WO2013038769A1 - Artificial-sunlight projection device - Google Patents

Artificial-sunlight projection device Download PDF

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Publication number
WO2013038769A1
WO2013038769A1 PCT/JP2012/066113 JP2012066113W WO2013038769A1 WO 2013038769 A1 WO2013038769 A1 WO 2013038769A1 JP 2012066113 W JP2012066113 W JP 2012066113W WO 2013038769 A1 WO2013038769 A1 WO 2013038769A1
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WO
WIPO (PCT)
Prior art keywords
light
guide member
light guide
pseudo
sunlight
Prior art date
Application number
PCT/JP2012/066113
Other languages
French (fr)
Japanese (ja)
Inventor
南　功治
Original Assignee
シャープ株式会社
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Filing date
Publication date
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Publication of WO2013038769A1 publication Critical patent/WO2013038769A1/en

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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
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/006—Solar simulators, e.g. for testing photovoltaic panels
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0028—Light guide, e.g. taper
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources

Definitions

  • the present invention relates to a simulated sunlight irradiation apparatus that irradiates simulated sunlight.
  • the light source lamp installed in the simulated sunlight irradiation device is a point-like or linear light source. For this reason, it is very difficult to irradiate the pseudo-sunlight with uniform illuminance on the front surface of the planar light receiving surface in the solar cell. Accordingly, various techniques for adjusting the illuminance unevenness of the simulated solar light irradiation device have been developed.
  • Patent Document 1 discloses an example of a light source device that irradiates a surface.
  • FIG. 10 is a schematic cross-sectional view of the light source device disclosed in the document.
  • This apparatus takes out the light emitted from the light source 301 from the reflection box 302 formed with a plurality of openings 303, guides the light through the plurality of directivity control members 304 arranged in the openings 303, and directs the directivity. Is irradiated to irradiate the object.
  • the directivity of light is individually imparted to the light emitted from the opening 303 of the reflection box 302 and is independently irradiated with the surface.
  • an optical filter that adjusts artificial light to an emission spectrum close to sunlight is disposed on the exit surface of the directivity control member 304, It is necessary to form an optical system.
  • the optical filter in order to obtain the same optical performance over the entire irradiated surface, the optical filter must also be disposed over the entire exit surface so that light with uniform directivity is incident on the optical filter. Since the optical filter is composed of a multilayer filter, the transmission characteristics change if the incident direction is different.
  • the reflection box 302 shown in Patent Document 1 has an elongated box shape. For this reason, the light from the light source 301 is reflected in all directions inside, and the directivity of the emitted light differs depending on the position of the opening 303. As a result, the light incident on the directivity control member 304 is also different, and the characteristics of the light emitted from each directivity control member 304 vary. When such uneven light is incident on the optical filter, pseudo-sunlight different from the spectrum distribution of the reference sunlight is generated.
  • the pseudo sunlight is formed using different types of light sources such as a xenon lamp and a halogen lamp so as to be advantageous in forming the pseudo sunlight having a high degree of spectrum matching.
  • the degree of mixing of xenon light and halogen light is slightly different depending on the traveling direction of light from each lamp. As a result, it is difficult to make the degree of coincidence of the spectrum uniform over the entire irradiated surface. Therefore, it is not possible to configure a pseudo-sunlight irradiation device having a high spectrum matching degree.
  • sunlight has the property that light is parallel light and travels without spreading, and pseudo-sunlight is also required to improve the directivity of light.
  • Patent Document 1 it can be expected that the directivity of the emitted light from the directivity control member 304 is increased by the effect of the directivity control member 304.
  • the reflection box 302 has a long and narrow box shape as described above, the characteristics of the emitted light differ depending on the position of the opening 303, so light with low directivity may be mixed. Further, the light from the gap between the opening 303 and the directivity control member 304 is emitted without improving the directivity. In this way, light with low directivity that does not contribute to power generation of the solar cell is also incident on the solar cell, and pseudo-sunlight with high directivity close to the reference sunlight cannot be obtained.
  • the present invention has been made in view of the above-described problems, and the object thereof is to control the light spectrum with high accuracy and to align the directivity without greatly degrading the directivity of light.
  • An object of the present invention is to provide a pseudo-sunlight irradiation device that can irradiate an irradiated object such as a solar cell.
  • the pseudo-sunlight irradiation apparatus includes a member that increases the directivity of the emitted light from the light source, a spectrum adjusting member that controls the transmittance of the emitted light from the light source, and light that has passed through the spectrum adjusting member.
  • a member that increases the directivity of the emitted light from the light source a spectrum adjusting member that controls the transmittance of the emitted light from the light source, and light that has passed through the spectrum adjusting member.
  • light extraction means that is disposed on the light guide member and takes out the light incident on the light guide member to the irradiation surface of the light guide member, and light emitted from the emission surface of the light guide member
  • a light refracting member that refracts the light in the irradiation direction is provided.
  • the directivity of the emitted light from the light source is improved by the member that increases the directivity, and the spectrum distribution is made closer to sunlight by the spectrum adjusting member. Then, the light whose directivity and spectral distribution are adjusted in this way enters the light guide member.
  • the light incident on the light guide member is taken out by the light extraction means to the irradiation surface of the light guide member.
  • the emitted light from the light guide member is refracted in the irradiated direction by the light refraction member. Therefore, the light spectrum can be controlled with high accuracy, and light with uniform directivity can be irradiated to an irradiated object such as a solar cell without greatly reducing the directivity of light.
  • the light spectrum can be controlled with high accuracy, and light with uniform directivity can be irradiated without reducing the directivity of the light, such as a solar cell. Can be obtained.
  • FIG. 1 It is a schematic block diagram which shows the simulated sunlight irradiation apparatus which concerns on 1st embodiment. It is the schematic which shows a part of light introduction part in the said simulated sunlight irradiation apparatus.
  • A is a figure which shows the vicinity of a light refraction member
  • (b) is the figure which expanded the light refraction part in a light refraction member. It is the figure which showed the directivity of light when changing the direction of the light refraction part in a photorefractive member.
  • FIG. 1 is a diagram showing a schematic configuration of a simulated solar light irradiation apparatus 100 in the present embodiment.
  • the simulated sunlight irradiation device 100 includes a light introduction unit 10a, 10b including a light source 1, a light collecting element 2, a taper coupler 3, light shielding members 4a, 4b, and a spectrum adjusting member 5, a light guide member 6, a light extraction means 7, and light. It comprises a refractive member 8 and a transparent cover 9.
  • the simulated sunlight irradiation device 100 emits simulated sunlight from an emission surface of the light guide member 6 to an irradiated object such as a solar cell.
  • the light emission surface side of the light guide member 6 is the upper surface, and the opposite side to the emission surface is the lower surface.
  • the light source 1 irradiates light having a spectral distribution necessary for generating simulated sunlight, and for example, a xenon lamp or a halogen lamp is used.
  • a light source that is rod-shaped in the direction perpendicular to the paper surface of FIG. 1 is used.
  • the light source is not limited to this rod shape, and for example, a point light source may be used.
  • the light collecting element 2 is surrounded by the light source 1 except for the direction of emission to the taper coupler 3. Of the light emitted from the light source 1, the light that does not go to the taper coupler 3 is reflected by the light collecting element 2 and emitted toward the taper coupler 3.
  • an elliptical mirror, a parabolic mirror, or the like is used as the condensing element 2, and the light output from the light source 1 is collected and emitted. Therefore, the output light from the light source 1 is used effectively.
  • the taper coupler 3 is provided between the light source 1 and the spectrum adjustment member 5.
  • the end of the taper coupler 3 is disposed close to the light source 1, and the other end is disposed close to the spectrum adjusting member 5.
  • the light shielding members 4 a and 4 b are attached to the light collecting element 2 and surround the incident surface of the taper coupler 3. Thereby, the light emitted from the light source 1 toward the taper coupler 3 and not incident on the incident surface is reflected by the light shielding members 4 a and 4 b and is emitted toward the taper coupler 3 again. Therefore, the output light from the light source 1 is used effectively.
  • the spectrum adjusting member 5 is an optical element that increases the closeness to the solar spectrum by adjusting the transmittance of a specific wavelength in the spectrum of the light emitted from the light source 1, and is usually called an air mass filter.
  • the spectrum adjusting member 5 is provided in the vicinity of the exit surface of the taper coupler 3, so that the light whose spectrum has been adjusted enters the light guide member 6.
  • the light guide member 6 is provided between the light introducing portions 10a and 10b arranged to face each other.
  • the artificial sunlight that is incident on both side surfaces of the light guide member 6 from the light introducing portions 10 a and 10 b is irradiated to the irradiated object from the exit surface of the light guide member 6.
  • the light extraction means 7 is formed on the lower surface of the light guide member 6.
  • the light extraction means 7 extracts the pseudo sunlight emitted from the light introducing portions 10 a and 10 b to the emission surface of the light guide member 6. Specifically, the light incident on the light guide member 6 from the light introducing portions 10 a and 10 b propagates inside the light guide member 6. At this time, the light hitting the light extraction means 7 is emitted to the emission surface of the light guide member 6.
  • the light extraction means 7 can be formed from a scatterer, for example, and can scatter the pseudo sunlight inside the light guide member 6 and guide it to the emission surface. Moreover, if the pattern of the scatterer is changed, the illuminance unevenness of the simulated sunlight can be adjusted.
  • the light refracting member 8 produces a large amount of irradiation light component perpendicular to the irradiation surface of the light guide member 6 by the light refraction effect.
  • the light refracting member 8 is a member for refracting the light extracted from the light guide member 6 by the light extraction means 7 in a direction perpendicular to the exit surface of the light guide member 6.
  • the transparent cover 9 covers the light exit surface of the light guide member 6 and protects the light guide member 6.
  • the principle of imparting directivity is that the condensing element 2 is, for example, an elliptical mirror, and as a property, light gathers at the focal point of the elliptical surface, and directivity corresponding to the condensing angle at the time of condensing is obtained.
  • a rod-shaped light source is used, but when a point light source is used, the shape of the light collecting element 2 may be adjusted as appropriate.
  • the light shielding members 4a and 4b remove light having low directivity that does not enter the taper coupler 3 without entering the taper coupler 3, and reflect light emitted from the light source 1 and not incident on the taper coupler 3. Then, it is reflected again by the condensing element 2 and is incident on the taper coupler 3.
  • the radiation directivity of the light output from the light source 1 is also controlled by the taper coupler 3, and the light emitted from the taper coupler 3 is given directivity in the xz plane of FIG. 1, that is, in both the x-axis and z-axis directions. Is done.
  • FIG. 2 is a diagram illustrating a part of the light introducing unit 10 in the simulated solar light irradiation apparatus 100, and is a top view of the light introducing unit 10 viewed from the Z direction in FIG.
  • the taper coupler 3 has a pair of opposing surfaces that are tapered. That is, the cross-sectional area of the taper coupler 3 gradually increases from the incident surface of the taper coupler 3 toward the output surface. With such a structure, the light output from the light source 1 is repeatedly reflected on the side surface of the taper coupler 3 to improve the directivity. For example, in FIG. 2, the light L emitted from the light source 1 is condensed within the critical angle of the taper coupler 3 and totally reflected by Snell's law.
  • the totally reflected light reaches the outer wall which is the opposite surface, and is totally reflected again here. Since the taper coupler 3 gradually spreads from the incident surface toward the exit surface, the reflected light gradually changes to light perpendicular to the entrance surface (or the exit surface) by repeating such reflection. Thus, finally, light having high directivity, that is, light having uniform directivity is emitted from the emission surface. At this time, since the light incident on the taper coupler 3 only repeats total reflection, most of the incident light becomes emitted light, and high emission efficiency can be obtained. In this way, light having directivity aligned in a direction substantially perpendicular to the emission surface of the taper coupler 3 is emitted from the emission surface of the taper coupler 3.
  • the advantage of aligning the directivity of light with the taper coupler 3 is related to the structure of the spectrum adjusting member 5.
  • the transmittance control is performed so as to match the reference sunlight, it is effective to form the spectrum adjusting member 5 by forming an optical multilayer film on a glass member.
  • the transmittance characteristic also changes. That is, when light with poor directivity is incident on the spectrum adjustment member 5, pseudo-sunlight having a spectrum distribution deviating from the spectrum distribution of the reference sunlight is generated.
  • the directivity of light is made uniform using the taper coupler 3, it is possible to generate pseudo sunlight that is close to the spectrum distribution of the reference sunlight.
  • the light emitted from the taper coupler 3 has an incident angle range of ⁇ 30 ° or less with respect to the spectrum adjusting member 5.
