<p>An optical head (10) used for an optical disk (30) in which a variation in the thickness of a light transmission layer is large includes a divergence/convergence degree enlarging member (20) secured between a collimation lens (4) and an objective lens (6). Since the movement range of the collimation lens can be reduced, this optical head can be miniaturized.</p>
申请公布号
WO2007119410(A1)
申请公布日期
2007.10.25
申请号
WO2007JP55462
申请日期
2007.03.19
申请人
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.;YAMASAKI, FUMITOMO;AIKOH, HIDEKI;ARAI, AKIHIRO