JP2022527539A - 光学フィルム及びガラスラミネート - Google Patents
光学フィルム及びガラスラミネート Download PDFInfo
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- Physics & Mathematics (AREA)
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Abstract
Description
複屈折反射偏光子を、以下のとおりに調製した。2つのポリマーを光学層に使用した。第1のポリマー(第1の光学層)は、固有粘度が0.72の精製テレフタル酸(PTA)系ポリエチレンテレフタレートであった。第2のポリマー(第2の光学層)は、Eastman Chemical Company(Kingsport,TN)製のポリエチレンテレフタレートグリコール(PETG)GN071であった。第1のポリマーの供給速度と第2のポリマーの供給速度との比を、光学層が表1に示すf比を有するように選択した。スキン層に使用されたポリマーは、固有粘度が0.72の精製テレフタル酸(PTA)系ポリエチレンテレフタレートであった。材料を別個の押出成形機から多層共押し出しフィードブロックに供給し、そこでこれらを275の交互の光学層のパケットに組み立て、両面に第1の光学層のより厚い保護境界層を加えて、合計で277層とした。第2の光学層材料のスキン層を、その目的に特化したマニホールドにおける構造の両面に追加し、279層を有する最終構造を得た。次いで、この多層溶融物を、ポリエステルフィルムに関する従来の方法で、フィルムダイを通してチルロール上にキャストし、急冷した。次いで、キャストウェブを、工業規模の直線式テンターで、表1に示す延伸セクションの温度で、約6:1の延伸比で延伸した。表1はまた、ヒートセット部の温度、テンターフレームトーイン、及び静電容量ゲージによって測定された、得られたフィルムの物理的厚さも提示する。
Claims (15)
- 複数の交互の第1の層及び第2の層を備える光学フィルムであって、前記第1の層は、前記第1の層の第1の面内方向に沿った屈折率と前記第1の層の直交する第2の面内方向に沿った屈折率との差である第1の面内複屈折を有し、前記第2の層は、前記第2の層の前記第1の面内方向及び前記第2の面内方向に沿った屈折率の差である第2の面内複屈折を有し、前記第2の面内複屈折は前記第1の面内複屈折よりも小さく、かつ0.03よりも大きく、前記光学フィルムは、150℃で15分間加熱されたときに、前記第1の面内方向に沿って4%を超える収縮率を有し、前記第2の面内方向に沿って3%を超える収縮率を有する、
光学フィルム。 - 前記第1の面内方向に沿った前記収縮率は、150℃で15分間加熱されたときに、6%を超える、請求項1に記載の光学フィルム。
- 前記第2の面内方向に沿った前記収縮率は、150℃で15分間加熱されたときに、5%を超える、請求項1又は2に記載の光学フィルム。
- 前記第1の層が、ポリエチレンテレフタレートホモポリマーを含み、前記第2の層が、第1のグリコール変性コ(ポリエチレンテレフタレート)を含む、請求項1~3のいずれか一項に記載の光学フィルム。
- 前記第1の面内方向に沿った前記第1の層と前記第2の層との間の屈折率の差Δn1は、少なくとも0.03であり、前記第2の面内方向に沿った前記第1の層と前記第2の層との間の屈折率の差Δn2は、Δn1未満の絶対値|Δn2|を有する、請求項1~4のいずれか一項に記載の光学フィルム。
- 複数の交互の第1の層及び第2の層を備える反射偏光子であって、前記第1の層はポリエチレンテレフタレートホモポリマーを含み、前記第2の層はグリコール変性コ(ポリエチレンテレフタレート)を含み、前記反射偏光子は、150℃で15分間加熱されたときに、前記反射偏光子のブロック軸に沿って4%を超える収縮率を有し、前記反射偏光子の直交する通過軸に沿って3%を超える収縮率を有する、
反射偏光子。 - 前記グリコール変性コ(ポリエチレンテレフタレート)は、第1のグリコール変性コ(ポリエチレンテレフタレート)と、異なる第2のグリコール変性コ(ポリエチレンテレフタレート)とを含む、請求項6に記載の反射偏光子。
- ガラスラミネートを製造する方法であって、前記方法は、
