公开(公告)号：US5111449A

公开(公告)日：1992-05-05

申请号：US522631

申请日：1990-05-11

申请人： Yukio Kurata ,  Yoshio Yoshida ,  Toshiya Nagahama

发明人： Yukio Kurata ,  Yoshio Yoshida ,  Toshiya Nagahama

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

CPC分类号： G11B7/0903 ,  G11B7/0916 ,  G11B7/123 ,  G11B7/1353 ,  G11B7/1381

摘要： An optical pick-up device for focusing a laser beam emitted from a light emitting element through an optical system onto a recording medium. The beam is reflected from the recording medium and redirected through the same optical system on to a photodetector. A tracking error signal and a focusing error signal are produced from the output signals of the photo-detector. A diffracting element positioned before the light emitting element and the photo-detector and produces two sub-spots in two directions for applying the so-called 3-spots method from the laser beams that were projected from the light emitting element toward the recording medium. The diffracting element is divided into a first sub-region and a second sub-region formed in the same place and defined by a parting line aligned substantially perpendicular to the track direction. The first sub-region includes a diffraction grating for diffracting three beams that comprise a main beam toward the recording medium. The second sub-region includes a diffraction grating for diffracting the reflected beams of the three beams from the recording medium in the direction where the photo-detecting element is installed.

公开(公告)号：US4904856A

公开(公告)日：1990-02-27

申请号：US282109

申请日：1988-12-09

申请人： Toshiya Nagahama ,  Yukio Kurata ,  Yoshio Yoshida

发明人： Toshiya Nagahama ,  Yukio Kurata ,  Yoshio Yoshida

IPC分类号： G02B7/28 ,  G11B7/09 ,  G11B7/13 ,  G11B7/135

CPC分类号： G11B7/0916 ,  G11B7/0903 ,  G11B7/133 ,  G11B7/1353 ,  G11B7/1381

摘要： An optical pickup device includes a light source, an optical lens system that converges light beams from the light source onto a recording medium, a photodetector with three divided regions that detects light beams reflected from the recording medium, and a hologram optical element that introduces the reflected light beams from the recording medium into the photodetector. The hologram optical element is divided into two regions, a part of the reflected light beams from the recording medium is diffracted by the first region of the hologram optical element and focused on a division line in the direction of the diffraction of the hologram optical element. The division line divides the photodetector into two regions, the first region and the second region. The other part of the reflected light beams is diffracted by the second region of the hologram optical element and focused on the third region of the photodetector. A difference in the output intensity between the first and second regions of the photodetector results in a focus error signal and the total of the output intensity of the first, second and third regions of the photodetector results in an information signal.

公开(公告)号：US6078707A

公开(公告)日：2000-06-20

申请号：US717355

申请日：1996-09-20

申请人： Hiroyuki Yamamoto ,  Yoshio Yoshida ,  Motohiko Yamamoto ,  Yukio Kurata

发明人： Hiroyuki Yamamoto ,  Yoshio Yoshida ,  Motohiko Yamamoto ,  Yukio Kurata

IPC分类号： G02B6/12 ,  G02B6/122 ,  G02B6/42 ,  H01L31/0232

CPC分类号： G02B6/1228 ,  G02B6/12004 ,  G02B6/42 ,  H01L31/0232 ,  G02B2006/12195

摘要： A waveguide-photodetector includes a semiconductor substrate; a waveguide section, provided on the semiconductor substrate, for propagating light; an opto-electric converting section, provided in the semiconductor substrate, for converting the light into an electric signal; and an insulative layer provided between the semiconductor substrate and the waveguide section. The waveguide section includes at least an introducing part for introducing the light to the waveguide section, a coupling part for coupling the light introduced to the waveguide section to the opto-electric converting section, and a propagating part for propagating the light from the introducing part to the coupling part. The insulative layer includes a first region for defining a position and a shape of an impurity diffused region of the opto-electric converting section, a second region which encloses the first region and is thicker than the first region, and a step portion between the first region and the second region. The introducing part, the propagating part and the coupling part of the waveguide section are located on the first region.

