Surface-emitting lighting panel and surface-emitting lighting

Abstract

To provide surface-emitting lighting panels and surface-emitting lighting fixtures that are rich in design or entertainment value. [Solution] A surface-emitting illumination panel having a first main surface and a second main surface opposite to the first main surface, comprising a surface-emitting film and a light-selective layer arranged so that light emitted from the surface-emitting film is directly or indirectly incident upon it, wherein the surface-emitting film has a third main surface on the first main surface side, a fourth main surface on the second main surface side, and a light-receiving portion that receives light emitted from a light source, and emits light from at least the third main surface, a portion of the light emitted from the third main surface passes through the light-selective layer and is emitted on the first main surface side or the second main surface side, and (a) the total light reflectance of the light-selective layer is 20% or more and 90% or less, and (b) the absorption rate of the light-selective layer is less than 10%.

Description

[Technical Field]

[0001] This invention relates to a surface-emitting lighting panel and surface-emitting lighting. [Background technology]

[0002] In recent years, lighting fixtures that are rich in design or entertainment value have been proposed. For example, Patent Document 1 proposes a "single-sided lighting combined window having a plate-shaped transparent substrate having two main surfaces, and a plurality of reflective concave surfaces and / or reflective convex surfaces formed on one of the main surfaces of the transparent substrate, wherein when illuminated, the plurality of reflective concave surfaces and / or reflective convex surfaces reflect the illumination light emitted from the light source, incident on the edge of the transparent substrate, guided by total internal reflection within the transparent substrate, toward the other main surface of the transparent substrate, and emit illumination light from the other main surface that is incident at an angle of incidence below the critical angle at the interface of the other main surface, thereby making the transparent substrate function as single-sided lighting, and when not illuminated, the transparent substrate functions as a light-transmitting window."

[0003] Patent Document 2 proposes an optical device comprising "a light guide layer, a first optical functional layer provided on the first main surface of the light guide layer, a second optical functional layer provided on the second main surface of the light guide layer opposite to the first main surface, and an optical medium layer provided on the surface of the second optical functional layer opposite to the light guide layer, wherein the refractive index of the first optical functional layer is lower than that of the light guide layer."

[0004] Patent Document 3 proposes a "light guide member for a lighting device having a first emission surface and a second emission surface opposite to the first emission surface, comprising: a light receiving section that receives light emitted from a light source; a light guide layer having a first main surface on the side of the first emission surface and a second main surface on the side of the second emission surface; and a light distribution control structure having a plurality of internal spaces, each of which has a first inclined surface that directs a portion of the light propagating within the light guide layer toward the first emission surface by internal total internal reflection, and a second inclined surface opposite to the first inclined surface, and is configured to emit first light having a first light distribution from the first emission surface and second light having a second light distribution from the second emission surface."

[0005] Patent Document 4 proposes "an optical laminate having a first main surface and a second main surface opposite to the first main surface, comprising: a light receiving portion for receiving light emitted from a light source; a light guide layer having a third main surface on the first main surface side and a fourth main surface on the second main surface side; a light-reflecting mirror layer disposed on the fourth main surface side of the light guide layer; and a light distribution control structure having a plurality of internal spaces, wherein the plurality of internal spaces form interfaces that direct a portion of the light propagating within the light guide layer toward the first main surface side or the second main surface side by total internal reflection." [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] International Publication No. 2019 / 102959 [Patent Document 2] International Publication No. 2019 / 182091 [Patent Document 3] International Publication No. 2022 / 260080 [Patent Document 4] International Publication No. 2023 / 276705 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] Conventional surface-emitting lighting lacks in design or entertainment value. Furthermore, decorating surface-emitting lighting panels with colored film can lead to problems such as light absorption reducing light output, and the overlap of the white light source and the colored film diminishing vibrancy. [Means for solving the problem]

[0008] One aspect of the present disclosure relates to a surface-emitting illumination panel having a first main surface and a second main surface opposite to the first main surface, comprising a surface-emitting film and a light-selective layer arranged so that light emitted from the surface-emitting film is directly or indirectly incident upon it, wherein the surface-emitting film has a third main surface on the first main surface side, a fourth main surface on the second main surface side, and a light-receiving portion for receiving light emitted from a light source, and emits light from at least the third main surface, a portion of the light emitted from the third main surface passes through the light-selective layer and is emitted on the first main surface side or the second main surface side, and (a) the total light reflectance of the light-selective layer is 20% or more and 90% or less, and (b) the absorption rate of the light-selective layer is less than 10%.

[0009] Another aspect of this disclosure relates to a surface-emitting illumination comprising the above-described surface-emitting illumination panel and a light source that emits light toward the light-receiving surface. [Effects of the Invention]

[0010] This disclosure provides surface-emitting lighting panels and surface-emitting lighting that are highly aesthetically pleasing or entertaining. [Brief explanation of the drawing]

[0011] [Figure 1] This is a schematic cross-sectional view showing the structure of an example of a surface-emitting film according to the present disclosure. [Figure 2] This is a schematic cross-sectional view showing the structure of an example of a surface-emitting illumination (PD) according to the first embodiment. [Figure 3] This is a schematic cross-sectional view showing the structure of an example of a surface-emitting illumination (PM) according to the second embodiment. [Figure 4]It is a schematic cross-sectional view showing the structure of another example of surface-emitting illumination (PM) according to the third embodiment. [Figure 5A] It is a schematic cross-sectional view showing the structure of a modified example of surface-emitting illumination (PD) according to the first embodiment. [Figure 5B] It is a schematic cross-sectional view showing the structure of another modified example of surface-emitting illumination (PD) according to the first embodiment. [Figure 5C] It is a schematic cross-sectional view showing the structure of yet another modified example of surface-emitting illumination (PD) according to the first embodiment.

Modes for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present disclosure will be described with examples, but the present disclosure is not limited to the examples described below. In the following description, specific numerical values and materials may be exemplified, but other numerical values and materials may be applied as long as the effects of the present disclosure can be obtained. In this specification, the description "numerical value A to numerical value B" includes numerical value A and numerical value B, and can be read as "numerical value A or more and numerical value B or less". In the following description, when the lower limit and the upper limit of a numerical value regarding a specific physical property or condition are exemplified, any combination of any of the exemplified lower limits and any of the exemplified upper limits can be made as long as the lower limit is not more than the upper limit. When a plurality of materials are exemplified, one of them may be selected and used alone, or two or more of them may be used in combination.

