Light with a cover attached to a mounting bracket via an adapter and featuring a reinforcing rib

Description

[0001] The invention relates to a lamp according to the preamble of claim 1.

[0002] Luminaires of this type comprise a gear tray, a light source arranged on one mounting side of the gear tray, and a translucent cover attached to the gear tray. The cover can be, for example, transparent or translucent and may include, in particular, optical structures for light control, such as at least one prismatic structure, lens structure, or diffuser structure, for setting a predetermined light distribution curve of the luminaire.In the generic luminaire, both the gear tray and the cover, and thus the luminaire itself, are elongated in a longitudinal direction, their longitudinal extent preferably being at least three times, in particular at least five times, and in particular at least ten times, their extent along a vertical direction and / or along a transverse direction, and wherein the vertical and transverse directions are perpendicular to each other, and are oriented perpendicular to the longitudinal direction. In cross-section transverse to the longitudinal direction, the cover has a connecting section extending transversely to the longitudinal direction, which connects transversely spaced side sections, wherein a light-gathering space is formed between the cover and the gear tray, in which the light source is arranged.The luminaire is designed to emit light from the light source through the cover. The cover is fixed to the device carrier within its extension by means of a positive-locking connection acting in both a transverse and a vertical direction. An adapter is fixed to the device carrier, forming a first part of the positive-locking connection that corresponds to a second part of the positive-locking connection located on the cover. To form the positive-locking connection, the first and second parts are in positive contact with each other. The second part of the positive-locking connection has a support section located on the respective side section of the cover to support the cover against the device carrier, and a leg section that is spring-loaded and pivots relative to the support section, providing positive-locking surfaces.The adapter has an optically effective transverse section which is located in the transverse direction within a beam angle illuminated by the light source and which is designed to change the direction of the light emitted by the light source before the light reaches the cover.

[0003] Such elongated luminaires of this type are intended to efficiently illuminate large spaces in the most cost-effective way possible. These luminaires should be as inexpensive to manufacture and as simple in design as possible, also to facilitate cost-effective installation. By using an adapter to create a positive-lock connection between the cover and the gear tray, the complexity of the gear tray's design can be reduced, and the assembly of the luminaire can be simplified by connecting the cover to the gear tray via a positive-lock connection using the adapter. A luminaire of this type is disclosed, for example, in European Patent Application EP 3 653 927 A2.

[0004] The patent application US 2018 / 0128450 A1 relates to a luminaire comprising a housing, at least one light source, and an elongated optical cover that is functionally connected to the housing.

[0005] Particularly in embodiments where the cover, due to its dimensions (e.g., a large cross-section to provide specific light distribution functions), requires a positive-locking connection between the cover and the gear tray via the adapter, designed in such a way that the positive-locking connection can be created relatively easily during assembly of the luminaire. At the same time, this positive-locking connection should advantageously be designed to ensure reliable attachment of the cover to the gear tray, even when increased forces are exerted on sections of the positive-locking connection. Such increased forces can occur, for example, due to the relatively large weight of the cover resulting from its dimensions, or due to unintended forces acting on the positive-locking connection during assembly of the luminaire.

[0006] The invention is based on the objective of further developing a generic lamp in such a way that the further developed lamp meets the specified requirements in at least some possible applications.

[0007] According to the invention, the present problem is solved by a luminaire with the features of claim 1. The luminaire according to the invention comprises a gear tray, which can be configured for attaching a mounting rail extending longitudinally with the gear tray, wherein the mounting rail is configured for attachment to a structure, for example, a ceiling. Depending on the embodiment, this mounting rail can, for example, be attached directly to the ceiling or, to create a pendant luminaire, the mounting rail can be attached to the ceiling by means of tension members. The luminaire according to the invention further comprises a light source arranged on a mounting side of the gear tray and a translucent cover attached to the gear tray. The luminaire, the gear tray, and the cover are elongated in a longitudinal direction.The cover has a connecting section running transversely to the longitudinal direction, which connects transversely spaced side sections of the cover. A light-emitting space is formed between the cover and the mounting bracket, in which the light source is located. The light source is designed to emit light through the cover, and the cover is fixed to the mounting bracket within its extent by means of a positive locking connection acting in both a transverse and a vertical direction.

[0008] The luminaire according to the invention may have further features, which are specified in connection with the generic luminaires indicated above. The luminaire according to the invention further comprises an adapter that is fixed to the device carrier and that forms a first part of the positive locking connection, which corresponds to a second part of the positive locking connection provided on the cover, wherein the first part and the second part abut each other in a positive locking manner to form the positive locking connection. It has proven particularly preferred to manufacture the adapter from plastic, for example by means of extrusion, co-extrusion or injection molding processes. The second part of the positive locking connection provided on the cover has a support section arranged on the respective side section of the cover for support against or on the device carrier and a spring-elastic pivotable relative to the support section.The adapter features a deflectable leg section that provides interlocking surfaces which can correspond to interlocking surfaces on the first part of the interlocking connection located on the adapter. The adapter also has an optically effective transverse section that is located in the transverse direction within a beam angle illuminated by the light source and is designed to change the direction of the light emitted by the light source before the light reaches the cover.The luminaire according to the invention is characterized in that a form-fitting stabilizing rib extending transversely between the side sections of the cover and connected to them is arranged, which is further designed to perform a light-guiding function when light is transmitted through the rib, so that the stabilizing rib divides the luminaire space into at least two light compartments arranged one behind the other in a main direction of light, wherein the light compartments can be closed at the end face in the longitudinal direction.

[0009] By providing the transversely extending stabilizing rib of the cover between the two transversely spaced side sections, a particularly stable positive locking connection between the cover and the device carrier, provided via the adapter, can be ensured, such that an unintentional loosening of the positive locking connection between the cover and the device carrier can be avoided in normal operating situations or despite the comparatively high weight of the cover.Furthermore, this form-fitting stabilizing bridge can be provided with a light-guiding functionality due to its arrangement between the two transversely spaced side sections of the cover, since a predominant proportion, in particular at least 70%, preferably at least 80% or at least 90% of the light emitted by the light source, transmits this stabilizing bridge, so that this stabilizing bridge can simultaneously be designed to achieve a predetermined light distribution function of the luminaire.

[0010] The luminaire designed according to the invention is based on the idea of ​​providing a stabilizing rib in the area of ​​the second part or adjacent to the second part of the positive locking connection on the cover, which at least makes it more difficult for free areas of the transversely opposing side sections or the second part of the positive locking connection arranged in this area to be unintentionally deflected transversely outwards relative to each other in a spring-elastic manner, in order to prevent the first and second parts of the positive locking connection between the device carrier and the cover from disengaging, wherein the stabilizing rib is integrated into the light guidance of the luminaire to prevent light shadowing by being designed with a predetermined light-guiding functionality, for example by a predetermined structuring on at least one of its two interfaces and / or in the volume thereto.The form-fitting stabilizing bridge can be designed and arranged in such a way that a partial light space facing the device carrier and a partial light space facing away from the device carrier are formed, which are arranged one behind the other in the main light direction, which can be oriented or run parallel to the vertical direction.

