公开(公告)号：US08305868B2

公开(公告)日：2012-11-06

申请号：US12137312

申请日：2008-06-11

申请人： Tohru Hotta ,  Ryoichi Kawasaki

发明人： Tohru Hotta ,  Ryoichi Kawasaki

IPC分类号： G11B7/13

CPC分类号： G11B7/1353 ,  G11B2007/0006

摘要： 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.

摘要翻译： 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：US08203926B2

公开(公告)日：2012-06-19

申请号：US12940226

申请日：2010-11-05

申请人： Tohru Hotta ,  Ryoichi Kawasaki

发明人： Tohru Hotta ,  Ryoichi Kawasaki

IPC分类号： G11B7/00

CPC分类号： G11B7/1275 ,  G11B7/1353 ,  G11B7/1374 ,  G11B7/139 ,  G11B7/13922 ,  G11B2007/0006

摘要： An optical pickup apparatus comprises: a first laser diode that generates a first laser beam having a first wavelength; a second laser diode that generates a second laser beam having a second wavelength longer than the wavelength; a third laser diode that generates a third laser beam having a third wavelength longer than the first wavelength and shorter than the second wavelength; an objective lens having an inner, outer, intermediate regions on an incident surface, the first laser beam being condensed on a signal recording layer of a first optical disc by condensing actions of the inner and outer regions, the second laser beam being condensed on a signal recording layer of a second optical disc by condensing actions of the inner and intermediate regions, the third laser beam being condensed on a signal recording layer of a third optical disc by condensing actions of the inner and intermediate regions.

摘要翻译： 一种光学拾取装置，包括：第一激光二极管，其产生具有第一波长的第一激光束; 第二激光二极管，其产生具有比所述波长长的第二波长的第二激光束; 第三激光二极管，其产生具有比第一波长长的第三波长并且比第二波长短的第三激光束; 一种在入射表面上具有内部和外部中间区域的物镜，所述第一激光束通过所述内部和外部区域的冷凝动作在第一光盘的信号记录层上被冷凝，所述第二激光束在 信号记录层通过内部和中间区域的动作进行聚光，第三激光束通过内部和中间区域的冷凝动作在第三光盘的信号记录层上被冷凝。

公开(公告)号：US08165002B2

公开(公告)日：2012-04-24

申请号：US12729085

申请日：2010-03-22

申请人： Ryoichi Kawasaki ,  Tohru Hotta

发明人： Ryoichi Kawasaki ,  Tohru Hotta

IPC分类号： G11B7/00

CPC分类号： G11B7/1378 ,  G02B27/0025 ,  G11B7/1369 ,  G11B7/13927

摘要： An optical pickup apparatus comprising: a laser diode; an objective lens made of synthetic resin arranged in an optical path of laser light between the laser diode and an optical disc so that the laser light from the laser diode is focused onto a signal recording layer through a protection layer of the optical disc; and an aberration correction element interposed in an optical path of the laser light between the laser diode and the objective lens, the aberration correction element configured to be operated so as to correct spherical aberration caused by moisture-absorption characteristics of the objective lens.

摘要翻译： 一种光学拾取装置，包括：激光二极管; 由激光二极管和光盘之间的激光光路配置的由合成树脂制成的物镜，使得来自激光二极管的激光通过光盘的保护层聚焦在信号记录层上; 以及插入在激光二极管和物镜之间的激光的光路中的像差校正元件，所述像差校正元件被配置为操作以校正由物镜的吸湿特性引起的球面像差。

公开(公告)号：US20120026859A1

公开(公告)日：2012-02-02

申请号：US13013457

申请日：2011-01-25

申请人： Tohru Hotta ,  Ryoichi Kawasaki

发明人： Tohru Hotta ,  Ryoichi Kawasaki

IPC分类号： G11B7/135

CPC分类号： G11B7/1376 ,  G11B7/123 ,  G11B7/127 ,  G11B7/1378 ,  G11B2007/0006

摘要： An optical-pickup apparatus includes: a laser diode having a first-laser element, which emits a first-laser beam, and a second-laser element, which emits a second-laser beam having a wavelength shorter than a wavelength of the first-laser beam, arranged in the same package; an objective lens to condense the first- and second-laser beams emitted from the laser diode to signal-recording layers of first- and second-optical discs, respectively, the second-optical disc being of a standard different from a standard of the first-optical disc; and a collimating lens arranged in an optical path between the laser diode and the objective lens, the collimating lens configured to change the first- and second-laser beams from divergent light to parallel light, the collimating lens being inclined with respect to optical axes of the first- and second-laser beams so that astigmatism in the first- and second-laser beams is corrected.

