Patents by Inventor Asaji Masuko

Asaji Masuko 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).

  • Focusing screen and method of manufacturing same
    Patent number: 5119235
    Abstract: A focusing screen of the type composed of a multitude of micro-lens-like curved surfaces arranged on a given plane is substantially regular in terms of their two-dimensional arrangement on the above-mentioned plane but exhibits some variation in terms of the height of the microscopic surface roughness formed by the micro-lens-like curved surfaces. The variation range is determined in correspondence with the pitch of the above-mentioned two-dimensional arrangement. Also disclosed is a method of manufacturing a focusing screen exhibiting an appropriate degree of randomness in terms of its surface configuration.
    Type: Grant
    Filed: December 19, 1990
    Date of Patent: June 2, 1992
    Assignee: Nikon Corporation
    Inventors: Toshiro Umeda, Hiroyuki Sugimura, Shinichi Tsukada, Noboru Yoneya, Akira Adachi, Asaji Masuko