JP2020118885A - Light control unit - Google Patents
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本発明は、光透過率の可変な調光シートを備える調光ユニットに関する。 The present invention relates to a light control unit including a light control sheet having a variable light transmittance.
調光シートは、調光層と、調光層を挟む一対の透明電極層とを備えている。一対の透明電極層間の電位差に応じて調光層の配向状態が変わることにより、調光シートの光透過率が変わる。調光シートは、例えば、建物や車両等の窓ガラスに貼り付けられる（例えば、特許文献１参照）。 The light control sheet includes a light control layer and a pair of transparent electrode layers sandwiching the light control layer. The light transmittance of the light control sheet is changed by changing the alignment state of the light control layer according to the potential difference between the pair of transparent electrode layers. The light control sheet is attached to, for example, a window glass of a building, a vehicle, or the like (see, for example, Patent Document 1).
調光シートの使用形態として、屋外と屋内との境界部や温度差の大きい２つの空間の境界部に調光シートが配置される場合等に、雨水や結露等に起因した水分が調光シートに付着することが起こり得る。水分が調光層の内部に浸入すると、調光シートにおける光透過率の可変機能が低下する。 As a form of use of the light control sheet, when the light control sheet is arranged at the boundary between the outdoor and the indoor or at the boundary between two spaces having a large temperature difference, the moisture caused by rainwater or dew condensation is used. Can be attached to the. When water penetrates into the light control layer, the variable function of the light transmittance of the light control sheet is deteriorated.
調光層として液晶組成物を含む材料を用いる場合、酸，水分，紫外線などによって劣化が生じやすく、特に、調光層が挟持されたシート端部（周縁部）は水分や酸，紫外線などに触れる可能性が高く、調光層の劣化が生じ易い。 When a material containing a liquid crystal composition is used for the light control layer, deterioration easily occurs due to acid, moisture, ultraviolet rays, etc. In particular, the sheet edge portion (peripheral portion) where the light control layer is sandwiched is protected against moisture, acid, ultraviolet rays, etc. There is a high possibility of contact, and deterioration of the light control layer is likely to occur.
前面基板上に液晶組成物を含む材料からなる調光層（ＰＤＬＣ：液晶分子がポリマー中に分散配置された構成の高分子分散型液晶）がコーティングされ、これに背面基板をラミネートした形態の液晶パネルにおける周縁部のシール構造に係る提案として、特許文献２では、前面基板の表面と背面基板の側面およびＰＤＬＣの側面に、シール剤を塗布するシール構造が開示されている。 A liquid crystal in which a front substrate is coated with a light control layer (PDLC: polymer dispersed liquid crystal in which liquid crystal molecules are dispersed and arranged in a polymer) made of a material containing a liquid crystal composition, and a rear substrate is laminated thereon. As a proposal regarding the sealing structure of the peripheral portion of the panel, Patent Document 2 discloses a sealing structure in which a sealing agent is applied to the front surface of the front substrate, the side surface of the rear substrate, and the side surface of the PDLC.
シール剤が樹脂製の接着剤の場合、防水機能が不十分である。また、液状のシール剤を塗布形成した後、十分に乾燥硬化させる必要があり、乾燥工程のために設備や時間を要することになる。調光シートの使用形態として、垂直に立った状態のガラス板や間仕切りに貼り合わせて適用する場合、液状のシール剤を塗布形成することは、施工現場での取り扱いの面でも不利である。 When the sealing agent is a resin adhesive, the waterproof function is insufficient. In addition, after the liquid sealing agent is applied and formed, it is necessary to sufficiently dry and cure it, which requires equipment and time for the drying step. When the light control sheet is used by being attached to a vertically standing glass plate or a partition, applying the liquid sealing agent by coating is disadvantageous in terms of handling at the construction site.
本発明は、調光シートを備える調光ユニットにおける防水性を高めた構造を提案することを目的とする。 An object of the present invention is to propose a structure having improved waterproofness in a light control unit including a light control sheet.
上記課題を解決する調光ユニットは、
液晶組成物を含む調光層、および、当該調光層を挟む一対の透明電極層を備える矩形の調光シートと、前記調光シートよりも大きい外形を有する支持基材とを備え、
前記支持基材上において、前記調光シートは、その四辺の外縁に沿って延びて端面を覆う防水テープにより接着され、防水テープの継ぎ目は、別途に接着されてある粘着テープ上に前記粘着テープを覆うように配置された構成であり、
調光シートの端面を覆う防水テープの継ぎ目に用いられる粘着テープは、厚さが防水テープの１／２以下であることを特徴とする。
The dimming unit that solves the above problems is
A light control layer containing a liquid crystal composition, and a rectangular light control sheet having a pair of transparent electrode layers sandwiching the light control layer, and a supporting base material having an outer shape larger than the light control sheet,
On the supporting substrate, the light control sheet is adhered by a waterproof tape that extends along the outer edges of the four sides and covers the end face, and the seam of the waterproof tape is adhered onto the adhesive tape that is separately adhered. It is a configuration arranged to cover
The adhesive tape used at the seam of the waterproof tape covering the end surface of the light control sheet is characterized in that the thickness is 1/2 or less of the waterproof tape.
