JP2021142778A - Lighting device - Google Patents

Abstract

To provide a lighting device capable of adjusting a spectral distribution of illumination light and being adjustable to light of various colors having a continuous spectral distribution.SOLUTION: A luminaire includes a first fluorescent-body containing LED device, a second fluorescent body-containing LED device, and an electric power control unit for controlling electric power supplied to each of the first fluorescent body-containing LED device and the second fluorescent body-containing LED device. The first fluorescent body-containing LED device includes one kind of an LED element selected from a blue LED element or a near ultraviolet LED element and a first fluorescent body, and the second fluorescent body-containing LED device includes an LED element and a second fluorescent body. The second fluorescent body-containing LED device and the first fluorescent body-containing LED device have fluorescence peak wavelengths contained in the distribution of their respective light emissions being separated by 10nm or more from each other, with a half value width of the fluorescence peak wavelength being 50 nm or more.SELECTED DRAWING: Figure 3

Description

The present invention relates to a lighting device capable of adjusting the spectral distribution of illumination light and adjusting the light of various colors having a continuous spectral distribution.

Conventionally, lighting devices that reduce fatigue during work, improve visibility, and promote good quality sleep have been proposed. Specifically, an illuminating device that emits light having each action by adjusting the range of the color coordinates of the irradiated light or adjusting the shape of the emission spectrum has been proposed.

The following Patent Document 1 is a lighting device capable of promoting a natural and high-quality sleep to a person. Area surrounded by the isobaric temperature line passing through 394) and the isobaric line with respect to the black body radiation locus, and the isobaric temperature line passing through the point B (0.419, 0.343) and the isobaric line with respect to the black body radiation locus. Disclosed is a lighting device characterized by emitting the illumination light of the illumination color inside.

Further, Patent Document 2 below describes an area of 400 nm to 800 nm in the spectrum of the illumination light as an illumination device that emits illumination light by emitting light of an LED element that improves comfort and reduces fatigue during work. On the other hand, the area of 600 nm to 700 nm is 30% or more and 70% or less, the area of 400 nm to 500 nm is 20% or less, and the spectrum of the illumination light has a maximum value between 600 nm and 700 nm. A lighting device in which the maximum value of a spectrum of 500 nm to 600 nm is 70% or less of the maximum value is disclosed.

Further, Patent Document 3 below includes a light emitting unit that irradiates the first illumination light as the illumination for the display as an illumination device capable of improving the readability of characters on the display, and the optical characteristics of the first illumination light are as follows. , Correlated color temperature is in the range of 3800K or more and 6500K or less, color deviation Duv is in the range of -9 or more and 0 or less, and the amount of intrinsic light sensitive retinal ganglion cell (ipRGC) stimulation is standardized by the light emitted from the D65 light source. A lighting device having a value of 0.6 or more is disclosed.

Further, the following Patent Document 4 is a light source, an LED device, and a light emitting display structure that emit light that makes the person feel bright in a dark place to give high visibility and is less likely to cause fatigue, in the coordinates of the chromaticity diagram of CIE1931. The coordinate W (0.33, 0.33) indicating coloring, the coordinate B (0.091, 0.133) at 480 nm on the spectral locus, and the coordinate G (0.373, 0.624) at 560 nm are connected. The entire light source in which the color purity is 2 to 50 in the region surrounded by the line segment WB and the linear segment WG and the spectral locus, and the area occupied by the continuous spectral wavelengths in the wavelength region 480 to 540 nm is 380 to 780 nm. Discloses a light source that emits light that is 15% or more of the spectral wavelength area of the above.

Here, an LED device configured by combining LEDs that emit light of different colors such as a red LED element, a green LED element, and a blue LED element is known as a full-color LED device or an RGB3in1 LED device. A technique for adjusting the emission color using a full-color LED device is also known.

For example, Patent Document 5 below provides an LED emission color control device including a light emitting color variable LED device equipped with light emitting diodes of each of the three primary colors of light and a current control circuit for controlling the current flowing through the light emitting diode for each color. To disclose. According to such an LED emission color control device, an emission color variable LED device capable of varying the type of emission color can be obtained by controlling the emission color and intensity.

Further, in Patent Document 6 below, for example, a plurality of LED elements having different red (R), green (G), and blue (B) are combined to form a light emitting body, and the power sent to the LED of each color is controlled by the power control unit. By doing so, the LED light source that controls the power so that the output light color becomes an arbitrary color is disclosed.

Further, Patent Document 7 below describes a red LED, a green LED, and a blue LED that emit light including a red wavelength, light containing a green wavelength, and light containing a blue wavelength so as to generate mixed color light of a specific color, respectively. A red current driving means that adjusts the current flowing through the red LED according to the current control signal, a green current driving means that adjusts the current flowing through the green LED to a constant set current, and a constant setting of the current flowing through the blue LED. A blue current driving means that adjusts to a current, a detection means that outputs a detection signal related to the light emission amount of the red LED, and a value of the light emission amount in which a value obtained from the detection signal output from the detection means is predetermined. Disclosed is an LED light source including a control means for outputting a current control signal to a red current drive means so as to be equal to.

Further, Patent Document 8 below discloses an LED lighting device in which the color temperature of light changes according to the brightness of the emitted light. Specifically, it has a first LED having a semiconductor light emitting element having an emission peak wavelength of 360 nm or more and 480 nm or less, and a semiconductor light emitting element having an emission peak wavelength of 360 nm or more and 480 nm or less, and emits white light having a predetermined color temperature. A non-lens portion that is arranged in the light emitting direction of the second LED and the light emitting direction of the first LED and has a light conversion member that converts the light emitted from the first LED into red light to orange light, and the light emitting direction of the second LED. The drive current supplied to the first LED is controlled by a constant value during the period in which the drive signal supplied from the outside is supplied to the lens module having the lens unit arranged in the light, and the drive current supplied to the second LED is controlled. Discloses an LED lighting device including a current control unit that controls a variable current according to the drive signal.

Japanese Unexamined Patent Publication No. 2013-171686 Japanese Unexamined Patent Publication No. 2013-171689 Japanese Unexamined Patent Publication No. 2018-08374 JP-A-2019-125777 Japanese Unexamined Patent Publication No. 8-250771 Japanese Unexamined Patent Publication No. 11-162660 Japanese Unexamined Patent Publication No. 2007-080865 Japanese Unexamined Patent Publication No. 2014-197501

Each of the lighting devices disclosed in Patent Documents 1 to 4 promotes a natural and good quality sleep for a person, reduces a feeling of fatigue, makes characters easier to read, and makes a person feel bright in a dark place for high visibility. It is possible to obtain an illumination light having the effect of giving. However, since each of these lighting devices is pre-dimmed to suit their respective purposes, it is not possible to select the type of light according to the physical condition and situation of the person. Specifically, when a person wants to promote sleep, adjust the light to promote sleep, when he / she wants to reduce fatigue, adjust the light to reduce fatigue, and when he / she wants to make the characters easier to read, make the characters easier to read. It was not possible to adjust the light to reduce the feeling of fatigue.

