OPTICAL DISK AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To provide an optical disk which is inexpensive, has high durability and allows the two-layered reading out of one side at a good conditions by setting the thickness of the translucent film consisting of Ag or an alloy consisting essentially of the Ag of the optical disk formed by sticking a first substrate having a metallic reflection plate and a second substrate having the translucent film by a photosetting transparent adhesive in a specific range. SOLUTION: The thickness of the translucent film of the alloy consisting essentially of the Ag is 125 to 225 Å. The amts. of the Cu, W and Mg to be added to the alloy is preferably 0.5 to 10 at.%. The two disks are stuck to each other by using the photosetting transparent adhesive having the surface tension optimum for the crystal grain size of the translucent film. The photosetting transparent adhesive is preferably a UV visible light curing type adhesive which is prepd. by compounding a photopolymn. initiator and sensitizer with an acrylate based oligomer and monomer and has a viscosity of 500 cPs (25 deg.C).