A control unit for a luminaire

Abstract

A control unit (150) for a luminaire. The control unit (150) is designed to fit into a gap or opening (115) of a lamp (110) of a luminaire. The control unit (150) comprises two or more object detection sensors (154A, 154B,. 154C, 154D) arranged around a central axis (A1) of the luminaire and around one or more auxiliary light sources (153) of the luminaire. A support element (151) of the control unit (150) fits into the gap or opening (115). A controller (155) of the control unit (150) receives object detection data from the object sensors (154A, 154B, 154C, 154D), and produces one or more output signals for provision to the lamp (110) via a signal output interface.

Description

[0001] 2025PF80126

[0002] 1

[0003] A CONTROL UNIT FOR A LUMINAIRE

[0004] FIELD OF THE INVENTION

[0005] The present invention relates to the field of lighting, and in particular, to control units for a luminaire.

[0006] BACKGROUND OF THE INVENTION

[0007] There is a worldwide increase in the use and reliance upon artificial lighting, such as luminaires.

[0008] Traditional luminaires typically comprise a lamp (i.e., light source) and a simple on / off switch, limiting their adaptability to different environmental conditions and user needs. As lighting technology has advanced, there has been a growing demand for more intelligent and responsive lighting solutions.

[0009] A known form of luminaire will, in addition to or in place of the on / off switch, comprise a control unit for controlling the operation of the lamp or module. A typical control unit comprises a controller that generates one or more output signals for the lamp and one or more sensor and / or communication modules for producing control data that the controller uses to define the operational state of the lamp. A simple example of a sensor module is a motion sensing module, which the control unit uses to activate the lamp when motion is detected.

[0010] There is an ongoing desire to improve luminaires, particularly to provide a luminaire with a compact control unit, whilst maintaining accuracy in any sensing and / or communications. It would also be desirable to improve the functionality of a control unit.

[0011] SUMMARY OF THE INVENTION

[0012] The invention is defined by the claims.

[0013] According to examples in accordance with an aspect of the invention, there is provided a control unit for a luminaire having a lamp for illuminating an environment. The control unit comprises: a support element shaped to fit into an opening defined by the lamp of the luminaire and having a front side for facing the environment; one or more auxiliary light sources, positioned on the front side of the support element, for illuminating the environment;2025PF80126

[0014] 2

[0015] two or more object detection sensors, each configured to generate object sensor data indicating whether or not a subject is present within a respective field-of-view in the environment, wherein the two or more object detection sensors are arranged around a central axis of the control unit and around the one or more auxiliary light sources; a controller configured to receive the object sensor data from each object detection sensor and generate one or more output signals for the lamp of the luminaire responsive to the object sensor data from each object detection sensor; and a signal output interface configured to connect to the lamp for providing the one or more output signals to the lamp of the luminaire.

[0016] The present disclosure proposes a control unit that is receivable within an opening or gap of a lamp of a luminaire. The control unit one or more auxiliary light sources (e.g., for supplementing the lamp) and a plurality of object detection sensors (e.g., two or more object detection sensors) that are arranged around a central axis of the control unit and around the auxiliary light source(s).

[0017] The control unit also provides a controller that controls the operation of the lamp at least using object sensor data produced by the object detection sensors. Accordingly, the control unit comprises a signal output interface for connecting to the lamp and providing the output signal(s) to the lamp.

[0018] A control unit that fits within the lamp opening allow for integration the luminaire structures without altering its overall form factor. The arrangement of multiple object detection sensors around the central axis and auxiliary light sources may provide comprehensive coverage of the surrounding environment. The inclusion of auxiliary light sources on the front side of the support element enables supplementary illumination, which may be useful for enhancing visibility in specific areas or providing low-level lighting when the main lamp is off.

[0019] The positioning of the object detection sensors around the central axis and the auxiliary light source(s) allows for improved spatial distribution of sensing capabilities while minimizing interference between the sensors.

[0020] In some examples, the lamp is an annular lamp that surrounds a central aperture, and the opening defined by the lamp is the central aperture. This configuration allows seamless integration of the control unit into circular luminaire designs, maximizing space utilization while maintaining the aesthetic appeal of the lighting fixture. The annular lamp arrangement also enables uniform illumination distribution of the environment around the central control unit.

[0021] In some examples, each object detection sensor is a time-of-flight, ToF, sensor.2025PF80126

[0022] 3

[0023] Time-of-flight sensors provide precise distance measurements and rapid subject detection, enabling highly responsive and accurate control of the lamp.

[0024] In some examples, each time-of-flight sensor defines a sensing direction, being the direction that extends along a central axis of the field-of-view associated with said time-of-flight sensor. In some examples, an angle between the sensing direction of two adjacent time-of-flight sensors is set to 360° divided by the number of time-of-flight sensors in the control unit.

[0025] In some examples, each time-of-flight sensor defines a tilting angle, wherein a tilting angle is an angle between the sensing direction of the time-of-flight sensor and the central axis of the control unit. The tilting angle of each time-of-flight sensor may be non-zero.

[0026] In some examples, for each time-of-flight sensor, the tilting angle of each time-of-flight sensor is a predetermined proportion of a field-of-view angle, being an angle of view of the time-of-flight sensor. In some examples, where the control unit comprises (e.g., exactly) three time-of-flight sensors, the predetermined proportion is one-third. In some examples, where the control unit comprises (e.g., exactly) four time-of-flight sensors, the predetermined proportion is half.

[0027] In some examples, the control unit further comprises a radar sensor configured to generate radar sensor data of the environment, wherein the two or more object detection sensors are arranged around the radar sensor. The addition of a radar sensor complements the ToF sensors by providing wider area coverage and the ability to provide an independent or cross-check detection of subject presence. This multi-sensor approach enhances the system's ability to accurately detect and / or track subjects in the environment.

[0028] In some examples, the one or more auxiliary light sources comprise one or more first auxiliary light sources arranged around the radar sensor. This arrangement reduces a risk that the auxiliary lighting will interfere with the radar sensor's operation while providing auxiliary illumination of the environment. It also creates a visually balanced design that integrates sensing and lighting functions.

[0029] In some examples, the control unit further comprises an ambient light sensor for generating ambient light sensor data, wherein the two or more object detection sensors are arranged around the ambient light sensor. The inclusion of an ambient light sensor allows the system to adjust lighting levels (of the lamp and / or auxiliary light source(s)) responsive to ongoing or actual existing environmental conditions, facilitating more complex control techniques for improved energy usage and user comfort.2025PF80126

[0030] 4

[0031] The one or more auxiliary light sources may be configured to emit light responsive to the ambient light sensor data. In particular, the controller may be configured to control the operation of each auxiliary light sources responsive to the ambient light sensor data, e.g., to activate each ambient light source responsive to a detected ambient light level (indicated in the ambient light sensor data) falls below a predetermined ambient light threshold.

[0032] In some examples, the control unit further comprises a diffuser positioned to cover at least the one or more auxiliary light sources and expose the two or more object detection sensors. A diffuser improves the uniformity of light emitted by the auxiliary light source(s). Moreover, by exposing the object detection sensors, the diffuser design maintains their functionality, reducing a risk of interfering with the operation of the object detection sensor via diffusing of any signals produced and / or received by the object detection sensor.

