Patents by Inventor Kenji Kazaoka

Kenji Kazaoka 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).

  • Liquid ejection device and inkjet printer including the same
    Patent number: 10449761
    Abstract: A driving signal generation circuit generates a main driving signal including, in each of driving periods, at least a first sub driving signal including a first driving pulse and a second driving pulse, and a second sub driving signal including a third driving pulse and provided before the first sub driving signal. A driving signal supply circuit includes a first dot generator supplying the first sub driving signal but not supplying the second sub driving signal to an actuator coupled with a vibration plate defining a portion of a pressure chamber, and a second dot generator supplying the first sub driving signal and the second sub driving signal to the actuator.
    Type: Grant
    Filed: January 24, 2018
    Date of Patent: October 22, 2019
    Assignee: ROLAND DG CORPORATION
    Inventors: Keisuke Misawa, Kenji Kazaoka
  • Liquid discharge device and inkjet printer including the same
    Patent number: 10214010
    Abstract: A driving signal generating circuit generates, for each driving period, a main driving signal including a first sub driving signal including a first driving pulse, a second sub driving signal including a second driving pulse, and a third sub driving signal including a third driving pulse. The third sub driving signal follows the second sub driving signal. A driving signal supplying circuit includes a second dot former to supply the second sub driving signal and the third sub driving signal to an actuator coupled to a defining plate defining a portion of a pressure chamber, without supplying the first sub driving signal to the actuator. The third driving pulse starts after a lapse of a preset time from the start of the second driving pulse. The preset time is equal to a value of about p×Tc, where p is greater than 2.
    Type: Grant
    Filed: March 16, 2018
    Date of Patent: February 26, 2019
    Assignee: ROLAND DG CORPORATION
    Inventors: Keisuke Misawa, Kenji Kazaoka
  • LIQUID DISCHARGE DEVICE AND INKJET PRINTER INCLUDING THE SAME
    Publication number: 20180290445
    Abstract: A driving signal generating circuit generates, for each driving period, a main driving signal including a first sub driving signal including a first driving pulse, a second sub driving signal including a second driving pulse, and a third sub driving signal including a third driving pulse. The third sub driving signal follows the second sub driving signal. A driving signal supplying circuit includes a second dot former to supply the second sub driving signal and the third sub driving signal to an actuator coupled to a defining plate defining a portion of a pressure chamber, without supplying the first sub driving signal to the actuator. The third driving pulse starts after a lapse of a preset time from the start of the second driving pulse. The preset time is equal to a value of about p×Tc, where p is greater than 2.
    Type: Application
    Filed: March 16, 2018
    Publication date: October 11, 2018
    Inventors: Keisuke MISAWA, Kenji KAZAOKA
  • LIQUID INJECTION DEVICE AND INKJET PRINTER INCLUDING THE SAME
    Publication number: 20180222185
    Abstract: A driving signal generation circuit generates a main driving signal including, in each of driving periods, at least a first sub driving signal including a first driving pulse and a second driving pulse, and a second sub driving signal including a third driving pulse and provided before the first sub driving signal. A driving signal supply circuit includes a first dot generator supplying the first sub driving signal but not supplying the second sub driving signal to an actuator coupled with a vibration plate defining a portion of a pressure chamber, and a second dot generator supplying the first sub driving signal and the second sub driving signal to the actuator.
    Type: Application
    Filed: January 24, 2018
    Publication date: August 9, 2018
    Inventors: Keisuke Misawa, Kenji Kazaoka