Lighting System

Abstract

The present invention addresses the problem of providing light-distribution-controlled illumination light in a space to be illuminated, and to doing so without using a lighting device. A lighting system (100) comprises: a light source unit (1); and a light distribution unit (5). The light source unit (1) includes a laser light source (2). The light distribution unit (5) is separated from the light source unit (1), and converts incident light (L1), which is emitted in the form of a beam from the light source unit (1) toward a space to be illuminated (S1), into illumination light (L2), and distributes the same in the space to be illuminated (S1). The light distribution unit (5) includes: a reflection part (6) that reflects the incident light (L1) towards the space to be illuminated (S1); and a diffusion part (7) that diffuses the incident light (L1) towards the space to be illuminated (S1).

Description

[Technical field]

[0001] The present disclosure relates generally to lighting systems, and more particularly to lighting systems that provide illumination light to a target space. [Background technology]

[0002] Patent Document 1 describes a lighting system that includes a lighting device (lighting fixture) that illuminates a part of a room.

[0003] The lighting device is installed, for example, on a ceiling inside a building, and includes a housing and a light-emitting module.

[0004] The lighting system described in Patent Document 1 requires that a lighting fixture be installed on the ceiling of a room in order to provide illumination light with light distribution control in the room (target space). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2020-161347 A Summary of the Invention

[0006] An object of the present disclosure is to provide a lighting system capable of providing illumination light with light distribution control to a target space without using a lighting fixture.

[0007] A lighting system according to an aspect of the present disclosure includes a light source unit and a plurality of light distribution sections. The light source unit includes a laser light source. Each of the plurality of light distribution sections is separated from the light source unit, and converts incident light, which is a beam-like light emitted from the light source unit into a target space, into illumination light and distributes the light to the target space. Each of the plurality of light distribution sections includes a reflecting section that reflects the incident light toward the target space, and a diffusing section that diffuses the incident light toward the target space. The reflecting section has a reflecting surface that reflects the incident light and a main surface opposite to the reflecting surface, and the reflecting surface is inclined with respect to the main surface when viewed from a direction perpendicular to the traveling direction of the incident light. The plurality of light distribution sections include a first light distribution section and a second light distribution section. The first light distribution section and the second light distribution section have different orientations of the reflecting surfaces of the respective reflecting sections. A lighting system according to an aspect of the present disclosure includes a light source unit and a light distribution unit. The light source unit includes a laser light source. The light distribution unit is separated from the light source unit, and converts incident light, which is a beam-like light emitted from the light source unit into a target space, into illumination light and distributes the light to the target space. The light distribution unit has a reflecting unit that reflects the incident light toward the target space, and a diffusing unit that diffuses the incident light toward the target space. The reflecting unit has a reflecting surface that reflects the incident light and a main surface opposite to the reflecting surface, and the reflecting surface is inclined with respect to the main surface when viewed from a direction perpendicular to the traveling direction of the incident light. The diffusing unit is configured to make the light distribution angle of the illumination light when viewed from a first direction that is a direction perpendicular to the traveling direction of the incident light different from the light distribution angle of the illumination light when viewed from a second direction perpendicular to the first direction. A lighting system according to an aspect of the present disclosure includes a light source unit and a plurality of light distribution sections. The light source unit includes a laser light source. Each of the plurality of light distribution sections is separated from the light source unit, and converts incident light, which is a beam-like light emitted from the light source unit into a target space, into illumination light and distributes the light to the target space. The light distribution section includes a reflecting section that reflects the incident light toward the target space, and a diffusing section that diffuses the incident light toward the target space. The reflecting section has a reflecting surface that reflects the incident light and a main surface opposite to the reflecting surface, and the reflecting surface is inclined with respect to the main surface when viewed from a direction perpendicular to the traveling direction of the incident light. The plurality of light distribution sections include a first light distribution section and a second light distribution section. When viewed from a direction perpendicular to the traveling direction of the incident light, a light distribution angle of the illumination light by the first diffusing section that is the diffusing section of the first light distribution section and a light distribution angle of the illumination light by the second diffusing section that is the diffusing section of the second light distribution section are different. A lighting system according to an aspect of the present disclosure includes a light source unit, a light distribution section, a resin layer, and an anti-reflection layer. The light source unit includes a laser light source. The light distribution section is separated from the light source unit, and converts incident light, which is a beam-like light emitted from the light source unit into a target space, into illumination light and distributes the light to the target space. The resin layer covers the light distribution section and has translucency. The light distribution section has a reflecting section that reflects the incident light toward the target space, and a diffusing section that diffuses the incident light toward the target space. The reflecting section has a reflecting surface that reflects the incident light and a main surface opposite to the reflecting surface, and the reflecting surface is inclined with respect to the main surface when viewed from a direction perpendicular to the traveling direction of the incident light. The resin layer has a main surface opposite to the light distribution section side. The main surface of the resin layer is parallel to the main surface of the reflecting section. The anti-reflection layer covers the main surface of the resin layer opposite to the light distribution section side. 。 [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a configuration diagram of a lighting system according to the first embodiment. [Diagram 2]FIG. 2 is a configuration diagram of a light source unit in the above lighting system. [Diagram 3] FIG. 3 is a configuration diagram of a projection section of a light source unit in the above lighting system. [Figure 4] Fig. 4A is a cross-sectional view of a light distribution unit in the lighting system of the above, Fig. 4B is a front view of a diffusion unit of the light distribution unit in the lighting system of the above, and Fig. 4C is a cross-sectional view taken along line XX in Fig. 4B. [Diagram 5] FIG. 5 is a configuration diagram of a light source unit in a lighting system according to a first modification of the first embodiment. [Figure 6] FIG. 6 is a configuration diagram of a projection section of a light source unit in the above lighting system. [Figure 7] FIG. 7 is a configuration diagram of a light source unit in a lighting system according to a second modification of the first embodiment. [Figure 8] FIG. 8 is a cross-sectional view of a light distribution section in a lighting system according to the second embodiment. [Figure 9] FIG. 9 is a cross-sectional view of a light distribution section in a lighting system according to the third embodiment. [Figure 10] FIG. 10 is an explanatory diagram of the distribution of illumination light by the above-mentioned lighting system. [Figure 11] FIG. 11 is an explanatory diagram of the distribution of illumination light by a lighting system according to a modified example of the third embodiment. [Figure 12] FIG. 12 is a cross-sectional view of a light distribution section in a lighting system according to the fourth embodiment. [Figure 13] Fig. 13A is a front view of a diffusion section in a lighting system according to embodiment 5. Fig. 13B is a cross-sectional view taken along line XX in Fig. 13A. Fig. 13C is a cross-sectional view taken along line YY in Fig. 13A. [Figure 14] FIG. 14 is a cross-sectional view of a light distribution section in a lighting system according to the sixth embodiment. [Figure 15] FIG. 15 is a cross-sectional view of a light distribution section in a lighting system according to the seventh embodiment. [Figure 16] FIG. 16 is a cross-sectional view of a light distribution section in a lighting system according to the eighth embodiment. [Figure 17] FIG. 17 is a cross-sectional view of a light distribution section in a lighting system according to the ninth embodiment. [Figure 18] FIG. 18 is a cross-sectional view of a light distribution section in a lighting system according to the tenth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The drawings described in the following embodiments 1 to 10 are schematic drawings, and the ratios of sizes and thicknesses of the components in the drawings do not necessarily reflect the actual dimensional ratios.

[0010] (Embodiment 1) Hereinafter, a lighting system 100 according to a first embodiment will be described with reference to FIGS. 1, 2, 3, 4A, 4B, and 4C.

[0011] (1) Overview The lighting system 100 is used, for example, to illuminate a target space S1 in a facility. The facility is, for example, an office building. The facility may be, for example, a detached house, an apartment building, a store, a museum, a hotel, a factory, a stadium, an airport, etc.

[0012] 1, the lighting system 100 includes a light source unit 1 and a light distribution section 5. The lighting system 100 causes a beam of light (e.g., a beam of white light Lw) emitted from the light source unit 1 to enter the light distribution section 5 as incident light L1, and the incident light L1 is converted by the light distribution section 5 into illumination light L2 and output.

[0013] The light source unit 1 includes a laser light source 2. The light distribution section 5 is separated from the light source unit 1. The light distribution section 5 converts the incident light L1, which is a beam-shaped light emitted from the light source unit 1 to the target space S1, into illumination light L2 and distributes the light to the target space S1. The light distribution characteristic of the illumination light L2 is different from the light distribution characteristic of the incident light L1. The light distribution section 5 has a reflecting section 6 that reflects the incident light L1 toward the target space S1 and a diffusing section 7 that diffuses the incident light L1 toward the target space S1. In the lighting system 100, the light distribution section 5 is a building material 11 (hereinafter also referred to as the first building material 11). The first building material 11 forms a part of a structure ST1 (hereinafter also referred to as the first structure ST1) facing the target space S1. "Facing the target space S1" means being in contact with the target space S1. The first structure ST1 including the first construction material 11 is in contact with the target space S1 and defines the boundary between the target space S1 and the attic. The first structure ST1 is a ceiling in a facility. The target space S1 is a space below the ceiling.

[0014] In the lighting system 100, the light source unit 1 includes an optical fiber 3 into which light (eg, blue light Lb) from a laser light source 2 is incident, as shown in FIGS.

[0015] (2) Lighting system configuration The lighting system 100 includes the light source unit 1 and the light distribution section 5, as described above.

[0016] (2.1) Light source unit The light source unit 1 includes a laser light source 2 as shown in Figs. 1 and 2. The laser light source 2 is, for example, a semiconductor laser that emits blue light Lb (laser light). As a result, the blue light Lb is emitted from the laser light source 2. The semiconductor laser is, for example, a GaN-based semiconductor laser. The peak wavelength of the laser light is, for example, in the range of 440 nm to 480 nm. The light source unit 1 includes, for example, two laser light sources 2 as shown in Fig. 2.

[0017] The light source unit 1 further includes an optical fiber 3 and a projection unit 4 .

[0018] In the light source unit 1, as shown in Fig. 2, blue light Lb emitted from two laser light sources 2 is incident on one optical fiber 3. The blue light Lb that is incident on the optical fiber 3, propagates through the optical fiber 3, and is emitted from the optical fiber 3 is incident on the projection unit 4 as shown in Fig. 3. The projection unit 4 converts the blue light Lb from the laser light sources 2 into white light Lw and projects it into the target space S1 (see Fig. 1). The white light Lw projected from the projection unit 4 is incident on the light distribution unit 5 as incident light L1 (see Fig. 1).

