Patents by Inventor Keiichi Yamaguchi

Keiichi Yamaguchi 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: 9341643
    Abstract: A vibrator element includes a pair of first and second drive vibrating arms that extend in opposite directions from a base portion; a first weight that is spaced from a tip of at least one of the first and second drive vibrating arms toward the base portion and is provided in a first region of the at least one of the drive vibrating arms; and a second weight that is provided in a second region that is a region between a tip of the first weight and the tip of the at least one of the drive vibrating arms. When an area of the first region is represented as A1, a mass of the first weight is represented as B1, an area of the second region is represented as A2, and a mass of the second weight is represented as B2, B1/A1>B2/A2 is established.
    Type: Grant
    Filed: July 22, 2013
    Date of Patent: May 17, 2016
    Assignee: Seiko Epson Corporation
    Inventors: Keiichi Yamaguchi, Seiichiro Ogura, Takayuki Kikuchi, Ryuta Nishizawa, Seiji Osawa
  • Publication number: 20160116286
    Abstract: An electronic device includes a vibration element having a detection signal electrode and a drive signal electrode, an IC disposed so as to be opposed to the vibration element, a first wiring pattern located between the IC and the vibration element, and electrically connected to the drive signal electrode, and a shield wiring pattern located on the vibration element side of the first wiring pattern, and electrically connected to a constant potential (ground).
    Type: Application
    Filed: October 19, 2015
    Publication date: April 28, 2016
    Inventors: Ryuta Nishizawa, Takashi Nomiya, Keiichi Yamaguchi
  • Patent number: 9306731
    Abstract: According to an embodiment, a signal processing apparatus includes a first switch, a second switch, a corrector and a circuit. The first switch selects one signal from a first signal group including a first signal and a first constant envelope signal to obtain a first selected signal. The second switch selects one signal from a second signal group including a second signal and a second constant envelope signal to obtain a second selected signal. The corrector corrects a characteristic of at least one of the first and second selected signals to obtain a first corrected signal and a second corrected signal. The circuit generates an output signal from the first corrected signal and the second corrected signal.
    Type: Grant
    Filed: January 12, 2015
    Date of Patent: April 5, 2016
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Makoto Tanahashi, Yoshimasa Egashira, Atsushi Yamaoka, Keiichi Yamaguchi
  • Patent number: 9270260
    Abstract: A distortion compensation device compensates a distortion component generated in a nonlinear circuit having a nonlinear input-output characteristic. The distortion compensation device includes a predistorter and an estimator. The predistorter converts an input signal into an inverse characteristic signal by using a compensation coefficient so that an estimation value of an inverse characteristic to the nonlinear input-output characteristic is given to the input signal. The estimator generates the compensation coefficient based on the input signal, the inverse characteristic signal and an output signal of the nonlinear circuit.
    Type: Grant
    Filed: March 7, 2014
    Date of Patent: February 23, 2016
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Makoto Tanahashi, Yoshimasa Egashira, Keiichi Yamaguchi
  • Patent number: 9209383
    Abstract: A vibrator includes: a vibrating reed having a vibrating body, first and second support portions supporting the vibrating body, and four beams coupling the first and second support portions with the vibrating body; electrodes disposed at the vibrating body; and terminals disposed at the first and second support portions and electrically connected with the electrodes via wires disposed at the beams. Between the terminals next to each other, a plurality of grooves spaced apart in a predetermined direction and extending in a direction intersecting the predetermined direction are disposed.
    Type: Grant
    Filed: November 13, 2012
    Date of Patent: December 8, 2015
    Assignee: Seiko Epson Corporation
    Inventors: Seiji Osawa, Keiichi Yamaguchi, Toshihiko Shiohara, Yuichi Isono, Takayuki Kikuchi
  • Publication number: 20150276769
    Abstract: A sample analyzer comprises an input to select a sample type to be measured from a plurality of platelet sample types of differing concentrations, a measurement part to obtain optical information of a sample, a processing part that calculates platelet aggregation information from the optical information, and an alarm part. The processing part determines whether the actual measured sample type differs from the inputted sample type based on the optical information from the measurement part, and actuates the alarm part accordingly.
    Type: Application
    Filed: March 27, 2015
    Publication date: October 1, 2015
    Inventors: Keiichi YAMAGUCHI, Hiroshi KURONO, Katsushi KOBAYASHI
  • Publication number: 20150268107
    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: March 23, 2015
    Publication date: September 24, 2015
    Inventors: Ryuta NISHIZAWA, Keiji NAKAGAWA, Keiichi YAMAGUCHI, Atsushi MATSUO, Fumio ICHIKAWA
  • Publication number: 20150249533
    Abstract: According to an embodiment, a signal processing apparatus includes a first switch, a second switch, a corrector and a circuit. The first switch selects one signal from a first signal group including a first signal and a first constant envelope signal to obtain a first selected signal. The second switch selects one signal from a second signal group including a second signal and a second constant envelope signal to obtain a second selected signal. The corrector corrects a characteristic of at least one of the first and second selected signals to obtain a first corrected signal and a second corrected signal. The circuit generates an output signal from the first corrected signal and the second corrected signal.
