WO2022024825A1 - Dispositif d'éclairage de fenêtre - Google Patents

Dispositif d'éclairage de fenêtre Download PDF

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Publication number
WO2022024825A1
WO2022024825A1 PCT/JP2021/026881 JP2021026881W WO2022024825A1 WO 2022024825 A1 WO2022024825 A1 WO 2022024825A1 JP 2021026881 W JP2021026881 W JP 2021026881W WO 2022024825 A1 WO2022024825 A1 WO 2022024825A1
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WO
WIPO (PCT)
Prior art keywords
light
guide plate
light guide
main surface
functional layer
Prior art date
Application number
PCT/JP2021/026881
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English (en)
Japanese (ja)
Inventor
宇峰 翁
恒三 中村
貴博 吉川
Original Assignee
日東電工株式会社
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Filing date
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Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Publication of WO2022024825A1 publication Critical patent/WO2022024825A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S11/00—Non-electric lighting devices or systems using daylight
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S19/00—Lighting devices or systems employing combinations of electric and non-electric light sources; Replacing or exchanging electric light sources with non-electric light sources or vice versa
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S9/00—Lighting devices with a built-in power supply; Systems employing lighting devices with a built-in power supply
    • F21S9/02—Lighting devices with a built-in power supply; Systems employing lighting devices with a built-in power supply the power supply being a battery or accumulator
    • F21S9/03—Lighting devices with a built-in power supply; Systems employing lighting devices with a built-in power supply the power supply being a battery or accumulator rechargeable by exposure to light
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to a window lighting device.
  • a self-illuminating design panel in which a design panel portion and a solar cell panel portion are overlapped with each other is disclosed (see, for example, Patent Document 2).
  • a solar cell composite display body including an optical sheet having a display surface, a solar cell panel, and a lighting device is disclosed (see, for example, Patent Document 3).
  • Patent Document 1 does not disclose the power saving function. Further, Patent Documents 2 and 3 do not disclose or suggest the use of the solar cell panel for window lighting. Therefore, in the configurations of Patent Documents 1 to 3, it is not possible to save power by using sunlight.
  • An object of the present invention is to provide a window lighting device capable of saving electricity by using sunlight.
  • the window lighting device of the present invention has a light source, a light guide unit, and a power source for supplying power to the light source, and the light guide unit is emitted from the light source.
  • It has a light guide plate that guides light and a photopower generation unit that receives sunlight to generate light.
  • the light guide plate faces the light source, and the light incident end face on which the light emitted from the light source is incident.
  • a light emitting portion that is included in a predetermined main surface of the light guide plate that intersects the light incident end surface and emits light guided through the light guide plate, and the photopower generation unit has the guiding portion. It is provided on the opposite main surface side of the optical plate facing the predetermined main surface, and supplies generated power to the power source.
  • FIG. 3 is a sectional view taken along the line AA of FIG. 1A showing an overall configuration example of the window lighting device according to the first embodiment. It is a figure which shows the 1st example of the structure of the light extraction part. It is a figure which shows the 2nd example of the structure of the light extraction part. It is a figure which shows the 3rd example of the structure of the light extraction part. It is a figure which shows the 4th example of the structure of the light extraction part. It is a figure which shows the 5th example of the structure of the light extraction part. It is a figure which shows the sixth example of the structure of the light extraction part.
  • the window lighting device has a light source, a light guide unit, and a power source for supplying driving power to the light source
  • the light guide unit includes a light guide plate for guiding light emitted from the light source and the sun. It has an optical power generation unit that receives light and generates light. The light emitted from the light source enters the light guide plate from the light incident end face facing the light source, is guided in the light guide plate, and then emits light included in a predetermined main surface of the light guide plate intersecting the light incident end face. It emits from the part.
  • the photovoltaic power generation unit is provided on at least a part of the light guide plate on the opposite main surface side facing the predetermined main surface, and supplies the generated power generated by receiving sunlight to the power source. This makes it possible to save electricity by using sunlight.
  • the light guide plate means a plate-shaped member including a flat portion or a curved portion.
  • the main surface means a flat surface or a curved surface that intersects in the thickness direction in the plate-shaped member.
  • One main surface may be formed by combining a plurality of planes or curved surfaces.
  • the end face is the side surface of the end of the plate-shaped member, and means a surface that intersects with the main surface.
  • the width direction when the window lighting device 100 is viewed from the front side is the X-axis direction
  • the depth direction is the Y-axis direction
  • the height direction is the Z-axis direction.
  • FIGS. 1A and 1B are views for explaining an example of the overall configuration of the window lighting device 100 according to the first embodiment, FIG. 1A is a front view, and FIG. 1B is a sectional view taken along the line AA of FIG. 1A.
  • the window lighting device 100 includes a frame 10, a light source 1, a light guide unit 300, a drive circuit 3, a switch 4, and a battery 5.
  • the light guide unit 300 has a light guide plate 2 and a solar cell panel 6.
  • the window lighting device 100 is a flat plate-shaped and rectangular device that can be attached to a window 200 of a building, and is a window-combined lighting device that functions as a lighting device during nighttime lighting and as a transparent window during non-lighting such as daytime. Is.
