JP2020140813A - Illumination system - Google Patents

Abstract

To provide an illumination system capable of controlling the emission intensity and emission spectrum of illumination light without increasing the size.SOLUTION: An illumination system 1 includes a first light source 10 for irradiation with infrared light 100, a second light source 20 for irradiation with visible light 200, and a structure 50 which is irradiated with the infrared light 100 and the visible light 200 and has translucency. The structure 50 includes a light absorbing material 53 that emits heat upon absorption of infrared light, and a heat responsive material 52 which changes a transmission spectrum of visible light in response to heat.SELECTED DRAWING: Figure 1

Description

The present invention relates to a lighting system.

In recent years, an illumination system or an illumination device capable of controlling the emission spectrum of illumination light has been widely used.

As a lighting device of this type, for example, a lighting device including a light source, a thermochromic film arranged opposite to the light source, a heat generating mechanism for heating the thermochromic film, and a control means for controlling the heat generating mechanism is patented. It is disclosed in 1. Such a lighting device is configured so that the light emitted from the light source becomes the illumination light through the thermochromic film. In such a lighting device, the temperature of the thermochromic film is changed, the transmittance is changed, and the emission spectrum of the illumination light is controlled by controlling the drive of the heater, which is a heat generating mechanism, by using the control means. The emission intensity can be adjusted.

Japanese Unexamined Patent Publication No. 4-162302

However, the above-mentioned conventional lighting device has a problem that the device becomes large in size by providing a heater which is a heat generating mechanism.

Therefore, an object of the present invention is to provide an illumination system capable of controlling the emission spectrum of illumination light without increasing the size.

In order to solve the above problems, one aspect of the lighting system according to the present invention is to irradiate a first light source that irradiates infrared light, a second light source that irradiates visible light, and the infrared light and the visible light. The structure is provided with a light absorbing material that emits heat by absorbing infrared light, and a heat response in which the transmission spectrum of visible light changes in response to the heat. Has sex material.

It is possible to provide an illumination system capable of controlling the emission spectrum of illumination light without increasing the size.

FIG. 1 is a cross-sectional view showing the configuration of the lighting system according to the first embodiment. FIG. 2 is a cross-sectional view showing a configuration of a structure included in the lighting system according to the first embodiment. FIG. 3 is a diagram showing an absorption spectrum of the heat-responsive material according to the first embodiment. FIG. 4 is a diagram showing an absorption spectrum of the light absorbing material according to the first embodiment. FIG. 5 is a diagram showing an emission spectrum of the first light source according to the first embodiment. FIG. 6A is a diagram showing transmission spectra of the structure according to the first embodiment and the structure of the comparative example before infrared light irradiation. FIG. 6B is a diagram showing transmission spectra of the structure according to the first embodiment and the structure of the comparative example after infrared light irradiation. FIG. 7 is a diagram showing emission spectra of visible light and illumination light according to the first embodiment. FIG. 8 is a schematic view showing an example of the lighting system according to the first embodiment. FIG. 9 is a schematic view showing the configuration of the lighting system according to the second embodiment. FIG. 10 is a schematic view showing the configuration of the lighting system according to the third embodiment.

Hereinafter, embodiments of the present invention will be described. It should be noted that all of the embodiments described below show a specific example of the present invention. Therefore, the numerical values, the components, the arrangement positions of the components, the connection form, and the like shown in the following embodiments are examples and are not intended to limit the present invention. Therefore, among the components in the following embodiments, the components not described in the independent claims indicating the highest level concept of the present invention will be described as arbitrary components.

Further, each figure is a schematic view and is not necessarily exactly illustrated. In each figure, substantially the same configuration is designated by the same reference numerals, and duplicate description will be omitted or simplified.

(Embodiment 1)
The configuration of the lighting system 1 according to the embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a cross-sectional view showing the configuration of the lighting system 1 according to the present embodiment. FIG. 2 is a cross-sectional view showing the configuration of the structure 50 included in the lighting system 1 according to the present embodiment.

As shown in FIG. 1, the lighting system 1 is irradiated with a first light source 10 that irradiates infrared light 100, a second light source 20 that irradiates visible light 200, infrared light 100, and visible light 200, and is transparent. It includes a structure 50 having light property. The lighting system 1 is a lighting fixture that illuminates the surroundings with visible light 200 emitted by the second light source 20.

The lighting system 1 further includes a housing 60 that houses a first light source 10 and a second light source 20. In the present embodiment, since the first light source 10 and the second light source 20 are housed in one housing 60, it can be said that the lighting system 1 is one lighting fixture. Further, a solid light source can be used as the first light source 10 and the second light source 20. Further, as the solid-state light source, a semiconductor laser light source or an LED light source can be used.

The first light source 10 includes a first container 11 having a recess, a first light emitting element 12 mounted in the recess, a first sealing member 13 sealed in the recess, and a first light emitting element 12 from the outside. A pair of first lead pins 14 for inputting electric power to the device are provided.

The first container 11 is a container that houses the first light emitting element 12 and the first sealing member 13. Further, the first container 11 includes a first electrode (not shown) which is a metal wiring for supplying electric power to the first light emitting element 12. The first light emitting element 12 and the first electrode are electrically connected by a first bonding wire (not shown). The material of the first container 11 is, for example, metal, ceramic or resin.

The first light emitting element 12 is an example of an element that emits infrared light, and in the present embodiment, is an infrared light LED (Light Emitting Diode) chip that emits infrared light. Here, the infrared light is light having a wavelength of 780 nm to 1000 μm. The first light emitting element 12 is, for example, an LED chip made of a GaAs-based (gallium arsenide) material and having a center wavelength (emission peak wavelength of the emission spectrum) of 830 nm or more and 860 nm or less.

Further, the first light source 10 is not limited to the infrared light LED light source, and a laser light source that emits infrared light may be used.

