Light source module and lighting fixture

Abstract

A light source module that emits output light is provided with a first light emitting unit (10) that emits first light and a second light emitting unit (20) that emits white second light. The first light-emitting section (10) has a first light-emitting element (11). The second light-emitting section (20) has a second light-emitting element (21) and a phosphor (22), and the phosphor (22) emits light when excited by light from the second light-emitting element (21). The output light includes first light and second light. The wavelength of the emission peak of the first light-emitting element (11) is 350 nm or more and 410 nm or less and is shorter than the wavelength of the emission peak of the second light-emitting element (21). The excitation spectrum of the phosphor (22) is in the wavelength range of 350 nm or more and 410 nm or less, and the wavelength range in which the first light-emitting element (11) has the light emission intensity has a minimum value.

Description

Technical Field

[0001] The invention relates to a light source module and a lighting device. Background Art

[0002] Patent Document 1 discloses a light source module including a violet LED (Light Emitting Diode) and a white LED.

[0003] (Prior art literature)

[0004] (Patent Document)

[0005] Patent Document 1: Japanese Patent Application No. 2019-525413 Summary of the invention

[0006] Problems to be solved by the invention

[0007] Reports in recent years have suggested that purple light has an inhibitory effect on human myopia. However, in the prior art, there is no disclosure of the structure of an appropriate light source module when using light containing a purple component for illuminating a person.

[0008] An object of the present invention is to provide a light source module and a lighting fixture capable of efficiently emitting output light including a violet component.

[0009] Means for solving problems

[0010] A light source module involved in one embodiment of the present invention is a light source module that emits output light, and the light source module comprises: at least one purple light-emitting portion, the purple light-emitting portion having a first light-emitting element for emitting a first light; and at least one white light-emitting portion, the white light-emitting portion having a second light-emitting element and a phosphor, the white light-emitting portion being used to emit a white second light, the phosphor being a phosphor that emits light through excitation by light from the second light-emitting element, the output light including the first light and the second light, the wavelength of the emission peak of the first light-emitting element being between 350 nm and 410 nm, which is shorter than the wavelength of the emission peak of the second light-emitting element, and the excitation spectrum of the phosphor having a minimum value in the wavelength range between 350 nm and 410 nm and in the wavelength range in which the first light-emitting element has emission intensity.

[0011] A lighting fixture according to one aspect of the present invention includes: the above-mentioned light source module; and a lighting circuit that supplies power for lighting the light source module to the light source module.

[0012] Effects of the Invention

[0013] According to the present invention, it is possible to provide a light source module and a lighting fixture that can efficiently emit output light including a violet component. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a perspective view showing an example of the appearance of a lighting fixture including the light source module according to the first embodiment.

[0015] Figure 2 This is a block diagram showing the structure of the lighting fixture according to Embodiment 1.

[0016] Figure 3 This is a plan view showing a light source module according to Embodiment 1.

[0017] Figure 4 This is a cross-sectional view showing a part of the light source module according to Embodiment 1.

[0018] Figure 5 This is a diagram showing an example of the spectrum of the first light emitted by the first light emitting section according to Embodiment 1.

[0019] Figure 6 This is a diagram showing an example of the spectrum of the second light emitted by the second light emitting section according to Embodiment 1.

[0020] Figure 7 This is a diagram showing an example of the excitation spectrum of the phosphor included in the second light-emitting portion according to Embodiment 1.

[0021] Figure 8 This is a diagram showing an example of the spectrum of output light emitted by the light source module according to the first embodiment.

[0022] Fig. 9 This is a plan view showing a light source module according to a modification of the first embodiment.

[0023] Fig.10 This is a block diagram showing the structure of a lighting fixture according to Embodiment 2.

[0024] Fig.11 This is a diagram showing an example of the spectrum of output light emitted by the light source module according to Embodiment 2 and the spectrum of sunlight having the same correlated color temperature as the output light.

[0025] Fig.12 This is a block diagram showing the configuration of a lighting fixture according to a modified example of the second embodiment.

[0026] Fig.13 This is an xy chromaticity diagram of the CIE1931 color space for explaining an example of changes in the correlated color temperature of output light in the lighting fixture involved in the modification of the second embodiment. DETAILED DESCRIPTION

[0027] The light source module and lighting fixture involved in the embodiments of the present invention are described in detail below using the accompanying drawings. In addition, the embodiments described below all illustrate a specific example of the present invention. Therefore, the numerical values, shapes, materials, components, configuration positions of components, connection methods, steps, order of steps, etc. shown in the following embodiments are all examples, and their purpose is not to limit the present invention. Among the components of the following embodiments, the components that are not recorded in the independent technical solutions are described as arbitrary components.

[0028] In addition, each figure is a schematic diagram and is not a strict illustration. Therefore, for example, the scale in each figure is not consistent. In addition, in each figure, the same symbols are marked for substantially the same structure, and repeated descriptions are omitted or simplified.

[0029] In the present specification, terms indicating the relationship between elements, terms indicating the shapes of elements, and numerical ranges are not only expressions in a strict sense but also expressions having substantially the same range, for example, expressions including a difference of about several percent.

[0030] In the present specification, ordinal numbers such as “first” and “second” do not refer to the number or order of components unless otherwise specified, but are used to distinguish components of the same kind to avoid confusion.

[0031] In addition, in this specification, the value of the color deviation Duv is the value of the Duv marked by the color deviation on the black body radiation locus determined by JIS Z8725, in other words, it is 1000 times the value of duv. In other words, in this specification, the value of the color deviation Duv is set to 1000 times the value of duv based on JIS Z8725 unless otherwise specified.

[0032] (Implementation Method 1)

[0033] [constitute]

[0034] First, regarding the configuration of the light source module and the lighting fixture according to Embodiment 1, Figures 1 to 4 To explain.

[0035] Figure 1 It is a perspective view showing an example of the appearance of a lighting fixture 100 including the light source module 50 according to the present embodiment. Figure 2 It is a block diagram showing the structure of the lighting fixture 100 according to the present embodiment. Figure 3 1 is a plan view showing a light source module 50 according to the present embodiment. Figure 4 is a cross-sectional view showing a part of the light source module 50 according to the present embodiment. Figure 4 Shown along Figure 3 Cross section of line IV-IV.

[0036] Figure 1 The lighting fixture 100 shown is, for example, a desk lamp. Figure 2 As shown, the lighting fixture 100 includes a light source module 50 and a lighting circuit 70. Furthermore, the lighting fixture 100 also includes, for example, a head frame for accommodating the light source module 50, an arm for supporting the head, and a main body on which the arm is installed. The lighting fixture 100 receives power provided by a power supply device such as a commercial power supply, and irradiates the output light emitted by the light source module 50 through the power as illumination light. In addition, the lighting fixture 100 can be any lighting fixture as long as it is used for lighting, and there is no special limitation. The lighting fixture 100 can be any one of a ceiling lamp, a basic lamp, a spotlight, a downlight, a chandelier, a wall lamp, a floor lamp, and the like. Furthermore, the lighting fixture 100 is, for example, a residential lighting fixture installed in a children's room, a bedroom, a living room, a study, etc., but it can also be a lighting fixture used in offices, shops, commercial facilities, factories, and the like.

