JPH09147759A - Color discriminating electrode structure for color cathode-ray tube, and assembling method and assembling device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfactorily weld and fix a color discriminating mask to a frame regardless of the width of the face where the color discriminating mask is brought into contact with the frame and the width of a welding margin when the thinned color discriminating mask is welded and assembled to the thin and low-rigidity frame. SOLUTION: When a color discriminating mask 1 having the thickness thinner than the conventional 0.1mm is welded and assembled to a low-rigidity frame 2 having the contact face 23 with the width of 4mm or below between the frame Z and the color discriminating mask 1, the color discriminating mask 1 is welded at the outside edge section of the frame contact face 23 or at a chamfer section provided on an edge section. The tip section of a welding electrode to be kept in contact with the color discriminating mask 1 is formed into a linear shape, and the linear shape section of the welding electrode is made longer in length than the contact face between the frame and the color discriminating mask 1. The welding electrode is welded to the face of the color discriminating mask 1 while being inclined outward by the prescribed angle from the vertical direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color selection electrode assembly for a color cathode ray tube, an assembling method thereof and an assembling apparatus thereof.

[0002]

2. Description of the Related Art A color cathode ray tube is provided with a fluorescent screen and a color selection electrode structure having a color selection mechanism for the fluorescent screen, whereby an electron beam is guided on a predetermined fluorescent pattern, and a color image is produced. Is formed.

FIG. 11 shows a general structure of a conventional color selection electrode assembly for a color cathode ray tube. In the figure, a color selection mask 101 has a plurality of strip grids 110 formed by selectively etching a thin metal plate, and is fixed to a pair of support members 121 at a joint 111 of a contact surface 123 with a support member 121. The frame 102 is composed of a pair of support members 121 and a pair of elastic members 122 that connect the pair of support members 121 to each other and have elasticity. In addition, a support structure 103 whose one end is fixed to the frame 102
Has a fitting hole 311 at its other end for engaging with a pin (not shown) provided in the glass container of the color cathode ray tube. Further, the damper wire 104, which is given a predetermined tension from the damper spring 105, is arranged so as to be in contact with the color selection mask 101, and acts so as to damp the vibration of the color selection mask 101.

Next, a method of assembling a conventional color selection electrode assembly for a color cathode ray tube will be described. FIG. 12 is a diagram showing a process of setting the color selection mask 101 on the color selection electrode assembly for a color cathode ray tube. The color selection mask 101 is a flat mask composed of a portion having a plurality of strip grids 110 and a peripheral portion 112 without the plurality of strip grids 110. The flat color selection mask 101 is arranged and set on a frame 102 having a turnbuckle (arrow a), and then the frame 102 is attached to the flat color selection mask 101 (arrow b). ) Do. As a result, the flat color selection mask 101 and the frame 102 are brought into close contact with each other. FIG. 13 is a diagram showing a process of welding the flat color selection mask 101 and the frame 102. By rolling the roller-shaped welding electrode 106 on the support member 121, the support member 121 and the color selection mask 101 are welded and fixed inside the surface 123 in contact with each other. The welding is performed on both the pair of support members 121. After welding, the turnbuckle of the frame 102 is released and the elastic force of the frame 102 causes the color selection mask 101.
Is held stretched.

