Lighting equipment

Abstract

To provide a lighting device capable of adjusting light so as to change a person's sense of arousal, calmness, fatigue, etc., and hardly giving a feeling of discomfort to a worker due to a change in light.SOLUTION: A lighting device includes a lighting unit having a light source obtained by combining at least two types of phosphor-containing LED devices that indicate light emission with different spectral distributions, and can gradually switch between types of illumination light with general color rendering indexes Ra different from each other by 3 or more within a chromaticity region of white light connecting coordinates A (0.32, 0.32), coordinates B (0.32, 0.34), coordinates C (0.34, 0.34), and coordinates D (0.34, 0.32) in a chromaticity coordinates of CIE1931.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a lighting device having a dimming function. [Background technology]

[0002] Conventionally, lighting devices with a dimming function that can adjust light to white or warm color according to personal preference are known. Also known are lighting devices that can adjust light to change a person's sense of alertness, calmness, fatigue, etc.

[0003] For example, Patent Document 1 below discloses a light source that emits light that gives a sense of brightness in a dark place, provides high visibility, and is less likely to cause fatigue, and in a region surrounded by the spectrum locus and line segments WB and WG that connect the coordinate W (0.33, 0.33) indicating an achromatic color, the coordinate B (0.091, 0.133) at 480 nm on the spectrum locus, and the coordinate G (0.373, 0.624) at 560 nm on the spectrum locus, the color purity of which is included in the region of 2 to 50, and the area occupied by continuous spectral wavelengths in the wavelength region of 480 to 540 nm is 15% or more of the spectral wavelength area of ​​the entire light source from 380 to 780 nm.

[0004] Also, although it is not related to fatigue, illumination light has been proposed that makes characters on paper easier to read by increasing the whiteness of the paper.As one such technique, the following Patent Document 2 discloses an illumination device equipped with a light source having solid-state light-emitting elements, the light source having spectral radiation characteristics with a correlated color temperature in the range of 5400 to 7000K, a color deviation in the range of Duv-6 to 8, and a chroma value, which is an index of vividness in copy paper, of 2.7 or less, calculated using a calculation method defined in the CIE1997 Interim Color Appearance Model (Simple Version).

[0005] Furthermore, the following Patent Document 3 discloses an environmental control system capable of implementing nap support with high nap effectiveness. Specifically, the environmental control system includes a first acquisition unit that acquires input information including behavior index information indicating a user's behavior, a determination unit that determines, from the input information according to a control content determination rule, control content for an environmental control device including a device that outputs light, which is control content for allowing the user to nap, a control unit that controls the environmental control device based on the determined control content, a second acquisition unit that acquires evaluation information indicating the user's evaluation of the control content, and an update unit that updates the control content determination rule by machine learning using a value based on the evaluation information as a reward. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2019-125577 A [Patent Document 2] JP 2014-075186 A [Patent Document 3] JP 2020-103508 A Summary of the Invention [Problem to be solved by the invention]

[0007] In conventional lighting devices that can adjust the light intensity to change a person's sense of alertness, calmness, fatigue, etc., when a person is performing various tasks under the light and the light intensity is adjusted to change the person's senses, the problem is that the light intensity is adjusted so that the person notices the change in light, causing a sense of discomfort to the person performing the task.

[0008] In order to solve the above-mentioned problems, the present invention aims to provide a lighting device that can adjust the brightness to change a person's sense of alertness, calmness, fatigue, etc., and that does not cause a worker to feel uncomfortable due to changes in light. [Means for solving the problem]

[0009] One aspect of the present invention is to provide a method for manufacturing a semiconductor device that emits light having different spectral distributions. S, a little At least two types Firefly The lighting device is equipped with a lighting section having a light source combining a phosphor-containing LED device, and is capable of gradually switching between types of lighting light having average color rendering indices Ra that differ by 3 or more within the white light chromaticity region connecting coordinates A (0.32, 0.32), coordinates B (0.32, 0.34), coordinates C (0.34, 0.34), and coordinates D (0.34, 0.32) in the CIE1931 chromaticity coordinates. With such a lighting device, it is possible to obtain a lighting device that can adjust the light to change a person's sense of awakening, sedation, fatigue, etc., and that does not cause discomfort due to changes in light to people working there. In addition, the use of a phosphor-containing LED device is preferable in that it is easy to obtain lighting light with a continuous spectral distribution that does not cause fatigue. The gradual switching includes switching between a first setting that provides illumination light with an average color rendering index Ra of 70 or more and less than 75, and a second setting that provides illumination light with an average color rendering index Ra of 75 or more and less than 80, and the illumination light of the second setting has an area ratio of a spectral distribution in the range of 460 nm to 500 nm of 1.2 or more and an area ratio of a spectral distribution in the range of 580 nm to 780 nm of less than 1.3, relative to the illumination light of the first setting. Alternatively, the gradual switching includes switching between a first setting that provides illumination light with an average color rendering index Ra of 70 or more and less than 75, and a third setting that provides illumination light with an average color rendering index Ra of 80 or more and less than 95, and the illumination light of the third setting has an area ratio of a spectral distribution in the range of 460 nm to 500 nm of 1.2 or more and an area ratio of a spectral distribution in the range of 580 nm to 780 nm of 1.3 or more, relative to the illumination light of the first setting.

