Magnetic Field Detection Devices Patents (Class 324/260)
  • Patent number: 10248154
    Abstract: A joystick assembly for use with a device including a joystick surface and a first magnet having north and south magnetic poles includes a second magnet having north and south magnetic poles and a movable elongated shaft having first and second opposing ends arranged along a major axis of the shaft. The first end of the shaft is coupled to the second magnet such that movement of the shaft results in movement of the second magnet relative to the first magnet such that a line between centers of the north and south magnetic poles of the second magnet is movable relative to a line between the north and south magnetic poles of the first magnet. An attraction of the second magnet to the first magnet results in a restoring force upon the shaft, and the shaft and the second magnet are removable from the joystick surface.
    Type: Grant
    Filed: July 13, 2018
    Date of Patent: April 2, 2019
    Assignee: ALLEGRO MICROSYSTEMS, LLC
    Inventors: Ali Husain Yusuf Sirohiwala, William P. Taylor, Katherine Shamberger
  • Patent number: 10168395
    Abstract: The present invention relates to a magnetic sensor which can improve the detection precision of a weak magnetic field. A magnetic sensor wherein a magnetic body which changes the direction of a magnetic field input to a magnetoresistance effect element is provided in the vicinity of the magnetoresistance effect element in which the resistance value changes according to the direction of the input magnetic field, and the magnetic body has a recess with a concave shape on the surface at a side where the magnetoresistance effect element is formed. The center of the recess may be substantially identical to that of the magnetic body. The concave shape may at least include polygon having three or more sides, or may at least include arc.
    Type: Grant
    Filed: March 14, 2016
    Date of Patent: January 1, 2019
    Assignee: TDK CORPORATION
    Inventor: Kei Tanabe
  • Patent number: 10156601
    Abstract: The system includes a plurality of probe antennas that receive radio signals at a plurality of measurement positions located within a measurement plane in a near field region of an antenna to be measured, a probe scanning mechanism that moves the respective probe antennas to a plurality of measurement positions while maintaining relative positions of the plurality of probe antennas, an amplitude and phase difference measurement unit that measures a phase difference between the radio signals and measures amplitudes of the radio signals, every time the respective probe antennas are moved to the measurement positions, and a phase calculation unit that calculates a phase of the radio signal at each measurement position from the phase difference measured by the amplitude and phase difference measurement unit.
    Type: Grant
    Filed: May 15, 2017
    Date of Patent: December 18, 2018
    Assignee: ANRITSU CORPORATION
    Inventors: Aya Hinotani, Takashi Kawamura, Shigenori Mattori
  • Patent number: 10110213
    Abstract: Provided is a semiconductor device which is testable even with an inspection apparatus having low current drivability, and includes an output terminal which is also used as a test terminal and an output driver having high current drivability. The semiconductor device includes a plurality of voltage determination circuits connected to the output terminal of the semiconductor device, and have threshold values that are different from each other, an encoding circuit connected to the plurality of voltage determination circuits, and configured to output an encoded signal, and a mode switching circuit configured to output a mode signal to an internal circuit depending on the encoded signal and a signal from the internal circuit.
    Type: Grant
    Filed: August 24, 2017
    Date of Patent: October 23, 2018
    Assignee: ABLIC INC.
    Inventors: Tomoki Hikichi, Minoru Ariyama, Kozo Iijima, Masashi Shiga
  • Patent number: 10048718
    Abstract: A joystick assembly for use with a device including a joystick surface and a first magnet having north and south magnetic poles includes a second magnet having north and south magnetic poles and a movable elongated shaft having first and second opposing ends arranged along a major axis of the shaft. The first end of the shaft is coupled to the second magnet such that movement of the shaft results in movement of the second magnet relative to the first magnet such that a line between centers of the north and south magnetic poles of the second magnet is movable relative to a line between the north and south magnetic poles of the first magnet. An attraction of the second magnet to the first magnet results in a restoring force upon the shaft, and the shaft and the second magnet are removable from the joystick surface.
