Lighting device comprising radar sensor unit
By introducing intermediate elements to connect the housing and surface structure in the lighting equipment and customizing the distance between the radar sensor and the light emission window, the problems of radar sensor performance and coverage area control are solved, enabling high-performance radar sensors to be applied in scenarios such as elderly care.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-10
- Publication Date
- 2026-04-14
AI Technical Summary
The performance and coverage area of radar sensors in existing lighting equipment are highly dependent on their arrangement in the product, making it difficult to achieve precise control over specific performance and coverage areas.
By introducing intermediate elements to connect the housing and surface structure in the lighting equipment, customizing the distance between the radar sensor and the light exit window, ensuring the separation of the radar sensor from the heat transfer unit, and optimizing the arrangement of the radar sensor and the surface structure, the performance of the radar sensor and the control of the coverage area are improved.
It achieves high performance and specific coverage area for radar sensors, making them suitable for applications such as elderly care, and improves the sensing accuracy and reliability of radar sensors.
Smart Images
Figure CN121866429A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a lighting device including a radar sensor unit. Background Technology
[0002] There are different types of lighting equipment, some of which are configured to be particularly useful in specific applications and are capable of providing additional functions beyond lighting. There is a desire for other types of lighting equipment that can provide functions beyond lighting to be particularly useful in specific applications. Summary of the Invention
[0003] Radar sensor technology can be used in a variety of applications. One example application is in elderly care, where radar sensors can be used to monitor a person's location and detect if they have accidentally fallen to the floor. Different ways exist to incorporate radar sensors into different types of products. However, the performance and functionality of a radar sensor can be highly dependent on how precisely it is positioned (e.g., located) within a product, as this controls the extent to which reflected electromagnetic radiation can be received by the radar sensor, which in turn determines its coverage area—that is, the area where the radar sensor can sense the presence and / or movement of objects or people.
[0004] When radar sensors are used, for example, in elderly care, it may be desirable to incorporate the radar sensor into another product to keep it invisible. One or more lighting fixtures or lamps are typically included in a room, and the radar sensor can be incorporated (e.g., integrated) into the lighting fixture, lamp, or lamp to keep it unseen. Some types of lighting fixtures are particularly well-suited for incorporating radar sensors. For example, so-called BR30 bulbs are frequently used in downlight applications and can provide sufficient space within the bulb to accommodate a radar sensor relatively easily. Lighting fixtures such as bulbs typically have a chamber defined by a light-emitting window, and one or more light sources of the lighting fixture emit light into this chamber. Light emitted by one or more light sources and transmitted through the light-emitting window can constitute the light emitted by the lighting fixture. The inventors have recognized that the distance between the radar sensor incorporated within or at the chamber of the lighting fixture and the light-emitting window can significantly control the performance and coverage area of the radar sensor.
[0005] In view of the foregoing, the present invention is concerned with providing a lighting device incorporating a radar sensor, and with respect to the lighting device, the distance between the light exit window of the lighting device and the radar sensor can be easily customized during the manufacture of the lighting device in order to achieve specific (e.g., selected) performance and coverage area of the radar sensor.
[0006] According to a first aspect of the invention, a lighting device is provided. The lighting device is configured to emit device light. The lighting device includes a housing, a light-emitting unit, and a radar sensor unit, the light-emitting unit being configured to emit light in operation, and the radar sensor unit being configured to emit and receive electromagnetic radiation in at least one wavelength range in operation. The lighting device includes a surface structure connected to the housing via an intermediate element disposed between the housing and the surface structure. The surface structure is transmissive to light and electromagnetic radiation in at least one wavelength range. The light-emitting unit is connected to the housing and configured to emit light into a cavity in operation. The cavity is defined at least partially by a surface of the surface structure and a surface of the intermediate element facing the surface structure, wherein the device light includes at least light emitted by the light-emitting unit into the cavity and transmitted through the surface structure. The radar sensor unit is connected to the intermediate element and configured to emit electromagnetic radiation in at least one wavelength range toward the surface structure into the cavity in operation, and to receive electromagnetic radiation in at least one wavelength range from the outside of the lighting device that has been transmitted through the surface structure into the cavity.