[0011] In principle, a term such as vertical surface or transverse surface refers to a surface of a component of the luminaire according to the invention, or a tangential surface applied to the respective surface of a component of the luminaire according to the invention, whose respective normal vector runs vertically or transversely. In this respect, the term vertical interface of the stabilizing rib refers to an interface or a tangential surface applied to it, whose normal runs parallel to the vertical direction.

[0012] The statement that the stabilizing bridge is designed to perform a light-guiding function when light is transmitted through it is to be understood generally and broadly. For example, the stabilizing bridge can be designed as a planar or curved optical plate section, optionally with a surface structure specifically designed for light guidance, through which at least a portion of the light emitted by the light source is transmitted. The refraction of light at the interfaces of a possible planar stabilizing bridge can also include or effect such light guidance. The stabilizing bridge can, for example, be optically clear or transparent, or translucent. Preferably, the absorption coefficient of the stabilizing bridge material is low.

[0013] Additional features and further developments of the invention are specified in the following general description, the figures, the figure description and the dependent claims.

[0014] Particularly preferably, the positive locking connection, and thus the first part formed by the adapter and the second part formed by the cover, can extend over at least 50%, in particular at least 70%, of the longitudinal length of the device carrier or the luminaire.

[0015] Preferably, the adapter can be fixed to the device carrier via a further positive-locking connection, wherein a first part of this further positive-locking connection is formed by the adapter and a second part of this further positive-locking connection is formed by the device carrier. Providing a positive-locking connection for fixing the adapter to the device carrier can simplify the mounting of the adapter to the device carrier.

[0016] The adapter can be attached to the device carrier by means of a connection that is achieved by a fixing movement of the adapter relative to the device carrier and that can be reversibly released, in particular by a release movement opposite to the fixing movement. Preferably, corresponding connecting devices are provided on the adapter and the device carrier, which can be engaged by the fixing movement to establish the connection. The fixing and release movements preferably occur in a direction perpendicular to the vertical direction, and in particular parallel to the longitudinal direction. The connection can, for example, be designed as a clamping or snap-fit ​​connection.This connection between the adapter and the device carrier can, for example, be designed as a positive-locking connection, particularly as a positive-locking and simultaneously friction-locking connection, for instance by providing a suitably designed clamping or snap-fit ​​connection. In this embodiment, mounting the adapter to the device carrier is particularly simplified and especially advantageous for an automated process, since no separate fixing elements such as rivets or screws are required to create the connection between the adapter and the device carrier. It is particularly preferred that the adapter can be attached to the device carrier solely via such a connection and thus without the need for any further fixing elements.

[0017] Preferably, the positive-locking connection between the device carrier and the cover is designed as a rail connection using the adapter. This rail connection can be realized by the adapter and / or by the cover. This means that the cover and / or adapter each have a rail, i.e., a fixing element extending longitudinally with a constant cross-section, which can be inserted into a corresponding fixing element of the other element of the cover or adapter.Particularly preferably, the first part formed by the adapter and / or the second part formed by the cover of the positive locking connection has a constant cross-section perpendicular to the longitudinal direction over at least 80%, in particular at least 90%, in particular 95% of its longitudinal extent length, wherein the first part and / or the second part can extend with its longitudinal extent length over at least 50%, in particular at least 70%, in particular at least 80%, in particular at least 90% of the longitudinal extent length of the cover.

[0018] It can be provided that the mounting side of the device carrier faces the cover and is vertically opposite the cover, with the adapter being arranged on the mounting side and extending at least partially longitudinally along the light source and positioned alongside the light source in a transverse direction perpendicular to both the vertical and longitudinal directions. Preferably, the adapter is positioned transversely alongside the light source at both transverse ends of the light source in the aforementioned longitudinal section. It can also be provided that the adapter extends at least partially across the light source along the transverse direction, for example, for optical control and / or fixing of the light source.

[0019] To design the positive-locking connection between the device carrier and the cover, it is advantageously provided that the respective leg section of the second part of the positive-locking connection is arranged on the cover in a plane defined by the transverse and vertical directions, in section perpendicular to the longitudinal direction, in a spring-elastic manner. Each leg section can have a transverse and a vertical positive-locking surface, which interact with corresponding positive-locking surfaces on the first part of the positive-locking connection on the adapter to provide the described positive-locking connection between the device carrier and the cover. Preferably, each free end of the respective leg section can be L-shaped to provide the positive-locking surfaces, with the two positive-locking surfaces being arranged substantially perpendicular to each other, corresponding to the L-shape.Preferably, each leg section can have only a single vertical positive-locking surface, so that the positive-locking connection in the area of ​​the respective leg sections is open in one of the two vertical directions. Instead, in this embodiment, the positive-locking connection between the first and second part can be provided in this "free" vertical direction by a counter-surface on or to the device carrier via the respective support section of the second part arranged on the adapter, against which the support section is supported.

[0020] Due to the stabilization of the two transversely spaced side sections according to the invention, which ensures a positive fit between the device carrier and the cover, it is possible, compared to generic luminaires, to use covers with a larger cross-section in the longitudinal direction and / or, due to their construction, heavier covers, thus providing greater design flexibility for the luminaire according to the invention. In particular, it can be provided, for example, that the cover extends in the transverse direction on both sides by at least 10%, and in particular by at least 15%, 20%, 25%, 30% or at least 40% of the transverse extent of the device carrier.

[0021] It may be provided that a vertical section adjoins the second part of the positive-locking connection arranged on the cover at each side section, and that both vertical sections of the two side sections of the cover, particularly at their ends facing away from the device carrier, are connected by the stabilizing web. These two vertical sections may have a vertical extent that corresponds approximately to the vertical extent of the second part of the positive-locking connection on the cover, such that the stabilizing web, which may extend substantially transversely and longitudinally, is arranged closer to the device carrier than to the connecting section of the cover that closes off the cover in the vertical direction or main direction of light.

[0022] The second part of the positive-locking connection arranged on the cover, as well as the adjoining, transversely spaced vertical sections with the stabilizing rib connecting them, can form a first light compartment facing the device carrier, wherein the two vertical sections can advantageously have optically effective structuring on their inner and / or outer sides, in particular a microprismatic structuring, e.g. in the form of a longitudinal prismatic structuring (i.e. in the manner of a linear prismatic structuring in the longitudinal direction) to direct the light falling on the vertical sections to a predominant extent, in particular more than 50%, preferably more than 60% of the incident light, either in a direction vertically upwards to generate indirect light or vertically downwards to provide a direct light component with a predetermined light distribution curve.In this respect, the two transversely spaced vertical sections of the cover can be designed to essentially prevent light emission within a predetermined lateral opening cone, in order to avoid glare from the luminaire according to the invention when viewed from the side.

