Patents by Inventor Hiroyuki Itoh

Hiroyuki Itoh 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: 10559509
    Abstract: In order to address the problem in that, by increasing the gate resistance of a power semiconductor element, while variation of switching time can be controlled, loss due to the gate resistance becomes larger and power efficiency for the entire system is lowered, the present invention provides an insulating substrate capable of uniformizing switching speeds of circuit elements while suppressing influence on power efficiency of the circuit elements. In the insulating substrate according to the present invention, part of a wiring layer is formed as a control signal circuit layer, and part of the control signal circuit layer is formed as a resistance layer that increases input resistance when the circuit element receives a control signal.
    Type: Grant
    Filed: August 9, 2017
    Date of Patent: February 11, 2020
    Assignee: Hitachi Metals, Ltd.
    Inventors: Hiroshi Hozoji, Kenji Hayashi, Hiroyuki Itoh, Hisayuki Imamura, Hiroyuki Nagatomo
  • Publication number: 20190221489
    Abstract: In order to address the problem in that, by increasing the gate resistance of a power semiconductor element, while variation of switching time can be controlled, loss due to the gate resistance becomes larger and power efficiency for the entire system is lowered, the present invention provides an insulating substrate capable of uniformizing switching speeds of circuit elements while suppressing influence on power efficiency of the circuit elements. In the insulating substrate according to the present invention, part of a wiring layer is formed as a control signal circuit layer, and part of the control signal circuit layer is formed as a resistance layer that increases input resistance when the circuit element receives a control signal.
    Type: Application
    Filed: August 9, 2017
    Publication date: July 18, 2019
    Applicant: HITACHI METALS, LTD.
    Inventors: Hiroshi HOZOJI, Kenji HAYASHI, Hiroyuki ITOH, Hisayuki IMAMURA, Hiroyuki NAGATOMO
  • Publication number: 20190047915
    Abstract: The present invention focuses on a silicon nitride substrate having high mechanical strength, high thermal conductivity and the like, and takes advantage of such properties to provide: a ceramic substrate capable of providing improvement in a bonding property between a silicon nitride substrate and a ceramic layer which uses a dielectric ceramic material capable of being simultaneously sintered with a low-resistance conductive material such as a low-melting metal (Ag or Cu); and a method for producing the ceramic substrate. The ceramic substrate of the present invention is obtained by stacking and bonding a silicon nitride substrate and a ceramic layer composed of a dielectric ceramic material, wherein: the dielectric ceramic material contains Mg, Al, and Si as main ingredients, and Bi or B as an accessory ingredient; and the ceramic layer includes a region with a high Si element concentration at a bonding interface with the silicon nitride substrate.
    Type: Application
    Filed: March 10, 2017
    Publication date: February 14, 2019
    Applicant: HITACHI METALS, LTD.
    Inventors: Hiroyuki ITOH, Shinroh ITOH
  • Publication number: 20170149495
    Abstract: A transmitting device that transmits light to another transmitting device, includes: a variable attenuator configured to attenuate intensity of light; a drive circuit configured to control an amount of attenuation of the light in the variable attenuator at given intervals; and a detector configured to detect a failure of the drive circuit based on whether or not the amount of attenuation of the light in the variable attenuator changes at the given intervals.
    Type: Application
    Filed: September 21, 2016
    Publication date: May 25, 2017
    Applicant: FUJITSU LIMITED
    Inventor: Hiroyuki Itoh
  • Patent number: 9190801
    Abstract: An apparatus and method of failure detection in optical amplifier is disclosed. The optical amplifier includes an optical amplifying fiber configured to receive input light so that the input light travels through the optical amplifying fiber, an excitation light generator configured to supply excitation light to the optical amplifying fiber to optically amplify the input light as the input light travels through the optical amplifying fiber, and a processor configured to determine whether a failure has occurred in the optical amplifier, based on a change in power of the excitation light and a change in power of the input light.
