Optical System

Abstract

The present invention addresses the problem of providing an optical system capable of performing optical wireless power feeding and providing illumination. An optical system (100) is provided with: a light source unit (1) that includes a laser light source (2); and a photoelectric conversion unit (7) that can generate optical photovoltaic power. The photoelectric conversion unit (7) generates optical photovoltaic power upon receiving power-feeding light (L3) that is emitted from the light source unit (1). The light source unit (1) is capable of emitting the power-feeding light (L3) for entry into the photoelectric conversion unit (7), and light (L1) for illuminating a space (S1) of interest.

Description

[Technical Field]

[0001] FIELD OF THE DISCLOSURE The present disclosure relates generally to optical systems, and more particularly to optical systems that include laser light sources. [Background technology]

[0002] Patent Document 1 discloses an optical wireless power supply system. The optical wireless power supply system disclosed in Patent Document 1 includes a light source unit and a light receiving unit. The light source unit has a laser light source. The light source unit outputs a light beam to a propagation region (space). The light receiving unit receives the light beam transmitted from the light source unit and propagated through the propagation region, and converts the light beam into electric power. The light receiving unit has a photoelectric conversion element for converting the light beam into electric power.

[0003] The optical wireless power supply system described in Patent Document 1 is used only for the purpose of supplying power wirelessly. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2020-99122 Summary of the Invention

[0005] An object of the present disclosure is to provide an optical system capable of performing optical wireless power supply and illumination.

[0006] An optical system according to one aspect of the present disclosure includes a light source unit including a laser light source and a photoelectric conversion unit capable of generating photovoltaic power. The photoelectric conversion unit generates photovoltaic power when it receives light for power supply emitted from the light source unit. The light source unit is capable of emitting light for power supply to be incident on the photoelectric conversion unit and light for illuminating a target space. The optical system further includes a light distribution unit and a holder. The light distribution unit reflects at least a portion of the illumination light to convert the at least a portion of the illumination light into illumination light having a light distribution characteristic different from the light distribution characteristic of the illumination light, and distributes the illumination light into the target space. The holder holds the photoelectric conversion unit and the light distribution unit. An optical system according to one aspect of the present disclosure includes a light source unit including a laser light source and a photoelectric conversion unit capable of generating photovoltaic power. The photoelectric conversion unit generates photovoltaic power when it receives light for power supply emitted from the light source unit. The light source unit is capable of emitting light for power supply to be incident on the photoelectric conversion unit and light for illuminating a target space. The optical system further includes a light distribution unit. The light distribution unit reflects at least a portion of the light for illumination, thereby converting the at least a portion of the light for illumination into illumination light having light distribution characteristics different from the light distribution characteristics of the light for illumination, and distributing the light into the target space. The light distribution unit overlaps the photoelectric conversion unit, and the light for power supply is incident on the photoelectric conversion unit through the light distribution unit. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a configuration diagram of an optical system according to the first embodiment. [Figure 2] FIG. 2 is a configuration diagram of a light source unit in the optical system. [Figure 3] 3A and 3B are explanatory diagrams of illumination light incident on a light distribution unit in the optical system of the same embodiment, illumination light distributed by the light distribution unit, and power supply light incident on a photoelectric conversion unit in the same embodiment. [Figure 4] Fig. 4A is an explanatory diagram of a light distribution angle of illumination light emitted from a light source unit in an optical system according to embodiment 2. Fig. 4B is an explanatory diagram of a light distribution angle of power supply light emitted from a light source unit in the same optical system. [Figure 5] 5A and 5B are explanatory diagrams of the beam sizes of illumination light emitted from the light source unit in the optical system of the above embodiment, respectively. [Figure 6] Fig. 6A is an explanatory diagram of illumination light emitted from a light source unit in an optical system according to embodiment 3. Fig. 6B is an explanatory diagram of power supply light emitted from a light source unit in the optical system according to embodiment 3. [Figure 7] FIG. 7 is a diagram illustrating the operation of the optical system according to the fourth embodiment. [Figure 8] Fig. 8A is an explanatory diagram of illumination light emitted from a light source unit in an optical system according to embodiment 5. Fig. 8B is an explanatory diagram of power supply light emitted from a light source unit in the optical system according to embodiment 5. [Figure 9] FIG. 9 is a cross-sectional view of a light distribution unit and a photoelectric conversion unit in an optical system according to a sixth embodiment. [Figure 10] FIG. 10 is a block diagram of an optical system according to the seventh embodiment. [Figure 11] FIG. 11 is a configuration diagram of an optical system according to the eighth embodiment. [Figure 12]Fig. 12A is an explanatory diagram of illumination light emitted from a light source unit in an optical system according to embodiment 9. Fig. 12B is an explanatory diagram of power supply light emitted from a light source unit in the optical system according to embodiment 9. DETAILED DESCRIPTION OF THE INVENTION

[0008] The drawings described in the following embodiments and the like are schematic drawings, and the ratios of the sizes and thicknesses of the components in the drawings do not necessarily reflect the actual dimensional ratios.

[0009] (Embodiment 1) An optical system 100 according to the first embodiment will be described below with reference to FIGS. 1, 2, 3A, and 3B.

[0010] (1) Overview The optical system 100 is a system that includes, for example, a light source unit 1 including a laser light source 2, and is used for optical wireless power supply and for illuminating a target space S1. The target space S1 is, for example, a space within a facility. The facility is, for example, an office building. The facility may also be, for example, a detached house, an apartment building, a store, a museum, a hotel, a factory, a stadium, an airport, etc.

[0011] (2) Optical system configuration As shown in FIG. 1, the optical system 100 includes a light source unit 1 and a photoelectric conversion unit 7. The light source unit 1 includes a laser light source 2. The photoelectric conversion unit 7 is capable of generating photovoltaic power. The photoelectric conversion unit 7 generates photovoltaic power when it receives power supply light L3 emitted from the light source unit 1. The light source unit 1 is capable of emitting power supply light L3 to be incident on the photoelectric conversion unit 7 and light L1 for illuminating the target space S1. The optical system 100 further includes a light distribution unit 8. The light distribution unit 8 reflects at least a portion of the illumination light L1 to convert at least a portion of the illumination light L1 into illumination light L2 having light distribution characteristics different from the light distribution characteristics of the illumination light L1, and distributes the light into the target space S1. The optical system 100 causes beam-shaped illumination light L1 (e.g., beam-shaped white light) emitted from the light source unit 1 to enter the light distribution unit 8 as incident light, and the incident light (illumination light L1) is converted into illumination light L2 in the light distribution unit 8 and output.

[0012] The optical system 100 further includes a holder 10 that holds the photoelectric conversion unit 7 and the light distribution unit 8. The optical system 100 further includes a control unit 9 that controls the light source unit 1. The control unit 9 has a function of controlling the light source unit 1 so that the light source unit 1 emits only the power supply light L3 out of the power supply light L3 and the illumination light L1, and a function of controlling the light source unit 1 so that the light source unit 1 emits only the illumination light L1 out of the power supply light L3 and the illumination light L1.