  • the window lighting device 100 causes the light emitted by the light source 1 to enter the light guide plate 2 which is a plate-shaped member, guides the inside of the light guide plate 2, and then guides the inside of the light guide plate 2 to the inside of the building.
  • a small amount of leaked light that does not have a lighting function and leaks from the outer surface of the building of the light guide plate 2 is absorbed by the solar cell panel 6 and stored as electric power.
  • the solar cell panel 6 provided on the outside of the building of the light guide plate 2 receives sunlight and generates electricity. The generated electric power is charged in the battery 5 and used as driving electric power of the light source 1 at the time of lighting.
  • the negative side of the Y-axis corresponds to the outside side of the building
  • the positive side of the Y-axis corresponds to the inside side of the building.
  • the frame 10 is a frame-shaped member provided with a constant width and a constant thickness along the outer peripheral edge portion of the light guide plate 2 (that is, the four sides of the light guide plate 2).
  • the external dimensions of the frame 10 are substantially the same as the internal dimensions of the sash 210 as the window frame provided in the window 200.
  • the window lighting device 100 can be easily attached to the window 200 in a state of being overlapped with the window glass 220 included in the window 200 by being fitted inside the sash 210.
  • the light source 1 is arranged to face the end face on the negative side of the Z axis of the light guide plate 2 and is fixed to the inside of one side of the frame 10.
  • the light source 1 is configured by arranging a plurality of LEDs (Light Emitting Diodes) in a line in the X-axis direction. By applying a drive voltage from the drive circuit 3, each LED emits light.
  • the light source 1 can emit line-shaped light formed by the light emitted from each LED extending in the X-axis direction in the positive direction of the Z-axis.
  • the light emitted by the light source 1 is not particularly limited, and various types such as white light, monochromatic light, light bulb color, neutral white, and daylight color can be appropriately selected according to the intended use.
  • the type of light source is not limited to LEDs, and linear light sources such as fluorescent lamps and cold-cathode tubes, and those in which a plurality of optical fibers are bundled in a line can be used.
  • the drive circuit 3 is an electric circuit that applies a direct current or alternating current drive voltage to the light source 1.
  • the drive circuit 3 may be provided inside the frame 10 together with the light source 1, or may be installed separately from the frame 10.
  • the switch 4 is a switch for switching between a lighting state in which the battery 5 is connected to the drive circuit 3 and a charging state in which the battery 5 is connected to the solar cell panel 6.
  • the illuminated state the stored power of the battery 5 is supplied to the drive circuit 3 to drive the light source 1.
  • the charged state the generated power of the solar cell panel 6 is supplied to the battery 5 to charge the battery 5.
  • the switch 4 can be operated by the user of the window lighting device 100 to switch between a lighting state and a charging state.
  • any kind of switch such as a push switch, a toggle switch, a slide switch and the like can be used.
  • the switch 4 may be integrally provided with the window lighting device 100, or may be attached to the window 200, the wall surface on which the window 200 is provided, or the like.
  • the lighting state and the charging state may be automatically switched according to the detected value of the output voltage of the solar cell panel 6.
  • the switching state is not limited to the lighting state and the charging state, and other states such as an off state in which neither lighting nor charging is performed may be added.
  • the battery 5 is an example of a power source that supplies the driving power of the light source 1.
  • the battery 5 can supply DC or AC voltage to the drive circuit 3 in the illuminated state, and can charge the power generated by the solar cell panel 6 in the charged state.
  • various secondary batteries for example, a lithium ion battery, a lithium polymer battery, etc.
  • the battery 5 may be provided inside the frame 10 or may be provided separately from the frame 10. Further, the drive circuit 3, the switch 4, the battery 5, and the like may be integrated.
  • the light guide plate 2 is a transparent flat plate-like member having transparency to visible light.
  • the light guide plate 2 has a rectangular shape in a plan view.
  • the visible light transmittance of the light guide plate 2 is 60% or more, 65% or more, 70% or more, 75% or more, 80% or more, 85% or more, or 90% or more.
  • the visible light transmittance is specified as an average value of the transmittance at each wavelength when measured at a measurement wavelength of 380 nm or more and 780 nm or less using a spectrophotometer.
  • Such a light guide plate 2 can be manufactured by molding a resin material.
  • the resin material include PMMA (Polymethylmethacrylate).
  • PMMA Polymethylmethacrylate
  • the light guide plate 2 can be configured by including a glass material. Colored materials may be used as long as they are transparent to visible light.
  • the processing method is not limited to resin molding, and bending processing, cutting processing, or the like can also be applied.
  • the light guide plate 2 has a light incident end surface 21, an end surface 22, a first main surface 23, and a second main surface 24.
  • the light incident end surface 21 is one end surface of the light guide plate 2 in which the light emitted from the light source 1 facing the light source 1 is incident on the light guide plate 2.
  • the end face 22 is the other end surface facing the light incident end face 21.
  • the end surface 22 faces or is close to the inner surface (the surface on the negative side of the Z axis) of the frame 10.
  • the first main surface 23 points to the positive side of the Y-axis of the flat surface portion of the light guide plate 2, and is an example of a predetermined main surface of the light guide plate that intersects the light incident end surface. Further, the first main surface 23 includes a light emitting portion 231 from which the light guided in the light guide plate 2 is emitted. In FIG. 1B, the thick line portion on the first main surface 23 corresponds to the light emitting unit 231 and the region in which the light is emitted in the first main surface 23 corresponds to the light emitting unit 231.