    Type: Grant
    Filed: August 1, 2016
    Date of Patent: August 14, 2018
    Assignee: ALLEGRO MICROSYSTEMS, LLC
    Inventors: Ali Husain Yusuf Sirohiwala, William P. Taylor, Katherine Shamberger
  • Patent number: 9927431
    Abstract: A biosensor includes a magnetic structure having grooved surface to biologically bond magnetic labels to a biological substance within the grooves. The grooves are positioned within the magnetic structure so that stray magnetic fields from the magnetic structure magnetize magnetic labels within the groove. The magnetic labels may be magnetic nanoparticles or magnetic microbeads. The techniques may reduce or eliminate the usage of any external magnetic field generator, e.g., electromagnets or current lines.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: March 27, 2018
    Assignee: Regents of the University of Minnesota
    Inventors: Jian-Ping Wang, Yuanpeng Li, Wang Yi
  • Patent number: 9905099
    Abstract: A proximity sensor comprises a magnet which generates a magnetic field and a magnetic field sensor. The magnetic field sensor includes a radio and an antenna which can transmit an output signal on a plurality of output frequencies. A microprocessor is programmed with a plurality of data protocols. Each of the output frequencies operates on at least one of the data protocols. There is a dip switch which is actuated to provide a code to the microprocessor. A data protocol is implemented by the microprocessor based on the code. There is a MEMS oscillator programmed to a discrete frequency based on the data protocol implemented by the microprocessor. The MEMS oscillator provides the discrete frequency to the radio. The radio is provided with single phase-locked loop which generates the output signal based on the discrete frequency. The single phase-locked loop may be a ×32 multiplier.
    Type: Grant
    Filed: July 27, 2015
    Date of Patent: February 27, 2018
    Assignee: 1010210 B.C. Ltd.
    Inventors: Julian Paul Carlson, Dean David Schebel
  • Patent number: 9869565
    Abstract: A magnet for detection mounted on a rotating shaft rotating about a rotation axis, and a detector disposed opposite to the magnet for detection to detect rotation of the rotating shaft are included. The detector includes a multi-layer circuit board, a recessed groove that is provided in an interlayer of the circuit board, has a center on an extension of the rotation axis, and is orthogonal to the rotation axis, a combined magnetic wire incorporated in the recessed groove and exhibiting a large Barkhausen effect, and a pickup coil formed of wiring conductors on the circuit board and a conductor with which through holes are filled, to surround the combined magnetic wire.
    Type: Grant
    Filed: April 23, 2015
    Date of Patent: January 16, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takeshi Musha, Yoshinao Tatei, Yoshimasa Watanabe
  • Patent number: 9863939
    Abstract: Methods for analyte detection with magnetic sensors are provided. Aspects of the methods include producing a magnetic sensor device having a magnetically labeled analyte from a sample, such as a serum sample, bound to a surface of a magnetic sensor thereof; and obtaining a signal, e.g., a real-time signal, from the magnetic sensor to determine whether the analyte is present in the sample. Also provided are devices, systems and kits that find use in practicing the methods of the invention. The methods, devices, systems and kits of the invention find use in a variety of different applications, including detection of biomarkers, such as disease markers.
    Type: Grant
    Filed: September 19, 2008
    Date of Patent: January 9, 2018
    Assignees: MagArray, Inc., The Board of Trustees of the Leland Stanford Junior University
    Inventors: Shan X. Wang, Sebastian J. Osterfeld, Heng Yu, Nader Pourmand, Robert L. White
  • Patent number: 9810748
    Abstract: A tunneling magneto-resistor (TMR) device for sensing a magnetic field includes a first TMR sensor having a first MTJ (magnetic tunneling junction) device and a second MTJ device connected in parallel. Each of the first and second MTJ devices has a pinned layer and a free layer. The pinned layer of each of the first and second MTJ devices has a pinned magnetization at a first pinned direction. The free layers of the first and second MTJ devices have a first free magnetization parallel to and a second free magnetization anti-parallel to a first easy-axis respectively.
    Type: Grant
    Filed: December 11, 2015
    Date of Patent: November 7, 2017
    Assignee: Industrial Technology Research Institute
    Inventors: Keng-Ming Kuo, Ding-Yeong Wang
  • Patent number: 9784769
    Abstract: A current sensor includes: a U-shaped core as a magnetic body; a conductor inserted into a slit of the core; and a detection element arranged in the slit of the core and detecting a magnetic field, wherein the core includes recessed portions on both side surfaces facing the detection element and the recessed portions have wall portions intersecting with at least an insertion direction of the conductor.
    Type: Grant
    Filed: November 23, 2015
    Date of Patent: October 10, 2017
    Assignee: AISIN SEIKI KABUSHIKI KAISHA
    Inventors: Takaaki Miyakoshi, Noriaki Fujita, Shinsuke Fushimi
  • Patent number: 9741246
    Abstract: A system determines traffic information. The system contains a terminal having a position determination device for determining a position of the vehicle, a storage device for storing reference positions defined by location coordinates, and a processor which works together with the position determining device and the storage device. The processor compares a specific position of the vehicle with stored reference positions to determine whether the vehicle has passed a reference position. A reference position is defined by a safety line extending through the location coordinates thereof. The processor also determines whether the vehicle has traversed a safety line and evaluates the traversing of a determined safety line as the vehicle passes the reference position defined by the safety line. Therefore, the system can determine a position in a simple and reliable manner, including in an inner-city road network.
