EP2796779B1 - Light with optical system for emitting light over an elongated light emission opening - Google Patents

Description

The present invention relates to a luminaire with a luminaire housing, which has an elongate light exit opening, wherein an optical system is provided for influencing the light emitted via the light exit opening. In particular, the light exit opening of the lamp should be very narrow.

For example, the WO 2012/152536 A1 a lighting device comprising a housing body, a reflection structure and a plurality of light sources, the housing body comprising a cover, side walls and a light outlet opposite the cover, the reflection structure comprising two first reflectors and a second reflector, the two first reflectors on two opposite side walls are each provided, wherein each of the first reflectors comprises a plurality of first reflector bodies and each of the first reflector body is provided with a light source and the second reflector is provided on the cover, wherein the first reflectors reflect light from the light sources to the second reflector and the second Reflector in one direction to the light outlet reflects the light.

In addition, the reveals US 2010/0284181 A1 a light fixture comprising a support base and at least one LED on the support base emitting light. A first reflector is curved between a first lip and a second lip, wherein an axis of a generated light cone intersects the first reflector between the first and second lips. A second reflector defines a reflective enclosure and includes first and second flat surfaces on opposite sides of the LED, the first reflector being oriented to reflect light from the LED and the second reflector.

Furthermore, the disclosure WO 2008/137824 A1 a light fixture comprising a light emitter coupled to a housing and configured to emit light, and further comprising a reflector. The reflector has a reflective surface which is in the light path of the light emitted by the light emitter is provided, wherein the reflective surface comprises a first parabolic portion to reflect a first portion of the light. The reflective surface further includes a second parabolic portion adjacent the first parabolic portion, said second parabolic portion reflecting a second portion of light, the second parabolic portion having a greater focal length than the first parabolic portion.

Of the DE 20 2011 003 261 U1 a luminaire insert, in particular for a floor lamp, can be removed.

The starting point for the present invention is the problem of lighting workplaces. In order to be able to work efficiently, for example, at an office workplace, a suitable lighting of the workplace is required, and corresponding standards exist for this purpose. Already in the planning of lighting systems for lighting office space, the position of the workstations, so for example, the desks is taken into account and the position and design of the lights is designed accordingly. Pendant luminaires are often used, which have a smaller distance to the desk surface compared to ceiling-mounted luminaires, which facilitates more efficient lighting of the workplace.

However, a workstation lighting realized in this way is very limited in terms of flexibility of light output. Changes, e.g. the arrangement of workplaces, so the lighting can not be adapted to the new situation without much effort. A similar problem exists not only when the desks are changed in their positions, but also when, for example, an additional workstation is to be added adjacent to a pre-existing, properly lit workstation. It then raises the problem that the existing light may not meet the requirements and an appropriate adjustment is required. So far, this meant that the existing luminaire had to be replaced by a new luminaire, which corresponds to the new arrangement and design of the workstations.

The present invention is therefore the task of specifying a novel way to be able to modify the illumination of workstations in a simple manner.

The object is achieved by a luminaire having the features of claim 1. Advantageous developments of the invention are the subject of the dependent claims.

The luminaire according to the invention is based on the fundamental idea that the already existing luminaire should continue to be used in its original configuration. However, in order to be able to illuminate the areas which adjoin the area to be illuminated by the already existing luminaire, it is provided to add an additional luminaire to the existing luminaire which only insignificantly impairs the appearance of the original luminaire. It should therefore be a very compact designed light, which can be arranged on the front side of the existing light in the ideal case. In this case, however, then there is the problem that due to the compact design of the additional light only little space is available and in particular can be delivered only over a very small area light. Since, despite all, the light emitted by this additional light must comply with the requirements for efficient workstation lighting in terms of glare and brightness, according to the invention a specially designed optical system is provided, which ensures that the light is effectively debladed despite light output via an extremely narrow light exit opening. For this purpose, the optical system comprises a reflector, which is arranged and designed with respect to the lighting means of the luminaire according to the invention such that only light beams reflected at this reflector are emitted via a light exit opening of the luminaire. Further, a reflector arranged in the light path grid system is present, which is effective transversely to the longitudinal direction of the light exit opening.

According to the invention, accordingly, a luminaire with a luminaire housing is proposed, which has an elongated light exit opening, luminous means extending in the longitudinal direction of the light exit opening are arranged in the luminaire housing, to which an optical system for influencing the light emitted via the light exit opening is assigned, and wherein the optical system a reflector arranged with respect to the lighting means and is formed so that only reflected at the reflector light beams are emitted via the light exit opening, and a reflector arranged in the light path raster system which is effective in the longitudinal direction of the light exit opening, wherein the bulbs are LEDs, which are parallel to the longitudinal direction of the light exit opening are arranged one behind the other, wherein the LEDs are arranged on a board, which is arranged to the plane of the light exit opening at an angle of about 30 ° to 60 ° such that the LEDs emit only light in a direction away from the light exit opening direction, and wherein the housing for Arrangement on the front side of another lamp housing is formed and the lamp is designed as a supplementary lamp.

