JP7796366B2 - lighting system - Google Patents

Description

This disclosure relates generally to lighting systems, and more particularly to lighting systems having multiple light sources.

Patent Document 1 describes a lighting device (lighting system) having red, blue, and green light-emitting means. The lighting device described in Patent Document 1 can promote wakefulness 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.

Japanese Patent Application Laid-Open No. 2019-102156

In recent years, there has been an increasing trend of people working while looking at the display screens of electrical devices, and there is a demand for a work environment (lighting environment) that improves the efficiency of such work.

The purpose of this disclosure is to provide a lighting system that can improve work efficiency while viewing the display screen of electrical equipment.

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 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 interval, based on the biometric information of the user detected by the information detection unit.

The lighting system according to one aspect of the present disclosure makes it possible to improve work efficiency while viewing the display screen of an electrical device.

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

The lighting systems according to Embodiments 1 and 2 will be described below with reference to the drawings. The figures 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.

(Embodiment 1)
(1) Overview First, an overview of a lighting system 10 according to a first embodiment will be described with reference to FIGS. 1 to 3. FIG.

2, 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 the display screen 61 (see FIG. 3) of the electrical appliance 6. The electrical appliance 6 is, for example, a notebook 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 irradiation surface S1 by irradiating the irradiation surface S1 located behind the electrical appliance 6 with first illumination light 101 from the first light source 1A (see FIG. 1) and second illumination light 102 from the second light source 1B (see FIG. 1). In the lighting system 10 according to the first embodiment, the irradiation surface S1 is, for example, the surface (front surface) of a partition 200 that forms the workspace WS1 (see FIG. 2).

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 device 6, in order to improve the efficiency of work while looking at the display screen 61 of the electrical device 6. For this reason, the lighting system 10 according to the first embodiment employs the following configuration.

The lighting system 10 according to the first embodiment 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 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 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 (worker 300) of the electrical device 6. The first illumination region R1 is narrower than the second illumination region R2. At least a portion of the first illumination region R1 overlaps with the second illumination region R2. The control unit 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 detection unit 5.

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 irradiation surface S1 located behind an electrical device 6. The first illumination region R1 irradiated with the first illumination light 101 is narrower than the second illumination region R2 irradiated with the second illumination light 102, and at least partially overlaps with the second illumination region R2. The control unit 3 then periodically changes the light intensity of the first illumination light 101 during the light intensity change period based on the detection results of the information detection unit 5. This makes it possible to awaken the worker 300 compared to when 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 device 6, thereby improving the efficiency of work using the electrical device 6.

Furthermore, in the lighting system 10 according to embodiment 1, at least a portion of the first illumination region R1 overlaps with the second illumination region R2, which results in a gentler luminance difference gradient than when the first illumination region R1 does not overlap with the second illumination region R2, thereby making it possible to alleviate discomfort felt by the worker 300.

(2) Details Next, the configuration of the lighting system 10 according to the first embodiment will be described with reference to FIGS. 1 and 2. FIG.

As shown in FIG. 1, the lighting system 10 according to the first embodiment 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.

(2.1) First Light Source The first light source 1A includes a first light emitting portion 111 and a first optical member 112, as shown in FIG.

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

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 acrylic resin or 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 corresponding 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 multiple lenses that correspond one-to-one to the multiple LEDs included in each LED module.

As shown in Figure 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 side (the top side in Figure 2) open. The first light-emitting unit 111 is housed in the housing 11A with the LED facing toward the open side. The first optical member 112 is attached to the housing 11A so as to cover the open side.

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

(2.2) Second Light Source The second light source 1B includes a second light emitting portion 121 and a second optical member 122, as shown in FIG.

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

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 from a translucent synthetic resin such as acrylic resin or 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 that corresponds 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 second illumination light 102.

As shown in Figure 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 side (the top side in Figure 2) open. The second light-emitting unit 121 is housed in the housing 11B with the LED facing toward the open side. The second optical member 122 is attached to the housing 11B so as to cover the open side.

