Linear Patents (Class 324/207.24)
  • Patent number: 10378923
    Abstract: A sensor arrangement for position sensing comprises a row of multiple magnetoresistive elements. A magnetic field source (3) provides a magnetic field with a first magnetic pole (N) and a second magnetic pole (S). The magnetic field source (3) is arranged such that magnetoresistive elements of the row face one of: the first magnetic pole (N) or second magnetic pole (S). The first magnetoresistive element is arranged in the magnetic field and provides a first output signal dependent on a position of the magnetoresistive element relative to the magnetic field source (3). A measurement unit is configured to determine a position of the magnetic field source (3) relative to the magnetoresistive elements of the row dependent on the first output signals of the magnetoresistive elements.
    Type: Grant
    Filed: December 27, 2017
    Date of Patent: August 13, 2019
    Assignee: International Business Machines Corporation
    Inventors: Walter Haeberle, Angeliki Pantazi, Abu Sebastian, Tuma Tomas
  • Patent number: 10371202
    Abstract: Provided is a rolling guide device which is capable of directly recognizing an operation condition of a moving member with respect to a track member or a circulation state of rolling elements in an endless circulation path, the rolling guide device including: a track member having a rolling surface; and a moving member, which is assembled to the track member through intermediation of a large number of rolling elements which roll on the rolling surface, and has an endless circulation path for the rolling elements, the moving member including: a main body member having a load rolling surface and a no-load return path for the rolling elements, the load rolling surface being opposed to the rolling surface of the track member to define a load path for the rolling elements, a pair of covers, which have direction change paths for allowing the rolling elements to move between the load path and the no-load return path, and is mounted to the main body member; and a measurement plate, which is interposed at least betwee
    Type: Grant
    Filed: January 11, 2017
    Date of Patent: August 6, 2019
    Assignee: THK CO., LTD.
    Inventors: Kaoru Hoshide, Toshiro Tojo, Yoshiyuki Honjo, Ryuji Furusawa, Ayako Miyajima
  • Patent number: 10352680
    Abstract: Magnetoquasistatic through-the-wall non-line-of-sight coupling between a mobile transmitting device located within a building, or indoor, and a fixed receiving device located outside the building, outdoor, enables positioning of the transmitting device through the wall of the building and in non-line-of-sight environments. Systems based on magnetoquasistatic coupling can separately sense the distance and orientation of the transmitting device accurately even in heavy non-line-sight environments such as steel-reinforced buildings. The approach permits sensing and determination of location and attitude of mobile devices in buildings and can be used to locate rescue workers, first responders, or law enforcement officers inside a building.
    Type: Grant
    Filed: October 31, 2016
    Date of Patent: July 16, 2019
    Assignee: CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventor: Darmindra D. Arumugam
  • Patent number: 10260906
    Abstract: A rotary encoder for measuring absolute rotation around an axis of the rotary encoder, comprising: a magnetised element comprising first and second surfaces at an angle to one another; a first magnetic track provided on the first surface and a second magnetic track provided on the second surface, wherein the first and second magnetic tracks subtend an angle ? around the axis of the rotary encoder, wherein each magnetic track comprises a number of magnetic pole pairs, a magnetic pole pair being formed of two poles defining regions of opposite magnetic polarization, wherein the number of magnetic pole pairs in each track are different and have a greatest common factor of one; and first and second magnetic sensor arrangements, the first magnetic sensor arrangement arranged to detect a magnetic field of the first magnetic track and the second magnetic sensor arrangement arranged to detect a magnetic field of the second magnetic track, wherein the magnetic sensor arrangements are rotatably coupled to the magnetise
    Type: Grant
    Filed: November 27, 2015
    Date of Patent: April 16, 2019
    Assignee: Imperial Innovations Limited
    Inventors: Jindong Liu, Guang-Zhong Yang
  • Patent number: 10197074
    Abstract: There is provided an actuator that can prevent a decrease in strength of a plate due to hydrolysis. The actuator is provided with a diaphragm which divides an inside of a casing into a negative pressure chamber and an atmospheric pressure chamber, a resin plate which is provided inside the negative pressure chamber to contact with the diaphragm, and an operating shaft having one side connected to the plate and the diaphragm and the other side extended outside the casing through the atmospheric pressure chamber, the operating shaft capable of being displaced in the axial direction according to the deformation of the diaphragm. The operating shaft penetrates through the diaphragm to connect to the plate inside the negative pressure chamber so that the plate is blocked from the atmospheric pressure chamber.
    Type: Grant
    Filed: July 10, 2015
    Date of Patent: February 5, 2019
    Assignees: Taiho Kogyo Co., Ltd., Toyota Jidosha Kabushiki Kaisha
    Inventors: Kuninori Matsui, Akitoshi Iwata, Koichi Yonezawa
  • Patent number: 10066964
    Abstract: A magnetic field sensor, a magnetic assembly, and a method provide circuits and techniques for or measuring one or more displacement angles of a magnet using magnetic field sensing elements. Applications include, but are not limited to, joysticks.
