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81. 发明授权

US4409526A Brushless DC motor 失效
标题翻译：无刷直流电机
公开(公告)号：US4409526A
公开(公告)日：1983-10-11
申请号：US209145
申请日：1980-11-21
申请人： Hiroyuki Yamauchi , Tamotsu Yamagami
发明人： Hiroyuki Yamauchi , Tamotsu Yamagami
IPC分类号： H02P6/08 , H02K29/00
CPC分类号： H02P6/085
摘要： A brushless DC motor having a rotor magnet magnetized to provide a sinusoidal magnetic field and two-phase stator windings at positions which differ from each other by an electrical angle which is an odd multiple of 90.degree. is provided with a drive circuit comprising a signal generator with an output having a frequency determined by the rotational speed of the rotor, and a memory having stored therein digital information data converted from sampled values of a sinusoidal signal free of distortion. The digital information data stored in the memory is read out therefrom by the output of the signal generator in synchronism with the magnetic field from the rotor magnet, and such read-out information data is employed to determine currents flowing through the stator windings so that torque ripple is substantially eliminated.
摘要翻译：具有被磁化以在彼此不同的电角度为90度的奇数倍的位置处提供正弦磁场和两相定子绕组的转子磁体的无刷直流电动机设置有包括信号发生器的驱动电路输出具有由转子的旋转速度确定的频率，以及存储器，其中存储有从没有失真的正弦信号的采样值转换的数字信息数据。存储在存储器中的数字信息数据通过信号发生器的输出与来自转子磁体的磁场同步地读出，并且使用这种读出信息数据来确定流过定子绕组的电流，使得转矩纹波基本消除。

82. 发明申请

US20050169158A1 Optical recording medium and playback method for the same 有权
标题翻译：光记录介质和播放方法相同
公开(公告)号：US20050169158A1
公开(公告)日：2005-08-04
申请号：US10504292
申请日：2003-02-10
申请人： Shinya Abe , Shin-ichi Tanaka , Hiroshi Ogawa , Jacobus Petrus Heemskerk , Tamotsu Yamagami , Cornelis Schep
发明人： Shinya Abe , Shin-ichi Tanaka , Hiroshi Ogawa , Jacobus Petrus Heemskerk , Tamotsu Yamagami , Cornelis Schep
IPC分类号： G11B7/005 , G11B7/007 , G11B7/243 , G11B20/00 , G11B20/12 , G11B20/14 , G11B23/00 , G11B23/28 , G11B23/30 , G11B7/24
CPC分类号： G11B23/284 , G11B7/0053 , G11B7/00736 , G11B7/24079 , G11B20/00086 , G11B20/1217 , G11B20/1403 , G11B23/0042 , G11B23/30 , G11B2020/122 , G11B2020/1238 , G11B2020/1277 , G11B2220/2537
摘要： An optical disc or other optical recording medium enables reading barcode-shaped-BCA marks in a burst cutting area (BCA) with tracking on while making tampering with the BCA marks difficult. The optical disc 100 has a first area 102 containing tracks at a first track pitch d2, and a second area 101 containing tracks at a second track pitch d1. The barcode-shaped marks 104 are recorded in the second area, and the second track pitch is wider than the first track pitch.
摘要翻译：光盘或其它光学记录介质能够在具有追踪功能的突发切割区域（BCA）中读取条形码形BCA标记，同时难以篡改BCA标记。光盘100具有包含第一轨道间距d 2的轨道的第一区域102和包含第二轨道间距d 1的轨道的第二区域101。条形码标记104被记录在第二区域中，并且第二轨道间距比第一轨道间距宽。

83. 发明授权

US5896355A Data recording/reproducing apparatus corresponding to a plurality of error correcting system and a data recording medium 失效
公开(公告)号：US5896355A
公开(公告)日：1999-04-20
申请号：US647643
申请日：1996-05-15
申请人： Yoichiro Sako , Tamotsu Yamagami
发明人： Yoichiro Sako , Tamotsu Yamagami
IPC分类号： G11B20/12 , G11B20/18 , H03M13/00 , G11B7/00
CPC分类号： G11B20/1866 , G11B20/1217
摘要： A data recording apparatus for recording digital data to a data recording medium is disclosed, that comprises an error correction code encoding means for interleaving a predetermined unit of data to be recorded and encoding the resultant data with an error correction code, and an identifying means for identifying whether the data to be recorded is reproduction-only data or rewritable data, wherein said error correction code encoding means is adapted for changing the interleave length corresponding to the output of said identifying means.

