WO2024024623A1 - Light source module and lighting device - Google Patents

Abstract

This light source module is for emitting output light and comprises a plurality of light emission units. The plurality of light emission units include a plurality of light emission units that emit light having light colors different from each other. The output light includes light emitted from each of the light emission units. Regarding the output light of the light source module, the ratio of radiant fluxes within the wavelength range of 360-400 nm to all radiant fluxes in the visible light region is the same between the output light of the light source module and sunlight having the same correlated color temperature as the output light.

Description

Light source module and lighting equipment

The present invention relates to a light source module and a lighting fixture.

Patent Document 1 discloses a light source module including a blue-violet LED (Light Emitting Diode) and a white LED.

Special table 2019-525413 publication

In recent years, findings have been reported that purple light is effective in suppressing myopia in people. In the prior art, there is no disclosure regarding the configuration of a light source module suitable for using light containing a violet component as illumination for a person.

An object of the present invention is to provide a light source module and a lighting fixture that can emit output light that includes a violet component and is suitable for use in illumination.

A light source module according to one aspect of the present invention is a light source module that emits output light, and includes a plurality of light emitting sections, the plurality of light emitting sections including light emitting sections that emit light of different light colors, and the light source module that emits output light. The light includes light emitted by each of the plurality of light emitting parts, and in the output light, 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 has the same correlated color as the output light. The temperature is the same as sunlight.

A light source module according to one aspect of the present invention is a light source module that emits output light, and includes a plurality of light emitting sections, the plurality of light emitting sections including light emitting sections that emit light of different light colors, and the light source module that emits output light. The light includes light emitted by each of the plurality of light emitting parts, and in the output light, the radiant flux in the wavelength range of 360 nm to 400 nm per unit total luminous flux in the visible light region has the same correlated color temperature as the output light. is the same as sunlight.

A lighting fixture according to one aspect of the present invention includes the light source module and a lighting circuit that supplies power to the light source module to light the light source module.

According to the present invention, it is possible to provide a light source module and a lighting fixture that can emit output light that includes a violet component and is suitable for use in illumination.

FIG. 1 is a perspective view showing an example of the appearance of a lighting fixture including a light source module according to a first embodiment. FIG. 2 is a block diagram showing the configuration of the lighting fixture according to the first embodiment. FIG. 3 is a plan view showing the light source module according to the first embodiment. FIG. 4 is a sectional view showing a part of the light source module according to the first embodiment. FIG. 5 is a diagram showing an example of the spectrum of the first light emitted by the first light emitting section according to the first embodiment. FIG. 6 is a diagram showing an example of the spectrum of the second light emitted by the second light emitting section according to the first embodiment. FIG. 7 is a diagram showing an example of the excitation spectrum of the phosphor included in the second light emitting section according to the first embodiment. FIG. 8 is a diagram showing an example of the spectrum of output light emitted by the light source module according to the first embodiment. FIG. 9 is a plan view showing a light source module according to a modification of the first embodiment. FIG. 10 is a block diagram showing the configuration of a lighting fixture according to the second embodiment. FIG. 11 is a diagram showing an example of the spectrum of output light emitted by the light source module according to the second embodiment and the spectrum of sunlight having the same correlated color temperature as the output light. FIG. 12 is a block diagram showing the configuration of a lighting fixture according to a modification of the second embodiment. FIG. 13 is an xy chromaticity diagram of the CIE1931 color space for explaining an example of a change in the correlated color temperature of output light in a lighting fixture according to a modification of the second embodiment.

Hereinafter, a light source module and a lighting fixture according to an embodiment of the present invention will be described in detail using the drawings. Note that all of the embodiments described below are specific examples of the present invention. Therefore, the numerical values, shapes, materials, components, arrangement and connection forms of the components, steps, order of steps, etc. shown in the following embodiments are merely examples, and are not intended to limit the present invention. Among the constituent elements in the following embodiments, constituent elements not stated in the independent claims will be described as arbitrary constituent elements.

Furthermore, each figure is a schematic diagram and is not necessarily strictly illustrated. Therefore, for example, the scales and the like in each figure do not necessarily match. Further, in each figure, substantially the same configurations are denoted by the same reference numerals, and overlapping explanations will be omitted or simplified.

In addition, in this specification, terms that indicate relationships between elements, terms that indicate the shape of elements, and numerical ranges are not expressions that express only strict meanings, but are used to indicate substantially equivalent ranges, such as numerical values. This expression means that it also includes a difference of about %.

In addition, in this specification, ordinal numbers such as "first" and "second" do not mean the number or order of components, unless otherwise specified, and should be used to avoid confusion between similar components and to distinguish between them. It is used for the purpose of

Furthermore, in this specification, the numerical value of the color deviation Duv is the numerical value of Duv, which is a representation of the color deviation from the black body radiation locus defined by JIS Z8725, that is, the numerical value of duv is 1000 times. In other words, in this specification, the numerical value of the color deviation Duv is 1000 times the numerical value of duv, unless otherwise specified, according to JIS Z8725.

(Embodiment 1)
[composition]
First, the configurations of a light source module and a lighting fixture according to Embodiment 1 will be described using FIGS. 1 to 4.

FIG. 1 is a perspective view showing an example of the appearance of a lighting fixture 100 including a light source module 50 according to the present embodiment. FIG. 2 is a block diagram showing the configuration of lighting fixture 100 according to this embodiment. FIG. 3 is a plan view showing the light source module 50 according to this embodiment. FIG. 4 is a cross-sectional view showing a part of the light source module 50 according to this embodiment. FIG. 4 shows a cross section taken along the line IV--IV in FIG.