防水テープは、基材の片面に粘着層が形成された構成であり、
粘着テープは、防水テープの基材の１／２以下の厚さの支持基材の両面に粘着層が形成された構成、または、前記支持基材に粘着剤が含浸された構成であっても良い。
The waterproof tape has a structure in which an adhesive layer is formed on one side of the base material,
The pressure-sensitive adhesive tape may have a structure in which a pressure-sensitive adhesive layer is formed on both surfaces of a supporting base material having a thickness of 1/2 or less of the base material of the waterproof tape, or a structure in which the supporting base material is impregnated with an adhesive. good.
調光ユニットの別構成としては、
液晶組成物を含む調光層、および、当該調光層を挟む一対の透明電極層を備える矩形の調光シートと、前記調光シートよりも大きい外形を有する支持基材とを備え、
前記支持基材上において、前記調光シートは、その四辺の外縁に沿って延びて端面を覆う防水テープにより接着され、防水テープの継ぎ目は粘着テープにより覆われて接着された構成であり、
調光シートの端面を覆う防水テープの継ぎ目に用いられる粘着テープは、厚さが防水テープの１／２以下であることを特徴とする。
As another configuration of the light control unit,
A light control layer containing a liquid crystal composition, and a rectangular light control sheet having a pair of transparent electrode layers sandwiching the light control layer, and a supporting base material having an outer shape larger than the light control sheet,
On the support substrate, the light control sheet is a structure that is adhered by a waterproof tape that extends along the outer edges of the four sides and covers the end face, and the seam of the waterproof tape is covered and adhered by an adhesive tape,
The adhesive tape used at the seam of the waterproof tape covering the end surface of the light control sheet is characterized in that the thickness is 1/2 or less of the waterproof tape.
防水テープは、基材の片面に粘着層が形成された構成であり、
粘着テープは、防水テープの基材の１／２以下の基材の片面に粘着層が形成された構成であっても良い。
The waterproof tape has a structure in which an adhesive layer is formed on one side of the base material,
The adhesive tape may have a structure in which an adhesive layer is formed on one surface of a base material that is ½ or less of the base material of the waterproof tape.
液状のシール剤を使用しないため、調光シートを備える調光ユニットにおける防水性が高まり、液晶層の劣化が抑制される。また、乾燥工程のために要していた設備や時間が省かれると共に、施工現場での取り扱いの面での不利が解消される。 Since the liquid sealing agent is not used, the waterproofness of the light control unit including the light control sheet is enhanced, and the deterioration of the liquid crystal layer is suppressed. In addition, the equipment and time required for the drying process are saved, and the disadvantage in terms of handling at the construction site is eliminated.
テープを用いて矩形の調光シートの端部（四辺）を覆う場合、直線状のテープで一辺毎に接着すると、必然的にテープ間の継ぎ目が発生し、継ぎ目から水分，湿気の進入を招いてしまうため、さらに補助的なテープを継ぎ目部分に貼ることにより、継ぎ目を被覆することが必要となる。本発明によれば、補助的なテープの採用により生じる段差が抑制され、見栄えを損なわずに防水性を確保することが可能となる。 When using tape to cover the edges (four sides) of a rectangular light control sheet, if each side is bonded with a linear tape, a seam between the tapes will inevitably occur, causing moisture and moisture to enter from the seam. Therefore, it is necessary to cover the seam by applying an additional tape to the seam portion. ADVANTAGE OF THE INVENTION According to this invention, the level difference which arises by adoption of an auxiliary tape is suppressed, and it becomes possible to ensure waterproofness, without spoiling appearance.
図面を参照して、調光ユニットの一実施形態を説明する。
［調光ユニットの全体構成］
図１が示すように、調光ユニット１０は、調光シート２０と、給電部３０と、支持基材４０と、防水テープ５０とを備えている。
An embodiment of a light control unit will be described with reference to the drawings.
[Overall structure of light control unit]
As shown in FIG. 1, the light control unit 10 includes a light control sheet 20, a power supply section 30, a support base material 40, and a waterproof tape 50.
調光シート２０は、支持基材４０に貼り付けられている。調光シート２０の表面２０Ｆと対向する位置から見た平面視において、支持基材４０の外形は調光シート２０の外形よりも大きい。言い換えれば、上記平面視において、調光シート２０の外縁は全て、支持基材４０の外縁の内側に位置する。すなわち、調光シート２０は、支持基材４０上のみに位置した状態で支持基材４０の表面に取り付けられている。調光シート２０および支持基材
４０の外形形状は特に限定されない。図１では、一例として、調光シート２０の外形と支持基材４０の外形とが、いずれも矩形形状である形態を示している。
The light control sheet 20 is attached to the support base material 40. The outer shape of the support base 40 is larger than the outer shape of the light control sheet 20 in a plan view seen from a position facing the front surface 20F of the light control sheet 20. In other words, all the outer edges of the light control sheet 20 are located inside the outer edge of the support base 40 in the plan view. That is, the light control sheet 20 is attached to the surface of the support base 40 while being positioned only on the support base 40. The outer shapes of the light control sheet 20 and the supporting base material 40 are not particularly limited. In FIG. 1, as an example, the outer shape of the light control sheet 20 and the outer shape of the support base material 40 are both rectangular.
