JPH1074466A - Electron gun for cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize the deformation of an end part by the high temperature treatment of an electrode and provide an electron gun with little dispersion by forming a reinforcing bead extending to the edge of the electrode to increase the bending rigidity vertical to the long axial electrode surface in the end part of the electrode. SOLUTION: In a flat G2 electrode 3, three electron beam passing holes 3a, 3b, 3c are formed on the long axial central line X, and a pair of beads 3d, 3e having a length extending from one long axial edge 31 of this electrode to an edge 3k are formed on both sides thereof. Since the reinforcing beads 3d, 3e extending from one long axial edge 31 to the other edge 3k are provided with the three electron beam passing holes 3a, 3b, 3c between, the bending rigidity in the surface vertical to the G2 electrode 3 surface passing the central line X in the end parts 3f, 3g is increased. Therefore, deformation of the end parts 3f, 3g of the G2 electrode 3 in high temperature treatment is minimized, and the G2 electrode 3 can be sufficiently closely fitted to a spacer 5 in the assembling of an electron gun to minimize the dispersion of the space between the electrode 3 and the electrode opposed thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a flat electrode such as a G2 electrode used for an electron gun for a cathode ray tube.

[0002]

2. Description of the Related Art A G used in a cathode ray tube electron gun will be described below.
A description will be given using two electrodes as an example. FIG. 4 is an enlarged side view showing a triode portion when assembling a conventional electron gun for a cathode ray tube.
Only two electrodes and spacers are shown in cross section. To assemble the electron gun, a flat G-shaped electrode is provided between the G1 electrode 4 and the G2 electrode 3.
12 Spacer 5 is inserted, and G2 electrode 3 and G3
After the plate-like G23 spacer 6 is inserted between the electrodes 2 and is fixed and supported so that the gap between the electrodes is fixed, the fixing portion of each electrode is embedded in the bead glass 1 and fixed. , G12 spacer 5 and G23 spacer 6 are removed so that the distance between the electrodes becomes constant.

FIG. 5 is a plan view of a G2 electrode used in a conventional electron gun for a cathode ray tube. The G2 electrode 3 has a substantially rectangular shape and is formed on three longitudinally extending center lines X. On both sides of the electron beam passage holes 3a, 3b, 3c, a pair of reinforcing beads 3d, 3e for preventing deformation having a length reaching the outer ends of the electron beam passage holes 3a, 3c on both sides are formed. Fixed portions 3h and 3i embedded in the bead glass 1 are formed at the ends in the directions.

The distance between the G1 electrode 4 and the G2 electrode 3, and
The distance between the two electrodes 3 and the G3 electrode 2 is, as described above,
A flat plate-shaped G12 spacer 5 is inserted between the G1 electrode 4 and the G2 electrode 3 at the position shown by a two-dot chain line in FIG.
By inserting the three spacers 6 and fixing the fixed portions of the electrodes in the state of being in close contact with each other by embedding them in the bead glass 1, the distance between the electrodes, that is, the three electron beam passing holes 3a, 3b,
Since the distance between the electrodes facing 3c is made constant, if the surfaces of the spacers 5, 6 and the surfaces of the electrodes 2, 3, 4 are not in close contact, it is difficult to assemble the electrodes with high precision. Can not.

By the way, in a conventional electron gun for a cathode ray tube,
Before assembling each electrode and fixing it with the bead glass 1, each electrode is subjected to a high-temperature treatment for degassing. When this high-temperature treatment is performed, the plate-shaped G2 electrode is particularly easily deformed. If the G2 electrode is deformed, the G12 electrode and the G23 spacer do not adhere sufficiently to the G2 electrode. The distance between the electrode and the electrode facing the electrode varies.

FIG. 6 is a view for explaining a modification of the G2 electrode by the high-temperature treatment. Even if the G2 electrode 3 before the high-temperature treatment has a shape with good flatness as shown in FIG. By the high-temperature treatment, the end portions 3f and 3g in the long axis direction, that is, the portions outside the electron beam passage holes 3a and 3c on both sides as shown in FIG. 6B are deformed so as to be bent. Since the amounts of deformation of the end portions 3f and 3g vary, in the case of this modified example, the variation in the distance between the G1 electrode 4 and the G2 electrode 3 of the assembled electron gun increases.

In order to reduce the deformation due to the high temperature treatment, the conventional G2 electrode 3 is provided with a pair of reinforcing beads 3d and 3e as shown in FIG. There is a problem that the effect of preventing deformation cannot be obtained, and the variation in the electrical characteristics of the cathode ray tube cannot be sufficiently reduced.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an electrode structure capable of reducing deformation of a flat electrode due to high-temperature treatment.

[0009]

An electron gun for a cathode ray tube according to the present invention has a plurality of electron beam passage holes formed side by side on a line and a length reaching an end with the plurality of electron beam passage holes interposed therebetween. And a plate-like electrode having a reinforcing portion formed thereon.

