JP7133774B2 - lighting equipment - Google Patents

Description

The present invention relates to lighting devices.

2. Description of the Related Art Conventionally, there has been known a lighting device that adjusts colors by using two light-emitting units with different light colors depending on the purpose of use, the usage situation, or the like (see, for example, Patent Document 1).

JP 2013-096836 A

YANG CHAOPU et. Al, "Change of blue light hazard and circadian effect of LED backlight displayer with color temperature and age", Optics Express, OSA Publishing, 2018, Vol. 26, No. 21, pp. 27021-27032

In general, when adjusting the color of light emitted from an illumination device, the color is adjusted based on the characteristics measured by an integrating sphere or the like. However, if the light emitted by the lighting device is toned based on the characteristics measured by an integrating sphere or the like, the light color may differ from the light color that people actually see. For example, it is known that the crystalline lens of the human eye decreases in light transmittance with aging, and the decrease in light transmittance is particularly remarkable in the short wavelength range (see, for example, Non-Patent Document 1). Therefore, even if the lighting environment is the same, as the age increases, the person feels darker, or the colors red and yellow become stronger.

The present invention has been made to solve such problems, and is a lighting device that can adjust the emitted light according to the age group of the user of the lighting space to the light that the user feels in the same lighting environment. The purpose is to provide an instrument.

To achieve the above object, a lighting device according to one aspect of the present invention has a first light emitting section that emits first light having a first emission spectrum, and a second emission spectrum, and combines the light with the first light. a second light emitting unit that emits a second light that is emitted from the first light emitting unit; and a control unit that adjusts the output of each of the first light emitting unit and the second light emitting unit. A characteristic is a first characteristic, a second characteristic is a light transmission characteristic of a human crystalline lens included in a second age group higher than the first age group, and a filter having the first characteristic is provided with the first A spectrum of light obtained by transmitting light is defined as a third emission spectrum, and a spectrum of light obtained by transmitting combined light of the first light and the second light through a filter having the second characteristic is defined as a third emission spectrum. 4 emission spectrums, and when each of the third emission spectrum and the fourth emission spectrum is normalized with the emission intensity at the maximum peak wavelength as 1, in the first wavelength range of 470 nm or more and 530 nm or less, at each wavelength, The difference between the emission intensity in the third emission spectrum after normalization and the emission intensity in the fourth emission spectrum after normalization is within 20% of the emission intensity in the third emission spectrum after normalization, and 560 nm In the second wavelength region of 580 nm or less, the difference between the emission intensity in the third emission spectrum after normalization and the emission intensity in the fourth emission spectrum after normalization at each wavelength is It is within 20% of the emission intensity in the third emission spectrum.

According to the illuminating device of the present invention, it is possible to adjust the emitted light to match the age group of the user of the lighting space so that the user feels the same lighting environment.

FIG. 1 is a diagram showing a schematic configuration of a lighting device according to an embodiment. FIG. 2 is a schematic plan view of the light-emitting module according to the embodiment. FIG. 3 is a diagram showing an example of the light transmittance of the human crystalline lens. 4A is a diagram showing the spectrum of the first light according to Example 1, Comparative Examples 1 and 2. FIG. FIG. 4B is a diagram showing a spectrum obtained by normalizing the spectrum shown in FIG. 4A. FIG. 5 is a diagram showing the spectrum of light emitted by the first green phosphor and the second green phosphor according to Example 1, Comparative Example 1, and Comparative Example 2. FIG. 6A is a diagram showing spectra of the second light according to Example 1 and Comparative Example 2. FIG. 6B is a diagram showing an example of the spectrum of the combined light of the first light and the second light according to Example 1 and Comparative Example 2. FIG. 7A is a diagram illustrating a normalized spectrum when light emitted by the lighting device according to the first embodiment is transmitted through a filter; FIG. FIG. 7B is an enlarged view of the spectrum of FIG. 7A in the wavelength range from 450 nm to 550 nm. FIG. 8A is a diagram showing a spectrum after normalization when light emitted by the lighting device according to Comparative Example 2 is transmitted through a filter. FIG. 8B is an enlarged view of the spectrum of FIG. 8A in the wavelength range from 450 nm to 550 nm.

(Embodiment)
Hereinafter, embodiments will be specifically described with reference to the drawings. It should be noted that the embodiments described below are all comprehensive or specific examples. Numerical values, shapes, materials, constituent elements, arrangement positions of constituent elements, connection modes, and the like shown in the following embodiments are examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in independent claims representing the highest concept will be described as arbitrary constituent elements. In addition, they are schematic diagrams that have been appropriately emphasized, omitted, or adjusted in proportion to show the present invention, and are not necessarily strictly illustrated, and may differ from the actual shape, positional relationship, and proportion. .

[Constitution]
First, the configuration of a lighting device according to this embodiment will be described with reference to FIGS. 1 and 2. FIG.