[0023] The described stabilization of the positive fit between the device carrier and the cover allows, particularly in a main beam direction behind the stabilizing rib, an enlargement of the cover in the transverse direction, for example, such that the transverse extent of the cover in the area of ​​the light compartment facing away from the device carrier is more than 125%, in particular more than 140%, preferably more than 170% of the transverse extent of the cover in the area of ​​the light compartment facing the device carrier. In one embodiment, it can also be provided that the transverse extent of the light compartment facing away from the device carrier is more than 200% of the transverse extent of the cover in the area of ​​the light compartment facing the device carrier.These embodiments, with a transversely enlarged light distribution area facing away from the mounting bracket, enable a large-area emission zone for the luminaire, providing greater flexibility in designing predefined light distribution functions compared to standard luminaires. In particular, an enlarged emission area of ​​the connecting section allows for improved glare control compared to a luminaire with a smaller connecting section, from which the majority of the light emitted by the lamp exits the cover.

[0024] In a preferred embodiment, the respective side section of the cover may have, in the area of ​​the light-emitting section facing away from the light source or the device carrier, a slanted section that increases the cross-section of the cover and can connect to the stabilizing rib in the main light direction. Depending on the embodiment, a vertical section extending in the main beam direction, particularly vertically, can be connected to the respective slanted section, and these transversely spaced vertical sections can be connected by means of the connecting section of the cover, which is straight, particularly in the transverse and / or longitudinal direction. This connecting section can be planar or...The cover and / or the luminaire according to the invention can have a rectangular base in this embodiment. It can be provided that the transversely spaced inclined sections of the side sections of the cover extend at an angle of approximately 70-30° to the vertical direction to adjust a predetermined transverse extension of the cover or luminaire in the area of ​​the light compartment facing away from the device carrier. In one embodiment, it can also be provided that a connecting section of the cover, which is particularly straight or flat, adjoins or transversely connects the inclined sections mentioned above, so that the vertical sections described in the embodiment above can be omitted in the area of ​​the connecting section.Depending on the embodiment, the inclined sections of the cover can be essentially flat and have an angle to the vertical greater than 20 degrees, in particular greater than 30 degrees, preferably greater than 45 degrees, in particular about 60 degrees.

[0025] To provide a predetermined light distribution through the stabilizing rib of the cover, the stabilizing rib can be designed to have at least one central section and two outer sections extending transversely to it on either side. The central section is designed to widen a beam of light passing through it, and the two outer sections are designed to focus the beam of light passing through their respective outer sections, in particular to achieve the most homogeneous light distribution possible on the inside of the connecting section of the cover, which closes it off in the main beam direction. The described optical effects of the central section and / or...The outer sections of the stabilizing rib are adjustable by designing relevant structures on the respective surfaces on the vertical top and / or bottom of the stabilizing rib, for example, by designing lens surface sections such as Fresnel lens structures, microprism structures, e.g., in the form of longitudinal prism structures. Such longitudinal prism structures on sections of the cover can be characterized by the fact that, in a section perpendicular to the longitudinal direction, they are essentially unchanged over the entire longitudinal extent of the cover, i.e., as linear prism structures in the longitudinal direction.

[0026] In one embodiment, the light source can comprise a circuit board on which at least one LED, and in particular a plurality of LEDs, can be arranged in a longitudinal row. The adapter can rest against the circuit board. In one embodiment, both transverse ends of the circuit board can each be arranged vertically, at least partially, between the mounting side of the device carrier and an adapter section associated with the respective transverse end. It is particularly preferred that the respective adapter section presses the respective transverse end of the circuit board against the device carrier, thereby fixing the circuit board to the device carrier by means of the adapter.However, it is also possible for the circuit board to be attached directly to the device carrier, for example by means of multiple tabs protruding from the device carrier, which are bent so that they rest on the circuit board and press it against the device carrier. It is also possible for the circuit board to have no contact with the adapter, particularly to avoid a direct thermal bridge between the circuit board and the adapter.In one embodiment, the first part of the positive locking connection between the device carrier and the cover can be formed by the two adapter section segments, wherein the two adapter section segments can each extend transversely beyond the circuit board, namely beyond the transverse end of the circuit board assigned to the respective adapter section segment and thus transversely next to the circuit board, wherein the cover with the second part of the positive locking connection formed by it can be arranged between the mounting side of the device carrier and a first of the adapter section segments as well as between the mounting side and a second of the adapter section segments.

[0027] Preferably, at least one of the adapter sections may have a stepped cross-section perpendicular to the longitudinal direction, wherein the stepped cross-section comprises a first transverse section that may abut the circuit board or the device carrier, and a second transverse section that forms at least a portion of the first part of the positive-locking connection between the cover and the device carrier and that abuts the cover, wherein, in particular, the second transverse section may be arranged vertically further away from the mounting side of the device carrier than the first transverse section. This second transverse section may, in particular, be designed as a transversely extending web. Preferably, the described design may apply to both adapter sections.Preferably, the adapter can extend vertically from the mounting side to the side of the device carrier opposite the mounting side and, in particular, engage behind the device carrier. For example, the adapter can have a section on the side of the device carrier vertically opposite the mounting side and overlap the device carrier on this side in a direction perpendicular to the vertical direction, thus engaging behind it, thereby providing a particularly simple and effective way to fix the adapter to the device carrier.In another embodiment, it may also be provided that a fixing part is attached to the section of the adapter which may extend through the device carrier to the side of the device carrier opposite the mounting side, the fixing part extending in the longitudinal and / or transverse direction, so that the fixing part rests against the side of the device carrier opposite the mounting side and provides a positive fit between the adapter and the device carrier 18a.

[0028] According to the invention, the adapter has an optically effective transverse section arranged in the transverse direction within a beam angle illuminated by the light source and configured to change the direction of the light emitted by the light source before it reaches the cover. Preferably, at least 70%, and more preferably at least 80%, of the light emitted by the light source passes through the optically effective transverse section of the adapter before it reaches the cover. Preferably, the optically effective transverse section of the adapter extends over the entire beam angle of the light source, so that all light emitted by the light source passes through the optically effective transverse section and can thus be deflected by it in a defined manner.The optically effective transverse section can, for example, be designed as a connecting section in the transverse direction to join the two adapter sections described above. In particular, the two adapter sections can be manufactured integrally together with the connecting transverse section, especially as an injection-molded element or as an extruded part to provide the described mechanical and / or optical functions of the adapter. In one embodiment, the transverse section of the adapter can also be designed in the form of a grid, possibly including through-holes (perforated sections) in the vertical direction.

[0029] The interface of the transverse section facing the light source and / or the interface of the adapter's transverse section modified to accommodate the light source can be shaped to provide appropriate light guidance by refraction, in particular by curvature, or, for example, by means of a microstructuring such as a longitudinal prism structure. These designs can be configured to parallelize or fan out the beam of light emanating from the light source. Furthermore, one or more so-called TIR surfaces can be formed on the transverse section, at which light is totally reflected for light guidance. The adapter, and thus also its transverse section, can be made, in particular, of a clear, transparent material such as PMMA, or, in another embodiment, of a translucent material.It is also possible that the adapter has one or more transparent and one or more translucent sections, which therefore exhibit different light-guiding properties. In curved designs where LEDs are used as the light source, it is further possible that the adapter has cavities assigned to one or more LEDs, into which the LEDs protrude at least partially to optimize light coupling into the adapter.