    Type: Grant
    Filed: January 30, 2017
    Date of Patent: September 4, 2018
    Assignee: Allegro Microsystems, LLC
    Inventors: Ali Husain Yusuf Sirohiwala, James Rice
  • Patent number: 10066966
    Abstract: A magnetic position detection device configured to detect a relative movement position of a magnetic encoder, which includes N-magnetic poles and S-magnetic poles arranged alternately in a moving direction, by a magnetosensitive portion as a change in direction of a magnetic field from the encoder. As the magnetosensitive portion, direction detection type magnetoresistive elements are arranged, which each have a resistance value that changes depending on a direction of an applied magnetic field. The encoder further includes non-magnetized portions arranged at boundaries between the N-magnetic poles and the S-magnetic poles so that changes through the movement of the encoder of a magnetic-field component Bs in the moving direction of the encoder and a magnetic-field component Br in a direction in which the magnetosensitive portion and the encoder are opposed to each other, which are formed at a position of the magnetosensitive portion, are approximately sinusoidal.
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: September 4, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takafumi Hara, Fusako Tomizumi
  • Patent number: 9964419
    Abstract: A sensor arrangement for position sensing comprises a magnetic field source and a magnetoresistive element arranged in a magnetic field generated by the magnetic field source, which magnetoresistive element provides an output signal (R) dependent on a position (x) of the magnetoresistive element relative to the magnetic field source. A feedback controller is configured to receive the output signal (R) of the magnetoresistive element and is configured to adjust one or more of the position (x) of the magnetoresistive element relative to the magnetic field source and a strength of the magnetic field generated by the magnetic field source acting on the magnetoresistive element dependent on the output signal (R) of the magnetoresistive element.
    Type: Grant
    Filed: January 17, 2017
    Date of Patent: May 8, 2018
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Angeliki Pantazi, Abu Sebastian, Tomas Tuma
  • Patent number: 9945693
    Abstract: A method for determining of a position of an object using a sensor arrangement that includes a first magnetoresistive element and a second magnetoresistive element. A source provides a magnetic field with first and second magnetic poles. The source is arranged between the first magnetoresistive element and the second magnetoresistive element with the first magnetic pole facing the first magnetoresistive element and the second magnetic pole facing the second magnetoresistive element. The first magnetoresistive element is arranged in the magnetic field and provides a first output signal dependent on a position of the first magnetoresistive element relative to the magnetic field source. The second magnetoresistive element is arranged in the magnetic field and provides a second output signal dependent on a position of the second magnetoresistive element relative to the magnetic field source.
    Type: Grant
    Filed: August 13, 2015
    Date of Patent: April 17, 2018
    Assignee: International Business Machines Corporation
    Inventors: Walter Haeberle, Angeliki Pantazi, Abu Sebastian, Tuma Tomas
  • Patent number: 9927260
    Abstract: A sensor assembly for ascertaining the path of a moved part includes a magnetic measuring assembly and a fixed sensitive measure element. The magnetic measuring assembly has a magnetic field with at least one spatial component that is changed by the movement of the part along the path to be ascertained. The position of the moved part is detected in relation to the fixed sensitive measuring element. The magnetic field is generated by at least one effective magnet connected to the moved part, and at least one support magnet arranged in a fixed manner in the measuring region of the sensitive measuring element.
    Type: Grant
    Filed: February 25, 2015
    Date of Patent: March 27, 2018
    Assignee: Robert Bosch GmbH
    Inventors: Eduard Maiterth, Michael Kleinknecht, Mathias Kimmerle, Joerg Siedentopf
  • Patent number: 9927262
    Abstract: High-resolution multi-turn sensing apparatus and methods. A method can be implemented to sense a rotational position of a shaft having a longitudinal axis. Such a method can include determining a turn number of the shaft with a first magnet arranged in a non-contact manner with a first magnetic sensor to allow measurement of a linear position of the first magnet relative to the first magnetic sensor. The linear position can be representative of a turn number of the shaft. The method can further include determining an angular position of the shaft within a given turn with a second magnet positioned at an end of the shaft along the longitudinal axis and arranged relative to a second magnetic sensor. The method can further include combining the turn number with the angular position to generate one or more output signals representative of a measured rotational position of the shaft.
    Type: Grant
    Filed: March 14, 2017
    Date of Patent: March 27, 2018
    Assignee: Bourns, Inc.
    Inventors: Eugen Bogos, Perry Wehlmann, Christopher Couch
  • Patent number: 9846063
    Abstract: A linear encoder can have a mass embodiment having a position code marking, a read head having a calibration means, and a control and analysis unit, and calibration method for calibrating a position code made of code elements using the read head. The read head has a sensor unit having at least two detection reference points, the detection distance of which establishes at least one standard with high precision. In the scope of the calibration method, calibrated position values are prepared for code elements with the aid of the standard, which is determined with high precision, and are stored in the control and analysis unit.
