Lighting devices, windows with lighting functions, and window building materials

Abstract

The lighting function and the window function can be switched, and the reproduction of the sky when the lighting function is used and the visibility or light transmittance of the opposite side space when the window function is used can be achieved at the same time. The lighting device (200) comprises: a first light source (10) which emits a first light; a diffuser (20) into which the first light is incident and which emits a first scattered light; and a frame (300) which supports the first light source and the diffuser, wherein the diffuser contains nanoparticles and guides the incident first light so that the light is scattered by the nanoparticles and emitted as the first scattered light, wherein the diffuser comprises: an incident surface (f21) into which the first light is incident; a first surface (f22) into which an exit surface is formed for emitting the first scattered light; and a second surface (f23) which is opposite to the first surface, wherein the incident surface is formed at a first end of the diffuser, and the frame comprises an opening in at least a portion of an area on the first surface of the diffuser where the exit surface is formed and an area on the second surface corresponding thereto, wherein the correlated color temperature of the first scattered light is higher than the correlated color temperature of the first light.

Description

Technical Field

[0001] The invention relates to a lighting device, a window with lighting function and a building material for the window. Background Art

[0002] As an example of a lighting device that simulates a natural sky, there is a lighting system described in Patent Document 1. The lighting system described in Patent Document 1 has a first light source (2) and a lampshade-like structure (10). The lampshade-like structure (10) includes a screen structure (14) and a bottom body (12), and the bottom body (12) has a diffuse light generator (20). The diffuse light generator (20) acts as a Rayleigh diffuser, substantially does not absorb light in the visible light region, and more efficiently diffuses wavelengths shorter than the long wavelength component of the impact light. The first light source (2) and the lampshade-like structure (10) are arranged in a dark box (16). The first light source (2) is set at a position offset in the vertical direction and the horizontal direction relative to the center of the diffuse light generator (20), and the upper surface of the diffuse light generator (20) is irradiated as a whole at approximately 60 degrees, which is the main light angle.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2015-207554 Summary of the invention

[0006] Problems to be solved by the invention

[0007] However, when considering using the lighting system described in Patent Document 1 not only as a lighting device but also as a window when turned off, for example, the following problems exist. First, the lighting system described in Patent Document 1 has a first light source and a component supporting the first light source on the inner side of the diffuse light generating body (the side opposite to the emission direction of the illumination light, also referred to as the back side), and therefore, there is a problem that the back side of the diffuse light generating body cannot be opened (to a state where there is no object blocking the light).

[0008] Second, the lighting system described in Patent Document 1 adopts a backlight method, so the haze in the thickness direction of the diffuse light generator must be high. Even if the back side can be opened, the visibility and light transmittance of the back side space of the diffuse light generator are poor, and there is a problem that it is difficult to apply to windows. The reason why the haze in the thickness direction of the diffuse light generator is high in the backlight method is that in order to generate part of the divergent light (scattered light simulating the blue sky) in the relatively short (approximately the thickness) light guide path from the light from the first light source being incident from the back side of the diffuse light generator to passing through the surface, it is necessary to increase the particle concentration. In addition, another reason is to prevent the user from noticing the existence of the light source unit (device) located behind the diffuse light generator.

[0009] In lighting devices that use Rayleigh scattering to reproduce the color of natural skies such as blue sky (transparent blue, etc.), it is not enough to simply diffuse or scatter the incident white light such as so-called white lighting, but it is necessary to dim the emitted scattered light so that the light exit surface looks like the natural sky. More specifically, it is necessary to diffuse or scatter the blue wavelength light at an appropriate ratio (not too much and not too little) relative to the other wavelengths of light based on the wavelength-dependent scattering probability determined by the particle size or particle concentration. Through this dimming, the light exit body can be regarded as a luminous body with the color of the natural (deep) sky.

[0010] Therefore, when considering using a lighting device that simulates the natural sky as a window, in addition to being able to switch between the lighting function and the window function (the function of being able to visually identify the space on the opposite side of the current space, i.e., the opposite side space, from the current space through a component that divides the space, and the function of taking in light from the opposite side space), it is important to simultaneously achieve the reproducibility of the sky when using the lighting function and the visual recognizability or light transmittance of the opposite side space when using the window function.

[0011] In view of the above problems, the present invention aims to provide the following lighting device, window with lighting function and window building material: it is possible to switch the lighting function and the window function, and can simultaneously achieve the reproducibility of the sky when using lighting and the visual recognizability or light transmittance of the opposite side space when using the window.

[0012] Means for solving problems

[0013] The lighting device of the present invention is characterized in that the lighting device comprises: a first light source that emits a first light; a diffuser that allows the first light to be incident and emits a first scattered light; and a frame that supports the first light source and the diffuser, the diffuser contains nanoparticles and guides the incident first light so that it is scattered by the nanoparticles and emitted as the first scattered light, the diffuser comprises: an incident surface that allows the first light to be incident; a first surface that forms an exit surface that emits the first scattered light; and a second surface that is opposite to the first surface, the incident surface is formed at a first end of the diffuser, the frame is opened at least at a part of the region on the first surface of the diffuser where the exit surface is formed and at a region on the second surface corresponding thereto, and the correlated color temperature of the first scattered light is higher than the correlated color temperature of the first light.

[0014] In addition, the window with lighting function of the present invention is characterized in that the window with lighting function is used as a window of a building or a mobile body, and the window with lighting function has: a diffuser, which allows the first light to be incident and emits the first scattered light; and a frame, which supports the diffuser, the diffuser contains nanoparticles, and guides the incident first light so that it is scattered by the nanoparticles and emitted as the first scattered light, the diffuser has: an incident surface, which allows the first light to be incident; a first surface, which forms an exit surface for emitting the first scattered light; and a second surface, which is opposite to the first surface, the incident surface is formed at the first end of the diffuser, the frame is opened at least on a part of the area on the first surface of the diffuser where the exit surface is formed and on the area on the second surface corresponding to the first surface, and the correlated color temperature of the first scattered light is higher than the correlated color temperature of the first light.

[0015] In addition, the window building material of the present invention is characterized in that the window building material comprises: a first light source that emits a first light; a diffuser that allows the first light to be incident and emits a first scattered light; and a frame that supports the first light source and the diffuser, the diffuser contains nanoparticles and guides the incident first light so that it is scattered by the nanoparticles and emitted as the first scattered light, the diffuser comprises: an incident surface that allows the first light to be incident; a first surface that forms an exit surface that emits the first scattered light; and a second surface that is opposite to the first surface, the incident surface is formed at a first end of the diffuser, the frame is opened at least at a portion of an area on the first surface of the diffuser where the exit surface is formed and an area on the second surface corresponding thereto, and the correlated color temperature of the first scattered light is higher than the correlated color temperature of the first light.

[0016] Effects of the Invention

[0017] According to the present invention, it is possible to provide a lighting device, a window with lighting function, and a window building material that can switch between the lighting function and the window function, and can simultaneously achieve the reproducibility of the sky when using lighting and the visual recognizability or light transmittance of the opposite side space when using the window. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a perspective view showing a schematic structure of the lighting device according to Embodiment 1.

[0019] Figure 2 This is a cross-sectional view showing a schematic structure of the lighting device according to Embodiment 1.

[0020] Figure 3 This is an explanatory diagram showing a schematic configuration of a light source according to Embodiment 1.

[0021] Figure 4 This is an explanatory diagram showing an example of arrangement of light sources according to Embodiment 1.

[0022] Figure 5This is a perspective view showing an example of the diffuser according to the first embodiment.

[0023] Figure 6 It is an explanatory diagram showing an example of light guiding in the diffuser according to the first embodiment and an example of generation of scattered light simulating the sky.

[0024] Figure 7 This is a perspective view showing an example of a housing according to Embodiment 1.

[0025] Figure 8 This is a cross-sectional view showing an example of a frame body according to Embodiment 1.

[0026] Fig. 9 This is a cross-sectional view showing an example of a frame body according to Embodiment 1.

[0027] Fig.10 This is a cross-sectional view showing an example of a frame body according to Embodiment 1.

[0028] Fig.11 This is an explanatory diagram showing an installation example of the lighting device according to Embodiment 1.

[0029] Fig.12 This is an explanatory diagram showing an example of a housing according to the first embodiment.

[0030] Fig.13 This is a cross-sectional view showing an example of a frame body according to Embodiment 1.

[0031] Fig.14 This is a plan view showing an example of a housing according to Embodiment 1.

[0032] Fig.15 This is a perspective view showing an example of a housing according to Embodiment 1.

[0033] Fig.16 This is a schematic configuration diagram showing an application example of the lighting device according to Embodiment 1.

[0034] Fig.17 This is a schematic configuration diagram showing another example of the lighting device according to Embodiment 1.

[0035] Fig.18 This is a schematic configuration diagram showing another example of the lighting device according to Embodiment 1.

[0036] Fig.19 This is a schematic configuration diagram showing another example of the lighting device according to Embodiment 1.

[0037] Fig. 20 1 is a schematic diagram showing an example of a form in which the lighting device is used as a skylight.

[0038] Fig.21 2 is a cross-sectional view showing an example of a form in which the lighting device is used as a skylight.

[0039] Fig. 22 This is a diagram showing an example of the angular distribution of scattered light intensity due to Rayleigh scattering of a single particle in the first embodiment.

[0040] Fig.23 This is a cross-sectional view showing an example of the structure of the lighting device according to Modification 1.

[0041] Fig.24 This is a perspective view showing an example of the structure of a lighting device according to Modification Example 2.

[0042] Fig.25 This is a cross-sectional view showing an example of the structure of a lighting device according to Modification 2.

[0043] Fig.26 This is a cross-sectional view showing an example of the structure of a lighting device according to Modification 2.

[0044] Fig. 27 This is a cross-sectional view showing an example of the structure of a lighting device according to Modification 3.

[0045] Fig.28 This is a cross-sectional view showing an example of the structure of a lighting device according to Modification 3.

[0046] Fig.29 This is a cross-sectional view showing an example of the structure of a lighting device according to Modification 3.

[0047] Fig.30 This is a perspective view showing an example of the structure of a lighting device according to Modification 3.

[0048] Fig.31 This is a cross-sectional view showing a schematic structure of a lighting device according to Embodiment 2.

[0049] Fig.32 This is a cross-sectional view showing a schematic structure of a lighting device according to Embodiment 3. DETAILED DESCRIPTION

[0050] Hereinafter, embodiments of the lighting device, the window with lighting function, and the window building material of the present invention will be described with reference to the drawings. The following embodiments are merely examples, and the embodiments can be appropriately combined and modified.

[0051] In the following drawings, the scale of the dimensions is sometimes expressed differently depending on the structural elements. In addition, in the following embodiments, for ease of explanation, the coordinate axes of the xyz rectangular coordinate system are sometimes shown in each figure. In this case, the direction in which the scattered light simulating the sky is mainly emitted from the light emitting body during the lighting function, that is, the main emission direction is set to the -y axis direction. In addition, the direction that is closer to the traveling direction of the light incident on the light emitting body among the directions perpendicular to the main emission direction is set to the z axis direction.

[0052] Here, the main emission direction may also be referred to as the normal direction of the main light-emitting surface of the light-emitting body. The main light-emitting surface refers to a specific surface among the emission surfaces of the light-emitting body. More specifically, the main light-emitting surface is the surface of the light-emitting body that emits the illumination light, that is, the emission surface, which is particularly desired to be seen by the user as a light-emitting surface that simulates the sky. For example, if the light-emitting body is in the shape of a plate, the main light-emitting surface is one of the two surfaces connected by the side surface. Here, the plate shape is a shape having two surfaces connected by the side surface. In addition, for example, if the light-emitting body is in the shape of a rod, the main light-emitting surface is one or a part of the side surface of the cylinder. Here, the rod shape is a cylindrical shape connecting two bottom surfaces by the side surface. In addition, rod is a general term for cylinders. In addition, for example, when set as a window, the main light-emitting surface is a surface whose normal direction faces the room. In addition, the main light-emitting surface is not limited to a flat surface, for example, it may also be curved, or include one or more inclined surfaces. In this case, the normal direction of the main light-emitting surface may also be the normal direction of the center or the normal direction of the tangent plane.

[0053] Implementation Method 1

[0054] First, Embodiment 1 will be described with reference to the drawings.

[0055] <Structure of lighting device 200>

[0056] Figure 1 and Figure 2 2 is a structural diagram showing a schematic structure of the lighting device 200 according to the present embodiment. Figure 1 is a perspective view showing a schematic structure of the lighting device 200. Figure 2 2 is a cross-sectional view showing a schematic structure of the lighting device 200. In addition, the lighting device 200 of the present embodiment is also referred to as a window 200 with a lighting function.

[0057] The lighting device 200 includes a light source 10, a diffuser 20 as a light emitting body, and a housing 300. Hereinafter, the diffuser 20 and one or more light sources 10 provided in pair with the diffuser 20 are sometimes collectively referred to as a lighting unit 100. That is, the lighting unit 100 is a structure in which the light source 10 and the diffuser 20 are paired.

[0058] For ease of explanation, the y-axis direction is set as the thickness direction (up and down direction) of the diffuser 20, the z-axis direction is set as the horizontal direction (left and right direction), and the x-axis direction is set as the longitudinal direction (front and back direction). However, the above directions are not necessarily consistent with the directions in the actual setting state.

