lighting system

Abstract

To provide an illumination system capable of improving the efficiency of work while looking at a display screen of electrical equipment.SOLUTION: An illumination system 10 includes a first light source 1A, a second light source 1B, a control unit 3, and an information detection unit 5. The first light source 1A irradiates a beam of first illumination light onto a first irradiation area of an irradiation surface. The second light source 1B irradiates a beam of the second illumination light onto a second irradiation area of the irradiation surface. The irradiation surface is located behind a piece of electrical equipment that has a display screen. The control unit 3 controls the first light source 1A and the second light source 1B. The information detection unit 5 detects biological pieces of information of a user of the electrical equipment. The first irradiation area is narrower than the second irradiation area. At least a part of the first irradiation area overlaps with the second irradiation area. The control unit 3 is configured so as to change the luminous power of the first illumination light in a period of change of the luminous power at a predetermined period based on the biological information of the user as the detection result of the information detection unit 5.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates generally to lighting systems, and more particularly to lighting systems comprising multiple light sources. [Background technology]

[0002] Patent Document 1 describes an illumination device (illumination system) having red light emitting means, blue light emitting means, and green light emitting means. The illumination device described in Patent Document 1 can promote awakening by, for example, increasing the ratio of the light emission amount of the blue light emitting means while keeping the total light emission amount of the three light emitting means approximately constant. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-102156 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, the number of times that people work while looking at the display screen of an electrical device has increased, and there is a demand for a work environment (lighting environment) that can improve the efficiency of such work.

[0005] An object of the present disclosure is to provide a lighting system that can improve the efficiency of work while viewing the display screen of an electrical device. [Means for solving the problem]

[0006] An illumination system according to one aspect of the present disclosure includes a first light source, a second light source, a control unit, and an information detection unit. The first light source irradiates a first illumination area on an illumination surface with first illumination light. The second light source irradiates a second illumination area on the illumination surface with second illumination light. The illumination surface is located behind an electrical device having a display screen. The control unit controls the first light source and the second light source. The information detection unit detects biometric information of a user of the electrical device. The first illumination area is smaller than the second illumination area. At least a portion of the first illumination area overlaps with the second illumination area. The control unit changes the light intensity of the first illumination light during a light intensity change period at a predetermined cycle based on the biometric information of the user detected by the information detection unit. [Effects of the Invention]

[0007] According to the lighting system according to one aspect of the present disclosure, it is possible to improve the efficiency of work while viewing the display screen of an electrical device. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a configuration diagram of a lighting system according to the first embodiment. [Figure 2] FIG. 2 is a schematic diagram of an installation state of the lighting system. [Figure 3] FIG. 3 is a schematic diagram of an application example of the above lighting system. [Figure 4] FIG. 4 is a schematic diagram of an illumination area formed on an illumination surface by the illumination system. [Figure 5] FIG. 5 is a chromaticity diagram for explaining the operation of the lighting system. [Figure 6] FIG. 6 is a graph showing the relationship between the time frequency and the amplitude gain in the above lighting system. [Figure 7] FIG. 7 is a graph showing a change in luminance over time when the luminance of the irradiation surface is changed in a first cycle in a first period in the lighting system of the above embodiment. [Figure 8]FIG. 8 is a graph showing a change in luminance over time when the luminance of the irradiation surface is changed in a second cycle in a first period in the lighting system of the same embodiment. [Figure 9] FIG. 9 is a graph showing a change in luminance over time when the luminance of the irradiation surface is changed in a third cycle in a first period in the lighting system of the same embodiment. [Figure 10] 10A is a graph showing a change over time in the light intensity of a first illumination light emitted from a first light source of an illumination system according to embodiment 2. FIG. 10B is a graph showing a change over time in the light intensity of a second illumination light emitted from a second light source of the illumination system according to embodiment 2. [Figure 11] 11A is a graph showing a change over time in the light intensity of a first illumination light emitted from a first light source of an illumination system according to Modification 1 of Embodiment 2. FIG. 11B is a graph showing a change over time in the light intensity of a second illumination light emitted from a second light source of the same illumination system. [Figure 12] 12A is a graph showing a change over time in the light intensity of a first illumination light emitted from a first light source of an illumination system according to Modification 2 of Embodiment 2. FIG. 12B is a graph showing a change over time in the light intensity of a second illumination light emitted from a second light source of the illumination system according to Modification 2 of Embodiment 2. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, lighting systems according to Embodiments 1 and 2 will be described with reference to the drawings. The drawings described in the following Embodiments 1 and 2 are schematic diagrams, and the ratios of the sizes and thicknesses of the components do not necessarily reflect the actual dimensional ratios. Furthermore, the configurations described in the following Embodiments 1 and 2 are merely examples of the present disclosure. The present disclosure is not limited to the following Embodiments 1 and 2, and various modifications are possible depending on the design, etc., as long as the effects of the present disclosure can be achieved.

[0010] (Embodiment 1) (1) Overview First, an overview of a lighting system 10 according to a first embodiment will be described with reference to FIGS.

[0011] As shown in FIG. 2, for example, the lighting system 10 according to the first embodiment is used to indirectly illuminate the electrical appliance 6 from behind when a user of the electrical appliance 6 (hereinafter referred to as "worker 300") performs work while looking at a display screen 61 (see FIG. 3) of the electrical appliance 6. The electrical appliance 6 is, for example, a notebook-sized personal computer. As shown in FIG. 3, the lighting system 10 according to the first embodiment indirectly illuminates the electrical appliance 6 located in front of the illumination surface S1 by irradiating an illumination surface S1 located behind the electrical appliance 6 with first illumination light 101 from a first light source 1A (see FIG. 1) and second illumination light 102 from a second light source 1B (see FIG. 1). In the lighting system 10 according to the first embodiment, the illumination surface S1 is, for example, the surface (front surface) of a partition 200 that forms a workspace WS1 (see FIG. 2).

[0012] The lighting system 10 according to the first embodiment aims to create a work environment (lighting environment) that allows the worker 300 to easily concentrate on the display screen 61 of the electrical appliance 6, in order to improve the efficiency of the work while looking at the display screen 61 of the electrical appliance 6. For this reason, the lighting system 10 according to the first embodiment employs the following configuration.

[0013] The lighting system 10 according to the first embodiment includes a first light source 1A, a second light source 1B, a controller 3, and an information detector 5. The first light source 1A emits first illumination light 101 onto a first illumination region R1 on an illumination surface S1. The second light source 1B emits second illumination light 102 onto a second illumination region R2 on the illumination surface S1. The illumination surface S1 is located behind an electrical appliance 6 having a display screen 61. The controller 3 controls the first light source 1A and the second light source 1B. The information detector 5 detects biometric information of a user (worker 300) of the electrical appliance 6. The first illumination region R1 is smaller than the second illumination region R2. At least a portion of the first illumination region R1 overlaps with the second illumination region R2. The controller 3 periodically changes the light intensity of the first illumination light 101 during a light intensity change period (e.g., the first period T1 in FIG. 7 ) based on the user's biometric information detected by the information detector 5.

[0014] In the lighting system 10 according to the first embodiment, a first illumination light 101 and a second illumination light 102 are irradiated onto an illumination surface S1 located behind an electrical appliance 6. A first illumination area R1 irradiated with the first illumination light 101 is narrower than a second illumination area R2 irradiated with the second illumination light 102, and at least a portion of the first illumination area R1 overlaps with the second illumination area R2. The control unit 3 periodically changes the light intensity of the first illumination light 101 during the light intensity change period based on the detection result of the information detection unit 5. This makes it possible to awaken the worker 300 compared to a case where the light intensity of the first illumination light 101 is not periodically changed. As a result, the worker 300 can more easily concentrate on the display screen 61 of the electrical appliance 6, thereby improving the efficiency of work using the electrical appliance 6.

[0015] Furthermore, in the lighting system 10 according to the first embodiment, at least a portion of the first illumination region R1 overlaps with the second illumination region R2, and the luminance difference gradient is gentler than when the first illumination region R1 does not overlap with the second illumination region R2, thereby making it possible to alleviate the discomfort felt by the worker 300.

