| 摘要 |
PURPOSE:To discriminate easily each optical disk medium by providing a display part to the disk medium for display the characteristics, the using conditions, etc. of the corresponding disk medium. CONSTITUTION:A display part 16 is provided on the surface of a display area 12 for display of the characteristics, the using conditions, etc. of an optical disk medium 10. In this case, the code numbers are used to show said characteristics, the using conditions, etc. In this example, the code '05' shows that the reflection factor of the recording layer of the medium 10 is equal to about 50% in an unrecording mode together with the code '01' showing about 10% reflection factor of said recording layer in a recording mode respectively. Furthermore, the codes '23' and '504' show the threshold value of the laser light in an information recording mode and a physical constant like a boiling point or a melting point, etc. Thus it is possible to discriminate easily the characteristics, the using conditions, etc. of the medium 10. |
