公开(公告)号：US08259553B2

公开(公告)日：2012-09-04

申请号：US12703294

申请日：2010-02-10

申请人： Fumiaki Nakano ,  Nobuhiko Ando ,  Noriaki Nishi ,  Takashi Nakao ,  Hiroaki Nakagawa ,  Yutaka Tentaku

发明人： Fumiaki Nakano ,  Nobuhiko Ando ,  Noriaki Nishi ,  Takashi Nakao ,  Hiroaki Nakagawa ,  Yutaka Tentaku

IPC分类号： G11B7/135

CPC分类号： G11B7/1353 ,  G11B7/0903 ,  G11B7/131 ,  G11B2007/0013

摘要： An optical pickup includes: a light source outputting a light beam; an objective lens collecting the light beam on a target recording layer as a target of plural recording layers provided in an optical disc; a lens moving unit moving the objective lens in a tracking direction nearly orthogonal to track grooves helically or coaxially formed in the target recording layer; a collective lens collecting a reflected light beam formed when the light beam is reflected by the optical disc; a diffraction optical element diffracting part of the reflected first-order light beam in predetermined directions as first, second, third and fourth beams; and a photodetector receiving the first and second beams using first and second light receiving areas, and generating light reception signals, and receiving the third and fourth beams using third and fourth light receiving areas, and generates light reception signals.

摘要翻译： 光拾取器包括：输出光束的光源; 将目标记录层上的光束收集成设置在光盘中的多个记录层的目标物的物镜; 透镜移动单元，沿跟踪方向移动所述物镜，所述跟踪方向与所述目标记录层中螺旋或同轴地形成的轨道槽几乎正交; 收集当光束被光盘反射时形成的反射光束的集体透镜; 衍射光学元件将预定方向的反射一次光束的一部分衍射为第一，第二，第三和第四光束; 以及光电检测器，其使用第一和第二光接收区域接收第一和第二光束，并且产生光接收信号，并且使用第三和第四光接收区域接收第三和第四光束，并且产生光接收信号。

公开(公告)号：US08000189B2

公开(公告)日：2011-08-16

申请号：US12501834

申请日：2009-07-13

申请人： Takashi Nakao ,  Fumiaki Nakano ,  Noriaki Nishi ,  Nobuhiko Ando ,  Hiroaki Nakagawa ,  Yutaka Tentaku

发明人： Takashi Nakao ,  Fumiaki Nakano ,  Noriaki Nishi ,  Nobuhiko Ando ,  Hiroaki Nakagawa ,  Yutaka Tentaku

IPC分类号： G11B7/00

CPC分类号： G11B7/1381 ,  G11B7/0903 ,  G11B7/131 ,  G11B7/1353 ,  G11B2007/0006 ,  G11B2007/0013

摘要： An optical pickup includes: a light source that emits a light beam; an object lens that condenses the light beam on a target recording layer of an optical disk; a lens moving unit; a condensing lens; a hologram element that diffracts, in diffracting a reflected light beam and separating it into reflected zeroth-order and first-order light beams, parts of the reflected first-order light beam in a first direction and sets them as first and second beams, diffracts parts of the reflected first-order light beam in a second direction and sets them as third and fourth beams; and a photodetector that receives the first and second beams and the third and fourth beams and generates light reception signals, and receives interlayer stray light of a part of the light beam reflected by the other recording layers other than the target recording layer and generates a stray light reception signal.

摘要翻译： 光拾取器包括：发射光束的光源; 将光束聚光在光盘的目标记录层上的物镜; 透镜移动单元; 聚光透镜; 衍射衍射反射光束并将其分离成反射的零级和一级光束的全息元件，将反射的一级光束的第一方向的部分设置为第一和第二光束，衍射 反射的一级光束的一部分在第二方向上并将其设置为第三和第四光束; 以及光电检测器，其接收第一和第二光束以及第三和第四光束并产生光接收信号，并且接收由目标记录层以外的其它记录层反射的部分光束的层间杂散光，并产生杂散 光接收信号。

