Patents by Inventor Keiji Okumura

Keiji Okumura 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: 20170092743
    Abstract: A method for producing a semiconductor power device, includes forming a gate trench from a surface of a semiconductor layer toward an inside thereof. A first insulation film is formed on an inner surface of the gate trench. The method also includes removing a part on a bottom surface of the gate trench in the first insulation film. A second insulation film having a dielectric constant higher than SiO2 is formed in such a way as to cover the bottom surface of the gate trench exposed by removing the first insulation film.
    Type: Application
    Filed: September 9, 2016
    Publication date: March 30, 2017
    Applicant: ROHM CO., LTD.
    Inventors: Keiji OKUMURA, Mineo MIURA, Yuki NAKANO, Noriaki KAWAMOTO, Hidetoshi ABE
  • Publication number: 20170018536
    Abstract: A semiconductor device includes a MOSFET including a PN junction diode. A unipolar device is connected in parallel to the MOSFET and has two terminals. A first wire connects the PN junction diode to one of the two terminals of the unipolar device. A second wire connects the one of the two terminals of the unipolar device to an output line, so that the output line is connected to the MOSFET and the unipolar device via the first wire and the second wire. In one embodiment the connection of the first wire to the diode is with its anode, and in another the connection is with the cathode.
    Type: Application
    Filed: September 28, 2016
    Publication date: January 19, 2017
    Applicant: ROHM CO., LTD.
    Inventor: Keiji OKUMURA
  • Patent number: 9494910
    Abstract: An image forming apparatus includes an apparatus main body and a board holding member. The apparatus main body includes an image forming part. The board holding member is attached to the apparatus main body and configured to have a surface to which a board is fixed. The apparatus main body includes an engaging part and a supporting part. The engaging part is configured to engage with a side edge part of the board holding member. The supporting part is configured to support a part closer to an inside than the side edge part of the board holding member. The board holding member is rotated around the side edge part as a fulcrum so as to be opened and closed with respect to the apparatus main body.
    Type: Grant
    Filed: October 15, 2015
    Date of Patent: November 15, 2016
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Shinobu Ohata, Keiji Okumura
  • Patent number: 9461021
    Abstract: A semiconductor device includes a first chip including a PN junction diode, and a second chip including a Schottky barrier diode, connected in parallel to the first chip. A first inductive metal member has a first end connected to a cathode of the PN junction diode, and a second end connected to a cathode of the Schottky barrier diode. A second inductive metal member has a third end connected to the cathode of the Schottky barrier diode. An output line is connected to a fourth end of the second connection member, and electrically connected to the cathode of the PN junction diode via a first path formed by the first and second metal members, and to the cathode of the Schottky barrier diode via a second path formed by the second metal member and exclusive of the first metal member, so that the first path has greater inductance than the second.
    Type: Grant
    Filed: January 19, 2016
    Date of Patent: October 4, 2016
    Assignee: ROHM CO., LTD.
    Inventor: Keiji Okumura
  • Patent number: 9454129
    Abstract: An image forming apparatus includes an exterior cover having a plurality of faces. The exterior cover is configured so that one face of the plurality of faces is divided into a plurality of cover boards. The plurality of cover boards are configured so that adjacent cover boards of the plurality of cover boards include respective overlapping parts overlapping onto each other formed in the respective adjacent cover boards and the one face is composed by overlapping the overlapping parts from the outside in predetermined order.
    Type: Grant
    Filed: October 27, 2015
    Date of Patent: September 27, 2016
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Keiji Okumura
  • Patent number: 9442452
    Abstract: An image forming apparatus includes a unit, a high-voltage board and a connecting mechanism. The connecting mechanism includes a first connecting member, a first holding member, a coupling member and a second connecting member. The first connecting member includes a first spring terminal. The first spring terminal includes a first large diameter part and a first small diameter part. The first holding member has a first contact part coming into contact with an end part of the first small diameter part at a side of the first large diameter part in a state where the first holding member is coupled with the coupling member. The coupling member has a second contact part coming into contact with an end part of the first large diameter part at a side of the first small diameter part in the state where the first holding member is coupled with the coupling member.
    Type: Grant
    Filed: October 7, 2015
    Date of Patent: September 13, 2016
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Shinobu Ohata, Keiji Okumura
  • Patent number: 9434560
    Abstract: A holding member of a sheet feeder includes a locking member engageable with a part of a pinion gear and holds the pinion gear and a sensor member. The holding member is detachably attachable to the sheet storage portion. The pinion gear and a pair of rack members are meshed with the holding member attached to a sheet storage portion. The holding member holds the pinion gear movably in an axial direction of the rotary shaft so that the pinion gear is displaceable between a first position where the rotation of the pinion gear is regulated and a second position where the pinion gear is rotatable. The pinion gear is located at the first position with the holding member detached from the sheet storage portion and located at the second position with the holding member attached to the sheet storage portion.
