Nonparallel Plural Magnetic Sensors Patents (Class 324/247)
  • Patent number: 10310071
    Abstract: A system and method for measuring the complex resistivity of a ground section. One embodiment utilizes stand-off capacity-coupled resistivity (CCR) sensing to inject current into the ground at a frequency within the range of 1 Khz to 1 MHz. A sensor detects the voltage which is used to determine the complex resistively of the ground and, thus, ground content. The system and method permits surveys to be conducted at speeds of 10-20 mph or more. Alternatively, current is injected into the ground along a plasma channel that is enabled with a high energy laser. Alternatively, an alpha particle generator may be used to inject the current. Multiple frequencies may be used within the range of 1 KHz to 1 MHz to produce an impedivity spectroscopy to thereby determine and/or display a map of ground content.
    Type: Grant
    Filed: September 16, 2008
    Date of Patent: June 4, 2019
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: David Mark Hull, Gregory Alton Holifield
  • Patent number: 10309992
    Abstract: Apparatus and associated methods relate to a measurement system that calculates a current in a conductor based on an odd-order spatial derivative function of signals representing magnetic-field strengths within a hole in the conductor. In an illustrative embodiment, the odd-order spatial derivative function may generate an output signal representing a spatial derivative of the in-hole magnetic field greater than the first-order. The three or more magnetic-field sensors may be configured to align on the hole's axis when inserted into the hole. When inserted into the hole, the sensors may be aligned on an axis perpendicular to a direction of current flow and be responsive to a magnetic-field directed perpendicular to both the direction of current flow and the aligned axis. Some embodiments may advantageously provide a precise measurement indicative an electrical current in the electrical conductor while substantially rejecting a stray magnetic field originating from an adjacent electrical conductor.
    Type: Grant
    Filed: March 26, 2014
    Date of Patent: June 4, 2019
    Assignee: Honeywell International Inc.
    Inventors: Andy Peczalski, Bharat B. Pant
  • Patent number: 10274507
    Abstract: A magnetic sensor module includes a magnetic sensor having an in-plane axis and an out-of-plane axis, and including a differential pair of sensor elements spaced apart from each other. The differential pair of sensor elements are configured to generate measurement values in response to sensing a bias magnetic field. The magnetic sensor module further includes a back bias magnet including two opposing poles, where the back bias magnet is magnetized in a magnetized direction that is parallel to the in-plane axis and generates the bias magnetic field; a first magnetic flux guide disposed at a first pole and configured to redirect a first portion of the bias magnetic field towards the magnetic sensor along the in-plane axis; and a second magnetic flux guide disposed at a second pole and configured to redirect a second portion of the bias magnetic field towards the back bias magnet along the magnetized direction.
    Type: Grant
    Filed: March 1, 2018
    Date of Patent: April 30, 2019
    Assignee: Infineon Technologies AG
    Inventor: Gernot Binder
  • Patent number: 10191123
    Abstract: A magnetic field measurement device capable of accurate measurement of a magnetic field even after a sensitivity of an MI sensor varies is provided. A magnetic field measurement device (1) includes an MI sensor (2) and a sensitivity calculation means (3). The MI sensor (2) includes a magneto-sensitive body (20), a detection coil (21) and a magnetic field generation coil (22) that generates a magnetic field upon energization. The sensitivity calculation means (3) varies a current flowing in the magnetic field generation coil (22) in a state where an outside-sensor magnetic field HO acting on the magneto-sensitive body (20) from outside the MI sensor (2) is constant. Consequently, the magnetic field acting on the magneto-sensitive body (20) is varied to calculate a sensitivity a by dividing a variation in an output voltage of the detection coil (21) by a variation in the magnetic field acting on the magneto-sensitive body (20).
    Type: Grant
    Filed: July 31, 2015
    Date of Patent: January 29, 2019
    Assignee: AICHI STEEL CORPORATION
    Inventors: Tomohiko Nagao, Michiharu Yamamoto
  • Patent number: 10175379
    Abstract: A first electrode is located at a borehole and a second electrode is located at the surface of the earth. At least one transmitter is selectively connected to one or both of the first and second electrodes to cause current to flow within a subsurface of the earth. When the at least one transmitter is connected to the first electrode, a current is caused to flow at a deep depth within the subsurface and deep source data is acquired. When the at least one transmitter is connected to the second electrode, a current is caused to flow at a shallow depth within the subsurface and shallow source data is acquired. The deep and shallow source data are then combined.
    Type: Grant
    Filed: November 11, 2014
    Date of Patent: January 8, 2019
    Assignee: Groundmetrics, Inc.
    Inventor: Andrew D Hibbs
  • Patent number: 10139934
    Abstract: A computer system for dynamically switching modes within a magnetic sensor device communicates through a secondary communication channel with a first magnetic sensor device and a second magnetic sensor device. The first magnetic sensor device includes at least a magnetic signal receiving functionality. The computer system determines that the second magnetic sensor device includes magnetic signal transmitting functionality and magnetic signal receiving functionality. After determining that the second magnetic sensor device includes magnetic signal transmitting functionality, the computer system causes the second magnetic sensor device to begin transmitting a first magnetic field signal.
