JP7031152B2 - Dimming body - Google Patents
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Description
本発明は、電気的制御によって光の透過状態を制御する光学素子を備えた調光体に関し、特に、透明電極層付き透明基材へのリード線連結構造として好適な給電構造（電極構造）の改良された調光体に関する。
以降の説明においては、調光体，調光装置，調光シート，調光フィルムなど各種用語を混在して用いることもあるが、透明基材が、例えばガラス板，アクリル板などのリジッドな基材であったり、フレキシブルな樹脂フィルムであったり、フレキシブルな調光フィルムが厚さ，剛性確保のため、リジッドな基材に固定される（あるいは、挟持された合わせガラスの形態とされる）ことに起因する最終形態に伴う相違であり、本願発明ではそれらを同義語として取扱うものとする。
The present invention relates to a dimming body provided with an optical element that controls a light transmission state by electrical control, and is particularly suitable for a feeding structure (electrode structure) as a lead wire connecting structure to a transparent substrate with a transparent electrode layer. Regarding the improved dimming body.
In the following description, various terms such as a dimming body, a dimming device, a dimming sheet, and a dimming film may be used in combination, but the transparent base material is a rigid base such as a glass plate or an acrylic plate. A material, a flexible resin film, or a flexible dimming film is fixed to a rigid base material (or in the form of sandwiched laminated glass) to ensure thickness and rigidity. It is a difference due to the final form due to the above, and in the present invention, they are treated as synonyms.
不透明状態（あるいは白濁状態）と透明状態とを切り替える調光シートは様々な用途で用いられている。
例えば、調光シートは、電極間に保持された液晶層を備え、電極に印加する電圧により液晶層に含まれる液晶分子の配向状態を変化させて、入射した光を散乱する不透明状態と、入射した光を透過する透明状態とを切り替え可能に構成されている。（例えば、特許文献１参照）
調光シートは、例えばガラス等の透明基材に固定することにより、窓ガラスや展示ウィンドウ、間仕切りなどに採用することが可能となり、例えばプライベート空間とパブリック空間とを分離するため等、空間を分離する設備の他、自動車のサンルーフやサンバイザー用途としての利用についても提案されている。
A dimming sheet that switches between an opaque state (or a cloudy state) and a transparent state is used for various purposes.
For example, the dimming sheet includes a liquid crystal layer held between the electrodes, and changes the orientation state of the liquid crystal molecules contained in the liquid crystal layer by the voltage applied to the electrodes, and an opaque state that scatters the incident light and an incident state. It is configured to be able to switch between a transparent state that transmits light. (See, for example, Patent Document 1)
The dimming sheet can be used for windowpanes, exhibition windows, partitions, etc. by fixing it to a transparent base material such as glass. For example, to separate a private space and a public space, the space is separated. In addition to the equipment to be used, it is also proposed to be used as a sunroof or sun visor for automobiles.
調光体３０における電極（給電部）構造の一例では、図２に示すように、液晶層３３、並びに透明導電膜３５ａ及びＰＥＴフィルム３４ａが切り欠かれた調光体３０の一端に設けられ、露出した透明導電膜３５ｂの上に塗布された銀ペースト４０と、銀ペースト４０の上側に圧着されたピンコネクタ４１とから成る。ピンコネクタ４１は舌片状に延出する延出部４１ａを備え、ハンダ４２によってリード線４３が当該延出部４１ａに連結されている。（例えば、特許文献２参照）
In an example of the electrode (feeding portion) structure in the
舌片状の延出部４１ａを備えハンダ４２が自由端上にある不安定な構造に換えて、図３に示すように、上側の電極フィルム（イ）が切り欠かれて下側の電極フィルム（ロ）の透明導電膜が露出した表面に導電ペースト，導電テープを積層し（同図では、「導電テープ等」として単層で図示している）、ハンダ等を形成し、配線（リード線）に連結した構造の給電部（導電テープは舌片状に延出させない）も採用されている。
上側の電極フィルム（イ）側に形成される給電部は、上記の様に電極フィルム（ロ）側に形成された給電部とは重なり合わず離間した箇所に、同図を上下反転した状態で同様に形成される。
こうして電極フィルム（イ）（ロ）に付与された給電部から電圧が印加され、調光体の液晶駆動が行なわれる。
以下、図３において破線で囲まれる箇所（α）を「給電電極」と称して、調光体の電極フィルムに形成された透明導電膜による電極と差別することとする。
As shown in FIG. 3, the upper electrode film (a) is cut out and the lower electrode film is replaced with an unstable structure having a tongue-shaped extending
The feeding portion formed on the upper electrode film (a) side does not overlap with the feeding portion formed on the electrode film (b) side as described above, and is separated from the feeding portion. It is formed in the same way.