  • the second main surface 24 points to the negative side of the Y-axis of the flat surface portion of the light guide plate 2, and is an example of a facing main surface facing a predetermined main surface of the light guide plate 2. Further, at least a part of the second main surface 24 is provided with a light extraction unit 241 that emits the light guided in the light guide plate 2 from the light emission unit 231.
  • each of the light incident end surface 21, the light emitting portion 231 and the light extracting portion 241 is a portion extending over the entire light guide plate 2 in the X-axis direction, but is not limited thereto, and X It may be a part of the light guide plate 2 in the axial direction.
  • the light emitted from the light source 1 in the positive direction of the Z axis enters the light guide plate 2 through the light incident end surface 21 and is totally reflected by the first main surface 23 and the second main surface 24.
  • the inside of the light guide plate 2 is guided in the positive direction of the Z axis while repeating the above steps.
  • a part of the light guided in the light guide plate 2 is reflected, scattered or diffracted by the light extraction unit 241 and guided to the light emission unit 231 and emitted from the light guide plate 2 through the light emission unit 231. ..
  • the light 232 (arrow-dashed line arrow) emitted from the light emitting unit 231 illuminates the inside of the window 200 (inside the building) to which the window lighting device 100 is attached.
  • the light emitting unit 231 corresponds to a region through which the light emitted from the light guide plate 2 passes within the region of the first main surface 23, and the region of the light extraction unit 241 and the region of the light emitting unit 231 are substantially equal.
  • the light extraction unit 241 is provided in a size slightly smaller than that of the second main surface 24, not the entire surface of the second main surface 24, but is limited to this. It's not a thing.
  • a light extraction unit 241 can be provided on at least a part of the second main surface 24. Further, in the examples of FIGS. 1A and 1B, the light extraction unit 241 is provided on the second main surface 24, but the light extraction unit 241 can also be provided on the first main surface 23. The details of the light extraction unit 241 will be described later with reference to FIGS. 2A to 8B.
  • the light emitted from the light emitting unit 231 is light reflected, scattered or diffracted in a wide area in the light guide plate 2.
  • the light emitted from the light emitting unit 231 can illuminate a wide range longer than the length of the light guide plate 2 in the X-axis direction.
  • a part of the light incident from the light incident end surface 21 and being guided in the Z-axis positive direction in the light guide plate 2 while being totally reflected by the first main surface 23 and the second main surface 24 is the end surface 22. Is reached and emitted from the end face 22. The light emitted from the end surface 22 is reflected or diffused to the negative side of the Z-axis on the inner surface of the frame 10 and again enters the light guide plate 2, and is guided in the negative direction of the Z-axis while being totally reflected inside the light guide plate 2. Will be done.
  • a solar cell panel 6 is provided on the second main surface 24 side of the light guide plate 2. More specifically, the solar cell panel 6 is provided on the negative side of the Y-axis of the light extraction unit 241 provided on the second main surface 24 of the light guide plate 2.
  • This solar cell panel 6 is an example of a photovoltaic power generation unit that receives sunlight to generate electricity.
  • the solar cell panel 6 can be fixedly provided to the light guide plate 2, but the fixing method is not particularly limited, and adhesion, screwing, fitting, or the like can be appropriately selected. Further, in the examples of FIGS. 1A and 1B, the solar cell panel 6 is provided with substantially the same size as the light extraction unit 241 in a plan view, but the solar cell panel 6 is not limited to this.
  • the solar cell panel 6 can be provided on at least a part of the second main surface 24.
  • a solar cell is an electric power device that generates electricity by converting the energy of the received light into electric power (electrical energy).
  • the solar cell panel is a panel-shaped solar cell in which a plurality of small-sized solar cells are aggregated and housed in a frame or a structure. By forming a panel of solar cells and connecting them in series, the voltage obtained from the electromotive force of a small solar cell can be aggregated and increased one by one.
  • the solar cell panel 6 receives sunlight to generate electricity, and can supply the generated power to the battery 5. In this way, the light energy of sunlight is converted into electric power and used as the driving electric power of the light source 1 to save electric power.
  • the solar cell of the solar cell panel 6 may be silicon-based, compound-based, or organic-based. Further, a perovskite type, a quantum dot type, or the like may be applied.
  • a glass substrate, a ceramic substrate, a semiconductor substrate such as silicon, or a flexible substrate composed of a resin such as polyethylene terephthalate (PET) can be used.
  • the solar cell panel 6 is composed of a transparent solar cell panel so that sunlight can be taken into the inside of the building.
  • the visible light transmittance of the solar cell panel 6 is, for example, 60% or more, 65% or more, 70% or more, 75% or more, 80% or more, 85% or more, or 90% or more.
  • the visible light transmittance is specified as an average value of the transmittance at each wavelength when measured at a measurement wavelength of 380 nm or more and 780 nm or less using a spectrophotometer.
  • the visible light transmittance of the light guide unit 300 including the solar cell panel 6, the light extraction unit 241 and the light guide plate 2 is, for example, 60% or more, 65% or more, 70% or more, 75% or more, 80% or more, 85% or more. Or 90% or more.
