JP2022175497A - Lighting system and lighting method - Google Patents

Abstract

To provide an illumination system and an illumination method capable of realizing output light having a high general color rendering index Ra and adjusting the chromaticity of the output light.SOLUTION: An illumination system realizes output light having a chromaticity value in a triangular area a (area 1a, area 2a, or area 3a) whose vertexes are two points out of point B indicating the chromaticity value of light emitted by a blue light source, a point G indicating the chromaticity value of light emitted by a green light source, and a point R indicating the chromaticity value of light emitted by a red light source, and a point W indicating the chromaticity value of light emitted by a white light source by causing two light sources corresponding to two points among the blue light source, the green light source, and the red light source, and the white light source to emit light.SELECTED DRAWING: Figure 4

Description

The present invention relates to lighting systems and lighting methods.

2. Description of the Related Art Conventionally, various techniques have been proposed for adjusting the color of output light from lighting devices (see, for example, Patent Document 1).

JP 2009-123429 A

The present invention provides an illumination system and illumination method capable of adjusting the chromaticity of output light that can achieve output light with a high general color rendering index Ra.

An illumination system according to an aspect of the present invention includes a first light source emitting light having a first chromaticity value, a second light source emitting light having a second chromaticity value, and light having a third chromaticity value. a control unit that controls a third light source that emits light and a fourth light source that emits light having a fourth chromaticity value; A triangular region whose vertices are the point indicating the chromaticity value and the point indicating the third chromaticity value includes the chromaticity range of the light source color defined in JISZ9112, and on the chromaticity coordinates, the third The points indicating the four chromaticity values are positioned within the chromaticity range, and the control unit controls the points indicating the first chromaticity value, the points indicating the second chromaticity value, and the third chromaticity value. The first light source, the second , two light sources corresponding to the two points among the third light sources, and the fourth light source emit light.

A lighting method according to an aspect of the present invention includes a first light source that emits light having a first chromaticity value, a second light source that emits light having a second chromaticity value, and light having a third chromaticity value. a third light source emitting light and a fourth light source emitting light having a fourth chromaticity value, the point indicating the first chromaticity value on the chromaticity coordinates, the second color A triangular region whose vertices are the point indicating the chromaticity value and the point indicating the third chromaticity value includes the chromaticity range of the light source color defined in JISZ9112, and on the chromaticity coordinates, the third The points indicating the four chromaticity values are positioned within the chromaticity range, and in the control step, the points indicating the first chromaticity value, the points indicating the second chromaticity value, and the third color The first light source, the first 2 light sources, two light sources among the third light sources corresponding to the two points, and the fourth light source are caused to emit light.

A program according to an aspect of the present invention is a program for causing a computer to execute the lighting method.

ADVANTAGE OF THE INVENTION According to this invention, the illumination system and illumination method which can adjust the chromaticity of output light which can implement|achieve output light with high general color rendering index Ra are provided.

FIG. 1 is a block diagram showing the functional configuration of the lighting system according to the embodiment. FIG. 2 is a diagram illustrating an example of emission spectra of a blue light source, a green light source, and a red light source included in the lighting system according to the embodiment; 3 is a diagram illustrating an example of an emission spectrum of a white light source included in the lighting system according to the embodiment; FIG. FIG. 4 is a diagram showing chromaticity coordinates plotted with chromaticity values of a red light source, a green light source, a blue light source, and a white light source. FIG. 5 is a first diagram showing the general color rendering index Ra and the special color rendering index R9 of output light obtained by the chromaticity control method in the lighting system according to the embodiment. FIG. 6 is a second diagram showing the general color rendering index Ra and the special color rendering index R9 of output light obtained by the chromaticity control method in the lighting system according to the embodiment. FIG. 7 is a third diagram showing the general color rendering index Ra and the special color rendering index R9 of output light obtained by the chromaticity control method in the lighting system according to the embodiment. FIG. 8 is a diagram showing an emission spectrum when output light with a color temperature of 2700 K and Duv=0 is realized by Control Example 1. In FIG. FIG. 9 is a diagram showing an emission spectrum when output light with a color temperature of 2700 K and Duv=0 is realized by the comparative example. FIG. 10 is a diagram showing the maximum luminous flux of output light obtained by the chromaticity control method in the lighting system according to the embodiment. FIG. 11 is a diagram showing chromaticity coordinates with boundary points plotted. FIG. 12 is a diagram illustrating an example of emission spectra of a blue light source, a green light source, and a red light source included in a lighting system according to a modification; FIG. 13 is a first diagram showing the general color rendering index Ra of the output light obtained by the chromaticity control method in the lighting system according to the modification. FIG. 14 is a second diagram showing the general color rendering index Ra of the output light obtained by the chromaticity control method in the lighting system according to the modification. FIG. 15 is a third diagram showing the general color rendering index Ra of the output light obtained by the chromaticity control method in the lighting system according to the modification.