    Type: Grant
    Filed: February 18, 2015
    Date of Patent: December 19, 2017
    Assignee: HEXAGON TECHNOLOGY CENTER GMBH
    Inventors: Urs Vokinger, Heinz Lippuner, Knut Siercks
  • Patent number: 9797417
    Abstract: The invention relates to a master brake cylinder arrangement with actuation detection for a motor vehicle braking system, having at least one piston arrangement with a piston, which is movably guided in a cylinder bore in a cylinder housing, said piston with the cylinder bore defining a pressure chamber which is fluidically coupled to a hydraulic brake circuit. During a forward stroke, the piston can be moved from a start position into a possible actuation piston along a movement axis, which coincides essentially with a longitudinal axis of the cylinder bore, and during a return stroke, said piston is moved from an actuation position into a start position. The piston is associated with a coupling element which is coupled to a position detecting rod for common movement therewith, said position detecting rod being moved essentially parallel to the first cylinder bore, the position of the position detecting rod can be detected by means of a position detecting sensor placed on the cylinder housing.
    Type: Grant
    Filed: November 14, 2013
    Date of Patent: October 24, 2017
    Assignee: LUCAS AUTOMOTIVE GMBH
    Inventors: Hans-Martin Giese, Torsten Petry, David Lopéz Larequi
  • Patent number: 9766095
    Abstract: A magnetized scale (1a) in which magnetic pole pairs each formed of a first magnetic portion (11a) and a second magnetic portion (12a) having different magnetic properties are arranged with a period of a magnetic pole pair width 2?, and a magnetosensitive device (2) in which n magnetosensitive elements (21a to 21e) are arranged with a magnetosensitive element pitch P so that ?=nP may be established are arranged so as to be opposed to each other with a predetermined air gap therebetween. Output values output from the n magnetosensitive elements (21a to 21e) in parallel are analyzed to calculate a relative position between the magnetosensitive device (2) and the magnetized scale (1a) as a position detection resolution of ?/n.
    Type: Grant
    Filed: April 23, 2013
    Date of Patent: September 19, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takafumi Hara, Yuji Kawano
  • Patent number: 9759578
    Abstract: A sensor arrangement for position sensing comprises a first magnetoresistive element (1) and a second magnetoresistive element (2). A magnetic field source (3) provides a magnetic field with a first magnetic pole (N) and a second magnetic pole (S). The magnetic field source (3) is arranged between the first magnetoresistive element (1) and the second magnetoresistive element (2) with the first magnetic pole (N) facing the first magnetoresistive element (1) and the second magnetic pole (S) facing the second magnetoresistive element (2). The first magnetoresistive element (1) is arranged in the magnetic field and provides a first output signal (R1) dependent on a position of the first magnetoresistive element (1) relative to the magnetic field source (3). The second magnetoresistive element (2) is arranged in the magnetic field and provides a second output signal (R2) dependent on a position of the second magnetoresistive element (2) relative to the magnetic field source (3).
    Type: Grant
    Filed: March 12, 2015
    Date of Patent: September 12, 2017
    Assignee: International Business Machines Corporation
    Inventors: Walter Haeberle, Angeliki Pantazi, Abu Sebastian, Tuma Tomas
  • Patent number: 9638521
    Abstract: Methods and systems for non-line-of-sight positioning are disclosed for arbitrarily short to long ranges, where positioning is achieved using a single anchor not requiring tri-/multi-lateration or tri-/multi-angulation. Magnetoquasistatic fields can be used to determine position and orientation of a device in two or three dimensions. Two or three axis coils can be used in receivers and transmitters. The magnetoquasistatic equations are solved in different scenarios, taking into consideration the image signals originating from the interaction between the fields and ground/earth.
    Type: Grant
    Filed: October 6, 2015
    Date of Patent: May 2, 2017
    Assignee: CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventor: Darmindra D. Arumugam
  • Patent number: 9541423
    Abstract: A magnetic encoder apparatus is presented that includes a plurality of magnetic sensor elements (e.g. Hall sensors) for reading an associated magnetic scale that produces a periodically repeating magnetic pattern. The plurality of magnetic sensor elements produce a plurality of sensor signals and an analyzer is provided for analyzing the plurality of sensor signals to provide a measure of the position of the magnetic sensor elements relative to the associated magnetic scale. The analyzer is arranged to use the plurality of sensor signals to assess the period of the periodically repeating magnetic pattern sensed by the plurality of magnetic sensor elements. In this manner, the requirement to carefully match the period of the sensor elements with the periodically repeating magnetic pattern of the associated magnetic scale is avoided.
    Type: Grant
    Filed: March 6, 2013
    Date of Patent: January 10, 2017
    Assignees: RENISHAW PLC, RLS MERILNA TEHNIKA D.O.O.
    Inventors: Peter Kogej, Alja{hacek over (z)} Ogrin, Gregor Dol{hacek over (s)}ak, Bla{hacek over (z)} Hajdinjak
  • Patent number: 9464919
    Abstract: With magnetic poles of a magnetic scale each having a length in the moving direction of T, a magnetic field sensing part has m element lines (m?2) each including n magnetic sensors (n?2) as the magnetic sensors corresponding to one of the magnetic poles. The n magnetic sensors included in one of the element lines are arranged at a constant pitch of ?(?=T/n). Each of the magnetic sensors included in the second or further element line is placed shifted by ?/m in the moving direction of the opposite magnetic pole from each of the magnetic sensors included in the previous element line.
