Patents by Inventor Keiji Nakagawa

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

  • Publication number: 20200189237
    Abstract: The present invention relates to a laminated glass including a first glass plate, a second glass plate and an intermediate layer provided between the first glass plate and the second glass plate, in which the first glass plate has a first face and a second face opposing the first face, the second glass plate has a third face and a fourth face opposing the third face, the intermediate layer is provided between the second face and the third face, the second glass plate is a chemically-strengthened glass, and in the second glass plate, when a compressive stress on the third face is denoted as CS(3), a tensile stress generated in an interior of the second glass plate is denoted as CT, a thickness of the second glass plate is denoted as t, a depth of the compressive stress on a side of the third face is denoted as DOL(3) and a depth of a compressive stress on a side of the fourth face is denoted as DOL(4), CS(3)/[CT2×{t?(DOL(3)+DOL(4))}] is greater than 1.1 MPa?1×mm.
    Type: Application
    Filed: February 20, 2020
    Publication date: June 18, 2020
    Applicant: AGC Inc.
    Inventors: Keiji NOTSU, Jiro NISHIHAMA, Shunsuke SADAKANE, Makoto NARITA, Koji NAKAGAWA, Yusuke SAKAI, Maya HATANO
  • Publication number: 20200180316
    Abstract: A liquid ejecting apparatus includes a liquid ejecting head which ejects liquid from a nozzle that is disposed on a nozzle surface, a first wiping portion which is able to wipe away the liquid that is adhered to the nozzle surface, and a second wiping portion which is able to hold the liquid that is adhered to the nozzle surface by contacting the nozzle surface, wherein it is possible to perform a first maintenance operation in which the nozzle surface is wiped using the first wiping portion and a second maintenance operation in which the second wiping portion is caused to contact the nozzle surface due to the second wiping portion being biased by the first wiping portion.
    Type: Application
    Filed: February 19, 2020
    Publication date: June 11, 2020
    Inventors: Shigenori NAKAGAWA, Keiji MATSUMOTO
  • Publication number: 20200149889
    Abstract: A gyro vibrating element includes a drive signal pattern including a drive signal electrode to which a drive signal is applied and a drive signal wire connected to the drive signal electrode, a first detection signal pattern including a first detection electrode that outputs a first detection signal and a first detection signal wire connected to the first detection electrode, the first detection signal pattern being capacitively coupled to the drive signal pattern, and a second detection signal pattern including a second detection electrode that outputs a second detection signal opposite in phase to the first detection signal and a second detection signal wire connected to the second detection electrode, the second detection signal pattern being capacitively coupled to the drive signal pattern. Any one of the first detection signal pattern, the second detection signal pattern, and the drive signal pattern includes an adjustment pattern for adjusting an area of the signal pattern.
    Type: Application
    Filed: January 16, 2020
    Publication date: May 14, 2020
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Ryuta NISHIZAWA, Keiichi YAMAGUCHI, Keiji NAKAGAWA
  • Publication number: 20190270309
    Abstract: A liquid ejecting apparatus includes a liquid ejecting head which ejects liquid from a nozzle that is disposed on a nozzle surface, a first wiping portion which is able to wipe away the liquid that is adhered to the nozzle surface, and a second wiping portion which is able to hold the liquid that is adhered to the nozzle surface by contacting the nozzle surface, wherein it is possible to perform a first maintenance operation in which the nozzle surface is wiped using the first wiping portion and a second maintenance operation in which the second wiping portion is caused to contact the nozzle surface due to the second wiping portion being biased by the first wiping portion.
    Type: Application
    Filed: May 22, 2019
    Publication date: September 5, 2019
    Inventors: Shigenori NAKAGAWA, Keiji MATSUMOTO
  • Patent number: 10357973
    Abstract: A liquid ejecting apparatus includes a liquid ejecting head which ejects liquid from a nozzle that is disposed on a nozzle surface, a first wiping portion which is able to wipe away the liquid that is adhered to the nozzle surface, and a second wiping portion which is able to hold the liquid that is adhered to the nozzle surface by contacting the nozzle surface, wherein it is possible to perform a first maintenance operation in which the nozzle surface is wiped using the first wiping portion and a second maintenance operation in which the second wiping portion is caused to contact the nozzle surface due to the second wiping portion being biased by the first wiping portion.
