Lighting device

Abstract

A lighting device (1) is provided. The lighting device (1) comprises a number of radiators (4), each with a predefined beam angle and a predefined main beam direction. The radiators (4) are arranged substantially annularly around an axis of symmetry such that the main beam directions of the radiators (4) are inclined away from the axis of symmetry by a predefined angle of inclination to expand a maximum beam angle of the lighting device (1).

Description

[0001] The technical field of the present disclosure relates to lighting devices.

[0002] Lighting devices such as luminaires, for example ceiling lights or pendant lights, are known for room lighting. In order to comply with legal requirements, lighting devices with mercury-containing light sources, such as fluorescent lamps or halogen lamps, are being replaced with other lighting devices. Efficient and versatile LED solutions offer a climate-friendly and future-proof alternative to the prohibited light sources. Due to the different local conditions, converting existing lighting systems from fluorescent lamps to LED technology often presents a particular challenge. For some fluorescent lamps, such as ring-shaped mercury-containing fluorescent lamps, there are no LED replacement lamps that have the same light distribution or would enable the same functionality in dimming mode or emergency lighting operation. The existing luminaires orThe lighting systems installed in the ceilings thus become unusable. Instead of retrofitting existing systems, a complete redesign of the lighting systems is often carried out, with new luminaires and new installation points on the ceiling, which involves considerable technical and financial effort.

[0003] An object of the present application is to provide a lighting device which enables a simple and cost-effective conversion of existing lighting systems.

[0004] To achieve this objective, a lighting device is provided. The lighting device comprises a number of spotlights, in particular LED spotlights, each with a predefined beam angle and a predefined main beam direction. The spotlights are arranged essentially in a ring around an axis of symmetry such that the main beam directions of the spotlights are inclined away from the axis of symmetry by a predefined angle of inclination to expand the maximum beam angle of the lighting device.

[0005] The beam characteristics or the aperture angle of the spotlights can be selected in such a way that the light cones generated by the spotlights overlap. This makes it possible to achieve large-area room illumination or soft room light with smooth brightness transitions.

[0006] Due to the ring-shaped arrangement and the inclination of the spotlights relative to the axis of symmetry, essentially the entire half-space can be illuminated. In particular, in contrast to a parallel alignment of the spotlights, the inclination of the spotlights allows for larger illumination areas to be covered and significantly better illumination uniformity to be achieved.

[0007] In particular, the lighting device can largely simulate the radiation characteristics of a lighting device with an annular fluorescent lamp as the light source, so that the lighting device can serve as a replacement for lighting devices based on annular fluorescent lamp.

[0008] The lighting device thus makes it possible to do without luminaires based on mercury-containing fluorescent lamps without having to completely redesign the lighting or significantly impairing the radiation characteristics of the luminaires.

[0009] The lighting device may comprise a cover plate with a central opening, wherein the spotlights may be arranged on the cover plate around the central opening. The central opening allows access to the interior of the lighting device, which may facilitate the installation of the lighting device.

[0010] The central opening can be designed to accommodate a functional extension module or functional module of the lighting device. For example, the central opening can be designed to integrate a room ventilation element, e.g., a ventilation grille, additional lighting, such as emergency or safety lighting, or accent lighting, into the lighting device.

[0011] The lighting device can comprise a mounting device or mounting plate, wherein the mounting device can be designed such that a clear space is formed in the lighting device, in particular between the mounting device and the cover plate. The clear space can be used in particular during assembly of the lighting device, for example, to handle the mounting plate or mounting elements. Furthermore, the clear space can accommodate electrical components, such as driver components, electrical cables, and electrical connections. Furthermore, the clear space can be designed to at least partially accommodate one or more function expansion modules of the lighting device.

[0012] The spotlights can each have a beam angle of 30° to 45°, in particular from 33° to 39°, and especially from 35° to 37°. The beam angle here refers to the full width half maximum of the intensity distribution. In particular, the beam angle of the spotlights can be approximately 36°. With such a beam angle, large-area illumination can be achieved with a small number of spotlights.

[0013] The spotlights' tilt angle can be between 3° and 17°, particularly between 8° and 12°, and especially between 9° and 12°. In particular, the tilt angle can be approximately 10°. With such tilt angles, relatively uniform lighting can be achieved in rooms of varying dimensions.

[0014] The lighting device can have an overall beam pattern with a maximum overall opening angle of 50° to 60°, in particular 52° to 58°, especially 55° to 57°. In particular, the overall opening angle can be approximately 56°. With such an overall opening angle of the lighting device, a recessed ceiling luminaire based on a ring-shaped fluorescent lamp can be simulated.