    Type: Grant
    Filed: February 12, 2015
    Date of Patent: October 11, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventor: Takaki Sugino
  • Patent number: 9435663
    Abstract: An absolute position encoder scale includes first and second layers in a stacked configuration. A read head moves relative to spatial modulation patterns of first (top) and second (lower) signal layers along a measuring axis, and a sensing portion produces one or more scale sensing fields to sense the signal layers. A higher frequency scale sensing field may provide a first limited sensing depth to sense position relative to the top signal layer pattern, and a lower frequency field may provide a second deeper sensing depth to sense position relative to the lower signal layer pattern. In some embodiments, an isolation layer between the first and second layers may include a spatial modulation pattern that complements the first layer pattern, to nullify its signal effects when sensing position relative to the second layer pattern using the second sensing depth.
    Type: Grant
    Filed: August 22, 2014
    Date of Patent: September 6, 2016
    Assignee: Mitutoyo Corporation
    Inventor: Ted Staton Cook
  • Patent number: 9232909
    Abstract: The invention provides methods and systems for determining the position of a remote object such as an in vivo medical device such as capsule or probe within a medical patient. Integrated computer and computer executable remote permanent magnetic dipole position and orientation detection system monitors remote object movement. User interface displays remote permanent magnetic dipole location and orientation in a 3-dimensional view. Database stores object position movement in association with time. Magnetic sensor planes detect remote objects with permanent magnetic dipole and generate magnetic field information signal. Computer stores and searches location and posture information use a file.
    Type: Grant
    Filed: March 5, 2014
    Date of Patent: January 12, 2016
    Assignee: ANKON TECHNOLOGIES CO., LTD
    Inventors: Xiaodong Duan, Guohua Xiao, Xinhong Wang
  • Patent number: 9222807
    Abstract: A method is provided for producing a magnetic position or path sensor element, the magnetic position or path sensor element having at least one magnetic pathway that extends along a displacement path and that has a plurality of magnetic north-south transitions, as well as at least one magnetic sensor mounted so as to be movable relative to the magnetic pathway. At least one of the magnetic north-south transitions is defined as a critical north-south transition whose position is to be detected with a specified degree of precision. Adjacent to the critical north-south transition are situated magnetic poles having identical polarity. The method provides production reliability by reducing the sensitivity of the magnetic position or path sensor element to positional tolerances.
    Type: Grant
    Filed: June 10, 2010
    Date of Patent: December 29, 2015
    Assignee: ROBERT BOSCH GMBH
    Inventors: Patrick Calandrini, Thomas Kitzing, Goetz Eberle, Marcel Spoerl
  • Patent number: 9217448
    Abstract: An arithmetic processing portion is configured to perform a correction process for resetting an original position of the stroke position by using at least detection results of a voltage value of a first magnetic force sensor as well as a second magnetic force sensor according to the piston movement, and further not to perform the correction process to reset the original position of the stroke position by using the detection result of the first magnetic force sensor and the second magnetic force sensor right after an abutment when the piston is abutted to the stroke end based on a detection result of a stroke end abutment detecting system.
    Type: Grant
    Filed: September 26, 2012
    Date of Patent: December 22, 2015
    Assignee: Komatsu Ltd.
    Inventors: Masato Kageyama, Yuuki Yokoyama
  • Patent number: 9102245
    Abstract: An end cap for a seat track assembled between a vehicle seat and a floor of a vehicle. The seat track includes an upper track attached to the vehicle seat and a lower track attached to the floor that receives the upper track in a sliding relationship. A seat position sensor attached to the upper track senses the position of the lower seat track. The end cap has a plurality of longitudinally extending walls that are assembled over the lower track. One of the longitudinally extending walls is attached to a recessed portion of the lower track with an external surface that is contiguous with the outer surface of one wall of the lower track.
    Type: Grant
    Filed: January 15, 2014
    Date of Patent: August 11, 2015
    Assignee: Lear Corporation
    Inventors: Hans-Peter Mischer, Klaus Walter, Michael Wojatzki, Christian Ruthmann
  • Patent number: 9079511
    Abstract: A vehicle seat power track for an automobile vehicle seat which includes a sensor arrangement to detect the seat position along the track relative to a front airbag apparatus and generate a signal to control the apparatus of the airbag. The vehicle seat power track also includes brackets configured to reduce horizontal movement of the track components.
    Type: Grant
    Filed: August 21, 2013
    Date of Patent: July 14, 2015
    Assignees: Johnson Controls Tedhnology Company, Honda Motor Co., Ltd.
