JP6578643B2 - Daylighting sheet and installation method of daylighting sheet - Google Patents

Description

  The present invention relates to a daylighting sheet for daylighting and an installation method for installing the daylighting sheet.

  An example of a daylighting sheet laminated on a window glass and exhibiting a predetermined daylighting function is disclosed in Patent Document 1, for example. The daylighting sheet disclosed in Patent Document 1 is provided with a deflection layer in which two stripe regions having different refractive indexes are alternately arranged in the vertical direction. In this deflection layer, an interface having a refractive index difference is formed between two adjacent stripe-like regions. Reflecting and jumping up the light that should be direct light indoors at the interface with this refractive index difference, and using the captured light as illumination light while suppressing direct light from reaching the indoors Can do.

JP 2012-38626 A

  However, if the light incident on the daylighting sheet is bounced up at a position below the vertical direction, the bounced light reaches the face of a person indoors and feels dazzling. Therefore, the present inventor attempted to arrange a deflection layer having a function of splashing sunlight only in an upper region in the vertical direction and not to impart a deflection function to the lower region in the vertical direction. However, in this case, when a person indoors observes the daylighting sheet, there is an uncomfortable appearance between the upper area having the deflection function and the lower area having no deflection function. End up.

  The present invention has been made in consideration of the above points, and provides a daylighting sheet in which an uncomfortable appearance is alleviated by partially arranging a deflection layer, and an installation method for installing the daylighting sheet. With the goal.

The first daylighting sheet according to the present invention is parallel to the sheet surface along a uniaxial direction extending in the sheet surface of the daylighting sheet, a deflection layer that adjusts the traveling direction according to the incident angle and transmits light. And a light-transmitting layer arranged side by side with the deflection layer so as to form a seam extending in the other axis direction that is not parallel to the one- axis direction, and a light scattering function for light transmitted through the deflection layer and the light-transmitting layer. An external appearance adjustment layer, and the deflection layer is laminated on the external appearance adjustment layer so as to overlap a part of the external appearance adjustment layer, and the translucent layer is the deflection of the external appearance adjustment layer. The external appearance adjustment layer is laminated on the external appearance adjustment layer so as to overlap another part different from the layer and so that the external appearance adjustment layer overlaps the seam.

  In the first daylighting sheet according to the present invention, the external appearance adjusting layer may have a haze value measured in accordance with JISK7136 of 15% or more.

  In the first daylighting sheet according to the present invention, the external appearance adjusting layer may have a total light transmittance of 80% or more measured in accordance with JIS K7361.

  In the first daylighting sheet according to the present invention, the appearance adjustment layer may have a haze value measured in accordance with JISK7136 of 30% or more.

  In the first daylighting sheet according to the present invention, the appearance adjustment layer may have a haze value measured in accordance with JISK7136 of 50% or more.

  The second daylighting sheet according to the present invention has a deflection layer that adjusts the traveling direction according to the incident angle and transmits light, a haze value measured in accordance with JISK7136 is less than 15%, and JISK7361 An external appearance adjustment layer having a total light transmittance of 10% or more and less than 80% measured in conformity with the deflection layer laminated on the external appearance adjustment layer so as to overlap a part of the external appearance adjustment layer Has been.

  The first or second daylighting sheet according to the present invention further includes a light-transmitting layer arranged side by side with the deflection layer along a uniaxial direction extending in the sheet surface of the daylighting sheet. The appearance adjusting layer may be laminated on the appearance adjusting layer so as to overlap another part different from the deflection layer.

  In the first or second daylighting sheet according to the present invention, the deflection layer has a plurality of reflection function surfaces arranged in the uniaxial direction, and each reflection function surface is within the sheet surface of the daylighting sheet. You may extend along the direction which crosses a direction.

  In the first or second daylighting sheet according to the present invention, when the side on which the deflecting layer is arranged in the uniaxial direction is one side and the side on which the light transmitting layer is arranged is the other side, the reflection function The surface reflects at least a part of light incident from a direction inclined to one side with respect to the normal direction of the daylighting sheet and emits the light toward the direction inclined to one side with respect to the normal direction. Or, the angle formed with respect to the normal direction may be reduced so that the light is emitted in a direction inclined to the other side with respect to the normal direction.

  The installation method of the daylighting sheet | seat by this invention is equipped with the process of installing the daylighting sheet | seat which has one of the said characteristics so that the said deflection | deviation layer may be located in the upper direction in the up-down direction rather than the said translucent layer.