    Type: Grant
    Filed: April 20, 2017
    Date of Patent: November 27, 2018
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Scott Francis Fullam, Lev Cherkashin, Steven James Velat
  • Patent number: 10107653
    Abstract: A sensor device includes a mounting member having fixation surfaces inside, and at least one electronic component directly or indirectly fixed to the fixation surfaces of the mounting member, and the mounting member constitutes a part of a casing for housing the electronic component. Further, the fixation surfaces are perpendicular to each other.
    Type: Grant
    Filed: January 14, 2015
    Date of Patent: October 23, 2018
    Assignee: Seiko Epson Corporation
    Inventors: Masayasu Sakuma, Yoshihiro Kobayashi, Shojiro Kitamura, Taketo Chino
  • Patent number: 9933495
    Abstract: A sensor device for suppressing a magnetic stray field, having a semiconductor body, a first pixel cell and a second pixel cell integrated into a surface of the semiconductor body together with a circuit arrangement. Each pixel cell has a first magnetic field sensor and a second magnetic field sensor to detect a magnetic field in the x-direction and a magnetic field in the y-direction. The first pixel cell is spaced apart from the second pixel cell along a connecting line, and the substrate and the semiconductor body are disposed in the same IC package. A magnet is provided that has a planar main extension surface in the direction of an x-y plane and has a magnetization with four magnetic poles in the direction of the x-y plane. The IC package is spaced apart from the main extension surface of the magnet in the z-direction and at least partially within a ring magnet.
    Type: Grant
    Filed: March 31, 2015
    Date of Patent: April 3, 2018
    Assignee: TDK-Micronas GmbH
    Inventors: Timo Kaufmann, Joerg Franke, Andreas Ring
  • Patent number: 9915708
    Abstract: An assembly of Hall sensors provides the following: the three averaged values for the magnetic field components are assigned to the same point in space, at the center of the Hall sensor assembly. This allows for the instantaneous measurement of the full field vector. With the appropriate electrical connections of the Hall elements from opposing surfaces of each pair, undesired planar Hall effect is practically cancelled out.
    Type: Grant
    Filed: December 6, 2013
    Date of Patent: March 13, 2018
    Assignee: Paul Scherrer Institut
    Inventors: Stephane Sanfilippo, Vjeran Vrankovic, Christina Wouters
  • Patent number: 9910108
    Abstract: A Real-Time Magnetic Field Camera wherein magnetic fields are instantaneously converted into an electronic display as a motion picture on a screen. The Real-Time Magnetic Field Camera is extremely portable, outputs magnetic field data instantly giving the user the ability to passively locate and study magnetic phenomenon as they exist in the real world. The Real-Time Magnetic Field Camera invention includes; magnetic sensors that are triangulated, at least one microcontroller and/or microprocessor, has a power source and has a means of an image display.
    Type: Grant
    Filed: June 27, 2016
    Date of Patent: March 6, 2018
    Inventor: Daniel Clyde Ross
  • Patent number: 9903741
    Abstract: Embodiments of the present disclosure relate to a magnetic position sensor (100; 200). The magnetic position sensor (100; 200) includes a magnetic field source (110; 210) with at least a first multi-pole magnet strip (120-1; 220-1) arranged on a first surface and with at least a second multi-pole magnet strip (120-2; 220-2) arranged on a second surface perpendicular to the first surface. The first and the second multi-pole magnet strips are arranged in a fixed relative position to each other and comprise different numbers of magnet poles (130; 132; 230; 232) along a common length.
    Type: Grant
    Filed: September 16, 2015
    Date of Patent: February 27, 2018
    Assignee: Infineon Technologies AG
    Inventor: Udo Ausserlechner
  • Patent number: 9893119
    Abstract: Disclosed examples provide wafer-level integration of magnetoresistive sensors and Hall-effect sensors in a single integrated circuit, in which one or more vertical and/or horizontal Hall sensors are formed on or in a substrate along with transistors and other circuitry, and a magnetoresistive sensor circuit is formed in the IC metallization structure.
    Type: Grant
    Filed: March 15, 2016
    Date of Patent: February 13, 2018
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Dok Won Lee, William David French, Keith Ryan Green
  • Patent number: 9850746
    Abstract: The disclosed device provides a high-accuracy plunger arrival detection system comprising a low-power magnetometer with high sensitivity and which is capable of sampling low or high intensity magnetic fields. The device processes gathered data from sensors, stores at least some processed data in memory, executes a trending algorithm which compares the magnetic field of the plunger to the ambient magnetic field or a predetermined set of initialization values, and generates an output which is relayed to a well controller. An output signal may be via hard wire, RF, wireless or other known means. In addition, the implementation of two sensing devices mounted in series and in spaced relation to each other, can provide for an actual plunger average velocity. An actual plunger average velocity, as opposed to approximate average velocity, can be used to better optimize well control and improve safety of the overall well production system.
