Light guide member for light emission device and light emission device

Abstract

A light guide member (100A) for a light emission device has: a first main surface; and a second main surface on the opposite side to the first main surface. The light guide member (100A) for a light emission device has: a light guide layer (10) having a light reception part (10a) that receives light emitted from a light source (LS), a third main surface (10b) on the first main surface side, and a fourth main surface (10c) on the second main surface side; and a light distribution control structure which has a plurality of internal spaces (IS) and in which the plurality of internal spaces (IS) each have formed therein an interface for directing, by total internal reflection, a portion of light propagating in the light guide layer (10) toward the first main surface side. In a plan view from a normal direction with respect to the first main surface, first regions (R1) in which the light distribution control structure is present and second regions (R2) in which the light distribution control structure is not present are disposed so as to define a predetermined drawing pattern.

Description

Light-guiding member for light-emitting device and light-emitting device

[0001] The present invention relates to a light-guiding member for a light-emitting device and a light-emitting device, and more particularly to a sheet-shaped light-guiding member for a light-emitting device and a light-emitting device.

[0002] In recent years, the use of next-generation semiconductor lighting (Solid State Lighting: SSL), typified by LED lighting, has been increasing. Lighting devices (which may also be called "light-emitting devices") are widely configured to include a light source such as an LED and a light guide plate.

[0003] There is a need for a light-emitting device that is transparent when turned off and can emit light in the form of letters or pictures when turned on. Known methods for realizing such a light-emitting device include forming a light-extracting structure (e.g., a fine prism or dot pattern) on only a part of a light guide plate by laser engraving or inkjet printing. Patent Document 1 discloses an example of such a light-emitting device, namely, a light-point display device in which a group of reflective dots in the form of letters or figures is formed on a light guide plate.

[0004] Japanese Patent Application Laid-Open No. 2004-069729

[0005] However, in conventional light-emitting devices, the design of the pattern density of the structure for extracting light involves a trade-off between the amount of light emitted from the light guide plate and the transparency of the light guide plate, making it difficult to increase transparency in order to ensure a sufficient amount of light.

[0006] Furthermore, when the light-emitting device described above is used in an automobile, it is conceivable to use, for example, window glass as a light guide plate, but in order to maintain the strength and transparency of the window glass, it is not possible to directly process the surface shape of the window glass, etc. Furthermore, because windshields and rear windows have curved shapes, it is difficult to process large areas due to equipment restrictions, etc.

[0007] An embodiment of the present invention aims to provide a light-emitting device that can emit light in a predetermined pattern and has sufficiently high transparency, and a light-guiding member for a light-emitting device that is suitable for use in such a light-emitting device.

[0008] According to an embodiment of the present invention, the following solutions are provided:

[0009] [Item 1] A light-guiding member for a light-emitting device having a first main surface and a second main surface opposite to the first main surface, comprising: a light-receiving section that receives light emitted from a light source; a light-guiding layer that has a third main surface on the side of the first main surface and a fourth main surface on the side of the second main surface; and a light distribution control structure having a plurality of internal spaces, the plurality of internal spaces forming interfaces that direct a portion of light propagating within the light-guiding layer toward the first main surface by total internal reflection; wherein, when viewed in a planar view from a direction normal to the first main surface, a first region in which the light distribution control structure is present and a second region in which the light distribution control structure is not present are arranged to define a predetermined pattern.

[0010] [Item 2] A light-guiding member for a light-emitting device according to item 1, comprising a shaped film having a fifth main surface having a plurality of recesses, the plurality of recesses including a plurality of first recesses located in the first region that are unfilled and a plurality of second recesses located in the second region that are substantially filled, and the plurality of internal spaces being defined by the plurality of first recesses of the shaped film.

[0011] [Item 3] A light-guiding member for a light-emitting device according to Item 2, which has an adhesive layer arranged on the fifth main surface side of the shaped film, the plurality of first recesses are not filled with the adhesive layer, the plurality of second recesses are substantially filled with the adhesive layer, and the plurality of internal spaces are defined by the plurality of first recesses of the shaped film and the adhesive layer.

[0012] [Item 4] A light-guiding member for a light-emitting device according to item 1, comprising a shaped film having a fifth main surface with a plurality of recesses, the plurality of recesses being formed only in the first region of the first region and the second region, and the plurality of internal spaces being defined by the plurality of recesses of the shaped film.

[0013] [Item 5] A light-guiding member for a light-emitting device according to Item 4, having an adhesive layer arranged on the fifth main surface side of the shaping film, wherein the plurality of internal spaces are defined by the plurality of recesses of the shaping film and the adhesive layer.

[0014] [Item 6] The light-guiding member for a light-emitting device according to any one of Items 1 to 5, wherein the plurality of internal spaces are formed in a direction changing layer provided on the third principal surface side or the fourth principal surface side of the light-guiding layer.

[0015] [Item 7] The light-guiding member for a light-emitting device according to Item 6, further comprising an optical coupling layer provided between the light-guiding layer and the direction-changing layer, the optical coupling layer having a plurality of low-refractive-index regions having a refractive index lower than that of the light-guiding layer.

[0016] [Item 8] A light-guiding member for a light-emitting device having a first main surface and a second main surface opposite to the first main surface, comprising: a light-receiving section that receives light emitted from a light source; a light-guiding layer that has a third main surface on the first main surface side and a fourth main surface on the second main surface side; and a light distribution control structure having a plurality of internal spaces, the plurality of internal spaces forming an interface that directs a portion of light propagating in the light-guiding layer toward the first main surface side by total internal reflection, the plurality of internal spaces being formed in a direction changing layer provided on the third main surface side or the fourth main surface side of the light-guiding layer, the light-guiding member for a light-emitting device further comprising: an optical coupling layer provided between the light-guiding layer and the direction changing layer, the optical coupling layer having a plurality of low-refractive-index regions having a refractive index smaller than that of the light-guiding layer, A light-guiding member for a light-emitting device, wherein, when viewed in a plane from a direction normal to the first main surface, a first region in which the optical coupling layer is present and a second region in which the optical coupling layer is not present are arranged to define a predetermined pattern.

[0017] [Item 9] The light-guiding member for a light-emitting device according to Item 8, further comprising a plurality of porous regions provided between the light-guiding layer and the direction-changing layer and having an internal void structure, the plurality of porous regions being formed only in the first region of the first region and the second region, and the plurality of low refractive index regions being defined by the plurality of porous regions.

[0018] [Item 10] The light-guiding member for a light-emitting device according to Item 8, further comprising: a plurality of porous regions provided between the light-guiding layer and the direction-changing layer and having a void structure therein; the plurality of porous regions including a plurality of first porous regions located within the first region and having an unfilled void structure; and a plurality of second porous regions located within the second region and having a substantially filled void structure; and the plurality of low refractive index regions are defined by the plurality of first porous regions.