84. 发明授权

US5784343A Magneto-optical recording and/or reproducing apparatus having a plurality of optical systems 失效
标题翻译：具有多个光学系统的磁光记录和/或再现装置
公开(公告)号：US5784343A
公开(公告)日：1998-07-21
申请号：US761755
申请日：1991-09-16
申请人： Tetsu Watanabe , Tamotsu Yamagami
发明人： Tetsu Watanabe , Tamotsu Yamagami
IPC分类号： G11B11/10 , G11B7/135 , G11B11/105 , G11B11/14 , G11B13/04
CPC分类号： G11B11/10532 , G11B11/10552 , G11B11/10584 , G11B11/10597
摘要： A magneto-optical recording and/or reproducing apparatus having a magnetic head and first and second optical systems for recording on and/or reproducing from first and second magneto-optical media. The first optical system has a first objective lens, and the second optical system has a second objective lens whose numerical aperture differs from that of the first objective lens. The magnetic head is arranged near the second objective lens. The first and second optical systems are arranged such that the respective one of the first and second magneto-optical media which is currently being subject to recording or reproducing is positioned between the first and second optical systems.
摘要翻译： PCT No.PCT / JP91 / 00112 Sec。 371日期1991年9月16日 102（e）1991年9月16日PCT 1991年1月30日PCT PCT。公开号WO91 / 11806 日期1991年8月8日一种具有磁头和用于在第一和第二磁光介质上记录和/或再现的第一和第二光学系统的磁光记录和/或再现装置。第一光学系统具有第一物镜，第二光学系统具有与第一物镜的数值孔径不同的第二物镜。磁头布置在第二物镜附近。第一和第二光学系统被布置成使得当前正在进行记录或再现的第一和第二磁光介质中的相应一个位于第一和第二光学系统之间。

85. 发明授权

US5497367A Optical recording medium 失效
标题翻译：光记录介质
公开(公告)号：US5497367A
公开(公告)日：1996-03-05
申请号：US939031
申请日：1992-09-01
申请人： Tamotsu Yamagami , Yoichiro Sako
发明人： Tamotsu Yamagami , Yoichiro Sako
IPC分类号： G11B11/10 , G11B7/00 , G11B7/007 , G11B7/09 , G11B7/24 , G11B7/30 , G11B11/105 , G11B13/04 , G11B20/12 , G11B27/19 , G11B27/30
CPC分类号： G11B7/24082 , G11B11/10584 , G11B13/04 , G11B27/19 , G11B27/3027 , G11B7/007 , G11B7/0079 , G11B7/0938 , G11B2020/1259
摘要： An optical storage medium provided with both a read-write area in which read-write data can be rewritably stored and a read-only area in which read-write data is previously stored in an unerasable manner. In the read-write area, a guide track is previously formed for tracking control, and read-write data is rewritably stored, for example photomagnetically, along the guide track. In the read-only area, data is stored along a read-only track that is offset over a portion of its length in a direction lateral to the track direction to represent the read-only data. This read-only data may be reproduced by detecting the laser light radiated from an optical pickup and reflected by the medium by a two-segment photodetector.
摘要翻译：一种光存储介质，其具有可读写数据可重写存储的读写区和其中以不可擦除的方式预先存储读写数据的只读区。在读写区域中，预先形成用于跟踪控制的导轨，并且读写数据例如沿光导方向可重写地存储在导轨上。在只读区域中，数据沿着只读磁道存储，该只读磁道在沿磁道方向横向的方向上偏移其长度的一部分，以表示只读数据。该只读数据可以通过检测从光学拾取器辐射并由介质由两段光电探测器反射的激光来再现。

