Patents by Inventor Akio Nakagawa

Akio 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: 20140319576
    Abstract: In a non-punch-through (NPT) insulated gate bipolar transistor (IGBT), a rear surface structure including a p+ collector layer and a collector electrode is provided on a rear surface of an n? semiconductor substrate and a depletion layer which is spread from a pn junction between a p base region and an n? drift layer when the NPT-IGBT is turned off does not come into contact with the p+ collector layer. A carrier concentration of a region of the n? drift layer that is provided at a depth of 0.3 ?m or less from a pn junction between the n? drift layer and the p+ collector layer is in the range of 30% to 70% of a stored carrier concentration of a region of the n? drift layer that is provided at a depth greater than 0.3 ?m from the pn junction.
    Type: Application
    Filed: July 9, 2014
    Publication date: October 30, 2014
    Applicant: FUJI ELECTRIC CO., LTD.
    Inventors: Yusuke KOBAYASHI, Manabu Takei, Akio Nakagawa
  • Patent number: 8854033
    Abstract: A semiconductor device having a lateral semiconductor element includes a semiconductor substrate, a first electrode on the substrate, a second electrode on the substrate, and an isolation structure located in the substrate to divide the substrate into a first island and a second island electrically insulated from the first island. The lateral semiconductor element includes a main cell located in the first island and a sense cell located in the second island. The main cell causes a first current to flow between the first electrode and the second electrode so that the first current flows in a lateral direction along the surface of the substrate. The first current is detected by detecting a second current flowing though the sense cell.
    Type: Grant
    Filed: June 1, 2011
    Date of Patent: October 7, 2014
    Assignee: DENSO CORPORATION
    Inventors: Satoshi Shiraki, Norihito Tokura, Shigeki Takahashi, Masahiro Yamamoto, Akira Yamada, Hiroyasu Kudo, Youichi Ashida, Akio Nakagawa
  • Publication number: 20140240015
    Abstract: A semiconductor device includes: a voltage-control-type clock generation circuit having a plurality of stages of first delay elements and whose oscillation frequency is controlled according to a control voltage applied to the first delay elements; a delay circuit having a plurality of stages of second delay elements connected serially; and a selection circuit selecting one from pulse signals output by the plurality of stages of respective second delay elements. The first delay elements and the second delay elements have a same structure formed on a same semiconductor substrate, and a delay amount of the second delay elements is adjusted according to the control voltage.
    Type: Application
    Filed: May 7, 2014
    Publication date: August 28, 2014
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Kazutoshi NAKAMURA, Toru TAKAYAMA, Yuki KAMATA, Akio NAKAGAWA, Yoshinobu SANO, Toshiyuki NAKA
  • Publication number: 20140225234
    Abstract: A semiconductor device having a lateral diode includes a semiconductor layer, a first semiconductor region in the semiconductor layer, a contact region having an impurity concentration greater than that of the first semiconductor region, a second semiconductor region located in the semiconductor layer and separated from the contact region, a first electrode electrically connected through the contact region to the first semiconductor region, and a second electrode electrically connected to the second semiconductor region. The second semiconductor region includes a low impurity concentration portion, a high impurity concentration portion, and an extension portion. The second electrode forms an ohmic contact with the high impurity concentration portion. The extension portion has an impurity concentration greater than that of the low impurity concentration portion and extends in a thickness direction of the semiconductor layer.
    Type: Application
    Filed: April 22, 2014
    Publication date: August 14, 2014
    Applicant: DENSO CORPORATION
    Inventors: Takao YAMAMOTO, Norihito TOKURA, Hisato KATO, Akio NAKAGAWA
  • Patent number: 8791690
    Abstract: A semiconductor device having a lateral semiconductor element includes a semiconductor substrate, a first electrode on the substrate, a second electrode on the substrate, and an isolation structure located in the substrate to divide the substrate into a first island and a second island electrically insulated from the first island. The lateral semiconductor element includes a main cell located in the first island and a sense cell located in the second island. The main cell causes a first current to flow between the first electrode and the second electrode so that the first current flows in a lateral direction along the surface of the substrate. The first current is detected by detecting a second current flowing though the sense cell.
