JPH0740471B2 - Electron gun electrode structure - Google Patents

Description

The present invention relates to an electron gun electrode assembly used in a cathode ray tube.

[Conventional technology]

In a normal color cathode ray tube, a cathode structure that individually generates three electron beams, and an integrated electrode that is electrically and structurally common and forms substantially individual or common electron lenses in each electron beam passage. An in-line type electron gun equipped with is widely used.

FIG. 4 and FIG. 5 show an example of an electron gun electrode assembly having such a structure. In an in-line type electron gun that generates three electron beams in the same plane, the main electron lens has a bi-potential potential.
FIG. 6 is a front view and a side view of the in-line type electron gun electrode assembly 1 adopting the focus method, and FIG. 6 is a sectional view taken along line AA of FIG. The electron gun electrode assembly 1 includes three cathode assemblies 10 which are insulated from each other and arranged in a line at equal distances S in the same plane.
A, 10B, 10C and G1 electrode 11, G2 electrode 12, and G3 electrode, which are electrically common to each other and are sequentially arranged in the electron beam traveling direction so that three electron beam transmission apertures are arranged inline
13, an electrode support 15 composed of a G4 electrode 14 and integrally formed on each electrode, and an auxiliary support 16 attached as necessary to reinforce the support strength, on two insulator support rods 17. By embedding and fixing, a predetermined electrode interval is maintained.

In the cathode structures 10A, 10B, 10C of the electron gun electrode structure 1, three cathodes are provided at a predetermined distance b from the G1 electrode 11 corresponding to the electron beam paths maintained at the distance S, and are attached to the support cylinders of the respective cathode structures. Inserted and fixed.

In the color cathode ray tube equipped with the electron gun electrode structure, a cathode driving method is used in which a luminance signal is applied to an electrically independent cathode, and the cathode of each electron gun and the G1 electrode are designed in terms of a circuit design for high quality image reception. Distance b, distance f between G1 electrode 11 and G2 electrode 12
There absolute value of the cathode cut-off voltage COE _K determined by setting the size of the manufacturing process and the like within a predetermined value, and it is desirable close to 1.0 as long as possible the ratio of the maximum value to the minimum value in the same cathode-ray tube, for example, Max. COE _K /Min.COE _K ≦ 1.15 is required. In order to do this, a method of precisely setting the distances b and f and various electrode structures have been proposed. Furthermore, as shown in Fig. 7, COE _K variations due to dimensional variations within the same electron gun electrode assembly that cannot be compensated by these methods and structures are shown in Fig. 7.
G1 electrode 11A, 11B, 11C, which is an electrically completely divided G1 electrode
It is known that the COE _Ks are matched in the same electron gun by applying a DC bias to each of them.

On the other hand, when the color cathode ray tube is used as a high-density display device such as a data display or a graphic display as a computer terminal device, the horizontal deflection speed of the cathode ray tube should be four times or more that of the current TV in order to achieve higher density display. The speed is _{increased to} 64 _KHZ or higher, and the video frequency is set to 100 to 200 _MHZ or higher accordingly. In this case, it is very difficult to obtain a large amplitude of the input signal voltage to the cathode ray tube corresponding to the high-frequency video signal, that is, the cathode driving voltage in view of circuit design and usable circuit elements, and the cathode driving voltage is small. And it becomes impossible to obtain the necessary and sufficient brightness from the cathode ray tube. However, as described above, if the G1 electrode 11 is electrically divided into three, the input signal voltage to the cathode ray tube can be applied by being superimposed on the cathode and the G1 electrode, and even if the input signal amplitude of each is small. As a combined effect, the drive signal to the cathode ray tube is doubled, and it becomes possible to easily obtain the required brightness.

[Problems to be solved by the invention]

As described above, if the G1 electrode can be electrically divided into three parts, it is possible to electrically correct the variation of the three cathode cutoff voltages in the same cathode ray tube, or to superimpose the drive voltage on both the cathode and the corresponding G1 electrode. Although there is an advantage that sufficient brightness can be obtained even with a small excitation signal amplitude, it is difficult to support the electrode gun electrode assembly because it needs to be housed in a limited space within the inner diameter of the neck of the cathode ray tube. The structure is complicated as shown in FIG. Even with such a complicated support structure, the support of the G1 electrodes 11A and 11C on both outer sides is unstable, the gap between the G1 electrode and the G2 electrode cannot be precisely set, the cathode cutoff voltage greatly varies, and the electro-optical characteristics are improved. There is a drawback that it deteriorates and the image quality characteristics of the cathode ray tube deteriorate.