The lighting fixture 100 shown in FIG. 1 is, for example, a stand light. As shown in FIG. 2, the lighting fixture 100 includes a light source module 50 and a lighting circuit 70. The lighting fixture 100 further includes, for example, a head housing that houses the light source module 50, an arm that supports the head, and a main body to which the arm is attached. The lighting fixture 100 receives power supplied from a power supply device such as a commercial power supply, and uses the power to emit output light emitted by the light source module 50 as illumination light. Note that the lighting fixture 100 is not particularly limited as long as it is a lighting fixture used for lighting, and may be a ceiling light, a base light, a spotlight, a downlight, a pendant light, a wall light, a floor light, or the like. Furthermore, the lighting fixture 100 is, for example, a residential lighting fixture installed in a child's room, a bedroom, a living room, a study, etc., but may also be a lighting fixture used in an office, store, commercial facility, factory, etc. .

The light source module 50 emits output light used as illumination. The light color of the output light is, for example, white. As shown in FIG. 3, the light source module 50 includes a substrate 1, a first light emitting section 10, and a second light emitting section 20. In this embodiment, the light source module 50 includes a plurality of first light emitting sections 10 and a plurality of second light emitting sections 20. The first light emitting section 10 is an example of a violet light emitting section, and the second light emitting section 20 is an example of a white light emitting section. Note that in FIG. 3, a dot pattern is attached to the first light emitting section 10, but this is for distinguishing between the first light emitting section 10 and the second light emitting section 20. This does not mean that a dot pattern is attached to the .

The first light emitting section 10 and the second light emitting section 20 are each a surface mount device (SMD) light emitting module.

The first light emitting unit 10 emits first light. The second light emitting section 20 emits second light. The output light emitted by the light source module 50 includes first light emitted by all the first light emitting sections 10 included in the light source module 50 and second light emitted by all the second light emitting sections 20 included in the light source module 50. That is, 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 total radiant energy of the second light emitted by all the second light emitting sections 20 is, for example, greater than the total radiant energy of the first light emitted by all the first light emitting sections 10.

For example, the plurality of first light emitting sections 10 and the plurality of second light emitting sections 20 are arranged on the substrate 1 so as to be spaced apart from each other. In the example shown in FIG. 3, the plurality of first light emitting sections 10 and the plurality of second light emitting sections 20 are regularly arranged in a line at equal intervals. For example, the number of second light emitting sections 20 is greater than the number of first light emitting sections 10. Note that the number and arrangement of the first light emitting section 10 and the second light emitting section 20 are not particularly limited. The first light emitting section 10 and the second light emitting section 20 may be arranged in two or more rows, arranged in a ring shape, or arranged at grid points of a predetermined grid shape, for example. good. Further, the number of at least one of the first light emitting section 10 and the second light emitting section 20 may be one. The arrangement of the first light emitting section 10 and the second light emitting section 20 is determined, for example, by creating several arrangement patterns, evaluating the light radiation characteristics, etc. of each arrangement pattern, and selecting the best arrangement pattern. be done.

The plurality of first light emitting sections 10 and the plurality of second light emitting sections 20 are mounted on the substrate 1 so that, for example, the same amount of current flows through them. Note that the plurality of first light emitting sections 10 and the plurality of second light emitting sections 20 may be mounted on the substrate 1 so that individual currents can flow therein independently.

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

The first light emitting unit 10 includes a first light emitting element 11, a sealing member 15, and a package 17, as shown in FIG. The first light emitting section 10 does not include, for example, a phosphor, and directly emits the light emitted by the first light emitting element 11 as the first light. The first light is light containing a violet component having an intensity in the wavelength range of the violet component, and is, for example, violet light. By using the first light as light containing a violet component, for example, the output light can be used for illumination to obtain the effect of suppressing myopia in humans. Note that in this specification, the wavelength range of the violet component can be considered to be, for example, a wavelength range of 350 nm or more and 410 nm or less.

The first light emitting element 11 is, for example, an LED chip, and is placed in the recess of the package 17. The wavelength of the emission peak of the first light emitting element 11 is, for example, 350 nm or more and 410 nm or less, and may be 360 nm or more and 400 nm or less. Further, the wavelength of the light emission peak of the first light emitting element 11 is shorter than the wavelength of the light emission peak of the second light emitting element 21.

The sealing member 15 is a translucent resin material that seals the first light emitting element 11. The translucent resin material is not particularly limited as long as it is a material that transmits the light emitted by the first light emitting element 11. As the transparent resin material, for example, silicone resin, epoxy resin, urea resin, or the like is used.

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

As shown in FIG. 4, the second light emitting section 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 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. The mixed light is emitted as white second light. In this specification, white light refers to the range of daylight color (symbol D), daylight white (symbol N), white (symbol W), warm white (symbol WW), and light bulb color (symbol L), or, It means a light color for illumination along the black body radiation locus or synthetic daylight locus with a correlated color temperature above or below, and is intended to be the narrow range of white (symbol W) in the chromaticity classification of light colors. It's not something you do. The color deviation Duv of the second light and the output light is, for example, −10 or more and +10 or less.

The second light emitting element 21 is, for example, an LED chip, and is placed in the recess of the package 27. The wavelength of the emission peak of the second light emitting element 21 is, for example, 410 nm or more and 500 nm or less, and may be 420 nm or more and 470 nm or less. The second light emitting element 21 emits, for example, blue light.

