Patents by Inventor Hitoshi Ohzu

Hitoshi Ohzu 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).

  • Apparatus for producing optical interference pattern with continuously variable fringe spacing
    Patent number: 4009940
    Abstract: First and second triangular prisms are bonded together at their bases with a semi-transparent reflecting material therebetween. A light beam from a laser is incident on the upstream face of the first prism and refracted thereby so as to be incident on the semi-transparent reflecting material at a predetermined angle to the longitudinal axis thereof. One component of the beam is reflected from the semi-transparent material and refracted by the first prism so as to emerge therefrom parallel to the axis of the semi-transparent material. Another component of the beam passes through the semi-transparent material and is refracted by the second prism so as to emerge therefrom parallel to the axis of the semi-transparent material. A lens converges the two beam components to produce an interference pattern.
    Type: Grant
    Filed: April 22, 1975
    Date of Patent: March 1, 1977
    Assignee: Takata Ophthalmic Instruments Co., Ltd.
    Inventor: Hitoshi Ohzu