Patents by Inventor Yasunori Abe

Yasunori Abe 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).

  • Publication number: 20120326708
    Abstract: To provide a magnetic encoder that is stable relative to an outside force and has only small variation of a gap between a magnetic sensor and a magnetic medium. The magnetic encoder includes a magnetic medium placed on a first member and a magnetic sensor placed on the second member, the first and second member for moving relative to each other. The magnetic sensor includes a sensor substrate, a sensor holding plate for holding the sensor substrate, and a wire for extracting a signal from the magneto-resistive element to outside. The sensor holding plate includes a fixing portion for fixing the sensor holding plate to the second member, a sensor holding member for holding the sensor substrate, and a plurality of arm portions provided in the relative movement direction with the sensor holding member in-between and extending from the fixing portion to constitute a cantilever.
    Type: Application
    Filed: May 16, 2011
    Publication date: December 27, 2012
    Applicant: HITACHI METALS, LTD.
    Inventors: Yasunori Abe, Masakazu Sugimoto
  • Publication number: 20120112741
    Abstract: To provide a method which can define the direction and orientation of magnetization of a pinned layer while reducing the number of steps of forming a GMR film. The magnetization direction of the pinned layer is defined in a plurality of directions by forming a plurality of patterns having directivities. Further, when the magneto-resistive effect film is formed, a magnetic field is applied in a direction at an angle set between the angles of the plurality of patterns.
    Type: Application
    Filed: July 13, 2010
    Publication date: May 10, 2012
    Applicant: HITACHI METALS, LTD.
    Inventors: Kenichi Meguro, Hiroyuki Hoshiya, Keizou Katou, Yasunori Abe
  • Patent number: 8159212
    Abstract: To disclose a magnetic encoder being subjected to only small gap variation between a magnetic sensor element and a magnetic medium and readily assembled, and having a smaller number of components, high sliding resistance, and high stability against outside force, such as shock or the like. The magnetic sensor holding mechanism has a swirling spring plate structure having elasticity with respect to rotation around a rotation axis in a reciprocative slide relative movement direction, elasticity with respect to rotation around a rotation axis in a direction perpendicular to the reciprocative relative movement direction and in parallel to the magnetic medium, and elasticity in the direction perpendicular to the sensor element. A load between 50 mN and 80 mN is applied to press onto the magnetic medium.
    Type: Grant
    Filed: February 21, 2008
    Date of Patent: April 17, 2012
    Assignee: Hitachi Metals, Ltd.
    Inventors: Yasunori Abe, Yuji Nihei, Shinji Furuichi, Yasuko Furuichi, legal representative
  • Patent number: 7990139
    Abstract: Disclosed is a small-sized two-axis magnetic field sensor having a function to cause a magnetic field canceling an external offset magnetic field. The two-axis magnetic field sensor contains a plane coil disposed on a plane and four sets of magneto-resistance element pairs on a plane parallel to the plane coil. The plane coil includes at least two pairs of parallel conductors, and two magneto-resistance elements cross only a single conductor of the coil. A current for canceling the external offset magnetic field is determined in advance, and while a DC current that causes total magnetic fields of biasing magnetic fields plus a magnetic field for canceling the external offset magnetic field flows through the coil, intermediate potential outputs from the magneto-resistance element pairs are detected to measure a magnetic field direction, such as geo-magnetism.
    Type: Grant
    Filed: March 22, 2007
    Date of Patent: August 2, 2011
    Assignee: Hitachi Metals, Ltd.
    Inventors: Yasunori Abe, Tomoki Ono, Yuji Nihei
  • Publication number: 20110163739
    Abstract: Provided are a self-pinned spin valve magnetoresistance effect film, a magnetic sensor using the same, and a rotation angle detection device. The self-pinned spin valve magnetoresistance effect film has a strong coupling magnetic field in a pinned layer, a small reduction in the change in resistance, and superior resistance to magnetic fields without reducing the coercive force in a first ferromagnetic layer, which is a pinned layer in the film, even when exposed to a strong external magnetic field. By inserting a non-magnetic layer between a ground layer and a pinned layer to form the spin valve magnetoresistance effect film, the self-pinned spin valve magnetoresistance effect film having superior resistance to magnetic fields, a magnetic sensor using the same, and a rotation angle detection device are obtained.