    Type: Grant
    Filed: October 22, 2015
    Date of Patent: December 26, 2017
    Assignee: PCS FERGUSON, INC.
    Inventors: Terry R. Wright, Burke E. Lowery, Paul T. Roberts
  • Patent number: 9841470
    Abstract: Provided is a magnetic field measuring device including a first sensor unit which includes a first coil sensor configured to output a first sensor signal, a second sensor unit which includes a second coil sensor configured to output a second sensor signal and disposed in a direction perpendicular to the first coil sensor, a third sensor unit which includes a third coil sensor configured to output a third sensor signal and disposed in a direction perpendicular to the first and second coil sensors, and a digital signal processor outputs magnetic flux density based on a voltage difference between the first and fourth nodes, wherein the first to third sensor units respectively output first to third output signals in which specific voltages of the first to third sensor signals are maintained for a predetermined period of time.
    Type: Grant
    Filed: January 15, 2016
    Date of Patent: December 12, 2017
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jung Hwan Hwang, Jong Hwa Kwon
  • Patent number: 9746347
    Abstract: A sensor for sensing an angular position of a rotatable element with respect to a non-rotatable element, the sensor comprising an encoder fast in rotation with the rotatable element, and a sensor body fixed respective to the non-rotatable element. The sensor body includes at least one sensing element adapted to sense angular position or rotation speed and direction of the encoder, a signal processor support member, and a sensing data output connector comprising at least one electrical wire connected to the support member. The sensor comprises a tubular body (accommodating the connector), including a first half-shell integral with the sensor body and a second half-shell assembled with the first half-shell around the connector. A tubular body internal surface comprises at least one radial ridge adapted to block a translation of the output connector along a longitudinal axis of the tubular body by penetrating into a sheath of the connector.
    Type: Grant
    Filed: January 15, 2013
    Date of Patent: August 29, 2017
    Assignee: AKTIEBOLAGET SKF
    Inventors: Olivier Cheve, Florian Barcat, Nicolas Dhomette, Jérôme Carnac
  • Patent number: 9720126
    Abstract: In some embodiments, an apparatus and a system, as well as a method and an article, may operate to acquire a first signal from a first magnetometer at least partially disposed within a Helmholtz coil, to acquire a second signal from a second magnetometer having a sensitivity at least one thousand times less than the first magnetometer, to process the second signal to determine a drive signal, to drive the Helmholtz coil using the drive signal so as to null an ambient Earth magnetic field surrounding the first magnetometer, and to process the first signal as one of a down hole location signal or a down hole telemetry signal, the location signal to determine a range to a sub-surface object, and the telemetry signal to provide data from down hole drilling operations. Additional apparatus, systems, and methods are disclosed.
    Type: Grant
    Filed: January 19, 2012
    Date of Patent: August 1, 2017
    Assignee: Halliburton Energy Services, Inc.
    Inventor: Paul F. Rodney
  • Patent number: 9678168
    Abstract: A system including a sensor circuit and comparison circuitry. The sensor circuit is configured to provide a sensed signal. The comparison circuitry is configured to receive an input signal that corresponds to the sensed signal. The comparison circuitry provides output signals that switch state at different levels of the input signal.
    Type: Grant
    Filed: November 16, 2009
    Date of Patent: June 13, 2017
    Assignee: Infineon Technologies AG
    Inventors: Konrad Kapser, Arnold Rump
  • Patent number: 9671472
    Abstract: A system includes a helically polarized magnet having a plurality of north and south poles circumferentially and helically patterned along a linear axis. Magnetic flux varies at different positions along a linear path in a direction aligned with the linear axis. A multi-axis magnetometer and/or magnetometer array is configured with at least two sensing coils to detect the position of the helically polarized magnet by sensing the magnetic flux variations at the different positions along the linear path.
    Type: Grant
    Filed: March 3, 2014
    Date of Patent: June 6, 2017
    Assignee: Northrop Grumman Systems Corporation
    Inventors: Joseph Michael Maurio, Charles C. McCarthy, Mark Mulhern
  • Patent number: 9666343
    Abstract: An assembly for generating a superconducting magnetic field with high stability comprises a main power supply unit arranged to provide a main current to generate a superconducting magnetic field, a magnetic field measurement device for measuring the generated magnetic field, and an auxiliary power supply unit arranged to output an auxiliary current based on the measured magnetic field.
    Type: Grant
    Filed: August 22, 2016
    Date of Patent: May 30, 2017
    Inventor: Michael John Disney Mallett
  • Patent number: 9658298
    Abstract: A three-axis magnetic sensor or magnetometer is provided. Two magnetic sensor Wheatstone bridges using barber pole AMR structures are fabricated on opposite sides of a bump structure formed on a substrate to provide surfaces that are at a predetermined angle with respect to the flat surface of the substrate. The bridge assembly is oriented along the Y axis and the bridges are interconnected such that Y and Z channel signals can be produced by processing of the bridge signals. The X channel signals are provided by an X axis sensor provided on the level surface of the substrate.
