light

Abstract

The invention relates to a luminaire 1, comprising a housing, a light guide plate 2 with opposing main surfaces 20a, b and an end surface 21, wherein light from LED light source can be coupled into the light guide plate 2, and with a cover 9, which receives light emerging from the light guide plate 2 on an inner surface 41 and emits it on an outer surface 42 to generate a predetermined light distribution function of the luminaire 1.The luminaire according to the invention is characterized in that the light guide plate 2 has a plurality of recesses 22a, b, 23a, b angled towards each other and extending from one main surface 20a, b towards the other main surface 20a, b for at least partially receiving the LED light sources 80 for coupling light into the light guide plate 2, and the other main surface 20a, b and / or the end surface 21 is designed as a light output surface, wherein a plurality of elongated LED light source arrangements 8, each assigned to a recess 22a, b, 23a, b and comprising several LED light sources 80, are arranged on a respective elongated electrical surface. Circuit board 7 is arranged, and the respective light source arrangement 8 extends over its longitudinal extent into the associated recess 22a, b, 23a, b of the light guide plate 2, so that a respective light source arrangement 8 is aligned to the associated recess 22a, b, 23a, b.

Description

[0001] The invention relates to a luminaire comprising a housing, a light guide plate connected to the housing with opposing main surfaces and an end surface, wherein light from LED light source can be coupled into the light guide plate, and with a cover that receives light emerging from the light guide plate on an inner surface and emits it on an outer surface to generate a predetermined light distribution function of the luminaire.

[0002] Such luminaires are well-known in the field and are used in particular to handle lighting tasks that require a large, homogeneously emitting light surface. For example, in the prior art, LED modules with a large number of directly emitting LEDs are typically used to backlight a luminaire cover, especially one designed as a diffuse diffuser. The LEDs can be fitted with so-called backlit lenses to achieve the same homogeneity with fewer LEDs. In flat-panel luminaires, light guide plates are used with light coupling at at least one outer edge or end face.

[0003] Such a conventional luminaire requires a great deal of manufacturing effort due to the large number of LED light sources; furthermore, an LED module designed for each luminaire's specific size and shape must be provided; and in addition, adapting the light sources used to developments in the LED light source sector is hardly feasible, so that even if lighting requirements change, a new luminaire adapted to those requirements must be provided.

[0004] German patent application DE 101 02 587 A1 relates to a lighting device with a light guide plate comprising a light-emitting surface and a plurality of channels, each with at least one substantially linear light source. German patent application GB 2 470 719 A relates to lighting units comprising transparent or translucent films and a light source located in a recess within the covering of the film, and in particular on the front side of the film. German patent application US 2009 / 0237593 A1 relates to a backlighting device with a hole or a projection formed on the light-emitting surface of a light guide plate or on the back surface opposite the light-emitting surface, wherein a side face of the hole or projection is oriented approximately perpendicular to the light-emitting surface.An angular distribution of the light from a light source is provided by an approximately perpendicular side surface of the hole or projection, so that the light is guided within the light guide plate and emitted to the outside.

[0005] The present invention has the technical objective of at least partially overcoming the aforementioned disadvantages of the described conventional luminaires. This objective is achieved by providing a luminaire comprising a housing, a light guide plate with opposing main surfaces and an end face, wherein light from an LED light source can be coupled into the light guide plate, and a cover that receives light emerging from the light guide plate on an inner surface and emits it on an outer surface to generate a predetermined light distribution function of the luminaire.The luminaire according to the invention is characterized in that the light guide plate has a plurality of recesses angled towards each other, extending from one main surface towards the other main surface, for at least partially receiving the LED light sources for coupling light into the light guide plate, and the other main surface and / or the end surface is designed as a light coupling surface, wherein a plurality of elongated LED light source arrangements, each associated with a recess and comprising several LED light sources, are arranged on a respective associated elongated electrical circuit board, wherein the respective light source arrangement extends at least partially along its longitudinal extent, preferably along its entire longitudinal extent, into the associated recess of the light guide plate and preferably in a direction perpendicular to the longitudinal extent of the light source arrangement.the associated electronic circuit board, protrudes into it, so that each lighting arrangement is aligned with the associated recess.

[0006] The luminaire according to the invention is based on the idea of ​​coupling the light from the necessary LED light sources not to the front face, edge, or one of the main surfaces of the light guide plate, but rather to a plurality of recesses angled towards each other and extending from one main surface towards the other. LED light sources assigned to a single recess of the light guide plate are arranged in a single, elongated LED light source assembly on a respective elongated electrical circuit board, so that this circuit board can be aligned with the assigned recess, and the entire light source assembly assigned to the respective recess can be positioned by aligning this circuit board, thereby significantly simplifying the assembly of the luminaire according to the invention.Furthermore, for example, if the efficiency of LED light sources is increased or the lighting task changes, the respective adjustment can be made to the luminaire according to the invention by simply replacing LED light source arrangements or the electronic circuit boards supporting the LED light source arrangements, without having to replace the entire luminaire.

