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US 12,586,747 B2Granted
Emitter and device comprising same
AssigneeDenka Company Limited
InventorDaisuke Ishikawa
Life of this patent
Estimating the term…
Abstract
An emitter includes: an insulator; a pair of conductive terminals attached to the insulator and spaced apart from each other; a heater disposed between tips of the pair of conductive terminals and generating heat when energized; an electron source heated by the heater and made of a first material emitting electrons; a Wehnelt electrode having an inner surface forming an internal space along with a surface of the insulator, and applying a bias voltage across the Wehnelt electrode and the electron source; and a shielding member covering a part of the surface of the insulator in the internal space.
Claims8
An emitter comprising:
- an insulator;
- a pair of conductive terminals attached to the insulator and spaced apart from each other;
- a heater disposed between tips of the pair of conductive terminals and generating heat when energized;
- an electron source heated by the heater and made of a first material emitting electrons;
- a Wehnelt electrode having an inner surface forming an internal space along with a surface of the insulator, and applying a bias voltage across the Wehnelt electrode and the electron source;
- and
- a shielding member covering a part of the surface of the insulator in the internal space and spaced apart from the inner surface of the Wehnelt electrode and the pair of conductive terminals.
4 more elements
Dependencies are inferred from the claim text.