Patents by Inventor Daizo Fukuzawa

Daizo Fukuzawa 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 fixing apparatus
    Patent number: 5552874
    Abstract: An image fixing apparatus includes a heating member for heating an unfixed image carried on a recording material; a fixing temperature controller for providing a variable fixing temperature of the heating member; wherein when the fixing temperature is lowered, an interval of recording material supply to the heating member is increased.
    Type: Grant
    Filed: April 28, 1994
    Date of Patent: September 3, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yasumasa Ohtsuka, Yohji Tomoyuki, Akira Hayakawa, Manabu Takano, Daizo Fukuzawa, Atsuyoshi Abe
  • Fixing apparatus with variable fixing temperature
    Patent number: 5534987
    Abstract: A fixing apparatus includes a heating member; a temperature detecting member for detecting the temperature of the heating member; a power supply controller for controlling the power supply to the heating member so that the temperature detected by the temperature detecting element during a fixing operation is maintained substantially constant at a predetermined fixing temperature; and a temperature selecting device for selecting a fixing temperature in response to both the temperature of the heating member before beginning of the fixing temperature control and a rate of the temperature change of the heating member upon supplying a predetermined amount of power to the heating member or upon turning it off.
    Type: Grant
    Filed: July 28, 1995
    Date of Patent: July 9, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yasumasa Ohtsuka, Shunji Nakamura, Takashi Soya, Kouichi Okuda, Yohji Tomoyuki, Akira Hayakawa, Manabu Takano, Daizo Fukuzawa, Hidenobu Suzuki, Atsuyoshi Abe
  • Image heating apparatus changing set temperature in accordance with temperature of heater
    Patent number: 5464964
    Abstract: An image heating apparatus includes a heater; temperature detector for detecting a temperature of the heater; electric power supply controller for controlling electric power supply to the heater during image heating, so that the temperature detector detects a predetermined set temperature; and a temperature determining device for determining the set temperature on the basis of a change of the temperature detected by the temperature detector when electric power supply to the heater is stopped.
    Type: Grant
    Filed: December 8, 1992
    Date of Patent: November 7, 1995
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kouichi Okuda, Shunji Nakamura, Toshio Yoshimoto, Yasumasa Ohtsuka, Yohji Tomoyuki, Daizo Fukuzawa, Tomoko Nanbu, Hidenobu Suzuki
  • Image fixing device capable of controlling heating overshoot
    Patent number: 5444521
    Abstract: An image heating device which includes a heater; a temperature detecting element to detect a temperature of the heater; and a controller for controlling power supply to the heater, so that the temperature detected by the temperature detecting member is maintained at a predetermined temperature, and the controller controls the power supply to the heater, based on a rising speed of the temperature detected during a period from the time when the power supply to the heater is started till the time when the temperature reaches the predetermined temperature.
    Type: Grant
    Filed: July 13, 1992
    Date of Patent: August 22, 1995
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yohji Tomoyuki, Shunji Nakamura, Yasumasa Ohtsuka, Kouichi Okuda, Eihiro Sakaki, Akira Hayakawa, Daizo Fukuzawa
  • Image heating apparatus capable of changing duty ratio
    Patent number: 5365314
    Abstract: An image heating apparatus includes a heater; a temperature detecting member for detecting a temperature of the heater; the controller for controlling electric power supplied to the heater so that the temperature detected by the temperature detecting member is maintained at a predetermined temperature; comparing device for comparing the temperature detected by the temperature detecting member to the reference temperature; wherein, when the detected temperature remains to be no less than the reference temperature for a predetermined period of time, the controller reduces a duty ratio of the electric power to be supplied to the heater.
    Type: Grant
    Filed: March 29, 1993
    Date of Patent: November 15, 1994
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kouichi Okuda, Shunji Nakamura, Yasumasa Ohtsuka, Yohji Tomoyuki, Akira Hayakawa, Daizo Fukuzawa
  • Image heater having film guide with projections
    Patent number: 5280155
    Abstract: An image heating apparatus includes a heater and a film movable together with a recording material carrying an image so that the image on the recording material is heated by heat from the heater through the film. A guiding member guides a surface of the film that contacts the heater, and the guiding member has a surface with projections effective to reduce a contact area between the guiding surface and the film. In addition, a lubricant is supplied between the guiding surface and the film so as to reduce frictional contact.
    Type: Grant
    Filed: July 17, 1992
    Date of Patent: January 18, 1994
    Assignee: Canon Kabushihi Kaisha
    Inventors: Yasumasa Ohtsuka, Shunji Nakamura, Kouichi Okuda, Yohji Tomoyuki, Akira Hayakawa, Daizo Fukuzawa