    Inventors: Paul J. Jefferies, Vasile E. Bozintan, Nishide Harutomi, Honda Hiyoyuki, Ishii Yukihisa, Uno Koji, Thomas O. Dobry, Richard T. Krause
  • Patent number: 9080895
    Abstract: A magnetic rotational position sensor assembly for measurement of a rotational angular position of a rotating structure. The sensor assembly includes a shaft member extending along a primary rotational axis for primary rotational movement in response to rotation of the rotating structure, a motion conversion member structured and configured to transform the primary rotational movement of the shaft member into secondary movement, a magnet member secured to the motion conversion member for displacement along a travel path in response to the converted secondary movement of the motion conversion member, and a non-contact magnetic sensor that senses a change in position of the magnet member by sensing a corresponding variation in the magnetic field during displacement of the magnet member along the travel path in response to rotation of the rotating structure, wherein the magnetic sensor generates an output signal representative of a relative rotational angular position of the rotating structure.
    Type: Grant
    Filed: May 25, 2012
    Date of Patent: July 14, 2015
    Assignee: Sensata Technologies, Inc.
    Inventors: Tom Martin, David McKeeman, Mark Vorndran, Gary Johnson
  • Patent number: 9038663
    Abstract: To provide an opening degree detection device for an automatically operated valve which is easily assembled into an automatically operated valve, makes it easy to ensure detection accuracy at the time of assembling the opening degree detection device, and is easily applicable to an existing automatically operated valve. The opening degree detection device includes: a base plate 4 which is detachably mounted on an automatically operated valve 2; a displacement sensor 5; and a target 6 having an inclined detection surface 6a which is detected by the displacement sensor 5. The target 6 is fixed to the base plate 4. The displacement sensor 5 is supported on a valve stem 14 by way of a sensor support member 21, and the sensor support member 21 is supported on the base plate 4 by way of a guide means.
    Type: Grant
    Filed: November 17, 2011
    Date of Patent: May 26, 2015
    Assignee: FUJIKIN INCORPORATED
    Inventors: Ryousuke Dohi, Atsuo Tomita, Kouji Nishino, Yohei Sawada, Nobukazu Ikeda
  • Patent number: 9042716
    Abstract: The linear position of an object is estimated using multiple magnetic field sensors and a magnet. The multiple magnetic field sensors are held in fixed relation to one another and in moving relation with respect to the magnet. Readings of the first and second magnetic field sensors and the fixed distance between the first and second magnetic field sensors may be used to estimate the linear position. In some embodiments, an estimated frequency of an approximately sinusoidal field versus position characteristic is also used as part of the estimation.
    Type: Grant
    Filed: August 15, 2013
    Date of Patent: May 26, 2015
    Assignee: Allegro Microsystems, LLC
    Inventors: Bryan Cadugan, Alexander Latham
  • Patent number: 9041386
    Abstract: A linear position measuring system (10) and a method for determining a position of a carriage in relation to a slide rail (12), with an incremental scale (14) placed along the slide rail (12) and a scanner secured to the slide scale. The scanner is designed to scan a plurality of incremental markings along the incremental scale (14), wherein the incremental markings can be scanned as an essentially analog signal progression. The scanner is designed to scan the incremental markings with a variable scanning frequency. The scanning frequency can be adaptively varied in relation to a currently acquired frequency of the analog signal progression, wherein the variable scanning frequency measures at least twice the currently acquired frequency of the analog signal progression.
    Type: Grant
    Filed: May 31, 2012
    Date of Patent: May 26, 2015
    Assignee: SCHNEEBERGER HOLDING AG
    Inventor: Klaus-Dieter Goetz
  • Patent number: 9035645
    Abstract: A first and a second magnet are provided on a movable member so as to oppose to each other across a virtual plane. Each magnet is magnetized in a direction perpendicular to the movable member, so that the same magnetic poles of the magnets are opposed to each other. A hall IC is provided at a position more remote from the movable member than the magnets so as to be movable on the virtual plane relative to the movable member. A Y-parallel area is formed in a space equally distanced from the first and the second magnets, in which magnetic fields of the first and the second magnet rebel against each other, so that directions of the magnetic fields are so made to be in parallel to a stroke direction of the movable member. Robustness for a position gap between the magnets and the hall IC is improved.
    Type: Grant
    Filed: October 30, 2012
    Date of Patent: May 19, 2015
    Assignee: DENSO CORPORATION
    Inventors: Akitoshi Mizutani, Naoaki Kouno
  • Publication number: 20150130447
    Abstract: An actuator and sensor assembly with a housing defining a pocket and an access opening. A substrate with a sensor is located in the pocket through the access opening. A nozzle extends from the housing. A sleeve surrounds the nozzle and retains a hose on the nozzle. A connector assembly is located opposite and normal the pocket and the substrate. Compliant terminal pins extend generally normally from the connector assembly into the pocket and through-holes in the substrate. An actuator shaft gimbal includes a head located in a housing collar and a flexible neck extends through a housing aperture. A shoulder on the neck of the gimbal locks the gimbal in the collar.
    Type: Application
    Filed: November 10, 2014
    Publication date: May 14, 2015
    Applicant: CTS CORPORATION
    Inventors: William D. Storrie, Steven Brown, Gerard McCafferty
  • Patent number: 9030194
    Abstract: A scanning device for a position encoder is provided that comprises a plurality of sensor elements for generating a plurality of sensor signals. A summation unit is also provided for generating at least a first summation signal and a second summation signal that provide information on the relative alignment of the scanning device and an associated scale. The first summation signal is generated from a first subset of the plurality of sensor signals and the second summation signal is generated from a second subset of the plurality of sensor signals. The plurality of sensor elements are substantially evenly spaced apart from one another N and sensor elements are provided per period of an associated scale, wherein N is an integer value and a multiple of three and four. In this manner, the third harmonic contribution to the summation signals is suppressed.
