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1.发明授权Optical pick-up and objective lens for use with different types of optical discs 失效用于不同类型光盘的光学拾取和物镜公开(公告)号：US07430159B2
公开(公告)日：2008-09-30
申请号：US11036989
申请日：2005-01-19
申请人： Daisuke Koreeda , Koichi Maruyama
发明人： Daisuke Koreeda , Koichi Maruyama
IPC分类号： G11B7/00
CPC分类号： G11B7/1353 , G11B7/1275 , G11B7/1374 , G11B2007/0006
摘要： There is provided an optical pick-up used for recording data to and/or reproducing data from at least three types of optical discs having at least two different thicknesses of cover layers. The optical pick-up includes light sources and an objective lens. A thickness t1 of a first optical disc, a thickness t2 of a second optical disc, and a thickness t3 of a third optical disc satisfy a relationship t1≦t2 NA3. Further, a first light beam for the first optical disc is incident on the objective lens as a converging light beam, and the second and third light beams for the second and third optical discs are incident on the objective lens as diverging light beams, respectively. Given that magnification of the objective lens is m1 when the first optical disc is used, magnification of the objective lens is m2 when the second optical disc is used, and magnification of the objective lens is m3 when the first optical disc is used, following conditions are satisfied: m1>0, m3
摘要翻译： 提供了一种用于将数据记录到至少三种类型的具有至少两个不同厚度的覆盖层厚度的光盘中的数据的光学拾取器。 光学拾取器包括光源和物镜。 第一光盘的厚度t 1，第二光盘的厚度t 2和第三光盘的厚度t 3满足关系t 1 <= t 2
= NA 2> NA 3。 此外，用于第一光盘的第一光束作为会聚光束入射在物镜上，并且用于第二和第三光盘的第二和第三光束分别作为发散光束入射在物镜上。 假设当使用第一光盘时物镜的放大倍数为m 1，当使用第二光盘时物镜的倍率为m 2，并且当使用第一光盘时物镜的倍率为m 3 满足以下条件：m 1> 0，m 3 -
公开(公告)号：US08072694B2
公开(公告)日：2011-12-06
申请号：US12046751
申请日：2008-03-12
IPC分类号： G02B3/08
CPC分类号： G11B7/1353 , G11B7/1374 , G11B7/13922 , G11B2007/0006
摘要： There is provided an objective lens used for a plurality of types of optical discs having a front surface and a rear surface, each of which includes an inner region and an outer region. The outer region has a surface shape which suppresses a coma caused when a beam used for a first optical disc is incident thereon obliquely with respect to an optical axis of the objective lens. The inner region is configured such that, at a boundary position between the inner region and the outer region, the coma caused when a beam used for a second optical disc is incident on the inner region obliquely at a first angle with respect to the optical axis is less than the coma caused when the beam used for the second optical disc is incident on the outer region obliquely at the first angle with respect to the optical axis. Further, an inclination θ2A of the inner region and an inclination θ2B of the outer region of the rear surface satisfy a condition: −2.5
摘要翻译： 提供了一种用于具有前表面和后表面的多种类型的光盘的物镜，每个光盘包括内部区域和外部区域。 外部区域具有抑制当用于第一光盘的光束相对于物镜的光轴倾斜入射时引起的彗差的表面形状。 内部区域被构造成使得在内部区域和外部区域之间的边界位置处，当用于第二光盘的光束相对于光轴以第一角度倾斜地入射到内部区域时引起的彗形像 小于当用于第二光盘的光束相对于光轴以第一角度倾斜地入射到外部区域时引起的昏迷。 此外，内表面的倾斜度和外面的面积和外表面的外表面部分2B的条件是满足以下条件：-2.5 <＆amp; t; 2B-＆thetas; 2A <0.0。 。 。 （1）。
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3.发明授权Optical information recording/reproducing device, optical element for the same, and design method of the same 失效光信息记录/再现装置，用于其的光学元件及其设计方法公开(公告)号：US07872958B2
公开(公告)日：2011-01-18
申请号：US11752386
申请日：2007-05-23
IPC分类号： G11B7/135
CPC分类号： G11B7/1374 , G11B7/1275 , G11B7/1353 , G11B7/13922 , G11B2007/0006
摘要： In an optical information recording/reproducing device which executes information reading or writing on multiple types of optical discs having different data densities by selectively using first through third light beams having first through third wavelengths, respectively, at least one side of an optical element is provided with a step structure including a plurality of concentric refracting surfaces and steps between them. The steps include first steps each giving a first optical path length difference specified by a first optical path difference function, second steps each giving a second optical path length difference specified by a second optical path difference function, and special steps each giving an optical path length difference obtained by the sum or difference of/between the first and second optical path length differences. Annular zone widths between adjacent steps are set at 10 times the first wavelength or more.