  • This optical multilayer film is designed so that a predetermined transmission characteristic can be obtained when the incident angle is 0 °, that is, when the optical multilayer film is incident perpendicularly to the multilayer film. For this reason, the vertical phase shift of incident light to the multilayer film is about 14% at 1-cos 30 °. Therefore, even when the incident angle component spreads from 0 ° to 30 °, the phase shift amount becomes an average value from 0% to 14%, and the multilayer film with respect to the case where the designed incident angle is incident at 0 ° Variation in transmittance at the time of incidence is reduced.
  • the controllability of the spectrum is improved, and pseudo-sunlight closer to the reference sunlight can be formed.
  • the light obtained by passing through the spectrum adjusting member 5 is closer to the design, that is, closer to actual sunlight.
  • the spectrum coincidence of the pseudo-sunlight can be JIS MS-class light whose deviation from the reference sunlight is within ⁇ 5%.
  • the spectrum adjusting member 5 adjusts the transmittance of the spectrum of the light output from the light source 1 to form light called pseudo-sunlight.
  • the light transmitted through the spectrum adjusting member 5 and entering the light guide member 6 is guided from the light guide member 6 by breaking the total reflection condition by the light extraction means 7 while propagating through the light guide member 6. Radiated above the member 6.
  • the light guide member 6 is made of highly transmissive glass such as quartz, the emission spectrum of the light whose spectrum is adjusted by the spectrum adjustment member 5 before being emitted from the light guide member 6 is not disturbed.
  • the light emitted from the light guide member 6 passes through the light refraction member 8.
  • the function of the photorefractive member 8 is as follows.
  • the incident directivity to the light guide member 6 decreases, the directivity of the light when emitted from the light guide member 6 increases the amount of light deviating from the incident angle range to the solar cell in which the power generation performance is maintained. There are more factors that make it impossible to measure the quantity accurately.
  • the direction in which the light is irradiated must be set correctly at a predetermined angle.
  • the directivity of light deteriorates, when the light emitted from the light guide member 6 reaches the solar cell, the component ratio of light deviated from the vertical direction with respect to the solar cell increases. Even if the reflectance of the surface or interface is changed due to a shift in the incident angle to the solar cell, the light amount is reduced. Furthermore, the spectrum of the light incident on the solar cell also changes due to the wavelength dependence of the reflection characteristics when the incident angle to the solar cell shifts, and the degree of coincidence of the spectrum of the irradiated light also decreases. As a result, it is not possible to correctly evaluate the power generation of the solar cell by the pseudo-sunlight irradiation having a high degree of spectral coincidence.
  • the light radiated from the light guide member 6 is refracted in a direction as perpendicular as possible to the light exit surface of the light guide member 6, so that the light refraction member 8 is refracted. It is possible to create many components of vertical irradiation light and to approximate the characteristics of the reference sunlight.
  • FIG. 3A is a view showing the vicinity of the light refracting member 8, and FIG. 3B is an enlarged view of the portion of the light refracting member 8.
  • the light refraction member 8 includes a continuous light refraction part 81 as shown in FIG.
  • the light refracting portion 81 is made of, for example, an ultraviolet transparent acrylic resin and has a belt shape of a substantially equilateral triangle in section extending in the depth direction of the paper surface in FIG. It arrange
  • the light refracting unit 81 has an equilateral triangle or a shape close to an equilateral triangle in a cross section perpendicular to the exit surface of the light guide member 6.
  • the material of the light refracting member 8 and the light refracting portion 81 a PC-based resin, a PET-based resin, and a glass-based material that can obtain a refractive index of about 1.5 are preferably used.
  • the light guide member 6 preferably has a refractive index of 1.45 to 1.55.
  • the light refracting portion 81 is on the light guide member 6 side opposite to the light irradiation direction, and arranged so that one vertex faces the light guide member 6. is there. With such a configuration, the emitted light can be refracted without spreading so much from the direction perpendicular to the light guide member 6.
  • the principle is as follows.
  • the first refraction direction in the light refraction part 81 is close to the light guide direction, and the light is totally reflected inside the light refraction part 81.
  • the directivity is incident on the light guide member 6 at 30 ° or less, the light propagating through the light guide member 6 is 0 due to the refracting action on the surface of the light guide member 6. It is light of a component that is larger than ° and about 20 ° or smaller.
  • the angle component in the case where these lights deviate from the total reflection condition and exit from the light guide member 6 is in the range of an angle of 0 ° to 30 ° away from the surface of the light guide member 6 and is 15 ° which is the center thereof.
  • light is emitted in a direction centered on a direction away from the surface of the light guide member 6.
  • the light guide member 6 When light is incident on the light guide member 6 with the directivity of 30 ° or less, that is, the surface of the light guide member 6 at an angle from 0 ° to 30 ° as shown by a light beam 50c in FIG.
  • the angle of the light refracting portion 81 is a triangular shape with an apex angle of 60 °, the light refracting portion 81 refracts the light perpendicular to the light guide member 6. Centered refraction is possible. Accordingly, when light is incident from both sides of the light guide member 6 as shown in FIG. 3A, the shape of the light refracting portion 81 effective for irradiating the light guide member 6 in the vertical direction is an apex angle 60. It becomes a substantially equilateral triangle shape of °.
  • the light refraction part 81 is formed in the light guide member 6 in a direction perpendicular to the paper surface in FIG. This is because the ratio of the light component having the irradiation direction component in the x direction in FIG. 3 is originally large, so that the light refracted in the direction substantially perpendicular to the light guide member 6 by the light refracting portion 81 greatly increases. This is because the reflection at the time of passing through the surface of 8 is greatly reduced and the light extraction efficiency is increased.
  • FIG. 4 is a diagram showing the directivity of light when the arrangement of the light refraction part 81 in the light refraction member 8 is changed.
  • 4A is similar to FIG. 3, when the light refracting portion 81 is disposed on the light guide member 6 side
  • FIG. 4B is a comparative example in which light is transmitted to the opposite side of the light guide member 6.
  • the directivity of light when the refracting portion 81 is arranged is shown.
  • the directivity in FIGS. 4 (a) and 4 (b) is the irradiation angle range in the xz plane of FIG. 1, where the emission angle of the light emitted from the light guide member 6 is the irradiation light. It is specified and expressed in an angle time range including 90% or more.
  • the light guide member 6 has a thickness of 10 mm
  • the light extraction means 7 uses a reflector formed of silica bead-mixed ink for printing, and introduces light from the end face of the light guide member 6.
  • the light to be introduced is light whose directivity is controlled from 0 ° to 30 ° by the taper coupler 3 through the spectrum adjusting member 5.
  • the directivity in the pseudo-sunlight irradiation device of the present embodiment is an equilateral triangular shape in which the refractive index of the material of the light refracting member 8 and the light refracting portion 81 is 1.5, and the shape of the light refracting portion 81 alone is 200 ⁇ m on a side. It is obtained when the apex angle is 60 °.
  • the material of the photorefractive member 81 an acrylic resin, a PET resin, or a glass material is preferably used.
  • the light refracting portion 81 When the light refracting portion 81 is arranged on the light guide member 6 side and irradiated with light as shown in FIG. 4A, light is not diffused as compared with the case of FIG. For this reason, the incident angle to the solar cell is reduced, and less light is reflected before reaching the power generation region of the solar cell, so that it is possible to prevent a decrease in the amount of power generation during irradiation with simulated sunlight.
  • the light refracting unit 81 further refracts light in a direction perpendicular to the light guide member 6. As shown in FIG. 3, in this embodiment, the light travels in a direction from one end face of the light guide member 6 toward the other end face as light rays 30 a and 30 b indicated by arrows when viewed largely.
  • the irradiated light since the same optical system (light introducing portions 10a and 10b) is arranged on both sides of the light guide member 6, the irradiated light has a good balance with similar directivity over the entire irradiation surface. Can be irradiated.
  • the light source 1 is not limited to the arrangement in which the light guide member 6 is incident from both sides, and the performance of irradiating pseudo-sunlight with uniform directivity can be maintained even in the structure in which the light source 1 is arranged on one side.
  • the light emission spectrum from when propagating through the light guiding member 6 until coming out of the light guiding member 6 does not change.
  • the light refracting member 8 is provided, even if the refraction direction is shifted depending on the wavelength when the light is refracted by the light refracting member 8, when light is emitted from the light guide member 6, if it is viewed in the entire wavelength range.
  • the light refraction direction is slightly shifted near an angle perpendicular to the light guide member 6. For this reason, the tendency that the central angle of the light refraction direction is an angle perpendicular to the light guide member 6 is maintained, and irradiation light incident at an angle centered on the vertical angle is also formed on the irradiated object.
  • the light extraction means 7 since light with high directivity is made incident on the light guide member 6, the light extraction means 7 also emits light from the light guide member 6 to the solar cell by the light extraction means 7. Even if the directivity is disturbed, the decrease in directivity is about + 15 °. Accordingly, the solar cell is irradiated with light with a small decrease in directivity, a high degree of spectrum matching, and high directivity, that is, with uniform directivity.
  • a structure may be provided in which distance holding members 40a and 40b for separating the distance from the solar cell 90 to the simulated solar light irradiation device 100 are provided.
  • the presence of the distance holding members 40a and 40b removes light components with very low directivity generated in the light extraction means 7, and relatively increases the incidence ratio of light with high directivity to the solar cell 90. be able to.
  • the light that has passed through the photorefractive member 8 passes through the transparent cover 9 and is applied to the solar cell 90.
  • the presence or absence of the transparent cover 9 is not related to the directivity at the time of irradiation, but the presence of the transparent cover 9 sandwiches the light refracting member 8 between the transparent cover 9 and the light guide member 6 so that the light refracting member 8 can be prevented from warping. Since the photorefractive member 8 does not warp, it is possible to irradiate the object to be measured with pseudo sunlight having more accurate directivity.
  • spacers 50a and 50b may be disposed between the light refraction member 8 and the transparent cover 9.
  • the light weight of the transparent cover 9 through the spacers 50a and 50b suppresses the warp of the light refracting member 8, controls the distance between the light refracting member 8 and the light guiding member 6 to be constant, and the light guiding member 6 and the light refracting member 8 Variation in the refraction of light due to the non-uniformity of the distance can be suppressed.
  • the spacers 50a and 50b and the transparent cover 9 form a space having a certain height therebetween.
  • the thickness of the light refracting member 8 is adjusted to the thickness of the spacers 50a and 50b, the light refracting member 8 does not warp, and as a result, the distance between the light refracting member 8 and the light guide member 6 is increased. Can be kept constant. Thereby, the control precision of a light irradiation direction can be raised, more light can be refracted
  • the spacers 50a and 50b are transparent so that the spacers 50a and 50b can be used even if they are large. Since the spacers 50a and 50b are transparent, it is possible to prevent the irradiation range from becoming narrow. Further, it is preferable that the surface of the transparent spacers 50a and 50b (that is, both the light guide member 6 side and the irradiation surface side) is provided with a antireflection coating such as a multilayer coating that reduces reflected light. Or when arrange
  • FIG. 7 is a plan view of the simulated sunlight irradiation device 100 as viewed from above.
  • the light source 1 is two, and the transparent cover 9 is abbreviate
  • the unit 60 a is configured to include the light introduction unit 10, the light guide member 6, the light extraction means 7 (not shown), the light refraction member 8, the spacers 50 a, 50 b, 50 c, and 50 d, and the other unit. 60b.
  • the unit 60a and the unit 60b have exactly the same configuration except that their directions are different.
  • the light refraction member 8 is preferably arranged so as to straddle the light guide member 6 in each unit.
  • the spacers 50a, 50b, 50c, and 50d are preferably arranged at positions that hold the four corners of the light guide members 6 of the units 60a and 60b. As a result, the distance between the light refraction member 8 and the light guide member 6 can be accurately maintained with the minimum necessary spacers.
  • FIG. 8 shows a simulated sunlight irradiation device in which the units 60a and 60b shown in FIG. 7 are continuously arranged so that the light guide members 6 are adjacent to each other. Also in this case, as described above, it is most preferable that the light refraction member 8 is disposed so as to straddle the light guide member 6 in each unit. Thus, even when the pseudo-sunlight irradiation device is enlarged, the light refraction member 8 straddles the light guide member 6 to reduce the influence of the illuminance deviation of the irradiation light from the joint of the light guide member 6 or the like. Can do.
  • FIG. 9 is a diagram showing a schematic configuration of the simulated solar light irradiation apparatus 200 in the second embodiment.