The second light source 1B emits the second illumination light 102 onto a second irradiation area R2 (see Figure 4) on the irradiation surface S1 located behind the electrical device 6 having the display screen 61. The second irradiation area R2 will be described later.

(2.3) First Driving Unit The first driving 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. The four constant current circuits correspond one-to-one to the four LED modules of the first light-emitting unit 111.

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, composed of a diode bridge. The power conversion circuit converts the AC voltage input from the power grid (for example, an AC voltage with a power supply frequency of 60 Hz and an effective value of 100 V) into a DC voltage higher than the peak voltage of the AC voltage.

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 uses the buck converter to step down the DC voltage output from the power conversion circuit and operates to match the output current supplied to the corresponding LED module with 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.

The first drive unit 2A is electrically connected to the first light source 1A via, for example, four electrical cables. The four electrical cables electrically connect the output terminals of the four constant current circuits of the first drive unit 2A to the input terminals of the four LED modules of the first light source 1A.

(2.4) Second Drive Unit The second drive unit 2B, like the first drive unit 2A, 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.

The second drive unit 2B is electrically connected to the second light source 1B via, for example, four electrical cables. The four electrical cables electrically connect the output terminals of the four constant current circuits of the second drive unit 2B to the input terminals of the four LED modules of the second light source 1B.

(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, may be provided via a telecommunications line such as the Internet, or may be provided by being recorded on a non-transitory recording medium such as a memory card.

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.

Here, the first illumination light 101 is converted from the first light intensity target value and 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 first light color target value.

Furthermore, the second illumination light 102 is converted from the second light intensity target value and 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 second light color target value.

However, if 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.

(2.6) Input Receiving Unit The input receiving unit 4 receives input specifying the first light intensity target value and the first light color target value described above. The input receiving unit 4 also receives input specifying the second light intensity target value and the second light color target value described above.

The input reception 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 equipped with an input device such as a touch panel on a flat housing.

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

The input reception unit 4 conforms to a communication protocol such as DMX512 and is connected to the control unit 3 via a communication line for bidirectional communication. The input reception unit 4 transmits the received input information (e.g., x and y coordinates of the selected chromaticity point, numerical values of faders, etc.) to the control unit 3 via the communication line.

(2.7) Information Detection Unit The information detection unit 5 detects biometric information of the 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, for example, 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.

The control unit 3 extracts a feature of the worker 300 from the captured image acquired from the information detection unit 5. The feature of the worker 300 is, for example, the size of the worker's 300 eyes. Here, the size of the worker's 300 eyes refers to, for example, the area or number of pixels of the region in the captured image in which the worker's 300 eyes are shown. The control unit 3 then determines that the worker 300 is drowsy if the size of the worker's 300 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, it executes the fluctuation operation described below. That is, the control unit 3 changes the light intensity of the first illumination light 101 during the light intensity change period (the first period T1 described below) at a predetermined interval based on the user's biometric information, which is the detection result of the information detection unit 5. In embodiment 1, the information detection unit 5 detects the face of the worker 300 as the biometric information of the worker 300.

(3) Installation Status of the Lighting System Next, the installation status 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 form. 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 easily distinguish them. 3 are not actually applied to areas other than the display screen 61, the first irradiation region R1, and the second irradiation region R2. In addition, in FIG. 3, dot hatching is applied to the second irradiation region R2 to make it easier to distinguish between the first irradiation region R1 and the second irradiation region R2. In other words, the dot hatching shown in FIG. 3 does not indicate a cross section.

As shown in FIG. 2, the lighting system 10 is installed on a mounting stand 7 provided below the 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 lighting light 103, which has a light color different from the first lighting light 101 and the second lighting light 102.

The installation stand 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-to-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-to-rear direction D1. The pair of side plates 73 protrude upward from both ends of the bottom plate 70 in the left-to-right direction D2 (the direction perpendicular to the paper surface of FIG. 2). In other words, the installation stand 7 is formed in the shape of a long box with an open top on the bottom plate 70. Note that one of the pair of side plates 73 (the side on the near side of FIG. 2) is not shown in FIG. 2. The bottom plate 70, front plate 71, rear plate 72, and pair of side plates 73 are preferably made from metal, wood, or synthetic resin.