[0033] In some examples, the two or more object detection sensors are arranged around the diffuser. This arrangement helps maintain maintaining clear lines of sight for the object detection sensors.

[0034] In some examples, the diffuser comprises a top surface and a side surface, wherein a thickness of the top surface is different to a thickness of the side surface. Varying the thickness of the diffuser surfaces allows for customized light distribution patterns using a single diffusive component. In particular, two different and distinct emissions of light (originating at the auxiliary light source(s)) can be achieved.

[0035] In some examples, the control unit further comprises a mechanical connector configured to connect the control unit to the lamp of the luminaire. This ensures secure and reliable attachment of the control unit to the luminaire, simplifying installation and maintenance processes.

[0036] In some examples, the control unit further comprises a heat sink arrangement directly coupled to the two or more object detection sensors, wherein, in use, the heat sink arrangement extends away from the environment. The integrated heat sink manages thermal output from the sensors and electronic components, ensuring optimal performance and longevity of the control unit. By extending away from the environment, it reduces a risk of the control unit extending outside the envelope of the lamp, to provide a more compact luminaire.

[0037] In some examples, a front side of the support element is circular. A circular front design complements the annular lamp configuration, whilst also facilitate an even distribution of object detection sensors and any auxiliary light sources around the perimeter central axis of the control unit.2025PF80126

[0038] 5

[0039] In accordance with another proposed approach, there is provided a luminaire comprising: the control unit as described above; and the lamp positioned to at least partially surround the control unit, wherein the lamp comprises one or more primary light sources and is configured to control the light emitted by each primary light source responsive to the one or more output control signals.

[0040] In some examples, the lamp is an annular lamp positioned to surround the central unit. The annular lamp configuration creates a uniform light distribution around the central control unit, improving illumination coverage while maintaining a compact luminaire design.

[0041] In some examples, the lamp comprises a lampshade configured to cover the one or more primary light sources and mechanically engage with the support element of the control unit.

[0042] The luminaire may further comprise a fixing ring configured to: mechanically clip to the support element of the control unit; and when clipped to the support element of the control unit, press against the lampshade of the lamp to maintain a shape of the lampshade over time.

[0043] The fixing ring functions to maintain a positional relationship between the control unit and the lampshade of the lamp, e.g., over time, by pressing against the lampshade of the lamp, e.g., using the control unit as a bracing element. This reduces a risk of the illumination pattern from the lamp undesirably changing over time (e.g., due to sagging, gravity and / or vibration(s)).

[0044] These and other aspects of the invention will be apparent from and elucidated with reference to the embodiment s) described hereinafter.

[0045] BRIEF DESCRIPTION OF THE DRAWINGS

[0046] For a better understanding of the invention, and to show more clearly how it may be carried into effect, reference will now be made, by way of example only, to the accompanying drawings, in which:

[0047] Figure 1 provides an exploded view of a proposed luminaire;

[0048] Figure 2 illustrates a cross-sectional view of a portion of a proposed luminaire; Figure 3 shows a perspective view of a control unit for a luminaire;

[0049] Figure 4 conceptually illustrates definable angles for an object detection sensor; Figure 5 illustrates cross-sections of the field-of-view of the object detection sensor in a plane orthogonal to a sensing direction;2025PF80126

[0050] 6

[0051] Figure 6 provides a top-down view of the field-of-view of the object detection sensor;

[0052] Figure 7 illustrates exemplary fields-of-view for four object detection sensors of a proposed control unit;

[0053] Figure 8 illustrates exemplary fields-of-view for three object detection sensors of another proposed control unit;

[0054] Figure 9 illustrates a portion of a proposed control unit; and

[0055] Figure 10 provides a cross-sectional view of a portion of a proposed luminaire.

[0056] DETAILED DESCRIPTION OF THE EMBODIMENTS

[0057] The invention will be described with reference to the Figures.

[0058] It should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the apparatus, systems and methods, are intended for purposes of illustration only and are not intended to limit the scope of the invention. These and other features, aspects, and advantages of the apparatus, systems and methods of the present invention will become better understood from the following description, appended claims, and accompanying drawings. It should be understood that the Figures are merely schematic and are not drawn to scale. It should also be understood that the same reference numerals are used throughout the Figures to indicate the same or similar parts.

[0059] The invention provides a control unit for a luminaire. The control unit is designed to fit into a gap or opening of a lamp of a luminaire. The control unit comprises two or more object detection sensors arranged around a central axis of the luminaire and around one or more auxiliary light sources of the luminaire. A support element of the control unit fits into the gap or opening. A controller of the control unit receives object detection data from the object sensor data, and produces one or more output signals for provision to the lamp via a signal output interface.

[0060] In the context of the present disclosure, the term "annular" refers to a shape that is ring-like or forms a closed loop, but does not necessarily imply a perfect circle. An annular shape may thereby include various geometric forms (e.g., circles, ovals, ellipses, or even polygonal shapes) that create a continuous loop with an opening in the center.

[0061] Figure 1 provides an exploded view of a proposed luminaire 100, for the purposes of improved contextual understanding. The luminaire 100 comprises a lamp 110 and a control unit 150. The control unit 150, and the luminaire 100 comprising the control unit 150, both represent herein proposed embodiments.2025PF80126

[0062] 7

[0063] The lamp 110 is designed for illuminating an environment. Accordingly, the lamp 110 may comprise one or more primary light sources 111 configured to emit light for illuminating the environment. It will be appreciated that the lamp 110 has a front face 110A that faces the environment and via which the environment is illuminated by the lamp 110.

[0064] The primary light source may, for instance, comprise a plurality of individual primary lighting elements arranged around a lamp axis AL. The lamp axis may, for instance, be an axis that extends through the center of the lamp 110 and is substantially perpendicular to the front face 110A of the lamp. The primary lighting elements may be arranged in a circular or (e.g., non-circular) annular pattern around this lamp axis AL to provide uniform illumination of the environment.

[0065] The lamp 110 defines an opening 115. The lamp 110 at least partially surrounds the opening 115, which opening may be embodied as a gap, aperture and / or cavity.

[0066] In the illustrated example, the lamp 110 has an annular shape (i.e., is an annular lamp) and the opening 115 is the aperture defined by the center of the annular shape. In other words, the illustrated lamp 110 wholly or fully surrounds the opening.

[0067] In other example, the lamp 110 has a non-annular shape, but may still comprise an opening at the center of its shape. This still provides a lamp that wholly or fully surrounds the opening.

[0068] In another example, the lamp may have an opening (e.g., a through opening) that is positioned off-center. The lamp may fully surround such an opening, e.g., located closer to one corner or edge of the rectangular lamp body than another corner or edge of the lamp. This arrangement could be useful for wall-mounted or comer luminaires, where a side-positioned opening may allow for more efficient placement of sensors or auxiliary light sources.

