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71. 发明公开

EP0453323A2 Optical pickup device 有权
标题翻译： Optische Abtastvorrichtung。
公开(公告)号：EP0453323A2
公开(公告)日：1991-10-23
申请号：EP91303579.6
申请日：1991-04-22
申请人： SHARP KABUSHIKI KAISHA
发明人： Miyake, Takahiro , Yoshida, Yoshio , Kurata, Yukio
IPC分类号： G11B7/09 , G11B7/125 , G11B7/135 , G02B13/10 , G02B27/00
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 (11), a shaping prism (14), an diffracting element (12) and a photodetector (17). 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 (12) 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 (17) 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. Here, 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.
摘要翻译：一种光拾取装置，其具有至少设置有光源的光学系统，成形棱镜，衍射元件和光电检测器。光源投射其光轴在垂直于光轴的截面中具有椭圆形形状的光。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。衍射元件具有基本上平行于基准方向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基本平行。衍射元件衍射反射光，使其聚光在光电检测器上。这里，从光源的突出点延伸通过光电检测器的光接收面的中心的假想线也被设置为平行于参考方向。例如，当成形棱镜相对于其短轴方向成形具有椭圆形的强度分布时，光学系统被布置成使得亮部的短轴平行于衍射元件的分割线。因此，可以总是获得精确的聚焦控制信号。

72. 发明公开

EP0353748A3 A process for preparing blazed holograms 有权
标题翻译：一种制备BLAZED HOLOGRAMS的方法
公开(公告)号：EP0353748A3
公开(公告)日：1991-09-04
申请号：EP89114345.5
申请日：1989-08-03
申请人： SHARP KABUSHIKI KAISHA
发明人： Kubo, Katsuhiro , Sakai, Keiji , Kurata, Yukio , Yamaoka, Hideyoshi
IPC分类号： B29C45/00 , G02B5/18 , G03H1/18
CPC分类号： B29D11/00769 , B29C45/00 , B29C45/0001 , B29C45/372 , B29D11/00 , B29L2031/7224 , G03H1/0244 , G03H1/0276 , G03H2001/0212 , G03H2001/0284 , G03H2001/0288 , G03H2260/14 , G03H2260/63 , G03H2270/11
摘要： A process for preparing blazed hologram suitable for mass-production which comprises fabricating a glass or metal plate (5) having a surface of serrated cross section, disposing the glass or metal plate in an injection mold (6) to allow the surface of serrated cross section to constitute an inner surface of the mold, injecting an acrylic resin in molten form into the mold under a specific molding pressure, and removing a molded acrylic resin (10) from the glass plate or metal plate to obtain an acrylic blazed hologram.

73. 发明公开

EP0428390A2 Manufacturing method of optical diffraction grating element 失效
$Manufacturing method of optical diffraction grating element$
标题翻译： Herstellungsverfahrenfürein optisches Beugungsgitter。
公开(公告)号：EP0428390A2
公开(公告)日：1991-05-22
申请号：EP90312388.3
申请日：1990-11-13
申请人： SHARP KABUSHIKI KAISHA
发明人： Sakai, Keiji , Kubo, Katsuhiro , Kurata, Yukio
IPC分类号： G02B5/18
CPC分类号： G02B5/1857
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其上的抗蚀剂膜根据衍射光栅的图案的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。

74. 发明公开

EP0380320A2 An optical pickup apparatus 有权
标题翻译： OptischesAbtastgerät。
公开(公告)号：EP0380320A2
公开(公告)日：1990-08-01
申请号：EP90300741.7
申请日：1990-01-24
申请人： SHARP KABUSHIKI KAISHA
发明人： Nishitani, Yukinori , Kurata, Yukio , Yoshida, Yoshio , Miyake, Takahiro
IPC分类号： G11B7/135 , G11B7/09
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 apparatus comprises a light source (1) and an optical device (2) having a grating pattern for splitting a light beam from said source into a zero-order diffracted beam and plus and minus first-order diffracted beams. The grating pattern has a centre portion (a) and one or more side portions (b). The efficiency of the centre portion (a) for the zero-order diffracted beam is greater than the efficiency of the side portions (b) 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。光拾取装置包括光源（1）和具有光栅图案的光学装置（2），用于将来自所述源的光束分成零级衍射光束以及正负衍射光束。光栅图案具有中心部分（a）和一个或多个侧面部分（b）。零级衍射光束的中心部分（a）的效率大于零级衍射光束的侧部（b）的效率。