    Type: Grant
    Filed: October 10, 2013
    Date of Patent: May 23, 2017
    Assignee: MEMSIC, INC
    Inventors: Yongyao Cai, Leyue Jiang, Paul Zavracky, Yang Zhao, Shuo Gu
  • Patent number: 9651636
    Abstract: A single-chip three-axis magnetic field sensing device is provided. This single-chip three-axis magnetic field sensing device comprises a substrate, a first sensing module, a second sensing module, a third sensing module and at least one coil. The substrate includes a surface. The first sensing module comprises at least one first magnetoresistive element and is configured to sense a first magnetic field component substantially parallel to the surface. The second sensing module comprises at least one second magnetoresistive element and is configured to sense a second magnetic field component substantially parallel to the surface. The third sensing module comprises at least one third magnetoresistive element and is configured to sense a third magnetic field component substantially perpendicular to the surface. Wherein one of the first magnetoresistive element and the second magnetoresistive element and the third magnetoresistive element is disposed right above or right below the at least one coil.
    Type: Grant
    Filed: August 29, 2013
    Date of Patent: May 16, 2017
    Assignee: Voltafield Technology Corp.
    Inventors: Nai-Chung Fu, Fu-Tai Liou, Jia-Mou Lee
  • Patent number: 9605975
    Abstract: A magnetic field sensor that provides target speed and direction detection that is independent of sensor-to-target orientation includes at least three differential channels, each responsive to a pair of magnetic field sensing elements to generate a respective magnetic field channel signal. A combining element is configured to generate a combined signal based on the first, second, and third magnetic field channel, signals and control circuitry responsive to the combined signal and to at least one of the first, second, and third magnetic field channel signals generates a sensor output signal that indicative of target speed and direction.
    Type: Grant
    Filed: June 5, 2015
    Date of Patent: March 28, 2017
    Assignee: ALLEGRO MICORSYSTEMS, LLC
    Inventors: Andrea Foletto, Andreas P. Friedrich
  • Patent number: 9606195
    Abstract: The present invention discloses plural planar Hall-effect sensors each having a magnetic sensing region of an elongated shape, the magnetic sensing regions having plural orientations, wherein, for a ratio of long axis length to short axis length greater than a predetermined number, effective single magnetic domain behavior is exhibited in the sensing region, the sensing having shape-induced uniaxial magnetic anisotropy with the easy axis parallel to the long axis of the magnetic sensing region; further wherein the magnitude of the uniaxial magnetic anisotropy depends on the ratio of the thickness of the sensing region to the length of the short axis, and method of operating the same to measure plural magnetic field components.
    Type: Grant
    Filed: March 3, 2014
    Date of Patent: March 28, 2017
    Assignees: BAR ILAN UNIVERSITY, B. G. NEVEG TECHNOLOGIES AND APPLICATIONS LTD.
    Inventors: Lior Klein, Asaf Grosz, Vladislav Mor, Eugene Paperno, Shai Amrusi, Igor Faivinov, Mordechai Schultz, Omer Sinwani
  • Patent number: 9601455
    Abstract: A semiconductor device includes: a substrate including a base member having a main surface and a back surface facing opposite in a thickness direction; a semiconductor element mounted on the main surface of the substrate and having at least one element pad; a wire having a bonding portion bonded to the element pad; and a sealing resin formed on the main surface of the substrate for covering the wire and at least a portion of the semiconductor element. The semiconductor element has an element exposed side surface that faces in a direction crossing the thickness direction of the substrate and is exposed from the sealing resin.
    Type: Grant
    Filed: June 30, 2015
    Date of Patent: March 21, 2017
    Assignee: ROHM CO., LTD.
    Inventors: Yuto Nishiyama, Motoharu Haga
  • Patent number: 9551772
    Abstract: An organic, spin-dependent magnetic field sensor (10) includes an active stack (12) having an organic material with a spin-dependence. The sensor (10) also includes a back electrical contact (14) electrically coupled to a back of the active stack (12) and a front electrical contact (16) electrically coupled to a front of the active stack (12). A magnetic field generator (18) is oriented so as to provide an oscillating magnetic field which penetrates the active stack (12).
    Type: Grant
    Filed: January 6, 2012
    Date of Patent: January 24, 2017
    Assignee: University of Utah Research Foundation
    Inventors: Dane McCamey, Christoph Boehme
  • Patent number: 9435662
    Abstract: A magneto-resistive angle sensor includes a first half bridge circuit including a first magneto-resistive element and a second magneto-resistive element, and a second half bridge circuit having a third magneto-resistive element and a fourth magneto-resistive element, wherein the first, second, third, and fourth magneto-resistive element are arranged parallel to a x?/y?-plane of a Cartesian reference system with an x?-axis and y?-axis, both orthogonal to each other.
