Illumination control method, illumination control program, and illumination control system

Abstract

To provide an illumination control method, an illumination control program and an illumination control system, each enabling reduction of glare felt by a human with respect to illumination.SOLUTION: An illumination control method is provided, which is performed by a control device 10 controlling a plurality of illumination devices 20 installed in an illumination control area 100. The illumination control method comprises: identifying a human detection area being an area where at least one human exists, of a plurality of division areas into which the illumination control area 100 is divided; and making output of one or more target illumination devices which are illumination devices 20 corresponding to the human detection area smaller than output of peripheral illumination devices 20 while controlling illuminance of the human detection area to be more than or equal to target illuminance.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a lighting control method, a lighting control program, and a lighting control system. [Background technology]

[0002] As described in Patent Document 1, a lighting system is known that dims lighting fixtures when it detects the presence of a person. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-205151 A Summary of the Invention [Problem to be solved by the invention]

[0004] When a person is directly under a light that is turned on, the person may feel dazzled by the light.

[0005] An object of the present disclosure is to provide a lighting control method, a lighting control program, and a lighting control system that can reduce glare caused to humans by lighting. [Means for solving the problem]

[0006] A lighting control method according to an embodiment of the present disclosure is a method executed by a control device that controls a plurality of lighting devices installed in a lighting control area. The lighting control method includes identifying a human detection area, which is an area in which at least one human is present, among a plurality of divided areas obtained by dividing the lighting control area. The lighting control method includes controlling the illuminance of the human detection area to be equal to or higher than a target illuminance, while reducing the output of one or more target lighting devices, which are lighting devices corresponding to the human detection area, below the output of surrounding lighting devices.

[0007] A lighting control program according to an embodiment of the present disclosure is executed by a control device that controls a plurality of lighting devices installed in a lighting control area. The lighting control program causes the control device to identify a human detection area, which is an area in which at least one human is present, among a plurality of divided areas obtained by dividing the lighting control area. The lighting control program causes the control device to control the illuminance of the human detection area to be equal to or higher than a target illuminance, while causing the output of one or more target lighting devices, which are lighting devices corresponding to the human detection area, to be smaller than the output of surrounding lighting devices.

[0008] A lighting control system according to an embodiment of the present disclosure includes a plurality of lighting devices that illuminate a lighting control area, a control device that controls the plurality of lighting devices, and a detection device. The detection device identifies a human detection area, which is an area in which at least one human is present, among a plurality of divided areas obtained by dividing the lighting control area. The control device acquires information identifying the human detection area from the detection device. The control device controls the illuminance of the human detection area to be equal to or higher than a target illuminance, while reducing the output of one or more target lighting devices, which are lighting devices corresponding to the human detection area, below the output of surrounding lighting devices. Effect of the Invention

[0009] According to a lighting control method, a lighting control program, and a lighting control system according to an embodiment of the present disclosure, glare caused by lighting to humans is reduced. [Brief description of the drawings]

[0010] [Figure 1] 1 is a block diagram showing an example of the configuration of a lighting control system according to an embodiment; [Diagram 2] FIG. 2 is a schematic diagram showing a configuration example of a lighting control area. [Diagram 3] FIG. 11 is a plan view showing an example in which lighting devices are arranged in each divided area. [Figure 4] FIG. 11 is a plan view showing an example in which lighting devices are arranged in some of the divided areas. [Figure 5A]FIG. 13 is a schematic diagram showing a comparative example in which only the lighting devices corresponding to the human detection area are turned on; [Figure 5B] 10 is a schematic diagram showing an example of operation of the present embodiment in which a lighting device corresponding to a human detection area is turned off and surrounding lighting devices are turned on. FIG. [Figure 6A] FIG. 13 is a schematic diagram showing, as a comparative example, a case in which the outputs of illumination devices corresponding to two human detection areas are different. [Figure 6B] 10 is a schematic diagram showing an operation example of the present embodiment in which the outputs of illumination devices corresponding to two human detection areas are uniform. FIG. [Figure 7A] FIG. 13 is a schematic diagram showing, as a comparative example, a case in which only the lighting device corresponding to the human detection area is turned on, and the outputs of the lighting devices corresponding to each of the two human detection areas are different. [Figure 7B] FIG. 11 is a schematic diagram showing an example of operation of this embodiment in which the output of a lighting device corresponding to a human detection area is lower than the output of the surrounding lighting devices, and the output of the lighting devices corresponding to each of the two human detection areas is uniform. [Figure 8] FIG. 13 is a diagram showing an example of an illuminance setting screen. [Figure 9] 10 is a flowchart showing an example of the procedure of a lighting control method for optimizing the output of a lighting device based on an illuminance table. [Figure 10] 10 is a flowchart showing an example of the procedure of a lighting control method for optimizing the output of a lighting device based on the result of measuring illuminance. [Figure 11] 10 is a flowchart showing an example of the procedure of a lighting control method for optimizing the output of a lighting device when a human detection area changes. [Figure 12] 10 is a flowchart showing an example of the procedure of a lighting control method for optimizing the output of a lighting device when the measurement result of illuminance changes. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] (Example of the configuration of lighting control system 1) 1, a lighting control system 1 according to an embodiment includes a control device 10, a lighting device 20, a detection device 30, a setting terminal 40, and a measurement device 50. The control device 10 is communicatively connected to the lighting device 20, the detection device 30, the setting terminal 40, and the measurement device 50 via a network 70. The control device 10 may also be communicatively connected to the lighting device 20, the detection device 30, etc., without via the network 70.

[0012] The lighting control system 1 controls the state of lighting in a lighting controlled area 100 illustrated in Fig. 2. The lighting controlled area 100 may include various spaces for which lighting is to be controlled, such as an office, a conference room, or a classroom. The lighting controlled area 100 is a space surrounded by a ceiling 110 and a floor 120. The lighting controlled area 100 may be configured to allow external light to enter through a window or the like.

[0013] In this embodiment, humans including subjects 81 and 82 are present in the lighting control area 100. The lighting control system 1 controls the illuminance distribution of the lighting control area 100 according to the position where the humans are present. The detection device 30 detects in which of the multiple divided areas into which the lighting control area 100 is divided the humans are located. The control device 10 controls the output of the lighting device 20 based on the detection result of the position of the humans. Specifically, the control device 10 limits the output of the lighting device 20 corresponding to the position where the humans are present. The lighting device 20 corresponding to the position where the humans are present may include the lighting device 20 installed directly above the humans. Directly above the humans includes vertically above the humans' heads. Directly above the humans may include a range extending from the humans' heads at a predetermined solid angle. Directly above the humans may include a range where the light-emitting parts of the lighting devices 20 are directly visible to the humans.

[0014] The lighting control system 1 may set the illuminance in a divided area where a person is present and the illuminance in a divided area where no person is present, using the setting terminal 40. The lighting control system 1 may measure the illuminance distribution in the lighting control area 100 using the measuring device 50, and control the output of the lighting device 20 based on the measurement result of the illuminance distribution and the detection result of the position of the person. The lighting control system 1 does not have to include at least one of the setting terminal 40 or the measuring device 50, or both the setting terminal 40 and the measuring device 50.