75. 发明公开

EP0311463A3 An optical information reproducing apparatus 失效
标题翻译：光信息再现设备
公开(公告)号：EP0311463A3
公开(公告)日：1990-07-11
申请号：EP88309460.9
申请日：1988-10-10
申请人： SHARP KABUSHIKI KAISHA
发明人： Yoshida, Yoshio , Nagahama, Toshiya , Kubo, Katuhiro , Kurata, Yukio
IPC分类号： G11B7/09
CPC分类号： G11B7/133 , G11B7/1353
摘要： An optical information-reproducing apparatus comprising a light emitting means (11), and an optical system (13) that focuses light emitted from the light emitting means on a recording medium (14) and that detects the reflected light from the recording medium to supply to a diffracting element (12), and a photodetector (15) that includes a plurality of photodetecting portions (15a,b,c,d) divided by division lines and that converts the diffracted light from the diffracting element focussed on the division lines into an electrical signal by the photodetecting portions on both sides of the division lines, wherein the photodetector is so constructed that division lines on which diffracted light from the diffracting element is focused are inclined with respect to the direction of the diffraction of the reflected light in the diffracting element such that the amount of focusing spot light received by the photodetecting portions on both sides of the division lines become substantially equal.
摘要翻译：一种光信息再现装置，包括发光装置（11）和将从发光装置发射的光聚焦在记录介质（14）上的光学系统（13），并且检测来自记录介质的反射光以供应涉及衍射元件（12），以及光电检测器（15），其包括被分割线分割的多个光电检测部分（15a，b，c，d），并将来自聚焦在分割线上的衍射元件的衍射光转换成通过分割线两侧的受光部分的电信号，其中光电检测器被构造成使得来自衍射元件的衍射光聚焦的分割线相对于反射光的衍射方向倾斜衍射元件使得由分割线两侧的光电检测部分接收的聚焦光斑的量变得基本相等。

76. 发明公开

EP0338840A3 Optical pick-up device 失效
标题翻译：光学拾取装置
公开(公告)号：EP0338840A3
公开(公告)日：1990-07-04
申请号：EP89303962.8
申请日：1989-04-20
申请人： SHARP KABUSHIKI KAISHA
发明人： Kurata, Yukio , Yoshida, Yoshio , Nagahama, Toshiya
IPC分类号： G11B7/09 , G11B7/135
CPC分类号： G11B7/0903 , G11B7/0916 , G11B7/123 , G11B7/1353 , G11B7/1381
摘要： An optical pick-up device which is capable of letting the laser beam (A) emitted from a light emitting element (1) focus through an optical system (2, 3, 4) on a recording medium (5), also of focusing a reflected beam (B) from the recording medium through the same optical system on a photo-detecting element (6), and also capable of detecting a tracking error signal and a focusing error signal from the output signals from the photo-detecting element, characterized in that there is arranged a diffracting element (2) before the light emitting element and the photo-detecting element, the region on the diffracting element is divided into two sub-regions (2a, 2b) by a parting line substantially perpendicular to the track direction, in one of these sub-regions there is formed a diffraction grating for separating two sub-spots in the two directions from the laser beam emitted from the light emitting element for applying the so-called 3-spot method, and in the other sub-region there is arranged a diffraction grating causing the reflected beams from the recording medium focused on the photo-detecting element respectively, and, the focusing error signal is detected by the so-called knife edge method, the tracking error signal is detected by the so-called 3-spot method to thereby prevent the occurrence of offset with regard to the tracking error signal due to displacement of the optical axis of the optical system, and moreover the number of the optical parts can be reduced.
摘要翻译：一种光学拾取装置，其能够使从发光元件（1）发射的激光束（A）通过光学系统（2,3,4）聚焦在记录介质（5）上，还聚焦通过光检测元件（6）上的相同光学系统从记录介质反射的光束（B），并且还能够检测来自光检测元件的输出信号的跟踪误差信号和聚焦误差信号，其特征在于，在发光元件和光检测元件之前配置有衍射元件（2）的情况下，衍射元件上的区域被大致垂直于轨道的分割线分割成两个子区域（2a，2b）在其中一个子区域中形成衍射光栅，用于从用于施加所谓的3点法的发光元件发射的激光束分离两个方向上的两个子点，并且在另一个分区域有ar 该衍射光栅使得来自记录介质的反射光束分别聚焦在光检测元件上，并且通过所谓的刀口法检测聚焦误差信号，跟踪误差信号由所谓的3 从而防止由于光学系统的光轴的位移引起的跟踪误差信号的偏移的发生，并且此外可以减少光学部件的数量。

