Lighting device, lighting fixture, lighting lamp, and lighting system

Abstract

A lighting device (40) is provided with a plurality of LED packages (42) that emit two or more types of light having different chromaticity values. In the lighting device (40), if a first high region and a first low region that is lower than the first high region are set for a first luminous intensity distribution derived on the basis of the spectral luminous efficiency in a wavelength region of 360 nm or more and less than 555 nm and the slope of the spectral luminous efficiency in the wavelength region of 360 nm or more and less than 555 nm, and a second high region and a second low region that is lower than the second high region are set for a second luminous intensity distribution derived on the basis of the spectral luminous efficiency in a wavelength region of 555 nm to 830 nm inclusive and the slope of the spectral luminous efficiency in the wavelength region of 555 nm to 830 nm inclusive, the peak wavelength of the emitted light or the dominant wavelength of the emitted light is included in the first low region and the second low region in each of the plurality of LED packages (42).

Description

Lighting device, lighting fixture, lighting lamp and lighting system

[0001] The present invention relates to a lighting device, a lighting fixture, a lighting lamp, and a lighting system.

[0002] Conventionally, techniques for adjusting the chromaticity of output light from a lighting device have been proposed (see, for example, Patent Document 1).

[0003] JP 2009-123429 A

[0004] However, in conventional technologies, when dimming each LED (Light Emitting Diode) package of a lighting device, the junction temperature of each LED package changes depending on the increase or decrease in the current supplied to the LED package. However, this change in junction temperature shifts the peak wavelength in the spectrum of light emitted by the LED package, which can result in a large difference in the fluctuation of total luminous flux between the LED packages. In this case, there is a problem that the chromaticity of the light emitted during dimming may deviate significantly from its original value.

[0005] Therefore, the present disclosure provides a lighting device and the like that can suppress chromaticity differences during dimming.

[0006] An illumination device according to one aspect of the present disclosure is an illumination device including a plurality of LED (Light Emitting Diode) packages that emit two or more types of light with different chromaticity values, wherein a first luminous intensity distribution is derived based on the spectral luminous efficiency in a wavelength range of 360 nm to less than 555 nm and the slope of the spectral luminous efficiency in the wavelength range of 360 nm to less than 555 nm, and a first high region and a first low region lower than the first high region are set for the first luminous intensity distribution; and a second high region and a second low region lower than the second high region are set for a second luminous intensity distribution is derived based on the spectral luminous efficiency in a wavelength range of 555 nm to less than 830 nm and the slope of the spectral luminous efficiency in the wavelength range of 555 nm to less than 830 nm, and when the peak wavelength or the dominant wavelength of the emitted light of each of the plurality of LED packages is included in the first low region and the second low region,

[0007] Furthermore, an illumination device according to one aspect of the present disclosure is an illumination device equipped with a plurality of LED packages that emit two or more types of light with different chromaticity values, wherein the peak wavelength or dominant wavelength of the emitted light of each of the plurality of LED packages is included in any of the ranges of 360 nm or more and 504 nm or less, 539 nm or more and 566 nm or less, and 620 nm or more and 830 nm or less.

[0008] Furthermore, an illumination device according to an aspect of the present disclosure is an illumination device including a plurality of LED elements that emit two or more types of light having different chromaticity values, wherein a first high region and a first low region lower than the first high region are set for a first luminous intensity distribution derived based on the spectral luminous efficiency in a wavelength range of 360 nm or more and less than 555 nm and the slope of the spectral luminous efficiency in the wavelength range of 360 nm or more and less than 555 nm, and a second high region and a second low region lower than the second high region are set for a second luminous intensity distribution derived based on the spectral luminous efficiency in a wavelength range of 555 nm or more and less than 830 nm and the slope of the spectral luminous efficiency in the wavelength range of 555 nm or more and less than 830 nm, and wherein a peak wavelength of light emitted by each of the plurality of LED packages or a dominant wavelength of light emitted by each of the plurality of LED packages is The characteristics of each of the plurality of LED packages emitting light included in the first high region and the second high region are such that the peak wavelength for the current supplied to each of the plurality of LED packages or the dominant wavelength for the current slopes downward to the right, and the peak wavelength for the junction temperature of each of the plurality of LED packages or the dominant wavelength for the junction temperature slopes upward to the right, or the peak wavelength for the current or the dominant wavelength for the current is constant, and the peak wavelength for the junction temperature or the dominant wavelength for the junction temperature is constant.

[0009] Furthermore, an illumination device according to one aspect of the present disclosure is an illumination device including a plurality of LED elements that emit two or more types of light with different chromaticity values, wherein the peak wavelength or dominant wavelength of the emitted light of each of the plurality of LED packages is located outside the ranges of 360 nm to 504 nm, 539 nm to 566 nm, and 620 nm to 830 nm, and wherein the characteristics of each of the plurality of LED packages are such that the peak wavelength or the dominant wavelength for the current supplied to each of the plurality of LED packages decreases to the right, and the peak wavelength or the dominant wavelength for the junction temperature of each of the plurality of LED packages increases to the right, or the peak wavelength for the current or the dominant wavelength for the current is constant, and the peak wavelength for the junction temperature or the dominant wavelength for the junction temperature is constant.

[0010] Furthermore, a lighting fixture according to one aspect of the present disclosure includes a lighting device and a power supply device that supplies power to each of the plurality of LED packages.

[0011] An illumination lamp according to an aspect of the present disclosure includes an illumination device.

[0012] Also, a lighting system according to one aspect of the present disclosure includes a lighting device, a power supply device that supplies power to the lighting device, a control device that controls the lighting device, and a communication device that performs communication related to the control of the lighting device.

[0013] According to the present disclosure, a lighting device and the like that can suppress chromaticity difference during dimming is provided.

[0014] FIG. 1A is a block diagram showing an illumination system according to an embodiment. FIG. 1B is a diagram showing an LED package. FIG. 2 is a diagram showing x,y chromaticity coordinates defined in JIS Z 8110-1995. FIG. 3 is a diagram showing a relative luminous efficiency curve for human photopic vision, a first luminous intensity distribution, and a second luminous intensity distribution. FIG. 4 is a diagram showing coefficients of a quartic function and coefficients obtained when the quartic function is differentiated. FIG. 5A is a diagram showing a current characteristic that slopes downward and a junction temperature characteristic that slopes upward. FIG. 5B is a diagram showing a constant current characteristic and a constant junction temperature characteristic.

[0015] Hereinafter, the embodiments will be described in detail with reference to the drawings. Note that the embodiments described below are all comprehensive or specific examples. The numerical values, shapes, materials, components, component placement and connection forms, steps, step order, etc. shown in the following embodiments are merely examples and are not intended to limit the present disclosure. Furthermore, among the components in the following embodiments, components not recited in independent claims will be described as optional components.

[0016] It should be noted that the drawings are schematic diagrams and are not necessarily strict illustrations. In addition, in the drawings, substantially the same components are denoted by the same reference numerals, and overlapping descriptions may be omitted or simplified.