[0019] [Item 11] The light-guiding member for a light-emitting device according to Item 10, further comprising an adhesive layer provided in contact with the plurality of porous regions, wherein the void structures of the plurality of first porous regions are not filled with the adhesive layer, and the void structures of the plurality of second porous regions are substantially filled with the adhesive layer.

[0020] [Item 12] The light-guiding member for a light-emitting device according to any one of Items 1 to 11, wherein the light-guiding layer is configured so that its thickness increases with increasing distance from the light-receiving section.

[0021] [Item 13] A light emitting device comprising: the light guide member for a light emitting device according to any one of items 1 to 12; and a light source that emits light toward the light receiving portion.

[0022] According to an embodiment of the present invention, it is possible to provide a light emitting device that can emit light in a predetermined pattern and has sufficiently high transparency, and a light guiding member for a light emitting device that is suitable for use in such a light emitting device.

[0023] FIG. 1 is a cross-sectional view schematically showing a light emitting device 100A_L according to an embodiment of the present invention. FIG. 2 is a plan view showing an example of a first region R1 and a second region R2 of the light emitting device 100A_L. FIG. 3 is a plan view schematically showing the light emitting device 100A_L. FIG. 4 is a cross-sectional view schematically showing an internal space IS of the light distribution control structure of the light emitting device 100A_L. FIG. 5 is a plan view schematically showing the internal space IS. FIG. 6 is a cross-sectional view schematically showing the light emitting device 100A_L. FIG. 7 is a cross-sectional view schematically showing the light emitting device 100B_L according to an embodiment of the present invention. FIG. 8 is a cross-sectional view schematically showing the light emitting device 100C_L according to an embodiment of the present invention. FIG. 9 is a cross-sectional view schematically showing the light emitting device 100D_L according to an embodiment of the present invention. FIG. 10 is a cross-sectional view schematically showing the light emitting device 100E_L according to an embodiment of the present invention. FIG. 11 is a cross-sectional view schematically showing the light emitting device 100F_L according to an embodiment of the present invention. FIG. 12 is a cross-sectional view schematically showing the light emitting device 100F_L.

[0024] Hereinafter, a light-guiding member for a light-emitting device and a light-emitting device according to an embodiment of the present invention will be described with reference to the drawings. Note that the light-guiding member for a light-emitting device and the light-emitting device according to the embodiment of the present invention are not limited to those exemplified in the following description.

[0025] First Embodiment [Configuration of Light-Guiding Member for Light-Emitting Device and Light-Emitting Device] A light-emitting device (illumination device) 100A_L in this embodiment will be described with reference to Fig. 1. Fig. 1 is a cross-sectional view that schematically shows the light-emitting device 100A_L.

[0026] As shown in FIG. 1, the light emitting device 100A_L includes a light source LS and a light guide member 100A.

[0027] The light source LS is, for example, an LED device. A plurality of LED devices may be used as the light source LS. The plurality of LED devices may be arranged in the X direction, for example.

[0028] The light guide member 100A is in a sheet shape having a first main surface and a second main surface opposite the first main surface. In FIG. 1 , the lower main surface is the first main surface, and the upper main surface is the second main surface. Here, the term "sheet-like" includes plate-like and film-like shapes, and does not matter regarding the rigidity (flexibility) and thickness of the sheet. The sheet-like light guide member can be used in various forms, such as a roll.

[0029] The light-guiding member 100A receives light emitted from the light source LS, propagates the light in the Y direction, and emits the light in the −Z direction. Therefore, the first main surface of the light-guiding member 100A functions as a light-emitting surface. Of course, the propagation direction of the light varies (distribution) from the Y direction, and the emission direction of the light also varies (distribution) from the −Z direction. Note that a coupling optical system may be provided between the light-guiding member 100A and the light source LS to efficiently guide the light emitted from the light source LS to the light-guiding member 100A.

[0030] The light-guiding member 100A has a light-guiding layer 10 and a light distribution control structure having a plurality of internal spaces IS.

[0031] The light guide layer 10 has a light receiving portion that receives light emitted from the light source LS, a third main surface 10b located on the first main surface side (i.e., the light emitting surface side), and a fourth main surface 10c located on the second main surface side (i.e., the side opposite the light emitting surface side). In the example shown, the light receiving portion of the light guide layer 10 is the side surface (light receiving side surface) 10a of the light guide layer 10 that faces the light source LS. In addition, in the example shown, the light guide layer 10 is located on the outermost surface on the second main surface side of the light guide member 100A, and therefore the fourth main surface 10c of the light guide layer 10 is the second main surface of the light guide member 100A.

[0032] The plurality of internal spaces IS of the light distribution control structure form interfaces that direct a portion of the light propagating within the light guide layer 10 toward the first principal surface by total internal reflection (TIR). Each internal space IS has a first inclined surface ISa that directs a portion of the light propagating within the light guide layer 10 toward the first principal surface by total internal reflection, and a second inclined surface ISb opposite to the first inclined surface ISa.

[0033] In the illustrated light-guiding member 100A, the light distribution control structure having a plurality of internal spaces IS is formed in a direction-changing layer 60A provided on the third main surface 10b side of the light-guiding layer 10. The direction-changing layer 60A is composed of a shaped film 62A having a fifth main surface 62a with a plurality of recesses 64, and an adhesive layer 52 arranged on the fifth main surface 62a side of the shaped film 62A. The adhesive layer 52 is located between the shaped film 62A and the light-guiding layer 10, and the adhesive layer 52 bonds the light-guiding layer 10 and the shaped film 62A together.

[0034] In the illustrated example, an adhesive layer 54 and a base layer 30 are disposed in this order on the first main surface side of the direction conversion layer 60A, and the shaped film 62A and the base layer 30 are bonded together by the adhesive layer 54. The light guide layer 10 and the base layer 30 may be transparent substrates or films. Preferred configurations of the light guide layer 10, the base layer 30, the shaped film 62A, and the adhesive layers 52 and 54 will be described later.

[0035] Light-emitting device 100A_L has a region R1 (hereinafter referred to as the "first region") in which the light distribution control structure is present, and a region R2 (hereinafter referred to as the "second region") in which the light distribution control structure is not present. First region R1 and second region R2 are arranged so as to define a predetermined pattern when viewed in a plan view from the normal direction to the first main surface. Here, the "pattern" includes letters, numbers, symbols, pictures, designs, combinations of these, etc.

[0036] An example of the arrangement of the first region R1 and the second region R2 is shown in Fig. 2. Fig. 2 shows a state in which the light emitting device 100A_L is lit.

[0037] As shown in Fig. 2, the first region R1 where the light distribution control structure is present is a region that emits light in the lit state (light-emitting region), and the second region R2 where the light distribution control structure is not present is a region that does not substantially emit light in the lit state (non-light-emitting region). Needless to say, the patterns defined by the first region R1 and the second region R2 are not limited to those exemplified in Fig. 2.

