Design method of Anti-reflection material and Anti-reflection material

Abstract

To provide a method for designing an anti-reflection material that can suppress the occurrence of light pollution and the decrease in power generation amount.SOLUTION: A method for designing an anti-reflection material 20 that suppresses light reflection includes a setting step of setting a target value for the light reflectance of a solar power generation panel 10 in an installed state in which the anti-reflection material 20 is attached to a surface 21, a first determination step of determining the refractive index of the anti-reflection material 20, a calculation step of calculating the light reflectance of the solar power generation panel 10 in an installed state on the basis of the refractive index of the anti-reflection material 20 determined in the first determination step, and a second determination step of determining the gloss level of the anti-reflection material 20 on the basis of the light reflectance calculated in the calculation step S50 and the target value.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a method for designing an anti-reflection material that suppresses reflection of light, and to a technology for an anti-reflection material. [Background technology]

[0002] Conventionally, techniques relating to antireflection materials that suppress light reflection have been publicly known, as described in Patent Document 1, for example.

[0003] The anti-reflection material of Patent Document 1 is intended to suppress the reflection of light from a solar power generation panel. The anti-reflection material is made of a glass plate with an uneven shape formed on the light-receiving surface that receives sunlight. The anti-reflection material can suppress the specular reflection of sunlight by diffusing the sunlight with the uneven shape.

[0004] However, when sunlight is diffused, the amount of light that passes through the anti-reflection material decreases, resulting in a decrease in the amount of power generated by the solar panel. As such, with conventional technology, it was difficult to suppress both the occurrence of light pollution due to the reflection of sunlight (causing discomfort to users of buildings around the solar panel) and the decrease in power generation. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-124491 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and the problem it aims to solve is to provide a design method for an anti-reflection material and an anti-reflection material that can suppress the occurrence of light pollution and the decrease in power generation amount. [Means for solving the problem]

[0007] The problem to be solved by the present invention is as described above, and the means for solving this problem will now be described.

[0008] That is, claim 1 provides a method for designing a reflection-suppressing material that suppresses light reflection, comprising: a setting step for setting a target value for the light reflectance of a solar power generation panel after installation, with the reflection-suppressing material attached to its surface; a first determination step for determining the refractive index of the reflection-suppressing material; a calculation step for calculating the light reflectance of the solar power generation panel after installation, based on the refractive index of the reflection-suppressing material determined in the first determination step; and a second determination step for determining the glossiness of the reflection-suppressing material, based on the light reflectance calculated in the calculation step and the target value.

[0009] In claim 2, in the calculation step, the reflectance of light is calculated as the reflectance of light when light in air is incident on the interface between the reflection suppressing material and air.

[0010] In claim 3, the calculation step further calculates, as the light reflectance, the reflectance of light when light in the reflection-suppressing material is incident on the interface between the reflection-suppressing material and the solar power generation panel, and the reflectance of light when light in the reflection-suppressing material is incident on the interface between the reflection-suppressing material and air.

[0011] In claim 4, the target value is set as an amount of light reflection corresponding to a target glossiness of the photovoltaic panel after installation.

[0012] In claim 5, in the second determining step, the glossiness of the reflection suppressing material is determined in accordance with the difference between the light reflectance calculated in the calculating step and the target value.

[0013] In claim 6, the anti-reflection material is designed by the anti-reflection material design method.

[0014] In claim 7, the surface of the anti-reflection material is processed to diffuse light. [Effects of the Invention]

[0015] The present invention has the following effects.

[0016] In claim 1, the specifications (refractive index, glossiness) of the anti-reflection material can be appropriately determined, so that the anti-reflection material can suppress the occurrence of light pollution and the decrease in power generation.

[0017] In claim 2, the calculation of the reflectance of light passing through the solar panel can be omitted, thereby reducing the burden of calculating the reflectance of light.

[0018] According to claim 3, the glossiness of the anti-reflection material can be appropriately set.

[0019] In claim 4, the target value can be appropriately set according to the gloss level.

[0020] According to claim 5, it is possible to effectively suppress the occurrence of light pollution and also to effectively suppress the decrease in the amount of power generated by the solar power generation panel.

[0021] According to claim 6, it is possible to suppress the occurrence of light pollution and also suppress the decrease in the amount of power generation.