[0013] (2.1) Light source unit The light source unit 1 includes a laser light source 2. The laser light source 2 is, for example, a semiconductor laser that emits blue light Lb (see FIG. 2) as 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.

[0014] As shown in FIG. 2, the light source unit 1 further includes a wavelength conversion section 3, a lens 4, a mirror 5, and a housing 6 (see FIG. 1).

[0015] In the light source unit 1, blue light Lb emitted from the laser light source 2 is incident on the wavelength conversion unit 3. The wavelength conversion unit 3 has a function of converting the blue light Lb into white light Lw that includes light with a wavelength different from that of the blue light Lb.

[0016] The wavelength conversion unit 3 includes, for example, a translucent material portion and phosphor particles. In this case, the wavelength conversion unit 3 is formed of a mixture of the translucent material portion and phosphor particles. In the wavelength conversion unit 3, a large number of phosphor particles are present in the translucent material portion. The material of the translucent material portion (translucent material) is preferably a material with high transmittance to visible light. The translucent material is, for example, a silicone-based resin. This enables the light source unit 1 to improve the heat resistance and weather resistance of the wavelength conversion unit 3. Examples of the "silicone-based resin" include silicone resin and modified silicone resin. The wavelength conversion unit 3 has phosphor particles as a wavelength conversion element. The wavelength conversion element converts the wavelength of a portion of the blue light Lb and emits light with a wavelength different from that 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, Ce-activated YAlO 12 However, the present invention is not limited to this. The white light Lw emitted from the wavelength conversion unit 3 is a mixture of blue light Lb and yellow light.

[0017] Furthermore, the wavelength conversion unit 3 is not limited to including only yellow phosphor particles as wavelength conversion elements, but may also include, for example, yellow phosphor particles, yellow-green phosphor particles, green phosphor particles, and red phosphor particles, i.e., multiple types of phosphor particles.

[0018] The white light Lw emitted from the wavelength converting unit 3 is incoherent light.

[0019] The lens 4 is located on the opposite side of the wavelength conversion unit 3 from the laser light source 2 side. The lens 4 collimates the white light Lw emitted from the wavelength conversion unit 3.

[0020] The mirror 5 is a scanning mirror that can scan the projection direction of the white light Lw emitted from the lens 4. In the optical system 100 according to the first embodiment, the white light Lw reflected by the mirror 5 toward the light distribution unit 8 (see FIG. 1) is the illumination light L1, and the white light Lw reflected by the mirror 5 toward the photoelectric conversion unit 7 (see FIG. 1) is the power supply light L3. The mirror 5 is controlled by, for example, a control unit 9. The control unit 9 controls the mirror 5 so that the white light Lw emitted from the light source unit 1 becomes the illumination light L1 directed toward the light distribution unit 8 or the power supply light L3 directed toward the photoelectric conversion unit 7. The mirror 5 is, for example, a MEMS (Micro Electro Mechanical Systems) mirror, but is not limited thereto and may be, for example, a polygon mirror.

[0021] The housing 6 (see FIG. 1) houses the laser light source 2, the wavelength conversion unit 3, the lens 4, and the mirror 5. The housing 6 has an emission unit that projects the white light Lw into the target space S1 and is made of a light-transmitting material. The light-transmitting material is, for example, optical glass. The light-transmitting material is preferably a material that has a high transmittance for visible light. The emission unit in the housing may be an opening.

[0022] As shown in FIG. 1, for example, the light source unit 1 is disposed on the rear side of the second structure ST2 of a first structure ST1 and a second structure ST2 that partition a target space S1 in a facility. The first structure ST1 is the ceiling of the facility and includes a plurality of first building materials (ceiling materials) 12 facing the target space S1. Each of the plurality of first building materials 12 is in the form of a panel. The second structure ST2 is a wall within the facility and includes a plurality of second building materials 13 facing the target space S1 (only one second building material 13 is shown in FIG. 1). Each of the plurality of second building materials 13 is in the form of a panel. "Facing the target space S1" means being in contact with the target space S1. The first structure ST1 is in contact with the target space S1 and defines the boundary between the target space S1 and the space above the ceiling. The target space S1 is a space below the ceiling. The second structure ST2 is adjacent to the target space S1 and defines the boundary between the target space S1 and the space behind the wall. When a person 19 in the target space S1 looks at one of the multiple second building materials 13, the light source unit 1 is hidden by the second building material 13. In other words, the light source unit 1 is shielded by the second building material 13.

[0023] The light source unit 1 is disposed on the opposite side of the target space S1 in one of the second building materials 13, but is not limited to this and may be disposed within the one second building material 13. The one second building material 13 has a window 131 that passes the power supply light L3 and the illumination light L1 from the light source unit 1. The window 131 is an opening, but is not limited to this and may be a light-transmitting member.

[0024] The light source unit 1 is disposed in the second building material 13 at a position higher than a predetermined height (for example, 2 m) from the floor surface F1. The predetermined height is determined so that the emission portion of the housing 6 of the light source unit 1 is positioned at a position higher than the height from the floor surface F1 to the eyes of a person 19. The light source unit 1 is disposed so that the light L3 for power supply and the light L1 for illumination propagate upward (i.e., diagonally upward) rather than downward from the horizontal direction.

[0025] (2.2) Photoelectric conversion unit The photoelectric conversion unit 7 is separated from the light source unit 1. The photoelectric conversion unit 7 receives the beam-like light L3 for power supply emitted from the light source unit 1 into the target space S1 and generates photovoltaic power.

[0026] The photoelectric conversion unit 7 includes, for example, a solar cell. The solar cell is, for example, a Si-based solar cell (a-Si:H / c-Si heterojunction solar cell). The Si-based solar cell includes, for example, a substrate having a first main surface and a second main surface opposite to the first main surface. The substrate is an n-type single-crystalline silicon substrate. The first main surface of the substrate includes a first texture structure. The second main surface of the substrate includes a second texture structure. The Si-based solar cell includes a first i-type (intrinsic type) hydrogenated amorphous silicon layer (hereinafter also referred to as an a-Si:H layer) formed on the first main surface of the substrate, a p-type a-Si:H layer formed on the first i-type a-Si:H layer, a second i-type a-Si:H layer formed on the second main surface of the substrate, and an n-type a-Si:H layer formed on the second i-type a-Si:H layer. The Si-based solar cell includes a first transparent electrode formed on a p-type a-Si:H layer, a first collecting electrode formed on the first transparent electrode, a second transparent electrode formed on an n-type a-Si:H layer, and a second collecting electrode formed on the second transparent electrode. The first texture structure and the second texture structure are minute irregularities formed for the purpose of reducing surface reflection loss and increasing light absorption through a light trapping effect. The material of each of the first transparent electrode and the second transparent electrode is a transparent conductive oxide. The solar cell is not limited to a Si-based solar cell, and may be other types of solar cells. The photoelectric conversion unit 7 is panel-shaped and has a light incident surface 71 that intersects with the thickness direction of the photoelectric conversion unit 7. The photoelectric conversion unit 7 is arranged so that the light incident surface 71 faces the target space S1.

