公开(公告)号：US07778119B2

公开(公告)日：2010-08-17

申请号：US11696533

申请日：2007-04-04

Applicant: Ryoichi Kawasaki ,  Hiroyuki Shindo

Inventor： Ryoichi Kawasaki ,  Hiroyuki Shindo

IPC: G11B7/00

CPC classification number: G11B7/0933 ,  G11B7/0903 ,  G11B7/1374 ,  G11B2007/0006

Abstract: An objective lens holding device includes a first objective lens, a second objective lens, and a lens holder, wherein an axis-to-axis distance between a central axis of the first objective lens and a central axis of the second objective lens is set to a distance, depending on a first length and a second length, which distance prevents a second edge portion from butting against a turntable when the first objective lens focuses light from a first laser on an innermost circumference of the information recording layer of an optical disc.

Abstract translation: 物镜保持装置包括第一物镜，第二物镜和透镜保持器，其中将第一物镜的中心轴与第二物镜的中心轴之间的轴线与轴之间的距离设定为 一段距离，取决于第一长度和第二长度，当第一物镜将来自第一激光的光聚焦在光盘的信息记录层的最内周上时，该距离防止第二边缘部分抵靠转台。

公开(公告)号：US20090231984A1

公开(公告)日：2009-09-17

申请号：US12404824

申请日：2009-03-16

Applicant: Tohru Hotta ,  Ryoichi Kawasaki

Inventor： Tohru Hotta ,  Ryoichi Kawasaki

IPC: G11B7/00

CPC classification number: G11B7/13927 ,  G11B7/1353 ,  G11B7/1376

Abstract: An optical pickup apparatus comprising: a laser diode; an objective lens made of a synthetic resin configured to focus laser light emitted from the laser diode to a signal recording layer of an optical disc; and a collimating lens having a diffraction grating and arranged in an optical path between the laser diode and the objective lens, the collimating lens being so moved in an optical axis direction of the laser light as to correct spherical aberration occurring in response to a change in temperature when performing a recording operation for the optical disc, and the collimating lens correcting by the diffraction grating chromatic aberration occurring when switching from the recording operation to a reproducing operation for the optical disc.

Abstract translation: 一种光学拾取装置，包括：激光二极管; 由合成树脂制成的物镜，被配置为将从激光二极管发出的激光聚焦到光盘的信号记录层; 以及具有衍射光栅并配置在激光二极管和物镜之间的光路中的准直透镜，准直透镜沿激光的光轴方向移动，以校正响应于变化而发生的球面像差 以及通过当从记录操作切换到光盘的再现操作时发生的衍射光栅色差校正的准直透镜。

公开(公告)号：US07515361B2

公开(公告)日：2009-04-07

申请号：US11681586

申请日：2007-03-02

Applicant: Ryoichi Kawasaki ,  Hiroyuki Shindo

Inventor： Ryoichi Kawasaki ,  Hiroyuki Shindo

IPC: G02B7/02

CPC classification number: G11B7/0935 ,  G11B7/1275 ,  G11B7/1374 ,  G11B2007/0006

Abstract: A lens holder is disclosed which holds a plurality of objective lenses, the lens holder holding the plurality of objective lenses so as to be arranged with a composite gravity center position of the plurality of objective lenses matching a gravity center position of the entire lens holder without the plurality of objective lenses.

Abstract translation: 公开了一种保持多个物镜的透镜保持器，透镜架保持多个物镜，以使多个物镜的复合重心位置与整个透镜保持架的重心位置相匹配，而没有 多个物镜。

公开(公告)号：US20090022038A1

公开(公告)日：2009-01-22

申请号：US12174967

申请日：2008-07-17

Applicant: Tohru Hotta ,  Ryoichi Kawasaki ,  Hiroyuki Ichikawa

Inventor： Tohru Hotta ,  Ryoichi Kawasaki ,  Hiroyuki Ichikawa

IPC: G11B7/135

CPC classification number: G11B7/004 ,  G11B7/1275 ,  G11B7/1374 ,  G11B2007/0006

Abstract: An objective lens formed of a synthetic resin material having characteristics of substantially not reducing transmittance of the objective lens when a first laser beam having a first wavelength passes through the objective lens, and reducing the transmittance according to an elapsed time to apply a second laser beam when the second laser beam having a second wavelength shorter than the first wavelength and longer than a wavelength of ultraviolet light passes through the objective lens, the objective lens being irradiated with the ultraviolet light in advance for a predetermined time such that a change in the transmittance for the second laser beam is set within a predetermined range.

