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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
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。
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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
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。
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公开(公告)号：US5410529A
公开(公告)日：1995-04-25
申请号：US26177
申请日：1993-03-01
CPC分类号： G11B7/1353 , G11B7/123
摘要： An optical pickup apparatus for reading out information from an optical disk. The optical pickup includes a light source; and an optical device having a grating pattern for splitting a light beam from said the source into a zero-order diffracted beam and plus and minus first-order diffracted beams. The grating pattern has the center portion and one or more side portions. The efficiency of the center portion for the zero-order diffracted beam is greater than the efficiency of the side portions for the zero-order diffracted beam.
摘要翻译： 一种用于从光盘读出信息的光学拾取装置。 光学拾取器包括光源; 以及具有光栅图案的光学装置，用于将来自所述源的光束分解为零级衍射光束以及正负一级衍射光束。 光栅图案具有中心部分和一个或多个侧面部分。 零级衍射光束的中心部分的效率大于零级衍射光束的侧部的效率。
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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
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。
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公开(公告)号：US5306788A
公开(公告)日：1994-04-26
申请号：US837030
申请日：1992-02-14
IPC分类号： B29C33/62 , C08G18/40 , C08G18/42 , C08G18/46 , C08F283/04
CPC分类号： C08G18/4283 , B29C33/62 , C08G18/4018 , C08G18/4623 , B29K2075/00 , C08G2120/00 , C08G2125/00 , C08G2130/00
摘要： An elastomer is molded by a reaction injection molding of polyurethane resins, polyurea resins, polyurethane/urea resins and polyurea/amide resins in the presence of an internal release agent which is a polyester condensate of a saturated or unsaturated fatty acid having a hydroxy group produced by transesterification or a molecular endaminated or iminated polyester condensate. The elastomer has a good releasing property and a good coating property.
摘要翻译： 通过聚氨酯树脂，聚脲树脂，聚氨酯/尿素树脂和聚脲/酰胺树脂的反应注射成型在内部脱模剂的存在下成型弹性体，所述内部脱模剂是产生羟基的饱和或不饱和脂肪酸的聚酯缩合物 通过酯交换或分子聚氨酯或聚酯缩聚物。 弹性体具有良好的剥离性能和良好的涂布性能。
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公开(公告)号：US5202869A
公开(公告)日：1993-04-13
申请号：US705802
申请日：1991-05-28
申请人： Takahiro Miyake , Yoshio Yoshida , Yukio Kurata
发明人： Takahiro Miyake , Yoshio Yoshida , Yukio Kurata
CPC分类号： G02B13/10 , G02B19/0014 , G02B19/0052 , G02B27/09 , G02B27/0972 , G11B7/0916 , G11B7/094 , G11B7/131 , G11B7/1353 , G11B7/1359 , G11B7/1381 , G11B7/1398
摘要： An optical head device having an optical system provided with at least a light source, a shaping prism, a diffracting element and a photodetector. The light source emits light whose cross-sectional intensity distribution has an elliptic shape. The shaping prism directs the light to a recording medium after shaping the intensity distribution thereof into a circular shape. The diffracting element has diffracting regions formed by at least one division line parallel to a reference direction. The light reflected from the recording medium forms an elliptic bright portion on the diffracting element. The photodetector is divided by a plurality of division lines, at least one of which is parallel to the reference direction. When there is no focus error, the diffracting element diffracts the reflected light so as to converge it on the division line substantially parallel to the reference direction in the photodetector. For example, when the shaping prism is adapted to shape the elliptic intensity distribution with respect to its major axis direction, the optical system is arranged so that the major axis of the bright portion coincides with the division line of the diffracting element. Thus, it is possible to obtain preferable focusing control.
摘要翻译： 一种具有至少设置有光源的光学系统，成像棱镜，衍射元件和光电检测器的光学头装置。 光源发出横截面强度分布为椭圆形的光。 成形棱镜将其强度分布成形为圆形后将光引导到记录介质。 衍射元件具有由与基准方向平行的至少一个分割线形成的衍射区域。 从记录介质反射的光在衍射元件上形成椭圆形亮部。 光电检测器由多条分割线分开，其中至少一条与基准方向平行。 当不存在聚焦误差时，衍射元件将反射光衍射，使其在基本上平行于光检测器中的基准方向的分割线上会聚。 例如，当成形棱镜适于相对于其长轴方向成形椭圆强度分布时，光学系统被布置成使得亮部的长轴与衍射元件的分割线重合。 因此，可以获得优选的聚焦控制。
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公开(公告)号：US5173890A
公开(公告)日：1992-12-22
申请号：US687478
申请日：1991-04-18
申请人： Takahiro Miyake , Yoshio Yoshida , Yukio Kurata
发明人： Takahiro Miyake , Yoshio Yoshida , Yukio Kurata
CPC分类号： G02B27/0972 , G02B13/10 , G02B19/0028 , G02B19/0052 , G02B19/0085 , G02B27/09 , G11B7/0916 , G11B7/094 , G11B7/1353 , G11B7/1359 , G11B7/1398
摘要： An optical pickup device having an optical system provided with at least a light source, a shaping prism, a diffracting element and a photodetector. The light source projects light whose intensity distribution has an elliptical shape in its cross section orthogonal to the optical axis. The shaping prism directs the light to a recording medium after shaping the intensity distribution thereof into a circular shape. The diffracting element has diffraction regions formed by at least one division line substantially parallel to a reference direction. The light reflected from the recording medium forms an elliptical bright portion on the diffracting element. The photodetector is divided by a plurality of division lines, at least one of which is substantially parallel to the reference direction. The diffracting element diffracts the reflected light so as to converge it on the photodetector. Have, a hypothetical line extending from a projecting point of the light source through the center of a light-receiving face of the photodetector is also set to be parallel to the reference direction. For example, when the shaping prism is to shape the intensity distribution having the elliptical shape with respect to its minor axis direction, the optical system is arranged so that the minor axis of the bright portion is parallel to the division line of the diffracting element. Thus, it is possible to always obtain an accurate focusing control signal.
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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
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.
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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
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.
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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.
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