    Type: Grant
    Filed: August 20, 2014
    Date of Patent: August 22, 2017
    Assignee: Siemens Aktiengesellschaft
    Inventors: Peter Aicher, Wilke Reints
  • Patent number: 9645204
    Abstract: A magnetic sensor for sensing an external magnetic field includes first and second electrodes and first and second magnetic tunneling junctions. The first and second electrodes are disposed over a substrate; and the first and second magnetic tunneling junctions are conductively disposed between the first and second electrodes and connected in parallel between the first and second electrodes. The first and second magnetic tunneling junctions are arranged along a first easy axis of the magnetic sensor. The first magnetic tunneling junction includes a first pinned magnetization and a first free magnetization, and the second magnetic tunneling junction includes a second pinned magnetization and a second free magnetization. The first free magnetization and the second free magnetization are arranged substantially in parallel to the first easy axis and in substantially opposite directions.
    Type: Grant
    Filed: December 20, 2012
    Date of Patent: May 9, 2017
    Assignee: Industrial Technology Research Institute
    Inventors: Young-Shying Chen, Cheng-Tyng Yen
  • Patent number: 9591711
    Abstract: A luminaire can comprise a system that automatically adjusts light output from the luminaire to control light level in an illuminated area. The system can increase light output if the light level in the area falls below a target light level or decrease light output if the light level in the area rises above the target. For example, when the area is illuminated by a combination of sunlight and luminaire light, the light level can be maintained at the target level by gradually decreasing light output as the sunlight contribution increases in the morning and by gradually increasing light output as the sunlight contribution decreases in the evening. The system adjustments can take into consideration whether the light level is offset from the target due to a change in the target or a short-term fluctuation that may be due to a cloud temporarily blocking the sun.
    Type: Grant
    Filed: December 11, 2015
    Date of Patent: March 7, 2017
    Assignee: Cooper Technologies Company
    Inventors: Michael Alan Lunn, Brian Eugene Elwell
  • Patent number: 9549688
    Abstract: A detection unit and a method for detecting an implanted medical device in an MRI environment employ a telemetry transmission from the implanted medical device.
    Type: Grant
    Filed: April 24, 2006
    Date of Patent: January 24, 2017
    Assignee: Medtronic, Inc.
    Inventor: Volkert A. Zeijlemaker
  • Patent number: 9545296
    Abstract: A digital face bow system for capturing a patient's dento-facial characteristics by acquiring and registering data defining the tilt or slant of the occlusal or incisal plane of a patient's teeth in three planes of space in relation to the cranium, head and/or face. The system includes a substrate adapted to support bite registration material, and a digital multiple axis inclinometer coupled to the substrate for registering the orientation of the occlusal or incisal plane, where the midline of the patient's horizontal-facial plane is registered. An adjustable mounting platform is adapted to receive the substrate and replicate the inclination registered by the digital multiple axis inclinometer.
    Type: Grant
    Filed: August 4, 2014
    Date of Patent: January 17, 2017
    Inventor: Stephen R Hansen
  • Patent number: 9494621
    Abstract: A single point detecting current sensor includes a plurality of magnetic sensor modules, wherein a magnetic sensor module is installed onto each busbars with an insulation displacement contact or is installed adjacent to each busbar, and outputs the current through a busbars measured by a magnetic sensor; a signal collection module collecting measured signals output by the plurality of magnetic sensor modules; and a signal interference compensation module deriving a corrected current value for which interference has been removed, by calculating the mutual interference between said busbars using the signals collected by said signal collection module.
    Type: Grant
    Filed: March 25, 2014
    Date of Patent: November 15, 2016
    Assignee: RETIGRID CO., LTD.
    Inventors: Jong Chan Yoon, Young Ho Ahn
  • Patent number: 9436215
    Abstract: A device to detect and quantify a force applied on a surface includes a test specimen, an electrically insulating substrate, a first electrode bound to the substrate, a second electrode, an assembly of conductive or semi-conductive nanoparticles in contact with the two electrodes, and a measurement device. The measurement device provides proportional information with respect to an electrical property of the nanoparticles assembly. The electrical property is measured between the first and second electrode. The test specimen is the nanoparticles assembly itself and the electrical property is sensitive to the distance between the nanoparticles of the assembly. The nanoparticles assembly itself is used as a test specimen and allows a force to be quantified even if the nanoparticles assembly is deposited on a rigid substrate.