    Type: Grant
    Filed: October 17, 2013
    Date of Patent: November 17, 2015
    Assignee: FUJITSU LIMITED
    Inventor: Hiroyuki Itoh
  • Patent number: 9095604
    Abstract: The purpose of the present invention is to provide a probiotic(s) which can activate an aromatic hydrocarbon receptor (AhR) and can consequently prevent inflammatory damage in the digestive tract. The present invention relates to; a probiotic(s) capable of activating an AhR; an anti-inflammatory agent comprising the probiotic(s); an orally ingestible composition containing the anti-inflammatory agent; and a method for screening for the probiotic(s).
    Type: Grant
    Filed: September 8, 2011
    Date of Patent: August 4, 2015
    Assignee: Meiji Co, Ltd.
    Inventors: Shuji Ikegami, Seiya Makino, Takayuki Toshimitsu, Hiroyuki Itoh, Atsuhito Nakao
  • Patent number: 8997335
    Abstract: A method of manufacturing a magnetic head includes the steps of: forming a pole-layer-encasing layer having a pole-layer-encasing section; and forming a pole layer in the pole-layer-encasing section. The pole layer includes a first layer, and a second layer formed thereon. The step of forming the pole layer includes the steps of: forming an initial first layer by physical vapor deposition; etching the surface of the initial first layer by dry etching so that the initial first layer becomes the first layer; and forming the second layer on the first layer.
    Type: Grant
    Filed: April 5, 2012
    Date of Patent: April 7, 2015
    Assignee: Headway Technologies, Inc.
    Inventors: Yoshitaka Sasaki, Hiroyuki Itoh, Shigeki Tanemura, Hironori Araki, Kazuo Ishizaki, Takehiro Horinaka
  • Patent number: 8922878
    Abstract: An optical amplifier includes: a rare-earth doped fiber configured to amplify signal light to thereby produce a amplified signal light; a gain control circuit configured to control an optical gain of the rare-earth doped fiber; a photodetector configured to detect intensities of different wavelength of light obtained from the amplified signal light; and an abnormality detection circuit configured to detect an abnormality of the signal light in accordance with a ratio or a difference between the intensities of the different wavelength.
    Type: Grant
    Filed: May 29, 2013
    Date of Patent: December 30, 2014
    Assignee: Fujitsu Limited
    Inventor: Hiroyuki Itoh
  • Publication number: 20140158867
    Abstract: An optical amplifier includes an optical amplifying fiber configured to receive input light so that the input light travels through the optical amplifying fiber; an excitation light generator configured to supply excitation light to the optical amplifying fiber to optically amplify the input light as the input light travels through the optical amplifying fiber; and a processor configured to determine whether a failure has occurred in the optical amplifier, based on a change in power of the excitation light and a change in power of the input light.
    Type: Application
    Filed: October 17, 2013
    Publication date: June 12, 2014
    Applicant: FUJITSU LIMITED
    Inventor: Hiroyuki ITOH
  • Patent number: 8687320
    Abstract: A magnetic head includes a pole layer accommodated in a groove. The pole layer has a track width defining portion and a wide portion. The pole layer includes a plurality of magnetic films stacked. At least one of the plurality of magnetic films includes a first portion included in the track width defining portion, a second portion included in the wide portion, and a third portion coupling the first and second portions to each other. In a cross section passing through the center of the pole layer taken in the track width direction, the second portion is smaller than the first portion in thickness and the top surface of the third portion is inclined with respect to a direction perpendicular to a medium facing surface.
    Type: Grant
    Filed: April 5, 2012
    Date of Patent: April 1, 2014
    Assignee: Headway Technologies, Inc.
    Inventors: Yoshitaka Sasaki, Hiroyuki Itoh, Shigeki Tanemura, Hironori Araki, Kazuo Ishizaki, Takehiro Horinaka
  • Publication number: 20140029082
    Abstract: An optical amplifier includes: a rare-earth doped fiber configured to amplify signal light to thereby produce a amplified signal light; a gain control circuit configured to control an optical gain of the rare-earth doped fiber; a photodetector configured to detect intensities of different wavelength of light obtained from the amplified signal light; and an abnormality detection circuit configured to detect an abnormality of the signal light in accordance with a ratio or a difference between the intensities of the different wavelength.
