| 摘要 |
PURPOSE:To improve sensitivity and to reduce a noise level by removing a recording medium interposing between the gaps of guiding grooves each other with etching. CONSTITUTION:In an optical disk which executes the recording and deleting of information on the recording medium 3 on the guiding groove 2 provided on a disk substrate 1 by utilizing the difference of reflection factor caused by the difference of the crystallization of the recording medium 3, the recording medium 3 interposing between the mutual gaps of the guiding grooves 2 is removed with etching so as to be used. Namely, the recording medium 3 formed on the disk substrate 1 is selectively etched in order to form the recording medium 3 only on the part of the guiding groove 2. Thus the reduction of the noise and high sensitivity can be realized. |
