WO2010057766A1

WO2010057766A1 - Lighting device for illumination purposes and lamp having such a lighting device

Info

Publication number: WO2010057766A1
Application number: PCT/EP2009/064491
Authority: WO
Inventors: Sven Aupperle; Johann Mitrowitsch
Original assignee: M I P Center Gmbh
Priority date: 2008-11-19
Filing date: 2009-11-03
Publication date: 2010-05-27
Also published as: DE102008058757A1; EP2356369A1

Abstract

The invention relates to a lighting device (20) for illuminating purposes, having a housing (22) in which at least one radiation element (24) is arranged in order to produce and emit electromagnetic radiation (26), wherein said housing comprises at least one radiation outlet element (28) through which at least a part of the radiation can pass from the housing to the outside, wherein in order to improve said lighting device in such a way that the life of said lighting device can be significantly extended compared to traditional lighting devices, it is proposed that the housing be designed completely closed and water- and water-vapor-tight. The invention further relates to an improved lamp (10).

Description

Lighting device for lighting purposes and luminaire with such a lighting device

The present invention relates to a lighting device for lighting purposes, comprising a housing, in which at least one radiation element is arranged for generating and emitting electromagnetic radiation, which housing has at least one radiation exit element, through which at least a portion of the radiation can pass out of the housing to the outside.

Furthermore, the present invention relates to a luminaire with a luminaire housing and a lamp housing for lighting purposes, which luminous device comprises a housing in which at least one radiation element is arranged for generating and emitting electromagnetic radiation, which housing has at least one radiation outlet element, through which at least one Part of the radiation can pass out of the housing to the outside.

Lighting devices of the type described above are used in particular in lights that are used outdoors or outside of closed rooms. As a result, the luminaires and consequently also the lighting devices used are inevitably exposed to the effects of the weather. In particular, strongly fluctuating temperatures and a high moisture content of the surrounding atmosphere has a negative effect on the life of both the lighting device and the lamp. Above all, at temperatures below 0 ° C., condensation of water vapor may occur in an interior of the lighting device, as a result of which damage to electronic components or connections may occur over time. It is therefore an object of the present invention to improve both a lighting device and a lamp of the type described above so that their life compared to conventional lighting devices and lights can be significantly extended.

This object is achieved according to the invention in a lighting device of the type described above, that the housing is completely closed, water and water vapor-tight.

The proposed design of the housing makes it possible in particular to completely dispense with a complete potting of the lighting device, that is to say to form a non-cast lighting device or a lighting device without casting. Such a complete encapsulation of the lighting device can adversely affect, in particular, the use of additional optics for selectively radiating the electromagnetic radiation generated and emitted by the at least one radiation element. The completely closed, water and water vapor-tight design of the housing thus forms a solution significantly improved to a complete Verguss. Overall, with the improved lighting device it is easily possible to achieve lifetimes of 20 and even more years. Thus, completely maintenance-free outdoor lights can be provided in principle, which are equipped with lighting devices according to the invention, whereby costs in maintenance and also resources and raw materials can be significantly reduced in the production of the lighting device. The radiation element is preferably used to generate electromagnetic radiation having a wavelength in the visible wavelength range by corresponding generation of electromagnetic radiation of the radiation element or superimposition of radiation of different wavelengths of two or more radiation elements can be generated and emitted especially for man as "white light" radiation become. It is favorable if the at least one radiation element comprises or is a light emitting diode which generates and emits electromagnetic radiation by electrical excitation. Due to the very high efficiency of an LED a highly efficient lighting device can thus be formed with a very low power consumption. Furthermore, the use of an LED as a radiation element also has a positive influence on the overall service life of the lighting device, since an LED compared to conventional light sources based on the principle of the black beam to produce visible light has a significantly longer life. The equipped with at least one LED lighting device can also be referred to as a so-called "LED light engine".

It is advantageous if the at least one radiation element comprises at least one luminescent element which is optically excitable with the radiation generated by the LED and emits electromagnetic radiation having a wavelength which is greater than the wavelength of the radiation generated by the LED as a result of the optical excitation. As a result, light with a wavelength can be emitted by the luminescence element which generates light with a specific color, for example "white light", by superposition with the light of a specific wavelength or a specific wavelength spectrum for human beings emitted directly by the radiation element. For example, the LED could emit blue light and optically excite a luminescent element, which itself emits light in the green, yellow and red spectral range, so that the overall impression "white light" can be awakened by an observer by overlaying the optical spectra of the LED and the luminescent element. Preferably, the luminescent element is selected so that at least approximately an optical spectrum is formed by superposition, which corresponds to the spectrum of a black body in the visible spectral range between about 400 nm and 750 nm. Advantageously, the at least one luminescent element is a fluorescent and / or a phosphorescent element, which fluoresces as a result of the optical excitation and / or phosphorescent. Depending on the intended use of the lighting device, it is possible for phosphorescence elements to be preferred with a radiation of light that decays more slowly compared to fluorescent elements, or vice versa.

Particularly simple is the structure of the lighting device, when the at least one luminescent element in the form of a LED at least partially surrounding layer or coating is formed. This embodiment makes it possible to directly use the portion of the radiation generated by the LED for a transformation into a spectral range having a greater wavelength. A corresponding yield of this secondary radiation radiated by the luminescent element can in particular be set by a thickness of the layer or coating.