    Type: Grant
    Filed: April 8, 2014
    Date of Patent: September 6, 2016
    Assignee: Infineon Technologies AG
    Inventor: Udo Ausserlechner
  • Patent number: 9423473
    Abstract: A method and structure for a three-axis magnetic field sensing device. An IC layer having first bond pads and second bond pads can be formed overlying a substrate/SOI member with a first, second, and third magnetic sensing element coupled the IC layer. One or more conductive cables can be formed to couple the first and second bond pads of the IC layer. A portion of the substrate member and IC layer can be removed to separate the first and second magnetic sensing elements on a first substrate member from the third sensing element on a second substrate member, and the third sensing element can be coupled to the side-wall of the first substrate member.
    Type: Grant
    Filed: January 27, 2015
    Date of Patent: August 23, 2016
    Assignee: MCUBE INC.
    Inventors: Hong Wan, Anthony F. Flannery
  • Patent number: 9404980
    Abstract: The magnetometers possess a detector part with a magnetosensitive material sensitive to the magnetic field and coil surrounding its magnetosensitive material to pick-up the magnetic field, a pulse generator circuit supplies pulse current to the magnetic material, a sample holding circuit including with an electronic switch synchronized with pulse timing for switching on/off and holding capacitance to charge electricity produced by the pickup coil during the switch on period, and an amplifier circuit amplifies the holding capacitance voltage. Magnetometers possess a Buffer circuit connecting the output side of the pickup coil with the input side of the Buffer circuit and connects the output side of the Buffer circuit with the input side of the electronic switch to transfer the pulse signal voltage induced in the pickup coil from the input side to the output side keeping the pulse signal voltage of the outside at the same level as the inside.
    Type: Grant
    Filed: January 22, 2014
    Date of Patent: August 2, 2016
    Assignee: MAGNEDESIGN CORPORATION
    Inventor: Yoshinobu Honkura
  • Patent number: 9354291
    Abstract: A dynamically self-adjusting magnetometer is disclosed. In one embodiment, a first sample module periodically generates an electronic signal related to at least one magnetic field characteristic of a monitored environment. A second sample module periodically generates an electronic signal related to at least one magnetic field characteristic of a monitored environment. A summing module sums the absolute value of the electronic signal from the first sample module and the electronic signal from the second sample module. A delta comparator module receives the electronic signals from each of the first sample module, the second sample module and the summing module and compares each of the electronic signals with a previously received set of electronic signals to establish a change, wherein an output is generated if the change is greater than or equal to a threshold.
    Type: Grant
    Filed: February 5, 2014
    Date of Patent: May 31, 2016
    Assignee: Broadband Discovery Systems, Inc.
    Inventor: Cory J. Stephanson
  • Patent number: 9301569
    Abstract: An article with a color change portion and a method of changing color. The article includes at least one color change portion capable of changing colors. The color change portion includes composite material including a photonic lattice. The color change portion can change colors according to one or more performance parameters. The article can be connected to a computer and the color change portion can be controlled using the computer.
    Type: Grant
    Filed: June 26, 2014
    Date of Patent: April 5, 2016
    Assignee: NIKE, Inc.
    Inventors: Sharna M. Donovan, Sean D. Hartford, Michelle L. Kvernmo, Vikram Malhotra, James Molyneux, Andrew A. Owings, Aaron B. Weast, Bradley W. Wilkins
  • Patent number: 9297863
    Abstract: A planarized 3-dimensional magnetic sensor chip includes a first magnetic sensing device, a second magnetic sensing device, a third magnetic sensing device and a magnetic flux bending concentrating structure on a circuit chip substrate, wherein the first magnetic sensing device and the second magnetic sensing device are used to measure the magnitude of flux in a first direction and a third direction together, and the third magnetic sensing device is used to measure the magnitude of flux in a second direction, the magnetic flux bending concentrating structure is used to bend the magnitude of flux in the third direction to the first direction, such that the magnitude of flux in the third direction can be measured by first magnetic sensing device and the second magnetic sensing device in the first direction.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: March 29, 2016
    Inventor: Meng-Huang Lai
  • Patent number: 9279783
    Abstract: Disclosed herein are an apparatus and a method for detecting a crack. The apparatus includes a power supply unit, a sensor module, and a signal reception module. The power supply unit supplies power. The sensor module receives the input power from the power supply unit, and outputs sensing power corresponding to the magnetic field of an object to be measured. The signal reception unit converts the sensing power output from the sensor module into a quantitative value, and computes the distribution of the magnetic field. The sensor module includes a first sensor array configured to detect magnetic field vectors in a direction vertical to a sensor surface, and a second sensor array placed on the first sensor array in an overlapping manner and configured to detect magnetic field vectors in a direction lateral with respect to the sensor surface.
