Lighting fixture and lighting system

Abstract

To provide a lighting fixture, etc., capable of performing dimming control on lighting so that a user can feel safe while the user is active in an indoor space.SOLUTION: A lighting fixture 20 according the present disclosure is one of a plurality of lighting fixtures 20, each of the lighting fixtures 20 emitting light in a different one of a plurality of areas 40. The lighting fixture 20 comprises: a light source 24; a communicator 21 which receives a first detection signal indicating that a person is detected in a target area being a target to be illuminated by the light of the lighting fixture and a second detection signal indicating that a person is detected in an area 40 other than the target area; and a controller 22 which (a) controls the light source 24 in a first dimming state when the first detection signal is received, and (b) maintains the first dimming state when, in a case where all of the plurality of lighting fixtures 20 are in the first dimming state, a second detection signal indicating that a person is detected in a first area other than the target area is received, and, during a most recent predetermined period, a second detection signal indicating that a person is detected in a second area other than the first area is received.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to lighting fixtures and lighting systems. [Background technology]

[0002] Regarding lighting control, a technology has been disclosed that gradually dims the brightness of lighting when it detects that people are no longer present in the lighting area, in order to prevent lighting fixtures from being turned off even when people are present in the lighting area (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-108703 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the technology disclosed in Patent Document 1 discloses illuminating areas where people are present, but does not disclose illuminating areas where no one is present around the areas where people are present, which results in the problem that the areas where no one is present remain dark, making people feel uneasy when moving around the indoor space.

[0005] Therefore, an object of the present disclosure is to provide a lighting fixture and a lighting system that can control the dimming of lighting so that a user can move around safely in an indoor space. [Means for solving the problem]

[0006] One aspect of a lighting device according to the present disclosure is one of a plurality of lighting devices that each emit light to a different area within a space, and includes a light source; a communication unit that receives a first detection signal indicating that a person has been detected in a target area that is the target area that is the target of light emitted by the lighting device, and a second detection signal indicating that a person has been detected in an area other than the target area among the plurality of areas; and a control unit that (a) controls the light source to a first dimming state when the first detection signal is received, and (b) when all of the plurality of lighting devices are in the first dimming state, maintains the first dimming state when the second detection signal indicating that a person has been detected in a first area other than the target area is received and the second detection signal indicating that a person has been detected in a second area other than the first area has been received within a most recent predetermined period.

[0007] Furthermore, one aspect of a lighting system according to the present disclosure includes a plurality of the above lighting devices and a plurality of sensors that detect the presence of a person. [Effects of the Invention]

[0008] The lighting fixture and lighting system according to the present disclosure can dim and control the lighting so that a user can move around safely in an indoor space. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a block diagram showing a functional configuration of a lighting system according to an embodiment. [Figure 2] FIG. 2 is a diagram showing an example of the arrangement of lighting fixtures and sensors in the lighting system according to the embodiment. [Figure 3] FIG. 3 is a schematic diagram of a communication network of a lighting system according to an embodiment. [Figure 4] FIG. 4 is a diagram illustrating the operation of the lighting system according to the embodiment. [Figure 5] FIG. 5 is a flowchart showing the operation of the lighting device according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of a lighting fixture and a lighting system according to the present disclosure will be described in detail with reference to the drawings. Note that each of the embodiments described below represents a preferred specific example of the present disclosure. The numerical values, components, component placement and connection configurations, steps, and step order shown in the following embodiments are merely examples and are not intended to limit the present disclosure. Furthermore, among the components in the following embodiments, components not recited in independent claims will be described as optional components constituting a preferred embodiment.

[0011] It should be noted that the drawings are schematic diagrams and are not necessarily strict illustrations. In addition, in the drawings, substantially the same components are denoted by the same reference numerals, and overlapping descriptions may be omitted or simplified.