[0059] exist Figure 2 In the example shown, the main light-emitting surface is the surface f22. In this example, when the lighting function is used, the light from the light source 10 is incident on the end of the surface f22 of the diffuser 20 in the +z-axis direction, and the scattered light generated by the scattering effect of the diffuser 20 is emitted from the surface f22. Therefore, the diffuser 20 is regarded as a light-emitting body that emits light close to the natural sky. In addition, the main light-emitting surface can also be a partial area of ​​the surface f22. In addition, the main light-emitting surface can also be formed on the surface f22. In addition, Figure 1 Reference numeral 33 indicates an opening on the back side corresponding to a region 301 on the surface f22 of the diffuser 20 where a main light emitting surface is formed.

[0060] In the following, the light emitted by the light source 10 is sometimes referred to as the first light or the light Li. The scattered light simulating the sky emitted from the diffuser 20 is sometimes referred to as the light Ls, the scattered light Ls, or the diffused light Ls. In addition, in the following, the light guided in the diffuser 20 is sometimes referred to as the light Lt or the propagated light Lt.

[0061] As will be described later, the light Ls may be emitted from not only one emission surface in the diffuser 20. For example, the light Ls may be emitted from a surface f23 on the opposite side of the surface f22.

[0062] <<Light Source 10>>

[0063] Figure 3 : is a structural diagram showing a schematic structure of a light source according to Embodiment 1. Figure 4 FIG. 1 is a structural diagram showing an example of the configuration of the light source of Embodiment 1. The light source 10 may be, for example, an LED light source. Figure 3 As shown, the light source 10 may also include a substrate 12 and an LED element 13. Figure 3 In the example shown, there are a plurality of LED elements 13. Furthermore, the LED elements 13 are arranged on a substrate 12. Here, the LED element is an example of a light emitting element.

[0064] The light source 10 is disposed opposite to the end face of the end portion of the surface f22 forming the main light emitting surface of the diffuser 20. For example, the light source 10 has a light emitting surface f11 that emits light Li that becomes incident light for the diffuser 20, and the light emitting surface f11 is disposed opposite to the end face of the end portion of the surface f22 forming the main light emitting surface of the diffuser 20.

[0065] like Figure 4As shown, the lighting device 200 may also include a plurality of light sources 10 for one diffuser 20. Here, the unit of the light source 10 is a unit that can independently perform on / off control, light emission control, or light emission color control. In addition, the lighting device 200 may also be configured such that, as a lighting unit 100, only one light source 10 is included for one diffuser 20.

[0066] In the following, a group of light sources 10 (including one light source) that emit incident light that generates the sky-simulating light Ls for one diffuser 20 is sometimes collectively referred to as a light source unit 10'. In addition, in the following, a light source unit 10' is sometimes used as a subject to explain the function of the light source 10 constituting the lighting unit 100, but the function can also be regarded as the function of each light source 10 included in the lighting unit 100, and can also be regarded as the function of the combination of the light sources 10 included in the lighting unit 100.

[0067] As an example, in Figure 3 In the example of the structure of the light source 10 shown in the figure, the light source 10 in the figure can also be regarded as the light source unit 10', and each LED element 13 in the figure can be regarded as the light source 10. In addition, in this case, it does not prevent one light source 10 from being Figure 3 The structure of the light source 10 shown. Figure 4 In the illustrated arrangement example of the light sources 10 , the light source unit 10 ′ in the figure may be regarded as one light source 10 , and each light source 10 included in the light source unit 10 ′ in the figure may be regarded as an LED element 13 .

[0068] The light source unit 10' emits light Li, which is incident light to the diffuser 20. The light source unit 10' emits, for example, white light as the light Li. Alternatively, the light source unit 10' may emit, for example, light of a predetermined correlated color temperature Tci as the light Li.

[0069] The correlated color temperature Tci is, for example, 6500 K. Alternatively, the correlated color temperature Tci is, for example, 5000 K. The correlated color temperatures of the lights emitted by the light sources 10 may be the same or different.

[0070] The color of the light Li emitted from the light source 10 may also be a color other than white. For example, the light source 10 may include a white light source and a green light source. In addition, the light source 10 may include a white light source, a green light source, and an orange light source. In addition, the light source 10 may include white light sources of different color temperatures.

[0071] Here, the difference in color temperature between white with a high color temperature and white with a low color temperature is, for example, 8800 K. The correlated color temperature of white with a high color temperature is, for example, 14400 K. The correlated color temperature of white with a high color temperature is, for example, 11500 K or more. In addition, the correlated color temperature of white with a high color temperature is, for example, 19000 K or less. The correlated color temperature of white with a low color temperature is, for example, 5600 K. The correlated color temperature of white with a low color temperature is, for example, 5500 K or more. In addition, the correlated color temperature of white with a low color temperature is, for example, 6050 K or less.

[0072] In addition, the light source 10 Figure 4 In addition to being arranged opposite to one end face constituting the end of the surface f22 having the main light-emitting surface, it may also be arranged opposite to two or more end faces constituting the end. In this case, as long as it functions as a light source for incident light Li from the end of one diffuser 20, it is regarded as the light source 10 of the present embodiment, that is, the light source 10 of the light source unit 10' constituting the diffuser 20.

[0073] For example, the light source 10 (more specifically, its light emitting surface f11) may be arranged opposite to at least one of the end surfaces of the end of the surface f22 forming the main light emitting surface of the diffuser 20. In addition, for example, a plurality of light sources 10 may be arranged along at least one of the end surfaces of the end of the surface f22 forming the main light emitting surface of the diffuser 20.

[0074] Figure 5 2 is a perspective view showing an example of the diffuser 20. For example, the diffuser 20 is Figure 5 In the case where the outer peripheral shape of the main surface shown is a rectangular plate shape and has four side surfaces (side surfaces f21a, f21b, f21c, and f21d), the light source 10 may be arranged as follows.

[0075] As an example, the light source 10 may be arranged opposite to the side f21a of the diffuser 20. In this case, a plurality of light sources 10 may be arranged along the side (side f21a) of the diffuser 20. In addition, as an example, the light source 10 may be arranged opposite to the side f21a and side f21b of the diffuser 20. In this case, a plurality of light sources 10 may be arranged along the side (side f21a and side f21b) of the diffuser 20. In addition, as an example, the light source 10 may be arranged opposite to the side f21a, side f21b, and side f21c of the diffuser 20. In this case, a plurality of light sources 10 may be arranged along the side (side f21a, side f21b, and side f21c of the diffuser 20) of the diffuser 20. In addition, as an example, the light source 10 may be arranged opposite to the side f21a, side f21b, side f21c, and side f21d of the diffuser 20. In this case, a plurality of light sources 10 may be arranged along the side surfaces (the side surface f21a, the side surface f21b, the side surface f21c, and the side surface f21d) of the diffuser 20.

[0076] In addition, as an example, the light source 10 may be arranged opposite to at least any one of the side f21a, side f21b, side f21c, and side f21d of the diffuser 20. In this case, a plurality of light sources 10 may be arranged along the side of the diffuser 20 (at least any one of the side f21a, side f21b, side f21c, and side f21d).

[0077] In addition, the shape of the diffuser 20 is not limited to a plate shape whose outer peripheral shape of the main surface is a rectangular shape. When the shape of the diffuser 20 is other shapes, for example, the positional relationship between the end face and the light source may be applied to a certain end face by replacing it with another end face opposite to it or another end face adjacent to it. Or, for example, the positional relationship between the end face and the light source may be applied to a certain partial area of ​​the connected side surface by replacing it with another partial area located at a position opposite to it or another partial area located at an adjacent position.

[0078] In addition, for example, considering ZEB (Zero Energy Building), light obtained by guiding external light (sunlight, etc.) can also be used instead of the light Li from the light source 10. In guiding the external light, a lighting component or a light guide that takes in the external light and emits it in a specified direction can be used. In this case, as the light source 10, the lighting unit 100 can also have such a lighting component or a light guide.

[0079] <<Diffuser 20>>

[0080] Next, refer to Figure 2 , Figure 5 and Figure 6The diffuser 20 will be described.

[0081] The diffuser 20 has a first surface (surface f22 in the figure) forming a main light-emitting surface, and an end surface (surface f21 in the figure) constituting an end of the first surface. The diffuser 20 may also have a second surface (surface f23 in the figure) on the opposite side of the first surface. The main light-emitting surface may be a partial area of ​​the first surface. In addition, the main light-emitting surface may be formed on the first surface. The incident surface is formed on the end surface. The incident surface may be a partial area of ​​the end surface. In addition, the incident surface may be formed on the end surface. In the following, the first surface is sometimes referred to as the front surface f22, and the second surface on the opposite side thereof is referred to as the back surface f23. In addition, the end surface is sometimes referred to as the side surface f21.

[0082] Figure 6 1 is an explanatory diagram showing an example of light guiding of light Li in the diffuser 20 and an example of light generation of light Ls. The diffuser 20 is incident with light Li emitted by the light source 10. In addition, the diffuser 20 guides the incident light Li. In addition, the diffuser 20 guides the incident light Li as light Lt. Here, "guiding" means that light incident into a certain medium is propagated along a prescribed optical path in the medium. Therefore, the light Lt does not include light scattered or absorbed in the diffuser 20.

[0083] More specifically, the diffuser 20 allows the light Li emitted from the light source 10 to enter from the side surface f21 , guides the light inside as the light Lt, and scatters a part of the light so that the light is emitted from at least the front surface f22 as the simulated sky light Ls.

[0084] The diffuser 20 includes a substrate 201 and particles 202 .

[0085] The particle 202 is, for example, a nanoparticle. A "nanoparticle" is a particle having a size of the nanometer (nm) order. Generally, a nanoparticle refers to a particle having a size of 1 nm to several hundred nm. The particle 202 is, for example, a particle having a particle diameter of the nanometer order.

[0086] Particles 202 may be spherical or in other shapes.

[0087] The diffuser 20 may include multiple types of particles 202 . In this case, the particle size of the particles 202 may be an average particle size. In addition, the diffuser 20 may include particles other than nanoparticles as one of the multiple types of particles 202 .

[0088] The particles 202 are, for example, inorganic oxides, such as ZnO, TiO2, ZrO2, SiO2, Al2O3, and the like.

[0089] The particles 202 scatter the light Li incident on the diffuser 20 to convert it into light Ls. In addition, the particles 202 scatter the light Lt propagating in the diffuser 20 to convert it into light Ls.

[0090] The substrate 201 includes particles 202. The particles 202 may be added to the substrate 201. The particles 202 are dispersed in the substrate 201, for example.

[0091] The substrate 201 is not particularly limited, and may be, for example, a transparent material. The substrate 201 does not necessarily have to be transparent at all wavelengths of the light Li. As an example, the substrate 201 may absorb at a specific wavelength among the wavelengths of the light Li.

[0092] The transmittance (straight transmittance) of the substrate 201 at a light guide distance of 5 mm is preferably 90% or more, more preferably 95% or more, and further preferably 98% or more at the design wavelength. Here, the design wavelength is a predetermined wavelength among the wavelengths of the incident light. The design wavelength is not limited to one wavelength, but may also be multiple wavelengths or wavelengths (bands) with width. For example, in the case where the incident light is white light, the design wavelength may be one or more wavelengths of 450nm, 550nm, and 650nm. In addition, the design wavelength may also be three wavelengths of 450nm, 550nm, and 650nm.

[0093] The substrate 201 is, for example, a solid. The substrate 201 may be, for example, a resin plate using a thermoplastic polymer, a thermosetting resin, or a photopolymerizable resin. In addition, as the resin plate, acrylic polymers, olefin polymers, vinyl polymers, cellulose polymers, amide polymers, fluorine polymers, urethane polymers, silicone polymers, imide polymers, etc. may be used. For example, the particles 202 may be dispersed in the material of the substrate 201 before curing, and then the curing treatment may be performed to form the diffuser 20. In addition, the substrate 201 is not limited to a solid, and may be a liquid or a liquid crystal.

[0094] In addition, the diffuser 20 may also be coated with a light-transmitting functional coating such as an anti-reflection coating, an anti-fouling coating, a heat-insulating coating, or a hydrophobic coating on at least one surface. In addition, considering the functionality as a window (impact resistance, water resistance, heat resistance, etc.), the diffuser 20 may also be a structure sandwiched by two transparent substrates (e.g., glass plates). In this case, the diffuser 20 may also be an intermediate film of laminated glass.

[0095] The diffuser 20 is, for example, in the shape of a plate. In addition, the plate shape is not limited to a flat plate shape. That is, the plate shape may also be a curved shape. For example, the diffuser 20 may also be a shape in which either or both of the front surface f22 and the back surface f23 (the first surface and the second surface) are curved. When the front surface f22 and the back surface f23 are curved, the directions of the curvatures of the two may be consistent or inconsistent. For example, the two surfaces may also be convex (a shape protruding outward) curved surfaces. Furthermore, for example, the two surfaces may also be concave (a shape protruding inward) curved surfaces. Furthermore, for example, one surface may be a convex curved surface and the other surface may be a concave curved surface. In addition, the diffuser 20 may also include an inclination, a step, a depression, a convex portion, etc. on a portion of the surface. The relationship between the front surface f22 and the back surface f23 described above can also be used as a relationship between opposing side surfaces, for example.

[0096] The diffuser 20 is, for example, in the shape of a rod. The rod shape is not limited to a cylindrical, quadrangular, or triangular prism, or a shape that is rectangular in a cross section parallel to the extension direction of the column, or a shape in which the girth of the column is constant in the height direction. The extension direction of the column is, for example, a shape that sets the bottom surface of the column as Figure 5 In the case of the surface f21a, the z-axis direction. In addition, the rod shape also includes a shape equivalent to the plate shape. In this case, the rod shape whose bottom surface of the column is equivalent to the main surface of the plate shape and whose bottom surface is at least one of the main light-emitting surfaces can also be regarded as the plate shape.

