JP6413426B2 - Solar cell device - Google Patents

Description

  The present invention relates to a solar cell device.

Currently, as a measure to prevent global warming, efforts are being made to suppress CO ₂ emissions on a global scale, and solar cells are attracting attention as a clean power generation device that replaces thermal power generation and the like. When a solar cell is used as a power generator, a solar cell module in which a plurality of solar cells are electrically connected is usually configured. Such a solar cell module is installed outdoors, for example.

  In recent years, solar cell modules may be used by being mounted on various outdoor or indoor items. Specifically, in recent years, BIPV (building material integrated solar cell) and the like have attracted attention as one of the articles on which the solar cell module is mounted.

  In an article in which such a solar cell module is integrated, the design of the solar cell module may be a problem due to the difference between the appearance of the article and the appearance of the solar cell module. For example, in the above-mentioned BIPV, when the dark-colored light receiving surface of the solar cell module is exposed from the building material, there can be a large difference between the appearance of the building material and the appearance of the solar cell module. Such a difference in appearance greatly affects the landscape of buildings and towns, so that the design of the solar cell module may be a problem.

  Then, the technique which avoids the problem of the design property regarding the said light-receiving surface by providing desired design property to the light-receiving surface of a solar cell module is conventionally known (patent documents 1 thru / or patent documents 3).

  In Patent Document 1 and Patent Document 2, by providing a diffusion layer on the light-receiving surface side of the solar cell module, light is diffused by the diffusion layer, and the entire light-receiving surface is made white so that the light-receiving surface of the solar cell module is white. A technique for imparting designability is disclosed.

  Further, in Patent Document 3, the non-light-receiving surface side filler constituting the solar cell module is colored to color the space between the solar cell element and the solar cell element, thereby providing a design property on the light-receiving surface of the solar cell module. A technique for imparting is disclosed.

JP 11-298026 A Japanese Patent No. 5206899 JP 2011-210861 A

  By the way, as described above, when the solar cell module is mounted on an article outdoors or indoors, the solar cell module is integrated with a frame that covers an edge adjacent to the light receiving unit. It is common to be mounted on an article via the cable. However, in this case, the design property may be a problem due to the difference between the appearance of the light receiving portion of the solar cell module and the appearance of the frame.

  In the solar cell module in which the frame is integrated as described above, as a simple measure to prevent the design property from becoming a problem, the solar cell module and the frame can be integrally covered with a design layer. Conceivable. However, in such a measure, when the color of the solar cell module and the color of the frame body are greatly different, the portion of the design layer where the light receiving portion of the solar cell module faces and the frame body of the design layer As a result, shading occurs between the portions facing each other and color unevenness can occur as a whole. Therefore, the situation where the designability of a design layer is impaired may arise.

  The present invention has been made in consideration of such points, and the design layer provided so as to cover the light receiving portion of the solar cell module and the frame covering the edge of the solar cell module exhibits excellent design properties. An object of the present invention is to provide a solar cell device that can be used.

  The present invention provides a solar cell module having a front surface including a light receiving portion and an edge adjacent to the light receiving portion, and a frame having a covering portion that covers the edge of the front side of the solar cell module; A design layer provided directly or via another layer on the front side surface of the solar cell module and on the covering portion of the frame body, with the design layer removed, The solar cell device, wherein the difference between the brightness at the outermost surface in the region where the covering portion is provided and the brightness at the outermost surface in the region where the light receiving portion is provided is within 2.3. .

  Further, with the design layer removed, the color difference between the color of the outermost surface in the region where the covering portion is provided and the color of the outermost surface in the region where the light receiving portion is provided is 15.0. It may be within.

  The said design layer may spread integrally from the area | region in which the said light-receiving part is provided to the area | region in which the said coating | coated part is provided.

  The solar cell device may further include a colored layer provided between the covering portion of the frame body and the design layer.

  The solar cell device may further include a light diffusion layer provided between the light receiving portion of the solar cell module and the design layer.

  The light diffusion layer may extend from a region where the light receiving part is provided to a region where the covering part is provided.

  The design layer is formed as a separate body from the first design layer provided on the region where the light receiving portion is provided and the first design layer, and the region where the covering portion of the frame is provided And a second design layer provided thereon.

  In addition, the present invention provides a solar cell module having a front surface including a light receiving portion and an edge adjacent to the light receiving portion, and a frame having a covering portion that covers the edge of the front surface of the solar cell module. And a design layer provided on the front side surface of the solar cell module and on the covering portion of the frame body, directly or via another layer, the design layer includes a pattern, The brightness on the surface of the design layer on the area where the covering portion is provided in the state where the influence of the pattern is removed, and the brightness on the surface of the design layer on the area where the light receiving portion is provided This is a solar cell device whose difference is within 2.3.

  The color of the surface of the design layer on the area where the covering portion is provided in a state where the influence of the pattern is removed, and the area where the light receiving portion is provided where the influence of the pattern is removed The color difference from the surface color of the design layer is preferably within 15.0.

  ADVANTAGE OF THE INVENTION According to this invention, the design layer provided so that the frame which covers the light-receiving part of a solar cell module and the edge of a solar cell module may be exhibited can exhibit the outstanding design property.

