JP2024048534A - Lighting System - Google Patents

Abstract

[Problem] To provide a lighting system capable of adjusting the appearance of an illumination target illuminated with light. [Solution] A lighting system 10 includes a lighting fixture 12, a storage unit 24, and a control unit 25. The lighting fixture 12 has a plurality of light-emitting elements 27 each emitting different colors that can be individually controlled. The storage unit 24 stores a first mode in which the number of light colors and the color mixing ratio, which is the output ratio of each light color, are set so that the saturation of the color of the illumination target illuminated with the light emitted from the lighting fixture 12 is a first saturation, and a second mode in which the number of light colors and the color mixing ratio, which is the output ratio of each light color, are set so that the saturation of the color of the illumination target illuminated with the light emitted from the lighting fixture 12 is a second saturation different from the first saturation. The control unit 25 refers to the storage unit 24 for one chromaticity, and controls the lighting of the light-emitting elements 27 of each light color with the number of light colors and the color mixing ratio of the first mode or the second mode. [Selected Figure] FIG.

Description

An embodiment of the present invention relates to a lighting system.

Conventionally, lighting fixtures used for stage lighting, studio lighting, etc. have used halogen bulbs as light sources and combined them with color filters to adjust the light color to the desired level.

In recent years, lighting fixtures used for stage lighting, studio lighting, etc. have also adopted light-emitting elements such as LEDs as light sources, and the light color is adjusted using light-emitting elements with multiple light colors.

When light from such a light-emitting element is irradiated onto an object without using a color filter, the object may appear differently than when light from a conventional halogen bulb combined with a color filter is irradiated onto the object.

JP 2022-55685 A

The problem that this invention aims to solve is to provide a lighting system that can adjust the appearance of an object illuminated with light.

The lighting system of the embodiment includes a lighting fixture, a storage unit, and a control unit. The lighting fixture has a plurality of light-emitting elements each having a different light color that can be individually controlled. The storage unit stores a first mode in which the number of light colors and the color mixing ratio, which is the output ratio of each light color, are set so that the saturation of the color of the irradiation target irradiated with the light from the lighting fixture is a first saturation, and a second mode in which the number of light colors and the color mixing ratio, which is the output ratio of each light color, are set so that the saturation of the color of the irradiation target irradiated with the light from the lighting fixture is a second saturation different from the first saturation. The control unit refers to the storage unit for one chromaticity and controls the lighting of the light-emitting elements of each light color with the number of light colors and color mixing ratio of the first mode or the second mode.

The lighting system of the embodiment is expected to make it possible to adjust the appearance of the object illuminated with light.

FIG. 1 is a configuration diagram of a lighting system showing an embodiment. 1A and 1B show an example of light obtained by combining a halogen lamp and a color filter, where (a) is an xy chromaticity diagram and (b) is a spectral distribution diagram. 3A and 3B show an example of light in a first mode of the illumination system, in which FIG. 3A is an xy chromaticity diagram and FIG. 3B is a spectral distribution diagram. 4A and 4B show an example of light in a second mode of the above-mentioned lighting system, in which (a) is an xy chromaticity diagram, and (b) is a spectral distribution diagram. FIG. 2 is an xy chromaticity diagram showing a range in which the number of light colors in the second mode of the above lighting system is four or more.

An embodiment will be described below with reference to the drawings.

Figure 1 shows a configuration diagram of a lighting system 10. The lighting system 10 is used, for example, for stage lighting or studio lighting. The lighting system 10 comprises an operating device 11, which is a higher-level device, and one or more lighting fixtures 12 that are communicatively connected to the operating device 11. Although one lighting fixture 12 is shown in Figure 1, multiple lighting fixtures 12 installed on a stage or in a studio are connected to the operating device 11 directly or indirectly, for example, via a splitter or hub, or by a cascade connection.

Communication between the control device 11 and the lighting fixtures 12 uses signals of a communication protocol such as the DMX (Digital Multiplex) standard or the RDM (Remote Device Management) standard, which is an extension of the DMX standard that enables two-way communication. The control device 11 and the lighting fixtures 12 are connected by a DMX cable or other communication cable. When other communication cables are used, the control device 11 and the multiple lighting fixtures 12 are connected via a node that converts between signals of communication protocols such as DMX and RDM and signals of communication methods such as Art-net, Ethernet (registered trademark), and LAN.