[0007] Additional features and further developments of the invention are specified in the following general description, the figures, the figure description, the dependent claims and the collateral claim.

[0008] In principle, it can be provided that at least one of the recesses extending from one main surface to the other of the main surfaces of the light guide plate, or all recesses, have an elongated and curved, i.e., non-linear, profile along one main surface. In this embodiment, the associated electronic circuit board, which carries the elongated LED light source arrangement associated with the recess, can also be curved in the same way so that the elongated electronic circuit board can be inserted, at least partially, into the associated recess to accommodate the elongated LED light source arrangement. For example, recesses spaced apart from one another, particularly on one main surface, can be arranged along a spiral line on said main surface of the light guide plate.In this embodiment, the recesses are arranged in a row spaced apart from one another, with this row arrangement of recesses forming a spiral. Furthermore, a curved recess and an adapted LED light source arrangement can be particularly advantageous for curved end faces of the light guide plate to achieve predetermined light distributions, e.g., homogeneous light distributions within the light guide plate.

[0009] To simplify the design of the luminaire according to the invention and to use, for example, flat electronic circuit boards, it can be advantageously provided that a majority of the recesses extending from the one main surface of the light guide plate, in particular all recesses, have a linear, i.e. straight, extent in the one main surface, wherein preferably the recesses in the main surface can be offset from each other and not intersecting each other.Preferably, a first number, in particular half, of the recesses are parallel to each other, with a second number, like the remaining number of recesses, in particular half, also being parallel to each other. These directions of extension of the first and second number of recesses can be oriented perpendicular to each other for optimized light injection into the light guide plate, particularly to achieve the most homogeneous light distribution possible within the light guide plate. However, in a particular embodiment, the distribution of the recesses, and thus of the associated LED light source arrangement, on one main surface of the light guide plate can also be designed in such a way as to cause a non-homogeneous light distribution within the light guide plate, insofar as this is required by the respective lighting task.

[0010] To achieve a homogeneous or non-homogeneous light distribution, it may also be possible to adjust the "row density" of the LED light sources in the LED light source arrangements or on the associated electronic circuit boards to the desired light distribution. The term "row density of LEDs" refers to the number of LEDs per unit length in the direction of the recess or the electronic circuit board.

[0011] According to the invention, the recesses extending from one main surface towards the other main surface of the light guide plate for receiving a respective LED light source arrangement can be designed, at least partially, along their longitudinal extent, and in particular along their entire longitudinal extent, as a slot or as a groove. While in the first case the recess extends from one main surface to the other main surface of the light guide plate, in the case of a groove, the respective recess does not extend over the entire thickness of the light guide plate, so that a respective groove base delimits the recess extending from one main surface towards the other main surface.

[0012] If the recesses are designed as grooves, the grooves for receiving a respective elongated LED light source arrangement can have the same groove depth. In one embodiment, it can also be provided that the groove depth in a given groove is constant, but the groove depths of different grooves are different. Furthermore, it can also be provided that the groove depth of a given groove varies along its longitudinal extent.

[0013] In principle, the cross-sectional design of the grooves on one main surface of the light guide plate can be rectangular with two planes and opposing groove flanks, at which the light from the associated LED light source arrangement can be coupled into the light guide plate. However, other groove shapes are also feasible within the scope of the invention, for example, one or more of the grooves can be U-shaped with a curved groove base surface and / or grooves in which the groove flanks are not parallel and / or are inclined, i.e., not perpendicular to the groove base. The same applies to embodiments in which recesses are designed as slot recesses. The slot flanks, which define the slot in a lateral direction, can in particular be designed as flat, opposing surfaces at which the light from the associated LED light source arrangement can be coupled into the light guide plate.However, other slot flanks are also feasible within the scope of the invention, in which the flanks do not run parallel and / or obliquely, i.e. not perpendicular to the main surfaces.

[0014] Preferably, the recesses and thus the associated LED light source arrangements on the light guide plate can be arranged in such a way that each recess and thus each LED light source arrangement is directly illuminated by another LED light source arrangement with respect to both sides of the recess, in order to provide the most homogeneous light distribution possible within the entire volume of the light guide plate.

[0015] Such a homogeneous light distribution in the light guide plate is also facilitated by the fact that the respective width, i.e., the distance between the two sides of a recess, is comparatively small and is, for example, in the range of approximately 1 mm to 4 mm, in particular 2 mm to 3 mm, preferably 2.5 mm. For the at least partial insertion of the associated LED light source arrangement or the electrical circuit board supporting it, their thickness dimensions can be approximately in this range or slightly smaller, for example by about 10% to 20%.

[0016] To design a luminaire that is as flat as possible, it is advantageous to keep the thickness of the light guide plate small, in particular < 15 mm, preferably < 10 mm, for example 8 mm or 9 mm.