86. 发明授权

US5488590A Magneto-optical overwrite recording and reproducing system 失效
标题翻译：磁光覆盖记录和再现系统
公开(公告)号：US5488590A
公开(公告)日：1996-01-30
申请号：US301045
申请日：1994-09-06
申请人： Tetsu Watanabe , Tamotsu Yamagami
发明人： Tetsu Watanabe , Tamotsu Yamagami
IPC分类号： G11B11/10 , G11B11/105 , G11B7/00 , G11B11/00
CPC分类号： G11B11/10513 , G11B11/10515 , G11B11/10528 , G11B11/10584 , G11B11/10576
摘要： A magneto-optical recording and reproducing system in a magneto-optical disk capable of being overwrite recorded by applying a magnetic field to a photo-sensitive recording layer and irradiating a laser beam onto the recording layer. A track pitch and a diameter of the laser beam are set so that recording tracks to be formed by irradiation of the laser beam overlap, each other between adjacent tracks. Accordingly, data recording density of the magneto-optical disk, especially in a radial direction thereof, can be increased.
摘要翻译：能够通过向光敏记录层施加磁场并且将激光照射到记录层上而能够重写的磁光盘中的磁光记录和再现系统。激光束的轨道间距和直径被设定为使得通过激光束的照射形成的记录轨迹彼此重叠在相邻轨道之间。因此，可以增加磁光盘的数据记录密度，特别是在其径向方向上的数据记录密度。

87. 发明授权

US5363352A Magneto-optic disk apparatus 失效
标题翻译：磁光盘装置
公开(公告)号：US5363352A
公开(公告)日：1994-11-08
申请号：US14112
申请日：1993-02-05
申请人： Minoru Tobita , Tamotsu Yamagami
发明人： Minoru Tobita , Tamotsu Yamagami
IPC分类号： G11B11/10 , G11B11/105 , G11B20/10 , G11B20/12 , G11B20/18 , G11B11/00
CPC分类号： G11B20/10083 , G11B11/10515 , G11B11/10517 , G11B20/10009 , G11B20/1258 , G11B11/1051
摘要： A magneto-optic disk apparatus is disclosed which can reproduce data well from a magneto-optic disk on which the data are reproduced in a high density with an increased line density. Recording data are converted into NRZI data by a pre-encoder and recorded onto a magneto-optic disk using a magnetic field modulating method while irradiating a laser beam intermittently upon the disk. A reproduced radio frequency signal from the disk is clamped for each segment by a clamp circuit, converted into a digital signal by an analog to digital converter, waveform equalized by an equalizer so that it may be approximated to the waveform of a cosine filter suitable for partial response PR(1, 1), and supplied to a data detection circuit. The data detection circuit detects data using the viterbi algorithm to obtain reproduced data in the form of NRZ data. Since the partial response PR(1, 1) in which inter symbol interference is used positively is applied, even if the line density is raised to achieve high density recording, a sufficient phase margin can be assured. Since viterbi decoding is applied, the S/N ratio is enhanced to reduce the code error rate.
摘要翻译：公开了一种磁光盘装置，其可以从其中数据以高密度再现的磁光盘良好地再现数据，并且线密度增加。通过预编码器将记录数据转换成NRZI数据，并且使用磁场调制方法在光盘上间歇地照射激光束时将其记录在磁光盘上。来自盘的再现的射频信号通过钳位电路针对每个段被钳位，由模数转换器转换为数字信号，由均衡器均衡的波形，使得其可以近似为适合于部分响应PR（1,1），并被提供给数据检测电路。数据检测电路使用维特比算法检测数据，以获得NRZ数据形式的再现数据。由于使用其中使用符号间干扰的部分响应PR（1,1），即使线密度升高以实现高密度记录，也可以确保足够的相位裕度。由于应用了维特比解码，因此增强了S / N比以降低码错误率。

