公开(公告)号：US07606134B2

公开(公告)日：2009-10-20

申请号：US11879310

申请日：2007-07-17

申请人： Sumito Nishioka ,  Nobuo Ogata ,  Ikuo Nakano

发明人： Sumito Nishioka ,  Nobuo Ogata ,  Ikuo Nakano

IPC分类号： G11B7/00

CPC分类号： G11B7/1378 ,  G02B27/42 ,  G11B7/1275 ,  G11B7/1353 ,  G11B7/139 ,  G11B7/13925 ,  G11B2007/0006

摘要： An optical pickup includes: a first projector for projecting a first light beam of a first wavelength so as to record and reproduce information with respect to an optical disk having a first light transmissive layer; a second projector for projecting a second light beam of a second wavelength longer than the first wavelength so as to record and reproduce information with respect to an optical disk having a second light transmissive layer; an objective lens common to the first and second light beams; and a diffraction optical element made of a lens with a diffraction grating and a refracting face and disposed in an optical path between the first and second projectors and the objective lens. The diffraction optical element is set to satisfy a predetermined equation. As a result, an optical pickup is realized that uses a single focusing means to focus light beams of different wavelengths, so as to record and reproduce information with respect to different kinds of optical disks (recording media) respectively having light transmissive layers of different thicknesses and respectively using different optimum wavelengths of light for reproducing.

摘要翻译： 一种光学拾取器包括：第一投影仪，用于投影第一波长的第一光束，以便相对于具有第一透光层的光盘记录和再现信息; 第二投影仪，用于投射比第一波长长的第二波长的第二光束，以便相对于具有第二透光层的光盘记录和再现信息; 第一和第二光束共同的物镜; 以及由具有衍射光栅和折射面的透镜制成的衍射光学元件，并设置在第一和第二投影仪与物镜之间的光路中。 衍射光学元件被设定为满足预定的等式。 结果，实现了使用单个聚焦装置来聚焦不同波长的光束的光学拾取器，以便分别记录和再现分别具有不同厚度的透光层的不同种类的光盘（记录介质）的信息 并分别使用不同的最佳波长的光进行再现。

公开(公告)号：US07471610B2

公开(公告)日：2008-12-30

申请号：US11879311

申请日：2007-07-17

申请人： Sumito Nishioka ,  Nobuo Ogata ,  Ikuo Nakano

发明人： Sumito Nishioka ,  Nobuo Ogata ,  Ikuo Nakano

IPC分类号： G11B7/00

CPC分类号： G11B7/1378 ,  G02B27/42 ,  G11B7/1275 ,  G11B7/1353 ,  G11B7/139 ,  G11B7/13925 ,  G11B2007/0006

摘要： An optical pickup includes: a first projector for projecting a first light beam of a first wavelength so as to record and reproduce information with respect to an optical disk having a first light transmissive layer; a second projector for projecting a second light beam of a second wavelength longer than the first wavelength so as to record and reproduce information with respect to an optical disk having a second light transmissive layer; an objective lens common to the first and second light beams; and a diffraction optical element made of a lens with a diffraction grating and a refracting face and disposed in an optical path between the first and second projectors and the objective lens. The diffraction optical element is set to satisfy a predetermined equation. As a result, an optical pickup is realized that uses a single focusing means to focus light beams of different wavelengths, so as to record and reproduce information with respect to different kinds of optical disks (recording media) respectively having light transmissive layers of different thicknesses and respectively using different optimum wavelengths of light for reproducing.

摘要翻译： 一种光学拾取器包括：第一投影仪，用于投影第一波长的第一光束，以便相对于具有第一透光层的光盘记录和再现信息; 第二投影仪，用于投射比第一波长长的第二波长的第二光束，以便相对于具有第二透光层的光盘记录和再现信息; 第一和第二光束共同的物镜; 以及由具有衍射光栅和折射面的透镜制成的衍射光学元件，并设置在第一和第二投影仪与物镜之间的光路中。 衍射光学元件被设定为满足预定的等式。 结果，实现了使用单个聚焦装置来聚焦不同波长的光束的光学拾取器，以便记录和再现分别具有不同厚度的透光层的不同种类的光盘（记录介质）的信息 并分别使用不同的最佳波长的光进行再现。

