Patents by Inventor Tatsuya Fukami
Tatsuya Fukami has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20020153881Abstract: A magnetic field sensing element comprises an underlayer formed on a substrate, a giant magnetoresistance element formed on the underlayer for detecting a change in a magnetic field, and an integrated circuit formed on the substrate for carrying out predetermined arithmetic processing based on a change in a magnetic field detected by the giant magnetoresistance element, wherein the giant magnetoresistance element and the integrated circuit are formed on the same surface.Type: ApplicationFiled: June 5, 2002Publication date: October 24, 2002Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Motohisa Taguchi, Izuru Shinjo, Yuji Kawano, Tatsuya Fukami, Kazuhiko Tsutsumi, Yuuichi Sakai, Naoki Hiraoka, Yasuyoshi Hatazawa
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Publication number: 20020101233Abstract: A magnetic detection apparatus is able to ensure good performance in detecting the position of an detected portion even with a shift or displacement in the position of a magnetoelectric conversion element. The magnetic detection apparatus includes at least one magnetoelectric conversion element 15 disposed to face one of teeth 12a and grooves 12b of a rotating member 11, a magnet 14 with a direction of magnetization thereof oriented in a direction perpendicular to a radial direction of the rotating member 11 in which the magnet 14 faces the rotating member 11, and a magnetic guide 21 having a first pole projection 21a and a second pole projection 21b formed in a spaced apart relation with respect to each other in a radial direction of the magnetic moving object in which the magnetic guide 21 faces one of the teeth 21a and the grooves 21b of the rotating member 11.Type: ApplicationFiled: July 12, 2001Publication date: August 1, 2002Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Masahiro Yokotani, Izuru Shinjo, Takuji Nada, Tatsuya Fukami
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Patent number: 6426620Abstract: A magnetic field sensing element comprises an underlayer formed on a substrate, a giant magnetoresistance element formed on the underlayer for detecting a change in a magnetic field, and an integrated circuit formed on the substrate for carrying out predetermined arithmetic processing based on a change in a magnetic field detected by the giant magnetoresistance element, wherein the giant magnetoresistance element and the integrated circuit are formed on the same surface.Type: GrantFiled: May 10, 1999Date of Patent: July 30, 2002Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Motohisa Taguchi, Izuru Shinjo, Yuji Kawano, Tatsuya Fukami, Kazuhiko Tsutsumi, Yuuichi Sakai, Naoki Hiraoka, Yasuyoshi Hatazawa
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Patent number: 6323644Abstract: The present invention improves the sensitivity and expands the temperature range of operation of a magnetic detection device used in conjunction with rotary shafts such as those found in automobiles. A magnetic detection element consists of a giant magnetoresistance element and an integrated circuit for performing a predetermined operational processing based on the variation of magnetic field detected by the giant magnetoresistance element, and the magnetic detection element is operated in the magnetic field in the range of exceeding the magnetic field for maximizing the resistance value of the giant magnetoresistance element and below the field obtained by multiplying the saturation magnetic field of the giant magnetoresistance element by 0.8.Type: GrantFiled: October 22, 1999Date of Patent: November 27, 2001Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Motohisa Taguchi, Izuru Shinjo, Yuji Kawano, Tatsuya Fukami, Kazuhiko Tsutsumi, Ikuya Kawakita
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Patent number: 6239595Abstract: A magnetic field sensing element comprises an underlayer formed on a substrate, a giant magnetic resistance element formed on the underlayer for detecting a change in a magnetic field, and an integrated circuit formed on the substrate for carrying out predetermined arithmetic processing based on a change in a magnetic field detected by the giant magnetic resistance element, wherein the giant magnetic resistance element and the integrated circuit are formed on the same surface.Type: GrantFiled: November 19, 1998Date of Patent: May 29, 2001Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Izuru Shinjo, Yasuyoshi Hatazawa, Tatsuya Fukami, Motohisa Taguchi, Kazuhiko Tsutsumi, Yuuichi Sakai, Naoki Hiraoka