Further, each of the lighting devices disclosed in Patent Documents 5 to 8 mixes the light emitted from each LED element by controlling the current value flowing through each LED element of the red LED element, the green LED element, and the blue LED element. It is a lighting device that changes the light color by doing so. When the light emitted from the red LED element, the green LED element, and the blue LED element is mixed and dimmed as it is, the blue LED element is around 470 nm, the green LED element is around 530 nm, and the red LED element is around 630 nm. In order to show a spectral distribution that only has a large sharp wavelength peak, the light obtained by mixing the light emitted by these can only be toned by combining the sharp wavelength peaks that exhibit the three primary colors, like natural light. It was not possible to adjust the light emission to have a continuous spectral wavelength.

Further, since the conventional full-color LED device is composed of different LED elements of red (R), green (G), and blue (B), the power supply is controlled by different forward voltages to each LED element. Was difficult. Further, the life of the red LED element is shorter than the life of the blue LED element and the green LED element, and as a result, the life of the entire full-color LED device is short. Further, since the luminous efficiency of the red LED element decreases when the temperature becomes higher than that of the green LED element and the blue LED element, there is a problem that the emitted color deviates from the set color in the high temperature environment.

An object of the present invention is to provide an illuminating device capable of adjusting the spectral distribution of illumination light and adjusting to various colors of light having a continuous spectral distribution, which can solve the above-mentioned problems.

One aspect of the present invention includes a first phosphor-containing LED device, a second phosphor-containing LED device, power supplied to the first phosphor-containing LED device, and a second phosphor-containing LED device. The first phosphor-containing LED device includes a power control unit for controlling the supplied power, and includes one type of LED element selected from a blue LED element or a near-ultraviolet LED element and a first phosphor. The second phosphor-containing LED device includes an LED element and a second phosphor, and the second phosphor-containing LED device and the first phosphor-containing LED device are included in the spectral distribution of their respective luminescence. This is an illumination device in which the fluorescence peak wavelengths are separated from each other by 10 nm or more, and the half-value width of the fluorescence peak wavelength is 50 nm or more. In such a lighting device, the light emitted from the lighting device is emitted from the lighting device because the half-value width of the fluorescence peak wavelength of the two types of phosphor-containing LED devices that emit light having different spectral distributions is 50 nm or more. Is broad and emits light with a continuous spectral distribution. Further, in order to include a power control unit that independently controls the power supplied to the phosphor-containing LED devices having different emission distributions, the emission intensity in a specific wavelength region of the spectral distribution of the emitted light is adjusted. It can be adjusted to a broad and continuous spectral distribution. The result is a lighting device that has a continuous spectral distribution and can be adjusted to light of various colors.

The lighting device further includes a third phosphor-containing LED device, the power control unit controls the power supplied to the third phosphor-containing LED device, and the third phosphor-containing LED device includes an LED element. The maximum fluorescence peak wavelength included in the spectral distribution of the emission of the third phosphor-containing LED device is the first phosphor-containing LED device and the second phosphor-containing LED. It is preferable that the fluorescence peak wavelength of at least one of the devices is separated from each fluorescence peak wavelength by 10 nm or more, and the half-value width of the fluorescence peak wavelength is 50 nm or more. In such a lighting device, by mounting three types of phosphor-containing LED devices that emit light having different spectral distributions, the spectral distribution of the illumination light can be further adjusted, and the spectral distribution is broad and continuous. A lighting device that can be adjusted to various colors of light having a distribution can be obtained. Further, when the lighting device further includes a fourth phosphor-containing LED device and the power control unit controls the power supplied to the fourth phosphor-containing LED device, the spectral light of the illumination light is further dispersed. A lighting device that can adjust the distribution and can adjust to various colors of light having a broad and continuous spectral distribution can be obtained.

Further, in the lighting device, each phosphor contained in each of the phosphor-containing LED devices is a phosphor having a fluorescence peak wavelength in the range of 410 to 470 nm, and a phosphor having a fluorescence peak wavelength in the range of 430 to 490 nm. A wide range of color coordinates can be selected from phosphors having a fluorescence peak wavelength in the range of 490 to 530 nm, phosphors having a peak wavelength in the range of 500 to 590 nm, and phosphors having a fluorescence peak wavelength in the range of 580 to 680 nm. It is preferable because it enables dimming in a range. For example, when the ranges of the fluorescence peak wavelengths overlap between the second phosphor and the third phosphor, the phosphor having the fluorescence peak wavelength on the lower wavelength side is referred to as the second phosphor. Similarly, for example, when the ranges of the fluorescence peak wavelengths overlap in the third phosphor and the fourth phosphor, the phosphor having the fluorescence peak wavelength on the lower wavelength side is designated as the third phosphor.

Further, the lighting device further includes an LED device that does not contain a phosphor, and when the power control unit controls the power supplied to the LED device that does not contain a phosphor, dimming in a wider range of color coordinates is possible. It is preferable because it is possible. Further, the LED device containing no phosphor is preferably a blue LED device because the reproducible chromaticity range is widened and the long-term reliability of the lighting device is enhanced.

In addition, the lighting device is preferably used as internal lighting for automobiles.

Further, it is preferable that the power control unit performs PWM control to change the illumination light to 1 / f fluctuation, so that the light can give a more relaxed feeling to a person.

In addition, by automatically adjusting the spectral distribution of the illumination light by artificial intelligence, the optimum illumination light required by the user of the lighting device can be optimized according to the past spectral distribution settings and preferences, and the environment of the place. Therefore, it is preferable.

Further, it is preferable to have a function of emitting a sound or / or an odor in conjunction with the illumination light because it is possible to enhance the effect such as a feeling of relaxation given by the illumination light to a person.

According to the present invention, it is possible to obtain an illumination device capable of adjusting the spectral distribution of the illumination light and adjusting the light of various colors having a continuous spectral distribution.

FIG. 1 is a schematic top view of a phosphor-containing LED device 10 used in the lighting device 100 of the embodiment. FIG. 2 is a schematic cross-sectional view of the phosphor-containing LED device 10. FIG. 3 is a schematic explanatory view of the lighting device 100 of the embodiment. FIG. 4 is a schematic top view of the LED mounting substrate 11 incorporated in the lighting device main body 20. FIG. 5 is a circuit configuration diagram of the lighting control mechanism 40 incorporated in the lighting device main body 20. FIG. 6 is a circuit configuration diagram of the lighting control mechanism 41, which is another example of the lighting control mechanism. FIG. 7 is a circuit configuration diagram of the lighting control mechanism 42, which is another example of the lighting control mechanism. FIG. 8 is an emission spectrum of light emitted by each LED device used in the examples. FIG. 9 is an emission spectrum of the light emitted by the lighting device obtained in Experiment Nos. 1 to 9. FIG. 10 is the coordinates of the chromaticity diagram of the CIE color system of the light emitted by the lighting device obtained in Experiment Nos. 1 to 9. FIG. 11 is an emission spectrum of the light emitted by the lighting device obtained in Experiment Nos. 10 to 13. FIG. 12 shows the coordinates of the chromaticity diagram of the CIE color system of the light obtained in Experiment Nos. 10 to 13. FIG. 13 is an emission spectrum of the light emitted by the illuminating device obtained in Experiment Nos. 14 to 20. FIG. 14 is the coordinates of the chromaticity diagram of the CIE color system of the light emitted by the illuminating device obtained in Experiment Nos. 14 to 20. FIG. 15 is an emission spectrum of the light emitted by the lighting device obtained in Comparative Experiment Nos. 1 to 5. FIG. 16 shows the coordinates of the chromaticity diagram of the CIE color system of the light obtained in Comparative Experiment Nos. 1 to 5.