[0015] In this embodiment, it is assumed that a subject 81 carries a mobile terminal 41. It is assumed that a subject 82 carries a mobile terminal 42. It is also assumed that a lighting device 20 is installed on a ceiling 110. It is also assumed that a camera 31 and a beacon 33 are installed on the ceiling 110. It is also assumed that an NFC (Near Field Communication) tag 32 and a wireless communication router 71 are installed on a floor 120. The camera 31, the NFC tag 32, or the beacon 33 can function as a detection device 30. The camera 31 can function as a measurement device 50. The wireless communication router 71 can function as a network 70.

[0016] An example of the configuration of each part of the lighting control system 1 will be described below.

[0017] <Control device 10> The control device 10 includes a calculation unit 12, a storage unit 14, and an interface 16. The calculation unit 12 calculates and controls the output of the lighting device 20. The calculation unit 12 may include at least one processor. The processor may execute programs that realize various functions of the control device 10. The processor may be realized as a single integrated circuit. The integrated circuit is also called an IC (Integrated Circuit). The processor may be realized as a plurality of integrated circuits and discrete circuits that are communicatively connected. The processor may be realized based on various other known technologies.

[0018] The storage unit 14 may include, for example, an electromagnetic storage medium such as a magnetic disk, or may include a memory such as a semiconductor memory or a magnetic memory. The storage unit 14 may store various information referenced in the operation of the control device 10 and programs for implementing various functions of the control device 10. The storage unit 14 may function as a work memory for the calculation unit 12. The storage unit 14 may be configured integrally with the calculation unit 12, or may be configured separately from the calculation unit 12.

[0019] The interface 16 may be configured to include a communication module that communicates with an external device such as the lighting device 20 or the detection device 30. The communication module may be compatible with a mobile communication standard such as 4G (4th Generation) or 5G (5th Generation). The communication module may be compatible with a communication standard such as LAN (Local Area Network). The communication module may be compatible with a wired or wireless communication standard. The communication module is not limited to these and may be compatible with various communication standards. The interface 16 may be configured to be connectable to an external communication module.

[0020] The interface 16 may be configured to include an input device that accepts input of information or data from a user. The input device may be configured to include, for example, a touch panel or a touch sensor, or a pointing device such as a mouse. The input device may be configured to include physical keys. The input device may be configured to include a voice input device such as a microphone. The interface 16 may be configured to be connectable to an external input device such as a setting terminal 40.

[0021] The interface 16 may be configured to include an output device that outputs information or data to a user. The output device may include, for example, a display device that outputs visual information such as an image, character, or figure. The display device may include, for example, an LCD (Liquid Crystal Display), an organic EL (Electro-Luminescence) display, an inorganic EL display, or a PDP (Plasma Display Panel). The display device is not limited to these displays and may include displays of various other types. The display device may include a light-emitting device such as an LED (Light Emitting Diode) or an LD (Laser Diode). The display device may include various other devices. The output device may include, for example, an audio output device such as a speaker that outputs auditory information such as sound. The output device may include, for example, a vibration device such as a vibrator that outputs tactile information such as vibration. The output device is not limited to these examples and may include various other devices. The interface 16 may be configured to be connectable to an external output device.

[0022] <Lighting device 20> The lighting device 20 emits illumination light. The lighting device 20 includes various light sources such as LEDs (Light Emitting Diodes). In this embodiment, the lighting device 20 is configured as a glareless downlight. A glareless downlight is a light having a narrower light distribution angle than a normal downlight. The lighting device 20 is not limited to a glareless downlight and may be configured in various other ways.

[0023] The number of lighting devices 20 installed in the lighting control area 100 is not limited to six as shown in Fig. 2, and may be five or less, or seven or more. When a plurality of lighting devices 20 are installed in the lighting control area 100, the lighting devices 20 may be configured so that the on / off state of each lighting device 20 can be individually controlled. The intensity of light emitted by each lighting device 20 may be individually controllable. In other words, the output of each lighting device 20 may be individually controllable.

[0024] <Detection device 30> The detection device 30 detects the position of a person present in the lighting-controlled area 100, and outputs the detection result to the control device 10. The detection device 30 may include a camera 31. The camera 31 may photograph the lighting-controlled area 100 and detect the position of the person by image processing. The camera 31 is configured to include an image sensor that electronically captures an image, and is configured as, for example, a network camera. The camera 31 may be configured to include, as an image sensor, a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) sensor, or the like.

[0025] The detection device 30 may include an NFC tag 32. The NFC tag 32 detects that the mobile terminal 41 or 42 is located in the vicinity of the NFC tag 32 by communicating with the mobile terminal 41 or 42. The NFC tag 32 may output a detection result of the position of the mobile terminal 41 to the control device 10 as a detection result of the position of the subject 81 who is carrying the mobile terminal 41. The NFC tag 32 may output a detection result of the position of the mobile terminal 42 to the control device 10 as a detection result of the position of the subject 82 who is carrying the mobile terminal 42.

[0026] The detection device 30 may include a beacon 33. The beacon 33 detects the position of the mobile terminal 41 or 42 by communicating with the mobile terminal 41 or 42. The beacon 33 may output the detection result of the position of the mobile terminal 41 to the control device 10 as the detection result of the position of the subject 81 who carries the mobile terminal 41. The beacon 33 may output the detection result of the position of the mobile terminal 42 to the control device 10 as the detection result of the position of the subject 82 who carries the mobile terminal 42.

[0027] The detection device 30 is not limited to these examples, and may be configured to include various other devices such as a human presence sensor or a proximity sensor.

[0028] <Setting terminal 40> The setting terminal 40 is used to set the illuminance or the control mode of the lighting device 20 in the lighting control area 100. The setting terminal 40 may include an input device. The input device may be configured the same as or similar to the input device of the interface 16 of the control device 10. The setting terminal 40 may include an output device. The output device may be configured the same as or similar to the output device of the interface 16 of the control device 10.

[0029] The function of the setting terminal 40 may be realized by the mobile terminal 41 or 42. That is, the mobile terminal 41 or 42 may function as the setting terminal 40. The setting terminal 40 or the mobile terminal 41 or 42 may be configured to include a smartphone or a tablet, or may be configured to include a notebook PC (Personal Computer), etc.

[0030] <Measuring device 50> The measuring device 50 measures the illuminance of the lighting-controlled area 100 and outputs the illuminance measurement result to the control device 10. The measuring device 50 may be configured to measure the illuminance of at least a part of the lighting-controlled area 100. The measuring device 50 may be configured to measure the illuminance distribution of the lighting-controlled area 100. The measuring device 50 may be configured to include an illuminance sensor. The measuring device 50 may be configured to include a camera 31. The camera 31 may calculate the illuminance of the lighting-controlled area 100 based on the luminance of an image captured of the lighting-controlled area 100.

[0031] (Example of operation of lighting control system 1) The lighting control system 1 detects the position of a person present in the lighting control area 100 by the detection device 30, and limits the output of the lighting device 20 corresponding to the position of the person by the control device 10. An example of the operation of the lighting control system 1 will be described below.

