LIGHT-EMITTING JOINT FOR CONNECTION OF LUMINAIRES AND LIGHTING DEVICE COMPRISING THE SAME

Abstract

 The present invention provides a light-emitting joint for connecting two or more luminaires to form a lighting device, comprising: a holder formed by a receiving chamber array comprising one or more receiving chambers connected from one another, the receiving chamber array being configured to be coupled with the two or more luminaires, a light emitting unit array comprising one or more light emitting units in a number corresponding to the number of the receiving chambers, where said one or more light emitting units are held in the respective receiving chambers in electrical connection with the luminaires, and at least two connectors, preferably mounted on a back of the lighting device, for robustly connecting the holder with the respective luminaires. The light emitting joint has the advantage of providing a uniform illumination at the junction of luminaires. The non-light emitting areas of those prior art lighting devices are reduced.

Description

Technical Field of The Invention

[0001] The present invention is generally in the technical field of lighting device, and particularly to a light-emitting joint connecting two or more adjacent luminaires and a lighting device comprising a plurality of luminaires connected by the light-emitting joints, which lighting device does not have any non-light-emitting area at a junction of the adjacent luminaires of the lighting device.

Background of The Invention

[0002] In various scenarios, LED light fixtures, as a flexible and efficient light source, are replacing conventional light fixtures. It is often that a plurality of LED luminaires are end-to-end mounted to form a LED array lighting device.

[0003] Conventionally, two or more luminaires are connected by a mechanical joint and electrically coupled together through a conductor wires. However, the areas where the mechanical joints are located are non-light emitting areas which may become non-light emitting or weak light emitting areas of the lighting device formed by connection of the two or more luminaires. The non-light emitting areas would produce weak or dark areas in the illumination pattern of the lighting device, with a result of an uneven illumination pattern. In use, the prior art lighting devices would produce an illumination pattern having dark areas that affect the illumination uniformity, with a result of poor quality of illumination of the lighting devices. This makes the lighting quality of the LED lighting device undesirable and causes an adverse effect to the visual effect and application site thereof.

[0004] Thus, there is a need for a luminaire connector that is able to conveniently electrically connect a plurality of luminaires without formation of any dark zone and is able to emit light, and for a lighting device comprising a plurality of luminaires connected by the light-emitting joints.

Summary of The Invention

[0005] An object of the present invention is to provide a light-emitting joint for two or more luminaires that is able to conveniently electrically connect a plurality of luminaires to form a lighting device, thereby eliminating the dark zones of the lighting device and producing a uniform illumination pattern. The light emitting joint enables the formation of a light emitting area at the junction of the two luminaires. The present invention also provides a lighting device comprising a plurality of luminaires connected by the light-emitting joints.

[0006] The light emitting joint of the present invention comprises a holder formed by a receiving chamber array comprising one or more receiving chambers connected from one another, the receiving chamber array being configured to be coupled with the two or more luminaires; a light emitting unit array comprising one or more light emitting units in a number corresponding to the number of the receiving chambers, where said one or more light emitting units are held in the respective receiving chambers in electrical connection with the luminaires; and at least two connectors, preferably mounted on a back of the lighting device, for robustly connecting the holder with the respective luminaires.

[0007] In one preferable embodiment of the invention, the receiving chamber array comprises a plurality of receiving chambers connected with one another, and at least two of the receiving chambers coupled with the respective luminaires by said at least two connectors respectively. More preferably, the receiving chamber array may be provided in a shape of cross, T-shape or L-shape. In some cases, the plurality of receiving chambers may be arranged to form a unitary structure.

[0008] In another specific embodiment of the invention, the receiving chamber array comprises a receiving chamber that is fabricated in a same shape as the light-emitting joint, the receiving chamber having two or more open ends coupled with the respective luminaires by said at least two connectors respectively.

[0009] In one embodiment of the invention, the light-emitting unit may comprise one or more light sources, a reflector having an inner surface which surrounds to form an interior in which the one or more light sources are arranged, a diffuser for scattering light emitted from the light sources to allow for reflection of the scattered light through the inner surface of the reflector to outside the receiving chamber. Preferably, the light sources may be selected from one or more LEDs mounted on a wiring substrate, which may be a printed circuit board such as PCBA.

