Light guide member for lighting device, lighting device, and architectural member

Abstract

The light guide member for a lighting device has a light guide layer having a first main surface, a second main surface on the opposite side of the first main surface, and a light receiving side surface that receives light emitted from a light source; a first low refractive index layer (20A) disposed on the first main surface side of the light guide layer, having a refractive index n GP a small refractive index n L1 ; a light distribution control structure (14A, 14B) capable of causing a portion of light propagating within the light guide layer to at least one of the first low refractive index layer side or the opposite side of the first low refractive index layer; a visible light transmittance of 60% or more, and a haze value of less than 10%.

Description

Technical Field

[0001] This invention relates to light guide components for lighting devices, lighting devices, and building components, particularly to sheet-like or film-like transparent light guide components for lighting devices, and lighting devices and building components incorporating such light guide components. Furthermore, the building components include those for exterior decoration and those for interior decoration. Background Technology

[0002] In recent years, the use of next-generation semiconductor lighting (Solid State Light: SSL), represented by LED lighting, has been developing. For example, proposals have emerged for architectural lighting, which combines architectural components and lighting fixtures to create design-oriented or entertaining lighting.

[0003] For example, Patent Document 1 discloses a single-sided lighting window that has a light source at the end of a plate-shaped transparent substrate. When illuminated at night, it functions as an illumination device that emits light from the light source and guides the light within the transparent substrate from one side of the transparent substrate, and when not illuminated during the day, it functions as a transparent window.

[0004] In the lighting device described in Patent Document 1, such as a single-sided lighting window, multiple reflective concave surfaces (or convex surfaces) are formed on one main surface of a transparent substrate, and light that is guided within the transparent substrate and reflected by the multiple reflective concave surfaces (or convex surfaces) is emitted from the other main surface.

[0005] Such multiple reflective concave (or convex) surfaces are prone to accumulating dirt or dust, or are easily damaged. In addition, it may be difficult to perform light distribution control (control of the distribution of the illumination light direction) based on multiple reflective concave (or convex) surfaces; or it may be impossible to obtain sufficient transmittance for visible light (hereinafter referred to as "visible light transmittance"), for example, it may appear cloudy like frosted glass.

[0006] On the other hand, in Patent Literature 2, there is disclosed an optical device having an optical medium layer (for example, an image display such as a poster, a reflective display, electronic paper, or a transparent window or wall) and a transparent illuminating device that irradiates light to the optical medium layer. The transparent illuminating device has a light guide layer, a low refractive index layer disposed on the observer side of the light guide layer, and an optical function layer (a low refractive index layer or a layer having a plurality of cavities) provided between the light guide layer and the optical medium layer. The transparent illuminating device described in Patent Literature 2 does not have a reflective concave surface (or a convex surface) on the outermost surface. In addition, because of the low refractive index layer disposed on the observer side, even if dirt is attached to the surface thereof, light does not leak therefrom. In addition, in Patent Literature 3, there is disclosed an LED illuminating appliance including a light guide layer, a low refractive index layer, and a base material layer. Even if dirt is attached to the surface of the illuminating appliance of Patent Literature 3, the waveguide effect of light does not decrease.

[0007] In addition, in Patent Literatures 4 and 5, there is disclosed a light distribution structure that utilizes total reflection at the interface of a plurality of cavities. If the light distribution structure disclosed in Patent Literatures 4 and 5 is used, the degree of freedom and the precision of light distribution control can be improved.

[0008] The entire disclosures of Patent Literatures 2 to 5 are incorporated herein by reference.

[0009] Prior Art Documents

[0010] Patent Literature

[0011] Patent Literature 1: International Publication No. 2019 / 102959

[0012] Patent Literature 2: International Publication No. 2019 / 182091

[0013] Patent Literature 3: International Publication No. 2019 / 146628

[0014] Patent Literature 4: International Publication No. 2011 / 124765

[0015] Patent Literature 5: International Publication No. 2019 / 087118

[0016] Patent Literature 6: (Japanese) Patent Application Publication No. 2001-215312 SUMMARY

[0017] PROBLEMS TO BE SOLVED BY THE INVENTION

[0018] The existing transparent lighting device can be used for, for example, a window, a wall, but has limitations in use due to low transmittance or cloudiness (high haze value) and the like. As the prior art, there is a method of forming a dot pattern on a light guide plate to extract light, but in this method, the transparency is not sufficient with respect to the normal direction. Furthermore, there are problems that the surface is easily contaminated, easily damaged, or the optical characteristics are greatly changed due to contamination or damage. In addition, depending on the use environment, condensation can occur on the surface, and as a result, a problem of dirt adhering to the surface can occur. In Patent Document 6, an optical film including a layer having a plurality of groove structures having a light path conversion inclined surface, a cover film, and an anti-fouling layer is disclosed, but this cannot ensure sufficient transparency.

[0019] The present application was completed in order to solve at least one of the above-described problems of the existing transparent lighting device, and aims to provide a lighting device having, for example, higher transmittance and a smaller haze value than the prior art, and a light guide member for a lighting device. In addition, the present application aims to provide a building member provided with such a lighting device.

[0020] Means for solving the technical problem

[0021] According to the embodiment of the present application, the following items are provided.

[0022] [Item 1]

[0023] A light guide member for a lighting device, having:

[0024] a light guide layer having a first main surface, a second main surface on the opposite side of the first main surface, and a light receiving side surface that receives light emitted from a light source;

[0025] a first low refractive index layer disposed on the first main surface side of the light guide layer, having a refractive index n GP lower than the refractive index n L1 of the light guide layer;

[0026] a light distribution control structure capable of causing a part of light propagating in the light guide layer to at least be directed toward the first low refractive index layer side or the opposite side of the first low refractive index layer,

[0027] a visible light transmittance of 60% or more and a haze value of less than 10%.

[0028] [Item 2]

[0029] The light guide member for a lighting device according to item 1, wherein:

[0030] the light distribution control structure causes a part of light propagating in the light guide layer to be directed at least toward the first low refractive index layer side.

[0031] [Item 3]

[0032] The light guide member for a lighting device according to any one of items 1 to 3, wherein

[0033] The light distribution control structure causes a part of the light propagating in the light guide layer to be at least directed toward the side opposite to the first low refractive index layer side.

[0034] [Item 4]

[0035] The light guide member for a lighting device according to any one of items 1 to 3, wherein

[0036] Further having a first hard coat layer provided on the side of the first low refractive index layer opposite to the light guide layer, and having a hardness of a pencil hardness H or more.

[0037] [Item 5]

[0038] The light guide member for a lighting device according to any one of items 1 to 4, wherein

[0039] Further having a first substrate layer on the side of the first low refractive index layer opposite to the light guide layer, and the first hard coat layer is formed on the side of the first substrate layer opposite to the first low refractive index layer. The refractive index n of the first low refractive index layer L1 For example, 1.05 or more and 1.30 or less.

[0040] [Item 6]

[0041] The light guide member for a lighting device according to any one of items 1 to 5, wherein

[0042] The light distribution control structure has a plurality of internal spaces in which interfaces that cause light to be directed toward the first low refractive index layer side or the side opposite to the first low refractive index layer side by internal total reflection are formed.

[0043] [Item 7]

[0044] The light guide member for a lighting device according to item 6, wherein

[0045] The light distribution control structure includes a first light distribution control structure in which the plurality of internal spaces are formed in the light guide layer.

[0046] [Item 8]

[0047] The light guide member for a lighting device according to item 6, wherein

[0048] The light distribution control structure includes a second light distribution control structure formed on a first direction conversion layer in which the plurality of internal spaces are provided between the light guide layer and the first low refractive index layer.

[0049] [Item 9]

[0050] The light guide member for a lighting device according to Item 8, wherein

[0051] further comprising a first light coupling layer provided between the light guide layer and the first direction conversion layer, the first light coupling layer having a plurality of first low refractive index regions having a refractive index n GP smaller than a refractive index n C1 of the light guide layer.

[0052] [Item 10]

[0053] The light guide member for a lighting device according to Item 6, wherein

[0054] the light distribution control structure includes a third light distribution control structure formed in a second direction conversion layer provided with the plurality of internal spaces on the second main surface of the light guide layer.

[0055] [Item 11]

[0056] The light guide member for a lighting device according to any one of Items 6 to 10, wherein

[0057] in terms of the plurality of internal spaces, a proportion of an area of the plurality of internal spaces to an area of the light guide layer is 30% or less when the light guide layer is viewed from a normal direction of the first main surface.

[0058] [Item 12]

[0059] The light guide member for a lighting device according to any one of Items 1 to 11, wherein

[0060] further comprising a second low refractive index layer disposed on the second main surface side of the light guide layer, having a refractive index n GP smaller than a refractive index n L2。

[0061] [Item 13]

[0062] The light guide member for a lighting device according to Item 12, wherein

[0063] further comprising a second hard coat layer disposed on the second low refractive index layer side opposite to the light guide layer, having a hardness H GP higher than a hardness H H2 of the light guide layer. The hardness H H2 is, for example, H or more in terms of a pencil hardness.

[0064] [Item 14]

[0065] The light guide member for a lighting device according to item 13, wherein

[0066] The second low-refractive layer has a second substrate layer on the side opposite to the light guide layer, and the second hard coat layer is formed on the side of the second substrate layer opposite to the second low-refractive layer.

[0067] The refractive index of the second low-refractive layer is, for example, 1.05 or more and 1.30 or less. The second low-refractive layer having a refractive index of 1.30 or less is formed using, for example, a porous material, and thus has a hardness H L2 lower than the hardness H GP of the light guide layer, and thus the second low-refractive layer is brittle.

[0068] [Item 15]

[0069] The light guide member for a lighting device according to item 10, wherein

[0070] Further has a second light coupling layer provided between the light guide layer and the second direction conversion layer, the second light coupling layer has a plurality of second low-refractive regions, the plurality of second low-refractive regions have a refractive index n GP smaller than the refractive index n C2 of the light guide layer.

[0071] [Item 16]

[0072] The light guide member for a lighting device according to item 13 or 14, wherein

[0073] The haze value of the first hard coat layer is larger than the haze value of the second hard coat layer. The first hard coat layer and / or the second hard coat layer contains, for example, particles.

