LIGHTING AND USE

Abstract

Light source (1) with a radiation emission surface (2), wherein the light source (1) comprises: - a housing part (3) with a receptacle (9), - an organic optoelectronic device (5) arranged in the receptacle (9), and - a cover part (4) connected to the housing part (3), wherein the organic optoelectronic component (5) is held between the cover part (4) and the housing part (3), wherein the light source (1) has one or a plurality of external electrical connection parts (7, 8), and wherein the organic optoelectronic device (5) has a plurality of electrical contacts (21, 22) of the same polarity, wherein the contacts (21, 22) of the same polarity are connected via a connecting conductor of a conductor part (20) to the common external electrical connection part (7, 8) or to one of the plurality of external electrical connection parts (7, 8), wherein the cover part (4) is recessed in a radiation transmission area and wherein the housing part (3) is recessed in an area that overlaps with the radiation transmission area.

Description

[0001] A light source and the use of an element for a light source are specified.

[0002] Light sources are of great importance, especially in the context of general lighting, for example for fitting luminaires, such as lamps, with a light source as a radiation-generating element.

[0003] Publication DE 10 2010 014 307 A1 discloses a lighting device.

[0004] Document US 2010 / 0076527 A1 discloses a user-configurable light-emitting mosaic device.

[0005] Publication DE 20 2010 008 324 A1 discloses an organic lighting device and illumination device.

[0006] The publication DE 10 2010 038 252 A1 discloses a socket for a luminaire with an OLED light source.

[0007] One task to be solved is to specify a new light source, in particular an improved light source. Furthermore, an element for a light source should be specified which offers particular advantages when used in the light source.

[0008] These tasks are solved, among other things, by the subject matter of the independent patent claims. Further advantageous embodiments are the subject matter of the dependent claims.

[0009] Apart from the claimed teachings, the present disclosure may contain further teachings that also solve one of the aforementioned problems. The present disclosure is therefore not to be regarded as limited to the subject matter of the claims.

[0010] A light source with a radiation emission surface is specified. Radiation generated in the light source, preferably visible, can exit the light source through the radiation emission surface.

[0011] The light source comprises a housing. The housing has a receptacle. A radiation-generating element for the light source can be arranged in the receptacle. The receptacle can be rimmed, particularly around its perimeter. Advantageously, the housing can protect internal components of the light source, such as electrical contacts of the radiation-generating element, from harmful external influences. The housing can form at least part of the outer surface of the light source.

[0012] The light source has a cover. The cover is connected to the housing, for example, either detachably or permanently. The cover can form at least part of the outer surface of the light source.

[0013] The light source comprises a radiation-emitting or optoelectronic component that is suitably designed to generate radiation. The component may be tile-shaped. The component is an organic component, such as an organic light-emitting diode (OLED). The organic component preferably comprises organic functional material that, when supplied with appropriate electrical power, generates electromagnetic radiation, preferably in the visible spectral range. The component may have a radiation-emitting surface. This surface may form the radiation-emitting surface of the light source. Thus, the radiation-emitting surface of the component may be an outer surface of the light source.

[0014] The component is arranged in the receptacle of the housing part. The component may be inserted into the receptacle. The receptacle of the housing part may be shaped according to the component. The receptacle may be shaped such that, when the component is arranged in the receptacle, relative movement, in particular relative rotation, between the housing part and the component is limited or prevented. This can be achieved by appropriately shaping the receptacle in accordance with the shape of the component, for example, by corresponding edges in a border defining the receptacle.

[0015] The component is held between the cover and the housing. If the cover is connected to the housing, a retaining space can be formed between them, in which part of the component can be positioned. For example, a retaining groove can be formed between the housing and the cover. The retaining space can extend around the entire circumference of the component. If the cover is detachably connected to the housing, the cover can be removed from the housing, and the component can be taken out of the housing, if necessary. A defective component can thus be easily replaced.

[0016] The cover plate can conceal electrical and / or mechanical elements of the light source, such as fasteners or electrical wiring, that would otherwise be exposed in the recess. The covered elements are thus protected from harmful external influences, such as mechanical stress. Furthermore, electrical and mechanical elements are often aesthetically unappealing. The cover plate therefore enhances the aesthetic appeal of the light source. The cover plate can cover the entire recess, except for the light-emitting surface of the component, and preferably also a raised edge of the housing surrounding the recess. The cover plate can be flush with the housing on the outside.

[0017] According to at least one embodiment, the light source has a maximum thickness of 8 mm or less. By means of the mounting of the component between the cover part and the housing part, a particularly flat light source can be provided. The light source can, in particular, have a thickness that is one-quarter or less, preferably one-fifth or less, such as one-sixth or less, of a lateral dimension, for example, the diameter, of the radiation emission surface of the light source. Accordingly, the light source can be implemented as a planar light source.

[0018] The cover plate has a recess in a radiation transmission area. This allows the cover plate to be selected independently of its optical properties with regard to the radiation generated by the light source. Within this radiation transmission area, radiation can pass through the cover plate unhindered. The cover plate may have a central recess. The cover plate may have a ring-shaped design when viewed from above.

[0019] The housing part is recessed. The housing part may be recessed in the area of ​​the mounting. The housing part is expediently recessed in an area that overlaps with the radiation transmission area of ​​the cover part, or is even completely covered by it. If both the housing part and the cover part are recessed, a recess may be visible both from the front of the light source with the radiation emission surface and from the rear, where, for example, the back of the radiation-emitting component or an element connected to it may be exposed. The external appearance of the light source, especially when switched off, can thus be partly determined by the component or elements connected to it.

[0020] According to at least one embodiment, the housing part, particularly in the area of ​​the receiver, is free of recesses. If the housing part is not recessed, it can obscure other elements that are less aesthetically pleasing than the housing part itself.

[0021] According to at least one embodiment, the cover part is designed to be electrically conductive.

[0022] According to another embodiment, the cover part is designed to be thermally conductive. The cover part can therefore be used to dissipate waste heat from the component.

