Lighting systems, luminaires, and vehicles

Abstract

To provide a lighting system, a control device, a lighting fixture, and a vehicle that can wirelessly control the timing of dimming multiple lighting fixtures.SOLUTION: A lighting system according to an embodiment of the present invention includes a control device and a plurality of lighting fixtures. The control device wirelessly transmits a dimming control signal a plurality of times at a predetermined time interval. The plurality of lighting fixtures receive a dimming control signal. The dimming control signal includes transmission count information indicating the number of times the dimming control signal has been transmitted, and each of the plurality of lighting fixtures includes a light-emitting unit and a light emission timing control unit that controls the timing of emitting light from the light-emitting unit on the basis of the transmission count information.SELECTED DRAWING: Figure 1

Description

【Technical Field】 【0001】 The present invention relates to a lighting system, a control device, a luminaire, and a vehicle applicable to lighting devices such as railway vehicles. 【Background Art】 【0002】 Conventionally, among a plurality of luminaires arranged in railway vehicles and the like, there are interior lights for illuminating the vehicle interior and backup lights used when the interior lights are off, and different dimming rate controls may be required for each of them. 【0003】 For example, in Patent Document 1, lighting control such as dimming of general light sources and backup light sources arranged on the ceiling side in the passenger compartment of a railway vehicle is executed by various signals output from a control device. These general light sources and backup light sources are connected to the control device so as to be able to transmit and receive various signals. 【0004】 In this way, the transmission and reception of signals between the control device as the master unit and the plurality of luminaires as the slave units may be performed by wire. Similarly, the transmission and reception of signals between the master unit and the slave unit may be performed wirelessly. In this case, the slave unit may not always receive the dimming control command transmitted wirelessly at once. 【Prior Art Documents】 【Patent Documents】 【0005】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2019-169499 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0006】 In such a case of wireless communication, for example, when trying to transmit a dimming control command 10 times at an interval of 100 ms so that all of a plurality of luminaires receive the dimming command, there is a problem that a time difference of 900 ms occurs between the luminaire that received the dimming control command for the first time and the luminaire that received the dimming control signal for the tenth time, and the timing of dimming cannot be controlled. 【0007】 In view of the above circumstances, the object of the present invention is to provide a lighting system, control device, lighting fixtures, and vehicle that can wirelessly control the timing of dimming multiple lighting fixtures. [Means for solving the problem] 【0008】 A lighting system according to one embodiment of the present invention comprises a control device and a plurality of luminaires. The above-mentioned control device transmits dimming control signals wirelessly multiple times at predetermined time intervals. The above-mentioned multiple lighting fixtures receive the above-mentioned dimming control signal. The above dimming control signal includes transmission count information indicating which dimming control signal has been transmitted, Each of the above-mentioned multiple lighting fixtures includes a light-emitting unit and a light-emitting timing control unit that controls the timing at which the light-emitting unit emits light based on the transmission count information. 【0009】 According to the lighting system described above, multiple light fixtures can determine which dimming control signal was received, allowing them to control the timing of their light emission. In other words, the timing of the light emission of multiple light fixtures can be synchronized. 【0010】 The above-mentioned light emission timing control unit may, after receiving the dimming control signal, dim the light emission unit after a waiting period which is the product of the difference between the total number of times the dimming control signal is transmitted and the number of transmissions indicated in the transmission count information, and the predetermined time interval. 【0011】 The above-mentioned multiple lighting fixtures may be connected to each other in a multi-hop network. 【0012】 The control device may transmit the dimming control signal via broadcast. 【0013】 The above lighting system may be installed in a railway vehicle. 【0014】 The above control device is installed in the first vehicle, The above-mentioned multiple lighting fixtures may be installed on the first vehicle and the second vehicle connected to the first vehicle. 