OPTICAL INFORMATION RECORDING MEDIUM AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To obtain a disk stable in tracking servo by adopting the constitution which is provided with information recording layers of which the state changes reversibly between amorphous and crystalline states and is provided with an over-coating layer adjacently to the information recording layers and in which a first substrate and a second substrate facing the same are bonded by an adhesive. SOLUTION: The laminated information recording layers 2 are provided with the over-coating layer 3 by applying and forming UV curing type resins by a spin coating method while changing the thickness of 5 to 35 microns at intervals of 5 microns respectively and irradiating the respective UV curing type resins with UV rays. The substrate 1 having the laminated information recording layers 2 and the over-coating layer 3 and the substrate having the same constitution as the constitution of the substrate 1 are bonded in such a manner that the substrates come to the outer side and the UV curing type adhesive consisting essentially of a resin of a cation polymn. system is applied thereon by a screen printing method and irradiating the adhesive with the UV rays, by which the optical disk is obtd. The similar effect is obtainable even if a resin of an epoxy system is used as the bonding resin.