An optical pickup includes: a first projector for projecting a first light beam of a first wavelength so as to record and reproduce information with respect to an optical disk having a first light transmissive layer; a second projector for projecting a second light beam of a second wavelength longer...http://www.google.fr/patents/US20040022164?utm_source=gb-gplus-shareBrevet US20040022164 - Optical pickup
Numéro de demande: 10/625,709 Numéro de publication: US 2004/0022164 A1 Date de dépôt: 22 juil. 2003 Brevet délivré: US7260047 ( Date de délivrance 21 août 2007)