[0019] The light source unit 1 further includes two mirrors 25 corresponding one-to-one to the two laser light sources 2, a condenser lens 26, and a housing 28. The housing 28 houses the two laser light sources 2, the two mirrors 25, and the condenser lens 26. The two mirrors 25 reflect the blue light Lb from the corresponding one of the two laser light sources 2 toward the condenser lens 26. The condenser lens 26 is disposed between the two mirrors 25 and the optical fiber 3, and causes the blue light Lb reflected by each of the two mirrors 25 to enter one optical fiber 3. That is, the two laser light sources 2 and the optical fiber 3 are optically coupled by the two mirrors 25 and the condenser lens 26.

[0020] The housing 28 is disposed at a position away from the first building material 11 as shown in FIG. 1. More specifically, the light source unit 1 is disposed outside the projection area A11 of the first building material 11 as viewed from the target space S1. For example, the housing 28 is disposed on the floor surface F1 on the back side of the second building material 12. The second building material 12 forms at least a part of the second structure ST2 that partitions the target space S1 together with the first structure ST1. In the first building material 11, the projection area A11 of the first building material 11 as viewed from the target space S1 is a projection area (vertical projection area) of the first building material 11 as viewed from the target space S1 in the thickness direction of the panel-shaped building material main body 110 in the first building material 11. In short, the projection area A11 is a projection area along the thickness direction of the building material main body 110. The building material main body 110 has a lower surface 111 and an upper surface 112 (see FIG. 4A).

[0021] The second building material 12 forms at least a part of the second structure ST2 facing the target space S1. "Facing the target space S1" means being in contact with the target space S1. The second structure ST2 including the second building material 12 is in contact with the target space S1 and partitions the target space S1. The second structure ST2 is a wall within a facility (see FIG. 1). The second building material 12 is panel-shaped. The second building material 12 is rectangular when viewed from the thickness direction of the second building material 12, but is not limited to this and may be square. In this specification, "when viewed from the thickness direction of the second building material 12" means, for example, viewing the second building material 12 from the target space S1 in the thickness direction of the second building material 12, and does not mean viewing from the opposite side to the target space S1 side in the thickness direction of the second building material 12.

[0022] The optical fiber 3 has a core, a clad, and a coating portion. The clad covers the outer peripheral surface (side surface) of the core. The coating portion covers the outer peripheral surface (side surface) of the clad. The core has a first end face and a second end face opposite to the first end face. The core has a circular cross-sectional shape perpendicular to the optical axis direction. The clad is arranged coaxially with the core. The material of the core is a light-transmitting material. The light-transmitting material is, for example, any one of a fluoride, an oxide, or a nitride. The fluoride is, for example, a fluoride glass. The oxide is, for example, silicon oxide, quartz, or the like. The refractive index of the clad is smaller than that of the core. The coating portion covers the outer peripheral surface of the clad. The material of the coating portion is, for example, a resin.

[0023] The optical fiber 3 has a core diameter of, for example, 20 μm to 1000 μm. The optical fiber 3 has a length of, for example, 1 m to 100 m. If the core diameter of the optical fiber 3 is less than 20 μm, it becomes difficult to efficiently couple the light of the laser light source 2 to the optical fiber 3. If the core diameter of the optical fiber 3 exceeds 1000 μm, it becomes difficult to bend the optical fiber 3 with a small bending radius, and handling restrictions become greater.

[0024] The optical fiber 3 has a first end 31 (see FIG. 2) in the length direction, and a second end 32 (see FIG. 3) opposite the first end 31. The first end 31 of the optical fiber 3 includes an incident end face (first end face of the core) into which light from the laser light source 2 is incident. The second end 32 of the optical fiber 3 includes an exit end face (second end face of the core) from which light that is incident from the incident end face and propagates through the optical fiber 3 exits.

[0025] The projection unit 4 is disposed on the opposite side of the second building material 12 to the target space S1. The projection unit 4 may be disposed on the second building material 12. The second building material 12 has a window 121 that passes light from the projection unit 4. The window 121 is an opening, but is not limited to this and may be a light-transmitting member.

[0026] The projection unit 4 is disposed at a position on the second building material 12 that is higher than a height position from the floor surface F1 that is a predetermined height (for example, 2 m 30 cm). The predetermined height is a height that is determined so that the projection unit 4 is positioned at a position higher than the height from the floor surface F1 to the top of the head of the person 19. The projection unit 4 is disposed so that the incident light L1 propagates upward (i.e., diagonally upward) rather than downward from the horizontal direction.

[0027] 3, the projection unit 4 has a wavelength conversion unit 40, a collimator lens 41, and a housing 48. The wavelength conversion unit 40 has a function of converting blue light Lb into white light Lw that includes light having a wavelength different from that of the blue light Lb.

[0028] The blue light Lb emitted from the optical fiber 3 is incident on the wavelength conversion section 40 of the projection section 4. The wavelength conversion section 40 includes, for example, a light-transmitting material section and phosphor particles. In this case, the wavelength conversion section 40 is formed of a mixture of the light-transmitting material section and the phosphor particles. In the wavelength conversion section 40, a large number of phosphor particles are present in the light-transmitting material section. The material of the light-transmitting material section (light-transmitting material) is preferably a material with high transmittance for visible light. The light-transmitting material is, for example, a silicone-based resin. This makes it possible to improve the heat resistance and weather resistance of the wavelength conversion section 40 in the projection section 4. The "silicone-based resin" is, for example, a silicone resin, a modified silicone resin, etc. The wavelength conversion section 40 has phosphor particles as a wavelength conversion element. The wavelength conversion element converts the wavelength of a part of the blue light Lb and emits light of a wavelength different from the wavelength of the blue light Lb. For example, yellow phosphor particles that emit yellow light can be used as the phosphor particles. The light (fluorescence) emitted from the yellow phosphor particles preferably has an emission spectrum with a main emission peak wavelength in the wavelength range of 530 nm to 580 nm. The yellow phosphor particles are, for example, Y phosphor activated with Ce. 3 Al 5 O 12 However, the present invention is not limited to this.

[0029] The white light Lw emitted from the wavelength conversion unit 40 is a mixed light of blue light and yellow light. The white light Lw emitted from the wavelength conversion unit 40 is incoherent light. The wavelength conversion unit 40 is not limited to a case where it includes only yellow phosphor particles as a wavelength conversion element, but may include, for example, yellow phosphor particles, yellow-green phosphor particles, green phosphor particles, and red phosphor particles. In other words, the wavelength conversion unit 40 may include multiple types of phosphor particles.

[0030] The collimating lens 41 is located on the opposite side of the wavelength converting unit 40 to the second end 32 of the optical fiber 3. The collimating lens 41 collimates the white light Lw emitted from the wavelength converting unit 40.

[0031] The housing 48 contains the wavelength conversion unit 40 and the collimating lens 41. In the housing 48, at least the material of the portion 481 that passes the white light Lw collimated by the collimating lens 41 is a light-transmitting material. The light-transmitting material is, for example, a silicone resin. The light-transmitting material is not limited to silicone resin, and may be, for example, a fluorine-based resin, a low-melting point glass, a sol-gel glass, or the like. The light-transmitting material is preferably a material with high transmittance for visible light. In the housing 48, the portion 481 that passes the white light Lw collimated by the collimating lens 41 may be an opening.

[0032] When the second building material 12 is viewed by a person 19 in the target space S1, the light source unit 1 is hidden by the second building material 12. In other words, the light source unit 1 is shielded by the second building material 12.

[0033] (2.2) Light distribution section As shown in FIG. 1, the light distribution unit 5 is separated from the light source unit 1. The light distribution unit 5 converts incident light L1, which is a beam-like light emitted from the light source unit 1 to the target space S1, into illumination light L2 and distributes the light in the target space S1. The light distribution characteristic of the illumination light L2 is different from the light distribution characteristic of the incident light L1. Here, the illumination light L2 has a light distribution characteristic with a lower directivity than the incident light L1. In other words, the illumination light L2 has a larger luminous flux spread angle than the incident light L1. The illumination light L2 is light with relatively low coherence (incoherent light) compared to the incident light L1. However, the illumination light L2 has a light distribution characteristic with a smaller light distribution angle than the Lambertian light distribution characteristic.

[0034] As shown in FIGS. 1 and 4A, the light distribution section 5 has a reflecting section 6 that reflects the incident light L1 toward the target space S1, and a diffusing section 7 that diffuses the incident light L1 toward the target space S1.

[0035] As shown in FIG. 4A, the reflecting portion 6 has a reflecting surface 61 that reflects the incident light L1 and a main surface 62 opposite to the reflecting surface 61. The main surface 62 of the reflecting portion 6 is a surface parallel to a plane (reference plane) PL1 including the lower surface 111 of the building material body 110. From another perspective, the main surface 62 of the reflecting portion 6 is a horizontal surface. The reflecting portion 6 reflects the incident light L1 incident on the reflecting surface 61 at an incident angle φ1. In other words, the reflecting surface 61 reflects the incident light L1 incident at an incident angle φ1. The reflecting surface 61 is a mirror surface and regularly reflects the incident light L1. The incident angle φ1 is an angle between the incident light L1 and a normal H1 erected at the incident point of the incident light L1 on the reflecting surface 61. The reflection angle φ2 between the reflected light of the incident light L1 of the illumination light L2 and the normal H1 is the same angle as the incident angle φ1. The incident angle φ1 is, for example, 20 to 40 degrees, and as one example, is 30 degrees.

[0036] When viewed from a direction perpendicular to the traveling direction of the incident light L1, the reflection surface 61 is inclined with respect to the main surface 62. The reflection surface 61 is planar. The reflection portion 6 includes a protrusion 63 and a reflection layer 64 having the reflection surface 61. The protrusion 63 protrudes from the lower surface 111 of the building material body 110. The protrusion 63 has an inclined surface 631 inclined with respect to a plane PL1 including the lower surface 111 of the building material body 110. The protrusion 63 and the reflection layer 64 are quadrangular when viewed from the thickness direction of the building material body 110. The protrusion 63 is in the shape of a right triangle in a side view. In the protrusion 63, the inclined surface 631 of the protrusion 63 corresponds to the hypotenuse of the right triangle in a side view of the protrusion 63. The interior angle η1 between the inclined surface 631 and the plane PL1 is, for example, 20 to 40 degrees, and is, for example, 30 degrees. In the reflecting portion 6, the interior angle η2 between the inclined surface 631 of the protrusion 63 and the main surface 62 of the reflecting portion 6 is the same as the interior angle η1. The reflecting layer 64 overlaps the inclined surface 631 of the protrusion 63. The reflecting layer 64 has a first main surface on the protrusion 63 side and a second main surface on the opposite side to the protrusion 63 side. In the reflecting layer 64, the second main surface of the reflecting layer 64 forms the reflecting surface 61. The thickness of the reflecting layer 64 in the normal direction of the inclined surface 631 of the protrusion 63 is constant regardless of the position of the inclined surface 631. Here, "constant" is not limited to being strictly constant, and may be, for example, a thickness that is 90% to 110% of a predetermined thickness.