    Type: Grant
    Filed: June 1, 2011
    Date of Patent: July 29, 2014
    Assignee: DENSO CORPORATION
    Inventors: Satoshi Shiraki, Norihito Tokura, Shigeki Takahashi, Masahiro Yamamoto, Akira Yamada, Hiroyasu Kudo, Youichi Ashida, Akio Nakagawa
  • Patent number: 8760206
    Abstract: A semiconductor device includes: a voltage-control-type clock generation circuit having a plurality of stages of first delay elements and whose oscillation frequency is controlled according to a control voltage applied to the first delay elements; a delay circuit having a plurality of stages of second delay elements connected serially; and a selection circuit selecting one from pulse signals output by the plurality of stages of respective second delay elements. The first delay elements and the second delay elements have a same structure formed on a same semiconductor substrate, and a delay amount of the second delay elements is adjusted according to the control voltage.
    Type: Grant
    Filed: June 11, 2013
    Date of Patent: June 24, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kazutoshi Nakamura, Toru Takayama, Yuki Kamata, Akio Nakagawa, Yoshinobu Sano, Toshiyuki Naka
  • Patent number: 8742534
    Abstract: A semiconductor device having a lateral diode includes a semiconductor layer, a first semiconductor region in the semiconductor layer, a contact region having an impurity concentration greater than that of the first semiconductor region, a second semiconductor region located in the semiconductor layer and separated from the contact region, a first electrode electrically connected through the contact region to the first semiconductor region, and a second electrode electrically connected to the second semiconductor region. The second semiconductor region includes a low impurity concentration portion, a high impurity concentration portion, and an extension portion. The second electrode forms an ohmic contact with the high impurity concentration portion. The extension portion has an impurity concentration greater than that of the low impurity concentration portion and extends in a thickness direction of the semiconductor layer.
    Type: Grant
    Filed: August 3, 2011
    Date of Patent: June 3, 2014
    Assignee: DENSO CORPORATION
    Inventors: Takao Yamamoto, Norihito Tokura, Hisato Kato, Akio Nakagawa
  • Publication number: 20140132979
    Abstract: An information processing apparatus comprising: a reception unit adapted to receive a packet containing first data to be stored in a storage unit, a first address indicating an address of second data held in the storage unit, and a second address indicating an address at which the first data is to be written in the storage unit; an access unit adapted to read out the second data from the storage unit based on the first address, and write the first data in the storage unit based on the second address; and a transmission unit adapted to replace the first data of the packet received by the reception unit with the second data read out by the access unit, and transmit the packet.
    Type: Application
    Filed: January 16, 2014
    Publication date: May 15, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Akio Nakagawa, Hisashi Ishikawa
  • Patent number: 8707132
    Abstract: An information processing apparatus comprising: a reception unit adapted to receive a packet containing first data to be stored in a storage unit, a first address indicating an address of second data held in the storage unit, and a second address indicating an address at which the first data is to be written in the storage unit; an access unit adapted to read out the second data from the storage unit based on the first address, and write the first data in the storage unit based on the second address; and a transmission unit adapted to replace the first data of the packet received by the reception unit with the second data read out by the access unit, and transmit the packet.
    Type: Grant
    Filed: July 1, 2011
    Date of Patent: April 22, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Akio Nakagawa, Hisashi Ishikawa
  • Publication number: 20140070271
    Abstract: A lateral insulated gate bipolar transistor includes a semiconductor substrate including a drift layer, a collector region, a channel layer, an emitter region, a gate insulating layer, a gate electrode, a collector electrode, an emitter electrode, and a barrier layer. The barrier layer is disposed along either side of the collector region and is located to a depth deeper than a bottom of the channel layer. The barrier layer has an impurity concentration that is higher than an impurity concentration of the drift layer. The barrier layer has a first end close to the collector region and a second end far from the collector region. The first end is located between the channel layer and the collector region, and the second end is located on the bottom of the channel layer.