[0097] In the case where the diffuser 20 is in a rod shape, the extension direction of the column is set to the z-axis direction. The axial direction parallel to the main emission direction, that is, the y-axis direction, is set to the normal direction of the side surface of the column. Therefore, the main light-emitting surface becomes a part of the side surface of the column. In addition, the incident surface becomes at least one of the bottom surfaces of the column. In the case where the diffuser 20 is in a rod shape, the area on the side surface of the column where the main light-emitting surface is formed can also be regarded as the first surface. Moreover, the area on the side surface of the column opposite to the first surface can also be regarded as the second surface. In addition, the two bottom surfaces of the column can also be regarded as side surfaces. In addition, the side surface can also include areas other than the first surface or the second surface on the side surface of the column.

[0098] The shape of the diffuser 20 when viewed from above (the shape on the xz plane in the figure, hereinafter referred to as the front shape) is not particularly limited. For example, the front shape of the diffuser 20 may be rectangular, polygonal, circular, bottle-shaped, winding, or other shapes formed by connecting two or more straight lines, connecting two or more arcs, or connecting one or more straight lines and one or more arcs.

[0099] In addition, the shape of the diffuser 20 when viewed from the side (the shape on the xy plane and the shape on the yz plane in the figure, hereinafter referred to as the side shape) is not particularly limited. For example, the side shape of the diffuser 20 may be a rectangular shape, a bottle shape, a winding shape, or other shapes formed by connecting four or more straight lines including two opposing straight lines, or a shape formed by connecting two or more straight lines including two opposing straight lines and two or more arcs, etc.

[0100] Hereinafter, as an example, the diffuser 20 according to the first embodiment will be described as being in a plate shape.

[0101] The light Li emitted from the light source 10 is incident on the side surface f21 (end surface). The side surface f21 is arranged to face the light emitting surface f11 of the light source 10, for example.

[0102] The front surface f22 (first surface) emits light Ls scattered by the particles 202. In addition, the front surface f22 may also emit light Lt guided in the diffuser 20. For example, the front surface f22 may also emit light guided in the diffuser 20 and reaching the end opposite to the incident surface as light reproducing sunlight.

[0103] In addition, the back side f23 (second surface) may also emit light Ls scattered by the particles 202. In addition, the back side f23 may also emit light Lt guided within the diffuser 20. For example, the back side f23 may also emit light guided within the diffuser 20 and reaching the end opposite to the incident surface to the outside for the purpose of preventing stray light.

[0104] The back surface f23 faces the front surface f22. The light Lt incident on the diffuser 20 is reflected and guided by the front surface f22 and the back surface f23. The light Lt is guided by, for example, total reflection. For example, the light Lt is guided inside the diffuser 20.

[0105] In addition, the surface other than the front surface f22 or the back surface f23 may also emit the light Ls scattered by the particles 202. In addition, the surface other than the front surface f22 or the back surface f23 may also emit the light Lt guided in the diffuser 20.

[0106] <<Frame 300>>

[0107] Next, the frame body 300 will be described with reference to the drawings.

[0108] The frame 300 supports at least the diffuser 20. The frame 300 may be a structure that supports the diffuser 20 by sandwiching the end portions of the diffuser 20 or covering a part of the end portions of the diffuser 20, for example.

[0109] In addition, the frame 300 may be a structure that supports the light source 10 in addition to the diffuser 20. For example, the frame 300 may be a structure that supports the diffuser 20 by clamping the end of the diffuser 20 or covering a portion of the end of the diffuser 20, and supports the light source 10 by fixing it at a position opposite to the incident surface of the diffuser 20.

[0110] Figure 7 300 is a perspective view showing an example of the frame body 300. Figure 7 In the figure, only the frame 300 is extracted for illustration. Figure 7 (a) is a stereoscopic view viewed from the +y-axis direction side. Figure 7 (b) is a stereoscopic view observed from the -y axis direction side. In the frame 300, the main emission direction of the diffuser 20 as a supporting object is also set to the -y axis direction. In addition, the direction perpendicular to the main emission direction and closer to the traveling direction of the light incident on the diffuser 20 is set to the z axis direction. Figure 8 yes Figure 7 A cross-sectional view of the frame 300 is shown. Figure 8 It is a yz cross-sectional view of the central portion of the frame body 300 in the x-axis direction.

[0111] The frame 300 may include, for example, a first frame portion and a second frame portion that are separable from each other. For example, the frame 300 may include a frame portion 31 as a first frame portion that supports the diffuser 20 and a frame portion 32 as a second frame portion that supports the light source 10, and the diffuser 20 and the light source 10 are supported by the frame portion 31 and the frame portion 32, respectively, in such a manner that their positions are fixed. The frame portion 31 is, for example, disposed at an end portion of the diffuser 20 other than an end portion where an incident surface is formed. In addition, the frame portion 32 is, for example, disposed at an end portion of the diffuser 20 where an incident surface is formed. The frame portion 32 is, for example, disposed so that the light emitting surface f11 of the light source 10 is opposite to the incident surface of the diffuser 20 when supported by the frame portion 31.

[0112] The frame 31 is configured so that, in the assembled state, at least a predetermined area on the first surface of the diffuser 20 including at least a portion of the main light-emitting surface and an area on the second surface opposite thereto (hereinafter collectively referred to as "window area" 301) can be opened. Here, being able to be opened means that it is opened in at least one state of the lighting device in use.

[0113] like Figure 7As shown, the frame 300 may also have a first surface (surface f31 in the figure) and a second surface (surface f32 in the figure) opposite thereto in the assembled state, and both the first surface and the second surface have an opening 33 corresponding to the window area 301 of the diffuser 20. For example, the frame portion 31 is configured to support the end surface of the diffuser 20, or the area outside the window area 301 of the first surface and the second surface. Here, the first surface is a surface facing the main emission direction of the diffuser 20. The second surface is a surface on the side opposite to the first surface.

[0114] In addition, the opening 33 may include an area other than the window area 301. In other words, the opening 33 may not correspond to the window area 301 one-to-one, and may at least include the window area 301. In addition, when the end surface of the diffuser 20 is inclined, the positions and sizes of the opening 33 on the first surface and the opening 33 on the second surface may not be consistent when viewed from above.

[0115] In addition, the frame 300 has an inner side surface f34 and an outer side surface f33. In addition, the inner side surface f34 is formed with a groove portion 35 and a groove portion 36 (see Figure 8 The diffuser 20 and the light source 10 are supported by, for example, a groove 35 and a groove 36 formed on the inner side surface f34 of the frame body 300.

[0116] The frame portion 31 may also have an inner side surface f34, on which a groove portion 35 is formed for accommodating the end of the diffuser 20 when the window area 301 of the diffuser 20 is opened. The groove portion 35 may also be in contact with at least one of the end surface (side surface f21), the first surface (front surface f22) and the second surface (back surface f23) of the diffuser 20 to support the diffuser 20. The gap between the diffuser 20 and the groove portion 35 may also be filled with a buffer material. The gap between the diffuser 20 and the groove portion 35 may also be filled with a gasket covering the end of the diffuser 20, for example. Preferably, the gasket is not colored. The gap between the diffuser 20 and the groove portion 35 may also be filled with a sealing material or a supporting material, for example.

[0117] In addition, the inner side surface f34 of the frame portion 31 may include an inner side surface f34A defining the window region 301 on the first surface of the diffuser 20 and an inner side surface f34B defining the window region 301 on the second surface of the diffuser 20 (see Figure 8 ). The groove portion 35 only needs to be able to support the diffuser 20, and the cross-sectional shape may be, for example, a U-shape or an L-shape. For example, the groove portion 35 may be a shape that opens the surface (surface f23) of the diffuser 20 in the +y-axis direction, or may be a shape that opens the surface (surface f22) of the diffuser 20 in the -y-axis direction. In addition, the groove portion 35 may have a step or an inclination on the bottom surface f351 or the side surface f352.

[0118] The frame portion 32 may also have an inner side surface f34, on which a groove portion 36 is formed to accommodate the light source 10 while at least the light emitting surface f11 of the light source 10 is opened. The groove portion 36 may also be in contact with at least one of the side surfaces and the bottom surface of the light source 10 or the substrate 12 or the light source unit 10' to support the light source 10.

[0119] In addition, the inner side surface f34 of the frame portion 32 may also include an inner side surface f34A that defines the window area 301 on the first surface of the diffuser 20, and an inner side surface f34B that defines the window area 301 on the second surface of the diffuser 20.

[0120] In addition, the groove portion 36 may also have a bottom surface f361. The light source 10 is, for example, disposed on the bottom surface f361 of the groove portion 36. The light source 10 may also be disposed on the bottom surface f361 via a thermally conductive material such as thermally conductive grease or a metal plate.

[0121] In addition, the shape of the groove 36 is not particularly limited as long as it can support the light source 10. For example, the cross-sectional shape of the groove 36 may be, for example, a U-shape or an L-shape. For example, the L-shaped groove 36 may be a shape that opens the surface of the light source 10 in the +y-axis direction or a shape that opens the surface of the light source 10 in the -y-axis direction.

[0122] In addition, the groove portion 36 may be configured to support the end portion of the diffuser 20 where the incident surface is formed while supporting the light source 10. For example, the frame portion 32 may support the diffuser 20 by contacting a portion of the side surface f362 of the groove portion 36 with at least one of the end surface of the end portion where the incident surface is formed, the first surface, and the second surface. For example, the groove portion 36 may have a step on the side surface f362 to support such a diffuser 20. In addition, similar to the groove portion 35, the gap between the diffuser 20 and the side surface supporting the diffuser 20 may be filled, for example, by a gasket covering the end portion of the diffuser 20.

[0123] Fig. 9 3 is a cross-sectional view showing another example of the frame body 300. Fig. 9 In the figure, only the frame portion 32 of the frame body 300, which is provided at the end of the diffuser 20 where the incident surface is formed, is shown. The groove portion 36 of the frame portion 32 may also have an inclined or curved surface on the side surface f362. Fig. 9 The example shown is an example in which a portion of the side surface f362 of the groove portion 36 is inclined. A portion of the side surface of the groove portion 36 (but in addition to supporting a portion of the diffuser 20) can also form a reflecting surface or a focusing cone for concentrating the light Li from the light source 10 on the incident surface of the diffuser 20.

[0124] In addition, in the frame 300, the frame portion 31 and the frame portion 32 may be formed integrally or independently. In the case where it is desired to set the light source 10 at multiple ends of the diffuser 20, the frame 300 may include one or more frame portions 32 corresponding to the ends of the diffuser 20 where the light source 10 is set.

[0125] In the case where the frame 31 and the frame 32 are independently formed, the frame 300 may be configured such that the frame 32 supporting the light source 10 can be detached relative to the frame 31 supporting the diffuser 20. In addition, the frame 300 may be configured such that the positions of the frame 31 supporting the diffuser 20 and the frame 32 supporting the light source can be changed, like a window sash and a window frame of an openable window. In this case, the frame 31 and the frame 32 support the diffuser 20 and the light source 10 in at least one use state so that the light source 10 is arranged at the end of the diffuser 20.

[0126] Fig.10 3 is a cross-sectional view showing another example of the frame body 300. Fig.10 In FIG. 3 , only the frame portion 31 and the frame portion 32 provided at the end portion of the diffuser 20 where the incident surface is formed are shown in the frame body 300 . Fig.10 In the example shown, the frame portion 31 and the frame portion 32 are formed independently. Fig.10 In the example shown, the frame portion 31 is also provided at the end portion of the diffuser 20 where the incident surface is formed. In the frame portion 31 provided at the end portion of the diffuser 20 where the incident surface is formed, the bottom surface f351 of the groove portion 35 provided on the inner side surface f34 is open. That is, the groove portion 35 of the frame portion 31 may also have an opening 37 at the bottom. The opening 37 is provided, for example, at a position opposite to the area of ​​the diffuser 20 where the incident surface is formed. In this case, the light source 10 supported by the frame portion 32 causes the light Li to be incident on the diffuser 20 via the opening 37 of the frame portion 31. In addition, in Fig.10 , an example in which the distance between the frame 31 and the frame 32 can be changed in the z-axis direction is shown, but the frame 300 may fix the frame 31 and the frame 32 in a state where the frame 31 and the frame 32 are in contact. In addition, only the frame 31 may be used as the frame 300 of the window with lighting function or the first window building material. In this case, the frame 32 may be treated as the frame of the second window building material corresponding to the window with lighting function or the first window building material.

[0127] Fig.11 1 is an explanatory diagram showing an installation example of the lighting device 200 including the housing 300 . Fig.11 (a) is a schematic top view showing the lighting device 200 installed on the installation object 40. Fig.11 (b) to (e) are schematic cross-sectional views showing the lighting device 200 installed on the installation object 40. Fig.11As shown in (b) to (e) of FIG. 3 , the frame 300 may also have a joint portion 38 for embedding and fixing the lighting device 200 to the installed body 40. Here, "fixed" means supporting in a non-detachable manner. The joint portion 38 is provided, for example, at the end of the first surface f31 of the frame 300, the end of the second surface f32, or the outer side surface f33.

[0128] The joint portion 38 contacts at least one surface (eg, a side surface, a surface in the −y-axis direction, or a surface in the +y-axis direction) constituting an end portion of an opening provided in the installed body 40 , thereby fixing the lighting device 200 in the opening.

[0129] The joint portion 38 can adopt various shapes according to the usage form of the lighting device 200 .