    Type: Grant
    Filed: March 1, 2010
    Date of Patent: May 12, 2015
    Assignees: RLS Merilna Tehnika D.O.O., Renishaw PLC
    Inventor: Gregor Dolsak
  • Patent number: 9024623
    Abstract: Techniques for coupling with devices that convert displacements into differential voltages and improvement of the sensitivity of such devices. A transducer operates based on changes of inductances between primary and secondary of a transformer to produce a differential signal that includes a noninverted signal and an inverted signal. A switch receives the noninverted signal and the inverted signal. A processor creates a square wave signal for driving the transducer input, and also digitally creates an inverted transducer output. A filter operates to filter the square wave output from the processor to produce a substantially single frequency signal at a specified timing having a specified phase relationship relative to the first phase inversion signal based on instructions that are executed by the processor.
    Type: Grant
    Filed: September 18, 2012
    Date of Patent: May 5, 2015
    Assignees: Oxford Instruments PLC, Oxford Instruments AFM, Inc
    Inventors: Dan Bocek, Roger Proksch
  • Patent number: 9013192
    Abstract: The invention relates to a measuring device for detecting absolution positions, comprising a sensor unit (N, M) as a planar coil structure and a scale having alternating areas of variable reluctance or conductivity along the measuring line. The invention is characterized in that the measuring device has at least two divisions (T1, T2) for determining the absolute position within the measuring length, the at least two divisions being coded aperiodically and in a bitwise manner and extending parallel to each other and, for each bit formation, having opposite effects on a coil element (S2, S3, S4) as part of the entire sensor structure. Preferably, each coil element (S2, S3, S4), comprising its own emitter and receiver windings (E, R), is balanced in offset, and the entire sensor structure provides approximately equal signal amplitudes for each individual bit of the absolute value at any position of the coded scale by means of compensation windings.
    Type: Grant
    Filed: November 15, 2010
    Date of Patent: April 21, 2015
    Assignee: AMO Automatisierung Messtechnik Optik GmbH
    Inventors: Victor Vasiloiu, Heinz Eisschiel
  • Publication number: 20150091554
    Abstract: A magnetic encoder has a high resolution track including a plurality of North/South pole pairs defining a plurality of pole junctions, and a reference track including a North/South pole pair defining a North/South pole junction aligned with a first pole junction of the high resolution track, and a South/North pole junction aligned with a second pole junction of the high resolution track. Only a single pole junction of the high resolution track is positioned between the first and second pole junctions of the high resolution track.
    Type: Application
    Filed: March 13, 2013
    Publication date: April 2, 2015
    Inventor: Mark LaCroix
  • Patent number: 8991173
    Abstract: A linear actuator for a variable-geometry member of a turbocharger includes a piston/rod assembly that can axially translate and also pivot to a limited extent. A permanent magnet is mounted in a fixed position within the actuator. A non-magnetized flux carrier is mounted in the piston/rod assembly, and its movement alters the magnetic field of the magnet. A Halls effects sensor detects the magnetic field and the signals produced by the sensor are used for determining axial position of the piston/rod assembly.
    Type: Grant
    Filed: March 6, 2012
    Date of Patent: March 31, 2015
    Assignee: Honeywell International Inc.
    Inventors: Robert Mavir, Matus Rakoci
  • Publication number: 20150077092
    Abstract: A magnetic encoder apparatus is presented that includes a plurality of magnetic sensor elements (e.g. Hall sensors) for reading an associated magnetic scale that produces a periodically repeating magnetic pattern. The plurality of magnetic sensor elements produce a plurality of sensor signals and an analyzer is provided for analyzing the plurality of sensor signals to provide a measure of the position of the magnetic sensor elements relative to the associated magnetic scale. The analyzer is arranged to use the plurality of sensor signals to assess the period of the periodically repeating magnetic pattern sensed by the plurality of magnetic sensor elements. In this manner, the requirement to carefully match the period of the sensor elements with the periodically repeating magnetic pattern of the associated magnetic scale is avoided.
    Type: Application
    Filed: March 6, 2013
    Publication date: March 19, 2015
    Inventors: Peter Kogej, Aljaz Ogrin, Gregor Dolsak, Blaz Hajdinak
  • Patent number: 8978698
    Abstract: A blowout preventer for sealing a tubular of a wellbore is provided. The blowout preventer has a housing having a bore therethrough for receiving the tubular, at least one ram slidably positionable in the housing (each of the rams having a ram block for sealing engagement about the tubular), an actuator for selectively driving the ram block (the actuator comprising a piston slidably positionable in a cylinder), and a monitor for detecting the piston therein. The monitor has a visual indicator on an exterior of the cylinder. The visual indicator is operatively coupled to the piston for displaying a position of the piston as the piston travels within the cylinder whereby a position of the ram may be determined.