[0017] Both glass materials and optical plastic materials can be used as materials for the light guide plate within the scope of the invention. Suitable optical plastic materials include, for example, polycarbonates (PC), polyethylene (PE), or polymethyl methacrylate (PMMA).

[0018] Advantageously, it can be provided that, in the installed position, a thickness direction of a respective electrical circuit board coincides with a width direction of the associated recess, and that on a main surface of the electrical circuit board that defines its thickness, a series arrangement of LED light sources, in particular a geometric and / or electrical configuration, is arranged for coupling light into the light guide board at one of the two flanks of the associated recess. Furthermore, it can be provided that on the other main surface of the electrical circuit board that defines its thickness, another series arrangement of LED light sources, in particular a geometric and / or electrical configuration, is arranged for coupling light into the light guide board at the other flank of the associated recess.It is also possible that in embodiments where LED light sources are arranged on both main surfaces of the electrical circuit board, these light sources are arranged in an electrical series circuit, with LEDs on the first main surface and LEDs on the second main surface being alternately connected in this series circuit. The coupling of LED light sources to both sides of a respective recess increases the luminous flux coupled into the light guide plate, which expands the application potential of the luminaire according to the invention.

[0019] To prevent LED-emitting light from being coupled into the light guide plate by the associated LED light source arrangement in the area of ​​a respective groove base, and from exiting the light guide plate directly at the opposite main surface by refraction, or from LED-emitting light from the light source arrangement passing through the slot in the case of a recess design without being coupled into the light guide plate, it may be advantageous to provide a shielding section for each LED light source arrangement, which extends in the wide direction of the recess at least to an emission surface of the LED light source arrangement, preferably beyond, and blocks the light traveling towards the groove base or in the slot.

[0020] Such a shielding section can be designed, for example, by applying an opaque shielding layer to the base of a groove in the light guide plate, whereby this shielding layer can be created, for example, by coating the base of the groove or by directly applying a layer material or a film to the base of the groove.

[0021] However, it is also possible that the shielding section is provided by the electronic circuit board or a section of a carrier of a respective electronic circuit board, wherein the carrier (circuit board carrier) can overhang the LED light source arrangement supported by the electronic circuit board in the width direction of the associated recess to block LED light traveling towards the bottom of the groove or in the slot.

[0022] For example, such a shielding section can be attached to the respective electrical circuit board or be integrally manufactured with it, and can overlap the respective slot base or slot opening on the side facing the respective slot opening, thus shielding the LED light sources of the LED light source arrangement attached to the electrical circuit board from the slot base or slot opening.

[0023] It is also possible that the LED light sources are recessed into their associated electronic circuit board, so that the LED light sources are shielded from the bottom of the slot or the slot opening by sections of the circuit board. Furthermore, an element may be provided on the end face of the circuit board facing the bottom of the slot, allowing the circuit board to project or overlap substantially parallel to the bottom of the slot and thus cover the bottom of the slot to prevent light from the LED light source arrangement from being directly coupled into the bottom of the slot of the associated slot of the respective LED light source arrangement.

[0024] In embodiments in which at least one of the recesses of the light guide plate is designed as a slot, the shielding section can be arranged above, i.e. behind, the light guide plate in the main direction of light, which can usually run approximately perpendicular to the light guide plate, e.g. on the electronic circuit board or on the carrier of the electronic circuit board or be integrally manufactured with it.

[0025] To support the optical fiber, the housing can have a plate-shaped housing section to which the optical fiber can be attached at a distance. A plurality of spacers, particularly column-shaped ones, can be arranged between the plate-shaped housing section and the optical fiber. These spacers can be connected at their ends to both the plate-shaped housing section and the optical fiber, for example, by means of a screw connection or a snap-fit ​​connection. In the snap-fit ​​connection configuration, the spacers can, for example, have at least one contact surface and a locking device in the form of a locking element that extends through the opening in the optical fiber and is locked to the optical fiber on the light-emitting side or within the opening. The spacers can be arranged to bear directly or indirectly against the main surface of the optical fiber.

[0026] Preferably, the space between the light guide plate and the plate-shaped housing section can be used to arrange electronic components of the luminaire, such as control electronics, power supply, sensor equipment, and / or emergency battery equipment, so that the luminaire according to the invention can be very flat. The described arrangement of the specified electronic components of the luminaire between the light guide plate and the plate-shaped housing section enables a very compact design of the luminaire according to the invention, which, in addition to the thickness of the light guide plate, can be determined in particular by the longitudinal extent of the spacers in the main direction of light transmission between the light guide plate and the plate-shaped housing section.