[0027] When the light L3 for power supply is incident on the light incident surface 71, the photoelectric conversion unit 7 generates a photovoltaic power.

[0028] (2.3) Light distribution section The light distribution unit 8 is separated from the light source unit 1. The light distribution unit 8 has a function of reflecting the illumination light L1, which is a beam of light emitted from the light source unit 1. The light distribution unit 8 converts the illumination light L1 into illumination light L2, which has a light distribution characteristic different from that of the illumination light L1, and distributes the converted light into the target space S1. Here, the illumination light L2 has a light distribution characteristic with lower directivity than the illumination light L1. In other words, the illumination light L2 has a larger luminous flux spread angle than the illumination light L1. In other words, the illumination light L2 has a larger light distribution distribution than the illumination light L1. The light distribution unit 8 converts the illumination light L1 into illumination light L2, which is distributed into the target space S1, by diffusing and reflecting the illumination light L1. It is preferable that the light distribution unit 8 have a high diffuse reflectance characteristic. This allows the light distribution unit 8 to have low light absorption and high diffusion. White is an example of a suitable color for the light distribution unit 8. Furthermore, the light distribution section 8 is preferably made of a non-glossy material rather than a glossy material, in other words, a material with high diffuse reflectance but low regular reflectance.

[0029] The light distribution unit 8 has a first function, a second function, and a third function. The first function is to reflect the illumination light L1 toward the target space S1. The second function is to convert the illumination light L1 into illumination light L2. The third function is to output the illumination light L2 toward the target space S1. The illumination light L2 is light with relatively low coherence (incoherent light) compared to the illumination light L1.

[0030] In the facility, a table Ta1 to be used by people 19 and the like who use the facility is installed below the light distribution unit 8 on the floor F1.

[0031] The light distribution unit 8 may have a reflecting unit that reflects the illumination light L1 toward the target space S1 and a diffusing unit that diffuses the illumination light L1 toward the target space S1. In this case, the reflecting unit is, for example, a reflective layer. The material of the reflecting layer includes, for example, a metal. The metal is, for example, aluminum or an aluminum alloy. The diffusing unit is, for example, a transmissive diffuser plate. The material of the diffusing unit is, for example, polycarbonate, polyester, acrylic, glass, or quartz. The diffusing unit is plate-shaped and has a first main surface on the reflecting unit side and a second main surface on the opposite side from the reflecting unit side. The diffusing unit is disposed so that the second main surface of the diffusing unit is in contact with the target space S1. The second main surface of the diffusing unit has an uneven structure. The uneven structure includes multiple curved surfaces that are randomly formed. The diffusing unit has multiple microlenses corresponding to the multiple curved surfaces. Each of the multiple curved surfaces functions as a light exit surface of the microlens. Therefore, the diffusing section can be said to be a microlens array in which multiple microlenses are randomly integrated. The shape of the uneven structure is determined based on the desired light distribution angle of the illumination light L2. The diffusing section diffuses the illumination light L1 reflected by the reflecting section through the refraction and diffraction effects of the uneven structure. The diffusing section is formed, for example, by a lens diffuser (LSD: Light Shaping Diffusers). In the light distribution section 8, the light distribution angle of the illumination light L2 is determined by the uneven structure of the diffusing section.

[0032] (2.4) Holder 1, the holder 10 holds the photoelectric conversion section 7 and the light distribution section 8. Here, the photoelectric conversion section 7 and the light distribution section 8 are adjacent to each other.

[0033] The support 10 forms, for example, a part of the first structure ST1 facing the target space S1. In this case, the support 10 includes a ceiling material 11 facing the target space S1. The support 10 is, for example, arranged next to at least one of the multiple first building materials 12. The ceiling material 11 is panel-shaped. The ceiling material 11 has a square shape when viewed from the thickness direction of the ceiling material 11, but is not limited to this and may also have a rectangular shape. In this specification, "when viewed from the thickness direction of the ceiling material" means, for example, viewing the ceiling material 11 from the target space S1 in the thickness direction of the ceiling material 11. The size of the ceiling material 11 is the same as that of the first building material 12, but may be different sizes. Like the first building material 12, the ceiling material 11 is supported by a grid-shaped support member of a system ceiling that constitutes the ceiling. The support member is formed, for example, using multiple zinc steel plates or the like.

[0034] Each of the ceiling material 11 and the first building material 12 is, for example, decorative plywood or decorative board. Examples of decorative plywood include natural wood decorative plywood and specially processed decorative board. Examples of specially processed decorative board include synthetic resin decorative board, printed plywood, PVC decorative plywood, and paper / cloth overlay plywood. Examples of decorative board include MDF (medium density fiberboard), Dilite, rock wool board, calcium silicate board, and insulation board.

[0035] (2.5) Control Unit The control unit 9 controls the light source unit 1. The control unit 9 has a function of controlling the light source unit 1 so that the light source unit 1 emits only the power supply light L3 out of the power supply light L3 and the illumination light L1, and a function of controlling the light source unit 1 so that the light source unit 1 emits only the illumination light L1 out of the power supply light L3 and the illumination light L1. The control unit 9 controls the scanning angle of the mirror 5 of the light source unit 1 to change the emission direction of the white light Lw, thereby emitting the white light Lw as the power supply light L3 or the illumination light L1. Therefore, in the optical system 100, the power supply light L3 and the illumination light L1 have different emission directions.

[0036] The control unit 9 includes a computer system. The computer system is primarily composed of a processor and memory as hardware. The functions of the control unit 9 are realized by the processor executing a program stored in the computer system's memory. The program may be pre-stored in the computer system's memory, provided via a telecommunications line, or provided on a non-transitory recording medium such as a memory card, optical disk, or hard disk drive that is readable by the computer system. The processor of the computer system is composed of one or more electronic circuits, including a semiconductor integrated circuit (IC) or a large-scale integrated circuit (LSI). The IC or LSI referred to here is referred to by different names depending on the degree of integration, and includes integrated circuits called system LSI, VLSI (Very Large Scale Integration), or ULSI (Ultra Large Scale Integration). Furthermore, a field-programmable gate array (FPGA), which is programmable after the LSI is manufactured, or a logic device capable of reconfiguring the connections within the LSI or the circuit partitions within the LSI, can also be used as a processor. Multiple electronic circuits may be integrated on a single chip or distributed across multiple chips. The multiple chips may be integrated into one device or distributed across multiple devices. The computer system referred to here includes a microcontroller having one or more processors and one or more memories. Therefore, the microcontroller also comprises one or more electronic circuits, including semiconductor integrated circuits or large-scale integrated circuits.