Hereinafter, embodiments will be specifically described with reference to the drawings. It should be noted that the embodiments described below are all comprehensive or specific examples. Numerical values, shapes, materials, components, arrangement positions and connection forms of components, steps, order of steps, and the like shown in the following embodiments are examples and are not intended to limit the present invention. Further, among the constituent elements in the following embodiments, constituent elements not described in independent claims will be described as optional constituent elements.

Each figure is a schematic diagram and is not necessarily strictly illustrated. Moreover, in each figure, the same code|symbol is attached|subjected with respect to substantially the same structure, and the overlapping description may be abbreviate|omitted or simplified.

(Embodiment)
[Constitution]
First, the configuration of the lighting system according to the embodiment will be described. FIG. 1 is a block diagram showing the functional configuration of the lighting system according to the embodiment.

The illumination system 10 independently adjusts the blue light source 42b, the green light source 42g, the red light source 42r, and the white light source 42w included in the light source unit 42 included in the illumination device 40, thereby making the illumination device 40 suitable for the user. It is a system that can emit light with desired chromaticity. In other words, the lighting system 10 is a system that supports the chromaticity adjustment function of the lighting device 40 . The lighting system 10 includes an input device 20 , a control device 30 and a lighting device 40 . Note that the lighting system 10 may include a plurality of lighting devices 40 for one control device 30 .

The input device 20 receives input from the user for specifying chromaticity. The input device 20 is, for example, a portable information terminal such as a smart phone or a tablet terminal, but may be a stationary information terminal fixedly installed on a wall or the like. The input device 20 may be realized by installing an application program corresponding to the lighting system 10 in a general-purpose device, or may be a dedicated device for the lighting system 10 .

The control device 30 controls the lighting device 40 to emit light with the chromaticity input to the input device 20 . The control device 30 includes a control section 31 and a storage section 32 . Note that the input device 20 and the control device 30 may be realized as one integrated device.

The control unit 31 controls light emission of the lighting device 40 . Specifically, the control unit 31 can adjust the chromaticity of the light emitted by the lighting device 40 by transmitting a control signal to the lighting device 40 . For example, the control unit 31 transmits the control signal to the lighting device 40 through wireless communication, but may transmit the control signal to the lighting device 40 through wired communication. The control unit 31 is implemented by, for example, a microcomputer, but may be implemented by a processor. The functions of the control unit 31 are realized by executing a computer program stored in the storage unit 32 by a microcomputer or processor that constitutes the control unit 31 .

The storage unit 32 is a storage device that stores computer programs executed by the control unit 31 and various information necessary for controlling the lighting device 40 . The storage unit 32 is specifically implemented by a semiconductor memory or the like.

The lighting device 40 is installed, for example, indoors to illuminate the indoor space. The illumination device 40 is, for example, a ceiling light, but may be another illumination device such as a spotlight or a downlight. The illumination device 40 includes a dimming circuit 41 and a light source section 42 . The light source unit 42 includes a red light source 42r, a green light source 42g, a blue light source 42b, and a white light source 42w.

The dimming circuit 41 is a circuit that supplies power to the light source unit 42 according to a control signal transmitted from the control device 30 (control unit 31). The dimming circuit 41 includes, for example, a chopper control circuit. The control unit 31 changes the current supplied to the light source unit 42 by switching the switching element included in the dimming circuit 41 (chopper control circuit) according to the control signal. The light control circuit 41 can independently supply power (current) to each of the blue light source 42b, the green light source 42g, the red light source 42r, and the white light source 42w included in the light source section 42. That is, the dimming circuit 41 can independently dim the red light source 42r, the green light source 42g, the blue light source 42b, and the white light source 42w included in the light source section 42. FIG.

The blue light source 42b is a light source that emits blue light and is an example of a first light source. The blue light source 42b emits, for example, blue light with an emission peak wavelength of 380 nm or more and 480 nm or less (more specifically, includes blue and violet light). Blue light emitted by the blue light source 42b has, for example, an emission spectrum as shown in FIG. FIG. 2 is a diagram showing an example of the emission spectrum of the blue light source 42b (green light source 42g, red light source 42r). The blue light source 42b is specifically a light-emitting module using a blue LED, but the specific aspect of the blue light source 42b is not particularly limited.

The green light source 42g is a light source that emits green light and is an example of a second light source. The green light source 42g emits, for example, green light with an emission peak wavelength of 480 nm or more and 580 nm or less (more specifically, green-blue, blue-green, green, and yellowish-green light is included). Green light emitted by the green light source 42g has, for example, an emission spectrum as shown in FIG. The green light source 42g is specifically a light-emitting module using a green LED, but the specific aspect of the green light source 42g is not particularly limited.

The red light source 42r is a light source that emits red light and is an example of a third light source. The red light source 42r emits red light with an emission peak wavelength of 600 nm or more and 680 nm or less, for example. The red light emitted by the red light source 42r has, for example, an emission spectrum as shown in FIG. The red light source 42r is specifically a light-emitting module using a red LED, but the specific aspect of the red light source 42r is not particularly limited.

