Patents Assigned to Nippon Telephone & Telegraph Corp.
  • Liquid crystal microprism array, free-space optical interconnector, and optical switch
    Patent number: 5648859
    Abstract: A liquid crystal microprism array has a plurality of grooves formed on a surface of a transparent substrate, a plurality of spaces divided by ridges of the grooves, and a plurality of liquid crystal cells placed in the spaces.
    Type: Grant
    Filed: July 27, 1994
    Date of Patent: July 15, 1997
    Assignee: Nippon Telephone & Telegraph Corp.
    Inventors: Katsuhiko Hirabayashi, Tsuyoshi Yamamoto, Masayasu Yamaguchi, Hirofumi Yamazaki
  • Synchrotron radiation source
    Patent number: 4994753
    Abstract: An industrial compact synchrotron radiation source includes, for the purpose of prolonging lifetime of a charged particle beam, beam absorbers made of a material having a low photodesorption yield and disposed inside a bending section/vacuum chamber at at least positions upon which the synchrotron radiation is irradiated, and electrically conductive beam stabilizers disposed at positions inside the bending section/vacuum chamber which are distant by a predetermined distance from an orbit of the charged particle beam toward the outer circumferential wall of the bending section/vacuum chamber.
    Type: Grant
    Filed: March 17, 1988
    Date of Patent: February 19, 1991
    Assignees: Hitachi, Ltd., Nippon Telephone & Telegraph Corp., Hitachi Service Engineering Co., Ltd.
    Inventors: Takashi Ikeguchi, Manabu Matsumoto, Shinjiroo Ueda, Tadasi Sonobe, Toru Murashita, Satoshi Ido, Kazuo Kuroishi, Akinori Shibayama