The first sealing member 13 is a member that seals the first light emitting element 12. Further, the first sealing member 13 further seals the first bonding wire and the first electrode. As the first sealing member 13, a resin having translucency with respect to light in the infrared region can be used. Specifically, the first sealing member 13 is, but is not limited to, an epoxy resin or the like.

Further, one end of the pair of first lead pins 14 is electrically connected to the first light emitting element 12 via the first bonding wire and the first electrode. The pair of first lead pins 14 are input terminals that receive an input of electric power as input energy, and the other end of the pair of first lead pins 14 is connected to a power supply source (not shown) such as a power supply circuit.

The second light source 20 includes a second container 21 having a recess, a second light emitting element 22 mounted in the recess, a second sealing member 23 sealed in the recess, and a second light emitting element 22 from the outside. A pair of second lead pins 24 for inputting electric power to the device are provided.

The second container 21 is a container that houses the second light emitting element 22 and the second sealing member 23. Further, the second container 21 includes a second electrode (not shown) which is a metal wiring for supplying electric power to the second light emitting element 22. The second light emitting element 22 and the second electrode are electrically connected by a second bonding wire (not shown). The material of the second container 21 is, for example, metal, ceramic or resin.

The second light emitting element 22 is an example of an element that emits visible light, and in the present embodiment, is a blue light LED chip that emits blue light. The second light emitting element 22 is, for example, an LED chip made of a GaInN-based (gallium nitride indium) material and having a center wavelength (emission peak wavelength of the emission spectrum) of 430 nm or more and 460 nm or less.

Further, the second light source 20 is not limited to the blue light LED light source, and a laser light source that emits blue light may be used.

The second sealing member 23 is a member that seals the second light emitting element 22. In addition, the second sealing member 23 further seals the second bonding wire and the second electrode. The second sealing member 23 contains yellow phosphor particles as a wavelength conversion material that converts the wavelength of the light emitted by the second light emitting element 22. As the second sealing member 23, a resin having translucency with respect to light in the visible region can be used. Specifically, the second sealing member 23 is, but is not limited to, an epoxy resin, a urea-based resin, or the like.

With this configuration, a part of the blue light emitted by the second light emitting element 22 is wavelength-converted to yellow light by the yellow phosphor particles contained in the second sealing member 23. Then, the blue light that is not absorbed by the yellow phosphor particles and the yellow light that has been wavelength-converted by the yellow phosphor particles are diffused and mixed in the second sealing member 23. As a result, white light is emitted as diffused light from the second sealing member 23.

Further, one end of the pair of second lead pins 24 is electrically connected to the second light emitting element 22 via the second bonding wire and the second electrode. The pair of second lead pins 24 are input terminals that receive an input of electric power as input energy, and the other end of the pair of second lead pins 24 is connected to a power supply source (not shown) such as a power supply circuit.

By using a solid light source as the first light source 10 and the second light source 20, the lighting system 1 is provided with a highly durable light source. Further, by using a semiconductor laser light source or an LED light source as the solid-state light source, the lighting system 1 emits light with low power consumption.

The housing 60 is a case made of resin or metal. The internal space of the housing 60 is a closed space that accommodates the first light source 10 and the second light source 20. Therefore, the first light source 10 and the second light source 20 are protected by the housing 60. The infrared light 100 emitted by the first light source 10 and the visible light 200 emitted by the second light source 20 are emitted from the housing 60 to the external space via the structure 50. Further, as shown in FIG. 1, the light emitted into the external space is the light emitted by the illumination system 1, and is the illumination light 300.

Subsequently, the structure 50 will be described.

As shown in FIG. 2, the translucent structure 50 has a light absorbing material 53 that emits heat by absorbing infrared light and a thermal response in which the transmission spectrum of visible light changes in response to heat. It is a member having a sex material 52. For example, the structure 50 has translucency with respect to light in the visible and infrared regions. Further, the structure 50 further has a resin composition 51, and the resin composition 51 disperses and holds the light absorbing material 53 and the heat responsive material 52.

First, the resin composition 51 will be described.

The resin composition 51 is a resin material that disperses and holds the light absorbing material 53 and the heat responsive material 52. Further, the resin composition 51 is a matrix resin containing a light absorbing material 53 and a heat responsive material 52, and is preferably translucent with respect to light in the visible and infrared regions. The resin composition 51 is selected from, for example, at least selected from the group consisting of acrylic resins, polycarbonate resins, cycloolefin resins, epoxy resins, silicone resins, acrylic-styrene copolymers, styrene resins and urethane resins. It is preferable to contain one. By using such a resin composition 51, the structure 50 can easily have translucency.

In the present embodiment, the resin composition 51 uses polymethyl methacrylate and methyl methacrylate, which are examples of acrylic resins.

Further, the structure 50 according to the present embodiment may include a curing agent that cures the resin composition 51. The curing agent is selected by the method of curing the resin composition 51. The method for curing the resin composition 51 is not particularly limited, and it may be cured by heating, or it may be cured by active energy rays (electromagnetic waves, ultraviolet light, visible light, infrared light, electron beam, γ ray, etc.). Good. When the resin composition 51 is cured by the active energy rays, a photopolymerization initiator or the like is used. As the photopolymerization initiator, known photopolymerization initiators such as radical photopolymerization initiators, cationic photopolymerization initiators, and anionic photopolymerization initiators can be used.

When the resin composition 51 is cured by heating, a thermal polymerization initiator or the like is used. As the thermal polymerization initiator, an organic peroxide, an azo compound, a redox-based initiator and the like can be used.

Specifically, for example, the curing agent is t-butylperoxy-2-ethyl acetate, t-butylperoxy-2-ethylhexanoate, t-amylperoxy-2-ethylhexanoate, t-. It is an organic peroxide such as hexylperoxy-2-ethylhexanoate and 1,1,3,3-tetramethylbutylperoxy-2-ethylhexanoate. The curing agent is an azo compound such as 2,2'azobisisobutyronitrile or 2,2'azobis (2,4-dimethylvaleronitrile), an organic peroxide, and reduction of amines, mercaptans, etc. A known redox-based initiator containing a sex compound as a main component may be used. Further, the curing agent may be benzoin, benzoin ethers, 1-hydrohexylphenyl ketone, benzyl dimethyl ketal, acylphosphenoxide, benzophenone, Michler ketone, thioxanthones and the like. In this embodiment, t-butylperoxybenzoate was used as the curing agent.

