Patents by Inventor Akira Yamazaki

Akira Yamazaki 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: 9087816
    Abstract: To achieve a reduction in cost of a semiconductor device, in a common board (a wiring board), a plurality of bonding leads each extend toward the center of the board, and a solder resist film as a die bonding region supporting a minimum chip is coated with a die bonding material. With this, even when a first semiconductor chip as a large chip is mounted, wire bonding can be performed without causing the die bonding material to cover the bonding leads. Thus, development cost can be reduced to reduce the cost of the semiconductor device (LGA).
    Type: Grant
    Filed: February 26, 2014
    Date of Patent: July 21, 2015
    Assignee: Renesas Electronics Corporation
    Inventors: Soshi Kuroda, Kenya Hironaga, Hironori Matsushima, Masatoshi Yasunaga, Akira Yamazaki
  • Patent number: 9062621
    Abstract: A method for making an optimum combustion during engine operating time changes a fuel flow rate of the solenoid valve on the basis of engine rotational speed feedback control during engine idling time at low engine rotational speed and low electric power consumption. During engine idling time of an engine are carried out a rotational speed detecting process, an idle rotation adjusting process of making a rotational speed detected by the rotational speed detecting process equal to an initial value of rotational speed by controlling an ignition timing while comparing the detected rotational speed with the initial value of rotational speed as target value, and a valve opening correction process according to idle ignition timing change (I.I.T.C.) obtained by the idle rotation adjusting process. The valve opening is set to an adjusted valve opening (A.V.O.) plus a correction valve opening (C.V.O.) by the valve opening correction process.
    Type: Grant
    Filed: October 26, 2012
    Date of Patent: June 23, 2015
    Assignees: IIDA DENKI KOGYO CO., LTD., ZAMA JAPAN CO., LTD.
    Inventors: Ryouhei Yamashita, Akira Yamazaki, Tamotsu Saitou, Hideki Watanabe, Takumi Nonaka
  • Publication number: 20150156021
    Abstract: Provided is a cryptographic communication system including a first semiconductor device and a second semiconductor device. The first semiconductor device includes a common key generation unit that generates a common key CK(a) by using a unique code UC(a) and correction data CD(a), and an encryption unit that encrypts the common key CK(a) generated in the common key generation unit by using a public key PK(b) of the second semiconductor device. The second semiconductor device includes a secret key generation unit that generates a secret key SK(b) by using a unique code UC(b) and correction data CD(b), and a decryption unit that decrypts the common key CK(a) encrypted in the encryption unit by using the secret key SK(b).
    Type: Application
    Filed: February 4, 2015
    Publication date: June 4, 2015
    Inventors: Shigemasa Shiota, Shigeru Furuta, Masayuki Hirokawa, Akira Yamazaki, Daisuke Oshida
  • Patent number: 9041325
    Abstract: A control device for an alternating current motor according to embodiments includes a current distributor and a phase estimator. The current distributor divides a torque command by using a control phase and outputs a component that contributes to a mechanical output of the motor as a ?-axis current command and a component that does not contribute to the mechanical output as a ?-axis current command. The phase estimator computes a phase at which a ?-axis component of an addition amount of the output of the current controller and a voltage drop amount of inductance of the motor becomes zero and outputs the computed phase as the control phase.
    Type: Grant
    Filed: February 29, 2012
    Date of Patent: May 26, 2015
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Akira Yamazaki, Kozo Ide
  • Publication number: 20150130431
    Abstract: A matrix converter includes a power converter, a command generator, and a commutation controller. The power converter includes bidirectional switches each having a conducting direction controllable by switching elements. The bidirectional switches are disposed between input terminals coupled to phases of an AC power source and output terminals coupled to phases of a load. The command generator generates a control command based on a voltage command specifying a pulse width of pulse width modulation control. The commutation controller controls the switching elements by a commutation method based on the control command so as to perform commutation control. The command generator includes a corrector to, when an error in an output voltage is caused by the commutation control, correct the pulse width specified in the voltage command in generating the control command to reduce the error in the output voltage.
