lighting system

Abstract

To realize a presented illumination with a more colorful gradation.SOLUTION: The illumination system includes a first light source unit, a second light source unit, a first driving unit, a second driving unit, and a control unit. The first light source unit irradiates an irradiation surface with first illumination light of a chromatic color, the amount and the color of the first illumination light being variable. The second light source unit irradiates an irradiation surface with second illumination light different from the first illumination light, the amount and the color of the second illumination light being variable. The first light source unit and the second light source unit are formed so that at least a part of the application range of the first illumination light on the illumination surface overlaps with the application range of the second illumination light. The chromaticity of the first illumination light (a chromaticity point C1) is distant from the chromaticity of an equal-energy white point by at least 50 steps (a 50-step ellipse D1) in the MacAdam ellipse.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a lighting system, and more particularly to a lighting system for providing dramatic lighting. [Background technology]

[0002] An example of a conventional lighting device is disclosed in Patent Document 1. The lighting device disclosed in Patent Document 1 includes a lamp having a first light source unit and a second light source unit, and a power supply unit that turns on the first light source unit and the second light source unit separately. The first light source unit is configured to emit incandescent color light from a circular light-emitting portion. The second light source unit is arranged in a ring shape around the periphery of the first light source unit and is configured to emit light of a light color (daylight color or neutral white) different from incandescent color. The power supply unit includes a power supply unit that supplies power separately to the first light source unit and the second light source unit, and a control unit that adjusts the power supplied from the power supply unit to each light source unit.

[0003] Thus, the conventional lighting device can produce a gradation effect in which the light gradually becomes darker from the first illumination area of ​​the first light source unit to the second illumination area of ​​the second light source unit, which is located around the first illumination area. However, the light colors of the first and second light source units in the conventional lighting device are both whitish light colors (neutral white, daylight white, white, warm white, and warm white), and are achromatic or low-saturation colors. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-162407 Summary of the Invention [Problem to be solved by the invention]

[0005] In recent years, there has been a demand for dramatic lighting using gradation lighting that uses light of chromatic colors or highly saturated colors.

[0006] An object of the present disclosure is to provide a lighting system that can realize more vivid color gradation lighting. [Means for solving the problem]

[0007] An illumination system according to one aspect of the present disclosure includes a first light source, a second light source, a first drive unit, a second drive unit, and a control unit. The first light source irradiates an irradiation surface with a first chromatic illumination light, and the light intensity and light color of the first illumination light are variable. The second light source irradiates the irradiation surface with a second illumination light different from the first illumination light, and the light intensity and light color of the second illumination light are variable. The first drive unit drives the first light source to make the light intensity and light color of the first illumination light match a first light intensity target value and a first light color target value. The second drive unit drives the second light source to make the light intensity and light color of the second illumination light match a second light intensity target value and a second light color target value. The control unit provides the first light intensity target value and the first light color target value to the first drive unit, and provides the second light intensity target value and the second light color target value to the second drive unit. The first light source and the second light source are configured such that at least a portion of the illumination range of the first illumination light overlaps with the illumination range of the second illumination light on the illumination surface, and the chromaticity of the first illumination light is separated from the chromaticity of an equal-energy white point by 50 or more steps on the MacAdam ellipse. The light distribution characteristic of the first light source forms an angle with the light distribution characteristic of the second light source. On the irradiation surface, a part of the illumination range of the second illumination light is closer to the first light source and the second light source than the illumination range of the first illumination light. [Effects of the Invention]

[0008] The lighting system of the present disclosure has the effect of realizing more vivid color gradation lighting. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a system configuration diagram of a lighting system according to an embodiment of the present disclosure. [Figure 2] 2A and 2B are luminous intensity distribution curves showing the luminous intensity distribution characteristics of a first light source unit and a second light source unit in the lighting system of the same embodiment, respectively. [Figure 3] FIG. 3 is an explanatory diagram of an installation situation in the lighting system. [Figure 4] FIG. 4 is a chromaticity diagram for explaining the operation of the lighting system. [Figure 5] FIG. 5 is a chromaticity diagram for explaining the operation of the lighting system. [Figure 6] FIG. 6 is a diagram showing a color wheel for explaining the operation of the lighting system. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, lighting systems according to embodiments of the present disclosure will be described in detail with reference to the drawings. However, the drawings described in the following embodiments are schematic diagrams, and the ratios of the sizes and thicknesses of the components do not necessarily reflect the actual dimensional ratios. Note that the configurations described in the following embodiments are merely examples of the present disclosure. The present disclosure is not limited to the following embodiments, and various modifications are possible depending on the design, etc., as long as the effects of the present disclosure can be achieved.

[0011] (1) Overview The lighting system A1 according to the embodiment includes a first light source (first light source unit 1), a second light source (second light source unit 2), a first driving section 3A, a second driving section 3B, and a control section 4 (see FIG. 1).

