Patents by Inventor Shigenobu Miyajima
Shigenobu Miyajima 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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Patent number: 9435831Abstract: A current sensor includes a magnetic sensor module including a plurality of magnetic sensor units connected in series. The magnetic sensor units each include a first magnetic sensor element and a second magnetic sensor element which have sensitivity axes oriented in opposite directions. A first terminal of the first magnetic sensor unit is connected to a first potential source. A third terminal of the first magnetic sensor unit is connected to a second potential source. A second terminal and a fourth terminal of the last magnetic sensor unit are connected to constitute a sensor output terminal. The first terminal of each of the magnetic sensor units excluding the first magnetic sensor unit is connected to the second terminal of the next magnetic sensor unit and the third terminal thereof is connected to the fourth terminal of the next magnetic sensor unit.Type: GrantFiled: May 29, 2013Date of Patent: September 6, 2016Assignee: ALPS GREEN DEVICES CO., LTD.Inventors: Mitsuo Aratono, Masahiro Iizuka, Masamichi Saito, Akira Takahashi, Shigenobu Miyajima, Kenji Ichinohe, Yoshihiro Nishiyama, Yosuke Ide, Shinji Mitsuya
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Patent number: 8754642Abstract: A magnetic balance type current sensor includes a magnetoresistance effect element whose resistance value changes owing to the application of an induction magnetic field from a current to be measured; a feedback coil disposed in the vicinity of the magnetoresistance effect element and generating a cancelling magnetic field cancelling out the induction magnetic field; a magnetic field detection bridge circuit including two outputs causing a voltage difference corresponding to the induction magnetic field to occur; and a magnetic shield attenuating the induction magnetic field and enhancing the cancelling magnetic field, wherein, on the basis of the current flowing through the feedback coil at the time of an equilibrium state in which the induction magnetic field and the cancelling magnetic field are cancelled out, the current to be measured is measured, wherein the feedback coil, the magnetic shield, and the magnetic field detection bridge circuit are formed on a same substrate.Type: GrantFiled: November 18, 2011Date of Patent: June 17, 2014Assignee: Alps Green Devices., Ltd.Inventors: Yosuke Ide, Masahiro Iizuka, Masamichi Saito, Akira Takahashi, Hideharu Matsuo, Tsuyoshi Nojima, Shigenobu Miyajima, Naoki Sakatsume, Kenji Ichinohe, Yoshihiro Nishiyama, Tatsuya Kogure, Hidekazu Kobayashi
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Publication number: 20130249531Abstract: A current sensor includes a magnetic sensor module including a plurality of magnetic sensor units connected in series. The magnetic sensor units each include a first magnetic sensor element and a second magnetic sensor element which have sensitivity axes oriented in opposite directions. A first terminal of the first magnetic sensor unit is connected to a first potential source. A third terminal of the first magnetic sensor unit is connected to a second potential source. A second terminal and a fourth terminal of the last magnetic sensor unit are connected to constitute a sensor output terminal. The first terminal of each of the magnetic sensor units excluding the first magnetic sensor unit is connected to the second terminal of the next magnetic sensor unit and the third terminal thereof is connected to the fourth terminal of the next magnetic sensor unit.Type: ApplicationFiled: May 29, 2013Publication date: September 26, 2013Applicant: ALPS GREEN DEVICES CO., LTD.Inventors: Mitsuo ARATONO, Masahiro IIZUKA, Masamichi SAITO, Akira TAKAHASHI, Shigenobu MIYAJIMA, Kenji ICHINOHE, Yoshihiro NISHIYAMA, Yosuke IDE, Shinji MITSUYA
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Patent number: 8519704Abstract: A magnetic-balance-system current sensor includes: a magnetoresistive element, a resistance value of the magnetoresistive element being changed by applying an induction magnetic field generated by a measurement target current; magnetic cores disposed near the magnetoresistive element; a feedback coil disposed near the magnetoresistive element and configured to generate a cancelling magnetic field that cancels out the induction magnetic field; and a magnetic-field detecting bridge circuit having two outputs. The measurement target current is measured on the basis of a current flowing through the feedback coil when the induction magnetic field and the induction magnetic field and the cancelling magnetic field cancel each other out. The feedback coil, the magnetic cores, and the magnetic-field detecting bridge circuit are formed on a same substrate. The feedback coil is of a spiral type, and the magnetic cores are provided above and below the feedback coil.Type: GrantFiled: November 18, 2011Date of Patent: August 27, 2013Assignee: Alps Green Devices Co., Ltd.Inventors: Yosuke Ide, Masamichi Saito, Akira Takahashi, Tsuyoshi Nojima, Shigenobu Miyajima, Naoki Sakatsume, Kenji Ichinohe, Yoshihiro Nishiyama, Tatsuya Kogure, Hidekazu Kobayashi, Masahiro Iizuka
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Patent number: 8269492Abstract: A magnetic balance type current sensor measures a measured current which flows in a feedback coil when electrical conduction is provided by a voltage difference according to an induction magnetic field from the measured current and an equilibrium state is reached in which the induction magnetic field and a cancel magnetic field cancel each other. Sensor elements in a pair are arranged at positions with magnetic field from the measured current. The magnetization direction of the pinned magnetic layer in the magnetoresistive effect element of one sensor element is aligned in a forward direction with respect to the magnetic field formed by the measured current. The magnetization direction of the pinned magnetic layer in the magnetoresistive effect element of the other sensor element is aligned in a reverse direction with respect to the magnetic field formed by the measured current.Type: GrantFiled: September 27, 2010Date of Patent: September 18, 2012Assignee: Alps Green Devices Co., Ltd.Inventors: Masamichi Saito, Akira Takahashi, Masahiro Iizuka, Tatsuya Kogure, Yosuke Ide, Yoshihiro Nishiyama, Kenji Ichinohe, Naoki Sakatsume, Tsuyoshi Nojima, Shigenobu Miyajima, Hidekazu Kobayashi
