Patents by Inventor Akihiro Unno

Akihiro Unno has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11022659
    Abstract: An object of the present invention is to provide a magnetic sensor that can reduce influences of a disturbance magnetic field while ensuring high detection sensitivity. The magnetic sensor includes a sensor chip 20 having an element formation surface 20S on which magnetic detection elements MR3, MR4 are formed, a first magnetic member 31 placed on the element formation surface 20S and having a first height H1 as a height from the element formation surface 20S, and a second magnetic member 32 located on an opposite side of the magnetic detection elements MR3, MR4 to the first magnetic member 31 and having a second height H2 lower than the first height H1. According to the present invention, because the height H2 of the second magnetic member 32 is lower than that of the first magnetic member 31, a detection magnetic field attracted to the second magnetic member 32 can be reduced while a disturbance magnetic field is shielded by the second magnetic member 32.
    Type: Grant
    Filed: October 20, 2016
    Date of Patent: June 1, 2021
    Assignee: TDK CORPORATION
    Inventors: Yuki Asazuma, Kei Tanabe, Akihiro Unno, Atsushi Matsuda, Masashi Takahashi
  • Patent number: 10991505
    Abstract: A coil unit connection structure is provided which can integrate locations connected to a power cable into one side in an arrangement direction of a plurality of coil units. In a coil unit connection structure that electrically connects a plurality of coil units, each of the coil units includes a coil and a return wire. A plurality of the coils of the plurality of coil units is electrically connected to each other. A plurality of the return wires of the plurality of coil units is electrically connected to each other. A terminal unit is provided which includes a connecting wire that electrically connects the coil and the return wire of the coil unit at the terminal end.
    Type: Grant
    Filed: April 19, 2018
    Date of Patent: April 27, 2021
    Assignee: THK CO., LTD.
    Inventors: Akihiro Unno, Hirofumi Suzuki
  • Patent number: 10844904
    Abstract: To suitably set a control gain in feedback control while suppressing an increase in apparatus size. A workpiece transport control system includes: one or a plurality of motion guidance devices; a table on which a workpiece is to be placed; an actuator which imparts a driving force to the table; a control unit which performs transport control by feedback control; and a calculation unit which calculates a transport load applied from the workpiece to a moving member of each of the one or a plurality of motion guidance devices, wherein a control gain related to the feedback control in the transport control is adjusted on the basis of the transport load in each of the one or a plurality of motion guidance devices.
    Type: Grant
    Filed: January 16, 2018
    Date of Patent: November 24, 2020
    Assignee: THK CO., LTD.
    Inventors: Akihiro Unno, Yuki Hayashi, Yuki Tanaka, Tomofumi Ohashi, Yusuke Asano, Katsunori Kogure
  • Publication number: 20200355758
    Abstract: A magnetic sensor suppressing bias magnetic field effects includes a magnetic detecting unit including first to fourth magneto-resistive elements to which a first magnetic field to be detected is applied, a differential amplifier into which the output voltage of the magnetic detecting unit is input, a first magnetic field generating conductor which, by a first feedback current output by the differential amplifier, applies to the magnetic detecting unit a second magnetic field to cancel the first magnetic field detected by the magnetic detecting unit, a bias magnetic field detector which detects a bias magnetic field applied to the magnetic detecting unit and outputs a second feedback current corresponding to the bias magnetic field, and a second magnetic field generating conductor which, by the second negative feedback current, applies to the magnetic detecting unit a correcting magnetic field to cancel the bias magnetic field detected by the magnetic detecting unit.
    Type: Application
    Filed: April 6, 2018
    Publication date: November 12, 2020
    Inventors: Kei TANABE, Akihiro UNNO
  • Publication number: 20200256932
    Abstract: An object of the present invention is to provide a magnetic sensor that can reduce influences of a disturbance magnetic field while ensuring high detection sensitivity. The magnetic sensor includes a sensor chip 20 having an element formation surface 20S on which magnetic detection elements MR3, MR4 are formed, a first magnetic member 31 placed on the element formation surface 20S and having a first height H1 as a height from the element formation surface 20S, and a second magnetic member 32 located on an opposite side of the magnetic detection elements MR3, MR4 to the first magnetic member 31 and having a second height H2 lower than the first height H1. According to the present invention, because the height H2 of the second magnetic member 32 is lower than that of the first magnetic member 31, a detection magnetic field attracted to the second magnetic member 32 can be reduced while a disturbance magnetic field is shielded by the second magnetic member 32.