[0074] [Item 17]

[0075] The light guide member for a lighting device according to any one of items 1 to 16, wherein

[0076] Further has a stain-proof layer having water repellency and / or oil repellency (or hydrophilicity) as the outermost layer on the first main surface side or the second main surface side.

[0077] [Item 18]

[0078] The light guide member for a lighting device according to claim 17, wherein

[0079] Further has an anti-reflection layer provided on the light guide layer side of the stain-proof layer.

[0080] [Item 19]

[0081] A lighting device comprising:

[0082] The light guide member for a lighting device according to any one of items 1 to 18, and

[0083] A light source that emits light toward the light-receiving side surface.

[0084] [Item 20]

[0085] A building component having the light guide member for a lighting device according to any one of items 1 to 18.

[0086] Effects of the Invention

[0087] According to the embodiment of the present application, a lighting device having a higher transmittance and a smaller haze value than conventional lighting devices is provided. In addition, according to another embodiment of the present application, a building component having such a lighting device is provided. BRIEF DESCRIPTION OF DRAWINGS

[0088] Figure 1A is a schematic cross-sectional view of a lighting device 100A_L according to an embodiment of the present application.

[0089] Figure 1B is a schematic cross-sectional view of a lighting device 100B_L according to an embodiment of the present application.

[0090] Figure 2A is a schematic cross-sectional view of a lighting device 200A_L according to an embodiment of the present application.

[0091] Figure 2B is a schematic cross-sectional view of a lighting device 200B_L according to an embodiment of the present application.

[0092] Figure 3 is a schematic cross-sectional view of a lighting device 300A_L according to an embodiment of the present application.

[0093] Figure 4A is a schematic cross-sectional view of a light guide member 100A according to an embodiment of the present application.

[0094] Figure 4B is a schematic cross-sectional view of a light guide member 100B according to an embodiment of the present application.

[0095] Figure 5A is a schematic cross-sectional view of a light guide member 200A according to an embodiment of the present application.

[0096] Figure 5B is a schematic cross-sectional view of a light guide member 200B according to an embodiment of the present application.

[0097] Figure 6A is a schematic cross-sectional view of a light guide member 210A according to an embodiment of the present application.

[0098] Figure 6B FIG. 21OB is a schematic cross-sectional view of a light guide member 210B according to an embodiment of the present application.

[0099] Figure 7A FIG. 22OA is a schematic cross-sectional view of a light guide member 220A according to an embodiment of the present application.

[0100] Figure 7B FIG. 22OB is a schematic cross-sectional view of a light guide member 220B according to an embodiment of the present application.

[0101] Figure 8 FIG. 10OAD is a schematic cross-sectional view of a light guide member 100AD according to an embodiment of the present application.

[0102] Figure 9 FIG. 21OAD is a schematic cross-sectional view of a light guide member 210AD according to an embodiment of the present application.

[0103] Figure 10 FIG. 20OAD is a schematic cross-sectional view of a light guide member 200AD according to an embodiment of the present application.

[0104] Figure 11 FIG. 22OAD is a schematic cross-sectional view of a light guide member 220AD according to an embodiment of the present application.

[0105] Figure 12A FIG. 20OAD_a is a schematic cross-sectional view of a light guide member 200AD_a according to an embodiment.

[0106] Figure 12B FIG. 20OBDA_a is a schematic cross-sectional view of a light guide member 200BD_a according to an embodiment.

[0107] Figure 13A FIG. 22OAD_a is a schematic cross-sectional view of a light guide member 220AD_a according to an embodiment.

[0108] Figure 13B FIG. 22OAD_b is a schematic cross-sectional view of a light guide member 220AD_b according to an embodiment.

[0109] Figure 13C FIG. 22OBDA_b is a schematic cross-sectional view of a light guide member 220BD_b according to an embodiment.

[0110] Figure 14A FIG. 62 is a schematic plan view of a shaped film 62 of a direction converting layer which a light guide member according to an embodiment of the present application has.

[0111] Figure 14B FIG. 63 is a schematic cross-sectional view of the shaped film 62.

[0112] Figure 15 FIG. 64 is a schematic cross-sectional view showing a recess 64 of the shaped film 62.

[0113] Figure 16is a schematic plan view for illustrating the distribution of the low-refractive-index region 80a.

[0114] Figure 17 is a schematic sectional view of a light guide member 910 of a comparative example.

[0115] Figure 18 is a schematic sectional view of a light guide member 920A of a comparative example.

[0116] Figure 19A is a schematic plan view showing a recess 94 of a mold release film 92 used in Comparative Example 3.

[0117] Figure 19B is a schematic sectional view showing the recess 94 of the mold release film 92 used in Comparative Example 3. DETAILED DESCRIPTION

[0118] Hereinafter, an illumination device light guide member, an illumination device, and a building member according to an embodiment of the present application will be described with reference to the drawings. The illumination device light guide member, the illumination device, and the building member according to the embodiment of the present application are not limited to the members exemplified below.

[0119] [Illumination device light guide member and illumination device]

[0120] First, an example of an illumination device light guide member and an illumination device according to an embodiment of the present application will be described with reference to the drawings.

[0121] Figure 1A is a schematic sectional view showing an illumination device 100A_L according to the embodiment of the present application. The illumination device 100A_L has a light source LS, and a light guide member 100A that receives light emitted from the light source LS and propagates it in the Y direction and emits it in the Z direction. Of course, the propagation direction of the light has a deviation (distribution) from the Y direction, and the emission direction of the light has a deviation (distribution) from the Z direction. The light guide member 100A has a visible light transmittance of 60% or more. Here, light having a wavelength of 380 nm or more and 780 nm or less is regarded as visible light.

[0122] The light guide layer 10A of the light guide member 100A has a first main surface, a second main surface on the opposite side of the first main surface, and a light-receiving side surface that receives light emitted from the light source LS. In the light guide layer 10A, the first main surface is a surface on the side of the light source LS, and the second main surface is a surface on the side opposite to the light source LS. Figure 1A In the light guide member 100A, the upper main surface is the first main surface, and the lower surface is the second main surface. The light source LS is, for example, an LED device, and a plurality of LED devices can be arranged. In addition, a coupling optical system for efficiently guiding light emitted from the light source LS to the light guide layer 10A can be provided between the light source LS and the light guide layer 10A.

[0123] The light guide member 100A has a light guide layer 10A having a refractive index n GPSmall refractive index n L1 A first low refractive index layer 20A having a refractive index n

[0124] The light guide layer 10A is formed of a publicly known material having a high transmittance with respect to visible light. The light guide layer 10A is formed of, for example, an acrylic resin such as polymethyl methacrylate (PMMA), a polycarbonate (PC) resin, a cyclic olefin resin, or glass (for example, quartz glass, alkali-free glass, borosilicate glass). The refractive index n GP of the light guide layer 10A is, for example, 1.40 or more and 1.80 or less. In addition, the refractive index refers to a refractive index measured by an ellipsometer at a wavelength of 550 nm, unless otherwise specified. The thickness of the light guide layer 10A can be appropriately set according to the use. The thickness of the light guide layer 10A is, for example, 0.05 mm or more and 50 mm or less.

[0125] The refractive index n L1 of the first low refractive index layer 20A is, for example, preferably 1.30 or less, more preferably 1.20 or less, and further preferably 1.15 or less. The first low refractive index layer 20A is preferably a solid, and the refractive index is, for example, preferably 1.05 or more. The difference between the refractive index of the light guide layer 10A and the refractive index of the first low refractive index layer 20A is preferably 0.20 or more, more preferably 0.23 or more, and further preferably 0.25 or more. The first low refractive index layer 20A having a refractive index of 1.30 or less can be formed using, for example, a porous material. The thickness of the first low refractive index layer 20A is, for example, 0.3 μm or more and 5 μm or less.

[0126] In the case where the low refractive index layer is a porous material having voids inside, the void fraction is preferably 35 vol% or more, more preferably 38 vol% or more, and particularly preferably 40 vol% or more. If within such a range, a low refractive index layer having a particularly low refractive index can be formed. The upper limit of the void fraction of the low refractive index layer is, for example, 90 vol% or less, and preferably 75 vol% or less. If within such a range, a low refractive index layer having excellent strength can be formed. The void fraction is a value calculated from the value of the refractive index measured by an ellipsometer, by Lorentz-Lorenz’s formula.

[0127] For the low refractive index layer, for example, the low refractive index layer having voids disclosed in Patent Document 3 can be used. The entire disclosure of Patent Document 3 is incorporated herein by reference. Specifically, the low refractive index layer having voids contains roughly spherical particles such as silica particles, silica particles having micropores, silica hollow nanoparticles, and the like, fibrous particles such as cellulose nanofibers, alumina nanofibers, silica nanofibers, and the like, plate-like particles such as nanoclay composed of bentonite, and the like. In one embodiment, the low refractive index layer having voids is a porous body composed of particles (e.g., microporous particles) directly chemically bound to each other. In addition, the particles constituting the low refractive index layer having voids can also be bound to each other via a small amount (e.g., less than the mass of the particles) of a binder component at least a portion thereof. The void ratio and the refractive index of the low refractive index layer can be adjusted by the particle diameter, the particle diameter distribution, and the like of the particles constituting the low refractive index layer.

[0128] As a method of obtaining the low refractive index layer having voids, for example, the methods described in Japanese Patent Application Publication No. 2010-189212, Japanese Patent Application Publication No. 2008-040171, Japanese Patent Application Publication No. 2006-011175, International Publication No. 2004 / 113966, and the like can be given. The entire disclosure of Japanese Patent Application Publication No. 2010-189212, Japanese Patent Application Publication No. 2008-040171, Japanese Patent Application Publication No. 2006-011175, and International Publication No. 2004 / 113966 is incorporated herein by reference.

[0129] As the low refractive index layer having voids, a silica porous body can be suitably used. The silica porous body is manufactured, for example, by the following methods. Methods such as a method of hydrolyzing and polycondensing at least any one of a silicon compound; a hydrolyzable silane and / or a silsesquioxane, and a partial hydrolyzate and a dehydration condensate thereof; a method of using porous particles and / or hollow microparticles; and a method of generating an aerogel layer using a rebound phenomenon; and a method of using a crushed gelatinous silicon compound obtained by a sol-gel method, and chemically binding the resulting crushed body, i.e., microporous particles, to each other using a catalyst or the like, to form a crushed gel. However, the low refractive index layer is not limited to the silica porous body, and the manufacturing method is not limited to the exemplified manufacturing methods, and can be manufactured by any manufacturing method. However, the porous layer is not limited to the silica porous body, and the manufacturing method is not limited to the exemplified manufacturing methods, and can be manufactured by any manufacturing method. In addition, the silsesquioxane is a compound represented by the formula: (RSiO 1.5silica having SiO2as a basic constitutional unit, but is common in having a network structure cross-linked by siloxane bonds, and therefore, in this specification, a porous body having a silsesquioxane as a basic constitutional unit is also referred to as a silica porous body or a silica-based porous body.