[0017] (Embodiment) [Configuration] First, a lighting device 40, a lighting fixture 5, an illumination lamp, and a lighting system 1 according to an embodiment will be described with reference to FIGS. 1A and 1B.

[0018] Fig. 1A is a block diagram showing a lighting system 1 according to an embodiment, and Fig. 1B is a diagram showing an LED package.

[0019] The lighting system 1 is a system that can make the lighting device 40 emit light at a chromaticity desired by a user by independently adjusting the dimming of two or more types of LED packages 42 with different chromaticity values ​​provided in the lighting device 40. The lighting system 1 is a system that supports the chromaticity adjustment function of the lighting device 40.

[0020] The lighting system 1 includes an input device 20, a communication device 10, a control device 30, a lighting device 40, and a power supply device 50. Note that the lighting system 1 may include a plurality of lighting devices 40 for one control device 30. The communication device 10, the control device 30, the lighting device 40, and the power supply device 50 may constitute a lighting fixture 5.

[0021] Input device 20 receives input from a user regarding the control of lighting device 40. The input regarding the control of lighting device 40 is an input for specifying the chromaticity of light emitted by lighting device 40. Input device 20 transmits the received input regarding the control of lighting device 40 to communication device 10 of lighting fixture 5 as a control signal.

[0022] The input device 20 is, for example, a portable information terminal such as a smartphone or a tablet terminal, but may also be a stationary information terminal that is fixedly installed on a wall, etc. The input device 20 may be realized by installing an application program corresponding to the lighting system 1 in a general-purpose device, or may be a device dedicated to the lighting system 1.

[0023] The communication device 10 receives a control signal via wireless communication from an input device external to the lighting device 40. More specifically, the communication device 10 receives a control signal from the input device (remote controller) via an antenna. The communication device 10 may have a built-in antenna. The frequency band of the wireless communication performed by the communication device 10 is the UHF (Ultra High Frequency) band or the SHF (Super High Frequency) band, but the frequency band of the wireless communication performed by the communication device 10 may be another frequency band.

[0024] The control device 30 controls the lighting device 40 to emit light at a chromaticity input to the input device 20 (input related to the control of the lighting device 40) indicated by the control signal acquired by the communication device 10. The control device 30 includes a control unit 31 and a storage unit 32. The input device 20 and the control device 30 may be realized as a single integrated device.

[0025] The control unit 31 controls the 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 sending a control signal to the lighting device 40. The control unit 31 is realized by, for example, a microcomputer, but may also be realized by a processor. The functions of the control unit 31 are realized by the microcomputer or processor constituting the control unit 31 executing a computer program stored in the storage unit 32.

[0026] The storage unit 32 is a storage device that stores the computer program executed by the control unit 31 and various information required to control the lighting device 40. Specifically, the storage unit 32 is realized by a semiconductor memory or the like.

[0027] The lighting device 40 is installed, for example, indoors and illuminates the indoor space. The lighting device 40 may be, for example, an LED module.

[0028] As shown in FIG. 1B, the lighting device 40 includes a substrate 44 and a plurality of LED packages 42 mounted on the substrate 44 .

[0029] The substrate 44 is a mounting substrate for mounting the plurality of LED packages 42. The substrate 44 is, for example, a printed wiring board (printed circuit board) on which metal wiring is formed in a predetermined pattern. A resist made of an insulating resin material may be formed on the surface of the substrate 44 to cover the wiring and protect the wiring and ensure a dielectric strength voltage. The substrate 44 may be a single-sided wiring board in which wiring is formed only on the main surface on which the plurality of LED packages 42 are mounted, or a double-sided wiring board in which wiring is formed on both sides. The substrate 44 may also be a rigid substrate or a film-like flexible substrate.

[0030] The LED packages 42 are mounted at predetermined intervals on the main surface of the substrate 44. Note that Fig. 1B shows one LED package 42 as an example.

[0031] Specifically, the plurality of LED packages 42 emit light when a direct current is supplied from the power supply device 50 via an electric wire connecting the power supply device 50 and the substrate 44 .

[0032] Each of the plurality of LED packages 42 is an individually packaged surface mount device (SMD) structure or chip on board (COB) structure.

[0033] Each of the LED packages 42 includes a white resin or ceramic container (package), an LED element 42 a (bare chip) disposed in the container, and a sealing member 42 b that seals the LED element 42 a. The sealing member 42 b contains a phosphor 42 c.

[0034] Furthermore, the lighting device 40 may be a ceiling light having multiple LED packages 42, a spotlight having multiple LED packages 42, a downlight having multiple LED packages 42, or an illumination lamp (light bulb) having multiple LED packages 42.

[0035] The lighting device 40 includes a dimming circuit 41 in addition to a plurality of LED packages 42 .

[0036] The dimming circuit 41 is a circuit that supplies current (power) to the multiple LED packages 42 in response 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 multiple LED packages 42 by switching a switching element included in the dimming circuit 41 (chopper control circuit) using the control signal. The dimming circuit 41 can supply current to each of the multiple LED packages 42 independently. In other words, the dimming circuit 41 can independently dim the multiple LED packages 42.

[0037] The plurality of LED packages 42 are at least two of a purple light source, a blue-violet light source, a blue light source, a blue-green light source, a green light source, a yellow-green light source, a yellow light source, a yellow-red light source, a red light source, and a red-violet light source.

[0038] The purple light source is a light source that emits purple light. The purple light source emits purple light (specifically, at least purple light and may further include blue light) with an emission peak wavelength of 380 nm or more and 430 nm or less. Specifically, the purple light source is a light-emitting module using a purple LED, but the specific form of the purple light source is not particularly limited.

[0039] The blue-violet light source is a light source that emits blue-violet light. The blue-violet light source emits blue-violet light (specifically, including blue-violet light, and may further include at least one of blue light and purple light) with an emission peak wavelength of 400 nm or more and 450 nm or less. The blue-violet light source is specifically a light-emitting module using a blue-violet LED, but the specific form of the blue-violet light source is not particularly limited.

[0040] The blue light source is a light source that emits blue light. The blue light source emits blue light (specifically, at least blue light and may further include purple light) with an emission peak wavelength of, for example, about 380 nm or more and about 480 nm or less. Specifically, the blue light source is a light-emitting module using a blue LED, but the specific form of the blue light source is not particularly limited.

[0041] The blue-green light source is a light source that emits blue-green light (blue-green is sometimes expressed as emerald green, etc.). The blue-green light source emits, for example, blue-green light (specifically, including blue-green light, and may further include at least one of blue light and green light) having an emission peak wavelength of about 465 nm or more and about 490 nm or less. Specifically, the blue-green light source is a light-emitting module that uses a blue-green LED, but the specific form of the blue-green light source is not particularly limited.

[0042] The green light source is a light source that emits green light. The green light source emits, for example, green light having an emission peak wavelength of about 480 nm or more and about 580 nm or less (specifically, at least green light is included, and it may further include at least one of green-blue light, blue-green light, and yellow-green light). The green light source is specifically a light-emitting module using a green LED, but the specific form of the green light source is not particularly limited.