    Type: Grant
    Filed: January 2, 2018
    Date of Patent: July 23, 2019
    Assignee: Seiko Epson Corporation
    Inventors: Shigenori Nakagawa, Keiji Matsumoto
  • Patent number: 10324461
    Abstract: A remote control apparatus capable of communicating with a control apparatus of an autonomously running work vehicle via a communication apparatus, the remote control apparatus comprising a communication apparatus, a control apparatus, a display apparatus, and cameras for obtaining images of the front and rear, wherein the display apparatus is provided with at least a remote control region for controlling the autonomously running work vehicle, a peripheral image region for displaying images captured by the cameras, and a work status display region, wherein the peripheral image region is provided with a frontal view and a rear view.
    Type: Grant
    Filed: July 2, 2015
    Date of Patent: June 18, 2019
    Assignee: YANMAR CO., LTD.
    Inventors: Kouhei Ogura, Wataru Nakagawa, Keiji Matsumoto, Akifumi Kuroda
  • Patent number: 10222212
    Abstract: A vibrator element includes a drive arm. The drive arm includes an upper surface, a lower surface, a groove opened to the upper surface, and a groove opened to the lower surface. The upper surface is disposed to be deviated by L1 on a +X axis side from the lower surface. The groove is disposed to be deviated by L2 on the +X axis side from the groove. L1 and L2 satisfy a relation of L2/L1>0.
    Type: Grant
    Filed: March 29, 2016
    Date of Patent: March 5, 2019
    Assignee: Seiko Epson Corporation
    Inventor: Keiji Nakagawa
  • Patent number: 10088314
    Abstract: A gyro element includes a base section, vibrating arms connected to the base section, driving piezoelectric elements disposed on the vibrating arms and causing a flexural vibration in the drive vibration mode of X-axis in-phase and Z-axis inverse-phase, and detecting piezoelectric elements disposed on the vibrating arms and adapted to detect the angular velocity around the detection axis, and in a case of making the vibrating arms flexurally vibrate in the drive vibration mode, signals having respective phases reverse to each other are generated in the detecting piezoelectric elements, and in a case in which the angular velocity is applied while making the vibrating arms flexurally vibrate in the drive vibration mode, signals having respective phases the same as each other are generated in the detecting piezoelectric elements.
    Type: Grant
    Filed: March 16, 2016
    Date of Patent: October 2, 2018
    Assignee: Seiko Epson Corporation
    Inventor: Keiji Nakagawa
  • Publication number: 20180274922
    Abstract: A vibration device includes a vibration element that has a plurality of terminals, a base that has a plurality of electrical connection terminals, and a board that has a wiring portion which electrically connects the plurality of electrical connection terminal and the plurality of terminals to each other, and that supports the vibration element with respect to the base. The board has a base fixing portion fixed to the base, a vibration element mounting portion on which the vibration element is mounted, and at least one beam portion which couples the base fixing portion and the vibration element mounting portion to each other. At least the one beam portion has a first portion which extends in a first direction and a second portion which extends in a second direction intersecting the first direction.
    Type: Application
    Filed: March 22, 2018
    Publication date: September 27, 2018
    Inventors: Ryuta NISHIZAWA, Shiro MURAKAMI, Keiichi YAMAGUCHI, Keiji NAKAGAWA
  • Patent number: 10079590
    Abstract: A vibrator element includes drive vibrating arms extending from an end of a base section, the drive vibrating arms are each provided with an obverse surface, a reverse surface disposed on an opposite side to the obverse surface, and a side surface connecting the obverse surface and the reverse surface to each other, a tilted section facing toward the obverse surface is disposed at least a part of the side surface, and there are disposed a first drive electrode and a second drive electrode obtained by bisection with an electrode separation section disposed in the tilted section.
