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1. 发明授权

US07839752B2 Optical disc drive and objective lens for the same 有权
标题翻译：光盘驱动器和物镜相同
公开(公告)号：US07839752B2
公开(公告)日：2010-11-23
申请号：US11536004
申请日：2006-09-28
申请人： Daisuke Koreeda , Koichi Maruyama , Shuichi Takeuchi , Yoshiyuki Tashiro
发明人： Daisuke Koreeda , Koichi Maruyama , Shuichi Takeuchi , Yoshiyuki Tashiro
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。

2. 发明授权

US07468942B2 Optical pickup, optical element, and information reproducing apparatus configured for use with any of plural types of recording media 失效
标题翻译：配置为与多种类型的记录介质中的任何一种配合使用的光学拾取器，光学元件和信息再现装置
公开(公告)号：US07468942B2
公开(公告)日：2008-12-23
申请号：US10840479
申请日：2004-05-07
申请人： Katsuhiro Koike , Koichi Maruyama , Shuichi Takeuchi
发明人： Katsuhiro Koike , Koichi Maruyama , Shuichi Takeuchi
IPC分类号： G11B7/135
CPC分类号： G11B7/1275 , G11B7/1378 , G11B7/13922 , G11B2007/0006
摘要： An optical pickup has a light source for emitting a plurality of laser beams with different wavelengths; and an objective lens for focusing the laser beams emitted from the light source on recording surfaces of plural types of information recording media. A diffractive lens structure is provided in a light path of the laser beam, the structure including ring zone areas divided by a plurality of phase steps for correcting a wavefront aberration of the laser beam, a diameter of an outermost phase step of the diffractive lens structure is smaller than a second largest effective diameter of effective diameters required for reproduction of the plural types of information recording media.
摘要翻译：光拾取器具有用于发射具有不同波长的多个激光束的光源; 以及用于将从光源发射的激光束聚焦在多种类型的信息记录介质的记录表面上的物镜。衍射透镜结构设置在激光束的光路中，该结构包括由用于校正激光束的波前像差的多个相位分割的环区域，衍射透镜结构的最外相阶段的直径小于再现多种类型的信息记录介质所需的有效直径的第二大有效直径。

3. 发明申请

US20070014211A1 OPTICAL DISC DRIVE AND OBJECTIVE LENS FOR THE SAME 失效
标题翻译：光盘驱动器和目标镜头
公开(公告)号：US20070014211A1
公开(公告)日：2007-01-18
申请号：US11456943
申请日：2006-07-12
申请人： Daisuke Koreeda , Koichi Maruyama , Shuichi Takeuchi , Yoshiyuki Tashiro
发明人： Daisuke Koreeda , Koichi Maruyama , Shuichi Takeuchi , Yoshiyuki Tashiro
IPC分类号： G11B7/00
CPC分类号： G11B7/1374 , G11B2007/0006
摘要： There is provided an objective lens used for three types of optical discs including by selectively using one of three types of light beams. At least one of surfaces of the objective lens is provided with a first region converging the third light beam on a recoding surface of the third optical disc. The first region has a step structure configured to have concentric refractive surface zones and to give an optical path length difference to an incident beam at each step formed between adjacent refractive surface zones. The step structure is configured such that the optical path length difference given by each step is substantially equal to an odd multiple of a wavelength of a first light beam, and a value of differentiation of an optical path difference function defining the step structure crosses zero in a height ranging from 30% to 70% of an effective diameter of the first region.
摘要翻译：提供了一种用于三种类型的光盘的物镜，包括通过选择性地使用三种类型的光束之一。物镜的至少一个表面设置有将第三光束会聚在第三光盘的记录表面上的第一区域。第一区域具有构造成具有同心折射表面区域并且在相邻折射表面区域之间形成的每个台阶处的入射光束的光程长度差异的台阶结构。台阶结构被配置为使得由每个步骤给出的光程长度差基本上等于第一光束的波长的奇数倍，并且限定步骤结构的光程差函数的微分值在零高度为第一区域的有效直径的30％至70％。

4. 发明授权

US06898024B2 Optical system for optical pickup employing coma compensating element 失效
标题翻译：光学拾取采用昏迷补偿元件的光学系统
公开(公告)号：US06898024B2
公开(公告)日：2005-05-24
申请号：US10268802
申请日：2002-10-11
申请人： Shuichi Takeuchi , Koichi Maruyama , Takeshi Shimano
发明人： Shuichi Takeuchi , Koichi Maruyama , Takeshi Shimano
IPC分类号： G02B13/00 , G02B13/18 , G02B27/00 , G11B7/09 , G11B7/095 , G11B7/135 , G11B7/00
CPC分类号： G02B27/0025
摘要： A coma compensating element has two refraction surfaces. The refraction surfaces provide, as a whole, no aberration with respect to rays perpendicularly incident thereon, while the refraction surfaces provide coma with respect to rays obliquely incident thereon.
摘要翻译：昏迷补偿元件有两个折射面。折射表面总体上没有提供相对于垂直入射到其上的光线的像差，而折射表面相对于倾斜入射的光线提供昏迷。