    Type: Application
    Filed: January 12, 2015
    Publication date: September 3, 2015
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Makoto TANAHASHI, Yoshimasa EGASHIRA, Atsushi YAMAOKA, Keiichi YAMAGUCHI
  • Publication number: 20150162522
    Abstract: A vibration element includes a vibrating portion, a support portion that supports the vibrating portion, and a suspension arm that couples the vibrating portion to the support portion. In addition, the suspension arm includes a meandering portion extending out the support portion and an inclination portion that couples the meandering portion to the vibrating portion.
    Type: Application
    Filed: December 4, 2014
    Publication date: June 11, 2015
    Inventors: Seiichiro OGURA, Keiichi YAMAGUCHI, Ryuta NISHIZAWA, Takayuki KIKUCHI
  • Patent number: 9013093
    Abstract: A vibrating reed includes a vibrating body (a base portion, a vibrating arm, and a detection arm) and a support portion that supports the vibrating body via a plate-like coupling portion. In both principal surfaces of the coupling portion, grooves (a first groove and a second groove) are disposed. The first groove arranged in one of the principal surfaces of the coupling portion and the second groove arranged in the other principal surface are arranged at positions different from each other in plan view.
    Type: Grant
    Filed: May 30, 2013
    Date of Patent: April 21, 2015
    Assignee: Seiko Epson Corporation
    Inventors: Keiichi Yamaguchi, Seiji Osawa, Seiichiro Ogura, Takayuki Kikuchi
  • Publication number: 20150017934
    Abstract: An amplifying device of an embodiment includes: a first amplifier amplifying a first component of an input signal; a first output circuit having an input connected to an output of the first amplifier and converting impedance seen from an output of the first output circuit to make the converted impedance seen from the first amplifier; a second amplifier amplifying a second component of the input signal with a bias deeper than that of the first amplifier; a second output circuit having an input connected to an output of the second amplifier, having a longer electrical length than that of the first output circuit part, and converting impedance seen from an output of the second output circuit to make the converted impedance seen from the second amplifier; and a combiner combining the first component amplified by the first amplifier and the second component amplified by the second amplifier.
    Type: Application
    Filed: July 10, 2014
    Publication date: January 15, 2015
    Inventors: Atsushi YAMAOKA, Keiichi Yamaguchi
  • Publication number: 20140368251
    Abstract: A distortion compensation device compensates a distortion component generated in a nonlinear circuit having a nonlinear input-output characteristic. The distortion compensation device includes a predistorter and an estimator. The predistorter converts an input signal into an inverse characteristic signal by using a compensation coefficient so that an estimation value of an inverse characteristic to the nonlinear input-output characteristic is given to the input signal. The estimator generates the compensation coefficient based on the input signal, the inverse characteristic signal and an output signal of the nonlinear circuit.
    Type: Application
    Filed: March 7, 2014
    Publication date: December 18, 2014
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Makoto TANAHASHI, Yoshimasa EGASHIRA, Keiichi YAMAGUCHI
  • Publication number: 20140255254
    Abstract: In order to improve accuracy of determination of a blood coagulation time without requiring complicated work, a measurement unit 2 of a blood coagulation analyzer 1 irradiates a measurement specimen prepared by mixing a blood specimen and a reagent together, with lights of a plurality of wavelengths including light of a wavelength ?1 and light of a wavelength ?2, obtains information regarding an amount of transmitted light that transmits through the measurement specimen, and transmits the obtained information to a control device 4. The control device 4 calculates a blood coagulation time of the blood specimen based on information regarding a transmitted light amount based on light of the wavelength ?1. Moreover, the control device 4 determines whether a blood coagulation time can be appropriately obtained through the measurement, based on information regarding transmitted light amounts based on light of wavelength ?1 and light of wavelength ?2.
    Type: Application
    Filed: March 5, 2014
    Publication date: September 11, 2014
    Applicant: SYSMEX CORPORATION
    Inventors: Keiichi YAMAGUCHI, Yasuhiro TAKEUCHI, Hiroshi KURONO
  • Publication number: 20140077664
    Abstract: A gyro element as a vibrator element fulfills the relationship: |fd?fy1|>|fd?fy2|, where fd is a drive vibrational frequency of first through fourth drive vibration arms, fy1 is a y1-mode vibrational frequency of a y1 mode, in which a base section and the first through fourth drive vibration arms vibrate in the same direction along a first direction (a y-axis direction) in which the first drive vibration arm extends, and fy2 is a y2-mode vibrational frequency of a y2 mode in which the base section vibrates along the first direction and the first through fourth drive vibration arms vibrate along the first direction in an opposite direction to a direction in which the base section vibrates.