摘要翻译： 在通过选择性地使用具有第一至第三波长的第一至第三光束执行信息读取或写入具有不同数据密度的多种类型的光盘的光学信息记录/再现装置中，分别提供光学元件的至少一侧 具有包括多个同心折射表面和它们之间的台阶的台阶结构。 这些步骤包括第一步骤，每个步骤给出由第一光程差函数指定的第一光程长度差，每个给出由第二光程差函数指定的第二光程长度差的第二步，以及各自给出光程长度 通过第一和第二光程长度差的和/之差获得的差。 相邻步骤之间的环带宽度设定为第一波长的10倍以上。
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公开(公告)号：US07742370B2
公开(公告)日：2010-06-22
申请号：US11419810
申请日：2006-05-23
IPC分类号： G11B7/00
CPC分类号： G11B7/1275 , G02B5/1876 , G02B5/1895 , G11B7/1367 , G11B7/1374 , G11B7/13922 , G11B2007/0006
摘要： An objective lens, for an optical information read/write device that performs read/write operations on each of a plurality of optical discs using a corresponding one of three laser beams having first, second, and third wavelengths λ1, λ2, and λ3 (nm) satisfying a relationship λ1
摘要翻译： 一种用于光信息读/写装置的物镜，用于使用具有第一，第二和第三波长λ1，λ2和λ3（nm）的三个激光束中的相应一个对多个光盘中的每一个进行读/写操作 ）分别包括具有多个环形折射表面区域的相移结构，物镜的至少一个表面被同心分开。 物镜由符合条件40＆nlE;＆ngr; d＆nlE; 80的阿贝数和材料制成。 相移结构在每对相邻的折射表面区域之间具有步骤，其给出与入射激光束的光程差，从而满足条件2N + 1.00 <| | Dgr; OPD /λ1| <2N + 1.30， 其中＆Dgr; OPD表示步长给出具有第一波长的激光束的光程差（nm），N表示非负整数。
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公开(公告)号：US20060181978A1
公开(公告)日：2006-08-17
申请号：US11352324
申请日：2006-02-13
IPC分类号： G11B7/00
CPC分类号： G11B7/1367 , G11B7/13922 , G11B2007/0006
摘要： A optical system of an optical pick-up is provided. The optical system includes an optical element including at least a phase shift surface among the surfaces thereof, and located closer to a light source than the objective lens. In this configuration, t1≦t2 is satisfied, where t1 represents a thickness of a cover layer of a first optical disc for which a first laser beam is employed, and t2 a thickness of a cover layer of a second optical disc for which a second laser beam, having a longer wavelength than the first laser beam, is employed. NA1≧NA2 is satisfied, where NA1 represents a numerical aperture for the first optical disc, and NA 2 the numerical aperture for the second optical disc. The phase shift surface includes a first region that converges the first laser beam on a recording surface of the first optical disc, and the second laser beam on a recording surface of the second optical disc. The first region includes at least an annular zone structure having an annular zone group including a step that gives an additional optical path length to the first laser beam generally by two wavelengths, with respect to an inner refracting surface at a boundary between adjacent refracting surfaces, and a return step portion located at an outer position of the annular zone group. The return step includes a step that gives an additional optical path length to the first laser beam generally by three wavelengths with respect to an inner refracting surface located inside of the return step, in an opposite direction to the step of the annular zone group.