[0037] In the reflector 6, the interior angle θ between the reflecting surface 61 and the main surface 62 is the same as the incident angle φ1. This allows the reflected light of the incident light L1 on the reflecting surface 61 to travel vertically downward in the reflector 6. The interior angle θ is the same as the interior angle η1.

[0038] The material of the reflective layer 64 includes, for example, a metal, such as aluminum or an aluminum alloy.

[0039] The material of the protrusion 63 is, for example, the same material as the building material body 110. In the lighting system 100 according to the first embodiment, the protrusion 63 is, for example, integral with the building material body 110. The building material body 110 is, for example, a decorative plywood or a decorative board. The decorative plywood includes, for example, natural wood decorative plywood and specially processed decorative board. The specially processed decorative board includes, for example, synthetic resin decorative board, printed plywood, PVC decorative plywood, and paper / cloth overlay plywood. The decorative board includes, for example, MDF (medium density fiberboard), dielite, rock wool board, calcium silicate board, and insulation board. The building material body 110 has, for example, light blocking properties, non-combustibility, sound absorption properties, and heat insulation properties. It is preferable that the building material body 110 has at least light blocking properties and non-combustibility.

[0040] The material of the protrusion 63 in the reflecting portion 6 may be a material different from the material of the building material body 110. In this case, the protrusion 63 is a separate member from the building material body 110, and is fixed to the lower surface 111 of the building material body 110.

[0041] The diffusion unit 7 is, for example, a transmissive diffusion plate. The material of the diffusion unit 7 is, for example, polycarbonate, polyester, acrylic, glass, or quartz. The diffusion unit 7 has a main surface opposite to the reflecting unit 6 side. The main surface of the diffusion unit 7 has an uneven structure 710. The uneven structure 710 includes a plurality of curved surfaces 73 (see FIG. 4C) that are randomly formed. The diffusion unit 7 has a plurality of microlenses corresponding to the plurality of curved surfaces 73. Each of the plurality of curved surfaces 73 functions as a light emission surface of the microlens. Therefore, the diffusion unit 7 can be said to be a microlens array in which a plurality of microlenses are randomly integrated. The shape of the uneven structure 710 is determined based on a desired light distribution angle of the illumination light L2. The diffusion unit 7 diffuses the incident light L1 reflected by the reflecting unit 6 by the refraction and diffraction action of the uneven structure 710. The diffusion unit 7 is, for example, configured by a lens diffuser plate (LSD: Light Shaping Diffusers). In the light distribution section 5, the uneven structure 710 of the diffusion section 7 determines the light distribution angle of the illumination light L2.

[0042] The light distribution unit 5 is a first building material 11 that forms a part of a first structure ST1 facing the target space S1. The first building material 11 is a ceiling material. The light source unit 1 is disposed away from the first building material 11. Incident light L1 passes through the target space S1 and enters the light distribution unit 5. In the facility, as shown in FIG. 1, a table Ta1 is installed below the light distribution unit 5 on the floor surface F1, for example, to be used by a person 19 who uses the facility.

[0043] In a facility, for example, at least one first building material 11 and a plurality of ceiling materials 10 form a ceiling facing the target space S1.

[0044] The first building material 11 is arranged next to at least one of a plurality of ceiling materials 10 different from the first building material 11, but may be arranged next to a first building material 11 different from itself. The first building material 11 is panel-shaped. The first building material 11 is square-shaped when viewed from its thickness direction, like the ceiling material 10, but may be rectangular. In this specification, "viewed from the thickness direction of the first building material 11" means, for example, viewing the first building material 11 from the target space S1 in the thickness direction of the building material body 110 of the first building material 11, and does not mean viewing from the opposite side to the target space S1 side in the thickness direction of the building material body 110. The size of the building material body 110 is the same as that of the ceiling material 10, but may be different sizes. The first building material 11 is supported by a support member in the same manner as the ceiling material 10. The support member is formed, for example, using a plurality of zinc steel plates or the like. The ceiling material 10 is, for example, a decorative plywood or a decorative board.

[0045] (2.3) Other components of the lighting system The lighting system 100 may further include a power supply unit. The power supply unit supplies power to the two laser light sources 2 and the like. The power supply unit includes a drive circuit for driving the two laser light sources 2 and a control circuit for controlling the drive circuit. In the lighting system 100, the control circuit controls the drive circuit, thereby making it possible to adjust the optical output of the two laser light sources 2 and adjust the illuminance (brightness) of the illumination light L2. The power supply unit is housed in the housing 28 of the light source unit 1, but is not limited thereto and may not be housed in the housing 28. A power supply voltage is supplied to the power supply unit from an external power source via an electric wire.

[0046] (3) Lighting system operation The lighting system 100 emits blue light Lb from two laser light sources 2. As a result, in the lighting system 100, the blue light Lb from the two laser light sources 2 is incident on the optical fiber 3, propagates through the optical fiber 3, and is incident on the projection unit 4. The projection unit 4 converts the incident blue light Lb into white light Lw using the wavelength conversion unit 40, collimates it using the collimator lens 41, and projects it into the target space S1. The white light Lw projected from the projection unit 4 passes through the target space S1 and is incident on the light distribution unit 5 as incident light L1. The light distribution unit 5 reflects the incident light L1 and outputs illumination light L2 having a light distribution characteristic different from that of the incident light L1 to the target space S1. In the lighting system 100 according to the first embodiment, the light distribution characteristic of the illumination light L2 is, for example, a narrow angle light distribution characteristic similar to the light distribution characteristic of a lighting fixture such as a spotlight.

[0047] (4) Summary The lighting system 100 according to the first embodiment includes a light source unit 1 and a light distribution unit 5 that is separated from the light source unit 1 and converts incident light L1, which is a beam-like light emitted from the light source unit 1 to the target space S1, into illumination light L2 and distributes the light to the target space S1. The light distribution unit 5 has a reflecting unit 6 that reflects the incident light L1 toward the target space S1 and a diffusing unit 7 that diffuses the incident light L1 toward the target space S1. This allows the lighting system 100 according to the first embodiment to provide illumination light L2 with light distribution control to the target space S1 without using a lighting fixture. More specifically, the lighting system 100 according to the first embodiment can provide illumination light L2 with light distribution control to the target space S1 from the ceiling without installing a lighting fixture on the ceiling facing the target space S1. Therefore, the lighting system 100 according to the first embodiment has a high degree of freedom in setting an area in the target space S1 where the illumination light L2 with light distribution control is provided, and is easy to install. The lighting system 100 according to the first embodiment uses light with high directivity and high coherence (beam-shaped light suitable for long-distance spatial propagation) as the incident light L1. In the lighting system 100, the illumination light L2 converted and distributed by the light distribution unit 5 has relatively low directivity and coherence compared to the incident light L1, and is suitable for illumination. In addition, since the lighting system 100 uses the laser light source 2 as the light source, it is possible to increase the directivity of the incident light L1 and to place the light source farther away from the ceiling.

[0048] In addition, in the lighting system 100 according to the first embodiment, as described above, the light distribution unit 5 has the reflecting unit 6 that reflects (specularly reflects) the incident light L1 toward the target space S1 and the diffusing unit 7 that diffuses the incident light L1 toward the target space S1, so that the light distribution characteristic of the illumination light L2 can be made narrower than the Lambertian light distribution characteristic, and the light distribution angle of the illumination light L2 can be made smaller than the light distribution angle of the Lambertian light distribution characteristic. As a result, the lighting system 100 according to the first embodiment can make the light distribution angle of the illumination light L2 smaller than the light distribution angle of the Lambertian light distribution characteristic, enabling localized illumination similar to a lighting fixture such as a spotlight, and as a result, can efficiently and brightly illuminate the hands of a person 19 (see FIG. 1) working on a table Ta1 (see FIG. 1). In other words, the lighting system 100 can brightly illuminate a required area even with a small total luminous flux. Furthermore, the lighting system 100 according to the first embodiment makes it possible to realize a lighting design that makes it appear as if a lighting fixture such as a spotlight were present in a place (ceiling) where no lighting fixture actually exists.

[0049] Furthermore, in the lighting system 100 of embodiment 1, the light distribution section 5 is separated from the light source unit 1 including the laser light source 2 that requires power supply, and the light source unit 1 is disposed at a position away from the light distribution section 5 (first building material 11), thereby making it possible to improve the maintainability of the light source unit 1.

[0050] In the lighting system 100 according to the first embodiment, the reflecting unit 6 has a reflecting surface 61 that reflects the incident light L1 and a main surface 62 opposite to the reflecting surface 61. When viewed from a direction perpendicular to the traveling direction of the incident light L1, the reflecting surface 61 is inclined with respect to the main surface 62. As a result, in the lighting system 100 according to the first embodiment, it is possible to determine the optical axis direction of the illumination light L2 by the inclination of the reflecting surface 61 with respect to the main surface 62 of the reflecting unit 6. In other words, the lighting system 100 according to the first embodiment can provide illumination light L2 whose light distribution is controlled so as to have a light distribution characteristic with a smaller light distribution angle than the Lambertian light distribution characteristic centered on the direction of regular reflection of the incident light L1 on the reflecting surface 61. As an example, the lighting system 100 according to the first embodiment can set the traveling direction of the reflected light of the incident light L1 on the reflecting surface 61 vertically downward, and can set the optical axis direction of the illumination light L2 along the vertically downward direction.

[0051] (Modification 1 of the first embodiment) The lighting system 100 according to the first modification of the first embodiment includes a light source unit 1a (see FIG. 5) instead of the light source unit 1. The basic configuration of the lighting system 100 according to the first modification of the first embodiment is similar to that of the lighting system 100 according to the first embodiment, and therefore will not be illustrated or described.

[0052] The light source unit 1a includes an optical fiber 3a instead of the optical fiber 3 of the light source unit 1. The core of the optical fiber 3a includes a light-transmitting material and a wavelength converting element. The concentration of the wavelength converting element in the core may be approximately uniform over the entire length of the core, or may not be uniform.

[0053] The light-transmitting material is, for example, any one of a fluoride, an oxide, or a nitride. The fluoride is, for example, a fluoride glass. The oxide is, for example, silicon oxide, quartz, etc. In the optical fiber 3a, the wavelength converting element is a rare earth element. Here, the wavelength converting element includes, for example, an element selected from the group of Pr, Tb, Ho, Dy, Er, Eu, Nd, and Mn. The wavelength converting element is contained in the core as ions of a rare earth element, and is, for example, ions of Pr (Pr 3+), Tb ions (Tb 3+ ) is included.