【0015】 To achieve the above objective, the control device according to the present invention is a control device that wirelessly transmits dimming control signals to multiple lighting fixtures multiple times at predetermined intervals, wherein the dimming control signal includes transmission count information indicating which dimming control signal is being transmitted. 【0016】 To achieve the above objective, the luminaire according to the present invention is a plurality of luminaires that receive dimming control signals transmitted wirelessly multiple times at predetermined intervals from a control device, wherein the dimming control signal includes transmission count information indicating which dimming control signal is being transmitted. Each of the above-mentioned multiple lighting fixtures includes a light-emitting unit and a light-emitting timing control unit that controls the timing at which the light-emitting unit emits light based on the transmission count information. 【0017】 To achieve the above objective, the vehicle according to the present invention is equipped with a lighting system. The above lighting system comprises a control device and multiple light fixtures. The above-mentioned control device transmits dimming control signals wirelessly multiple times at predetermined time intervals. The above-mentioned multiple lighting fixtures receive the above-mentioned dimming control signal. The above dimming control signal includes transmission count information indicating which dimming control signal has been transmitted, Each of the above-mentioned multiple lighting fixtures includes a light-emitting unit and a light-emitting timing control unit that controls the timing at which the light-emitting unit emits light based on the transmission count information. [Effects of the Invention] 【0018】 According to the control device of the present invention, the timing of dimming multiple lighting fixtures can be controlled wirelessly. [Brief explanation of the drawing] 【0019】 [Figure 1]It is a diagram schematically showing a lighting system according to a first embodiment of the present invention. [Figure 2] It is a block diagram showing a configuration example of a lighting fixture. [Figure 3] It is a block diagram showing a configuration example of a master unit. [Figure 4] It is a flowchart showing the processing of the master unit of the lighting system. [Figure 5] It is a flowchart showing the processing of the lighting fixture of the lighting system. [Figure 6] It is a diagram schematically showing a lighting system according to a modification of the present invention. [Figure 7] It is a block diagram showing a configuration example of the lighting fixture according to the modification. 【Modes for Carrying Out the Invention】 【0020】 Hereinafter, embodiments of the present invention will be described with reference to the drawings. 【0021】 <First Embodiment> FIG. 1 is a diagram schematically showing a lighting system 100 according to a first embodiment of the present invention. In FIG. 1, the lighting system 100 includes a control device (master unit 1) and a lighting fixture 2 (a plurality of lighting fixtures) that receives a signal (a dimming control signal S1 described later) transmitted from the control device (master unit 1). In the present embodiment, as shown in FIG. 1, the railway vehicle in which the master unit 1 is provided is taken as the first vehicle (railway vehicle 10), and the railway vehicle connected to the railway vehicle 10 is taken as the second vehicle (railway vehicle 20). 【0022】 As shown in Figure 1, the railway vehicle 10 has a master unit 1 and lighting fixtures 2a to 2c. For example, the railway vehicle 10 is a commuter train or express train that can run on a track (not shown), and generally has a bogie 11 and a vehicle body 12 supported by the bogie. The vehicle body 12 is configured to form a hexahedron by a frame 13 that forms the floor of the railway vehicle 10, a pair of end bodies 14 (e.g., gable bodies) erected at both ends of the frame 13 in the direction of the track to form the connecting parts 5 of the vehicle body 12, a pair of end sides 15 erected at both ends of the frame 13 in the direction of the sleepers to form the side parts of the vehicle body 12, and a roof body 16 that is connected to the upper ends of the pair of end bodies 14 and the upper ends of the pair of end sides 15 to form the roof of the vehicle body 12. 【0023】 The interior of the vehicle body 12 includes passenger compartments and a crew compartment. The vehicle body 12 is equipped with passenger entrances and windows leading to the passenger compartment, and a crew entrance leading to the crew compartment. Handrails (not shown) are fixed to the ceiling of the passenger compartment. In addition, the railway vehicle may have electronic equipment such as in-car information screens that display destinations and news, security cameras, and communication equipment. 