KR20010106836A - The electrode pole structure of electron gun - Google Patents

Abstract

An electrode structure of an electron gun according to the present invention includes a main lens having a triode for radiating electrons and controlling and accelerating the radiated hot electrons, and a focusing electrode and an anode electrode for focusing and finally accelerating the electron beam generated by the triode. In the negative electrode for color cathode ray tubes,

The focusing electrode and the anode electrode provided in the main lens part may have a radius equal to or greater than an outer hole through which the electron beam passes as the direction of travel of the electron beam passes.

According to the present invention, the focusing electrode and the anode electrode provided in the main lens portion of the electron gun by modifying the hole so that the radius is larger or the same as the traveling direction of the electron beam, the focusing electrode in the beading process It is possible to simultaneously guide the gap and the anode electrode cup electrode, while all the electrodes are not only fixed during the beading process but also welding and fusion at the same time during the beading process to improve workability and to suppress micro deformation of the electrodes. This is to improve the hollow phenomenon on the top and bottom of the screen.

Description

The electrode pole structure of electron gun

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron gun for a color cathode ray tube, wherein a color cathode ray which can provide a high quality screen by preventing the deformation of the electrode generated during the bonding process of the electron gun electrodes and improving the upper spreading phenomenon occurring at the upper and lower ends of the screen. It relates to a tolerant electron gun.

FIG. 1 is a view showing a schematic configuration of a color cathode ray tube, which will be briefly described with reference to FIG. 1.

The neck portion 400 is mounted at the rear of the tube formed of the panel 100 and the funnel 200 and maintained in a vacuum state, and the electron gun 800 is formed inside the neck portion 400 to form the electron beam 900. do. The electron beam 900 generated by the electron gun 800 is deflected and refracted by the deflection yoke 300, and the deflected electron beam 900 passes through the shadow mask 600 for performing color screening and then the fluorescent surface 500. Collide with to form a screen.

2 is a schematic configuration diagram of a conventional color gun electron gun.

Referring to FIG. 2, the electron gun 800 includes a triode and a main lens unit. The triode includes a cathode 810 for emitting electrons and a control electrode 820 for controlling and accelerating hot electrons emitted from the cathode 810. The main lens unit includes a focusing electrode 840 and an accelerating electrode 850 for focusing and accelerating the electron beam controlled and accelerated in the triode, and the leakage magnetic field of the deflection yoke 300. A shield cup 860 for shielding is provided at the end of the electron beam traveling direction of the electron gun.

Briefly describing the operation of the color water pipe electron gun, after the electron beam emitted from the cathode 810 is controlled and accelerated while passing through the control electrode 820 and the acceleration electrode 830, the focusing electrode 840 and The light is focused at the center of the fluorescent surface while passing through the electrostatic lens formed by the voltage difference between the anode electrodes 850. At this time, the electron beam focused on the fluorescent surface is deflected by the deflection yoke 300 so that the electron beam reaches the entire region of the fluorescent surface 500.

3 to 7 are enlarged cross-sectional views showing a main lens unit and a cross section of each electrode. In more detail, a diagram schematically showing the sixth focusing electrode G5A and the anode electrode G6, and the anode hole G6 Aperture 851, the anode cup G6 Cup 852, and the sixth focusing electrode gap (G5A Cap, 853), a view showing a cross section of the sixth focusing electrode hole (G5A Aperture, 854).

Referring to FIGS. 3 to 7, the coupling process of the electrodes in the manufacturing process of the electron gun for color cathode ray tube will be described.

After inserting a mandrel (Mandrel) into the center hole and the side hole of all the electrodes, thereby guiding and fixing the electrodes, a pair of bead glass is melted and fused in the vertical direction of the electron beam through hole.

However, in the manufacturing process of the electron gun as described above, when fixing the electrodes (851,852,853,854) by using a mandrel, the electrode is not guided by the mandrel was generated.

That is, the size of each side hole of the anode electrode hole G6 Aperture 851, the anode electrode cup G6 Cup 852, the sixth focusing electrode cup G6 Cup 853, and the sixth focusing electrode hole G5A Aperture 854. G6 Cup = G5A Cap> G6 Aperture> G5A Aperture, the only difference is that the part that is actually guided when the mandrel is inserted is the anode electrode hole 851, the sixth focusing electrode hole 854, and the anode cup. 852, the sixth focusing electrode gap 853 is not guided.

