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    • 3. 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。
    • 4. 发明申请
    • Objective lens and optical pickup system
    • 物镜和光学拾取系统
    • US20080019256A1
    • 2008-01-24
    • US11826623
    • 2007-07-17
    • Mitsuhiro MiyauchiKoichiro WakabayashiYoshikazu MitsuiYasuyuki SugiYutaka Makino
    • Mitsuhiro MiyauchiKoichiro WakabayashiYoshikazu MitsuiYasuyuki SugiYutaka Makino
    • G02B3/02G11B7/00G11B7/135
    • G11B7/1275G11B7/1374G11B7/13922G11B2007/0006
    • There is provided an optical pickup system which includes a first light source emitting first light having a wavelength λ1, a second light source emitting second light having a wavelength λ2 longer than the wavelength λ1, a third light source emitting third light having a wavelength λ3 longer than the wavelength λ2, and an objective lens focusing the first light on an information recording surface of a first optical recording medium, focusing the second light on an information recording surface of a second optical recording medium, and focusing the third light on an information recording surface of a third optical recording medium. In the optical pickup system, at least one lens surface of the objective lens is divided into a plurality of concentric sections with an optical axis, having a step at each boundary between the sections, each of the sections has a different aspherical shape and m1>m2>0 and −0.060≦m3≦−0.020 are satisfied where an imaging magnification at the first light is m1, an imaging magnification at the second light is m2, and an imaging magnification at the third light is m3 in the objective lens. This enables a decrease in aberration at the first light and the second light and an increase in object distance at the third light. Further, this step enables the shared use of a photodetector for detecting the first light and a photodetector for detecting the second light.
    • 提供了一种光学拾取系统,其包括发射具有波长λ1的第一光的第一光源,发射波长λ2长于波长λ1的第二光的第二光源,发射第三光的第三光源,其具有 波长λ3长于波长λ2,以及将第一光聚焦在第一光学记录介质的信息记录表面上的物镜,将第二光聚焦在第二光学记录介质的信息记录表面上,并将第三个光 在第三光记录介质的信息记录表面上的光。 在光学拾取系统中,物镜的至少一个透镜表面被分成具有光轴的多个同心部分,在各部分之间的每个边界处具有台阶,每个部分具有不同的非球面形状,并且m 1 在第一光的成像倍率为m 1,第二光的成像倍数为m 2,第三光的成像倍率为第二光的成像倍率为m 2时,满足m 2> 0且-0.060 <= m 3 <= - 0.020 m 3在物镜中。 这使得能够减少第一光和第二光的像差以及在第三光下物体距离的增加。 此外,该步骤能够共享使用用于检测第一光的光电检测器和用于检测第二光的光电检测器。