Solar cell module

Abstract

To provide a solar cell module with improved design.SOLUTION: A picture printing layer 9 of a printed matter includes a first color pattern 10 constituted of a first color dot 11 and a second color pattern 20 constituted of a second color dot 21. The first color dot 11 includes first color pigment chips 13, and the second color dot 21 includes second color pigment chips 23. The first color pigment chips 13 are first interference pigments of a plurality of color that generate first interference light different from each other, and a plurality of the second color pigment chips 23 are second interference pigments that generate second interference light of single color different from mixed color exhibited by the first interference pigments of the plurality of color. At least one of the interference pigments includes a small particle size grade interference pigment including a particle size range of 5 μm to 25 μm and a large particle size grade interference pigment including the particle size range of 25 μm to 40 μm. In this solar cell module, the plurality of first interference light and the second interference light are additively mixed.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a solar cell module.

Background Art

[0002] Aiming at realizing a carbon-neutral and decarbonized society by 2050, the spread of ZEB (Net Zero Energy Building) that can greatly reduce the energy consumption in buildings is required. ZEB refers to a building that aims to achieve a zero balance of annual primary energy consumed in the building while realizing a comfortable indoor environment. Since people are active in buildings, it is impossible to completely zero the energy consumption. However, it is possible to net-zero the energy consumption by reducing the energy used through energy conservation and generating the energy equivalent to the energy used through energy generation.

[0003] As an energy generation method that does not use fossil fuels, for example, there are solar power generation, wind power generation, biomass power generation, etc. Considering the installation location and cost, solar power generation is suitable as an energy generation method in buildings. The rooftops of buildings are occupied by outdoor units such as air conditioners. In order to obtain the power generation amount, it is necessary to install solar cell modules on the wall surfaces other than the rooftops.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] When a solar cell module is installed on a wall surface, the conventional solar cell module does not have sufficient designability, and improvement is desired.

[0006] An object of the present invention is to provide a solar cell module with improved designability. [Means for Solving the Problem]

[0007] [1] As one aspect, the present invention relates to a solar cell module including at least one solar cell and a printed matter disposed on the light-receiving surface side of the solar cell and having a pattern printing layer. The pattern printing layer has a first color pattern composed of a plurality of first color dots and a second color pattern provided so as to overlap the first color pattern and composed of a plurality of second color dots. Each of the plurality of first color dots includes a first color binder and a plurality of first color pigment chips dispersed inside the first color binder, and each of the plurality of second color dots includes a second color binder and a plurality of second color pigment chips dispersed inside the second color binder. Either one of the plurality of first color pigment chips and the plurality of second color pigment chips is a plurality of colors of first interference pigments that generate different first interference lights from each other, and the other of the plurality of first color pigment chips and the plurality of second color pigment chips is a second interference pigment that generates a single-color second interference light different from the mixed color indicated by the plurality of colors of first interference pigments. At least one of the first interference pigment and the second interference pigment includes a small particle size grade interference pigment including a particle size range of 5 μm to 25 μm and a large particle size grade interference pigment including a particle size range of 25 μm to 40 μm. In the pattern printing layer of this solar cell module, the small particle size grade interference pigment is arranged so as to fill the gaps between the large particle size grade interference pigments, and the plurality of first interference lights and the second interference lights are additively mixed.

[0008] According to the studies by the present inventors, when the particle size of the interference pigment contained in the pattern printing layer is small, although the color development property is weak, it has been found that it is possible to suppress the pattern from looking dark even when the printed matter is placed in front of a solar cell such as black. On the other hand, when the particle size of the interference pigment contained in the pattern printing layer is large, although the transparency of the printed matter increases, it has been found that the color development property of the pattern can be made excellent. Therefore, the present inventors configured the interference pigment to include a small particle size grade interference pigment and a large particle size grade interference pigment, and arranged the small particle size grade interference pigment so as to fill the gaps between the large particle size grade interference pigments, thereby arriving at the idea of a solar cell module having a printed matter in which the pattern is prevented from looking dark and the color development property of the pattern is excellent. Therefore, according to the solar cell module having the above configuration, it is possible to provide a pattern having excellent visibility and color development property, and it is possible to improve the design property. Further, in this solar cell module, by including the large particle size grade interference pigment, a decrease in the transparency of the pattern printing layer is suppressed. Therefore, according to this solar cell module, a decrease in the transmitted light to the solar cell is favorably suppressed, and the power generation efficiency can be maintained.