In this way, a voltage is applied from the feeding portion applied to the electrode films (a) and (b) to drive the liquid crystal display of the dimmer.
Hereinafter, the portion (α) surrounded by the broken line in FIG. 3 is referred to as a “feeding electrode” to be distinguished from the electrode formed by the transparent conductive film formed on the electrode film of the dimming body.
図４は、図３に示す給電電極の平面図である。
図４（ａ）の平面図では、調光体における同図下端部に帯状の接続領域に給電電極が形成される。
給電電極は、紙面手前側の電極フィルムを帯状に切り欠いて（断裁～剥離）、露出した紙面奥側の電極フィルムに形成された透明導電膜表面に導電ペースト，導電テープを積層し（同図では、導電ペースト，導電テープを単一部材として図示している）、帯状の導電テープ上の略中央部にハンダを形成し、配線（リード線）に連結した構造である。
同図上端部には、対向透明導電膜（紙面の手前側）に接続される帯状の接続領域に形成される給電電極が点線で図示される。
各帯状の接続領域は、図４（ａ）の様に、調光体の対辺同士に形成しても良く、図４（ｂ）の様に、同一辺であっても表裏で重なり合わない様に、左右端部との余白，接続領域同士の間隔を適度に保って配置しても良い。端部との額縁状の余白は、フレームに装着，合わせガラス形態とする際の封止部の加工をする上で必要となる。
FIG. 4 is a plan view of the feeding electrode shown in FIG.
In the plan view of FIG. 4A, a feeding electrode is formed in a band-shaped connection region at the lower end of the dimming body.
For the feeding electrode, the electrode film on the front side of the paper surface is cut out in a band shape (cutting to peeling), and the conductive paste and the conductive tape are laminated on the surface of the transparent conductive film formed on the exposed electrode film on the back side of the paper surface (the same figure). The conductive paste and the conductive tape are shown as a single member), and the solder is formed in the substantially central portion on the strip-shaped conductive tape and connected to the wiring (lead wire).
At the upper end of the figure, a feeding electrode formed in a band-shaped connection region connected to the opposed transparent conductive film (front side of the paper surface) is shown by a dotted line.
As shown in FIG. 4A, the strip-shaped connection regions may be formed on opposite sides of the dimming body, and as shown in FIG. 4B, even if they are on the same side, they do not overlap on the front and back sides. In addition, the margins between the left and right ends and the distance between the connection areas may be maintained appropriately. A frame-shaped margin with the end is required to process the sealing part when it is attached to the frame and made into a laminated glass form.
接続領域サイズは図４（ａ）の様に、調光体内部で液晶層が挟持された領域サイズ（矩形の調光体シートの左右一辺）の１００％近くに渡る長さであっても、図４（ｂ）の様に、調光体シートの一辺長さの１／２未満であっても、リード線が半田接合されるポイントを僅かに超える程度（＞０％）であっても良い。
接続領域サイズが小さい場合には、図１（ａ）の様に紙面手前側の透明導電フィルム（イ）の下端部を幅方向（左右）の全てに渡って断裁～剥離して、液晶層，透明電極を露出させる必要はなく、給電電極部の形成に必要なサイズで透明導電フィルムを断裁～除去すれば良い。対向透明電極に接続領域を形成する際の透明導電フィルム（ロ）の断裁～剥離の取扱いの上でも同様である。
Even if the connection area size is close to 100% of the area size (the left and right sides of the rectangular dimming body sheet) in which the liquid crystal layer is sandwiched inside the dimming body as shown in FIG. 4A. As shown in FIG. 4B, the length may be less than 1/2 of the length of one side of the dimmer sheet, or may be slightly more than the point where the lead wires are soldered (> 0%). ..
When the connection area size is small, the lower end of the transparent conductive film (a) on the front side of the paper surface is cut and peeled off in the entire width direction (left and right) as shown in FIG. 1 (a) to form a liquid crystal layer. It is not necessary to expose the transparent electrode, and the transparent conductive film may be cut or removed to a size required for forming the feeding electrode portion. The same applies to the handling of cutting and peeling of the transparent conductive film (b) when forming the connection region on the facing transparent electrode.