[0054] 5, the light source unit 1a includes an optical fiber 3a and a plurality of (eg, three) laser light sources 2. The three laser light sources 2 include a first laser light source 21 and two second laser light sources 22 and .

[0055] The first laser light source 21 emits excitation light P1 for exciting a wavelength conversion element in the core of the optical fiber 3a. The excitation light P1 emitted from the first laser light source 21 is incident on the optical fiber 3a. The two second laser light sources 22 and 23 emit seed light P2 (hereinafter also referred to as external seed light P2) for generating stimulated emission light from the wavelength conversion element excited by the excitation light P1. The seed light P2 (P21) emitted from the second laser light source 22 and the seed light P2 (P22) emitted from the second laser light source 23 are incident on the optical fiber 3a.

[0056] The wavelength converting element is excited by the excitation light P1. The wavelength converting element may be excited by light amplified using spontaneous emission light emitted from another wavelength converting element as internal seed light, that is, amplified spontaneous emission (ASE). The wavelengths of the ASE and seed light P2 are longer than the wavelength of the excitation light P1 (for example, 440 nm or more and 450 nm or less).

[0057] Pr 3+ is a wavelength conversion element that can emit ASE or amplified light of the seed light in the cyan to red range. The intensity of the stimulated emission depends on the intensity of the internal seed light (spontaneous emission light) and the external seed light P2. The core is Pr 3+ and Tb 3+ If it contains Tb 3+ Pr 3+ It is excited by absorbing ASE from Tb 3+ It is also possible to generate ASE with a specific wavelength.

[0058] The first laser light source 21 is, for example, a semiconductor laser that emits blue laser light. In this case, the excitation light P1 has a wavelength of, for example, 440 nm or more and 450 nm or less.

[0059] The two second laser light sources 22 and 23 emit seed light P2 having different wavelengths, for example. The second laser light source 22 is, for example, a semiconductor laser that emits green light. The second laser light source 23 is, for example, a semiconductor laser that emits red light. The wavelength conversion element Pr 3+ In the case where the light source unit 1a includes three second laser light sources 22 and 23, the wavelength of the green seed light P21 is preferably about 520 nm, and the wavelength of the red seed light P22 is preferably about 640 nm. Each of the two second laser light sources 22 and 23 is a light source that emits quasi-monochromatic light. Here, quasi-monochromatic light is light included in a narrow wavelength range (for example, 10 nm). The light source unit 1a includes two second laser light sources 22 and 23 as laser light sources that emit the seed light P2, but the number of second laser light sources that emit the seed light P2 is not limited to two, and may be three or more, or may be one. In the case where the light source unit 1a includes three second laser light sources that emit the seed light P2, the three second laser light sources that emit the seed light P2 include, for example, the second laser light source 22 made of a semiconductor laser that emits green light, the second laser light source 23 made of a semiconductor laser that emits red light, and the second laser light source made of a semiconductor laser that emits orange light. The wavelength of the orange seed light is preferably, for example, about 600 nm.

[0060] The light source unit 1a has a housing 28a that houses a first laser light source 21 and two second laser light sources 22 and 23.

[0061] Moreover, the light source unit 1a further includes an adjustment unit 24. The adjustment unit 24 adjusts the intensity of the excitation light P1 and the intensity of each of the seed lights P21 and P22. The adjustment unit 24 includes a first drive circuit for driving the first laser light source 21, a second drive circuit for driving the second laser light source 22, a third drive circuit for driving the second laser light source 23, and a control circuit. The control circuit controls the first drive circuit, the second drive circuit, and the third drive circuit individually. In the adjustment unit 24, the control circuit controls the first drive circuit, the second drive circuit, and the third drive circuit individually, thereby making it possible to adjust the chromaticity of the light emitted from the optical fiber 3a. In short, the light source unit 1a is capable of adjusting the color by including the adjustment unit 24. This allows the light source unit 1a to adjust the color of the light emitted from the projection unit 4a (see FIG. 6). The adjustment unit 24 is housed in the housing 28a, but is not limited thereto and may not be housed in the housing 28a. The first drive circuit, the second drive circuit, and the third drive circuit are supplied with a power supply voltage from, for example, a first power supply circuit. The control circuit is supplied with a power supply voltage from, for example, a second power supply circuit. The first power supply circuit and the second power supply circuit are not included in the components of the light source unit 1a, but are not limited thereto and may be included.

[0062] The light source unit 1a may further include an optical coupling section 29 for inputting the excitation light P1 and each seed light P2 to the first end 31a of the optical fiber 3a. The optical coupling section 29 is disposed in an opening 281a of the housing 28a. The optical coupling section 29 is a grating, but is not limited to this. The grating is a transmissive diffraction grating. The material of the grating is, for example, quartz, but is not limited to this.

[0063] In the optical fiber 3a, stimulated emission occurs due to the spontaneous emission light and the seed light P2, so that the excitation light P1 and stimulated emission light amplified by stimulated emission are output. The intensity of the light having the same wavelength as the seed light P21 among the light output from the optical fiber 3a is greater than the intensity of the seed light P21 input from the second laser light source 22 to the optical fiber 3a. Also, the intensity of the light having the same wavelength as the seed light P22 among the light output from the optical fiber 3a is greater than the intensity of the seed light P22 input from the second laser light source 23 to the optical fiber 3a. The white light Lw (see FIG. 6) output from the optical fiber 3a is coherent light. In the light source unit 1a, the chromaticity, color temperature, color rendering, and the like of the light output from the optical fiber 3a are determined according to the wavelength of the ASE and the wavelength of the seed light P2.

[0064] In the light source unit 1a, the adjustment unit 24 adjusts the intensity of the excitation light P1 and the intensity of each of the multiple seed light P2, but is not limited to this. For example, the adjustment unit 24 may be configured to adjust the intensity of the excitation light P1 and one of the multiple seed light P2.

[0065] Moreover, the light source unit 1a includes a projection unit 4a (see FIG. 6) instead of the projection unit 4 of the light source unit 1. The projection unit 4a includes a collimating lens 41a that collimates the white light Lw emitted from the second end 32a of the optical fiber 3a, and a housing 48a that houses the collimating lens 41a. This allows the light source unit 1a to project the white light Lw in a beam shape. In the housing 48a, at least a portion 481a that passes the white light Lw emitted from the collimating lens 41a is made of a light-transmitting material. In the housing 48a, at least the portion 481a that passes the white light Lw emitted from the collimating lens 41a may be an opening.

[0066] The light source unit 1a includes an optical fiber 3a, a first laser light source 21, and second laser light sources 22 and 23. The optical fiber 3a has a core including a wavelength conversion element. The wavelength conversion element is excited by the excitation light P1 to generate spontaneous emission light having a longer wavelength than the excitation light P1, and can be excited by the amplified spontaneous emission light. The first laser light source 21 emits excitation light P1 to be incident on the optical fiber 3a. The second laser light sources 22 and 23 emit seed light P2 to be incident on the optical fiber 3a to generate stimulated emission light from the wavelength conversion element excited by the excitation light P1 or the amplified spontaneous emission light.

[0067] The lighting system 100 according to the first variant of the first embodiment includes a light source unit 1a and a light distribution unit 5, and is therefore capable of providing illumination light L2 with light distribution control in the target space S1 without the need to install a lighting fixture on the ceiling facing the target space S1.

[0068] In addition, in the lighting system 100 according to the first modification of the first embodiment, the light source unit 1a has an adjustment section 24 that adjusts the intensity of each of the seed light beams P2 of multiple wavelengths, making it possible to adjust the chromaticity of the white light Lw emitted from the light source unit 1a.

[0069] Moreover, the lighting system 100 according to the first modification of the first embodiment can increase the intensity of each of the green and red stimulated emission lights. This allows the lighting system 100 according to the first modification to improve the color rendering of the illumination light L2. Furthermore, the lighting system 100 according to the first modification has a core of the optical fiber 3a that functions as two types of wavelength conversion elements, Pr 3+ and Tb 3+ Since the illumination light L2 contains the above, it is possible to further improve the color rendering of the illumination light L2.

[0070] (Modification 2 of the first embodiment) The lighting system 100 according to the second modification of the first embodiment includes a light source unit 1b (see FIG. 7) instead of the light source unit 1. The basic configuration of the lighting system 100 according to the second modification of the first embodiment is similar to that of the lighting system 100 according to the first embodiment, and therefore will not be illustrated or described.

[0071] The light source unit 1b includes a plurality (three) of laser light sources 2. The three laser light sources 2 include a red semiconductor laser 2R (hereinafter also referred to as laser light source 2R) that emits red light Lr, a green semiconductor laser 2G (hereinafter also referred to as laser light source 2G) that emits green light Lg, and a blue semiconductor laser 2B (hereinafter also referred to as laser light source 2B) that emits blue light Lb. In the light source unit 1b, the red light Lr, the green light Lg, and the blue light Lb are incident on the optical fiber 3.

[0072] The light that is input to the optical fiber 3, propagates through the optical fiber 3, and is output from the optical fiber 3 is white light Lw that is a mixture of red light Lr, green light Lg, and blue light Lb.

[0073] The light source unit 1b further includes three mirrors 25R, 25G, and 25B that correspond one-to-one to the three laser light sources 2R, 2G, and 2B, a condenser lens 27, and a housing 28b. The housing 28b houses the three laser light sources 2R, 2G, and 2B, the three mirrors 25R, 25G, and 25B, and the condenser lens 27. The mirror 25R reflects the red light Lr from the red semiconductor laser 2R toward the condenser lens 27. The mirror 25G reflects the green light Lg from the green semiconductor laser 2G toward the condenser lens 27. The mirror 25B reflects the blue light Lb from the blue semiconductor laser 2B toward the condenser lens 27.

[0074] The mirror 25R, the mirror 25G, the mirror 25B, the condenser lens 27, and the first end 31 of the optical fiber 3 are arranged in a straight line in the order of the mirror 25R, the mirror 25G, the mirror 25B, the condenser lens 27, and the first end 31 of the optical fiber 3. The mirror 25G is a dichroic mirror that reflects the green light Lg from the green semiconductor laser 2G toward the first end 31 of the optical fiber 3 and transmits the red light Lr reflected by the mirror 25R. The mirror 25B is a dichroic mirror that reflects the blue light Lb from the blue semiconductor laser 2B toward the first end 31 of the optical fiber 3 and transmits the red light Lr reflected by the mirror 25R and the green light Lg reflected by the mirror 25G.