[0027] As already explained, it can be provided that each electrical circuit board is assigned a circuit board carrier attached to the housing to support the respective electronic circuit board. The circuit board carrier can be L-shaped with a mounting leg and a support leg angled relative to it, which supports the respective electronic circuit board at a free end section, or to which the circuit board is attached. Advantageously, the circuit board carrier can be designed such that it extends over a predominant portion of its longitudinal extent, in particular over its entire longitudinal extent, in contact with the support leg of the circuit board carrier, thereby providing stable fixation of the relative arrangement of the electrical circuit board with the attached LED light source assembly to the corresponding groove or slot of the light guide board.Furthermore, efficient heat transfer from the printed circuit board to the associated board substrate can be advantageous. For this purpose, the board substrate can be made of a highly conductive material, such as a metal, and good heat transfer between the board substrate and the printed circuit board can be ensured, particularly through the use of thermal paste in the area where the board substrate contacts the electronic circuit board.

[0028] In another embodiment, the circuit board carrier can also be C-shaped or S-shaped, whereby an end area of ​​the circuit board carrier can then be designed as a shield and / or reflector to prevent light from leaving the light guide plate in the area of ​​the recess or slot.

[0029] Depending on the embodiment, it may also be provided that the printed circuit board carriers are designed by means of a cutout in the housing base plate 4 and subsequent bending, and are therefore not required as additional components. Depending on the embodiment, these can also be designed at their free end as a shielding section to prevent the free passage of light through the cutout or slot by simply bending them again at their free end.

[0030] To further homogenize the light emerging from the light guide plate and / or for design purposes, the cover of the luminaire according to the invention can be designed as a diffuser, which may have a trough-like shape. To achieve a flat luminaire according to the invention and to optimize the luminaire's emission characteristics, the cover can be arranged at a very small distance from the light guide plate, in particular at a distance of approximately 4 to 10 times the width of the recesses, i.e., the groove width or slot width, and in particular at approximately 6 times the recess width.

[0031] In a further embodiment, the cover can also be designed and arranged not as a diffuser, but as a light-directing optical element, in particular as a secondary optical element to the light guide plate designed as the primary optical element. For this purpose, the cover can be structured accordingly, especially on its inner surface, e.g., it can have light-refracting structures such as microprismatic patterns. In this embodiment as well, the cover can be trough-shaped.

[0032] As shown, the cover can be designed in a trough-like shape with a light emission section and a mounting section extending approximately perpendicularly beyond the light guide plate towards housing sections, to which the cover can be attached. Preferably, the light emission section can be arranged to run approximately parallel to and spaced apart from the light guide plate in the main direction of light emission. To optimize the light emission of the luminaire according to the invention, the mounting section of the cover can be circumferentially projected beyond the housing and has locking sections on the inside that interact with complementary locking sections of the housing to hold the cover to the housing.In principle, the housing can be designed in a pot-like shape, in particular comprising a plate-like section for attachment to a building element such as a ceiling or a wall and an edge or flange section that can extend vertically from the plate-like section, e.g.

[0033] According to the invention, it is also possible for the light guide plate to be attached to the cover, and the cover then to the housing, which can simplify maintenance. For example, the light guide plate can have locking elements that interact with complementary locking elements on the cover to hold the light guide plate to the cover. In one embodiment, the circuit board can be held in an undercut on the cover. The cover, in turn, can have locking elements that interact with complementary locking elements on the housing to hold the cover, which carries the light guide plate, to the housing. These complementary locking means can, for example, be designed as locking hooks and locking recesses.

[0034] Preferably, the LED light sources of an LED light source arrangement can be applied to the respective electronic circuit board using COB technology (COB: Chip on board), wherein the LEDs can be coated with a fluorescent layer to adjust a predetermined spectrum of the emitted light.

[0035] To optimally utilize the light generated by the LED light source arrangements for designing a predetermined light distribution function, it may be expedient to provide that a reflector device, in particular a reflector element and / or a reflective coating, is arranged at least partially on the main surface of the light guide plate facing away from the main direction of light or towards the plate-shaped housing section.

[0036] To selectively extract the light transmitted in the optical fiber plate at the extraction surface of the optical fiber plate, the main surface of the optical fiber plate opposite the extraction surface—i.e., the main surface facing away from the main direction of light transmission or the plate-shaped housing section—can be structured, in particular by printing, embossing, and / or laser marking. The light output can be further increased by combining such structuring of the main surface facing away from the extraction surface with the provision of the described reflector device, in particular a reflector element and / or a reflective coating, which can then be arranged on the structured main surface facing away from the extraction surface.

[0037] The output surface of the optical fiber itself can be unstructured. Depending on the embodiment, the end face or circumferential edge of the optical fiber can be unstructured or structured, particularly by printing, embossing, and / or laser marking. In particular, the end face or circumferential edge of the optical fiber can have a prismatic structure.

[0038] In order to allow for flexibility with regard to the respective lighting task and with regard to efficiency improvements in the field of LED light sources when using the luminaire according to the invention, the above problem is further solved by a system comprising a luminaire according to one of claims 1 to 18, which includes as a set the said elongated LED light source arrangements, which are arranged in a row arrangement on a respective elongated electrical circuit board, wherein the set here refers to the entirety of all LED light source arrangements, which are each arranged on an electrical circuit board for the design of the luminaire according to the invention.To provide flexibility regarding changes to the lighting task or adaptation to new LED light sources, this system includes at least one further set of elongated LED light source assemblies arranged on a respective elongated electrical circuit board for replacing the first-mentioned set of LED light source assemblies, wherein the LED light source assemblies of the sets differ, for example, in terms of the number of LED light sources, the physical properties of the light emitted by the LED light source, and / or the arrangements of the LED light sources on the respective electrical circuit board.

