Lighting device with releasable connected reflector

Abstract

A lighting device (100) comprises: a printed circuit board, PCB, (110), the PCB comprising a light emitting diode, LED, light source (140), the light emitting diode, LED, light source being arranged to emit LED light (150); a reflector (120); a rod-like light guide element (130) extending along a main axis A, the light guide element comprising a first end (131), a second end (132) and a side surface (160) extending from the first end to the second end, where the light guide element is arranged between the PCB and the reflector, where the PCB is arranged at the first end and the reflector is arranged at the second end, and wherein the second end comprises a recess (1321) towards the first end and the reflector is arranged to be at least partially recessed in the recess; and at least one fastening means (121, 133, 132, 1201) arranged for a releasable connection between the light guide element and the reflector.

Description

Technical Field

[0001] The present invention generally relates to lighting devices. In particular, the lighting device comprises a releasably attachable reflector having optimized optical performance. Background Art

[0002] With the introduction of new technologies such as light emitting diodes (LEDs), the field of lighting has seen rapid development. The field is in constant transformation and continues to receive attention. Compared to traditional light sources such as incandescent lamps, fluorescent lamps, neon lamps, etc., devices or equipment including LEDs offer many advantages, such as increased flexibility and control, more compact design and / or reduced power consumption. In particular, traditional light sources are being rapidly replaced by LED-based lighting technology solutions.

[0003] Light guide systems and / or devices have been disclosed in the prior art to provide light guiding and color mixing effects in lamps. However, current light guide based lamps have several disadvantages, including, for example, complex and / or cumbersome assembly of the lamp, and / or the lamp suffers from light loss, poor thermal management, disentanglement of components, etc.

[0004] It is therefore an object of the present invention to provide an alternative lighting device which preferably obviates one or more of the above disadvantages. The present invention may also have the following object: to overcome or mitigate at least one of the disadvantages of prior art lamps, or to provide a useful alternative to these lamps. Summary of the invention

[0005] In view of the above, it is of interest to provide an alternative lighting device in order to reduce the assembly complexity of the lighting device and to improve the reliability and light distribution of the lighting device. These and other objects are achieved by providing a lighting device having the features of the independent claim. Preferred embodiments are defined in the dependent claims.

[0006] Therefore, according to one aspect of the present invention, a lighting device is provided. The lighting device comprises: a printed circuit board PCB, wherein the PCB comprises a light emitting diode LED light source, which is arranged to emit LED light; and a reflector. The lighting device also comprises a rod-shaped light guide element extending along a main axis A, the light guide element comprising a first end, a second end and a side surface extending from the first end to the second end, wherein the light guide element is arranged between the PCB and the reflector, wherein the PCB is arranged at the first end and the reflector is arranged at the second end, and wherein the second end comprises a recess facing the first end, and the reflector is arranged to be at least partially recessed in the recess. The lighting device also comprises at least one fastening device, which is arranged for a releasable connection between the light guide element and the reflector.

[0007] Therefore, the present invention is based on the idea of ​​providing a lighting device, wherein the light guide element and the reflector are releasably connected via one or more fastening means. In other words, due to the characteristics of the lighting device, the complexity of assembling and / or disassembling the lighting device is reduced.

[0008] By the term "light guiding element", it is meant herein substantially any element, material, structure or the like arranged or configured to guide and / or reflect light emitted from an LED light source during operation.

[0009] According to an embodiment of the present invention, at least one fastening device comprises a snap-lock fastening device. The snap-lock fastening device comprises: a first snap-lock element, which is arranged at the second end of the light guide element; and a second snap-lock element, which is arranged on the reflector, the first snap-lock element and the second snap-lock element are matably connected. Due to this arrangement, the operation for connecting the light guide element and the reflector is simplified, resulting in a further reduction in the complexity of assembling the lighting device.

[0010] According to an embodiment of the present invention, one of the following is satisfied: (i) the first snap-on locking element comprises a male snap-on locking element and the second snap-on locking element comprises a female snap-on locking element, and (ii) the first snap-on locking element comprises a female snap-on locking element and the second snap-on locking element comprises a male snap-on locking element. Therefore, the first snap-on locking element comprises a male snap-on locking element and the second snap-on locking element comprises a female snap-on locking element, or the first snap-on locking element comprises a female snap-on locking element and the second snap-on locking element comprises a male snap-on locking element.