The first light source 1A is installed in the internal space of the installation stand 7 (the space surrounded by the bottom plate 70, front plate 71, rear plate 72, and 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 so 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) relative to the housing 11A so that the optical axis is directed toward the illumination surface S1 so that the first illumination light 101 from the first light source 1A is irradiated toward the illumination 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 illumination surface S1 in the front-to-rear direction D1 in which the display screen 61 of the electrical device 6 and the illumination surface S1 are aligned (see FIG. 2).

The second light source 1B is fixed to a 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 also installed in the internal space of the installation stand 7 at a position farther from the irradiation surface S1 than the first light source 1A. 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, second light source 1B from rear to rear along the front-rear direction D1.

In the first light source 1A, the opening surface of the housing 11A (the exit surface of the first illumination light 101) is located below the upper end of the front plate 71 in the vertical direction D3, as shown in FIG. 2. In the second light source 1B, the opening surface of the housing 11B (the exit surface of the second illumination light 102) is located below the upper end of the front plate 71 in the vertical direction D3, as shown in FIG. 2. 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 plate 71 of the installation stand 7 and is not directly visible to the worker 300 working with the electrical equipment 6 placed on the mounting surface S2. As a result, it is possible to reduce glare caused by 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 suppress glare and increase the efficiency of incidence on the irradiation surface S1, it is preferable to tilt the exit surface 100 of the light source 1 toward the irradiation surface S1.

(4) Irradiation Area of Irradiation Surface Next, the first irradiation area R1 and the second irradiation area R2 formed on the irradiation surface S1 will be described with reference to FIGS. 3 and 4. FIG.

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 first illumination light 101 emitted from the first light source 1A. 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 second illumination light 102 emitted from the second light source 1B. In this disclosure, the term "first illumination region R1" 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 luminance of 30% or more of the maximum luminance. In this disclosure, the term "second illumination region R2" 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 luminance of 30% or more of the maximum luminance. For example, in the left graph of the two graphs in FIG. 4 , the range to the left of the first threshold Th1 is the range where the luminance is 30% or more of the maximum luminance, and the upper and lower limits of the first irradiation region R1 in the vertical direction D3 are determined from this graph. Also, in the right graph of the two graphs in FIG. 4 , the range to the left of the second threshold Th2 is the range where the luminance is 30% or more of the maximum luminance, and the upper and lower limits of the second irradiation region R2 in the vertical direction D3 are determined from this graph. Furthermore, when the electrical device 6 is placed on the placement surface S2, a portion (lower portion) of the display screen 61 of the electrical device 6 overlaps with the first irradiation region R1 when the display screen 61 and the irradiation surface S1 of the electrical device 6 are viewed from the front (see FIG. 4 ). Here, to provide an appropriate amount of stimulation to enhance alertness without interfering with visual tasks, it is preferable that, for example, at least 30% of the display screen 61 is included in the first irradiation region R1.

In the example of FIG. 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.

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 the bottom of the second illumination region R2. Therefore, in the lighting system 10 according to embodiment 1, point illumination using the first illumination light 101 is applied in addition to base illumination using 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 when the second illumination light 102 is not applied to the second illumination region R2 on the illumination surface S1, thereby reducing the intervention stimulus caused by the fluctuating operation described below. In other words, the lighting system 10 according to embodiment 1 makes it possible to alleviate the discomfort felt by the worker 300 by the fluctuating operation (intervention stimulus) described below. In this case, to further increase the luminance difference discrimination threshold, it is preferable that the luminance be highest in the lower part of the second irradiation region R2 (for example, the part overlapping with the first irradiation region R1). Furthermore, to enhance the awakening effect of the fluctuating action described below, it is preferable that the saturation of the first illumination light 101 be higher than the saturation of the second illumination light 102. Furthermore, it is preferable that the area of the first irradiation region R1 be ⅓ or less of the area of the second irradiation region R2.