The white light source 42w is a light source that emits white light and is an example of a fourth light source. FIG. 3 is a diagram showing an example of the emission spectrum of white light emitted by the white light source 42w. FIG. 3 shows emission spectra when the color temperature of the white light emitted by the white light source 42w is 2700K, 3500K, and 6500K. Note that the chromaticity value of the white light emitted by the white light source 42w may be positioned within the chromaticity range of the light source color defined in JISZ9112, and may be white on the black body locus. It may be off-track white.

Specifically, the white light source 42w is a COB (Chip On Board) type light emitting module or an SMD (Surface Mount Device) type light emitting module. Also, the white light source 42w may be a remote phosphor type light emitting module.

[Chromaticity control example 1]
When controlling the chromaticity of the output light of the lighting device 40, the illumination system 10 selectively causes the blue light source 42b, the green light source 42g, the red light source 42r, and the white light source 42w to emit light, thereby rendering the output light. can improve sexuality. The output light is light obtained by synthesizing at least one of the light emitted by the red light source 42r, the light emitted by the green light source 42g, the light emitted by the blue light source 42b, and the light emitted by the white light source 42w. means the light finally emitted from the Chromaticity control example 1 of the lighting system 10 will be described below with reference to a chromaticity diagram (chromaticity coordinates). FIG. 4 is a diagram showing chromaticity coordinates in which chromaticity values of the red light source 42r, the green light source 42g, the blue light source 42b, and the white light source 42w are plotted. The chromaticity coordinates in FIG. 4 indicate the color space defined in CIE1931.

In the chromaticity coordinates of FIG. 4, the point B indicating the first chromaticity value of the blue light emitted by the blue light source 42b, the point G indicating the second chromaticity value of the green light emitted by the green light source 42g, and the red light source 42r. A point R representing the third chromaticity value of red light and a point W representing the fourth chromaticity value of white light emitted by the white light source 42w are shown.

On the chromaticity coordinates, a triangular region with points B, G, and R as vertices includes the chromaticity range of the light source color defined by JISZ9112. Here, the light source color means five types of daylight color (D), daylight white (N), white (W), warm white (WW), and light bulb color (L). The degree ranges are the five roughly parallelogram regions near the blackbody locus in FIG. Also, the point W is included in a triangular area having the points B, G, and R as vertices. Illumination system 10 can achieve output light having chromaticity values within a triangular region with points B, G, and R as vertices, and the chromaticity of output light that illumination system 10 can achieve It can be said that the range is relatively wide.

Here, the triangular area with points B, G, and R as vertices includes three areas, ie, area 1a, area 2a, and area 3a. The region 1a is a triangular region with points G, R, and W as vertices, the region 2a is a triangular region with points B, G, and W as vertices, and the region 3a is a triangular region with points B, R, and W as vertices.

For example, when the point indicating the chromaticity value desired by the user input to the input device 20 is located within the region 1a, the control unit 31 of the control device 30 does not cause the blue light source 42b to emit light, and the green light source 42g and the red light source 42g. By emitting light from the light source 42r and the white light source 42w and adjusting the light independently, output light having a chromaticity value desired by the user is realized. Similarly, when the point indicating the chromaticity value desired by the user input to the input device 20 is located within the region 2a, the control unit 31 of the control device 30 does not cause the red light source 42r to emit light, and the blue light source 42b, By emitting light from the green light source 42g and the white light source 42w and adjusting the light independently, output light having a chromaticity value desired by the user is realized. When the point indicating the chromaticity value desired by the user input to the input device 20 is located within the region 3a, the control unit 31 of the control device 30 controls the blue light source 42b and the red light source 42r without causing the green light source 42g to emit light. , and the white light source 42w, and by independently adjusting the light, output light having a chromaticity value desired by the user is realized.

Hereinafter, the general color rendering index Ra of the output light obtained by such a chromaticity control method will be described while comparing it with the general color rendering index Ra of the output light obtained by the chromaticity control method according to the comparative example. 5 to 7 are diagrams showing the general color rendering index Ra and the special color rendering index R9 of the output light obtained by the chromaticity control method (hereinafter also simply referred to as control example 1) in the illumination system 10. .

5 to 7 also show the general color rendering index Ra and the special color rendering index R9 of the output light obtained by the chromaticity control method according to the comparative example. The chromaticity control method according to the comparative example is to emit light from the three light sources of the blue light source 42b, the green light source 42g, and the red light source 42r without causing the white light source 42w to emit light, and adjust the light independently. is a control method for realizing output light having a chromaticity value desired by the user. In FIGS. 5 to 7, the output light is white light, and the general color rendering index Ra and special color rendering index R9 of the output light are shown when Duv=0 and Duv=3, respectively. 5 to 7, the horizontal axis indicates the color temperature (Tc) of the output light, and the vertical axis indicates the general color rendering index Ra or the special color rendering index R9 of the output light.