It is a perspective view in the state where a part of solar cell device by a 1st embodiment of the present invention was fractured. It is a top view of the solar cell apparatus of FIG. It is sectional drawing which follows the III-III line of FIG. It is sectional drawing of the solar cell apparatus by the 2nd Embodiment of this invention. It is sectional drawing of the solar cell apparatus by the 3rd Embodiment of this invention. It is sectional drawing of the solar cell apparatus by the 4th Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings attached to the present specification, for the sake of illustration and ease of understanding, the scale, the vertical / horizontal dimension ratio, and the like are appropriately changed and exaggerated from those of the actual product.

(First embodiment)
1 to 3 show a solar cell device 1 according to a first embodiment of the present invention. FIG. 1 is a perspective view of a state in which a part of a solar cell device 1 according to the first embodiment is broken, FIG. 2 is a plan view of the solar cell device 1, and FIG. It is sectional drawing which follows an III-III line.

  As shown in FIGS. 1 to 3, the solar cell device 1 according to the present embodiment includes a solar cell module 10 having a front side surface 10a including a light receiving portion 10x and an edge portion 10y adjacent to the light receiving portion 10x, A frame body 20 having a covering portion 21 covering the edge portion 10y of the front side surface 10a of the battery module 10, and a light diffusion layer 28 provided on the front side surface 10a of the solar cell module 10 and the covering portion 21 of the frame body 20. And the design layer 30.

  In the present embodiment, the design layer 30 and the light diffusion layer 28 are integrally joined, and among these, the design layer 30 is disposed outside the diffusion layer 28 when viewed from the solar cell module 10 side. . In FIG. 1 and FIG. 2, the design layer 30 and the light diffusion layer 28 are schematically shown by a two-dot chain line for convenience of explanation.

  The solar cell module 10 of the present embodiment is formed in a rectangular plate shape, and a surface facing the one side among a surface facing one side and a surface facing the other side in a direction orthogonal to the planar direction is the surface facing the one side. , The front side surface 10a. In the front side surface 10a, the light receiving portion 10x is a portion that receives light from the one side in a direction orthogonal to the planar direction of the solar cell module 10, and has a rectangular shape. Hereinafter, the surface facing the one side of the light receiving unit 10x may be referred to as a light receiving surface, and the one side may be referred to as a light receiving surface side. On the other hand, the edge portion 10y is a portion located on the outer peripheral side of the light receiving portion 10x and adjacent to the light receiving portion 10x, and has a rectangular frame shape so as to surround the light receiving portion 10x.

  In the above description, it has been described that the light diffusion layer 28 and the design layer 30 are provided on the front side surface 10 a of the solar cell module 10 and the covering portion 21 of the frame body 20. Here, in this specification, when the light diffusion layer 28 and the design layer 30 are provided on the front side surface 10a, the light diffusion layer 28 and the design layer 30 are in the planar direction of the solar cell module 10 with respect to the front side surface 10a. It means that it is provided on the one side in the direction orthogonal to the surface, that is, provided on the light receiving surface side with respect to the front side surface 10a. Similarly, that the light diffusion layer 28 and the design layer 30 are provided on the covering portion 21 of the frame body 20 means that the light diffusion layer 28 and the design layer 30 are in the plane direction of the solar cell module 10 with respect to the covering portion 21. It means that it is provided on the one side in the orthogonal direction, that is, provided on the light receiving surface side with respect to the covering portion 21.

  The solar cell module 10 is configured by electrically connecting a plurality of solar cells (solar cell elements) (not shown) and sandwiching the plurality of solar cells by a pair of substrates (not shown). The solar cell constituting the solar cell module 10 is not particularly limited, and a known one can be appropriately selected and used. Examples of the solar cell include a single crystal silicone solar cell element, a polycrystalline silicon solar cell element, an amorphous silicon solar cell element, a compound semiconductor solar cell element, a dye-sensitized solar cell element, and a quantum dot solar cell. Examples thereof include battery elements and organic thin film solar cell elements.

  The frame body 20 of the present embodiment is formed as a frame extending along the periphery of the rectangle so as to cover the edge portion 10y of the solar cell module 10, and in detail, the frame body 10 is a covering that covers the edge portion 10y. The outer peripheral portion of the solar cell module 10 extends from the outer side in the plane direction by extending along the thickness direction of the solar cell module 10 (direction perpendicular to the planar direction of the solar cell module 10) from the outer periphery of the portion 21 and the covering portion 21. And a base portion 22 to be covered. In the present embodiment, the frame 10 has the base portion 22, but such a base portion 22 may be omitted.

  The frame 20 is made of, for example, an aluminum alloy, an iron alloy, a resin, a carbon compound, or the like, but the material is not particularly limited. However, the frame body 20 is a member that is directly fixed to an article and supports the solar cell module 10 on the article when the solar cell module 10 is assembled to an article such as a building material, and is required to have predetermined rigidity and strength. The Therefore, it is preferable that the material of the frame 10 is appropriately selected according to the weight of the solar cell module 10 and its installation environment.