【0024】 In this embodiment, the connecting section 5 is provided with a door (end plate). For example, passengers can move to the adjacent railway car 20 by opening the door manually or automatically. In this embodiment, the door is made of metal. 【0025】 As shown in Figure 1, a railway vehicle 20 is connected to a railway vehicle 10 via a coupling section 5. The railway vehicle 20 has a light fixture 2. Similarly, the vehicle further connected to the railway vehicle 20 via the coupling section 5 also has a light fixture. 【0026】 Master unit 1 is a wireless terminal that communicates with slave units (lighting fixtures 2). In this embodiment, master unit 1 uses ZigBee®, a multi-hop standard. In ZigBee, communication takes place between devices that have a common PAN (Personal Area Network) ID set. For example, when master unit 1 transmits a signal with a specific PANID, lighting fixture 2, which has the same PANID set, receives the signal and transmits the received signal as is. When another lighting fixture with the same PANID receives the signal, it transmits the received signal as is. In this way, signals are sent and received between devices that have the same PANID set, and communication takes place between all devices that have the same PANID set. 【0027】 The communication method between the master unit 1 and the light fixture 2 is not limited to ZigBee; other multi-hop communication methods may be used. For example, a communication method may be used in which wireless nodes using low-power radio in a predetermined frequency band installed on each device search for neighboring nodes, autonomously build a network, and collect data in a bucket-brigade fashion. This communication method has the advantage of not requiring communication running costs and being suitable for areas with high housing density. In this embodiment, the master unit 1 transmits a dimming control signal S1 to the light fixture 2 via broadcast, and the light fixture 2, upon receiving the dimming control signal S1, forwards the dimming control signal S2 in a bucket-brigade fashion. Furthermore, the communication method between the master unit 1 and the light fixture 2 may be a communication method other than multi-hop communication. In addition, other than multi-hop communication, for example, the master unit 1 may transmit the dimming control signal S1 to the light fixture 2 via broadcast only. 【0028】 In this embodiment, the master unit 1 also functions as a control device capable of dimming the luminaires 2. That is, a signal from the master unit 1 indicating that dimming control should be performed is received by a nearby luminaire, and the signal is then transmitted and received from that luminaire to the next luminaire. 【0029】 In Figure 1, the master unit 1 is located in the leading car (for example, the driver's cab). For example, when the conductor controls the dimming rate of the interior lights, the dimming rate of each light fixture 2 (slave unit) is controlled by operating the control device (master unit 1). The location of the master unit 1 is not limited; it may be located in the leading car, the last car, or in any of the cars coupled between the leading and last cars. 【0030】 Light fixture 2 receives various signals from master unit 1 and transmits signals from master unit 1 to neighboring light fixtures. In this embodiment, light fixture 2 is arranged in the longitudinal direction of the vehicle body 12. In addition to the leading vehicle, light fixture 2 is also similarly arranged in the railway vehicles 20 connected to the leading vehicle, all the way to the last vehicle. 【0031】 Furthermore, the sub-units are not limited to lighting fixtures; in-vehicle information screens that display destinations, news, etc., as well as electronic devices such as security cameras and communication equipment, may also be treated as sub-units. In this case, for example, the master unit may be a screen control device that controls the content displayed on the in-vehicle information screen, or a monitoring device that detects abnormalities inside the vehicle from video footage from security cameras. 【0032】 Figure 2 is a block diagram showing an example configuration of the lighting fixture 2, and Figure 3 is a block diagram showing an example configuration of the master unit 1. 【0033】 The master unit 1 includes an operation unit 1A, a first control unit 1B, and a first communication module 1C. In this embodiment, the master unit 1 performs dimming control of the luminaire 2, which will be described later. Dimming control includes control related to the illumination emitted by the luminaire 2. For example, the master unit 1 can control the dimming rate of the luminaire 2 from 0% to 100%. 