| 摘要 |
<P>PROBLEM TO BE SOLVED: To add a function to discriminate whether an optical pickup is operated normally or not to an optical disk and to provide a cleaning member in a prescribed region. <P>SOLUTION: The inner periphery of the performance surface of the optical pickup cleaning disk 2 having recorded digital signals 1 is provided with a region 4 satisfying the reference reflectivity of not interfering the condensation of a laser beam 3 and reading out at all and the cleaning region 5 on the outer peripheral is provided with the cleaning member 6. The regions exclusive of the above region are divided to a plurality and the inner and outer sides thereof are provided with the regions 7 and 8 having the rates of reducing reflection and light shielding at respectively changed ratios. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
