Patents by Inventor Koichi Maruyuma

Koichi Maruyuma 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).

  • Method and apparatus for measuring lens performance
    Patent number: 5335059
    Abstract: A method and apparatus for lens measurement that provide for a small error of measurement where a light source used for measurement emits a beam of light at a wavelength different from an operating wavelength of a lens to be measured. The spherical aberration of the lens being measured, which occurs at the nonoperating wavelength, is identified and measured. An auxiliary lens is then placed in the path of the light source emitting the beam of light with the nonoperating wavelength to suppress the spherical aberration. This method allows for performance measurements of the lens to be obtained at the nonoperating wavelength without the adverse effects of the spherical aberration which occurred at the nonoperating wavelength.
    Type: Grant
    Filed: May 5, 1992
    Date of Patent: August 2, 1994
    Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventors: Koichi Maruyuma, Syun'itirou Wakamiya, Makoto Iwaki