[0130] The silica porous body can be composed of microporous particles of a gel-like silicon compound combined with each other. As the microporous particles of the gel-like silicon compound, there can be mentioned a pulverized body of the gel-like silicon compound. The silica porous body can be formed, for example, by coating a coating liquid containing the pulverized body of the gel-like silicon compound on a substrate. The pulverized body of the gel-like silicon compound can be chemically combined (e.g., siloxane combined) by the action of a catalyst, light irradiation, heating, or the like, for example.

[0131] If the first low-refractive-index layer 20A is present, the interface between the light guide layer 10A and the first low-refractive-index layer 20A becomes an interface at which light propagating within the light guide layer 10A can be totally reflected, and is not affected by the state on the first low-refractive-index layer 20A. If the first low-refractive-index layer 20A is not present and the surface of the light guide layer 10A is exposed, total reflection occurs at the interface between the surface of the light guide layer 10A and air. If the surface of the light guide layer 10A is contaminated, total reflection sometimes does not occur at the surface portion to which dirt is attached. Thus, there occur malfunctions such as light leakage from the surface portion to which dirt is attached and / or change in the distribution of light propagating within the light guide layer 10A. That is, the first low-refractive-index layer 20A can improve the contamination resistance of the surface of the light guide member 100A. This effect is the same even if the first hard coat layer 40A is formed on the first low-refractive-index layer 20A.

[0132] The hardness H of the first hard coat layer 40A H1 It is preferably 2H or more, and further preferably 4H or more, in terms of pencil hardness. On the other hand, the upper limit of the hardness H of the first hard coat layer 40A H1 is not particularly limited, but is preferably 6H or less, and more preferably 5H or less, in terms of pencil hardness. The pencil hardness is measured by a method based on "Pencil Hardness Test" of JIS K 5400. Further, the hardness H GP of the light guide layer 10A is, for example, B. The thickness of the first hard coat layer 40A is preferably 1 μm or more and 30 μm or less, more preferably 2 μm or more and 20 μm or less, and further preferably 3 μm or more and 15 μm or less. If the thickness of the first hard coat layer 40A is within such a range, good scratch resistance is obtained.

[0133] In the case where the first low-refractive-index layer 20A has a hardness H GP higher than the hardness H L1In this case, the first low-refractive layer 20A can also function as the first hard coat layer 40A. That is, the first hard coat layer 40A can be omitted. In this case, the hardness H of the first low-refractive layer 20A is preferably 2H or more, more preferably 4H or more, and there is no particular upper limit, but is preferably 6H or less, more preferably 5H or less. L1 The hardness is preferably 2H or more, more preferably 4H or more, and there is no particular upper limit, but is preferably 6H or less, more preferably 5H or less, in terms of pencil hardness.

[0134] The first hard coat layer 40A can be formed of any appropriate material as long as the above-described characteristics are satisfied. The first hard coat layer 40A is, for example, a cured layer of a thermosetting resin or an ionizing radiation (e.g., visible light, ultraviolet light) curable resin. As such a curable resin, for example, urethane (meth) acrylate, polyester (meth) acrylate, epoxy (meth) acrylate, silicon resin such as polysiloxane, unsaturated polyester, and epoxy resin can be given. The first hard coat layer 40A can be formed, for example, by applying a material containing a solvent and a curable compound to the surface of the object substrate and curing it. Details of the hard coat layer suitable for use as the first hard coat layer 40A are described, for example, in Japanese Patent Application Publication No. 2011-237789. The entire disclosure of Japanese Patent Application Publication No. 2011-237789 is incorporated herein by reference.

[0135] The light guide member 100A has a light distribution control structure that can cause a portion of the light propagating in the light guide layer 10A to be at least directed toward the first low-refractive layer 20A side. The light distribution control structure has a plurality of internal spaces 14A that form an interface that causes light to be directed toward the first low-refractive layer 20A side by internal total reflection. The internal space 14A is sometimes referred to as a light cavity. In the light guide member 100A, a plurality of internal spaces 14A are formed in the light guide layer 10A. For example, as shown in the drawing, the internal space 14A has a triangular cross-sectional shape (perpendicular to the X direction, parallel to the YZ plane) having an apex angle on the first low-refractive layer 20A side (Z direction, upper side in the drawing), causing light propagating in the Y direction in the light guide layer 10A to be directed toward the first low-refractive layer 20A side. The cross-sectional shape of the internal space 14A is not limited thereto, and can be, for example, a trapezoidal shape, as long as it has an interface that causes light propagating in the Y direction to be directed toward the first low-refractive layer 20A side. The light distribution control structure formed in the light guide layer 10A is sometimes referred to as a first light distribution control structure.

[0136] The light guide member 100A has a first light distribution control structure composed of a plurality of internal spaces 14A within the light guide layer 10A, and thus the visible light transmittance is 60% or more and the haze value can be less than 10%. In addition, as described later, by adjusting the shape and arrangement of the plurality of internal spaces 14A, the light distribution of the emitted light, the emission efficiency, and the luminance distribution can be controlled. The plurality of internal spaces 14A are typically voids (cavities) filled with air inside. However, the cavities can be filled with a material having a lower refractive index than the light guide layer 10A instead of air.

[0137] On the light guide member 100A, the plurality of internal spaces 14A are regularly or randomly arranged along the main surface. The size of the internal spaces 14A can be appropriately selected within a range that can be arranged inside the light guide layer 10A. The light guide layer in which the internal spaces 14A are contained inside is not particularly limited, and for example, the light guide layers disclosed in Patent Documents 2, 4, 5, and International Publication No. 2011 / 127187 can be used. The entire disclosures of these publications are incorporated by reference into the present application.

[0138] The light guide layer 10A is produced, for example, by laminating or bonding the first film on which no pattern is formed and the second film on which a desired fine pattern is formed using an adhesive including a pressure-sensitive adhesive.

[0139] The formation of the fine pattern on the second film uses laser patterning, direct laser imaging, laser drilling, mask or maskless laser or electron beam irradiation. In addition, individual characteristics can be imparted by printing, inkjet printing, screen printing, or the like, and the material or the refractive index value can be changed. Micro / nano distribution, quantification, direct "writing", discrete laser sintering, micro electrical discharge machining (micro EDM) or micro machining, micro molding, embossing, embossing processing, and the like similar to the above can also be used.

[0140] The plurality of internal spaces 14A as the light distribution control structure have a proportion of the area of the plurality of internal spaces 14A to the area of the light guide layer 10A (area occupancy ratio) of 30% or less when the light guide layer 10A is viewed from the normal direction of the main surface, which is preferable from the viewpoint of obtaining a good visible light transmittance and haze value. In addition, the area occupancy ratio of the internal spaces 14A can be uniform or can increase as the distance increases, so that the luminance does not decrease even if the distance from the light source LS increases. A specific example is shown, and as described later, it is preferable that the area occupancy ratio of the internal spaces 14A be uniform. In addition, from the viewpoint of obtaining a good luminance, the area occupancy ratio of the internal spaces 14A is preferably 1% or more. The area occupancy ratio of the internal spaces 14A is preferably 1% or more and 30% or less, and the upper limit value is more preferably 25% or less, and in order to obtain a high visible light transmittance, it is preferably 10% or less and further preferably 5% or less.

[0141] Further, the above-described features of the light distribution control structure are not limited to the plurality of internal spaces 14A formed in the light guide layer 10A exemplified here, but are common to various light distribution control structures described later. As the light distribution control structure composed of a plurality of internal spaces, for example, the light distribution structure described in Patent Document 5 can be used.

[0142] Figure 1B A schematic cross-sectional view of the illumination device 100B_L representing an embodiment of the present application. The illumination device 100B_L differs from the illumination device 100A_L shown in FIG. 1A in that the light guide member 100B has a light guide layer 10B that receives light emitted from the light source LS, propagates the light in the Y direction, and emits the light in the -Z direction. Figure 1A

[0143] The light guide layer 10B of the light guide member 100B has a light distribution control structure that can cause a portion of the light propagating in the light guide layer 10B to be emitted at least toward the side opposite to the first low refractive index layer 20A. The light distribution control structure has a plurality of internal spaces 14B that form an interface that causes light to be emitted toward the side opposite to the first low refractive index layer 20A by internal total reflection. For example, as shown in the drawing, the internal space 14B has a cross-sectional shape (perpendicular to the X direction, parallel to the YZ plane) of a triangle having an apex angle on the side opposite to the first low refractive index layer 20A (-Z direction, lower side in the drawing), and causes light propagating in the Y direction in the light guide layer 10B to be emitted toward the side opposite to the first low refractive index layer 20A. The cross-sectional shape of the internal space 14B is not limited to this, and can be a trapezoid or the like as long as it has an interface that causes light propagating in the Y direction to be emitted toward the side opposite to the first low refractive index layer 20A. In this way, by changing the cross-sectional shape of the internal space 14B (for example, the direction of the apex angle of the triangle), it is possible to change the emission direction of light.

[0144] Figure 2A A schematic cross-sectional view of the illumination device 200A_L representing an embodiment of the present application. The light guide member 200A of the illumination device 200A_L has a first direction conversion layer 60A formed between the light guide layer 10 and the first low refractive index layer 20A, and a plurality of internal spaces 64A that constitute a light distribution control structure are formed on the first direction conversion layer 60A. The first direction conversion layer 60A can cause a portion of the light propagating in the light guide layer 10 to be emitted at least toward the side of the first low refractive index layer 20A. The light distribution control structure formed in the first direction conversion layer 60A is sometimes referred to as a second light distribution control structure. The internal spaces 64A can have various cross-sectional shapes as with the internal spaces 14A.