The illumination device of one embodiment according to the present invention includes a first phosphor-containing LED device, a second phosphor-containing LED device, a first phosphor-containing LED device, and a second phosphor-containing LED device. The first phosphor-containing LED device includes a power control unit that controls the power supplied to each of them, and the first phosphor-containing LED device includes one type of LED element selected from a blue LED element or a near-ultraviolet LED element and a first phosphor. The second phosphor-containing LED device includes an LED element and a second phosphor, and the second phosphor-containing LED device and the first phosphor-containing LED device have their respective emission spectral distributions. This is an illumination device in which the fluorescence peak wavelengths contained in the above are separated from each other by 10 nm or more, and the half-value width of the fluorescence peak wavelength is 50 nm or more. In addition, the lighting device may further include other types of phosphor-containing LED devices that exhibit different spectral distributions of light emission, such as a third phosphor-containing LED device, a fourth phosphor-containing LED device, and the like. .. Further, an LED device that does not contain a phosphor such as a blue LED device may be included.

Hereinafter, embodiments of the lighting device according to the present invention will be described.

[LED device]
The lighting device of the present embodiment includes at least two kinds of phosphor-containing LED devices that include one kind of LED element selected from a blue LED element or a near-ultraviolet LED element and a phosphor and emit light having different spectral distributions from each other. Be prepared. The at least two types of phosphor-containing LED devices include a first phosphor-containing LED device and a second phosphor-containing LED device, respectively. Then, each phosphor-containing LED device includes a phosphor that is excited by light emission from each LED element to emit fluorescence. The fluorescence peak wavelengths included in the spectral distributions of the first phosphor-containing LED device and the second phosphor-containing LED device are separated from each other by 10 nm or more. The half width of each fluorescence peak wavelength is 50 nm or more. Further, the lighting device further includes another type of phosphor-containing LED device that exhibits a different emission spectral distribution, such as a third phosphor-containing LED device, a fourth phosphor-containing LED device, or the like. May be provided. Further, as long as the lighting device includes the first phosphor-containing LED device and the second phosphor-containing LED device, the lighting device may include an LED device such as a blue LED device that does not contain a phosphor. The expressions of the first phosphor, the second phosphor, the third phosphor, the fourth phosphor, and the like are expressions for distinguishing different types of phosphors.

Hereinafter, as an example, four types of phosphor-containing LED devices will be described in detail. FIG. 1 is a schematic top view of four types of phosphor-containing LED devices 10 (10BG, 10G, 10Y, 10R) used in the present embodiment. Further, FIG. 2 is a schematic cross-sectional view of the phosphor-containing LED device 10 shown in FIG. 1 in a BB'cross section. The phosphor-containing LED device 10 includes a phosphor-containing LED device 10BG containing a phosphor 3BG having a fluorescence peak wavelength in the range of 430 to 490 nm, and a phosphor containing a phosphor 3G having a fluorescence peak wavelength in the range of 490 to 530 nm. LED device 10G, phosphor-containing LED device 10Y containing a phosphor 3Y having a peak wavelength in the range of 500 to 590 nm, or a phosphor-containing LED device 10R containing a fluorescent substance 3R having a fluorescence peak wavelength in the range of 580 to 680 nm. Either. More specifically, in the phosphor-containing LED device 10, the LED device main body 5 is a phosphor-containing cap 9 (9BG) containing a phosphor, a phosphor 3BG, a phosphor 3G, a phosphor 3Y, or a phosphor 3R. , 9G, 9Y, 9R).

As shown in FIG. 2, the LED device main body 5 seals the blue LED element 1, the package member 2 including the accommodating recess 2a accommodating the blue LED element 1, and the blue LED element 1 accommodated in the accommodating recess 2a. This is an LED light emitting device including the transparent resin encapsulant 4. A reflective film 7 made of silver plating or the like is formed on the inner wall surface of the accommodating recess 2a. One electrode of the blue LED element 1 is connected to the lead 2b, the other electrode of the blue LED element 1 is wire-bonded by a gold wire 6 and connected to the lead 2c, and the leads 2b and 2c are extended to the outside. ing. Lead 2b is the anode and lead 2c is the cathode. The blue LED element 1 emits light by connecting the positive electrode side of the power supply to the lead 2b of the LED device main body 5 and the negative electrode side of the power supply to the lead 2c to apply electric power. In such an LED device main body 5, the upper surface of the transparent resin encapsulant 4 serves as a light emitting surface. Then, a phosphor-containing cap 9 (9BG, 9G, 9Y, 9R) is attached so as to cover the light emitting surface of the LED device main body 5. The phosphor 3 contained in the phosphor-containing cap 9 is excited by the light emission of the blue LED element 1 to emit fluorescence. Therefore, the emission spectrum of the light emitted from the phosphor-containing LED device 10 shows a spectrum obtained by mixing the emission of the blue LED element 1 and the fluorescence of the phosphor 3.

The blue LED element 1 is a blue LED chip having an emission peak wavelength in the blue region of 420 nm to 480 nm. Specific examples of the blue LED element include, for example, a GaN-based element. Further, the transparent resin sealing material 4 seals and seals the blue LED element 1 housed in the housing recess 2a. Examples of the transparent resin forming the transparent resin encapsulant include silicone resin, epoxy resin, and acrylic resin. The main body of the LED device of this embodiment is a type called a surface mount type device (SMD), but instead of the SMD, other types such as a so-called bullet type, a package type, and a chip-on-board type (COB type) can be used. An LED device may be used.

Further, the phosphor-containing cap 9 that forms the phosphor layer in which the phosphor is dispersed is a phosphor in which the phosphor 3BG, the phosphor 3G, the phosphor 3Y, or the phosphor 3R is uniformly dispersed in the light transmissive resin. It is a molded body obtained by molding the containing sheet into a cap shape. Specific examples of the preferable light-transmitting resin include silicones such as silicone rubber (silicone elastomer) and silicone resin, and epoxy resins. As the phosphor layer, instead of the cap-shaped phosphor-containing sheet, even if the phosphor-containing sheet is embedded in the transparent resin encapsulant, the light emitting surface of the transparent resin encapsulant contains the phosphor. It may be a resin layer formed by applying a composition of a light-transmitting resin. Further, in the phosphor-containing LED device, instead of forming the phosphor layer, the phosphor may be dispersed in a transparent resin encapsulant that encloses the LED element.