[0038] In this embodiment, the first region R1 and the second region R2 are distinguished by whether or not the recesses 64 of the shaped film 62A are filled with the adhesive layer 52. As shown in Fig. 1, the recesses 64 of the shaped film 62A include a plurality of first recesses 64A located in the first region R1 that are not filled with the adhesive layer 52, and a plurality of second recesses 64B located in the second region R2 that are substantially filled with the adhesive layer 52.

[0039] The multiple internal spaces IS are defined by the multiple first recesses 64A of the shaping film 62A and the adhesive layer 52. That is, the region where the first recesses 64A that are not filled with the adhesive layer 52 are located is the first region R1 where the light distribution control structure exists. In contrast, the region where the second recesses 64B that are substantially filled with the adhesive layer 52 are located is the second region R2 that does not function as a light distribution control structure (that is, where no light distribution control structure exists).

[0040] By adjusting the cross-sectional shape, size, arrangement density, and distribution of the internal space IS, the light distribution of the light emitted from the first region R1 can be controlled. The internal space IS is typically an air cavity filled with air. As a light distribution control structure having multiple internal spaces IS, for example, the light distribution structure described in International Publication No. 2019 / 087118 can be used. The entire disclosure of International Publication No. 2019 / 087118 is incorporated herein by reference.

[0041] Furthermore, the visible light transmittance and haze value of the light-guiding member 100A can be controlled by adjusting the cross-sectional shape, size, arrangement density, and distribution of the internal space IS. The visible light transmittance of the light-guiding member 100A is, for example, 60% or more, preferably 80% or more. The haze value of the light-guiding member 100A is, for example, less than 30%, preferably less than 10%. Here, visible light is defined as light having a wavelength of 380 nm or more and 780 nm or less. The visible light transmittance and haze value can be measured, for example, using a haze meter (manufactured by Murakami Color Research Laboratory: product name HM-150). From the perspective of viewing an object (display) through the light-emitting device 100A_L (light-guiding member 100A), the visible light transmittance of the light-guiding member 100A is preferably 60% or more, and the haze value of the light-guiding member 100A is preferably less than 30%.

[0042] When the light guide member 100A is viewed in a plan view from the normal direction of the first main surface, the ratio of the area of ​​the plurality of internal spaces IS to the area of ​​the first region R1 (occupancy rate) is preferably 1% to 80%, and more preferably 1% to 50%. From the viewpoint of obtaining a low haze value, the occupancy rate of the internal spaces IS is preferably 30% or less, and more preferably 10% or less.

[0043] Examples of the shape and arrangement of the internal space IS will be described with reference to Figures 3, 4, and 5. Figure 3 is a plan view schematically showing the light-emitting device 100A_L. Figure 4 is a cross-sectional view schematically showing the internal space IS, and Figure 5 is a plan view schematically showing the internal space IS.

[0044] As shown in FIG. 3 , the multiple internal spaces IS may be discretely arranged in, for example, the light guide direction (Y direction) of the light guide layer 10 and a direction intersecting the light guide direction. The discrete arrangement may have periodicity (regularity) in at least one direction, or may not have regularity. However, from the viewpoint of mass productivity, it is preferable that the multiple internal spaces IS be uniformly arranged in the first region R1. For example, in the example shown in FIG. 3 , multiple internal spaces IS having substantially the same shape and convex curved surfaces in the same direction are discretely and periodically arranged in the light guide direction (Y direction) of the light guide plate 10 and the direction perpendicular to the light guide direction (X direction). In this case, the pitch Px of the internal spaces IS in the X direction is preferably, for example, 10 μm or more and 500 μm or less, and the pitch Py of the internal spaces IS in the Y direction is preferably, for example, 10 μm or more and 500 μm or less. In the example shown in FIG. 3 , internal spaces IS are further provided, arranged at a half pitch in each of the Y direction and the X direction.

[0045] As shown in FIG. 3 , when viewed from a plane normal to the first main surface of the light-guiding member 100A, the first inclined surface ISa forms a curved surface convex toward the light source LS. When a plurality of LED devices arranged in the X direction are used as the light source LS, the light emitted from each LED device spreads in the Y direction. Therefore, the first inclined surface ISa acts uniformly on the light if the first inclined surface ISa has a curved surface convex toward the light source LS. Note that if a coupling optical system is provided between the light source LS and the light-receiving side surface 10a of the light-guiding layer 10 to allow highly parallel light (light with a small spread in the Y direction) to enter, the first inclined surface ISa may be parallel to the X direction. Furthermore, instead of the discrete internal spaces IS, an internal space such as a groove (e.g., a triangular prism) extending in the X direction may also be used.

[0046] As shown in FIG. 4, the cross-sectional shape of the internal space IS (the cross-sectional shape perpendicular to the X direction in FIG. 1 and parallel to the YZ plane) is, for example, a triangle having an apex angle on the first main surface side (-Z direction in FIG. 1) of the light-guiding member 100A. The inclination angle θa of the first inclined surface ISa on the light source LS side is, for example, 10° or more and 70° or less. If the inclination angle θa is less than 10°, the controllability of the light distribution may decrease and the light extraction efficiency may also decrease. On the other hand, if the inclination angle θa exceeds 70°, for example, processing of the shaped film may become difficult. Furthermore, the inclination angle θb of the second inclined surface ISb is, for example, 50° or more and 100° or less. If the inclination angle θb is less than 50°, stray light may occur in an unintended direction. On the other hand, if the inclination angle θb exceeds 100°, for example, processing of the shaped film may become difficult. Note that the cross-sectional shape of the internal space IS is not limited to the triangle exemplified here, but may be a trapezoid, etc.

[0047] As shown in Figure 5, the two-dimensional size of the internal space IS is determined by the length L and width W of the internal space IS. The length L of the internal space IS is preferably, for example, 10 µm or more and 500 µm or less. The width W of the internal space IS is preferably, for example, 1 µm or more and 100 µm or less. The length L of the internal space IS is, for example, at least twice the width W of the internal space IS. Furthermore, from the viewpoint of light extraction efficiency, the height H of the internal space IS (see Figure 4) is preferably, for example, 1 µm or more and 100 µm or less.

[0048] As described above, in the light emitting device 100A_L of this embodiment, the first region R1 where the light distribution control structure is present and the second region R2 where the light distribution control structure is not present are arranged to define a predetermined pattern, so that light can be emitted in the form of a predetermined pattern, thereby achieving illumination (light emission) that is rich in design and entertainment value.

[0049] Furthermore, the light-emitting device 100A_L of this embodiment has a light distribution control structure that has multiple internal spaces IS (i.e., utilizes total internal reflection), and therefore can achieve high transparency (visible light transmittance). The light-guiding member 100A of the light-emitting device 100A_L can have a visible light transmittance of, for example, 60% or more (preferably 80% or more).

