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    • 3. 发明授权
    • Optical pickup and optical information processing device
    • 光学拾取和光学信息处理设备
    • US08259555B2
    • 2012-09-04
    • US12531193
    • 2008-04-15
    • Yukiko HamanoHideaki HiraiToshimichi NasukawaKazuhiro Umeki
    • Yukiko HamanoHideaki HiraiToshimichi NasukawaKazuhiro Umeki
    • G11B7/135G11B7/00
    • G11B7/1353G11B7/1367G11B7/13922G11B2007/0006
    • A disclosed optical pickup includes an aberration correction unit with a phase shifter surface. On the phase shifter surface, rectangular or staircase-like steps are formed in a concentric manner around an optical axial center, in certain regions where a light beam passes through. The steps have different heights in the optical axial direction. A light beam having a wavelength of 405 nm is directly transmitted through the steps so that a phase difference is applied for correcting spherical aberration that occurs on a first optical recording medium. A light beam that passes through an annular region without any steps is focused on a second optical recording medium. A light beam that passes through an outside region is focused by an object lens on the second optical recording medium, and is not focused on the first optical recording medium.
    • 所公开的光拾取器包括具有移相器表面的像差校正单元。 在移相器表面上,在光束通过的某些区域中,围绕光轴心同心地形成矩形或阶梯状台阶。 台阶在光轴方向具有不同的高度。 波长为405nm的光束直接透过该步骤,使得施加相位差来校正出现在第一光学记录介质上的球面像差。 通过没有任何步骤的环形区域的光束被聚焦在第二光学记录介质上。 通过外部区域的光束被物镜聚焦在第二光学记录介质上,并且不聚焦在第一光学记录介质上。
    • 7. 发明授权
    • Optical pickup and optical data processing apparatus
    • 光学拾取和光学数据处理装置
    • US07502300B2
    • 2009-03-10
    • US10878343
    • 2004-06-29
    • Hideaki HiraiToshimichi NasukawaKazuhiro Umeki
    • Hideaki HiraiToshimichi NasukawaKazuhiro Umeki
    • G11B7/135
    • G11B7/1367G11B7/1275G11B7/1353G11B7/139G11B7/13922G11B2007/0006
    • An optical pickup is disclosed that includes a simplified phase correction element enabling sufficient correction of spherical aberration and realization of compatibility with blue-light, DVD-type and CD-type optical recording media with a two-stage numerical aperture switching operation. The phase correction element includes a phase shifting part and a diffraction part superposed on the phase shifting part. The phase shifting part has stepwise concentric circular regions including more than two stages. The diffraction part includes periodically arranged projecting and depressed portions formed on the phase shifting part. The phase shifting part suppresses spherical aberration related to red light used for a DVD-type optical recording medium when the object lens is optimized relative to blue light used for a blue-light optical recording medium. The diffraction part sets a most appropriate NA to each of the blue-light, DVD-type and the CD-type optical recording media by switching the numerical aperture.
    • 公开了一种光拾取器,其包括简化的相位校正元件,其能够进行球面像差的足够校正,并实现与具有两级数值孔径切换操作的蓝光,DVD型和CD型光学记录介质的兼容性。 相位校正元件包括叠加在相移部上的相移部和衍射部。 相移部分具有包括多于两个阶段的逐步同心圆形区域。 衍射部分包括形成在相移部分上的周期性地布置的突出和凹陷部分。 当相对于用于蓝光光记录介质的蓝光优化物镜时,相移部抑制与用于DVD型光记录介质的红光相关的球面像差。 通过切换数值孔径,衍射部分为每个蓝光DVD类型和CD型光记录介质设置最合适的NA。
    • 8. 发明授权
    • Optical element, polarization filter, optical isolator, and optical apparatus
    • 光学元件,偏振滤光器,光隔离器和光学设备
    • US08830585B2
    • 2014-09-09
    • US13255171
    • 2010-04-06
    • Hideaki HiraiToshimichi NasukawaKazuhiro Umeki
    • Hideaki HiraiToshimichi NasukawaKazuhiro Umeki
    • G02B5/30G02B27/28
    • G02B27/28G02B5/3025
    • An optical element transmits incident light having a particular polarization direction mainly by 0-order transmission and diffracts incident light having a perpendicular polarization direction. The optical element includes a periodic structure having a period equal to or greater than the wavelength of the incident light. The periodic structure includes first and second subwavelength concave-convex structures formed perpendicularly adjacent to each other in each period of the periodic structure. The first and the second subwavelength concave-convex structures have a period less than the wavelength of the incident light. A filling factor and a groove depth of the first and the second subwavelength concave-convex structures are determined such that they have the same effective refraction index with respect to the incident light having the particular polarization direction and a phase difference π with respect to the incident light having the particular polarization direction.
    • 光学元件主要通过0阶透射来透射具有特定偏振方向的入射光,并衍射具有垂直偏振方向的入射光。 光学元件包括具有等于或大于入射光的波长的周期的周期性结构。 周期性结构包括在周期性结构的每个周期中彼此​​垂直相邻形成的第一和第二亚波长凹凸结构。 第一和第二亚波长凹凸结构的周期小于入射光的波长。 确定第一和第二亚波长凹凸结构的填充因子和凹槽深度,使得它们相对于具有特定偏振方向的入射光和相位差pgr具有相同的有效折射率; 相对于具有特定偏振方向的入射光。