公开(公告)号：US5761174A

公开(公告)日：1998-06-02

申请号：US523147

申请日：1995-09-05

申请人： Tadashi Takeda ,  Yoshio Hayashi ,  Ikuo Kasuga ,  Kazuo Higashiura ,  Noriyuki Satoh ,  Hisahiro Ishihara

发明人： Tadashi Takeda ,  Yoshio Hayashi ,  Ikuo Kasuga ,  Kazuo Higashiura ,  Noriyuki Satoh ,  Hisahiro Ishihara

IPC分类号： G11B7/09 ,  G11B7/135

CPC分类号： G11B7/0916 ,  G11B7/0903 ,  G11B7/0908 ,  G11B7/1353 ,  G11B7/1381

摘要： An optical pickup device includes a light source irradiating a record medium with plural light spots of light emitted therefrom, a plurality of light detecting elelments to which reflected light of the light spots are guided, respectively, to adequately synthesize and compare outputs of said light detecting elements, thereby reading information recorded in tracks of the record medium, and detecting an tracking error and a focusing error, and a hologram element which splits light emitted from the light source into plural beams is disposed in an optical path between the light source and the record medium, said hologram element is split by a split line, said split line elongating in a direction perpendicular to a track of the medium on an optical axis, and a hologram pattern having a diffraction function which is substantially directed in the track direction is disposed on at least one side of said split line, thereby differentiating diffraction conditions on both sides of said split line from each other.

摘要翻译： 一种光学拾取装置包括：一个光源，用于照射具有从其发出的光的多个光点的记录介质，分别引导光点的反射光的多个光检测元件，以充分合成并比较所述光检测的输出 从而读取记录在记录介质的轨道中的信息，并且检测跟踪误差和聚焦误差，并且将从光源发射的光分解成多个光束的全息元件设置在光源和光源之间的光路中 记录介质，所述全息元件被分割线分开，所述分割线在垂直于光轴上的介质的轨道的方向上延伸，并且设置具有基本上指向轨道方向的衍射函数的全息图图案 在所述分割线的至少一侧上，从而使所述分割线的两侧的衍射条件有差异 从彼此。

公开(公告)号：US06577564B2

公开(公告)日：2003-06-10

申请号：US10194301

申请日：2002-07-15

申请人： Tadashi Takeda ,  Hisahiro Ishihara ,  Yoshio Hayashi ,  Taminori Masuzawa ,  Yuichi Takei

发明人： Tadashi Takeda ,  Hisahiro Ishihara ,  Yoshio Hayashi ,  Taminori Masuzawa ,  Yuichi Takei

IPC分类号： G11B7125

CPC分类号： G11B7/123 ,  G11B7/22

摘要： An optical pickup device includes a semiconductor laser for emitting forward and backward laser light from front and back emergent end faces thereof, focusing device for focusing the forward laser light emergent from the front emergent end face of said semiconductor laser onto an optical recording medium, a light-receiving element for signal reproduction for detecting return light from the optical recording medium, and a light-guiding system for guiding the return light to said light-receiving element for signal reproduction, said optical pickup device being provided with a light source unit having an arrangement in which said semiconductor laser and said light-receiving element for signal reproduction being incorporated in a common package and shielding device, disposed inside said package of said light source unit, for preventing the light emitted from said semiconductor laser from being incident upon said light-receiving element for signal reproduction.

公开(公告)号：US06445671B1

公开(公告)日：2002-09-03

申请号：US09343267

申请日：1999-06-30

申请人： Tadashi Takeda ,  Hisahiro Ishihara ,  Yoshio Hayashi ,  Taminori Masuzawa ,  Yuichi Takei

发明人： Tadashi Takeda ,  Hisahiro Ishihara ,  Yoshio Hayashi ,  Taminori Masuzawa ,  Yuichi Takei

IPC分类号： G11B7125

CPC分类号： G11B7/123 ,  G11B7/22

摘要： An optical pickup device includes a semiconductor laser for emitting forward and backward laser light from front and back emergent end faces thereof, focusing device for focusing the forward laser light emergent from the front emergent end face of said semiconductor laser onto an optical recording medium, a light-receiving element for signal reproduction for detecting return light from the optical recording medium, and a light-guiding system for guiding the return light to said light-receiving element for signal reproduction, said optical pickup device being provided with a light source unit having an arrangement in which said semiconductor laser and said light-receiving element for signal reproduction being incorporated in a common package and shielding device, disposed inside said package of said light source unit, for preventing the light emitted from said semiconductor laser from being incident upon said light-receiving element for signal reproduction.