[0069] In another example, the opening is formed at the side of the lamp or at another location that does not require the lamp to fully surround the opening, rather the lamp may only partially surround the opening.

[0070] The control unit 150 comprises a support element 151 shaped to fit into the opening. The support element 151 serves as the primary structural component of the control unit 150, and is designed to fit into the opening 115 of the lamp 110. This design allows for efficient integration of the control unit within the luminaire structure.

[0071] The support element 151 has a front side 151 A that faces the environment. Thus, the front side 151 A of the support element may face a same direction as the front face 110A of the lamp 110.2025PF80126

[0072] 8

[0073] At least when the opening 115 has a circular cross-sectional shape (e.g., takes the form of a cylinder or conical frustum), a front side 151 A of the support element 151 may be circular. This facilitate a seamless integration with the lamp 110. A circular design also facilitate efficient placement of one or more sensors of the control unit 150.

[0074] Further components 152 (illustrated in stippling) of the control unit will be described later, for the sake of illustrative clarity. At least some of the further components are positioned on the front side 151 A of the support element, such that they will have (direct) exposure to the environment to be illuminated by the luminaire.

[0075] In some examples, the control unit fits entirely within the bounds or limits of the opening defined by the lamp. In other words, the control unit may be configured to not protrude beyond the lamp's profile. Put another way, the control unit 150 may be recessed from a front face 110A of the lamp 110, i.e., recessed within the structure of the lamp 110.

[0076] In this way, the control unit 150 may, in the assembled luminaire 100, be completely contained within an envelope of the lamp 110.

[0077] This configuration helps to reduce the overall footprint of the luminaire, as well as reducing a risk that light emitted from the front face 110A of the lamp 110 will impact any sensors or other modules of the control unit. Moreover, this arrangement provides improved protection for the control unit.

[0078] Further (optional) elements of the lamp 110 are hereafter described for illustrative clarity.

[0079] The lamp 110 may comprise a lampshade 112 configured to cover the one or more primary light sources 111. An exterior surface of the lampshade 112 may define the front face 110A of the lamp 110. The opening 115 may be defined by an opening in the lampshade 112 (as illustrated). Thus, in the illustrated example, the lampshade 112 is an annular lampshade that surrounds the opening 115, defining the limits or bounds of the opening 115.

[0080] The lamp 110 may comprise a lamp support 113, also known as a base. The lamp support is configured to mount or support the primary light source(s) 111 of the lamp 110. It will be appreciated that, where present, the lampshade 112 may connect (e.g., clip or otherwise secure) to the lamp support 113 when the lamp is assembled. By way of example, the lamp shade may connect to the lamp support 113 (i.e., the base) by a rotating clip.

[0081] The lampshade 112 may (also) be configured to mechanically engage with the support element of the control unit, as later exemplified. This helps to properly position the lampshade relative to the components of the control unit and / or secure the control unit to the remainder of the luminaire.2025PF80126

[0082] 9

[0083] The lamp support 113 may also be configured to engage with or otherwise mount the control unit 150, e.g., via a mounting element 114 of the lamp support. In this way, the lamp support 113 may function or serve as a base for the overall luminaire, supporting the primary light source(s) 111, the lampshade 112 and the control unit 151.

[0084] The lamp support 113 may comprise one or more mounting components for securing the lamp support, and by extension the overall luminaire, to a surface such as a ceiling. These mounting components may include brackets, hooks, screws, or other fastening mechanisms designed to provide a stable and secure attachment.

[0085] In some examples, the luminaire 100 further comprises a fixing ring 160. The fixing ring is designed to mechanically clip to the support element 151 of the control unit and engage with the lamp 100 (e.g., the lampshade 112) of the lamp. A suitable example of a fixing ring will be explained in more detailed later.

[0086] Figures 2 and 3 illustrate a proposed control unit 150 for the luminaire. The proposed control unit is itself an embodiment of the invention. Figure 2 provides a first, fronton view of the control unit 150 and Figure 3 provides a cross-sectional side view of the control unit 150.

[0087] The control unit 150 comprises the support element 151, one or more auxiliary light sources 153, two or more object detection sensors 154A, 154B, 154C, 154D and a controller 155. The auxiliary light source(s), the object detection sensors and the controller form at least some of the further components of the control unit previously mentioned.

[0088] The support element 151 is shaped to fit into an opening defined by the lamp of the luminaire (see Figure 1).

[0089] The one or more auxiliary light sources 153 are positioned on the front side 151 A of the support element 150. The auxiliary light sources are configured for illuminating the environment, i.e., from a front of the control unit. The auxiliary light sources may comprise LEDs or other suitable light-emitting devices. Their positioning on the front side of the support element facilitates direct exposure to or illumination of the environment.

[0090] In the illustrated example, the one or more auxiliary light sources 153 comprises a plurality of auxiliary light sources that are circularly arranged around a central axis Al of the control unit. The central axis is understood to be an imaginary or hypothetical line passing through the center of the control unit, substantially perpendicular to the front side of the support element, e.g., bisecting the control unit.

[0091] The two or more object detection sensors 154 A, 154B, 154C, 154D are each configured to generate object sensor data. The object sensor data indicates whether or not a2025PF80126

[0092] 10

[0093] subject is present within a (respective) field-of-view (FOV) in the environment. In this context, a field-of-view or FOV represents the observable region of the environment that is detectable to the corresponding object detection sensor.

[0094] Each object detection sensor may be formed of any suitable sensor for capturing data that changes responsive to the presence or absence of one or more subjects with their respective fields of view. Examples include infrared sensors, ultrasonic sensor or optical sensors. In some examples, each object detection sensor is a respective time-of-flight sensor.

[0095] The two or more object detection sensors are arranged around a / the central axis Al of the control unit 150 and around the one or more auxiliary light sources.

[0096] In particular the object detection sensors may be circularly arranged (e.g., arranged in a circle or ring) around the central axis. In some examples, the object detection sensors are evenly distributed around the central axis, such that an angular position of each object detection sensor around the central axis is a multiple of 360° divided by the number of object detection sensors (e.g., with respect to a reference angular position). An angular position refers to the location of an object or component in relation to a central point or axis, expressed as an angle from a reference direction.

[0097] More specifically, where n is the number of object detection sensors, a j-th object detection sensor may be positioned at an angular position of (j-l)*360 / n degrees. Thus, in a configuration with four object detection sensors (n = 4), the sensors would be positioned at 0°, 90°, 180°, and 270° around the central axis. Similarly, in a configuration with three object detection sensors (n = 3), the sensors would be positioned at 0°, 120° and 240° around the central axis.

[0098] The angular positioning helps to reduce potential interference between adjacent sensors by maintaining consistent spatial separation.

[0099] Arranging the object detection sensors around the auxiliary light sources reduces a risk that the object detection sensors are obstructed by the light sources, allowing each sensor to have a clear line of sight to its respective field-of-view in the environment.

[0100] In particular, this arrangement facilitates the positioning of each of the object detection sensors as far from the center axis as possible, to mitigate crosstalk from other sensors. In this way, interference between sensors can be reduced whilst working within the physical limitations of the sensor unit (and therefore the size of the opening).

