| 摘要 |
An optical recording disc is constituted by laminating a substrate, a reflective layer, a third dielectric layer, a light absorption layer, a second dielectric layer, a metal recording layer, a first dielectric layer and a light transmission layer in this order, and is constituted so that when a laser beam is irradiated onto the optical recording disc from the side of the light transmission layer, the metal recording layer is deformed and/or is changed in quality to form a state-changed region in the metal recording layer and the second dielectric layer and the light absorption layer are deformed and/or are changed in quality to form state-changed regions in the second dielectric layer and the light absorption layer, whereby a recording mark is formed in the metal recording layer, the second dielectric layer and the light absorption layer. In the thus constituted optical recording disc, even in the case where the length of the recording mark and the length of a blank region between neighboring recording marks are shorter than the resolution limit, it is possible to record data constituted by a recording mark train including the recording mark and the blank region in the optical recording disc and reproduce the data therefrom in a desired manner and markedly increase the storage capacity of the optical recording disc.
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