[0023] According to at least one embodiment, the cover part is magnetic, in particular ferromagnetic. The cover part can be detachably attached to the housing part by magnetic forces.

[0024] According to at least one embodiment, the housing part is designed to be electrically insulating.

[0025] According to at least one embodiment, the housing part has one or more connecting means for connecting to, and in particular securing, the cover part. The respective connecting means can be designed for a detachable or permanent connection. The respective connecting means is preferably designed for a mechanically stable connection. If the connection, in particular a detachable one, is achieved via magnetic forces, it can be advantageous to provide one or more magnets as connecting means. These magnets can be distributed around the perimeter of the housing part. For a permanent connection, corresponding locking devices can be provided on the cover part and the housing part as connecting means. The locking connection formed between the locking devices is then a permanent connection, i.e., a connection that cannot be broken without destroying one of the connecting means.

[0026] The light source has one or more, for example two, external electrical connection points. Each connection point can be used for electrically connecting the light source to an external power source. Electrical power can be supplied to the component via the connection point. The connection point can also be used for connecting to a DC voltage source.

[0027] The respective connection element can be held within the housing and accessible from the outside. The connection element is advantageously electrically connected to an electrical contact of the component. The component can have more contacts than the light source has external electrical connections. In particular, the component can have more contacts of one polarity – anode or cathode – than the light source has external connections for that polarity. Via suitable electrical connections within the light source, two electrical contacts of the same polarity can be led to a common connection element and electrically connected to it.

[0028] According to at least one embodiment, the respective external electrical connection part is designed as a connector for an electrical plug connection. One of the connection parts can be designed as a male connector, for example, a plug, and the other as a female connector, for example, a socket, of an electrical plug connection. Connectors are familiar even to the uninformed user, such as the end consumer, and can be operated by them in a simple manner. Accordingly, connectors are particularly suitable for the electrically conductive connection of the light source to the luminaire. The respective connection part can, for example, be designed as a connector for a jack plug connection. The respective connector for the plug connection can be designed as a single-pole connector. In this case, the respective connection part is preferably designed for one polarity.However, it is also conceivable to combine two polarities in one connector, for example in a two-pole jack plug. Two different connectors for different polarities offer the possibility of electrically and preferably also mechanically connecting multiple light sources to each other via the connectors before the then unused terminals are connected to a power source.

[0029] According to at least one embodiment, two external electrical connection parts are arranged at two opposite, preferably diametrically opposed, positions when viewed from above the radiation emission surface of the light source.

[0030] According to at least one embodiment, two connecting parts are aligned along an axis that can extend through both connecting parts. In particular, the insertion direction for forming a plug connection with the respective connecting part can extend along this axis. Both connecting parts can lie on the axis. If the connecting parts are aligned along an axis, the light source installed in the luminaire, whose two connecting parts are connected to terminals of the luminaire, can still be moved, in particular rotated, about this axis. The connecting parts can thus form part of a rotary bearing for the light source in the luminaire. The elongated connecting parts for a jack plug connection are particularly suitable for alignment along the axis. Since jack plugs do not have a rotation lock, rotation is also ensured.

[0031] According to at least one embodiment, the light source has a holding device. The holding device and a connecting element can be aligned along a common axis. This axis can extend through both the holding device and the connecting element. Viewed from above the light-emitting surface of the light source, the connecting element and the holding device can be arranged in two opposite, preferably diametrically opposed, positions. The connecting element can be designed as a two-pole connector for a plug connection, for example, a jack connector, such as a plug or socket. The holding device can be designed for connection with a retaining element of a luminaire to hold the light source in the luminaire.This connection, which is preferably mechanically stable, allows a relative rotation between the holding element and the holding device when they are connected to each other.

[0032] The radiation-emitting component has a plurality of electrical contacts of the same polarity. Furthermore, the component preferably has at least two contacts of different polarities.

[0033] The light source comprises a conductor section. This conductor section has at least one or more connecting conductors. Each connecting conductor links a contact of the component to an external electrical connection point of the light source. Several contacts of the same polarity are connected via connecting conductors of the conductor section to a common external electrical connection point of the light source. This allows contacts of the same polarity to be connected to a common connection point. The number of connections required for electrical contacting is thus advantageously reduced compared to a light source where each contact must be connected externally separately. The connecting conductors of the conductor section for different polarities are expediently electrically isolated from each other to prevent short circuits.

[0034] According to at least one embodiment, the conductor part is mechanically connected to the component via a bonding layer. The bonding layer is, for example, electrically insulating.

[0035] According to at least one embodiment, the conductor part is electrically connected to the component via an electrically conductive layer, preferably an anisotropically electrically conductive layer. The aforementioned connecting layer can be different from the electrically conductive layer.

[0036] According to at least one embodiment, the respective external electrical connection part is electrically conductive and preferably mechanically connected to the conductor part, in particular via a solder joint. A solder joint is characterized by particularly high mechanical stability.

[0037] According to at least one embodiment, the conductor part is a flexible conductor part, such as a flexible printed circuit board (PCB), or comprises one. A flexible PCB, particularly one with a film as a substrate for the PCB conductors, is especially suitable for forming thin light sources.

[0038] According to at least one embodiment, the cover part has one or more fixing elements. Each fixing element is preferably designed and arranged to secure one of the connection parts against movement relative to the housing part, particularly when the cover part is connected to the housing part. The fixing element can be designed as a projection of the cover part. The fixing element can be located further from an edge of the housing part than a portion of a connection part that is arranged between the fixing element and the housing part. Accordingly, this connection part can be held between the fixing element and the housing part. The fixing element advantageously prevents the connection part from slipping into the receptacle of the housing part when connected to a luminaire, for example, by plugging it in. Preferably, each connection part is associated with a fixing element.

[0039] According to at least one embodiment, the cover part has one or more thermal contact elements. The cover part can be thermally connected to the component via the respective thermal contact element. This allows waste heat from the component to be transferred to the cover part and dissipated to the environment via the cover part. This can increase the component's service life.

