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1. 发明授权

US5428595A Optical information recording and reproducing device 失效
标题翻译：光信息记录和再现装置
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。

2. 发明授权

US5085496A Optical element and optical pickup device comprising it 失效
标题翻译：光学元件和包含它的光学拾取器件
公开(公告)号：US5085496A
公开(公告)日：1992-02-04
申请号：US500292
申请日：1990-03-28
申请人： Yoshio Yoshida , Takahiro Miyake , Yasuo Nakata , Yukio Kurata , Nobuo Ogata , Tetsuo Ueyama , Hideaki Sato
发明人： Yoshio Yoshida , Takahiro Miyake , Yasuo Nakata , Yukio Kurata , Nobuo Ogata , Tetsuo Ueyama , Hideaki Sato
IPC分类号： G02B5/18 , G11B7/135 , G11B11/105
CPC分类号： G11B7/1365 , G02B1/118 , G02B27/4261 , G02B27/4272 , G02B5/1809 , G02B5/1814 , G02B5/1866 , G11B11/10543 , G11B7/1353
摘要： An optical element comprises a polarization diffraction element that is provided with diffraction gratings that are respectively mounted on different faces of a transparent substrate of a flat plate shape, which grating pitches are equal to each other and approximately equal to the wavelength of an incident light, and which grating lines are parallel. The thickness of the substrate is set such that the difference that occurs between the phases of the P and S polarizations of a light due to the grating, and the difference that occurs between the phases of the two polarizations when the light propagates through the substrate cancel out. The optical pickup device comprising the optical element includes a polarized light detecting unit provided with a diffraction grating which grating pitch is approximately equal to the wavelength of an incident light; a first photodetector that is mounted integrally and virtually in parallel with the substrate, and that receives a zero-order diffracted light produced by the diffraction grating; and a second photodetector that is located in the same plane as the first photodetector and mounted integrally with the first photodetector and the substrate, and that receives a first-order diffracted light produced by the diffraction grating.

3. 发明授权

US4812638A Focusing error detector and optical data detecting device incorporating the focusing error detector 失效
标题翻译：聚焦误差检测器和结合了聚焦误差检测器的光学数据检测装置
公开(公告)号：US4812638A
公开(公告)日：1989-03-14
申请号：US78773
申请日：1987-07-28
申请人： Nobuo Ogata , Yasuo Nakata , Hideaki Satou , Toshiyuki Tanaka , Etsuji Minami , Yoshio Yoshida , Yukio Kurata , Teruaki Inoue, deceased
发明人： Nobuo Ogata , Yasuo Nakata , Hideaki Satou , Toshiyuki Tanaka , Etsuji Minami , Yoshio Yoshida , Yukio Kurata , Teruaki Inoue, deceased
IPC分类号： G11B7/09 , G11B7/135 , G01J1/20
CPC分类号： G11B7/22 , G11B7/0909 , G11B7/13922
摘要： A focusing error detector comprises a light source, a collimator lens for making parallel the pencil of rays emitted by the light source, an objective lens which focuses the parallel pencil of rays to form a beam spot on a data-recording disc with data tracks and guide tracks formed thereon and which receives the pencil of rays reflected from the data-recording disc, an optical system for forming a beam spot from the reflected pencil of rays incident to the objective lens, and an optical detector having a plurality of divided optical sensor blocks for receiving the formed beam spot so as to detect the focusing error of the beam spot formed on the data-recording disc on the basis of the configuration of the received beam spot.
摘要翻译：聚焦误差检测器包括光源，用于使平行于光源发射的光线的准直透镜，物镜，其将平行的光线聚焦以形成具有数据轨迹的数据记录盘上的光点，形成在其上的导轨，其接收从数据记录盘反射的光线，用于从入射到物镜的反射的射线形成束斑的光学系统;以及光学检测器，具有多个分开的光学传感器用于接收形成的光束点的块，以便根据接收的光束点的配置来检测形成在数据记录盘上的光束点的聚焦误差。