The phosphor 22 is excited by a portion of the light emitted by the second light emitting element 21, and emits light with a longer wavelength than the light emitted by the second light emitting element 21. The phosphor 22 emits, for example, green light with an emission peak wavelength of 500 nm or more and 570 nm or less. The phosphor 22 is dispersed in the sealing member 25. The phosphor 22 is, for example, a yttrium aluminum garnet (YAG) phosphor or a lutetium aluminum garnet (LuAG) phosphor. By using these phosphors, it is possible to easily adjust the wavelength that exhibits a minimum value in the excitation spectrum of the phosphor 22, which will be described later. For example, by adjusting the compositional elements of the phosphor 22, the bandgap of the phosphor 22 changes, so the excitation spectrum of the phosphor 22 can be adjusted. Note that the color of the light emitted by the phosphor 22 is not limited to green, and may be a color other than green, such as yellow or red. Further, the second light emitting section 20 may further include another phosphor having a different emission peak wavelength from the phosphor 22 in order to adjust the color of the second light.

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 is a material that transmits the light emitted by the second light emitting element 21 and the phosphor 22. As the transparent resin material, for example, silicone resin, epoxy resin, urea resin, or the like is used.

The package 27 is, for example, a container molded into a predetermined shape using a resin material. Further, the package 27 is provided with wiring (not shown) connected to the second light emitting element 21.

The second light emitted by the second light emitting unit 20 is adjusted to a desired light color 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.

Note that the first light emitting unit 10 and the second light emitting unit 20 may not include the package 17 and the package 27, respectively, and the first light emitting element 11 and the second light emitting element 21 may be directly mounted on the substrate 1. That is, 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.

The lighting circuit 70 is a circuit that lights up the light source module 50 by supplying power to the light source module 50. The lighting circuit 70 supplies predetermined power (DC current) to each of the first light emitting section 10 and the second light emitting section 20, for example. The lighting circuit 70 includes, for example, a circuit that converts alternating current supplied from a commercial power source into direct current.

Note that 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 controls, for example, the power that the lighting circuit 70 supplies to the light source module 50. Furthermore, the lighting fixture 100 may further include an operation reception unit such as a switch or an input panel that receives an operation of the lighting fixture 100, a communication module for remote operation, and the like.

[Spectra of first light, second light and output light, and excitation spectrum of phosphor]
Next, the spectra of each of the first light, second light, and output light as well as the excitation spectrum of the phosphor 22 will be explained using FIGS. 5 to 8.

FIG. 5 is a diagram showing an example of the spectrum of the first light emitted by the first light emitting section 10 according to the present embodiment. FIG. 6 is a diagram showing an example of the spectrum of the second light emitted by the second light emitting section 20 according to the present embodiment. FIG. 7 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. FIG. 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. In FIGS. 5 to 8, the horizontal axis represents wavelength (unit: nm). In FIGS. 5, 6, and 8, the vertical axis represents the normalized luminescence intensity with the maximum value being 1. That is, FIGS. 5, 6, and 8 show spectra in which the radiant flux (unit: W/nm) is normalized for each wavelength. Moreover, in FIG. 7, the vertical axis represents the normalized excitation intensity with the maximum value being 1. Further, the excitation spectrum of a phosphor is generally almost the same as the absorption spectrum.

As shown in FIG. 5, the spectrum of the first light includes the emission 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, and the spectrum shown in FIG. 5 is the spectrum of the light emitted by the first light emitting element 11. It can be said that there is. In the example shown in FIG. 5, 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 violet component, for example.

Note that the first light may have an emission intensity or an emission peak outside the wavelength range of the violet component (for example, on a longer wavelength side than the violet component) because the first light emitting section 10 contains a phosphor. . When the first light has an emission intensity or an emission peak outside the wavelength range of the violet component, the maximum value of the emission intensity or the emission intensity at the emission peak is, for example, the emission peak of the light emitted by the first light emitting element 11. less than half the strength. Further, if the first light has an emission intensity or an emission peak outside the wavelength range of the violet component, for example, the radiant flux in the wavelength range of the violet component in the first light is the radiation outside the wavelength range of the violet component in the first light. The number may be one or more times the number of bundles, or may be two or more times the number of bundles.

As shown in FIG. 6, the spectrum of the second light includes an emission peak of the light emitted by the second light emitting element 21 and a broad emission peak of the light emitted by the phosphor 22. FIG. 6 shows the spectrum of the second light when the correlated color temperature is 5000K. In the example shown in FIG. 6, 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. Furthermore, the wavelength of the light emitted by the phosphor 22 is approximately 580 nm.

As shown in FIG. 7, the excitation spectrum of the phosphor 22 has a minimum value in the wavelength range from 350 nm to 410 nm in which the first light emitting element 11 has an emission intensity. For example, when the phosphor 22 that emits green light is used, the excitation intensity of the phosphor 22 tends to be small in the wavelength range in which the first light emitting element 11 has an emission intensity of 350 nm or more and 410 nm or less. Further, the excitation spectrum of the phosphor 22 may have a minimum value in a wavelength range from 360 nm to 400 nm in which the first light emitting element 11 has an emission intensity.

Furthermore, the excitation spectrum of the phosphor 22 has a minimum value within the half width of the emission peak of the first light emitting element 11, for example. In the example shown in FIG. 7, the excitation spectrum of the phosphor 22 has a minimum value of excitation intensity at about 380 nm. Therefore, in the examples shown in FIGS. 5 and 7, the wavelength of the emission peak of the first light emitting element 11 and the wavelength at which the excitation spectrum of the phosphor 22 shows the minimum value match. Note that when the second light emitting section 20 includes another phosphor other than the phosphor 22, the excitation spectrum of the other phosphor also has a minimum value in the wavelength range in which the first light emitting element 11 has an emission intensity. Good too.