摘要翻译： 波导 - 光电检测器包括半导体衬底; 设置在半导体基板上的用于传播光的波导部分; 设置在半导体衬底中的用于将光转换成电信号的光电转换部; 以及设置在半导体衬底和波导部分之间的绝缘层。 波导部分至少包括用于将光引入到波导部分的引导部分，用于将引入波导部分的光耦合到光电转换部分的耦合部分和用于传播来自导入部分的光的传播部分 到耦合部分。 绝缘层包括用于限定光电转换部分的杂质扩散区域的位置和形状的第一区域，包围第一区域并且比第一区域厚的第二区域，以及第一区域 区域和第二区域。 引导部分，波导部分的传播部分和耦合部分位于第一区域上。

公开(公告)号：US5726962A

公开(公告)日：1998-03-10

申请号：US465886

申请日：1995-06-06

申请人： Kuniaki Okada ,  Kohji Minami ,  Hiroyuki Yamamoto ,  Yoshio Yoshida ,  Yukio Kurata

发明人： Kuniaki Okada ,  Kohji Minami ,  Hiroyuki Yamamoto ,  Yoshio Yoshida ,  Yukio Kurata

IPC分类号： G02B6/122 ,  G02B6/42 ,  G11B7/09 ,  G11B7/12 ,  G11B7/135 ,  G11B11/10 ,  G11B11/105 ,  G11B7/00

CPC分类号： G11B11/10543 ,  G11B7/124

摘要： The optical pickup device according to the present invention, includes: a light emitting diode for emitting a light beam; a collimating lens for collimating the light beam; an objective lens for focusing the collimated light beam from the collimating lens onto a recording medium; a beam splitter for splitting the light beam returned from the recording medium into two light beams; a servo error signal detector for receiving one of the two light beams and detecting a servo error signal; a diffracting element for diffracting the one of the two light beams from the beam splitter to direct the one of the two light beams toward the servo error signal detector; and an optical waveguide element for receiving the other one of the two light beams and detecting a magneto-optical signal, the other one of the two light beams from the beam splitter being incident upon the optical waveguide element without passing through the diffracting element, wherein the beam splitter is disposed between the collimating lens and the diffracting element.

摘要翻译： 根据本发明的光拾取装置包括：用于发射光束的发光二极管; 用于准直光束的准直透镜; 用于将来自准直透镜的准直光束聚焦到记录介质上的物镜; 用于将从记录介质返回的光束分成两束光束的分束器; 伺服误差信号检测器，用于接收两个光束中的一个并检测伺服误差信号; 衍射元件，用于将来自分束器的两个光束中的一个衍射，以将两个光束中的一个导向伺服误差信号检测器; 以及用于接收两个光束中的另一个并检测磁光信号的光波导元件，来自分束器的两个光束中的另一个光束入射到光波导元件上而不穿过衍射元件，其中 分束器设置在准直透镜和衍射元件之间。

公开(公告)号：US5652737A

公开(公告)日：1997-07-29

申请号：US561017

申请日：1995-11-21

申请人： Kohji Minami ,  Kuniaki Okada ,  Hiroyuki Yamamoto ,  Yoshio Yoshida ,  Yukio Kurata ,  Keiji Sakai

发明人： Kohji Minami ,  Kuniaki Okada ,  Hiroyuki Yamamoto ,  Yoshio Yoshida ,  Yukio Kurata ,  Keiji Sakai

IPC分类号： G02B6/122 ,  G02B6/126 ,  G02B6/28 ,  G11B7/12 ,  G11B7/135 ,  G11B11/10 ,  G11B11/105 ,  G11B11/00 ,  G02B6/26

CPC分类号： G11B7/124 ,  G02B6/1228 ,  G02B6/126 ,  G11B11/10545 ,  G02B6/2848

摘要： A mode splitter and the magneto-optical pick-up device including the mode splitter. The mode splitter includes a tapered waveguide portion whose thickness gradually becomes thin so that a light of at least one mode can be cut off. An emission position of a light wave can be varied depending on its mode. In this mode splitter, the emission position of the light wave of each mode can be adjusted by changing a thickness of the tapered waveguide, thereby improving the degree of freedom in designing the device.

摘要翻译： 模式分离器和包括模式分离器的磁光拾取装置。 模式分离器包括其厚度逐渐变薄的锥形波导部分，使得可以切断至少一种模式的光。 光波的发射位置可以根据其模式而变化。 在该模式分离器中，通过改变锥形波导管的厚度，可以调整各模式的光波的发射位置，从而提高设计的自由度。

公开(公告)号：US5428584A

公开(公告)日：1995-06-27

申请号：US97399

申请日：1993-07-23

申请人： Yoshio Yoshida ,  Hiroyuki Yamamoto ,  Renzaburou Miki ,  Kuniaki Okada ,  Yukio Kurata ,  Kouji Minami

发明人： Yoshio Yoshida ,  Hiroyuki Yamamoto ,  Renzaburou Miki ,  Kuniaki Okada ,  Yukio Kurata ,  Kouji Minami