給電部３０は、調光シート２０が備える一対の透明電極層を電源と接続して電力を供給するための部分である。給電部３０は、上記一対の透明電極層の一方と電源とを接続するための第１給電部３０Ａと、上記一対の透明電極層の他方と電源とを接続するための第２給電部３０Ｂとを含む。給電部３０は、調光シート２０の端部にて調光シート２０と接続して調光シート２０の外側へ延び、さらに、支持基材４０の外側まで延びている。給電部３０Ａ，３０Ｂには、ＦＰＣ（Flexible printed circuits：フレキシブルプリント配線板）が好適に使用される。 The power feeding section 30 is a section for connecting a pair of transparent electrode layers included in the light control sheet 20 to a power source to supply power. The power feeding unit 30 includes a first power feeding unit 30A for connecting one of the pair of transparent electrode layers to a power source, and a second power feeding unit 30B for connecting the other of the pair of transparent electrode layers to a power source. including. The power supply unit 30 is connected to the light control sheet 20 at the end of the light control sheet 20, extends to the outside of the light control sheet 20, and further extends to the outside of the support base material 40. An FPC (Flexible printed circuit) is preferably used for the power feeding units 30A and 30B.
なお、図１では、第１給電部３０Ａと第２給電部３０Ｂとが調光シート２０の一辺に沿って並ぶ形態を例示しているが、第１給電部３０Ａと第２給電部３０Ｂとの配置関係は特に限定されない。 In addition, in FIG. 1, although the 1st electric power feeding part 30A and the 2nd electric power feeding part 30B are arranged along one side of the light control sheet 20, the 1st electric power feeding part 30A and the 2nd electric power feeding part 30B are illustrated. The arrangement relationship is not particularly limited.
調光シート２０の表面２０Ｆと対向する位置から見た平面視において、防水テープ５０は、調光シート２０の全周を取り囲んでいる。防水テープ５０は、調光シート２０の端面からの水分の浸入を防ぐための端面（四辺）５１だけでなく、給電部３０付近からの水分の浸入を防ぐための給電箇所５２に形成されても良い。 The waterproof tape 50 surrounds the entire periphery of the light control sheet 20 in a plan view seen from a position facing the surface 20F of the light control sheet 20. The waterproof tape 50 may be formed not only on the end faces (four sides) 51 for preventing the intrusion of water from the end face of the light control sheet 20, but also on the power supply points 52 for preventing the intrusion of water from the vicinity of the power supply unit 30. good.
図２に示すように、調光シート２０は、調光層２１と、一対の透明電極層である第１透明電極層２２Ａおよび第２透明電極層２２Ｂと、一対の透明支持層である第１透明支持層２３Ａおよび第２透明支持層２３Ｂとを備えている。第１透明電極層２２Ａと第２透明電極層２２Ｂとは、調光層２１を挟み、第１透明支持層２３Ａと第２透明支持層２３Ｂとは、調光層２１および透明電極層２２Ａ，２２Ｂを挟んでいる。第１透明支持層２３Ａは、第１透明電極層２２Ａを支持し、第２透明支持層２３Ｂは、第２透明電極層２２Ｂを支持している。 As shown in FIG. 2, the light control sheet 20 includes a light control layer 21, a first transparent electrode layer 22A and a second transparent electrode layer 22B that are a pair of transparent electrode layers, and a first transparent support layer that is a pair. The transparent support layer 23A and the second transparent support layer 23B are provided. The first transparent electrode layer 22A and the second transparent electrode layer 22B sandwich the light control layer 21, and the first transparent support layer 23A and the second transparent support layer 23B sandwich the light control layer 21 and the transparent electrode layers 22A and 22B. Sandwiched between. The first transparent support layer 23A supports the first transparent electrode layer 22A, and the second transparent support layer 23B supports the second transparent electrode layer 22B.
調光層２１は、液晶組成物を含む。調光層２１は、例えば、高分子ネットワーク型液晶（ＰＮＬＣ：Ｐｏｌｙｍｅｒ Ｎｅｔｗｏｒｋ Ｌｉｑｕｉｄ Ｃｒｙｓｔａｌ）、高分子分散型液晶（ＰＤＬＣ：Ｐｏｌｙｍｅｒ Ｄｉｓｐｅｒｓｅｄ Ｌｉｑｕｉｄ Ｃｒｙｓｔａｌ）、カプセル型ネマティック液晶(ＮＣＡＰ：Ｎｅｍａｔｉｃ Ｃｕｒｖｉｌｉｎｅａｒ Ａｌｉｇｎｅｄ Ｐｈａｓｅ)等から構成される。例えば、高分子ネットワーク型液晶は、３次元の網目状を有した高分子ネットワークを備え、高分子ネットワークが有する空隙に液晶分子を保持する。調光層２１が含む液晶分子は、例えば、誘電率異方性が正であって、液晶分子の長軸方向の誘電率が液晶分子の短軸方向の誘電率よりも大きい。液晶分子は、例えば、シッフ塩基系、アゾ系、アゾキシ系、ビフェニル系、ターフェニル系、安息香酸エステル系、トラン系、ピリミジン系、シクロヘキサンカルボン酸エステル系、フェニルシクロヘキサン系、ジオキサン系の液晶分子である。 The light control layer 21 includes a liquid crystal composition. The dimming layer 21 is formed of, for example, a polymer network liquid crystal (PNLC), a polymer dispersed liquid crystal (PDLC), a capsule nematic liquid crystal (NCAP) or the like. Composed. For example, the polymer network type liquid crystal includes a polymer network having a three-dimensional network shape and holds liquid crystal molecules in the voids of the polymer network. The liquid crystal molecules included in the light control layer 21 have, for example, positive dielectric anisotropy, and the dielectric constant in the major axis direction of the liquid crystal molecules is larger than the dielectric constant in the minor axis direction of the liquid crystal molecules. The liquid crystal molecules are, for example, Schiff base type, azo type, azoxy type, biphenyl type, terphenyl type, benzoic acid ester type, tolan type, pyrimidine type, cyclohexanecarboxylic acid ester type, phenylcyclohexane type, dioxane type liquid crystal molecules. is there.