[0022] According to claim 7, the occurrence of light pollution can be effectively suppressed. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a schematic diagram showing a solar power generation panel according to an embodiment of the present invention; [Figure 2] AA cross section. [Figure 3] A schematic diagram showing sunlight hitting a solar panel. [Figure 4]1 is a cross-sectional view showing a solar panel to which an anti-reflection material according to an embodiment of the present invention is attached. [Figure 5] A schematic diagram showing sunlight hitting the solar panel in Figure 4. [Figure 6] 10 is a flowchart showing a procedure for designing a reflection suppressing material. [Figure 7] A schematic diagram showing the direction of light when the angle of incidence is θB. [Figure 8] A schematic diagram showing the direction of light in a solar panel with anti-reflection material attached. [Figure 9] A schematic diagram showing the direction of light in a solar panel without anti-reflection material attached. DETAILED DESCRIPTION OF THE INVENTION

[0024] Below, a method for designing an anti-reflection material 20 according to one embodiment of the present invention and the anti-reflection material 20 will be described. Since the anti-reflection material 20 is attached to a solar power generation panel 10, the configuration of the solar power generation panel 10 will be described below first with reference to Figures 1 and 2. Figure 1 is a view of the solar power generation panel 10 as seen from the side where sunlight hits (the light-receiving side).

[0025] The solar panel 10 mainly comprises a cell 11, a sealant 12, a back sheet 13, and a surface material 14.

[0026] The cells 11 are used to convert solar energy into electrical energy. A plurality of cells 11 are provided and are electrically connected to each other.

[0027] 2 is for protecting the cell 11. The sealant 12 is provided so as to cover the cell 11. The sealant 12 is made of a material that transmits light (for example, a light-transmitting resin).

[0028] The backsheet 13 is intended to protect the back side (the side opposite to the light-receiving side) of the cell 11. The surface material 14 shown in Figures 1 and 2 is intended to protect the light-receiving side of the cell 11. The surface material 14 is made of a light-transmitting material (e.g., glass, etc.). The surface 14a of the surface material 14 is treated to diffuse light. For example, the surface 14a of the surface material 14 is treated with a matte finish that creates fine irregularities. This treatment diffuses sunlight on the surface 14a of the surface material 14, thereby reducing the glossiness of the surface material 14. Glossiness is an index that indicates the degree of glossiness of an object surface. Specifically, glossiness indicates, as a percentage, the degree to which light is specularly reflected by the surface of an object, based on the specular reflection light when light is reflected on a reference surface (a glass surface with a refractive index of 1.567).

[0029] FIG. 3 schematically illustrates the state in which sunlight strikes the solar panel 10. For ease of explanation, the cells 11, sealant 12, and backsheet 13 are omitted from FIG. 3. As shown in FIG. 3, when sunlight strikes the surface 14a of the surface material 14, part of the sunlight is reflected by the surface 14a. The rest of the sunlight is refracted by the surface 14a and passes through the surface material 14. When the sunlight strikes the cells 11 (see FIG. 2), electricity can be generated by the solar panel 10.

[0030] As described above, the glossiness of the surface material 14 is reduced by matte finishing or the like, so that when sunlight hits the surface material 14, the sunlight can be diffused by the surface 14a, reducing specular reflection (mirror reflection). However, when sunlight is diffused, much of the light (diffused light) with a large angle of incidence is reflected by the surface 14a, reducing the amount of light that transmits through the surface material 14. As such, the amount of power generated by the solar power generation panel 10 decreases as the glossiness decreases, so it is difficult to reduce both the occurrence of light pollution due to specular reflection of sunlight (causing discomfort to users of buildings around the solar power generation panel 10) and the reduction in power generation by simply adjusting the glossiness.

[0031] The reflection-suppressing material 20 of this embodiment shown in FIG. 4 is intended to suppress light reflection. The reflection-suppressing material 20 is made of a material that reflects light less easily than the surface material 14. Specifically, the reflection-suppressing material 20 is made of a material whose difference in refractive index with respect to air is smaller than the difference between the refractive index of the surface material 14 and the refractive index of air. The reflection-suppressing material 20 is formed in the form of a thin film. The reflection-suppressing material 20 is attached to the surface 14a of the surface material 14 so as to cover the surface material 14 (see FIG. 1). This suppresses specular reflection of light and increases the amount of light that passes through the surface material 14, compared to when the reflection-suppressing material 20 is not attached to the surface material 14. The suppression of specular reflection and light transmission will be described later.

