| 摘要 |
PURPOSE:To manufacture an information recording medium which has a high sensitivity recording film excellent in signal quality even during high-density recording by using four elements such as tellurium, germanium, bismuth and lead, and defining their composition in an information recording medium which projects an energy beam to a recording film formed on a base and thereby recording information. CONSTITUTION:A recording film consists mainly of four elements such as tellurium(Te), germanium(Ge), bismuth(Bi) and lead(Pb). If its compositional formula is (TexGe100-x) 100-p-qBipPbq, where the percentage of Te atoms in (Te and Ge) is x, that of Bi atoms is p, and that of Pb in the film is q the composition of these elements is such that the ranges of x, p and q are 40<=x<=75, 1<=p<=20, and 1<=q<=20 respectively. If the percentage of Bi or Pb is small and outside the ranges, unfavorable phenomena such as noise increase or CNR deterioration occurs. On the other hand, if the percentage is large, the crystallization temperature is not reached. Consequently, a stable amorphous phase is not easily formed and excellent recording properties are hardly demonstrated. |