[0016] (2) Details Next, the configuration of the lighting system 10 according to the first embodiment will be described with reference to FIGS.

[0017] As shown in FIG. 1, the lighting system 10 of embodiment 1 includes a first light source 1A, a second light source 1B, a first driving unit 2A, a second driving unit 2B, a control unit 3, an input receiving unit 4, and an information detection unit 5.

[0018] (2.1) First light source The first light source 1A includes a first light emitting section 111 and a first optical member 112, as shown in FIG.

[0019] The first light-emitting unit 111 has, for example, a plurality of light-emitting diodes (hereinafter referred to as "LEDs") of four different light colors (e.g., red, green, blue, and white). It is preferable that the plurality of LEDs of the same color are electrically connected in series and mounted on a substrate. In the following description, the plurality of LEDs of the same color mounted on a substrate may be referred to as an LED module.

[0020] The first optical member 112 is located in front of the first light-emitting unit 111. The first optical member 112 includes, for example, a diffusion sheet. The diffusion sheet is made of a translucent synthetic resin such as an acrylic resin or a polycarbonate resin. Therefore, the light emitted from the first light-emitting unit 111 is diffused and mixed by the diffusion sheet to become light (first illumination light 101) of a light color according to the ratio of the light intensity of each LED module. In other words, the first optical member 112 diffuses the light emitted from the first light-emitting unit 111 and emits it as the first illumination light 101. The first light source 1A may further include a lens unit. It is preferable that the lens unit include a plurality of lenses corresponding one-to-one to the plurality of LEDs included in each LED module.

[0021] As shown in FIG. 2, the first light source 1A further includes a housing 11A. The housing 11A is made of metal or synthetic resin. The housing 11A is formed in a box shape with one surface (the top surface in FIG. 2) open. The first light-emitting unit 111 is housed in the housing 11A with the LED facing toward the open surface. The first optical member 112 is attached to the housing 11A so as to cover the open surface.

[0022] The first light source 1A irradiates a first illumination light 101 onto a first illumination region R1 (see FIG. 4) on an illumination surface S1 located behind an electrical device 6 having a display screen 61. The first illumination region R1 will be described later.

[0023] (2.2)Second light source The second light source 1B includes a second light emitting section 121 and a second optical member 122, as shown in FIG.

[0024] Similar to the first light-emitting unit 111, the second light-emitting unit 121 has a plurality of LEDs of four different light colors (e.g., red, green, blue, and white). It is preferable that the plurality of LEDs of the same color are electrically connected in series and mounted on a substrate. In the following description, the plurality of LEDs of the same color mounted on a substrate may be referred to as an LED module.

[0025] The second optical member 122 is located in front of the second light-emitting unit 121. The second optical member 122 includes, for example, a linear Fresnel lens. The linear Fresnel lens is formed of a translucent synthetic resin such as an acrylic resin or a polycarbonate resin. Therefore, the light emitted from the second light-emitting unit 121 is collected and mixed by the linear Fresnel lens to become light (second illumination light 102) with a light color according to the ratio of the light intensity of each LED module. In other words, the second optical member 122 collects the light emitted from the second light-emitting unit 121 and emits it as the second illumination light 102.

[0026] As shown in FIG. 2, the second light source 1B further includes a housing 11B. The housing 11B is made of metal or synthetic resin. The housing 11B is formed in a box shape with one surface (the top surface in FIG. 2) open. The second light-emitting unit 121 is housed in the housing 11B with the LED facing toward the open surface. The second optical member 122 is attached to the housing 11B so as to cover the open surface.

[0027] The second light source 1B irradiates the second illumination light 102 onto a second irradiation area R2 (see FIG. 4) of the irradiation surface S1 located behind the electrical device 6 having the display screen 61. The second irradiation area R2 will be described later.

[0028] (2.3) First drive unit The first drive unit 2A includes, for example, a power conversion circuit that converts AC power supplied from a commercial power grid into DC power, and four constant current circuits that correspond one-to-one to the four LED modules of the first light-emitting unit 111.

[0029] The power conversion circuit includes, for example, a full-wave rectifier circuit, a boost chopper circuit, a smoothing capacitor, etc. The full-wave rectifier circuit is, for example, made up of a diode bridge. The power conversion circuit converts AC voltage input from the power grid (for example, AC voltage with a power supply frequency of 60 Hz and an effective value of 100 V) into DC voltage that is higher than the peak voltage of the AC voltage.

[0030] Each of the four constant current circuits includes, for example, a buck converter. The buck converter is, for example, a step-down chopper circuit. Each constant current circuit operates to step down the DC voltage output from the power conversion circuit using the buck converter and adjust the output current supplied to the corresponding LED module to match a target current value. For example, each constant current circuit may receive a digital signal conforming to the DMX (Digital Multiplex) 512 communication protocol from the control unit 3 and control the buck converter in accordance with this digital signal. Alternatively, each constant current circuit may perform PWM (Pulse Width Modulation) control of the buck converter in accordance with the light intensity target value and light color target value provided by the control unit 3.

[0031] The first driving unit 2A is electrically connected to the first light source 1A via, for example, four electric cables, which electrically connect the output terminals of the four constant current circuits of the first driving unit 2A to the input terminals of the four LED modules of the first light source 1A.

[0032] (2.4) Second drive unit Similar to the first drive unit 2A, the second drive unit 2B has a power conversion circuit that converts AC power supplied from a commercial power system into DC power, and four constant current circuits. The power conversion circuit and four constant current circuits of the second drive unit 2B have the same circuit configuration as the power conversion circuit and four constant current circuits of the first drive unit 2A, and therefore a description thereof will be omitted here.

[0033] The second driving unit 2B is electrically connected to the second light source 1B via, for example, four electric cables, which electrically connect the output terminals of the four constant current circuits of the second driving unit 2B to the input terminals of the four LED modules of the second light source 1B.

[0034] (2.5) Control Unit The control unit 3 is mainly composed of a computer system having one or more processors and one or more memories. In the lighting system 10, the one or more processors execute a program recorded in the memory, thereby realizing the functions of the control unit 3. The program may be pre-recorded in the memory, or may be provided via a telecommunications line such as the Internet, or may be recorded on a non-transitory recording medium such as a memory card and provided.

[0035] The control unit 3 controls the first light source 1A and the second light source 1B. More specifically, the control unit 3 controls the light intensity and light color of the first illumination light 101 emitted from the first light source 1A, and the light intensity and light color of the second illumination light 102 emitted from the second light source 1B. More specifically, the control unit 3 controls the light intensity and light color of the first illumination light 101 by providing a first light intensity target value and a first light color target value to the first drive unit 2A. Furthermore, the control unit 3 controls the light intensity and light color of the second illumination light 102 by providing a second light intensity target value and a second light color target value to the second drive unit 2B.

[0036] Here, the first illumination light 101 is converted from the first light intensity target value and the first light color target value into dimming values ​​for the four LED modules, and then converted into target current values ​​for the four constant current circuits. Therefore, the control unit 3 provides the target current values ​​for each constant current circuit to the first drive unit 2A as the first light intensity target value and the first light color target value.

[0037] The second illumination light 102 is converted from the second light intensity target value and the second light color target value into dimming values ​​for the four LED modules, and then converted into target current values ​​for the four constant current circuits. Therefore, the control unit 3 provides the target current values ​​for each constant current circuit to the second drive unit 2B as the second light intensity target value and the second light color target value.

[0038] However, when the constant current circuit is PWM controlled, the control unit 3 may convert the average value per unit time of the output current of the constant current circuit into the PWM control duty ratio required to match each target current value, and provide this duty ratio to the first drive unit 2A and the second drive unit 2B.

[0039] (2.6) Input reception section The input receiving unit 4 receives inputs specifying the first light intensity target value and the first light color target value described above. The input receiving unit 4 also receives inputs specifying the second light intensity target value and the second light color target value described above.