Abstract translation: 一种由合成树脂材料形成的物镜，其具有当具有第一波长的第一激光束通过物镜时基本上不降低物镜的透射率的特性，并且根据经过的时间降低施加第二激光束的透射率 当具有比第一波长短且长于紫外光的波长的第二波长的第二激光束通过物镜时，物镜预先用紫外线照射预定时间，使得透射率的变化 将第二激光束设定在预定范围内。

公开(公告)号：US20080310286A1

公开(公告)日：2008-12-18

申请号：US12137312

申请日：2008-06-11

Applicant: Tohru Hotta ,  Ryoichi Kawasaki

Inventor： Tohru Hotta ,  Ryoichi Kawasaki

IPC: G11B7/00

CPC classification number: G11B7/1353 ,  G11B2007/0006

Abstract: An optical pickup apparatus comprising: an objective lens formed so that a first and second laser beams different in wavelength are respectively focused onto signal recording layers of a first and second optical discs; and a photodetector including a square-shaped light-receiving portion for being irradiated with return light, as a spot, of the first or second laser beam respectively reflected from the signal recording layers of the first or second optical discs, to generate a focus error signal, a length of a diagonal line of the light-receiving portion being substantially equal to a longer diameter of an elliptical spot formed in a direction of the diagonal line when the focus error signal is at a maximum level for an optical disc that is either one of the first and second optical discs, to which a laser beam shorter in wavelength out of the first and second laser beams is focused.

Abstract translation: 一种光学拾取装置，包括：物镜，其被形成为使得波长不同的第一和第二激光束分别聚焦在第一和第二光盘的信号记录层上; 以及光电检测器，包括用于照射分别从第一或第二光盘的信号记录层反射的第一或第二激光束的返回光的方形光接收部分，以产生聚焦误差 信号时，光接收部分的对角线的长度基本上等于当对于光盘的聚焦误差信号处于最大水平时在对角线的方向上形成的椭圆形点的较长直径， 第一和第二光盘中的一个被聚焦在第一和第二激光束之外的波长较短的激光束。

公开(公告)号：US20080074983A1

公开(公告)日：2008-03-27

申请号：US11862083

申请日：2007-09-26

Applicant: Ryoichi Kawasaki ,  Satoshi Sekiguchi

Inventor： Ryoichi Kawasaki ,  Satoshi Sekiguchi

IPC: G11B7/00

CPC classification number: G11B7/0903 ,  G11B7/1353 ,  G11B2007/0013

Abstract: An optical pickup device for reading a signal recorded in an optical disc including a first signal recording layer and a second signal recording layer, comprising: a laser diode configured to emit laser light; and a diffraction grating configured to be applied with laser light emitted from the laser diode, and to generate a main beam including zero order light, and a sub beam including plus first order light and minus first order light, such that a ratio of light amount of the sub beam to that of the main beam is substantially 1:7.

Abstract translation: 一种用于读取记录在包括第一信号记录层和第二信号记录层的光盘中的信号的光学拾取装置，包括：被配置为发射激光的激光二极管; 以及衍射光栅，被配置为施加从激光二极管发射的激光，并且产生包括零级光的主光束和包括正一级光和负一级光的子光束，使得光量比 的子光束大致为1：7。

公开(公告)号：US20070280058A1

公开(公告)日：2007-12-06

申请号：US11750711

申请日：2007-05-18

Applicant: Ryoichi Kawasaki ,  Hiroyuki Shindo

Inventor： Ryoichi Kawasaki ,  Hiroyuki Shindo

IPC: G11B7/00

CPC classification number: G11B7/22 ,  G11B7/1374 ,  G11B2007/0006

Abstract: An objective lens focusing light emitted from a light source onto an information surface of an optical disk, comprising: a first lens surface to be positioned on the light-source side; a second lens surface to be positioned on the optical-disc side; a first edge surface to be positioned on the light-source side, provided in an outer region of the first lens surface; and a second edge surface to be positioned on the optical-disc side, provided in an outer region of the second lens surface, a first optical axis of the first lens surface coinciding with a second optical axis of the second lens surface, the first optical axis and the second optical axis being orthogonal to the second edge surface.

Abstract translation: 将从光源发射的光聚焦到光盘的信息表面上的物镜，包括：位于光源侧的第一透镜表面; 位于光盘侧的第二透镜表面; 位于所述光源侧的第一边缘表面，设置在所述第一透镜表面的外部区域中; 以及设置在所述第二透镜表面的外部区域中的位于所述光盘侧的第二边缘表面，所述第一透镜表面的第一光轴与所述第二透镜表面的第二光轴重合，所述第一光学 并且所述第二光轴正交于所述第二边缘表面。