  In the installation step of the daylighting sheet installation method according to the present invention, the appearance adjustment layer of the daylighting sheet may be located indoors with respect to the deflection layer and the light transmission layer.

  According to the present invention, the deflection layer is laminated on a part of the appearance adjustment layer having a light scattering function or having a total light transmittance of 10% or more and less than 80%. It is possible to alleviate the discomfort on the appearance due to the partial arrangement in the appearance adjusting layer.

It is a perspective view which shows the window member containing a lighting sheet. Sectional drawing which shows the cross section of the window member shown in FIG. Sectional drawing which expands and shows the deflection | deviation layer of the lighting sheet shown in FIG. Sectional drawing for demonstrating the effect | action of the daylighting sheet | seat shown in FIG. Sectional drawing which shows the example which applied the lighting sheet shown in FIG. 2 to the laminated glass. The perspective view which shows the example which applied the lighting sheet shown in FIG. 2 to the roll screen.

  Hereinafter, an embodiment of the present invention will be described 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.

  Further, in this specification, the terms “film”, “sheet”, and “plate” are not distinguished from each other only based on the difference in designation. For example, “film” is a concept that includes a member that can be called a sheet or a plate, and therefore “lighting sheet” cannot be distinguished from only “lighting film” or “lighting plate”.

  Furthermore, as used in the present specification, the terms such as “parallel”, “orthogonal”, “identical”, etc. that specify the shape and geometric conditions as well as the degree thereof are not limited to the strict meaning. Interpretation should include the extent to which similar functions can be expected.

  Further, the “film surface (sheet surface, plate surface)” means the target film shape (sheet-like member) when the target film-like (sheet-like, plate-like) member is viewed as a whole and globally. , A plate-like member) means a surface coinciding with the planar direction. In the present embodiment described below, the sheet surface of the daylighting sheet 2 is parallel to the plate surface of the window base material 3.

  1-4 is a figure for demonstrating one Embodiment by this invention. Among these, FIG. 1 is a perspective view showing the window member 1 including the daylighting sheet 2.

The daylighting sheet 2 described below has a function of changing and taking in the optical path of external light. Typically, the daylighting sheet 2 is attached to a window base material 3 made of glass, for example, and changes the optical path of outside light to take in the light from the outdoor S1 to the indoor S2. In particular, the daylighting sheet 2 shown in FIG. Thereby, the captured external light can be used as illumination light while suppressing direct light from reaching the indoor S2. In addition, since external light is used as illumination light, energy necessary for illumination can be saved, and energy saving and CO ₂ reduction can be achieved.

  As shown in FIG. 1, the daylighting sheet 2 and the window base 3 are held by a window frame 4 and constitute a window member 1 of the building together with the window frame 4. The window member 1 here refers to a partition member that is installed at the opening of a building and partitions the outdoor S1 and the indoor S2. The window base material 3 to which the daylighting sheet 2 is attached is inserted into a groove 4 a provided in the window frame 4, and the peripheral edge thereof is covered with the window frame 4. As an example, the window base material 3 is a window base material known per se that has been conventionally used. Examples thereof include glass, acrylic resin, polyethylene terephthalate resin (PET), and polycarbonate resin (PC).

  FIG. 2 is a longitudinal section of the window member 1 shown in FIG. As shown in FIG. 2, the daylighting sheet 2 is attached to the window base material 3 via the bonding layer 5. The daylighting sheet 2 shown in FIG. 2 is laminated on the deflection layer 10, the deflection layer 10 and the light transmission layer 20 arranged side by side from one side to the other side in the uniaxial direction d1, and the deflection layer 10 and the light transmission layer 20. And an appearance adjustment layer 30. In the example shown in FIG. 1, the deflecting layer 10 and the light transmitting layer 20 face the outdoor S <b> 1 side and are bonded to the window base material 3 via the bonding layer 5. On the other hand, the appearance adjustment layer 30 faces the indoor S <b> 2 side and is bonded to the deflection layer 10 and the light transmitting layer 20 via the bonding layer 40.