Further, the light absorbing material 53 dispersed in the resin composition will be described.

The light absorbing material 53 is a material that generates heat by absorbing infrared light. That is, the light absorbing material 53 is a material that heats the surroundings by absorbing infrared light. The light absorbing material 53 has a property that vibration becomes intense and heat is generated by absorbing infrared light having energy corresponding to a frequency such as molecular motion. The light absorbing material 53 includes near-infrared light (0.78 μm to 2.5 μm), mid-infrared light (2.5 μm to 6 μm), and far-infrared light (6 μm to 1000 μm) among infrared light. It suffices if at least one of them can be absorbed. Further, the light absorbing material 53 may be a material that generates heat by absorbing other light in addition to infrared light. The other light is, for example, ultraviolet light or visible light.

The light absorbing material 53 is a material containing at least one of an inorganic material and an organic material. For example, as the organic material, phthalocyanine compounds, azo compounds, cyanine compounds, diimonium compounds, squarylium compounds and the like can be used.

In the present embodiment, as the light absorbing material 53, copper phthalocyanine, which is an example of a phthalocyanine compound, was used.

With such a configuration, the light absorbing material 53 absorbs infrared light and generates heat, so that the lighting system 1 does not need to be provided with a heat source such as a heater. That is, the lighting system 1 does not need to be increased in size because it can generate heat even if it is not provided with a heater.

Next, the heat-responsive material 52 that utilizes the heat generated by the light absorbing material 53 will be described.

The heat-responsive material 52 is a material whose transmission spectrum of visible light changes in response to heat. That is, the heat-responsive material 52 is a material in which the transmission spectrum of visible light changes when heat is transferred to and from surrounding substances and the temperature exceeds a threshold value. In the present embodiment, the heat responsive material 52 changes the transmission spectrum of visible light due to the heat generated by the light absorbing material 53.

The change in the transmission spectrum of visible light may be caused by a change in the light absorption wavelength or the haze value (haze) of the heat-responsive material 52, but is not limited thereto. Further, the change in the transmission spectrum of visible light may be a change in the transmittance that fluctuates in the entire wavelength region or a constant wavelength region of the visible light region (380 nm to 780 nm). The change in the transmission spectrum of visible light may be a change in the transmittance that fluctuates while maintaining the spectral shape in the entire wavelength region of the visible light region. Further, the change in the transmission spectrum of visible light may be a change in which the transmittance increases in a certain wavelength region and decreases in other wavelength regions. Further, when the change in the transmission spectrum of visible light changes the transmittance in a certain wavelength region of the visible light region, the spectral shape changes.

As the heat-responsive material 52 according to the present embodiment, a material whose transmission spectrum of visible light changes due to a change in the light absorption wavelength when the temperature exceeds a threshold value, that is, a temperature indicating material is used.

Further, the temperature indicating material according to the present embodiment includes an electron-donating color-developing organic compound, an electron-accepting compound, and an organic compound medium.

The electron-donating color-forming organic compound is a material that changes the color to be exhibited by changing the light absorption wavelength by exchanging electrons with the electron-accepting compound. That is, the electron-donating color-developing organic compound is a color-developing component. For example, the color exhibited by an electron-donating color-forming organic compound changes from colored to colorless or colorless to colored depending on the transfer of electrons. Also, the transfer of electrons occurs in response to heat.

The electron-donating color-developing organic compound is not particularly limited, and a known electron-donating color-forming organic compound can be arbitrarily used.

The electron-donating color-developing organic compounds include, for example, fluorin-based compounds, phenothiazine-based compounds, spiropyran-based compounds, leukooramine-based compounds, rhodamine lactam-based compounds, polyarylcarbinol-based compounds, diphenylmethanephthalide-based compounds, and triphenyl. Methanphthalide compounds, phenylindrylphthalide compounds, indolylphthalide compounds, diphenylmethane azaphthalide compounds, phenylindrill azaphthalide compounds, styrylquinolin compounds, pyridine compounds, quinazoline compounds, Bisquinazoline-based compounds, ethirenophthalide-based compounds, ethirenoazaphthalide-based compounds and fluorene-based compounds can be used.

The electron-accepting compound acts on the electron-donating color-forming organic compound to change the color exhibited by the electron-donating color-forming organic compound. The electron-accepting compound is a compound having an active proton, a pseudo-acidic compound or a compound having electron vacancies.

The electron accepting compound is not particularly limited. The electron-accepting compound is, for example, a compound having a phenolic hydroxyl group (for example, phenol, o-cresol, m-octylphenol, n-dodecylphenol and n-stearylphenol). Further, the electron-accepting compound may be carboxylic acids and metal salts thereof (for example, zinc salicylate, zinc 3,5-di (α-methylbenzyl) salicylate). Further, the electron-accepting compound may be an acidic phosphate ester and a metal salt thereof, and the electron-accepting compound is a urea / thiourea compound, 1,2,3-triazole and a derivative thereof. You may.

In addition, the organic compound medium reversibly proceeds with the color reaction by the electron-donating color-developing organic compound and the electron-accepting compound.

The organic compound medium is, for example, an alcohol compound, an ester compound, a ketone compound or an ether compound.

As described above, in the present embodiment, the temperature-indicating material is used as the heat-responsive material 52, and the temperature-indicating material includes an electron-donating color-forming organic compound, an electron-accepting compound, and an organic compound medium. including. With this configuration, an easily available organic material-based heat-responsive material 52 can be used.