Thus, the lighting device can not be damaged in an undesirable manner, it is advantageous if the housing is designed unöffenbar. In particular, by the long life of the lighting device, this can thus be designed as a disposable product and, as described, unöffenbar. Since the lighting device preferably has a very long life and is maintenance-free, the unöffenbare training of the housing also has the advantage that accidental damage that may occur when opening the case, can be completely ruled out.

Advantageously, the housing is designed such that it is destroyed when opening or irreparably damaged. This embodiment prevents it, in particular open an openable housing, so that the lighting device can not be improperly changed or manipulated.

According to a further preferred embodiment of the invention it can be provided that the housing defines a housing interior, which has a housing interior volume which is greater than one of the at least one radiation element defined radiation element volume. Such a housing makes it possible, in particular, to arrange further components in the interior of the housing, apart from the at least one radiation element. Furthermore, such a housing size offers the option of additionally filling a protective gas or inert gas into the housing interior in order to additionally exclude or reduce any aging processes.

It may also be advantageous if a secondary optics is provided for the defined emission of the electromagnetic radiation emitted by the at least one radiation element. The secondary optics can preferably be arranged in the housing interior and thus protected. With the secondary optics in particular desired illuminations can be achieved with the lighting device, for example, even angular surfaces with radiation elements in the form of spotlights.

The secondary optics is expediently designed for the defined emission of the electromagnetic radiation emitted by the at least one radiation element through the at least one radiation exit element. In this way, in addition, the efficiency of the lighting device can be increased because virtually all of the radiation generated by the radiation element can be used for lighting purposes.

Particularly simple is the structure of the lighting device when the secondary optics comprises at least one optical component for deflecting and / or focusing and / or diverging the radiation generated by the at least one radiation element. By means of the at least one optical component, the radiation generated by the radiation element can be deflected, focused or widened in the desired manner.

Particularly cost-effective and easy to manufacture, the lighting device, if the at least one device is a lens or a mirror. Of course, lenses or mirrors or other types of optical components are combined together to form the secondary optics.

The secondary optics is preferably designed to generate a beam, which is rectangular in cross section, of the generated radiation, that is to say of a rectangular beam cross section. Such secondary optics are particularly well suited to illuminate streets or paths. In particular, such an overlapping of radiation fields of adjacent luminaires with lighting devices according to the invention can be influenced in a targeted manner.

In order to make it possible for the person to see as visible and / or pleasant lighting with the lighting device, it is advantageous if the at least one LED emits electromagnetic radiation having a wavelength in a wavelength range of 300 nm to 800 nm.

In particular, when the LED is used to excite a luminescent element, it is advantageous if the at least one LED emits electromagnetic radiation having a wavelength in a wavelength range of 410 nm to 510 nm. Such a light-emitting diode emits predominantly as blue light detectable electromagnetic radiation for humans, which can be used in particular for the excitation of luminescent elements which emit light of longer wavelengths in a higher wavelength range.

In order to enable the best possible radiation exit for the radiation generated by the at least one radiation element, it is favorable if a housing wall of the housing is formed wholly or partly by the at least one radiation exit element.

Advantageously, the at least one radiation exit element transmits electromagnetic radiation in a wavelength range of 300 nm to 800 nm. Thus, the radiation generated by the at least one radiation element can be virtually completely through the radiation exit element escape. Losses, in particular heating of the lighting device by absorption of radiation, can thus be minimized.

It is favorable if the at least one radiation exit element transmits electromagnetic radiation in a wavelength range from 410 nm to 750 nm. In particular, visible light can pass through the radiation exit element.

In order to achieve a particularly good efficiency of the lighting device, it is advantageous if the at least one radiation outlet element has a transmission of at least 75%.

The efficiency of the lighting device can be further improved if the transmission of the radiation outlet element is at least 95%. Preferably, the transmission is more than 98%.

The lighting device is particularly simple to manufacture if the at least one radiation outlet element is designed in the form of a disk which transmits electromagnetic radiation.

The production can be further simplified and further reduce the cost of the lighting device, if the disc is made of glass or a plastic.

The production of the lighting device can be further simplified if the housing is formed from at least two housing parts, which are connected to each other by gluing. Of course, the housing can also be made of three, four, five, six, seven or even more parts by gluing.

The production of the lighting device can be further simplified if the at least two housing parts are connected to each other only by gluing. An exclusive adhesive bond of the at least two housings Parts makes additional fasteners such as screws, interlocking locking elements and the like superfluous.

Preferably, the at least two housing parts are connected to one another with an adhesive. This embodiment is particularly favorable when the at least two housing parts are not made of a self-adhesive material.

Preferably, the adhesive is water and water vapor impermeable. The use of such an adhesive makes it possible to seal the housing impermeable to water and water vapor, solely by bonding the at least two housing parts. In this way, the adhesive can fulfill two functions, namely on the one hand connect the at least two housing parts together and on the other hand to completely close the housing and seal a total water and water vapor impermeable.

Thus, the lighting device can withstand large temperature fluctuations, it is advantageous if the adhesive is permanently elastic. In particular, when the at least two housing parts are made of different materials which have different thermal expansion coefficients, the permanently elastic adhesive makes it possible to compensate for different expansions of the at least two housing parts.