[0075] In the light source unit 1b, the three laser light sources 2 and the optical fiber 3 are optically coupled by three mirrors 25R, 25G, and 25B and a condenser lens 27.

[0076] In the light source unit 1b, the projection unit 4 (see FIG. 1) has a collimating lens that collimates the white light Lw emitted from the optical fiber 3, and projects the white light Lw collimated by the collimating lens into the target space S1. The white light Lw projected from the projection unit 4 is incident on the light distribution unit 5 (see FIG. 1) as incident light L1.

[0077] The lighting system 100 according to the second modification of the first embodiment includes a light source unit 1b and a light distribution section 5. The light distribution section 5 has a reflecting section 6 and a diffusing section 7. This makes it possible to provide illumination light L2 with light distribution control in the target space S1 without installing a lighting fixture on the ceiling facing the target space S1.

[0078] (Embodiment 2) Hereinafter, the lighting system 100 according to the second embodiment will be described with reference to Fig. 8. Regarding the lighting system 100 according to the second embodiment, the same components as those in the lighting system 100 according to the first embodiment (see Fig. 1) are denoted by the same reference numerals and will not be described.

[0079] The lighting system 100 according to the second embodiment differs from the lighting system 100 according to the first embodiment in that the lighting system 100 according to the second embodiment includes a light distribution section 5c instead of the light distribution section 5 of the lighting system 100 according to the first embodiment.

[0080] The light distribution unit 5c has a reflecting unit 6 that reflects the incident light L1 and a diffusing unit 7 that diffuses the incident light L1. In the light distribution unit 5c, the reflecting surface 61 of the reflecting unit 6 includes an uneven structure 610 that diffusely reflects the incident light L1, and the uneven structure 610 of the reflecting surface 61 also serves as the diffusing unit 7. The uneven structure 610 includes a plurality of curved surfaces that are randomly formed. The shape of the uneven structure 610 is determined based on the desired light distribution angle of the illumination light L2. In the light distribution unit 5c, the uneven structure 610 determines the light distribution angle of the illumination light L2. The reflecting surface 61 of the reflecting unit 6 has an uneven structure 610, but the surface roughness Ra of the reflecting surface 61 is smaller than one tenth of the height of the protrusions 63, and the interior angle θ between the reflecting surface 61 and the main surface 62 of the reflecting unit 6 can be considered to be the same as the interior angle θ between the reflecting surface 61 and the main surface 62 of the reflecting unit 6 in the lighting system 100 according to embodiment 1. Here, "the same" means that the interior angle θ between the reflecting surface 61 and the main surface 62 of the reflecting unit 6 in the light distribution unit 5c is 90% or more and 110% or less of the interior angle θ between the reflecting surface 61 and the main surface 62 of the reflecting unit 6 in the lighting system 100 according to embodiment 1.

[0081] The lighting system 100 of embodiment 2 includes a light source unit 1 (see FIG. 1) and a light distribution section 5c. The light distribution section 5c has a reflecting section 6 and a diffusing section 7, so that it is possible to provide illumination light L2 with light distribution control to the target space S1 without installing a lighting fixture on the ceiling facing the target space S1.

[0082] Furthermore, in the lighting system 100 according to the second embodiment, the uneven structure 610 of the reflecting surface 61 also serves as the diffusing section 7, making it possible to reduce the number of parts and to more effectively utilize the incident light L1.

[0083] In the lighting system 100 according to the modified example of the second embodiment, the reflective layer 64 and the protrusions 63 may be integrally formed.

[0084] (Embodiment 3) Hereinafter, a lighting system 100 according to a third embodiment will be described with reference to Figs. 9 and 10. Regarding the lighting system 100 according to the third embodiment, components similar to those of the lighting system 100 according to the first embodiment (see Fig. 1) are denoted by the same reference numerals and will not be described.

[0085] The lighting system 100 according to the third embodiment differs from the lighting system 100 according to the first embodiment in that the lighting system 100 according to the third embodiment includes a plurality of light distribution sections 5 (four in the illustrated example).

[0086] The multiple light distribution sections 5 are aligned in a direction (hereinafter also referred to as a specified direction) along a main surface 62 opposite to the reflecting surface 61 of the reflecting section 6 in a side view from a direction perpendicular to the traveling direction of the incident light L1 (see FIGS. 1 and 10). The multiple light distribution sections 5 are aligned periodically in the specified direction. In the lighting system 100 according to the third embodiment, a light distribution member 50 integrating the multiple light distribution sections 5 is disposed on a lower surface 111 of a building material main body 110. The building material 11 has the building material main body 110 and the light distribution member 50.

[0087] The length of each of the plurality of light distribution sections 5 in the specified direction is shorter than the length of the light distribution section 5 in the lighting system 100 according to the first embodiment. The total length of the plurality of light distribution sections 5 in the specified direction is, for example, the same as the length of the light distribution section 5 in the lighting system 100 according to the first embodiment. In the lighting system 100 according to the first embodiment, one light distribution section 5 is provided for one building material body 110, whereas in the lighting system 100 according to the third embodiment, multiple light distribution sections 5 are provided for one building material body 110. The light distribution member 50 is configured as a sheet-like member in which multiple light distribution sections 5 are integrated. FIG. 10 is an explanatory diagram of the distribution of illumination light L2 by the lighting system 100 according to the third embodiment. Here, FIG. 10 shows a schematic diagram of the relationship between the light distribution member 50, the incident light L1, the beam spot SL1 of the incident light L1 on the light distribution member 50, and the irradiation range of the illumination light L2 on the floor surface when viewed downward from above the ceiling.

[0088] In the light distribution member 50, for example, the length of each of the multiple light distribution sections 5 in the specified direction is determined based on the shape, size, etc. of the beam spot SL1 of the beam-like incident light L1 so that the incident light L1 is incident across the multiple light distribution sections 5 as shown in Figure 10.

[0089] The lighting system 100 according to the third embodiment makes it possible to reduce the downward protrusion height of the protrusion 63 from the lower surface 111 of the building material main body 110, and therefore makes it possible to reduce the maximum thickness of the building material 11.

[0090] The lighting system 100 of embodiment 3 includes a light source unit 1 and a plurality of light distribution sections 5, each of which has a reflecting section 6 and a diffusing section 7. Therefore, it is possible to provide illumination light L2 with light distribution control to the target space S1 without installing a lighting fixture on the ceiling facing the target space S1.

[0091] Moreover, since the lighting system 100 according to the third embodiment includes a plurality of light distribution sections 5 arranged in the specified direction, it is possible to reduce the maximum thickness of the light distribution sections 5, thereby making it possible to reduce the maximum thickness of the building material 11. Furthermore, the lighting system 100 according to the third embodiment makes it possible to improve the design as seen by a person 19 (see FIG. 1) in the target space S1.

[0092] (Modification of the third embodiment) As shown in Fig. 11, lighting system 100 according to the modified example of embodiment 3 differs from lighting system 100 according to embodiment 3 in that the multiple light distribution sections 5 include multiple first light distribution sections 51 and multiple second light distribution sections 52. The basic configuration of lighting system 100 according to the modified example of embodiment 3 is similar to that of lighting system 100 according to embodiment 3, and therefore will not be illustrated or described. Fig. 11 can be viewed in the same way as Fig. 10.

[0093] In the multiple first light distribution sections 51, the orientation of the reflective surface 61 (see FIG. 9) of the reflector 6 is the same. In the multiple second light distribution sections 52, the orientation of the reflective surface 61 (see FIG. 9) of the reflector 6 is the same. In addition, the orientation of the reflective surface 61 of the reflector 6 of the first light distribution section 51 and the orientation of the reflective surface 61 of the second light distribution section 52 are different from each other. The orientation of the reflective surface 61 of the reflector 6 of the first light distribution section 51 and the orientation of the reflective surface 61 of the second light distribution section 52 are determined so that, for example, the illumination light L2 distributed by the multiple first light distribution sections 51 and the illumination light L2 distributed by the multiple second light distribution sections 52 are distributed in different directions and do not overlap on the floor surface. The first light distribution section 51 and the second light distribution section 52 differ from each other in the direction of a normal to the reflective surface 61 of the reflective section 6 in the first light distribution section 51 and the direction of a normal to the reflective surface 61 of the reflective section 6 in the second light distribution section 52. The angle between the reflective surface 61 in the first light distribution section 51 and a plane PL1 including the main surface 62 (see FIG. 9) and the underside 111 of the building material main body 110 (see FIG. 9) is the same as the angle between the reflective surface 61 in the second light distribution section 52 and a plane PL1 including the main surface 62 (see FIG. 9) and the underside 111 of the building material main body 110 (see FIG. 9).

[0094] In the lighting system 100 according to the modification of the third embodiment, the orientation of the reflective surface 61 of the reflector 6 of the first light distribution section 51 and the orientation of the reflective surface 61 of the reflector 6 of the second light distribution section 52 are different from each other, so that the lighting system 100 can distribute the illumination light L2 in a plurality of directions (two directions in the example of FIG. 11). In the lighting system 100 according to the modification of the third embodiment, the plurality of light distribution sections 5 include the plurality of first light distribution sections 51 and the plurality of second light distribution sections 52, but are not limited thereto, and may further include, for example, a plurality of third light distribution sections having a reflective surface in a different orientation from the orientation of the reflective surface 61 of the first light distribution section 51 and the orientation of the reflective surface 61 of the second light distribution section 52. In this case, the lighting system 100 can distribute the illumination light L2 in three directions. The directions in which the illumination light L2 is distributed in the lighting system 100 are not limited to two or three, and may be four or more.

[0095] Moreover, the plurality of light distribution sections 5 may include at least one first light distribution section 51 and at least one second light distribution section 52.

[0096] (Embodiment 4) Hereinafter, a lighting system 100 according to a fourth embodiment will be described with reference to Fig. 12. Regarding the lighting system 100 according to the fourth embodiment, components similar to those of the lighting system 100 according to the first embodiment will be denoted by the same reference numerals and will not be described.

[0097] The lighting system 100 according to the fourth embodiment differs from the lighting system 100 according to the first embodiment in that the lighting system 100 according to the fourth embodiment includes a plurality of light distribution sections 5 (two in the illustrated example).

[0098] The plurality of light distribution sections 5 include a first light distribution section 51 and a second light distribution section 52. The orientation of the reflective surface 61 of the reflective section 6 of the first light distribution section 51 and the orientation of the reflective surface 61 of the second light distribution section 52 are different from each other. The first light distribution section 51 and the second light distribution section 52 are different in the orientation of the normal to the reflective surface 61 of the reflective section 6 of the first light distribution section 51 and the orientation of the normal to the reflective surface 61 of the reflective section 6 of the second light distribution section 52. The first light distribution section 51 and the second light distribution section 52 are different in the inclination of the reflective surface 61 with respect to the main surface 62 of each reflector 6. If the angle between the reflective surface 61 and the principal surface 62 (plane PL1 including the underside 111 of the building material body 110) in the first light distribution section 51 is η21, and the angle between the reflective surface 61 and the principal surface 62 in the second light distribution section 52 is η22, in the illustrated example, η21 > η22.

