Lighting device and lighting method

Abstract

To provide a lighting device and a lighting method capable of converting light received from a light source into electrical energy and reusing the energy, without reducing a light emission from the light source.SOLUTION: A light source light generation unit 140 receives light source light radiated from a light source unit 110 on a back side surface of a frame material 130, which is the side on which the light source light radiated from the light source unit 110 is made incident, in a blocking unit that blocks the light source light radiated from the light source unit 110, and the light source light generation unit 140 thus generates power.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a lighting device and a lighting method, and particularly to a lighting device provided with a light source and a lighting method.

Background Art

[0002] Conventionally, there has been known a lighting fixture that uses illumination light as a light source, performs photovoltaic power generation with an attached solar cell panel, and reuses the obtained electric power as a power source for an electrical product. (For example, see Patent Document 1).

[0003] FIG. 4 is a perspective view showing the lighting fixture disclosed in Patent Document 1. As shown in FIG. 4, the lighting fixture 10 disclosed in Patent Document 1 includes a light emitter 11, a shade 12, a light emitter holder 13, a solar cell panel 14, a solar cell panel holder 15, and a support frame 16.

[0004] The light emitter 11 is an annular light emitter such as a round fluorescent lamp, and a box-shaped shade 12 is provided around it. The light emitter 11 is fixed to the shade 12 via the light emitter holder 13.

[0005] Inside the light emitter 11, a cylindrical solar cell panel holder 15 is attached to the light emitter holder 13 via the support frame 16, and a semi-cylindrical solar cell panel 14 is fixed by the solar cell panel holder 15 in a state of standing inside the light emitter 11 and in a direction opposite to the shade 12, that is, in the irradiation direction of the light by the light emitter 11.

[0006] The solar cell panel 14 is connected here to a rechargeable battery or a power supply unit for the light emitter 11 via lead terminals (not shown here), and the electric power generated by the solar cell panel 14 is supplied to the rechargeable battery or the power supply unit for the light emitter 11.

[0007] As a result, the light emitted by the light emitter 11 is received by the solar cell panel 14 inside the light emitter 11 and in the direction opposite to the hat portion 12, and the solar cell panel 14 generates electricity by receiving the light. The generated electric power is supplied to the light emitter 11 again. Electric power is supplied to a load such as an electronic device through a rechargeable battery unit connected to the battery panel.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0009] However, in the lighting fixture 10 disclosed in Patent Document 1, the solar cell panel 14 is close to the light emitter 11 in the downward inner direction of the light emitter 11, and furthermore, the solar cell panel 14 is provided so as to block the light from the light emitter 11 in the irradiation direction of the light from the light emitter 11. Therefore, the light emitted by the light emitter 11 is blocked by the solar cell panel 14, and there is a problem that the amount of light as the lighting fixture 10 decreases.

[0010] The present invention has been made in view of such points, and an object thereof is to provide a lighting device and a lighting method capable of converting the light received from a light source into electric energy and reusing it without reducing the amount of light emitted by the light source.

Means for Solving the Problems

[0011] In the present invention, in order to solve the above problems, in a lighting device including a light source, a light source light power generation unit that receives and generates power from the light source light on the side where the light source light is incident in a blocking unit that blocks the light source light emitted from the light source is provided. A lighting device is provided. As a result, in the blocking unit that blocks the light source light emitted from the light source, the light source light power generation unit generates power by receiving the light source light on the side where the light source light is incident.

[0012] Further, in the present invention, in an illumination method including a light source, a step is provided in which a light source light power generation unit generates power by receiving the light source light on the side where the light source light is incident in a blocking unit that blocks the light source light irradiated from the light source. An illumination method characterized by this is provided. Thereby, in the blocking unit that blocks the light source light irradiated from the light source, the light source light power generation unit generates power by receiving the light source light on the side where the light source light is incident.

Effect of the Invention

[0013] According to the illumination device and the illumination method of the present invention, since the light source light power generation unit generates power by receiving the light source light on the side where the light source light is incident in the blocking unit that blocks the light source light irradiated from the light source, it is possible to convert the light received from the light source into electric energy and reuse it without reducing the amount of light emitted by the light source.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0015] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 〔First Embodiment〕 FIG. 1 is a front view showing an illumination device according to a first embodiment and a cross-sectional view taken along line X-X.

[0016] As shown in FIG. 1, the lighting device 100 includes a light source unit 110, a light guide plate 120, a frame member 130, a light source photovoltaic power generation unit 140, an external photovoltaic power generation unit 150, and a diffusion unit 160. The light source unit 110 is connected to a power source (not shown here), or to the light source photovoltaic power generation unit 140 and the external photovoltaic power generation unit 150 described later, or is a light-emitting body that emits light by the electric power supplied from the light source photovoltaic power generation unit 140 and the external photovoltaic power generation unit 150 described later. The light source unit 110 may employ, for example, a light-emitting diode with low power consumption.