    Type: Application
    Filed: November 12, 2013
    Publication date: March 13, 2014
    Applicant: DENSO CORPORATION
    Inventors: Shigeki TAKAHASHI, Norihito TOKURA, Satoshi SHIRAKI, Youichi ASHIDA, Akio NAKAGAWA
  • Publication number: 20130270910
    Abstract: A semiconductor device includes: a voltage-control-type clock generation circuit having a plurality of stages of first delay elements and whose oscillation frequency is controlled according to a control voltage applied to the first delay elements; a delay circuit having a plurality of stages of second delay elements connected serially; and a selection circuit selecting one from pulse signals output by the plurality of stages of respective second delay elements. The first delay elements and the second delay elements have a same structure formed on a same semiconductor substrate, and a delay amount of the second delay elements is adjusted according to the control voltage.
    Type: Application
    Filed: June 11, 2013
    Publication date: October 17, 2013
    Inventors: Kazutoshi NAKAMURA, Toru TAKAYAMA, Yuki KAMATA, Akio NAKAGAWA, Yoshinobu SANO, Toshiyuki NAKA
  • Patent number: 8497720
    Abstract: A semiconductor device includes: a voltage-control-type clock generation circuit having a plurality of stages of first delay elements and whose oscillation frequency is controlled according to a control voltage applied to the first delay elements; a delay circuit having a plurality of stages of second delay elements connected serially; and a selection circuit selecting one from pulse signals output by the plurality of stages of respective second delay elements. The first delay elements and the second delay elements have a same structure formed on a same semiconductor substrate, and a delay amount of the second delay elements is adjusted according to the control voltage.
    Type: Grant
    Filed: June 20, 2012
    Date of Patent: July 30, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kazutoshi Nakamura, Toru Takayama, Yuki Kamata, Akio Nakagawa, Yoshinobu Sano, Toshiyuki Naka
  • Patent number: 8411988
    Abstract: An image processing apparatus partitions entered image data into first partitioned image data and appends margin data to the first partitioned image data. The image processing apparatus corrects the first partitioned image data other than the margin data to second partitioned image data and processes the second partitioned image data and the margin data.
    Type: Grant
    Filed: July 24, 2008
    Date of Patent: April 2, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Akio Nakagawa, Hisashi Ishikawa
  • Patent number: 8354691
    Abstract: A N-channel lateral insulated-gate bipolar transistor includes a semiconductor substrate, a drift layer, a collector region, a channel layer, an emitter region, a gate insulation film, a gate electrode, a collector electrode, an emitter electrode. The collector region includes a high impurity concentration region having a high impurity concentration and a low impurity concentration region having a lower impurity concentration than the high impurity concentration region. The collector electrode is in ohmic contact with the high impurity concentration region and in schottky contact with the low impurity concentration region.
    Type: Grant
    Filed: September 7, 2011
    Date of Patent: January 15, 2013
    Assignee: DENSO CORPORATION
    Inventors: Norihito Tokura, Shigeki Takahashi, Youichi Ashida, Akio Nakagawa
  • Publication number: 20120256607
    Abstract: A semiconductor device includes: a voltage-control-type clock generation circuit having a plurality of stages of first delay elements and whose oscillation frequency is controlled according to a control voltage applied to the first delay elements; a delay circuit having a plurality of stages of second delay elements connected serially; and a selection circuit selecting one from pulse signals output by the plurality of stages of respective second delay elements. The first delay elements and the second delay elements have a same structure formed on a same semiconductor substrate, and a delay amount of the second delay elements is adjusted according to the control voltage.