[0012] The first light source unit 1 irradiates the irradiation surface S1 with a chromatic first illumination light L1, and the light intensity and color of the first illumination light L1 are variable. The second light source unit 2 irradiates the irradiation surface S1 with a second illumination light L2, which is different from the first illumination light L1, and the light intensity and color of the second illumination light L2 are variable (see FIG. 3).

[0013] The first driver 3A drives the first light source unit 1 so as to make the light intensity and light color of the first illumination light L1 match the first light intensity target value and the first light color target value. The second driver 3B drives the second light source unit 2 so as to make the light intensity and light color of the second illumination light L2 match the second light intensity target value and the second light color target value.

[0014] The control unit 4 provides a first light intensity target value and a first light color target value to the first driving unit 3A, and also provides a second light intensity target value and a second light color target value to the second driving unit 3B.

[0015] The chromaticity of the first illumination light L1 is 50 steps or more away from the chromaticity of the equal-energy white point on the MacAdam ellipse (see FIG. 4).

[0016] The lighting system A1 according to the embodiment is used for purposes of providing dramatic lighting (gradation lighting) on ​​an irradiation surface S1, such as the interior wall surface of a passenger car in a railway vehicle, the wall surface of a guest room in an accommodation facility, the wall surface of a corridor in a commercial facility, or other wall surface in a place where it is likely to be seen by people, or the ceiling surface thereof. The dramatic lighting provided by the lighting system A1 according to the embodiment is not simply indirect lighting, but lighting for providing gradation lighting on the irradiation surface S1 using first illumination light L1 and second illumination light L2, thereby creating a comfortable space including the irradiation surface S1.

[0017] Thus, the lighting system A1 according to the embodiment can realize more vivid color gradation illumination than when using illumination light of achromatic colors or low saturation colors (light colors) as in the conventional example. Note that among the white-based light colors (daylight white, natural white, white, warm white, and incandescent white) used in the conventional example, some chromaticity ranges of daylight white, daylight white, white, and warm white are generally included in a range of less than 50 steps on the MacAdam ellipse with respect to the chromaticity of the iso-energy white point.

[0018] (2) Details As shown in FIG. 1, the lighting system A1 according to the embodiment (hereinafter referred to as lighting system A1) includes a first light source unit 1, a second light source unit 2, a first driving unit 3A, a second driving unit 3B, a control unit 4, and an input receiving unit 5.

[0019] (2-1) First light source unit The first light source unit 1 has four types of light-emitting diodes (LEDs) that emit light of different colors, for example, a plurality of LEDs of each of the four colors R (red), G (green), B (blue), and W (white). However, the LEDs of the first light source unit 1 are not limited to the four colors R, G, B, and W, and may have one or more types of LEDs of the three colors R, G, and B or a color other than W (for example, a highly saturated blue). It is preferable that the plurality of LEDs of each color are electrically connected in series for each color and mounted on a substrate. In the following description, a plurality of LEDs of the same color mounted on a substrate may be collectively referred to as an LED module of ○ colors (red, green, blue, white).

[0020] The first light source unit 1 also includes a lens block. The lens block includes a linear Fresnel lens made of a translucent synthetic resin, such as acrylic resin or polycarbonate resin. Light emitted from the LED modules of each color is collected and mixed by the linear Fresnel lens to produce light (first illumination light L1) of a color corresponding to the ratio of the light intensities of the various colors. The light distribution characteristics of the first light source unit 1 are narrow-angle light distribution characteristics, as shown by the light distribution curves K1 and K2 in FIG. 2A (K1: vertical light distribution curve, K2: horizontal light distribution curve). However, instead of a linear Fresnel lens, the lens block may include multiple lenses corresponding one-to-one to the multiple LEDs in the LED modules of each color. Alternatively, the first light source unit 1 may include a light-scattering lens block or a diffusion sheet to enhance the color rendering properties of each color.

[0021] Furthermore, the first light source unit 1 has a housing 10 made of metal or synthetic resin (see FIG. 3). The housing 10 is formed in a box shape with one side open. The four-color LED module is housed in the housing 10 with the LEDs facing toward the open side. The lens block is attached to the housing 10 so as to cover the open side. The lens block may be attached so as to be displaceable relative to the housing 10.

[0022] (2-2) Second light source unit Like the first light source unit 1, the second light source unit 2 has four types of LEDs with different light colors, for example, a plurality of LEDs of four colors R, G, B, and W. However, the LEDs of the second light source unit 2 may be LEDs with light colors different from those of the LEDs of the first light source unit 1, and the second light source unit 2 may have one or more types of LEDs of colors other than R, G, and B or W (for example, a highly saturated blue). It is preferable that the plurality of LEDs of each color are electrically connected in series for each color and mounted on a board. Note that in the following description, a plurality of LEDs of the same color mounted on a board may be collectively referred to as an LED module of ○ colors (red, green, blue, white).