[0145] Figure 2B ​This is a schematic cross-sectional view showing an illumination device 200B_L according to an embodiment of the present invention. The illumination device 200B_L has a light guide member 200B with a first direction-changing layer 60B formed between a light guide layer 10 and a first low-refractive-index layer 20A. A plurality of internal spaces 64B constituting a light distribution control structure are formed on the first direction-changing layer 60B. The first direction-changing layer 60B enables a portion of the light propagating within the light guide layer 10 to be oriented at least towards the side opposite to the first low-refractive-index layer 20A (-Z direction). The light distribution control structure formed within the first direction-changing layer 60B is sometimes referred to as a second light distribution control structure. The internal spaces 64B can have various cross-sectional shapes, similar to the internal spaces 14B.

[0146] Figure 3 This is a schematic cross-sectional view illustrating another lighting device 300A_L according to an embodiment of the present invention. The lighting device 300A_L has a light guide member 300A with a first direction-changing layer 70A formed between a light guide layer 10 and a first low-refractive-index layer 20A. The first direction-changing layer 70A has a plurality of protrusions 74A constituting a light distribution control structure. The first direction-changing layer 70A, including the plurality of protrusions 74A, can be, for example, a known prism sheet. The plurality of protrusions 74A direct light propagating in the Y direction within the light guide layer 10 toward the side of the first low-refractive-index layer 20A (Z direction). The cross-sectional shape of the protrusions 74A is, for example, triangular, but not limited to this; it can also be trapezoidal, etc. By changing the cross-sectional shape of the protrusions 74A, light propagating in the Y direction can also be directed toward the side opposite to the first low-refractive-index layer 20A (-Z direction). Alternatively, the plurality of protrusions (prism portions) can be formed directly on the surface of the light guide layer 10A instead of providing the first direction-changing layer 70A.

[0147] Next, the structure of the light guide component will be described in detail. Below, examples will be described where the light distribution control structure has multiple internal spaces (14A) forming an interface that directs light toward the side of the first low-refractive-index layer via internal total internal reflection, or multiple internal spaces (14B) forming an interface that directs light toward the side opposite to the first low-refractive-index layer via internal total internal reflection.

[0148] Figure 4A express Figure 1A The diagram shows a cross-sectional view of the light guide component 100A of the lighting device 100A_L. Figure 4B express Figure 1B A cross-sectional view of the light guide component 100B of the lighting device 100B_L shown. Additionally, Figure 5A express Figure 2A A cross-sectional view of the light guide component 200A of the lighting device 200A_L shown. Figure 5B express Figure 2B A cross-sectional view of the light guide component 200B of the lighting device 200B_L shown.

[0149] likeFigure 4A As shown, in the light guide component 100A, multiple internal spaces 14A formed within the light guide layer 10A constitute a light distribution control structure, such as... Figure 4B As shown, in the light guide component 100B, multiple internal spaces 14B formed within the light guide layer 10B constitute a light distribution control structure. Additionally, as... Figure 5A As shown, in the light guide component 200A, a plurality of internal spaces 64A formed within the first direction conversion layer 60A formed on the light guide layer 10 constitute a light distribution control structure, such as... Figure 5B As shown, in the light guide component 200B, a plurality of internal spaces 64B formed within the first direction conversion layer 60B formed on the light guide layer 10 constitute a light distribution control structure. The refractive index n of the first direction conversion layers 60A and 60B is... D1 Preferably, the refractive index n of the light guide layer 10 is the same. GP The refractive indices are approximately equal, and the absolute value of the difference is preferably 0.15 or less, more preferably 0.1 or less. Furthermore, the refractive index n of the light guide layer 10... GP The refractive index a of the first low-refractive-index layer 20A L1 difference ( Figure 4A , Figure 4B The refractive index n of the first orientation transformation layer 60A D1 The refractive index n of the first low-refractive-index layer 20A L1 difference ( Figure 5A , Figure 5B The values ​​are preferably 0.2 or higher, and more preferably 0.25 or higher. By adjusting this difference, the critical angle for total internal reflection can be controlled.

[0150] A light distribution control structure with multiple internal spaces 14A, 14B, 64A, and 64B achieves total internal reflection of light propagating within the light guide layers 10A and 10B or the first direction conversion layers 60A and 60B through the interfaces formed by the internal spaces 14A, 14B, 64A, and 64B, causing the light to exit in the Z direction (internal spaces 14A and 64A) or the -Z direction (internal spaces 14B and 64B). Conversely, in Figure 3 In the first orientation conversion layer 70A shown, for example, which is composed of a known prism sheet, a portion of the light propagating within the first orientation conversion layer 70A is totally internally reflected at the interface with the first low-refractive-index layer 20A and returns to the first orientation conversion layer 70A. Thus, the light utilization efficiency of the light distribution control structure having internal spaces 14A, 14B, 64A, 64B is higher than that of known prism sheets and other light distribution control structures. Furthermore, by adjusting the cross-sectional shape of the internal spaces 14A, 14B, 64A, 64B (e.g., ...), ... Figure 15 The angles (θa, θb) of the inclined surfaces, their size, density, and distribution can control the light distribution.

[0151] On the other hand, by adjusting the cross-sectional shape, size, arrangement density, and distribution of the plurality of internal spaces 14A, 14B, 64A, 64B of the light distribution control structure, the visible light transmittance and the haze value of the light guide member 100A, 100B, 200A, or 200B can be controlled. The visible light transmittance of the light guide member 100A, 100B, 200A, and 200B is preferably 60% or more, more preferably 65% or more, 70% or more, 75% or more, or 80% or more, and the haze value can be 10% or less, preferably 9% or less, 8% or less, 7% or less, 6% or less, 5% or less, 4% or less, or 3% or less. Furthermore, as described in the following examples, the haze value is measured using a hazemeter.

[0152] The plurality of internal spaces 14A, 14B, 64A, 64B of the light distribution control structure have a proportion (area occupancy rate) of the area of the plurality of internal spaces 14A, 14B, 64A, 64B to the area of the light guide layer 10A, 10B, or 10 when viewed from the normal direction of the main surface of the light guide layer 10A, 10B, or 10 of 30% or less, which is preferable from the viewpoint of obtaining a good visible light transmittance and haze value. Furthermore, the area occupancy rate of the internal spaces 14A, 14B, 64A, 64B can be uniform, or the area occupancy rate can increase as the distance increases, so that the luminance does not decrease even if the distance from the light source LS increases. Specific examples are shown, and as described later, it is preferable that the area occupancy rate of the internal spaces 14A, 14B, 64A, 64B be uniform. Furthermore, from the viewpoint of obtaining a good luminance, the area occupancy rate of the internal spaces 14A, 14B, 64A, 64B is preferably 1% or more. The area occupancy rate of the internal spaces 14A, 14B, 64A, 64B is preferably 1% or more and 30% or less, and the upper limit is more preferably 25% or less, and in order to obtain a high visible light transmittance, it is preferably 10% or less, and further preferably 5% or less.

[0153] In addition, the size and density of the internal spaces 14A, 14B, 64A, 64B affect the haze value. In terms of the size (length L, width W: refer to Figure 14A , Figure 14B ) of the internal spaces 14A, 14B, 64A, 64B, for example, the length L is preferably 10 μm or more and 500 μm or less, and the width W is preferably 1 μm or more and 100 μm or less. In addition, from the viewpoint of light extraction efficiency, the height H is preferably 1 μm or more and 100 μm or less. The plurality of internal spaces 14A, 14B, 64A, 64B are preferably uniformly distributed discretely, and for example, as shown in Figure 14A , periodic arrangement is preferable. The pitch Px is, for example, preferably 10 μm or more and 500 μm or less, and the pitch Py is, for example, preferably 10 μm or more and 500 μm or less.

[0154] Next, reference will be made toFigure 6A , Figure 6B , Figure 7A , Figure 7B , Figure 8-11 Other structural examples of the light guide component according to embodiments of the present invention will be described, but the invention is not limited thereto, and various combinations are possible.

[0155] exist Figure 6A In the light guide component 210A shown, a light distribution control structure (sometimes referred to as a third light distribution control structure) is constituted by a plurality of internal spaces 64A formed on a second orientation conversion layer 60A disposed on a second main surface of the light guide layer 10. The second orientation conversion layer 60A having internal spaces 64A causes a portion of the light propagating within the light guide layer 10 to be directed at least toward the side of the first low refractive index layer 20A (Z direction).

[0156] exist Figure 6B In the light guide component 210B shown, a light distribution control structure (sometimes referred to as a third light distribution control structure) is constituted by a plurality of internal spaces 64B formed on a second orientation conversion layer 60B disposed on a second main surface of the light guide layer 10. The second orientation conversion layer 60B having internal spaces 64B causes a portion of the light propagating within the light guide layer 10 to be oriented at least toward the side opposite to the first low refractive index layer 20A (-Z direction).

[0157] Figure 7A The light guide component 220A shown is in Figure 5A The light guide component 200A shown further includes a first optical coupling layer 80. The first optical coupling layer 80 is disposed between the light guide layer 10 and the first direction conversion layer 60A. The first optical coupling layer 80 has a plurality of first low refractive index regions 80a, which have a refractive index n lower than that of the light guide layer 10. GP Small refractive index n C1 The first optical coupling layer 80, composed of multiple first low-refractive-index regions 80a, will guide light propagating in the light guide layer 10 to the first direction conversion layer 60A more selectively and effectively. The refractive index n of the first low-refractive-index region 80a is... C1 Preferably, the value is 1.05 or higher and 1.30 or lower, and more preferably 1.05 or higher and 1.25 or lower.

[0158] Figure 7B The light guide component 220B shown is in Figure 5B The light guide component 200B shown further includes a first optical coupling layer 80. The first optical coupling layer 80 is disposed between the light guide layer 10 and the first direction conversion layer 60B. The first optical coupling layer 80 has a plurality of first low refractive index regions 80a, which have a refractive index n lower than that of the light guide layer 10. GP Small refractive index n C1The first optical coupling layer 80, composed of multiple first low refractive index regions 80a, will guide the light propagating in the light guide layer 10 to the first direction conversion layer 60B more selectively and effectively.