[0130] For example, when the lighting device 200 is used as a skylight or a daylighting window (so-called FIX window) that is always closed in addition to the lighting function, the frame 300 may also have a joint 38 for fixing the lighting device 200 to a ceiling, a wall, a door, etc. as a mounted body 40 or a window frame mounted thereon. For example, the joint 38 may be a protrusion or a groove having a shape that fits with the shape of the end of the opening in the mounted body 40 in which the lighting device 200 is mounted. In addition, the frame 300 of the lighting device 200 and the part in the mounted body 40 that forms the opening in which the lighting device 200 is mounted may also be integrated.

[0131] Fig.12 and Fig.13 It is an explanatory diagram showing an example of the frame body 300 (particularly, the joint portion 38 ). Fig.12 1 is an explanatory diagram showing another installation example of the lighting device 200 including the housing 300 . Fig.12 (a) is a schematic top view showing the lighting device 200 installed on the installation object 40. Fig.12 (b) is a schematic cross-sectional view showing the lighting device 200 installed on the installation object 40.

[0132] like Fig.12 As shown, for example, when the lighting device 200 is used as a sliding window such as a push-pull window or a lift window that slides and opens in the horizontal or vertical direction in addition to the lighting function, it may also have a joint portion 38 for supporting the lighting device 200 in a manner that allows it to slide in a certain direction on the window frame as the installed body 40. For example, the frame body 300 may also have a protrusion or groove portion of a shape that fits with the shape of a protrusion or groove portion provided on the window frame as the joint portion 38.

[0133] Fig.13 3 is a cross-sectional view showing an example of the frame body 300. Fig.13 , the main part of the frame 300 is shown in an enlarged manner. The frame 300 may also have a groove 39 for accommodating a pulley corresponding to a track provided in the window frame as the joint 38. The groove 39 is provided, for example, on the outer side surface of the frame 300 which becomes the bottom surface when it is provided. In addition, the joint 38 may also include the groove 39 and the pulley (not shown) accommodated in the groove 39.

[0134] In addition, for example, when the lighting device 200 is used as a window that opens and closes around a certain axis such as an outboard window in addition to the lighting function, the frame 300 may also have a friction stay or hinge portion as the joint 38, in which the arm slides according to the opening and closing state.

[0135] The surface of the grooves (e.g., grooves 35, 36, 39, and the grooves serving as the joint 38) of the frame 300 may be a mirror surface. In addition, the surface of the grooves may be, for example, a light absorber. In addition, the surface of the grooves may be, for example, a light diffuser reflector.

[0136] In addition to the above, the lighting device 200 of this embodiment can also be applied to various types of windows such as foldable windows, double-action windows, and foldable windows. Depending on the type of window to be applied, the frame 300 and the joint 38 of the frame 300 can adopt various shapes.

[0137] Fig.14 and Fig.15 300. For example, the frame 300 may be a frame portion of a so-called frame (frame) set door. In this case, the diffuser 20 corresponds to at least one of the mirror plates in the frame set door. For example, the frame 300 may be divided into Fig.14 The four frames shown in FIG. 300 (frame 300a, frame 300b, frame 300c and frame 300d) are shown in FIG. Fig.15 The diffuser 20 shown is divided into two frames (frame 300A and frame 300B) in the thickness direction. In addition, the divisibility of the frame is not limited to the frame assembly door.

[0138] In addition, for example, the frame 300 may also be configured such that, when divided into two or more frames, the first frame (e.g., the frame portion 31) supports the diffuser 20, and the second frame (e.g., the frame portion 32) supports the light source 10. In this case, the first frame and the second frame have a fitting portion (a recess and a protrusion, a rail portion and a pulley, etc.) for fitting with each other. In addition, in this case, the positional relationship between the light source 10 and the diffuser 20 may be set as follows: in at least one state in which the first frame and the second frame are fitted, such as a closed state in an open and closed state, the light source 10 is arranged at a position opposite to the side f21 of the diffuser 20. In this case, the first frame may constitute the window sash portion of the window, and the second frame may constitute the window frame. In addition, the lighting device 200 including the window sash portion and the window frame of the window may also be referred to as a window system 200 or a window building material 200.

[0139] Fig.16 2 is a diagram showing an application example of the lighting device 200. Fig.16 As shown, the lighting device 200 can also be used as a skylight 402 or a window 403 of a building (not shown) or a moving body 400. In this case, the frame 300 can also be formed integrally with the structure of the main body 401 fixed to the moving body 400 such as a vehicle or the main body 401, and the window area 301 of the diffuser 20 of the lighting device 200 can also function as a window of the moving body 400, such as a skylight 402 or a window 403.

[0140] When the lighting device 200 is used as a skylight or window of a mobile body, the diffuser 20 may also have heat insulation. The heat insulation may be obtained by applying a heat insulation coating to at least one of the first surface (surface f22) and the second surface (surface f23) of the diffuser 20, or by adding an additive to the inside of the diffuser 20.

[0141] Fig.17 2 is a schematic structural diagram showing another example of the lighting device 200. Fig.17 As shown, the lighting device 200 may also include a shading plate 50 that physically blocks light, such as a sliding shutter, covering the opening 33 on the first surface side or the second surface side of the diffuser 20. In addition, the shading plate 50 is an example of a shading portion. Thus, the heat insulation of the room or the car is improved. In addition, the shading plate 50 may be further coated with heat insulation.

[0142] In addition, Fig.17 In the example shown, the light shielding plate 50 can be moved in the -z axis direction. Fig.17, an example in which the shading plate 50 is provided on the second surface side of the diffuser 20 is shown, but the shading plate 50 may also be provided on the first surface side. In addition, the shading plate 50 may also be provided on both the first surface side and the second surface side. In addition, when the shading plate 50 is provided on the first surface side, the shading plate 50 is set to an open state when the light source 10 is turned on.

[0143] For example, when the lighting device 200 is used as a window in a vehicle, the sunshade 50 may be provided both between the diffuser 20 and the outside and between the diffuser 20 and the interior of the vehicle, thereby further improving the heat insulation of the vehicle interior.

[0144] In addition, if Fig.18 As shown, when the lighting device 200 has a shading plate 50, the housing 300 may also have a window cover 51 capable of storing the shading plate 50 in an open state.

[0145] In addition to a plate that always blocks light, the light shielding plate 50 may also be a variable transmittance filter that can adjust the amount of light to be transmitted by external control. Examples of this include a component obtained by combining two polarizing plates, and an optical shutter based on liquid crystal, etc., whose transmittance changes according to applied voltage, etc. In this case, one polarizing plate may be rotated, or the voltage applied to the liquid crystal may be controlled, thereby blocking light from the outside as needed.

[0146] In addition, the lighting device 200 can also integrally support the sunshade 50 and the diffuser 20 or form them integrally through a stacked structure. In this case, when the weather has little impact on the interior environment of the vehicle, such as when the amount of sunlight is comfortable on a sunny day, the frame 300 can also accommodate the sunshade 50 and the diffuser 20 in the window cover 51, so that the window area 301 is physically open, so as to visually identify the outside world or an additional sunroof glass, etc. In addition, when the weather has a great impact on the interior environment of the vehicle, such as when the sunlight is too strong, or when the weather is bad, such as when it is rainy or cloudy, the frame 300 can also pull out the sunshade 50 and the diffuser 20 from the window cover, so that the window area 301 is in a closed state. For example, Fig.19 As shown, the frame 300 may also have a window cover 51 capable of accommodating the shading plate 50 and the diffuser 20. In addition, Figures 17 to 19 The illustrated example shows an example in which the light shielding plate 50 and the diffuser 20 move in the z-axis direction, but the moving direction is not limited to the z-axis direction, and may be, for example, the x-axis direction.

[0147] Furthermore, the lighting device 200 can also store the diffuser 20 in the window cover 51 regardless of whether the sunshade 50 is present, and the window area 301 can be physically opened. For example, the lighting device 200 can also be used as an openable and closable skylight provided on a moving body. In this case, when the skylight is in an open state, the diffuser 20 is stored in the window cover 51 of the frame 300. In addition, by pulling out the diffuser 20 stored in the window cover 51 from the window cover 51, the skylight is closed.

[0148] Fig. 20 and Fig.21 : is a diagram showing an example of a form in which the lighting device is used as a skylight. Fig. 20 FIG. 2 shows an example of the lighting device 200 when viewed from the front side (−y axis direction). Fig. 20 As shown in (a) of FIG. 1 , the shading plate 50 as the shading portion may be provided on the front side of the diffuser 20 in a manner that can be opened and closed at least relative to the window region 301. Fig. 20 As shown in (b), the diffuser 20 itself may be provided so as to be openable and closable relative to the opening 33 of the frame 300. The opening 33 in this example corresponds to the window region 301 when the diffuser 20 is in the closed state.

[0149] also, Fig.21 2 is a cross-sectional view showing a schematic configuration example of the lighting device 200 when used as a skylight. Fig.21 In the example shown, the light source 10 is omitted for the purpose of not limiting the moving direction. Fig.21 The example shown in (a) is an example in which the frame 300 supports only the diffuser 20 in the window region 301. The diffuser 20 may be fixed to the frame 300 or supported so as to be openable and closable. Fig.21 The example shown in (b) is an example in which the frame 300 supports the diffuser 20 in the window area 301 and supports the shading plate 50 on the front side. The diffuser 20 can be fixed to the frame 300 or supported so as to be openable and closable. In addition, the shading plate 50 is supported so as to be openable and closable independently of the diffuser 20.

[0150] also, Fig.21 The example shown in (c) is an example in which the frame 300 supports the diffuser 20 in the window area 301 and supports the shading plate 50 on the back side thereof. The diffuser 20 may be fixed to the frame 300, or may be supported so as to be openable and closable. In addition, the shading plate 50 may be supported so as to be openable and closable in conjunction with the diffuser 20, or may be supported so as to be openable and closable independently of the diffuser 20. In addition, Fig.21The example shown in (d) is an example in which the frame 300 supports the diffuser 20 in the window area 301, supports the sunshade 50 on the back side thereof, and further supports the skylight glass 402 on the back side thereof. The skylight glass 402 may be fixed to the frame 300, or may be supported so as to be able to be opened and closed. In addition, the diffuser 20 and the sunshade 50 are supported so as to be able to be opened and closed independently of each other or in conjunction with each other. Fig.21 In each of the examples shown, the frame body 300 may be formed integrally with the main body 401 in addition to the structure in which it is fitted into the opening of the main body 401 of the vehicle.

[0151] In addition, the frame 300 and the frame portion 31 may not surround the entire end surface (side surface f21) of the diffuser 20. For example, the frame 300 and the frame portion 31 may be configured as follows: for example, the front shape is an equal sign shape, a U shape, or a C shape, and a portion (for example, one side) of the end of the first surface and the second surface of the diffuser 20 and the end surface connected to the portion are opened. Thus, for example, when the lighting device 200 is used as an openable skylight, when the diffuser 20 itself is made movable by sliding, it is possible to make it difficult for the user to visually recognize the boundary between the opening area opened by sliding and the diffuser 20.

[0152] The frame body 300 and the frame portion 31 may, for example, be provided only at the end portion corresponding to the corner portion of the diffuser 20, only at the end portion corresponding to two opposite sides, only at the end portion corresponding to two opposite sides and the side connecting the ends of one of the two sides to each other, or only at the end portion of a certain part when viewed from above and the end portion of another part of the area opposite thereto.

[0153] In addition, the frame 300 may also have a power supply for supplying power to the light source 10 inside. In addition, the frame 300 may also have a power receiving module so that non-contact power can be supplied between the frame 300 and the installed body 40. For example, the installed body 40 may have a power transmission module, and the joint 38 may have a power receiving module. In addition, the first frame corresponding to a window frame or the like may have a power transmission module instead of the installed body 40, and the second frame corresponding to the window sash portion that contacts the first frame may have a power receiving module.

[0154] Furthermore, the frame 300 can also be charged by contacting the installed body 40 or by contacting the divided frames with each other. For example, when the lighting device 200 is set as an openable window or door, it can also have a power receiving unit and a power storage unit at the joint 38 of the frame 300, so that it can be charged when the window or door is in a closed state. For example, the power receiving unit obtains power by contacting a power supply unit provided on the inner wall of the door frame of the inner wall of the window frame. The power storage unit stores the power obtained by the power receiving unit. In addition, in the case where the FIX window that is not openable and closable can always receive power, the power storage unit can be omitted.

[0155] Furthermore, the lighting device 200 may include a solar power generation module such as a solar power generation panel on the back surface of the housing 300 so that the light source 10 can be supplied with electric power by external light.

[0156] <Effects of lighting device 200>

[0157] <<Rayleigh scattering>>

[0158] Below, refer to Fig. 22 Rayleigh scattering, which is one of the light scattering phenomena, will be described. Fig. 22 This is a diagram showing an example of the angular distribution of scattered light intensity due to Rayleigh scattering of a single particle 202 according to the first embodiment.

[0159] For example, the light Li emitted from the light source is used to describe the light that collides with the particle 202. In addition, the light that collides with the particle 202 may also be the light Lt guided in the diffuser 20. The longitudinal axis Z is an axis parallel to the traveling direction of the light Li. The light Li travels in the +Z axis direction. The transverse axis X is an axis orthogonal to the longitudinal axis Z.

[0160] When the particle size is smaller than the wavelength of visible light, Rayleigh scattering occurs when light collides with the particle. The wavelength of visible light is, for example, in the range of 380 nm to 780 nm. Specifically, Rayleigh scattering occurs when the size parameter α represented by the particle size d and the wavelength λ of the light satisfies the following formula (1). In addition, in the formula, "·" represents a multiplication operation.

