JP4721359B2 - 透明導電性積層体及びそれを備えたタッチパネル - Google Patents
透明導電性積層体及びそれを備えたタッチパネル Download PDFInfo
- Publication number
- JP4721359B2 JP4721359B2 JP2006247001A JP2006247001A JP4721359B2 JP 4721359 B2 JP4721359 B2 JP 4721359B2 JP 2006247001 A JP2006247001 A JP 2006247001A JP 2006247001 A JP2006247001 A JP 2006247001A JP 4721359 B2 JP4721359 B2 JP 4721359B2
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- transparent conductive
- thin film
- transparent
- film
- conductive thin
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Classifications
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/045—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/14—Non-insulated conductors or conductive bodies characterised by their form comprising conductive layers or films on insulating-supports
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
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Description
透明なフィルム基材の他方の面には、透明な粘着剤層を介して透明基体が貼り合わされている透明導電性積層体であって、
透明導電性薄膜は、SnO2/(SnO2+In2O3)が2〜6重量%であるインジウム・スズ複合酸化物からなる第1の透明導電性薄膜と、SnO2/(SnO2+In2O3)が6重量%を超え、20重量%以下であるインジウム・スズ複合酸化物からなる第2の透明導電性薄膜とが、透明なフィルム基材の側からこの順に形成されてなり、上記第1の透明導電性薄膜の厚さt1と第2の透明導電性薄膜の厚さt2とが、以下の(1)〜(3);
(1)t1=10〜30nm
(2)t2= 5〜20nm
(3)t1+t2=20〜35nm
の関係を有すると共に、上記第1の透明導電性薄膜と第2の透明導電性薄膜とがいずれも結晶膜であり、
透明基体は、少なくとも2枚の透明な基体フィルムを透明な粘着剤層を介して積層した積層透明基体であることを特徴とする透明導電性積層体、に関する。
(1)t1=10〜30nm、好ましくは10〜20nm、
(2)t2=5〜20nm、好ましくは5〜15nm、
(3)t1+t2=20〜35nm、好ましくは25〜30nm、
の関係を有する必要があり、このような厚さ関係としたときにのみ、低温短時間の熱処理による結晶化が可能で透明性およびペン入力耐久性に加えて、面圧耐久性に優れ、高温高湿度信頼性にも優れた透明導電性薄膜を形成することができる。
<透明導電性薄膜の形成>
厚さが25μmのポリエチレンテレフタレートフィルム(以下、PETフィルムという)からなるフィルム基材の一方の面に、アンダーコート層(透明な誘電体薄膜)として、メラミン樹脂:アルキド樹脂:有機シラン縮合物の重量比2:2:1の熱硬化型樹脂(光の屈折率n=1.54)を厚さが30nmとなるように形成した。
ハードコート層の形成材料として、アクリル・ウレタン系樹脂(大日本インキ化学(株)製のユニディック17−806)100部に、光重合開始剤としてのヒドロキシシクロヘキシルフェニルケトン(チバスペシャルティケミカルズ社製のイルガキュア184)5部を加えて、30%の濃度に希釈してなるトルエン溶液を調製した。
次いで、前記基体フィルムのハードコート層形成面とは反対側の面に、厚さ約20μm、弾性係数10N/cm2の透明なアクリル系の粘着剤層を形成した。粘着剤層組成物としては、アクリル酸ブチルとアクリル酸と酢酸ビニルとの重量比が100:2:5のアクリル系共重合体100部に、イソシアネート系架橋剤を1部配合してなるものを用いた。上記粘着剤層側に、厚さ25μmのPETフィルムからなる基体フィルムを貼り合せて、PETフィルムを2枚有する積層透明基体とした。