[0009] [2] As another aspect, the present invention relates to a solar cell module including at least one solar cell and a printed matter having a pattern printing layer disposed on the light-receiving surface side of the solar cell. The pattern printing layer has a first color pattern composed of a plurality of first color dots and a second color pattern provided so as to overlap the first color pattern and composed of a plurality of second color dots. Each of the plurality of first color dots includes a binder for the first color and a plurality of first color pigment chips dispersed inside the binder for the first color, and each of the plurality of second color dots includes a binder for the second color and a plurality of second color pigment chips dispersed inside the binder for the second color. Either one of the plurality of first color pigment chips and the plurality of second color pigment chips is a plurality of colors of first interference pigments that generate different first interference lights from each other, and the other of the plurality of first color pigment chips and the plurality of second color pigment chips is a second interference pigment that generates a single color of second interference light different from the mixed color indicated by the plurality of colors of first interference pigments. At least one of the first interference pigment and the second interference pigment includes a small particle size grade interference pigment having a particle size range of 5 μm to 25 μm and a large particle size grade interference pigment having a particle size range of 25 μm to 60 μm. In the pattern printing layer of this solar cell module, the small particle size grade interference pigment is arranged so as to fill the gaps between the large particle size grade interference pigments, and the plurality of first interference lights and the second interference lights are additively mixed. According to this solar cell module, similarly to the above, the decrease in transmitted light with respect to the solar cell can be favorably suppressed, and the power generation efficiency can be maintained.

[0010] [3] In the solar cell module of the above [1] or [2], at least one of the small particle size grade interference pigment and the large particle size grade interference pigment may be an interference pigment containing titanium dioxide-coated mica. In this case, the wavelength of the interference light can be adjusted by adjusting the film thickness and transmittance of the titanium dioxide film. Also, the luminance sense can be improved by enhancing the smoothness of the mica surface.

[0011] [4] In any of the solar cell modules of [1] to [3] above, the printed matter may further have a translucent base material provided on the first color pattern. In this case, the pattern printing layer can be protected without reducing the transmitted light to the solar cell.

[0012] [5] In any of the solar cell modules of [1] to [4] above, the printed matter may further have a white pattern layer composed of a plurality of silver dots, and each of the plurality of silver dots may include a silver binder and a plurality of silver pigment chips dispersed inside the silver binder. The second color pattern may be provided on the white pattern layer. In this case, the color development of the first color pattern and the second color pattern is more excellent, and the pattern printing layer can have a pattern that gives a whitish impression.

[0013] [6] In any of the solar cell modules of [1] to [5] above, the printed matter may further have a transmissive smoke printing layer provided between the pattern printing layer and the solar cell. In this case, the color development of the first color pattern and the second color pattern is more excellent. Further, since the transmissive smoke printing layer has transmissivity, the reduction of the transmitted light to the solar cell is well suppressed.

[0014] [7] In any of the solar cell modules of [1] to [6] above, the thicknesses of the first color pattern and the second color pattern may each be 10 μm or less. In this case, the reduction of the transmitted light to the solar cell is well suppressed.

[0015] [8] In any of the solar cell modules of [1] to [7] above, both the first interference pigment and the second interference pigment may include a small particle size grade interference pigment including a particle size range of 5 μm to 25 μm and a large particle size grade interference pigment including a particle size range of 25 μm to 40 μm or 25 μm to 60 μm. In this case, the design property in the solar cell module can be further improved, and the reduction of the transmitted light to the solar cell is well suppressed.

[0016] [9]Any of the solar cell modules of [1] to [8] above may further include a glass substrate provided on the surface of the printed matter on the side opposite to the solar cell. In this case, since the printed matter is protected by the glass substrate, the weather resistance of the printed matter can be improved.

Effect of the Invention

[0017] According to the present invention, a solar cell module with improved design is provided.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0019] A specific example of a solar cell module according to an embodiment of the present invention will be described below with reference to the drawings. Note that the present invention is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims. In the following description, the same reference numerals are given to the same elements in the description of the drawings, and redundant descriptions are omitted.

