Patents by Inventor Masao Hatayama

Masao Hatayama 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).

  • Optical deflector, production method thereof, optical scanning device, and image forming apparatus
    Patent number: 7420723
    Abstract: An optical deflector, a method of producing the optical deflector, an optical scanning device, and an image forming apparatus are disclosed that are able to save resources, provide high reliability at low cost, and enable stacked and relatively-offset polygon mirrors to be arranged precisely. The optical deflector includes a rotary member supported by a bearing with plural polygon mirrors fixed thereon. The polygon mirrors are stacked along a rotation axis of the rotary member, the polygon mirrors are relatively offset by a predetermined angle in a rotation plane of the rotary member, and an effective deflection area of each of the reflection surfaces of any one of the polygon mirrors is positioned away from a center of the corresponding reflection surfaces of the other one of the polygon mirrors in the direction of the rotation axis.
    Type: Grant
    Filed: December 26, 2006
    Date of Patent: September 2, 2008
    Assignees: Ricoh Company, Ltd., Tohoku Ricoh Co., Ltd.
    Inventors: Yukio Itami, Kazuhiro Koseki, Makoto Endo, Yoshihiro Takahashi, Tomotaka Takamura, Noriyuki Kadowaki, Takeshi Kikuchi, Hidetoshi Kojima, Takao Abe, Masao Hatayama
  • OPTICAL DEFLECTOR, PRODUCTION METHOD THEREOF, OPTICAL SCANNING DEVICE, AND IMAGE FORMING APPARATUS
    Publication number: 20070153349
    Abstract: An optical deflector, a method of producing the optical deflector, an optical scanning device, and an image forming apparatus are disclosed that are able to save resources, provide high reliability at low cost, and enable stacked and relatively-offset polygon mirrors to be arranged precisely. The optical deflector includes a rotary member supported by a bearing with plural polygon mirrors fixed thereon. The polygon mirrors are stacked along a rotation axis of the rotary member, the polygon mirrors are relatively offset by a predetermined angle in a rotation plane of the rotary member, and an effective deflection area of each of the reflection surfaces of any one of the polygon mirrors is positioned away from a center of the corresponding reflection surfaces of the other one of the polygon mirrors in the direction of the rotation axis.
    Type: Application
    Filed: December 26, 2006
    Publication date: July 5, 2007
    Inventors: Yukio Itami, Kazuhiro Koseki, Makoto Endo, Yoshihiro Takahashi, Tomotaka Takamura, Noriyuki Kadowaki, Takeshi Kikuchi, Hidetoshi Kojima, Takao Abe, Masao Hatayama