An optical pickup apparatus includes: a laser diode configured to emit a laser beam; and an objective lens configured to condense the laser beam into a laser spot through which a signal recorded on a signal recording layer of an optical disc is read out by the laser beam, the objective lens having formed thereon a lens surface with a second numerical aperture for acting as a lens, which is larger than a first numerical aperture for forming the laser spot.
申请公布号
US8264939(B2)
申请公布日期
2012.09.11
申请号
US20100945636
申请日期
2010.11.12
申请人
HOTTA TOHRU;KAWASAKI RYOICHI;SANYO ELECTRIC CO., LTD.;SANYO OPTEC DESIGN CO., LTD.