| 摘要 |
A description is given of an optical storage system comprising an optical storage medium ( 1 ) and an optical head device ( 6 ). The medium has a substrate ( 2 ), a recording stack ( 3 ) and an optically transparent protective coating stack ( 4 and 5 ), for protecting the recording stack from impact by the optical head device ( 6 ). The protective coating stack comprises a multi-layer ( 4 and 5 ) of at least: a first layer ( 5 ) with a thickness smaller than 40 nm and a surface with a surface energy smaller than 1.5 J/m<SUP>2</SUP>, and a second layer ( 4 ), adjacent the first layer ( 5 ), with a Young's modulus E smaller than 10 GPa and larger than 0.001 GPa. This combination of layers ( 4 and 5 ) is very resistant to damage caused by mechanical impact of the optical head device ( 6 ). No lubricants are required. |