[0161] α<<π·d / λ… (1)

[0162] In Rayleigh scattering, the scattering cross-sectional area σ is a parameter indicating the probability of scattering, and has a relationship with the particle diameter d and the wavelength λ of light as shown in the following equation (2).

[0163] σ∝d 6 / λ 4 … (2)

[0164] According to formula (2), the scattering cross-sectional area σ in Rayleigh scattering is inversely proportional to the fourth power of the wavelength λ of the light. Therefore, in Rayleigh scattering, the shorter the wavelength of light, the higher the probability of being scattered. For example, when light is incident on particles of the same particle size d and refractive index n, the probability of blue light being scattered is higher than that of red light. The wavelength λ of blue light is, for example, 450nm. The wavelength λ of red light is, for example, 650nm.

[0165] exist Fig. 22 The intensity distribution of scattered light without polarization is shown in FIG. The particle size d of the particle is 100 nm. The refractive index n of the particle is 1.43. The refractive index of the substrate is 1.33. The wavelength of the light is 450 nm.

[0166] like Fig. 22 As shown in FIG. 1 , in Rayleigh scattering, scattered light is radiated in all directions. Therefore, even if light enters from the side surface f21 of the diffuser 20 , light can be extracted from the front surface f22 and the back surface f23 perpendicular to the side surface f21 .

[0167] <<Simulating the generation of scattered light from the sky>>

[0168] Below, refer to Figure 6 The principle of generating scattered light that simulates the sky (especially the blue sky) is explained. Figure 6 As shown, light Li emitted from the light source 10 is incident from the side surface f21 of the diffuser 20. The light Li incident from the side surface f21 is guided as light Lt in the diffuser 20. The incident light Lt is reflected at the front surface f22 and the back surface f23.

[0169] When propagating in the diffuser 20, part of the light Lt collides with the particles 202. The light Lt colliding with the particles 202 is scattered in all directions.

[0170] Among the scattered light, the light incident on the front surface f22 at an incident angle below the critical angle is emitted from the front surface f22 as light Ls. The critical angle refers to the minimum incident angle that causes total reflection when light moves from a place with a large refractive index to a place with a small refractive index.

[0171] Among the scattered light, the light that is incident on the back surface f23 at an incident angle equal to or less than the critical angle is emitted from the back surface f23 as light Ls.

[0172] At this time, according to formula (2), in Rayleigh scattering, the shorter the wavelength of light, the higher the probability of being scattered. Therefore, the correlated color temperature Tcs of the scattered light is higher than the correlated color temperature Tci of the incident light. For example, the correlated color temperature Tci is the correlated color temperature of the light Li emitted by the light source 10. For example, the correlated color temperature Tcs is the correlated color temperature of the scattered light Ls.

[0173] When the light Li has a spectrum distribution in the entire region of visible light, blue light is preferentially scattered. The light Li is, for example, white light. The light source 10 has, for example, a white LED. Therefore, by appropriately designing the light source 10 and the diffuser 20, the light Ls becomes a correlated color temperature showing blue that is close to the color of the actual sky.

[0174] In addition, the amount of scattered light Ls depends on the amount of incident light Li, and therefore, by appropriately selecting the amount of light of the light source to be used, the lighting device has sufficient brightness and can reproduce the color of the sky. In addition, the length of the light guide path of the incident light in the diffuser 20 is independent of the thickness direction, and therefore, the thickness of the diffuser 20 (the length in the main emission direction) can be reduced. For example, according to the structure of the present embodiment, the thickness of the diffuser 20 can be made less than 100 mm. In addition, for example, the thickness of the diffuser 20 can also be less than 20 mm, and can also be less than 10 mm. Furthermore, for example, the thickness of the diffuser 20 can also be less than 5 mm.

[0175] <<Window Function of Lighting Device 200>>

[0176] In the lighting device 200, the light source 10 is arranged on the side f21 of the diffuser 20, and the light Li emitted from the light source 10 is guided in the diffuser 20, collides with the particles 202 dispersed in the diffuser 20, and is Rayleigh scattered, and then emitted from the diffuser 20. In the case of realizing a lighting device that simulates the sky in a thin shape, it is effective to make the light incident from the end of the diffuser 20 that produces Rayleigh scattering. However, in this structure, during the period when the light is guided, the light with a higher correlated color temperature is scattered preferentially. Therefore, as the light guiding distance is extended, the correlated color temperature of the scattered light becomes lower. This is because, when the light guiding distance is extended, the number of scatterings of the light based on the nanoparticles increases. That is, as the light is guided, the color of the scattered light changes from blue to red. As a result, color unevenness may occur on the exit surface of the diffuser 20.

[0177] In order to reproduce the sky, it is necessary to scatter the blue wavelength light in the light incident from the light source 10 during illumination at an appropriate ratio relative to the light of other wavelengths. On the other hand, in order to avoid uneven brightness or uneven color caused by scattered light Ls in the front surface f22 or the back surface f23 of the diffuser 20, it is necessary to reduce the added concentration of particles 202 dispersed in the diffuser 20. In addition, when considering using the lighting device 200 as a window for visual recognition of the opposite side space, it is preferred that there is no coloring caused by Rayleigh scattering for the ambient light incident from the back side when the light source is not lit. In addition, there is no such restriction when used as a window for lighting.

[0178] In the lighting device 200 of the present embodiment, attention is paid to the haze value of the diffuser 20 .

[0179] In a method of projecting light from a light source from the back side of the diffuser 20 as in the lighting system described in Patent Document 1, sufficient scattering needs to occur within a relatively short light guide distance corresponding to the thickness of the diffuser 20. Therefore, when comparing a method of arranging a light source at the end of the diffuser 20 as in the present embodiment with the method described in Patent Document 1, when the outer shape of the diffuser 20 and the refractive index ratio of the base material and the particles are similar, the method of the present embodiment can reduce the concentration of the particles added to the diffuser 20, and as a result, can reduce the haze in the thickness direction of the diffuser 20.

[0180] The haze value is an index related to transparency and is calculated based on the ratio of diffused transmitted light to the total light transmitted. The haze value in the thickness direction refers to the ratio of diffused transmitted light emitted from the front side f22 (or back side f23) to the total light transmitted when white light is incident from the back side f23 (or front side f22) of the diffuser 20.

[0181] The haze value in the thickness direction of the diffuser 20 is within the range of 0.005% to 30%, more preferably within the range of 0.1% to 15%, and further preferably within the range of 0.5% to 5%. By suppressing the haze of the diffuser 20 within this range, when the light source 10 is not lit, the diffuser 20 has sufficient transparency or light transmittance as a window, and when the light source 10 is lit, the diffuser 20 can reduce color unevenness or brightness unevenness as a lighting fixture, and obtain sufficient sky color reproducibility.

[0182] In this way, the lighting device 200 can simultaneously realize the function of a lighting fixture that simulates the natural sky and the function of a window.

[0183] The lighting device 200, for example, turns off the light source 10 on a sunny day, thereby, for example, being able to function as a window for taking in external light into the room. In addition, the lighting device 200, for example, turns on the light source 10 on a rainy day or a cloudy day, thereby being able to function as a lighting device that simulates the natural sky. In this way, a sense of openness on a sunny day can be provided to the room independently of the weather. At this time, by utilizing external light incident on the diffuser 20 from the back side, for example, the brightness of the lighting function can be supplemented, or sunlight (direct sunlight) can be visually recognized.

[0184] Furthermore, for example, when sunlight is strong, a shading function such as an external blind or shading portion not shown in the figure is set on the back side of the diffuser 20, so that the light source 10 is turned on. This can suppress the discomfort caused by the glare of sunlight and provide a sense of openness of the natural sky.

[0185] In addition, according to the lighting device 200, not only is a sense of openness of the natural sky provided regardless of the weather, but the lighting state and the non-lighting state are switched according to user operations. Thus, when the user wishes to visually identify the opposite side space, the light source can be turned off and the opposite side space can be visually identified through the diffuser 20.

[0186] Furthermore, if the diffuser 20 itself of the lighting device 200 is made into a sliding type, it is possible to realize both the function of a lighting fixture that simulates the natural sky and the function of an openable window.

[0187] For example, when the lighting device 200 is used as a sunroof or window of a mobile body, the light source 10 is turned off on a sunny day, thereby allowing natural light to be taken into the vehicle and allowing the conditions outside the vehicle, such as the actual sky, to be observed. On rainy or cloudy days, the light source 10 is turned on, thereby functioning as a lighting device that simulates the natural sky, and the user of the mobile body can enjoy the sense of openness of the natural sky regardless of the weather.

[0188] In addition, when there is a shading function such as an external switch or a shading part between the diffuser 20 and the outside to improve the heat insulation inside the vehicle, when it is desired to suppress the temperature rise inside the vehicle due to weather such as daytime with strong sunlight, the shading function is turned off (covering the window area), and the light source 10 is turned on, thereby simulating the natural sky, which can suppress the temperature rise inside the vehicle and make the openness of the natural sky feel.

[0189] Furthermore, when there is a shading function such as an external switch or a shading portion between the diffuser 20 and the interior of the mobile body to improve the heat insulation of the vehicle interior, the shading function is appropriately turned on (the window area is open) and the light source 10 is turned on, thereby simulating the natural sky. Therefore, the user of the mobile body can feel the openness of the natural sky regardless of the weather.

[0190] Furthermore, when the sunroof glass of the mobile body and the diffuser 20 have a shading function such as an external shutter or a shading part to improve the heat insulation inside the vehicle, when it is desired to suppress the temperature rise inside the vehicle due to the daytime with strong sunlight, the shading function and the diffuser 20 are turned off (covering the window area), and the light source 10 is turned on, thereby simulating the natural sky. In addition, on rainy days or cloudy days, at least the diffuser 20 is turned off, and the light source 10 is turned on, thereby simulating the natural sky. In addition, on sunny days, if it is a daytime with weak sunlight, the shading function and the diffuser 20 are turned on, and the natural sky can be enjoyed through the sunroof glass.

[0191] Furthermore, when the lighting device 200 is used as an openable skylight installed on a mobile body, the diffuser 20 serving as the window of the skylight is closed and the light source 10 is lit, thereby simulating the natural sky. Users of the mobile body can enjoy the sense of openness of the natural sky regardless of the weather.

[0192] <<Day and night effect based on the color change of light source>>

[0193] As already described, the lighting device 200 can include a plurality of light sources 10 emitting light of different colors.

[0194] For example, the lighting device 200 may control each light source 10 so that the correlated color temperature (Tci) of the light Li changes dynamically. Thus, the correlated color temperature (Tcs) of the light Ls can be changed dynamically. In addition, for example, the lighting device 200 may control each light source 10 so that the light amount of the light Li changes dynamically. Thus, the light amount of the light Ls can be changed dynamically.

[0195] By changing the correlated color temperature and light quantity of the light Li incident on the diffuser 20 in this way, an observer who sees the light Ls can feel that the color of the sky changes over time. In addition, a circadian rhythm can be generated.

[0196] "Circadian rhythm" is a physiological phenomenon that changes in a 24-hour cycle. It exists in most organisms such as animals and plants. It is also commonly called "biological clock". In a strict sense, circadian rhythm is formed internally. However, it is modified by external stimuli such as light, temperature or food.

[0197] As described above, the lighting device 200 has light transmittance that can be used as a window or visual recognition of the opposite side space when the light source 10 is not lit, and has sufficient brightness as a lighting fixture when the light source 10 is lit, and can reproduce the color of the sky. Thus, it is possible to realize the lighting device 200 that functions as a window when the light source 10 is not lit and functions as a lighting fixture that simulates the natural sky when the light source 10 is lit.

[0198] <Modification 1>

[0199] Next, a description will be given of Modification 1 of the lighting device according to Embodiment 1. Hereinafter, the same reference numerals are given to the same components as those of the lighting device 200 , and the description thereof will be omitted.

[0200] Fig.23 1 is a cross-sectional view showing an example of the structure of a lighting device 210 according to Modification 1. The lighting device 210 includes a rear plate 52 in addition to the light source 10 , the diffuser 20 , and the frame 300 .

[0201] The back panel 52 is arranged on the back side of the diffuser 20. The back panel 52 can also be arranged opposite to the back side f23 of the diffuser 20. Other functional panels can also be arranged between the back panel 52 and the diffuser 20, but the panel can be opened and closed. In addition, it is preferred that the distance between the back panel 52 and the diffuser 20 is closer. In addition, the back panel 52 can be arranged as a modified example of the above-mentioned shading plate 50, or it can be arranged separately from the above-mentioned shading plate 50.

[0202] The back plate 52 is opaque, and the transmittance is preferably 50% or less, and more preferably 10% or less.

[0203] The back plate 52 is preferably a diffuse reflector, more preferably a white diffuse reflector. The back plate 52 may also be a light absorber.

[0204] The open and closed state of the back panel 52 can be changed. The back panel 52 can also be changed in the open and closed state according to the folded state of the back panel 52 or the storage state of the back panel 52 stored in the window cover, such as a blind or a shutter. In addition, the back panel 52 can also be changed in the open and closed state according to the storage state of the back panel 52 stored in the window cover of the opening where the lighting device 210 is set, such as a rainproof window cover.

[0205] Back plate 52 may be configured, for example, like a liquid crystal shutter, and its shielding state may be changed by a voltage applied to back plate 52. Back plate 52 may be configured, for example, like a liquid crystal panel, and its shielding state may be changed by a voltage applied to back plate 52.

[0206] The frame 300 may also have a space inside for storing the back panel 52. In the closed state, the back panel 52 is stored inside the frame 300, and in the open state, the back panel 52 is exposed to the outside of the frame. Furthermore, the back panel 52 may be replaced by a shutter provided for the opening where the lighting device 210 is provided. For example, in the case of using it as a sunroof of a mobile body, the back panel 52 may be replaced by a shutter provided on the vehicle body.