In order to avoid the destruction of the adhesive and thus the lighting device, in particular under irradiation with sunlight, it is advantageous if the adhesive is UV-resistant.

The lighting device can be produced in a particularly simple and cost-effective manner if the adhesive is a butyl adhesive. This can in particular be permanently elastic, UV-resistant and water and water vapor impermeable. Preferably, the butyl adhesive is isobutylene. Due to the internal bonding, in particular a diffusion barrier for water vapor can be formed, which is preferably elastic. The at least two housing parts of the lighting device can be easily connected when the adhesive forms part of an adhesive tape. The at least two housing parts can then be connected to one another in particular without the use of a liquid adhesive or of an adhesive which is sufficiently viscous at least for this purpose.

A particularly simple construction of the lighting device can be achieved, for example, in that the housing comprises a housing bottom or a housing trough which are connected directly or indirectly to the radiation outlet element. For example, a radiation outlet element can close a housing tub with a bottom and peripheral side walls directly. It would also be conceivable to provide a housing bottom with corresponding spacer elements which keep the radiation exit element spaced from the housing bottom so that it can be connected indirectly to the radiation exit element via the spacer elements.

Advantageously, the housing comprises at least one spacer which is arranged between the housing bottom or the housing trough on the one hand and the radiation outlet on the other hand for holding the housing bottom and / or the housing trough on the one hand and the radiation outlet on the other hand at a defined distance from each other. The at least one spacer element can be permanently connected to the housing bottom and thus form together with this a housing tray. It is also conceivable to form the at least one spacer element in the form of a separate housing part and to connect it to the housing bottom or the housing pan, for example by gluing.

In a simple manner, a housing wall can be formed if the at least one spacer element surrounds a housing interior defined by the housing in an annular or circumferential manner. The housing interior is preferably limited in this case by the housing bottom or the housing pan, the at least one spacer element and the at least one radiation outlet. step element or a housing part, which is partially closed by the at least one radiation outlet element.

Preferably, the at least one spacer element forms at least a part of at least one housing wall of the housing. For example, two or more spacer elements may form a housing wall of the housing. It is advantageous if each lateral housing wall is formed by a spacer or all side walls of the housing by a single circumferential spacer.

A particularly lightweight and compact construction of the lighting device can be achieved, in particular, in that the at least one spacer element is hollow or partially hollow. Furthermore, by a corresponding profiling of the spacer and its stability and thus the stability of the lighting device can be increased overall.

According to a further preferred embodiment of the invention it can be provided that the at least one hollow or partially hollow spacer element defines at least one spacer interior and at least one perforation for establishing a fluid connection between the housing interior and the at least one spacer interior. In this way, in particular a volume of the housing interior can be increased. This has the advantage that a concentration of gases or other volatile substances which are contained in the housing interior, due to the increase in volume by the volume of the Abstandselementinnenraums is somewhat reduced. Furthermore, a gas or particle flow from the spacer interior into the housing interior or vice versa can be made possible by the fluid connection.

In order to improve the fluid connection between the housing interior and the spacer interior, it is advantageous if the at least one hollow or partially hollow spacer has a plurality of perforations. A residual moisture can be removed after closing the housing from the housing interior in a simple manner, for example, characterized in that the housing contains a desiccant inside. A desiccant makes it possible to bind moisture. These may be water or other volatile substances.

Handling of the desiccant becomes particularly easy if it is contained in at least one desiccant container or held on a desiccant carrier. A desiccant container may, for example, be in the form of a sack or a bag. Alternatively, it would be conceivable to introduce the desiccant directly into the housing interior, for example in powder form.

Advantageously, the at least one hollow or partially hollow spacer forms the at least one desiccant container. The at least one spacer element can thus assume a dual function, namely on the one hand to specify a distance between the housing bottom or a housing tub and the at least one radiation outlet element and on the other hand to facilitate the handling of the drying agent by introducing the drying agent in the spacer interior. As a result of the at least one perforation and the resulting fluid connection between the interior of the housing and the at least one spacing element interior, the desiccant can be used to dehumidify the interior of the housing.

Conveniently, the drying agent is or comprises a molecular sieve. A molecular sieve in the present case is to be understood as any substance which has a strong adsorption capacity for gases, vapors and solutes with specific molecular sizes. Preferably, the molecular sieve has a large internal surface area of at least 500 m ² / g and uniform pore diameters which are of the order of the diameters of molecules. The pore sizes are preferably 0.3 to 1.0 nm. It would be conceivable It also uses molecular sieves with a moisture indicator to indicate that the capacity limit has been reached.

It is particularly favorable if the drying agent comprises or is a natural or synthetic zeolite and / or a silica gel. Desiccants of this kind are outstandingly suitable for removing residual moisture remaining in the housing interior after production.

The handling of the desiccant becomes particularly easy when used as a solid, for example powder, rod or bead.

Advantageously, the drying agent is designed to adsorb water and / or water vapor contained in the housing interior. Thus, a residual concentration of water or water vapor can be removed from the housing interior in a simple manner.

The production and the construction of the lighting device can be further simplified if the at least one radiation element is arranged on a circuit board or a housing bottom or a housing trough of the housing. Thus, at the same time a storage or support for the at least one radiation element created and at the same time a part of the housing can be formed.

