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31. 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。

32. 发明授权

US5428472A Optical scan device having an optical diffraction grating element 失效
$Optical scan device having an optical diffraction grating element$
标题翻译：具有光学衍射光栅元件的光学扫描装置
公开(公告)号：US5428472A
公开(公告)日：1995-06-27
申请号：US114140
申请日：1993-08-31
申请人： Takahiro Miyake , Yoshio Yoshida , Yukio Kurata
发明人： Takahiro Miyake , Yoshio Yoshida , Yukio Kurata
IPC分类号： G02B5/18 , G11B7/135 , G02B27/44
CPC分类号： G11B7/1353 , G02B5/1814 , G02B5/1857 , G02B5/1871
摘要： An optical scan device comprising a light source and an optical diffraction grating element movable relatively to the light source, which is designed to substantially linearly scan a recording medium in a predetermined direction with a uniform light amount of a light beam emitted from the light source as the optical diffraction grating element moves relatively to the light source. The 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：一种光学扫描装置，包括光源和相对于光源可移动的光学衍射光栅元件，其被设计成以从光源发射的光束的均匀光量基本上沿预定方向线性扫描记录介质，光学衍射光栅元件相对于光源移动。光学衍射光栅元件包括衍射光栅，其具有连续交替形成沟槽和平坦的焊盘之间的构造，其中衍射光栅具有相同的槽深度，槽宽度和槽倾斜角，以获得常数光衍射光栅元件的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。

33. 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.

34. 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。

35. 发明授权

US5515354A Optical pickup 失效
标题翻译：光学拾音
公开(公告)号：US5515354A
公开(公告)日：1996-05-07
申请号：US363227
申请日：1994-12-22
申请人： Takahiro Miyake , Yoshio Yoshida , Yukio Kurata
发明人： Takahiro Miyake , Yoshio Yoshida , Yukio Kurata
IPC分类号： G11B7/135 , G11B7/00
CPC分类号： G11B7/1353
摘要： The optical pickup of the invention includes a hologram mirror for directing an optical axis of a light beam emitted from a light source to be perpendicular to the recording face of a recording medium. The hologram mirror includes: a light transmissive substrate having a first surface and a second surface which are opposite to each other, the light beam from the light source entering the substrate from the first surface; a transmissive holographic element, formed on the first substrate, for diffracting the light beam incident thereon to generate a plurality of diffracted beams; and a reflective film, formed on the second surface of the substrate, for reflecting the diffracted beams, wherein the holographic element includes a blazed grating which is designed to make a predetermined one of the diffracted beams most intense.
摘要翻译：本发明的光拾取器包括全息图反射镜，用于引导从光源发射的光束的光轴垂直于记录介质的记录面。全息镜包括：具有彼此相对的第一表面和第二表面的透光基板，来自光源的光束从第一表面进入基板; 形成在第一基板上的用于衍射入射到其上的光束以产生多个衍射光束的透射全息元件; 以及形成在所述基板的第二表面上用于反射所述衍射光束的反射膜，其中所述全息元件包括被设计成使预定的所述衍射光束最强烈的闪耀光栅。

36. 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

37. 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.

38. 发明授权

US5111449A Optical pick-up device using diffraction grating element having two sub-regions 失效
$Optical pick-up device using diffraction grating element having two sub-regions$
标题翻译：使用具有两个子区域的衍射元件的光学拾取器件
公开(公告)号：US5111449A
公开(公告)日：1992-05-05
申请号：US522631
申请日：1990-05-11
申请人： Yukio Kurata , Yoshio Yoshida , Toshiya Nagahama
发明人： Yukio Kurata , Yoshio Yoshida , Toshiya Nagahama
IPC分类号： G11B7/09 , G11B7/12 , G11B7/135
CPC分类号： G11B7/0903 , G11B7/0916 , G11B7/123 , G11B7/1353 , G11B7/1381
摘要： An optical pick-up device for focusing a laser beam emitted from a light emitting element through an optical system onto a recording medium. The beam is reflected from the recording medium and redirected through the same optical system on to a photodetector. A tracking error signal and a focusing error signal are produced from the output signals of the photo-detector. A diffracting element positioned before the light emitting element and the photo-detector and produces two sub-spots in two directions for applying the so-called 3-spots method from the laser beams that were projected from the light emitting element toward the recording medium. The diffracting element is divided into a first sub-region and a second sub-region formed in the same place and defined by a parting line aligned substantially perpendicular to the track direction. The first sub-region includes a diffraction grating for diffracting three beams that comprise a main beam toward the recording medium. The second sub-region includes a diffraction grating for diffracting the reflected beams of the three beams from the recording medium in the direction where the photo-detecting element is installed.

