| 摘要 |
[PROBLEMS] To provide an optical information recording medium including a pigment appropriate for high-density and high-speed optical recording by the blue laser light of 350 to 500 nm and especially around 400 nm (for example, 405 nm), enabling recording at low power, suppressing thermal affect of recording to the optical recording layer, and assuring a reflection ratio or modulation degree by the change of a refraction index n and an attenuation coefficient k; and to provide a recording method thereof. [MEANS FOR SOLVING PROBLEMS] Instead of the recording based on the optical phase difference obtained by a change ”n of the refraction index n of the pigment as in the conventional method, a pigment capable of performing recording based on the change ?k of the attenuation coefficient k has been obtained. Recording may be performed mainly by the change ”k of the attenuation coefficient k. It is preferable to use a recording wavelength which is at the side of longer wavelength than the absorption peak of the absorption spectrum for the laser beam of the aforementioned pigment. However, the invention is not to be limited to this and characterized in recording performed by the change of the attenuation coefficient of the pigment against the recording wavelength. |