[0010] The gradual switching is performed between a first setting that provides illumination light with an average color rendering index Ra of 70 or more and less than 75, and a second setting that provides illumination light with an average color rendering index Ra of 75 or more and less than 80. In addition to switching to The third facility provides lighting with an average color rendering index Ra of 80 or more and less than 95. Switch to fixed It is preferable that the light source contains the above compound because it is possible to easily adjust the light intensity to change between a feeling of awakening and a feeling of sedation. Alternatively, in addition to switching between the first setting which provides illumination light with an average color rendering index Ra of 70 or more and less than 75, and the third setting which provides illumination light with an average color rendering index Ra of 80 or more and less than 95, it is preferable to include switching to the second setting which provides illumination light with an average color rendering index Ra of 75 or more and less than 80, because this allows dimming that easily changes between a sense of awakening and a sense of calm. With such a lighting device, for example, during normal lighting, lighting that gives a feeling somewhere between an awakening and a calming feeling is turned on as a first setting, and when the user wishes to be awakened, the lighting is switched to a second setting, and when the user wishes to be calmed, the lighting is switched to a third setting, thereby making it possible to give the user a feeling of awakening or calming without making the user feel uncomfortable.

[0011] In addition, it is preferable that the gradual switching is performed according to an input value based on the user's biometric information, since the light can be automatically adjusted to a preferred level by reflecting the biometric information of each individual user. In such a case, it is preferable that the user's biometric information is based on an output value from a wearable computer that can acquire the biometric information, since the acquisition of the biometric information can be easily reflected in the dimming in real time. Effect of the Invention

[0012] According to the present invention, it is possible to provide a lighting device that can adjust the brightness to change a person's sense of alertness, calmness, fatigue, etc., and that does not cause a worker to feel uncomfortable due to changes in light. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a block diagram showing a configuration of a lighting system 100 using a lighting device 10 according to an embodiment. [Diagram 2] FIG. 2 is a schematic plan view of the illumination unit 1 which is an LED module. [Diagram 3] FIG. 3 is a schematic plan view of the LED device 30. As shown in FIG. [Figure 4] FIG. 4 is a schematic cross-sectional view of the LED device 30 shown in FIG. 3 along the line BB'. [Diagram 5] FIG. 5 is an explanatory diagram illustrating the effect obtained when the types of illumination light are switched stepwise between different types each having an average color rendering index Ra of 3 or more. [Figure 6] FIG. 6 shows the emission spectrum of the illumination light at each setting of the illumination device used in the examples. [Figure 7] FIG. 7 shows the coordinates of the chromaticity diagram of the CIE color system of the illumination light at each setting of the illumination device used in the examples. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the lighting device according to the present invention will be described with reference to the drawings. The lighting device of this embodiment is equipped with a lighting section having a light source combining at least two types of phosphor-containing LED devices that emit light with different spectral distributions, and is capable of gradually switching between types of illumination light whose average color rendering index Ra differs from each other by 3 or more within the chromaticity region of white light connecting coordinates A (0.32, 0.32), B (0.32, 0.34), C (0.34, 0.34), and D (0.34, 0.32) in the chromaticity coordinates of CIE1931.

[0015] 1 is a block diagram showing the configuration of a lighting system 100 using a lighting device 10 according to the present embodiment. The lighting system 100 is composed of the lighting device 10 and a control device 20. The control device 20 is a control device that instructs the lighting device 10 to switch the type of illumination light.

[0016] 1, the lighting device 10 includes a lighting unit 1, which is a light-emitting unit having a light source formed by combining at least two types of phosphor-containing LED devices that emit light with different spectral distributions. The lighting device 10 also includes at least a lighting control unit 2 for controlling switching between types of illumination light, a signal receiving unit 3 for receiving an instruction signal that specifies the type of illumination light, and an input power source 4 for supplying power to the lighting unit 1 via the lighting control unit 2.

[0017] The input power source 4 is a power source for supplying power to the lighting control unit 2. For example, when the lighting device 10 receives power from a commercial AC power source via an insertion plug or the like, the input power source 4 includes a DC-AC converter that converts AC power into DC power.

[0018] The control device 20 includes a signal transmitting unit 22 and a signal generating unit 21. The control device 20 may be powered by a battery or may be supplied with commercial AC power via a plug.

[0019] The signal transmitting unit 22 transmits the control command signal S generated by the signal generating unit 21 as described below to the signal receiving unit 3 of the lighting device 10. The transmission from the signal transmitting unit 22 to the signal receiving unit 3 may be by wired communication or wireless communication such as Bluetooth (registered trademark) or Wi-Fi (registered trademark).

