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1. 发明授权

US5296989A High density dual gap magnetic head using polar Kerr effect 失效
标题翻译：高密度双间隙磁头采用极性克尔效应
公开(公告)号：US5296989A
公开(公告)日：1994-03-22
申请号：US95339
申请日：1993-07-23
申请人： Yoshitaka Ochiai , Hideki Matsuda , Takehiro Nagaki , Shunichi Hashimoto
发明人： Yoshitaka Ochiai , Hideki Matsuda , Takehiro Nagaki , Shunichi Hashimoto
IPC分类号： G11B11/10 , G11B5/02 , G11B5/127 , G11B11/105 , G11B13/04
CPC分类号： G11B5/1278 , G11B11/10547
摘要： A magnetic head comprising a magnetic path and a vertically magnetizable film. The magnetic path contains a first gap facing a magnetic recording medium and a second gap. The vertically magnetizable film is formed across the second gap on the principal plane or outer circumference of the magnetic path. A linearly polarized light beam is irradiated onto the vertically magnetizable film and the resulting reversal of magnetization in the vertically magnetizable film is detected through the use of a polar Kerr effect. This scheme allows data to be reproduced with sufficient sensitivity from tracks of very small widths.
摘要翻译：一种磁头，包括磁路和可垂直磁化的膜。磁路包含面向磁记录介质和第二间隙的第一间隙。可垂直磁化的膜形成在磁路的主平面或外周上的第二间隙上。线性偏振光束照射到可垂直磁化的膜上，并且通过使用极性克尔效应来检测所产生的可垂直磁化膜中的磁化反转。该方案允许以非常小的宽度的轨道以足够的灵敏度再现数据。

2. 发明授权

US5564194A Geomagnetic direction sensor 失效
标题翻译：地磁方向传感器
公开(公告)号：US5564194A
公开(公告)日：1996-10-15
申请号：US449818
申请日：1995-05-24
申请人： Masayoshi Fujita , Takehiro Nagaki
发明人： Masayoshi Fujita , Takehiro Nagaki
IPC分类号： G01C17/32 , G01C17/28 , G01R33/02 , G01R33/09 , H01L43/12
CPC分类号： G01R33/09 , G01C17/28
摘要： A geomagnetic direction sensor has a substrate, at least two magneto-resistive effect devices and a coil for generating the bias magnetic field. The substrate retains shape symmetry when rotated through 90.degree. and includes plural magnetic cores for converging the geomagnetism. The magnetic cores are arrayed circumferentially of the substrate and interconnected with one another by a non-magnetic material. At least two magneto-resistive effect devices are provided in register with the magnetic gaps so as to be substantially at right angles to one another and to the direction of the magnetic field of the geomagnetism in the magnetic gap region. The substrate also includes a coil for generating a bias magnetic field for impressing a bias magnetic field to each of the magneto-resistive effect devices.
摘要翻译：地磁方向传感器具有衬底，至少两个磁阻效应器件和用于产生偏置磁场的线圈。当旋转90°时，基板保持形状对称，并且包括用于会聚地磁的多个磁芯。磁芯在衬底的周向排列并且通过非磁性材料彼此互连。提供至少两个磁阻效应器件与磁隙对准，以便基本上彼此成直角并且与磁隙区域中的地磁场的方向成一直线。衬底还包括用于产生用于将偏置磁场施加到每个磁阻效应器件的偏置磁场的线圈。

3. 发明授权

US5111441A Apparatus for generating magnetic field varying in response to an information signal 失效
标题翻译：用于在信号信号响应中产生磁场变化的装置
公开(公告)号：US5111441A
公开(公告)日：1992-05-05
申请号：US650607
申请日：1991-02-05
申请人： Hiroshi Eto , Nobuyuki Oka , Takehiro Nagaki
发明人： Hiroshi Eto , Nobuyuki Oka , Takehiro Nagaki
IPC分类号： G11B11/10 , G11B5/02 , G11B11/105 , G11B21/21
CPC分类号： G11B11/10508 , G11B11/10576
摘要： An apparatus for generating a magnetic field varying in response to an information signal, which comprises a base plate made of electrical insulating material, a magnetic core mounted on one of opposite surfaces of the base plate, the magnetic core having a central leg portion extending through a hole formed in the base plate so as to cause its end face to appear on the other of the opposite surfaces of the base plate, a coil member wound on the central leg portion of the magnetic core to be supplied with a current varying in response to the information signal, and a capacitance detecting electrode formed with a thin conductive layer mounted on the other of the opposite surfaces of the base plate to be opposite to a recording medium having a conductive layer, the capacitance detecting electrode being provided with a cutout for restraining eddy current loss caused in the capacitance detecting electrode.