  Further, as shown in FIG. 3, in the present embodiment, a colored layer 23 is provided on at least the covering portion 21 of the frame body 20. The colored layer 23 is covered with the light diffusion layer 28 and the design layer 30 together with the light receiving portion 10 x of the solar cell module 10. The colored layer 23 imparts an achromatic or chromatic color to the region where the colored layer 23 is provided.

  The coloring method of the colored layer 23 is not particularly limited, and may be appropriately colored using various known coloring materials. Specifically, various dyes and various pigments can be used in combination as appropriate. Further, the shape of the coloring material is not particularly limited, and spherical, needle-like, and scale-like particles may be used, and the size may be about 1 nm to 100 μm.

  The colored layer 23 may contain an arbitrary component in addition to the colorant. For example, components necessary for forming the colored layer 23 such as a resin as a binder, a solvent, and a dispersant can be arbitrarily blended.

  The thickness of the colored layer 23 is not particularly limited, and is appropriately designed in consideration of the portion where the colored layer 23 is formed, the overall configuration of the solar cell module 10, and the color expected of the colored layer 23. can do.

  Further, the method for forming the colored layer 23 is not particularly limited. For example, it may be formed by preparing an ink containing a coloring material and applying the ink on the covering portion 21 of the frame 20 by various application methods, or by forming the ink on the covering portion 21 by various printing methods. Good. Alternatively, a colored film or paper may be installed between the covering portion 21 and the design layer 30 and the light diffusion layer 28 to form the colored layer 23.

  As shown in FIG. 3, in the present embodiment, the light diffusion layer 28 is integrated from the region where the light receiving part 10 x of the solar cell module 10 is provided to the region where the covering part 21 of the frame 20 is provided. Has spread. The light diffusion layer 28 is in contact with the colored layer 23 provided on the covering portion 21, while facing the light receiving portion 10 x with the air layer 40 interposed therebetween. That is, in the present embodiment, the light diffusion layer 28 is provided on the covering portion 21 via the colored layer 23, and the light diffusion layer 28 is provided on the light receiving portion 10 x via the air layer 40. Yes. In addition, such an aspect is an example, for example, the light-diffusion layer 28 may be directly provided in the light-receiving part 10x in the state which contact | connected the light-receiving part 10x.

  When the air layer 40 is formed between the light diffusion layer 28 and the light receiving unit 10x as in the present embodiment, the air layer 40 does not need to be filled with a special gas, and air As long as it exists. Further, the air layer 40 does not have to be a continuous layer over the entire light receiving surface of the light receiving unit 10x of the solar cell module 10, and therefore, a spacer portion that contacts the light receiving unit 10x is formed in the light diffusion layer 28, and the spacer portion The air layer 40 may be formed in a region excluding.

  Further, the thickness of the air layer 40 is not particularly limited, and can be freely designed. The thickness of the air layer 40 is, for example, preferably about 1 nm to 1000 μm, and particularly preferably about 10 nm to 100 μm.

  The light diffusion layer 28 is not particularly limited as long as it can diffuse incident light. For example, various known light diffusion layers can be appropriately selected and used. For example, the light diffusion layer 28 can be produced by using a film made of a polyester resin, a polycarbonate resin, or a polyolefin resin and forming irregularities on the surface of the film.

  Next, the design layer 30 is a layer that can exhibit design properties by coloring, a pattern, a surface treatment, and the like, and is provided for imparting desired design properties to the solar cell device 1. Here, the pattern widely includes figures, patterns, designs, pictures, characters, images, characters, marks, numbers, and the like.

  As shown in FIG. 3, in the present embodiment, the design layer 30 extends integrally from a region where the light receiving portion 10 x of the solar cell module 10 is provided to a region where the covering portion 21 of the frame body 20 is provided. ing. The design layer 30 is opposed to the colored layer 23 provided on the covering portion 21 with the light diffusion layer 28 interposed therebetween, and is opposed to the light receiving portion 10 x with the air layer 40 and the light diffusion layer 28 interposed therebetween. That is, in the present embodiment, the design layer 30 is provided on the covering portion 21 via the colored layer 23 and the light diffusion layer 28, and the air layer 40 and the light diffusion layer 28 are provided on the light receiving portion 10x. The design layer 30 is provided. In addition, such an aspect is an example, for example, the design layer 30 may be directly provided in the light-receiving part 10x in the state which contact | connected the light-receiving part 10x via the light-diffusion layer 28. FIG.

  The coloring method and the forming method of the design layer 30 are not particularly limited and can be freely designed. The component of the design layer 30 is not particularly limited, and various dyes and various pigments can be used in appropriate combination as a coloring material. In the design layer 30, in addition to the colorant, components necessary for forming the design layer 30, such as a resin as a binder, a solvent, and a dispersant, can be arbitrarily added as optional components.

  When a pigment is used as the colorant of the design layer 30, it is preferable in that the weather resistance can be improved. On the other hand, when a dye is used as the colorant of the design layer 30, it is preferable in that a vivid color can be reproduced and the design property can be improved. Since the design can be reproduced, it is preferable in that a high light transmittance can be maintained even if the design layer 30 is formed as a solid layer.

