| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an excellent optical disk nearly free from the stamper changes. <P>SOLUTION: The optical disk has a plurality of recording surfaces (101, 104, 107 and 110), wobbled guide grooves (102, 103, 105, 106, 108, 109, 111 and 112) are formed on the respective recording surfaces and the guide grooves are wobbled in a plurality of frequencies. Since wobbling frequencies of a part of the guide grooves are different in every recording surface (guide grooves 102, 105, 108 and 111), the excellent optical disk nearly free from the stamper change can be obtained. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
