EP1628070A2 - Illumination device - Google Patents

Abstract

The lighting device has a housing (1) containing a light source (3). The reflector (4, 5) is made in at least two parts: a primary reflector (4) and a secondary reflector (5). The two reflectors are arranged with the light source between them. The light source has a louver (R), which carries the primary reflector, so that this reflector can be more easily changed.

Description

The invention relates to a lighting device, in particular ceiling recessed or suspended luminaire, with a housing and a lamp arranged therein, and with a reflector for the lamp, which reflector is at least two parts with primary reflector and secondary reflector, with both reflectors with respect to the between arranged lamps are opposite.

Lighting devices with reflectors for the light source are widely known in practice and are otherwise described in DE 196 09 262 C2. Here already comes a special reflector, namely a rotationally symmetric involute reflector for wide-beam light distribution used. Such lighting devices have basically proven, but are capable of improvement when it comes to special lighting requirements.

In particular, in the presentation of goods on retail space in stores, for example, it is important to illuminate the usually vertically arranged shelves or stacks of goods at least as well as the transition therebetween. Only in this way can a uniform light flood be achieved without setting special accents or neglecting certain areas of space or goods. These requirements have not always been accurately implemented in the past, because the emanating from the bulb white light radiation, which is regularly modeled on daylight, often preferred lighting directly located under the lamp space, whereas the actual goods display areas or shelves have not experienced adequate lighting ,

The generic state of the art according to the US-PS 3 009 054 or according to the FR 604 343 already works with two-part reflectors of primary reflector and secondary reflector. However, the known lighting devices require considerable design effort, which concerns in particular the mounting and execution of the individual reflectors. In fact, at this point mostly complicated cross-sectional shapes and special fastening measures can be found. This also applies to the further generic state of the art according to DE 15 97 992 A. - Here the invention aims to provide a total remedy.

The invention is based on the technical problem of further developing a lighting device of the design described above so that in particular lateral areas with goods located there experience better illumination, and this should be achieved with a simplified construction.

To solve this technical problem, a generic lighting device in the context of the invention is characterized in that a blind raster for the lamp carries the primary reflector. This glare grid is usually found in such lighting devices mandatory, below the light source to cover the free view of the bulb or to avoid dazzling effects emanating from it.

In most cases, the relevant screen grid is equipped with a plurality of lamellae, which are arranged perpendicular to the longitudinal extent compared to the regular rod-shaped light source. Since the light leaves such a rod-shaped light source mostly in the radial direction, the slats find themselves in parallel radial planes and thus hinder the light emission in the radial direction practically not or only insignificantly. On the other hand In contrast to these radial planes, obliquely emitted light and the resulting dazzling effect are effectively prevented.

In the context of the invention, such a blind grid with its slats now serves to support the primary reflector. In this context, the primary reflector may be designed to be interchangeable and is advantageously equipped with respective transverse slots and pushed onto the blind grid or its slats and held on the blind grid. That is, the frictional forces built up between said transverse slots and the vanes are sufficient not only to properly hold the primary reflector in the desired position, but also to do so permanently. At the same time, such a design allows the replacement of the primary reflector and the retrofitting of lighting devices with such a primary reflector, which are previously equipped only with a reflector.

This originally existing reflector, in conjunction with the retrofitted primary reflector, now functions as a secondary reflector. In this case, the two reflectors preferably surround the illuminant except for lateral free areas, wherein the primary reflector additionally ensures that the illuminant is covered in a plan view of the illumination device as a whole. In conjunction with the lamellae of the blend screen, the light bulb is thus completely covered, accordingly unwanted glare can not occur. Incidentally, the reflectors are usually equipped with mutually facing convex surfaces.

Through these measures, light emanating from the illuminant passes, unchanged, directly into the room to be illuminated, but only through the mostly two lateral free areas in an oblique direction. The direct emission is thus largely obtuse, the two leaving the illuminant and passing through the lateral free areas beam cone include an angle between about 90 ° and 150 ° to 160 °, with preferably an obtuse angle of 120 ° to 130 ° is observed. Of course this is not mandatory.

On the other hand, all the remaining radiation from the light source is emitted either from the primary reflector or from the secondary reflector or from both into the room. As a result, the illumination of the side areas is significantly better and more deliberate compared to the floor directly under the illumination device.

