Patents by Inventor Atsuko HIRAKAWA

Atsuko HIRAKAWA 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).

  • Piezoelectric element drive circuit and state detection method, and image recording device
    Patent number: 9481166
    Abstract: Provided are a piezoelectric element drive circuit and state detection method, and an image recording device which realize state detection of a piezoelectric element inexpensively and with a suppressed circuit scale in a drive circuit for rapidly driving a large-capacity load that uses negative voltage drive. An output potential (VOUT) of a boost unit (BST) is detected in a state in which VS_AMP supplied to an amplification unit (AMP) is set to a voltage lower than a maximum rating of a transistor (FET1) by SW1, supply of VS_FET to the boost unit (BST) is blocked by SW2, and an individual electrode (28) of a piezoactuator (30) is pulled down to VS_FET via a resistor (R6).
    Type: Grant
    Filed: March 11, 2016
    Date of Patent: November 1, 2016
    Assignee: FUJIFILM Corporation
    Inventor: Atsuko Hirakawa
  • PIEZOELECTRIC ELEMENT DRIVE CIRCUIT AND STATE DETECTION METHOD, AND IMAGE RECORDING DEVICE
    Publication number: 20160193828
    Abstract: Provided are a piezoelectric element drive circuit and state detection method, and an image recording device which realize state detection of a piezoelectric element inexpensively and with a suppressed circuit scale in a drive circuit for rapidly driving a large-capacity load that uses negative voltage drive. An output potential (VOUT) of a boost unit (BST) is detected in a state in which VS_AMP supplied to an amplification unit (AMP) is set to a voltage lower than a maximum rating of a transistor (FET1) by SW1, supply of VS_FET to the boost unit (BST) is blocked by SW2, and an individual electrode (28) of a piezoactuator (30) is pulled down to VS_FET via a resistor (R6).
    Type: Application
    Filed: March 11, 2016
    Publication date: July 7, 2016
    Applicant: FUJIFILM Corporation
    Inventor: Atsuko HIRAKAWA