摘要翻译： 光拾取装置包括：半导体激光器，用于从前后出射端面发射前后激光;聚焦装置，用于将从所述半导体激光器的前端面出射的正向激光聚焦到光记录介质上;聚焦装置， 用于信号再现的光接收元件，用于检测来自光记录介质的返回光;以及光引导系统，用于将返回光引导到所述光接收元件进行信号再现，所述光学拾取装置设置有光源单元，该光源单元具有 其中所述半导体激光器和用于信号再现的所述光接收元件被结合在设置在所述光源单元的所述封装内的公共封装和屏蔽装置中，用于防止从所述半导体激光器发射的光入射到所述光源单元 用于信号再现的光接收元件。

公开(公告)号：US06184512B2

公开(公告)日：2001-02-06

申请号：US09082385

申请日：1998-05-20

申请人： Kazuo Higashiura ,  Yoshio Hayashi ,  Tadashi Takeda

发明人： Kazuo Higashiura ,  Yoshio Hayashi ,  Tadashi Takeda

IPC分类号： G01J120

CPC分类号： G01J1/04 ,  G01J1/0407 ,  G01J1/0437 ,  G01J1/0477 ,  G01J1/4228 ,  G01J1/4257

摘要： A semiconductor laser apparatus comprises a semiconductor substrate, a semiconductor laser which is fixed on the semiconductor substrate and a prism having a slanted plane. The prism is placed such that its slanted plane faces a side across from the semiconductor laser. The apparatus also includes an optical detector for monitoring which is formed on the surface of the semiconductor substrate. The surface is covered by the prism. The following are formed on the slanted plane of the prism: a reflection region on which the surface is processed for reflecting a part of an emitted light beam from the semiconductor laser and a transmissive refraction region on which the surface is processed such that the remaining part of the emitted light beam is transmitted and refracted to be guided to a light receiving plane of the optical detector for monitoring.

摘要翻译： 半导体激光装置包括半导体衬底，固定在半导体衬底上的半导体激光器和具有倾斜平面的棱镜。 棱镜被放置成使得其倾斜平面面对半导体激光器的一侧。 该装置还包括形成在半导体衬底的表面上的用于监视的光学检测器。 表面被棱镜覆盖。 在棱镜的倾斜平面上形成以下反射区域：表面被处理以反射来自半导体激光器的发射光束的一部分的反射区域和表面被处理的透射折射区域，使得剩余部分 的发射光束被透射和折射以被引导到用于监测的光学检测器的光接收面。

公开(公告)号：US6151288A

公开(公告)日：2000-11-21

申请号：US115212

申请日：1998-07-14

申请人： Yuichi Takei ,  Tadashi Takeda ,  Yoshio Hayashi

发明人： Yuichi Takei ,  Tadashi Takeda ,  Yoshio Hayashi

IPC分类号： G11B7/12 ,  G11B7/135 ,  G11B7/22

CPC分类号： G11B7/1353 ,  G11B7/12 ,  G11B7/22

摘要： An optical head assembly comprises a laser light source, an objective lens for converging a laser light emitted from the laser light source on an optical recording medium, an optical detector for detecting a returning light from the optical recording medium, a diffraction unit mounted in an optical path between the laser light source and objective lens for positioning multiple diffraction grating means, a base of the optical head assembly for supporting the objective lens, the laser light source and the optical detector, and a diffraction grating unit retaining portion formed on the base for holding the diffraction grating unit.

