JP6057199B2 - Daylighting film, daylighting tool, and method for manufacturing daylighting film - Google Patents

Daylighting film, daylighting tool, and method for manufacturing daylighting film Download PDF

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JP6057199B2
JP6057199B2 JP2016072123A JP2016072123A JP6057199B2 JP 6057199 B2 JP6057199 B2 JP 6057199B2 JP 2016072123 A JP2016072123 A JP 2016072123A JP 2016072123 A JP2016072123 A JP 2016072123A JP 6057199 B2 JP6057199 B2 JP 6057199B2
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filling
refractive index
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JP2016157130A (en
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木 康 弘 大
木 康 弘 大
塚 聖 三
塚 聖 三
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Dai Nippon Printing Co Ltd
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Description

本発明は、採光フィルム、採光具および採光フィルムの製造方法に関する。   The present invention relates to a daylighting film, a daylighting tool, and a method for manufacturing a daylighting film.

屋内の照明の照明強度を弱めて二酸化炭素の排出量の削減と消費電力の低減を図る一環として、窓に入射された外光を屋内の天井方向に偏向させて採光効率を向上させる光制御シートが提案されている。例えば、特許文献1には、透過部と遮光部を交互に並べた構造の光制御シートを例えば窓ガラスに貼り付けて、太陽光の入射角度の違いにより、夏季は屋内への太陽光の取り込みを減少させ、冬季は太陽光の取り込みを増加させる技術が開示されている。   Light control sheet that improves daylighting efficiency by deflecting outside light incident on the window toward the indoor ceiling as part of efforts to reduce carbon dioxide emissions and reduce power consumption by reducing the intensity of indoor lighting Has been proposed. For example, in Patent Document 1, a light control sheet having a structure in which transmissive portions and light-shielding portions are alternately arranged is attached to, for example, a window glass, and sunlight is taken in indoors in summer due to a difference in the incident angle of sunlight. Have been disclosed, and the technology for increasing the uptake of sunlight in winter is disclosed.

特開2010−259406号公報JP 2010-259406 A

上述した特許文献1の光制御シートや、その他の採光を目的とした従来の採光フィルムでは、複数の溝を有するベース部と、これら溝内に充填される複数の充填部とを備えており、ベース部と充填部との屈折率差を利用して、採光フィルムに入射された外光を室内の天井や壁方向に導光するようにしている。溝内に充填される充填材料としては、電子線や熱により硬化する硬化性樹脂が用いられることが多い。   The above-described light control sheet of Patent Document 1 and other conventional daylighting films for the purpose of daylighting include a base portion having a plurality of grooves and a plurality of filling portions filled in these grooves, By utilizing the refractive index difference between the base portion and the filling portion, the external light incident on the daylighting film is guided toward the indoor ceiling or wall. As the filling material filled in the groove, a curable resin that is hardened by an electron beam or heat is often used.

しかしながら、硬化性樹脂は、溝内で硬化する際に収縮することが多く、また充填時の工程上の問題により、溝の開口周辺に空洞部が形成されてしまう。この空洞部を残したままにしておくと、空洞部内の空気と溝内の充填部との間の屈折率差により、入射光が空洞部と充填部との界面で反射され、採光フィルム内に入射される光の割合が減ってしまうおそれがある。また、空洞部と充填部の屈折率差により入射光の屈折角度が変化してしまい、意図せぬ方向に光が進行するおそれもある。   However, the curable resin often shrinks when cured in the groove, and a cavity is formed around the opening of the groove due to a problem in the process during filling. If this cavity is left as it is, incident light is reflected at the interface between the cavity and the filling portion due to the difference in refractive index between the air in the cavity and the filling portion in the groove. There is a possibility that the ratio of incident light may be reduced. In addition, the refractive angle of incident light changes due to the difference in refractive index between the cavity and the filling portion, and the light may travel in an unintended direction.

本発明は、上述した課題を解決するためになされたものであり、その目的は、採光効率を向上可能な採光フィルム、採光具および採光フィルムの製造方法を提供することにある。   The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a daylighting film, a daylighting tool, and a daylighting film manufacturing method capable of improving daylighting efficiency.

上記の課題を解決するために、本発明の一態様では、一方の面に沿って離隔して配置される複数の溝を有するベース部と、
前記ベース部とは異なる屈折率を持つ充填材料を前記複数の溝内に充填した複数の充填部と、
前記複数の充填部の前記一方の面側の端面形状により形成される1以上の凹部に所定の充填材料を充填した空洞充填部と、を備える採光フィルムが提供される。
In order to solve the above-described problem, in one aspect of the present invention, a base portion having a plurality of grooves that are spaced apart along one surface;
A plurality of filling portions filled in the plurality of grooves with a filling material having a refractive index different from that of the base portion;
There is provided a daylighting film including a cavity filling portion in which one or more recesses formed by the end surface shape on the one surface side of the plurality of filling portions are filled with a predetermined filling material.