FIG. 1 is a diagram showing a schematic configuration of a lighting device 100 according to this embodiment. As shown in FIG. 1 , lighting device 100 includes first light emitting unit 10 , second light emitting unit 20 , and control unit 30 . Also, the first light emitting unit 10 and the second light emitting unit 20 are mounted on the light emitting module 50 . The lighting device 100 is, for example, a ceiling light installed on the ceiling as shown in FIG. 1, and may be a base light, a downlight, a light bulb, or the like.

The first light emitting unit 10 and the second light emitting unit 20 are light emitting units that emit light of different chromaticities. The first light emitting section 10 emits first light having a first emission spectrum, and the second light emitting section 20 emits second light having a second emission spectrum and combined with the first light.

The control unit 30 receives control information from the outside and adjusts the output of each of the first light emitting unit 10 and the second light emitting unit 20 . For example, the control unit 30 supplies power to the first light emitting unit 10 and the second light emitting unit 20 independently from a power supply circuit, and individually changes the amount of current to control the light amount of each of the first light and the second light. to adjust. Thereby, the spectrum of the combined light generated by mixing the first light and the second light can be changed, and light control and color control are possible. Specifically, the control unit 30 includes a light control switch, a power supply circuit, a control circuit, and the like. The control unit 30 may further include a processor, microcomputer, or the like. Also, the control unit 30 may include a communication module or the like for remote control.

Next, the first light emitting section 10 and the second light emitting section 20 will be described in detail. FIG. 2 is a schematic plan view of a light-emitting module 50 on which the first light-emitting portion 10 and the second light-emitting portion 20 are mounted. As shown in FIG. 2, the light emitting module 50 has a plurality of substrates 40, and a plurality of first light emitting units 10 and a plurality of second light emitting units 20 mounted on each of the plurality of substrates 40. . The light-emitting module 50 is attached inside the lighting device 100 so that the surface on which the plurality of first light-emitting units 10 and the plurality of second light-emitting units 20 are mounted faces the ceiling.

Each of the plurality of substrates 40 is a printed wiring board for mounting the plurality of first light emitting units 10 and the plurality of second light emitting units 20, and is formed in a substantially arc shape. As the substrate 40, for example, a resin substrate, a metal base substrate, a ceramic substrate, a glass substrate, or the like can be used.

The plurality of first light emitting units 10 are mounted on the inner peripheral side of the mounting surface of each substrate 40 . Specifically, the plurality of first light emitting units 10 are arranged in an arc shape at intervals along the circumferential direction of each substrate 40 on the inner peripheral side of the mounting surface of each substrate 40 . Thus, in the light emitting module 50 as a whole, the plurality of first light emitting units 10 are arranged in an annular shape.

The plurality of second light emitting units 20 are mounted on the outer peripheral side of the mounting surface of each substrate 40 . Specifically, the plurality of second light emitting units 20 are arranged in an arc shape at intervals in the circumferential direction of each substrate 40 on the outer peripheral side of the mounting surface of each substrate 40 . Accordingly, in the light emitting module 50 as a whole, the plurality of second light emitting sections 20 are arranged in an annular shape so as to surround the plurality of first light emitting sections 10 . By arranging the plurality of first light emitting units 10 and the plurality of second light emitting units 20 in the light emitting module 50 in this manner, the illumination device 100 can emit combined light of the first light and the second light. can.

The numbers of the first light emitting units and the second light emitting units 20 are not particularly limited, and may be set according to the purpose of use. Also, the arrangement of the first light emitting section and the second light emitting section 20 on the substrate 40 is not particularly limited, and the arrangement may be changed according to the purpose of use. For example, the plurality of first light emitting units 10 may be arranged in an annular shape so as to surround the plurality of second light emitting units 20, and the first light emitting units 10 and the second light emitting units 20 are arranged alternately. They may be arranged in an annular shape.

Each of the first light emitting unit 10 and the second light emitting unit 20 is, for example, a packaged SMD (Surface Mount Device) type light emitting device. The first light emitting unit 10 includes a container 16 having a recess recessed in the depth direction perpendicular to the paper surface, a sealing member 15 enclosed in the recess, a first light emitting element 11 mounted in the center of the bottom surface of the recess, and a first fluorescent member 14 dispersed in the sealing member 15 . The second light emitting unit 20 includes a container 26 having a recess recessed in the depth direction perpendicular to the paper surface, a sealing member 25 enclosed in the recess, a second light emitting element 21 mounted in the center of the bottom surface of the recess, and a second fluorescent member 24 dispersed in the sealing member 25 . Although illustration is omitted, the plurality of first light emitting portions 10 and the plurality of second light emitting portions 20 on each substrate 40 are connected by wiring, respectively, and the plurality of first light emitting portions 10 and the plurality of second light emitting portions 20 are connected. Power is supplied independently from the light emitting unit 20 .

The first light emitting unit 10 and the second light emitting unit 20 may be remote phosphor type light emitting devices. Also, the first light emitting unit 10 and the second light emitting unit 20 may be COB (Chip On Board) type light emitting devices.

