| 摘要 |
PURPOSE:To obtain reproducing signals comforming to the CD formats by forming such a layer which is deformed by the energy generated by absorption of laser light in a light-absorbing layer, on the side closer to a light-transmitting substrate than to the light-absorbing layer. CONSTITUTION:When the light-absorbing layer 2 is irradiated with laser light, the layer 2 absorbs the light and generates heat, and local increase of pressure is caused by gas or swelling due to melting, evaporation, sublimation, reaction, decomposition or modification of the layer. When the light is focused to irradiated the light-absorbing layer, energy generates and affects the adjacent layers to locally deform them. Thus, optically modified area (pit) is formed, which is similar to a pit formed on the substrate 1 by pressing or other methods. Thereby, the reproducing signals comforming to the CD formats can be obtained. |
