| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical element for an optical pickup device by which the recording and/or reproducing of information can be appropriately conducted on a plurality kinds of optical information recording media, including a high density optical disk and a DVD using a blue violet laser light source, whose using wavelengths are different, an aberration correcting element for the optical pickup device, a light converging element for the optical pickup device, an objective optical system, the optical pickup device, and an optical information recording reproducing device. <P>SOLUTION: The optical element L1 for the optical pickup device PU conducts the recording and/or reproducing of the information on first and second optical information recording media by using light fluxes having first and second wavelength λ1 and λ2, the optical element L1 has an optical functional zone having a superposition type diffractive structure including a plurality of ring-shaped zones which are formed concentrically around an optical axis, wherein each ring-shaped zone is composed of a plurality of stepped sections, and an optical functional zone having a diffractive structure including a plurality of ring-shaped zones, wherein each of the plurality of ring-shaped zones are divided by a stepped section in the light axis direction inside. <P>COPYRIGHT: (C)2010,JPO&INPIT |