If a circuit board should be provided, it is advantageous if it is connected to the housing bottom or the housing pan. Through the connection, the arrangement of the at least one radiation element in the housing interior can be defined. Furthermore, a mechanical stability of the lighting device is improved.

In order to arrange the lighting device defined on a lamp, it is advantageous if at least one mechanical connecting element is provided on the housing for connecting the lighting device to a lamp housing of a lamp. The connecting element can be any desired be formed, in particular for forming a screw, snap, snap or clamp connection between the housing and the lamp, for example, a lamp housing thereof, which may optionally have corresponding connecting elements.

Particularly simple is the structure of the lighting device when the at least one connecting element is designed in the form of a threaded pin or a blind hole. Thus, the lighting device can be easily and securely bolted to the lamp housing of the lamp.

Conveniently, the at least one spacer element is arranged such that it forms neither completely nor partially an outer surface of the housing. In other words, it is preferably not visible from the outside. Thus, it can be optimally protected, for example, when it is connected with a permanently elastic adhesive to a housing bottom or a housing trough on the one hand and at least one radiation outlet element on the other hand.

According to a further preferred embodiment of the invention may further be provided away from the housing interior, the at least one spacer at least partially covering cover. The cover provides protection in particular for the spacer element and optionally also for a connection, in particular an adhesive connection, between the at least one spacer element and the housing parts, with which the spacer element is connected. Furthermore, the cover can be used to increase the overall stability of the lighting device. It may in particular be rigid and inelastic. The cover can thus in particular also form a seal, depending on the material used an elastic, preferably gas-tight.

Conveniently, the cover completely covers the at least one spacer element pointing away from the interior of the housing. Thus, the spacer element is completely protected from the outside by the cover, with appropriate Embodiment of the cover and joints, in particular splices or contacts between the at least one spacer element and a housing bottom or a housing pan on the one hand and the at least one radiation outlet element on the other.

In principle, it would be conceivable and also possible to attach the cover after connecting the at least one spacer element to a housing bottom or a housing trough, on the one hand, and to the at least one radiation outlet element, on the other hand. However, the production, in particular the mounting, of the lighting device is further simplified if the cover is designed in the form of an at least one-sided coating of the spacer element.

It is favorable if the cover is elastic, preferably permanently elastic. Thus, a stable and secure connection of the cover to the housing can be ensured in particular in an embodiment of the housing of a plurality of housing parts with different thermal expansion coefficients even with large temperature fluctuations.

In order to protect any connection, especially splices, from the weather or contact with aggressive media, it is advantageous if the cover covers at least a portion of the splices between individual parts of the housing. Preferably, the cover covers all splices and thus forms a second seal of the housing or a seal of the splices.

The cover can be manufactured simply and safely if it contains or is silicone and / or polyurethane and / or polysulfide.

Conveniently, the lighting device comprises two or more radiation elements. In particular, for the formation of street lights, it is advantageous to use a large number of radiation elements in order to ensure a desired illumination can. In principle, it would be conceivable to arrange the radiation elements as desired. Preferably, the radiation elements are arranged individually and / or a plurality of radiation elements together in one or more radiation element groups. The radiation element groups can in particular define cluster-like arrangements of radiation elements, which are arranged, for example, in rows or in the form of regular patterns or in matrix form. The design of a radiation element group can itself be formed in matrix or row form or in any desired pattern.

In order to supply the at least one radiation element with electrical energy, it would be conceivable to provide a network-independent power supply in the housing interior. It is favorable, however, if one or more electrically conductive connections are provided through the housing for connecting the at least one radiation element to an electrical power supply. The electrically conductive connections can in particular be connected directly to the at least one radiation element or to a control and / or regulating circuit arranged in the housing, with which the at least one radiation element can be controlled and / or regulated.

So that the one or more electrically conductive connections do not lead to a leakage of the housing, it is advantageous if they are guided in a water-tight and water vapor-tight manner through the housing. In particular, any intended perforations of the housing, for example a housing bottom or a housing tub, may be connected to an adhesive which serves to connect the at least two housing parts of the housing and which is described in detail above in different variants with its corresponding advantages.

In order to dissipate heat generated by the lighting device optimally, it is advantageous if at least a part of the housing is made of a metal. Preferably, the metal is aluminum, which is very resistant to corrosion due to the formation of an oxide layer.

Advantageously, the housing interior is filled with a protective gas. Thus, permanently oxidizing processes in the housing interior can be suppressed.

It is favorable if the protective gas is an inert gas. In particular, nitrogen and / or argon is suitable as a protective gas.

The object stated in the introduction is also achieved according to the invention in a luminaire of the type described above in that the housing is completely closed, water-tight and water vapor-tight. As a result of the thus improved design of the housing of the lighting device, in particular a luminaire with a long service life can be made available, which is essentially maintenance-free.

It is advantageous if the lamp is designed in the form of an outdoor lamp. The lamp can then be used in particular outdoors or outside of closed rooms, which due to the special design of the lighting device of the lamp readily very long service life and thus long maintenance intervals allowed, despite strong weather conditions.

Preferably, the lamp is in the form of a street or sidewalk lamp. With such a luminaire can be permanently illuminate streets and walkways or the like, without requiring maintenance of the lamp, in particular the lighting device.

