Patents by Inventor Tomonari Inaba

Tomonari Inaba 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: 4632531
    Abstract: A focusing screen in a split image coincidence type range finder provided with an objective lens forming an imaging plane comprises a plurality of light diffusing portions each of which has a surface inclined with respect to the imaging plane. A number of minute depressions or projections are formed on the inclined surface. The depressions or projections are arranged in the form of a matrix along a first direction and a second direction intersecting each other and symmetrical with respect to a fixed direction parallel to the inclined surface and the imaging plane. Each of the depressions or projections is of a pyramidic shape having as the base a parallelogram having first and second sides parallel to the first direction and third and fourth sides parallel to the second direction and extended in the fixed direction. Each of the depressions or projections is arranged so that each side of the parallelogram is common to a side of another adjacent parallelogram.
    Type: Grant
    Filed: October 16, 1985
    Date of Patent: December 30, 1986
    Assignee: Nippon Kogaku K. K.
    Inventors: Yutaka Ichihara, Nobutaka Magome, Yutaka Iizuka, Shuji Kunimatsu, Tomonari Inaba