| 摘要 |
A multilayer optical disk apparatus (14) comprises an optical pickup (4) that emits N (N represents an integer of two or more) laser beams of the same wavelength. The optical pickup (4) emits the N laser beams at the same time, focuses the N laser beams on a first recording layer group alternately configured by N recording layers of the multilayer optical disk (1) and performs a recording operation on the N recording layers at the same time. When changing the recording layers the optical pickup (4) focuses the N laser beams on a second recording layer group configured by recording layers adjacent to the respective recording layers configuring the first recording layer group and performs a recording operation on the N recording layers at the same time.
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