[0012] (Embodiment) [composition] First, the configuration of a lighting system according to an embodiment will be described. Fig. 1 is a block diagram showing the functional configuration of a lighting system 10 according to an embodiment. As shown in Fig. 1, lighting system 10 includes a plurality of lighting fixtures 20 and a plurality of sensors 30. There is no particular limitation on the numbers of lighting fixtures 20 and sensors 30 included in lighting system 10.

[0013] The lighting system 10 is a system for illuminating an indoor space. The indoor space is, for example, an office. A user of the lighting system 10 is, for example, a person who works in the office where the lighting system 10 is installed.

[0014] Lighting fixture 20 is installed on the ceiling of an indoor space to illuminate the indoor space. Lighting fixture 20 is realized, for example, by a base light. The form of lighting fixture 20 is not particularly limited, and it may be a ceiling light, a downlight, a spotlight, or the like. Specifically, lighting fixture 20 includes a communication unit 21, a control unit 22, a memory unit 23, and a light source 24.

[0015] Communication unit 21 is a communication circuit (communication module) that enables lighting device 20 to communicate with multiple sensors 30. The communication performed by communication unit 21 is, for example, wireless communication in accordance with a communication standard such as BLE (Bluetooth (registered trademark) Low Energy), Wi-Fi (registered trademark), or Zigbee (registered trademark), but may also be wired communication. Communication unit 21 may perform wired communication with one sensor 30 and wireless communication with another sensor 30. There are no particular limitations on the communication standard used for communication performed by communication unit 21.

[0016] Control unit 22 controls the light emission of lighting device 20 (light source 24). Light emission control includes on / off control, dimming control, color adjustment control, and light distribution control. Control unit 22 is implemented, for example, by a microcomputer, but may also be implemented by a processor or dedicated circuit. The functions of control unit 22 are realized by hardware such as a microcomputer or processor constituting control unit 22 executing a computer program (software) stored in storage unit 23.

[0017] The storage unit 23 is a storage device that stores computer programs and the like executed by the control unit 22. The storage unit 23 is realized by, for example, a semiconductor memory.

[0018] Light source 24 emits white light into the indoor space so that lighting fixture 20 can illuminate the indoor space. Light source 24 is realized by, for example, an LED (Light Emitting Diode) element, but may also be realized by other light-emitting elements such as a semiconductor laser, an organic EL (Electro-Luminescence) element, or an inorganic EL element.

[0019] Sensor 30 is a sensor that has the function of detecting a person present in the indoor space and transmitting a detection signal indicating that a person has been detected to lighting fixture 20. Sensor 30 is realized, for example, by a human presence sensor. The human presence sensor is a pyroelectric sensor (infrared sensor) that detects infrared rays emitted from the human body. Sensor 30 may also be realized by an image sensor (camera) that captures images of the indoor space. Sensor 30 may also be realized by a radio wave sensor. Sensor 30 is not particularly limited as long as it is a sensor that can detect the magnitude of movement.

[0020] Next, an arrangement of the lighting devices 20 and the sensors 30 in the lighting system 10 according to the embodiment will be described. Fig. 2 is a diagram showing an example of the arrangement of the lighting devices 20 and the sensors 30 in the lighting system 10 according to the embodiment.

[0021] As shown in Fig. 2, the indoor space is divided into multiple areas 40, and for example, one set of lighting fixture 20 and sensor 30 is installed in each area. Specifically, in Fig. 2, the indoor space is divided into 12 areas 40a to 40l. For example, area 40a is illuminated by lighting fixture 20a and sensed by sensor 30a.

[0022] Note that multiple sensors 30 may be installed in one area 40, and multiple lighting fixtures 20 may be installed in one area 40. As long as the area 40 sensed by the sensor 30 corresponds to the area 40 to which the lighting fixture 20 irradiates, the number of lighting fixtures 20 and sensors 30 is not particularly limited.

