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公开(公告)号：US08259555B2
公开(公告)日：2012-09-04
申请号：US12531193
申请日：2008-04-15
CPC分类号： G11B7/1353 , G11B7/1367 , G11B7/13922 , G11B2007/0006
摘要： 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.
摘要翻译： 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。
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公开(公告)号：US08154976B2
公开(公告)日：2012-04-10
申请号：US12550997
申请日：2009-08-31
IPC分类号： G11B7/00
CPC分类号： G11B7/1353 , G11B7/1362 , G11B7/1367 , G11B2007/0006
摘要： Disclosed is a reflecting wavelength plate that deflects and reflects a light path and adds a phase difference with respect to plural incident light having different wavelengths. The reflecting wavelength plate includes a substrate; a reflecting film laminated on the substrate; and a sub-wavelength concavo-convex structure that is laminated on the reflecting film and has a pitch less than or equal to the shortest wavelength of the plural incident light. The filling factor and the groove depth of the sub-wavelength concavo-convex structure are determined so as to add the phase difference obtained by (kπ)/8, where k is an integer, to the plural incident light having the different wavelengths.
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公开(公告)号：US20100135130A1
公开(公告)日：2010-06-03
申请号：US12531193
申请日：2008-04-15
IPC分类号： G11B7/00
CPC分类号： G11B7/1353 , G11B7/1367 , G11B7/13922 , G11B2007/0006
摘要： 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.
摘要翻译： 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。
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公开(公告)号：US07502300B2
公开(公告)日：2009-03-10
申请号：US10878343
申请日：2004-06-29
IPC分类号： G11B7/135
CPC分类号： G11B7/1367 , G11B7/1275 , G11B7/1353 , G11B7/139 , G11B7/13922 , G11B2007/0006
摘要： 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.
摘要翻译： 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。
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5.发明授权Optical element, polarization filter, optical isolator, and optical apparatus 有权光学元件，偏振滤光器，光隔离器和光学设备公开(公告)号：US08830585B2
公开(公告)日：2014-09-09
申请号：US13255171
申请日：2010-04-06
CPC分类号： G02B27/28 , G02B5/3025
摘要： 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.
摘要翻译： 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。
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6.发明授权Reflecting wavelength plate and optical pickup using reflecting wavelength plate 有权使用反射波片反射波长板和光学拾取器公开(公告)号：US08154977B2
公开(公告)日：2012-04-10
申请号：US12842369
申请日：2010-07-23
IPC分类号： G11B7/00
CPC分类号： G11B7/1353 , G11B7/1362 , G11B7/1367 , G11B2007/0006
摘要： Disclosed is a reflecting wavelength plate that deflects and reflects a light path and adds a phase difference with respect to plural incident light having different wavelengths. The reflecting wavelength plate includes a substrate; a reflecting film laminated on the substrate; and a sub-wavelength concavo-convex structure that is laminated on the reflecting film and has a pitch less than or equal to the shortest wavelength of the plural incident light. The filling factor and the groove depth of the sub-wavelength concavo-convex structure are determined so as to add the phase difference obtained by (kπ)/8, where k is an integer, to the plural incident light having the different wavelengths.
摘要翻译： 公开了一种反射波长板，其使光路偏转并反射，并且相对于具有不同波长的多个入射光增加相位差。 反射波长板包括基板; 层叠在基板上的反射膜; 以及层叠在反射膜上并具有小于或等于多个入射光的最短波长的间距的亚波长凹凸结构。 确定亚波长凹凸结构的填充因子和凹槽深度，以便将具有不同波长的多个入射光中的（k＆pgr）/ 8（其中k是整数）获得的相位差相加。
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7.发明申请OPTICAL ELEMENT, POLARIZATION FILTER, OPTICAL ISOLATOR, AND OPTICAL APPARATUS 有权光学元件，偏振滤光片，光学隔离器和光学设备公开(公告)号：US20120002280A1
公开(公告)日：2012-01-05
申请号：US13255171
申请日：2010-04-06
CPC分类号： G02B27/28 , G02B5/3025
摘要： 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.