[0039] The invention is explained below by describing one embodiment together with variations with reference to the accompanying figures, wherein Fig. 1 in a perspective view a luminaire according to the invention without a cover, Fig. 2 those in the light of the Fig. 1 installed light guide plate, Fig. 3 a cover for the in Fig. 1 specified light fixture, Fig. 4a a second embodiment of a lamp according to the invention, Fig. 4b an example of how to attach the light guide plate to the housing of the luminaire Fig. 4a, Fig. 4c another example of how to attach the light guide plate to the housing of the luminaire Fig. 4a, Fig. 5 in one embodiment of a luminaire according to the invention, the fastening of the light guide plate to the cover, and Fig. Figure 6 shows a further embodiment for attaching the light guide plate to the cover and the housing of a luminaire according to the invention.

[0040] The invention is explained below with reference to a very low-profile ceiling light, as described in Fig. Figure 1 is shown in a perspective view. For clarity, a cover enclosing the light fixture 1 is shown in the illustration. Fig. 1 removed, so that a view of the other components is available.

[0041] The exemplary luminaire 1 according to the invention has a housing base plate 4 which, in its installed position, can rest against a building element, e.g., a wall or a ceiling, with an outer surface 42. A light guide plate 2, which can be made of an optical material, in particular an optical plastic material such as PMMA, is arranged on the inner surface 41 via spacers 5 spaced within the surface. In the described embodiment, the light guide plate 2, e.g., circular, can be planar with a constant thickness d and two main surfaces 20a, 20b running parallel to each other. The light guide plate 2 can extend at a distance from the housing base plate over an area that can be slightly smaller in diameter than the housing base plate 4, which is also circular in this case.

[0042] Fig. Figure 2 shows the light guide plate 2 of the luminaire 1. Fig. 1 in a single oblique view. The light guide plate 2 can here have in its volume a plurality of elongated slot recesses 22a,b and 23a,b connecting the two main surfaces 20a,b and spaced apart, which in the described embodiment extend over the entire thickness d of the light guide plate and have a recess width or slot width w.

[0043] In an embodiment not shown, the recesses may not extend over the entire thickness d of the light guide plate 2, but only with a depth < d, so that these recesses may be designed as grooves in the light guide plate 2.

[0044] To attach the light guide plate 2 to the housing base plate 4, the light guide plate can have feedthroughs 24a - d associated with the fastening screws 50, which serve to screw the light guide plate to the column-like spacers 5 on the housing base plate.

[0045] To direct light into the light guide plate, each slot 23a-d of the light guide plate is assigned a respective LED light source arrangement 8 with LEDs 80, which are arranged in a geometric and / or electrical row arrangement on an assigned electronic circuit board or circuit board 7.

[0046] According to the invention, the respective LED light source arrangement is adapted to the shape of the associated slot. In the illustrated embodiment, both the respective slot 23a-d and the respective associated LED light source arrangement, placed on an associated elongated electronic circuit board, are designed to be straight, with the LED light source arrangement 8 projecting into the associated slot 22A,B and 23A,B with respect to its LEDs 80 in the installed position, so that the light imitated by the LEDs 80 can be coupled into the light guide plate via a respective slot flank 221a,b or 222a,b and 231a,b or 232a,b, which thus act as light coupling surfaces.

[0047] In contrast to the embodiment shown in the figures, the slot recesses or the groove recesses mentioned above can also be curved. In this case, each LED light source arrangement is adapted to a curvature in its longitudinal extent, so that the curved LED light source arrangement or the electronic circuit board supporting it can be inserted into the slot to couple the light from the LEDs 80 of the respective LED light source arrangement 8.

[0048] The electronic circuit boards assigned to or supporting the respective LED light source arrangement can, for example, be designed in a strip-like shape with the greatest extent in the longitudinal dimension of the LED light source arrangement placed on it, which can be arranged on a main surface of the electronic circuit board or board 7, see Fig. 1. It may also be provided that the circuit board is fitted with LEDs on both sides, in particular in such a way that two geometric row arrangements of LEDs 80 are arranged opposite each other on the main surfaces of the electronic circuit board or circuit board 7.