[0015] The spotlights can, in particular, be designed as replaceable spotlight modules. In particular, the spotlights can be designed to be replaced as needed. Due to the interchangeability of the spotlights, the lighting device can be easily upgraded or converted if necessary.

[0016] In some embodiments, the radiators are designed to be replaced without tools. Because the radiators can be replaced without tools, they can be replaced particularly easily and quickly when needed.

[0017] The invention will now be explained in more detail with reference to the accompanying figures. The same reference numerals are used throughout the figures for identical or equivalent parts. Fig. 1 shows a schematic front view of a lighting device according to an embodiment, Fig. 2 shows a schematic rear view of the lighting device according to Fig. 1 , Fig. 3 shows a schematic side view of the lighting device according to Fig. 1 , Fig. 4 shows schematically a perspective rear view of the lighting device according to Fig. 1 , Fig. 5 shows a perspective front view of the lighting device according to an embodiment, and Fig. 6 shows results of a light simulation for a lighting system with lighting devices designed as recessed ceiling luminaires.

[0018] Fig. 1 shows a schematic front view of a lighting device according to an exemplary embodiment. The lighting device 1 comprises a cover plate 2 with a central opening 3 and spotlights 4, wherein the spotlights 4 are arranged on the cover plate 2 in a ring around the central opening 3.

[0019] The spotlights 4 are designed as so-called LED spotlights and each comprise an LED light source 5 and beam-forming optics 6 consisting of a transparent optic (lens) and a reflector for forming a light with a predefined radiation characteristic.

[0020] The spotlights 4 are slightly tilted outwards, which Fig. 1 can be seen from the asymmetric rings of the beam-shaping optics 6.

[0021] The lighting device 1 further comprises a mounting device or mounting plate 7 with mounting slots 8, which in the front view of the Fig. 1 are only partially visible through the central opening 3. In addition, Fig. 1 electrical connections 9 for connecting the spotlights 4 are visible.

[0022] In the illustrated embodiment, the lighting device 1 comprises six radiators 4 and has a substantially axially symmetrical shape with an axis of symmetry perpendicular to the image plane. In the illustrated embodiment, the cover plate 2 has an outer diameter of approximately 466 mm and an inner diameter of approximately 180 mm. Depending on the embodiment, the cover plate 2 can have different dimensions.

[0023] Fig. 2 shows a schematic rear view of the lighting device according to Fig. 1 In particular, Fig. 2 The cover plate 2, the spotlights 4, and the mounting plate 7 are seen from the rear. The spotlights 4 have heat sinks 10 and spring-loaded mounting clips 11 for attaching the spotlights 4 to the cover plate 2. An electrical driver 12 is mounted on the rear of the mounting plate 7.

[0024] The lighting device 1 has mechanical supports 13 or brackets for mechanically fixing the mounting plate 7 relative to the cover plate 2. In the illustrated embodiment, the mechanical supports 13 are dimensioned to fit within a circle with a diameter of approximately 418 mm. This ensures that a sufficient edge area remains so that the lighting device 1 can be inserted into a recess provided for this purpose in a luminaire housing or a ceiling box.

[0025] The slots 8 are designed to accommodate mounting elements, such as mounting pins and / or screws, and have a length of 50 mm and a width of 5.6 mm. The slots 8 are radially aligned and arranged diametrically opposite each other at a distance of 116 mm from each other.

[0026] Fig. 3 shows a schematic side view of the lighting device according to Fig. 1 . In the side view of the Fig. 3 The spatial arrangement of the components of the lighting device 1 is particularly clearly visible. In particular, the mounting plate 7 has adjustable feet 14, with which the mounting plate 7 is fastened to the supports 13. The supports 13 and the adjustable feet 14 are dimensioned such that a distance of approximately 131.50 mm exists between the mounting plate 7 and the cover plate 2. This ensures, in particular, that the lighting device fits into a designated installation space and that sufficient space remains for handling mounting devices during installation of the lighting device.

[0027] Also visible are supports 15 of the radiators, which are designed to hold the radiators 4 in a position inclined at an angle of 10°. The supports 15 are particularly designed so that they can serve both as beam-shaping elements 5 for shaping the radiation characteristics of the radiators 4 and as supporting elements for fixing the radiators at a predetermined angle of inclination.

[0028] In the embodiment shown, the lighting device 1 has a maximum beam angle or total opening angle of 56°, which is due both to the opening angles of the individual radiators 4 and to the inclination of the radiators 4 with respect to the axis of symmetry of the lighting device 1.