IPC分类号： G11B7/135 ,  G11B7/12 ,  G11B7/13 ,  G11B11/10 ,  G11B11/105 ,  G11B11/00

CPC分类号： G11B11/10543 ,  G11B7/124 ,  G11B7/13

摘要： An optical information reproducing device includes a light source for generating a light beam, an optical system for converging the light beam generated by the light source on a magneto-optical recording medium on which recording information is recorded and for converging a return light beam reflected from the magneto-optical recording medium, beam splitting means for splitting the return light beam into split light beams, first detecting means for receiving one of the split light beams to detect the intensity of the one of the split light beams, servo signal generating means for generating a tracking error signal and a focusing error signal based on the output of the first detecting means, an optical waveguide disposed between the beam splitting means and the first detecting means, the optical waveguide crossing an optical axis of the one of the split light beams, an optical coupler disposed on the optical waveguide for separating part of the one of the split light beams from the one of the split beams to form a guided light beam which is guided in the optical waveguide, second detecting means for receiving the guided light beam from the optical waveguide to detect the intensity of at least one polarization component of the guided light beam, and information signal reproducing means for reproducing the recording information based on the output of the second detecting means.

摘要翻译： 一种光学信息再现装置，包括用于产生光束的光源，用于将由光源产生的光束会聚在其上记录有记录信息的磁光记录介质上并用于会聚从 磁光记录介质，用于将返回光束分成分束光束的分束装置;第一检测装置，用于接收分束光束中的一个以检测一个分束光束的强度;伺服信号产生装置， 基于所述第一检测装置的输出产生跟踪误差信号和聚焦误差信号;布置在所述分束装置和所述第一检测装置之间的光波导，所述光波导与所述一个所述分束光束 设置在所述光波导上的光耦合器，用于将所述一个所述分束光束的一部分分离 以形成在光波导中被引导的引导光束;第二检测装置，用于接收来自光波导的引导光束，以检测被引导光束的至少一个偏振分量的强度;以及信息信号 再现装置，用于基于第二检测装置的输出再现记录信息。

公开(公告)号：US6030540A

公开(公告)日：2000-02-29

申请号：US900164

申请日：1997-07-28

申请人： Hiroyuki Yamamoto ,  Yoshio Yoshida ,  Yukio Kurata

发明人： Hiroyuki Yamamoto ,  Yoshio Yoshida ,  Yukio Kurata

IPC分类号： G02B6/13 ,  G02B6/12 ,  G02B6/122 ,  G02B6/136 ,  B44C1/22 ,  G02B6/10

CPC分类号： G02B6/1228 ,  G02B6/122 ,  G02B6/136 ,  G02B2006/12173 ,  G02B2006/12176 ,  G02B2006/12195

摘要： A method for producing a tapered waveguide is produced using an undercut-type shadow mask having an overhanging part. The shadow mask includes a photoresist layer having the overhanging part and a metal layer for supporting the photoresist layer on a substrate. After the shadow mask is provided on the substrate, film-forming particles are caused to jump from above the shadow mask toward the substrate, thereby forming a dielectric film having a tapered part on the substrate. Then, the shadow mask is removed together with the film-forming particles thereon by lift-off. Then, an optical waveguide is formed on the substrate so as to cover the dielectric film having the tapered part. The thickness of the metal layer is preferably in the range of about 0.1 to 10 .mu.m and more preferably about 1 .mu.m.

摘要翻译： 使用具有突出部的底切型荫罩制造锥形波导的制造方法。 荫罩包括具有突出部分的光致抗蚀剂层和用于在衬底上支撑光致抗蚀剂层的金属层。 在基板上设置荫罩之后，使成膜颗粒从荫罩上方朝向基板跳跃，从而在基板上形成具有锥形部分的电介质膜。 然后，通过剥离将荫罩与其上的成膜颗粒一起除去。 然后，在基板上形成光波导以覆盖具有锥形部分的电介质膜。 金属层的厚度优选为约0.1〜10μm，更优选为1μm左右。

公开(公告)号：US5652816A

公开(公告)日：1997-07-29

申请号：US659327

申请日：1996-06-06

申请人： Kohji Minami ,  Kuniaki Okada ,  Hiroyuki Yamamoto ,  Yoshio Yoshida ,  Yukio Kurata

发明人： Kohji Minami ,  Kuniaki Okada ,  Hiroyuki Yamamoto ,  Yoshio Yoshida ,  Yukio Kurata