[0010] In one preferred embodiment of the invention, the connector may be constructed to connect a housing of the luminaire and the receiving chamber coupled with said luminaire. It is advantageous that the receiving chamber and the housing of the luminaire may be of same shape and same contour, and the connector may be formed as a profiled element which is shaped and sized for being received in a channel defined by opposite side walls of the housing of the receiving chamber and opposite side walls of the housing of the luminaire on the back of the lighting device.

[0011] The profiled element may be screwed to a bottom plate of the housing of the luminaire and to a bottom of the receiving chamber.

[0012] In another preferred embodiment of the invention, the connector may be formed as an elongate flat joint element which is shaped and sized for insertion into a mounting groove which extends along a side wall of the housing of the luminaire and a bottom edge of the receiving chamber on the back of the lighting device. The mounting groove may be configured to have a groove width at a top end of the groove smaller than a groove width of the remainder of the groove, such that the joint element is fixedly clamped by the top end of the mounting groove in place.

[0013] Preferably, the joint element has a screw at each end thereof for tightening the joint elements to the mounting groove extending along the housing of the luminaire and the bottom edge of the receiving chamber, and the screw further comprising a screw head for pressing against the top end of the mounting groove.

[0014] A second aspect of the invention provides a lighting device comprising two or more luminaires connected from one another by the light-emitting joint of the invention.

Brief description of The Drawings

[0015] 

Fig. 1A is a top perspective view of a light emitting joint constructed consistent with a first embodiment of the invention.

Fig. 1B is a partially exploded top perspective view of the light emitting joint shown in Fig. 1.

Fig. 1C is a side view of the light emitting joint shown in Fig. 1.

Fig. 2 is a top perspective view of a T-shaped light emitting joint constructed consistent with a second embodiment of the invention.

Fig. 3 is a top perspective view of a L-shaped light emitting joint constructed consistent with a third embodiment of the invention.

Fig. 4 is a bottom perspective view showing an exemplary connector for connecting a light emitting joint and adjacent luminaires;

Fig. 5 is a bottom perspective view showing another exemplary connector for connecting a light emitting joint and adjacent luminaires;

Fig. 6 is a partial bottom view showing a light emitting joint and a luminaire in assembled state;

Fig. 7 is a partial bottom perspective view showing the light emitting joint and the luminaire of Fig. 6; and

Fig. 8 is a bottom view showing a light emitting joint for connection four luminaires in cross-shape.

Fig. 9 is a perspective view of a luminaire assembly of multiple luminaires connected by the light emitting joints in cross-shape, L-shape and T-shape.

[0016] In the various figures of the drawings, like reference numbers are used to designate like parts.

Detailed Description of The Invention

[0017] While this invention is illustrated and described in preferred embodiments, the light-emitting joint and the lighting device comprising the same may be produced in many different configurations, sizes, forms and materials.

[0018] Referring now to the drawings, Figs. 1A-1C and 2-3 show different embodiments of the light emitting joints constructed according to the invention, in which the light emitting joints are provided in the cross shape, T-shape and L-shape, respectively. Other than the shape of the light emitting joints, the structures and working principle of the light emitting joints 30, 31 and 32 are substantially the same, thus the invention disclosed herein could be applied to the light emitting joint of different shapes.

[0019] Figs. 1A, 1B and 1C illustrate in different views an exemplary light emitting joint constructed in cross shape in accordance with a first embodiment of the invention. The cross shape light emitting joint 30 comprises a holder 301 in cross shape, five receiving chambers 309 of same structure and five light emitting units 302 of same structure received in the respective receiving chamber 309. As illustrated in Figs. 1A and 1B, each of the five receiving chambers 309 is rectangular and the five receiving chambers 309 are arranged side by side to form an arrayed cross shape. In this embodiment, the five receiving chambers 309 are provided integrally to form a unitary structure of the holder 301 which also has a cross shape. The receiving chamber 309 is to provide space for accommodating the components of the light emitting unit 302.

[0020] The five receiving chambers 309 comprise four outermost receiving chambers and a central receiving chamber coupled with open ends of the four outermost receiving chambers. The opposite open ends of the four outermost receiving chambers are coupled with four luminaires, respectively. In this embodiment, each of the receiving chambers 309 is configured to have a cross section of same shape and same dimension as a cross section of the housing of the luminaire in connection with the receiving chamber 309 to achieve a linear and seamless connection.