[0007] Therefore, an intermediate element is arranged between the housing and the surface structure. The intermediate element can be directly connected to the surface structure and / or the radar sensor unit, respectively. For example, the radar sensor unit can be arranged on a substrate such as a printed circuit board (PCB), and the intermediate element can be directly connected to one side of the substrate. Through the intermediate element, the tolerance overlap between the surface structure and the radar sensor unit can be kept relatively small, and the radar sensor unit can be separated from the housing. The lighting device may include a heat transfer unit comprising, for example, a heat diffuser and / or a heat sink, wherein the light-emitting unit is connected to the housing via the heat transfer unit. Through the intermediate element, the radar sensor unit can be separated from the heat transfer unit. Separation of the radar sensor unit from any heat transfer unit can help keep the radar sensor unit relatively cool during use of the lighting device, which can allow for high performance of the radar sensor unit. The intermediate element connected to the radar sensor unit facilitates the positioning of the radar sensor unit relative to the surface structure during the manufacture of the lighting device, in order to achieve a desired distance between the radar sensor unit and the surface structure along the longitudinal axis of the chamber. As described above, by achieving the desired distance between the radar sensor unit and the surface structure along the longitudinal axis of the chamber, specific (e.g., desired or required) performance and coverage area of the radar sensor unit can be achieved.
[0008] In the context of this invention, the term "connection" may be equivalent to the terms attached to, coupled to, physically contacted, mounted to, fixed to, or fastened to. The term "direct connection" refers to the connection of two elements of a lighting device to each other without any intermediate elements or components in between.
[0009] As described above, the radar sensor unit can be directly connected to the intermediate element. Furthermore, the intermediate element can be directly connected to the surface structure. Additionally, the light-emitting unit can be directly connected to the housing.
[0010] The intermediate element and the surface structure can be directly connected at their respective surfaces, which are arranged to mate with each other when joined. Such mating surfaces facilitate the manufacture of lighting devices.
[0011] The intermediate element can be directly connected to the housing, and the intermediate element and the housing can be directly connected at their respective surfaces, which are arranged to mate with each other when joined. Such mating surfaces facilitate the manufacture of lighting devices.
[0012] As described above, the lighting device may include a heat transfer unit, wherein the light-emitting unit may be connected to the housing via the heat transfer unit.
[0013] The light-emitting unit can be arranged separately from the intermediate elements, which facilitates the separation of the radar sensor unit from any heat transfer unit (e.g., a heat diffuser and / or heat sink) via which the light-emitting unit can be connected to the housing. This separation helps keep the radar sensor unit relatively cool during the use of the lighting equipment (e.g., during the use or operation of the light-emitting unit), allowing for high performance of the radar sensor unit. Therefore, the radar sensor unit can be arranged separately from the heat transfer unit.
[0014] The radar sensor unit can be arranged along the longitudinal axis of the chamber closer to the surface structure than the light-emitting unit. This configuration facilitates or ensures relatively few or even no metal components for illumination between the plane of the radar sensor unit perpendicular to the longitudinal axis and the surface structure, since the light-emitting unit typically includes metal components. The performance of the radar sensor unit can be improved by having relatively few or even no metal components for illumination between the plane of the radar sensor unit perpendicular to the longitudinal axis and the surface structure. For example, the radar sensor unit may include: a radar sensor configured to emit and receive electromagnetic radiation in at least one wavelength range during operation; and a substrate, such as a PCB, on which the radar sensor can be disposed. Similarly, the light-emitting unit may include at least one light source and a substrate, such as a PCB, on which at least one light source can be disposed. The plane of the radar sensor unit perpendicular to the longitudinal axis may coincide with or be parallel to the plane defined by the substrate on which the radar sensor unit is disposed. The substrate on which at least one light source can be disposed and the substrate on which the radar sensor can be disposed may be perpendicular to the longitudinal axis, and the substrate on which the radar sensor can be disposed may be closer to the surface structure than the substrate on which at least one light source can be disposed along the longitudinal axis. A substrate on which at least one light source can be arranged in the direction along the longitudinal axis toward the surface structure can be located below a substrate on which a radar sensor can be arranged. Thus, at least one light source, such as one or more light-emitting diodes, can be located below the substrate, and the radar sensor can be arranged on the substrate in the direction along the longitudinal axis toward the surface structure.
[0015] The radar sensor unit can be arranged along the longitudinal axis of the chamber at least 3 mm closer to the surface structure than the light-emitting unit, for example at least 5 mm closer to the surface structure, preferably at least 10 mm closer to the surface structure, and most preferably at least 15 mm closer to the surface structure.