[0050] The sheet-like light-emitting device 100A_L is preferably used as an in-vehicle light-emitting device by being attached to the window glass of an automobile. Furthermore, since the light-emitting device 100A_L having the above-described configuration is flexible, it can also be attached to curved glass. Therefore, the light-emitting device 100A_L can be disposed on a large-area curved glass such as a windshield or rear glass. The window glass may be used as part of the light-emitting device 100A_L (the light-guiding layer 10 or the base layer 30). Furthermore, the light-emitting device 100A_L is not limited to in-vehicle applications and can also be used as a show window, etc.

[0051] As will be described later, a light distribution control structure having a plurality of internal spaces IS may be formed in the light guide layer 10. However, as in the present embodiment, by forming a light distribution control structure having a plurality of internal spaces IS in the direction converting layer 60A, it is easy to achieve high transparency in the off state, high light utilization efficiency in the on state, high reliability, and high directivity to one side.

[0052] When forming an internal space IS in the light-guiding layer 10, for example, as described below, it is possible to form a fine pattern (recess) defining the internal space IS in the film by laser processing. However, in this case, it may be difficult to form a suitable anisotropic shape for the internal space IS. If the anisotropic shape is not suitable, external light (ambient light) may be reflected in various directions by irregular interfaces, which may result in low transparency in the off state. Furthermore, directivity in the on state may also be reduced, resulting in a decrease in light utilization efficiency. Furthermore, even if a suitable anisotropic shape is formed, deterioration may occur in the area surrounding the recess due to uneven energy of the laser light. Since the refractive index changes in the affected area, scattering may occur due to the difference in refractive index. This may adversely affect transparency and directivity. Furthermore, reliability may be reduced. In contrast, by forming a light distribution control structure having multiple internal spaces IS in the direction conversion layer 60A, it is easy to achieve high transparency in the off state, high light utilization efficiency in the on state, high reliability, and high directivity to one side.

[0053] [Examples of Preferred Configurations of Light Guide Layer, Base Layer, Shape-Duplicating Film, and Adhesive Layer] The light guide layer 10 can be formed of a known material with high transmittance to visible light. The light guide layer 10 is formed of, for example, an acrylic resin such as polymethyl methacrylate (PMMA), a polycarbonate (PC) resin, a cycloolefin resin, or glass (for example, quartz glass, alkali-free glass, or borosilicate glass). The refractive index n of the light guide layer 10 is ＧＰ is, for example, 1.40 or more and 1.80 or less. Unless otherwise specified, the refractive index refers to a refractive index measured with an ellipsometer at a wavelength of 550 nm. The thickness of the light guide layer 10 can be set appropriately depending on the application. The thickness of the light guide layer 10 is, for example, 0.05 mm or more and 50 mm or less.

[0054] The thickness of the substrate layer 30 is, for example, 1 μm to 1000 μm, preferably 10 μm to 100 μm, and more preferably 20 μm to 80 μm. The refractive index of the substrate layer 30 is preferably 1.40 to 1.70, and more preferably 1.43 to 1.65.

[0055] The shaped film 62A for forming the internal space IS can be produced, for example, by the method described in JP-A-2013-524288. Specifically, for example, the surface of a polymethyl methacrylate (PMMA) film is coated with lacquer (e.g., FineCure RM-64 manufactured by Sanyo Chemical Industries, Ltd.), an optical pattern is embossed on the film surface containing the lacquer, and then the lacquer is cured to produce the shaped film 62A.

[0056] The thicknesses of the adhesive layers 52 and 54 are each independently, for example, from 0.1 μm to 100 μm, preferably from 0.3 μm to 100 μm, and more preferably from 0.5 μm to 50 μm. The refractive indexes of the adhesive layers 52 and 54 are each independently preferably from 1.42 to 1.60, and more preferably from 1.47 to 1.58. The refractive indexes of the adhesive layers 52 and 54 are preferably close to the refractive indexes of the light guide layer 10, base layer 30, or shaping film 62A that they contact, and the absolute value of the difference in refractive index is preferably 0.2 or less.

[0057] In this specification, the term "adhesive" is used to include pressure-sensitive adhesives (also called pressure-sensitive adhesives). 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 may be used alone or in combination of two or more.

[0058] The adhesive layer 52 can preferably be bonded without filling the first recess 64A on the surface of the shaped film 62A. Suitable adhesives for forming the adhesive layer 52 include those described in International Publication Nos. 2021 / 167090, 2021 / 167091, or International Application PCT / JP2022 / 004554 by the present applicant. The entire disclosures of these applications are incorporated herein by reference. In particular, polyester-based adhesives described in International Application PCT / JP2022 / 004554 are preferred.

[0059] In order for the adhesive layer 52 to substantially fill the second recess 64B without filling the first recess 64A among the plurality of recesses 64 of the shaped film 62A, for example, a mask having a mask pattern (openings corresponding to the first region R1) corresponding to the arrangement of the first region R1 and the second region R2 may be used when the light guide layer 10 and the shaped film 62A are bonded together by a laminator via the adhesive layer 52. The bonding conditions (such as the nip pressure of the laminator) may be appropriately set depending on the specifications of the adhesive used, the size of the recess 64, etc.

[0060] The second recess 64B of the shaping film 62A does not necessarily need to be completely filled with the adhesive layer 52, but may be substantially filled to the extent that it does not function as a light distribution control structure.

[0061] [Other Examples of Second Recesses] In the above example, the second recesses 64B of the shaped film 62A are filled with an adhesive layer 52 for bonding the light guide layer 10 and the shaped film 62A. However, the second recesses 64B may be substantially filled with some material other than the adhesive layer 52 so as not to function as a light distribution control structure. The refractive index of the material filling the second recesses 64B is preferably close to the refractive index of the shaped film 62A, and the absolute value of the difference in refractive index is preferably 0.2 or less. After selectively filling some of the recesses 64 (recesses 64 that become the second recesses 64B) of the shaped film 62A with some material (e.g., adhesive), the light guide layer 10 and the shaped film 62A are laminated together, for example, by bonding the light guide layer 10 and the shaped film 62A via the adhesive layer 52, thereby obtaining a configuration in which the first recesses 64A and the second recesses 64B are mixed.

[0062] [Other Examples of Directional Change Layer] While FIG. 1 shows an example in which a light distribution control structure is formed on a direction change layer 60A provided on the third main surface 10b side of the light guide layer 10, as shown in FIG. 6, a light distribution control structure may also be formed on a direction change layer 60A' provided on the fourth main surface 10c side of the light guide layer 10. The direction change layer 60A' is composed of a shaped film 62A having a fifth main surface 62a with a plurality of recesses 64 and an adhesive layer 52 arranged on the fifth main surface 62a side of the shaped film 62A. A base layer 30 is arranged on the side of the adhesive layer 52 opposite the shaped film 62A, and the shaped film 62A and the base layer 30 are bonded together by the adhesive layer 52. The light guide layer 10 and the shaped film 62A are bonded together by an adhesive layer 54 arranged on the fourth main surface 10c side of the light guide layer 10. In the example shown in FIG. 6, the light guide layer 10 is located on the outermost surface of the light guide member 100A on the first main surface side, and therefore the third main surface 10b of the light guide layer 10 is the first main surface of the light guide member 100A.