[0099] The multiple light distribution sections 5 are lined up in a direction (hereinafter also referred to as a specified direction) along a main surface 62 opposite to the reflecting surface 61 of the reflecting section 6 in a side view from a direction perpendicular to the traveling direction of the incident light L1 (see FIG. 1). In the lighting system 100 according to the fourth embodiment, a light distribution member 50 integrating the multiple light distribution sections 5 is disposed on a lower surface 111 of a building material main body 110. The building material 11 has the building material main body 110 and the light distribution member 50.

[0100] The length of each of the plurality of light distribution sections 5 in the specified direction is shorter than the length of the light distribution section 5 in the lighting system 100 according to embodiment 1. The total length of the plurality of light distribution sections 5 in the specified direction is, for example, the same as the length of the light distribution section 5 in the lighting system 100 according to embodiment 1. In the lighting system 100 according to embodiment 1, one light distribution section 5 is provided for one building material main body 110, whereas in the lighting system 100 according to embodiment 4, multiple light distribution sections 5 are provided for one building material main body 110. The light distribution member 50 is configured as a single sheet-like member in which multiple light distribution sections 5 are integrated.

[0101] The lighting system 100 of embodiment 4 includes a light source unit 1 and a light distribution section 5. The light distribution section 5 has a reflecting section 6 and a diffusing section 7. Therefore, it is possible to provide illumination light L2 with light distribution control to the target space S1 without installing a lighting fixture on the ceiling facing the target space S1.

[0102] Furthermore, in the lighting system 100 of embodiment 4, the orientation of the reflective surface 61 of the reflective section 6 of the first light distribution section 51 is different from the orientation of the reflective surface 61 of the reflective section 6 of the second light distribution section 52 (here, the inclinations of the reflective surface 61 with respect to the principal surface 62 of each reflective section 6 of the first light distribution section 51 and the second light distribution section 52 are different from each other), making it possible to distribute illumination light L2 in multiple directions for one incident light L1.

[0103] (Embodiment 5) Hereinafter, a lighting system 100 according to embodiment 5 will be described with reference to Figures 13A to 13C. Regarding the lighting system 100 according to embodiment 5, components similar to those of the lighting system 100 according to embodiment 1 will be denoted by the same reference numerals and description thereof will be omitted.

[0104] The lighting system 100 according to the fifth embodiment differs from the lighting system 100 according to the first embodiment in that the lighting system 100 according to the fifth embodiment includes a diffusion section 7c instead of the diffusion section 7 of the light distribution section 5 of the lighting system 100 according to the first embodiment.

[0105] The diffusion section 7c is configured to make the distribution angle of the illumination light L2 (see FIG. 1) when viewed from a first direction D1, which is a direction perpendicular to the traveling direction of the incident light L1 (see FIG. 1), different from the distribution angle of the illumination light L2 when viewed from a second direction D2 perpendicular to the first direction D1. FIG. 13B corresponds to a cross section of the diffusion section 7c perpendicular to the first direction D1, and FIG. 13C corresponds to a cross section of the diffusion section 7c perpendicular to the second direction D2. The diffusion section 7c has a different shape of the uneven structure 710 between a cross section perpendicular to the first direction D1 and a cross section perpendicular to the second direction D2. In the diffusion section 7c, the distance between the peaks of the multiple curved surfaces (convex curved surfaces) 73 (see FIG. 13C) in a cross section perpendicular to the second direction D2 is shorter than the distance between the peaks of the multiple curved surfaces (convex curved surfaces) 73 (see FIG. 13B) in a cross section perpendicular to the first direction D1. In addition, in the diffusing section 7c, the radius of curvature of the curved surface 73 in a cross section perpendicular to the second direction D2 is smaller than the radius of curvature of the curved surface 73 in a cross section perpendicular to the first direction D1. In the lighting system 100 according to the first embodiment, the uneven structure 710 of the diffusing section 7 is formed so as to obtain a circular light distribution pattern on the irradiation surface of the illumination light L2 as the illumination light L2, whereas in the lighting system 100 according to the fifth embodiment, the uneven structure 710 of the diffusing section 7c is formed so as to obtain an elliptical light distribution pattern on the irradiation surface of the illumination light L2 as the illumination light L2.

[0106] The lighting system 100 of embodiment 5 includes a light source unit 1 and a light distribution section 5. The light distribution section 5 has a reflecting section 6 and a diffusing section 7c, so that it is possible to provide illumination light L2 with light distribution control to the target space S1 without installing a lighting fixture on the ceiling facing the target space S1.

[0107] (Embodiment 6) Hereinafter, a lighting system 100 according to a sixth embodiment will be described with reference to Fig. 14. Regarding the lighting system 100 according to the sixth embodiment, components similar to those of the lighting system 100 according to the first embodiment will be denoted by the same reference numerals and will not be described.

[0108] The lighting system 100 according to the sixth embodiment includes a plurality of light distribution sections 5 (two in the illustrated example). The plurality of light distribution sections 5 include a first light distribution section 51 and a second light distribution section 52. When viewed from a direction perpendicular to the traveling direction of the incident light L1, a light distribution angle of the illumination light L2 by the first diffusion section 71, which is the diffusion section 7 of the first light distribution section 51, (hereinafter also referred to as a first light distribution angle) is different from a light distribution angle of the illumination light L2 by the second diffusion section 72, which is the diffusion section 7 of the second light distribution section 52, (hereinafter also referred to as a second light distribution angle). When viewed from a direction perpendicular to the traveling direction of the incident light L1 (see FIG. 1), a shape of the uneven structure 710 of the first diffusion section 71 is different from a shape of the uneven structure 710 of the second diffusion section 72. The shape of the uneven structure 710 of the first diffusion section 71 is determined so that the light distribution angle of the illumination light L2 is the first light distribution angle. Moreover, the shape of the uneven structure 710 of the second diffusing portion 72 is determined so that the light distribution angle of the illumination light L2 becomes the second light distribution angle.

[0109] The lighting system 100 of embodiment 6 includes a light source unit 1 and a light distribution section 5. The light distribution section 5 has a reflecting section 6 and a diffusing section 7, so that it is possible to provide illumination light L2 with light distribution control to the target space S1 without installing a lighting fixture on the ceiling facing the target space S1.

[0110] Furthermore, in the lighting system 100 of embodiment 6, when viewed from a direction perpendicular to the traveling direction of the incident light L1, the light distribution angle of the illumination light L2 by the first diffusion section 71 and the light distribution angle of the illumination light L2 by the second diffusion section 72 are different, so that it is possible to provide multiple illumination lights L2 with different light distribution characteristics to the target space S1 in response to one incident light L1.

[0111] In the lighting system 100 according to the sixth embodiment, a light distribution member 50 in which a plurality of light distribution sections 5 are integrated is disposed on the underside 111 of a building material main body 110. The building material 11 has a building material main body 110 and a light distribution member 50. In the lighting system 100 according to the first embodiment, one light distribution section 5 is provided for one building material main body 110, whereas in the lighting system 100 according to the sixth embodiment, a plurality of light distribution sections 5 are provided for one building material main body 110. The light distribution member 50 is configured as a single sheet-like member in which a plurality of light distribution sections 5 are integrated.

[0112] In the lighting system 100 according to the modification of the sixth embodiment, one light distribution section 5 may have a plurality of diffusion sections 7 for one reflection section 6.

[0113] (Embodiment 7) Hereinafter, a lighting system 100 according to a seventh embodiment will be described with reference to Fig. 15. Regarding the lighting system 100 according to the seventh embodiment, components similar to those of the lighting system 100 according to the first embodiment will be denoted by the same reference numerals and will not be described.

[0114] The lighting system 100 according to the seventh embodiment further includes a resin layer 8 having light-transmitting properties. The resin layer 8 is a transparent resin layer. The resin layer 8 covers the light distribution section 5. With regard to the resin layer 8, "having light-transmitting properties" means that the total light transmittance for visible light (incident light L1) is preferably 50% or more, more preferably 70% or more, and even more preferably 90% or more. The material of the resin layer 8 includes, for example, a silicone resin, an acrylic resin, or a fluorine-based resin.

[0115] The resin layer 8 has a principal surface 81 opposite to the surface in contact with the light distribution section 5. The principal surface 81 of the resin layer 8 is planar. The thickness of the resin layer 8 in the normal direction to the reflecting surface 61 is uniform regardless of the position on the reflecting surface 61. The principal surface 81 of the resin layer 8 is parallel to the reflecting surface 61. The principal surface 81 of the resin layer 8 is not limited to being strictly parallel to the reflecting surface 61, and may be any angle with the reflecting surface 61 that is 10 degrees or less, for example.

[0116] The lighting system 100 of embodiment 7 includes a light source unit 1 and a light distribution section 5. The light distribution section 5 has a reflecting section 6 and a diffusing section 7. Therefore, it is possible to provide illumination light L2 with light distribution control to the target space S1 without installing a lighting fixture on the ceiling facing the target space S1.

[0117] In the lighting system 100 according to the seventh embodiment, a light distribution member 50 in which a plurality of light distribution sections 5 are integrated is disposed on the underside 111 of a building material main body 110. The building material 11 has a building material main body 110 and a light distribution member 50. In the lighting system 100 according to the first embodiment, one light distribution section 5 is provided for one building material main body 110, whereas in the lighting system 100 according to the seventh embodiment, a plurality of light distribution sections 5 are provided for one building material main body 110. The light distribution member 50 is configured as a single sheet-like member in which a plurality of light distribution sections 5 are integrated.

[0118] Furthermore, since the lighting system 100 according to the seventh embodiment further includes a resin layer 8, it is possible to prevent foreign matter such as dust from adhering to the uneven structure 710 of the diffusion section 7 in the light distribution section 5, and the light distribution section 5 can be protected by the resin layer 8.

[0119] (Embodiment 8) An illumination system 100 according to an eighth embodiment will be described with reference to Fig. 16. Regarding the illumination system 100 according to the eighth embodiment, components similar to those of the illumination system 100 according to the seventh embodiment will be denoted by the same reference numerals and description thereof will be omitted.

