Lighting fixture, dimming control system

Abstract

The present invention provides illumination that takes into account the influence on the human body. The lighting fixture has: a first light-emitting device that emits light with a high melanopsin ratio at a first chromaticity coordinate in the chromaticity diagram of the CIE1931 color system, a second light-emitting device that emits light at a second chromaticity coordinate, and a third light-emitting device that emits light with a low melanopsin ratio at a third chromaticity coordinate, and includes light in the range from a first temperature to a second temperature on the blackbody radiation locus within the region of a triangle surrounded by a straight line connecting the first chromaticity coordinate and the second chromaticity coordinate, a straight line connecting the second chromaticity coordinate and the third chromaticity coordinate, and a straight line connecting the third chromaticity coordinate and the first chromaticity coordinate.

Description

Technical Field

[0001] The present invention relates to lighting fixtures and dimming control systems. Background Art

[0002] In buildings such as offices, factories, commercial facilities, or homes, lighting has become an indispensable element. Lighting is used to illuminate various activity places for people such as work, shopping, or gathering.

[0003] In the prior art, for such indoor lighting, the luminous efficacy and the high color rendering property are important parameters for evaluating the lighting performance. Patent Document 1 discloses a light-emitting device with a high color rendering property having an average color rendering evaluation number of 90 or more.

[0004] On the other hand, in recent years, there has also been a trend of paying attention to the influence on the human body in forming a human working environment. For example, in the WELL certification (Well Building Standard) established by the IWBI (International WELL Building Institute), buildings such as offices are evaluated from multiple items such as air, water, food, light, and comfort, and certification is given by meeting the criteria.

[0005] For example, regarding the light item in the WELL certification, consideration of the visual environment, consideration of the circadian rhythm, and consideration of glare from appliances or sunlight become necessary evaluation items, and the color rendering property is not essential but an additional item. Thus, in lighting for illuminating an indoor space for human work, it is required to consider the influence on the human body, not limited to excellent color rendering property.

[0006] Prior Art Documents

[0007] Patent Documents

[0008] Patent Document 1: Japanese Patent Application Laid-Open No. 2018-129492 Summary of the Invention

[0009] Problems to be Solved by the Invention

[0010] An object of the present invention is to provide lighting that takes into account the influence on the human body.

[0011] Solutions to the Problems

[0012] The lighting fixture disclosed as one embodiment through this specification controls color rendering within the range of a correlated color temperature from a first temperature to a second temperature that is more than 2000K higher than the first temperature. The lighting fixture includes: a first light-emitting device that emits light having a luminous color with first chromaticity coordinates where the values of x and y in the chromaticity coordinates are below the values of x and y at the second temperature on the blackbody radiation locus in the chromaticity diagram of the CIE1931 color system; a second light-emitting device that emits light having a luminous color with second chromaticity coordinates where the value of x in the chromaticity coordinates is above the value of x at the first temperature on the blackbody radiation locus in the chromaticity diagram of the CIE1931 color system; a third light-emitting device that emits light having a luminous color with third chromaticity coordinates where the value of x in the chromaticity coordinates is a first value and the value of y is a second value, and where, when a straight line passing through the first temperature and the second temperature on the blackbody radiation locus is represented by a function of x and y, the second value is greater than the value of y when the first value is substituted for x in the function; in the chromaticity diagram of the CIE1931 color system, within the region of a triangle surrounded by a straight line connecting the first chromaticity coordinates and the second chromaticity coordinates, a straight line connecting the second chromaticity coordinates and the third chromaticity coordinates, and a straight line connecting the third chromaticity coordinates and the first chromaticity coordinates, there is light within the range from the first temperature to the second temperature on the blackbody radiation locus. In the control of color rendering from the first temperature to the second temperature, at least the first light-emitting device, the second light-emitting device, and the third light-emitting device are used. When light with a correlated color temperature of 5000K is emitted on the blackbody radiation locus, the value of the melanopsin ratio becomes 1.0 or more. When the light is color-rendered within the range of a correlated color temperature of 3000K to 5000K on the blackbody radiation locus, the change amount of the value of the melanopsin ratio is 0.4 or more.

[0013] In addition, the dimming control system disclosed in the present specification as one embodiment has: one or more lighting fixtures and an information processing device communicably connected to a dimming driver of the lighting fixture and configured to adjust the illumination light of the lighting fixture within a range from a first temperature to a second temperature of a relevant color temperature. The information processing device has: a dimming determination unit that determines a control command for the dimming driver in order to control the dimming driver to adjust the illumination light of the lighting fixture; a transmission unit that transmits the control command determined by the dimming determination unit to the dimming driver. The control range of color adjustment performed by the information processing device is within a region surrounded by a set of points located at a distance twice the distance from a point on a straight line connecting the first temperature and the second temperature on the blackbody radiation locus to a point on the blackbody radiation locus at the same relevant color temperature as that point, with respect to all points on the straight line between the first temperature and the second temperature in the chromaticity diagram of the CIE1931 color system, and at least for any relevant color temperature between the first temperature and the second temperature, it is within the inner side of the outer frame rather than on the outer frame of the region.

[0014] Advantages of the Invention

[0015] According to the present invention, it is possible to provide illumination that takes into account the influence on the human body as compared with the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A diagram showing curves of circadian rhythm response and visual sensitivity response.

[0017] Figure 2 A perspective view of the lighting fixture of the embodiment as viewed from the light emitting surface side.

[0018] Figure 3 A perspective view of the lighting fixture of the embodiment as viewed from the installation surface side.

[0019] Figure 4 A top view for explaining the light emitting surface of the lighting fixture of the embodiment.

[0020] Figure 5 A schematic structural diagram of the light emitting device of the embodiment.

[0021] Figure 6 An example of the emission spectrum of the first light emitting device used in the lighting fixture of the embodiment.

[0022] Figure 7 An example of the emission spectrum of the second light emitting device used in the lighting fixture of the embodiment. A perspective view of the lighting fixture with a power adapter of the embodiment.

[0023] Figure 8 This is an example of the emission spectrum of the third light-emitting device used in the lighting fixture of the embodiment.

[0024] Figure 9 This is a graph showing the chromaticity coordinates in the chromaticity diagram of the first to third light-emitting devices that form an example of the lighting fixture of the embodiment.

[0025] Figure 10 This is a graph showing the chromaticity coordinates in the chromaticity diagram of the first to third light-emitting devices that form an example of the lighting fixture of the embodiment.

[0026] Figure 11 This is a graph showing the chromaticity coordinates in the chromaticity diagram of the first to third light-emitting devices that form an example of the lighting fixture of the embodiment.

[0027] Figure 12 This is a graph showing the chromaticity coordinates in the chromaticity diagram of the first to third light-emitting devices that form an example of the lighting fixture of the embodiment.

[0028] Figure 13 This is a graph showing the chromaticity coordinates in the chromaticity diagram of the first to third light-emitting devices that form an example of the lighting fixture of the embodiment.

[0029] Figure 14 This is a graph comparing the respective examples of the lighting fixtures of the embodiment in terms of the relative melanopsin ratio.

[0030] Figure 15 This is a structural diagram showing an example of the dimming control system of the embodiment.

[0031] Figure 16A This is a schematic structural diagram showing an example of another embodiment of the light-emitting device of the embodiment.