The first light emitting element 11 and the second light emitting element 21 are, for example, LEDs that emit blue light with a peak emission wavelength of 430 nm or more and 470 nm or less, and LEDs that emit blue light with a peak emission wavelength of 440 nm or more and 460 nm or less. may By setting the peak wavelength of light emission to 430 nm or more, the general color rendering index of the light emitted from the first light emitting element 11 tends to be high, and by setting the peak wavelength of light emission to 470 nm or less, high light emission efficiency can be easily obtained. The first light emitting element 11 and the second light emitting element 21 may be the same type of LED, or may be different types of LEDs. From the viewpoint of equalizing characteristic changes due to aging and improving the reproducibility of white light, it is preferable that the first light emitting element 11 and the second light emitting element 21 are the same type of LED.

The first fluorescent member 14 is excited by part of the light from the first light emitting element 11 and emits light. Thereby, the first light emitting unit 10 mixes the light emitted by the first light emitting element 11 and the light emitted by the first fluorescent member 14 to emit the first light. The first fluorescent member 14 is composed of the red phosphor 12 and the first green phosphor 13 . The compounding ratio and compounding amount of the red phosphor 12 and the first green phosphor 13 are adjusted so as to obtain the desired spectral shape of the first light.

The red phosphor 12 is a phosphor that is excited by the light from the first light emitting element 11 and emits red light with a peak emission wavelength of 620 nm or more and 700 nm or less, for example. Specific examples of the red phosphor ₁₂ include _CaAlSiN3 :Eu, ₍ Ca,Sr) _AlSiN3 :Eu, _Ca2Si5N8 :Eu, ₍ Ca,Sr) _2Si5N8 :Eu, and _KSiF . ₆ :Mn, _KTiF6 :Mn and the like. As the red phosphor 12, one type of phosphor may be used, or a mixture of a plurality of types of phosphors may be used.

The first green phosphor 13 is a phosphor that is excited by the light from the first light emitting element 11 and emits green light with a peak emission wavelength of, for example, 500 nm or more and 570 nm or less. From the viewpoint of improving the color rendering properties of the light emitted by the first light emitting section 10, it is preferable that the phosphor emits green light having a peak emission wavelength of 540 nm or more and 570 nm or less. Examples of the first green phosphor 13 include Lu ₃ Al ₅ O ₁₂ :Ce, Y ₃ (Ga,Al) ₅ O ₁₂ :Ce, Ca ₃ Sc ₂ Si ₃ O ₁₂ :Ce, and CaSc ₂ O ₄ :Eu. , (Ba, Sr) ₂ SiO ₄ :Eu, Ba ₃ Si ₆ O ₁₂ N ₂ : Eu, (Si, Al) ₆ (O, N) ₈ : Eu, (Y, Lu) ₃ Al ₅ O ₁₂ : Ce etc. Among these, the first green phosphor 13 is preferably an yttrium _- aluminum-garnet (YAG) phosphor such as _Y3 (Ga,Al) _5O12 :Ce. As the first green phosphor 13, one type of phosphor may be used, or a plurality of types of phosphors may be mixed and used.

The second fluorescent member 24 is excited by part of the light from the second light emitting element 21 and emits light. Thereby, the second light emitting section 20 mixes the light emitted by the second light emitting element 21 and the light emitted by the second fluorescent member 24 to emit the second light. The second fluorescent member 24 is composed of the second green phosphor 22 . The blending amount of the second green phosphor 22 is adjusted so as to obtain the desired spectral shape of the second light. From the viewpoint of facilitating adjustment of the light color of the light emitted by the lighting device 100 , the peak wavelength of light emitted from the second fluorescent member 24 is preferably shorter than the peak wavelength of light emitted from the first fluorescent member 14 .

The second green phosphor 22 is a phosphor that is excited by the light from the second light emitting element 21 and emits green light with a peak emission wavelength of 500 nm or more and 570 nm or less, for example. From the viewpoint of facilitating adjustment of the light color of the light emitted by the illumination device 100, the peak wavelength of the light emission of the second green phosphor 22 is preferably shorter than the peak wavelength of light emission of the first green phosphor 13, and is in the range of 510 nm to 540 nm. It should be below. Examples of the second green phosphor 22 include Lu ₃ Al ₅ O ₁₂ :Ce, Y ₃ (Ga, Al) ₅ O ₁₂ :Ce, Ca ₃ Sc ₂ Si ₃ O ₁₂ :Ce, and CaSc ₂ O ₄ :Eu. , (Ba, Sr) ₂ SiO ₄ :Eu, Ba ₃ Si ₆ O ₁₂ N ₂ : Eu, (Si, Al) ₆ (O, N) ₈ : Eu, (Y, Lu) ₃ Al ₅ O ₁₂ : Ce etc. Among these, the second green phosphor 22 is preferably a lutetium-aluminum-garnet (LuAG) phosphor such as Lu ₃ Al ₅ O ₁₂ :Ce. As the second green phosphor 22, one kind of phosphor may be used, or a mixture of plural kinds of phosphors may be used.