[0032] <Correspondence between divided areas and lighting devices 20> In the lighting control system 1, the lighting control area 100 is divided into a plurality of divided areas in order to associate the positions of people with the lighting devices 20. The divided areas are each of a plurality of areas into which the lighting control area 100 is divided.

[0033] The position of a human being is represented as in which of the multiple divided areas a human being is present. A divided area in which the presence of at least one human is detected is also referred to as a human detection area. A divided area in which the presence of no human is detected is also referred to as a non-human detection area. Based on the detection result of the human position obtained from the detection device 30, the control device 10 identifies a divided area in which the presence of at least one human is detected as a human detection area.

[0034] The position of the lighting device 20 is expressed as which divided area the lighting device 20 is installed in. The divided area in which the lighting device 20 is installed is also referred to as a lighting installation area. The divided area in which the lighting device 20 is not installed is also referred to as a lighting non-installation area.

[0035] As illustrated in Fig. 3 and Fig. 4, the lighting control area 100 may be divided into a plurality of divided areas represented by dashed rectangles. In the example of Fig. 3, the lighting control area 100 is divided into three divided areas 101, 102, and 103. In the example of Fig. 4, the lighting control area 100 is divided into 27 divided areas. In both Fig. 3 and Fig. 4, it is assumed that a light 21 is installed as the lighting device 20 in the divided area 101. It is assumed that a light 22 is installed as the lighting device 20 in the divided area 102. It is assumed that a light 23 is installed as the lighting device 20 in the divided area 103.

[0036] In the example of Fig. 3, one lighting device 20 is installed in one divided area. That is, the divided areas and the lighting devices 20 may correspond one-to-one. On the other hand, in the example of Fig. 4, the lighting devices 20 are installed only in some of the divided areas. Conversely, there may be a non-lighting area where no lighting device 20 is installed.

[0037] A lighting installation area is associated with the lighting device 20 installed in that lighting installation area. On the other hand, a non-lighting installation area may be associated with the lighting device 20 installed in a lighting installation area adjacent to the non-lighting installation area or within a predetermined range from the non-lighting installation area. Conversely, a non-lighting installation area located around a lighting installation area may be associated with the lighting device 20 installed in that lighting installation area. Being located around a lighting installation area includes being adjacent to the lighting installation area or being located within a predetermined range from the lighting installation area.

[0038] In the example of Fig. 4, eight divided areas adjacent to divided area 101 in which light 21 is installed are associated with light 21 together with divided area 101. Eight divided areas adjacent to divided area 102 in which light 22 is installed are associated with light 22 together with divided area 102. Eight divided areas adjacent to divided area 103 in which light 23 is installed are associated with light 23 together with divided area 103.

[0039] A plurality of divided areas associated with one lighting device 20 are regarded as one group, and are also referred to as an area group. An area group is a group including the divided area in which one lighting device 20 is installed and the divided areas surrounding it.

[0040] 4, area group 201 includes nine divided areas, consisting of divided area 101 in which light 21 is installed and eight divided areas adjacent to divided area 101. Area group 202 includes nine divided areas, consisting of divided area 102 in which light 22 is installed and eight divided areas adjacent to divided area 102. Area group 203 includes nine divided areas, consisting of divided area 103 in which light 23 is installed and eight divided areas adjacent to divided area 103.

[0041] The combination of divided areas included in an area group is not limited to the combination of an illuminated area and an adjacent non-illuminated area as exemplified in Fig. 4. The divided areas included in an area group may be combined in any manner.

[0042] Furthermore, one non-lighting installation area may be associated with multiple lighting devices 20. One lighting installation area may be associated with not only the lighting device 20 installed in that lighting installation area, but also other lighting devices 20. In other words, a divided area may be associated with at least one lighting device 20. Conversely, there may be a divided area that is not associated with a lighting device 20.

[0043] <Identifying human detection areas> The detection device 30 detects the position of a human and outputs the position to the control device 10. The control device 10 specifies a divided area in which the presence of a human is detected as a human detection area based on the detection result of the position of the human. Conversely, the control device 10 may specify a divided area in which the presence of a human is not detected as a human non-detection area.

[0044] A human may be located on the boundary between multiple divided areas. That is, a human may be located so as to be included in multiple divided areas. When a human is located so as to be included in multiple divided areas, the presence of one human is detected in multiple divided areas. Multiple divided areas may be identified as human detection areas due to the presence of one human.

[0045] The control device 10 may represent the detection result of the presence of a human in each divided area as binary information indicating whether or not a human is present. The control device 10 may represent the detection result of the presence of a human in each divided area as a probability that a human is present in each divided area. When the probability that a human is present in a certain divided area is not zero, the control device 10 may determine that a human is present in that divided area and identify that divided area as a human detection area. When the probability that a human is present in a certain divided area is equal to or greater than a predetermined threshold, the control device 10 may determine that a human is present in that divided area and identify that divided area as a human detection area.

[0046] <Control of output of lighting device 20> The control device 10 controls the lighting device 20 based on the target illuminance set for each divided area of ​​the lighting control area 100. The control device 10 may calculate the output of the lighting device 20 so that the illuminance of each divided area approaches the target illuminance set for each divided area, and control the lighting device 20. The control device 10 may set a target illuminance for the human detection area. The target illuminance set for the human detection area is also referred to as the detection area illuminance. The control device 10 may set a target illuminance for the human non-detection area. The target illuminance set for the human non-detection area is also referred to as the non-detection area illuminance. The detection area illuminance may be set to a value greater than the non-detection area illuminance. The control device 10 may not set a target illuminance for the human non-detection area, but may calculate the output of the lighting device 20 so as to reduce the illuminance of the human non-detection area as much as possible, and control the lighting device 20.

[0047] The control device 10 may calculate the output of the lighting device 20 so that the difference between the illuminance of each divided area and the target illuminance set for each divided area falls within a predetermined range, and control the lighting device 20. The difference between the illuminance of each divided area and the target illuminance set for each divided area may be expressed as an absolute value of the illuminance, or may be expressed as a percentage of the target illuminance.

[0048] The control device 10 may calculate the output of the lighting device 20 so that the illuminance of each divided area is equal to or higher than the target illuminance set for each divided area, and control the lighting device 20. The control device 10 may calculate the output of the lighting device 20 so that the illuminance of the human detection area is equal to or higher than the detection area illuminance, and the illuminance of the human non-detection area is equal to or lower than the non-detection area illuminance, and control the lighting device 20.

[0049] The control device 10 may control the lighting devices 20 by calculating the output of the lighting devices 20 so that the sum of the outputs of all the lighting devices 20 installed in the lighting control area 100 is minimized, on the premise that the lighting devices 20 are controlled based on the target illuminance set for each divided area of ​​the lighting control area 100. By minimizing the sum of the outputs of the lighting devices 20, power saving of the lighting devices 20 is realized.

[0050] The control device 10 may calculate the output of each lighting device 20 by solving a linear programming problem that minimizes the value of an evaluation function including the output of each lighting device 20 installed in the lighting control area 100. The evaluation function may include the sum of the outputs of all the lighting devices 20 installed in the lighting control area 100. In other words, the evaluation function may include the sum of the outputs of all the lighting devices 20 as a term representing power saving of the lighting devices 20.