図４（ａ）（ｂ）に示される様に、給電電極の形成箇所では、透明導電フィルムの断裁～除去に応じて露出する透明導電膜表面の形状は矩形である。
また、透明導電膜表面に形成される導電テープ等（導電ペースト，導電テープ）の形状も矩形である。
As shown in FIGS. 4A and 4B, the shape of the transparent conductive film surface exposed by cutting and removing the transparent conductive film is rectangular at the portion where the feeding electrode is formed.
Further, the shape of the conductive tape or the like (conductive paste, conductive tape) formed on the surface of the transparent conductive film is also rectangular.
矩形の透明導電膜，導電テープ等（導電ペースト，導電テープ）を有する給電電極から調光体の駆動電圧を印加することで、矩形の角（直角の隅）での電気抵抗が上昇し、角部の温度が上昇するにことに伴い、液晶層の変性を招いたり、消費電力の増大を招くという問題が発生する。
ＩＴＯ：１．５～２．０×１０－４[Ωｃｍ]，銅：１．６８ ×１０－７ [Ωｃｍ]に例示される相違の通り、透明導電膜（前者）は、不透明な金属導電材料（後者）に比べて電気抵抗が高く、導通箇所の形状，厚さに応じた表面抵抗率（シート抵抗）の変動が顕著であることは公知である。
By applying the driving voltage of the dimmer from the feeding electrode having a rectangular transparent conductive film, conductive tape, etc. (conductive paste, conductive tape), the electrical resistance at the corners of the rectangle (the corners at right angles) increases, and the corners As the temperature of the part rises, there arises a problem that the liquid crystal layer is denatured and the power consumption is increased.
As shown in the differences exemplified in ITO: 1.5 to 2.0 × 10 -4 [Ωcm] and copper: 1.68 × 10-7 [Ωcm], the transparent conductive film (the former) is an opaque metallic conductive material. It is known that the electrical resistance is higher than that of the (latter), and the surface resistivity (sheet resistance) fluctuates remarkably according to the shape and thickness of the conducting portion.
本発明は、給電電極部の形状に依存した電気抵抗の上昇に伴う液晶層の変性（表示品位の低下），消費電力の増大を回避した調光体を提供することを目的とする。 An object of the present invention is to provide a dimming body that avoids deformation of the liquid crystal layer (decrease in display quality) and increase in power consumption due to an increase in electrical resistance depending on the shape of the feeding electrode portion.
本発明の調光体は、
印加電圧に応じてヘイズを２種類以上に切替可能な調光層が、前記調光層に電圧を印加する透明導電膜が形成された透明基材に挟持されてなる構成であり、前記調光層は、三次元の網目状に形成された樹脂からなるポリマーネットワークの内部に形成された空隙内に液晶分子が配置されるか、またはポリマー中に分散配置される液晶分子を有している構造の液晶材料からなる調光体において、
調光体の端部に、一方の透明基材が切り欠かれて露出した透明導電膜上への電気的接続のための給電電極部は、透明導電膜が露出した表面に少なくとも導電テープが貼着され、前記テープ上に形成したハンダを介してリード線に連結する構造であり、透明基材の断裁形状に応じて露出する透明導電膜表面の形状は、曲率半径を有する非直角の頂部を有していることを特徴とする。
The dimming body of the present invention is
A dimming layer capable of switching between two or more types of haze according to the applied voltage is sandwiched between transparent substrates on which a transparent conductive film that applies a voltage to the dimming layer is formed, and the dimming is performed. The layer has a structure in which liquid crystal molecules are arranged in voids formed inside a polymer network made of a resin formed in a three-dimensional network, or liquid crystal molecules are dispersed in the polymer. In a dimming body made of liquid crystal material of
At the end of the dimming body, at least a conductive tape is attached to the exposed surface of the transparent conductive film at the feeding electrode part for electrical connection on the transparent conductive film exposed by cutting out one of the transparent substrates. It is a structure that is attached and connected to a lead wire via a solder formed on the tape, and the shape of the transparent conductive film surface exposed according to the cut shape of the transparent base material is a non-rectangular top having a radius of curvature. It is characterized by having.
曲率半径（Ｒ）としては、給電部を形成する領域全体（または、導電ペーストや導電テープ）の形状を矩形と見た場合、その短辺長さ（α）以下であれば良い。
好ましくは、前記短辺長さ（α）の２０％であることが取扱形状および加工適正から好ましい。
The radius of curvature (R) may be less than or equal to the short side length (α) when the shape of the entire region (or conductive paste or conductive tape) forming the feeding portion is regarded as a rectangle.