摘要翻译： 提供光学拾取器的光学系统。 光学系统包括在其表面中至少包括相移表面并且位于比物镜更靠近光源的光学元件。 在这种配置中，满足t 1 <= t 2，其中t 1表示使用第一激光束的第一光盘的覆盖层的厚度，t 2表示第二光学器件的覆盖层的厚度 使用具有比第一激光束长的波长的第二激光束的光盘。 NA 1> = NA 2，其中NA 1表示第一光盘的数值孔径，NA 2表示第二光盘的数值孔径。 相移表面包括将第一激光束会聚在第一光盘的记录表面上的第一区域和在第二光盘的记录表面上的第二激光束。 第一区域至少包括具有环形区域组的环形区域结构，所述环形区域组包括相对于相邻折射表面之间的边界处的内部折射表面给予第一激光束的附加光程长度通常为两个波长的步骤， 以及位于所述环形区域组的外部位置的返回台阶部。 返回步骤包括以与环形区域组的台阶相反的方向相对于位于返回步骤内部的内部折射表面通常相对于第一激光束附加光路长度的步骤。
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公开(公告)号：US20060114796A1
公开(公告)日：2006-06-01
申请号：US11289386
申请日：2005-11-30
IPC分类号： G11B7/00
CPC分类号： G11B7/1367 , G02B27/42 , G02B27/4238 , G02B27/4294 , G11B7/1374 , G11B7/13922 , G11B2007/0006
摘要： A method of designing an optical element to be used for an optical system in which each of a plurality of light beams having different design wavelengths passes through the optical element is provided. The method includes determining at least two types of optical path difference functions including first and second optical path difference functions in such a manner that proportion, brought by the first optical path difference function, between diffraction orders at which diffraction efficiencies of the plurality of light beams are maximized is different from proportion, brought by the second optical path difference function, between diffraction orders at which diffraction efficiencies of the plurality of light beams are maximized, and obtaining a shape defined by combining the at least two types of optical path difference functions so as to apply the obtained shape to at least one surface of surfaces of the optical element.
摘要翻译： 提供一种设计用于光学系统的光学元件的方法，其中具有不同设计波长的多个光束中的每一个通过光学元件。 该方法包括确定包括第一和第二光程差函数的至少两种类型的光程差函数，使得由第一光程差函数带来的比例在衍射级之间，衍射级之间的多个光束的衍射效率 最大化不同于由第二光程差函数引起的比例，在多个光束的衍射效率最大化的衍射级之间，并且获得通过组合至少两种类型的光程差函数而定义的形状 以将获得的形状应用于光学元件的表面的至少一个表面。
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公开(公告)号：US06900949B2
公开(公告)日：2005-05-31
申请号：US10761318
申请日：2004-01-22
CPC分类号： G11B7/1353 , G11B7/1374 , G11B7/1378 , G11B7/13922 , G11B2007/0006
摘要： An optical system of an optical pick-up for a plurality of types of optical discs with a corresponding plurality of light sources. A first coupling lens that is used at least for the first optical disc, and an objective lens that is used for the plurality of types of optical discs. A beam for the first optical disc emitted by the plurality of light sources passes through the first coupling lens and is incident on the objective lens as a diverging beam. The diverging beam being given spherical aberration by the coupling lens. When the objective lens shift occurs, a coma component relating to the spherical aberration of the diverging beam which is shifted with respect to the objective lens due to the shift of the objective lens is canceled by a coma generated by the objective lens and the cover layer of the first optical disc.