[0030] To generate a desired light distribution function of the luminaire according to the invention, the connecting section of the cover can be essentially flat or curved, and can be structured on its inner and / or outer surfaces with respect to the described light compartment, where the incident light is refracted. This can be achieved, for example, by means of a microstructuring such as a longitudinal prism structuring to direct the light entering and / or exiting the connecting section. Furthermore, the connecting section can also be provided with a volume to direct the light transmitting through it in a predetermined manner, for example, by adjusting the scattering properties of the volume material of the connecting section.

[0031] In one embodiment, the connecting section of the cover may be clear, i.e., transparent, in particular image- or view-transparent, regardless of whether this connecting section is microstructured for light guidance on none, one, or both interfaces (inner and outer surfaces). It may be provided that the remaining sections of the cover, in particular the two side sections and the stabilizing section, possibly including the second interlocking parts attached to the cover, are made of a translucent material. The term "translucent" used in this application may mean partially transparent or partially permeable and may indicate an image- or view-opaque state of the respective section of the cover.Such a translucent property of the material can be achieved, for example, by adding another material, particularly in the form of particles such as spheres made of a material with a different refractive index than the base material, to an otherwise clear or transparent material such as PMMA during an extrusion process to manufacture the cover, so that light transmitted through the material of the cover undergoes multiple scattering, which allows the cover to be opaque without the light being substantially absorbed.

[0032] In such a design, where the cover is homogeneous with respect to the material in all its sections, the cover can be manufactured, for example, using an injection molding process or an extrusion process, for example from PMMA.

[0033] In particular, it may be provided that the cover is manufactured by means of a co-extrusion process in which the connecting section comprises a transparent, pure PMMA material, while, for example, at least some or all other sections of the cover may be made of a translucent material such as PMMA with the described additive particles. It may also be provided, particularly in such an embodiment in which the connecting section of the cover is planar, that the cover has a recess on the inside and adjacent to the connecting section, in particular for receiving, for example, a planar optical element.The additional optical element can be inserted longitudinally into the receptacle and extends longitudinally with the connecting section, optionally being supported by it. The optical element can be configured to provide a predetermined optical functionality, for example, as a diffuser and / or as an element to prevent the light emission of the luminaire according to the invention within a predetermined angular range, particularly to avoid glare when viewing the luminaire from the side. The additional optical element can have a sandwich structure comprising several optically effective layers or films. The term "optically effective" is to be understood generally and can refer to structures designed for directing and / or guiding light.

[0034] In one embodiment, it is particularly advantageous that the light emitted by the light source is first optically directed in a predetermined manner by the adapter acting as primary optics, in particular such that a substantially predominant proportion of the light emitted by the light source, in particular more than 70%, preferably more than 80% of the light, falls onto the form-fitting stabilizing bridge acting as secondary optics, and this bridge is structured on its side facing the device carrier and / or its side facing away from the device carrier for light direction, in particular such that a predominant proportion of the light falling on the stabilizing bridge, in particular more than 60%, preferably more than 70% or 80% of the light, is directed onto the connecting section of the cover, at which point the predominant proportion of the light emitted by the lamp exits the cover or the luminaire.It may be provided that the optical properties of the adapter and the stabilizing bridge are adapted to the emission characteristics of the light source or the luminaire, in particular the LEDs, such that the connecting section of the cover or any additional optical element possibly supported thereon and associated with the connecting section of the cover is illuminated essentially homogeneously with essentially the same luminance. It may be provided that the optical properties of the cover, in particular by means of a light-guiding structure, on its surface(s) or of an additional optical element arranged thereon, together with the optical properties of the connecting section, are designed such that the desired light distribution curve of the luminaire can be generated. In the embodiment in which the adapter, positive-locking stabilizing bridge, and connecting section, possiblyIn conjunction with an additional optical element designed for light control, the connecting section, possibly in conjunction with the additional optical element, constitutes a tertiary optic of the luminaire. The additional optical element, located in and associated with the connecting section of the cover, can, for example, be translucent or have a surface structuring for light control, such as microstructuring on at least one of its surfaces, comprising microelements, for example, in the form of cones, pyramids, lenses, or prisms such as conical glare-reducing prisms.To provide an asymmetric light emission with respect to the surface normal of the connecting section, it may be provided that at least one of the two surfaces of the optical element is provided with such microelements which are tilted in their axis of symmetry to the surface normal of the optical element, i.e. take an angle other than zero, in particular an angle between about 10 degrees and 60 degrees.

[0035] According to the invention, the components of the luminaire or the cover, each designed with a respective optical light-guiding function, namely the adapter, stabilizing strut, and connecting section, optionally including an additional optical element associated with the latter, can be designed and arranged with respect to their optical properties in conjunction with the light source used, in particular a plurality of LEDs, such that a predetermined light distribution function of the luminaire according to the invention is achieved. The luminaire according to the invention offers a high degree of design flexibility in this respect, since in principle all components of the luminaire that have a light-guiding function can be adapted accordingly.In one embodiment, these components of the luminaire can be designed and arranged such that the luminaire has a symmetrical light distribution function with respect to a predetermined plane, which may include the longitudinal and vertical directions. Such a luminaire can, for example, be designed to illuminate a corridor or between shelves. However, it is also within the scope of the invention to design and arrange the aforementioned components of the cover in conjunction with the light source used in a luminaire according to the invention such that the illumination function, in particular a doubly asymmetrical light distribution function, has a similar effect. Such a luminaire can, for example, be designed to illuminate a shelf area, e.g., in such a way that the luminaire is arranged centrally on the ceiling facing the corridor and illuminates the shelves arranged on both sides of the center of the corridor.

[0036] To provide the positive locking connection between the cover and the device carrier, it can be provided that the respective second transverse section of the adapter part sections, e.g. in the form of a transverse projection or web, provides a transverse positive locking surface and a vertical positive locking surface of the first part of the positive locking connection between the cover and the device carrier, in particular such that these interact with associated positive locking surfaces of the cover, in particular with the L-shaped positive locking surfaces of the second part of the positive locking connection described above.Preferably, it can be provided that the first and second parts of the positive locking connection between the device carrier and the cover do not provide a positive locking connection in the form of a tongue-and-groove connection, but that, in particular, a positive locking connection is provided in only one of the two vertical directions, which significantly simplifies the fastening of the cover to the device carrier, wherein the set positive locking connection is stabilized by the stabilizing rib according to the invention to such an extent that the positive locking connection is securely set and stably maintained, essentially independent of the size or geometry of the cross-section of the cover.

