JP2764970B2 - Method of manufacturing electron gun electrode assembly for cathode ray tube - Google Patents

Description

The present invention relates to a method for manufacturing an electron gun electrode assembly for a cathode ray tube.

G ₁ electrode and G ₂ electrode of the electron gun electrode structure used in the [prior art] cathode ray tube, generally, the stainless steel or Fe-Ni-based alloy material of approximately the thickness 0.25~0.35mm press molding, The passing holes for the emitted electrons have a diameter of 0.3 to 0.6 mm.

[Problems to be solved by the invention]

The improved follower-Kas characteristics recently, G ₁ electrode shown in FIG. 5 and FIG. 6, or the plate thickness t ₁ of the surrounding emission electron passing hole 1 of G ₂ electrode in a circular or rectangular, moreover, very Thinning is becoming an essential condition.

Conventionally, as a method for obtaining the ultra-thin portion 2, there is a method of forming by coining in press molding, and a method of forming an ultra-thin plate 3 having a radiation electron passage hole 1 shown in FIG. A bonding method has been put to practical use.

However, recently, there has been a difficult problem in the formation of the ultra-thin portion 2 by the above-mentioned processing method, particularly due to a demand for improving the focus characteristics of the display tube and improving the electrode assembly accuracy.

That is, the ultra-thin portion 2 is required to have a thickness of about 50 to 70 μm, and in order to obtain this, it is necessary to press-mold the base material from a thickness of 0.25 to 0.35 mm. The coining rate (extremely thin part / base metal sheet thickness) by general press molding is limited to 50 to 60%, and it is impossible to obtain the required coining rate of 20 to 30%. Therefore, there is a problem that the coining process is performed in several steps as an improvement measure, and it is necessary to add a preliminary hole forming process and an annealing process in an intermediate forming process, which requires a very large number of processing steps. there were.

Also, in the method of bonding an extremely thin portion of 50 to 70 μm as shown in FIG. 7, there is a problem that the accuracy of the plane CC ′ and the accuracy are deteriorated due to insufficient strength of the electron gun electrode assembly. I was

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electron gun electrode assembly for a cathode ray tube, which does not require processing steps and does not deteriorate assembly accuracy due to insufficient strength.

[Means for solving the problem]

The present invention relates to a method of manufacturing an electron gun electrode assembly for a cathode ray tube having a G1 electrode and a G2 electrode sealed in a neck portion of a cathode ray tube, wherein the G1 and G2 electrodes are circular or rectangular on a sheet-like base material (5). Press recesses (6) having a predetermined depth (H and a diameter D) are formed at predetermined intervals by a roller coining method, then softening annealing is performed, and then the concave depressions are pressed with a punch and a die. An ultra-thin portion (2) is formed by a pressure method, and a radiation electron passage hole (1) is formed in the ultra-thin portion.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view for explaining a method of processing an electrode part of an electrode assembly for an electron gun for a cathode ray tube according to the present invention, and FIG.
FIG. 3 is a sectional view taken along the line A ', FIG. 3 is a side view for explaining a method of forming a concave depression by a roller coining method, and FIGS.
FIG. 4B is a cross-sectional view of a main part explaining an ultra-thin portion forming method by press plastic working.

As shown in FIG. 1, first, concave depressions 6 are formed in the sheet-like base material 5 at intervals in the length direction P ₁ and the width direction P ₂ by a roller coining method. As shown in FIG. 2, the depth H and the diameter D of the roller-coined concave depression 6 are:
Arbitrary selection is possible.

As shown in FIG. 3, the formation of the concave depression 6 by the roller coining method is performed by first applying a lengthwise direction to a final temper rolling roller 7 that finishes to a predetermined thickness in a rolling step of manufacturing the sheet-like base material 5. This is performed using a roller 9 opposite to a roller 7 in which a coining bush 8 is embedded at a position corresponding to the interval between P ₁ and the width direction P ₂ . That is, the sheet-like base material 5 pressed and rolled between the roller 7 and the roller 9 opposed to the roller 7 has a length direction P ₁ and a width direction P ₂ shown in FIGS.
Is formed, and a concave depression 6 having required dimensions of a depth H and a diameter D is formed, and then softening annealing is performed.

Then, 4 (a), (b), the mounted sheet-like base member 5 to the press die is forward with P ₁ interval, a coining punch 10 further mold a concave recess 6 And die 11
, An ultra-thin portion 2 is formed.

Thus, by punching out the sheet-like base material 5 on which the ultra-thin portion 2 is formed by a press or the like, an electrode part of the electrode assembly for an electron gun for a cathode ray tube is obtained.

〔The invention's effect〕

The formation of the ultra-thin portion according to the present invention can be achieved easily and with high precision by combining the roller coining method and the press plastic working method, and furthermore, the forming process by the conventional coining method can be simplified. There is an effect that it can be.

In addition, the control of wear and breakage of the press die is reduced, which has the effect of increasing the efficiency of production of electrodes for electron guns and improving characteristics.

[Brief description of the drawings]

FIG. 1 is a perspective view for explaining a method of processing an electrode part of an electrode assembly for an electron gun for a cathode ray tube according to the present invention, and FIG.
FIG. 3 is a sectional view taken along the line A ', FIG. 3 is a side view for explaining a method of forming a concave depression by a roller coining method, and FIGS.
(B) is a fragmentary cross-sectional view illustrating a ultra-thin section forming method by pressing the plastic working method, FIG. 5 is plan view of an example of a conventional in G ₁ electrode or G ₂ electrode, Figure 6 is a fifth diagram B -B 'line sectional view, seventh
Figure is a cross-sectional view of another example of a conventional in G ₁ electrode or G _2. 1 ... Emission electron transmission hole, 2 ... Ultra thin part, 3 ... Ultra thin plate,
4 ... electrode base material, 5 ... sheet-shaped base material, 6 ... concave concave portion, 7, 9 ... roller, 8 ... coining bush, 10 ...
... punch, 11 ... die.

Claims (1)

(57) [Claims] 1. A method of manufacturing an electron gun electrode assembly for a cathode ray tube having a G1 electrode and a G2 electrode sealed in a neck portion of a cathode ray tube, wherein the G1 and G2 electrodes have a circular or rectangular concave shape on a sheet-like base material. The depressions are formed at predetermined intervals by a roller coining method, then softening and annealing are performed, and then the ultra-thin portions are formed by a press plastic pressing method in which the concave depressions are pressed with a punch and a die. A method of manufacturing an electron gun electrode assembly for a cathode ray tube, comprising forming an electron passage hole.