Patents by Inventor Shinichirou Mochizuki

Shinichirou Mochizuki 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: 20220003533
    Abstract: An angle sensor generates an angle detection value based on a first and a second detection signal. A correction apparatus performs correction processing for generating a first corrected detection signal by adding a first correction value to the first detection signal and generating a second corrected detection signal by adding a second correction value to the second detection signal. When an angle to be detected varies with a period T and if no correction processing is performed, the angle detection value contains an Nth-order angle error component varying with a period of T/N. Each of the first and second detection signals contains an (N+1)th-order signal error component. The order of the first and second correction values is N?1.
    Type: Application
    Filed: September 15, 2021
    Publication date: January 6, 2022
    Applicant: TDK CORPORATION
    Inventor: Shinichirou MOCHIZUKI
  • Patent number: 11150076
    Abstract: An angle sensor generates an angle detection value based on a first and a second detection signal. A correction apparatus performs correction processing for generating a first corrected detection signal by adding a first correction value to the first detection signal and generating a second corrected detection signal by adding a second correction value to the second detection signal. When an angle to be detected varies with a period T and if no correction processing is performed, the angle detection value contains an Nth-order angle error component varying with a period of T/N. Each of the first and second detection signals contains an (N+1)th-order signal error component. The order of the first and second correction values is N?1.
    Type: Grant
    Filed: July 16, 2019
    Date of Patent: October 19, 2021
    Assignee: TDK CORPORATION
    Inventor: Shinichirou Mochizuki
  • Publication number: 20210293538
    Abstract: A magnetic sensor device includes first and second surfaces, and first and second inclined surfaces, which are inclined with respect to the first surface; first through third magnetic sensor units for detecting magnetism in first through third axial directions; and a signal processing unit that performs signal processing on the basis of first through third sensor signals output from the first through third magnetic sensor units. The first axial direction is a direction orthogonal to the first surface, and the second and third axial directions are directions orthogonal to each other on the first surface. The first and second magnetic sensor units are provided on the second inclined surface, respectively. A corrected signal generation unit included in the signal processing unit generates first and second corrected signals, which are the first and second sensor signals corrected in accordance with the inclination angles of the first and second inclined surfaces.
    Type: Application
    Filed: December 19, 2020
    Publication date: September 23, 2021
    Inventor: Shinichirou MOCHIZUKI
  • Publication number: 20210140837
    Abstract: An operation processing apparatus that calculates a rotation angle based on a first output signal and a second output signal, which differ in signal frequency from each other, is provided with a first cross-coupled operation part that performs a first cross-coupled operation and a second cross-coupled operation part that performs a second cross-coupled operation based on the first and second output signals. A first Lissajous curve generation part generates a first Lissajous curve based on the result of operation by the first cross-coupled operation part, and a second Lissajous curve generation part generates a second Lissajous curve based on the result of operation by the second cross-coupled operation part. A rotation angle computing part calculates the rotation angle based on the first Lissajous curve and the second Lissajous curve.
    Type: Application
    Filed: January 19, 2021
    Publication date: May 13, 2021
    Inventors: Shinichirou MOCHIZUKI, Hiraku HIRABAYASHI
  • Patent number: 10948368
    Abstract: An operation processing apparatus that calculates a rotation angle based on a first output signal and a second output signal, which differ in signal frequency from each other, is provided with a first cross-coupled operation part that performs a first cross-coupled operation and a second cross-coupled operation part that performs a second cross-coupled operation based on the first and second output signals. A first Lissajous curve generation part generates a first Lissajous curve based on the result of operation by the first cross-coupled operation part, and a second Lissajous curve generation part generates a second Lissajous curve based on the result of operation by the second cross-coupled operation part. A rotation angle computing part calculates the rotation angle based on the first Lissajous curve and the second Lissajous curve.