    Type: Grant
    Filed: November 2, 2012
    Date of Patent: March 8, 2016
    Assignee: INDUSRTY-ACADEMIC COOPERATION FOUNDATION CHOSUN UNIVERSITY
    Inventors: Jin Yi Lee, Jong Woo Jun, Jung Min Kim
  • Patent number: 9229067
    Abstract: A magnetic field verifier apparatus includes a magnetic field detection element configured to produce a voltage signal in response to an applied magnetic field wherein the voltage signal corresponds to the strength of the applied magnetic field. Substantially identical circuit boards or units are connected to a central unit or mother board to place magnetic field detection elements of each board or unit in an mutually approximately orthogonal relationship. A microcontroller is in communication with the voltage signal. The magnetic field verifier apparatus is configurable to sense particular field strengths at various frequencies and store the readings to provide the user with a reliable verification that a particular magnetic field strength has been produced in a particular environment.
    Type: Grant
    Filed: May 2, 2014
    Date of Patent: January 5, 2016
    Assignee: Data Security, Inc.
    Inventor: Robert A. Schultz
  • Publication number: 20150115949
    Abstract: A magnetic sensor having a large magnetic-field detection angle range and a bridge circuit used in the magnetic sensor, in each of multiple MR elements in the bridge circuit, multiple strips, on the whole, along a direction substantially orthogonal to a magnetic-field detection direction are arranged in parallel at certain intervals and are sequentially connected so as to be folded back and, in each of the multiple strips, multiple strips along the magnetic-field detection direction are arranged in parallel at certain intervals and are sequentially connected so as to be folded back to form a zigzag pattern in which the multiple strips are electrically connected in series to each other.
    Type: Application
    Filed: October 30, 2014
    Publication date: April 30, 2015
    Inventor: ATSUSHI ITAGAKI
  • Patent number: 8970213
    Abstract: In a method for manufacturing the functional element, a protective film covering an underlayer, a patterned multilayer film, and a patterned cap layer are formed, and the underlayer is then processed without newly forming a resist. Thereby, an electrode can be formed in steps less than ever before. Since the protective film formed on the patterned multilayer film and the patterned cap layer is used as a mask, the problem of the misregistration can be prevented.
    Type: Grant
    Filed: June 19, 2012
    Date of Patent: March 3, 2015
    Assignee: Canon Anelva Corporation
    Inventors: Tomohiko Toyosato, Mihoko Nakamura, Kazuhiro Kimura, Masayoshi Ikeda
  • Publication number: 20150035526
    Abstract: A magnetic-field sensor, including: a die, a current generator in the die. The current generator generating a driving current. A Lorentz force transducer also in the die and being configured to obtain measurements of magnetic field based upon the Lorentz force is coupled to the current generator. The transducer having a resonance frequency. The current generator is such that the driving current has a non-zero frequency different from the resonance frequency.
    Type: Application
    Filed: July 29, 2014
    Publication date: February 5, 2015
    Inventors: Giacomo Langfelder, Alessandro Tocchio, Dario Paci
  • Patent number: 8945469
    Abstract: A magnetic immunoassay system with a mechanism for compensating the direct current residual magnetic field in the vicinity of the specimen measurement position, in a direction perpendicular to the magnetic marker direction of magnetization for the measurement target. This invention reduces the effects of the magnetic field emitted from the unbound magnetic marker due to the residual magnetic field in the specimen solution and detects with high sensitivity the signal of the bound target magnetic marker. The magnetic field at the measurement position is regulated so as to intersect the direction of magnetization of the magnetic marker for the measurement target, in order to make the magnetization direction of the magnetic marker that is unbound due to residual magnetism or remanence in the sample solution, intersect the magnetization direction of the magnetic marker for the measurement target.
    Type: Grant
    Filed: March 9, 2007
    Date of Patent: February 3, 2015
    Assignee: Hitachi, Ltd.
    Inventors: Akira Tsukamoto, Kazuo Saitoh
  • Patent number: 8896458
    Abstract: This method of converting a displacement of a magnetic object into a signal directly perceptible by a human being, comprises: —the acquisition (32) of a temporal succession of measurements of a magnetic field modified by the displacements of the object during a sliding time window of predetermined duration, —the construction (34) on the basis of this acquired temporal succession of measurements of several signals each representing a characteristic of the measured magnetic field dependent on a corresponding characteristic of the displacement of the object, and —the adjustment (50) of several parameters of the directly perceptible signal as a function of the signals so as to render these characteristics directly perceptible.