Here, as shown in FIG. 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, if 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. This allows the first irradiation region R1 to be formed so as to include the stable field of view of the worker 300 performing work using the electrical device 6. In this disclosure, the "stable field of view" refers to the 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 the range in which information can be received comfortably through head movement (hereinafter referred to as the "information receptive range"). For example, the information acceptability range in the horizontal direction is 45 degrees or less to the left and right of the front, 30 degrees or less above the front, and 40 degrees or less below the front. As an example, if the information acceptability range is 30 degrees to the right and 30 degrees to the left of the front, the stable field of view of the worker 300 is included in the length L1 of the above-mentioned irradiation area R1 in the left-right direction D2.

Furthermore, the average luminance of the display screen 61 of the electrical device 6 is generally set to 100 cd/ ^m2 or more and 350 cd/m2 or less, regardless of the size of the display screen 61. For this reason, it is preferable to control the average luminance of the first irradiation region R1 to 100 cd/ ^m2 or more and 350 cd/ ^m2 or less so that the average luminance of the first irradiation region R1 of the irradiation surface S1 approaches the average luminance of the display screen 61 of the electrical device ⁶ .

(5) Light Color Range of First Illumination Light and Second Illumination Light Next, the light color range 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 CIE 1931 color space.

In the workspace WS1 described above (see FIG. 2), 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 the inner region R3 of the 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. In other words, the control unit 3 preferably controls the first light source 1A and the second light source 1B so that the chromaticity of the first illumination light 101 and the second illumination light 102 falls 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.

More preferably, the light color ranges of the first illumination light 101 and the second illumination light 102 are within the inner region R4 of the ellipse E2, as shown in Figure 5. The ellipse E2 is defined by an elliptical formula with center coordinates (x, y) = (0.3333, 0.3333), a semimajor axis of 0.1409, a semiminor 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.

Here, "P0" in FIG. 5 is the center point of the ellipses E1 and E2. Also, "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). Also, "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 the period during which the fluctuating operation described below is performed, and corresponds to the 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 the second period T2 (see FIG. 7) during which the fluctuating operation described below is not being performed.

In the example of FIG. 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 highly saturated first chromaticity, it is possible to awaken the consciousness of the worker 300 who sees the first illumination light 101 irradiated onto the irradiation surface S1. In the lighting system 10 according to embodiment 1, 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, which in turn makes it possible to make the change in light color caused by the first illumination light 101 more gradual and alleviate discomfort caused by strong stimulation.

(6) Fluctuation Operation 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).

The horizontal axis in Figure 6 represents the time frequency of the first illumination light 101 during the first period T1, and the vertical axis in Figure 6 represents the amplitude gain of the first illumination light 101. Furthermore, the solid line a1 in Figure 6 is a broken line representing the upper limit of the amplitude gain at each time frequency, and the dotted line a2 in Figure 6 is a broken line representing the lower limit of the amplitude gain at each time frequency. Here, the amplitude gain is defined as the ratio of the brightness that is half the range of change when the light intensity of the first illumination light 101 is changed to the average brightness of the surface S1 illuminated by the first illumination light 101 during fluctuating operation. Furthermore, 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.

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 brightness 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 brightness 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 brightness of the first illumination region R1 on the illumination surface S1 will be large, and the worker 300 may feel uncomfortable. For this reason, considering human breathing, the temporal frequency is preferably 0.06 Hz or higher, since deep breathing occurs 4 to 6 times per minute, and 1.0 Hz or lower, which has a certain degree of amplitude tolerance as shown in Figure 6. More preferably, since normal breathing occurs 10 to 24 times per minute, the temporal frequency is preferably 0.16 Hz or higher and 0.4 Hz or lower.

FIG. 7 is a graph showing the change in luminance of the first irradiation 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 irradiation region R1. Also, 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, e.g., 93 cd/ ^m2 . Also, in the example of FIG. 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 imparted during the first period T1.

7 , the average luminance of the first irradiation region R1 is 93 cd/ ^m² during the second period T2 when the fluctuating operation is not being performed. Also, in the example of FIG. 7 , the maximum luminance of the first irradiation region R1 is 207 cd/ ^m² and the minimum luminance is 93 cd/ ^m² during the first period T1 when the fluctuating operation is being performed. Therefore, the average luminance of the first irradiation region R1 during the first period T1 is 150 cd/ ^m² . That is, the average luminance of the first irradiation region R1 by the first illumination light 101 during the first period T1 is higher than the average luminance of the first irradiation region R1 by the first illumination light 101 during the second period T2 when the light amount of the first illumination light 101 is constant.

