EP1353117A2 - Lighting device - Google Patents

Abstract

The light fitting has a tubular gas discharge lamp (1), an adjacent concave reflector (2) and a partially-reflective light diffuser (3) positioned in front of the reflector, cooperating with the reflector for providing divergent light chambers (4) on either side of the lamp. The ratio between the width (a) of the light output surface of each divergent light chamber to the height (b) of its light input surface is at least 4:1.

Description

The present invention relates to a luminaire according to the preamble of Claim 1.

A luminaire of this type, as described for example in DE 44 43 916 A1 is shown in Fig. 14. It is below an elongated gas discharge lamp 21 a consisting of side reflectors and cross blades raster reflector 26th arranged, with the aid of which most of the light emitted by the lamp 21 light directed and glare-free downwards radiated. The use of such Rasterreflektors 26 is for example in lights in offices with multiple Computer workstations are advantageous because the light emitted down to a is cross-faded to some degree and therefore no reflections on the screens can cause.

The lamp shown in Fig. 14 further comprises a concave curved Outer reflector 22 on which the side of the lamp 21 and upwards radiated light falls. In this way, the lamp 21 and the raster reflector 26 surrounding area additionally brightens, which allows on the one hand, in a simple way to know whether the lamp is actually turned on or not, but on the other hand is perceived by a viewer as much more pleasant than the light a pure grid lamp in which the entire light is emitted only downwards so that the ceiling area itself appears dark.

In such lamps, it is usually desirable that the lamp surrounding Area appears in a uniform brightness density. This problem will for example, also in DE 43 36 923 A1. As a rule, therefore, the Outer reflector of such a lamp a certain and previously calculated exactly Curvature on the side of the lamp emitted light in such a Way that the outer reflector appears uniformly bright. This has however then usually the result that the outer reflector due to this predetermined Curvature has a relatively high height and small width, so that the light overall is very high. If, however, the outer reflector 22 designed flatter This would mean that the luminance in lamp 21 would be obvious Regions of the outer reflector 22 is higher than at the edge of the reflector. At the in Fig. 14 shows a uniform distribution of the brightness density additionally supported by the fact that below the outer reflector 22 a translucent (opal) disc 23 is arranged. Overall, however, this also points Light a relatively high height.

It is an object of the present invention to provide a luminaire, with respect to their shape goes new ways and offers more design possibilities. Furthermore, the new luminaire has a significantly lower height than the known lights.

This object is achieved by a luminaire which has the features of claim 1 has dissolved.

The luminaire according to the invention has a tubular gas discharge lamp, at least one - viewed from the area to be illuminated - next to the lamp arranged concave curved reflector and at least one - also of seen from the area to be illuminated - next to the lamp but in front of the reflector arranged at least teillichtdurchlässigen diffuser. The diffuser and the reflector limit next to the lamp at least one light entrance surface and run on her from the lamp end together so that they have at least one light chamber include, according to the invention, the largest distance between the reflector and the diffuser is greater than the height of the light entry surface.

The inventive design of the reflector creates a luminaire, which has a novel and interesting shape. In addition, the special shape of the light chambers also possibilities to achieve special, visually appealing lighting effects, as explained in more detail later becomes.

Preferably, the ratio of the width of one of the reflector and the Diffuser formed light chamber to the largest distance between the reflector and the diffuser at least 4: 1. Particularly preferred is the ratio of the width a light chamber to the largest distance between the reflector and the diffuser between 4: 1 and 5: 1. This measure has the consequence that the lamp as a whole can be made much flatter and also the possibility exists, the Lights give a completely new look.

To achieve a uniform luminance over the reflector cross section can several additional means may be provided on the luminaire. Preferably, e.g. the light entry surfaces for the light chamber or light chambers also by Diffusers formed. Another possibility is that the light entry surfaces are formed such that a higher proportion of the lamp in a light chamber emitted light is directed to more distant areas of the reflector. To For this purpose, for example, the aforementioned and the light entry surfaces forming diffusers have a different light transmission, or it it is possible in the light entry surfaces optical elements - for example Prism structures or the like - to attach, which is the light in the desired way to steer the reflector. Preferably, the surface of the Reflector also diffuse reflective, but it can also be designed such that areas further away from the lamp have a higher reflectance than the lamp obvious areas, which also equalize the Luminance supported. Another measure may be that also the arranged in front of the reflector diffuser one from the distance to the lamp having dependent light transmission.

Around the light emitted by the lamp downwards for effective illumination to use, a light distribution element, e.g. one be arranged from side reflectors and cross blades existing grid. Also other optical elements would be conceivable that would give a more interesting look to the cause entire lamp, such as a teillichtdurchlässiges perforated plate or like.