It has been shown that light can be emitted with very high so-called Lumenpaketen in the desired, glare-free manner by this special optical system even with extremely compact dimensions of the lamp. Thus, this makes it possible to realize lights in which the light exit opening has a width at most in the range of 15 to 30 mm, despite all the light emitted via this extremely narrow light exit opening light can be effectively blinding. Thus, the luminaire according to the invention fulfills the requirement of being able to deliver high-quality light despite its compact dimensions.

Preferably, the grid system on slats, which are arranged transversely to the longitudinal direction of the light exit opening. The reflector itself is formed substantially elliptical, wherein the lighting means are preferably arranged approximately in a focal point of the ellipse. The lamps themselves may be, for example, LEDs, which are arranged parallel to the longitudinal direction of the light exit opening one behind the other.

Fig. 1

schematisch das der Erfindung zugrundeliegende Problem der Adaptierung einer Arbeitsplatzbeleuchtung;

Fig. 2

das Konzept des Verwendens einer Zusatzleuchte zum Anpassen der Beleuchtung;

Fig. 3

eine perspektivische Ansicht der verschiedenen Komponenten der erfindungsgemäßen Zusatzleuchte;

Fig. 4

die Ausgestaltung des bei der erfindungsgemäßen Leuchte zum Einsatz kommenden Rastersystems;

Fig. 5

die Wirkung der verschiedenen Komponenten des optischen Systems der erfindungsgemäßen Leuchte und

Fig. 6

die mit Hilfe der erfindungsgemäßen Leuchte erzielbare Lichtverteilung.

The invention will be explained in more detail with reference to the accompanying drawings. Show it:

Fig. 1

schematically the problem underlying the invention of adapting a workplace lighting;

Fig. 2

the concept of using an auxiliary light to adjust the lighting;

Fig. 3

a perspective view of the various components of the additional light according to the invention;

Fig. 4

the embodiment of the grid system used in the luminaire according to the invention;

Fig. 5

the effect of the various components of the optical system of the luminaire according to the invention and

Fig. 6

the achievable with the help of the lamp according to the invention light distribution.

First, based on FIG. 1 briefly again the problem underlying the invention will be explained. Shown is a desk 100 with two workstations 101 and 102, which are illuminated by a lamp 140 according to standards. The position and configuration of this lamp 140 is precisely matched to the arrangement of the workstations 101, 102 and the light emitted by the lamp 140 allows for efficient work. If the arrangement is to be expanded by a third workstation 103, then there is the problem that the lamp 140 is not designed for efficient illumination of this third workstation 103.

In order to illuminate this newly added workplace 103 is provided according to the present invention, as shown by FIG. 2 to attach to a front side of the existing lamp 140, a small additional light 150. In this way, the already existing lamp 140 continues be used and the additional light 150 is responsible for the lighting of the new workstation 103.

Of course, this additional light 150 should not seriously affect the appearance of the lighting arrangement. According to the presentation of FIG. 2 So should the additional lamp 150 compared to a classic lamp, as the lamp 140 corresponds to be extremely compact. Ideally, the dimension of the lamp 150 in the longitudinal direction of the additional lamp 140 should be below 100 mm. This in turn means that the in FIG. 2 recognizable Lichtabstrahlöffnung 151 is extremely narrow and has only a width of about 15 to 30 mm. Since at the same time, however, a relatively large amount of light, that is to say light of high lumen packages, has to be able to illuminate the workstation 103 satisfactorily, the light output must be influenced in a special way in order to be able to achieve a glare-free light emission which permits standard-compliant illumination. For this purpose, a specially designed optical system is used, which will be explained in more detail below.

The FIGS. 3 to 5 show different views of the lamp 150 or details thereof. In this case, the lamp initially has a box-shaped housing 10, which, as already mentioned, is designed to be extremely compact and should preferably extend in a direction transverse to the light emission opening 150 preferably over 100 mm. The width of the luminaire 150 or the length of the light exit opening 151 can be adapted to the width of the existing luminaire, so that there are no restrictions here. As already mentioned, however, the consequence is that the light exit opening 150 itself only has a width of between 15 to 30 mm, ideally of about 20 mm. In such proportions, a direct light output with high lumen packets at the same time glare is difficult to implement.

