Patents by Inventor Atsuo HIRUKAWA

Atsuo HIRUKAWA 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: 20190164684
    Abstract: A multilayer coil component includes a multilayer body that is formed of laminated insulating layers and that contains a coil, and a first outer electrode and a second outer electrode that are electrically connected to the coil. The coil is formed of coil conductors. The first outer electrode covers a part of a first end surface of the multilayer body, extends from the first end surface, and covers a part of a first main surface thereof. The second outer electrode covers a part of a second end surface of the multilayer body, extends from the second end surface, and covers a part of the first main surface. A lamination direction of the multilayer body and an axial direction of the coil are parallel to a mounting surface. Determination marks are formed on surfaces of the multilayer body at locations at which the first and second outer electrodes are formed.
    Type: Application
    Filed: November 20, 2018
    Publication date: May 30, 2019
    Applicant: Murata Manufacturing Co., Ltd.
    Inventor: Atsuo Hirukawa
  • Patent number: 9871449
    Abstract: A two-phase DC/DC converter includes, as an inductor array, a pair of inductors to which a DC input voltage is alternately applied with a phase difference of about 180 degrees through switching control of switching devices. A duty ratio is substantially in a range from 5% to 40%, and a coupling factor between the inductors is substantially in a range from ?0.4 to ?0.1. With this configuration, ripple current in the inductors can be made to be smaller than in the case in which there is no coupling between the inductors even when the duty ratio considerably varies.
    Type: Grant
    Filed: May 28, 2015
    Date of Patent: January 16, 2018
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Atsuo Hirukawa, Ko Yamanaga
  • Publication number: 20170345551
    Abstract: A coil component including 2N coils, N being an integer of two or more, wherein the 2N coils are configured to form N pairs, and wherein when coils other than a first coil and a second coil forming one of the N pairs are defined as the other coils, a magnetic coupling between the first coil and the second coil is stronger than a magnetic coupling between the first coil and each of the other coils.
    Type: Application
    Filed: May 4, 2017
    Publication date: November 30, 2017
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Yoshimasa YOSHIOKA, Akinori HAMADA, Atsuo HIRUKAWA
  • Publication number: 20160254747
    Abstract: A two-phase DC/DC converter includes, as an inductor array, a pair of inductors to which a DC input voltage is alternately applied with a phase difference of about 180 degrees through switching control of switching devices. A duty ratio is substantially in a range from 5% to 40%, and a coupling factor between the inductors is substantially in a range from ?0.4 to ?0.1. With this configuration, ripple current in the inductors can be made to be smaller than in the case in which there is no coupling between the inductors even when the duty ratio considerably varies.
    Type: Application
    Filed: May 28, 2015
    Publication date: September 1, 2016
    Applicant: MURATA MANUFACTURING CO., LTD.
    Inventors: Atsuo HIRUKAWA, Ko YAMANAGA