  In addition, since the design layer 30 is located on the light receiving surface side of the solar cell module 10, that is, so as to cover the light receiving portion 10 x, the design layer 30 is as transparent as possible from the viewpoint of power generation efficiency of the solar cell module 10. Preferably it is. The transparency may be appropriately designed in consideration of the balance between the desired design and the desired power generation efficiency. The average transmittance of the design layer 30 varies depending on the desired design, but is preferably 20% or more, for example, 50% or more, more preferably 70% or more.

  Here, the average transmittance in this specification means the visible light transmittance in the in-plane average of the design layer 30. As the value of the visible light transmittance, for example, using a SM color computer SM-C (manufactured by Suga Test Instruments Co., Ltd.), a visible light wavelength region of 380 nm to 750 nm is measured, and measurement of 12 samples taken arbitrarily is performed. It is preferable from the viewpoint of accuracy improvement to adopt a value obtained by averaging the values. In addition, when there is a place where the visible light transmittance is greatly different in the surface of the design layer 30, such as when a pattern is formed on the design layer 30, a place with a relatively large occupied area is selected and averaged thereof. Adoption is sufficient.

  In the present embodiment, the light diffusion layer 28 and the design layer 30 are detachably provided to the solar cell module 10.

  By the way, in the solar cell device 1 of the present embodiment, in the state where the design layer 30 is removed, the brightness at the outermost surface in the region where the covering portion 21 is provided and the region where the light receiving portion 10x is provided. The difference between the brightness on the outermost surface and the brightness is adjusted to be within 2.3. The brightness difference between the brightness at the outermost surface in the region where the covering portion 21 is provided and the brightness at the outermost surface in the region where the light receiving portion 10x is provided is that the covering portion 21 of the frame 20, the colored layer 23 and The light diffusion layer 28 can be adjusted. As a result of extensive research conducted by the present inventors, it was possible to effectively prevent the occurrence of color unevenness in the design layer 30 when the brightness difference condition was satisfied. In addition, in order to make color unevenness inconspicuous, the brightness difference is preferably within 1.5.

  Specifically, in the present embodiment, when the design layer 30 is removed, in the region where the covering portion 21 is provided, the portion of the light diffusion layer 28 located on the colored layer 23 is the most designed. The surface of the portion located on the colored layer 23 of the light diffusion layer 28 (the surface facing the same direction as the direction in which the light receiving surface faces to receive light) is located on the side close to the layer 30. It becomes the outermost surface in the region where the covering portion 21 is provided when the design layer 30 is removed. On the other hand, in the region where the light receiving portion 10x is provided, the portion of the light diffusion layer 28 located on the light receiving portion 10x is located closest to the design layer 30 and the light diffusion layer 28 The region where the surface of the portion located on the light receiving portion 10x (the surface facing the same direction as the light receiving surface facing to receive light) is provided with the light receiving portion 10x when the design layer 30 is removed It becomes the outermost surface. Therefore, the colored layer 23 of the present embodiment has the lightness of the surface of the portion of the light diffusion layer 28 located on the colored layer 23 and the light reception of the light diffusion layer 28 with the design layer 30 removed. The difference between the brightness of the surface of the portion located on the portion 10x is adjusted to be within 2.3.

  The brightness value is determined by the modified Munsell color system by the American Optical Society, and can be measured using a spectrocolorimeter CM-700d (2 degrees field of view, light source C) manufactured by Konica Minolta.

  In the solar cell device 1 of the present embodiment, the color of the outermost surface in the region where the covering portion 21 is provided and the outermost region in the region where the light receiving portion 10x is provided, with the design layer 30 removed. The color difference ΔE between the surface color and the surface color is adjusted to be within 15.0. That is, the color difference ΔE between the color of the surface of the light diffusion layer 28 located on the colored layer 23 and the color of the surface of the light diffusion layer 28 located on the light receiving portion 10x is 15 0.0 or less. The color difference ΔE between the color of the outermost surface in the region where the covering portion 21 is provided and the color of the outermost surface in the region where the light receiving portion 10x is provided is the covering portion 21, the colored layer 23 and the light diffusion of the frame body 20. Adjustable by layer 28. The reason why the color difference ΔE is within the above-described range is that the color attribute of the surface of the light diffusion layer 28 located on the colored layer 23 and the position of the light diffusion layer 28 on the light receiving unit 10x. This is because the color attribute of the surface of the portion to be controlled is controlled to be close. As a result of extensive research conducted by the present inventors, it was possible to more effectively prevent the occurrence of color unevenness in the design layer 30 when the condition of the color difference ΔE was satisfied in addition to the condition of the brightness difference described above. . In the present embodiment, the color difference ΔE is set to a value of 15.0 or less. However, if the color difference ΔE is 25.0 or less, it is sufficient from the viewpoint of suppressing occurrence of color unevenness in the design layer 30. It was suitable.

  The color difference ΔE is calculated by the following formula.