39. 发明授权

US4904856A Optical pickup device with diffraction sensing 失效
$Optical pickup device with diffraction sensing$
标题翻译：具有衍射感测的光学拾取装置
公开(公告)号：US4904856A
公开(公告)日：1990-02-27
申请号：US282109
申请日：1988-12-09
申请人： Toshiya Nagahama , Yukio Kurata , Yoshio Yoshida
发明人： Toshiya Nagahama , Yukio Kurata , Yoshio Yoshida
IPC分类号： G02B7/28 , G11B7/09 , G11B7/13 , G11B7/135
CPC分类号： G11B7/0916 , G11B7/0903 , G11B7/133 , G11B7/1353 , G11B7/1381
摘要： An optical pickup device includes a light source, an optical lens system that converges light beams from the light source onto a recording medium, a photodetector with three divided regions that detects light beams reflected from the recording medium, and a hologram optical element that introduces the reflected light beams from the recording medium into the photodetector. The hologram optical element is divided into two regions, a part of the reflected light beams from the recording medium is diffracted by the first region of the hologram optical element and focused on a division line in the direction of the diffraction of the hologram optical element. The division line divides the photodetector into two regions, the first region and the second region. The other part of the reflected light beams is diffracted by the second region of the hologram optical element and focused on the third region of the photodetector. A difference in the output intensity between the first and second regions of the photodetector results in a focus error signal and the total of the output intensity of the first, second and third regions of the photodetector results in an information signal.

40. 发明授权

US5440427A Optical pick-up device having an optical diffraction grating element 失效
$Optical pick-up device having an optical diffraction grating element$
标题翻译：具有光学衍射光栅元件的光学拾取装置
公开(公告)号：US5440427A
公开(公告)日：1995-08-08
申请号：US113830
申请日：1993-08-31
申请人： Takahiro Miyake , Yoshio Yoshida , Yukio Kurata
发明人： Takahiro Miyake , Yoshio Yoshida , Yukio Kurata
IPC分类号： G02B5/18 , G11B7/135 , G02B27/44
CPC分类号： G11B7/1353 , G02B5/1814 , G02B5/1857 , G02B5/1871
摘要： An optical pick-up device comprising an optical system including a light source and an optical diffraction grating element and a light receiving element, wherein the optical diffraction grating element guides the 0th-order diffracted lights of a light beam emitted from the light source onto a recording medium and guides the first-order diffracted lights of a reflected light from the recording medium onto the light receiving element to produce a plurality of focused light spots having the same light amount, wherein the optical diffraction grating element includes 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：一种包括光学系统和光学衍射光栅元件和光接收元件的光学系统的光学拾取装置，其中光学衍射光栅元件将从光源发射的光束的0级衍射光导向到将来自记录介质的反射光的一级衍射光引导到光接收元件上，以产生具有相同光量的多个聚焦光点，其中光学衍射光栅元件包括衍射光栅，其衍射光栅具有连续地交替地形成各自位于相邻槽之间的槽和平坦的焊盘，其中衍射光栅具有相同的槽深度，槽宽度和槽倾斜角，以便获得恒定的0级衍射效率和一级衍射效率光学衍射光栅元件，而diffrac的间距通过为每个衍射光栅设置不同的焊盘宽度，使光栅变得不同。

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