It is preferable that the short side length (α) is 20% from the viewpoint of handling shape and processing suitability.
給電電極部を構成する導電要素（透明導電膜，導電ペースト，導電テープ）の少なくとも何れかの形状が、曲率半径を有する非直角の頂部を有していることにより、給電電極部から調光体の駆動電圧を印加した際、前記導電要素内での表面抵抗の上昇を伴わず、給電電極部での温度上昇，液晶層の変性，消費電力の増大を招くという問題が解消される。 Since at least one of the shapes of the conductive elements (transparent conductive film, conductive paste, conductive tape) constituting the feeding electrode portion has a non-rectangular top having a radius of curvature, the dimming body is formed from the feeding electrode portion. When the driving voltage of the above is applied, the problem that the surface resistance in the conductive element does not increase, the temperature at the feeding electrode portion increases, the liquid crystal layer is denatured, and the power consumption increases is solved.
以下、本発明の実施形態について図示を用いて説明するが、本発明は以下の図示・説明によって限定されるものではない。
図１は本発明による調光体における電極（給電部）構造例を示す説明図であり、（ａ）が給電電極部を含む調光体全体を示す平面図，（ｂ）が給電電極部を構成する透明導電膜の形状を示す拡大図である。
Hereinafter, embodiments of the present invention will be described with reference to illustrations, but the present invention is not limited to the following illustrations and explanations.
1A and 1B are explanatory views showing an example of an electrode (feeding portion) structure in a dimming body according to the present invention, in which (a) is a plan view showing the entire dimming body including the feeding electrode portion, and (b) is a feeding electrode portion. It is an enlarged view which shows the shape of the transparent conductive film which constitutes.
本発明では、調光層として、三次元の網目状に形成された樹脂からなるポリマーネットワークの内部に形成された空隙内に液晶分子が配置されたタイプのＰＮＬＣ（ポリマーネットワーク液晶）、またはポリマー中に分散配置される液晶分子を有するタイプのＰＤＬＣ（高分子分散液晶）の何れかを採用する。
以下、ＰＮＬＣで代表して本実施形態を説明する。
In the present invention, as a dimming layer, a type of PNLC (polymer network liquid crystal) in which liquid crystal molecules are arranged in voids formed inside a polymer network made of a resin formed in a three-dimensional network, or in a polymer. Any of the types of PDLC (polymer dispersed liquid crystal) having liquid crystal molecules dispersed and arranged in the above is adopted.
Hereinafter, this embodiment will be described on behalf of PNLC.
＜ＰＮＬＣによる調光体＞
ＰＮＬＣからなる調光層を具備する調光体（フィルム）の製造にあたっては、液晶と光重合性化合物（モノマー）との混合物を一対の透明電極基板（透明導電膜の形成された透明基板）の間に挟み、一定の条件下で紫外線を照射し、光重合によって光重合性化合物が高分子に変化すると共に、光重合および架橋結合により、微細なドメイン（高分子の空隙）を無数に有するポリマーネットワークが液晶中に形成する。
<Dimmer by PNLC>
In the production of a light control body (film) having a light control layer made of PNLC, a mixture of a liquid crystal and a photopolymerizable compound (monomer) is used as a pair of transparent electrode substrates (transparent substrate on which a transparent conductive film is formed). A polymer that is sandwiched between them and irradiated with ultraviolet rays under certain conditions to change the photopolymerizable compound into a polymer by photopolymerization, and also has innumerable fine domains (polymer voids) by photopolymerization and cross-linking. A network is formed in the liquid crystal.
ＰＮＬＣの駆動電圧は、一般にポリマーネットワークの構造上の特性（ドメインの大きさや形状，ポリマーネットワークの膜厚など）に依存しており、ポリマーネットワークの構造と、得られる光透過／散乱度との関係において、駆動電圧が決定されている。
１００Ｖ以下の電圧領域において、十分な光透過／散乱度が得られるようなＰＮＬＣを構成するには、各ドメインがいずれも適正な大きさで均一となるように、かつ、形状も均一となるようにポリマーネットワークを形成する必要がある。
本発明では、ポリマーネットワーク構造に依存するドメインサイズを３μｍ以下、好ましくは２μｍ以下、一層好ましくは０．３～１．７μｍのサイズとなる様に制御する。
The drive voltage of the PNLC generally depends on the structural characteristics of the polymer network (domain size and shape, film thickness of the polymer network, etc.), and the relationship between the structure of the polymer network and the obtained light transmission / scattering degree. In, the drive voltage is determined.