In the example shown in FIG. 7, the excitation spectrum of the phosphor 22 has a maximum excitation intensity peak 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 (approximately 380 nm in this example) is, for example, the excitation intensity at the wavelength of the emission peak of the second light emitting element 21 (approximately 450 nm in this example). It is half or less of the excitation intensity, and may be one-third or less. Thereby, excitation of the phosphor 22 by the first light can be suppressed while increasing the light emission efficiency of the second light emitting section 20. Further, in the excitation spectrum of the phosphor 22, the excitation intensity at the minimum value is, for example, less than half, and may be less than one-third, the excitation intensity at the maximum peak.

In this manner, 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 an emission intensity. Therefore, even if a portion of the first light emitted from the first light emitting section 10 enters the second light emitting section 20 due to diffusion or the like, the fluorescent substance 22 is hardly excited by the incident first light. This prevents the phosphor 22 from emitting light of an unintended wavelength due to the first light, and even when the light source module 50 has the first light emitting section 10, the white second light emitted by the second light emitting section 20 is suppressed. Changes in light color are suppressed. In particular, the light emitted by the phosphor 22 has a longer wavelength than the excitation light, so the light emitted by the phosphor 22 excited by the first light is longer than the wavelength of the first light, and the human visibility is As the wavelength increases, it has a large effect on the color of light perceived by humans. For example, human visibility at 400 nm is 10 times greater than human visibility at 380 nm. Therefore, in the second light emitting unit 20, by suppressing the excitation of the phosphor 22 by the first light, it is possible to suppress a change in light color from white, which is suitable for illumination. Furthermore, since the first light is less likely to be absorbed by the phosphor 22, it is possible to suppress a decrease in the amount of the first light including the violet component in the output light. Therefore, the light source module 50 can effectively emit output light that includes a violet component and is used for illumination. Therefore, the output light of the light source module 50 can be used, for example, for illumination that has a myopia suppressing effect.

Further, as shown in FIG. 8, 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 sections 10 and the second light emitting sections 20 included in the light source module 50, the outputs of the first light emitting sections 10 and the second light emitting sections 20, and the like. The spectrum shown in FIG. 8 is, for example, a spectrum of output light when the same current is passed through the first light emitting section 10 and the second light emitting section 20 included in the light source module 50. The output light has the highest emission intensity, for example, at the wavelength of the emission peak of the first light emitting element 11 (approximately 380 nm in this example). Since human visibility is low for light with a violet wavelength, even if the emission intensity at the wavelength of the emission peak of the first light emitting element 11 is high, the effect on the light color of the output light perceived by humans is small, and the violet color of the output light By increasing the amount of ingredients, it is possible to enhance the effect of suppressing myopia in humans.

[Effects etc.]
As described above, the light source module 50 according to the present embodiment is a light source module 50 that emits output light, and includes the first light emitting section 10 that emits the first light, and the second light emitting section that emits the second white light. 20. The first light emitting section 10 has a first light emitting element 11. The second light emitting section 20 includes a second light emitting element 21 and a phosphor 22 that is excited by the light from the second light emitting element 21 and emits light. The output light includes first light and second light. The wavelength of the light emission peak of the first light emitting element 11 is shorter than the wavelength of the light emission peak of the second light emitting element 21, and is 350 nm or more and 410 nm or less. The excitation spectrum of the phosphor 22 has a minimum value in the wavelength range from 350 nm to 410 nm in which the first light emitting element 11 has an emission intensity.

As a result, even if a part of the first light including a violet component emitted from the first light emitting section 10 enters the second light emitting section 20 due to diffusion or the like, the phosphor 22 is unlikely to be excited by the incident first light. Therefore, the phosphor 22 is suppressed from emitting light of an unintended wavelength due to the first light, and even when the light source module 50 has the first light emitting section 10, the white second light emitted by the second light emitting section 20 is suppressed. Color changes are suppressed. That is, in the second light emitting section 20, by suppressing the excitation of the phosphor 22 by the first light, it is possible to suppress a change in the light color from white, which is suitable for illumination. Furthermore, since the first light is less likely to be absorbed by the phosphor 22, it is possible to suppress a decrease in the amount of the first light including the violet component in the output light. Therefore, the light source module 50 can effectively emit output light containing a violet component.

Further, 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.

Thereby, in the second light emitting section 20, excitation of the phosphor 22 by the first light can be further suppressed.

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

As a result, excitation of the phosphor 22 by the first light can be suppressed while increasing the luminous efficiency of the second light emitting section 20.

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

This makes it possible to increase the purple component in the output light. As a result, for example, the effect of suppressing myopia on a person due to the output light can be enhanced.

Furthermore, the lighting fixture 100 according to the present embodiment includes a light source module 50 and a lighting circuit 70 that supplies the light source module 50 with electric power for lighting the light source module 50.

Thereby, it is possible to realize the lighting fixture 100 that can effectively emit output light containing a violet component.

[Modified example]
Next, a modification of the first embodiment will be described. In the following description, differences from Embodiment 1 will be mainly explained, and descriptions of common points will be omitted or simplified.

FIG. 9 is a plan view showing a light source module 50a according to this modification. As shown in FIG. 9, in the light source module 50a, the plurality of first light emitting parts 10 and the plurality of second light emitting parts 20 are not arranged at equal intervals, compared to the light source module 50 according to the first embodiment. They differ in some respects. The light source module 50a is used in the lighting fixture 100 instead of the light source module 50, for example.

The plurality of first light emitting sections 10 include a first light emitting section 10a that is one of the plurality of first light emitting sections 10. Further, the plurality of second light emitting sections 20 include a second light emitting section 20a closest to the first light emitting section 10a among the plurality of second light emitting sections 20, and a second light emitting section 20a closest to the first light emitting section 10a among the plurality of second light emitting sections 20. The closest second light emitting unit 20b is included. The first light emitting section 10a is an example of a first violet light emitting section. The second light emitting section 20a is an example of the 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, the second light emitting section 20a, and the second light emitting section 20b are arranged in a line in this order, for example.