    Type: Application
    Filed: November 13, 2014
    Publication date: May 14, 2015
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Akira YAMAZAKI, Joji EBISU
  • Publication number: 20150130432
    Abstract: A matrix converter includes a power converter, a control information generator, a commutation controller, a storage, and an error compensator. The power converter includes bidirectional switches each having a conducting direction controllable by switching elements. The bidirectional switches are disposed between input terminals and output terminals. The input terminals are respectively coupled to phases of an AC power source. The output terminals are respectively coupled to phases of a load. The control information generator generates control information to control the bidirectional switches. The commutation controller controls each of the switching elements based on the control information so as to perform commutation control. The storage stores setting information of at least one of a method of the commutation control and a modulation method of power conversion. The error compensator compensates for an output voltage error based on the setting information.
    Type: Application
    Filed: November 13, 2014
    Publication date: May 14, 2015
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Akira YAMAZAKI, Joji EBISU
  • Patent number: 9026882
    Abstract: A semiconductor device has: a unique code generating unit generating an initial unique code which is a value unique to a device and includes an error in a random bit; a first error correcting unit correcting an error in the initial unique code to generate an intermediate unique code; a second error correcting unit correcting an error in the intermediate unique code to generate a first determinate unique code; and a decrypting unit decrypting, with the first determinate unique code, transmission data obtained by encrypting confidential information with key information generated on the basis of the intermediate unique code by an external device to generate confidential information.
    Type: Grant
    Filed: June 15, 2012
    Date of Patent: May 5, 2015
    Assignee: Renesas Electronics Corporation
    Inventors: Daisuke Oshida, Shigeru Furuta, Masayuki Hirokawa, Akira Yamazaki, Takashi Fujimori, Shigemasa Shiota
  • Publication number: 20150115906
    Abstract: A matrix converter includes: a power converter configured to couple an AC power supply and a load together; and a controller configured to selectively execute: a first control mode in which the controller is configured to perform power conversion between the AC power supply and the load; and a second control mode in which the controller is configured to directly combine the AC power supply with the load. The controller is configured to: increase the output voltage and cause a phase of the output voltage follow up a voltage phase of the AC power supply in a case where a difference between a frequency of an output voltage from the power converter to the load and a frequency of the AC power supply becomes within a predetermined range.
    Type: Application
    Filed: October 15, 2014
    Publication date: April 30, 2015
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Joji EBISU, Akira YAMAZAKI
  • Patent number: 8988027
    Abstract: A motor control apparatus according to the embodiment includes a rotational position estimating unit, a change amount estimating unit, and an inductance estimating unit. The rotational position estimating unit estimates a rotational position of a rotor from a motor parameter including a q-axis inductance of a motor on a basis of an output current to the motor and a voltage reference. The change amount estimating unit estimates a change amount of an output torque with respect to a current phase change of the motor corresponding to a high frequency signal whose frequency is higher than a drive frequency of the motor. The inductance estimating unit estimates an inductance value that obtains a maximum torque on a basis of the change amount as the q-axis inductance.
    Type: Grant
    Filed: March 11, 2013
    Date of Patent: March 24, 2015
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Shingo Fukumaru, Shinya Morimoto, Hideaki Iura, Akira Yamazaki
  • Patent number: 8965266
    Abstract: Automatic document feeder includes a transport path member having a transport path surface configuring a transport path in a device body, a latching member that is mounted on a rotating shaft provided in the other end side, is urged in a first rotation direction latched to a latched portion, and holds the transport path member in closed transport path, and an operating member that is rotated up to an operating position by own weight thereof or urging force in a second rotation direction when the device body moves to an exposed position of the transport path member, and is mounted with allowance so that the latching member is rotated in the second rotation direction according to a further rotating operation in the second rotation direction from the operating position and the latching member is detached from the latched portion.