[0032] Figure 16B This is a schematic structural diagram showing an example of another embodiment of the light-emitting device of the embodiment.

[0033] Figure 16C This is a schematic structural diagram showing an example of another embodiment of the light-emitting device of the embodiment. Detailed Embodiments

[0034] First, the influence of lighting on the human body will be described.

[0035] When taking the WELL certification described in the background art as an example, lighting design that takes into account the circadian rhythm is required. It should be noted that taking into account the circadian rhythm means taking into account the circadian rhythm (circadian rhythm).

[0036] The circadian rhythm of a person is longer than one day, about 25 hours. If it is not set to one day, that is, it is not matched with the 24-hour cycle, it will become a rhythm cycle that deviates from one day. Therefore, light plays an important role as a tuning factor for matching with 24 hours. By bathing in the light of the sun, the human body clock is adjusted to 24 hours, and thus, people are born to live in a one-day rhythm of waking up early and going to bed late.

[0037] In other words, in order to live in a 24-hour rhythm, the human body has a tuning function that uses light. Specifically, there is a very small area called the suprachiasmatic nucleus in the hypothalamus of the brain, which plays the role of an internal clock that controls the circadian rhythm. In addition, as cells that give light signals to the suprachiasmatic nucleus, there are intrinsically photosensitive retinal ganglion cells (ipRGC) on the retina.

[0038] ipRGCs contain a light-receiving protein called melanopsin, which has been shown to be involved in the light tuning of circadian rhythms. Melanopsin has absorption characteristics that correspond to the wavelength of light, with a peak at around 480nm to 490nm.

[0039] In addition, melanopsin is believed to be involved in the secretion or inhibition of melatonin, a sleep-promoting hormone, for example, by increasing the amount of stimulation to ipRGC to inhibit the secretion of melatonin. It should be noted that the peak of melatonin secretion in the body usually occurs at night, and sleep is promoted by secreting melatonin. Therefore, the secretion of melatonin is inhibited during the day.

[0040] In the WELL certification, the equivalent melanopic illuminance (EML) is introduced to evaluate whether the lighting design takes the circadian rhythm into consideration. The EML is calculated by the following formula (1).

[0041] EML = Illuminance × Meranopic Ratio (1)

[0042] In addition, the melanopsin ratio (hereinafter referred to as MR) in the formula (1) is obtained by the following formula (2).

[0043]

[0044] Here, Light represents the spectral distribution of light achieved by a lighting fixture, Circadian represents the circadian response based on the spectral sensitivity characteristics of melanopsin having a peak around 480 nm to 490 nm, and Visual represents the visual sensitivity response.Figure 1 It is a diagram showing curves representing circadian rhythm response and visual sensitivity response.

[0045] As can be seen from Equation (1), as the direction for increasing the value of EML, two methods are considered: increasing illuminance or increasing MR. Additionally, it can be seen that the dependence on the characteristics of the circadian rhythm shows that MR is greater than illuminance. Therefore, in terms of considering the circadian rhythm, it is considered preferable to consider the value of MR. Moreover, based on the circadian rhythm response, the luminous intensity in the wavelength range of approximately 470 nm to 490 nm is considered to be a wavelength band that is particularly helpful for controlling the secretion of melatonin.

[0046] Hereinafter, embodiments for implementing the present invention will be described with reference to the accompanying drawings. However, the embodiments shown below are for embodying the technical idea of the present invention and do not limit the present invention. Moreover, in the following description, the same names and symbols represent the same or homogeneous components, and detailed descriptions will be appropriately omitted. It should be noted that the size or positional relationship of the components shown in each drawing may be exaggerated for clarity of explanation. In addition, the relationship between color names and chromaticity coordinates, the relationship between the wavelength range of light and the color names of monochromatic light, etc. follow JIS Z8110.

[0047] <Embodiment>

[0048] The lighting fixture of the embodiment will be described. Figure 2 It is a perspective view of the lighting fixture 1 as viewed from the light-emitting surface side. Figure 3 It is a perspective view of the lighting fixture 1 as viewed from the installation surface side (the side opposite to the light-emitting surface side). Additionally, Figure 4 It is a diagram showing the light-emitting surface of the lighting fixture 1. It should be noted that Figure 4 In this figure, a part of the cover 40 of the lighting fixture 1 is removed to show the internal structure. Figure 5 It is a schematic cross-sectional view of the light-emitting device 10 included in the lighting fixture 1.

[0049] The lighting fixture 1 is composed of at least three light-emitting devices 10 having different chromaticity coordinates in the CIE1931 colorimetric diagram (hereinafter, simply referred to as the colorimetric diagram). Here, these three light-emitting devices 10 are respectively distinguished as the first light-emitting device 101, the second light-emitting device 102, and the third light-emitting device 103.

[0050] By using these three light-emitting devices 10 included in the lighting fixture 1, it is possible to adjust the color of the illumination light within a specified range of color temperatures. Here, the range of color temperatures controlled by the lighting fixture 1 is recorded as the first temperature to the second temperature. This range of color temperatures needs to be within the maximum range of color temperatures that can be adjusted for the lighting fixture 1, but does not need to be the maximum range. However, the illumination light of the lighting fixture 1 is controlled within the range of color temperatures of 2000 K or higher.

[0051] For example, consider the case where the first temperature is set to 2700K and the second temperature is set to 6500K (color adjustment is performed in the range of a color temperature of 3800K). Additionally, for example, consider the case where the first temperature is set to 3000K and the second temperature is set to 5000K (color adjustment is performed in the range of a color temperature of 2000K).

[0052] Furthermore, in the lighting fixture 1, by appropriately combining three light-emitting devices 10 having different chromaticity coordinates, when controlling color adjustment, it is possible to irradiate illumination light along the blackbody radiation locus while considering the circadian rhythm.

[0053] Here, in the chromaticity diagram, the chromaticity coordinates of the light emitted through the first light-emitting device 101 are set as the first chromaticity coordinates, the chromaticity coordinates of the light emitted through the second light-emitting device 102 are set as the second chromaticity coordinates, and moreover, the chromaticity coordinates of the light emitted through the third light-emitting device are set as the third chromaticity coordinates.

[0054] Since the illumination light is controlled from the first temperature to the second temperature along the blackbody radiation locus, in the lighting fixture 1, the region of the triangle connecting the three points of the first chromaticity coordinates, the second chromaticity coordinates, and the third chromaticity coordinates contains at least the light in the range from the first temperature to the second temperature, and the color deviation duv from the blackbody radiation locus measured according to JIS Z8725 is 0.00, that is, the light on the blackbody radiation locus.

[0055] Furthermore, the three light-emitting devices 10 satisfy the following conditions.

[0056] In the chromaticity diagram, for the first light-emitting device 101, the values of x and y in the first chromaticity coordinates are equal to or less than the values of x and y at the second temperature on the blackbody radiation locus. Additionally, preferably, the value of x in the first chromaticity coordinates is 0.1 or more less than the value of x at the second temperature on the blackbody radiation locus. Also, in the chromaticity diagram, the value of x in the first chromaticity coordinates is 0.1 or more and 0.2 or less. Moreover, in the chromaticity diagram, the value of y in the first chromaticity coordinates is 0.2 or more and 0.3 or less. Additionally, the first light-emitting device 101 uses a light-emitting device with a high MR value.

