| 摘要 |
PURPOSE:To obtain an optical disk which obviates transfer of air bubbles and has low moisture permeability and high reliability by using an adhesive agent having D70-D78 Shore hardness as an adhesive agent for sticking substrates. CONSTITUTION:The optical disk substrates 11, 11' which consist of an epoxy resin, acrylic resin or ester base resin, etc., and have guide grooves are stuck to each other by the adhesive agent 13 consisting of an epoxy resin or the like which is slightly softer than the hardness of the guide grooves and has D70-D78 Shore hardness. The transfer of air bubbles is thereby prevented and since the molecules have fairly high rigidity, the moisture permeability is low and the reliability to the extent that said moisture permeability is of no problem in practicable use is assured. |