ΔE = {(ΔL *) ² + (Δa *) ² + (Δb *) ² } ^1/2
ΔE: Color difference ΔL *, Δa *, Δb *: Values of L *, a *, b * of the surface color of the portion of the light diffusion layer 28 located on the light receiving portion 10 x and the light diffusion layer 28 The difference between the surface color of the portion located on the colored layer 23 and the values of L *, a *, b *

  L *, a *, and b * were recommended by the International Commission on Illumination (CIE) in 1976, determined by the L * a * b * color system defined in JIS Z8729, and manufactured by Konica Minolta. It can be measured using a spectrocolorimeter CM-700d (10 degree visual field, light source D65).

  When measuring the value of brightness and the values of L *, a *, and b *, the solar cell module 10 is excluded from the solar cell module 10 after the design layer 30 is removed from the completed solar cell module 10. Those values are measured from the light receiving surface side.

  In addition, from the viewpoint of suppressing the influence on the design layer 30, in the solar cell device 1 from which the design layer 30 is removed, the lightness value of the surface of the portion of the light diffusion layer 28 located on the colored layer 23 and the light It is preferable that the brightness value of the surface of the part located on the light receiving portion 10x in the diffusion layer 28 is adjusted so as to be in the range of 5 to 10. Furthermore, if the color of these areas is adjusted to an achromatic color, the overall appearance can be made beautiful white or light gray.

  Further, the color of the surface of the portion of the light diffusion layer 28 located on the colored layer 23 is the same color as the color of the surface of the portion of the light diffusion layer 28 of the solar cell module 10 located on the light receiving portion 10x. Can, but is not required. The same color means that the surface of the portion of the light diffusion layer 28 located on the colored layer 23 and the surface of the portion of the light diffusion layer 28 located on the light receiving portion 10x are adjacent to each other and observed from a position 10 m away. In this case, it is difficult to visually distinguish between the surface of the portion of the light diffusion layer 28 located on the colored layer 23 and the surface of the portion of the light diffusion layer 28 located on the light receiving unit 10x. Means to some extent.

  In the solar cell device 1 according to the present embodiment described above, the brightness at the outermost surface in the region where the covering portion 21 is provided and the region where the light receiving portion 10x is provided in a state where the design layer 30 is removed. The difference between the brightness at the outermost surface and the thickness is within 2.3. Thereby, the color nonuniformity in the part used as the foundation | substrate of the design layer 30 can be made not conspicuous. Then, by providing the design layer 30 so as to cover such a base portion, it is possible to suppress the occurrence of color unevenness in the design layer 30. Thereby, according to this Embodiment, the design layer 30 provided so that the frame 20 which covers the light-receiving part 10x of the solar cell module 10 and the edge part 10y of the solar cell module 10 may show the outstanding design property. can do.

  In the present embodiment, with the design layer 30 removed, the color of the outermost surface in the region where the covering portion 21 is provided and the color of the outermost surface in the region where the light receiving portion 10x is provided. The color difference ΔE is within 15.0. Thereby, since it is possible to further suppress the occurrence of color unevenness in the design layer 30, the design layer 30 can exhibit more excellent design properties.

  In the first embodiment, the light diffusion layer 28 is provided, but the light diffusion layer 28 may not be provided. In this case, if the difference between the brightness of the surface of the colored layer 23 and the brightness of the surface of the light receiving portion 10x (light receiving surface) is within 2.3 with the design layer 30 removed, The occurrence of color unevenness in the design layer 30 can be suppressed. In this case, the color difference ΔE between the color of the colored layer 23 and the color of the light receiving unit 10x is also obtained in a state where the design layer 30 is removed from the viewpoint of further suppressing the occurrence of color unevenness in the design layer 30. , 15.0 or less is preferable.

  Further, in the first embodiment, the colored layer 23 is provided, but with the design layer 30 removed, the brightness on the outermost surface in the region where the covering portion 21 is provided and the light receiving portion 10x If the difference between the brightness at the outermost surface in the provided region is within 2.3, the colored layer 23 is not necessarily provided. Also in this case, from the viewpoint of further suppressing the occurrence of color unevenness in the design layer 30, the color of the outermost surface in the region where the covering portion 21 is provided and the light receiving portion in a state where the design layer 30 is removed. It is preferable that the color difference ΔE with respect to the color of the outermost surface in the region where 10x is provided be within 15.0.

  In the first embodiment, the example in which the design layer 30 and the light diffusion layer 28 are joined has been described. However, the design layer 30 and the light diffusion layer 28 may not be joined.

  Further, in the first embodiment, the example in which the design layer 30 extends integrally from the region where the light receiving unit 10x is provided to the region where the covering unit 21 is provided has been described. However, the design layer 30 is a region where the first design layer provided on the region where the light receiving portion 10x is provided and the first design layer are formed separately from each other and the covering portion 21 of the frame 20 is provided. You may isolate | separate with the 2nd design layer provided on top. Also in this example, when the condition regarding the brightness difference described above is satisfied, the first design layer and the second design layer are configured identically, and between the surface of the first design layer and the surface of the second design layer. The occurrence of uneven color can be effectively prevented.

