Patents by Inventor Kohei Shibata

Kohei Shibata 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: 9448424
    Abstract: An optical module connected to an optical fiber for transmitting light includes: a substrate; a ferrule that is formed from a material capable of transmitting therethrough light having a predetermined wavelength, accommodates an end of the optical fiber, and is fixed on the substrate with a fixing agent cured by being irradiated with the light capable of passing through the material; and a semiconductor chip that is disposed on the substrate and modulates light emitted from the end of the optical fiber accommodated in the ferrule.
    Type: Grant
    Filed: February 24, 2015
    Date of Patent: September 20, 2016
    Assignee: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventors: Kohei Shibata, Seimi Sasaki, Teruhiro Kubo, Shinji Maruyama, Shintaro Takeuchi, Hiroshi Kato, Takehito Tanaka
  • Patent number: 9417686
    Abstract: A method for controlling power in a computer system having a network device and a wakeup function is disclosed. A determination is made whether or not the network device is in an associated state at the time when the computer system moves into a power saving mode. In response to a determination that the network device is not in the associated state, power supply is turned off from a power source to the network device. In response to a determination that the network device is in the associated state, power supply is continually provided from the power source to the network device.
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: August 16, 2016
    Assignee: Lenovo (Singapore) PTE LTD.
    Inventors: Yasumichi Tsukamoto, Kohei Shibata
  • Patent number: 9405081
    Abstract: An optical transmitting apparatus includes: a substrate; optical modulators that are arranged in parallel to one another on the substrate and modulate light; waveguides that are formed on the substrate and guide signal light represented by at least one of modulated light beams obtained by the light being modulated by the plurality of optical modulators and monitor light represented by at least another one of the modulated light beams other than the signal light; lenses that collimate the signal light and the monitor light emitted from the waveguides; and a holding member that causes the signal light and the monitor light to be emitted from the lenses in mutually-different directions, by holding the lenses in such a manner that the optical axis of at least one of the lenses is out of alignment in a predetermined direction with the optical axis of at least one of the waveguides.
    Type: Grant
    Filed: February 24, 2015
    Date of Patent: August 2, 2016
    Assignee: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventors: Shinji Maruyama, Seimi Sasaki, Kohei Shibata, Teruhiro Kubo, Shintaro Takeuchi, Hiroshi Kato, Takehito Tanaka
  • Patent number: 9397756
    Abstract: An optical receiver including a waveguide substrate including a first waveguide that transmits a main signal beam, a second waveguide that transmits a monitoring beam that has branched from the main signal beam, and a third waveguide that transmits an amplification beam to amplify the main signal beam; a light receiving device array including, integrally formed to the same substrate, a first light receiving device that detects the main signal beam and a second light receiving device that detects the monitoring beam; and a case that houses the waveguide substrate and the light receiving device array. The first light receiving device faces toward an end of the first waveguide, and the second light receiving device faces toward an end of the second waveguide.
    Type: Grant
    Filed: August 8, 2014
    Date of Patent: July 19, 2016
    Assignee: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventor: Kohei Shibata
  • Publication number: 20160153527
    Abstract: An actuator comprises a motor including a rotation shaft; an output shaft disposed coaxially to the rotation shaft; a rotation shaft side gear rotatable as a unit with the rotation shaft; an output shaft side gear rotatable as a unit with the output shaft; an intermediate gear configuration body that includes a first intermediate gear and a second intermediate gear and that meshes with the rotation shaft side gear and the output shaft side gear; a first bearing supporting an end portion of the intermediate gear configuration body at a side of the first intermediate gear; and a second bearing supporting another end portion of the intermediate gear configuration body at a side of the second intermediate gear; wherein the second intermediate gear is rotatable as a unit with the first intermediate gear and is disposed further to a radial direction outside of the motor than the first intermediate gear.
    Type: Application
    Filed: November 27, 2015
    Publication date: June 2, 2016
    Inventors: Shinichi OKADA, Yasuhide ITO, Kohei SHIBATA, Takafumi NEGI
  • Patent number: 9188761
    Abstract: An optical device includes: an optical component; a case air-sealed, and made of metal, the optical component being secured within the case; and a lens provided within the case, and positionally adjusted in consideration of a deformation of the case air-sealed, light emitted from the optical component passing through the lens or light traveling to the optical component passing through the lens.