[0051] The linear programming problem may include, as a constraint condition for the illuminance of each divided area, a condition that the illuminance of each divided area is equal to or greater than a target illuminance set for each divided area. The illuminance of each divided area may be calculated by the sum of the products of the output of each lighting device 20 and a coefficient representing the degree to which each lighting device 20 contributes to the illuminance of each divided area. The control device 10 may obtain the coefficient representing the degree to which each lighting device 20 contributes to the illuminance of each divided area as an illuminance table stored in advance in the storage unit 14, or may obtain the coefficient from an external database. The illuminance table is a table including coefficients representing the degree to which each lighting device 20 installed in the lighting control area 100 contributes to the illuminance of each divided area of ​​the lighting control area 100. The linear programming problem may include, as a constraint condition for the output of each lighting device 20, that the output of each lighting device 20 is equal to or greater than zero and equal to or less than the upper output limit of each lighting device 20.

[0052] <Reduction in output of target lighting equipment> The control device 10 controls the output of the lighting device 20 corresponding to the human detection area so that the human does not feel the lighting is too dazzling while maintaining the illuminance of the human detection area at a set illuminance. The lighting device 20 corresponding to the human detection area is also referred to as a target lighting device. The control device 10 can identify one or more target lighting devices by identifying the human detection area. The one or more target lighting devices are hereinafter simply referred to as target lighting devices. The control device 10 may reduce the output of the target lighting device. The control device 10 may make the output of the target lighting device smaller than the output of the lighting device 20 around the target lighting device. The control device 10 may turn off the target lighting device.

[0053] The control device 10 may use an evaluation function that takes into consideration that the output of the target lighting device is smaller than the output of the surrounding lighting devices 20 in the linear programming problem. Specifically, the evaluation function may include a sum of the outputs of the target lighting devices as a term representing that the output of the target lighting device is smaller than the output of the surrounding lighting devices 20. In other words, the evaluation function may be expressed as a sum of a term representing the sum of the outputs of all the lighting devices 20 installed in the lighting control area 100 and a term representing the sum of the outputs of one or more target lighting devices. By calculating the output of each lighting device 20 so that the value of the evaluation function including the term representing that the output of the target lighting device is reduced is minimized, the output of the target lighting device may become smaller than the output of the surrounding lighting devices 20.

[0054] The evaluation function may include a term representing the sum of values ​​obtained by multiplying the output of one or more target lighting devices by a first coefficient as a term representing reducing the output of the target lighting devices. The control device 10 can adjust the weighting between the term representing power saving of the lighting device 20 and the term representing reducing the output of the target lighting devices by changing the value set in the first coefficient.

[0055] The linear programming problem may include, as a constraint on the output of each lighting device 20, that the output of the target lighting device be smaller than the output of the surrounding lighting devices 20. In this way, the output of the target lighting device is smaller than the output of the surrounding lighting devices 20.

[0056] 3 and 4, assuming that the lighting device 20 corresponding to the human detection area is the light 22, the lights 21 and 23 may be lighting devices 20 around the light 22. In other words, when a plurality of lighting devices 20 are arranged at lattice points, the lighting devices 20 around the target lighting device may include the lighting devices 20 located at lattice points adjacent to the target lighting device. Also, the lighting devices 20 around the target lighting device may include the lighting devices 20 located within a predetermined range from the target lighting device.

[0057] As shown in Fig. 5A and Fig. 5B, assume that lights 21, 22, and 23 are installed and a target person 80 is detected who is located directly below the light 22. In a comparative example shown in Fig. 5A, the control device 10 controls the lighting device 20 so that the light 22 installed directly above the target person 80 is turned on and the lights 21 and 23 around the target person 80 are turned off. On the other hand, in an operation example of the present embodiment shown in Fig. 5B, the control device 10 controls the lighting device 20 so that the light 22 installed directly above the target person 80 is turned off and the lights 21 and 23 around the target person 80 are turned on.

[0058] In the comparative example of Fig. 5A, the illumination light 22L of the light 22 illuminates the subject 80 from a direction directly above the subject 80. On the other hand, in the operation example of this embodiment of Fig. 5B, the illumination light 21L of the light 21 and the illumination light 23L of the light 23 illuminate the subject 80 from a direction oblique to directly above the subject 80. By being illuminated from a direction oblique to directly above the subject 80, the subject 80 is less likely to feel the illumination as dazzling.

[0059] As described above, the lighting control system 1 of this embodiment can reduce the glare caused by the lighting to the subject human 80 by making the output of the lighting device 20 corresponding to the human detection area smaller than the output of the surrounding lighting devices 20.

[0060] In addition, in the comparative example of FIG. 5A, the subject 80 may have difficulty seeing his / her own hands due to the shadow of the subject 80 caused by lighting from directly above the subject 80. On the other hand, in the operation example of this embodiment of FIG. 5B, the shadow of the subject 80 is less likely to be caused by lighting from an oblique direction of the subject 80. Therefore, the subject 80 is less likely to be bothered by the shadow of the subject 80. As a result, the comfort of the human subject 80 is maintained or improved.

[0061] <Uniform output of target lighting devices> The presence of a human may be detected in each of the divided areas of the lighting control area 100. That is, the control device 10 may detect a plurality of human detection areas. When a plurality of human detection areas are close to each other, one human detection area is affected not only by the lighting device 20 installed in the human detection area itself, but also by the lighting device 20 installed in the nearby human detection area. That is, the human detection areas located close to each other are influenced by the target lighting devices on the humans present in each area. If the outputs of the target lighting devices located close to each other are different, the humans located under the respective target lighting devices may feel uncomfortable due to the difference in the intensity of the light irradiated on each other's faces. As a result, the comfort of the humans located under the respective target lighting devices when talking or working together may be impaired.

[0062] Therefore, the control device 10 may control the output of each lighting device 20 in the lighting control area 100 so as to reduce the difference in output between multiple target lighting devices located within a predetermined range. In other words, the control device 10 may equalize the output of each of multiple target lighting devices located within a predetermined range. The predetermined range is a range in which a user desires the output of the lighting devices 20 to be equalized, and may be set arbitrarily by the user. The predetermined range may be set as a range in which humans recognize differences in light intensity.

[0063] The control device 10 may use an evaluation function that takes into consideration the uniformization of the outputs of a plurality of target lighting devices located within a predetermined range in the linear programming problem. Specifically, the evaluation function may include a sum of the absolute values ​​of the differences between the average value of the outputs of the target lighting devices located within the predetermined range and each lighting device 20 as a term representing the uniformization of the outputs of the target lighting devices. In other words, the evaluation function may be expressed as the sum of a term of the sum of the outputs of all the lighting devices 20 installed in the lighting control area 100 and a term of the sum of the absolute values ​​of the differences between the average value of the outputs of the target lighting devices located within the predetermined range and each lighting device 20. By calculating the outputs of the lighting devices 20 so that the value of the evaluation function including the term representing the uniformization of the outputs of the target lighting devices is minimized, the difference in the outputs of the target lighting devices located within the predetermined range may be reduced.