【0034】 The control unit 1A can control the dimming rate of the light fixture 2 by receiving input from a user or the like. In this embodiment, the control unit 1A outputs the dimming rate control, etc., input by remote operation from a user's (e.g., conductor's) PC to the first control unit 1B. However, it is not limited to this, and for example, the control unit 1A may have a switch that allows the user to select a predetermined brightness of the light fixture 2 based on the brightness (luminance or illuminance) of the surrounding environment, such as sunny or cloudy days, morning, noon, evening, or night. Alternatively, for example, the control unit 1A may be a touch panel, and the user may control the dimming rate of the light fixture 2 via the touch panel. In addition, the control unit 1A may be a display that shows the current status of the light fixture, such as the current dimming rate of the light fixture 2. 【0035】 The first control unit 1B performs dimming control of the luminaire 2 as described above. For example, dimming control means changing the dimming rate of the luminaire 2. That is, the first control unit 1B outputs a dimming control signal S1 to the luminaire 2 indicating that it will perform the above-mentioned dimming control. 【0036】 The first control unit 1B wirelessly generates multiple dimming control signals S1 at predetermined time intervals. In this embodiment, transmissions are made 10 times at 100ms intervals, but this is not limited to this; it could be at 10ms intervals or 5 times. The dimming control signal S1 also includes dimming rate information relating to the dimming rate of the light fixture 2 to be controlled, and transmission count information indicating which dimming control signal S1 has been transmitted. 【0037】 The first communication module 1C outputs (transmits) the dimming control signal S1 generated by the first control unit 1B to the light fixture 2. In this embodiment, the first communication module 1C uses a multi-hop communication standard using radio waves in the 2.4GHz band. 【0038】 As shown in Figure 2, the light fixture 2 includes a light-emitting unit 21, a constant current circuit 22, a second control unit 23, and a second communication module 24. 【0039】 The light-emitting unit 21 is configured to emit a sufficient amount of light to illuminate the passenger compartment. For example, multiple units may be arranged along the longitudinal direction, or they may be used in any number and arrangement configuration depending on the amount of light emitted from adjacent sub-units, advertisements inside the railway vehicle, the environment outside the railway vehicle, etc. In this embodiment, the light-emitting unit 21 incorporates multiple LED elements and emits light upon input from a DC power supply by a constant current circuit 22, which will be described later. The light-emitting unit 21 emits light with an illuminance corresponding to the magnitude of the input current. In this embodiment, the light-emitting unit 21 was an LED, but of course it is not limited to this and may be a fluorescent lamp. 【0040】 The constant current circuit 22 outputs a predetermined DC current from power P supplied from an external source. In this embodiment, power P is supplied to the constant current circuit 22 by an SIV (Static Inverter) that extracts, for example, AC 100V from a DC power source from an overhead line. 【0041】 The second control unit 23 controls the magnitude of the current supplied to the light-emitting unit 21 and the timing for changing the magnitude of the current supplied to the light-emitting unit 21. The second control unit 23 controls the constant current circuit 22 so that the current value necessary for the light-emitting unit 21 to emit light at a predetermined illuminance is obtained at a predetermined timing. The second control unit 23 can communicate with the master unit 1 via the second communication module 24 and controls the magnitude of the current supplied to the light-emitting unit 21 and the timing based on the dimming control signal S1 transmitted from the master unit 1. 【0042】 In other words, between the two luminaires (between the second communication modules 24), when the second communication module 24 of any of the luminaires 2 receives the dimming control signal S1 transmitted from the master unit 1, it transmits a dimming control signal S2. When the second communication module 24 of the other luminaire 2 receives the dimming control signal S2 transmitted from the master unit 1 or the other luminaire 2, it transmits a dimming control signal S3 again. In this way, the dimming control signal S is transmitted to all the luminaires. 【0043】 (Operation of the lighting system) Next, the operation of the lighting system 100 configured as described above will be explained. Figure 4 is a flowchart showing the processing of the master unit 1 of the lighting system 100, and Figure 5 is a flowchart showing the processing of the luminaire 2 of the lighting system 100. 