In this context, the lighting device is placed regularly in the middle of the longitudinal extent over a corridor between two shelves, so that the emphasis of the invention on the lateral radiation ensures a particularly effective illumination of the shelves and the goods placed there. This applies both in the event that the described lighting device is designed as a recessed ceiling light as well as when a pendant light is preferred. Taking into account the above-mentioned preferred maximum skew angle for the direct radiation of about 150 ° to 160 °, the optimum height position of the illumination device described can be found with the help of simple trigonometric calculations to still depend on the side shelves proper illumination and the particularly far to reach the top placed goods.

As a result, the lighting device described convinces by a particularly balanced lighting of the lateral edge areas such as the floor, which positively influence the buying behavior.

For this purpose, the primary reflector and the secondary reflector are largely mirror-symmetrical in comparison to a longitudinal plane of symmetry of the housing of the illumination device. It likes the bulb located on the longitudinal plane of symmetry. This is preferably a neon-based fluorescent tube, for example, or else an LED strip which carries a multiplicity of LEDs (Light Emitting Diodes) in longitudinal extension. For this case, one will use so-called white light LEDs, and preferably those which emulate a black body with a temperature of about 4000 Kelvin, so produce a particularly warm white light. This can be achieved by mixing individual colored LEDs in the basic colors green, blue and red.

It has proven useful to form the primary reflector for the most part in a triangular shape with reflector legs that intersect in a triangular tip closest to the illuminant. Consequently, one can also speak of a V-shape of the primary reflector with the two reflector legs and accordingly a V-tip.

In addition, the triangular tip or V-tip may have a flattening adapted to the transverse extent of the luminous means. Here, the invention takes into account the fact that the light source or at this point mostly used arc tube is designed in cross-section circular with finite extent. In this case, the flattening may correspond approximately to the radius of this arc tube, so that mainly at an acute angle emitted by the light source downward light thrown directly onto the reflector legs of the primary reflector and exits from there under increased skew angle from the housing.

The reflector legs of the primary reflector can extend in vertical direction to below the side edge of the secondary reflector, by a predetermined amount. In this way, a lateral Lichtaustrittshorizontalspalt is defined, ie a gap that allows horizontal light emission. In addition, like the reflector legs of the primary reflector in the horizontal direction and foot side have a predetermined distance from the side edge of the secondary reflector, so that in each case a lateral Lichtaustrittsvertikalspalt is defined. This additionally favors a vertical light emission.

But it is also possible to work only with one or two on both sides of the primary reflector defined Lichtaustrittsvertikalspalten or only Lichtaustrittshorizontalspalten. Either way, two light beams exit directly from the described illumination device, which essentially enclose an obtuse angle and consequently illuminate mainly lateral vertical areas and the shelves provided there for the most part.

The secondary reflector may have a cross-sectionally arcuate, double-arched, semicircular, parabolic or comparable design. In addition, one or more openings are conceivable to realize a light emission not only down, but also up out of the housing, so that the ceiling undergoes illumination.

Since it is ultimately possible with the aid of the primary reflector to define the two mainly radiated beam cones and their angle to one another, the invention also proposes to make the primary reflector interchangeable and variable. As a result, different requirements can be taken into account. For in the simplest case, the primary reflector is designed as a cross-sectionally substantially V-shaped and optionally coated sheet, which is held, for example, on end plates of the housing, so that the exchange is easy and quick. Likewise, the primary reflector can also be attached to an optional blind grid, which further simplifies the exchange.

Fig. 1a und 1b

die erfindungsgemäße Beleuchtungseinrichtung perspektivisch und im schematischen Querschnitt in einer ersten Variante und

Fig. 2a und 2b

die Beleuchtungseinrichtung perspektivisch und im schematischen Schnitt in einer zweiten Ausgestaltung.

In the following the invention will be explained in more detail with reference to a drawing showing only one exemplary embodiment; show it:

Fig. 1a and 1b

the illumination device according to the invention in perspective and in schematic cross-section in a first variant and

Fig. 2a and 2b

the illumination device in perspective and in schematic section in a second embodiment.