摘要翻译： 一种光拾取装置包括：具有发射第一激光束的第一激光元件的激光二极管和发射具有比第一激光束的波长短的波长的第二激光束的第二激光元件， 激光束，布置在同一个包装中; 用于将从激光二极管发射的第一和第二激光束分别折射到第一和第二光盘的信号记录层的物镜，所述第二光盘是与第一和第二光盘的标准不同的标准 光盘; 以及布置在激光二极管和物镜之间的光路中的准直透镜，所述准直透镜被配置为将第一和第二激光束从发散光改变为平行光，所述准直透镜相对于 第一和第二激光束，使得第一和第二激光束中的像散被校正。

公开(公告)号：US08045428B2

公开(公告)日：2011-10-25

申请号：US12256186

申请日：2008-10-22

申请人： Tohru Hotta ,  Ryoichi Kawasaki

发明人： Tohru Hotta ,  Ryoichi Kawasaki

IPC分类号： G11B7/00

CPC分类号： G11B7/133 ,  G11B7/0901 ,  G11B7/131 ,  G11B7/1362 ,  G11B7/13922

摘要： An optical pickup apparatus comprising: an objective lens focusing laser light emitted from a laser diode to a signal recording layer of an optical disc; a photodetector including a substantially square light-receiving region made of first to fourth sensors divided by boundaries in a first direction corresponding to a tracking direction and a second direction crossing the first direction, the light-receiving region being irradiated with reflected light of the laser light which is reflected from the signal recording layer thereof; and a half mirror reflecting the laser light in a direction of the objective lens and allowing the reflected light to pass therethrough in a direction of the photodetector, the boundary in the second direction for dividing the first to fourth sensors in the light-receiving region being set according to a shape of a spot of the reflected light directly applied from the half mirror to the light-receiving region.

摘要翻译： 一种光学拾取装置，包括：将从激光二极管发射的激光聚焦到光盘的信号记录层的物镜; 光电检测器，其包括由对应于跟踪方向的第一方向上的边界划分的第一至第四传感器和与第一方向相交的第二方向的第一至第四传感器所构成的基本正方形的光接收区域，受光区域被激光的反射光照射 从其信号记录层反射的光; 以及半反射镜，其在物镜的方向上反射激光，并允许反射光沿着光电检测器的方向通过，在光接收区域中的第一至第四传感器的第二方向上的边界是 根据从半反射镜直接施加到光接收区域的反射光的光斑的形状来设定。

公开(公告)号：US20110249545A1

公开(公告)日：2011-10-13

申请号：US12897647

申请日：2010-10-04

申请人： Tohru Hotta ,  Ryoichi Kawasaki

发明人： Tohru Hotta ,  Ryoichi Kawasaki

IPC分类号： G11B7/135 ,  G02B5/18

CPC分类号： G02B5/1866 ,  G02B5/188 ,  G11B7/1353 ,  G11B7/1374 ,  G11B7/13922 ,  G11B2007/0006

摘要： An objective lens includes: a diffraction area having a diffraction structure provided thereon concentrically around an optical axis of the objective lens; and a first non-diffraction area provided outward an outer circumference of the diffraction area, the objective lens being configured to focus first laser light on a signal recording surface of a first optical recording medium by refraction in the first non-diffraction area; focus second laser light, different in wavelength from the first laser light, on a signal recording surface of a second optical recording medium by diffraction in the diffraction area; and focus third laser light, different in wavelength from the first laser light and the second laser light, on a signal recording surface of a third optical recording medium by diffraction in the diffraction area.

摘要翻译： 物镜包括：衍射区域，其衍射结构在物镜的光轴周围同心地设置; 以及在所述衍射区域的外周向外设置的第一非衍射区域，所述物镜被配置为通过在所述第一非衍射区域中的折射将所述第一激光聚焦在所述第一光学记录介质的信号记录表面上; 将第二激光的波长与第一激光不同的第二激光聚焦在第二光记录介质的信号记录表面上，通过衍射区域的衍射; 并且通过衍射区域中的衍射，将第一激光和第二激光的波长不同的第三激光聚焦在第三光记录介质的信号记录表面上。

公开(公告)号：US20110209164A1

公开(公告)日：2011-08-25

申请号：US12859123

申请日：2010-08-18

申请人： Ryoichi Kawasaki ,  Tohru Hotta

发明人： Ryoichi Kawasaki ,  Tohru Hotta

IPC分类号： G11B7/09 ,  B23P11/00

CPC分类号： G11B7/22 ,  G11B7/1374 ,  G11B7/13925 ,  G11B2007/0006 ,  Y10T29/49826

摘要： An optical-pickup apparatus includes: a first-objective lens; a second-objective lens; a lens holder including a first-lens barrel having the first-objective lens mounted on an end face thereof and a second-lens barrel having the second-objective lens mounted on an end face thereof; an actuator unit having the lens holder mounted thereon; and a housing having the actuator unit mounted thereon, the first and second objective lenses each being mounted on the lens holder such that a direction, in which wavefront of coma aberration on each lens face is most advanced in phase, is aligned with a radial direction of an information-recording medium, the actuator unit being mounted on the housing such that an optical axis of the first-objective lens is inclined in the radial direction at an inclination angle of the axis toward a recording surface of the medium required to cancel coma aberration of the first-objective lens to the surface.

