Patents by Inventor Rokuro Watabe

Rokuro Watabe 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 imaging system for electrophotography
    Patent number: 4132477
    Abstract: A converging lens projects a light image of an original document along an optical path onto the surface of a photoconductive drum. A dichroic mirror is disposed in the optical path to reflect the light image and has a reflectance characteristic selected in accordance with the spectral sensitivity characteristic of the drum. Unwanted wavelengths are transmitted through the dichroic mirror and absorbed by an absorption plate. The dichroic mirror and absorption plate are housed in a hermetically sealed casing with the converging lens being fixed to and constituting a portion of the casing.
    Type: Grant
    Filed: December 23, 1976
    Date of Patent: January 2, 1979
    Assignee: Ricoh Company, Ltd.
    Inventors: Rokuro Watabe, Makoto Ohira, Katsuo Sakai