摘要翻译： 光学头组件包括激光源，用于将从激光源发射的激光会聚在光学记录介质上的物镜，用于检测来自光学记录介质的返回光的光学检测器，安装在 用于定位多个衍射光栅装置的激光源和物镜之间的光路，用于支撑物镜的光学头组件的基座，激光光源和光学检测器以及形成在基底上的衍射光栅单元保持部分 用于保持衍射光栅单元。

公开(公告)号：US5828643A

公开(公告)日：1998-10-27

申请号：US665764

申请日：1996-06-19

申请人： Tadashi Takeda ,  Yoshio Hayashi ,  Hideo Takezoe ,  Ken Ishikawa

发明人： Tadashi Takeda ,  Yoshio Hayashi ,  Hideo Takezoe ,  Ken Ishikawa

IPC分类号： G11B7/09 ,  G11B7/12 ,  G11B7/13 ,  G11B7/135 ,  G11B7/00

CPC分类号： G11B7/131 ,  G11B7/0903 ,  G11B7/0908 ,  G11B7/0916 ,  G11B7/123 ,  G11B7/1353 ,  G11B7/0943

摘要： An optical pickup head apparatus for reading information signals from a recording medium having a laser beam light source, an objective lens and a photodetector, the improvement comprises a holographic optical element constructed of a pair of diffraction gratings having different diffractive conditions wherein the element is split into two by a split line near its optical axis as a border and a diffraction generation prevention device for preventing the generation of unwanted diffracted beams from a recording medium. The optical pickup head apparatus irradiates a laser beam emitted from the light source onto a recording medium via the holographic optical element and the objective lens. Beams reflected from the recording medium are guided to the photodetector via the objective lens and the holographic optical element.

公开(公告)号：US5739952A

公开(公告)日：1998-04-14

申请号：US421904

申请日：1995-04-14

申请人： Tadashi Takeda ,  Yoshio Hayashi ,  Hideo Takezoe ,  Ken Ishikawa

发明人： Tadashi Takeda ,  Yoshio Hayashi ,  Hideo Takezoe ,  Ken Ishikawa

IPC分类号： G02B27/28 ,  G11B7/135 ,  G11B11/105 ,  G02B5/18

CPC分类号： G11B7/1353 ,  G02B27/283 ,  G11B11/10543

摘要： A polarizing beam splitter includes: an optically isotropic substrate; a layer of birefringent material formed on top of said optically isotropic substrate; and a periodic pattern of ridges and grooves formed on a surface of said optically isotropic substrate to make a grating; and a refractive index equal to either the refractive index of the birefringent material for ordinary light or the index for extraordinary light, said grooves being filled with the material.

摘要翻译： 偏振分束器包括：光学各向同性基板; 在所述光学各向同性基底的顶部上形成一层双折射材料; 以及形成在所述光学各向同性基底的表面上以形成光栅的脊和凹槽的周期性图案; 以及相当于用于普通光的双折射材料的折射率或特殊光的折射率的折射率，所述槽被材料填充。

公开(公告)号：US6016300A

公开(公告)日：2000-01-18

申请号：US114602

申请日：1998-07-13

申请人： Tadashi Takeda ,  Yoshio Hayashi ,  Hideo Takezoe ,  Ken Ishikawa

发明人： Tadashi Takeda ,  Yoshio Hayashi ,  Hideo Takezoe ,  Ken Ishikawa

IPC分类号： G11B7/09 ,  G11B7/12 ,  G11B7/13 ,  G11B7/135 ,  G11B7/00

CPC分类号： G11B7/131 ,  G11B7/0903 ,  G11B7/0908 ,  G11B7/0916 ,  G11B7/123 ,  G11B7/1353 ,  G11B7/0943

摘要： An optical pickup head apparatus for reading information signals from a recording medium having a laser beam light source, an objective lens and a photodetector, the improvement comprises a holographic optical element constructed of a pair of diffraction gratings having different diffractive conditions wherein the element is split into two by a split line near its optical axis as a border and a diffraction generation prevention device for preventing the generation of unwanted diffracted beams from a recording medium. The optical pickup head apparatus irradiates a laser beam emitted from the light source onto a recording medium via the holographic optical element and the objective lens. Beams reflected from the recording medium are guided to the photodetector via the objective lens and the holographic optical element.

