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：USRE35332E

公开(公告)日：1996-09-24

申请号：US123459

申请日：1993-09-17

申请人： Toshiya Nagahama ,  Yoshio Yoshida ,  Yasuo Nakata ,  Yukio Kurata

发明人： Toshiya Nagahama ,  Yoshio Yoshida ,  Yasuo Nakata ,  Yukio Kurata

IPC分类号： G11B7/09 ,  G11B7/135 ,  G01J1/20 ,  G11B7/00

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

摘要： An optical pickup device in which a main beam and a pair of sub-beams are used and a diffraction device is disposed between a recording medium and a light receiving device such as a photodetector is disclosed. The diffraction device comprises first to third diffraction regions. The second and third regions receive light beams from the recording medium which are substantially identical in amount to each other. The light receiving device comprises a first to a fourth light receiving regions. The first and second light receiving regions are juxtaposed, and separated by a line. The main beam which has been diffracted by the first diffraction region is focused onto said line. The main beam which has been diffracted by the second diffraction region is focused onto the first light receiving region. The main beam which has been diffracted by the third diffracting region is focused onto the second light receiving region. The sub-beams which have been diffracted by the diffraction device are focused onto the third and fourth light receiving regions, respectively. Alternatively, the diffraction device comprises an area where one or more diffraction regions are formed. The farthest point of the area at the side of the light receiving device is separated from the optical axis by a predetermined distance, to prevent the first order diffracted beam from entering the optical system disposed between the diffraction device and a recording medium.

摘要翻译： 公开了一种其中使用主光束和一对子光束并且在记录介质和诸如光电检测器的光接收装置之间设置衍射装置的光学拾取装置。 衍射装置包括第一至第三衍射区域。 第二和第三区域接收来自记录介质的光束彼此基本相同。 光接收装置包括第一至第四光接收区域。 第一和第二光接收区域并列并且被一行分开。 已经被第一衍射区衍射的主光束被聚焦到所述线上。 已经被第二衍射区域衍射的主光束被聚焦到第一光接收区域上。 已经被第三衍射区域衍射的主光束被聚焦到第二光接收区域上。 已经被衍射装置衍射的子光束分别聚焦在第三和第四光接收区上。 或者，衍射装置包括形成一个或多个衍射区域的区域。 光接收装置一侧的区域的最远点与光轴分开预定距离，以防止一级衍射光束进入设置在衍射装置和记录介质之间的光学系统。

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：US5049732A

公开(公告)日：1991-09-17

申请号：US424373

申请日：1989-10-19

申请人： Toshiya Nagahama ,  Yoshio Yoshida ,  Yasuo Nakata ,  Yukio Kurata

发明人： Toshiya Nagahama ,  Yoshio Yoshida ,  Yasuo Nakata ,  Yukio Kurata

IPC分类号： G11B7/09 ,  G11B7/135

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

摘要： An optical pickup device in which a main beam and a pair of sub-beams are used and a diffraction device is disposed between a recording medium and a light receiving device such as a photodetector is disclosed. The diffraction device comprises first to third diffraction regions. The second and third regions receive light beams from the recording medium which are substantially identical in amount to each other. The light receiving device comprises a first to a fourth light receiving regions. The first and second light receiving regions are juxtaposed, and separated by a line. The main beam which has been diffracted by the first diffraction region is focused onto said line. The main beam which has been diffracted by the second diffraction region is focused onto the first light receiving region. The main beam which has been diffracted by the third diffracting region is focused onto the second light receiving region. The sub-beams which have been diffracted by the diffraction device are focused onto the third and fourth light receiving regions, respectively. Alternatively, the diffraction device comprises an area where one or more diffraction regions are formed. The farthest point of the area at the side of the light receiving device is separated from the optical axis by a predetermined distance, to prevent the first order diffracted beam from entering the optical system disposed between the diffraction device and a recording medium.