[0020] The control command signal S transmitted from the signal transmitting unit 22 of the control device 20 is received by the signal receiving unit 3 of the lighting device 10. The control command signal S received by the signal receiving unit 3 is a command signal for controlling the lighting device 10 to switch the type of illumination light stepwise, as described below. In this embodiment, the control command signal S is generated by the signal generating unit 21 of the control device 20 based on, for example, biometric data of a user, as described below.

[0021] Based on the control command signal S received by the signal receiving unit 3, the illumination control unit 2 switches the type of illumination light in stages.

[0022] The lighting unit 1 is designed to be able to adjust the illumination light type to have average color rendering indexes Ra that differ by 3 or more within a white light chromaticity region connecting coordinates A (0.32, 0.32), coordinates B (0.32, 0.34), coordinates C (0.34, 0.34), and coordinates D (0.34, 0.32) in the CIE1931 chromaticity coordinates. Note that the CIE1931 chromaticity coordinates, spectral distribution, and average color rendering index are measured using, for example, a spectroradiometer (spectroradiometer CL-500A manufactured by Konica Minolta, Inc.), as described later.

[0023] Here, the average color rendering index Ra is a value that evaluates the color rendering, which is a characteristic of a light source, with respect to the effect that the illumination light has on the appearance of the object color, and indicates the average of the color rendering index for eight prescribed test colors. The difference in the average color rendering index Ra is strongly influenced by the spectral distribution of the wavelength of the illumination light. For example, two lights with the same color coordinates but different average color rendering indexes Ra are perceived by humans as the same color, but the spectral distribution of the light is different. By gradually switching the light so that the average color rendering index Ra of similar colors differs by 3 or more, it is possible to greatly change the spectral distribution of the illumination wavelength that humans cannot perceive without greatly changing the color that humans can perceive. With such a gradual switching, it is possible to affect people's sensibility by changing the spectral distribution that humans cannot perceive.

[0024] 2 is a schematic plan view of the illumination unit 1 which is an LED module, and the illumination unit 1 includes an LED mounting board 39 and three types of phosphor-containing LED devices 30a, 30b, and 30c which emit light with different spectral distributions and are mounted on the LED mounting board 39. Hereinafter, the phosphor-containing LED device will also be referred to simply as an LED device, and the three types of phosphor-containing LED devices 30a, 30b, and 30c will also be collectively referred to simply as an LED device 30.

[0025] As shown in FIG. 2, the illumination unit 1 includes three types of LED devices 30a, 30b, and 30c mounted on an LED mounting board 39, and includes multiple LED devices 30a, 30b, and 30c. In the illumination unit 1 shown in FIG. 2, 30 LED devices 30a, 30b, and 30c are mounted. The LED devices mounted in the illumination unit may include at least two types of LED devices that emit light with different spectral distributions, and the arrangement and number of each type of LED device are appropriately adjusted according to the light distribution and light quantity. The illumination unit may also be provided with a lens or a light diffusion layer to adjust the light distribution angle and light diffusion.

[0026] The LED devices 30a, 30b, and 30c of this embodiment contain phosphors with different compositions so as to emit light with different spectral distributions. Specifically, for example, the LED devices 30a, 30b, and 30c each include a blue LED element 31 having an emission peak wavelength in the range of 420 to 480 nm, and further include at least one phosphor selected from a YAG phosphor having a fluorescence peak wavelength in the range of 500 to 590 nm and a green phosphor having a fluorescence peak wavelength in the range of 430 to 530 nm, and the phosphor composition is adjusted so as to emit light with different spectral distributions. Here, the fluorescence peak wavelength is defined as the wavelength corresponding to the fluorescence peak intensity at which the fluorescence spectrum of the phosphor has the highest intensity.

[0027] Fig. 3 is a schematic plan view of the LED device 30, and Fig. 4 is a schematic cross-sectional view of the LED device 30 taken along line B-B' in Fig. 3. As shown in Fig. 4, the LED device 30 includes an LED device body 35 and a phosphor layer 38 that is a layer containing a phosphor.

[0028] The LED device body 35 is an LED light emitting device including a blue LED element 31, a package member 32 having a storage recess 32a for storing the blue LED element 31, and a transparent resin sealing material 34 for sealing the blue LED element 31 stored in the storage recess 32a. A reflective film 37 made of silver plating or the like is formed on the inner wall surface of the storage recess 32a. One electrode of the blue LED element 31 is connected to a lead 32b, and the other electrode of the blue LED element 31 is wire-bonded with a gold wire 36 and connected to a lead 32c, and the leads 32b and 32c are extended to the outside. The lead 32b is an anode, and the lead 32c is a cathode. The lead 32b of the LED device body 35 is connected to the positive side of a power source, and the lead 32c is connected to the negative side of the power source, and the blue LED element 31 emits light by applying power. In such an LED device body 35, the upper surface of the transparent resin sealing material 34 becomes the light emitting surface.