[0057] In the chromaticity diagram, for the second light-emitting device 102, the value of x in the second chromaticity coordinates is equal to or more than the value of x at the first temperature on the blackbody radiation locus. Also, in the chromaticity diagram, the value of x in the second chromaticity coordinates is 0.45 or more and 0.6 or less. Moreover, in the chromaticity diagram, the value of y in the second chromaticity coordinates is equal to or less than the value of y at the first temperature on the blackbody radiation locus. In the chromaticity diagram, the value of y in the second chromaticity coordinates is 0.3 or more and 0.5 or less. Additionally, the second light-emitting device 102 uses a light-emitting device with a low MR value.

[0058] In the chromaticity diagram of the third light-emitting device 103, the third chromaticity coordinates are in the +y direction relative to the straight line passing through the first temperature and the second temperature on the blackbody radiation locus. That is, when the x value of the third chromaticity coordinates is the first value, the y value of the third chromaticity coordinates is greater than the y value obtained by substituting the first value into the x values of the function representing the straight line. Here, the y value of the third chromaticity coordinates when the x value of the third chromaticity coordinates is the first value is referred to as the second value. In the third chromaticity coordinates, the x value is less than or equal to the x value at the second temperature on the blackbody radiation locus, and the y value is greater than or equal to the y value at the second temperature on the blackbody radiation locus.

[0059] In addition, in the chromaticity diagram of the CIE1931 color system of the third light-emitting device 103, the x value in the third chromaticity coordinates is 0.1 or more and 0.6 or less. In the chromaticity diagram of the CIE1931 color system, the x value in the third chromaticity coordinates may also be 0.4 or more and 0.5 or less. In the chromaticity diagram of the CIE1931 color system, the x in the third chromaticity coordinates may also be 0.3 or more and 0.4 or less. In addition, in the chromaticity diagram, the y value in the third chromaticity coordinates is 0.3 or more and 0.6 or less. In addition, the third light-emitting device 103 uses a light-emitting device with an MR value lower than that of the first light-emitting device 101 and higher than that of the second light-emitting device 102.

[0060] Regarding the first light-emitting device 101, a high MR value means that the MR value is close to about 2.00 or greater than it. The MR value of the first light-emitting device 101 is preferably 2.00 or more, more preferably 2.50 or more, and further preferably 2.80 or more. The higher the MR value, the more the secretion of melatonin is suppressed. It should be noted that the MR value in the first light-emitting device 101 is 3.00 or less. However, the upper limit value may also exceed 3.00.

[0061] Regarding the second light-emitting device 102, a low MR value means that the MR value is close to about 0.40 or less than it. It is preferably 0.40 or less, more preferably 0.30 or less, and further preferably 0.25 or less. The lower the MR value, the more the secretion of melatonin is promoted. It should be noted that the MR value in the second light-emitting device 102 is 0.0 or more.

[0062] The third light-emitting device 103 may also adopt the following light-emitting device, that is, in the chromaticity diagram, when the value of x in the third chromaticity coordinates is less than 0.1 or more than the middle value of the value of x in the first chromaticity coordinates and the value of x in the second chromaticity coordinates, the MR value is 1.0 or more. On the other hand, when it is more than 0.1 or more than this middle value, a light-emitting device with a high MR value of 0.5 or less can be adopted. In addition, when it is less than ±0.1 from this middle value, a light-emitting device with an MR value of 0.5 or more to 1.0 or less can be adopted. The MR value of the third light-emitting device 103 is preferably 2.00 or more.

[0063] For the lighting fixture 1, a plurality of these 3 light-emitting devices 10 are arranged, or a plurality of 4 or more light-emitting devices 10 obtained by adding other light-emitting devices to these 3 light-emitting devices are arranged to emit illumination light as a whole.

[0064] The lighting fixture 1 includes a base plate 20, a substrate 30, a light-emitting device 10, a cover 40, and a mounting portion 50. In addition, the lighting fixture 1 is connected to a dimming driver that adjusts the illumination light of the lighting fixture 1. It should be noted that the lighting fixture 1 in which the dimming driver is incorporated is also possible.

[0065] The dimming driver is equipped with a drive program for adjusting the light emitted by the lighting fixture 1. The program is stored in a memory such as the ROM or RAM of the dimming driver and is developed and executed by a processor such as a CPU.

[0066] In the lighting fixture 1, the substrate 30 is mounted on the base plate 20. In addition, a plurality of light-emitting devices 10 are mounted on the substrate 30. The plurality of light-emitting devices 10 are electrically connected by wiring, supplied with power from an external power source, and the light emission of the light-emitting device 10 is controlled.

[0067] In addition, the cover 40 is mounted on the base plate 20 so as to surround the plurality of light-emitting devices 10 arranged on the substrate 30. A mounting portion 50 is provided on the surface (installation surface) on the side opposite to the surface of the base plate 20 on which the light-emitting device 10 is arranged. Through the mounting portion 50, the lighting fixture 1 is mounted on a support. The support is, for example, a ceiling, a wall, or a bracket. In the example of the figure, the mounting portion 50 assumed to be provided on the ceiling is shown.

[0068] In addition, in the lighting fixture 1, as the light-emitting device 10, the first light-emitting device 101, the second light-emitting device 102, and the third light-emitting device 103 are arranged and configured in this order. In Figure 4In the example, a plurality of light-emitting devices 10 are arranged in a matrix, and the first light-emitting device 101, the second light-emitting device 102, and the third light-emitting device 103 are arranged one by one in one column (or one row) in sequence. It should be noted that they can also be alternately arranged in units other than rows or columns. For example, they can also be alternately arranged in units of one light-emitting device or multiple light-emitting devices. The first light-emitting device 101, the second light-emitting device 102, and the third light-emitting device 103 all have a light-emitting element and a phosphor.

[0069] The light-emitting device 10 has a molded body 11, a light-emitting element 12, and a wavelength conversion member 13. The light-emitting element 12 can be a nitride semiconductor having a light-emitting peak in the range of 410 nm or more and 490 nm or less. In addition, the wavelength conversion member 13 can be a phosphor 14 that is excited by the light from the light-emitting element 12 and emits light of a different wavelength. The molded body 11 is a housing that houses the light-emitting element 12 and the wavelength conversion member 13.

[0070] The first light-emitting device 101 and the second light-emitting device 102 contain phosphors with different compositions as the main phosphors. The main phosphor is the phosphor that is contained the most in the wavelength conversion member 13 of the light-emitting device 10. By using light-emitting devices with different main phosphors, compared with light-emitting devices with the same main phosphor, the difference between the MR value at high color temperature and the MR value at low color temperature can be increased.

[0071] It should be noted that the light-emitting element 12 is not limited to a nitride semiconductor. In addition, it can also be a light-emitting element having a light-emitting peak outside the above range. As the light-emitting element, in addition to LEDs, organic ELs, laser diodes, etc. can be used. In addition, the molded body 11 may not be provided.

[0072] Hereinafter, specific examples of the light-emitting devices used as the first light-emitting device 101, the second light-emitting device 102, and the third light-emitting device 103 are given. Figure 6 The emission spectra in the respective examples of the first light-emitting device 101 are shown, Figure 7 The emission spectra in the respective examples of the second light-emitting device 102 are shown, Figure 8 The emission spectra in the respective examples of the third light-emitting device 103 are shown.