It is advantageous to use the lighting device outdoors or outside of closed rooms. Such a use is advantageous because of the completely closed, so hermetically sealed housing aging due to external influences, in particular weather influences, can be excluded.

The following description of preferred embodiments of the invention is used in conjunction with the drawings for further explanation. Show it:

Figure 1: a street or pavement lamp comprising a lighting device;

FIG. 2 is a perspective view of a lighting device shown in FIG. 1;

FIG. 3 shows a plan view of the lighting device shown in FIG. 2;

Figure 4 is a sectional view taken along line 4-4 in Figure 3; and

FIG. 5: an enlarged view of the detail A from FIG. 4.

In FIG. 1, by way of example, a luminaire provided overall with the reference numeral 10 in the form of a streetlight or pavement luminaire for illuminating a road 12 or a sidewalk 14 is shown.

The luminaire 10 comprises a vertical mast 16, at whose end facing away from the walkway 14, a luminaire housing 18 is arranged. The luminaire housing 18 can be open or provided with a window made of glass or plastic, or closed, pointing downwards. In the interior of the luminaire housing 18 there is a luminous device provided overall with the reference numeral 20 for illumination purposes, specifically in the form of an LED light engine.

The lighting device 20 comprises a housing 22, in which at least one, in the embodiment shown in the figures, a plurality of Radiation elements 24 for generating and emitting electromagnetic radiation 26 is arranged. The housing 22 comprises at least one radiation outlet element 28. This is preferably in the form of a disk, for example made of glass or a plastic. In the embodiment shown in the figures, a single radiation outlet element 28 is provided which forms a complete side surface 30 of the lighting device 20.

The radiation elements 24 are preferably in the form of electromagnetic emission generating and emitting light emitting diodes 32 (LEDs) formed by electrical stimulation and arranged on a housing 22 held or mounted in the housing 34. The circuit board 34 in turn itself is connected by means of conventional fastening techniques, for example by screwing or latching, with a housing bottom 36 of the lighting device 20. The housing bottom 36 itself is again in the form of a simple plate, which is about two to three times as thick as the radiation outlet element 28.

The housing 22 further comprises four cuboid side walls 38, which each form a housing part and at the same time define a spacer element 40. The spacer 40 is partially or completely hollow and defines in its interior a spacer interior 42.

The housing bottom 36, the radiation outlet element 28 and the four spacer elements 40 define a housing interior 44 inside the housing 22. A wall or wall surface 46 of the spacer element 40 facing the housing interior 44 is provided with one or more perforations 48, in the form of bores or other openings of any shape for establishing a fluid connection between the housing interior 44 and the spacer interior 42nd

The spacing element 40, as shown in particular in FIG. 5, is connected to the radiation outlet element 28 and the housing bottom 36. sticks. For this purpose, an adhesive 50 is used and introduced between the housing parts to be joined together. The adhesive 50 is water and water vapor impermeable and preferably permanently elastic and UV resistant. The adhesive 50 is preferably a butyl adhesive, in particular isobutylene. The adhesive 50 can also be applied on one or both sides of a tape to form an adhesive tape or be introduced directly between the parts to be joined together.

The housing bottom 36 and the spacer elements 40 may optionally be integrally formed to form a housing, not shown in the figures. Regardless of whether integrally connected to the housing bottom 36 or not, the spacer elements 40 together surround the housing space annular or circumferential. Optionally, the spacer elements 40 may also be integrally connected to one another, for example to form a spacer ring. Furthermore, the spacer elements 40 may also be only partially hollow, that is to say the spacer element interior 42 can also be significantly smaller than the volume bounded by its outer surfaces by the respective spacer element 40. The spacer is used in particular for holding the housing bottom 36 and the radiation outlet element 28 at a defined distance from each other.

The spacer element 40 is based on end faces 52 of the housing bottom 36 and end faces 54 of the radiation outlet element 28 slightly set back, by about its thickness. The defined by the reset recess 56, which surrounds the or the spacer elements 40 as circumferentially or annular as the spacer elements 40 the housing interior 44, is filled with a cover 58. It thus covers the at least one spacer 40 away from the housing interior 44 completely facing away. The cover 58 is formed of an elastic material. Alternatively, it may be provided in the form of an at least one-sided coating of the spacer element 40, in which case sealing lip-like projections preferably form on the cover 58 on the front side. Det can be to ensure optimal sealing of the cover 58 relative to the radiation outlet element 28 and the housing bottom 36. As can be clearly seen in FIG. 5, the cover 58 covers not only a portion of the adhesive layer 60 of the housing defined by the adhesive 50 between the radiation exit element 28 and the spacer 40 on the one hand and the spacer element 40 and the housing bottom 36 on the other hand Splices between individual parts of the case, but all. The cover 58 is preferably made of silicone and / or polyurethane and / or polysulfides or contains the materials mentioned. By providing the cover 58, the at least one spacer element 40 neither completely nor partially forms an outer surface of the housing 22.