In addition, the temperature indicating material is encapsulated in microcapsules. As a method for microencapsulating the temperature indicating material, a known method can be used. For example, the methods for microencapsulation are interfacial polymerization method, interfacial polycondensation method, in-Situ polymerization method, in-liquid curing coating method, phase separation method from aqueous solution, phase separation method from organic solvent, melting dispersion cooling method, and air. There are a medium suspension coating method, a spray drying method, etc., which are appropriately selected according to the application.

The average particle size of the microcapsules is 0.5 μm to 50 μm, preferably 3 μm to 30 μm, which is effective because it has excellent discoloration sensitivity.

Further, by encapsulating the temperature indicating material in the microcapsules, the constituent materials of the temperature indicating material, which is the temperature indicating material, come close to each other, and reversibility can be imparted.

As described above, the heat-responsive material 52 according to the present embodiment is a temperature-indicating material contained in the microcapsules. Specifically, the heat-responsive material 52 according to the present embodiment is Sakura TC Color TC-PN45 (hereinafter referred to as Sakura TC Color) manufactured by Sakura Color Products Corporation, which is a temperature indicating material.

The Sakura TC color exhibits a blue color under low temperature (for example, 25 ° C. at room temperature) conditions. However, when the Sakura TC color is heated and subjected to high temperature (for example, a threshold value of 29 ° C. or higher), the light absorption wavelength changes and becomes colorless. Subsequently, the Sakura TC color is cooled, and when the temperature is low again, the light absorption wavelength changes and the color is colored blue. As described above, the Sakura TC color is a material that reversibly changes the color to be exhibited by changing the light absorption wavelength by exchanging heat with surrounding substances.

Further, when the light absorption wavelength of the Sakura TC color changes, the visible light transmission spectrum also changes at the same time.

To summarize the above, the color and visible light transmission spectrum of the Sakura TC color change with the change in the light absorption wavelength with the change in temperature.

Further, in the present embodiment, since the structure 50 includes the heat-responsive material 52, the color exhibited by the structure 50 is the same as the color exhibited by the heat-responsive material 52.

Further, as shown in FIG. 1, the structure 50 is attached to an opening provided in the housing 60. The structure 50 is attached to the housing 60 by, for example, a holder (not shown).

Further, the shape of the structure 50 may be any shape as long as it is irradiated with infrared light 100 and visible light 200. For example, the structure 50 may have a plate-like shape such as a flat plate or a disk, and the surface irradiated with the infrared light 100 and the visible light 200 may be a flat surface or a curved surface, and has protrusions and the like. May be good.

In the present embodiment, the infrared light 100 and the visible light 200 irradiate the entire region of the irradiation surface of the structure 50, but the present invention is not limited to this. The infrared light 100 and the visible light 200 may irradiate only a specific region of the irradiation surface of the structure 50.

Here, a method for manufacturing the structure 50 according to the present embodiment will be described. The method for manufacturing the structure 50 according to the present embodiment is not particularly limited as long as it can form a member having the light absorbing material 53 and the heat responsive material 52.

Specifically, a resin mixture in which the above-mentioned resin composition 51, heat-responsive material 52, light absorbing material 53, and a curing agent for curing the resin composition 51 are mixed is prepared, and the obtained resin mixture has a predetermined shape. The structure 50 can be manufactured by casting it into a mold and curing it.

The curing of the resin mixture can be performed by heating the mold at a temperature of, for example, 50 ° C. to 110 ° C. for 30 minutes to 150 minutes. The heating method at the time of curing molding is not particularly limited, but a known method, for example, a method of heating with a heat source such as hot air, hot water, or an infrared light heater can be used.

The structure 50 according to the present embodiment was manufactured as follows.

First, 30 parts by mass of polymethyl methacrylate and 70 parts by mass of methyl methacrylate were mixed as the resin composition 51 to obtain an acrylic resin mixed solution. Further, in the obtained acrylic resin mixture, 0.5 parts by mass of t-butylperoxybenzoate as a curing agent, 3 parts by mass of Sakura TC color as a heat-responsive material 52, and copper phthalocyanine as a light absorbing material 53. 1 part by mass was mixed to obtain a resin mixture.

Next, the obtained resin mixture is cast into a mold under room temperature (25 ° C.) conditions, and the mold is heated at 105 ° C. for 60 minutes and cured to cure the structure according to the present embodiment. I got 50.

Moreover, for examination, the structure of the comparative example was manufactured as follows.

The structure of the comparative example was produced by using the same material and the same method as the structure 50 according to the present embodiment, except that the copper phthalocyanine which is the light absorbing material 53 is not contained.

As described above, the structure 50 according to the present embodiment has the resin composition 51 in which the light absorbing material 53 and the heat responsive material 52 are dispersed. With this configuration, heat is easily transferred from the light absorbing material 53 to the heat responsive material 52, and the visible light transmission spectrum of the light absorbing material 53 is likely to change.

Further, the ratio of the mass of the heat responsive material 52 and the light absorbing material 53 to the total mass of the structure 50 is, for example, 0.1% by mass to 30% by mass and 0.01% by mass to 5% by mass. Is preferable. Further, the mass ratio of the heat responsive material 52 and the light absorbing material 53 is more preferably 0.5% by mass to 10% by mass and 0.03% by mass to 3% by mass, and 1% by mass to 5% by mass. % And 0.05% by mass to 1.5% by mass, more preferably.

With such a range, the heat-responsive material 52 and the light-absorbing material 53 can be arranged closer to each other in the structure 50, and the visible light transmission spectrum of the light-absorbing material 53 due to heat transfer can be obtained. It is easier to make changes.

With the above configuration, the light absorbing material 53 absorbs the infrared light 100 and generates heat in the region where the infrared light 100 is irradiated on the irradiation surface of the structure 50. The heat generated by the light absorbing material 53 heats the heat responsive material 52 existing around the light absorbing material 53. As a result, the temperature of the heat-responsive material 52 exceeds the threshold temperature, and the transmission spectrum of visible light of the heat-responsive material 52 changes.