[0017] The light source unit 110 has light-emitting bodies arranged along the end face of the light guide plate 120 in order to make light enter from at least one end face of the light guide plate 120 described later. When the light source unit 110 emits light, the light that enters is diffused by the light guide plate 120, causing the light guide plate 120 to emit light.

[0018] The light guide plate 120 is a plate processed to diffuse the light received by the light source unit 110 so that the front panel emits light uniformly, and includes a light guide material 121, a reflective material 122, a diffusing material 123, and a notch portion 124.

[0019] The light guide material 121 is a plate material made of, for example, an acrylic resin with excellent transparency and light resistance. For example, by performing a plurality of groove processes on one side surface, the light that travels straight after receiving light from the end face is refracted to the other side surface.

[0020] A reflective material 122 is provided on one side surface of the light guide material 121 and on the other end faces except for the end face where light from the light source unit 110 enters, for reflecting the light that travels straight on one side surface of the light received by the light guide material 121 to the other side surface. Due to the groove processing by the light guide material 121 and the reflection of light by the reflective material 122, the light received by the light guide material 121 is guided to the other side.

[0021] The diffusing material 123 is provided on the other side surface of the light guide material 121 and is for diffusing the received light. As a result, the light guided to the other side of the light guide material 121 is diffused to the other side by the diffusing material 123.

[0022] The cutout portion 124 is a portion obtained by cutting out a part of the diffusion material 123 that contacts a diffusion portion 160 to be described later. Specifically, only the diffusion material 123 of the light guide plate 120 along the shape in which the diffusion portion 160 is accommodated is cut out. Thereby, the light guide material 121 is exposed at the portion that contacts the diffusion portion 160, and the light reflected inside the light guide material 121 can be incident on the diffusion portion 160 perpendicularly without being diffused.

[0023] In this way, by including the light guide material 121, the reflection material 122, and the diffusion material 123, the light guide plate 120 receives the light from the light source portion 110 incident from at least one end face, and the received light is diffused to the other side.

[0024] Also, by providing the cutout portion 124 in the diffusion material 123, light that is not diffused to the diffusion portion 160 can be directly incident, so that the diffusion portion 160 can receive and diffuse stronger light.

[0025] The frame member 130 is provided so as to cover the periphery of the light guide plate 120. The frame member 130 has a U-shape, and the periphery of the light guide plate 120 and a light source photovoltaic portion 140 and a diffusion portion 160 to be described later are accommodated inside the U-shape.

[0026] Although there is no particular specification regarding the material of the frame member 130, various materials such as wood with light-shielding properties, metal, resin, pottery, and clay, which have excellent transparency and light resistance with respect to the light guide plate 120, can be cited as examples.

[0027] Thereby, at the periphery of the light guide plate 120 that emits light, the light from the light guide plate 120 that emits light is blocked by the frame member 130, serving as a light-blocking cross section, and a shadow is formed on the other side of the frame member 130. Therefore, the boundary between the frame member 130 and its surroundings can be made clear, and the light emission by the light source portion 110 and the light guide plate 120 can be made clearer.

[0028] The light source photovoltaic unit 140 is for receiving and generating electricity from the light emitted by the light guide plate 120 housed in the frame member 130. It is housed in the frame member 130 together with the light guide plate 120, on the other side of the light guide plate 120 housed in the frame member 130, and is provided on the inner surface of the frame member 130.

[0029] Thereby, among the light emitted by the light guide plate 120, the light source photovoltaic unit 140 receives the light that was blocked by the frame member 130 and wasted, and by converting the received light into electrical energy, the wasted light can be recovered and reused.

[0030] Specifically, the light source photovoltaic unit 140 is composed of a support member 141 bent in a curved shape with a width that can be housed inside the frame member 130, and a perovskite solar cell 142 provided inside along the support member 141.

[0031] The perovskite solar cell 142 is a solar cell using perovskite crystals. Since perovskite crystals have a high utilization rate of visible light, they have a large light absorption coefficient and can be formed into a thin film while maintaining a high energy conversion efficiency. Therefore, for example, the bent perovskite solar cell 142 can be arranged along the inside of the support member 141 formed by bending an aluminum material.