  • the visible light transmittance is specified as an average value of the transmittance at each wavelength when measured at a measurement wavelength of 380 nm or more and 780 nm or less using a spectrophotometer.
  • FIGS. 2A to 8B are partially enlarged views illustrating the detailed configuration of the light extraction unit.
  • 2A shows a first example
  • FIG. 2B shows a second example
  • FIG. 3A shows a third example
  • FIG. 3B shows a fourth example.
  • 4A shows a fifth example
  • FIG. 4B shows a sixth example
  • FIG. 5A shows a seventh example
  • FIG. 5B shows an eighth example
  • FIG. 6A shows a ninth example
  • FIG. 6B shows a tenth example.
  • 7A shows the 11th example
  • FIG. 7B shows the 12th example
  • FIG. 8A shows the 13th example
  • FIG. 8B shows the 14th example.
  • the light extraction unit 241 shown in FIG. 2A has an optical functional layer 243 including an optical cavity 242 inside.
  • the optical functional layer 243 is provided on the second main surface 24.
  • the optical functional layer means a layer that exerts an optical function.
  • a solar cell panel 6 is provided on the optical functional layer 243 (on the negative side of the Y-axis).
  • the optical functional layer 243 is a thin layer made of a resin or the like, and is provided by being laminated on the surface of the light guide plate 2.
  • the second main surface 24 is attached by attaching a layered member including the optical functional layer 243 by an adhesive-free lamination method such as microwave surface treatment, or by adhering with an adhesive (including a pressure-sensitive adhesive). Can be provided in.
  • a layer having another function such as a cover layer may be included before and after the optical functional layer 243 in the stacking direction.
  • the material of the optical functional layer 243 and the material of the adhesive that adheres the optical functional layer 243 to the light guide plate 2 have a refractive index close to that of the light guide plate 2 in order to suppress refraction and reflection of light at the interface with the light guide plate 2. It is preferable that it is a thing.
  • the same material containing PMMA as the light guide plate 2 can be used.
  • the optical cavity 242 is an example of a void portion, and the inside is filled with air. However, the optical cavity 242 may be filled with a material having a refractive index lower than that of the optical functional layer instead of air.
  • a plurality of optical cavities 242 are regularly or randomly provided in the optical functional layer 243 along the plane of the first main surface 23. The size of the optical cavity 242 can be appropriately selected within a range that can be installed inside the optical functional layer 243.
  • the optical functional layer including the optical cavity is not particularly limited, and for example, International Publication No. 2011/124765, International Publication No. 2011/127187, International Publication No. 2019/087118, International Publication No. 2019/182091 The optical functional layer disclosed in the above can be used. These contents are incorporated herein by reference.
  • the first film 2431 in which the pattern is not formed and the second film 2432 in which the desired fine pattern is formed are bonded together by a lamination method, or an adhesive (pressure sensitive adhesive) is used. It is manufactured by adhering with (including).
  • Laser patterning, direct laser imaging, laser drilling, maskless or maskless laser or electron beam irradiation is used to form a fine pattern on the second film 2432.
  • the material and the refractive index value may be changed by imparting individual characteristics by printing, inkjet printing, screen printing or the like.
  • Micro / nano-dispensing, dosing, direct "writing”, discrete laser sintering, micro-electric discharge machining (micro EDM), micromachining, micromolding, imprinting, embossing and the like can also be used.
  • the light guided in the light guide plate 2 passes through the interface between the light guide plate 2 and the optical functional layer 243 or is refracted at the interface and enters the optical functional layer 243. Then, a part of the light guided in the optical functional layer 243 is reflected at the interface between the optical functional layer 243 and the optical cavity 242 and guided toward the light emitting portion 231. Of the reflected light, the light incident on the first main surface 23 at an angle exceeding the critical angle is emitted from the inside of the light guide plate 2 to the outside. The portion of the first main surface 23 from which light is emitted corresponds to the light emitting portion 231.
  • Light that is not reflected at the interface between the optical functional layer 243 and the optical cavity 242 is guided in the positive direction of the Z axis while repeating total reflection at the interface between the optical functional layer 243 and the outside air. A part of the light is reflected at the interface between the optical cavity 242 and the optical functional layer 243, and is emitted from the inside of the light guide plate 2 to the outside. The above reflection is performed in each of the plurality of optical cavities 242 provided in the optical functional layer 243.
  • the light extraction unit 241 can emit light from the entire light emission unit 231 along the plane of the first main surface 23 in the positive direction of the Y axis.
  • the light extraction unit 241a shown in FIG. 2B has an optical functional layer 245 containing light scattering particles 244 inside.
  • the optical functional layer 245 is provided on the second main surface 24.
  • the material and installation method of the optical functional layer 245 are the same as those of the optical functional layer 243 described above.
  • a solar cell panel 6 is provided on the optical functional layer 245 (on the negative side of the Y-axis).
  • the light scattering particles 244 are particles having a refractive index difference with respect to the material constituting the optical functional layer 245 and having an average particle size of about 0.3 to 5 ⁇ m, and the light guided in the light guide plate 2 is emitted. This is an example of a light scattering body that scatters light.
  • a plurality of light scattering particles 244 are contained in the material constituting the optical functional layer 245.
