are used, for example, as floodlights in the form of pendant lights. They provide a particularly high amount of light. For example, light intensities of up to 20,000 lumens can be achieved. Due to legal requirements, however, such high-pressure lamps will only be available until the end of 2016.

The present invention now aims to provide a comparable lamp that does not use high-pressure lamps.

[0004] This object is achieved by the subject matter of the independent claim. The dependent claims develop the central idea of the present invention in a particularly advantageous manner.

According to a first aspect, the present invention relates to a luminaire with a bowl-shaped reflector with a circumferential reflector wall extending away from a bottom region of the reflector and delimiting a light exit surface on its side opposite the bottom region. Furthermore, the luminaire according to the invention has a hollow body which extends from the bottom region into the reflector and towards the light exit surface and is open on both sides with respect to its longitudinal axis. Distributed over the circumference of the hollow body, illuminants are provided in such a way that they are in thermal contact with the hollow body and at least partially emit light radially, that is to say laterally, onto the reflector wall.

By means of the lamp described above, it is possible to emit light in a defined manner via a correspondingly designed reflector via a light exit area delimited by the reflector. The operating temperatures that occur during operation with correspondingly high luminous fluxes are specifically and effectively dissipated by the thermal management provided with this luminaire. For this purpose, the lamp has a quasi tubular hollow body with which the lamps are in direct thermal contact, so that the heat generated during operation of the lamps can be emitted directly to the hollow body. Due to its hollow design, it offers a large surface for dissipating the heat generated during operation. Because of the open design on both sides of the hollow body thermally coupled with the lamps, convection and consequently a so-called chimney effect is achieved, which automatically leads to increased heat dissipation through constant air flow.

[0007] The reflector wall preferably widens to extend away from the base area. In particular, an essentially parabolic cross section is provided here. A bowl-shaped reflector designed in this way offers a good possibility for corresponding, directed reflection of the light emitted by the illuminants onto the reflector wall in the direction of the light exit surface.

In particular, the reflector wall is designed in such a way that it directs the light of the illuminants for defined light emission in the direction of or at least partially onto the light exit surface. The light emitted by the illuminants is thus guided in a defined manner and directed towards the light emitting surface, so that a desired emission characteristic can be achieved.

[0009] In a preferred embodiment, the hollow body can be designed to be reflective on its side facing the reflector wall. In particular, this applies at least in

1/10

AT 16 635 U1 2020-03-15 Austrian patent office

Area between the illuminants and the light exit surface, that is, directed towards the light exit surface as seen from the illuminants. This has the advantage that the hollow body can also be used for defined light emission. As a rule, part of the light deflected by the reflector wall is preferably directed in a targeted manner onto the reflecting surface of the hollow body in order to be available for the defined light emission via the light exit surface.

The hollow body is seen in the longitudinal direction of the reflector, preferably arranged centrally to or in the reflector. In this way, a symmetrical design of the luminaire can be achieved, which is also advantageous for a harmonious light emission in addition to aesthetic aspects.

The hollow body preferably extends at least to the light exit surface. In principle, however, the invention is not restricted to this. Due to the length of the extension of the hollow body, this can be designed accordingly in terms of a desired and defined light emission. On the one hand, the hollow body can be kept out of the light path of the light once reflected by the reflector. In this case, the hollow body does not necessarily have to have reflecting surfaces. On the other hand, it is also conceivable to use the hollow body with a reflective surface for defined light control and thus light emission via the light exit surface. It is also conceivable, for example, not to make the hollow body reflective, especially in defined areas, in order to interrupt the light path at certain angles starting from the reflector wall, which in turn can lead to a correspondingly defined emission of light.

In a preferred embodiment, the hollow body is round, oval or polygonal in cross section. In particular, in the case of a polygonal configuration, a regularly polygonal cross section is advantageous in order to produce a light emission that is as uniform as possible around the circumference.