[0032] Furthermore, the surface 21 of the anti-reflection material 20 of this embodiment is subjected to a process for diffusing light. Specifically, the surface 21 is subjected to a matte finish. By forming fine irregularities on the surface 21 in this manner, the glossiness of the anti-reflection material 20 is reduced. According to the anti-reflection material 20, sunlight is diffused on the surface 21, and specular reflection of light can be further suppressed (see FIG. 5 ).

[0033] The following describes the procedure (design method) for designing the reflection-reducing material 20. More specifically, the procedure for determining the refractive index and glossiness of the reflection-reducing material 20 will be described. In this embodiment, the refractive index and other parameters are determined by performing a gloss target value setting step S10, a gloss confirmation step S20, a reflectance target value setting step S30, a refractive index determination step S40, a reflectance calculation step S50, and a gloss adjustment step S60, all of which are shown in FIG. 6 . Note that, below, the state in which the reflection-reducing material 20 is attached to the surface material 14 (the state in FIG. 4 ) will be referred to as "after application." Also, below, the state in which the reflection-reducing material 20 is not attached to the surface material 14 (the state in FIG. 2 ) will be referred to as "before application."

[0034] The gloss target value setting step S10 is a step of setting a target value for glossiness of the solar power generation panel 10 after installation. In this embodiment, the composite of the solar power generation panel 10 (cells 11, surface material 14, etc.) and the reflection-reducing material 20 is referred to as the "solar power generation panel 10 after installation." The gloss target value is a value that indicates the glossiness that should be achieved in the solar power generation panel 10 after installation. More specifically, the gloss target value indicates the degree of specular reflection that is acceptable on the solar power generation panel 10 after installation, expressed in terms of glossiness. A value that can suppress the occurrence of light pollution is set as the gloss target value.

[0035] Here, if the glossiness (glossiness of the solar panel 10 after installation) is about 10% when the incident angle is 60°, it is considered possible to sufficiently diffuse sunlight and effectively suppress the occurrence of light pollution. For this reason, in the setting step S10 of this embodiment, 10% is set as the target value of the glossiness when the incident angle is 60°.

[0036] The gloss confirmation step S20 is a step of confirming the glossiness of the pre-installation solar panel 10 (surface material 14). In the gloss confirmation step S20, for example, a gloss meter is used to measure the glossiness of the surface material 14.

[0037] As described above, in this embodiment, a target value for glossiness is set when the incident angle is 60°. Therefore, in the confirmation step S20 of this embodiment, the glossiness of the surface material 14 is measured when the incident angle (60°) is the same as the target value. Below, the contents of other steps (target value setting step S30, etc.) will be explained assuming that the measurement result is 20%. Also, below, the glossiness when the incident angle is 60° will be simply referred to as "glossiness."

[0038] The step S30 of setting the target value of the reflection amount is a step of setting a target value for the amount of light reflection (total specular reflection) of the photovoltaic panel 10 after installation. The amount of light reflection indicates how much light is reflected (specularly reflected) by an object when light is incident on that object. The amount of light reflection is expressed as a percentage, with the amount of light incident on the object being 100%. When sunlight hits the photovoltaic panel 10 after installation, the sunlight is reflected by the reflection-reducing material 20 and the surface material 14 (see FIG. 5), but the amount of sunlight reflected by the surface material 14 is thought to be relatively small. For this reason, in this embodiment, the amount of light reflection by the reflection-reducing material 20 is used as the amount of light reflection of the photovoltaic panel 10 after installation.

[0039] The target value for the amount of reflection is a value that indicates the amount of light reflection that should be achieved by the anti-reflection material 20 (the photovoltaic panel 10 after installation). The target value may directly indicate the amount of light reflection (for example, 10% light reflection), or may indirectly indicate the amount of light reflection. When the target value indirectly indicates the amount of light reflection, it is sufficient that the amount of light reflection can be calculated using the target value. For example, the target value may be the degree of reduction in the amount of light reflection (for example, a 50% reduction) based on the photovoltaic panel 10 before installation. An example of the setting process S30 will be described below.