[0029] The blue LED element 31 is a blue LED chip having an emission peak wavelength in the blue region of 420 to 480 nm. Specific examples of the blue LED element include GaN-based elements. The transparent resin sealing material 34 seals and seals the blue LED element 31 accommodated in the accommodation recess 32a.

[0030] Examples of the transparent resin that forms the transparent resin sealing material include silicone resin, epoxy resin, acrylic resin, etc. The LED device body of this embodiment is a type called a surface mount device (SMD), but other types of LED devices such as a so-called bullet type, package type, chip-on-board type (COB type), etc. may be used instead of the SMD.

[0031] Phosphor layer 38 is a layer containing phosphor 33 arranged so as to cover the light emitting surface of LED device body 35. Phosphor 33 contained in phosphor layer 38 is excited by the light emitted by blue LED element 31 and emits fluorescence. Therefore, the spectral distribution of the light emitted from LED device 30 shows a spectral distribution that is a mixture of the light emitted by blue LED element 31 and the fluorescence of phosphor 33.

[0032] In this embodiment, a phosphor-containing cap is used as the phosphor layer 38. The phosphor-containing cap is manufactured by forming a sheet in which phosphor is uniformly dispersed in a light-transmitting resin into a cap shape. Specific examples of the light-transmitting resin include silicone rubber and epoxy resin. Instead of the phosphor-containing cap, the phosphor layer may be a phosphor-containing sheet embedded in a transparent resin encapsulant, or a resin layer formed by applying a light-transmitting resin composition containing phosphor to the light-emitting surface of the transparent resin encapsulant. The LED device may be one in which phosphor is dispersed in a transparent resin encapsulant that encapsulates an LED element.

[0033] It is preferable that the phosphor layer contains a YAG phosphor having a peak fluorescence wavelength in the range of 500 to 590 nm or a green phosphor having a peak fluorescence wavelength in the range of 430 to 530 nm, because this allows easy dimming adjustment to illumination light with average color rendering indexes Ra differing by 3 or more within the white light chromaticity region connecting coordinates A (0.32, 0.32), coordinates B (0.32, 0.34), coordinates C (0.34, 0.34), and coordinates D (0.34, 0.32).

[0034] A YAG phosphor having a fluorescent peak wavelength in the range of 500 to 590 nm is excited by the light emitted from a blue LED element and emits yellow light having a fluorescent peak wavelength in the range of 500 to 590 nm. Specific examples of such phosphors include cerium-activated YAG phosphors.

[0035] Also, a green phosphor having a fluorescent peak wavelength in the range of 430 to 530 nm is excited by the emission of a blue LED element and emits blue to green light or green to yellow light having a fluorescent peak wavelength in the range of 430 to 530 nm. Specific examples of such phosphors include silicate phosphors, LuAG phosphors (LAG phosphors), aluminate phosphors, europium-activated strontium aluminate phosphors (SAE phosphors), and sialon phosphors such as β-SiAlON:Eu.

[0036] The phosphor layer may contain other phosphors, colorants, and light diffusing materials other than the YAG phosphor and the green phosphor. Specific examples of other phosphors include red phosphors that emit reddish light having a peak wavelength in the range of 580 to 680 nm. Specific examples of such red phosphors include nitride phosphors, silicate phosphors, CaSn phosphors such as (Sr,Ca)CaAlSiN3:Eu and CaAlSiN3:Eu, and sialon phosphors. Specific examples of colorants include organic or inorganic pigments such as chrome green, chromium oxide, pigment green B, malachite green lake, fanal yellow green G, and phthalocyanine green as green pigments, white pigments such as titanium oxide, talc, and barium sulfate, and black pigments such as carbon black. Examples of light diffusing materials include silica and calcium carbonate.

[0037] The thickness of the phosphor layer 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 ratio of the phosphor dispersed in the phosphor layer is appropriately adjusted depending on the type of phosphor and the thickness of the phosphor layer, but as an example, when the phosphor layer is 100 μm thick, it is preferably blended with 10 to 300 parts by mass, more preferably 50 to 200 parts by mass, per 100 parts by mass of the light-transmitting resin.

[0038] The lighting unit 1 uses an LED module constructed by mounting the above-mentioned LED devices 30a, 30b, and 30c on an LED mounting board 39, and is designed to provide lighting within the chromaticity region of white light connecting coordinates A (0.32, 0.32), B (0.32, 0.34), C (0.34, 0.34), and D (0.34, 0.32) in the CIE 1931 chromaticity coordinates as lighting light, and to enable gradual switching between types of lighting light with average color rendering index (Ra) differing from each other by 3 or more, preferably by Ra 5 or more.