[0159] Figure 8 The light guide component 100AD shown is in Figure 1A The light guide component 100A shown further has a second main surface side disposed on the light guide layer 10A, having a refractive index n that is greater than that of the light guide layer 10A. GP Small refractive index n L2 The second low refractive index layer 20B, and the layer disposed on the opposite side of the second low refractive index layer 20B from the light guide layer 10A, having a hardness H greater than that of the light guide layer 10A. GP High hardness H H2 The second hard coating 40B. The second low refractive index layer 20B and the second hard coating 40B can each have the same characteristics as the first low refractive index layer 20A and the first hard coating 40A, respectively. By also providing the second low refractive index layer 20B and the second hard coating 40B on the second main surface side of the light guide layer 10A, the above-mentioned effect can also be obtained on the second main surface side. The light guide member 100AD emits light in the Z direction because it has a light guide layer 10A with multiple internal spaces 14A formed therein. By configuring the light guide layer 10B with multiple internal spaces 14B (for example, refer to...) Figure 1B By replacing the light guide layer 10A of the light guide component 100AD with a light guide component, a light guide component that emits light in the -Z direction can be obtained.

[0160] Figure 9 The light guide component 210AD shown is in Figure 6A The light guide component 210A shown further has a second main surface side disposed on the light guide layer 10, having a refractive index n that is higher than that of the light guide layer 10. GP Small refractive index n L2 The second low-refractive-index layer 20B and the second hard coating layer 40B with a pencil hardness of H or higher disposed on the opposite side of the light guide layer 10 of the second low-refractive-index layer 20B. The light guide component 210AD emits light in the Z direction because it has a second direction-changing layer 60A having multiple internal spaces 64A. This is achieved by configuring the second direction-changing layer 60B having multiple internal spaces 14B (for example, see reference 10 ... Figure 6B By replacing the second direction conversion layer 60A of the light guide component 210AD, a light guide component that emits light in the -Z direction can be obtained.

[0161] Figure 10 The light guide component 200AD shown is in Figure 5A The light guide component 200A shown further has a second main surface side disposed on the light guide layer 10, having a refractive index n that is higher than that of the light guide layer 10. GP Small refractive index n L2The second low refractive index layer 20B, and the layer disposed on the opposite side of the light guide layer 10 of the second low refractive index layer 20B, having a hardness H greater than that of the light guide layer 10. GP High hardness H H2 The second hard coating 40B. The light guide component 200AD emits light in the Z direction because it has a second orientation conversion layer 60A with multiple internal spaces 64A formed therein. This is achieved by configuring the second orientation conversion layer 60B with multiple internal spaces 64B (for example, refer to...). Figure 5B By replacing the second direction conversion layer 60A of the light guide component 200AD, a light guide component that emits light in the -Z direction can be obtained.

[0162] Figure 11 The light guide component 220AD shown is in Figure 7A The light guide component 220A shown further has a second main surface side disposed on the light guide layer 10, having a refractive index n that is higher than that of the light guide layer 10. GP Small refractive index n L2 The second low refractive index layer 20B, and the layer disposed on the opposite side of the light guide layer 10 of the second low refractive index layer 20B, having a hardness H greater than that of the light guide layer 10. GP High hardness H H2 The second hard coating 40B. The light guide component 220AD, having a second orientation conversion layer 60A with multiple internal spaces 64A, emits light in the Z direction. By configuring the second orientation conversion layer 60B with multiple internal spaces 64B (for example, refer to...) Figure 7B By replacing the second direction conversion layer 60A of the light guide component 220AD, a light guide component that emits light in the -Z direction can be obtained.

[0163] The light guide component of the embodiments of the present invention can be modified in various ways. For example, by mixing particles into the forming materials of the first hard coating and / or the second hard coating, an anti-glare hard coating with an uneven surface can also be formed. Furthermore, this allows for control of the haze value of the light guide component. As particles, there are, for example, inorganic particles and organic particles. Inorganic particles are not particularly limited; examples include silicon oxide particles, titanium oxide particles, aluminum oxide particles, zinc oxide particles, tin oxide particles, calcium carbonate particles, barium sulfate particles, talc particles, kaolin particles, and calcium sulfate particles. Similarly, organic particles are not particularly limited; examples include polymethyl methacrylate resin powder (PMMA particles), silicone resin powder, polystyrene resin powder, polycarbonate resin powder, styrene acrylic resin powder, benzoguanamine resin powder, melamine resin powder, polyolefin resin powder, polyester resin powder, polyamide resin powder, polyimide resin powder, and polyvinyl fluoride resin powder. These inorganic and organic particles can be used individually or in combination of two or more.

[0164] From the viewpoint of being able to impart good antiglare properties, the mass average particle diameter of the particles mixed in the forming material of the first hard coat layer and / or the second hard coat layer is preferably in the range of 0.5 μm or more and 8.0 μm or less. The mass average particle diameter of the particles is more preferably in the range of 2.0 μm or more and 6.0 μm or less, and further preferably in the range of 3.0 μm or more and 6.0 μm or less. In addition, the mass average particle diameter of the particles is also preferably in the range of 30% or more and 80% or less of the thickness of the first hard coat layer and / or the second hard coat layer. Furthermore, the mass average particle diameter of the particles can be measured by a Coulter counter method. For example, the resistance of an electrolyte corresponding to the volume of the particles when the particles pass through a fine hole is measured by using a particle size distribution measuring device (trade name: Coulter Multisizer, manufactured by Beckman Coulter, Inc.) that utilizes a fine hole resistance method, the number and volume of the particles are measured, and the mass average particle diameter is calculated.

[0165] The shape of the particles is not particularly limited, and can be, for example, a roughly spherical shape like a bead, or an amorphous shape like a powder, but is preferably a roughly spherical shape, more preferably a roughly spherical microparticle having an aspect ratio of 1.5 or less, and most preferably a spherical particle.

[0166] The blending ratio of the particles is preferably in the range of 5 parts by mass or more and 20 parts by mass or less, and more preferably in the range of 5 parts by mass or more and 17 parts by mass or less, with respect to 100 parts by mass of the hard coat layer forming material. For example, an antiglare hard coat layer described in Japanese Patent Application Publication No. 2013-178534 can be suitably used. The entire disclosure of Japanese Patent Application Publication No. 2013-178534 is incorporated herein by reference.

[0167] Further, as the outermost layer of the light guide member, an antifouling layer having hydrophobicity and / or oleophobicity (hydrophilicity) can be further provided on one or both of the main surfaces. The structure of the antifouling layer is appropriately selected depending on the use. The antifouling layer is formed using a known material. As the material constituting the antifouling layer, a silicone-based compound or a fluorine-containing compound is preferred. Among them, the fluorine-containing compound is excellent in water repellency and can exhibit high antifouling properties, and a fluorine-based polymer containing a perfluoropolyether skeleton is particularly preferred. From the viewpoint of improving the antifouling properties, a perfluoropolyether having a main chain structure that can be rigidly aligned is particularly preferred. As the structural unit of the main chain skeleton of the perfluoropolyether, a perfluoroalkylene oxide having a branched chain of 1 to 4 carbon atoms is preferred, and for example, a perfluoromethylene oxide, (-CF2O-), a perfluoroethylene oxide (-CF2CF2O-), a perfluoropropylene oxide (-CF2CF2CF2O-), a perfluoroisopropylene oxide (-CF(CF3)CF2O-), and the like can be given.

[0168] The thickness of the antifouling layer is preferably in the range of 3 nm or more and 15 nm or less, and more preferably in the range of 3 nm or more and 10 nm or less.

[0169] The method of forming the antifouling layer can use a physical vapor deposition method such as evaporation, sputtering, a chemical vapor deposition method, a reverse coating method, a die coating method, a gravure coating method, or the like, depending on the material to be formed. For example, the antifouling layer described in Japanese Patent Application Publication No. 2020-067582 can be suitably used. The entire disclosure of Japanese Patent Application Publication No. 2020-067582 is incorporated herein by reference.

[0170] An antireflection layer can also be formed on the light guide layer side of the antifouling layer. As the antireflection layer, for example, a multilayer laminate composed of a plurality of thin films having different refractive indexes can be cited. As the material of the thin films constituting the antireflection layer, oxides, nitrides, fluorides, and the like of metals can be cited.

[0171] The antireflection layer is preferably an alternating laminate of a high refractive index layer and a low refractive index layer. The high refractive index layer has, for example, a refractive index of 1.9 or more, and preferably 2.0 or more. As the high refractive index material, titanium oxide, niobium oxide, zirconium oxide, tantalum oxide, zinc oxide, indium oxide, indium tin oxide (ITO), antimony-doped tin oxide (ATO), and the like can be cited. Of these, titanium oxide or niobium oxide is preferable. The low refractive index layer has, for example, a refractive index of 1.6 or less, and preferably 1.5 or less. As the low refractive index material, silicon oxide, titanium nitride, magnesium fluoride, barium fluoride, calcium fluoride, hafnium fluoride, lanthanum fluoride, and the like can be cited. Of these, silicon oxide is preferable. It is particularly preferable to alternately laminate a niobium oxide (Nb2O5) thin film as the high refractive index layer and a silicon oxide (SiO2) thin film as the low refractive index layer. In addition to the low refractive index layer and the high refractive index layer, a middle refractive index layer having a refractive index of about 1.6 to 1.9 can also be provided.

[0172] The film thickness of the high refractive index layer and the low refractive index layer is each about 5 nm or more and 200 nm or less, and is preferably about 15 nm or more and 150 nm or less. As long as the film thickness of each layer is designed in such a manner that the reflectance of visible light is reduced, depending on the refractive index or the laminate structure, or the like.

[0173] The antireflection layer is preferably laminated on the hard coat layer via a primer layer. As the material constituting the primer layer, for example, metals such as silicon, nickel, chromium, tin, gold, silver, platinum, zinc, titanium, tungsten, aluminum, zirconium, and palladium; alloys of these metals; oxides, fluorides, sulfides, or nitrides of these metals; and the like can be cited. Of these, the material of the primer layer is preferably an oxide, and particularly preferably silicon oxide. The primer layer is preferably an inorganic oxide layer having an oxygen amount less than the stoichiometric composition. Of the inorganic oxides having a non-stoichiometric composition, silicon oxide represented by the composition formula SiOx (0.5 ≤ x < 2) is preferable. The thickness of the primer layer is, for example, about 1 nm or more and 20 nm or less, and is preferably about 3 nm or more and 15 nm or less.