Signals for communication protocols such as DMX and RDM include multiple channels for controlling lighting fixtures 12, with one or multiple channels assigned to each lighting fixture 12, and control information such as the dimming rate (brightness) of the lighting fixture 12 corresponding to each channel. The operating device 11 operates control items such as the dimming rate for each channel, and the lighting fixture 12 obtains and controls control information such as the dimming rate of the target channel assigned to it.

The operation device 11 is a dimmer console that operates the lighting fixtures 12 according to the scene on stage or in the studio. The operation device 11 includes a plurality of operation units 15 such as faders or wheels that can operate the dimming rate of the lighting fixtures 12, a display unit that displays setting, registration, or operation information, a control unit that controls the operation device 11, a storage unit that stores various information, and a communication unit that communicates with the lighting fixtures 12. FIG. 1 shows an example of faders as the operation unit 15, and a channel is assigned to each fader, and by operating the fader, the dimming rate of the lighting fixtures 12 to which the target channel is assigned can be operated. Note that the operation device 11 is not limited to a dimmer console, and may be a terminal device such as a personal computer or tablet.

The lighting fixtures 12 include various types of fixtures such as spotlights and horizon lights that are installed on stages and in studios.

The lighting device 12 includes a light source unit 20, a power supply unit 21 that turns on the light source unit 20, an optical system 22 that controls the emission of light from the light source unit 20, an operation unit 23 that is a setting unit for performing various settings, a memory unit 24 that stores various information, a control unit 25 that controls the light source unit 20, and a communication unit 26 that communicates with the operation device 11.

The light source unit 20 includes a substrate and a plurality of light-emitting elements 27 of different light colors that are individually controllable and mounted on the substrate. The light-emitting elements 27 may be, for example, SMD (Surface Mount Device) package type LEDs or CSP (Chip Scale Package) type LEDs. The light source unit 20 may also be a COB (Chip On Board) type light source, in which case the plurality of light-emitting elements 27 are arranged on one substrate. The light source unit 20 includes light-emitting elements 27 that emit at least one of red, green, blue, yellow, amber, cyan, and lime light colors, and the color of the light irradiated from the lighting fixture 12 can be adjusted by mixing the light from these light-emitting elements 27. The light source unit 20 has at least two types of light-emitting elements 27 that emit different light colors, and multiple light-emitting elements 27 of each light color are used and are mounted on the board in an arrangement that takes color mixing into consideration.

The power supply unit 21 supplies lighting power to the light-emitting element 27 for each light color according to the control of the control unit 25, lights up the light-emitting element 27 for each light color, and adjusts the brightness.

The optical system 22 includes a lens that focuses the light from the light source unit 20 and a reflector that reflects the light, and controls the illumination of the light from the lighting device 12.

The operation unit 23 allows the user to set various settings related to the lighting fixture 12, including the address of the lighting fixture 12, channel assignment, mode selection, etc. The operation unit 23 is equipped with a display unit such as an LCD display that displays setting information.

The memory unit 24 stores various settings. The settings stored in the memory unit 24 include the channel assigned to the lighting device 12, the mode set for each chromaticity of the light emitted from the lighting device 12, and registration information for the mode registered for each channel.

The modes include a first mode in which the number of light colors and the color mixing ratio, which is the output ratio of each light color, are set so that the saturation of the color of the irradiation target (irradiation target) to which the light is irradiated becomes a first saturation, and a second mode in which the number of light colors is set to one or more colors more than the first mode and the color mixing ratio is set so that the saturation of the color of the irradiation target to which the light is irradiated becomes a second saturation lower than the first saturation. The first mode and the second mode are set for each chromaticity for a predetermined number of chromaticities, and this setting information is stored in the storage unit 24. It is preferable that the chromaticity coordinates and color temperature of the light irradiated in the first mode are the same or approximately the same as the chromaticity coordinates and color temperature of the light irradiated in the second mode. In addition, the first saturation of the first mode is higher than the saturation of the light of the same chromaticity obtained by combining a halogen bulb and a color filter, and the second saturation of the second mode is lower than the saturation of the light of the same chromaticity obtained by combining a halogen bulb and a color filter. Furthermore, it is preferable that the brightness of the light in the first mode and the brightness of the light in the second mode are set together.

