Patents by Inventor Atsushi EZAWA

Atsushi EZAWA 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: 20200295676
    Abstract: In a vibration unit, a piezoelectric element enters an internal space of a through hole; and thereby, a second case member can be arranged proximate to a first case member. Therefore, a thickness of the vibration unit can be reduced, namely, a height of the vibration unit can be reduced. As described above, since the thickness of the vibration unit is reduced, a size of the vibration unit can be reduced.
    Type: Application
    Filed: September 13, 2018
    Publication date: September 17, 2020
    Applicant: TDK CORPORATION
    Inventors: Atsushi EZAWA, Takuto HORII, Atsuko MURAKOSHI
  • Publication number: 20200215573
    Abstract: In a vibration unit, a first electrode of a sensor circuit of a control unit is electrically connected to a first external electrode-of a first piezoelectric element, a second electrode of the sensor circuit is electrically connected to a second external electrode of the first piezoelectric element, a first electrode of a drive circuit is electrically connected to a first external electrode of a second piezoelectric element, and a second electrode of the drive circuit is electrically connected to a second external electrode of the second piezoelectric element. Only a relatively small voltage induced by an electromotive force occurring due to the flexure of the first piezoelectric element is applied to the sensor circuit. In addition, only a relatively large drive voltage to be applied to the second piezoelectric element is applied to the drive circuit.
    Type: Application
    Filed: September 13, 2018
    Publication date: July 9, 2020
    Applicant: TDK CORPORATION
    Inventors: Takuto HORII, Atsushi EZAWA
  • Patent number: 10514522
    Abstract: A lens drive unit that prevents an actuator from being inclined is provided. In the lens drive unit, when a lens frame is displaced in a direction orthogonal to a direction in which the actuator extends and contracts with respect to a base member by, for example, impact from an outside of the lens drive unit, a drive shaft of the actuator abuts on a first lateral wall and a column, so that the actuator is prevented from being inclined with respect to the base member.
    Type: Grant
    Filed: July 3, 2017
    Date of Patent: December 24, 2019
    Assignee: TDK CORPORATION
    Inventors: Masahiro Hosokawa, Naoki Yusa, Seiji Fukuoka, Mio Hamashima, Toshiki Maruyama, Hiroshi Tojo, Mitsunao Homma, Takuto Horii, Atsushi Ezawa, Tatsuya Taki
  • Patent number: 10429606
    Abstract: A lens drive unit that offers enhanced reliability in connection between an actuator electrode and an electric wire is provided. In the lens drive unit, an actuator has a weight housed in an holding portion of a base member and is thereby fixed in the base member. Electrodes on a lateral surface of the weight directly contact respective terminal electrodes on an inner lateral surface of the holding portion, so that an electrical connection is established therebetween. The arrangement enhances reliability in connection between the actuator electrodes and the terminal electrodes.
    Type: Grant
    Filed: July 5, 2017
    Date of Patent: October 1, 2019
    Assignee: TDK CORPORATION
    Inventors: Toshiki Maruyama, Naoki Yusa, Seiji Fukuoka, Masahiro Hosokawa, Mio Hamashima, Hiroshi Tojo, Mitsunao Homma, Takuto Horii, Atsushi Ezawa, Tatsuya Taki
  • Patent number: 10347816
    Abstract: The present invention relates to a piezoelectric driving device 10 capable of moving the movable member 14 along the axis direction engaged in a movable manner to the axial direction with respect to the shaft 16. A pair of the external electrodes 26 and 27 respectively comprises the first external connection part 26a and the second external connection part 27a formed at the lower end face in Z axis direction by being insulated against each other. At the opposing face of the weight member 30 facing against the lower end face of the element 20, the first circuit pattern 36 and the second circuit pattern 37 are formed by being insulated against each other; and the first circuit pattern 36 and the second circuit pattern 37 are respectively connected to the first external connection part 26 and the second external connection part 27 by a metal bonding.