Therefore, according to the invention, an optical system is used whose components, in particular the sectional representation of FIG. 5 can be removed. In this case, the light of a LED board 5 which forms the luminous means of the luminaire 150 is to be influenced, on which parallel to the longitudinal direction of the Light exit opening 151 distributed a plurality of LEDs 6 are arranged. As can be seen, however, the circuit board 5 is not aligned such that the LED light directly leaves the lamp 150 via the light exit opening 151. Instead, the board 5 faces away from and inclined to the plane of the light exit opening 151, wherein the angle α (see FIG. 5 ) is in the range between 30 ° and 60 °, preferably at about 45 °.

The LEDs 6 thus initially emit light in a direction away from the light exit opening 151. In this case, the light beams strike a rear reflector 20, which is preferably approximately elliptical, the circuit board 5 with the LEDs 6 being arranged approximately at a focal point of the elliptical shape. Like the course of light rays in FIG. 5 shows, is ensured by this so-called. Secondary light system that only at the reflector 20 reflected rays leave the light exit opening 151. The distribution of the light in a plane perpendicular to the longitudinal axis of the light exit opening 151 can thus be influenced efficiently by the reflector 20, the shape of which is optimized in such a way that a light distribution curve is achieved, as shown in FIG FIG. 6 is shown. In this case, the reference symbol I shows the distribution in the so-called C0-C180 plane, whereas curve II shows the light distribution curve in the C90-C270 plane perpendicular thereto. For the light distribution according to the curve II, the shape of the reflector 20 is responsible, it being recognizable that the light is emitted on the one hand glare, so no significant amounts of light are emitted at an angle above 45 ° with respect to the vertical. At the same time, however, the light distribution is slightly asymmetrical, that is, the light is increasingly emitted to the right in the case shown, in order to correspond to the situation of FIG. 1 actually be able to illuminate the diagonally below the lamp 150 arranged workplace 103.

In a direction perpendicular thereto, however, a symmetrical light output according to the curve I is desired, which is obtained by the use of a grid system 30, which is arranged upstream in the light path in the reflector 20. Ideally, this consists of several V-shaped blades 31 (see FIG. 4 ) existing raster system 30 is arranged directly on the circuit board 5, wherein the fins 31 taper, starting from the circuit board 5. It is ideally between each two LEDs 6 of Illuminant a blade 31 is arranged. As a result, the light emitted in the C0-C180 plane can also be emitted without being dazzled.

The interaction of the various optical components ultimately makes it possible, even with very high lumen packages, that is to say a large amount of emitted light via the light exit opening 151, to glare this in the desired manner despite everything. The optics, however, despite all relatively simple design and can be realized inexpensively, so that despite all a compact, simply constructed light can be created, which despite all emits light in high quality, such that it is suitable for efficient illumination of jobs.

As already mentioned, however, corresponding optical systems can not only be used in the case of FIG. 1 described application case are used. Instead, the concept according to the invention with regard to the highly efficient light emission can also be used in other cases, for example in reading lights in the hospital sector or the like.

Claims (4)

1. A luminaire (150) with a luminaire housing (10), which has an elongated light exit opening (151), wherein in the luminaire housing (10) lighting means are arranged extending in the longitudinal direction of the light exit opening (151), to which lighting means an optical system for influencing the light emitted via the light exit opening (151) is assigned,
   and wherein the optical system comprises:

   • a reflector (20), which is arranged and designed with regard to the lighting means in such a manner that only light beams reflected on the reflector (20) are emitted via the light exit opening (151), as well as

   • a grid system (30) arranged in the light path upstream of the reflector (20), which grid system is effective in the longitudinal direction of the light exit opening (151),

   wherein the lighting means are LEDs (6), which are arranged one behind another parallel to the longitudinal direction of the light exit opening (151), and wherein the LEDs (6) are arranged on a board (5), which is arranged at an angle of approximately 30° to 60° to the plane of the light exit opening (151) in such a manner that the LEDs (6) emit light in a direction facing away from the light exit opening (151), and
   wherein the housing (10) is designed for arrangement on the end face of another luminaire housing and the luminaire (150) is designed as an additional luminaire.
2. A luminaire according to Claim 1,
   characterized in
   that the grid system (30) has lamellae (30), which are arranged transversely to the longitudinal direction of the light exit opening (151).
3. A luminaire according to Claim 1 or 2,
   characterized in
   that the reflector (20) is designed substantially elliptically, wherein the lighting means are preferably arranged approximately in a focal point of said ellipse.
4. A luminaire according to any one of the preceding claims,
   characterized in
   that the light exit opening (151) has a width of approximately 15 mm to 30 mm.

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