[0037] To close off the lower light compartment facing away from the device carrier, it can be advantageously provided that at least one of its end faces, and in particular both end faces, is fitted with a head section, preferably translucent, in particular in the form of a head element, which is connected to the wall sections of the cover that define the lower light compartment at their respective end faces, in particular by bonding or welding. Similarly, it can be provided that an upper head section, in particular in the form of a head element, is arranged at the end face of the light compartment facing the device carrier to close off this light compartment.Advantageously, both head sections can be integrally formed as a single head element, preferably made of a translucent material such as PMMA as the base material, mixed with particles of a material different from the base material with a different refractive index and, for example, produced in an injection molding process, or made of a colored material. In such embodiments, in which both head sections are integrally formed as a single component for covering the frontal area of ​​the first and second clearances, it can advantageously be provided that an additional locking element, attachable to and possibly abutting the upper head section of the head element, is arranged to lock the positive-locking connection between the cover and the device carrier.This locking element, in addition to comprising an end wall, can have a front surface, which can be flat and approximately perpendicular to the transverse direction of the luminaire or cover, and can have locking projections spaced transversely apart from one another and extending longitudinally. These locking projections can be arranged and designed such that they bear against sections of the second part of the positive locking connection on the cover to prevent the positive locking connection between the cover and the device carrier from being disengaged by the first and second parts of the positive locking connection being disengaged in the area of ​​the front face of the cover. Advantageously, the locking element can be opaque, i.e., light-impermeable, so that the light source is covered when viewing the luminaire from the front.

[0038] Depending on the embodiment, the locking of the positive connection between the cover and the device carrier can also be provided without the need for an additional locking element. Instead, to lock the positive connection between the cover and the device carrier, it can be provided that one of these head sections, in particular the head section closing off the light compartment facing the device carrier, has, in addition to an end wall, an end surface which can be, in particular, flat and approximately perpendicular to the transverse direction of the luminaire or the cover, locking projections spaced transversely apart and extending longitudinally.These locking projections can be arranged and designed so that they abut sections of the second part of the positive locking connection on the cover to prevent the positive locking connection between the cover and the device carrier from being released by disengaging the first part and the second part of the positive locking connection in the area of ​​the front face of the cover.

[0039] Regardless of whether the locking projections are arranged on an additional locking element or on a head element, the locking projections can be designed to bear transversely on the outside of the second part of the positive locking connection, thus preventing the first and second parts of the positive locking connection from being disengaged in the area of ​​the end face for connecting the cover and the device carrier. In a particular embodiment, the locking projections can also be designed to extend in a longitudinally oriented cavity arranged transversely between the support section and the leg section, and / or bear against at least one transverse outer surface of the second part of the positive locking connection to prevent the positive locking connection between the cover and the device carrier from being released via the adapter.It may be advantageous to provide that the locking head section is opaque, i.e., light-impermeable, so that the light source is covered when looking at the front of the luminaire.

[0040] The invention further relates to a set for realizing a continuous lighting system, comprising a mounting rail and a plurality of luminaires according to one of the preceding claims, wherein the luminaires can be attached in series to the mounting rail via their respective gear trays. It may be provided that, for the realization of the continuous lighting system, through-wiring for supplying the individual luminaires is arranged within the mounting rail. It may be provided that each gear tray provides a positive-locking section which interacts with a complementary positive-locking section of the mounting rail to attach the respective gear tray of the respective luminaire, and thus the luminaire, to the mounting rail. Depending on the embodiment, the continuous lighting system can, for example, be attached directly to the ceiling via its mounting rail or, to create a pendant continuous lighting system, to the ceiling via tension members.To provide the necessary flexibility in complex lighting situations, which can vary depending on the installation location and even along a single light strip, it is advantageous for the inventive set to comprise several different adapters for realizing the light strip. These adapters differ in terms of the light-guiding function of their respective transverse sections. Preferably, the adapters differ only in terms of the transverse section that provides the light-guiding functionality and are otherwise identical in construction.Similarly, the set can be provided to comprise at least two different optical elements, each assigned to the connecting section of the cover, wherein the optical elements differ with respect to their light-directing functionality, so that luminaires with different light distribution functions can be designed within the light band using the set. For example, by using the described set according to the invention, it is possible to design a light band that has a symmetrical light distribution function over a first partial extension and an asymmetrical light distribution function over a subsequent partial extension.In particular, by using the set according to the invention with identical mounting rails and identical covers, it is possible to create a light strip that consists of a plurality of luminaires and essentially identical appearance, but which provide different light distribution functions.

[0041] The invention is explained below with reference to the accompanying drawings by describing one embodiment together with variations, wherein Figure 1 shows a perspective view of the structure of a lamp designed according to the invention; Figure 2 shows the lamp of the Figure 1 Figure 3 shows a front view of a head element that can be attached to an end face of the lamp cover, and Figure 4 shows a front view of the lamp itself. Figure 1 with attached head element of the Figure 3Figure 5 shows a locking element for securing the positive fit between the cover and the device carrier, Figure 6 shows a sectional view of the assembled lamp designed according to the invention in the area of ​​an end face with a view of the head element, and Figure 7 shows a perspective view of individual steps for assembling the lamp according to the invention.

[0042] The embodiment of the luminaire designed according to the invention of the Fig. 1The luminaire is elongated and features a mounting bracket 1, which is U-shaped in this case, with a central section 10 extending along the longitudinal axis X and side sections 11a and 11b extending approximately perpendicularly to the central section and thus vertically at its transverse ends. Each side section 11a and 11b has a mounting section at its free end for attachment to a mounting rail (not shown), which, depending on the embodiment, may also be elongated in the longitudinal direction. The luminaire also features a cover 2, which is attached to the mounting bracket 1 via an adapter 3. A light source in the form of a circuit board 4, comprising a plurality of LEDs, is arranged between the mounting side of the mounting bracket 1 facing the cover 2 and the adapter 3. The LEDs may be arranged in one or more rows longitudinally on the circuit board 4.The adapter 3, the circuit board 4, and the cover 2 are each attached to the mounting side of the device carrier 1. The adapter 3 forms a positive-locking connection with the cover 2, by means of which the cover 2 is fixed to the device carrier 1. For this purpose, the adapter 3 has two adapter sections 30a, b, each of which forms a portion of the first part of the positive-locking connection located on the adapter and thus together constitute the first part of this positive-locking connection.To provide a portion of the second part of the positive locking connection, which is arranged on the cover, the cover has, in the area of ​​two longitudinally extending side sections 22a, b, a cover section 20a, b at each of their free ends, each of which has a support section and a leg section that is spring-elastically pivotable relative to the support section in order to provide positive locking surfaces for interaction with complementary positive locking surfaces on the adapter sections 30a, b. In this respect, the two cover sections 20a, b of the cover 2 together form the second part of the positive locking connection for fixing the cover 2 to the device carrier 1.

[0043] In the described embodiment, the adapter 3 is formed in one piece, wherein the two longitudinally extending adapter sections 30a, b are connected by a transverse section or central section 31, which is designed and configured to absorb the light emitted by the LEDs 41 essentially completely and to direct it in a defined manner as an optical subsystem of the luminaire to achieve a predetermined light distribution function of the luminaire.