The reflector and the hollow body are preferably designed to emit the light of the lamps with a defined light emission angle, preferably with a defined tear-off edge, via the light emission surface. The light distribution should preferably be essentially rotationally symmetrical. In this way, a radiation characteristic of a known luminaire can be simulated with high-pressure lamps. The light emission angle is preferably <± 90 °, preferably <± 60 °, particularly preferably <± 45 °, and most preferably <± 30 °, the light emission angles being seen over the circumference and being the same size or circumferential to the respectively opposite directions can also be different from each other. The light emission angle is preferably measured with respect to the main emission direction of the lamp, preferably in or parallel to the longitudinal axis of the hollow body. In the latter case, a change in the light emission angle that is periodic or otherwise uniform over the circumference is preferably conceivable. A completely asymmetrical light emission is also conceivable.

In a preferred embodiment, the illuminants are (directly) provided on the hollow body. The illuminants are preferably provided in the region of the base region of the reflector, that is to say as close as possible to the base of the reflector, in order to be able to provide the entire reflector wall surface for the defined emission of light via the light exit surface.

The lamps are preferably evenly distributed over the circumference of the hollow body and particularly preferably arranged at the same height of the reflector with respect to its longitudinal direction. In this way, the most harmonious and preferably uniform light emission can also be achieved.

According to a preferred embodiment, the lamps are LEDs and in particular LED modules, such as COB-LED modules (COB = Chip-On-Board). These lamps can be made available for delivery - also in conjunction with the reflectors - a correspondingly high amount of light, for example up to 20,000 lumens. These lamps are particularly space-saving and can due to the Invention

2/10

AT 16 635 U1 2020-03-15 Austrian patent office thermal management by the arrangement of the hollow body and its thermal coupling with the lamps can be operated safely.

[0017] The reflector can be designed to be rotationally symmetrical or cyclically symmetrical about its longitudinal axis. In particular, the cyclically symmetrical configuration can be used for a defined and preferably all-round uniform and harmonious light emission.

[0018] In a particularly preferred embodiment, the reflector has a plurality of optical regions all around. In particular, this can be several facet areas. These facet areas can in turn have multiple facets. In this way, a defined and desired light guidance or deflection can be achieved via the reflector wall. Each area of the reflector is optically assigned to one and preferably exactly one lamp.

[0019] In a preferred embodiment, the reflector can have cooling fins extending radially from the hollow body to the reflector wall. These are also preferably thermally coupled to the hollow body. In this way, an even larger surface can be used for heat dissipation of the operating heat of the lamps. The cooling fins can spatially separate the surfaces with the respectively assigned lamps. In a particularly preferred embodiment, the cooling fins can likewise have a reflective surface and can therefore also be used as a further part of the reflector for the defined deflection of the light towards the light exit surface.

Further embodiments and advantages of the present invention are explained using the following exemplary embodiments in conjunction with the figures of the accompanying drawings. Show it:

Figure 1 is a schematic perspective view of a lamp according to a first embodiment of the invention, Figure 2 is a schematic and functional side view of a lamp according to a second embodiment of the invention with exemplary light routing of a lamp, Figure 3 is a schematic and functional top view of a lamp according to a third embodiment of the present invention, and [0024] Figure 4 shows an exemplary light distribution of a lamp according to the invention.

Figures 1 to 3 show schematic embodiments of lights 1 according to the invention. These lights 1 have a substantially bowl-shaped reflector 2. This reflector 2 has a bottom area 3. A circumferential reflector wall 4 extends away from this bottom area 3 and delimits a light exit surface 4 on its side opposite the bottom area 3.

As shown by way of example in FIG. 2, light from this light 1 is emitted to the outside via this light exit surface 4.

As can be seen in particular from FIGS. 1 and 2, the reflector wall 5 preferably extends away from the base area 3. For example, it can have a substantially parabolic cross section, as is shown in particular in FIG. 2 in a side view.