5. 发明申请

US20050073937A1 Objective lens 失效
标题翻译：物镜
公开(公告)号：US20050073937A1
公开(公告)日：2005-04-07
申请号：US10956132
申请日：2004-10-04
申请人： Daisuke Koreeda , Koichi Maruyama , Shuichi Takeuchi
发明人： Daisuke Koreeda , Koichi Maruyama , Shuichi Takeuchi
IPC分类号： G11B7/00 , G11B7/135
CPC分类号： G11B7/1392 , G11B7/1353 , G11B7/1374 , G11B2007/0006
摘要： An objective lens used for recording data to and/or reproducing data from a plurality of types of optical discs having different thicknesses of cover layers. The objective lens satisfies a condition 0.02
摘要翻译：用于从具有不同厚度的覆盖层的多种类型的光盘记录数据和/或再现数据的物镜。物镜满足条件0.02

6. 发明授权

US07158468B2 Optical system for optical head 有权
标题翻译：光学头光学系统
公开(公告)号：US07158468B2
公开(公告)日：2007-01-02
申请号：US09962301
申请日：2001-09-26
申请人： Shuichi Takeuchi , Koichi Maruyama
发明人： Shuichi Takeuchi , Koichi Maruyama
IPC分类号： G11B7/135
CPC分类号： G02B5/1895 , G02B27/0037 , G02B27/4238 , G11B7/1275 , G11B7/1353 , G11B7/1374 , G11B7/139 , G11B2007/0006
摘要： An optical system for an optical head of an optical disc drive is capable of using first and second discs, protective layer of the second disc being thicker than that of the first disc, a data density of the second disc being lower than that of the first disc. A light source selectively emits first and second laser beams having first and second wavelengths, respectively. An objective lens converges the first and second beams on the first and second discs, respectively. The second beam is incident on the objective lens as diverging light, and the first beam is incident on the objective lens as a beam of which degree of divergence is smaller. A diffraction lens structure is formed in the high NA exclusive area, which compensates for aberrations of a portion of the first laser beam, and causes aberrations to a portion of the second laser beam passed therethrough.
摘要翻译：用于光盘驱动器的光头的光学系统能够使用第一和第二光盘，第二光盘的保护层比第一光盘的保护层厚，第二光盘的数据密度低于第一光盘的数据密度光盘。光源分别选择性地发射具有第一和第二波长的第一和第二激光束。物镜分别将第一和第二光束会聚在第一和第二光盘上。第二光束作为发散光入射在物镜上，第一光束作为发散度较小的光束入射到物镜上。在高NA专用区域中形成衍射透镜结构，其补偿第一激光束的一部分的像差，并且引起通过其中的第二激光束的一部分的像差。

7. 发明授权

US06873590B2 Objective lens for optical pick-up 有权
标题翻译：物镜用于光学拾取
公开(公告)号：US06873590B2
公开(公告)日：2005-03-29
申请号：US10087832
申请日：2002-03-05
申请人： Shuichi Takeuchi , Koichi Maruyama
发明人： Shuichi Takeuchi , Koichi Maruyama
IPC分类号： G02B13/00 , G11B7/00 , G11B7/125 , G11B7/135
CPC分类号： G11B7/1353 , G11B7/1275 , G11B7/1374 , G11B7/13922 , G11B2007/0006
摘要： Disclosed is an objective lens of an optical pick-up that converges light beams of two different wavelengths onto recording layers of optical discs of two different recording densities, respectively. The objective lens includes a refractive lens whose one surface is divided into a common area through which a light beam of a low NA, which is necessary and sufficient for an optical disc having low recording density, passes and a high NA exclusive area through which a light beam of a high NA, which is necessary only for an optical disc having high recording density, passes. A diffractive lens structure is formed in both the areas. The diffractive lens structure in the common area maximizes the diffraction efficiency of the first order and that in the high NA exclusive area maximizes the diffraction efficiency of the second or third order at the wavelength corresponding to the optical disc having high recording density.
摘要翻译：公开了将两种不同波长的光束分别聚焦到两个不同记录密度的光盘的记录层上的光学拾取器的物镜。物镜包括折射透镜，其折射透镜的一个表面被分成公共区域，对于具有低记录密度的光盘而言，必需且足够的低NA的光束通过该公共区域通过，并且高NA专用区域高NA的光束仅对具有高记录密度的光盘是必需的。在这两个区域中形成衍射透镜结构。公共区域中的衍射透镜结构使第一级的衍射效率最大化，并且在高NA专用区域中的衍射效率使得对应于具有高记录密度的光盘的波长的第二或第三级的衍射效率最大化。