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 illuminated region R1 illuminated by the first illumination light 101 during the first period T1, relative to the average luminance of the first illuminated region R1 illuminated by the first illumination light 101 during the first period T1. In the example of Figure 7, the change in luminance during the first period T1 is {(207-93)/2}/150 x 100 = 38%.

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 represents time, and the vertical axis of FIG. 8 represents the luminance of the first irradiation region R1. Furthermore, T1 in FIG. 8 represents the first period, and T2 in FIG. 8 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. 8, the light intensity of the first illumination light 101 is constant, e.g., 131 cd/ ^m2 . Furthermore, in the example of FIG. 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 imparted during the first period T1.

In the example of Fig. 8 , during the second period T2 in which the fluctuating operation is not performed, the average luminance of the first irradiation region R1 is 131 cd/ ^m² . Also, in the example of Fig. 8 , during the first period T1 in which the fluctuating operation is performed, the maximum luminance of the first irradiation region R1 is 168 cd/ ^m² and the minimum luminance is 132 cd/ ^m² . Therefore, the average luminance of the first irradiation region R1 during the first period T1 is 150 cd/ ^m² . In other words, the average luminance of the first irradiation region R1 by the first illumination light 101 during the first period T1 is higher than the average luminance of the first irradiation region R1 by the first illumination light 101 during the second period T2 in which the light amount of the first illumination light 101 is constant.

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 illuminated region R1 illuminated by the first illumination light 101 during the first period T1, relative to the average luminance of the first illuminated region R1 illuminated by the first illumination light 101 during the first period T1. In the example of Figure 8, the change in luminance during the first period T1 is {(168-132)/2}/150 x 100 = 12%.

FIG. 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, e.g., 142 cd/ ^m2 . Furthermore, in the example of FIG. 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 imparted during the first period T1.

9 , in the second period T2 in which the fluctuating operation is not performed, the average luminance of the first irradiation region R1 is 142 cd/ ^m² . Also in the example of FIG. 9 , in the first period T1 in which the fluctuating operation is performed, the maximum luminance of the first irradiation region R1 is 158 cd/ ^m² and the minimum luminance is 142 cd/ ^m² . Therefore, the average luminance of the first irradiation region R1 in the first period T1 is 150 cd/ ^m² . That is, the average luminance of the first irradiation region R1 by the first illumination light 101 in the first period T1 is higher than the average luminance of the first irradiation region R1 by the first illumination light 101 in the second period T2 in which the light amount of the first illumination light 101 is constant.

The change in luminance during the first period T1 is defined as a percentage of the average luminance of the first illuminated region R1 illuminated by the first illumination light 101 during the first period T1, which is half the difference between the maximum and minimum luminance of the first illuminated region R1 illuminated by the first illumination light 101 during the first period T1. In the example of Figure 9, the change in luminance during the first period T1 is {(158-142)/2}/150 x 100 = 5%.

As described above, in the lighting system 10 according to the first embodiment, the control unit 3 periodically changes the light intensity of the first illumination light 101 during the first period (light intensity change period) T1 based on the biometric information of the user (worker 300) of the electrical device 6, which is the result of detection by 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 during the first period T1 due to the first illumination light 101 during the first period T1 relative to the average luminance of the first illumination region R1 during the first period T1 is 5% or more and 38% or less. Furthermore, in the first embodiment, three cycles of fluctuation (light intensity change) are imparted during the first period T1. However, this is not limited to three cycles of fluctuation. One, two, four, or five cycles of fluctuation may also be imparted during the first period T1. That is, the system may be configured to impart one or more cycles and five or fewer cycles of fluctuation during the first period T1.