[0037] (2.6) Other Components of the Optical System The optical system 100 may further include a power supply unit. The power supply unit supplies power to the laser light source 2 and the like. The power supply unit includes a drive circuit that drives the laser light source 2. The drive circuit is controlled, for example, by the control unit 9 described above. In the optical system 100, the control unit 9 controls the drive circuit, thereby adjusting the optical output of the laser light source 2 and making it possible to adjust the illuminance (brightness) of the illumination light L2. The power supply unit is housed within the housing 6 of the light source unit 1, but is not limited to this, and may not be housed within the housing 6. The power supply unit is supplied with a power supply voltage, for example, from an external power source via an electric wire.

[0038] The optical system 100 may also include a power supply unit including a storage battery that stores electricity using the output of the photoelectric conversion unit 7. The optical system 100 may also include a communication unit that communicates information about the state of the storage battery to the control unit 9. In this case, for example, when the light source unit 1 is emitting power supply light L3, the control unit 9 may stop emitting power supply light L3 if the information received from the communication unit includes information indicating that the storage battery is fully charged.

[0039] (3) Operation of the optical system The optical system 100 emits blue light Lb from the laser light source 2 of the light source unit 1. In the light source unit 1 of the optical system 100, the blue light Lb from the laser light source 2 is incident on the wavelength conversion unit 3, where a portion of the blue light Lb is converted into yellow light. As a result, in the light source unit 1 of the optical system 100, the blue light Lb emitted from the laser light source 2 is converted into white light Lw by the wavelength conversion unit 3. The light source unit 1 collimates the white light Lw emitted from the wavelength conversion unit 3 with a lens 4, and projects the collimated white light Lw into the target space S1 by reflecting it with a mirror 5. The white light Lw emitted from the light source unit 1 passes through the target space S1 and is incident on the photoelectric conversion unit 7 or the light distribution unit 8. The photoelectric conversion unit 7 generates photovoltaic power when it receives the power supply light L3. The light distribution unit 8 reflects the illumination light L1 and outputs illumination light L2, which has light distribution characteristics different from those of the illumination light L1, to the target space S1. The illumination light L2 is incoherent light with low directivity. When the control unit 9 causes the light source unit 1 to emit the illumination light L1, as shown in FIG. 3A, the illumination light L1 enters the light distribution unit 8, which is one of the photoelectric conversion unit 7 and the light distribution unit 8, and the illumination light L1 is converted into illumination light L2 in the light distribution unit 8. When the control unit 9 causes the light source unit 1 to emit only the power supply light L3, as shown in FIG. 3B, the power supply light L3 enters the photoelectric conversion unit 7, which is one of the photoelectric conversion unit 7 and the light distribution unit 8, and the photoelectric conversion unit 7 generates photovoltaic power. Therefore, even when the target space S1 is not illuminated, it is possible to generate photovoltaic power in the photoelectric conversion unit 7. In the optical system 100 according to the first embodiment, the illumination light L1 and the power supply light L3 are emitted in different directions from the light source unit 1, but the spectrum of the illumination light L1 and the spectrum of the power supply light L3 are the same, and the beam diameter of the illumination light L1 and the beam diameter of the power supply light L3 are the same.

[0040] (4) Summary The optical system 100 according to the first embodiment includes a light source unit 1 including a laser light source 2, and a photoelectric conversion unit 7 capable of generating photovoltaic power. The photoelectric conversion unit 7 generates photovoltaic power when it receives power supply light L3 emitted from the light source unit 1. The light source unit 1 can emit power supply light L3 to be incident on the photoelectric conversion unit 7, and light L1 for illuminating the target space S1.

[0041] The optical system 100 according to the first embodiment enables optical wireless power supply and illumination. More specifically, according to the optical system 100 according to the first embodiment, when the light source unit 1 emits light L3 for power supply, photovoltaic power can be generated in the photoelectric conversion unit 7, so that optical wireless power supply can be performed, and when the light source unit 1 emits light L1 for illumination, illumination can be performed.

[0042] The optical system 100 according to the first embodiment further includes a light distribution unit 8. The light distribution unit 8 reflects at least a portion of the illumination light L1, converting the illumination light L1 into illumination light L2 having a different light distribution characteristic from that of the illumination light L1, and distributing the converted illumination light into the target space S1. This allows the optical system 100 according to the first embodiment to provide the illumination light L2 with a light distribution control in the target space S1 without using a lighting fixture. The optical system 100 according to the first embodiment uses highly directional light (beam-shaped light suitable for long-distance spatial propagation) as the illumination light L1. In the optical system 100, the illumination light L2 converted and distributed by the light distribution unit 8 has relatively lower directivity and coherence than the illumination light L1, making it suitable for illumination. In addition, the optical system 100 uses a laser light source 2 as a light source, thereby increasing the directivity of the illumination light L1 and allowing the light source to be located farther from the ceiling.

[0043] Moreover, the optical system 100 according to the first embodiment further includes a holder 10 that holds the photoelectric conversion unit 7 and the light distribution unit 8. This makes it possible for the optical system 100 according to the first embodiment to determine the relative positional relationship between the photoelectric conversion unit 7 and the light distribution unit 8 by the holder 10.

[0044] Furthermore, in the optical system 100 according to the first embodiment, the photoelectric conversion unit 7 and the light distribution unit 8 are adjacent to each other. As a result, the optical system 100 according to the first embodiment can reduce the angle formed between the emission direction of the power supply light L3 and the emission direction of the illumination light L1, compared to a case in which the photoelectric conversion unit 7 and the light distribution unit 8 are separated from each other and another member is disposed between them.

[0045] Furthermore, in the optical system 100 according to the first embodiment, the holder 10 includes a ceiling material 11 facing the target space S1. This allows the optical system 100 according to the first embodiment to have the advantage that the target space S1 can be easily illuminated with the illumination light L2, and the illumination by the illumination light L2 tends to be natural illumination that does not feel strange to the person 19.

[0046] The optical system 100 according to the first embodiment further includes a control unit 9 that controls the light source unit 1. The control unit 9 has a function of controlling the light source unit 1 so that the light source unit 1 emits only the power supply light L3 out of the power supply light L3 and the illumination light L1, and a function of controlling the light source unit 1 so that the light source unit 1 emits only the illumination light L1 out of the power supply light L3 and the illumination light L1. This makes it possible for the optical system 100 according to the first embodiment to switch between control of the light source unit 1 to emit only the power supply light L3 and control of the light source unit 1 to emit only the illumination light L1, and to perform the control of the light source unit 1 to emit only the power supply light L3 and the control of the light source unit 1 to emit only the illumination light L1 at different time periods.

[0047] In the optical system 100 according to the first embodiment, the power supply light L3 and the illumination light L1 are emitted in different directions. This allows the optical system 100 according to the first embodiment to emit the power supply light L3 and the illumination light L1 from the light source unit 1 in suitable light.

