| 摘要 |
PURPOSE:To decrease the double refraction by constituting an adhesives with a specific anaerobic adhesives. CONSTITUTION:The volume contraction rate of the adhesives is 5% or less, the viscosity is 10-1,000cps (25 deg.C) and the thermal expansion coefficient ratio of the adhesive curing substance to a light transmissive plastic base is 0.1-10 and the adhesives is made of an aerobic adhesives in an optical disc where light transmissive plastic bases 1 provided with a recording member are bonded via a spacer 3 at a prescribed interval by means of the adhesives 2. A transparent plastic such as a PC or PMMA is used for the base 1 preferably and a PC the same type of material as the base is used for the spacer 3 in order to match the thermal expansion coefficient. Thus, the double refraction is very small and an excellent recording and reproducing signal is obtained. |