  • the simulated sunlight irradiation device 200 includes light introducing portions 10 c and 10 d, a light guide member 6, a light extraction means 7, a light refraction member 8, and a transparent cover 9.
  • the light introducing portions 10 c and 10 d are disposed on both side surfaces of the light guide member 6.
  • the light introduction part 10d has the same configuration as the light introduction part 10c.
  • the light introducing unit 10c includes a xenon light source 1a as a first light source, condensing elements 2a and 2b, taper couplers 3a and 3b, light shielding members 4c, 4d, 4e, and 4f, spectrum adjusting members 5a and 5b, It comprises a wavelength selection mirror 11 and a halogen light source 1b as a second light source.
  • the light introducing unit 10 c generates simulated sunlight by mixing the light emitted from the xenon light source 1 a and the halogen light source 1 b with the wavelength selection mirror 11, and irradiates the end surface of the light guide member 6 with the simulated sunlight.
  • the light from the xenon light source 1 a is guided by the wavelength selection mirror 11 to the light guide member 6 while reflecting the light on the short wavelength side and transmitting the light on the long wavelength side.
  • the light from the halogen light source 1 b is reflected by the wavelength selection mirror 11, the light on the long wavelength side is reflected, and the light on the short wavelength side is transmitted and guided to the light guide member 6.
  • the light exiting the xenon light source 1a exits the taper coupler 3a, which is a light guide member for imparting directivity, and then enters the spectrum adjusting member 5a.
  • the light emitted from the halogen light source 1b exits the taper coupler 3b and then enters the spectrum adjusting member 5b.
  • the respective lights are mixed in the wavelength selection mirror 11 and formed before one pseudo sunlight is incident on the light guide member 6.
  • the short wavelength component of the pseudo sunlight is formed from the xenon light source 1a, and the long wavelength component of the pseudo sunlight is formed from the halogen light source 1b.
  • the emission spectrum is adjusted by. Therefore, highly accurate simulated sunlight can be formed as a result.
  • the spectrum adjusting members 5a and 5b have two or more configurations, for example, by dividing the spectrum adjusting member into two sheets so that the product of the transmission characteristics is equivalent to the transmission characteristics for one sheet. It can also be. By doing in this way, a degree of spectrum agreement can be raised more.
  • the light introduced into the light guide member 6 is extracted to the outside of the light guide member 6 by the light extraction means 7, and pseudo sunlight is irradiated above the light guide member 6.
  • a first light source system (light introduction unit 10c) using the first light source
  • a second optical system (light introduction unit 10d) using the second light source
  • the degree of spectrum matching is further increased.
  • a xenon light source is used as the first light source
  • a halogen light source is used as the second light source.
  • the present invention is not limited to this, and any light source suitable for forming simulated sunlight can be used. .
  • the spectrum is adjusted with light having high directivity in order to control the spectrum with high accuracy, the light is incident on the light guide member 6, and the light is extracted from the light guide member 6 by the light extraction means 7.
  • the light refracting member 8 whose light refracting portion 81 is on the light guide member side opposite to the light irradiation direction, the spectrally adjusted light can be transmitted without greatly reducing the directivity thereof. Can be irradiated.
  • the light refraction member includes a prismatic light refraction part that refracts light, and the light refraction part is on the light guide member side opposite to the light irradiation direction. It may be characterized by that.
  • the cross section of the light refraction part may be a substantially equilateral triangle.
  • the light refraction portions may be adjacent to each other and continuously arranged.
  • the first refraction direction of the light of the light refraction unit may be the light guide direction of the light guide member.
  • the light refraction member may be disposed between a transparent cover and the light guide member.
  • a spacer for maintaining a distance may be disposed between the light refraction member and the transparent cover.
  • the spacer may have a function of reducing reflection.
  • the simulated sunlight irradiation device of the present invention a plurality of the light guide members are disposed, and the light refraction members are disposed so as to cover at least two boundaries of the plurality of light guide members. It is good.
  • the simulated solar light irradiation device of the present invention may include a distance holding member that holds the light refraction member and the object to be irradiated.

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Abstract

An artificial-sunlight projection device (100) comprises: a light source (1); a light collecting element (2) and a taper coupler (3), which are members that increase the directivity of light emitted from the light source (1); a spectrum adjustment member (5) which controls the transmission of the light emitted from the light source (1); a light guiding member (6) into which the light that has passed through the spectrum adjustment member (5) enters; a light extraction means (7) which is positioned within the light guiding member (6) and which extracts the light which has entered the light guiding member (6) into a projection surface of the light guiding member (6); and a light refracting member (8) which refracts light which is emitted from an emission surface of the light guiding member (6) in the projection direction.

Description

擬似太陽光照射装置Simulated solar irradiation device
　本発明は、擬似太陽光を照射する擬似太陽光照射装置に関する。 The present invention relates to a simulated sunlight irradiation apparatus that irradiates simulated sunlight.
　近年、クリーンなエネルギー源として太陽電池の重要性が認められ、その需要が高まりつつある。太陽電池が様々な分野で広く利用されるためには、太陽電池の特性、とりわけ出力特性が正確に測定されなければならない。従って、太陽電池の検査、測定、及び実験に利用可能な、太陽光に近い人工光、いわゆる擬似太陽光を照射できる装置の需要が高まっている。擬似太陽光に求められる主な要素は、その発光スペクトルを基準太陽光（日本工業規格により制定：ＪＩＳ：Ｃ８９４１）に近づけることである。言い換えれば、擬似太陽光照射装置は、擬似太陽光のスペクトルと基準太陽光との近接度を示すスペクトル合致度が高いことが要求される。また、被照射面に対して、均一照度で指向性の高い光を照射することが求められる。 In recent years, the importance of solar cells as a clean energy source has been recognized, and the demand for them is increasing. In order for a solar cell to be widely used in various fields, the characteristics of the solar cell, particularly the output characteristics, must be accurately measured. Accordingly, there is an increasing demand for devices that can irradiate artificial light close to sunlight, so-called pseudo sunlight, which can be used for inspection, measurement, and experimentation of solar cells. The main element required for pseudo-sunlight is to bring its emission spectrum closer to reference sunlight (established by Japanese Industrial Standards: JIS: C8941). In other words, the simulated sunlight irradiation device is required to have a high degree of spectrum matching that indicates the proximity between the spectrum of the simulated sunlight and the reference sunlight. In addition, it is required to irradiate the irradiated surface with light having uniform illuminance and high directivity.
　しかしながら、擬似太陽光照射装置に設置される光源ランプは、点状、または線状の光源である。このため、太陽電池における面状の受光面前面に対して均一照度で、擬似太陽光を照射することはきわめて困難である。そこで、擬似太陽光照射装置の照度ムラを調整する技術が種々開発されている。 However, the light source lamp installed in the simulated sunlight irradiation device is a point-like or linear light source. For this reason, it is very difficult to irradiate the pseudo-sunlight with uniform illuminance on the front surface of the planar light receiving surface in the solar cell. Accordingly, various techniques for adjusting the illuminance unevenness of the simulated solar light irradiation device have been developed.
　特許文献１には、面状に照射する光源装置の一例が開示されている。図１０は該文献に示された光源装置の概略断面図である。この装置は、光源３０１から出射された光を複数の開口部３０３を形成した反射箱３０２から取り出し、開口部３０３に配置された複数の指向性制御部材３０４の中を導光させて、指向性を制御して被照射物を照射する。光の指向性は反射箱３０２の開口部３０３から出た光に個々に付与されて、それぞれ独立して面照射される。 Patent Document 1 discloses an example of a light source device that irradiates a surface. FIG. 10 is a schematic cross-sectional view of the light source device disclosed in the document. This apparatus takes out the light emitted from the light source 301 from the reflection box 302 formed with a plurality of openings 303, guides the light through the plurality of directivity control members 304 arranged in the openings 303, and directs the directivity. Is irradiated to irradiate the object. The directivity of light is individually imparted to the light emitted from the opening 303 of the reflection box 302 and is independently irradiated with the surface.
日本国公開特許公報「特開２００３－９８３５４号公報（２００３年４月３日公開）」Japanese Patent Publication “JP 2003-98354 A (published on April 3, 2003)”
　特許文献１に示された光源装置を用いて、擬似太陽光を照射する場合、人工の光を太陽光に近い発光スペクトルに調整する光学フィルタを指向性制御部材３０４の出射面に配置して、光学系を形成する必要がある。また、被照射面全面に同一の光学性能を得るためには、光学フィルタも出射面全面に配置し、指向性の揃った光を光学フィルタに入射するようにしなければならない。光学フィルタは多層膜フィルタで構成されているため、入射方向が異なると透過特性も変化してしまう。 When irradiating simulated sunlight using the light source device shown in Patent Document 1, an optical filter that adjusts artificial light to an emission spectrum close to sunlight is disposed on the exit surface of the directivity control member 304, It is necessary to form an optical system. In addition, in order to obtain the same optical performance over the entire irradiated surface, the optical filter must also be disposed over the entire exit surface so that light with uniform directivity is incident on the optical filter. Since the optical filter is composed of a multilayer filter, the transmission characteristics change if the incident direction is different.
　特許文献１に示された反射箱３０２は、細長い箱形状となっている。このため、光源３０１からの光が内部であらゆる方向に反射し、開口部３０３の位置によって出射する光の指向性が異なる。その結果、指向性制御部材３０４に入射する光も異なり、それぞれの指向性制御部材３０４から出射する光の特性にばらつきが生じる。そのようなばらつきのある光が光学フィルタに入射すると、基準太陽光のスペクトル分布とは異なる擬似太陽光を生成してしまう。 The reflection box 302 shown in Patent Document 1 has an elongated box shape. For this reason, the light from the light source 301 is reflected in all directions inside, and the directivity of the emitted light differs depending on the position of the opening 303. As a result, the light incident on the directivity control member 304 is also different, and the characteristics of the light emitted from each directivity control member 304 vary. When such uneven light is incident on the optical filter, pseudo-sunlight different from the spectrum distribution of the reference sunlight is generated.
　さらに、スペクトル合致度の高い擬似太陽光を形成するのに有利なように、例えばキセノンランプとハロゲンランプなどのように種類の異なる光源を用いて擬似太陽光を形成するとする。この場合においても、それぞれのランプからの光の進行方向によってキセノン光とハロゲン光の混合の度合いが少しずつ異なる。その結果、照射面全体でスペクトルの合致度を一様にするのが困難である。したがって、スペクトル合致度が高い擬似太陽光照射装置を構成することができない。 Furthermore, it is assumed that the pseudo sunlight is formed using different types of light sources such as a xenon lamp and a halogen lamp so as to be advantageous in forming the pseudo sunlight having a high degree of spectrum matching. Even in this case, the degree of mixing of xenon light and halogen light is slightly different depending on the traveling direction of light from each lamp. As a result, it is difficult to make the degree of coincidence of the spectrum uniform over the entire irradiated surface. Therefore, it is not possible to configure a pseudo-sunlight irradiation device having a high spectrum matching degree.
　また、太陽光は光が平行光で、広がり無く進むという性質を持っており、擬似太陽光においても、同様に光の指向性を向上させるということが条件となる。 Also, sunlight has the property that light is parallel light and travels without spreading, and pseudo-sunlight is also required to improve the directivity of light.
　特許文献１においては、指向性制御部材３０４の効果により、指向性制御部材３０４からの出射光の指向性が上がることは期待できる。しかし、反射箱３０２は、上述のように形状が細長い箱形状となっていることから、開口部３０３の位置によって出射する光の特性が異なるので、指向性の低い光も混じることがある。さらに、開口部３０３と指向性制御部材３０４の間の空隙からの光も指向性が改善されないまま、出射することになる。このように、太陽電池の発電に寄与しない指向性の低い光も太陽電池に入射されることになり、基準太陽光に近い指向性の高い擬似太陽光を得ることができない。 In Patent Document 1, it can be expected that the directivity of the emitted light from the directivity control member 304 is increased by the effect of the directivity control member 304. However, since the reflection box 302 has a long and narrow box shape as described above, the characteristics of the emitted light differ depending on the position of the opening 303, so light with low directivity may be mixed. Further, the light from the gap between the opening 303 and the directivity control member 304 is emitted without improving the directivity. In this way, light with low directivity that does not contribute to power generation of the solar cell is also incident on the solar cell, and pseudo-sunlight with high directivity close to the reference sunlight cannot be obtained.
