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1. 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.

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

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.

5. 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。

6. 发明授权

US5473470A Polarization detector 失效
标题翻译：极化探测器
公开(公告)号：US5473470A
公开(公告)日：1995-12-05
申请号：US093920
申请日：1993-07-21
申请人： Takahiro Miyake , Yoshio Yoshida , Yasuo Nakata , Yukio Kurata
发明人： Takahiro Miyake , Yoshio Yoshida , Yasuo Nakata , Yukio Kurata
IPC分类号： G01J4/04 , G02B5/18 , G02B5/30 , G02B27/28 , G11B11/10 , G11B11/105 , G11B7/00
CPC分类号： G01J4/04 , G02B27/283 , G02B5/1809 , G02B5/1814
摘要： A polarization detector includes a polarization diffraction element having a substrate with two facing surfaces which are placed in parallel with each other, a first diffraction grating formed on one surface of the substrate, and a second diffraction grating formed on the other surface of the substrate, with light being incident upon the first diffraction grating. Further, each grating pitch of the first diffraction grating and the second diffraction grating are nearly equal to a wavelength of the incident light. A limiting member is also included for limiting an incident region of the incident light with respect to the polarization diffraction element. The limiting member is formed on a light incident side of the first diffraction grating. Further, a converging lens is included for respectively converging light transmitted through the first diffraction grating and the second diffraction grating and light diffracted by the first diffraction grating and the second diffraction grating into different beam spots. Finally, a pair of photodetectors are included for detecting each optical intensity of the two beam spots converged by the converging lens.
摘要翻译：偏振检测器包括具有彼此平行放置的具有两个相对表面的基板的偏振衍射元件，形成在基板的一个表面上的第一衍射光栅和形成在基板的另一表面上的第二衍射光栅，光入射到第一衍射光栅上。此外，第一衍射光栅和第二衍射光栅的每个光栅间距几乎等于入射光的波长。还包括限制入射光相对于偏振衍射元件的入射区域的限制构件。限制部件形成在第一衍射光栅的光入射侧。此外，包括会聚透镜，用于分别会聚透过第一衍射光栅和第二衍射光栅的光以及由第一衍射光栅和第二衍射光栅衍射的光成为不同的光束点。最后，包括一对光检测器，用于检测由会聚透镜会聚的两束光束的每个光强度。

7. 再颁专利

USRE35332E Optical pickup device with diffraction device 失效
$Optical pickup device with diffraction device$
标题翻译：具有衍射装置的光学拾取装置
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。

8. 发明授权

US5128914A Optical pickup apparatus utilizing a diffraction device 失效
$Optical pickup apparatus utilizing a diffraction device$
标题翻译：使用衍射装置的光学拾取装置
公开(公告)号：US5128914A
公开(公告)日：1992-07-07
申请号：US464013
申请日：1990-01-12
申请人： Yukio Kurata , Yoshio Yoshida , Yasuo Nakata , Takahiro Miyake
发明人： Yukio Kurata , Yoshio Yoshida , Yasuo Nakata , Takahiro Miyake
IPC分类号： G11B7/09 , G11B7/135
CPC分类号： G11B7/1381 , G11B7/0903 , G11B7/0916 , G11B7/094 , G11B7/1353
摘要： An optical pickup apparatus comprising a diffraction device in which a laser beam from a light source is diffracted by the diffraction device to produce a main beam and two sub-beams which are focused on a recording medium, the beams reflected from the recording medium aare diffracted by the diffraction device to be directed to at least one photodetector, whereby a tracking error signal can be detected from output signals of the photodetector by the three-spot method that is so highly reliable that an offset never arises in the tracking error signal even when the optical axis of the optical system is displaced from a given position.

9. 发明授权

US5049732A Optical pickup device with diffraction device 失效
$Optical pickup device with diffraction device$
标题翻译：具有衍射装置的光学拾取装置
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.

10. 发明授权

US5257131A Polarization diffraction element and polarization detector employing the same 失效
$Polarization diffraction element and polarization detector employing the same$
标题翻译：偏振衍射元件和采用其的偏振检测器
公开(公告)号：US5257131A
公开(公告)日：1993-10-26
申请号：US713840
申请日：1991-06-12
申请人： Yoshio Yoshida , Takahiro Miyake , Yasuo Nakata , Yukio Kurata
发明人： Yoshio Yoshida , Takahiro Miyake , Yasuo Nakata , Yukio Kurata
IPC分类号： G02B5/18 , G02B27/28 , G11B7/135 , G11B11/105 , G02B5/30 , G11B7/12
CPC分类号： G11B7/1353 , G02B27/28 , G02B27/283 , G02B27/4261 , G02B27/4272 , G02B5/1809 , G02B5/1814 , G11B11/10543
摘要： A polarization diffraction element comprising two diffraction gratings formed on both faces of a substrate respectively. Both the diffraction gratings have grating lines which are arranged at the same grating pitch, and whose directions mutually form a predetermined minute angle. The grating lines may also be arranged parallel to each other. In this case, the relationship between grating pitches D.sub.1, D.sub.2 of the respective diffraction gratings and the wavelength .lambda. of an incident light is expressed as:0

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