    Type: Application
    Filed: October 20, 2016
    Publication date: August 13, 2020
    Applicant: TDK Corporation
    Inventors: Yuki ASAZUMA, Kei TANABE, Akihiro UNNO, Atsushi MATSUDA, Masashi TAKAHASHI
  • Patent number: 10738827
    Abstract: In a management system which manages user equipment installed in a prescribed space managed by a user, the user equipment including a plurality of motion guidance devices each including a track member, a moving member, and a plurality of displacement sensors which detect displacements of the moving member in a prescribed number of displacement directions in the moving member, on the basis of lifespan-related information corresponding to each of the plurality of motion guidance devices, a lifespan exhaustion ratio of each motion guidance device is calculated and, on the basis of the calculated lifespan exhaustion ratio, replacement object devices to be replaced within a prescribed period which constitute a part of or all of the plurality of motion guidance devices are determined. In addition, a user is notified of a replacement timing at which all of the determined replacement object devices in the user equipment are to be replaced.
    Type: Grant
    Filed: December 21, 2017
    Date of Patent: August 11, 2020
    Assignee: THK CO., LTD.
    Inventors: Akihiro Unno, Yuki Hayashi, Yuki Tanaka, Tomofumi Ohashi, Yusuke Asano, Katsunori Kogure
  • Publication number: 20200124091
    Abstract: In a management system which manages user equipment installed in a prescribed space managed by a user, the user equipment including a plurality of motion guidance devices each including a track member, a moving member, and a plurality of displacement sensors which detect displacements of the moving member in a prescribed number of displacement directions in the moving member, on the basis of lifespan-related information corresponding to each of the plurality of motion guidance devices, a lifespan exhaustion ratio of each motion guidance device is calculated and, on the basis of the calculated lifespan exhaustion ratio, replacement object devices to be replaced within a prescribed period which constitute a part of or all of the plurality of motion guidance devices are determined. In addition, a user is notified of a replacement timing at which all of the determined replacement object devices in the user equipment are to be replaced.
    Type: Application
    Filed: December 21, 2017
    Publication date: April 23, 2020
    Applicant: THK CO., LTD.
    Inventors: Akihiro Unno, Yuki Hayashi, Yuki Tanaka, Tomofumi Ohashi, Yusuke Asano, Katsunori Kogure
  • Publication number: 20200103311
    Abstract: A lifespan diagnosis device for a motion guidance device including: a stress calculating means which calculates stresses during movement for each of virtual segments, the stresses during movement being stresses that occur in each segment during a movement of the moving member; a counting means which counts, for each of the segments, on the basis of the amount of displacement, the number of occurrences of the stresses during movement which repetitively occur with waving during a movement of the moving member along the track; and a diagnostic means which calculates, for each of the segments, a lifespan exhaustion ratio on the basis of magnitudes of the stresses during movement and the number of occurrences of the stresses during movement, and which diagnoses the lifespan of the motion guidance device on the basis of the calculated lifespan exhaustion ratios of the respective segments.
    Type: Application
    Filed: December 21, 2017
    Publication date: April 2, 2020
    Applicant: THK CO., LTD.
    Inventors: Akihiro Unno, Yuki Hayashi, Yuki Tanaka, Tomofumi Ohashi, Yusuke Asano, Katsunori Kogure
  • Publication number: 20200098510
    Abstract: A coil unit connection structure is provided which can integrate locations connected to a power cable into one side in an arrangement direction of a plurality of coil units. In a coil unit connection structure that electrically connects a plurality of coil units, each of the coil units includes a coil and a return wire. A plurality of the coils of the plurality of coil units is electrically connected to each other. A plurality of the return wires of the plurality of coil units is electrically connected to each other. A terminal unit is provided which includes a connecting wire that electrically connects the coil and the return wire of the coil unit at the terminal end.
    Type: Application
    Filed: April 19, 2018
    Publication date: March 26, 2020
    Inventors: Akihiro UNNO, Hirofumi SUZUKI
  • Publication number: 20190383327
    Abstract: A machining control system for machining of a workpiece movably supported by a motion guidance device having a track member which extends along a longitudinal direction and a moving member which is arranged so as to oppose the track member via a rolling element being rollably arranged inside a rolling groove and which is relatively movable along the longitudinal direction of the track member, the machining control system including: an acquisition unit which acquires prescribed machining information related to a load applied to the motion guidance device when machining of the workpiece is performed by the machining device; and an output unit which generates machining correction information for correcting a prescribed control parameter for machining of the workpiece by the machining device on the basis of the prescribed machining information acquired by the acquisition unit and which outputs the generated machining correction information to a side of the machining device.