　このように、擬似太陽光照射装置においては、光学フィルタに入射する光の指向性を揃える必要がある上に、光学フィルタを透過した擬似太陽光の指向性も揃える必要がある。しかし、従来技術においてはそれらが十分に解決されていない。 Thus, in the simulated sunlight irradiation device, it is necessary to align the directivity of the light incident on the optical filter, and also to align the directivity of the simulated sunlight transmitted through the optical filter. However, in the prior art, they are not sufficiently solved.
　本発明は、上記の問題点に鑑みてなされたものであり、その目的は、光のスペクトルを高精度に制御可能であり、かつ光の指向性を大きく低下させること無く、指向性の揃った光を太陽電池等の被照射体に照射できる擬似太陽光照射装置を提供することにある。 The present invention has been made in view of the above-described problems, and the object thereof is to control the light spectrum with high accuracy and to align the directivity without greatly degrading the directivity of light. An object of the present invention is to provide a pseudo-sunlight irradiation device that can irradiate an irradiated object such as a solar cell.
　本発明に係る擬似太陽光照射装置は、前記光源からの出射光の指向性を高める部材と、前記光源からの出射光の透過率を制御するスペクトル調整部材と、前記スペクトル調整部材を透過した光が入射する導光部材と、前記導光部材に配置され、前記導光部材に入射した光を前記導光部材の照射面に取り出す光取り出し手段と、前記導光部材の出射面から射出する光を被照射方向に屈折させる光屈折部材を備えたことを特徴とする。 The pseudo-sunlight irradiation apparatus according to the present invention includes a member that increases the directivity of the emitted light from the light source, a spectrum adjusting member that controls the transmittance of the emitted light from the light source, and light that has passed through the spectrum adjusting member. Is incident on the light guide member, light extraction means that is disposed on the light guide member and takes out the light incident on the light guide member to the irradiation surface of the light guide member, and light emitted from the emission surface of the light guide member A light refracting member that refracts the light in the irradiation direction is provided.
　上記の構成によれば、光源からの出射光は、指向性を高める部材によって出射光の指向性が高められると共に、スペクトル調整部材によってスペクトル分布が太陽光に近づけられる。そして、このように指向性およびスペクトル分布が調整された光が、導光部材に入射する。導光材部に入射した光は、光取出し手段によって導光部材の照射面に取出される。さらに、導光部材からの出射光は、光屈折部材によって被照射方向に屈折される。したがって、光のスペクトルを高精度に制御され、かつ、光の指向性を大きく低下させること無く、指向性の揃った光を太陽電池等の被照射体に照射することができる。 According to the above configuration, the directivity of the emitted light from the light source is improved by the member that increases the directivity, and the spectrum distribution is made closer to sunlight by the spectrum adjusting member. Then, the light whose directivity and spectral distribution are adjusted in this way enters the light guide member. The light incident on the light guide member is taken out by the light extraction means to the irradiation surface of the light guide member. Furthermore, the emitted light from the light guide member is refracted in the irradiated direction by the light refraction member. Therefore, the light spectrum can be controlled with high accuracy, and light with uniform directivity can be irradiated to an irradiated object such as a solar cell without greatly reducing the directivity of light.
　本発明の擬似太陽光照射装置によれば、光のスペクトルを高精度に制御可能であり、かつ光の指向性を大きく低下させること無く、指向性の揃った光を太陽電池等の被照射体に照射できる擬似太陽光照射装置を得ることができる。 According to the simulated solar light irradiation device of the present invention, the light spectrum can be controlled with high accuracy, and light with uniform directivity can be irradiated without reducing the directivity of the light, such as a solar cell. Can be obtained.
　本発明の他の目的、特徴、および優れた点は、以下に示す記載によって十分分かるであろう。また、本発明の利点は、添付図面を参照した次の説明で明白になるであろう。 Other objects, features, and superior points of the present invention will be fully understood from the following description. The advantages of the present invention will become apparent from the following description with reference to the accompanying drawings.
第一の実施形態に係る擬似太陽光照射装置を示す概略構成図である。It is a schematic block diagram which shows the simulated sunlight irradiation apparatus which concerns on 1st embodiment. 上記擬似太陽光照射装置における光導入部の一部を示す概略図である。It is the schematic which shows a part of light introduction part in the said simulated sunlight irradiation apparatus. （ａ）は光屈折部材近傍を示す図、（ｂ）は光屈折部材における光屈折部を拡大した図である。(A) is a figure which shows the vicinity of a light refraction member, (b) is the figure which expanded the light refraction part in a light refraction member. 光屈折部材における光屈折部の向きを変えたときの光の指向性を示した図である。It is the figure which showed the directivity of light when changing the direction of the light refraction part in a photorefractive member. 距離保持部材を用いた擬似太陽光照射装置の概略構成図である。It is a schematic block diagram of the simulated sunlight irradiation apparatus using a distance holding member. スペーサを用いた擬似太陽光照射装置の概略構成図である。It is a schematic block diagram of the pseudo sunlight irradiation apparatus using a spacer. 上記擬似太陽光照射装置を上部から見た平面図である。It is the top view which looked at the said pseudo-sunlight irradiation apparatus from the upper part. 図７に示すユニットを連続して並べた擬似太陽光照射装置の概略図である。It is the schematic of the pseudo-sunlight irradiation apparatus which arranged the unit shown in FIG. 7 continuously. 第二の実施形態に係る擬似太陽光照射装置を示す概略構成図である。It is a schematic block diagram which shows the simulated sunlight irradiation apparatus which concerns on 2nd embodiment. 従来の光源装置の概略断面図である。It is a schematic sectional drawing of the conventional light source device.
　以下、本発明の実施の形態について説明する。なお、本発明の図面において、同一の参照符号は、同一部分または相当部分を表わすものとする。 Hereinafter, embodiments of the present invention will be described. In the drawings of the present invention, the same reference numerals represent the same or corresponding parts.
　＜第一の実施形態＞
　本発明の第一の実施形態について図１～図８を用いて以下に説明する。なお、各図に示す「ｘ」、「ｙ」、および「ｚ」は、それぞれ擬似太陽光照射装置のｘ軸、ｙ軸、およびｚ軸を個別に表す。 <First embodiment>
A first embodiment of the present invention will be described below with reference to FIGS. In addition, "x", "y", and "z" shown in each figure represent the x-axis, y-axis, and z-axis of the simulated solar light irradiation device, respectively.
　図１は、本実施形態における擬似太陽光照射装置１００の概略構成を示す図である。擬似太陽光照射装置１００は、光源１、集光素子２、テーパカプラ３、遮光部材４ａ、４ｂ、スペクトル調整部材５よりなる光導入部１０ａ、１０ｂと、導光部材６、光取り出し手段７、光屈折部材８、透明カバー９より構成される。擬似太陽光照射装置１００は、導光部材６の出射面から擬似太陽光を太陽電池等の被照射体に出射する。以下の説明では、導光部材６の光の出射面側を上面、出射面と逆側を下面とする。 FIG. 1 is a diagram showing a schematic configuration of a simulated solar light irradiation apparatus 100 in the present embodiment. The simulated sunlight irradiation device 100 includes a light introduction unit 10a, 10b including a light source 1, a light collecting element 2, a taper coupler 3, light shielding members 4a, 4b, and a spectrum adjusting member 5, a light guide member 6, a light extraction means 7, and light. It comprises a refractive member 8 and a transparent cover 9. The simulated sunlight irradiation device 100 emits simulated sunlight from an emission surface of the light guide member 6 to an irradiated object such as a solar cell. In the following description, the light emission surface side of the light guide member 6 is the upper surface, and the opposite side to the emission surface is the lower surface.
　光源１は、擬似太陽光を生成するために必要なスペクトル分布を有する光を照射するもので、例えば、キセノンランプ、あるいはハロゲンランプなどが用いられる。本実施形態では、図１の紙面に垂直方向に棒状である光源を用いているが、この棒形状に限らず、例えば点光源等でも構わない。光源１のテーパカプラ３への出射方向以外は、集光素子２に包囲されている。この集光素子２により、光源１から出射される光のうち、テーパカプラ３に向かわない光が集光素子２で反射し、テーパカプラ３に向かって出射する。集光素子２には、例えば、楕円ミラー、放物面ミラーなどが用いられ、光源１から出力された光を集めて出射させる。したがって光源１からの出力光が有効に利用される。 The light source 1 irradiates light having a spectral distribution necessary for generating simulated sunlight, and for example, a xenon lamp or a halogen lamp is used. In this embodiment, a light source that is rod-shaped in the direction perpendicular to the paper surface of FIG. 1 is used. However, the light source is not limited to this rod shape, and for example, a point light source may be used. The light collecting element 2 is surrounded by the light source 1 except for the direction of emission to the taper coupler 3. Of the light emitted from the light source 1, the light that does not go to the taper coupler 3 is reflected by the light collecting element 2 and emitted toward the taper coupler 3. For example, an elliptical mirror, a parabolic mirror, or the like is used as the condensing element 2, and the light output from the light source 1 is collected and emitted. Therefore, the output light from the light source 1 is used effectively.
　テーパカプラ３は、光源１とスペクトル調整部材５との間に設けられている。テーパカプラ３の端部は、光源１と近接して配置され、他の端部はスペクトル調整部材５に近接して配置されている。遮光部材４ａ、４ｂは、集光素子２に装着され、テーパカプラ３の入射面を包囲している。これにより、光源１からテーパカプラ３に向かって出射され、入射面に入射されなかった光が遮光部材４ａ、４ｂで反射し、再度テーパカプラ３に向かって出射する。したがって光源１からの出力光が有効に利用される。スペクトル調整部材５は、光源１から出射された光のスペクトルにおいて、特定の波長の透過率を調整することにより、太陽スペクトルとの近似性を高める光学素子であって、通常、エアマスフィルタと呼ばれる。スペクトル調整部材５は、テーパカプラ３の出射面に近接して設けられ、これにより、スペクトル調整された光が、導光部材６に入射する。 The taper coupler 3 is provided between the light source 1 and the spectrum adjustment member 5. The end of the taper coupler 3 is disposed close to the light source 1, and the other end is disposed close to the spectrum adjusting member 5. The light shielding members 4 a and 4 b are attached to the light collecting element 2 and surround the incident surface of the taper coupler 3. Thereby, the light emitted from the light source 1 toward the taper coupler 3 and not incident on the incident surface is reflected by the light shielding members 4 a and 4 b and is emitted toward the taper coupler 3 again. Therefore, the output light from the light source 1 is used effectively. The spectrum adjusting member 5 is an optical element that increases the closeness to the solar spectrum by adjusting the transmittance of a specific wavelength in the spectrum of the light emitted from the light source 1, and is usually called an air mass filter. The spectrum adjusting member 5 is provided in the vicinity of the exit surface of the taper coupler 3, so that the light whose spectrum has been adjusted enters the light guide member 6.
　導光部材６は、互いに対向して配置された光導入部１０ａ、１０ｂの間に設けられている。光導入部１０ａ、１０ｂから導光部材６の両側面に入射した擬似太陽光は、導光部材６の出射面から被照射物に照射される。光取り出し手段７は、導光部材６の下面に形成されている。光取り出し手段７は、光導入部１０ａ、１０ｂから出射された擬似太陽光を導光部材６の出射面に取り出す。具体的には、光導入部１０ａ、１０ｂから導光部材６に入射した光は、導光部材６の内部を伝播する。このとき、光取り出し手段７に当たった光は導光部材６の出射面へ出射される。これにより、より広い面積の出射面から擬似太陽光を照射することが可能となる。光取り出し手段７は、例えば、散乱体から形成することができ、導光部材６内部の擬似太陽光を散乱させて、出射面へ導くことができる。また、散乱体のパターンを変更すれば、擬似太陽光の照度ムラを調整することもできる。 The light guide member 6 is provided between the light introducing portions 10a and 10b arranged to face each other. The artificial sunlight that is incident on both side surfaces of the light guide member 6 from the light introducing portions 10 a and 10 b is irradiated to the irradiated object from the exit surface of the light guide member 6. The light extraction means 7 is formed on the lower surface of the light guide member 6. The light extraction means 7 extracts the pseudo sunlight emitted from the light introducing portions 10 a and 10 b to the emission surface of the light guide member 6. Specifically, the light incident on the light guide member 6 from the light introducing portions 10 a and 10 b propagates inside the light guide member 6. At this time, the light hitting the light extraction means 7 is emitted to the emission surface of the light guide member 6. Thereby, it becomes possible to irradiate pseudo sunlight from the emission surface of a larger area. The light extraction means 7 can be formed from a scatterer, for example, and can scatter the pseudo sunlight inside the light guide member 6 and guide it to the emission surface. Moreover, if the pattern of the scatterer is changed, the illuminance unevenness of the simulated sunlight can be adjusted.