[0037] The light source module 50 emits output light used for illumination. The color of the output light is, for example, white. Figure 3 As shown, the light source module 50 includes a substrate 1, a first light emitting unit 10, and a second light emitting unit 20. In this embodiment, the light source module 50 includes a plurality of first light emitting units 10 and a plurality of second light emitting units 20. The first light emitting unit 10 is an example of a purple light emitting unit, and the second light emitting unit 20 is an example of a white light emitting unit. Figure 3 In order to distinguish the first light-emitting section 10 from the second light-emitting section 20, a dot pattern is given to the first light-emitting section 10, but this does not mean that the first light-emitting section 10 has a dot pattern.

[0038] Each of the first light emitting unit 10 and the second light emitting unit 20 is a surface mount type (SMD: Surface Mount Device) light emitting module.

[0039] The first light emitting unit 10 emits a first light. The second light emitting unit 20 emits a second light. The output light emitted by the light source module 50 includes the first light emitted by all the first light emitting units 10 of the light source module 50 and the second light emitted by all the second light emitting units 20 of the light source module 50. In other words, the output light of the light source module 50 is a mixed light of the first light and the second light. In the output light, the sum of the radiant energy of the second light emitted by all the second light emitting units 20 is, for example, greater than the sum of the radiant energy of the first light emitted by all the first light emitting units 10.

[0040] The plurality of first light emitting units 10 and the plurality of second light emitting units 20 are arranged, for example, separately from each other on the substrate 1. Figure 3 In the example shown, a plurality of first light-emitting units 10 and a plurality of second light-emitting units 20 are arranged in a row at equal intervals and regularly. The number of the second light-emitting units 20 is, for example, greater than the number of the first light-emitting units 10. In addition, the number and arrangement of the first light-emitting units 10 and the second light-emitting units 20 are not particularly limited. The first light-emitting units 10 and the second light-emitting units 20 can be arranged in two or more rows, or arranged in a ring, or arranged with grid points in a prescribed grid shape. Furthermore, the number of at least one of the first light-emitting units 10 and the second light-emitting units 20 can be one. Regarding the arrangement of the first light-emitting unit 10 and the second light-emitting unit 20, for example, several arrangement patterns can be prepared, and after evaluating the radiation characteristics of light for each arrangement pattern, the best arrangement pattern can be selected to determine the arrangement.

[0041] The plurality of first light emitting units 10 and the plurality of second light emitting units 20 are mounted on the substrate 1 so that the same amount of current flows, for example. Alternatively, the plurality of first light emitting units 10 and the plurality of second light emitting units 20 may be mounted on the substrate 1 independently so that current flows separately.

[0042] The substrate 1 is a mounting substrate for mounting the first light emitting unit 10 and the second light emitting unit 20. The substrate 1 is provided with metal wiring (not shown) for supplying power to the first light emitting unit 10 and the second light emitting unit 20. The substrate 1 is, for example, a ceramic substrate made of ceramic, a resin substrate made of resin, or an insulating substrate such as a glass substrate. Alternatively, the substrate 1 may be a metal base substrate (metal substrate) in which an insulating film is coated on a metal plate.

[0043] like Figure 4 As shown, the first light-emitting unit 10 includes a first light-emitting element 11, a sealing member 15, and a package 17. The first light-emitting unit 10, for example, does not include a fluorescent body, but emits the light emitted by the first light-emitting element 11 as the first light. The first light is light having an intensity in the wavelength range of the purple component and containing a purple component, for example, purple light. Since the first light is light containing a purple component, the effect of suppressing myopia of a person can be obtained by using the output light for lighting, for example. In addition, in the present specification, the wavelength range of the purple component can be regarded as, for example, a wavelength range of more than 350nm and less than 410nm.

[0044] The first light emitting element 11 is, for example, an LED chip, and is disposed in the concave portion of the package 17. The wavelength of the emission peak of the first light emitting element 11 is, for example, greater than 350 nm and less than 410 nm, or may be greater than 360 nm and less than 400 nm. Furthermore, the wavelength of the emission peak of the first light emitting element 11 is shorter than the wavelength of the emission peak of the second light emitting element 21.

[0045] The sealing member 15 is a light-transmitting resin material that seals the first light-emitting element 11. The light-transmitting resin material is not particularly limited as long as it can transmit the light emitted by the first light-emitting element 11. For example, silicone resin, epoxy resin, or urea resin can be used as the light-transmitting resin material.

[0046] The package 17 is a container formed into a predetermined shape using, for example, a resin material, and is provided with wiring (not shown) connected to the first light emitting element 11 .

[0047] like Figure 4 As shown, the second light emitting unit 20 includes a second light emitting element 21, a phosphor 22, a sealing member 25, and a package 27. The second light emitting unit 20 emits a mixture of light emitted by the second light emitting element 21 (specifically, light emitted by the second light emitting element 21 that is not absorbed by the phosphor 22) and light emitted by the phosphor 22 as white second light. In addition, in this specification, white light refers to a light color for lighting along a black body radiation locus or a synthetic daylight locus within the range of daylight color (symbol D), daylight white (symbol N), white (symbol W), warm white (symbol WW), and bulb color (symbol L), or having a correlated color temperature above or below the range, and does not refer to the narrow range of white (symbol W) in the chromaticity distinction of light color. The color deviation Duv of the second light and the output light is, for example, greater than -10 and less than +10.

[0048] The second light emitting element 21 is, for example, an LED chip, and is disposed in the recess of the package 27. The second light emitting element 21 has a peak emission wavelength of, for example, 410 nm to 500 nm, or 420 nm to 470 nm. The second light emitting element 21 emits, for example, blue light.

[0049] The phosphor 22 is excited by a part of the light emitted by the second light emitting element 21, and radiates light with a longer wavelength than the light emitted by the second light emitting element 21. The phosphor 22, for example, emits green light with a wavelength of a luminescence peak of more than 500nm and less than 570nm. The phosphor 22 is dispersed in the sealing member 25. The phosphor 22 is, for example, an yttrium aluminum garnet (YAG) phosphor or a lutetium aluminum garnet (LuAG) phosphor. By using these phosphors, it is possible to easily adjust the wavelength representing a minimum value in the excitation spectrum of the phosphor 22 described later. For example, by adjusting the constituent elements of the phosphor 22, the band gap of the phosphor 22 changes, so that the excitation spectrum of the phosphor 22 can be adjusted. In addition, the color of the light emitted by the phosphor 22 is not limited to green, but may also be a color other than green, such as yellow or red. In addition, the second light emitting unit 20 may further include other phosphors, which are phosphors having a wavelength of a luminescence peak different from that of the phosphor 22 in order to adjust the light color of the second light.