[0040] The input receiving unit 4 is configured, for example, by a computer system. The computer system may be, for example, a desktop or notebook personal computer, or a tablet terminal having an input device such as a touch panel mounted on a flat housing.

[0041] The input receiving unit 4, for example, displays a chromaticity diagram (e.g., an xy chromaticity diagram of the XYZ color system) on a monitor screen and receives an arbitrary chromaticity point selected with a mouse pointer, a touch pen, or a fingertip on the chromaticity diagram displayed on the monitor screen as an input specifying a light color target value. The input receiving unit 4 also displays a GUI (Graphical User Interface) such as a fader or slider on the monitor screen and receives an arbitrary numerical value selected by operating the GUI with a mouse pointer, a touch pen, or a fingertip as an input specifying a light intensity target value.

[0042] The input receiving unit 4 complies with a communication protocol such as DMX512 and is connected to the control unit 3 via a communication line so as to be able to communicate bidirectionally with the control unit 3. The input receiving unit 4 transmits the received input information (for example, x and y coordinates of a selected chromaticity point, numerical values ​​of a fader, etc.) to the control unit 3 via the communication line.

[0043] (2.7) Information detection unit The information detection unit 5 detects biometric information of a user (worker 300) of the electrical device 6 (see FIG. 3 ). The information detection unit 5 has, for example, a camera provided separately from the electrical device 6. The information detection unit 5 captures an image of a predetermined area including the face of the worker 300 with the camera, and outputs the captured image to the control unit 3.

[0044] The control unit 3 extracts a feature amount of the worker 300 from the captured image acquired from the information detection unit 5. The feature amount of the worker 300 is, for example, the size of the worker's eyes. Here, the size of the worker's eyes is, for example, the area or number of pixels of the region in which the worker's eyes are shown in the captured image. The control unit 3 determines that the worker 300 is drowsy if the size of the worker's eyes extracted from the captured image is equal to or smaller than a reference value, and determines that the worker 300 is awake if the size is larger than the reference value. If the control unit 3 determines that the worker 300 is drowsy, the control unit 3 executes a fluctuation operation described below. That is, the control unit 3 changes the light intensity of the first illumination light 101 during a light intensity change period (a first period T1 described below) at a predetermined cycle based on the user's biometric information detected by the information detection unit 5. In the first embodiment, the information detection unit 5 detects the face of the worker 300 as the biometric information of the worker 300.

[0045] (3) Installation status of lighting systems Next, the installation state of the lighting system 10 according to the first embodiment will be described with reference to FIGS. 2 and 3. Hereinafter, the direction in which the display screen 61 of the electrical device 6 and the illumination surface S1 are aligned will be referred to as the front-rear direction D1, the horizontal direction (the longitudinal direction of the display screen 61 in the example of FIG. 3) as the left-right direction D2, and the direction perpendicular to both the front-rear direction D1 and the left-right direction D2 (the short-side direction of the display screen 61 in the example of FIG. 3) as the up-down direction D3. However, these directions are not intended to limit the directions in which the lighting system 10 is used. Furthermore, the arrows indicating "D1," "D2," and "D3" in the drawings are merely shown for explanatory purposes and do not have any physical substance. Furthermore, in FIG. 3, the display screen 61, the first illumination region R1, and the second illumination region R2 of the electrical device 6 are colored to make them easily distinguishable. That is, the colors shown in FIG. 3 are not actually applied to the portions other than the display screen 61, the first illumination region R1, and the second illumination region R2. 3, the second irradiation region R2 is hatched with dots to make it easier to distinguish between the first irradiation region R1 and the second irradiation region R2. That is, the dot hatching shown in FIG. 3 does not indicate a cross section.

[0046] As shown in FIG. 2, the lighting system 10 is installed on an installation stand 7 provided below an irradiation surface S1. The irradiation surface S1 is, for example, the surface (front surface) of a partition 200 that forms the workspace WS1. A lighting fixture 8 for illuminating the workspace WS1 is attached to the ceiling surface of the workspace WS1. The lighting fixture 8 is, for example, a ceiling-mounted lighting fixture, but may also be a ceiling-embedded lighting fixture. The lighting fixture 8 irradiates the workspace WS1 with third illumination light 103, which has a light color different from the first illumination light 101 and the second illumination light 102.

[0047] The installation table 7 has a bottom plate 70, a front plate 71, a rear plate 72, and a pair of side plates 73. The bottom plate 70 is flat and disposed perpendicular to the irradiation surface S1. The front plate 71, like the bottom plate 70, is flat and protrudes upward from one end (front end) of the bottom plate 70 in the front-rear direction D1. The rear plate 72, like the bottom plate 70, is flat and protrudes upward from the other end (rear end) of the bottom plate 70 in the front-rear direction D1. The pair of side plates 73 protrude upward from both ends of the bottom plate 70 in the left-right direction D2 (direction perpendicular to the paper surface of FIG. 2). In other words, the installation table 7 is formed in the shape of a long box with an open top of the bottom plate 70. Note that FIG. 2 does not illustrate one of the pair of side plates 73 (the side on the near side of FIG. 2). The bottom plate 70, the front plate 71, the rear plate 72 and the pair of side plates 73 are preferably made of any one of metal, wood or synthetic resin plates.

[0048] The first light source 1A is installed in the internal space of the installation stand 7 (the space surrounded by the bottom plate 70, the front plate 71, the rear plate 72, and the pair of side plates 73). More specifically, the first light source 1A is fixed to the pair of side plates 73 in the internal space of the installation stand 7 such that the opening surface of the housing 11A (the emission surface of the first illumination light 101) faces upward. Furthermore, the first optical member 112 is displaced (rotated) with respect to the housing 11A so that the optical axis is directed toward the irradiation surface S1 so that the first illumination light 101 from the first light source 1A is irradiated toward the irradiation surface S1. That is, the first light source 1A is located between the installation surface S2 on which the electrical device 6 is placed and the irradiation surface S1 in the front-rear direction D1 in which the display screen 61 of the electrical device 6 and the irradiation surface S1 are aligned (see FIG. 2).

[0049] The second light source 1B is fixed to the pair of side plates 73 so that the opening surface of the housing 11B (the emission surface of the second illumination light 102) faces upward. The second light source 1B is installed at a position farther from the irradiation surface S1 than the first light source 1A in the internal space of the installation stand 7. That is, in the example of Fig. 2, the first light source 1A and the second light source 1B are arranged in the order of first light source 1A and second light source 1B from rear to rear along the front-rear direction D1.

[0050] As shown in FIG. 2, the opening surface of the housing 11A (the exit surface of the first illumination light 101) of the first light source 1A is located lower than the upper end of the front panel 71 in the vertical direction D3. As shown in FIG. 2, the opening surface of the housing 11B (the exit surface of the second illumination light 102) of the second light source 1B is located lower than the upper end of the front panel 71 in the vertical direction D3. Therefore, the forward-directed light of the first illumination light 101 from the first light source 1A and the second illumination light 102 from the second light source 1B is blocked by the front panel 71 of the installation stand 7 and is not directly visible to the worker 300 working with the electrical device 6 placed on the placement surface S2. As a result, it is possible to reduce glare due to the first illumination light 101 from the first light source 1A and the second illumination light 102 from the second light source 1B. Furthermore, in order to reduce glare and increase the incidence efficiency of light on the irradiation surface S1, it is preferable to tilt the exit surface 100 of the light source 1A toward the irradiation surface S1.

[0051] (4) Irradiation area of ​​the irradiated surface Next, the first irradiation region R1 and the second irradiation region R2 formed on the irradiation surface S1 will be described with reference to FIGS.

