Light guide member for light-emitting device and light-emitting device
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- NITTO DENKO CORP
- Filing Date
- 2022-06-16
- Publication Date
- 2026-05-26
Smart Images
Figure 0007865964000001 
Figure 0007865964000002 
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Abstract
Description
[Technical Field]
[0001] The present invention relates to a light guide member for a light-emitting device and a light-emitting device, and more particularly to a sheet-shaped light guide member for a light-emitting device and a light-emitting device. [Background technology]
[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 can also be called "light-emitting devices") widely utilize a configuration that includes 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 switched off and emits light in the shape of letters or pictures when switched on. As a method for realizing such a light-emitting device, a technique is known in which a structure for extracting light (for example, a micro-prism or dot-shaped pattern) is formed only on a part of the light guide plate using methods such as laser engraving or inkjet. Patent document 1 discloses a light-point type display device in which a group of reflective dots is formed on a light guide plate in the shape of letters or figures, as such a light-emitting device. [Prior art documents] [Patent Documents]
[0004] [Patent Document 1] Japanese Patent Publication No. 2004-069729 [Overview of the Initiative] [Problems that the invention aims to solve]
[0005] However, in conventional light-emitting devices, there is a trade-off between the amount of light emitted from the light guide plate and the transparency of the light guide plate when designing the pattern density of the structure for extracting light. It is difficult to achieve high transparency while ensuring sufficient light output.
[0006] Furthermore, when using the aforementioned light-emitting devices for automotive applications, one might consider using window glass as a light guide plate. However, 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. Moreover, because windshields and rear windows have curved shapes, processing large areas is difficult due to equipment limitations.
[0007] The embodiment of the present invention aims to provide a light-emitting device that can emit light in a predetermined pattern and that can achieve sufficiently high transparency, and a light guide member for such a light-emitting device that is suitably used in such a device. [Means for solving the problem]
[0008] According to embodiments of the present invention, the following solutions are provided.
[0009] [Item 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 section that receives light emitted from a light source, and a light-guiding 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 multiple internal spaces, wherein the multiple internal spaces form interfaces that direct a portion of the light propagating within the light guide layer toward the first main surface side by total internal reflection, It has, A light guide member for a light-emitting device, wherein, when viewed from a plane direction normal to the first main surface, the first region where the light distribution control structure exists and the second region where the light distribution control structure does not exist are arranged to define a predetermined pattern.
[0010] [Item 2] The shaping film has a fifth main surface having multiple recesses, The plurality of recesses include a plurality of first recesses located within the first region that are not filled, and a plurality of second recesses located within the second region that are substantially filled. The plurality of internal spaces are defined by the plurality of first recesses of the shaped film, and the light guide member for a light-emitting device according to Item 1.
[0011] [Item 3] It has an adhesive layer disposed on the fifth major surface side of the shaped 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 shaped film and the adhesive layer, and the light guide member for a light-emitting device according to Item 2.
[0012] [Item 4] It has a shaped film having a fifth major surface with 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 shaped film, and the light guide member for a light-emitting device according to Item 1.
[0013] [Item 5] It has an adhesive layer disposed on the fifth major surface side of the shaped film, The plurality of internal spaces are defined by the plurality of recesses of the shaped film and the adhesive layer, and the light guide member for a light-emitting device according to Item 4.
[0014] [Item 6] The plurality of internal spaces are formed in a direction conversion layer provided on the third major surface side or the fourth major surface side of the light guide layer, and the light guide member for a light-emitting device according to any one of Items 1 to 5.
[0015] [Item 7] It further has an optical coupling layer provided between the light guide layer and the direction conversion layer, The optical coupling layer has a plurality of low refractive index regions having a refractive index smaller than the refractive index of the light guide layer, and the light guide member for a light-emitting device according to Item 6.
[0016] [Item 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, having, 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, and 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, a light guide member for a light emitting device, wherein when viewed in a plan view from the normal direction to the first main surface, a first region where the light coupling layer exists and a second region where the light coupling layer does not exist are arranged so as to define a predetermined pattern.
[0017] [Item 9] provided between the light guide layer and the direction conversion layer, and 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 Item 8.
[0018] [Item 10] provided between the light guide layer and the direction conversion layer, and 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 light guide member for a light-emitting device according to item 8, wherein the plurality of low refractive index regions are defined by the plurality of first porous regions.
[0019] [Item 11] The adhesive layer is 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 light guide member for a light-emitting device according to item 10, wherein the void structure of the plurality of second porous regions is substantially filled by the adhesive layer.
[0020] [Item 12] The light guide layer is configured such that its thickness increases as it moves away from the light receiving portion, as described in any of items 1 to 11, for a light-emitting device light guide member.
[0021] [Item 13] A light guide member for a light-emitting device as described in any of items 1 to 12, A light source that emits light toward the light receiving unit, A light-emitting device equipped with the following features. [Effects of the Invention]
[0022] According to embodiments of the present invention, it is possible to provide a light-emitting device that can emit light in a predetermined pattern and that can achieve sufficiently high transparency, as well as a light-guiding member for such a light-emitting device that is suitably used in such a device. [Brief explanation of the drawing]
[0023] [Figure 1] This is a schematic cross-sectional view showing a light-emitting device 100A_L according to an embodiment of the present invention. [Figure 2] This is a plan view showing an example of the first region R1 and the second region R2 of the light-emitting device 100A_L. [Figure 3] This is a schematic plan view of the light-emitting device 100A_L. [Figure 4]This is a schematic cross-sectional view showing the internal space IS of the light distribution control structure of the light-emitting device 100A_L. [Figure 5] This is a schematic plan view showing the internal space IS. [Figure 6] This is a schematic cross-sectional view of the light-emitting device 100A_L. [Figure 7] This is a schematic cross-sectional view of the light-emitting device 100A_L. [Figure 8] This is a schematic cross-sectional view showing a light-emitting device 100B_L according to an embodiment of the present invention. [Figure 9] This is a schematic cross-sectional view showing a light-emitting device 100C_L according to an embodiment of the present invention. [Figure 10] This is a schematic cross-sectional view showing a light-emitting device 100D_L according to an embodiment of the present invention. [Figure 11] This is a schematic cross-sectional view showing a light-emitting device 100E_L according to an embodiment of the present invention. [Figure 12] This is a schematic cross-sectional view showing a light-emitting device 100F_L according to an embodiment of the present invention. [Figure 13] This is a schematic cross-sectional view of the light-emitting device 100F_L. [Modes for carrying out the invention]
[0024] The light guide member and light-emitting device according to embodiments of the present invention will be described below with reference to the drawings. However, the light guide member and light-emitting device according to embodiments of the present invention are not limited to those exemplified in the following description.