77. 发明公开

EP0311463A2 An optical information reproducing apparatus 失效
标题翻译：一种光学信息重放装置
公开(公告)号：EP0311463A2
公开(公告)日：1989-04-12
申请号：EP88309460.9
申请日：1988-10-10
申请人： SHARP KABUSHIKI KAISHA
发明人： Yoshida, Yoshio , Nagahama, Toshiya , Kubo, Katuhiro , Kurata, Yukio
IPC分类号： G11B7/09
CPC分类号： G11B7/133 , G11B7/1353
摘要： An optical information-reproducing apparatus comprising a light emitting means (11), and an optical system (13) that focuses light emitted from the light emitting means on a recording medium (14) and that detects the reflected light from the recording medium to supply to a diffracting element (12), and a photodetector (15) that includes a plurality of photodetecting portions (15a,b,c,d) divided by division lines and that converts the diffracted light from the diffracting element focussed on the division lines into an electrical signal by the photodetecting portions on both sides of the division lines, wherein the photodetector is so constructed that division lines on which diffracted light from the diffracting element is focused are inclined with respect to the direction of the diffraction of the reflected light in the diffracting element such that the amount of focusing spot light received by the photodetecting portions on both sides of the division lines become substantially equal.
摘要翻译：一种光信息再生装置，其特征在于，具备：发光单元;以及光学系统，将从上述发光单元发出的光聚光在记录介质上，检测来自上述记录介质的反射光，（12）以及光检测器（15），该光检测器包括由分割线分割的多个光检测部（15a，b，c，d），并且将来自聚焦在分割线上的衍射元件的衍射光转换为由分割线两侧的光检测部分得到的电信号，其中光检测器的结构使得来自衍射元件的衍射光被聚焦的分割线相对于在分割线两侧的反射光的衍射方向倾斜使得分割线两侧的光检测部分所接收的聚焦点光量基本相等。

78. 发明公开

EP0298482A2 Image input device 失效
标题翻译： Bildeinlesevorrichtung。
公开(公告)号：EP0298482A2
公开(公告)日：1989-01-11
申请号：EP88110878.1
申请日：1988-07-07
申请人： SHARP KABUSHIKI KAISHA
发明人： Ishikawa, Toshio , Kurata, Yukio
IPC分类号： H04N1/10 , H04N1/028
CPC分类号： H04N1/0315 , H04N1/03 , H04N1/0313 , H04N1/0402 , H04N1/0408 , H04N1/0435 , H04N1/0455 , H04N1/107 , H04N1/1075 , H04N1/1935 , H04N2201/0048 , H04N2201/0077 , H04N2201/02493
摘要： An image input device of a portable type, which includes a light source (3) for reading an original document, a photo-electric converting element (4) for converting reflected light from the original document into an electrical signal, a memory function section (5) having a solid state memory element (6) for storing output of the photo-electric converting element (4), an output port (14) for external connection, and operating keys (12, 13) for operating the image input device.
摘要翻译：一种便携式图像输入装置，其包括用于读取原稿的光源（3），用于将来自原始文档的反射光转换为电信号的光电转换元件（4），存储功能部（ 5）具有用于存储光电转换元件（4）的输出的固态存储元件（6），用于外部连接的输出端口（14）和用于操作图像输入装置的操作键（12,13）。