[0064] The evaluation function may include, as a term representing uniformity of the output of the target lighting devices, a term obtained by multiplying the sum of the absolute values ​​of the differences between the average output of the target lighting devices located within a predetermined range and each lighting device 20 by a second coefficient. The control device 10 can adjust the weighting of the term representing power saving of the lighting device 20 and the term representing uniformity of the output of the target lighting devices by changing the value set for the second coefficient.

[0065] 6A and 6B, assume that lights 24 and 25 are installed and a subject 83 located directly below light 24 and a subject 84 located directly below light 25 are detected. In the comparative example shown in FIG. 6A, the control device 10 controls the lighting device 20 so that the output of light 24 installed directly above subject 83 is smaller than the output of light 25 installed directly above subject 84.

[0066] On the other hand, in an operation example of this embodiment shown in FIG. 6B, the control device 10 controls the lighting device 20 so that the output of the light 24 installed directly above the subject 83 and the output of the light 25 installed directly above the subject 84 are uniform.

[0067] In the comparative example of FIG. 6A, the intensity of the illumination light 24L illuminating the subject 83 is smaller than the intensity of the illumination light 25L illuminating the subject 84. On the other hand, in the operation example of this embodiment of FIG. 6B, the intensity of the illumination light 24L illuminating the subject 83 is approximately the same as the intensity of the illumination light 25L illuminating the subject 84. The subjects 83 and 84 are unlikely to feel uncomfortable because the intensities of the light irradiated on each other's faces are approximately the same. As a result, the comfort of the subjects 83 and 83, who are located under different target lighting devices, when they talk or work together is maintained or improved.

[0068] <Reduction and uniformity of output from target lighting devices> The control device 10 may control the output of each lighting device 20 so as to achieve both reducing the output of the target lighting device and reducing the difference in output between target lighting devices located within a predetermined range.

[0069] The control device 10 may use an evaluation function including both a term representing the reduction of the output of the target lighting device and a term representing the uniformity of the output of the target lighting device within a predetermined range. Specifically, the evaluation function may be expressed as a sum of a term representing the sum of the output of each of all lighting devices 20 installed in the lighting control area 100, a term representing the sum of the output of the target lighting device, and a term representing the sum of the absolute values ​​of the differences between the average value of the output of each target lighting device located within a predetermined range and each lighting device 20. By calculating the output of each lighting device 20 so that the value of the evaluation function including both a term representing the reduction of the output of the target lighting device and a term representing the uniformity of the output of the target lighting device within a predetermined range is minimized, both the reduction of the output of the target lighting device and the uniformity of the output of the target lighting device located within a predetermined range can be realized.

[0070] The control device 10 may set the first coefficient by which the term representing reducing the output of the target lighting device is multiplied and the second coefficient by which the term representing uniforming the output of the target lighting device is multiplied to different values ​​or to the same value.

[0071] As shown in Figures 7A and 7B, when lights 26, 27, 28, and 29 are installed, a subject 85 located directly below light 27 and a subject 86 located directly below light 28 are detected.

[0072] 7A, the control device 10 controls the lighting device 20 so that the lights 27 and 28 installed directly above the subjects 85 and 86 are turned on and the lights 26 and 29 around them are turned off. The control device 10 also controls the lighting device 20 so that the output of the light 27 installed directly above the subject 85 is smaller than the output of the light 28 installed directly above the subject 86.

[0073] 7B, the control device 10 controls the lighting device 20 so that the output of the lights 27 and 28 installed directly above the subjects 85 and 86 is smaller than the output of the lights 26 and 29 around them. The control device 10 also controls the lighting device 20 so that the output of the light 27 installed directly above the subject 85 is smaller than the output of the light 28 installed directly above the subject 86.

[0074] In the comparative example of FIG. 7A, the illumination light 27L of the light 27 illuminates the subject 85 from a direction directly above the subject 85. Also, the illumination light 28L of the light 28 illuminates the subject 86 from a direction directly above the subject 86. On the other hand, in the operation example of this embodiment of FIG. 7B, the illumination light 26L of the light 26 and the illumination light 29L of the light 29 illuminate the subjects 85 and 86 from a direction diagonal to the subjects 85 and 86 from a direction directly above the subjects 85 and 86. Also, the intensity of the illumination lights 27L and 28L that illuminate the subjects 85 and 86 from a direction directly above the subjects 85 and 86 is weak. The subjects 85 and 86 are less likely to feel dazzled by the illumination because the light that illuminates them from directly above is weaker than the light that illuminates them from a direction diagonal to the direction directly above.

[0075] In addition, in the comparative example of FIG. 7A, the intensity of the illumination light 27L illuminating the subject 85 is smaller than the intensity of the illumination light 28L illuminating the subject 86. On the other hand, in the operation example of this embodiment of FIG. 7B, the intensity of the illumination light 27L illuminating the subject 85 is approximately the same as the intensity of the illumination light 28L illuminating the subject 86. The subjects 85 and 86 are unlikely to feel uncomfortable because the intensities of the light irradiated on each other's faces are approximately the same. As a result, comfort is maintained or improved when people located under different target illumination devices talk or work together.

[0076] As described above, by both reducing the output of the target lighting devices and reducing the difference in output between target lighting devices located within a specified range, the comfort of the subjects 85 and 86 in the lighting control area 100 is maintained or improved.

[0077] <Example of operation input> As illustrated in FIG. 8, the lighting control system 1 may display an illuminance setting screen 300 on the setting terminal 40, and receive an input for setting an illuminance or an input for instructing execution of optimization of the lighting device 20 from the user.

[0078] The illuminance setting screen 300 may include an illuminance setting frame 310 including a frame for inputting a target illuminance to be set in a human detection area and a frame for inputting a target illuminance to be set in a non-human detection area.

[0079] The illuminance setting screen 300 may include a function setting frame 320 including a frame for inputting whether to turn on or off the function of limiting output directly above, and a frame for inputting whether to turn on or off the function of equalizing output directly above. The output limiting directly above corresponds to making the output of the target lighting device smaller than the output of the surrounding lighting devices 20. The equalizing output directly above corresponds to making the difference in output of the target lighting device within a predetermined range smaller. Turning on a function means enabling the function or using the function. Turning off a function means disabling the function or not using the function.

[0080] The illuminance setting screen 300 may include a setting button 330 for reflecting the contents inputted into the illuminance setting frame 310 and the function setting frame 320 in the control by the control device 10. When the setting button 330 is touched, clicked or pressed, the contents inputted into the illuminance setting frame 310 and the function setting frame 320 may be outputted from the setting terminal 40 to the control device 10.

[0081] The control device 10 may not constantly optimize the output of the lighting devices 20, but may optimize the output in response to an operation from a user. In order to optimize the output of the lighting devices 20, the lighting devices 20 may recalculate the output of each lighting device 20 based on the detection result of a human being when the optimization is performed. The illuminance setting screen 300 may include an optimization button 340 for instructing the control device 10 to optimize the output of the lighting devices 20. An instruction to optimize the output of the lighting devices 20 may be output from the setting terminal 40 to the control device 10 by touching, clicking, or pressing the optimization button 340.