[0023] Basically, when a lighting fixture 20 installed in a certain area 40 receives a detection signal from a sensor 30 installed in that area 40 indicating that the sensor 30 has detected a person, the lighting fixture 20 emits light into that area 40. In the lighting system 10, the lighting fixture 20 installed in one area 40 also receives detection signals transmitted by sensors 30 installed in other areas 40, and monitors the detection results of the sensors 30 in the other areas 40.

[0024] The following describes such a communication network in lighting system 10. Fig. 3 is a schematic diagram of the communication network of lighting system 10 according to an embodiment. As shown in Fig. 3, lighting fixture 20a (installed in area 40a) communicates with sensor 30a (sensor 30a associated with lighting fixture 20a) installed in area 40a. The fact that sensor 30a is associated with lighting fixture 20a indicates that the area illuminated by lighting fixture 20a and the area sensed by sensor 30a are the same.

[0025] Lighting fixture 20a also communicates with sensors 30b, 30c, 30d, and 30e that are not associated with lighting fixture 20a. That is, lighting fixture 20a receives detection signals from all sensors 30a-e included in lighting system 10. In other words, sensor 30a transmits detection signals to all lighting fixtures 20 included in lighting system 10.

[0026] 3, the detection signals are depicted as being transmitted from each of the sensors 30a-e to the lighting fixture 20a, but the detection signals may be transmitted in any manner. For example, multiple lighting fixtures 20 and multiple sensors 30 may form a wireless mesh network, and a detection signal transmitted by one sensor 30 may be relayed by other lighting fixtures 20 and other sensors 30 before being received by the lighting fixture 20a.

[0027] [Operation] Next, the operation of lighting system 10 according to the embodiment will be described. Lighting system 10 is a system that causes lighting device 20 to emit bright light under predetermined conditions not only when a person is detected in a target area that lighting device 20 is intended to illuminate, but also when a person is detected in an area other than the target area. Such lighting system 10 can dim the lighting so that a user can move around safely in an indoor space.

[0028] The operation of such lighting system 10 will be described below with reference to Fig. 4 and Fig. 5 in addition to Fig. 2. Fig. 4 is a diagram showing the operation of lighting system 10 according to the embodiment. Fig. 4(a) is a diagram showing the operation of sensor 30 in lighting system 10 according to the embodiment. Fig. 4(b) is a diagram showing the operation of lighting device 20 in lighting system 10 according to the embodiment.

[0029] Fig. 4(a) shows whether each of sensors 30a to 30l, which are arranged to sense areas 40a to 40l shown in Fig. 2, detected a person at a certain time. The symbol "*" in Fig. 4(a) indicates that sensor 30 detected a person. For example, at time "3", it is shown that sensors 30a and 30b detected a person.

[0030] FIG. 4(b) shows the dimming states at a certain time of lighting fixtures 20a-20l, which are arranged to respectively illuminate areas 40a-40l shown in FIG. 2. The symbol "◯" in FIG. 4(b) indicates that lighting fixture 20 is in the first dimming state (a bright dimming state). The blank space in FIG. 4(b) indicates that lighting fixture 20 is in the second dimming state (a dimming state that is darker than the first dimming state). For example, at time "9," lighting fixture 20j is in the first dimming state, and lighting fixtures 20a-i, k, and l are in the second dimming state. The "time" is the same in FIG. 4(a) and FIG. 4(b).

[0031] In Figure 4, at the initial time "1," lighting devices 20a-20l are all in the second dimming state (dark dimming state). At time "2," when a user enters area 40a within the indoor space from outside, sensor 30a detects the user and transmits a detection signal to lighting devices 20a-20l. As a result, lighting devices 20a-20l emit light in the first dimming state.

[0032] At time "2" and the following times "3" to "7," sensors 30a-30e, 30g, etc. detect the user as he or she moves around the room and send detection signals to lighting devices 20a-20l. During this time, lighting devices 20a-20l continue to emit light in the first dimming state.