[0048] (Embodiment 2) The optical system 100 according to the second embodiment includes a light source unit 1a (see FIGS. 4A and 4B) instead of the light source unit 1. The basic configuration of the optical system 100 according to the second embodiment is the same as that of the optical system 100 according to the first embodiment, and therefore will not be illustrated or described again.

[0049] The light source unit 1a does not include the mirror 5 of the light source unit 1 (see FIG. 2). The light source unit 1a can make the luminous intensity distribution angle θ1 of the illumination light L1 and the luminous intensity distribution angle θ3 of the power supply light L3 different from each other. The light source unit 1a is configured to be able to change the distance between the wavelength converter 3 and the lens 4a in the direction along the optical axis of the lens 4a. Therefore, as shown in FIGS. 4A and 4B, the light source unit 1a can make the luminous intensity distribution angle θ1 of the illumination light L1 and the luminous intensity distribution angle θ3 of the power supply light L3 different from each other by changing the distance between the wavelength converter 3 and the lens 4a in the direction along the optical axis of the lens 4a. The light source unit 1a includes a movable mechanism that changes the distance between the wavelength converter 3 and the lens 4a.

[0050] In the light source unit 1a, the light distribution angle θ3 of the power supply light L3 and the light distribution angle θ1 of the illumination light L1 are different from each other. The light distribution angle θ1 of the illumination light L1 is larger than the light distribution angle θ3 of the power supply light L3. In other words, the light distribution angle θ3 of the power supply light L3 is smaller than the light distribution angle θ1 of the illumination light L1. In the optical system 100 according to the second embodiment, the power supply light L3 and the illumination light L1 have different light distribution angles from each other. This makes it possible for the optical system 100 according to the second embodiment to emit the power supply light L3 and the illumination light L1 from the light source unit 1a as light appropriate for each.

[0051] In the optical system 100 according to the second embodiment, the luminous intensity distribution angle θ1 of the illumination light L1 is larger than the luminous intensity distribution angle θ3 of the power supply light L3. Therefore, as shown in FIGS. 5A and 5B, the illumination range of the illumination light L1 can be made wider than the illumination range of the power supply light L3. Therefore, in the optical system 100 according to the second embodiment, as shown in FIG. 5A, the illumination light L1 can be made incident not only on the light distribution unit 8 but also on the photoelectric conversion unit 7 (incident on both the light distribution unit 8 and the photoelectric conversion unit 7). This makes it possible for the optical system 100 according to the second embodiment to generate photovoltaic power in the photoelectric conversion unit 7 by utilizing a portion of the illumination light L1. Therefore, the optical system 100 according to the second embodiment can generate photovoltaic power in the photoelectric conversion unit 7 even when the target space S1 is illuminated with the illumination light L2.

[0052] (Modification of the second embodiment) In the optical system 100 according to the second embodiment, the light distribution angle θ1 of the illumination light L1 is larger than the light distribution angle θ3 of the power supply light L3, but in a modification of the second embodiment, in a configuration similar to that of the optical system 100 according to the second embodiment, the light distribution angle θ3 of the power supply light L3 is larger than the light distribution angle θ1 of the illumination light L1. In this case, it is possible to make the power supply light L3 incident not only on the photoelectric conversion unit 7 but also on the light distribution unit 8 (to make it incident on both the photoelectric conversion unit 7 and the light distribution unit 8). As a result, in the modification of the second embodiment, it is possible to generate illumination light L2 by utilizing a part of the power supply light L3.

[0053] (Embodiment 3) The optical system 100 according to the third embodiment includes a light source unit 1b (see FIGS. 6A and 6B) instead of the light source unit 1. The basic configuration of the optical system 100 according to the third embodiment is the same as that of the optical system 100 according to the first embodiment, and therefore will not be illustrated or described again.

[0054] Light source unit 1b includes a plurality of (three) 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 light source unit 1b, red light Lr, green light Lg, and blue light Lb are emitted from a housing that houses the three laser light sources 2. The light emitted from the light emitting portion of light source unit 1b is white light Lw that is a mixture of red light Lr, green light Lg, and blue light Lb.

[0055] 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. The housing contains the three laser light sources 2R, 2G, and 2B and the three mirrors 25R, 25G, and 25B. The mirror 25B reflects the blue light Lb from the laser light source 2B toward the mirror 25G. The mirror 25G is a dichroic mirror that reflects the green light Lg from the laser light source 2G toward the mirror 25R and transmits the blue light Lb from the mirror 25B. The mirror 25R is a dichroic mirror that transmits the red light Lr from the laser light source 2R and reflects the blue light Lb and green light Lg from the mirror 25G.

[0056] In the light source unit 1b, the three laser light sources 2 and the light emitting portion of the housing are optically coupled by three mirrors 25R, 25G, and 25B.

[0057] The light source unit 1b may be configured to include a collimating lens that collimates the white light Lw, and to emit the white light Lw collimated by the collimating lens into the target space S1.

[0058] The optical system 100 according to the third embodiment includes three drive circuits corresponding one-to-one to the three laser light sources 2R, 2G, and 2B. In the optical system 100 according to the third embodiment, a control unit 9 (see FIG. 1) controls the three drive circuits individually. This makes it possible to control the output ratio of the three laser light sources 2R, 2G, and 2B in the optical system 100 according to the third embodiment. Therefore, in the optical system 100 according to the third embodiment, it is possible to make the spectrum of the power supply light L3 and the spectrum of the illumination light L1 different from each other. In the power supply light L3 shown in FIG. 6B, the outputs of the blue light Lb and the green light Lg are reduced and the output of the red light Lr is increased compared to the illumination light L1 shown in FIG. 6A, thereby making the spectrum of the power supply light L3 and the spectrum of the illumination light L1 different. 6A and 6B, the magnitude of the optical output of each of the blue light Lb, green light Lg, and red light Lr is schematically shown by the magnitude of the linewidth of each of the blue light Lb, green light Lg, and red light Lr. The light with a wavelength that increases the optical output of the power supply light L3 is preferably light included in a wavelength range that is highly efficient in the photoelectric conversion unit 7.

[0059] In the optical system 100 according to the third embodiment, as shown in FIG. 7 , it is possible to make the illumination light L1 incident not only on the light distribution unit 8 but also on the photoelectric conversion unit 7 (to be incident on both the light distribution unit 8 and the photoelectric conversion unit 7). As a result, in the optical system 100 according to the third embodiment, it is possible to generate photovoltaic power in the photoelectric conversion unit 7 by using a part of the illumination light L1. Therefore, the optical system 100 according to the third embodiment can generate photovoltaic power in the photoelectric conversion unit 7 even when the target space S1 is illuminated by the illumination light L2. In the optical system 100 according to the third embodiment, the power supply light L3 is also incident on both the photoelectric conversion unit 7 and the light distribution unit 8.

[0060] The optical system 100 according to the third embodiment may further include a mirror 5 (see FIG. 2) that changes the emission direction of the white light Lw, similar to the optical system 100 according to the first embodiment.

