| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical disk reproduction device which excellently reproduces each of multiple kinds of optical disks. SOLUTION: This is an optical disk reproduction device which can reproduce signals stored in each of multiple kinds of optical disks through an optical pickup. The reproduction device is provided with; a numerical aperture changing means which changes numerical apertures for light beams emitted from the optical pickup in accordance with the optical disks to be reproduced; and a signal processing system changing means which changes the characteristics of a signal processing system connected to the post-stage of the optical pickup to a state corresponding to the optical disks to be reproduced according to the change of the numerical aperture by the numerical aperture changing means. COPYRIGHT: (C)2006,JPO&NCIPI
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