Due to the internal bonding with the adhesive 50, an elastic diffusion barrier for water vapor is formed, so that neither water nor water vapor can penetrate into the housing interior 44 or escape from it. The cover 58, which may also be referred to as an external bond, also forms an elastic, gas-tight seal so as to ensure a total double seal of the housing interior by the cover 58 for covering joints between housing parts. Due to the permanently elastic connection of the housing parts and the permanently elastic design of the cover 58, different thermal expansion coefficients of the materials used to form the housing 22 can be tolerated. This is of particular importance when the housing bottom 36 is made of a metal, such as aluminum or stainless steel, and the radiation exit member 28 made of glass or a plastic having a small coefficient of thermal expansion.

In order to be able to arrange the housing 22 securely in the luminaire housing 28, it preferably comprises at least one mechanical connecting element 62, which is preferably designed in the form of a blind hole 62 shown by way of example in FIG. 4 or alternatively in the form of a threaded pin can, which are with corresponding connection elements on the lamp housing 18 of the lamp 10 in engagement and can be connected.

By the selected connection of the housing parts by gluing the housing 22 is formed total unöffenbar. If it is to be opened, then it is destroyed due to its construction when opening or irreparably damaged, in particular, the hermetic seal of the housing 22 is no longer guaranteed.

The housing interior 44 preferably defines a housing interior volume which is greater than a radiation element volume defined by all the radiation elements 24. This makes it possible to arrange or provide further components in the housing interior 44, for example a secondary optics 64 for the defined emission of the electromagnetic radiation 26 emitted by the radiation element or elements 24. The secondary optics 64 can comprise a plurality of optical components 66 for deflecting and / or focusing and / or Diverging the radiation 26 generated by the radiation element or elements 24. The secondary optics 64 thus essentially serve the purpose of a defined emission and passage of the electromagnetic radiation 26 emitted by the at least one radiation element 24 through the radiation exit element or elements 28. The optical components 66 used in the exemplary embodiment illustrated in the figures are in the form of complex mirrors 68 or mirrored surfaces which multiply reflect the radiation 26 and pass through the radiation exit element 28 with an overall rectangular radiation cross section. As an alternative or in addition to the mirrors 68, optical lenses not shown in the figures can also be used.

In the production of the lighting device 20, it is almost inevitable that after closing the housing 22 a certain residual moisture in the housing interior 44 remains. This is the task of a introduced in the housing interior 44 drying agent 70. It can, for example be introduced directly into the housing interior 44 and be formed powder, rod or bead-shaped. Preferably, it is contained in a desiccant container 72 and / or held on a desiccant carrier 74. In particular, it is favorable to use the at least partially hollow spacer element 40 as desiccant container 72. If the perforations 48 are made correspondingly small, the desiccant 70 is held securely in the spacer interior, but water molecules contained in the housing interior 44 can pass through the perforations 48 to the desiccant 70 and be bound thereto. As a drying agent 70 is particularly suitable a molecular sieve. Suitable materials are also a natural or synthetic zeolite or a silica gel.

The hermetically sealed housing 22 can optionally also be filled with an inert gas, for example nitrogen or argon, in order to suppress permanently oxidizing processes in the housing interior 44.

As already indicated above, as can be seen in FIGS. 2 to 4, a plurality of radiation elements 24 can also be arranged in a radiation element group 76. The radiation elements 24 of a radiation element group 76 are packed as densely as possible in order to define a total surface similar to the surface to be illuminated by the luminaire. In order to obtain an optimal illumination, a plurality of radiation element groups 76 may additionally be arranged in the form of lines, rasters or matrixes, in order to improve the illumination of the road 12 or of the sidewalk 14. The secondary optics 64 is then either designed such that the radiation 26 radiated by the radiation element groups 76 is superimposed on all the radiation element groups 76 or is not guided in an overlapping manner.

To power the radiating elements 24, one or more electrically conductive connections are provided through the housing 22, which are electrically connected to the circuit board 34 or directly to the radiating elements 24. The electrically conductive connections are ser- and water vapor tight through the housing 22. For this purpose, corresponding not shown in the figures openings, for example, on the housing bottom 36 analogous to the connection of the spacer 40 with the radiation outlet element 28 and the housing bottom 36 bonded with a water and water vapor-tight adhesive 50 and additionally provided with a cover 58, the Cover 58 described above corresponds to the spacers 40.

The radiating elements 24 preferably emit "white light". This can be produced, for example, by the fact that the radiation 26 generated by an LED 32 optically excites a luminescence element 78 which, as a result of the optical excitation, emits electromagnetic radiation having a wavelength which is greater than the wavelength of the radiation 26 generated by the LED 32. The luminescence element is preferably designed in the form of a fluorescent and / or phosphorescent element and surrounds the LED 32 at least partially in the form of a layer or in the form of a coating. Preferably, LEDs 32 are used which emit electromagnetic radiation having a wavelength in a wavelength range of 300 nm to 800 nm, in particular LEDs 32, which generate blue light in a wavelength range of 410 nm to 510 nm, which is then emitted by a luminescence element 78 in FIG the human eye is converted substantially yellow radiation, so that superimposing the spectra of the LED and the luminescent elements 78 produces an overall sense impression for a person of "white light".

In order to ensure a particularly high luminous efficacy of the lighting device 20, a transmission of the radiation outlet element 28 is greater than 75%, preferably greater than 95%. Furthermore, the radiation exit element 28 is made of a material which transmits electromagnetic radiation in a wavelength range preferably from 300 nm to 800 nm. The lighting device 20 described in connection with the figures is outstandingly suitable for continuous outdoor use, highly efficient and ensures a long service life, which can be 20 years and longer.