    Type: Grant
    Filed: October 27, 2015
    Date of Patent: September 6, 2016
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Seiji Okada, Keiji Okumura
  • Publication number: 20160202895
    Abstract: A display control unit (23) scrollably displays a plurality of images to be displayed in a specific display area within a screen. An operation receiving unit (21) receives a scroll instruction and a display mode switching instruction that are issued in response to a user operation. When a display mode is switched, the display control unit (23) switches a display in the display area such that, among the plurality of images in the display area displayed in the first display mode, at least one image located as a position that goes out of the display area first upon scroll in a forward direction is arranged, upon a switch to a second display mode, at a position that also goes out of the display area first upon scroll in the forward direction in the display area.
    Type: Application
    Filed: March 23, 2016
    Publication date: July 14, 2016
    Applicant: OLYMPUS CORPORATION
    Inventors: Keiji OKUMURA, Koichi HIROSE, Toshiya NISHIMURA
  • Patent number: 9379634
    Abstract: A semiconductor device includes: a first output unit configured to output a first phase; a second output unit configured to output a second phase different from the first phase, the second output unit being disposed to be stacked on the first output unit; and a controller configured to control the output units.
    Type: Grant
    Filed: January 28, 2015
    Date of Patent: June 28, 2016
    Assignee: Rohm Co., Ltd.
    Inventors: Keiji Okumura, Takukazu Otsuka, Masao Saito
  • Publication number: 20160133609
    Abstract: A semiconductor device includes a first chip including a PN junction diode, and a second chip including a Schottky barrier diode, connected in parallel to the first chip. A first inductive metal member has a first end connected to a cathode of the PN junction diode, and a second end connected to a cathode of the Schottky barrier diode. A second inductive metal member has a third end connected to the cathode of the Schottky barrier diode. An output line is connected to a fourth end of the second connection member, and electrically connected to the cathode of the PN junction diode via a first path formed by the first and second metal members, and to the cathode of the Schottky barrier diode via a second path formed by the second metal member and exclusive of the first metal member, so that the first path has greater inductance than the second.
    Type: Application
    Filed: January 19, 2016
    Publication date: May 12, 2016
    Applicant: ROHM CO., LTD.
    Inventor: Keiji OKUMURA
  • Publication number: 20160124379
    Abstract: An image forming apparatus includes an exterior cover having a plurality of faces. The exterior cover is configured so that one face of the plurality of faces is divided into a plurality of cover boards. The plurality of cover boards are configured so that adjacent cover boards of the plurality of cover boards include respective overlapping parts overlapping onto each other formed in the respective adjacent cover boards and the one face is composed by overlapping the overlapping parts from the outside in predetermined order.
    Type: Application
    Filed: October 27, 2015
    Publication date: May 5, 2016
    Applicant: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventor: Keiji OKUMURA
  • Publication number: 20160122142
    Abstract: A holding member of a sheet feeder includes a locking member engageable with a part of a pinion gear and holds the pinion gear and a sensor member. The holding member is detachably attachable to the sheet storage portion. The pinion gear and a pair of rack members are meshed with the holding member attached to a sheet storage portion. The holding member holds the pinion gear movably in an axial direction of the rotary shaft so that the pinion gear is displaceable between a first position where the rotation of the pinion gear is regulated and a second position where the pinion gear is rotatable. The pinion gear is located at the first position with the holding member detached from the sheet storage portion and located at the second position with the holding member attached to the sheet storage portion.
    Type: Application
    Filed: October 27, 2015
    Publication date: May 5, 2016
    Inventors: Seiji Okada, Keiji Okumura
  • Publication number: 20160109848
    Abstract: An image forming apparatus includes an apparatus main body and a board holding member. The apparatus main body includes an image forming part. The board holding member is attached to the apparatus main body and configured to have a surface to which a board is fixed. The apparatus main body includes an engaging part and a supporting part. The engaging part is configured to engage with a side edge part of the board holding member. The supporting part is configured to support a part closer to an inside than the side edge part of the board holding member. The board holding member is rotated around the side edge part as a fulcrum so as to be opened and closed with respect to the apparatus main body.
    Type: Application
    Filed: October 15, 2015
    Publication date: April 21, 2016
    Applicant: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventors: Shinobu OHATA, Keiji OKUMURA
  • Publication number: 20160098006
    Abstract: An image forming apparatus includes a unit, a high-voltage board and a connecting mechanism. The connecting mechanism includes a first connecting member, a first holding member, a coupling member and a second connecting member. The first connecting member includes a first spring terminal. The first spring terminal includes a first large diameter part and a first small diameter part. The first holding member has a first contact part coming into contact with an end part of the first small diameter part at a side of the first large diameter part in a state where the first holding member is coupled with the coupling member. The coupling member has a second contact part coming into contact with an end part of the first large diameter part at a side of the first small diameter part in the state where the first holding member is coupled with the coupling member.