    Type: Grant
    Filed: January 31, 2017
    Date of Patent: July 9, 2019
    Assignee: TDK CORPORATION
    Inventors: Toshiki Maruyama, Takuto Horii, Ryuichi Sakai, Shunsuke Ueno, Atsushi Ezawa, Tatsuya Taki
  • Publication number: 20180226563
    Abstract: A vibrating device includes a piezoelectric element, a resin member having electric insulation, a vibrating member made of metal, a first adhesive layer, and a second adhesive layer. The resin member includes a first principal surface and a second principal surface opposing each other. The vibrating member includes a third principal surface and a fourth principal surface opposing each other. The first adhesive layer joins the piezoelectric element and the first principal surface. The second adhesive layer joins the second principal surface and the third principal surface. An area of the resin member is greater than an area of the piezoelectric element, and an area of the vibrating member is greater than the area of the piezoelectric element. An area where the second adhesive layer adheres to the vibrating member is greater than an area where the first adhesive layer adheres to the resin member.
    Type: Application
    Filed: February 7, 2018
    Publication date: August 9, 2018
    Applicant: TDK CORPORATION
    Inventors: Kaoru KIJIMA, Tatsuya TAKI, Shunsuke UENO, Atsushi EZAWA, Haruna SUMI, Tomohiro TAKEDA
  • Publication number: 20180011282
    Abstract: A lens drive unit that offers enhanced reliability in connection between an actuator electrode and an electric wire is provided. In the lens drive unit, an actuator has a weight housed in an holding portion of a base member and is thereby fixed in the base member. Electrodes on a lateral surface of the weight directly contact respective terminal electrodes on an inner lateral surface of the holding portion, so that an electrical connection is established therebetween. The arrangement enhances reliability in connection between the actuator electrodes and the terminal electrodes.
    Type: Application
    Filed: July 5, 2017
    Publication date: January 11, 2018
    Applicant: TDK CORPORATION
    Inventors: Toshiki MARUYAMA, Naoki YUSA, Seiji FUKUOKA, Masahiro HOSOKAWA, Mio HAMASHIMA, Hiroshi TOJO, Mitsunao HOMMA, Takuto HORII, Atsushi EZAWA, Tatsuya TAKI
  • Publication number: 20180011281
    Abstract: A lens drive unit that prevents an actuator from being inclined is provided. In the lens drive unit, when a lens frame is displaced in a direction orthogonal to a direction in which the actuator extends and contracts with respect to a base member by, for example, impact from an outside of the lens drive unit, a drive shaft of the actuator abuts on a first lateral wall and a column, so that the actuator is prevented from being inclined with respect to the base member.
    Type: Application
    Filed: July 3, 2017
    Publication date: January 11, 2018
    Applicant: TDK CORPORATION
    Inventors: Masahiro HOSOKAWA, Naoki YUSA, Seiji FUKUOKA, Mio HAMASHIMA, Toshiki MARUYAMA, Hiroshi TOJO, Mitsunao HOMMA, Takuto HORII, Atsushi EZAWA, Tatsuya TAKI
  • Publication number: 20170229636
    Abstract: The present invention relates to a piezoelectric driving device 10 capable of moving the movable member 14 along the axis direction engaged in a movable manner to the axial direction with respect to the shaft 16. A pair of the external electrodes 26 and 27 respectively comprises the first external connection part 26a and the second external connection part 27a formed at the lower end face in Z axis direction by being insulated against each other. At the opposing face of the weight member 30 facing against the lower end face of the element 20, the first circuit pattern 36 and the second circuit pattern 37 are formed by being insulated against each other; and the first circuit pattern 36 and the second circuit pattern 37 are respectively connected to the first external connection part 26 and the second external connection part 27 by a metal bonding.
    Type: Application
    Filed: January 31, 2017
    Publication date: August 10, 2017
    Applicant: TDK CORPORATION
    Inventors: Toshiki MARUYAMA, Takuto HORII, Ryuichi SAKAI, Shunsuke UENO, Atsushi EZAWA, Tatsuya TAKI