JP5114348B2 - 光拡散フィルムの製造方法 - Google Patents
光拡散フィルムの製造方法 Download PDFInfo
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- JP5114348B2 JP5114348B2 JP2008229792A JP2008229792A JP5114348B2 JP 5114348 B2 JP5114348 B2 JP 5114348B2 JP 2008229792 A JP2008229792 A JP 2008229792A JP 2008229792 A JP2008229792 A JP 2008229792A JP 5114348 B2 JP5114348 B2 JP 5114348B2
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Description
デジタルマイクロメーター(アンリツ製(株)、商品名「K−351C型」)を用い、基材に挟まれた状態の光拡散フィルムの全体厚さを測定し、前記全体厚さから、基材の厚さを差し引くことにより、光拡散フィルムの厚さを算出した。
本実施例において光拡散フィルムの作製に用いた露光装置の概略図を図6に示す。Nd:YVO4レーザ61(532nm)(コヒーレント社製Verdi−V8)、ガリレオ式ビームエキスパンダー62、62’(シグマ光機(株)製、3倍(出射レンズ径φ20mm)および105倍(出射レンズ径φ100mm))を、防振台66(シグマ光機(株)製、HOA−2010−150LA)に設置して、ビーム光を拡大した。拡大したレーザ光は、50×50mmサイズの窓63を通すことで、中心部の光強度がほぼ均一の領域だけが出射できるように設置した。レーザ光は、前記各ビームエキスパンダー62を通過した後に、全面が平行光となるようにレンズ調整を行った。レーザ光の平行度は、コリメーションチェッカー(シグマ光機(株)製、SPV−25)を用いて確認した。レーザ光の光強度は、バリアブルアッテネータ64(シグマ光機(株)製)を使用することで減光し、パワーメーター(Gentec社製、PH100−Si)およびモニター(Gentec社製、SOLO)を用いて、所定の値に調整した。なお、面内の露光均一性は、前記パワーメーターにφ1mmのアパーチャを取り付けて、50×50mm面内均等に25点を測定し、誤差が15%以内であることを確認した。さらに、サンプルホルダー65はレーザ光に対して、角度をつけて設置した。
JIS B0601(1994年度版)に従って、平均凹凸間距離Sm(mm)および算術平均表面粗さRa(μm)を測定した。具体的には、反射ホログラム形成防止層の凹凸が形成されていない面に、ガラス板(MATSUNAMI社製、MICRO SLIDE GLASS、品番S、厚み1.3mm、45×50mm)を粘着剤で貼り合わせ、試料を作製した。先端部(ダイヤモンド)の曲率半径R=2μmの測定針を有する触針式表面粗さ測定器((株)小阪研究所製、高精度微細形状測定器、商品名「サーフコーダET4000」)を用い、走査速度0.1mm/秒、カットオフ値0.8mm、測定長4mmの条件で、前記試料の表面形状を一定方向に測定し、平均凹凸間距離Sm(mm)および算術平均表面粗さRaを求めた。なお、前記高精度微細形状測定器は、前記各測定値を自動算出する。
反射ホログラム形成防止層のへイズ値の測定方法は、JIS K7136(2000年版)のヘイズ(曇度)に準じ、ヘイズメーター((株)村上色彩技術研究所製、商品名「HM150」)を用いて測定した。
各実施例および比較例で得られた光拡散フィルムの拡散フィルム原版を剥離した側を、粘着剤(日東電工(株)製、No.7、厚さ23μm)を介して、黒色アクリル板(日東樹脂工業(株)製、商品名「クラレックス」、厚さ1.0mm)に貼り付け、測定サンプルを作製した。前記測定サンプルの色付きを目視により観察し、下記の判定基準で評価した。反射ホログラムが形成されると、黒色アクリル板が青色〜緑色に色付いて見える。
判定基準
AA:色付きがない。
