Optical information recording medium and method for manufacturing the same

An optical information recording medium comprising:

• n information layers (n is an integer of 3 or more) on a substrate, wherein
• each layer, from a second information layer L1 to an nth information layer Ln−1, has a recording layer and a dielectric layer, where an information layer disposed farthest from a recording/reproducing light incident side is represented by a first information layer L0, and other information layers are represented by said second information layer L1, . . . , and said nth information layer Ln−1 successively toward said incident side,
• each said recording layer contains Te, O, and M (M being at least one element selected from Au, Pd, and Pt) as major components,
• each said dielectric layer has an extinction coefficient of 0 through 1.0 inclusive, contains a material having, as a major component, at least one component selected from AlN, BN, HfN, TaN, TiN, ZrN, BeO, Al2O3, MgO, ZnO, C, and NbC, and
• wherein in each said information layer having said dielectric layer, no reflection layer is provided.

An optical information recording medium comprising:

• a substrate;
• a first information layer formed on said substrate;
• a first intermediate layer formed on top of said first information layer;
• a second information layer formed on top of said first intermediate layer;
• a second intermediate layer formed on top of said second information layer;
• a third information layer formed on top of said second intermediate layer;
• a third intermediate layer formed on top of said third information layer;
• a fourth information layer formed on top of said third intermediate layer;
• and
• a light transparent layer formed on top of said fourth information layer,
• wherein each of said first through fourth information layers has at least a recording layer containing Te, O, and M (M is at least element selected from Au, Pd, and Pt) as major components,
• said first information layer further has a reflection layer containing an Ag alloy or an Al alloy as a major component,
• each of said third information layer and said fourth information layer further has a dielectric layer containing, as a major component, at least one component selected from AlN, BN, HfN, TaN, TiN, ZrN, BeO, Al2O3, MgO, ZnO, C, and NbC, and
• wherein in each said information layer having said dielectric layer, no reflection layer is provided.

An optical information recording medium comprising:

• a substrate;
• a first information layer formed on top of said substrate;
• a second information layer formed on top of said first information layer;
• a third information layer formed on top of said second information layer;
• a fourth information layer formed on top of said third information layer;
• and
• a light transparent layer formed on top of said fourth information layer, wherein
• each of said first information layer, said second information layer, said third information layer, and said fourth information layer has a recording layer,
• each said recording layer contains Te, O, and M (M is at least one element selected from Au, Pd, and Pt) as major components,
• A:B:C:D=1:0.2 through 0.7:0.2 through 0.6:0.2 through 0.5
• where a film thickness of said recording layer in said first information layer is represented by A, a film thickness of said recording layer in said second information layer is represented by B, a film thickness of said recording layer in said third information layer is represented by C, and a film thickness of said recording layer in said fourth information layer is represented by D,
• wherein each of said third information layer and said fourth information layer further has a dielectric layer containing, as a major component, at least one component selected from AlN, BN, HfN, TaN, TiN, ZrN, BeO, Al2O3, MgO, ZnO, C, and NbC, and
• wherein in each said information layer having said dielectric layer, no reflection layer is provided.