(7) Comparison with Comparative Example As a comparative example, a system for controlling the lighting of an appreciation space in which an observer is viewing an image displayed on a display screen of an electrical device is presented. The system according to the comparative example controls one or more light sources provided in the appreciation space so that at least one parameter of the light intensity, light color, light distribution, and direction of the lighting in the appreciation 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.

In contrast, as described above, the lighting system 10 according to 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 work efficiency while looking at the display screen 61 of the electrical device 6. This has a different purpose from the system according to the comparative example described above.

(8) Effects In the lighting system 10 according to the first embodiment, the first illumination light 101 and the second illumination light 102 are irradiated onto an illumination surface S1 located behind the electrical device 6. The first illumination region R1 irradiated with the first illumination light 101 is narrower than the second illumination region R2 irradiated with the second illumination light 102 and at least partially overlaps with the second illumination region R2. The control unit 3 then 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 when 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 device 6, thereby improving the efficiency of work using the electrical device 6.

Furthermore, in the lighting system 10 according to embodiment 1, at least a portion of the first irradiation region R1 overlaps with the second irradiation region R2, which makes it possible to reduce the discomfort felt by the worker 300 compared to when the first irradiation region R1 does not overlap with the second irradiation region R2.

Furthermore, in the lighting system 10 according to embodiment 1, the saturation of the first illumination light 101 is higher than the saturation of the second illumination light 102. This makes it possible to more arouse 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.

Furthermore, in the lighting system 10 according to embodiment 1, the predetermined period is equal to or greater than 0.06 Hz and equal to or less than 1.0 Hz. This reduces the likelihood that the worker 300 will feel uncomfortable compared to when the predetermined period is greater than 1.0 Hz.

Furthermore, in the lighting system 10 according to embodiment 1, the percentage of the brightness of half the difference between the maximum brightness and minimum brightness of the first illumination region R1 illuminated by the first illumination light 101 during the first period T1 relative to the average brightness of the first illumination region R1 illuminated by the first illumination light 101 during the first period T1 is 5% or more and 38% or less. This makes it possible to awaken the consciousness of the worker 300 without making the worker 300 uncomfortable.

(9) Modifications 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.

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 computer system's memory. The program may be pre-stored in the computer system's memory, provided via a telecommunications line, or stored on 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 known as system LSIs, very large-scale integrations (VLSIs), or ultra-large-scale integrations (ULSIs). Furthermore, field-programmable gate arrays (FPGAs), which are programmed after the LSI is manufactured, or logic devices capable of reconfiguring the connections within the LSI or the circuit partitions within the LSI, can also be used as processors. Multiple electronic circuits may be integrated into a single chip, or may be distributed across multiple chips. Multiple chips may be integrated into a single device, or may be 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 semiconductor integrated circuits or large-scale integrated circuits.

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

Conversely, in embodiment 1, at least some of the functions of lighting system 10 that are distributed across multiple devices may be consolidated within a single housing. For example, some of the functions of lighting system 10 that are distributed across first drive unit 2A and control unit 3 may be consolidated within a single housing.

In embodiment 1, 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 also be, for example, a television.

In embodiment 1, the first light source 1A and the second light source 1B are partition lights arranged between the electrical device 6 and the illumination surface S1 in the front-to-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 of the electrical device 6 (the surface opposite the surface on which the display screen 61 is provided), a desk lamp, or a base light attached to the ceiling surface.

In embodiment 1, 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 LEDs other than the four types of LEDs (for example, highly saturated blue LEDs) in addition to the four types of LEDs.

In embodiment 1, the first optical member 112 of the first light source 1A includes a linear Fresnel lens. However, instead of a linear Fresnel lens, the first optical member 112 may include multiple lenses that correspond one-to-one to the multiple LEDs of each type. Furthermore, the first optical member 112 may further include a diffusion sheet.

In embodiment 1, the input accepting unit 4 accepts input specifying the target light intensity value and the target light color value from a chromaticity diagram and GUI displayed on the monitor screen. Alternatively, the input accepting unit 4 may accept input specifying the target light intensity value and the target light color value from a CUI (Character-based User Interface), such as a physical keyboard or a virtual keyboard displayed on the monitor screen.

