Patents by Inventor Mitsuhiro Nonaka

Mitsuhiro Nonaka 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: 4669859
    Abstract: A developing device for developing an electrostatic latent image formed on an imaging surface includes a developing electrode disposed opposite to the imaging surface and a control circuit for controlling the potential of the developing electrode. In one form, when the control circuit causes the developing electrode to be electrically floating, the upper limit of the voltage excursion is set at different levels as desired. In another form, the control circuit includes a sensor for sensing the potential of the imaging surface thereby allowing to carry out so-called fixed bias or auto-bias developing modes. In a further form, the mode of developing operation is automatically set depending upon the position of a pressure plate which is to be placed on an original for keeping the original in position during copying process.
    Type: Grant
    Filed: March 22, 1983
    Date of Patent: June 2, 1987
    Assignee: Ricoh Company, Ltd.
    Inventors: Manabu Mochizuki, Itsuo Ikeda, Tsuneo Kurotori, Satoshi Shinguryo, Seiichi Miyakawa, Yuichi Kobayashi, Mitsuhiro Nonaka, Haruhiko Fukuda
  • Patent number: 4420246
    Abstract: An improved multiple reproduction apparatus is provided. The apparatus includes an original holder for holding thereon an original from which multiple copies are to be made and an optical system for leading a light image of the original to a desired position, the optical system constituting a part of the exposure system of the apparatus. Either of the original holder or optical system is movably provided with respect to the other, which is fixedly provided on the apparatus. The present apparatus further comprises wait time control means so that the original holder or optical system stays still for a predetermined period of time at its home position in response to the size of the original or copy paper.
    Type: Grant
    Filed: November 5, 1981
    Date of Patent: December 13, 1983
    Assignee: Ricoh Company, Ltd.
    Inventors: Mitsuhiro Nonaka, Yuichi Kobayashi