[0039] In order to configure such an illumination section 1, for example, as shown in FIG. 2, an LED module is used which combines a plurality of LED devices 30a mainly including a YAG phosphor having a peak fluorescence wavelength in the range of 500 to 590 nm, LED devices 30b including a green phosphor having a peak fluorescence wavelength in the range of 430 to 530 nm and a YAG phosphor having a peak fluorescence wavelength in the range of 500 to 590 nm, and LED devices 30c including a red phosphor having a peak wavelength in the range of 580 to 680 nm and a green phosphor having a peak fluorescence wavelength in the range of 430 to 530 nm.

[0040] 1, an input power source 4 is connected to the lighting unit 1, which is an LED module, via a lighting control unit 2. Each of the LED devices 30a, 30b, and 30c of the lighting unit 1 emits light using DC power supplied from the lighting control unit 2. The amount of DC power supplied to each of the LED devices 30a, 30b, and 30c of the lighting unit 1 is controlled by the lighting control unit 2 as follows.

[0041] The lighting control unit 2 controls the type, number, and current amount of the LED devices 30a, 30b, and 30c to emit light according to the type of control command signal S received by the signal receiving unit 3 described below. Furthermore, the lighting control unit 2 may control the illumination light of the illumination unit 1 to change the timing of turning the light on or off according to settings.

[0042] Specifically, the lighting control unit 2 controls the power supply so as to switch the type of illumination light from a predetermined first setting to a predetermined second setting, from the predetermined first setting to a predetermined third setting, or from the predetermined third setting to the predetermined second setting, for example, in accordance with the type of the control command signal S received by the signal receiving unit 3. Specifically, the lighting control unit 2 controls the type, number, and amount of current of the LED devices 30a, 30b, and 30c to emit light, by controlling the type, number, and amount of current of the LED devices 30a, 30b, and 30c to emit light, so as to emit light with a spectral distribution of the first setting when an instruction for the first setting is received by the control command signal S, light with a spectral distribution of the second setting when an instruction for the second setting is received by the control command signal S, and light with a spectral distribution of the third setting when an instruction for the third setting is received by the control command signal S.

[0043] In the lighting device of this embodiment, within the white light chromaticity region connecting coordinate A (0.32, 0.32), coordinate B (0.32, 0.34), coordinate C (0.34, 0.34), and coordinate D (0.34, 0.32) in the CIE 1931 chromaticity coordinates, the illumination light having a first setting of spectral distribution has an Ra of 70 or more and less than 75, the illumination light having a second setting of spectral distribution has an Ra of 75 or more and less than 80, and the illumination light having a third setting of spectral distribution has an Ra of 80 or more and less than 95.

[0044] For example, when the LED device 30a is mainly turned on, it is designed to emit illumination light of a first setting with Ra of 70 or more and less than 75. When the LED device 30b is mainly turned on, it is designed to emit illumination light of a second setting with Ra of 75 or more and less than 80. When the LED device 30c is mainly turned on, it is designed to emit illumination light of a third setting with Ra of 75 or more and less than 80.

[0045] In such a case, when the lighting control unit 2 receives an instruction for the first setting by the control command signal S, the LED device 30a is mainly turned on to illuminate with light of a type of spectral distribution in which Ra is 70 or more and less than 75, which is the first setting. When the lighting control unit 2 receives an instruction for the second setting by the control command signal S, the LED device 30b is mainly turned on to illuminate with light of a type of spectral distribution in which Ra is 75 or more and less than 80, which is the second setting. When the lighting control unit 2 receives an instruction for the third setting by the control command signal S, the LED device 30c is mainly turned on to illuminate with light of a type of spectral distribution in which Ra is 80 or more and less than 95, which is the third setting. Also, by combining the LED devices 30a and 30b in combination to be turned on, the LED devices 30a and 30c in combination to be turned on, the LED devices 30b and 30c in combination to be turned on, etc., it is possible to further switch between four or more stages of illumination.

[0046] As described later, in the white light chromaticity region connecting coordinates A (0.32, 0.32), coordinates B (0.32, 0.34), coordinates C (0.34, 0.34), and coordinates D (0.34, 0.32), when the first lighting setting, in which Ra is 70 or more and less than 75, was switched to the second lighting setting, in which Ra is 75 or more and less than 80, it was easy to wake up the subject. Also, when the first lighting setting, in which Ra is 70 or more and less than 75, was switched to the third lighting setting, in which Ra is 80 or more and less than 95, it was easy to make the subject feel drowsy and calm him down.

[0047] Therefore, as shown in Fig. 5, by switching from the first setting to the third setting, or from the first setting to the second setting, or from the third setting to the second setting, etc., it is possible to change a person's sense of alertness or calmness. By gradually switching between types of illumination light with different Ra values ​​of 3 or more within the chromaticity region of white light connecting coordinates A (0.32, 0.32), B (0.32, 0.34), C (0.34, 0.34), and D (0.34, 0.32) in the CIE1931 chromaticity coordinates, it is difficult for the visual sense of color difference to be sensed by the change in light type, and therefore the person working is unlikely to feel uncomfortable.