  The deflection layer 10 has a function of adjusting the traveling direction according to the incident angle and transmitting the light L21 and L22. In the present embodiment, the light L21 incident on the daylighting sheet 2 is reflected from a direction greatly inclined to one side in the uniaxial direction d1 with respect to the normal direction nd of the daylighting sheet 2, and is reflected with respect to the normal direction nd. It is intended to emit light in a direction inclined to one side. On the other hand, the translucent layer 20 is intended to transmit the incident light L22 as it is without changing the traveling direction thereof. Therefore, even when the light L22 is incident on the daylighting sheet 2 from a direction greatly inclined to one side in the uniaxial direction d1 with respect to the normal direction nd of the daylighting sheet 2, when the light L22 is incident on the light transmitting layer 20, the traveling direction is changed. The light transmitting layer 20 is transmitted while being maintained. A specific configuration of the deflection layer 10 will be described later with reference to FIG.

  In particular, in the example shown in FIG. 2, one side in the uniaxial direction d1 coincides with the upper side in the vertical direction, and the other side in the uniaxial direction d1 coincides with the lower side in the vertical direction. Therefore, the light L21 incident on the deflection layer 10 from a direction greatly inclined upward in the vertical direction d1 with respect to the normal direction nd of the daylighting sheet 2 is reflected by the deflection layer 10 and travels upward. On the other hand, the light L22 incident on the light-transmitting layer 20 from the direction greatly inclined upward in the vertical direction d1 with respect to the normal direction nd of the daylighting sheet 2 proceeds downward while maintaining the traveling direction. According to such an arrangement, light incident on the translucent layer 20 located below the deflection layer 10 from the direction inclined upward in the vertical direction goes downward while maintaining the traveling direction. Further, it is possible to suppress the light bounced up by the daylighting sheet 2 from reaching the observer in the indoor S2 and feeling dazzling.

  However, when the deflecting layer 10 having the deflecting function and the translucent layer 20 that is not expected to exhibit the deflecting function are arranged in the uniaxial direction d1, when the observer in the indoor S2 observes the daylighting sheet 2, the appearance is improved. Will cause a sense of incongruity. Therefore, in the present embodiment, the appearance adjusting layer 30 having a scattering function is laminated on the deflection layer 10 and the light transmitting layer 20. According to the appearance adjustment layer 30 having the scattering function, the light transmitted through the deflection layer 10 and the light transmission layer 20 can be scattered and taken into the indoor S2. Thereby, when an observer in the indoor S2 observes the daylighting sheet 2, the user feels a sense of discomfort in appearance between the deflecting layer 10 having the deflecting function and the translucent layer 20 that is not expected to exhibit the deflecting function. This can be suppressed.

  The appearance adjustment layer 30 illustrated in FIG. 2 includes a main portion 31 and a diffusion component 32 that scatters light dispersed in the main portion 31. The diffusion component 32 referred to here is a component that can act on the light traveling in the appearance adjusting layer 30 to change the traveling direction of the light by reflection or refraction. Such a light scattering function of the diffusing component 32, that is, a light diffusing function can be obtained by, for example, forming the diffusing component 32 from a material having a refractive index different from that of the material forming the main portion 31, or reflecting the light. It can be applied by constructing the diffusing component 32 from a material that can act. Examples of the diffusing component 32 having a refractive index different from that of the material constituting the main portion 31 include resin beads, glass beads, metal compounds, porous substances containing gas, and simple bubbles.

  As described above, due to the diffusion component 32 dispersed in the main portion 31, the appearance adjustment layer 30 can exhibit a diffusion function of diffusing light. The degree of the diffusion function of the appearance adjustment layer 30 caused by the diffusion component 32 is set by appropriately setting the resin material forming the main portion 31, the thickness of the main portion 31, the configuration of the diffusion component 32, the concentration of the diffusion component 32, and the like. It can be adjusted within a very wide range. The degree of diffusion of the appearance adjustment layer 30 can be expressed using a haze value measured in accordance with JIS-K7136. As a result of intensive studies by the present inventors, the haze value of the appearance adjustment layer 30 measured in accordance with JIS-K7136 is preferably 15% or more, more preferably 30% or more, and 50 It was found that it is more preferable to be at least%. In this case, when an observer in the room S2 observes the daylighting sheet 2, an uncomfortable appearance is generated between the deflecting layer 10 having the deflecting function and the translucent layer 20 that is not expected to exhibit the deflecting function. This can be improved to an inconspicuous level. As an example, the haze value of the appearance adjusting layer 30 can be specified by measuring a sample obtained by peeling the appearance adjusting layer 30 from the bonding layer 40 in accordance with JIS-K7136.