第１透明電極層２２Ａおよび第２透明電極層２２Ｂの各々は、導電性を有する透明な層である。透明電極層２２Ａ，２２Ｂを構成する材料としては、例えば、酸化インジウムスズ（ＩＴＯ）、フッ素ドープ酸化スズ（ＦＴＯ）、酸化スズ、酸化亜鉛、カーボンナノチューブ（ＣＮＴ）、ポリ（３，４-エチレンジオキシチオフェン）（ＰＥＤＯＴ）を含むポリマー、Ａｇ合金薄膜を含む多層膜等が挙げられる。 Each of the first transparent electrode layer 22A and the second transparent electrode layer 22B is a transparent layer having conductivity. Examples of the material forming the transparent electrode layers 22A and 22B include indium tin oxide (ITO), fluorine-doped tin oxide (FTO), tin oxide, zinc oxide, carbon nanotube (CNT), and poly(3,4-ethylenediethylene). Examples thereof include polymers containing oxythiophene) (PEDOT) and multilayer films containing Ag alloy thin films.
第１透明支持層２３Ａおよび第２透明支持層２３Ｂの各々は、透明な基材である。透明支持層２３Ａ，２３Ｂとしては、例えば、ガラス基板やシリコン基板、あるいは、ポリエチレン、ポリスチレン、ポリエチレンテレフタレート、ポリビニルアルコール、ポリカーボネート、ポリ塩化ビニル、ポリイミド、ポリサルホン、シクロオレフィンポリマー、ト
リアセチルセルロース等からなる高分子フィルムが用いられる。
Each of the first transparent support layer 23A and the second transparent support layer 23B is a transparent base material. The transparent support layers 23A and 23B are made of, for example, a glass substrate or a silicon substrate, or a polyethylene, polystyrene, polyethylene terephthalate, polyvinyl alcohol, polycarbonate, polyvinyl chloride, polyimide, polysulfone, cycloolefin polymer, triacetyl cellulose or the like. Molecular films are used.
なお、調光シート２０は、調光層２１、透明電極層２２Ａ，２２Ｂ、および、透明支持層２３Ａ，２３Ｂに加えて、他の層を備えていてもよい。他の層は、例えば、紫外線バリア機能を有する層等のように、調光層２１や透明電極層２２Ａ，２２Ｂを保護するための層や、調光シート２０における光の透過性の制御に寄与する層や、調光シート２０の強度や耐熱性等の特性を高める層等が挙げられる。 The light control sheet 20 may include other layers in addition to the light control layer 21, the transparent electrode layers 22A and 22B, and the transparent support layers 23A and 23B. The other layer contributes to a layer for protecting the light control layer 21 and the transparent electrode layers 22A and 22B, such as a layer having an ultraviolet barrier function, and a control of the light transmittance of the light control sheet 20. And a layer that enhances properties such as strength and heat resistance of the light control sheet 20.
第１透明電極層２２Ａは、第１給電部３０Ａを通じて駆動回路に接続され、第２透明電極層２２Ｂは、第２給電部３０Ｂを通じて駆動回路に接続される。これによって、透明電極層２２Ａ，２２Ｂと電源とが電気的に接続される。駆動回路は、電源から受ける電圧を駆動電圧に変換して給電部３０を通じて透明電極層２２Ａ，２２Ｂに印加する。 The first transparent electrode layer 22A is connected to the drive circuit through the first power supply section 30A, and the second transparent electrode layer 22B is connected to the drive circuit through the second power supply section 30B. As a result, the transparent electrode layers 22A and 22B are electrically connected to the power source. The drive circuit converts a voltage received from the power source into a drive voltage and applies it to the transparent electrode layers 22A and 22B through the power feeding unit 30.
透明電極層２２Ａ，２２Ｂに駆動電圧が印加されていないとき、液晶分子の長軸方向の向きは不規則である。そのため、調光層２１に入射した光は散乱し、調光シート２０は白濁して見える。すなわち、調光シート２０は不透明である。一方、給電部３０を通じて第１透明電極層２２Ａと第２透明電極層２２Ｂとの間に駆動電圧が印加されると、液晶分子が配向され、液晶分子の長軸方向が透明電極層２２Ａ，２２Ｂ間の電界方向に沿った向きとなる。その結果、調光層２１を光が透過しやすくなり、調光シート２０は透明となる。 When no drive voltage is applied to the transparent electrode layers 22A and 22B, the orientation of the liquid crystal molecules in the long axis direction is irregular. Therefore, the light incident on the light control layer 21 is scattered, and the light control sheet 20 looks cloudy. That is, the light control sheet 20 is opaque. On the other hand, when a driving voltage is applied between the first transparent electrode layer 22A and the second transparent electrode layer 22B through the power supply unit 30, the liquid crystal molecules are aligned, and the long axis direction of the liquid crystal molecules is transparent electrode layers 22A and 22B. The direction is along the direction of the electric field between them. As a result, light is easily transmitted through the light control layer 21, and the light control sheet 20 becomes transparent.