[0048] It is preferable that the illumination light of such a second setting has an area ratio of the spectral distribution in the range of 460 nm to 500 nm of 1.2 or more and an area of ​​the spectral distribution in the range of 580 nm to 780 nm of less than 1.3 to the illumination light of the first setting, since this results in a spectral distribution that is more likely to wake up the user than the illumination light of the first setting. It is also preferable that the illumination light of the third setting has an area ratio of the spectral distribution in the range of 460 nm to 500 nm of 1.2 or more and an area of ​​the spectral distribution in the range of 580 nm to 780 nm of 1.3 or more to the illumination light of the first setting, since this results in a spectral distribution that is more likely to calm the user than the illumination light of the first setting.

[0049] The control device 20 is a device that transmits a control command signal S to a signal receiving unit 3 of the lighting device 10, thereby controlling the lighting unit 1 of the lighting device 10 to emit light that is gradually switched to illumination light according to the instruction of the control command signal S to the lighting control unit 2. Referring to FIG. 1, the control device 20 includes a signal generating unit 21 that generates the control command signal S, and a signal transmitting unit 22 that transmits the control command signal S.

[0050] The signal generating unit 21 generates a control command signal S for controlling the illumination light emitted by the illumination unit 1. For example, the signal generating unit 21 may generate a control command signal S that instructs the user to switch from a first lighting setting of standard light to a second lighting setting having a waking effect by using a dimmer switch when the user feels tired and wants to be awakened, and to switch from the first lighting setting of standard light to a third lighting setting having a sedative effect by using a dimmer switch when the user feels tired and wants to be calmed down.

[0051] Furthermore, the signal generating unit 21 may generate a control command signal S that gives an instruction according to a setting previously associated with a parameter of the biological information, based on the input biological information data.

[0052] Here, the user's biometric data refers to various vital sign data such as heart rate information (heart rate waveform, heart rate interval, heart rate, LF / HF, etc.), percutaneous arterial oxygen saturation (SpO2), body surface temperature, blood pressure, electroencephalogram, and oxyHb concentration using near-infrared spectroscopy (NIRS).

[0053] The means for collecting the biometric data is not particularly limited, but may include a wearable sensor such as a wearable heart rate sensor equipped with a sensor that can collect biometric data in real time when worn by a user, or a wearable computer such as a smart watch or smartphone equipped with a wearable sensor function. The biometric data may be acquired automatically without being selected by the user. In addition, the control device 20 itself may be equipped with a sensor that collects the biometric data. In addition, the control device 20 may acquire the biometric data accumulated in the cloud server from a wearable computer, rather than acquiring the biometric data from a sensor that collects the biometric data.

[0054] The signal generating unit 21 may, for example, prepare a table in which parameters based on bio-information data are associated with types of illumination light, and when a parameter based on bio-information data measured in real time is input, generate a control command signal S that instructs the type of illumination light to be switched to the type associated with that parameter.

[0055] Also, an artificial intelligence (AI) may be trained in advance to learn what type of illumination light tends to wake or calm the user, and the artificial intelligence (AI) may be made to select a suitable type of illumination based on inputted bioinformation data, thereby generating a control command signal S that instructs the user to switch to a different type of illumination light. Note that the machine learning or other AI may be a method of constructing a model for each individual user, and generating a control command signal S to grasp the current state of the user from the individual model using bioinformation data and reflecting the grasped state in the settings.

[0056] Such lighting systems are used, for example, in homes, offices, stores, cars, etc., and the lighting devices are room lights, desk lights, task lights, office lighting, indirect lighting, etc., and are used to illuminate users and their working environments. EXAMPLES

[0057] The present invention will be described in more detail below with reference to examples. However, the scope of the present invention is not limited to the examples. [Manufacturing of phosphor-containing LED devices] The phosphor-containing LED device used in this example will be described.

[0058] Silicone rubber compositions containing phosphors F1 to F6 (all manufactured by Nichia Corporation) and light diffusing material D (calcium carbonate) uniformly dispersed in silicone rubber were prepared according to the formulation shown in Table 1 below, and each composition was hot-press molded to produce phosphor-containing caps CAP1 to CAP3 with a thickness of 0.3 mm.

[0059] [Table 1]