[0011] According to an embodiment of the invention, the first snap-locking element is arranged at the periphery of the side surface and the second snap-locking element is arranged at the top of the reflector. Due to this arrangement, the fastening device has a minimal optical impact on the lighting device, thus resulting in a uniform light distribution when the lighting device is in operation.

[0012] According to an embodiment of the present invention, at least one fastening device comprises a press-fit fastening device. The press-fit fastening device comprises one of the following: (i) a female connector arranged at the bottom of the recess and a male connector arranged at the bottom of the reflector, and (ii) a male connector arranged at the bottom of the recess and a female connector arranged at the bottom of the reflector, wherein the female connector and the male connector are matably connected. Due to this arrangement, the connection between the light guide element and the reflector is facilitated. For example, a user can conveniently push the male connector into the female connector, which significantly reduces the complexity of assembling the lighting device.

[0013] According to an embodiment of the present invention, one of the following is satisfied: (i) the female connector arranged at the bottom of the recess is a cavity arranged centrally in the recess and the male connector arranged at the bottom of the reflector is a protrusion protruding centrally from the reflector, and (ii) the female connector arranged at the bottom of the reflector is a cavity arranged centrally in the reflector and the male connector arranged at the bottom of the recess is a protrusion protruding centrally from the recess. Therefore, the female connector arranged at the bottom of the recess is a cavity arranged centrally in the recess and the male connector arranged at the bottom of the reflector is a protrusion protruding centrally from the reflector, or the female connector arranged at the bottom of the reflector is a cavity arranged centrally in the reflector and the male connector arranged at the bottom of the recess is a protrusion protruding centrally from the recess. Due to this arrangement, the light guide element and the reflector have accurate fixation and / or alignment at the bottom of the recess and the reflector. In addition, by arranging the male connector and the female connector centrally at the bottom, the optical influence of the fastening device is further reduced. Therefore, the distribution of light during operation of the lighting device is improved.

[0014] According to an embodiment of the present invention, the protrusion is polygonal, wherein the maximum width Wmax of the protrusion is greater than the diameter D of the cavity, and the minimum width Wmin of the protrusion is less than the diameter of the cavity. This embodiment is advantageous because the lighting device provides improved air circulation or exchange. In addition, the adaptation of the polygonal protrusion to the cavity enables easy fixation and ensures space for deformation, resulting in a stable press-fit effect between the light guide element and the reflector.

[0015] According to an embodiment of the invention, the reflector comprises three alignment means configured to align the reflector into the recess. This embodiment is advantageous because the accuracy of the alignment and fixation of the reflector and the recess is improved.

[0016] According to an embodiment of the invention, the reflector is conical.

[0017] According to an embodiment of the invention, the conical reflector has a vertex angle θ ranging from 50° to 90°. Due to this arrangement, the lighting device is further advantageous in that it can provide a uniform light distribution when in operation.

[0018] According to an embodiment of the present invention, the lighting device comprises an air gap arranged between the inner surface of the recess and the reflector. Due to this arrangement, light uniformity is further improved.

[0019] According to an embodiment of the present invention, the recess includes a vertex, and the air gap tapers from the vertex toward the second end of the recess. Therefore, the recess is conical and includes a vertex, so that the air gap between the recess and the reflector becomes narrower from the vertex toward the top of the recess. Due to this arrangement, different light distributions can be obtained by total internal reflection TIR and reflection R, resulting in improved light uniformity.

[0020] According to an embodiment of the present invention, at least a portion of the LED light is coupled into the light guide element at the first end as in-coupled light, the light guide element is configured to guide at least a portion of the in-coupled light as guided light to the second end based on total internal reflection TIR, wherein the lighting device is further configured to reflect at least a portion of the guided light, so that the reflected portion of the guided light is arranged to leave the lighting device via TIR at the interface between the light guide element and the air gap. Due to this arrangement, light uniformity is further improved.

[0021] According to an embodiment of the present invention, at least a portion of the bottom of the recess is flat.

[0022] According to an embodiment of the invention, the lighting device is further configured to reflect at least a portion of the guided light, so that the reflected portion of the guided light is arranged to leave the lighting device at the periphery of the light guide element via reflection R at the reflective surface of the reflector. Due to this arrangement, the light uniformity is further improved.