79. 发明公开

EP0255305A2 Focusing error detecting device and method of manufacturing the same 失效
标题翻译： Anordnung zum Detektieren von Fokussierungsfehlern und deren Herstellungsverfahren。
公开(公告)号：EP0255305A2
公开(公告)日：1988-02-03
申请号：EP87306575.9
申请日：1987-07-24
申请人： SHARP KABUSHIKI KAISHA
发明人： Ogata, Nobuo , Nakata, Yasuo , Satou, Hideaki , Tanaka, Toshiyuki , Minami, Etsuji , Yoshida, Yoshio , Kurata, Yukio , Inoue, Teruaki
IPC分类号： G11B7/13 , G02B27/00
CPC分类号： G11B7/22 , G11B7/0909 , G11B7/13922
摘要： A focusing error detector comprises a light source (21), a collimator lens (22a) for making parallel the pencil of rays emitted by the light source (21), an objective lens (24a) which focuses the parallel pencil of rays to form a beam spot on a data-recording disc (23) with data tracks and guide tracks formed thereon and which receives the pencil of rays reflected from the data-recording disc (23), an optical system (26) for forming a beam spot from the reflected pencil of rays incident to the objective lens (24a), and an optical detector (27) having a plurality of divided optical sensor blocks (27a, 27b, 27c, 27d) for receiving the formed beam spot so as to detect the focusing error of the beam spot formed on the data-recording disc (23) 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（21），用于平行由光源（21）发射的光线的准直透镜（22a）;物镜（24a），其聚焦平行的光线以形成数据记录盘（23）上的数据记录盘（23）上的数据记录盘（23），其上形成有数据轨道和导轨，并且接收从数据记录盘（23）反射的光线;光学系统（26），用于从入射到物镜（24a）的反射的射线的铅笔和具有多个分开的光学传感器块（27a，27b，27c，27d）的光学检测器（27），用于接收形成的光束点，以便检测聚焦误差根据所接收的光束点的结构形成在数据记录盘（23）上的光束点。

80. 发明授权

EP0803868B1 Optical element and optical pickup device comprising the same 失效
标题翻译：一种光学部件，从而提供了一种光学再现装置。
公开(公告)号：EP0803868B1
公开(公告)日：2002-06-12
申请号：EP97111248.7
申请日：1990-03-30
申请人： SHARP KABUSHIKI KAISHA
发明人： Yoshida, Yoshio , Miyake, Takahiro , Nakata, Yasuo , Kurata, Yukio , Ogata, Nobuo , Ueyama, Tetsuo , Sato, Hideaki
IPC分类号： G11B7/135 , G11B11/10 , G02B5/18
CPC分类号： G11B7/1365 , G02B1/118 , G02B5/1809 , G02B5/1814 , G02B5/1866 , G02B27/4261 , G02B27/4272 , G11B7/1353 , G11B11/10543
摘要： An optical element comprises a polarization diffraction element (1) that is provided with diffraction gratings (3,4) that are respectively mounted on different faces of a transparent substrate (2) 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; or comprises a phase shifting element or an antireflection element composed by a grating which grating pitch is approximately equal to the wavelength of an incident light (5), formed on a transparent base; or comprises a polarization diffraction element (1) that is provided with a substrate (2) made of a material having an optical anisotropy property, and a grating (3,4), and wherein 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, and cancel out; or comprises a polarization diffraction unit wherein a diffraction grating which grating pitch is approximately equal to the wavelength of an incident light, is formed on a face of a transparent substrate, and a phase compensating grating which grating lines are substantially orthogonal to the grating lines of the diffraction grating, is formed on the other face of the substrate. An optical pickup device comprises an optical element wherein a grating which grating pitch is approximately equal to the wavelength of an incident light, is formed on a transparent base. An optical pickup device comprises a polarized light detecting unit provided with a diffraction grating which grating pitch is approximately equal to the wavelength of an incident light, that is formed on a transparent substrate, and that splits the incident light into two polarized lights having mutually orthogonal polarizations; a first photodetector that is mounted integrally and virtually in parallel with the substrate, and that receives a zeroth-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. As a result, a simple and inexpensive optical element may be fabricated, and a compact and light optical pickup device may be designed. Furthermore, the access to a magneto-optical recording medium may be performed accurately, and recording signals of high quality may be obtained.

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