    Type: Grant
    Filed: June 24, 2011
    Date of Patent: March 17, 2015
    Assignee: National Oilwell Varco, L.P.
    Inventors: Joseph James Liotta, Eric Trevor Ensley, Christopher Dale Johnson
  • Patent number: 8970210
    Abstract: The disclosure relates to a magnetic position sensor in at least two directions, the sensor including at least one magnetized element and a probe including at least two magneto-sensitive elements located substantially on the same point and each measuring one of the components of the magnetic field generated by the magnetized element, the magnetized element being movable relative to the magneto-sensitive elements. The probe includes at least one processing circuit capable of carrying out angle and module calculations on the basis of algebraic combinations of the components of the magnetic field and providing at least two independent signals representing the position of the movable element along, respectively, one and the other of the two directions.
    Type: Grant
    Filed: October 28, 2010
    Date of Patent: March 3, 2015
    Assignee: Moving Magnet Technologies (MMT)
    Inventors: Gérald Masson, Thierry Dorge
  • Patent number: 8970207
    Abstract: A measuring device 1 configured to receive a drill bit 3, and determine the relative displacement of the drill bit 3, is disclosed. The measuring device 1 is configured to be deployed proximate to the material to be drilled, reset, and subsequently determine the relative displacement of the drill bit 3. The measuring device 1 can be used in orthopaedic surgery procedures for determining the depth of a bore hole in bone.
    Type: Grant
    Filed: May 16, 2012
    Date of Patent: March 3, 2015
    Assignee: DePuy Synthes Products, LLC
    Inventor: Adrian Baumgartner
  • Patent number: 8963542
    Abstract: A multi-pole variable reluctance resolver is balanced wired and driven by 180 degree differential signals. Capacitive passive elements may be serially added to the resolver to minimize magnetic interference and cancel flux between poles of the same polarity and orthogonal poles, as well as minimize the effect of input driving signal distortion. Symmetric networks of resistive and capacitive elements may also be added to the resolver to overcome noise sensitivity associated with balanced wired resolvers.
    Type: Grant
    Filed: April 9, 2012
    Date of Patent: February 24, 2015
    Inventor: Chun Soo Park
  • Patent number: 8960225
    Abstract: A method for detecting a closing moment of a valve having a coil drive includes impressing an electrical voltage in the exciter coil to generate an exciter current through the coil, which attracts the movable armature and lifts the valve element off its valve seat. After the exciter current decays to zero, the voltage profile at the exciter coil is sampled and read out over time in the form of time value/voltage value pairs. The detected voltage values and time valves are transformed by the formation of a logarithm to form a transformed function. The transformed function is subsequently derived numerically with the formation of a derivation function. A transformed time value corresponding to the valve closing moment is detected based on the derivation function of a predetermined threshold value S being undershot, and the closing moment is calculated therefrom by inverse transformation.
    Type: Grant
    Filed: May 9, 2012
    Date of Patent: February 24, 2015
    Assignee: Continental Automotive GmbH
    Inventor: Johann Görzen
  • Patent number: 8963541
    Abstract: The invention relates to a contactless magnetic sensor for detecting a linear or angular position, comprising a moveable ferromagnetic element (1) the position of which is detected, and a stator assembly (2) itself, comprising two ferromagnetic parts (3, 4), defining with the moveable ferromagnetic element (1) two respective air gaps (7, 8), a permanent magnet (5) and a magneto-sensitive element (6) subjected to a magnetic field that depends on the position of the moveable ferromagnetic element (1) and designed to deliver a measurement signal that depends on the magnetic field to which it is subjected. According to the invention, the two ferromagnetic parts (3, 4) define therebetween a third air gap (9), the permanent magnet (5) being rigidly connected only to the first ferromagnetic part (3) and the magneto-sensitive element (6) being placed in the third air gap (9).
    Type: Grant
    Filed: April 7, 2011
    Date of Patent: February 24, 2015
    Assignee: Moving Magnet Technologies (MMT)
    Inventors: Didier Frachon, Stephane Biwersi
  • Patent number: 8957670
    Abstract: A stroke amount detection device includes a yoke, a magnetic flux generation section, and a magnetism detection section. The yoke has a protruding section that protrudes to outside the yoke. The magnetic flux generation section is located in the yoke. The magnetism detection section is disposed between the magnetic flux generation section and the protruding section. The magnetism detection section is disposed at a fixed position with respect to the magnetic flux generation section. The magnetism detection section outputs a signal in accordance with a magnetic flux density generated due to a relative movement of the yoke with respect to the magnetism detection section.