[0032] In this way, the light source photovoltaic unit 140 can reduce the number of wirings connecting to each other compared to the case of connecting a plurality of perovskite solar cells 142 by bending a single perovskite solar cell 142 and housing it inside the frame member 130. Also, by receiving light on a curved surface, the light reception loss occurring at the corners can be reduced.

[0033] The light source photovoltaic unit 140 is connected here to a power source such as the light source unit 110 or a battery that supplies power to the light source unit 110 by wiring not shown here, and the electrical energy converted by the light source photovoltaic unit 140 is supplied to the light source unit 110 or the power source. Thereby, the light that was wasted inside the frame member 130 can be recovered and reused.

[0034] The diffusion part 160 is for diffusing the light received from the light guide plate 120 to the light source photoelectric conversion part 140 arranged so as to cover the diffusion part 160. The diffusion part 160 is a prism body obtained by processing a transparent body such as glass into a triangular prism shape, and a plurality of them are arranged so that one of the side surfaces of the diffusion part 160 is in contact with the light guide plate 120 and along the frame material 130.

[0035] Since the notch 124 is formed at the portion where the diffusion part 160 and the light guide plate 120 are in contact as described above, the diffusion part 160 can receive the light emitted from the light guide plate 120 without passing through the diffusion material 123. The light received by the diffusion part 160 is diffused inside the area covered by the light source photoelectric conversion part 140.

[0036] The external light power generation part 150 is for receiving and generating electricity from the light received from the outside of the periphery of the lighting device 100, and is provided on the outer surface of the frame material 130. The light received from the outside of the periphery of the lighting device 100 here specifically refers to natural light such as sunlight, or light emitted by other lighting fixtures that emit light indoors.

[0037] The external light power generation part 150 is composed of a perovskite solar cell 142 in the same manner as the light source photoelectric conversion part 140, and is provided around the front outer side of the frame material 130 and the side outer side of the frame material 130, but it can also be provided on the back outer side of the frame material 130.

[0038] The external light power generation part 150 is connected to the light source part 110 or a power source such as a battery that supplies power to the light source part 110 by wiring (not shown here), and the electrical energy converted by the external light power generation part 150 is supplied to the light source part 110 or the power source. Thereby, the light source part 110 can receive light such as ambient natural light and emit light by the converted electrical energy. For this reason, it does not require an external power source or electricity.

[0039] FIG. 2 is a cross-sectional view showing another arrangement example of the light source photoelectric conversion unit in the lighting device according to the first embodiment. Therefore, for the components that are substantially the same as those in FIG. 1 above, the same reference numerals are assigned and the description thereof is omitted as appropriate.

[0040] As shown in FIG. 2(A), the frame member 130 is provided so as to cover the periphery of the light guide plate 120, and is formed so as to close the U-shaped opening shown in FIG. 1. The light source photoelectric conversion unit 140 is disposed on the inner surface of the frame member 130 formed so as to close the opening, and the diffusion unit 160 is disposed between the light source photoelectric conversion unit 140 and the light guide plate 120.

[0041] Thereby, the light emitted by the light guide plate 120 is blocked by the frame member 130 with the opening closed. However, since the light source photoelectric conversion unit 140 is disposed along the inner surface of the frame member 130, the light source photoelectric conversion unit 140 can receive the light blocked by the frame member 130, and the received light can be converted into electrical energy by the light source photoelectric conversion unit 140, so that the wasted light can be recovered and reused.

[0042] As shown in FIG. 2(B), the frame member 130 is provided so as to cover the periphery of the light guide plate 120, and is formed so as to sandwich only the light source photoelectric conversion unit 140 disposed on the light guide plate 120 and the other periphery of the light guide plate 120.

[0043] Therefore, as shown in FIG. 1 and FIG. 2(A), the diffusion unit 160 is not disposed. A notch portion 124 is formed in the light guide plate 120 by cutting out the diffusion material 123 at the portion where the light source photoelectric conversion unit 140 and the light guide plate 120 are in contact. Thereby, the light emitted by the light guide plate 120 can be received by the light source photoelectric conversion unit 140 without being diffused elsewhere.

[0044] As a result, the light emitted by the light guide plate 120 is blocked by the frame member 130. However, since the light source light power generation unit 140 is disposed along the inner surface of the frame member 130, the light source light power generation unit 140 receives the light blocked by the frame member 130, and the received light can be converted into electrical energy by the light source light power generation unit 140, so that the wasted light can be recovered and reused.

[0045] 〔Second Embodiment〕 Next, a second embodiment of the present invention will be described. The lighting device of the present embodiment is substantially the same as the configuration shown in the first embodiment except that the structure of the light blocking surface for blocking the light from the light source is different. Therefore, for the components that are substantially the same as those in the first embodiment, the same reference numerals are given and the description thereof is omitted as appropriate.