[0040] According to at least one embodiment, a thermally conductive element, for example a thermally conductive film, is arranged on the component and thermally connected to it. The thermally conductive element can have a thermal contact surface. Viewed from above, the thermal contact surface can be located next to the radiation emission surface. The thermal contact surface can be thermally connected to a thermal contact element of the cover part. The thermally conductive element can have a large surface area and can completely cover the component. The heat can be distributed homogeneously across the surface of the component via the thermally conductive element. Temperature fluctuations across the component, viewed from above and potentially causing fluctuations in the emission-side luminance distribution, can thus be reduced or avoided.

[0041] According to at least one embodiment, the cover part and / or the housing part is opaque.

[0042] According to at least one embodiment, the use of at least one connecting element for a jack connector is specified. The connecting element is preferably used as an external electrical connection for a light source with a, preferably organic, optoelectronic component. As explained above, a jack connector offers particular advantages, especially with planar components such as OLEDs.

[0043] According to a preferred embodiment, a light source with a radiation emission surface is specified, wherein the light source comprises: - a housing part with a receptacle, - at least one organic optoelectronic component arranged in the recording, and - at least a cover part that is connected to the housing part, wherein the component is held between the cover part and the housing part.

[0044] Further advantages, beneficial designs and expediencies will result from the following description of the exemplary embodiments in conjunction with the figures. Fig. 1 and Fig. Figure 2 shows various schematic oblique views of a light source according to an exemplary embodiment. Fig. 3 and Fig. Figure 4 shows various schematic oblique views of a housing part for the light source. Fig. 5 and Fig. Figure 6 shows various schematic oblique views of a cover part for the light source according to the embodiment. Fig. Figure 7 shows a module for the light source with an optoelectronic component according to the exemplary embodiment. Fig. 8 and Fig. Figure 9 shows various schematic oblique views of the component for the module according to the embodiment. Fig. Figure 10 shows a conductor part for the module and electrical connection parts for the module for attachment to the conductor part according to the embodiment. Fig. Figure 11 shows a schematic top view of a heat conducting element for the module according to the embodiment. Fig. Figure 12 shows, using a schematic sectional view of a part of the light source, the thermal connection between the cover part and the component according to the exemplary embodiment. Fig. Figure 13 shows, using a schematic sectional view of a part of the light source, the fixing of an electrical connection part in the light source according to the exemplary embodiment. Fig. Figure 14 shows a top view of the light source with the cover removed, according to the embodiment. Fig. Figure 15 shows a section of the cover part according to the exemplary embodiment. Fig. Figure 16 shows an embodiment of a permanent connection between the housing part and the cover part. Fig. Figures 17 to 19 show a variation of the light source according to the embodiment from the Fig. 1 to 16.

[0045] Identical, similar, and similarly effective elements in the figures are provided with the same reference symbols.

[0046] In the Fig. 1 and Fig. 2 is a light source 1 shown schematically. Fig. Figure 1 shows an oblique view of one side of the light source 1 with a radiation emission surface 2. This side is also referred to herein as the front. Fig. Figure 2 shows a schematic oblique view of a side of the light source 1 facing away from the radiation emission surface 2, which is also referred to herein as the back.

[0047] The light source 1 comprises a housing part 3 and a cover part 4. Furthermore, the light source 1 includes an optoelectronic component 5. The component 5 is preferably designed as an organic electroluminescent component, for example as an organic light-emitting diode (OLED). The organic electroluminescent component expediently comprises organic functional material which, when subjected to appropriate electrical power, emits radiation, preferably radiation in the visible spectral range.

[0048] The cover 4 advantageously covers, particularly on its front side, the elements of the light source 1 arranged within the housing part 3, advantageously excluding the radiation emission surface 2, which may be formed by the radiation emission surface of the component 5. The cover 4 may, when viewed from above, have a central recess, for example, annular in shape. The cross-section of the cover 4 may taper towards the recess. For example, the cover 4 may be rounded towards the recess. This can improve the overall aesthetic appearance. The cross-section of the cover 4 may also taper outwards (not explicitly shown).

[0049] The cross-section of the housing part 3 can taper outwards. This can create a thinner overall impression of the light source 1. The housing part 3, like the cover part 4, can be recessed and, in particular, ring-shaped when viewed from above. Preferably, the recess of the cover part 4 completely covers that of the housing part 3. The rear recess can therefore be smaller than the front recess. Even when the light is switched off, the size ratio indicates to the user that radiation passes through the larger of the two recesses during operation. This prevents unwanted glare due to an incorrect orientation of the radiation emission surface. Alternatively, the two recesses can be identical when viewed from above.

[0050] Towards the recess of the housing part 3, its cross-section can taper, with the increase in curvature towards the recess preferably being greater than that towards the outer edge of the cover part 4. A thinner overall appearance for the light source 1 can be achieved by a profile of the housing part 3 and preferably of the cover part 4 that is rounded towards the outer edge.

[0051] The light source 1 can have a maximum thickness of 8 mm or less, for example, approximately 6 mm. The aforementioned shaping of the housing part 3 and preferably the cover part 4 may give the user the impression that the light source is even thinner.

[0052] The cover part 4 is preferably substantially flat on its outer surface. One or more projections 6 may be provided on the outer surface of the housing part 3. The projections 6 are preferably aligned along a common axis that may extend through these elements. A projection 6 may be provided in a region of the outer surface where a connecting part (see below) is arranged in the housing part 3 and extends out of the interior of the housing part.

[0053] The light source 1 further comprises at least one external electrical connection 7. In the illustrated embodiment, the light source comprises two electrical connection assemblies. In addition to the connection 7, a further connection 8 is provided. The external electrical connection assemblies 7 and 8 are preferably designed for different polarities. One of them can be designed as an anode connection and the other as a cathode connection for contacting electrical contacts of the component 5. Electrical power can be supplied to the component 5 via the respective electrical connection assemblies 7 and 8. The respective connection assemblies 7 and 8 can be designed for connection to a DC voltage source.