The sealing member 15 is a translucent resin material that seals the first light emitting element 11 and in which the first fluorescent member 14 is dispersed. The sealing member 25 is a translucent resin material that seals the second light emitting element 21 and in which the second fluorescent member 24 is dispersed. The translucent resin material of the sealing member 15 and the sealing member 25 is not particularly limited, but for example, silicone resin, epoxy resin, urea resin, or the like is used.

The container 16 is a container that accommodates the first light emitting element 11 and the sealing member 15 . Also, the container 26 is a container that accommodates the second light emitting element 21 and the sealing member 25 . The material of container 16 and container 26 is, for example, metal, ceramic, or resin. Aluminum oxide (alumina), aluminum nitride, or the like is used as the ceramic. Moreover, as the metal, for example, an aluminum alloy, an iron alloy, a copper alloy, or the like having an insulating film formed on the surface is adopted. As the resin, for example, glass epoxy made of glass fiber and epoxy resin is used. As for the materials of the container 16 and the container 26, the above materials may be used in combination.

[motion]
Next, the operation of lighting device 100 according to the present embodiment will be described.

When power is supplied to the lighting device 100, the first light emitting unit 10 emits the first light having the first emission spectrum and the second light emitting unit 20 emits the first light having the second emission spectrum under the control of the control unit 30. A second light is emitted. Thereby, the first light and the second light are mixed to generate combined light. The control unit 30 individually adjusts the amount of current to the first light emitting unit 10 and the second light emitting unit 20, and changes the light amount of each of the first light and the second light, thereby performing dimming and toning. . Note that only the first light emitting unit 10 may emit light.

Next, the light transmission characteristics of the human crystalline lens will be described with reference to FIG. FIG. 3 is a diagram showing an example of the light transmittance of the human crystalline lens described in Non-Patent Document 1. As shown in FIG. As shown in FIG. 3, the light transmittance of the human crystalline lens decreases as the age increases, and the decrease in light transmittance is particularly noticeable in the short wavelength region. In this specification, the age group is, for example, teenagers and 80s, and indicates a certain age range.

Here, in the present embodiment, the relationship between the light transmittance of the human crystalline lens and the light emitted by lighting device 100 is as follows. Let the light transmission characteristics of the human crystalline lens included in the first age group be the first characteristic, and let the light transmission characteristic of the human crystalline lens included in the second age group higher than the first age group be the second characteristic. . A spectrum of light obtained by assuming that the first light is transmitted through a filter having a first characteristic is defined as a third emission spectrum, and a filter having a second characteristic combines the first light and the second light. A spectrum of light obtained by assuming that light is transmitted is referred to as a fourth emission spectrum. In other words, the spectrum that a person in the first age group senses when exposed to only the first light is the third emission spectrum, and the spectrum that a person in the second age group senses when exposed to the synthetic light is the fourth emission spectrum. becomes. An example of the light transmission properties of the filter is, for example, the light transmission of the human lens shown in FIG.

Then, lighting device 100 satisfies the following two conditions when each of the third emission spectrum and the fourth emission spectrum is normalized with the emission intensity at the maximum peak wavelength being 1. (1) In the first wavelength range of 470 nm or more and 530 nm or less, the difference between the emission intensity in the third emission spectrum after normalization and the emission intensity in the fourth emission spectrum after normalization at each wavelength is within 20% of the emission intensity in the third emission spectrum of (2) In the second wavelength range of 560 nm or more and 580 nm or less, the difference between the emission intensity in the third emission spectrum after normalization and the emission intensity in the fourth emission spectrum after normalization at each wavelength is within 20% of the emission intensity in the third emission spectrum of

By satisfying these conditions, the third emission spectrum after normalization felt when a person in the first age group was irradiated only with the first light, and the third emission spectrum after the normalization felt when a person in the second age group was irradiated with the synthetic light The fourth emission spectrum after normalization felt in the case has a similar shape.

For example, in a lighting environment where the first age group is the user, the lighting device 100 emits only the first light, and in a lighting environment where the second age group is the user, the lighting device 100 emits the combined light. do. In this case, the users in the first age group and the users in the second age group have similar shapes of light spectrums that they perceive, so that each user can perceive the same lighting environment. In this way, the lighting device 100 can adjust the emitted light to match the age group of the user of the lighting space, so that the user feels the same lighting environment. Detailed spectral shapes will be described below using examples and comparative examples.

[Examples and Comparative Examples]
Next, the spectrum of the light emitted by the illumination device 100 will be specifically described using examples and comparative examples.

In the following examples and comparative examples, it is assumed that the first age group is teenagers and the second age group is eighties. Also, let the light transmission characteristics of the lens of a person in their teens shown in FIG.

<Comparative Example 1>
First, the spectrum of light emitted by the lighting device according to Comparative Example 1 will be described with reference to FIGS. 4A and 4B.

The lighting device according to Comparative Example 1 is a lighting device that includes only the first light-emitting portion of the two light-emitting portions of the lighting device 100 described above. The first light emitting section has a first light emitting element and a first fluorescent member composed of a red phosphor and a first green phosphor. The first light emitting element is an LED having an emission peak wavelength of 450 nm. A red phosphor is a phosphor having an emission peak wavelength of 640 nm. The first green phosphor is a YAG phosphor having an emission peak wavelength of 545 nm. The first green phosphor is a YAG phosphor that emits light of spectrum S7 shown in FIG. 5, which will be described later. With these configurations, in the lighting device according to Comparative Example 1, the first light emitting section emits the first light.