[0101] The controller 155 is configured to receive the object sensor data from each object detection sensor 154 A, 154B, 154C, 154D.2025PF80126

[0102] 11

[0103] The controller is configured to generate one or more output signals for the lamp of the luminaire responsive to the object sensor data from each object detection sensor. Approaches for generating output signals for controlling an operation of a lamp using object sensor data are well known in the art, and the precise mechanism employed by the controller is immaterial to the present disclosure.

[0104] For instance, the controller may be configured to process the object sensor data to predict whether or not the environment is occupied by a subject. Responsive to predicting that the environment is occupied, the controller may generate one or more output signals for activating or increasing the intensity of the lamp.

[0105] As another example, the controller may be configured to process the object sensor data to predict whether or not a subject in the environment has undergone a fall. Responsive to predicting that the subject has undergone a fall, the controller may generate one or more output signals for changing the color of the lamp to indicate an emergency situation.

[0106] As yet another example, the controller may be configured to process the object sensor data to predict whether or not a subject in the environment is moving (e.g., indicating they are awake). Responsive to predicting that the subject is moving, the controller may generate one or more output signals for adjusting the brightness or color temperature of the lamp to provide appropriate lighting conditions for the subject's activity level.

[0107] Further examples will be readily apparent to the skilled person, and are not detailed for the sake of conciseness.

[0108] The controller may be embodied using one or more processors, memory devices, and / or other hardware components. The controller may include a processor for executing instructions stored in memory to perform the various functions described.

[0109] The controller may be offset from any sensor(s) and / or the auxiliary light source(s) of the control unit. This allows for better thermal management by separating the heatgenerating components (sensors and light sources) from the controller, which may be sensitive to temperature fluctuations. This arrangement also provides more space on the front side of the control unit for the sensors and auxiliary light source(s), enabling appropriate placement for their respective functions. This arrangement recognizes that there is no requirement for the processor to be positioned nearer to the front side of the control unit. Furthermore, situating the processor away from the front side improves its protection from external environmental factors, potentially increasing the longevity and reliability of the control unit.

[0110] The control unit 150 further comprises a signal output interface 156 configured to connect to the lamp for providing the one or more output signals to the lamp of the luminaire.2025PF80126

[0111] 12

[0112] The signal output interface is thereby configured to facilitate the transmission of the output signal(s) generated by the controller 155 to the lamp.

[0113] In particular, the control unit 150 may comprise, for each output signal, a respective output contact for electrically connecting to (e.g., a signal input interface of) the lamp of the luminaire. The signal output interface 156 may comprise or define a wired connection using one or more standard protocols such as DALI (Digital Addressable Lighting Interface), 0-10V, 1-10V, or DMX (Digital Multiplex) for communicating with the lamp.

[0114] Alternatively, the signal output interface 156 may comprise a wireless communication module configured to employ one or more wireless communication technologies (such as Bluetooth ®, Wi-Fi ®, or Zigbee ®) for communicating with the lamp.

[0115] More particularly, the signal output interface of the control unit and a corresponding signal input interface of the lamp may be configured to form a compatible and connectable terminal pair, e.g., to define a quick-connect plug.

[0116] The signal output interface may comprise, for each output signal, a respective signal isolation component connected between the controller and respective output contact of the signal output interface.

[0117] The signal isolation component is configured to galvanically isolate the controller from the respective output contact, to provide EMI immunity and improved compatibility with different luminaires. A suitable example of a signal isolation component is an optocoupler or opto-isolator, although other examples are known in the art (such as magnetic or capacitive coupling isolators).

[0118] The signal output interface may also be configured to provide and / or receive one or more power signals. In this way, the signal output interface may incorporate power transmission capabilities alongside its communication functions. This arrangement allows for the transfer of electrical power between the control unit and the lamp.

[0119] For instance, the signal output interface may be designed to supply power to the lamp, enabling the control unit to regulate not only the lamp's operation but also its power delivery. Conversely, the signal output interface may be configured to receive power from the lamp (or another power source).

[0120] In some cases, the power signals may be transmitted over the same physical connections used for communication signals, utilizing techniques such as DALI or similar techniques suited for lighting systems.

[0121] As a simple example, the signal output interface may comprise four terminals or connectors (e.g., for carrying a ground (GND), two control / dimming signals (e.g., PWM1,2025PF80126

[0122] 13

[0123] PWM2) and a power signal (VCC)) that connect to a corresponding four terminals or connectors of the signal input interface.

[0124] In some examples, the signal output interface may be integrated with or utilize the mounting mechanism of the lamp to establish a connection to the lamp. For example, the mounting mechanism may incorporate conductive elements or pathways that align with corresponding contacts on the control unit when installed, facilitating the transmission of at least the output control signal(s) and / or power.

[0125] In some examples, the control unit further comprises a radar sensor 157 configured to generate radar sensor data of the environment.

[0126] The function and structure of a radar sensor is well known to the skilled person. For instance, the radar sensor may comprise an antenna array for transmitting and receiving electromagnetic waves; signal processing circuitry to analyze reflected signals and produce the radar sensor data, e.g., defining one or more characteristics such as distance, velocity, and direction of objects in the environment.

[0127] The radar sensor data may more effectively represent movements or changes in the environment that might not be easily captured by the object detection sensors alone. For instance, it could detect a person entering a room before they come into the range of the object detection sensors or when a person is masked or obstructed by other objects.

[0128] The controller may be configured to use the radar sensor data in conjunction with the object sensor data to control or define the value(s) of the output signal(s) for the lamp. A wide variety of mechanisms or techniques for using both object sensor data and radar sensor data will be apparent to the skilled person.

[0129] In some examples, the controller may process the radar sensor data to refine, validate or crosscheck any predictions about occupancy or activities occurring in the environment derived from the object sensor data.

[0130] For instance, the controller may be configured to control the output control signal(s) to take a particular value, e.g., to cause the lamp to be illuminated, only when both the radar sensor data and the object sensor data indicate the presence of a subject.

[0131] As another example, the controller may be configured to control the output control signal(s) to take a particular value, e.g., to cause the lamp to be illuminated, only when the radar sensor data indicates the presence of a subject and the object sensor data indicate the occurrence of a particular event or activity (e.g., a fall).

[0132] The two or more object detection sensors 154 A, 154B, 154C, 154D may be arranged around the radar sensor. By positioning the object detection sensors around the radar2025PF80126

[0133] 14

[0134] sensor, the control unit is able to achieve comprehensive coverage of the environment while minimizing or reducing interference between sensors.

[0135] The radar sensor may have a wider field-of-view and be able to detect motion and presence over a larger area, while the object detection sensors (such as time-of-flight sensors) offer more precise detection within their specific fields of view. By surrounding the radar sensor with the object detection sensors, the control unit can leverage the strengths of both sensor types.

[0136] Moreover, arranging the object detection sensors around the radar sensor helps to improve the use of space within the control unit, contributing to a more compact control unit.

[0137] In some examples, the one or more auxiliary light sources 153 comprise one or more first auxiliary light sources arranged around the radar sensor. This may function to reduce a risk of interference between the light sources and the operation of the radar sensor.