また、調光シート２０は、調光層２１と透明電極層２２Ａ，２２Ｂとの間で調光層２１を挟む一対の配向層を備えていてもよい。配向層は、調光層２１が含む液晶分子の配向を制御する層であり、駆動電圧が印加されていないとき、液晶分子を配向層の法線方向に沿って配向させる。配向層を備える構成では、透明電極層２２Ａ，２２Ｂに駆動電圧が印加されているとき、調光シート２０が不透明となり、透明電極層２２Ａ，２２Ｂに駆動電圧が印加されていないとき、調光シート２０が透明となる。配向層を構成する材料としては、例えば、ポリアミド、ポリイミド、ポリカーボネート、ポリスチレン、ポリシロキサン、ポリエチレンテレフタレートやポリエチレンナフタレート等のポリエステル、ポリメチルメタクリレート等のポリアクリレートが挙げられる。配向層を形成するための配向処理は、例えば、ラビング処理、偏光照射処理、微細加工処理である。 Further, the light control sheet 20 may include a pair of alignment layers that sandwich the light control layer 21 between the light control layer 21 and the transparent electrode layers 22A and 22B. The alignment layer is a layer that controls the alignment of the liquid crystal molecules included in the light control layer 21, and aligns the liquid crystal molecules along the normal direction of the alignment layer when a drive voltage is not applied. In the configuration including the alignment layer, the light control sheet 20 becomes opaque when a drive voltage is applied to the transparent electrode layers 22A and 22B, and when the drive voltage is not applied to the transparent electrode layers 22A and 22B. 20 becomes transparent. Examples of the material forming the alignment layer include polyamide, polyimide, polycarbonate, polystyrene, polysiloxane, polyester such as polyethylene terephthalate and polyethylene naphthalate, and polyacrylate such as polymethylmethacrylate. The alignment treatment for forming the alignment layer is, for example, a rubbing treatment, a polarized light irradiation treatment, or a fine processing treatment.
調光シート２０は、例えば、調光シート２０を構成する各層を備えた多層体からなる大判のシートから所望の形状に切り出される。したがって、調光層２１、透明電極層２２Ａ，２２Ｂ、および、透明支持層２３Ａ，２３Ｂを含む調光シート２０の各層は、調光シート２０の端面２０Ｅまで延びている。 The light control sheet 20 is cut into a desired shape from, for example, a large-sized sheet made of a multi-layer body including the layers forming the light control sheet 20. Therefore, each layer of the light control sheet 20 including the light control layer 21, the transparent electrode layers 22A and 22B, and the transparent support layers 23A and 23B extends to the end surface 20E of the light control sheet 20.
支持基材４０は、透明な板状の基材である。支持基材４０の材料としては、例えば、ガラス、アクリル、ポリカーボネート、ポリエチレン、ポリプロピレン、ポリエチレンテレフタレート等が用いられる。支持基材４０は、例えば、窓ガラスやガラス壁等の建材であってもよいし、自動車の窓ガラス等の車両用部材であってもよい。また、調光シート２０が取り付けられる面は、平面であってもよいし、曲面であってもよい。 The supporting base material 40 is a transparent plate-shaped base material. As the material of the supporting base material 40, for example, glass, acrylic, polycarbonate, polyethylene, polypropylene, polyethylene terephthalate or the like is used. The supporting base material 40 may be, for example, a building material such as a window glass or a glass wall, or a vehicle member such as a window glass of an automobile. The surface to which the light control sheet 20 is attached may be a flat surface or a curved surface.
調光シート２０は、透明粘着層６０を介して支持基材４０に貼り付けられている。透明粘着層６０の材料は、透明で接着性を有する層を形成可能であれば特に限定されない。例えば、ＯＣＡ（Ｏｐｔｉｃａｌ Ｃｌｅａｒ Ａｄｈｅｓｉｖｅ）フィルムは、高い透明性を有するため、透明粘着層６０として用いることに適している。なお、透明粘着層６０は、調光ユニット１０の構成部材に含まれる。 The light control sheet 20 is attached to the support base material 40 via the transparent adhesive layer 60. The material of the transparent adhesive layer 60 is not particularly limited as long as it can form a transparent and adhesive layer. For example, an OCA (Optical Clear Adhesive) film has high transparency and is suitable for use as the transparent adhesive layer 60. The transparent adhesive layer 60 is included in the constituent members of the light control unit 10.
防水テープ５０は、耐水性を有する基材の表面に粘着剤からなる層を有するテープである。例えば、アクリルフォーム基材の表面にアクリル系粘着剤の層を有するテープは、強
い接着性を有するため、好適に用いられる。端面５１と給電箇所５２でとは、同一の材料から構成されてもよいし、互いに異なる材料から構成されてもよい。
The waterproof tape 50 is a tape having a layer made of an adhesive on the surface of a water resistant base material. For example, a tape having an acrylic pressure-sensitive adhesive layer on the surface of an acrylic foam substrate has strong adhesiveness and is therefore preferably used. The end surface 51 and the power feeding point 52 may be made of the same material or different materials.
［防水部の詳細構成］
図３を参照して、端面（四辺）５１の詳細な構造例を説明する。図３は、端面（四辺）５１の幅方向、すなわち、調光シート２０の端面２０Ｅと直交する方向に沿った調光ユニット１０の断面構造を示す。
[Detailed structure of waterproof part]
A detailed structural example of the end face (four sides) 51 will be described with reference to FIG. 3. FIG. 3 shows a cross-sectional structure of the light control unit 10 along a width direction of the end surface (four sides) 51, that is, a direction orthogonal to the end surface 20E of the light control sheet 20.