    Type: Grant
    Filed: October 17, 2018
    Date of Patent: March 16, 2021
    Assignee: TDK Corporation
    Inventors: Shinichirou Mochizuki, Hiraku Hirabayashi
  • Patent number: 10871381
    Abstract: An angle sensor includes a plurality of composite magnetic field information generation units and an angle computing unit. The plurality of composite magnetic field information generation units detect, at a plurality of detection positions, a composite magnetic field of a magnetic field to be detected and a noise magnetic field other than the magnetic field to be detected, and thereby generate a plurality of pieces of composite magnetic field information including information on at least the direction, out of the direction and the strength, of the composite magnetic field. At each of the plurality of detection positions, the magnetic field to be detected varies in direction according to an angle to be detected. The angle computing unit generates a detected angle value using the method of least squares on the basis of the plurality of pieces of composite magnetic field information.
    Type: Grant
    Filed: November 7, 2017
    Date of Patent: December 22, 2020
    Assignee: TDK CORPORATION
    Inventors: Kenkichi Anagawa, Shinichirou Mochizuki, Hiraku Hirabayashi, Kazuya Watanabe
  • Publication number: 20200300665
    Abstract: A magnetic sensor system includes a magnetic device and a signal processing circuit. The device generates first to third detection signals corresponding to components in three directions of a magnetic field generated by a magnetic field generator that is able to change its relative position with respect to the device. The circuit includes a longest segment extraction section and a midpoint coordinate computing section. With coordinates that represent a set of values of the first to third detection signals at a certain timing in an orthogonal coordinate system being taken as a measurement point, the longest segment extraction section extracts a first point and a second point that define a line segment having the greatest length among a plurality of measurement points at a plurality of timings. The midpoint coordinate computing section determines coordinates of a midpoint of the line segment defined by the first and second points.
    Type: Application
    Filed: January 15, 2020
    Publication date: September 24, 2020
    Applicant: TDK CORPORATION
    Inventors: Shunji SARUKI, Shinichirou MOCHIZUKI
  • Publication number: 20200300602
    Abstract: An angle sensor includes a first magnetic sensor and a second magnetic sensor. The first magnetic sensor includes first and second detectors, and first and second analog-to-digital converters for converting analog detection signals generated by the first and second detectors into digital detection signals. The second magnetic sensor includes third and fourth detectors, and third and fourth analog-to-digital converters for converting analog detection signals generated by the third and fourth detectors into digital detection signals. The first to fourth analog-to-digital converters perform sampling at the same sampling time.
    Type: Application
    Filed: December 30, 2019
    Publication date: September 24, 2020
    Applicant: TDK CORPORATION
    Inventors: Shinichirou MOCHIZUKI, Masanori SAKAI
  • Publication number: 20200300931
    Abstract: A magnetic sensor system includes a magnetic sensor device and a signal processing circuit. The magnetic sensor device generates first to third detection signals corresponding to components in three directions a field generated by a magnetic field generator that is able to change its relative position with respect to the magnetic sensor device. The signal processing circuit includes first and second processors. The second processor generates sphere information and transmits it to the first processor. When coordinates representing a set of values of the first to third detection signals in an orthogonal coordinate system are taken as a measurement point, the sphere information includes data on center coordinates of a virtual sphere having a spherical surface approximating a distribution of a plurality of measurement points. The first processor detects a change in offsets of the first to third detection signals by using the sphere information transmitted from the second processor.
    Type: Application
    Filed: January 15, 2020
    Publication date: September 24, 2020
    Applicant: TDK CORPORATION
    Inventors: Shunji SARUKI, Shinichirou MOCHIZUKI
  • Publication number: 20200300668
    Abstract: A signal processing circuit processes first to third detection signals output from a magnetic sensor device. The signal processing circuit includes a sphere information generation section that performs first processing and a determination section that performs second processing. With a set of values of the first to third detection signals at a certain timing taken as measurement data and with coordinates that represent the measurement data in an orthogonal coordinate system taken as a measurement point, the first processing includes determining center coordinates of a virtual sphere having a spherical surface approximating the distribution of a plurality of measurement data. The second processing includes determining whether four or more pieces of measurement data are suitable for use in the first processing.
