Patents by Inventor Chihiro Kawahara

Chihiro Kawahara 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: 11808801
    Abstract: A direct-current power supply applies a DC voltage to test semiconductor devices. A current detection unit detects a leakage current of a test circuit in which test semiconductor devices are included. A measuring instrument records a pulse waveform of the leakage current. An analyzer analyzes reliability of test semiconductor devices included in the test circuit based on the recorded pulse waveform.
    Type: Grant
    Filed: April 19, 2019
    Date of Patent: November 7, 2023
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Chihiro Kawahara, Yukihiko Wada
  • Patent number: 11750090
    Abstract: A semiconductor device includes a substrate having a first surface, a first electrode, a second electrode and a third electrode formed on the first surface, a first semiconductor element and a second semiconductor element disposed in the interior of the substrate, a first wiring group electrically connecting the first electrode to the first semiconductor element, and a fourth wiring group electrically connecting the second semiconductor element to the second electrode. The first wiring group includes a first connection part disposed in the interior of the substrate. The fourth wiring group includes a second connection part disposed in the interior of the substrate. When a voltage is applied between the first electrode and the third electrode to cause current to flow through the second electrode, a direction of current flowing through first connection part is opposite to a direction of current flowing through the second connection part.
    Type: Grant
    Filed: February 1, 2019
    Date of Patent: September 5, 2023
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Chihiro Kawahara, Shinya Yano
  • Publication number: 20230053137
    Abstract: The present invention concerns a device and a method for sensing an over-temperature of a power semiconductor. The invention: provides a current pulse source through control electrodes of the power semiconductor, duplicates the current provided by the current pulse source and provides the duplicated current to an emulating device, compares the voltage across the control electrodes to the voltage across the emulating device, notifies the result of the comparison.
    Type: Application
    Filed: December 17, 2020
    Publication date: February 16, 2023
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Chihiro KAWAHARA, Julio BRANDELERO, Stefan MOLLOV
  • Patent number: 11346879
    Abstract: An increased accuracy in detecting deterioration of a semiconductor device can be achieved. A first metal pattern and a second metal pattern are connected to a controller. A bonding wire connects the first metal pattern and an emitter electrode. A linear conductor is connected between a first electrode pad and a second electrode pad. First bonding wires connect the first electrode pad and the second metal pattern. Second bonding wires connect the second electrode pad and the second metal pattern. The controller detects the deterioration of the semiconductor device when a potential difference between the first metal pattern and the second metal pattern is above a threshold.
    Type: Grant
    Filed: January 4, 2018
    Date of Patent: May 31, 2022
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Chihiro Kawahara, Takeshi Horiguchi, Yoshiko Tamada, Yasushi Nakayama
  • Publication number: 20220077771
    Abstract: A semiconductor device includes a substrate having a first surface, a first electrode, a second electrode and a third electrode formed on the first surface, a first semiconductor element and a second semiconductor element disposed in the interior of the substrate, a first wiring group electrically connecting the first electrode to the first semiconductor element, and a fourth wiring group electrically connecting the second semiconductor element to the second electrode. The first wiring group includes a first connection part disposed in the interior of the substrate. The fourth wiring group includes a second connection part disposed in the interior of the substrate. When a voltage is applied between the first electrode and the third electrode to cause current to flow through the second electrode, a direction of current flowing through first connection part is opposite to a direction of current flowing through the second connection part.
    Type: Application
    Filed: February 1, 2019
    Publication date: March 10, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Chihiro KAWAHARA, Shinya YANO
  • Publication number: 20210116493
    Abstract: A direct-current power supply applies a DC voltage to test semiconductor devices. A current detection unit detects a leakage current of a test circuit in which test semiconductor devices are included. A measuring instrument records a pulse waveform of the leakage current. An analyzer analyzes reliability of test semiconductor devices included in the test circuit based on the recorded pulse waveform.
    Type: Application
    Filed: April 19, 2019
    Publication date: April 22, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventors: Chihiro KAWAHARA, Yukihiko WADA
  • Publication number: 20200116780
    Abstract: An increased accuracy in detecting deterioration of a semiconductor device can be achieved. A first metal pattern and a second metal pattern are connected to a controller. A bonding wire connects the first metal pattern and an emitter electrode. A linear conductor is connected between a first electrode pad and a second electrode pad. First bonding wires connect the first electrode pad and the second metal pattern. Second bonding wires connect the second electrode pad and the second metal pattern. The controller detects the deterioration of the semiconductor device when a potential difference between the first metal pattern and the second metal pattern is above a threshold.
    Type: Application
    Filed: January 4, 2018
    Publication date: April 16, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Chihiro KAWAHARA, Takeshi HORIGUCHI, Yoshiko TAMADA, Yasushi NAKAYAMA
  • Patent number: 7707306
    Abstract: One routing device which connects plural networks on which a plurality of other routing devices, including a parent router, are connected. The parent router manages network identification data to identify the plural networks. Master router data is included for each corresponding other routing device. Master router data includes master router identification data identifying whether the corresponding other routing device is a “master router” located on a path to the parent router or a “slave router” which is a routing device other than the master router, and includes network identification data identifying a network to which the corresponding other routing device connects. Upon startup of the one routing device, the master router data is acquired from the other routing devices on the networks to which the one routing device connects. It is determined whether a router function of the one routing device is enabled based on the acquired master router data.