[0043] The yellow-green light source is a light source that emits yellow-green light. The yellow-green light source emits, for example, yellow-green light having an emission peak wavelength of about 560 nm or more and about 580 nm or less (specifically, including at least yellow-green light, and may further include at least one of yellow light and green light). The yellow-green light source is specifically a light-emitting module using a yellow-green LED, but the specific form of the yellow-green light source is not particularly limited.

[0044] The yellow light source is a light source that emits yellow light. The yellow light source emits yellow light (specifically, at least yellow light, and may further include at least one of yellow-green light and yellow-red light) with an emission peak wavelength of, for example, about 580 nm or more and about 595 nm or less. The yellow light source is specifically a light-emitting module using a yellow LED, but the specific form of the yellow light source is not particularly limited.

[0045] The yellow-red light source is a light source that emits yellow-red light. The yellow-red light source emits, for example, yellow-red light having an emission peak wavelength of about 595 nm or more and about 610 nm or less (specifically, including at least yellow-red light, and may further include at least one of yellow light and red light). The yellow-red light source is specifically a light-emitting module using a yellow-red LED, but the specific form of the yellow-red light source is not particularly limited.

[0046] The red light source is a light source that emits red light. The red light source emits red light (specifically, at least red light and may further include yellow light) with an emission peak wavelength of about 610 nm or more and about 750 nm or less. Specifically, the red light source is a light-emitting module using a red LED, but the specific form of the red light source is not particularly limited.

[0047] The red-violet light source is a light source that emits red-violet light. The red-violet light source emits red-violet light (specifically, at least red-violet light and may further include red light) with an emission peak wavelength of about 750 nm or more and about 830 nm or less. The red-violet light source is specifically a light-emitting module using a red-violet LED, but the specific form of the red-violet light source is not particularly limited.

[0048] Here, the green light emitted by the green light source, the red light emitted by the red light source, and the yellow light emitted by the yellow light source may be realized by fluorescence emitted by the phosphor 42c. In this case, each of the green light source, the red light source, and the yellow light source includes an excitation light source realized by, for example, a blue LED or the like, and a phosphor-containing resin that seals the excitation light source. The phosphor 42c constituting the green light source is Y ３ (Al, Ga) ５ O １２ : Ce phosphor or other yttrium aluminum garnet (YAG) green phosphors, but Lu ３ Al ５ O １２ The phosphor 42c constituting the red light source may be a green phosphor of the lutetium aluminum garnet (LuAG) system, such as CaAlSiN. ３ : Eu phosphor or (Sr,Ca)AlSiN ３ The phosphor 42c constituting the yellow light source is a red phosphor such as Eu phosphor. ３ (Al, Ga) ５ O １２ : Ce phosphors and other yttrium aluminum garnet (YAG)-based yellow phosphors, but Lu ３ Al ５ O １２ The phosphor may be a lutetium aluminum garnet (LuAG)-based yellow phosphor, such as a :Ce phosphor.

[0049] Furthermore, the purple light source, blue-violet light source, blue-green light source, yellow-green light source, yellow-red light source, and red-violet light source may be realized by combining these light sources, combining LED elements 42a that emit blue light, green light, and red light, or selectively combining among them.

[0050] The power supply device 50 supplies power (current) to the plurality of LED packages 42 to cause the plurality of LED packages 42 to emit light based on a control signal output from the control device 30. The power supply device 50 converts AC power to DC power, and then converts the converted DC power into DC power suitable for driving the control device 30 and the lighting circuit, and outputs the converted DC power. More specifically, the power supply device 50 is configured, for example, with a lighting circuit, a diode bridge rectifier circuit that converts AC power to DC power, and a DC-DC converter IC. Note that the power supply device 50 may also be realized by a single IC having equivalent functions to the rectifier circuit and the DC-DC converter. The lighting circuit is, specifically, an LED driver IC.

[0051] The power supply device 50 is a component of the lighting fixture 5 and the lighting system 1, but is not a component of the lighting lamp.

[0052] [Chromaticity] First, the chromaticity of the light emitted from each of the plurality of LED packages 42 will be described with reference to FIG.

[0053] 2 is a diagram showing x, y chromaticity coordinates defined in JIS Z 8110-1995. The chromaticity coordinates in FIG. 2 show the color space defined in CIE1931.

[0054] In this lighting system 1, the chromaticity of the light emitted by the lighting device 40 can be adjusted by selectively activating at least two of the purple light source, blue-violet light source, blue light source, blue-green light source, green light source, yellow-green light source, yellow light source, yellow-red light source, red light source, and red-violet light source contained in the multiple LED packages 42.

[0055] The light emitted by lighting device 40 refers to output light that is a combination of at least two of the following: purple light emitted from a purple light source, blue-purple light emitted from a blue-purple light source, blue light emitted from a blue-green light source, blue light emitted from a blue-green light source, green light emitted from a green light source, yellow-green light emitted from a yellow-green light source, yellow light emitted from a yellow light source, yellow-red light emitted from a yellow-red light source, red light emitted from a red light source, and red-purple light emitted from a red-purple light source, and refers to the output light that is finally emitted from lighting device 40.

[0056] The chromaticity values ​​of the light emitted by each of the plurality of LED packages 42 are the coordinate values ​​of at least two of the dotted hatched areas of purple, blue-purple, blue, blue-green, green, yellow-green, yellow, yellow-red, red, and red-purple shown in the x, y chromaticity coordinates defined in JIS Z 8110-1995 shown in FIG. 2 .

[0057] Here, the light emitted by each of the multiple LED packages 42 has a characteristic that, when its chromaticity value is within the hatched area of ​​dots shown in Fig. 2, it does not have a broad emission spectrum but has an emission spectrum with a steep peak value at a specific wavelength. Therefore, when the peak wavelength of the emitted light shifts due to a change in the junction temperature of the LED package 42, chromaticity differences tend to occur.

[0058] An example of chromaticity adjustment will now be described in detail with reference to FIG.

[0059] 3A and 3B are diagrams showing a relative luminous efficiency curve, a first luminous intensity distribution, and a second luminous intensity distribution for human photopic vision. In Fig. 3A, the solid line is a graph showing the spectral luminous efficiency for photopic vision (relative luminous efficiency curve), and the dashed line is a graph showing the product of the spectral luminous efficiency for photopic vision and the slope of the spectral luminous efficiency. In Fig. 3B, the dashed line first luminous intensity distribution and the dashed line second luminous intensity distribution are converted into relative values ​​with the peak value as the standard.

[0060] In order to adjust the chromaticity of the light emitted by the lighting device 40, the distribution indicated by the dashed line in FIG. 3A was derived by using the relative luminous efficiency curve for human photopic vision.

[0061] Specifically, the first luminous intensity distribution was derived based on the spectral luminous efficiency in the wavelength range of 360 nm to less than 555 nm and the slope of the spectral luminous efficiency in the wavelength range of 360 nm to less than 555 nm in the relative luminous efficiency curve of Figure 3. That is, the first luminous intensity distribution was derived as the product of the spectral luminous efficiency in the wavelength range of 360 nm to less than 555 nm and the slope of the spectral luminous efficiency in the wavelength range of 360 nm to less than 555 nm. A first high region and a first low region lower than the first high region were set for the derived first luminous intensity distribution. The slope of the spectral luminous efficiency is the slope of the tangent to the relative luminous efficiency curve in the wavelength range of 360 nm to less than 555 nm.