[0023] The second light source unit 2 also includes a diffusion sheet made of a translucent synthetic resin such as acrylic resin or polycarbonate resin. Therefore, the light emitted from the LED modules of each color is diffused and mixed by the diffusion sheet to produce light (second illumination light L2) of a color corresponding to the ratio of the light intensities of the various colors. The second light source unit 2 has a wide-angle light distribution characteristic, as shown by the light distribution curves K3 and K4 in FIG. 2B (K3: vertical light distribution curve, K4: horizontal light distribution curve). However, the second light source unit 2 may also include a lens block, similar to the first light source unit 1. The lens block preferably includes a plurality of lenses each corresponding to one of the LEDs included in the LED modules of each color.

[0024] Furthermore, the second light source unit 2 has a housing 20 made of metal or synthetic resin (see FIG. 3). The housing 20 is formed in a box shape with one side open. The four-color LED module is housed in the housing 20 with the LEDs facing toward the open side. The lens block is attached to the housing 20 so as to cover the open side. The lens block may be attached so as to be displaceable relative to the housing 20.

[0025] (2-3) First drive unit The first driving unit 3A has, for example, a power conversion circuit that converts AC power supplied from a commercial power system into DC power, and four constant current circuits.

[0026] The power conversion circuit includes, for example, a full-wave rectifier circuit such as a diode bridge, a boost chopper circuit, a smoothing capacitor, etc. 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.

[0027] All four constant current circuits have the same circuit configuration. The constant current circuits preferably include a buck converter, such as a step-down chopper circuit. The constant current circuits include a buck converter that steps down the DC voltage output from the power conversion circuit and operate to adjust the output current supplied to the LED module to a target current value. For example, the constant current circuits may receive a digital signal conforming to the DMX (Digital Multiplex) 512 communication protocol from the control unit 4 and control the buck converter in response to the digital signal. Alternatively, the constant current circuits may adjust the output current by PWM (pulse width modulation) control of the buck converter in response to a first light intensity target value and a first light color target value provided by the control unit 4, as described below.

[0028] The first driving section 3A is electrically connected to the first light source unit 1 via, for example, four electric cables. The four electric cables electrically connect the output terminals of the four constant current circuits of the first driving section 3A to the input terminals of the four LED modules of the first light source unit 1.

[0029] (2-4) Second drive unit Similar to the first drive unit 3A, the second drive unit 3B 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 3B have the same circuit configuration as the power conversion circuit and four constant current circuits of the first drive unit 3A, so a description thereof will be omitted.

[0030] The second driving section 3B is electrically connected to the second light source unit 2 via, for example, four electric cables. The four electric cables electrically connect the output terminals of the four constant current circuits of the second driving section 3B to the input terminals of the four LED modules of the second light source unit 2.

[0031] (2-5) Control unit The control unit 4 has, for example, a microcontroller and a memory, and is configured to execute various processes, which will be described later, by executing programs stored in the memory using the microcontroller.

[0032] The control unit 4 provides a first light intensity target value and a first light color target value to the first driving unit 3A, and also provides a second light intensity target value and a second light color target value to the second driving unit 3B.

[0033] The first illumination light is converted from the first light intensity target value and the first light color target value into dimming values ​​for the four LED modules, which are then converted into target current values ​​for the four constant current circuits of the first driver 3A. For example, assume that the first light intensity target value is 500 lm and the luminous flux ratio of the four LED modules relative to the first light color target value is 30% (R): 40% (G): 20% (B): 10% (W). Because the relationship between forward current and luminous flux characteristics differs for each LED module, if the conversion coefficients are set to 1.32 (R): 0.75 (G): 1.22 (B): 0.46 (W), the target current value of the constant current circuit corresponding to the red LED module is 500 lm × 30% × 1.32 = 198 mA. Similarly, the target current value of the constant current circuit corresponding to the green LED module is 500 lm × 40% × 0.75 = 150 mA. Similarly, the target current values ​​of the constant current circuits corresponding to the blue and white LED modules are 122 mA and 23 mA, respectively.

[0034] The second illumination light is converted from the second light intensity target value and the second light color target value into dimming values ​​for the four LED modules, which are then converted into target current values ​​for the four constant current circuits of the second driver 3B. For example, assume that the second light intensity target value is 800 lm and the luminous flux ratio of the four LED modules relative to the first light color target value is 20% (R): 30% (G): 40% (B): 10% (W). In this case, the target current value of the constant current circuit corresponding to the red LED module is 500 lm × 20% × 1.32 = 132 mA. Similarly, the target current value of the constant current circuit corresponding to the green LED module is 500 lm × 30% × 0.75 = 112.5 mA. Similarly, the target current values ​​of the constant current circuits corresponding to the blue and white LED modules are 244 mA and 23 mA, respectively.

[0035] The control unit 4 then provides the target current values ​​of each constant current circuit calculated as described above to the first drive unit 3A as the first light intensity target value and the first light color target value, and to the second drive unit 3B as the second light intensity target value and the second light color target value. However, if the constant current circuits are PWM controlled, the control unit 4 may convert the average value per unit time of the output current of the constant current circuit into a duty ratio for PWM control required to match the average value with each target current value, and provide the duty ratio to the first drive unit 3A and the second drive unit 3B.