前記空洞充填部に充填される前記所定の充填材料は、前記複数の充填部と同じ屈折率を持っていてもよい。   The predetermined filling material filled in the cavity filling portion may have the same refractive index as the plurality of filling portions.

前記空洞充填部に充填される前記所定の充填材料は、前記複数の充填部に充填される材料であってもよい。   The predetermined filling material filled in the cavity filling portion may be a material filled in the plurality of filling portions.

前記空洞充填部に充填される前記所定の充填材料は、前記ベース部の形成材料であってもよい。   The predetermined filling material filled in the cavity filling portion may be a material for forming the base portion.

前記ベース部と前記複数の充填部との屈折率差は、0.1以上であってもよい。   The difference in refractive index between the base portion and the plurality of filling portions may be 0.1 or more.

前記空洞充填部は、前記1以上の凹部の開口面の高さ以上の高さになるように前記1以上の凹部内に充填されてもよい。   The cavity filling portion may be filled in the one or more recesses so as to have a height equal to or higher than a height of an opening surface of the one or more recesses.

本発明の他の一態様は、上述した採光フィルムにおける前記空洞充填部が配置される前記一方の面側に接着層を介して配置される透明基材と、
前記接着層の前記空洞充填部とは反対側の面に接着層を介して配置される透明基材と、を備える採光具でもよい。
Another aspect of the present invention is a transparent base material disposed via an adhesive layer on the one surface side where the cavity filling portion in the daylighting film described above is disposed,
A lighting tool may be provided that includes a transparent base material disposed on the surface of the adhesive layer opposite to the cavity filling portion via the adhesive layer.

本発明の他の一態様は、一方の面に沿って離隔して配置される複数の溝を有するベース部とは異なる屈折率を持つ充填材料を前記複数の溝内に充填した複数の充填部の前記一方の面側の端面形状により形成される1以上の凹部の周囲及び凹部内へ所定の充填材料を塗布する工程と、
前記ベース部の前記一方の面側の余分な前記所定の充填材料を掻き取る工程と、
前記1以上の凹部に充填された前記所定の充填材料を硬化させる工程を、凹部が埋まるまで少なくとも1回以上実施し前記凹部へ充填材料を充填する工程と、を備える採光フィルムの製造方法でもよい。
According to another aspect of the present invention, a plurality of filling portions are formed by filling a filling material having a refractive index different from that of a base portion having a plurality of grooves spaced apart along one surface into the plurality of grooves. Applying a predetermined filling material around and within one or more recesses formed by the end face shape on the one surface side of
Scraping off the excess predetermined filling material on the one surface side of the base portion;
The step of curing the predetermined filling material filled in the one or more recesses may be performed at least once until the recesses are filled and the filling material is filled in the recesses. .

本発明によれば、ベース部内に離隔して配置される複数の充填部に凹部が形成されたとしても、採光効率を向上できる。   According to the present invention, even if the concave portions are formed in the plurality of filling portions that are spaced apart from each other in the base portion, the daylighting efficiency can be improved.

一実施形態による採光フィルムの断面構造を示す図。The figure which shows the cross-section of the daylighting film by one Embodiment. 図1の一変形例の断面構造を示す図。The figure which shows the cross-section of the modification of FIG. 図1および図2とは異なる断面構造を示す図。The figure which shows the cross-sectional structure different from FIG. 1 and FIG. 図1〜図3とは異なる断面構造を示す図。The figure which shows the cross-sectional structure different from FIGS. 一実施形態による合わせガラスの断面構造を示す図。The figure which shows the cross-section of the laminated glass by one Embodiment. 本実施形態の製造工程の一例を示す工程フロー図。The process flowchart which shows an example of the manufacturing process of this embodiment.

以下、本発明の実施の形態について、詳細に説明する。なお、本件明細書に添付する図面においては、図示と理解のしやすさの便宜上、縮尺および縦横の寸法比等を、実物のそれらから適宜変更したり、誇張してある。   Hereinafter, embodiments of the present invention will be described in detail. In the drawings attached to the present specification, for convenience of illustration and understanding, the scale, the vertical / horizontal dimensional ratio, and the like are appropriately changed or exaggerated from those of the actual ones.