In embodiment 1, the camera possessed by the information detection unit 5 is a camera separate from the electrical device 6, but the camera possessed by the information detection unit 5 may also be a camera mounted on the electrical device 6.

In embodiment 1, the information detection unit 5 has a camera, but the information detection unit 5 may also have, for example, an electroencephalograph that detects the 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 fluctuation action described above if the worker 300 is in a tense state.

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 is in a tense state if the pulse wave is above the threshold. Then, the control unit 3 performs the fluctuation action described above if the worker 300 is in a tense state.

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

In embodiment 1, as shown in Figures 7 to 9, there is one first period T1, but the number of first periods T1 is not limited to one. For example, multiple first periods T1 may be provided within a predetermined period. In other words, the fluctuation operation may be performed multiple times within a predetermined period.

In embodiment 1, 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 equipped with the illumination surface S1.

(Embodiment 2)
A lighting system 10 according to a second embodiment will be described with reference to Figures 10 to 12. Constituent elements of the lighting system 10 according to the second embodiment that are the same as those of the lighting system 10 according to the first embodiment will be denoted by the same reference numerals and will not be described again.

The lighting system 10 according to the second embodiment differs from the lighting system 10 according to the first embodiment in that, in addition to the fluctuating operation according to the first illumination light 101, the lighting system 10 also performs the fluctuating operation according to the second illumination light 102.

In the lighting system 10 according to embodiment 2, the control unit 3 changes the light intensity of the first illumination light 101 during the first period T11. Furthermore, in the lighting system 10 according to embodiment 2, the control unit 3 changes the light intensity of the second illumination light 102 during the second period T21. That is, in the lighting system 10 according to embodiment 2, 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 different period from the first period T11, which is the light intensity change period.

In the lighting system 10 according to embodiment 2, as shown in FIG. 10A, the first period T11 is the period from time t12 to time t13, the period from time t14 to time t15, or the period from time t16 to time t17. Furthermore, in the lighting system 10 according to embodiment 2, as shown in FIG. 10B, the second period T21 is the period from time t11 to time t18. That is, in the lighting system 10 according to embodiment 2, the fluctuating operation using the first illumination light 101 is performed three times while the fluctuating operation using the second illumination light 102 is being performed. Furthermore, in the lighting system 10 according to embodiment 2, the fluctuating 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. Furthermore, in the lighting system 10 according to embodiment 2, 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. In other words, in the lighting system 10 according to the second embodiment, the second illumination light 102 fluctuates according to a circadian rhythm in which the second period T21 constitutes one cycle.

(2) Effects In the lighting system 10 according to the second embodiment, the light intensity of the first illumination light 101 in the first period (light intensity change period) T11 is changed at predetermined intervals based on the detection result of the information detection unit 5. This makes it possible to awaken the worker 300 more than when the light intensity of the first illumination light 101 is not changed at predetermined intervals. As a result, the worker 300 can more easily concentrate on the display screen 61 of the electrical device 6, and the efficiency of work using the electrical device 6 can be improved.

Furthermore, in the lighting system 10 according to embodiment 2, at least a portion of the first irradiation region R1 overlaps with the second irradiation region R2, which makes it possible to reduce the discomfort felt by the worker 300 compared to when the first irradiation region R1 does not overlap with the second irradiation region R2.

Furthermore, in the lighting system 10 according to embodiment 2, 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 illuminated surface S1 while making changes in the luminance of the illuminated surface S1 due to the second illumination light 102 less noticeable.

(3) Modifications The following are modifications of the second embodiment. The modifications described below can be applied in appropriate combinations.

(3.1) Modification 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 a 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.

In the lighting system 10 according to Modification 1, as shown in FIG. 11A, the periods from time t22 to time t23, from time t24 to time t25, and 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.

Furthermore, in the lighting system 10 according to Modification 1, as shown in FIG. 11B, 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 Modification 1, 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 the light intensity change period. Also in the lighting system 10 according to Modification 1, the length of the second period T22 is 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.

In the lighting system 10 according to Variation 1, 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.

(3.2) Modification 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 .