[0050] The sealing member 25 is a translucent resin material that seals the second light emitting element 21. The translucent resin material is not particularly limited as long as it can transmit the light emitted by the second light emitting element 21 and the phosphor 22. For example, silicone resin, epoxy resin, or urea resin can be used as the translucent resin material.

[0051] The package 27 is a container formed into a predetermined shape using a resin material, for example, and a wiring (not shown) connected to the second light emitting element 21 is provided in the package 27 .

[0052] By adjusting at least one of the output characteristics of the second light emitting element 21 and the type and amount of the phosphor 22 , the second light emitted by the second light emitting unit 20 is adjusted to a desired light color.

[0053] In addition, the first light-emitting unit 10 may not include the package 17, the second light-emitting unit 20 may not include the package 27, and the first light-emitting element 11 and the second light-emitting element 21 may be directly mounted on the substrate 1. In other words, the light source module 50 may be a COB (Chip On Board) type module in which the first light-emitting element 11 and the second light-emitting element 21 are directly mounted on the substrate 1.

[0054] The lighting circuit 70 is a circuit for lighting the light source module 50 by supplying power to the light source module 50. The lighting circuit 70 supplies predetermined power (DC current) to the first light emitting unit 10 and the second light emitting unit 20. The lighting circuit 70 includes, for example, a circuit for converting AC current supplied from a commercial power supply into DC current.

[0055] In addition, the lighting fixture 100 may further include a control unit (control circuit) that performs dimming and color adjustment of the output light of the light source module 50. The control unit, for example, controls the power supplied to the light source module 50 by the lighting circuit 70. In addition, the lighting fixture 100 may further include an operation receiving unit such as a switch or an input panel for receiving an operation on the lighting fixture 100 and a communication module for remote operation.

[0056] [Spectra of First Light, Second Light, and Output Light, and Excitation Spectrum of Phosphor]

[0057] Next, regarding the spectra of the first light, the second light, and the output light, and the excitation spectrum of the phosphor 22, the Figures 5 to 8 Provide explanation.

[0058] Figure 5 1 is a diagram showing an example of the spectrum of the first light emitted by the first light emitting unit 10 according to the present embodiment. Figure 6 1 is a diagram showing an example of the spectrum of the second light emitted by the second light emitting unit 20 according to the present embodiment. Figure 7 This is a diagram showing an example of the excitation spectrum of the phosphor 22 included in the second light-emitting section 20 according to the present embodiment. Figure 8 is a diagram showing an example of the spectrum of output light emitted by the light source module 50 according to the present embodiment. Figures 5 to 8 In the figure, the horizontal axis represents the wavelength (unit: nm). Figure 5 , Figure 6 as well as Figure 8 In the figure, the vertical axis represents the luminous intensity normalized with the maximum value as 1. Figure 5 , Figure 6 as well as Figure 8 The spectrum normalized for the radiant flux (unit: W / nm) at each wavelength is shown in FIG. Figure 7 The middle vertical axis represents the excitation intensity normalized with the maximum value being 1. In addition, the excitation spectrum and absorption spectrum of a phosphor are generally substantially the same.

[0059] like Figure 5 As shown, the spectrum of the first light includes the luminous peak of the light emitted by the first light-emitting element 11. In this embodiment, the spectrum of the first light is, for example, the same as the spectrum of the light emitted by the first light-emitting element 11. Figure 5 The spectrum shown can be said to be the spectrum of the light emitted by the first light-emitting element 11. Figure 5 In the example shown, the wavelength of the emission peak of the first light emitting element 11 is about 380 nm, and the half width of the emission peak is about 10 nm. In the light emitted by the first light emitting element 11, that is, the first light, the total emission intensity is included in the wavelength range of the purple component, for example.

[0060] In addition, since the first light-emitting unit 10 includes a phosphor and the like, the first light may also have a luminous intensity or a luminous peak outside the wavelength range of the purple component (for example, on a longer wavelength side than the purple component). When the first light has a luminous intensity or a luminous peak outside the wavelength range of the purple component, the maximum value of the luminous intensity or the luminous intensity at the luminous peak is, for example, less than half of the luminous intensity at the luminous peak of the light emitted by the first light-emitting element 11. Furthermore, when the first light has a luminous intensity or a luminous peak outside the wavelength range of the purple component, for example, the radiant flux in the wavelength range of the purple component in the first light may be more than 1 times, or more than 2 times, the radiant flux outside the wavelength range of the purple component in the first light.

[0061] like Figure 6 As shown in FIG. 1 , the spectrum of the second light includes the emission peak of the light emitted by the second light emitting element 21 and the emission peak of the light emitted by the phosphor 22 in a wide range. Figure 6 FIG. 4 shows the spectrum of the second light when the correlated color temperature is 5000K. Figure 6 In the example shown, the wavelength of the emission peak of the second light emitting element 21 is about 450 nm, and the half width of the emission peak is about 20 nm. Also, the wavelength of the emission peak of the light emitted by the phosphor 22 is about 580 nm.

[0062] like Figure 7 As shown, the excitation spectrum of the phosphor 22 has a minimum value in the wavelength range of 350 nm to 410 nm and the wavelength range in which the first light-emitting element 11 has a light emission intensity. For example, when a phosphor 22 emitting green light is used, the excitation intensity of the phosphor 22 tends to decrease in the wavelength range of 350 nm to 410 nm and the wavelength range in which the first light-emitting element 11 has a light emission intensity. In addition, the excitation spectrum of the phosphor 22 may also have a minimum value in the wavelength range of 360 nm to 400 nm and the wavelength range in which the first light-emitting element 11 has a light emission intensity.

[0063] In addition, the excitation spectrum of the phosphor 22 has a minimum value within the range of the half width of the emission peak of the first light-emitting element 11, for example. Figure 7 In the example shown, the excitation spectrum of the phosphor 22 has a minimum excitation intensity at a wavelength of about 380 nm. Figure 5 and Figure 7In the example shown, the wavelength of the emission peak of the first light-emitting element 11 coincides with the wavelength at which the excitation spectrum of the phosphor 22 shows a minimum. In addition, when the second light-emitting portion 20 includes other phosphors in addition to the phosphor 22, the excitation spectrum of the other phosphors may also have a minimum in the wavelength range in which the first light-emitting element 11 has emission intensity.