4A is a diagram showing the spectrum of the first light according to Example 1, Comparative Examples 1 and 2. FIG. In Comparative Example 1, since only the first light emitting section is provided, the spectrum of the first light is the spectrum of the light emitted by the lighting device. In FIG. 4A, spectrum S1 is the first emission spectrum of the first light according to Comparative Example 1. In FIG. The spectrum S1 is realized by adjusting the compounding ratio and compounding amount of the red phosphor and the first green phosphor. A spectrum S2 is a spectrum of light obtained when the first light according to Comparative Example 1 is transmitted through a filter having the first characteristic. A spectrum S3 is a spectrum of light obtained when the first light according to Comparative Example 1 is transmitted through a filter having the second characteristic. Example 1 and Comparative Example 2 will be described later.

As shown in FIG. 4A, the spectrum S2 and the spectrum S3 of the first light transmitted through the filter having the first characteristic and the second characteristic are compared to the spectrum S1 of the first light transmitted through no filter. , the emission intensity decreases overall. In particular, the decrease in emission intensity of spectrum S3 is remarkable. In other words, the light transmission characteristics of the lens of a person in their teens are the first characteristic, and the light transmission characteristics of the lens of a person in their eighties are the second characteristic. Emission intensity decreases. The spectrum S3 has a low emission intensity on the low wavelength side. Compared with the light of the spectrum S1, the light of the spectrum S3 has strong red and yellow colors, and the relative color temperature of the spectrum S3 is about 3500K. In other words, people in their 80s tend to perceive the same light to be darker than people in their teens, and to perceive the light to be relatively strong in red and yellow.

FIG. 4B is a diagram showing spectra obtained by normalizing the spectrum S1, the spectrum S2, and the spectrum S3 shown in FIG. 4A by the maximum value of each spectrum. Spectrum S4, spectrum S5, and spectrum S6 are spectra obtained by normalizing spectrum S1, spectrum S2, and spectrum S3, respectively. That is, the spectrum shown in FIG. 4B is a spectrum obtained when the decrease in emission intensity due to transmission through the filters with the first and second characteristics is compensated for by increasing the amount of light. As shown in FIG. 4B, the light indicated by the spectrum S6 has a higher light amount than the light indicated by the spectrum S3 before normalization, and becomes equivalent to the lights of the spectrums S4 and S5. However, the shape of spectrum S6 remains relatively low in emission intensity on the lower wavelength side. Therefore, people in their 80s corresponding to the filter of the spectrum S6 have improved perceived brightness, but still perceive light with strong red and yellow colors. Therefore, in the lighting device that emits only the first light as in Comparative Example 1, people in their teens corresponding to the spectrum S5 filter and people in their 80s corresponding to the spectrum S6 feel the same lighting environment. cannot be adjusted to

<Example 1 and Comparative Example 2>
Next, the spectrum of light emitted by the lighting devices according to Example 1 and Comparative Example 2 of the embodiment will be described with reference to FIGS. 5 to 8B.

The lighting devices according to Example 1 and Comparative Example 2 have the same configuration as the lighting device 100 described above, and include a first light emitting section, a second light emitting section, and a control section. The first light emitting section has a first light emitting element and a first fluorescent member composed of a red phosphor and a first green phosphor. The second light emitting section has a second light emitting element and a second fluorescent member made of a second green phosphor.

The first light emitting unit according to Example 1 and Comparative example 2 uses the same light emitting unit as the first light emitting unit according to Comparative example 1 above. Therefore, the first emission spectrum of the first light according to Example 1 and Comparative Example 2 has the same shape as the spectrum S1 shown in FIG. 4A. The second light emitting elements according to Example 1 and Comparative Example 2 are LEDs having an emission peak wavelength of 450 nm. Here, FIG. 5 is a diagram showing the spectrum of light emitted by the first green phosphor and the second green phosphor according to Example 1, Comparative Example 1, and Comparative Example 2. FIG. As described above, the first green phosphor according to Comparative Example 1 is a YAG phosphor that emits light of spectrum S7 having a peak wavelength of 545 nm shown in FIG. is. The second green phosphor according to Example 1 is a LuAG phosphor that emits light of spectrum S8 having a peak wavelength of 530 nm shown in FIG. The second green phosphor according to Comparative Example 2 is a YAG phosphor that emits light of spectrum S7 having a peak wavelength of 545 nm shown in FIG. That is, in Comparative Example 2, the same phosphor is used for the first green phosphor and the second green phosphor. Further, as can be seen by comparing the spectrum S7 and the spectrum S8, the second green phosphor according to Example 1 uses a phosphor having a shorter emission peak wavelength than the first green phosphor according to Example 1. ing. Thereby, the peak wavelength of light emission of the second fluorescent member according to the first embodiment becomes shorter than the peak wavelength of light emission of the first fluorescent member according to the first embodiment. With these configurations, in the lighting devices according to Example 1 and Comparative Example 2, the first light emitting units emit the first light, and the second light emitting units emit the second light.

