| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical pickup for an optical disk device using BD, DVD and CD as recording media, in which simplification of constitutional elements is promoted.SOLUTION: The optical pickup includes a dual wavelength type laser beam source for generating laser beams for DVD and CD, a single wavelength type laser beam source for generating a laser beam for BD, and a first wave plate for converting the laser beam for BD generated from the laser beam source into circular polarization. It further includes a second wave plate for converting the laser beam for DVD generated from the dual wavelength type laser beam source into 45-degree linear polarization. Recording and reproduction are suitably performed by radiating the laser beam to the recording medium as the circular polarization for BD and the 45-degree linear polarization for DVD. |