The reinforcing portion is formed to have a length reaching the edge of the flat electrode. Further, two or more pairs of reinforcing portions are formed on both sides of the plurality of electron beam passage holes. The reinforcing portion is a protruding portion formed by stamping a flat electrode.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be specifically described with reference to the drawings showing the embodiments. Embodiment 1 FIG. FIG. 1 is a plan view of a G2 electrode according to Embodiment 1 of the present invention. In the figure, reference numeral 3 denotes a plate-like G2 electrode, and three electron beam passage holes 3 are provided on the center line X in the long axis direction.
a, 3b, 3c are formed, and a pair of reinforcing beads 3d, 3e having a length from one end 3j in the long axis direction of the electrode to the other end 3k are formed on both sides thereof. Here, the reinforcing beads 3d and 3e are rib-shaped protrusions formed by stamping. Reference numerals 3f and 3g denote long-axis end portions, and 3h and 3i denote fixing portions formed on both sides in the short-axis direction. These portions are embedded and fixedly supported in the bead glass 1 as a support material shown in FIG. is there.

According to the first embodiment, a pair of reinforcing beads 3d and 3e extending from one edge 3j in the long axis direction to the other edge 3k is formed into three electron beam passage holes 3a and 3e.
Since b and 3c are interposed therebetween, the bending stiffness in the plane perpendicular to the G2 electrode 3 surface passing through the center line X at the end portions 3f and 3g increases. For this reason, the G2 electrode 3 during high-temperature processing
And the G2 electrode 3 and the G12 spacer 5 can be sufficiently adhered to each other when assembling the electron gun, so that the variation in the distance between the G2 electrode 3 and the electrode facing the G2 electrode 3 is reduced. can do.

Embodiment 2 FIG. FIG. 2 is a plan view of the G2 electrode 3 according to Embodiment 2 of the present invention. Embodiment 2
Is such that the length of a pair of reinforcing beads 3d and 3e is formed from the slightly inner end of one edge 3j to the slightly inner end of the other edge 3k in the long axis direction. is there.

According to the second embodiment, the ends 3f, 3
The bending stiffness on a plane perpendicular to the surface of the G2 electrode 3 passing through the center line X at the point g is the same as that of the first embodiment, and G in the direction perpendicular to the center line X at the ends 3f and 3g.
The bending rigidity in a plane perpendicular to the two electrodes 3 can also be increased.

Embodiment 3 FIG. 3 is a plan view of a G2 electrode 3 according to a third embodiment of the present invention. In the third embodiment, one edge 3j in the longitudinal direction and the other edge in the longitudinal direction sandwich the electron beam passage holes 3a to 3c. A pair of first and second reinforcing beads 3d1 and 3e1, and 3d2 and 3e2 reaching 3k are provided.

In the third embodiment, a pair of first and second reinforcing beads 3d1 and 3e1, and 3d2 and 3e2 extending from one edge 3j to the other edge 3k are provided.
The length of each reinforcing bead 3d1 and 3e1, and the length of 3d2 and 3e2 is set to one end 3j in the long axis direction as in the second embodiment.
May be formed to have a length from the slightly inner end to the slightly inner end of the other edge 3k.

According to the third embodiment, the end portions 3f, 3
g, the bending stiffness in a plane perpendicular to the G2 electrode 3 surface passing through the center line X is further increased, so that the deformation of the ends 3f and 3g during the high-temperature treatment is further reduced, and the G2 electrode 3 during the assembly of the electron gun is reduced. And the G12 spacer 5 can be improved in adhesion, so that the variation in the distance between the G2 electrode 3 and the electrode facing the G2 electrode 3 can be further reduced.

[0018]

As described above, according to the present invention, a pair of electrodes that reach the edge of the electrode or an end near the edge of the electrode on both sides of the plurality of electron beam passage holes formed in the flat electrode. Alternatively, since a plurality of pairs of reinforcing beads are formed to increase the bending rigidity in a direction perpendicular to the electrode surface in the long axis direction of the end of the electrode, the deformation of the end due to the high-temperature treatment of the electrode is reduced. For this reason, the variation in the interval between the opposing electrodes of the electron gun assembled using this electrode is reduced, and there is an effect that a cathode ray tube having a small variation in electrical characteristics can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view of a G2 electrode according to Embodiment 1 of the present invention.

FIG. 2 is a plan view of a G2 electrode according to Embodiment 2 of the present invention.

FIG. 3 is a plan view of a G2 electrode according to Embodiment 3 of the present invention.

FIG. 4 is an enlarged side view showing a three-electrode portion in a cross section taken along line IV-IV in FIG. 5 when the conventional electron gun for a cathode ray tube is assembled.

FIG. 5 is a plan view of a conventional G2 electrode.

6 is a sectional view taken along the line VI-VI of FIG. 5 for explaining a modification of the conventional G2 electrode by high-temperature treatment.

[Explanation of symbols]

1 Bead glass (support member), 2 G3 electrode, 3 G
2 electrodes (plate-like electrodes), 3a to 3c electron beam passage holes, 3d, 3e reinforcing beads, 3f, 3g end portions, 3
h, 3i fixed part, 3j, 3k edge, 4 G1 electrode,
5 G12 spacer, 6 G23 spacer.

Claims (4)

[Claims] 1. A flat electrode having a plurality of electron beam passage holes formed side by side on a line and a reinforcing portion formed to a length reaching an end with the plurality of electron beam passage holes interposed therebetween. An electron gun for a cathode ray tube, comprising: 2. The electron gun for a cathode ray tube according to claim 1, wherein the reinforcing portion has a length reaching an edge of the flat electrode. 3. The electron gun for a cathode ray tube according to claim 1, wherein two or more pairs of reinforcing portions are formed on both sides of the plurality of electron beam passage holes. 4. The reinforcing portion is a projection formed by stamping a plate-like electrode.
5. The electron gun for a cathode ray tube according to claim 1.