| 摘要 |
There is provided an optical pickup for recording or reproducing an information signal on/from a plurality of optical discs, each including a protective substrate having a different thickness for protecting a signal recording surface. The optical pickup includes: a light source section emitting a light beam having a predetermined wavelength; a first and second objective lens collecting light on the signal recording surface while reducing a spherical aberration due to a protective substrate having a first and second thickness, respectively; a polarization switching section adapted to switch a polarized state of the light beam emitted from the light source section; and a polarization beam splitter adapted to guide the light beam to either the first objective lens or the second objective lens depending on the polarized state of the light beam switched by the polarization switching section.
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