| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical pick up device capable of achieving miniaturization and a high speed and exhibiting high recording/reproducing performance even when a wavelength is made short, high NA is achieved and a multilayer is formed for a large capacity, and an optical disk driving device. <P>SOLUTION: The optical disk device having a plurality of recording layers is provided with a luminous flux changing means 20 for changing the convergence/divergence state of a luminous flux made incident on an objective lens corresponding to a distance between an optical disk substrate surface and a recording layer in each recording layer, and an aberration correction means 40 for changing the wavefront shape of the luminous flux made incident on the objective lens corresponding to the distance between the optical disk substrate surface and the recording layer in each recording layer. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
