| 摘要 |
PURPOSE:To prevent light damages and to enhance S/N of reproduction characteristics by executing optical recording while using an inorg. photochromic material added with a rare earth element executing wavelength light emission in a prescribed electron state and executing reading out by the light emission of a prescribed wavelength. CONSTITUTION:A recording layer 2 having the inorg. photochromic material added with the rare earth element is deposited on a base body 1 and a protective film 3 is deposited thereon, by which an optical recording medium 4 is constituted. The light emission of 2nd wavelength light lambda2 is not obtainable with the recording layer 2 by the excitation of 1st wavelength light, lambda1 in the 1st electron state of rare earth ions. The rare earth ions are changed to the 2nd electron state by the photoionization by the irradiation with 3rd wavelength light lambda3. The wavelength light lambda2 is emitted by the excitation of the wavelength light lambda1. The recording of information is executed by the 1st and 2nd electron states with the wavelength light lambda3 as recording light. The reading out of the information is executed by the presence or absence or the magnitude of the emission of the wavelength light lambda2, using the wavelength light lambda1 as the exciting light. |