In order to construct a PNLC that can obtain sufficient light transmission / scattering degree in the voltage region of 100 V or less, each domain should be uniform in size and uniform in shape. It is necessary to form a polymer network.
In the present invention, the domain size depending on the polymer network structure is controlled to be 3 μm or less, preferably 2 μm or less, and more preferably 0.3 to 1.7 μm.
製造方法の詳細については、九州ナノテック光学株式会社による特許第４３８７９３１号に説明されており、本発明の実施形態においても、調光体となる液晶素子の製造は前記特許に準拠したプロセスを採用する。前記プロセスは、上述した「サイズや方向性の制御されたネットワーク構造」の設計～製造の上で非常に有効である。 The details of the manufacturing method are described in Japanese Patent No. 4387931 by Kyusyu Nanotec Optical Co., Ltd., and also in the embodiment of the present invention, the manufacturing of the liquid crystal element to be a dimming body adopts the process according to the above patent. .. The process is very effective in designing and manufacturing the above-mentioned "network structure with controlled size and direction".
本実施形態による調光体では、ＰＮＬＣからなる調光層と透明導電フィルム（透明導電膜の形成された透明基板）とを備えている。
透明導電フィルムは、調光層（ＰＮＬＣ）を挟持しており、調光層（ＰＮＬＣ）に電圧を印加して、高ヘイズ（散乱状態），低ヘイズ（透過状態）を変化させる。
The dimming body according to the present embodiment includes a dimming layer made of PNLC and a transparent conductive film (a transparent substrate on which a transparent conductive film is formed).
The transparent conductive film sandwiches a light control layer (PNLC), and a voltage is applied to the light control layer (PNLC) to change high haze (scattering state) and low haze (transmission state).
透明導電フィルムは、フィルム基材上に透明な導電材料からなる透明電極を成膜してなる透明導電フィルムを互いの透明電極側を対向して調光層を挟持する。
透明導電フィルムを構成する透明基材には、ポリエチレンテレフタレート（ＰＥＴ）フィルム，ポリエチレン（ＰＥ）フィルム，ポリカーボネート（ＰＣ）フィルムなどを用いることができる。透明基材の厚みは、約５０～２００μｍ程度が望ましい。
透明電極（透明導電膜）には、一般的にＩＴＯなどの金属酸化物が用いられるが、ＩＴＯに替えて低抵抗の導電性ポリマーを採用することも可能である。導電性ポリマーとしては、ＰＥＤＯＴ／ＰＳＳに例示されるπ共役系導電性高分子にドープされたポリアニオンを含む材料の採用が好適である。
透明電極の好適な厚さは略８０ｎｍ以上１５０ｎｍ以下である。
尚、ＰＮＬＣでは印加電圧に応じて、０／１以外の中間調のヘイズ状態を表現することも可能である。
In the transparent conductive film, a transparent conductive film formed by forming a transparent electrode made of a transparent conductive material on a film substrate faces each other on the transparent electrode sides and sandwiches a dimming layer.
As the transparent base material constituting the transparent conductive film, a polyethylene terephthalate (PET) film, a polyethylene (PE) film, a polycarbonate (PC) film or the like can be used. The thickness of the transparent substrate is preferably about 50 to 200 μm.
A metal oxide such as ITO is generally used for the transparent electrode (transparent conductive film), but it is also possible to use a low resistance conductive polymer instead of ITO. As the conductive polymer, it is preferable to use a material containing a polyanion doped in a π-conjugated conductive polymer exemplified by PEDOT / PSS.
The suitable thickness of the transparent electrode is approximately 80 nm or more and 150 nm or less.
In PNLC, it is also possible to express a haze state of a halftone other than 0/1 according to the applied voltage.
本発明は、光散乱（白濁）系から電圧を印加（ＯＮ）にすることで透明状態へ変化するノーマルモード方式に加えて、電圧の印加で透明から白濁系へと状態が変化するリバースモード方式にも適用可能である。
リバースタイプの調光層（ＰＮＬＣ）を具備する調光体では、調光層の上側の透明導電フィルムの間に配向膜を積層するとともに、調光層の下側の透明導電フィルムの間にも配向膜が積層される。（図示せず）
In the present invention, in addition to the normal mode method that changes to a transparent state by applying (ON) a voltage from a light scattering (white turbidity) system, the reverse mode method that changes the state from transparent to a cloudy state by applying a voltage. It is also applicable to.