図1は一実施形態による採光フィルムの断面構造を示す図である。図1の採光フィルム1は、例えば窓や採光具に積層して用いられるか、あるいは、窓や採光具の内部に組み込まれて用いられる。   FIG. 1 is a diagram showing a cross-sectional structure of a daylighting film according to an embodiment. The daylighting film 1 of FIG. 1 is used by being laminated on, for example, a window or a daylighting tool, or incorporated in a window or daylighting tool.

図1に示すように、一実施形態による採光フィルム1は、一方の面1aに沿って離隔して配置される複数の溝2を有するベース部3と、ベース部3とは異なる屈折率を持つ充填材料を複数の溝2内に充填した複数の充填部4とを備えている。   As shown in FIG. 1, a daylighting film 1 according to an embodiment has a base portion 3 having a plurality of grooves 2 that are spaced apart along one surface 1 a and a refractive index different from that of the base portion 3. A plurality of filling portions 4 filled with a filling material in the plurality of grooves 2 are provided.

例えば、ベース部3は、複数の充填部4よりも大きい屈折率を持っている。これにより、外部からベース部3に入射された光は、充填部4との界面で反射されて、斜め上方に跳ね上げられる。ベース部3の内部を進行する光を充填部4との界面で反射させるには、ベース部3と複数の充填部4との屈折率差が0.1以上であることが望ましい。例えば、ベース部3の屈折率は約1.6前後、充填部4の屈折率は約1.4前後に設定される。   For example, the base portion 3 has a higher refractive index than the plurality of filling portions 4. Thereby, the light incident on the base portion 3 from the outside is reflected at the interface with the filling portion 4 and is bounced upward obliquely. In order to reflect the light traveling inside the base portion 3 at the interface with the filling portion 4, it is desirable that the difference in refractive index between the base portion 3 and the plurality of filling portions 4 is 0.1 or more. For example, the refractive index of the base portion 3 is set to about 1.6, and the refractive index of the filling portion 4 is set to about 1.4.

複数の充填部4の一方の面1a側には、各充填部4の端面形状による1以上の凹部4aが形成されている。ここで、凹部4aとは、充填部4の一方の面1a側に形成される凹みである。凹部4aは、充填時に掻き取り過ぎてしまうことによって形成されると共に、各充填部4に充填される充填材料が硬化する際に硬化収縮が起きることで必然的に形成されるものである。凹部4aをそのまま残しておくと、充填部4の一方の面1a側に別の層を形成した際に凹部4a内の空気が外へ排出されずそのまま残ることにより、凹部4aと充填部4との界面に大きな屈折率差が生じてしまう。この屈折率差により、外部から凹部4aに入射された光の一部は、充填部4との界面で反射され、採光フィルム1の内部に入り込む量が減ってしまう。なお、凹部4aは、すべての充填部4に形成されるとは限らず、製造ばらつき等により一部の充填部4のみに形成される場合もありうる。   On one surface 1a side of the plurality of filling portions 4, one or more recesses 4a are formed according to the end face shape of each filling portion 4. Here, the recess 4 a is a recess formed on the one surface 1 a side of the filling portion 4. The concave portion 4a is formed by being scraped too much at the time of filling, and is inevitably formed by curing shrinkage when the filling material filled in each filling portion 4 is cured. If the recess 4a is left as it is, when another layer is formed on the one surface 1a side of the filling portion 4, the air in the recess 4a remains without being discharged to the outside, so that the recess 4a and the filling portion 4 A large difference in refractive index occurs at the interface. Due to this refractive index difference, a part of the light incident on the concave portion 4 a from the outside is reflected at the interface with the filling portion 4, and the amount entering the inside of the daylighting film 1 is reduced. In addition, the recessed part 4a is not necessarily formed in all the filling parts 4, and may be formed only in the one part filling part 4 by manufacturing dispersion | variation etc.

そこで、本実施形態による採光フィルム1は、この凹部4a内に所定の充填材料を充填した空洞充填部5をさらに備えている。空洞充填部5は、凹部4aの開口面の高さ以上の高さになるように凹部4a内に充填されている。すなわち、本実施形態では、凹部4aを空洞充填部5で充填することで、ベース部3の一方の面1aには、凹部4aによるくぼみが完全になくなるようにしている。   Therefore, the daylighting film 1 according to the present embodiment further includes a cavity filling portion 5 in which a predetermined filling material is filled in the recess 4a. The cavity filling portion 5 is filled in the recess 4a so as to have a height equal to or higher than the height of the opening surface of the recess 4a. In other words, in this embodiment, the recess 4a is filled with the cavity filling portion 5 so that the recesses due to the recess 4a are completely eliminated from the one surface 1a of the base portion 3.