[0013] In addition, the present disclosure includes combinations of matters described in two or more claims arbitrarily selected from a plurality of claims described in the appended claims. That is, as long as no technical contradiction occurs, matters described in two or more claims arbitrarily selected from a plurality of claims described in the appended claims can be combined.

[0014] (1) A surface-emitting illumination panel according to the embodiment of this disclosure (hereinafter also referred to as "surface-emitting illumination panel (P)") has a first main surface and a second main surface opposite to the first main surface. Here, "surface-emitting illumination panel" is a sheet-like optical laminate having a first main surface and a second main surface, and "sheet-like" is used to mean a plate-like, film-like or membrane-like form, and does not specify the rigidity (flexibility) and thickness of the sheet. The sheet-like optical laminate may be used in a curved form and can be used in various forms.

[0015] The surface-emitting illumination panel (P) comprises a surface-emitting film and a light-selective layer arranged so that light emitted from the surface-emitting film is incident on it directly or indirectly.

[0016] A surface-emitting film is a film-like component that receives light emitted from a light source, propagates it in two dimensions, and emits light from a two-dimensional plane. A surface-emitting film typically has a sheet-like light guide layer, through which light emitted from a light source propagates.

[0017] A photoselective layer is an optical component that transmits some light while reflecting other light. Typical examples of photoselective layers include dichroic films and half-mirrors, which transmit light in a specific wavelength range and reflect light in the remaining wavelength range. Here, we do not include polarizing elements or quarter-wave plates, which are not related to aesthetic design, as photoselective layers.

[0018] When the light-selective layer is positioned so that light emitted from the surface-emitting film is directly incident on it, the light emitted from the surface-emitting film enters the light-selective layer without being reflected even once by the components of the surface-emitting illumination panel (P).

[0019] When the light-selective layer is positioned so that light emitted from the surface-emitting film is indirectly incident upon it, the light emitted from the surface-emitting film is reflected at least once by the components of the surface-emitting illumination panel (P) before being incident on the light-selective layer.

[0020] The surface-emitting film has a third main surface on the first main surface side, a fourth main surface on the second main surface side, and a light-receiving portion that receives light emitted from a light source, and emits light from at least the third main surface. The surface-emitting film may further emit light from the fourth main surface.

[0021] A portion of the light emitted from the third main surface passes through the light-selective layer and is emitted towards the first or second main surface. Of the light emitted from the third main surface, the light emitted towards the first main surface either passes through the light-selective layer without being reflected at all by the components of the surface-emitting illumination panel (P), or is reflected at least once by the components of the surface-emitting illumination panel (P) (including the light-selective layer) before passing through the light-selective layer. Of the light emitted from the third main surface, the light emitted towards the second main surface either is reflected at least once by the components of the surface-emitting illumination panel (P) before passing through the light-selective layer, or is emitted without passing through the light-selective layer.

[0022] Here, the optically selective layer satisfies the following conditions (a) and (b). (a) The total light reflectance of the photoselective layer is 20% or more and 90% or less. (b) The absorption rate of the photoselective layer is less than 10%.

[0023] In other words, light emitted from the third principal surface is transmitted or reflected by the light-selective layer with almost no absorption. From the viewpoint of enhancing the illumination effect of surface-emitting illumination (P), the absorption rate of the light-selective layer is preferably 5% or less, more preferably 3% or less, even more preferably 1% or less, and most preferably 0%.

[0024] With the above configuration, it is possible to design various colors and projected images for the lighting. Therefore, it becomes possible to provide surface-emitting lighting panels and surface-emitting lighting that are rich in design and entertainment value.

[0025] The total light reflectance, total light transmittance, and absorptance can be measured by the following methods.

[0026] <Total light reflectance> The total light reflectance can be measured using a UV-Vis-Near-Infrared spectrophotometer. Specifically, the UV-Vis-Near-Infrared Spectrophotometer UH4150 (manufactured by Hitachi High-Tech Science Corporation) can be used. Specifically, the wavelength range from 380 nm to 780 nm is measured at 5 nm intervals, and the spectral reflectance (measured value) of the object under test is multiplied by the spectral distribution of the C light source and the color matching function of the 2-degree field of view for each wavelength, and the total light reflectance (Y value) is obtained by integration.

[0027] <Total light transmittance> Total light transmittance can be measured using a UV-Vis-Near-Infrared spectrophotometer. Specifically, the UV-Vis-Near-Infrared Spectrophotometer UH4150 (manufactured by Hitachi High-Tech Science Corporation) can be used. Specifically, the wavelength range from 380 nm to 780 nm is measured at 5 nm intervals, and the spectral transmittance (measured value) of the object under test is multiplied by the spectral distribution of the C light source and the color matching function of the 2-degree field of view for each wavelength, and the total light transmittance (Y value) is obtained by integration.

[0028] <Absorption rate> Absorption rate (%) is the value obtained by subtracting the sum of total light reflectance and total light transmittance from 100%.

[0029] (2) In the surface-emitting lighting panel (P) described in (1) above, from the viewpoint of enhancing the lighting function and design of the surface-emitting lighting, (c) the total light transmittance of the light-selective layer is preferably 10% or more, and may be 20% or more. Furthermore, the total light transmittance of the light-selective layer is preferably 80% or less.

[0030] (3) When the light source is lit (ON), the ratio of the double-sided brightness of the surface-emitting lighting panel (P) described in (1) or (2) above to the double-sided brightness of the surface-emitting film is preferably 60% or more, may be 80% or more, and may also be 90% or more.