[0016] The light-emitting unit may have a main light-emitting direction. The radar sensor unit may have a main electromagnetic radiation emission direction. The main light-emitting direction and the main electromagnetic radiation emission direction may be substantially parallel. Additionally, the main light-emitting direction and the main electromagnetic radiation emission direction may be substantially parallel to the longitudinal axis of the chamber. The difference between the main light-emitting direction and the main electromagnetic radiation emission direction may be less than 45°, for example less than 30°, and particularly less than 10°.
[0017] The radar sensor unit can be connected to an intermediate element and / or the intermediate element can be arranged such that the distance between the radar sensor unit and the surface structure along the longitudinal axis of the chamber is in the range of (e.g., approximately) 27 mm and (e.g., approximately) 30 mm. This distance can be, for example, (e.g., approximately) 27.5 mm or (e.g., approximately) 29.1 mm.
[0018] Surface structures can be configured to be translucent or light-diffusing. For example, not the entire surface structure needs to be translucent or light-diffusing, but rather a portion of the surface structure can be translucent while another portion can be light-diffusing.
[0019] At least the surface of the intermediate element (which partially defines the chamber) can be configured to be reflective of light.
[0020] The radar sensor unit can be configured to sense the presence and / or movement of an object or object near a lighting device by emitting electromagnetic radiation in at least one wavelength range toward a surface structure into a cavity and subsequently striking an object or object, and receiving electromagnetic radiation in at least one wavelength range that has been reflected from the object or object and subsequently transmitted through the surface structure into the cavity.
[0021] The light-emitting unit may include at least one light source. Each or any of the at least one light source may, for example, include a solid-state emitter, such as one or more light-emitting diodes (LEDs) and / or one or more lasers. Each or any LED may, for example, include or be composed of inorganic LEDs and / or organic LEDs (OLEDs). Solid-state light emitters are relatively cost-effective light sources because they are generally relatively inexpensive and have relatively high optical efficiency and relatively long lifetime. Examples of LEDs include semiconductor, organic or polymer / polymer LEDs, light-pumped phosphor-coated LEDs, light-pumped nanocrystal LEDs, or any other similar devices readily understood by those skilled in the art. For example, the term LED may include a bare LED die disposed in a housing, which may be referred to as an LED package. According to another example, the term LED may cover chip-scale packaged (CSP) LEDs, which may include LED dies directly attached to a substrate such as a printed circuit board (PCB) and not via sub-mounts. The term LED may, for example, include a laser diode, since a laser diode is a diode that emits light.
[0022] According to a second aspect of the invention, a luminaire or lamp is provided, which includes at least one lighting device according to a first aspect of the invention.
[0023] Other objects and advantages of the invention are described below by way of exemplary embodiments. It should be noted that the invention relates to all possible combinations of the features in the claims. Other features and advantages of the invention will become apparent when the appended claims and the description herein are examined. Those skilled in the art will recognize that different features of the invention can be combined to create embodiments different from those described herein. Attached Figure Description
[0024] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings.
[0025] Figure 1 This is a schematic partial cross-sectional view of a lighting device according to an embodiment of the present invention.
[0026] Figure 2 yes Figure 1 A schematic cross-sectional view of a portion of the lighting equipment shown.
[0027] Figure 3 This is an exploded view of a lighting device according to an embodiment of the present invention.
[0028] All accompanying drawings are schematic and not necessarily to scale, and generally only show the parts necessary to illustrate embodiments of the invention, where other parts may be omitted or merely suggested. Detailed Implementation
[0029] The invention will now be described below with reference to the accompanying drawings, in which exemplary embodiments of the invention are illustrated. However, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided by way of example, thereby conveying the scope of the invention to those skilled in the art. In the drawings, the same reference numerals denote the same or similar parts having the same or similar functions, unless otherwise specifically stated.
[0030] Figure 1 This is a schematic partial cross-sectional view of a lighting device 20 according to an embodiment of the present invention. The lighting device 20 is configured to emit device light, which is schematically indicated by arrow 21.
[0031] The lighting device 20 includes a housing 5. The housing 5 may also be described as a lower housing element or a lamp holder. The housing 5 may form at least a portion of the outer casing (i.e., outer surface) of the lighting device 20. The housing 5 may enclose additional components of the lighting device 20 (such as a driver, controller).