    Type: Application
    Filed: January 15, 2018
    Publication date: December 19, 2019
    Applicant: THK CO., LTD.
    Inventors: Akihiro Unno, Yuki Hayashi, Yuki Tanaka, Tomofumi Ohashi, Yusuke Asano, Katsunori Kogure
  • Publication number: 20190376553
    Abstract: To suitably set a control gain in feedback control while suppressing an increase in apparatus size. A workpiece transport control system includes: one or a plurality of motion guidance devices; a table on which a workpiece is to be placed; an actuator which imparts a driving force to the table; a control unit which performs transport control by feedback control; and a calculation unit which calculates a transport load applied from the workpiece to a moving member of each of the one or a plurality of motion guidance devices, wherein a control gain related to the feedback control in the transport control is adjusted on the basis of the transport load in each of the one or a plurality of motion guidance devices.
    Type: Application
    Filed: January 16, 2018
    Publication date: December 12, 2019
    Applicant: THK CO., LTD.
    Inventors: Akihiro Unno, Yuki Hayashi, Yuki Tanaka, Tomofumi Ohashi, Yusuke Asano, Katsunori Kogure
  • Patent number: 9231182
    Abstract: In a piezoelectric element, a piezoelectric film, a first electrode film provided on one surface of the piezoelectric film, and a second electrode film provided on the other surface of the piezoelectric film form a layered structure, an outer contour of the first electrode film and an outer contour of the second electrode film are positioned outside an outer contour of the piezoelectric film as viewed in a layering direction, an organic resin film is in contact with the piezoelectric film, and generation of noise is suppressed.
    Type: Grant
    Filed: May 21, 2015
    Date of Patent: January 5, 2016
    Assignee: TDK CORPORATION
    Inventors: Hirofumi Natori, Kenichi Tochi, Akihiro Unno, Takashi Aoyagi
  • Publication number: 20150340588
    Abstract: In a piezoelectric element, a piezoelectric film, a first electrode film provided on one surface of the piezoelectric film, and a second electrode film provided on the other surface of the piezoelectric film form a layered structure, an outer contour of the first electrode film and an outer contour of the second electrode film are positioned outside an outer contour of the piezoelectric film as viewed in a layering direction, an organic resin film is in contact with the piezoelectric film, and generation of noise is suppressed.
    Type: Application
    Filed: May 21, 2015
    Publication date: November 26, 2015
    Inventors: Hirofumi NATORI, Kenichi TOCHI, Akihiro UNNO, Takashi AOYAGI
  • Patent number: 9127643
    Abstract: A rotary moto actuator with a base 22, a table 21, a stator 25 and a rotor 26 of a rotary motor 31 and a first member 12 and a second member 14 of a guide mechanism 24 that have a plurality of base segments 22a, a plurality of table segments 21a, a plurality of stator segments 25a, a plurality of rotor segments 26a, a plurality of first member segments 12a and a plurality of second member segments 14, respectively, which all arranged circumferentially around a center line C. The stator segments 25a are connected to the base segments 22a, to which the first member segments 12a are connected. The rotor segments 26a are connected to the table segments 21a, to which the second member segments 14a are connected.
    Type: Grant
    Filed: September 14, 2010
    Date of Patent: September 8, 2015
    Assignee: THK CO., LTD.
    Inventors: Toshiyuki Aso, Tomoyuki Aida, Akihiro Unno, Yuki Hayashi, Ayako Miyajima, Kazuhiro Tani
  • Patent number: 9088201
    Abstract: A drive guide device capable of effectively releasing heat produced by a mover. The drive guide device has a movement unit 100 moved by a linear motor while being guided by a rail 230. The movement unit 100 has the mover 140 to which electricity is conducted to produce a magnetic field, a table 110 placed on the mover 140 on the opposite side of a base 210 to which the rail 230 is fixed, a heat sink 130 having heat radiation fins for releasing heat produced by the mover 140 and placed between the mover 140 and the table 110, and a heat transmission route for transmitting heat, which cannot be released by the heat sink 130, to the table 110. The table 110 is made from a material having a low thermal expansion coefficient.
    Type: Grant
    Filed: March 26, 2008
    Date of Patent: July 21, 2015
    Assignee: THK CO., LTD.
