| 摘要 |
An optical information recording medium being capable of effecting recording and regeneration by using laser beam which comprises a transparent or opaque substrate and a thin film recording layer, formed on said substrate, said recording layer containing a cyanine coloring matter represented by the following formula: <CHEM> (wherein, R<1>, R<2> and R<3> may be the same or different, each of them stands for an alkyl group having 1 - 6 carbon atoms, X stands for halogen, and Z stands for a superhalogenic ion, a paratoluene sulfonic ion or an alkylsulfuric ion). |