複数の溝2内に充填材料を充填して複数の充填部4を形成したときに、各充填部4内に凹部4aが形成される理由は、充填材料が硬化する際に収縮するためと、製造上の都合により充填材料が凹部4a内に適切に充填されない場合がありうるためである。   When filling the filling material into the plurality of grooves 2 to form the plurality of filling parts 4, the reason why the recesses 4a are formed in the filling parts 4 is that the filling material shrinks when cured, This is because the filling material may not be properly filled in the recess 4a due to manufacturing reasons.

空洞充填部5の頂部は、ベース部3の一方の面1aと面一になるか、あるいは、一方の面1aから突き出すように形成されている。後述するように、空洞充填部5を形成する際には、ベース部3の一方の面1a側に、流動性のある硬化性樹脂を塗布してから硬化させるため、凹部4aの内部だけでなく、図2に示すようにベース部3の一方の面1aのほぼ全域に硬化樹脂層が形成される場合もありうる。図2の場合であっても、硬化樹脂層の一部は凹部4a内に充填され、上述した空洞充填部5が形成される。   The top of the cavity filling portion 5 is formed so as to be flush with one surface 1a of the base portion 3 or project from one surface 1a. As will be described later, when the cavity filling portion 5 is formed, a fluid curable resin is applied to the one surface 1a side of the base portion 3 and then cured. As shown in FIG. 2, a cured resin layer may be formed on almost the entire area of one surface 1a of the base portion 3. Even in the case of FIG. 2, a part of the cured resin layer is filled in the recess 4 a to form the above-described cavity filling portion 5.

図1と図2の空洞充填部5は、充填部4と同じ材料で形成されている。これにより、空洞充填部5と充填部4との界面で屈折率差が生じなくなり、外部からの入射光がこの界面で反射されなくなり、採光フィルム1内に取り込まれる光の割合が低下するおそれがなくなる。また、この界面で光が屈折しなくなり、意図しない方向に光が進行するおそれも回避できる。よって、空洞充填部5を充填部4と同じ材料にすることで、採光効率を向上できる。   The cavity filling portion 5 in FIGS. 1 and 2 is formed of the same material as the filling portion 4. Thereby, a refractive index difference does not occur at the interface between the cavity filling portion 5 and the filling portion 4, and incident light from the outside is not reflected at this interface, and the ratio of light taken into the daylighting film 1 may be reduced. Disappear. In addition, light can be prevented from being refracted at this interface, and the risk of light traveling in an unintended direction can be avoided. Therefore, the lighting efficiency can be improved by making the cavity filling part 5 the same material as the filling part 4.

なお、空洞充填部5は必ずしも充填部4と同じ材料で形成する必要はない。例えば、図3に示すように、空洞充填部5をベース部3と同じ材料で形成してもよい。上述したように、本実施形態による採光フィルム1では、ベース部3と複数の充填部4との屈折率を相違させているため、空洞充填部5をベース部3と同じ材料で形成すると、空洞充填部5と充填部4との間に屈折率差による界面が生じる。しかしながら、空気とベース部3若しくは充填部4との屈折率差が0.5程度と大きいことに対して、ベース部3と充填部4の屈折率差は、0.1〜0.2程度と比較的小さいため、この界面で入射光が反射されるおそれは少なくなり、採光フィルム1への光の取り込み効率は凹部4aが充填されていない場合と比較し向上する。   The cavity filling portion 5 is not necessarily formed of the same material as the filling portion 4. For example, as shown in FIG. 3, the cavity filling portion 5 may be formed of the same material as the base portion 3. As described above, in the daylighting film 1 according to the present embodiment, since the refractive index of the base portion 3 and the plurality of filling portions 4 are different, if the cavity filling portion 5 is formed of the same material as the base portion 3, An interface due to a difference in refractive index occurs between the filling portion 5 and the filling portion 4. However, the difference in refractive index between air and the base portion 3 or the filling portion 4 is as large as about 0.5, whereas the difference in refractive index between the base portion 3 and the filling portion 4 is about 0.1 to 0.2. Since it is relatively small, there is less possibility that incident light is reflected at this interface, and the efficiency of taking light into the daylighting film 1 is improved as compared with the case where the recess 4a is not filled.

凹部4a内にベース部3と同じ材料を充填して空洞充填部5を形成する際には、ベース部3の一方の面1a側に、流動性のある硬化性樹脂を塗布してから硬化させるため、凹部4aの内部だけでなく、図4に示すようにベース部3の一方の面1aのほぼ全域に硬化樹脂層が形成される場合もありうる。この場合であっても、硬化樹脂層の一部は凹部4a内に充填され、上述した空洞充填部5が形成される。   When the cavity filling portion 5 is formed by filling the concave portion 4a with the same material as the base portion 3, a fluid curable resin is applied to one surface 1a side of the base portion 3 and then cured. Therefore, the cured resin layer may be formed not only in the recess 4a but also in almost the entire area of the one surface 1a of the base 3 as shown in FIG. Even in this case, a part of the cured resin layer is filled in the recess 4a, and the cavity filling portion 5 described above is formed.