[0064] In addition, Figure 7 In the example shown, the excitation spectrum of the phosphor 22 has a peak of maximum excitation intensity at a wavelength of about 430 nm. In the excitation spectrum of the phosphor 22, the excitation intensity at the wavelength of the emission peak of the first light-emitting element 11 (about 380 nm in this example) can be, for example, less than half of the excitation intensity at the wavelength of the emission peak of the second light-emitting element 21 (about 450 nm in this example), or less than one-third. Accordingly, the luminous efficiency of the second light-emitting portion 20 can be improved, and the excitation of the phosphor 22 by the first light can be suppressed. Furthermore, in the excitation spectrum of the phosphor 22, the excitation intensity of the minimum value can be, for example, less than half of the excitation intensity of the maximum peak, or less than one-third.

[0065] Thus, in the light source module 50, the excitation spectrum of the phosphor 22 has a minimum value in the wavelength range in which the first light emitting element 11 has a light emission intensity. Therefore, even if a part of the first light emitted from the first light emitting unit 10 enters the second light emitting unit 20 due to diffusion or the like, the phosphor 22 is not easily excited by the incident first light. Thus, it is possible to suppress the phosphor 22 from emitting light of an undesirable wavelength due to the first light, and even in the case where the light source module 50 has the first light emitting unit 10, it is possible to suppress the color change of the white second light emitted by the second light emitting unit 20. In particular, the light emitted by the phosphor 22 becomes light of a longer wavelength than the excitation light, so the light emitted by the phosphor 22 excited by the first light becomes light of a wavelength longer than the wavelength of the first light and increases the visual sensitivity of the human being, thereby having a large influence on the color of the light perceived by the human being. For example, the visual sensitivity of the human being at 400nm is 10 times that of the human being at 380nm. Therefore, the excitation of the phosphor 22 by the first light in the second light emitting unit 20 is suppressed, so that the color of the light can be suppressed from changing from the white color that is appropriate as illumination. Furthermore, the first light is not easily absorbed by the fluorescent body 22, so the reduction in the light amount of the first light containing the purple component in the output light can be suppressed. As a result, the light source module 50 can efficiently emit the output light containing the purple component and used for lighting. As a result, the output light of the light source module 50 can be used for lighting with a myopia suppression effect, for example.

[0066] In addition, if Figure 8As shown, the spectrum of the output light is a spectrum obtained by adding the spectrum of the first light and the spectrum of the second light at a predetermined ratio. The predetermined ratio is adjusted, for example, by the number of the first light emitting unit 10 and the second light emitting unit 20 provided in the light source module 50, and the output of the first light emitting unit 10 and the second light emitting unit 20. Figure 8 The spectrum shown is, for example, the spectrum of the output light when the same current flows to the first light emitting unit 10 and the second light emitting unit 20 of the light source module 50. The output light has the highest luminous intensity at the wavelength of the luminous peak of the first light emitting element 11 (about 380 nm in this example). Since people have low visual sensitivity to light of purple wavelengths, even if the luminous intensity of the wavelength of the luminous peak of the first light emitting element 11 is high, the effect on the perceived light color of the output light is small, so it is possible to increase the purple component in the output light, thereby improving the effect of suppressing people's myopia.

[0067] [Effects, etc.]

[0068] As described above, the light source module 50 involved in the present embodiment is a light source module 50 that emits output light, and the light source module 50 includes: a first light emitting unit 10 that emits a first light; and a second light emitting unit 20 that emits a second white light. The first light emitting unit 10 includes a first light emitting element 11. The second light emitting unit 20 includes a second light emitting element 21 and a phosphor 22, and the phosphor 22 is a phosphor that emits light by being excited by light from the second light emitting element 21. The output light includes the first light and the second light. The wavelength of the emission peak of the first light emitting element 11 is greater than 350 nm and less than 410 nm, which is shorter than the wavelength of the emission peak of the second light emitting element 21. The excitation spectrum of the phosphor 22 has a minimum value in the wavelength range of greater than 350 nm and less than 410 nm and in the wavelength range in which the first light emitting element 11 has emission intensity.

[0069] Accordingly, even if a part of the first light containing the purple component emitted from the first light emitting unit 10 is incident on the second light emitting unit 20 due to diffusion or the like, the phosphor 22 is not easily excited by the incident first light. As a result, it is possible to suppress the phosphor 22 from emitting light of an undesirable wavelength due to the first light, and even in the case where the light source module 50 has the first light emitting unit 10, it is possible to suppress the color of the white second light emitted by the second light emitting unit 20 from changing. In other words, in the second light emitting unit 20, the excitation of the phosphor 22 caused by the first light is suppressed, so that the color of the light can be suppressed from changing from the white color that is appropriate for illumination. Furthermore, the first light is not easily absorbed by the phosphor 22, so that the reduction in the amount of the first light containing the purple component in the output light can be suppressed. Therefore, the light source module 50 can efficiently emit output light containing the purple component.

[0070] Furthermore, for example, the excitation spectrum of the phosphor 22 has a minimum value within the range of the half width of the emission peak of the first light-emitting element 11 .

[0071] According to this, in the second light emitting section 20 , the excitation of the fluorescent body 22 due to the first light can be further suppressed.

[0072] Furthermore, for example, in the excitation spectrum of the phosphor 22 , the intensity of the wavelength of the emission peak of the first light emitting element 11 is less than half the intensity of the wavelength of the emission peak of the second light emitting element 21 .

[0073] According to this, the light emission efficiency of the second light emitting section 20 can be improved, and the excitation of the phosphor 22 due to the first light can be suppressed.

[0074] Furthermore, for example, the output light of the light source module 50 has the highest light emission intensity at the wavelength of the light emission peak of the first light emitting element 11 .

[0075] This can increase the purple component in the output light, thereby increasing the effect of the output light on suppressing myopia of a person, for example.

[0076] Furthermore, the lighting fixture 100 according to the present embodiment includes the light source module 50 and the lighting circuit 70 that supplies power for lighting the light source module 50 to the light source module 50 .

[0077] This makes it possible to realize the lighting fixture 100 that efficiently emits output light including a violet component.

[0078] [Modifications]

[0079] Next, a modification of Embodiment 1 will be described. In the following description, differences from Embodiment 1 will be mainly described, and description of common points will be omitted or simplified.

[0080] Fig. 9 FIG. 5 is a plan view showing a light source module 50a according to this modification. Fig. 9 As shown, the light source module 50a is different from the light source module 50 according to Embodiment 1 in that the plurality of first light emitting units 10 and the plurality of second light emitting units 20 are not arranged at equal intervals. In the lighting fixture 100 , for example, the light source module 50 is replaced by the light source module 50a.

[0081] The plurality of first light-emitting sections 10 include a first light-emitting section 10a as one of the plurality of first light-emitting sections 10. Furthermore, the plurality of second light-emitting sections 20 include a second light-emitting section 20a that is closest to the first light-emitting section 10a among the plurality of second light-emitting sections 20, and a second light-emitting section 20b that is closest to the second light-emitting section 20a among the plurality of second light-emitting sections 20. The first light-emitting section 10a is an example of a first purple light-emitting section. The second light-emitting section 20a is an example of a first white light-emitting section. The second light-emitting section 20b is an example of a second white light-emitting section. The first light-emitting section 10a and the second light-emitting section 20a and the second light-emitting section 20b are arranged in a row, for example, in the order of the first light-emitting section 10a, the second light-emitting section 20a, and the second light-emitting section 20b.