[0138] The radar sensor may, for instance, be positioned centrally (e.g., aligned with the central axis Al) with respect to the control unit. This may, for instance, provide more symmetric coverage of the environment. The central positioning may also assist in heat management. By placing the radar sensor at the center of the control unit, heat generated by the radar sensor can be more evenly distributed or directed away from other sensitive components.

[0139] In some examples, the control unit further comprises an ambient light sensor 158 for generating ambient light sensor data. The ambient light sensor may comprise a photodiode or other photosensitive element that converts light into an electrical signal to form ambient light sensor data.

[0140] The ambient light sensor data generated by this ambient light sensor 158 may be used by the controller 155 to control the operation of the lamp 110 and / or the auxiliary light sources 153.

[0141] By way of example, the controller may be configured to control the one or more auxiliary light sources 153 to provide a night-light functionality responsive to the ambient light sensor data. In particular, the controller may be configured to process the ambient light sensor data to identify when ambient light levels fall below a predetermined threshold. The controller may be configured to activate the auxiliary light sources 153 as night-lights (i.e., control the auxiliary light source(s) to emit light) when ambient light levels drop below a predetermined threshold. This functionality enhances the utility of the luminaire by providing (e.g., low-level)2025PF80126

[0142] 15

[0143] illumination during nighttime or low-light conditions without requiring full activation of the primary light source(s) of the lamp.

[0144] In this way, the one or more auxiliary light sources may be configured to emit light responsive to the ambient light sensor data.

[0145] In some examples, the maximum intensity of the one or more auxiliary light sources may be less than the maximum intensity of the primary light source(s) of the lamp. This configuration may allow the auxiliary light sources to provide low-level illumination, while the primary light sources can offer higher levels of brightness for general lighting purposes.

[0146] The lower maximum intensity of the auxiliary light sources may be particularly useful for providing night-light functionality, as it can provide sufficient illumination for navigation or comfort without being overly bright or disruptive. This arrangement also improves energy efficiency, as the auxiliary light source(s) may consume less power when operating at their maximum intensity compared to the primary light source(s).

[0147] The two or more object detection sensors are arranged around the ambient light sensor. This configuration helps to reduce interference between the sensors. By placing the object detection sensors around the perimeter, with the ambient light sensor more centrally located, the risk of one sensor's operation affecting another is reduced. In particular, this may help maintain the accuracy of the ambient light sensor, which could be skewed if placed too close to the object detection sensors.

[0148] In some examples, the control unit 150 further comprises a wireless communication module 159.

[0149] The wireless communication module 159 may be configured to enable the control unit 150 (e.g., the controller 155 of the control unit) to communicate with one or more external devices or systems, such as remote controls or remote switches. The wireless communication module 159 may be configured to support one or more wireless communication protocols (such as Bluetooth ®, Wi-Fi ®, or Zigbee ®).

[0150] The wireless communication capability allows the control unit 150 to receive remote commands, transmit sensor data, and / or integrate with smart home systems. For instance, the wireless communication module 159 may enable users to control the luminaire remotely through a smartphone app or voice assistant.

[0151] In some examples, the controller 155 may define the one or more output signals using data received over the wireless communication module. In some examples, data received2025PF80126

[0152] 16

[0153] over the wireless communication module may supplement or override any sensor data collected by the control unit.

[0154] In some examples, the control unit further comprises a diffuser 310 positioned to cover at least the one or more auxiliary light sources and expose the two or more object detection sensors.

[0155] By covering the auxiliary light sources, the diffuser 310 helps reduce glare and direct visibility of the light-emitting components. By leaving the object detector sensors uncovered, their ability to detect subjects and changes in the environment remains unimpeded or unobscured by any diffusive effect. This ensures that the object sensor data is more accurate.

[0156] In some examples, if present, the ambient light sensor 158 may be covered by the diffuser 310. As the diffuser may help to distribute and soften the light reaching the ambient light sensor, the light received by the ambient light sensor will be a more accurate representation of the overall ambient light conditions in the environment.

[0157] In some examples, if present, the radar sensor 157 may be covered by the diffuser 310. In particular, the radar sensor may be configured to operate or function using electromagnetic waves that are able to penetrate the diffuser without (or with only negligible) distortion. Accordingly, the material of the diffuser may be appropriately selected to reduce a risk of interference with the radar signals. Known examples include plastics and glass.

[0158] This provides a mechanism for providing a more compact control unit and increasing an ease of manufacturing the control unit, as it appreciates that the position of the radar sensor need not be outside of the coverage of the diffuser, providing more flexibility in the arrangement of the control unit.

[0159] The two or more object detection sensors may be arranged around the diffuser. By positioning the object detection sensors around the perimeter of the diffuser, it ensures that these sensors have an unobstructed view of the environment, improving their detection capabilities, as well as facilitating a more uniform coverage of the environment.

[0160] In some examples, when both the diffuser 310 and the wireless communication module 159 are present in the control unit 150, the diffuser 310 may be configured to expose the wireless communication module. This configuration allows for reduced obstruction to any transmission and reception of wireless signals, improving the range and reliability of the wireless communication. By exposing the wireless communication module, the diffuser reduces possible signal attenuation that could otherwise occur if said module were covered.

[0161] In some examples, the diffuser comprises a top surface 311 and a side surface 312. A thickness of the top surface may be different to a thickness of the side surface.2025PF80126

[0162] 17

[0163] In some examples, the diffuser and auxiliary light source(s) may be arranged such that light emitted by the auxiliary light source(s) is transmitted (to an exterior environment) through at least part of both the top surface and the side surface.

[0164] Due to the thicknesses of the diffuser, such a diffuser is thereby able to achieve different light effects (for light emitted by the auxiliary light source(s)) using only one component. The combination of these two surfaces with different thicknesses thereby simplifies the manufacturing or assembly process by reducing the number of parts required to achieve different light effects.

[0165] In particular examples, a thickness of the top surface may be greater than the thickness of the side surface. The overall luminous effect using such a diffuser (where light emitted by the auxiliary light source(s) is transmitted through both the top surface and the side surface, creates two distinct emission of light, a circular emission (from the side surface) and a central surface emission (from the top surface).

[0166] A thicker top surface 311 may also create a more uniform illumination pattern from the top surface. The thinner side surface 312 facilitates reduced occupancy of a lateral space within the control unit, allowing for a more compact control unit.

[0167] The positioning of the object detection sensors may result in the object detection sensors benefitting from a dedicated heat sink arrangement. In particular, because (in use) the object detection sensor(s) will be positioned within the opening defined by the lamp, whilst also being positioned close to the outermost edge(s) of the opening, thereby being more susceptible to heating from the lamp.

[0168] Accordingly, the control unit may comprise a heat sink arrangement 330. The heat sink arrangement is configured to dissipate heat generated by the object detection sensors.

[0169] In particular, the heat sink arrangement is configured to, in use, extend away from the environment. In this way, the heat sink arrangement may comprise one or more heat-conducting elements (e.g., metal structures or the like) that extend from the object detection sensors towards a rear portion of the control unit.

