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1. 发明授权

US5490133A Optical information processing apparatus and method of controlling position of optical spot and reproducing signals 失效
标题翻译：光信息处理装置和控制光点位置和再现信号的方法
公开(公告)号：US5490133A
公开(公告)日：1996-02-06
申请号：US772443
申请日：1991-10-07
申请人： Shigeru Nakamura , Mariko Umeda , Takeshi Nakao , Akira Arimoto
发明人： Shigeru Nakamura , Mariko Umeda , Takeshi Nakao , Akira Arimoto
IPC分类号： G11B7/007 , G11B7/09 , G11B7/125 , G11B7/135 , G11B11/105 , G11B7/00
CPC分类号： G11B7/1353 , G11B11/10543 , G11B11/10576 , G11B7/0901 , G11B7/0909 , G11B7/0917 , G11B7/128 , G11B7/1367 , G11B7/13922 , G11B2007/13727 , G11B7/00745 , G11B7/0938 , G11B7/0943
摘要： An optical information processing apparatus comprising a diffraction grating for producing a zero-order beam which is a beam emitted by a light source and allowed to pass therethrough and two plus and minus first-order sub-beams respectively having positive and negative astigmatisms, radiated in directions at slight angles different from the main beam, wherein said two sub-beams are focused at opposite positions across said main beam, wherein focusing control is performed by a focusing error signal detected from a difference of signal amplitudes obtained from the respective reflected light quantities of said two sub-beams and wherein tracking control is performed by an off-track signal obtained from a signal according to a reflected light quantity of said main beam. In an apparatus for magneto-optically reproducing information, above all else, a wave plate is inserted between the focusing lens and the separating optical system, thereby increasing the reflected light quantities and stabilizing the magneto-optical signal, focusing signal and tracking signal.
摘要翻译：一种光学信息处理设备，包括用于产生零光束的衍射光栅，该光束是由光源发射并允许通过的光束，以及分别具有正和负散光的两个正负子像素，辐射在方向以与主波束不同的微小角度，其中所述两个子波束聚焦在穿过所述主波束的相对位置，其中聚焦控制由通过从各反射光量获得的信号幅度差检测的聚焦误差信号来执行的所述两个子光束，并且其中跟踪控制由根据所述主光束的反射光量从信号获得的偏离轨道信号执行。在用于磁光再现信息的装置中，首先，在聚焦透镜和分离光学系统之间插入波片，由此增加反射光量并稳定磁光信号，聚焦信号和跟踪信号。

2. 发明授权

US5361244A Optical head and information recording apparatus 失效
标题翻译：光头和信息记录装置
公开(公告)号：US5361244A
公开(公告)日：1994-11-01
申请号：US865114
申请日：1992-04-08
申请人： Shigeru Nakamura , Akira Arimoto , Takeshi Nakao , Mariko Umeda
发明人： Shigeru Nakamura , Akira Arimoto , Takeshi Nakao , Mariko Umeda
IPC分类号： G11B7/09 , G11B7/135 , G11B7/22 , H01S5/022 , G11B7/00
CPC分类号： G11B7/1353 , G11B7/0909 , G11B7/22 , H01S5/02248 , H01S5/02288 , H01S5/02296 , H01S5/0683
摘要： Disclosed herein is a compact, adjustment-free, unitary optical head wherein diffraction grating made of a birefrigence material and having convexities and concavities of grating grooves so set that the difference of their optical path lengths is some multiples and a half of the wavelength for an ordinary beam and an extraordinary beam, a diffraction grating providing astigmatisms to .+-.1 order beams, a quarter wavelength plate, and other optical components, are interposed between a semiconductor laser and a focussing lens and are stored inside an optical head body filled with a dry nitrogen gas. A focus error detection signal is obtained from the difference of the degrees of modulation of the .+-.1 order reflected beams by pre-wobbled pits, and adjustment of the optical beam can be carried out by driving the body by a two-directional head actuator.
摘要翻译：本文公开了一种紧凑的，无调节的单一光学头，其中衍射光栅由双折射材料制成并且具有如此设置的光栅槽的凸起和凹陷，使得它们的光程长度的差是波长的一半的一半普通光束和非常光束，向+/- 1阶光束，四分之一波长板和其他光学部件提供散光的衍射光栅插入在半导体激光器和聚焦透镜之间，并且被存储在填充有干燥氮气。根据预摆动凹坑的+/- 1级反射光束的调制度的差异获得聚焦误差检测信号，光束的调节可以通过双向头部的驱动来进行执行器。

