| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical pickup device and an optical information recording/reproducing device reducing occurrence of frame aberrations due to tracking of an objective lens when performing recording/reproduction to a CD. <P>SOLUTION: This optical pickup device records and/or reproduces information to/from three kinds of optical disks in which recording densities are different from each other, and is provided with a first light source for emitting a first luminous flux, a second light source for emitting a second luminous flux whose wavelength is longer than that of the first luminous flux, a diffraction lens having at least one optical surface where a diffraction structure is formed, and the objective lens for converging the luminous flux which passes through the diffraction lens on the information recording surface of the optical disk. The information is recorded and/or reproduced to/from a first optical disk by the first luminous flux and the information is recorded and/or reproduced to/from a second optical disk and a third optical disk by the second luminous flux. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
