JP2021026953A - Lighting fixture, component for lighting fixture, lighting system, method of installing lighting fixture, and building material or vehicle - Google Patents

Abstract

To provide a lighting fixture capable of providing a variety of spatial presentations.SOLUTION: There is provided a lighting fixture that has: a substrate which has first and second surfaces, and an end surface connecting both surfaces, also has an average internal transmissivity of 15% per 1,000 mm to light having a wavelength of 375-415 nm, and is transparent to light in a visible light range of 400-750 nm in wavelength; a light source for letting ultraviolet light impinge on the end surface; and a conversion layer which is installed on the first surface, and includes a color conversion material including an inorganic substance, wherein when the intensity peak on the longest-wavelength side of an excitation spectrum of the color conversion material is standardized to 100 and a wavelength on a long-wavelength side where the intensity is 50 at the intensity peak is designated as an excitation wavelength end, the excitation wavelength end is 450 nm or less, and at least one intensity peak of a light emission spectrum of the color conversion material is in the visible light range. A haze of the substrate measured in combination with the conversion layer is 20% or less.SELECTED DRAWING: Figure 1

Description

The present invention relates to a luminaire.

In modern society, luminaires are installed and used in various places such as houses, offices, factories, and stores, such as buildings, facilities, and outdoors, and are no longer indispensable to human life. ing.

Recently, LED lighting fixtures have begun to spread in place of fluorescent lamps from the viewpoints of energy saving and life.

Japanese Unexamined Patent Publication No. 2001-125497 JP-A-2015-72896 Japanese Unexamined Patent Publication No. 5-303017

In recent years, it has been proposed and partially implemented to produce a desired space by effectively utilizing the light radiated from a lighting fixture in various scenes.

For example, in a store that sells food, it is proposed to vividly express the color of the food and produce freshness by appropriately selecting a spotlight or the like. In addition, it has been proposed that at stores selling cosmetics, it is possible to produce a beautiful and healthy skin color by properly selecting a ceiling light.

In particular, LED lighting fixtures, which have become popular in recent years, have good color rendering properties and can relatively easily express colors close to those when illuminated by natural light, and are therefore suitable as a tool for creating a space as described above. May be available for.

However, there is a limit to the production of space by lighting equipment. That is, since the luminaire is always arranged in the space, it becomes difficult to construct the target space unless the luminaire itself matches the space. Therefore, the dimensions, shapes and / or colors of luminaires tend to be limited to some extent.

On the other hand, recently, indirect lighting has also been used as a technique for creating a desired atmosphere by using a lighting fixture.

In indirect lighting, the luminaire is made invisible, and the light emitted from the luminaire is reflected by the ceiling, walls, and / or floor of the building and is indirectly taken in. This makes it possible to create various spaces such as a soft and calm atmosphere.

However, in indirect lighting, it is necessary to hide the entire luminaire, it is difficult to use a luminaire with a large size, there is a problem that the space becomes narrow due to the installation of the blindfold, and there are restrictions that the layout of the installation is restricted. ..

As described above, in the conventional lighting fixtures, there is a limit to the range of realization of spatial production even when indirect lighting is used. On the contrary, if the above-mentioned restrictions can be reduced in the lighting equipment, it is considered that a richer and more varied space can be produced.

The present invention has been made in view of such a background, and an object of the present invention is to provide a lighting fixture capable of producing a wider variety of spaces and a component for the lighting fixture.

In the present invention, it has a first surface and a second surface facing each other and an end surface connecting both surfaces, and the average internal transmission rate of light in the wavelength range of 375 nm to 415 nm is 15% or more per 1000 mm. When the wavelength range of 400 nm to 750 nm is referred to as a visible light region, a substrate having a visible light transmittance of 80% or more with respect to light in the visible light region, a light source that injects ultraviolet rays into the end face, and the first A wavelength on the long wavelength side where the intensity peak on the longest wavelength side of the excitation spectrum of the color conversion material, which is installed on the surface and contains a color conversion material containing an inorganic substance, is standardized to 100, and the intensity is 50 at the intensity peak. Is referred to as an excitation wavelength end, the conversion layer has a conversion layer in which the excitation wavelength end is 450 nm or less and at least one intensity peak of the emission spectrum of the color conversion material is in the visible light region. Lighting fixtures are provided in which the haze of the substrate, measured in conjunction with the layers, is 20% or less.

Here, the substrate may be a glass substrate.

Further, the conversion layer may be in the form of a continuous film or a dot pattern.

Further, the conversion layer has a plurality of types of color conversion materials, and in each of the plurality of types of color conversion materials, the excitation wavelength end is 450 nm or less, and at least one intensity peak of the emission spectrum is the visible light. It may be in the area.

Further, in the luminaire according to the present invention, white light may be emitted from the conversion layer.

Further, in the conversion layer, the blending ratio of each color conversion material per unit area may be constant in the plane.

Further, the color conversion material exists in a pattern of dots, and the size and / or number density of the dots may increase in one direction when viewed from the side of the first surface.

Further, the conversion layer has a continuous film-like morphology, and the thickness of the conversion layer may increase in one direction.

Further, in the present invention, it has a first surface and a second surface facing each other and an end surface connecting both surfaces, and the average internal transmission rate of light in the wavelength range of 375 nm to 415 nm is 15% or more per 1000 mm. When the wavelength range of 400 nm to 750 nm is referred to as a visible light region, it is installed on a substrate and the first surface of the substrate having a visible light transmittance of 80% or more with respect to light in the visible light region. Including a color conversion material containing an inorganic substance, the intensity peak on the longest wavelength side of the excitation spectrum of the color conversion material is standardized to 100, and the wavelength on the long wavelength side where the intensity is 50 at the intensity peak is the excitation wavelength end. When referred to, it has a conversion layer having an excitation wavelength end of 450 nm or less and at least one intensity peak of the emission spectrum of the color conversion material in the visible light region, and is combined with the conversion layer. Parts for lighting fixtures are provided in which the haze of the substrate to be measured is 20% or less.

Further, in the present invention, the above-mentioned luminaire and the building material or vehicle in which the luminaire is installed are used.
A lighting system is provided that comprises a connecting member that couples the luminaire to the building material or vehicle.

Here, the building material or vehicle may be the ceiling, wall, or floor of the building or vehicle.