[0052] In the lighting system 10 according to the first embodiment, a first illumination region R1 is formed on the illumination surface S1 by irradiating the illumination surface S1 with a first illumination light 101 emitted from a first light source 1A. Furthermore, in the lighting system 10 according to the first embodiment, a second illumination region R2 is formed on the illumination surface S1 by irradiating the illumination surface S1 with a second illumination light 102 emitted from a second light source 1B. The term "first illumination region R1" used in the present disclosure refers to a region on the illumination surface S1 that is irradiated with the first illumination light 101 when only the first light source 1A of the first light source 1A and the second light source 1B is used, and that has a brightness of 30% or more of the maximum brightness. Furthermore, the term "second illumination region R2" used in the present disclosure refers to a region on the illumination surface S1 that is irradiated with the second illumination light 102 when only the second light source 1B of the first light source 1A and the second light source 1B is used, and that has a brightness of 30% or more of the maximum brightness. For example, in the left graph of the two graphs in Fig. 4, the range to the left of the first threshold value Th1 is the range where the luminance is 30% or more of the maximum luminance, and the upper and lower limit positions of the first illumination region R1 in the vertical direction D3 are determined from this graph. In the right graph of the two graphs in Fig. 4, the range to the left of the second threshold value Th2 is the range where the luminance is 30% or more of the maximum luminance, and the upper and lower limit positions of the second illumination region R2 in the vertical direction D3 are determined from this graph. When the electrical appliance 6 is placed on the placement surface S2, a portion (lower portion) of the display screen 61 of the electrical appliance 6 overlaps with the first illumination region R1 when the display screen 61 and the illumination surface S1 of the electrical appliance 6 are viewed from the front (see Fig. 4). Here, in order to provide an appropriate amount of stimulation to enhance wakefulness without interfering with visual tasks, it is preferable that, for example, at least 30% of the display screen 61 is included in the first illumination region R1.

[0053] 4, the first irradiation region R1 is narrower than the second irradiation region R2. More specifically, the length in the left-right direction D2 of the first irradiation region R1 is equal to the length in the left-right direction D2 of the second irradiation region R2, but the length in the up-down direction D3 of the first irradiation region R1 is shorter than the length in the up-down direction D3 of the second irradiation region R2.

[0054] Furthermore, at least a portion of the first illumination region R1 overlaps with the second illumination region R2. In the example of FIG. 4, the entire first illumination region R1 overlaps with the second illumination region R2. More specifically, the first illumination region R1 overlaps with the second illumination region R2 at a lower portion of the second illumination region R2. Therefore, in the lighting system 10 according to the first embodiment, point lighting by the first illumination light 101 is irradiated in addition to base lighting by the second illumination light 102. This makes it possible to increase the luminance difference discrimination threshold (the minimum value of the luminance difference between the first illumination light 101 and the second illumination light 102) compared to a case in which the second illumination light 102 is not irradiated to the second illumination region R2 of the illumination surface S1. As a result, it becomes possible to reduce the intervention stimulus caused by the fluctuating operation described below. In other words, the lighting system 10 according to the first embodiment makes it possible to alleviate the discomfort of the worker 300 caused by the fluctuating operation (intervention stimulus) described below. In this case, in order to further increase the luminance difference discrimination threshold, it is preferable that the luminance in the lower part of the second irradiation region R2 (for example, the part overlapping with the first irradiation region R1) is the highest. Also, in order to enhance the wakefulness effect of the fluctuating action described below, it is preferable that the saturation of the first illumination light 101 is higher than that of the second illumination light 102. Furthermore, it is preferable that the area of ​​the first irradiation region R1 is ⅓ or less of the area of ​​the second irradiation region R2.

[0055] 3, when the display screen 61 and the irradiation surface S1 of the electrical device 6 are viewed from the front, the length L1 in the left-right direction D2 of the first irradiation region R1 formed on the irradiation surface S1 by the first illumination light 101 from the first light source 1A is preferably at least twice the length L2 in the left-right direction D2 of the display screen 61 of the electrical device 6. As an example, when the length L2 in the left-right direction D2 of the display screen 61 of the electrical device 6 is 265 mm, the length L1 in the left-right direction D2 of the first irradiation region R1 is preferably at least 693 mm. As a result, the first irradiation region R1 is formed so as to include a stable field of gaze of the worker 300 performing work using the electrical device 6. In the present disclosure, the "stable field of gaze" refers to a range in which information can be received comfortably, and includes not only the effective field of view in which information can be received by eye movement but also a range in which information can be received comfortably through head movement (hereinafter referred to as the "information receptive range"). For example, the information receptive range is 45 degrees or less in the left and right directions relative to the front, 30 degrees or less in the upward direction relative to the front, and 40 degrees or less in the downward direction relative to the front. As an example, if the information receptive range is 30 degrees to the right and 30 degrees to the left relative to the front, the stable gaze field of the worker 300 is included in the length L1 of the above-mentioned irradiation area R1 in the left and right direction D2.

[0056] Furthermore, the average brightness of the display screen 61 of the electrical device 6 is generally 100 cd / m , regardless of the size of the display screen 61. 2 Above, 350cd / m 2 Therefore, the average luminance of the first irradiation region R1 on the irradiation surface S1 is set to 100 cd / m 2 or less so that the average luminance of the first irradiation region R1 approaches the average luminance of the display screen 61 of the electrical device 6. 2 That's 350cd / m 2 It is preferable to control it as follows.

[0057] (5) Color range of the first and second illumination lights Next, the light color ranges of the first illumination light 101 and the second illumination light 102 will be described with reference to Fig. 5. Fig. 5 is an xy chromaticity diagram of the CIE1931 color space.

[0058] In the workspace WS1 (see FIG. 2) described above, light with relatively high saturation is not preferred, and light with relatively low saturation is preferred. Therefore, the light color range of the first illumination light 101 and the second illumination light 102 is preferably within an inner region R3 of an ellipse E1, as shown in FIG. 5. The ellipse E1 is defined by an elliptical formula with center coordinates (x, y) = (0.3333, 0.3333), a semimajor axis of 0.1796, a semiminor axis of 0.1227, and an inclination of the major axis A1 relative to the x-axis (the angle θ1 between the x-axis and the major axis A1) of 40.984 degrees. That is, the control unit 3 preferably controls the first light source 1A and the second light source 1B so that the chromaticities of the first illumination light 101 and the second illumination light 102 are within the chromaticity of the inner region R3 of the ellipse E1 defined by the above elliptical formula in the xy chromaticity diagram of the CIE 1931 color space.

[0059] More preferably, the light color ranges of the first illumination light 101 and the second illumination light 102 are within an inner region R4 of an ellipse E2, as shown in Fig. 5. The ellipse E2 is defined by an elliptical formula with center coordinates (x, y) = (0.3333, 0.3333), a semi-major axis of 0.1409, a semi-minor axis of 0.0722, and an inclination of the major axis A1 relative to the x-axis (the angle θ1 between the x-axis and the major axis A1) of 40.984 degrees.

[0060] Here, "P0" in FIG. 5 is the center point of the ellipses E1 and E2. Furthermore, "P11" and "P12" in FIG. 5 are chromaticity points corresponding to the chromaticity of the first illumination light 101 in the fluctuating operation described below. More specifically, "P11" in FIG. 5 is the chromaticity point (first chromaticity point) of the first chromaticity corresponding to the maximum luminance of the first illumination region R1 by the first illumination light 101 in the first period T1 (see FIG. 7). Furthermore, "P12" in FIG. 5 is the chromaticity point (second chromaticity point) of the second chromaticity corresponding to the minimum luminance of the first illumination region R1 by the first illumination light 101 in the first period T1. The first period T1 is a period during which the fluctuating operation described below is performed, and corresponds to a light intensity change period. In the example of FIG. 5, the first chromaticity point P11 and the second chromaticity point P12 are included in the inner region R4 of the ellipse E2. The second chromaticity at the second chromaticity point P12 is also the chromaticity of the first illumination region R1 by the first illumination light 101 during a second period T2 (see FIG. 7) during which a fluctuating operation, which will be described later, is not being performed.