88. 发明授权

US5297125A Optical recording medium and information recording apparatus for recording bursts of low-pass filtered reproduce-only information in a wobbling pre-groove on the optical recording medium 失效
标题翻译：光记录介质和信息记录装置，用于在光记录介质上的摆动预制槽中记录低通滤波再现信息的脉冲串
公开(公告)号：US5297125A
公开(公告)日：1994-03-22
申请号：US951021
申请日：1992-10-13
申请人： Tamotsu Yamagami , Yoichiro Sako
发明人： Tamotsu Yamagami , Yoichiro Sako
IPC分类号： G11B7/007 , G11B7/09 , G11B7/26 , G11B11/105 , G11B27/19 , G11B27/24 , G11B7/00
CPC分类号： G11B7/261 , G11B11/10576 , G11B11/10578 , G11B27/19 , G11B27/24 , G11B7/0904 , G11B7/24082 , G11B2220/213 , G11B2220/2525 , G11B2220/2545
摘要： The present invention is concerned with a recording medium wherein, in a recording medium in which the information may be regenerated optically, a track is pre-recorded or pre-formatted by being deviated along the track width with a signal which the baseband signal of a read-only information signal freed of high-frequency components. The present invention is also concerned with a recording apparatus for forming a track of an optical recording medium from which an information can be reproduced optically, wherein the apparatus includes a deviating device for deviating a track-forming recording beam along the width of the track of the optical recording medium, a deviation control signal generating device for generating deviation control baseband signals for controlling the deviation device, and a low-pass filter for eliminating the high-frequency components of the deviation control baseband signals.
摘要翻译：本发明涉及一种记录介质，其中在其中可以光学地再现信息的记录介质中，通过沿着轨道宽度偏移的轨迹被预先记录或预格式化，其中信号是只读信息信号释放高频分量。本发明还涉及一种用于形成光学记录介质的轨道的记录装置，从该记录介质的轨道可以光学地再现信息，其中该装置包括一个偏离装置，用于使轨道形成记录光束沿轨道的宽度偏离光记录介质，用于产生用于控制偏差装置的偏差控制基带信号的偏差控制信号产生装置和用于消除偏差控制基带信号的高频分量的低通滤波器。

89. 发明授权

US5287334A Magneto-optical pickup apparatus and magneto-optical recording/reproducing apparatus 失效
标题翻译：磁光拾取装置和磁光记录/再现装置
公开(公告)号：US5287334A
公开(公告)日：1994-02-15
申请号：US808077
申请日：1991-12-11
申请人： Kietsu Iwabuchi , Koji Sasaki , Tetsu Watanabe , Tamotsu Yamagami , Yoshio Aoki
发明人： Kietsu Iwabuchi , Koji Sasaki , Tetsu Watanabe , Tamotsu Yamagami , Yoshio Aoki
IPC分类号： G11B11/105 , G11B5/127
CPC分类号： G11B11/10584 , G11B11/10532 , G11B11/10536 , G11B11/10554
摘要： A magneto-optical pickup apparatus includes an objective lens for focusing a laser beam emitted from a laser device onto a magneto-optical recording medium, driving coils, on which the objective lens is mounted, for driving the objective lens in focusing and tracking directions, and a plate arranged at an end portion of the driving coils between the objective lens and the magneto-optical recording medium. The plate is formed with a coil pattern for generating a magnetic field to be applied to the magneto-optical recording medium, and can allow a laser beam transmitted through the objective lens to pass therethrough.
摘要翻译：磁光拾取装置包括用于将从激光装置发射的激光束聚焦到磁光记录介质上的物镜，其上安装有物镜的驱动线圈，用于在聚焦和跟踪方向上驱动物镜，以及布置在物镜和磁光记录介质之间的驱动线圈的端部处的板。板形成有用于产生要施加到磁光记录介质的磁场的线圈图案，并且可以允许透过物镜的激光束通过。

90. 发明授权

US5200935A Recording apparatus using magneto-optical effect including control means for inhibiting energizing of the light beam generating means in responsive to coded data 失效
标题翻译：使用磁光效应的记录装置，包括抑制光束产生装置对编码数据的响应的控制手段
公开(公告)号：US5200935A
公开(公告)日：1993-04-06
申请号：US608744
申请日：1990-11-05
申请人： Tetsu Watanabe , Tamotsu Yamagami
发明人： Tetsu Watanabe , Tamotsu Yamagami
IPC分类号： G11B11/10 , G11B11/105
CPC分类号： G11B11/10513 , G11B11/1053
摘要： In a recording apparatus employing a magneto-optical effect, and in which a light beam irradiates a region of a magneto-optical disc while a magnetic field acts on the disc at such region and is modulated by coded data in accordance with a predetermined modulation system; the light beam is intermittently energized by drive pulses, and the energizing of the light beam is inhibited at times corresponding to transitions in the coded data when the ratio Tmin/Tw is greater than 1, in which Tmin is the minimum length between transitions in the coded data and Tw is a window margin for the modulation system employed for modulating the magnetic field.

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