[0040] As described above, the target gloss value (gloss that can suppress light pollution) is set to 10% when the incident angle is 60° in the setting step S10. In contrast, the gloss of the surface material 14 of this embodiment (measurement result in the confirmation step S20) is 20%.

[0041] As mentioned above, glossiness indicates the degree to which light is specularly reflected from an object surface, with the specularly reflected light when light is reflected from a reference surface as a reference. Focusing on specularly reflected light in glossiness, it is believed that reducing specularly reflected light by 50% (reducing glossiness to 10%) compared to before application (glossiness of 20%) can effectively suppress the occurrence of light pollution. Therefore, in the setting step S30, a 50% reduction in the amount of light reflection is set as the target value. In this way, in the setting step S30, a target value for the amount of reflection is set according to the target value of glossiness.

[0042] The refractive index determination step S40 is a step of determining the refractive index of the reflection-reducing material 20. In the determination step S40, the refractive index of the reflection-reducing material 20 is set (determined) so that the refractive index of the reflection-reducing material 20 is lower than that of the surface material 14. The reflectance of light is an index that indicates how much light is reflected (specularly reflected) by an object when the light incident on the object is 100%. In this embodiment, the amount of light reflected is expressed as a percentage of the light incident on the object, with the amount of light incident on the object being 100%, so the reflectance of light is the same as the amount of light reflected. Here, the smaller the difference between the refractive index of the incident side (air) and the refractive index of the transmitted side (reflection-reducing material 20), the less light is reflected. Therefore, it is desirable that the difference between the refractive index of the reflection-reducing material 20 and the refractive index of air (1) be smaller than the difference between the refractive index of the surface material 14 and the refractive index of air. Furthermore, because light that passes through the reflection-reducing material 20 is also reflected by the surface material 14 (see FIG. 5), it is desirable that the difference between the refractive index of the reflection-reducing material 20 and the refractive index of the surface material 14 be relatively small. The refractive index of the reflection suppression material 20 can satisfy the above requirements as long as it is within the range between the refractive index of air (1) and the refractive index of the surface material 14, so in this embodiment, any value within that range is set as the refractive index of the reflection suppression material 20.

[0043] The refractive index of the anti-reflection material 20 is preferably a value near the middle of the above range, which makes it possible to reduce both the difference between the refractive index of the anti-reflection material 20 and that of air, and the difference between the refractive index of the anti-reflection material 20 and that of the surface material 14, thereby effectively suppressing light reflection.

[0044] The refractive index of the surface material 14 can be estimated from the material of the surface material 14. In this embodiment, the refractive index of the surface material 14 is 1.6. The refractive index of the anti-reflection material 20 is set to an intermediate value (1.3) between the refractive indexes of air and the surface material 14. The material of the anti-reflection material 20 is appropriately selected based on the refractive index. In this embodiment, a material with a refractive index of 1.3 is selected.

[0045] Note that the content of the determining step S40 described above is an example and can be changed as appropriate. For example, in the determining step S40, the refractive index of the anti-reflection material 20 is set to 1.3, and a material with that refractive index is selected. However, it may be difficult to select a material with the same refractive index as the set refractive index. Therefore, a material that satisfies the above requirements (a material whose refractive index is within the range between the refractive index of air and the refractive index of the surface material 14) may be selected in the determining step S40, and the reflectance calculation step S50 may be performed using the refractive index of the selected material.

[0046] The reflectance calculation step S50 is a step of calculating the refraction angle θ1 of the reflection-suppressing material 20 shown in Fig. 8, a first reflectance R1 of light, and the like, based on the refractive index and the like of the reflection-suppressing material 20. In this embodiment, the refraction angle θ1 and the like are calculated by the following Formulas 1 and 2, so Formulas 1 and 2 will first be described with reference to Fig. 7.

[0047] FIG. 7 shows the direction in which light travels when it travels through material B and is incident on interface K with material A. Equation 1 is expressed by the angle of incidence θ B , refraction angle θ A , the refractive index of material A, n A and the refractive index n of substance B B In this embodiment, the refraction angle θ A is used to calculate

number

[0048] The following equation 2 is the reflectance R of light incident on the interface K and the incident angle θ B and the refractive index of material A, n A This is an equation showing the relationship between the above, and is used to calculate the reflectance R in this embodiment.

number

[0049] The following describes the details of the reflectance calculation step S50. In the calculation step S50, the first reflectance R1 of the reflection suppressing material 20, the reflectance R2 of the surface material 14, and the second reflectance R11 is calculated. In calculation step S50, the reflectance R0 of the surface material 14 shown in Fig. 9 is calculated. Note that Fig. 8 shows the direction in which light travels when it hits the solar power generation panel 10 after installation. Also, Fig. 9 shows the direction in which light travels when it hits the solar power generation panel 10 before installation.