[0044] In the described embodiment, the longitudinally elongated cover 2 has two side sections 22a, b, which have a cover section 20a, b at their respective free end sections and which are connected at their vertical end, facing away from the device carrier, by means of a connecting section 21 extending transversely in the Y direction, for the optical termination of the luminaire or the cover, which in the described embodiment is flat and transparent.

[0045] Starting from the respective cover section 20a, b, which provides the second part of the positive locking connection between the cover and the adapter or device carrier, each side section has a vertical section 221a, b facing the respective cover section 20a, b, to which a respective inclined section 222a, b is attached, which transitions into a further vertical section 223a, b, wherein the planar connecting section 21 connects the two transversely spaced vertical sections 223a, b. To stabilize the positive locking connection between the cover 2 and the device carrier 1 or adapter 3, the cover 2 has a vertical section between the connecting section 21 and the second part of the positive locking connection.The two cover sections 20a, b are connected by a stabilizing rib 25 which connects the two side sections 22a, b and thus extends transversely and longitudinally, which in the described embodiment is designed with an optical functionality for directing the light in order to avoid shadowing effects and to set a predetermined light distribution curve of the luminaire.

[0046] In the described embodiment, the luminaire according to the invention can have at least three beams in one main direction, as shown in the illustration. Figure 1The optical sections arranged one behind the other in the Z direction comprise, in particular the central section 31 of the adapter 3, the stabilizing rib 25 of the cover and the connecting section 21 of the cover with a possibly further optical element, which in the described embodiment may be designed as a diffuser plate 50, which may be arranged adjacent to the flat connecting section 21.

[0047] In the described embodiment, the cover can be manufactured as a co-extruded part, in which all components of the cover are made of a translucent material and only the connecting section 21 connecting the two side sections 22a, b is made of a transparent material.

[0048] With reference to Figure 2, the following section will discuss in detail the design of the positive locking connection between cover 2 and device carrier 1 or adapter 3, as well as the optical properties of the specified optical elements provided by the adapter and the cover. Figure 2 The lamp designed according to the invention shows the Figure 1In a frontal end view. In the described embodiment, the positive locking connection between cover 2 and the device carrier 1 or the adapter 3 has, to facilitate engagement of the cover and device carrier or adapter, interlocking surfaces in the transverse direction on both the first and second parts of the positive locking connection, as well as interlocking surfaces in the vertical direction. The stabilization of the two side sections 22a, b by the stabilizing rib 25, as described above, prevents transverse movement of the two side sections relative to each other at their free ends, thus eliminating the need for a tongue-and-groove joint in the positive locking connection.

[0049] Instead, the respective leg section 202a, b, which adjoins the support section 201a, b of the respective side section 22a, b of the cover, can be essentially L-shaped, wherein this L-shaped section provides a vertical positive locking surface 203a and a transverse positive locking surface 204a, which interact with the respective portion of the first positive locking connection. For this purpose, the adapter section 30a, b can have a finger- or ridge-like transverse section 301a, b which provides a vertical positive locking surface 302a, b on its side facing the device carrier, which interacts with the associated vertical positive locking surface 203a, b of the respective leg section 202a, b of the cover 2, as well as a transverse positive locking surface 303b, which interacts with the associated positive locking surface 204a, b of the leg section 202a, b of the cover 2 for fixing the cover to the device carrier 1 or the device carrier 1.the adapter 3 interacts with the adapter. For clarity, the corresponding positive locking surfaces of the adapter and the cover are shown on different side sections 22a, b of the cover and the adapter, respectively. In the described embodiment, the respective positive locking surfaces on both sides of the cover and the adapter can be identical or symmetrically arranged.

[0050] As shown, the central section 31 of the adapter is designed to essentially receive and direct all of the light emitted by the LEDs. In one embodiment, the central section 31 of the adapter can direct the light as homogeneously as possible onto the inside of the stabilizing rib 25, whereby a small proportion of light incident obliquely to the main beam direction may strike the inside of the vertical sections 221a, b, which can be structured on the inside for defined light direction. For this purpose, the inside of the vertical sections 221a, b can have a microstructure, e.g., a linear prismatic structure in the longitudinal direction as shown, in the form of a sawtooth structure, which forms reflective surfaces.provides refractive surfaces to direct light upwards towards the ceiling in the opposite direction to the main beam to provide an indirect light component, and also provides a surface from which the light is refracted or deflected in the direction of the main beam to prevent a portion of the light from being emitted laterally from the luminaire.

[0051] Preferably, the stabilizing bridge 25 is transversely differentiated into different sections by different surface designs on the inner and / or outer sides to direct the light differently depending on the distance to a central longitudinal plane on which the LEDs are arranged in the described embodiment. Since the LEDs emit a large proportion of their light in the main beam direction, both the central section 31 of the adapter 3 and the central section A0 of the stabilizing bridge 25 are designed on their surfaces facing away from the light source and / or on their surfaces facing the light source to fan out the light into transverse sections, in particular by providing relevant microstructures on their surface sections, such as associated linear prismatic structuring in the longitudinal direction.

[0052] A transverse section A1.1, A1.2 can be connected to the central section A0 of the stabilizing rib 25. Unlike the central section A0, these transverse sections are designed to focus the light incident obliquely onto them in such a way that only a negligible portion of the light falls onto the oblique sections 222a, b, is transmitted through the wall, and exits the cover. Instead, the optical properties of the transverse sections A1.1, A1.2 are such that essentially all the light incident on them falls onto the inside of the connecting section 21, which is fitted with a planar optical element such as a diffuser plate 50, and exits the luminaire after transmission through the connecting section.

[0053] In a particularly advantageous embodiment, the central section 31 of the adapter 3 and the stabilizing rib 25 are designed in their optical properties such that the inside of the connecting section 21 of the cover, which may be covered with a diffuser plate 50 depending on the embodiment, is illuminated as homogeneously as possible, so that, starting from a most homogeneous illumination surface, which here is flat and extends over the entire longitudinal and transverse extent of the connecting section 21, a predetermined light distribution function of the luminaire can be generated by appropriate design of the diffuser plate and the connecting section 21 of the cover following in the direction of light.

[0054] The device carrier 1 and the cover visibly form a first light space R1, bounded in the direction of light by the stabilizing rib 25, in which the light source, comprising the circuit board 4 and the LEDs 41 connected to it, is arranged. This first light space R1 is bounded laterally by the vertical sections 221a, b and the cover sections 20a, b, which have the second part of the positive locking connection. Downstream of the first light space R1 in the direction of light is a second light space R2, which is defined or bounded vertically by the stabilizing rib 25 and the connecting section 21, and may be defined or bounded transversely by the inclined sections 22a, b and the adjoining vertical sections 223a, b.