In a light control body provided with a reverse type light control layer (PNLC), an alignment film is laminated between the transparent conductive films on the upper side of the light control layer, and also between the transparent conductive films on the lower side of the light control layer. The alignment film is laminated. (Not shown)
ポリマーネットワーク及び液晶分子は、一対の配向膜の間に配置されている。
配向膜は、いわゆる垂直配向膜であり、調光層２に電圧を印加していないときに、液晶分子の長手方向が配向膜の法線方向に沿うように、当該液晶分子を配向する。このため、リバースタイプの調光層（ＰＮＬＣ）は、電圧を印加していないときに低ヘイズ状態となり、透過性が高くなる。
The polymer network and liquid crystal molecules are arranged between a pair of alignment films.
The alignment film is a so-called vertical alignment film, and when no voltage is applied to the light control layer 2, the liquid crystal molecules are oriented so that the longitudinal direction of the liquid crystal molecules is along the normal direction of the alignment film. Therefore, the reverse type dimming layer (PNLC) is in a low haze state when no voltage is applied, and the transparency is high.
＜給電電極部＞
本実施形態による給電電極部の形成にあたっては、露出させる透明導電膜表面の形状を、曲率半径を有する非直角の頂部を有している形状に加工する。
上記形状での加工にあたり、カッターなど機械的な断裁手段，レーザー断裁手段が適宜選定される。
上記形状で露出させた透明導電膜表面に給電電極部を形成するにあたっては、液状で残存する調光層（ＰＮＬＣ）を拭き取り、導通性を確保した状態の表面に、少なくとも帯状の導電ペースト，導電テープを順次積層し、導電テープ上の略中央部にハンダを形成し、配線（リード線）に連結する。
<Feeding electrode section>
In forming the feeding electrode portion according to the present embodiment, the shape of the surface of the transparent conductive film to be exposed is processed into a shape having a non-right-angled top having a radius of curvature.
Mechanical cutting means such as a cutter and laser cutting means are appropriately selected for processing in the above shape.
In forming the feeding electrode portion on the surface of the transparent conductive film exposed in the above shape, the light control layer (PNLC) remaining in the liquid state is wiped off, and at least a band-shaped conductive paste or conductive material is formed on the surface in a state where conductivity is ensured. The tapes are sequentially laminated, solder is formed in a substantially central portion on the conductive tape, and the tapes are connected to the wiring (lead wire).
ＩＴＯ，ＩＺＯ，有機導電膜からなる透明導電膜は、ハンダに接着しないため、ハンダ付が可能となる様に、透明導電膜上に金属メッキ層（Ｎｉが代表的）を形成したり、導電性接着剤による厚膜層を形成するなどの中継的役割を担う端子処理が必要となっている。
工程，部材を低減した構成としては、透明導電膜上に導電テープを貼着し、ハンダ付けが行なわれる構成が好ましい。
本実施形態では、透明導電膜上に、導電ペースト，導電テープを順次積層する。
導電ペーストとしては、透明導電膜との密着性が良い材料であれば何でもよいが、例えば銀ペーストを用いることができる。導電テープとしては、例えば銅テープを用いることができる。
Since the transparent conductive film composed of ITO, IZO, and an organic conductive film does not adhere to solder, a metal plating layer (typically Ni) is formed on the transparent conductive film so that soldering is possible, or conductivity is provided. Terminal treatment that plays a relay role, such as forming a thick film layer with an adhesive, is required.
As a configuration in which the number of steps and members is reduced, a configuration in which a conductive tape is attached on a transparent conductive film and soldered is preferable.
In the present embodiment, the conductive paste and the conductive tape are sequentially laminated on the transparent conductive film.
The conductive paste may be any material as long as it has good adhesion to the transparent conductive film, and for example, a silver paste can be used. As the conductive tape, for example, a copper tape can be used.
ハーフカット（一方の透明導電フィルムの断裁）の形状に応じて、透明導電膜自体が成膜された形状には変化がなく全面でベタなままであるが、透明導電膜の露出部分の形状は変わり、対向する他方の導電フィルム（挟持される液晶層との接触箇所）との接触箇所の形状が変わることで、シート抵抗値が下がることになる。
本実施形態においては、導電ペースト，導電テープでも、帯状形状に形成する際、直角の角を持つ矩形でなく、４角に曲率半径（Ｒ）を持たせることも好ましい。
Depending on the shape of the half-cut (cutting of one of the transparent conductive films), the shape of the transparent conductive film itself does not change and remains solid on the entire surface, but the shape of the exposed part of the transparent conductive film remains solid. By changing the shape of the contact point with the other conductive film (contact point with the sandwiched liquid crystal layer), the sheet resistance value is lowered.