    Type: Application
    Filed: February 11, 2020
    Publication date: September 24, 2020
    Applicant: TDK CORPORATION
    Inventors: Shunji SARUKI, Shinichirou MOCHIZUKI
  • Publication number: 20200256934
    Abstract: A magnetic sensor system includes two magnetic sensors that detect components in two directions of an external magnetic field, an additional magnetic field generation section, and a signal processing circuit. The additional magnetic field generation section is capable of generating two additional magnetic fields for use in measuring the sensitivities of the two magnetic sensors. The signal processing circuit includes a sensitivity measurement processing section and a detection signal correction processing section. The sensitivity measurement processing section measures the sensitivities based on data concerning changes in the detection signals of the two magnetic sensors when the additional magnetic field generation section is controlled to generate two additional magnetic fields. The detection signal correction processing section performs processing for reducing change components attributable to the two additional magnetic fields on the detection signals of the two magnetic sensors.
    Type: Application
    Filed: January 16, 2020
    Publication date: August 13, 2020
    Applicant: TDK CORPORATION
    Inventors: Shunji SARUKI, Shinichirou MOCHIZUKI
  • Publication number: 20200256933
    Abstract: A signal processing circuit includes a correction function determination section for performing correction function determination processing, and a correction processing section for performing correction processing. The correction processing is to correct first and second detection signals by using a correction function to thereby generate first and second corrected signals. The correction function is expressed as a coefficient matrix for converting a first column vector containing the first and second detection signals as elements into a second column vector containing the first and second corrected signals as elements. The correction function determination processing includes performing arithmetic processing using a plurality of pairs of values of the first and second detection signals to determine one or two provisional correction coefficients as the correction coefficients of the correction function.
    Type: Application
    Filed: January 8, 2020
    Publication date: August 13, 2020
    Applicant: TDK CORPORATION
    Inventors: Shunji SARUKI, Shinichirou MOCHIZUKI
  • Patent number: 10697798
    Abstract: A position forecasting apparatus for forecasting a position at a predetermined time of a continuously operating moving body is provided with an estimation part that finds an estimated position state of the moving body at a time in the past before the predetermined time and a position forecasting part that forecasts the position of the moving body at the predetermined time based on the estimated position state of the moving body estimated by the estimation part.
    Type: Grant
    Filed: May 30, 2019
    Date of Patent: June 30, 2020
    Assignee: TDK Corporation
    Inventor: Shinichirou Mochizuki
  • Patent number: 10697799
    Abstract: An angle sensor includes a plurality of composite magnetic field information generation units and an angle computing unit. The plurality of composite magnetic field information generation units detect, at a plurality of detection positions, a composite magnetic field of a magnetic field to be detected and a noise magnetic field other than the magnetic field to be detected, and thereby generate a plurality of pieces of composite magnetic field information including information on the direction of the composite magnetic field. The angle computing unit generates a detected angle value by performing an operation using the plurality of pieces of composite magnetic field information so that an error of the detected angle value caused by the noise magnetic field is made smaller than in the case where the detected angle value is generated on the basis of any and only one of the plurality of pieces of composite magnetic field information.
    Type: Grant
    Filed: December 10, 2019
    Date of Patent: June 30, 2020
    Assignee: TDK CORPORATION
    Inventors: Kenkichi Anagawa, Shinichirou Mochizuki, Hiraku Hirabayashi, Kazuya Watanabe
  • Publication number: 20200182658
    Abstract: A correction apparatus for an angle sensor includes a correction processing unit, an indicator value generation unit, and a correction information determination unit. The correction processing unit performs correction processing on a plurality of detection signals to reduce an error of a detected angle value. The details of the correction processing are determined according to correction information. The indicator value generation unit generates, on the basis of the plurality of detection signals, an indicator value having a correspondence with the error of the detected angle value. The correction information determination unit generates an estimated indicator value using a function that takes one or more values each having a correspondence with the correction information as one or more variables, and determines the correction information by adaptive signal processing so as to reduce the difference between the indicator value and the estimated indicator value.