上記積層透明基体のハードコート層形成面とは反対側の面に、上記同様条件にて粘着剤層を形成し、この粘着剤層面と、フィルム基材(導電性薄膜を形成していない側の面)とを貼り合わせ、これにより本実施例に係る透明導電性積層体を作製した。
実施例1<透明導電性薄膜の形成>における、第1の透明導電性薄膜の形成において、酸化インジウム97重量%、酸化スズ3%の焼結体材料を用いたこと以外は、実施例1と同様にして、透明導電性積層板を作製した。
実施例1<透明導電性薄膜の形成>において、アンダーコート層として、メラミン樹脂:アルキド樹脂:有機シラン縮合物の重量比2:2:1の熱硬化型樹脂(光の屈折率n=1.54)を厚さが200nmとなるように形成し、次いで、当該熱硬化型樹脂層上に、厚さが30nmのSiO2膜(光の屈折率1.46)をシリカコート法により形成したものを用いたこと以外は、実施例1と同様にして、透明導電性積層板を作製した。SiO2膜の形成は、シリカゾル(コルコート社製の「コルコートP」)を固形分濃度が2%となるようにエタノールで希釈し、上記の熱硬化型樹脂層上に塗布後、150℃で2分間乾燥後、硬化させることにより形成したこと以外は、実施例1と同様にして、透明導電性積層板を作製した。
実施例1において、積層透明基体の代わりに、透明基体として、厚さが125μmのPETフィルムからなる基体フィルムにハードコート層を形成したもの(実施例1の積層透明基体において、厚さ25μmのPETフィルムからなる基体フィルムを貼り合せていないもの)を用いたこと以外は実施例1と同様にして、透明導電性積層体を作製した。
実施例2において、積層透明基体の代わりに、透明基体として、厚さが125μmのPETフィルムからなる基体フィルムにハードコート層を形成したもの(実施例1の積層透明基体において、厚さ25μmのPETフィルムからなる基体フィルムを貼り合せていないもの)を用いたこと以外は実施例2と同様にして、透明導電性積層体を作製した。
実施例及び比較例で得られた各透明導電性積層体をパネル板とし、他方のパネル板(下側基板)として、ガラス板上に厚さ20nmのインジウム・スズ複合酸化物(酸化インジウム95%と酸化スズ5%)からなる透明導電性薄膜を前記と同様の方法で形成した透明導電性ガラスを用い、この両パネル板を、透明導電性薄膜同士が対向するように、10μmのスペーサーを介して対向配置し、スイッチ構体としてのタッチパネルをそれぞれ作製した。尚、両パネル板の各透明導電性薄膜は、前記の対向配置に先立って、予め互いに直交するように銀電極を形成した。
屈折率は、アタゴ社製のアッベ屈折率計を用い、各種測定面に対して測定光を入射させるようにして、該屈折計に示される規定の測定方法により測定を行った。
フィルム基材、基体フィルム、ハードコート層、粘着剤層等の1μm以上の厚みを有するものに関しては、ミツトヨ製マイクロゲージ式厚み計にて測定を行った。ハードコート層、粘着剤層等の直接厚みを計測することが困難な層の場合は、各層を設けた基材の総厚みを測定し、基材の厚みを差し引くことで各層の膜厚を算出した。
二端子法を用いて、各タッチパネルに於けるITO膜の表面電気抵抗(Ω/□)を測定した。
島津製作所製の分光分析装置UV−240を用いて、光波長550nmに於ける可視光線透過率を測定した。
高温高湿信頼性として、85℃、85%RHの雰囲気下で500時間、放置する試験を行った。試験前の表面抵抗値(Ro)に対する試験後の表面抵抗値(R)の変化率〔つまり、R/Ro〕を求めて、高温高湿信頼性を評価した。
図4に示すように、面圧耐久性試験用冶具(接地径φ20mm)が荷重2kgで押圧した状態(冶具がタッチパネルに接地時の摩擦係数が0.7〜1.3)で、各タッチパネルに対して冶具を摺動させ、所定条件で摺動させた後のリニアリティを測定し面圧耐久性を評価した。摺動動作は、透明導電性積層体側において、タッチパネルの周縁部から距離5mm以上離れた範囲内の領域で行った。また、摺動条件は、摺動回数を100回、タッチパネルのギャップを100μmとした。
下記表1より明らかな様に、実施例の透明導電性積層体は、タッチパネル用としての高温高湿信頼性を満足し、かつ面圧耐久性に優れることが分かる。
2(21,22) 導電性薄膜
3 積層透明基体
31,32 基体フィルム
41,42 粘着剤層
5 誘電体薄膜
6 ハードコート層
A 透明導電性積層体
s スペーサー
Claims (4)
- 透明なフィルム基材の一方の面に、透明導電性薄膜を有し、
透明なフィルム基材の他方の面には、透明な粘着剤層を介して透明基体が貼り合わされている透明導電性積層体であって、