As described above, the visible light 200 becomes light corresponding to the transmission spectrum of the visible light and becomes a part of the illumination light 300. Therefore, the emission spectrum of the illumination light 300 changes with the irradiation of the infrared light 100.

In this embodiment, Sakura TC color was used as the heat responsive material 52. This material exhibits a blue color under low temperature conditions, that is, before irradiation with infrared light 100, and becomes colorless under high temperature conditions, that is, after irradiation with infrared light 100, due to a change in light absorption wavelength. Further, the irradiation of the infrared light 100 changes the light absorption wavelength of the Sakura TC color, and at the same time, the visible light transmission spectrum changes.

That is, the light absorption wavelength of the Sakura TC color changes with the irradiation of the infrared light 100, which is a factor of heat generation, and as a result, the exhibited color and the visible light transmission spectrum change. Further, the structure 50 having the Sakura TC color, which is the heat-responsive material 52, similarly changes the color and the visible light transmission spectrum. Further, as described above, the visible light 200 passes through the structure 50 and becomes light corresponding to the change in the visible light transmission spectrum of the structure 50 and becomes a part of the illumination light 300.

Summarizing the above, in the present embodiment, since the visible light transmission spectrum of the structure 50 changes due to the heat generated by the irradiation of the infrared light 100, the light emitted to the outside of the housing 60, that is, the illumination light 300 The emission spectrum of is changed. Therefore, since the lighting system 1 can generate heat even if it does not have a heat source such as a heater, it is possible to control the emission spectrum of the illumination light 300 without increasing the size.

Further, the color of the structure 50 according to the present embodiment changes due to heat generated by irradiation with infrared light 100. Therefore, since the appearance of the lighting system 1 changes, the lighting system 1 has a high design.

[Optical characteristics of components]
Subsequently, the optical characteristics of the components according to the present embodiment will be described in detail with reference to FIGS. 3 to 7 showing the experimental results.

FIG. 3 is a diagram showing an absorption spectrum of the heat-responsive material 52 according to the present embodiment. Specifically, FIG. 3 shows an absorption spectrum of Sakura TC color, which is an example of a temperature indicating material, at a low temperature.

As shown in FIG. 3, the temperature indicating material according to the present embodiment absorbs light mainly at a wavelength of 400 nm and a wavelength of 600 nm under low temperature conditions and exhibits a blue color. Further, although not shown, under high temperature conditions, the temperature indicating material according to the present embodiment loses light absorption centered on a wavelength of 400 nm and a wavelength of 600 nm and becomes colorless. That is, the light absorption wavelength of the temperature indicating material according to the present embodiment changes depending on the temperature.

FIG. 4 is a diagram showing an absorption spectrum of the light absorbing material 53 according to the present embodiment. Specifically, it is an absorption spectrum of copper phthalocyanine, which is an example of a phthalocyanine compound. As shown in FIG. 4, copper phthalocyanine absorbs light mainly at a wavelength of 805 nm. That is, copper phthalocyanine is a material that absorbs near-infrared light.

FIG. 5 is a diagram showing an emission spectrum of the first light source 10 according to the present embodiment. More specifically, it is an emission spectrum of infrared light 100 irradiated by the first light source 10 according to the present embodiment. The emission peak wavelength of the infrared light 100 according to the present embodiment is 845 nm, which is light including near infrared light.

Further, this emission peak wavelength overlaps with the absorption wavelength of copper phthalocyanine. Therefore, the copper phthalocyanine can efficiently absorb the infrared light 100, and as a result, can efficiently generate heat.

Further, the light behavior before and after irradiation of the infrared light 100 in the structure 50 according to the present embodiment will be described.

FIG. 6A is a diagram showing transmission spectra of the structure 50 and the structure of the comparative example according to the present embodiment before irradiation with infrared light 100. Further, FIG. 6B is a diagram showing transmission spectra of the structure 50 and the structure of the comparative example according to the present embodiment after irradiation with infrared light 100. More specifically, FIGS. 6A and 6B show changes in the transmission spectrum of the region irradiated by the infrared light 100 in the structure 50 and the structure of the comparative example according to the present embodiment.

First, focus on the structure 50 (solid line) according to the present embodiment.

Compared with the transmission spectrum before infrared light 100 irradiation shown in FIG. 6A, in the transmission spectrum after infrared light 100 irradiation shown in FIG. 6B, the transmittance in the wavelength region of 400 nm to 730 nm is increased, and the spectrum shape is further increased. You can see that it is changing. This change in transmission spectrum can be explained as follows.

As described above, in the region irradiated with the infrared light 100, the copper phthalocyanine, which is the light absorbing material 53, absorbs the infrared light 100 and generates heat. As a result, the light absorption wavelength of the Sakura TC color changes, so that the Sakura TC color disappears from blue and becomes colorless. Moreover, when the light absorption wavelength of the Sakura TC color changes, the transmission spectrum also changes at the same time. That is, the irradiation of the infrared light 100 changes the light absorption wavelength of the Sakura TC color, and as a result, the color to be exhibited and the visible light transmission spectrum change. Further, the structure 50 according to the present embodiment having the Sakura TC color similarly changes the color and the visible light transmission spectrum.

That is, the change in the transmittance of the structure 50 according to the present embodiment shown in FIGS. 6A and 6B (increased transmittance in a specific wavelength region and change in spectral shape) is the Sakura TC color which is the heat-responsive material 52. Due to the change in the light absorption wavelength of.

On the other hand, in the structure (dotted line) of the comparative example, there is a change between the transmission spectrum before irradiation with infrared light 100 shown in FIG. 6A and the transmission spectrum after irradiation with infrared light 100 shown in FIG. 6B. Absent.

The structure of the comparative example has the Sakura TC color which is the heat responsive material 52, but does not have the copper phthalocyanine which is the light absorbing material 53, so that heat is not generated even when the infrared light 100 is irradiated. Therefore, the light absorption wavelength of the heat-responsive material 52 does not change, and as a result, in the structure of the comparative example, the transmission spectrum does not change even when the infrared light 100 is irradiated.