[0031] Brightness can be measured using the following method. <Brightness> Brightness can be measured using a luminance meter. Specifically, the LS-150 (manufactured by Konica Minolta Japan, Inc.) can be used as the measuring device. Brightness (cd / m²) is measured at three measurement areas from the light emission side at a distance of 1.5 m from the main surface of the object being measured (surface-emitting film, surface-emitting lighting, etc.). 2 The brightness on the main surface is obtained by measuring the luminance and averaging the obtained measurements. The three measurement areas are, for example, the center areas of each region obtained by dividing the main surface of the object under test into three equal parts along the long side. Brightness is measured on both sides of the object under test (front and back), and the sum of the brightness of both sides is calculated as the double-sided brightness.

[0032] (4) In the surface-emitting lighting panel (P) described in any one of (1) to (3) above, when the light source is off, it is preferable that the total light transmittance of the surface-emitting film is 80% or more.

[0033] In this case, when the light source is OFF, the transparency of the surface-emitting illumination panel (P) is high, allowing the viewer to see clearly from one side of the surface-emitting illumination panel (P) through the panel (P) to the other side. Therefore, it becomes possible to provide a surface-emitting illumination panel and surface-emitting illumination that are not only highly aesthetic or entertaining but also suitable for more practical applications.

[0034] (5) The surface-emitting lighting panel (P) described in any one of (1) to (4) above preferably has a haze of 10% or less when the light source is turned off (OFF state).

[0035] In this case, when the light source is off, the viewer can see through the surface-emitting illumination panel (P) from one side to the other side more vividly.

[0036] Haze can be measured in the following ways: <Hayes> Haze can be measured using a haze meter. A suitable measuring device is the HM-150 (manufactured by Murakami Color Technology Laboratory Co., Ltd.).

[0037] (6) In the surface-emitting illumination panel (P) described in any one of (1) to (5) above, the surface-emitting film may emit light from both the third main surface and the fourth main surface.

[0038] In this case, from the viewpoint of enhancing the aesthetic appeal of surface-emitting illumination by the light-selective layer, it is preferable that the luminous intensity of the light emitted from the third main surface is higher than the luminous intensity of the light emitted from the fourth main surface. The luminous flux density of the light emitted from the third main surface may be, for example, twice or more, or three times or more, the luminous flux density of the light emitted from the fourth main surface.

[0039] (7) In a surface-emitting illumination panel (P) described in any one of (1) to (6) above, a portion of the light emitted from the third main surface may pass through the light-selective layer and be emitted towards the first main surface, and the remaining portion of the light emitted from the third main surface may be reflected at least once by the light-selective layer and emitted towards the second main surface.

[0040] In this case, the light emitted to the first main surface may be reflected at least once by a component of the surface-emitting illumination panel (P) (for example, a surface-emitting film) before being transmitted through the light-selective layer.

[0041] Hereinafter, among surface-emitting illumination panels (P), a surface-emitting illumination panel (P) that emits light from both the first main surface side and the second main surface side will also be referred to as a "surface-emitting illumination panel (PD)".

[0042] (8) The surface-emitting illumination panel (P) described in any one of (1) to (6) above may further have a light-reflecting layer arranged so that light emitted from the third main surface is incident on it directly or indirectly.

[0043] In this case, the light-reflecting layer and the light-selective layer act as a mirror, enabling highly aesthetically pleasing multiple-image illumination. In other words, a surface-emitting illumination system that also functions as an infinity mirror is constructed.

[0044] (9) In the surface-emitting lighting panel (P) described in any one of (1) to (7) above, the light-reflecting layer may be a mirror layer, a half-mirror layer, or a dichroic film.

[0045] Using a mirror layer, an infinity mirror that is visible from only one of the first or second main surfaces can be obtained. Using a half-mirror layer or a dichroic film, an infinity mirror that is visible from both the first or second main surfaces can be obtained.

[0046] The total light reflectance of the mirror layer is, for example, 80% or more, may be 90% or more, or may be 100%. The mirror layer may be, for example, a film of silver, gold, aluminum, or an alloy containing one or more of these. A dielectric multilayer film may be used as the mirror layer. The mirror layer may be formed by techniques such as vapor deposition, plating, or coating.

[0047] A half-mirror layer is, for example, a mirror-like material that uniformly reflects and transmits light, and does not possess wavelength selectivity.

[0048] Dichroic films have the property of transmitting light of a specific wavelength and reflecting light of other wavelengths, i.e., wavelength selectivity.

[0049] Half-mirror layers and dichroic films differ in whether or not they exhibit wavelength selectivity, but they share the commonality of using dielectric multilayer films as their primary material. Dielectric multilayer films have a structure in which layers of two or more materials with different refractive indices are alternately stacked with a thickness at the wavelength level of light, and exhibit the above properties through the phenomenon of light interference. For example, TiO2 is an inorganic dielectric material with a high refractive index, and SiO2 is an inorganic dielectric material with a low refractive index. Polyethylene naphthalate is an example of a polymer with a high refractive index, and copolymer polyester is an example of a polymer with a low refractive index. Examples of dielectric multilayer films include PICASUS® manufactured by Toray Industries, Inc.

[0050] Hereinafter, surface-emitting illumination panels (P) that have a light-reflecting layer will also be referred to as "surface-emitting illumination panels (PM)".

[0051] A portion of the light emitted from the third principal surface is reflected at least once by the light-reflecting layer, then passes through the light-selective layer and is emitted towards the first principal surface or the second principal surface.

[0052] In a surface-emitting illumination panel (PM), the light-reflecting layer may be positioned on the third main surface side of the surface-emitting film. Alternatively, the light-selective layer may be positioned on the fourth main surface side of the surface-emitting film. In this case, light emitted from the third main surface directly enters the light-reflecting layer, and at least a portion of that light is reflected at least once by the light-reflecting layer before passing through the light-selective layer and emitting to the second main surface side.

[0053] In a surface-emitting illumination panel (PM), the light-reflecting layer may be positioned on the fourth main surface side of the surface-emitting film. Alternatively, the light-selective layer may be positioned on the third main surface side of the surface-emitting film. In this case, a portion of the light emitted from the third main surface is reflected at least once by the light-selective layer, then indirectly incident on the light-reflecting layer, and at least a portion of that light is reflected at least once by the light-reflecting layer, then transmitted through the light-selective layer and emitted on the first main surface side.

[0054] The surface-emitting film and the light-reflecting layer may be bonded together. A cured adhesive or a fluid adhesive may be interposed between the surface-emitting film and the light-reflecting layer.