[0082] The distance W1 between the first light-emitting section 10a and the second light-emitting section 20a is longer than the distance W2 between the second light-emitting section 20a and the second light-emitting section 20b. Therefore, the distance W1 between the second light-emitting section 20a and the first light-emitting section 10a closest to the second light-emitting section 20a becomes longer, so that the first light emitted by the first light-emitting section 10a is not easily incident on the second light-emitting section 20a. As a result, the excitation of the phosphor 22 caused by the first light can be further suppressed. Therefore, the change in the light color of the second light and the decrease in the light amount of the first light in the output light can be further suppressed.

[0083] In the light source module 50 a , each of the plurality of second light emitting units 20 has a longer distance to the first light emitting unit 10 closest to itself than to the second light emitting unit 20 closest to itself.

[0084] As described above, in the light source module 50a involved in this variation, at least one first light emitting unit 10 includes a first light emitting unit 10a, and at least one second light emitting unit 20 includes a second light emitting unit 20a and a second light emitting unit 20b, wherein the second light emitting unit 20a is the second light emitting unit closest to the first light emitting unit 10a among the second light emitting units 20, and the second light emitting unit 20b is the second light emitting unit closest to the second light emitting unit 20a among the second light emitting units 20. The distance W1 between the first light emitting unit 10a and the second light emitting unit 20a is longer than the distance W2 between the second light emitting unit 20a and the second light emitting unit 20b.

[0085] Accordingly, the first light emitted by the first light emitting portion 10 a is less likely to enter the second light emitting portion 20 a , and the excitation of the phosphor 22 by the first light can be further suppressed.

[0086] (Implementation Method 2)

[0087] Next, Embodiment 2 will be described. In the following description, the differences from Embodiment 1 and the modification of Embodiment 1 will be mainly described, and the description of the common points will be omitted or simplified.

[0088] Fig.10 2 is a block diagram showing the structure of the lighting fixture 200 according to the present embodiment. Fig.10 As shown, the lighting fixture 200 is different from the lighting fixture 100 according to the first embodiment in that it includes a light source module 250 instead of the light source module 50 .

[0089] Like the light source module 50, the light source module 250 has a plurality of light emitting units, including at least one first light emitting unit 10 and at least one second light emitting unit 20, but the spectrum of the output light is different from that of the light source module 50. Regarding the configuration of the light source module 250, for example, except that the light source module 250 is composed of a plurality of light emitting units in a manner of emitting output light having a spectrum different from that of the light source module 50, the other configurations are the same as those of the light source module 50. The output light emitted by the light source module 250 includes the first light emitted by all the first light emitting units 10 provided by the light source module 250 and the second light emitted by all the second light emitting units 20 provided by the light source module 250.

[0090] For example, the light source module 250 has a different number of first light-emitting units 10 and second light-emitting units 20 than the light source module 50, and therefore the spectrum of the output light is different from that of the light source module 50. Alternatively, the light source module 250 may have a different light-emitting characteristic of at least one of the first light-emitting element 11, the second light-emitting element 21, and the phosphor 22 than that of the light source module 50, and therefore the spectrum of the output light is different from that of the light source module 50.

[0091] Fig.11 : is a diagram showing an example of the spectrum of the output light emitted by the light source module 250 according to the present embodiment and the spectrum of sunlight having the same correlated color temperature as the output light. Fig.11 In the figure, the horizontal axis represents the wavelength (unit: nm). Fig.11 In FIG. 1 , the vertical axis represents the normalized luminous intensity with the maximum value being 1. In addition, the spectra of the first light and the second light and the excitation spectrum of the phosphor 22 are respectively, for example, Figures 5 to 7 Spectra shown.

[0092] Fig.11 The spectrum of the output light shown is a spectrum when the correlated color temperature of the output light is 5000K. Fig.11 The spectrum of sunlight shown is the spectrum of a standard light source of the D series with a correlated color temperature of 5000K defined by the International Commission on Illumination (CIE) (i.e., CIE standard light source D50). In this specification, the spectrum of sunlight can be regarded as the spectrum of light of a standard light source of each correlated color temperature defined by the International Commission on Illumination. In other words, in this specification, sunlight can be regarded as light of a standard light source of each correlated color temperature defined by the International Commission on Illumination.

[0093] In addition, if Fig.11 As shown, the spectrum of the output light is Figure 5 The spectrum of the first light shown is Figure 6 The spectrum of the second light shown is a spectrum obtained by adding the spectra of the second light at a predetermined ratio. The predetermined ratio is adjusted by, for example, the number of the first light emitting unit 10 and the second light emitting unit 20 provided in the light source module 250, and the output of the first light emitting unit 10 and the second light emitting unit 20. Fig.11 The output light spectrum shown is, for example, a spectrum of output light when the same current flows through the first light emitting section 10 and the second light emitting section 20 included in the light source module 250 .

[0094] In the light source module 250, the wavelength range of 360 nm to 400 nm in the output light (in Fig.11 The ratio of the radiant flux of the wavelength range between 360 nm and 400 nm in the output light to the total radiant flux in the visible light region is the same as the ratio of the radiant flux of the wavelength range between 360 nm and 400 nm in the sunlight having the same correlated color temperature as the output light to the total radiant flux in the visible light region. In addition, in the light source module 250, the ratio of the radiant flux of the wavelength range between 360 nm and 400 nm in the output light to the total luminous flux in the visible light region (in other words, the ratio of the radiant flux to the total luminous flux) is the same as the ratio of the radiant flux of the wavelength range between 360 nm and 400 nm in the sunlight having the same correlated color temperature as the output light to the total luminous flux in the visible light region. Thus, the output light contains the violet component at the same ratio as the sunlight, so even if it is lighting containing the violet component, the load on people can be reduced. Therefore, the light source module 250 can emit output light containing the violet component and suitable for lighting. Therefore, the light source module 250 can be used for lighting having a myopia suppression effect, for example. Furthermore, since the emitted output light contains a purple component which is lacking in ordinary light sources for illumination, it can be illumination that is more beneficial to humans.

[0095] In the present specification, the visible light region can be regarded as a wavelength range of, for example, 360 nm to 780 nm.

[0096] The output light and the radiant flux of sunlight are equivalent to Fig.11 Therefore, when the wavelength is λ and the spectrum of the output light is P L (λ), let the spectrum of sunlight be P S (λ), the total radiant flux of the output light in the visible light region is Φ Lall and the radiant flux Φ in the wavelength range above 360nm and below 400nm Lv , and the total radiation flux of sunlight in the visible light region ΦSall and the radiant flux Φ in the wavelength range above 360nm and below 400nm Sv , can be calculated by the following formula. L (λ) and P S (λ) is a function of wavelength (unit: nm).