[0036] (2-6) Input reception section The input receiving unit 5 receives an input specifying a first light intensity target value and a first light color target value, and also receives an input for selecting a virtual line segment G1 in a chromaticity diagram, which will be described later.

[0037] The input receiving unit 5 is configured, for example, by a general-purpose computer system. Here, the general-purpose computer system may be a so-called desktop or notebook personal computer, or may be a tablet terminal having an input device such as a touch panel mounted on a flat housing.

[0038] The input accepting unit 5, for example, displays a chromaticity diagram (e.g., an xy chromaticity diagram of the XYZ color system) on a monitor screen and accepts an arbitrary chromaticity point selected with a mouse pointer, a touch pen, or a fingertip as an input specifying a first light color target value. The input accepting unit 5 also displays a GUI (Graphical User Interface) such as a fader or slider on the monitor screen and accepts an arbitrary numerical value selected by operating the mouse pointer, a touch pen, or a fingertip as an input specifying a first light intensity target value. However, the input accepting unit 5 may also accept input specifying the first light intensity target value and the first light color target value from a character-based user interface (CUI) such as a physical keyboard or a virtual keyboard displayed on the monitor screen. Furthermore, the input accepting unit 5 accepts a chromaticity point selected on the chromaticity diagram on the monitor screen as an input specifying an end point for determining a virtual line segment G1.

[0039] The input receiving unit 5 complies with a communication protocol such as DMX512 and is connected to the control unit 4 via a communication line so as to be able to communicate bidirectionally with the control unit 4. The input receiving unit 5 then transmits information about the received input (x and y coordinates of the selected chromaticity point, numerical values ​​of faders, etc.) to the control unit 4 via the communication line.

[0040] (2-7) Installation of lighting system As shown in FIG. 3, the lighting system A1 is installed on a mounting table 6 provided below an irradiation surface S1 such as a wall surface.

[0041] The installation stand 6 has a flat bottom plate 60 arranged perpendicular to the irradiation surface S1, a flat front plate 61 protruding upward from one end (front end) of the bottom plate 60 in the short direction, and a pair of side plates 62 protruding upward from both ends of the bottom plate 60 in the longitudinal direction. In other words, the installation stand 6 is formed in the shape of a long box with the top of the bottom plate 60 open. However, one of the pair of side plates 62 is not shown in Figure 3. The bottom plate 60, the front plate 61, and the pair of side plates 62 are preferably formed from any one of metal, wood, and synthetic resin plates.

[0042] The first light source unit 1 is installed in a position closer to the front plate 61 than to the irradiation surface S1 in the internal space of the installation stand 6 (a space surrounded by the bottom plate 60, the front plate 61, the pair of side plates 62, and the irradiation surface S1). The first light source unit 1 is fixed to the pair of side plates 62 so that its optical axis is inclined toward the irradiation surface S1 with respect to the thickness direction (vertical direction) of the bottom plate 60. However, the first light source unit 1 may be installed on the inner bottom surface (upper surface of the bottom plate 60) of the installation stand 6 so that the opening surface of the housing 10 (the emission surface of the first illumination light L1) faces upward, and the lens block may be displaced (rotated) with respect to the housing 10 to incline the optical axis toward the irradiation surface S1.

[0043] The second light source unit 2 is installed on the inner bottom surface of the installation stand 6 so that the opening surface of the housing 20 (the emission surface of the second illumination light L2) faces upward. The second light source unit 2 is installed at a position closer to the irradiation surface S1 than the first light source unit 1 in the internal space of the installation stand 6.

[0044] Here, on the irradiation surface S1, the irradiation range F1 of the first illumination light L1 is wider in the up-down direction (vertical direction) than the irradiation range F2 of the second illumination light L2 and partially overlaps with the irradiation range F2 of the second illumination light L2 (see FIG. 3). Specifically, a first main irradiation range F11, where the illuminance is 30% or more when the maximum illuminance is 100% in the irradiation range F1 of the first illumination light L1, preferably overlaps at least a portion of a second main irradiation range F22, where the illuminance is 30% or more when the maximum illuminance is 100% in the irradiation range F2 of the second illumination light L2. Note that in FIG. 3, the dashed curve M1 indicates the illuminance distribution of the first illumination light L1 on the irradiation surface S1, and the dashed-dotted curve M2 indicates the illuminance distribution of the second illumination light L2 on the irradiation surface S1. In FIG. 3, dashed dotted lines T1 and T2 indicate lines where the illuminance of the first illumination light L1 and the second illumination light L2 is 30%, respectively.

[0045] As described above, the peaks of the first illumination light L1 and the second illumination light L2 on the illumination surface S1 are easily recognized as a single peak due to at least a partial overlap between the first main illumination area F11 of the first light source unit 1 and the second main illumination area F22 of the second light source unit 2. As a result, the illumination system A1 can improve the appearance of the gradation illumination on the illumination surface S1 compared to when the peaks of the first illumination light L1 and the second illumination light L2 on the illumination surface S1 are recognized separately.

