Optical member and illumination device

Abstract

The invention provides an optical component with high designability and a lighting device. An optical member according to one embodiment of the present invention comprises: a light guide member having an incident surface for light from a light source, a first emission surface, and a second emission surface different from the first emission surface; a first light extraction unit that is disposed in a first region of the light guide member and that causes the light guided inside the light guide member to exit from the first exit surface; and a second light extraction unit that is disposed in a second region that does not overlap the first region in the light guide member when viewed from the thickness direction of the light guide member, and that causes the light guided inside the light guide member to exit from the second exit surface.

Description

Technical Field

[0001] The present invention relates to an optical component and a lighting device. Background Art

[0002] Conventionally, an optical component that can emit light incident from a light source and guided inside has been known. In addition, a lighting device including the optical component has been known.

[0003] Patent Document 1 discloses a lighting device that extracts light from a light guide plate by providing uneven surfaces on the light guide plate or disposing a light diffusion film having a light scattering element on the light guide plate. In addition, Patent Document 2 discloses a lighting device that emits light guided inside a light guide body from a predetermined emission surface.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2019-75352

[0007] Patent Document 2: Japanese Unexamined Patent Application Publication No. 2022-101353 Summary of the Invention

[0008] Technical Problem to be Solved by the Invention

[0009] However, the lighting devices disclosed in Patent Document 1 and Patent Document 2 extract light from one side of an optical component such as a light guide plate, or extract light from both sides in an overlapping region when viewed in the thickness direction of the optical component. From the viewpoint of design, there is room for improvement.

[0010] An object of the present invention is to provide an optical component and a lighting device with high design.

[0011] Technical Solution for Solving the Technical Problem

[0012] An optical component according to one aspect of the present invention includes: a light guide component having an incident surface of light from a light source, a first emission surface, and a second emission surface different from the first emission surface; a first light extraction unit disposed in a first region of the light guide component to emit the light guided inside the light guide component from the first emission surface; and a second light extraction unit disposed in a second region of the light guide component that does not overlap with the first region when viewed in the thickness direction of the light guide component to emit the light guided inside the light guide component from the second emission surface.

[0013] Advantageous Effects of the Invention

[0014] According to the present invention, an optical component and a lighting device with high design can be provided. Brief Description of the Drawings

[0015] Figure 1 is the front view of the lighting device of the embodiment.

[0016] Figure 2 is the rear view of the lighting device of the embodiment.

[0017] Figure 3 is Figure 1 the sectional view taken along line III-III in

[0018] Figure 4 is a view showing Figure 1 a detailed configuration example of the gap in the lighting device of

[0019] Figure 5 a view for explaining the angle formed by the optical axis of the emitted light and the normal line of the emission surface.

[0020] Figure 6 is the sectional view of the lighting device of the first modification.

[0021] Figure 7 is the sectional view of the lighting device of the second modification.

[0022] Figure 8 is the sectional view of the lighting device of the third modification.

[0023] Figure 9 is the sectional view of the lighting device of the fourth modification. Detailed Embodiments

[0024] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each drawing, the same reference numerals are given to the same components, and repeated descriptions are appropriately omitted.

[0025] The embodiments shown below are illustrative descriptions of optical components and lighting devices for embodying the technical idea of the present disclosure, and do not limit the present disclosure to the embodiments shown below. Regarding the dimensions, materials, shapes, and relative arrangements of the components described below, unless otherwise specified, they are not intended to be limited to the scope of the present disclosure, but are intended to be illustrative descriptions. Also, regarding the sizes and positional relationships of the components shown in the drawings, there are cases where they are exaggerated for clarity of explanation.

[0026] In each of the drawings, as an expression of directions, an orthogonal coordinate system having an X-axis, a Y-axis, and a Z-axis is used. The X-axis, the Y-axis, and the Z-axis are substantially orthogonal to each other. The Y-direction along the Y-axis represents the thickness direction of the light guide member included in the optical member of the embodiment. The direction indicated by the arrow of the X-axis is denoted as the +X direction, and the direction opposite to the +X direction is denoted as the -X direction. The direction indicated by the arrow of the Y-axis is denoted as the +Y direction, and the direction opposite to the +Y direction is denoted as the -Y direction. The direction indicated by the arrow of the Z-axis is denoted as the +Z direction, and the direction opposite to the +Z direction is denoted as the -Z direction. However, the expression of these directions does not limit the directions of the embodiment.

[0027] [Embodiment]

[0028] <Example of the configuration of the lighting device 100>

[0029] Refer to Figures 1 to 5 , and an example of the configuration of the lighting device 100 of the embodiment will be described. Figure 1 is the front view of the lighting device 100. Figure 2 is the rear view of the lighting device 100. Figure 3 is Figure 1 the sectional view taken along line III-III in Figure 4 is a diagram showing an example of the detailed configuration of the gap 200 in the lighting device 100. Figure 5 is a diagram for explaining the angle formed by the optical axis of the light emitted from the light guide member 30 included in the lighting device 100 and the normal line of the emission surface.