[0170] The control unit may comprise one or more further sensors. Suitable examples of further sensors include: a single pixel thermopile, humidity sensor, temperature sensor, light sensor, sound pressure sensor, microphone, camera, PIR sensor, IR receiver, thermopile array, TMOS sensor, radar, and / or multispectral sensor. Each further sensor may be configured to generate further sensor data. The controller may be configured to control the output signal(s) and / or the operation of the auxiliary light source(s) responsive to the further sensor data, as would be readily appreciated by the skilled person.2025PF80126

[0171] 18

[0172] It is herein recognized that the object detection sensors may interfere with one another. This interference can occur due to several factors, including electromagnetic crosstalk, optical interference, and signal reflection. When multiple object detection sensors are placed in close proximity, e.g., a natural result of compact luminaire design, their signals may overlap or interact, potentially leading to false readings or reduced accuracy.

[0173] Previously described embodiments provide a mechanism for at least partially mitigating this interface, using a strategic arrangement of the object detection sensors. By positioning the sensors around the central axis of the control unit and surrounding the auxiliary light source(s), the design is able to spatially distance individual sensors from one another. This spatial separation helps to reduce direct signal interference between adjacent sensors.

[0174] Some further techniques for improving the mitigation of crosstalk or interference are hereafter described.

[0175] With specific reference to Figure 3, it will be appreciated that each object detection sensor 154B, 154D (e.g., time-of-flight sensor) defines a sensing direction DI, D2. The sensing direction extends from the object detection sensor along a central axis of the field-of-view associated with said object detection sensor.

[0176] Similarly, it will also be appreciated that each object detection sensor is associated with an angle of view. An angle of view represents the maximum angular extent of a field-of-view of the object detection sensor. For instance, consider a scenario in which the object detection sensor has a square detection area of 45°x45°. This defines a diagonal angle of view of 65°, which value represents the angle of view of the object detection sensor.

[0177] In some examples, each object detection sensor is configured such that an angle between the sensing directions (adjacent sensing angle) of two adjacent object detection sensors (e.g., when protected onto a plane parallel to both sensing directions) is set to 360° divided by the number of object detection sensors in the control unit. The value for the adjacent sensing angle (between two sensing directions) may have an error margin, e.g., of ±20% or ±5° and preferably do not breach these example error margins.

[0178] In this context, adjacent object detection sensors are two object detection sensors that are positioned next to each other in a spatial arrangement within the control unit, e.g., the closest to one another in terms of physical proximity and / or angular positioning around the central axis of the control unit.

[0179] This arrangement creates a symmetrical detection pattern that aims to increase the overall field-of-view while reducing a risk of blind spots and potential interference between sensors.2025PF80126

[0180] 19

[0181] More particularly, by setting an angle between the sensing directions of two adjacent object detection sensors (when projected onto a plane parallel to both sensing directions) to approximately 360° divided by the number of object detection sensors in the control unit, the angular positions of the object detection sensors around the central axis is effectively (substantially) evenly distributed.

[0182] By distributing the object detection sensors in this manner, the control unit achieves more uniform coverage of the surrounding environment. This configuration may help to reduce blind spots and improve the overall field-of-view of the object detection sensors.

[0183] The substantially even distribution of the object detection sensors also contributes to a reduction in the interference between adjacent sensors. By maintaining consistent angular separation between sensors, the risk of signal overlap or crosstalk may be minimized, improving the accuracy and reliability of the object detection system.

[0184] In some examples, each object detection sensor defines a tilting angle, wherein a tilting angle is an angle (specifically: a smallest angle) between the sensing direction of the object detection sensor and the central axis of the control unit (e.g., when the sensing direction and central axis are projected onto a plane parallel to both).

[0185] A tilting angle of 0° or 180° for an object detection sensor would mean the sensing direction of said object detection sensor is parallel to the central axis. A tilting angle of 90° for an object detection sensor would mean that the sensing direction is perpendicular to the central axis.

[0186] It is possible to define the tilting angle of the object detection sensor by way of one or more sidewalls 320 of the control unit 150, e.g., the support element 151 of the control unit. The sidewall(s) 320 can be molded or shaped to create an angled surface (as illustrated in Figure 3) or mounting points that precisely set the orientation or angle of each object detection sensor. By integrating the tilting angle into the structural design of the control unit, it ensures consistent and accurate positioning of the sensors across different units during manufacturing.

[0187] In some examples, for each object detection sensor, the tilting angle is non-zero - i.e., is non-parallel to the object detection sensor. In particular, the tilting angle for each object detection sensor may be greater than 5°, e.g., greater than 10°. This reduces possible overlap between the FOVs of the object detection sensors, to thereby increase the overall FOV of the object detection sensors.

[0188] In some examples, for each object detection sensor, the tilting angle of each object detection sensor is (e.g., approximately) a predetermined proportion of a field-of-view2025PF80126

[0189] 20

[0190] angle, being an angle of view of the object detection sensor. The value of the tilting angle, for each object detection sensor, may lies within an error margin or angle scope, e.g., of ±20% or ±5° from the predetermined proportion of the field-of-view angle. Thus, the angle scope of the tilting angle (i.e., the range of angles into which the tiling angle may fall) may be equal to the predetermined portion proportion of the field-of-view angle ± a predetermined error margin, e.g., 20% or 5°. The tilting angle may be selected to not exceed these example error margins.

[0191] In some examples, where the control unit comprises (e.g., exactly) three object detection sensors, the predetermined proportion is one-third. In some examples, where the control unit comprises (e.g., exactly) four object detection sensors, the predetermined proportion is around half (e.g., between 40% and 60% of the predetermined proportion).

[0192] Thus, in a scenario where the field-of-view angle (e.g., diagonal angle) is 65°, the tilting angle of each object detection sensor may be between 40% and 60% of this value, e.g., between 26°-39°, e.g., 50% of this value: 32.5°.

[0193] In some examples, each object detection sensor is configured such that, initially, the distance between the sensing direction and the central axis decreases with increased distance from the object detection sensor. In other words, the tilting angle of each object detection sensor may be acute or less than 90°. Thus, each object detection sensor may be configured to face inwardly towards the central axis. This can be arranged through appropriate selection of the tilting angle and positioning of each object detection sensor.

[0194] This configuration of the object detection sensors effectively creates an inwardfacing detection pattern. This configuration allows the object detection sensor(s) to be recessed within the opening defined by the lamp whilst being distanced from the central axis. By initially decreasing the distance between the sensing direction and the central axis as the distance from the sensor increases, the object detection sensors may be positioned further from the central axis while still maintaining coverage of the desired detection area.

[0195] By way of further explanation, if each object detection sensor were instead to be configured such that the distance between the sensing direction and the central axis initially increased with increased distance from the object detection sensor, then the object detection sensor could not be recessed within the opening defined by the lamp and be positioned to be distant from the central axis without the FOV of the object detection sensor being occluded or obstructed by the lamp.