FIG. 5 shows the case where output light is realized using the red light source 42r, the green light source 42g, and the white light source 42w according to Control Example 1 when the color temperature of the white light source 42w is 2700 K (light bulb color: L). (RGL in FIG. 5) and the general color rendering index Ra when output light is realized using the white light source 42w, the green light source 42g, and the blue light source 42b according to Control Example 1 (LGB in FIG. 5) and special color rendering index R9. In FIG. 5, according to the comparative example, the general color rendering index Ra and the special color rendering index R9 when the output light is realized by the red light source 42r, the green light source 42g, and the blue light source 42b (RGB in FIG. 5) are also combined. Illustrated.

FIG. 6 shows the case where output light is realized using the red light source 42r, the green light source 42g, and the white light source 42w according to Control Example 1 when the color temperature of the white light source 42w is 3500 K (warm white: WW). (RGWW in FIG. 6), and when output light is realized using the white light source 42w, the green light source 42g, and the blue light source 42b according to Control Example 1 (WWGB in FIG. 6), the general color rendering index Ra and special color rendering index R9. In FIG. 6, according to the comparative example, the general color rendering index Ra and the special color rendering index R9 when the output light is realized by the red light source 42r, the green light source 42g, and the blue light source 42b (RGB in FIG. 6) are also combined. Illustrated.

FIG. 7 shows the case where output light is realized using the red light source 42r, the green light source 42g, and the white light source 42w according to Control Example 1 when the color temperature of the white light source 42w is 6500 K (neutral white: D). (RGD in FIG. 7) and the general color rendering index Ra when output light is realized using the white light source 42w, the green light source 42g, and the blue light source 42b according to Control Example 1 (DGB in FIG. 7) and special color rendering index R9. In FIG. 7, according to the comparative example, the general color rendering index Ra and the special color rendering index R9 when the output light is realized by the red light source 42r, the green light source 42g, and the blue light source 42b (RGB in FIG. 7) are also combined. Illustrated.

As shown in FIGS. 5 to 7, according to Control Example 1, it is possible to realize output light having a higher general color rendering index Ra and a higher special color rendering index R9 than those of the comparative example. The emission spectrum obtained by Control Example 1 and the emission spectrum obtained by Comparative Example are shown in FIGS. 8 and 9. FIG. FIG. 8 shows the emission spectrum when output light with a color temperature of 2700 K and Duv=0 is realized using the red light source 42 r, the green light source 42 g, and the white light source 42 w with a color temperature of 3500 K according to Control Example 1. FIG. 4 is a diagram showing; FIG. 9 is a diagram showing an emission spectrum when output light with a color temperature of 2700 K and Duv=0 is realized using the red light source 42r, the green light source 42g, and the blue light source 42b according to a comparative example.

As described above, in the illumination system 10, the control unit 31 outputs light having chromaticity values within the triangular region a (region 1a, region 2a, or region 3a) to the blue light source 42b and the green light source 42b. 42g and blue light source 42b, and white light source 42w. Thereby, the illumination system 10 can realize output light having a high general color rendering index Ra and a high special color rendering index R9. The lighting system 10 can improve the general color rendering index Ra of output light having, for example, a light source color (one of five types) defined in JISZ9112, and reduce color unevenness on the light irradiation surface.

Further, according to Control Example 1, it may be possible to increase the maximum light amount (brightness) of the output light more than the comparative example. FIG. 10 is a diagram showing the maximum luminous flux of the output light obtained by the chromaticity control method (control example 1) in the illumination system 10. As shown in FIG.

FIG. 10 shows output light of Duv=0 using the red light source 42r, the green light source 42g, and the white light source 42w according to Control Example 1 when the color temperature of the white light source 42w is 3500 K (warm white: WW). is realized (RGWW in FIG. 10), and when output light of Duv=0 is realized using the white light source 42w, the green light source 42g, and the blue light source 42b according to Control Example 1 (WWGB in FIG. 10) shows the maximum luminous flux of each. FIG. 10 also shows the maximum luminous flux when Duv=0 output light (RGB in FIG. 10) is realized by the red light source 42r, the green light source 42g, and the blue light source 42b according to the comparative example. As shown in FIG. 10, if the output light is realized using the red light source 42r, the green light source 42g, and the white light source 42w, the maximum light amount (brightness) of the output light can be significantly increased compared to the comparative example. can be done.

[Control example 2]
Chromaticity control example 2 of the illumination system 10 will be described with reference to a chromaticity diagram (chromaticity coordinates). 11 is a diagram showing chromaticity coordinates plotted with boundary points related to Control Example 2. FIG. The chromaticity coordinates in FIG. 11 indicate the color space defined in CIE1931. The chromaticity coordinates of FIG. 11 are basically the same as those of FIG. 4, but differ in that the boundary point B1, the boundary point G1, and the boundary point R1 are illustrated.