[0073] <Example 1 of the first light-emitting device 101>

[0074] For example, the first light-emitting device 101 can use a light-emitting device having a light-emitting element 12 and a wavelength conversion member 13, where the light-emitting element 12 is a nitride semiconductor having a light-emitting peak in the range of 410 nm or more and 470 nm or less, and more preferably in the range of 420 nm or more and 460 nm or less, and the wavelength conversion member 13 contains a compound represented by the formula Sr4Al 14 O25 : The alkaline earth metal aluminate phosphor represented by Eu as the main phosphor has an emission peak at 495 nm. In this first light-emitting device 101, in the chromaticity diagram, the value of x of the first chromaticity coordinate is 0.149, and the value of y is 0.223. In addition, the value of MR is 2.85. In addition, the luminous efficiency is 122 lm / W.

[0075] <Example 2 of the first light-emitting device 101>

[0076] In addition, for example, the first light-emitting device 101 can use a light-emitting device having a light-emitting element 12 and a wavelength conversion member 13. The light-emitting element 12 is a nitride semiconductor having an emission peak in the range of 410 nm or more and 490 nm or less. The wavelength conversion member 13 contains a chlorosilicate phosphor represented by the composition of Ca8Mg(SiO4)4Cl2:Eu as the main phosphor and has an emission peak at 510 nm. In this first light-emitting device 101, in the chromaticity diagram, the value of x of the first chromaticity coordinate is 0.167, and the value of y is 0.246. In addition, the value of MR is 2.07. In addition, the luminous efficiency is 145 lm / W.

[0077] <Example 3 of the first light-emitting device 101>

[0078] In addition, for example, the first light-emitting device 101 can use a light-emitting device having a light-emitting element 12 and a wavelength conversion member 13. The light-emitting element 12 is a nitride semiconductor having an emission peak in the range of 410 nm or more and 470 nm or less. The wavelength conversion member 13 contains a rare earth aluminate phosphor represented by the composition of Lu3(Al,Ga)5O 12 : Ce as the main phosphor and has an emission peak at 496 nm. In this first light-emitting device 101, in the chromaticity diagram, the value of x of the first chromaticity coordinate is 0.191, and the value of y is 0.265. In addition, the value of MR is 1.94. In addition, the luminous efficiency is 148 lm / W.

[0079] <Example 1 of the second light-emitting device 102>

[0080] For example, the second light-emitting device 102 can use a light-emitting device having a light-emitting element 12 and a wavelength conversion member 13. The light-emitting element 12 is a nitride semiconductor having an emission peak in the range of 410 nm or more and 490 nm or less. The wavelength conversion member 13 contains a rare earth aluminate phosphor represented by the composition of Y3Al5O 12 : Ce and a rare earth aluminate phosphor represented by the composition of Lu3Al5O 12: The rare earth aluminate phosphor having a composition represented by Ce, and the silicon nitride phosphor having a composition represented by (Sr,Ca)AlSiN3:Eu as the main phosphor. In the second light-emitting device 102, in the chromaticity diagram, the value of x of the second chromaticity coordinates is 0.539, the value of y is 0.443, the correlated color temperature is 2000K, and the color deviation duv is +0.01. In addition, the value of MR is 0.23. In addition, the luminous efficiency is 168 lm / W.

[0081] <Example 2 of the second light-emitting device 102>

[0082] In addition, for example, the second light-emitting device 102 can use a light-emitting device having a light-emitting element 12 and a wavelength conversion member 13. The light-emitting element 12 is a nitride semiconductor having a light-emitting peak in the range of 410 nm or more and 490 nm or less. The wavelength conversion member 13 contains a rare earth aluminate phosphor having a composition represented by Y3Al5O 12 : Ce, a rare earth aluminate phosphor having a composition represented by Lu3Al5O 12 : Ce, and a silicon nitride phosphor having a composition represented by (Sr,Ca)AlSiN3:Eu as the main phosphor. In the second light-emitting device 102, in the chromaticity diagram, the value of x of the second chromaticity coordinates is 0.505, the value of y is 0.359, the correlated color temperature is 2000K, and the color deviation duv is -0.02. In addition, the value of MR is 0.35. In addition, the luminous efficiency is 144 lm / W.

[0083] <Example 3 of the second light-emitting device 102>

[0084] In addition, for example, the second light-emitting device 102 can use a light-emitting device having a light-emitting element 12 and a wavelength conversion member 13. The light-emitting element 12 is a nitride semiconductor having a light-emitting peak in the range of 410 nm or more and 490 nm or less. The wavelength conversion member 13 contains a rare earth aluminate phosphor having a composition represented by Y3Al5O 12 : Ce, a rare earth aluminate phosphor having a composition represented by Lu3Al5O 12 : Ce, and a silicon nitride phosphor having a composition represented by (Sr,Ca)AlSiN3:Eu as the main phosphor. In the second light-emitting device 102, in the chromaticity diagram, the value of x of the second chromaticity coordinates is 0.524, the value of y is 0.416, the correlated color temperature is 2000K, and the color deviation duv is 0.00. In addition, the value of MR is 0.28. In addition, the luminous efficiency is 131 lm / W.

[0085] <Example 1 of the third light-emitting device 103>

[0086] For example, the third light-emitting device 103 can use a light-emitting device having a light-emitting element 12 and a wavelength conversion member 13. The light-emitting element 12 is a nitride semiconductor having a light-emitting peak in the range of 410 nm or more and 470 nm or less, and more preferably having a light-emitting peak in the range of 420 nm or more and 460 nm or less. The wavelength conversion member 13 contains an alkaline earth metal aluminate phosphor having a composition represented by the formula Sr4Al 14 O 25 :Eu as the main phosphor, having a light-emitting peak at 495 nm. In this third light-emitting device 103, in the chromaticity diagram, the value of x of the third chromaticity coordinate is 0.145, and the value of y is 0.354. In addition, the MR value is 2.32. In addition, the luminous efficiency is 151 lm / W.

[0087] <Example 2 of the third light-emitting device 103>

[0088] In addition, for example, the third light-emitting device 103 can use a light-emitting device having a light-emitting element 12 and a wavelength conversion member 13. The light-emitting element 12 is a nitride semiconductor having a light-emitting peak in the range of 410 nm or more and 490 nm or less. The wavelength conversion member 13 contains a rare earth aluminate phosphor having a composition represented by the formula Y3Al5O 12 :Ce, a rare earth aluminate phosphor having a composition represented by the formula Lu3Al5O 12 :Ce, and a silicon nitride phosphor having a composition represented by the formula (Sr,Ca)AlSiN3:Eu as the main phosphors. In this third light-emitting device 103, in the chromaticity diagram, the value of x of the third chromaticity coordinate is 0.467, the value of y is 0.471, the correlated color temperature is 3000 K, and the color deviation duv is +0.02. In addition, the MR value is 0.38. In addition, the luminous efficiency is 204 lm / W.

[0089] <Example 3 of the third light-emitting device 103>

[0090] In addition, for example, the third light-emitting device 103 can use a light-emitting device having a light-emitting element 12 and a wavelength conversion member 13. The light-emitting element 12 is a nitride semiconductor having a light-emitting peak in the range of 410 nm or more and 490 nm or less. The wavelength conversion member 13 contains a rare earth aluminate phosphor having a composition represented by the formula Y3(Al,Ga)5O 12 :Ce as the main phosphor, having a light-emitting peak at 496 nm. In this third light-emitting device 103, in the chromaticity diagram, the value of x of the third chromaticity coordinate is 0.331, and the value of y is 0.548. In addition, the MR value is 0.76. In addition, the luminous efficiency is 242 lm / W.