Furthermore, the luminaire 1 has a hollow body 6 which extends from the base region 3 into the reflector 2 and towards the light exit surface 4 and is open on both sides with respect to its longitudinal axis L.

Distributed over the circumference of the hollow body 6, illuminants 7 are provided in such a way that they are in thermal contact with the hollow body 6 and at least partially radiate light radially, ie laterally - onto the reflector wall 5. This is shown by way of example in FIG. 2.

3/10

AT 16 635 U1 2020-03-15 Austrian Patent Office [0030] The hollow body 6 is preferably reflective on its side facing the reflector wall 5. The hollow body 6 can be made of a reflective material or be provided with a reflective surface. The latter can be done by providing an additional reflective element or by coating the surface of the hollow body accordingly. The reflecting surface is provided at least in the area between the illuminants 7 and the light exit surface 4, so that, as shown by way of example in FIG. 2, this can also be used effectively in the light path for directing light.

As can be seen, for example, from FIGS. 2 and 3, the hollow body, viewed in the longitudinal direction of the reflector 2, can be arranged centrally to or in the reflector 2. Depending on the desired light guidance, a different arrangement or orientation of the hollow body 6 with respect to the reflector 2 is also conceivable.

As shown in Figures 1 and 2, the hollow body 6 can preferably extend at least to the light exit surface 4. In this way, the hollow body 6 is not directly visible, for example, in a side view of the luminaire 1, but can at most be used for light control if it is provided with a reflective surface. If the hollow body 6 is not or not partially provided with a reflecting surface, it can be used, for example, to absorb the light striking it and also for the defined emission of light.

As can be seen for example from Figures 1 to 3, the hollow body 6 can be round in cross section. Other forms of embodiment are of course also conceivable. For example, the hollow body 6 can also be oval or polygonal. In the latter case, regular polygonal training is particularly preferred in order to achieve the most harmonious and uniform light emission possible.

The hollow body 6 can have different diameters when viewed in the longitudinal direction or in the direction of its longitudinal axis L. This can be clearly seen, for example, in the side view in FIG. 2. The illuminants 7 can preferably be provided on an area 61 of smaller diameter d, while, for example, an area 62 provided between the illuminants 7 and the light exit area 4, which in particular forms the reflective area of the hollow body 6, can be an area 62 of a larger diameter. Of course, other configurations are also conceivable. In particular, a preferred embodiment of the hollow body 6 can preferably achieve light emission and light control.

The reflector wall 5 is preferably designed in such a way that the light from the illuminants 7 for the defined light output of the lamp 1 is directed in the direction of or at least partially onto the light exit surface 4. The light from the illuminants 7 thus deflected or reflected by the reflector wall can thus be provided, for example, for direct light emission via the light exit surface 4 or can also be directed to further reflector elements - here the reflecting area 62 of the hollow body 6 - in order to define a further deflection there Light output of the lamp 1 to be used.

Overall, the reflector 2 and the hollow body 6 are designed to emit the light of the lamps 7 with a defined light emission angle α via the light emission surface 4. This angle α is preferably defined with respect to the main emission direction H of the lamp 1, which coincides with the longitudinal axis L of the hollow body 6. It is particularly preferred that a defined tear-off edge is provided by the defined light emission angle α in order to achieve a clear light distribution. In other words, the light emission angle α limits a maximum angle. A light distribution provided in this way is shown by way of example in FIG. 4. It can be seen there that the light distribution, seen here to the left and right, is clearly and sharply delimited and thus has a defined maximum light emission angle α. In this way, a dimming effect can be achieved, so that glare can be avoided as safely as possible. The light emission angle α is preferably α <± 90 °, preferably α <± 60 °, particularly preferably α <± 45 ° and most preferably α <± 30 °. The light emission angle α is included

4/10

AT 16 635 U1 2020-03-15 Austrian patent office freely selectable via reflector 2 and hollow body 6. For example, a rotationally symmetrical, uniform and harmonic light emission can be provided. However, it is also conceivable that the light emission angle α is different, for example on opposite sides of the lamp 1 and / or viewed over the circumference of the lamp 1. The transition of the light emission angles α over the circumference can optionally be designed in a harmoniously uniform manner or at least partially also in a step-like manner or in some other way. The invention is not limited to a specific light emission angle α.