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Patent number: 6139949Abstract: A magneto-optical recording medium in which information can be overwritten by a magnetic field modulation method, is provided with a magnetic thin film satisfying an inequality t.times.M.sub.s <5 .mu.m.multidot.emu/cc wherein the film thickness is, represented by t .mu.m and the saturating magnetization is represented by M.sub.s emu/cc. Even in the case where the intensity of the modulated magnetic field applied to the magneto-optical recording medium is small, a carrier to noise ratio C/N of not. less than a predetermined value and a jitter of not more than a predetermined value can be realized.Type: GrantFiled: April 22, 1993Date of Patent: October 31, 2000Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kazuhiko Tsutsumi, Tatsuya Fukami
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Patent number: 6088179Abstract: A method of and an apparatus for magnetic recording and reproducing comprising: detecting a tunnel current generated by a spin tunnel effect caused between a conductive magnetic recording film, in which a signal is recorded as a difference of magnetizing directions, and a conductive magnetic film, which is located on the magnetic head and magnetized in a predetermined direction; and reproducing the above signal recorded in the conductive magnetic recording film, to thereby obtain a high recording density and a reproducing signal having a high frequency.Type: GrantFiled: January 21, 1998Date of Patent: July 11, 2000Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hiroshi Sugahara, Kazuhiko Tsutsumi, Tatsuya Fukami
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Patent number: 5995309Abstract: A method for magnetically recording/reproducing comprising recording an information signal by forming a pattern of a soft magnetic material in a magnetic recording medium; providing a magnetoeletric converting element in a place neighboring a face of forming the pattern of the magnetic recording medium on which the pattern is formed, applying a magnetic field to the pattern; and reproducing the information by detecting a variation of the magnetic field caused by the pattern of the soft magnetic material of the magnetic recording medium while relatively moving the magnetoelectric converting element and the magnetic recording medium.Type: GrantFiled: June 20, 1997Date of Patent: November 30, 1999Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Shigehisa Suzuki, Tatsuya Fukami, Yoshio Fujii, Yuji Kawano, Yoshinobu Maeda
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Patent number: 5764600Abstract: A recording/reproduction method for recording or reproducing information using the magneto-optical recording medium, the magneto-optical recording medium comprising a first magnetic layer comprising a rare earth-transition metal alloy or a ferromagnetic material containing a magnetic transition metal, a second magnetic layer comprising a rare earth-transition metal alloy, a third magnetic layer comprising a rare earth-transition metal alloy, a fourth magnetic layer comprising a rare earth-transition metal alloy, a fifth magnetic layer comprising a rare earth-transition metal alloy, and a sixth magnetic layer comprising a rare earth-transition metal alloy, the second to sixth magnetic layers being stacked in this order on the first magnetic layer, adjacent layers of the second to sixth magnetic layers being coupled by an exchange force thereof.Type: GrantFiled: June 5, 1995Date of Patent: June 9, 1998Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yoshio Fujii, Tatsuya Fukami, Takashi Tokunaga, Yoshiyuki Nakaki, Kazuhiko Tsutsumi
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Patent number: 5738938Abstract: A magnetoelectric transducer is proposed using the GMR effect which operates stably even in a wider range of magnetic field, and over a wider temperature range, than currently available. Upon a substrate 5 there are formed a first magnetic layer 1, a non magnetic layer 3, a second magnetic layer 2, and a rare earth--transition metal alloy layer 4. The second magnetic layer 2 and the rare earth--transition metal alloy layer undergo exchange coupling. The axes of easy magnetization of the second magnetic layer 2 and the rare earth--transition metal alloy layer 4 lie along the surfaces of these layers. The composition of the rare earth--transition metal alloy layer 4 exhibits rare earth dominance at room temperature. The main component of the non magnetic layer 3 is Cu, and the thickness of this layer 3 is at least 1.5 nm.Type: GrantFiled: March 29, 1996Date of Patent: April 14, 1998Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yuji Kawano, Tatsuya Fukami, Yoshinobu Maeda