    Type: Application
    Filed: October 7, 2015
    Publication date: April 7, 2016
    Applicant: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventors: Shinobu OHATA, Keiji OKUMURA
  • Patent number: 9245956
    Abstract: An electronic circuit includes a bipolar device, a unipolar device connected in parallel to the bipolar device, and an output line connected to the bipolar device and to the unipolar device. An inductance between the unipolar device and the output line is smaller than an inductance between the bipolar device and the output line.
    Type: Grant
    Filed: May 27, 2011
    Date of Patent: January 26, 2016
    Assignee: ROHM CO., LTD.
    Inventor: Keiji Okumura
  • Patent number: 9207620
    Abstract: An image forming system includes an image forming apparatus, a post-processing apparatus, a fixed member, a first connector, a connecting member, and a second connector. The mage forming apparatus includes the fixed member on which the first connector is mounted and the post-processing apparatus includes connecting member on which the second connector is mounted. The connecting member is movable in a front-back direction and configured so as to be displaced between an engaging position in which the connecting member is engaged with the fixed member and a disengaging position in which the connecting member is disengaged from the fixed member. The first connector and the second connector are disconnected from each other when the connecting member is set to the disengaging position, and connected to each other when the connecting member is set to the engaging position.
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: December 8, 2015
    Assignee: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventors: Keiji Okumura, Terumitsu Noso
  • Patent number: 9142542
    Abstract: A semiconductor device (1) includes an n type epitaxial layer (8), body regions (12) formed in the surface layer part of the n type epitaxial layer (8), n type source regions (16) formed in the surface layer parts of the body regions (12), a gate insulating film (19) formed on the n type epitaxial layer (8), and a gate protection diode (30) and gate electrodes (20) formed on the gate insulating film (19). The gate protection diode (30) includes a first p type region (31), an n type region (32), and a second p type region (33). A first diode (30A) is formed of the first p type region (31) and the n type region (32). A second diode (30B) is formed of the n type region (32) and the second p type region (33). The first p type region (31) is connected to the gate electrode (20). The second p type region (33) is connected to a source electrode (27).
    Type: Grant
    Filed: September 13, 2011
    Date of Patent: September 22, 2015
    Assignee: ROHM CO., LTD.
    Inventor: Keiji Okumura
  • Patent number: 9136378
    Abstract: A semiconductor device includes a first conductive-type semiconductor layer, a second conductive-type body region formed in a surficial portion of the semiconductor layer, a first conductive-type source region formed in a surficial portion of the body region, a gate insulating film provided on the semiconductor layer and containing nitrogen atoms, the gate insulating film including a first portion in contact with the semiconductor layer outside the body region, a second portion in contact with the body region, and a third portion in contact with the source region, and a gate electrode provided on the gate insulating film in an area extending across the semiconductor layer outside the body region, the body region, and the source region. The third portion of the gate insulating film has a thickness greater than the thickness of the first portion and the thickness of the second portion.
    Type: Grant
    Filed: September 15, 2011
    Date of Patent: September 15, 2015
    Assignee: ROHM CO., LTD.
    Inventors: Keiji Okumura, Mineo Miura, Katsuhisa Nagao, Shuhei Mitani
  • Patent number: 9099331
    Abstract: Provided is a semiconductor device which includes a bonding wire, one end of which is connected to a bipolar device, the other end of which is connected to a conductive member, and the center of which is connected to a unipolar device, said semiconductor device being capable of improving the reliability of wire bonding. A package (4) includes a die pad (61), a source lead (63), a first MOSFET (11), and a first Schottky barrier diode (21). A source electrode (11S) of the first MOSFET (11), an anode electrode (21A) of the first Schottky barrier diode (21), and the source lead (63) are electrically connected by the bonding wire (31), one end of which is bonded to the source electrode (11S) of the first MOSFET (11), the other end of which is bonded to the source lead (63), and the center of which is bonded to the anode electrode (21A) of the first Schottky barrier diode (21).
    Type: Grant
    Filed: December 30, 2014
    Date of Patent: August 4, 2015
    Assignee: ROHM CO., LTD.
    Inventor: Keiji Okumura
  • Publication number: 20150138732
    Abstract: A semiconductor device includes: a first output unit configured to output a first phase; a second output unit configured to output a second phase different from the first phase, the second output unit being disposed to be stacked on the first output unit; and a controller configured to control the output units.
    Type: Application
    Filed: January 28, 2015
    Publication date: May 21, 2015
    Inventors: Keiji Okumura, Takukazu Otsuka, Masao Saito