[0063] 7 , in addition to the light source LS that emits light toward the light-receiving side surface 10a of the light guide layer 10, a further light source LS′ that emits light toward an end face of the base layer 30 (an end face located on the same side as the light-receiving side surface 10a of the light guide layer 10) may be provided. In this case, it can be said that the base layer 30 functions as a further light guide layer.

[0064] Second Embodiment A light emitting device 100B_L according to a second embodiment will be described with reference to Fig. 8. Fig. 8 is a cross-sectional view schematically illustrating the light emitting device 100B_L. The following description will focus on differences between the light emitting device 100B_L according to the second embodiment and the light emitting device 100A_L according to the first embodiment.

[0065] 8, the light-guiding member 100B included in the light-emitting device 100B_L has a light distribution control structure having a plurality of internal spaces IS, similar to the light-guiding member 100A of the light-emitting device 100A_L. The light distribution control structure having a plurality of internal spaces IS is formed in a direction changing layer 60B provided on the third main surface 10b side of the light-guiding layer 10. The direction changing layer 60B is composed of a shaped film 62B having a fifth main surface 62a with a plurality of recesses 64, and an adhesive layer 52 arranged on the fifth main surface 62a side of the shaped film 62B.

[0066] Light emitting device 100B_L has a first region R1 in which a light distribution control structure is present and a second region R2 in which a light distribution control structure is not present. First region R1 and second region R2 are arranged so as to define a predetermined pattern when viewed in a plan view from the normal direction to the first main surface.

[0067] In this embodiment, the first region R1 and the second region R2 are distinguished by whether or not the recesses 64 are formed in the shaping film 62B. As shown in Figure 8, the recesses 64 of the shaping film 62B are formed only in the first region R1 of the first region R1 and the second region R2 (i.e., selectively in the first region R1).

[0068] The multiple internal spaces IS are defined by the multiple recesses 64 of the shaped film 62B and the adhesive layer 52. Therefore, the region where the recesses 64 exist is the first region R1 where the light distribution control structure exists. In contrast, the region where the recesses 64 do not exist is the second region R2 where the light distribution control structure does not function (i.e., no light distribution control structure exists).

[0069] Like the light emitting device 100A_L of the first embodiment, the light emitting device 100B_L of this embodiment can emit light in a predetermined pattern and can also achieve high transparency (visible light transmittance).

[0070] Third Embodiment A light emitting device 100C_L according to the third embodiment will be described with reference to Fig. 9. Fig. 9 is a cross-sectional view schematically illustrating the light emitting device 100C_L. The following description will focus on the differences between the light emitting device 100C_L according to the third embodiment and the light emitting device 100A_L according to the first embodiment.

[0071] 9 , the light-guiding member 100C included in the light-emitting device 100C_L has a light distribution control structure having a plurality of internal spaces IS, similar to the light-guiding member 100A of the light-emitting device 100A_L. The light distribution control structure having a plurality of internal spaces IS is formed in a direction changing layer 60A provided on the third main surface 10b side of the light-guiding layer 10. This direction changing layer 60A has the same configuration as the direction changing layer 60A of the light-emitting device 100A_L of the first embodiment.

[0072] The light guide member 100C further includes an optical coupling layer 80 provided between the light guide layer 10 and the direction changing layer 60A. The optical coupling layer 80 has a refractive index n ＧＰ A refractive index n smaller than Ｃ Each of the low refractive index regions 80a is formed in the shape of a dot having a size of, for example, 1 μm or more and 1000 μm or less.

[0073] The optical coupling layer 80 having a plurality of low refractive index regions 80a is supported by a base material layer 31, and the light guide layer 10 and the base material layer 31 are bonded together by an adhesive layer 56. The base material layer 31 and the shaped film 62A of the direction conversion layer 60A are bonded together by an adhesive layer 52.

[0074] In the light-emitting device 100C_L of this embodiment, the optical coupling layer 80 having a plurality of low-refractive-index regions 80a is provided, thereby enabling light propagating through the light-guiding layer 10 to be more selectively and efficiently guided to the direction-changing layer 60A. Furthermore, by adjusting the arrangement density of the plurality of low-refractive-index regions 80a, the uniformity of the light emitted from the first region R1 can be controlled. For example, the low-refractive-index regions 80a can be arranged so that they are denser on the light source LS side and sparser as they move away from the light source LS, thereby improving the uniformity of the light.

[0075] [Example of a Preferred Configuration of the Optical Coupling Layer (Low Refractive Index Region)] The refractive index n of the low refractive index region 80a Ｃ is preferably 1.05 or more and 1.30 or less, and more preferably 1.05 or more and 1.25 or less. ＧＰ and the refractive index n of the low refractive index region 80a Ｃ The difference between the refractive index n and the refractive index n is preferably 0.20 or more, more preferably 0.23 or more, and even more preferably 0.25 or more. Ｃ The low refractive index region 80a having a refractive index of 1.30 or less may be, for example, a porous region having a void structure therein. The thickness of the low refractive index region 80a is, for example, 0.3 μm or more and 5 μm or less.

[0076] When the low refractive index region 80a is a porous region, its porosity is preferably 35 vol% or more, more preferably 38 vol% or more, and particularly preferably 40 vol% or more. Within this range, a low refractive index region 80a with a particularly low refractive index can be formed. The upper limit of the porosity is, for example, 90 vol% or less, preferably 75 vol% or less. Within this range, a low refractive index region 80a with excellent strength can be obtained. The porosity is calculated from the refractive index value measured with an ellipsometer using the Lorentz-Lorenz formula.

[0077] For the low refractive index region 80a, for example, a low refractive index layer having a void structure disclosed in International Publication No. 2019 / 146628 can be used. The entire disclosure of International Publication No. 2019 / 146628 is incorporated herein by reference. Specifically, the low refractive index region 80a having a void structure may contain silica particles, silica particles having micropores, approximately spherical particles such as hollow silica nanoparticles, fibrous particles such as cellulose nanofibers, alumina nanofibers, and silica nanofibers, and flat particles such as nanoclay composed of bentonite. The low refractive index region 80a having a void structure may be a porous body formed by direct chemical bonding of particles (e.g., microporous particles). Furthermore, at least a portion of the particles constituting the low refractive index region 80a having a void structure may be bonded to each other via a small amount (e.g., less than the mass of the particles) of a single binder component. The porosity and refractive index n of the low refractive index region 80a Ｃ can be adjusted by the particle size, particle size distribution, etc. of the particles that make up the low refractive index region 80a.