As described above, since the structure 50 according to the present embodiment includes the light absorbing material 53, it can generate heat more efficiently and change the transmission spectrum of visible light of the heat responsive material 52.

Next, the light emitted by the lighting system 1, that is, the illumination light 300 will be described.

FIG. 7 is a diagram showing emission spectra of visible light 200 and illumination light 300 according to the present embodiment.

The alternate long and short dash line in FIG. 7 shows the emission spectrum of visible light 200 emitted from the second light source 20 and before reaching the structure 50. The second light source 20 according to the present embodiment is visible light 200 which is a composite light of blue light (peak wavelength 445 nm) produced by the second light emitting element 22 and yellow light (peak wavelength 550 nm) according to the yellow phosphor particles. When emitted, the visible light 200 exhibits a white color.

The visible light 200 and the infrared light 100 shown in FIG. 1 are emitted to the external space via the structure 50 to become the illumination light 300.

The solid line in FIG. 7 shows the emission spectrum of the illumination light 300 before irradiation with the infrared light 100, and the dotted line in FIG. 7 shows the emission spectrum of the illumination light 300 after irradiation with the infrared light 100. The emission spectrum (solid line) of the illumination light 300 before irradiation with the infrared light 100 includes wavelengths in the visible region, and it can be seen that the illumination light 300 at this time is light based on the visible light 200. Further, the emission spectrum of the illumination light 300 after irradiation with the infrared light 100 includes wavelengths in the visible region and the near infrared region, and the illumination light 300 at this time is light based on the visible light 200 and the infrared light 100. It can be seen that it is.

Further, the emission spectrum after irradiation with 100 infrared light has an increased emission intensity in the wavelength region of 400 nm to 730 nm as compared with the emission spectrum before irradiation with 100 infrared light. Further, the emission spectrum shape is changed by the irradiation of the infrared light 100, which indicates that the emission color of the illumination light 300 is changed. As shown in FIGS. 6A and 6B, in the structure 50 according to the present embodiment, the transmission spectrum is changed by irradiation with infrared light 100 (increased transmittance in a specific wavelength region and change in spectrum shape). Is thought to have happened.

That is, in the present embodiment, the transmission spectrum of the structure 50 changes due to the heat generated by the irradiation of the infrared light 100, so that the emission spectrum of the illumination light 300 changes. Specifically, the illumination light 300 increases the emission intensity and changes the emission spectrum shape.

Here, other configurations of the lighting system 1 according to the present embodiment are shown.

The lighting system 1 according to the present embodiment may be any lighting fixture, and for example, a ceiling light, a downlight, a bracket light, a pendant light, a floor stand, a foot light, or the like can be used. it can. Further, the lighting system 1 is an instrument attached to a mounting surface such as a ceiling surface, a floor surface, and a wall surface of a space.

FIG. 8 is a schematic view showing an example of the lighting system 1 according to the present embodiment. The lighting system 1 according to the present embodiment is, for example, a ceiling light attached to a ceiling surface in a room. In this case, the shade portion, which is the cover portion of the ceiling light, can be configured to include the structure 50.

Further, in the present embodiment, the first light source 10 and the second light source 20 each exist one by one, but the present invention is not limited to this. A plurality of the first light source 10 and the second light source 20 may exist.

Further, the infrared light 100 may irradiate only a specific region, not the entire region of the irradiation surface of the structure 50. In this case, the irradiation of the infrared light 100 can change the color exhibited only in the specific region of the structure 50, and further change the transmission spectrum. That is, the appearance of the lighting system 1 can be controlled by controlling the irradiation region of the infrared light 100. The design of such a lighting system 1 is further enhanced.

The heat-responsive material 52 may change the transmission spectrum of visible light depending on the temperature. For example, the heat responsive material 52 is colored under low temperature conditions and colorless under high temperature conditions, whereas the heat responsive material 52 is colored and colorless under medium temperature conditions between low temperature and high temperature. It may exhibit a color between and. Thereby, by controlling the heat generated by the light absorbing material 53, the color exhibited by the structure 50 including the heat responsive material 52 can be controlled more precisely.

Further, in the present embodiment, the heat-responsive material 52 changes the transmission spectrum of visible light due to the heat generated by the light absorbing material 53, but the present invention is not limited to this. For example, the heat-responsive material 52 itself may change the transmission spectrum of visible light by absorbing light and generating heat.

Further, the change in the transmission spectrum of the heat-responsive material 52 may be caused by a phenomenon in which the haze changes in response to heat. That is, the heat-responsive material 52 may be a material that causes light scattering. For example, the heat responsive material 52 is PNIPAM (poly-N-isopropylacrylamide, poly-N-isotropylacrylamide). PNIPAM is a highly translucent material that is hydrated at low temperatures, but when it exceeds a threshold temperature, it releases hydrated molecules and contracts to form a small spherical structure. The heat-responsive material 52 becomes a material that causes light scattering due to this change in structure.

As shown in FIG. 1, in the present embodiment, the first light source 10 and the second light source 20 irradiate the structure 50 with infrared light 100 and visible light 200 from the same direction. , Not limited to this. The first light source 10 may be arranged on the opposite side of the second light source 20 with the structure 50 interposed therebetween. For example, the second light source 20 may be arranged inside the housing 60, and the first light source 10 may be arranged outside the housing 60.

Further, the structure 50 may further have a dye or a pigment. With such a configuration, the color variation exhibited by the structure 50 can be increased. In addition, it becomes easy to control the wavelength of the illumination light 300.

[Effects, etc.]
As described above, in the lighting system 1 according to the present embodiment, the first light source 10 that irradiates the infrared light 100, the second light source 20 that irradiates the visible light 200, and the infrared light 100 and the visible light 200 are included. It includes a structure 50 that is irradiated and has translucency. The structure 50 includes a light absorbing material 53 that emits heat by absorbing infrared light, and a heat responsive material 52 whose transmission spectrum of visible light changes in response to heat.