[0020] FIG. 1 is a cross-sectional view schematically showing a solar cell module according to an embodiment. As shown in FIG. 1, the solar cell module 1 includes a thin plate-shaped solar cell 2, a backsheet 3, a sealing material layer 4, a surface plate 5, and a printed matter 6. The solar cell module 1 may further include a hard coat layer 7 on the surface side of the printed matter 6.

[0021] The solar cell 2 is a photoelectric conversion element formed in a thin plate shape with a thickness of about 0.2 mm, such as crystalline / amorphous silicon, thin film silicon, perovskite, chalcopyrite, III-V group, CdTe, CIS, etc., and mainly absorbs light with wavelengths in the visible light region to generate electricity. The solar cell 2 is embedded (sealed) in the sealing material layer 4 so that the light receiving surface 2a faces the printed matter 6. The light receiving surface 2a of the solar cell 2 exhibits black or dark blue. In the example shown in FIG. 1, only one solar cell 2 is shown, but the solar cell module 1 may include a plurality of solar cells 2.

[0022] The backsheet 3 is a member formed of polyethylene terephthalate (PET), polycarbonate resin, acrylic resin, glass, metal (such as aluminum) in a layered, film-like, or plate-like shape. The sealing material layer 4 is formed on such a backsheet 3.

[0023] The sealing material layer 4 is a layer formed of a transparent sealing material such as ethylene vinyl acetate (EVA), polyvinyl butyral (PVB), polyolefin resin, ionomer resin, silicone resin, etc. The sealing material layer 4 is formed by sealing the above-described solar cell 2 so as to surround it with a transparent sealing material. The thickness of the sealing material layer 4 is, for example, about 1 mm.

[0024] The front plate 5 is a transparent plate-like member disposed on the encapsulant layer 4 and protects the solar cell 2. The front plate 5 is provided so as to face the light-receiving surface 2a of the solar cell 2. The front plate 5 is formed from a transparent material such as polycarbonate resin, acrylic resin, or glass. The thickness of the front plate 5 is, for example, about 3 mm. Each of the backsheet 3 and the front plate 5 may be fixed to the encapsulant layer 4 by the adhesive force of the encapsulant material (resin, etc.) constituting the encapsulant layer 4, or may be fixed to the encapsulant layer 4 by an individual transparent adhesive.

[0025] The printed matter 6 is a member for imparting design to the solar cell module. The printed matter 6 is attached to the front surface side of the front plate 5 with a transparent adhesive or the like. Details of the printed matter 6 will be described later.

[0026] The hard coat layer 7 is a coat layer for protecting the printed matter 6. The thickness of the hard coat layer 7 may be, for example, 5 to 50 μm, preferably 10 to 40 μm, and more preferably 15 to 30 μm. The hard coat layer 7 may be formed from, for example, an active energy ray curable coating composition or a thermosetting coating composition that cures by ultraviolet irradiation or electron beam.

[0027] FIG. 2 is a cross-sectional view schematically showing the printed matter included in the solar cell module shown in FIG. 1. FIG. 3 is a cross-sectional view schematically showing the pattern printing layer included in the printed matter shown in FIG. 2. As shown in FIG. 2, the printed matter 6 is a sheet for expressing a pattern, and includes a translucent base material 8, a pattern printing layer 9, and a transmissive smoke printing layer 30. The printed matter 6 is provided in front of the solar cell 2. The printed matter 6 has total light transmittance. Therefore, when sunlight enters the solar cell module 1 through the printed matter 6, power generation can be performed from the sunlight by the solar cell 2. Also, the pattern expressed by the printed matter 6 can be visually recognized.

[0028] The light-transmitting substrate 8 is a substrate having visible light transmittance. The light-transmitting substrate 8 is, for example, made of a resin having transparency. Examples of the resin having transparency include PET, PMMA, polyethylene, polypropylene, nylon, etc. The thickness of the light-transmitting substrate 8 is, for example, 25 μm to 250 μm. Note that, if necessary, a surface protection layer may be provided on the surface side (the side opposite to the pattern printing layer 9) of the light-transmitting substrate 8.

[0029] The pattern printing layer 9 is a layer that expresses the pattern of the printed matter 6. The pattern printing layer 9 includes a first color pattern 10 provided on one surface 8a of the light-transmitting substrate 8 and a second color pattern 20 provided on the first color pattern 10.