[0030] As Figure 1 ~As Figure 3 shown, the lighting device 100 includes a light source 10 and an optical member 20. As Figure 3 shown, the optical member 20 includes a light guide member 30, a first light extraction layer 40, and a second light extraction layer 50. The light guide member 30 has an incident surface 31 for the light L from the light source 10, a first emission surface 32, and a second emission surface 33 different from the first emission surface 32.

[0031] The light guide member 30 here is a plate-like member with the direction along the Y-axis as the thickness direction. The optical member 20 is configured to include at least a material having a transmittance to visible light. Visible light refers to light having a wavelength of 400 nm or more and 780 nm or less. The total light transmittance of the optical member 20 can be 60% or more, preferably 70% or more, and more preferably 80% or more. Here, the total light transmittance refers to the transmittance to visible light. The total light transmittance can be measured using, for example, a haze meter in accordance with JIS K7361-1. In addition, the haze value of the optical member 20 can also be less than 30%, preferably less than 10%, and more preferably less than 5%. Since the total light transmittance is 60% or more and the haze value is less than 30%, the optical member 20 can be visually recognized as a transparent plate-like member by an observer observing the lighting device 100.

[0032] The lighting device 100 emits the light L emitted from the light source 10, which enters the inside of the light guide member 30 through the incident surface 31 and is guided inside the light guide member 30, and emits the light L from the first emission surface 32 and the second emission surface 33, respectively. In the example shown in this specification, the light source 10 emits the light L toward the +Z direction side, but it is not limited thereto, and the light emission direction of the light source 10 can be arbitrary. This light emission direction refers to the propagation direction of the light L along the optical axis.

[0033] The lighting device 100 irradiates the first emitted light La emitted from the first emission surface 32 toward the +Y direction and irradiates the second emitted light Lb emitted from the second emission surface 33 toward the -Y direction. That is, the lighting device 100 can irradiate the first emitted light La and the second emitted light Lb in different directions that differ by 180°. The first emitted light La and the second emitted light Lb are lights whose respective optical axes are along the Y-axis, and they can be any one of diffused light, convergent light, or parallel light. In addition, the lighting device 100 is not limited to irradiating the first emitted light La and the second emitted light Lb at 180°, and can also irradiate them in any different directions. This different direction refers to a direction different from the propagation direction of the light along the respective optical axes of the first emitted light La and the second emitted light Lb.

[0034] The first emission surface 32 is located on the side of the light guide member 30 opposite to the second emission surface 33 and is a surface facing the second emission surface 33. The first emission surface 32 is a surface substantially parallel to the second emission surface 33. The incident surface 31 is a surface substantially orthogonal to the first emission surface 32 and the second emission surface 33, respectively. However, the first emission surface 32 can also be a surface intersecting the second emission surface 33.

[0035] The incident surface 31 may also be a surface that intersects the first exit surface 32 and the second exit surface 33 respectively. Additionally, the incident surface 31 may be a surface that is substantially parallel to at least one of the first exit surface 32 and the second exit surface 33, or may be a part of at least one of the first exit surface 32 and the second exit surface 33.

[0036] The thickness direction of the plate-like component in the light guide component 30 is not limited to the direction along the Y-axis, and can be any direction. Additionally, the light guide component 30 is not limited to a plate-like component, and can also be components of various shapes such as a block component.

[0037] The first light extraction layer 40 is an example of a first light extraction portion that is disposed in the first region 101 of the light guide component 30 and causes the light L that is guided inside the light guide component 30 to exit from the first exit surface 32. As Figure 1 and Figure 2 shown, the first region 101 in the lighting device 100 is a region having an annular shape on the second exit surface 33 of the light guide component 30. However, the shape of the first region 101 is not limited to an annular shape and can be appropriately changed.

[0038] The first light extraction layer 40 is disposed on the side of the second exit surface 33 of the light guide component 30. In Figures 1 to 3 the example shown, the first light extraction layer 40 is interposed with an adhesive layer 61 and fixed to the base material layer 62. A film-like component is formed by the first light extraction layer 40, the adhesive layer 61, and the base material layer 62. The surface of the first light extraction layer 40 opposite to the surface facing the base material layer 62 faces the second exit surface 33 of the light guide component 30, is interposed with an adhesive layer 34, and is adhesively fixed to the second exit surface 33. However, instead of the first light extraction layer 40 being interposed with an adhesive layer 61 and fixed to the base material layer 62, the first light extraction layer 40 alone can be interposed with an adhesive layer 34 and fixed to the second exit surface 33.

[0039] When viewed in the thickness direction of the light guide component 30, the second light extraction layer 50 is an example of a second light extraction portion that is disposed in the second region 102 of the light guide component 30 that does not overlap with the first region 101 and causes the light L that is guided inside the light guide component 30 to exit from the second exit surface 33. The second region 102 in the lighting device 100 is the region other than the first region 101 on the second exit surface 33 of the light guide component 30. The shape of the second region 102 can be appropriately changed according to the shape of the first region 101.

