CN1293445A

CN1293445A - High-current High-definition electronic gun with dual acceleration electrodes

Info

Publication number: CN1293445A
Application number: CN 00134021
Authority: CN
Inventors: 刘秀; 朱锦林; 肖顺禄
Original assignee: ZHENMEI AUDIO AND VIDEO TECHNOLOGIES Co Ltd BEIJING
Current assignee: ZHENMEI AUDIO AND VIDEO TECHNOLOGIES Co Ltd BEIJING
Priority date: 2000-12-07
Filing date: 2000-12-07
Publication date: 2001-05-02

Abstract

A high-current high-difinition electronic gun with dual accelerating electrodes for optimizing the shape of electronic beam features that original accelerating electrode behind the first modulating grid is now divided into two, one with smaller central hole and another with bigger central hole.

Description

A kind of high-current High-definition electronic gun with dual acceleration electrodes

The invention belongs to the electric vacuum display device field, specially refer to the electron gun of the two intensifying rings of a kind of big electric current high-resolution that are used for cathode ray tube (CRT).

Weigh the quality of cathode ray tube performance, at first to weigh one of parts of this pipe most critical, the quality of electron gun performance, this development group once was devoted to obtain the electron gun of a good pack in the CRT pipe and had been engaged in multinomial research, especially and strengthened under the situation of cathode ray tube electron beam electric current, the electron gun that still keeps the high-resolution performance, after the simulated experiment of passing through repeatedly electron beam trace, seek a kind of preferable design result, and declared United States Patent (USP): IMPROVED BEAM FORMING REGION FORELECTRON GUN with this, the present invention has done further research and improvement on the basis of this design, on the basis of existing single intensifying ring (G2) structure, further improve the subtended angle that bundle forms district's electron beam, and electron gun is improved to two electron gun structures.

The electron gun that is used for CRT, generally can be divided into two districts, the 1st district is an electron beam forming area, it is by the electron beam emission source---and cathode K, Wehnelt electrode, intensifying ring and anode fore-end are formed, this district relates to the emission and the formation of electron beam, pencil size when this district has determined that electron beam enters the electron optics main lens and the subtended angle of bundle, it is the area segments that influences electron beam divergence state and aberration to greatest extent; The 2nd district is the condenser lens district, and this zone is to make electron-beam convergence to the phosphor screen of CRT.The content of this patent research is at electron beam forming area, the intensifying ring G2 of conditional electronic rifle is that an electrode constitutes, this patent has been studied and has been adopted 2 intensifying ring G21 and two electrodes of G22 formation that different apertures is arranged, see shown in Fig. 2 structure, G22 electrode near anode G3, its aperture is bigger than the G2 aperture near G1, concrete size is by determining in the trace simulation experiment, about adding current potential, G21 and G22 can adopt same potential, also can keep small according a difference, this structure is from the electron optics angle, be equivalent between former G2 and G3, increase simple pit lens, these lens have been controlled the disperse function to electron beam, because the G22 aperture increases, prefocus lens is increased than conditional electronic rifle corresponding position lens dynamics, so just reduced the effect of spherical aberration, also reduced the beam angle that electron beam enters the main lens district simultaneously, make under the big electric current more than the 1mA, still can obtain the less spot definition of good pack, promptly under the situation that the height of CRT increases, the pack of bundle is degenerated, just can not reduce definition, on the basis of above analysis, propose the purpose and the concrete scheme of this patent.

Purpose of the present invention, be in order to overcome in prior art, adopt the electron gun of single accelerating electrode structure can't obtain still to keep under the current state high-resolution this defective, and redesign a kind of electron gun structure, allow it can be under big electric current, still to keep the performance that obtains high definition.

The present invention relies on following technical proposals to realize, a kind of high-current High-definition electronic gun with dual acceleration electrodes, comprise cathode assembly, electron beam forming area and condenser lens district, it is characterized in that, be positioned at after the first grid Wehnelt electrode G1, will speed up utmost point G2 and be divided into two electrodes, first accelerator is the centre bore G21 electrode littler than former G2 aperture; The second acceleration machine is the centre bore G22 electrode bigger than former G2 aperture; According to the requirement that the electronics of simulation is annotated trajectory shape, G21 and G22 can adopt same potential, also can adopt different potentials.

Described two accelerating electrodes can adopt G21 and G22 to be the diaphragm structure that has centre bore, also can adopt the G22 electrode is made the bowl structure that has centre bore.

Good effect of the present invention is, adopt two accelerating electrodes to have the bigger degree of freedom to adjust the best Potential distribution of electron beam forming area, and be easier to adjust electrode film hole dimension and two distances of separating between the acceleration pole plate, thereby realize the optimal design and the engineer testing of beam shapes, to obtain the electron gun of good pack, improve the resolution of CRT under big electric current, in addition, the electrode slice of two separation is than the original thick easy processing and manufacturing of single electrode.

Further specify embodiment below in conjunction with accompanying drawing:

Description of drawings:

Bundle forms the plot structure schematic diagram in Fig. 1 conditional electronic rifle;

Fig. 2 is that bundle forms the plot structure schematic diagram in two intensifying ring electron guns;

Fig. 3 a is electron beam trace analogue test figure in the conditional electronic rifle;

Fig. 3 b is electron beam trace analogue test figure in two intensifying ring electron guns;

Fig. 4 is two intensifying ring electron gun general assembly contour structures schematic diagrames.

Among the figure, 1 is cathode assembly, and it is the heart of electron gun, the emission source of electron beam, the grid of next-door neighbour's cathode plane is a modulation grid 2, the current potential of its control cathode surface, thus reach the dynamic emission of modulated electron beam, intensifying ring 3 and 3 ' assembly side by side by bipolar electrode G21 and G22, single intensifying ring in the alternative electron gun in the past of the bipolar electrode of this composition can make electron beam have good pack performance, and the pencil electronics enters the main lens district with little subtended angle, by G3 anode 4

Illustrated embodiments proves, annotate between each pole piece that the trace simulation test decides after the position by electronics, when with G21, when G22 adds same potential, the electron beam operating current is under the operating current situation more than the 1mA, can obtain than the littler spot definition of electron beam in the past, work as G21, the current potential that G22 adds is not simultaneously, through adjusting under the current state that can also make below the 2mA, obtain the ratio littler spot definition of electron beam in the past, can reach an electron gun like this and satisfy two kinds of operating states respectively, promptly use in field of television, operating current is big, be the exhibit high brilliance dynamic image, can have high definition; In the data of computer system showed, operating current was little, i.e. two intensifying ring current potentials of scalable satisfy the needs of operating state.

Claims

1, a kind of big electric current high-resolution double speed adds utmost point electron gun, comprise cathode assembly, electron beam forming area and condenser lens district, it is characterized in that, be positioned at after the first grid Wehnelt electrode G1, will speed up utmost point G2 and be divided into two electrodes, first accelerator is the centre bore G21 electrode littler than former G2 aperture; The second acceleration machine is the centre bore G22 electrode bigger than former G2 aperture, and according to the requirement that the electronics of simulation is annotated trajectory shape, G21 and G22 can adopt same potential, also can adopt different potentials.

According to described pair of intensifying ring electron gun of claim 1, it is characterized in that 2, described two accelerating electrodes can adopt G21 and G22 to be the diaphragm structure that has centre bore, also can adopt the G21 electrode is made the bowl structure that has centre bore.