The present invention has been made in view of the above-described drawbacks, and is electrically and structurally common to the cathode structure that individually generates three electron beams, and is substantially individual or common to each electron beam passage. In an in-line type electron gun electrode assembly having an integrated electrode forming an electron lens of the above, at least one of the electrodes is electrically divided into three, and an electron having a structure capable of precisely setting a relative distance between the electrodes. A gun electrode assembly is provided.

[Means for solving problems]

The present invention provides a cathode structure for individually generating three electron beams, at least one split type electrode that is electrically divided into three parts, and is electrically and structurally common to each other so that each electron beam path is substantially In an in-line type electron gun electrode structure provided with an integrated electrode that individually or commonly forms an electron lens, the split type electrode has three electron beam transmission apertures and is substantially equal to other integrated electrodes. It is formed as an integrated electrode having a facing area, and it is fixed to a common insulating substrate, and then only the metallic electrode part is formed by laser light etc. with a central electrode having an electrode supporter integrally formed in advance. It is characterized in that it is divided into both outer electrode portions having no electrode support. With this configuration, the split electrode can maintain the relative position of the center and both outer electrode parts with high accuracy, and the support part may be formed on a part of the center electrode, and the structure is simple. Since the electrodes are rigid and the three electrodes are commonly fixed to the insulating substrate, the electrodes have a mechanically integrated rigid structure, and deformation is unlikely to occur. The relative distance between the electrodes provided can be set precisely.

〔Example〕

FIG. 1 is a split type control electrode showing an embodiment of the present invention.
FIG. 2 is a plan view showing a state in which the G1 electrode 20 is embedded and supported in the insulator support rod 17, and FIG. 2 is an insulating substrate for integrally fixing the G1 electrode.
30 is a perspective view, FIG. 3 (a) is a perspective view of the G1 electrode before division,
FIG. 3 (b) is a sectional view taken along line AA of FIG. 3 (a).

As shown in FIG. 1, the split-type G1 electrode 20 has three elements, an outer electrode 21A, 21C having an electron beam transmission hole 22 formed in the substantially center thereof, and a central electrode 21B, and an insulating element that supports and fixes them in common. It is composed of a substrate 30. As shown in Fig. 3, the split type G1
Initially, the electrode 20 is an integrated electrode having a facing area substantially equal to that of another integrated electrode having a substantially oval shape in which three electron beam transmission holes 22 are formed in a straight line at equal intervals S. Has become. The electron beam transmission holes are surrounded by embossing 23 to maintain and enhance their flatness.
A guide hole 24 is formed on a straight line that is orthogonal to the arrangement direction of the electron beam transmission holes 22 arranged in-line and passes through each electron beam transmission hole 22.
Two perforations are formed so as to sandwich each permeation hole.
Further, a linear thin portion 27 is formed between the central transmission hole portion and the outer transmission hole portion as shown in FIG. 3 (b), which is divided into outer electrode portions 21A and 21C and a central electrode portion 21B, respectively. , The central electrode portion 21B has a bent portion 2 at both ends of the electrode surface in the direction of connecting the guide hole 24.
6 is formed, and an electrode supporter 25 having a notch 25A for enhancing the fusion bonding strength to the insulator support rod 17 is integrally formed at the tip as a second plane. As shown in FIG. 2, the insulating substrate 30 is a substrate formed of ceramics such as alumina in a generally oval shape, and the outer shape of the G1 electrode before division fits on one surface of the substrate, and the plate of the electrode forming material is used. A recessed portion 31 having a depth of about a thickness is formed, and the embossed portion 23 of the G1 electrode is formed within the recessed portion 31.
Has a diameter that fits, and three openings 32 are formed in a straight line at the same intervals as the transmission holes 22, and are perpendicular to the array direction, and on a straight line passing through the center of each opening 32. Two guide holes 34 corresponding to the guide holes 24 of each electrode portion are formed. The split-type G1 electrode 20 is fitted into the concave portion 31 of the insulating substrate 30, and fine glass powder is put between them and baked in a furnace to bond and fix both. At this time, the guide holes 24, 34 can be used as a reference for alignment between the two. On the other hand, the linear thin portion 27 of the split type G1 electric piece 20 is pressed or etched as shown in the AA cross-sectional enlarged view of FIG. V-shaped groove is already formed,
The linear thin-walled part is the integrated product of the split G1 electrode 20 and the insulating substrate 30.
27 is irradiated with, for example, laser light to be cut, and divided into outer electrodes 21A and 21C and a central electrode 21B as shown in FIG.