  • the optical functional layer containing light-scattering particles is not particularly limited, and for example, the optical functional layer disclosed in Japanese Patent Application Laid-Open No. 2013-195811 can be used. These contents are incorporated herein by reference.
  • the average particle size is the volume average particle size, and can be measured by using, for example, an ultracentrifugation type automatic particle size distribution measuring device.
  • the light guided in the light guide plate 2 passes through the interface between the light guide plate 2 and the optical functional layer 245 or is refracted at the interface and enters the optical functional layer 245. Then, a part of the light guided in the optical functional layer 245 is scattered at the interface between the optical functional layer 245 and the light scattering particles 244, and is guided toward the light emitting portion 231.
  • the light incident on the first main surface 23 at an angle not exceeding the critical angle is emitted from the inside of the light guide plate 2 to the outside.
  • the portion of the first main surface 23 from which light is emitted corresponds to the light emitting portion 231.
  • the light that is not scattered at the interface between the optical functional layer 245 and the light scattering particles 244 is guided in the positive direction of the Z axis while repeating total reflection at the interface between the optical functional layer 245 and the outside air. A part of the light is scattered at the interface between the light scattering particles 244 and the optical functional layer 245, and is emitted from the inside of the light guide plate 2 to the outside. The above-mentioned scattering is performed by each of the plurality of light scattering particles 244 provided in the optical functional layer 245.
  • the light extraction unit 241a can emit light from the entire light emission unit 231 along the plane of the first main surface 23 in the positive direction of the Y axis.
  • the light extraction unit 241b shown in FIG. 3A has an optical functional layer 243 including an optical cavity 242 inside.
  • the optical functional layer 243 is provided on the first main surface 23.
  • a solar cell panel 6 is provided on the second main surface 24 (on the negative side of the Y-axis).
  • the material and function of the optical functional layer 243 are the same as those of the optical functional layer 243 in the light extraction unit 241.
  • the portion of the first main surface 23 provided with the optical functional layer 243 corresponds to the light emitting portion 231.
  • the light extraction unit 241c shown in FIG. 3B has an optical functional layer 245 containing light scattering particles 244 inside.
  • the optical functional layer 245 is provided on the first main surface 23.
  • a solar cell panel 6 is provided on the second main surface 24 (on the negative side of the Y-axis).
  • the material and function of the optical functional layer 245 are the same as those of the optical functional layer 245 in the light extraction unit 241a.
  • the portion of the first main surface 23 provided with the optical functional layer 245 corresponds to the light emitting portion 231.
  • the light extraction unit 241d shown in FIG. 4A has an optical cavity 246.
  • the optical cavity 246 is provided in the light guide plate 2c.
  • a solar cell panel 6 is provided on the second main surface 24 (on the negative side of the Y-axis).
  • the optical cavity 246 is an example of a void portion, and the inside is filled with air. However, the optical cavity 246 may be filled with a material having a refractive index lower than that of the light guide plate 2c instead of air. A plurality of optical cavities 246 are regularly or randomly provided in the light guide plate 2c along the plane of the first main surface 23. The size of the optical cavity 246 can be appropriately selected within a range that can be installed in the light guide plate 2.
  • an adhesive including a pressure-sensitive adhesive
  • the refractive indexes of the first light guide plate 201 and the second light guide plate 202 are made substantially equal, and when they are bonded with an adhesive, the refractive indexes of the adhesive are set to the first light guide plate 201 and the second light guide plate 201 and the second. It is preferable that the light guide plate 202 is substantially equal to the light guide plate 202.
  • the same method as the above-mentioned method for forming the fine pattern on the second film 2432 can be applied to the formation of the fine pattern on the second light guide plate 202. Further, the function of the optical cavity 246 is the same as that of the optical cavity 242 described with reference to FIGS. 2A and 3A.
  • the light extraction unit 241e shown in FIG. 4B has light scattering particles 247.
  • the light scattering particles 247 are provided in the light guide plate 2d. Further, a solar cell panel 6 is provided on the second main surface 24 (on the negative side of the Y-axis).
  • the light scattering particles 247 are particles having a refractive index difference with respect to the material constituting the light guide plate 2d and having an average particle size of about 0.3 to 5 ⁇ m, and scatter the light guided in the light guide plate 2. It is an example of a light scattering body that causes light scattering.
  • the light scattering particles 247 are contained in the material constituting the light guide plate 2d.
  • the function of the light-scattering particles 247 is similar to that of the light-scattering particles 244 described with reference to FIGS. 2B and 3B.
  • the light extraction unit 241f shown in FIG. 5A has an optical functional layer 249 including a prism unit 248 on the surface.
  • the optical functional layer 249 is provided on the second main surface 24.
  • the prism portion 248 is a portion including a fine slope capable of deflecting light.
  • a solar cell panel 6 is provided on the optical functional layer 249 (on the negative side of the Y-axis).
  • the optical functional layer 249 is preferably made of a material having a refractive index close to that of the light guide plate 2 in order to suppress refraction and reflection of light at the interface between the light guide plate 2 and the light extraction unit 241f. It can be configured to include the same PMMA.
  • a plurality of prism portions 248 are regularly or randomly provided on the surface of the optical functional layer 249. The size of the prism portion 248 and the adjacent spacing can be appropriately selected within a range that can be formed on the optical functional layer 249.