[0025] (Embodiment 1) [Configuration of light guide members for light-emitting devices and light-emitting devices] The light-emitting device (illumination device) 100A_L in this embodiment will be described with reference to Figure 1. Figure 1 is a schematic cross-sectional view showing the light-emitting device 100A_L.
[0026] As shown in Figure 1, the light-emitting device 100A_L comprises a light source LS and a light guide member 100A.
[0027] The light source LS is, for example, an LED device. Multiple LED devices may be used as the light source LS. The multiple LED devices are arranged, for example, in the X direction.
[0028] The light guide member 100A is in the form of a sheet, having a first main surface and a second main surface opposite to the first main surface. In Figure 1, the lower main surface is the first main surface, and the upper main surface is the second main surface. Here, "sheet-like" includes plate-like and film-like forms, and does not specify the rigidity (flexibility) or thickness of the sheet. The sheet-like light guide member can be used in various forms, such as roll-like.
[0029] The light guide member 100A receives light emitted from the light source LS, propagates the light in the Y direction, and emits light in the -Z direction. Therefore, the first main surface of the light guide member 100A functions as the light emission surface. Of course, the direction of light propagation has variation (distribution) from the Y direction, and the direction of light emission also has variation (distribution) from the -Z direction. A coupling optical system may be provided between the light guide member 100A and the light source LS to efficiently guide the light emitted from the light source LS to the light guide member 100A.
[0030] The light guide member 100A includes a light guide 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 to the light-emitting surface side). In the illustrated example, 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 on the light source LS side. Also, in the illustrated example, the light guide layer 10 is located on the outermost surface of the second main surface side of the light guide member 100A, so the fourth main surface 10c of the light guide layer 10 is the second main surface of the light guide member 100A.
[0032] The multiple 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 main 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 main surface by total internal reflection, and a second inclined surface ISb on the opposite side of the first inclined surface ISa.
[0033] In the illustrated light guide member 100A, the light distribution control structure having multiple internal spaces IS is formed in the direction conversion layer 60A provided on the third main surface 10b side of the light guide layer 10. The direction conversion layer 60A consists of a shaping film 62A having a fifth main surface 62a with multiple recesses 64, and an adhesive layer 52 disposed on the fifth main surface 62a side of the shaping film 62A. The adhesive layer 52 is located between the shaping film 62A and the light guide layer 10, and the light guide layer 10 and the shaping film 62A are bonded together by the adhesive layer 52.
[0034] In the illustrated example, the adhesive layer 54 and the base layer 30 are arranged in this order on the first main surface side of the direction change layer 60A, and the shaping film 62A and the base layer 30 are bonded 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, base layer 30, shaping film 62A, and adhesive layers 52 and 54 will be described later.
[0035] The light-emitting device 100A_L has a region R1 in which a light distribution control structure exists (hereinafter referred to as the "first region") and a region R2 in which a light distribution control structure does not exist (hereinafter referred to as the "second region"). The first region R1 and the second region R2 are arranged to define a predetermined pattern when viewed from a plane in the direction normal to the first main surface. Here, the "pattern" includes letters, numbers, symbols, pictures, designs, and combinations thereof.
[0036] Figure 2 shows an example of the arrangement of the first region R1 and the second region R2. Figure 2 shows the state in which the light-emitting device 100A_L is lit.
[0037] As shown in Figure 2, the first region R1, where the light distribution control structure exists, is the region that emits light when the light is on (light-emitting region), and the second region R2, where the light distribution control structure does not exist, is the region that does not emit light substantially when the light is on (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 Figure 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 shaping film 62A are filled with adhesive layer 52. As shown in Figure 1, the plurality of recesses 64 of the shaping film 62A include a plurality of first recesses 64A located within the first region R1 and not filled with adhesive layer 52, and a plurality of second recesses 64B located within the second region R2 and substantially filled with adhesive layer 52.
[0039] Multiple internal spaces IS are defined by multiple first recesses 64A of the shaping film 62A and the adhesive layer 52. In other words, the region where the first recesses 64A that are not filled by the adhesive layer 52 are located becomes the first region R1 where the light distribution control structure exists. In contrast, the region where the second recesses 64B that are substantially filled by the adhesive layer 52 are located becomes the second region R2 where the light distribution control structure does not function (i.e., there is no light distribution control structure).
[0040] The light distribution of light emanating from the first region R1 can be controlled by adjusting the cross-sectional shape, size, arrangement density, and distribution of the internal spaces IS. The internal spaces IS are typically air cavities 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. All disclosures of International Publication No. 2019 / 087118 are incorporated herein by reference.
[0041] Furthermore, the visible light transmittance and haze value of the light guide 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 guide member 100A is, for example, 60% or more, preferably 80% or more. The haze value of the light guide member 100A is, for example, less than 30%, preferably less than 10%. Here, visible light is defined as light with a wavelength of 380 nm to 780 nm. The visible light transmittance and haze value can be measured, for example, using a haze meter (manufactured by Murakami Color Technology Laboratory: product name HM-150). From the viewpoint of viewing an object (display) through the light-emitting device 100A_L (light guide member 100A), it is preferable that the visible light transmittance of the light guide member 100A is 60% or more, and that the haze value of the light guide member 100A is less than 30%.