図３に示す構造例では、端面（四辺）５１に接着する防水テープ５０のうち、調光シート２０の上面を覆って接着される部分５１ｃと支持基材４０に接着される部分５１ｂの長さ（平面図では、テープの幅にあたる）を大きくするほど、防水テープ５０と接着対象との境界部から回り込んで調光シート２０の端面２０Ｅに達する水分や酸などが浸入する可能性が低減され、防水性が高められる。 In the structure example shown in FIG. 3, of the waterproof tape 50 adhered to the end faces (four sides) 51, the lengths of the part 51 c adhered to cover the upper surface of the light control sheet 20 and the part 51 b adhered to the support base material 40. As the width (corresponding to the width of the tape in the plan view) is increased, the possibility that water, acid or the like that wraps around the boundary between the waterproof tape 50 and the object to be bonded and reaches the end surface 20E of the light control sheet 20 is reduced. , Waterproofness is improved.
図４は、調光シート２０の全周を取り囲んで支持基材４０上に固着する防水テープ５０の配置手法を概念的に示す図（平面視）である。説明の便宜上、給電部３０の図示は省略すると共に、実際の縮尺とは異なるサイズで誇張して図示している。 FIG. 4 is a diagram (plan view) conceptually showing a method of arranging the waterproof tape 50 that surrounds the entire periphery of the light control sheet 20 and is fixed onto the support base material 40. For convenience of explanation, the power supply unit 30 is not shown, and is illustrated in an exaggerated size different from the actual scale.
調光シート２０（輪郭の点線で囲まれる矩形部分）の表面２０Ｆと対向する位置から見た平面視において、防水テープ５０は、調光シート２０の全周を取り囲んでいる。図４（ａ）は、防水テープ５０が「ロの字（四方枠）」の形状に加工され、無垢で継ぎ目がない理想的な形態である。防水テープ５０は、防水性を有する樹脂基材の片面に粘着層が形成された構成であり、樹脂基材，粘着層は、用途や要求される防水機能，貼付対象の素材などに応じて選定される。 The waterproof tape 50 surrounds the entire periphery of the light control sheet 20 in a plan view seen from a position facing the surface 20F of the light control sheet 20 (a rectangular portion surrounded by a dotted line of the contour). FIG. 4A shows an ideal form in which the waterproof tape 50 is processed into a "square shape (four-sided frame)" shape and is solid and seamless. The waterproof tape 50 has a structure in which an adhesive layer is formed on one surface of a resin base material having a waterproof property, and the resin base material and the adhesive layer are selected according to the application, the required waterproof function, the material to be attached, etc. To be done.
図４（ａ）の防水テープ５０は、貼付対象の調光シート２０，支持基材４０が大面積（一辺が１ｍ以上）である場合、「ロの字（四方枠）」の形状に加工された防水テープ５０を得ることは困難であり、作業現場での取り扱いの上でも難しく、現実的ではない。本発明で用いる防水テープ５０の具体的製品としては、コニシ製：ストームガードクリア（補修テープ）などが好適である。 The waterproof tape 50 of FIG. 4A is processed into a "square shape (square frame)" when the light control sheet 20 and the supporting base material 40 to be attached have a large area (one side is 1 m or more). It is difficult to obtain the waterproof tape 50, and it is difficult to handle at the work site, which is not realistic. As a specific product of the waterproof tape 50 used in the present invention, Storm Guard Clear (repair tape) manufactured by Konishi is suitable.
対して、矩形の調光シート２０の四辺全周を一辺ずつ直線状の防水テープ５０（４枚）で貼付する手法が現実的である。図４（ｂ）に示す様に、貼付対象の調光シート２０が大きく一辺に１本の防水テープ５０を適用することが難しい場合には、同図の長辺（縦）では２枚の防水テープ５０（５０ｃと５０ｄ，５０ｅと５０ｆ）を継ぎ合わせて用いることも考えられる。図４（ｂ）の例では、６箇所の継ぎ目を持っているが、直線状にカットされた防水テープ５０同士の継ぎ目の部分では、新たな防水対策を講じる必要が生じる。 On the other hand, a practical method is to stick the entire four sides of the rectangular light control sheet 20 on each side with a linear waterproof tape 50 (four sheets). As shown in FIG. 4B, when the light control sheet 20 to be attached is large and it is difficult to apply one waterproof tape 50 on one side, two waterproof sheets are used on the long side (vertical) in the same figure. It is also conceivable to use the tapes 50 (50c and 50d, 50e and 50f) jointly. In the example of FIG. 4B, there are 6 seams, but it is necessary to take new waterproofing measures at the seams between the waterproof tapes 50 that are cut linearly.
本発明は、防水テープ５０同士の継ぎ目の部分を好適に被覆して、防水性を確実にした構造を提案するものである。図５は、防水テープ５０同士の継ぎ目を示す断面図である。 The present invention proposes a structure in which the waterproof property is ensured by suitably covering the joint portion between the waterproof tapes 50. FIG. 5 is a sectional view showing a joint between the waterproof tapes 50.