3. 发明授权

US5404344A Recording/reproducing optical head producing focusing error signal from zero-th order diffracted light and tracking error signal from first order diffracted light 失效
$Recording/reproducing optical head producing focusing error signal from zero-th order diffracted light and tracking error signal from first order diffracted light$
标题翻译：从零级衍射光产生聚焦误差信号的记录/再现光头和来自一级衍射光的跟踪误差信号
公开(公告)号：US5404344A
公开(公告)日：1995-04-04
申请号：US154482
申请日：1993-11-19
申请人： Nobuo Imada , Kunikazu Ohnishi , Tohru Sasaki , Masayuki Inoue , Akira Arimoto , Shigeru Nakamura , Takeshi Nakao
发明人： Nobuo Imada , Kunikazu Ohnishi , Tohru Sasaki , Masayuki Inoue , Akira Arimoto , Shigeru Nakamura , Takeshi Nakao
IPC分类号： G11B7/09 , G11B7/13 , G11B7/135 , G11B11/10 , G11B11/105 , G11B7/00
CPC分类号： G11B7/09 , G11B7/131 , G11B7/1353
摘要： A recording/reproducing optical head capable of causing a light spot on a photodetector for detecting a focusing error signal to stand still without being affected by variations in wavelength of light used, capable of adjusting a tracking error signal independently of the focusing error signal, and capable of utilizing light having an order of diffraction of -1 for the purpose of detecting a signal, in which a cylindrical lens for generating astigmatism and a diffraction grating made up of two regions different in the direction of diffraction or the angle of diffraction from each other are interposed between a beam splitter and a photodetector, a light beam diffracted from the diffraction grating and including the diffracted light of the zero-th order (that is, light which has passed through the diffraction grating without being deflected) is received by the photodetector, the diffracted light of the zero-th order is used for detecting a focusing error signal according to the astigmatism method, and diffracted light having an order of diffraction of +1 and diffracted light having an order of diffraction of -1 are used for detecting a tracking error signal.
摘要翻译：一种记录/再现光学头，其能够使光检测器上的光点用于检测聚焦误差信号静止而不受所用光波长的变化的影响，能够独立于聚焦误差信号调整跟踪误差信号;以及能够利用衍射次数为-1的光来检测信号，其中用于产生像散的柱面透镜和衍射光栅由衍射方向不同的两个区域或每个衍射方向衍射的角度构成另外设置在分束器和光电检测器之间，从衍射光栅衍射的光束并且包括零级的衍射光（即，已经通过衍射光栅而不被偏转的光）被光电检测器，零级的衍射光用于根据散光检测聚焦误差信号 sm方法，衍射次数为+1的衍射光和衍射级数为-1的衍射光用于检测跟踪误差信号。

4. 发明授权

US5315573A Non-linear optical saturable absorber layer in an optical disk to discriminate wavelength above or below a threshold level of intensity 失效
标题翻译：在光盘中的非线性光可饱和吸收层，以将波长区分为高于或低于阈值强度水平
公开(公告)号：US5315573A
公开(公告)日：1994-05-24
申请号：US922375
申请日：1992-07-31
申请人： Takeshi Nakao , Akira Arimoto , Kensuke Ogawa , Hirofumi Sukeda , Hisataka Sugiyama
发明人： Takeshi Nakao , Akira Arimoto , Kensuke Ogawa , Hirofumi Sukeda , Hisataka Sugiyama
IPC分类号： G11B7/005 , G11B7/12 , G11B7/24
CPC分类号： G11B7/24 , G11B7/005 , G11B7/12 , Y10S430/146
摘要： An information recording medium for suppressing the interferences of bits before and after reproduction and improving the optical resolution with saturable absorber 102 disposed adjacent or in an information recording medium layer 103. The recorded information is detected only from a region having a predetermined optical intensity or more of the focused spot so that minute information bits smaller than the optical resolution can be reproduced to improve the recording density of an optical disk drive drastically.
摘要翻译：一种信息记录介质，用于抑制在再现之前和之后的比特的干扰，并提高与信息记录介质层103相邻或在信息记录介质层103中设置的可饱和吸收体102的光学分辨率。所记录的信息仅从具有预定光强度或更大的区域检测的聚焦点，使得可以再现小于光学分辨率的微小信息比特，以提高光盘驱动器的记录密度。