    Type: Application
    Filed: June 20, 2012
    Publication date: October 11, 2012
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Kazutoshi NAKAMURA, Toru TAKAYAMA, Yuki KAMATA, Akio NAKAGAWA, Yoshinobu SANO, Toshiyuki NAKA
  • Patent number: 8248128
    Abstract: A semiconductor device includes: a voltage-control-type clock generation circuit having a plurality of stages of first delay elements and whose oscillation frequency is controlled according to a control voltage applied to the first delay elements; a delay circuit having a plurality of stages of second delay elements connected serially; and a selection circuit selecting one from pulse signals output by the plurality of stages of respective second delay elements. The first delay elements and the second delay elements have a same structure formed on a same semiconductor substrate, and a delay amount of the second delay elements is adjusted according to the control voltage.
    Type: Grant
    Filed: May 19, 2011
    Date of Patent: August 21, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kazutoshi Nakamura, Toru Takayama, Yuki Kamata, Akio Nakagawa, Yoshinobu Sano, Toshiyuki Naka
  • Publication number: 20120119318
    Abstract: In a semiconductor device in which a first electrode and a second electrode are disposed on a surface of a first conductivity-type semiconductor layer of a semiconductor substrate and a lateral element is formed to cause an electric current between the first electrode and the second electrode, a scroll-shaped resistive field plate is disposed on the semiconductor layer across an insulation film. The resistive field plate extends toward the second electrode while surrounding a periphery of the first electrode in a scroll shape. A resistance value of a total resistance of the resistive field plate is in a range between 90 k? and 90 M?.
    Type: Application
    Filed: November 14, 2011
    Publication date: May 17, 2012
    Applicant: DENSO CORPORATION
    Inventors: Norihito TOKURA, Takao Yamamoto, Hisato Kato, Kouji Senda, Akio Nakagawa
  • Publication number: 20120061726
    Abstract: A N-channel lateral insulated-gate bipolar transistor includes a semiconductor substrate, a drift layer, a collector region, a channel layer, an emitter region, a gate insulation film, a gate electrode, a collector electrode, an emitter electrode. The collector region includes a high impurity concentration region having a high impurity concentration and a low impurity concentration region having a lower impurity concentration than the high impurity concentration region. The collector electrode is in ohmic contact with the high impurity concentration region and in schottky contact with the low impurity concentration region.
    Type: Application
    Filed: September 7, 2011
    Publication date: March 15, 2012
    Applicant: DENSO CORPORATION
    Inventors: Norihito TOKURA, Shigeki Takahashi, Youichi Ashida, Akio Nakagawa
  • Publication number: 20120047418
    Abstract: An information processing apparatus comprising: a reception unit adapted to receive a packet containing first data to be stored in a storage unit, a first address indicating an address of second data held in the storage unit, and a second address indicating an address at which the first data is to be written in the storage unit; an access unit adapted to read out the second data from the storage unit based on the first address, and write the first data in the storage unit based on the second address; and a transmission unit adapted to replace the first data of the packet received by the reception unit with the second data read out by the access unit, and transmit the packet.
    Type: Application
    Filed: July 1, 2011
    Publication date: February 23, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Akio Nakagawa, Hisashi Ishikawa
  • Publication number: 20120032313
    Abstract: A semiconductor device having a lateral diode includes a semiconductor layer, a first semiconductor region in the semiconductor layer, a contact region having an impurity concentration greater than that of the first semiconductor region, a second semiconductor region located in the semiconductor layer and separated from the contact region, a first electrode electrically connected through the contact region to the first semiconductor region, and a second electrode electrically connected to the second semiconductor region. The second semiconductor region includes a low impurity concentration portion, a high impurity concentration portion, and an extension portion. The second electrode forms an ohmic contact with the high impurity concentration portion. The extension portion has an impurity concentration greater than that of the low impurity concentration portion and extends in a thickness direction of the semiconductor layer.
    Type: Application
    Filed: August 3, 2011
    Publication date: February 9, 2012
    Applicant: DENSO CORPORATION
    Inventors: Takao YAMAMOTO, Norihito Tokura, Hisato Kato, Akio Nakagawa