[0060] Then, one of the phosphor-containing caps (CAP1 to CAP3) was attached to the light-emitting surface of the blue LED device with a silicone adhesive to manufacture phosphor-containing LED devices A to C. The blue LED device used was "NFSC172C (emission peak wavelength: 445 nm)" (manufactured by Nichia Corporation). [Evaluation of chromaticity coordinates, spectral distribution, general color rendering index, and illuminance] The CIE1931 chromaticity coordinates, spectral distribution, general color rendering index, illuminance, correlated color temperature, and color temperature deviation dv were measured using a spectroradiometer (Konica Minolta CL-500A spectroradiometer). [Creating the lighting device] As shown in FIG. 2, 30 pieces of each of the phosphor-containing LED devices A to C, each of which has a different spectral distribution, were mounted on a circular LED mounting board with a diameter of 20 cm. A dimming control unit was mounted on the LED mounting board so that the phosphor-containing LED devices A to C were treated as separate groups and could be turned on, off, and the amount of current could be adjusted. In this way, a lighting device equipped with a lighting unit and a dimming control unit was constructed. This lighting device can be switched between three settings in the range of illuminance 500 to 1200 lx (lux): a first setting in which only the group of phosphor-containing LED devices A is turned on to provide illumination light with Ra of 70 or more and less than 75; a second setting in which only the group of phosphor-containing LED devices B is turned on to provide illumination light with Ra of 75 or more and less than 80; and a third setting in which only the group of phosphor-containing LED devices C is turned on to provide illumination light with Ra of 80 or more and less than 95. The lighting device further includes a signal receiving unit. In this way, a table lamp-type lighting device equipped with an illumination unit as shown in FIG. 2 was produced.

[0061] Table 2 shows the optical characteristics of the manufactured lighting device at illumination light illuminances of 500 lx and 1000 lx when the lighting device was switched to the first, second, or third setting.

[0062] [Table 2]

[0063] The emission spectra when switched to the first, second, or third setting are shown in Fig. 6, and the coordinates on the chromaticity diagram of the CIE color system are shown in Fig. 7. Table 3 shows the ratio of the area of ​​the spectral distribution of each wavelength region of the illumination in the second or third setting to the area of ​​the spectral distribution of each wavelength region of the illumination in the first setting.

[0064] [Table 3]

[0065] [Acquisition of biological information and switching of illumination light] As biological information, changes in the user's body surface temperature and heart rate were obtained using a wearable heart rate sensor (myBeat, manufactured by Union Tool Co., Ltd.). The wakefulness and sedation states were determined from the changes in body surface temperature and heart rate. When transitioning from the wakefulness state to the sedated state, the heart rate decreases, the beat-to-beat interval (RRI) increases, and the user's body surface temperature rises.

[0066] The changes in the user's body surface temperature and heart rate measured by the wearable heart rate sensor were monitored while being received by a personal computer using a dedicated application. Then, when the user transitioned from an awake state to a sedated state due to an increase in the heart rate interval (RRI) and an increase in the body surface temperature, a command signal was sent from the personal computer to a signal receiving unit of the lighting device via wireless communication to switch the lighting from a first setting of chromaticity (0.333, 0.335) and illuminance of 513.8 lx to a second setting of chromaticity (0.334, 0.332) and illuminance of 511.4 lx. Also, when the user transitioned from a sedated state to an awake state due to a decrease in the heart rate interval and a decrease in the body surface temperature, a command signal was sent from the personal computer to a signal receiving unit of the lighting device via wireless communication to switch the lighting from the first setting to a third setting of chromaticity (0.331, 0.333) and illuminance of 507.1 lx. [Lighting system evaluation] Using a lighting system consisting of the above-mentioned lighting device and control device, changes in lighting were evaluated. Five subjects in their twenties were recruited as one group. A table with a square surface of 400 x 400 mm and a chair were placed in a dark room, and the above-mentioned lighting device was placed on the table. A wearable heart rate sensor was attached to the subject, and the height of the table and chair were adjusted so that the visual distance between the subject and the printed matter placed on the table when the subject sat on the chair was 450 mm, and the position of the eyes was adjusted. The purpose of the experiment was not informed to the subjects.

[0067] A group of subjects were seated in a chair in a dark room and kept quiet for one minute. Then, the lighting device was turned on with the first setting, and the subjects were asked to read a printed material silently for 30 minutes. While the subjects were reading silently, the changes in heart rate interval and body surface temperature were received from the wearable heart rate sensor. The lighting device's lighting was then switched from the first setting to the second setting. After detecting a decrease of 5% or more in the heart rate interval of four or more subjects as a result of the switch, it was confirmed that the subjects had woken up.

[0068] Similarly, another group of subjects were seated in a chair and kept quiet for one minute. Then, the lighting device was illuminated with the first setting of illumination light, and the subjects were made to read a printed material silently for 30 minutes. While reading silently, changes in heart rate intervals and body surface temperature were received from the wearable heart rate sensor. Then, the lighting device's illumination light was switched from the first setting to the third setting of illumination light. After the switch, the heart rate intervals of four or more subjects increased by 5% or more, confirming that the subjects had calmed down.

[0069] Each subject in each group was then asked to make the following subjective judgment based on their sense of alertness (improved motivation to read and ability to concentrate) and sense of calmness (sleepiness). (First group) A: Switching from the first setting to the second setting made me feel more alert. B: No change in feeling of alertness or sedation (sleepiness) was felt by switching from the first setting to the second setting. C: Switching from the first to the second setting increased the feeling of sedation. (Second group) D: Switching from setting 1 to setting 3 resulted in increased alertness. E: No change in feeling of alertness or sedation (sleepiness) was felt by switching from setting 1 to setting 3. F: Switching from setting 1 to setting 3 resulted in increased feeling of sedation.