5. 发明授权

US5930220A Tracking method for optical disk apparatus using diffraction light 失效
$Tracking method for optical disk apparatus using diffraction light$
标题翻译：使用衍射光的光盘装置的跟踪方法
公开(公告)号：US5930220A
公开(公告)日：1999-07-27
申请号：US770075
申请日：1996-12-19
申请人： Takeshi Shimano , Akira Arimoto , Takeshi Nakao , Masayuki Inoue , Kunikazu Ohnishi , Yoshio Suzuki
发明人： Takeshi Shimano , Akira Arimoto , Takeshi Nakao , Masayuki Inoue , Kunikazu Ohnishi , Yoshio Suzuki
IPC分类号： G11B7/00 , G11B7/09 , G11B7/13 , G11B7/135
CPC分类号： G11B7/1353 , G11B7/094 , G11B7/131 , G11B2007/0006 , G11B7/0901 , G11B7/0909
摘要： In an optical head, light from a semiconductor laser is directed through a condensing optical system with a condensing lens onto an optical information recording medium through a transparent substrate in the form of a light spot. A unit for producing a light spot position control signal and a unit able to move the light spot, which supports the objective lens for movement, position the light spot on an information track. Light reflected from the optical information recording medium is directed through a polarized light branching element to a photo detector. Also mounted for movement with the objective lens are a polarization conversion element, arranged between the optical information recording medium and the polarized light branching element in order to change the polarization state of light incident to the optical information recording medium and reflected therefrom and a polarization diffraction grating, the diffraction efficiency of which changes depending on the change in the polarization state of the incident light and the reflected light caused by the polarization conversion element. The light spot control signal is detected from both reflected light diffracted through the polarization diffraction grating and non-diffracted reflected light contained in the light which passes through the polarized light branching element.
摘要翻译：在光头中，来自半导体激光器的光通过具有聚光透镜的聚光系统通过光点形式的透明基板引导到光信息记录介质上。用于产生光点位置控制信号的单元和能够移动支持物镜移动的光点的单元将光斑定位在信息轨道上。从光信息记录介质反射的光通过偏振光分支元件被引导到光检测器。为了使入射到光信息记录介质的光的偏振状态改变并反射，偏振转换元件也安装在光学信息记录介质和偏振光分支元件之间，并且偏振衍射元件光栅，其衍射效率根据入射光的偏振态和由偏振转换元件引起的反射光的变化而变化。从通过偏振衍射光栅衍射的反射光和通过偏振光分支元件的光中包含的非衍射反射光检测光点控制信号。

6. 发明授权

US5270987A Magneto-optical recording and reproducing method, magneto-optical memory apparatus and magneto-optical recording medium therefor 失效
标题翻译：磁光记录和再现方法，磁光存储装置及其磁光记录介质
公开(公告)号：US5270987A
公开(公告)日：1993-12-14
申请号：US509743
申请日：1990-04-17
申请人： Toshimitsu Kaku , Shigeru Nakamura , Masahiko Takahashi , Toshio Niihara , Harukazu Miyamoto , Norio Ohta , Takeshi Nakao , Hirofumi Sukeda , Masahiro Ojima , Takashi Toyooka , Tsuneo Suganuma , Fumiyoshi Kirino , Yoshinori Miyamura
发明人： Toshimitsu Kaku , Shigeru Nakamura , Masahiko Takahashi , Toshio Niihara , Harukazu Miyamoto , Norio Ohta , Takeshi Nakao , Hirofumi Sukeda , Masahiro Ojima , Takashi Toyooka , Tsuneo Suganuma , Fumiyoshi Kirino , Yoshinori Miyamura
IPC分类号： G11B11/105 , G11B11/00
CPC分类号： G11B11/10584 , G11B11/10536 , G11B11/10545 , G11B11/10552 , G11B11/10558 , G11B11/10593 , G11B11/10571
摘要： A magnetic field of a polarity corresponding to information to be recorded is applied while a recording spot having a high energy is irradiated to a magneto-optical recording medium to record domains representing the information along a track. The recorded domains are read out by a reproducing spot having a lower energy than the recording spot and a high resolution power along the track. A recording head has an optical system for irradiating the recording spot having the high energy to the magneto-optical recording medium and a magnetic head for applying a magnetic field having a polarity thereof switched in accordance with the information to be recorded, to an irradiation area of the recording spot, a reproducing head has an optical system for irradiating the reproducing spot having the low energy by a laser beam having a wavelength of no larger than 600 nm and a magneto-optical signal detector for detecting a displacement of a polarization plane of a reflected light of the reproducing spot to read out the recording domains. The magneto-optical recording medium is made of a recording film having a multi-layer structure of alternate lamination of metal layers and dielectric layers.
摘要翻译：将具有高能量的记录点照射到磁光记录介质上，记录与记录信息对应的极性的磁场，记录表示信息沿着轨迹的域。记录的区域由具有比记录点更低的能量的再现点和沿着轨道的高分辨率电力读出。记录头具有用于向磁光记录介质照射具有高能量的记录点的光学系统和用于根据要记录的信息将其极性切换的磁场施加到照射区域的记录点，再现头具有用于通过具有不大于600nm的波长的激光束照射具有低能量的再现点的光学系统和用于检测偏振面的位移的磁光信号检测器再现点的反射光读出记录区域。磁光记录介质由具有金属层和电介质层的交替叠层的多层结构的记录膜制成。