Boundary point B1 is a point located on a line segment connecting point B and point W. FIG. In FIG. 11, the boundary point B1 indicates the chromaticity value when the blue light source 42b corresponding to the point B and the white light source 42w corresponding to the point W are caused to emit light with maximum brightness. Any point (a point other than the point B and the point W) which is positioned on the line segment connecting the point B and the point W and which is positioned between the point B and the point W is sufficient.

The boundary point G1 is a point located on the line segment connecting the point G and the point W. As shown in FIG. In FIG. 11, the boundary point G1 indicates the chromaticity value when the green light source 42g corresponding to the point G and the white light source 42w corresponding to the point W are caused to emit light with maximum brightness. Any point (a point other than the point G and the point W) that is located on the line segment connecting the point G and the point W and is located between the point G and the point W is sufficient.

The boundary point R1 is a point located on a line segment connecting the point R and the point W. FIG. In FIG. 11, the boundary point R1 indicates the chromaticity value when the red light source 42r corresponding to the point R and the white light source 42w corresponding to the point W are caused to emit light at maximum brightness. Any point (a point other than the point R and the point W) which is located on the line segment connecting the point R and the point W and is located between the point R and the point W is sufficient.

In the control example 1 described above, the chromaticity values in the triangular region with the points B, G, and R as vertices are the two light sources of the blue light source 42b, the green light source 42g, and the red light source 42r. and the white light source 42w. Here, for the chromaticity values within the triangular region with the boundary point B1, the boundary point G1, and the boundary point R1 as vertices, all of the blue light source 42b, the green light source 42g, the red light source 42r, and the white light source 42w are By doing so, it is possible to achieve both an improvement in the general color rendering index Ra of the output light and an increase in the amount of the output light. Therefore, in Control Example 2, the control unit 31 sets the chromaticity values in the triangular region having the boundary point B1, the boundary point G1, and the boundary point R1 as the vertices of the blue light source 42b, the green light source 42g, and the red light source. This is achieved by causing all of 42r and white light source 42w to emit light and adjusting the light independently.

More specifically, the triangular area having the vertices at the boundary point B1, the boundary point G1, and the boundary point R1 includes a triangular area 1b having the vertices at the boundary point G1, the boundary point R1, and the point W, A triangular area 2b having the boundary point B1, the boundary point G1, and the point W as vertices, and a triangular area 3b having the boundary point B1, the boundary point R1, and the point W as the vertices are included. The region 1b is a partial region near the point W in the region 1a, the region 2b is a partial region near the point W in the region 2a, and the region 3b is a point in the region 3a. It is a partial area near W.

For example, the control unit 31 realizes output light having a certain chromaticity value within the region 1b as follows. The control unit 31 controls the first chromaticity value of each light source when realizing the above chromaticity value in the region 1b by causing the green light source 42g, the red light source 42r, and the white light source 42w to emit light without causing the blue light source 42b to emit light. Calculate the dimming value. Further, the second light control value of each light source when the above chromaticity value in the region 1b is realized by causing the blue light source 42b, the green light source 42g, and the red light source 42r to emit light without causing the white light source 42w to emit light is calculate. The control unit 31 sets the total light control value of the first light control value and the second light control value as the final light control value, so that the average color rendering of the output light having the chromaticity value in the region 1b is It is possible to achieve both an improvement in the evaluation number Ra and an increase in the amount of light.

Also, the control unit 31, for example, realizes output light having a certain chromaticity value within the region 2b as follows. The control unit 31 controls the chromaticity value in the region 2b by causing the blue light source 42b, the green light source 42g, and the white light source 42w to emit light without causing the red light source 42r to emit light. Calculate the dimming value. Further, the fourth light control value of each light source when the above chromaticity value in the region 2b is realized by causing the blue light source 42b, the green light source 42g, and the red light source 42r to emit light without causing the white light source 42w to emit light is calculate. The control unit 31 sets the total light control value of the third light control value and the fourth light control value as the final light control value. It is possible to achieve both an improvement in the evaluation number Ra and an increase in the amount of light.

Also, the control unit 31, for example, realizes output light having a certain chromaticity value within the region 3b as follows. The control unit 31 controls the chromaticity value in the region 3b by causing the blue light source 42b, the red light source 42r, and the white light source 42w to emit light without causing the green light source 42g to emit light. Calculate the dimming value. Further, the sixth light control value of each light source when the above chromaticity value in the region 3b is realized by causing the blue light source 42b, the green light source 42g, and the red light source 42r to emit light without causing the white light source 42w to emit light is calculate. The control unit 31 sets the total light control value of the fifth light control value and the sixth light control value as the final light control value, so that the average color rendering of the output light having the above chromaticity value in the region 3b is It is possible to achieve both an improvement in the evaluation number Ra and an increase in the amount of light.