[0030] The first color pattern 10 can be provided on the surface 8a of the light-transmitting substrate 8, for example, by screen printing, inkjet printing, gravure printing, or offset printing. As shown in FIG. 3, the first color pattern 10 is composed of a plurality of first color dots 11. Here, the "dot" means a point that is an element constituting a printed image, and its shape is not limited to a circular shape, and it may be a rectangular shape, a polygonal shape, or other shapes. Each of the plurality of first color dots 11 includes a first color binder 12 and a plurality of first color pigment chips 13 dispersed inside the first color binder 12. The content rate of the plurality of first color pigment chips 13 is, for example, in the range of 0.5 part by weight or more and 20 parts by weight or less when the first color binder 12 is 100 parts by weight.

[0031] Examples of the first color binder 12 include vinyl resins, acrylic resins, thermoplastic urethane resins, polyester resins, polycarbonate resins, etc. The thickness of the first color pattern 10 is, for example, 1 μm to 10 μm. Note that a curing agent may be contained in the first color pattern 10. In this case, the heat resistance of the first color pattern 10 and the adhesion of the first color pattern 10 to the light-transmitting substrate 8 can be improved.

[0032] The plurality of first-color pigment chips 13 are first interference pigments 14a, 14b of a plurality of colors that generate mutually different interference lights. Each of the first interference pigments 14a, 14b is composed of a thin sheet (not shown) having visible light transmissivity and a metal oxide film (not shown) covering the thin sheet. Among the incident lights from the light-transmissive base material 8 side to the first-color pattern 10, the light reflected on the surface of the metal oxide film and the light passing through the metal oxide film and reflected on the surface of the thin sheet interfere with each other to generate interference light. By adjusting the film thickness of the metal oxide film and the refractive index of the metal oxide film, interference light having a desired wavelength can be generated.

[0033] Each of the first interference pigments 14a, 14b is, for example, titanium dioxide-coated mica. The thin sheets constituting the first interference pigments 14a, 14b may be other than mica, and may be, for example, silica, alumina, glass, or polysilicate. The metal oxide films constituting the first interference pigments 14a, 14b may be other than titanium dioxide, and may be, for example, zirconium oxide, zinc oxide, iron oxide, or tin oxide.

[0034] The first interference pigment 14a includes a plurality of first titanium dioxide-coated muscovites 15a in a small particle size grade including a particle size range of 5 μm to 25 μm, and a second titanium dioxide-coated muscovite 15b in a large particle size grade including a particle size range of 25 μm to 40 μm. The first interference pigment 14b includes a plurality of first titanium dioxide-coated muscovites 16a in a small particle size grade including a particle size range of 5 μm to 25 μm, and a plurality of second titanium dioxide-coated muscovites 16b in a large particle size grade including a particle size range of 25 μm to 40 μm. The average particle size (D50) of the first titanium dioxide-coated muscovites 15a and 16a is, for example, about 15 μm, and the average particle size (D50) of the second titanium dioxide-coated muscovites 15b and 16b is, for example, about 25 μm. Accordingly, the average particle size of the first titanium dioxide-coated muscovites 15a and 16a is smaller than the average particle size of the second titanium dioxide-coated muscovites 15b and 16b. The second titanium dioxide-coated muscovites 15b and 16b may include a particle size range of 25 μm to 60 μm. In this case, the average particle size (D50) of the second titanium dioxide-coated muscovites 15b and 16b is, for example, about 35 μm. Each of the plurality of first titanium dioxide-coated muscovites 15a and 16a is arranged so as to fill the gaps between the plurality of second titanium dioxide-coated muscovites 15b and 16b, as shown in FIG. 3. Here, the "particle size" means the longest diameter of the particle cross-section.

[0035] When incident light L is incident on the first color pattern 10 from each of the first interference pigments 14a and 14b, a plurality of first interference lights 17a and 17b different from each other are generated respectively. That is, the wavelengths of the first interference lights 17a and 17b are different from each other. Accordingly, the first interference pigments 14a and 14b exhibit color mixing. Each of the first interference pigments 14a and 14b may be, for example, a red interference pigment (red pearl pigment) and a gold interference pigment (gold pearl pigment) respectively. In this case, each of the first interference lights 17a and 17b exhibits red and gold respectively. Each of the first interference pigments 14a and 14b may be an interference pigment of other colors. The blending amounts of the first interference pigments 14a and 14b may be the same or different from each other.