  The reflection at the appearance adjustment layer 30 may be isotropic diffusion or anisotropic diffusion. When the appearance adjustment layer 30 has the above-described configuration, an isotropic diffusion function can be exhibited. As another example of the appearance adjustment layer 30 that exhibits the isotropic diffusion function, for example, a fine uneven surface formed by embossing on the surface 30a on the indoor S2 side of the resin appearance adjustment layer 30 may be used. Good. Alternatively, as another example, ground glass provided with fine irregularities on the surface 30a on the indoor S2 side of the glass appearance adjustment layer 30 may be used. Alternatively, as another example, a template glass provided with a pattern on the surface 30a on the indoor S2 side of the glass appearance adjustment layer 30 may be used. Alternatively, as yet another example, paper, especially shoji paper, can be mentioned.

  On the other hand, as an example of the appearance adjusting layer 30 that exhibits the anisotropic diffusion function, a fine uneven surface formed by hairline processing on the surface 30a on the indoor S2 side of the appearance adjusting layer 30 can be cited. Furthermore, a transparent optical element such as a fine prism, a lens, and a microlens is provided on the surface 30a on the indoor S2 side of the appearance adjustment layer 30, and due to these optical elements, the appearance adjustment layer 30 having an uneven surface. However, an isotropic diffuse reflection function or an anisotropic diffuse reflection function may be exhibited.

  In the daylighting sheet 2 according to the present embodiment, the appearance adjustment layer 30 has a total light transmittance of 80% or more measured in accordance with JISK7361. When the total light transmittance is 80% or more, the light taken into the indoor S2 by the daylighting sheet 2 can be efficiently used as illumination light for the indoor S2, which is excellent in terms of practicality as a daylighting sheet.

  Next, a specific configuration of the deflection layer 10 described above will be described with reference to FIG. FIG. 3 is an enlarged cross-sectional view of the deflection layer 10. As shown in FIG. 3, the deflection layer 10 includes a plurality of first regions 11 and a plurality of second regions 12 that are alternately and repeatedly arranged along the uniaxial direction d1. The first region 11 and the second region 12 extend in the other axial direction d2 (see FIG. 1) parallel to the sheet surface of the daylighting sheet 2 and not parallel to the uniaxial direction d1. In the illustrated example, the other axial direction d2 is orthogonal to the uniaxial direction d1. That is, the other-axis direction d2 that is the longitudinal direction of the first region 11 and the second region 12 is parallel to the horizontal direction.

  The deflection layer 10 further includes a sheet-like land portion 13 stacked on the first region 11 and the second region 12. The land portion 13 is formed integrally with the second region 12, and forms a main body portion 14 together with the second region 12. In other words, the deflection layer 10 has a main body portion 14 formed by arranging a plurality of grooves 14a having a longitudinal direction parallel to the other-axis direction d2 in the uniaxial direction d1, and each of the plurality of grooves 14a in the main body portion 14 has a plurality of grooves 14a. The second area 12 is arranged. A portion of the main body portion 14 between the adjacent grooves 14 a defines the first region 11.

  In the present embodiment, the resin material forming the first region 11 to the main body portion 14 is made of a material having a smaller refractive index than the resin material forming the second region 12. For this reason, a reflective functional surface 15 having a refractive index difference is formed at the boundary between the first region 11 and the second region 12. As described above, the plurality of first regions 11 and the plurality of second regions 12 are alternately and repeatedly arranged in the uniaxial direction d1. Therefore, the plurality of reflection functional surfaces 15 are arranged along the uniaxial direction d1. The reflective functional surface 15 as used in this specification refers to a surface that is expected to exert a total reflection effect on light that is intended to be taken into the daylighting sheet 2. Typically, the reflecting functional surface 15 reflects at least a part of the light L31 and L32 incident from a direction inclined to one side with respect to the normal direction nd of the daylighting sheet 2, and the normal direction nd. The light is emitted toward the direction inclined to one side, or the angle formed with respect to the normal direction nd is reduced so that the light is emitted toward the direction inclined to the other side with respect to the normal direction nd. It is supposed to let you. In the present embodiment, the reflecting functional surface 15 is arranged in the same direction as the vertical direction, and sunlight L31 and L32 falling from above in the vertical direction (above the paper surface) is intended to be reflected by the reflecting functional surface 15. Yes. Therefore, in the present embodiment, the boundary between the first region 11 and the second region 12 adjacent to the first region 11 on the lower side in the vertical direction (the lower side in the drawing) forms the reflection function surface 15. As an example, the pitch of the reflective functional surfaces 15, that is, the interval between adjacent reflective functional surfaces 15 is set to about 20 μm to 1000 μm.