[0040] The second light extraction layer 50 is disposed on the side of the second exit surface 33 of the light guide component 30. In Figures 1 to 3In the example shown, the second light extraction layer 50 is sandwiched by an adhesive layer 61 and fixed to the substrate layer 62. The second light extraction layer 50, the adhesive layer 61, and the substrate layer 62 are used to form a film-like component. The surface of the second light extraction layer 50 opposite to the surface facing the substrate layer 62 faces the second emission surface 33 of the light guide member 30, is sandwiched by an adhesive layer 34, and is adhesively fixed to the second emission surface 33. However, instead of the second light extraction layer 50 being sandwiched by an adhesive layer 61 and fixed to the substrate layer 62, the second light extraction layer 50 alone can be sandwiched by an adhesive layer 34 and fixed to the second emission surface 33.

[0041] As Figure 3 shown, the first light extraction layer 40 and the second light extraction layer 50 each have an orientation control structure including a plurality of voids 200. The voids 200 contain an air layer inside. The voids 200 can also be referred to as air cavities. When viewed in the thickness direction of the light guide member 30, the voids 200 have a substantially square outer shape. However, the outer shape of the voids 200 when viewed in the thickness direction of the light guide member 30 is not limited to a substantially square shape, and can also be a substantially rectangular shape, a substantially circular shape, a substantially elliptical shape, or a substantially polygonal shape.

[0042] As Figure 4 shown, the plurality of voids 200 each include a reference plane 210, a first inclined plane 201, and a second inclined plane 202. The plurality of voids 200 are respectively arranged in a row and column pattern within the first light extraction layer 40 and the second light extraction layer 50 in a plane substantially parallel to the second emission surface 33. However, the arrangement of the plurality of voids 200 is not limited to a row and column pattern, and can also be any arrangement such as a concentric circle pattern, a radial pattern, an interleaved pattern, or a randomly dispersed arrangement. In addition, the arrangement of the plurality of voids 200 is not limited to being arranged in a plane substantially parallel to the second emission surface 33, and can also be arranged in a plane inclined with respect to the second emission surface 33, or can be three-dimensionally dispersed within the first light extraction layer 40 and the second light extraction layer 50 respectively.

[0043] As Figure 3 and Figure 4 shown, the first inclined plane 201 in the void 200 totally reflects a part of the light L guided inside the light guide member 30. The second inclined plane 202 is located on the side of the void 200 opposite to the first inclined plane 201. The reference plane 210 is a plane substantially parallel to the second emission surface 33. However, the reference plane 210 can also be a plane substantially parallel to either the first emission surface 32 or the second emission surface 33.

[0044] The first tilt angle θa is the angle of the first inclined surface 201 with respect to the reference surface 210. The second tilt angle θb is the angle of the second inclined surface 202 with respect to the reference surface 210. In the present embodiment, as an example, the first tilt angle θa is 49°. As an example, the second tilt angle θb is 85°.

[0045] In the light L that is guided inside the light guide member 30, the light L1 contained in the first light extraction layer 40 and totally reflected on the first inclined surface 201 of the gap 200 propagates in the +Y direction with its optical axis along the Y-axis, enters the inside of the light guide member 30 through the first light extraction layer 40, the adhesive layer 34, and the second exit surface 33. Moreover, after passing through the inside of the light guide member 30, this light L is irradiated as the first exit light La through the first exit surface 32.

[0046] Here, as Figure 4 shown, there is also a case where a part of the light L that is guided inside the light guide member 30 and enters the first inclined surface 201 of the gap 200 contained in the first light extraction layer 40 is not totally reflected on the first inclined surface 201, but after passing through the inside of the gap 200, passes through the reference surface 210 and becomes the leakage light L2 that propagates in the direction opposite to the light L1. In addition, as Figure 3 shown, when there is a difference in refractive index at the interfaces of the first light extraction layer 40, the adhesive layer 34, and the light guide member 30 for a part of the light L1 totally reflected on the first inclined surface 201, Fresnel reflection may occur and become the Fresnel reflection light Fr that propagates in the direction opposite to the light L1. That is, in the optical member 20, in addition to the first exit light La that exits from the first exit surface 32 through the first light extraction layer 40, there are also lights such as the leakage light L2 and the Fresnel reflection light Fr that propagate in the direction opposite to the first exit light La. However, compared with the light quantity of the first exit light La, its light quantity is small.

[0047] On the other hand, as Figure 3 and Figure 4 shown, a part of the light L that is guided inside the light guide member 30 enters the inside of the second light extraction layer 50 through the second exit surface 33, the adhesive layer 34, the base material layer 62, and the adhesive layer 61. The light L that enters the inside of the second light extraction layer 50 is totally reflected on the first inclined surface 201 of the gap 200 contained in the second light extraction layer 50. The light L1 totally reflected on the first inclined surface 201 propagates in the -Y direction with its optical axis along the Y-axis and is irradiated as the second exit light Lb.

[0048] Here, as Figure 4As shown, there is also a part of the light L that is guided inside the light guide member 30 and is incident on the first inclined surface 201 of the gap 200 included in the second light extraction layer 50. This part of the light L is not totally reflected on the first inclined surface 201, but after passing through the inside of the gap 200, it passes through the reference surface 210 and becomes leakage light L2 that propagates in the direction opposite to the light L1. That is, in the optical member 20, in addition to the second emitted light Lb that is emitted from the second emission surface 33 through the second light extraction layer 50, there is also light such as the leakage light L2 that propagates in the direction opposite to the second emitted light Lb. However, compared with the light quantity of the second emitted light Lb, its light quantity is small.