[0050] In the following, the first reflectance R1 of the anti-reflection material 20 and the reflectance R of the surface material 14 shown in FIG. 2、 The second reflectance R of the anti-reflection material 20 11 9, the calculation procedure will be described in the order of the reflectance R0 of the surface material 14, but the order of calculating the first reflectance R1 and the like in the calculation step S50 is not limited to this embodiment. For example, since the reflectance R0 can be calculated without considering other reflectances (the first reflectance R1, etc.), the reflectance R0 may be calculated first.

[0051] The first reflectance R1 shown in FIG. 8 is the ratio of light reflected at the interface K1 between the air and the reflection-suppressing material 20 to light in the air that is incident on the interface K1. When calculating the first reflectance R1, the refraction angle θ1 when light is incident on the interface K1 is first calculated using the above-mentioned formula 1. When calculating the refraction angle θ1, n in the above-mentioned formula 1 is used. B The refractive index of air (1) is substituted into n A As described above, in this embodiment, the target value is set according to the glossiness when the incident angle is 60°. B In this way, the refraction angle θ1 (approximately 41°) is calculated using the above formula 1.

[0052] After the refraction angle θ1 is calculated, the first reflectance R1 is calculated based on the calculation result of the refraction angle θ1 and the above-mentioned formula 2. Specifically, the refraction angle θ A Substitute the calculated refraction angle θ1 (approximately 41°) into the other variables (n A , n B , incident angle θ B) the same value as when calculating the refraction angle θ1, the first reflectance R1 is calculated. In this way, the first reflectance R1 (approximately 0.106) is calculated using the above formula 2. Note that in FIG. 8, the first reflectance R1 is shown as a percentage. The reflectance R2 of the surface material 14, which will be described later, is also shown as a percentage.

[0053] When the first reflectance R1 is approximately 0.106, approximately 10.6% of the light incident on the installed solar power generation panel 10 is specularly reflected, and the remaining approximately 89.4% is transmitted through the reflection-suppressing material 20.

[0054] Next, a procedure for calculating the reflectance R2 of the surface material 14 will be described. The reflectance R2 is the reflectance at the surface material 14 of light that passes through the above-mentioned reflection-suppressing material 20. Specifically, the reflectance R2 is the proportion of light that is reflected at the interface K2 between the reflection-suppressing material 20 and the surface material 14, relative to the light that enters the reflection-suppressing material 20 at the interface K2. Similar to the first reflectance R1, the reflectance R2 is calculated using the above-mentioned formulas 1 and 2.

[0055] More specifically, when calculating the reflectance R2, the refraction angle θ2 (approximately 32°) when light is incident on the interface K2 is first calculated using the above-mentioned formula 1. Then, the calculation result and the refractive index (1.6) of the surface material 14, etc. are substituted into the above-mentioned formula 2. As a result, the reflectance R2 (approximately 0.026) is calculated.

[0056] As described above, when light is incident on the installed solar power generation panel 10, approximately 89.4% of the light is transmitted through the reflection-reducing material 20. If the reflectance R2 of the surface material 14 is approximately 0.026, of this 89.4% of light, approximately 2.6% (approximately 2.3% of the total) is reflected by the surface material 14. The remaining light (approximately 87.1% of the total) is transmitted through the surface material 14. Note that although a portion of the light that transmits through the reflection-reducing material 20 and the surface material 14 is actually absorbed by the reflection-reducing material 20, etc., this embodiment does not take light absorption into consideration for the sake of convenience.

[0057] Next, the second reflectance R of the reflection suppressing material 20 11 The procedure for calculating the second reflectance R11 is the reflectance of the light reflected by the surface material 14 (approximately 2.3% of the total light) in air. Specifically, the second reflectance R 11 is the ratio of light reflected at the interface K1 between the air and the surface material 14 to light entering the anti-reflection material 20 at the interface K1. 11 is calculated by the above formulas 1 and 2, similarly to the first reflectance R1.