  According to the reflection function surface 15 shown in FIG. 3, the light L31 and L32 having large incident angles θ1 and θ2 to the deflection layer 10 can be reflected by the reflection function surface 15 and directed toward the ceiling of the indoor S2. On the other hand, the light L33 having a small incident angle θ3 to the deflection layer 10 can be transmitted while maintaining the traveling direction. That is, according to the reflection function surface 15, the traveling direction can be adjusted according to the incident angles θ1 to θ3 and the light L31 to L33 can be transmitted, so that the light L31 to the room S1 is prevented from reaching the direct light. L33 can be taken in effectively. The incident angles θ1 to θ3 to the deflection layer 10 refer to angles formed by the light beams L31 to L33 incident on the deflection layer 10 with respect to the normal direction nd to the deflection layer 10.

  In particular, the reflection function surface 15 shown in FIG. 3 is bent so as to protrude downward in the vertical direction (downward in the drawing). That is, the light incident side portion 15 a of the reflective functional surface 15 is inclined so that the angle formed with respect to the normal direction nd to the deflection layer 10 is larger than the light outgoing side portion 15 b of the reflective functional surface 15. Yes. According to such a form, the light L31 having a large incident angle θ1 to the daylighting sheet 2 can be reflected by the light output side portion 15b and directed toward the indoor ceiling. However, when the incident angle θ2 at which the light L34 enters the first dimming control panel 20 becomes considerably large, the incident angle to the light-emitting side portion 15b is smaller than the total reflection critical angle of the light-emitting side portion 15b. As a result, the light exit side portion 15b is transmitted. Therefore, by inclining the light incident side portion 15a of the reflection function surface 15 to be larger than the light emission side portion 15b, all the light L32 having a considerably large incident angle θ2 to the daylighting sheet 2 is received by the light incident side portion 15a. Can be reflected. Therefore, it contributes to exhibiting an excellent anti-glare function by inclining the light incident side portion 15a of the reflective functional surface 15 to be larger than the light output side portion 15b.

  The first region 11 and the land portion 13 can be integrally formed using the same material. As a material forming the first region 11 and the land portion 13, for example, a resin material, in particular, an ionizing radiation curable resin material that is cured by irradiation with ionizing radiation can be used. Examples of the ionizing radiation curable resin include an ultraviolet curable resin, an electron beam curable resin, a visible light curable resin, and a near infrared curable resin. On the other hand, as the second region 12 made of a material having a refractive index lower than that of the first region 11, for example, a curable material such as urethane acrylate having a characteristic of being cured by ionizing radiation can be used.

  Alternatively, the second region 12 may be made of air. An example in which the second region 12 is made of air is described in Japanese Patent Application Laid-Open No. 2011-227120 and Japanese Patent Application Publication No. 2013-514549, and detailed description thereof is omitted here.

  Returning to FIG. 2, the light transmitting layer 20 is adjacent to the deflection layer 10 including the first region 11 and the second region 12 from the other side in the uniaxial direction d1. As described above, the translucent layer 20 allows light incident from an upwardly inclined direction in the vertical direction d1 to be kept downward while maintaining the traveling direction so as to exhibit an anti-glare function for an observer from the indoor S2. Lights out. As a material for forming the light transmissive layer 20, a material excellent in light transmittance, for example, a polyester resin such as polyethylene terephthalate (PET) can be used. Alternatively, the light transmissive layer 20 may be formed of a void, that is, an air layer.

  Further, the deflection layer 10 and the light transmitting layer 20 are connected to the appearance adjusting layer 30 through the bonding layer 40. That is, the deflection layer 10 is laminated on a part of the appearance adjustment layer 30, and the light transmitting layer 20 is laminated on the remaining part of the appearance adjustment layer 30. In particular, in the example shown in FIG. 2, the deflecting layer 10 and the light transmitting layer 20 adjacent in the uniaxial direction d1 are connected to each other, and a seam T extending in the other axial direction d2 is formed. Since the seam T is also located at the position overlapping the appearance adjustment layer 30, the seam T can be made inconspicuous for an observer in the indoor S2.

  Further, the light incident side surfaces of the deflection layer 10 and the light transmitting layer 20 are bonded to the window base material 3 via the bonding layer 5. As this joining layer 5, the layer which consists of adhesives, such as an acrylic type, a urethane type, a silicone type, and a rubber type, can be used, for example. The thickness of the bonding layer 55 is, for example, about 5 μm to 100 μm. In addition, the material forming the bonding layer 40 may be the same as the material forming the bonding layer 5.