In the figures, a lighting device is shown, which is designed in the context of the example and not restrictive as recessed ceiling light. For this purpose, the lighting device has a housing 1, which is equipped with optional head-side spring legs 2, which engage in not shown grooves in a ceiling construction. In the housing 1, a lighting means 3 is arranged, which act in neon-based fluorescent tube or neon tube. Alternatively, a light bar with LEDs could be used.

A reflector 4, 5 ensures that the (white) light radiated radially in radial cross section by the rod-shaped luminous means 3 experiences a desired deflection. For this purpose, the reflector 4, 5 is constructed in two parts with primary reflector 4 and secondary reflector 5. Both reflectors 4, 5 face each other with respect to the largely arranged therebetween bulbs 3. The primary reflector 4 is designed to be interchangeable and is in the context of the variant of FIGS. 1 a, 1 b pushed and held with respective transverse slots on a blind raster R. In fact, individual lamellae of this blend screen R dip into the respective transverse slots, the frictional forces built up thereby keeping the primary reflector 4 in the desired position.

This is ultimately determined by the depth of the transverse slots, which determines how far the primary reflector 4 can be slid onto the blind raster R or the respective slats (cf., FIG. 1b). By this measure, a measure M is defined, which expresses how far associated reflector legs 4a, 4b of the primary reflector 4 in the vertical direction V extend to a side edge of the secondary reflector 5, as will be explained in detail below. In any case, this embodiment ensures a problem-free retrofitting of existing lighting devices with only secondary reflector 5 by attaching the additional primary reflector. 4

It can be seen that the primary reflector 4 covers the illuminant 3 in plan view of the illumination device (arrow A in FIG. 1b), so that the fluorescent tube 3 realized at this point can not be seen from below when the illumination device is installed in the ceiling , The same applies if the lighting device is designed as a pendant lamp. Likewise, when the lighting device is used as wall lighting use. Both reflectors 4, 5 are equipped with mutually facing convex surfaces F.

The two reflectors 4, 5 enclose the illuminant 3 almost completely taking into account lateral free areas 6. Through these free areas 6, the light emanating from the light source 3 can leave the housing 1 directly. As a result, two directly emitting light cone 7, 8 are defined in each case, which are indicated by solid lines in Figs. 1 b and 2b. In the context of the exemplary embodiment, these two light cones 7, 8 form an obtuse or almost right angle α within which no direct radiation is emitted. The area swept by the two light cones 7, 8 (angle β) is approximately 160 °. Consequently, the two light cones 7, 8 include opening angles γ of approximately 35 ° to 40 °, which is not mandatory, however.

The illumination device is generally arranged in comparison with merely indicated bilateral shelves 9, 10 above a corridor illuminated therewith such that the respective shelves 9, 10 are illuminated from the floor to the head mainly by means of the directly emitted light from the respective light cones 7, 8 become. In contrast, the floor area experiences only a practically indirect illumination by radiation reflected from the primary reflector 4 to the secondary reflector 5 almost vertically leaves the secondary reflector 5 and here provides the desired lighting conditions (see the illustration in Fig. 2b). Due to this multiple reflection, however, a slightly smaller light intensity compared to the light cones 7, 8 is to be expected here, which, however, is virtually impossible because of the smaller area compared to the laterally illuminated surface of the shelves 9 and 10, which must be illuminated Weight drops.

Overall, a uniform and desired lighting impression with an emphasis on the two-sided shelves 9, 10. The floor between the two shelves 9, 10 is additionally irradiated by light, which is reflected by in the two-sided shelves 9, 10 goods. It is also possible that the ground only undergoes radiation through this and not additionally by the multiple reflection outlined.

It can be seen that the primary reflector 4 and the secondary reflector 5 are mirror-symmetrical in comparison to a longitudinal plane of symmetry S of the housing 1 and consequently of the illumination device as a whole. On this Längssymmetrieebene S is also the bulb 3.

The primary reflector 4 is mostly V-shaped or triangular with reflector legs 4a, 4b executed, which intersect in a triangle tip or V-tip 11, which comes closest to the light source 3. It can do this Triangle tip or V-tip 11 also be executed flattened, as can be seen in Fig. 2b and here have a flat 12. The flattening 12 is arranged horizontally in the embodiment and has a length which substantially corresponds to the radius of the luminous means 3 in cross section, but this is not mandatory.

