Patents by Inventor Yoshiaki Nishida

Yoshiaki Nishida 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).

  • Patent number: 7511727
    Abstract: The present invention employs novel phase control for a fixing heater, which uses first and second heaters, to reduce the generation of a higher harmonic wave current and a power line terminal noise. With four consecutive half wavelengths (two cycles) of a power supply voltage employed as a period, two half waves are used for phase control and other two half waves are made full ON or full OFF for each of the first and second heaters and, at the same time, the phase control is performed complimentarily to both the heaters. That is, for each half wave, when the power is turned on with the phase control of one heater, the other heater is made full ON or full OFF. This causes turn-on switching to occur only on at most one heater in a half wave period. As a result, as compared with usual phase control, a power-supply higher-harmonic-wave current and a power line terminal noise are reduced.
    Type: Grant
    Filed: December 27, 2004
    Date of Patent: March 31, 2009
    Assignee: Canon Finetech Inc.
    Inventor: Yoshiaki Nishida
  • Publication number: 20070116485
    Abstract: The present invention employs novel phase control for a fixing heater, which uses first and second heaters, to reduce the generation of a higher harmonic wave current and a power line terminal noise. With four consecutive half wavelengths (two cycles) of a power supply voltage employed as a period, two half waves are used for phase control and other two half waves are made full ON or full OFF for each of the first and second heaters and, at the same time, the phase control is performed complimentarily to both the heaters. That is, for each half wave, when the power is turned on with the phase control of one heater, the other heater is made full ON or full OFF. This causes turn-on switching to occur only on at most one heater in a half wave period. As a result, as compared with usual phase control, a power-supply higher-harmonic-wave current and a power line terminal noise are reduced.
    Type: Application
    Filed: December 27, 2004
    Publication date: May 24, 2007
    Applicant: Canon Finetech Inc.
    Inventor: Yoshiaki Nishida
  • Patent number: 6853818
    Abstract: A fixing device includes a fixing heater for being supplied with an AC voltage to generate heat; control means for variably controlling power of supplied electric energy to the fixing heater, wherein one cyclic period for changing the electric power comprises a plurality of waves, and the one cyclic period including a portion in which an electric power supply phase is changed and a portion in which a number of waves of the electric power supply is controlled.
    Type: Grant
    Filed: October 10, 2002
    Date of Patent: February 8, 2005
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yoshiaki Nishida
  • Publication number: 20030072581
    Abstract: A fixing device includes a fixing heater for being supplied with an AC voltage to generate heat; control means for variably controlling power of supplied electric energy to the fixing heater, wherein one cyclic period for changing the electric power comprises a plurality of waves, and the one cyclic period including a portion in which an electric power supply phase is changed and a portion in which a number of waves of the electric power supply is controlled.
    Type: Application
    Filed: October 10, 2002
    Publication date: April 17, 2003
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Yoshiaki Nishida
  • Patent number: 6301454
    Abstract: There are provided three periods of time immediately after an AC power-supply voltage is started to be applied to fixing heaters when the heater temperature falls below a target temperature: a first period for driving only a first heater; a second period for driving only a second heater following the first period; and a third period for driving the first and second heaters following the second period. During the first and second periods, the first and second heaters are thinning-controlled, respectively. At this time, at a cycle of 3 half-waves of the AC voltage applied to each fixing heater, a thinning frequency is changed from a large value to a smaller one. The third period includes first and second sub periods which are alternately repeated. In at least one of the first and second sub periods, the first and second heaters are thinning-controlled and the relation of the thinning controls of the two heaters is such that they are complementary to each other on the time axis.
    Type: Grant
    Filed: March 14, 2000
    Date of Patent: October 9, 2001
    Assignee: Copyer Co., Ltd.
    Inventors: Yoshiaki Nishida, Yasuhiro Suzuki
  • Patent number: D286290
    Type: Grant
    Filed: July 1, 1983
    Date of Patent: October 21, 1986
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventor: Yoshiaki Nishida
  • Patent number: D287510
    Type: Grant
    Filed: June 4, 1984
    Date of Patent: December 30, 1986
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yoshiaki Nishida
  • Patent number: D288823
    Type: Grant
    Filed: July 18, 1984
    Date of Patent: March 17, 1987
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yoshiaki Nishida
  • Patent number: D289098
    Type: Grant
    Filed: June 22, 1984
    Date of Patent: March 31, 1987
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yoshiaki Nishida
  • Patent number: D289216
    Type: Grant
    Filed: August 16, 1984
    Date of Patent: April 7, 1987
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yoshiaki Nishida
  • Patent number: D295109
    Type: Grant
    Filed: October 21, 1986
    Date of Patent: April 5, 1988
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yoshiaki Nishida
  • Patent number: D295569
    Type: Grant
    Filed: September 2, 1986
    Date of Patent: May 3, 1988
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yoshiaki Nishida
  • Patent number: D302621
    Type: Grant
    Filed: September 4, 1986
    Date of Patent: August 1, 1989
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yoshiaki Nishida
  • Patent number: D302973
    Type: Grant
    Filed: March 21, 1986
    Date of Patent: August 22, 1989
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yoshiaki Nishida
  • Patent number: D303376
    Type: Grant
    Filed: March 21, 1986
    Date of Patent: September 12, 1989
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yoshiaki Nishida
  • Patent number: D307724
    Type: Grant
    Filed: December 18, 1987
    Date of Patent: May 8, 1990
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yoshiaki Nishida
  • Patent number: D309472
    Type: Grant
    Filed: May 29, 1986
    Date of Patent: July 24, 1990
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yoshiaki Nishida
  • Patent number: D322966
    Type: Grant
    Filed: September 29, 1989
    Date of Patent: January 7, 1992
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Maki Kasano, Yoshiaki Nishida
  • Patent number: D323156
    Type: Grant
    Filed: December 6, 1989
    Date of Patent: January 14, 1992
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yoshiaki Nishida
  • Patent number: D330909
    Type: Grant
    Filed: September 26, 1990
    Date of Patent: November 10, 1992
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yoshiaki Nishida