  Next, the installation method of the lighting sheet 2 affixed on the window base material 3 is demonstrated. In the daylighting sheet 2 attached to the window base material 3, the deflection layer 10 is positioned above the translucent layer 20 in the vertical direction, and the appearance adjustment layer 30 is indoors than the deflection layer 10 and the translucent layer 20. It is installed so as to be located on the S2 side. Thereby, the window base material 3 and the daylighting sheet 2 are installed in the opening of the building so as to partition the outdoor S1 and the indoor S2, and the window member 1 is configured.

  Next, the operation of the window member 1 and the daylighting sheet 2 of the present embodiment described above will be described with reference to FIG. FIG. 4 is a cross-sectional view for explaining the operation of the daylighting sheet 2.

  In summer, especially in the daytime, the sun's altitude is relatively high. As described above, the sheet surface of the daylighting sheet 2 is installed parallel to the vertical direction, and the normal direction nd to the daylighting sheet 2 is directed in the horizontal direction. For this reason, sunlight L41 and L42 enter into the daylighting sheet 2 from the direction where the incident angle θ to the daylighting sheet 2 is relatively large. As shown in FIG. 2, among the sunlight L41 and L42 incident on the daylighting sheet 2, the sunlight L41 incident on the deflection layer 10 travels in the first region 11 and is totally reflected by the reflection function surface 15. The totally reflected light L41 is changed so that the traveling direction is directed upward, and proceeds toward the appearance adjustment layer 30. On the other hand, the sunlight L42 incident on the light transmissive layer 20 passes through the light transmissive layer 20 while maintaining the traveling direction. Sunlight L41 and L42 transmitted through the deflecting layer 10 or the light transmitting layer 20 are diffused in the appearance adjusting layer 30 and taken into the indoor S2.

  On the other hand, the altitude of the sun is relatively low in winter and in the morning and evening hours. For this reason, sunlight L43 and L44 enter into the daylighting sheet 2 from the direction where the incident angle θ to the daylighting sheet 2 is relatively small. As shown in FIG. 2, among the sunlight L43 and L44 incident on the daylighting sheet 2, most of the sunlight L43 incident on the deflection layer 10 is maintained in the traveling direction without being incident on the reflection function surface 15. It passes through the deflection layer 10. On the other hand, the sunlight L44 incident on the translucent layer 20 passes through the translucent layer 20 while maintaining the traveling direction. Sunlight L43 and L44 transmitted through the deflecting layer 10 or the light transmitting layer 20 is diffused in the appearance adjusting layer 30 and taken into the indoor S2.

  When an observer in the indoor S2 observes such a daylighting sheet 2, the appearance adjustment layer 30 is observed. As described above, the light L41 to L44 transmitted from the outdoor S1 through the deflecting layer 10 or the light transmitting layer 20 and entering the appearance adjusting layer 30 is diffused in the appearance adjusting layer 30 and taken into the indoor S2. Therefore, when an observer in the indoor S2 observes the daylighting sheet 2, a discomfort in appearance appears between the deflection layer 10 having the deflection function and the light-transmitting layer 20 that is not expected to exhibit the deflection function. Can be suppressed.

  As described above, according to the present embodiment, the deflection layer 10 that transmits the light L41 and L43 by adjusting the traveling direction according to the incident angle θ, and the appearance adjustment layer 30 having the light scattering function are provided. The deflection layer 10 is laminated on the appearance adjustment layer 30 so as to overlap a part of the appearance adjustment layer 30. According to such a form, the light L41 that passes through the deflection layer 10 and the light L42 that does not pass through the deflection layer 10 and passes through the daylighting sheet 2 are diffused by the appearance adjustment layer 30 and taken into the indoor S2. It becomes possible. Thereby, when an observer in the room S2 observes the daylighting sheet 2, the appearance adjustment layer 30 effectively relieves the appearance discomfort due to the partial arrangement of the deflection layer 10 in the daylighting sheet 2. It becomes possible to do.

  In addition, according to the present embodiment, the appearance adjustment layer 30 is located closer to the indoor S2 side than the deflection layer 10. In this case, since the appearance adjustment layer 30 having a scattering function is observed when an observer in the indoor S2 observes the daylighting sheet 2, the appearance due to partial arrangement of the deflection layer 10 in the daylighting sheet 2 is improved. Can be alleviated by the appearance adjustment layer 30.