[0062] Furthermore, a second luminous intensity distribution was derived based on the spectral luminous efficiency in the wavelength range of 555 nm to 830 nm and the slope of the spectral luminous efficiency in the wavelength range of 555 nm to 830 nm. That is, the second luminous intensity distribution was derived as the product of the spectral luminous efficiency in the wavelength range of 555 nm to 830 nm and the slope of the spectral luminous efficiency in the wavelength range of 555 nm to 830 nm. A second high region and a second low region lower than the second high region were set for the derived second luminous intensity distribution. The slope of this spectral luminous efficiency is the slope of the tangent to the relative luminous efficiency curve in the wavelength range of 555 nm to 830 nm.

[0063] For example, since the spectral luminous efficiency of the peak wavelength in the first luminous intensity distribution is approximately 1.1, the first luminous intensity distribution may be divided into a first low region and a first high region, with the first low region being a wavelength region of 360 nm or more and less than 555 nm and having a value of 0 or more and less than 0.55, and the first high region being a wavelength region of 360 nm or more and less than 555 nm and having a value of 0.55 or more and less than 1.1. Note that the above-mentioned 0.55 is merely an example of a reference value, and therefore a value higher or lower than 0.55 may be set as the reference value.

[0064] Furthermore, since the spectral luminous efficiency of the peak wavelength in the second luminous intensity distribution is approximately 0.7, it is also possible to divide it into a second low region and a second high region, with the second low region being a wavelength region of 555 nm to 830 nm and being equal to or greater than 0 and less than 0.35, and the second high region being a wavelength region of 555 nm to 830 nm and being equal to or greater than 0.35 and being equal to or less than 0.7. Note that 0.35 is merely an example of a reference value, and therefore a value higher or lower than 0.35 may be set as the reference value.

[0065] As shown by the dashed line in (a) of Figure 3, the derived first luminous intensity distribution and the derived second luminous intensity distribution have different peak values. Therefore, in this embodiment, as shown in (b) of Figure 3, the first luminous intensity distribution and the second luminous intensity distribution may be further converted into relative values ​​with the peak value as the standard. When converting into relative values ​​with the peak value as the standard, for example, the first low region may be converted into a wavelength region of 360 nm or more and less than 555 nm, which corresponds to 0 or more and less than 0.5 when the peak value of the first luminous intensity distribution is 1. The second low region may be converted into a wavelength region of 555 nm or more and less than 830 nm, which corresponds to 0 or more and less than 0.5 when the peak value of the second luminous intensity distribution is 1. The first high region may be converted into a wavelength region of 360 nm or more and less than 555 nm, which corresponds to 0.5 or more and less than 1 when the peak value of the first luminous intensity distribution is 1. The second high region may be a wavelength region of 555 nm or more and 830 nm or less, and may be converted to a region equivalent to 0.5 or more and 1 or less when the peak value of the second luminous intensity distribution is 1. Note that 0.5 is merely an example of a reference value, and therefore a numerical value higher or lower than 0.5 may be set as the reference value.

[0066] Here, the first low region and the second low region are regions where the total luminous flux is less likely to change even if the chromaticity deviates from the original chromaticity when the LED package 42 emits light, and where it is less likely that a person will perceive a change in chromaticity of the light emitted from the LED package 42. The first high region and the second high region are regions where the total luminous flux is more likely to change than the first low region and the second low region when the chromaticity deviates from the original chromaticity when the LED package 42 emits light, and where it is more likely that a person will perceive a change in chromaticity of the light emitted from the LED package 42. Note that the first high region and the second high region do not overlap with the first low region and the second low region.

[0067] Therefore, each of the plurality of LED packages 42 has a characteristic that the peak wavelength or the dominant wavelength of the emitted light is included in the first low region or the second low region. Due to such a characteristic, even if the junction temperature of the LED package 42 changes, the effect on the human eye can be reduced.

[0068] 3A, the first low wavelength region corresponds to the wavelength range of light from 360 nm to 504 nm and from 539 nm to less than 555 nm. The second low wavelength region corresponds to the wavelength range of light from 555 nm to 566 nm and from 620 nm to 830 nm. Therefore, each of the multiple LED packages 42 may have a characteristic in which the peak wavelength or dominant wavelength of the emitted light falls within any of the ranges of 360 nm to 504 nm, 539 nm to 566 nm, and 620 nm to 830 nm. This characteristic reduces the impact on the human eye even when the junction temperature of the LED package 42 changes.

[0069] Next, a method for determining the slope of the spectral luminous efficiency will be described with reference to FIG.

[0070] 4A and 4B are diagrams showing the coefficients of a quartic function and the coefficients when the quartic function is differentiated. (a) of FIG. 4 shows the coefficients of the quartic function. For example, the quartic function is expressed as y=ax ４ +bx ３ +cx ２ +dx １+e. a is the coefficient for the fourth order, b is the coefficient for the third order, c is the coefficient for the second order, d is the coefficient for the first order, and e is the y-intercept. (b) of FIG. 4 shows the coefficients when a fourth-order function is differentiated. For example, a third-order function after differentiation is dy / dx=4ax ３ +3bx ２ +2cx+d. The a after differentiation is the coefficient for the third order, the b after differentiation is the coefficient for the second order, the c after differentiation is the coefficient for the first order, and the d after differentiation is the y-intercept.

[0071] First, an approximate curve of the spectral luminous efficiency is calculated based on the values ​​in Table 1 of JIS Z 8785 for the wavelength range of light emitted by the LED package 42, 360 nm or more and 830 nm or less. Specifically, the wavelength range of 360 nm or more and 830 nm or less is divided into nine regions. Then, an approximate equation of a quartic function is calculated for each of the nine regions. The approximate equation of the quartic function is an approximate equation in which the spectral luminous efficiency is a y function and the wavelength relative to the y function is an x ​​function.

[0072] Next, the calculated approximation of the quartic function is differentiated with respect to the y function by the x function.

[0073] Next, by applying each wavelength to the x function of the differentiated approximation formula, the slope of the spectral luminous efficiency can be found for each wavelength.

[0074] Specifically, as shown in (a) of Figure 4, in the wavelength region of 360 nm or more and 430 nm or less, in the approximate formula of the quartic function, the coefficient for order 4 is calculated to be 0.00000000176, for order 3 the coefficient is -0.00000266088, for order 2 the coefficient is 0.00150598478, for order 1 the coefficient is -0.37859310340, and the y-intercept is calculated to be 35.66906828795.

[0075] Furthermore, in the wavelength region of 430 nm or more and 480 nm or less, in the approximation formula for the quartic function, the coefficient for order 4 is 0.00000000629, the coefficient for order 3 is -0.00001081533, the coefficient for order 2 is 0.00699484606, the coefficient for order 1 is -2.01431865704, and the y-intercept is 217.82748299391.