図1の採光フィルム1は、例えば合わせガラスの間に配置されて封止される。図5は合わせガラス10の断面構造の一例を示す図である。図示のように、採光フィルム1の両面には接着層6が配置され、これら接着層6を介してガラス等の透明基材7が両面から接着される。図1や図3に示すように採光フィルム1のベース部3の一方の面1a内で空洞充填部5が突き出していたとしても、接着層6により平坦化されるため、透明基材7と採光フィルム1は接着層6を介して面全体で強固に接着される。   The daylighting film 1 of FIG. 1 is disposed and sealed between laminated glasses, for example. FIG. 5 is a diagram illustrating an example of a cross-sectional structure of the laminated glass 10. As shown in the figure, adhesive layers 6 are disposed on both surfaces of the daylighting film 1, and a transparent substrate 7 such as glass is adhered from both surfaces via the adhesive layers 6. As shown in FIG. 1 and FIG. 3, even if the cavity filling portion 5 protrudes in one surface 1 a of the base portion 3 of the daylighting film 1, it is flattened by the adhesive layer 6. The film 1 is firmly bonded to the entire surface through the adhesive layer 6.

本実施形態による採光フィルム1は、合わせガラス10に用いられるだけではない。例えば、ガラス等の透明基材7の片面側のみに接着材を介して接着されてもよい。また、本実施形態による採光フィルム1は、ブラインドの少なくとも一部のスラットの表面に接着材を介して接着されてもよい。あるいは、各スラットの内部に採光フィルム1を組み込んでもよい。さらに、本実施形態による採光フィルム1は、ロールアップブラインドの表面に接着材を介して接着されてもよい。   The daylighting film 1 according to the present embodiment is not only used for the laminated glass 10. For example, it may be bonded to only one side of the transparent substrate 7 such as glass via an adhesive. Moreover, the lighting film 1 by this embodiment may be adhere | attached on the surface of the slat of at least one part of a blind via an adhesive material. Alternatively, the daylighting film 1 may be incorporated inside each slat. Furthermore, the daylighting film 1 according to the present embodiment may be bonded to the surface of the roll-up blind via an adhesive.

次に、本実施形態に係る採光フィルム1の構成材料および製造工程について説明する。
ベース部3の材料としては、例えば、光硬化性プレポリマーと、反応性希釈モノマーと、金型離型剤と、光重合開始剤とを混合して均一化したものが用いられる。ベース部3に不図示の基材を貼り合わせる場合は、基材の材料として、例えばPET(ポリエチレンテレフタレート)フィルムが用いられる。ベース部3の材料は、紫外線硬化性樹脂を用いる代わりに、熱硬化性樹脂または電子線硬化性樹脂などの硬化性樹脂を用いてもよい。
Next, the constituent material and manufacturing process of the daylighting film 1 according to this embodiment will be described.
As the material of the base portion 3, for example, a material obtained by mixing and homogenizing a photocurable prepolymer, a reactive dilution monomer, a mold release agent, and a photopolymerization initiator is used. When a base material (not shown) is bonded to the base portion 3, for example, a PET (polyethylene terephthalate) film is used as the base material. As the material of the base portion 3, a curable resin such as a thermosetting resin or an electron beam curable resin may be used instead of the ultraviolet curable resin.

ベース部3に、図1に示すような溝2を形成するには、例えば金型ロールが用いられる。金型ロールの表面は、溝2の形状に合わせてバイトにより切削されて、各溝2の形状に対応する複数の凸部が形成される。   In order to form the groove 2 as shown in FIG. 1 in the base portion 3, for example, a mold roll is used. The surface of the mold roll is cut with a cutting tool in accordance with the shape of the groove 2 to form a plurality of convex portions corresponding to the shape of each groove 2.

凸部が形成された金型ロールとニップロールの間にベース部3の組成物を充填して両ロールにて加圧し、例えば高圧水銀灯により紫外線を照射してベース部3の組成物を硬化させて、ベース部3が形成される。その後、剥離ローラにより、金型ローラからベース部3を離型し、ベース部3を含む中間部材を作製する。   The composition of the base portion 3 is filled between the mold roll and the nip roll formed with the convex portions and pressurized with both rolls. For example, the composition of the base portion 3 is cured by irradiating ultraviolet rays with a high-pressure mercury lamp. The base part 3 is formed. Thereafter, the base portion 3 is released from the mold roller by the peeling roller, and an intermediate member including the base portion 3 is produced.