[0058] More specifically, the second reflectance R 11 When calculating the second reflectance R, first, the refraction angle (60°) when light is incident on the interface K1 is calculated using the above formula 1. Then, the calculation result and the refractive index (1.3) of the anti-reflection material 20 are substituted into the above formula 2. As a result, the second reflectance R 11 (approximately 0.105) is calculated.

[0059] As described above, of the light transmitted through the reflection suppressing material 20, approximately 2.6% (approximately 2.3% of the total) is reflected by the surface material 14. The second reflectance R 11 When is approximately 0.105, of this approximately 2.6% of light, approximately 10.5% (approximately 0.24% of the total) is reflected by the air.

[0060] Next, a procedure for calculating the reflectance R0 of the surface material 14 shown in Fig. 9 will be described. As shown in Fig. 9, the reflectance R0 is the reflectance of light when light directly hits the surface material 14 (before application). Specifically, the reflectance R0 is the ratio of light reflected at the interface K0 between the air and the surface material 14 to light in the air that enters the interface K0. The reflectance R0 is calculated using the above formulas 1 and 2, similar to the first reflectance R1.

[0061] More specifically, when calculating the reflectance R0, the refraction angle θ0 (approximately 33°) when light is incident on the interface K0 is calculated using the above formula 1. Then, this calculation result and the refractive index (1.6) of the surface material 14, etc. are substituted into the above formula 2. As a result, the reflectance R0 (approximately 0.209) is calculated. Note that in Figure 9, the reflectance R0 is shown as a percentage.

[0062] When the reflectance R0 is approximately 0.209, approximately 20.9% of the light incident on the photovoltaic panel 10 before installation is specularly reflected, and the remaining approximately 79.1% is transmitted through the surface material 14.

[0063] 6 is a step of adjusting (determining) the glossiness of the reflection-suppressing material 20 based on the target value set in the target reflectance value setting step S30 and the first reflectance R1 calculated in the reflectance calculation step S50. In the adjustment step S60 of this embodiment, the glossiness of the reflection-suppressing material 20 is adjusted so as to achieve the target reflectance value based on the first reflectance R1, etc. This will be described in detail below.

[0064] As described above, in this embodiment, a 50% reduction in the amount of light reflection (reducing the amount of light reflection by 50%) is set as the target value. The reflectance R0 of the surface material 14 before application is approximately 20.9% (see FIG. 9). Therefore, if the calculated result of the first reflectance R1 were 10.45% or less, the target value would be achieved. However, the calculated result of the first reflectance R1 in this embodiment is approximately 10.6% (see FIG. 8). In this way, if the calculated result of the first reflectance R1 does not achieve the target value, the gloss level is set in the adjustment step S60 so that the target value can be achieved.

[0065] For example, the gloss level is determined according to the difference between the calculation result of the first reflectance R1 and the target value of the amount of reflection (the light reflectance corresponding to the target value, specifically 10.45%). In this embodiment, the difference is 0.15%, so the gloss level of the reflection-suppressing material 20 is determined so that the light reflectance of the reflection-suppressing material 20 decreases by 0.15% or more. A matte finish corresponding to the determined gloss level is applied to the surface 21 of the reflection-suppressing material 20.

[0066] 6 is attached to the surface material 14, the light reflectance (amount of specularly reflected light) can be reduced to the same level as when the gloss of the solar panel 10 is 10%, thereby suppressing the occurrence of light pollution.

[0067] Furthermore, as the light reflectance decreases, the light transmittance increases (see 87.1 in FIG. 8 and 79.1 in FIG. 9). Therefore, it is possible to suppress the decrease in power generation amount in the solar panel 10 more effectively than when suppressing light pollution reflection by adjusting the gloss level alone.

[0068] In this embodiment, the gloss level is set in the adjustment step S60 using the first reflectance R1 among the reflectances calculated in the calculation step S50, but the information used when adjusting the gloss level is not limited to the first reflectance R1. For example, in addition to the first reflectance R1, the reflectance R2 and the second reflectance R 11 This allows the gloss level to be set taking into consideration the light reflected by the surface material 14 (approximately 2.3% of the light shown in FIG. 8), thereby more effectively suppressing light pollution.