[0029] By inclining the spotlights 4, the maximum beam angle of the lighting device can be extended, so that a wider beam characteristic of the entire lighting device 1 can be achieved than of the individual spotlights or spots.

[0030] Fig. 4 shows schematically a perspective rear view of the lighting device according to Fig. 1 . As can be seen from the perspective representation of the Fig. 4 As can be seen, there is a clear space 16 between the individual components of the lighting device 1, which is accessible through the central opening 3.

[0031] The clear space 16 can be used in particular during the installation of the lighting device 1, for example, to mount the mounting plate 7 to the ceiling of a room. Furthermore, the clear space 16 provides space for the electrician to connect, for example, the electrical connections 9 and / or the driver 12 to a power supply.

[0032] Fig. 5 shows a perspective front view of the lighting device according to an embodiment. In the embodiment of the Fig. 5 The lighting device 1 has a central module 17 accommodated in the central opening 3. The central module 17 can comprise a decorative cover, a warning light, a signal light, a ventilation grille, a communication module, and / or another functional element.

[0033] In the illustrated embodiment, the lighting device 1 has six radiators 4, which are inclined outward by approximately 10° with respect to an axis of symmetry (not shown) of the lighting device 1. Depending on the design, the radiators 4 can have an angle of inclination with respect to the axis of symmetry of the lighting device 1 of 3° to 17°, in particular of 8° and 12°, especially of 9° to 12°.

[0034] In some embodiments, the radiators 4 each have a radiation angle of 30° to 45°, in particular of 33° to 39°, especially of 35° to 37°.

[0035] The overall radiation characteristics of the lighting device 1 can be influenced by the inclination of the spotlights 4. In particular, the maximum radiation angle of the lighting device 1 can be increased due to the inclination of the spotlights 4.

[0036] In the illustrated embodiment, the maximum beam angle is 56°. Depending on the design, the lighting device 1 can have a maximum beam angle of 50° to 60°, in particular 52° to 58°, especially 55° to 57°.

[0037] Due to the largely symmetrical shape and the maximum beam angle of approximately 56°, the lighting device 1 can serve as a replacement for recessed ceiling luminaires with ring-shaped fluorescent lamps.

[0038] The lighting performance of the lighting device was verified by simulating a lighting system with lighting devices each containing six spotlights, each with an inclination angle of 10° and each with a light output of 450 lm.

[0039] Fig. 6 shows the results of a lighting simulation for a lighting system with recessed ceiling luminaires. In particular, Fig. 6 Simulation results for lighting devices according to the embodiment of the Fig. 5 , which are distributed across the ceiling to illuminate a room. In the illustrated example, the light point height or mounting height of the lighting devices is 4 m and the distance between adjacent lighting devices is 2.5 m.

[0040] The lighting of the room is characterized by the spatial distribution of the illuminance, which is Fig. 6 is visualized as an isolux diagram for a room area with five lighting devices 1, each with six spotlights 4. The spotlights 4 are in Fig. 6 shown as dark dots.

[0041] To illustrate the influence of the inclination of the radiators 4, Fig. 6 Simulation results for two different cases are shown. The upper image corresponds to the case where the spotlights 4 of the lighting devices are tilted outward at an angle of 10° from the symmetry axis of the lighting devices.

[0042] The lower image corresponds to the case when the spotlights 4 are aligned parallel to the axis of symmetry of the lighting devices 1 or vertically or to the ceiling of the room.

[0043] As can be seen from the isolux diagrams, the upper illuminance distribution exhibits significantly greater homogeneity than the lower illuminance distribution. In particular, the illuminance in the upper diagram exhibits a smaller variation from 250 lx to 450 lx. The lower diagram exhibits a greater variation in illuminance from 200 lx to 500 lx. Furthermore, the lower diagram exhibits clearly pronounced hotspots with locally increased illuminance, particularly directly below the lighting devices 1.

[0044] By tilting the spotlights 4 by 10°, a significant improvement in room lighting can be achieved with only a slight increase in glare.

[0045] Depending on the application or lighting plan, the number, inclination and beam characteristics of the spotlights can be selected differently.

[0046] In particular, the lighting device 1 can be mounted in the same position or location as the luminaire to be replaced without noticeably impairing the room lighting. The lighting device 1 can be mounted very easily and electrically connected to the existing connection point.

[0047] To retrofit an existing lighting system with recessed ceiling luminaires, the existing recessed luminaires do not need to be completely removed or replaced. The existing housings of the luminaires to be replaced can also be recycled.

