Patents by Inventor Tkaaki Yanagisawa

Tkaaki Yanagisawa 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).

  • Image forming apparatus having system for reducing noise
    Patent number: 5289147
    Abstract: An image forming apparatus includes a housing, a mechanism, mounted in the housing, for forming images on a medium, an operation panel formed on the housing, the mechanism being driven in accordance with an operating instruction input from the operation panel by an operator, a microphone, provided in the housing, for detecting a noise generated by a driving of the mechanism, and a noise canceling unit for outputting an acoustic wave to an area adjacent to the operation panel of the housing, the acoustic wave being generated based on the noise detected by the microphone so that the acoustic wave and a noise present in the area cancel out, whereby the noise present in the area is reduced.
    Type: Grant
    Filed: May 5, 1992
    Date of Patent: February 22, 1994
    Assignee: Ricoh Company, Ltd.
    Inventors: Tadao Koike, Kenji Fukumizu, Hiroo Kitagawa, Fumihiko Ishikawa, Tkaaki Yanagisawa, Satoshi Kanda