[0076] Furthermore, in the wavelength region of 480 nm or more and 530 nm or less, in the approximation formula for the quartic function, the coefficient for order 4 is calculated to be -0.00000010354, the coefficient for order 3 is 0.00020474076, the coefficient for order 2 is -0.15154532717, the coefficient for order 1 is 49.77270769759, and the y-intercept is calculated to be -6121.29915981635.

[0077] Furthermore, in the wavelength region of 530 nm or more and 580 nm or less, in the approximation formula for the quartic function, the coefficient for order 4 is calculated to be -0.00000000581, the coefficient for order 3 is 0.00001361106, the coefficient for order 2 is -0.01214028519, the coefficient for order 1 is 4.86927756772, and the y-intercept is calculated to be -737.76143254309.

[0078] Furthermore, in the wavelength region of 580 nm or more and 630 nm or less, in the approximation formula for the quartic function, the coefficient for order 4 is calculated to be -0.00000000780, the coefficient for order 3 is 0.00002033762, the coefficient for order 2 is -0.01978120885, the coefficient for order 1 is 8.49737117988, and the y-intercept is calculated to be -1358.86460091943.

[0079] Furthermore, in the wavelength region of 630 nm or more and 680 nm or less, in the approximation formula for the quartic function, the coefficient for order 4 is calculated to be -0.00000000464, for order 3 the coefficient is 0.00001156964, for order 2 the coefficient is -0.01068890207, for order 1 the coefficient is 4.32379795026, and the y-intercept is calculated to be -643.12592929409.

[0080] Furthermore, in the wavelength region of 680 nm or more and 730 nm or less, in the approximation formula for the quartic function, the coefficient for order 4 is calculated to be 0.00000000253, for order 3 the coefficient is -0.00000733519, for order 2 the coefficient is 0.00798581492, for order 1 the coefficient is -3.86470307382, and the y-intercept is calculated to be 701.49165447756.

[0081] Furthermore, in the wavelength region of 730 nm or more and 780 nm or less, in the approximation formula for the quartic function, the coefficient for order 4 is 0.00000000011, the coefficient for order 3 is -0.00000035177, the coefficient for order 2 is 0.00040705891, the coefficient for order 1 is -0.20936915874, and the y-intercept is 40.38774381780.

[0082] Furthermore, in the wavelength region of 780 nm or more and 830 nm or less, in the approximation formula for the quartic function, the coefficient for order 4 is calculated to be 0.000000000004, for order 3 the coefficient is -0.000000014131, for order 2 the coefficient is 0.000017284083, for order 1 the coefficient is -0.009397388774, and the y-intercept is calculated to be 1.916367430853.

[0083] In addition, in the nine divided regions, for example, a region of approximately 10 nm may be added to the region of 430 nm or more and 480 nm or less, and the approximation of the quartic function may be calculated for the region of 420 nm or more and 490 nm or less. The added region of approximately 10 nm is a value added to reduce the difference in the values ​​at the joints of each region. Therefore, it is not limited to 10 nm, and a value around 10 nm may also be used. Furthermore, a value added to reduce the difference in the values ​​at the joints of each region may also be added to regions other than the region of 430 nm or more and 480 nm or less.

[0084] Next, as shown in FIG. 4B, in the wavelength region of 360 nm or more and 430 nm or less, in the differentiated approximation formula, the coefficient for order 3 is calculated to be 0.00000000704, the coefficient for order 2 is 0.00000798264, the coefficient for order 1 is 0.00301197, and the y-intercept is calculated to be −0.378593103.

[0085] Furthermore, in the wavelength region of 430 nm or more and 480 nm or less, the coefficient of the differentiated approximation formula is calculated to be 0.00000002514 for order 3, 0.000032446 for order 2, 0.013989692 for order 1, and the y-intercept is -2.01431865704.

[0086] Furthermore, in the wavelength region of 480 nm or more and 530 nm or less, in the differentiated approximation formula, the coefficient for order 3 is calculated to be −0.000000414143, the coefficient for order 2 is calculated to be 0.000614222, the coefficient for order 1 is calculated to be −0.303090654, and the y-intercept is calculated to be 49.77270769759.

[0087] Furthermore, in the wavelength region of 530 nm or more and 580 nm or less, the coefficient of the differentiated approximation formula is calculated to be −0.00000002323 for order 3, 0.0000408332 for order 2, −0.02428057 for order 1, and the y-intercept is 4.86927756772.

[0088] Furthermore, in the wavelength region of 580 nm or more and 630 nm or less, in the differentiated approximation formula, the coefficient for order 3 is calculated to be −0.00000003119, the coefficient for order 2 is calculated to be 0.0000610128, the coefficient for order 1 is calculated to be −0.039562418, and the y-intercept is calculated to be 8.49737117988.

[0089] Furthermore, in the wavelength region of 630 nm or more and 680 nm or less, in the differentiated approximation formula, the coefficient for order 3 is calculated to be −0.00000001856, the coefficient for order 2 is calculated to be 0.0000347089, the coefficient for order 1 is calculated to be −0.021377804, and the y-intercept is calculated to be 4.32379795026.

[0090] Furthermore, in the wavelength region of 680 nm or more and 730 nm or less, in the differentiated approximation formula, the coefficient for order 3 is calculated to be 0.00000001011, the coefficient for order 2 is calculated to be -0.000022005, the coefficient for order 1 is calculated to be 0.01597163, and the y-intercept is calculated to be -3.86470307382.

[0091] Furthermore, in the wavelength region of 730 nm or more and 780 nm or less, in the differentiated approximation formula, the coefficient for order 3 is calculated to be 0.00000000045, the coefficient for order 2 is calculated to be -0.0000010553, the coefficient for order 1 is calculated to be 0.000814118, and the y-intercept is calculated to be -0.20936915874.

[0092] Furthermore, in the wavelength region of 780 nm or more and 830 nm or less, in the differentiated approximation formula, the coefficient for order 3 is calculated to be 0.000000000017, the coefficient for order 2 is calculated to be -0.000000042393, the coefficient for order 1 is calculated to be 0.000034568167, and the y-intercept is calculated to be -0.009397388774.

[0093] By applying each wavelength to the x function of the differentiated approximation formula, the slope of the spectral luminous efficiency can be found for each wavelength.

[0094] Next, an example of adjusting chromaticity will be specifically described with reference to FIGS. 5A and 5B.

[0095] FIG. 5A shows a downward-sloping current characteristic and an upward-sloping junction temperature characteristic. (a) of FIG. 5A shows the relationship between the peak wavelength or dominant wavelength and the current. (b) of FIG. 5A shows the relationship between the peak wavelength or dominant wavelength and the junction temperature. (b) of FIG. 5B shows a constant current characteristic and a constant junction temperature characteristic. (a) of FIG. 5B shows the relationship between the peak wavelength or dominant wavelength and the current. (b) of FIG. 5B shows the relationship between the peak wavelength or dominant wavelength and the junction temperature.