Developments of the lamp may also consist in that the side of the Lamp arranged reflector itself is teillichtdurchlässig. It then exists Possibility to use additional light sources behind this partial translucent reflector to be used to achieve special lighting effects can. On the other hand, in this case, a lying above the light Ceiling area to be brightened.

If the reflector is partially transparent, then another development can also be found therein exist behind the reflector to arrange another reflector, so that behind the Light chambers each have a further light chamber is formed. It then exists Possibility of additional light sources within these further light chambers to install, which may be controllable for example in their color and brightness. This may be, for example, controllable light emitting diodes (LED's) act. This can again a variety of different lighting effects be achieved.

Finally, to achieve another new lighting effect as well be provided that arranged within the light entry surfaces optical elements which are a change in color of the light which has become the reflector effect, so that the area surrounding the lamp in a slightly different color appears.

The luminaire according to the invention can in several different types of lights Find use.

Fig. 1

ein Ausführungsbeispiel einer Deckeneinbauleuchte, die zwar nicht Gegenstand der Ansprüche ist, jedoch Maßnahmen und Elemente aufweist, die auch bei der erfindungsgemäßen Leuchte zum Einsatz kommen können;

Fig. 2-10

weitere Leuchten, die ebenfalls Merkmale zur Weiterbildung der erfindunsgemäßen Leuchte beinhalten, selbst allerdings nicht Gegenstand der Ansprüche sind;

Fig. 11

ein erstes Ausführungsbeispiel einer erfindungsgemäßen Leuchte;

Fig. 12

ein zweites Ausführungsbeispiel einer erfindungsgemäßen Leuchte;

Fig. 13

eine weitere Leuchte, die nicht unter den Umfang der Ansprüche fällt; und

Fig. 14

eine aus dem Stand der Technik bekannte Leuchte.

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

Fig. 1

an embodiment of a recessed ceiling light, which is not the subject of the claims, but has measures and elements that can also be used in the luminaire according to the invention;

Fig. 2-10

further lights, which also include features for further development of the erfindunsgemäßen lamp, even though not the subject of the claims;

Fig. 11

a first embodiment of a lamp according to the invention;

Fig. 12

A second embodiment of a lamp according to the invention;

Fig. 13

another lamp that does not fall under the scope of the claims; and

Fig. 14

a known from the prior art lamp.

In the ceiling luminaire shown in Fig. 1, the individual components of the Luminaire disposed within a box-shaped container 8, the mounting the lamp is sunk in the ceiling of the room to be illuminated. As a light source serves a rod-shaped gas discharge lamp 1, under the one from side reflectors and Querlamellen existing grid 6 is arranged, over which a majority of the of Lamp 1 emitted light is emitted downwards. The concrete Forms of this grid 6 are chosen so that the downwardly radiated light until is cross-trimmed to a certain extent, so that the lamp in particular for Lighting of rooms with VDU workstations is suitable. Alternatively to that Grid 6 may also be a perforated plate, which e.g. is deposited with slides, or a other optical element - for example a diffuser or a prism structure - be used.

The rod-shaped gas discharge lamp 1 is further characterized by a concave curved Reflector 2 spans, the side wings substantially next to the lamp. 1 are arranged. Before this reflector 2 and thus also laterally from the lamp. 1 Furthermore, a diffuser 3 is arranged, which together with the reflector 2 two Light chambers 4 includes by the diffuser 3 and the reflector 2 both at their converging from the lamp 1 end. Here are the Light entry surfaces for these light chambers 4 from the upper edge of the grid 6 and limited to the reflector 2. As arranged in front of the reflector 2 diffuser 3 until extends to the side wall of the grid 6, it is avoided that the lamp 1 side can be viewed directly and thus dazzling effects arise.

The width (a) of the light chambers 4 is at least four times as large as the height (b) of Light entry surfaces, ie the distance between the upper edge of the grid 6 and the Reflector 2, so that the light overall designed very flat and visually appealing can be. Preferably, the size ratio is between 4: 1 and 5: 1.

To achieve a uniform luminance over the entire width of the reflector 2 is further provided in the lamp shown in Fig. 1 that the two Light entry surfaces are formed by diffusers 5, which on the reflector. 2 Distribute thrown light more evenly. Together with the front of the reflector 2 Arranged diffuser 3 is thus effected that the lamp 1 and the grid. 6 surrounding area of the luminaire appears evenly bright, despite the low height the light. The diffusers 5 are preferably together with the diffuser 3 integrally formed. Furthermore, the reflector 2 can be diffuse on its inside be reflective.

In the illustrated example, the reflector 2 is further formed teillichtdurchlässig, wherein behind this reflector 2 two further rod-shaped lamps 7 are arranged. These are to achieve the desired lighting effect - effective radiation a majority of the light emitted by the lamp 1 light on the grid 6 down and uniform brightening of the area surrounding the lamp 1 - initially not necessary, but with their help additional and new Lighting effects are met. The two lights 7, for example be set independently of the lamp 1 to a certain brightness, so that This gives the possibility of the arranged next to the lamp 1 area regardless of the brightness of the lamp 1 lighten.