Further, the phosphor-containing LED device may contain a colorant, if necessary, in addition to the phosphor in order to adjust the emission color and the shape of the spectral spectrum of the emitted light. Further, an additive such as a light diffusing material may be included in order to reduce the color unevenness of the mixed light. The colorant does not emit fluorescence and is used as a component for adjusting the emission color by absorbing light having a predetermined wavelength. Specific examples of such colorants include organic or inorganic pigments such as chrome green, chromium oxide, pigment green B, malakite green lake, fanal yellow green G, and phthalocyanine green, titanium oxide, and talc as green pigments. ， White pigment of barium sulfate, black pigment such as carbon black can be mentioned. Examples of the light diffusing material include silica and calcium carbonate.

When the phosphor layer is formed, its thickness is not particularly limited, but is preferably, for example, 20 to 3000 μm, more preferably 50 to 1000 μm, and particularly preferably 100 to 500 μm. The proportion of the phosphor dispersed in the phosphor layer is appropriately adjusted depending on the type of the phosphor, the thickness of the phosphor layer, and the like. As an example, when the thickness of the phosphor layer is 100 μm, light is used. It is preferable to blend 10 to 300 parts by mass, more preferably 50 to 200 parts by mass with respect to 100 parts by mass of the permeable resin.

The phosphor-containing LED device 10BG shown in FIG. 2A includes a phosphor-containing cap 9BG including a phosphor 3BG having a fluorescence peak wavelength in the range of 430 to 490 nm. Further, the phosphor-containing LED device 10G shown in FIG. 2B includes a phosphor-containing cap 9G including a phosphor 3G having a fluorescence peak wavelength in the range of 490 to 530 nm. Further, the phosphor-containing LED device 10Y shown in FIG. 2C includes a phosphor-containing cap 9Y containing a phosphor 3Y having a fluorescence peak wavelength in the range of 500 to 590 nm. Further, the phosphor-containing LED device 10R shown in FIG. 2D includes a phosphor-containing cap 9R including a phosphor 3R having a fluorescence peak wavelength in the range of 580 to 680 nm.

The phosphor 3BG is excited by, for example, light emission from a blue LED element to emit blue to green light having a peak wavelength in the range of 430 to 490 nm. Specific examples of such a phosphor include, for example, a silicate-based phosphor, a LuAG-based phosphor (LAG phosphor), an aluminate-based phosphor, a europium-activated strontium-aluminate-based phosphor (SAE phosphor), and β. -SiAlON: Sialone-based phosphors such as Eu, and the like can be mentioned.

Further, the phosphor 3G is excited by, for example, light emission of a blue LED element, and emits green to yellow light having a peak wavelength in the range of 490 to 530 nm. Specific examples of such phosphors include silicate-based phosphors, yttrium aluminum garnet-based phosphors (YAG phosphors), LuAG-based phosphors, phosphorate-based phosphors, and sialone-based phosphors such as β-SiAlON: Eu. Phosphors, etc. may be mentioned.

Further, the phosphor 3Y is excited by, for example, light emission of a blue LED element to emit yellowish light having a peak wavelength in the range of 500 to 590 nm. Specific examples of such a fluorescent substance include an active YAG-based fluorescent substance with cerium.

Further, the phosphor 3R is excited by, for example, light emission of a blue LED element, and emits reddish light having a peak wavelength in the range of 580 to 680 nm. Specific examples of such a phosphor include a nitride-based phosphor, a silicate-based phosphor, _{a Cousin-based phosphor such as (Sr, Ca) CaAlSiN 3} : Eu, and CaAlSiN ₃ : Eu, and a sialone-based phosphor. And so on.

The fluorescence peak wavelengths of the first phosphor-containing LED device and the second phosphor-containing LED device of the present embodiment are separated from each other by 10 nm or more. As a result, the fluorescence peak wavelengths included in the spectral distribution of each emission from the first phosphor-containing LED device and the second phosphor-containing LED device are separated from each other by 10 nm or more. Since the fluorescence peak wavelengths included in the spectral distribution of each emission from the first phosphor-containing LED device and the second phosphor-containing LED device are separated from each other by 10 nm or more, the spectral distribution of the illumination light can be adjusted and is wide. It can be adjusted to various colors of light having a continuous spectral distribution in the wavelength range. The fluorescence peak wavelengths of the first phosphor-containing LED device and the second phosphor-containing LED device are separated from each other by 10 nm or more, preferably 20 nm or more, and more preferably 40 nm or more, which is a wider wavelength range. It is preferable because it can be adjusted to various colors of light having a continuous spectral distribution. Further, when the fluorescence peak wavelengths of the first phosphor-containing LED device and the second phosphor-containing LED device are too far apart, the region where the emission intensity of the spectral distribution of the phosphor is low becomes the emission spectrum from the illumination device. It is preferable that the fluorescence peak wavelengths are separated in the range of 200 nm or less, more preferably 100 nm or less, in order to make the appearance remarkably easy.

Here, the fluorescence peak wavelength is defined as a wavelength corresponding to the intensity of the fluorescence peak having the highest intensity of the fluorescence spectrum of the phosphor. The half-value width of the fluorescence peak wavelength is defined as the width of the wavelength at which the relative intensity of the fluorescence peak wavelength becomes 0.5.

Further, the fluorescence peak wavelength of each emission from the first phosphor-containing LED device and the second phosphor-containing LED device of the present embodiment has a half width of 50 nm or more. Since the half-value width of the fluorescence peak wavelength of the first phosphor-containing LED device and the second phosphor-containing LED device is 50 nm or more, it is possible to obtain light of various colors having a continuous spectral distribution in a wide wavelength range. Can be adjusted. The full width at half maximum of the fluorescence peak wavelength is preferably 50 nm or more and 140 nm or less from the viewpoint of easy availability of the phosphor.

A phosphor-containing LED device containing a phosphor having a fluorescence peak wavelength in the range of 430 to 490 nm emits greenish blue light or the like by mixing the light emitted from the blue LED element and the fluorescence emitted by the phosphor. be able to.

Further, in a phosphor-containing LED device containing a phosphor having a fluorescence peak wavelength in the range of 490 to 530 nm, the light emitted from the blue LED element and the fluorescence emitted by the phosphor are mixed to form a yellowish green or greenish blue color. , Can emit light such as white with a greenish bluish tint.

Further, a phosphor-containing LED device containing a phosphor having a peak wavelength in the range of 500 to 590 nm emits light such as yellow or white by mixing the light emitted from the blue LED element and the fluorescence emitted by the phosphor. be able to.