(Second Embodiment)
Next, a solar cell device 2 according to a second embodiment will be described with reference to FIG. Of the constituent parts of the second embodiment described below, the same reference numerals are given to the points that can be configured in the same manner as the constituent parts of the first embodiment described above. Differences from the form will be mainly described. FIG. 4 is a cross-sectional view of the solar cell device 2 of the second embodiment corresponding to FIG. 3 used in the first embodiment.

  As shown in FIG. 4, in the second embodiment, the first embodiment is that the light diffusion layer 28 is formed separately from the design layer 30 and is provided only on the light receiving unit 10 x in the solar cell module 10. This is different from the embodiment.

  In the second embodiment, when the design layer 30 is removed, the colored layer 23 is located on the side closest to the design layer 30 in the region where the covering portion 21 is provided. Is the outermost surface in the region where the covering portion 21 is provided when the design layer 30 is removed. On the other hand, in the region where the light receiving portion 10x is provided, the portion of the light diffusion layer 28 located on the light receiving portion 10x is located closest to the design layer 30 and the light diffusion layer 28 The surface of the portion located on the light receiving portion 10x is the outermost surface in the region where the light receiving portion 10x is provided when the design layer 30 is removed.

  And in 2nd Embodiment, in the state which removed the design layer 30, the brightness of the surface of the colored layer 23, and the brightness of the surface of the part located on the light-receiving part 10x of the light-diffusion layer 28, The difference is within 2.3. Further, with the design layer 30 removed, the color difference ΔE between the color of the surface of the colored layer 23 and the color of the surface of the light diffusion layer 28 located on the light receiving portion 10x is within 15.0. It has become.

  In the second embodiment, the air layer 40 as in the first embodiment is not formed between the light diffusion layer 28 and the light receiving unit 10x, but the air layer 40 is formed. An aspect may be sufficient.

  Also in the solar cell device 2 of the second embodiment as described above, the brightness at the outermost surface in the region where the covering portion 21 is provided and the light receiving portion 10x are provided with the design layer 30 removed. Since the difference between the brightness at the outermost surface in the region where the image is present is within 2.3, the color unevenness in the portion serving as the base of the design layer 30 can be made inconspicuous. Then, by providing the design layer 30 so as to cover such a base portion, it is possible to suppress the occurrence of color unevenness in the design layer 30. Thereby, also in 2nd Embodiment, the design layer 30 provided so that the frame 20 which covers the light-receiving part 10x of the solar cell module 10 and the edge part 10y of the solar cell module 10 may have the outstanding design property. It can be demonstrated. In addition, in order to make color unevenness inconspicuous, the brightness difference is preferably within 1.5.

  Also in the second embodiment, the color of the outermost surface in the region where the covering portion 21 is provided and the color of the outermost surface in the region where the light receiving portion 10x is provided, with the design layer 30 removed. The color difference ΔE is within 15.0. Thereby, since it is possible to further suppress the occurrence of color unevenness in the design layer 30, the design layer 30 can exhibit more excellent design properties.

  In the second embodiment, the colored layer 23 is also provided, but with the design layer 30 removed, the brightness at the outermost surface in the region where the covering portion 21 is provided and the light receiving portion 10x. If the difference between the brightness at the outermost surface in the region where is provided is within 2.3, the colored layer 23 is not necessarily provided. Also in this case, from the viewpoint of further suppressing the occurrence of color unevenness in the design layer 30, the color of the outermost surface in the region where the covering portion 21 is provided and the light receiving portion in a state where the design layer 30 is removed. It is preferable that the color difference ΔE with respect to the color of the outermost surface in the region where 10x is provided be within 15.0.

  Also in the second embodiment, the example in which the design layer 30 extends integrally from the region where the light receiving unit 10x is provided to the region where the covering unit 21 is provided has been described. However, the design layer 30 is a region where the first design layer provided on the region where the light receiving portion 10x is provided and the first design layer are formed separately from each other and the covering portion 21 of the frame 20 is provided. You may isolate | separate with the 2nd design layer provided on top. Also in this example, when the condition regarding the brightness difference described above is satisfied, the first design layer and the second design layer are configured identically, and between the surface of the first design layer and the surface of the second design layer. The occurrence of uneven color can be effectively prevented.

(Third embodiment)
Next, a solar cell device 3 according to a third embodiment will be described with reference to FIG. Of the constituent parts of the third embodiment described below, the same reference numerals are given to points that can be configured in the same manner as the constituent parts of the first or second embodiment described above. Differences from the second embodiment will be mainly described. FIG. 5 is a cross-sectional view of the solar cell device 3 of the third embodiment corresponding to FIG. 3 used in the first embodiment.

  As shown in FIG. 5, in the third embodiment, the design layer 30 is separated from the first design layer 31 and the first design layer 31 provided on the region where the light receiving unit 10 x is provided. And a second design layer 32 provided on a region where the covering portion 21 of the frame body 20 is provided.

  In the third embodiment, the first design layer 31 and the second design layer 32 include the same design. The state in which the same design is included in the first design layer 31 and the second design layer 32 means that, for example, the first design layer 31 and the second design layer 32 each include the same grain pattern. Or the same polka dot pattern is included. In addition, the base colors of the first design layer 31 and the second design layer 32 excluding the pattern are at least the same color even if there is a brightness difference or a color difference between them. In addition, a base place means the part which removed the design from the 1st design layer 31 and the 2nd design layer 32. FIG.