In the present embodiment, it is also preferable that the conductive paste and the conductive tape also have a radius of curvature (R) at four corners instead of a rectangle having right-angled corners when formed into a strip shape.
上記のように形成された給電電極部において、外部電源から調光体に給電を行なうリード線を銅テープ上で半田接続した後、半田部分と上記接続領域を覆う状態で電極保護層を形成する。
半田接続にあたっては、鉛フリー半田（加熱温度＝約２００℃），加熱温度の低い超音波半田など、半田の種類は適宜選択される。
電極保護層の材料としては、紫外線硬化性エポキシ樹脂あるいは紫外線硬化性アクリル樹脂が短時間で硬化させることが可能であり好適である。
電極保護層に要求される特性として、絶縁性，耐水性（電蝕防止），機械的強度，保護対象との密着性が挙げられ、重視する目的に応じて適宜選択される。
In the power feeding electrode portion formed as described above, a lead wire that supplies power to the light control body from an external power source is solder-connected on a copper tape, and then an electrode protection layer is formed so as to cover the solder portion and the connection region. ..
For solder connection, the type of solder, such as lead-free solder (heating temperature = about 200 ° C.) and ultrasonic solder with a low heating temperature, is appropriately selected.
As a material for the electrode protective layer, an ultraviolet curable epoxy resin or an ultraviolet curable acrylic resin can be cured in a short time and is suitable.
The characteristics required for the electrode protective layer include insulation, water resistance (prevention of electrolytic corrosion), mechanical strength, and adhesion to the object to be protected, and are appropriately selected according to the purpose to be emphasized.
一対の透明導電フィルム（ＩＴＯの成膜されたＰＥＴフィルム）の透明導電膜側同士を対向させた間にＰＮＬＣが挟持されてなる調光フィルム（Ａ４サイズ）に、以下の様に給電電極部を形成した。 The feeding electrode portion is attached to a light control film (A4 size) in which PNLC is sandwiched between a pair of transparent conductive films (PET films on which ITO is formed) so that the transparent conductive films are opposed to each other. Formed.
透明導電フィルムの一方にレーザープリンタ（（株）ユニバーサルレーザーシステムズ)でＡ４サイズの端部（図１（ａ）の左下に示す位置）に、短辺１０ｍｍ×長辺１００ｍｍの矩形状に切り込み（ハーフカット）を入れ、透明導電フィルムを剥離して切り欠け部を形成した。
矩形の４角のうち、右側２つの頂部ではＲ＝２ｍｍの曲率半径を有するカーブで断裁した。（図１（ｂ）参照）
A laser printer (Universal Laser Systems Co., Ltd.) cuts one side of the transparent conductive film into a rectangular shape with a short side of 10 mm and a long side of 100 mm at the end of A4 size (the position shown in the lower left of FIG. 1A). (Cut) was put in, and the transparent conductive film was peeled off to form a notched portion.
Of the four corners of the rectangle, the two tops on the right side were cut with a curve having a radius of curvature of R = 2 mm. (See FIG. 1 (b))
切り欠いた透明導電フィルムの剥離により露出したＰＮＬＣ層をイソプロピルアルコール，酢酸エチル，トルエン等の適宜な溶媒で除去し、透明導電膜（ＩＴＯ）を露出させ、３０μｍ厚の両面導電テープ（寺岡製作所製Ｎｏ．７７４２）を貼合し、その上に銅フィルム（三井金属製３ＥＣ－ＨＴＥ）を貼合し給電電極部を形成した。 The PNLC layer exposed by peeling off the notched transparent conductive film is removed with an appropriate solvent such as isopropyl alcohol, ethyl acetate, toluene, etc. to expose the transparent conductive film (ITO), and a 30 μm thick double-sided conductive tape (manufactured by Teraoka Seisakusho). No. 7742) was bonded, and a copper film (3EC-HTE manufactured by Mitsui Metal Co., Ltd.) was bonded thereto to form a feeding electrode portion.