The luminaire shown in FIG. 2 is a recessed luminaire for a Grid system. The lamp is in two laterally arranged by her and suspended in the ceiling rails 9 mounted. In their other structure is this Luminaire of the recessed ceiling light shown in Fig. 1 very similar, but in In this example, the reflector 2 is not teillichtdurchlässig. The two Light entry surfaces for the light chambers 4 are in turn by two diffusers. 5 formed, however, in addition to the height of the diffuser 5 have changing light transmission. In this case, light rays S1, the of the lamp 1 are emitted towards nearby areas of the reflector 2, weakened relatively strong, while on lying away from the lamp 1 areas the reflector 2 directed light beams S2 more or less undamped by the Diffuser 5 pass. This has a further compensation of the reflector on the second achieved luminance result.

The luminaire shown in FIG. 3 is likewise an inlay luminaire, in this case in two suspended ceiling elements 10, the side of the lamp are arranged, is hung. In this case, the two will Light entry surfaces for the light chambers 4 formed by a prism structure 11, which causes the light beams S3 emitted from the lamp 1 to pass by this prism structure 11 on the lamp 1 more remote areas of the Reflectors 2 are steered. This measure also serves to ensure a more uniform Luminance over the reflector cross section to achieve.

The light shown in Fig. 4 is partially in a suspended ceiling element 10th sunk, however, the turn is trained partially translucent reflector 2 of the underside of this ceiling element 10 is arranged at a distance. In contrast to that in Fig. 1 illustrated embodiment, however, are now behind the reflector. 2 No further light sources arranged. The partial translucent reflector 2 is in This example used with a part of the lamp 1 in the Lichtkammern 4 steered light also above the light lying area of the Ceiling element 10 in addition to lighten a little, which is another optical has an appealing lighting effect.

An additional brightening of the ceiling area above the luminaire becomes achieved in the embodiments shown in Figs. 5 and 6, in which it is a ceiling-mounted luminaire (Fig. 5) and a pendant luminaire (Fig. 6), which correspond in their further construction of the light shown in Fig. 4. Next the already explained measures for achieving a uniform luminance over However, the reflector cross section could still be provided that the reflector. 2 is formed such that more distant from the lamp 1 areas a higher Have reflectivity as the lamp 1 near areas. Another Measure could also be that of the lamp 1 more distant Regions of the diffuser 3 have a higher light transmittance than the lamp. 1 nearby areas.

The luminaire shown in FIG. 7 is likewise designed as a ceiling-mounted luminaire, now, however, has a different reflector shape. The reflector 2 is in contrast to the previous embodiments no longer integrally formed, but consists of two concave curves extending laterally to the ceiling Wings. The ratio according to the invention between the width (a) of Light chambers 4 and the height (b) of the light entry surfaces is met here as well.

Also, the two side wings of the diffuser 3 arranged in front of the reflector 2 extend to the ceiling, so that overall seen a continuous transition from the luminaire to the ceiling. Again, between the top edge of the arranged under the lamp 1 raster reflector 6 and the reflector. 2 Light entry surfaces for the light chambers 4 formed, in turn, by two Diffusers 5 are formed. As in the first embodiment, the reflector 2 turn trained teillichtdurchlässig and there are to achieve more Lighting effects above this reflector 2 two more lamps 7 are arranged.

In FIGS. 8 and 9, the luminaire shown in FIG. 7 is again in the form of a recessed luminaire designed for a visible rail system or for a suspended ceiling system. at the example shown in Fig. 9, the two diffusers 5, however additionally provided with color filters, so that the directed into the light chambers 4 Light has a different color composition than that on the raster reflector 6 light emitted downwards. This has the consequence that the lamp 1 surrounding Area appears in a slightly different color, so that by choosing a suitable Color filters certain moods can be generated. For example, a be created very pleasant atmosphere by the directed on the reflector 2 Light with the help of an example slightly yellowish or orange colored color filter is given a slightly warmer shade. In contrast, bluish light is called felt rather cold, which would offer, for example, in warmer areas. However, since the light emitted via the grid 6 downward in its color Composition and also in its intensity is not changed, will remain enables effective illumination of the area below the luminaire.

Fig. 10 shows a further embodiment in which the previously illustrated lamp with the laterally extending side wings designed as a pendant light is, in turn, the reflector 2 is formed partially permeable to a To achieve brightening of the ceiling area.