Further, the connecting member may include a transparent adhesive, and the luminaire may be bonded to the building material or the vehicle via the transparent adhesive installed on the second surface of the substrate.

Further, the present invention provides a method for installing a luminaire in which the above-mentioned luminaire is installed on the building material or the vehicle so that the second surface of the substrate faces the building material or the vehicle.

Further, the present invention provides a building material or a vehicle to which the above-mentioned luminaire is attached.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a lighting fixture capable of producing a wider variety of spaces and a component for the lighting fixture.

It is a figure which showed typically one structural example of the luminaire according to one Embodiment of this invention. It is a graph which showed the internal transmittance per 1000 mm in three kinds of glass collectively. It is a graph which showed the relationship between the propagation distance and the internal transmittance at the time of propagating ultraviolet rays with a wavelength of 385 nm in three kinds of glasses. It is a figure which showed typically an example of the lighting system including the lighting fixture by one Embodiment of this invention.

As described above, in the conventional lighting fixtures, even if they are used as a tool for spatial production, there is a problem that the range of production is narrowed due to many restrictions. On the contrary, if the above-mentioned restrictions can be reduced in the lighting equipment, it is considered that a richer and more varied space can be produced.

From such a point of view, eliminating the existence of the luminaire installed in the space from the human consciousness, that is, "invisible" the luminaire, can eliminate many of the restrictions so far.

Here, "invisible" of a luminaire is different from indirect lighting in which the entire luminaire is covered with a blindfold, and the luminaire is made invisible even when the light emitting part is exposed. That is, it means that the part that emits light is made "transparent" when the luminaire is off. In this case, unlike indirect lighting, a large luminaire can be used and the problem of installation layout can be significantly reduced.

As a result of diligent research on a luminaire for realizing such "invisibleness", the inventors of the present application have found that such a luminaire can be realized by a specific configuration, and have reached the present invention. ..

Therefore, in one embodiment of the present invention
It has a first surface and a second surface facing each other and an end surface connecting both surfaces, and has an average internal transmission of light in the wavelength range of 375 nm to 415 nm of 15% or more per 1000 mm, and a wavelength of 400 nm to 750 nm. When the range of is referred to as a visible light region, it is installed on a substrate, a light source that injects ultraviolet rays into the end face, and the first surface having a visible light transmittance of 80% or more with respect to light in the visible light region. Including a color conversion material containing an inorganic substance, the intensity peak on the longest wavelength side of the excitation spectrum of the color conversion material is standardized to 100, and the wavelength on the long wavelength side where the intensity is 50 at the intensity peak is the excitation wavelength end. When referred to, it has a conversion layer having an excitation wavelength end of 450 nm or less and at least one intensity peak of the emission spectrum of the color conversion material in the visible light region, and is combined with the conversion layer. Lighting equipment is provided in which the haze of the substrate to be measured is 20% or less.

In the luminaire according to the embodiment of the present invention, since the substrate and the conversion layer have the above-mentioned characteristics, the "light emitting portion" can be made transparent.

In the present application, the "light emitting portion" means a portion in which a substrate and a conversion layer are combined in a luminaire according to an embodiment of the present invention. Further, in the present application, "transparent" means that the visible light transmittance with respect to the light in _{the visible light region λ V is 80% or more.}

In such a luminaire, when the luminaire is on, the light emitting part emits light and exerts the function of emitting light, while when the luminaire is off, the light emitting part of the luminaire is transparent, so that the human eye can see it. It can be difficult to see.

Therefore, in such a luminaire, the luminaire can be blended into the space and the material contained in the space to make the luminaire inconspicuous. That is, it is possible to realize "invisible" lighting equipment.

Further, as a result, in the luminaire according to the embodiment of the present invention, there are no restrictions that can be caused by the luminaire itself as in the conventional case, and it is possible to produce a more diverse space.

(Lighting fixture according to one embodiment of the present invention)
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 schematically shows a configuration example of a lighting fixture according to an embodiment of the present invention.

As shown in FIG. 1, the luminaire (hereinafter, referred to as “first luminaire”) 100 according to the embodiment of the present invention includes a light source 110, a substrate 120, and a conversion layer 140.

In the first luminaire 100, the light source 110 has a role of radiating ultraviolet rays 112 toward the substrate 120.

The substrate 120 has a first surface 122 and a second surface 124 facing each other, and an end surface 126 connecting both surfaces 122 and 124.

In the example shown in FIG. 1, the substrate 120 has a substantially rectangular shape in a top view, and therefore, the number of end faces 126 is four. However, the number of end faces 126 of the substrate 120 is not particularly limited. For example, when the substrate 120 is top-view, substantially circular or elliptical, the number of end faces 126 is one. Further, for example, when the substrate 120 has a shape like a rugby ball when viewed from above, the number of end faces 126 is two. Further, for example, when the substrate 120 is viewed from above and has a substantially triangular shape, the number of end faces 126 is three. The same applies to the case of other numbers of end faces 126.

The substrate 120 functions as a light guide member for ultraviolet rays 112 incident from the light source 110.

The substrate 120 is characterized in that the average internal transmittance of light in the wavelength range of 375 nm to 415 nm (hereinafter referred to as “near-ultraviolet region λ _{U”) is 15% or more per 1000 mm.}

The substrate 120 is not limited to a flat shape, and may have a curved surface.

The conversion layer 140 functions as a light conversion member that is excited by ultraviolet rays 112 incident from the substrate 120 _{and emits light having a wavelength within the visible light region λ V.}

Therefore, the conversion layer 140 includes at least one kind of color conversion material.

The color conversion material is composed of a material containing an inorganic substance. Further, the color conversion material emits light having a peak in the _{visible light region λ V.} Further, the color conversion material is excited when the intensity peak on the longest wavelength side of the excitation spectrum is standardized to 100, and the wavelength on the long wavelength side where the intensity becomes 50 at the intensity peak is referred _{to as the excitation wavelength end λ E.} It is selected from those having a wavelength end λ _{E of 450 nm or less.}

In the first luminaire 100, the haze of the substrate 120 measured together with the conversion layer 140 is 20% or less.

Here, haze is defined as a percentage of transmitted light passing through the measurement target, which is deviated by 2.5 ° or more from the incident light due to forward scattering. Haze is also measured by the method described in JIS K 7136: 2000.