[0021] Fig. 1B shows a top perspective view of the light emitting joint 30 as well as the exploded structure of the light emitting units 302. The light emitting unit 302 is constructed by a reflector 321, a diffuser 322 and LED light sources 310. The light emitting units 302 are mounted in the holder 301 to allow for illumination of the joint 30. As illustrated, the light emitting unit 302 is fully received in the respective receiving chamber 309 of the holder 301.

[0022] The reflector 321 comprises a reflector body comprising a relatively large top opening and a relative small bottom opening provided respectively on its top and bottom. The reflector body comprises four side walls 324 bounding around to form an inner cavity. The light emitted from a light source enters into the inner cavity, and is reflected by the reflective inner surfaces of the four side walls 324 and then irradiated through the top opening to the outside of the light-emitting joint. The resultant light would maintain uniform light intensity, i.e. the light beam exhibits an ideal illumination pattern.

[0023] The diffuser 322 is adapted to be used in cooperation with the reflector 321, and reflects the light scattered by the diffuser through the side walls of the reflector body to the outside of the light-emitting joint. The diffuser 322 is constrained on the bottom opening of the reflector. As shown in FIG. 1B, the diffuser 322 has a base, a central portion in a dome shape supported on the base, and two opposite wings extending from respective edges of the base of the diffuser 322 upward and outward to have the dome-shaped central portion therebetween. The wings are configured to be attached to respective outer surfaces of the corresponding two side walls of the reflector 321, thereby to position and securely clamp the diffuser on the bottom opening of the reflector 321. The diffuser 322 is mounted in such a manner that a central axis of the diffuser 322 is coincident with a central axis of the reflector 321.

[0024] The diffuser 322 may be molded from translucent plastic having a transmittance of between 82% and 95%. The selected plastic can have a scattering rate of between 5% and 15% at a thickness of 1 mm.

[0025] One or more LED light sources 310 (see Fig. 1C) can be in the form of LED chips, LED packages or LED arrays. The LED light sources 310 are mounted between the base and the domed center portion of the diffuser 322 and inside the cavity bounded by the dome-shaped central portion of the diffuser 322.

[0026] One exemplary light-emitting unit can be found in Applicant's pending Chinese patent CN206582546. It would be within the ability of a person skilled in the art that the light emitting unit is not restricted to the light emitting unit 302 as discussed above, and any form of light emitting unit is possible.

[0027] Fig. 1C is a side view of the light emitting joint 30. As illustrated, a partition plate 319, which is carried on two opposite sides of the receiving chamber 309, horizontally extends in the middle of the receiving chamber 309 to partition the receiving chamber 30 into an upper part and a lower part. As clearly shown, a printed circuit board (PCB) 308 such as PCBA is supported on the partition plate 319. The PCB 308 is provided for electrical connection with the luminaire for powering the LED light sources 310 which are mounted on the PCB 308. The partition plate 319 may be integral with the receiving chamber 309 or insertable between the two opposite sides of the receiving chamber 309. Preferably, the partition plate 319 is made of a thermally conductive material, such as metals like aluminum, thereby to dissipate the heat transferred from the PCB, which is generated from the LED light sources mounted on the PCB.

[0028] In another embodiment, the PCB 308 may also allow signal transmission to the light emitting unit 302 in order to have a diverse lighting effect.

[0029] In another embodiment, other than having the light emitting unit 302 located in the upper part of the receiving chamber 309, an additional light emitting unit 302 may also be located in the lower part of the receiving chamber 309. As a result, it provides illumination of the joint 20 at both of its top and bottom sides.

[0030] Fig. 2 is a top perspective view of a T-shaped light emitting joint 32, illustrating an exemplary light emitting joint constructed in T-shape in accordance with a second embodiment of the invention. Like the first embodiment discussed above, the T-shaped light emitting joint 32 comprises a T-shaped holder 301 formed by four receiving chambers 309 arranged in side by side manner, and four light emitting units 302 fully received in the four receiving chambers 309, respectively. The four receiving chambers 309 are provided integrally to form a unitary structure of the holder 301.

[0031] The receiving chambers 309 and the light emitting units 302 of this second embodiment are structurally same as the one shown in the first embodiment above, except for the shape of the joint 32, and therefore not elaborated herein.

[0032] Now turning to Fig. 3, there is illustrated a top perspective view of a L-shaped light emitting joint 31, illustrating an exemplary light emitting joint constructed in L-shape in accordance with a third embodiment of the invention. Like the first embodiment discussed above, the L-shaped light emitting joint 31 comprises a L-shaped holder 301 formed by three receiving chambers 309 arranged in side by side manner, and three light emitting units 302 fully received in the three receiving chambers 309, respectively. The three receiving chambers 309 are provided integrally to form a unitary structure of the holder 301.

