| 摘要 |
PURPOSE:To make it possible to house a recording information quantity of about four-times the present recording information quantity without subjecting the device side to drastic changes, such as shortening of the wavelength of reproducing light, increasing of the numerical aperture NA of a focusing lens and changing of a signal demodulation system. CONSTITUTION:A saturable absorption dyestuff-contg. layer 3 consisting of saturable absorption dye and polymer material is formed on a transparent substrate 1 formed out of the recording patterns in which pits 5 are formed with recording patterns corresponding to information signals. The dye which is 10<4=epsilon in the molecular absorption constant epsilon at the wavelength of reproducing light and lns<=tau<=100ns in relaxation time tau is used as the saturable absorption dye of the optical recording medium with which the recording patterns of the pits 5 are subjected to signal reproduction by the super-high resolution reproducing mechanism. A polymer having a carbazole group is used as the polymer material. As a result, the development sensitivity of super-high resotution is improved and the super-high resolution reproduction is eventually executed as high C/N ratio even when the reproducing power is set low. |