第1のガラス層及び第2のガラス層を提供する工程と、
前記第1のガラス層と前記第2のガラス層との間に反射偏光子を配置する工程であって、前記反射偏光子は、主に光干渉によって光を反射及び透過する複数の交互のポリマー干渉層を含む、反射偏光子を配置する工程と、
前記反射偏光子と、前記第1のガラス層及び前記第2のガラス層それぞれとの間に、第1の接着剤層及び第2の接着剤層を配置する工程と、
少なくとも120℃の温度及び少なくとも0.9MPaの圧力で、前記反射偏光子を前記第1のガラス層及び前記第2のガラス層にラミネートして、前記ガラスラミネートを提供する工程と、を含み、
前記ラミネートする工程の前に、前記反射偏光子は、150℃で15分間加熱されたときに、前記反射偏光子のブロック軸に沿って4%を超える収縮率を有し、前記反射偏光子の直交する通過軸に沿って3%を超える収縮率を有する、
方法。 - 前記ラミネートする工程の前に、前記反射偏光子は、請求項1~5のいずれか一項に記載の光学フィルム、又は請求項6若しくは7に記載の反射偏光子である、請求項8に記載の方法。
- 前記ラミネートする工程の後、前記反射偏光子は、前記ブロック軸に沿って少なくとも0.5MPaの引張応力を有し、前記通過軸に沿って少なくとも0.5MPaの引張応力を有する、請求項8又は9に記載の方法。
- 前記ラミネートする工程の後、前記ブロック軸に沿った前記引張応力は少なくとも1MPaであり、前記通過軸に沿った前記引張応力は少なくとも3MPaである、請求項10に記載の方法。
- ガラスラミネートであって、
第1のガラス層及び第2のガラス層と、
複数の交互のポリマー干渉層を備え、前記第1のガラス層と前記第2のガラス層との間に実質的に対称に配置され、前記第1のガラス層と前記第2のガラス層とに結合された反射フィルムであって、複数の平行な直線が前記ガラスラミネート上に、前記ガラスラミネートの法線に対して40度~75度の範囲の角度θをなす第1の方向に沿って投影され、前記第1の方向と前記法線とによって画定される入射面に直交する第2の方向に沿って、前記複数の平行な直線が延びる場合、投影された各直線は、前記反射フィルムから反射線として反射し、各反射線は、前記反射線の中心線を画定する輝度分布を有し、前記反射線の前記中心線と前記第2の方向との間の角度αの分布は、2.5度未満の標準偏差を有する、反射フィルムと、
を備えるガラスラミネート。 - ガラスラミネートであって、
第1のガラス層及び第2のガラス層と、
複数の交互のポリマー干渉層を備え、前記第1のガラス層と前記第2のガラス層との間に配置され、前記第1のガラス層と前記第2のガラス層とに結合された反射フィルムであって、複数の平行な直線が表示表面から前記ガラスラミネート上に、第1の方向に沿って投影され、前記直線の各々が、前記表示表面上で実質的に同じ線幅を有し、前記第1の方向が、前記ガラスラミネートの法線に対して40度~75度の範囲の角度θをなし、前記複数の平行な直線が、前記第1の方向と前記法線とによって画定される入射面に直交する第2の方向に沿って延びる場合、投影された各直線は、前記反射フィルムから反射線として反射し、前記反射線の画像は、画像平面内で輝度分布を有し、前記表示表面から前記画像平面への拡大率は約1であり、各反射線の前記画像の前記輝度分布は、最良適合直線を中心とする標準偏差を有し、前記標準偏差の平均は線幅の0.9倍未満である、反射フィルムと、
を備えるガラスラミネート。 - 前記反射フィルムは、ブロック軸及び直交する通過軸を有する反射偏光子を備え、前記反射偏光子は、前記ブロック軸に沿って少なくとも0.5MPaの引張応力を有し、前記通過軸に沿って少なくとも0.5MPaの引張応力を有する、請求項12又は13に記載のガラスラミネート。
- 請求項12~14のいずれか一項に記載のガラスラミネートと、前記ガラスラミネート上に表示画像を投影するように配置されたプロジェクタと、を備えるシステムであって、前記ガラスラミネートは、抵抗加熱要素又は熱拡散層のうちの少なくとも1つを更に備え、前記システムは、前記加熱要素又は前記熱拡散層のうちの前記少なくとも1つにエネルギーを供給することにより前記ガラスラミネートを加熱するように適合されている、システム。
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