[0049] Due to the action of the above-mentioned first light extraction layer 40, as Figure 1 shown, when an observer observes the lighting device 100 from the +Y direction side, in the first region 101, the first emitted light La that is irradiated toward the +Y direction side through the first emission surface 32 can be visually confirmed. That is, the observer can visually confirm the brightly emitting first region 101. On the other hand, in the second region 102, since there is no light irradiated toward the +Y direction side, the observer can see through and visually confirm the opposite side (-Y direction side) of the optical member 20.

[0050] In addition, due to the action of the above-mentioned second light extraction layer 50, as Figure 2 shown, when the observer observes the lighting device 100 from the -Y direction side, in the second region 102, the second emitted light Lb that is irradiated toward the -Y direction side through the second emission surface 33 can be visually confirmed. That is, the observer can visually confirm the brightly emitting second region 102. On the other hand, in the first region 101, since there is no light irradiated toward the -Y direction side, the observer can see through and visually confirm the opposite side (+Y direction side) of the optical member 20.

[0051] Furthermore, when the light source 10 is turned off, the entire optical member 20 in the lighting device 100 becomes transparent. When observing from either the +Y direction or the -Y direction, the observer can also see through and visually confirm the opposite side in the entire region of the optical member 20.

[0052] As described above, in the present embodiment, the lighting device 100 irradiates the first emitted light La in the +Y direction from the first emission surface 32 of the light guide member 30, and irradiates the second emitted light Lb in the -Y direction from the second emission surface 33 of the light guide member 30. In other words, the lighting device 100 irradiates the first emitted light La and the second emitted light Lb in arbitrarily different directions. Thus, the emitted light can be extracted from both the first emission surface 32 and the second emission surface 33 of the light guide member 30. Moreover, the lighting device 100 can extract the emitted light from both the first emission surface 32 and the second emission surface 33 of the light guide member 30 in the first region 101 and the second region 102 which are non-overlapping regions when viewed from the thickness direction of the light guide member 30. These results indicate that, in the present embodiment, the optical component 20 and the lighting device 100 with high designability can be provided. In addition, when the first region 101 and the second region 102 are viewed from the thickness direction of the light guide member 30, if the overlapping degree can be regarded as a manufacturing error, it can also be called overlapping. The "overlapping degree that can be regarded as a manufacturing error" here means that when viewed from the thickness direction of the light guide member 30, the overlapping of a length of 1 / 10 or less of the length in the longitudinal direction of the first emission surface 32, or the overlapping of a length of 1 / 10 or less of the length in the longitudinal direction of the second emission surface 33.

[0053] In addition, in the present embodiment, the first light extraction layer 40 (first light extraction portion) and the second light extraction layer 50 (second light extraction portion) each have an alignment control structure including a plurality of voids 200. Each of the plurality of voids 200 has a first inclined surface 201 that totally reflects a part of the light L guided inside the light guide member 30, and a second inclined surface 202 located on the side opposite to the first inclined surface 201 in the void 200. In the present embodiment, by having such voids 200, the first light extraction layer 40 and the second light extraction layer 50 for extracting the first emitted light La and the second emitted light Lb from a predetermined surface or a predetermined direction in the light guide member 30 can be simply fabricated respectively.

[0054] In addition, in the present embodiment, the first light extraction layer 40 and the second light extraction layer 50 are arranged on the second emission surface 33 side of the light guide member 30, that is, on the same surface side. With this arrangement, when viewed from the thickness direction of the light guide member 30, alignment can be easily performed so that the first light extraction layer 40 and the second light extraction layer 50 do not overlap. As a result, the optical component 20 and the lighting device 100 can be efficiently manufactured.

[0055] In addition, in the present embodiment, the thickness of the first light extraction layer 40 may also be the same as the thickness of the second light extraction layer 50. By making the thicknesses of the first light extraction layer 40 and the second light extraction layer 50 the same, when the first light extraction layer 40 and the second light extraction layer 50 are arranged on the same side of the light guide member 30, no step will be generated between the first light extraction layer 40 and the second light extraction layer 50. Thus, the designability of the optical component 20 and the lighting device 100 can be improved. In addition, "the same thickness" does not require the two thicknesses to be strictly the same, and a thickness difference of 1 / 5 or less between the two design values of the thicknesses is allowed.

[0056] In addition, in the present embodiment, the angle formed by the optical axis of the first emitted light La emitted from the first emission surface 32 of the light guide member 30 and the normal line of the first emission surface may be 0° or more and less than 50°. In addition, the angle formed by the optical axis of the second emitted light Lb emitted from the second emission surface 33 of the light guide member 30 and the normal line of the second emission surface 33 may be 0° or more and less than 50°.

[0057] In Figure 5 it, the first emission angle φa shows the angle formed by the first optical axis La0 of the first emitted light La emitted from the first emission surface 32 of the light guide member 30 and the first normal line 320 of the first emission surface 32. In addition, the second emission angle φb shows the angle formed by the second optical axis Lb0 of the second emitted light Lb emitted from the second emission surface 33 of the light guide member 30 and the second normal line 330 of the second emission surface 33.

