Patents by Inventor Hideo Imazeki

Hideo Imazeki 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).

  • Optical adder for optical attenuation
    Patent number: 4963004
    Abstract: There is provided an optical adder for accurately and additively specifying variable optical attenuation, which comprises a quarter wave plate disposed on an optical axis for changing an incident linearly polarized light beam emanating from a light source to a circularly polarized light beam; and one or more neutral density filter plates all disposed on the optical axis next to said quarter wave plate for attenuating the incident circularly polarized light beam respectively additively by a predetermined amount.
    Type: Grant
    Filed: September 22, 1989
    Date of Patent: October 16, 1990
    Assignee: Ando Electric Co., Ltd.
    Inventors: Masaichi Sato, Hideo Imazeki