4. 发明授权

US5253237A Optical head device 失效
标题翻译：光头设备
公开(公告)号：US5253237A
公开(公告)日：1993-10-12
申请号：US533401
申请日：1990-06-05
申请人： Takahiro Miyake , Yoshio Yoshida , Yukio Kurata , Yasuo Nakata , Katsuhiro Kubo
发明人： Takahiro Miyake , Yoshio Yoshida , Yukio Kurata , Yasuo Nakata , Katsuhiro Kubo
IPC分类号： G11B7/09 , G11B7/13 , G11B7/135 , G11B7/00
CPC分类号： G11B7/0916 , G11B7/0903 , G11B7/0912 , G11B7/13 , G11B7/1353
摘要： The invention discloses an optical head device having a diffraction grating element divided into a plurality of diffraction gratings have a substantially equal diffraction angle, a substantially equal optical utilization efficiency, and different focal distances of first order diffracted lights, each of the first order diffracted lights being produced from a reflected light from the recording medium, at the respective diffraction gratings and a photodetector positioned at a mid-position between two focal points produced when there occurs no focusing error, the photo-detecting means having a plurality of photo-detecting parts juxtaposed in a direction substantially orthogonal to an average diffracting direction of the diffraction grating element. The above arrangement enables to produce a small size optical head device and improve the detecting of focusing errors and tracking errors.

5. 发明授权

US5279924A Manufacturing method of optical diffraction grating element with serrated gratings having uniformly etched grooves 失效
$Manufacturing method of optical diffraction grating element with serrated gratings having uniformly etched grooves$
标题翻译：具有均匀蚀刻凹槽的锯齿形光栅的光学衍射光栅元件的制造方法
公开(公告)号：US5279924A
公开(公告)日：1994-01-18
申请号：US908866
申请日：1992-07-01
申请人： Keiji Sakai , Katsuhiro Kubo , Yukio Kurata , Takahiro Miyake , Yoshio Yoshida
发明人： Keiji Sakai , Katsuhiro Kubo , Yukio Kurata , Takahiro Miyake , Yoshio Yoshida
IPC分类号： G02B5/18 , G11B7/135 , G03C5/00
CPC分类号： G11B7/1353 , G02B5/1814 , G02B5/1857 , G02B5/1871
摘要： The method of manufacturing an optical diffraction grating element of the present invention is characterized in adopting an ion beam made from a gas chemically reacting with a glass substrate when forming a diffraction grating having a serrated profile upon the glass substrate through an ion beam etching method. Also, when manufacturing an optical diffraction grating element that is divided into a plurality of regions whereon diffraction gratings having different diffraction angles with respect to an incident light are provided, the method of the present invention is characterized in forming slits into a resist film disposed upon a transparent substrate such as a glass substrate, in accordance with the patterns of the diffraction gratings, such that the width of the slits is constant irrespectively of the regions. Accordingly, the method of manufacturing an optical diffraction grating element of the present invention enables to improve the diffraction efficiency of the optical diffraction grating element, and to enhance the optical efficiency of an optical head device. The SN ratio of the output signals released by the optical head device may be thus improved and the servo error control executed accurately.
摘要翻译：本发明的光学衍射光栅元件的制造方法的特征在于，在通过离子束蚀刻法在玻璃基板上形成具有锯齿状的衍射光栅时，采用由与玻璃基板发生化学反应的气体制成的离子束。此外，当制造被分成多个区域的光学衍射光栅元件，其中衍射光栅相对于入射光具有不同衍射角的衍射光栅时，本发明的方法的特征在于将狭缝形成为设置在根据衍射光栅的图案，诸如玻璃基板的透明基板，使得狭缝的宽度与区域无关地是恒定的。因此，本发明的光学衍射光栅元件的制造方法能够提高光学衍射光栅元件的衍射效率，提高光学头装置的光学效率。可以提高由光头装置释放的输出信号的SN比，并且精确地执行伺服误差控制。

6. 发明授权

US4985880A Optical information recording and reproducing apparatus 失效
标题翻译：光信息记录和再现装置
公开(公告)号：US4985880A
公开(公告)日：1991-01-15
申请号：US247355
申请日：1988-09-21
申请人： Yoshio Yoshida , Nobuo Ogata , Mitsuo Ishii , Yukio Kurata , Yasuo Nakata , Takayuki Inoue , Kazuko Inoue
发明人： Yoshio Yoshida , Nobuo Ogata , Mitsuo Ishii , Yukio Kurata , Yasuo Nakata , Takayuki Inoue , Kazuko Inoue
IPC分类号： G11B11/10 , G11B11/105 , G11B27/36
CPC分类号： G11B11/10595 , G11B11/10504 , G11B11/10515 , G11B27/36
摘要： An improved optical information recording and reproducing apparatus which is capable of detecting recording errors simultaneously with recording function for reduction of recording time, without requiring particular high accuracy for an optical system, and avoiding complication in the construction and consequent large size of the optical system.