[0174] The method for forming the thin film constituting the antireflective layer is not particularly limited, and can be either wet coating or dry coating. From the perspective of forming a thin film with uniform thickness, dry coating methods such as vacuum evaporation, CVD, sputtering, and electron beam evaporation are preferred. Among these, sputtering is preferred from the perspective of easily forming a film with excellent uniformity and density. For example, the antireflective layer described in Japanese Patent Application Publication No. 2020-52221 is suitable for use. The entire disclosure of Japanese Patent Application Publication No. 2020-52221 is incorporated herein by reference.

[0175] Hereinafter, using examples, the light guide component for the lighting device according to embodiments of the present invention will be described in more detail.

[0176] In the embodiment, a fabrication with Figure 12A and Figure 13A The light guide components 200AD_a and 220AD_a with the cross-sectional structures shown are illustrated. Figure 12A The light guide component 200AD_a shown essentially corresponds to Figure 10 The light guide component 200AD shown is... Figure 13A The light guide component 220AD_a shown essentially corresponds to Figure 11 The light guide component 220AD is shown.

[0177] Figure 12A The light guide component 200AD_a shown has, in addition to having Figure 10 In addition to the light guide component 200AD shown, it also has substrate layers 30A and 30B and adhesive layers 52, 54, and 56. The first direction-changing layer 60A in the light guide component 200AD_a is formed by... Figure 14A and Figure 14B The shaped film 62 shown is composed of an adhesive layer 54 (or further, an adhesive layer 52). That is, by using... Figure 14B The shaped film 62 shown is configured such that the recess 64 of the recess 64 is formed by the adhesive layer 54 to form an internal space 64A, thereby obtaining a structure that substantially corresponds to the first orientation change layer 60A.

[0178] In addition, similarly, by using Figure 14B The recess 64 of the shaped film 62 shown is configured such that the internal space 64B is formed by the adhesive layer 54, resulting in the shaped film 62B. Figure 12BThe light guide component 200BD_a is shown. Furthermore, the substrate layers 30A, 30B, and 30C, for example, serve to support the first low-refractive-index layer 20A, the second low-refractive-index layer 20B, the first hard coating layer 40A, or the second hard coating layer 40B. The arrangement of the substrate layers 30A, 30B, and 30C with the first low-refractive-index layer 20A, the second low-refractive-index layer 20B, the first hard coating layer 40A, and the second hard coating layer 40B can be appropriately modified. For example, in the light guide component 200AD_a, the first low-refractive-index layer 20A is supported on the substrate layer 30A, and in the light guide component 200BD_a, the first low-refractive-index layer 20A is supported on the substrate layer 30B.

[0179] Figure 13A The light guide component 220ADa shown has, in addition to having Figure 11 In addition to the light guide component 220AD shown, it also has substrate layers 30A, 30B, and 30C and adhesive layers 52, 54, 56, and 58. The first direction-changing layer 60A in the light guide component 220AD_a is formed by... Figure 14A and Figure 14B The shaped film 62 shown is composed of an adhesive layer 54 (or further, an adhesive layer 52). That is, by using... Figure 14B The shaped film 62 shown is configured such that the recess 64 of the recess 64 is formed by the adhesive layer 54 to form an internal space 64A, thus obtaining a structure that substantially corresponds to the first orientation change layer 60A.

[0180] Alternatively, it can be like Figure 13B As shown in the light guide component 220AD_b, by means of Figure 14B The shaped film 62 shown is disposed on the substrate layer 30B by forming an internal space 64A in the recess 64 of the adhesive layer 54, thereby obtaining a structure substantially corresponding to the first orientation change layer 60A. Similarly, by using... Figure 14B The recess 64 of the shaped film 62 shown is configured such that the internal space 64B is formed by the adhesive layer 54, thereby achieving the desired shape. Figure 13C The light guide component 220BD_a is shown.

[0181] Here, "adhesive" is used to mean a pressure-sensitive adhesive (also known as a binder). Specific examples of adhesives include rubber-based adhesives, acrylic-based adhesives, silicone-based adhesives, epoxy-based adhesives, cellulose-based adhesives, and polyester-based adhesives. These adhesives can be used alone or in combination of two or more.

[0182] As the low refractive index layer, if a porous material (for example, a gel formed of a silicon compound) is used, the strength is low and brittle. Therefore, a substrate layer (for example, an acrylic film) is used to form the low refractive index layers 20A, 20B, the low refractive index region 80a on the substrate layer.

[0183] In addition, in order to mass-produce the light guide member by a roll-to-roll method or a roll-to-sheet method, a structure in which a laminate adhered to a plurality of substrate layers is used is adopted. In addition, a structure corresponding to the first direction conversion layer 60A having a plurality of internal spaces 64A is constituted by the shaped film 62 having the recesses 64 and the adhesive layer 54. Figure 10 、 Figure 11 ).

[0184] The thickness of the substrate layers 30A, 30B, 30C is, for example, independently 1 μm or more and 1000 μm or less, preferably 10 μm or more and 100 μm or less, and further preferably 20 μm or more and 80 μm or less. The refractive index of the substrate layers 30A, 30B, 30C is, for example, independently preferably 1.40 or more and 1.70 or less, and further preferably 1.43 or more and 1.65 or less.

[0185] The thickness of the adhesive layers 52, 54, 56, 58 is, for example, independently 0.1 μm or more and 100 μm or less, preferably 0.3 μm or more and 100 μm or less, and further preferably 0.5 μm or more and 50 μm or less. The refractive index of the adhesive layers 52, 54, 56, 58 is, for example, independently preferably 1.42 or more and 1.60 or less, and more preferably 1.47 or more and 1.58 or less. In addition, the refractive index of the adhesive layers 52, 54, 56, 58 is preferably close to the refractive index of the light guide layer 10 or the shaped film 62 to which it is attached, and the absolute value of the difference in refractive index is preferably 0.2 or less.

[0186] Example

[0187] The measurement method of each property is as follows.

[0188] [Refractive index]

[0189] After the low refractive index layer is formed on the acrylic film, it is cut to a size of 50 mm x 50 mm, and is attached to the surface of a glass plate (thickness: 3 mm) by an adhesive layer. The back surface central portion (diameter of about 20 mm) of the above glass plate is painted black with a black universal pen, and a sample that does not reflect on the back surface of the glass plate is prepared.

[0190] The above sample is placed in an ellipsometer (manufactured by J. A. Woollam Japan Co., Ltd.: trade name VASE), and the refractive index is measured under conditions of a wavelength of 550 nm and an incident angle of 50 degrees or more and 80 degrees or less, and the average value thereof is used as the refractive index. Unless otherwise specified, the refractive index in the present specification is in accordance with this specification.

[0191] [Scratch resistance]

[0192] A steel wool test (φ 25 mm) was performed under a load of 100 g x 10 times, and the presence or absence of scratches was visually confirmed. A case where scratches could not be identified was evaluated as O (Good), and a case where scratches could be identified was evaluated as X (NG).

[0193] [Stain resistance]

[0194] When a layer was applied to the light-emitting surface of the light guide member with an oily universal pen (manufactured by Zebra Co., Ltd.: product name McKee Ultra Fine), the presence or absence of ink repellency was visually evaluated as O or X in the case where the ink adhered to the surface without being repelled.

[0195] [Haze value]

[0196] The sample was cut to a size of 50 mm x 50 mm, and the haze value was measured with a haze meter (manufactured by Murakami Color Research Laboratory: product name HM-150).

[0197] [Visible light transmittance]

[0198] The visible light transmittance of the sample was the average value of the visible light transmittance at each wavelength when measured with a spectrophotometer at a measurement wavelength of 380 nm or more and 780 nm or less. Here, the visible light transmittance was also measured with the above-described haze meter.

[0199] [Manufacturing Example 1]

[0200] Manufacture of the concave-convex shaped film

[0201] The concave-convex shaped film was manufactured according to the method described in Japanese Laid-Open Patent Publication No. 2013-524288. Specifically, the surface of a polymethyl methacrylate (PMMA) film was coated with lacquer (manufactured by Sanyo Chemical Industries, Inc.: Fine Qua RM-64), the film surface including the lacquer was embossed with an optical pattern, and then the lacquer was cured, thereby manufacturing the target concave-convex shaped film. The total thickness of the concave-convex shaped film was 130 μm, and the haze was 0.8%.

[0202] Figure 14A FIG. 1 is a plan view showing a portion of the manufactured concave-convex shaped film as viewed from the concave-convex surface side. In addition, Figure 14B Figure 14A ​FIG. 14B-14B' is a cross-sectional view of the concave-convex shaped film of Example 1. The length L is 80 pm, the width W is 14 pm, and the depth H is 10 pm. The concave-convex shaped film surface has a plurality of concave portions in the shape of a triangle. The plurality of concave portions are arranged at intervals of a width E (155 pm) in the X direction. Further, the pattern of the concave portions is spaced at intervals of a width D (100 pm) in the Y direction. The density of the concave portions on the concave-convex shaped film surface is 3612 pieces / cm2. 2 . Figure 15 Both of θa and θb in FIG. 14B-14B' are 41°. The area ratio of the concave portions when viewed from the concave-convex surface side is 4.05%.

[0203] [Manufacturing Example 2]

[0204] Preparation of the coating liquid for forming a low refractive index layer

[0205] Manufactured according to the description of International Publication No. 2019 / 026865. Details are as follows.

[0206] (1) Gelation of the silicon compound

[0207] A mixed liquid A was prepared by dissolving 0.9 g of a precursor of a gel-like silicon compound, methyltrimethoxysilane (MTMS), in 2.2 g of dimethyl sulfoxide (DMSO). To this mixed liquid A, 0.5 g of a 0.01 mol / L aqueous oxalic acid solution was added, and stirred at room temperature for 30 minutes, thereby hydrolyzing the MTMS to produce a mixed liquid B containing tris(hydroxymethyl)silane.

[0208] After adding 0.38 g of 28 mass% ammonia water and 0.2 g of pure water to 5.5 g of DMSO, further adding the above mixed liquid B, and stirring at room temperature for 15 minutes, gelation of the tris(hydroxymethyl)silane was performed, thereby obtaining a mixed liquid C containing a gel-like silicon compound.

[0209] (2) Ripening treatment

[0210] The mixed liquid C containing a gel-like silicon compound prepared as described above was directly incubated at 40°C for 20 hours to perform the ripening treatment.

