Patents by Inventor Kasuke Yamamoto

Kasuke Yamamoto 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).

  • Stepping motor control circuit and analogue electronic timepiece
    Patent number: 8319468
    Abstract: The present invention aims to prevent a main drive pulse from being moved to a rank having a potential to cause a non-rotating state. A detection segment for detecting a rotating state of a stepping motor is divided into a first segment immediately after the drive with a main drive pulse, a second segment, and a third segment and, when the stepping motor is rotated by the main drive pulse, the main drive pulse is not changed when a detection signal exceeding a reference threshold voltage is detected at least in the first and second segments. When it is detected only in the first and third segments, or detected only in the third segment, the rank is moved upward and, when it is not detected in any segment, or detected only in the first segment, the rank is moved upward after the drive with a corrective drive pulse. When it is detected only in the second segment or detected only in the second and third segments, the rank is moved downward.
    Type: Grant
    Filed: May 28, 2009
    Date of Patent: November 27, 2012
    Assignee: Seiko Instruments Inc.
    Inventors: Saburo Manaka, Takanori Hasegawa, Keishi Honmura, Kasuke Yamamoto, Kenji Ogasawara, Hiroyuki Masaki, Akira Takakura, Kazuo Kato, Kazumi Sakumoto
  • Stepping motor control circuit and analogue electronic timepiece
    Publication number: 20100172219
    Abstract: The present invention aims to prevent a main drive pulse from being moved to a rank having a potential to cause a non-rotating state. A detection segment for detecting a rotating state of a stepping motor is divided into a first segment immediately after the drive with a main drive pulse, a second segment, and a third segment and, when the stepping motor is rotated by the main drive pulse, the main drive pulse is not changed when a detection signal exceeding a reference threshold voltage is detected at least in the first and second segments. When it is detected only in the first and third segments, or detected only in the third segment, the rank is moved upward and, when it is not detected in any segment, or detected only in the first segment, the rank is moved upward after the drive with a corrective drive pulse. When it is detected only in the second segment or detected only in the second and third segments, the rank is moved downward.
    Type: Application
    Filed: May 28, 2009
    Publication date: July 8, 2010
    Inventors: Saburo Manaka, Takanori Hasegawa, Keishi Honmura, Kasuke Yamamoto, Kenji Ogasawara, Hiroyuki Masaki, Akira Takakura, Kazuo Kato, Kazumi Sakumoto