[0097] [Mathematical formula 1]

[0098]

[0099] [Mathematical formula 2]

[0100]

[0101] [Mathematical formula 3]

[0102]

[0103] [Formula 4]

[0104]

[0105] In addition, when the visual sensitivity of human beings is K(λ), the total luminous flux Φ in the visible light region of the output light is VLall and the total luminous flux of sunlight in the visible light region Φ VSall , can be calculated by the following formula. K(λ) is a function of wavelength (unit: nm).

[0106] [Mathematical formula 5]

[0107]

[0108] [Mathematical formula 6]

[0109]

[0110] Therefore, in the light source module 250, when using P L (λ) and P with the same correlated color temperature as the output light S (λ) When the ratio of the above-mentioned radiation flux to the above-mentioned total radiation flux is calculated by the above-mentioned formula, the radiation flux Φ Lv / Total radiation flux Φ Lall and the radiation flux Φ Sv / Total radiation flux Φ Sall In addition, in the light source module 250, when using P L (λ) and P with the same correlated color temperature as the output light S (λ) When the ratio of the radiant flux to the total luminous flux is calculated by the above formula, the radiant flux Φ Lv / Total luminous flux ΦVLall and the radiation flux Φ Sv / Total luminous flux Φ VSall are the same. In addition, in this specification, the same means substantially the same. Here, substantially the same means, for example, that no matter which value is used as a reference, a difference of less than ±30% is included. In addition, substantially the same may also mean that no matter which value is used as a reference, a difference of less than ±20% is included, or a difference of less than ±10% is included regardless of which value is used as a reference.

[0111] In addition, if Fig.11 As shown, the output light has the highest luminous intensity at the wavelength of the luminous peak of the second light emitting element 21 (about 450nm in this example). And the number of peaks (maxima) in the spectrum of the output light is Fig.11 In the example shown, the number is 3. The number of peaks in the spectrum of the output light is not limited to 3, and may be, for example, 7 or less, or 5 or less. Thus, the light source module 250 can be realized with a simple structure. Furthermore, the number of peaks in the spectrum of the output light is, for example, 3 or more.

[0112] In addition, the light source module 250 is not limited to the above-mentioned example as long as the light spectral characteristics of the output light and the light spectral characteristics of sunlight are configured in such a manner that the light source module 250 is configured in such a manner that the light spectral characteristics of the output light and the sunlight are in the above-mentioned relationship. For example, the light source module 250 may be configured to include a plurality of light emitting units having a plurality of LED chips that emit light of different colors instead of the second light emitting unit 20.

[0113] [Effects, etc.]

[0114] As described above, the light source module 250 involved in this embodiment is a light source module 250 that emits output light, and the light source module 250 includes a plurality of light-emitting units. The plurality of light-emitting units include light-emitting units that emit light of different light colors from each other. The output light includes light emitted by each of the plurality of light-emitting units. In the output light of the light source module 250, the ratio of the radiant flux in the wavelength range of 360 nm or more and 400 nm or less to the total radiant flux in the visible light region is the same as the above ratio in sunlight having the same correlated color temperature as the output light of the light source module 250.

[0115] According to this, the ratio of the output light including the purple component is the same as that of sunlight, so even if the output light including the purple component is used for lighting, the load on humans can be reduced. Therefore, the light source module 250 can emit output light including the purple component and suitable for lighting. In addition, the above ratio can be calculated using the radiant flux, so a value directly related to the energy radiated to humans can be used.

[0116] In addition, the light source module 250 involved in this embodiment is a light source module 250 that emits output light, and the light source module 250 has a plurality of light-emitting parts. The plurality of light-emitting parts include light-emitting parts that emit light of different light colors from each other. The output light includes light emitted by each of the plurality of light-emitting parts. In the output light of the light source module 250, the ratio of the radiant flux in the wavelength range of 360 nm or more and 400 nm or less to the total luminous flux in the visible light region is the same as the above ratio in sunlight having the same correlated color temperature as the output light of the light source module 250.

[0117] According to this, the ratio of the output light including the purple component is the same as that of sunlight, so even if the output light including the purple component is used for lighting, the load on people can be reduced. Therefore, the light source module 250 can emit output light including the purple component and suitable for lighting. In addition, since the ratio of the radiant flux to the total luminous flux is used, it is easy to apply to lighting design.

[0118] In addition, for example, the plurality of light-emitting units include: a first light-emitting unit 10 that emits a first light and a second light-emitting unit 20 that emits a second white light. The first light-emitting unit 10 includes a first light-emitting element 11. The second light-emitting unit 20 includes a second light-emitting element 21 and a phosphor 22, and the phosphor 22 is a phosphor that emits light by being excited by light from the second light-emitting element 21. The output light includes the first light and the second light. The wavelength of the emission peak of the first light-emitting element 11 is greater than 360 nm and less than 400 nm, which is shorter than the wavelength of the emission peak of the second light-emitting element 21. The excitation spectrum of the phosphor 22 has a minimum value in the wavelength range of greater than 360 nm and less than 400 nm and in the wavelength range in which the first light-emitting element 11 has emission intensity.

[0119] According to this, even if a part of the first light containing the purple component emitted from the first light emitting unit 10 is incident on the second light emitting unit 20 due to diffusion or the like, the phosphor 22 is not easily excited by the incident first light. Thus, it is possible to suppress the phosphor 22 from emitting light of an undesirable wavelength due to the first light, and even if the light source module 250 has the first light emitting unit 10, it is possible to suppress the color change of the white second light emitted by the second light emitting unit 20. Furthermore, since the first light is not easily absorbed by the phosphor 22, it is possible to suppress the reduction in the light amount of the first light containing the purple component in the output light.

[0120] Furthermore, for example, the excitation spectrum of the phosphor 22 has a minimum value within the range of the half width of the emission peak of the first light-emitting element 11 .

[0121] According to this, in the second light emitting section 20 , the excitation of the fluorescent body 22 due to the first light can be further suppressed.

[0122] Furthermore, the lighting fixture 200 according to the present embodiment includes a light source module 250 and a lighting circuit 70 that supplies power for lighting the light source module 250 to the light source module 250 .

[0123] According to this, it is possible to realize the lighting fixture 200 that can emit output light that includes a violet component and is suitable for lighting.

[0124] [Modifications]

[0125] Next, a modification of Embodiment 2 will be described. In the following description, differences from Embodiment 1, the modification of Embodiment 1, and Embodiment 2 will be mainly described, and description of common points will be omitted or simplified.