In this embodiment, saturation is an index of vividness, and examples of such indices include Gamut Index (Rg), Gamut Area Ratio (Ga), Gamut Area Index (GAI), Color-Discrimination Index (CDI), and Color Conspicuousness Index (FCI).

Either the first mode or the second mode of each chromaticity is registered and stored in the memory unit 24 for each channel. The first mode or the second mode of the chromaticity registered for each channel may be, for example, initially set by the manufacturer, or may be arbitrarily selected and set by the user. This mode may be set by the operation unit 23, or may be set by the operation device 11 if two-way communication by RDM is possible.

In addition, one channel may be set to switch between the first mode and the second mode depending on the dimming level.

Furthermore, the number of modes is not limited to two, the first mode and the second mode, and there may be three or more modes. For example, there may be a mode that has a color mixture ratio of intermediate saturation between the first mode and the second mode, and corresponds to the combination of a halogen light bulb and a color filter.

Furthermore, these modes may be stored not only in the memory unit 24 of the lighting device 12, but also in the memory unit of the operation device 11, or in another memory unit such as a server or cloud.

The control unit 25 also obtains control information such as the dimming rate of the assigned target channel from the signal received by the communication unit 26 from the operation device 11, controls the power supply unit 21, and controls the lighting of the light-emitting elements 27 of each light color in the light source unit 20.

When the control unit 25 acquires the dimming rate of the target channel, it refers to the memory unit 24, checks the chromaticity mode assigned to the target channel, and controls the lighting of the light-emitting elements 27 of the light source unit 20 with the number of light colors in the controlled mode and the color mixing ratio, which is the output ratio of each light color. In this case, when emitting light from the lighting device 12 in the second mode, the control unit 25 controls the lighting of the light-emitting elements 27 of each light color with a number of light colors and color mixing ratio that is one or more colors more than when emitting light from the lighting device 12 in the first mode.

The functions of the control unit 25 may be provided by the control unit of the operation device 11. In this case, the control unit of the operation device 11 checks the mode as described above from a memory unit provided in the operation device 11, and transmits to the lighting fixture 12 the number of light colors in the mode to be controlled, the color mixing ratio which is the output ratio of each light color, and the dimming rate, associated with a channel.

The communication unit 26 also communicates with the operation device 11 using signals of communication protocols such as the above-mentioned DMX and RDM.

In the lighting system 10, when the operation unit 15 of the operating device 11 is operated, the dimming rate is associated with the channel assigned to the operation unit 15 and transmitted to the lighting fixture 12.

When the control unit 25 of the lighting fixture 12 acquires control information such as the dimming rate of the target channel assigned to itself from the signal received by the communication unit 26 from the operation device 11, it controls the power supply unit 21 and controls the lighting of the light-emitting elements 27 of each light color of the light source unit 20.

At this time, when the control unit 25 acquires the dimming rate of the target channel, it refers to the memory unit 24, checks the chromaticity mode assigned to the target channel, and controls the lighting of the light emitting elements 27 of the light source unit 20 with the number of light colors in the controlled mode and the color mixing ratio, which is the output ratio of each light color.

Figures 2(a) and 2(b) show the xy chromaticity diagram and the spectral distribution diagram of the light obtained by combining a halogen bulb with a yellow color filter, Polycolor #40, manufactured by Tokyo Stage Lighting Co., Ltd.

A simulation of shining this light on a white surface showed that the chromaticity was yellow around 580 nm (black circle in Figure 2(a)), the saturation Rg was 36, the color fidelity Rf was 42, the relative color temperature CCT was 2489 K, and the color deviation Duv, which is the distance from the nearest point on the blackbody locus a, was 0.0166.

Figures 3(a) and 3(b) show the xy chromaticity diagram and the spectral distribution diagram of the light in the first mode at approximately the same chromaticity as the combination of the halogen bulb and color filter in Figure 2. In the first mode, two light colors, green (G) and red (R), are used, and the color mixture ratio is set to an output ratio of 29 parts green:20 parts red.

A simulation of shining this light on a white surface showed that the chromaticity was yellow around 580 nm (black circle in Figure 3(a)), the saturation Rg was 40, the color fidelity Rf was 21, the relative color temperature CCT was 2495 K, and the color deviation Duv, which is the distance from the nearest point on the blackbody locus a, was 0.0139.

