Patents by Inventor Jiro Ohta

Jiro Ohta 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: 4838710
    Abstract: A static pressure gas bearing assemby having a gaseous fluid discharging bearing member for supporting a shaft by the discharged gaseous fluid is disclosed. The bearing member is made of porous graphite. For the manufacture, carbon particles approximately 80% of which have particle diameters not greater than approx. 40 microns, more particularly, particle diameters ranging from 1-20 microns are used. The carbon particles are subjected to molding, calcination and graphitization, whereby a porous graphite member having pores distributed substantially uniformly is obtained. In another aspect of the invention, the bearing member is made of a porous graphite material having a specific degree of swelling. Also, in another aspect, the surface of the shaft to be supported by the bearing member is coated with titanium nitride by ion plating treatment. In this manner, a high-precision and high-prerformance bearing assembly can be provided with reduced manufacturing costs.
    Type: Grant
    Filed: September 29, 1987
    Date of Patent: June 13, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventors: Jiro Ohta, Sadamu Tozawa, Koichi Matsushita, Yutaka Maruyama
  • Patent number: 4639190
    Abstract: An operating rod is connected at its one end to a runner vane rotary shaft through a link and lever mechanism. The operating rod is supported by a rotational propelling force bearing. The rotational propelling force bearing is reciprocatingly moved through a link and lever mechanism by a servomotor disposed outside of a stay ring. With such a construction, the rotational operation of the runner vanes may be smoothly attained.
    Type: Grant
    Filed: May 15, 1985
    Date of Patent: January 27, 1987
    Assignee: Hitachi, Ltd.
    Inventor: Jiro Ohta