Lighting device

Abstract

To provide a lighting device that can improve the transmittance and the light extraction efficiency.SOLUTION: A lighting device includes: a light source; a surface layer provided at a position facing the light source; and a first reflective member provided between the light source and the surface layer to reflect light emitted from the light source toward the light source. The surface layer has a semi-transmissive layer and a plurality of first openings formed in the semi-transmissive layer. The first reflective member has a plurality of second openings formed in the back surface of the surface layer.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a lighting device. [Background technology]

[0002] Conventionally, there is known an illumination device that illuminates a veneer to make characters or patterns visible (for example, Patent Document 1). In Patent Document 1, a surface layer is disposed to cover an LED light source. The characters or patterns formed by the light emitted from the LED light source can be seen through the veneer. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-101781 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the lighting device of Patent Document 1, the light source is covered with a display layer of veneer, which may result in low transmittance.

[0005] An object of the present disclosure is to provide a lighting device that can improve transmittance and light extraction efficiency. [Means for solving the problem]

[0006] An illumination device according to one embodiment of the present disclosure includes a light source, a surface layer disposed opposite the light source, and a first reflecting member disposed between the light source and the counter plate for reflecting light emitted from the light source toward the light source, wherein the surface layer has a semi-transparent layer and a plurality of first openings disposed in the semi-transparent layer, and the reflecting member has a plurality of second openings disposed on a back surface of the surface layer. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a schematic plan view of the lighting device according to the first embodiment. [Figure 2] FIG. 2 is a schematic overall view of the lighting device according to the first embodiment. [Figure 3] FIG. 3 is a schematic partial cross-sectional view of the surface layer and the first reflecting member according to the first embodiment. [Figure 4] FIG. 4 is a schematic partial cross-sectional view of a surface layer and a first reflecting member according to a modified example of the first embodiment. [Figure 5] FIG. 5 is a schematic overall view of an illumination device according to a comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0008] Modes for carrying out the invention (embodiments) will be described in detail with reference to the drawings. The present disclosure is not limited to the contents described in the following embodiments. Furthermore, the components described below include those that can be easily imagined by a person skilled in the art and those that are substantially identical. Furthermore, the components described below can be combined as appropriate. Note that the disclosure is merely an example, and any appropriate modifications that a person skilled in the art can easily conceive while maintaining the gist of the invention are naturally included within the scope of the present disclosure. Furthermore, for clarity of explanation, the drawings may show the width, thickness, shape, etc. of each part schematically compared to the actual embodiment. However, these are merely examples and are not intended to limit the interpretation of the present disclosure. Furthermore, in this specification and each figure, elements similar to those previously described with reference to the preceding figures may be designated by the same reference numerals, and detailed descriptions may be omitted as appropriate.

[0009] In this specification and claims, when expressing an aspect of placing another structure on top of a certain structure, the term "on top" is used, unless otherwise specified, to include both a case in which another structure is placed directly on top of a certain structure so as to be in contact with the certain structure, and a case in which another structure is placed above a certain structure via yet another structure.

[0010] (Embodiment 1) 1 is a schematic plan view of an illumination device according to Embodiment 1. As shown in FIG. 1, the illumination device 1 according to this embodiment includes a light source 2, a surface layer 5, and a first reflecting member 6.

[0011] The light source 2 is provided on the back surface of the surface layer 5 via an air gap in a plan view, and the light source 2 that irradiates light toward the surface layer 5 is, for example, an LED (Light Emitting Diode), but is not limited to this and may be another configuration that functions in a similar manner, for example, an organic light emitting diode (OLED: Organic Light Emitting Diode).

[0012] The surface layer 5 is, for example, a veneer or plywood made of wood, or a veneer made of wood chips, and the surface of the surface layer 5 has, for example, a wood grain pattern. In the case of wood, it can be selected from, but is not limited to, sycamore, maple, cherry, or walnut. The thickness of the surface layer 5 is 0.2 mm to 0.5 mm.

[0013] In plan view, the surface layer 5 has a semi-transmitting layer 51 and a plurality of first openings OP1 provided in the semi-transmitting layer 51. The semi-transmitting layer 51 refers to a layer having a light transmittance of 1 to 50%, and for example, the light transmittance of the first embodiment is approximately 3.5%.

[0014] Hereinafter, one direction parallel to the surface of the surface layer 5 will be referred to as the first direction Dx, and the other direction parallel to the surface will be referred to as the second direction Dy. The first direction Dx is perpendicular to the second direction Dy, but may intersect with the second direction Dy without being perpendicular thereto. Furthermore, a direction perpendicular to the first direction Dx and the second direction Dy, i.e., a direction perpendicular to the surface of the surface layer 5, will be referred to as the third direction Dz. The third direction Dz corresponds to, for example, the normal direction of the light source 2. Hereinafter, a planar view refers to a positional relationship when viewed from the third direction Dz.

[0015] The first openings OP1 are openings (holes) that penetrate from the surface in the direction Dz2 to the surface in the direction Dz1 of the surface layer 5. The openings OP1 are arranged at predetermined intervals along the first direction Dx and the second direction Dy.

[0016] In this embodiment, the plurality of openings OP are circular in plan view. Note that the shape of the plurality of first openings OP1 shown in Fig. 1 is merely an example and can be changed as appropriate. The plurality of first openings OP1 may be polygonal or square in plan view.

[0017] By providing the first opening OP1 on the surface of the surface layer 5, the light transmittance can be improved.