[0082] The control device 10 may optimize the output of the lighting device 20 at a predetermined time interval, regardless of whether the optimization button 340 is operated. The predetermined time interval may be a fixed time interval or an indefinite time interval. The predetermined time interval may be appropriately set by the user. The control device 10 may optimize the output of the lighting device 20 when the position of the human detection area changes due to a change in the human detection result as described below, or when the measurement result of the illuminance of the lighting control area 100 or the human detection area changes.

[0083] <Example of lighting control procedure> The control device 10 may execute a lighting control method including the steps of the flowchart illustrated in Fig. 9 in order to calculate the output of the lighting device 20 according to the position of a person in the lighting control area 100 and control the lighting device 20. The lighting control method may be realized as a lighting control program executed by a processor constituting the control device 10. The lighting control program may be stored in a non-transitory computer-readable medium.

[0084] The control device 10 sets a target illuminance for the human detection area (step S1). The control device 10 may further set a target illuminance for the non-human detection area. The control device 10 judges whether to start optimizing the output of the lighting device 20 (step S2). The control device 10 judges to start optimizing the output of the lighting device 20 when it receives an instruction for optimization, when a regular timing arrives, or when the human detection result or the illuminance measurement result changes. When the control device 10 does not judge to start optimizing the output of the lighting device 20 (step S2: NO), it repeats the judgment procedure of step S2. The control device 10 may return to the setting procedure of step S1.

[0085] When the control device 10 determines to start optimizing the output of the lighting devices 20 (step S2: YES), it acquires the detection result of the human presence in the lighting-controlled area 100 from the detection device 30 (step S3). The control device 10 acquires the illuminance table from the storage unit 14 (step S4). As described above, the illuminance table includes coefficients representing the degree to which each lighting device 20 installed in the lighting-controlled area 100 contributes to the illuminance of each divided area of ​​the lighting-controlled area 100.

[0086] The control device 10 calculates and determines the output of each lighting device 20 in the lighting control area 100 (step S5). Specifically, the control device 10 identifies a human detection area based on the human detection result acquired in the procedure of step S3. The control device 10 identifies a constraint condition of an evaluation function based on the target illuminance of the human detection area set in the procedure of step S1 and the illuminance table acquired in the procedure of step S4. The control device 10 can calculate the output of each lighting device 20 by solving a linear programming problem so that the value of the evaluation function is minimized.

[0087] The control device 10 controls each lighting device 20 so that the output of each lighting device 20 becomes the calculated value (step S6). After executing the procedure of step S6, the control device 10 ends the execution of the procedure of the flowchart in FIG.

[0088] <Summary> As described above, the lighting control system 1 according to this embodiment can reduce glare from lighting to humans by making the output of a target lighting device, which is a lighting device 20 directly above a person, smaller than the output of surrounding lighting devices 20. Also, human comfort can be maintained or improved.

[0089] The lighting control system 1 reduces the difference in output between multiple target lighting devices located within a predetermined range, so that the intensity of light irradiated to people under each target lighting device becomes similar. By making the light intensities similar, people are less likely to feel uncomfortable around each other. As a result, comfort is maintained or improved when people under different target lighting devices talk or work together.

[0090] (Other embodiments) An example of the configuration of a lighting control system 1 according to another embodiment will be described below.

[0091] <Control of the lighting device 20 based on the measurement result of illuminance> In the operation example of the embodiment described above, the control device 10 calculates the output of the lighting device 20 based on the illuminance table. The control device 10 may calculate the output of the lighting device 20 based on the measurement result of the illuminance of the lighting-controlled area 100 by the measurement device 50.

[0092] The control device 10 may calculate the difference between the target illuminance and the measured illuminance as the illuminance deficiency. The control device 10 may calculate an increase in the output of the lighting device 20 required to compensate for the illuminance deficiency, and control the lighting device 20 based on the calculated increase.

[0093] The control device 10 may measure the illuminance of some divided areas of the lighting control area 100. The control device 10 may calculate the illuminance deficiency for the divided areas for which illuminance measurement results have been obtained, and calculate an increase in the output of the lighting device 20 required to compensate for the illuminance deficiency. The control device 10 may calculate the output of the lighting device 20 based on an illuminance table for the divided areas for which no illuminance measurement results have been obtained. The control device 10 may estimate the illuminance for the divided areas for which no illuminance measurement results have been obtained, based on the illuminance measurement results of the surrounding divided areas, calculate the illuminance deficiency from the estimated illuminance value, and calculate an increase in the output of the lighting device 20 required to compensate for the illuminance deficiency.

[0094] The control device 10 may execute a lighting control method including the steps of the flowchart illustrated in Fig. 10 in order to calculate the output of the lighting device 20 based on the illuminance measurement result and control the lighting device 20. The lighting control method may be realized as a lighting control program executed by a processor constituting the control device 10. The lighting control program may be stored in a non-transitory computer-readable medium.

[0095] The control device 10 sets a target illuminance for the human detection area (step S11). The procedure of step S11 may be the same as or similar to the procedure of step S1 in FIG. 9. The control device 10 determines whether to start optimizing the output of the lighting device 20 (step S12). The procedure of step S12 may be the same as or similar to the procedure of step S2 in FIG. 9. When the control device 10 does not determine to start optimizing the output of the lighting device 20 (step S12: NO), it repeats the determination procedure of step S12. The control device 10 may return to the setting procedure of step S11.

[0096] When the control device 10 determines to start optimizing the output of the lighting device 20 (step S12: YES), the control device 10 acquires a detection result of a human being in the lighting control area 100 from the detection device 30 (step S13). The procedure of step S13 may be the same as or similar to the procedure of step S3 in FIG.

[0097] The control device 10 acquires the measurement result of the illuminance of the illumination-controlled area 100 from the measurement device 50 (step S14). The control device 10 calculates the illuminance deficiency of each divided area based on the target illuminance of each divided area and the measurement result of the illuminance (step S15).

[0098] The control device 10 calculates and determines the output of each lighting device 20 in the lighting control area 100 (step S16). Specifically, the control device 10 may calculate an increase in the output of the lighting device 20 required to compensate for the illuminance deficiency calculated in the procedure of step S15. At least a part of the procedure of step S16 may be the same as or similar to at least a part of the procedure of step S5 in FIG. 9.

[0099] The control device 10 controls each lighting device 20 so that the output of each lighting device 20 becomes the calculated value (step S17). The procedure of step S17 may be the same as or similar to the procedure of step S6 in Fig. 9. After executing the procedure of step S17, the control device 10 ends the execution of the procedure of the flowchart in Fig. 10.

[0100] As described above, the lighting control system 1 may calculate the output of the lighting device 20 based on the illuminance measurement result to control the lighting device 20. When external light is incident on the lighting control area 100, the effect of the external light is reduced by calculating the output of the lighting device 20 based on the illuminance measurement result. In addition, the effect of illuminance errors due to factors not reflected in the illuminance table is reduced. As a result, the illuminance in the lighting control area 100 is controlled with high accuracy.

