| 摘要 |
PURPOSE:To obtain an optical recording medium requiring no reflection layer composed of an inorganic compound, by employing a specific phthalo/ naphthalocyanine coloring matter in a recording layer and controlling the thickness of the recording layer to a proper level. CONSTITUTION:A recording layer provided on a transparent substrate is composed of less than 20wt% of resin binder and phthalo/naphthalocyanine coloring matter shown by formula I; in the formula, M represents a metal, a metal oxide or a metal halide, while L1, L2, L3 and L4 represent a benzene ring or naphthalene ring skeletons having no substituent or one or more univalent substituent Z. The substituent Z is selected from -SO2NR<1>R<2>, -COR<3>, -COOR<4>, -CONHR<5>, -NR<6>R<7>, -R<8>-OR<9>, -R<10>X and -X, where R<1>-R<10> represent hydrocarbon group having carbon number of 1-12, and X represents halogen. The total number of carbon in all substituent Z of one molecule of said coloring matter is in the range of 16-96. The thickness of the recording layer is 50-300nm, and a signal is recorded or read out by a light beam transmitted through the transparent substrate. |