[0054] The respective external electrical connection part 7 or 8 is designed as a connector for an electrical plug connection. The respective connection part can be designed as a standard plug connector. In this case, connection part 7 is designed as a male part for a plug connection, while connection part 8 is designed as a female part for a plug connection 8. Advantageously, the additional connection part 8 is designed such that it could form a plug connection with another connection part of a different light source, which is shaped according to connection part 7. This facilitates the series connection of a plurality of the described light sources 1.

[0055] The external electrical connection parts 7 and 8 shown are designed for a jack connector, with connection part 7 being a plug and connection part 8 a socket. A jack connector has the advantage that, when the jack connector is used, the light source can still be rotated relative to the elements contacted by the connector.

[0056] Preferably, the connecting parts 7 and 8 are aligned on a single axis to facilitate rotation of the light source when installed. The connecting parts 7 and 8 can be arranged offset from each other by 180°. In other words, the connecting parts can be located at diametrically opposite positions on the light source. In the illustrated embodiment, the light source 1 has a substantially circular shape when viewed from above, apart from the connecting parts 7 and 8. If the light source does not have a substantially circular shape, arranging the connecting parts 7 and 8 at diametrically opposite positions in the area of ​​the light source with the largest diameter can be advantageous to facilitate rotation of the light source when installed.As an alternative to the representation with two electrical connection parts 7 and 8, only one electrical connection part 7 may be provided. More than two connection parts may also be provided.

[0057] In the illustrated embodiment, the connection parts 7 and 8 are single-pole, which is sufficient for contacting the two poles of a diode, such as an OLED. If connection parts 7 and 8 are omitted, the remaining connection part would have to be multi-pole, e.g., two-pole.

[0058] The light source 1 can be designed as a planar light source. The thickness of the light source is preferably significantly smaller than the maximum or minimum lateral dimension of the radiation emission surface 2 of the light source 1. The lateral dimension can be the diameter of the radiation emission surface, its length, or its width. For example, the thickness is less than one-quarter, one-fifth, or even one-sixth of the maximum or minimum lateral dimension.

[0059] The cover part 4 is connected to the housing part 3. The parts are connected in such a way that the component 5 is mechanically held securely between the housing part 3 and the cover part 4. A retaining space, for example a retaining groove, can be formed between the housing part 3 and the cover part 4, in which a portion of the component 5 is arranged, for example an edge region of the component 5 that runs alongside the radiation emission surface. The retaining space is preferably provided around the entire circumference.

[0060] The cover part 4 and the housing part 3 are preferably mechanically stable, for example, self-supporting. The cover part 4 and the housing part 3 can therefore combine to form a housing for the component of the light source 1, which protects sensitive elements, such as electrical conductors, from harmful external influences. At the same time, the housing thus formed can determine the overall aesthetic appearance of the light source. In particular, the housing can be designed to be more aesthetically pleasing than the component 5 itself.

[0061] The Fig. 3 and Fig. Figure 4 shows the housing part 3 of the light source 1 in oblique views. The recess in the housing part allows waste heat from the component to be dissipated into the environment without having to conduct it through the material of the housing part 3. This reduces the thermal stress on the housing part 3.

[0062] The housing part 3 has a receptacle 9 designed to receive the component 5. The receptacle 9 advantageously has a bearing surface 10 for supporting the component 5. The bearing surface 10 can extend around the recess of the housing part. The housing part 3 also has a rim or frame 11. The rim 11 extends beyond the bearing surface 10. Preferably, the rim 11 projects beyond the radiation emission surface of the component 5 inserted into the receptacle 9. The rim 11 defines the outer boundary of the bearing surface 10. The rim 11 can define the receptacle 9 laterally and, in particular, circumferentially. The receptacle 9 has a shape adapted to the shape of the component 5. In particular, the component 5, and preferably also the receptacle, can have an angular shape, for example, a polygonal shape in plan view, such as a substantially hexagonal or octagonal shape (see also the section on the component). Fig. 8 and Fig. 9) The receptacle 9 can have corresponding edges so that the component 5 inserted into the receptacle 9 is secured against rotation relative to the housing part 3. Between the support surface 10 and an inner surface of the cover part 4, the aforementioned retaining space can be formed when the cover part is connected to the housing part 3.

[0063] From the support surface 10, feedthroughs for the connection parts 7 and 8 extend outwards. Each feedthrough 12 penetrates the edge 11. A connection part 7 or 8 can be guided outwards from the receptacle 9 through each feedthrough. The housing part 3 may have a recess in the area of ​​the feedthrough. Each feedthrough 12 is recessed relative to the support surface 10. Each feedthrough 12 can be connected to the support surface 10, for example, via an angled connecting section. A recessed arrangement of the feedthrough provides space for relatively bulky elements, such as connectors for the connection parts.

[0064] The receptacle 9 further comprises at least one, or in the exemplary embodiment two, protrusions 13, which are preferably directed outwards, for example radially outwards. The respective protrusion is preferably connected to the support surface 10. The position of the respective protrusion 13 is preferably offset relative to that of the respective through-hole 12, for example by 90°.

[0065] With the component 5 inserted into the receptacle, the respective recess 13 is preferably not occupied by the component. Instead, a heat-conducting element (compare the heat-conducting element 19 below) expediently projects into the recess and is partially accessible there when the cover part 4 is not connected to the housing part 3.

[0066] The housing part 3 is preferably made of electrically insulating material. The housing part can contain a plastic, for example polycarbonate (PC), acrylonitrile butadiene styrene (ABS) or polybutylene terephthalate (PBT).

[0067] In one or more areas, the transition between the support surface 10 and the edge 11 is provided with an additional step 14. The respective step is preferably arranged in an area of ​​the receptacle where, when the component 5 is inserted, an electrical contact of the component is located (see the description of the component below). The respective contact can extend over the step 14 when the component is arranged in the receptacle 9.

[0068] The rim 11 is advantageously designed to form a mechanically stable connection between the housing part 3 and the cover part 4. For this purpose, the rim 11 can be provided with connecting elements 15. The connecting elements 15 can be distributed around the circumference of the rim 11. This facilitates a uniformly stable mechanical fastening around the circumference.