In the present application, light (incident light) is incident from the side of the second surface 124 of the substrate 120, and the transmitted light is measured from the side of the conversion layer 140.

Next, the operation of the first luminaire 100 shown in FIG. 1 will be described.

When the first luminaire 100 is turned on, first, ultraviolet rays 112 are incident from the light source 110 toward one end surface 126 of the substrate 120. The ultraviolet rays 112 are incident on the substrate 120 under total reflection conditions.

Next, the ultraviolet rays 112 incident on the substrate 120 propagate toward the opposite end surface 126 while repeating internal reflection on the first surface 122 and the second surface 124 in the substrate 120.

In the substrate 120, when the first surface 122 or the second surface 124 is circular, for example, when there is only one end face 126, the ultraviolet rays 112 incident on the substrate 120 are different from the incident position of the end face 126. Propagate toward the opposite position.

As described above, the substrate 120 is configured to have sufficient internal transmittance with respect to light _{in the near-ultraviolet region λ U.} Therefore, even if the substrate 120 has a large area and the distance between the opposing ends 126 of the substrate 120 is relatively long, the ultraviolet rays 112 propagate in the substrate 120 without being attenuated so much. Can be done.

In the process of propagation, some UV 112 is incident on the conversion layer 140 placed on the first surface 122.

As described above, the conversion layer 140 contains at least one kind of color conversion material. This color conversion material is excited by ultraviolet light 112 and emits another light having _{a wavelength within the visible light region λ V.}

Therefore, when the ultraviolet rays 112 are incident on the conversion layer 140, light of a predetermined color is emitted from the conversion layer 140.

As a result, in the first luminaire 100, the light emitting portion can be made to emit light in a predetermined color. Further, for example, when a plurality of types of color conversion materials are contained in the conversion layer 140, it is possible to radiate white light from the light emitting portion by mixing a plurality of emission colors.

In the first luminaire 100, light can be emitted from both sides of the light emitting portion, that is, both sides of the conversion layer 140 and the side of the second surface 124 of the substrate 120.

Here, the substrate 120 has a feature that it is transparent to light in _{the visible light region λ V.}

Further, the haze of the substrate 120 measured together with the conversion layer 140 is suppressed to 20% or less. Therefore, in the first luminaire 100, scattering can be significantly suppressed.

Therefore, when the first luminaire 100 is off, the light emitting portion of the first luminaire 100 becomes transparent and difficult to see.

In particular, in the first lighting fixture 100, one or more color conversion materials contained in the conversion layer 140 each standardize the intensity peak on the longest wavelength side of the excitation spectrum to 100, and at the intensity peak. , when the intensity is called 50 become long wavelength side excitation wavelength end lambda _E wavelength of the excitation wavelength end lambda _E is characterized in that at 450nm or less.

By adopting a color conversion material having such characteristics, the problem that the conversion layer 140 is emitted by external light can be significantly suppressed. That is, when _{a color conversion material having an excitation wavelength end λ E} of more than 450 nm defined as described above is used, the color conversion material contained in the conversion layer 140 is excited by external light, and unintended light emission may occur. The sex becomes high. In this case, even if the luminaire is off, the light emitting portion emits light due to external light, and it becomes difficult to realize "invisible" of the luminaire.

However, when a color conversion material having an excitation wavelength end λ _E of 450 nm or less is used as the color conversion material contained in the conversion layer 140, such a problem can be solved or suppressed.

Therefore, due to these effects, the light emitting portion of the first luminaire 100 can be made transparent, whereby the first luminaire 100 can be "invisible".

(For each component)
Next, each member included in the luminaire according to the embodiment of the present invention will be described in more detail. Here, the constituent members of the first luminaire 100 having the configuration shown in FIG. 1 will be described as an example. Therefore, the reference numerals shown in FIG. 1 are used to represent each component.

(Light source 110)
The light source 110 has a role of incident ultraviolet rays 112 on the substrate 120.

The specifications of the light source 110 are not particularly limited, but it is preferable that the ultraviolet rays 112 incident on the substrate 120 have an emission peak in _{the near-ultraviolet region λ U described above.}

The light source 110 may be, for example, an LED light source that radiates ultraviolet rays, particularly near-ultraviolet rays. Alternatively, of the light emitted from light sources such as high-pressure mercury lamps, xenon lamps, and metal halide lamps, _{only the light in the near-ultraviolet region λ U} may be extracted and used as incident light.

The light from the light source 110 may be incident on the end face 126 of the substrate 120 via an optical fiber or the like.

In the example shown in FIG. 1, the light source 110 is arranged so as to face only one end surface 126 of the substrate 120.

However, when the substrate 120 has a plurality of end faces 126, the light source 110 may be arranged on the plurality of end faces 126.

For example, when the substrate 120 has two opposite end faces 126, the light source 110 may be installed on both end faces 126. Further, as shown in FIG. 1, when the substrate 120 has four end faces 126, the light sources 110 may be installed on the three end faces 126. Alternatively, the light source 110 may be installed on two of the four end faces 126 that do not face each other.

In addition to this, various installation modes can be considered for the light source 110.

In the first luminaire 100, the light source 110 can be retrofitted.

Therefore, one embodiment of the present invention includes an aspect as a component for a luminaire, in which the light source 110 is an option. The component for such a luminaire does not include the light source 110 and may have a substrate 120 and a conversion layer 140.

(Board 120)
The substrate 120 functions as a light guide member for ultraviolet rays 112 incident from the light source 110. Therefore, as described above, the substrate 120 is selected from those having a wavelength range of 375 nm to 415 nm, that is, an average internal transmittance of light in the _{near-ultraviolet region λ U of 15% or more per 1000 mm.}

The average internal transmittance is preferably 30% or more per 1000 mm, and more preferably 40% or more per 1000 mm.

Further, the substrate 120 is transparent to light in the _{visible light region λ V.} In the substrate 120, the visible light _{transmittance for light in the visible light region λ V} is preferably 85% or more.

Here, the visible light transmittance is calculated as follows. First, using a spectrophotometer, light is incident on one surface of the substrate at an incident angle of 0 °, and the spectral transmittance at a wavelength of 400 to 750 nm is measured among the total transmittance emitted on the other surface. Multiplying this measured value by the spectrum of CIE daylight D65 at each wavelength and the color matching function y (λ) is added in the region of wavelengths of 400 to 750 nm to calculate the value Y'. Further, the measurement is performed in the same manner without the substrate, and YL'is calculated. Visible light transmittance can be obtained by dividing Y'by YL'.