[0023] It will be appreciated that the lighting device of the present invention may be suitable for use in many lighting apparatuses, lamps, etc. Thus, the lighting device may be beneficial in essentially any field for lighting purposes.

[0024] According to an embodiment of the present invention, there is provided an LED lamp or a luminaire, comprising a lighting device according to any of the aforementioned embodiments. The LED lamp comprises: a housing, which at least partially surrounds the lighting device; and a base, wherein the base comprises a cap, which is arranged to mechanically and electrically connect the lighting device to a socket of the luminaire. This embodiment is advantageous because the luminaire comprising the lighting device provides light with desired characteristics such as, for example, optimal light distribution.

[0025] Further objects, features and advantages of the present invention will become apparent when studying the following detailed disclosure, the drawings and the appended claims.Those skilled in the art will realize that different features of the present invention can be combined to create embodiments other than those described in the following. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] This and other aspects of the present invention will now be described in more detail, with reference to the appended drawings showing embodiment(s) of the invention.

[0027] Figure 1 schematically shows a cross-sectional overview of a part of a lighting device according to an exemplary embodiment of the present invention,

[0028] Figure 2 schematically shows a cross-sectional view of a portion of a lighting device with guided light according to an exemplary embodiment of the present invention,

[0029] Figure 3a , Figure 3b and Figure 3c schematically shows a cross-sectional view of a portion of a lighting device including an alternative shape of a reflector and a recess according to an exemplary embodiment of the present invention,

[0030] Figure 4 schematically shows an overview of a fixed reflector with a fastening device according to a first exemplary embodiment of the invention,

[0031] Figure 5 schematically shows a detailed view of a reflector fixed to a light-guiding element by means of a fastening device according to a first exemplary embodiment of the present invention,

[0032] Figure 6 Schematically showing a bottom view of a lighting device with a fastening device according to a first exemplary embodiment of the present invention,

[0033] Figure 7 Schematically shows a top view of a lighting device with a fastening device according to a first exemplary embodiment of the present invention,

[0034] Figure 8 Schematically shows a detailed cross-sectional view of a portion of a lighting device having an air gap according to a first exemplary embodiment of the present invention,

[0035] Fig. 9 schematically shows an overview of a fixed reflector with a fastening device according to a second exemplary embodiment of the invention,

[0036] Fig.10 schematically shows a detailed cross-sectional view of a connected reflector and light guide element according to a second exemplary embodiment of the present invention,

[0037] Fig.11 schematically shows another detailed cross-sectional view of a connected reflector and light-guiding element according to a second exemplary embodiment of the present invention,

[0038] Fig.12 Schematically shows another detailed view of the bottom of the recess and the bottom of the reflector according to a second exemplary embodiment of the present invention,

[0039] Fig.13schematically shows a view of a reflector with an alignment device according to some exemplary embodiments of the present invention, and

[0040] Fig.14 A view schematically illustrating an LED lamp including a lighting device according to an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0041] Figure 1 A cross-sectional overview of a portion of an illumination device 100 according to an exemplary embodiment of the present invention is schematically shown. The illumination device 100 comprises a PCB 110 comprising an LED light source 140 arranged to emit LED light 150. It will be appreciated that the PCB 110 may comprise substantially any number of LEDs of the LED light source 140. For example, the LEDs of the LED light source 140 may be aligned in a horizontal array. According to an alternative example, the LED light source 140 may comprise at least one first LED arranged to emit white light, wherein white light means light having a wavelength range of 400nm-700nm. According to another alternative example, the LED light source 140 may comprise at least one second LED arranged to emit red light, wherein red light means light having a wavelength range of 450nm-495nm. According to another alternative example, the LED light source 140 may comprise at least one third LED arranged to emit at least one of green light and yellow light, wherein green light means light having a wavelength range of 495nm-570nm, and yellow light means light having a wavelength range of 570nm-590nm. According to another alternative example, the LED light source 140 may include at least one fourth LED arranged to emit blue light, wherein blue light means light having a wavelength range of 620nm-750nm. According to another alternative example, the white light may have a correlated color temperature in the range from 2000K to 8000K. The white light may have a color rendering index of at least 80, in particular at least 85. At least one of these LEDs emitting different light may form the LED light source 140 or be combined together to form the LED light source 140.