【0044】 First, the processing procedure of the master unit 1 will be explained using Figure 4. The first control unit 1B sets the count number C to 0 in response to a dimming command input by the operation unit 1A that sets the dimming rate of the light fixture 2 to a predetermined value (for example, a dimming rate of 50%) (step S101). Here, the count number C is not only used to calculate the waiting time T, which will be described later, but also indicates how many times the dimming control signal S1 has been transmitted. In other words, the dimming control signal S1 transmitted when the count number C is 1 is the first dimming control signal S1 that is transmitted. 【0045】 Next, 1 is added to the count C, which is currently 0 (step S102). In other words, this process increases the count C by 1. 【0046】 Next, the first control unit 1B generates a dimming control signal S1 which includes dimming rate information that includes a dimming command to set the dimming rate of the light fixture 2 input from the operation unit 1A to a predetermined value, and transmission count information that indicates which time the dimming control signal S1 has been transmitted. The first communication module 1C then transmits the generated dimming control signal S1 (step S103). Here, the transmission count information of the dimming control signal S1 is the count number C. In other words, when the count number C = 1, it is the first transmission. 【0047】 Next, the first control unit 1B determines whether the count C is greater than or equal to the total number Z, which is the total number of times the dimming control signal S1 is transmitted. If the count C is greater than or equal to the total number Z, the process ends. If the count C is less than the total number Z, the process returns to step S102 (step S104). For example, if Z = 10 times and the count C = 10, the process ends because the dimming control signal S1 has been transmitted 10 times. If Z = 10 times and the count C = 9, the process returns to step S102 because the dimming control signal S1 needs to be transmitted one more time, and the process proceeds to step S103 after increasing the count C by 1. 【0048】 Next, the processing procedure for the lighting fixture 2 will be explained using Figure 5. The second communication module 24 receives the dimming control signal S1 (step S201). 【0049】 Next, the second control unit 23 compares the dimming rate information of the dimming control signal S1 received previously with the dimming rate information of the dimming control signal S1 received this time (step S202). In other words, if the previous dimming rate information indicated that the dimming rate of the luminaire 2 should be set to 50%, but the dimming rate information received this time indicates that the dimming rate of the luminaire 2 should be set to 70% (i.e., the dimming rate information is different), the result is YES. If the dimming rate (dimming rate information) is the same, the result is NO. If the result in step S202 is YES, the process proceeds to step S203. 【0050】 Next, if the answer in step S202 is YES, the second control unit 23 calculates the waiting time T (step S203). The waiting time T is expressed by the following formula. T=(Z-C)×H...(Formula 1) 【0051】 Z is the total number of times the dimming control signal S1 is transmitted, as described above. In this embodiment, Z=10, but it is not limited to this value, and Z=5, for example. H is the time interval at which the dimming control signal S1 is transmitted. In this embodiment, H is 100ms, but it is not limited to this value, and it is also 10ms. C is the count number described above, and if the count C is 1, then C=1. 【0052】 Next, the second control unit 23 waits for a calculated waiting time T after receiving the dimming control signal S1 (step S204). After waiting for the waiting time T, the second control unit 23 dims the light-emitting unit 21 to a predetermined dimming rate (step S205). As described above, the second control unit 23 controls the constant current circuit 22 so that the current value necessary for the light-emitting unit 21 to emit light at a predetermined illuminance is obtained. 【0053】 In other words, in this embodiment, by incorporating transmission count information (which number the dimming control signal S1 is being transmitted) into the dimming control signal S1 transmitted from the master unit 1, the luminaires 2 can all be dimmed simultaneously by waiting for a time corresponding to the number of transmissions. 【0054】 For example, suppose Z=10 and H=100ms, and luminaire 2a receives a dimming control signal S1 to set the dimming rate to 50% on the first attempt, and luminaire 2d receives a dimming control signal S1 to set the dimming rate to 50% on the eighth attempt. In this case, from equation 1 above, luminaire 2a will emit light 900ms after receiving the first dimming control signal S1, and luminaire 2d will emit light 200ms after receiving the eighth dimming control signal S1. Here, 700ms has passed from the transmission of the first dimming control signal S to the transmission of the eighth dimming control signal S1. As a result, all luminaires 2 can be dimmed simultaneously. 