    Type: Application
    Filed: May 29, 2013
    Publication date: January 30, 2014
    Applicant: FUJITSU LIMITED
    Inventor: Hiroyuki ITOH
  • Publication number: 20130302844
    Abstract: The purpose of the present invention is to provide a probiotic(s) which can activate an aromatic hydrocarbon receptor (AhR) and can consequently prevent inflammatory damage in the digestive tract. The present invention relates to; a probiotic(s) capable of activating an AhR; an anti-inflammatory agent comprising the probiotic(s); an orally ingestible composition containing the anti-inflammatory agent; and a method for screening for the probiotic(s).
    Type: Application
    Filed: September 8, 2011
    Publication date: November 14, 2013
    Applicant: Meiji Co., Ltd.
    Inventors: Shuji Ikegami, Seiya Makino, Takayuki Toshimitsu, Hiroyuki Itoh, Atsuhito Nakao
  • Patent number: 8467147
    Abstract: A magnetic head comprises a pole layer, a first coil, a second coil, and a shield. The shield incorporates: a first portion located backward of the pole layer along the direction of travel of a recording medium; a second portion located forward of the pole layer along the direction of travel of the recording medium; and two coupling portions. The first portion has an end face located in a medium facing surface. The two coupling portions couple the first and second portions to each other without touching the pole layer. Part of the first coil passes through a space surrounded by the pole layer and the first portion. Part of the second coil passes through a space surrounded by the pole layer and the second portion.
    Type: Grant
    Filed: October 13, 2006
    Date of Patent: June 18, 2013
    Assignees: Headway Technologies, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Itoh, Shigeki Tanemura, Tatsushi Shimizu, Tatsuya Shimizu
  • Patent number: 8453316
    Abstract: A method of forming a magnetic head comprises the steps of: selectively exposing through the use of a photomask a photoresist layer unpatterned; forming a pattern for forming a pole layer by developing the photoresist layer after the exposure; and forming the pole layer through the use of the pattern. The photomask includes first to third regions. The first region has such a perimeter that a projection image thereof is shaped along a perimeter of an ideal shape of the top surface of the pole layer. The second region touches the perimeter of the first region, and is located outside the first region. The third region is located inside the first region without touching the perimeter of the first region. The third region suppresses deviation of the pole layer from its desired shape which may be caused by the effect of light reflected while the photoresist layer is exposed.
    Type: Grant
    Filed: July 2, 2009
    Date of Patent: June 4, 2013
    Assignee: Headway Technologies, Inc.
    Inventors: Yoshitaka Sasaki, Kazuo Ishizaki, Hiroyuki Itoh
  • Patent number: 8427782
    Abstract: A magnetic layer for writing incorporates: a pole layer having an end face located in a medium facing surface and a lower yoke layer. A first magnetic layer for flux concentration is connected to the lower yoke layer at a location away from the medium facing surface, and passes a magnetic flux corresponding to a magnetic field generated by a first coil. A second magnetic layer for flux concentration is connected to the pole layer at a location away from the medium facing surface, and passes a magnetic flux corresponding to a magnetic field generated by a second coil. A nonmagnetic layer is disposed between the pole layer and the lower yoke layer. The lower yoke layer is connected to the pole layer at a location closer to the medium facing surface than the nonmagnetic layer.
    Type: Grant
    Filed: May 21, 2012
    Date of Patent: April 23, 2013
    Assignees: Headway Technology, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Itoh, Shigeki Tanemura, Tatsushi Shimizu, Tatsuya Shimizu
  • Patent number: 8422121
    Abstract: An optical transmission node including an optical preamplifier to amplify input light and an optical postamplifier to amplify light output from the optical preamplifier, includes the optical postamplifier configured to generate amplified spontaneous emission light without signals input, the optical preamplifier configured to amplify the amplified spontaneous emission light from the optical postamplifier, a loopback switch configured to discouple a path of the light output from the optical preamplifier to the optical postamplifier, and couple a path of the light output from the optical postamplifier to the optical preamplifier.