[0078] Methods for obtaining the low refractive index region 80a having a void structure include, for example, methods described in JP 2010-189212 A, JP 2008-040171 A, JP 2006-011175 A, WO 2004 / 113966 A, and references thereto. The disclosures of JP 2010-189212 A, JP 2008-040171 A, JP 2006-011175 A, and WO 2004 / 113966 A are all incorporated herein by reference.

[0079] A porous silica body can be suitably used as the low refractive index region 80a having a void structure. The porous silica body can be produced by, for example, the following methods. Examples include a method of hydrolyzing and polycondensing a silicon compound; hydrolyzable silanes and / or silsesquioxane, and at least one of their partial hydrolyzates and dehydrated condensates; a method using porous particles and / or hollow fine particles; a method of producing an aerogel layer by utilizing the springback phenomenon; and a method using a pulverized gel in which a gel-like silicon compound obtained by a sol-gel method is pulverized and the resulting pulverized microporous particles are chemically bonded together with a catalyst or the like. However, the low refractive index region 80a is not limited to a porous silica body, and the production method is not limited to the exemplified production method; any production method may be used. The silsesquioxane may be (RSiO １．５ , R is a hydrocarbon group) as a basic structural unit, and ２ Although it is strictly different from silica, which has silsesquioxane as a basic structural unit, it has something in common with silica in that it has a network structure cross-linked by siloxane bonds. Therefore, in this specification, porous materials containing silsesquioxane as a basic structural unit are also referred to as porous silica materials or silica-based porous materials.

[0080] The porous silica material can be composed of microporous particles of a gel-like silicon compound bonded to one another. Examples of the microporous particles of the gel-like silicon compound include pulverized gel-like silicon compounds. The porous silica material can be formed, for example, by applying a coating liquid containing pulverized gel-like silicon compounds to a substrate. The pulverized gel-like silicon compounds can be chemically bonded (e.g., siloxane bonded) by, for example, the action of a catalyst, light irradiation, heating, etc.

[0081] (Embodiment 4) A light emitting device 100D_L according to this embodiment will be described with reference to Fig. 10. Fig. 10 is a cross-sectional view schematically showing the light emitting device 100D_L. The following description will focus on the differences between the light emitting device 100D_L according to this embodiment and the light emitting device 100C_L according to embodiment 3.

[0082] 10 , the light-guiding member 100D included in the light-emitting device 100D_L has a light distribution control structure having a plurality of internal spaces IS. The light distribution control structure having a plurality of internal spaces IS is formed in a direction changing layer 60C provided on the third main surface 10b side of the light-guiding layer 10. The direction changing layer 60C is composed of a shaped film 62A having a fifth main surface 62a with a plurality of recesses 64, and an adhesive layer 52 arranged on the fifth main surface 62a side of the shaped film 62A.

[0083] The plurality of recesses 64 of the shaped film 62A are formed over substantially the entire light-guiding member 100D in a plan view, and are not filled with the adhesive layer 52. Therefore, the plurality of internal spaces IS are provided over substantially the entire light-guiding member 100D in a plan view.

[0084] The light guide member 100D further includes an optical coupling layer 80 provided between the light guide layer 10 and the direction changing layer 60C. The optical coupling layer 80 has a refractive index n ＧＰ A refractive index n smaller than Ｃ The refractive index of the semiconductor laser 80 is 1.0 .mu.m.

[0085] The light emitting device 100D_L of this embodiment has a region R1' (hereinafter referred to as the "first region") where the optical coupling layer 80 is present, and a region R2' (hereinafter referred to as the "second region") where the optical coupling layer 80 is not present. The first region R1' and the second region R2' are arranged so as to define a predetermined pattern when viewed in a plan view from the normal direction to the first main surface. Although not shown here, the first region R1' and the second region R2' can be arranged in the same manner as the first region R1 and the second region R2 shown in FIG. 2.

[0086] In the first region R1' where the optical coupling layer 80 is present, light propagating within the light guide layer 10 is less likely to reach the light distribution control structure (internal space IS) due to total reflection at the optical coupling layer 80. Therefore, the first region R1' where the optical coupling layer 80 is present is a region (low-brightness light-emitting region) that emits light at a relatively low luminance (or does not emit light substantially) in the lit state. In contrast, the second region R2' where the optical coupling layer 80 is not present is a region (high-brightness light-emitting region) that emits light at a relatively high luminance in the lit state.

[0087] Here, each low-refractive-index region 80a is a porous region 81 having a void structure therein. In this embodiment, the first region R1′ and the second region R2′ are distinguished by whether or not a porous region 81 is formed. As shown in FIG. 10 , the plurality of porous regions 81 are formed only in the first region R1′ of the first region R1′ and the second region R2′ (i.e., selectively in the first region R1′). As already described, the plurality of low-refractive-index regions 80a are the plurality of porous regions 81 having a void structure therein (i.e., are defined by the plurality of porous regions 81). Therefore, the region where the porous region 81 is present is the first region R1′ where the optical coupling layer 80 is present, and the region where the porous region 81 is not present is the second region R2′ where the optical coupling layer 80 is not present.

[0088] As described above, in the light emitting device 100D_L of this embodiment, the first region R1′ where the optical coupling layer 80 is present and the second region R2′ where the optical coupling layer 80 is not present are arranged to define a predetermined pattern, so that light can be emitted so that the predetermined pattern is visible. Therefore, lighting (light emission) that is rich in design and entertainment value can be realized.

[0089] Furthermore, the light emitting device 100D_L of this embodiment has a light distribution control structure having multiple internal spaces IS (i.e., utilizing total internal reflection), and therefore can achieve high transparency (visible light transmittance). Furthermore, the sheet-like light emitting device 100D_L is suitable for use as an in-vehicle light emitting device.

[0090] The low refractive index region 80a (porous region 81) can be selectively formed in the first region R1′ by a coating method or a printing method. When using a coating method, coating can be performed using a mask having a predetermined pattern. As the printing method, a plate-based printing method such as gravure printing or a plateless printing method such as inkjet printing can be used.

[0091] Fifth Embodiment A light emitting device (illumination device) 100E_L according to this embodiment will be described with reference to Fig. 11. Fig. 11 is a cross-sectional view schematically showing the light emitting device 100E_L. The following description will focus on the differences between the light emitting device 100E_L according to this embodiment and the light emitting device 100D_L according to the fourth embodiment.

[0092] 11 , the light-guiding member 100E included in the light-emitting device 100E_L has a light distribution control structure having a plurality of internal spaces IS. The light distribution control structure having a plurality of internal spaces IS is formed in a direction changing layer 60C provided on the third main surface 10b side of the light-guiding layer 10. This direction changing layer 60C has the same configuration as the direction changing layer 60C of the light-emitting device 100D_L of the fourth embodiment.

