| 摘要 |
PURPOSE:To lower the absorptivity of a data recording layer, to reduce the quantity of light converted to heat and to enhance the stability of reading light by containing a compound wherein the absorption max. value of a data recording layer is shifted toward a short wavelength region by a specific wavelength with respect to the wavelength of used laser beam. CONSTITUTION:The recording layer provided on the surface of a substrate contains a compound wherein an absorption max value is shifted toward a short wavelength region by 20-100nm with respect to the wavelength of used laser beam. This recording layer contains at least one of an azaphthalocyanine compound, a phthalocyanine compound or a naphthalocyanine compound represented by formula I [wherein M is Si, Ge or Sn, Z<1>, Z<2>, Z<3> and Z<4> are a pyridine ring, benzene ring or naphthalene ring skeletal which is not substituted or has one or move monovalent substituent X and may be same and different, Y<1> and Y<2> are -Ar, -OR, -OAr, -ISi(R)3, -OSI(OR)3, -OSi(OAr)3 or -OC(C6H<5>)3 and may be same or different, Ar is a phenyl group or a substituted phenyl group, R is a 1-20C straight chain or branched alkyl group]. The azaphthalocyanine compound, the phthalocyanine compound or the naphthalocyanine compound is dissolved or dispersed in a solvent along with a binder and the obtained solution is applied to the surface of the substrate according to a usual coating method to be formed into a film. |