[0058] In the present embodiment, by setting the first emission angle φa to be 0° or more and less than 50°, the contrast of the first region 101 that can be visually confirmed through the first emitted light La can be improved. In addition, in the present embodiment, by setting the second emission angle φb to be 0° or more and less than 50°, the contrast of the second region 102 that can be visually confirmed through the second emitted light Lb can be improved. In addition, in Figures 1 to 4 the lighting device 100 shown, both the first emission angle φa and the second emission angle φb are 0°. However, the first emission angle φa and the second emission angle φb are not limited to 0° or more and less than 50°, and may be angles other than these, and the first emission angle φa and the second emission angle φb may also be different.

[0059] In addition, in the present embodiment, the first inclination angle θa may be 10° or more and 70° or less, and the second inclination angle θb may be 50° or more and 100° or less. With this configuration, the contrast of the first region 101 that can be visually confirmed through the first emitted light La and the contrast of the second region 102 that can be visually confirmed through the second emitted light Lb can be improved respectively, and the designability of the optical component 20 and the lighting device 100 can be improved.

[0060] In addition, in the present embodiment, the total light transmittance of the light guide member 30 may also be 60% or more. With this configuration, the observer of the observation lighting device 100 can visually recognize the light guide member 30 as a plate-like member that is transparent to visible light, and the designability of the optical member 20 and the lighting device 100 can be improved.

[0061] In addition, in the present embodiment, the haze value of the light guide member 30 may also be less than 30%. With this configuration, the observer of the observation lighting device 100 can visually recognize the light guide member 30 as a plate-like member that is transparent to visible light, and the designability of the optical member 20 and the lighting device 100 can be improved.

[0062] Furthermore, in the present embodiment, the first light extraction layer 40, which is a different member from the light guide member 30, is taken as an example of the first light extraction portion, and the second light extraction layer 50, which is a different member from the light guide member 30, is taken as an example of the second light extraction portion, but it is not limited to these. At least one of the first light extraction portion and the second extraction portion may also be a part of the light guide member 30 formed on the light guide member 30. That is, the light guide member 30 may also have at least one of the first light extraction portion and the second light extraction portion. For example, the light guide member 30 may be one member, with the first light extraction portion provided on one side of the one member and the second light extraction portion provided on the other side. In addition, two light guide members 30 including a light guide member provided with the first light extraction portion and a light guide member provided with the second light extraction portion may also be prepared.

[0063] [Modification Example]

[0064] The lighting device of the embodiment can be variously deformed from the above-described lighting device 100. Hereinafter, this modification example will be described. In addition, the same names and reference numerals as those of the described embodiment and the modification example represent the same or homogeneous components or constituent parts, and the detailed description will be appropriately omitted. This also applies to the modification examples shown later.

[0065] <First Modification Example>

[0066] Figure 6 is a cross-sectional view of the lighting device 100a of the first modification example. The front view of the lighting device 100a is the same as the Figure 1 front view of the lighting device 100 shown. The rear view of the lighting device 100a is the same as the Figure 2 rear view of the lighting device 100 shown. Figure 6 is a cross-sectional view corresponding to the line III-III in Figure 1 .

[0067] The difference between this modification example and the above-described lighting device 100 is that the first light extraction layer 40 is disposed on the side of the first emission surface 32 of the light guide member 30.

[0068] As Figure 6 shown, the lighting device 100a is different from the above lighting device 100 in that it has an optical component 20a. The optical component 20a is different from the above optical component 20 in that it has a first light extraction layer 40 disposed on the first emission surface 32 side of the light guide member 30.

[0069] By disposing the first light extraction layer 40 on one side of the first emission surface 32 of the light guide member 30, when the first emitted light La is emitted from the first emission surface 32 through the first light extraction layer 40, since the first emitted light La does not pass through the second emission surface 33 and the adhesive layer 34, Fresnel reflection does not occur at the interfaces of the light guide member 30 and the adhesive layer 34 respectively, and Fresnel reflection loss can be reduced. Thus, a lighting device 100a with high irradiation efficiency of the first emitted light La can be provided. In this modification, the effects other than the arrangement position of the first light extraction layer 40 in the light guide member 30 are the same as those of the above lighting device 100.

[0070] <Second Modification>

[0071] Figure 7 is a cross-sectional view of the lighting device 100b of the second modification. The front view of the lighting device 100b is the same as that of the lighting device 100 Figure 1 shown. The rear view of the lighting device 100b is the same as that of the lighting device 100 Figure 2 shown. Figure 7 is a cross-sectional view corresponding to the line III-III in Figure 1 .

[0072] In this modification, the second light extraction layer 50 of the lighting device 100b is different from the above lighting device 100 in that it is disposed on one side of the first emission surface 32 of the light guide member 30.

[0073] As Figure 7 shown, the lighting device 100b is different from the above lighting device 100 in that it has an optical component 20b. The optical component 20b is different from the above optical component 20 in that it has a second light extraction layer 50 disposed on one side of the first emission surface 32 of the light guide member 30. In this modification, the effects other than the arrangement position of the second light extraction layer 50 in the light guide member 30 are the same as those of the above lighting device 100.