IPC分类号： G02B6/26 ,  G02B6/122 ,  G02B6/30 ,  G02B6/34 ,  G02B6/42 ,  G02B6/32

CPC分类号： G02B6/1221 ,  G02B6/34 ,  G02B6/42 ,  G02B6/4214

摘要： An optical coupler of the present invention includes: an optical waveguide including a substrate, a first dielectric layer formed on the substrate, a second dielectric layer which is formed on the first dielectric layer and has a refractive index lower than a refractive index of the first dielectric layer, and a third dielectric layer which is formed on a part of the second dielectric layer and has a refractive index equal to or lower than the refractive index of the second dielectric layer; and a light introducing portion made of a transparent material having a refractive index higher than the refractive index of each of the dielectric layers, the light introducing portion being formed on the optical waveguide and introducing converged incident light into the optical waveguide, wherein the light introducing portion is provided across a surface of the second dielectric layer and a surface of the third dielectric layer and has, as a light incident surface, a flat portion allowing the incident light introduced into the optical waveguide to pass through without eclipse.

摘要翻译： 本发明的光耦合器包括：光波导，包括基板，形成在基板上的第一介电层，第二介电层，形成在第一介电层上，折射率低于第一介电层的折射率 电介质层和形成在所述第二电介质层的一部分上并且具有等于或低于所述第二介电层的折射率的折射率的第三电介质层; 以及由折射率高于每个电介质层的折射率的透明材料制成的光引入部分，所述光引入部分形成在所述光波导上并将会聚的入射光引入所述光波导中，其中所述光引入 在第二电介质层的表面和第三电介质层的表面上设置部分，并且具有允许入射到光波导中的入射光通过而没有日食的平坦部分作为光入射表面。

公开(公告)号：US5408450A

公开(公告)日：1995-04-18

申请号：US53334

申请日：1993-04-28

申请人： Toshiya Nagahama ,  Yoshio Yoshida ,  Yukio Kurata

发明人： Toshiya Nagahama ,  Yoshio Yoshida ,  Yukio Kurata

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

CPC分类号： G11B7/1381 ,  G11B7/0903 ,  G11B7/0909 ,  G11B7/0912 ,  G11B7/13 ,  G11B7/131 ,  G11B7/1353

摘要： An optical pickup apparatus for reproducing information from an optical recording medium such as a compact disc comprising: a laser device; one or more diffraction devices; and a photodetector receiving a laser beam diffracted by the diffraction device. The surfaces of the diffraction device are provided with an antireflection coating. When the apparatus is used for the three-beam method, the two photodetecting areas in the photodetector for producing the tracking error signal are different in size and in positional relation to the laser device.

摘要翻译： 一种用于从诸如光盘的光学记录介质再现信息的光学拾取装置，包括：激光装置; 一个或多个衍射装置; 以及接受由衍射装置衍射的激光束的光电检测器。 衍射装置的表面设置有抗反射涂层。 当该装置用于三光束方法时，用于产生跟踪误差信号的光电检测器中的两个光电检测区域在尺寸上和与激光装置的位置关系上是不同的。

公开(公告)号：US07038995B2

公开(公告)日：2006-05-02

申请号：US10041068

申请日：2001-11-01

申请人： Kazuya Kitamura ,  Yukio Kurata

发明人： Kazuya Kitamura ,  Yukio Kurata

IPC分类号： G11B7/00

CPC分类号： G11B7/1353 ,  G02B9/12 ,  G02B13/0035 ,  G02B13/004 ,  G02B13/0055 ,  G02B13/006 ,  G02B13/0065 ,  G02B27/0068 ,  G11B7/1378 ,  G11B7/13927

摘要： A lightweight, highly reliable optical pickup including a singlet objective lens is offered by correcting coma aberrations which adversely affect properties of the objective lens having an increased NA. A convergent optical system is composed of a singlet objective lens with a NA of 0.75 or more and includes an aberration-correcting optical system which corrects coma aberrations due to an inclination or shift of central axes of both surfaces of the objective lens or an inclination of the objective lens or the optical storage medium to an optical axis of the optical pickup.

摘要翻译： 通过校正对具有增加的NA的物镜的性质产生不利影响的彗形像差来提供包括单重物镜的轻质，高度可靠的光学拾取器。 收敛光学系统由NA为0.75以上的单重物镜构成，包括像差校正光学系统，其校正由于物镜两面的中心轴的倾斜或偏移引起的彗形像差或倾斜度 物镜或光学存储介质到光学拾取器的光轴。