  • the same method as the above-mentioned method for forming a fine pattern on the second film 2432 can be applied to the formation of the prism portion 248 on the optical functional layer 249.
  • the light guided in the light guide plate 2 passes through the interface between the light guide plate 2 and the optical functional layer 249 or is refracted at the interface and enters the inside of the optical functional layer 243. Then, the light is guided in the optical functional layer 249, reflected by the prism portion 248, and guided toward the light emitting portion 231. Of the reflected light, the light incident on the first main surface 23 at an angle exceeding the critical angle is emitted from the inside of the light guide plate 2 to the outside. The portion of the first main surface 23 from which light is emitted corresponds to the light emitting portion 231. The above reflection is performed by a plurality of prism portions 248 provided on the optical functional layer 249.
  • the light extraction unit 241f can emit light from the entire light emission unit 231 along the plane of the first main surface 23 in the positive direction of the Y axis. It is preferable that the angle of the slope in the prism portion 248 is set to an angle suitable for illuminating the inside of the building.
  • the light extraction unit 241 g shown in FIG. 5B has an optical functional layer 251 including an uneven portion 250 on the surface.
  • the optical functional layer 251 is provided on the second main surface 24.
  • the material of the optical functional layer 251 is the same as that of the optical functional layer 249 described above.
  • the uneven portion 250 is a portion in which a plurality of concave portions or convex portions having a width and height of about 1 to 5 ⁇ m are formed.
  • the uneven portion 250 is randomly formed on the surface of the optical functional layer 251 and scatters the light guided in the optical functional layer 251.
  • a solar cell panel 6 is provided on the optical functional layer 251 (on the negative side of the Y-axis).
  • the same method as the above-mentioned method for forming a fine pattern on the second film 2432 can be applied to the formation of the uneven portion 250 on the optical functional layer 251. Further, since the uneven portion 250 may have a random rough surface, blasting or the like can be applied.
  • the light guided in the light guide plate 2 passes through the interface between the light guide plate 2 and the optical functional layer 251 or is refracted at the interface and is incident on the inside of the optical functional layer 251. Then, a part of the light guided in the optical functional layer 251 is scattered at the interface between the optical functional layer 251 and the uneven portion 250, and is guided toward the light emitting portion 231. Of the scattered light, the light incident on the first main surface 23 at an angle exceeding the critical angle is emitted from the inside of the light guide plate 2 to the outside. The portion of the first main surface 23 from which light is emitted corresponds to the light emitting portion 231. The above-mentioned scattering is performed at each of the plurality of uneven portions 250 provided on the optical functional layer 251.
  • the light extraction unit 241g can emit light from the entire light emission unit 231 along the plane of the first main surface 23 in the positive direction of the Y axis.
  • the light extraction unit 241h shown in FIG. 6A has an optical functional layer 249 including a prism unit 248 on the surface.
  • the optical functional layer 249 is provided on the first main surface 23.
  • a solar cell panel 6 is provided on the second main surface 24 (on the negative side of the Y-axis).
  • the material and function of the optical functional layer 249 are the same as those of the optical functional layer 249 in the light extraction unit 241f, but in this case, reflection is performed on a surface other than the slope such as a surface 248'which is substantially parallel to the Y axis in the prism unit 248. There will be more light.
  • the portion of the first main surface 23 provided with the optical functional layer 249 corresponds to the light emitting portion 231.
  • the light extraction unit 241i shown in FIG. 6B has an optical functional layer 251 including an uneven portion 250 on the surface.
  • the optical functional layer 251 is provided on the first main surface 23.
  • a solar cell panel 6 is provided on the second main surface 24 (on the negative side of the Y-axis).
  • the material and function of the optical functional layer 251 are the same as those of the optical functional layer 251 in the light extraction unit 241 g.
  • the portion provided with the optical functional layer 251 corresponds to the light emitting portion 231.
  • the light extraction unit 241j shown in FIG. 7A has a prism unit 252.
  • the prism portion 252 is formed on the second main surface 24.
  • the prism portion 252 is a portion including a fine slope capable of deflecting light.
  • a plurality of prism portions 252 are regularly or randomly provided on the surface of the second main surface 24.
  • a solar cell panel 6 is provided on the prism portion 252 (on the negative side of the Y-axis) provided on the second main surface 24.
  • the size of the slope and the adjacent spacing in the prism portion 252 can be appropriately selected within a range that can be formed on the second main surface 24.
  • the light deflected by the prism unit 252 passes through the light emitting unit 231 and is emitted.
  • the same method as the above-mentioned method for forming the prism portion 248 on the optical functional layer 249 can be applied to the formation of the prism portion 252 on the second main surface 24. Further, the function of the prism unit 252 is the same as that of the prism unit 248 described with reference to FIGS. 5A and 6A.
  • the light extraction unit 241k shown in FIG. 7B has an uneven portion 253.
  • the uneven portion 253 is formed on the second main surface 24.
  • a solar cell panel 6 is provided on the uneven portion 253 (Y-axis negative side) formed on the second main surface 24.
  • the uneven portion 253 is a portion in which a plurality of concave portions or convex portions having a width and height of about 1 to 5 ⁇ m are formed.
