| 摘要 |
PURPOSE:To easily obtain an optically recording medium having high sensitivity, contrast ratio, resolution and stability, capable of performing recording with semiconductor laser of longer wavelengths, and reducing a device in size by forming an org. thin film contg. a squalilium dye on a substrate. CONSTITUTION:A squalilium dye represented by formula I (where X is a chromophore), e.g. the dye of formula II is vacuum deposited on a substrate such as a polyester film, glass or Al to form a thin film of about 0.2mu thickness. This film is irradiated with light of relatively longer wavelengths (650-750nm) such as He-Ne laser beams, and the exposed part is removed by sublimation to perform recording. The resulting recording body has a high contrast ratio of readout of transmission mode and reflection mode, consumes less energy for readount, and gives >=1,000 lines/cm resolution. The used dye has sublimability at about 280 deg.C, >=300 deg.C m.p. and >=370 deg.C decompositon temp., so it is vapor depositied easily. This recording body has a enhanced S/N ratio. |