    Type: Application
    Filed: September 16, 2013
    Publication date: March 20, 2014
    Applicant: Seiko Epson Corporation
    Inventors: Seiichiro Ogura, Takayuki Kikuchi, Keiichi Yamaguchi
  • Publication number: 20140020503
    Abstract: A vibrator element includes a pair of first and second drive vibrating arms that extend in opposite directions from a base portion; a first weight that is spaced from a tip of at least one of the first and second drive vibrating arms toward the base portion and is provided in a first region of the at least one of the drive vibrating arms; and a second weight that is provided in a second region that is a region between a tip of the first weight and the tip of the at least one of the drive vibrating arms. When an area of the first region is represented as A1, a mass of the first weight is represented as B1, an area of the second region is represented as A2, and a mass of the second weight is represented as B2, B1/A1>B2/A2 is established.
    Type: Application
    Filed: July 22, 2013
    Publication date: January 23, 2014
    Inventors: Keiichi YAMAGUCHI, Seiichiro OGURA, Takayuki KIKUCHI, Ryuta NISHIZAWA, Seiji OSAWA
  • Patent number: 8631087
    Abstract: There is provided with a remote control method using a terminal device connected to a first network and an information processing server connected to a second network, including: setting a tunnel between the terminal device and the information processing server; transmitting a broadcast or multicast packet output from service providing servers on the first network to the information processing server via the tunnel to cause the server to find the service providing servers and services provided by the service providing servers; notifying the terminal device of the services found, from the information processing server via the tunnel or the second network; and if execution request of the service is received by the information processing server from the terminal device via the tunnel or the second network, conducting data communication concerning the service between a service providing server providing the service and the information processing server, via the second network.
    Type: Grant
    Filed: March 28, 2006
    Date of Patent: January 14, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kotaro Ise, Shinya Murai, Takuya Kawamura, Masataka Goto, Keiichi Yamaguchi
  • Publication number: 20130320816
    Abstract: A vibrator element includes a base section, and a vibrating arm projecting from the base section, and having a plurality of groove sections, the vibrating arm is provided with the groove sections, and the groove sections are each formed to have a length in a width direction of the vibrating arm longer than a length in a longitudinal direction of the vibrating arm, and arranged side by side along the longitudinal direction of the vibrating arm.
    Type: Application
    Filed: May 29, 2013
    Publication date: December 5, 2013
    Applicant: Seiko Epson Corporation
    Inventors: Keiichi Yamaguchi, Osamu Kawauchi
  • Publication number: 20130320812
    Abstract: A vibrating reed includes a vibrating body (a base portion, a vibrating arm, and a detection arm) and a support portion that supports the vibrating body via a plate-like coupling portion. In both principal surfaces of the coupling portion, grooves (a first groove and a second groove) are disposed. The first groove arranged in one of the principal surfaces of the coupling portion and the second groove arranged in the other principal surface are arranged at positions different from each other in plan view.
    Type: Application
    Filed: May 30, 2013
    Publication date: December 5, 2013
    Inventors: Keiichi YAMAGUCHI, Seiji OSAWA, Seiichiro OGURA, Takayuki KIKUCHI
  • Patent number: 8351875
    Abstract: A distortion compensator for reducing a level of a distortion component included in an output analog signal of an amplifier, includes: an A/D converter to convert the output analog signal of the amplifier into a digital output signal; a comparator to generate a distortion characteristic of the amplifier based on a digital input signal and the digital output signal; a rate controller to control a sampling rate of the A/D converter based on the digital input signal and the digital output signal; a predistorter to multiply the digital input signal and a compensation value for compensating the amplifier, the compensation value being calculated based on the digital input signal and the distortion characteristic of the amplifier; and a D/A converter to convert multiplication result of the predistorter into an analog input signal to input the analog input signal to the amplifier.
    Type: Grant
    Filed: September 15, 2009
    Date of Patent: January 8, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Takayuki Kato, Atsushi Yamaoka, Keiichi Yamaguchi
  • Patent number: 8237498
    Abstract: According to an embodiment, a Doherty amplifier system has a first Doherty amplifier and a second Doherty amplifier. The first Doherty amplifier operates in a SISO communication mode and in a MIMO communication mode. The first Doherty amplifier comprises a first carrier amplifier and a first peak amplifier. The second Doherty amplifier operates in the MIMO communication mode but not operates in the SISO communication mode. The second Doherty amplifier comprises a second carrier amplifier and a second peak amplifier. A distance between the first carrier amplifier and the second carrier amplifier is less than any of a distance between any of the first carrier amplifier and the second peak amplifier and any of the first peak amplifier and the second peak amplifier. In the SISO communication mode, heat generated by the first Doherty amplifier is conducted to the second Doherty amplifier to warm up the second Doherty amplifier.
    Type: Grant
    Filed: February 22, 2012
    Date of Patent: August 7, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Takayuki Kato, Atsushi Yamaoka, Keiichi Yamaguchi