摘要翻译： 一种用于具有相应多个光源的多种类型的光盘的光学拾取器的光学系统。 至少用于第一光盘的第一耦合透镜和用于多种类型的光盘的物镜。 用于由多个光源发射的第一光盘的光束穿过第一耦合透镜并作为发散光束入射在物镜上。 发散光束由耦合透镜给出球面像差。 当发生物镜偏移时，由于物镜的偏移而相对于物镜偏移的发散光束的球面像差的彗差成分被物镜和覆盖层产生的彗形消除 的第一光盘。
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公开(公告)号：US06822800B2
公开(公告)日：2004-11-23
申请号：US10456674
申请日：2003-06-09
申请人： Daisuke Koreeda , Koichi Maruyama
发明人： Daisuke Koreeda , Koichi Maruyama
IPC分类号： G02B2700
CPC分类号： G11B7/1374 , G02B3/08 , G02B7/028 , G11B7/13922
摘要： An objective lens for an optical pickup has a single lens element. One surface of the objective lens is divided into a central area and a peripheral area, and a step providing a level difference along a direction of the optical axis is formed at a boundary therebetween. The step provides a phase shift between light passing through the central area and the peripheral area. The level difference is formed such that a thickness on the peripheral area side is greater than a thickness on the central area side at the boundary. In one case, the objective lens satisfies a condition: 0.83
摘要翻译： 用于光学拾取器的物镜具有单个透镜元件。 物镜的一个表面被分成中心区域和周边区域，并且在它们之间的边界处形成沿着光轴方向提供水平差的台阶。 该步骤提供穿过中心区域的光和外围区域之间的相移。 水平差形成为周边区域侧的厚度大于边界处的中央区域侧的厚度。 在一种情况下，物镜满足条件：其中hx是边界的半径，hmax是限定由台阶形成的表面的数值孔径的有效半径。
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公开(公告)号：US07839752B2
公开(公告)日：2010-11-23
申请号：US11536004
申请日：2006-09-28
IPC分类号： G11B7/135
CPC分类号： G11B7/1374 , G11B7/1275 , G11B7/13922 , G11B2007/0006
摘要： There is provided an optical disc drive for recordation/reproduction for three types of optical discs by selectively using one of three types of light beams. The optical disc drive comprises an objective lens. The objective lens has a step structure which gives an optical path length difference to an incident beam at each step. When the third laser beam passes through the objective lens, the objective lens produces normal diffraction order light converging to a recording surface of the third optical disc and undesired diffraction order light converging to a point deviating from the recording surface of the third optical disc. A distance from a point to which the normal diffraction order light converges to a point to which the undesired diffraction order light converges is larger than or equal to twice a pull-in range of a focus error signal obtained when the third optical disc is used.
摘要翻译： 通过选择性地使用三种类型的光束之一，提供了用于三种类型的光盘的记录/再现的光盘驱动器。 光盘驱动器包括物镜。 物镜具有在每个步骤中给入射光束的光程长度差的阶梯结构。 当第三激光束通过物镜时，物镜产生会聚到第三光盘的记录表面的正常衍射级光，并且不期望的衍射级光会聚到偏离第三光盘的记录表面的点。 从法线衍射级光收敛到不期望的衍射级光会聚的点的距离大于或等于当使用第三光盘时获得的聚焦误差信号的拉入范围的两倍。
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公开(公告)号：US07239598B2
公开(公告)日：2007-07-03
申请号：US10867736
申请日：2004-06-16
申请人： Koichi Maruyama , Daisuke Koreeda
发明人： Koichi Maruyama , Daisuke Koreeda
IPC分类号： G11B7/00
CPC分类号： G11B7/1367 , G11B7/1275 , G11B7/1353 , G11B7/1374 , G11B2007/0006
摘要： There is provided an objective lens for an optical pick-up which is used to record/reproduce data to/from at least three types of optical discs. Thicknesses t1, t2 and t3 of cover layers of first, second third optical discs are t1≅0.6 mm, t2≅0.6 mm, and t3≅1.2 mm. Numerical apertures NA1, NA2 and NA3 for the first, second and third optical discs satisfy a relationship NA1≧NA2>NA3. When the first optical disc is used, a substantially collimated light beam is incident on the objective lens. When the second or third optical disc is used, a diverging beam is incident on the objective lens. With regard to magnifications M1, M2 and M3 and focal lengths f1, f2 and f3 of the objective lens for the first, second and third optical discs, the following conditions (1), (2) and (3) are satisfied: −0.02
摘要翻译： 提供了用于光学拾取器的物镜，其用于向/从至少三种类型的光盘记录/再现数据。 第一，第二三个光盘的覆盖层的厚度t 1，t 2和t 3分别为t 1≅0.6mm，t 2≅0.6 mm，t 3≅1.2mm。 第一，第二和第三光盘的数值孔径NA 1，NA 2和NA 3满足关系NA 1> = NA 2> NA 3。 当使用第一光盘时，基本上准直的光束入射到物镜上。 当使用第二或第三光盘时，发散光束入射到物镜上。 关于用于第一，第二和第三光盘的物镜的放大率M 1，M 2和M 3以及焦距f 1，f 2和f 3，以下条件（1），（2）和（3 ）满足：<？in-line-formula description =“In-line formula”end =“lead”？> - 0.02
<？in-line-formula description =“In-line Formulas”end =“lead”？> - 0.10 <？in-line-formula description =”In-line Formulas“end =”lead“？> - 0.29
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