摘要翻译： 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。
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公开(公告)号：US20050025028A1
公开(公告)日：2005-02-03
申请号：US10878343
申请日：2004-06-29
CPC分类号： G11B7/1367 , G11B7/1275 , G11B7/1353 , G11B7/139 , G11B7/13922 , G11B2007/0006
摘要： 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.
摘要翻译： 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。
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公开(公告)号：US08178010B2
公开(公告)日：2012-05-15
申请号：US12712308
申请日：2010-02-25
申请人： Hideaki Hirai , Kazuhiro Umeki
发明人： Hideaki Hirai , Kazuhiro Umeki
CPC分类号： G11B7/139 , G02B5/1809 , G02B5/1847 , G02B27/4238 , G11B7/123 , G11B7/1353 , G11B7/1381 , G11B2007/0006
摘要： An optical device having a sub-wavelength grating formed in a specified region is disclosed that is able to prevent wave front degradation accompanying a phase difference of a polarized light beam passing through the optical device. The optical device includes a circular-belt-like region where the sub-wavelength diffraction grating is formed, and a center portion where the sub-wavelength diffraction grating is not formed. A vertically polarized light beam used for operations on a blue-light optical recording medium A has a phase difference in the sub-wavelength diffraction grating to be an integral multiple of 2π and hence is transmitted through the sub-wavelength diffraction grating. A horizontally polarized light beam used for operations on a blue-light optical recording medium is diffracted by the sub-wavelength diffraction grating. The light path length L1 of the light beam passing through the circular-belt-like region is the same as that of the light beam passing through the center portion without the sub-wavelength grating.
摘要翻译： 公开了一种具有形成在特定区域中的子波长光栅的光学器件，其能够防止伴随通过光学器件的偏振光束的相位差的波前劣化。 光学器件包括形成亚波长衍射光栅的圆形带状区域和未形成亚波长衍射光栅的中心部分。 用于在蓝光光记录介质A上操作的垂直偏振光束在亚波长衍射光栅中的相位差为2＆pgr的整数倍; 因此通过亚波长衍射光栅传输。 用于在蓝光光记录介质上操作的水平偏振光束被亚波长衍射光栅衍射。 通过圆形带状区域的光束的光路长度L1与没有亚波长光栅的通过中心部分的光束的光路长度L1相同。
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公开(公告)号：US07894133B2
公开(公告)日：2011-02-22
申请号：US11868048
申请日：2007-10-05
IPC分类号： G02B5/30
CPC分类号： G02B5/1809 , G02B5/1866 , G02B5/3083
摘要： A disclosed optical element includes: a transparent substrate; a subwavelength structure layer disposed on the transparent substrate, the subwavelength structure layer having a refractive index different from a refractive index of the transparent substrate; a minute concave and convex structure of one-dimensional grating formed on the subwavelength structure layer with a subwavelength period smaller than a wavelength to be used, where a concave portion reaches a boundary surface between the transparent substrate and the subwavelength structure layer; and an open hole portion formed on a subwavelength structure layer side of the transparent substrate so as to communicate with the concave portion of the minute structure and to be arranged with the same period as in the minute structure of one-dimensional grating. At least at the open hole portion, a refractive index relative to an incident light is changed in a direction orthogonal to the boundary surface.
摘要翻译： 所公开的光学元件包括：透明基板; 设置在所述透明基板上的亚波长结构层，所述亚波长结构层的折射率不同于所述透明基板的折射率; 形成在亚波长结构层上的亚波长时间段小于要使用的波长的一维光栅的微小凹凸结构，其中凹部到达透明基板和亚波长结构层之间的边界面; 以及开口部，形成在透明基板的亚波长结构层侧，以与微细结构的凹部连通并且与一维光栅的微小结构相同的周期配置。 至少在开孔部分，相对于入射光的折射率在与边界表面正交的方向上变化。
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