  • the uneven portion 253 is randomly formed on the second main surface 24 and scatters the light guided in the light guide plate 2. The light scattered by the uneven portion 253 passes through the light emitting portion 231 and is emitted.
  • the same method as the above-mentioned method for forming the uneven portion 250 on the optical functional layer 251 can be applied to the formation of the uneven portion 253 on the second main surface 24. Further, the function of the uneven portion 253 is the same as that of the uneven portion 250 described with reference to FIGS. 5B and 6B.
  • the light extraction unit 241 m shown in FIG. 8A has a prism unit 252.
  • the prism portion 252 is formed on the first main surface 23.
  • a solar cell panel 6 is provided on the second main surface 24 (on the negative side of the Y-axis).
  • the prism portion 252 is the same as the prism portion 252 in the light extraction portion 241j, but in this case, more light is reflected on a surface other than the slope such as a surface 252'which is substantially parallel to the Y axis in the prism portion 252.
  • the portion in which the plurality of prism portions 252 are formed in the first main surface 23 corresponds to the light emitting portion 231.
  • the light extraction unit 241n shown in FIG. 8B has an uneven portion 253.
  • the uneven portion 253 is formed on the first main surface 23.
  • a solar cell panel 6 is provided on the second main surface 24 (on the negative side of the Y-axis).
  • the uneven portion 253 is the same as the uneven portion 253 in the light extraction portion 241k.
  • the portion in which the plurality of uneven portions 253 are formed in the first main surface 23 corresponds to the light emitting portion 231.
  • the window lighting device 100 receives a light source, a light guide plate for guiding light emitted from the light source, a power source for supplying driving power to the light source, and sunlight. It has an optical power generation unit that generates electricity.
  • the light emitted from the light source enters the light guide plate from the light incident end face facing the light source, is guided in the light guide plate, and then emits light included in a predetermined main surface of the light guide plate intersecting the light incident end face. It emits from the part.
  • the photovoltaic power generation unit is provided on at least a part of the light guide plate on the opposite main surface side facing the predetermined main surface, and supplies the generated power generated by receiving sunlight to the power source. This makes it possible to save electricity by using sunlight.
  • the light extraction unit it is also possible to configure a lighting device by combining these. Further, it is also possible to give anisotropy to the spreading angle of the light emitted from the light emitting unit. For example, it is possible to emit light having a large spread angle in the X-axis direction and a small spread angle in the Z-axis direction in FIGS. 1A and 1B from the light emitting unit.
  • the configuration of the rectangular window lighting device that can be attached to the rectangular window is illustrated in the plan view, but the present invention is not limited to this. It is also possible to configure the window lighting device with a shape that matches the shape of the window to be attached. For example, in a plan view, it can be made into a circular shape, an elliptical shape, a semicircular shape, or the like. In this case, a light guide plate having a shape suitable for the window is used. Further, since it is preferable that the distance from the light source to the light incident end surface of the light guide plate is constant, when a light guide plate other than a rectangle is used, the light source may be arranged according to the shape of the light incident end surface of the light guide plate. preferable. For example, when a circular light guide plate is used, it is preferable to arrange a plurality of LEDs as a light source in an arc shape according to the shape of the light incident end face of the light guide plate.
  • the configuration of the window lighting device using the flat plate-shaped light guide plate is exemplified, but the window lighting device can also be configured by using the light guide plate including at least a part of the curved surface.
  • window lighting device is retrofitted to an existing window in a building
  • present invention is not limited to this.
  • Window lighting can also be installed on the windows of a building at the stage of construction.
  • a low refractive index layer having a low refractive index with respect to the light guide plate on at least a part of the first main surface or at least one of the second main surfaces of the light guide plate. It prevents the loss of light guided in the light guide plate due to the above, and improves the efficiency of light utilization.
  • the low refractive index layer may be provided by being formed on at least a part of the first main surface or at least one of the second main surfaces of the light guide plate, or may be provided with an adhesive (including a pressure-sensitive adhesive). ) May be provided by being coupled to the light guide plate.
  • FIG. 9A and 9B are views for explaining an example of the function of the low refractive index layer 34 in the window lighting device 100a
  • FIG. 9A is a view showing the vicinity of the surface of the light guide plate according to the present embodiment
  • FIG. 9B is a comparative example. It is a figure which shows the vicinity of the surface of the light guide plate which concerns on.
  • the window lighting device 100a has a light guide unit 300a.
  • the optical functional layer 243, the low refractive index layer 34, and the cover layer 35 are laminated and formed on the surface of the light guide plate 2 in this order.
  • a solar cell panel 6 is provided on the cover layer 35 (on the negative side of the Y-axis).
  • a layer having another function may be included between the surface of the light guide plate 2 and the low refractive index layer 34.
  • the visible light transmittance of the light guide portion 300a having the light guide plate 2, the optical functional layer 243, the low refractive index layer 34 and the cover layer 35 is preferably 60% or more, 65% or more, 70% or more, 75% or more. , 80% or more, 85% or more, or 90% or more.
  • the visible light transmittance is specified as an average value of the transmittance at each wavelength when measured at a measurement wavelength of 380 nm or more and 780 nm or less using a spectrophotometer.
  • the low refractive index layer 34 is a layer having a low refractive index with respect to the refractive index of the light guide plate 2.