ベース部3の溝2に充填される充填物として、例えば、光硬化性プレポリマー等の紫外線硬化性樹脂と、反応性希釈モノマーと、光散乱材と、光重合開始剤とを混合して均一化したものが用いられる。紫外線硬化性樹脂の代わりに、熱硬化性樹脂や電子線硬化性樹脂を用いてもよい。   As a filling material filled in the groove 2 of the base portion 3, for example, an ultraviolet curable resin such as a photocurable prepolymer, a reactive dilution monomer, a light scattering material, and a photopolymerization initiator are mixed and uniform. Is used. A thermosetting resin or an electron beam curable resin may be used instead of the ultraviolet curable resin.

上述したように、本実施形態では、ベース部3と充填部4とで屈折率に違いを持たせている。ベース部3も充填部4も、熱硬化性樹脂、紫外線硬化性樹脂および電子線硬化性樹脂などの硬化性樹脂を材料としているが、硬化性樹脂の材料や、それに含有される添加剤の種類等を変えることで、ベース部3と充填部4に屈折率差を持たせることができる。   As described above, in the present embodiment, the base portion 3 and the filling portion 4 have different refractive indexes. Both the base part 3 and the filling part 4 are made of a curable resin such as a thermosetting resin, an ultraviolet curable resin and an electron beam curable resin, but the curable resin material and the types of additives contained therein By changing etc., the base part 3 and the filling part 4 can have a refractive index difference.

充填部4の材料となる充填物は、中間部材上に供給されて、充填物が溝2の内部に充填されるとともに、余剰分の充填物は掻き落とされる。その後、高圧水銀灯により紫外線を照射して硬化させて、充填部4が形成される。この充填物の掻き落し及び硬化処理により、上述したように、充填部4には凹部4aが形成される。そこで、本実施形態では、以下に示す図6の製造工程にて凹部4a内に空洞充填部5を形成する処理が行われる。   The filling material as the material of the filling portion 4 is supplied onto the intermediate member, the filling material is filled into the groove 2, and the surplus filling material is scraped off. Then, the filling part 4 is formed by irradiating with an ultraviolet ray from a high pressure mercury lamp and curing. As described above, the filling portion 4 is formed with the concave portion 4a by scraping and curing the filling material. Therefore, in this embodiment, the process of forming the cavity filling portion 5 in the recess 4a is performed in the manufacturing process shown in FIG.

まず、凹部4aの周囲に所定の充填材料を塗布する(ステップS1)。所定の充填材料とは、図1や図2のように充填部4と同じ材料が望ましいが、図3や図4のようにベース部3と同じ材料でもよい。あるいは、所定の充填材料は、充填部4との屈折率差が0.1程度の材料であれば、充填部4とベース部3の材料とは異なる材料でもよい。   First, a predetermined filling material is applied around the recess 4a (step S1). The predetermined filling material is preferably the same material as the filling portion 4 as shown in FIGS. 1 and 2, but may be the same material as the base portion 3 as shown in FIGS. 3 and 4. Alternatively, the predetermined filling material may be a material different from the material of the filling portion 4 and the base portion 3 as long as the refractive index difference with the filling portion 4 is about 0.1.

次に、所定の充填材料が凹部4a内に充填されるようにスキージ処理を行って、ベース部3の一方の面1a側の余分な充填材料を掻き取る(ステップS2)。   Next, a squeegee process is performed so that a predetermined filling material is filled in the recess 4a, and excess filling material on the one surface 1a side of the base portion 3 is scraped off (step S2).

次に、凹部4aに充填された所定の充填材料を熱、紫外線または電子線等により硬化させる(ステップS3)。ステップS1〜S3の処理を1回行っただけでは、凹部4aが完全になくなるとは限らない。そこで、ステップS1〜S3の処理を少なくとも2回繰り返して、凹部4a内に空洞充填部5を形成する(ステップS4)。その後、必要に応じて接着層6が形成される。   Next, the predetermined filling material filled in the recess 4a is cured by heat, ultraviolet light, electron beam, or the like (step S3). The concave portion 4a is not completely eliminated by performing the processes of steps S1 to S3 only once. Therefore, the process of steps S1 to S3 is repeated at least twice to form the cavity filling portion 5 in the recess 4a (step S4). Thereafter, the adhesive layer 6 is formed as necessary.