[0096] The peak wavelength or dominant wavelength of the emitted light of each of the plurality of LED packages 42 may be included in the first high region and the second high region. In other words, each of the plurality of LED packages 42 has a characteristic in which the peak wavelength or dominant wavelength of the emitted light is outside the regions of 360 nm to 504 nm, 539 nm to 566 nm, and 620 nm to 830 nm. In this case, each of the plurality of LED packages 42 emitting light included in the first high region and the second high region has the characteristic (1) or (2).

[0097] (1) The characteristics of each of the multiple LED packages 42 emitting light included in the first high region and the second high region are such that the peak wavelength versus current or the dominant wavelength versus current shown in (a) of Figure 5A corresponds to a downward sloping characteristic, and the peak wavelength versus junction temperature or the dominant wavelength versus junction temperature shown in (b) of Figure 5A corresponds to an upward sloping characteristic.

[0098] In other words, each of the multiple LED packages 42 may have a characteristic that the peak wavelength or dominant wavelength decreases in a downward trend as the input current to the multiple LED packages 42 increases, and may also have a characteristic that the peak wavelength or dominant wavelength increases in an upward trend as the junction temperature of the multiple LED packages 42 increases.

[0099] In this way, if each of the multiple LED packages 42 has a peak wavelength versus current or a dominant wavelength versus current that declines to the right, and a peak wavelength versus junction temperature or a dominant wavelength versus junction temperature that increases to the right, these characteristics cancel each other out to become constant, making it easier to stabilize the chromaticity of the light emitted by the lighting device 40 during dimming. For example, "constant" may include an error of a few percent, such as ±3% or ±5%.

[0100] (2) The characteristics of each of the LED packages 42 emitting light included in the first high region and the second high region are such that the peak wavelength versus current or the dominant wavelength versus current shown in (a) of FIG. 5B is constant, and the peak wavelength versus junction temperature or the dominant wavelength versus junction temperature shown in (b) of FIG. 5B is constant. Note that "constant" does not necessarily mean "perfectly constant." For example, "constant" may include an error of a few percent, such as ±3% or ±5%.

[0101] In other words, each of the multiple LED packages 42 may have the characteristic that the peak wavelength or dominant wavelength remains constant even when the input current to the multiple LED packages 42 increases, and may also have the characteristic that the peak wavelength or dominant wavelength remains constant even when the junction temperature of the multiple LED packages 42 increases.

[0102] In this way, if each of the multiple LED packages 42 has a constant peak wavelength versus current or a constant dominant wavelength versus current characteristic, and also has a constant peak wavelength versus junction temperature or a constant dominant wavelength versus junction temperature characteristic, the chromaticity of the light emitted by the lighting device 40 becomes more stable when dimming is performed.

[0103] As described above, the light emitted by one or more of the multiple LED packages 42 may be realized by combining light emitted by the LED element 42a and fluorescence emitted by the phosphor 42c. Alternatively, the LED package 42 may include only the LED element 42a. In this case, the light emitted by the multiple LED packages 42 may be composed of direct light emitted by the LED element 42a and combined light of the light emitted by the LED element 42a and fluorescence emitted by the phosphor 42c. In this case, the light emitted by each of the multiple LED packages 42 has a broad emission spectrum. Therefore, even in a region with a steep slope such as the high region described above, fluctuations in total luminous flux are suppressed, and chromaticity differences can be suppressed during dimming.

[0104] [Effects, etc.] Next, effects, etc. of the lighting device 40, the lighting fixture 5, the lighting lamp, and the lighting system 1 according to the embodiment will be described.

[0105] As described above, the lighting device 40 of technique 1 according to this embodiment is a lighting device 40 including a plurality of LED packages 42 that emit two or more types of light with different chromaticity values, and when a first high region and a first low region lower than the first high region are set for a first luminous intensity distribution derived based on the spectral luminous efficiency in a wavelength region of 360 nm or more and less than 555 nm and the slope of the spectral luminous efficiency in the wavelength region of 360 nm or more and less than 555 nm, and when a second high region and a second low region lower than the second high region are set for a second luminous intensity distribution derived based on the spectral luminous efficiency in a wavelength region of 555 nm or more and the slope of the spectral luminous efficiency in the wavelength region of 555 nm or more and less than 830 nm, in each of the plurality of LED packages 42, the peak wavelength of the emitted light or the dominant wavelength of the emitted light is included in the first low region and the second low region.

[0106] As a result, since the first low region and the second low region contain the peak wavelength of the light emitted by the LED package 42 or the dominant wavelength of the light emitted by the LED package 42, people are less likely to perceive changes in the chromaticity of the light emitted from the LED package 42.

[0107] Therefore, according to the lighting device 40 of the present embodiment, it is possible to suppress the chromaticity difference during dimming.

[0108] Furthermore, in lighting device 40 of technique 2 relating to this embodiment, the first luminous intensity distribution is derived by the product of the spectral luminous efficiency in the wavelength region of 360 nm or more and less than 555 nm and the slope of the spectral luminous efficiency in the wavelength region of 360 nm or more and less than 555 nm, and the second luminous intensity distribution is derived by the product of the spectral luminous efficiency in the wavelength region of 555 nm or more and less than 830 nm and the slope of the spectral luminous efficiency in the wavelength region of 555 nm or more and less than 830 nm.

[0109] This makes it possible to calculate the first visual intensity distribution and the second visual intensity distribution, thereby making it possible to set the first low region and the second low region corresponding to the first visual intensity distribution and the second visual intensity distribution, i.e., the region in which people are less likely to perceive changes in the chromaticity of the light emitted from the LED package 42.

[0110] In addition, in the lighting device 40 of Technology 3 relating to this embodiment, the first low region is a region corresponding to 0 or more and 0.5 or less when the peak value of the first luminous intensity distribution is 1, and the second low region is a region corresponding to 0 or more and 0.5 or less when the peak value of the second luminous intensity distribution is 1.

[0111] According to this, the first low region and the second low region can be converted into relative values, and therefore the relative values ​​of the first low region and the relative values ​​of the second low region can be made common.

[0112] Furthermore, the lighting device 40 of Technology 4 relating to this embodiment is a lighting device 40 that is equipped with a plurality of LED packages 42 that emit two or more types of light with different chromaticity values, and in each of the plurality of LED packages 42, the peak wavelength or the dominant wavelength of the emitted light is included in any of the ranges of 360 nm or more and 504 nm or less, 539 nm or more and 566 nm or less, and 620 nm or more and 830 nm or less.

[0113] According to this, the peak wavelength or dominant wavelength of the light emitted by the LED package 42 is included in the ranges of 360 nm to 504 nm, 539 nm to 566 nm, and 620 nm to 830 nm, which correspond to the first and second low ranges, respectively, so that people are less likely to perceive changes in the chromaticity of the light emitted from the LED package 42. In this case as well, chromaticity differences during dimming can be suppressed.

