| 摘要 |
PURPOSE:To enhance the preservable stability of information and to prevent the interpretation, falsification and forgery by a third person by forming the substrate of multilayered resin layers laminated with >=2 layers of the resin layers. CONSTITUTION:The substrate 1 for the recording medium is formed of the laminate consisting of the multilayered resin layers of the resin layers 1a to 1e. Track groove parts 2 are provided on the substrate 1 and an optical recording layer 3 is formed thereon; further, a protective layer 5 is adhered via a spacer and adhesive layer 4. Then resin layer 1a in contact with the optical recording layer 3 does not contain a UV absorbent and the thermal deformation temp. thereof is 80 to 120 deg.C. The hardness of the resin layer 1e of the outermost layer has >=H pencil hardness. At least one layer of the other resin layers 1b to 1d contain the UV absorbent and at least one layer thereof have <=300X10<-10>cm<2>(STP)cm.cm<-2>.S<-1>cmHg<-1> moisture permeability. At least one layer thereof is opaque to visible light or is subjected to such printing on the surface so as to be opaque to visible light. |