　光屈折部材８は、光の屈折効果により、導光部材６の照射面に対して垂直な照射光の成分を多く作り出す。詳細は後述するが、光屈折部材８は、光取り出し手段７によって導光部材６から取り出させた光を、導光部材６の出射面に対して垂直な方向に屈折させるための部材である。透明カバー９は、導光部材６の出射面を覆い、導光部材６を保護する。 The light refracting member 8 produces a large amount of irradiation light component perpendicular to the irradiation surface of the light guide member 6 by the light refraction effect. Although details will be described later, the light refracting member 8 is a member for refracting the light extracted from the light guide member 6 by the light extraction means 7 in a direction perpendicular to the exit surface of the light guide member 6. The transparent cover 9 covers the light exit surface of the light guide member 6 and protects the light guide member 6.
　ここで擬似太陽光照射の原理について図１及び図２を用いて説明する。光源１から出力された光は集光素子２によって、放射指向性が制御され、図１におけるｘ軸方向への指向性を付与される。ここでは、光源１は、ｙ軸方向に伸びる棒状光源を用いているため、ｙ軸方向の光の指向性はあらかじめ付与されている。なお、図１において、紙面の奥行き方向をｙ軸とする。指向性の付与の原理は、集光素子２を例えば、楕円ミラーとしており、その性質として楕円面の焦点に光が集まり、その集光時の集光角の分だけの指向性が得られる。本実施形態では棒状光源を用いているが点状光源を用いる場合は、集光素子２の形状を適宜調整すればよい。さらに、遮光部材４ａ、４ｂでテーパカプラ３に入射しないで、導光部材６に入るような指向性の低い光を除去するとともに、光源１から出射され、テーパカプラ３に入射しなかった光を反射して集光素子２で再び反射してテーパカプラ３に入射させる。 Here, the principle of simulated sunlight irradiation will be described with reference to FIGS. Radiation directivity of the light output from the light source 1 is controlled by the condensing element 2, and directivity in the x-axis direction in FIG. Here, since the light source 1 uses a rod-shaped light source extending in the y-axis direction, the directivity of light in the y-axis direction is given in advance. In FIG. 1, the depth direction of the paper surface is the y-axis. The principle of imparting directivity is that the condensing element 2 is, for example, an elliptical mirror, and as a property, light gathers at the focal point of the elliptical surface, and directivity corresponding to the condensing angle at the time of condensing is obtained. In the present embodiment, a rod-shaped light source is used, but when a point light source is used, the shape of the light collecting element 2 may be adjusted as appropriate. Further, the light shielding members 4a and 4b remove light having low directivity that does not enter the taper coupler 3 without entering the taper coupler 3, and reflect light emitted from the light source 1 and not incident on the taper coupler 3. Then, it is reflected again by the condensing element 2 and is incident on the taper coupler 3.
　また、光源１から出力された光は、テーパカプラ３によっても放射指向性が制御され、テーパカプラ３を出た光は図１のｘｚ面、つまりｘ軸、ｚ軸双方の方向への指向性が付与される。 Further, the radiation directivity of the light output from the light source 1 is also controlled by the taper coupler 3, and the light emitted from the taper coupler 3 is given directivity in the xz plane of FIG. 1, that is, in both the x-axis and z-axis directions. Is done.
　図２は、擬似太陽光照射装置１００における光導入部１０の一部を示す図であり、光導入部１０を図１のＺ方向から見た上面図である。テーパカプラ３は、対向する一対の面がテーパ形状になっている。すなわち、テーパカプラ３の入射面から出射面に向かって、テーパカプラ３の断面積が徐々に増加する。このような構造によって、光源１から出力された光は、テーパカプラ３の側面で反射を繰り返し指向性が改善される。例えば、図２において、光源１から出射された光Ｌは、スネルの法則により、テーパカプラ３の臨界角内に集光されるとともに、全反射されることになる。そして、全反射された反射光は、対向面である外壁に到達し、再びここで全反射される。テーパカプラ３は、入射面から出射面に向かって次第に広がっているため、このような反射を繰り返すことによって、反射光は徐々に入射面（あるいは出射面）に鉛直な光へと変化していく。こうして、最終的には出射面から指向性の高い光、すなわち指向性の揃った光が出射される。なお、このとき、テーパカプラ３内に入射した光は全反射を繰り返すだけであることから、入射光のほとんどが出射光となり、高い出射効率を得ることができる。このようにして、テーパカプラ３の出射面に略垂直な方向に指向性が揃った光が、テーパカプラ３の出射面から出射される。 FIG. 2 is a diagram illustrating a part of the light introducing unit 10 in the simulated solar light irradiation apparatus 100, and is a top view of the light introducing unit 10 viewed from the Z direction in FIG. The taper coupler 3 has a pair of opposing surfaces that are tapered. That is, the cross-sectional area of the taper coupler 3 gradually increases from the incident surface of the taper coupler 3 toward the output surface. With such a structure, the light output from the light source 1 is repeatedly reflected on the side surface of the taper coupler 3 to improve the directivity. For example, in FIG. 2, the light L emitted from the light source 1 is condensed within the critical angle of the taper coupler 3 and totally reflected by Snell's law. Then, the totally reflected light reaches the outer wall which is the opposite surface, and is totally reflected again here. Since the taper coupler 3 gradually spreads from the incident surface toward the exit surface, the reflected light gradually changes to light perpendicular to the entrance surface (or the exit surface) by repeating such reflection. Thus, finally, light having high directivity, that is, light having uniform directivity is emitted from the emission surface. At this time, since the light incident on the taper coupler 3 only repeats total reflection, most of the incident light becomes emitted light, and high emission efficiency can be obtained. In this way, light having directivity aligned in a direction substantially perpendicular to the emission surface of the taper coupler 3 is emitted from the emission surface of the taper coupler 3.
　テーパカプラ３によって光の指向性をそろえる利点は、スペクトル調整部材５の構造と関係する。透過率制御を基準太陽光に合うように行う場合、スペクトル調整部材５は光学多層膜をガラス部材に形成して構成することが有効である。このため、スペクトル調整部材５への入射角がスペクトル調整部材５への垂直入射よりずれが大きいほど透過率特性も変化してしまう。つまり、スペクトル調整部材５に指向性の悪い光が入射すると、基準太陽光のスペクトル分布と乖離したスペクトル分布を有する擬似太陽光を生成してしまう。しかし、テーパカプラ３を用いて光の指向性を揃えれば、基準太陽光のスペクトル分布に近い擬似太陽光を生成することが可能である。 The advantage of aligning the directivity of light with the taper coupler 3 is related to the structure of the spectrum adjusting member 5. In the case where the transmittance control is performed so as to match the reference sunlight, it is effective to form the spectrum adjusting member 5 by forming an optical multilayer film on a glass member. For this reason, as the incident angle to the spectrum adjusting member 5 is larger than the vertical incidence to the spectrum adjusting member 5, the transmittance characteristic also changes. That is, when light with poor directivity is incident on the spectrum adjustment member 5, pseudo-sunlight having a spectrum distribution deviating from the spectrum distribution of the reference sunlight is generated. However, if the directivity of light is made uniform using the taper coupler 3, it is possible to generate pseudo sunlight that is close to the spectrum distribution of the reference sunlight.
　具体的には、テーパカプラ３から出射された光は、スペクトル調整部材５に対して、入射角範囲が±３０°以下になる。この光学多層膜は入射角０°、つまり多層膜に対して垂直で入射する場合に所定の透過特性が得られるように設計される。このため、入射光の多層膜への垂直方向の位相ずれが、１－ｃｏｓ３０°で約１４％である。従って、入射角成分が０°から３０°まで広がっていた場合でも、位相ずれ量は、０％から１４％の平均的な値になり、設計入射角０°入射の場合に対しての多層膜入射時の透過率の変動が小さくなる。 Specifically, the light emitted from the taper coupler 3 has an incident angle range of ± 30 ° or less with respect to the spectrum adjusting member 5. This optical multilayer film is designed so that a predetermined transmission characteristic can be obtained when the incident angle is 0 °, that is, when the optical multilayer film is incident perpendicularly to the multilayer film. For this reason, the vertical phase shift of incident light to the multilayer film is about 14% at 1-cos 30 °. Therefore, even when the incident angle component spreads from 0 ° to 30 °, the phase shift amount becomes an average value from 0% to 14%, and the multilayer film with respect to the case where the designed incident angle is incident at 0 ° Variation in transmittance at the time of incidence is reduced.
　このように、スペクトル調整部材５に対して、指向性の高い光が入射するので、スペクトルの制御性が高まり、より基準太陽光に近い擬似太陽光を形成することができる。その結果、スペクトル調整部材５を通過することで得られる光は、より設計に近く、つまり実際の太陽光に近くなる。その結果、擬似太陽光のスペクトル合致度は、基準太陽光からのずれが±５％以内のＪＩＳ　ＭＳ級の光にすることができる。 Thus, since highly directional light is incident on the spectrum adjusting member 5, the controllability of the spectrum is improved, and pseudo-sunlight closer to the reference sunlight can be formed. As a result, the light obtained by passing through the spectrum adjusting member 5 is closer to the design, that is, closer to actual sunlight. As a result, the spectrum coincidence of the pseudo-sunlight can be JIS MS-class light whose deviation from the reference sunlight is within ± 5%.
　スペクトル調整部材５では、光源１から出力された光のスペクトルの透過率を調整して、擬似太陽光と呼ばれる光を形成する。スペクトル調整部材５を透過し、導光部材６に入った光は、導光部材６を伝搬していく間に光取り出し手段７によって全反射条件が崩れて、まず、導光部材６から導光部材６の上方に放射される。ここで、導光部材６を石英などの高透過性ガラスで構成することで、導光部材６から放射される前に、スペクトル調整部材５でスペクトル調整された光の発光スペクトルは乱されない。 The spectrum adjusting member 5 adjusts the transmittance of the spectrum of the light output from the light source 1 to form light called pseudo-sunlight. The light transmitted through the spectrum adjusting member 5 and entering the light guide member 6 is guided from the light guide member 6 by breaking the total reflection condition by the light extraction means 7 while propagating through the light guide member 6. Radiated above the member 6. Here, when the light guide member 6 is made of highly transmissive glass such as quartz, the emission spectrum of the light whose spectrum is adjusted by the spectrum adjustment member 5 before being emitted from the light guide member 6 is not disturbed.
　導光部材６から放射された光は、光屈折部材８を透過する。光屈折部材８のはたらきは次のとおりである。導光部材６への入射指向性が低下した場合、導光部材６から出射する際の光の指向性が、発電性能が維持される太陽電池への入射角度範囲からはずれる光が多くなり、発電量が正確に測定できなくなる要素が増す。さらに、導光部材６から出射される光は、スペクトル合致度が高くなっていても、その光が照射される方向を正しく所定の角度に設定しなければならない。もし、光の指向性が悪くなれば、導光部材６からの出射光が太陽電池へ到達した際に、太陽電池に対して垂直方向からずれた光の成分比率が多くなることになり、この太陽電池への入射角がずれたことによる表面や界面の反射率の変化でも光量低下が発生してしまう。さらに、太陽電池への入射角がずれる際の反射特性の波長依存性により太陽電池へ入射する光のスペクトルも変化することになり、照射光のスペクトルの合致度も低下してしまう。この結果、高いスペクトル合致度を持つ擬似太陽光照射による太陽電池の発電評価も正しく行えない。そこで、光屈折部材８を備えることで、導光部材６から放射された光を、導光部材６の出射面に対してなるべく垂直な方向に屈折させ、導光部材６の出射面に対して垂直な照射光の成分を多く作り出し、基準太陽光の特性に近づけることが可能となる。 The light emitted from the light guide member 6 passes through the light refraction member 8. The function of the photorefractive member 8 is as follows. When the incident directivity to the light guide member 6 decreases, the directivity of the light when emitted from the light guide member 6 increases the amount of light deviating from the incident angle range to the solar cell in which the power generation performance is maintained. There are more factors that make it impossible to measure the quantity accurately. Furthermore, even if the light emitted from the light guide member 6 has a high degree of spectrum matching, the direction in which the light is irradiated must be set correctly at a predetermined angle. If the directivity of light deteriorates, when the light emitted from the light guide member 6 reaches the solar cell, the component ratio of light deviated from the vertical direction with respect to the solar cell increases. Even if the reflectance of the surface or interface is changed due to a shift in the incident angle to the solar cell, the light amount is reduced. Furthermore, the spectrum of the light incident on the solar cell also changes due to the wavelength dependence of the reflection characteristics when the incident angle to the solar cell shifts, and the degree of coincidence of the spectrum of the irradiated light also decreases. As a result, it is not possible to correctly evaluate the power generation of the solar cell by the pseudo-sunlight irradiation having a high degree of spectral coincidence. Therefore, by providing the light refracting member 8, the light radiated from the light guide member 6 is refracted in a direction as perpendicular as possible to the light exit surface of the light guide member 6, so that the light refraction member 8 is refracted. It is possible to create many components of vertical irradiation light and to approximate the characteristics of the reference sunlight.