[0091] Next, an example of the lighting fixture 1 constituted by the first light-emitting device 101, the second light-emitting device 102, and the third light-emitting device 103 having these examples is given. In addition, the following lighting fixture (hereinafter referred to as the comparative lighting fixture) is used as a comparison object for the lighting fixture 1. It should be noted that the comparative lighting fixture is selected from the viewpoints of the excellence of the luminous efficiency and the high color rendering property required for lighting in the prior art.

[0092] <Comparative Lighting Fixture>

[0093] The comparative lighting fixture is constituted by two light-emitting devices having correlated color temperatures of 2700K and 6500K, respectively, and color deviations of 0.00. In addition, any light-emitting device is also a light-emitting device having a light-emitting element 12 and a wavelength conversion member 13. The light-emitting element 12 is a nitride semiconductor having a light-emitting peak in the range of 410 nm or more and 490 nm or less. The wavelength conversion member 13 contains a rare earth aluminate phosphor having a composition represented by the formula Y3Al5O 12 :Ce, a rare earth aluminate phosphor having a composition represented by the formula Lu3Al5O 12 :Ce, and a silicon nitride phosphor having a composition represented by the formula (Sr,Ca)AlSiN3:Eu. The average color rendering evaluation number (hereinafter, denoted as Ra) is 80 or more, and the luminous efficiency is achieved in the range of 180 lm / W to 200 m / W at the correlated color temperatures of 2700K to 6500K. Details are shown in Table A below.

[0094] [Table A]

[0095]

[0096]

[0097] <Example 1 of Lighting Fixture 1>

[0098] The lighting fixture 1 of Example 1 is constituted by the first light-emitting device 101, the second light-emitting device 102, and the third light-emitting device 103 in each Example 1. The results of the values corresponding to the items in Table A above in the lighting fixture 1 of Example 1 are shown in Table 1 below. In addition, the chromaticity diagram showing the relationship between the first chromaticity coordinates, the second chromaticity coordinates, and the third chromaticity coordinates of the lighting fixture 1 of Example 1, the adjustable color range (triangle connecting three points), and the blackbody radiation locus is shown in Figure 9 .

[0099] [Table 1]

[0100]

[0101] Thus, in the lighting fixture 1 of Example 1, the change amount of MR in the range of the correlated color temperature of 2700K to 6500K is 0.75, which is larger than that of the comparative lighting fixture. In addition, in the range of 3000K to 5000K, the change amount of MR is 0.45, which is larger than that of the comparative lighting fixture. In addition, the MR value at the same color temperature is higher than that of the comparative lighting fixture. It should be noted that here, comparisons are made with the same target color temperature. There is a difference in the actual result color temperature, but this difference is allowed and is referred to as the same color temperature. When light with a correlated color temperature of 5000K is emitted on the blackbody radiation locus (color deviation duv is 0.000), the MR value of the lighting fixture 1 of Example 1 is 1.0 or more. When the light is color - adjusted in the range of 3000K to 5000K of the correlated color temperature on the blackbody radiation locus, the change amount of MR of the lighting fixture 1 of Example 1 is 0.4 or more.

[0102] It should be noted that the luminous efficacy is slightly worse than that of the comparative lighting fixture. However, in any range of 2700K to 6500K and 3000K to 5000K, an average of 160 [lm / W] is achieved in this color - adjustment range, but an average of 170 [lm / W] is not achieved. The color rendering property is at the same level as that of the comparative lighting fixture. Ra achieves an average of 80 in this color - adjustment range, but an average of 85 is not achieved.

[0103] <Example 2 of Lighting Fixture 1>

[0104] The lighting fixture 1 of Example 2 is composed of the first light - emitting device 101 in Example 1, the second light - emitting device 102 in each Example 2, and the third light - emitting device 103. The results of the values of the lighting fixture 1 of Example 2 corresponding to the items in Table A above are shown in Table 2 below. In addition, a chromaticity diagram showing the relationship between the first chromaticity coordinate, the second chromaticity coordinate, and the third chromaticity coordinate of the lighting fixture 1 of Example 2, the color - adjustable range (the triangle connecting the three points), and the blackbody radiation locus is shown in Figure 10 .

[0105] [Table 2]

[0106]

[0107] Thus, in the lighting fixture 1 of Example 2, the change amount of MR in the range of the correlated color temperature of 2700K to 6500K is larger than that of the comparative lighting fixture. Additionally, in the range of 3000K to 5000K, the change amount of MR is also larger than that of the comparative lighting fixture. Moreover, the value of MR at the same color temperature is higher than that of the comparative lighting fixture. When light with a correlated color temperature of 5000K is emitted on the blackbody radiation locus (color deviation duv is 0.000), the MR value of the lighting fixture 1 of Example 2 is 1.0 or more. When the light is color-tuned in the range of 3000K to 5000K of the correlated color temperature on the blackbody radiation locus, the change amount of the MR value of the lighting fixture 1 of Example 2 is 0.4 or more.

[0108] In particular, in the lighting fixture 1 of Example 2, at a low color temperature (the first color temperature), the MR value has little difference from that of the comparative lighting fixture. On the other hand, when it becomes a high color temperature (the second color temperature), the difference expands. It can be said that the lighting fixture 1 of Example 2 is effective for the daily rhythm of being active during the day and calm after evening.

[0109] In addition, the luminous efficacy is worse than that of the comparative lighting fixture but is superior to the lighting fixture 1 of Example 1. In any range of 2700K to 6500K and 3000K to 5000K, an average of 170 [lm / W] is achieved in this color-tuning range, but an average of 180 [lm / W] is not achieved. Moreover, the color rendering property is superior to that of the comparative lighting fixture and the lighting fixture 1 of Example 1. An average Ra of 85 or more is achieved in this color-tuning range, but an average of 90 is not achieved. When the light is dimmed in the range of 3000K to 5000K of the correlated color temperature on the blackbody radiation locus (duv is 0.000), the average color rendering evaluation number of the lighting fixture 1 of Example 2 reaches 85, and the luminous efficacy [lm / W] of the lighting fixture 1 of Example 2 reaches 170.

[0110] <Example of Lighting Fixture 1 - Example 3>

[0111] The lighting fixture 1 of Example 3 is composed of the first light-emitting device 101 in Example 1, the second light-emitting device 102 in each Example 3, and the third light-emitting device 103. The results of the values of the lighting fixture 1 of Example 3 corresponding to the items in Table A above are shown in Table 3 below. Additionally, a chromaticity diagram showing the relationship between the first chromaticity coordinate, the second chromaticity coordinate, and the third chromaticity coordinate of the lighting fixture 1 of Example 3, the color-tunable range (the triangle connecting the three points), and the blackbody radiation locus is shown in Figure 11 .

