JP2007538348A - 多層記憶媒体を製造するための方法 - Google Patents

多層記憶媒体を製造するための方法 Download PDF

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JP2007538348A
JP2007538348A JP2007516929A JP2007516929A JP2007538348A JP 2007538348 A JP2007538348 A JP 2007538348A JP 2007516929 A JP2007516929 A JP 2007516929A JP 2007516929 A JP2007516929 A JP 2007516929A JP 2007538348 A JP2007538348 A JP 2007538348A
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Abstract

ディスク形状の被加工物を生成するためのこの発明の方法は、第１および第２のディスク形状の基板を生成するステップと、当該第１の基板の平坦な面の１つ上に少なくとも部分的に第１の接着剤を塗布するステップと、当該第１の接着剤を硬化するステップと、当該第１または第２の基板の平坦な面の少なくとも１つ上に少なくとも部分的に第２の接着剤を塗布するステップと、当該基板を接合して当該ディスク形状の被加工物を形成するステップとを含む。

Description

この発明は、特にＤＶＤ−１４／１８、ＤＶＤ Ｒ ＤＬおよび他の多層媒体等の光学ディスクの製造における、光学データ記憶媒体に関する。
発明の背景
２層片面ＤＶＤ（ＤＶＤ−９等）を製造する一般的な方法は、その各々が情報層を担持する２枚の０．６ｍｍ基板を共に接合することである。二重層ディスクを製造するための別の方法が、いわゆる「２Ｐ処理」である。この２Ｐ処理は、（２枚の）各基板内に１つの層を形成する代わりに、２つの内部情報層を有する単一の基板構造を生じる。このことは、ＤＶＤ−９の製造には必要とされないが、ＤＶＤ１４／１８またはＤＶＤＲ９等の他の多層フォーマットに必要とされる。
関連技術
ＵＳ ６，１１７，２８４およびＵＳ ６，３０９，４９６は、２Ｐ処理に関する一般的な情報を記載している。
この２Ｐ処理の第１の工程では、情報層を有する第１の基板が、射出成形により生成されて、フォーマットに適切な層材料でコーティングされる。次に、第２の基板が第２の情報層を有して生成される。この第２の基板は次に、一般にはＵＶ硬化接着剤を用いて第１の基板と接合される。次の工程では、２枚の（接合された）基板が分離され、それにより、第２の基板の情報層のイメージを有するＵＶ樹脂が、第１の基板に完全に残存する筈である。用途に依存して、第２の基板から第１の基板に同様の態様で金属層を転写することも可能である。
良好な刻印の結果および容易な分離を得るために、ＵＶ硬化接着剤および第２の基板の材料の選択が重要である。第１の基板には一般にポリカーボネートが使用される一方で、第２の基板にはＰＭＭＡまたは他の無極性材料が使用される。
しかしながら、第１および第２の基板間で使用されるＵＶ硬化接着剤は、いくつかの要件を満たさなければならない。一方で、当該材料は良好な刻印の結果を生じなければならず、他方で、当該材料は、分離処理の後に第１の基板にかかる機械的応力を最小に抑え、この基板の曲がりを回避しなければならない。硬化中に一般に生じる収縮の過程により、或る量の応力は避けられない。
１つの硬化接着剤を使用することにより良好な複製を得てかつ曲がりを最小限に抑えることが難しいため、接合層は、２つの異なる接着剤を用いて生成され得る。弾性特性が最適化された第１のものを第１の基板上にコーティングし、複製の特性が最適化された第２のものを第２の基板上にコーティングする。好ましくは、第１および第２の接着剤の厚さ比は不等であるべきである。第１の接着剤の厚さは、厚さが増大するにつれて増大する、基板の曲がりに対する第２の接着剤の望ましくない影響を回避するために、最大にされるべきである。一例を挙げると、ＤＶＤ Ｒ ＤＬ媒体に対する接合層の、必要とされる厚さは、５０μｍであり、これは第１の基板上に４０μｍの第１の接着剤を配置し、第２の基板上に１０μｍの第２の接着剤を配置し、それらを共に接合することにより生成され得る（たとえば図１参照）。
ＵＳ ６，１３６，１３３等に記載される最新の実験では、２つの接着剤が基板上に同時に配置され、次に、１つの硬化工程を用いて共に接合される。この方法は、いくつかの処理工程しか必要としないが、いくつかの欠点を有する。厚さが著しく異なる第１および第２の接着剤を用いた場合、接合処理の高い信頼性およびディスクの外縁の美しさを得ることが難しい。
発明の概要
２つの異なる接着剤を用いる２Ｐ処理に対する最新の解決策の欠点を回避するために、以下の方法を提案する。好ましくは良好な複製の特性を有する第１の接着剤が、適切な基板上にスピンコートされ、第１の硬化工程においてＵＶ光で硬化される。次の工程では、このコーティングされた基板が、第２の接着剤を用いて残りの基板と共に接合される。この工程は、第２の硬化工程によって完了する標準的な接合工程である。
図２により、好ましい一実施例を詳細に示す。ディスク形状の被加工物を生成するためのこの発明の方法は、第１および第２のディスク形状の基板を生成するステップと、当該第１の基板２の平坦な面の１つ上に少なくとも部分的に第１の接着剤１を塗布するステップと、当該第１の接着剤を硬化するステップと、当該第１の基板２または第２の基板４の平坦な面の少なくとも１つ上に少なくとも部分的に第２の接着剤３を塗布するステップと、当該基板を接合して当該ディスク形状の被加工物５を形成するステップとを含む。その後、当該ディスク形状の被加工物は、再び硬化され得る。
この発明は、複合接合層を形成するタスクを、良好に制御され得る２つの工程、すなわち、コーティング処理および接合処理に分離する。それにより、既存の方法にまつわる処理の問題が解消される。接合処理の信頼性および完成したディスクの外縁の美しさが増大する。
接合処理における先行技術の状況を示す図である。 この発明の処理の一実施例を示す図である。
符号の説明
１ 第１の接着剤、２ 第１の基板、３ 第２の接着剤、４ 第２の基板、５ 接合された状態の、ディスク形状の被加工物。

Claims (4)

  1. ディスク形状の被加工物を生成するための方法であって、
    ａ）第１および第２のディスク形状の基板を生成するステップと、
    ｂ）前記第１の基板の平坦な面の１つ上に少なくとも部分的に第１の接着剤を塗布するステップと、
    ｃ）前記第１の接着剤を硬化するステップと、
    ｄ）前記第１または第２の基板の平坦な面の少なくとも１つ上に少なくとも部分的に第２の接着剤を塗布するステップと、
    ｅ）前記基板を接合して前記ディスク形状の被加工物を形成するステップとを含む、方法。
  2. ｆ）前記ディスク形状の被加工物を硬化するステップをさらに含む、請求項１に記載の方法。
  3. 第１の接着剤は、良好な複製の特性を提供するように適合される、請求項１または２に記載の方法。
  4. 第２の接着剤は、良好な弾性特性を提供するように適合される、請求項１から３に記載の方法。
JP2007516929A 2004-05-18 2005-05-13 多層記憶媒体を製造するための方法 Expired - Fee Related JP4616341B2 (ja)

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JP4616341B2 (ja) 2011-01-19
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TW200540864A (en) 2005-12-16
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