[0033] When a user arrives in area 40j at time "8" and remains in area 40j, only sensor 30j detects the user and transmits a detection signal to lighting devices 20a-20l. The other sensors 30a-30i and 30k-30l do not detect the user. If this state continues, only lighting device 20j will emit light in the first dimming state, while the other lighting devices 20a-20i and 20k-20l will switch to the second dimming state. In FIG. 4, from times "9" to "11", only lighting device 20j emits light in the first dimming state.

[0034] At time "11," when none of sensors 30a-30l detect a user, all lighting devices 20a-20l switch to the second dimming state at time "12." If sensor 30l detects the same user or another user at time "12," lighting devices 20a-20l switch to the first dimming state.

[0035] In this way, in lighting system 10, when all lighting devices 20a-20l are in the second dimming state, if any one of sensors 30a-30l detects a user, all lighting devices 20a-20l will emit light in the first dimming state, and if the state in which only one of sensors 30a-30l detects a user continues, only the area corresponding to that sensor will be in the first dimming state.

[0036] To achieve this operation, each of lighting devices 20a to 20l operates as shown in Fig. 5. Fig. 5 is a flowchart showing the operation of lighting device 20 according to the embodiment.

[0037] In the following description of FIG. 5, it is assumed that each of lighting devices 20a-20l manages (knows) its current dimming state (whether it is in the first dimming state or the second dimming state), and that the determinations in steps S14 and S15 below are made based on this management. For example, lighting devices 20a-20l manage the dimming state of lighting devices 20a-20l based on detection signals received from sensors 30a-30l. However, lighting devices 20a-20l may also manage the dimming state of lighting devices 20a-20l by periodically communicating with each other. In the following description of FIG. 5, it is assumed that lighting device 20 refers to any one of lighting devices 20a-20l, and sensor 30 refers to any one of sensors 30a-30l.

[0038] First, communication unit 21 receives a detection signal from sensor 30 (S11 in FIG. 5). The detection signal is a signal indicating that sensor 30 has detected the presence of a person in a detection area targeted for detection. Sensor 30 transmits the detection signal to communication unit 21 of lighting device 20, for example, via wireless communication.

[0039] When communication unit 21 receives a detection signal, control unit 22 determines whether the received detection signal is a first detection signal (S12 in FIG. 5). The first detection signal is a detection signal transmitted by sensor 30 associated with lighting device 20. That is, the first detection signal indicates that a person has been detected in a target area that is to be illuminated with light from lighting device 20. For example, the target area that is to be illuminated with light from lighting device 20a shown in FIG. 2 is area 40a. Therefore, the first detection signal received by lighting device 20a is a detection signal transmitted by sensor 30a when it detects a person in area 40a.

[0040] If the received detection signal is determined to be the first detection signal (Yes in S12 of FIG. 5), the control unit 22 controls the light source 24 to emit light in a first dimming state for a predetermined period of time (S13 of FIG. 5). The first dimming state is a state in which the light source 24 emits light at a predetermined brightness. The predetermined period is, for example, 3 minutes. The predetermined period may be 5 minutes or 1 minute. The length of the predetermined period is not particularly limited here.

[0041] If it is determined that the received detection signal is not the first detection signal (No in S12 of FIG. 5), that is, if it is determined that the received detection signal is the second detection signal, the control unit 22 determines whether all lighting devices 20 are in the second dimming state (S14 of FIG. 5).

[0042] The second detection signal is a detection signal transmitted by a sensor 30 that is not associated with lighting device 20. In other words, the second detection signal indicates that a person has been detected in area 40 other than the target area that lighting device 20 is irradiating with light. The second detection signal makes it possible to identify which sensor 30 transmitted the detection signal. For example, in FIG. 2, the second detection signal received by lighting device 20a is a detection signal transmitted by sensors 30b to 30l. The second dimming state is a state in which light source 24 emits light that is dimmer than in the first dimming state.

