| 摘要 |
PURPOSE:To obtain an optical information recording medium having excellent durability and favorable recording characteristics, by composing a recording layer of a vapor- deposited film of an aluminum-based phthalocyanine compound, and performing heat mode bit forming type recording by semiconductor laser. CONSTITUTION:An aluminum-based phthalocyanine compound of the formula, wherein X is a halogen or hydroxyl and R is a halogen or hydrogen, has not only excellent durability but also higher reflectance and absorptivity as compared with those of other phthalocyanine derivatives. A vapor-deposited film of the aluminum-based phthalocyanine compound has an absorptivity of at least 20% at 780nm, and particularly, a vacuum-deposited film of the compound having a thickness of 500-5,000Angstrom can have an extremely high reflectance of at least 30% in addition to the high absorptivity. Therefore, a heat mode bit forming type optical information recording medium can be constructed with a single coloring matter layer. An effective use of the optical information recording medium may be based on a system wherein recording of the heat mode bit forming type is carried out by using semiconductor laser light in a wavelength range of 600-900nm, and reading is carried out by detecting as a signal a difference in reflected light intensity between bit parts and other parts on irradiation of the medium with the same semiconductor laser light. |