In the present application, the average internal transmittance of light per 1000 mm in the near-ultraviolet region λ _{U is calculated as follows.}

First, a sample having a size of about 51 mm in length × about 51 mm in width is collected from a substantially central portion of the substrate to be evaluated.

Next, the sample is ground using free abrasive grains of colloidal silica or cerium oxide to prepare a plate-shaped sample having a length of 50 mm, a width of 50 mm, and a height of 1.8 mm. The material of the abrasive grains may be any material that can be mirror-polished, and is not limited to the above.

In the prepared sample, two facing surfaces of 50 mm in length × 50 mm in width are referred to as a first main surface and a second main surface, respectively. Further, a set of two opposing end faces having a height of 1.8 mm are referred to as a first end face and a second end face, respectively. Further, another set of two opposing end faces having a height of 1.8 mm are referred to as a third end face and a fourth end face, respectively.

The sample is prepared so that the arithmetic mean roughness Ra is 5 nm or less on all six surfaces, that is, the two main surfaces and the first to fourth end surfaces. In addition, the sample is prepared so that the angles formed by the adjacent surfaces are all 90 °.

If the thickness of the original substrate is less than 1.8 mm, grinding in the thickness direction of the sample is unnecessary.

Next, to measure the transmittance T _A in the resulting samples.

The transmittance T _A is the first end face of the sample, the light incident from the normal direction is transmitted through the sample, transmittance in the transmittance, i.e. 50mm length when emitted from the second end face Represents.

For the measurement, a spectroscopic measuring device (for example, UH4150: manufactured by Hitachi High-Technologies Corporation) capable of measuring with a length of 50 mm is used. Further, the beam width of the incident light is narrower than the thickness of the sample, and therefore a slit or the like may be used.

The wavelength of the light to be measured is in the range of 350 nm to 800 nm, and the measurement is performed at a pitch of 1 nm.

Next, the reflectance _{RA of the} sample is evaluated.

The reflectance _RA represents the reflectance of the first end face and the second end face in the sample.

For _{the evaluation of reflectance RA} , the g-line (435.8 nm), F-line (486.1 nm), e-line (546.1 nm), and d-line (d-line) of the sample were measured by the V-block method using a precision refractometer. The refractive index at each wavelength of 587.6 nm) and C line (656.3 nm) is measured at room temperature.

Next, using each measured refractive index, the coefficients B1, B2, B3, C1, C2, and C3 in the Cellmeier dispersion formula represented by the following equation (1) are minimized by curve fitting. Determined by the square method:

n _{A = [1} + {B 1 λ ² / (λ ² −C ₁ )} + {B ₂ λ ² / (λ ² −C ₂ )} +
{B ₃ λ ² / (λ ^2- C ₃ )}] ^0.5 (1)

In equation (1), λ is a wavelength. Accordingly, the refractive index n _A of the sample is determined.

Using the refractive index n _{A of the sample, the reflectance RA} at the first and second end faces of the sample can be obtained from the following equation (2):

_RA = (1-n _A ) ² / (1 + n _A ) ² (2)

From the obtained transmission T _A and reflectance R _A, using the following equation (3), internal transmittance T _in over the length of the 50mm from a first end surface of the sample to the second end surface can be obtained :

T _in = [-(1- _{RA A} ) ² + {(1- _{RA A} ) ⁴ + 4T _A ² R _A ² } ^0.5 ] / (2 T _A R _A ² )
Equation (3)

Further, by using the internal transmittance _{T in} at 50mm length, the following equation (4), the internal transmittance _{T In1000} per 1000mm is required:

T in ₁₀₀₀ = T _in ²⁰ (4)

When the vertical or horizontal dimension of the sample is less than 50 mm, the internal transmittance _Tin1000 per 1000 mm is set to the dimension from the first end face to the second end face of the sample as X mm.

^{_{T in1000 = T in 1000 / X}} (5) formula

Is required by.

_{The internal transmittance Tin 1000} obtained in this way is a value at each wavelength. The average internal transmittance of light in the range of 375 _{nm to 415 nm can be obtained by arithmetically averaging the values of the internal transmittance Tin1000} calculated in 1 nm increments in the wavelength range of 375 nm to 415 nm.

The substrate 120 may be made of any material as long as the above conditions are satisfied, and may be made of, for example, glass or resin.

When the substrate 120 is made of glass, the glass is preferably highly transparent glass.

Highly transparent glass is characterized by having few impurities. _{For example, the mass concentration of CeO 2} contained in the glass is less than 1000 ppm, _{the mass concentration of TiO 2} is less than 10000 ppm, the mass concentration of SnO ₂ is less than 10000 ppm, and the mass concentration of V ₂ O ₅ is less than 10000 ppm. Is less than 0.5 ppm, the mass concentration of NiO is less than 5 ppm, and _{the mass concentration of Cr 2} O ₃ is less than 5 ppm.

The total mass concentration of total iron oxide _{in terms of Fe 2} O ₃ is less than 500 ppm, preferably less than 150 ppm, more preferably less than 100 ppm, and even more preferably less than 50 ppm.

The divalent ratio of Fe contained is, for example, 0 to 50%, preferably 0 to 30%, and more preferably 1 to 20%.

Highly permeable glass is an oxide-based mass percentage display, SiO ₂ is 55 to 80%, B ₂ O _{3 is 0} to 15%, Al ₂ O ₃ is 0 to 25%, MgO is 0 to 15%, and so on. CaO 0-20% of SrO 0 to 15% 0 to 15% of BaO, 0 to 15% of Li ₂ O, 3 to 20% of Na ₂ O, including _{K 2} O _0~10%. Further, ZrO ₂ may be contained in less than 3%, ZnO in less than 5%, SO ₃ in less than 2%, F in less than 1%, and Cl in less than 1%.