[0093] The light guide member 100E further includes an optical coupling layer 80 provided between the light guide layer 10 and the direction changing layer 60C. The optical coupling layer 80 has a refractive index n ＧＰ A refractive index n smaller than Ｃ The plurality of low refractive index regions 80a are a plurality of porous regions 81 having a void structure therein.

[0094] The light emitting device 100E_L of this embodiment also has a first region R1′ where the optical coupling layer 80 is present and a second region R2′ where the optical coupling layer 80 is not present. The first region R1′ and the second region R2′ are arranged so as to define a predetermined pattern when viewed in a plan view from the normal direction to the first main surface.

[0095] In this embodiment, the first region R1′ and the second region R2′ are distinguished by whether or not the pore structure of the porous region 81 is filled with the adhesive layer 56 provided so as to contact the plurality of porous regions 81. As shown in Fig. 11 , the plurality of porous regions 81 include a plurality of first porous regions 81A located in the first region R1′ and whose pore structure is not filled with the adhesive layer 56, and a plurality of second porous regions 81B located in the second region R2′ and whose pore structure is substantially filled with the adhesive layer 56.

[0096] The region where the second porous region 81B, whose void structure is substantially filled with the adhesive layer 56, is located does not function as the optical coupling layer 80. In other words, the plurality of low refractive index regions 80a are defined by the plurality of first porous regions 81A, whose void structure is not filled with the adhesive layer 56.

[0097] The adhesive layer 56 may be any of the adhesives exemplified as suitable for forming the adhesive layer 52. To ensure that the adhesive layer 56 does not fill the void structure of the first porous region 81A of the plurality of porous regions 81 but substantially fills the void structure of the second porous region 81B, for example, a mask having a mask pattern (openings corresponding to the first region R1′) corresponding to the arrangement of the first region R1′ and the second region R2′ may be used when bonding the laminated structure including the plurality of porous regions 81 and the base layer 31 to the light guide layer 10 via the adhesive layer 56 using a laminator. The bonding conditions (such as the nip pressure of the laminator) may be appropriately set depending on the specifications of the adhesive used, the material of the porous region 81, and the like.

[0098] The void structure of the second porous region 81B does not necessarily need to be completely filled with the adhesive layer 56, but may be substantially filled to the extent that it does not function as an optical coupling layer 80. Even if the void structure of the second porous region 81B is completely filled with the adhesive layer 56, the refractive index of the second porous region 81B may not completely match the refractive index of the adhesive layer 56. The difference between the refractive index of the second porous region 81B and the refractive index of the adhesive layer 56 is preferably 0.3 or less, and more preferably 0.2 or less.

[0099] Like light emitting device 100D_L of Embodiment 4, light emitting device 100E_L of this embodiment can emit light in a predetermined pattern and can also achieve high transparency (visible light transmittance).

[0100] In the above example, the void structure of the second porous region 81B is filled with the adhesive layer 56. However, the second porous region 81B may be substantially filled with some material other than the adhesive layer 56 so as not to function as the optical coupling layer 80. In this case, the void structure of some of the porous regions 81 (the porous regions 81 that become the second porous regions 81B) among the plurality of porous regions 81 may be selectively filled with some material, and then the laminated structure including the plurality of porous regions 81 and the base layer 31 may be laminated with the light guide layer 10 by, for example, bonding the laminated structure and the light guide layer 10 together via the adhesive layer 56. The material that fills the void structure of the second porous region 81B is preferably a material such that the difference in refractive index between the second porous region 81B and the adhesive layer 56 is 0.3 or less, and more preferably 0.2 or less.

[0101] Sixth Embodiment A light emitting device (illumination device) 100F_L according to the sixth embodiment will be described with reference to Fig. 12. Fig. 12 is a cross-sectional view schematically illustrating the light emitting device 100F_L. The following description will focus on the differences between the light emitting device 100F_L according to the sixth embodiment and the light emitting device 100A_L according to the first embodiment.

[0102] 12 , light-guiding member 100F included in light-emitting device 100F_L differs from light-guiding member 100A of light-emitting device 100A_L in that light-guiding layer 10W and base layer 30W are configured so that their thicknesses increase with increasing distance from light-receiving side surface 10a (i.e., from light source LS). That is, light-guiding layer 10W and base layer 30W of light-guiding member 100F are each formed in a wedge shape.

[0103] In light guide layer 10W configured so that the thickness increases with increasing distance from light-receiving side surface 10a, compared to light guide layer 10 configured so that the thickness is constant, the angle formed between light propagating in the Y direction within light guide layer 10W and fourth major surface 10c and fourth major surface 10c is smaller (i.e., the angle of incidence on fourth major surface 10c is larger), and therefore less light (stray light) leaks from fourth major surface 10c. As a result, the directivity to one side is improved.

[0104] Furthermore, in the base layer 30W configured so that its thickness increases with increasing distance from the light source LS, stray light is reduced for the same reason, improving the directivity to one surface. The wedge-shaped base layer 30W may have a thickness approximately the same as that of the wedge-shaped light guide layer 10W.

[0105] Note that the light emitting device 100A_L of the first embodiment may be modified in the same manner as the modified example described with reference to Fig. 6. That is, as shown in Fig. 13, a light distribution control structure may be formed in a direction converting layer 60A' provided on the fourth main surface 10c side of the light guide layer 10W.

[0106] 7 , in addition to the light source LS that emits light toward the light-receiving side surface 10a of the light guide layer 10W, an additional light source that emits light toward an end face of the base layer 30W (an end face located on the same side as the light-receiving side surface 10a of the light guide layer 10W) ​​may be provided. In this case, the base layer 30W can be said to function as an additional light guide layer.

[0107] Furthermore, one of the light guide layer 10W and the base layer 30W may be replaced with a non-wedge-shaped one.

[0108] Furthermore, instead of the light guide layer 10 and / or the base layer 30 of the light emitting devices 100B_L, 100C_L, 100D_L, and 100E_L of the second to fifth embodiments, a wedge-shaped light guide layer 10W and / or a base layer 30W may be used.

[0109] [Other Examples of Light Distribution Control Structure] In the explanations given so far, a configuration has been illustrated in which a light distribution control structure having a plurality of internal spaces IS is formed in a direction conversion layer provided on one side of the two main surfaces of a light guide layer, but a light distribution control structure having a plurality of internal spaces IS may also be formed in the light guide layer. Such a light guide layer is produced, for example, by bonding a first film having no pattern formed thereon and a second film having a desired fine pattern formed thereon by a lamination method or by bonding them together with an adhesive (including a pressure-sensitive adhesive).

[0110] The second film can be micropatterned using laser patterning, direct laser imaging, laser drilling, masked or maskless laser or electron beam irradiation, or by printing, inkjet printing, screen printing, etc. Individual properties can be imparted to the second film to modify the material or refractive index value. Micro / nano-dispensing, dosing, direct "writing," discrete laser sintering, micro-electrical discharge machining (micro-EDM), or micromachining, micro-molding, imprinting, embossing, and the like can also be used.