[0055] Furthermore, a gap may exist between the surface-emitting film and the light-reflecting layer. By controlling the distance between the surface-emitting film and the light-reflecting layer (i.e., the width of the gap), it is possible to arbitrarily control the spacing between adjacent images in the multiplexed image. The distance between the surface-emitting film and the light-reflecting layer is not particularly limited, but for example, it may be within 10 cm, or between 1 cm and 5 cm.

[0056] (10) In the surface-emitting illumination panel (PM) described in either (8) or (9) above, the light-selective layer may be a half-mirror layer. A portion of the light incident on the half-mirror layer is transmitted through the half-mirror layer regardless of wavelength, and the other portion is reflected by the half-mirror layer. If the light incident on the half-mirror layer is white light, then both the transmitted light and the reflected light are white light.

[0057] When the light-selective layer is a half-mirror layer, the half-mirror layer and the light-reflecting layer form a mirrored arrangement. When the light source is lit (ON state), a portion of the light emitted from the third principal surface is repeatedly reflected by the light-reflecting layer and the half-mirror layer before being emitted towards the first or second principal surface. As a result, multiple images are formed. In other words, a surface-emitting illumination system that also functions as an infinity mirror can be constructed.

[0058] (11) In the surface-emitting illumination panel (P) described in any one of (1) to (8) above, the light-selective layer may be a dichroic film. Since the dichroic film transmits or reflects light but absorbs almost no light, the total amount of light emitted from both sides of the dichroic film is almost the same as the incident light. The absorption rate of the dichroic film is less than 10%, preferably less than 3%, and more preferably 1% or less.

[0059] Dichroic films have the property of transmitting light in a specific wavelength range and reflecting light in the remaining wavelength range. Furthermore, the color of the transmitted light can change depending on the direction of incidence of the light on the dichroic film.

[0060] When a dichroic film selectively reflects light with wavelengths of, for example, 560nm to 780nm within the visible light wavelength range of 380nm to 780nm, and transmits other light, if the color of the light emitted from the light source (light source color) is white, the reflected light will be orange and the transmitted light will be light blue.

[0061] When a dichroic film selectively reflects light with wavelengths of, for example, 430nm to 590nm within the visible light wavelength range of 380nm to 780nm, and transmits other light, if the light source is white, the reflected light will be light blue and the transmitted light will be orange.

[0062] When a dichroic film selectively reflects light with wavelengths of, for example, 490nm to 690nm within the visible light wavelength range of 380nm to 780nm, and transmits other light, if the light source is white, the reflected light will be yellow and the transmitted light will be blue.

[0063] When a dichroic film selectively reflects light with wavelengths of, for example, 580nm to 780nm within the visible light wavelength range of 380nm to 780nm, and transmits other light, if the light source is white, the reflected light will be orange and the transmitted light will be light blue.

[0064] In a surface-emitting illumination panel (PD), by using a dichroic film as the light-selective layer, a double-sided surface-emitting illumination panel can be obtained that emits light of different colors from the first main surface side and the second main surface side.

[0065] In a surface-emitting illumination panel (PM), by using a dichroic film as the light-selective layer, a surface-emitting illumination system that also functions as an infinity mirror, capable of emitting multiple images with changing colors as the depth increases, can be constructed.

[0066] (12) In the surface-emitting lighting panel (PD) described in (11) above, 80% or more of the light transmitted through the dichroic film may be in a complementary color relationship with the light reflected by the dichroic film.

[0067] When the color of the light emitted from the light source (light source color) is white, the light is separated into transmitted light and reflected light, which are complementary colors, resulting in vivid colors. In other words, a double-sided surface-emitting illumination panel is obtained that emits light of vivid complementary colors from both the first and second main surfaces.

[0068] In LED light sources, a wide range of colors can be expressed based on the principle of additive color mixing by individually controlling each RGBW (red, green, blue, white) LED chip. For example, a light blue (cyan) light source color can be expressed by simultaneously lighting B (450nm) and G (540nm). A pink (magenta) light source color can be expressed by simultaneously lighting B (450nm) and R (640nm).

[0069] Transmitted and reflected light do not necessarily have to be complementary colors. For example, if a dichroic film with a reflected wavelength of 560nm to 780nm is used and the light source color is cyan, the wavelength of the light source (450nm + 540nm) will be distributed only in the transmitted wavelength range, so the color visible on both sides of the surface-emitting illumination panel (PD) will be the same.

[0070] On the other hand, when using a dichroic film with a reflection wavelength of 560nm to 780nm and setting the light source color to pink (magenta), a portion of the light source's wavelength (450nm) is distributed as a transmitted wavelength (purple), while another portion (640nm) is distributed as a reflected wavelength (reddish-orange). As a result, the colors visible on both sides of the surface-emitting illumination panel (PD) will differ. Therefore, a double-sided surface-emitting illumination panel that emits vividly colored light can be obtained.

[0071] Even when the light source color is changed, a surface-emitting illumination panel (PM) can be configured to function as an infinity mirror, enabling multiple image emission where the color changes with depth, by using a dichroic film as the light-selective layer. For example, if the light source color is yellow, a surface-emitting illumination that functions as an infinity mirror, where the color gradually changes from green to orange, can be configured. If the light source color is pink, a surface-emitting illumination that functions as an infinity mirror, where the color gradually changes from purple to reddish-orange, can be configured.

[0072] (13) In the surface-emitting lighting panel (P) described in any one of (1) to (12) above, the surface-emitting film and the light-selective layer may be bonded together. A cured adhesive or a fluid adhesive may be interposed between the surface-emitting film and the light-selective layer.

[0073] (14) In the surface-emitting illumination panel (PM) described in (8) above, a gap may exist between the surface-emitting film and the light-selective layer. In the surface-emitting illumination panel (PM), the spacing between adjacent images in multiple images can be arbitrarily controlled by controlling the distance between the surface-emitting film and the light-selective layer (i.e., the width of the gap). The distance between the surface-emitting film and the light-selective layer is not particularly limited, but may be, for example, within 10 cm and may be between 1 cm and 5 cm.