Further, in a phosphor-containing LED device containing a phosphor having a fluorescence peak wavelength in the range of 580 to 680 nm, the light emitted from the blue LED element and the fluorescence emitted by the phosphor are mixed to produce red, pink, purple or the like. Can emit light.

The blue LED device including the blue LED element, the phosphor, and the phosphor-containing LED device containing the phosphor of each color in the blue LED device have been described above. The phosphor-containing LED device used in the present embodiment is excited by light emission from the near-ultraviolet LED element using a near-ultraviolet LED device including a near-ultraviolet LED element having an emission peak wavelength in the range of 350 to 420 nm. A phosphor-containing LED device containing a phosphor that emits blue to blue-green light having a peak wavelength in the range of 410 to 470 nm may be used. The phosphor-containing LED device using the near-ultraviolet LED device may be used in combination with the phosphor-containing LED device using the blue LED device.

Specific examples of phosphors that are excited by light emission from near-ultraviolet LED elements and emit light having a fluorescence peak wavelength in the range of 410 to 470 nm include europium-activated strontium-aluminate phosphors (SAE phosphors) and tungstates. Examples thereof include a system phosphor, a phosphate system phosphor, and the like.

[Lighting device]
The lighting device of the present embodiment contains a first phosphor-containing LED device and a second phosphor-containing LED device that emit light of different colors in which the fluorescence peak wavelengths included in the spectral distribution of each emission are separated from each other by 10 nm or more. Includes two or more phosphor-containing LED devices, including at least an LED device. The number of the first phosphor-containing LED device and the second phosphor-containing LED device is preferably plural. The fluorescence peak wavelengths included in the spectral distribution of each emission of the first phosphor-containing LED device and the second phosphor-containing LED device are separated from each other by 10 nm or more, and the half-value width of each fluorescence peak wavelength is 50 nm. That is all. The lighting device includes a power control unit that controls the power supplied to each phosphor-containing LED device. Next, such a lighting device will be described with reference to the drawings.

FIG. 3 is a schematic explanatory view of the lighting device 100 of the embodiment. In FIG. 3, the part shown by the broken line shows the internal structure. As shown in FIG. 3, the lighting device 100 includes a lighting device main body 20 fixed to the ceiling W and an instruction unit 50 connected to the lighting device main body 20.

The lighting device main body 20 includes an integrating sphere housing 15 and a diffusion member 16 arranged in an opening F provided as a light outlet of the integrating sphere housing 15. Then, on the inner wall surface of the integrating sphere housing 15, LED mounting boards 11 (11BG, 11G, 11Y, 11R) on which different types of phosphor-containing LED devices are mounted at four places at equal intervals are arranged. .. A reflective film for diffusing light is formed on the inner wall surface of the integrating sphere housing 15. Further, a power supply 30 for supplying electric power to the LED mounting board 11 is connected to the lighting device main body 20. The LED mounting board 11 and the power supply 30 form a lighting mechanism 40 as described later. The diffusion member is a diffusion plate for lighting, and examples thereof include an acrylic milk white plate. By causing each phosphor-containing LED device to emit light, the mixed color light M that has passed through the diffusing member 16 is extracted.

The lighting device 100 includes an integrating sphere housing 15 that exhibits high color mixing performance, but is not limited to such a shape as long as the light emitted from each LED device can be mixed. For example, as a form in which light emitted from each LED device other than the integrating sphere housing is mixed, an optical member such as a lens or a light guide, a diffuse reflection member such as a diffuser plate or a reflector, and the like can be mentioned. Further, the LED mounting substrate 11 may be provided with an LED mounting substrate for each LED device including different types of phosphor-containing LED devices, or different types of phosphor-containing LEDs whose power is controlled on one substrate. A mounting board on which the device is mounted may be used, or a lighting device may be configured by combining them.

Reference numeral 11BG is a first LED mounting substrate on which a plurality of phosphor-containing LED devices 10BG including the phosphor 3BG are mounted. Reference numeral 11G is a second LED mounting substrate on which a plurality of phosphor-containing LED devices 10G including the phosphor 3G are mounted. Reference numeral 11Y is a third LED mounting substrate on which a plurality of phosphor-containing LED devices 10Y including the phosphor 3Y are mounted. Reference numeral 11R is a fourth LED mounting substrate on which a plurality of phosphor-containing LED devices 10R including the phosphor 3R are mounted. FIG. 4 shows a schematic top view of an example of the LED mounting substrate. The number and arrangement of the phosphor-containing LED devices mounted on each LED mounting substrate are appropriately adjusted according to the application, the emission intensity of each phosphor-containing LED device, and the like.

Each phosphor-containing LED device may be mounted one by one on the LED mounting substrate, or may be mounted in plurality. Examples of the number of each of the plurality of phosphor-containing LED devices include 2 to 200, and further 2 to 100.

In each LED device, the positive electrode side of the power supply is connected to the anode side of each LED device, and the negative electrode side of the power supply is connected to the cathode side to the mounting portion of the circuit formed on each LED mounting substrate. The LED devices mounted on each LED mounting board are preferably connected in parallel.

Further, examples of the power supply 30 include a household AC100V AC power supply and a power supply using a vehicle battery or the like as a primary power supply. Electric power is supplied to each LED device as a current converted into a DC voltage.

On the other hand, the indicator unit 50 instructs the electric power supplied to each of the LED mounting boards 11 (11BG, 11G, 11Y, 11R). The indicator unit 50 includes channels (ch1 to 4) corresponding to each LED mounting board 11 (11BG, 11G, 11Y, 11R). Signal lines L1 to L4 for instructing the electric energy set in the channels (ch1 to 4) as electric signals are connected to the instruction unit 50. The other ends of the signal lines L1 to L4 are connected to the signal input terminals of the LED mounting boards 11 (11BG, 11G, 11Y, 11R). Then, by turning each of the volume knobs 51 to 54, the electric power supplied to each LED mounting board 11 is set. The amount of current corresponding to the amount of electric power is displayed on the current value meters 55 to 58 corresponding to the channels (ch1 to 4).

The indicator 50 adjusts the electric power supplied to each LED mounting board 11 by turning the volume knobs 51 to 54, respectively, and indicates the electric power supplied to each LED device by a voltage value. Alternatively, it may be indirectly instructed by the amount of electric power based on a relative value, or may be indirectly instructed by the amount of electric power supplied in association with the spectral distribution or tint of light.

Further, in the lighting device 100, a signal is transmitted between the lighting device main body 20 and the indicator unit 50 by a wired connection via signal lines L1 to L4. Instead of such signal line communication, infrared communication, communication using ITC technology via the Internet line, wireless communication such as Wi-fi communication and Bluetooth communication, and voice communication using a voice recognition function may be used. good. Further, as the instruction unit, instead of the dedicated device terminal, an electronic device terminal such as a smartphone or a personal computer in which an application capable of directly or indirectly instructing the amount of power as described above may be used may be used. In addition, by using artificial intelligence (AI) or IoT technology, it is used, for example, by irradiating illumination light with a spectral distribution with good visibility when doing desk work, based on the accumulated data. The optimum spectral distribution of light required by the user of the luminaire may be automatically adjusted according to the environment.