The luminaire according to the invention shown in FIG. 11 is in turn to a ceiling light, the reflector 2, however, now such a shape has the greatest distance (c) between the reflector 2 and the diffuser 3 is greater than the height (b) of the light entry surfaces. In this case is preferably not only the ratio between the width (a) of the light chambers 4 to Height (b) of the light entry surfaces but even the ratio of the width (a) of Light chambers 4 at this maximum distance (c) at least 4: 1, so that a flat Construction is ensured. Again, the size ratio is preferably between 4: 1 and 5: 1.

Finally, FIGS. 12 and 13 show a development of the previously described Luminaires, which is particularly suitable for recessed ceiling lights, the shape of the in Fig. 12 illustrated lamp of the lamp shape according to the invention in Fig. 11 and the shape of the lamp in Fig. 13 corresponds to the luminaire shape of Figures 1 to 6. The Further development is that behind the partillustrated permeable reflector 2, a further concave reflector 12 is arranged, which together with the reflector 2 two more light chambers 13 forms, each behind the original Light chambers 4 are arranged. In these additional light chambers 13 are more Light sources arranged, here in the form of printed circuit boards with several in a row arranged LED 's 14. These LED' s 14 can with respect to their color and Brightness controllable, which achieves a variety of different lighting effects can be. Of course, other controllable light sources for Use come. In addition, the formation of the further light chambers 13 by the additional reflector 12 also in the other types of luminaires and Luminaire shapes done.

The luminaire according to the invention can thus be used in a variety of different ways Be manifestations designed; e.g. as recessed, surface-mounted and Pendant light, but also as a floor lamp. In the context of these embodiments the different reflectors, diffusers, lamps or illuminant arrangements, color filters, screens, perforated plates and prismatic structures be combined in any way. Since the height of the light chambers 4 is very low is, there is also the possibility, overall very flat and visually appealing To create lights and give them new shapes with an appealing design. However, despite the very shallow Be achieved design that over the entire width of the reflector 2 in the substantially uniform luminance is achieved, so that very appealing Lighting effects can be achieved.

Claims (17)

Luminaire with a tubular gas discharge lamp (1), at least one - viewed from the area to be illuminated - concave curved reflector (2) arranged next to the lamp (1) and at least one - next to the lamp (also viewed from the area to be illuminated) 1) but arranged in front of the reflector (2) at least part-light permeable diffuser (3),
wherein the diffuser (3) and the reflector (2) next to the lamp (1) delimit at least one light entry surface and converge at their end remote from the lamp (1) such that they include at least one light chamber (4),
characterized in that the largest distance (c) between the reflector (2) and the diffuser (3) is greater than the height (b) of the light entry surface. Luminaire according to claim 1,
characterized in that the ratio of the width (a) of a light chamber (4) to the largest distance (c) between the reflector (2) and the diffuser (3) is at least 4: 1. Luminaire according to claim 2,
characterized in that the ratio of the width (a) of a light chamber (4) to the largest distance (c) between the reflector (2) and the diffuser (3) is between 4: 1 and 5: 1. Luminaire according to one of the preceding claims,
characterized in that additional means for achieving a uniform luminance over the reflector cross-section are provided on the lamp. Luminaire according to claim 4,
characterized in that the at least one light entry surface is also a diffuser (5). Luminaire according to claim 4,
characterized in that the at least one light entry surface is formed by an optical element (5, 11) formed such that a higher portion of the light incident from the lamp (1) into a light chamber (4) reaches more distant portions of the reflector (2) is steered. Luminaire according to claim 4,
characterized in that of the lamp (1) remote areas of the diffuser (3) have a higher light transmission than near the lamp (1) lying areas. Luminaire according to claim 4,
characterized in that of the lamp (1) more remote areas of the reflector (2) have a higher reflectance than near the lamp (1) lying areas. Luminaire according to one of the preceding claims,
characterized in that - seen from the area to be illuminated - in front of the lamp (1), a light distributor element (6) is arranged. Luminaire according to claim 9,
characterized in that the light distributor element is a grid (6) consisting of side reflectors and transverse blades. Luminaire according to claim 9,
characterized in that below the lamp (1) a teillichtdurchlässiges perforated plate is arranged. Luminaire according to one of the preceding claims,
characterized in that the reflector (2) is teillichtdurchlässig. Luminaire according to claim 12,
characterized in that behind the teillichtdurchlässigen reflector (2) at least one further lamp (7) is arranged. Luminaire according to claim 12,
characterized in that a further concavely curved reflector (12) is arranged behind the partial translucent reflector (2) and forms, together with the partially translucent reflector (2), at least one further light chamber (13) arranged behind the light chamber (s) (4), in which a further light source (14) is arranged. Luminaire according to claim 14,
characterized in that the additional light source is a plurality of light emitting diodes (14). Luminaire according to claim 15,
characterized in that the light emitting diodes (14) are controllable in terms of their brightness and color. Luminaire according to one of the preceding claims,
characterized in that the at least one light entry surface contains a color filter (5).

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