他方の透明導電フィルムでの給電電極部の形成では、金属刃でＡ４サイズの端部（図１（ａ）の右下に示す位置）に、短辺１０ｍｍ×長辺１００ｍｍの矩形状に切り込み（ハーフカット）を入れ、透明導電フィルムを剥離して切り欠け部を形成した。
矩形の４角のうち、２つの頂部ではＲ＝２ｍｍの曲率半径を有するカーブで断裁した。
切り欠いた透明導電フィルムの剥離後、同様に給電電極部を形成した。
In the formation of the feeding electrode portion with the other transparent conductive film, a metal blade cuts into an A4 size end (position shown in the lower right of FIG. 1A) in a rectangular shape having a short side of 10 mm and a long side of 100 mm (the position shown in the lower right of FIG. 1A). (Half cut) was inserted, and the transparent conductive film was peeled off to form a notched portion.
Of the four corners of the rectangle, two tops were cut with a curve having a radius of curvature of R = 2 mm.
After peeling off the notched transparent conductive film, a feeding electrode portion was formed in the same manner.
＜対比評価＞
給電電極部に曲率半径（Ｒ）を持たせる加工を施した実施例に係る調光体と、給電電極部が直角の４角のみからなること以外は同一条件で作製した従来製品に係る調光体を用意し、共に交流電圧４０Ｖを印加し、１ヶ月間透明状態で放置した後、両者を観察した。
従来製品に係る調光体では、給電電極部周囲の温度が上昇し、遮光状態（電圧ＯＦＦ）で給電電極部の周囲１ｍｍ程度が透明になったのに対して、実施例に係る調光体では、給電電極部の温度上昇も確認されず、遮光状態（電圧ＯＦＦ）で給電電極部周囲も問題なく遮光（散乱）状態が良好に維持されていた。
尚、本発明の他実施例として、図１（ｃ）に示す様に、矩形の４角の全てに曲率半径（Ｒ）を持たせる加工を施すことや、更には透明導電膜上に貼合する両面導電テープ，銅フィルムの少なくとも一方にも矩形の４角の少なくとも何れかに曲率半径（Ｒ）を持たせる加工を施すことにより、矩形の角（直角の隅）での電気抵抗が上昇することを抑制する上での効果が一層向上する。
<Comparison evaluation>
The dimming body according to the embodiment in which the feeding electrode portion is processed to have a radius of curvature (R) and the dimming according to the conventional product manufactured under the same conditions except that the feeding electrode portion is composed of only four right-angled squares. A body was prepared, an AC voltage of 40 V was applied to both of them, and the mixture was left in a transparent state for one month, and then both were observed.
In the dimming body according to the conventional product, the temperature around the feeding electrode portion rises, and the circumference of the feeding electrode portion becomes transparent by about 1 mm in a light-shielded state (voltage OFF), whereas the dimming body according to the embodiment becomes transparent. Then, the temperature rise of the feeding electrode portion was not confirmed, and the light shielding state (scattering) was well maintained around the feeding electrode portion without any problem in the light shielding state (voltage OFF).
As another embodiment of the present invention, as shown in FIG. 1 (c), all four corners of the rectangle are processed to have a radius of curvature (R), and further, they are bonded onto a transparent conductive film. By processing at least one of the double-sided conductive tape and the copper film to have a radius of curvature (R) at at least one of the four rectangular corners, the electrical resistance at the rectangular corner (right-angled corner) increases. The effect of suppressing this is further improved.
３０ 調光体
３３ 液晶層
３４（ａ，ｂ） ＰＥＴフィルム
３５（ａ，ｂ） 透明導電膜
４０ 銀ペースト
４１ ピンコネクタ
４１ａ 延出部
４２ ハンダ
４３ リード線
30
Claims (3)
前記調光体の端部にあり、一方の透明基材が切り欠かれて露出した透明導電膜上への電気的接続のための給電電極部は、前記透明基材の断裁形状に応じて露出する前記透明導電膜表面の４角の形状がすべて曲率半径を有する非直角の頂部を有していることを特徴とする調光体。 A dimming layer capable of switching between two or more types of haze according to the applied voltage is sandwiched between transparent substrates on which a transparent conductive film that applies a voltage to the dimming layer is formed, and the dimming is performed. The layer has a structure in which liquid crystal molecules are arranged in voids formed inside a polymer network made of a resin formed in a three-dimensional network, or liquid crystal molecules are dispersed in the polymer. In a dimming body made of liquid crystal material of
The feeding electrode portion for electrical connection on the transparent conductive film exposed by cutting out one of the transparent substrates at the end of the dimming body is exposed according to the cut shape of the transparent substrate. A dimming body characterized in that all four corner shapes of the surface of the transparent conductive film have a non-rectangular top having a radius of curvature.
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