[0049] In the described embodiment, a circuit board carrier 6 can be provided to hold the electronic circuit boards 7 that support the LED light source arrangements. This carrier 6 can, for example, be L-shaped. The circuit board carrier 6 can have a longitudinal extent that corresponds approximately to the longitudinal extent of the respective electronic circuit board. For example, in an embodiment where only one of the two main surfaces of the circuit board 6 is covered with an LED light source 80, the circuit board 7 can abut a corresponding contact surface of the other main surface of the circuit board carrier, thus ensuring good dissipation of the heat generated by the LED light sources. For this purpose, the material of the circuit board carrier can be optimized and can, for example, comprise or be made of metal.However, such a heat-dissipating circuit board carrier can also be used in LED lighting arrangements where both main surfaces of the electronic circuit board are covered with a geometric row arrangement of LEDs.

[0050] The arrangement of the plurality of slot recesses or slots 22a, b; 23a, b can be adapted to the respective lighting task. In the illustrated embodiment, the slot recesses, and thus, in the installed position, the associated LED light source arrangements 8, are distributed and arranged in the base area of ​​the light guide plate such that the most homogeneous light distribution possible can be generated within the light guide plate. For this purpose, it can be provided that a plurality of slot recesses 23a, b are spaced apart and arranged parallel to each other; the same applies to the other slot recesses 22a, b, whereby the parallel directions of both types of slots can be arranged approximately perpendicular to each other.

[0051] Preferably, the relative orientation of the slot recesses and thus of the associated LED light source arrangements can be designed such that one, preferably all, LED light source arrangements are illuminated with respect to both slot flanks 221a,b, 222a,b or 231a,b and 232a,b, see Fig. 2.

[0052] It should be noted that the luminaire according to the invention is not limited to a circular basic shape, i.e., a housing base plate or a light guide plate with a circular base surface; instead, other base surfaces of the light guide plate and / or housing base plate can also be used in the implementation of the invention, e.g. polygonal or oval.

[0053] As from Fig. As can be seen in Figure 1, in the described embodiment the L-shaped circuit board carriers 6 are designed with a respective fastening section 60 for fastening and support to the housing base plate 4 and with a respective support section 61, to which the respective, here strip-shaped, electronic circuit board or circuit board 7 is attached, e.g. by means of adhesive bonding and / or fastening elements 70.

[0054] To prevent direct light emission in a main direction of light, which typically runs perpendicular to the light guide plate 2, a circuit board carrier 6 can have an overhang 62 on its support section 61 associated with the electronic circuit board or circuit board. This overhang can extend approximately perpendicular to the circuit board or circuit board 6 and overlaps and thus shields the LED light source arrangement 8 or its LEDs 80. Depending on the embodiment, this overhang 62 can be located within the respective recess, particularly if the recess in the described modified embodiment is designed as a groove recess.However, as in the embodiment shown in the figures, it is also possible that the circuit board carrier extends from the housing base plate 4 beyond the light guide plate 2 and out of the associated slot opening, so that the overhang 62 lies outside the slot and covers it, lying above the light guide plate.

[0055] A person skilled in the art will recognize that the light coupled into the light guide plate 2 by the LED light source arrangements 8 can exit the plate, depending on the embodiment, in the area of ​​its end face 21 and its main surface 20a, which is the uppermost surface in the direction of light in the figure. For this purpose, these surfaces can be structured to prevent total internal reflection of the light within the plate, for example by roughening, printing, embossing, or laser marking. To prevent light loss via the main surface 20B of the light guide plate 2 facing the housing base plate 2, this main surface can, in particular, be coated or covered with a reflective material.

[0056] To generate a predetermined light distribution function of the luminaire and / or to create a predetermined appearance, the luminaire 1 according to the invention can have a cover as shown in Fig. 3 is specified with reference numeral 9. The cover 9 can be trough-shaped and have a light emission section 90 extending approximately at a constant distance from the light-emitting surface 20a of the light guide plate 2, to which a mounting section 91 adjoins in an edge section, extending approximately perpendicular to the light emission section, and which may have a circumferential, flange-like clamping section 92 at its free end section. In the installed position of the cover 9 of the Fig. 3 at the light of the Fig. 1 The clamping section 92 of the cover 9 rests on the inside of the flange 40 of the housing base plate 4, wherein the spring-elastic deflectable fastening elements 45, which are designed as clamping elements, bear against the inside of the clamping section 92 under force and in this way press the cover 9 against the flange 40, to form the completed luminaire according to the invention.

[0057] In a further embodiment, it can also be provided that the fastening elements 45 are designed as locking elements and each interact with an associated locking recess on the inside of the fastening section 91 of the cover 9 to hold the cover on the housing base plate 4.

[0058] According to the invention, it can be provided that at least one further set of components, mounted on a respective electronic circuit board, is added to the luminaire 1 according to the invention.

[0059] to provide circuit board arranged LED light source arrangements in order to modify the luminaire according to the invention and to adapt it to changed lighting tasks, e.g. with regard to the light distribution function set by the luminaire or with regard to the spectral light properties of the emitted light.