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. As a result, 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, and the first light emitted by the first light emitting section 10a enters the second light emitting section 20a. It becomes difficult. As a result, excitation of the phosphor 22 by the first light is further suppressed. Therefore, it is possible to further suppress a change in the light color of the second light and a decrease in the amount of the first light in the output light.

Moreover, in the light source module 50a, each of the plurality of second light emitting units 20 has a distance to the first light emitting unit 10 closest to itself than a distance to a second light emitting unit 20 other than itself, which is closest to itself. It's also long.

As described above, in the light source module 50a according to the present modification, at least one first light emitting section 10 includes the first light emitting section 10a, and at least one second light emitting section 20 includes the first light emitting section 10a. , a second light emitting section 20a closest to the first light emitting section 10a, and a second light emitting section 20b closest to the second light emitting section 20a. 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.

This makes it difficult for the first light emitted by the first light emitting section 10a to enter the second light emitting section 20a, and further suppresses the first light from exciting the phosphor 22.

(Embodiment 2)
Next, a second embodiment will be described. Below, the explanation will focus on the differences between Embodiment 1 and the modification of Embodiment 1, and the explanation of common points will be omitted or simplified.

FIG. 10 is a block diagram showing the configuration of lighting fixture 200 according to this embodiment. As shown in FIG. 10, lighting fixture 200 differs from lighting fixture 100 according to Embodiment 1 in that it includes a light source module 250 instead of light source module 50.

The light source module 250 has a plurality of light emitting parts including at least one first light emitting part 10 and at least one second light emitting part 20, like the light source module 50, but has a different spectrum of output light from the light source module 50. . The configuration of the light source module 250 is the same as that of the light source module 50, for example, except that a plurality of light emitting parts are configured to emit output light with a spectrum different from that of the light source module 50. The output light emitted by the light source module 250 includes first light emitted by all the first light emitting sections 10 included in the light source module 250 and second light emitted by all the second light emitting sections 20 included in the light source module 250.

The light source module 250 has a different spectrum of output light from the light source module 50 because, for example, the number of first light emitting units 10 and second light emitting units 20 provided is different from that of the light source module 50. Note that the light source module 250 is different from the light source module 50 in that at least one of the light emitting characteristics of the first light emitting element 11, the second light emitting element 21, and the phosphor 22 is different from the light source module 50, so that even if the spectrum of the output light is different from that of the light source module 50, good.

FIG. 11 is a diagram showing an example of the spectrum of output light emitted by the light source module 250 according to this embodiment and the spectrum of sunlight having the same correlated color temperature as the output light. In FIG. 11, the horizontal axis represents wavelength (unit: nm). In FIG. 11, the vertical axis represents the normalized light emission intensity with the maximum value being 1. The spectra of each of the first light and the second light and the excitation spectrum of the phosphor 22 are, for example, the spectra shown in FIGS. 5 to 7, respectively.

The spectrum of the output light shown in FIG. 11 is the spectrum when the correlated color temperature of the output light is 5000K. The spectrum of sunlight shown in FIG. 11 is the spectrum of light from a standard light source (so-called CIE standard illuminant D50) with a D series correlated color temperature of 5000 K defined by the Commission Internationale de l'Eclairage (CIE). In this specification, the spectrum of sunlight can be regarded as the spectrum of light from standard light sources of each correlated color temperature defined by the International Commission on Illumination. That is, in this specification, sunlight can be considered as standard light source light of each correlated color temperature defined by the International Commission on Illumination.

Further, as shown in FIG. 11, the spectrum of the output light is a spectrum obtained by adding the spectrum of the first light shown in FIG. 5 and the spectrum of the second light shown in FIG. 6 at a predetermined ratio. The predetermined ratio is adjusted, for example, by the number of the first light emitting sections 10 and the second light emitting sections 20 included in the light source module 250, the outputs of the first light emitting sections 10 and the second light emitting sections 20, and the like. The spectrum of the output light shown in FIG. 11 is, for example, the spectrum of the output light when the same current is passed through the first light emitting section 10 and the second light emitting section 20 included in the light source module 250.

In the light source module 250, the ratio of the radiant flux in the wavelength range of 360 nm to 400 nm (the range between the dashed lines in FIG. 11) to the total radiant flux in the visible light region of the output light has the same correlated color as the output light. It is the same as 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 of sunlight at a certain temperature. In addition, in the light source module 250, the radiant flux of the output light in the wavelength range of 360 nm to 400 nm per unit 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 that of the output light. It is the same as the radiant flux in the wavelength range of 360 nm or more and 400 nm or less per unit total luminous flux in the visible light region in sunlight with a correlated color temperature. As a result, the output light includes light with a violet component in the same proportion as sunlight, so even if the illumination includes a violet component, the burden on people can be reduced. Therefore, the light source module 250 can emit output light that includes a violet component and is suitable for use in illumination. Therefore, the light source module 250 can be used, for example, for illumination that has a myopia suppressing effect. In addition, since output light containing the violet component, which is missing in general lighting sources, is emitted, it becomes possible to provide more desirable lighting for people.

Note that in this specification, the visible light region can be regarded as a wavelength range of, for example, 360 nm or more and 780 nm or less.

The radiant flux of output light and sunlight corresponds to the area of the spectrum shown in FIG. Therefore, when the wavelength is λ, the spectrum of the output light is P _L (λ), and the spectrum of sunlight is P _S (λ), the total radiant flux Φ _Lall of the output light in the visible light region and 360 nm to 400 nm The radiant flux Φ _Lv in the wavelength range, the total radiant flux Φ _Sall in the visible light region of sunlight, and the radiant flux Φ _Sv in the wavelength range from 360 nm to 400 nm are calculated by the following formula. P _L (λ) and P _S (λ) are functions of wavelength (unit: nm).