摘要翻译： 一种用于从具有激光束光源，物镜和光电检测器的记录介质读取信息信号的光学拾取头装置，其改进包括由具有不同衍射条件的一对衍射光栅构成的全息光学元件，其中元件被分裂 通过其光轴附近的分割线作为边界分成两条，以及用于防止从记录介质产生不需要的衍射光束的衍射产生防止装置。 光拾取头设备经由全息光学元件和物镜将从光源发射的激光束照射到记录介质上。 从记录介质反射的光束经由物镜和全息光学元件引导到光检测器。

公开(公告)号：US5648950A

公开(公告)日：1997-07-15

申请号：US548133

申请日：1995-10-25

申请人： Tadashi Takeda ,  Yoshio Hayashi

发明人： Tadashi Takeda ,  Yoshio Hayashi

IPC分类号： G11B7/09 ,  G11B7/13 ,  G11B7/135 ,  G11B11/105 ,  G11B11/10

CPC分类号： G11B7/131 ,  G11B11/10543 ,  G11B7/0943 ,  G11B7/1353 ,  G11B7/1356 ,  G11B11/10576 ,  G11B7/0901 ,  G11B7/0908

摘要： In an optical pickup system, the light emitted from a source to illuminate an optical recording medium is reflected and directed via a beam splitter to a photodetector so as to read information signals, and a hologram device for splitting the emerging light from the source into a plurality of beams is provided as an integral part of the entrance surface of the beam splitter.

摘要翻译： 在光学拾取系统中，从光源发出的光照射光记录介质的光经由分束器被反射并定向到光电检测器以便读取信息信号，以及全息装置，用于将来自光源的出射光分成 多个光束作为分束器的入射面的整体部分被提供。

公开(公告)号：US06552317B1

公开(公告)日：2003-04-22

申请号：US09592812

申请日：2000-06-13

申请人： Tadashi Takeda ,  Yuichi Takei ,  Yoshio Hayashi

发明人： Tadashi Takeda ,  Yuichi Takei ,  Yoshio Hayashi

IPC分类号： G02B704

CPC分类号： G11B7/1381 ,  G11B7/123 ,  G11B7/1353 ,  G11B7/1365

摘要： A phase difference plate (12) converts states of polarization of emergent light form a laser light source (13) and return light form an optical recording medium (5). A diffractive element (21) separates the return light from an optical axis leading from the laser light source (13) to the optical recording medium (5), and guides the return light to a photodetector (14) on the basis of a difference between the states of polarization of the emergent light and the return light. The polarization direction of emergent light from the laser light source (13) is arranged so as to be oriented in the radial direction of the optical recording medium (5) (in the direction of birefringence of the optical recording medium). The azimuth and the amount of phase of the phase difference plate (12) are set so that a peak of a signal in tensity detected by the photodetector (14) appears while an amount of birefringence of the optical recording medium changes from 0 to a quarter wavelength of the laser light when the amount of birefringence of the optical recording medium (5) is changed.

摘要翻译： 相位差板（12）将形成激光光源（13）的出射光的偏振态转换成光记录介质（5）。 衍射元件（21）将来自激光光源（13）的光轴的返回光分离到光学记录介质（5），并且基于第二光学元件之间的差异将返回光引导到光电检测器（14） 出射光和返回光的极化状态。 来自激光光源（13）的出射光的偏振方向被布置成沿着光学记录介质（5）的径向（沿着光学记录介质的双折射方向）定向。 相位差板（12）的方位角和相位量被设定为使光电检测器（14）检测到的张力信号的峰值出现，同时光记录介质的双折射量从0变化到1/4 当光学记录介质（5）的双折射量改变时，激光的波长。