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    • 1. 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
    • Optical pickup lens and optical pickup apparatus
    • 光学拾取镜头和光学拾取装置
    • US07787349B2
    • 2010-08-31
    • US11405436
    • 2006-04-18
    • Koichiro WakabayashiMitsuhiro MiyauchiYasuyuki SugiYutaka Makino
    • Koichiro WakabayashiMitsuhiro MiyauchiYasuyuki SugiYutaka Makino
    • G11B7/00
    • G11B7/1374G11B7/13922G11B2007/0006
    • An optical pickup lens focuses laser beams having different wavelengths λ1, λ2 and λ3 on at least three kinds of optical discs. At least one side of the optical pickup lens has a concentric loop zonal structure for compensating wavefront aberration occurring when recording or reproducing an optical disc having a substrate thickness t1 by the laser beam having the wavelength λ1 and wavefront aberration occurring when recording or reproducing an optical disc having a substrate thickness t2 by the laser beam having the wavelength λ2. When recording or reproducing an optical disc having a substrate thickness t3 by the laser beam having the wavelength λ3, a phase difference given to the laser beam having the wavelength λ3 due to the concentric loop zonal structure is about 0.15λ or smaller.
    • 光拾取透镜将具有不同波长λ1,λ2和λ3的激光束聚焦在至少三种光盘上。 光学拾取透镜的至少一侧具有同心环状区域结构,用于补偿当记录或再现具有波长λ1的激光束和当记录或再现光学时产生的波前像差而具有基板厚度t1的光盘时发生的波前像差 通过具有波长λ2的激光束具有衬底厚度t2的光盘。 当通过具有波长λ3的激光束记录或再现具有基板厚度t3的光盘时,由于同心环形区域结构而给予具有波长λ3的激光束的相位差为约0.15λ或更小。