Optical recording medium and method for manufacturing the optical recording medium

An optical recording medium comprising:

• a substrate having a guide groove thereon;
• a recording layer located overlying the substrate;
• a reflection layer located overlying the recording layer and comprising Ag in an amount not less than 95% by weight;
• and
• an overcoat layer located overlying the reflection layer and having a glass transition temperature Tg(1) of from 90° C. to 180° C.

An optical recording medium comprising:

• a substrate having a guide groove thereon;
• a recording layer located overlying the substrate;
• a reflection layer located overlying the recording layer and comprising Ag in an amount not less than 95% by weight;
• an adhesive layer located overlying the reflection layer and having a glass transition temperature Tg(2) of from 90° C. to 180° C.;
• and
• either a second substrate or a second optical recording medium which is located overlying the adhesive layer.

A method for manufacturing an optical recording medium comprising:

• forming a first protective layer overlying a substrate;
• forming a recording layer overlying the first protective layer;
• forming a second protective layer overlying the recording layer;
• forming a third protective layer comprising Si in an amount not less than 35 atomic percent overlying the second protective layer at a film forming speed Rm;
• and
• forming a reflection layer comprising Ag in an amount not less than 95% by weight overlying the third protective layer at a film forming speed Rr,
• wherein the following relationships are satisfied:
• 0.02≦Rm/Rr≦0.20, and 0.5 nm/sec≦Rm≦5.0 nm/sec.