    Type: Grant
    Filed: June 9, 2015
    Date of Patent: September 6, 2016
    Assignee: NANOMADE CONCEPT
    Inventors: Benoît Viallet, Laurence Ressier, Jérémie Grisolia, Lionel Songeon, Eric Mouchel La Fosse, Lukas Czornomaz
  • Patent number: 9423280
    Abstract: A sensor includes at least a housing (3) which encloses a housing interior (6), a printed circuit board (8) and a sensing element (10). The printed circuit board (8) has electronic components (9) and is located within the housing interior (6). The sensing element (10) is electrically connected to the printed circuit board (8) and is located within the housing interior (6). The sensing element (10) is frictionally connected to the housing (3) so that the sensing element (10) is held in position in the housing interior (6).
    Type: Grant
    Filed: July 24, 2013
    Date of Patent: August 23, 2016
    Assignee: Baumer Electric AG
    Inventors: Mathias Schwendimann, Erich Hohloch
  • Patent number: 9410948
    Abstract: A microfluidic device, used with a processing device having a magnetic supplier, including a chamber arranged to receive a biological sample and at least one magnetic particle, and a storage for storing information comprising a magnetic protocol in a form readable by the processing device. The magnetic supplier is configured to generate magnetic forces on the magnetic particle(s) according to this magnetic protocol read from the storage.
    Type: Grant
    Filed: March 19, 2010
    Date of Patent: August 9, 2016
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventor: Wendy U. Dittmer
  • Patent number: 9360294
    Abstract: Among other things, the disclosure features a system comprising a sensor, a DC magnetic field source, an AC magnetic field source, and a receiver. The sensor has an aspect ratio of 10:1 or higher and comprises a ferromagnetic material. The ferromagnetic material has a non-linear magnetization response, and the response contains a maximum point of non-linearity. The DC magnetic field source is adjustable for providing a magnetic excitation field to excite a magnetic field within the sensor. The provided magnetic excitation field has a range such that the excited magnetic field within the sensor is near the maximum point of non-linearity. The AC magnetic field source is configured to generate an AC magnetic field to cause the sensor to generate even harmonics. The receiver is configured to receive the even harmonics from the sensor for determining a position of the sensor.
    Type: Grant
    Filed: October 31, 2013
    Date of Patent: June 7, 2016
    Assignee: Ascension Technology Corporation
    Inventor: Westley S. Ashe
  • Patent number: 9335378
    Abstract: A flexible magnetic coil for determining ion migration rates inside a vacuum device can include a plurality of insulated copper wires held together as a bundle. A positive pole can be connected to a first end of the bundle for receiving a positive DC voltage. A negative pole can be connected to a second end of the bundle for completing a circuit with the positive pole. A DC voltage ranging from ten volts to four thousand volts from a power supply can be connected to the positive pole, the negative pole, or combinations thereof. The bundle can be a loop and can form a circuit when the DC voltage is applied to the loop. The bundle can create a flexible electromagnetic field of at least one Gauss around the vacuum device using a calculation of a number of turns of insulated copper wire multiplied by applied DC current.
    Type: Grant
    Filed: April 25, 2012
    Date of Patent: May 10, 2016
    Inventor: Finley Lee Ledbetter
  • Patent number: 9316501
    Abstract: Disclosed is an apparatus caused to acquire information indicating a measured magnetic field vector and information relating to an uncertainty measure of the measured magnetic field vector in at least one known location inside the building, wherein the indicated magnetic field vector represents magnitude and direction of the earth's magnetic field affected by the local structures of the building, and to generate the indoor magnetic field map for at least part of the building on the basis of at least the acquired information and the floor plan.
    Type: Grant
    Filed: June 9, 2014
    Date of Patent: April 19, 2016
    Assignee: INDOORATLAS OY
    Inventor: Janne Haverinen
  • Patent number: 9239221
    Abstract: The present disclosure relates to a proximity sensor having a coil (15) for generating a magnetic field and a sensor circuit (62) for detecting variations of the magnetic field caused by an external object, the sensor circuit (62) comprising at least one semiconductor component (36, 37, 67, 69, 70, 71) mounted on a circuit board (17), wherein the coil (15) and the circuit board (17) are arranged in a housing (2) through which the magnetic field is transmittable. In order to improve the resistance of the proximity sensor against harmful external influences, such as high temperatures, and to prolong its life cycle, the invention suggests that the semiconductor component (36, 37, 67, 69, 70, 71) is included in an enclosure (20) that is hermetically sealed and fixed on a surface (18, 19) of the circuit board (17).
    Type: Grant
    Filed: October 23, 2013
    Date of Patent: January 19, 2016
    Assignee: OPTOSYS SA
    Inventor: Peter Heimlicher
  • Patent number: 9080874
    Abstract: There is provided an apparatus caused to acquire information indicating a measured magnetic field vector and information relating to an uncertainty measure of the measured magnetic field vector in at least one known location inside the building, wherein the indicated magnetic field vector represents magnitude and direction of the earth's magnetic field affected by the local structures of the building, and to generate the indoor magnetic field map for at least part of the building on the basis of at least the acquired information and the floor plan.