    Type: Grant
    Filed: April 23, 2012
    Date of Patent: February 24, 2015
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Akira Yamazaki, Hyundeok Ha, Senggyu Cho
  • Publication number: 20140292237
    Abstract: A motor control apparatus according to an embodiment includes a power conversion unit and a control unit. The power conversion unit supplies power to a motor having salient pole characteristic. The control unit performs proportional-integral control on the deviation between a current reference and a current flowing into the motor to generate a voltage reference, and controls the power conversion unit on the basis of the voltage reference. The control unit estimates the magnetic-pole position of a rotor of the motor on the basis of a high-frequency current flowing into the motor by controlling the power conversion unit, and corrects the estimated magnetic-pole position on the basis of an integrated value of the proportional-integral control.
    Type: Application
    Filed: January 16, 2014
    Publication date: October 2, 2014
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Akira YAMAZAKI, Hirofumi KINOMURA, Hideaki IURA
  • Publication number: 20140289538
    Abstract: A semiconductor device in related art has a problem that security on confidential information stored is insufficient. A semiconductor device of the present invention has a unique code which is unique to a device and generates unique code corresponding information from the unique code. The semiconductor device has a memory region in which specific information obtained by encrypting confidential information is stored in a region associated with the unique code corresponding information. The specific information read from the memory region is encrypted with the unique code corresponding information to generate the confidential information.
    Type: Application
    Filed: June 3, 2014
    Publication date: September 25, 2014
    Applicant: Renesas Electronics Corporation
    Inventors: Daisuke OSHIDA, Masayuki HIROKAWA, Akira YAMAZAKI, Takashi FUJIMORI, Shigemasa SHIOTA, Shigeru FURUTA
  • Publication number: 20140198428
    Abstract: A solid electrolytic capacitor in which a solid electrolytic layer is formed by applying and drying a conductive-polymer solution which contains a conductive polymer that satisfies following condition (A) and which meets following condition (B) to a dielectric layer formed by oxidizing the surface of an anode metal. Condition (A): Out of one or more peaks that appear when particle size distributions are measured by a dynamic light-scattering method using a conductive-polymer solution containing 1 mass % conductive polymer, the volume average particle size in the distribution that includes the peak of the smallest particle size is smaller than 26 nm.
    Type: Application
    Filed: August 17, 2011
    Publication date: July 17, 2014
    Applicant: Mitsubishi Rayon Co., Ltd
    Inventors: Akira Yamazaki, Takeo Sando, Masashi Uzawa, Hiroaki Iriyama
  • Patent number: 8778613
    Abstract: A resin which is prepared by polymerizing a monomer component incorporating a hydrophilic spacer, and a ligand-immobilized solid phase carrier obtained by immobilizing a ligand to the resin, are capable of reducing the non-specific adsorption of substances, other than the target molecule for the ligand, which mingle in the sample, to the resin and/or the ligand. Therefore, target molecule search, identification and the like with less noise are enabled.
    Type: Grant
    Filed: October 15, 2004
    Date of Patent: July 15, 2014
    Assignee: Reverse Proteomics Research Institute Co., Ltd.
    Inventors: Akito Tanaka, Takaaki Shiyama, Akira Yamazaki
  • Patent number: 8782432
    Abstract: A semiconductor device in related art has a problem that security on confidential information stored is insufficient. A semiconductor device of the present invention has a unique code which is unique to a device and generates unique code corresponding information from the unique code. The semiconductor device has a memory region in which specific information obtained by encrypting confidential information is stored in a region associated with the unique code corresponding information. The specific information read from the memory region is encrypted with the unique code corresponding information to generate the confidential information.
