Patents Assigned to Hitachi Electronic Devices, Ltd. Co.
  • Projection tube having different neck diameters
    Patent number: 7075221
    Abstract: The present invention aims at maintaining the high focusing performance at a low deflection power in a single-beam projection tube which is used as a projection type TV receiver or a projector and is operated at a high voltage and with a high current. The neck outer diameter of a portion on which a deflection yoke is mounted is made smaller than the neck outer diameter of a portion which accommodates an electron gun.
    Type: Grant
    Filed: August 7, 2003
    Date of Patent: July 11, 2006
    Assignees: Hitachi, Ltd., Hitachi Electronic Devices, Ltd. Co.
    Inventors: Kouichi Saitou, Kazumasa Hirai, Tetsuo Asano, Kotaro Aoki, Yasuo Tanaka