Patents by Inventor Toshiaki Hirosawa

Toshiaki Hirosawa 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).

  • Ink jet head with testing resistors
    Patent number: 5164747
    Abstract: An ink jet head is provided with testing or inspection to facilitate efficient testing of the circuitry to determine whether any short-circuit or open circuits exist.The ink jet head includes plural ejection outlets for ejecting ink; a corresponding number of heat generating resistors disposed corresponding to the ejection outlets; heat generating resistors corresponding to the ejection outlets; electrodes connected to the respective heat generating resistors. The inspection resistors connect adjacent electrodes to permit inspection of electric connections.
    Type: Grant
    Filed: December 31, 1990
    Date of Patent: November 17, 1992
    Assignee: Canon Kabushiki Kaisha
    Inventors: Torachika Osada, Toshiaki Hirosawa, Jiro Moriyama, Hidemi Kubota, Yutaka Koizumi, Mineo Kaneko
  • Liquid injection recording method for accurately producing an image regardless of ambient temperature
    Patent number: 4980699
    Abstract: In a liquid injection recording method, the falling time of a voltage pulse applied to electromechanical converting means for generating energy for discharging liquid droplets to a recording medium is made longer under a high temperature environment than under a room temperature environment.
    Type: Grant
    Filed: October 23, 1989
    Date of Patent: December 25, 1990
    Assignee: Canon Kabushiki Kaisha
    Inventors: Sakiko Tanabe, Junji Shimoda, Toshiaki Hirosawa
  • Ink jet recording apparatus having a flexible ink supply connection
    Patent number: 4775871
    Abstract: In an ink jet recording apparatus having an ink jet recording head for discharging liquid and an ink container for containing the liquid therein, the ink jet recording head and the ink container are communicated with each other by an ink passage, and the ink passage has a separating and connecting portion having a communicating member formed of an elastic material and a fitting portion fitted to the communicating member.
    Type: Grant
    Filed: October 26, 1987
    Date of Patent: October 4, 1988
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tsutomu Abe, Toshiaki Hirosawa, Yoshie Akiyama, Isao Ebisawa, Yoshifumi Hattori
  • Ink tube connecting system in a liquid jet recording apparatus
    Patent number: 4684962
    Abstract: An ink tube connecting method in a liquid injection recording apparatus provided with an ink jet recording head unit and an ink tank for storing therein liquid to be supplied to the ink jet recording head unit, and having an ink tube communicating the ink jet recording head unit with the ink tank and an ink tube for discharging the gas and/or liquid in the ink jet recording head unit, is characterized in that a plane formed in the connecting portion of one of the ink tubes while containing the ink tubes and a plane formed in the connecting portion of the other of the ink tubes while containing the ink tubes are arranged without perpendicularly intersecting each other, and the ink tubes are integrally arranged in parallelism to each other in at least a portion thereof. The specification also discloses such liquid injection recording apparatus.
    Type: Grant
    Filed: December 23, 1985
    Date of Patent: August 4, 1987
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshiaki Hirosawa, Yoshie Akiyama, Isao Ebisawa, Yoshifumi Hattori, Tsutomu Abe