Patents by Inventor Masakatu Ohta

Masakatu 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: 5105075
    Abstract: A projection exposure apparatus includes a projection optical system for projecting an image of a pattern of a first object to a second object, and an adjusting system for adjusting projection magnification and distortion of the projected image of the pattern, the adjusting system being operable to displace the first object and a lens element of the projection optical system in a direction of an optical axis of the projection optical system.
    Type: Grant
    Filed: July 8, 1991
    Date of Patent: April 14, 1992
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masakatu Ohta, Akiyoshi Suzuki
  • Patent number: 4497013
    Abstract: An illuminating apparatus is provided with an illuminating unit for forming a plurality of secondary light sources, the illuminating unit having a light source, a light converging device for converging photoenergy emitted from the light source, and a first multi-beam forming optical element for forming multiple light beams. A second multi-beam forming optical element produces a uniform luminance distribution and forms multiple light beams. A first converging optical system converges the photoenergy emitted from the first multi-beam forming optical element on the second multi-beam forming optical element, and a second converging optical system converges the photoenergy emitted from the second multi-beam forming optical element on a photomask.
    Type: Grant
    Filed: June 27, 1983
    Date of Patent: January 29, 1985
    Assignee: Canon Kabushiki Kaisha
    Inventor: Masakatu Ohta