公开(公告)号：US20100214902A1

公开(公告)日：2010-08-26

申请号：US12703294

申请日：2010-02-10

申请人： Fumiaki Nakano ,  Nobuhiko Ando ,  Noriaki Nishi ,  Takashi Nakao ,  Hiroaki Nakagawa ,  Yutaka Tentaku

发明人： Fumiaki Nakano ,  Nobuhiko Ando ,  Noriaki Nishi ,  Takashi Nakao ,  Hiroaki Nakagawa ,  Yutaka Tentaku

IPC分类号： G11B7/135

CPC分类号： G11B7/1353 ,  G11B7/0903 ,  G11B7/131 ,  G11B2007/0013

摘要： An optical pickup includes: a light source outputting a light beam; an objective lens collecting the light beam on a target recording layer as a target of plural recording layers provided in an optical disc; a lens moving unit moving the objective lens in a tracking direction nearly orthogonal to track grooves helically or coaxially formed in the target recording layer; a collective lens collecting a reflected light beam formed when the light beam is reflected by the optical disc; a diffraction optical element diffracting part of the reflected first-order light beam in predetermined directions as first, second, third and fourth beams; and a photodetector receiving the first and second beams using first and second light receiving areas, and generating light reception signals, and receiving the third and fourth beams using third and fourth light receiving areas, and generates light reception signals.

摘要翻译： 光拾取器包括：输出光束的光源; 将目标记录层上的光束收集成设置在光盘中的多个记录层的目标物的物镜; 透镜移动单元，沿跟踪方向移动所述物镜，所述跟踪方向与所述目标记录层中螺旋或同轴地形成的轨道槽几乎正交; 收集当光束被光盘反射时形成的反射光束的集体透镜; 衍射光学元件将预定方向的反射一次光束的一部分衍射为第一，第二，第三和第四光束; 以及光电检测器，其使用第一和第二光接收区域接收第一和第二光束，并且产生光接收信号，并且使用第三和第四光接收区域接收第三和第四光束，并且产生光接收信号。

公开(公告)号：US20100014410A1

公开(公告)日：2010-01-21

申请号：US12501834

申请日：2009-07-13

申请人： Takashi NAKAO ,  Fumiaki NAKANO ,  Noriaki NISHI ,  Nobuhiko ANDO ,  Hiroaki NAKAGAWA ,  Yutaka TENTAKU

发明人： Takashi NAKAO ,  Fumiaki NAKANO ,  Noriaki NISHI ,  Nobuhiko ANDO ,  Hiroaki NAKAGAWA ,  Yutaka TENTAKU

IPC分类号： G11B7/00

CPC分类号： G11B7/1381 ,  G11B7/0903 ,  G11B7/131 ,  G11B7/1353 ,  G11B2007/0006 ,  G11B2007/0013

摘要： An optical pickup includes: a light source that emits a light beam; an object lens that condenses the light beam on a target recording layer of an optical disk; a lens moving unit; a condensing lens; a hologram element that diffracts, in diffracting a reflected light beam and separating it into reflected zeroth-order and first-order light beams, parts of the reflected first-order light beam in a first direction and sets them as first and second beams, diffracts parts of the reflected first-order light beam in a second direction and sets them as third and fourth beams; and a photodetector that receives the first and second beams and the third and fourth beams and generates light reception signals, and receives interlayer stray light of a part of the light beam reflected by the other recording layers other than the target recording layer and generates a stray light reception signal.

摘要翻译： 光拾取器包括：发射光束的光源; 将光束聚光在光盘的目标记录层上的物镜; 透镜移动单元; 聚光透镜; 衍射衍射反射光束并将其分离成反射的零级和一级光束的全息元件，将反射的一级光束的第一方向的部分设置为第一和第二光束，衍射 反射的一级光束的一部分在第二方向上并将其设置为第三和第四光束; 以及光电检测器，其接收第一和第二光束以及第三和第四光束并产生光接收信号，并且接收由目标记录层以外的其它记录层反射的部分光束的层间杂散光，并产生杂散 光接收信号。