[0042] When the light guide member 100A is viewed from the normal direction of the first main surface, the ratio of the area of the multiple internal spaces IS to the area of the first region R1 (occupancy rate) is preferably 1% or more and 80% or less, and more preferably 1% or more and 50% or less. From the viewpoint of obtaining a low haze value, the occupancy rate of the internal spaces IS is preferably 30% or less, and more preferably 10% or less.
[0043] The shape and arrangement of the internal space IS will be explained with reference to Figures 3, 4, and 5. Figure 3 is a schematic plan view of the light-emitting device 100A_L. Figure 4 is a schematic cross-sectional view of the internal space IS, and Figure 5 is a schematic plan view of the internal space IS.
[0044] As shown in Figure 3, the multiple internal spaces IS can be discretely arranged, for example, in the light-guiding direction (Y direction) of the light-guiding layer 10 and in directions intersecting the light-guiding direction. The discrete arrangement may or may not have periodicity (regularity) in at least one direction. However, from the viewpoint of mass production, it is preferable that the multiple internal spaces IS are uniformly arranged in the first region R1. For example, in the example shown in Figure 3, multiple internal spaces IS having substantially the same shape and a curved surface convex in the same direction are discretely and periodically arranged in the light-guiding direction (Y direction) of the light-guiding plate 10 and in a direction perpendicular to the light-guiding 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 Figure 3, further internal spaces IS are provided that are offset by half a pitch in each of the Y and X directions.
[0045] As shown in Figure 3, when viewed from a plane from the direction normal to the first main surface of the light guide member 100A, the first inclined surface ISa forms a curved surface that is convex toward the light source LS. When multiple LED devices arranged in the X direction are used as the light source LS, the light emitted from each LED device has a spread in the Y direction, so having a curved surface that is convex toward the light source LS allows the first inclined surface ISa to act uniformly on the light. However, if a coupled optical system is provided between the light source LS and the light-receiving side surface 10a of the light guide layer 10, and light with high parallelism (light with small spread in the Y direction) is incident, the first inclined surface ISa may be parallel to the X direction. Also, instead of a discrete internal space IS, there may be an internal space such as a groove (e.g., a triangular prism) extending in the X direction.
[0046] As shown in Figure 4, the cross-sectional shape of the internal space IS (the shape of the cross section perpendicular to the X direction and parallel to the YZ plane in Figure 1) is, for example, a triangle with its apex angle on the first main surface side of the light guide member 100A (the -Z direction in Figure 1). 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 light distribution decreases, and the light extraction efficiency may also decrease. On the other hand, if the inclination angle θa exceeds 70°, for example, processing the shaping film may become difficult. 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 be generated in unintended directions. On the other hand, if the inclination angle θb exceeds 100°, for example, processing the shaping 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 also be a trapezoid or the like.
[0047] As shown in Figure 5, the two-dimensional size of the internal space IS is defined 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, twice or more the width W of the internal space IS. Furthermore, the height H of the internal space IS (see Figure 4) is preferably, for example, 1 μm or more and 100 μm or less from the viewpoint of light extraction efficiency.
[0048] As described above, in the light-emitting device 100A_L of this embodiment, the first region R1 in which a light distribution control structure exists and the second region R2 in which a light distribution control structure does not exist are arranged to define a predetermined pattern, thereby enabling the emission of light in a predetermined pattern. Therefore, lighting (light emission) that is rich in design and entertainment value can be realized.
[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 internal total internal reflection), so it can achieve high transparency (visible light transmittance). The light guide 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-shaped light-emitting device 100A_L can be attached to the window glass of an automobile, making it suitable for use as an in-vehicle light-emitting device. Furthermore, since the light-emitting device 100A_L having the above-described configuration may be flexible, it can also be attached to curved glass. Therefore, the light-emitting device 100A_L can be placed on large-area curved glass such as the windshield or rear window. The window glass may also be used as part of the light-emitting device 100A_L (light guide layer 10 or base material layer 30). In addition, the light-emitting device 100A_L is not limited to in-vehicle applications and can also be used in shop windows, etc.
[0051] As will be described later, a light distribution control structure having multiple internal spaces IS may be formed in the light guide layer 10. However, as in this embodiment, forming a light distribution control structure having multiple internal spaces IS in the direction conversion layer 60A makes it easier 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 guide layer 10, for example, as described later, it is conceivable to form a fine pattern (recess) defining the internal space IS on the film by laser processing. However, in that 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) will be reflected in various directions by the irregular interface, which may reduce transparency in the off state. In addition, the directivity in the on state may decrease, potentially reducing light utilization efficiency. Furthermore, even if a suitable anisotropic shape can be formed, alteration may occur in the area around the recess due to energy unevenness of the laser light. Since the refractive index changes in the altered area, scattering due to the difference in refractive index may occur. Therefore, transparency and directivity may be adversely affected. In addition, reliability may decrease. In contrast, by forming a light distribution control structure having multiple internal spaces IS in the direction conversion layer 60A, it is easier 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, substrate layer, shaping film, and adhesive layer] The light guide layer 10 can be formed from a known material with high transmittance to visible light. For example, the light guide layer 10 can be formed from an acrylic resin such as polymethyl methacrylate (PMMA), a polycarbonate (PC) resin, a cycloolefin resin, or glass (e.g., quartz glass, alkali-free glass, borosilicate glass). The refractive index n of the light guide layer 10... GP For example, it is between 1.40 and 1.80. Unless otherwise specified, the refractive index refers to the 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. For example, the thickness of the light guide layer 10 is between 0.05 mm and 50 mm.
[0054] The thickness of the base layer 30 is, for example, 1 μm or more and 1000 μm or less, preferably 10 μm or more and 100 μm or less, and more preferably 20 μm or more and 80 μm or less. The refractive index of the base layer 30 is preferably 1.40 or more and 1.70 or less, and more preferably 1.43 or more and 1.65 or less.