[0074] (15) In the surface-emitting illumination panel (P) described in any one of (1) to (14) above, the distance between a part of the light-selective layer and the surface-emitting film may be different from the distance between another part of the light-selective layer and the surface-emitting film.

[0075] When the light-selective layer is a dichroic film, the color of the light perceived by the viewer changes depending on the viewing angle. Dichroic films utilize the phenomenon of light interference, which occurs when layers of two or more materials with different refractive indices are alternately stacked at a thickness corresponding to the wavelength of light, to selectively reflect light of a specific wavelength. As the viewing angle changes, the path length of the light changes, and therefore the wavelength reflected by interference changes. As a result, depending on the viewing angle, the viewer can perceive light with various colors that change on either the first or second principal surface side.

[0076] Methods for changing the reflection wavelength of the light-selective layer within a single surface-emitting lighting panel include, but are not limited to, providing recesses or protrusions in the light-selective layer, providing curved surfaces in the light-selective layer, or creating folds in the light-selective layer.

[0077] (16) In the surface-emitting illumination panel (P) described in any one of (1) to (15) above, the configuration of the surface-emitting film is not particularly limited. The surface-emitting film comprises, for example, a light guide layer through which light received by the light-receiving section propagates, and a light distribution control layer having a plurality of internal spaces. The plurality of internal spaces form an interface that directs a portion of the light propagating within the light guide layer toward the first main surface by internal total internal reflection, thereby the surface-emitting film selectively emits light from the third main surface.

[0078] (17) In the surface-emitting lighting panel (P) described in (16) above, the light distribution control layer may comprise, for example, a shaping film having a plurality of recesses and an adhesive layer that seals the plurality of recesses. In this case, the shaping film is bonded to the light guide layer or the substrate layer by the adhesive layer. The plurality of internal spaces are defined by the concave surfaces of the plurality of recesses and the adhesive layer.

[0079] Various designs can be expressed by attaching a shaping film of any shape to the light guide layer or substrate layer, or by cutting out a part of a shaping film of any shape. For example, if a part of the shaping film is cut out in the shape of a star, the cut-out part will not emit light, so when the light source is turned on, a star shape with depth will be visible on the screen of the surface-emitting lighting panel (P). Conversely, if a star-shaped shaping film is attached to the light guide layer or substrate layer, only the star-shaped part will emit light when the light source is turned on. Such designs significantly enhance the aesthetic appeal of surface-emitting lighting.

[0080] (18) A surface-emitting illumination according to the embodiment of the present disclosure (hereinafter also referred to as "surface-emitting illumination (P)") comprises a surface-emitting illumination panel (P) as described in any one of (1) to (17) above, and a light source that emits light toward a light-receiving section.

[0081] The light source emits light toward the light-receiving portion of the surface-emitting film provided by the surface-emitting illumination panel (P). The light that enters the light-receiving portion propagates through the light guide layer. A portion of the light propagating within the light guide layer undergoes total internal reflection at the interfaces formed by multiple internal spaces of the light distribution control layer and is directed toward the first main surface, where it is emitted from the third main surface.

[0082] Figure 1 is a schematic cross-sectional view of an example of a surface-emitting film having a first main surface M1 and a second main surface M2 on the opposite side. Figure 1 shows a sheet-shaped surface-emitting film 12 having a third main surface M3 on the side of the first main surface and a fourth main surface M4 on the opposite side. The surface-emitting film 12 comprises a light guide layer 10 made of, for example, an acrylic resin plate, and an orientation control layer 20. The orientation control layer 20 comprises a base layer 30, a shaping film 22 in which an internal space 22A that refracts light is formed, an adhesive layer (or tack layer) 40 that adheres the light guide layer 10 and the base layer 30, and an adhesive layer (or tack layer) 50 that adheres the base layer 30 and the shaping film 22.

[0083] Multiple internal spaces 22A form interfaces that direct a portion of the light propagating within the light guide layer 10 toward the third principal surface (first principal surface) by total internal reflection (TIR). By adjusting the cross-sectional shape, size, arrangement density, and distribution of the internal spaces 22A, the light distribution of the light emitted from the third principal surface M3 of the surface-emitting film 12 can be controlled. For example, it is possible to emit highly directional light by reducing the directional angle (half-power angle) of the light emitted from the third principal surface M3 of the surface-emitting film 12. The directional angle with respect to the normal direction of the third principal surface may be, for example, 20° or more and 70° or less, or 24° or more and 67° or less.

[0084] The internal space 22A is typically an air cavity filled with air. Furthermore, the visible light transmittance and haze value of the surface-emitting film 12 can be controlled by adjusting the cross-sectional shape, size, arrangement density, and distribution of the internal space 22A. The total light transmittance of the surface-emitting film 12 is preferably 80% or higher, and the haze value is preferably 10% or lower.

[0085] A light-receiving section E2 is provided on one end face of the surface-emitting film 12 (more specifically, the light guide layer 10), and a light source LS, such as an LED, is positioned adjacent to the light-receiving section E2. In Figure 1, the light-receiving section E2 is the end face of the light guide layer 10 on the side of the light source LS. Light emitted from the light source LS enters the light-receiving section E2, propagates within the light guide layer 10, is refracted at the interface of the cavity 22A of the orientation control layer 20, and is emitted from the third main surface M3. Light that does not reach the third main surface M3 may be emitted from the other end face E1 of the surface-emitting film 12 (more specifically, the light guide layer 10), or from yet another end face. In addition, some of the light may be emitted from the fourth main surface M4 in addition to the third main surface M3.

[0086] When the surface-emitting film 12 is viewed from the normal direction of the third main surface M3, the ratio of the area of ​​the multiple internal spaces 22A to the area of ​​the light guide layer 10 (occupancy rate) is preferably, for example, 1% or more and 80% or less, and more preferably 1% or more and 50% or less. From the viewpoint of obtaining a low haze value, the occupancy rate of the internal spaces IS is preferably 30% or less, and more preferably 10% or less.

[0087] <First Embodiment> Figure 2 shows a schematic cross-sectional view of an example of the structure of a surface-emitting illuminator (PD) 11A according to the first embodiment. In Figure 2 and subsequent drawings, the orientation control layer 20 is shown in a simplified manner.