[0061] The light source unit 1b includes three laser light sources 2, but is not limited to this and may include four or more laser light sources 2 that emit light of different colors. This makes it possible for the optical system 100 to improve the color rendering properties of the light (white light Lw) emitted from the light emitting portion of the light source unit 1b.

[0062] (Embodiment 4) The optical system 100 according to the fourth embodiment includes a light source unit 1c (see FIGS. 8A and 8B) instead of the light source unit 1. The basic configuration of the optical system 100 according to the fourth embodiment is the same as that of the optical system 100 according to the first embodiment, and therefore will not be illustrated or described again.

[0063] As shown in FIGS. 8A and 8B , the light source unit 1c includes two laser light sources 2. In addition, in the light source unit 1c, a wavelength conversion unit 3 is disposed on the optical axis of the first laser light source 21 of the two laser light sources 2, whereas the wavelength conversion unit 3 is not disposed on the optical axis of the second laser light source 22. Each of the first laser light source 21 and the second laser light source 22 emits blue light Lb. The wavelength conversion unit 3 converts the blue light Lb from the first laser light source 21 into yellow light Ly and emits it. The light source unit 1c has a collimating lens that collimates the blue light Lb that does not pass through the wavelength conversion unit 3 and the yellow light emitted from the wavelength conversion unit 3, and is configured to emit white light Lw collimated by the collimating lens into the target space S1.

[0064] The optical system 100 according to the fourth embodiment includes two driving circuits corresponding one-to-one to the two laser light sources 2. In the optical system 100 according to the fourth embodiment, the control unit 9 (see FIG. 1) controls the two driving circuits individually. This makes it possible to control the output ratio of the two laser light sources 2 in the optical system 100 according to the fourth embodiment. Therefore, in the optical system 100 according to the fourth embodiment, it is possible to make the spectrum of the power supply light L3 and the spectrum of the illumination light L1 different from each other. In the power supply light L3 shown in FIG. 8B, the output of the first laser light source 21 is reduced and the output of the second laser light source 22 is increased compared to the illumination light L1 shown in FIG. 8A, thereby making the spectrum of the power supply light L3 and the spectrum of the illumination light L1 different from each other. In FIGS. 8A and 8B, the magnitude of the optical output of the blue light Lb and the yellow light Ly is schematically shown by the magnitude of the linewidth of each of the blue light Lb and the yellow light Ly. The wavelength of the power supply light L3 that increases the optical output is preferably light included in a wavelength range in which the photoelectric conversion section 7 is highly efficient.

[0065] In the optical system 100 according to the fourth embodiment, similarly to the optical system 100 according to the third embodiment, it is possible to make the illumination light L1 incident not only on the light distribution unit 8 but also on the photoelectric conversion unit 7 (to make it incident on both the light distribution unit 8 and the photoelectric conversion unit 7). This makes it possible for the optical system 100 according to the fourth embodiment to generate photovoltaic power in the photoelectric conversion unit 7 by using a part of the illumination light L1. Therefore, the optical system 100 according to the fourth embodiment makes it possible to generate photovoltaic power in the photoelectric conversion unit 7 even when the target space S1 is illuminated by the illumination light L2.

[0066] The optical system 100 according to the fourth embodiment may further include a mirror 5 (see FIG. 2) that changes the emission direction of the white light Lw, similar to the optical system 100 according to the first embodiment.

[0067] (Embodiment 5) 9, the optical system 100 according to the fifth embodiment differs from the optical system 100 according to the first embodiment in that the photoelectric conversion unit 7 and the light distribution unit 8 are stacked. The basic configuration of the optical system 100 according to the fifth embodiment is the same as that of the optical system 100 according to the first embodiment, and therefore illustration and description thereof will be omitted.

[0068] In the optical system 100 according to the fifth embodiment, the light distribution unit 8 overlaps the photoelectric conversion unit 7. The light distribution unit 8 is disposed on the light incident surface 71 of the photoelectric conversion unit 7. In the optical system 100 according to the fifth embodiment, the light distribution unit 8 and the photoelectric conversion unit 7 are disposed such that the light distribution unit 8 contacts the target space S1.

[0069] In the optical system 100 according to the fifth embodiment, the power supply light L3 is incident on the photoelectric conversion unit 7 through the light distribution unit 8. That is, in the optical system 100 according to the fifth embodiment, the reflectance of the light distribution unit 8 is determined so that only a portion of the illumination light L1 incident on the light incident surface 81 of the light distribution unit 8 is diffusely reflected by the light distribution unit 8 and emitted into the target space S1 as illumination light L2, and at least a portion of the remaining illumination light L1 incident on the light incident surface 81 of the light distribution unit 8 passes through the light distribution unit 8 and reaches the photoelectric conversion unit 7 as power supply light L3. The optical system 100 according to the fifth embodiment can make the emission direction of the power supply light L3 the same as the emission direction of the illumination light L1. Furthermore, the optical system 100 according to the fifth embodiment can reduce the area occupied by components including the light distribution unit 8 and the photoelectric conversion unit 7 when viewed from the target space S1, thereby improving the design.

[0070] (Embodiment 6) 10, the optical system 100 according to the sixth embodiment differs from the optical system 100 according to the first embodiment in that it includes a sensor 20 that receives power supply from a photoelectric conversion unit 7. In the optical system 100 according to the sixth embodiment, the same components as those in the optical system 100 according to the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0071] The optical system 100 of embodiment 6 includes a light source unit 1, a photoelectric conversion unit 7, a light distribution unit 8, a first control unit 9 which is a control unit 9 that controls the light source unit 1, a secondary battery 15, a bidirectional converter 14 that performs power conversion between the photoelectric conversion unit 7 and the secondary battery 15, a transmitter 17, a receiver 18, a sensor 20, and a second control unit 16.

[0072] The sensor 20 is, for example, a human presence sensor that detects a person 19 (see Figure 1) in the target space S1 (see Figure 1), but is not limited to this and may be, for example, a smoke detection sensor that detects smoke in the target space S1.

[0073] The second control unit 16 causes the transmitter 17 to transmit a control signal based on the detection result of the sensor 20. The receiver 18 receives the control signal from the transmitter 17 and transmits it to the first control unit 9. This allows the first control unit 9 to control the light source unit 1 in accordance with the detection result of the sensor 20.

[0074] The optical system 100 of the sixth embodiment has the advantage that there is no need to supply power to the sensor 20 installed on the ceiling of the facility or the like from an external wire (electric wire), and there is no need to provide a battery that needs to be replaced, such as a primary battery.

[0075] In the optical system 100, the photovoltaic power generated in the photoelectric conversion unit 7 may be supplied directly to the sensor 20 without going through the secondary battery 15.