[0060] The Fig. Figures 4a - 4c show a further embodiment of a lamp 1 according to the invention in schematic diagrams. Fig. Figure 4a shows this light fixture in a side view. Fig. Figures 4b and c show exemplary attachments of the light guide plate to the housing. In this embodiment, the cover 9 is attached to the housing or the housing base plate 4 in a manner not shown. The light guide plate 2 has a reflector 11 on its main surface facing the housing base plate 4, which extends over the entire surface of the light guide plate 2 except for a peripheral section. In the unobstructed section, light can exit from the rear and leave the luminaire via the cover 9 as shown, particularly to create an indirect light component. To increase the amount of light emitted in this section, the light guide plate can be structured on its rear main surface in the designated area.

[0061] In the described embodiment, the light guide plate 2 is attached to the housing base plate 4 by means of spacers 5. The spacers 5 are not screwed to the light guide plate, but rather snapped into place. For this purpose, each spacer 5 can have an integral or additionally attached locking element in the form of a locking hook 52, which may be made of an elastic material. After the light guide plate 2 passes through an associated opening in the spacer 5, the locking hook rests against a horizontal section of the circuit board (as shown in the figure) with an associated contact surface, thus holding the circuit board to the housing base plate 4. The difference between the two embodiments of the Fig. Figures 4B and C relate solely to the lowering of the locking hook 52 into the light guide plate 2. As can be seen from the figures, in this embodiment each spacer 5 has a flange 51 facing the housing base plate 4, so that the reflector 11 and the light guide plate 2 are clamped in the installed position between the respective flange 51 and the locking hook 52.

[0062] With regard to the Fig. Figures 1 to 3 describe an embodiment in which the light guide plate 2 is attached to the housing, in particular the housing base plate. However, the design of a luminaire according to the invention is not limited to this. For example, it is possible to attach the light guide plate to the cover, while the cover itself can be attached to the housing or the housing base plate.

[0063] One such embodiment is shown in a detail and in a schematic representation. Fig. 5. In this embodiment, a contact section 93 is provided on the inside of the cover 9, against which the light guide plate 2 rests in an edge section. Furthermore, an elastic locking section 94 is provided on the inside of the cover 9, which again holds the light guide plate 2 at its main surface facing the housing base plate (not shown) in an edge section. For assembly, the light guide plate 2 can be inserted into the cover from the inside and secured by elastically deforming the section 94 in the Fig. The mounting section shown in section 5 can be inserted. Another possible way to attach the light guide plate to the housing and / or the cover is shown in [reference missing]. Fig.Figure 6 again shows a section and a schematic diagram of a luminaire designed according to the invention. The light guide plate 2 can be seen resting on a flange 40 extending, in particular perpendicularly, to the housing base plate 4. The cover 9 is designed to encompass both the housing flange 40 and the light guide plate 2, with the main surface of the light guide plate 2, acting as a coupling surface, resting against a contact section 93 of the cover. In this embodiment, the cover is fastened to the housing by means of a snap-fit ​​connection. For this purpose, the housing flange 40 and the cover 9 can each have associated snap-fit ​​elements, in particular in the form of a snap hook and a snap recess, respectively, wherein the two snap-fit ​​elements are engaged in the assembled state.In the illustrated embodiment, the flange 40 has locking hooks 46 which, in the assembled state, engage in associated locking recesses of the cover 9 to fasten the cover 9 to the housing and thus to clamp the light guide plate 2 between the housing and the cover 9. Reference symbol list 1 light 2 Light guide plates 4 Housing base plate 5 spacers 6 printed circuit board carriers / circuit board carriers 7 electronic circuit board / circuit board 8 LED light arrangement 9 Cover 11 Reflector 20a,b Main area 21 Front surface 22a,b Recess / slot recess / slot 23a,b Recess / slot recess / slot 24a,b,c,d Implementation 221a,b slot flank 222a,b slot flank 231a,b slot flank 232a,b slot flank 40 flange 41 interior surface 42 outdoor area 43 Mounting bushing 45 Fastening element 46 locking hooks 50 fastening screws 52 locking hooks 60 Fastening section 61 Support section 62 Overhang 70 Fastening element 80 LED light bulbs 90 Light emission section 91 Fastening section 92 clamping section 93 Plant section 94 elastic resting section / plant section d thickness of the light guide plate w cutout width / slot width