[0069] As described above, the design method for the reflection-suppressing material 20 according to this embodiment is a design method for the reflection-suppressing material 20 that suppresses light reflection, and includes a setting step S30 in which a target value for the light reflectance of the solar power generation panel 10 after installation in which the reflection-suppressing material 20 is attached to the surface 21 is set; a first determination step (refractive index determination step S40) in which the refractive index of the reflection-suppressing material 20 is determined; a calculation step S50 in which the light reflectance of the solar power generation panel 10 after installation is calculated based on the refractive index of the reflection-suppressing material 20 determined in the first determination step; and a second determination step (adjustment step S60) in which the gloss level of the reflection-suppressing material 20 is determined based on the light reflectance calculated in the calculation step S50 and the target value. The "target value for light reflectance" is a value that can obtain the reflectance that should be achieved by the solar power generation panel 10 after installation. The target value for reflectance may be a value that indicates the reflectance itself, or may be a target value for an index that is correlated with the reflectance. In this embodiment, as an example of the target value for reflectance, a target value for the amount of light reflection (a 50% reduction in the amount of reflection) is set in the setting step S30.

[0070] By configuring it in this manner, the specifications (refractive index, glossiness) of the reflection-reducing material 20 can be appropriately determined, and the reflection-reducing material 20 can suppress the occurrence of light pollution and the decrease in power generation amount.

[0071] In addition, the calculation step S50 calculates the reflectance of light when light in air is incident on the interface K1 between the reflection suppression material 20 and air (first reflectance R1) as the reflectance of light (see Figure 8).

[0072] By configuring in this way, it is possible to omit the calculation of the reflectance of light passing through the solar power generation panel 10, and reduce the burden of calculating the reflectance.

[0073] In the calculation step S50, the reflectance of light is calculated by dividing the reflectance R2 of light when the light in the reflection-suppressing material 20 is incident on the interface K2 between the reflection-suppressing material 20 and the solar power generation panel 10, and the reflectance R1 of light when the light in the reflection-suppressing material 20 is incident on the interface K1 between the reflection-suppressing material 20 and air (second reflectance R2). 11 ) and are further calculated (see FIG. 8).

[0074] By configuring it in this way, the glossiness of the reflection-suppressing material 20 can be appropriately determined taking into consideration the reflectance of light passing through the reflection-suppressing material 20.

[0075] The target value is set as the amount of light reflection corresponding to the target glossiness (target value of glossiness) of the photovoltaic panel 10 after installation.

[0076] By configuring in this way, it is possible to appropriately set the target value according to the glossiness. For example, it is thought that the photovoltaic panel 10 after installation can effectively suppress light pollution when the glossiness is a predetermined value (e.g., about 10%). Therefore, if the target value is set so as to reduce the amount of light reflection to the same level as the predetermined value, it is possible to effectively suppress the occurrence of light pollution.

[0077] In addition, in the second determination process (adjustment process S60), the glossiness of the reflection suppression material 20 is determined according to the difference between the light reflectance (first reflectance R1) calculated in the calculation process S50 and the target value (0.15% in this embodiment).

[0078] With this configuration, it is possible to diffuse light on the surface 21 of the anti-reflection material 20 only as much as necessary, and therefore it is possible to effectively prevent a decrease in the amount of power generated by the solar panel 10.

[0079] As described above, the antireflection material 20 according to this embodiment is designed by the method for designing the antireflection material 20 described above.

[0080] By configuring in this way, it is possible to suppress the occurrence of light pollution and the decrease in the amount of power generation.

[0081] Furthermore, a surface 21 of the anti-reflection material 20 is subjected to a process (matt process in this embodiment) for diffusing light.

[0082] With this configuration, light is diffused on the surface 21 of the anti-reflection material 20, and light pollution can be effectively suppressed.

[0083] The refractive index determining step S40 according to this embodiment is an embodiment of the first determining step according to the present invention. The adjustment step S60 according to this embodiment is an embodiment of the second determination step according to the present invention.

[0084] Although the embodiment of the present invention has been described above, the present invention is not limited to the above configuration, and various modifications are possible within the scope of the invention described in the claims.