[0069] Advantageously, the cover part 4 is detachably connected to the housing part 3. This facilitates the replacement of a component 5, which becomes necessary in the event of a defective component 5. The connecting means 15 can, for example, comprise magnets, such as permanent magnets, for a detachable connection. These are preferably embedded in the edge 11 of the housing part 3 to avoid unnecessarily increasing the thickness of the light source. The cover part 4 contains, preferably around its entire circumference, magnetic material, in particular ferromagnetic material, or consists of such material. This simplifies the attachment to the housing part 3 by means of magnetic connecting means 15.

[0070] The Fig. 5 and Fig. Figures 6 each show an oblique view of the cover part 4, once from the front ( Fig. 5), which forms part of the outer surface of the light source 1, and once from the back ( Fig. 6), which is located inside the light source.

[0071] The cover part 4 has, particularly on its inner side, one or more thermal contact elements 16. Each contact element can be designed as a projection. The respective contact element 16 can project from a bearing surface of the cover part 4, with which the cover part rests on the edge 11 of the housing part when it is connected to the latter. Two thermal contact elements 16 are preferably arranged at diametrically opposed positions on the cover part 4. When the cover part 4 is placed on the housing part 3 and connected to it, the respective thermal contact element 16 is preferably arranged in the area of ​​a bulge 13. The respective thermal contact element is thermally connected to the component, for example via a heat-conducting element, when the housing part is connected to the cover part. Heat can be dissipated from the component and transferred to the cover part 4 via the respective thermal contact element.The heat is then released into the surroundings via the cover.

[0072] Preferably, the cover part comprises or consists of a material that is ferromagnetic and / or has good thermal conductivity. A material that is both thermally conductive and ferromagnetic is, for example, iron or low-alloy steel.

[0073] The cover part 4 has one or more fixing elements 17. Each fixing element 17 is electrically insulating. Each fixing element 17 may be designed as a projection. Each fixing element 17 may project from a bearing surface of the cover part 4, with which the cover part rests on the edge 11 of the housing part 3 when connected to it. Each fixing element 17 is advantageously arranged and designed to prevent movement of one of the connecting parts 7 or 8 relative to the housing part, in particular into the receptacle 9, when the cover part 4 is connected to the housing part 3. For example, a connecting part 7 or 8 can be held by means of the fixing element 17 on one side and a region of the housing part on the other side, for example in a clamping fit. The fixing elements 17 are preferably provided in diametrically opposed positions.

[0074] If the cover part 4 is connected to the housing part 3, the respective fixing element is advantageously arranged in the area of ​​the respective feedthrough 12. Compared to the respective fixing element 17, the respective thermal contact element 16 is preferably designed with a larger surface area. A larger surface area is of considerable advantage for the thermal connection. Mechanical stabilization of the respective connection part can also be achieved by a smaller fixing element.

[0075] Fig. Figure 7 shows a module 18 comprising component 5 and one or more additional elements. The module can be prefabricated with all the elements shown and inserted as a prefabricated module into the receptacle 9 of the housing part 3 before the cover part 4 is connected to the housing part.

[0076] In addition to the component, the module 18 can include a thermal conductivity element 19. The module 18 can also include a conductor section 20. The module 18 further includes the external electrical connection parts 7 and 8. The conductor section 20 can be arranged between the thermal conductivity element 19 and the component 5. The external electrical connection parts 7 and 8 are expediently attached to the conductor section 20 and electrically connected to electrical contacts of the component 5 via connecting conductors, which are provided on the conductor section but not explicitly shown.

[0077] The Fig. Figures 8 to 11 show schematic representations of the individual elements of Module 18.

[0078] Component 5 is in the Fig. 8 and Fig. Figure 9 shows a schematic representation. The component 5 can, for example, be configured as an OLED tile. The component 5 has several external contacts 21 of a first polarity, e.g., anode or cathode. The component has several electrical contacts 22 of a second polarity, e.g., cathode or anode. The respective contact can be configured as a contact strip provided on the outside of the component 5, which is expediently elongated. The respective contact can be radially projecting. The contacts 21 and 22 are located in the Fig. 8 and Fig. 9 shown schematically.

[0079] Multiple contacts of the same polarity can homogenize the charge carrier imprinting into the organic functional material of the device. A more homogeneous charge carrier imprinting can result in a homogenized luminance distribution on the radiation emission surface 2. The device 5 can have an optical output coupling structure, such as a scattering film or a microlens array (not explicitly shown). Furthermore, the device, or rather its organic functional material, is protected against external influences, such as moisture, preferably by means of a thin-film encapsulation. A thin-film encapsulation, which is produced, for example, by deposition, often has a lower resistance to heat transfer from the organic functional material compared to a thick encapsulation.

[0080] Fig. Figure 10 shows the conductor section 20 and the electrical connection parts 7 and 8, which are not yet attached to it. The conductor section 20 can be recessed, for example in a central area, as can the housing part 3. Thus, the often unsightly conductor section 20 is not visible from the back of the light source 1, regardless of whether a heat-conducting element 19 is provided or not. Furthermore, a recessed conductor section 20 contributes only minimally to the thermal resistance during heat dissipation to the outside via the heat-conducting element 19. The heat-conducting element 19 can form an outer surface of the light source 1, in particular the rear outer surface.

[0081] The conductor section 20 has a plurality of contact areas 23, 24. Furthermore, the conductor section has a connecting conductor guide surface 25. The contact areas 23 are preferably provided for electrically conductive connection with the contacts of the first polarity 21, and the contact areas 24 for electrically conductive connection with the contacts of the second polarity 22. Via connecting conductors on the connecting conductor guide surface 25 of the conductor section 20 (not explicitly shown), which are electrically connected to the contact areas 23, 24 but preferably run electrically separated from each other on the conductor section, the contacts 21 and 22 of the component 5 of the same polarity can be connected to a common electrical connection part 7 and 8, respectively. This allows the number of external electrical connection parts to be reduced compared to the number of electrical contacts of the component, in the illustrated embodiment from four to two.