    Type: Grant
    Filed: January 15, 2003
    Date of Patent: April 27, 2010
    Assignee: Panasonic Corporation
    Inventors: Reiko Ueno, Yasuyuki Shintani, Chihiro Kawahara, Seizo Tsuji
  • Publication number: 20050102384
    Abstract: One routing device connects plural networks on which a plurality of the other routing devices including a parent router are connected. The parent router manages network identification data to identify the plural networks. Master router data is included for each corresponding other routing device, respectively. Each master router data includes master router identification data identifying whether the corresponding other routing device is a “master router” which is located on a path to the parent router or a “slave router” which is a routing device other than the master router, and network identification data identifying a network to which the corresponding other routing device connects. Upon startup of the one routing device, the master router data is acquired from the other routing devices on the networks to which the one routing device connects. It is determined whether a router function of the one routing device is enabled based on the acquired master router data.
    Type: Application
    Filed: January 15, 2003
    Publication date: May 12, 2005
    Inventors: Reiko Ueno, Yasuyuki Shintani, Chihiro Kawahara, Seizo Tsuji
  • Patent number: 6614457
    Abstract: A focus control device that positions a focus on one of a plurality of graphical user interface (GUI) components displayed on a screen includes request receiving means for receiving a request to move the focus, focus permission information storing means for storing focus permission information indicating, for each GUI component, whether the focus can be positioned on the GUI component, and focus moving means for moving the focus in response to the received request to a GUI component where, according to the focus permission information, the focus can be positioned, the focus moving means skipping over GUI components where the focus cannot be positioned.
    Type: Grant
    Filed: October 26, 1999
    Date of Patent: September 2, 2003
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Norio Sanada, Chihiro Kawahara, Kiyokazu Yamanaka, Hisayuki Kino
  • Patent number: 6469719
    Abstract: A layout unit refers to a plurality of menu items stored in a menu item information storage unit by a menu item information obtaining unit. The following processes are performed as necessary to display a large number of menu items in a predetermined part of a GUI screen. A character size reducing unit reduces the size of characters used to display menu items. A margin reducing unit determines the layout of menu items so as to reduce the margins in menu items. An abbreviating unit replaces certain character strings in menu items with shorter character strings. In this way, the layout unit determines the layout of menu items. A menu control unit then has the menu items displayed in accordance with the layout determined by the layout unit.
    Type: Grant
    Filed: October 15, 1999
    Date of Patent: October 22, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hisayuki Kino, Norio Sanada, Kiyokazu Yamanaka, Chihiro Kawahara
  • Patent number: 5983247
    Abstract: A data conversion apparatus is provided for reading a document for a display screen and generating a display image for another display screen which has a different aspect ratio from the former display screen, where the document is composed of control statements written along with character strings or image information. The data conversion apparatus obtains the document from an external unit and converts the character strings and the image information in the document into display image elements based on conversion information. The data conversion apparatus judges whether a storage includes a blank for storing the display image elements at an appropriate position based on the conversion information.
    Type: Grant
    Filed: May 29, 1997
    Date of Patent: November 9, 1999
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kiyokazu Yamanaka, Kazuo Okamura, Junichi Hirai, Hidekazu Tanigawa, Chihiro Kawahara
  • Patent number: 5930808
    Abstract: A data conversion apparatus is provided as a data transmitting apparatus in a data communication system which achieves pseudo interactive communications by using one-way communications between the data transmitting apparatus and a plurality of data receiving apparatuses. The data conversion apparatus converts documents stored inside into images to be displayed on the screen, such as a TV screen. In doing so, if the document includes character strings or image information as link destination information which specifies another document as a link destination, the data conversion apparatus adds a supplementary design into the image of the link destination information for the viewer to recognize such information.
    Type: Grant
    Filed: May 29, 1997
    Date of Patent: July 27, 1999
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kiyokazu Yamanaka, Kazuo Okamura, Junichi Hirai, Hidekaau Tanigawa, Chihiro Kawahara
  • Patent number: 5767845
    Abstract: A CD-ROM 201 for recording multi-media information of at least one page stream. Contents of each page stream are successively recorded in the storage areas in the CD-ROM 201. The following three items are shown by the page stream: a partial image list having at least one pair of partial image data which describes partial images of one screen image and display state information including X-Y coordinates, X-Y enlargement rates and a rotational angle showing the display state; control information which describes command to be executed corresponding to an input signal; time line information which describes parameters concerning time sequence processing to be executed corresponding to the control information. The display data creation unit 213 synthesizes partial images shown by the partial image list and creates display data from the partial image data and display state information in the page stream read from the CD-ROM 201, and writes the display data in the display data storage unit 209.
    Type: Grant
    Filed: August 8, 1995
    Date of Patent: June 16, 1998
    Assignee: Matsushita Electric Industrial Co.
    Inventors: Masahiro Oashi, Yuki Kusumi, Masahiro Kawai, Chihiro Kawahara, Ryoichi Sasaki
  • Patent number: RE39652
    Abstract: A CD-ROM 201 for recording multi-media information of at least one page stream. Contents of each page stream are successively recorded in the storage areas in the CD-ROM 201. The following three items are shown by the page stream: a partial image list having at least one pair of partial image data which describes partial images of one screen image and display state information including X-Y coordinates, X-Y enlargement rates and a rotational angle showing the display state; control information which describes command to be executed corresponding to an input signal; time line information which describes parameters concerning time sequence processing to be executed corresponding to the control information. The display data creation unit 213 synthesizes partial images shown by the partial image list and creates display data from the partial image data and display state information in the page stream read from the CD-ROM 201, and writes the display data in the display data storage unit 209.
    Type: Grant
    Filed: June 2, 2000
    Date of Patent: May 22, 2007
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Masahiro Oashi, Yuki Kusumi, Masahiro Kawai, Chihiro Kawahara, Ryoichi Sasaki