[0120] In the lighting system 100 according to the eighth embodiment, the principal surface 81 of the resin layer 8 opposite to the light distribution section 5 side is parallel to the principal surface 62 of the reflection section 6 opposite to the reflection surface 61. In addition, the principal surface 81 of the resin layer 8 is parallel to the lower surface 111 of the building material main body 110. The principal surface 81 of the resin layer 8 is not limited to being strictly parallel to the principal surface 62 of the reflection section 6, and may be, for example, an angle of 10 degrees or less between the principal surface 62 and the resin layer 8. In addition, the principal surface 81 of the resin layer 8 is not limited to being strictly parallel to the lower surface 111 of the building material main body 110, and may be, for example, an angle of 10 degrees or less between the principal surface 81 and the lower surface 111 of the building material main body 110.

[0121] Moreover, the lighting system 100 according to the eighth embodiment further includes an antireflection layer 9. The antireflection layer 9 covers a main surface 81 of the resin layer 8 opposite to the light distribution section 5 side. The antireflection layer 9 is provided to suppress Fresnel reflection on the main surface 81 of the resin layer 8. The antireflection layer 9 has light-transmitting properties. With regard to the antireflection layer 9, "having light-transmitting properties" means that the total light transmittance for visible light (incident light L1) is preferably 50% or more, more preferably 70% or more, and even more preferably 90% or more. The material of the antireflection layer 9 includes, for example, a material having a refractive index lower than that of the material of the resin layer 8 (hereinafter also referred to as a low refractive index material). The low refractive index material is, for example, magnesium fluoride (MgF 2 ), and fluorine-based resins. The anti-reflection layer 9 is not limited to a single layer film of a low refractive index material, but may be, for example, a multilayer film in which a first inorganic material layer having a relatively high refractive index and a second inorganic material layer having a relatively low refractive index are alternately laminated. The material of the first inorganic material layer is, for example, titanium oxide (TiO 2 ), tantalum oxide (Ta 2 O 5 ) or niobium oxide (Nb 2 O 5 The material of the second inorganic material layer includes, for example, silicon oxide (SiO 2 ) or magnesium fluoride (MgF 2 ).

[0122] Since the lighting system 100 of embodiment 8 is provided with an anti-reflection layer 9, it is possible to prevent the incident light L1 from being reflected before it reaches the light distribution section 5, and it is possible to prevent deterioration of the light distribution characteristics of the illumination light L2.

[0123] (Embodiment 9) A lighting system 100 according to a ninth embodiment will be described with reference to Fig. 17. Regarding the lighting system 100 according to the ninth embodiment, components similar to those of the lighting system 100 according to the first embodiment are denoted by the same reference numerals and will not be described.

[0124] The lighting system 100 according to the ninth embodiment differs from the lighting system 100 according to the first embodiment in that the diffusion section 7 is arranged parallel to the main surface 62 of the reflection section 6.

[0125] Like the lighting system 100 of the first embodiment, the lighting system 100 of the ninth embodiment includes a light source unit 1 and a light distribution section 5. The light distribution section 5 has a reflecting section 6 and a diffusing section 7. This makes it possible to provide illumination light L2 with light distribution control in the target space S1 without installing a lighting fixture on the ceiling facing the target space S1.

[0126] (Embodiment 10) A lighting system 100 according to a tenth embodiment will be described with reference to Fig. 18. Regarding the lighting system 100 according to the tenth embodiment, components similar to those of the lighting system 100 according to the first embodiment will be denoted by the same reference numerals and will not be described.

[0127] In the lighting system 100 of embodiment 1, the reflective section 6 of the light distribution section 5 includes a protrusion 63 that protrudes downward from the underside 111 of the building material main body 110, whereas in the lighting system 100 of embodiment 10, the building material main body 110 has a recess with a V-shaped cross section that is recessed upward from the underside 111 of the building material main body 110, and the reflective surface 61 and the diffusing section 7 are arranged within the recess.

[0128] In the lighting system 100 according to the tenth embodiment, the main surface 62 of the reflector 6 is a surface parallel to the reflecting surface 61 of the reflector 6 .

[0129] In the lighting system 100 according to the tenth embodiment, the reflecting surface 61 of the reflecting section 6 is inclined with respect to a plane (reference plane) PL1 that includes the lower surface 111 of the building material main body 110.

[0130] The lighting system 100 of embodiment 10, like the lighting system 100 of embodiment 1, comprises a light source unit 1 and a light distribution section 5. The light distribution section 5 has a reflecting section 6 and a diffusing section 7. Therefore, it is possible to provide illumination light L2 with light distribution control to the target space S1 without installing a lighting fixture on the ceiling facing the target space S1.

[0131] Furthermore, in the lighting system 100 of embodiment 10, the reflective surface 61 and the diffusion section 7 are arranged within the recess of the building material main body 110, so that the light distribution section 5 can be prevented from protruding from the underside 111 of the building material main body 110, thereby making it possible to improve the design compared to the lighting system 100 of embodiment 1.

[0132] (Other variations) The above-mentioned embodiments 1 to 10 are merely one of various embodiments of the present disclosure. The above-mentioned embodiments 1 to 10 can be modified in various ways depending on the design, etc., as long as the object of the present disclosure can be achieved.

[0133] For example, the first construction material 11 is not limited to a ceiling material, but may be, for example, a beam.

[0134] In the lighting system 100, the laser light source 2 is not limited to a semiconductor laser that emits blue laser light, and may be, for example, a semiconductor laser that emits purple laser light. In this case, it is preferable that the wavelength conversion unit 40 includes blue phosphor particles, yellow phosphor particles, green phosphor particles, and red phosphor particles.

[0135] Moreover, the optical fiber 3 is not an essential component of the lighting system 100. When the lighting system 100 does not include the optical fiber 3, for example, the projection unit 4 may be disposed in a housing 28, and the housing 28 may be disposed at a position higher than the floor surface F1.

[0136] The material of the protrusion 63 of the reflecting portion 6 may be a material different from the material of the building material body 110. In this case, the protrusion 63 is a separate member from the building material body 110, and is fixed to the lower surface 111 of the building material body 110.

[0137] Furthermore, the light distribution section 5 may be a member separate from the first building material 11, or may be fixed to the first building material 11 or the second building material 12.

[0138] (Aspect) Based on the above-described embodiments 1 to 10, the present specification discloses the following aspects.

[0139] The lighting system (100) according to the first embodiment includes a light source unit (1; 1a; 1b) and a light distribution unit (5; 5c). The light source unit (1; 1a; 1b) includes a laser light source (2). The light distribution unit (5; 5c) is separated from the light source unit (1; 1a; 1b) and converts incident light (L1), which is a beam-like light emitted from the light source unit (1; 1a; 1b) to a target space (S1), into illumination light (L2) and distributes the light to the target space (S1). The light distribution unit (5) includes a reflecting unit (6) that reflects the incident light (L1) toward the target space (S1) and a diffusing unit (7; 7c) that diffuses the incident light (L1) toward the target space (S1).

[0140] The lighting system (100) according to the first aspect can provide illumination light (L2) with light distribution control in a target space (S1) without using a lighting fixture.

[0141] In the illumination system (100) according to the second aspect, in the first aspect, the reflector (6) has a reflecting surface (61) that reflects incident light (L1) and a main surface (62) opposite to the reflecting surface (61). When viewed from a direction perpendicular to the traveling direction of the incident light (L1), the reflecting surface (61) is inclined with respect to the main surface (62).

[0142] The illumination system (100) according to the second embodiment makes it possible to determine the optical axis of the illumination light (L2) by the inclination of the reflecting surface (61) relative to the main surface (62) of the reflecting portion (6).

[0143] In the lighting system (100) according to the third aspect, in the second aspect, the reflective surface (61) includes an uneven structure (610) that diffusely reflects the incident light (L1), and the uneven structure (610) of the reflective surface (61) also serves as the diffusion section (7).

[0144] The lighting system (100) according to the third aspect can utilize the incident light (L1) more effectively while reducing the number of parts.

[0145] The lighting system (100) according to the fourth aspect is the lighting system according to the second or third aspect, and includes a plurality of light distribution sections (5). The plurality of light distribution sections (5) include a first light distribution section (51) and a second light distribution section (52). The first light distribution section (51) and the second light distribution section (52) have reflecting surfaces (61) of their respective reflecting sections (6) that face in different directions.

[0146] The lighting system (100) according to the fourth aspect is capable of distributing illumination light (L2) in a plurality of directions in response to a single incident light (L1).

[0147] In the lighting system (100) according to the fifth aspect, the first light distribution section (51) and the second light distribution section (52) incline their reflective surfaces (61) relative to the main surfaces (62) of their respective reflective sections (6) in different directions.

[0148] In the lighting system (100) according to the sixth aspect, the first light distribution section (51) and the second light distribution section (52) in the fourth aspect have reflecting surfaces (61) facing in different directions relative to the main surface (62) of the reflecting sections (6) of the first and second light distribution sections (51 and 52).

[0149] In the lighting system (100) according to the seventh aspect, in any one of the second to sixth aspects, the diffusion section (7c) is configured to make the distribution angle of the illumination light (L2) when viewed from a first direction (D1), which is a direction perpendicular to the traveling direction of the incident light (L1), different from the distribution angle of the illumination light (L2) when viewed from a second direction (D2), which is perpendicular to the first direction (D1).

[0150] The lighting system (100) according to the seventh aspect can provide, as the lighting light (L2), a light distribution pattern having a shape other than a circle (for example, an ellipse) on the irradiation surface of the lighting light (L2).

[0151] The lighting system (100) according to the eighth aspect is the second aspect and includes a plurality of light distribution sections (5). The plurality of light distribution sections (5) include a first light distribution section (51) and a second light distribution section (52). When viewed from a direction perpendicular to the traveling direction of the incident light (L1), the light distribution angle of the illumination light (L2) by the first diffusion section (71) which is the diffusion section (7) of the first light distribution section (51) is different from the light distribution angle of the illumination light (L2) by the second diffusion section (72) which is the diffusion section (7) of the second light distribution section (52).

[0152] The lighting system (100) according to the eighth aspect is capable of providing a plurality of illumination lights (L2) having different light distribution characteristics to a target space (S1) in response to a single incident light (L1).

[0153] The lighting system (100) according to a ninth aspect is any one of the second to eighth aspects and includes a plurality of light distribution sections (5). The plurality of light distribution sections (5) are arranged in a direction along a main surface (62) opposite to the reflecting surface (61) of the reflecting section (6) in a side view from a direction perpendicular to the traveling direction of the incident light (L1).

[0154] The lighting system (100) according to the ninth aspect makes it possible to reduce the maximum thickness of the light distribution section (5).

