| 摘要 |
PURPOSE: A rewritable optical disc is provided to increase information storage and decrease the electric power required when writing data on the disc by constructing a record layer with a first layer including aluminum and a second layer including copper. CONSTITUTION: A rewritable optical disc(200) comprises a reflecting layer(220), an upper dielectric layer(230), a recording layer(240), and a lower dielectric layer(250). The reflecting layer, the upper dielectric layer, the recording layer, and the lower dielectric layer are successively formed. The recording layer is composed of a first layer including aluminum and a second layer including copper. The depth ratio of the first layer to the second layer is 1.5:1 to 10:1, respectively. A protective layer is formed on at least one of an upper side and a lower side of the recording layer.
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