As a result, the anode electrode assembly formed of the anode electrode hole 851 and the anode electrode cup 852, and the sixth focusing electrode gap 885 and the sixth focusing electrode hole without guiding the electrodes 851,852,853,854 separately on the mandrel. The sixth focusing electrode assembly 854 is formed by welding each assembly separately, and then guiding them to the mandrel to fuse the bead glass 890 to form an electron gun.

However, in the electron gun as described above, the bead glass 890 in a fluid state reaches a high temperature of about 400 ° C., and the high temperature bead glass 890 contacts the electrodes, which causes each electrode to be microscopically deformed. In addition, the micro deformation of each electrode does not occur in the anode electrode hole 851 and the sixth focusing electrode hole 854 guided by the mandrel, but the anode electrode cup 852 and the sixth focusing electrode gap which are not guided in the mandrel. (853) has a lethal effect.

In more detail, since the bead glass 890 is positioned in the vertical direction of the three R, G, and B electron beams, the amount of calories for the bead glass 890 is increased by the positive electrode cup 852 and the sixth focusing electrode 853. ) Will affect the upper and lower parts. As a result, the anode cup 852 and the sixth focusing electrode cap 853 electrodes do not have alignment in the direction of the tube axis, that is, they do not form a predetermined axis, thereby causing a problem in the path of the electron beam. ) Will occur.

The one-sided hollow is more severe in the up and down directions than in the left and right directions due to the fusion direction of the bead glass 890. This effect causes the upper and lower portions of the screen to spread to each other. Will give.

The present invention was created to improve the above problems, by modifying the hole shape of the anode electrode constituting the main lens portion of the electron gun, fusion process of the bead glass and the focusing electrode and the anode electrode of the main lens portion without a separate welding process The purpose of the present invention is to provide an electrode structure of an electron gun, which is fixed at, to prevent microdeformation of the electrodes even under the influence of heat and pressure.

1 is a schematic configuration diagram of a general color cathode ray tube.

Figure 2 is a schematic configuration diagram of a conventional common color cathode ray gun electron gun.

3 is a detailed cross-sectional view of the main lens of the electrode structure of the electron gun;

4 is a side cross-sectional view of the anode electrode hole G6 Aperture of the conventional electron gun.

Fig. 5 is a side cross-sectional view of the anode electrode cup G6 Cup of the electron gun.

6 is a side cross-sectional view of a sixth focusing electrode gap G5A Cap of the electron gun.

7 is a side cross-sectional view of a sixth focusing electrode hole G5A Aperture of the electron gun.

8 is a side cross-sectional view showing an anode electrode hole in an embodiment of an electrode structure of an electron gun according to the present invention;

<Explanation of symbols for the main parts of the drawings>

800 ... electron gun 810 ... cathode

820 ... Control electrode 830 ... Acceleration electrode

840 focusing electrode 850 anode

851,851 '... Anode Hole 852 ... Anode Cup

853 Sixth Focusing Electrode Gap 854 Sixth Focusing Electrode Hole

In order to achieve the above object, the electrode structure of the electron gun according to the present invention,

An electrode structure of an electron gun comprising a main electrode portion having a three-pole portion for radiating electrons and controlling and accelerating the radiated hot electrons, and at least one focusing electrode and an anode electrode for focusing and finally accelerating the electron beam generated by the three-pole portion. In

The focusing electrode and the anode electrode are characterized in that the radius of the outer hole through which the electron beam passes as the direction of the electron beam travels is greater or equal.

Herein, the radius of the focusing electrode hole and focusing electrode gap, which are the components of the focusing electrode, and the cathode electrode cup and the cathode electrode holes, which are the components of the anode electrode, is determined by focusing electrode hole ≤ focusing electrode gap ≤ anode electrode cup ≤ anode electrode hole. It is characterized by being processed in the order of size.

In addition, the cup of the anode electrode has a different radius of the side passage hole, but the inner radius is formed to be larger than the outer radius, characterized in that the outer radius is guided inward.

The guide part radius of the focusing electrode hole is 2.5 mm, the guide part radius of the focusing electrode gap is 4.6 mm, the radius of the guide part of the anode electrode cup is 4.6 mm, and the guide part radius of the anode electrode hole is 4.5 mm on the outer side and the inner center radius. The direction is characterized in that 6.5mm.

In addition, the cathode electrode cup may be formed to have a diameter of 8.90 mm at the center diameter of the anode electrode cup to compensate for astigmatism caused by hole shape deformation of the anode electrode.

Hereinafter, with reference to the accompanying drawings as follows.

