Electron emission device
AssigneeCanon Kabushiki Kaisha
InventorsIsamu Shimoda, Takeo Tsukamoto, Akira Shimizu, Akira Suzuki, Masao Sugata, Masahiko Okunuki
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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.
Claims14
An electron emission device for attracting electrons emitted from an electron emission element to an anode, comprising:
- current detection means for detecting a flow-in current to said electron emission element and a flow-out current from said electron emission element;
- operation means for calculating a difference between the flow-in current and the flow-out current;
- and
- voltage control means for adjusting a voltage applied to said electron emission element in accordance with the difference between the flow-in current and the flow-out current.
An electron emission device for attracting electrons emitted by an electron emission element to an anode, comprising:
- electron flow detection means for detecting an amount of electron flow emitted from said electron emission element;
- and
- voltage control means for adjusting at least one of a voltage applied to said electron emission element and a voltage applied to said anode in accordance with the output of said electron flow detection means.
Dependencies are inferred from the claim text.