[0207] In addition, the rear panel 52 may be supported in the frame 300 integrally with the diffuser 20. That is, the rear panel 52 may be supported integrally with the diffuser 20 so as to be openable and closable.

[0208] <<Effect of the rear panel 52>>

[0209] When the light source 10 is turned on, the scattered light Ls is emitted not only from the front side f22 of the diffuser 20, but also from the back side f23. For example, in a wall where the lighting device 210 is installed, in a space divided by the wall, if the front side f22 faces the side where the observer is located (hereinafter referred to as the inner side), the scattered light Ls emitted from the back side f23 to the back side f23 side (hereinafter referred to as the outer side) is not visually recognized by the observer and becomes a loss. In addition, the scattered light Ls emitted to the outside may also cause optical damage to people other than the observer who are located on the outside.

[0210] By arranging the back panel 52 on the back side f23 of the diffuser 20, it is possible to prevent the scattered light Ls emitted from the back side f23 of the diffuser 20 from being emitted outward when the light source 10 is turned on. Furthermore, by using a component that reflects the scattered light Ls emitted from the back side f23, such as a diffuse reflector, as the back panel 52, the scattered light Ls emitted from the back side f23 can be emitted from the front side f22, and the light utilization efficiency of the lighting device 210 as a lighting fixture can be improved.

[0211] In this way, by setting the back panel 52 that can change the open and closed state on the back side of the diffuser 20, the following lighting device 210 can be realized: when the back panel 52 is in the open state, it has the same function as the lighting device 200, and when the back panel 52 is in the closed state, light damage is suppressed and light utilization efficiency is improved.

[0212] <Modification 2>

[0213] Next, a modification 2 of the lighting device of Embodiment 1 will be described. Hereinafter, the same reference numerals are given to the components common to the lighting device 200 and the lighting device 210, and the description thereof will be omitted.

[0214] Fig.24 and Fig.25 : is an explanatory diagram showing an example of the structure of the lighting device 220 of the modification 2. In addition, Fig.24 is a perspective view of the lighting device 220, Fig.25 is a cross-sectional view of the lighting device 220 .

[0215] The lighting device 220 includes a sunlight representation unit 60 and an auxiliary light source 70 in addition to the light source 10, the diffuser 20, and the housing 300. Hereinafter, the light source 10 may be referred to as a first light source, and the auxiliary light source 70 may be referred to as a second light source.

[0216] The sunlight expression part 60 is arranged on the front side f22 of the diffuser 20. The sunlight expression part 60 has an incident surface f61 and an exit surface f62. The incident surface f61 is, for example, a surface on the visually recognizable side opposite to the sunlight expression part 60. The exit surface f62 is, for example, a surface on the visually recognizable side of the sunlight expression part 60. Here, the visually recognizable side is a side that is visually recognizable by a user located on the main light-emitting surface side of the diffuser 20 in a state where the lighting device 220 is provided, and the visually recognizable opposite side refers to the opposite side thereof.

[0217] For example, the sunlight representation part 60 may be divided into a plurality of regions (in this example, sunlight representation parts 60a, 60b, 60c, 60d, etc. corresponding to the sides of the rectangular window area 301) for the sake of convenience. In addition, the division example of the sunlight representation part 60 is not limited to the above example.

[0218] When the sunlight representation portion 60 is divided into a plurality of zones for the sake of convenience, for example, the incident surface f61 and the outgoing surface f62 may also be divided into a plurality of zones according to the divided sunlight representation portion 60 .

[0219] In addition, Fig.25 In the example shown, the sunlight expression portion 60 is divided into four parts, which are respectively referred to as sunlight expression portions 60a, 60b, 60c, and 60d. In this case, the incident surface f61 and the exit surface f62 can also be divided into four parts. Hereinafter, the incident surface of the sunlight expression portion 60a is referred to as f61a, and the exit surface is referred to as f62a. Similarly, the incident surface of the sunlight expression portion 60b is referred to as f61b, and the exit surface is referred to as f62b, the incident surface of the sunlight expression portion 60c is referred to as f61c, and the exit surface is referred to as f62c, the incident surface of the sunlight expression portion 60d is referred to as f61d, and the exit surface is referred to as f62d.

[0220] The auxiliary light source 70 is disposed on the back side (the side opposite to the visual recognition side when viewed from the user) of the sunlight representation part 60. That is, the sunlight representation part 60 is disposed on the incident surface f61 side. For example, the auxiliary light source 70 may also be disposed between the sunlight representation part 60 and the diffuser 20.

[0221] When the sunlight representation portion 60 is divided into a plurality of zones for the sake of simplicity, the sunlight representation portion 60 includes an auxiliary light source 70 on the incident surface f61 side of at least one zone.

[0222] The auxiliary light source 70 is, for example, an LED light source. Although not shown in the figure, the auxiliary light source 70 may also include a substrate 72 and an LED element 73, similarly to the light source 10. In addition, the auxiliary light source 70 may also include a plurality of auxiliary light sources. In this case, similarly to the light source 10, the auxiliary light sources 70 may also be arranged on the substrate 72, for example. In this case, it may also be considered that there are a plurality of auxiliary light sources 70.

[0223] For example, when the sunlight representation part 60 is divided into a plurality of regions, at least one auxiliary light source 70 may be arranged in each region. In addition, for example, two or more auxiliary light sources 70 may be arranged in each region. As an example, when the sunlight representation part 60 is provided in a manner of dividing the polygonal window region 301, a plurality of auxiliary light sources 70 may be provided along each side of the window region 301.

[0224] The correlated color temperatures of the lights emitted by the different light sources may be the same or different.

[0225] In addition, the color of the light emitted from the auxiliary light source 70 may be a color other than white. In the case of a plurality of auxiliary light sources 70, the auxiliary light source 70 may include, for example, a white LED light source and an orange LED light source. In addition, the auxiliary light source 70 may include, for example, a white LED light source with a low color temperature and a white LED light source with a high color temperature.

[0226] The sunlight expression part 60 is constituted by a light diffuser, for example. The light diffuser may be a light diffuser in which fine particles are dispersed in a transparent member, or a light diffuser in which a surface of a transparent member is subjected to surface processing such as embossing.

[0227] The sunlight expression part 60 may also be composed of, for example, a transparent component and a light diffuser. In this case, the light diffuser may be provided on the incident surface side of the transparent component, may be provided on the emitting surface side, or may be provided on both sides. The light diffuser may also be, for example, a thin film coating composed of a transparent substrate and microparticles, or may be a diffusion sheet composed of a transparent substrate and microparticles. Such a light diffuser may also be applied or laminated on the surface of a transparent component to form the sunlight expression part 60.

[0228] The light emitted from the auxiliary light source 70 enters the sunlight expression part 60 from the incident surface f61 of the sunlight expression part 60, and is emitted from the emission surface f62 as diffused light. Thus, the emission surface f62 of the sunlight expression part 60 emits light.

[0229] The sunlight expression part 60 may be the entire surface of the exit surface f62 that emits light, or may be the part that emits light only. When the sunlight expression part 60 is divided into a plurality of zones, it may be the part that emits light in each zone. For example, the sunlight expression part 60 may be the entire zone that emits light, or may be the part that is in a non-luminous state. For example, the sunlight expression part 60 may control the lighting of a plurality of light sources provided as the auxiliary light sources 70, thereby causing a part of the sunlight expression part 60 to be in a non-luminous state. In addition, the sunlight expression part 60 may be the part that emits light only in a zone.

[0230] In addition, the lighting device 220 can also further include a light shielding plate 50 and a back plate 52 similarly to the lighting devices 200 and 210 .

[0231] In addition, if Fig.26 As shown, the sunlight representation portion 60 may also be formed integrally with the frame 300 . Fig.26 This is a cross-sectional view showing another example of the structure of the lighting device 220 according to the second modification.

[0232] <<Effect of the sunlight display unit 60>>

[0233] By providing the luminous sunlight representation part 60 on the emission side of the main light-emitting surface of the diffuser 20, the observer has the illusion that the sun is on the back side of the diffuser 20 and the window frame is illuminated by the sunlight. As a result, the natural feeling felt by the observer when the lighting device 220 functions as lighting is improved, and the sense of openness of the space is improved. In addition, by making the appropriate part that is not illuminated by sunlight into a non-luminous state like an actual window, the natural feeling felt by the observer when the lighting device 220 functions as lighting is further improved.

[0234] <Variation 3>

[0235] Next, a description will be given of a modification 3 of the lighting device of Embodiment 1. Hereinafter, the same reference numerals are given to the components common to the lighting devices 200 , 210 , and 220 , and description thereof will be omitted.

[0236] Figure 27 to Figure 30 : is an explanatory diagram showing an example of the structure of the lighting device 230 according to the modification 3. Figure 27 to Figure 29 is a cross-sectional view showing an example of the lighting device 230, Fig.30 It is a perspective view showing an example of the lighting device 230 .

[0237] The lighting device 230 includes a light return portion 80 in addition to the light source 10 , the diffuser 20 , the frame 300 , and the sunlight representation portion 60 .

[0238] The light-returning portion 80 is provided on the side surface f21 of the diffuser 20. The light-returning portion 80 is provided on at least one side surface f21 of the diffuser 20. The light-returning portion 80 causes the light guided in the diffuser 20 and reaching the light-returning portion 80 to be emitted toward the sunlight representation portion 60. The light-returning portion 80 changes the traveling direction. In addition, the light-returning portion 80 is an example of the deflection portion 80.

[0239] The light-reflecting portion 80 may also have a reflecting surface f81. In this case, the light-reflecting portion 80 reflects the light reaching the light-reflecting portion 80 at the reflecting surface f81 toward the sunlight-illuminating portion 60. In addition, the light-reflecting portion 80 may have a function of changing the direction of travel of the light reaching the end (second end) on the opposite side of the first end of the diffuser 20 where the incident surface is formed, and the light-reflecting portion 80 may be emitted toward the sunlight-illuminating portion 60. The specific form is not limited to Fig. 27 Example shown.

[0240] The light whose traveling direction is changed by the light return portion 80 is irradiated onto the incident surface f61 of the sunlight representation portion 60. The light enters the sunlight representation portion 60 from the incident surface f61, and is emitted from the emission surface f62 to become diffused light simulating sunlight.

[0241] The reflecting surface f81 is, for example, a mirror surface. The reflecting surface f81 is, for example, a diffuse reflecting surface. The reflecting surface f81 is, for example, provided by metal evaporation. The reflecting surface f81 is, for example, provided by white painting.

[0242] The light folding portion 80 may be formed, for example, by cutting off a portion of the side surface f21 of the diffuser 20. In this case, the cut surface becomes the reflection surface f81. Furthermore, the end of the diffuser 20 including the cut surface becomes the light folding portion 80. In this way, the diffuser 20 may also include the light folding portion 80.

[0243] In addition, the light reflecting portion 80 may be integral with the diffuser 20 or may be separate from it.

[0244] In addition, for example, Fig.28 As shown, the light reflection portion 80 may also be disposed on the inner side surface f34 of the frame body 300 .

[0245] In addition, the lighting device 230 may further include an auxiliary light source 70 disposed on the incident surface f61 side of the sunlight representation portion 60. The auxiliary light source 70 increases the light quantity of the light emitted from the sunlight representation portion 60.

[0246] In addition, the lighting device 230 and the other lighting devices described above may also have light sources 10 on two or more end faces. In this case, the lighting device may also have light sources 10 on opposite end faces, for example. In this case, for example, Fig.29 As shown, the lighting device 230 can also be configured so that at the opposite ends of the diffuser 20, the incident surface of the diffuser 20 and the light returning portion 80 (reflection surface f81) are alternately arranged on the same end surface and staggered between the opposite end surfaces.

[0247] In addition, the incident surface of the diffuser 20 and the light folding portion 80 (reflection surface f81) are arranged without gaps along the end surface, but in this case, they can also be arranged at different positions in the thickness direction of the diffuser 20. In this case, the light source 10 arranged at one end surface can also make the light Li incident so that the light Lt is guided from the incident surface arranged at the end surface to the light folding portion 80 of the opposite end surface.

[0248] In addition, although not shown in the figure, two or more lighting units 100 may be stacked in a manner such that the traveling directions of the light Li are different. In this way, the light source 10 can be arranged in any two or more directions relative to the center of the diffuser 20. In this case, a plurality of light sources 10 may be provided corresponding to the area where the sunlight representation portion 60 is provided.

[0249] <<Effects of the light folding portion 80>>

[0250] By emitting the light reflected by the light reflecting portion 80 from the sunlight representation portion 60 , it is possible to utilize the light that is guided by the diffuser 20 and emitted from the side surface f21 and becomes lost, thereby achieving improvement in light utilization efficiency.

[0251] Furthermore, in the case where the thickness of the lighting device 230 cannot be increased due to the sunlight expression portion 60, such as in the case of a skylight of a moving object, the light return portion 80 can also serve as the sunlight expression portion 60. For example, by providing the light return portion 80 on the side surfaces f21a, f21c, and f21d of the diffuser 20, the light return portion 80 can also serve as the sunlight expression portion 60. Fig.30 1 is a perspective view showing an example of an illumination device 230 in which a folding portion 80 (at least a reflecting surface f81) serving as a sunlight display portion 60 is provided on the side surface of the diffuser 20. In this case, the light folding portion 80 may have, for example, a deflection function that changes the traveling direction of light that has reached the end surface on the opposite side of the incident surface so that the light is emitted toward the main emission direction side, that is, toward the space facing the main light emitting surface of the diffuser 20.