In the lighting system 10 according to Modification 2, as shown in FIG. 12A, the periods from time t32 to time t33, from time t34 to time t35, and from time t36 to time t37 are the first periods T13. That is, the control unit 3 performs a fluctuating operation using the first illumination light 101 during each of the first periods T13 described above. More specifically, the control unit 3 starts a fluctuating operation using the first illumination light 101 at times t32, t34, and t36, when the light intensity of the second illumination light 102 is different.

In addition, 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.

(3.3) Other Modifications Other modifications are listed below.

In embodiment 2 and variants 1 and 2, 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 length of the second period may be the same as the length of the first period. 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.

Furthermore, the configuration described in embodiment 2 (including modifications) can be applied in appropriate combination with the configuration described in embodiment 1 (including modifications).

(Aspects)
The present specification discloses the following aspects.

The lighting system (10) according to the first aspect comprises 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 area (R1) of an irradiation surface (S1) with a first illumination light (101). The second light source (1B) irradiates a second irradiation area (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 area (R1) is narrower than the second irradiation area (R2). At least a portion of the first irradiation area (R1) overlaps with the second irradiation area (R2). The control unit (3) changes the light intensity of the first illumination light (101) during the light intensity change period (T1) at a predetermined interval based on the user's biological information, which is the detection result of the information detection unit (5).

This aspect makes it possible to improve the efficiency of work using electrical equipment (6).

In the lighting 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).

This aspect makes it possible to more fully awaken 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.

In the lighting system (10) according to the third aspect, in the first or second aspect, the predetermined period is 0.06 Hz or more and 1.0 Hz or less.

This aspect reduces the likelihood that the worker (300) will feel uncomfortable.

In the lighting 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 minimum brightness of the first illuminated region (R1) by the first illumination light (101) during the light intensity change period (T1) relative to the average brightness of the first illuminated region (R1) by the first illumination light (101) during the light intensity change period (T1) is 5% or more and 38% or less.

This aspect makes it possible to awaken the worker (300) without causing discomfort to the worker (300).

In the lighting system (10) according to the 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) during the 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).

This aspect makes it possible to reduce the range of change in the first illumination light (101) relative to the second illumination light (102), thereby further reducing the discomfort felt by the worker (300).

In the lighting system (10) of the 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).

This aspect makes it possible to adjust the brightness (luminance) of the illuminated surface (S1) while making changes in the luminance of the illuminated surface (S1) caused by the second illumination light (102) less noticeable.

In the lighting system (10) of the 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).

This aspect makes it possible to increase the amount of change in the first illumination light (101) relative to the second illumination light (102).

In the lighting system (10) according to the eighth aspect, in any one of the first to seventh aspects, the brightness of the second illumination region (R2) is highest in the lower part of the second illumination region (R2).

This embodiment increases the brightness in the line of sight of the worker (300), improving the visibility of the display screen (61) of the electrical device (6).

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

This aspect makes it possible to provide a lighting system (10) that is integrally equipped with an illumination surface (S1).

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

According to this aspect, it is possible to form the second irradiation area (R2) over a wide area on the irradiation surface (S1), while forming the first irradiation area (R1) within a desired range.

The configurations according to the second to tenth aspects are not essential to the lighting system (10) and may be omitted as appropriate.

1A First light source 1B Second light source 3 Control unit 5 Information detection unit 6 Electrical device 61 Display screen 10 Illumination system 101 First illumination light 102 Second illumination light 111 First light-emitting unit 112 First optical member 121 Second light-emitting unit 122 Second optical member 200 Partition (member)
300 Operator (user)
R1: First irradiation area R2: Second irradiation area S1: Irradiation surface T1, T11, T12, T13: First period (light amount change period)
T21, T22, T23 Second period

Claims (10)

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. The saturation of the first illumination light is higher than the saturation of the second illumination light.
10. The lighting system of claim 1. 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. 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. 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. The length of the second period is longer than the length of the first period.
6. The lighting system of claim 5. The length of the second period is the same as the length of the first period.
6. The lighting system of claim 5. 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. Further comprising a member having the irradiation surface,
3. A lighting system according to claim 1 or 2. 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.