    Type: Grant
    Filed: January 3, 2013
    Date of Patent: July 14, 2015
    Assignee: INDOORATLAS OY
    Inventor: Janne Haverinen
  • Patent number: 9068440
    Abstract: Explosion-proof magnetic flux leakage inspection apparatus for well tubing includes a hermetically sealed interior chamber with an inner wall assembly that forms and surrounds a central channel in a manner that separates the central channel from the hermetically sealed interior chamber by the inner wall assembly. The central channel has an open top and an open bottom to accommodate passage of the well tubing through the central channel. An electromagnetic coil, magnetic flux leakage detector assembly, and a shallow reading detector assembly are positioned in the hermetically sealed interior chamber around the inner wall assembly.
    Type: Grant
    Filed: June 15, 2012
    Date of Patent: June 30, 2015
    Inventor: William Lauf
  • Patent number: 9030193
    Abstract: A system by which the proportion of ferromagnetic particles in a dielectric medium is measured. A magnetic field is generated by two signals in the medium: a low frequency feed and a relatively high frequency excitation. The feed magnetizes the ferromagnetic particles in the medium to the nonlinear range of the magnetization curve. The excitation is generated so that its spectrum is relatively wide and it is dense with frequency components. The level of the excitation is so high that the magnetic flux density in the medium corresponding to the excitation fluctuates nonlinearly, when the feed is at its peak value or near this. The magnetic field of the medium is measured by a secondary winding, and from the response signal produced by the sensor is detected the part resulting from the magnetic non-linearity, which part is the output signal. In the detection the response is multiplied by the signal, which arises magnetic field and includes the same random fluctuation as the response.
    Type: Grant
    Filed: January 19, 2011
    Date of Patent: May 12, 2015
    Assignee: Hemeltron
    Inventor: Arvi Kruusing
  • Patent number: 9024631
    Abstract: An apparatus, method and computer-readable medium configured to transport a constituent of fluid sample that binds to a functionalized magnetic particle. The apparatus includes a substrate connected to an input port, a magnetic nanowire, and either a temporally changing magnetic field generator or a spin-polarized current source. The magnetic nanowire is disposed in a surface of the substrate. The width and thickness of the magnetic nanowire are configured so that a domain wall propagating along the nanowire in response to the temporally changing magnetic field continuously couples to a superparamagnetic particle introduced into the input port.
    Type: Grant
    Filed: November 15, 2011
    Date of Patent: May 5, 2015
    Assignee: Massachusetts Institute of Technology
    Inventors: Geoffrey Stephen Beach, Elizabeth Ashera Rapoport
  • Patent number: 9000764
    Abstract: A method for producing printed magnetic functional elements for resistance sensors and printed magnetic functional elements. The invention refers to the field of electronics and relates to a method for producing resistance sensors, such as can be used, for example, in magnetic data storage for read sensors or in the automobile industry. The disclosure includes a simple and cost-effective production method and to obtain such printed magnetic functional elements with properties that can be adjusted as desire, in which a magnetic material is deposited onto a substrate as a film, is removed from the substrate and divided into several components and these components are applied on a substrate by means of printing technologies. Aspects are also directed to a printed magnetic functional element for resistance sensors of several components of a film, wherein at least 5% of the components of the functional element have a magnetoimpedance effect.
    Type: Grant
    Filed: June 20, 2012
    Date of Patent: April 7, 2015
    Assignee: Leibniz-Institut fuer Festkoerper und Werkstoffforschung Dresden e.V.
    Inventors: Daniil Karnaushenko, Denys Makarov, Oliver G. Schmidt
  • Patent number: 9002675
    Abstract: A method and system for locating the position of a source that emits a rotating magnetic field. Three or more receivers are deployed or positioned in known position relative to each other, which may be along a common axis in some cases. Phase differences between the magnetic fields measured by the receivers are detected. The phase shifts are used to determine the location of the source. With three receivers, a range and bearing angle relative to a middle receiver may be determined. With five or more receivers, a range and two bearing angles may be determined, thereby providing a three-dimensional position.
    Type: Grant
    Filed: February 23, 2012
    Date of Patent: April 7, 2015
    Assignee: Ultra Electronics Maritime Systems Inc.