Claims

claims

Lighting device (20) for lighting purposes, comprising a housing (22) in which at least one radiation element (24) is arranged for generating and emitting electromagnetic radiation (26), which housing (22) at least one radiation outlet element (28) which at least a portion of the radiation (26) from the housing (22) can escape to the outside, characterized in that the housing (22) is completely closed, water and water vapor-tight.

2. Lighting device according to claim 1, characterized in that the at least one radiation element comprises a by electromagnetic excitation electromagnetic radiation (26) generating and emitting LED (32) (Light Emitting Diode) comprises or is.

3. Lighting device according to claim 2, characterized in that the at least one radiation element (24) comprises at least one luminescent element (78) which is optically excited by the radiation generated by the LED (32) (26) and due to the optical excitation electromagnetic radiation emitted at a wavelength which is greater than the wavelength of the radiation (26) generated by the LED (32).

4. Lighting device according to claim 3, characterized in that the at least one luminescent element (78) is a fluorescent and / or a phosphorescent element which fluoresces due to the optical excitation and / or phosphorescent.

5. Lighting device according to claim 3 or 4, characterized in that the at least one luminescent element (78) in the form of a LED (32) at least partially surrounding layer or coating is formed.

6. Lighting device according to one of the preceding claims, characterized in that the housing (22) is designed unöffenbar.

7. Lighting device according to claim 6, characterized in that the housing (22) is designed such that it is destroyed when opening or irreparably damaged.

8. Lighting device according to one of the preceding claims, characterized in that the housing (22) defines a housing interior (44) having a housing interior volume which is greater than one of the at least one radiation element (24) defined radiation element volume.

9. Lighting device according to one of the preceding claims, characterized by a secondary optics (64) for the defined emission of the at least one radiation element (24) emitted electromagnetic radiation (26).

10. Lighting device according to claim 9, characterized in that the secondary optics (64) is designed for the defined emission of the at least one radiation element (24) emitted electromagnetic radiation (26) through the at least one radiation outlet element (28) therethrough.

11. Lighting device according to claim 9 or 10, characterized in that the secondary optics (64) at least one optical component (66) for deflecting and / or focusing and / or diverging of the comprises at least one radiation element (24) generated radiation (26).

12. Lighting device according to claim 11, characterized in that the at least one optical component (66) is a lens or a mirror (68).

13. Lighting device according to one of claims 9 to 12, characterized in that the secondary optics (64) is adapted to generate a rectangular cross-section beam of the generated radiation (26).

14. Lighting device according to one of the preceding claims, characterized in that the at least one LED (32) emits electromagnetic radiation (26) having a wavelength in a wavelength range of 300 nm to 800 nm.

15. Lighting device according to claim 14, characterized in that the at least one LED (32) emits electromagnetic radiation (26) having a wavelength in a wavelength range of 410 nm to 510 nm.

16. Lighting device according to one of the preceding claims, characterized in that a housing wall of the housing (22) is formed wholly or partly by the at least one radiation outlet element (28).

17. Lighting device according to one of the preceding claims, characterized in that the at least one radiation exit element (28) transmits electromagnetic radiation (26) in a wavelength range of 300 nm to 800 nm.

18. Lighting device according to claim 17, characterized in that the at least one radiation outlet element (28) electromagnetic Radiation (26) in a wavelength range of 410 nm to 750 nm transmitted.

19. Lighting device according to one of the preceding claims, characterized in that the at least one radiation outlet element (28) has a transmission of at least 75%.

20. Lighting device according to claim 19, characterized in that the transmission is at least 95%.

21. Lighting device according to one of the preceding claims, characterized in that the at least one radiation outlet element (28) in the form of an electromagnetic radiation (26) transmitting disc (28) is formed.

22. Lighting device according to claim 21, characterized in that the disc (28) is formed of glass or a plastic.

23. Lighting device according to one of the preceding claims, characterized in that the housing (22) from at least two housing parts (28, 36, 40) is formed, which are connected together by gluing.

24. Lighting device according to claim 23, characterized in that the at least two housing parts (28, 36, 40) only by gluing (50) are interconnected.

25. Lighting device according to claim 23 or 24, characterized in that the at least two housing parts (28, 36, 40) with an adhesive (50) are interconnected.

26. Lighting device according to claim 25, characterized in that the adhesive (50) is impermeable to water and water vapor.

27. Lighting device according to claim 25 or 26, characterized in that the adhesive (50) is permanently elastic.

28. Lighting device according to one of claims 25 to 27, characterized in that the adhesive (50) is UV-resistant.

29. Lighting device according to one of claims 25 to 28, characterized in that the adhesive (50) is a butyl adhesive, in particular Iso butylene.

30. Lighting device according to one of claims 25 to 29, characterized in that the adhesive (50) forms part of an adhesive tape.

31. Lighting device according to one of the preceding claims, characterized in that the housing (22) comprises a housing bottom (36) or a housing pan, which are directly or indirectly connected to the radiation outlet element (28).

