JP7504574B2 - 原盤、原盤の製造方法及び転写物の製造方法 - Google Patents
原盤、原盤の製造方法及び転写物の製造方法 Download PDFInfo
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Description
まず、図1を参照して、本発明の一実施形態に係る原盤の構成について説明する。図1は、本実施形態に係る原盤の構成を模式的に示す断面図である。
続いて、図2A及び図2Bを参照して、本実施形態に係る原盤1における吸収層20の配置の優位性について説明する。図2Aは、図1で示す原盤1と比べて、吸収層20の配置を変更した、比較例1に係る原盤2Aを模式的に示す断面図であり、図2Bは、図1で示す原盤1と比べて、吸収層20の配置を変更した、比較例2に係る原盤2Bを模式的に示す断面図である。
続いて、図3A及び図3Bを参照して、本実施形態に係る原盤1及び転写物の製造方法について説明する。図3A及び図3Bは、本実施形態に係る原盤1及び転写物の製造工程を説明するフローチャートである。
実施例1に係る原盤は、基材とパターン層との間に吸収層が形成された原盤である(図1参照。)。以下の工程により、実施例1に係る原盤を製造した。まず、石英ガラスからなる円筒型形状の基材(外径直径132mm、内径直径123mm、軸方向長さ100mm、径方向の肉厚4.5mm)を用意し、基材を洗浄した。その後、Arガスによるスパッタ法を用いて、基材の外周面にSiを膜厚35nmで成膜することで、吸収層を形成した。続いて、Arガス及び酸素ガスによる酸素リアクティブスパッタ法を用いて、吸収層の上にSiO2を膜厚400nmで成膜することで、パターン層を形成した。
比較例1に係る原盤は、基材の外周面に形成された微細凹凸構造の表面上に、吸収層が形成された原盤である(図2A参照)。以下の工程により、比較例1に係る原盤を製造した。石英ガラスからなる円筒型形状の基材(外径直径132mm、内径直径123mm、軸方向長さ100mm、径方向の肉厚4.5mm)を用意し、基材を洗浄した。
比較例3に係る原盤は、基材と、当該基材の外周面に形成された微細凹凸構造を備え、吸収層が形成されていない原盤である。吸収層を形成しなかったこと以外は、比較例1と同様の方法で比較例2に係る原盤を製造した。
実施例1及び比較例1、2に係る原盤を用いて転写物を製造し、それぞれの転写物の光反射率を測定した。具体的には、ロールツーロールインプリント技術を用いて、トリアセチルセルロース(Triacetylcellulose)のフィルム基材上に設けられた紫外線硬化樹脂に微細凹凸構造を転写した。なお、紫外線硬化樹脂は、メタルハライドランプにより、1000mJ/cm2の紫外線を1分間照射することで硬化させた。その後、微細凹凸構造を転写した転写物の光反射率をそれぞれ測定した。
実施例1及び比較例1に係る原盤の洗浄に対する耐性を評価するために、実施例1及び比較例1に係る原盤に対して、酸素プラズマ処理を15分行い、各原盤の光透過率を測定した。酸素プラズマ処理は、原盤の浄化処理の一例である。酸素プラズマ処理による原盤に対する負荷は、濃硫酸及び過酸化水素水の混合液を用いた洗浄処理による負荷と同等である。そのため、本測定試験では、酸素プラズマ処理を洗浄処理の代替として使用した。
次に、材質ごとの吸収層の光学特性について評価した。具体的には、円筒型形状の原盤を用いた転写後に、当該原盤を個片形状に切断して、試験例1~5に係る原盤個片を制作した。そして、試験例1~5に係る原盤個片について、分光光度計V650(日本分光社製)を用いて、正面透過率及び正面反射率のスペクトルを測定した。さらに、測定した正面透過率及び正面反射率に基づいて、試験例1~5に係る原盤個片の損失透過率を算出した。
損失透過率(%)=100(%)-正面反射率(%)-正面透過率(%)
11 基材
12 パターン層
20 吸収層
30 微細凹凸構造
Claims (13)
- 基材と、
前記基材の一面に設けられ、微細凹凸構造が形成されたパターン層と、
前記基材と前記パターン層の間に挟持されるように設けられ、前記パターン層よりも光吸収係数が大きい吸収層と、
を備え、
前記吸収層は、Siで形成される、原盤。 - 前記基材と前記パターン層との間に設けられた前記吸収層は、前記パターン層を透過又は導波する伝播光を吸収する、請求項1に記載の原盤。
- 前記パターン層は、透明材料で形成される、請求項1又は2に記載の原盤。
- 前記パターン層は、SiO2で形成される、請求項1~3のいずれか一項に記載の原盤。
- 前記基材は、セラミック材料又はガラス材料で形成される、請求項1~4のいずれか一項に記載の原盤。
- 前記微細凹凸構造は、モスアイ構造である、請求項1~5のいずれか一項に記載の原盤。
- 前記基材の前記一面の表面粗さは、前記微細凹凸構造の凹凸の高低差の1/100以下である、請求項1~6のいずれか一項に記載の原盤。
- 前記パターン層の膜厚は、前記微細凹凸構造の凹凸の高低差よりも大きい、請求項1~7のいずれか一項に記載の原盤。
- 前記吸収層の膜厚は、5nm以上である、請求項2に記載の原盤。
- 前記基材の形状は、円筒型形状である、請求項1~9のいずれか一項に記載の原盤。
- 前記基材の前記一面は、前記円筒型形状の外周面であり、
前記パターン層は、前記外周面に沿って設けられる、請求項10に記載の原盤。 - 基材の一面に、Siからなる吸収層を形成するステップと、
前記吸収層の上に前記吸収層よりも光吸収係数が小さく、微細凹凸構造が形成されたパターン層を形成するステップと、
を含む、原盤の製造方法。 - 請求項1~11のいずれか一項に記載の原盤の前記パターン層に光硬化性樹脂を塗布し、樹脂層を形成するステップと、
前記樹脂層を硬化させた後、前記樹脂層を剥離することで、前記微細凹凸構造を前記樹脂層に転写し、転写物を形成するステップと、
前記樹脂層を剥離した後の前記原盤を洗浄することで、前記原盤に残留する前記光硬化性樹脂を除去するステップと、
を含み、
洗浄後の前記原盤を繰り返し用いて、複数の前記転写物を製造する、転写物の製造方法。
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