　図３の（ａ）は、光屈折部材８近傍を示す図、図３の（ｂ）は、光屈折部材８の部分を拡大した図である。光屈折部材８は、図３の（ｂ）に示すような連続した光屈折部８１を備える。光屈折部８１は、例えば紫外線透過性のアクリル系樹脂などからなり、図３における紙面奥行き方向に伸びる断面略正三角形の帯形状であって、断面略正三角形の一頂点が導光部材６に対向するように配置されている。すなわち、光屈折部８１は、図面にて着色している部分である。このように、本実施形態では、光屈折部８１は、導光部材６の出射面に対して垂直な方向の断面が、正三角形または正三角形に近い形状となっている。 3A is a view showing the vicinity of the light refracting member 8, and FIG. 3B is an enlarged view of the portion of the light refracting member 8. The light refraction member 8 includes a continuous light refraction part 81 as shown in FIG. The light refracting portion 81 is made of, for example, an ultraviolet transparent acrylic resin and has a belt shape of a substantially equilateral triangle in section extending in the depth direction of the paper surface in FIG. It arrange | positions so that it may oppose. That is, the light refraction part 81 is a colored part in the drawing. As described above, in the present embodiment, the light refracting unit 81 has an equilateral triangle or a shape close to an equilateral triangle in a cross section perpendicular to the exit surface of the light guide member 6.
　ここで、光屈折部材８及び光屈折部８１の材料としては、屈折率１．５程度が得られるＰＣ系、ＰＥＴ系樹脂、さらにはガラス系材料が好適に用いられる。また、導光部材６としては、その屈折率が１．４５から１．５５のものを使用するのが好ましい。 Here, as the material of the light refracting member 8 and the light refracting portion 81, a PC-based resin, a PET-based resin, and a glass-based material that can obtain a refractive index of about 1.5 are preferably used. The light guide member 6 preferably has a refractive index of 1.45 to 1.55.
　また、光屈折部８１は、図３に示すように、光照射方向と反対の導光部材６側にあり、かつ一頂点が導光部材６に対向するように配置されていることが重要である。このような構成にすることで、出射される光は導光部材６に垂直な方向からさほど大きく広がらずに屈折させることができる。その原理は以下のとおりである。 Further, as shown in FIG. 3, it is important that the light refracting portion 81 is on the light guide member 6 side opposite to the light irradiation direction, and arranged so that one vertex faces the light guide member 6. is there. With such a configuration, the emitted light can be refracted without spreading so much from the direction perpendicular to the light guide member 6. The principle is as follows.
　導光部材６からの出射方向は、図３の（ａ）における光線２０ａ、２０ｂのように、導光部材６の表面に平行に近い方向に進む成分が多くなっている。このため、光屈折部８１での１回目の屈折方向が導光方向に近くなっており、その光が光屈折部８１の内部で全反射される。導光部材６に対して指向性が３０°以下で入射された場合、導光部材６の中を伝搬していく光は、導光部材６の中では表面に対して、屈折作用により、０°より大きく、およそ２０°以下の成分の光である。これらの光が全反射条件からずれて、導光部材６から出て行く場合の角度成分は、導光部材６の表面から０°～３０°離れる角度の範囲であり、その中心である１５°程度、導光部材６の表面を離れる方向を中心とした方向に、光が放射される。 In the emission direction from the light guide member 6, there are many components that proceed in a direction nearly parallel to the surface of the light guide member 6, like the light beams 20 a and 20 b in FIG. For this reason, the first refraction direction in the light refraction part 81 is close to the light guide direction, and the light is totally reflected inside the light refraction part 81. When the directivity is incident on the light guide member 6 at 30 ° or less, the light propagating through the light guide member 6 is 0 due to the refracting action on the surface of the light guide member 6. It is light of a component that is larger than ° and about 20 ° or smaller. The angle component in the case where these lights deviate from the total reflection condition and exit from the light guide member 6 is in the range of an angle of 0 ° to 30 ° away from the surface of the light guide member 6 and is 15 ° which is the center thereof. About, light is emitted in a direction centered on a direction away from the surface of the light guide member 6.
　この導光部材６に上記指向性が３０°以下で光が入射される場合、すなわち図３の（ｂ）における光線５０ｃに示すように０°から３０°までの角度で導光部材６の表面から離れた方向に向かう光が出射される場合、光屈折部８１の角度は、頂角６０°の三角形状であれば、光屈折部８１での屈折で、導光部材６に垂直な方向を中心とした屈折が可能になる。従って、図３の（ａ）に示すように導光部材６の両側から光を入射させる場合、導光部材６から垂直な方向に照射するのに有効な光屈折部８１の形状は頂角６０°の略正三角形形状となる。 When light is incident on the light guide member 6 with the directivity of 30 ° or less, that is, the surface of the light guide member 6 at an angle from 0 ° to 30 ° as shown by a light beam 50c in FIG. When light traveling in a direction away from the light is emitted, if the angle of the light refracting portion 81 is a triangular shape with an apex angle of 60 °, the light refracting portion 81 refracts the light perpendicular to the light guide member 6. Centered refraction is possible. Accordingly, when light is incident from both sides of the light guide member 6 as shown in FIG. 3A, the shape of the light refracting portion 81 effective for irradiating the light guide member 6 in the vertical direction is an apex angle 60. It becomes a substantially equilateral triangle shape of °.
　さらに、光屈折部８１は、導光部材６において、図３での紙面に垂直な方向に形成されている。これは、もともと図３のｘ方向の照射方向成分を持つ光の成分割合が多いため、光屈折部８１で導光部材６に略垂直な方向に屈折される光が大きく増加し、光屈折部材８の表面を通過する際の反射を大幅に低減し、光取り出し効率が高くなるためである。 Furthermore, the light refraction part 81 is formed in the light guide member 6 in a direction perpendicular to the paper surface in FIG. This is because the ratio of the light component having the irradiation direction component in the x direction in FIG. 3 is originally large, so that the light refracted in the direction substantially perpendicular to the light guide member 6 by the light refracting portion 81 greatly increases. This is because the reflection at the time of passing through the surface of 8 is greatly reduced and the light extraction efficiency is increased.
　図４は、光屈折部材８における光屈折部８１の配置を変えたときの光の指向性を示した図である。図４の（ａ）は、図３と同様に、導光部材６側に光屈折部８１を配置した場合、図４の（ｂ）は、比較例として、導光部材６と逆側に光屈折部８１を配置した場合の光の指向性を示している。図４の（ａ）、図４の（ｂ）での指向性は、導光部材６からの照射される光の出射角を図１のｘｚ面内での照射角度範囲とし、ここでは照射光の９０％以上が含まれる角度時範囲で規定して表している。 FIG. 4 is a diagram showing the directivity of light when the arrangement of the light refraction part 81 in the light refraction member 8 is changed. 4A is similar to FIG. 3, when the light refracting portion 81 is disposed on the light guide member 6 side, FIG. 4B is a comparative example in which light is transmitted to the opposite side of the light guide member 6. The directivity of light when the refracting portion 81 is arranged is shown. The directivity in FIGS. 4 (a) and 4 (b) is the irradiation angle range in the xz plane of FIG. 1, where the emission angle of the light emitted from the light guide member 6 is the irradiation light. It is specified and expressed in an angle time range including 90% or more.
　ここでは、導光部材６は厚さ１０ｍｍ、光取り出し手段７は、印刷用シリカビーズ配合インクで形成された反射体を用いており、導光部材６の端面から光を導入する。導入される光はテーパカプラ３で０°から３０°までに指向性が制御された光がスペクトル調整部材５を通過したものである。さらに、本実施形態の擬似太陽光照射装置における指向性は、光屈折部材８及び光屈折部８１の材料の屈折率が１．５、光屈折部８１単体の形状が一辺２００μｍの正三角形状（頂角６０°）である場合に得られる。光屈折部材８１の材料としては、アクリル系樹脂、または、ＰＥＴ系樹脂、さらにはガラス系材料などが好適に用いられる。 Here, the light guide member 6 has a thickness of 10 mm, and the light extraction means 7 uses a reflector formed of silica bead-mixed ink for printing, and introduces light from the end face of the light guide member 6. The light to be introduced is light whose directivity is controlled from 0 ° to 30 ° by the taper coupler 3 through the spectrum adjusting member 5. Furthermore, the directivity in the pseudo-sunlight irradiation device of the present embodiment is an equilateral triangular shape in which the refractive index of the material of the light refracting member 8 and the light refracting portion 81 is 1.5, and the shape of the light refracting portion 81 alone is 200 μm on a side. It is obtained when the apex angle is 60 °. As the material of the photorefractive member 81, an acrylic resin, a PET resin, or a glass material is preferably used.
　図４の（ａ）のように光屈折部８１を導光部材６側に配置して、光を照射した場合、図４の（ｂ）の場合よりも光が発散しない。このため、太陽電池への入射角度が小さくなり、太陽電池の発電領域に到達するまでに反射される光が少なく、擬似太陽光照射時の発電量低下を防ぐことができる。 When the light refracting portion 81 is arranged on the light guide member 6 side and irradiated with light as shown in FIG. 4A, light is not diffused as compared with the case of FIG. For this reason, the incident angle to the solar cell is reduced, and less light is reflected before reaching the power generation region of the solar cell, so that it is possible to prevent a decrease in the amount of power generation during irradiation with simulated sunlight.
　光屈折部８１で光をさらに導光部材６に対して垂直な方向に屈折させる。図３で示すように、本実施例では、光は大きく見れば、矢印で示す光線３０ａ、３０ｂのように、導光部材６の一方の端面から他方の端面に向かう方向に進んでいく。本実施例では、導光部材６の両側に同じ光学系（光導入部１０ａ、１０ｂ）を配置しているため、照射光は、照射全面にわたり、類似した指向性を持ったバランスが良い形で照射できる。ただし、光源１は、導光部材６の両側から入射する配置に限らず、片側に光源１が配置される構造でも指向性の揃った擬似太陽光を照射するという性能は維持できる。 The light refracting unit 81 further refracts light in a direction perpendicular to the light guide member 6. As shown in FIG. 3, in this embodiment, the light travels in a direction from one end face of the light guide member 6 toward the other end face as light rays 30 a and 30 b indicated by arrows when viewed largely. In the present embodiment, since the same optical system ( light introducing portions 10a and 10b) is arranged on both sides of the light guide member 6, the irradiated light has a good balance with similar directivity over the entire irradiation surface. Can be irradiated. However, the light source 1 is not limited to the arrangement in which the light guide member 6 is incident from both sides, and the performance of irradiating pseudo-sunlight with uniform directivity can be maintained even in the structure in which the light source 1 is arranged on one side.
　このように、光屈折部材８と空気界面での光屈折効果のみで光を屈折させるので、導光部材６を伝搬し、導光部材６から出てくるまでの間の発光スペクトルは変化しない。さらに光屈折部材８があることで、仮に光屈折部材８での屈折の際に、屈折方向が波長によってずれても、光が導光部材６からの出射する時は、波長域全体で見れば、光の屈折方向が導光部材６に垂直な角度付近でわずかにずれるだけになる。このため、光の屈折方向の中心角度が導光部材６に垂直な角度である傾向は維持され、被照射体に対しても、垂直な角度を中心とした角度で入射する照射光が形成される。 In this way, since light is refracted only by the light refraction effect at the light refracting member 8 and the air interface, the light emission spectrum from when propagating through the light guiding member 6 until coming out of the light guiding member 6 does not change. Further, since the light refracting member 8 is provided, even if the refraction direction is shifted depending on the wavelength when the light is refracted by the light refracting member 8, when light is emitted from the light guide member 6, if it is viewed in the entire wavelength range. The light refraction direction is slightly shifted near an angle perpendicular to the light guide member 6. For this reason, the tendency that the central angle of the light refraction direction is an angle perpendicular to the light guide member 6 is maintained, and irradiation light incident at an angle centered on the vertical angle is also formed on the irradiated object. The
　また、指向性の高い光を導光部材６に入射させているため、太陽電池に対して、光取り出し手段７によって、導光部材６から光が照射される際にも、光取り出し手段７で指向性が乱れても、指向性の低下は＋１５°程度である。従って、指向性の低下が小さく、スペクトル合致度が高く、指向性の高い、すなわち指向性の揃った光が太陽電池に照射されることになる。 Further, since light with high directivity is made incident on the light guide member 6, the light extraction means 7 also emits light from the light guide member 6 to the solar cell by the light extraction means 7. Even if the directivity is disturbed, the decrease in directivity is about + 15 °. Accordingly, the solar cell is irradiated with light with a small decrease in directivity, a high degree of spectrum matching, and high directivity, that is, with uniform directivity.