In the first mode, for the light from the combination of a halogen bulb and color filter in Figure 2, even if the chromaticity is the same, the saturation is higher, and the illuminated object appears to have a vivid color.

Figures 4(a) and 4(b) show the xy chromaticity diagram and the spectral distribution diagram of the light in the second mode, which has approximately the same chromaticity as the combination of the halogen bulb and color filter in Figure 2. In the second mode, three light colors are used, green (G), red (R), and yellow (Y), which is one more color than in the first mode, and the color mixture ratio is set to an output ratio of 29 parts green, 2 parts red, and 55 parts yellow.

A simulation of shining this light on a white surface showed that the chromaticity was yellow around 580 nm (black circle in Figure 4(a)), the saturation Rg was 25, the color fidelity Rf was 30, the relative color temperature CCT was 2494 K, and the color deviation Duv, which is the distance from the nearest point on the blackbody locus a, was 0.0162.

In the second mode, even if the chromaticity is the same as that of the light from the combination of a halogen bulb and a color filter in Figure 2 and the light from the first mode, the saturation is lower, and the illuminated object appears slightly whitish and has a milder color tone.

Here, we have shown an example of yellow chromaticity, but the appearance of the object illuminated by the light can also be adjusted for other chromaticities.

Figure 5 shows an xy chromaticity diagram that shows area b surrounded by six points: red, amber, yellow, green, cyan, and blue. The black dots in Figure 5 show examples of the chromaticity of light that can be emitted by lighting device 12.

The chromaticity on or near the boundary line of area b is such that the number of light colors that can be mixed is small, so the first mode is realized with two light colors, and the second mode is realized with three light colors.

The number of light colors that can be mixed increases for the chromaticity inside area b as it approaches the center, making it easier to set the first and second modes, with the first mode being realized with two to three light colors and the second mode being realized with four or more light colors. By making the number of light colors in the second mode four or more, the illuminated object appears milder.

For chromaticities outside area b, the number of light colors that can be mixed is limited, so only the first mode may be set and the second mode may not be set.

In this way, the lighting system 10 has a first mode in which the number of light colors and the color mixing ratio, which is the output ratio of each light color, are set so that the saturation of the color of the object to be irradiated with light is a first saturation, and a second mode in which the number of light colors is one or more colors more than in the first mode and the color mixing ratio is set so that the saturation of the color of the object to be irradiated with light is a second saturation lower than the first saturation. By making the mode selectable, it is possible to adjust the appearance of the object to be irradiated with light.

The modes may be set to, for example, a mode that uses colors that make food or dishes look delicious, or a mode that uses colors that make skin look beautiful.

Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention and its equivalents described in the claims.

10 Lighting system 12 Lighting fixture 24 Memory unit 25 Control unit 27 Light-emitting element b Region

Claims (4)

A lighting fixture having a plurality of individually controllable light emitting elements each having a different light color;
a storage unit that stores a first mode in which a number of light colors and a color mixing ratio, which is an output ratio of each light color, are set so that the saturation of the color of an illumination target illuminated by the light emitted from the lighting device becomes a first saturation, and a second mode in which a number of light colors and a color mixing ratio, which is an output ratio of each light color, are set so that the saturation of the color of an illumination target illuminated by the light emitted from the lighting device becomes a second saturation different from the first saturation;
a control unit that refers to the storage unit for one chromaticity and controls the lighting of the light-emitting elements of each light color with the number of light colors and the color mixing ratio of the first mode or the second mode;
A lighting system comprising: The lighting system according to claim 1 , wherein a number of the light-emitting elements that are turned on according to the color mixing ratio in the first mode is different from a number of the light-emitting elements that are turned on according to the color mixing ratio in the second mode. 3. The lighting system according to claim 2, wherein the chromaticity coordinates of the irradiated light are chromaticity coordinates corresponding to a yellow light emission color, and the light-emitting elements of two colors, red and green, are turned on in the first mode, and the light-emitting elements of three colors, red, green, and yellow, are turned on in the second mode. The lighting system according to claim 3, characterized in that the chromaticity coordinates of the irradiated light are within a region surrounded by six points of red, amber, yellow, green, cyan, and blue on an xy chromaticity diagram, and in the second mode, four or more colors of the light-emitting elements are lit up.

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