図５（ａ）は、一方の防水テープ（５０ｃ）の端部上に他方の防水テープ（５０ａ）の端部を重ねて貼った状態である。同図に示す様に、防水テープ５０の厚み分だけ重なり合う箇所が盛り上がると共に、矢印で示す箇所に生じる隙間から水分などが浸入するリスクが発生する。図５では便宜的に、防水テープ５０ａと防水テープ５０ｃとを色分けて図示している。尚、防水テープ５０の基材と粘着層は分けずにまとめて一体的に表している。 FIG. 5A shows a state in which the end portion of the other waterproof tape (50a) is laminated on the end portion of the one waterproof tape (50c). As shown in the same figure, a portion where the waterproof tape 50 overlaps by the thickness thereof rises, and there is a risk that moisture or the like will enter through a gap formed at a portion indicated by an arrow. In FIG. 5, for convenience, the waterproof tape 50a and the waterproof tape 50c are shown in different colors. Note that the base material and the adhesive layer of the waterproof tape 50 are collectively shown without being separated.
図５（ｂ）は、防水テープ５０ａと防水テープ５０ｃの端部同士を対向させて、同一面に配置して貼った状態である。図５（ｂ）では、重なり合いに伴う盛り上がりは生じないが、防水テープ５０ａと防水テープ５０ｃの端部同士の接合箇所には水分などが入り込むだけの隙間（矢印で示す）があり、この隙間での防水対策が求められる。 FIG. 5B shows a state in which the end portions of the waterproof tape 50a and the waterproof tape 50c are opposed to each other and are arranged and attached on the same surface. In FIG. 5(b), the swelling due to the overlapping does not occur, but there is a gap (indicated by an arrow) where moisture or the like can enter at the joint between the end portions of the waterproof tape 50a and the waterproof tape 50c. Waterproof measures are required.
図５（ｃ），図５（ｄ）は、防水テープ５０ａと防水テープ５０ｃの端部同士を対向させて、同一面に配置して貼る場合に、防水テープ５０ａと防水テープ５０ｃの継ぎ目に発生する隙間を塞ぐために、別部材の粘着テープを配置する手法（２タイプ）を示す断面図である。 5(c) and 5(d) are generated at the joint between the waterproof tape 50a and the waterproof tape 50c when the waterproof tape 50a and the waterproof tape 50c are placed on the same surface with the ends thereof facing each other and attached. It is sectional drawing which shows the method (2 type) which arrange|positions the adhesive tape of another member in order to block the clearance gap.
図５（ｃ）は、継ぎ目となる箇所の調光シート２０や支持基材４０に、粘着テープ７０を直接貼っておき、防水テープ５０ａと防水テープ５０ｃの端部同士を粘着テープ７０上で対向させて接合する配置である。 In FIG. 5C, the adhesive tape 70 is directly adhered to the light control sheet 20 and the support base material 40 at the joint, and the ends of the waterproof tape 50a and the waterproof tape 50c are opposed to each other on the adhesive tape 70. It is an arrangement that allows them to be joined.
図５（ｄ）は、調光シート２０や支持基材４０に貼ってある防水テープ５０ａと防水テープ５０ｃの端部同士が対向した箇所の上から粘着テープ７０を被覆して接合する配置である。 FIG. 5D shows an arrangement in which the adhesive tape 70 is covered and joined from above the positions where the ends of the waterproof tape 50a and the waterproof tape 50c attached to the light control sheet 20 or the support base material 40 face each other. ..
何れの配置タイプの場合でも、粘着テープ７０は、厚さが防水テープの１／２以下であり、粘着テープ７０を被覆することにより盛り上がる高さは図５（ａ）に比べて１／２以下に抑制され、生じる段差が目立たないだけでなく、新たな隙間は生じず、効果的に接合箇所の隙間が塞がれる。 In any of the arrangement types, the adhesive tape 70 has a thickness that is 1/2 or less of the waterproof tape, and the height that rises when the adhesive tape 70 is covered is 1/2 or less as compared with FIG. In addition to being suppressed by the above, the resulting step is not conspicuous, a new gap is not generated, and the gap at the joint is effectively closed.
粘着テープ７０は、防水性の高い樹脂基材表面に粘着層を形成した構造が好適であるが、基材レスな粘着層であっても、元々狭い接合箇所の隙間を塞ぐ上では、防水性は十分確保される。粘着テープ７０の具体的製品としては、３Ｍ製：Ｆ−９４６０ＰＣ（両面テープ）などが好適である。 The adhesive tape 70 preferably has a structure in which an adhesive layer is formed on the surface of a highly waterproof resin base material. However, even if the adhesive layer is a base material-less adhesive layer, it is waterproof to close the gap between the originally narrow joints. Is sufficiently secured. As a specific product of the adhesive tape 70, 3M: F-9460PC (double-sided tape) or the like is suitable.
防水テープ５０ａと防水テープ５０ｃの継ぎ目において、調光シート２０の端部で露出する調光層２１を保護する上では、露出部分を防水テープ５０ａ，５０ｂの上から間接的に粘着テープ７０で覆う図５（ｄ）の配置よりも、露出部分を粘着テープ７０で直接的に覆う図５（ｃ）の配置の方が有効である。 At the joint between the waterproof tape 50a and the waterproof tape 50c, in order to protect the light control layer 21 exposed at the end of the light control sheet 20, the exposed portion is indirectly covered with the adhesive tape 70 from above the waterproof tapes 50a and 50b. The arrangement of FIG. 5C in which the exposed portion is directly covered with the adhesive tape 70 is more effective than the arrangement of FIG. 5D.