  Further, according to the present embodiment, the light transmitting layer 20 is further provided with the light transmitting layer 20 arranged side by side with the deflection layer 10 along the uniaxial direction d1 extending in the sheet surface of the daylighting sheet 2, and the light transmitting layer 20 is the appearance adjusting layer. 30 is laminated on the appearance adjusting layer 30 so as to overlap another part different from the deflection layer 10. According to such a form, when the light incident on the daylighting sheet 2 from the directions L41 and L42 whose traveling direction should be changed in the deflection layer 10 is incident on the translucent layer 20, the traveling direction is maintained. Go down. For this reason, a different deflection function can be exhibited between the deflection layer 10 and the translucent layer 20 with respect to the light L41 and L42 incident on the daylighting sheet 2 from a certain direction. In particular, in the present embodiment, the translucent layer 20 is connected to the deflection layer 10 from below in the vertical direction, and light L41 incident on the deflection layer 10 from a direction inclined upward in the vertical direction is applied to the deflection layer 10. It is intended to change the direction of travel. In this case, the light L42 incident on the light transmitting layer 20 from the direction inclined upward in the vertical direction travels downward while maintaining the traveling direction. That is, since the light L42 incident on the light transmitting layer 20 located below the deflection layer 10 from the direction inclined upward in the vertical direction is directed downward while maintaining the traveling direction, it is in the indoor S2. It can be suppressed that the light bounced up by the daylighting sheet 2 reaches the observer and feels dazzling.

  Further, the installation method of the daylighting sheet 2 according to the present embodiment includes a step of installing the daylighting sheet 2 described above so that the deflection layer 10 is located above the light transmission layer 20 in the vertical direction. That is, in the window member 1 of the present embodiment, the deflecting layer 10 is positioned above the translucent layer 20 in the vertical direction. According to such a configuration, as described above, the light L42 incident on the light transmitting layer 20 positioned below the deflection layer 10 from the direction inclined upward in the vertical direction maintains the traveling direction. Since it goes downward, it can suppress that the light bounced up by the daylighting sheet | seat 2 reaches | attains the observer who is indoor S2, and is dazzled.

  In particular, in the installation step, the appearance adjustment layer 30 of the daylighting sheet 2 is positioned closer to the indoor S2 side than the deflection layer 10 and the light transmission layer 20. In this case, since the appearance adjustment layer 30 having a scattering function is observed when an observer in the indoor S2 observes the daylighting sheet 2, the deflecting layer 10 having a deflecting function and a light-transmitting layer that is not expected to exhibit the deflecting function 20, it is possible to suppress the appearance of an uncomfortable appearance.

  Note that various modifications can be made to the above-described embodiment. Hereinafter, an example of modification will be described with reference to the drawings. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding parts in the above embodiment are used for the parts that can be configured in the same manner as in the above embodiment. A duplicate description is omitted.

  In the above-described embodiment, as shown in FIG. 2, the appearance adjustment layer 30 includes the main part 31 and the diffusion component 32 and exhibits the scattering function. However, the embodiment is not limited thereto. For example, the appearance adjustment layer 30 is a layer having a haze value measured in accordance with JISK7136 of less than 15% and a total light transmittance measured in accordance with JISK7361 of 10% or more and less than 80%. There may be. Examples of such an appearance adjustment layer 30 include a transparent resin sheet in which ink having a function of absorbing visible light is printed in a dot pattern, a cloth having a stitch represented by a lace curtain, or a screen door.

  When the total light transmittance is 10% or more, a function that can withstand the use of using the light taken into the indoor S2 by the daylighting sheet 2 as the illumination light of the indoor S2 can be exhibited. On the other hand, when the total light transmittance is less than 80%, the appearance adjusting layer 30 partially absorbs the light transmitted through the deflection layer 10 and the light transmitted through the daylighting sheet 2 without entering the deflection layer 10. Can be taken into the indoor S2. Thereby, when an observer in the room S2 observes the daylighting sheet 2, the appearance adjustment layer 30 can relieve the appearance discomfort due to the partial arrangement of the deflection layer 10 in the daylighting sheet 2. It becomes possible.

  Further, in the above-described embodiment, the example in which the light transmitting layer 20 intends to transmit the incident light as it is is shown. However, the present invention is not limited to this. The light transmitting layer 20 may be a layer having a deflecting function different from that of the deflecting layer 10 as long as it is configured to transmit light incident from the outdoor S1 side to the indoor S2 side.