　さらに、図５に示すような、擬似太陽光照射装置１００との太陽電池９０との距離を離すための距離保持部材４０ａ、４０ｂを設ける構造にしてもよい。この距離保持部材４０ａ、４０ｂがあることで、光取り出し手段７において発生する指向性が非常に低い光の成分を除去し、指向性が高い光の太陽電池９０への入射比率を相対的に高めることができる。 Further, as shown in FIG. 5, a structure may be provided in which distance holding members 40a and 40b for separating the distance from the solar cell 90 to the simulated solar light irradiation device 100 are provided. The presence of the distance holding members 40a and 40b removes light components with very low directivity generated in the light extraction means 7, and relatively increases the incidence ratio of light with high directivity to the solar cell 90. be able to.
　光屈折部材８を透過した光は、透明カバー９を透過して、太陽電池９０に照射される。透明カバー９の有無は、照射時の指向性に関係はないが、透明カバー９があることで、この透明カバー９と導光部材６の間に光屈折部材８を挟みこんで、光屈折部材８が反らないようにすることができる。光屈折部材８が反らないことで、より正確な指向性をもった擬似太陽光が被測定物に照射されることが可能となる。 The light that has passed through the photorefractive member 8 passes through the transparent cover 9 and is applied to the solar cell 90. The presence or absence of the transparent cover 9 is not related to the directivity at the time of irradiation, but the presence of the transparent cover 9 sandwiches the light refracting member 8 between the transparent cover 9 and the light guide member 6 so that the light refracting member 8 can be prevented from warping. Since the photorefractive member 8 does not warp, it is possible to irradiate the object to be measured with pseudo sunlight having more accurate directivity.
　なお、図６のように、光屈折部材８と透明カバー９の間にスペーサ５０ａ、５０ｂを配置してもよい。スペーサ５０ａ、５０ｂを通じた透明カバー９の自重で、光屈折部材８の反りを抑え、光屈折部材８と導光部材６との距離を一定に制御して、導光部材６と光屈折部材８との距離が不均一なことによる光の屈折のばらつきを抑えることができる。スペーサ５０ａ、５０ｂと透明カバー９は、その間に一定の高さの空間を形成する。ここで、光屈折部材８の厚さをスペーサ５０ａ、５０ｂの厚さに合わせておけば、光屈折部材８は、反ることもなく、結果として光屈折部材８と導光部材６との距離を一定に保つことができる。これにより、光照射方向の制御精度を上げることができ、より多くの光を確実に屈折させ、擬似太陽光を太陽電池に照射することができる。 As shown in FIG. 6, spacers 50a and 50b may be disposed between the light refraction member 8 and the transparent cover 9. The light weight of the transparent cover 9 through the spacers 50a and 50b suppresses the warp of the light refracting member 8, controls the distance between the light refracting member 8 and the light guiding member 6 to be constant, and the light guiding member 6 and the light refracting member 8 Variation in the refraction of light due to the non-uniformity of the distance can be suppressed. The spacers 50a and 50b and the transparent cover 9 form a space having a certain height therebetween. Here, if the thickness of the light refracting member 8 is adjusted to the thickness of the spacers 50a and 50b, the light refracting member 8 does not warp, and as a result, the distance between the light refracting member 8 and the light guide member 6 is increased. Can be kept constant. Thereby, the control precision of a light irradiation direction can be raised, more light can be refracted | cured reliably, and a pseudo-sunlight can be irradiated to a solar cell.
　また、スペーサ５０ａ、５０ｂの部分が大きくても使用可能なように、スペーサ５０ａ、５０ｂは透明であることが好ましい。スペーサ５０ａ、５０ｂが透明であることにより照射範囲が狭くなることを防ぐことができる。さらに、その透明のスペーサ５０ａ、５０ｂの表面（すなわち導光部材６の側と照射面の側との両面）に反射光を低減する多層膜コート等の減反射コーティングがなされたものが好ましい。または、スペーサ５０ａ、５０ｂの表面に、光吸収性の部材を配置する場合には、照射面全体に対して少ない面積比で配置するのが好ましい。 Also, it is preferable that the spacers 50a and 50b are transparent so that the spacers 50a and 50b can be used even if they are large. Since the spacers 50a and 50b are transparent, it is possible to prevent the irradiation range from becoming narrow. Further, it is preferable that the surface of the transparent spacers 50a and 50b (that is, both the light guide member 6 side and the irradiation surface side) is provided with a antireflection coating such as a multilayer coating that reduces reflected light. Or when arrange | positioning a light absorptive member on the surface of spacer 50a, 50b, it is preferable to arrange | position with a small area ratio with respect to the whole irradiation surface.
　図７は、擬似太陽光照射装置１００を上部から見た平面図である。ここでは、光導入部１０において、光源１は２つであり、説明のために透明カバー９を省略している。また、図７において、光導入部１０、導光部材６、光取り出し手段７（図示せず）、光屈折部材８、スペーサ５０ａ、５０ｂ、５０ｃ、５０ｄを含む構成をユニット６０ａとし、他方をユニット６０ｂとする。ユニット６０ａとユニット６０ｂは、向きが異なる以外はまったく同じ構成である。このように対向して２つのユニット６０ａ、６０ｂが配置された場合、光屈折部材８は、それぞれのユニットにおける導光部材６をまたぐように配置されるのが好ましい。また、図７において、スペーサ５０ａ、５０ｂ、５０ｃ、５０ｄは、ユニット６０ａ、６０ｂのそれぞれの導光部材６の四隅を押さえる位置に配置するとよい。これにより、必要最小限のスペーサで光屈折部材８と導光部材６との距離を精度良く保持できる。 FIG. 7 is a plan view of the simulated sunlight irradiation device 100 as viewed from above. Here, in the light introduction part 10, the light source 1 is two, and the transparent cover 9 is abbreviate | omitted for description. Further, in FIG. 7, the unit 60 a is configured to include the light introduction unit 10, the light guide member 6, the light extraction means 7 (not shown), the light refraction member 8, the spacers 50 a, 50 b, 50 c, and 50 d, and the other unit. 60b. The unit 60a and the unit 60b have exactly the same configuration except that their directions are different. When the two units 60a and 60b are arranged so as to face each other as described above, the light refraction member 8 is preferably arranged so as to straddle the light guide member 6 in each unit. In FIG. 7, the spacers 50a, 50b, 50c, and 50d are preferably arranged at positions that hold the four corners of the light guide members 6 of the units 60a and 60b. As a result, the distance between the light refraction member 8 and the light guide member 6 can be accurately maintained with the minimum necessary spacers.
　図８は、図７に示すユニット６０ａ、６０ｂを導光部材６が隣り合うように連続して並べた擬似太陽光照射装置である。この場合も、上記同様、光屈折部材８は、それぞれのユニットにおける導光部材６をまたぐように配置するのが最も好ましい。このように擬似太陽光照射装置が大型化した場合でも、光屈折部材８は、導光部材６をまたぐことで、導光部材６の継ぎ目などからの照射光の照度ずれの影響を低減することができる。 FIG. 8 shows a simulated sunlight irradiation device in which the units 60a and 60b shown in FIG. 7 are continuously arranged so that the light guide members 6 are adjacent to each other. Also in this case, as described above, it is most preferable that the light refraction member 8 is disposed so as to straddle the light guide member 6 in each unit. Thus, even when the pseudo-sunlight irradiation device is enlarged, the light refraction member 8 straddles the light guide member 6 to reduce the influence of the illuminance deviation of the irradiation light from the joint of the light guide member 6 or the like. Can do.
　＜第二の実施形態＞
　次に、第二の実施形態について説明する。本実施の形態では、２種類の光源と、波長選択ミラーよりなる光導入部１０ｃ、１０ｄを用いた以外は、第一の実施形態と構成は同じである。 <Second Embodiment>
Next, a second embodiment will be described. In the present embodiment, the configuration is the same as that of the first embodiment except that two types of light sources and light introducing portions 10c and 10d made of wavelength selection mirrors are used.
　図９は、第二の実施形態における擬似太陽光照射装置２００の概略構成を示す図である。擬似太陽光照射装置２００は、光導入部１０ｃ、１０ｄと、導光部材６、光取り出し手段７、光屈折部材８、透明カバー９より構成される。 FIG. 9 is a diagram showing a schematic configuration of the simulated solar light irradiation apparatus 200 in the second embodiment. The simulated sunlight irradiation device 200 includes light introducing portions 10 c and 10 d, a light guide member 6, a light extraction means 7, a light refraction member 8, and a transparent cover 9.
　光導入部１０ｃ、１０ｄは、導光部材６の両側面に配置されている。光導入部１０ｄは、光導入部１０ｃの構成と同一である。具体的には、光導入部１０ｃは、第一の光源としてのキセノン光源１ａ、集光素子２ａ、２ｂ、テーパカプラ３ａ、３ｂ、遮光部材４ｃ、４ｄ、４ｅ、４ｆ、スペクトル調整部材５ａ、５ｂ、波長選択ミラー１１、第二の光源としてのハロゲン光源１ｂから構成される。 The light introducing portions 10 c and 10 d are disposed on both side surfaces of the light guide member 6. The light introduction part 10d has the same configuration as the light introduction part 10c. Specifically, the light introducing unit 10c includes a xenon light source 1a as a first light source, condensing elements 2a and 2b, taper couplers 3a and 3b, light shielding members 4c, 4d, 4e, and 4f, spectrum adjusting members 5a and 5b, It comprises a wavelength selection mirror 11 and a halogen light source 1b as a second light source.
　光導入部１０ｃは、キセノン光源１ａ及びハロゲン光源１ｂからそれぞれ出射された光を波長選択ミラー１１で混合することにより擬似太陽光を生成し、擬似太陽光を導光部材６の端面に照射する。 The light introducing unit 10 c generates simulated sunlight by mixing the light emitted from the xenon light source 1 a and the halogen light source 1 b with the wavelength selection mirror 11, and irradiates the end surface of the light guide member 6 with the simulated sunlight.
　具体的には、キセノン光源１ａからの光を、波長選択ミラー１１で、その短波長側の光を反射させるとともに、長波長側の光を透過させて導光部材６に導く。その一方でハロゲン光源１ｂからの光を波長選択ミラー１１で、その長波長側の光を反射させるとともに、その短波長側の光を透過させて導光部材６に導いている。このような構成にすることで、スペクトル制御が難しいキセノン光源１ａの長波長側にある輝線成分を低減することができるため、スペクトル合致度を低下させる原因をなくすことにもつながる。 Specifically, the light from the xenon light source 1 a is guided by the wavelength selection mirror 11 to the light guide member 6 while reflecting the light on the short wavelength side and transmitting the light on the long wavelength side. On the other hand, the light from the halogen light source 1 b is reflected by the wavelength selection mirror 11, the light on the long wavelength side is reflected, and the light on the short wavelength side is transmitted and guided to the light guide member 6. By adopting such a configuration, it is possible to reduce the bright line component on the long wavelength side of the xenon light source 1a, which is difficult to control the spectrum, so that it is possible to eliminate the cause of lowering the degree of spectral matching.