[0252] In addition, in the case where the light reflection portion 80 also serves as the sunlight representation portion 60, the light reflection portion 80 may also have a light scattering function in addition to the deflection function. In addition, the light scattering function may also be achieved by performing surface processing such as embossing on the reflection surface f81. In addition, the light scattering function may also be achieved, for example, by adding a thin film having reflective diffusion properties to the reflection surface f81 or by applying white coating. In addition, the light scattering function may also be achieved, for example, by including particles between the reflection surface f81 and the exit surface. In addition, the particles may also be the particles 202 of the diffuser 20. In this case, it may also be shown that the diffuser 20 also serves as the light reflection portion 80 and the sunlight representation portion 60. In addition, it may also be shown that the diffuser 20 includes the light reflection portion 80 and the sunlight representation portion 60 as structural elements.

[0253] In addition, the light-reflecting portion 80 may also provide an exit surface (in the case of being formed integrally with the diffuser 20, corresponding to the end of the front surface f22 of the diffuser 20. Hereinafter, when indicating the region where the light is emitted after the reflection, it is referred to as the exit surface f82) from which the reflected light is emitted, with a light-scattering function. The light-scattering function may also be achieved by subjecting the exit surface f82 to surface processing such as embossing, light-diffusing coating, or adding a light-diffusing film.

[0254] in addition, Fig.30 The example shown is an example in which the light-returning portions 80 are provided on three side surfaces. However, the reflecting surface f81 may be realized by using a half-mirror or the like, thereby providing the light-returning portions 80 on all the end surfaces.

[0255] Implementation Method 2

[0256] Fig.31 1 is an explanatory diagram showing an example of the structure of the lighting device 240 according to Embodiment 2. The lighting device 240 includes a light source 10, a diffuser 20, a frame 300, and a light extraction portion 90. Hereinafter, the same reference numerals are given to the common structural elements of the lighting device 200, the lighting device 210, the lighting device 220, and the lighting device 230, and the description thereof is omitted.

[0257] In the lighting device 240, the diffuser 20 has a light incident surface 24 as a light incident portion, a light guiding diffuser 25, a front surface f22 and a back surface f23 as a scattered light exit portion (first light exit surface), and a second light exit surface 26 as a propagation light exit portion. In this example, in the diffuser 20, a portion that includes a medium and light scattering particles and generates scattered light by guiding incident light and scattering it with the aid of particles 202 is referred to as a light guiding diffuser.

[0258] The light emitted from the light emitting surface f11 of the light source 10 is incident on the light incident surface 24. The light guide diffusion part 25 has a substrate 201 as a medium and a plurality of light scattering particles (particles 202) present in the substrate 201. The light guide diffusion part 25 guides the incident light and scatters it with the help of the particles 202, thereby generating light Ls. The diffuser 20 has, for example, a light incident surface 24 at the end of the light guide diffusion part 25, and a second light exit surface 26 at the end opposite to the light incident surface 24. The light source 10 is arranged at the end of the diffuser 20, and the light emitted from the light emitting surface f11 of the light source 10 is incident on the inside of the light guide diffusion part 25 from the light incident surface 24.

[0259] The light incident on the light guide diffusion part 25 is guided inside the light guide diffusion part 25 and emitted from the second light exit surface 26. Alternatively, the light emitted from the light emitting surface f11 of the light source 10 is incident on the inside of the light guide diffusion part 25 from the light incident surface 24, is guided inside the light guide diffusion part 25, is scattered by the particles 202 as light scattering particles included in the light guide diffusion part 25, becomes light Ls, and is emitted from the first light exit surface, that is, the front surface f22, etc. The correlated color temperature of the light emitted from the second light exit surface 26 is lower than the correlated color temperature of the light emitted from the front surface f22.

[0260] Here, by the light extraction portion 90 provided near the second light exit surface 26, at least a portion of the light emitted from the second light exit surface 26 is directed in the same direction as the light Ls (in Fig.31 In the example, it is a direction perpendicular to the light guiding direction, that is, a direction toward the space side facing the main emitting surface, i.e., the front side f22). In order to control the refraction, reflection, diffusion, transmission, etc. of the emitted light (i.e., the emitted light guided inside the light guiding diffusion part 25 and emitted from the second light emitting surface 26), the light extraction part 90 is formed with, for example, a lens, a reflector, a film, a surface coating, etc., and has the function of directing the emitted light emitted from the second light emitting surface 26 in a specific direction. Fig.31 In the example, the specific direction is a direction perpendicular to the light guiding direction (-Y direction), which is a direction toward the space facing the front f22, for example, toward the visual recognition side. In addition, the specific direction may also be a direction perpendicular to the light guiding direction (+Y direction), which is a direction toward the space facing the back f23 (the opposite side of visual recognition).

[0261] As a specific example, the light emitted from the second light exit surface 26 is diffused light with expansion in the angular direction. In order to deflect the light in a specific direction and take it out on the room side, the light extraction portion 90 is set as a reflector, and the reflecting surface of the reflector has a curvature. According to this structure, the light reflected from the light extraction portion 90 is controlled to be approximately parallel light, and can travel in the direction toward the front f22 side, that is, in a specific direction.

[0262] In addition, in order to realize a structure in which a person located on the front side f22 does not feel dazzled when viewing the light extraction portion 90, for example, it is preferable to provide the light extraction portion 90 with a diffusion function. In this case, the dazzle felt by the person can be suppressed, and the light diffused in the light extraction portion 90 can be extracted on the front side f22.

[0263] In addition, the light extraction portion 90 may be provided as a modified example of the light folding portion 80 , or may be provided separately from the light folding portion 80 .

[0264] Implementation 3

[0265] Fig.32The following is a cross-sectional view schematically showing the structure of the lighting device 250 according to Embodiment 3. Next, the particle concentration (i.e., the number of particles 202 per unit volume N [particles / mm2]) is increased in the diffuser 20a (more specifically, in the light guide diffusion section 25a). 3 ]) is illustrated with an example of distribution.

[0266] like Fig.32 As shown, the lighting device 250 has a light source 10, a diffuser 20a, and an opening corresponding to the area 301 (eg Figure 7 Hereinafter, the same reference numerals are given to the common components of the lighting device 200, the lighting device 210, the lighting device 220, the lighting device 230, and the lighting device 240, and the description thereof will be omitted.

[0267] The lighting device 250 adopts an edge-incident method in which the light source 10 is arranged to face the light incident surface 24, which is a side surface located at the end of the diffuser 20a. The diffuser 20a has the light incident surface 24, a light guide diffusion part 25a, and a front surface f22 and a back surface f23 as first light emitting surfaces.

[0268] Light emitted from the light emitting surface f11 of the light source 10 is incident on the light incident surface 24. The light guide diffusion part 25a includes a substrate 201 as a medium and a plurality of particles 202 present in the substrate 201. The light guide diffusion part 25a guides the incident light and scatters it by the particles 202, thereby generating light Ls. The light Ls is emitted through the opening 33 of the frame 300.

[0269] The diffuser 20a may also have a region 27 having a low concentration of particles 202 near at least one side surface. Fig.32 As shown, when the area of ​​the front surface f22 of the light guide diffusion part 25a is larger than the area of ​​the opening 33 provided in the lighting device 250, the region 27 that cannot be visually recognized through the opening 33 is set as a region with a low concentration of particles 202, thereby suppressing the light emission of the region 27 and improving the light utilization efficiency of the entire lighting device 250. That is, if the concentration of the particles 202 in the region 27 of the light guide diffusion part 25a that cannot be visually recognized through the opening 33 is lower than the concentration of the particles 202 in the region of the light guide diffusion part 25a that can be visually recognized through the opening 33, the scattering probability in the region can be suppressed, and therefore, the light utilization efficiency is improved for the purpose of extracting the desired blue color as illumination light from the incident light or extracting the propagated light as illumination light or light simulating sunlight at the opposite end of the incident surface.

[0270] In addition, the region 27 may be a region provided near at least one side surface of the light guide diffusion portion 25a and not having the particles 202. Fig.32In the example, the region 27 without particles 202 may be provided in the portion of the light guide diffusion section 25a that cannot be visually recognized through the opening 33. In this way, light emission in the region 27 can be suppressed, and the light utilization efficiency of the entire lighting device 250 can be improved.

[0271] The region 27 that cannot be visually recognized through the opening 33 is not used to emit the scattered light Ls simulating the blue sky, so the length of the light-guiding diffusion part 25a in the light-guiding direction (Z direction) other than this region 27 may also be set to the above-mentioned Zd. In addition, in the case where the region 27 is a region without particles 202, the light incident surface 24 may not be provided at the end of the light-guiding diffusion part 25a. That is, the diffuser 20a may be configured so that light is incident on the light-guiding diffusion part 25a via the region 27, or may be configured in the same manner as the region 27. Fig.32 In addition, in terms of being able to control the intensity and direction of the light to be guided with high precision, it is more preferable that the region 27 without particles 202 is provided at an end other than the end where the light incident surface 24 is provided. Figure 5 In the case of the side surface f21a, the region 27 may be provided at the end of the side surface f21b, the end of the side surface f21c, and the end of the side surface f21d. Figure 5 In the case of the side f21a and the side f21b, the region 27 may be provided at the end portion on the side f21c and the end portion on the side f21d.

[0272] The length Zd may be the length of the light guide diffusion part 25a excluding the region 27. For example, the length Zd of the light guide diffusion part 25a in the optical axis direction of the light source 10 may be the length of the light guide diffusion part 25a excluding the region 27 in the optical axis direction.

[0273] Even if the region in the diffuser 20 cannot be visually recognized through the opening 33, when it has the above-mentioned purpose of supplying light Ls to the sunlight representation portion 60 or the light return portion 80, the region can be excluded from the above-mentioned region 27. In other words, with respect to the region in the diffuser 20 that cannot be visually recognized through the opening 33 or does not have other purposes such as supplying scattered light to the sunlight representation portion 60 or the light return portion 80, the concentration of the particles 202 can be made lower than that of other regions in order to suppress the generation of scattered light or not generate scattered light.

[0274] In addition, in the above-mentioned embodiments, terms such as "parallel" or "perpendicular" are sometimes used to indicate the positional relationship between components or the shape of components. These terms indicate a range that takes into account manufacturing tolerances or assembly deviations. Therefore, when the positional relationship between components or the shape of components is described in the claims, it indicates a range that takes into account manufacturing tolerances or assembly deviations.

[0275] Furthermore, although the embodiments of the lighting device, the window with lighting function, and the building material for a window of the present invention have been described above, the lighting device, the window with lighting function, and the building material for a window of the present invention are not limited to these embodiments.

[0276] Description of symbols

[0277] 100 lighting units

[0278] 200, 210, 220, 230, 240, 250 lighting fixtures

[0279] 10 Light Source

[0280] 12 substrate

[0281] 13 LED components (light emitting components)

[0282] 20, 20a Diffuser

[0283] f21 side (end)

[0284] f22 front side (first surface)

[0285] f23 Back (2nd surface)

[0286] 24 Light incident surface

[0287] 25, 25a Light guide diffusion part

[0288] 26 Second light exit surface

[0289] 201 Base material

[0290] 202 particles

[0291] 300 Frame

[0292] 301 Area (Window Area)

[0293] 31, 32 frame

[0294] 33, 37 Opening

[0295] 35, 36, 39 grooves

[0296] 38 Joint

[0297] f31 Surface 1

[0298] f32 Surface 2

[0299] f33 outer side

[0300] f34 inner side

[0301] f351 Bottom surface (of groove 35)

[0302] f352 (Side of groove 35)

[0303] f361 Bottom surface (of groove 36)

[0304] f362 (Side of groove 36)

[0305] 400 Mobile

[0306] 402 Skylight

[0307] 403 Windows

[0308] 40 Set body

[0309] 50 shading plate (shielding part)

[0310] 51 Window Frame

[0311] 52 Back panel

[0312] 60 Sunshine Performance Department

[0313] 70 Auxiliary light source

[0314] 72 substrate

[0315] 73 LED components (light emitting components)

[0316] 80 Light return unit (deflection unit)

[0317] 90 Light extraction unit

Claims

1. A lighting device, characterized in that: The lighting device comprises: a first light source that emits a first light; a diffuser for the first light to be incident upon and for emitting scattered light; as well as a frame supporting the first light source and the diffuser, The diffuser includes nanoparticles and guides the incident first light so that the light is scattered by the nanoparticles and emitted as the scattered light. The diffuser comprises: a light incident surface for the first light to be incident; a first surface on which a first light emitting surface for emitting the scattered light is formed; and a second surface facing the first surface. The light incident surface is formed at a first end portion of the diffuser, The frame body has openings on at least a portion of a region where the first light exit surface is formed on the first surface of the diffuser and a region on the second surface corresponding thereto. The correlated color temperature of the scattered light is higher than the correlated color temperature of the first light, in, The lighting device also has: A sunlight expression portion, which is disposed on the first surface side of the diffuser, and includes an incident surface and a light-emitting surface that reproduces sunlight, that is, an emitting surface; and a second light source disposed between the sunlight display portion and the diffuser, The light emitted from the second light source enters the sunlight expressing portion from the incident surface of the sunlight expressing portion, and is emitted from the emission surface of the sunlight expressing portion as diffused light.