    Type: Grant
    Filed: October 16, 2015
    Date of Patent: September 18, 2018
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Keiji Nakagawa, Ryuta Nishizawa, Atsushi Matsuo
  • Patent number: 10001373
    Abstract: A gyro element as a resonator element includes a drive resonating arm as a drive portion that is driven by application of a voltage, and a detection resonating arm as a detection portion in which charge is generated in response to a Coriolis force generated in the drive resonating arm. An amount of charge detected in the detection resonating arm in a state where the Coriolis force is not generated is greater than 0% and equal to or less than 0.1% of an amount of charge generated in the drive resonating arm when driving the drive resonating arm.
    Type: Grant
    Filed: October 23, 2015
    Date of Patent: June 19, 2018
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Keiji Nakagawa, Ryuta Nishizawa
  • Publication number: 20180100775
    Abstract: A physical quantity detecting device includes a vibrating element and a charge amplifier. The vibrating element includes a first detection electrode, a second detection electrode, a third detection electrode, and a fourth detection electrode. The first and fourth detection electrodes have the same electrical polarity, the second and third detection electrodes have the same electrical polarity, and the first and second detection electrodes have opposite electrical polarities. The first and fourth detection electrodes are connected to the charge amplifier, and the second and third detection electrodes are connected to the charge amplifier.
    Type: Application
    Filed: December 12, 2017
    Publication date: April 12, 2018
    Inventors: Ryuta NISHIZAWA, Keiji NAKAGAWA, Keiichi YAMAGUCHI, Atsushi MATSUO, Fumio ICHIKAWA
  • Publication number: 20180045609
    Abstract: A tire gripping device includes a chuck mechanism having a pair of chuck portions adjacent in a width direction of a tire and contact members disposed on each of the chuck portions in a circumferential manner. The contact members are able to be brought into contact with an open end portion of a bead portion of the tire. The contact members are able to enter a state of allowing relative movement with a contact surface of an open end portion in a first contact stage and enter a state of non-relative movement with the contact surface in a second contact stage subsequent to the first contact stage. The tire gripping device further includes a first driving mechanism for moving the contact members in a radial direction of the tire and a second driving mechanism for moving the pair of chuck portions in the width direction of the tire.
    Type: Application
    Filed: January 19, 2016
    Publication date: February 15, 2018
    Inventors: Keiji Nakagawa, Hirofumi Matsuo, Michihiko Yoshimura, Shonosule Motomiya
  • Patent number: 9874484
    Abstract: A physical quantity detecting device includes a vibrating element and a charge amplifier. The vibrating element includes a first detection electrode, a second detection electrode, a third detection electrode, and a fourth detection electrode. The first and fourth detection electrodes have the same electrical polarity, the second and third detection electrodes have the same electrical polarity, and the first and second detection electrodes have opposite electrical polarities. The first and fourth detection electrodes are connected to the charge amplifier, and the second and third detection electrodes are connected to the charge amplifier.
    Type: Grant
    Filed: March 23, 2015
    Date of Patent: January 23, 2018
    Assignee: Seiko Epson Corporation
    Inventors: Ryuta Nishizawa, Keiji Nakagawa, Keiichi Yamaguchi, Atsushi Matsuo, Fumio Ichikawa
  • Patent number: 9696156
    Abstract: An vibrating gyro device includes a base, drive vibrating arms extending from one end of the base, and detection vibrating arms extending from the other end of the base that faces away from the one end, and an adjustment film is provided on each of the drive vibrating arms in an area close to the base.