[0074] <Third Modification>

[0075] Figure 8 is a cross-sectional view of the lighting device 100c of the third modification. The front view of the lighting device 100c is the same as that of Figure 1is the same as the front view of the lighting device 100 shown. The rear view of the lighting device 100c is the same as Figure 2 the rear view of the lighting device 100 shown. Figure 8 is a cross-sectional view corresponding to Figure 1 the line III-III in

[0076] In this modified example, the difference from the above lighting device 100 is that instead of the first light extraction layer 40 of the lighting device 100, a plurality of diffusion point members 70 are arranged on the side of the first emission surface 32 of the light guide member 30.

[0077] As Figure 8 shown, the difference between the lighting device 100c and the above lighting device 100 is that it has an optical member 20c. The difference between the optical member 20c and the above optical member 20 is that it has a plurality of diffusion point members 70 arranged on the side of the first emission surface 32 of the light guide member 30.

[0078] The plurality of diffusion point members 70 are an example of a first light extraction portion that is arranged in the first region 101 of the light guide member 30 and causes the light L guided inside the light guide member 30 to exit from the first emission surface 32. The diffusion point member 70 is a member containing particles having light diffusibility. The plurality of diffusion point members 70 diffuse the light L guided inside the light guide member 30 through the particles, so that a part of the diffused light can exit from the first emission surface 32. The plurality of diffusion point members 70 are discretely arranged on the first emission surface 32. The arrangement of the plurality of diffusion point members 70 can also be any arrangement such as in a row and column pattern, concentric circle pattern, radial pattern, staggered pattern, randomly dispersed arrangement, etc.

[0079] In this modified example, the effects other than the arrangement position of the plurality of diffusion point members 70 as the first light extraction portion in the light guide member 30 are the same as those of the above lighting device 100. In addition, the plurality of diffusion point members 70 can be applied to at least one of the first light extraction portion and the second light extraction portion. Also, in Figure 8 it was described that the second light extraction portion 50 is arranged on the second emission surface 33, but by arranging on the Figure 7 side of the first emission surface 32 shown, the plurality of diffusion point members 70 and the second light extraction portion 50 can also be located on the same surface.

[0080] <Fourth Modified Example>

[0081] Figure 9 is a cross-sectional view of the lighting device 100d of the fourth modified example. The front view of the lighting device 100d is the same as Figure 1 the front view of the lighting device 100 shown. The rear view of the lighting device 100d is the same as Figure 2It is the same as the rear view of the lighting device 100 shown. Figure 9 It corresponds to Figure 1 a sectional view taken along line III-III in

[0082] In this modified example, the difference from the above lighting device 100 is that, instead of the first light extraction layer 40 of the lighting device 100, a diffusion sheet member 80 is disposed on one side of the first emission surface 32 of the light guide member 30.

[0083] As Figure 9 shown, the difference between the lighting device 100d and the above lighting device 100 is that it has an optical member 20d. The difference between the optical member 20d and the above optical member 20 is that it has a diffusion sheet member 80 disposed on one side of the first emission surface 32 of the light guide member 30.

[0084] The diffusion sheet member 80 is an example of a first light extraction portion that is disposed in the first region 101 of the light guide member 30 and emits the light L guided inside the light guide member 30 from the first emission surface 32. The diffusion sheet member 80 is a sheet-like member containing particles having light diffusibility. The diffusion sheet member 80 diffuses the light L guided inside the light guide member 30 by the particles, so that a part of the diffused light can be emitted from the first emission surface 32. The diffusion sheet member 80 is fixed to the first emission surface 32 by an adhesive member or the like.

[0085] In this modified example, the effects other than the arrangement position of the diffusion sheet member 80 as the first light extraction portion in the light guide member 30 are the same as those of the above lighting device 100. In addition, the diffusion sheet member 80 can be applied to at least one of the first light extraction portion and the second light extraction portion. Also, in Figure 9 it was described that the second light extraction portion 50 is disposed on the second emission surface 33, but as Figure 7 shown, by being disposed on one side of the first emission surface 32, a plurality of diffusion sheet members 80 and the second light extraction portion 50 can also be located on the same plane.

[0086] In addition to the above, the first light extraction portion and the second light extraction portion can also be provided by providing irregularities on the light guide member 30. That is, the light guide member 30 can have a first light extraction portion and a second light extraction portion. For example, the light guide member 30 can be one member, and the first light extraction portion is provided by providing irregularities on one side of the one member, and the second light extraction portion is provided by providing irregularities on the other side. Also, two light guide members including a light guide member provided with a first light extraction portion and a light guide member provided with a second light extraction portion can be prepared.

[0087] In addition, the optical component of the present invention may further have other functional layers not shown. For example, a refractive index changing layer may be provided between the light guide component and the light extraction layer. The refractive index changing layer is a layer for suppressing the attenuation of brightness as the distance from the light source increases, and has a plurality of regions with different refractive indices. For example, a layer in which the number of low refractive index regions is larger closer to the light source and the number of high refractive index regions is larger farther from the light source. In addition, a surface treatment layer such as a hard coat layer and a low refractive index layer may be provided on the side opposite to the light guide component of the light extraction layer. A surface treatment layer such as a hard coat layer and a low refractive index layer may also be provided on the side opposite to the light extraction layer of the light guide component.