    Type: Grant
    Filed: January 25, 2011
    Date of Patent: November 17, 2015
    Assignee: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventors: Ryuichi Yoshida, Kohei Shibata, Toshiya Kishida, Hiroyuki Furukawa
  • Publication number: 20150253506
    Abstract: A first lens transmits a beam of light having a vertical cross-sectional diameter made closer to a horizontal cross-sectional diameter. The beam of light is emitted from an optical waveguide on a substrate and configured such that the vertical cross-sectional diameter which is the diameter of a vertical cross section along the direction of the thickness of the substrate is greater than the horizontal cross-sectional diameter which is the diameter of a horizontal cross section along the direction of the width of the substrate. A second lens is disposed at a position, at which the vertical cross-sectional diameter and the horizontal cross-sectional diameter coincide with each other, so as to focus the beam of light on the optical fiber. The position is closer to the optical fiber than the first lens along the direction of travel of the beam of light transmitted by the first lens.
    Type: Application
    Filed: February 25, 2015
    Publication date: September 10, 2015
    Applicant: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventors: Shinji MARUYAMA, Seimi Sasaki, Kohei Shibata, Teruhiro Kubo, Shintaro Takeuchi, Hiroshi Kato, Takehito Tanaka
  • Publication number: 20150253595
    Abstract: An optical module connected to an optical fiber for transmitting light includes: a substrate; a ferrule that is formed from a material capable of transmitting therethrough light having a predetermined wavelength, accommodates an end of the optical fiber, and is fixed on the substrate with a fixing agent cured by being irradiated with the light capable of passing through the material; and a semiconductor chip that is disposed on the substrate and modulates light emitted from the end of the optical fiber accommodated in the ferrule.
    Type: Application
    Filed: February 24, 2015
    Publication date: September 10, 2015
    Applicant: Fujitsu Optical Components Limited
    Inventors: Kohei Shibata, Seimi Sasaki, Teruhiro Kubo, Shinji Maruyama, Shintaro Takeuchi, Hiroshi Kato, Takehito Tanaka
  • Publication number: 20150253582
    Abstract: A polarization combiner includes: a base member that includes a body portion, an arm portion extending from the body portion, and a notch portion surrounded with the body portion and the arm portion; a polarization rotating element that is fixed to the arm portion of the base member and that rotates a polarization direction of a first polarized wave; and a polarization combining element that is fixed to the base member so as to face the notch portion of the base member and the polarization rotating element, the polarization combining element combining two polarized waves entering from a surface facing the notch portion and the polarization rotating element, the two polarized waves including the first polarized wave whose polarization direction is rotated by the polarization rotating element and a second polarized wave passing the notch portion.
    Type: Application
    Filed: February 9, 2015
    Publication date: September 10, 2015
    Applicant: Fujitsu Optical Components Limited
    Inventors: Seimi SASAKI, Kohei SHIBATA, Teruhiro KUBO, Shinji MARUYAMA, Shintaro TAKEUCHI, Hiroshi KATO, Takehito TANAKA
  • Publication number: 20150253521
    Abstract: An optical transmitting apparatus includes: a substrate; optical modulators that are arranged in parallel to one another on the substrate and modulate light; waveguides that are formed on the substrate and guide signal light represented by at least one of modulated light beams obtained by the light being modulated by the plurality of optical modulators and monitor light represented by at least another one of the modulated light beams other than the signal light; lenses that collimate the signal light and the monitor light emitted from the waveguides; and a holding member that causes the signal light and the monitor light to be emitted from the lenses in mutually-different directions, by holding the lenses in such a manner that the optical axis of at least one of the lenses is out of alignment in a predetermined direction with the optical axis of at least one of the waveguides.