    Inventors: Graham Mark McIntyre, Sebastien Bourdage, Olivier Beslin, Jean Pierre Quirion
  • Patent number: 8994370
    Abstract: The invention relates to an integrated sensor, including terminals (1, 2) for connection to an electric generator, said terminals being connected to a metal measuring line (4, 5) in which a current proportional to the voltage or current of the generator to be measured flows, and magnetoresistors (31, 32, 33, 34). The metal measuring line includes elongate and parallel sections (4, 5) in which the current flows in opposite directions, said sections being connected to a portion (3) for closing the metal measuring line (3, 4, 5), which is arranged on a galvanic isolation layer (8) that is in turn arranged on an integrated circuit portion including the magnetoresistors (31, 32, 33, 34), each of which have a sensitive portion that is vertically adjacent to one of the elongate sections (4, 5). The sensor can be integrated into a diagnostic system.
    Type: Grant
    Filed: July 28, 2011
    Date of Patent: March 31, 2015
    Assignees: Peugeot Citroën Automobiles SA, Commissariat a l'energie Atomique et aux Energies Alternatives
    Inventors: Myriam Pannetier-Lecoeur, Claude Fermon, Alain Giraud, Francis Roy
  • Patent number: 8994376
    Abstract: This method for detecting a disturber of magnetic field amplitude comprises: the emitting (62) of several magnetic fields of different frequencies from a same uniaxial magnetic field source, the amplitudes of the magnetic field emitted at two different unspecified frequencies being related to each other by a predetermined ratio, the measurement (64) of the amplitude of these magnetic fields at different frequencies by means of a same sensor, and the reporting (70) of an amplitude disturber if a ratio between two of said measured amplitudes diverges from a predetermined threshold of the predetermined ratio which relates the amplitudes of the magnetic fields emitted at the same frequencies and, if not, the absence of any reporting.
    Type: Grant
    Filed: May 6, 2010
    Date of Patent: March 31, 2015
    Assignee: Commissariat a l'Energie Atomique et aux energies alternatives
    Inventors: Malvina Billeres, Viviane Cattin
  • Patent number: 8981773
    Abstract: A magnetic-field sensor adapted to detect an external magnetic field. The magnetic-field sensor including a first chip, having a first magnetoresistive structure for detection of the external magnetic field, the first magnetoresistive detection structure including an electrical-contact pad and magnetoresistive element, and a second chip housing an integrated electronic circuit and a magnetic-field generator. The first and second chips being mutually arranged in such a way that the integrated electronic circuit can be electrically coupled to the electrical-contact pad of the magnetoresistive structure and in such a way that the magnetic-field generator can be magnetically coupled to the magnetoresistive structure.
    Type: Grant
    Filed: December 27, 2011
    Date of Patent: March 17, 2015
    Assignee: STMicroelectronics S.r.l.
    Inventors: Enrico Pozzati, Fabio Bottinelli, Carlo Alberto Romani
  • Patent number: 8970373
    Abstract: A door, or window detector incorporates a magnet and a magnetometer. Dual loop processing can be provided for real-time signals from the magnetometer, as the magnet moves relative to it, to determine when at least one of small gap or large gap indicating alarms should be issued. Security can be substantially increased by randomizing the orientation of the magnet.
    Type: Grant
    Filed: April 9, 2012
    Date of Patent: March 3, 2015
    Assignee: Honeywell International Inc.
    Inventors: Mark C. Buckley, Dave Eugene Merritt
  • Patent number: 8941379
    Abstract: Systems and methods for detecting electromagnetic waves are disclosed. A system for use in detecting an electromagnetic wave includes an inductive device and a spintronic device. The inductive device generates an induced electromagnetic field when the inductive device receives the electromagnetic wave. The spintronic device has an impedance that changes when exposed to the induced electromagnetic field from the inductive device. The change in impedance is indicative of the electromagnetic wave received by the inductive device. Another system for use in detecting or transmitting an electromagnetic wave includes a conductive device and an inductive device. The inductive device is configured to generate an induced electromagnetic wave when the inductive device receives an electromagnetic wave passed by the conductive device. Another system for detecting electromagnetic wave permittivity or permeability of an object includes a pair of antennas and an inductive device.
    Type: Grant
    Filed: February 18, 2011
    Date of Patent: January 27, 2015
    Assignee: University of Delaware
    Inventors: John Q. Xiao, Xin Fan
  • Patent number: 8937474
    Abstract: The disclosure relates to a magnetometer in which direction of the Earth's magnetic field is determined on the basis of time variant differences in the inductance of a sensor coil of the digital compass which is a function of the orientation of the sensor coil with respect to the Earth's magnetic field. The magnetometer includes a sensing coil, a feedback resistor, and a comparator.
    Type: Grant
    Filed: March 31, 2011
    Date of Patent: January 20, 2015
    Assignee: Johnson Controls Technology
    Inventors: Theron J. Hicks, Jason L. Reene, Thomas Wright
  • Patent number: 8922341
    Abstract: A method of authentication of a terminal generating a magnetic field by a transponder including an oscillating circuit from which a D.C. voltage is generated, wherein at least one quantity depending on the coupling between the transponder and the terminal is compared with at least one reference value.