[0114] Furthermore, a lighting device 40 according to a fifth aspect of the present embodiment is a lighting device 40 including a plurality of LED elements 42a that emit two or more types of light having different chromaticity values, and when a first high region and a first low region lower than the first high region are set for a first luminous intensity distribution derived based on the spectral luminous efficiency in a wavelength range of 360 nm or more and less than 555 nm and the slope of the spectral luminous efficiency in the wavelength range of 360 nm or more and less than 555 nm, and a second high region and a second low region lower than the second high region are set for a second luminous intensity distribution derived based on the spectral luminous efficiency in a wavelength range of 555 nm or more and less than 830 nm and the slope of the spectral luminous efficiency in the wavelength range of 555 nm or more and less than 830 nm, the peak wavelength of the light emitted by each of the plurality of LED packages 42 is Alternatively, the dominant wavelength of the emitted light is included in the first high region and the second high region, and the characteristics of each of the plurality of LED packages 42 emitting light included in the first high region and the second high region are such that the peak wavelength for the current supplied to each of the plurality of LED packages 42 or the dominant wavelength for that current slopes downward, and the peak wavelength for the junction temperature of each of the plurality of LED packages 42 or the dominant wavelength for that junction temperature slopes upward, or the peak wavelength for that current or the dominant wavelength for that current is constant, and the peak wavelength for that junction temperature or the dominant wavelength for that junction temperature is constant.

[0115] For example, it is generally believed that the higher the current input to an LED package, the higher the junction temperature of the LED package. However, as in the present embodiment, even if the peak wavelength or dominant wavelength of the light emitted by the LED package 42 falls within the first and second high wavelength regions, if the current characteristics of the peak wavelength or dominant wavelength and the junction temperature characteristics of the peak wavelength or dominant wavelength exhibit opposite characteristics, they cancel each other out and become constant, resulting in less deviation of the peak wavelength and more stable color even during dimming. Furthermore, if the current characteristics of the peak wavelength or dominant wavelength and the junction temperature characteristics of the peak wavelength or dominant wavelength are constant, the peak wavelength is less likely to shift and more stable color even during dimming. In these cases, chromaticity differences during dimming can also be suppressed.

[0116] Furthermore, the lighting device 40 of technique 6 relating to this embodiment is a lighting device 40 including a plurality of LED elements 42 a that emit two or more types of light with different chromaticity values, and in each of the plurality of LED packages 42, the peak wavelength or the dominant wavelength of the emitted light is located outside the regions of 360 nm or more and 504 nm or less, 539 nm or more and 566 nm or less, and 620 nm or more and 830 nm or less, and the characteristics of each of the plurality of LED packages 42 are such that the peak wavelength with respect to the current supplied to each of the plurality of LED packages 42 or the dominant wavelength with respect to that current decreases to the right, and the peak wavelength with respect to the junction temperature of each of the plurality of LED packages 42 or the dominant wavelength with respect to that junction temperature increases to the right, or the peak wavelength with respect to that current or the dominant wavelength with respect to that current is constant, and the peak wavelength with respect to that junction temperature or the dominant wavelength with respect to that junction temperature is constant.

[0117] For example, it is generally believed that a higher current input to an LED package increases the junction temperature of the LED package. However, as in the present embodiment, even if the peak wavelength or dominant wavelength of the light emitted by the LED package 42 falls outside the first and second high wavelength ranges (i.e., 360 nm to 504 nm, 539 nm to 566 nm, and 620 nm to 830 nm), if the current characteristics of the peak wavelength or dominant wavelength and the junction temperature characteristics of the peak wavelength or dominant wavelength exhibit opposite characteristics, they cancel each other out and become constant, resulting in less shift in the peak wavelength and more stable color even during dimming. Furthermore, if the current characteristics of the peak wavelength or dominant wavelength and the junction temperature characteristics of the peak wavelength or dominant wavelength are constant, the peak wavelength is less likely to shift and more stable color even during dimming. In this case, chromaticity differences during dimming can also be reduced.

[0118] Furthermore, in the lighting device 40 of Technology 7 relating to this embodiment, each of the plurality of LED packages 42 emits light whose peak wavelength or dominant wavelength is included in the first high wavelength region and the second high wavelength region, and includes an LED element 42 a and a sealing member 42 b that seals the LED element 42 a, and the sealing member 42 b contains a phosphor 42 c.

[0119] According to this, the inclusion of the phosphor 42c results in a broad emission spectrum of the light emitted from each of the plurality of LED packages 42. Therefore, even in a region with a steep slope such as the high region described above, fluctuations in the total luminous flux are suppressed, and chromaticity differences during dimming can be suppressed.

[0120] Furthermore, in the lighting device 40 of technique 8 relating to this embodiment, each of the plurality of LED packages 42 emits light whose peak wavelength or dominant wavelength is outside the ranges of 360 nm or more and 504 nm or less, 539 nm or more and 566 nm or less, and 620 nm or more and 830 nm or less, and includes an LED element 42 a and a sealing member 42 b that seals the LED element 42 a, and the sealing member 42 b contains a phosphor 42 c.

[0121] According to this, the inclusion of the phosphor 42c gives a broad emission spectrum to the light emitted from each of the plurality of LED packages 42. Therefore, even in a region with a steep slope such as the high region outside the regions of 360 nm to 504 nm, 539 nm to 566 nm, and 620 nm to 830 nm, fluctuations in total luminous flux are suppressed, and chromaticity differences during dimming can be suppressed.

[0122] In addition, in the lighting device 40 of Technology 9 according to the present embodiment, the chromaticity value of the light emitted by each of the plurality of LED packages 42 is at least two of the coordinate values ​​of purple, blue-purple, blue, blue-green, green, yellow-green, yellow, yellow-red, red, and red-purple shown in the x, y chromaticity coordinates defined in JIS Z 8110-1995.

[0123] Purple, blue-violet, blue, blue-green, green, yellow-green, yellow, yellow-red, red, and red-violet have a wide color gamut and high color purity, and have an emission spectrum with a steep peak value at a specific wavelength. Therefore, when the peak wavelength of emitted light shifts due to a change in junction temperature, chromaticity differences tend to occur.

[0124] However, according to this embodiment, even if the LED package 42 that emits light with high color purity is included, the chromaticity difference during dimming can be suppressed.

[0125] Furthermore, the lighting fixture 5 of Technique 10 according to this embodiment includes the lighting device 40 of any one of Techniques 1 to 9, and a power supply device 50 that supplies power to each of the plurality of LED packages 42.

[0126] This lighting fixture 5 also provides the same effects as those described above.

[0127] An illumination lamp according to an eleventh aspect of the present embodiment includes the illumination device 40 according to any one of the first to ninth aspects.

[0128] This illumination lamp also provides the same effects as those described above.

[0129] Furthermore, the lighting system 1 of technique 12 according to this embodiment includes a lighting device 40 according to any one of techniques 1 to 9, a power supply device 50 that supplies power to the lighting device 40, a control device 30 that controls the lighting device 40, and a communication device 10 that communicates regarding the control of the lighting device 40.

[0130] This lighting system 1 also provides the same effects as those described above.

[0131] (Other Embodiments) Although the embodiments have been described above, the present disclosure is not limited to the above-described embodiments.