[0036] The second color pattern 20 can be provided on the first color pattern 10 by, for example, screen printing, inkjet printing, gravure printing, or offset printing. As shown in FIG. 3, the second color pattern 20 is composed of a plurality of second color dots 21. Here, the "dot" means a point that constitutes an element of a printed image, and its shape is not limited to a circular shape, and may be a rectangular shape, a polygonal shape, or other shapes. Each of the plurality of second color dots 21 includes a second color binder 22 and a plurality of second color pigment chips 23 dispersed inside the second color binder 22. The content rate of the plurality of second color pigment chips 23 is, for example, in the range of 0.5 parts by weight or more and 20 parts by weight or less when the second color binder 22 is 100 parts by weight.

[0037] Examples of the second color binder 22 include vinyl resins, acrylic resins, thermoplastic urethane resins, polyester resins, polycarbonate resins, and the like. The thickness of the second color pattern 20 is, for example, 1 μm to 10 μm. Note that a curing agent may be contained in the second color pattern 20. In this case, the heat resistance of the second color pattern 20 and the adhesion of the second color pattern 20 to the first color pattern 10 can be improved.

[0038] The plurality of second color pigment chips 23 are second interference pigments 24 that generate interference light of a single color different from the color mixture shown by the first interference pigments 14a and 14b. The second interference pigment 24 is composed of a thin sheet (not shown) having visible light transparency and a metal oxide film (not shown) covering the thin sheet. Among the incident light from the light-transmitting base material 8 side to the second color pattern 20, the light reflected on the surface of the metal oxide film and the light that passes through the metal oxide film and is reflected on the surface of the thin sheet interfere with each other to generate interference light. By adjusting the film thickness of the metal oxide film and the refractive index of the metal oxide film, interference light having a desired wavelength can be generated.

[0039] The second interference pigment 24 is, for example, titanium dioxide-coated mica. The flakes constituting the second interference pigment 24 may be other than mica, and may be, for example, silica, alumina, glass, or polysilicate. The metal oxide film constituting the second interference pigment 24 may be other than titanium dioxide, and may be, for example, zirconium oxide, zinc oxide, iron oxide, or tin oxide.

[0040] The second interference pigment 24 includes a plurality of first titanium dioxide-coated micas 25a of a small particle size grade including a particle size range of 5 μm to 25 μm, and a second titanium dioxide-coated mica 25b of a large particle size grade including a particle size range of 25 μm to 40 μm. The average particle size (D50) of the first titanium dioxide-coated mica 25a is, for example, about 15 μm, and the average particle size (D50) of the second titanium dioxide-coated mica 25b is, for example, about 25 μm. Accordingly, the average particle size of the first titanium dioxide-coated mica 25a is smaller than the average particle size of the second titanium dioxide-coated mica 25b. The second titanium dioxide-coated mica 25b may include a particle size range of 25 μm to 60 μm. In this case, the average particle size (D50) of the second titanium dioxide-coated mica 25b is, for example, about 35 μm. Each of the plurality of first titanium dioxide-coated micas 25a is arranged so as to fill the gaps between the plurality of second titanium dioxide-coated micas 25b. Here, the "particle size" means the longest diameter of the particle cross section.

[0041] When incident light L is incident on the second interference pigment 24, monochromatic second interference light 26 is generated. Accordingly, the second interference pigment 24 exhibits a single color. The second interference pigment 24 may be an interference pigment that generates monochromatic second interference light 26 different from the mixed colors exhibited by the first interference pigments 14a and 14b, and may be, for example, a green interference pigment (green pearl pigment). In this case, the second interference light 26 exhibits green. Note that the second interference pigment 24 may be an interference pigment of a color other than green.

[0042] The transmissive smoke printing layer 30 is a layer for attenuating light transmitted through the printed matter 6 within a range that does not affect photovoltaic power generation. The transmissive smoke printing layer 30 is provided on the outermost surface on the side opposite to the light-transmissive substrate 8 with respect to the pattern printing layer 9. In the first embodiment, the transmissive smoke printing layer 30 is provided on the second color pattern 20 (below in the drawing) as shown in FIG. 2. The transmissive smoke printing layer 30 can be provided on the second color pattern 20 by, for example, screen printing, inkjet printing, gravure printing, or offset printing using an ink in which a small amount of carbon black is dispersed in a resin binder such as a vinyl-based, acrylic-based, urethane-based, or polyester-based resin binder. The thickness of the transmissive smoke printing layer 30 is, for example, 1 μm to 10 μm.

