Patents by Inventor Naoki Sakatsume
Naoki Sakatsume 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: 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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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: 8437107Abstract: A magnetic coupling type isolator includes: a magnetic field generator for generating an external magnetic field by an input signal; a magnetoresistive element for detecting the external magnetic field and converting the detected magnetic field into an electric signal, the magnetoresistive element being electrically insulated from the magnetic field generator and positioned in a location capable of being magnetically coupled so as to be overlapped with the magnetic field generator as seen in a top plan view; and first and second shield films overlapped with the magnetic field generator and the magnetoresistive element as seen in a top plan view, wherein a distance between the magnetoresistive element and the second shield film is set to 8 to 100 ?m.Type: GrantFiled: April 5, 2010Date of Patent: May 7, 2013Assignee: Alps Green Devices Co., Ltd.Inventors: Yosuke Ide, Masamichi Saito, Akira Takahashi, Tsuyoshi Nojima, Yoshihiro Nishiyama, Hidekazu Kobayashi, Kenji Ichinohe, Naoki Sakatsume
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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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Patent number: 8222769Abstract: A magnetic coupling type isolator includes: a magnetic field generator for generating an external magnetic field by an input signal; a magnetoresistive element for detecting the external magnetic field and converting the detected magnetic field into an electric signal, the magnetoresistive element being electrically insulated from the magnetic field generator and positioned in a location capable of being magnetically coupled so as to be overlapped with the magnetic field generator as seen in a top plan view; first and second shield films overlapped with the magnetic field generator and the magnetoresistive element as seen in a top plan view; and a third shield film disposed to surround the magnetoresistive element.Type: GrantFiled: April 5, 2010Date of Patent: July 17, 2012Assignee: Alps Green Devices Co., Ltd.Inventors: Yosuke Ide, Masamichi Saito, Akira Takahashi, Tsuyoshi Nojima, Yoshihiro Nishiyama, Hidekazu Kobayashi, Kenji Ichinohe, Naoki Sakatsume
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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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Publication number: 20100270865Abstract: A magnetic coupling type isolator includes: a magnetic field generator for generating an external magnetic field by an input signal; a magnetoresistive element for detecting the external magnetic field and converting the detected magnetic field into an electric signal, the magnetoresistive element being electrically insulated from the magnetic field generator and positioned in a location capable of being magnetically coupled so as to be overlapped with the magnetic field generator as seen in a top plan view; and first and second shield films overlapped with the magnetic field generator and the magnetoresistive element as seen in a top plan view, wherein a distance between the magnetoresistive element and the second shield film is set to 8 to 100 ?m.Type: ApplicationFiled: April 5, 2010Publication date: October 28, 2010Applicant: ALPS ELECTRIC CO., LTD.Inventors: Yosuke IDE, Masamichi SAITO, Akira TAKAHASHI, Tsuyoshi NOJIMA, Yoshihiro NISHIYAMA, Hidekazu KOBAYASHI, Kenji ICHINOHE, Naoki SAKATSUME
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Publication number: 20100270866Abstract: A magnetic coupling type isolator includes: a magnetic field generator for generating an external magnetic field by an input signal; a magnetoresistive element for detecting the external magnetic field and converting the detected magnetic field into an electric signal, the magnetoresistive element being electrically insulated from the magnetic field generator and positioned in a location capable of being magnetically coupled so as to be overlapped with the magnetic field generator as seen in a top plan view; first and second shield films overlapped with the magnetic field generator and the magnetoresistive element as seen in a top plan view; and a third shield film disposed to surround the magnetoresistive element.Type: ApplicationFiled: April 5, 2010Publication date: October 28, 2010Applicant: ALPS ELECTRIC CO., LTD.Inventors: Yosuke IDE, Masamichi SAITO, Akira TAKAHASHI, Tsuyoshi NOJIMA, Yoshihiro NISHIYAMA, Hidekazu KOBAYASHI, Kenji ICHINOHE, Naoki SAKATSUME
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Patent number: 6751071Abstract: An upper shield layer includes a Ni—Fe alloy underlying film formed by sputtering deposition, and a Ni—Fe alloy plating film formed on the underlying film by electroplating. The Fe composition ratio distribution of the upper shield layer in the thickness direction ranges from 17 to 19% by weight.Type: GrantFiled: January 16, 2001Date of Patent: June 15, 2004Assignee: Alps Electric Company Co., Ltd.Inventors: Hisayuki Yazawa, Naoki Sakatsume, Yoshihiro Kanada
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Publication number: 20010010615Abstract: An upper shield layer includes a Ni—Fe alloy underlying film formed by sputtering deposition, and a Ni—Fe alloy plating film formed on the underlying film by electroplating. The Fe composition ratio distribution of the upper shield layer in the thickness direction ranges from 17 to 19% by weight.Type: ApplicationFiled: January 16, 2001Publication date: August 2, 2001Applicant: Alps Electric Co., Ltd.Inventors: Hisayuki Yazawa, Naoki Sakatsume, Yoshihiro Kanada