[0033] The receiving chambers 309 and the light emitting units 302 of this third embodiment are structurally same as the one shown in the first embodiment above, except for the shape of the joint 31, and therefore not elaborated herein.

[0034] It would be appreciated that the light-emitting joint may comprise one receiving chamber which is fabricated such that the shape of the receiving chamber follows the contour of the light-emitting joint to illuminate the whole joint. In this case, the receiving chamber is provided with two or more open ends for coupling with the luminaries, and the number of open ends of the receiving chamber is in dependence on the number of the luminaires to be coupled.

[0035] Figs. 4 and 5 show two different connectors used for connection of the light emitting joint 30, 31, 32 and adjacent luminaires. The light emitting joint is structured to connect with at least two luminaires. For the sake of simplicity, only one receiving chamber 309 of the light emitting joint 30 is illustrated to connect with the corresponding luminaire 305.

[0036] As shown in Fig. 4, the light emitting joint 30 further comprises two connectors for each receiving chamber 309. The connector is formed as an elongated flat joint element 304a, 304b. As shown in Fig. 4, each joint element 304a, 304b is shaped and sized for insertion into and also for spanning over an mounting groove 303a, 303b provided on the bottom edge of the receiving chamber 309 on the bottom of the holder 301 and an mounting groove 307a, 307b provided on the side wall of the housing of the luminaire 305 to be connected with the receiving chamber 309 of the holder 301. The joint element 304a, 304b is inserted into the mounting grooves 303a, 307a and the mounting grooves 303b, 307b on two sides of the bottom of the receiving chamber 309 and the bottom of the luminaire 305. The joint element 304a, 304b has a longitudinal length sufficient to fasten the joint 30 and the luminaire together.

[0037] Advantageously, each of the mounting grooves 303a, 303b, 307a, 307b is configured as a groove which has a groove width at a top end of the groove smaller than a groove width of the remainder of the groove, such that the joint element 304a, 304b is well clamped by the top end of the grooves 303a, 303b, 307a, 307b in place. In such a way, the joint element 304a, 304b is tightened within the mounting grooves 303a, 303b, 307a, 307b to couple the light emitting joint 30 and the luminaire 305 together.

[0038] More advantageously, the joint element 304a, 304b further comprises a screw hole at each end thereof, and a respective screw 306a, 306b having a screw head is screwed into the screw hole at each end of the joint element 304a, 304b. After the joint element 304a, 304b is inserted into the groove 303a, 303b of the joint 30 and the groove 307a, 307b of the luminaire 305, the screw heads of the two screws 306a, 306b of the joint 30 would be in abutment against the top ends of the grooves 303a, 303b, 307a, 307b, thereby the connection of the light emitting joint 30 and the luminaire 305 will be enhanced. Preferably, the screw 306a, 306b extends into corresponding screw holes (not shown) formed on the mounting grooves of the housing of the luminaire and the bottom edge of the receiving chamber to better tighten the joint element 304a, 304b to the luminaire and the receiving chamber.

[0039] Fig. 5 illustrates another connectors used for connection of the light emitting joint 30, 31, 32 and adjacent luminaires 305. In this embodiment, the light emitting joint 30 comprises a connector which is provided as a profiled element 314 for connection with the luminaire 305. The profiled element has a substantially U-shaped configuration in transverse cross section, with two profiled sides which face one another and are joined by a base plate. The profiled element is able to mechanically connect the receiving chamber 309 of the light emitting joint 30 and an adjacent luminaire 305.

[0040] As illustrated, the profiled element 314 has a base plate 315 having four screw holes 316 in alignment, and two profiled sides 318 which extend outwardly and upwardly from respective side edges of the base plate 315. The profiled element 314 has a length sufficient for spanning over the receiving chamber 309 and the luminaire 305. The screw holes 316 allow the profiled element 314 to be fixed on the partition plate 319 disposed in the receiving chamber 309 of the light emitting joint 30 and the luminaire 305 by screws 317. Two of the screws 317 are used for fastening the profiled element 314 onto the receiving chamber 309, and the other two of the screws 317 are used for fastening the profiled element 314 onto a partition plate 319 which is arranged in the housing of the luminaire 305 and which is leveled to correspond to the partition plate 319. Preferably, the partition plate 319 of the luminaire 305 and the partition plate 319 of the receiving chamber 309 may be formed as one piece. The bottom of the housing of the luminaire 305 is removed in Figs. 5-8 to expose internal components such as the partition plate 319 for the illustrative purpose. The profiled element 314 effectively reduces the undesired tilting and swiveling of the light emitting joint 30 relative to the luminaire 305.