Claims

[1] Luminaire (1), comprising a housing, a light guide plate (2) with opposing main surfaces (20a, b) and an end face (21), wherein light from LED lamps (80) can be coupled into the light guide plate (2), and with a cover (9) which receives light emerging from the light guide plate (2) on an inner surface (41) and emits it on an outer surface (42) to produce a predetermined light distribution function of the luminaire (1), characterized bythat the light guide plate (2) has a plurality of recesses (22a, b, 23a, b) which are angled towards one another and extend from one main surface (20a, b) in the direction of the other main surface (20a, b) for at least partially receiving the LED lighting means (80) for coupling light into the light guide plate (2), and the other main surface (20a, b) and / or the end surface (21) is designed as a light coupling surface, wherein a plurality of elongated LED lighting means arrangements (8), each assigned to a recess (22a, b, 23a, b) and having a plurality of LED lighting means (80), are arranged on a respective elongated electrical. Printed circuit board (7) is arranged, and the respective illuminant arrangement (8) protrudes over its longitudinal extent into the associated recess (22a, b, 23a, b) of the light guide plate (2), so that a respective illuminant arrangement (8) is aligned with the associated recess (22a, b, 23a, b). [2] Luminaire (1) according to claim 1, characterized by that a majority of the recesses (22a, b, 23a, b) extending from the one main surface (20a, b) of the light guide plate (2), in particular all recesses (22a, b, 23a, b), have a linear extension, wherein preferably the recesses (22a, b, 23a, b) are arranged offset from one another and do not intersect. [3] Luminaire (1) according to claim 1 or 2, characterized by in that a thickness direction of a respective electrical circuit board (7) coincides with a width direction of the associated recess (22a, b, 23a, b) and a row arrangement of LED lighting means (80) of the lighting means arrangement (8) is arranged on a main surface (20a, b) of the electronic circuit board (7) that delimits the thickness of the electronic circuit board (7) for coupling light into the light guide plate (2) on a flank surface of the associated recess (22a, b, 23a, b). [4] Luminaire (1) according to claim 1, 2 or 3, characterized by that a recess (22a, b, 23a, b) of the light guide plate (2) is designed as a groove or as a slot. [5] Luminaire (1) according to claim 4, characterized by in that a shielding section is provided for an LED illuminant arrangement (8), which extends in the width direction of the recess (22a, b, 23a, b) at least as far as an emission surface of the LED illuminant arrangement (8), preferably beyond, in order to block light running in the direction of a groove base of the groove or in the slot (22a, b; 23a, b). [6] Luminaire (1) according to claim 5, characterized by that at least some of the grooves of the light guide plate (2) have an opaque shielding layer in the region of their respective groove base. [7] Luminaire (1) according to claim 5 or 6, characterized by that the shielding section is provided by the electrical circuit board (7) or by a section of a carrier of the electrical circuit board (7). [8] Luminaire (1) according to claim 5 or 7, characterized by that the shielding section is arranged behind the light guide plate (2) in the main light direction. [9] Luminaire (1) according to one of claims 1 to 8, characterized in that the housing has a plate-shaped housing section to which the light guide plate (2) is attached at a distance. [10] Luminaire (1) according to claim 9, characterized by that in the region of the spacing between the light guide plate (2) and the plate-shaped housing section of the housing, at least one electronic device of the luminaire (1) such as control electronics, electrical supply device, sensor device and / or emergency power battery device is arranged and held by the plate-shaped housing section. [11] Luminaire (1) according to one of claims 1 to 10, characterized in that an electrical circuit board (7) is assigned a circuit board carrier (6) which is fastened to the housing or is manufactured integrally with the housing for carrying the circuit board (7). [12] Luminaire (1) according to claim 11, characterized by that the circuit board carrier (6) is L-shaped with a fastening leg and a supporting leg angled thereto, which supports the electronic circuit board (7) at a free end section. [13] Lamp (1) according to one of claims 1 to 12, characterized in that the cover (9) is fastened to the housing, in particular is locked. [14] Luminaire (1) according to one of claims 1 to 13, characterized in that the cover (9) is trough-shaped, with a light-emitting section (90) and a fastening section (60) extending approximately perpendicular to the light guide plate (2) beyond the latter, to which the cover (9) is fastened to the housing. [15] Luminaire (1) according to claim 14, characterized by that the fastening section (60) of the cover (9) is projecting circumferentially from the housing and has locking sections on the inside which cooperate with complementarily designed locking sections of the housing to hold the cover (9) on the housing. [16] Luminaire (1) according to one of claims 1 to 15, characterized in that LED illuminants (80) of an LED illuminant arrangement (8) are applied to the respective electronic circuit board (7) by means of a COB technology (COB: Chip on Board). [17] Luminaire (1) according to one of claims 1 to 16, characterized bythat a reflector device, in particular a reflector element and / or a reflective coating, is arranged at least in sections on the main surface (20a, b) of the light guide plate (2) which is not arranged for light extraction. [18] Luminaire (1) according to one of claims 1 to 17, characterized by that the main surface (20a, b) of the light guide plate (2) which is not arranged for coupling out light is structured for coupling out light, in particular by printing, embossing and / or lasering this main surface (20a, b). [19] A system comprising a luminaire (1) according to any one of claims 1-18, comprising said elongated LED illuminant assemblies (8) arranged in a series arrangement on a respective elongated electrical circuit board (7) as a set, and at least one further set of elongated LED illuminant assemblies (8) arranged on a respective elongated electrical circuit board (7) for replacing the first-mentioned set, wherein the LED illuminant assemblies (8) of the sets differ with respect to the number of LED illuminants (80), the physical properties of the light emitted by the LED illuminants (80), and / or the arrangements of the LED illuminants (80) on the respective electrical circuit board (7).

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