[0082] The contact areas 23 and 24 can project from the connecting conductor guide surface 25 of the conductor part 20. The connecting conductor guide surface 25 can circumferentially define the recess of the conductor part 20. The respective contact area can be arranged axially offset, for example, in a stepped arrangement, from the connecting conductor guide surface 25. Preferably, the respective contact area is directed radially outwards. When the module 18 is inserted into the receptacle, the respective contact areas 23, 24 are preferably arranged above the step 14 and can rest on it.

[0083] In module 18, the conductor part 20 can be connected via a connection layer 35 (see Fig. 12) be connected to the component, in particular by a material bond. The bonding layer may contain an adhesive. The bonding layer may be formed by double-sided adhesive tape. The bonding layer is advantageously electrically insulating so that connecting conductors running on the conductor part 20 are not short-circuited. By means of the bonding layer 35, the conductor part 20 can be connected to the component 5 over a large area. For example, the connecting conductor guide surface 25 of the conductor part 20 can be mechanically connected to the component 5 via the bonding layer 35, such as by a material bond.

[0084] The respective contact areas 23, 24 can be electrically connected to the component via an anisotropically conductive layer (not explicitly shown). This layer can be electrically conductive in some areas and electrically insulating in others. In the contact areas 23, 24 to the contacts 21, 22 of the component 5, the layer is advantageously conductive to establish the electrical connection between the component and the conductor part 20. Outside the contact areas 23 and 24, the layer is advantageously electrically insulating.

[0085] The respective contact areas 23 and 24 can be connected to the optoelectronic component using an ACF process (also referred to as "bonding"). In an ACF process (ACF: anisotropic conductive film), an electrically insulating bonding agent, such as a non-conductive adhesive, which contains electrically conductive particles, is made conductive in selected areas by selectively applying pressure and / or temperature. This is achieved, for example, by increasing the density of conductive particles, while remaining electrically insulating in other areas that were not subjected to pressure or temperature.

[0086] The conductor section 20 further comprises one or more connection surfaces 26, 27. These connection surfaces are only indirectly mechanically connected to the component 5 in module 18. In other words, the connection surfaces are free of the bonding layer. The connection surfaces 26, 27 can be located next to the component 5 when viewed from above. The connection surfaces 26, 27 can project radially outwards from the conductor guide surface 25 when viewed from above. The connection surfaces 26, 27 can be offset axially from the conductor guide surface 25, particularly towards the back of the light source 1. In the area of ​​the connection surfaces 26, 27, the electrical connection parts 7 and 8, respectively, are electrically connected to the conductor section 20, for example, by soldering.

[0087] The conductor part 20 can be designed flexibly, for example as a flexible printed circuit board, such as a so-called flexboard or flex-PCB (PCB: printed circuit board).

[0088] In module 18, the connection surfaces 26, 27 of the conductor part 20 with the attached connection parts 7 and 8 are expediently designed to be flexible, which facilitates the insertion of the connection parts into the feedthroughs 12.

[0089] An ESD protection component (not explicitly shown), such as a protection diode, can be arranged on the conductor section 20. The protection diode is expediently connected antiparallel to the optoelectronic component and preferably also electrically connected to the terminal sections 7 and 8.

[0090] The conductor part 20 can have a film as a carrier for the conductors of the conductor part. The film can contain Kapton. The film is preferably thin, for example with a thickness of 350 µm or less, preferably with a thickness of 200 µm or less. The conductor part 20 can have an overall thickness of 350 µm or less, preferably 200 µm or less.

[0091] The shape of the conductor part 20, in particular its outline, may be adapted to that of the component 5, with possible minor protrusions, such as in the area of ​​the contact areas 23, 24 and the connection surfaces 26 and 27.

[0092] Fig. Figure 11 shows a schematic top view of the thermal conductivity element 19 of the module 18. The thermal conductivity element 19 has a connection surface 28. On this surface, the thermal conductivity element 19 is advantageously thermally connected to the component 5 in the module 18, for example by adhesive bonding. Outside the connection area with the component, in particular radially projecting from the connection surface 28, one or more thermal contact surfaces 29 of the thermal conductivity element 19 can be provided. The respective thermal contact surface 29 is advantageously arranged in the module 18 in the area of ​​the protrusion 13 of the housing part 3 and thermally connected to the associated thermal contact element 16 of the cover part 4, for example by means of a thermal paste.

[0093] Furthermore, the heat-conducting element 19 has one or more edge recesses 30. Through these recesses 30, the area of ​​the conductor part 20 with the connection surfaces 26, 27 can extend within the module 18.

[0094] The heat-conducting element 19 can be designed as a heat-distributing foil, for example as a metal foil or graphite foil. The foil is preferably thin. The foil can have a thickness of 500 µm or less.

[0095] The heat conducting element 19 is preferably connected to the back of the component over a substantially full surface.

[0096] Furthermore, the thermal conducting element 19 is thermally connected to the cover part 4 and thus to the front of the light source 1 via the thermal contact elements 16. Heat can be dissipated to the environment via the cover part 4. This can reduce the operating temperature of the component, thereby increasing its service life. Particularly with organic components, a reduction of just 3 °C in operating temperature can result in a 10% increase in service life.

[0097] The heat-conducting element 19 can form part of the outer surface of the light source 1, in particular part of the rear outer surface. Since the heat-conducting element 19 is visible from the outside in this case, for example through the rear recess in the housing part 3, it can be provided with an additional element, such as a film or a coating, so that a higher-quality aesthetic appearance is achieved from the outside.

[0098] Fig. Figure 12 shows, using a portion of the light source 1 as an example, the path of the thermal contact element, which extends alongside the component from the cover part 4 to the thermal connection surface 29 of the heat-conducting element 19 and is thermally connected to the heat-conducting element there. Furthermore, the tapering of the edge 11 of the housing part 3 in the outer edge region of the light source 1 can be seen, which creates a flatter overall impression.

