An optical pickup apparatus comprising: an objective lens configured to focus laser light having the Gaussian distribution properties emitted from a laser diode to a signal recording layer of an optical disc; and an adjustment coating formed on a surface of an incident face of the objective lens on which the laser light is to be made incident, the adjustment coating being configured to adjust transmittance of the laser light passing through the objective lens, the adjustment coating being formed on the surface of the incident face such that the transmittance is lowered as a numerical aperture of the objective lens is reduced.
申请公布号
US2008212452(A1)
申请公布日期
2008.09.04
申请号
US20080040518
申请日期
2008.02.29
申请人
SANYO ELECTRIC CO., LTD.;SANYO OPTEC DESIGN CO., LTD.