[0046] (2-8) Lighting system settings Next, the procedure for setting gradation illumination in the illumination system A1 will be described. Then, setting information for the scene (hereinafter referred to as scene data) set by the setting procedure described below is stored in the memory of the control unit 4. In the following description, "scene" refers to the gradation illumination realized by irradiating the first illumination light L1 and second illumination light L2 set in the setting work onto the illumination surface S1. Furthermore, "scene data" refers to the first light intensity target value and first light color target value of the first illumination light L1, and the second light intensity target value and second light color target value of the second illumination light L2.

[0047] (2-8-1) First illumination setting An operator (hereinafter referred to as the operator) performing the setting work first sets a first light intensity target value and a first light color target value of the first illumination light L1. However, it is preferable that the operator perform the setting work of the first light intensity target value and the first light color target value while visually observing the first illumination light L1 irradiated onto the irradiation surface S1 from the first light source unit 1. Alternatively, the operator may perform the setting work of the first light intensity target value and the first light color target value while reproducing on the monitor screen of a computer system the situation when the first illumination light is irradiated onto the irradiation surface.

[0048] The operator sets the first light intensity target value and the first light color target value required to reproduce a scene corresponding to a weather pattern, such as a blue sky or a crimson sky, or a scene corresponding to a natural environment, such as a forest, deep sea, or clear stream. To set a blue sky scene, the operator selects a blue chromaticity point C1 on the chromaticity diagram displayed on the monitor screen. The chromaticity diagram on the monitor screen displays a curve D1 (hereinafter referred to as the "50-step ellipse") connecting chromaticity points 50 steps apart on a MacAdam ellipse with respect to the chromaticity of the equal-energy white point (see Figure 4). The 50-step ellipse D1 is defined by an elliptical formula with center coordinates (0.3333, 0.3333), semimajor axis (0.1174), semiminor axis (0.0481), and a tilt θ [deg] (58.9840) of the major axis relative to the x-axis. That is, the 50-step ellipse D1 roughly corresponds to the area expressed as "(tinted) white" shown in Reference Figure 1 "General chromaticity classification of color names" of the Japanese Industrial Standard JIS Z8110-1995. The light color within the 50-step ellipse D1 is perceived as having only a slight tint, making it difficult to imagine it as colored light. Therefore, by having the operator select a chromaticity point outside the 50-step ellipse D1 that has a strong tint, it becomes possible to efficiently realize lighting with a suitable color gradation. Thus, by displaying the 50-step ellipse D1 on a chromaticity diagram on a monitor screen, the lighting system A1 can guide the operator to select a chromaticity point outside the 50-step ellipse D1 that is suitable for the light color combination.

[0049] After selecting the chromaticity point C1, the operator operates a fader displayed on the monitor screen to select a light intensity (any value between 0% and 100%). The chromaticity coordinates and light intensity of the chromaticity point C1 selected by the operator are then received by the input receiving unit 5. The control unit 4 determines a first light intensity target value and a first light color target value of the first illumination light L1 based on the chromaticity coordinates and light intensity of the chromaticity point C1 received by the input receiving unit 5.

[0050] (2-8-2) Second illumination setting Next, the operator sets a second light intensity target value and a second light color target value for the second illumination light L2. However, it is preferable that the light color of the second illumination light L2 be a light color at a chromaticity point that is not complementary to the first illumination light L1. A complementary color relationship is a combination of colors that are diametrically opposed on the color wheel, resulting in a strong sense of color contrast. At the point where the hue intensities of the two colors intersect at approximately the same level, a dim, achromatic state without a sense of color is perceived. The inventors have confirmed that when the first illumination light L1 and the second illumination light L2 are complementary, it is not possible to create a gradation of desirable colors on the illumination surface S1.

[0051] The input receiving unit 5 displays an imaginary line segment G1 on a chromaticity diagram (see FIG. 5) that connects the chromaticity (chromaticity point C1) of the first illumination light L1 selected by the operator with an arbitrary chromaticity (chromaticity point C2) of the second illumination light L2, and that is 25 or more steps away on the MacAdam ellipse from the chromaticity of the iso-energy white point. Here, the curve connecting the chromaticity points that are 25 steps away on the MacAdam ellipse from the chromaticity of the iso-energy white point is called a 25-step ellipse D2 (see FIG. 5). This 25-step ellipse D2 is defined by an elliptical formula with center coordinates (0.3333, 0.3333), semi-major axis (0.0587), semi-minor axis (0.0240), and tilt θ [deg] (58.9840) of the major axis relative to the x-axis. In other words, the 25-step ellipse D2 roughly corresponds to the "white" area shown in Reference Figure 1, "General chromaticity classification of color system names," of the Japanese Industrial Standard JIS Z8110-1995. Therefore, chromaticity combinations connected by line segments that include the area of ​​the 25-step ellipse D2 are considered to have a complementary color relationship, and conversely, chromaticity combinations on line segment G1 that do not intersect with the area of ​​the 25-step ellipse D2 are chromaticity combinations that do not give the impression of white (achromatic color).