[0043] If it is determined that all lighting devices 20 are in the second dimming state (Yes in S14 of FIG. 5), controller 22 controls light source 24 to emit light in the first dimming state (S13 of FIG. 5).

[0044] If it is determined that all lighting devices 20 are not in the second dimming state (No in S14 of FIG. 5), controller 22 determines whether all lighting devices 20 are in the first dimming state (S15 of FIG. 5).

[0045] If it is determined that none of the lighting devices 20 are in the first dimming state (No in S15 of FIG. 5), the controller 22 controls the light sources 24 to the second dimming state (S16 of FIG. 5). In other words, if it is determined that only some of the lighting devices 20 are in the first dimming state, the controller 22 controls the light sources 24 to the second dimming state.

[0046] If it is determined that all lighting devices 20 are in the first dimming state (Yes in S15 of FIG. 5), controller 22 then determines whether a person has been detected in only one area during the most recent predetermined period (S17 of FIG. 5). The most recent predetermined period is a predetermined period going back from the moment the detection signal was received in step S11. The most recent predetermined period includes the moment the detection signal was received in step S11.

[0047] If it is determined that people have been detected in multiple areas 40 during the most recent predetermined period (No in S17 of FIG. 5), the control unit 22 controls the light source 24 to emit light in the first dimming state (S13 of FIG. 5).

[0048] If it is determined that a person has been detected in only one area 40 during the most recent predetermined period (Yes in S17 of FIG. 5), the control unit 22 controls the light source 24 to the second dimming state (S16 of FIG. 5).

[0049] Each time a detection signal is received, each lighting device 20 included in lighting system 10 repeats the process of steps S11 to S17 in Fig. 5. Alternatively, each lighting device 20 may repeat the process of steps S11 to S17 in Fig. 5 at intervals that are sufficiently shorter than the predetermined period.

[0050] According to the above-described operation, lighting device 20 is controlled to the first dimming state under predetermined conditions not only when a person is present in the target area but also when a person is detected in an area other than the target area. In other words, lighting system 10 keeps all lighting devices 20 bright when sensor 30 detects that a user is continuing to move or that multiple users are present in the indoor space. This allows users to move around the indoor space with peace of mind.

[0051] [Variations] In the above embodiment, controller 22 controls light source 24 to the second dimming state, which is darker than the first dimming state. However, when controlling light source 24 to the second dimming state, controller 22 may control light source 24 to the off state instead of the second dimming state. In the above embodiment, the second dimming state may be interpreted as the off state as appropriate. When lighting system 10 determines that only one user is using the indoor space, it can turn off lighting fixture 20 that illuminates an area where no user is present.

[0052] In the above embodiment, in step S17 of FIG. 5 , controller 22 determines whether a person has been detected in only one area during the most recent predetermined period. However, the one area may be multiple areas. That is, controller 22 may determine whether a person has been detected in only multiple areas during the most recent predetermined period. For example, if two users are using an indoor space and each of the two users stays in a specific area to work, controller 22 determines that a person has been detected in only two areas during the most recent predetermined period. The number of multiple areas is, for example, two, but may also be three; the number of multiple areas is not particularly limited here. Such lighting system 10 can prevent lighting fixtures 30 illuminating areas without users from being maintained in the first dimming state when the number of users using the indoor space is equal to or less than the number of predetermined multiple areas.

[0053] In the above embodiment, in step S12 of FIG. 5, controller 22 determines whether the detection signal is the first detection signal. However, controller 22 may determine whether the detection signal is the first detection signal or a predetermined second detection signal. The predetermined second detection signal is, for example, a detection signal indicating that a person has been detected in an area near a target area to be illuminated by lighting devices 20. The area near the target area is, for example, an area adjacent to the target area. In such lighting system 10, when a user remains in a certain area, lighting devices 20 that illuminate areas adjacent to the target area also emit light in the first dimming state. Therefore, when a user remains in a certain area, the user can perform work, etc., with greater peace of mind.