[0061] 5, the saturation decreases toward the center point P0 of the ellipses E1 and E2. Therefore, the saturation of the first chromaticity point P11, which is located farther from the center point P0 of the ellipses E1 and E2, is higher than the saturation of the second chromaticity point P12, which is located closer to the center point P0. In this way, in the fluctuating operation described below, by irradiating the irradiation surface S1 with the first illumination light 101 of the first chromaticity, which has high saturation, it is possible to awaken the consciousness of the operator 300 who sees the first illumination light 101 irradiated onto the irradiation surface S1. In addition, in the lighting system 10 according to the first embodiment, as shown in FIG. 4, the entire first illumination region R1 overlaps with the second illumination region R2, and the first illumination light 101 and the second illumination light 102 are mixed in the first illumination region R1. This makes it possible to lower the excitation purity of the first illumination light 101 compared to when only the first illumination light 101 is irradiated onto the first illumination region R1, and as a result, it is possible to make the change in light color caused by the first illumination light 101 more gradual, thereby making it possible to alleviate discomfort caused by strong stimulation.

[0062] (6) Fluctuating motion Next, the fluctuation operation that is executed when the control unit 3 determines that the worker 300 is feeling drowsy will be described with reference to Figures 6 to 9. The "fluctuation operation" in the present disclosure refers to an operation that changes the light intensity of the first illumination light 101 irradiated from the first light source 1A toward the irradiation surface S1 (see Figure 3) at a predetermined cycle during a light intensity change period (for example, a first period T1).

[0063] The horizontal axis in FIG. 6 represents the time frequency of the first illumination light 101 during the first period T1, and the vertical axis in FIG. 6 represents the amplitude gain of the first illumination light 101. The solid line a1 in FIG. 6 represents the upper limit of the amplitude gain at each time frequency, and the dotted line a2 in FIG. 6 represents the lower limit of the amplitude gain at each time frequency. Here, the amplitude gain is defined as the ratio of the luminance that is half the range of change when the light intensity of the first illumination light 101 is changed to the average luminance of the surface S1 illuminated by the first illumination light 101 during the fluctuating operation. The first period T1 is a period during which the light intensity of the first illumination light 101 is changed at a predetermined cycle, and corresponds to the light intensity change period.

[0064] If the amplitude gain is too small, i.e., if the change in the light intensity of the first illumination light 101 is too small, the change in luminance of the first illumination region R1 on the illumination surface S1 will also be small, and the worker 300 may not notice the change in luminance of the first illumination region R1. On the other hand, if the amplitude gain is too large, i.e., if the change in the light intensity of the first illumination light 101 is too large, the change in luminance of the first illumination region R1 on the illumination surface S1 will be large, and the worker 300 may feel uncomfortable. Therefore, considering human breathing, the temporal frequency is preferably 0.06 Hz or more because deep breathing occurs 4 to 6 times per minute, and 1.0 Hz or less, which has a certain degree of amplitude tolerance as shown in FIG. 6. More preferably, since normal breathing occurs 10 to 24 times per minute, the temporal frequency is preferably 0.16 Hz or more and 0.4 Hz or less.

[0065] Fig. 7 is a graph showing the change in luminance of the first illumination region R1 when the temporal frequency is 0.1 Hz. The horizontal axis of Fig. 7 represents time, and the vertical axis of Fig. 7 represents the luminance of the first illumination region R1. Furthermore, T1 in Fig. 7 represents the first period, and T2 in Fig. 7 represents the second period. Here, the second period T2 is a period during which the light intensity of the first illumination light 101 is constant. That is, during the second period T2, as shown in Fig. 7, the light intensity of the first illumination light 101 is constant, for example, 93 cd / m 2 7, the first period T1 is 30 seconds. That is, in the example of FIG. 7, the light intensity of the first illumination light 101 is changed for 30 seconds at a temporal frequency of 0.1 Hz. Therefore, in the example of FIG. 7, three cycles of fluctuation are applied in the first period T1.

[0066] In the example of FIG. 7, during the second period T2 in which the fluctuating operation is not performed, the average luminance of the first irradiation region R1 is 93 cd / m 2 In the example of FIG. 7, during the first period T1 in which the fluctuating operation is being performed, the maximum luminance of the first irradiation region R1 is 207 cd / m 2 and the minimum brightness is 93 cd / m 2 Therefore, the average luminance of the first irradiation region R1 in the first period T1 is 150 cd / m 2That is, the average luminance of the first illumination region R1 by the first illumination light 101 in the first period T1 is higher than the average luminance of the first illumination region R1 by the first illumination light 101 in the second period T2 in which the light intensity of the first illumination light 101 is constant.

[0067] The change in luminance during the first period T1 is defined as a percentage of half the difference between the maximum and minimum luminance of the first illumination region R1 during the first period T1 due to the first illumination light 101, relative to the average luminance of the first illumination region R1 during the first period T1 due to the first illumination light 101. In the example of Fig. 7, the change in luminance during the first period T1 is {(207-93) / 2} / 150×100=38%.

[0068] Fig. 8 is a graph showing the change in luminance of the first irradiation region R1 when the temporal frequency is 0.5 Hz. The horizontal axis of Fig. 8 indicates time, and the vertical axis of Fig. 8 indicates the luminance of the first irradiation region R1. Furthermore, T1 in Fig. 8 indicates a first period, and T2 in Fig. 8 indicates a second period. Here, the second period T2 is a period during which the light intensity of the first illumination light 101 is constant. That is, during the second period T2, as shown in Fig. 8, the light intensity of the first illumination light 101 is constant, for example, 131 cd / m 2 8, the first period T1 is 6 seconds. That is, in the example of FIG. 8, the light intensity of the first illumination light 101 is changed for 6 seconds at a temporal frequency of 0.5 Hz. Therefore, in the example of FIG. 8, three cycles of fluctuation are applied in the first period T1.

[0069] In the example of FIG. 8, during the second period T2 in which the fluctuation operation is not performed, the average luminance of the first irradiation region R1 is 131 cd / m 2 In the example of FIG. 8, during the first period T1 in which the fluctuating operation is being performed, the maximum luminance of the first irradiation region R1 is 168 cd / m 2 and the minimum brightness is 132 cd / m 2 Therefore, the average luminance of the first irradiation region R1 in the first period T1 is 150 cd / m 2That is, the average luminance of the first illumination region R1 by the first illumination light 101 in the first period T1 is higher than the average luminance of the first illumination region R1 by the first illumination light 101 in the second period T2 in which the light intensity of the first illumination light 101 is constant.

[0070] The change in luminance during the first period T1 is defined as a percentage of half the difference between the maximum and minimum luminance of the first illumination region R1 during the first period T1 due to the first illumination light 101, relative to the average luminance of the first illumination region R1 during the first period T1 due to the first illumination light 101. In the example of Fig. 8, the change in luminance during the first period T1 is {(168-132) / 2} / 150×100=12%.

[0071] 9 is a graph showing the change in luminance of the first illumination region R1 when the temporal frequency is 1.0 Hz. The horizontal axis of FIG. 9 represents time, and the vertical axis of FIG. 9 represents the luminance of the first illumination region R1. Furthermore, T1 in FIG. 9 represents the first period, and T2 in FIG. 9 represents the second period. Here, the second period T2 is a period during which the light intensity of the first illumination light 101 is constant. That is, during the second period T2, as shown in FIG. 9, the light intensity of the first illumination light 101 is constant, for example, 142 cd / m 2 9, the first period T1 is 3 seconds. That is, in the example of FIG. 9, the light intensity of the first illumination light 101 is changed for 3 seconds at a temporal frequency of 1.0 Hz. Therefore, in the example of FIG. 9, three cycles of fluctuation are applied in the first period T1.

[0072] In the example of FIG. 9, during the second period T2 in which the fluctuation operation is not performed, the average luminance of the first irradiation region R1 is 142 cd / m 2 In the example of FIG. 9, during the first period T1 in which the fluctuating operation is being performed, the maximum luminance of the first irradiation region R1 is 158 cd / m 2 and the minimum brightness is 142 cd / m 2 Therefore, the average luminance of the first irradiation region R1 in the first period T1 is 150 cd / m 2That is, the average luminance of the first illumination region R1 by the first illumination light 101 in the first period T1 is higher than the average luminance of the first illumination region R1 by the first illumination light 101 in the second period T2 in which the light intensity of the first illumination light 101 is constant.