【0055】 (modified version) Figure 6 is a schematic diagram showing a modified lighting system 100' according to the present invention, and Figure 7 is a block diagram showing an example of the configuration of the luminaire 2 according to the modified invention. Hereinafter, configurations different from the first embodiment will be mainly described, and the same reference numerals will be used for components similar to those in the first embodiment, and their descriptions will be omitted or simplified. 【0056】 The lighting system 100' differs from the first embodiment in that it further includes a repeater 3. As shown in Figure 6, the repeater 3 is installed in the railway vehicle 10 and the railway vehicle 20, respectively, and receives signals transmitted from the master unit 1 or the lighting fixture 2. 【0057】 As mentioned above, the end structure 14 is provided with a metal door (end plate). This can sometimes interfere with wireless communication from the light fixture 2c closest to the door to the light fixture 2d closest to the door on the adjacent railway car 20. 【0058】 The repeater 3 then transmits the signal S1' (for example, a dimming control signal) transmitted from the light fixture 2 to the light fixture 2 of the adjacent railway car 20 or to the repeater 3. In this embodiment, the repeater 3 has a higher radio wave strength than the master unit 1 and light fixture 2 in order for the wireless signal to pass through the door. For example, the radio wave strength of the master unit 1 and light fixture 2 is -65 dBm, while the radio wave strength of the repeater 3 is -55 dBm. 【0059】 Furthermore, the repeater 3 is positioned near a door to facilitate communication with the lighting fixture 2 or repeater 3 located in the adjacent railway car 20. 【0060】 Furthermore, the second communication module 24 mounted on the light fixture 2c shown in Figure 7 receives signal S2' from other light fixtures and transmits signal S3' to the repeater 3a. Here, light fixture 2c is the light fixture located closest to the metal door (adjacent railway vehicle 20) provided on the end structure 14. 【0061】 The radio wave strength of the second communication module 24 is insufficient to transmit wireless communication to the lighting fixture 2d located in the adjacent railway car 20 through the door; therefore, communication is performed via the repeater 3a, which has a stronger radio wave strength. 【0062】 The communication module 3a' of the repeater 3a receives a signal from the lighting fixture 2d and transmits signal S4' to the repeater 3b located in the adjacent railway car 20. The lighting fixture 2d located in the adjacent railway car 20 receives the signal S4' transmitted from the communication module 3a' of the repeater 3b, and transmits its signal S5' to the lighting fixtures within the same railway car 20. 【0063】 In this way, the signal S1' from the master unit 1 is transmitted via each light fixture 2 to the light fixture 2c located closest to the adjacent railway car 20, then via the repeater 3a to the repeater 3b located in the adjacent railway car 20, and finally from the repeater 3b to the light fixture 2d. Through this exchange of signals S1' to S5', the signal is transmitted to all the light fixtures located in all the railway cars. 【0064】 As described above, even when metal doors are placed on the end structures 14 between railway cars, adding a repeater 3 with enhanced radio wave strength makes it possible to communicate wirelessly with adjacent railway cars 20 and even the last railway car. 【0065】 Furthermore, in Figure 6, since the railway vehicle 10 was the leading vehicle, only one repeater could be installed. However, this is not the only option, and two repeaters may be installed, one at the front and one at the rear in the direction of travel. In other words, the railway vehicle 10 may be equipped with repeater 3 and another repeater 3 located on the opposite side of that repeater 3. 【0066】 Furthermore, although the repeater 3 is provided independently of the lighting fixture 2 in Figures 6 and 7, this is not the only option. For example, the lighting fixture 2c located closest to the adjacent railway vehicle 20 may function as the repeater 3. For example, the radio wave strength of the second communication module 24 may be high. 【0067】 Furthermore, while Figure 7 shows communication from repeater 3a to repeater 3b in the adjacent railway vehicle 20, the communication is not limited to this. For example, communication may be performed from repeater 3 to a lighting fixture in the adjacent railway vehicle 20 (for example, the lighting fixture 2d closest to the door). In this case, the second communication module 24 of the lighting fixture 2d receives the signal S4' transmitted from the communication module 3a' of repeater 3a into the railway vehicle 20. 【0068】 Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and various modifications can be made, and the configurations of each embodiment and modified example may be combined. For example, although this embodiment describes a lighting system for controlling lighting fixtures installed in a railway vehicle, this lighting system may also be used to control lighting fixtures in booths where objects that obstruct communication, such as metal walls or partitions, are installed at predetermined intervals. [Explanation of symbols] 【0069】 1...Control device 1A…Operation unit 1B...First control unit 1C...First communication module 2…Lighting equipment 3… Repeater 5...Connection part 100... Lighting systems

