Patents Assigned to Director General of National Institute for Research in Inorganic Materials, Science and Technology Agent, Japan
  • Hologram recording apparatus and method therefor
    Patent number: 6535472
    Abstract: A hologram recording apparatus is capable of directing interferable signal light and reference light into a hologram recording medium to record an information signal carried by the signal light. The hologram recording medium is sensitive to a first light at a first wavelength in an ultraviolet or short-wavelength visible light band to develop light induced absorption. The apparatus includes a light source for irradiating the hologram recording medium with the first light, and a laser light source for irradiating the hologram recording medium with signal light and reference light at a second wavelength longer than the first wavelength after the first light is irradiated.
    Type: Grant
    Filed: August 2, 2000
    Date of Patent: March 18, 2003
    Assignees: Director General of National Institute for Research in Inorganic Materials, Science and Technology Agent, Japan, Pioneer Corporation
    Inventors: Myeongkyu Lee, Kenji Kitamura, Yasunori Furukawa, Shunji Takekawa, Hideki Hatano
  • Two-color hologram recording/reproducing apparatus
    Patent number: 6373806
    Abstract: A two-color hologram recording/reproducing apparatus is capable of directing interferable signal light and reference light into a hologram recording medium to record an information signal carried by the signal light. The hologram recording medium is sensitive to a first light at a first wavelength in an ultraviolet or short-wavelength visible light band to develop light induced absorption. The apparatus includes a light source for irradiating the hologram recording medium with the first light, a laser light source for irradiating the hologram recording medium with signal light and reference light at a second wavelength longer than the first wavelength after the first light is irradiated, and a gate light source for directing gate light at a third wavelength into the hologram recording medium.
    Type: Grant
    Filed: August 2, 2000
    Date of Patent: April 16, 2002
    Assignees: Director General of National Institute for Research in Inorganic Materials, Science and Technology Agent, Japan, Pioneer Corporation
    Inventors: Kenji Kitamura, Yasunori Furukawa, Shunji Takekawa, Myeongkyu Lee, Satoru Tanaka, Takashi Yamaji, Hideki Hatano