[0054] The predetermined second detection signal may be, for example, a detection signal transmitted by a sensor 30 that detects an area including an entrance / exit of the indoor space. Such lighting system 10 controls all lighting devices 20 to emit light in the first dimming state every time a user enters or exits the indoor space, allowing the user to move around the indoor space with peace of mind.

[0055] 5 , each of lighting fixtures 20a-20l manages (knows) its own current dimming state (whether it is in the first dimming state or the second dimming state) and determines the dimming states of the other lighting fixtures 20 based on this management. However, control unit 22 may determine the dimming states of the other lighting fixtures 20 by receiving the dimming states of each lighting fixture 20 via a mesh network formed by multiple lighting fixtures 20. Furthermore, lighting system 10 may include a device that acquires the dimming states of each of the multiple lighting fixtures 20, and control unit 22 may determine the dimming states of the other lighting fixtures 20 based on the dimming states of each of the multiple lighting fixtures 20 acquired from the device.

[0056] [Effects, etc.] Below, examples of the techniques disclosed in this specification will be given, and the effects of the examples will be described.

[0057] Technique 1 relates to a lighting fixture 20, which is one of a plurality of lighting fixtures 20 that each emit light to a different area 40 included in a space, and which includes a light source 24, a communication unit 21 that receives a first detection signal indicating that a person has been detected in a target area that is the target area that is the target of light emitted by the lighting fixture 20, and a second detection signal indicating that a person has been detected in an area 40 of the plurality of areas 40 other than the target area, and a control unit 22 that (a) controls the light source 24 to a first dimming state when the first detection signal is received, and (b) maintains the first dimming state when all of the plurality of lighting fixtures 20 are in the first dimming state, if a second detection signal indicating that a person has been detected in a first area other than the target area is received and if a second detection signal indicating that a person has been detected in a second area other than the first area has been received within the most recent specified period.

[0058] With such lighting fixture 20, the entire indoor space is kept bright even when a user is constantly moving or when multiple users are present in the indoor space, allowing the users to move around safely in the indoor space.

[0059] Technique 2 is lighting device 20 according to technique 1, in which, when all of multiple lighting devices 20 are in a second dimming state that is darker than the first dimming state or in an off state, control unit 22 controls light source 24 to the first dimming state regardless of whether the first detection signal or the second detection signal is received.

[0060] When a person is detected while all lighting fixtures 20 are in the second dimming state or off, all lighting fixtures 20 are controlled to the first dimming state. Therefore, when a user enters a dark indoor space, the entire indoor space becomes bright, allowing the user to move around in the indoor space with peace of mind.

[0061] Technique 3 is lighting fixture 20 according to technique 1 or 2, in which control unit 22 controls light source 24 to a second dimming state that is darker than the first dimming state or to an off state when all of multiple lighting fixtures 20 are in a first dimming state, a second detection signal indicating that a person has been detected in the first area is received, and only second detection signals indicating that a person has been detected in the first area have been received within the most recent specified period.

[0062] With such lighting fixtures 20, when there is only one user using the indoor space, lighting fixtures 20 that illuminate areas where no user is present can be set to the second dimming state or turned off.

[0063] Technique 4 is lighting device 20 according to any one of techniques 1 to 3, in which the first area is a plurality of areas 40.

[0064] When the number of users using the indoor space is equal to or less than the number of predetermined areas, such lighting fixture 20 can prevent lighting fixture 30 illuminating areas where no users are present from being maintained in the first dimming state.

[0065] Technique 5 is lighting device 20 according to any one of techniques 1 to 4, wherein control unit 22 controls light source 24 to the first dimming state when a second detection signal indicating that a person has been detected in an area near the target area is received.