    Type: Grant
    Filed: May 22, 2013
    Date of Patent: December 30, 2014
    Assignee: STMicroelectronics (Rousset) SAS
    Inventor: Luc Wuidart
  • Patent number: 8922208
    Abstract: An active device is provided that is energized by an optical source and uses an active paramagnetic medium to transfer this energy to a resonant circuit enabling new classes of electronic components.
    Type: Grant
    Filed: April 16, 2010
    Date of Patent: December 30, 2014
    Assignee: Euclid Techlabs LLC
    Inventors: Alexei Kanareykin, Paul Schoessow, Sergey Antipov, Oleg Poluektov
  • Patent number: 8912789
    Abstract: A magnetic force microscope capable of measuring the absolute value of a magnetic field with high resolution without causing a change in magnetization state of the probe. The magnetic force microscope includes a cantilever, a probe, a displacement detector that detects a displacement of the probe, a specimen carrier, and various transfer units. The magnetic force microscope that measures an undulation distribution as well as a magnetic field distribution on the surface of a specimen placed on the specimen carrier is further provided with a magnetic-field impress-unit that impresses a magnetic field to the probe, and an output of the magnetic-field impress-unit is controlled such that a magnetic force impressed onto the probe 5 is turned zero to thereby measure a magnetic field distribution on the surface of the specimen.
    Type: Grant
    Filed: May 24, 2012
    Date of Patent: December 16, 2014
    Assignee: Hitachi, Ltd.
    Inventor: Seiji Heike
  • Patent number: 8890519
    Abstract: A printed circuit in which, in going from one end to another, a same conductive line is wound successively: around the first winding axis to form at least one half-turn of a first coil, then around the second winding axis to form at least one half-turn of a second coil, then around the first winding axis to form at least one half-turn of a first coil, then around the second winding axis to form at least one half-turn of a second coil.
    Type: Grant
    Filed: September 7, 2012
    Date of Patent: November 18, 2014
    Assignee: Commissariat a l'energie atomique et aux energies alternatives
    Inventor: Philippe Klein
  • Patent number: 8886282
    Abstract: A system and method for measuring a magnetocardiogram (MCG) in order to measure a weak magnetic field generated from the heart of a small animal such as a laboratory rat are provided. The system includes a case, a SQUID sensor located and fixed inside the case to detect magnetism, a platform arranged near the SQUID sensor inside the case, the small animal being placed on the platform, a linear station to which the platform is fixed to move a location of the platform, and a control unit configured to control operations of the SQUID sensor and the linear station and measure the MCG of the small animal using intensities of the magnetism detected by the SQUID sensor.
    Type: Grant
    Filed: March 9, 2010
    Date of Patent: November 11, 2014
    Assignee: Korea Research Institute of Standards and Science
    Inventors: In Seon Kim, Yong Ho Lee, Ki Woong Kim
  • Patent number: 8878689
    Abstract: A meter reader for reading a meter have a display portion displaying a total output of a quantity being metered and plural incremental outputs defining the total output. The meter reader includes a sensing mechanism for sensing one of the plural incremental outputs in the meter display portion, and a processing unit coupled to the sensing mechanism for accumulating incremental outputs sensed by the sensing mechanism and for determining accumulated meter output over a time period based on the accumulated incremental outputs. Also included is an output mechanism for outputting the accumulated meter output determined by the processing unit. In one example, the sensing mechanism includes a sensor for sensing only a least significant incremental output in usage included in the meter display portion, and an emitter for illuminating the least significant incremental output included in the meter display portion.
    Type: Grant
    Filed: March 5, 2007
    Date of Patent: November 4, 2014
    Assignee: Sensus Spectrum LLC
    Inventor: Hugh Britton Sanderford
  • Patent number: 8872513
    Abstract: Disclosed are a medium discrimination apparatus and a discrimination method thereof. The medium discrimination apparatus comprises first and second magnetic sensor, a differential analog/digital converter and a controller. The first magnetic sensor senses a magnetic component printed at a specific position of an introduced medium and having a form of an analog signal containing a first noise generated from an internal circuit and a second noise generated from an operation of an actuator. The second magnetic sensor senses the first and second noises which are caused when the medium is transferred and has a form of an analog signal. The differential analog/digital converter performs a subtraction operation for the first and second noises sensed by the first and second magnetic sensors and convert result signals into one digital signal. The controller determines if the introduced medium is genuine or counterfeit according to the digital signal.
    Type: Grant
    Filed: June 24, 2009
    Date of Patent: October 28, 2014
    Assignee: LG CNS Co., Ltd.
