| 摘要 |
PURPOSE:To improve a creep characteristic as a full-surface adhesion type optical disk by adhering two sheets of veneers formed by laminating optical recording layers and protective layers on substrates via a fiber reinforced plastic layer. CONSTITUTION:Two sheets of the light transmissive substrate 1 on which the optical recording layers 2 and the protective layers 3 are provided are superposed and adhered by adhesive agent layers 4 via the fiber reinforced plastic layer 5. The layer 5 is preferably made of a material which is a glass fiber reinforced epoxy resin and has >=1X10<5>kg/cm<2> modulus in tension. A hot-melt adhesive is adequate for the adhesive agent layers 4. The creep characteristic is thereby improved without increasing the weight as the full-surface adhesion type optical disk. |