A :色付きが少しあるが、ほとんどわからない。
B :色付きがあり、確認できる。
C :濃い色付きがある。
各実施例および比較例のうち、レーザ光照射角度を8°として作製した光拡散フィルムの反射率およびL*a*b*色差(ΔE*ab)を下記のとおり測定した。
前記色付き評価で作製した測定サンプルのうち、レーザ光照射角度を8°として作製した光拡散フィルムについて、作製時のレーザ光入射方向と測定時の入射光の方向とが略一致するように、8度入射拡散反射測定用治具付き分光光度計((株)日立製作所製、「U−4100」)にセットし、反射スペクトルおよびL*a*b*色差(ΔE*ab)を測定した。なお、リファレンスとして、白色板((株)日立製作所製、硫酸バリウム)を用いた。得られたスペクトルデータのピークトップの値を読み取り、反射率データとした。また、ΔE*abは、参考例で得られたフィルムの測定値を基準として計算した。
(試験片の作製)
感光性樹脂として日本ペイント(株)製フォトポリマー「NPN−005」を、反射ホログラム形成防止層として光拡散フィルム(日東電工(株)製、商品名「AG30G」、厚さ85μm)を、それぞれ準備した。アプリケーター(テスター産業(株)製アプリケーター)を使用して、前記感光性樹脂を前記反射ホログラム形成防止層に塗布した。これを、加熱装置(エスペック(株)製、SPH−201)で90℃、5分間の条件で乾燥し、前記反射ホログラム形成防止層上に厚さ20μmの塗布フィルム(100×150mm)を形成した。さらに、前記反射ホログラム形成防止層の前記塗布フィルム面に、ポリエチレンテレフタレート(PET)フィルム(東レ(株)製、品番S27W、厚さ75μm)を、粘着剤(日東電工(株)製、No.7、厚さ23μm)を介して、ラミネートした。そして、光拡散フィルム原版として光拡散フィルム(Luminit社製、商品名「LSD20PE5」、半値幅20°)を、粘着剤(日東電工(株)製、No.7、厚さ23μm)を介して、前記PETフィルム表面に貼り付け、これを試験片とした。以上の作業は、(株)浅沼商会製「セーフライトガラス」No.3を装着した白熱灯(20W)を使用した環境下で行い、作製した試験片は、アルミホイルで包装し、露光がされないようにした。
前記試験片の光拡散フィルム原版を貼り付けた面に、前記露光装置を用い、光強度2.0mW/cm2、積算光量27mJ/cm2、照射角度8°にて光照射を行った。その後、前記光拡散フィルム原版、前記反射ホログラム形成防止層および前記PETフィルムを試験片から剥がし、加熱装置(エスペック(株)製、SPH−201)に置いたガラス板上で100℃、10分間加熱した。ついで、加熱した前記試験片の全面に、紫外線照射装置(ウシオ電機(株)製、UVC−321AM1(高圧水銀灯))で4.0J/cm2紫外線照射して、本実施例の光拡散フィルムを得た。なお、紫外線照射を行うまでの作業は、(株)浅沼商会製「セーフライトガラス」No.3を装着した白熱灯(20W)を使用した環境下で行い、加熱時にはアルミホイルで包装し、露光がされないようにした。
前記反射ホログラム形成防止層として光拡散フィルム(日東電工(株)製、商品名「AGS1」、厚さ86μm)を用いた以外は、実施例1と同様な条件にて、本実施例に係る光拡散フィルムを作製した。
前記反射ホログラム形成防止層として光拡散フィルム(日東電工(株)製、商品名「AGS2B」、厚さ88μm)を用いた以外は、実施例1と同様な条件にて、本実施例に係る光拡散フィルムを作製した。
前記反射ホログラム形成防止層として光拡散フィルム(日東電工(株)製、商品名「AG150」、厚さ85μm)を用いた以外は、実施例1と同様な条件にて、本実施例に係る光拡散フィルムを作製した。
前記反射ホログラム形成防止層として光拡散フィルム(日東電工(株)製、商品名「AG200」、厚さ105μm)を用いた以外は、実施例1と同様な条件にて、本実施例に係る光拡散フィルムを作製した。
前記反射ホログラム形成防止層として光拡散フィルム(日東電工(株)製、商品名「ARC150T」、厚さ85μm)を用いた以外は、実施例1と同様な条件にて、本実施例に係る光拡散フィルムを作製した。