Further, when the human visibility is K(λ), the total luminous flux Φ _VLall of the output light in the visible light region and the total luminous flux Φ _VSall of the sunlight in the visible light region are calculated by the following formula. K(λ) is a function of wavelength (unit: nm).

Therefore, in the light source module 250, when the ratio of the radiant flux to the total radiant flux is calculated using the above formula using P _L (λ) and P _S (λ) having the same correlated color temperature as the output light, The radiant flux Φ _Lv /total radiant flux Φ _Lall is the same as the radiant flux Φ _Sv /total radiant flux Φ _Sall . In addition, in the light source module 250, when the radiant flux per unit total luminous flux is calculated using the above formula using P _L (λ) and P _S (λ) having the same correlated color temperature as the output light, the radiant flux is The flux Φ _Lv /total luminous flux Φ _VLall is the same as the radiant flux Φ _Sv /total luminous flux Φ _VSall . In addition, in this specification, being the same means being substantially the same. Here, "substantially the same" means, for example, that there is a difference of ±30% or less regardless of which value is used as a reference. In addition, "substantially the same" may mean a difference of ±20% or less no matter which value is used as the standard, or a difference of ±10% or less no matter which value is used as the standard. It can mean something.

Further, as shown in FIG. 11, the output light has the highest emission intensity at, for example, the wavelength of the emission peak of the second light emitting element 21 (about 450 nm in this example). Further, the number of peaks (maximum) in the spectrum of the output light is three in the example shown in FIG. 11. The number of peaks in the spectrum of the output light is not limited to three, but may be, for example, seven or less, or five or less. Thereby, the light source module 250 can be realized with a simple configuration. Further, the number of peaks in the spectrum of the output light is, for example, three or more.

Note that if the light source module 250 is configured such that the spectral characteristics of the output light and the spectral characteristics of sunlight have the above relationship, the plurality of light emitting parts included in the light source module 250 are not limited to the above example. . For example, the light source module 250 may include a plurality of light emitting sections each having a plurality of LED chips that emit light of different colors instead of the second light emitting section 20.

[Effects etc.]
As described above, the light source module 250 according to this embodiment is a light source module 250 that emits output light, and includes a plurality of light emitting sections. The plurality of light emitting sections include a plurality of light emitting sections that emit light of mutually different colors. The output light includes light emitted from each of the plurality of light emitting sections. In the output light of the light source module 250, 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 is the same as that of sunlight having the same correlated color temperature as the output light of the light source module 250.

As a result, the output light contains violet components in the same proportion as sunlight, so even if the output light includes violet components, the burden on people can be reduced. Therefore, the light source module 250 can emit output light that includes a violet component and is suitable for use in illumination. Moreover, since the above ratio can be calculated using radiant flux, it is possible to use a numerical value directly connected to the energy radiated to a person.

Furthermore, the light source module 250 according to this embodiment is a light source module 250 that emits output light, and includes a plurality of light emitting sections. The plurality of light emitting sections include a plurality of light emitting sections that emit light of mutually different colors. The output light includes light emitted from each of the plurality of light emitting sections. In the output light of the light source module 250, the radiant flux in the wavelength range of 360 nm or more and 400 nm or less per unit total luminous flux in the visible light region is the same as sunlight having the same correlated color temperature as the output light of the light source module 250.

As a result, the output light contains violet components in the same proportion as sunlight, so even if the output light includes violet components, the burden on people can be reduced. Therefore, the light source module 250 can emit output light that includes a violet component and is suitable for use in illumination. Furthermore, since the radiant flux per unit total luminous flux is used, it is easy to apply to lighting design.

Further, for example, the plurality of light emitting units include 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 includes a second light emitting element 21 and a phosphor 22 that is excited by the light from the second light emitting element 21 and emits light. The output light includes first light and second light. The wavelength of the light emission peak of the first light emitting element 11 is shorter than the wavelength of the light emission peak of the second light emitting element 21, and is 360 nm or more and 400 nm or less. The excitation spectrum of the phosphor 22 has a minimum value in a wavelength range from 360 nm to 400 nm, in which the first light emitting element 11 has an emission intensity.

As a result, even if a part of the first light including a violet component emitted from the first light emitting section 10 enters the second light emitting section 20 due to diffusion or the like, the phosphor 22 is unlikely to be excited by the incident first light. Therefore, the phosphor 22 is suppressed from emitting light of an unintended wavelength due to the first light, and even when the light source module 250 has the first light emitting section 10, the white second light emitted by the second light emitting section 20 is suppressed. Color changes are suppressed. Furthermore, since the first light is less likely to be absorbed by the phosphor 22, it is possible to suppress a decrease in the amount of the first light including the violet component in the output light.

Further, 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.

Thereby, in the second light emitting section 20, excitation of the phosphor 22 by the first light can be further suppressed.

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

With this, it is possible to realize the lighting fixture 200 that can emit output light that includes a violet component and is suitable for use in illumination.

[Modified example]
Next, a modification of the second embodiment will be described. In the following description, differences from Embodiment 1, a modification of Embodiment 1, and Embodiment 2 will be mainly explained, and explanations of common points will be omitted or simplified.

FIG. 12 is a block diagram showing the configuration of a lighting fixture 200a according to this modification. As shown in FIG. 12, the lighting fixture 200a is different from the lighting fixture 200 according to the second embodiment in that it includes a light source module 250a instead of the light source module 250, and that it additionally includes a control unit 90. There is a difference.

The light source module 250a includes a first light emitting section 10, a second light emitting section 20, and a third light emitting section 30. That is, the light source module 250a includes the third light emitting section 30 in addition to the configuration of the light source module 250.