Examples of such glass include a light guide plate glass XCV-1 manufactured by AGC Inc. and a solar cell cover glass. The light guide plate glass XCV-1 manufactured by AGC Co., Ltd. has an oxide-based mass percentage display, SiO ₂ of 69.9%, Al ₂ O ₃ of 3.0%, and Ca O of 8.0%. SrO is 4.0%, BaO is 4.0%, Na ₂ O is 11.0%, SO ₃ is 0.2%, Fe ₂ O ₃ is 0.003%, NiO is 0.4 ppm, Cr ₂ O. _It contains 0.4 ppm of 3. The solar cell cover glass manufactured by AGC Co., Ltd. has an oxide-based mass percentage display, which contains 71.5% _{SiO 2 , 1.3% Al 2} O ₃ , 4.5% MgO, and 8 CaO. 6.6%, Na ₂ O 12.9%, K ₂ O 1.0%, SO ₃ 0.2%, Fe ₂ O ₃ 0.008%, Ni O _{1.5 ppm, Cr 2 O 3} Contains 2.0 ppm.

FIG. 2 summarizes the internal transmittances per 1000 mm of the three types of glass.

Glass A corresponds to the above-mentioned XCV-1 glass. Further, the glass B corresponds to the above-mentioned glass for a solar cell cover. Further, the glass C corresponds to a general soda lime glass. Glass C contains 0.07% of _{Fe 2} O _3.

From FIG. 2, _{it can be seen that the glass C has a low internal transmittance of light in the near-ultraviolet region λ U} and cannot be used as the substrate 120 for the first luminaire 100. On the other hand, the glass A and the glass B have a _{sufficiently high internal transmittance of light in the near-ultraviolet region λ U} , and can be suitably used as the substrate 120 for the first luminaire 100.

The average internal transmittance of light in the near-ultraviolet region λ _{U of the glass A is 56.8% per 1000 mm.} The average internal transmittance of light in the near-ultraviolet region λ _{U in the glass B is 45.3% per 1000 mm.}

The substrate 120 made of glass may be chemically strengthened.

The thickness of the substrate 120 is preferably in the range of 1 mm to 10 mm. When the thickness is less than 1 mm, the influence of the reflection loss of the light to be guided becomes relatively large.

Various functional films may be installed on the substrate 120. Examples of the functional film include a low-reflection film, an anti-fingerprint film, an ultraviolet ray blocking film, and a protective film.

Further, a touch panel having a transparent electrode pattern may be formed on the second surface 124 of the substrate 120.

The haze of the substrate 120 measured together with the conversion layer 140 is preferably 20% or less, and the haze is preferably 10% or less.

(Conversion layer 140)
The thickness of the conversion layer 140 is, for example, in the range of 1 μm to 100 μm. The thickness of the conversion layer 140 is preferably in the range of 10 μm to 80 μm. As will be described later, the thickness of the conversion layer 140 does not necessarily have to be constant in the plane, and the thickness may gradually increase along a certain direction.

The conversion layer 140 has a color conversion material. The color conversion material is composed of a material containing an inorganic substance.

By selecting a material containing an inorganic substance as the color conversion material contained in the conversion layer 140, it is possible to improve the weather resistance.

The conversion layer 140 contains at least one type of color conversion material. Moreover, it is preferable that the type of the color conversion material is two or more. For example, white light can be formed by combining the blue light from the first color conversion material and the yellow light from the second color conversion material.

When the conversion layer 140 contains two or more kinds of color conversion materials, each color conversion material is _{selected so that the excitation wavelength end λ E} is 450 nm or less in each color conversion material.

The excitation wavelength end λ _E of the color conversion material is preferably 430 nm or less.

Such color conversion materials, for example, Cumulus phosphor _{(Ca 1-x-y,} Sr x, Eu y) 7 (SiO 3) 6 Cl 2 (0.167 <x / (1-x-y) <2.5; 0.01 <y <0.3). The Kulms phosphor is an inorganic color conversion material that emits light having a peak wavelength of about 570 nm when excited.

However, this is just an example, and it is possible to use a color conversion material containing other inorganic substances. For example, Cs ₃ Cu ₂ I ₅ , Sr ₅ (PO ₄ ) ₃ F: Eu ²⁺ , Sr ₅ (PO ₄ ) ₃ Cl: Eu ²⁺ , Sr ₅ (PO ₄ ) ₃ Br: Eu ²⁺ , Ca ₅ (PO ₄₎ ) ₃ Cl: Eu ²⁺ , Sr ₅ (PO ₄ ) ₃ Cl: Eu ²⁺ , Ba ₅ (PO ₄ ) ₃ Cl: Eu ²⁺ , ZnS: Ag, BaMgAl ₁₀ O ₁₇ : Eu ²⁺ , Mn ²⁺ , (Ba, Ca) , Sr) ₁₀ (PO ₄ ) ₆ Cl ₂ : Eu ²⁺ , (Sr, Ba) ₂ SiO ₄ : Eu ²⁺ , (C ₁₀ H ₇ CH ₂ NH ₃ ) ₂ PbBr _x I _4-x (x> 2), Examples thereof include CsPbCl ₃ , CsPbBr ₃ , CsPbI ₃ , CdSe, ZnSe, and CdS.

The color conversion material has an average particle size in the range of 2 nm to 10 μm. The average particle size of the color conversion material is preferably in the range of 5 μm to 10 μm.

The form of the conversion layer 140 can be roughly divided into the following two types:
(I) A continuous thin film having a predetermined thickness over the plane, and (ii) a pattern of dots arranged two-dimensionally.

Hereinafter, the conversion layer 140 of each aspect will be described.

(Conversion layer 140 in the form of (i))
The conversion layer 140 of the form (i) has a structure in which the color conversion material is dispersed in the matrix.

As the material of the matrix, for example, a resin, a hydrolyzed condensate of a hydrolyzable metal compound, glass, or the like can be used.

Examples of the resin include silicone resin, acrylic resin, polyester resin (polyethylene terephthalate resin, etc.), polyurethane resin, sulfur-containing polyurethane resin, polyurethane acrylate resin, polycarbonate resin, polyvinyl acetal resin (polyvinyl butyral resin, etc.), cycloolefin resin, and the like. A fluorene ring-containing resin, a polyvinyl alcohol resin, an ethylene-vinyl acetate copolymer resin, an ethylene-acrylic copolymer resin, a vinyl chloride resin, an ionomer and the like can be used.