[0101] <Examples of conditions for starting optimization of the output of the lighting device 20> In the above-described embodiment, the control device 10 may recalculate the output of the lighting device 20 in response to an instruction to start optimizing the output of the lighting device 20. The control device 10 may optimize the output of the lighting device 20 by recalculating the output of the lighting device 20 when a condition for starting the optimization is satisfied.

[0102] <<Changes in the position of the human detection area>> For example, the control device 10 may periodically or irregularly obtain the human detection result from the detection device 30, and recalculate the output of the lighting device 20 when the position of the human detection area changes.

[0103] The control device 10 may execute a lighting control method including the steps of the flowchart illustrated in Fig. 11 in order to recalculate the output of the lighting device 20 in response to a change in the position of the human detection area and control the lighting device 20. The lighting control method may be realized as a lighting control program executed by a processor constituting the control device 10. The lighting control program may be stored in a non-transitory computer-readable medium.

[0104] The control device 10 sets a target illuminance for the human detection area (step S21). The procedure of step S21 may be the same as or similar to the procedure of step S1 in FIG. 9. The control device 10 acquires a human detection result in the lighting control area 100 from the detection device 30 (step S22). The procedure of step S22 may be the same as or similar to the procedure of step S3 in FIG. 9. The control device 10 identifies the human detection area based on the human detection result, and determines whether the position of the human detection area has changed (step S23). If the position of the human detection area has not changed (step S23: NO), the control device 10 returns to the procedure of acquiring the human detection result in step S22.

[0105] If the position of the human detection area has changed (step S23: YES), the control device 10 calculates and determines the output of each lighting device 20 in the lighting-controlled area 100 (step S24). The procedure of step S24 may be the same as or similar to the procedure of step S5 in Fig. 9. The control device 10 may obtain the measurement result of the illuminance of the lighting-controlled area 100 from the measurement device 50 to calculate the illuminance deficiency, and calculate the increase in output of the lighting device 20 required to compensate for the illuminance deficiency.

[0106] The control device 10 controls each lighting device 20 so that the output of each lighting device 20 becomes the calculated value (step S25). The procedure of step S25 may be the same as or similar to the procedure of step S6 in Fig. 9. After executing the procedure of step S25, the control device 10 ends the execution of the procedure of the flowchart in Fig. 11.

[0107] <<Changes in illuminance measurement results>> For example, the control device 10 may periodically or irregularly obtain measurement results of the illuminance of the lighting control area 100 from the measuring device 50, and may recalculate the output of the lighting device 20 when the measurement results of the illuminance of the lighting control area 100 or the human detection area change.

[0108] The control device 10 may execute a lighting control method including the steps of the flowchart illustrated in Fig. 12 in order to recalculate the output of the lighting device 20 in response to a change in the illuminance measurement result and control the lighting device 20. The lighting control method may be realized as a lighting control program executed by a processor constituting the control device 10. The lighting control program may be stored in a non-transitory computer-readable medium.

[0109] The control device 10 sets a target illuminance for the human detection area (step S31). The procedure of step S31 may be the same as or similar to the procedure of step S11 in FIG. 10. The control device 10 acquires a detection result of a human in the lighting control area 100 from the detection device 30 (step S32). The procedure of step S32 may be the same as or similar to the procedure of step S13 in FIG. 10. The control device 10 acquires a measurement result of the illuminance in the lighting control area 100 from the measurement device 50 (step S33). The procedure of step S33 may be the same as or similar to the procedure of step S14 in FIG. 10.

[0110] The control device 10 determines whether the measurement result of the illuminance in the lighting control area 100 or the human detection area has changed (step S34). If the measurement result of the illuminance has not changed (step S34: NO), the control device 10 returns to the procedure of acquiring the measurement result of the illuminance in step S3.

[0111] When the measurement result of the illuminance of the lighting control area 100 or the human detection area has changed (step S34: YES), the control device 10 calculates the illuminance deficiency of each divided area based on the target illuminance of each divided area and the measurement result of the illuminance (step S35). The procedure of step S35 may be the same as or similar to the procedure of step S15 in FIG.

[0112] The control device 10 calculates and determines the output of each lighting device 20 in the lighting control area 100 (step S36). The procedure of step S36 may be the same as or similar to the procedure of step S16 in FIG.

[0113] The control device 10 controls each lighting device 20 so that the output of each lighting device 20 becomes the calculated value (step S37). The procedure of step S37 may be the same as or similar to the procedure of step S17 in Fig. 10. After executing the procedure of step S37, the control device 10 ends the execution of the procedure of the flowchart in Fig. 12.

[0114] <When expressing the human detection area as the probability that a human exists> In the embodiment described above, the control device 10 identifies a divided area as either a human detection area or a non-human detection area, and calculates the output of the lighting device 20 corresponding to the human detection area. When the control device 10 obtains the probability that a human exists in a divided area, the control device 10 may calculate the output of the lighting device 20 corresponding to that divided area according to the probability that a human exists in that divided area. Hereinafter, as an example, it is assumed that the probability that a human exists in a divided area is expressed as a numerical range of 0 or more and 1 or less.

[0115] For example, the control device 10 may take into consideration the probability that a human being is present in the divided area in a term representing a reduction in the output of the target lighting device, which is included in the evaluation function used to calculate the output of the lighting device 20. Specifically, the evaluation function may include, as a term representing a reduction in the output of the target lighting device, the sum of the products of the output of the lighting device 20 and the probability that a human being is present in the divided area corresponding to the lighting device 20, instead of the sum of the outputs of the target lighting devices.

[0116] For example, the control device 10 may take into account the probability that a person exists in the divided area in a term expressing the uniformity of the output of the target lighting devices located within a predetermined range, which is included in the evaluation function used to calculate the output of the lighting device 20. In the term expressing the uniformity of the output of the target lighting devices located within a predetermined range, the probability that a person exists in the divided area may be taken into account in order to calculate the average value of the output of each target lighting device located within the predetermined range. Specifically, the average value of the output of each target lighting device located within the predetermined range may be calculated as the sum of the products of the outputs of the lighting devices 20 located within the predetermined range and the probability that a person exists in the divided area corresponding to the lighting devices 20, divided by the sum of the probability that a person exists in the divided area corresponding to the lighting devices 20 located within the predetermined range.

[0117] Specifying each divided area of ​​the lighting-controlled area 100 as either a human detection area or a human non-detection area based on the detection result of the position of a human in the lighting-controlled area 100 corresponds to generating a model that roughly approximates the position of a human in the lighting-controlled area 100. On the other hand, considering the probability that a human exists in the divided area can improve the accuracy of the model that represents the position of a human in the lighting-controlled area 100. Therefore, by considering the probability that a human exists in the divided area, the error of the evaluation function can be reduced compared to the case where the divided area is specified as either a human detection area or a human non-detection area. As a result, the calculation accuracy of the output of the lighting device 20 can be improved.

[0118] The drawings for explaining the embodiments according to the present disclosure are schematic, and the dimensional ratios and the like in the drawings do not necessarily correspond to the actual ones.

