An optical pickup head (100) for a high density recording and/or reproducing device compatible with first and second optical recording media. The pickup head includes a first light source (11) emitting first light beams with a first wavelength, a second light source (12) emitting second light beams with...http://www.google.ca/patents/US7483359?utm_source=gb-gplus-sharePatent US7483359 - Optical pickup head and information recording and/or reproducing apparatus incorporating same