[0112] [Table 3]

[0113]

[0114] Thus, in the lighting fixture 1 of Example 3, the change amount of MR in the range of the correlated color temperature of 2700K to 6500K is larger than that of the comparative lighting fixture. In addition, in the range of 3000K to 5000K, the change amount of MR is also larger than that of the comparative lighting fixture. In addition, the MR value at the same color temperature is higher than that of the comparative lighting fixture. When light with a correlated color temperature of 5000K is emitted on the blackbody radiation locus (color deviation duv is 0.000), the MR value of the lighting fixture 1 of Example 3 is 1.0 or more. When the light is color - adjusted in the range of 3000K to 5000K of the correlated color temperature on the blackbody radiation locus, the change amount of the MR value of the lighting fixture 1 of Example 3 is 0.4 or more.

[0115] In addition, the luminous efficacy is worse than that of the comparative lighting fixture. In any range of the range of 2700K to 6500K and the range of 3000K to 5000K, an average of 140 [lm / W] is achieved in this color - adjustment range, but an average of 150 [lm / W] is not achieved. On the other hand, the color rendering property is excellent. In particular, in the low - color - temperature range of 4000K or less, Ra reaches 90. Compared with other lighting fixtures 1, the difference in color rendering property becomes larger at the first color temperature and the second color temperature.

[0116] <Example 4 of Lighting Fixture 1>

[0117] The lighting fixture 1 of Example 4 is composed of the first light - emitting device 101, the second light - emitting device 102, and the third light - emitting device 103 in each of Example 2. The results of the values of the lighting fixture 1 of Example 4 corresponding to the items in Table A above are shown in Table 4 below. In addition, the chromaticity diagram showing the relationship between the first chromaticity coordinate, the second chromaticity coordinate, and the third chromaticity coordinate of the lighting fixture 1 of Example 4, the color - adjustable range (triangle connecting the three points), and the blackbody radiation locus is shown in Figure 12 .

[0118] [Table 4]

[0119]

[0120] Thus, in the lighting fixture 1 of Example 4, the change amount of MR in the range of the correlated color temperature of 2700K to 6500K is larger than that of the comparative lighting fixture. In addition, in the range of 3000K to 5000K, the change amount of MR is also larger than that of the comparative lighting fixture. In addition, the MR value at the same color temperature is higher than that of the comparative lighting fixture. When light with a correlated color temperature of 5000K is emitted on the blackbody radiation locus (color deviation duv is 0.000), the MR value of the lighting fixture 1 of Example 4 is less than 1.0. When the light is color - adjusted in the range of 3000K to 5000K of the correlated color temperature on the blackbody radiation locus, the change amount of the MR of the lighting fixture 1 of Example 4 is 0.4 or more.

[0121] The lighting fixture 1 of Example 4 is similar in characteristics to the lighting fixture 1 of Example 2. Similar to the lighting fixture 1 of Example 2, in the case of the lighting fixture 1 of Example 4, at a low color temperature (first color temperature), the MR value has little difference from that of the comparison lighting fixture. On the other hand, when it becomes a high color temperature (second color temperature), the difference expands. However, the increase ratio of the difference at a high color temperature is smaller for the lighting fixture 1 of Example 2. On the other hand, the color rendering property at a high color temperature of 4000K or more is excellent for the lighting fixture 1 of Example 2.

[0122] <Lighting Fixture 1 Example 5>

[0123] The lighting fixture 1 of Example 5 is composed of the first light-emitting device 101 in Example 3, the second light-emitting device 102 in each of Example 2, and the third light-emitting device 103. The results of the values of the lighting fixture 1 of Example 5 corresponding to the items in Table A above are shown in Table 5 below. In addition, the chromaticity diagram showing the relationship between the first chromaticity coordinate, the second chromaticity coordinate, and the third chromaticity coordinate of the lighting fixture 1 of Example 5, the adjustable color range (triangle connecting three points), and the blackbody radiation locus is shown in Figure 13 .

[0124] [Table 5]

[0125]

[0126] Thus, in the lighting fixture 1 of Example 5, the change amount of MR in the range of the correlated color temperature of 2700K to 6500K is larger than that of the comparison lighting fixture. In addition, in the range of 3000K to 5000K, the change amount of MR is also larger than that of the comparison lighting fixture. In addition, the MR value at the same color temperature is higher than that of the comparison lighting fixture. The lighting fixture 1 of Example 5 has substantially the same characteristics as the lighting fixture 1 of Example 4. When light with a correlated color temperature of 5000K is emitted on the blackbody radiation locus (color deviation duv is 0.000), the value of the melanopsin ratio of the lighting fixture 1 of Example 5 is less than 1.0. When the light is color-tuned in the range of 3000K to 5000K of the correlated color temperature on the blackbody radiation locus, the change amount of the value of the melanopsin ratio of the lighting fixture 1 of Example 5 is 0.4 or more.

[0127] As described above, according to the lighting fixture 1 described by way of example, it is possible to provide lighting that can change the MR value while performing color tuning and takes into account the influence on the human body as compared with the prior art.

[0128] The lighting fixtures 1 of Examples 1 to 5 can perform color tuning on the blackbody radiation locus. When the light is color-tuned in the range of 3000K to 5000K of the correlated color temperature, the change amount of the value of the melanopsin ratio reaches at least 0.35. In addition, in a more preferable lighting fixture 1, the change amount of the value of the melanopsin ratio reaches at least 0.40. In addition, in a further preferable lighting fixture 1, the change amount of the value of the melanopsin ratio reaches at least 0.45.

[0129] When the light is color - adjusted in the range of the correlated color temperature of 2700K to 6500K, the change amount of the value of the melanopsin ratio reaches at least 0.6. Additionally, in the more preferable lighting fixture 1, the change amount of the value of the melanopsin ratio reaches at least 0.70. Further, in the further preferable lighting fixture 1, the change amount of the value of the melanopsin ratio reaches at least 0.75.

[0130] In addition, in the preferable lighting fixture 1, the melanopsin ratio at a correlated color temperature of 3000K is 0.5 or less, and the melanopsin ratio at a correlated color temperature of 5000K is 1.0 or more. In the lighting fixture 1 of Example 1 where the maximum value of the melanopsin ratio is achieved, the value of the melanopsin ratio at a correlated color temperature of 6500K reaches 1.3. That is, when the light with a correlated color temperature of 6500K emits light on the black - body radiation locus, the value of the melanopsin ratio of the lighting fixture 1 of Example 1 reaches 1.3.

[0131] In fact, when used as a lighting fixture, not only the value of the simple melanopsin ratio but also the relationship with luminous efficiency is important. When the luminous efficiency is low, by appropriately increasing the input power [W], the luminous flux [lm] can be compensated. However, if in the color - adjustment range, control such as changing the input power according to the color temperature is performed, the device becomes complicated. On this basis, without sacrificing the energy - saving element as much as possible, high user satisfaction can also be given.

[0132] Figure 14 It is a graph comparing the lighting fixture and each of the lighting fixtures 1 of Example 1 to Example 5 by the value obtained by multiplying the MR value and the luminous efficiency. This value represents the relative relationship of the melanopsin ratio in the lighting illuminated by an input power of 1.0 [W]. Hereinafter, it is called the relative melanopsin ratio. It should be noted that for easy comparison, it is a graph based on the comparison lighting fixture.

[0133] As Figure 14 shown, it is significantly seen that the relative melanopsin ratio of the lighting fixture 1 of Example 1 and the lighting fixture 1 of Example 2 is larger than that of the comparison lighting fixture. In addition, the relative melanopsin ratio of the lighting fixture 1 of Example 1 at a low color temperature is good and decreases as the color temperature becomes high. The relative melanopsin ratio of the lighting fixture 1 of Example 2 at a high color temperature is good and increases as the color temperature becomes high.