[0042] The lighting device 100 also includes a reflector 120, which is arranged to reflect at least a portion of the light incident thereon. The lighting device 100 also includes a rod-shaped light guide element 130, which is configured to guide the light emitted from the LED light source 140. The rod-shaped light guide element 130 may be solid or hollow. The rod-shaped light guide element 130 is preferably transparent and may preferably have a circular cross-section CS. In some embodiments, the rod-shaped light guide element 130 may be made of a polymer, such as polymethyl methacrylate PMMA, polycarbonate PC and / or polyethylene terephthalate PET. In order to further improve the effect of color mixing, in some embodiments, the length L of the light guide element 130 along the main axis A and the diameter D of the cross section CS may have a ratio R that satisfies R=L / D≥4. The length L may be defined according to the specific application. In some alternative examples, the length L is in the range from 3 cm to 12 cm. The diameter D of the cross section CS may also be defined according to the specific application. In some alternative examples, diameter D is in the range from 0.3 cm to 3 cm.

[0043] The light guide element 130 extends along a main axis A and comprises a first end 131, a second end 132 and a side surface 160 extending from the first end 131 to the second end 132. In some embodiments, the side surface 160 may include optical features and / or surface structures. The light guide element 130 is arranged between the PCB 110 and the reflector 120, wherein the PCB 110 is arranged at the first end 131 and the reflector 120 is arranged at the second end 132. The second end 132 comprises a recess 1321 towards the first end 131 and the reflector 120 is arranged to be at least partially recessed into the recess 1321. According to some embodiments, 95% of the reflector 120 is arranged to be recessed in the recess 1321. At least one fastening device 121, 133, 1328 and 1201 is arranged for a releasable connection between the light guide element 130 and the reflector 120.

[0044] Figure 2 A cross-sectional view schematically shows a portion of a lighting device with guided light according to an exemplary embodiment of the present invention. In order to explain the structure of the lighting device in detail, a cross-sectional view schematically showing a portion of a lighting device with an alternative shape of a reflector and a recess according to an exemplary embodiment of the present invention is shown. Figure 3a , Figure 3b and Figure 3cAccording to some embodiments, when the lighting device 100 is in operation, at least a portion of the LED light 150 is coupled into the light guide element 130 at the first end 131 as in-coupled light, and the light guide element 130 is configured to guide at least a portion of the in-coupled light to the second end 132 as guided light 134 based on TIR. According to some embodiments, the reflector 120 can be conical, such as Figure 3a and Figure 3b According to some other embodiments, the reflector 120 may be as shown in Figure 3c According to some other embodiments, the reflector 120 may have other shapes for specific purposes. In some embodiments, the recess 1321 may have a shape such as Figure 3a In some other embodiments, at least a portion of the concave portion 1321 is flat. In some other embodiments, in order to obtain more reflection, the concave portion 1321 may have a shape such as Figure 3b and Figure 3c According to some other examples, such as Figure 2 As shown in , the conical reflector 120 may have a vertex angle θ in the range from 50° to 90°, preferably in the range from 60° to 80°, and more preferably 70° to 74°. According to some embodiments, the width of the reflector 120 may be slightly larger, equal to, or slightly smaller than the width of the light guide 130, so that different light distributions may be obtained. According to some embodiments, the diameter of the reflector 120 is slightly smaller than the diameter of the light guide, for example 5%-30% smaller, and some of the guided light 134 is not blocked and can leave the light guide element 130 in a direction substantially parallel to the main axis A.

[0045] Figures 4 to 8 A view schematically shows a lighting device having a fastening device according to a first exemplary embodiment of the present invention.