The "resin" may be in the state of a cured resin or in the state of a monomer or an oligomer when mixed with a color conversion material or the like. In the case of monomers and oligomers, by adding a polymerization initiator, they are polymerized by heating or the like to become a "resin".

In order to achieve low haze of the conversion layer 140, the refractive index of the resin matrix is matched with the refractive index of the color conversion material. At this time, a refractive index adjusting agent may be used.

For example, when the refractive index of the resin constituting the matrix is smaller than the refractive index of the color conversion material, a refractive index adjusting agent having a high refractive index may be added to the matrix to increase the refractive index of the matrix.

Refractive index adjusters used for such high refractive index include TiO ₂ , Al ₂ O ₃ , ZrO ₂ , CeO ₂ , Fe ₃ O ₄ , Fe ₂ O ₃ , WO ₃ , and Y ₂ O. _{There are 3} and so on. On the other hand, examples of the refractive index adjusting agent used for lowering the refractive index include hollow SiO ₂ , porous SiO ₂ , MgF ₂ , and CaF _2.

The refractive index adjusting agent is preferably fine particles having an average particle size of less than 100 nm in order to suppress light scattering.

Further, a dispersant may be further added to the matrix in order to prevent agglomeration of the color conversion material and the refractive index adjusting agent in the matrix and improve the dispersibility in these matrices.

Further, the refractive index adjusting agent may be treated with a silane coupling agent or the like.

Next, as the hydrolyzable condensate of the hydrolyzable metal compound, silicon oxide, aluminum oxide, titanium oxide, niobium oxide, zirconium oxide, tantalum oxide and the like can be used.

Also in the matrix of the hydrolyzed condensate, it is preferable to match the refractive index of the matrix with the refractive index of the color conversion material. Therefore, a plurality of materials may be selected from the above materials. Alternatively, the above-mentioned refractive index adjusting agent may be added to the matrix of the hydrolyzed condensate.

The matrix of the hydrolyzed condensate can be formed, for example, by preparing a sol-gel solution containing an organometallic solution and organometallic particles, applying the sol-gel solution to the surface of the substrate 120, drying, and then heat-treating. In this process, the conversion layer 140 can be formed by mixing the color conversion material in the sol-gel solution in advance.

The glass matrix, on the other hand, includes a network former. As the network former, for example, one or more of _{P 2} O ₅ , SiO ₂ , B ₂ O ₃ , GeO ₂ , and TeO _{2 may be used.}

Further, in the glass matrix, as high refractive index components, TiO ₂ , Nb ₂ O ₅ , WO ₃ , Bi ₂ O ₃ , La ₂ O ₃ , Gd ₂ O ₃ , Y ₂ O ₃ , ZrO ₂ , ZnO, One or more of BaO, PbO, and Sb ₂ O _{3 may be included.}

Further, in order to adjust the properties of the glass, at least one of an alkaline oxide, an alkaline earth oxide, and a fluoride may be added to the glass matrix within a range that does not affect the refractive index.

Accordingly, the glass of the matrix, for _{example, B 2 O 3 -ZnO-La} 2 O 3 _{based, P 2 O 5 -B 2 O} 3 -R '2 O-R "O-TiO 2 -Nb 2 O 5 -WO _3- Bi ₂ O ₃ series, TeO _2- ZnO series, B ₂ O _3- Bi ₂ O ₃ series, SiO _2- Bi ₂ O ₃ series, SiO _2- ZnO series, B ₂ O _3- ZnO series, and P ₂ O _5- ZnO system or the like may be used. Here, R'indicates an alkali metal element and R'indicates an alkaline earth metal element.

The method for forming the glass matrix is not particularly limited, but a so-called "frit paste method" may be used. In the frit paste method, a paste containing glass powder, resin, solvent and the like called frit paste is prepared. A glass layer can be formed by applying this frit paste to the surface of the substrate 120, patterning it, and then firing the frit paste. In this process, the conversion layer 140 can be formed by mixing the color conversion material in the frit paste in advance.

In any case, the content of the color conversion material in the matrix is, for example, in the range of 1% by mass to 90% by mass. The content of the color conversion material in the matrix is preferably in the range of 2% by mass to 30% by mass.

Here, in the form (i), the thickness of the conversion layer 140 may be gradually increased as the distance from the light source 110 increases. As a result, the problem that the emission brightness of the light emitted from the conversion layer 140 is lowered at a position far from the light source 110 due to the attenuation of the ultraviolet rays 112 in the substrate 120 is alleviated. That is, the uniformity of light emission from the light emitting portion can be enhanced.

(Transformation layer 140 in the form of (ii))
In the case of the conversion layer 140 in the form of (ii), the conversion layer 140 is not exactly a "layer" but is composed of a pattern of dots. However, in the present application, even in such a form, the conversion “layer” 140 is described.

In the case of the form (ii), each dot contains a medium and a color conversion material. As the medium, the same material as the matrix in the case of (i) above can be used.

Further, also in the form of (ii), as in the case of (i), various additives may be added to the medium in addition to the color conversion material.

The content of the color conversion material in the medium is, for example, in the range of 1% by mass to 90% by mass. The content of the color conversion material in the medium is preferably in the range of 2% by mass to 30% by mass.

In the case of the form (ii), the dot size may be gradually increased or the dot number density may be gradually increased as the distance from the light source 110 is increased, and both the dot size and the number density may be increased. May be gradually increased. As a result, the problem that the emission brightness of the light emitted from the conversion layer 140 is lowered at a position far from the light source 110 due to the attenuation of the ultraviolet rays 112 in the substrate 120 is alleviated. That is, the uniformity of light emission from the light emitting portion can be enhanced.

(First lighting fixture 100)
Although not shown in FIG. 1, the first luminaire 100 may have yet another member.

For example, the second substrate may be installed on the side of the conversion layer 140 opposite to the substrate 120. By providing the second substrate, the conversion layer 140 can be protected. The second substrate, like the substrate 120, is transparent to light in the _{visible light region λ V.}

The second substrate may be installed so as to be in contact with the upper surface of the conversion layer 140. In this case, the upper surface of the conversion layer 140 becomes flatter, and the possibility that the ultraviolet rays 112 from the light source 110 leak to the outside through the conversion layer 140 can be further reduced.