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Patent number: 5703733Abstract: A method for magnetically recording/reproducing comprising recording an information signal by forming a pattern of a soft magnetic material in a magnetic recording medium; providing a magnetoeletric converting element a place neighboring a face of forming the pattern of the magnetic recording medium on which the pattern formed; applying a magnetic field to the pattern; and reproducing the information by detecting a variation of the magnetic field caused by the pattern of the soft magnetic material of the magnetic recording medium while relatively moving the magnetoelectric converting element and the magnetic recording medium.Type: GrantFiled: July 25, 1995Date of Patent: December 30, 1997Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Shigehisa Suzuki, Tatsuya Fukami, Yoshio Fujii, Yuji Kawano, Yoshinobu Maeda
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Patent number: 5679455Abstract: This invention relates to a multi-layer magneto-optic recording medium having an information recording layer and an initializing layer that can be overwritten by light modulation, and in which adjacent layers, including auxiliary layers provided for more efficient transfer from the initializing layer to the recording layer, are coupled by an exchange force. This structure enables high-density, high-speed recording of audio information, visual information, and computer data.Type: GrantFiled: June 7, 1995Date of Patent: October 21, 1997Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yoshiyuki Nakaki, Takashi Tokunaga, Tatsuya Fukami, Motohisa Taguchi, Kazuhiko Tsutsumi
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Patent number: 5638344Abstract: A multi-layer magneto-optic recording medium having an information recording layer and an initializing layer that can be overwritten by light modulation, and in which adjacent layers, including auxiliary layers provided for more efficient transfer from the initializing layer to the recording layer, are coupled by an exchange force. This structure enables high-density, high-speed recording of audio information, visual information, and computer data.Type: GrantFiled: November 29, 1995Date of Patent: June 10, 1997Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yoshiyuki Nakaki, Takashi Tokunaga, Tatsuya Fukami, Motohisa Taguchi, Kazuhiko Tsutsumi
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Patent number: 5593791Abstract: A magneto-optical recording medium wherein an initializing layer is covered with a resin layer for dissipating heat from the initializing layer thereby to prevent signal degradation at high recording power and thus excellent in record/reproduce repetition times, and the initializing layer is compositionally modulated thereby to broaden allowable ranges for the recording/reproducing light intensity and for the external magnetic field, besides the composition of a first or a second magnetic layer is controlled thereby to enhance recording sensitivity, and the exchange-coupling force between the first and second magnetic layers or the magnetic field strengthe to reverse the magnetization of the first magnetic layer is controlled thereby to enhance the recording/reproducing characteristics.Type: GrantFiled: October 16, 1995Date of Patent: January 14, 1997Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yoshio Fujii, Takashi Tokunaga, Yoshiyuki Nakaki, Kazuhiko Tsutsumi, Kazuo Hashima, Tatsuya Fukami, Yuji Kawano
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Patent number: 5547751Abstract: A magneto-optical recording medium wherein an initializing layer is covered with a resin layer for dissipating heat from the initializing layer thereby to prevent signal degradation at high recording power and thus excellent in-record/reproduce repetition times, and the initializing layer is compositionally modulated thereby to broaden allowable ranges for the recording/reproducing light intensity and for the external magnetic field, besides the composition of a first or a second magnetic layer is controlled thereby to enhance recording sensitivity, and the exchange-coupling force between the first and second magnetic layers or the magnetic field strengthe to reverse the magnetization of the first magnetic layer is controlled thereby to enhance the recording/reproducing characteristics.Type: GrantFiled: March 14, 1994Date of Patent: August 20, 1996Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yoshio Fujii, Takashi Tokunaga, Yoshiyuki Nakaki, Kazuhiko Tsutsumi, Kazuo Hashima, Tatsuya Fukami, Yuji Kawano