[0046] Figure 4 schematically shows an overview of a fixed reflector with a fastening device according to a first exemplary embodiment of the invention, Figure 5 schematically shows a detailed view of a reflector fixed to a light-guiding element by means of a fastening device according to a first exemplary embodiment of the present invention, and Figure 6 and Figure 7A bottom view and a top view of a lighting device with a fastening device according to a first exemplary embodiment of the present invention are respectively shown. According to some embodiments, at least one fastening device 121, 133 comprises a snap-locking fastening device 121, 133. The snap-locking fastening device 121, 133 comprises a first snap-locking element 133 arranged at the second end of the light-guiding element 130 and a second snap-locking element 121 arranged on the reflector 120, wherein the first snap-locking element 133 and the second snap-locking element 121 are matably connected. In addition, according to some embodiments, the first snap-locking element 133 comprises a male snap-locking element, and the second snap-locking element 121 comprises a female snap-locking element. According to some alternative embodiments, the first snap-locking element 133 comprises a female snap-locking element, and the second snap-locking element 121 comprises a male snap-locking element. The first snap-locking element 133 is a detent on the light guide element 130, and the second snap-locking element 121 is a recess or a hole on the reflector 120, into which the detent snaps when the reflector 120 is fixed on the light guide element 130. According to some other embodiments, the first snap-locking element 133 is a recess or a hole on the light guide element 130, and the second snap-locking element 121 is a detent on the reflector 120, into which the detent snaps when the reflector 120 is fixed on the light guide element 130. Figure 6 and Figure 7 A bottom view and a top view of the lighting device 100 are also shown respectively.

[0047] According to some other embodiments, the fastening means 121, 133 may comprise a hermaphroditic connector. In some embodiments, the hermaphroditic connector is a hermaphroditic push-pull connector.

[0048] By having the above-mentioned fastening means 121, 133, the reflector 120 is releasably connected to the light guide element 130, which reduces the complexity of assembly or disassembly of the lighting device and at the same time avoids the disentanglement of the lighting device components, for example in the case of a lamp including the lighting device falling. In addition, this enables the possible replacement of different reflectors 120 fixed to the light guide element 130.

[0049] Figure 8 Schematically shows a detailed cross-sectional view of a portion of a lighting device with an air gap according to some exemplary embodiments of the present invention. According to some embodiments, the lighting device 100 further includes an air gap 1322 between the inner surface 1323 of the recess 1321 and the reflector 120. The formation of the air gap 1322 will be combined with Fig.10According to some embodiments, a support member 1326 may be provided at the top of the recess 1321 to support a portion of the reflector 120 , thereby ensuring that an air gap 1322 is formed between the reflector 120 and the recess 1321 of the light guide element 130 .

[0050] To further illustrate the reflection of the guided light 134, Figure 2 and Figure 3a to Figure 3c The following is elaborated in detail. According to some embodiments, the lighting device 100 is configured to reflect at least a portion of the guided light 134, such that the reflected portion of the guided light 134 is arranged to leave the lighting device 100 via TIR at an interface 1325 between the lightguide element 130 and the air gap 1322. According to some other embodiments, the lighting device 100 is further configured to reflect at least a portion of the guided light 134, such that the reflected portion of the guided light 134 is arranged to leave the lighting device 100 at a periphery of the lightguide element 130 via reflection R at a reflective surface 122 of the reflector, which Figure 3a According to some embodiments, in order to obtain different light distributions based on TIR and R, the reflector 120 may be arranged to be conical and have a vertex 1324, and the air gap 1322 between the reflector 120 and the light guide element 130 tapers from the vertex 1324 toward the top of the recess 1321. In other words, the air gap 1322 between the reflector 120 and the light guide element 130 becomes narrower from the vertex 1324 toward the top of the recess 1321, which is shown in FIG. Figure 3a According to other embodiments, when the recess 1321 has a flat bottom, there is no TIR at the interface 1325 between the light guide element 130 and the air gap 1322. The reflector 120 is thereby arranged to reflect only at least a portion of the guided light 134 incident on the reflector 120, so that the reflected light is arranged to leave the lighting device 100 at the periphery of the light guide element 130 via reflection R at the reflective surface 122 of the reflector, which is Figure 3b and Figure 3c According to some embodiments, the reflectivity of the reflector 120 is at least 80%, preferably at least 85%, more preferably at least 88%, most preferably at least 90%. According to some embodiments, the reflection is preferably diffuse reflection.

[0051] Due to the above disclosed use of the air gap 1322 and the specific reflection of the reflective surface 122, an optimal light distribution is obtained.

[0052] Figures 9 to 12 A view schematically shows a lighting device having a fastening device according to a second exemplary embodiment of the present invention.

[0053] Fig. 9schematically shows an overview of a fixed reflector with a fastening device according to a second exemplary embodiment of the invention, and Fig.10 A detailed cross-sectional view of a connected reflector and light guiding element according to a second exemplary embodiment of the present invention is schematically shown.

