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    • 78. 发明专利
    • ERASABLE TYPE OPTICAL RECORDING MEDIUM
    • JPH0414486A
    • 1992-01-20
    • JP11800990
    • 1990-05-08
    • HITACHI CHEMICAL CO LTD
    • HAGIWARA HIDEOHAYASHI NOBUYUKITAI SEIJIAKIMOTO TAKAYUKIKATAYOSE MITSUO
    • B41M5/26G11B7/24G11B7/244
    • PURPOSE:To present an erasable type optical recording medium which has excellent durability and mass-productivity, and has high recording sensitivity and high erasing sensitivity, and of which characteristic properties do not decrease even when recording-erasing cycles are repeated by making at least one of two layers contain a specified tetra-azaporhin series compound. CONSTITUTION:On a supporting body, a layer for which a polymer under rubber shape at normal temperature is made to contain a dyestuff DY1 to absorb light in a polymer, and a layer for which a polymer under glass shape at normal temperature is made to contain a dyestuff DY2 to absorb light with a different wavelength from the light for previously mentioned DY1 are formed to be side by side. At least one of the dyestuff DY1 and DY2 is a tetra-azaporphin series compound shown by a formula 1. In the formula, M shows Si, Ge or Sn; Y shows aryloxyl group, alkoxyl group; and two (Y)s may be the same or different. A ring shown by A , A , A , and A shows an aromatic ring to which an organic substituting group may be combined, and A , A , A , and A may be the same or different. By selecting an appropriate aromatic ring as the ring shown by A , A , A , and A , various types of lasers can be used.