[0196] The proposed approach thereby allows for a more compact design of the control unit, as the object detection sensors can be placed closer to the edges of the opening whilst remaining recessed with respect to the opening and maintaining a wide field-of-view. The2025PF80126

[0197] 21

[0198] recessed positioning within the lamp opening also offers protection for the sensors while still allowing them to effectively monitor the surrounding environment.

[0199] Figures 4, 5 and 6 conceptually illustrate definable angles for an object detection sensor.

[0200] Figure 4 provides an exemplary perspective view illustrating the central axis Al (of a sensing unit comprising an object detection center) and a sensing direction DI for the object detection sensor.

[0201] Figure 5 illustrates cross-sections of the field-of-view of the object detection sensor in a plane orthogonal to the sensing direction DI. Figure 6 provides a top-down view of the field-of-view (FOV) of the object detection sensor, i.e., in a plane orthogonal to the central axis. In the illustrated example, the tiling angle is set such that the field-of-view will naturally elongate with increased distance from the central axis.

[0202] Figure 4 illustrates a tilting angle P for the object detection sensor. As previously explained, a tilting angle is an angle (specifically: a smallest angle) between the sensing direction of the object detection sensor and the central axis of the control unit (e.g., when the sensing direction and central axis are projected onto a plane parallel to one or both).

[0203] Figure 4 also illustrate the projection of two effective field-of-views 401, 402 for the object detection sensor upon a plane 400 orthogonal to the central axis Al, e.g., a floor or ground surface, for different rotation angles of the object detection sensor. A rotation angle of the object detection sensor defines the orientation of the field-of-view with respect to the central axis Cl. In particular, a change in the rotation angle of the object detection sensor (e.g., by rotating the object detection sensor about the sensing direction DI) will result in a change of orientation of the field-of-view.

[0204] With reference to Figures 5 and 6, assuming that a cross-section (in a plane for which the sensing direction is normal) of the field-of-view of the object detection sensor is square or rectangular (i.e., having a plurality of comers), it is possible to define a bisecting plane and a central axis plane for each field-of-view.

[0205] The bisecting plane 511, 512 bisects the field-of-view 401, 402 and extends perpendicular to two parallel edges of the cross-section of the field-of-view (thereby intersecting the sensing direction DI). The central axis plane 520 contains the sensing direction DI and intersects the central axis Al .

[0206] It is also possible to define, for an object detection sensor, a rotation angle yi, 72 (more generally y) as an angle between a rotation angle plane 511, 512 and a central axis plane2025PF80126

[0207] 22

[0208] Bearing these definitions in mind, in some examples, the rotation angle y of each object detection sensor is between 35° and 55°, e.g., around 45°. This is particularly useful when the number of object detection sensors is four, as they may each provide a field-of-view that generally abuts or aligns with one another.

[0209] This functions to improve a combined or cumulative field-of-view of the object detection sensors, by reducing an overlap between the fields-of-view and improving an outward reach of the field-of-view of each object detection sensor.

[0210] Figure 7 illustrates exemplary FOVs for object detection sensors of a proposed control unit.

[0211] Figure 7 provides a top-down view of the fields-of-view of the object detection sensor, i.e., in a plane orthogonal to the central axis. In the illustrated example, the tilting angle is set such that the field-of-view will naturally elongate with increased distance from the central axis.

[0212] Here, the control unit comprises four object detection sensors, each having a respective field-of-view 701, 702, 703, 704 and a respective sensing direction D71, D72, D73, D74.

[0213] Each object detection sensor is configured such that an angle between the sensing directions D71, D72, D73, D74 (adjacent sensing angle a) of two adjacent object detection sensors (e.g., when protected onto a plane parallel to both sensing directions) is set to 360° divided by the number of object detection sensors in the control unit. Thus, the adjacent sensing angle is set to 90° for the present example.

[0214] More specifically, each object detection sensor is evenly distributed around the central axis, such that the angular position of each object detection sensor is a multiple of the adjacent sensing angle.

[0215] Each object detection sensor is also configured such that its rotation angle is set to 45°.

[0216] Figure 8 illustrates exemplary FOVs for object detection sensors of another proposed control unit.

[0217] Figure 8 provides a top-down view of the fields-of-view of the object detection sensor, i.e., in a plane orthogonal to the central axis. In the illustrated example, the tilting angle is set such that the field-of-view will naturally elongate with increased distance from the central axis.

[0218] Here, the control unit comprises three object detection sensors, each having a respective field-of-view 801, 802, 803 and a respective sensing direction D81, D82, D83.2025PF80126

[0219] 23

[0220] Each object detection sensor is configured such that an angle between the sensing directions D81, D82, D83 (adjacent sensing angle a) of two adjacent object detection sensors (e.g., when protected onto a plane parallel to both sensing directions) is set to 360° divided by the number of object detection sensors in the control unit. Thus, the adjacent sensing angle is set to 120° for the present example.

[0221] More specifically, each object detection sensor is evenly distributed around the central axis, such that the angular position of each object detection sensor is a multiple of the adjacent sensing angle.

[0222] Each object detection sensor is also configured such that its rotation angle is set to 45°.

[0223] Figure 9 illustrates a portion 900 of a proposed control unit.

[0224] Each object detection sensor 134A of the control unit may comprise a respective transmitter 901 and receiver 902. The transmitter 901 may be configured to emit one or more emittable waves (e.g., acoustic waves or electromagnetic waves). The receiver 902 is configured to monitor and receive any echoes from the emitted (emittable) waves. The object detection sensor may generate the object detection data responsive to the received echoes.

[0225] In some embodiments, to mitigate crosstalk both from other object detection sensors and from any reflection of the center of the sensor, each object detection sensor is rotated such that the transmitter 901 is more distant from the central axis Al of the control unit than the receiver 902 of the object detection sensor. This rotation of the object detection sensor may define the rotation angle of the object detection sensor, as previously described.

[0226] This angular adjustment directs the emission pattern of the object detection sensor outward from the control unit, reducing a risk of emitted signals / waves from reflecting off interior surfaces and causing false readings.

[0227] Referring back to Figure 1, there is also herein proposed a luminaire 100 comprising: the control unit 150 of any one of the previously described examples; and a lamp 110 positioned to at least partially surround the control unit.

[0228] As previously mentioned, in some examples, the lamp 110 comprises a lampshade 112 configured to cover the one or more primary light sources and mechanically engage with the support element of the control unit.

[0229] The lamp 110 may comprise a signal input interface 115 configured to receive the one or more output signals from the signal output interface of the control unit. This signal input interface may be designed to be compatible with the signal output interface, facilitating efficient and reliable communication between the control unit and the lamp.2025PF80126

[0230] 24

[0231] Of course, the lamp 110 may comprise a lamp controller (not visible in Figure 1) for controlling the operation of the primary light source(s) using the received output signal(s). This lamp controller may be configured to interpret and process the output signals received from the control unit's signal output interface via the lamp's signal input interface.

[0232] The lamp controller may be capable of adjusting various parameters of the primary light source(s) based on the received output signals. These adjustments may include, but are not limited to, modifying the intensity, color temperature, or spectral distribution of the emitted light. Appropriate techniques and circuitry for modifying the parameter(s) of a light source are well known in the art, and are not described for the sake of conciseness.

