Patents by Inventor Yoshihito Kasai

Yoshihito Kasai 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).

  • Polarizing function element, optical isolator, laser diode module and method of producing polarizing function element
    Patent number: 7002742
    Abstract: This invention has the polarizing function of polarizing an input beam and a non-reflecting function of suppressing reflection of the input beam, wherein at least one side of a light-transmissive substrate 1 has a polarizing portion 4 with a striped structure formed by multiple alternating light-transmissive dielectric layers 2a, 2b . . . and metallic film layers 3a, 3b . . . . Its characteristics are improved if the metallic film layers are very thin and flat, with a target thickness in the range from 5 to 20 nm and variation of film thickness within the range of ±10%.
    Type: Grant
    Filed: September 19, 2001
    Date of Patent: February 21, 2006
    Assignee: Namiki Seimitsu Houseki Kabushiki Kaisha
    Inventors: Nobuo Imaizumi, Kenichi Shiroki, Yoshihito Kasai, Toshimichi Sato
  • Polarizing function element, optical isolator, laser diode module and method of producing polarizing function element
    Publication number: 20030007251
    Abstract: This invention has the polarizing function of polarizing an input beam and a non-reflecting function of suppressing reflection of the input beam, wherein at least one side of a light-transmissive substrate 1 has a polarizing portion 4 with a striped structure formed by multiple alternating light-transmissive dielectric layers 2a, 2b . . . and metallic film layers 3a, 3b . . . . Its characteristics are improved if the metallic film layers are very thin and flat, with a target thickness in the range from 5 to 20 nm and variation of film thickness within the range of ±10%.
    Type: Application
    Filed: May 20, 2002
    Publication date: January 9, 2003
    Inventors: Nobuo Imaizumi, Kenichi Shiroki, Yoshihito Kasai, Toshimichi Sato