As a result, the light absorption wavelength of the heat-responsive material 52 contained in the structure 50 changes due to the heat generated by the light-absorbing material 53 due to the irradiation of the infrared light 100, and the visible light transmission spectrum of the heat-responsive material 52 changes. To do. As a result, the transmission spectrum of the structure 50 changes, so that the emission spectrum of the illumination light 300 changes. More specifically, the illumination light 300 according to the present embodiment has increased emission intensity and changes the emission spectrum shape.

Therefore, since the lighting system 1 can generate heat even if it does not have a heat source such as a heater, it is possible to control the emission spectrum of the illumination light 300 without increasing the size.

Further, due to the heat generated by the light absorbing material 53 due to the irradiation of the infrared light 100, the light absorbing wavelength of the heat responsive material 52 contained in the structure 50 changes, and the color exhibited by the heat responsive material 52 changes. As a result, the color exhibited by the structure 50 changes. Therefore, since the appearance of the lighting system 1 changes, the lighting system 1 has a high design.

Further, in the lighting system 1 according to the present embodiment, the structure 50 further has a resin composition 51, and the resin composition 51 disperses and holds the light absorbing material 53 and the heat responsive material 52. ..

As a result, heat is easily transferred from the light absorbing material 53 to the heat responsive material 52, and the visible light transmission spectrum of the light absorbing material 53 is likely to change.

Further, in the lighting system 1 according to the present embodiment, the heat responsive material 52 is a temperature indicating material. Further, in the lighting system 1 according to the present embodiment, the temperature indicating material includes an electron-donating color-developing organic compound, an electron-accepting compound, and an organic compound medium. The organic compound medium reversibly proceeds the color reaction by the electron-donating color-developing organic compound and the electron-accepting compound.

This makes it possible to use an easily available organic material-based heat-responsive material 52.

Further, in the lighting system 1 according to the present embodiment, the temperature indicating material is encapsulated in microcapsules.

As a result, the constituent materials of the temperature indicating material come close to each other, and reversibility can be imparted.

Further, in the lighting system 1 according to the present embodiment, the structure 50 further has a dye or a pigment.

As a result, the color variation exhibited by the structure 50 can be increased. In addition, it becomes easy to control the wavelength of the illumination light 300.

Further, in the lighting system 1 according to the present embodiment, the first light source 10 and the second light source 20 are solid light sources.

As a result, the lighting system 1 is provided with a highly durable light source.

Further, in the lighting system 1 according to the present embodiment, the solid-state light source is a semiconductor laser light source or an LED light source.

As a result, the lighting system 1 emits light with low power consumption.

(Embodiment 2)
In the first embodiment, a configuration in which the first light source 10 and the second light source 20 are housed in one housing 60, that is, a structure in which the first light source 10 and the second light source 20 are housed in one luminaire is shown. However, it is not limited to this configuration. The second embodiment is different from the first embodiment in that the first light source and the second light source are separately housed in different lighting fixtures. In the second embodiment, detailed description of the components common to the first embodiment will be omitted.

[Constitution]
FIG. 9 is a schematic view showing the configuration of the lighting system 1a according to the present embodiment.

The lighting system 1a according to the present embodiment includes a first luminaire 1000 including a first light source that irradiates infrared light, and a second luminaire 2000 that includes a second light source and a structure that irradiates visible light. .. Further, in the present embodiment, the visible light emitted from the second luminaire 2000 is the illuminating light 300a that illuminates the surroundings.

Further, the first luminaire 1000 and the second luminaire 2000 are arranged so that the infrared light emitted by the first luminaire 1000 reaches the structure included in the second luminaire 2000. The first luminaire 1000 and the second luminaire 2000 may be any luminaire. For example, in the first luminaire 1000 and the second luminaire 2000, ceiling lights, downlights, bracket lights, pendant lights, floor stands, foot lights and the like can be used. Further, the first luminaire 1000 and the second luminaire 2000 are fixtures that are attached to mounting surfaces such as a ceiling surface, a floor surface, and a wall surface of a space.

The first luminaire 1000 according to the present embodiment is a spotlight attached to a wall surface, and the second luminaire 2000 according to the present embodiment is a ceiling light attached to a ceiling.

Further, the structure according to the present embodiment is produced by using the same resin mixture and manufacturing method as the structure 50 according to the first embodiment, and is included in the shade portion which is the cover portion of the first luminaire 1000. ing.

Therefore, also in the present embodiment, the visible light transmission spectrum of the structure changes due to the heat generated by the irradiation of infrared light, so that the emission spectrum of the illumination light 300a changes. Further, the color of the structure according to the present embodiment changes due to heat generated by irradiation with infrared light. Therefore, since the appearance of the lighting system 1a changes, the lighting system 1a has a high design.

Further, the lighting system 1a according to the present embodiment includes a first luminaire 1000 including a first light source that irradiates infrared light, and a second luminaire 2000 that includes a second light source and a structure that irradiates visible light. To be equipped. Therefore, the first luminaire 1000 and the second luminaire 2000 can be installed so as to be separated from each other, which increases the degree of freedom in design.

Further, the lighting system 1a according to the present embodiment includes a control unit 40 that controls the outputs of the first light source and the second light source. In the present embodiment, the control unit 40 controls the first luminaire 1000 including the first light source and the second luminaire 2000 including the second light source. Further, the control unit 40 can control the intensity (output) of the light emitted from the first light source and the second light source. For example, the control unit 40 can control the lighting and extinguishing of the light emitted from the first light source and the second light source. As a result, the color exhibited by the structure can be controlled by the intensity of the infrared light emitted by the first luminaire 1000, and the ambient brightness is controlled by the intensity of the visible light emitted by the second luminaire 2000. be able to. Further, the lighting system 1a can perform these controls separately.

The control unit 40 is realized by, for example, a microcomputer, but may be realized by a processor or a dedicated circuit.