[0134] When the relative melanopsin ratio is larger at a high color temperature than at a low color temperature, it can be said that the lighting fixture provides lighting that takes more account of the circadian rhythm while considering energy efficiency. It can be said that the lighting fixture 1 of Example 2 has excellent performance as lighting considering the circadian rhythm.

[0135] Next, the color - adjustment control performed using the lighting fixture 1 will be described.

[0136] The lighting fixture 1 can perform color adjustment using at least three light-emitting devices 10. Additionally, the color adjustment range includes temperatures from a first temperature to a second temperature on the blackbody radiation locus. Therefore, compared to color adjustment performed by a comparative lighting fixture composed of two light-emitting devices, color adjustment along the blackbody radiation locus can be performed with good accuracy.

[0137] Construct a dimming control system to achieve such control under color adjustment from a first temperature to a second temperature of the correlated color temperature, that is, the dimming control system has a plurality of lighting fixtures 1, and an information processing device 2 communicably connected to the dimming drivers of each lighting fixture 1 and controlling the dimming drivers to adjust the illumination light of each lighting fixture 1. Figure 15 It is a structural diagram showing an example of the structure of the dimming control system. Note that there may be one lighting fixture 1.

[0138] The information processing device 2 is a computer or a server device, etc., and is a device capable of performing transmission and reception of information via communication and arithmetic processing based on received information or recorded information. The information processing device is equipped with a processor such as a CPU for controlling arithmetic processing, a storage unit such as an HDD for storing programs and information, and a memory such as a ROM or RAM for expanding programs and providing a storage area for executing processing.

[0139] In the dimming control system, the information processing device 2 has a dimming determination unit 3 for determining a control command for the dimming driver in order to adjust the illumination light of the lighting fixture 1. When controlling color adjustment in the range of the correlated color temperature from the first temperature to the second temperature, the dimming determination unit 3 determines the light-emitting ratio of the light-emitting device 10 in the chromaticity diagram so that the illumination light is irradiated at chromaticity coordinates closer to the blackbody radiation locus than the straight line connecting the first temperature and the second temperature on the blackbody radiation locus.

[0140] Additionally, the information processing device 2 has a transmission unit 4 for sending a control command to the dimming driver. The transmission unit 4 sends a control command to the dimming driver so that the light-emitting device 10 emits light at a determined light-emitting ratio. Thereby, the dimming driver can perform dimming based on the control command, and color adjustment along the blackbody radiation locus can be performed with good accuracy.

[0141] At this time, the control range of color adjustment performed by the information processing device 2 is within the region surrounded by the following straight line and the following set of points in the chromaticity diagram. The straight line is the straight line connecting the first temperature and the second temperature on the blackbody radiation locus, and the points are the points located at a distance equal to twice the distance from the points on this straight line between the first temperature and the second temperature to the points on the blackbody radiation locus at the same correlated color temperature as the points. In addition, at least for any correlated color temperature between the first temperature and the second temperature, it is not the outer frame of this region that is incorporated, but the inside of the outer frame. In the chromaticity diagram of the CIE1931 color system, it is preferable that the control range of color adjustment performed by the information processing device 2 is within a color deviation duv of the blackbody radiation locus between the first temperature and the second temperature within ±0.001.

[0142] It should be noted that for color adjustment matching the circadian rhythm, it is preferable to perform color adjustment corresponding to the change in the color temperature of sunlight. However, it is also possible not to precisely match the change in sunlight. For example, consider the following color adjustment: from 0:00 to 6:00 in a day, the MR value becomes the lowest value in a day, and at 6:00 it becomes the maximum value. Then, the maximum value is maintained until 15:30, and the MR value decreases with time between 15:30 and 19:00, and becomes the lowest value after 19:00.

[0143] That is, the information processing device 2 is controlled such that the MR value becomes the maximum at a specified time in the morning. In addition, it is controlled such that the MR value decreases after a certain time from a specified time in the afternoon. It should be noted that it is also possible to increase the MR value after a certain time from a specified time in the morning.

[0144] The MR becomes the maximum when the color temperature is set to the maximum within the color adjustment range. On the other hand, the MR becomes the minimum when the color temperature is set to the minimum within the color adjustment range.

[0145] The embodiments of the present invention have been described above, but the technical idea of the present invention is not limited to the specific embodiments described. For example, in the embodiments, it is not necessary to limit the installation location of the dimming control system of the present invention to an office building.

[0146] In addition, the first light-emitting device 101, the second light-emitting device 102, and the third light-emitting device 103 may be installed on the substrate 30 as physically separate light-emitting devices 10, or any plurality of light-emitting devices may be integrally formed and installed.

[0147] Figures 16A to 16CSeveral examples of the light-emitting device 10 implemented in an embodiment in which a plurality of light-emitting devices 100 are integrally formed. It should be noted that the plurality of integrally formed light-emitting devices 100 include two or more light-emitting devices selected from the first light-emitting device 101, the second light-emitting device 102, and the third light-emitting device 103.

[0148] Figure 16A An embodiment of the light-emitting device 10 in which two chambers are formed by one molded body 11, and the light-emitting elements 12 and wavelength conversion members 13 of one light-emitting device 100 among the plurality of light-emitting devices 100 and the light-emitting elements 12 and wavelength conversion members 13 of the other light-emitting devices 100 are arranged in the respective chambers.

[0149] Figure 16B An embodiment of the light-emitting device 10 in which one chamber is formed by one molded body 11, and the light-emitting elements 12 and wavelength conversion members 13 of one light-emitting device 100 among the plurality of light-emitting devices 100 and the light-emitting elements 12 and wavelength conversion members 13 of the other light-emitting devices 100 are arranged in the chamber.

[0150] In addition, the wavelength conversion member 13 for the light emission by one light-emitting device 100 (one of the two illustrated light-emitting devices 100), that is, the wavelength conversion member 13 that is not required for the light emission by the other light-emitting devices 100 (the other of the two illustrated light-emitting devices 100) is provided only around the light-emitting element 12 of one light-emitting device 100. Similarly, the wavelength conversion member 13 for the light emission by the other light-emitting devices 100, that is, the wavelength conversion member 13 that is not required for the light emission by one light-emitting device 100, is provided only around the light-emitting element 12 of the other light-emitting devices 100. The wavelength conversion member 13 that is required for the light emission by both one light-emitting device 100 and the other light-emitting devices 100 is also provided so as to cover any light-emitting device 100.

[0151] Figure 16C An embodiment of the light-emitting device 10 in which one chamber is formed by one molded body 11, and the light-emitting elements 12 and wavelength conversion members 13 of one light-emitting device 100 and the light-emitting elements 12 and wavelength conversion members 13 of the other light-emitting devices 100 are arranged in the chamber.

[0152] In addition, compared with Figure 16B There is no wavelength conversion member 13 for the light emission by one light-emitting device 100, that is, the wavelength conversion member 13 that is not required for the light emission by the other light-emitting devices 100. On the other hand, the wavelength conversion member 13 for the light emission by the other light-emitting devices 100, that is, the wavelength conversion member 13 that is not required for the light emission by one light-emitting device 100, is provided only around the light-emitting element 12 of the other light-emitting devices 100.