[0052] The lighting system A1 has the advantage that the operator can select chromaticity point C3 on the line segment G1 displayed on the chromaticity diagram by the input receiving unit 5, thereby making the observer perceive a continuous gradation of colors in the gradation illumination of the illumination surface S1.

[0053] Here, the control unit 4 adjusts the light intensity of the second illumination light L2 according to the distance (color difference) between the chromaticity point C3 of the second illumination light L2 and the chromaticity point C1 of the first illumination light L1, which is received by the input receiving unit 5. For example, the control unit 4 increases the light intensity of the second illumination light L2 as the color difference between the two chromaticity points C1 and C3 increases, and decreases the light intensity of the second illumination light L2 as the color difference between the two chromaticity points C1 and C3 decreases. In other words, the control unit 4 links the second light intensity target value and the second light color target value provided to the second drive unit 3B.

[0054] That is, when the illumination system A1 increases the light intensity of the second illumination light L2 as the color difference between the two chromaticity points C1 and C3 increases, it can realize gradation illumination that emphasizes the color of the first illumination light L1 and the color of the second illumination light L2. On the other hand, when the illumination system A1 decreases the light intensity of the second illumination light L2 as the color difference between the two chromaticity points C1 and C3 decreases, it can realize gradation illumination that emphasizes the color of the first illumination light L1.

[0055] The chromaticity coordinates of the chromaticity point C3 on the line segment G1 selected by the operator are received by the input receiving unit 5, and the light intensity of the second illumination light L2 corresponding to the color difference between the chromaticity point C3 and the chromaticity point C1 of the first illumination light L1 is received by the input receiving unit 5. The control unit 4 determines the second light intensity target value and the second light color target value of the second illumination light L2 based on the chromaticity coordinate and light intensity of the chromaticity point C3 received by the input receiving unit 5. The control unit 4 then stores the first light intensity target value and the first light color target value of the first illumination light L1 and the second light intensity target value and the second light color target value of the second illumination light L2 as scene data in memory. Note that the control unit 4 preferably assigns a unique identification code (e.g., a two-digit scene number) to each scene to distinguish between multiple scenes, and stores each scene number in association with the scene data for that scene number in memory.

[0056] The above setting procedure completes the setting work for gradation lighting in the lighting system A1.

[0057] (2-9) Lighting system operation Next, the operation of the lighting system A1 will be described.

[0058] A user of lighting system A1 operates input receiving unit 5 to select an arbitrary scene number. Upon receiving input of the scene number selected by the user, input receiving unit 5 notifies control unit 4 of the received scene number. Control unit 4 reads from memory scene data corresponding to the scene number notified by input receiving unit 5, and calculates target current values ​​for each constant current circuit or duty ratios for PWM control of each constant current circuit based on the read scene data. Furthermore, control unit 4 provides the calculated target current values ​​(or duty ratios) for each constant current circuit to first drive unit 3A and second drive unit 3B.

[0059] The first driving unit 3A drives the first light source unit 1 in accordance with the target current values ​​(or duty ratios) of the constant current circuits given by the control unit 4, causing the first illumination light L1 that matches the first light intensity target value and the first light color target value to be irradiated onto the irradiation surface S1. Similarly, the second driving unit 3B drives the second light source unit 2 in accordance with the target current values ​​(or duty ratios) of the constant current circuits given by the control unit 4, causing the second illumination light L2 that matches the second light intensity target value and the second light color target value to be irradiated onto the irradiation surface S1. As a result, on the irradiation surface S1, a main illumination range F11 of the first illumination light L1 and a main illumination range F22 of the second illumination light L2 partially overlap and mix, thereby realizing gradation illumination.

[0060] (3) Variations In the lighting system A1, the first light source unit 1 and the second light source unit 2 may be housed in a single housing. By housing the first light source unit 1 and the second light source unit 2 in a single housing, the lighting system A1 can improve the workability of installing the first light source unit 1 and the second light source unit 2.

[0061] In the lighting system A1, at least one of the first light source unit 1 and the second light source unit 2 may be installed above the irradiation surface S1.

[0062] Furthermore, the input receiving unit 5 may display a uniform chromaticity diagram (e.g., a u'v' chromaticity diagram) on the monitor screen instead of the xy chromaticity diagram of the XYZ color system and receive input. That is, a uniform chromaticity diagram has a higher uniformity between the distance on the chromaticity diagram and the actual color difference than an xy chromaticity diagram. Therefore, by using a uniform chromaticity diagram, the lighting system A1 can improve the operability of inputting the first light color target value and the second light color target value using the input receiving unit 5.

[0063] Instead of storing the first light intensity target value, the first light color target value, the second light intensity target value, and the second light color target value in memory as scene data, the control unit 4 may provide each target value in real time to the first driving unit 3A and the second driving unit 3B to realize gradation lighting. Furthermore, the input receiving unit 5 may represent the hue points of each chromaticity diagram as a circle, and display a hue circle with the MacAdam ellipse as a circle on the monitor screen, as shown in Figure 6.