7. 发明授权

US5050155A Pick-up device for use in an optical information recording system utilizing a diffraction grating with blaze characteristics 失效
$Pick-up device for use in an optical information recording system utilizing a diffraction grating with blaze characteristics$
标题翻译：拾取装置用于利用具有火焰特征的衍射光栅的光学信息记录系统
公开(公告)号：US5050155A
公开(公告)日：1991-09-17
申请号：US330429
申请日：1989-03-30
申请人： Yukio Kurata , Hideaki Sato , Yasuo Nakata , Nobuo Ogata
发明人： Yukio Kurata , Hideaki Sato , Yasuo Nakata , Nobuo Ogata
IPC分类号： G11B7/12 , G11B7/135 , G11B7/00
CPC分类号： G11B7/1353 , G11B7/123
摘要： A pick-up device which includes a light source and a condenser lens for effecting recording and reproduction of information by projecting a light beam as collected by the condenser lens onto a recording medium. A diffraction grating is provided between the light source and the condenser lens for dividing light returning from the recording medium by a diffraction grating so as to be directed to a photo-detector, to thereby obtain an optical detection signal.

8. 发明授权

US4849825A Pick-up device for use in an optical information recording system 失效
标题翻译：用于光学信息记录系统的拾取装置
公开(公告)号：US4849825A
公开(公告)日：1989-07-18
申请号：US928395
申请日：1986-11-10
申请人： Yukio Kurata , Hideaki Sato , Yasuo Nakata , Nobuo Ogata , Teruaki Inoue
发明人： Yukio Kurata , Hideaki Sato , Yasuo Nakata , Nobuo Ogata , Teruaki Inoue
IPC分类号： G11B7/12 , G11B7/135
CPC分类号： G11B7/1353 , G11B7/123
摘要： A pick-up device which includes a light source and a condenser lens for effecting recording and reproduction of information by projecting a light beam as collected by the condenser lens onto a recording medium. A diffraction grating is provided between the light source and the condenser lens for dividing light returning from the recording medium by a diffraction grating so as to be directed to a photo-detector, to thereby obtain an optical detection signal.
摘要翻译：一种拾取装置，其包括光源和聚光透镜，用于通过将由聚光透镜收集的光束投射到记录介质上来进行信息的记录和再现。在光源和聚光透镜之间设置衍射光栅，用于通过衍射光栅分离从记录介质返回的光，以便被引导到光检测器，从而获得光检测信号。

9. 发明授权

US5283772A Optical head 失效
标题翻译：光头
公开(公告)号：US5283772A
公开(公告)日：1994-02-01
申请号：US65458
申请日：1993-05-20
申请人： Takahiro Miyake , Yoshio Yoshida , Yukio Kurata , Hideaki Sato
发明人： Takahiro Miyake , Yoshio Yoshida , Yukio Kurata , Hideaki Sato
IPC分类号： G11B7/13 , G11B7/135 , G11B7/09
CPC分类号： G11B7/1353 , G11B7/131 , G11B7/1356 , G11B7/1398
摘要： An optical head comprising a diffracting element having two tracking diffracting regions separated by a division line extending in a direction corresponding to a track direction of a recording medium, and one focusing diffracting region separated from the tracking diffracting regions by a division line extending in a direction corresponding to a radial direction of the recording medium. The optical head further comprises a light receiving element having two tracking light receiving regions for receiving diffracted lights produced in the tracking diffracting regions, and two adjoining focusing light receiving regions for receiving a diffracted light produced in the focusing diffracting region. The diffracted light produced in the focusing diffracting region always has a substantially constant light intensity, even when a tracking error occurs. As a result, an offset can be prevented from occurring in a focus error signal by finely adjusting the diffracting element.
摘要翻译：一种光学头，包括具有两个跟踪衍射区域的衍射元件，所述跟踪衍射区域被沿着与记录介质的轨道方向对应的方向延伸的分割线分隔开，并且一个聚焦衍射区域与跟踪衍射区域分开，对应于记录介质的径向。光头还包括具有两个跟踪光接收区域的光接收元件，用于接收在跟踪衍射区域中产生的衍射光，以及两个相邻的聚焦光接收区域，用于接收在聚焦衍射区域中产生的衍射光。即使发生跟踪误差，在聚焦衍射区域中产生的衍射光总是具有基本恒定的光强度。结果，可以通过精细调节衍射元件来防止在聚焦误差信号中发生偏移。

10. 发明授权

US5509094A Mode splitter and a magneto-optical disk pick-up device having the mode splitter 失效
标题翻译：模式分离器和具有模式分离器的磁光盘拾取装置
公开(公告)号：US5509094A
公开(公告)日：1996-04-16
申请号：US213800
申请日：1994-03-16
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 , 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 are provided. 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：提供了一种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。

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