| 摘要 |
PURPOSE:To improve the surface protective function as well as to obtain antireflection effect by forming an antireflection layer having specified refractive index and thickness by curing a mixture liquid of florine-contg. resin and monomers or oligomers containing polymerizable double bonds. CONSTITUTION:An antireflection layer 13 having specified refractive index and thickness satisfying formulae I and II is formed on the surface of a sub strate 11 opposite to the side for recording layer 12 on the outgoing side of laser beam. The layer 3 consists of a mixture of monomers and/or oligomers containing polymerizable double bonds, and fluorine-contg. resin or fluorine- contg. monomers. In the formulae I, II, ns is the refractive index of the sub strate, (n) is the refractive index of the antireflection layer, lambda is the wavelength of laser beam used for reproduction and (d) is the thickness of the antireflection layer. Thereby, the layer has high hardness, low refractive index and higher surface protective function as well as antireflection effect. Since the used resin is liquid or soluble in an org. solvent, the antireflection layer 13 can be easily formed by coating at low cost. |
