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).

  • Publication number: 20160093413
    Abstract: The electroconductive composition of the present invention contains an electroconductive polymer (A) having a sulfonic acid group and/or carboxylic acid group, and a basic compound (B) having two or more nitrogen atoms. The electrical conductor of the present invention consists of the electroconductive composition. In the laminate of the present invention, the electrical conductor is laminated on at least one surface of a substrate. The method for producing a laminate of the present invention includes applying the electroconductive composition to at least one surface of a substrate, heating and drying the composition, and forming an electrical conductor. The electroconductive film of the present invention is provided with the electrical conductor.
    Type: Application
    Filed: May 16, 2014
    Publication date: March 31, 2016
    Applicant: Mitsubishi Rayon Co., Ltd.
    Inventors: Masashi UZAWA, Akira YAMAZAKI, Hiroya FUKUDA
  • Publication number: 20160094140
    Abstract: A matrix convertor includes a power convertor and a controller. The power convertor includes a plurality of bidirectional switches disposed between a plurality of input phases and a plurality of output phases. The controller is configured to generate a control command and control the power convertor based on the control command. The control command includes a switching pattern that causes a first input phase among the input phases to be connected to one output phase among the output phases and that causes connection of the input phases to be switched between a rest of the output phases. In generating the control command, the controller is configured to set a lower limit to a period of time during which a second input phase among the input phases that corresponds to an intermediate voltage is connected to the rest of the output phases.
    Type: Application
    Filed: September 24, 2015
    Publication date: March 31, 2016
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventor: Akira YAMAZAKI
  • Publication number: 20160094139
    Abstract: A matrix convertor includes a power convertor, a commutation controller, an error compensator, and a compensation amount adjustor. The power convertor is disposed between input phases and output phases. The power convertor includes a plurality of bidirectional switches each including a plurality of switching elements. The commutation controller is configured to perform commutation control with respect to the plurality of switching elements of each of the plurality of bidirectional switches using a commutation pattern including a plurality of steps so as to switch connection between the input phases and the output phases through the power convertor. The error compensator is configured to calculate a compensation amount to decrease an error in an output voltage caused by the commutation control. The compensation amount adjustor is configured to decrease the compensation amount based on at least one voltage among voltages of the output phases.
    Type: Application
    Filed: September 24, 2015
    Publication date: March 31, 2016
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Akira YAMAZAKI, Joji EBISU
  • Patent number: 9300470
    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: March 27, 2015
    Date of Patent: March 29, 2016
    Assignee: Renesas Electronics Corporation
    Inventors: Daisuke Oshida, Shigeru Furuta, Masayuki Hirokawa, Akira Yamazaki, Takashi Fujimori, Shigemasa Shiota
  • Publication number: 20160078978
    Abstract: A conductive composition according to the present invention contains a conductive polymer (A) having a sulfonic acid group and/or a carboxyl group; and an alkali metal hydroxide and/or an alkaline earth metal hydroxide (B). In such a conductive composition, the amount of the hydroxide (B) is set at 0.2˜0.65 mol per 1 mol of a repeating unit that contains a sulfonic acid group and/or a carboxyl group in the conductive polymer (A).
    Type: Application
    Filed: November 16, 2015
    Publication date: March 17, 2016
    Applicant: MITSUBISHI RAYON CO., LTD.
    Inventors: Kohei YAMADA, Takahiro Sakai, Masashi Uzawa, Youko Sasata, Akira Yamazaki
  • Patent number: 9276486
    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: Grant
    Filed: November 13, 2014
    Date of Patent: March 1, 2016
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Akira Yamazaki, Joji Ebisu
  • Publication number: 20160036364
    Abstract: A motor control device is provided, which includes a power converter for applying output voltage according to a voltage command to an electric motor, a magnetic flux estimator for estimating a vector of stator magnetic flux of the electric motor based on a difference between the output voltage and a voltage drop caused by a coil resistance of the electric motor, and a phase estimator for estimating a phase of the stator magnetic flux based on the vector of the stator magnetic flux estimated by the magnetic flux estimator. The magnetic flux estimator includes a variable low-pass filter for applying a low-pass filter to the difference at a cut-off frequency according to a frequency of the output voltage, and a phase adjuster for retarding at least one of an output phase of the variable low-pass filter and a phase of the difference before inputted into the variable low-pass filter.
    Type: Application
    Filed: July 28, 2015
    Publication date: February 4, 2016
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Akira YAMAZAKI, Shingo FUKUMARU
  • Patent number: 9245153
    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 3, 2014
    Date of Patent: January 26, 2016
    Assignee: Renesas Electronics Corporation
    Inventors: Daisuke Oshida, Masayuki Hirokawa, Akira Yamazaki, Takashi Fujimori, Shigemasa Shiota, Shigeru Furuta
  • Patent number: 9197775
    Abstract: An image reading device includes: a placement stage on which document sheets bearing respective images are placed; a pair of guide members that hold the document sheets placed on the placement stage between them and guide a document sheet when it is conveyed, at least one of the pair of guide members being movable in a width direction that is perpendicular to a conveying direction of the document sheets placed on the placement stage; an interval-between-guide-members detecting unit that detects an interval between the pair of guide members; a document sheet conveying unit that conveys the document sheets placed on the placement stage sequentially one by one and thereby causes the document sheets to pass a reading position; a document reading unit as defined herein; a first inclination correction unit as defined herein; and a correction mode switching control unit as defined herein.
