OPTICAL PICK-UP DEVICE

摘要

An optical pickup device is provided to perform the tracking servo of an optical disc accurately by positioning a diffraction grating on a photo diode single route. An optical pickup device comprises: a first optical source part(111) emitting the laser light of wavelength corresponding to DVD/CD; a second optical source part(112) emitting the laser light of the wavelength corresponding to HD-DVD/BD; a first objective lens(131) having openings which are suitable for HD-DVD/DVD/CD; a second objective lens(132) having openings which are suitable for BD; and a prism reflecting or passing the laser light comes out from a first light source or a second light source or the laser light reflected in the optical disc.