6A is a diagram showing spectra of the second light according to Example 1 and Comparative Example 2. FIG. A spectrum S9 in FIG. 6A is the second emission spectrum of the second light according to the first embodiment. The spectrum S9 is realized by adjusting the compounding amount of the second green phosphor according to the first embodiment. A spectrum S10 in FIG. 6 is the second emission spectrum of the second light according to the second comparative example. Spectrum S10 is realized by adjusting the compounding amount of the second green phosphor according to Comparative Example 2. FIG.

6B is a diagram showing an example of the spectrum of the combined light of the first light and the second light according to Example 1 and Comparative Example 2. FIG. A spectrum S11 in FIG. 6B is a spectrum of combined light of the first light and the second light according to the first embodiment. The spectrum S11 is realized by adjusting the light amounts of the first light and the second light according to the first embodiment. A spectrum S12 in FIG. 6B is a spectrum of combined light of the first light and the second light according to Comparative Example 2. In FIG. The spectrum S12 is realized by adjusting the light amounts of the first light and the second light according to the second comparative example.

As shown in FIG. 6A, the spectrum S9 of the second light according to Example 1 has a higher emission intensity in the wavelength range of 470 nm or more and 580 nm or less than the spectrum S10 of the second light according to Comparative Example 2. Shape. Due to this effect, as shown in FIG. 6B, the spectrum S11 of the synthetic light according to Example 1 also has a higher emission intensity in the wavelength range of 470 nm or more and 580 nm or less than the spectrum S12 of the synthetic light according to Comparative Example 2. It has a high spectral shape.

First, the spectrum of light emitted by the lighting device according to the first embodiment will be described. 7A is a diagram illustrating a normalized spectrum when light emitted by the lighting device according to the first embodiment is transmitted through a filter; FIG. FIG. 7B is an enlarged view of the spectrum of FIG. 7A in the wavelength range from 450 nm to 550 nm. A spectrum S13 in FIGS. 7A and 7B is a third emission spectrum obtained by normalizing the spectrum obtained by transmitting the first light according to Example 1 through a filter having the first characteristic, with the maximum value of the spectrum being 1. . That is, the spectrum S13 is the spectrum of light that a teenager corresponding to the first characteristic senses when viewing the first light according to the first embodiment. The spectrum S14 in FIGS. 7A and 7B is the spectrum obtained by transmitting the combined light of the first light and the second light according to Example 1 through a filter having the second characteristic, and the maximum value of the spectrum is standardized as 1. 4 is a modified fourth emission spectrum. In other words, the spectrum S14 is the spectrum of light that a person in their 80s corresponding to the second characteristic perceives when viewing the combined light of the first light and the second light according to the first embodiment.

As shown in FIGS. 7A and 7B, spectrum S13 and spectrum S14 are similarly shaped spectra. In particular, in the first wavelength region R1 of 470 nm or more and 530 nm or less, the difference between the emission intensity in spectrum S13 and the emission intensity in spectrum S14 is within 20% of the emission intensity in spectrum S13 at each wavelength. In addition, in the second wavelength region R2 of 560 nm or more and 580 nm or less, the difference between the emission intensity in the spectrum S13 and the emission intensity in the spectrum S14 is within 20% of the emission intensity in the spectrum S13.

As described above, in the lighting device according to the first embodiment, the spectrum S13 and the spectrum S14 have similar shapes. In other words, the spectrum of light sensed by people in their teens when they see the light composed only of the first light, and the spectrum of light sensed by people in their 80s when they see the combined light of the first light and the second light. are similar. Therefore, the illumination device according to the first embodiment can emit only the first light and emit the combined light of the first light and the second light, thereby making it possible for people in their teens and people in their 80s to The spectrum of the emitted light can be adjusted so that the light colors perceived by the two can be perceived as the same.

In addition, as shown in FIG. 3, the higher the age group, the lower the light transmittance of the human crystalline lens in all visible light wavelength regions. Therefore, the controller increases the light intensity of the second light, which is the adjustment light, as the age of the user increases, and decreases the light intensity of the second light, which is the adjustment light, as the user ages. , the spectral shape of light felt by users of each age group can be made into similar spectra. In other words, the lighting device according to the first embodiment is configured so that even when the user is in an age group other than the teens or the 80s, the light transmittance of the crystalline lens varies depending on the age group, in order to make the perceived lighting environment the same. The amount of light of the first light and the amount of the second light are adjusted according to the level of , and dimming and toning may be performed. Therefore, even if the lighting device according to the first embodiment is used by a person in an age group other than the teens or 80s, it is possible for the users to be similar according to the age group of the user of the lighting space. You can adjust the emitted light to the light that you can feel as a perfect lighting environment.