接着層6の組成物は、例えば、熱可塑性樹脂であるポリビニルアセタール樹脂、エチレン酢酸ビニル共重合体樹脂、エチレンアクリル共重合体樹脂、ポリウレタン樹脂及びポリビニルアルコール樹脂等から一種若しくは複数を、可塑剤、酸化防止剤及び紫外線遮蔽剤といった添加剤と共に混合し用いたり、アクリル系樹脂の粘着材と、架橋剤と、希釈剤とを混合して形成されたりする。この接着層6の組成物を、シート若しくはフィルム状にして採光フィルム1と透明基材との間に配置し、圧をかけて空気を押し出した後、加熱することで採光フィルム1と一体化させたり、液状であれば離型フィルムに塗布して乾燥させた後、採光フィルム1に貼付させたりする。   The composition of the adhesive layer 6 is, for example, one or more of a thermoplastic resin such as polyvinyl acetal resin, ethylene vinyl acetate copolymer resin, ethylene acrylic copolymer resin, polyurethane resin and polyvinyl alcohol resin, It may be used by mixing with additives such as an antioxidant and an ultraviolet shielding agent, or may be formed by mixing an acrylic resin adhesive, a crosslinking agent, and a diluent. The composition of the adhesive layer 6 is made into a sheet or film and placed between the daylighting film 1 and the transparent substrate, and after applying pressure to extrude air, it is heated and integrated with the daylighting film 1. If it is liquid, it is applied to the release film and dried, and then attached to the daylighting film 1.

このように、本実施形態では、ベース部3の溝2内に充填材料を充填して充填部4を形成する際に生じる凹部4aを所定の充填材料で充填して空洞充填部5を形成するため、空洞充填部5と充填部4との間の界面での屈折率差を小さくすることができ、空洞充填部5が無い場合と比較し、界面で反射される光の割合を削減できる。このため、採光フィルム1への光の取り込み効率を向上できる。特に、空洞充填部5の材料を充填部4の材料と同じにすれば、空洞充填部5と充填部4との界面が実質的になくなり、ベース部3の間に凹部4aのない理想的な充填部4を形成でき、採光フィルム1の採光効果をより向上できる。   As described above, in this embodiment, the cavity filling portion 5 is formed by filling the recess 4 a generated when the filling portion 4 is formed by filling the groove 2 of the base portion 3 with the predetermined filling material. Therefore, the refractive index difference at the interface between the cavity filling part 5 and the filling part 4 can be reduced, and the proportion of light reflected at the interface can be reduced as compared with the case without the cavity filling part 5. For this reason, the efficiency of taking light into the daylighting film 1 can be improved. In particular, if the material of the cavity filling portion 5 is the same as that of the filling portion 4, the interface between the cavity filling portion 5 and the filling portion 4 is substantially eliminated, and there is no ideal recess 4 a between the base portions 3. The filling part 4 can be formed and the daylighting effect of the daylighting film 1 can be further improved.

本発明の態様は、上述した個々の実施形態に限定されるものではなく、当業者が想到しうる種々の変形も含むものであり、本発明の効果も上述した内容に限定されない。すなわち、特許請求の範囲に規定された内容およびその均等物から導き出される本発明の概念的な思想と趣旨を逸脱しない範囲で種々の追加、変更および部分的削除が可能である。   The aspect of the present invention is not limited to the individual embodiments described above, and includes various modifications that can be conceived by those skilled in the art, and the effects of the present invention are not limited to the contents described above. That is, various additions, modifications, and partial deletions can be made without departing from the concept and spirit of the present invention derived from the contents defined in the claims and equivalents thereof.

1 採光フィルム、2 溝、3 ベース部、4 充填部、4a 凹部、5 空洞充填部、6 接着層、10 合わせガラス     DESCRIPTION OF SYMBOLS 1 Daylight film, 2 groove | channel, 3 base part, 4 filling part, 4a recessed part, 5 cavity filling part, 6 adhesion layer, 10 laminated glass

Claims (7)