7. 发明授权

US4901325A Semiconductor laser device 失效
标题翻译：半导体激光器件
公开(公告)号：US4901325A
公开(公告)日：1990-02-13
申请号：US173658
申请日：1988-03-25
申请人： Takeshi Kato , Kenichi Mizuishi , Katuaki Chiba , Takeshi Nakao , Masahiro Ojima , Shigeru Nakamura , Takeshi Maeda
发明人： Takeshi Kato , Kenichi Mizuishi , Katuaki Chiba , Takeshi Nakao , Masahiro Ojima , Shigeru Nakamura , Takeshi Maeda
IPC分类号： G11B7/125 , H01S5/022 , H01S5/024 , H01S5/40
CPC分类号： H01S5/02212 , G11B7/127 , H01S5/024 , H01S5/4025 , H01S5/02288
摘要： A semiconductor laser device utilizing at least a pair of semiconductor laser chips; and a fixing device for fixing the semiconductor laser chips so that electrode surfaces are approximately parallel and opposite to each other and the interval between light emitting spots of the semiconductor laser chips is small.
摘要翻译：一种利用至少一对半导体激光芯片的半导体激光器件; 以及用于固定半导体激光器芯片使得电极表面彼此大致平行且相反并且半导体激光器芯片的发光点之间的间隔小的定影装置。

8. 发明授权

US06272097B1 Optical head and apparatus for recording and reproducing optical information through the use of the optical head 失效
标题翻译：用于通过使用光学头来记录和再现光学信息的光学头和设备
公开(公告)号：US06272097B1
公开(公告)日：2001-08-07
申请号：US09313211
申请日：1999-05-18
申请人： Takeshi Nakao , Shigeru Nakamura , Toshiaki Tanaka , Takeshi Shimano
发明人： Takeshi Nakao , Shigeru Nakamura , Toshiaki Tanaka , Takeshi Shimano
IPC分类号： G11B725
CPC分类号： G11B7/1365 , G11B7/122 , G11B7/124 , G11B7/1372 , G11B7/22 , G11B11/1058
摘要： A minute optical head is provided so that a light source and one or more photo detector elements are integrated on the same substrate by a simple manufacturing process and may be applied to an apparatus for recording and reproducing recordable optical information. An apparatus for recording and reproducing optical information is arranged to have a minute optical head. A light waveguide layer composed of column semiconductor crystal is formed on a monocrystalline transparent substrate and an active layer is formed on the side of the light waveguide layer. The light beam source is a semiconductor having a vertical resonator formed of a high-reflection film before and after an emitting surface of the active layer so that a light beam is vertically radiated to the substrate. The photo detector element is integrated on the closer portion of the substrate to the light beam source of the semiconductor laser. Further, on the opposed surface of the substrate to the light beam source are sequentially integrated a first transparent layer, a diffraction grating, a second transparent layer, a phase difference generating element, a third transparent layer, a light beam focusing element, a fourth transparent layer, and a slide-resisting protective layer. The slide-resisting protective layer is located closer to and as opposed to the information recording medium.
摘要翻译：提供一个微小的光学头，使得光源和一个或多个光电检测器元件通过简单的制造工艺集成在同一基板上，并且可以应用于用于记录和再现可记录光学信息的装置。用于记录和再现光学信息的设备被布置成具有微小的光学头。在单晶透明基板上形成由柱半导体晶体构成的光波导层，在光波导层一侧形成有源层。光束源是在有源层的发射表面之前和之后具有由高反射膜形成的垂直谐振器的半导体，使得光束垂直辐射到衬底。光检测器元件集成在基板的更靠近部分上的半导体激光器的光束源上。此外，在与光束源的基板相对的表面上依次地集成有第一透明层，衍射光栅，第二透明层，相位差产生元件，第三透明层，光束聚焦元件，第四透明层透明层和耐滑动保护层。防滑保护层位于信息记录介质的更靠近和相对的位置。