[0132] For example, in the above-described embodiments, the lighting system is realized by a plurality of devices, but 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-described embodiments. When the lighting system is realized by a plurality of devices, the components of the lighting system described in the above-described embodiments may be distributed among the plurality of devices in any manner.

[0133] In the above-described embodiment, the processing performed by a specific processing unit may be performed by another processing unit. The order of multiple processing operations may be changed, or multiple processing operations may be performed in parallel.

[0134] In the above-described embodiments, each component may be realized by executing a software program suitable for that component, or by a program execution unit such as a CPU or processor reading and executing a software program recorded on a recording medium such as a hard disk or semiconductor memory.

[0135] Furthermore, each component may be realized by hardware. Each component may be a circuit (or integrated circuit). These circuits may form a single circuit as a whole, or each may be a separate circuit. Furthermore, each of these circuits may be a general-purpose circuit or a dedicated circuit.

[0136] Furthermore, the general or specific aspects of the present disclosure may be realized as a system, an apparatus, a method, an integrated circuit, a computer program, or a computer-readable recording medium such as a CD-ROM, or may be realized as any combination of a system, an apparatus, a method, an integrated circuit, a computer program, and a recording medium.

[0137] For example, the present disclosure may be realized as a lighting method executed by a computer such as a lighting system, as a program for causing a computer to execute the lighting method, or as a computer-readable non-transitory recording medium on which such a program is recorded.

[0138] In addition, this disclosure also includes forms obtained by applying various modifications to each embodiment that a person skilled in the art would think of, or forms realized by arbitrarily combining the components and functions of each embodiment within the scope that does not deviate from the intent of this disclosure.

[0139] REFERENCE SIGNS LIST 1 Lighting system 10 Communication device 30 Control device 40 Lighting device 42 LED package 42a LED element 42b Sealing member 42c Phosphor 50 Power supply device

Claims

1. A lighting device comprising a plurality of LED (Light Emitting Diode) packages that emit two or more types of light with different chromaticity values, wherein a first high region and a first low region lower than the first high region are set for a first luminous intensity distribution derived based on the spectral luminous efficiency in a wavelength range of 360 nm to less than 555 nm and the slope of the spectral luminous efficiency in the wavelength range of 360 nm to less than 555 nm, and a second high region and a second low region lower than the second high region are set for a second luminous intensity distribution derived based on the spectral luminous efficiency in a wavelength range of 555 nm to 830 nm and the slope of the spectral luminous efficiency in the wavelength range of 555 nm to 830 nm, wherein the peak wavelength or dominant wavelength of the emitted light of each of the plurality of LED packages is included in the first low region and the second low region.

2. The lighting device of claim 1, wherein the first luminous intensity distribution is derived by multiplying the spectral luminous efficiency in a wavelength range of 360 nm or more and less than 555 nm by the slope of the spectral luminous efficiency in a wavelength range of 360 nm or more and less than 555 nm, and the second luminous intensity distribution is derived by multiplying the spectral luminous efficiency in a wavelength range of 555 nm or more and less than 830 nm by the slope of the spectral luminous efficiency in a wavelength range of 555 nm or more and less than 830 nm.

3. The lighting device according to claim 1 or 2, wherein the first low region is a region corresponding to 0 or more and 0.5 or less when the peak value of the first luminous intensity distribution is 1, and the second low region is a region corresponding to 0 or more and 0.5 or less when the peak value of the second luminous intensity distribution is 1.

4. A lighting device equipped with multiple LED packages that emit two or more types of light with different chromaticity values, wherein the peak wavelength or dominant wavelength of the emitted light from each of the multiple LED packages is within one of the ranges of 360 nm to 504 nm, 539 nm to 566 nm, and 620 nm to 830 nm.

5. A lighting device comprising a plurality of LED elements that emit two or more types of light with different chromaticity values, wherein a first high region and a first low region lower than the first high region are set for a first luminous intensity distribution derived based on the spectral luminous efficiency in a wavelength range of 360 nm or more and less than 555 nm and the slope of the spectral luminous efficiency in the wavelength range of 360 nm or more and less than 555 nm, and a second high region and a second low region lower than the second high region are set for a second luminous intensity distribution derived based on the spectral luminous efficiency in a wavelength range of 555 nm or more and less than 830 nm and the slope of the spectral luminous efficiency in the wavelength range of 555 nm or more and less than 830 nm, wherein the peak wavelength or dominant wavelength of the emitted light is included in the first high region and the second high region, and the characteristics of each of the plurality of LED packages that emit light included in the first high region and the second high region are as follows: a lighting device in which the peak wavelength for a current supplied to each of the plurality of LED packages or the dominant wavelength for that current has a characteristic of decreasing to the right, and the peak wavelength for a junction temperature of each of the plurality of LED packages or the dominant wavelength for that junction temperature has a characteristic of increasing to the right, or in which the peak wavelength for a current or the dominant wavelength for a current has a constant characteristic, and the peak wavelength for a junction temperature or the dominant wavelength for a junction temperature has a constant characteristic.

6. A lighting device comprising a plurality of LED elements that emit two or more types of light with different chromaticity values, wherein the peak wavelength or dominant wavelength of the emitted light of each of the plurality of LED packages is outside the ranges of 360 nm to 504 nm, 539 nm to 566 nm, and 620 nm to 830 nm, and wherein the characteristics of each of the plurality of LED packages are such that the peak wavelength or the dominant wavelength for the current supplied to each of the plurality of LED packages slopes downward to the right, and the peak wavelength or the dominant wavelength for the junction temperature of each of the plurality of LED packages slopes upward to the right, or the peak wavelength or the dominant wavelength for the current is constant, and the peak wavelength or the dominant wavelength for the current is constant to the junction temperature.

7. The lighting device according to claim 5, wherein each of the plurality of LED packages emits light whose peak wavelength or dominant wavelength is included in the first high wavelength region and the second high wavelength region, and comprises an LED element and a sealing member that seals the LED element, and the sealing member contains a phosphor.

8. The lighting device according to claim 6, wherein each of the plurality of LED packages emits light whose peak wavelength or dominant wavelength is outside the ranges of 360 nm to 504 nm, 539 nm to 566 nm, and 620 nm to 830 nm, and comprises an LED element and a sealing member that seals the LED element, and the sealing member contains a phosphor.

9. The lighting device according to any one of claims 1, 2, and 4 to 8, wherein the chromaticity value of the light emitted by each of the plurality of LED packages is at least two of the coordinate values ​​of purple, blue-purple, blue, blue-green, green, yellow-green, yellow, yellow-red, red, and red-purple shown in the x, y chromaticity coordinates defined in JIS Z 8110-1995.

10. A lighting fixture comprising the lighting device according to any one of claims 1, 2, and 4 to 8, and a power supply device that supplies power to each of the plurality of LED packages.

11. An illumination lamp comprising the illumination device according to any one of claims 1, 2, and 4 to 8.

12. A lighting system comprising: a lighting device according to any one of claims 1, 2, and 4 to 8; a power supply device that supplies power to said lighting device; a control device that controls said lighting device; and a communication device that performs communication related to the control of said lighting device.

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