[0032] The lighting device 20 includes a light-emitting unit 8 configured to emit light during operation. The lighting device 20 also includes radar sensor units 3 and 4 configured to emit and receive electromagnetic radiation within at least one wavelength range during operation. This at least one wavelength range may correspond to (e.g., approximately) a frequency range between 1 Gat, and in principle, it corresponds to any suitable radar band, such as, according to IEEE (Institute of Electrical and Electronics Engineers) standards, for example, 40 GHz to 75 GHz, or 18 GHz to 27 GHz. This at least one wavelength range may, for example, correspond to a radar band according to IEEE standards including 24 GHz, or a radar band according to IEEE standards including 60 GHz.
[0033] The lighting device 20 includes a surface structure 1. The surface structure 1 is connected to the housing 5 via an intermediate element 2 disposed between the housing 5 and the surface structure 1. The surface structure 1 is transmissive at least for light (which may be emitted by the light-emitting unit 8) and for electromagnetic radiation in at least one wavelength range. Regarding the transmissive surface structure 1, at least in the context of one or more embodiments of the invention, the surface structure 1 may be referred to as a light-emitting window of the lighting device 20.
[0034] Surface structure 1 can be configured to be light-transmitting, for example by using materials and / or techniques known in the art for achieving light transmission. Surface structure 1 can also be configured to be light-diffusing, for example by using materials and / or techniques known in the art for achieving light diffusion. For example, not the entire surface structure 1 needs to be light-transmitting or light-diffusing, but rather a portion of surface structure 1 can be light-transmitting while another portion of surface structure 1 can be light-diffusing.
[0035] A light-emitting unit 8 is connected to the housing 5 and configured to emit light towards the surface structure 1 into a chamber 12 during operation, the chamber 12 being at least partially defined by the surface 13 of the surface structure 1 and the surface 14 of the intermediate element 2. Device light 21 comprises at least light emitted by the light-emitting unit 8 into the chamber 12 and subsequently transmitted through the surface structure 1. The light-emitting unit 8 may, for example, include one or more light-emitting diodes (LEDs) and / or one or more other types of light sources. At least the surface 14 of the intermediate element 2 may be configured to be reflective of light to increase the light reflectivity of the chamber 12.
[0036] Radar sensor units 3 and 4 are connected to intermediate element 2 and are configured to emit electromagnetic radiation in at least one wavelength range toward surface structure 1 into cavity 12 during operation, and to receive electromagnetic radiation in at least one wavelength range that has been transmitted through surface structure 1 into cavity 12 from outside lighting device 20.
[0037] according to Figure 1 In the illustrated embodiment of the invention, radar sensor units 3 and 4 include radar sensors 4 disposed on a substrate 3 such as a printed circuit board (PCB). However, it should be understood that a radar sensor unit may include several radar sensors, each disposed on a separate substrate, or at least some radar sensors may be disposed on the same substrate. Possibly, these radar sensors may be configured to emit and receive electromagnetic radiation in different wavelength ranges during operation.
[0038] according to Figure 1 In the embodiment of the present invention shown, radar sensor units 3 and 4 are directly connected to intermediate element 2 (more specifically, the substrate 3 of radar sensor units 3 and 4 is directly connected to intermediate element 2), and intermediate element 2 is directly connected to surface structure 1. That is, radar sensor units 3 and 4 are connected to intermediate element 2 without any intermediate elements or components in between, and intermediate element 2 is connected to surface structure 1 without any intermediate elements or components in between.
[0039] In addition, according to Figure 1 In the embodiment of the present invention shown, the lighting device 20 includes heat transfer units 6 and 7, which may include a heat sink 6 and a heat diffuser 7. The light-emitting unit 8 can be connected to the housing 5 via the heat transfer units 6 and 7, such as... Figure 1 As shown. According to Figure 1 In the embodiment of the present invention shown, the light-emitting unit 8 can be arranged separately from the intermediate element 2, which facilitates the separation of the radar sensor unit 4 from the heat transfer units 6 and 7. Therefore, the radar sensor unit 4 can be arranged separately from the heat transfer units 6 and 7.
[0040] according to Figure 1 In the illustrated embodiment of the invention, the lighting device 20 is in the form of a light bulb, such as the so-called BR30 bulb commonly used in downlight applications. However, it should be understood that the type of lighting device shown is by way of example and not limitation, and one or more embodiments of the invention can be implemented in or using other types of lighting devices.