[0055] The shaping film 62A for forming the internal space IS can be manufactured, for example, by the method described in Japanese Patent Publication No. 2013-524288. Specifically, for example, the shaping film 62A can be manufactured by coating the surface of a polymethyl methacrylate (PMMA) film with lacquer (for example, FineCure RM-64 manufactured by Sanyo Chemical Industries, Ltd.), embossing an optical pattern onto the film surface containing the lacquer, and then curing the lacquer.
[0056] The thickness of the adhesive layers 52 and 54 is, independently of each other, for example, 0.1 μm to 100 μm, preferably 0.3 μm to 100 μm, and more preferably 0.5 μm to 50 μm. The refractive index of the adhesive layers 52 and 54 is, independently of each other, preferably 1.42 to 1.60, and more preferably 1.47 to 1.58. Furthermore, the refractive index of the adhesive layers 52 and 54 is preferably close to the refractive index of the light guide layer 10, substrate layer 30, or shaping film 62A with which it is in 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 tacks). 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 individually or in combination of two or more types.
[0058] Preferably, the adhesive layer 52 can adhere without filling the first recess 64A on the surface of the shaping film 62A. Suitable adhesives for forming the adhesive layer 52 include those described in the present applicant's International Publication No. 2021 / 167090, International Publication No. 2021 / 167091, or International Application PCT / JP2022 / 004554. All disclosures of these applications are incorporated herein by reference. In particular, the polyester-based adhesive described in International Application PCT / JP2022 / 004554 is preferred.
[0059] For the adhesive layer 52 to substantially fill the second recess 64B of the multiple recesses 64 of the shaping film 62A without filling the first recess 64A, for example, when laminating the light guide layer 10 and the shaping film 62A via the adhesive layer 52 using a laminating machine, a mask having a mask pattern corresponding to the arrangement of the first region R1 and the second region R2 (with an opening corresponding to the first region R1) can be used. Various conditions during lamination (such as the nip pressure of the laminating machine) can be appropriately set according to the specifications of the adhesive used and the size of the recesses 64.
[0060] Furthermore, the second recess 64B of the shaping film 62A does not necessarily need to be completely filled by the adhesive layer 52; it is sufficient if it is substantially filled to the extent that it does not function as a light distribution control structure.
[0061] [Other examples of the second recess] In the example described above, a configuration was described in which the second recess 64B of the shaping film 62A is filled with an adhesive layer 52 for bonding the light guide layer 10 and the shaping film 62A. However, the second recess 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 recess 64B is preferably close to that of the shaping 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 of the plurality of recesses 64 of the shaping film 62A (the recesses 64 that become the second recess 64B) with some material (e.g., adhesive), the light guide layer 10 and the shaping film 62A can be laminated by bonding the light guide layer 10 and the shaping film 62A together, for example via the adhesive layer 52, to obtain a configuration in which the first recess 64A and the second recess 64B are mixed.
[0062] [Other examples of direction change layers] Figure 1 shows an example in which a light distribution control structure is formed on a direction changing layer 60A provided on the third main surface 10b side of the light guide layer 10. However, as shown in Figure 6, a light distribution control structure may also be formed on a direction changing layer 60A' provided on the fourth main surface 10c side of the light guide layer 10. The direction changing layer 60A' is composed of a shaping film 62A having a fifth main surface 62a with a plurality of recesses 64, and an adhesive layer 52 disposed on the fifth main surface 62a side of the shaping film 62A. A base layer 30 is disposed on the side of the adhesive layer 52 opposite to the shaping film 62A, and the shaping film 62A and the base layer 30 are bonded together by the adhesive layer 52. In addition, the light guide layer 10 and the shaping film 62A are bonded together by an adhesive layer 54 disposed on the fourth main surface 10c side of the light guide layer 10. In the example shown in Figure 6, the light guide layer 10 is located on the outermost surface of the first main surface side of the light guide member 100A, so the third main surface 10b of the light guide layer 10 is the first main surface of the light guide member 100A.
[0063] [Other examples of light source placement] As shown in Figure 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' may be provided that emits light toward the end face of the substrate layer 30 (the end face located on the same side as the light-receiving side surface 10a of the light guide layer 10). In this case, the substrate layer 30 can be said to function as an additional light guide layer.
[0064] (Embodiment 2) The light-emitting device 100B_L in this embodiment will be described with reference to Figure 8. Figure 8 is a schematic cross-sectional view showing the light-emitting device 100B_L. Below, the explanation will focus on the differences between the light-emitting device 100B_L in this embodiment and the light-emitting device 100A_L in Embodiment 1.
[0065] As shown in Figure 8, the light guide member 100B of the light-emitting device 100B_L has a light distribution control structure having a plurality of internal spaces IS, similar to the light guide member 100A of the light-emitting device 100A_L. The light distribution control structure having a plurality of internal spaces IS is formed in the direction conversion layer 60B provided on the third main surface 10b side of the light guide layer 10. The direction conversion layer 60B consists of a shaping film 62B having a fifth main surface 62a having a plurality of recesses 64, and an adhesive layer 52 disposed on the fifth main surface 62a side of the shaping film 62B.
[0066] The light-emitting device 100B_L has a first region R1 in which a light distribution control structure exists, and a second region R2 in which the light distribution control structure does not exist. The first region R1 and the second region R2 are arranged to define a predetermined pattern when viewed from a plan view from the direction normal to the first main surface.
[0067] In this embodiment, the first region R1 and the second region R2 are distinguished by whether or not recesses 64 are formed in the shaping film 62B. As shown in Figure 8, the multiple recesses 64 of the shaping film 62B are formed only in the first region R1 (i.e., selectively in the first region R1) of the two regions R2.