一方の面に沿って離隔して配置される複数の溝を有するベース部と、
前記ベース部とは異なる屈折率を持つ充填材料を前記複数の溝内に充填した複数の充填部と、
前記複数の充填部の前記一方の面側の端面形状により形成される1以上の凹部に所定の充填材料を充填した空洞充填部と、を備え、
前記ベース部と前記複数の充填部との屈折率差、前記ベース部と前記空洞充填部との屈折率差、および前記複数の充填部と前記空洞充填部との屈折率差の少なくとも一つは、0.1以上であり、
前記ベース部と前記複数の充填部との屈折率差、前記ベース部と前記空洞充填部との屈折率差、および前記複数の充填部と前記空洞充填部との屈折率差はいずれも、0.2以下である採光フィルム。
A base portion having a plurality of grooves that are spaced apart along one surface;
A plurality of filling portions filled in the plurality of grooves with a filling material having a refractive index different from that of the base portion;
A cavity filling portion in which one or more recesses formed by an end face shape on the one surface side of the plurality of filling portions are filled with a predetermined filling material;
At least one of the refractive index difference between the base portion and the plurality of filling portions, the refractive index difference between the base portion and the cavity filling portion, and the refractive index difference between the plurality of filling portions and the cavity filling portion is , 0.1 or more,
The refractive index difference between the base part and the plurality of filling parts, the refractive index difference between the base part and the cavity filling part, and the refractive index difference between the plurality of filling parts and the cavity filling part are all 0. . Daylighting film that is 2 or less.
前記空洞充填部に充填される前記所定の充填材料は、前記複数の充填部と同じ屈折率を持つ請求項1に記載の採光フィルム。   The daylighting film according to claim 1, wherein the predetermined filling material filled in the cavity filling portion has the same refractive index as the plurality of filling portions. 前記空洞充填部に充填される前記所定の充填材料は、前記複数の充填部に充填される材料である請求項2に記載の採光フィルム。   The daylighting film according to claim 2, wherein the predetermined filling material filled in the cavity filling portion is a material filled in the plurality of filling portions. 前記空洞充填部に充填される前記所定の充填材料は、前記ベース部の形成材料である請求項1に記載の採光フィルム。   The daylighting film according to claim 1, wherein the predetermined filling material filled in the cavity filling portion is a forming material of the base portion. 前記空洞充填部は、前記1以上の凹部の開口面の高さ以上の高さになるように前記1以上の凹部内に充填される請求項1乃至4のいずれかに記載の採光フィルム。   5. The daylighting film according to claim 1, wherein the cavity filling portion is filled in the one or more recesses so as to have a height equal to or higher than an opening surface of the one or more recesses. 請求項1乃至5のいずれかに記載の採光フィルムにおける前記空洞充填部が配置される前記一方の面側に接着層を介して配置される透明基材と、
前記接着層の前記空洞充填部とは反対側の面に接着層を介して配置される透明基材と、を備える採光具。
A transparent substrate disposed via an adhesive layer on the one surface side where the cavity filling portion is disposed in the daylighting film according to any one of claims 1 to 5,
A lighting tool comprising: a transparent base material disposed on a surface of the adhesive layer opposite to the cavity filling portion via an adhesive layer.
一方の面に沿って離隔して配置される複数の溝を有するベース部における、前記複数の溝内に複数の充填部を形成するとともに、前記複数の充填部の前記一方の面側の端面形状により形成される1以上の凹部に所定の充填材料を充填した空洞充填部を形成し、前記複数の充填部の前記一方の面側の端面形状により形成される1以上の凹部の周囲及び凹部内に所定の充填材料を塗布する際に、前記ベース部と前記複数の充填部との屈折率差、前記ベース部と前記空洞充填部との屈折率差、および前記複数の充填部と前記空洞充填部との屈折率差の少なくとも一つを、0.1以上とし、かつ前記ベース部と前記複数の充填部との屈折率差、前記ベース部と前記空洞充填部との屈折率差、および前記複数の充填部と前記空洞充填部との屈折率差をいずれも0.2以下とする工程と、
前記ベース部の前記一方の面側の余分な前記所定の充填材料を掻き取る工程と、
前記1以上の凹部に充填された前記所定の充填材料を硬化させる工程を、凹部が埋まるまで少なくとも1回以上実施し、前記凹部へ充填材料を充填する工程と、を備える採光フィルムの製造方法。
In a base portion having a plurality of grooves that are spaced apart along one surface, a plurality of filling portions are formed in the plurality of grooves, and an end surface shape on the one surface side of the plurality of filling portions A cavity filling portion is formed by filling a predetermined filling material in one or more recesses formed by the step, and the periphery of the one or more recesses formed by the end surface shape on the one surface side of the plurality of filling portions and in the recesses When a predetermined filling material is applied to the base portion, a difference in refractive index between the base portion and the plurality of filling portions, a difference in refractive index between the base portion and the cavity filling portion, and the plurality of filling portions and the cavity filling. At least one of the refractive index differences with the portion is 0.1 or more, and the refractive index difference between the base portion and the plurality of filling portions, the refractive index difference between the base portion and the cavity filling portion, and the Refractive index difference between a plurality of filling parts and the cavity filling part A step of 0.2 or less Re,
Scraping off the excess predetermined filling material on the one surface side of the base portion;
A step of curing the predetermined filling material filled in the one or more recesses is performed at least once until the recesses are filled, and filling the filling material with the filling material.
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