    Inventors: Toshiyuki Aso, Akihiro Unno
  • Patent number: 8872449
    Abstract: A distributed-arrangement linear motor in which stators are arranged in a distributed manner and a method of controlling the distributed-arrangement linear motor are provided. The linear motor 1 is a linear motor in which a stator and a movable member are relatively movable, wherein the stator and the movable member respectively have periodic structures in which plural kinds of poles of the stator and the movable member (12a, 12b, 12c) (22a, 22b, 22c) which magnetically act each other and arranged periodically subsequently in an order according to the arrangement in a direction of the relative motion therebetween; a plurality of stators are arranged in a distributed manner in the direction of the relative motion; a distance D1, D2 between adjacent stators is not more than a length Lmv of the movable member; the pole of the stator is formed of a coil 11; and a current control unit that controls current to be supplied to the coil based on the distance between the stators is provided.
    Type: Grant
    Filed: August 5, 2010
    Date of Patent: October 28, 2014
    Assignee: THK Co., Ltd.
    Inventors: Toshiro Tojo, Toshiyuki Aso, Yuki Nomura, Akihiro Unno
  • Publication number: 20120261920
    Abstract: Provided is a rotary motor actuator capable of simplifying the manufacture and assembly process. A base 22, a table 21, a stator 25 and a rotor 26 of a rotary motor 31 and a first member 12 and a second member 14 of a guide mechanism 24 have a plurality of base segments 22a, a plurality of table segments 21a, a plurality of stator segments 25a, a plurality of rotor segments 26a, a plurality of first member segments 12a and a plurality of second member segments 14, respectively, which all arranged circumferentially around a center line C. The stator segments 25a are connected to the base segments 22a, to which the first member segments 12a are connected. The rotor segments 26a are connected to the table segments 21a, to which the second member segments 14a are connected.
    Type: Application
    Filed: September 14, 2010
    Publication date: October 18, 2012
    Applicant: THK Co., Ltd.
    Inventors: Toshiyuki Aso, Tomoyuki Aida, Akihiro Unno, Yuki Hayashi, Ayako Miyajima, Kazuhiro Tani
  • Patent number: 8217538
    Abstract: A linear motor is provided with a stator, a slider disposed to be movable relatively with respect to the stator with a gap, and a non-magnetic plate mounted to either one of the stator and the slider so as to define the gap between the stator and the slider.
    Type: Grant
    Filed: December 28, 2009
    Date of Patent: July 10, 2012
    Assignee: THK Co., Ltd.
    Inventors: Kazuo Shoda, Toshiro Tojo, Yuki Nomura, Akihiro Unno
  • Publication number: 20120139455
    Abstract: A distributed-arrangement linear motor in which stators are arranged in a distributed manner and a method of controlling the distributed-arrangement linear motor are provided. The linear motor 1 is a linear motor in which a stator and a movable member are relatively movable, wherein the stator and the movable member respectively have periodic structures in which plural kinds of poles of the stator and the movable member (12a, 12b, 12c) (22a, 22b, 22c) which magnetically act each other and arranged periodically subsequently in an order according to the arrangement in a direction of the relative motion therebetween; a plurality of stators are arranged in a distributed manner in the direction of the relative motion; a distance D1, D2 between adjacent stators is not more than a length Lmv of the movable member; the pole of the stator is formed of a coil 11; and a current control unit that controls current to be supplied to the coil based on the distance between the stators is provided.
    Type: Application
    Filed: August 5, 2010
    Publication date: June 7, 2012
    Applicant: THK CO., LTD.
    Inventors: Toshiro Tojo, Toshiyuki Aso, Yuki Nomura, Akihiro Unno
  • Patent number: 8106545
    Abstract: Provided is a linear actuator unit that includes: a guide shaft formed of a magnetic body that is formed into a tubular shape while having a hollow portion therein, and has one linear opening portion formed thereon along an axial direction thereof; a slide member capable of reciprocating motion freely along the guide shaft; a magnet rod supported at both ends thereof in the hollow portion of the guide shaft; a forcer arranged on a periphery of the magnet rod in the hollow portion of the guide shaft, constitutes a linear motor together with the magnet rod, and is joined to the slide member while interposing the opening portion of the guide shaft therebetween; and a rod correction plate that is formed of a magnetic body, and juts out from the slide member forward and backward in a movement direction thereof so as to close the opening portion of the guide shaft.
    Type: Grant
    Filed: June 16, 2008
    Date of Patent: January 31, 2012
    Assignee: THK Co., Ltd.
    Inventors: Kazuto Homma, Akihiro Unno