    Type: Grant
    Filed: April 4, 2013
    Date of Patent: February 17, 2015
    Assignee: Denso Corporation
    Inventors: Akitoshi Mizutani, Hitomi Honda, Yoshiyuki Kono
  • Patent number: 8952684
    Abstract: There is provided a magnetic force sensor including: an action unit elastically supported by a supporting member; a magnetic-flux generating source including two or more magnets which are disposed so that a polarity of each of the magnetic-pole faces of the magnets is opposite to a polarity of a corresponding one of the magnetic-pole faces of the adjacent magnets in a particular direction; first magnetoelectric transducers that are individually provided at positions, the positions being positions at which the first magnetoelectric transducers oppose the magnetic-pole faces of the magnets in the action unit; and a second magnetoelectric transducer provided between the first magnetoelectric transducers. Vertical-direction components of a force are detected on the basis of outputs of the first magnetoelectric transducers, and a horizontal-direction component of the force is detected on the basis of an output of the second magnetoelectric transducer.
    Type: Grant
    Filed: December 8, 2010
    Date of Patent: February 10, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventor: Shuuichi Sato
  • Patent number: 8947076
    Abstract: Disclosed are systems and methods for effectively sensing rotational position of an object. In certain embodiments, a rotational position sensor can include a shaft configured to couple with the rotating object. The shaft can be configured to couple with a magnet carrier such that rotation of the shaft yields translational motion of the carrier. A magnet mounted to the carrier also moves longitudinally with respect to the axis of the shaft, and relative to a magnetic field sensor configured to detect the magnet's longitudinal position. The detected longitudinal position can be in a range corresponding to a rotational range of the shaft, where the rotational range can be greater than one turn. In certain embodiments, the rotational position sensor can include a programmable capability to facilitate ease and flexibility in calibration and use in a wide range of applications.
    Type: Grant
    Filed: January 18, 2010
    Date of Patent: February 3, 2015
    Assignee: Bourns, Inc.
    Inventors: Eugen Bogos, Perry Wehlman, Thanh Vinh Nguyen
  • Patent number: 8937473
    Abstract: Sensor for continuously measuring the angular position of a shaft rotatably mounted relative to a housing. The sensor includes a stator, a rotor attachable to the shaft, and permanent magnets having alternating polarities located on a stator or a rotor capable of creating magnetic induction during the rotation of the rotor. A magnetic circuit channels the magnetic induction such that it is proportional to a sinusoidal function of the angle of the rotor. At least two electric transducers having linear output, each angularly offset one from the other relative to the stator, are located in the gaps arranged in the circuit. The magnetic circuit is toothed and includes at least one measuring unit having three teeth per pair of magnets, each tooth including a gap with a transducer.
    Type: Grant
    Filed: November 5, 2010
    Date of Patent: January 20, 2015
    Assignee: Sagem Defense Securite
    Inventor: Jérôme Piaton
  • Publication number: 20150015175
    Abstract: The position detecting apparatus includes a comparing part that compares the value of the digital signal output from the AD converter and a reference value that is based on a preset reference amplitude at the timings and outputs a control signal responsive to a result of the comparison. The position detecting apparatus includes an amplitude controlling part that controls amplification factors of the first amplifier and the second amplifier in such a manner that the value of the digital signal output from the AD converter comes closer to the reference value in response to the control signal output from the comparing part.
    Type: Application
    Filed: February 27, 2014
    Publication date: January 15, 2015
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Hiroshi Ariga, Masahiro Inoue
  • Patent number: 8933691
    Abstract: A rotary position sensor for determining the rotary position of a rotary component may include a sensor and a magnet. The sensor may be responsive to a characteristic of a magnetic field that changes as the magnetic field moves. The magnet may be carried by the rotary component for rotation with the rotary component and have an anti-rotation feature to prevent rotation of the magnet relative to the rotary component to maintain a desired rotary position of the magnet.
    Type: Grant
    Filed: April 30, 2010
    Date of Patent: January 13, 2015
    Assignee: Walbro Engine Management, L.L.C.
    Inventors: William E. Galka, Bradley J. Roche, David L. Speirs, Eric G. Zbytowski
  • Patent number: 8922200
    Abstract: The invention relates to a method for determining the actual angle position of a rotatable magnetic component in an electric drive (10) having an odd number of pole pairs. An actual angle measurement value (?AMR,k) of the rotatable component is measured using an angle sensor (28) which only measures the actual angle measurement value (?AMR,k) within a predefined reduced angular area, and an associated device (20) for determining an actual angle position of a rotatable magnetic component in an electric drive (10).
    Type: Grant
    Filed: March 17, 2011
    Date of Patent: December 30, 2014
    Assignee: Robert Bosch GmbH
    Inventor: Ulrich Vollmer
  • Patent number: 8922199
    Abstract: A method and system for magnetic measurement of elongation of a fastener includes a means for providing a magnetic field gradient along an axis of the fastener, such as one or more permanent magnets. A magnetic sensor is mounted in the fastener in the magnetic field gradient. Magnetic field measurements taken by the magnetic sensor are dependent on a length of the fastener and are sufficiently sensitive to monitor loading during a service life of the fastener. The fastener may be equipped with a signal reader and a data interface for offloading measurement values.
    Type: Grant
    Filed: July 26, 2012
    Date of Patent: December 30, 2014
    Assignee: Austin R&D, Inc.
    Inventors: Reed Lackland McConnell, Jamie Parker Lamb, Jr., Gregory John Young