[0070] According to the judgment of the first group, four out of five people rated it as A, and it was confirmed that there was a tendency for the sense of awakening to increase by switching from the first setting to the second setting. Also, according to the judgment of the second group, four out of five people rated it as F, and it was confirmed that there was a tendency for the sense of sedation to increase by switching from the first setting to the third setting.

[0071] In addition, a total of 10 subjects from each group were asked to make the following subjective judgments regarding the discomfort caused by changes in lighting (changes in the color of printed matter). A: There was no discomfort when switching from the first setting to the second or third setting. B: I felt uncomfortable switching from the first setting to the second or third setting.

[0072] According to the above judgment, 9 out of 10 people judged it as A, and it was confirmed that there was a tendency that switching from the first setting to the second or third setting did not cause any discomfort.

[0073] According to the results of the above embodiment, in the chromaticity region of white light connecting coordinate A (0.32,0.32), coordinate B (0.32,0.34), coordinate C (0.34,0.34), and coordinate D (0.34,0.32) in the CIE1931 chromaticity coordinates, by gradually switching between different types of illumination with Ra of 3 or more, the subject did not feel uncomfortable. And by switching from the first setting, which provides illumination with Ra of 70 or more and less than 75, to the second setting, which provides illumination with Ra of 75 or more and less than 80, the subject felt more alert. On the other hand, by switching from the first setting to the third setting, which provides illumination with Ra of 80 or more and less than 95, the subject felt more sedated. [Explanation of symbols]

[0074] 1. Lighting section 2 Lighting control section 3. Signal receiving section 4 Power Inputs 10. Lighting Equipment 20 Control device 21 Signal Generation Unit 22 Signal transmitter 30 Phosphor-containing LED device 30a Phosphor-containing LED device A 30b Phosphor-containing LED device B 30c LED device containing phosphor C 31 Blue LED element 32 Packaging materials 32a Recessed portion 32b Lead 32c Lead 33 Phosphor 34 Transparent resin encapsulant 35 Device body 36 gold wire 37 Reflective film 38 Phosphor layer 39 LED mounting board 100 Lighting System

Claims

1. An illumination unit including a light source combining at least two types of phosphor-containing LED devices that emit light with different spectral distributions, In the CIE 1931 chromaticity coordinates, within a white light chromaticity region connecting coordinates A (0.32, 0.32), coordinates B (0.32, 0.34), coordinates C (0.34, 0.34), and coordinates D (0.34, 0.32), it is possible to gradually switch between types of illumination light whose general color rendering index Ra differs from each other by 3 or more; the gradual switching includes switching between a first setting that provides illumination light having an average color rendering index Ra of 70 or more and less than 75, and a second setting that provides illumination light having an average color rendering index Ra of 75 or more and less than 80; an area ratio of a spectral distribution of the second setting illumination light to that of the first setting illumination light in a range of 460 nm to 500 nm is 1.2 or more, and an area ratio of a spectral distribution of the second setting illumination light to that of the first setting illumination light in a range of 580 nm to 780 nm is less than 1.

3.

2. the gradual switching further includes switching to a third setting that provides illumination light having an average color rendering index Ra of 80 or greater but less than 95; 2. The illumination device according to claim 1, wherein the third setting illumination light has an area ratio of a spectral distribution in a range of 460 nm to 500 nm of 1.2 or more and an area ratio of a spectral distribution in a range of 580 nm to 780 nm of 1.3 or more relative to the first setting illumination light.

3. The lighting device according to claim 2 , wherein the lighting device is switched to the second setting when a user desires to be alert, and is switched to the third setting when the user desires to be calm.

4. 4. The lighting device according to claim 1, wherein the gradual switching is performed in response to an input value based on biometric data of a user.

5. The lighting device according to claim 4 , wherein the biometric information of the user is based on an output value from a wearable computer capable of acquiring biometric information.

6. An illumination unit having a light source combining at least two types of phosphor-containing LED devices that exhibit light emission with different spectral distributions, In the CIE 1931 chromaticity coordinates, within a white light chromaticity region connecting coordinates A (0.32, 0.32), coordinates B (0.32, 0.34), coordinates C (0.34, 0.34), and coordinates D (0.34, 0.32), it is possible to gradually switch between types of illumination light whose general color rendering index Ra differs from each other by 3 or more; the gradual switching includes switching between a first setting that provides illumination light having an average color rendering index Ra of 70 or more and less than 75, and a third setting that provides illumination light having an average color rendering index Ra of 80 or more and less than 95; an area ratio of a spectral distribution of the third set of illumination light to that of the first set of illumination light in a range of 460 nm to 500 nm is 1.2 or more, and an area ratio of a spectral distribution of the third set of illumination light to that of the first set of illumination light in a range of 580 nm to 780 nm is 1.3 or more.

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