[0043] In the printed matter 6, a pattern as a design is expressed by additive color mixing of the first interference lights 17a and 17b generated by the first interference pigments 14a and 14b and the second interference light 26 generated by the second interference pigment 24.

[0044] The total light transmittance of the printed matter 6 is, for example, 30% to 70%. The total light transmittance here means a value obtained by measuring the total light transmittance using a spectrophotometer (for example, UV-2100, manufactured by Shimadzu Corporation). Also, the light here is in the wavelength range from 380 nm to 780 nm.

[0045] In the solar cell module 1 according to the present embodiment described above, in the first color pattern 10 of the pattern printing layer 9 of the printed matter 6, each of the plurality of first titanium dioxide-coated muscovites 15a and 16a of a small particle size grade including a particle size range of 5 μm to 25 μm is arranged so as to fill the gaps between the plurality of second titanium dioxide-coated muscovites 15b and 16b of a large particle size grade including a particle size range of 25 μm to 40 μm. In the printed matter 6, in the second color pattern 20, each of the plurality of first titanium dioxide-coated muscovites 25a of a small particle size grade including a particle size range of 5 μm to 25 μm is arranged so as to fill the gaps between the plurality of second titanium dioxide-coated muscovites 25b of a large particle size grade including a particle size range of 25 μm to 40 μm. According to this solar cell module 1, a pattern excellent in visibility and color development can be provided, and the design property can be improved. Further, in this solar cell module 1, the first color pattern 10 includes the second titanium dioxide-coated muscovites 15b and 16b of a large particle size grade, and the second color pattern 20 includes the second titanium dioxide-coated muscovite 25b of a large particle size grade. Thereby, a decrease in the transparency of the pattern printing layer 9 is suppressed. Therefore, according to the solar cell module 1, a decrease in transmitted light to the solar cell 2 is favorably suppressed, and the power generation efficiency can be maintained.

[0046] In the solar cell module 1 according to the present embodiment, the second titanium dioxide-coated muscovites 15b, 16b, and 25b of a large particle size grade may have a configuration including a particle size range of 25 μm to 60 μm. In this case, the color development of the pattern is more excellent. Also, the power generation efficiency can be further maintained.

[0047] In the solar cell module 1 according to the present embodiment, the first interference pigments 14a and 14b and the second interference pigment 24 are interference pigments containing titanium dioxide-coated muscovite. Therefore, the wavelength of the interference light can be adjusted by adjusting the film thickness and transmittance of the titanium dioxide film. Also, the luminance sense can be improved by enhancing the smoothness of the mica surface.

[0048] In the solar cell module 1 according to the present embodiment, the printed matter 6 may include a transmissive smoke printing layer 30 provided between the pattern printing layer 9 and the solar cell 2. As a result, the color developability of the first color pattern 10 and the second color pattern 20 is more excellent, and the design can be further improved. Furthermore, since the transmissive smoke printing layer 30 has transmissivity, the decrease in transmitted light to the solar cell 2 is well suppressed.

[0049] As described above, the solar cell module 1 according to the present invention has been described. However, the solar cell module according to the present invention is not limited to the above-described embodiment, and various other modifications are possible. Hereinafter, a modification example of the printed matter 6 used in the solar cell module 1 and a modification example of the solar cell module 1 will be described.

[0050] [First Modification Example] FIG. 4 is a schematic cross-sectional view showing a first modification example of the printed matter. FIG. 5 is a cross-sectional view schematically showing a white pattern layer included in the printed matter shown in FIG. 4. As shown in FIG. 4, the printed matter 6A includes a translucent base material 8 and a pattern printing layer 9. The printed matter 6A further includes a white pattern layer 40 provided on (below in the drawing) the second color pattern 20.

[0051] The white pattern layer 40 can be provided on the second color pattern 20 of the pattern printing layer 9, for example, by screen printing, inkjet printing, gravure printing, or offset printing. As shown in FIG. 5, the white pattern layer 40 is composed of a plurality of silver dots 41. Each of the plurality of silver dots 41 includes a silver binder 42 and a plurality of silver pigment chips 43 dispersed inside the silver binder 42. The content rate of the plurality of silver pigment chips 43 is, for example, in the range of 0.5 parts by weight or more and 20 parts by weight or less when the silver binder 42 is 100 parts by weight.