It should be noted that application of control example 1 or application of control example 2 may be switched in the regions 1b, 2b, and 3b. For example, the control unit 31 operates in a color rendering emphasis mode that emphasizes the color rendering of output light having chromaticity values belonging to the areas 1b, 2b, and 3b, and the operation of the light amount emphasizing mode that emphasizes the light amount of output light having a chromaticity value belonging to . In the operation of the color-rendering-emphasized mode, as described in Control Example 1, the control unit 31 emits light from the two light sources of the blue light source 42b, the green light source 42g, and the red light source 42r, and the white light source 42w. , to realize chromaticity values belonging to regions 1b, 2b, and 3b. In the operation of the light amount emphasizing mode, as described in Control Example 2, the control unit 31 causes the blue light source 42b, the green light source 42g, the red light source 42r, and the white light source 42w to emit light, thereby And the chromaticity values belonging to region 3b are realized. The color-rendering-oriented mode is an example of the first mode, and the light-quantity-oriented mode is an example of the second mode. Such switching of operation modes is performed based on user input to the input device 20, for example.

[Modification]
In the above embodiment, the blue light emitted by the blue light source 42b, the green light emitted by the green light source 42g, and the red light emitted by the red light source 42r are realized by emitted light from LEDs. Here, the green light emitted by the green light source 42g and the red light emitted by the red light source 42r may be realized by fluorescence emitted by phosphors.

In this case, each of the green light source 42g and the red light source 42r includes, for example, an excitation light source realized by a blue LED or the like, and a phosphor-containing resin that seals the excitation light source. The phosphor constituting the green light source 42g is an yttrium _- aluminum _- garnet (YAG)-based green phosphor such as _{Y3 (} Al, Ga) _5O12 :Ce phosphor, but _Lu3Al5O12 : It may also be a lutetium-aluminum-garnet (LuAG)-based green phosphor, such as a Ce phosphor. The phosphor constituting the red light source 42r is a red phosphor such as CaAlSiN ₃ :Eu phosphor or (Sr,Ca)AlSiN ₃ :Eu phosphor. FIG. 12 is a diagram showing an example of emission spectra of the blue light source 42b according to the modification, the green light source 42g according to the modification, and the red light source 42r according to the modification.

As shown in FIG. 12, the emission spectra of the green light source 42g according to the modification and the red light source 42r according to the modification are similar to those of the green light source 42g according to the above embodiment and the red light source according to the above embodiment. It has a wider tail than the emission spectrum of 42r (FIG. 4). The half width of the emission spectrum of the green light source 42g according to the above embodiment and the red light source 42r according to the above embodiment is about 20 nm (10 nm or more and 30 nm or less). , the half width of the emission spectrum of the red light source 42r according to the modification is 60 nm or more and 100 nm or less. It should be noted that the blue light source 42b according to the modification is realized by an LED as in the blue light source 42b according to the above-described embodiment, and the half width of the emission spectrum of the blue light source 42b according to the modification is about 20 nm (10 nm or more). 30 nm or less).

Hereinafter, the general color rendering index Ra of the output light obtained by applying Control Example 1 to the three-color light sources according to these modified examples will be applied to the three-color light sources according to the modified examples. Description will be given while comparing with the general color rendering index Ra of the output light obtained by applying the method. 13 to 15 show the general color rendering index of the output light obtained by the chromaticity control method (control example 1) in the lighting system 10 according to the modification (the lighting system 10 including the three-color light sources according to the modification). It is a figure which shows Ra.

13 to 15, the output light is white light, and the general color rendering index Ra of the output light is shown when Duv=0 and when Duv=3. 13 to 15, the horizontal axis indicates the color temperature of the output light, and the vertical axis indicates the general color rendering index Ra of the output light.

FIG. 13 shows that when the color temperature of the white light source 42w is 2700 K (light bulb color: L), the red light source 42r according to the modification, the green light source 42g according to the modification, and the white light source 42w are controlled by the control example 1. (RGL in FIG. 13), and in Control Example 1, output light is realized using the white light source 42w, the green light source 42g according to the modification, and the blue light source 42b according to the modification. The general color rendering index Ra for each case (LGB in FIG. 13) is shown. In FIG. 13, according to the comparative example, the average color rendering when the output light is realized by the red light source 42r according to the modification, the green light source 42g according to the modification, and the blue light source 42b according to the modification (RGB in FIG. 13) The rating number Ra is also shown.

FIG. 14 shows that when the color temperature of the white light source 42w is 3500 K (warm white: WW), the red light source 42r according to the modification, the green light source 42g according to the modification, and the white light source 42w are controlled according to the control example 1. (RGWW in FIG. 14), and in Control Example 1, output light is realized using the white light source 42w, the green light source 42g according to the modification, and the blue light source 42b according to the modification. The general color rendering index Ra is shown for each case (WWGB in FIG. 14). In FIG. 14, according to the comparative example, the average color rendering when the output light is realized by the red light source 42r according to the modification, the green light source 42g according to the modification, and the blue light source 42b according to the modification (RGB in FIG. 14) The rating number Ra is also shown.