透明導電性薄膜は、SnO2/(SnO2+In2O3)が2〜6重量%であるインジウム・スズ複合酸化物からなる第1の透明導電性薄膜と、SnO2/(SnO2+In2O3)が6重量%を超え、20重量%以下であるインジウム・スズ複合酸化物からなる第2の透明導電性薄膜とが、透明なフィルム基材の側からこの順に形成されてなり、上記第1の透明導電性薄膜の厚さt1と第2の透明導電性薄膜の厚さt2とが、以下の(1)〜(3);
(1)t1=10〜30nm
(2)t2= 5〜20nm
(3)t1+t2=20〜35nm
の関係を有すると共に、上記第1の透明導電性薄膜と第2の透明導電性薄膜とがいずれも結晶膜であり、
透明基体は、少なくとも2枚の透明な基体フィルムを透明な粘着剤層を介して積層した積層透明基体であることを特徴とする透明導電性積層体。 - 前記透明導電性薄膜は、フィルム基材の側から透明な誘電体薄膜を介して設けられていることを特徴とする請求項1記載の透明導電性積層体。
- 前記透明基体の外表面に樹脂層が設けられていることを特徴とする請求項1または2に記載の透明導電性積層体。
- 請求項1〜3のいずれかに記載の透明導電性積層体を備えたことを特徴とするタッチパネル。
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JP2006247001A JP4721359B2 (ja) | 2006-09-12 | 2006-09-12 | 透明導電性積層体及びそれを備えたタッチパネル |
TW96130350A TW200827163A (en) | 2006-09-12 | 2007-08-16 | Transparent conductive laminate and touch panel equipped with the same |
TW99137057A TW201111174A (en) | 2006-09-12 | 2007-08-16 | Transparent conductive laminate and touch panel therewith |
KR1020070086717A KR100911640B1 (ko) | 2006-09-12 | 2007-08-28 | 투명 도전성 적층체 및 그것을 구비한 터치 패널 |
CN200710148726XA CN101143498B (zh) | 2006-09-12 | 2007-09-06 | 透明导电性叠层体及具备该叠层体的触摸面板 |
US11/898,118 US8029886B2 (en) | 2006-09-12 | 2007-09-10 | Transparent conductive laminate and touch panel therewith |
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Cited By (2)
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KR20180087515A (ko) * | 2017-01-24 | 2018-08-02 | (주)에프티씨 | 정전용량방식 및 감압방식 동작기능을 갖는 도전성 액정보호필름 및 제조방법 |
KR101897172B1 (ko) * | 2017-01-24 | 2018-09-13 | (주)에프티씨 | 정전용량방식 및 감압방식 동작기능을 갖는 도전성 액정보호필름 및 제조방법 |
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TWI374090B (ja) | 2012-10-11 |
CN101143498A (zh) | 2008-03-19 |
KR100911640B1 (ko) | 2009-08-10 |
US8029886B2 (en) | 2011-10-04 |
JP2008071531A (ja) | 2008-03-27 |
US8227077B2 (en) | 2012-07-24 |
US20120012370A1 (en) | 2012-01-19 |
TW200827163A (en) | 2008-07-01 |
KR20080024065A (ko) | 2008-03-17 |
TW201111174A (en) | 2011-04-01 |
CN101143498B (zh) | 2010-06-02 |
US20080261030A1 (en) | 2008-10-23 |
TWI346614B (ja) | 2011-08-11 |
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