[0073] The change in luminance during the first period T1 is defined as a percentage of half the difference between the maximum and minimum luminance of the first illumination region R1 during the first period T1 due to the first illumination light 101, relative to the average luminance of the first illumination region R1 during the first period T1 due to the first illumination light 101. In the example of Fig. 9, the change in luminance during the first period T1 is {(158-142) / 2} / 150×100=5%.

[0074] As described above, in the lighting system 10 according to the first embodiment, the control unit 3 changes the light intensity of the first illumination light 101 in a first period (light intensity change period) T1 at a predetermined cycle based on the biological information of the user (worker 300) of the electrical device 6, which is the detection result of the information detection unit 5. The percentage of the luminance of half the difference between the maximum and minimum luminance of the first illumination region R1 by the first illumination light 101 in the first period T1 relative to the average luminance of the first illumination region R1 by the first illumination light 101 in the first period T1 is 5% or more and 38% or less. In addition, in the first embodiment, three cycles of fluctuation (light intensity change) are imparted in the first period T1. However, the fluctuation is not limited to three cycles, and one, two, four, or five cycles may be imparted in the first period T1. That is, it is sufficient that the light intensity change is imparted in the first period T1 by one cycle or more and five cycles or less.

[0075] (7) Comparison with comparative examples As a comparative example, a system for controlling the lighting of a viewing space where a viewer is viewing an image displayed on a display screen of an electrical device is presented. The system controls one or more light sources provided in the viewing space so that at least one parameter of the light intensity, light color, light distribution, and direction of the lighting in the viewing space matches the corresponding parameter of a virtual image space created from the image displayed on the display screen. This enhances the sense of realism of the image displayed on the display screen.

[0076] In contrast, as described above, the lighting system 10 of embodiment 1 aims to create a work environment (lighting environment) that makes it easier for the worker 300 to concentrate on the display screen 61 of the electrical device 6 in order to improve the efficiency of work while looking at the display screen 61 of the electrical device 6, and has a different purpose from the system of the comparative example described above.

[0077] (8) Effects In the lighting system 10 according to the first embodiment, a first illumination light 101 and a second illumination light 102 are irradiated onto an illumination surface S1 located behind an electrical appliance 6. A first illumination area R1 irradiated with the first illumination light 101 is narrower than a second illumination area R2 irradiated with the second illumination light 102, and at least a portion of the first illumination area R1 overlaps with the second illumination area R2. The control unit 3 periodically changes the light intensity of the first illumination light 101 during the light intensity change period based on the detection result of the information detection unit 5. This makes it possible to awaken the worker 300 compared to a case where the light intensity of the first illumination light 101 is not periodically changed. As a result, the worker 300 can more easily concentrate on the display screen 61 of the electrical appliance 6, thereby improving the efficiency of work using the electrical appliance 6.

[0078] Furthermore, in the lighting system 10 according to the first embodiment, at least a portion of the first irradiation area R1 overlaps with the second irradiation area R2, which makes it possible to reduce the discomfort felt by the worker 300 compared to when the first irradiation area R1 does not overlap with the second irradiation area R2.

[0079] Furthermore, in the lighting system 10 according to the first embodiment, the saturation of the first lighting light 101 is higher than the saturation of the second lighting light 102. This makes it possible to more arouse the consciousness of the worker 300 compared to when the saturations of the first lighting light 101 and the second lighting light 102 are equal.

[0080] In the lighting system 10 according to the first embodiment, the predetermined period is equal to or greater than 0.06 Hz and equal to or less than 1.0 Hz, which reduces the possibility that the worker 300 feels uncomfortable compared to when the predetermined period is greater than 1.0 Hz.

[0081] Furthermore, in the lighting system 10 according to the first embodiment, the percentage of the luminance of half the difference between the maximum luminance and the minimum luminance of the first illumination region R1 by the first illumination light 101 in the first period T1 relative to the average luminance of the first illumination region R1 by the first illumination light 101 in the first period T1 is not less than 5% and not more than 38%. This makes it possible to wake up the worker 300 without making him / her feel uncomfortable.

[0082] (9) Variations The first embodiment is merely one of various embodiments of the present disclosure. Various modifications of the first embodiment are possible depending on the design, etc., as long as the object of the present disclosure can be achieved. Modifications of the first embodiment are listed below. The modifications described below can be applied in appropriate combinations.

[0083] The lighting system 10 of the present disclosure includes a computer system. The computer system is primarily composed of a processor and memory as hardware. The functions of the lighting system 10 of the present disclosure are realized by the processor executing a program stored in the memory of the computer system. The program may be pre-stored in the memory of the computer system, provided via a telecommunications line, or provided in a non-transitory recording medium readable by the computer system, such as a memory card, optical disk, or hard disk drive. The processor of the computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large-scale integrated circuit (LSI). The integrated circuits, such as ICs and LSIs, are referred to by different names depending on the degree of integration, and include integrated circuits called system LSIs, very large-scale integrations (VLSIs), or ultra-large-scale integrations (ULSIs). Furthermore, field-programmable gate arrays (FPGAs), which are programmable after the LSI is manufactured, or logic devices that allow the reconfiguration of internal connections or internal circuit partitions of the LSI, can also be used as processors. The electronic circuits may be integrated into one chip or distributed across multiple chips. The chips may be integrated into one device or distributed across multiple devices. The computer system referred to here includes a microcontroller having one or more processors and one or more memories. Therefore, the microcontroller is also composed of one or more electronic circuits including a semiconductor integrated circuit or a large-scale integrated circuit.

[0084] Furthermore, it is not essential for the lighting system 10 that multiple functions are concentrated in one housing, and the components of the lighting system 10 may be distributed across multiple housings. Furthermore, at least some of the functions of the lighting system 10, for example, some of the functions of the control unit 3, may be realized by the cloud (cloud computing) or the like.

[0085] Conversely, in the first embodiment, at least some of the functions of the lighting system 10 that are distributed among multiple devices may be integrated into one housing. For example, some of the functions of the lighting system 10 that are distributed between the first driving unit 2A and the control unit 3 may be integrated into one housing.

[0086] In the first embodiment, the electrical device 6 is a notebook personal computer. However, the electrical device 6 is not limited to a notebook personal computer, and may be, for example, a desktop personal computer, a tablet terminal, or a smartphone. Furthermore, the electrical device 6 may be, for example, a television.

[0087] In the first embodiment, the first light source 1A and the second light source 1B are partition lights arranged between the electrical device 6 and the irradiation surface S1 in the front-rear direction D1. In contrast, at least one of the first light source 1A and the second light source 1B is not limited to partition lights, and may be, for example, a light provided on the back surface of the electrical device 6 (the surface opposite to the surface on which the display screen 61 is provided), a desk stand, or a base light attached to the ceiling surface.

[0088] In the first embodiment, each of the first light source 1A and the second light source 1B has four types of LEDs. However, at least one of the first light source 1A and the second light source 1B may further have an LED other than the four types of LEDs (for example, a highly saturated blue LED) in addition to the four types of LEDs.

[0089] In the first embodiment, the first optical member 112 of the first light source 1A includes a linear Fresnel lens. However, the first optical member 112 may include a plurality of lenses corresponding one-to-one to the plurality of LEDs of each type, instead of the linear Fresnel lens. The first optical member 112 may further include a diffusion sheet.

[0090] In the first embodiment, the input receiving unit 4 receives input specifying the target light intensity value and the target light color value from a chromaticity diagram and a GUI displayed on a monitor screen. Alternatively, the input receiving unit 4 may receive input specifying the target light intensity value and the target light color value from a physical keyboard or a CUI (Character-based User Interface) such as a virtual keyboard displayed on a monitor screen.

[0091] In the first embodiment, the camera included in the information detection unit 5 is a camera separate from the electric device 6, but the camera included in the information detection unit 5 may be a camera mounted on the electric device 6.