[0066] Such lighting fixtures 20 are controlled so that lighting fixtures 20 illuminating areas adjacent to the area where a person is present are also in the first dimming state, so that when a user remains in a certain area, the surrounding area is also illuminated, allowing the user to work with peace of mind.

[0067] Technique 6 is a lighting system 10 that includes multiple lighting fixtures 20 according to any one of techniques 1 to 5, and multiple sensors 30 that detect the presence of a person.

[0068] Such a lighting system 10 keeps all lighting fixtures 20 bright when the sensor 30 detects that a user is continuing to move or that multiple users are in the indoor space, allowing the user to move around safely in the indoor space.

[0069] (Other embodiments) While the lighting fixture and lighting system according to the present disclosure have been described above based on the embodiments, the present disclosure is not limited to the embodiments. As long as they do not deviate from the gist of the present disclosure, various modifications conceivable by those skilled in the art to the embodiments and other forms constructed by combining some of the components of the embodiments are also included within the scope of the present disclosure.

[0070] In the above embodiment, the lighting system is realized by a plurality of devices. As such, the "system" in this specification may be composed of a plurality of devices or a single device. When the system is composed of a plurality of devices, the components (especially functional components) of the system may be distributed among the plurality of devices in any manner.

[0071] Furthermore, the method of communication between the devices in the above-described embodiment is not particularly limited. Furthermore, a relay device (such as a broadband router, not shown) may be involved in the communication between the devices.

[0072] In the above-described embodiment, the processing performed by a specific processing unit may be performed by another processing unit. The order of multiple processing operations may be changed, or multiple processing operations may be performed in parallel.

[0073] In the above-described embodiments, each component may be realized by executing a software program suitable for that component, or by a program execution unit such as a CPU or processor reading and executing a software program recorded on a recording medium such as a hard disk or semiconductor memory.

[0074] Furthermore, each component may be realized by hardware. For example, each component may be a circuit (or integrated circuit). These circuits may form a single circuit as a whole, or each may be a separate circuit. Furthermore, each of these circuits may be a general-purpose circuit or a dedicated circuit. [Explanation of symbols]

[0075] 10. Lighting System 20, 20a~20l lighting fixtures 21 Communications Department 22 Control Unit 24 Light source 30, 30a~30l sensor 40, 40a-40l area

Claims

1. A lighting fixture among a plurality of lighting fixtures each irradiating light onto a different area of ​​a space, A light source and a communication unit that receives a first detection signal indicating that a person has been detected in a target area that is a target area to be irradiated with light from the lighting device, and a second detection signal indicating that a person has been detected in an area other than the target area among the plurality of areas; a control unit that (a) controls the light source to a first dimming state when the first detection signal is received, and (b) when all of the plurality of lighting devices are in the first dimming state, maintains the first dimming state when the second detection signal indicating that a person has been detected in a first area other than the target area is received and when the second detection signal indicating that a person has been detected in a second area other than the first area has been received within a recent predetermined period. Lighting fixtures.

2. When all of the lighting devices are in a second dimming state that is darker than the first dimming state or in an off state, the control unit controls the light source to the first dimming state regardless of whether the first detection signal or the second detection signal is received.

10. The lighting fixture of claim 1.

3. the control unit controls the light source to a second dimming state that is darker than the first dimming state or to an off state when all of the plurality of lighting devices are in the first dimming state, the second detection signal indicating that a person has been detected in the first area is received, and only the second detection signal indicating that a person has been detected in the first area has been received during the most recent predetermined period.

3. A lighting fixture according to claim 1 or 2.

4. the first area is a plurality of areas; 3. A lighting fixture according to claim 1 or 2.

5. the control unit controls the light source to the first dimming state when the second detection signal indicating that a person has been detected in an area near the target area is received, among the second detection signals.

3. A lighting fixture according to claim 1 or 2.

6. A plurality of lighting fixtures according to claim 1 or 2; and a plurality of sensors for detecting the presence of a person. Lighting system.

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