| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical recording medium having four or more information recording faces which can be read out through one side of the medium. SOLUTION: The first reflection layer 3 has a layer essentially comprising titanium oxide, the second reflection layer 5 has a layer essentially comprising titanium oxide, the third reflection layer 7 has an alloy layer essentially comprising silver, and the fourth reflection layer 9 has an alloy layer essentially comprising aluminum. |
