| 摘要 |
PURPOSE:To operate both of focus servo and tracking servo easily by a method wherein, after a first recording layer is formed, a second recording layer made of photocuring type resin is formed. CONSTITUTION:In order to write data in an optical recording medium, if a semiconductor laser beam having a wavelength lambda1 is applied to a substrate side, the applied laser beam is absorbed by pigment in a first recording layer and the resin of the first recording layer is expanded by the absorbed heat to deform the resin layer of a second recording layer. The temperature of the resin layer of the second recording layer is not elevated above a glass transition temperature and the resin layer is deformed elastically by the stress given by the first layer and holds the deformed shape. In order to erase the data, if a semiconductor laser beam having a wavelength lambda2 is applied, pigment contained in the second recording layer absorbs the laser beam having that wavelength to elevate the temperature of the second recording layer above the glass transition temperature and the original shape of the second recording layer is restored. With this constitution, both of focus servo and of tracking servo can be operated easily. |