In the case of a lighting device having an artificial intelligence (AI) function, for example, an artificial intelligence is provided as a processing unit in the configuration of the lighting device, and the user can perform IoT measurement of biological information such as eye movements and heartbeats of the user. Class classification and regression are performed from data such as light patterns set for each hour, and the artificial intelligence processing unit extracts features related to cognitive sensation information such as user visibility and fatigue, and then rules and patterns are created. It is possible to automatically adjust the spectral distribution of light that creates a comfortable lighting environment for the user by processing in the processing unit to be introduced and issuing an instruction to adjust the power to the power control unit. In addition, when using IoT technology, the processing unit is connected to the network, and network information is acquired with other devices and devices such as personal computers and air conditioners in the room where the lighting device is installed, and with other devices and devices. It may operate in conjunction with each other.

Next, the lighting mechanism 40 including the LED mounting board 11 incorporated in the lighting device main body 20, the power supply 30, and the like will be described. FIG. 5 shows a schematic configuration diagram of the lighting mechanism 40.

In the lighting mechanism 40, the LED drivers 25 (25BG, 25G, 25Y, 25R) that are power control units for the first LED mounting board 11BG, the second LED mounting board 11G, the third LED mounting board 11Y, and the fourth LED mounting board 11R, respectively. Is implemented. The LED drivers 25BG, 25G, 25Y, and 25R independently control the power supplied to the corresponding LED mounting boards 11BG, 11G, 11Y, and 11R. The power control unit may have a function of controlling the power supplied to the LED mounting board, and in addition to the LED driver, a microcomputer (MCU) or manually adjusting the variable resistance may be selected as appropriate. can.

Further, a plurality of each phosphor-containing LED device are connected in parallel to each LED mounting substrate. Power is supplied from the power source 30 to each LED mounting board via the power control unit 25. The LED driver is a drive module that controls light emission by controlling the magnitude of the current in order to light a circuit for turning on / off an LED or an LED device. The LED driver includes, for example, a PWM control circuit for controlling brightness, a dynamic lighting control circuit for lighting a plurality of LED devices, and the like. Further, according to the PWM control of the LED driver, it is possible to control the lighting indicating 1 / f fluctuation.

Signal lines L1 to L4 are connected to each of the LED drivers 25 to transmit a signal indicating the power supplied from the indicator 50 to each LED mounting board 11. Specifically, L1 is used for the input terminal DIM of the LED driver 25BG, L2 is used for the input terminal DIM of the LED driver 25G, L3 is used for the input terminal DIM of the LED driver 25Y, and L3 is used for the input terminal DIM of the LED driver 25R. L4 is connected.

The instruction unit 50 transmits an instruction in response to the operation of the volume knob to each LED driver 25 as a signal. Each LED driver 25 receives a signal through the input terminal DIM, and controls the electric power supplied by changing the current and the like supplied to the LED mounting boards 11BG, 11G, 11Y, and 11R. Examples of the method of controlling the electric power include constant current control in which each LED device is driven by a constant current and the duty ratio is changed by PWM control, and constant voltage control. The amount of current supplied is detected by the _{current sense resistor R fb.}

The power supplied to each LED mounting board 11 is set by the volume knob of the indicator unit 50, and each LED driver 25 changes the amount of power supplied to the LED device mounted on each LED mounting board. The intensity of light emission from the LED device mounted on the LED mounting substrate changes. Then, the light emitted from each LED mounting substrate is diffused and mixed inside the integrating sphere housing 15 of the lighting device main body 20, and the light is taken out through the diffusion member 16. Further, by turning each volume knob 51 to 54 of the indicator unit 50, the spectral distribution of the emission spectrum from the lighting device 100 is changed.

In the above-mentioned lighting device 100, an example in which four types of phosphor-containing LED devices are included as two or more types of phosphor-containing LED devices including a first phosphor-containing LED device and a second phosphor-containing LED device. explained. The type of the phosphor-containing LED device included in the two or more types of phosphor-containing LED devices is not limited to four types, and may be five or more types, or two or three types. At this time, as the number of types of the phosphor-containing LED device increases, the intensity of the spectral distribution of the illumination light for each wavelength region can be finely adjusted. Further, as long as the above-mentioned two or more types of phosphor-containing LED devices are included, a blue LED device having no phosphor, a blue LED device having a diffusion layer, or the like may be used.

Further, as another example of the lighting control mechanism, for example, the lighting control mechanism 41 as shown in FIG. 6 can be exemplified. In the lighting control mechanism 41, a plurality of phosphor-containing LED devices 10BG, a plurality of phosphor-containing LED devices 10G, and a plurality of phosphors, each of which is grouped and the amount of power is controlled on one LED mounting substrate 11. A containing LED device 10Y and a plurality of phosphor-containing LED devices 10R are mounted. The amount of power supplied to each of the plurality of phosphor-containing LED devices (10BG, 10G, 10Y, 10R) of each group is independently controlled by one LED driver 25. Specifically, the LED driver 25 that has received the signal instructing the power from the instruction unit 50 transmitted via the signal lines L1 to L4 contains the controlled current M1 and the phosphor in the phosphor-containing LED device 10BG. A controlled current M1 of the LED device 10G, a controlled current M3 of the phosphor-containing LED device 10Y, and a controlled current M4 of the phosphor-containing LED device 10R are supplied. That is, the LED driver 25 has a plurality of phosphor-containing LED devices (10BG, 10G, 10Y, 10R) for each group in response to the signal instructing the power from the indicator unit 50 transmitted via the signal lines L1 to L4. ), And the current corresponding to the specified amount is supplied.

Further, as another example of the lighting control mechanism, for example, the lighting control mechanism 42 as shown in FIG. 7 can be exemplified. In the lighting control mechanism 42, a plurality of phosphor-containing LED devices 10BG, a plurality of phosphor-containing LED devices 10G, and a plurality of phosphors, each of which is grouped and the amount of power is controlled on one LED mounting substrate 11. A containing LED device 10Y and a plurality of phosphor-containing LED devices 10R are mounted. The amount of electric power supplied to each of the plurality of phosphor-containing LED devices (10BG, 10G, 10Y, 10R) of each group is independently controlled by the microcomputer 26. Specifically, the microcomputer 26 that has received the signal instructing the power from the instruction unit 50 transmitted via the signal lines L1 to L4 is the controlled current M1 of the phosphor-containing LED device 10BG and the phosphor-containing LED. A controlled current M1 of the device 10G, a controlled current M3 of the phosphor-containing LED device 10Y, and a controlled current M4 of the phosphor-containing LED device 10R are supplied. That is, in response to the signal instructing the electric power from the indicator unit 50 transmitted via the signal lines L1 to L4, the microcomputer 26 is a plurality of phosphor-containing LED devices (10BG, 10G, 10Y, 10R) for each group. A current is supplied according to the amount indicated for each.

