Patents by Inventor Kazutoshi Mukae

Kazutoshi Mukae 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).

  • ND filter and aperture diaphragm apparatus
    Patent number: 7230779
    Abstract: An ND filter is made of a transparent substrate having a plane. An optical film is formed on the plane of the transparent substrate. The optical film has a lamination structure including a light absorption film and a dielectric film, and has a variable transmission density. A thickness of either the light absorption film or the dielectric film of the lamination structure is changed in an in-plane direction of the transparent substrate so that the transmission density of the optical film is controlled to vary in the in-plane direction. The light absorption film is composed of a material selected from Ti, Cr, Ni, NiCr, NiFe, NiTi and a mixture thereof, and the dielectric film is formed of SiO2, Al2O3 or a compound thereof.
    Type: Grant
    Filed: May 13, 2005
    Date of Patent: June 12, 2007
    Assignee: Nidec Copal Corporation
    Inventors: Koki Kunii, Kazutoshi Mukae
  • ND filter and aperture diaphragm apparatus
    Publication number: 20050254155
    Abstract: An ND filter is made of a transparent substrate having a plane. An optical film is formed on the plane of the transparent substrate. The optical film has a lamination structure including a light absorption film and a dielectric film, and has a variable transmission density. A thickness of either the light absorption film or the dielectric film of the lamination structure is changed in an in-plane direction of the transparent substrate so that the transmission density of the optical film is controlled to vary in the in-plane direction. The light absorption film is composed of a material selected from Ti, Cr, Ni, NiCr, NiFe, NiTi and a mixture thereof, and the dielectric film is formed of SiO2, Al2O3 or a compound thereof.
    Type: Application
    Filed: May 13, 2005
    Publication date: November 17, 2005
    Applicant: Nidec Copal Corporation
    Inventors: Koki Kunii, Kazutoshi Mukae