[0041] The lighting fixture 20 can be positioned in the room, for example, such that the coverage area of the radar sensor unit 4 includes at least a portion of the room's interior. The radar sensor unit 4 can be configured to sense objects or objects in the vicinity of the lighting fixture 20, such as within the room, by emitting electromagnetic radiation of at least one wavelength range toward the surface structure 1 into the chamber 12 and subsequently striking an object or object, and by receiving electromagnetic radiation of at least one wavelength range that has been reflected from the object or object and subsequently transmitted through the surface structure 1 into the chamber 12. Figure 1The presence and / or movement of (not shown). In this way, the lighting device 20 can be used, for example, for elderly care, wherein the lighting device 20 is positioned in the room such that the coverage area of the radar sensor unit 4 of the lighting device 20 is at least a part of the room interior, and the radar sensor unit 4 is used to monitor the position of a person in the room and sense whether the person has accidentally fallen onto the floor of the room.
[0042] like Figure 1 As shown, chamber 12 may have a longitudinal axis LA. The longitudinal axis LA of chamber 12 may correspond to the longitudinal axis of illumination device 20. The longitudinal axis LA of chamber 12 may alternatively or additionally correspond to or be parallel to the main emission direction of the device light. Radar sensor unit 4 may be arranged along the longitudinal axis LA of chamber 12 closer to surface structure 1 than light-emitting unit 8.
[0043] Figure 2 yes Figure 1 A schematic cross-sectional view of a portion of the lighting device 20 shown. Figure 2 As shown, a distance L exists between the radar sensor unit 4 and the surface structure 1 along the longitudinal axis of the chamber 12. According to one or more embodiments of the invention, the radar sensor unit 4 may be connected to an intermediate element 2 and / or the intermediate element 2 may be arranged such that the distance L between the radar sensor unit 4 and the surface structure 1 along the longitudinal axis of the chamber 12 is in the range of 27 mm and 30 mm.
[0044] Figure 3 This is an exploded view of a lighting device 20 according to an embodiment of the present invention. Figure 3 and Figure 1 and Figure 2 The same reference numerals in the accompanying drawings indicate the same or similar elements or parts having the same or similar functions. Figure 1 compared to, Figure 3 More detailed views of some components of the lighting device 20 can be provided.
[0045] like Figure 3 As shown, the intermediate element 2 may have an annular shape. In view of this, and since the size and / or arrangement or construction of the intermediate element 2 can be adjusted during the manufacture of the lighting device 20 to position the radar sensor unit 4 relative to the surface structure 1 in order to achieve the desired distance between the radar sensor unit 4 and the surface structure 1 along the longitudinal axis LA of the chamber 12, the intermediate element 2 may be referred to as a range ring.
[0046] like Figure 3 As further shown, the light-emitting unit 8 may include, for example, a plurality of light-emitting diodes (LEDs) and / or another or other type of light source arranged in one or more orders on the substrate.
[0047] like Figure 3 As further shown, the lighting device 20 may include one or more substrates disposed within the housing 5. According to... Figure 3 In the embodiment of the invention shown, the lighting device 20 includes two substrates 9 and 10 disposed within a housing 5. Each of substrates 9 and 10 may, for example, include a PCB and may include circuitry such as driver circuitry for controlling the power supply to multiple light sources (e.g., LEDs) and / or for controlling the operation of the multiple light sources. Each of substrates 9 and 10 may, for example, include circuitry for processing signals generated from the conversion of electromagnetic radiation received by a radar sensor unit 4 for sensing the presence and / or movement of objects or objects near the lighting device 20.
[0048] like Figure 3 As further shown, the lighting device 20 includes a socket 11 (directly) connected to the housing 5 for, for example, electrically and mechanically connecting the lighting device 20 to a luminaire or lamp. Figure 3 (Not shown in the text)
[0049] In summary, a lighting device is disclosed, comprising a housing, a light-emitting unit, a radar sensor unit, and a surface structure connected to the housing via an intermediate element disposed between the housing and the surface structure. The light-emitting unit is connected to the housing and configured to, in operation, emit light toward the surface structure into a chamber at least partially defined by the surface of the surface structure and the surface of the intermediate element. The radar sensor unit is connected to the intermediate element and configured to, in operation, transmit electromagnetic radiation of at least one wavelength range toward the surface structure into the chamber. The surface structure is transmissive to light and electromagnetic radiation of at least one wavelength range.