4. 发明授权

US4796241A Device for producing a high frequency modulation magnetic field used in magneto-optical recording 失效
标题翻译：用于制造用于磁光记录的高频调制磁场的装置
公开(公告)号：US4796241A
公开(公告)日：1989-01-03
申请号：US5779
申请日：1987-01-21
申请人： Masatoshi Hayakawa , Takehiro Nagaki , Koichi Aso , Hiroshi Yamanoi
发明人： Masatoshi Hayakawa , Takehiro Nagaki , Koichi Aso , Hiroshi Yamanoi
IPC分类号： G11B11/105 , G11B5/03 , G11B11/12
CPC分类号： G11B11/10532
摘要： A device for producing a high frequency modulating magnetic field is disclosed. The device is especially useful to achieve real-time overwriting in magneto-optical recording. The device produces magnetic field modulated according to a signal to be recorded on a magneto-optical recording medium in which the signal is recorded in the form of magnetization direction on the magneto-optical recording medium under irradiation of a laser beam to raise the temperature of the medium. The device comprises a main magnetic pole formed of a low-loss soft magnetic material and having one end facing to the magnetic-optical recording medium and a sheathed conductor wound around the main magnetic pole and consisting of a parallel connection of a plurality of insulated elementary wires.
摘要翻译：公开了一种用于产生高频调制磁场的装置。该装置对于实现磁光记录中的实时重写特别有用。该装置根据要记录在磁光记录介质上的信号产生磁场调制，其中在激光束照射下在磁光记录介质上以磁化方向的形式记录信号，以提高温度介质。该器件包括由低损耗软磁材料形成的主磁极，其一端面向磁光记录介质，以及缠绕在主磁极上的护套导体，并由多个绝缘元件电线

5. 发明授权

US4524401A Magnetic transducer head utilizing magneto resistance effect with a bias field and partial saturation 失效
标题翻译：磁传感器头利用具有偏置场和部分饱和的磁阻效应
公开(公告)号：US4524401A
公开(公告)日：1985-06-18
申请号：US333423
申请日：1981-12-22
申请人： Hiroyuki Uchida , Takehiro Nagaki , Shigeyoshi Imakoshi , Yutaka Soda , Junkichi Sugita , Tetsuo Sekiya
发明人： Hiroyuki Uchida , Takehiro Nagaki , Shigeyoshi Imakoshi , Yutaka Soda , Junkichi Sugita , Tetsuo Sekiya
IPC分类号： G11B5/39 , G11B5/30
CPC分类号： G11B5/3903
摘要： A magnetic transducer head utilizing a thin film magneto-resistance effect element is disclosed in which the amount of a DC bias magnetic field is so selected that only the end portion of the thin film magneto-resistance effect element serving as a contact surface with a magnetic medium is effectively given with sensitivity and the element is saturated in the vicinity of its central portion in its width direction.
摘要翻译：公开了一种利用薄膜磁阻效应元件的磁转换头，其中直流偏置磁场的量如此选择，使得只有薄膜磁阻效应元件的端部作为具有磁性的接触表面介质有效地被赋予灵敏度，元件在其中心部分的宽度方向附近饱和。

6. 发明授权

US4277808A Magnetic transducer head 失效
标题翻译：磁性换能器头
公开(公告)号：US4277808A
公开(公告)日：1981-07-07
申请号：US41439
申请日：1979-05-22
申请人： Takehiro Nagaki
发明人： Takehiro Nagaki
IPC分类号： G11B5/39 , G11B5/30 , G11B5/12
CPC分类号： G11B5/3903
摘要： A magnetic transducer head having first and second magneto-resistance effect elements, each of which is made of a thin film having the magneto-resistance effect and which are arranged on approximately one line, a current source for flowing currents through the first and second magneto-resistance effect elements, and a bias source for applying bias magnetic fields to the first and second magneto-resistance effect elements. In this case, the bias magnetic field is selected from bias magnetic fields which have the direction of about .+-.(.pi./4).+-.(n/2).pi., where n is an integer, with respect to the currents flowing through the first and second magneto-resistance effect elements, and the current source and the bias source are so connected that when a uniform signal magnetic field is applied to the first and second magneto-resistance effect elements, the resistances thereof are varied in the opposite directions with respect to each other and the outputs from the first and second magneto-resistance effect elements are derived differentially.
摘要翻译：一种磁换能器头，具有第一和第二磁阻效应元件，每个磁阻效应元件由具有磁阻效应的薄膜制成并且被布置在大约一条线上，用于使电流流过第一和第二磁体的电流源电阻效应元件和用于向第一和第二磁阻效应元件施加偏置磁场的偏压源。在这种情况下，偏置磁场从相对于流过的电流的方向为约+/-（π/ 4）+/-（n / 2）pi的偏置磁场选择，其中n为整数通过第一和第二磁阻效应元件，并且电流源和偏置源是连接的，使得当均匀的信号磁场施加到第一和第二磁阻效应元件时，其电阻在相反的方向上变化相互之间的方向和来自第一和第二磁阻效应元件的输出差分地导出。

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