[0018] In this embodiment, the plurality of openings OP are arranged in a square lattice pattern in plan view. Note that the arrangement, number, etc. of the plurality of openings OP shown in Fig. 1 are merely examples and can be changed as appropriate. The plurality of openings OP may be arranged in either a rhombic lattice pattern or a rectangular lattice pattern in plan view.

[0019] The first reflecting member 6 is disposed at a position where it overlaps the light source 2 in a plan view. The first reflecting member 4 is a film-like member made of, for example, aluminum or silver.

[0020] Fig. 2 is a schematic overall view of the lighting device according to embodiment 1. As shown in Fig. 2, the surface layer 5 is provided at a position facing the light source.

[0021] The first reflecting member 6 is provided between the light source 2 and the surface layer 5. The first reflecting member 6 has a plurality of second openings OP2. The surface layer 5 and the first reflecting member 6 may be joined with an adhesive or the like, or there may be an air gap between them.

[0022] Light L1 irradiated from the light source 2 toward the surface layer 5 in the third direction Dz passes through the second opening OP2 of the first reflecting member 6 and the first opening OP1 of the surface layer 5 and is diffused to the outside as diffused light L3.

[0023] The first reflecting member 6 reflects a portion of the light L1 as reflected light L2 toward the light source 2 in the third direction Dz. That is, the light absorbed by the surface layer 5 is reflected by the first reflecting member 6. The first reflecting member 6 has a higher light reflectance than the surface layer 5.

[0024] This makes it possible to improve the light extraction efficiency.

[0025] The lighting device 1 further includes a second reflecting member 21. The second reflecting member 21 is located on the opposite side to the direction in which the light source 3 irradiates light toward the surface layer 5 side.

[0026] A second reflecting member 21 is further provided at a position where the light source 2 is sandwiched between the second reflecting member 21 and the first reflecting member 6. The material of the second reflecting member 21 is the same as that of the first reflecting member 6. The second reflecting member 21 further reflects the reflected light L2 toward the surface layer 5 in the third direction Dz.

[0027] The light reflected by the second reflecting member 21 is reused as the diffused light L3, which further improves the light extraction efficiency.

[0028] When the light source 2 is not irradiating the surface layer 5 with light, only the surface of the surface layer 5 is visible to the user when the lighting device 1 is viewed from above.

[0029] 3 is a schematic partial cross-sectional view of the surface layer and the first reflecting member according to embodiment 1. As shown in FIG. 3, the first opening OP1 overlaps with the second opening OP2 when viewed in the third direction Dz. Note that the second opening OP2 may be larger than the first opening OP1.

[0030] This allows the light that has passed through the second opening to easily pass through the first opening, improving the transmittance.

[0031] (Modification of the first embodiment) 4 is a schematic overall view of an illumination device according to a modified example of embodiment 1. In the following description, the same components as those described in the above embodiment are denoted by the same reference numerals, and redundant description will be omitted.

[0032] Fig. 4 is a schematic partial cross-sectional view of a surface layer and a first reflecting member according to a modification of Embodiment 1. As shown in Fig. 4, the first reflecting member 6 has a second opening OP2 at a position overlapping with the first opening OP1 and the semi-transmitting layer 51 when viewed in the third direction Dz.

[0033] In the lighting device 1A according to the modification of the first embodiment, the light L1 emitted from the light source 2 includes a first light L11 and a second light L12. The first light L11 is light that passes through the second opening OP2 and then the first opening OP1. The second light L12 is light that passes through the second opening OP2 and then the semi-transmitting layer 51.

[0034] The light L1 that has passed through the second opening OP2 passes through the first opening OP1 and the semi-transmitting layer 51 and is diffused to the outside as diffused light L3. This improves the transmittance compared to a lighting device 1a according to a comparative example that does not have the first opening OP1, which will be described later with reference to FIG.

[0035] (Comparative Example) 5 is a schematic overall view of an illumination device according to a comparative example. In the following description, the same components as those described in the above embodiment are denoted by the same reference numerals, and duplicated description will be omitted.

[0036] 5, the illumination device 1a according to the comparative example is different from the illumination device 1 according to the first embodiment in that the illumination device 1a does not have a plurality of openings OP1 on the surface of the surface layer 5a. In addition, the first reflecting member 6 is not provided between the light source 2 and the surface layer 5a. Furthermore, the second reflecting member 21 is not provided on the side opposite to the direction in which the light source 3 irradiates light toward the surface layer 5a.

[0037] In the lighting device 1a, the reflectance of the surface layer 5 is 10% or more and 15% or less, resulting in low transmittance, which makes the lighting device 1a dark overall.

[0038] In contrast, the lighting device 1 of the first embodiment has a reflectance of 20% to 30%, both inclusive, and a high transmittance, which makes the illumination of the lighting device 1 brighter overall. [Explanation of symbols]

[0039] 1, 1A, 1a lighting device 2 light source 21 Second reflecting member 5 Surface layer 51 Semi-transparent layer OP1 1st opening OP2 Second opening 6 First reflecting member

Claims

1. A light source and a surface layer provided at a position facing the light source; a first reflecting member provided between the light source and the surface layer and configured to reflect light from the light source toward the light source; Equipped with the surface layer has a semi-transparent layer and a plurality of first openings provided in the semi-transparent layer; the first reflecting member has a plurality of second openings; Lighting equipment.

2. Further provided is a second reflecting member disposed at a position where the light source is sandwiched between the second reflecting member and the first reflecting member. The lighting device according to claim 1 .

3. The first opening overlaps with the second opening.

3. The lighting device according to claim 2.

4. the first reflecting member has the second opening at a position overlapping the first opening and the semi-transmitting layer; 3. The lighting device according to claim 2.

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