REWRITING TYPE OPTICAL STORAGE MEDIUM

摘要

PURPOSE:To obtain an independent compd. layer which permits recording and erasing by a specific photon mode as an optical storage medium layer by constituting a medium for recording and erasing by irradiation of laser light of a substrate and a solid phase of a spiropyrane compd. alone. CONSTITUTION:This medium is constituted of the substrate 1 and the recording layer 2 consisting of the spiropyran compd. and an intervening layer as a reflection layer, for example, a vapor deposited aluminum layer 10 is provided between the substrate 1 and the recording layer 2. The soln. of spiropyran is coated on the substrate by a spin coating method or the like and is subjected to a heat treatment after drying. It is also possible to utilize a film forming method such as vapor deposition method. This recording layer is formed by utilizing the transmittivity change, reflectivity change or refractive index change arising from the cleavage of the bond generated when spiropyrane molecules absorb light energy. An irradiated part 4 is colored by the irradiation of light from a light source 3 and information is recorded. The reproduction of the information recorded in such a manner can be realized by the change of the transmittivity when the light is irradiated. On the other hand, the erasing of the recorded information is executed by the irradiation of another light or heating.