FIG. 15 shows that when the color temperature of the white light source 42w is 6500 K (neutral white: D), the red light source 42r according to the modification, the green light source 42g according to the modification, and the white light source 42w are controlled according to the control example 1. (RGD in FIG. 15), and in Control Example 1, output light is realized using the white light source 42w, the green light source 42g according to the modification, and the blue light source 42b according to the modification. 15 shows the general color rendering index Ra in each case (DGB in FIG. 15). In FIG. 15, according to the comparative example, the average color rendering when the output light is realized by the red light source 42r according to the modification, the green light source 42g according to the modification, and the blue light source 42b according to the modification (RGB in FIG. 15) The rating number Ra is also shown.

As shown in FIGS. 13 to 15, even when Control Example 1 is applied to the three-color light source according to the modification, output light having a general color rendering index Ra generally higher than that of the comparative example can be realized. .

[Effects, etc.]
As described above, the illumination system 10 includes a first light source emitting light having a first chromaticity value, a second light source emitting light having a second chromaticity value, and light having a third chromaticity value. A control unit 31 is provided for controlling a third light source that emits light and a fourth light source that emits light having a fourth chromaticity value. On the chromaticity coordinates, a triangular area whose vertices are the point indicating the first chromaticity value, the point indicating the second chromaticity value, and the point indicating the third chromaticity value is the light source color defined in JISZ9112. , and the point indicating the fourth chromaticity value on the chromaticity coordinates is located within the chromaticity range. The control unit 31 controls two points of the point indicating the first chromaticity value, the point indicating the second chromaticity value, and the point indicating the third chromaticity value, and the point indicating the fourth chromaticity value. output light having a chromaticity value within a triangular region a whose vertices are two light sources corresponding to two points among the first light source, the second light source, and the third light source, and the fourth light source It is realized by emitting light from the light source. In the above embodiment, the first light source is the blue light source 42b, the second light source is the green light source 42g, the third light source is the red light source 42r, and the fourth light source is the white light source. 42w. The region a is, for example, one of the regions 1a, 2a, and 3a in the above embodiment.

Such a lighting system 10 can achieve output light with a high general color rendering index Ra.

Further, for example, the control unit 31 controls the first boundary point located on the line segment connecting one of the two points and the point indicating the fourth chromaticity value in the region a, the other of the two points and the fourth color Output light having a chromaticity value within a triangular region b whose vertices are the second boundary point on the line segment connecting the points indicating the fourth chromaticity value and the point indicating the fourth chromaticity value is provided by the first light source, It is realized by causing the second light source, the third light source, and the fourth light source to emit light. The region b is, for example, one of the regions 1b, 2b, and 3b in the above embodiment.

Such an illumination system 10 can increase the maximum amount of output light having chromaticity values within region b.

Further, for example, the first boundary point is a point indicating the chromaticity value when each of the light source corresponding to one of the two points and the fourth light source emit light with maximum brightness, and the second boundary point is , a point indicating the chromaticity value when each of the light source corresponding to the other of the two points and the fourth light source is caused to emit light with maximum brightness. The first boundary point is, for example, one of the boundary point B1, the boundary point G1, and the boundary point B1 in the above embodiment, and the second boundary point is, for example, the boundary point B1, the boundary A point G1 and another one of the boundary points B1.

Such an illumination system 10 can increase the maximum amount of output light having chromaticity values within region b.

Further, for example, the control unit 31 controls a first mode that realizes output light having a chromaticity value within the region b by causing two light sources and a fourth light source to emit light; A second mode of control is selectively executed in which output light having a chromaticity value is realized by causing the first light source, the second light source, the third light source, and the fourth light source to emit light. The first mode is, for example, the color-rendering-oriented mode of the above-described embodiment, and the second mode is, for example, the light-quantity-oriented mode of the above-described embodiment.

Such an illumination system 10 can switch the implementation method (chromaticity control method) of the chromaticity value in the area b.

Also, a computer-implemented lighting method such as lighting system 10 includes a first light source emitting light having a first chromaticity value, a second light source emitting light having a second chromaticity value, a third chromaticity A control step of controlling a third light source emitting light having a value and a fourth light source emitting light having a fourth chromaticity value. On the chromaticity coordinates, a triangular area whose vertices are the point indicating the first chromaticity value, the point indicating the second chromaticity value, and the point indicating the third chromaticity value is the light source color defined in JISZ9112. , and the point indicating the fourth chromaticity value on the chromaticity coordinates is located within the chromaticity range. In the control step, two points of a point indicating a first chromaticity value, a point indicating a second chromaticity value, and a point indicating a third chromaticity value, and a point indicating a fourth chromaticity value Output light having a chromaticity value within a triangular region a having apexes are selected from two light sources corresponding to two points among the first light source, the second light source, and the third light source, and the fourth light source. It is realized by emitting light from the light source.

Such an illumination method can achieve output light with a high general color rendering index Ra.

(Other embodiments)
Although the embodiments have been described above, the present invention is not limited to the above embodiments.

For example, it is not essential that a blue light source, a green light source, and a red light source are used as the first light source, the second light source, and the third light source. As the first light source, the second light source, and the third light source, three light sources having chromaticity values that form a triangle containing the chromaticity range of the light source color on the chromaticity coordinates are used. Just do it.