The control unit 40 is, for example, a device that can be remotely controlled by the user of the lighting system 1a, such as a smart speaker or a remote controller that can be operated wirelessly. In this embodiment, the control unit 40 is an operation panel or the like embedded in a wall operated by the user of the lighting system 1a, and is connected to the lighting system 1a by wire.

[Effects, etc.]
As described above, the lighting system 1a according to the present embodiment further includes a control unit 40 that controls the outputs of the first light source and the second light source.

As a result, the color exhibited by the structure can be controlled by the intensity of the infrared light emitted by the first luminaire 1000, and the ambient brightness is controlled by the intensity of the visible light emitted by the second luminaire 2000. be able to. Further, the lighting system 1a can perform these controls separately.

(Embodiment 3)
In the first embodiment and the second embodiment, the first light source, the second light source, and the structure are housed in one or more lighting fixtures. However, it is not limited to this configuration. The third embodiment is different from the above two embodiments in that the structure constitutes a ceiling surface, a wall surface, or a floor surface of the space. In the third embodiment, detailed description of the components common to the above two embodiments will be omitted.

[Constitution]
FIG. 10 is a schematic view showing the configuration of the lighting system 1b according to the present embodiment.

The lighting system 1b according to the present embodiment includes a lighting device 3000 including a first light source that irradiates infrared light, a second light source that irradiates visible light, and a structure.

In the present embodiment, as shown in FIG. 10, the lighting device 3000 is installed on the wall surface of the space. Further, the structure included in the lighting device 3000 according to the present embodiment constitutes a wall surface of the space. More specifically, the structure included in the lighting device 3000 is arranged in the shaded area in FIG. Therefore, for a person in the space, the structure can be visually recognized as if it were a wall surface of the space.

Further, the first light source and the second light source according to the present embodiment exist between the apparent wall surface formed by the structure and the original wall surface of the space (that is, the original wall surface of the building), and are present in the structure. Toward it, irradiate infrared light and visible light. That is, the first light source and the second light source irradiate infrared light and visible light toward the structure from the direction opposite to the direction in which a person in the space looks at the structure. Further, in the present embodiment, the infrared light and visible light emitted by the first light source and the second light source are the light emitted from the lighting device 3000 via the structure, that is, the lighting system 1b illuminates the surroundings. The illumination light is 300b.

From the above, the illumination system 1b irradiates the illumination light 300b from the apparent wall surface composed of the structure by irradiating the infrared light and the visible light. Therefore, a person in the space can visually recognize the apparent wall surface composed of the structure as if it were shining. That is, the lighting system 1b is a so-called wall lighting or light wall.

Further, as described above, the first light source irradiates the structure with infrared light. Therefore, also in the present embodiment, the visible light transmission spectrum of the structure changes due to the heat generated by the irradiation of infrared light, so that the emission spectrum of the illumination light 300b changes. Further, the color of the structure according to the present embodiment changes due to heat generated by irradiation with infrared light. Therefore, since the appearance of the lighting system 1b changes, the lighting system 1b has a high design.

The first light source and the second light source are not limited to the above configuration. As described above, the structure may constitute the ceiling or floor of the space. When the structure constitutes a ceiling surface, the lighting system 1b is a so-called ceiling lighting or optical ceiling. Further, for example, the first light source and the second light source may be housed so as to be embedded in the wall member constituting the original wall surface of the building. Further, the first light source and the second light source may be housed so as to be embedded in the ceiling member or floor member constituting the original ceiling surface or floor surface of the building. Further, the first light source that irradiates infrared light may be arranged as a separate lighting fixture as in the second embodiment shown in FIG. Further, as shown in FIG. 10, the structure according to the present embodiment constitutes the entire wall surface of the space, but is not limited to this. For example, the structure may form a part of a wall surface, a ceiling surface, or a floor surface, or may be formed on a surface straddling at least two of the wall surface, the ceiling surface, or the floor surface.

(Other)
Although the lighting system according to the embodiment has been described above, the present invention is not limited to the above embodiment.

As the heat-responsive material 52 according to each embodiment, Sakura TC color, which is a temperature indicating material, was used. When this material is used, the heat-responsive material 52 exhibits color under low temperature conditions and colorless under high temperature conditions, but the heat-responsive material 52 is not limited to this. For example, the heat responsive material 52 may be colorless under low temperature conditions and colored under high temperature conditions.

In addition, it is realized by arbitrarily combining the components and functions in each embodiment within the range obtained by subjecting various modifications to each of the above embodiments to those skilled in the art or the gist of the present invention. Forms are also included in the present invention.

1 Lighting system 10 1st light source 100 Infrared light 20 2nd light source 200 Visible light 40 Control unit 50 Structure 52 Thermal responsive material 53 Light absorbing material

Claims (9)

The first light source that irradiates infrared light,
A second light source that irradiates visible light,
It is provided with a structure that is irradiated with the infrared light and the visible light and has translucency.
The structure is
A light absorbing material that emits heat by absorbing infrared light,
A lighting system having a heat-responsive material whose transmission spectrum of visible light changes in response to heat. The structure further comprises a resin composition.
The lighting system according to claim 1, wherein the resin composition disperses and holds the light absorbing material and the heat responsive material. The lighting system according to claim 1 or 2, wherein the heat-responsive material is a temperature indicating material. The temperature indicating material contains an electron-donating color-forming organic compound, an electron-accepting compound, and an organic compound medium.
The lighting system according to claim 3, wherein the organic compound medium reversibly proceeds a color reaction by the electron-donating color-developing organic compound and the electron-accepting compound. The lighting system according to claim 3 or 4, wherein the temperature indicating material is encapsulated in microcapsules. The lighting system according to any one of claims 1 to 5, wherein the structure further comprises a dye or a pigment. The lighting system according to any one of claims 1 to 6, wherein the first light source and the second light source are solid light sources. The lighting system according to claim 7, wherein the solid-state light source is a semiconductor laser light source or an LED light source. The lighting system according to any one of claims 1 to 8, further comprising a control unit that controls the output of the first light source and the second light source.

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