公开(公告)号：US20070263297A1

公开(公告)日：2007-11-15

申请号：US11626779

申请日：2007-01-24

Applicant: Ryoichi Kawasaki ,  Hiroyuki Shindo

Inventor： Ryoichi Kawasaki ,  Hiroyuki Shindo

IPC: G02B3/02

CPC classification number: G11B7/1374 ,  G11B7/0956 ,  G11B7/121 ,  G11B2007/0006

Abstract: An optical pickup apparatus comprising a first objective lens that focuses first laser light on an information recording layer of a first optical disc in a first mounting state where the first optical disc is mounted on a turntable; a second objective lens that focuses second laser light on an information recording layer of a second optical disc in a second mounting state where the second optical disc is mounted on the turntable, the second optical disc having an information recording format different from that of the first optical disc; and a lens holder that integrally holds the first objective lens and the second objective lens in an adjacent manner on the outside and inside, respectively, along a radial direction of the first optical disc in the first mounting state and of the second optical disc in the second mounting state, the lens holder being shiftable along the radial direction, a disc surface of the first optical disc in the first mounting state and of the second optical disc in the second mounting state being substantially parallel to a confronting face of the first objective lens and of the second objection lens, that confronts the disc surface, a minimum distance bet ween the disc surface and the confronting face in a direction of a rotation axis of the turntable being greater than a thickness of the turntable in a direction of a rotation axis thereof.

Abstract translation: 一种光拾取装置，包括：第一物镜，其在第一安装状态下将第一激光聚焦在第一光盘的信息记录层上，其中第一光盘安装在转盘上; 第二物镜，其在第二安装状态下将第二激光聚焦在第二光盘的信息记录层上，其中第二光盘安装在转盘上，第二光盘具有不同于第一光盘的信息记录格式 光盘; 以及透镜保持件，其在第一安装状态下沿着第一光盘的径向分别在外侧和内侧相邻地一体地保持第一物镜和第二物镜;以及第二光盘中的第二光盘 第二安装状态，透镜架可沿径向方向移动，处于第一安装状态的第一光盘的盘表面和处于第二安装状态的第二光盘的盘表面基本上平行于第一物镜的相对面 以及面对盘表面的第二异物透镜，在转盘的旋转轴的方向上的盘表面和面对面的最小距离大于转盘在旋转轴方向上的厚度 其中。

公开(公告)号：US5136565A

公开(公告)日：1992-08-04

申请号：US453933

申请日：1989-12-20

Applicant: Noriyoshi Ooyama ,  Chikashi Yoshinaga ,  Ryoichi Kawasaki

Inventor： Noriyoshi Ooyama ,  Chikashi Yoshinaga ,  Ryoichi Kawasaki

IPC: G11B7/09

CPC classification number: G11B7/0933 ,  G11B7/0932 ,  G11B7/0935 ,  G11B7/0946

Abstract: A yoke constituting a magnetic actuator for driving an objective lens has a plurality of arms arranged in a plane intersecting the optical axis of the lens perpendicular thereto. An optical system including the objective lens is disposed at one side of the yoke and has the outer peripheral portion of the lens positioned partly in the space between adjacent two arms. The lateral width of the device is decreased by an amount corresponding to the lap of the lens over the yoke. A cover plate is secured to the upper surface of the magnetic actuator in intimate contact with the upper end faces of the yoke arms to give enhanced rigidity to the device.

Abstract translation: 构成用于驱动物镜的磁致动器的轭具有布置在垂直于其的与透镜的光轴相交的平面中的多个臂。 包括物镜的光学系统设置在磁轭的一侧，并且透镜的外周部分部分位于相邻的两个臂之间的空间中。 装置的横向宽度减小相当于在轭架上的镜片搭接的量。 盖板固定在磁力驱动器的上表面上，与磁轭臂的上端面紧密接触，以提高装置的刚性。

公开(公告)号：US08264939B2

公开(公告)日：2012-09-11

申请号：US12945636

申请日：2010-11-12

Applicant: Tohru Hotta ,  Ryoichi Kawasaki

Inventor： Tohru Hotta ,  Ryoichi Kawasaki

IPC: G11B7/00

CPC classification number: G11B7/1392 ,  G11B7/1374

Abstract: An optical pickup apparatus includes: a laser diode configured to emit a laser beam; and an objective lens configured to condense the laser beam into a laser spot through which a signal recorded on a signal recording layer of an optical disc is read out by the laser beam, the objective lens having formed thereon a lens surface with a second numerical aperture for acting as a lens, which is larger than a first numerical aperture for forming the laser spot.

Abstract translation: 一种光学拾取装置，包括：激光二极管，被配置为发射激光束; 以及物镜，被配置为将激光束冷凝成激光光斑，通过激光束读出记录在光盘的信号记录层上的信号，物镜在其上形成有具有第二数值孔径的透镜表面 用作用作形成激光光斑的第一数值孔径的透镜。