Alternatively, the second substrate may be installed so as not to come into contact with the upper surface of the conversion layer 140. In this case, the second substrate may be joined to the substrate 120 via a sealing material installed around the second substrate. Further, in this case, the internal space surrounded by the substrate 120 and the second substrate may be filled with an inert gas or the like.

The dimensions of the first luminaire 100 are not particularly limited. However, in the first luminaire 100,
It should be noted that the substrate may have a large area of light emitting portion because it has a sufficiently large internal transmittance for light in the near-ultraviolet region λ _U.

FIG. 3 shows the relationship between the propagation distance and the internal transmittance when ultraviolet rays having a wavelength of 385 nm propagate in glass. The three types of glasses A, B, and C correspond to the glasses A, B, and C in FIG. 2, respectively.

From FIG. 3, it is possible to grasp the allowable distance from the light source in order to obtain light emission having good brightness.

For example, in the case of glass C, the internal transmittance of ultraviolet rays is reduced to 10% at a position of 200 mm from the light source. On the other hand, in the glass A and the glass B, the internal transmittance of ultraviolet rays can be maintained at 75% or more even at a position of 200 mm from the light source. Therefore, it can be seen that by using the glass A and the glass B, it is possible to obtain light emission with a small inclination of the in-plane brightness over a distance of 200 mm.

As described above, when high-transparency glass is used as the substrate 120, the distance from the end face 126 facing the light source 110 of the substrate 120 to the end face 126 on the opposite side can be 200 mm or more. This distance may be, for example, 500 mm or more, or 1000 mm or more.

(Example of application of lighting equipment according to one embodiment of the present invention)
The luminaire according to one embodiment of the present invention is not limited to this, and can be applied to various places such as a residence, a building, a facility, and an outdoor.

In particular, unlike the conventional indirect lighting, the lighting fixture according to the embodiment of the present invention does not need to be covered with a blindfold or the like, and therefore can be suitably used as a large-area lighting.

For example, when the lighting equipment according to one embodiment of the present invention is applied to a facility such as an event hall used for a concert or an exhibition, for example, it produces an unprecedented novel and / or sophisticated space. It is also possible to do.

Hereinafter, a specific example of a possible application of the lighting fixture according to the embodiment of the present invention will be described.

(Lighting system)
The lighting fixture according to the embodiment of the present invention may be attached to a building material of a building and used as a lighting system. The building material of the building may be, for example, a ceiling, a wall, or a floor.

FIG. 4 schematically shows an example of such a lighting system.

As shown in FIG. 4, the lighting system 201 has a wall member 250, and the lighting fixture according to the embodiment of the present invention is attached to the wall member 250. Here, the first luminaire 100 is used as an example of the luminaire according to the embodiment of the present invention.

The wall member 250 has a first surface 252, and a recess 254 is provided in a part of the first surface 252. The recess 254 has a bottom surface 256 and a front bank portion 258.

The first luminaire 100 is fitted into the recess 254 so that the light source 110 is on the lower side. Further, in the first luminaire 100, a transparent adhesive 270 is installed on the side of the second surface 124 of the substrate 120. Therefore, the first luminaire 100 housed in the recess 254 of the wall member 250 is coupled to the bottom surface 256 of the recess 254 via the transparent adhesive 270.

Here, a front bank portion 258 is provided in the recess 254 of the wall member 250. Therefore, when the first luminaire 100 is housed in the recess 254, the light source 110 is blindfolded by the front bank portion 258.

In such a lighting system 201, while the first luminaire 100 is off, the back side of the first luminaire 100, that is, the bottom surface 256 of the recess 254 of the wall member 250 becomes visible. That is, the first luminaire 100 becomes transparent, and "invisible" can be realized.

Also, the lighting system may have another form.

For example, in the first luminaire 100, the light source 110 may be installed on the end surface 126 on the upper side of the substrate 120, and the light source 110 may be coupled to the ceiling member via the coupling member. As the connecting member, a member having the same color as the ceiling member is used. In this case, the first luminaire 100 is attached to the ceiling member so that the first surface 122 and the second surface 124 of the substrate 120 are substantially parallel to the vertical direction.

In such an aspect of the lighting system, since the light source 110 is arranged at the boundary with the ceiling member, the light source 110 can be made inconspicuous in the line of sight. Therefore, in this case as well, it is possible to realize "invisible" of the first luminaire 100.

In addition to this, various usage modes such as the interior of a vehicle can be assumed as the lighting equipment according to the embodiment of the present invention.

(Method for manufacturing a lighting fixture according to an embodiment of the present invention)
Next, an example of a method for manufacturing a lighting fixture according to an embodiment of the present invention will be described.

The method for manufacturing a luminaire according to an embodiment of the present invention
(I) In the step (step S110) of installing the conversion layer on the substrate and forming the light emitting portion,
(II) The step of installing the light source on the end face side of the substrate (step S120),
Have.

Hereinafter, each step will be described. Here, the manufacturing method thereof will be described by taking the first lighting fixture 100 shown in FIG. 1 as an example. Therefore, the reference numerals shown in FIG. 1 are used to represent each member.

(Step S110)
First, the substrate 120 having the above-mentioned characteristics is prepared.

Next, the conversion layer 140 is formed on the first surface 122 of the substrate 120.

The conversion layer 140 may be in the form of a film as described in (i) above, or may be formed in a dot pattern as in (ii) described above.

The conversion layer 140 may be installed on the first surface 122 of the substrate 120 by, for example, a screen printing method, a spin coating method, a transfer method, a die coating method, or a bar coating method. In particular, when the conversion layer 140 is formed by the above-mentioned form (ii), that is, the pattern of dots arranged two-dimensionally, the screen printing method is preferable.

When the conversion layer 140 is formed in a film shape, the thickness may be increased along a certain direction, for example, from the side of one end face 126 of the substrate 120 to the side of the other end face 126. Further, when the conversion layer is formed by a dot pattern, the size and / or number density of dots may be determined along a certain direction, for example, from the side of one end face 126 of the substrate 120 to the side of another end face 126. It may be increased.

With such an "inclined structure", the uniformity of light emission emitted from the light emitting portion can be enhanced.

When white light is emitted from the conversion layer 140, two or more kinds of color conversion materials are used. For example, by combining a first color conversion material that emits light in the blue wavelength region and a second color conversion material that emits light in the yellow wavelength region, white light can be emitted from the conversion layer 140.