[0092] In the first embodiment, the information detection unit 5 has a camera, but the information detection unit 5 may also have, for example, an electroencephalograph that detects brain waves (biological information) of the worker 300. In this case, the control unit 3 determines that the worker 300 is relaxed if the brain waves of the worker 300 detected by the electroencephalograph include alpha waves, and determines that the worker 300 is in a tense state if they do not. Then, the control unit 3 performs the above-mentioned fluctuation operation when the worker 300 is in a tense state.

[0093] The information detection unit 5 may also have a pulse sensor that detects the pulse wave (biological information) of the worker 300. In this case, the control unit 3 determines that the worker 300 is relaxed if the pulse wave of the worker 300 detected by the pulse wave sensor is below a threshold, and determines that the worker 300 is in a tense state if the pulse wave is above the threshold. Then, the control unit 3 executes the fluctuation action described above when the worker 300 is in a tense state.

[0094] Furthermore, the feature amount of the worker 300 extracted by the information detection unit 5 is not limited to the size of the eyes of the worker 300, but may be, for example, the ratio of the size of the eyes to the entire face of the worker 300.

[0095] 7 to 9, there is one first period T1, but the number of first periods T1 is not limited to one, and for example, multiple first periods T1 may be provided in a predetermined period. In other words, the fluctuation operation may be performed multiple times in a predetermined period.

[0096] In the first embodiment, the illumination surface S1 is not included in the lighting system 10, but the illumination surface S1 may be included in the lighting system 10. That is, the lighting system 10 may further include a member (partition 200) having the illumination surface S1. This makes it possible to provide a lighting system 10 that is integrally provided with the illumination surface S1.

[0097] (Embodiment 2) An illumination system 10 according to the second embodiment will be described with reference to Fig. 10 to Fig. 12. Constituent elements of the illumination system 10 according to the second embodiment that are the same as those of the illumination system 10 according to the first embodiment will be denoted by the same reference numerals and will not be described again.

[0098] The lighting system 10 according to the second embodiment differs from the lighting system 10 according to the first embodiment in that it performs a fluctuating operation using the second illumination light 102 in addition to a fluctuating operation using the first illumination light 101.

[0099] In the lighting system 10 according to the second embodiment, the control unit 3 changes the light intensity of the first illumination light 101 in a first period T11. In addition, in the lighting system 10 according to the second embodiment, the control unit 3 changes the light intensity of the second illumination light 102 in a second period T21. That is, in the lighting system 10 according to the second embodiment, in addition to the fluctuating operation using the first illumination light 101, a fluctuating operation using the second illumination light 102 is also performed. As shown in FIGS. 10A and 10B , the second period T21 is a period different from the first period T11, which is a light intensity changing period.

[0100] In the lighting system 10 according to the second embodiment, as shown in FIG. 10A, the first period T11 is a period from time t12 to time t13, a period from time t14 to time t15, or a period from time t16 to time t17. In addition, in the lighting system 10 according to the second embodiment, as shown in FIG. 10B, the second period T21 is a period from time t11 to time t18. That is, in the lighting system 10 according to the second embodiment, the fluctuation operation using the first illumination light 101 is performed three times while the fluctuation operation using the second illumination light 102 is being performed. In addition, in the lighting system 10 according to the second embodiment, the fluctuation operation using the first illumination light 101 is started at times t12, t14, and t16, when the light intensity of the second illumination light 102 is different. In addition, in the lighting system 10 according to the second embodiment, as shown in FIG. 10B, the light intensity of the second illumination light 102 changes so as to decrease over time. As described above, in the lighting system 10 according to the second embodiment, the length of the second period T21 is longer than the length of the first period T11. The second period T21 is, for example, 24 hours. The first period T11 is, for example, 30 seconds. That is, in the lighting system 10 according to the second embodiment, the second illumination light 102 fluctuates according to a circadian rhythm having the second period T21 as one cycle.

[0101] (2) Effects Also in the lighting system 10 according to the second embodiment, by periodically changing the light intensity of the first illumination light 101 in the first period (light intensity change period) T11 based on the detection result of the information detection unit 5, it is possible to awaken the consciousness of the worker 300 compared to when the light intensity of the first illumination light 101 is not periodically changed. As a result, it becomes easier for the worker 300 to concentrate on the display screen 61 of the electrical appliance 6, and it is possible to improve the efficiency of work using the electrical appliance 6.

[0102] Furthermore, in the lighting system 10 according to the second embodiment, at least a portion of the first irradiation area R1 overlaps with the second irradiation area R2, which makes it possible to reduce the discomfort felt by the worker 300 compared to when the first irradiation area R1 does not overlap with the second irradiation area R2.

[0103] Furthermore, in the illumination system 10 according to the second embodiment, the length of the second period T21 during which the light intensity of the second illumination light 102 is changed is longer than the length of the first period T11 during which the light intensity of the first illumination light 101 is changed. This makes it possible to adjust the brightness of the illumination surface S1 while making it difficult to notice a change in the luminance of the illumination surface S1 due to the second illumination light 102.

[0104] (3) Variations Below, we will list some modified examples of embodiment 2. The modified examples explained below can be applied in appropriate combinations.

[0105] (3.1) Variation 1 The lighting system 10 according to Modification 1 differs from the lighting system 10 according to Embodiment 2 in that the light intensity of the second illumination light 102 is changed (increased) in accordance with the decrease in the eye sensitivity of the worker 300. The lighting system 10 according to Modification 1 will be described below with reference to Figs. 11A and 11B.

[0106] 11A, in the lighting system 10 according to the first modification, the periods from time t22 to time t23, the period from time t24 to time t25, and the period from time t26 to time t27 are the first periods T12. That is, the control unit 3 performs the fluctuating operation using the first illumination light 101 during each of the first periods T12. More specifically, the control unit 3 starts the fluctuating operation using the first illumination light 101 at times t22, t24, and t26 when the light intensity of the second illumination light 102 is different.

[0107] 11B, in the lighting system 10 according to the first modification, the control unit 3 performs a fluctuating operation using the second illumination light 102 during a second period T22 from time t21 to time t28. More specifically, during the second period T22, the control unit 3 increases the intensity of the second illumination light 102 in accordance with the decrease in the eye sensitivity of the operator 300 over time. That is, in the lighting system 10 according to the first modification, the control unit 3 also changes the intensity of the second illumination light 102 during the second period T22, which is different from the first period T12 serving as a light intensity change period. In the lighting system 10 according to the first modification, the length of the second period T22 is also longer than the length of the first period T12. The second period T22 is, for example, one hour. The first period T12 is, for example, 30 seconds.

[0108] In the lighting system 10 according to the first modification, the control unit 3 changes (increases) the light intensity of the second illumination light 102 in accordance with the decrease in the eye sensitivity of the worker 300 over time. This increases the contrast with the first illumination light 101, making it easier for the worker 300 to see the display screen 61 of the electrical device 6, thereby improving work efficiency.

[0109] (3.2) Variation 2 The lighting system 10 according to Modification 2 differs from the lighting system 10 according to Embodiment 2 in that the second illumination light 102 fluctuates in an ultradian rhythm, with the second period T23 being one cycle. The lighting system 10 according to Modification 2 will be described below with reference to FIGS. 12A and 12B.

[0110] 12A, in the lighting system 10 according to the second modification, the periods from time t32 to time t33, the period from time t34 to time t35, and the period from time t36 to time t37 are the first period T13. That is, the control unit 3 performs the fluctuating operation using the first illumination light 101 during each of the first periods T13. More specifically, the control unit 3 starts the fluctuating operation using the first illumination light 101 at the timings of time t32, time t34, and time t36 when the light intensity of the second illumination light 102 is different.

[0111] In the lighting system 10 according to Modification 2, as shown in FIG. 12B , the control unit 3 performs a fluctuating operation using the second illumination light 102 during a second period T23 from time t31 to time t38. More specifically, during the second period T23, the control unit 3 first increases the light intensity of the second illumination light 102, then decreases it, and then increases it again. That is, in the lighting system 10 according to Modification 2, the control unit 3 also changes the light intensity of the second illumination light 102 during the second period T23, which is different from the first period T13 serving as the light intensity change period. Also in the lighting system 10 according to Modification 2, the length of the second period T23 is longer than the length of the first period T13. The second period T23 is, for example, approximately 30 minutes to 4 hours. The first period T13 is, for example, 30 seconds. That is, in the lighting system 10 according to Modification 2, the fluctuating operation using the second illumination light 102 is performed in an ultradian rhythm, with the second period T23 being one cycle.