  • the refractive index n 1 of the light guide plate 2 is around 1.49.
  • the refractive index n 2 of the low refractive index layer 34 is preferably 1.30 or less, and more preferably 1.20 or less.
  • the low refractive index layer is not particularly limited, but for example, a low refractive index layer having voids disclosed in International Publication No. 2019/146628 can be used. This content is incorporated herein by reference.
  • the cover layer 35 is for protecting the light guide plate 2, and is preferably one having high transparency to visible light. It may be made of glass, plastic or the like and have an ultraviolet absorbing effect. From the viewpoint of a protective layer, it is better to have high strength, but a thin and flexible layer may be used.
  • the optical functional layer 243 and the cover layer 35 are laminated and formed in this order on the surface of the light guide plate 2 included in the light guide unit 300X, and have low refractive index. There is no rate layer. In this case, if foreign matter C such as scratches, dirt, fingerprints, sweat, and dust adheres to the surface of the cover layer 35, among the light guided in the light guide plate 2, the light directed toward the cover layer 35 side is emitted. , Foreign matter C may scatter and leak to the outside from the light guide plate 2 to cause light loss.
  • the inside of the light guide plate caused by scratches, stains, fingerprints, etc. is formed. It is possible to prevent the loss of the guided light and improve the light utilization efficiency.
  • the above effect can be obtained by providing a low refractive index layer on at least a part of the first main surface or at least one of the second main surfaces of the light guide plate. Further, the above effect can be obtained even if the low refractive index layer is provided in the region where the optical functional layer is not provided on the first main surface or at least one of the second main surfaces. Further, in FIGS. 9A and 9B, the configuration in which the low refractive index layer is provided on the optical functional layer including the optical cavity is exemplified, but the low refractive index layer can also be provided on the optical functional layer containing light scattering particles. ..
  • Light source 2 Light guide plate 21 Light incident end face 22 End face 23 First main surface (example of predetermined main surface) 231 Light emitting part 24 Second main surface (an example of facing main surface) 241 Light extraction part 242,246 Light cavity (an example of a gap part) 243,245,249,251 Optical function layer 2431 First film 2432 Second film 244,247 Light scattering particles 248,252 Prism part 250,253 Concavo-convex part 3 Drive circuit 34 Low refractive index layer 35 Cover layer 4 Switch 5 Battery ( Example of power supply) 6 Solar cell panel (an example of a photovoltaic power generation unit) 100 Window lighting device 200 Window 210 Sash 220 Window glass 300 Light guide unit XX axis direction (width direction) Y Y axis direction (depth direction) Z Z axis direction (height direction)

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Planar Illumination Modules (AREA)

Abstract

L'invention concerne un dispositif d'éclairage de fenêtre permettant de réaliser des économies d'énergie au moyen de la lumière solaire. Le dispositif d'éclairage de fenêtre présente une source de lumière, une partie de guidage de lumière et une alimentation électrique qui fournit de l'énergie électrique à la source de lumière. La partie de guidage de lumière présente une plaque de guidage de lumière qui guide la lumière émise par la source de lumière, et une unité photovoltaïque qui reçoit la lumière solaire pour générer de l'énergie électrique. La plaque de guidage de lumière présente : une surface d'extrémité d'incidence de lumière qui est opposée à la source de lumière et sur laquelle une lumière émise par la source de lumière est incidente ; et une partie d'émission de lumière qui est incluse dans un plan principal prédéterminé de la plaque de guidage de lumière, qui coupe la surface d'extrémité d'incidence de lumière, et à partir de laquelle une lumière guidée à l'intérieur de la plaque de guidage de lumière est émise. L'unité photovoltaïque est disposée, sur la plaque de guidage de lumière, sur le côté d'un plan principal opposé opposé au plan principal prédéterminé et fournit l'énergie électrique générée à l'alimentation électrique.
PCT/JP2021/026881 2020-07-28 2021-07-16 Dispositif d'éclairage de fenêtre WO2022024825A1 (fr)

Applications Claiming Priority (2)

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JP2020-127347 2020-07-28
JP2020127347A JP2023130531A (ja) 2020-07-28 2020-07-28 窓照明装置

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WO2022024825A1 true WO2022024825A1 (fr) 2022-02-03

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06208113A (ja) * 1993-01-12 1994-07-26 Asahi Chem Ind Co Ltd 面照明装置
JPH0882714A (ja) * 1994-09-12 1996-03-26 Nitsusen Kagaku Kk 面型照明装置
JP2006066619A (ja) * 2004-08-26 2006-03-09 Sharp Corp 光源一体型太陽電池モジュールおよびそれを用いた発電発光ユニット
WO2019182091A1 (fr) * 2018-03-22 2019-09-26 日東電工株式会社 Dispositif optique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06208113A (ja) * 1993-01-12 1994-07-26 Asahi Chem Ind Co Ltd 面照明装置
JPH0882714A (ja) * 1994-09-12 1996-03-26 Nitsusen Kagaku Kk 面型照明装置
JP2006066619A (ja) * 2004-08-26 2006-03-09 Sharp Corp 光源一体型太陽電池モジュールおよびそれを用いた発電発光ユニット
WO2019182091A1 (fr) * 2018-03-22 2019-09-26 日東電工株式会社 Dispositif optique

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