[0068] Multiple internal spaces IS are defined by multiple recesses 64 of the shaping film 62B and the adhesive layer 52. Therefore, the region where the recesses 64 exist becomes the first region R1 where the light distribution control structure exists. In contrast, the region where the recesses 64 do not exist becomes the second region R2 where the light distribution control structure does not function (i.e., the light distribution control structure does not exist).
[0069] The light-emitting device 100B_L of this embodiment, like the light-emitting device 100A_L of Embodiment 1, can emit light in a predetermined pattern and can also achieve high transparency (visible light transmittance).
[0070] (Embodiment 3) The light-emitting device 100C_L in this embodiment will be described with reference to Figure 9. Figure 9 is a schematic cross-sectional view showing the light-emitting device 100C_L. Below, the explanation will focus on the differences between the light-emitting device 100C_L in this embodiment and the light-emitting device 100A_L in Embodiment 1.
[0071] As shown in Figure 9, the light guide member 100C of the light-emitting device 100C_L has a light distribution control structure having multiple internal spaces IS, similar to the light guide member 100A of the light-emitting device 100A_L. The light distribution control structure having multiple internal spaces IS is formed in the direction conversion layer 60A provided on the third main surface 10b side of the light guide layer 10. This direction conversion layer 60A has the same configuration as the direction conversion layer 60A of the light-emitting device 100A_L of Embodiment 1.
[0072] The light guide member 100C further includes an optical coupling layer 80 provided between the light guide layer 10 and the direction conversion layer 60A. The optical coupling layer 80 has a refractive index n of the light guide layer 10. GP A refractive index n smaller than C It has multiple low refractive index regions 80a. Each low refractive index region 80a is formed in the shape of a dot, for example, with a size of 1 μm to 1000 μm.
[0073] The optical coupling layer 80, which has multiple low refractive index regions 80a, is supported by the substrate layer 31, and the light guide layer 10 and the substrate layer 31 are bonded together by an adhesive layer 56. In addition, the substrate layer 31 and the shaping 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, a photo-coupling layer 80 having multiple low-refractive-index regions 80a is provided, which allows light propagating through the light guide layer 10 to be guided to the direction conversion layer 60A more selectively and efficiently. Furthermore, by adjusting the arrangement density of the multiple low-refractive-index regions 80a, the uniformity of the light emitted from the first region R1 can be controlled. For example, by arranging the low-refractive-index regions 80a to be denser on the light source LS side and sparser as they move away from the light source LS, the uniformity of the light can be improved.
[0075] [Examples of preferred configurations for the photocoupling layer (low refractive index region)] Refractive index n in the low refractive index region 80a C The refractive index n of the light guide layer 10 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 in the low refractive index region 80a C The difference between the two values is preferably 0.20 or more, more preferably 0.23 or more, and even more preferably 0.25 or more. Refractive index n C The low refractive index region 80a with a refractive index of 1.30 or less may be, for example, a porous region having an internal void structure. The thickness of the low refractive index region 80a is, for example, 0.3 μm or more and 5 μm or less.
[0076] If the low refractive index region 80a is a porous region, its porosity is preferably 35 volume% or more, more preferably 38 volume% or more, and particularly preferably 40 volume% 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 volume% or less, and preferably 75 volume% 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. All of the disclosures in International Publication No. 2019 / 146628 are incorporated herein by reference. Specifically, the low refractive index region 80a having a void structure may include substantially spherical particles such as silica particles, silica particles with micropores, silica hollow nanoparticles, fibrous particles such as cellulose nanofibers, alumina nanofibers, silica nanofibers, and plate-like particles such as nanoclay composed of bentonite. The low refractive index region 80a having a void structure may be a porous body in which particles (e.g., microporous particles) are directly chemically bonded to each other. Furthermore, at least some 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 or equal to the mass of the particles) of a binder component. The porosity and refractive index n of the low refractive index region 80a C This can be adjusted by the particle size, particle size distribution, etc., of the particles constituting the low refractive index region 80a.
[0078] Methods for obtaining a low refractive index region 80a having a void structure include, for example, the methods described in Japanese Patent Publication No. 2010-189212, Japanese Patent Publication No. 2008-040171, Japanese Patent Publication No. 2006-011175, International Publication No. 2004 / 113966, and their references. All disclosures of Japanese Patent Publication No. 2010-189212, Japanese Patent Publication No. 2008-040171, Japanese Patent Publication No. 2006-011175, and International Publication No. 2004 / 113966 are incorporated herein by reference.
[0079] As the low refractive index region 80a having a void structure, a silica porous body can be preferably used. The silica porous body can be produced, for example, by the following methods. A method of hydrolyzing and polycondensing a silicon compound; at least one of hydrolyzable silanes and / or silsesquioxanes, and their partial hydrolyzates and dehydration condensates, a method using porous particles and / or hollow fine particles, and a method of generating an aerogel layer using the springback phenomenon, a method of pulverizing a gel-like silicon compound obtained by the sol-gel method and using a pulverized gel in which fine pore particles, which are the obtained pulverized bodies, are chemically bonded to each other with a catalyst or the like, and the like can be mentioned. However, the low refractive index region 80a is not limited to the silica porous body, and the production method is not limited to the exemplified production methods, and it may be produced by any production method. Incidentally, silsesquioxane is a silicon compound having (RSiO 1.5 , R is a hydrocarbon group) as a basic structural unit, and is strictly different from silica having SiO2 as a basic structural unit, but is common to silica in that it has a network structure crosslinked by siloxane bonds. Therefore, here, a porous body containing silsesquioxane as a basic structural unit is also referred to as a silica porous body or a silica-based porous body.
[0080] The silica porous body can be composed of fine pore particles of a gel-like silicon compound bonded to each other. Examples of the fine pore particles of the gel-like silicon compound include a pulverized body of the gel-like silicon compound. The silica porous body can be formed, for example, by applying a coating liquid containing a pulverized body of a gel-like silicon compound to a substrate. The pulverized body of the gel-like silicon compound can be chemically bonded (for example, siloxane bond) by the action of a catalyst, light irradiation, heating, or the like.