前記反射ホログラム形成防止層として光拡散フィルム(日東電工(株)製、商品名「ARC270」、厚さ105μm)を用いた以外は、実施例1と同様な条件にて、本実施例に係る光拡散フィルムを作製した。
前記照射角度を15°とした以外は、実施例4と同様な条件にて、本実施例に係る光拡散フィルムを作製した。
前記照射角度を30°とした以外は、実施例4と同様な条件にて、本実施例に係る光拡散フィルムを作製した。
前記照射角度を45°とした以外は、実施例4と同様な条件にて、本実施例に係る光拡散フィルムを作製した。
前記反射ホログラム形成防止層として黒色のテープ(日東電工(株)製黒ビニールテープ、商品名「SPVAW303」、厚さ113μm)を用い、前記照射角度を30°とした以外は、実施例1と同様な条件にて、本参考例に係る光拡散フィルムを作製した。
前記反射ホログラム形成防止層の代わりに、PETフィルム(東レ(株)製、品番S27W、厚さ75μm)を用いた以外は、実施例1と同様な条件にて、本比較例に係る光拡散フィルムを作製した。
前記照射角度を15°とした以外は、比較例1と同様な条件にて、本比較例に係る光拡散フィルムを作製した。
前記照射角度を30°とした以外は、比較例1と同様な条件にて、本比較例に係る光拡散フィルムを作製した。
前記照射角度を45°とした以外は、比較例1と同様な条件にて、本比較例に係る光拡散フィルムを作製した。
感光性樹脂として日本ペイント(株)製フォトポリマー「NPN−005」を準備した。アプリケーター(テスター産業(株)製アプリケーター)を使用して、前記フォトポリマーを光拡散フィルム(日東電工(株)製、商品名「AG30G」、厚さ85μm)に塗布した。これを、加熱装置(エスペック(株)製、SPH−201)で90℃、5分間の条件で乾燥し、前記光拡散フィルム上に厚さ20μmの塗布フィルム(100×150mm)を得た。さらに、前記光拡散フィルムの前記塗布フィルム面に、ポリエチレンテレフタレート(PET)フィルム(東レ(株)製、品番S27W、厚さ75μm)を、粘着剤(日東電工(株)製、No.7、厚さ23μm)を介して、ラミネートしたものを試験片とした。以上の作業は、(株)浅沼商会製「セーフライトガラス」No.3を装着した白熱灯(20W)を使用した環境下で行い、作製した試験片は、アルミホイルで包装し、露光がされないようにした。その後、前記試験片から前記光拡散フィルムを剥がし、加熱装置(エスペック(株)製、SPH−201)に置いたガラス板上で100℃、10分間加熱した。ついで、加熱した前記試験片の全面に、紫外線照射装置(ウシオ電機(株)製、UVC−321AM1(高圧水銀灯))で4.0J/cm2紫外線照射して、本参考例のフィルムを得た。なお、紫外線照射を行うまでの作業は、(株)浅沼商会製「セーフライトガラス」No.3を装着した白熱灯(20W)を使用した環境下で行い、加熱時にはアルミホイルで包装し、露光がされないようにした。
12 感光性樹脂層
13 光拡散フィルム原版
14 0次光
15 拡散光(1次光)
16 透明フィルム
17 裏面拡散反射光
21 光透過性基材
26 裏面鏡面反射光
40 透過ホログラム構造体
41 低屈折率樹脂層
42 高屈折率樹脂層
50 反射ホログラム構造体
61 Nd:YVO4レーザ
62、62’ ガリレオ式ビームエキスパンダー
63 窓
64 バリアブルアッテネータ
65 サンプルホルダー
66 防振台
67 シャッター
Claims (4)
- 光拡散フィルムの製造方法であって、光拡散フィルム原版および少なくとも二種類の屈折率の異なる材料からなる感光性樹脂を少なくとも準備する工程、前記光拡散フィルム原版と前記感光性樹脂とを積層して積層体を形成する工程、コリメートしたレーザ光を前記光拡散フィルム原版側から前記積層体に照射する工程を含み、
前記照射工程において、前記積層体の前記光拡散フィルム原版側とは反対の側に、照射されたレーザ光の反射光により前記感光性樹脂に反射ホログラムが形成されることを防止する反射ホログラム形成防止層を設けた状態で前記レーザ光を照射し、
前記反射ホログラム形成防止層は、表面に凹凸を有する層であり、