[0112] (3.3) Other Modifications Other variations are listed below.

[0113] In the second embodiment and the first and second modifications, the lengths of the second periods T21, T22, and T23 are longer than the lengths of the first periods T11, T12, and T13. In contrast, the lengths of the second periods may be the same as the lengths of the first periods. In this case, depending on the timing at which the light intensity of the first illumination light 101 and the light intensity of the second illumination light 102 are changed, it is possible to increase the amount of change in the first illumination light 101 relative to the second illumination light 102.

[0114] Furthermore, the configuration (including modifications) described in the second embodiment can be applied in appropriate combination with the configuration (including modifications) described in the first embodiment.

[0115] (Aspect) The present specification discloses the following aspects.

[0116] The lighting system (10) according to the first aspect includes a first light source (1A), a second light source (1B), a control unit (3), and an information detection unit (5). The first light source (1A) irradiates a first irradiation region (R1) of an irradiation surface (S1) with a first illumination light (101). The second light source (1B) irradiates a second irradiation region (R2) of the irradiation surface (S1) with a second illumination light (102). The irradiation surface (S1) is located behind an electrical device (6) having a display screen (61). The control unit (3) controls the first light source (1A) and the second light source (1B). The information detection unit (5) detects biometric information of a user of the electrical device (6). The first irradiation region (R1) is narrower than the second irradiation region (R2). At least a portion of the first irradiation region (R1) overlaps with the second irradiation region (R2). The control unit (3) changes the light intensity of the first illumination light (101) in the light intensity change period (T1) at a predetermined cycle based on the biological information of the user, which is the detection result of the information detection unit (5).

[0117] According to this embodiment, it is possible to improve the efficiency of work using the electrical equipment (6).

[0118] In the illumination system (10) according to the second aspect, in the first aspect, the saturation of the first illumination light (101) is higher than the saturation of the second illumination light (102).

[0119] According to this embodiment, it is possible to further awaken the consciousness of the worker (300) compared to when the saturation of the first illumination light (101) and the saturation of the second illumination light (102) are equal.

[0120] In the lighting system (10) according to the third aspect, in the first or second aspect, the predetermined cycle is equal to or greater than 0.06 Hz and equal to or less than 1.0 Hz.

[0121] According to this embodiment, it is possible to reduce the possibility that the worker (300) feels uncomfortable.

[0122] In the illumination system (10) according to the fourth aspect, in any one of the first to third aspects, the percentage of the brightness of half the difference between the maximum brightness and the minimum brightness of the first illumination region (R1) by the first illumination light (101) during the light intensity change period (T1) relative to the average brightness of the first illumination region (R1) by the first illumination light (101) during the light intensity change period (T1) is 5% or more and 38% or less.

[0123] According to this embodiment, it is possible to awaken the consciousness of the worker (300) without making the worker (300) uncomfortable.

[0124] In the lighting system (10) according to a fifth aspect, in any one of the first to fourth aspects, the control unit (3) changes the light intensity of the second illumination light (102) in a second period (T21, T22, T23). The second period (T21, T22, T23) is a period different from the first period (T11, T12, T13) as the light intensity change period (T11, T12, T13).

[0125] According to this aspect, it is possible to reduce the range of change of the first illumination light (101) relative to the second illumination light (102), thereby further reducing the discomfort felt by the worker (300).

[0126] In a lighting system (10) according to a sixth aspect, in the fifth aspect, the length of the second period (T21, T22, T23) is longer than the length of the first period (T11, T12, T13).

[0127] According to this aspect, it is possible to adjust the brightness (luminance) of the illuminated surface (S1) while making it difficult to notice a change in luminance of the illuminated surface (S1) caused by the second illumination light (102).

[0128] In a lighting system (10) according to a seventh aspect, in the fifth aspect, the length of the second period (T21, T22, T23) is the same as the length of the first period (T11, T12, T13).

[0129] According to this aspect, it is possible to increase the amount of change in the first illumination light (101) relative to the second illumination light (102).

[0130] In the lighting system (10) according to the eighth aspect, in any one of the first to seventh aspects, the second illumination region (R2) has the highest luminance in the lower part of the second illumination region (R2).

[0131] According to this embodiment, the brightness in the line of sight of the worker (300) can be increased, and the visibility of the display screen (61) of the electrical device (6) is improved.

[0132] The lighting system (10) according to a ninth aspect is any one of the first to eighth aspects, and further comprises a member (200) having an irradiation surface (S1).

[0133] According to this aspect, it is possible to provide a lighting system (10) that is integrally provided with the illumination surface (S1).

[0134] In an illumination system (10) according to a tenth aspect, in any one of the first to ninth aspects, the first light source (1A) has a first light-emitting section (111) and a first optical member (112). The first optical member (112) is located in front of the first light-emitting section (111) and collects light emitted from the first light-emitting section (111) to emit the light as the first illumination light (101). The second light source (1B) has a second light-emitting section (121) and a second optical member (122). The second optical member (122) is located in front of the second light-emitting section (121) and diffuses light emitted from the second light-emitting section (121) to emit the light as the second illumination light (102).

[0135] According to this aspect, it is possible to form the first irradiation region (R1) in a desired range on the irradiation surface (S1), while forming the second irradiation region (R2) in a wide range.

[0136] The configurations according to the second to tenth aspects are not essential for the lighting system (10) and can be omitted as appropriate. [Explanation of symbols]

[0137] 1A 1st light source 1B 2nd light source 3. Control Unit 5 Information detection unit 6. Electrical Equipment 61 Display screen 10. Lighting System 101 First illumination light 102 Second illumination light 111 First light-emitting part 112 first optical member 121 Second light-emitting part 122 second optical member 200 Partition (component) 300 workers (users) R1 1st irradiation area R2 2nd irradiation area S1 irradiation surface T1, T11, T12, T13 First period (light intensity change period) T21, T22, T23 2nd period

Claims

1. a first light source that irradiates a first illumination area of ​​an illumination surface located behind the electrical device having a display screen with first illumination light; a second light source that irradiates a second illumination area of ​​the illumination surface with second illumination light; a control unit that controls the first light source and the second light source; an information detection unit that detects biometric information of a user of the electrical device, The first illumination area is narrower than the second illumination area, At least a portion of the first illumination area overlaps with the second illumination area, the control unit changes the light intensity of the first illumination light during a light intensity change period at a predetermined cycle based on the biological information of the user that is a detection result of the information detection unit. Lighting system.

2. The saturation of the first illumination light is higher than the saturation of the second illumination light.

10. The lighting system of claim 1.

3. The predetermined period is equal to or greater than 0.06 Hz and equal to or less than 1.0 Hz.

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

4. a percentage of a luminance of half the difference between the maximum luminance and the minimum luminance of the first illumination area by the first illumination light during the light amount change period relative to an average luminance of the first illumination area by the first illumination light during the light amount change period is 5% or more and 38% or less.

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

5. the control unit changes the light amount of the second illumination light in a second period different from the first period as the light amount change period; 3. A lighting system according to claim 1 or 2.

6. The length of the second period is longer than the length of the first period.

6. The lighting system of claim 5.

7. The length of the second period is the same as the length of the first period.

6. The lighting system of claim 5.

8. In the second illumination region, the brightness is highest in a lower part of the second illumination region.

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

9. Further comprising a member having the irradiation surface, 3. A lighting system according to claim 1 or 2.

10. The first light source is A first light-emitting unit; a first optical member located in front of the first light-emitting unit and diffusing light emitted from the first light-emitting unit to emit the light as the first illumination light; The second light source is A second light-emitting unit; a second optical member located in front of the second light-emitting unit and configured to condense light emitted from the second light-emitting unit and emit the condensed light as the second illumination light; 3. A lighting system according to claim 1 or 2.

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