[0081] (Embodiment 4) The light-emitting device 100D_L in the present embodiment will be described while referring to FIG. 10. FIG. 10 is a cross-sectional view schematically showing the light-emitting device 100D_L. Hereinafter, the description will be centered on the points in which the light-emitting device 100D_L in the present embodiment is different from the light-emitting device 100C_L in Embodiment 3.
[0082] As shown in Figure 10, the light guide member 100D of 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 the direction conversion layer 60C provided on the third main surface 10b side of the light guide layer 10. The direction conversion layer 60C is composed of a shaping film 62A having a fifth main surface 62a having a plurality of recesses 64, and an adhesive layer 52 disposed on the fifth main surface 62a side of the shaping film 62A.
[0083] The multiple recesses 64 of the shaping film 62A are formed over substantially the entire surface of the light guide member 100D in a plan view and are not filled by the adhesive layer 52. Therefore, the multiple internal spaces IS are provided over substantially the entire surface of the light guide member 100D in a plan view.
[0084] Furthermore, the light guide member 100D further includes an optical coupling layer 80 provided between the light guide layer 10 and the direction conversion layer 60C. The optical coupling layer 80 has a refractive index n of the light guide layer 10. GP A refractive index n smaller than C It has multiple low refractive index regions 80a.
[0085] The light-emitting device 100D_L of this embodiment has a region R1' in which the photo-coupled layer 80 exists (hereinafter referred to as the "first region") and a region R2' in which the photo-coupled layer 80 does not exist (hereinafter referred to as the "second region"). The first region R1' and the second region R2' are arranged to define a predetermined pattern when viewed from a plan view from the direction normal to the first main surface. Although not shown here, the first region R1' and the second region R2' can be arranged in the same way as the first region R1 and the second region R2 shown in Figure 2.
[0086] In the first region R1' where the optical coupling layer 80 exists, light propagating within the light guide layer 10 has difficulty reaching the light distribution control structure (internal space IS) due to total internal reflection in the optical coupling layer 80. Therefore, the first region R1' where the optical coupling layer 80 exists is a region that emits light at a relatively low brightness (or virtually no light) when lit (low-brightness emission region). In contrast, the second region R2' where the optical coupling layer 80 does not exist is a region that emits light at a relatively high brightness when lit (high-brightness emission region).
[0087] Here, each low refractive index region 80a is a porous region 81 having an internal void structure, and in this embodiment, the first region R1' and the second region R2' are distinguished by whether or not a porous region 81 is formed therein. As shown in Figure 10, the multiple porous regions 81 are formed only in the first region R1' of the two regions R2' (i.e., selectively in the first region R1'). As already explained, the multiple low refractive index regions 80a are multiple porous regions 81 having an internal void structure (i.e., defined by multiple porous regions 81), so the region where a porous region 81 exists becomes the first region R1' where the photo-coupled layer 80 exists, and the region where a porous region 81 does not exist becomes the second region R2' where the photo-coupled layer 80 does not exist.
[0088] As described above, in the light-emitting device 100D_L of this embodiment, the first region R1' in which the photo-coupling layer 80 exists and the second region R2' in which the photo-coupling layer 80 does not exist are arranged to define a predetermined pattern, thereby emitting light in such a way that the predetermined pattern can be seen. 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 that has multiple internal spaces IS (i.e., utilizes internal total internal reflection), so it can achieve high transparency (visible light transmittance). Moreover, the sheet-shaped light-emitting device 100D_L is suitably used as a light-emitting device for vehicles.
[0090] As a method for selectively forming the low refractive index region 80a (porous region 81) in the first region R1', coating or printing methods can be suitably used. When using the coating method, coating can be performed using a mask having a predetermined pattern. As for the printing method, plate-based printing methods such as gravure printing or plateless printing methods such as inkjet printing may be used.
[0091] (Embodiment 5) The light-emitting device (illumination device) 100E_L in this embodiment will be described with reference to Figure 11. Figure 11 is a schematic cross-sectional view showing the light-emitting device 100E_L. Below, the explanation will focus on the differences between the light-emitting device 100E_L in this embodiment and the light-emitting device 100D_L in Embodiment 4.
[0092] As shown in Figure 11, the light guide member 100E of 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 the direction conversion layer 60C provided on the third main surface 10b side of the light guide layer 10. This direction conversion layer 60C has the same configuration as the direction conversion layer 60C of the light-emitting device 100D_L of Embodiment 4.
[0093] Furthermore, the light guide member 100E further includes an optical coupling layer 80 provided between the light guide layer 10 and the direction conversion layer 60C. The optical coupling layer 80 has a refractive index n of the light guide layer 10. GP A refractive index n smaller than C It has multiple low refractive index regions 80a. The multiple low refractive index regions 80a are multiple porous regions 81 having a void structure inside.
[0094] The light-emitting device 100E_L of this embodiment also has a first region R1' in which the photo-coupling layer 80 exists and a second region R2' in which the photo-coupling layer 80 does not exist. The first region R1' and the second region R2' are arranged to define a predetermined pattern when viewed from a plan view from the direction normal 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 void structure of the porous region 81 is filled by an adhesive layer 56 provided in contact with the plurality of porous regions 81. As shown in Figure 11, the plurality of porous regions 81 include a plurality of first porous regions 81A located within the first region R1' in which the void structure is not filled by the adhesive layer 56, and a plurality of second porous regions 81B located within the second region R2' in which the void structure is substantially filled by the adhesive layer 56.
[0096] The region where the second porous region 81B, whose void structure is substantially filled by the adhesive layer 56, is located does not function as the photo-coupled layer 80. In other words, the multiple low refractive index regions 80a are defined by the multiple first porous regions 81A, whose void structure is not filled by the adhesive layer 56.