As can be clearly seen, for example, from FIG. 3, the illuminants 7 can be (directly) provided on the hollow body 6. In this way, a safe and effective thermal coupling is provided.

The illuminants 7 are preferably provided in an area - that is, in the vicinity of the - floor area 3. In other words, with respect to the longitudinal axis L of the hollow body 6, the illuminants 7 are preferably located in an axial end or side of the hollow body 6 facing the base region 3. In this way, the illuminants 7 are preferably provided in a foot of the reflector 2, so that essentially the entire reflector wall 5 can be used for light emission and light control. However, other positions of the lamps 7 with respect to the longitudinal axis L of the hollow body 6 are of course also conceivable.

As can be seen, for example, in FIG. 3, the lamps 7 can be distributed uniformly over the circumference of the hollow body 6 and preferably be arranged at the same height X of the reflector 2 with respect to its longitudinal direction L (see FIG. 2). This is particularly desirable in order to achieve uniform and harmonious light emission. Of course, other arrangement positions of the illuminants 7, in particular on the hollow body 6, are also conceivable.

As can be seen from FIGS. 1 to 3, the illuminants are provided in particular by LEDs. Here, LED modules are shown as examples, particularly in the form of COB LED modules. Of course, the illuminants 7 could also be provided by others - in particular LED illuminants. The configuration as an LED module should be used in particular because of the directional light emission - here on the reflector wall 5. Likewise, LEDs are quite compact in their design. The thermal management used for the luminaire of the present invention by means of the convection-promoting hollow body 6 also ensures sufficient heat dissipation of the heat generated during operation of the LED modules 7.

The reflector 2 is preferably designed to be rotationally symmetrical or at least cyclically symmetrical about its longitudinal axis L in order to be able to achieve a particularly uniform light emission.

As can be seen particularly in FIGS. 1 and 3, the reflector 2 can also have a plurality of optical regions 20 all around. As shown in FIG. 3, these can also be facet areas, for example, which can likewise have multiple facets. These areas 20 ultimately form the reflector wall 5, which face the interior of the reflector and thus the hollow body 6 or the illuminants 7. In a preferred embodiment, each of the aforementioned optical regions 20 of the reflector 2 is optically assigned to a lamp 7. In other words, an illuminant 7 preferably emits its light at least substantially in one direction of one of the aforementioned optical regions 20. In this way, a defined light control and the most harmonious light emission can be achieved.

As can be seen in particular in FIG. 1, the reflector 2 can have cooling fins 8 extending radially from the hollow body 6 to the reflector wall 5. These are particularly preferably thermally coupled to the hollow body 6. As shown in FIG. 1, the cooling fins 8 can spatially cover the areas 20 with the respectively assigned lamps 7

5/10

AT 16 635 U1 2020-03-15 separate the Austrian patent office from one another in order to use the illuminants 7 to guide and define the direction of light and ultimately to emit light from the luminaire 1. It is conceivable for the cooling fins 8 to be at least partially reflective. In other words, the cooling fins 8 preferably have an at least partially reflective surface and can therefore also be used for defined light control.