The third light emitting unit 30 emits white third light. The output light emitted by the light source module 250a includes the first light emitted by all the first light emitting parts 10 included in the light source module 250a, the second light emitted by all the second light emitting parts 20 included in the light source module 250a, and the light source module 250a. includes the third light emitted by all the third light emitting units 30 included in the third light emitting unit 30 . Note that under the control of the control unit 90, one of the second light emitting unit 20 and the third light emitting unit 30 may not emit light, and the output light may not include one of the second light and the third light.

The third light emitting section 30 has the same configuration as the second light emitting section 20, except that the correlated color temperature of the emitted light is different. The third light emitting section 30 includes, for example, a light emitting element, a phosphor, a sealing member, and a package, similarly to the second light emitting section 20 shown in FIG. 4 . The light emitting element, phosphor, sealing member, and package of the third light emitting section 30 may have the configurations exemplified in the second light emitting element 21, the phosphor 22, the sealing member 25, and the package 27 of the second light emitting section 20. . For example, the excitation spectrum of the phosphor included in the third light emitting section 30 may have a minimum value in a wavelength range from 360 nm to 400 nm in which the first light emitting element 11 has an emission intensity. The third light emitting unit 30 has at least one of the output characteristics of the light emitting element and the type and amount of the phosphor 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 element. This is different from part 20.

In the light source module 250a, the lighting of the first light emitting section 10, the second light emitting section 20, and the third light emitting section 30 is controlled independently. In the light source module 250a, for example, the first light emitting section 10, the second light emitting section 20, and the third light emitting section 30 are mounted on a substrate so that power can be supplied independently.

The control unit 90 controls the light emission of the light source module 250a. For example, the control section 90 adjusts the output of each of the first light emitting section 10, the second light emitting section 20, and the third light emitting section 30. For example, the control unit 90 independently supplies power to the first light emitting unit 10, the second light emitting unit 20, and the third light emitting unit 30 using the lighting circuit 70, and changes the amount of current individually. Adjust the amount of each of the first light, second light, and third light. Thereby, the control unit 90 changes the correlated color temperature of the output light. Note that when power is supplied by the control unit 90 using the lighting circuit 70, some light emitting units may not be supplied with power depending on the correlated color temperature of the target output light. Furthermore, the control of the outputs of the first light emitting section 10, the second light emitting section 20, and the third light emitting section 30 by the control section 90 may be PWM (Pulse Width Modulation) control.

Note that the control unit 90 is realized by, for example, an LSI (Large Scale Integration) that is an integrated circuit (IC). Note that the integrated circuit is not limited to an LSI, and may be a dedicated circuit or a general-purpose processor. For example, the control unit 90 may be a microcontroller. A microcontroller includes, for example, a nonvolatile memory in which a program is stored, a volatile memory that is a temporary storage area for executing the program, an input/output port, a processor that executes the program, and the like. Further, the control unit 90 may be a programmable FPGA (Field Programmable Gate Array) or a reconfigurable processor in which connections and settings of circuit cells within the LSI can be reconfigured. The functions executed by the control unit 90 may be realized by software or hardware.

FIG. 13 is an xy chromaticity diagram of the CIE1931 color space for explaining an example of a change in the correlated color temperature of output light in the lighting fixture 200a according to this modification. FIG. 13 shows a case where the second light emitting section 20 emits the second light with the chromaticity coordinate L2, and the third light emitting section 30 emits the third light with the chromaticity coordinate L3.

In the example shown in FIG. 13, the correlated color temperature of the second light is 6500K, and the correlated color temperature of the third light is 3000K. Note that the correlated color temperature of the second light and the third light is not particularly limited, and is set according to the range in which the correlated color temperature of the output light is desired to be adjusted. Furthermore, in the example shown in FIG. 13, the chromaticity coordinate L2 of the second light and the chromaticity coordinate L3 of the third light are chromaticity coordinates on the blackbody radiation locus, but they are far from the blackbody radiation locus. It's okay. Further, at least one of the chromaticity coordinate L2 of the second light and the chromaticity coordinate L3 of the third light may be a chromaticity coordinate outside the specified range of correlated color temperature.

Although the output light includes the first light in addition to the second light and the third light, the first light has a small influence on the correlated color temperature of the output light. Therefore, the correlated color temperature of the output light is approximately determined by the ratio of the light amounts of the second light and the third light. In the following description, in order to simplify the explanation, it will be assumed that the correlated color temperature of the output light is determined by the ratio of the light amounts of the second light and the third light.

The control unit 90 controls the ratio of the output of the second light emitting unit 20 and the output of the third light emitting unit 30 to convert the chromaticity coordinates of the light in which the second light and the third light are mixed into chromaticity coordinates. It is changed between L2 and chromaticity coordinate L3. Due to 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.

Further, the control unit 90 controls the output light so 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 is within the visible light region of sunlight having the same correlated color temperature as the output light. The correlated color temperature of the output light is changed so that the ratio of the radiant flux in the wavelength range of 360 nm to 400 nm to the total radiant flux is the same. The control unit 90 also controls the control unit 90 to control how the radiant flux in the wavelength range of 360 nm or more and 400 nm or less per unit total luminous flux in the visible light region of the output light is the unit in the visible light region of sunlight having the same correlated color temperature as the output light. The correlated color temperature of the output light is changed so that the radiant flux in the wavelength range of 360 nm or more and 400 nm or less per total luminous flux is the same. At this time, the control unit 90 controls, for example, to increase the output of the first light emitting unit 10 when increasing the correlated color temperature of the output light, and controls the output of the first light emitting unit 10 to increase when decreasing the correlated color temperature of the output light. Control is performed to reduce the output of the light emitting section 10. For example, the control unit 90 creates a data table that associates the correlated color temperature of the output light with the amount of power supplied (current amount) to each of the first light emitting unit 10, the second light emitting unit 20, and the third light emitting unit 30. is held, and based on the data table, the power supplied from the lighting circuit 70 to the light source module 250a is controlled so as to achieve a desired correlated color temperature of output light. The data table can be designed from the output characteristics of the first light emitting section 10, the second light emitting section 20, and the third light emitting section 30, and the spectra of the first light, second light, and third light.

