| 摘要 |
PURPOSE:To improve the sensitivity during recording and reproduction as well as the resolution, to reduce the recording power, and to carry out improved high-density recording by recording information as a change in the optical characteristics and by changing the reflectance before and after recording especially by making use of interference of light. CONSTITUTION:The 1st layer 1 and the 2nd layer 2 whose optical characteristics are changed chiefly by heating are laminated on a substrate S such as a glass substrate or an acrylic resin substrate. The layer 1 is made of material reflecting light for recording having a specified wavelenght such as semiconductor laser light at relatively high reflectance when the layer 1 is a single layer. The material absorbs semiconductor laser light at a higher absorption factor than the material of the layer 2, and it transduces absorbed light into heat. BixTe1-x (where 0.25<=x<=0.55) is used as the material. The layer 2 is made of a material whose optical characteristics such as refractive index, reflectance and absorption factor are changed chiefly by heating, and the layer 2 is especially made of SbySe1-y (where 0.20<=y<=0.60). |
