| 摘要 |
PURPOSE:To expand a laser power tolerance value for recording and erasure by adding oxide having specific standard forming free energy to the recording membrane formed on a substrate and reversibly transferred to states different in optical characteristics by the irradiation with laser beam. CONSTITUTION:An optical data recording medium is adapted to a data recording and regenerating apparatus using laser beam and especially constituted in a rewritable manner. This medium is formed from at least a substrate 1 and the recording membrane 3 formed on the substrate 1 generating a phase change by the irradiation with laser beam to transfer to states different in optical characteristics. In this case, oxide is added to the recording membrane 3 and the standard forming free energy thereof at 1000 deg.C is set so as to become smaller than -900kj/mol O2. As oxide, one kind of oxide among 10 kinds of Gd2O3, Ho2O3, La2O3, Nb2O3, Sc2P3, Sm2O3, SrO, Tb2O3, ThO2 and Y2O3 or a combination of two or more kinds of them is used. |
