JP2008287880A - 光記録媒体 - Google Patents
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Abstract
【解決手段】基板2の一面側に記録層、光透過層4が順次形成され、光透過層4側から光が照射されて情報の記録再生が行われる光記録媒体であって、基板2の光透過層4が形成される側とは反対側の一面上に、金属、合金、誘電体膜、有機膜のうちの少なくとも1種よりなる防水膜5が形成され、防水膜5上に、アクリルウレタン系の紫外線硬化性樹脂からなる腐食防止膜6が形成され、記録層中の少なくとも情報信号が記録される情報信号部の領域において、光透過層4の厚さtがt=3〜177(μm)であって、光透過層厚さむらをΔtとしたときに、光記録媒体を記録及び/又は再生する光学系の開口数NAおよび波長λとの間に、Δt≦±5.26(λ/NA4)(μm)の関係が成り立つ。
【選択図】図1
Description
上記防水性の膜としては金属膜が挙げられるが、図25に示すような従来の光記録媒体120においては、保護膜123の形成面とは反対側の基板の面121bから光を照射して記録再生するため、この保護膜123の形成面とは反対側の基板の面121b上に、防水性の高い金属膜等を成膜すると、金属が不透明なために光透過性を確保することができず、記録再生を十分行うことができなくなってしまう。
本発明を適用した光記録媒体の第1の例として、以下に再生専用の光記録媒体を取り挙げるが、光磁気記録媒体のような記録再生が可能な光記録媒体であっても良い。
先ず、吸水率がそれぞれ0.01(%)、0.2(%)、0.3(%)と異なる3種の材料を用いて射出成形により基板を成形した。次に、この基板の凹凸パターン上に金属反射膜をスパッタ法により成膜し、更に、その金属反射膜上に紫外線硬化性樹脂を用いてスピンコート法により光透過層を形成した。
実験例1と同様に、基板上に金属反射膜、光透過層を順次形成した。そして、基板の面のうち光透過層とは反対側の面上に、防水膜としてスパッタ法によりAlを膜厚10(nm)、30(nm)となるように成膜し、更にこの防水膜上に腐食防止膜を形成して光記録媒体を製造した。一方、基板上に金属反射膜、光透過層を順次形成し、かつ防水膜を形成しない光記録媒体をも製造した。
d≦0.1161/P(μm/bit)・・・(式3)
=±5.26×(λ/NA4)(μm)・・・(式4)
Claims (28)
- 基板の一主面側に記録層、光透過層が順次形成されてなり、この光透過層側から光が照射されて情報の記録及び/又は再生が行われる光記録媒体であって、基板の上記光透過層が形成される側とは反対側の一主面上に、少なくとも1層の防水膜が形成され、
上記防水膜は、金属、合金、誘電体膜、有機膜のうちの少なくとも1種よりなり、
上記防水膜上に、アクリルウレタン系の紫外線硬化性樹脂からなる腐食防止膜が形成されており、
上記記録層中の少なくとも情報信号が記録される情報信号部の領域において、上記光透過層の厚さtがt=3〜177(μm)であって、該光透過層厚さむらをΔtとしたときに、当該光記録媒体を記録及び/又は再生する光学系の開口数NAおよび波長λとの間に、Δt≦±5.26(λ/NA4)(μm)の関係が成り立つ光記録媒体。 - 上記記録層が、金属反射膜及び/又は記録膜を有する請求項1記載の光記録媒体。
- 上記防水膜が形成されている主面側における吸水率が、0.1(%)以下である請求項1記載の光記録媒体。
- 上記防水膜が、Al、Cr、ステンレススチール合金、Pt、Ti、Au、Ag、Cu、Ni、SiNxOy、SiOx、SiNx、SiCのうちの少なくとも1種からなる請求項1記載の光記録媒体。
- 上記防水膜がAlからなり、上記防水膜の厚みが10(nm)以上である請求項1記載の光記録媒体。