[0088] [Examples of the respective components of the lighting device in the embodiment]

[0089] Preferred examples of the respective components of the lighting device in the embodiment will be described. The examples of the first light extraction layer 40 and the second light extraction layer 50 shown below can be applied to the above-described lighting devices 100, 100a, and 100b. In addition, the examples of the light guide component 30, the base material layer 62, the adhesive layer 34, and the adhesive layer 61 shown below can be applied to the above-described lighting devices 100, 100a, 100b, 100c, and 100d.

[0090] The first light extraction layer 40 and the second light extraction layer 50 are each formed as a shaped film, for example. The shaped film can be manufactured, for example, by the following method. An uneven shaped film is manufactured according to the method described in Japanese Patent Application Laid-Open No. 2013-524288. Specifically, the surface of a polymethyl methacrylate (PMMA) film is coated with a paint (Finecure RM-64 manufactured by Sanyo Chemical Industries, Ltd.), an optical pattern is embossed on the film surface including the paint, and then the paint is cured, thereby manufacturing the target uneven shaped film. The total thickness of the uneven shaped film is 130 μm.

[0091] The light guide component 30 is formed of a known material having a high visible light transmittance. The light guide component 30 is formed of, for example, an acrylic resin such as polymethyl methacrylate (PMMA), a polycarbonate (PC) resin, a cycloolefin resin, or glass (e.g., soda glass, quartz glass, non-alkali glass, borosilicate glass). The refractive index nGP of the light guide component 30 is, for example, 1.40 or more and 1.80 or less. It should be noted that, unless otherwise specified, the refractive index is the refractive index measured with an ellipsometer at a wavelength of 550 nm. The thickness of the light guide component 30 can be appropriately set according to the use. The thickness of the light guide component 30 is, for example, 0.05 mm or more and 50 mm or less.

[0092] The thickness of the base material layer 62 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 material layer 62 is preferably 1.40 or more and 1.70 or less, and more preferably 1.43 or more and 1.65 or less, independently of each other.

[0093] The thickness of each of the adhesive layer 34 and the pressure-sensitive adhesive layer 61 is, for example, 0.1 μm or more and 100 μm or less, preferably 0.3 μm or more and 100 μm or less, and more preferably 0.5 μm or more and 50 μm or less. The refractive index of each of the adhesive layer 34 and the pressure-sensitive adhesive layer 61 is preferably 1.42 or more and 1.60 or less, and more preferably 1.47 or more and 1.58 or less. In addition, the refractive index of each of the adhesive layer 34 and the pressure-sensitive adhesive layer 61 is preferably close to the refractive index of the light guide member 30, the first light extraction layer 40, or the second light extraction layer 50 with which they are in contact, and the absolute value of the difference in refractive index is preferably 0.2 or less.

[0094] The adhesive layer 34 and the pressure-sensitive adhesive layer 61 are each preferably capable of bonding without filling the recesses on the surfaces of the first light extraction layer 40 and the second light extraction layer 50. As an adhesive suitable for forming each of the adhesive layer 34 and the pressure-sensitive adhesive layer 61, the adhesives described in the applicant's International Application PCT / JP2021 / 006452, International Application PCT / JP2021 / 006453, or Japanese Patent Application No. 2021-025496 can be appropriately used. The entire disclosure of these applications is incorporated herein by reference. Particularly preferred is the polyester-based adhesive described in Japanese Patent Application No. 2021-025496.

[0095] The preferred embodiments have been described in detail above, but are not limited to the above embodiments, and various modifications and substitutions can be made to the above embodiments without departing from the scope described in the claims.

[0096] The lighting device of the present embodiment can emit light from two emission surfaces facing in opposite directions to each other. The lighting device of the present embodiment can provide a new use.

[0097] The embodiments of the present invention are as follows, for example.

[0098] <1>An optical component having: a light guide component having an incident surface for light from a light source, a first emission surface, and a second emission surface different from the first emission surface; a first light extraction portion disposed in a first region of the light guide component to cause the light guided inside the light guide component to be emitted from the first emission surface; and a second light extraction portion disposed, when viewed in the thickness direction of the light guide component, in a second region of the light guide component that does not overlap with the first region to cause the light guided inside the light guide component to be emitted from the second emission surface.

[0099] <2>The optical component according to <1>, wherein the first light extraction portion is a first light extraction layer provided on the light guide component, and the second light extraction portion is a second light extraction layer provided on the light guide component.

[0100] <3>The optical component according to <2>, wherein the first light extraction layer and the second light extraction layer are disposed on the same side surface of the light guide component.

[0101] <4>The optical component according to <3>, wherein the thickness of the first light extraction layer is the same as the thickness of the second light extraction layer.

[0102] <5>The optical component according to any one of <1> to <4>, wherein the first light extraction portion and the second light extraction portion each have an orientation control structure having a plurality of voids, and the plurality of voids each have: a first inclined surface that totally reflects a part of the light guided inside the light guide component; and a second inclined surface located on the side opposite to the first inclined surface in the void.

