| 摘要 |
PURPOSE:To make satisfactory tracking possible even in a high density disk with a narrowed pitch by making the reflectance of a guide layer for tracking higher than that of a recording layer. CONSTITUTION:The reflectance of a guide layer 12 for tracking is made higher than that of a recording layer 14. Since the quantity of laser beam reflected by the guide layer 12 for tracking is increased, the intensity of a tracking signal is enhanced and a tracking servomechanism can easily be controlled. |
