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    • 1. 发明申请
    • OBJECTIVE LENS
    • 物镜
    • US20090129238A1
    • 2009-05-21
    • US12188297
    • 2008-08-08
    • Takeshi ShimanoMasaki Mukoh
    • Takeshi ShimanoMasaki Mukoh
    • G11B7/135
    • G11B7/1374G11B7/13925G11B2007/0006
    • A combined aspherical lens has an aspherical shape with an intermediate substrate thickness between the substrate thicknesses of a BD and an HD in a numerical aperture (NA) range for the HD, and an aspherical shape dedicated to the BD in an NA range for the BD only. The lens is designed such that wave aberration occurring through the NA range for the HD for BD reproduction has the same aberration form as but has an opposite sign to wave aberration occurring through this range for HD reproduction. Further, in the NA range for the HD, a pattern of annular transparent electrodes is optimized for a spherical aberration wavefront defocused to minimize the maximum inclination of the wave aberration. A phase shift applied is within plus or minus half wave excluding an integer wavelength of aberration.
    • 组合的非球面透镜具有非球面形状,在HD的数值孔径(NA)范围内具有在BD的基板厚度和HD之间的衬底厚度之间的中间衬底厚度,以及在BD的NA范围内专用于BD的非球面形状 只要。 透镜被设计成使得通过用于BD再现的HD的NA范围发生的波像差具有与HD再现的该范围所出现的波像差相同的像差形式。 此外,在HD的NA范围内,环形透明电极的图案被优化用于散焦的球面像差波前,以最小化波像差的最大倾角。 施加的相移在除了整数像差波长之外的正或负半波之内。
    • 2. 发明申请
    • Objective optical element and optical head apparatus
    • 物镜光学元件和光学头装置
    • US20090052303A1
    • 2009-02-26
    • US12222886
    • 2008-08-19
    • Masaki MukohTakeshi Shimano
    • Masaki MukohTakeshi Shimano
    • G11B7/00
    • G11B7/1369G11B7/13925G11B2007/0006
    • Two optical discs used with a laser light having the same wavelength but having different substrate thicknesses can be handled by a single optical disc apparatus and a multilayer optical disc can also be reproduced. A refractive lens unit and liquid crystal elements are provided so as to condense laser light on an optical disc having a thin substrate thickness with a first NA and to condense laser light on an optical disc having a thick substrate thickness with a second NA smaller than the first NA. The refractive lens unit is designed such that the amount of RMS wavefront aberration is minimized with respect to an intermediate substrate thickness between the two optical discs in the range of the second NA; and the RMS wavefront aberration is 0.05λ or less with respect to the substrate thickness of the optical disc in an area outside the second NA. A liquid crystal element for compatibility corrects spherical aberration due to the difference in substrate thickness between the two optical discs. A liquid crystal element for multilayer corrects spherical aberration based on layer selection of a multilayer optical disc.
    • 与具有相同波长但具有不同基板厚度的激光一起使用的两个光盘可以由单个光盘装置处理,并且也可以再现多层光盘。 提供折射透镜单元和液晶元件,以便将激光冷凝在具有第一NA的薄的基板厚度的光盘上,并且将激光聚集在具有厚的基板厚度的光盘上,其中第二NA小于 第一个NA。 折射透镜单元被设计成使得在第二NA的范围内相对于两个光盘之间的中间基板厚度使RMS波前像差的量最小化; 相对于第二NA以外的区域的光盘的基板厚度,RMS波前像差为0.05λ以下。 用于兼容性的液晶元件由于两个光盘之间的基板厚度的差异而校正球面像差。 用于多层校正球面像差的液晶元件基于多层光盘的层选择。