[0052] Examples of the silver binder 42 include vinyl resins, acrylic resins, thermoplastic urethane resins, polyester resins, polycarbonate resins, and the like. The thickness of the white pattern layer 40 is, for example, 1 μm to 10 μm. Note that the white pattern layer 40 may contain a curing agent. In this case, the heat resistance of the white pattern layer 40 and the adhesion of the white pattern layer 40 to the second color pattern 20 can be improved.

[0053] Even in the solar cell module including the printed matter 6A described above, the same operational effects as those of the above-described embodiment can be obtained. Further, in the solar cell module according to this first modification, a white pattern layer 40 is provided on the second color pattern 20 and is composed of a plurality of silver dots 41, and each of the plurality of silver dots 41 includes a silver binder 42 and a plurality of silver pigment chips 43 dispersed inside the silver binder 42. Thereby, the color developability between the first color pattern 10 and the second color pattern 20 is excellent, and the pattern printing layer 9 can have a pattern that gives a whitish impression.

[0054] [Second Modification] FIG. 6 is a schematic cross-sectional view showing a second modification of the printed matter. As shown in FIG. 6, the printed matter 6B includes a translucent base material 8 and a pattern printing layer 9. That is, the printed matter 6B does not include the transmissive smoke printing layer 30 and the white pattern layer 40. Even in the solar cell module including the printed matter 6B described above, the same operational effects as those of the above-described embodiment can be obtained.

[0055] [Third Modification] FIG. 7 is a schematic cross-sectional view showing a third modification of the printed matter. As shown in FIG. 7, the printed matter 6C includes a translucent base material 8, a pattern printing layer 9, a white pattern layer 40, and a transmissive smoke printing layer 30. The white pattern layer 40 is provided on the second color pattern 20, and the transmissive smoke printing layer 30 is provided on the white pattern layer 40. Even in the solar cell module including the printed matter 6C described above, the same operational effects as those of the above-described embodiment can be obtained.

[0056] [Fourth Modification Example] FIG. 8 is a schematic cross-sectional view showing a modification example of the solar cell module. As shown in FIG. 8, the solar cell module 1A includes a thin plate-shaped solar cell 2, a backsheet 3, a sealing material layer 4, a surface plate 5, and a printed matter 6, similar to the solar cell module 1. As the printed matter 6, various modification examples described above may be used. Further, the solar cell module 1A further includes a glass substrate 7A on the surface side of the printed matter 6. That is, the glass substrate 7A is provided on the surface of the printed matter 6 on the side opposite to the solar cell 2. The glass substrate 7A may be fixed to the printed matter 6 by an adhesive or the like, or may be fixed by other means, and is not particularly limited. By providing the glass substrate 7A, the weather resistance of film members such as the printed matter 6 can be improved.

[0057] Note that the solar cell module according to the present invention is not limited to the above-described embodiments and various modification examples, and various further modifications are possible. For example, it may include a first interference pigment that generates first interference light with different second color patterns, and the first color pattern may include a second interference pigment that generates single-color second interference light different from the mixed color shown by a plurality of first interference pigments of the second color pattern.

[0058] Also, in the above-described embodiments and the like, each of the first interference pigment and the second interference pigment included a plurality of first titanium dioxide-coated muscovites and a plurality of second titanium dioxide-coated muscovites, but at least one of the first interference pigment and the second interference pigment may include a plurality of first titanium dioxide-coated muscovites and a plurality of second titanium dioxide-coated muscovites. Further, in the above-described embodiments and the like, the first color pigment chip was a two-color first interference pigment, but the first color pigment chip may be a three-color or more first interference pigment. Also, the plurality of first interference pigments may be mixed.