[0153] In addition, the wavelength conversion member 13 disposed only around the light-emitting element 12 of the other light-emitting device 100 is composed of multiple layers. It should be noted that it may also be a single layer. In each layer, the phosphor is disposed offset on the lower surface. For example, by attaching a sheet-shaped phosphor to a glass material, such a wavelength conversion member 13 can be formed.

[0154] In addition, the side surface of the light-emitting element 12 of the other light-emitting device 100 is covered by the reflection layer 15. Thus, the light from the light-emitting element 12 of one light-emitting device 100 is reflected by the reflection layer 15 before entering the light-emitting element 12 of the other light-emitting device 100. Therefore, it is possible to suppress the light from the light-emitting element 12 of one light-emitting device 100 from being wavelength-converted by the wavelength conversion member 13 disposed only around the light-emitting element 12 of the other light-emitting device 100.

[0155] In this way, according to the light-emitting device 10 in which a plurality of light-emitting devices 100 are integrally formed, it is possible to provide a light-emitting device 10 having a first light-emitting device 101, a second light-emitting device 102, and a third light-emitting device 103 and processed by an integrated single encapsulation. In addition, by controlling the light emission of such a light-emitting device 10 as described above, a dimming control system can be realized.

[0156] In addition, the present invention can be applied even if it is not necessary to fully include all the structural elements disclosed in each embodiment. In the field of those skilled in the art or the technical field to which the invention belongs, as long as it is within the scope of the design freedom, the present invention can be applied even if a part of the structural elements disclosed in the embodiments is not described in the claims. This specification discloses the invention on the premise of including the above.

[0157] Industrial Applicability

[0158] The dimming control system or lighting fixture described in each embodiment can be used in the field of lighting installed in an indoor space or the like.

[0159] Description of Reference Numerals

[0160] 1 Lighting fixture

[0161] 10 Light-emitting device

[0162] 101 First light-emitting device

[0163] 102 Second light-emitting device

[0164] 103 Third light-emitting device

[0165] 11 Formed body

[0166] 12 Light-emitting element

[0167] 13 Wavelength conversion component

[0168] 14 Phosphor

[0169] 15 Reflective layer

[0170] 20 Substrate board

[0171] 30 Substrate

[0172] 40 Cover

[0173] 50 Mounting part

[0174] 2 Information processing device

[0175] 3 Dimming determination unit

[0176] 4 Transmitting unit

Claims

1. A lighting fixture that controls color mixing within a range of correlated color temperatures from a first temperature to a second temperature that is more than 2000K greater than the first temperature, wherein, comprising: a first light-emitting device that emits light having a luminous color with first chromaticity coordinates whose x and y values in the chromaticity diagram of the CIE1931 color system are below the x and y values at the second temperature on the blackbody radiation locus; a second light-emitting device that emits light having a luminous color with second chromaticity coordinates whose x value in the chromaticity diagram of the CIE1931 color system is above the x value at the first temperature on the blackbody radiation locus; a third light-emitting device that emits light having a luminous color with third chromaticity coordinates whose x value is a first value and y value is a second value in the chromaticity diagram of the CIE1931 color system, wherein when a straight line passing through the first temperature and the second temperature on the blackbody radiation locus is represented by a function of x and y, the second value is greater than the y value when the first value is substituted for x in the function; in the chromaticity diagram of the CIE1931 color system, light in the range from the first temperature to the second temperature on the blackbody radiation locus is included in the region of a triangle surrounded by a straight line connecting the first chromaticity coordinates and the second chromaticity coordinates, a straight line connecting the second chromaticity coordinates and the third chromaticity coordinates, and a straight line connecting the third chromaticity coordinates and the first chromaticity coordinates; in controlling color mixing from the first temperature to the second temperature, at least the first light-emitting device, the second light-emitting device, and the third light-emitting device are used; when light with a correlated color temperature of 5000K is emitted on the blackbody radiation locus, the value of the melanopsin ratio becomes 1.0 or more; when light is color-mixed in the range of a correlated color temperature of 3000K to 5000K on the blackbody radiation locus, the change amount of the value of the melanopsin ratio is 0.4 or more; in the chromaticity diagram of the CIE1931 color system, the x value of the first chromaticity coordinates is 0.1 or more and 0.2 or less, and the y value is 0.2 or more and 0.3 or less; the value of the melanopsin ratio of the first light-emitting device is 2.0 or more; in the chromaticity diagram of the CIE1931 color system, the y value of the second chromaticity coordinates is below the y value at the first temperature on the blackbody radiation locus, and the x value is 0.45 or more and 0.6 or less; the value of the melanopsin ratio of the second light-emitting device is 0.4 or less; in the chromaticity diagram of the CIE1931 color system, the x value in the chromaticity coordinates of the third chromaticity coordinates is 0.4 or more and 0.5 or less; the value of the melanopsin ratio of the third light-emitting device is 0.5 or less.

2. The lighting fixture according to claim 1, wherein the x value of the first chromaticity coordinates is 0.1 or more smaller than the x value at the second temperature on the blackbody radiation locus.

3. The lighting fixture according to claim 1 or 2, wherein when light is color-mixed in the range of a correlated color temperature of 3000K to 5000K on the blackbody radiation locus, the average color rendering index reaches 85 and the luminous efficacy [lm / W] reaches 170.

4. The lighting fixture according to claim 1 or 2, wherein The first light-emitting device, the second light-emitting device, and the third light-emitting device each have a light-emitting element and a phosphor.

5. The lighting fixture according to claim 1 or 2, wherein The first light-emitting device has an alkaline earth metal aluminate phosphor containing a composition represented by Sr4Al 14 O 25 :Eu as a main phosphor.

6. A dimming control system having: One or more lighting fixtures according to any one of claims 1 to 5, and an information processing device communicably connected to a dimming driver of the lighting fixture and adjusting illumination light of the lighting fixture within a range from a first temperature to a second temperature of a correlated color temperature, wherein The information processing device has: A dimming determination unit that determines a control command for the dimming driver in order to control the dimming driver to adjust the illumination light of the lighting fixture; A transmission unit that transmits the control command determined by the dimming determination unit to the dimming driver; The control range of color adjustment performed by the information processing device is within a region surrounded by a set of points located at a distance twice the distance from a point on a straight line connecting the first temperature and the second temperature on a blackbody radiation locus to a point on the blackbody radiation locus at the same correlated color temperature as that point, in a chromaticity diagram of the CIE1931 colorimetric system, and at least for any correlated color temperature between the first temperature and the second temperature, the control range is not included in the outer frame of the region but is included inside the outer frame.

7. A dimming control system having: One or more lighting fixtures according to any one of claims 1 to 5, and an information processing device communicably connected to a dimming driver of the lighting fixture and adjusting illumination light of the lighting fixture within a range from a first temperature to a second temperature of a correlated color temperature, wherein The information processing device has: A dimming determination unit that determines a control command for the dimming driver in order to control the dimming driver to adjust the illumination light of the lighting fixture; A transmission unit that transmits the control command determined by the dimming determination unit to the dimming driver; The control range of color adjustment of the information processing device between the first temperature and the second temperature is within a color deviation of ±0.001 or less in a chromaticity diagram of the CIE1931 colorimetric system.

Images