| 摘要 |
PURPOSE:To obtain an optical recording medium low in toxicity of a recording layer, requiring low power for recording and capable of high-speed deletion of a record, specifying the composition of the recording layer of an optical recording medium comprising the recording layer on a substrate and capable of recording, reproduction and deletion of information by irradiating the recording layer with light. CONSTITUTION:The composition of a recording layer is in the range of the formula (SbX Te100-X)100-Y(Te50Ge50)Y, in an optical recording medium comprising the recording layer on a substrate and capable of recording, reproduction and deletion of information by irradiating the recording layer with light. In the formula, X is a number satisfying 75>X>70, Y is a number satisfying 25>=Y>=1, the numbers X, 100-X, 50 and 50 inside the parentheses are atomic ratios of the constituents Sb, Te, Te and Ge inside the parentheses, and the numbers 100-Y and Y outside the parentheses are respectively the total atom% of Te and Sb [namely, the contents of the parenthetical expression (SbX Te100-X)] and the total atom% of the contents of the parenthetical expression (Te50Ge50). The optical recording medium requires low power for recording, is capable of high-speed deletion of a record, is high in thermal stability of recorded marks, and has excellent resistant to moist heat. |