[0048] To install the lighting device 1, the existing light source, such as a ring-shaped fluorescent lamp, can be removed from the already installed luminaire in a first step. In some luminaires, a cover must first be removed to gain access to the light source.

[0049] After the lamp has been removed from the luminaire, the lighting device 1 can be inserted into the rear of the existing housing of the luminaire or into the ceiling tank.

[0050] In a subsequent step, the mounting plate 7 can be mounted in the luminaire housing or ceiling box. The mounting plate 7 can be secured using mounting elements such as screw pins and / or screws accommodated in the slots 8. The mounting location of the mounting plate 7 is easily accessible through the central opening 3, allowing the mounting plate 7 to be easily and securely mounted to the ceiling.

[0051] In a further step, the driver 12 can be connected to a power supply, and the electrical connections 9 can be electrically connected to the driver 12. The central opening 3 provides access to the intermediate space 16, allowing the electrician to easily perform these actions.

[0052] As a result, a fluorescent-based ceiling light is replaced by an energy-efficient, environmentally friendly, LED-based light with similar beam characteristics and an attractive design.

[0053] In some embodiments, a central module 17 or a cover is subsequently inserted into the central opening 3. In particular, the central module 17 can be designed to provide one or more additional functions, depending on the design.

[0054] In some embodiments, the lighting device 1 has a DALI (Digital Addressable Lighting Interface) interface. DALI® is a registered trademark of the IEEE Industry Standards and Technology Organization. The DALI interface can, in particular, be integrated into the driver 9.

[0055] The lighting device can be designed as a recessed, in particular recessed ceiling luminaire, a surface-mounted, in particular surface-mounted ceiling luminaire, and / or as a pendant luminaire. It is also conceivable for the spotlights to have a tilt adjustment mechanism so that the tilt angle can be adjusted depending on the application or operating conditions. The tilt adjustment mechanism can also be designed so that the tilt angles of all spotlights remain the same when adjusting the tilt angles. Thus, the light distribution of the lighting device 1 can maintain its symmetrical shape and the illumination of the entire half-space.

[0056] Although at least one exemplary embodiment has been shown in the foregoing description, various changes and modifications may be made. The recited embodiments are merely examples and are not intended to limit the scope, applicability, or configuration of the present disclosure in any way. Rather, the foregoing description provides those skilled in the art with a road map for implementing at least one exemplary embodiment; numerous changes may be made in the function and arrangement of elements described in an exemplary embodiment without departing from the scope of the appended claims and their legal equivalents. Furthermore, multiple modules or multiple products may be connected together in accordance with the principles described herein to obtain additional functions. List of reference symbols

[0057] 1Lighting device 2Cover plate 3Central opening 4Spotlight 5Light source 6Beam-shaping element 7Mounting plate 8Slot 9Electrical connection 10Heat sink 11Mounting clip 12Electrical driver 13Support 14Adjustable feet 15Support 16Light gap 17Central module

Claims

1. Lighting device comprising a number of radiators (4), each with a predefined radiation angle and with a predefined main radiation direction, wherein the radiators (4) are arranged substantially in a ring around an axis of symmetry such that the main radiation directions of the radiators (4) are inclined away from the axis of symmetry by a predefined angle of inclination in order to expand a maximum radiation angle of the lighting device (1).

2. Lighting device according to claim 1, wherein the lighting device (1) comprises a cover plate (2) with a central opening (3), and wherein the radiators (4) are arranged on the cover plate (2) around the central opening (3).

3. Lighting device according to claim 2, wherein the central opening (3) is designed to accommodate a function extension module of the lighting device (1).

4. Lighting device according to claim 2 or 3, wherein the lighting device (1) comprises a mounting device (7), and wherein the mounting device (7) is designed such that a clear space (16) is formed in the lighting device (1).

5. Lighting device according to one of the preceding claims, wherein the radiators (4) each have a radiation angle of 30° to 45°, in particular of 33° to 39°, especially of 35° to 37°.

6. Lighting device according to one of the preceding claims, wherein the angle of inclination is between 3° and 17°, in particular between 8° and 12°, especially 9° to 12°.

7. Lighting device according to one of the preceding claims, wherein the lighting device (1) has an overall radiation characteristic with a maximum radiation angle of 50° to 60°, in particular 52° to 58°, especially 55° to 57°.

8. Lighting device according to one of the preceding claims, wherein the radiators (1) are designed as replaceable radiator modules.

9. Lighting device according to claim 8, wherein the radiator modules are designed to be replaced without tools.

10. Lighting device according to one of the preceding claims, wherein the lighting device is designed as a recessed ceiling light, a surface-mounted ceiling light and / or a pendant light.

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