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Patent number: 5512366Abstract: This invention relates to a multi-layer magneto-optic recording medium having an information recording layer and an initializing layer that can be overwritten by light modulation, and in which adjacent layers, including auxiliary layers provided for more efficient transfer from the initializing layer to the recording layer, are coupled by an exchange force. This structure enables high-density, high-speed recording of audio information, visual information, and computer data.Type: GrantFiled: November 13, 1990Date of Patent: April 30, 1996Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yoshiyuki Nakaki, Takashi Tokunaga, Tatsuya Fukami, Motohisa Taguchi, Kazuhiko Tsutsumi
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Patent number: 5449566Abstract: A magneto-optical recording medium allowing both direct overwriting by light power modulation and superresolutive reproduction, and a recording/reproduction method therefor are provided. The magneto-optical recording medium includes six magnetic layers of which adjacent layers are coupled by an exchange force thereof, the first magnetic layer being made of a rare earth-transition metal alloy or a ferromagnetic material containing a magnetic transition metal, the second to sixth magnetic layers being each composed of a rare earth-transition metal alloy. Each of the magnetic layers has a predetermined Curie temperature, and the respective transition metal sub-lattice magnetization directions of the first to third magnetic layers (including the magnetization direction of the first layer) are aligned in one direction at room temperature while at the same time those of the fourth to sixth magnetic layers are aligned in one direction at room temperature.Type: GrantFiled: August 17, 1993Date of Patent: September 12, 1995Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yoshio Fujii, Tatsuya Fukami, Takashi Tokunaga, Yoshiyuki Nakaki, Kazuhiko Tsutsumi
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Patent number: 5448515Abstract: A magnetic thin film memory is provided including a plurality of magnetic thin film memory elements each adapted to record information on the basis of the direction of magnetization of a magnetic thin film thereof, the magnetic thin film memory elements being each composed of at least the magnetic thin film and a switching element. With such a constitution the magnetic thin film memory can be reduced in size while a sufficiently large signal can be obtained with a substantially improved SN ratio. A method for recording and reproduction information using the magnetic thin film memory is also provided. In another aspect, the present invention provides a magnetic thin film memory element including at least two kinds of magnetic layer, and a nonmagnetic layer which is interposed between the magnetic layers wherein the two kinds of magnetic layers are stacked so as to be coupled to each other by an exchange interaction through the nonmagnetic layer.Type: GrantFiled: August 17, 1993Date of Patent: September 5, 1995Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Tatsuya Fukami, Motohisa Taguchi, Yuji Kawano, Kazuhiko Tsutsumi
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Patent number: 5432734Abstract: A MR element which has a basically three-layered structure wherein the first and the second magnetic layer sandwich the nonmagnetic layer or of a basically five-layered structure wherein nonmagnetic layers are sandwiched between the first and second magnetic layers and between the second and third magnetic layers, respectively. The MR element of such arrangement offers a surprisingly large MR ratio under application of a sufficiently low magnetic field despite such a simple arrangement thereof.Type: GrantFiled: December 21, 1993Date of Patent: July 11, 1995Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yuji Kawano, Tatsuya Fukami, Motohisa Taguchi, Kazuhiko Tsutsumi
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Patent number: 5361226Abstract: A magnetic thin film memory device having information recorded in a magnetic thin film thereof by the direction of magnetization, and adapted to reproduce the recorded information on the basis of the voltage generated as a result of the change of the magnetization direction due to the extraordinary Hall effect, magnetoresistance effect or the like.A magnetic thin film memory device in which a magnetic thin film is formed of ferrimagnetic substance having perpendicular magnetic anisotropy, and producing extraordinary Hall effect in the composition of RE rich and having the minimum saturation field which enables recording in a small magnetic field and is hard to be influenced by temperatures.Type: GrantFiled: March 5, 1992Date of Patent: November 1, 1994Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Motohisa Taguchi, Tatsuya Fukami, Kazuhiko Tsutsumi, Hiroshi Shibata, Shinji Tanabe, Hiroshi Kobayashi, Yuzo Ohdoi