    Type: Grant
    Filed: September 26, 2014
    Date of Patent: November 24, 2015
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Kazuyuki Koda, Akira Yamazaki, Tsuyoshi Mabara
  • Patent number: 9188066
    Abstract: A speed reduction method for a hand-carried engine-driven working machine is provided in which a speed reduction of an engine can be attained reliably and safely by preventing the occurrence of lean come-down phenomenon in such a state that the engine is operating in a practical revolution speed range. An acceleration is calculated based on a change in revolution speed, and when the acceleration becomes smaller than a predetermined threshold, an ignition timing is retarded by a desired amount based on a determination that the engine is being decelerated, and further, a fuel flow rate is also increased, whereby the decelerated state of the engine is maintained without fail, so that the occurrence of lean come-down phenomenon is prevented in the process of reducing the revolution speed of the engine.
    Type: Grant
    Filed: January 18, 2013
    Date of Patent: November 17, 2015
    Assignees: IIDA DENKI KOGYO CO., LTD., ZAMA JAPAN CO., LTD.
    Inventors: Ryouhei Yamashita, Akira Yamazaki, Tamotsu Saitou, Hideki Watanabe, Takumi Nonaka
  • Patent number: 9178458
    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: Grant
    Filed: October 3, 2013
    Date of Patent: November 3, 2015
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Akira Yamazaki, Hideaki Iura
  • Patent number: 9154065
    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: Grant
    Filed: January 16, 2014
    Date of Patent: October 6, 2015
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Akira Yamazaki, Hirofumi Kinomura, Hideaki Iura
  • Publication number: 20150279502
    Abstract: Provided are: a conductive composition containing a conductive polymer (A) satisfying the below-mentioned condition (i), and a compound (B) having at least 3 hydroxyl groups, and having a pH at 25° C. of a 1 mol/L aqueous solution of no greater than 9.0; a conductive composition that further contains a water-soluble polymer (C) having a hydroxyl group; and a solid electrolytic capacitor having a solid electrolytic layer containing the composition. Condition (i): the volume-average particle size of the smallest particle distribution containing the smallest peak exhibited by the particle size among at least one peak obtained by measuring the particle distribution by means of a dynamic light scattering method using a conductive polymer solution containing 1% by mass of the conductive polymer being less than 26 nm.
    Type: Application
    Filed: October 8, 2013
    Publication date: October 1, 2015
    Applicant: MITSUBISHI RAYON CO., LTD.
    Inventors: Akira Yamazaki, Takahiro Sakai, Kohei Yamada
  • Publication number: 20150249763
    Abstract: An image reading device includes: a supplying tray on which a document is placed; a document conveyer that successively conveys the document placed on the supplying tray toward a reading position; a plurality of detection sensors that are disposed in a plurality of positions in a width direction intersecting a conveyance direction of the document, and detect a front edge of the document in the conveyance direction when the document is placed on the supplying tray; and a document reading portion that reads an image on the document passing the reading position, and generates an image signal.
    Type: Application
    Filed: October 3, 2014
    Publication date: September 3, 2015
    Inventors: Tsuyoshi MABARA, Keisuke UCHIYAMA, Akira YAMAZAKI, Kazuyuki KODA
  • Patent number: 9115670
    Abstract: The opening of a solenoid valve is automatically adjusted after an engine is started and before actual work is performed for an appropriate air-fuel ratio, whereby it is possible to attain a good and stable driving of the engine without any delay even for an abrupt change in load. After the engine is started, when a rotation speed enters a “fuel flow rate adjusting rotation speed range” in which a definite load is applied to the engine in a working rotation speed range of the engine in which a throttle valve is opened to a definite opening, a detected rotation speed is fed back to a target rotation speed, and the opening of the solenoid valve is controlled to adjust a fuel flow rate, so that the combustion state in the engine is optimized at the valve opening so determined.
    Type: Grant
    Filed: March 28, 2013
    Date of Patent: August 25, 2015
    Assignees: IIDA DENKI KOGYO CO., LTD., ZAMA JAPAN CO., LTD.
    Inventors: Ryouhei Yamashita, Akira Yamazaki, Tamotsu Saitou, Hideki Watanabe, Takumi Nonaka
  • Publication number: 20150207941
    Abstract: An image reading device includes: a placement stage on which document sheets bearing respective images are placed; a pair of guide members that hold the document sheets placed on the placement stage between them and guide a document sheet when it is conveyed, at least one of the pair of guide members being movable in a width direction that is perpendicular to a conveying direction of the document sheets placed on the placement stage; an interval-between-guide-members detecting unit that detects an interval between the pair of guide members; a document sheet conveying unit that conveys the document sheets placed on the placement stage sequentially one by one and thereby causes the document sheets to pass a reading position; a document reading unit as defined herein; a first inclination correction unit as defined herein; and a correction mode switching control unit as defined herein.
    Type: Application
    Filed: September 26, 2014
    Publication date: July 23, 2015
    Inventors: Kazuyuki KODA, Akira YAMAZAKI, Tsuyoshi MABARA
  • Publication number: 20150207629
    Abstract: A semiconductor device in related art has a problem that security at the time of writing data cannot be sufficiently assured. A semiconductor device of the present invention 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: Application
    Filed: March 27, 2015
    Publication date: July 23, 2015
    Inventors: Daisuke OSHIDA, Shigeru FURUTA, Masayuki HIROKAWA, Akira YAMAZAKI, Takashi FUJIMORI, Shigemasa SHIOTA
  • 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