公开(公告)号：US5465315A

公开(公告)日：1995-11-07

申请号：US986052

申请日：1992-12-02

申请人： Keiji Sakai ,  Yoshio Yoshida ,  Hiroyuki Yamamoto ,  Yukio Kurata ,  Yasuo Nakata ,  Takahiro Miyake

发明人： Keiji Sakai ,  Yoshio Yoshida ,  Hiroyuki Yamamoto ,  Yukio Kurata ,  Yasuo Nakata ,  Takahiro Miyake

IPC分类号： G02B6/06 ,  G02F1/1333 ,  G09F9/305 ,  G02B6/08

CPC分类号： G02F1/13336 ,  G02B6/06 ,  G09F9/305 ,  Y10S385/901

摘要： A display apparatus of the invention includes: a plurality of display devices arranged in one direction, each of the plurality of display devices having a display area; and a plurality of image transmission means corresponding to the respective display devices, one end face of each of the image transmission means being coupled to a display area of the corresponding one of the display devices, other end faces of the image transmission means corresponding to the adjacent ones of the display devices being in contact with each other, the plurality of image transmission means being bent toward the one direction in which the display devices are arranged. Alternatively, a display apparatus of the invention includes: a plurality of display devices disposed in two directions, each of the plurality of display devices having a display area; a plurality of image transmission means corresponding to the respective display devices, one end face of each of the image transmission means being coupled to a display area of the corresponding one of the display devices, other end faces of the image transmission means corresponding to the adjacent ones of the display devices being in contact with each other, some of the plurality of image transmission means each having inward facing slopes and outward facing slopes on two pairs of opposing faces, the outward facing slopes of the image transmission means being directed to a direction in which the corresponding display device has no adjacent display devices.

摘要翻译： 本发明的显示装置包括：沿一个方向布置的多个显示装置，所述多个显示装置中的每一个具有显示区域; 以及对应于各个显示装置的多个图像传输装置，每个图像传输装置的一个端面耦合到相应的一个显示装置的显示区域，对应于图像传输装置的另一个端面 相邻的显示装置彼此接触，所述多个图像传输装置朝向显示装置布置的一个方向弯曲。 或者，本发明的显示装置包括：多个显示装置，其设置在两个方向上，所述多个显示装置中的每一个具有显示区域; 与各个显示装置对应的多个图像传输装置，每个图像传输装置的一个端面耦合到对应的一个显示装置的显示区域，图像传输装置的与相邻的显示装置相对应的另一个端面 所述显示装置中的一个相互接触，所述多个图像传输装置中的一些图像传输装置中的每一个在两对相对的面上具有向内的斜面和向外的斜面，所述图像传输装置的向外的斜面被引导到 其中相应的显示装置没有相邻的显示装置。

公开(公告)号：US5446719A

公开(公告)日：1995-08-29

申请号：US13038

申请日：1993-02-03

申请人： Yoshio Yoshida ,  Yukio Kurata ,  Shigeki Tsuji

发明人： Yoshio Yoshida ,  Yukio Kurata ,  Shigeki Tsuji

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

CPC分类号： G11B7/1353 ,  G11B7/123

摘要： An optical information reproducing apparatus of the invention includes a light emitting and receiving unit and an optical system. The optical system converges light from the light emitting and receiving unit on a recording medium and converges the light after reflected by the recording medium. The light emitting and receiving unit includes: a semiconductor laser device disposed on a substrate for generating light; a photo detector formed, integrally with the substrate, on the substrate on which the semiconductor laser device is disposed, for outputting a signal corresponding to the intensity of light incident thereon; and a beam splitter provided on an optical axis of the reflected light, the beam splitter leading part of the reflected light to the photo detector.

摘要翻译： 本发明的光信息再现装置包括发光和接收单元和光学系统。 光学系统将来自发光和接收单元的光会聚在记录介质上，并在被记录介质反射之后会聚该光。 发光和接收单元包括：设置在用于产生光的基板上的半导体激光器件; 与基板一体形成的光电检测器，其上设置有半导体激光装置的基板，用于输出对应于入射到其上的光的强度的信号; 以及设置在反射光的光轴上的分束器，分束器将反射光的一部分引导到光电检测器。

公开(公告)号：US5428595A

公开(公告)日：1995-06-27

申请号：US9911

申请日：1993-01-27

申请人： Yoshio Yoshida ,  Hideaki Sato ,  Yukio Kurata ,  Hiroyuki Yamamoto ,  Nobuo Ogata ,  Katsuhiro Kubo

发明人： Yoshio Yoshida ,  Hideaki Sato ,  Yukio Kurata ,  Hiroyuki Yamamoto ,  Nobuo Ogata ,  Katsuhiro Kubo

IPC分类号： G11B7/09 ,  G11B7/135 ,  G11B17/32

CPC分类号： G11B7/1353

摘要： An optical information recording and reproducing device is provided. The device includes a light source for emitting a light beam, a first diffraction element for splitting the light beam into at least three diffracted beams, an optical system guiding the diffracted beams to a recording medium, and a second diffraction element including at least one division line and a diffraction surface from which the diffracted beams are diffracted. The diffraction surface is divided into at least two regions by the division line or lines. One of the division lines is at a predetermined angle against the direction of a track on the recording medium, and the regions split each of the diffracted beams into at least two parts to diffract the parts in different directions. The device also includes an optical detecting element for detecting the light beams diffracted with the second diffraction element.

