Optical pickup for optical disk having multiple recording layers

An optical pickup for an optical disk having multiple recording layers, comprising:

• an optical source for generating an optical beam;
• a polarization diffraction optical element for polarization-diffracting the optical beam generated from said optical source;
• an objective lens for forming spots on each multiple recording layer by focusing the beam diffracted by said polarization diffraction optical element;
• a polarized beam splitter for polarization-dividing beams reflected from said multiple recording layers;
• a plurality of optical detectors for detecting signals by receiving the reflected beams divided by said polarized beam splitter;
• and
• driving means for separately driving said polarization diffraction optical element and said objective lens by using the signals detected by said plurality of optical detectors.

An optical pickup for an optical disk having multiple recording layers, comprising:

• first and second optical sources for generating P-polarized light and S-polarized light, respectively;
• a polarized beam splitter for passing one of said P- and S-polarized light and reflecting the other;
• a polarization diffraction optical element for polarization-diffracting the polarized light from said polarized beam splitter;
• an objective lens for forming spots on each multiple recording layer of said optical disk by focusing the polarized light diffracted by said polarization diffraction optical element;
• first and second optical detectors for detecting signals by receiving the light output from said polarized beam splitter after being reflected from said multiple recording layers of the optical disk;
• and
• driving means for separately driving said polarization diffraction optical element and said objective lens by using the signals detected by said first and second optical detectors.