    Inventors: In-Uk Kim, Seoung-Oh Han
  • Patent number: 8872519
    Abstract: One exemplary embodiment includes a method including providing a battery, producing a first magnetic field so that a second magnetic field is induced in the battery, sensing a magnetic field resulting from the interaction of the first magnetic field and the second magnetic field, utilizing the sensed net magnetic field to determine the state of charge of the battery.
    Type: Grant
    Filed: August 21, 2009
    Date of Patent: October 28, 2014
    Assignee: GM Global Technology Operations LLC
    Inventors: Gregory P. Meisner, Jan F. Herbst, Mark W. Verbrugge
  • Patent number: 8847586
    Abstract: A magnetic sensor inspection apparatus has a rectangular frame including a stage, a probe card, and a plurality of magnetic field generating coils. A wafer-like array of magnetic sensors is mounted on the stage, which is movable in horizontal and vertical directions. The probe card includes a plurality of probes which are brought into contact with a plurality of magnetic sensors encompassed in a measurement area. The magnetic field generating coils are driven to generate a magnetic field toward the stage. A plurality of magnetic field environment measuring sensors is arranged in the peripheral portion of the probe card surrounding the probes. A magnetic field controller controls magnetic fields generated by the magnetic field generating coils based on the measurement result of the magnetic field environment measuring sensors. Thus, it is possible to concurrently inspect a wafer-like array of magnetic sensors with the probe card.
    Type: Grant
    Filed: August 8, 2012
    Date of Patent: September 30, 2014
    Assignee: Yamaha Corporation
    Inventor: Takashi Suzuki
  • 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
  • Patent number: 8816683
    Abstract: Magnetic field sensing method and apparatus of this disclosure uses two tunneling magneto-resistor (TMR) devices. Angles of the free magnetizations of the two TMR devices with respect to a fixed direction are set in a first to fourth period. In the first to fourth period, the two TMR devices act as a TMR sensing unit and a zero-field reference unit by turns, and each of the conductance difference between the sensing unit and the zero field reference unit is also obtained in each of the first to fourth period. Finally, the four conductance differences are summed up.
    Type: Grant
    Filed: July 13, 2012
    Date of Patent: August 26, 2014
    Assignee: Industrial Technology Research Institute
    Inventors: Ding-Yeong Wang, Young-Shying Chen, Keng-Ming Kuo
  • Publication number: 20140225606
    Abstract: Provided are an inspection device and an inspection method capable of achieving improved magnetic field sensitivity by using a magnetic thin film of a small film thickness. A light-emitting unit 1 emits light of a first wavelength for acquiring magnetic field inspection information and a second wavelength for acquiring inspection object surface information. A selection unit 6 selects information from an inspection object 4 and information from a magnetophotonic crystal film 3 acquired by light irradiation performed by an irradiation unit 2. An image generation unit 9 generates image data based on the magnetic field inspection information acquired with the first wavelength and the inspection object surface information acquired with the second wavelength selected by the selection unit. Each of the generated image data is displayed on a display unit 10.
    Type: Application
    Filed: February 11, 2014
    Publication date: August 14, 2014
    Applicant: Hitachi, Ltd.
    Inventors: Hisashi ENDO, Soshi NARISHIGE, Mitsuteru INOUE, Hiroyuki TAKAGI
  • Patent number: 8797023
    Abstract: Provided is a coercive-force specifying apparatus capable of creating a demagnetization curve for each divisional area of a coercive-force distributed magnet without breaking the coercive-force distributed magnet and of specifying an average coercive force for each divisional area precisely. A coercive force specifying apparatus of the present invention includes: a yoke including an insertion space into which a coercive-force distributed magnet is to be inserted; a magnetizing coil; a search coil that detects a magnetization change when the magnetic field is applied to the coercive-force distributed magnet; and a tracer that creates a demagnetization curve on a basis of a voltage value generated due to the magnetization change. The end face is provided with two or more loop-shaped thread grooves bored therein, the search coil being provided in each thread groove.
    Type: Grant
    Filed: March 7, 2011
    Date of Patent: August 5, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Masafumi Suzuki, Tomonari Kogure, Mayumi Nakanishi
  • Patent number: 8773113
    Abstract: Cyclic motion of a ferromagnetic part in an environment made noisy by at least one electric source with an A.C. component is measured using at least one first magnetometer sensitive to the moving part and a sensor of an image of current in the electric source. An estimate is calculated of noise linked to the electric source on a signal measured by the first magnetometer and then subtracted from the measured signal.
    Type: Grant
    Filed: January 18, 2011
    Date of Patent: July 8, 2014
    Assignee: Commissariat a l'Energie Atomique et aux Energies Alternatives
    Inventors: Alexis Le Goff, Roland Blanpain