[0054] Fig.11 Schematically shows another detailed view of the bottom of the recess and the bottom of the reflector according to a second exemplary embodiment of the present invention. According to some embodiments, at least one fastening device 1328, 1201 includes a press-fit fastening device. The press-fit fastening device includes a female connector 1328 arranged at the bottom of the recess 1321 and a male connector 1201 arranged at the bottom of the reflector 120, wherein the female connector 1328 and the male connector 1201 are matably connectable. According to some embodiments, the female connector 1328 is a cavity in the recess 1321 and the male connector 1201 is a protrusion from the reflector 120, which is Fig.10 According to some other alternative embodiments, the press-fit fastening device 1328, 1201 includes a female connector 1328 arranged at the bottom of the reflector 120 and a male connector 1201 arranged at the bottom of the recess 1321, wherein the female connector 1328 and the male connector 1201 are matably connectable. According to some embodiments, the female connector 1328 is a cavity in the reflector 120 and the male connector 1201 is a protrusion from the recess 1321, which Fig.11 According to some embodiments, both the cavity and the protrusion are centrally arranged in the female connector 1328 and the male connector 1201. With this arrangement, the fastening means 1328, 1201 have minimal optical impact on the lighting device.

[0055] According to some other embodiments, a second gap 1329 is generated between the reflector 120 and the light guide element 130 at the bottom by the connection between the male connector 1201 and the female connector 1328. According to some embodiments, the second gap 1329 between the male connector 1201 and the female connector 1328 is larger than other gaps at the bottom portion. With this arrangement, a stable press fit is obtained between the reflector 120 and the light guide element 130.

[0056] With the above arrangement, the reflector 120 is releasably connected to the light guide element 130 , which reduces the complexity of assembly or disassembly and at the same time avoids the components from coming apart when the lamp comprising the lighting device falls, and enables possible replacement of a different reflector 120 to the light guide element 130 .

[0057] Fig.12Detailed views of the bottom of the recess and the reflector according to an exemplary embodiment of the present invention are schematically shown. According to some embodiments, the male connector 1328 may be arranged to be polygonal. In some preferred embodiments, the polygonal male connector 1328 may have at least 5 sides. According to some embodiments, the minimum width Wmin of the polygonal male connector 1201 is less than the diameter D of the female connector 1328. According to some embodiments, the maximum width Wmax of the polygonal male connector 1201 is greater than the diameter D of the female connector 1328. These arrangements improve the exchange of air and ensure space for deformation of the structure, so that the stable press fit between the reflector 120 and the optical waveguide element 130 is further improved.

[0058] Fig.13 Schematically shown are views of a reflector with alignment devices according to some exemplary embodiments of the present invention. According to some embodiments, the reflector 120 may have at least one alignment device 1202. According to some embodiments, at least one alignment device 1202 may be arranged at the top of the reflector 120, thereby ensuring accurate fixation and alignment of the reflector 120 and the light guide element 130 at the top of the recess 1321. In some preferred embodiments, there are 3 alignment devices 1202, which improves the alignment accuracy at the top of the recess 1321. In some preferred embodiments, the reflector can be fixed by aligning with the alignment devices 1302 and only being pushed into the recess 1321, which ensures that no optical contact is made between the reflector 120 and the light guide element 130, thereby creating an air gap 1322 between the inner surface of the light guide element 130 and the reflector 120.

[0059] according to Figures 4 to 8 The first embodiment shown in the figure and the corresponding embodiment described in the description can be used in accordance with Figures 9 to 13 The second embodiment shown in is combined with the embodiments described in the corresponding description.

[0060] Fig.14 FIG. 1 schematically shows a view of an LED lamp 300 including the lighting device 100 according to an exemplary embodiment of the present invention. Fig.14 According to an example, the LED lamp 300 includes: a housing 200, which at least partially surrounds the lighting device according to an exemplary embodiment of the present invention; and a base 301, wherein the base includes a cap 210, and the cap 210 is arranged to mechanically and electrically connect the lighting device to the socket of the lamp. According to some embodiments, the lamp 300 may also include a controller for specifically controlling the LEDs that emit light of different colors. According to some other embodiments, the lamp 300 may also include an antenna for wirelessly communicating with an external device such as a controller.

[0061] According to some other embodiments, a lamp is provided, comprising a housing at least partially surrounding the lighting device according to any exemplary embodiment of the present invention.