  Moreover, in embodiment mentioned above, although the window member 1 showed the example which has the single window base material 3 and the daylighting sheet 2 laminated | stacked on this window base material 3, it is not restricted to this. . FIG. 5 shows another example of the window member 1. In the example shown in FIG. 5, the window member 1 is configured as a laminated glass. The window member 1 shown in FIG. 5 further includes a further window base material 6 disposed to face the window base material 3, and the daylighting sheet 2 is disposed between the pair of window base materials 3 and 6. . The daylighting sheet 2 is bonded to the window base materials 3 and 6 via the bonding layer 5. Even in the form shown in FIG. 5, the same operational effects as those of the above-described embodiment can be obtained.

  Next, still another application example of the daylighting sheet 2 will be described with reference to FIG. FIG. 6 is a diagram illustrating an example in which the daylighting sheet 2 is applied to the roll screen 7. A roll screen 7 described with reference to FIG. 6 is attached to a frame 9 surrounding an opening formed in a building. As shown in FIG. 6, the roll screen 7 includes a daylighting sheet 2 attached to a cloth 8a, and winding means 8b that winds the daylighting sheet 2 into a roll. The winding means 8b is configured to be able to wind and unwind the cloth 8a to which the daylighting sheet 2 is attached. In a state where the cloth 8a with the daylighting sheet 2 attached is unwound from the winding means 8b, the uniaxial direction d1 that is the direction in which the deflection layer 10 and the light transmitting layer 20 are arranged is aligned with the vertical direction. Thus, the opening surrounded by the frame 9 is covered. Even in the form shown in FIG. 6, in the state where the cloth 8 a to which the daylighting sheet 2 is attached is unwound from the winding means 8 b, the same operational effects as those of the above-described embodiment can be obtained.

  In addition, although the some modification with respect to one Embodiment mentioned above was demonstrated above, naturally, it is also possible to apply combining several modifications suitably.

DESCRIPTION OF SYMBOLS 1 Window member 2 Daylighting sheet 3 Window material 7 Roll screen 10 Deflection layer 11 1st area | region 12 2nd area | region 15 Reflective function surface 20 Translucent layer 30 Appearance adjustment layer 31 Main part 32 Diffusion component 40 Joining layer d1 Uniaxial direction

Claims (9)

A daylighting sheet,
A deflection layer that transmits light by adjusting the traveling direction according to the incident angle;
A transparent layer arranged side by side with the deflection layer so as to form a seam extending along the uniaxial direction extending in the sheet surface of the daylighting sheet and extending in the other axial direction parallel to the sheet surface and non-parallel to the uniaxial direction. The light layer,
An appearance adjusting layer having a light scattering function for light transmitted through the deflecting layer and the light transmitting layer;
With
The deflection layer is laminated on the appearance adjustment layer so as to overlap a part of the appearance adjustment layer,
The translucent layer is laminated on the appearance adjustment layer so as to overlap another part of the appearance adjustment layer different from the deflection layer, and so that the appearance adjustment layer overlaps the seam. A daylighting sheet.   2. The daylighting sheet according to claim 1, wherein the appearance adjusting layer has a haze value measured in accordance with JISK7136 of 15% or more.   The daylighting sheet according to claim 2, wherein the appearance adjusting layer has a total light transmittance of 80% or more measured in accordance with JISK7361.   The daylighting sheet according to claim 3, wherein the appearance adjusting layer has a haze value measured in accordance with JISK7136 of 30% or more.   5. The daylighting sheet according to claim 4, wherein the appearance adjusting layer has a haze value measured in accordance with JISK7136 of 50% or more. A deflection layer that transmits light by adjusting the traveling direction according to the incident angle;
An appearance adjusting layer having a haze value measured in accordance with JISK7136 of less than 15% and a total light transmittance measured in accordance with JISK7361 of 10% or more and less than 80%;
The daylighting sheet according to claim 1, comprising: The deflection layer has a plurality of reflective functional surfaces arranged in the uniaxial direction,
7. The daylighting sheet according to claim 1, wherein each of the reflection functional surfaces extends along a direction intersecting the uniaxial direction within a sheet surface of the daylighting sheet.   An installation method of a daylighting sheet, comprising a step of installing the daylighting sheet according to claim 1 so that the deflection layer is positioned above the light transmission layer in the vertical direction.   9. The daylighting sheet installation method according to claim 8, wherein, in the step of installing, the appearance adjustment layer of the daylighting sheet is positioned more indoors than the deflection layer and the light transmission layer.

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