[0041] The profiled sides 318 of the profiled element 314 are shaped in correspondence to the two opposite sides of the housing of the luminaire 305 and the two corresponding sides of the receiving chamber 309 for insertion into the housing of the luminaire 305 and the receiving chamber 309. This would be able to additionally enhance the connection between the light emitting joint and the luminaire.

[0042] Figs .6 and 7 illustrate schematic bottom views of an assembly of the cross shape light emitting joint 30 and one luminaire 305 using the profiled element 314 as the connector for connecting the two components. As shown in Figs. 6 and 7, the profiled element 314 is fixed both on the partition plate 319 of the receiving chamber and on the partition plate 319 of the luminaire 305 by the four screws 316. As discussed above, two of the screws 316 are screwed on the partition plate 319 of the receiving chamber 309 and the other two are screwed on the partition plate 319 of the luminaire 305 to secure the light-emitting joint 30 and the luminaire 305.

[0043] Fig. 8 is a bottom view showing a light emitting joint for connection four luminaires in cross-shape. According to Figs. 7 and 8, the light emitting joint 30 takes the cross shape and is capable to connect with four luminaires 305 by four different receiving chamber 309 thereof.

[0044] As clearly shown in Fig. 7, the light emitting joint 30 is seamlessly connected to the luminaire 305. Both of the receiving chamber 309 of the light emitting joint 30 and the luminaire 305 have the same shape and cross sectional dimension at their junction, when the profiled element 314 is placed in place to robustly connect these two components. The cross sections of the light emitting joint 30 and the luminaire 305 match with each other to form a uniform structure. It enhances the appearance at the junction by providing a seamless connection.

[0045] It would be appreciated that there is no limitation that only profiled element 314 could be used for connection of the luminaires 305 with the light-emitting joint of the invention. The connection could be established by various embodiments disclosed in the present invention. For example, a combination of the profiled element and the joint element could be adopted for one single connection between the light emitting joint 30 and the luminaire 305. Also, it is applicable that the profiled element may be used for connection of one receiving chamber of the light-emitting joint with the luminaire, and the joint element may be used for another receiving chamber of the light-emitting joint with another luminaire.

[0046] It is illustrated in Fig. 8 that the four luminaires 305 connected to the light emitting joint 30 are wired together in parallel with interconnection electrical wires 330 routing through and concealed in the upper part of the light emitting joint 30, the electrical wires 330 are connected with the power terminal connectors in the luminaires 305. The light emitting units within the light emitting joint 30 are electrically connected with the PCB 308, the power needed to lit up the LED light source 31 can be obtained through a number of conventional ways, for example, through parallel connection of the PCB 308 to the electrical wires 330 of the luminaires by the terminal connectors, or parallel connection of the PCB 308 to the output of the LED Driver in one of the luminaire. Those methods are well-known in the art and are not further discussed herein.

[0047] Fig. 9 is a perspective view of a luminaire assembly of multiple luminaires connected by simultaneous use of the light emitting joints in cross-shape, L-shape and T-shape 30, 31, 32. The luminaire assembly is rigged from the ceiling with multiple anchored wires. As illustrated, the luminaires 305 each is an elongate tube having a rectangular cross section. The elongate tube comprises a plurality of receiving chambers connected to form a linear array and a corresponding number of light emitting units fully received in said receiving chambers, both of which are structurally same as the receiving chamber 309 and the light emitting unit 302 of the light emitting joint discussed above. The cross-shape, L-shape and T-shape light emitting joints 30, 31, 32 are able to spreads light evenly over the whole zone of the joints, thereby to eliminate any non-light emitting or weak light emitting areas of the luminaire assembly. Accordingly, the luminaire assembly generates a uniform light distribution or illumination pattern.

[0048] In conclusion, the light emitting joint 30, 31, 32 is provided to have one or more light emitting units 302. The lighting device formed through connecting a plurality of the luminaires 305 by the light emitting joint 30, 31, 32 allows to produce an uniform light distribution or illumination pattern without dark areas caused by non-light emitting mechanical joints in the prior art lighting devices. Therefore, the light intensity of the lighting device according to the invention remains unaffected.