[0046] FIG. 3 is a front view, a cross-sectional view taken along the line Y - Y, and a cross-sectional view taken along the line Z - Z showing the lighting device according to the second embodiment. As shown in FIG. 3, the lighting device 100 includes a light source unit 110, a light source light power generation unit 140, and a cap portion 170.

[0047] The cap portion 170 is provided so as to cover the light source unit 110, and includes a cap main body portion 171, a light shielding portion 172, and a decorative body light emitting portion 173. The cap main body portion 171 is made of an acrylic resin or the like having excellent transparency and light resistance, which is formed of a material that transmits the light source light from the light source unit 110, and is formed into a box-shaped body that covers the light source unit 110.

[0048] The light shielding portion 172 is provided in a part of the cap portion 170 for blocking or reducing the light source light from the light source unit 110, and a light shielding sheet is attached or a paint is applied thereto. As a result, a part of the cap portion 170 blocks or reduces the light source light from the light source unit 110 and a shadow is formed. In FIG. 3, an example in which the light shielding portion 172 is provided in a part of the front side of the cap portion 170 is described, but the light shielding portion 172 can also be provided inside the cap portion 170.

[0049] By providing a light-shielding portion 172 decorated on a part of the basket portion 170, the portion other than the portion where the light-shielding portion 172 is provided transmits the light source light from the light source portion 110 and emits light. Thereby, the decorative body light-emitting portion 173 is projected.

[0050] The light source light power generation portion 140 is provided on the side where the light source light from the light source portion 110 is incident among the light-shielding portions 172 provided on the basket portion 170. Specifically, a light source light power generation portion 140 having the same shape as the light-shielding portion 172 is provided on the side where the light source portion 110 is arranged inside the basket portion 170 at the same position as the light-shielding portion 172.

[0051] Thereby, on the light source portion 110 side of the light-shielding portion 172 that blocks or reduces the light source light from the light source portion 110, the light source light power generation portion 140 receives the light emitted by the light source portion 110, and the received light can be converted into electrical energy by the light source light power generation portion 140. Therefore, the light that was wasted in the light-shielding portion 172 can be recovered and reused.

Explanation of Reference Numerals

[0052] 100 Lighting device 110 Light source portion 120 Light guide plate 121 Light guide material 122 Reflective material 123 Diffusion material 124 Notch portion 130 Frame material 140 Light source light power generation portion 141 Support material 142 Perovskite solar cell 150 External light power generation portion 160 Diffusion portion

Claims

1. In an illumination device including a light source, a light source light power generation unit that receives and generates electric power from the light source light on the side where the light source light is incident in a blocking unit that blocks the light source light irradiated from the light source, The illumination device is characterized by comprising:

2. a light guide plate that guides the light source light incident from at least one end face to one side surface in a plate shape and causes the light to emit light; a frame member provided so as to cover the periphery of the light guide plate; The illumination device is characterized by comprising: The light source light power generation unit is provided on the inner peripheral surface of the frame member facing one side surface of the light guide plate. The illumination device according to claim 1, characterized in that:

3. A diffusion unit for diffusing the light emitted from one side surface of the light guide plate is provided between one side surface of the light guide plate and the inner side surface of the frame member. The illumination device according to claim 2, characterized in that:

4. The light source light power generation unit is provided in a curved surface shape so as to cover the diffusion unit. The illumination device according to claim 3, characterized in that:

5. The light guide plate is provided with a diffusion material for diffusing light on one side surface that emits light, and a notch portion obtained by notching a portion where the diffusion unit and the light guide plate are in contact among the diffusion materials. The illumination device according to claim 3, characterized in that:

6. The diffusion unit is a prism. The illumination device according to claim 3, characterized in that:

7. a cap portion provided so as to cover the light source light; a decoration portion in which a decoration body is projected by a light shielding portion provided on the cap portion for blocking or reducing the light source light; The illumination device is characterized by comprising: The light source light power generation unit is provided on the light emitting side surface of the light source light in the light shielding portion. The illumination device according to claim 1, characterized in that:

8. The light source light power generation unit is composed of a perovskite solar cell. The illumination device according to claim 1, characterized in that:

9. On at least a part of the outer peripheral surface of the frame member, an external light power generation unit that receives external light from the surroundings and generates electric power is provided. The illumination device according to claim 2, characterized in that:

10. In an illumination method including a light source, a step of generating electric power by a light source light power generation unit that receives the light source light on the side where the light source light is incident in a blocking unit that blocks the light source light irradiated from the light source. The illumination method is characterized by comprising:

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