A preferred luminaire 1, as shown for example in FIG. 1, thus has in the bowl-shaped reflector 2 a hollow body 6 which extends longitudinally therein and at the foot of which laterally illuminating LED lamps 7 are preferably provided. Thus, a light radiation emanating essentially from the center of the reflector 2 can be provided on all sides of the reflector 2 as far as possible. The light emitted by the illuminants 7 then hits the reflector wall 5 of the reflector 2 at least in part and is deflected upwards toward the light exit surface 4. If desired, the light can, on the one hand, leave the lamp 1 directly from the illuminant 7 via the light exit surface 4 and thus be ready to emit light. On the other hand, the light which is reflected on the reflector 2 or its reflector wall 5 - that is to say deflected - can be directed directly to the light exit surface 4 in order to be ready for the light from the lamp 1 to be emitted there. However, it is also conceivable that at least part of the light deflected by the reflector 2 hits the hollow body 6; in this case in particular in an area between the illuminants 7 and the light exit surface 4. There, the light can preferably be reflected again on the hollow body 6 in order to be available for emitting light via the light exit surface 4. However, the hollow body 6 can also be used partially for light absorption in order to bring about a defined light emission in this way as well. The design of both the hollow body 6 and the reflector 2 is such that a defined light emission angle α is not exceeded as far as possible and thus a defined tear-off edge of the light emission can be set in a targeted manner in order to preferably bring about a defined dimming effect of the lamp 1. Likewise, a desired peak angle for certain color ranges can be set as desired via the geometric shape of the reflector 2 and the hollow body 6 in cooperation with the lamps 7.

The present invention is not limited to the previous exemplary embodiments. In particular, the individual features of the above-described exemplary embodiments can be interchanged and / or combined with one another in any manner. For example, the geometric shape of the aforementioned elements is not restricted by the invention. Likewise, the number of lamps 7 or optical areas 20 is not limited by the invention. In the figures, six illuminants 7 and six optical areas 20 are shown. However, eight illuminants 7 and eight optical elements 20 or any other number can preferably be provided.

Claims (10)

Expectations 1. luminaire (1), comprising: a bowl-shaped reflector (2) with a circumferential reflector wall (5) which extends away from a floor area (3) and which delimits a light exit surface (4) on its side opposite the floor area (3), one from the floor area (3) into the Reflector (2) and hollow body (6) which extends longitudinally towards the light exit surface (4) and is open on both sides with respect to its longitudinal axis (L), illuminants (7) distributed over the circumference of the hollow body (6) being provided in such a way that they are in thermal contact with the hollow body (6) and at least partially emit light laterally onto the reflector wall (5). 2. Light (1) according to claim 1, wherein the reflector wall (5) extends away from the bottom region (3), preferably with a substantially parabolic cross section. 3. Luminaire (1) according to claim 1 or 2, wherein the reflector wall (5) is designed to direct the light of the lighting means (7) for defined light emission in the direction of or at least partially on the light exit surface. 4. Luminaire (1) according to one of the preceding claims, wherein the hollow body (6) on its side facing the reflector wall (5) is designed to be reflective, preferably at least in the region between the lamps (7) and the light exit surface. 5. lamp (1) according to any one of the preceding claims, wherein the hollow body (6) in the longitudinal direction of the reflector (2) is arranged centrally to or in the reflector (2). 6. lamp (1) according to any one of the preceding claims, wherein the hollow body (6) extends at least to the light exit surface. 7. lamp (1) according to any one of the preceding claims, wherein the hollow body (6) is round, oval or polygonal, in particular regularly polygonal, in cross section. 8. lamp (1) according to one of the preceding claims, wherein the hollow body (6) has different diameters seen in the longitudinal direction, the lamps (7) are preferably provided on an area (61) of smaller diameter d and one between lamps (7) and area (62) provided for the light exit area, in particular the reflecting area of the hollow body (6), has an area (62) of larger diameter D. 9. lamp (1) according to any one of the preceding claims, wherein the reflector (2) and the hollow body (6) are designed such that the light of the lamps (7) with a defined light emission angle a, preferably with a defined tear-off edge, over the light emission surface to deliver, preferably with an essentially rotationally symmetrical light distribution. 10. Light (1) according to one of the preceding claims, wherein the reflector (2) radially extending from the hollow body (6) to the reflector wall extending cooling fins (8) which are thermally coupled to the hollow body (6).