[0064] (4) Summary An illumination system (A1) according to a first aspect of the present disclosure includes a first light source (first light source unit 1), a second light source (second light source unit 2), a first drive unit (3A), a second drive unit (3B), and a control unit (4). The first light source irradiates an irradiation surface (S1) with a first chromatic illumination light (L1), and the light intensity and light color of the first illumination light (L1) are variable. The second light source irradiates the irradiation surface (S1) with a second illumination light (L2) different from the first illumination light (L1), and the light intensity and light color of the second illumination light (L2) are variable. The first drive unit (3A) drives the first light source so that the light intensity and light color of the first illumination light (L1) match first light intensity target values ​​and first light color target values. The second driving unit (3B) drives the second light source so that the light intensity and light color of the second illumination light (L2) match the second light intensity target value and second light color target value. The control unit (4) provides the first driving unit (3A) with the first light intensity target value and the first light color target value, and also provides the second driving unit (3B) with the second light intensity target value and the second light color target value. The first light source and the second light source are configured such that at least a portion of the illumination range (F1) of the first illumination light (L1) overlaps with the illumination range (F2) of the second illumination light (L2) on the illumination surface (S1). The chromaticity of the first illumination light (L1) is separated from the chromaticity of the equal-energy white point by 50 steps or more on the MacAdam ellipse.

[0065] The lighting system (A1) according to the first aspect can realize gradation lighting with more vivid colors than when using illumination light of achromatic colors or colors (light colors) with low saturation as in conventional examples.

[0066] An illumination system (A1) according to a second aspect of the present disclosure can be realized by combining it with the first aspect. In the illumination system (A1) according to the second aspect, it is preferable that the light distribution characteristic of the first light source forms an angle with the light distribution characteristic of the second light source. It is preferable that, on the illumination surface (S1), a part of the illumination range (F2) of the second illumination light (L2) is closer to the first light source and the second light source than the illumination range (F1) of the first illumination light (L1).

[0067] The lighting system (A1) according to the second aspect can expand the range of gradation lighting on the irradiation surface (S1) by positioning a portion of the illumination range (F2) of the second illumination light (L2) closer to the first light source and the second light source than the illumination range (F1) of the first illumination light (L1) on the irradiation surface (S1).

[0068] An illumination system (A1) according to a third aspect of the present disclosure can be realized by combining it with the second aspect. In the illumination system (A1) according to the third aspect, it is preferable that a first main illumination range (F11) having an illuminance of 30% or more when the maximum illuminance in the illumination range (F1) of the first illumination light (L1) is 100% overlaps with at least a part of a second main illumination range (F22) having an illuminance of 30% or more when the maximum illuminance in the illumination range (F2) of the second illumination light (L2) is 100%.

[0069] In the illumination system (A1) according to the third aspect, the peaks of the first illumination light (L1) and the second illumination light (L2) on the illumination surface (S1) are easily recognized as a single peak because the first main illumination range (F11) of the first light source and the second main illumination range (F22) of the second light source at least partially overlap. As a result, the illumination system (A1) can improve the appearance of gradation illumination on the illumination surface (S1) compared to when the peaks of the first illumination light (L1) and the second illumination light (L2) on the illumination surface (S1) are recognized separately.

[0070] An illumination system (A1) according to a fourth aspect of the present disclosure can be realized by combining it with the second or third aspect. In the illumination system (A1) according to the fourth aspect, the chromaticity of the second illumination light (L2) preferably coincides with the chromaticity on an imaginary line segment (G1) in a chromaticity diagram. The imaginary line segment (G1) is a line segment connecting the chromaticity of the first illumination light (L1) with any chromaticity of the second illumination light (L2), and is preferably at least 25 steps away from the chromaticity of the equal-energy white point on the MacAdam ellipse.

[0071] The lighting system (A1) according to the fourth aspect allows the observer to perceive a continuous gradation of colors in the gradation illumination of the illumination surface (S1) by selecting a chromaticity point on the line segment (G1) displayed on the chromaticity diagram.

[0072] An illumination system (A1) according to a fifth aspect of the present disclosure can be realized by combining it with any one of aspects 2 to 4. In the illumination system (A1) according to the fifth aspect, it is preferable that the control unit (4) links the second light intensity target value and the second light color target value provided to the second drive unit (3B).

[0073] The lighting system (A1) according to the fifth aspect links the second light intensity target value and the second light color target value given to the second drive unit (3B) by the control unit (4), thereby improving the workability of setting the second light intensity target value and the second light color target value.

[0074] An illumination system (A1) according to a sixth aspect of the present disclosure can be realized by combining with any one of aspects 2 to 5. In the illumination system (A1) according to the sixth aspect, it is preferable that the control unit (4) determines a second light intensity target value to be given to the second driving unit (3B) according to a color difference between the second light color target value to be given to the second driving unit (3B) and the first light color target value.