[0233] The luminaire may further comprise a fixing ring 160.

[0234] In practice, the fixing ring may have an annular shape, and be configured to surround the control unit and cover an edge of the control unit.

[0235] The fixing ring may be designed to expose a front side of the control unit. In some implementations, the fixing ring may be configured to leave uncovered or reveal at least the object detection sensor(s) of the control unit. This arrangement allows the object detection sensors to maintain an unobstructed view of the environment, thereby reducing an impact on their functionality.

[0236] In cases where a diffuser is present on the control unit, the fixing ring may also be shaped or positioned to expose the diffuser. By leaving the diffuser uncovered, the fixing ring may allow for unimpeded light transmission from any auxiliary light sources positioned behind the diffuser. This configuration helps maintain the intended light distribution pattern of the auxiliary light source(s).

[0237] The fixing ring 160 may clip to the support element of the control unit and engage with the lampshade of the lamp so as to support the overall structure of the luminaire, e.g., over time.

[0238] In this way, the fixing ring may incorporate an opening or cutout that exposes the identified elements.

[0239] Figure 10 provides a cross-sectional view of a portion 1000 of a proposed luminaire with a fixing ring 160. The fixing ring 160 is configured to mechanically clip to the support element 151 of the control unit 150.

[0240] In particular, a clipping element 1061 of the fixing ring 160 may clip to a clipping protrusion 1051 of the support element 151.

[0241] More specifically, in the assembled luminaire, the clipping protrusion of the support element may extend towards (a side surface 112A of) the lampshade 112. The clipping2025PF80126

[0242] 25

[0243] element 1061 may be insertable into a gap formed between the lampshade 112 and the clipping protrusion 1051 and engage with both so as to clip to the clipping protrusion. The clipping protrusion 1051 and clipping element 1061 thereby form a secure mechanical connection between the support element 151 of the control unit 150 and the fixing ring 160.

[0244] The fixing ring 160 is further configured to, when clipped to the support element 151 of the control unit 150, press against the lampshade 112 of the lamp. In other words, the fixing ring exerts pressure against the lampshade 112 of the lamp.

[0245] This helps maintain the intended shape and curvature of the lampshade over time, reducing a risk of sagging or deformation that could occur due to gravity or thermal effects. This also ensures a secure and stable connection between the control unit and the lampshade, reducing the risk of rattling or movement during operation or in response to external vibrations. This also aids in creating a tight seal between the lampshade and the control unit, which can improve the overall aesthetics of the luminaire by eliminating gaps and ensuring a seamless appearance.

[0246] An outermost edge portion 1052 of the fixing ring may be shaped to match or follow the outer geometry of the lampshade 112. This outermost edge portion may, in use, press against the outer geometry of the lampshade to distribute the pressure evenly across the lampshade surface, reducing the risk of localized stress points that could lead to deformation or damage over time.

[0247] An inner surface 1062 or inner flange of the fixing ring 160 may be configured to engage with the support element to provide the exerting pressure or force against the lampshade 112. The inner surface may be shaped to match or follow the shape of the support element to ensure a secure and uniform connection between the fixing ring and the support element, which improves the overall stability and alignment of the luminaire.

[0248] Variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a study of the drawings, the disclosure and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality.

[0249] Functions implemented by a processor may be implemented by a single processor or by multiple separate processing units which may together be considered to constitute a "processor". Such processing units may in some cases be remote from each other and communicate with each other in a wired or wireless manner.

[0250] The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.2025PF80126

[0251] 26

[0252] If the term "adapted to" is used in the claims or description, it is noted the term "adapted to" is intended to be equivalent to the term "configured to". If the term "arrangement" is used in the claims or description, it is noted the term "arrangement" is intended to be equivalent to the term "system", and vice versa.

[0253] Any reference signs in the claims should not be construed as limiting the scope.

Claims

2025PF8012627CLAIMS:

1. A control unit for a luminaire having a lamp for illuminating an environment, the control unit comprising:a support element shaped to fit into an opening defined by the lamp of the luminaire and having a front side for facing the environment;one or more auxiliary light sources, positioned on the front side of the support element, for illuminating the environment;two or more object detection sensors, each configured to generate object sensor data indicating whether or not a subject is present within a respective field-of-view in the environment, wherein the two or more object detection sensors are arranged around a central axis of the control unit and around the one or more auxiliary light sources, and each object detection sensor is configured to face inwardly towards the central axis;a controller configured to receive the object sensor data from each object detection sensor and generate one or more output signals for the lamp of the luminaire responsive to the object sensor data from each object detection sensor; anda signal output interface configured to connect to the lamp for providing the one or more output signals to the lamp of the luminaire, andwherein the control unit further comprises a diffuser positioned to cover the one or more auxiliary light sources and expose the two or more object detection sensors.

2. The control unit of any one of claims 1, wherein each object detection sensor is a time-of-flight, ToF, sensor, wherein a tilting angle of each time-of-flight sensor is non-zero, wherein the tilting angle of each time-of-flight sensor is an angle between a sensing direction of said time-of-flight sensor and the central axis of the control unit.

3. The control unit of any one of claims 1 to 2, further comprising a radar sensor configured to generate radar sensor data of the environment, wherein the two or more object detection sensors are arranged around the radar sensor.2025PF80126284. The control unit of claim 3, wherein the one or more auxiliary light sources comprise one or more first auxiliary light sources arranged around the radar sensor.

5. The control unit of any one of claims 1 to 4, further comprising an ambient light sensor for generating ambient light sensor data, wherein the two or more object detection sensors are arranged around the ambient light sensor.

6. The control unit of claim 5, wherein the two or more object detection sensors are arranged around the diffuser.

7. The control unit of any one of claims 5 or 6, wherein the diffuser comprises a top surface and a side surface, wherein a thickness of the top surface is different to a thickness of the side surface.

8. The control unit of any one of claims 1 to 7, further comprising a mechanical connector configured to connect the control unit to the lamp of the luminaire.

9. The control unit of any one of claims 1 to 8, further comprising a heat sink arrangement directly coupled to the two or more object detection sensors, wherein, in use, the heat sink arrangement extends away from the environment.

10. The control unit of any one of claims 1 to 9, wherein a front side of the support element is circular.

11. A luminaire comprising:the control unit of any one of claims 1 to 10; andthe lamp positioned to at least partially surround the control unit, wherein the lamp comprises one or more primary light sources and is configured to control the light emitted by each primary light source responsive to the one or more output control signals.

12. The luminaire of claim 11, wherein the lamp is an annular lamp positioned to surround the control unit.

13. The luminaire of claim 11 or 12, wherein:2025PF8012629the lamp comprises a lampshade configured to cover the one or more primary light sources and mechanically engage with the support element of the control unit; and the luminaire further comprises a fixing ring configured to:mechanically clip to the support element of the control unit; and when clipped to the support element of the control unit, press against the lampshade of the lamp to maintain a shape of the lampshade over time.

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