[0155] In a lighting system (100) according to a tenth aspect, in any one of the second to ninth aspects, the light distribution section (5) is a building material (11) forming a part of a structure (ST1) facing a target space (S1). The light source unit (1) is disposed away from the building material (11). Incident light (L1) passes through the target space (S1) and enters the building material (11).

[0156] In the lighting system (100) according to the tenth aspect, it is possible to use a building material (11) as the light distribution section (5).

[0157] In the lighting system (100) according to the eleventh aspect, in the tenth aspect, the building material (11) is a ceiling material.

[0158] The lighting system (100) according to the eleventh aspect has an advantage that the lighting light (L2) can easily illuminate the target space (S1) and can easily provide natural lighting that does not feel strange to the person (19).

[0159] The lighting system (100) according to a twelfth aspect is any one of the second to eleventh aspects, further comprising a resin layer (8). The resin layer (8) covers the light distribution section (5). The resin layer (8) is light-transmitting.

[0160] In the lighting system (100) according to the twelfth aspect, the light distribution section (5) can be protected by the resin layer (8).

[0161] In a lighting system (100) according to a thirteenth aspect, in the twelfth aspect, the resin layer (8) has a main surface (81) opposite to the light distribution section (5). The main surface (81) of the resin layer (8) is parallel to the main surface (62) of the reflecting section (6).

[0162] The lighting system (100) according to a fourteenth aspect is the lighting system (100) of the thirteenth aspect, further comprising an antireflection layer (9). The antireflection layer (9) covers a main surface (81) of the resin layer (8) opposite to the light distribution section (5).

[0163] The lighting system (100) according to the fourteenth aspect includes an anti-reflection layer (9), which makes it possible to prevent the incident light (L1) from being reflected before it reaches the light distribution section (5), thereby making it possible to prevent deterioration in the light distribution characteristics of the illumination light (L2).

[0164] In the lighting system (100) according to the fifteenth aspect, in any one of the first to fourteenth aspects, the beam-like light emitted from the light source unit (1; 1a; 1b) is white light.

[0165] The lighting system (100) according to the fifteenth aspect can determine the chromaticity of the illumination light (L2) based on the chromaticity of the beam-shaped light emitted from the light source units (1; 1a; 1b).

[0166] In a lighting system (100) according to a sixteenth aspect, in any one of the first to fifteenth aspects, the light source unit (1; 1a; 1b) includes an optical fiber (3; 3a) into which light from a laser light source (2) is incident.

[0167] The lighting system (100) according to the sixteenth aspect provides a high degree of freedom in arranging the laser light source (2).

[0168] In the illumination system (100) according to the seventeenth aspect, in the sixteenth aspect, the optical fiber (3a) has a core including one or more elements selected from the group consisting of Pr, Tb, Ho, Dy, Er, Eu, Nd, and Mn as a wavelength conversion element. The light source unit (1a) includes a plurality of laser light sources (2). The plurality of laser light sources (2) include a first laser light source (21) and a second laser light source (22). The first laser light source (21) emits excitation light (P1) capable of exciting the wavelength conversion element to be incident on the optical fiber (3a). The second laser light source (22) emits seed light (P2) having a longer wavelength than the excitation light (P1) to be incident on the optical fiber (3a). The incident light (L1) includes light of a wavelength component having the same wavelength as the wavelength of the seed light (P2). The intensity of the light of the wavelength component is greater than the intensity of the seed light (P2).

[0169] In the lighting system (100) according to the seventeenth aspect, it is possible to increase the transmission distance of the beam-shaped light (white light Lw) serving as the incident light (L1).

[0170] In an illumination system (100) according to an eighteenth aspect, in any one of the first to fifteenth aspects, the light source unit (1b) includes a plurality of laser light sources (2). The light source unit (1b) includes an optical fiber (3) into which light from the plurality of laser light sources (2) is incident. The plurality of laser light sources (2) include a red semiconductor laser (2R) that emits red light (Lr), a green semiconductor laser (2G) that emits green light (Lg), and a blue semiconductor laser (2B) that emits blue light (Lb).

[0171] In the lighting system (100) according to the eighteenth aspect, it is possible to increase the transmission distance of the beam-shaped light (white light Lw) serving as the incident light (L1). [Explanation of symbols]

[0172] 1, 1a, 1b Light source unit 2 Laser light source 21 First laser light source 22 Second laser light source 23 Second laser light source 2B Blue semiconductor laser 2G Green Semiconductor Laser 2R Red semiconductor laser 3, 3a optical fiber 4, 4a Projection part 40 Wavelength conversion section 5, 5c Light distribution section 51 First light distribution section 52 Second light distribution section 6 Reflector 61 Reflective surface 610 Uneven structure 62 Main surface 7, 7c Diffusion part 710 Uneven structure 71 First diffusion section 72 Second diffusion section 8 Resin layer 81 Main Surface 9 Anti-reflection layer 11 Building materials (1st building materials) 12 Second building material 19 people 100 Lighting System D1 1st direction D2 2nd direction L1 incident light L2 illumination light Lb blue light lg green light Lr Red light Lw white light S1 Target space ST1 structure (first structure) ST2 2nd structure η1 Interior angle η2 Interior angle φ1 Angle of incidence φ2 Reflection angle

Claims

1. a light source unit including a laser light source; a plurality of light distribution units separated from the light source unit, which convert incident light, which is a beam of light emitted from the light source unit into a target space, into illumination light and distribute the illumination light into the target space; Each of the plurality of light distribution sections is A reflector that reflects the incident light toward the target space; A diffusion unit that diffuses the incident light toward the target space, the reflecting portion has a reflecting surface that reflects the incident light and a main surface opposite to the reflecting surface, When viewed from a direction perpendicular to the traveling direction of the incident light, the reflecting surface is inclined with respect to the main surface, The plurality of light distribution sections include A first light distribution section; A second light distribution section, The first light distribution section and the second light distribution section have different orientations of the reflective surfaces of the reflective sections. Lighting system.

2. the reflecting surface includes an uneven structure that diffusely reflects the incident light, The uneven structure of the reflecting surface also serves as the diffusing portion.

10. The lighting system of claim 1.

3. The first light distribution section and the second light distribution section have different inclinations of the reflecting surfaces with respect to the main surfaces of the reflecting sections.

3. A lighting system according to claim 1 or 2.

4. The first light distribution section and the second light distribution section have different orientations of the reflective surfaces with respect to the main surfaces of the reflective sections.

3. A lighting system according to claim 1 or 2.

5. a light source unit including a laser light source; a light distribution unit that is separated from the light source unit and converts incident light, which is a beam of light emitted from the light source unit into a target space, into illumination light and distributes the illumination light into the target space; The light distribution unit is A reflector that reflects the incident light toward the target space; A diffusion unit that diffuses the incident light toward the target space, the reflecting portion has a reflecting surface that reflects the incident light and a main surface opposite to the reflecting surface, When viewed from a direction perpendicular to the traveling direction of the incident light, the reflecting surface is inclined with respect to the main surface, The diffusion section is configured to make a light distribution angle of the illumination light when viewed from a first direction that is a direction perpendicular to a traveling direction of the incident light different from a light distribution angle of the illumination light when viewed from a second direction that is perpendicular to the first direction. Lighting system.

6. the reflecting surface includes an uneven structure that diffusely reflects the incident light, The uneven structure of the reflecting surface also serves as the diffusing portion.

6. A lighting system according to claim 5.

7. a light source unit including a laser light source; a plurality of light distribution units separated from the light source unit, which convert incident light, which is a beam of light emitted from the light source unit into a target space, into illumination light and distribute the illumination light into the target space; Each of the plurality of light distribution sections is A reflector that reflects the incident light toward the target space; A diffusion unit that diffuses the incident light toward the target space, the reflecting portion has a reflecting surface that reflects the incident light and a main surface opposite to the reflecting surface, When viewed from a direction perpendicular to the traveling direction of the incident light, the reflecting surface is inclined with respect to the main surface, The plurality of light distribution units include A first light distribution section; A second light distribution section, When viewed from a direction perpendicular to the traveling direction of the incident light, a light distribution angle of the illumination light by a first diffusion section that is the diffusion section of the first light distribution section is different from a light distribution angle of the illumination light by a second diffusion section that is the diffusion section of the second light distribution section. Lighting system.

8. The plurality of light distribution sections are arranged in a direction along the main surface of the reflecting section opposite to the reflecting surface in a side view from a direction perpendicular to the traveling direction of the incident light.

10. A lighting system according to claim 1, 2 or 7.

9. A plurality of the light distribution units are provided, The plurality of light distribution sections are arranged in a direction along the main surface of the reflecting section opposite to the reflecting surface in a side view from a direction perpendicular to the traveling direction of the incident light.

6. A lighting system according to claim 5.

10. The light distribution unit is a building material that forms a part of a structure facing the target space, The light source unit is disposed away from the building material, and the incident light passes through the target space and enters the building material.

8. A lighting system according to claim 1, 5 or 7.

11. The building material is a ceiling material.

11. The lighting system of claim 10.

12. The light-transmitting device further includes a resin layer covering the light distribution section and having light-transmitting properties.

8. A lighting system according to claim 1, 5 or 7.

13. The resin layer has a main surface opposite to the light distribution section side, The main surface of the resin layer is parallel to the main surface of the reflecting portion.

13. The lighting system of claim 12.

14. a light source unit including a laser light source; a light distribution unit separated from the light source unit, which converts incident light, which is a beam of light emitted from the light source unit into a target space, into illumination light and distributes the illumination light into the target space; a resin layer covering the light distribution section and having light transmissivity; an anti-reflective layer; The light distribution unit is A reflector that reflects the incident light toward the target space; A diffusion unit that diffuses the incident light toward the target space, the reflecting portion has a reflecting surface that reflects the incident light and a main surface opposite to the reflecting surface, When viewed from a direction perpendicular to the traveling direction of the incident light, the reflecting surface is inclined with respect to the main surface, The resin layer has a main surface opposite to the light distribution section side, the principal surface of the resin layer is parallel to the principal surface of the reflective portion, The anti-reflection layer covers the main surface of the resin layer opposite to the light distribution section side. Lighting system.

15. The beam of light emitted from the light source unit is white light.

15. A lighting system according to any one of claims 1, 5, 7 and 14.

16. The light source unit includes an optical fiber into which light from the laser light source is incident.

15. A lighting system according to any one of claims 1, 5, 7 and 14.

17. The light source unit includes a plurality of the laser light sources, the light source unit includes an optical fiber into which light from the plurality of laser light sources is incident, The plurality of laser light sources include A red semiconductor laser that emits red light; a green semiconductor laser that emits green light; A blue semiconductor laser that emits blue light.

15. A lighting system according to any one of claims 1, 5, 7 and 14.

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