摘要翻译： 提供了一种光信息记录和再现装置。 该装置包括用于发射光束的光源，用于将光束分成至少三个衍射光束的第一衍射元件，将衍射光束引导到记录介质的光学系统，以及包括至少一个分割部分的第二衍射元件 线衍射面和衍射光束衍射的衍射面。 通过划分线或线将衍射面分成至少两个区域。 分割线之一与记录介质上的轨道的方向成预定角度，并且区域将每个衍射光束分成至少两个部分，以在不同方向上衍射该部分。 该装置还包括用于检测与第二衍射元件衍射的光束的光学检测元件。

公开(公告)号：US5410623A

公开(公告)日：1995-04-25

申请号：US111144

申请日：1993-08-24

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

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

IPC分类号： G02B6/122 ,  G02B6/12 ,  G02B6/132 ,  G02B6/26 ,  G02B6/42

CPC分类号： G02B6/132 ,  G02B6/262 ,  G02B6/4207 ,  G02B2006/12038 ,  G02B2006/12095 ,  G02B2006/12116 ,  G02B2006/12195

摘要： An optical device includes: a first dielectric slab waveguide having an effective refractive index N.sub.1 ; a second dielectric slab waveguide having an effective refractive index N.sub.2 ; and a third dielectric slab waveguide having a length 1 and an effective refractive index N.sub.3, the third dielectric slab waveguide being formed between the first dielectric slab waveguide and the second dielectric slab waveguide so as to connect the first dielectric slab waveguide with the second dielectric slab waveguides optically; wherein the length I and the effective refractive index N.sub.3 substantially satisfy following equations; ##EQU1## where .lambda. is a free-space wavelength of light traveling in the optical device and the light travels from the first dielectric slab waveguide to the third dielectric slab waveguide at an incident angle .THETA. in a single mode.

摘要翻译： 光学装置包括：具有有效折射率N1的第一电介质平板波导; 具有有效折射率N2的第二电介质平板波导; 以及具有长度1和有效折射率N3的第三电介质平板波导，所述第三电介质平板波导形成在所述第一电介质平板波导和所述第二电介质平板波导之间，以将所述第一电介质平板波导与所述第二电介质平板 光波导; 其中长度I和有效折射率N3基本上满足以下等式; 其中λ是在光学器件中行进的光的自由空间波长，并且光以单一模式以入射角THETA从第一电介质平板波导传播到第三电介质平板波导。

公开(公告)号：US5283690A

公开(公告)日：1994-02-01

申请号：US503039

申请日：1990-04-02

申请人： Takahiro Miyake ,  Yoshio Yoshida ,  Yukio Kurata

发明人： Takahiro Miyake ,  Yoshio Yoshida ,  Yukio Kurata

IPC分类号： G02B5/18 ,  G11B7/135 ,  G02B27/44

CPC分类号： G11B7/1353 ,  G02B5/1814 ,  G02B5/1857 ,  G02B5/1871

摘要： An optical diffraction grating element comprising diffraction gratings having a configuration in which grooves and flat lands each positioned between the adjacent grooves are successively alternately formed, wherein the diffraction gratings have the same groove depth, groove width and groove tilt angle in order to obtain a constant 0th-order diffraction efficiency and first-order diffraction efficiency in the optical diffraction grating element while the pitches of the diffraction gratings are made different by setting a different land width for each diffraction grating.

摘要翻译： 一种光学衍射光栅元件，包括衍射光栅，该衍射光栅具有这样一种构造，其中相邻沟槽之间的槽和平坦的焊盘位于相邻的槽之间，其中衍射光栅具有相同的槽深度，槽宽度和槽倾斜角，以获得恒定的 光衍射光栅元件的0次衍射效率和一级衍射效率，而衍射光栅的间距通过为每个衍射光栅设定不同的焊盘宽度而不同。