Claims

[Claim 1] A lighting system provided in a railway vehicle having a first vehicle and a second vehicle connected to the first vehicle, A control device provided in the first vehicle that wirelessly transmits dimming control signals multiple times at predetermined time intervals, Multiple lighting fixtures provided in the first vehicle and the second vehicle, connected to each other by a multi-hop network, and receiving the dimming control signal. It is equipped with, The dimming control signal includes transmission count information indicating which time the dimming control signal has been transmitted, Each of the aforementioned plurality of luminaires comprises a light-emitting unit and a light-emitting timing control unit that controls the timing at which the light-emitting unit emits light based on the transmission count information. The radio wave intensity of the lamp located closest to the first vehicle among the plurality of lamps installed on the second vehicle is the strongest among the plurality of lamps installed on the second vehicle. Lighting system. [Claim 2] A lighting system according to claim 1, The light emission timing control unit, after receiving the dimming control signal, dims the light emission unit after a waiting period which is the product of the difference between the total number of times the dimming control signal is transmitted and the number of transmissions indicated in the transmission count information, and the predetermined time interval. Lighting system. [Claim 3] A lighting system according to claim 1, The control device transmits the dimming control signal via broadcast. Lighting system. [Claim 4] A lighting system according to claim 1, The second vehicle is connected to the third vehicle on the opposite side from the first vehicle. The radio wave intensity of the lights installed on the first vehicle side of the plurality of lights installed on the second vehicle is stronger than the radio wave intensity of the lights other than those installed on the third vehicle side. Lighting system. [Claim 5] A lighting system according to claim 1, Of the multiple lighting fixtures installed on the first vehicle, the radio wave intensity of the lighting fixture installed on the second vehicle side is the strongest among the multiple lighting fixtures installed on the first vehicle. Lighting system. [Claim 6] A railway vehicle having a first vehicle and a second vehicle connected to the first vehicle, wherein a control device provided in the first vehicle receives dimming control signals provided in the first vehicle and the second vehicle, which are connected to each other by a multi-hop network and transmitted wirelessly multiple times at predetermined intervals, wherein the lighting fixtures receive dimming control signals multiple times wirelessly at predetermined intervals, The dimming control signal includes transmission count information indicating which dimming control signal is being transmitted. Each of the aforementioned plurality of luminaires comprises a light-emitting unit and a light-emitting timing control unit that controls the timing at which the light-emitting unit emits light based on the transmission count information. The radio wave intensity of the lamp located closest to the first vehicle among the plurality of lamps installed on the second vehicle is the strongest among the plurality of lamps installed on the second vehicle. Light equipment. [Claim 7] A vehicle having a first vehicle and a second vehicle connected to the first vehicle, A control device provided in the first vehicle that wirelessly transmits dimming control signals multiple times at predetermined intervals, Multiple lighting fixtures provided in the first vehicle and the second vehicle, connected to each other by a multi-hop network, and receiving the dimming control signal. It has, The dimming control signal includes transmission count information indicating which dimming control signal is being transmitted. Each of the aforementioned plurality of luminaires comprises a light-emitting unit and a light-emitting timing control unit that controls the timing at which the light-emitting unit emits light based on the transmission count information. The radio wave intensity of the lamp located closest to the first vehicle among the plurality of lamps installed on the second vehicle is the strongest among the plurality of lamps installed on the second vehicle. Lighting system A vehicle equipped with [a certain feature].

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