[0085] For example, in this embodiment, the reflection of light is suppressed by the thin film-like reflection suppressing material 20, but the thickness and shape of the reflection suppressing material 20 are not limited to those in this embodiment.

[0086] Furthermore, the configuration of the solar panel 10 is not limited to this embodiment. For example, the surface material 14 of the solar panel 10 does not need to be subjected to a light-diffusing treatment (such as a matte finish).

[0087] Furthermore, the glossiness in this embodiment is the glossiness when the angle of incidence is 60°, but this is just one example, and the reflection suppression material 20 may also be designed based on the glossiness when the angle is other (for example, 45°, etc.).

[0088] In addition, in this embodiment, the target value of the amount of reflection is set according to the target gloss (10%) of the solar panel 10 after installation, but the target value of the amount of reflection may also be set according to other criteria.

[0089] In the present embodiment, the gloss level is determined according to a target value for the amount of reflection, but the gloss level may be determined according to other target values ​​related to reflectance. For example, since the reflectance decreases as the transmittance increases (there is a correlation between the reflectance and the gloss level), the gloss level may be determined according to a target value for the transmittance.

[0090] In the reflectance calculation step S50, the first reflectance R1 and the like are calculated, but the reflectance calculated in the calculation step S50 is not limited to this embodiment and can be changed as appropriate depending on the information required to determine the gloss level. For example, the first reflectance R1 and the second reflectance R 11 When determining the glossiness without considering some of the reflectances that have a relatively small effect on the occurrence of light pollution, calculation of the glossiness may be omitted.

[0091] Furthermore, in this embodiment, the glossiness of the reflection-suppressing material 20 is adjusted by matte processing (fine unevenness), but the method for adjusting the glossiness is not particularly limited.

[0092] Furthermore, in this embodiment, one anti-reflection material 20 is attached to the surface material 14, but the number of anti-reflection materials 20 is not particularly limited. For example, multiple anti-reflection materials 20 with different refractive indices may be laminated on the surface material 14. Furthermore, the closer the multiple anti-reflection materials 20 are to the surface material 14, the smaller the difference in refractive index between the anti-reflection materials 20 and the surface material 14 may be. When designing multiple anti-reflection materials 20, the reflectance may be calculated in the calculation step S50, starting with the anti-reflection material 20 on the light-receiving surface side, and the amount of light reflected by the solar power generation panel 10 after installation may be calculated based on the reflectance. When designing multiple anti-reflection materials 20, it is preferable to determine the glossiness of the anti-reflection materials 20 according to the difference between the calculated reflection amount and a target reflection amount. [Explanation of symbols]

[0093] 10. Solar panels 14a surface 20 Reflection suppressing material

Claims

1. A method for designing an anti-reflection material that suppresses reflection of light, comprising: a setting step of setting a target value for the light reflectance of the solar panel after construction, on the surface of which the reflection-reducing material is attached; a first determination step in which a refractive index of the reflection-suppressing material is determined; a calculation step of calculating a light reflectance of the photovoltaic panel after application based on the refractive index of the anti-reflection material determined in the first determination step; a second determination step of determining the glossiness of the reflection-suppressing material based on the light reflectance calculated in the calculation step and the target value; Equipped with How to design anti-reflection materials.

2. In the calculation step, the reflectance of the light is calculated as The reflectance of light when light in the air is incident on the interface between the reflection-suppressing material and the air is calculated. A method for designing the reflection-suppressing material according to claim 1.

3. In the calculation step, the reflectance of the light is calculated as the reflectance of light when light in the reflection-suppressing material is incident on the interface between the reflection-suppressing material and the solar power generation panel; the reflectance of light when light in the reflection-suppressing material is incident on the interface between the reflection-suppressing material and air; is further calculated, The method for designing the reflection suppressing material according to claim 2.

4. The target value is The amount of light reflection is set according to the target gloss of the solar panel after installation. A method for designing the reflection-suppressing material according to claim 1.

5. In the second determination step, a gloss level of the reflection-suppressing material is determined according to a difference between the light reflectance calculated in the calculation step and the target value. A method for designing the reflection-suppressing material according to claim 1.

6. A reflection-suppressing material designed by the method for designing a reflection-suppressing material according to any one of claims 1 to 5.

7. The surface of the reflection-suppressing material has It is processed to diffuse light, The reflection-suppressing material according to claim 6.

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