The split-type G1 electrode 20 configured in this manner is completely electrically independent, but mechanically integrated by the insulating substrate 30,
Moreover, since both are bonded before cutting, the relative positional accuracy of the outer electrode and the central electrode is maintained with high accuracy even after cutting, as with before cutting. Further, the central electrode 21B has an electrode supporter 25 integrated with the central electrode 21B, which simplifies the structure as an electrode and allows the same treatment as a conventional integrated electrode when assembling the electron gun electrode structure. ing. Both outer electrodes 21A and 21C, and the central electrode 21B are rigid insulating substrates 30.
Since the split type G1 electrode 20 has a mechanically integrated rigid body structure, the split type G1 electrode 20 will not be deformed during the assembling of the electron gun electrode assembly or its support will be unstable. Therefore, the mutual distance between the electrodes arranged in front of and behind the split type G1 electrode 20 can be precisely set with respect to the set value without being changed by the deformation of the G1 electrode. The guide holes 24 and 34 can also be used as guide holes for an assembly jig when assembling the electron gun electrode.

On the other hand, in the conventional mutual distance setting between electrodes, at the time of assembling the electron gun electrode structure, a spacer having a predetermined thickness is inserted between the electrodes, and it is taken out after the assembly, but in the present invention, the split type G1 electrode 20 If the thickness of the outer side of the insulating substrate 30 is appropriately set, it can also serve as a spacer, and in this case, even if it is assembled as an electron gun electrode assembly, it is not necessary to remove the spacer, and the electron gun electrode The structure can have a more rigid rigid structure with no variation in the electrode spacing. When laser light is used to cut the electrodes, if transparent quartz glass is used as the material of the insulating substrate 30, the laser light is transparent and heat resistant, so only the electrode is selected without damaging the substrate. It becomes even easier to cut off. Alternatively, if a high-pressure jet water flow is used as the cutting means, it is possible to easily cut only the electrode without damaging the substrate by adjusting the pressure.

In the above description, the G1 electrode is taken up as a split type electrode structure for convenience, but it is needless to say that the present invention is applicable to other electrodes as well.

〔The invention's effect〕

As described above, if the disassembled G1 electrode of the present invention is used, even if it is electrically disassembled into three, the electrode support structure is simple, and the mechanically integrated rigid body structure is obtained. Is less likely to occur, and the relative distance between the G2 electrodes in the direction perpendicular to the G1 electrode surface can be set precisely. Moreover, since the division of the electrodes is cut after being adhered and fixed to the substrate, the relative positional accuracy of each electrode after the division is kept as high as that before the division.

Therefore, the cathode cutoff voltage varies within the same electron gun,
Deterioration of the electro-optical characteristics is prevented, the image quality characteristics of the cathode ray tube are not affected, and three video signals to the cathode ray tube can be applied by superimposing them on the cathode and G1 electrodes, and even with a small input signal amplitude, Necessary driving can be easily performed without giving a large load to the circuit performance as a synthetic effect.
Furthermore, even if the cathode cutoff voltage varies within the electron gun,
By applying a DC bias voltage to the electrically divided G1 electrodes, it is possible to adjust the variation and make the drive signal levels the same.

[Brief description of drawings]

FIG. 1 is a plan view showing a state in which a split type G1 electrode according to an embodiment of the present invention is embedded in an insulator supporting rod, and FIG. 2 is a perspective view of an insulating substrate integrally fixing the G1 electrode. FIG. 3 (a) is a perspective view of a split type G1 electrode, FIG. 3 (b) is an enlarged sectional view taken along the line AA of FIG. 3 (a), FIGS. 4 and 5 are conventional in-line type electron guns. FIG. 7 is a front view, a side view, FIG. 6 is a sectional view taken along the line AA in FIG. 4, and FIG. 7 is a sectional view corresponding to FIG. 6 of a conventional split type G1 electrode. 1 ... Electron gun electrode assembly, 10A, 10B, 10C ... Cathode assembly, 1
1 …… G1 electrode, 12 …… G2 electrode, 13 …… G3 electrode, 14 …… G4
Electrode, 17 ... Insulator support rod, 20 ... Split type G1 electrode, 21A,
21C ... Outer electrode, 21B ... Central electrode, 22 ... Electron beam transmitting hole, 23 ... Embossing, 24, 34 ... Guide hole, 25 ... Electrode support, 27 ... Linear thin portion, 30 ... … Insulating substrate, 31 ……
Recessed part, 32 ... Open hole.

Claims (1)

[Claims] 1. A cathode assembly for individually generating three electron beams, at least one split type electrode which is electrically divided into three parts, and is electrically and structurally common to each electron beam passage. In an in-line type electron gun electrode assembly provided with an integrated electrode forming a substantially individual or common electron lens, the split type electrode has three electron beam transmission apertures and another integrated electrode. After fixing an integrated electrode having a substantially equal facing area to a common insulating substrate, a central electrode part having an electrode support integrally formed with only the metal electrode part in advance,
An electron gun electrode assembly, characterized in that the electron gun electrode structure is formed by being divided into both outer electrode portions having no electrode support.