DYE FILM

摘要

PURPOSE:To achieve long-term storage of information and high-density memory both at the same time by using a dye capable of causing photochromic reaction and forming a J association product by at least one of its isomers. CONSTITUTION:An information recording medium 10 is prepared by forming the dye film capable of causing the photochromic reaction and forming the J association product by at least one of the isomers of the dye. The information is written on the medium 10 with laser beam emitted by a light source 5, and the information is erased with an erasing lamp 6. The written information is fixed with a fixing lamp 11, and reading of the written information can be made by using a reading laser lamp 7 and a photosensitive sensor 8.