    Type: Grant
    Filed: March 20, 2013
    Date of Patent: July 4, 2017
    Assignee: Seiko Epson Corporation
    Inventors: Keiji Nakagawa, Ryuta Nishizawa
  • Patent number: 9683843
    Abstract: A vibrator element has a first vibration mode in which first and second detection portions perform flexural vibration in opposite directions in the opposite phase to first and second driving portions which vibrate in opposite directions according to a Coriolis force, and a second vibration mode in which the first and second detection portions perform flexural vibration in opposite directions in the same phase as the first and second driving portions which vibrate in opposite directions according to a Coriolis force. A ratio r=R2/R1 of equivalent series resistance R2 at the time of the second vibration mode to equivalent series resistance R1 at the time of the first vibration mode is set between 0.15 and 6.0.
    Type: Grant
    Filed: March 26, 2014
    Date of Patent: June 20, 2017
    Assignee: Seiko Epson Corporation
    Inventors: Keiji Nakagawa, Ryuta Nishizawa
  • Patent number: 9587944
    Abstract: An angular velocity sensor includes fixing units, a base portion, beam portions that support the base portion with respect to the fixing units, driving vibrating arms connected to the base portion, and detection vibrating arms connected to the base portion. When a width of a detection frequency band is set to f1 [Hz], a resonance frequency in a rotational vibration mode in which the base portion rotates and vibrates around a detection axis with respect to the fixing units in association with the deformation of the beam portions is set to f2 [Hz], and a detuning frequency is set to f3 [Hz], the relation of f1<f2<f3 is satisfied.
    Type: Grant
    Filed: October 30, 2014
    Date of Patent: March 7, 2017
    Assignee: Seiko Epson Corporation
    Inventors: Ryuta Nishizawa, Keiji Nakagawa, Norifumi Shimizu
  • Publication number: 20170059393
    Abstract: A gyro vibrating element includes a drive signal pattern including a drive signal electrode to which a drive signal is applied and a drive signal wire connected to the drive signal electrode, a first detection signal pattern including a first detection electrode that outputs a first detection signal and a first detection signal wire connected to the first detection electrode, the first detection signal pattern being capacitively coupled to the drive signal pattern, and a second detection signal pattern including a second detection electrode that outputs a second detection signal opposite in phase to the first detection signal and a second detection signal wire connected to the second detection electrode, the second detection signal pattern being capacitively coupled to the drive signal pattern. Any one of the first detection signal pattern, the second detection signal pattern, and the drive signal pattern includes an adjustment pattern for adjusting an area of the signal pattern.
    Type: Application
    Filed: August 23, 2016
    Publication date: March 2, 2017
    Inventors: Ryuta Nishizawa, Keiichi Yamaguchi, Keiji Nakagawa
  • Patent number: 9581446
    Abstract: A vibrating element includes: drive vibrating arm supported to the base portion and extending in a direction of the second axis; and detection vibrating arm supported to the base portion at a position different from the drive vibrating arm and extending in the direction of the second axis. When the vibrating element is subjected to rotation about the second axis while the drive vibrating arm being reciprocally driven in a direction of the first axis, an amount of displacement of the detection vibrating arm in a direction of the third axis at a position distant from the base portion by a distance y1 along the direction of the second axis is greater than an amount of displacement of the drive vibrating arm in the direction of the third axis at a position distant from the base portion by the distance y1 along the direction of the second axis.
    Type: Grant
    Filed: October 30, 2014
    Date of Patent: February 28, 2017
    Assignee: Seiko Epson Corporation
    Inventor: Keiji Nakagawa
  • Patent number: 9523578
    Abstract: A vibrating element includes a vibrating arm for detection. An electrode is provided on the vibrating arm for detection. A wiring line is connected to the electrode. The wiring line is arranged on a piezoelectric body of a base portion. At least a part of the wiring line is an electrode for adjustment. The electrode for adjustment generates an electrical signal with an opposite phase to an output signal of leak vibration of the vibrating arm for detection.
    Type: Grant
    Filed: April 19, 2016
    Date of Patent: December 20, 2016
    Assignee: Seiko Epson Corporation
    Inventors: Ryuta Nishizawa, Keiji Nakagawa, Takayuki Kikuchi