[0097] As the adhesive layer 56, an adhesive exemplified as suitable for forming the adhesive layer 52 can be used. In order for the adhesive layer 56 not to fill the void structure of the first porous region 81A among the plurality of porous regions 81, but to substantially fill the void structure of the second porous region 81B, for example, when laminating the laminated structure including the plurality of porous regions 81 and the base layer 31 with the light guide layer 10 via the adhesive layer 56 using a laminating machine, a mask having a mask pattern corresponding to the arrangement of the first region R1' and the second region R2' (with openings corresponding to the first region R1') can be used. Various conditions during lamination (such as the nip pressure of the laminating machine) can be appropriately set according to the specifications of the adhesive used and the material of the porous region 81.
[0098] Furthermore, the void structure of the second porous region 81B does not necessarily need to be completely filled by the adhesive layer 56; it is sufficient if it is substantially filled to the extent that it does not function as a photo-coupling layer 80. Also, even if the void structure of the second porous region 81B is completely filled by the adhesive layer 56, the refractive index of the second porous region 81B and the refractive index of the adhesive layer 56 may not perfectly match. 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] The light-emitting device 100E_L of this embodiment, like the light-emitting device 100D_L of Embodiment 4, can emit light in a predetermined pattern and can also achieve high transparency (visible light transmittance).
[0100] In the example described above, a configuration was described in which the void structure of the second porous region 81B is filled with adhesive layer 56. However, the second porous region 81B may be substantially filled with some material other than adhesive layer 56 so as not to function as a photo-coupling layer 80. In that case, the void structure of some of the porous regions 81 (the porous regions 81 that become the second porous region 81B) among the multiple porous regions 81 can be selectively filled with some material, and then the laminated structure including the multiple porous regions 81 and the base layer 31 and the light guide layer 10 can be laminated by bonding them together, for example, via adhesive layer 56. The material used to fill the void structure of the second porous region 81B is preferably a material in which the difference between the refractive index of the second porous region 81B and the refractive index of the adhesive layer 56 is 0.3 or less, and more preferably a material in which the difference is 0.2 or less.
[0101] (Embodiment 6) The light-emitting device (illumination device) 100F_L in this embodiment will be described with reference to Figure 12. Figure 12 is a schematic cross-sectional view showing the light-emitting device 100F_L. Below, the explanation will focus on the differences between the light-emitting device 100F_L in this embodiment and the light-emitting device 100A_L in Embodiment 1.
[0102] As shown in Figure 12, the light guide member 100F of the light-emitting device 100F_L differs from the light guide member 100A of the light-emitting device 100A_L in that the light guide layer 10W and the base layer 30W are configured such that their thickness increases as they move away from the light-receiving side surface 10a (i.e., from the light source LS). In other words, the light guide layer 10W and the base layer 30W of the light guide member 100F are each formed in a wedge shape.
[0103] In the light guide layer 10W, which is configured to increase in thickness as it moves away from the light-receiving side surface 10a, the angle between the light propagating in the Y direction within the light guide layer 10W toward the fourth main surface 10c and the fourth main surface 10c becomes smaller (i.e., the angle of incidence to the fourth main surface 10c becomes larger), compared to the light guide layer 10 which is configured to have a constant thickness. As a result, the amount of light leaking from the fourth main surface 10c (stray light) is reduced. Therefore, the directivity toward one side is improved.
[0104] Furthermore, in the substrate layer 30W, which is configured to increase in thickness as it moves away from the light source LS, stray light is reduced for the same reason, thus improving directivity to one side. The wedge-shaped substrate layer 30W may have a thickness similar to that of the wedge-shaped light guide layer 10W.
[0105] Furthermore, the same modifications as those described with reference to Figure 6 may be made to the light-emitting device 100A_L of Embodiment 1. That is, as shown in Figure 13, a light distribution control structure may be formed on the direction changing layer 60A' provided on the fourth main surface 10c side of the light guide layer 10W.
[0106] Furthermore, similar to the modified example described with reference to Figure 7 for the light-emitting device 100A_L of Embodiment 1, in addition to the light source LS that emits light toward the light-receiving side surface 10a of the light guide layer 10W, a further light source that emits light toward the end face of the substrate layer 30W (the 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 substrate layer 30W can be said to function as an additional light guide layer.
[0107] Furthermore, one of the light guide layer 10W and the substrate layer 30W may be replaced with a non-wedge-shaped material.
[0108] Furthermore, a wedge-shaped light guide layer 10W and / or substrate layer 30W may be used instead of the light guide layer 10 and / or substrate layer 30 of the light-emitting devices 100B_L, 100C_L, 100D_L, and 100E_L of Embodiments 2 to 5.
[0109] [Other examples of light distribution control structures] In the above description, an example was given in which a light distribution control structure having multiple internal spaces IS is formed in a direction conversion layer provided on one side of the two main surfaces of the light guide layer. However, a light distribution control structure having multiple internal spaces IS may also be formed in the light guide layer. Such a light guide layer can be manufactured, for example, by laminating a first film without a pattern and a second film with a desired fine pattern formed on it, or by bonding them together with an adhesive (including a pressure-sensitive adhesive).
[0110] For forming fine patterns on the second film, laser patterning, direct laser imaging, laser drilling, and laser or electron beam irradiation with or without a mask are used. Individual properties may also be imparted by printing, inkjet printing, screen printing, etc., and the material and refractive index may be modified. Micro / nano dispensing, dosing, direct "writing," discrete laser sintering, micro-electrical discharge machining (micro-EDM), or micro-machining, micro-forming, imprinting, embossing, and similar methods may also be used.
[0111] [Anti-reflective layer, anti-glare layer, and hard coat layer] The light-emitting device according to the embodiments of the present invention is not limited to the examples described above and can be modified in various ways. For example, instead of the base layer 30 of the light-emitting device 100A_L, an anti-reflective layer, an anti-glare layer, and / or a hard coat layer (for example, with a pencil hardness of H or higher) may be provided. Of course, the anti-reflective layer, anti-glare layer, and / or a hard coat layer may also be provided on the base layer 30. Furthermore, the anti-reflective layer, anti-glare layer, and / or a hard coat layer may be provided on the side of the light guide layer 10 opposite to the base layer 30. The anti-reflective layer, anti-glare layer, and hard coat layer can be formed using known materials and by known methods.