[0211] (3) Pulverization treatment

[0212] Next, the gelatinous silicon compound after the aging treatment as described above was crushed with a spatula into a size of several mm to several cm in particle form. Then, 40 g of isopropyl alcohol (IPA) was added to the mixed solution C, and after gentle stirring, the mixed solution was left to stand at room temperature for 6 hours to allow the solvent and catalyst in the gel to be decanted. By performing the same decanting treatment three times, solvent replacement was performed, and a mixed solution D was obtained. Next, the gelatinous silicon compound in the mixed solution D was subjected to a pulverization treatment (high-pressure medium-free pulverization). The pulverization treatment (high-pressure medium-free pulverization) was performed using a homogenizer (SMT Co., Ltd., trade name "UH-50") for 2 minutes at 50 W and 20 kHz after weighing 1.85 g of the gelatinous compound in the mixed solution D and 1.15 g of IPA in a 5-cc screw cap bottle.

[0213] By the pulverization treatment, the gelatinous silicon compound in the mixed solution D was pulverized, and thus the mixed solution D' became a sol liquid of the pulverized product. The volume average particle diameter indicating the particle size deviation of the pulverized product contained in the mixed solution D' was confirmed using a dynamic light scattering type NANOTRAC particle size analyzer (Upatras Co., Ltd., UPA-EX150 type), and the result was 0.50 to 0.70. Further, with respect to 0.75 g of the sol liquid (mixed solution C'), a 1.5 mass% concentration MEK (methyl ethyl ketone) solution of a photobase generator (Wako Pure Chemical Industries, Ltd.: trade name WPBG266) was added at a rate of 0.062 g, and a 5% concentration MEK solution of bis(trimethoxysilyl)ethane was added at a rate of 0.036 g, and a coating liquid for a low refractive index layer (a liquid containing a microporous particle) was obtained.

[0214] [Manufacturing Example 3]

[0215] Preparation of a hard coat (HC) layer coating liquid

[0216] Manufactured by reference to the manufacturing method described in Japanese Patent Application Publication No. 2011-237789. Details are as follows.

[0217] In a resin solution (DIC Co., Ltd., trade name "UNIDIC 17-806", solid content concentration 80%) in which a polyurethane acrylate was used as a main component, 5 parts of a photopolymerization initiator (BASF Co., Ltd., product name "IRGACURE 906") and 0.5 parts of a leveling agent (DIC Co., Ltd., product name "GRANDIC PC 4100") were added per 100 parts of the solid content in the solution. Then, butyl acetate was added to the above solution so that the solid content concentration in the above solution was 75%. Further, cyclopentanone was added to the above solution so that the solid content concentration in the above solution was 50%. In this way, an HC layer coating liquid for forming an HC layer was prepared.

[0218] [Production Example 4]

[0219] Formation of the adhesive A layer (adhesive layer 54)

[0220] The adhesive A layer was formed by the following steps. The adhesive A layer can be adhered without burying the recess of the surface.

[0221] (1) Preparation of the adhesive A solution

[0222] In a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen introduction tube, and a cooler, 95.0 parts by mass of n-butyl acrylate, 5.0 parts by mass of acrylic acid, and 0.2 parts by mass of 2,2’-azobisisobutyronitrile as a polymerization initiator were added to the flask together with ethyl acetate so that the total of the monomers became 40.0% by mass, and nitrogen replacement was performed for 1 hour while slowly stirring and introducing nitrogen. Then, the liquid temperature in the flask was maintained at around 63°C, and a polymerization reaction was performed for 6 hours. Then, ethyl acetate was added so that the solid content became 40% by mass, and an acrylic polymer was obtained. In the obtained acrylic polymer solution, 6.0 parts by mass of 1,3-bis(N,N-diglycidylaminomethyl)cyclohexane (trade name “TETRAD-C”, manufactured by Mitsubishi Gas Chemical Company, Inc.) as a crosslinking agent was mixed with respect to 100 parts by mass of the solid content of the polymer, and an adhesive A solution was prepared.

[0223] (2) Formation of the adhesive A layer

[0224] The adhesive A solution was applied to one side of a 38-μm-thick polyethylene terephthalate (PET) film (trade name “MRF38”, manufactured by Mitsubishi Chemical Corporation) subjected to silicone release treatment so that the thickness of the dried adhesive layer was 1 μm, and dried at 150°C for 3 minutes, and an adhesive A layer was formed. The refractive index was 1.47.

[0225] [Production Example 5]

[0226] Formation of the adhesive B layer (adhesive layers 52, 56, and 58)

[0227] The adhesive B layer was formed with reference to the method described in Japanese Patent Application Publication No. 2018-136401. Specifically, the following was performed.

[0228] (1) Preparation of the acrylic polymer

[0229] A monomer mixture containing 82 parts butyl acrylate, 15 parts benzyl acrylate, and 3 parts 4-hydroxybutyl acrylate was added to a four-necked flask equipped with a stirring blade, thermometer, nitrogen inlet pipe, and cooler. Then, relative to 100 parts of the monomer mixture (solid content), 0.1 parts of 2,2'-azobisisobutyronitrile (2,2'-Azobisisobutyronitrile) as a polymerization initiator were added along with ethyl acetate. While slowly stirring, nitrogen was introduced for nitrogen purging, and the liquid temperature in the flask was maintained at approximately 60°C for 7 hours for polymerization. Then, ethyl acetate was added to the resulting reaction solution to prepare a solution of an acrylic polymer with a mass average molecular weight of 1 million, adjusted to a solid content concentration of 30%.

[0230] (2) Preparation of adhesive B solution

[0231] To prepare adhesive solution B, 100 parts of the solid component of the acrylic polymer solution obtained above were added, along with 0.002 parts of lithium bis(trifluoromethanesulfonyl)imide (manufactured by Japan Carlit Co., Ltd.), 0.1 parts of trimethylolpropanedimethyl diisocyanate (manufactured by Mitsui Chemicals Co., Ltd.: Takenate D110N), 0.3 parts of benzoyl peroxide, 0.075 parts of γ-epoxypropoxypropylmethoxysilane (manufactured by Shin-Etsu Chemical Industry Co., Ltd.: KBM-403), and 0.5 parts of SILYL SAT10 (number average molecular weight 4000) manufactured by KANEKA Co., Ltd.

[0232] (3) Formation of adhesive layer B

[0233] The adhesive B solution obtained above was uniformly coated onto the surface of a PET film release substrate (Mitsubishi Resin Co., Ltd. MRF38CK) treated with a silicone-based release agent using a coater. The substrate was then dried in an air-circulating oven at 155°C for 2 minutes, thereby forming the adhesive B layer. The refractive index of the adhesive B layer was 1.47, and its thickness was 10 μm.

[0234] Example 1

[0235] (1) Fabrication of light guide components

[0236] Production Figure 12A The light guide component 200AD_a is shown.

[0237] The adhesive layer A formed in Manufacturing Example 4 was applied to the uneven surface of the embossed film in Manufacturing Example 1 using a hand roller, resulting in a laminate of embossed film / adhesive layer A / PET film. Next, the PET film of this laminate was peeled off and applied to an acrylic sheet (manufactured by Mitsubishi Chemical Corporation, trade name Acrylite) with a thickness of 5 mm, a width of 120 mm, and a length of 700 mm using a hand roller, thereby obtaining a laminate of embossed film / adhesive layer A / light guide layer.

[0238] The HC layer coating solution prepared in Manufacturing Example 3 was applied to one side of an acrylic film (substrate layer) with a refractive index of 1.51 and a thickness of 40 μm using a wire rod. After drying at 80°C for 1 minute, light with a wavelength of 360 nm and a flux of 300 mJ / cm² was used. 2 UV irradiation was performed to obtain an HC layer / acrylic film laminate. At this point, the thickness of the HC layer was 5 μm. The refractive index of the HC layer was 1.52.

[0239] The low refractive index coating solution prepared in Manufacturing Example 2 was coated onto the acrylic film surface of the HC layer / acrylic film laminate, dried at 100°C for 1 minute, and then subjected to light at a wavelength of 360 nm at 300 mJ / cm². 2 The dried coating layer was irradiated with UV light of varying intensity (energy) to obtain a laminate of HC layer / acrylic film / low refractive index layer. At this point, the refractive index of the low refractive index layer was 1.15 (thickness 1 μm).

[0240] On the low-refractive-index layer of the HC layer / acrylic film / low-refractive-index layer laminate prepared above, the adhesive B layer prepared in Manufacturing Example 5 is attached to obtain a laminate of HC layer / acrylic film / low-refractive-index layer / adhesive B layer / PET film. Two such laminates are prepared. The PET film of each laminate is peeled off and attached to both sides of the laminate of the above-prepared embossed film / adhesive A layer / light guide layer to manufacture the target light guide component.

[0241] (2) Construction of lighting device

[0242] An LED line light source (manufactured by Nichia Corporation, 0.4mm thick, side-view type) was installed on the side of the light guide layer of the light guide component to create an illumination device. Furthermore, a test was conducted at 12V.

[0243] Example 2

[0244] (1) Fabrication of light guide components

[0245] Production Figure 13A The light guide component 220AD_a is shown.

[0246] A mask with predefined openings on one side of an acrylic film with a refractive index of 1.51 and a thickness of 40 μm was coated with a coating liquid for forming a low refractive index layer, as described in Manufacturing Example 2. In this case, the photocoupled layer 80 formed used a mask where the low refractive index regions 80a were densely packed (approximately present low refractive index regions 80a) on the side closest to the light source, and became sparser (with more areas lacking low refractive index regions 80a) as it moved away from the light source. Light with a wavelength of 360 nm was used at 300 mJ / cm². 2The coated layer after drying is subjected to UV irradiation in an amount (energy) of light, and the mask plate is removed, thereby forming a low-refractive-index region 80a. A plan view of the formed low-refractive-index region 80a is shown in Figure 16 The point indicates a portion to which the low-refractive-index formation coating liquid is applied (there is also a pattern layer portion in the portion surrounded by the broken line, but it is omitted in the figure). The size of the point is, for example, 1 μm or more and 1000 μm or less. By providing such a light coupling layer 80, the area occupancy ratio of the recessed portion (internal space 14A, 64A) of the molding film can be made uniform over the entire surface.

[0247] The adhesive A solution is applied to the pattern layer, and a laminate of the acrylic film / low-refractive-index material pattern layer / adhesive A layer is obtained. Further, the concavo-convex surface of the concavo-convex molding film is attached to the adhesive A layer of the laminate, and a laminate of the acrylic film / low-refractive-index material pattern layer / adhesive A layer / concavo-convex molding film is obtained.