前記凹凸形状は、Sm(mm)が0.001〜1の範囲にあり、かつ、Ra(μm)が0.01〜10の範囲にある
ことを特徴とする光拡散フィルムの製造方法。 - 光拡散フィルムの製造方法であって、前記反射ホログラム形成防止層の表面に、反射防止処理がされた反射ホログラム形成防止層を用いる、請求項1記載の光拡散フィルムの製造方法。
- 光拡散フィルムの製造方法であって、前記照射工程において、前記レーザ光の照射を、前記積層体表面の法線に対して所定の角度から行う、請求項1または2記載の光拡散フィルムの製造方法。
- 光拡散フィルムの製造方法であって、前記光拡散フィルム原版として、表面ホログラム、体積ホログラム、回折格子、表面凹凸フィルム、粒子を含有した光拡散フィルムおよび粒子を含有した表面凹凸フィルムからなる群から選択される少なくとも一つを用いる、請求項1から3のいずれか一項に記載の光拡散フィルムの製造方法。
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JP2012103470A (ja) * | 2010-11-10 | 2012-05-31 | Dainippon Printing Co Ltd | 偏光板、液晶表示パネルおよび表示装置 |
JP2013003266A (ja) * | 2011-06-14 | 2013-01-07 | Dainippon Printing Co Ltd | 光拡散部材、偏光板、及び液晶表示装置 |
KR102001272B1 (ko) * | 2012-01-19 | 2019-07-17 | 린텍 가부시키가이샤 | 광확산 필름의 제조 방법 및 광확산 필름 |
JP6078969B2 (ja) * | 2012-03-29 | 2017-02-15 | 大日本印刷株式会社 | 光拡散フィルム、偏光板、及び液晶表示装置 |
JP6016470B2 (ja) * | 2012-06-15 | 2016-10-26 | リンテック株式会社 | 光拡散フィルムの製造方法 |
KR101806886B1 (ko) | 2013-11-19 | 2017-12-08 | 동우 화인켐 주식회사 | 방현 코팅용 조성물 및 이를 이용한 방현 필름 |
KR102177714B1 (ko) * | 2014-01-17 | 2020-11-11 | 엘지이노텍 주식회사 | 광학부재 및 이를 포함하는 발광장치 |
KR101916782B1 (ko) * | 2015-03-06 | 2018-11-08 | 삼성에스디아이 주식회사 | 차광막을 포함하는 디바이스 및 상기 차광막 패터닝 방법 |
US9709710B2 (en) * | 2015-03-06 | 2017-07-18 | Samsung Sdi Co., Ltd. | Device including light blocking layer and method of patterning the light blocking layer |
CN107710028A (zh) * | 2015-06-26 | 2018-02-16 | 日本瑞翁株式会社 | 防静电膜及其制造方法、偏振片以及液晶显示装置 |
JP6920303B2 (ja) * | 2015-12-22 | 2021-08-18 | スリーエム イノベイティブ プロパティズ カンパニー | 構造化層を備えたアクリルフィルム |
JP6679969B2 (ja) * | 2016-02-10 | 2020-04-15 | 大日本印刷株式会社 | 光波長変換シート、バックライト装置、画像表示装置、および光波長変換シートの製造方法 |
CN112752995A (zh) * | 2019-08-29 | 2021-05-04 | 京东方科技集团股份有限公司 | 液晶显示面板及显示装置 |
CN211857087U (zh) * | 2020-02-24 | 2020-11-03 | 宁波激智科技股份有限公司 | 一种减干涉准直膜 |
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