Reference Signs

[0049] 

30

cross-shaped light emitting joint

31

L-shaped light emitting joint

32

T-shaped light emitting joint

301

holder

302

light emitting unit

303

mounting groove

304

flat joint element

305

luminaire

306

screw

307

mounting groove

308

printed circuit board

309

receiving chamber

310

LED light source

313

mounting groove

314

profiled element

315

base plate

316

screw hole

317

screw

318

profiled side

319

partition plate

321

reflector

322

diffuser

324

side wall

330

electrical wire

Claims

1. A light-emitting joint for connecting two or more luminaires to form a lighting device, comprising:

a holder formed by a receiving chamber array comprising one or more receiving chambers connected from one another, the receiving chamber array being configured to be coupled with the two or more luminaires,

a light emitting unit array comprising one or more light emitting units in a number corresponding to the number of the receiving chambers, where said one or more light emitting units are held in the respective receiving chambers in electrical connection with the luminaires, and

at least two connectors, preferably mounted on a back of the lighting device, for robustly connecting the holder with the respective luminaires.

2. The light-emitting joint according to claim 1, wherein the receiving chamber array comprises a plurality of receiving chambers connected with one another, and at least two of the receiving chambers coupled with the respective luminaires by said at least two connectors respectively.

3. The light-emitting joint according to claim 1 or 2, wherein the receiving chamber array is provided in a shape of cross, T-shape or L-shape.

4. The light-emitting joint according to any one of claims 1 to 3, wherein the plurality of receiving chambers are arranged to form a unitary structure.

5. The light-emitting joint according to claim 1, wherein the receiving chamber array comprises a receiving chamber that is fabricated in a same shape as the light-emitting joint, the receiving chamber having two or more open ends coupled with the respective luminaires by said at least two connectors respectively.

6. The light-emitting joint according to any one of claims 1 to 5, wherein the light-emitting unit comprises one or more light sources, a reflector having an inner surface which surrounds to form an interior in which the one or more light sources are arranged, a diffuser for scattering light emitted from the light sources to allow for reflection of the scattered light through the inner surface of the reflector to outside the receiving chamber.

7. The light-emitting joint according to claim 6, wherein the light sources are one or more LEDs mounted on a wiring substrate.

8. The light-emitting joint according to any one of claims 1 to 7, wherein the connector is constructed to connect a housing of the luminaire and the receiving chamber coupled with said luminaire.

9. The light-emitting joint according to claim 8, wherein the receiving chamber and the housing of the luminaire are of same shape and same contour, and the connector is formed as a profiled element which is shaped and sized for being received in opposite side walls of the receiving chamber and opposite side walls of the housing of the luminaire on the back of the lighting device.

10. The light-emitting joint according to claim 8 or 9, wherein the profiled element is screwed to a partition plate arranged in the housing of the luminaire and a partition plate arranged in the receiving chamber.

11. The light-emitting joint according to any one of claims 8 to 10, wherein the profiled element has a base plate having a plurality of screw holes to allow a plurality of screws for fastening the receiving chamber and the luminaire; and two profiled sides which extend outwardly and upwardly from respective side edges of the base plate, and wherein the profiled sides of the profiled element are shaped in correspondence to the two opposite sides of the housing of the luminaire and two corresponding sides of the receiving chamber for insertion into the housing of the luminaire and the receiving chamber.

12. The light-emitting joint according to claim 8, wherein the connector is formed as an elongate flat joint element which is shaped and sized for insertion into a mounting groove which extends along a side wall of the housing of the luminaire and a bottom edge of the receiving chamber on the back of the lighting device.

13. The light-emitting joint according to claim 12, wherein the mounting groove is configured to have a groove width at a top end of the groove smaller than a groove width of the remainder of the groove, such that the joint element is fixedly clamped by the top end of the mounting groove in place.

14. The light-emitting joint according to claim 13, wherein the joint element has a screw at each end thereof for tightening the joint elements to the mounting groove extending along the housing of the luminaire and the bottom edge of the receiving chamber, and the screw further comprising a screw head for pressing against the top end of the mounting groove.

15. A lighting device comprising two or more luminaires connected with one another by the light-emitting joint according to any one of claims 1 to 14.

Drawing