[0055] Preferably, the luminaire designed according to the invention has a cover in the form of a head element on its front area, in particular to close off the respective light compartments R1, R2 and to prevent the ingress of dirt etc. and also to create a closed aesthetic impression of the luminaire. Figure 3 shows, starting from the representation of the Figure 2 The use of a head element 60, which is adapted to the front contour of the two light spaces R1, R2. For this purpose, the head element 60 can have two head sections arranged vertically one behind the other in the installed position, each of which is assigned to one of the two light spaces R1, R2. In the described embodiment, the head element 60 is formed flat with an inner surface 62b facing the interior of the cover and an outer surface 62a facing away from the interior of the cover. In the area of ​​the first light space R1, see Figure 2The head element 60, in its associated head section, can have a longitudinal web extending inwards approximately perpendicular to the surface of the head element. This longitudinal web comprises two longitudinal webs 621a, b spaced apart in the transverse direction and extending vertically, which are connected by a transversely extending longitudinal web 625. In the described embodiment, these longitudinal web sections 621a, b, 625 can project into the first clearance R1 and abut the vertical sections 221a, b and the stabilizing web 25. For this purpose, the aforementioned longitudinal webs have surface structuring on their sides facing the contact surfaces of the cover that corresponds to or complements each other, so that a planar mutual contact can be provided, which will be discussed in more detail below.Similarly, the lower head section of the head element 60 comprises two spaced-apart longitudinal ribs 623a, b extending vertically, which project into the second clearance R2 in the installed position and similarly abut the vertical sections 223a, b of the cover. The contact surfaces of the longitudinal ribs 623a, b can, in turn, have structures complementary to the corresponding contact surfaces of the vertical sections 223a, b of the cover to provide a planar mutual contact. In the described embodiment, the head element 60 can have two adjustment projections 624a, b, which, during pre-assembly, serve to attach the head element 60 to a corresponding end face of the cover 2.The lower part of the head element 60 can be materially bonded, in particular glued or welded, to the end face of the connecting section, the end faces of the lower vertical sections 223a, b, the end faces of the inclined sections 222a, b, and the end face of the stabilizing rib 25 of the cover 2. For this purpose, the head element 60 can have a circumferential joining surface 630 on its rear side 62b, corresponding to the aforementioned sections of the cover 2, see Figure 3.

[0056] As can be seen from the depiction of the Figure 4 evident, which is the head element 60 of the Figure 3 used in the Figure 2 As shown in the front face of the lamp according to the invention, the head element 60 can have two openings 61a, b on its front face, which are provided for fastening a further head element designed as a locking element, with which it extends into it with associated projections.

[0057] The locking element 70 of the described embodiment is shown in a single illustration in Figure 5The locking element 70 can have locking projections 71a, b associated with the two feedthroughs 61a, b of the head element 60, which can be locked into their edge regions. The locking element 70 can also comprise side sections 72a, b, which extend longitudinally along the luminaire in the installed position and bear against the outer contour of the vertical sections 221a, b and the cover sections 20a, b of the cover, thus preventing the cover sections 20a, b or the associated leg sections 202a, b from being transversely movable outwards relative to each other in order to release the positive fit between the cover 2 and the device carrier 1 or the adapter 3. The locking element thus reliably prevents an unintentional release of the aforementioned positive fit.In order to provide a longitudinally flat surface over the entire head area of ​​the head element, the described embodiment provides that the head element 60 is set slightly inwards in the longitudinal direction in the area of ​​the upper clearance R1 compared to the head surface in the area of ​​the clearance R2, such that after the insertion of the planar locking element 70 a continuous, in particular flat, head surface is present on the front side.

[0058] Figure 6Figure 1 shows a cross-sectional view, with the section plane perpendicular to the longitudinal axis (X-axis) of the luminaire, of an end face of the luminaire according to the invention, looking at the inside of the head element 60. The locking element 70 is recognizably engaged with the head element 60, which is connected to the cover 2, by the fact that the two locking projections 71a, b extend through the associated openings 61a, b of the head element 60 and form a positive fit with the edge sections of the openings, with corresponding locking lugs on the locking projections. Figure 6The connection of the longitudinal web of the head element 60 to the corresponding contact surfaces of the cover 2 is evident from the formation of a surface structure that is complementary to the corresponding surface of the cover. From the figure, this is visible, due to the perspective shown, only for the longitudinal web section 621b of the head element 60 with the vertical section 221b of the cover, and for the longitudinal web section 623b of the head element 60 with the vertical section 223b of the cover. Furthermore, it is evident from Figure 6 also the described gripping of the cover section 20a, b, which forms part of the positive locking connection on the cover for fastening the cover to the device carrier, by means of an associated locking projection 72a, b of the locking element 70.

[0059] With reference to Figure 7The following section describes the adjustment and locking of the positive fit between cover 2 and device carrier 1. The starting point is a manufacturing situation in which the adapter 3, which is formed in one piece, is attached to the mounting side of the device carrier 1, in particular by means of a plurality of positive fits along the longitudinal direction between the adapter and the device carrier. For example, the adapter can extend through the device carrier to the side opposite the mounting side by means of a plurality of locking tabs and be locked there. In the described embodiment, the adapter provides respective transverse sections 301 a, b, which provide the first part of the positive fit connection between the device carrier 1 and the cover.In a first step, each head element 60 is aligned transversely with the cover 2 at its end face and bonded to the cover at its end faces on the walls defining the lower clearance R2. In a second step, the cover 2 is engaged in the area of ​​the cover section sections 20a, b, which provide the second part of the positive locking connection, with the associated sections on the device carrier or the adapter, such that, as described, the support sections 201a, b are supported on the device carrier and the leg sections 202a, b, each with a vertical positive locking surface and a transverse positive locking surface, are supported on associated positive locking surfaces of the transverse sections 301a, b of the adapter.First, the parts of the positive-locking connection are engaged along the entire length of one of the two longitudinal sides, while the other side of the cover is pivoted slightly away from the device carrier. This side is then pivoted upwards until the associated support section on the cover comes to rest against the mounting side of the device carrier, and the other leg section engages in a vertical and transverse positive lock with the associated transverse section of the adapter. Finally, to lock the positive-locking connection, the locking element 70 is aligned and inserted by engaging the locking projections 71a, b (hidden in the figure) with the associated locking recesses 61a, b. Reference symbol list

[0060] 1 Device carrier 2 Cover 3 Adapter 4 Circuit board 10 Center section 11a, b Side section 20a, b Cover section 21 Connecting section 22a, b Side section 25 Stabilizing rib 30a, b Adapter section 31 Center section, transverse section 41 LEDs 50 Diffuser plate, optical element 60 Head element 61a, b Feedthrough, locking recess 62a Front 62b Back 70 Locking element 71, b Locking projection 72a, b Locking projection 201a, b Support section 202a, b Leg section 203a, b Vertical positive locking surface 204a, b Transverse positive locking surface 221a, b Vertical section 222a, b Inclined section 223a, b Vertical section 301a, bTransverse section 302a, bvertical form-fit surface 303a, btransverse form-fit surface 621a, bLongitudinal web 623a, bLongitudinal web 624a, bAdjustment projection 625Longitudinal web 630Joining surface A0Center section A1.1Transverse section A1.2Transverse section R1, R2Clearance