2. A lighting device, characterized in that: The lighting device comprises: a first light source that emits a first light; a diffuser for the first light to be incident upon and for emitting scattered light; as well as a frame supporting the first light source and the diffuser, The diffuser includes nanoparticles and guides the incident first light so that the light is scattered by the nanoparticles and emitted as the scattered light. The diffuser comprises: a light incident surface for the first light to be incident; a first surface on which a first light emitting surface for emitting the scattered light is formed; and a second surface facing the first surface. The light incident surface is formed at a first end portion of the diffuser, The frame body has openings on at least a portion of a region where the first light exit surface is formed on the first surface of the diffuser and a region on the second surface corresponding thereto. The correlated color temperature of the scattered light is higher than the correlated color temperature of the first light, in, The lighting device also has: A sunlight representation portion, which is disposed on the first surface side of the diffuser and includes an incident surface and a light-emitting surface for reproducing sunlight, that is, an emitting surface; and a deflection unit provided on at least one end surface of the diffuser or an inner side surface of the frame body facing the end surface, and changing a traveling direction of the first light; The light whose direction has been changed by the deflection unit enters the sunlight representation unit from the incident surface of the sunlight representation unit and is emitted from the emission surface of the sunlight representation unit to become diffused light simulating sunlight.

3. A lighting device, characterized in that: The lighting device comprises: a first light source that emits a first light; a diffuser for the first light to be incident upon and for emitting scattered light; as well as a frame supporting the first light source and the diffuser, The diffuser includes nanoparticles and guides the incident first light so that the light is scattered by the nanoparticles and emitted as the scattered light. The diffuser comprises: a light incident surface for the first light to be incident; a first surface on which a first light emitting surface for emitting the scattered light is formed; and a second surface facing the first surface. The light incident surface is formed at a first end portion of the diffuser, The frame body has openings on at least a portion of a region where the first light exit surface is formed on the first surface of the diffuser and a region on the second surface corresponding thereto. The correlated color temperature of the scattered light is higher than the correlated color temperature of the first light, in, A deflection unit for changing the traveling direction of the first light is provided on at least one end surface of the diffuser or an inner side surface of the frame body facing the end surface. The deflection unit has a deflection function of changing a traveling direction of the first light so that the first light is emitted toward a space facing the first light exit surface.

4. A lighting device, characterized in that: The lighting device comprises: a first light source that emits a first light; a diffuser for the first light to be incident upon and for emitting scattered light; as well as a frame supporting the first light source and the diffuser, The diffuser includes nanoparticles and guides the incident first light so that the light is scattered by the nanoparticles and emitted as the scattered light. The diffuser comprises: a light incident surface for the first light to be incident; a first surface on which a first light emitting surface for emitting the scattered light is formed; and a second surface facing the first surface. The light incident surface is formed at a first end portion of the diffuser, The frame body has openings on at least a portion of a region where the first light exit surface is formed on the first surface of the diffuser and a region on the second surface corresponding thereto. The correlated color temperature of the scattered light is higher than the correlated color temperature of the first light, in, The diffuser has a second light emitting surface, which is arranged opposite to the light incident surface and emits the light guided in the diffuser. The lighting device further includes a light extraction portion that deflects the light emitted from the second light emission surface toward a space facing the first light emission surface.

5. The lighting device according to any one of claims 1 to 4, wherein: The first light emitting surface is formed on at least one surface connected to the first end and the second end, and the first light incident from the light incident surface is guided to reach the second end.

6. The lighting device according to any one of claims 1 to 4, wherein: As the first light source, there are a plurality of light sources that emit light of at least two or more different color temperatures.

7. The lighting device according to any one of claims 1 to 4, wherein: The frame is composed of two or more separable structures.

8. The lighting device according to claim 7, wherein: The frame includes a first frame portion and a second frame portion that are separable from each other. The first frame portion supports the diffuser. The second frame portion supports the first light source.

9. The lighting device according to claim 7, wherein: The frame includes a first frame portion and a second frame portion that are separable from each other. The first frame supports the diffuser and the first light source. The second frame portion supports the first frame portion in a set state and includes a power supply portion for supplying power to the first light source. The first frame portion includes a power receiving portion that receives power supplied from the power supply portion.

10. The lighting device according to any one of claims 1 to 4, wherein: The diffuser has a back plate on the second surface side thereof so as to be openable and closable. The back plate is an opaque structure.

11. The lighting device according to any one of claims 1 to 4, wherein: The diffuser has a light shielding portion on at least one of the first surface side and the second surface side for shielding external light.

12. The lighting device according to any one of claims 1 to 4, wherein: The frame supports the diffuser so as to be openable and closable.

13. The lighting device according to any one of claims 1 to 4, wherein: The diffuser includes two or more regions having different particle concentrations.

14. The lighting device according to claim 13, wherein: The concentration of the nanoparticles in a region of the diffuser that cannot be visually recognized through the opening of the frame is lower than the concentration of the nanoparticles in a region of the diffuser that can be visually recognized through the opening of the frame.

15. A window with lighting function, characterized in that: The window with lighting function is used as a window of a building or a moving object. The window with lighting function has: a diffuser for the first light to be incident upon and for emitting scattered light; as well as a frame supporting the diffuser, The diffuser includes nanoparticles and guides the incident first light so that the light is scattered by the nanoparticles and emitted as the scattered light. The diffuser comprises: a light incident surface for the first light to be incident; a first surface on which a first light emitting surface for emitting the scattered light is formed; and a second surface facing the first surface. The light incident surface is formed at a first end portion of the diffuser, The frame body has openings on at least a portion of a region where the first light exit surface is formed on the first surface of the diffuser and a region on the second surface corresponding thereto. The correlated color temperature of the scattered light is higher than the correlated color temperature of the first light, in, The window with lighting function also has: A sunlight expression portion, which is disposed on the first surface side of the diffuser, and includes an incident surface and a light-emitting surface that reproduces sunlight, that is, an emitting surface; and a second light source disposed between the sunlight display portion and the diffuser, The light emitted from the second light source enters the sunlight expressing portion from the incident surface of the sunlight expressing portion, and is emitted from the emission surface of the sunlight expressing portion as diffused light.

16. A window with lighting function, characterized in that: The window with lighting function is used as a window of a building or a moving object. The window with lighting function has: a diffuser for the first light to be incident upon and for emitting scattered light; as well as a frame supporting the diffuser, The diffuser includes nanoparticles and guides the incident first light so that the light is scattered by the nanoparticles and emitted as the scattered light. The diffuser comprises: a light incident surface for the first light to be incident; a first surface on which a first light emitting surface for emitting the scattered light is formed; and a second surface facing the first surface. The light incident surface is formed at a first end portion of the diffuser, The frame body has openings on at least a portion of a region where the first light exit surface is formed on the first surface of the diffuser and a region on the second surface corresponding thereto. The correlated color temperature of the scattered light is higher than the correlated color temperature of the first light, in, The window with lighting function also has: A sunlight representation portion, which is disposed on the first surface side of the diffuser and includes an incident surface and a light-emitting surface for reproducing sunlight, that is, an emitting surface; and a deflection unit provided on at least one end surface of the diffuser or an inner side surface of the frame body facing the end surface, and changing a traveling direction of the first light; The light whose direction has been changed by the deflection unit enters the sunlight representation unit from the incident surface of the sunlight representation unit and is emitted from the emission surface of the sunlight representation unit to become diffused light simulating sunlight.

17. A window with lighting function, characterized in that: The window with lighting function is used as a window of a building or a moving object. The window with lighting function has: a diffuser for the first light to be incident upon and for emitting scattered light; as well as a frame supporting the diffuser, The diffuser includes nanoparticles and guides the incident first light so that the light is scattered by the nanoparticles and emitted as the scattered light. The diffuser comprises: a light incident surface for the first light to be incident; a first surface on which a first light emitting surface for emitting the scattered light is formed; and a second surface facing the first surface. The light incident surface is formed at a first end portion of the diffuser, The frame body has openings on at least a portion of a region where the first light exit surface is formed on the first surface of the diffuser and a region on the second surface corresponding thereto. The correlated color temperature of the scattered light is higher than the correlated color temperature of the first light, in, A deflection unit for changing the traveling direction of the first light is provided on at least one end surface of the diffuser or an inner side surface of the frame body facing the end surface. The deflection unit has a deflection function of changing a traveling direction of the first light so that the first light is emitted toward a space facing the first light exit surface.

18. A window with lighting function, characterized in that: The window with lighting function is used as a window of a building or a moving object. The window with lighting function has: a diffuser for the first light to be incident upon and for emitting scattered light; as well as a frame supporting the diffuser, The diffuser includes nanoparticles and guides the incident first light so that the light is scattered by the nanoparticles and emitted as the scattered light. The diffuser comprises: a light incident surface for the first light to be incident; a first surface on which a first light emitting surface for emitting the scattered light is formed; and a second surface facing the first surface. The light incident surface is formed at a first end portion of the diffuser, The frame body has openings on at least a portion of a region where the first light exit surface is formed on the first surface of the diffuser and a region on the second surface corresponding thereto. The correlated color temperature of the scattered light is higher than the correlated color temperature of the first light, in, The diffuser has a second light emitting surface, which is arranged opposite to the light incident surface and emits the light guided in the diffuser. The window with an illumination function further includes a light extraction portion that deflects the light emitted from the second light emission surface toward a space facing the first light emission surface.

19. The window with lighting function according to any one of claims 15 to 18, wherein: The window with lighting function has a first light source, and the first light source emits the first light. The frame supports the first light source and the diffuser.

20. A building material for windows, characterized in that: The window building material has: a first light source that emits a first light; a diffuser for the first light to enter and for emitting scattered light simulating the sky; and a frame supporting the first light source and the diffuser, The diffuser includes nanoparticles and guides the incident first light so that the first light is emitted as the scattered light by Rayleigh scattering of the nanoparticles to simulate the sky. The diffuser comprises: a light incident surface for the first light to be incident; a first surface on which a first light emitting surface for emitting the scattered light is formed; and a second surface facing the first surface. The light incident surface is formed at a first end portion of the diffuser, The frame body has openings on at least a portion of a region where the first light exit surface is formed on the first surface of the diffuser and a region on the second surface corresponding thereto. The correlated color temperature of the scattered light is higher than the correlated color temperature of the first light, in, The window building material also has: A sunlight expression portion, which is disposed on the first surface side of the diffuser, and includes an incident surface and a light-emitting surface that reproduces sunlight, that is, an emitting surface; and a second light source disposed between the sunlight display portion and the diffuser, The light emitted from the second light source enters the sunlight expressing portion from the incident surface of the sunlight expressing portion, and is emitted from the emission surface of the sunlight expressing portion as diffused light.

21. A building material for windows, characterized in that: The window building material has: a first light source that emits a first light; a diffuser for the first light to be incident upon and for emitting scattered light; as well as a frame supporting the first light source and the diffuser, The diffuser includes nanoparticles and guides the incident first light so that the light is scattered by the nanoparticles and emitted as the scattered light. The diffuser comprises: a light incident surface for the first light to be incident; a first surface on which a first light emitting surface for emitting the scattered light is formed; and a second surface facing the first surface. The light incident surface is formed at a first end portion of the diffuser, The frame body has openings on at least a portion of a region where the first light exit surface is formed on the first surface of the diffuser and a region on the second surface corresponding thereto. The correlated color temperature of the scattered light is higher than the correlated color temperature of the first light, in, The window building material also has: A sunlight representation portion, which is disposed on the first surface side of the diffuser and includes an incident surface and a light-emitting surface for reproducing sunlight, that is, an emitting surface; and a deflection unit provided on at least one end surface of the diffuser or an inner side surface of the frame body facing the end surface, and changing a traveling direction of the first light; The light whose direction has been changed by the deflection unit enters the sunlight representation unit from the incident surface of the sunlight representation unit and is emitted from the emission surface of the sunlight representation unit to become diffused light simulating sunlight.

22. A building material for windows, characterized in that: The window building material has: a first light source that emits a first light; a diffuser for the first light to be incident upon and for emitting scattered light; as well as a frame supporting the first light source and the diffuser, The diffuser includes nanoparticles and guides the incident first light so that the light is scattered by the nanoparticles and emitted as the scattered light. The diffuser comprises: a light incident surface for the first light to be incident; a first surface on which a first light emitting surface for emitting the scattered light is formed; and a second surface facing the first surface. The light incident surface is formed at a first end portion of the diffuser, The frame body has openings on at least a portion of a region where the first light exit surface is formed on the first surface of the diffuser and a region on the second surface corresponding thereto. The correlated color temperature of the scattered light is higher than the correlated color temperature of the first light, in, A deflection unit for changing the traveling direction of the first light is provided on at least one end surface of the diffuser or an inner side surface of the frame body facing the end surface. The deflection unit has a deflection function of changing a traveling direction of the first light so that the first light is emitted toward a space facing the first light exit surface.

23. A building material for windows, characterized in that: The window building material has: a first light source that emits a first light; a diffuser for the first light to be incident upon and for emitting scattered light; as well as a frame supporting the first light source and the diffuser, The diffuser includes nanoparticles and guides the incident first light so that the light is scattered by the nanoparticles and emitted as the scattered light. The diffuser comprises: a light incident surface for the first light to be incident; a first surface on which a first light emitting surface for emitting the scattered light is formed; and a second surface facing the first surface. The light incident surface is formed at a first end portion of the diffuser, The frame body has openings on at least a portion of a region where the first light exit surface is formed on the first surface of the diffuser and a region on the second surface corresponding thereto. The correlated color temperature of the scattered light is higher than the correlated color temperature of the first light, in, The diffuser has a second light emitting surface, which is arranged opposite to the light incident surface and emits the light guided in the diffuser. The window building material further includes a light extraction portion configured to deflect the light emitted from the second light emission surface toward a space facing the first light emission surface.

Images