[0076] (Embodiment 7) The optical system 100 according to the seventh embodiment includes a holder 10a (see FIG. 11) instead of the holder 10 (see FIG. 1) in the optical system 100 according to the first embodiment. The holder 10a is a moving body 101. The basic configuration of the optical system 100 according to the seventh embodiment is the same as that of the optical system 100 according to the first embodiment, and therefore illustrations and explanations thereof will be omitted.

[0077] The mobile object 101 constituting the holding body 10a is, for example, a drone, which is a type of flying object. The drone operates by remote control using a management terminal. The management terminal is, for example, a personal computer or a server.

[0078] In the optical system 100 according to the seventh embodiment, when the moving object 101 is stopped, the light source unit 1 emits light L3 for power supply toward the photoelectric conversion unit 7. The electromotive force generated in the photoelectric conversion unit 7 is used, for example, to charge a secondary battery that serves as a power source for the moving object 101. In the optical system 100 according to the seventh embodiment, the light source unit 1 may further emit light L3 for power supply toward the photoelectric conversion unit 7 while the moving object 101 is moving (while the drone is flying), thereby charging the secondary battery that serves as a power source for the moving object 101. In this way, in the optical system 100 according to the seventh embodiment, the flying drone is powered while being illuminated with illumination light L2, thereby making it possible to extend the flight time of the drone that provides illumination.

[0079] The mobile object 101 has a main body 102, a plurality of (for example, four) propellers 110, a plurality of (for example, four) drive units (for example, motors) that drive the plurality of propellers 110, a control device that controls the plurality of drive units, a plurality of (for example, four) legs 111, a holding arm 112 that holds a photoelectric conversion unit 7, and a holding arm 113 that holds a light distribution unit 8. The mobile object 101 also has a camera, a GPS sensor, a gyro sensor, an acceleration sensor, an electronic compass, a wireless communication unit, and the like.

[0080] The optical system 100 according to the seventh embodiment enables optical wireless power supply to the moving body 101, and also makes it possible to change the illumination area by the illumination light L2 by causing the illumination light L1 to be incident on the light distribution unit 8 after the moving body 101 to a desired position or while the moving body 101 is moving.

[0081] (Embodiment 8) 12A and 12B, the optical system 100 according to the eighth embodiment differs from the optical system 100 according to the first embodiment in that it includes a light source unit 1d instead of the light source unit 1 (see FIGS. 1 and 2) in the optical system 100 according to the first embodiment. In the optical system 100 according to the eighth embodiment, the same components as those in the optical system 100 according to the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0082] The light source unit 1d does not have the mirror 5 of the light source unit 1 (see FIG. 2). The light source unit 1d also includes an optical fiber 120 that propagates white light Lw (see FIG. 2) collimated by a lens 4, and an output unit 130 that outputs the white light Lw propagated by the optical fiber 120 to the target space S1. The output unit 130 has a function of outputting illumination light L1 as illumination light L2 as shown in FIG. 12A and a function of outputting power supply light L3 to the target space S1 as shown in FIG. 12B. The output unit 130 includes a lens facing the light output surface of the optical fiber 120. By changing the distance between the light output surface of the optical fiber 120 and the lens, the luminous intensity distribution angle θ1 of the illumination light L1 and the luminous intensity distribution angle θ3 of the power supply light L3 can be made different. It is also possible to set the luminous intensity distribution angle θ1 of the illumination light L1 to the luminous intensity distribution angle θ2 of the illumination light L2. In the optical system 100 according to the eighth embodiment, the photoelectric conversion unit 7 (FIG. 12B) is placed, for example, on a table Ta1 used by a person 19 who uses a facility when the person 19 is not using the table.

[0083] In addition, the emission unit 130 includes a mirror that reflects the light emitted from the light emission surface of the optical fiber 120, and by controlling the scanning angle of the mirror, it is possible to make the emission direction of the illumination light L2 different from the emission direction of the power supply light L3.

[0084] In the optical system 100 according to the eighth embodiment, the light source unit 1d has a function of emitting power supply light L3 to the target space S1 and a function of emitting illumination light L1 to the target space S1 as illumination light L2. This allows the optical system 100 according to the eighth embodiment to directly illuminate the target space S1 using the light source unit 1d.

[0085] (Other variations) The above-described first to eighth embodiments are merely examples of various embodiments of the present disclosure. The above-described first to eighth embodiments can be modified in various ways depending on the design and the like, as long as the object of the present disclosure can be achieved.

[0086] For example, in the optical system 100 according to the first embodiment, the holder 10 is not limited to including the ceiling material 11, and may include, for example, a beam.

[0087] Furthermore, in the optical system 100 according to the first embodiment, 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, the wavelength conversion unit 3 preferably includes blue phosphor particles, yellow phosphor particles, green phosphor particles, and red phosphor particles. The blue phosphor particles are excited by, for example, purple laser light to emit blue light. The yellow phosphor particles are excited by, for example, purple laser light to emit yellow light. The green phosphor particles are excited by, for example, purple laser light to emit green light. The red phosphor particles are excited by, for example, purple laser light to emit red light.

[0088] Furthermore, in the optical system 100 according to the first embodiment, the shortest distance between the photoelectric conversion unit 7 and the light source unit 1 is shorter than the shortest distance between the light distribution unit 8 and the light source unit 1, but this is not limited to this. For example, the shortest distance between the light distribution unit 8 and the light source unit 1 may be shorter than the shortest distance between the photoelectric conversion unit 7 and the light source unit 1, or the shortest distance between the light distribution unit 8 and the light source unit 1 may be the same as the shortest distance between the photoelectric conversion unit 7 and the light source unit 1.

[0089] In the optical system 100 according to the first embodiment, the control unit 9 may control the light source unit 1 according to a preset schedule.

[0090] (Aspect) Based on the above-described embodiments, the present specification discloses the following aspects.

[0091] The optical system (100) according to the first aspect includes light source units (1; 1a; 1b; 1c; 1d) including a laser light source (2), and a photoelectric conversion unit (7) capable of generating photovoltaic power. The photoelectric conversion unit (7) generates photovoltaic power when it receives light (L3) for power supply emitted from the light source units (1; 1a; 1b; 1c; 1d). The light source units (1; 1a; 1b; 1c; 1d) are capable of emitting the light (L3) for power supply to be incident on the photoelectric conversion unit (7) and light (L1) for illuminating a target space (S1).

[0092] The optical system (100) according to the first aspect is capable of optical wireless power supply and illumination.

[0093] The optical system 100 according to the second aspect is the same as the first aspect, and further includes a light distribution unit (8). The light distribution unit (8) reflects at least a part of the illumination light (L1) to convert the at least a part of the illumination light (L1) into illumination light (L2) having a light distribution characteristic different from the light distribution characteristic of the illumination light (L1), and distributes the light into the target space (S1).

[0094] The optical system (100) according to the second aspect can provide illumination light (L2) with light distribution control to the target space (S1) without using any lighting fixtures.

[0095] The optical system (100) according to the third aspect is the optical system of the second aspect, further comprising a holder (10; 10a) that holds the photoelectric conversion unit (7) and the light distribution unit (8).