According to such a lighting device, the emission intensity of a phosphor-containing LED device in which the maximum fluorescence peak wavelengths are separated from each other by 10 nm or more and the half-value width of the maximum fluorescence peak wavelength is 50 nm or more is independently adjusted. Therefore, it is possible to obtain a lighting device that can adjust the spectral distribution of the illumination light, adjust the spectral distribution to be broad and continuous, and adjust the light to various colors.

The lighting device of the present embodiment described above is preferably used for lighting for facilities such as houses and hospitals, indirect lighting, internal lighting for transportation devices such as automobiles, airplanes, ships, and trains, street lights, lighting modules, and the like. In particular, as internal lighting for transportation equipment, automobile room lamps, ambient lighting, map lamps, vanity lamps, foot lamps, light guide light sources, instrument panels, steering switches, heat control panels, power window switches, consoles, etc. It is preferably used as a backlight source for operation switches.

Dimming with the lighting device of this embodiment is useful in the following situations. For example, riding a car for a long time gives the driver and passengers a feeling of fatigue, tension, drowsiness, decreased work efficiency, and a feeling of boredom. In such a case, the driver or passenger can be illuminated by adjusting the light to relax, give tension, read, or awaken according to the situation of the driver or passenger. It is possible to change the consciousness of the vehicle and adjust the lighting to the optimum light according to the diversification of ways of spending other than driving in the car.

In addition, for example, the reflection spectrum of the moon color, sky color, petal color, insect color, water surface color, fire color, plant color, mushroom color, etc. existing in the natural world is reproduced by illumination light. By doing so, it is possible to give a feeling of familiarity, calmness, discomfort, a sense of crisis, and the like to a person's psychology.

Further, for example, it is possible to provide a light that is gentle to the human eye. There are two types of photoreceptor cells in the eye for humans to sense light: pyramidal cells, which mainly function in a bright environment, and rod cells, which mainly function in a dark environment. It is known that when photoreceptor cells are continuously stimulated by light of the same wavelength, there is a risk of asthenopia and adverse effects on photoreceptor cells. A conventional full-color LED device or a lighting device using an RGB3in1 LED device, which is composed of a combination of conventional LEDs that emit light of different colors such as a red LED element, a green LED element, and a blue LED element, emits light with sharp peaks of three primary colors. It is said that the stimulus to the eyes is strong because the color of the light is adjusted by combining the above, and in particular, the adverse effects of the blue light emitted from the blue LED element on the retina have been studied in various ways. In addition, there is a problem that a person with color vision deficiency cannot perceive light in a specific wavelength region or when the wavelength range of light that can be perceived is narrow. By using the illumination device of the present embodiment, it is possible to adjust the light to be easily perceived by a person with color vision deficiency by using the illumination light having a wide spectral distribution.

In addition, the lighting device of the present embodiment has a function of emitting sounds and odors that give a feeling of relaxation, tension, and a sense of crisis in conjunction with the illumination light that gives a feeling of relaxation, tension, and a sense of crisis. It is also good, and it is possible to enhance the effect such as a feeling of relaxation obtained by the illumination light.

In addition to light such as odor and sound, the lighting device may have a function of promoting relaxation, awakening, danger, etc. to a person. In addition to the illumination light of this lighting device, it is preferable that the functionality required by the user can be provided to the human sense of smell and hearing, for example, the relaxing effect, the awakening effect, and the cognitive effect of danger are enhanced.

Hereinafter, the present invention will be specifically described with reference to Examples. The scope of the present invention is not limited to the examples.

In the example, a phosphor layer in which 10 kinds of phosphors A to J were mixed with silicone rubber was prepared. Specifically, each of the 10 types of phosphors was uniformly dispersed in silicone rubber to prepare a phosphor layer (fluorescent-containing cap) having a thickness of 0.3 mm.

In the examples, a blue LED device having an emission peak wavelength of 450 nm and a half-value width of 16 nm was used. Specifically, NSSC063A manufactured by Nichia Corporation was used as the blue LED device. Then, as follows, any of the above-mentioned 10 types of phosphor layers is adhered to the light emitting surface of each LED device with a silicone-based adhesive to manufacture the phosphor-containing LED devices A1 to J1 shown in Table 1. bottom.

The emission spectra of the phosphor-containing LED devices A1 to J1 are shown in FIG.

Then, a total of 8 LED devices of 2 × 4 were mounted on the LED device mounting board having a thickness of 20 × 40 mm and a thickness of 2 mm. Any of the above-mentioned phosphor-containing LED devices or blue LED devices of the same type were grouped and mounted on each LED device mounting substrate.

A housing of an integrating sphere having a diameter of 120 mm as shown in FIG. 3, having openings serving as light outlets having a diameter of 25 mm, and four types at four locations at equal intervals on the inner wall surface of the housing. An LED mounting board on which any of the above LED devices was mounted was arranged. A reflective film made of barium sulfate is formed on the inner wall surface, and the light emitted from each LED device is mixed by the reflection on the inner wall surface of the housing and emitted from the opening through the diffusion member.

Then, a power source was connected to each board in order to supply electric power to the LED device mounted on each LED device mounting board. The power supply is AC100V, and the current values applied to each LED device are independently connected via a current control circuit in which the current value is controlled by the volume knob and an LED driver equipped with an AC / DC converter. ..

Then, the combination of the blue LED device or each LED device mounting substrate on which any of the 10 types of phosphor-containing LED devices A1 to J1 was mounted was changed and arranged at four places on the inner wall surface of the housing. .. Then, the amount of current supplied to the LED device mounted on each LED device mounting board was changed by the volume knob, and the mixed color light in which the light emitted from the four types of LED devices was mixed was taken out from the opening of the housing. At this time, the current value supplied to each LED device is set so that the color coordinates of the XYZ color system are obtained with the pure white color coordinates (x, y) = (0.333, 0.333) as the target value. Adjusted with the volume knob. The color coordinates and color rendering index Ra of the mixed color light are shown in Table 2. Further, FIG. 9 shows an emission spectrum of the mixed color light emitted by the lighting apparatus in Experiment Nos. 1 to 9, and FIG. 10 shows an XY chromaticity diagram of the CIE color system.

As shown in FIG. 10, the mixed color lights in Experiment Nos. 1 to 9 were all colors that approximated the pure white color coordinates (x, y) = (0.333, 0.333). Then, as shown in FIG. 9, the mixed color lights in Experiment Nos. 1 to 9 had emission spectra that were significantly different from each other. From these results, according to the lighting device according to the present invention, by adjusting the combination of each LED device and the electric power to each LED device, it is possible to adjust the light emission to show a significantly different emission spectrum even if the color is the same. You can see that you can do it. With reference to Table 2, the influence of the difference in the emission spectrum can be seen from the fact that the color rendering properties Ra are significantly different. It can be seen that such an illumination device can adjust the spectral distribution of the illumination light and can adjust the light to various colors having a continuous spectral distribution.