[0099] Fig. Figure 13 shows in more detail, using a schematic sectional view of part of the light source 1, the function of the fixing element 17 based on its interaction with the electrical connection part 7. The design for the connection part 8 can be analogous. The external connection part 7 is guided outwards from the receptacle 9 through the opening 12, which is preferably provided laterally in the housing part 3. A portion of the connection part 7 advantageously remains in the housing part 3. This portion can include a projection that is advantageously larger than the dimensions of the opening. The connection part 7 thus cannot be completely pulled out of the housing.

[0100] A limit stop can be formed in housing part 3 by means of the projecting part of the connecting part 7 and a part of housing part 3. Such a limit stop is in Fig. 13 realized at reference numeral 31.

[0101] The electrical connection part 7 is secured against movement into the housing part 3 by the fixing element 17, which can form a stop limit for movement of the electrical connection part 7 relative to the housing part 3. By means of the stop limit 31 formed by the housing part 3 and the fixing element 17, the electrical connection part 7 can be held in a positionally stable position in the light source 1, for example, by clamping. In particular, axial displacement of the connection part 7 can be prevented. If the electrical connection part 7 is inserted into an external socket for contact, the connection part cannot slip back into the housing part 3. Preferably, the electrical connection part is held in a clamping position, so that rotation of the electrical connection part relative to the housing is also prevented. This reduces the risk of damage to a solder joint 32 between the conductor part 20 and the external connection part 7.

[0102] The electrically conductive external electrical connection part 7 is preferably electrically insulated from the cover part 4. The insulation can be achieved using an insulating material 33, for example, an insulating tape 33, which can be provided between the cover part 4 and the external electrical connection part 7. Thus, despite the low overall height, the risk of a short circuit between the external connection parts 7 and 8 via the cover part 4 is not increased.

[0103] Fig. Figure 14 shows a top view of the light source 1 with the cover 4 removed. The module 18 is inserted into the receptacle 9. Despite the precise fit of the receptacle 9, the entire module 18 can be manually accessed via the recesses 13, in which the optoelectronic component 5 is not located, and removed from the receptacle 9. Due to the flexibility of the conductor section 20, the external connections 7 and 8 can also be removed from the corresponding feedthroughs 12 by deforming the conductor section.

[0104] If the optoelectronic component 5 is defective, the light source can be easily unplugged from the luminaire due to the simple plug connection. Because of the detachable connection between the cover part 4 and the housing part 3, the cover part 4 can be easily removed from the housing part 3. To facilitate removal of the cover part 4, a slightly protruding or slightly recessed removal aid 34 can be provided on the cover part (see Fig. 15).

[0105] A defective module 18 can therefore even be easily replaced by the end user with a new module, which can be inserted into the receptacle 9 without any in-depth technical knowledge, with the connection parts leading outwards. Once the cover 4 is replaced, the external connection parts 7 and 8 are secured and the light source 1 can be reinstalled in the lighting system.

[0106] The inner edge of the recess in the cover part 4 can also provide a point of leverage, for example for a fingernail or a screwdriver, to detach the cover part 4 from the housing part 3. The removal aid 34 may therefore be unnecessary.

[0107] The Fig. Figures 16 to 19 show variations for elements of the embodiment described above.

[0108] In the variation according to Fig. No fasteners for a detachable connection are provided in section 16. Instead, fasteners 15a and 15b are provided, which form a non-detachable connection. In the exemplary embodiment, the fasteners 15a and 15b are designed for a snap-fit ​​connection, for example, as snap hooks. The fasteners 15a and 15b can be distributed at various locations around the circumference of the housing part 3 and the cover part 4, preferably in the respective edge regions. The respective fastener 15a, 15b can project from the cover part 4 or the housing part 3, respectively, and be connected to the other fastener. The respective fastener can be formed integrally with the housing part 3 or the cover part 4 or attached to it as a separate element. Such a non-detachable connection can be provided in the light sources described above and below.

[0109] In the Fig. Figures 17 to 19 schematically depict a variation of the light source 1 described above. The light source can be essentially the same as that described in connection with the preceding figures, unless otherwise indicated.

[0110] Like the light source described above, the housing part 4 has two projections 6 that lie on a common axis and are, in particular, aligned. The projections can be arranged at positions offset from each other by 180°. The light source 1 has an electrical connection part 7, which is designed as a connector for a two-pole plug connection, for example, a two-pole jack plug connection. The connection part 7 can, for example, be designed as a socket. The jack plug 38 of a light, which can engage in the socket, is in Fig. Figure 17 is shown schematically. The connecting part 7 is expediently arranged in the area of ​​a protrusion 6.

[0111] Opposite the connecting part 7, particularly in the area of ​​the other projection 6, a retaining device 36 is provided, which is designed as a recess extending into the housing part. The recess preferably does not extend into the receptacle but is axially limited by an end stop. The retaining device 36 can be designed to receive a retaining element, for example, a retaining pin, of the luminaire. The retaining connection formed between the retaining element and the retaining device preferably provides stable protection against relative axial movement. Furthermore, the retaining connection preferably allows rotational movement.Since the holding device 36 and the connecting part 7 are aligned along a common axis that runs through these elements, the light source held in the luminaire by means of the holding device 36 and the connecting part 7 is rotatable about this axis - analogous to the light source from the preceding figures, wherein a connecting part 8 is replaced by the holding device.

[0112] Fig. Figure 18 shows a top view of the light source 1 installed in the luminaire, which is secured in the luminaire by means of a retaining element 37 inserted into the holding device 36, the retaining element being, for example, designed as a retaining pin. The retaining element 37 is advantageously secured against axial movement relative to the holding device 36. The receiving end of the holding device 36 forms an end stop for the retaining element 37.