8. 发明授权

US06781764B1 Objective lens for optical pick-up 有权
标题翻译：物镜用于光学拾取
公开(公告)号：US06781764B1
公开(公告)日：2004-08-24
申请号：US10298611
申请日：2002-11-19
申请人： Shuichi Takeuchi , Koichi Maruyama
发明人： Shuichi Takeuchi , Koichi Maruyama
IPC分类号： G02B2714
CPC分类号： G11B7/13925 , G02B27/0037 , G11B7/123 , G11B7/1275 , G11B7/1374 , G11B2007/0006
摘要： An optical system of an optical pick-up includes a light source portion that selectively emits a first laser beam (shorter wavelength) and a second laser beam (longer wavelength), and an objective lens for converging the first laser beam onto a first optical disc and for converging the second laser beam onto a second optical disc. The second optical disc has lower recording density and a thicker cover layer than the first optical disc. The divergence of the second laser beam incident on the objective lens is larger than that of the first laser beam, correcting one part of spherical aberration caused by a difference in thickness of the cover layer. A diffractive lens structure is formed on a surface of the refractive lens so that the residual part of the spherical aberration is corrected by switching the wavelength of the laser beam.
摘要翻译：光拾取器的光学系统包括选择性地发射第一激光束（较短波长）和第二激光束（较长波长）的光源部分，以及用于将第一激光束会聚到第一光盘上的物镜并且用于将第二激光束会聚到第二光盘上。第二光盘具有比第一光盘低的记录密度和更厚的覆盖层。入射到物镜上的第二激光束的发散度大于第一激光束的发散，校正由覆盖层的厚度差引起的一部分球面像差。衍射透镜结构形成在折射透镜的表面上，从而通过切换激光束的波长来校正球面像差的剩余部分。

9. 发明授权

US07280276B2 Objective lens 有权
标题翻译：物镜
公开(公告)号：US07280276B2
公开(公告)日：2007-10-09
申请号：US10937290
申请日：2004-09-10
申请人： Daisuke Koreeda , Koichi Maruyama , Shuichi Takeuchi , Naohito Sasaki
发明人： Daisuke Koreeda , Koichi Maruyama , Shuichi Takeuchi , Naohito Sasaki
IPC分类号： G11B7/00 , G02B1/10
CPC分类号： G11B7/1374 , G02B1/11 , G02B13/18
摘要： An objective lens on which a beam having parallel light fluxes is incident includes a single element lens and a reflection suppressing coating formed on at least one surface of the single element lens. The reflection suppressing coating is formed such that the reflectivity across a radius of the objective lens exhibits a local maximal value, and the reflection suppressing coating is formed to achieve the following condition: 0.6
摘要翻译：入射了具有平行光束的光束的物镜包括形成在单一元件透镜的至少一个表面上的单个元件透镜和反射抑制涂层。形成反射抑制涂层，使得物镜半径的反射率呈现局部最大值，形成反射抑制涂层以达到以下条件：＆lt;线内公式描述=“在线公式 “end =”lead“？> 0.6 其中h 1表示光轴与反射率呈现局部最大值的位置，hmax表示物镜的有效直径的光轴与最外侧位置之间的距离。

10. 发明授权

US07106525B2 Objective lens for optical pick-up 有权
标题翻译：物镜用于光学拾取
公开(公告)号：US07106525B2
公开(公告)日：2006-09-12
申请号：US10752707
申请日：2004-01-08
申请人： Shuichi Takeuchi , Koichi Maruyama
发明人： Shuichi Takeuchi , Koichi Maruyama
IPC分类号： G02B13/18 , G02B3/02 , G11B7/00 , G11B7/135
CPC分类号： G11B7/139 , G11B7/1353 , G11B7/1374 , G11B2007/0006
摘要： There is provided an objective lens for an optical pick-up used for different types of optical discs. The objective lens has at least one surface on which a plurality of annular zones are formed. The at least one surface is divided into an inner area having a low NA and an outer area having high NA outside the inner area. Further, with regard to a light beam used for a second optical disc (e.g., a DVD), an optical path difference generated between at least one of steps formed between adjacent annular zones of the plurality of annular zones within the outer area is lower by a predetermined amount than an integral multiple of a wavelength of the light beam used for the second optical disc.
摘要翻译：提供了用于不同类型光盘的光学拾取器的物镜。物镜具有形成多个环形区域的至少一个表面。所述至少一个表面被分成具有低NA的内部区域和在所述内部区域之外具有高NA的外部区域。此外，关于用于第二光盘（例如DVD）的光束，在外部区域中的多个环形区域的相邻环形区域之间形成的至少一个台阶之间产生的至少一个台阶之间产生的光程差较小比用于第二光盘的光束的波长的整数倍的预定量。

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