公开(公告)号：US20080013435A1

公开(公告)日：2008-01-17

申请号：US11879310

申请日：2007-07-17

申请人： Sumito Nishioka ,  Nobuo Ogata ,  Ikuo Nakano

发明人： Sumito Nishioka ,  Nobuo Ogata ,  Ikuo Nakano

IPC分类号： G11B7/00

CPC分类号： G11B7/1378 ,  G02B27/42 ,  G11B7/1275 ,  G11B7/1353 ,  G11B7/139 ,  G11B7/13925 ,  G11B2007/0006

摘要： An optical pickup includes: a first projector for projecting a first light beam of a first wavelength so as to record and reproduce information with respect to an optical disk having a first light transmissive layer; a second projector for projecting a second light beam of a second wavelength longer than the first wavelength so as to record and reproduce information with respect to an optical disk having a second light transmissive layer; an objective lens common to the first and second light beams; and a diffraction optical element made of a lens with a diffraction grating and a refracting face and disposed in an optical path between the first and second projectors and the objective lens. The diffraction optical element is set to satisfy a predetermined equation. As a result, an optical pickup is realized that uses a single focusing means to focus light beams of different wavelengths, so as to record and reproduce information with respect to different kinds of optical disks (recording media) respectively having light transmissive layers of different thicknesses and respectively using different optimum wavelengths of light for reproducing.

公开(公告)号：US07260047B2

公开(公告)日：2007-08-21

申请号：US10625709

申请日：2003-07-22

申请人： Sumito Nishioka ,  Nobuo Ogata ,  Ikuo Nakano

发明人： Sumito Nishioka ,  Nobuo Ogata ,  Ikuo Nakano

IPC分类号： G11B7/00

CPC分类号： G11B7/1378 ,  G02B27/42 ,  G11B7/1275 ,  G11B7/1353 ,  G11B7/139 ,  G11B7/13925 ,  G11B2007/0006

摘要： An optical pickup includes: a first projector for projecting a first light beam of a first wavelength so as to record and reproduce information with respect to an optical disk having a first light transmissive layer; a second projector for projecting a second light beam of a second wavelength longer than the first wavelength so as to record and reproduce information with respect to an optical disk having a second light transmissive layer; an objective lens common to the first and second light beams; and a diffraction optical element made of a lens with a diffraction grating and a refracting face and disposed in an optical path between the first and second projectors and the objective lens. The diffraction optical element is set to satisfy a predetermined equation. As a result, an optical pickup is realized that uses a single focusing means to focus light beams of different wavelengths, so as to record and reproduce information with respect to different kinds of optical disks (recording media) respectively having light transmissive layers of different thicknesses and respectively using different optimum wavelengths of light for reproducing.

摘要翻译： 一种光学拾取器包括：第一投影仪，用于投影第一波长的第一光束，以便相对于具有第一透光层的光盘记录和再现信息; 第二投影仪，用于投射比第一波长长的第二波长的第二光束，以便相对于具有第二透光层的光盘记录和再现信息; 第一和第二光束共同的物镜; 以及由具有衍射光栅和折射面的透镜制成的衍射光学元件，并设置在第一和第二投影仪与物镜之间的光路中。 衍射光学元件被设定为满足预定的等式。 结果，实现了使用单个聚焦装置来聚焦不同波长的光束的光学拾取器，以便分别记录和再现分别具有不同厚度的透光层的不同种类的光盘（记录介质）的信息 并分别使用不同的最佳波长的光进行再现。

公开(公告)号：US20050179804A1

公开(公告)日：2005-08-18

申请号：US11107243

申请日：2005-04-14

申请人： Ikuo Nakano ,  Eiji Yamada

发明人： Ikuo Nakano ,  Eiji Yamada

IPC分类号： G11B7/00 ,  G11B7/09 ,  G11B7/135 ,  H04N5/225

CPC分类号： G11B7/13925 ,  G11B7/1374 ,  G11B7/1376 ,  G11B2007/0013 ,  G11B2007/13727

摘要： An optical recording/reproducing apparatus is arranged so that, upon recording or reproducing a recording medium having a plurality of recording layers, the gap of the lens groups at the time of forming a converged light spot on this first recording layer is DIS (1), the gap of the lens groups at the time of forming the converged light spot on the N-th layer (the farthest layer from the surface of the recording medium) is DIS (N) and the neutral point of the spherical-aberration correcting mechanism is set at a position satisfying the following expression: lens group gap dst (3)=((DIS (1)+DIS (N))/2.

摘要翻译： 光记录/再现装置被布置成使得在记录或再现具有多个记录层的记录介质时，在该第一记录层上形成会聚光点时的透镜组的间隙为DIS（1） 在形成第N层（与记录介质表面最远的层）上的会聚光点时的透镜组的间隙为DIS（N），球面像差校正机构的中性点 设置在满足以下表达式的位置：透镜组间隙dst（3）=（（DIS（1）+ DIS（N））/ 2。