Next, in Experiment Nos. 10 to 13, the color coordinates (x, y) = (0.31, 0.35), (0.47, 0. 37), (0.50, 0.38), (0.32, 0.33) were dimmed.

In addition, Experiment No. 10 reproduces the light emission described in JP-A-2019-125777, which is considered to be light that does not give a feeling of fatigue, and Experiment No. 11 is JP-A-2013, which is considered to be light that gives relaxation. The light emission described in Japanese Patent Application Laid-Open No. -171689 is reproduced, and Experiment No. 12 is a reproduction of the light emission described in Japanese Patent Application Laid-Open No. 2013-171686, which is considered to be light that can obtain good quality sleep. Experiment No. 13 reproduces the light emission described in Japanese Patent Application Laid-Open No. 2018-083374, which is considered to be light having excellent visibility. The results are shown in Table 3. Further, the emission spectrum of the mixed color light in Experiment Nos. 10 to 13 is shown in FIG. 11, and the XY chromaticity diagram of the CIE color system is shown in FIG.

As shown in FIG. 12, the mixed color light in Experiment Nos. 10 to 13 had a chromaticity and a spectral distribution close to the color coordinates of the light, which are said to have the above-mentioned effects, respectively. The mixed color light in Experiment Nos. 10 to 13 had a continuous spectral distribution as shown in FIG. From these results, according to the lighting device according to the present invention, the spectral distribution of the lighting light can be adjusted by controlling the combination of the LED devices and the power to each LED device, and the light can be adjusted to various colors. I understand.

Next, in Experiment Nos. 14 to 20, the color coordinates (x, y) = (0.298, 0.293), (0.298, 0. 284), (0.291, 0.252), (0.342, 0.331), (0.321, 0.290), (0.411, 0.489), (0.362, 0. The color of 523) was dimmed. The results are shown in Table 4. Further, the emission spectrum of the mixed color light in Examples 14 to 20 is shown in FIG. 13, and the XY chromaticity diagram of the CIE chromaticity system is shown in FIG.

In Experiment Nos. 14 to 20, the power of each LED device was adjusted by using the same combination of the three types of phosphor-containing LED devices and the blue LED device. According to such a lighting device, it can be seen that the spectral distribution can be finely adjusted by combining the same four types of LED devices. Further, it can be seen that the spectral distribution can be finely adjusted by finely adjusting the electric power.

[Comparison example]
Next, in a conventional lighting device using an RGB3in1 LED device, which is an LED device that emits light of different colors of a red LED element, a green LED element, and a blue LED element, the current value supplied to each LED element was controlled. The results are shown in Table 5. The emission spectrum of the mixed color light in Comparative Experiment Nos. 1 to 5 is shown in FIG. 15, and the XY chromaticity diagram of the CIE color system is shown in FIG.

From the emission spectrum of the mixed color light of Comparative Experiment Nos. 1 to 5, the peak wavelengths of the red, green, and blue light emitting elements are fixed and the emission is a sharp peak, and the pure white coordinates of Comparative Experiment No. 1 (0. Even when 33, 0.33) was reproduced, the spectral distribution was not broad and continuous. Further, Comparative Experiment No. 2 reproduced light having the same color coordinates as Experiment No. 10, but the shape of the spectral distribution was different and the light did not give a feeling of fatigue.

1 Blue LED element 2 Package member 2a Storage recess 2b Lead 2c Lead 3 (3BG, 3G, 3R, 3Y) Fluorescent material 4 Transparent resin encapsulant 5 LED device body 6 Gold wire 7 Reflective film 9 (9BG, 9G, 9R, 9Y) Fluorescent material-containing cap 10 (10BG, 10G, 10R, 10Y) Fluorescent material-containing LED device 11 LED mounting board 11BG 1st LED mounting board 11G 2nd LED mounting board 11Y 3rd LED mounting board 11R 4th LED mounting board 15 Integrating sphere housing 16 Diffusing member 20 Lighting device body 25 LED driver (power control unit)
26 Microcomputer (power control unit)
30 Power supply 40, 41, 42 Lighting mechanism 100 Lighting device

Claims (7)

The power supplied to the first phosphor-containing LED device, the second phosphor-containing LED device, the first phosphor-containing LED device, and the second phosphor-containing LED device are supplied to each of the first phosphor-containing LED device and the second phosphor-containing LED device. Equipped with a power control unit that controls power
The first phosphor-containing LED device includes one type of LED element selected from a blue LED element or a near-ultraviolet LED element and a first phosphor, and the second phosphor-containing LED device includes the LED. Including the element and the second phosphor
The fluorescence peak wavelengths included in the spectral distributions of the second phosphor-containing LED device and the first phosphor-containing LED device are separated from each other by 10 nm or more, and the half-value width of the fluorescence peak wavelength is large. A lighting device characterized by having a wavelength of 50 nm or more. A third phosphor-containing LED device is further provided, and the power control unit controls the power supplied to the third phosphor-containing LED device.
The third phosphor-containing LED device includes the LED element and the third phosphor.
The fluorescence peak wavelength included in the spectral distribution of the emission of the third phosphor-containing LED device is the fluorescence of at least one of the first phosphor-containing LED device and the second phosphor-containing LED device. The lighting device according to claim 1, wherein the fluorescence peak wavelength is separated from the peak wavelength by 10 nm or more and the half-value width of the fluorescence peak wavelength is 50 nm or more. A fourth phosphor-containing LED device is further provided, and the power control unit controls the power supplied to the fourth phosphor-containing LED device.
The fourth phosphor-containing LED device includes the LED element and the fourth phosphor.
The fluorescence peak wavelength included in the emission spectral distribution of the fourth phosphor-containing LED device is the first phosphor-containing LED device, the second phosphor-containing LED device, and the third phosphor-containing LED. The lighting device according to claim 2, wherein at least one of the devices is separated from each of the fluorescence peak wavelengths by 10 nm or more. The first phosphor, the second phosphor, the third phosphor, and the fourth phosphor are fluorescents having a fluorescence peak wavelength in the range of 410 to 470 nm, in the range of 430 to 490 nm. Select from phosphors having a fluorescence peak wavelength, phosphors having a fluorescence peak wavelength in the range of 490 to 530 nm, phosphors having a peak wavelength in the range of 500 to 590 nm, and phosphors having a fluorescence peak wavelength in the range of 580 to 680 nm. The lighting device according to claim 3. The lighting device according to any one of claims 1 to 4, further comprising an LED device that does not contain a phosphor, and the power control unit controls power supplied to the LED device that does not contain a phosphor. The lighting device according to any one of claims 1 to 6, which is an internal lighting of an automobile. The lighting device according to any one of claims 1 to 6, wherein the lighting device is 1 / f fluctuation lighting by PWM control of the power control unit.

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