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An electron gun with a circular flat cold cathode with a circular truncated and cylindrical combined grid structure

A cold cathode and grid hole technology, applied in the field of electron guns, can solve the problems of cathode damage, electron beam trajectory divergence, ignition, etc., and achieve uniform distribution of electric field, avoid ignition, and good emission uniformity.

Active Publication Date: 2017-05-31
SOUTHEAST UNIV
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Problems solved by technology

[0005] Purpose of the invention: In order to solve the deficiencies in the prior art, the present invention provides an electron gun of a circular planar cold cathode with a combined grid hole structure of a circular frustum and a column. By changing the shape of the grid hole and the emitting cathode, the traditional field emission cathode is avoided Problems such as sparking, cathode damage, and divergence of electron beam trajectories caused by over-concentration solve the shortcomings of existing technologies

Method used

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  • An electron gun with a circular flat cold cathode with a circular truncated and cylindrical combined grid structure
  • An electron gun with a circular flat cold cathode with a circular truncated and cylindrical combined grid structure

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Embodiment Construction

[0020] The present invention will be further explained below in conjunction with the accompanying drawings.

[0021] like figure 2 As shown, an electron gun of a circular planar cold cathode with a combined grid hole structure of a circular platform and a columnar structure includes a cathode, a grid 3, a first anode 8 and a second anode 10, and the cathode includes a cathode substrate 1 and is made on the cathode The field emission cathode 2 on the upper surface of the substrate 1, the gate 3 is arranged between the cathode and the first anode 8, and the gate 3 is provided with a grid hole 7 corresponding to the field emission cathode 2, and the first anode 8 Arranged between the grid 3 and the second anode 10, the first anode is provided with a first anode hole 9 corresponding to the grid 3; the position of the upper surface of the cathode substrate 1 corresponding to the grid hole 7 is provided with a conical protrusion structure, the field emission cathode 2 covers the c...

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Abstract

The invention discloses a cold cathode electron gun allowing a circular plane cathode to correspond to a circular-truncated-cone-shaped and column-shaped combination grid hole. The cold cathode electron gun comprises a cathode, a grid, a first anode and a second anode. The cathode comprises a cathode substrate and a field emission cathode manufactured on the upper surface of the cathode substrate, and an upper surface circular surface portion of a circular-truncated-cone-shaped protruding structure is covered with the field emission cathode to form the circular plane cathode. Compared with a traditional field emission cathode electron gun, the cold cathode electron gun has the advantages that emission surface electric fields are distributed uniformly, easy to control and good in emission uniformity, and sparking and cathode damage occurring because a fringing field of a traditional field emission cathode is excessively concentrated can be avoided effectively; under the combination control of the grid and the first anode, the converging tendency of motion tracks of emitted electron beams can be more obvious.

Description

technical field [0001] The invention relates to the field of electron guns, in particular to an electron gun with a circular planar cold cathode with a combined grid hole structure of a circular platform and a column. Background technique [0002] The traditional field emission cathode electron gun technology, especially the field emission cathode electron gun made by screen printing method, such as figure 1 As shown, it includes a cathode, a grid, a first anode and a second anode, and the cathode includes a cathode substrate and a cathode emission material (cold cathode material or field emission cathode) made on the surface of the cathode substrate, and the grid is arranged on Between the cathode and the first anode, a grid hole corresponding to the cathode emitting material is provided on the grid, the first anode is arranged between the grid and the second anode, and a grid hole corresponding to the grid hole is provided on the first anode. The first anode hole; general...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J29/48
CPCH01J3/021H01J29/481
Inventor 朱卓娅于彩茹狄云松张晓兵王琦龙
Owner SOUTHEAST UNIV
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