Patents by Inventor Hidetoshi Tatemichi

Hidetoshi Tatemichi 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).

  • Information recording apparatus
    Patent number: 5128693
    Abstract: An information recording apparatus includes an acoustooptic deflector, receives a laser beam from a recording light source and an amplitude modulation signal, and diffracts the laser beam in two directions, thereby generating a carrier wave diffracted beam and a lower sideband diffracted beam. The carrier wave diffracted beam is provided with information by a spatial light modulator and modulated, and is incident, as a signal beam, on a moving recording medium. The lower sideband diffracted beam is incident, as a reference beam, on the same incident region as that of the signal beam. The two beams interfere with each other, and multiplexed recording of a hologram is performed on the recording medium.
    Type: Grant
    Filed: September 11, 1991
    Date of Patent: July 7, 1992
    Assignee: Nippon Telegraph & Telephone Corporation
    Inventors: Hidetoshi Tatemichi, Manabu Yamamoto