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Publication number: 20120062224Abstract: A magnetic balance type current sensor includes a magnetoresistance effect element whose resistance value changes owing to the application of an induction magnetic field from a current to be measured; a feedback coil disposed in the vicinity of the magnetoresistance effect element and generating a cancelling magnetic field cancelling out the induction magnetic field; a magnetic field detection bridge circuit including two outputs causing a voltage difference corresponding to the induction magnetic field to occur; and a magnetic shield attenuating the induction magnetic field and enhancing the cancelling magnetic field, wherein, on the basis of the current flowing through the feedback coil at the time of an equilibrium state in which the induction magnetic field and the cancelling magnetic field are cancelled out, the current to be measured is measured, wherein the feedback coil, the magnetic shield, and the magnetic field detection bridge circuit are formed on a same substrate.Type: ApplicationFiled: November 18, 2011Publication date: March 15, 2012Applicant: ALPS GREEN DEVICES CO., LTD.Inventors: Yosuke IDE, Masahiro IIZUKA, Masamichi SAITO, Akira TAKAHASHI, Hideharu MATSUO, Tsuyoshi NOJIMA, Shigenobu MIYAJIMA, Naoki SAKATSUME, Kenji ICHINOHE, Yoshihiro NISHIYAMA, Tatsuya KOGURE, Hidekazu KOBAYASHI
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Publication number: 20120062215Abstract: A magnetic-balance-system current sensor includes: a magnetoresistive element, a resistance value of the magnetoresistive element being changed by applying an induction magnetic field generated by a measurement target current; magnetic cores disposed near the magnetoresistive element; a feedback coil disposed near the magnetoresistive element and configured to generate a cancelling magnetic field that cancels out the induction magnetic field; and a magnetic-field detecting bridge circuit having two outputs. The measurement target current is measured on the basis of a current flowing through the feedback coil when the induction magnetic field and the induction magnetic field and the cancelling magnetic field cancel each other out. The feedback coil, the magnetic cores, and the magnetic-field detecting bridge circuit are formed on a same substrate. The feedback coil is of a spiral type, and the magnetic cores are provided above and below the feedback coil.Type: ApplicationFiled: November 18, 2011Publication date: March 15, 2012Applicant: ALPS GREEN DEVICES CO., LTD.Inventors: Yosuke IDE, Masamichi SAITO, Akira TAKAHASHI, Tsuyoshi NOJIMA, Shigenobu MIYAJIMA, Naoki SAKATSUME, Kenji ICHINOHE, Yoshihiro NISHIYAMA, Tatsuya KOGURE, Hidekazu KOBAYASHI, Masahiro IIZUKA
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Publication number: 20110080165Abstract: A magnetic balance type current sensor measures a measured current which flows in a feedback coil when electrical conduction is provided by a voltage difference according to an induction magnetic field from the measured current and an equilibrium state is reached in which the induction magnetic field and a cancel magnetic field cancel each other. Sensor elements in a pair are arranged at positions with magnetic field from the measured current. The magnetization direction of the pinned magnetic layer in the magnetoresistive effect element of one sensor element is aligned in a forward direction with respect to the magnetic field formed by the measured current. The magnetization direction of the pinned magnetic layer in the magnetoresistive effect element of the other sensor element is aligned in a reverse direction with respect to the magnetic field formed by the measured current.Type: ApplicationFiled: September 27, 2010Publication date: April 7, 2011Applicant: ALPS GREEN DEVICES CO., LTD.Inventors: Masamichi SAITO, Akira TAKAHASHI, Masahiro IIZUKA, Tatsuya KOGURE, Yosuke IDE, Yoshihiro NISHIYAMA, Kenji ICHINOHE, Naoki SAKATSUME, Tsuyoshi NOJIMA, Shigenobu MIYAJIMA, Hidekazu KOBAYASHI
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Patent number: 6419552Abstract: In a thin-film magnetic head manufacturing method and apparatus, lapping is continued until the MR height of a magnetoresistive sensor falls into a finish tolerance range and the lapping time from the beginning of lapping exceeds a predetermined time, thereby substantially reducing the recession between an ABS of a slider bar and a surface of a thin-film magnetic element opposing a recording medium.Type: GrantFiled: May 23, 2001Date of Patent: July 16, 2002Inventors: Masato Katoh, Shigenobu Miyajima
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Publication number: 20010034185Abstract: In a thin-film magnetic head manufacturing method and apparatus, lapping is continued until the MR height of a magnetoresistive sensor falls into a finish tolerance range and the lapping time from the beginning of lapping exceeds a predetermined time, thereby substantially reducing the recession between an ABS of a slider bar and a surface of a thin-film magnetic element opposing a recording medium.Type: ApplicationFiled: May 23, 2001Publication date: October 25, 2001Inventors: Masato Katoh, Shigenobu Miyajima
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Patent number: 6299507Abstract: In a thin-film magnetic head manufacturing method and apparatus, lapping is continued until the MR height of a magnetoresistive sensor falls into a finish tolerance range and the lapping time from the beginning of lapping exceeds a predetermined time, thereby substantially reducing the recession between an ABS of a slider bar and a surface of a thin-film magnetic element opposing a recording medium.Type: GrantFiled: January 20, 2000Date of Patent: October 9, 2001Assignee: Alps Electric Co., Ltd.Inventors: Masato Katoh, Shigenobu Miyajima