[0096] In the optical system (100) according to the third aspect, the relative positional relationship between the photoelectric conversion unit (7) and the light distribution unit (8) can be determined by the holder (10; 10a).

[0097] In the optical system (100) according to the fourth aspect, the photoelectric conversion unit (7) and the light distribution unit (8) are adjacent to each other in the third aspect.

[0098] The optical system (100) according to the fourth aspect makes it possible to reduce the angle between the emission direction of the power supply light (L3) and the emission direction of the illumination light (L1) compared to when the photoelectric conversion unit (7) and the light distribution unit (8) are separated and other components are arranged between the photoelectric conversion unit (7) and the light distribution unit (8).

[0099] In the optical system (100) according to the fifth aspect, in the third or fourth aspect, the holder (10) includes a ceiling material (11) facing the target space (S1).

[0100] The light system (100) according to the fifth aspect has an advantage that the illumination light (L2) can easily illuminate the target space (S1) and can easily provide natural lighting that is not perceived as strange by the person (19).

[0101] In the optical system (100) according to the sixth aspect, in the third or fourth aspect, the holder (10a) is a moving body (101).

[0102] The optical system (100) according to the sixth aspect enables optical wireless power supply to a moving body (101), and also makes it possible to change the illumination area of ​​the illumination light (L2) by moving the moving body (101).

[0103] In the optical system (100) according to the seventh aspect, in the second aspect, the light distribution unit (8) overlaps with the photoelectric conversion unit (7). The light (L3) for power supply is incident on the photoelectric conversion unit (7) through the light distribution unit (8).

[0104] The optical system (100) according to the seventh aspect can make the emission direction of the power supply light (L3) the same as the emission direction of the illumination light (L1). Furthermore, the optical system (100) according to the seventh aspect can reduce the area occupied by the components including the light distribution unit (8) and the photoelectric conversion unit (7) when viewed from the target space (S1), thereby improving the design.

[0105] An optical system (100) according to an eighth aspect is in any one of the second to seventh aspects, and further includes a control unit (9) that controls the light source unit (1). The control unit (9) has a function of controlling the light source unit (1) so that the light source unit (1) emits only the light for power supply (L3) out of the light for power supply (L3) and the light for illumination (L1), and a function of controlling the light source unit (1) so that the light source unit (1) emits only the light for illumination (L1) out of the light for power supply (L3) and the light for illumination (L1).

[0106] The optical system (100) according to the eighth aspect is capable of switching between control of emitting only power supply light (L3) from the light source unit (1) and control of emitting only illumination light (L1) from the light source unit (1), and it is possible to perform control of emitting only power supply light (L3) from the light source unit (1) and control of emitting only illumination light (L1) from the light source unit (1) at different time periods.

[0107] An optical system (100) according to a ninth aspect is any one of the second to eighth aspects, wherein the power supply light (L3) and the illumination light (L1) differ from each other in at least one of spectrum, emission direction, and luminous intensity distribution angle.

[0108] The optical system (100) according to the ninth aspect can emit the light (L3) for power supply and the light (L1) for illumination from the light source unit (1) as light suited to each of them.

[0109] In the optical system (100) according to the tenth aspect, in any one of the first to seventh aspects, the light for power supply (L3) and the light for illumination (L1) are the same light.

[0110] The optical system (100) according to the tenth aspect makes it possible to reduce the number of components of the light source unit (1) compared to when the light for power supply (L3) and the light for illumination (L1) are different lights.

[0111] In the optical system (100) according to the eleventh aspect, in the first aspect, the light source unit (1d) has a function of emitting power supply light (L3) into the target space (S1) and a function of emitting illumination light (L1) into the target space (S1) as illumination light (L2).

[0112] The optical system (100) according to the eleventh aspect is capable of directly illuminating the target space (S1) with the light source unit (1d).

[0113] The optical system (100) according to a twelfth aspect is in any one of the first to eleventh aspects, and further includes a sensor (20) that receives power supply from the photoelectric conversion unit (7).

[0114] The optical system (100) according to the twelfth aspect can utilize the photovoltaic power generated in the photoelectric conversion section (7) as a power source for the sensor (20). [Explanation of symbols]

[0115] 1, 1a, 1b, 1c, 1d Light source unit 2 Laser light source 3 Wavelength conversion section 4 lenses 5. Mirror 7 Photoelectric conversion section 8 Light distribution section 9 Control Unit 10 Holder 11 Ceiling materials 10a Holder 20 sensors 100 Optical Systems 101 Mobile L1 Light for illumination L2 illumination light L3 Power supply light S1 Target space

Claims

1. a light source unit including a laser light source; a photoelectric conversion unit capable of generating photovoltaic power, the photoelectric conversion unit generates photovoltaic power when receiving light for power supply emitted from the light source unit, the light source unit is capable of emitting light for power supply to be incident on the photoelectric conversion unit and light for illuminating a target space, a light distribution unit that reflects at least a portion of the illumination light to convert the at least a portion of the illumination light into illumination light having a light distribution characteristic different from the light distribution characteristic of the illumination light, and distributes the converted illumination light into the target space; Further provided is a holder that holds the photoelectric conversion unit and the light distribution unit. Optical system.

2. The photoelectric conversion unit and the light distribution unit are adjacent to each other.

10. The optical system of claim 1.

3. The holder includes a ceiling material facing the target space, 3. An optical system according to claim 1 or 2.

4. The holding body is a moving body.

3. An optical system according to claim 1 or 2.

5. A light source unit including a laser light source; a photoelectric conversion unit capable of generating photovoltaic power, the photoelectric conversion unit generates photovoltaic power when receiving light for power supply emitted from the light source unit, the light source unit is capable of emitting light for power supply to be incident on the photoelectric conversion unit and light for illuminating a target space, a light distribution unit that converts at least a portion of the illumination light into illumination light having a light distribution characteristic different from the light distribution characteristic of the illumination light by reflecting at least a portion of the illumination light, and distributes the converted illumination light into the target space; the light distribution unit overlaps the photoelectric conversion unit, The light for power supply is incident on the photoelectric conversion unit through the light distribution unit. Optical system.

6. Further comprising a control unit for controlling the light source unit, The control unit a function of controlling the light source unit so as to emit only the light for power supply out of the light for power supply and the light for illumination from the light source unit; a function of controlling the light source unit so as to emit only the light for illumination out of the light for power supply and the light for illumination from the light source unit; 6. An optical system according to claim 1, 2 or 5.

7. The light for power supply and the light for illumination differ from each other in at least one of spectrum, emission direction, and light distribution angle.

6. An optical system according to claim 1, 2 or 5.

8. The light for power supply and the light for illumination are the same light.

6. An optical system according to claim 1, 2 or 5.

9. Further comprising a sensor that receives power from the photoelectric conversion unit.

6. An optical system according to claim 1, 2 or 5.

Images