防水テープ５０ａと防水テープ５０ｃの継ぎ目から水分などを浸入させないことよりも、仮に継ぎ目からの浸入が発生した場合でも、最終的に調光シート２０の端部で露出する調光層２１を保護する上では、直接的に調光層２１を覆って水分などを到達させないことが、究極の目的であるためである。 Rather than not allowing water or the like to infiltrate from the joint between the waterproof tape 50a and the waterproof tape 50c, even if infiltration from the joint occurs, the light control layer 21 finally exposed at the end of the light control sheet 20 is protected. This is because the ultimate purpose is to prevent the moisture and the like from directly covering the light control layer 21.
継ぎ目からの水分などの浸入に伴う調光層２１への到達により危惧されるリスクが度外視できる程度であれば、製造上の容易さを重視する上では、図５（ｄ）の配置を採用しても良い。また、そのリスクを最大限に解消する上では、露出部分を粘着テープ７０で直接的に覆う配置に加えて、防水テープ５０ａと防水テープ５０ｃの端部同士が対向した箇所の上からさらに粘着テープ７０を被覆して接合する配置を採用しても良い。（図５（ｅ）） If the risk of being worried about reaching the light control layer 21 due to the intrusion of water or the like from the joint can be neglected, the arrangement of FIG. Is also good. Further, in order to eliminate the risk to the maximum, in addition to the arrangement in which the exposed portion is directly covered with the adhesive tape 70, the adhesive tape is further applied from above the position where the ends of the waterproof tape 50a and the waterproof tape 50c face each other. An arrangement in which 70 is covered and joined may be adopted. (Fig. 5(e))
１０…調光ユニット
２０…調光シート
２０Ｅ…端面
２０Ｆ…表面
２１…調光層
２２Ａ，２２Ｂ…透明電極層
２３Ａ，２３Ｂ…透明支持層
３０，３０Ａ，３０Ｂ…給電部
４０…支持基材
４０Ｆ…表面
５０，５０ａ，５０ｂ，５０ｃ，５０ｄ，５０ｅ，５０ｆ…防水テープ
５１，５１ａ，５１ｂ，５１ｃ…端面
５２，５２Ａ，５２Ｂ…給電箇所
６０…透明粘着層
７０…粘着テープ
10... Light control unit 20... Light control sheet 20E... End face 20F... Surface 21... Light control layer 22A, 22B... Transparent electrode layer 23A, 23B... Transparent support layer 30, 30A, 30B... Power feeding part 40... Support base material 40F... Surface 50, 50a, 50b, 50c, 50d, 50e, 50f... Waterproof tape 51, 51a, 51b, 51c... End face 52, 52A, 52B... Power feeding point 60... Transparent adhesive layer 70... Adhesive tape
Claims (4)
前記支持基材上において、前記調光シートは、その四辺の外縁に沿って延びて端面を覆う防水テープにより接着され、防水テープの継ぎ目は、別途に接着されてある粘着テープ上に前記粘着テープを覆うように配置された構成であり、
調光シートの端面を覆う防水テープの継ぎ目に用いられる粘着テープは、厚さが防水テープの１／２以下である調光ユニット。 A light control layer containing a liquid crystal composition, and a rectangular light control sheet having a pair of transparent electrode layers sandwiching the light control layer, and a supporting base material having an outer shape larger than the light control sheet,
On the supporting substrate, the light control sheet is adhered by a waterproof tape that extends along the outer edges of the four sides and covers the end face, and the seam of the waterproof tape is adhered onto the adhesive tape that is separately adhered. It is a configuration arranged to cover
The adhesive tape used for the joint of the waterproof tape covering the end surface of the light control sheet is a light control unit whose thickness is 1/2 or less of that of the waterproof tape.
粘着テープは、防水テープの基材の１／２以下の厚さの支持基材の両面に粘着層が形成された構成、または、前記支持基材に粘着剤が含浸された構成である請求項１記載の調光ユニット。 The waterproof tape has a structure in which an adhesive layer is formed on one side of the base material,
The pressure-sensitive adhesive tape has a structure in which a pressure-sensitive adhesive layer is formed on both sides of a supporting base material having a thickness of ½ or less of the base material of the waterproof tape, or a structure in which the supporting base material is impregnated with an adhesive. 1. The light control unit according to 1.
前記支持基材上において、前記調光シートは、その四辺の外縁に沿って延びて端面を覆う防水テープにより接着され、防水テープの継ぎ目は粘着テープにより覆われて接着された構成であり、
調光シートの端面を覆う防水テープの継ぎ目に用いられる粘着テープは、厚さが防水テープの１／２以下である調光ユニット。 A light control layer containing a liquid crystal composition, and a rectangular light control sheet having a pair of transparent electrode layers sandwiching the light control layer, and a supporting base material having an outer shape larger than the light control sheet,
On the support substrate, the light control sheet is a structure that is adhered by a waterproof tape that extends along the outer edges of the four sides and covers the end face, and the seam of the waterproof tape is covered and adhered by an adhesive tape,
The adhesive tape used for the joint of the waterproof tape covering the end surface of the light control sheet is a light control unit whose thickness is 1/2 or less of that of the waterproof tape.
粘着テープは、防水テープの基材の１／２以下の基材の片面に粘着層が形成された構成の請求項３記載の調光ユニット。 The waterproof tape has a structure in which an adhesive layer is formed on one side of the base material,
The light control unit according to claim 3, wherein the adhesive tape has a structure in which an adhesive layer is formed on one surface of a base material that is ½ or less of the base material of the waterproof tape.
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