[0248] The adhesive B layer of the laminate of the HC layer / acrylic film / low-refractive-index layer / adhesive B layer prepared in Example 1 is attached to the concavo-convex molding film surface of the laminate of the acrylic film / low-refractive-index material pattern layer / adhesive A layer / concavo-convex molding film, and a laminate of the HC layer / acrylic film / low-refractive-index layer / adhesive B layer / concavo-convex molding film / adhesive A layer / low-refractive-index material pattern layer / acrylic film is obtained.

[0249] Further, the laminate and the light guide layer are attached in such a manner that the light guide layer and the acrylic film face each other with the adhesive B layer interposed therebetween, and a laminate of the HC layer / acrylic film / low-refractive-index layer / adhesive B layer / concavo-convex molding film / adhesive A layer / low-refractive-index material pattern layer / acrylic film / adhesive B layer / light guide layer is obtained. The adhesive B layer of the laminate of the HC layer / acrylic film / low-refractive-index layer / adhesive B layer prepared in Example 1 is attached to the light guide layer surface of the laminate, and a target light guide member is produced.

[0250] (2) Production of Illumination Device

[0251] The illumination device is produced in the same manner as in Example 1 (2).

[0252] Comparative Example 1

[0253] (1) Production of Light Guide Member

[0254] Figure 17 A schematic view of the light guide member 910A of Comparative Example 1 is shown.

[0255] The adhesive B layer of Production Example 5 is attached to the surface of the concavo-convex molding film of Production Example 1 on the side opposite to the concavo-convex surface. Then, the PET film of the adhesive B layer is peeled off, and the light guide layer is attached, and a target light guide member is produced.

[0256] (2) Construction of lighting device

[0257] The lighting device was made in the same manner as in Example 1(2).

[0258] Comparative Example 2

[0259] (1) Fabrication of light guide components

[0260] Figure 18 A schematic diagram showing the light guide component 920A of Comparative Example 2.

[0261] The embossed film surface of the laminate of the embossed film / adhesive layer A / light guide layer prepared in Example 1 is bonded to the adhesive layer B of the laminate of HC layer / acrylic film / adhesive layer B to fabricate the target light guide component.

[0262] (2) Construction of lighting device

[0263] The lighting device was made in the same manner as in Example 1(2).

[0264] Comparative Example 3

[0265] In addition to using patent document 2 Figure 10 Except for replacing the embossed film used in Example 1 with the embossed film disclosed in B, the light guide component and lighting device were fabricated in the same manner as in Example 1. Figure 19A This is a top view showing a portion of the textured film 92 used, viewed from the textured side. Additionally, Figure 19B Indicates along Figure 19A The cross-sectional view of 19B-19B' in the figure. When the embossed film 92 is viewed from the embossed side, the area of ​​the recess 94 accounts for 61% of the total area of ​​the embossed film 92.

[0266] [Confirmation of light leakage]

[0267] Before and after the scratch resistance test and the stain resistance test, light leakage around scratches and dirt was visually assessed for the lighting devices of Examples 1 and 2, and Comparative Examples 1, 2 and 3. Cases with no light leakage were rated as ○, and cases with light leakage were rated as ×.

[0268] [Confirmation of optical uniformity]

[0269] A 10mm wide and 120mm long strip of black adhesive tape (Nitto Denko vinyl tape) was attached to the center of the light-emitting surface of the light guide component. The luminance at a distance of 30mm from the light source and at a distance of 670mm from the light source was measured. A two-dimensional luminance meter (TOPCOM SR-5000HS) was used to measure the luminance. The luminance at a distance of 30mm from the light source (near the end) was set to 100%, and the ratio of the luminance at a distance of 670mm from the light source (far end) was measured. The results are shown in Table 1.

[0270] [Table 1]

[0271]

[0272] In Example 1, it is known that, because the low-refractive layer exists on both sides of the light guide layer, light is guided without loss of light due to contamination. It is further known that, even if a medium that absorbs light exists in the middle of the waveguide, light is transmitted without loss at the entrance and exit.

[0273] Further, in Example 2, it is known that, by patterning the low-refractive layer, light is extracted more uniformly at the entrance and exit.

[0274] [Building component]

[0275] The above-described sheet-shaped (or film-shaped) transparent lighting device is used as a building component. The lighting device itself can be used as a building component, or can be used as a part of a building component. The building component includes exterior and interior decorative uses. For example, it can be used as a window component, a wall component, a partition, a ceiling (skylight) component, a staircase component, a handrail component, a floor component. In addition, it can be used as a lighting device for streets, for security, for emergencies, for courtyards, for swimming pools (underwater), in warehouses, in factories, under eaves (outdoors). It is used as a transparent panel when not in use.

[0276] In addition, a function of changing the color of illumination and / or a function of changing the area of illumination can be added. The color or the area of illumination can also change over time. The type (color), number, and arrangement of LEDs used as light sources can be various. Of course, the shape, size, and thickness of the light guide layer can also be various.

[0277] In addition, by tiling a plurality of sheet-shaped lighting devices, as a larger lighting device, it can be used as a larger building component. In addition, a plurality of sheet-shaped lighting devices can also be used in layers.

[0278] By using the lighting device of the embodiment of the present application, a building component that is rich in design or entertainment can be provided.

[0279] Industrial applicability

[0280] According to the embodiment of the present application, a lighting device having a higher transmittance and a smaller haze value than in the past, and a light guide component for a lighting device are provided, and a lighting that is rich in design or entertainment is provided. According to the embodiment of the present application, a building component that can perform a lighting that is rich in design or entertainment is provided.

[0281] Explanation of reference numerals

[0282] 10, 10A, 10B: light guide layer;

[0283] 14, 14A, 14B, 64A, 64B: internal space

[0284] 20A, 20B: low refractive index layer

[0285] 30A, 30B, 30C: substrate layer

[0286] 40A, 40B: hard coat layer

[0287] 52, 54, 56, 58: adhesive layer

[0288] 100A, 100B, 200A, 200B: light guide member

[0289] 100A_L, 200A_L: illumination device

Claims

1. A light guide member for a lighting device, comprising: a light guide layer having a first principal surface, a second principal surface on the opposite side of the first principal surface, and a light-receiving side surface that receives light emitted from a light source; a light distribution control structure that is capable of causing a portion of light propagating within the light guide layer to be at least directed toward the first low refractive index layer side or the side opposite the first low refractive index layer; a visible light transmittance of 80% or more, and a haze value of less than 5%, the light distribution control structure being formed in a first direction conversion layer provided on the first principal surface side or the second principal surface side of the light guide layer, having a plurality of internal spaces formed with interfaces that cause light to be directed toward the first low refractive index layer side or the side opposite the first low refractive index layer by internal total reflection, the plurality of internal spaces being discretely arranged in a light guide direction of the light guide layer and a direction orthogonal to the light guide direction, and a proportion of an area of the plurality of internal spaces to an area of the light guide layer being 10% or less when the light guide layer is viewed from a normal direction of the first principal surface.

2. The light guide member for a lighting device according to claim 1, wherein the plurality of internal spaces are provided between the light guide layer and the first low refractive index layer with respect to the light distribution control structure. a first low refractive index layer disposed on the first main surface side of the light guide layer, having a refractive index n GP a small refractive index n L1 ; 3. The light guide member for a lighting device according to claim 1 or 2, wherein the light distribution control structure causes a portion of light propagating within the light guide layer to be at least directed toward the first low refractive index layer side.

4. The light guide member for a lighting device according to claim 1 or 2, wherein the light distribution control structure causes a portion of light propagating within the light guide layer to be at least directed toward the side opposite the first low refractive index layer side.

5. The light guide member for a lighting device according to claim 1 or 2, further comprising a first hard coat layer provided on the side of the first low refractive index layer opposite the light guide layer and having a hardness of pencil hardness H or more.

6. The light guide member for a lighting device according to claim 1 or 2, wherein a first base material layer is provided on the side of the first low refractive index layer opposite the light guide layer, and the first hard coat layer is formed on the side of the first base material layer opposite the first low refractive index layer.

7. The light guide member for a lighting device according to claim 1 or 2, further comprising a first light coupling layer provided between the light guide layer and the first direction conversion layer.

8. The light guide member for a lighting device according to claim 1 or 2, wherein the first direction conversion layer is a first prism sheet.

9. The light guide member for a lighting device according to claim 8, wherein the first prism sheet has a plurality of prisms that are arranged in a direction orthogonal to the light guide direction of the light guide layer.

10. The light guide member for a lighting device according to claim 9, wherein a second base material layer is provided on the side of the second low refractive index layer opposite the light guide layer, and the second hard coat layer is formed on the side of the second base material layer opposite the second low refractive index layer.

11. The light guide member for a lighting device according to claim 5, wherein the haze value of the first hard coat layer is greater than the haze value of the second hard coat layer.

12. The light guide member for a lighting device according to claim 1 or 2, wherein the first low refractive index layer has a refractive index of 1.3 or less. ​ ​ ​ ​ ​ ​ The first light coupling layer has a plurality of first low refractive index regions having a refractive index n GP a small refractive index n C1 . ​ Further provided is a second low refractive index layer disposed on the second main surface side of the light guide layer, having a refractive index n GP a small refractive index n L2 . ​ Further provided is a second hard coat layer disposed on the opposite side of the second low-refractive layer from the light guide layer, having a hardness H GP a high hardness H H2 . ​ ​ ​ Further provided is a second low refractive index layer disposed on the second main surface side of the light guide layer, having a refractive index n GP a small refractive index n L2 ； a second hard coat layer disposed on the side of the second low refractive index layer opposite the light guide layer, having a hardness H GP a high hardness H H2 , ​ ​ Further, a stain-proof layer having water repellency and / or oil repellency is provided as the outermost layer on the first main surface side or the second main surface side.

13. The light guide member for a lighting device according to claim 12, wherein Further, an anti-reflection layer is provided on the light guide layer side of the stain-proof layer.

14. A lighting device comprising: the light guide member for a lighting device according to any one of claims 1 to 13, and a light source that emits light toward the light-receiving side surface.

15. A building member having the light guide member for a lighting device according to any one of claims 1 to 13.

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