    Type: Grant
    Filed: June 25, 2010
    Date of Patent: November 25, 2014
    Assignee: Commissariat a l'energie atomique et aux energies alternatives
    Inventors: Jerome Doutaz, Roland Blanpain, Viviane Cattin
  • Patent number: 8829901
    Abstract: A method to measure a magnetic field is provided. The method includes applying an alternating drive current to a drive strap overlaying a magnetoresistive sensor to shift an operating point of the magnetoresistive sensor to a low noise region. An alternating magnetic drive field is generated in the magnetoresistive sensor by the alternating drive current. When the magnetic field to be measured is superimposed on the alternating magnetic drive field in the magnetoresistive sensor, the method further comprises extracting a second harmonic component of an output of the magnetoresistive sensor. The magnetic field to be measured is proportional to a signed amplitude of the extracted second harmonic component.
    Type: Grant
    Filed: November 4, 2011
    Date of Patent: September 9, 2014
    Assignee: Honeywell International Inc.
    Inventor: Bharat B. Pant
  • Publication number: 20140247042
    Abstract: The present invention discloses a triaxial magnetoresistive sensor. It comprises a substrate integrated with a biaxial magnetic field sensor, a Z-axis sensor that has a sensing direction along Z-axis perpendicular to the two axes of the biaxial magnetic field sensor, and an ASIC. The biaxial magnetic field sensor comprises an X-axis bridge sensor and a Y-axis bridge sensor. The Z-axis sensor and the two-axis sensor are electrically interconnected with the ASIC. A single-chip implementation of the triaxial magnetic field sensor comprises a substrate, onto which a triaxial magnetic field sensor and an ASIC are stacked. The triaxial magnetic field sensor comprises an X-axis bridge sensor, a Y-axis bridge sensor, and a Z-axis bridge sensor. The above design provides a highly integrated sensor with high sensitivity, low power consumption, good linearity, wide dynamic range, excellent thermal stability, and low magnetic noise.
    Type: Application
    Filed: August 27, 2012
    Publication date: September 4, 2014
    Applicant: MultiDimension Technology Co., Ltd.
    Inventors: Xiaofeng Lei, Xiaojun Zhang, Wei Li, Songsheng Xue
  • Publication number: 20140232386
    Abstract: A first bent portion whose extending direction changes in the order of +z, +x, +z, ?x, and +z is formed in a first current path, wherein a direction in which two current paths extend in parallel as the z-direction of the x-y-z orthogonal coordinate system and a second bent portion whose extending direction changes in the order of +z, +y, +z, ?y, and +z is formed in a second current path. Either one of the z-coordinate range of the middle part of the first bent portion and the z-coordinate range of the middle part of the second bent portion includes the other one and a magnetic flux density detection device that detects the x-direction magnetic flux density and the y-direction magnetic flux density is disposed within the included z-coordinate region.
    Type: Application
    Filed: September 18, 2012
    Publication date: August 21, 2014
    Applicants: KABUSHIKI KAISHA TOKAI RIKA DENKI SEISAKUSHO, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Tatsuyuki Yamaguchi
  • Publication number: 20140218018
    Abstract: Improved current sensing methods and apparatus and conductor apparatus are presented for sensing current in a bus bar or other conductor using one or more circular magnetic sensors or multiple magnetic sensors disposed on a substrate in a pattern surrounding a longitudinal path within the outer periphery of the conductor to avoid or mitigate sensed magnetic field crosstalk and to facilitate use of high sensitivity magnetic sensors at locations inside the conductor periphery in which the magnetic field is relatively small.
    Type: Application
    Filed: March 15, 2013
    Publication date: August 7, 2014
    Applicants: TEXAS INSTRUMENTS DEUTSCHLAND GMBH, TEXAS INSTRUMENTS INCORPORATED
    Inventors: Mikhail Valeryevich Ivanov, Siva RaghuRam Prasad Chennupati, Viola Schaffer
  • Patent number: 8791694
    Abstract: A current sensor arrangement comprises plural sensor elements arranged around a center point, each of the sensor elements having a plane of zero sensitivity to uniform magnetic fields. A first one (202) of the sensor elements has a first angular separation (X1) relative to the center point from a second, adjacent sensor element (204) and a second angular separation (X2) relative to the center point from a third, adjacent sensor element (206). The first angular separation is less than the second angular separation. An intercept (I13) of the planes of the first and third sensor elements is located outside a triangle formed by the center point and the first and third sensor elements and an intercept (I12) of the planes of the first and second sensor elements is located inside a triangle formed by the center point and the first and second sensor elements.
    Type: Grant
    Filed: August 16, 2010
    Date of Patent: July 29, 2014
    Assignee: Sentec Ltd.
    Inventors: Matthew Storkey, Andrew Dames
  • Patent number: 8786278
    Abstract: A three-dimensional magnetic field sensor includes a substrate having an element placement surface that is planar, and first, second and third MR elements disposed on a side of the element placement surface of the substrate and integrated with the substrate. Each of the first, second and third MR elements includes a magnetization pinned layer, a nonmagnetic layer, and a free layer. The magnetization pinned layer of the first MR element has a magnetization direction that is pinned in an X direction parallel to the element placement surface. The magnetization pinned layer of the second MR element has a magnetization direction that is pinned in a Y direction parallel to the element placement surface and different from the X direction. The magnetization pinned layer of the third MR element has a magnetization direction that is pinned in a Z direction perpendicular to the element placement surface.
