Patents Represented by Law Firm Fitzpatrick, Cella, Harper, Cella
  • Electron emission device
    Patent number: 4810934
    Abstract: An electron emission device for attracting electrons emitted from an electron emission element to an anode, includes a current detector for detecting a flow-in current to said electron emission element and a flow-out current from the electron emission element. The difference between the flow-in current and the flow-out current is calculated and the voltage applied to the electron emission element is adjusted in accordance with the difference between the flow-in current and the flow-out cuttent.
    Type: Grant
    Filed: May 15, 1987
    Date of Patent: March 7, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventors: Isamu Shimoda, Takeo Tsukamoto, Akira Shimizu, Akira Suzuki, Masao Sugata, Masahiko Okunuki