  The first design layer 31 of the third embodiment is joined to the light diffusion layer 28, and the first design layer 31 is provided on the light receiving unit 10 x in the solar cell module 10 via the light diffusion layer 28. It has been. As shown in the figure, the air layer 40 is not formed between the light diffusion layer 28 and the light receiving unit 10x as in the first embodiment, but the air layer 40 is formed. May be. On the other hand, the second design layer 32 is provided directly on the covering portion 21 of the frame body 20.

  In the third embodiment, the brightness on the surface of the design layer 30 on the region where the covering portion 21 is provided, that is, the surface of the second design layer 32 in a state in which the influence of the design on the design layer 30 is removed. And the difference in brightness between the surface of the design layer 30 on the region where the light receiving unit 10x is provided, that is, the surface of the first design layer 31, is within 2.3.

Here, to remove the influence of the design is intended to remove the change in brightness due to the coloring related to the design on the surface of the target design layer (the first design layer 31 and the second design layer 32). . Therefore, the brightness difference in a state where the influence of the pattern is removed can be evaluated by the brightness difference between the surfaces of the first design layer 31 and the second design layer 32 that are the target in a state where only the pattern is not formed. .
More specifically, when a design layer including a design is formed, a design layer may be formed by overlapping a lower layer that forms a base and an upper layer that forms a design in two layers. In this case, to remove the influence of the pattern is intended to remove the influence of the upper layer. And the brightness difference in the state which remove | eliminated the influence of the pattern in this case can be evaluated by the brightness difference between the surface of the lower layer of the 1st design layer 31 and the lower layer of the 2nd design layer 32 corresponding to a base. For example, when a pattern such as a wood grain pattern or a polka dot pattern is provided by the upper layer, the brightness of the surface of the lower layer of the first design layer 31 and the brightness of the lower surface of the second design layer 32 before forming the upper layer And the brightness difference. When a pattern such as a polka dot pattern is applied by the upper layer and the pattern is scattered, the brightness on the surface of the exposed lower layer of the first design layer 31 and the brightness on the surface of the lower layer of the second design layer 32 And can be evaluated by the difference.
When a design layer including a design is formed, the design layer may be formed by a single layer including a portion for forming a base and a portion for forming a design arranged by dividing a plane region. In this case, removing the influence of the pattern is intended to remove the influence of the part forming the pattern. And the brightness difference in the state which removed the influence of the pattern in this case is the brightness difference between the surface of the part which forms the base ground of the 1st design layer 31, and the part which forms the base ground of the 2nd design layer 32 Can be evaluated by For example, in the case where a pattern such as a wood grain pattern or a polka dot pattern is provided by the part forming the above pattern, the brightness and the second design on the surface of the part forming the base of the exposed first design layer 31 It can be evaluated by the difference in brightness at the surface of the part forming the base of layer 32.

  In the third embodiment, the color of the surface of the second design layer 32 in the state where the influence of the design in the first design layer 31 and the second design layer 32 is removed, and the surface of the first design layer 31. The color difference ΔE between these colors is within 15.0. The removal of the influence of the pattern here means the coloration related to the pattern on the surface of the target design layer (the first design layer 31 and the second design layer 32) as in the evaluation of the brightness difference described above. Intended to remove color changes. Therefore, the color difference in the state in which the influence of the design is removed is the same as that in the evaluation of the brightness difference described above, in the first design layer 31 and the second design layer 32 that are the target in the state where only the design is not formed. It can be evaluated by the color difference between the surfaces. Specifically, it can be evaluated by the color difference between the base color of the first design layer 31 and the base color of the second design layer 32.

  Here, in the third embodiment, the difference between the lightness on the surface of the second design layer 32 and the lightness on the surface of the first design layer 31 is within 2.3, and the second design layer In order that the color difference ΔE between the color of the surface 32 and the color of the surface of the first design layer 31 is within 15.0, the first design layer 31 and the second design layer 32 are used alone, that is, the sun. When observed in a state separated from the battery module 10, a brightness difference and a color difference are generated between the first design layer 31 and the second design layer 32. More specifically, the brightness of the first design layer 31 is higher than the brightness of the second design layer 32, and the color difference between the color of the first design layer 31 and the color of the second design layer 32 is, for example, 15 Within 0.0. This is determined according to the lightness of the light receiving part 10x of the solar cell module 10 being lower than the lightness of the covering part 21. If the brightness of the light receiving unit 10 x of the solar cell module 10 is higher than the brightness of the covering portion 21, the brightness of the first design layer 31 may be set lower than the brightness of the second design layer 32.

  In the solar cell device 3 according to the third embodiment as described above, the brightness on the surface of the design layer 30 on the region where the covering portion 21 is provided and the light receiving portion 10x are in a state where the influence of the pattern is removed. Since the difference in lightness on the surface of the design layer 30 on the provided region is within 2.3, color unevenness is conspicuous between the first design layer 31 and the second design layer 32. Can be effectively prevented. By this, the design layer 30 (the 1st design layer 31 and the 2nd design layer 32) provided so that the frame 20 which covers the light-receiving part 10x of the solar cell module 10 and the edge part 10y of the solar cell module 10 may be excellent. Design performance can be demonstrated. In addition, in order to make color unevenness inconspicuous, the brightness difference is preferably within 1.5.