    Type: Grant
    Filed: June 11, 2012
    Date of Patent: July 22, 2014
    Assignee: TDK Corporation
    Inventors: Naoki Ohta, Hiroshi Yamazaki
  • Patent number: 8786277
    Abstract: A magnetic signal noise reduction and detection system has inputs configured to receive data from a first total field scalar magnetometer, data from a vector magnetometer, and data from a position, velocity and heading sensor, a signal processor configured with a pre-processor system, an adaptive noise cancellation system and a detection system, the pre-processor system configured to carry out initial processing of data received. The pre-processor is configured to convert data to the frequency domain and pass the converted data to the adaptive noise cancellation system. The adaptive noise cancellation system is configured to carry out multivariate regression on the converted data to reduce detected noise. The detection system is configured to detect magnetic anomalies and output information in real time about the magnetic anomalies to a user interface.
    Type: Grant
    Filed: June 27, 2011
    Date of Patent: July 22, 2014
    Assignee: Raytheon Applied Signal Technology, Inc.
    Inventors: Michael L. Webb, Aaron C. White
  • Patent number: 8779764
    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: Grant
    Filed: July 13, 2010
    Date of Patent: July 15, 2014
    Assignee: Hitachi Metals, Ltd.
    Inventors: Kenichi Meguro, Hiroyuki Hoshiya, Keizou Katou, Yasunori Abe
  • Patent number: 8768649
    Abstract: It is possible to rapidly or highly accurately estimate a highly reliable offset according to situations and improve further the reliability of the estimated offset even if a measurement data is not obtained in a space in which the magnitude of a vector physical quantity to be measured is uniform. The offset included in the obtained vector physical quantity data are statistically estimated based on a predetermined evaluation formula using difference vectors. In the estimation of the offset, reliability information on a reference point is calculated based on at least one of the vector physical quantity data, the difference vectors and a plurality of estimated reference points according to a calculation parameter for calculating the reliability information on the reference point, whether or not the reference point is reliable is determined by comparing the reliability information with a determination threshold value.
    Type: Grant
    Filed: November 20, 2009
    Date of Patent: July 1, 2014
    Assignee: Asahi Kasei Microdevices Corporation
    Inventors: Touru Kitamura, Norihiko Mikoshiba
  • Patent number: 8768639
    Abstract: A dynamically self-adjusting magnetometer is disclosed. In one embodiment, a first sample module periodically generates an electronic signal related to at least one magnetic field characteristic of a monitored environment. A second sample module periodically generates an electronic signal related to at least one magnetic field characteristic of a monitored environment. A summing module sums the absolute value of the electronic signal from the first sample module and the electronic signal from the second sample module. A delta comparator module receives the electronic signals from each of the first sample module, the second sample module and the summing module and compares each of the electronic signals with a previously received set of electronic signals to establish a change, wherein an output is generated if the change is greater than or equal to a threshold.
    Type: Grant
    Filed: September 13, 2013
    Date of Patent: July 1, 2014
    Assignee: Broadband Discovery Systems, Inc.
    Inventor: Cory James Stephanson
  • Publication number: 20140176131
    Abstract: A three-magnet assembly configured for use in a position sensing system is disclosed. In an example, the three-magnet assembly establishes a non-linear spatially varying magnetic field configured to be measured by a magnetic field measurement device so that resolvable measurements are spatially distributed in a non-linear fashion. The resolvable measurements are distributed to a relatively higher concentration in at least one first region along a measurement stroke and to a relatively lower concentration in at least one second region along a measurement stroke, the second region being different from the first region. In an example, the different concentrations of resolvable measurements are utilized to spatially vary the precision of a position sensor along a measurement stroke. A system and methods for correlating magnetic field measurements to expected positions are also disclosed.
    Type: Application
    Filed: December 21, 2012
    Publication date: June 26, 2014
    Applicant: CONTINENTAL AUTOMOTIVE SYSTEMS, INC.
    Inventor: Continental Automotive Systems, Inc.
  • Publication number: 20140159716
    Abstract: The use of implanted medical devices that address a wide range of health conditions is rapidly expanding. These implanted devices include: Cochlear implants, drug dispensing pumps, cardiac pacemakers, defibrillators and other devices. Although these devices are designed to withstand interference from external radio frequency, electric and magnetic fields, interference can occur which may affect the operation of these devices and pose a health risk. An inventive personal, body-wearable electric field, radio frequency, and three-axis magnetic field monitoring device detects the ambient radio frequency, electric and magnetic fields and warns the wearer when any of these field measurements exceeds a safe level.
    Type: Application
    Filed: December 10, 2013
    Publication date: June 12, 2014
    Applicant: Electric Power Research Institute
    Inventors: Norman Darnell McCollough, JR., Philip Cochrane, Robert Ira Kavet