[0119] The contents of the present disclosure can be modified and altered in various ways by those skilled in the art based on the present disclosure. Therefore, these modifications and alterations are included in the scope of the present disclosure. For example, in each embodiment, each functional unit, each means, or each step can be added to other embodiments so as not to be logically inconsistent, or can be replaced with each functional unit, each means, or each step of other embodiments. In each embodiment, multiple functional units, each means, or each step can be combined into one or divided. In addition, each embodiment of the present disclosure described above is not limited to being implemented faithfully to each of the embodiments described above, and can be implemented by combining each feature or omitting a part as appropriate.

[0120] In this disclosure, descriptions such as "first" and "second" are identifiers for distinguishing the configuration. In the configurations distinguished by descriptions such as "first" and "second" in this disclosure, the numbers in the configurations can be exchanged. For example, the first coefficient can exchange the identifiers "first" and "second" with the second coefficient. The exchange of identifiers is performed simultaneously. The configurations remain distinguished even after the exchange of identifiers. The identifiers may be deleted. A configuration from which an identifier has been deleted is distinguished by a code. The descriptions of identifiers such as "first" and "second" in this disclosure should not be used solely to interpret the order of the configurations or to justify the existence of an identifier with a smaller number.

[0121] In one embodiment, (1) a lighting control method is a method executed by a control device that controls a plurality of lighting devices installed in a lighting control area. The lighting control method includes identifying a human detection area, which is an area in which at least one human is present, among a plurality of divided areas obtained by dividing the lighting control area. The lighting control method includes controlling the illuminance of the human detection area to be equal to or higher than a target illuminance, while reducing the output of one or more target lighting devices, which are lighting devices corresponding to the human detection area, below the output of surrounding lighting devices.

[0122] (2) The lighting control method described above in (1) may include minimizing a sum of a sum of an output of each of the plurality of lighting devices and a sum of an output of each of the one or more target lighting devices.

[0123] (3) The lighting control method described in (2) above may include minimizing a sum of a sum of the outputs of each of the plurality of lighting devices and a sum of values ​​obtained by multiplying the outputs of each of the one or more target lighting devices by a first coefficient.

[0124] (4) The lighting control method described in any one of (1) to (3) above may include minimizing the sum of absolute values ​​of the differences between an average output of one or more target lighting devices located within a predetermined range among the one or more target lighting devices and the output of each of the multiple lighting devices.

[0125] (5) The lighting control method described in any one of (1) to (4) above may include optimizing an output of each of the lighting devices in response to an instruction to optimize the output of the lighting devices.

[0126] (6) The lighting control method described in any one of (1) to (5) above may include optimizing an output of each of the lighting devices when a position of the human detection area changes.

[0127] (7) The lighting control method described in any one of (1) to (6) above may include optimizing the output of each of the lighting devices when the illuminance of the lighting control area or the human detection area changes.

[0128] (8) The lighting control method according to any one of (1) to (7) above may include optimizing the output of each of the lighting devices at predetermined time intervals.

[0129] (9) In the lighting control method according to any one of (1) to (8) above, the plurality of lighting devices may be glareless downlights.

[0130] In one embodiment, (10) a lighting control program is a lighting control program executed by a control device that controls a plurality of lighting devices installed in a lighting control area. The lighting control program causes the control device to identify a human detection area, which is an area in which at least one human is present, among a plurality of divided areas obtained by dividing the lighting control area. The lighting control program causes the control device to control the illuminance of the human detection area to be equal to or higher than a target illuminance, while causing the output of one or more target lighting devices, which are lighting devices corresponding to the human detection area, to be smaller than the output of surrounding lighting devices.

[0131] In one embodiment, (11) a lighting control system includes a plurality of lighting devices that illuminate a lighting control area, a control device that controls the plurality of lighting devices, and a detection device that identifies a human detection area that is an area in which at least one human is present among a plurality of divided areas obtained by dividing the lighting control area. The control device acquires information that identifies the human detection area from the detection device, and controls the illuminance of the human detection area to be equal to or higher than a target illuminance, while making the output of one or more target lighting devices that are lighting devices corresponding to the human detection area smaller than the output of surrounding lighting devices. [Explanation of symbols]

[0132] 1. Lighting control system 10 control device (12: calculation unit, 14: storage unit, 16: interface) 20 Lighting equipment (21-29: Light, 21L-29L: Lighting range) 30 Detection device (31: camera, 32: NFC tag, 33: beacon) 40 Setting terminal (41, 42: mobile terminal) 50 Measuring Equipment 70 Network (71: Wireless communication router) 80~86 Target 100 Lighting control area (101~103: divided area, 110: ceiling, 120: floor) 201~203 Area Group 300 Illuminance setting screen (310: Illuminance setting frame, 320: Function setting frame, 330: Setting button, 340: Optimization button)

Claims

1. A lighting control method executed by a control device that controls a plurality of lighting devices installed in a lighting control area, comprising: Identifying a human detection area, which is an area in which at least one human is present, among a plurality of divided areas obtained by dividing the lighting control area; While controlling the illuminance of the human detection area to be equal to or higher than a target illuminance, output of one or more target lighting devices which are lighting devices corresponding to the human detection area is made smaller than output of surrounding lighting devices. Lighting control methods.

2. The lighting control method according to claim 1 , further comprising minimizing a sum of outputs of the plurality of lighting devices and a sum of outputs of the one or more target lighting devices.

3. The lighting control method according to claim 2 , further comprising minimizing a sum of a sum of outputs of the plurality of lighting devices and a sum of values ​​obtained by multiplying the outputs of the one or more target lighting devices by a first coefficient.

4. 4. The lighting control method according to claim 1, further comprising minimizing a sum of absolute values ​​of differences between an average output of target lighting devices among the one or more target lighting devices that are located within a predetermined range and an output of each of the plurality of lighting devices.

5. The lighting control method according to claim 1 , further comprising optimizing an output of each of the lighting devices in response to an instruction to optimize the output of the lighting device.

6. The lighting control method according to claim 1 , further comprising optimizing an output of each of the lighting devices when a position of the human detection area changes.

7. The lighting control method according to claim 1 , further comprising optimizing an output of each of the lighting devices when an illuminance of the lighting control area or the human detection area changes.

8. 4. The lighting control method according to claim 1, further comprising optimizing the output of each of the lighting devices at predetermined time intervals.

9. The lighting control method according to claim 1 , wherein the plurality of lighting devices are glareless downlights.

10. A lighting control program to be executed by a control device that controls a plurality of lighting devices installed in a lighting control area, identifying a human detection area, which is an area in which at least one human is present, among a plurality of divided areas obtained by dividing the lighting control area; While controlling the illuminance of the human detection area to be equal to or higher than a target illuminance, output of one or more target lighting devices which are lighting devices corresponding to the human detection area is made smaller than output of surrounding lighting devices. Lighting control program.

11. a control device for controlling the plurality of lighting devices; and a detection device for identifying a human detection area, which is an area in which at least one human is present, among a plurality of divided areas obtained by dividing the lighting control area, The control device includes: acquiring information identifying the human detection area from the detection device; While controlling the illuminance of the human detection area to be equal to or higher than a target illuminance, output of one or more target lighting devices which are lighting devices corresponding to the human detection area is made smaller than output of surrounding lighting devices. Lighting control system.

Images