In the above embodiments, the light emitted by the three-color light source is realized by the emitted light of the LED or the fluorescent light emitted by the phosphor. ) or emitted light from an inorganic EL element.

For example, although the lighting system was realized by a plurality of devices in the above embodiments, it may be realized as a single device. For example, the lighting system may be realized as a single device corresponding to the control device according to the above embodiments. When the lighting system is implemented by multiple devices, the components included in the lighting system described in the above embodiments may be distributed to the multiple devices in any way.

Further, in the above-described embodiments, the processing executed by a specific processing unit may be executed by another processing unit. In addition, the order of multiple processes may be changed, and multiple processes may be executed in parallel.

Also, in the above embodiments, each component may be realized by executing a software program suitable for each component. Each component may be realized by reading and executing a software program recorded in a recording medium such as a hard disk or a semiconductor memory by a program execution unit such as a CPU or processor.

Also, each component may be realized by hardware. Each component may be a circuit (or integrated circuit). These circuits may form one circuit as a whole, or may be separate circuits. These circuits may be general-purpose circuits or dedicated circuits.

Also, general or specific aspects of the present invention may be implemented in a system, apparatus, method, integrated circuit, computer program or recording medium such as a computer-readable CD-ROM. Also, any combination of systems, devices, methods, integrated circuits, computer programs and recording media may be implemented.

For example, the present invention may be implemented as a lighting method executed by a computer such as a lighting system, or may be implemented as a program for causing a computer to execute the lighting method, or such a program may be recorded. It may also be implemented as a non-transitory computer-readable recording medium.

In addition, forms obtained by applying various modifications to each embodiment that a person skilled in the art can think of, or realized by arbitrarily combining the constituent elements and functions of each embodiment without departing from the spirit of the present invention. Also included in the present invention.

1a, 1b, 2a, 2b, 3a, 3b area 10 lighting system 20 input device 30 control device 31 control section 32 storage section 40 lighting device 41 dimming circuit 42 light source section 42b blue light source 42g green light source 42r red light source 42w white light source

Claims (6)

A first light source emitting light having a first chromaticity value, a second light source emitting light having a second chromaticity value, a third light source emitting light having a third chromaticity value, and a fourth color. A control unit that controls a fourth light source that emits light having a degree value,
On the chromaticity coordinates, a triangular region whose vertices are the point indicating the first chromaticity value, the point indicating the second chromaticity value, and the point indicating the third chromaticity value is defined in JISZ9112. contains the chromaticity range of the light source color,
On the chromaticity coordinates, a point indicating the fourth chromaticity value is located within the chromaticity range,
The controller controls two points of a point indicating the first chromaticity value, a point indicating the second chromaticity value, and a point indicating the third chromaticity value, and the fourth chromaticity value. corresponding to the two points of the first light source, the second light source, and the third light source lighting system realized by causing the two light sources and the fourth light source to emit light. The control unit controls, in the area a, a first boundary point located on a line segment connecting one of the two points and the point indicating the fourth chromaticity value, the other of the two points and the fourth boundary point. Output light having a chromaticity value within a triangular region b having a second boundary point on a line segment connecting points indicating the chromaticity value and a point indicating the fourth chromaticity value as an apex is the first 2. The lighting system according to claim 1, realized by causing the light source, the second light source, the third light source, and the fourth light source to emit light. The first boundary point is a point indicating a chromaticity value when each of the light source corresponding to one of the two points and the fourth light source emits light with maximum brightness,
3. The second boundary point according to claim 2, wherein the second boundary point is a point indicating a chromaticity value when each of the light source corresponding to the other of the two points and the fourth light source emit light with maximum brightness. lighting system. The control unit controls a first mode that realizes output light having a chromaticity value within the region b by causing the two light sources and the fourth light source to emit light; Selectively controlling a second mode in which output light having a chromaticity value is realized by causing the first light source, the second light source, the third light source, and the fourth light source to emit light. 4. A lighting system according to claim 2 or 3. A first light source emitting light having a first chromaticity value, a second light source emitting light having a second chromaticity value, a third light source emitting light having a third chromaticity value, and a fourth color. controlling a fourth light source that emits light having a power value;
On the chromaticity coordinates, a triangular region whose vertices are the point indicating the first chromaticity value, the point indicating the second chromaticity value, and the point indicating the third chromaticity value is defined in JISZ9112. contains the chromaticity range of the light source color,
On the chromaticity coordinates, a point indicating the fourth chromaticity value is located within the chromaticity range,
In the control step, two points of a point indicating the first chromaticity value, a point indicating the second chromaticity value, and a point indicating the third chromaticity value, and the fourth chromaticity value output light having a chromaticity value within a triangular region a whose vertices are the points indicating the values, to the two points of the first light source, the second light source, and the third light source; A lighting method realized by causing two corresponding light sources and the fourth light source to emit light. A program for causing a computer to execute the lighting method according to claim 5.

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