[0088] The surface-emitting illuminator (PD) 11A has a first main surface M1 and a second main surface M2 opposite to the first main surface. In Figure 2, the main surface on the right is the first main surface M1, and the main surface on the left is the second main surface M2. The surface-emitting illuminator (P) 11A comprises a surface-emitting film (P) 12, a light-selective layer 13A, and a light source LS. The light-selective layer 13A is a dichroic film.

[0089] The surface-emitting illumination (PD) 11A has the function of illuminating the first main surface M1 and the second main surface M2 when the light source LS is lit (ON state). The light source LS is, for example, an LED device. Multiple LED devices may be used as the light source LS. The multiple LED devices are arranged, for example, along the X direction.

[0090] The surface-emitting film 12 has a third main surface M3 on the first main surface side M1, a fourth main surface M4 on the second main surface side M2, and a light-receiving section E2, and emits light from the third main surface. The surface-emitting film 12 receives light emitted from the light source LS at the light-receiving section E2, propagates the light in the Z direction, and emits light on both the Y direction and the -Y direction. The direction of light propagation may have variation (distribution) from the Z direction, and the direction of light emission may also have variation (distribution) from the Y direction (-Y direction).

[0091] The light-selective layer 13A is positioned on the third main surface M3 side of the surface-emitting film 12, and light emitted from the surface-emitting film 12 is directly incident on it. A portion of the light emitted from the third main surface M3 passes through the light-selective layer 13A and is emitted on the first main surface M1 side, while another portion of the light emitted from the third main surface is reflected by the light-selective layer 13A and is emitted on the second main surface M2 side. Since the light-selective layer 13A is a dichroic film, the light emitted from the first main surface M1 and the light emitted from the second main surface M2 have different wavelength ranges and exhibit different colors.

[0092] <Second Embodiment> Figure 3 shows a schematic cross-sectional view of the surface-emitting illumination (PM) 11B according to the second embodiment. The surface-emitting illumination (PM) 11B has a first main surface M1 and a second main surface M2 opposite to the first main surface. In Figure 3, the main surface on the right is the first main surface M1, and the main surface on the left is the second main surface M2. The surface-emitting illumination (PM) 11B comprises a surface-emitting film 12, a light-selective layer 13B, a mirror layer 14, and a light source LS. The light-selective layer 13A is a half-mirror layer. The light source LS is the same as in the first embodiment in Figure 2, for example, a plurality of LED devices are arranged along the X direction.

[0093] The surface-emitting film 12 has a third main surface M3 on the first main surface side M1, a fourth main surface M4 on the second main surface side M2, and a light-receiving section E2, and emits light from the third main surface. The mirror layer 14 is located on the third main surface M3 side of the surface-emitting film 12, and light emitted from the surface-emitting film 12 is directly incident on it. The light-selective layer 13B is located on the fourth main surface M4 side of the surface-emitting film 12, and light reflected by the mirror layer 14 is incident on it.

[0094] The surface-emitting illumination (PM) 11B has the function of illuminating the second main surface M2 when the light source LS is lit (ON state). On the other hand, when the light source LS is turned off (OFF state), the surface-emitting illumination (PM) 11B functions as a mirror. The light-selective layer 13B, which consists of a half-mirror layer and a mirror layer 14, forms a double mirror. When the light source LS is lit (ON state), a portion of the light emitted from the third main surface is reflected by the mirror layer 14, then passes through the half-mirror layer and is emitted towards the second main surface. The remaining portion of the light emitted from the third main surface is reflected by the half-mirror layer towards the first main surface and is further reflected by the mirror layer 14. Multiple images are formed by this repetition of incidence and reflection.

[0095] <Third Embodiment> Figure 4 shows a schematic cross-sectional view of the surface-emitting illumination (PM) 11C according to the third embodiment. The surface-emitting illumination (PM) 11C has a first main surface M1 and a second main surface M2 opposite to the first main surface. In Figure 4, the main surface on the right is the first main surface M1, and the main surface on the left is the second main surface M2. The surface-emitting illumination (P) 11C comprises a surface-emitting film 12, a light-selective layer 13C, a mirror layer 14, and a light source LS. The light-selective layer 13C is a dichroic film. The light source LS is the same as in the first embodiment in Figure 2, for example, a plurality of LED devices are arranged along the X direction.

[0096] The surface-emitting film 12 has a third main surface M3 on the first main surface side M1, a fourth main surface M4 on the second main surface side M2, and a light-receiving section E2, and emits light from the third main surface. The mirror layer 14 is located on the third main surface M3 side of the surface-emitting film 12, and light emitted from the surface-emitting film 12 is directly incident on it. The light-selective layer 13 is located on the fourth main surface M4 side of the surface-emitting film 12, and light reflected by the mirror layer 14 is incident on it.

[0097] The surface-emitting illumination (PM) 11C has the function of illuminating the second main surface M2 when the light source LS is lit (ON state). On the other hand, when the light source LS is off (OFF state), the surface-emitting illumination (PM) 11C functions as a mirror. Since the light-selective layer 13C is a dichroic film, only light in a specific wavelength range is emitted to the second main surface M2 side. Also, since the dichroic film reflects light in other wavelength ranges, the dichroic film, which is the light-selective layer 13C, and the mirror layer 14 form a mirror. When the light source LS is lit (ON state), a portion of the light emitted from the third main surface M3 is reflected by the mirror layer 14, then passes through the dichroic film and is emitted to the second main surface M2 side as light of a specific color. The remaining light emitted from the third main surface M3 is reflected by the dichroic film and heads towards the first main surface M1 side, and is further reflected by the mirror layer 14. Through this repeated process of incidence and reflection, multiple images are formed in which the colors change along with the depth.

[0098] <Fourth Embodiment> Figure 5A is a schematic cross-sectional view of a modified example of the surface-emitting illumination (P) 11A according to the first embodiment. Here, the light-selective layer 13A is curved in a convex arc shape toward the first main surface. As a result, the distance between the light-selective layer 13A and the surface-emitting film 12 changes within a single surface-emitting illumination panel (P) 11A. The shape of the light-selective layer 13A is not particularly limited, and various variations are possible.