Next, the spectrum of light emitted by the lighting device according to Comparative Example 2 will be described. FIG. 8A is a diagram showing a spectrum after normalization when light emitted by the lighting device according to Comparative Example 2 is transmitted through a filter. FIG. 8B is an enlarged view of the spectrum of FIG. 8A in the wavelength range from 450 nm to 550 nm. The spectrum S15 in FIGS. 8A and 8B is a third emission spectrum obtained by normalizing the spectrum obtained by transmitting the first light according to Comparative Example 2 through a filter having the first characteristic, with the maximum value of the spectrum being 1. . That is, the spectrum S15 is the spectrum of light that a teenager corresponding to the first characteristic senses when viewing the first light according to the second comparative example. The spectrum S16 in FIGS. 8A and 8B is the spectrum obtained by transmitting the combined light of the first light and the second light according to Comparative Example 2 through a filter having the second characteristic, and the maximum value of the spectrum is standardized as 1. 4 is a modified fourth emission spectrum. That is, the spectrum S16 is the spectrum of light that a person in their 80s corresponding to the second characteristic feels when viewing the combined light of the first light and the second light according to the second comparative example.

As shown in FIGS. 8A and 8B, the spectrum S15 and the spectrum S16 have wavelength ranges in which the spectral shapes match, but the difference in emission intensity is relatively large in some wavelength ranges. In the second wavelength region R2 from 560 nm to 580 nm, the difference between the emission intensity in the spectrum S13 and the emission intensity in the spectrum S14 is within 20% of the emission intensity in the spectrum S13. However, in the first wavelength region R1 from 470 nm to 530 nm, the difference between the emission intensity in the spectrum S13 and the emission intensity in the spectrum S14 exceeds 20% of the emission intensity in the spectrum S13.

As described above, the illumination device according to Comparative Example 2 has a large difference in emission intensity between the spectrum S15 and the spectrum S16 in the first wavelength range R1. That is, the spectrum of light perceived by people in their teens when they see the light composed only of the first light, and the spectrum of light perceived by people in their 80s when they see the combined light of the first light and the second light. has a different shape. Therefore, even if the lighting device according to Comparative Example 2 emits only the first light and emits the combined light of the first light and the second light, the illumination device is suitable for people in their teens and people in their 80s. You can't adjust the light it emits to the light you can perceive as a similar lighting environment.

[Effects, etc.]
As described above, the illumination device 100 according to the present embodiment has the first light emitting section 10 that emits the first light having the first emission spectrum, and the second light having the second emission spectrum and combined with the first light. and a second light emitting unit 20 that emits two lights. Furthermore, the illumination device 100 includes a control section 30 that adjusts the output of each of the first light emitting section 10 and the second light emitting section 20 . Let the light transmission characteristics of the human crystalline lens included in the first age group be the first characteristic, and let the light transmission characteristic of the human crystalline lens included in the second age group higher than the first age group be the second characteristic. . The spectrum of light obtained by assuming that the first light is transmitted through the filter having the first characteristic is defined as the third emission spectrum, and the combined light of the first light and the second light is transmitted through the filter having the second characteristic. A spectrum of light obtained by assuming that the light is transmitted is defined as a fourth emission spectrum. Then, when each of the third emission spectrum and the fourth emission spectrum is normalized by setting the emission intensity at the maximum peak wavelength to 1, the following two conditions are satisfied. (1) In the first wavelength range of 470 nm or more and 530 nm or less, the difference between the emission intensity in the third emission spectrum after normalization and the emission intensity in the fourth emission spectrum after normalization at each wavelength is within 20% of the emission intensity in the third emission spectrum of (2) In the second wavelength range of 560 nm or more and 580 nm or less, the difference between the emission intensity in the third emission spectrum after normalization and the emission intensity in the fourth emission spectrum after normalization at each wavelength is within 20% of the emission intensity in the third emission spectrum of

As a result, the normalized third emission spectrum and the normalized fourth emission spectrum have similar shapes. That is, when irradiated with the first light, a person in the first age group having a crystalline lens with the first characteristic senses light, and when irradiated with the combined light of the first light and the second light, the second characteristic Light sensed by a second-age human with a crystalline lens has a spectrum with a similar shape. Therefore, the lighting device 100 synthesizes the second light as the adjusted light with the first light, performs dimming and toning, so that people in the first age group and people in the second age group feel the same lighting environment. You can adjust the light emitted by the light. Therefore, the lighting device 100 can adjust the emitted light to match the age group of the user of the lighting space, so that the user feels the same lighting environment.

Also, the first age group may be between the ages of 10 and 30, and the second age group may be between the ages of 50 and 80. In addition, 10 to 30 years old means 10 to 40 years old, and 50 to 80 years old means 50 to 90 years old.

This increases the difference in light transmittance between the human crystalline lens of the first age group and the human crystalline lens of the second age group. Therefore, when the light emitted by the lighting device 100 is not adjusted, the difference in the appearance of the lighting environment between the first age group and the second age group becomes significant, and the appearance by adjusting the emitted light becomes noticeable. have a large improvement effect.