    Type: Application
    Filed: January 21, 2020
    Publication date: June 11, 2020
    Applicant: TDK CORPORATION
    Inventor: Shinichirou MOCHIZUKI
  • Publication number: 20200166381
    Abstract: An angle sensor includes a plurality of magnetic sensors and a processor. The plurality of magnetic sensors generate a plurality of detection values representing directions of a composite magnetic field, which is a composite of a magnetic field to be detected and a noise magnetic field. The processor assumes a group of estimated unknowns. The group of estimated unknowns is a set of estimated values of a first, a second, and a third unknown. The first unknown corresponds to an angle detection value. The second unknown corresponds to the direction of the noise magnetic field. The third unknown corresponds to the strength of the noise magnetic field. The processor executes a process for determining the group of estimated unknowns a plurality of times, and assumes an estimated value of the first unknown in the last determined group of estimated unknowns as the angle detection value.
    Type: Application
    Filed: November 1, 2019
    Publication date: May 28, 2020
    Applicant: TDK CORPORATION
    Inventor: Shinichirou MOCHIZUKI
  • Publication number: 20200116527
    Abstract: An angle sensor includes a plurality of composite magnetic field information generation units and an angle computing unit. The plurality of composite magnetic field information generation units detect, at a plurality of detection positions, a composite magnetic field of a magnetic field to be detected and a noise magnetic field other than the magnetic field to be detected, and thereby generate a plurality of pieces of composite magnetic field information including information on the direction of the composite magnetic field. The angle computing unit generates a detected angle value by performing an operation using the plurality of pieces of composite magnetic field information so that an error of the detected angle value caused by the noise magnetic field is made smaller than in the case where the detected angle value is generated on the basis of any and only one of the plurality of pieces of composite magnetic field information.
    Type: Application
    Filed: December 10, 2019
    Publication date: April 16, 2020
    Applicant: TDK CORPORATION
    Inventors: Kenkichi ANAGAWA, Shinichirou MOCHIZUKI, Hiraku HIRABAYASHI, Kazuya WATANABE
  • Patent number: 10571308
    Abstract: A correction apparatus for an angle sensor includes a correction processing unit, an indicator value generation unit, and a correction information determination unit. The correction processing unit performs correction processing on a plurality of detection signals to reduce an error of a detected angle value. The details of the correction processing are determined according to correction information. The indicator value generation unit generates, on the basis of the plurality of detection signals, an indicator value having a correspondence with the error of the detected angle value. The correction information determination unit generates an estimated indicator value using a function that takes one or more values each having a correspondence with the correction information as one or more variables, and determines the correction information by adaptive signal processing so as to reduce the difference between the indicator value and the estimated indicator value.
    Type: Grant
    Filed: November 21, 2017
    Date of Patent: February 25, 2020
    Assignee: TDK CORPORATION
    Inventor: Shinichirou Mochizuki
  • Publication number: 20200025551
    Abstract: An angle sensor generates an angle detection value based on a first and a second detection signal. A correction apparatus performs correction processing for generating a first corrected detection signal by adding a first correction value to the first detection signal and generating a second corrected detection signal by adding a second correction value to the second detection signal. When an angle to be detected varies with a period T and if no correction processing is performed, the angle detection value contains an Nth-order angle error component varying with a period of T/N. Each of the first and second detection signals contains an (N+1)th-order signal error component. The order of the first and second correction values is N?1.
    Type: Application
    Filed: July 16, 2019
    Publication date: January 23, 2020
    Applicant: TDK CORPORATION
    Inventor: Shinichirou MOCHIZUKI
  • Publication number: 20200025598
    Abstract: An angle sensor generates an angle detection value based on a first and a second detection signal. A correction apparatus performs correction processing for generating a first corrected detection signal by adding a first correction value to the first detection signal and generating a second corrected detection signal by adding a second correction value to the second detection signal. When an angle to be detected varies with a period T and if no correction processing is performed, the angle detection value contains an Nth-order angle error component varying with a period of T/N. Each of the first and second detection signals contains an (N?1)th-order signal error component and an (N+1)th-order signal error component. The order of the first and second correction values is N?1 or N+1.
    Type: Application
    Filed: July 16, 2019
    Publication date: January 23, 2020
    Applicant: TDK CORPORATION
    Inventor: Shinichirou MOCHIZUKI