[0099] For example, as shown in Figure 5B, it may be an arc shape with a convex fold on the first main surface side, or as shown in Figure 5C, it may be a trapezoidal shape with a convex fold on the first main surface side. In these examples, the viewing angle changes depending on the part of the light-selective layer 13A, so vivid color changes can be expressed.

[0100] Figures 5A to 5C represent only a few embodiments, and various other forms are possible. For example, the light-selective layer 13A may be formed in a corrugated shape, or it may have a concave shape on the first main surface side. Alternatively, the surface-emitting film 12 may have a curved surface or folds instead of the light-selective layer 13A, or both the light-selective layer 13A and the surface-emitting film 12 may have curved surfaces or folds.

[0101] [Examples] The surface-emitting film (P) and surface-emitting illumination (P) according to the present invention will be described in detail below based on examples and comparative examples. However, the present invention is not limited to the following examples.

[0102] Examples 1-4 Using a surface-emitting film that emits white light and dichroic films (DC1 to DC4) having the optical properties shown in Table 1, the following surface-emitting illuminators (PDs) ED1 to ED4 were fabricated as surface-emitting illuminators (PDs) according to the first embodiment. An LED device was used as the light source.

[0103] The surface-emitting film used was a laminate of a shaping film (RAYCREA manufactured by Nitto Denko Corporation) and an acrylic resin plate. The luminance on the third main surface side of the surface-emitting film was 853 cd / m². 2 The luminance of the fourth main surface side of the surface-emitting film is 238 cd / m². 2 (Brightness on both sides: 1091 cd / m²) 2 )

[0104] Comparative Example 1 A surface-emitting illumination CD1 was fabricated in the same manner as in Examples 1 to 4, except that a blue color film with the optical properties shown in Table 1 was used instead of a dichroic film.

[0105] Table 1 shows the luminance on both sides, the ratio (luminance maintenance rate) of the luminance on both sides of the surface light-emitting illumination panel to the luminance on both sides of only the surface light-emitting film when the light source is in the lit state, and the color of light on the first major surface and the second major surface.

[0106]

Table 1

[0107] For the surface light-emitting illumination ED1 of Example 1, when the light source is OFF, both the first major surface M1 and the second major surface M2 are blue translucent, and each major surface also functions as a mirror surface. When the light source is ON, the first major surface emits light in light blue (luminance: 528 cd / m 2 ), and the second major surface emits light in orange (luminance: 481 cd / m 2 ).

[0108] For the surface light-emitting illumination ED2 of Example 2, when the light source is OFF, both the first major surface M1 and the second major surface M2 are orange translucent, and each major surface also functions as a mirror surface. When the light source is ON, the first major surface emits light in orange (luminance: 578 cd / m 2 ), and the second major surface emits light in light blue (luminance: 440 cd / m 2 ).

[0109] For the surface light-emitting illumination ED3 of Example 3, when the light source is OFF, both the first major surface M1 and the second major surface M2 are light blue translucent, and each major surface also functions as a mirror surface. When the light source is ON, the first major surface emits light in blue (luminance: 61 cd / m 2 ), and the second major surface emits light in yellow (luminance: 873 cd / m 2 ).

[0110] For the surface light-emitting illumination ED4 of Example 4, when the light source is OFF, both the first major surface M1 and the second major surface M2 are light blue translucent, and each major surface also functions as a mirror surface. When the light source is ON, the first major surface emits light in light blue (luminance: 266 cd / m 2 ), and the second major surface emits light in orange (luminance: 479 cd / m 2 ).

[0111] As described above, the surface-emitting illuminators ED1 to ED4 of Examples 1 to 4 all exhibited high brightness on both sides and emitted vividly colored light when the light source was ON, demonstrating high aesthetic appeal. Furthermore, when the light source was OFF, at least one of the main surfaces functioned as a semi-transparent mirror, providing a highly entertaining experience. On the other hand, the surface-emitting illuminator CD1 of Comparative Example 1 had low brightness on both sides, did not function as a mirror, and emitted a uniform blue color regardless of which main surface it was viewed from.

[0112] Example 5 A surface-emitting lamp EM5 according to the second embodiment was fabricated using a surface-emitting film that emits white light, a half-mirror layer HM1 having the optical properties shown in Table 2, and a mirror layer with a total light reflectance of 90%. An LED device was used as the light source. The mirror layer was placed on the third main surface side of the surface-emitting film, and the half-mirror layer HM1 was placed on the fourth main surface side of the surface-emitting film.

[0113] The surface-emitting film is a laminate of the same shaped film and acrylic resin plate as in Examples 1-4 (double-sided brightness: 1091 cd / m²). 2 ) was used.

[0114] Comparative Example 2 A surface-emitting illuminator CM2 was fabricated in the same manner as in Example 5, except that a half-mirror layer HM2 having the optical properties shown in Table 2 was used.

[0115] [Table 2]

[0116] In Example 5, the surface-emitting illumination EM5 functioned as a mirror surface when the light source was OFF. When the light source was ON, the second main surface emitted white light, and when viewed from an oblique direction relative to the normal of the second main surface M2, multiple images were formed, and it functioned as an infinity mirror.

[0117] In Comparative Example 2, the surface-emitting illumination CM2 functioned as a mirror surface on the second principal surface M2 when the light source was OFF, and emitted white light when the light source was ON. However, no multiple images were formed even when viewed from an oblique direction relative to the normal of the second principal surface M2.

[0118] From the above, it was confirmed that in order to create an infinity mirror with a high aesthetic appeal, it is necessary to use a light-selective layer (half-mirror layer) with a total light reflectivity of 20% or more.

[0119] Examples 6-9 Using a surface-emitting film that emits white light, dichroic films (DC1 to DC4) having the optical properties shown in Table 3, and a mirror layer with a total light reflectance of 90%, the following surface-emitting illuminations EM6 to EM9 were fabricated as surface-emitting illuminations (PMs) according to the third embodiment. An LED device was used as the light source.

[0120] The surface-emitting film is a laminate of the same shaped film and acrylic resin plate as in Examples 1-4 (double-sided brightness: 1091 cd / m²). 2 ) was used.