摘要翻译： 一种光拾取装置，包括：第一物镜; 第二物镜; 透镜保持器，其包括具有安装在其端面上的第一物镜的第一透镜镜筒和安装在其端面上的具有第二物镜的第二透镜镜筒; 具有安装在其上的透镜保持器的致动器单元; 以及具有安装在其上的致动器单元的壳体，所述第一和第二物镜各自安装在所述透镜保持器上，使得每个透镜面上的彗差的波前相位最前进的方向与径向对齐 所述致动器单元安装在所述壳体上，使得所述第一物镜的光轴在径向方向上以朝向所述介质的记录表面的倾斜角倾斜以消除彗差所需的介质 第一物镜对表面的像差。

公开(公告)号：US20110116354A1

公开(公告)日：2011-05-19

申请号：US12945636

申请日：2010-11-12

申请人： Tohru Hotta ,  Ryoichi Kawasaki

发明人： Tohru Hotta ,  Ryoichi Kawasaki

IPC分类号： G11B7/00

CPC分类号： G11B7/1392 ,  G11B7/1374

摘要： 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.

摘要翻译： 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。

公开(公告)号：US07898910B2

公开(公告)日：2011-03-01

申请号：US12147564

申请日：2008-06-27

申请人： Tohru Hotta ,  Ryoichi Kawasaki

发明人： Tohru Hotta ,  Ryoichi Kawasaki

IPC分类号： G11B7/00

CPC分类号： G11B7/1356 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/127 ,  G11B7/1362 ,  G11B7/1374 ,  G11B7/139 ,  G11B2007/0006

摘要： An optical pickup apparatus comprising: a first objective lens; and a second objective lens arranged with the first objective lens in a radial direction of an optical disc, the first objective lens being configured to focus laser light for reproduction, which is laser light for reproducing a signal recorded in a signal recording layer of the optical disc, onto the signal recording layer, the second objective lens being configured to focus laser light for recording, which is laser light for recording a signal, onto the signal recording layer.

摘要翻译： 一种光学拾取装置，包括：第一物镜; 以及与所述第一物镜配置在光盘的径向方向上的第二物镜，所述第一物镜被配置为聚焦用于再现的激光，所述激光用于再现记录在所述光学信号记录层中的信号 光盘到信号记录层上，第二物镜被配置为将用于记录信号的激光用于记录的激光聚焦到信号记录层上。

公开(公告)号：US20090201791A1

公开(公告)日：2009-08-13

申请号：US12395184

申请日：2009-02-27

申请人： Tohru Hotta ,  Ryoichi Kawasaki

发明人： Tohru Hotta ,  Ryoichi Kawasaki

IPC分类号： G11B7/00

CPC分类号： G11B7/22 ,  G11B7/1356

摘要： An optical-pickup apparatus comprising: a polarization beam splitter fixed to a base, which includes a first prism that laser light emitted from a laser diode enters, a second prism that return light of the laser light reflected from a signal recording layer of an optical disc enters, and a control film that is formed on either one of opposed surfaces of the first and second prisms so that the laser light and the return light are selectively passed through or reflected from the control film, the opposed surfaces being opposed to each other; and first and second positioning pins provided on the base to position the polarization beam splitter, the polarization beam splitter being fixed to the base in a state where the opposed surface of at least one of the first and second prisms is made in contact with at least one of the first and second positioning pins.

摘要翻译： 一种光拾取装置，包括：固定到基座的偏振分束器，其包括从激光二极管射出的激光进入的第一棱镜，将从光学信号记录层反射的激光的光返回的第二棱镜 光盘进入，并且形成在第一和第二棱镜的相对表面中的任一个上的控制膜，使得激光和返回光选择性地通过或从控制膜反射，相对的表面彼此相对 ; 以及设置在基座上以定位偏振分束器的第一和第二定位销，所述偏振分束器在至少一个第一和第二棱镜的相对表面至少与至少接触的状态下固定到基座 第一和第二定位销之一。