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    • 4. 发明授权
    • Objective lens
    • 物镜
    • US07924685B2
    • 2011-04-12
    • US12379797
    • 2009-03-02
    • Yasuyuki SugiMitsuhiro MiyauchiMitsuru ItoNaofumi Ueda
    • Yasuyuki SugiMitsuhiro MiyauchiMitsuru ItoNaofumi Ueda
    • G11B7/135
    • G11B7/13922G11B7/1374G11B2007/0013
    • An object of the invention is to provide a plastic objective lens having a good lens tilt property in both thicknesses of a two-layer disc in a used temperature range even in the plastic objective lens in which a numerical aperture (NA) is equal to or higher than 0.81, while dissolving the problem mentioned above. The objective lens includes a point at which a third order comma aberration amount generated at a time of a lens tilt of the objective lens becomes equal to a third order comma aberration amount generated at a time when a disc is tilted at the same angle amount as the lens tilt angle, in a transparent board thickness which is thicker than a larger thickness of the two-layer transparent board under a room temperature (25±3° C.).
    • 本发明的目的是提供一种在使用温度范围内的双层盘的厚度都具有良好的透镜倾斜性的塑料物镜,即使在数值孔径(NA)等于或等于 高于0.81,同时解决了上述问题。 物镜包括在物镜的镜头倾斜时产生的三阶逗号差异量等于在盘以与角度相同的角度倾斜时产生的三阶逗号像差量的点, 在25℃±3℃的情况下,透明板厚度比双层透明板的厚度厚。
    • 8. 发明授权
    • Objective lens and optical pickup apparatus using the same
    • 物镜和使用其的光学拾取装置
    • US08345530B2
    • 2013-01-01
    • US13308055
    • 2011-11-30
    • Mitsuru Ito
    • Mitsuru Ito
    • G11B7/00
    • G11B7/1374G11B7/1275G11B7/1367G11B7/13922G11B2007/0006
    • Disclosed is an objective lens that favorably focuses multiple laser beams having different wavelengths on information recording layers of optical discs, and an optical pickup apparatus including the lens. The objective lens of the invention is provided with a first region for focusing laser beams of the BD, DVD and CD standards. The first region is provided with an annular zone step having a height calculated on the basis of a wavelength of the laser beam of the BD standard, and thus causes chromatic aberration of the laser beam of the DVD standard. This chromatic aberration corrects spherical aberration occurring due to a difference in thickness between coating layers of optical discs. In the invention, the curve surface shape of the first region is adjusted so that the BD and DVD standards can share the aberration for reducing the aberration of the laser beam of the DVD standard.
    • 公开了一种有利地将具有不同波长的多个激光束聚焦在光盘的信息记录层上的物镜和包括该透镜的光学拾取装置。 本发明的物镜设置有用于聚焦BD,DVD和CD标准的激光束的第一区域。 第一区域设置有基于BD标准的激光束的波长计算的高度的环形区段台阶,从而导致DVD标准的激光束的色差。 该色差校正由于光盘的涂层之间的厚度差而发生的球面像差。 在本发明中,调整第一区域的曲面形状,使得BD和DVD标准可以共享用于减小DVD标准的激光束的像差的像差。