As described above, the lighting fixture 200a according to this modification includes the control section 90 that changes the correlated color temperature of output light by adjusting the output of each of the plurality of light emitting sections of the light source module 250a. For example, in the output light of the light source module 250a, the control unit 90 may control 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 from sunlight with the same correlated color temperature as the output light of the light source module 250a. The correlated color temperature of the output light of the light source module 250a is changed so that the correlated color temperature is the same as that of the light. For example, the control unit 90 may control the control unit 90 so that the output light of the light source module 250a has a radiant flux in a wavelength range of 360 nm or more and 400 nm or less per unit total luminous flux in the visible light region, which has the same correlated color temperature as the output light of the light source module 250a. The correlated color temperature of the output light of the light source module 250a is changed so that it is the same as sunlight.

As a result, even when changing the correlated color temperature of the output light, the proportion of the violet component of the output light matches the sunlight at each correlated color temperature, so the burden on people can be reduced.

(others)
Although the light source module and lighting fixture according to the present invention have been described above based on the above embodiments and modifications, the present invention is not limited to the above embodiments and modifications.

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 EL (Electroluminescence) element.

Furthermore, for example, the second light emitting section 20 may include a sintered body of the phosphor 22 instead of the sealing member 25 in which the phosphor 22 is dispersed. Further, the second light emitting section 20 may be a remote phosphor type light emitting module.

In addition, forms obtained by applying various modifications to each embodiment and each modification example that those skilled in the art can think of, and components and functions of each embodiment and each modification example are modified without departing from the spirit of the present invention. The present invention also includes forms realized by arbitrary combinations.

10, 10a first light emitting section 11 first light emitting element 20, 20a, 20b second light emitting section 21 second light emitting element 22 phosphor 50, 50a, 250, 250a light source module 70 lighting circuit 90 control section 100, 200, 200a illumination utensil

Claims (10)

1. A light source module that emits output light,
   Equipped with multiple light emitting parts,
   The plurality of light emitting units include light emitting units that emit light of mutually different colors,
   The output light includes light emitted by each of the plurality of light emitting parts,
   In the output light, 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 is the same as that of sunlight having the same correlated color temperature as the output light.
   light source module.
2. The plurality of light emitting parts are
   a first light emitting section that has a first light emitting element and emits first light;
   a second light emitting section that includes a second light emitting element and a phosphor that emits light when excited by the light from the second light emitting element, and that emits white second light;
   The wavelength of the emission peak of the first light emitting element is shorter than the wavelength of the second emission peak of the second light emitting element, and is 360 nm or more and 400 nm or less,
   The excitation spectrum of the phosphor has a minimum value in a wavelength range of 360 nm or more and 400 nm or less in which the first light emitting element has an emission intensity.
   The light source module according to claim 1.
3. The excitation spectrum has a minimum value within the half width of the emission peak of the first light emitting element.
   The light source module according to claim 2.
4. The light source module according to any one of claims 1 to 3,
   a lighting circuit that supplies power for lighting the light source module to the light source module;
   lighting equipment.
5. further comprising a control unit that changes the correlated color temperature of the output light by adjusting the output of each of the plurality of light emitting units,
   The control unit is configured such that, in the output light, a ratio of radiant flux in a wavelength range of 360 nm to 400 nm to the total radiant flux in the visible light region is the same as that of sunlight having the same correlated color temperature as the output light. changing the correlated color temperature of the output light;
   The lighting fixture according to claim 4.
6. A light source module that emits output light,
   Equipped with multiple light emitting parts,
   The plurality of light emitting units include light emitting units that emit light of mutually different colors,
   The output light includes light emitted by each of the plurality of light emitting parts,
   In the output light, the radiant flux in the wavelength range of 360 nm or more and 400 nm or less per unit total luminous flux in the visible light region is the same as sunlight having the same correlated color temperature as the output light.
   light source module.
7. The plurality of light emitting parts are
   a first light emitting section that has a first light emitting element and emits first light;
   a second light emitting section that includes a second light emitting element and a phosphor that emits light when excited by the light from the second light emitting element, and that emits white second light;
   The wavelength of the emission peak of the first light emitting element is shorter than the wavelength of the second emission peak of the second light emitting element, and is 360 nm or more and 400 nm or less,
   The excitation spectrum of the phosphor has a minimum value in a wavelength range of 360 nm or more and 400 nm or less in which the first light emitting element has an emission intensity.
   The light source module according to claim 6.
8. The wavelength at which the excitation spectrum shows the minimum value is within the half width of the emission peak of the first light emitting element.
   The light source module according to claim 7.
9. The light source module according to any one of claims 6 to 8,
   a lighting circuit that supplies power for lighting the light source module to the light source module;
   lighting equipment.
10. The lighting fixture further includes a control unit that changes the correlated color temperature of the output light by adjusting the output of each of the plurality of light emitting units,
    The control unit controls the output light so that a radiant flux in a wavelength range of 360 nm or more and 400 nm or less per unit total luminous flux in the visible light region is the same as sunlight having the same correlated color temperature as the output light. Change the correlated color temperature of the output light,
    The lighting fixture according to claim 9.

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