[0075] In the lighting system (A1) according to the sixth aspect, the control unit (4) determines the second light intensity target value to be given to the second driving unit (3B) in accordance with the color difference between the second light color target value and the first light color target value to be given to the second driving unit (3B), and therefore gradation lighting according to the color difference can be easily realized.

[0076] An illumination system (A1) according to a seventh aspect of the present disclosure can be realized by combining it with the sixth aspect. In the illumination system (A1) according to the seventh aspect, it is preferable that the control unit (4) increases the second light intensity target value as the color difference increases.

[0077] The illumination system (A1) according to the seventh aspect can realize gradation illumination in which the color of the first illumination light (L1) and the color of the second illumination light (L2) are perceived more strongly by increasing the second light intensity target value as the color difference increases. Conversely, the illumination system (A1) according to the seventh aspect can realize gradation illumination in which the color of the first illumination light (L1) is perceived more strongly by decreasing the second light intensity target value as the color difference decreases.

[0078] An illumination system (A1) according to an eighth aspect of the present disclosure can be realized by combining it with any of the second to seventh aspects. The illumination system (A1) according to the eighth aspect preferably further comprises an input receiving unit (5) that receives input specifying a first light intensity target value and a first light color target value. The control unit (4) preferably provides the first light intensity target value and the first light color target value specified by the input received by the input receiving unit (5) to the first driving unit (3A). The control unit (4) preferably provides the second driving unit (3B) with a second light intensity target value and a second light color target value corresponding to the first light intensity target value and the first light color target value provided to the first driving unit (3A).

[0079] In the lighting system (A1) according to the eighth aspect, the control unit (4) provides the second light intensity target value and the second light color target value corresponding to the first light intensity target value and the first light color target value to the second driving unit (3B) through input received by the input receiving unit (5), thereby eliminating the need for work to have the input receiving unit (5) receive input in order to specify the second light intensity target value and the second light color target value, thereby improving the workability of the setting work. [Explanation of symbols]

[0080] A1 Lighting System 1 First light source unit (first light source) 2 Second light source unit (second light source) 3A First drive unit 3B Second drive unit 4. Control section 5 Input reception section L1 1st illumination light L2 2nd illumination light S1 irradiation surface F1 Illumination range of the first illumination light F2 Second illumination light irradiation range G1 Imaginary line segment F11 First main illumination range F22 Second main illumination range

Claims

1. a first light source that irradiates an irradiation surface with a first illumination light of a chromatic color, and the light amount and light color of the first illumination light are variable; a second light source that irradiates the irradiation surface with second illumination light different from the first illumination light, and the light amount and light color of the second illumination light are variable; a first driving unit that drives the first light source so that the light intensity and light color of the first illumination light match first light intensity target values ​​and first light color target values; a second driving unit that drives the second light source so that the light intensity and light color of the second illumination light match second light intensity target values ​​and second light color target values; a control unit that provides the first light intensity target value and the first light color target value to the first drive unit and provides the second light intensity target value and the second light color target value to the second drive unit; Equipped with the first light source and the second light source are configured such that at least a part of an illumination range of the first illumination light overlaps with an illumination range of the second illumination light on the illumination surface; the chromaticity of the first illumination light is at least 50 steps away from the chromaticity of the equal-energy white point on the MacAdam ellipse; the light distribution characteristic of the first light source is at an angle with respect to the light distribution characteristic of the second light source, On the irradiation surface, a part of the irradiation range of the second illumination light is closer to the first light source and the second light source than the irradiation range of the first illumination light. Lighting system.

2. A first main irradiation range in which the illuminance is 30% or more when the maximum illuminance is 100% in the irradiation range of the first illumination light overlaps at least a part of a second main irradiation range in which the illuminance is 30% or more when the maximum illuminance is 100% in the irradiation range of the second illumination light.

10. The lighting system of claim 1.

3. The chromaticity of the second illumination light coincides with the chromaticity on a virtual line segment in a chromaticity diagram, the imaginary line segment is a line segment that connects the chromaticity of the first illumination light and an arbitrary chromaticity of the second illumination light, and is spaced apart from the chromaticity of an equal-energy white point by 25 steps or more on the MacAdam ellipse.

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

4. The control unit links the second light intensity target value and the second light color target value to be given to the second drive unit. A lighting system according to any one of claims 1 to 3.

5. The control unit determines the second light intensity target value to be given to the second driving unit according to a color difference between the second light color target value to be given to the second driving unit and the first light color target value. A lighting system according to any one of claims 1 to 4.

6. The control unit increases the second light intensity target value as the color difference increases.

6. The lighting system of claim 5.

7. Further comprising an input receiving unit that receives input specifying the first light intensity target value and the first light color target value; The control unit determines the first light intensity target value specified by the input received by the input receiving unit. and the first light color target value is given to the first driving unit, and the second light amount target value and the second light color target value corresponding to the first light amount target value and the first light color target value given to the first driving unit are given to the second driving unit. A lighting system according to any one of claims 1 to 6.

Images