    Type: Grant
    Filed: June 15, 2010
    Date of Patent: April 16, 2013
    Assignee: Fujitsu Limited
    Inventors: Hiroyuki Itoh, Takuji Maeda
  • Publication number: 20120229932
    Abstract: A magnetic layer for writing incorporates: a pole layer having an end face located in a medium facing surface and a lower yoke layer. A first magnetic layer for flux concentration is connected to the lower yoke layer at a location away from the medium facing surface, and passes a magnetic flux corresponding to a magnetic field generated by a first coil. A second magnetic layer for flux concentration is connected to the pole layer at a location away from the medium facing surface, and passes a magnetic flux corresponding to a magnetic field generated by a second coil. A nonmagnetic layer is disposed between the pole layer and the lower yoke layer. The lower yoke layer is connected to the pole layer at a location closer to the medium facing surface than the nonmagnetic layer.
    Type: Application
    Filed: May 21, 2012
    Publication date: September 13, 2012
    Applicants: SAE MAGNETICS (H.K.) LTD., HEADWAY TECHNOLOGIES, INC.
    Inventors: Yoshitaka Sasaki, Hiroyuki Itoh, Shigeki Tanemura, Tatsushi Shimizu, Tatsuya Shimizu
  • Publication number: 20120210566
    Abstract: A method of manufacturing a magnetic head includes the steps of: forming a pole-layer-encasing layer having a pole-layer-encasing section; and forming a pole layer in the pole-layer-encasing section. The pole layer includes a first layer, and a second layer formed thereon. The step of forming the pole layer includes the steps of: forming an initial first layer by physical vapor deposition; etching the surface of the initial first layer by dry etching so that the initial first layer becomes the first layer; and forming the second layer on the first layer.
    Type: Application
    Filed: April 5, 2012
    Publication date: August 23, 2012
    Applicant: Headway Technologies, Inc.
    Inventors: Yoshitaka SASAKI, Hiroyuki Itoh, Shigeki Tanemura, Hironori Araki, Kazuo Ishizaki, Takehiro Horinaka
  • Publication number: 20120212855
    Abstract: A magnetic head includes a pole layer accommodated in a groove. The pole layer has a track width defining portion and a wide portion. The pole layer includes a plurality of magnetic films stacked. At least one of the plurality of magnetic films includes a first portion included in the track width defining portion, a second portion included in the wide portion, and a third portion coupling the first and second portions to each other. In a cross section passing through the center of the pole layer taken in the track width direction, the second portion is smaller than the first portion in thickness and the top surface of the third portion is inclined with respect to a direction perpendicular to a medium facing surface.
    Type: Application
    Filed: April 5, 2012
    Publication date: August 23, 2012
    Applicant: HEADWAY TECHNOLOGIES, INC.
    Inventors: Yoshitaka Sasaki, Hiroyuki Itoh, Shigeki Tanemura, Hironori Araki, Kazuo Ishizaki, Takehiro Horinaka
  • Patent number: 8246020
    Abstract: A vibration isolator includes layered rubbers interposed between a support body and a movable body, and a pair of dampers attached to the support body at one ends and to the movable body at the other ends. The layered rubbers are arranged to be spaced apart in an anterior and posterior direction and in a left and right direction, with reference to a direction in which an operator faces when seated. One of the dampers is arranged at a position corresponding to a middle of the left and right direction between the layered rubbers arranged in the left and right direction, and aligned in the anterior and posterior direction. The other one of the dampers is arranged closer to an anterior side than a middle of the anterior and posterior direction between the layered rubbers arranged in the anterior and posterior direction, and aligned in the lift and right direction.
    Type: Grant
    Filed: March 13, 2008
    Date of Patent: August 21, 2012
    Assignee: Komatsu Ltd.
    Inventors: Shinya Nakamura, Toshio Yamashita, Shinji Mitsuta, Masatake Tamaru, Hiroyuki Itoh