　また、キセノン光源１ａを出た光は、指向性を付与するための導光部材であるテーパカプラ３ａを出た後、スペクトル調整部材５ａに入射する。また、ハロゲン光源１ｂを出た光は、テーパカプラ３ｂを出た後、スペクトル調整部材５ｂに入射する。そして、それぞれの光が波長選択ミラー１１において混合され、一つの擬似太陽光が導光部材６に入射する前に形成される。この際には、キセノン光源１ａから擬似太陽光の短波長側の成分が形成され、ハロゲン光源１ｂから擬似太陽光の長波長側の成分が形成され、スペクトル合致度が高くなるよう、透過率調整による発光スペクトルの調整がなされる。従って、結果として高精度の擬似太陽光を形成することができる。なお、スペクトル調整部材５ａ、５ｂは、例えば、スペクトル調整部材を２枚に分けて、その透過特性の積が１枚分の透過特性に等価になるようにするなどして、２枚以上の構成にすることもできる。このようにすることで、スペクトル合致度をより高めることができる。 The light exiting the xenon light source 1a exits the taper coupler 3a, which is a light guide member for imparting directivity, and then enters the spectrum adjusting member 5a. The light emitted from the halogen light source 1b exits the taper coupler 3b and then enters the spectrum adjusting member 5b. Then, the respective lights are mixed in the wavelength selection mirror 11 and formed before one pseudo sunlight is incident on the light guide member 6. At this time, the short wavelength component of the pseudo sunlight is formed from the xenon light source 1a, and the long wavelength component of the pseudo sunlight is formed from the halogen light source 1b. The emission spectrum is adjusted by. Therefore, highly accurate simulated sunlight can be formed as a result. The spectrum adjusting members 5a and 5b have two or more configurations, for example, by dividing the spectrum adjusting member into two sheets so that the product of the transmission characteristics is equivalent to the transmission characteristics for one sheet. It can also be. By doing in this way, a degree of spectrum agreement can be raised more.
　導光部材６に導入された光は光取り出し手段７によって、導光部材６の外部に光が取り出され、導光部材６の上方に擬似太陽光が照射される。ここで、第一の光源を用いた第一の光源系（光導入部１０ｃ）と第二の光源を用いた第二の光学系（光導入部１０ｄ）とがあることで、よりスペクトル合致度を高くし、擬似太陽光に近づけることができる。本実施形態では、第一の光源としてキセノン光源、第二の光源としてハロゲン光源を用いたがこれに限られるものではなく、擬似太陽光を形成するために適した光源であれば用いることができる。 The light introduced into the light guide member 6 is extracted to the outside of the light guide member 6 by the light extraction means 7, and pseudo sunlight is irradiated above the light guide member 6. Here, since there is a first light source system (light introduction unit 10c) using the first light source and a second optical system (light introduction unit 10d) using the second light source, the degree of spectrum matching is further increased. Can be made higher and can be close to simulated sunlight. In this embodiment, a xenon light source is used as the first light source and a halogen light source is used as the second light source. However, the present invention is not limited to this, and any light source suitable for forming simulated sunlight can be used. .
　本発明では、スペクトルを高精度に制御するために指向性の高い光でスペクトル調整を行い、導光部材６に光を入射して、光取り出し手段７で光を導光部材６から出した後も、光屈折部８１の向きが、光照射方向と反対の導光部材側にある光屈折部材８を配置することで、その指向性を大きく低下させることなく、スペクトル調整された光を太陽電池に照射することができる。 In the present invention, the spectrum is adjusted with light having high directivity in order to control the spectrum with high accuracy, the light is incident on the light guide member 6, and the light is extracted from the light guide member 6 by the light extraction means 7. However, by arranging the light refracting member 8 whose light refracting portion 81 is on the light guide member side opposite to the light irradiation direction, the spectrally adjusted light can be transmitted without greatly reducing the directivity thereof. Can be irradiated.
　以上のように、本発明の擬似太陽光照射装置では、前記光屈折部材は、光を屈折させるプリズム状の光屈折部を備え、前記光屈折部は、光照射方向と反対の導光部材側にあることを特徴としてもよい。また、本発明の擬似太陽光照射装置では、前記光屈折部の断面は略正三角形であることを特徴としてもよい。また、本発明の擬似太陽光照射装置では、前記光屈折部は互いに隣接し、連続して配置されていることを特徴としてもよい。 As described above, in the pseudo-sunlight irradiation device of the present invention, the light refraction member includes a prismatic light refraction part that refracts light, and the light refraction part is on the light guide member side opposite to the light irradiation direction. It may be characterized by that. In the pseudo-sunlight irradiation apparatus of the present invention, the cross section of the light refraction part may be a substantially equilateral triangle. In the simulated solar light irradiation device of the present invention, the light refraction portions may be adjacent to each other and continuously arranged.
　また、本発明の擬似太陽光照射装置では、前記光屈折部の光の第１回目の屈折方向は、前記導光部材の導光方向であることを特徴としてもよい。また、本発明の擬似太陽光照射装置では、前記光屈折部材は、透明カバーと前記導光部材との間に配置されていることを特徴としてもよい。 In the simulated sunlight irradiation device of the present invention, the first refraction direction of the light of the light refraction unit may be the light guide direction of the light guide member. In the simulated sunlight irradiation device of the present invention, the light refraction member may be disposed between a transparent cover and the light guide member.
　また、本発明の擬似太陽光照射装置では、前記光屈折部材と前記透明カバーの間に距離を保持するスペーサが配置されたことを特徴してもよい。また、本発明の擬似太陽光照射装置では、前記スペーサは、減反射機能を有することを特徴としてもよい。 Further, in the simulated sunlight irradiation device of the present invention, a spacer for maintaining a distance may be disposed between the light refraction member and the transparent cover. In the simulated sunlight irradiation device of the present invention, the spacer may have a function of reducing reflection.
　また、本発明の擬似太陽光照射装置では、前記導光部材が複数配置され、かつ前記光屈折部材が前記複数の導光部材の少なくとも２つ以上の境界を覆うように配置されることを特徴としてもよい。また、本発明の擬似太陽光照射装置では、前記光屈折部材と、被照射物との間を保持する距離保持部材を備えたことを特徴としてもよい。 In the simulated sunlight irradiation device of the present invention, a plurality of the light guide members are disposed, and the light refraction members are disposed so as to cover at least two boundaries of the plurality of light guide members. It is good. Moreover, the simulated solar light irradiation device of the present invention may include a distance holding member that holds the light refraction member and the object to be irradiated.
　今回開示された実施の形態および実施例はすべての点で例示であって、制限的なものではないと考えられるべきである。本発明の範囲は上記した説明ではなくて、特許請求の範囲によって示され、特許請求の範囲と均等の意味、および範囲内でのすべての変更が含まれることが意図される。 It should be considered that the embodiments and examples disclosed this time are examples in all respects and are not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
　１、１ａ、１ｂ　光源
　２、２ａ、２ｂ、　集光素子
　３、３ａ、３ｂ　テーパカプラ
　４ａ、４ｂ、４ｃ、４ｄ、４ｅ、４ｆ　遮光部材
　５、５ａ、５ｂ　スペクトル調整部材
　６　導光部材
　７　光取り出し手段
　８　光屈折部材
　９　透明カバー
　１０、１０ａ、１０ｂ、１０ｃ、１０ｄ　光導入部
　１１　波長選択ミラー
　４０ａ、４０ｂ　距離保持部材
　５０ａ、５０ｂ、５０ｃ、５０ｄ　スペーサ
　６０ａ、６０ｂ　ユニット
　８１　光屈折部
　９０　太陽電池
　１００、２００　擬似太陽光照射装置 DESCRIPTION OF SYMBOLS 1, 1a, 1b Light source 2, 2a, 2b, Condensing element 3, 3a, 3b Taper coupler 4a, 4b, 4c, 4d, 4e, 4f Light-shielding member 5, 5a, 5b Spectrum adjustment member 6 Light guide member 7 Light extraction means 8 Light refraction member 9 Transparent cover 10, 10a, 10b, 10c, 10d Light introducing part 11 Wavelength selection mirror 40a, 40b Distance holding member 50a, 50b, 50c, 50d Spacer 60a, 60b Unit 81 Light refraction part 90 Solar cell 100, 200 Simulated sunlight irradiation device

Claims (10)

  1. 　光源と、
    　前記光源からの出射光の指向性を高める部材と、
    　前記光源からの出射光の透過率を制御するスペクトル調整部材と、
    　前記スペクトル調整部材を透過した光が入射する導光部材と、
    　前記導光部材に配置され、前記導光部材に入射した光を前記導光部材の照射面に取り出す光取り出し手段と、
    　前記導光部材の出射面から射出する光を被照射方向に屈折させる光屈折部材を備えたことを特徴とする擬似太陽光照射装置。     A light source;
    A member for increasing the directivity of the emitted light from the light source;
    A spectrum adjusting member for controlling the transmittance of light emitted from the light source;
    A light guide member into which light transmitted through the spectrum adjusting member is incident;
    A light extraction means that is disposed on the light guide member and extracts light incident on the light guide member to an irradiation surface of the light guide member;
    A pseudo-sunlight irradiation apparatus comprising a light refraction member that refracts light emitted from an emission surface of the light guide member in an irradiation direction.
  2. 　前記光屈折部材は、光を屈折させるプリズム状の光屈折部を備え、
    　前記光屈折部は、光照射方向と反対の導光部材側にあることを特徴とする請求項１記載の擬似太陽光照射装置。     The light refracting member includes a prismatic light refracting portion that refracts light,
    The pseudo-sunlight irradiation device according to claim 1, wherein the light refracting portion is on a light guide member side opposite to a light irradiation direction.
  3. 　前記光屈折部の断面は略正三角形であることを特徴とする請求項２記載の擬似太陽光照射装置。 The pseudo-sunlight irradiation device according to claim 2, wherein a cross section of the light refraction part is a substantially equilateral triangle.
  4. 　前記光屈折部は互いに隣接し、連続して配置されていることを特徴とする請求項２または３記載の擬似太陽光照射装置。 The pseudo-sunlight irradiation device according to claim 2 or 3, wherein the light refraction portions are adjacent to each other and arranged continuously.
  5. 　前記光屈折部の光の第１回目の屈折方向は、前記導光部材の導光方向であることを特徴とする請求項２ないし４のいずれか１項に記載の擬似太陽光照射装置。 The pseudo-sunlight irradiation device according to any one of claims 2 to 4, wherein a first refraction direction of light of the light refraction unit is a light guide direction of the light guide member.
  6. 　前記導光部材の出射面を覆う透明カバーをさらに備え、
    　前記光屈折部材は、前記透明カバーと前記導光部材との間に配置されていることを特徴とする請求項２ないし５のいずれかに記載の擬似太陽光照射装置。     Further comprising a transparent cover covering the exit surface of the light guide member;
    6. The simulated solar light irradiation device according to claim 2, wherein the light refraction member is disposed between the transparent cover and the light guide member.
  7. 　前記光屈折部材と前記透明カバーの間に距離を保持するスペーサが配置されたことを特
    徴とする請求項６記載の擬似太陽光照射装置。     The pseudo-sunlight irradiation apparatus according to claim 6, wherein a spacer for maintaining a distance is disposed between the light refraction member and the transparent cover.
  8. 　前記スペーサは、減反射機能を有することを特徴とする請求項７記載の擬似太陽光照射装置。 The pseudo-sunlight irradiation device according to claim 7, wherein the spacer has a function of reducing reflection.
  9. 　前記導光部材が複数配置され、かつ前記光屈折部材が前記複数の導光部材の少なくとも２つ以上の境界を覆うように配置されることを特徴とする請求項１ないし８のいずれか１項に記載の擬似太陽光照射装置。 The plurality of light guide members are disposed, and the light refraction member is disposed so as to cover at least two boundaries of the plurality of light guide members. The simulated solar light irradiation device described in 1.
  10. 　前記光屈折部材と、被照射物との間を保持する距離保持部材を備えたことを特徴とする請求項１ないし９のいずれか１項に記載の擬似太陽光照射装置。 The pseudo-sunlight irradiation device according to any one of claims 1 to 9, further comprising a distance holding member that holds the light refraction member and an object to be irradiated.
PCT/JP2012/066113 2011-09-13 2012-06-25 Artificial-sunlight projection device WO2013038769A1 (en)

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WO2006117956A1 (en) * 2005-04-28 2006-11-09 Sharp Kabushiki Kaisha Liquid crystal display device
JP2008123951A (en) * 2006-11-15 2008-05-29 National Institute Of Advanced Industrial & Technology Solar simulator
WO2011089744A1 (en) * 2010-01-25 2011-07-28 シャープ株式会社 Simulated solar light irradiation device and simulated solar light irradiation method

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Publication number Priority date Publication date Assignee Title
WO2006117956A1 (en) * 2005-04-28 2006-11-09 Sharp Kabushiki Kaisha Liquid crystal display device
JP2008123951A (en) * 2006-11-15 2008-05-29 National Institute Of Advanced Industrial & Technology Solar simulator
WO2011089744A1 (en) * 2010-01-25 2011-07-28 シャープ株式会社 Simulated solar light irradiation device and simulated solar light irradiation method

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