(Other embodiments)
Although the illumination device according to the present invention has been described above based on the embodiments, the present invention is not limited to the above embodiments.

For example, in the above embodiment, the first fluorescent member 14 is composed of the red phosphor 12 and the first green phosphor 13, and the second fluorescent member 24 is composed of the second green phosphor 22. It is not limited to this. The first fluorescent member 14 may be composed of a yellow fluorescent material instead of the red fluorescent material 12 and the first green fluorescent material 13 . Moreover, the first fluorescent member 14 and the second fluorescent member 24 may further contain a phosphor that emits light of another peak wavelength.

Moreover, in the above embodiment, the first light emitting element 11 and the second light emitting element 21 are LEDs that emit blue light, but they are not limited to this. For the first light emitting element or the second light emitting element, an LED having an emission peak wavelength shorter than that of blue light may be used, or a plurality of LEDs emitting different wavelengths may be used.

Moreover, although the first light emitting element 11 and the second light emitting element 21 are LEDs in the above embodiment, the present invention is not limited to this. The first light emitting element 11 and the second light emitting element 21 may be light emitting elements that can excite the first fluorescent member 14 and the second fluorescent member 24, respectively. For example, for the first light emitting element 11 and the second light emitting element 21, solid light emitting elements such as inorganic electroluminescence, organic electroluminescence, or semiconductor lasers may be used instead of LEDs.

Moreover, in the above embodiment, the plurality of first light emitting units 10 and the plurality of second light emitting units 20 are mounted on the plurality of substrates 40 of the light emitting module 50, but the present invention is not limited to this. The plurality of first light emitting units 10 and the plurality of second light emitting units 20 may be mounted on separate light emitting modules. Moreover, the illumination device 100 may include a plurality of light emitting modules in which a plurality of first light emitting units 10 and a plurality of second light emitting units 20 are mounted.

In addition, forms obtained by applying various modifications that a person skilled in the art can think of to the above embodiments, or realized by arbitrarily combining the components and functions in the above embodiments without departing from the spirit of the present invention. Also included in the present invention.

10 First Light Emitting Part 11 First Light Emitting Element 12 Red Phosphor 13 First Green Phosphor 14 First Fluorescent Member 20 Second Light Emitting Part 21 Second Light Emitting Element 22 Second Green Phosphor 24 Second Fluorescent Member 30 Control Part 100 lighting equipment

Claims (8)

a first light emitting unit that emits a first light having a first emission spectrum;
a second light emitting unit that has a second emission spectrum and emits a second light that is combined with the first light;
A control unit that adjusts the output of each of the first light emitting unit and the second light emitting unit,
The first characteristic is the light transmission characteristic of the human crystalline lens included in the first age group,
The second characteristic is the light transmission characteristic of the crystalline lens of a human included in a second age group higher in age than the first age group,
A spectrum of light obtained by transmitting the first light through the filter having the first characteristic is defined as a third emission spectrum,
A spectrum of light obtained by transmitting the combined light of the first light and the second light through the filter having the second characteristic is defined as a fourth emission spectrum,
When each of the third emission spectrum and the fourth emission spectrum is normalized with the emission intensity at the maximum peak wavelength as 1,
In the first wavelength range of 470 nm or more and 530 nm or less, the difference between the emission intensity in the third emission spectrum after normalization and the emission intensity in the fourth emission spectrum after normalization at each wavelength is Within 20% of the emission intensity in the third emission spectrum,
In the second wavelength range of 560 nm or more and 580 nm or less, the difference between the emission intensity in the third emission spectrum after normalization and the emission intensity in the fourth emission spectrum after normalization at each wavelength is The illumination device is within 20% of the emission intensity in the third emission spectrum. The first age group is between the ages of 10 and 30,
The lighting device according to claim 1, wherein the second age group is 50s or more and 80s or less. The first age group is teenagers,
The lighting device according to claim 1, wherein the second age group is eighties. The first light emitting unit has a first light emitting element and a first fluorescent member that emits light when excited by light from the first light emitting element,
The second light emitting unit has a second light emitting element and a second fluorescent member that emits light when excited by the light from the second light emitting element,
The lighting device according to any one of claims 1 to 3, wherein the peak wavelength of light emitted from the second fluorescent member is shorter than the peak wavelength of light emitted from the first fluorescent member. the first fluorescent member includes a red phosphor and a first green phosphor,
The lighting device according to claim 4, wherein the second fluorescent member includes a second green phosphor having an emission peak wavelength shorter than that of the first green phosphor. The peak wavelength of the emission of the first green phosphor is 540 nm or more and 570 nm or less,
The lighting device according to claim 5, wherein the peak wavelength of light emitted from the second green phosphor is 510 nm or more and 540 nm or less. The first green phosphor is an yttrium aluminum garnet (YAG) phosphor,
The lighting device according to claim 5 or 6, wherein the second green phosphor is a lutetium aluminum garnet (LuAG) phosphor. The lighting device according to any one of claims 4 to 7, wherein peak wavelengths of light emitted from the first light emitting element and the second light emitting element are respectively 430 nm or more and 470 nm or less.

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