[0050] Although the invention has been illustrated in the accompanying drawings and the foregoing description, such description is to be considered illustrative or exemplary, not restrictive; the invention is not limited to the disclosed embodiments. Other variations of the disclosed embodiments can be understood and implemented by those skilled in the art in practicing the claimed invention by studying the drawings, the disclosure, and the appended claims. In the appended claims, the word "comprising" does not exclude other elements or steps, and the indefinite articles "a" or "an" do not exclude a plurality. The fact that certain measures are recited in mutually different dependent claims does not imply that combinations of these measures cannot be advantageously used. Any reference numerals in the claims should not be construed as limiting the scope.
Claims
1. A lighting device (20) configured to emit device light (21), said lighting device comprising: Casing (5); The light-emitting unit (8) is configured to emit light during operation; The radar sensor unit (4) is configured to transmit and receive electromagnetic radiation in at least one wavelength range during operation; as well as A surface structure (1) is connected to the housing via an intermediate element (2) disposed between the housing and the surface structure, the surface structure being transmissive to at least the device light and to electromagnetic radiation within the at least one wavelength range; The light-emitting unit is connected to the housing and configured to emit light into a chamber (12) during operation, the chamber being at least partially defined by a surface (13) of the surface structure and a surface (14) of the intermediate element facing the surface structure, wherein the device light comprises at least light emitted by the light-emitting unit into the chamber and transmitted through the surface structure. The radar sensor unit is connected to the intermediate element and configured to, during operation, emit electromagnetic radiation within the at least one wavelength range toward the surface structure into the cavity, and receive electromagnetic radiation within the at least one wavelength range from outside the lighting device that has been transmitted into the cavity through the surface structure. The radar sensor unit is arranged along the longitudinal axis (LA) of the chamber closer to the surface structure than the light-emitting unit.
2. The lighting device according to claim 1, wherein the radar sensor unit is directly connected to the intermediate element.
3. The lighting device according to any one of the preceding claims, wherein the intermediate element is directly connected to the surface structure.
4. The lighting device of claim 3, wherein the intermediate element and the surface structure are directly connected at their respective surfaces, and the respective surfaces of the intermediate element and the surface structure are arranged to mate with each other when engaged.
5. The lighting device according to any one of the preceding claims, wherein the intermediate element is directly connected to the housing, and wherein the intermediate element and the housing are directly connected at their respective surfaces, the respective surfaces of the intermediate element and the housing being arranged to mate with each other when engaged.
6. The lighting device according to any one of the preceding claims, wherein the light-emitting unit is arranged separately from the intermediate element.
7. The lighting device according to any one of the preceding claims further includes a heat transfer unit (6, 7), wherein the light-emitting unit is connected to the housing via the heat transfer unit.
8. The lighting device according to claim 7, wherein the radar sensor unit is arranged separately from the heat transfer unit.
9. The lighting device according to any one of the preceding claims, wherein the light-emitting unit (8) has a main light-emitting direction, wherein the radar sensor (4) unit has a main electromagnetic radiation emission direction, and wherein the difference between the main light-emitting direction and the main electromagnetic radiation emission direction is less than 30°.
10. The lighting device according to any one of the preceding claims, wherein the radar sensor unit is connected to the intermediate element, and / or the intermediate element is arranged such that the distance (L) between the radar sensor unit and the surface structure along the longitudinal axis (LA) of the chamber is in the range of 27 mm and 30 mm.
11. The lighting device according to any one of claims 1 to 10, wherein the surface structure is configured to be light-transmitting.
12. The lighting device according to any one of claims 1 to 10, wherein the surface structure is configured to diffuse light.
13. The lighting device according to any one of the preceding claims, wherein the surface (14) of at least the intermediate element that at least partially defines the chamber is configured to be reflective of light.
14. The lighting device according to any one of the preceding claims, wherein the radar sensor unit is configured to sense the presence and / or movement of an object or object near the lighting device by: emitting electromagnetic radiation in the at least one wavelength range toward the surface structure into the cavity and so as to subsequently impact the object or object; and receiving electromagnetic radiation in the at least one wavelength range that has been reflected from the object or object and subsequently transmitted through the surface structure into the cavity.
15. A luminaire or lamp comprising at least one lighting device according to any one of claims 1 to 14.