An optical pickup includes a laser light source, an objective lens which focuses light emitted from the laser light source on an optical information storing medium, an optical path changer which changes a proceeding path of the light emitted from the laser light source, a polarization changer which changes...http://www.google.es/patents/US7417936?utm_source=gb-gplus-sharePatente US7417936 - Optical pickup reducing noise and polarization changer
Optical pickup reducing noise and polarization changer