[0121] [Table 3]

[0122] In Example 6, the surface-emitting illumination EM6 functioned as a mirror surface with a mixture of light blue and orange light on its second principal surface M2 when the light source was OFF. When the light source was ON, the second principal surface emitted light blue light, and when viewed from an oblique direction relative to the normal of the second principal surface M2, a multiple image was formed in which the color changed from light blue to orange, thus functioning as an infinity mirror.

[0123] In Example 7, the surface-emitting illumination EM7 functioned as a mirror surface with a mixture of light blue and orange light on its second principal surface M2 when the light source was OFF. When the light source was ON, the second principal surface emitted orange light, and when viewed from an oblique direction relative to the normal of the second principal surface M2, a multiple image was formed in which the color changed from orange to light blue, thus functioning as an infinity mirror.

[0124] In Example 8, the surface-emitting illumination EM8 functioned as a mirror surface with a mixture of blue and yellow light on its second principal surface M2 when the light source was OFF. When the light source was ON, the second principal surface emitted blue light, and when viewed from an oblique direction relative to the normal of the second principal surface M2, a multiple image was formed in which the color changed from blue to yellow, thus functioning as an infinity mirror.

[0125] In Example 9, the surface-emitting illumination EM9 functioned as a mirror surface with a mixture of light blue and orange light on its second principal surface M2 when the light source was OFF. When the light source was ON, the second principal surface emitted light blue light, and when viewed from an oblique direction relative to the normal of the second principal surface M2, a multiple image was formed in which the color changed from light blue to orange, thus functioning as an infinity mirror.

[0126] As described above, the surface-emitting illuminators EM6 to EM9 of Examples 6 to 9 all possessed high design quality and were highly entertaining when the light source was ON. [Industrial applicability]

[0127] This disclosure can be used for surface-emitting lighting panels and surface-emitting lighting. [Explanation of Symbols]

[0128] 10 Light guide layer 11-sided illuminated lighting 12-sided light-emitting film 20 Orientation control layer 22 Shaping film 22A Internal space 30 Base material layer 40 Adhesive layer (or adhesive layer) 50 Adhesive layer (or adhesive layer) LS:Light source

Claims

1. A surface-emitting illumination panel having a first main surface and a second main surface opposite to the first main surface, Surface-emitting film and A light-selective layer is arranged so that light emitted from the surface-emitting film is directly or indirectly incident upon it, Equipped with, The surface-emitting film has a third main surface on the first main surface side, a fourth main surface on the second main surface side, and a light-receiving portion that receives light emitted from a light source, and emits light from at least the third main surface. A portion of the light emitted from the third main surface passes through the light-selective layer and is emitted towards the first main surface or the second main surface. (a) The total light reflectance of the light-selective layer is 20% or more and 90% or less, and (b) A surface-emitting lighting panel in which the absorption rate of the light-selective layer is less than 10%.

2. (c) The surface-emitting illumination panel according to claim 1, wherein the total light transmittance of the light-selective layer is 10% or more.

3. (d) When the light source is lit, the ratio of the double-sided brightness to the double-sided brightness of the surface-emitting film is 60% or more, the surface-emitting lighting panel according to claim 1.

4. (e) The surface-emitting lighting panel according to claim 1, wherein the total light transmittance of the surface-emitting film is 80% or more when the light source is turned off.

5. (f) The surface-emitting illumination panel according to claim 1, wherein the haze is 10% or less when the light source is turned off.

6. The surface-emitting film emits light from both the third main surface and the fourth main surface, The surface-emitting illumination according to claim 1, wherein the luminous intensity of the light emitted from the third main surface is higher than the luminous intensity of the light emitted from the fourth main surface.

7. A portion of the light emitted from the third main surface passes through the light-selective layer and is emitted towards the first main surface. The surface-emitting illumination panel according to claim 1, wherein the remaining portion of the light emitted from the third main surface is reflected at least once by the light-selective layer and emitted towards the second main surface.

8. The device further comprises a light-reflecting layer arranged so that light emitted from the third main surface is incident on it directly or indirectly. A surface-emitting illumination panel according to claim 1, wherein a portion of the light emitted from the third main surface is reflected at least once by the light-reflecting layer, then passes through the light-selecting layer and is emitted towards the first main surface side or the second main surface side.

9. The surface-emitting lighting panel according to claim 8, wherein the light-reflecting layer is a mirror layer, a half-mirror layer, or a dichroic film with a total light reflectance of 80% or more.

10. The surface-emitting illumination panel according to claim 8, wherein the light-selective layer is a half-mirror layer.

11. The surface-emitting illumination panel according to claim 1, wherein the light-selective layer is a dichroic film.

12. The surface-emitting illumination panel according to claim 11, wherein 80% or more of the light transmitted through the light-selective layer is in a complementary color relationship with the light reflected by the light-selective layer.

13. The surface-emitting illumination panel according to claim 1, wherein the surface-emitting film and the light-selective layer are bonded together.

14. The surface-emitting illumination panel according to claim 1, wherein a gap exists between the surface-emitting film and the light-selective layer.

15. The surface-emitting illumination panel according to claim 1, wherein the distance between a portion of the light-selective layer and the surface-emitting film is different from the distance between another portion of the light-selective layer and the surface-emitting film.

16. The aforementioned surface-emitting film is A light guide layer through which light received by the light receiving unit propagates, A light distribution control layer having multiple internal spaces, It is equipped with, The surface-emitting illumination panel according to claim 1, wherein the plurality of internal spaces form interfaces that direct a portion of the light propagating within the light guide layer toward the third main surface side by total internal reflection.

17. The light distribution control layer is, A shaped film having multiple recesses, An adhesive layer that fills the plurality of recesses, It is equipped with, The shaping film is bonded to the light guide layer or the substrate layer by the adhesive layer. The surface-emitting lighting panel according to claim 16, wherein the plurality of internal spaces are defined by the concave surfaces of the plurality of recesses and the adhesive layer.

18. A surface-emitting illumination panel according to claim 1, A light source that emits light toward the light receiving unit, A surface-emitting light source equipped with the following features.

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