    Type: Application
    Filed: February 24, 2015
    Publication date: September 10, 2015
    Applicant: Fujitsu Optical Components Limited
    Inventors: Shinji MARUYAMA, Seimi SASAKI, Kohei SHIBATA, Teruhiro KUBO, Shintaro TAKEUCHI, Hiroshi KATO, Takehito TANAKA
  • Patent number: 9081069
    Abstract: A protection IC connected to cell groups of a secondary battery assembly of a secondary battery connected in series and monitoring battery voltages of the cells in the cell groups, including terminals connected to connection points of the cells in the cell groups and both ends of the cell groups; a first alarm generating portion detecting an overvoltage by comparing voltages of the cells of the cell groups on both ends of the cells and generates the first alarm signal; and a second alarm generating portion detecting disconnection in connection points of the cells and disconnection between the connection points of the cell groups and the both ends and the terminals by detecting voltage drop or current decrement at the connection points of the cells of the cell groups and at one end of the cell groups in the cells, and generates a second alarm signal.
    Type: Grant
    Filed: January 17, 2014
    Date of Patent: July 14, 2015
    Assignee: MITSUMI ELECTRIC CO., LTD.
    Inventor: Kohei Shibata
  • Patent number: 9048672
    Abstract: A semiconductor integrated circuit that protects a secondary battery by controlling an on/off status of a discharge control switch and a charge control switch includes an over discharge detection part configured to detect an over discharge condition based on a battery voltage of the secondary battery, a load removal detection part to detect whether a load connected to the secondary battery is removed based on a voltage of a load removal detection terminal connected to a negative electrode side of at least one of the load connected to the secondary battery and a battery charger through a resistor, an over discharge return part to return to a normal condition from the over discharge condition, and a control part to output a control signal for returning the over discharge condition to the normal condition to the over discharge return part upon detecting the load being removed in the over discharge condition.
    Type: Grant
    Filed: August 9, 2012
    Date of Patent: June 2, 2015
    Assignee: MITSUMI ELECTRIC CO., LTD.
    Inventor: Kohei Shibata
  • Publication number: 20150145484
    Abstract: A protection circuit for protecting a secondary battery includes a controller that closes a charging path for charging the secondary battery with a charger when a charge preventing condition is satisfied, the charging path being between a terminal of the secondary battery and an input-output terminal for connecting the charger and an electronic apparatus, opens the charging path when a discharging current from the secondary battery to the electronic apparatus is detected while the charge preventing condition is satisfied and the charging path is closed, and temporarily closes the charging path when a predetermined period of time passes after the charging path is opened, to determine whether the discharging current is flowing.
    Type: Application
    Filed: November 17, 2014
    Publication date: May 28, 2015
    Applicant: MITSUMI ELECTRIC CO., LTD.
    Inventors: Kohei SHIBATA, Hibiki YANO
  • Publication number: 20150117865
    Abstract: A housing accommodates an optical waveguide substrate, plural signal light receiving elements, and a signal-light-level monitoring light receiving element. Signal light and locally oscillated light are input into optical waveguides in the optical waveguide substrate from a first end face of the optical waveguide substrate. The plural signal light receiving elements are disposed aligned on a side of a second end face opposite to a side of the first end face of the optical waveguide substrate. The signal-light-level monitoring light receiving element is disposed on a side of a third end face or a fourth end face between the first end face and the second end face of the optical waveguide substrate and at a position closer to the first end face than to the second end face.
    Type: Application
    Filed: September 26, 2014
    Publication date: April 30, 2015
    Applicant: Fujitsu Optical Components Limited
    Inventors: Hirohiko SONODA, Kohei SHIBATA, Takuya NAKAO, Yasuhiro YAMAUCHI, Ryuichi YOSHIDA, Hiroyuki FURUKAWA
  • Publication number: 20140348517
    Abstract: An optical receiver including a waveguide substrate including a first waveguide that transmits a main signal beam, a second waveguide that transmits a monitoring beam that has branched from the main signal beam, and a third waveguide that transmits an amplification beam to amplify the main signal beam; a light receiving device array including, integrally formed to the same substrate, a first light receiving device that detects the main signal beam and a second light receiving device that detects the monitoring beam; and a case that houses the waveguide substrate and the light receiving device array. The first light receiving device faces toward an end of the first waveguide, and the second light receiving device faces toward an end of the second waveguide.