[0111] [Anti-Reflection Layer, Anti-Glare Layer, and Hard Coat Layer] The light-emitting devices according to the embodiments of the present invention are not limited to the above-described examples and may be modified in various ways. For example, instead of the base layer 30 of the light-emitting device 100A_L, an anti-reflection layer, an anti-glare layer, and / or a hard coat layer (e.g., having a pencil hardness of H or higher) may be provided. Of course, an anti-reflection layer, an anti-glare layer, and / or a hard coat layer may be provided on the base layer 30. Furthermore, an anti-reflection layer, an anti-glare layer, and / or a hard coat layer may be provided on the side of the light-guiding layer 10 opposite the base layer 30. The anti-reflection layer, the anti-glare layer, and the hard coat layer may be formed using known materials and by known methods.

[0112] [Application to Building Components] The above-described sheet-like transparent light-emitting device is used as a building component. The light-emitting device itself can be used as a building component, or it can be used as a part of a building component. Building components include exterior and interior components. For example, they can be used as window components, wall components, partitions, ceiling (skylight) components, staircase components, handrail components, and floor components. In addition, they can also be used as light-emitting devices (lighting devices) for streets, crime prevention, emergencies, gardens, pools and ponds (underwater), inside warehouses, inside factories, and under eaves (outdoors). In all cases, they are used as transparent plates when not in use.

[0113] According to an embodiment of the present invention, it is possible to provide a light emitting device that can emit light in a predetermined pattern and has sufficiently high transparency, and a light guiding member for a light emitting device that is suitable for use in such a light emitting device. The light emitting device according to the embodiment of the present invention is suitable for use in a vehicle.

[0114] 10, 10W Light guide layer 30, 30W, 31 Base layer 52, 54, 56 Adhesive layer 60A, 60A', 60B, 60C Direction conversion layer 62A, 62B Shaped film 64 Recess 64A First recess 64B Second recess 80 Optical coupling layer 80a Low refractive index region 81 Porous region 81A First porous region 81B Second porous region 100A, 100B, 100C, 100D, 100E, 100F Light guide member 100A_L, 100B_L, 100C_L Light emitting device 100D_L, 100E_L, 100F_L Light emitting device IS Internal space ISa First inclined surface ISb Second inclined surface LS Light source R1, R1' First region R2, R2' second region

Claims

1. A light guide member for a light emitting device having a first main surface and a second main surface opposite to the first main surface, a light receiving portion that receives light emitted from a light source, a light guide layer having a third main surface on the first main surface side and a fourth main surface on the second main surface side, a light distribution control structure having a plurality of internal spaces, wherein the plurality of internal spaces form an interface that directs a part of the light propagating in the light guide layer toward the first main surface side by total internal reflection, and the light distribution control structure, and when viewed in plan from the normal direction to the first main surface, the first region where the light distribution control structure is present and the second region where the light distribution control structure is not present are arranged so as to define a predetermined pattern, a light guide member for a light emitting device.

2. having a shaping film having a fifth main surface having a plurality of recesses, the plurality of recesses include a plurality of first recesses located in the first region, the plurality of first recesses being unfilled, and a plurality of second recesses located in the second region, the plurality of second recesses being substantially filled, the plurality of internal spaces are defined by the plurality of first recesses of the shaping film, the light guide member for a light emitting device according to claim 1.

3. having an adhesive layer disposed on the fifth main surface side of the shaping film, the plurality of first recesses are not filled by the adhesive layer, the plurality of second recesses are substantially filled by the adhesive layer, the plurality of internal spaces are defined by the plurality of first recesses of the shaping film and the adhesive layer, the light guide member for a light emitting device according to claim 2.

4. having a shaping film having a fifth main surface having a plurality of recesses, the plurality of recesses are formed only in the first region of the first region and the second region, the plurality of internal spaces are defined by the plurality of recesses of the shaping film, the light guide member for a light emitting device according to claim 1.

5. having an adhesive layer disposed on the fifth main surface side of the shaping film, the plurality of internal spaces are defined by the plurality of recesses of the shaping film and the adhesive layer, the light guide member for a light emitting device according to claim 4.

6. the plurality of internal spaces are formed in a direction conversion layer provided on the third main surface side or the fourth main surface side of the light guide layer, the light guide member for a light emitting device according to any one of claims 1 to 5.

7. further having a light coupling layer provided between the light guide layer and the direction conversion layer, The light coupling layer has a plurality of low refractive index regions having a refractive index smaller than that of the light guide layer, the light guide member for a light emitting device according to claim 6.

8. A light guide member for a light emitting device having a first main surface and a second main surface opposite to the first main surface, A light receiving portion that receives light emitted from a light source, a light guide layer having a third main surface on the first main surface side and a fourth main surface on the second main surface side, A light distribution control structure having a plurality of internal spaces, wherein the plurality of internal spaces form an interface that directs a part of the light propagating in the light guide layer toward the first main surface side by total internal reflection, the light distribution control structure, It has, The plurality of internal spaces are formed in a direction conversion layer provided on the third main surface side or the fourth main surface side of the light guide layer, The light guide member for a light emitting device, A light coupling layer provided between the light guide layer and the direction conversion layer, further having a light coupling layer having a plurality of low refractive index regions having a refractive index smaller than that of the light guide layer, When viewed in a plan view from the normal direction with respect to the first main surface, the first region where the light coupling layer exists and the second region where the light coupling layer does not exist are arranged so as to define a predetermined pattern, the light guide member for a light emitting device.

9. Provided between the light guide layer and the direction conversion layer, having a plurality of porous regions having a void structure inside, The plurality of porous regions are formed only in the first region of the first region and the second region, The plurality of low refractive index regions are defined by the plurality of porous regions, the light guide member for a light emitting device according to claim 8.

10. Provided between the light guide layer and the direction conversion layer, having a plurality of porous regions having a void structure inside, The plurality of porous regions include a plurality of first porous regions located in the first region and having the void structure not filled, and a plurality of second porous regions located in the second region and having the void structure substantially filled, The plurality of low refractive index regions are defined by the plurality of first porous regions, the light guide member for a light emitting device according to claim 8.

11. It has an adhesive layer provided so as to be in contact with the plurality of porous regions, The void structure of the plurality of first porous regions is not filled by the adhesive layer, The void structure of the plurality of second porous regions is substantially filled by the adhesive layer, the light guide member for a light emitting device according to claim 10.

12. The light guide layer is configured to increase in thickness as it moves away from the light receiving portion. The light guide member for a light emitting device according to any one of claims 1 to 5 and 8 to 11.

13. A light guide member for a light emitting device according to any one of claims 1 to 5 and 8 to 11, a light source that emits light toward the light receiving portion, and a light emitting device comprising the same.