Electron gun
AssigneeShanghai United Imaging Healthcare Co., Ltd.
InventorsRuiying Song, Peng Cheng
Life of this patent
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Abstract
An electron gun may include a cathode with an emitting surface configured to emit electrons. The cathode may include a through hole that goes through the emitting surface and is configured to allow back-streaming electrons of the emitted electrons to pass through. The electron gun may also include an anode configured to attract the emitted electrons from the cathode to the anode and focus the emitted electrons into an electron beam. The electron gun may also include a grid structure configured to facilitate the focusing of the emitted electrons, the grid structure being positioned corresponding to the through hole.
Claims18
An electron gun, comprising:
- a cathode with an emitting surface configured to emit electrons, the cathode including a through hole that goes through the cathode and is configured to allow back-streaming electrons of the emitted electrons to pass through;
- an anode configured to attract the emitted electrons from the cathode to the anode and focus the emitted electrons into an electron beam;
- and
- a grid structure configured to facilitate the focusing of the emitted electrons, the grid structure being positioned corresponding to the through hole;
- and a grid electrode including a plurality of first meshes configured to allow the electrons emitted from the cathode or the back-streaming electrons to pass through, wherein the plurality of first meshes include a center mesh corresponding to the through hole, the center mesh is configured to prevent the back-streaming electrons from impacting the grid electrode, and the center mesh is centered on a common axis of the electron gun.
Dependencies are inferred from the claim text.