[0126] Fig.12 2 is a block diagram showing the structure of a lighting fixture 200a according to this modification. Fig.12 As shown, the lighting fixture 200 a is different from the lighting fixture 200 according to the second embodiment in that a light source module 250 a is provided instead of the light source module 250 , and a control unit 90 is additionally provided.

[0127] The light source module 250a includes a first light emitting unit 10, a second light emitting unit 20, and a third light emitting unit 30. In other words, the light source module 250a includes the third light emitting unit 30 in addition to the configuration of the light source module 250.

[0128] The third light emitting unit 30 emits a third light of white color. The output light emitted by the light source module 250a includes the first light emitted by all the first light emitting units 10 of the light source module 250a, the second light emitted by all the second light emitting units 20 of the light source module 250a, and the third light emitted by all the third light emitting units 30 of the light source module 250a. In addition, there may be a case where, based on the control of the control unit 90, one of the second light emitting unit 20 and the third light emitting unit 30 does not emit light, and the output light does not include one of the second light and the third light.

[0129] The third light emitting unit 30 has the same configuration as the second light emitting unit 20 except that the correlated color temperature of the light emitted by the third light emitting unit 30 is different from that of the second light emitting unit 20. Figure 4The second light-emitting section 20 shown in the figure also has a light-emitting element, a phosphor, a sealing component, and a package. The light-emitting element, phosphor, sealing component, and package of the third light-emitting section 30 may have the configuration exemplified by the second light-emitting element 21, phosphor 22, sealing component 25, and package 27 of the second light-emitting section 20. For example, the excitation spectrum of the phosphor of the third light-emitting section 30 may have a minimum value in the wavelength range of 360 nm to 400 nm and in the wavelength range in which the first light-emitting element 11 has a luminous intensity. In the third light-emitting section 30, at least one of the output characteristics of the light-emitting element, the type and the number of the phosphors is different from the configuration of the corresponding second light-emitting element, so that the correlated color temperature of the emitted light is different from that of the second light-emitting section 20.

[0130] In the light source module 250a, the lighting of the first light emitting unit 10, the second light emitting unit 20 and the third light emitting unit 30 is controlled separately. In the light source module 250a, for example, the first light emitting unit 10, the second light emitting unit 20 and the third light emitting unit 30 are mounted on a substrate so as to be independently powered.

[0131] The control unit 90 controls the light emission of the light source module 250a. For example, the control unit 90 adjusts the output of each of the first light emitting unit 10, the second light emitting unit 20, and the third light emitting unit 30. For example, the control unit 90 uses the lighting circuit 70 to independently power the first light emitting unit 10, the second light emitting unit 20, and the third light emitting unit 30, and individually changes the current amount, thereby adjusting the light amount of each of the first light, the second light, and the third light. Thus, the control unit 90 changes the correlated color temperature of the output light. In addition, in the power supply based on the control unit 90 and using the lighting circuit 70, there may be a light emitting unit that is not powered according to the correlated color temperature of the target output light. In addition, the control of the output of the first light emitting unit 10, the second light emitting unit 20, and the third light emitting unit 30 performed by the control unit 90 may also be PWM (Pulse Width Modulation) control.

[0132] In addition, the control unit 90 can be implemented by an integrated circuit (IC), i.e., LSI (LargeScale Integration). In addition, integrated circuits are not limited to LSIs, and can also be implemented by dedicated circuits or general-purpose processors. For example, the control unit 90 can also be a microcontroller. The microcontroller includes, for example, a non-volatile memory storing a program, a temporary storage area for executing the program, i.e., a volatile memory, an input / output port, a processor for executing the program, and the like. Furthermore, the control unit 90 can adopt a programmable FPGA (Field Programmable Gate Array), or a reconfigurable processor that can reconfigure the connection and settings of the circuit units inside the LSI. The functions performed by the control unit 90 can be implemented by software or by hardware.

[0133] Fig.13 : is an xy chromaticity diagram of the CIE1931 color space for explaining an example of changes in the correlated color temperature of output light in the lighting fixture 200a according to this modification. Fig.13 Schematic diagram showing a situation in which the second light emitting unit 20 emits a second light having a chromaticity coordinate L2 and the third light emitting unit 30 emits a third light having a chromaticity coordinate L3.

[0134] exist Fig.13 In the example shown, the correlated color temperature of the second light is 6500K, and the correlated color temperature of the third light is 3000K. In addition, the correlated color temperatures of the second light and the third light are not particularly limited, and can be set according to the range in which the correlated color temperature of the output light is to be adjusted. Fig.13 In the example shown, the chromaticity coordinates L2 of the second light and L3 of the third light are chromaticity coordinates on the black body radiation locus, but they may deviate from the black body radiation locus. In addition, at least one of the chromaticity coordinates L2 of the second light and L3 of the third light may be a chromaticity coordinate outside the specified range of the correlated color temperature.

[0135] The output light includes the first light in addition to the second light and the third light, but the first light has little effect on the correlated color temperature of the output light. Therefore, the correlated color temperature of the output light is roughly determined by the ratio of the light amounts of the second light and the third light. In order to simplify the description below, the output light correlated color temperature is determined by the ratio of the light amounts of the second light and the third light.

[0136] The control unit 90 changes the chromaticity coordinates of the light obtained by mixing the second light and the third light between the chromaticity coordinates L2 and the chromaticity coordinates L3 by controlling the ratio between the output of the second light emitting unit 20 and the output of the third light emitting unit 30. With this change, the correlated color temperature of the output light also changes between the correlated color temperature of the second light and the correlated color temperature of the third light.

[0137] Furthermore, the control unit 90 changes the correlated color temperature of the output light so that the ratio of the radiant flux in the wavelength range of 360 nm to 400 nm in the output light to the total radiant flux in the visible light region is the same as the ratio of the radiant flux in the wavelength range of 360 nm to 400 nm in sunlight having the same correlated color temperature as the output light to the total radiant flux in the visible light region. Furthermore, the control unit 90 changes the correlated color temperature of the output light so that the ratio of the radiant flux in the wavelength range of 360 nm to 400 nm in the output light to the total luminous flux in the visible light region is the same as the ratio of the radiant flux in the wavelength range of 360 nm to 400 nm in sunlight having the same correlated color temperature as the output light to the total luminous flux in the visible light region. At this time, the control unit 90 controls the output of the first light emitting unit 10 to increase when the correlated color temperature of the output light is high, and controls the output of the first light emitting unit 10 to decrease when the correlated color temperature of the output light is low. The control unit 90, for example, maintains a data table that establishes a correspondence between the correlated color temperature of the output light and the power supply (current) for each of the first light-emitting unit 10, the second light-emitting unit 20, and the third light-emitting unit 30, and based on the data table, controls the power supply from the lighting circuit 70 to the light source module 250a so as to obtain the desired correlated color temperature of the output light. The data table can be designed based on the output characteristics of the first light-emitting unit 10, the second light-emitting unit 20, and the third light-emitting unit 30, and the spectra of the first light, the second light, and the third light.

