| 摘要 |
<P>PROBLEM TO BE SOLVED: To stably reproduce a BCA (Burst Cutting Area) signal in an optical disk medium of multilayered information recording layers having an information recording layer in which a burst cutting area is recorded. <P>SOLUTION: An area positioned on the inner peripheral side of an information recording area of the multilayered information recording layers and having a prescribed same radius range is specified to be an area for the burst cutting area. The burst cutting area (BCA) 101 is recorded in one information recording layer 12 and mirror surfaces 5 are formed in the same radius range of the all other information recording layers 11. Thereby, interference from the other layers and scattering of reading light are eliminated and the burst cutting area (BCA) 101 can be stably reproduced. <P>COPYRIGHT: (C)2007,JPO&INPIT |