- トラックピッチをP、スキューをΘとすると、P≦0.64(μm)且つΘ≦±84.115°(λ/NA3/t)を満たす請求項1記載の光記録媒体。
- 上記波長λがλ≦0.68(μm)、上記開口数NAがNA/λ≧1.20をみたす記録再生光学系で記録または再生される請求項1記載の光記録媒体。
- 平面円形をなし、外径が125(mm)以下であって、厚さが1.60(mm)以下である請求項1記載の光記録媒体。
- 記録容量が8(GB)とされる線密度である請求項1記載の光記録媒体。
- 上記光透過層の屈折率をNとしたときに、グループまたは情報ピット深さが(λ/8)/Nから(3λ/8)Nの範囲にある請求項1記載の光記録媒体。
- トラックピッチをPとしたとき、トラックピッチむらΔPがΔP≦±0.04P(μm)であり、偏心EがE≦67.57P(μm)、スキューが0.4°以下である請求項1記載の光記録媒体。
- 記録及び/又は再生する光が照射される面の表面粗さRaが、その表面上のスポットサイズ領域内で±3λ/100以下である請求項1記載の光記録媒体。
- 上記基板が熱可塑性樹脂からなり0.3〜1.2(mm)の厚さを有し、上記基板上に案内溝が転写形成され、上記案内溝上に順次多層膜が形成、あるいは有機色素がスピンコートされて記録層とされており、その上に少なくとも1種類の紫外線硬化性樹脂が3〜177(μm)の厚さでコートされて光透過層とされている請求項1記載の光記録媒体。
- 上記紫外線硬化性樹脂が塗布される記録層の表面にシラン処理がなされている請求項13記載の光記録媒体。
- 上記基板が熱可塑性樹脂からなり0.3〜1.2(mm)の厚さを有し、上記基板上に案内溝が転写形成され、上記案内溝上に順次多層膜が形成、あるいは有機色素がスピンコートされて記録層とされており、その上に光透過層として、紫外線硬化性樹脂を介して光透過性フィルムが貼られ、両者の厚さの和が3〜177(μm)とされている請求項1記載の光記録媒体。
- 上記紫外線硬化性樹脂が塗布される記録層の表面にシラン処理がなされている請求項15記載の光記録媒体。
- 上記光透過層は、射出成形またはキャスト法によって作られたシートにマスタスタンパーから高温加熱により信号または案内溝を転写したものである請求項1記載の光記録媒体。
- 上記信号または案内溝を転写したシートに厚さが0.6〜1.2(mm)の支持基板が貼り合わされてなる請求項17記載の光記録媒体。
- 上記支持基板が透明板である請求項18記載の光記録媒体。
- 上記支持基板は、紫外線硬化性樹脂を介して信号または案内溝を転写したシートに接着されている請求項18記載の光記録媒体。
- 上記紫外線硬化性樹脂はスピンコートにより塗布されている請求項20記載の光記録媒体。
- 記録層として記録膜あるいは反射膜と、光透過層が複数積層される、多層構造である請求項1記載の光記録媒体。
- 上記複数の反射膜の反射率が、光の入射する側に向かうに従って小さくなるようにされている請求項22記載の光記録媒体。
- 上記光透過層とは反対側の面にも紫外線硬化性樹脂が塗布されている請求項1記載の光記録媒体。
- 上記光透過層とは反対側に塗布される紫外線硬化性樹脂が、上記光透過層を形成する材料よりも硬化収縮率が高いものである請求項24記載の光記録媒体。
- 上記光透過層の表面に、ハードコートがなされている請求項1記載の光記録媒体。
- 上記光透過層の表面に、反射防止膜が形成されている請求項1記載の光記録媒体。
- 上記反射防止膜の屈折率Nが、上記光透過層の屈折率よりも低く、上記反射防止膜の厚さは、記録及び/又は再生を行う光の波長をλとした場合に、(λ/3)/N(nm)以下である請求項27記載の光記録媒体。
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