For example, when the conversion layer 140 is formed in the form (ii), that is, the dot pattern, each dot pattern contains two kinds of color conversion materials.

Here, when the second color conversion material has an excitation spectrum whose peak wavelength is included in the wavelength region of blue, the blue light generated by the first color conversion material is used for exciting the second color conversion material. There is a possibility that it will be done. In this case, the amount of blue light emitted by the first color conversion material is reduced, yellowish light is generated as a whole, and white light cannot be obtained. Since this phenomenon becomes more prominent as the distance from the light source increases, the emission color gradually changes to yellowish in the direction away from the light source, and a uniform color cannot be obtained in the plane.

In order to solve this problem and uniformly develop a desired emission color in the plane, it may be necessary to design different dot patterns for each type of color conversion material. In this case, a complicated study is required regarding the arrangement and / or size of each color conversion material.

Such a problem may occur similarly when the conversion layer 140 is in the form of (i).

However, in one embodiment of the present invention, as described above, each color conversion material contained in the conversion layer 140 is _{selected from those having an excitation wavelength end λ E} of 450 nm or less.

Therefore, even if a plurality of color conversion materials are used for the conversion layer 140, the light emission of one color conversion material is used for excitation of another color conversion material, and there is a problem that an appropriate emission color cannot be obtained as a whole. It can be significantly suppressed.

As a result, in the form of (ii), it is not necessary to design a complicated arrangement pattern for each color conversion material. That is, the compounding ratio per unit area of the color conversion material is constant in the plane, and the conversion layer 140 can be formed. Here, the compounding ratio indicates the ratio of the mass of each color conversion material to the total mass of the conversion layer 140 per unit area.

Further, also in the form (i), it is not necessary to study the complicated arrangement of each color conversion material, and it is possible to develop uniform white light only by inclining the thickness of the conversion layer 140.

(Step S120)
Next, the light source 110 is installed so as to face at least one end face 126 of the substrate 120.

As a result, the first luminaire 100 as shown in FIG. 1 can be manufactured.

As described above, instead of the first luminaire 100, it is also possible to use only the light emitting portion as a component for the luminaire. In this case, step S120 may be performed at a timing and / or location different from the timing and / or location where step S110 is performed.

The configuration and features of the luminaire according to the embodiment of the present invention have been described above by taking the first luminaire 100 as an example.

However, it will be apparent to those skilled in the art that the luminaire according to one embodiment of the present invention is not limited to the above configuration.

100 First luminaire 110 Light source 112 Ultraviolet rays 120 Board 122 First surface 124 Second surface 126 End surface 140 Conversion layer 201 Lighting system 250 Wall member 252 First surface 254 Recess 256 Bottom 258 Front bank 270 Transparent adhesive

Claims (14)

It has a first surface and a second surface facing each other and an end surface connecting both surfaces, and the average internal transmittance of light in the wavelength range of 375 nm to 415 nm is 15% or more per 1000 mm, and the wavelength is 400 nm to 750 nm. When the range of is referred to as a visible light region, the substrate and the substrate having a visible light transmittance of 80% or more with respect to light in the visible light region.
A light source that injects ultraviolet rays into the end face and
A length that is installed on the first surface, contains a color conversion material containing an inorganic substance, standardizes the intensity peak on the longest wavelength side of the excitation spectrum of the color conversion material to 100, and has an intensity of 50 at the intensity peak. When the wavelength on the wavelength side is referred to as the excitation wavelength end, the conversion layer has the excitation wavelength end of 450 nm or less and at least one intensity peak of the emission spectrum of the color conversion material in the visible light region.
Have,
A lighting fixture in which the haze of the substrate measured together with the conversion layer is 20% or less. The lighting fixture according to claim 1, wherein the substrate is a glass substrate. The luminaire according to claim 1 or 2, wherein the conversion layer is in the form of a continuous film or a dot pattern. The conversion layer has a plurality of types of color conversion materials, and in each of the plurality of types of color conversion materials, the excitation wavelength end is 450 nm or less, and at least one intensity peak of the emission spectrum is in the visible light region. The lighting equipment according to any one of claims 1 to 3. The luminaire according to claim 4, wherein white light is emitted from the conversion layer. The luminaire according to claim 4, wherein the conversion layer has a constant in-plane blending ratio of each color conversion material per unit area. Claims 1 to 6, wherein the color conversion material exists in a pattern of dots, and when viewed from the side of the first surface, the size and / or density of the dots increases in one direction. The lighting equipment described in any one. The luminaire according to any one of claims 1 to 6, wherein the conversion layer has a continuous film-like morphology, and the thickness of the conversion layer increases in one direction. It has a first surface and a second surface facing each other, and an end surface connecting both surfaces, and the average internal transmittance of light in the wavelength range of 375 nm to 415 nm is 15% or more per 1000 mm, and the wavelength is 400 nm to 400 nm. When the range of 750 nm is referred to as a visible light region, the substrate and the substrate having a visible light transmittance of 80% or more with respect to light in the visible light region.
The intensity peak on the longest wavelength side of the excitation spectrum of the color conversion material, which is installed on the first surface of the substrate and contains a color conversion material containing an inorganic substance, is standardized to 100, and the intensity is 50 at the intensity peak. When the wavelength on the long wavelength side is referred to as the excitation wavelength end, the conversion layer has the excitation wavelength end of 450 nm or less and at least one intensity peak of the emission spectrum of the color conversion material in the visible light region. ,
Have,
A component for a lighting fixture in which the haze of the substrate measured together with the conversion layer is 20% or less. The lighting fixture according to any one of claims 1 to 8.
Building materials or vehicles on which the lighting fixtures are installed
A connecting member that connects the luminaire to the building material or vehicle,
Has a lighting system. The lighting system according to claim 10, wherein the building material or vehicle is a ceiling, wall, or floor of a building or vehicle. 10. The coupling member comprises a transparent adhesive, and the luminaire is bonded to the building material or the vehicle via the transparent adhesive installed on the second surface of the substrate, claim 10 or 11. The lighting system described. A method for installing a lighting fixture according to any one of claims 1 to 8, wherein the lighting fixture is installed on the building material or vehicle so that the second surface of the substrate faces the building material or vehicle. A building material or a vehicle to which the luminaire according to any one of claims 1 to 8 is attached.

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