    Type: Grant
    Filed: June 15, 2012
    Date of Patent: July 15, 2014
    Assignee: Renesas Electronics Corporation
    Inventors: Daisuke Oshida, Masayuki Hirokawa, Akira Yamazaki, Takashi Fujimori, Shigemasa Shiota, Shigeru Furuta
  • Patent number: 8773732
    Abstract: An image reading apparatus comprises a reading unit including a document table, a cover portion covering the document table, an opening and closing mechanism having a first and second mounting portions and opening and closing the cover portion to an opened and a closed state, a covering member rotating about a rotating shaft of a member side and covering at least a portion of an exposed portion, and a rotating regulating unit regulating rotation of the covering member due to the weight of the covering member in a state where the center of gravity of the covering member is separated further from the cover portion than the rotating shaft of the member side, and where the covering member covers at least a portion of the exposed portion within a movement range of the opening and the closing of the cover portion.
    Type: Grant
    Filed: April 20, 2012
    Date of Patent: July 8, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Akira Yamazaki, Ryusuke Nakata, Senggyu Cho, Munseok Yang
  • Publication number: 20140175678
    Abstract: To achieve a reduction in cost of a semiconductor device, in a common board (a wiring board), a plurality of bonding leads each extend toward the center of the board, and a solder resist film as a die bonding region supporting a minimum chip is coated with a die bonding material. With this, even when a first semiconductor chip as a large chip is mounted, wire bonding can be performed without causing the die bonding material to cover the bonding leads. Thus, development cost can be reduced to reduce the cost of the semiconductor device (LGA).
    Type: Application
    Filed: February 26, 2014
    Publication date: June 26, 2014
    Applicant: Renesas Electronics Corporation
    Inventors: Soshi Kuroda, Kenya Hironaga, Hironori Matsushima, Masatoshi Yasunaga, Akira Yamazaki
  • Publication number: 20140125261
    Abstract: A controller of an AC motor includes a d-axis voltage command section to generate a d-axis voltage command on a d axis of a d-q coordinate system. A d-axis non-interactive control section removes, from the d-axis voltage command, an interference component resulting from a current on a q axis of the system. A first current deviation arithmetic section obtains a deviation between a current command on the q axis and the current on the q axis flowing through the AC motor. A q-axis integral control section outputs an integral value of the deviation. A q-axis voltage command section generates a q-axis voltage command based on the deviation. A constant output control section outputs a correction voltage command based on the integral value. A d-axis voltage command correction section subtracts the correction voltage command from the d-axis voltage command after non-interactive control to correct the d-axis voltage command.
    Type: Application
    Filed: October 3, 2013
    Publication date: May 8, 2014
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Akira YAMAZAKI, Hideaki IURA
  • Patent number: 8692383
    Abstract: To achieve a reduction in cost of a semiconductor device, in a common board (a wiring board), a plurality of bonding leads each extend toward the center of the board, and a solder resist film as a die bonding region supporting a minimum chip is coated with a die bonding material. With this, even when a first semiconductor chip as a large chip is mounted, wire bonding can be performed without causing the die bonding material to cover the bonding leads. Thus, development cost can be reduced to reduce the cost of the semiconductor device (LGA).
    Type: Grant
    Filed: September 13, 2011
    Date of Patent: April 8, 2014
    Assignee: Renesas Electronics Coporation
    Inventors: Soshi Kuroda, Kenya Hironaga, Hironori Matsushima, Masatoshi Yasunaga, Akira Yamazaki
  • Patent number: 8678507
    Abstract: In an operating lever structure for a vehicle seat in which an opening through which a seat belt extends is provided adjacent to a seat cushion lifting and lowering mechanism and a fixed end portion of the seat belt is connected to a seat cushion frame, a lifter lever includes a plate-like extending portion that is coupled to the lifting and lowering mechanism and a protrusion portion. The plate-like extending portion extends toward a front of the seat. The protrusion portion extends from the front end of the plate-like extending portion toward the outside in the seat width direction. The protrusion portion protrudes from an outer shield through a first exposing port of the outer shield, installed to a side portion of the seat cushion.
    Type: Grant
    Filed: December 5, 2012
    Date of Patent: March 25, 2014
    Assignee: Toyota Boshoku Kabushiki Kaisha
    Inventors: Akira Yamazaki, Yoshitaka Tomonari