[0113] Fig. Figure 19 shows an exploded view of the light source 1, showing the cover part 4, the module 18, and the housing part 3. In contrast to the light source according to the Fig.According to the variation described here, the light source, as shown in figures 1 to 16, has a holding device 36 and a feedthrough 12 arranged opposite it, and in particular lying on a common axis. The feedthrough 12 allows the connection part 7 of the module 18 to be accessed from the outside when the module is inserted into the receptacle 9. In contrast to the previously described embodiment, the housing part 3 is not recessed in this variation. Therefore, the back of the module 18 is not visible from the outside. This allows a large-area heat distribution layer, for example as a copper layer or copper surface, such as a copper foil, to be integrated into the flexible conductor part 20. The conductor part can thus have a large area and an integrated thermal conductivity element.The conductor part 20 is usually not aesthetically pleasing, so it is practical to design the housing part 3 continuously and without a recess in order to keep the conductor part 20 invisible from the outside.

[0114] A homogeneous luminance distribution across the radiation emission surface of the component 5 can also be achieved through heat distribution via the large-area heat distribution layer in the conductor part 20. Thermal contact elements 16 can be provided, as in the other embodiment, but are not explicitly shown. The other elements described above can also be provided in this variation of the embodiment, unless explicitly stated otherwise. The heat distribution layer of the conductor part 20 can be thermally and, if necessary, electrically connected to a pole of the connection part, for example, to the cathode. A certain amount of heat dissipation from the component during operation can thus occur via the connection part 7, even if no thermal contact elements are provided.

[0115] The concept presented here can also be applied to other geometries of component 5 with a different contact layout. If necessary, the jack plug can even provide mechanical retention in the luminaire, thus eliminating the need for additional retaining devices for the light source 1. The total weight of the light source can be 100 g or less, for example, 80 g or less, such as 70 g. A jack plug can still support such a weight.

[0116] During operation, no safety distances, such as air and creepage distances, need to be observed in the area of ​​extra-low voltage. When connecting multiple light sources 1 in series, for example via the electrical connection parts 7 and 8, care should be taken to ensure that the extra-low voltage is not exceeded.

[0117] By appropriately designing housing part 3 and cover part 4, the housing can be adapted to the cold state of the light source 1, i.e., the state in which no radiation is emitted. For example, the component can be designed to be mirrored or diffusely reflective in its cold state. In this case, the cover part and preferably the housing part are also designed to be mirrored or diffusely reflective. The entire light source can thus function as a unified design element. Of course, different colors for the respective elements of the light source 1 that are visible from the outside are also possible.

[0118] A flexible conductor section 20 can optionally be omitted. This could be replaced by, for example, ultrasonically bonded wires, ribbon cables, and / or connectors. This would avoid the need for components adapted to the specific design of the device. However, this would complicate manufacturing, particularly assembly. The flexible conductor section facilitates the production of a compact module 18, which can also be replaced by the end user. The thermal interface material can optionally be omitted.

Claims

[1] Light source (1) with a radiation emission surface (2), wherein the light source (1) comprises: - a housing part (3) with a receptacle (9), - an organic optoelectronic device (5) arranged in the receptacle (9), and - a cover part (4) connected to the housing part (3), wherein the organic optoelectronic component (5) is held between the cover part (4) and the housing part (3), wherein the light source (1) has one or a plurality of external electrical connection parts (7, 8), and wherein the organic optoelectronic device (5) has a plurality of electrical contacts (21, 22) of the same polarity, wherein the contacts (21, 22) of the same polarity are connected via a connecting conductor of a conductor part (20) to the common external electrical connection part (7, 8) or to one of the plurality of external electrical connection parts (7, 8), wherein the cover part (4) is recessed in a radiation transmission area and wherein the housing part (3) is recessed in an area that overlaps with the radiation transmission area. [2] Light source (1) according to claim 1, having a maximum thickness of 8 mm or less. [3] Light source (1) according to at least one of the preceding claims, wherein the cover part (4) is magnetically formed and is detachably attached to the housing part (3) by means of magnetic forces. [4] Light source (1) according to at least one of the preceding claims, wherein the respective external electrical connection part (7, 8) is designed as a connection part for a jack plug connection. [5] Light source (1) according to at least one of the preceding claims, in which the light source (1) has the majority of external electrical connection parts (7, 8), and in which one connection part of the external electrical connection parts (7, 8) is designed as a male connection part of an electrical plug connection and another connection part of the external electrical connection parts (7, 8) is designed as a female connection part of an electrical plug connection. [6] Light source (1) according to at least one of the preceding claims, in which the light source (1) has the majority of external electrical connection parts (7, 8), and - wherein two external electrical connection parts (7, 8) are aligned along an axis extending through both external electrical connection parts (7, 8) or - wherein the light source (1) has a holding device (36), and the holding device (36) and an external electrical connection part (7) of the light source (1) are aligned along a common axis extending through the holding device (36) and the external electrical connection part (7). [7] Light source (1) according to at least one of the preceding claims, wherein the conductor part (20) is electrically connected to the organic optoelectronic component (5) via an anisotropically electrically conductive layer. [8] Light source (1) according to at least one of the preceding claims, wherein the conductor part (20) is a flexible printed circuit board. [9] Light source (1) according to one of the preceding claims, wherein the respective external electrical connection part (7, 8) is electrically connected to the conductor part (20) via a solder (32). [10] Light source (1) according to at least one of the preceding claims, wherein the cover part (4) comprises a fixing element (17) which is designed and arranged to secure one of the external electrical connection parts (7, 8) against movement relative to the housing part (3). [11] Light source (1) according to one of the preceding claims, wherein the cover part (4) has one or a plurality of thermal contact elements (16) via which the cover part (4) is thermally connected to the organic optoelectronic component (5), wherein a thermal conducting element (19) is arranged on the organic optoelectronic component (5) and is thermally connected to the organic optoelectronic component (5), wherein this thermal conducting element (19) has a thermal connection surface (29) which, viewed from above the radiation emission surface (2), is arranged next to the radiation emission surface (2), and wherein the thermal connection surface (29) is thermally connected to the thermal contact element (16) or one of the plurality of thermal contact elements (16) of the cover part (4). [12] Use of at least one connecting part for a jack connector as an external electrical connection part (7, 8) of a light source (1) according to at least one of the preceding claims with an organic optoelectronic component (5).

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