[0062] Those skilled in the art realize that the present invention is by no means limited to the preferred embodiments described above. On the contrary, many modifications and variations are possible within the scope of the appended claims. For example, one or more of the components of the lighting device 100 (such as the light guide element 130, the reflector 120, etc.) may have shapes, sizes and / or sizes different from those depicted / described.

Claims

1. A lighting device (100), comprising: a printed circuit board PCB (110), the PCB comprising a light emitting diode LED light source (140), the light emitting diode LED light source being arranged to emit LED light (150), A reflector (120), A rod-shaped light guide element (130) extending along a main axis A, the light guide element comprising a first end (131), a second end (132) and a side surface (160) extending from the first end to the second end, wherein the light guide element is arranged between the PCB and the reflector, wherein the PCB is arranged at the first end and the reflector is arranged at the second end, and wherein the second end comprises a recess (1321) facing the first end and the reflector is arranged to be at least partially recessed in the recess, and At least one fastening device (121, 133, 1328, 1201) is arranged for a releasable connection between the light guiding element and the reflector. wherein the at least one fastening device comprises a press-fit fastening device (1328, 1201), the press-fit fastening device comprising one of: (i) a female connector (1328) arranged at the bottom of the recess and a male connector (1201) arranged at the bottom of the reflector, the female connector being a cavity centrally arranged in the recess and the male connector being a protrusion centrally protruding from the reflector, and (ii) a male connector (1201) arranged at the bottom of the recess and a female connector (1328) arranged at the bottom of the reflector, the male connector being a protrusion protruding centrally from the recess and the female connector being a cavity arranged centrally in the reflector, wherein the female connector and the male connector are matably connectable, and The protrusion is polygonal, wherein a maximum width Wmax of the protrusion is greater than a diameter D of the cavity, and a minimum width Wmin of the protrusion is less than the diameter D of the cavity.

2. The lighting device according to claim 1, wherein the at least one fastening device comprises a snap-on locking fastening device (121, 133), the snap-on locking fastening device comprising: a first snap-locking element (133) arranged at the second end of the light-guiding element, and a second snap-locking element (121) arranged on the reflector, The first snap-on locking element and the second snap-on locking element are connectable in a mating manner.

3. The lighting device according to claim 2, wherein one of the following is satisfied: (i) the first snap-on locking element comprises a male snap-on locking element, and The second snap-on locking element comprises a female snap-on locking element, and (ii) the first snap-on locking element comprises a female snap-on locking element, and The second snap-on locking element comprises a male snap-on locking element. 4 . The lighting device according to claim 2 , wherein the first snap-locking element is arranged at a periphery of the side surface, and the second snap-locking element is arranged at a top of the reflector.

5. The lighting device according to any of the preceding claims, wherein the reflector comprises three alignment means (1202) configured to align the reflector into the recess.

6. A lighting device according to any of the preceding claims, wherein the reflector is conical with a vertex angle θ ranging from 50° to 90°.

7. The lighting device according to any of the preceding claims, further comprising an air gap (1322) arranged between an inner surface (1323) of the recess and the reflector.

8. The lighting device according to claim 7, wherein the recess comprises a vertex (1324), and the air gap tapers from the vertex toward a top of the recess.

9. A lighting device according to claim 7 or 8, wherein at least a portion of the LED light is coupled into the light guide element at the first end as in-coupled light, wherein the light guide element is configured to guide at least a portion of the in-coupled light as guided light (134) to the second end based on total internal reflection (TIR), and wherein the lighting device is further configured to reflect at least a portion of the guided light, such that the reflected portion of the guided light is arranged to leave the lighting device via TIR at an interface (1325) between the light guide element and the air gap. 10 . The lighting device according to claim 1 , wherein at least a portion of a bottom of the recess is flat.

11. An illumination device according to claim 9 or 10, wherein the illumination device is further configured to reflect at least a portion of the guided light, so that the reflected portion of the guided light is arranged to leave the illumination device at the periphery of the light guiding element via reflection R at the reflecting surface (122) of the reflector.

12. An LED lamp (300), comprising: A lighting device according to any one of the preceding claims, a housing (200) at least partially surrounding the lighting device, and A base (301), wherein the base comprises a cap (210), the cap (210) being arranged to mechanically and electrically connect the lighting device to a socket of a lamp.

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