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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：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。
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3.发明授权
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
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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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
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.
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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
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。
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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.
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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
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。
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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：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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