CN1155752A - Electron gun system for color cathode-ray tube - Google Patents

Abstract

The electron gun has at least one pair of plate electrodes for focussing and acceleration of heated-up electrons and at least one pair of cup-shaped focussing electrodes for the electron beam from the plate electrodes. The two or more focussing electrodes are embedded in glass pearls by melting. Preferably the embedded electrodes are in a mutually vertical arrangement. Typically the last focussing electrode has an incision at both ends for containing the embedded electrodes. The last electrode inside may contain an inner electrode with the embedded electrodes, extending through the incisions outwards.

Description

The electron gun arrangements of color cathode ray tube

The present invention relates to a kind of electron gun of color cathode ray tube, more particularly, relate to a kind of electron gun that can realize high picture quality.

Usually, the electron gun heat of emission electronics of color cathode ray tube (CRT) becomes them into electron beam, the percussion fluorescence coating, thus obtain an image.Electron gun comprises that at least one pair of is used to quicken be used to focus on cup-shaped electrode from the electron beam of plate electrode with the plate electroplax of focused electron and at least one pair of.

Converge and pass shadow mask from three electron beams of electron gun emission.They focus on the fluorescent material on the one point union bump screen.Be transformed into electron beam from the hot electron of cathode emission, and, pass the electron beam that is formed at the hole on the electrode and on same line, aim at along with it passes a plurality of electrodes.

The electron gun of in-line arrangement has an electrode, have transversely arranged, three holes that allow electron beam pass.As a result, these three electron beams that converge are interfered mutually, make electron beam produce transverse warping.In order to reduce this transverse warping, a kind of discrete internal electrode has been proposed, it has a minor diameter on main lens.

When a plurality of electrodes construct and be sequentially arranged on the glass bar (bead glass) respectively, be difficult to electron beam channel is adjusted on the same line.In order to overcome this difficulty, the outer surface that constitutes the final electrode of main focusing lens is provided with a support component, and it is embedded in the glass bar, thus the position of correcting electrode.

With reference to figure 5, it is used for illustrating the support component on the final electrode that is fixed on the condenser lens that is embedded in glass bar, and being embedded in successively on the glass bar B is one first electrode G1, one second electrode G2, one the 3rd prime focus electrode G3 and one the 4th electrode G4.Support component 100 is welded in the outside of the 4th electrode G4, and it is fork shape, yet the high-tension current that soldering will act on the 4th electrode passes on the focusing electrode, has influenced the focusing of electron beam.In addition, support component has the part that only laterally is embedded in the glass bar, and it is difficult to realize solid and reliable embedding state.This is the reason that influences electrode alignment, thereby has reduced the quality of product.

An object of the present invention is to provide a kind of method of arrangement of the electron gun electrode that is used for improving color cathode ray tube.

Another object of the present invention provides and a kind ofly is used to prevent that high-tension current from flowing to method on the focusing electrode by weld seam.

According to the present invention, a kind of electron gun comprises that at least one pair of is used to focus on and quicken thermionic plate electrode and at least one pair of and is used to focus on cup-shaped focusing electrode from the electron beam of plate electrode, wherein, above-mentioned focusing electrode has and two or morely is embedded in intercalation electrode in the middle of the glass bar by fusion; The mutual vertical arrangement of above-mentioned intercalation electrode; Last focusing electrode all has a grooving at its two ends, be used to hold above-mentioned intercalation electrode.There is an internal electrode inboard of above-mentioned last focusing electrode, and its above-mentioned intercalation electrode reaches the outside by above-mentioned grooving.

With reference to following detailed description, claims and accompanying drawing, above-mentioned or other purpose of the present invention and advantage will be more obvious, and these accompanying drawings comprise:

Fig. 1 is the sectional view of one embodiment of the invention electron gun;

Fig. 2 is the perspective view of a final electrode in the one embodiment of the invention;

Fig. 3 is the perspective view that is used for illustrating an internal electrode of the embodiment of the invention;

Fig. 4 is the perspective view that is used to illustrate an internal electrode that is connected with last electrode;

Fig. 5 is the sketch of electron gun that is used to illustrate an in-line arrangement of existing color cathode ray tube.

Introduce embodiments of the invention below with reference to above-mentioned accompanying drawing.

With reference to figure 1, on glass bar " B ", be provided with one first electrode G1 successively; One second electrode G2; A third electrode G3; With one the 4th electrode G4.The 4th electrode G4 comprises an electrode body 2, and its shape resembles a microscler cup, and it has a big general opening 3, as shown in Figure 2.Each long limit is provided with grooving 4,6, and its both sides have inserts 8,10, and this inserts stretches out perpendicular to the sidewall of electrode body.Grooving 4,6 and inserts 8,10 can pass through the Sheet Metal Forming Technology moulding.

Internal electrode 11 shapes are similar to a cup, wherein have the minor diameter opening 12,14,16 of discrete formation, as shown in Figure 3.Internal electrode on its two relative sidewalls, have respectively be parallel to its bottom surface be embedded into part 18,20.Certainly, internal electrode 11 is embedded into part 18,20 and also can comes moulding with Sheet Metal Forming Technology.

When assembling the 4th electrode G4 and internal electrode 11, be embedded into part 18,20 and stretch out grooving 4,6 on the 4th electrode.So the inserts 18,20 of embedded part on the glass bar and internal electrode 11 also flatly stretches into the groove 4,6 of the 4th electrode, keep the 4th electrode and internal electrode level, thereby inserts is being firmly fixed.In addition, do not need weld support element to come reinforced embedded member, so, the weld seam electric leakage do not had.

Because this insert structure does not use support component, so can increase work efficiency and reduce cost.

Although introduced the preferred embodiments of the present invention above, should be appreciated that those skilled in the art can make multiple variation and remodeling on this basis, so the present invention should be limited by claims and equivalent thereof.

Claims (4)

1, a kind of electron gun comprises that at least one pair of is used to focus on and quicken thermionic plate electrode and at least one pair of and is used to focus on cup-shaped focusing electrode from the electron beam of plate electrode, wherein, above-mentioned focusing electrode has and two or morely is embedded in intercalation electrode in the middle of the glass bar by fusion;

2, electron gun as claimed in claim 1, wherein, the mutual vertical arrangement of above-mentioned intercalation electrode;

3, electron gun as claimed in claim 1, wherein, last focusing electrode all has a grooving at its two ends, be used to hold above-mentioned intercalation electrode.

4, electron gun as claimed in claim 3, wherein, there is an internal electrode inboard of above-mentioned last focusing electrode, and its above-mentioned intercalation electrode reaches the outside by above-mentioned grooving.

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