  In addition, since the color difference ΔE between the surface color of the second design layer 32 and the color of the surface of the first design layer 31 in the state where the influence of the pattern is removed is within 15.0, the first design layer It is possible to effectively prevent the color unevenness from being conspicuous between the first design layer 32 and the second design layer 32, and the design layer 30 can exhibit more excellent design properties.

(Fourth embodiment)
Next, a solar cell device 4 according to a fourth embodiment will be described with reference to FIG. Of the constituent parts of the fourth embodiment, the same reference numerals are used to designate the same constituent parts as those in the first to third embodiments described above. Differences from the embodiment will be mainly described. In addition, FIG. 6 is sectional drawing of the solar cell apparatus 4 of the 4th this Embodiment corresponding to FIG. 3 used in 1st Embodiment.

  As shown in FIG. 6, in the fourth embodiment, as the solar cell module 10 gradually extends from the outer side to the inner side in the planar direction of the solar cell module 10 on the surface side of the covering portion 21 of the frame body 20. An inclined surface 21a extending so as to approach the light receiving unit 10x is formed. Along with this, the colored layer 23 provided on the covering portion 21 also gradually extends so as to approach the light receiving portion 10x of the solar cell module 10 as it extends from the outside to the inside in the planar direction of the solar cell module 10. It has become.

  In the fourth embodiment, the light diffusion layer 28 is provided directly on the front side surface 10 a of the solar cell module 10. And the coating | coated part 21 has covered the edge part 10y of the front side surfaces 10a of the solar cell module 10 via the light-diffusion layer 28. FIG.

  The design layer 30 is curved or folded at the boundary between the inclined surface 21a and the light diffusion layer 28 so as to be along the inclined surface 21a of the covering portion 21 (the inclined surface of the colored layer 23) and the light diffusion layer 28. It is bent and provided in contact with the inclined surface 21 a and the light diffusion layer 28.

  And in 4th Embodiment, in the state which removed the design layer 30, the brightness of the surface of the colored layer 23, the brightness of the surface of the part located on the light-receiving part 10x of the light-diffusion layer 28, The difference is within 2.3. Further, with the design layer 30 removed, the color difference ΔE between the color of the surface of the colored layer 23 and the color of the surface of the light diffusion layer 28 located on the light receiving portion 10x is within 15.0. It has become. Also in the solar cell device 4 of the fourth embodiment, the design layer 30 is excellent by suppressing the same effect as the first embodiment, that is, the occurrence of color unevenness in the design layer 30. It makes it possible to demonstrate its design characteristics.

  Moreover, in 4th Embodiment, the inclined surface 21a is formed in the coating | coated part 21, and the colored layer 23 is also inclined along with this, Therefore The design layer 30 is made into the coating | coated part 21 of the frame 20, and When it is provided along the light receiving part 10x of the solar cell module 10, it becomes easy to make a state in which no wrinkles or creases occur.

  As mentioned above, although each embodiment of this invention was described, in each embodiment, various replacement | exchange and a change can be performed. For example, the configuration of the inclined surface 21a of the covering portion 21 according to the fourth embodiment can be applied to other embodiments.

1, 2, 3, 4 Solar cell device 10 Solar cell module 10a Front side surface 10x Light receiving portion 10y Edge portion 20 Frame body 21 Cover portion 21a Inclined surface 22 Base portion 23 Colored layer 28 Light diffusion layer 30 Design layer 31 First design layer 32 Second design layer 40 Air layer

Claims (5)

A solar cell module having a front side surface including a light receiving portion and an edge adjacent to the light receiving portion;
A frame having a covering portion covering the edge of the front side surface of the solar cell module;
A design layer provided on the front side surface of the solar cell module and on the covering portion of the frame;
A light diffusion layer provided between the light receiving portion of the solar cell module and the design layer,
The light diffusion layer extends integrally from a region where the light receiving part is provided to a region where the covering part is provided,
With the design layer removed, the difference between the brightness at the outermost surface in the region where the covering portion is provided and the brightness at the outermost surface in the region where the light receiving portion is provided is 2.3. Is a solar cell device.   With the design layer removed, the color difference between the color of the outermost surface in the region where the covering portion is provided and the color of the outermost surface in the region where the light receiving portion is provided is within 15.0. The solar cell device according to claim 1.   The solar cell device according to claim 1 or 2, wherein the design layer integrally extends from a region where the light receiving unit is provided to a region where the covering unit is provided.   The solar cell device according to any one of claims 1 to 3, further comprising a colored layer provided between the covering portion of the frame and the design layer.   The design layer is formed as a separate body from the first design layer provided on the region where the light receiving portion is provided and the first design layer, and the region where the covering portion of the frame is provided The solar cell apparatus as described in any one of Claims 1-4 containing the 2nd design layer provided on the top.

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