    Type: Application
    Filed: August 10, 2009
    Publication date: July 7, 2011
    Applicant: HITACHI METALS, LTD.
    Inventors: Tomoki Ono, Yasunori Abe, Fumio Shirasaki
  • Publication number: 20100327857
    Abstract: There is provided an angle sensor and angle detection device of high output and high accuracy with a wide operating temperature range. First through eighth sensor units 511, 522, 523, 514, 531, 542, 543 and 534 are produced from spin valve magnetoresistive films that use a self-pinned type ferromagnetic pinned layer comprising two layers of ferromagnetic films that are strongly and anti-ferromagnetically coupled. The respective sensor units are produced via the formation and patterning of thin-films magnetized at angles that differ by 90°, and the formation of insulation films. By using, for the ferromagnetic films, CoFe and FeCo films that have similar Curie temperatures to make the difference in magnetization amount be zero, high immunity to external magnetic fields, a broad adaptive temperature range, and high output are realized.
    Type: Application
    Filed: December 3, 2008
    Publication date: December 30, 2010
    Applicant: HITACHI METALS, LTD.
    Inventors: Hiroyuki Hoshiya, Kenichi Meguro, Kazuhiro Nakamoto, Yasunori Abe
  • Publication number: 20100141242
    Abstract: To disclose a magnetic encoder being subjected to only small gap variation between a magnetic sensor element and a magnetic medium and readily assembled, and having a smaller number of components, high sliding resistance, and high stability against outside force, such as shock or the like. The magnetic sensor holding mechanism has a swirling spring plate structure having elasticity with respect to rotation around a rotation axis in a reciprocative slide relative movement direction, elasticity with respect to rotation around a rotation axis in a direction perpendicular to the reciprocative relative movement direction and in parallel to the magnetic medium, and elasticity in the direction perpendicular to the sensor element. A load between 50 mN and 80 mN is applied to press onto the magnetic medium.
    Type: Application
    Filed: February 21, 2008
    Publication date: June 10, 2010
    Applicant: Hitachi Metals Ltd.
    Inventors: Yasunori Abe, Yuji Nihei, Shinji Furuichi, Yasuko Furuichi
  • Patent number: 7689401
    Abstract: In delay characteristic evaluation of a logical circuit, there was the problem of underestimation of the output load compared with the actual output load. There is provided a simulation device including a simplification section that, simplifies the load circuit using a transistor with which a virtual control voltage source is connected, by specifying a transistor driven through the output terminal of the target circuit and connecting to the drain of this transistor the virtual control voltage source whereby the output potential of this transistor is varied in accordance with the gate potential of this transistor.
    Type: Grant
    Filed: February 28, 2005
    Date of Patent: March 30, 2010
    Assignee: Fujitsu Limited
    Inventor: Yasunori Abe
  • Publication number: 20100006196
    Abstract: There is provided a pneumatic tire capable of surely restraining uneven wear for a long term.
    Type: Application
    Filed: August 28, 2007
    Publication date: January 14, 2010
    Applicant: Bridgestone Corporation
    Inventor: Yasunori Abe
  • Patent number: 7549335
    Abstract: A free fall detection device capable of detecting a fall accompanied by rotation is provided. A fall accompanied by rotation is detected based on a waveform of an acceleration signal output from the acceleration detection unit and an angular velocity signal output from the angular velocity detection unit. A gravity center acceleration of the device to be protected is calculated from the acceleration detected by the acceleration detection unit and from the angular velocity detected by the angular velocity detection unit. Even when the device being protected rotates as it falls, the fall of the device can be detected from the detected acceleration or angular velocity. Further, by calculating the gravity center acceleration not affected by the rotation, it is possible to detect a fall of the device with high precision even if the device rotates as it falls.