9. 发明授权

US5016234A Two-laser collimated beam optical head with monitor 失效
标题翻译：双激光准直光束头带显示器
公开(公告)号：US5016234A
公开(公告)日：1991-05-14
申请号：US209982
申请日：1988-06-22
申请人： Shigeru Nakamura , Sadatsugi Machida , Takeshi Nakao , Masahiro Ojima
发明人： Shigeru Nakamura , Sadatsugi Machida , Takeshi Nakao , Masahiro Ojima
IPC分类号： G11B7/00 , G11B7/003 , G11B7/004 , G11B7/125 , G11B7/135
CPC分类号： G11B7/1356
摘要： In a two-laser beam optical head including first and second signal detectors for guiding emitting beams from first and second laser sources as two spots to an information medium and detecting the reflected beams from the two spots, the optical head of the present invention has the construction wherein the two laser sources are stored in one package, the emitting beams from two laser sources can be rotated together with a collimate lens with the optical axis of the collimate lens being the center in order to enable the two spots around the optical axis of a focusing lens as the center and the direction of the center line between the two spots can be changed so that the center line between the two spots is always perpendicular to the radial direction of the track on the information medium. The optical head includes further first and second radiating light power optical detectors for detecting the radiating light power of the first and second laser sources, whereby the second signal detector and at least one of the first and second radiating light power optical detector are constituted by one divided optical detector.
摘要翻译：在包括第一和第二信号检测器的双激光束光头中，第一和第二信号检测器用于将来自第一和第二激光源的光束作为两个点引导到信息介质并检测来自两个光点的反射光束，本发明的光头具有其中两个激光源存储在一个封装中，来自两个激光源的发射光束可以与准直透镜一起旋转，其中准直透镜的光轴为中心，以便能够使光轴周围的两个点可以改变作为中心的聚焦透镜和两个光点之间的中心线的方向，使得两个光点之间的中心线总是垂直于信息介质上的光道的径向方向。光头包括用于检测第一和第二激光源的辐射光功率的另外的第一和第二辐射光功率光检测器，由此第二信号检测器和第一和第二辐射光功率光检测器中的至少一个由一个分光检测器。

10. 发明授权

US5235591A Stack type optical disc apparatus, sealed and separate type optical head therefor and optical disc medium 失效
标题翻译：堆叠式光盘装置，密封分离型光头及光盘介质
公开(公告)号：US5235591A
公开(公告)日：1993-08-10
申请号：US641309
申请日：1991-01-15
申请人： Shigeru Nakamura , Eiichi Seya , Seiichi Mita , Masuo Kasai , Masahiro Ojima , Hiroshi Yasuoka , Motoyasu Terao , Yoshinori Miyamura , Takeshi Nakao , Kiyoshi Matsumoto , Yoshihiro Hamakawa
发明人： Shigeru Nakamura , Eiichi Seya , Seiichi Mita , Masuo Kasai , Masahiro Ojima , Hiroshi Yasuoka , Motoyasu Terao , Yoshinori Miyamura , Takeshi Nakao , Kiyoshi Matsumoto , Yoshihiro Hamakawa
IPC分类号： G11B7/12 , G11B7/14 , G11B33/14
CPC分类号： G11B7/14 , G11B33/14 , G11B7/122
摘要： A separation type optical head according to the present invention includes at least a light source portion for emitting collimated beams, a focusing device (a focusing lens) for focusing the collimated beams onto an information recording surface of an optical disc medium, a focal point control mechanism for the position of the spot on the information recording surface, and a photo-detection portion for receiving beams reflected by the information recording surface. The structure is divided into a fixed portion including the light source portion and the photo-detection portion and a movable portion including the focusing device (focusing lens) and the focal point control mechanism. At least the movable portion of the separation type optical head is movably accommodated n a frame (sealing case) for the optical head so as to prevent irregular vibrations of the movable portion due to high speed air flows or turbulence. Furthermore, a focal point control mechanism of an air float type may be employed in the movable portion of the separation type optical head so as to actively utilize the high speed air flow generated due to the rotation of the disc medium to perform a rough adjustment of the focal point of the focusing device.
摘要翻译：根据本发明的分离型光学头至少包括用于发射准直光束的光源部分，用于将准直光束聚焦到光盘介质的信息记录表面上的聚焦装置（聚焦透镜），焦点控制在信息记录表面上的位置的机构，以及用于接收由信息记录表面反射的光束的光检测部分。该结构被分为包括光源部分和光检测部分的固定部分和包括聚焦装置（聚焦透镜）和焦点控制机构的可动部分。至少分离型光学头的可移动部分可移动地容纳在用于光学头的框架（密封壳体）中，以防止由于高速空气流动或湍流引起的可移动部分的不规则振动。此外，可以在分离型光学头的可动部分中采用气浮式的焦点控制机构，以便主动地利用由于盘介质的旋转而产生的高速气流来进行粗略调整聚焦装置的焦点。

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