| 摘要 |
PROBLEM TO BE SOLVED: To reduce crosstalk from the other layer during the placing of a multiplayer optical disk. SOLUTION: A reflected light from the other layer is detected by photodetectors 131, and 121 or the like having proper sizes, installed in an image surface, and a signal from a reading layer is processed. Crosstalk is reduced, and the reading reliability of the multiplayer optical disk is enhanced. |