32. Lighting device according to claim 31, characterized in that the housing (22) comprises at least one spacer element (40) which is arranged between the housing bottom (36) or the housing trough on the one hand and the radiation outlet element (28) on the other hand for holding the housing bottom (36 ) or the housing pan on the one hand and the radiation outlet element (28) on the other hand at a defined distance from each other.

33. Lighting device according to claim 32, characterized in that the at least one spacer element (40) surrounds a housing interior (44) defined by the housing (22) annularly or circumferentially.

34. Lighting device according to claim 32 or 33, characterized in that the at least one spacer element (40) forms at least a part of at least one housing wall (38) of the housing (22).

35. Lighting device according to one of claims 32 to 34, characterized in that the at least one spacer element (42) is hollow or partially hollow.

36. Lighting device according to claim 35, characterized in that the at least one hollow or partially hollow spacer (40) defines at least one spacer interior (42) and at least one perforation (48) for establishing a fluid connection between the housing interior (44) and the at least a spacer interior (42).

37. Lighting device according to claim 36, characterized in that the at least one hollow or partially hollow spacer element (40) has a plurality of perforations (48).

38. Lighting device according to one of the preceding claims, characterized in that the housing (22) contains a drying agent (70) in the interior.

39. Lighting device according to claim 38, characterized in that the drying agent in at least one desiccant container (72) or held on a desiccant carrier (74) is held.

40. Lighting device according to claim 39, characterized in that the at least one hollow or partially hollow spacer element (40) forms the at least one desiccant container (72).

41. Lighting device according to one of claims 38 to 40, characterized in that the drying means (70) is or comprises a molecular sieve.

42. Lighting device according to one of claims 38 to 41, characterized in that the drying agent (70) comprises or is a natural or synthetic zeolite and / or a silica gel.

43. Lighting device according to one of claims 38 to 42, characterized in that the drying means (70) is powder-shaped, rod-shaped or bead-shaped.

44. Lighting device according to one of claims 38 to 43, characterized in that the drying means (70) is designed for adsorbing in the housing interior (44) contained water and / or water vapor.

45. Lighting device according to one of the preceding claims, characterized in that the at least one radiation element (24) on a circuit board (34) or a housing bottom (36) or a housing trough of the housing (22) is arranged.

46. Lighting device according to claim 45, characterized in that the circuit board (34) is connected to the housing bottom (36) or the housing pan.

47. Lighting device according to one of the preceding claims, characterized in that on the housing (22) at least one mechanical connecting element (62) is provided for connecting the lighting device (20) with a lamp housing (18) of a lamp (10).

48. Lighting device according to claim 47, characterized in that the at least one connecting element (62) in the form of a threaded pin or a blind hole (62) is formed.

49. Lighting device according to one of claims 32 to 48, characterized in that the at least one spacer element (40) is arranged such that it neither completely nor partially forms an outer surface of the housing (22).

50. Lighting device according to one of claims 32 to 49, characterized by a housing interior (44) facing away, the at least one spacer element (40) at least partially covering cover (50).

51. lighting device according to claim 50, characterized in that the cover (58) the at least one spacer element (40) from the housing interior (44) facing away completely covered.

52. Lighting device according to claim 50 or 51, characterized in that the cover (50) in the form of an at least one-sided coating of the spacer element (40) is formed.

53. Lighting device according to one of claims 50 to 52, characterized in that the cover (50) is elastic.

54. Lighting device according to one of claims 50 to 53, characterized in that the cover (50) covers at least a portion of the splices (60) between individual parts of the housing (22).

55. Lighting device according to one of claims 50 to 54, characterized in that the cover (58) contains silicone and / or polyurethane and / or polysulfide or is.

56. Lighting device according to one of the preceding claims, characterized by two or more radiation elements (24).

57. Lighting device according to claim 56, characterized in that the radiation elements (24) individually and / or a plurality of radiation elements (24) are arranged together in one or more radiation element groups (76).

58. Lighting device according to one of the preceding claims, characterized by one or more electrically conductive connections through the housing (22) therethrough for connecting the at least one radiation element (24) with an electrical power supply.

59. Lighting device according to claim 58, characterized in that the one or more electrically conductive compounds are water and steam-tightly guided through the housing.

60. Lighting device according to one of the preceding claims, characterized in that at least a part of the housing (22) is made of a metal.

61. Lighting device according to one of claims 8 to 60, characterized in that the housing interior (44) is filled with a protective gas.

62. Lighting device according to claim 61, characterized in that the protective gas is an inert gas, in particular nitrogen and / or argon.

63. luminaire (10) having a luminaire housing (18) and a lamp housing (18) arranged lighting device (20) for lighting purposes, which lighting device comprises a housing (22) in which at least one radiation element (24) is arranged for generating and emitting electromagnetic radiation (26), which housing (22) at least one radiation outlet element (28) through which at least a portion of the radiation (26) from the housing (22) can escape to the outside, characterized in that the housing (22) is completely closed, water and water vapor-tight ,

64. Luminaire according to claim 63, characterized in that the lamp (10) in the form of an outdoor light (10) is formed.

65. Luminaire according to claim 63 or 64, characterized in that the lamp (10) in the form of a street or pavement lamp (10) is formed.

66. Use of a lighting device (20) according to any one of claims 1 to 62 outdoors or outside closed rooms.