[0138] As described above, the lighting fixture 200a according to the present modification includes the control unit 90, and the control unit 90 changes the correlated color temperature of the output light by adjusting the output of each of the plurality of light emitting units of the light source module 250a. For example, the control unit 90 changes the correlated color temperature of the output light of the light source module 250a in such a manner that the ratio of the radiant flux in the wavelength range of 360 nm to 400 nm to the total radiant flux in the visible light region in the output light of the light source module 250a is the same as the above ratio in the sunlight having the same correlated color temperature as the output light of the light source module 250a. Furthermore, for example, the control unit 90 changes the correlated color temperature of the output light of the light source module 250a in such a manner that the ratio of the radiant flux in the wavelength range of 360 nm to 400 nm to the total luminous flux in the visible light region in the output light of the light source module 250a is the same as the above ratio in the sunlight having the same correlated color temperature as the output light of the light source module 250a.

[0139] Therefore, even when the correlated color temperature of the output light changes, the ratio of the purple component of the output light matches the sunlight of each correlated color temperature, so that the load on humans can be reduced.

[0140] (other)

[0141] As mentioned above, the light source module and the lighting fixture according to the present invention have been described based on the above-mentioned embodiments and modified examples. However, the present invention is not limited to the above-mentioned embodiments and modified examples.

[0142] For example, at least one of the first light emitting element 11 and the second light emitting element 21 may not be an LED chip. For example, at least one of the first light emitting element 11 and the second light emitting element 21 may be an element other than an LED chip, such as a laser element or an organic electroluminescence element.

[0143] In addition, for example, the second light emitting unit 20 may include a sintered body of the phosphor 22 instead of the sealing member 25 in which the phosphor 22 is dispersed. Furthermore, the second light emitting unit 20 may be a remote phosphor type light emitting module.

[0144] In addition, the present invention also includes forms obtained by implementing various modifications conceived by technicians in this field for each embodiment and each variant, as well as forms achieved by arbitrarily combining the constituent elements and functions in each embodiment and each variant within the scope not exceeding the main purpose of the present invention.

[0145] Examples of the light source module and lighting fixture according to the present invention described based on the above-mentioned embodiment and modified examples are shown below. The light source module and lighting fixture according to the present invention are not limited to the following examples.

[0146] The light source module involved in the first embodiment of the present invention is a light source module that emits output light, and the light source module comprises: at least one purple light-emitting portion, the purple light-emitting portion has a first light-emitting element for emitting a first light; and at least one white light-emitting portion, the white light-emitting portion has a second light-emitting element and a phosphor, the white light-emitting portion is used to emit a white second light, the phosphor is a phosphor that emits light through excitation by light from the second light-emitting element, the output light includes the first light and the second light, the wavelength of the emission peak of the first light-emitting element is greater than 350nm and less than 410nm, which is shorter than the wavelength of the emission peak of the second light-emitting element, and the excitation spectrum of the phosphor has a minimum value in the wavelength range of greater than 350nm and less than 410nm and the wavelength range in which the first light-emitting element has a emission intensity.

[0147] A light source module according to a second aspect of the present invention is the light source module according to the first aspect, wherein the excitation spectrum has a minimum value within a range of a half width of a light emission peak of the first light emitting element.

[0148] The light source module involved in the third aspect of the present invention is the light source module involved in the first aspect or the second aspect, wherein in the excitation spectrum, the intensity of the wavelength of the emission peak of the first light-emitting element is less than half the intensity of the wavelength of the emission peak of the second light-emitting element.

[0149] The light source module involved in the fourth embodiment of the present invention is a light source module involved in any one of the first embodiment to the third embodiment, wherein the at least one purple light-emitting portion includes a first purple light-emitting portion, and the at least one white light-emitting portion includes a first white light-emitting portion and a second white light-emitting portion, the first white light-emitting portion is the white light-emitting portion closest to the first purple light-emitting portion among the at least one white light-emitting portion, and the second white light-emitting portion is the white light-emitting portion closest to the first white light-emitting portion among the at least one white light-emitting portion, and the distance between the first purple light-emitting portion and the first white light-emitting portion is longer than the distance between the first white light-emitting portion and the second white light-emitting portion.

[0150] A light source module according to a fifth aspect of the present invention is the light source module according to any one of the first to fourth aspects, wherein the output light has the highest light emission intensity at a wavelength of a light emission peak of the first light emitting element.

[0151] A lighting fixture according to a sixth aspect of the present invention includes the light source module according to any one of the first to fifth aspects; and a lighting circuit that supplies power for lighting the light source module to the light source module.

[0152] Description of Reference Numerals

[0153] 10, 10a first light emitting part (purple light emitting part)

[0154] 11 first light emitting element

[0155] 20, 20a, 20b second light emitting unit (white light emitting unit)

[0156] 21. Second light emitting element

[0157] 22 Phosphor

[0158] 50, 50a, 250, 250a light source module

[0159] 70 lighting circuit

[0160] 100, 200, 200a lighting fixtures

Claims

1. A light source module that emits output light, The light source module comprises: at least one purple light emitting section having a first light emitting element for emitting a first light; and at least one white light emitting unit, the white light emitting unit having a second light emitting element and a phosphor, the white light emitting unit being configured to emit a second white light, the phosphor being a phosphor that emits light when excited by light from the second light emitting element, The output light includes the first light and the second light, The wavelength of the emission peak of the first light emitting element is greater than 350 nm and less than 410 nm, which is shorter than the wavelength of the emission peak of the second light emitting element. The excitation spectrum of the phosphor has a minimum value in a wavelength range of 350 nm to 410 nm, and in a wavelength range in which the first light-emitting element has light emission intensity.

2. The light source module according to claim 1, The excitation spectrum has a minimum value within a range of a half width of a light emission peak of the first light emitting element.

3. The light source module according to claim 1, In the excitation spectrum, the intensity of the wavelength of the emission peak of the first light-emitting element is less than half the intensity of the wavelength of the emission peak of the second light-emitting element.

4. The light source module according to claim 1, The at least one purple light emitting portion includes a first purple light emitting portion, The at least one white light emitting portion includes a first white light emitting portion and a second white light emitting portion, wherein the first white light emitting portion is the white light emitting portion closest to the first purple light emitting portion among the at least one white light emitting portion, and the second white light emitting portion is the white light emitting portion closest to the first white light emitting portion among the at least one white light emitting portion. The distance between the first purple light-emitting portion and the first white light-emitting portion is longer than the distance between the first white light-emitting portion and the second white light-emitting portion.

5. The light source module according to claim 1, The output light has the highest luminous intensity at the wavelength of the luminous peak of the first light-emitting element.

6. A lighting device having: The light source module according to any one of claims 1 to 5; and The lighting circuit supplies power for lighting the light source module to the light source module.

Images