Claims

1. Lamp comprising a device carrier (1), a light source arranged on a mounting side of the device carrier and a translucent cover (2) attached to the device carrier, wherein the device carrier (1) and the cover (2) are elongated in a longitudinal direction (X), the cover comprises a connecting section (21) extending transversely to the longitudinal direction in cross section transversely to the longitudinal direction and side sections (22a, b) spaced apart by this connecting section (22a, b) spaced apart by the connecting section (21), wherein a light space is formed between the cover (2) and the device carrier (1) in which the light source is arranged, and the lamp is designed to emit light through the cover (2), wherein the cover (2) is fixed to the device carrier (1) within an extension of the device carrier (1) by means of a form-fitting connection acting in a transverse direction (Y) and a vertical direction (Z), an adapter (3) is fixed to the device carrier (1), which adapter forms a first part of the form-fitting connection that corresponds to a second part of the form-fitting connection arranged on the cover, wherein, to form the form-fitting connection, the first part and the second part abut each other in a form-fitting manner, and the second part of the form-fitting connection has a support section (201a, b) arranged on the respective side section (22a, b) of the cover (2) for support relative to the device carrier (1) and a leg section (202a, b) that can pivot elastically relative to the support section and provides form-fitting surfaces (203a, b; 204a, b), wherein the adapter (3) has an optically effective transverse section (31) which is located in the transverse direction (Y) within a beam angle illuminated by the light source and which is designed to change the direction of the light emitted by the light source before the light reaches the cover, characterized in that a form-fit stabilizing web (25) extending transversely between the side sections (22a, b) of the cover (2) and connected thereto, which is further designed to perform a light-deflecting function when light is transmitted through the stabilizing web (25), so that the stabilizing web divides the light space into at least two light sub-spaces (R1, R2) arranged one behind the other in a main light direction (R1, R2), wherein the light spaces (R1, R2) can be closed on the front side.

2. Lamp according to claim 1, characterized in that the respective leg section (202a, b) of the second part of the form-fitting connection is arranged to be elastically deflectable in a plane defined by the transverse direction (Y) and the vertical direction (Z) and has a transverse and a vertical form-fitting surface (203a, b; 204a, b).

3. Lamp according to claim 1 or 2, characterized in that the cover (2) extends beyond the device carrier (1) on both sides in the transverse direction (Y) by at least 10%, in particular 15%, of the transverse extension of the device carrier (1).

4. Lamp according to claim 1, 2 or 3, characterized in that a respective vertical section (221a, b) adjoins the respective second part of the form-fitting connection of the cover (2) at the respective side section (22a, b) and both vertical sections are connected by the stabilizing web (25).

5. Lamp according to any of claims 1 to 4, characterized in that the cover (2) increases in transverse direction behind the stabilizing web (25) in the main beam direction, such that the transverse extension of the cover (2) in the region of the light sub-space (R2) facing away from the device carrier (1) is more than 125%, in particular more than 140%, of the transverse extension of the cover (2) in the region of the light sub-space (R1) facing the device carrier, and / or that the respective side section (22a, b) of the cover (2) in the region of the light sub-space (R2) facing away from the light source has a respective inclined section (222a, b) which enlarges the cross-section of the cover and which is adjoined by a respective vertical section (223a, b), wherein the transversely spaced vertical sections (223a, b) are connected by means of the connecting section (21) which is designed to be straight, in particular in the transverse direction and / or in the longitudinal direction.

6. Lamp according to any of the preceding claims, characterized in that the stabilizing web (25) has at least one middled section (Aϕ) in the transverse direction and a respective outer section (Al.1, Al.2) adjoining this transversely on both sides, the middle section (Aϕ) being designed to widen a beam passing through the middle section and the two outer sections (Al.1, ALds.2) being designed to focus the beam passing through the respective outer section.

7. Lamp according to any of the preceding claims, characterized in that the light source comprises a circuit board (4) on which at least one LED (41) is arranged, wherein both transverse ends of the circuit board are each arranged at least longitudinal section-wise vertically between the mounting side of the device carrier (1) and an adapter subsection (30a, b) assigned to the respective transverse end (30a, b), and in particular the respective adapter subsection (30a, b) presses the respective transverse end of the circuit board against the device carrier (1), wherein in particular the first part of the form-fitting connection is formed by the two adapter subsections (30a, b), wherein the two adapter subsections each extend transversely beyond the circuit board and the cover (2) is arranged between the mounting side of the device carrier (1) and each of the two adapter subsections (30a, b) with the second part of the form-fitting connection formed by it.

8. Lamp according to claim 7, characterized in that at least one of the adapter subsections (30a, b) has a stepped cross-section perpendicular to the longitudinal direction (X), wherein the stepped cross-section comprises a first transverse section (301a, b) which rests against the circuit board or the device carrier, and a second transverse section which forms at least a portion of the first part of the form-fitting connection and rests against the cover (2), wherein in particular the second transverse section is spaced further vertically from the mounting side of the device carrier (1) than the first transverse section.

9. Lamp according to any of the preceding claims, characterized in that the adapter (3) extends vertically from the mounting side to the side of the device carrier opposite the mounting side and engages behind the device carrier.

10. Lamp according to any of the preceding claims, characterized in that the connecting section (21) of the cover (2) is essentially flat and is itself, or a flat optical element (50) supported by it, designed in particular in cooperation with the optically effective connecting section to produce a predetermined light distribution function.

11. Lamp according to any of claims 8 to 10, characterized in that the second transverse section (301a, b) of the at least one adapter subsection (30a, b) provides a transverse form-fitting surface (303a, b) and a vertical form-fitting surface (302a, b) of the first part of the form-fitting connection between the cover and the device carrier.

12. Lamp according to any of the preceding claims, characterized in that the lower light sub-space (R2) in the vertical direction, which is closed by the connecting section (21), is sealed at the front side of the head element (60).

13. Lamp according to any of the preceding claims, characterized in that an upper head section or a locking element (70) is arranged on the front side relative to the light sub-space facing the device carrier (1), which has a head surface and locking projections (72a, b) spaced transversely from each other and extending in the longitudinal direction (72a, b) that bear against sections of the second parts of the form-fitting connection, wherein in particular the locking projections (72a, b) each extend into a cavity (205a, b) arranged transversely between the support section (201a, b) and the leg section (202a, b) and running in the longitudinal direction and / or bear against at least one transverse outer surface of the second part of the form-fitting connection.

14. Set for implementing a lamp in the manner of a light strip, comprising a support rail and a plurality of lamps according to any of the preceding claims, wherein the lamps can be fastened in series to the support rail via their respective device carriers (1), wherein in particular the set - includes at least two different adapters (3) which differ in the light-directing function of the respective transverse section (31) of the respective adapter (3), and / or - includes at least two different additional optical elements (50) assigned to the respective connecting section of the respective cover (2), which differ in terms of their light-directing function, for setting different light distribution functions of at least two lamps.