The reflector legs 4a, 4b of the primary reflector 4 extend in the vertical direction V by a predetermined amount M to below the side edge of the secondary reflector 5, so that a lateral light exit horizontal gap in the form of a vertical component 6a of the lateral free area 6 is present. In addition, a light exit vertical gap 6b may also be realized as a horizontal component of the lateral free area 6 (cf., FIG. 1b). This is explained by the fact that the reflector legs 4a, 4b additionally in the horizontal direction H foot side have a predetermined distance B to the side edge of the secondary reflector 5. In principle, it is also possible to work only with a light exit vertical gap 6b corresponding to the variant according to FIG. 2b so that the lateral free area 6 does not have a light exit horizontal gap 6a at this point.

In the context of the exemplary embodiment according to FIG. 1 b, the secondary reflector 5 has an approximately semicircular shape in cross-section, with the illuminant 3 largely being arranged in the center of this semicircle or its convex surfaces F. In addition, a double-arcuate embodiment according to FIG. 2b may also be realized. Other designs, such as purely arched or parabolic are conceivable and are encompassed by the spirit of the invention.

Because the luminous means 3 is arranged predominantly close to the center in comparison to the secondary reflector 5, the reflected light is radiated mainly vertically out of the housing 1, while the non-reflected directly emerging light - as described - largely obliquely leaves the housing 1.

The luminous means 3 is a fluorescent tube 3, although of course it is also possible to realize a light strip with a multiplicity of LEDs, which can advantageously be arranged on the longitudinal symmetry plane S and / or on both sides thereof. The convex surfaces F of the primary reflector 4 are indicated in accordance with the indicated beam guidance according to FIG. 2 b in such a way that the light impinging on them mainly strikes the secondary reflector 5. This is achieved by placing the center of the luminous means above the V-tip 11 or in the middle of the flattening 12 and the reflector legs 4a, 4b increasingly open in vertical projection of the luminous means 3 onto the primary reflector 4.

Claims (10)

Lighting device, in particular recessed ceiling light, with a housing (1) and a lamp arranged therein (3), and with a reflector (4, 5) for the lamp (3), wherein the reflector (4, 5) at least two parts with primary reflector (4) and secondary reflector (5) is constructed, and wherein both reflectors (4, 5) with respect to the interposed bulbs (3) are opposite, characterized in that a blend grid (R) for the light source (3) the primary reflector ( 4) Lighting device according to claim 1, characterized in that the primary reflector (4) is designed to be interchangeable and is pushed with respective transverse slots on the blind raster (R) and held thereon. Lighting device according to claim 1 or 2, characterized in that the primary reflector (4) covers the lighting means (3) in plan view of the housing (1). Lighting device according to one of claims 1 to 3, characterized in that the primary reflector (4) and the secondary reflector (5) enclose the lighting means (3) except for lateral free areas (6). Lighting device according to one of claims 1 to 4, characterized in that the primary reflector (4) is largely V-shaped with reflector legs (4a, 4b), which intersect in a the illuminant (3) closest V-tip (11). Lighting device according to one of claims 1 to 5, characterized in that the reflector legs (4a, 4b) of the primary reflector (4) in the vertical direction (V) to a predetermined amount (M) below the side edge of the secondary reflector (5), so that in each case a lateral light exit horizontal gap (6a) is defined. Lighting device according to one of claims 1 to 6, characterized in that the reflector legs (4a, 4b) of the primary reflector (4) in the horizontal direction (H) foot side a predetermined distance (B) to the side edge of the secondary reflector (5) defining each Lichtaustrittsvertikalspalten ( 6b). Lighting device according to one of claims 1 to 7, characterized in that the secondary reflector (5) has a cross-sectionally arcuate, double-arched, semicircular, parabolic or comparable shape. Lighting device according to one of claims 1 to 8, characterized in that the lighting means (3) is arranged predominantly close to the center in comparison to the secondary reflector (5). Lighting device according to one of claims 1 to 9, characterized in that the lighting means (3) is designed as a rod-shaped fluorescent tube on, for example, neon-based and / or LED strip.

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