    Type: Grant
    Filed: February 17, 2006
    Date of Patent: June 23, 2009
    Assignee: Hitachi Metals, Ltd.
    Inventors: Hideki Inoue, Munetoshi Unuma, Yasunori Abe, Masakatsu Saitoh
  • Publication number: 20090108841
    Abstract: Disclosed is a small-sized two-axis magnetic field sensor having a function to cause a magnetic field canceling an external offset magnetic field. The two-axis magnetic field sensor contains a plane coil disposed on a plane and four sets of magneto-resistance element pairs on a plane parallel to the plane coil. The plane coil includes at least two pairs of parallel conductors, and two magneto-resistance elements cross only a single conductor of the coil. A current for canceling the external offset magnetic field is determined in advance, and while a DC current that causes total magnetic fields of biasing magnetic fields plus a magnetic field for canceling the external offset magnetic field flows through the coil, intermediate potential outputs from the magneto-resistance element pairs are detected to measure a magnetic field direction, such as geo-magnetism.
    Type: Application
    Filed: March 22, 2007
    Publication date: April 30, 2009
    Inventors: Yasunori Abe, Tomoki Ono, Yuji Nihei
  • Patent number: 7456758
    Abstract: To provide a magnetic encoder having high resolution and a high output, and a magnetoresistive sensor for an encoder. A fine sensor having a reduced demagnetization field is produced by: forming a free layer consists of a laminated soft magnetic film in which two soft magnetic layers are coupled in anti-parallel, and setting the width of a sensor unit to 2 ?m to 4 ?m.
    Type: Grant
    Filed: February 20, 2007
    Date of Patent: November 25, 2008
    Assignee: Hitachi Metals, Ltd.
    Inventors: Hiroyuki Hoshiya, Kenichi Meguro, Kazuhiro Nakamoto, Yasunori Abe
  • Publication number: 20080180864
    Abstract: The present invention provides a magnetic sensor suitable for high resolution and having high reliability by achieving stable output even at the occurrence of variations in a gap between a magnetic medium and the magnetic sensor, and a magnetic encoder using the magnetic sensor. The present invention uses a magnetoresistive element having magnetoresistive properties that satisfy the inequation, H10-50<H50-90, where H10-50 represents a magnetic field required for a resistance change from ?R×10% to ?R×50% with respect to a maximum amount of resistance change ?R on a magnetoresitance effect curve, and H50-90 represents a magnetic field required for a resistance change from ?R×50% to ?R×90%.
    Type: Application
    Filed: August 6, 2007
    Publication date: July 31, 2008
    Inventors: Kenichi MEGURO, Hiroyuki HOSHIYA, Kazuhiro NAKAMOTO, Yasuyuki OKADA, Yasunori ABE
  • Patent number: 7400137
    Abstract: The present invention provides a magnetic sensor suitable for high resolution and having high reliability by achieving stable output even at the occurrence of variations in a gap between a magnetic medium and the magnetic sensor, and a magnetic encoder using the magnetic sensor. The present invention uses a magnetoresistive element having magnetoresistive properties that satisfy the inequation, H10?50<H50?90, where H10?50 represents a magnetic field required for a resistance change from ?R×10% to ?R×50% with respect to a maximum amount of resistance change ?R on a magnetoresitance effect curve, and H50?90 represents a magnetic field required for a resistance change from ?R×50% to ?R×90%.
    Type: Grant
    Filed: August 6, 2007
    Date of Patent: July 15, 2008
    Assignee: Hitachi Metals, Ltd.
    Inventors: Kenichi Meguro, Hiroyuki Hoshiya, Kazuhiro Nakamoto, Yasuyuki Okada, Yasunori Abe
  • Patent number: 7395709
    Abstract: A fall detection device is provided, which accomplishes a fall judgment on acceleration by a simple calculation and improves uniformity of effective threshold value for the acceleration judgment as to a direction of an applied acceleration vector. The fall detection device produces a fall detection signal when an absolute value of each axis component of an acceleration measured by a three-axis acceleration sensor is less than a first threshold value, and when a sum of the absolute values of the axis components of the acceleration is less than a second threshold value that is 1.5 times to twice the first threshold value.
