摘要 |
PURPOSE:To provide an optical information recording medium having high sensitivity and reliability, by providing a recording layer comprising pressure- sensitive microcapsules containing a fluorescent substance coated with a shell comprising a substance for optically hiding the fluorescent substance. CONSTITUTION:A recording layer 7 in which pressure-sensitive microcapsules 3 containing a fluorescent substance coated with a film comprising a substance for optically hiding the fluorescent fubstance are dispersed in a binder layer 2 is provided on a base 1. The fluorescent substance may be fluoroscein, eosine or the like. The substance forming the shells of the pressure-sensitive microcapsules and optically hiding the fluorescent substance may be a copolymer of gelatine and an anionic high molecular weight compount. When this optical information recording medium is irradiated with laser light 8, the light is absorbed by a light-absorbing component in the binder layer 2 with the result of generation of heat, whereby an evaporable or expandable component in the recording layer is evaporated or expanded to generate a pressure, which breaks the microcapsules at an irradiated part 6, and optical characteristic at the irradiated part is changed, thereby achieving recording. |