[0103] <6>The optical component according to any one of <1> to <5>, wherein the angle formed by the optical axis of the light emitted from the first emission surface of the light guide component and the normal line of the first emission surface is 0° or more and less than 50°, and the angle formed by the optical axis of the light emitted from the second emission surface of the light guide component and the normal line of the second emission surface is 0° or more and less than 50°.

[0104] <7>The optical component according to <6>, wherein the first light extraction part and the second light extraction part each have an alignment control structure having a plurality of voids, and each of the plurality of voids has: a first inclined surface that totally reflects a part of the light guided inside the light guide component; and a second inclined surface that is located on the side opposite to the first inclined surface in the void, and the angle of the first inclined surface with respect to the first emission surface and the second emission surface is respectively 10° or more and 70° or less, and the angle of the second inclined surface with respect to the first emission surface and the second emission surface is respectively 50° or more and 100° or less.

[0105] <8>The optical component according to any one of <1> to <7>, wherein the transmittance of the light guide component with respect to visible light, i.e., the total light transmittance, is 60% or more.

[0106] <9>The optical component according to any one of <1> to <7>, wherein the haze value of the light guide component is less than 30%.

[0107] <10>A lighting device having: a light source; and the optical component according to any one of <1> to <9>.

[0108] This application claims the priority based on Japanese Patent Application No. 2022-179771 filed with the Japan Patent Office on November 9, 2022, and includes all the contents of this Japanese patent application.

[0109] Explanation of reference numerals

[0110] 10 Light source

[0111] 20, 20a, 20b, 20c, 20d Optical components

[0112] 30 Light guide component

[0113] 31 Incident surface

[0114] 32 First emission surface

[0115] 33 Second emission surface

[0116] 34 Adhesive layer

[0117] 40 First light extraction layer (an example of the first light extraction part)

[0118] 50 Second light extraction layer (an example of the second light extraction part)

[0119] 61 Adhesive layer

[0120] 62 Substrate layer

[0121] 70 Diffusion point component (an example of the first light extraction part)

[0122] 80 Diffusion sheet component (an example of the first light extraction part)

[0123] 100, 100a, 100b, 100c, 100d Lighting device

[0124] 101 First region

[0125] 102 Second region

[0126] 200 Gap

[0127] 201 First inclined surface

[0128] 202 Second inclined surface

[0129] 210 Reference plane

[0130] 320 First normal

[0131] 330 Second normal

[0132] L, L1 Light

[0133] L2 Leakage light

[0134] La First emitted light

[0135] La0 First optical axis

[0136] Lb0 Second optical axis

[0137] Lb Second emitted light

[0138] Fr Fresnel reflected light

[0139] θa First inclination angle

[0140] θb Second inclination angle

[0141] φa First emission angle

[0142] φb Second emission angle

Claims

1. An optical component, characterized in that, it has: a light guide component having an incident surface for light from a light source, a first emission surface, and a second emission surface different from the first emission surface; a first light extraction portion disposed in a first region of the light guide component, causing the light guided inside the light guide component to be emitted from the first emission surface; a second light extraction portion, when viewed in the thickness direction of the light guide component, disposed in a second region of the light guide component that does not overlap with the first region, causing the light guided inside the light guide component to be emitted from the second emission surface.

2. The optical component according to claim 1, characterized in that, the first light extraction portion is a first light extraction layer provided on the light guide component, the second light extraction portion is a second light extraction layer provided on the light guide component.

3. The optical component according to claim 2, characterized in that, the first light extraction layer and the second light extraction layer are disposed on the same side surface of the light guide component.

4. The optical component according to claim 3, characterized in that, the thickness of the first light extraction layer is the same as the thickness of the second light extraction layer.

5. The optical component according to claim 1 or claim 2, characterized in that, the first light extraction portion and the second light extraction portion respectively have an orientation control structure having a plurality of voids, each of the plurality of voids has: a first inclined surface that totally reflects a part of the light guided inside the light guide component; a second inclined surface located on the side of the void opposite to the first inclined surface.

6. The optical component according to claim 1 or claim 2, characterized in that, the angle formed by the optical axis of the light emitted from the first emission surface of the light guide component and the normal line of the first emission surface is 0° or more and less than 50°, the angle formed by the optical axis of the light emitted from the second emission surface of the light guide component and the normal line of the second emission surface is 0° or more and less than 50°.

7. The optical component according to claim 6, characterized in that, the first light extraction portion and the second light extraction portion respectively have an orientation control structure having a plurality of voids, each of the plurality of voids has: a first inclined surface that totally reflects a part of the light guided inside the light guide component; a second inclined surface located on the side of the void opposite to the first inclined surface, the angle of the first inclined surface with respect to the first emission surface and the second emission surface is respectively 10° or more and 70° or less, the angle of the second inclined surface with respect to the first emission surface and the second emission surface is respectively 50° or more and 100° or less.

8. The optical component according to claim 1 or 2, characterized in that, the transmittance with respect to visible light, i.e., the total light transmittance, is 60% or more.

9. The optical component according to claim 1 or 2, characterized in that, the haze value is less than 30%.

10. A lighting device having: a light source; the optical component according to claim 1 or claim 2.

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