    Type: Application
    Filed: August 8, 2014
    Publication date: November 27, 2014
    Applicant: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventor: Kohei SHIBATA
  • Publication number: 20140210612
    Abstract: A protection IC connected to cell groups of a secondary battery assembly of a secondary battery connected in series and monitoring battery voltages of the cells in the cell groups, including terminals connected to connection points of the cells in the cell groups and both ends of the cell groups; a first alarm generating portion detecting an overvoltage by comparing voltages of the cells of the cell groups on both ends of the cells and generates the first alarm signal; and a second alarm generating portion detecting disconnection in connection points of the cells and disconnection between the connection points of the cell groups and the both ends and the terminals by detecting voltage drop or current decrement at the connection points of the cells of the cell groups and at one end of the cell groups in the cells, and generates a second alarm signal.
    Type: Application
    Filed: January 17, 2014
    Publication date: July 31, 2014
    Applicant: MITSUMI ELECTRIC CO., LTD.
    Inventor: Kohei SHIBATA
  • Patent number: 8477409
    Abstract: Disclosed are a PLC-type delay demodulation circuit and a PLC-type optical interferometer capable of reducing the size of a PLC chip with respect to the arrangement of various kinds of light output waveguides. In a PLC-type delay demodulation circuit, arm waveguides of a first MZI and arm waveguides of a second MZI are formed so as to overlap each other in the same region of a planar lightwave circuit. The optical paths of the MZIs are arranged such that the propagation directions of two DQPSK signals branched by a Y-branch waveguide are opposite to each other.
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: July 2, 2013
    Assignees: Furakawa Electric Co., Ltd., Fujitsu Optical Components Limited
    Inventors: Hiroshi Kawashima, Kazutaka Nara, Kohei Shibata
  • Publication number: 20130057221
    Abstract: A semiconductor integrated circuit that protects a secondary battery by controlling an on/off status of a discharge control switch and a charge control switch includes an over discharge detection part configured to detect an over discharge condition based on a battery voltage of the secondary battery, a load removal detection part to detect whether a load connected to the secondary battery is removed based on a voltage of a load removal detection terminal connected to a negative electrode side of at least one of the load connected to the secondary battery and a battery charger through a resistor, an over discharge return part to return to a normal condition from the over discharge condition, and a control part to output a control signal for returning the over discharge condition to the normal condition to the over discharge return part upon detecting the load being removed in the over discharge condition.
    Type: Application
    Filed: August 9, 2012
    Publication date: March 7, 2013
    Applicant: MITSUMI ELECTRIC CO., LTD.
    Inventor: Kohei SHIBATA
  • Publication number: 20130010350
    Abstract: Disclosed are a PLC-type delay demodulation circuit and a PLC-type optical interferometer capable of reducing the size of a PLC chip with respect to the arrangement of various kinds of light output waveguides. In a PLC-type delay demodulation circuit, arm waveguides of a first MZI and arm waveguides of a second MZI are formed so as to overlap each other in the same region of a planar lightwave circuit. The optical paths of the MZIs are arranged such that the propagation directions of two DQPSK signals branched by a Y-branch waveguide are opposite to each other.
    Type: Application
    Filed: September 13, 2012
    Publication date: January 10, 2013
    Applicants: FUJITSU OPTICAL COMPONENTS LIMITED, FURUKAWA ELECTRIC CO., LTD.
    Inventors: Hiroshi KAWASHIMA, Kazutaka Nara, Kohei Shibata
  • Patent number: 8285088
    Abstract: A wavelength selective switch for suppressing degradation of pass band characteristics when the temperature rises. The wavelength selective switch includes a spectroscopic element for separating input light and providing angular dispersion depending on wavelengths, a collective lens for gathering light output from the spectroscopic element, and a movable reflection block which includes a plurality of mirrors arranged in the direction of angular dispersion made by the spectroscopic element, changes the angles of the mirrors in a direction differing from the direction of angular dispersion, and reflects the light coming from the collective lens. The collective lens is fixed at one end with respect to the direction of angular dispersion, expands with heat in a direction in which it is not fixed when the temperature rises, and outputs the light in a direction opposite to the direction in which the angle of light output from the spectroscopic element changes.
    Type: Grant
    Filed: February 5, 2008
    Date of Patent: October 9, 2012
    Assignee: Fujitsu Limited
    Inventors: Hirofumi Aota, Kohei Shibata, Tsuyoshi Yamamoto