Patents by Inventor Youji Serizawa

Youji Serizawa 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 recording apparatus using optical beam for applying a transfer bias of a polarity so as not to repel adhesive toner
    Patent number: 5943082
    Abstract: In a laser beam printer, automatic optical quantity (APC) control is performed based on an optical quantity detection output to generate a laser beam having a predetermined quantity of light. In each scanning cycle, APC is effected by utilizing a period (unblanking period) in which the laser device is forcibly actuated to generate a horizontal synchronization signal. The unblanking period may be changed according to the print paper size or image formation/non-image-formation periods. Also, light quantity control may be effected through a plurality of scanning cycles before image formation and may be effected by utilizing the unblanking period during the period corresponding to the intervals of print sheets. Techniques also provided to prevent a transfer unit from being contaminated by toner images formed as a byproduct of APC.
    Type: Grant
    Filed: February 1, 1995
    Date of Patent: August 24, 1999
    Assignee: Canon Kabushiki Kaisha
    Inventors: Seiji Uchiyama, Akio Noguchi, Yukihide Ushio, Shinpei Matsuo, Youji Serizawa, Makoto Takeuchi, Kazurou Yamada, Junichi Kato
  • Image recording apparatus using optical beam
    Patent number: 5463410
    Abstract: In a laser beam printer, automatic optical quantity (APC) control is performed based on an optical quantity detection output to generate a laser beam having a predetermined quantity of light. In each scanning cycle, APC is effected by utilizing a period (unblanking period) in which the laser device is forcibly actuated to generate a horizontal synchronization signal. The unblanking period may be changed according to the print paper size or image formation/non-image-formation periods. Also, light quantity control may be effected through a plurality of scanning cycles before image formation and may be effected by utilizing the unblanking period during the period corresponding to the intervals of print sheets. Techniques also provided to prevent a transfer unit from being contaminated by toner images formed as a byproduct of APC.
    Type: Grant
    Filed: June 1, 1994
    Date of Patent: October 31, 1995
    Assignee: Canon Kabushiki Kaisha
    Inventors: Seiji Uchiyama, Akio Noguchi, Yukihide Ushio, Shinpei Matsuo, Youji Serizawa, Makoto Takeuchi, Kazurou Yamada, Junichi Kato