Explanation of Reference Numerals

[0059] 1, 1A... solar cell module, 2... solar cell, 2a... light-receiving surface, 3... backsheet, 4... encapsulant layer, 5... front plate, 6, 6A, 6B, 6C... printed matter, 7... hard coat layer, 7A... glass substrate, 8... light-transmissive substrate, 9... pattern printing layer, 10... first color pattern, 11... first color dots, 12... binder for the first color, 13... first color pigment chips, 14a, 14b... first interference pigments, 15a, 16a, 25a... first titanium dioxide-coated mica, 15b, 16b, 25b... second titanium dioxide-coated mica, 17a, 17b... first interference light, 20... second color pattern, 21... second color dots, 22... binder for the second color, 23... second color pigment chips, 24... second interference pigment, 26... second interference light, 30... transmissive smoke printing layer, 40... white pattern layer, 41... silver dots, 42... binder for silver, 43... silver pigment chips.

Claims

1. At least one solar cell, A printed matter having a pattern printing layer disposed on the light-receiving surface side of the solar cell, and a solar cell module comprising: The pattern printing layer is A first color pattern composed of a plurality of first color dots, A second color pattern provided so as to overlap the first color pattern and composed of a plurality of second color dots, Each of the plurality of first color dots includes a first color binder and a plurality of first color pigment chips dispersed inside the first color binder, Each of the plurality of second color dots includes a second color binder and a plurality of second color pigment chips dispersed inside the second color binder, Either one of the plurality of first color pigment chips and the plurality of second color pigment chips is a plurality of colors of first interference pigments that generate a plurality of different first interference lights, The other of the plurality of first color pigment chips and the plurality of second color pigment chips is a second interference pigment that generates a second interference light of a single color different from the mixed color indicated by the plurality of colors of first interference pigments, At least one of the first interference pigment and the second interference pigment includes an interference pigment of a small particle size grade including a particle size range of 5 μm to 25 μm and an interference pigment of a large particle size grade including a particle size range of 25 μm to 40 μm, The interference pigment of the small particle size grade is arranged so as to fill the gaps between the interference pigments of the large particle size grade, A solar cell module that adds and mixes the plurality of first interference lights and the second interference light.

2. At least one solar cell, A printed matter having a pattern printing layer disposed on the light-receiving surface side of the solar cell, and a solar cell module comprising: The pattern printing layer is A first color pattern composed of a plurality of first color dots, A second color pattern provided so as to overlap the first color pattern and composed of a plurality of second color dots, Each of the plurality of first color dots includes a first color binder and a plurality of first color pigment chips dispersed inside the first color binder, Each of the plurality of second color dots includes a second color binder and a plurality of second color pigment chips dispersed inside the second color binder, Either one of the plurality of first color pigment chips and the plurality of second color pigment chips is a plurality of colors of first interference pigments that generate a plurality of different first interference lights, The other of the plurality of first-color pigment chips and the plurality of second-color pigment chips is a second interference pigment that generates a second interference light of a single color different from the mixed color indicated by the plurality of first interference pigments of the plurality of colors. At least one of the first interference pigment and the second interference pigment includes an interference pigment of a small particle size grade including a particle size range of 5 μm to 25 μm and an interference pigment of a large particle size grade including a particle size range of 25 μm to 60 μm. The interference pigment of the small particle size grade is arranged so as to fill the gaps between the interference pigments of the large particle size grade. A solar cell module that performs additive color mixing of the plurality of first interference lights and the second interference light.

3. At least one of the interference pigment of the small particle size grade and the interference pigment of the large particle size grade is an interference pigment containing titanium dioxide-coated mica. The solar cell module according to claim 1 or 2.

4. The printed matter further has a light-transmissive base material provided on the first color pattern. The solar cell module according to claim 1 or 2.

5. The printed matter further has a white pattern layer composed of a plurality of silver dots. Each of the plurality of silver dots includes a silver binder and a plurality of silver pigment chips dispersed inside the silver binder. The second color pattern is provided on the white pattern layer. The solar cell module according to claim 1 or 2.

6. The printed matter further has a transmissive smoke printing layer provided between the picture printing layer and the solar cell. The solar cell module according to claim 1 or 2.

7. The thicknesses of the first color pattern and the second color pattern are each 10 μm or less. The solar cell module according to claim 1 or 2.

8. Both the first interference pigment and the second interference pigment include an interference pigment of a small particle size grade including a particle size range of 5 μm to 25 μm and an interference pigment of a large particle size grade including a particle size range of 25 μm to 40 μm or 25 μm to 60 μm. The solar cell module according to claim 1 or 2.

9. The printed matter further includes a glass substrate provided on the surface opposite to the solar cell. The solar cell module according to claim 1 or 2.

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