    Type: Grant
    Filed: July 14, 2006
    Date of Patent: July 8, 2008
    Assignee: Hitachi Metals Ltd.
    Inventors: Masaru Noda, Yasunori Abe
  • Patent number: 7378839
    Abstract: A magnetic encoder having a magnetic sensor composed of SVGMR elements, in which a signal output with a half of a cycle of magnetic regions on a magnetic medium. The magnetic encoder comprises the magnetic medium, on which first magnetic regions and second magnetic regions are oppositely magnetized along the medium extending and disposed successively and alternately with each other, and the magnetic sensor that has an even number of SVGMR elements and is movable relatively to the medium along the medium extending. Magnetizations of pinned magnetization layers of all the SVGMR elements are directed in a same direction along the medium extending.
    Type: Grant
    Filed: September 18, 2006
    Date of Patent: May 27, 2008
    Assignee: Hitachi Metals, Ltd.
    Inventors: Yasunori Abe, Yuji Nihei
  • Publication number: 20080068007
    Abstract: To provide a magnetic encoder having high resolution and a high output, and a magnetoresistive sensor for an encoder. A fine sensor having a reduced demagnetization field is produced by: forming a free layer consists of a laminated soft magnetic film in which two soft magnetic layers are coupled in anti-parallel, and setting the width of a sensor unit to 2 ?m to 4 ?m.
    Type: Application
    Filed: February 20, 2007
    Publication date: March 20, 2008
    Inventors: Hiroyuki Hoshiya, Kenichi Meguro, Kazuhiro Nakamoto, Yasunori Abe
  • Patent number: 7339369
    Abstract: A magnetic encoder having a magnetic sensor composed of SVGMR elements, in which a signal output with a cycle equal to or less than a third of a cycle of magnetic patterns on a magnetic medium. The magnetic encoder comprises the magnetic medium, on which first magnetic regions and second magnetic regions are oppositely magnetized along the medium extending and disposed successively and alternately with each other, and the sensor that has three SVGMR elements or more and is movable relatively to the medium along the medium extending. Magnetizations of pinned magnetization layers of all the SVGMR elements are directed in the same direction along the medium extending.
    Type: Grant
    Filed: November 28, 2006
    Date of Patent: March 4, 2008
    Assignee: Hitachi Metals, Ltd.
    Inventors: Yuji Nihei, Yasunori Abe
  • Publication number: 20070126417
    Abstract: A magnetic encoder having a magnetic sensor composed of SVGMR elements, in which a signal output with a cycle equal to or less than a third of a cycle of magnetic patterns on a magnetic medium. The magnetic encoder comprises the magnetic medium, on which first magnetic regions and second magnetic regions are oppositely magnetized along the medium extending and disposed successively and alternately with each other, and the sensor that has three SVGMR elements or more and is movable relatively to the medium along the medium extending. Magnetizations of pinned magnetization layers of all the SVGMR elements are directed in the same direction along the medium extending.
    Type: Application
    Filed: November 28, 2006
    Publication date: June 7, 2007
    Applicant: HITACHI METALS, LTD.
    Inventors: Yuji NIHEI, Yasunori ABE
  • Publication number: 20070076329
    Abstract: A magnetic encoder having a magnetic sensor composed of SVGMR elements, in which a signal output with a half of a cycle of magnetic regions on a magnetic medium. The magnetic encoder comprises the magnetic medium, on which first magnetic regions and second magnetic regions are oppositely magnetized along the medium extending and disposed successively and alternately with each other, and the magnetic sensor that has an even number of SVGMR elements and is movable relatively to the medium along the medium extending. Magnetizations of pinned magnetization layers of all the SVGMR elements are directed in a same direction along the medium extending.
    Type: Application
    Filed: September 18, 2006
    Publication date: April 5, 2007
    Inventors: Yasunori Abe, Yuji Nihei