[0112] [Application to building materials] The aforementioned sheet-like transparent light-emitting devices are used as building components. These devices can be used as building components themselves, or as part of other building components. Building components include both exterior and interior applications. For example, they can be used as window components, wall components, partitions, ceiling (skylight) components, stair components, handrail components, and floor components. They can also be used as light-emitting devices (lighting devices) for streets, security, emergency use, gardens, swimming pools / ponds (underwater), warehouses, factories, and under eaves (outdoors). In all cases, when not in use, they are used as transparent sheets. [Industrial applicability]
[0113] According to embodiments of the present invention, it is possible to provide a light-emitting device that can emit light in a predetermined pattern and achieve sufficiently high transparency, and a light guide member for such a light-emitting device that is suitably used in such a device. The light-emitting device according to embodiments of the present invention is suitably used in automotive applications. [Explanation of Symbols]
[0114] 10, 10W light guide layer 30, 30W, 31 base material layer 52, 54, 56 Adhesive layer 60A, 60A', 60B, 60C Directional change layer 62A, 62B Shaping film 64 recess 64A First recess 64B Second recess 80 Optical coupling layer 80a Low refractive index region 81 Porous region 81A 1st porous area 81B 2nd porous area 100A, 100B, 100C, 100D, 100E, 100F Light guide members 100A_L, 100B_L, 100C_L Light-emitting device 100D_L, 100E_L, 100F_L Light-emitting device IS interior space ISa First Incline ISb 2nd slope LS light source R1, R1' 1st region R2, R2' second area
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 section that receives light emitted from a light source, a light-guiding 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 multiple internal spaces, wherein the multiple internal spaces form interfaces that direct a portion of the light propagating within the light guide layer toward the first main surface side by internal total internal reflection, A shaped film having a fifth main surface having multiple recesses, It has, When viewed from a plane in the direction normal to the first main surface, the first region where the light distribution control structure exists and the second region where the light distribution control structure does not exist are arranged to define a predetermined pattern. The plurality of recesses include a plurality of first recesses located within the first region that are not filled, and a plurality of second recesses located within the second region that are substantially filled. The plurality of internal spaces are defined by the plurality of first recesses of the shaped film, and this is a light guide member for a light-emitting device.
2. The shaping film has an adhesive layer disposed on the fifth main surface side, 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 light guide member for a light-emitting device according to claim 1, wherein the plurality of internal spaces are defined by the plurality of first recesses of the shaping film and the adhesive layer.
3. 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 section that receives light emitted from a light source, a light-guiding 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 multiple internal spaces, wherein the multiple internal spaces form interfaces that direct a portion of the light propagating within the light guide layer toward the first main surface side by internal total internal reflection, A shaped film having a fifth main surface having multiple recesses, It has, When viewed from a plane in the direction normal to the first main surface, the first region where the light distribution control structure exists and the second region where the light distribution control structure does not exist are arranged to define a predetermined pattern. 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 shaped film, and this is a light guide member for a light-emitting device.
4. The shaping film has an adhesive layer disposed on the fifth main surface side, The light guide member for a light-emitting device according to claim 3, wherein the plurality of internal spaces are defined by the plurality of recesses of the shaping film and the adhesive layer.
5. 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 section that receives light emitted from a light source, a light-guiding 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 multiple internal spaces, wherein the multiple internal spaces form interfaces that direct a portion of the light propagating within the light guide layer toward the first main surface side by internal total internal reflection, It has, When viewed from a plane in the direction normal to the first main surface, the first region where the light distribution control structure exists and the second region where the light distribution control structure does not exist are arranged to define a predetermined pattern. The plurality of internal spaces are formed in a direction changing layer provided on the third main surface side or the fourth main surface side of the light guide layer, in a light guide member for a light-emitting device.
6. The optical coupling layer is further provided between the light guide layer and the direction conversion layer, The light-emitting device light guide member according to claim 5, wherein the light-coupling layer has a plurality of low refractive index regions having a refractive index smaller than that of the light guide layer.
7. 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 section that receives light emitted from a light source, a light-guiding 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 multiple internal spaces, wherein the multiple internal spaces form interfaces that direct a portion of the light propagating within the light guide layer toward the first main surface side by internal total internal reflection, It has, The plurality of internal spaces are formed in the 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 the light-emitting device is An optical coupling layer provided between the light guide layer and the direction conversion layer, further comprising an optical coupling layer having a plurality of low refractive index regions having a refractive index smaller than that of the light guide layer, A light guide member for a light-emitting device, wherein, when viewed from a plane direction normal 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 to define a predetermined pattern.
8. Provided between the light guide layer and the direction changing layer, having a plurality of porous regions with an internal void structure, The plurality of porous regions are formed only in the first region of the first region and the second region. The light guide member for a light-emitting device according to claim 7, wherein the plurality of low refractive index regions are defined by the plurality of porous regions.
9. Provided between the light guide layer and the direction changing layer, having a plurality of porous regions with an internal void structure, The plurality of porous regions include a plurality of first porous regions located within the first region in which the void structure is not filled, and a plurality of second porous regions located within the second region in which the void structure is substantially filled. The light guide member for a light-emitting device according to claim 7, wherein the plurality of low refractive index regions are defined by the plurality of first porous regions.
10. The adhesive layer is 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 light guide member for a light-emitting device according to claim 9, wherein the void structure of the plurality of second porous regions is substantially filled by the adhesive layer.
11. The light guide layer is configured such that its thickness increases as it moves away from the light receiving section. A light guide member for a light-emitting device according to any one of claims 1 to 10.
12. A light guide member for a light-emitting device according to any one of claims 1 to 10, A light source that emits light toward the light receiving unit, A light-emitting device equipped with the following features.