8 is a view showing the hole of the anode electrode in the electrode structure of the electron gun according to an embodiment of the present invention. The same parts as in the prior art will be described with the same reference numerals and the construction thereof.

The size of the positive electrode hole 851 'is equal to or larger than the radius of curvature of the left and right arcs of the positive electrode cup 852 and the sixth focusing electrode gap 853 electrode, and thus, the positive electrode hole 851' in the beading process. In addition to the sixth focusing electrode hole 854, the anode electrode cup 852 and the sixth focusing electrode gap 853 may be configured to simultaneously guide the electrodes.

That is, the radius of curvature of the anode electrode and the sixth focusing electrode is to be processed such that G6 Aperture ≥ G6 Cup ≥ G5A Cap ≥ G5A Aperture.

The electrode structure of the electron gun according to the present invention configured as described above will be described with reference to FIGS. 5 to 8.

First, the radius of curvature of the guide portion R1 of the electrode of the anode cup 852 illustrated in FIG. 5 is processed to 4.6 mm, and the radius of curvature of the guide portion R2 of the sixth focusing electrode gap 853 electrode illustrated in FIG. ) Is processed to 4.6 mm, and the radius of curvature R3 of the guide portion of the sixth focusing electrode hole 854 electrode shown in FIG. 7 is 2.5 mm.

In addition, in the anode electrode hole 851 ′ shown in FIG. 8, the radius of curvature R5 of the electrode guide part is formed to be equal to 4.6 mm as the guide part radius of curvature R1 of the electrode of the anode electrode cup 852. The inner radius, that is, the radius of curvature R6 near the center hole was formed to be about 6.5 mm larger than the radius of curvature R5 of the guide portion, so that 4.6 mm of the radius of curvature R1 of the guide portion was guided.

The sixth focusing electrode assembly including the sixth focusing electrode cup 853 and the hole 854 and the cathode electrode assembly 851 'and 852 consisting of the anode gap 852 and the hole 851' are separately welded. Since the electrodes can be guided during the beading process without going through the process, the welding and fusion operations can be performed during the bidding process to prevent micro deformation of the electrodes that can occur during the beading process, By preventing the deformation of the 851 ', 852,853,854, it is possible to suppress the hollow phenomenon occurring at the upper and lower ends of the fluorescent surface to implement a cathode ray tube with better image quality.

In addition, the electron gun having the same shape as the above embodiment has a weak focusing force of the central electron beam, so that the focusing force of the central hole is improved, that is, the radius of curvature of the central hole of the sixth focusing electrode hole 854 to improve this. ) Process small from 4.8mm to 4.6mm.

In addition, in order to compensate for the astigmatism caused by changing the hole shape of the anode electrode hole 851 ', the central diameter H of the anode cup 852 is increased from 8.70 mm to 8.9 mm. It is formed so as to have the same astigmatism as the side beam.

As described above, the electrode structure of the electron gun according to the present invention is a beading process by processing so that the focusing electrode and the anode electrodes provided in the main lens portion of the electron gun can be larger or the same as the radial direction of the electron beam proceeds While simultaneously guiding to the focusing electrode gap and the anode electrode cup electrode, all electrodes are not only fixed during the beading process, but also welding and fusion are performed simultaneously during the beading process, thereby improving workability, and minimizing the electrodes By suppressing the effect of improving the hollow phenomenon of the upper and lower screens.

Claims (3)

An electron gun for a color cathode ray tube comprising a main electrode portion having a three-pole portion for radiating electrons and controlling and accelerating the radiated hot electrons, and a focusing electrode and anode electrodes for focusing and finally accelerating the electron beam generated by the three-pole portion, The focusing electrode and the anode electrodes provided in the main lens unit, the electrode structure of the electron gun, characterized in that the radius of the outer hole through which the electron beam passes as the direction of travel of the electron beam passes. The method of claim 1, The radiuses of the focusing electrode holes and focusing electrode gaps, which are components of the focusing electrode, and the cathode electrode cups and the outer periphery of the anode electrodes, which are the components of the anode, are in the order of the size of the focusing electrode holes ≤ focusing electrode gap ≤ cathode electrode cup ≤ anode electrode holes. Electrode structure of the electron gun, characterized in that processed to. The method of claim 2, The positive electrode electrode cup has a radius of the side passage hole different from each other, the inner radius of the electrode structure of the electron gun, characterized in that the outer radius is guided inward to form a larger than the outer radius.