The welding electrode 106, the color selection mask 101, and the support member 12 when the color selection mask 101 and the frame 102 are fixed by welding.
The positional relationship with 1 is shown in FIG. FIG. 14 is a partially enlarged view of FIG. Further, FIG. 15 is a schematic cross-sectional view taken along the line BB ′ in FIG. The frame 102 is required to have elasticity and rigidity in order to secure the tension of the color selection mask 101, and for example, a metal material having high yield strength is used. The support member 121 is generally a bent one after drawing or a press-molded flat plate is used, but in order to secure sufficient tension in the color selection mask 101,
It is necessary to secure the width dimension of the cross-sectional shape, that is, the dimension b in FIG. That is, the width of the contact surface 123 is 4 mm
The above is secured. The turnbuckle amount of the frame 102 is generally a method of adding a predetermined displacement amount based on the outer shape of the frame 102 or a method of applying a predetermined pressing force to the frame 102. When the position of the supporting member 121 is displaced as shown by the wavy line in FIG. 15, the positional relationship between the contact surface 123 and the welding electrode 106 is also displaced. Further, the welding electrode 106 is attached to the supporting member 121.
The movement locus for moving and welding and fixing the robot is such that the basic shape of the frame 102 is memorized by a robot or the like, but in this case also, the contact surface 123 due to the difference between the frame 102 and the basic shape. Therefore, the positional relationship between the welding electrode 106 and the welding electrode 106 is displaced. When assembled by such a method, the displacement between the contact surface 123 and the welding electrode 106 is about ± 2 mm at maximum. However, at present, the width of the contact surface 123 is 4 mm.
Since the above is ensured, the welding electrode 106 can weld and fix the color selection mask 101 and the frame 102 without falling off from the contact surface 123.

[0006]

The color selection mask 101 is stretched and held at a predetermined stress by the elastic force of the frame 102, and the stress and tension applied to the color selection mask 101 are expressed by the following equation (1).
There is such a relationship. σ = T / S (1) where σ is the stress applied to the color selection mask 1, T is the tension applied to the color selection mask 101, and S is the cross-sectional area of the color selection mask 101. Show. That is, when a predetermined stress is obtained in the color selection mask 101, if the cross-sectional area of the color selection mask 101 becomes small,
That is, the thinner the color selection mask 101 is, the less tension is required. Also, if the required tension is reduced, the frame 10
Since the elastic force of 2 is also small, the rigidity required for the frame 102 is reduced, the weight can be reduced, and the cost can be reduced. On the other hand, the present inventors have already filed Japanese Patent Application No. 6-2.
No. 60299 discloses a technique for realizing a thin plate of a color selection mask 101 having a plate thickness of 0.1 mm which is generally used at present.

In this case, if the rigidity required for the frame 102 is reduced, the cross-sectional area of the support member 121 of the frame 102 is reduced, and the length of the contact surface 123 with the color selection mask 101 is 4 m.
m or less. Therefore, in the conventional welding method described above,
Since the positioning variation between the contact surface 123 of the frame 102 with the color selection mask 101 and the welding electrode 106 is large, there is a problem that the welding electrode 106 falls off the supporting member 121 of the frame 102 and welding failure occurs. As measures against this, it is conceivable to improve the frame dimensional accuracy and increase the accuracy of the manufacturing apparatus, but such a method causes a problem that the component cost and the manufacturing cost increase significantly.

The present invention has been made in order to solve the above-mentioned problems, and in order to reduce the cost of the color selection electrode assembly for a color cathode ray tube, the color selection mask is made thin and the frame is made lighter. Even if the width of the contact surface with the color selection mask becomes smaller, it is possible to satisfactorily weld and fix the color selection mask and frame without dropping the welding electrode from the frame using the parts and manufacturing equipment of the current accuracy. It is an object of the present invention to provide a color selection electrode assembly for a color cathode ray tube, an assembling method thereof and an assembling apparatus thereof.

[0009]

A first aspect of the present invention.
The color selection electrode assembly for a color cathode ray tube of 1) has a thin plate-shaped color selection mask having a plurality of strip grids, and an elastic frame for stretching the color selection mask to apply a predetermined tension to the color selection mask. Is a color selection electrode assembly for a color cathode ray tube joined at an end of the frame, the frame having a contact surface with a width of 4 mm or less for contacting the color selection mask, and the frame and the color selection mask. Of the contact surface is on the outer edge portion of the contact surface.

According to a second aspect of the present invention, there is provided a color selection electrode structure for a color cathode ray tube according to the first aspect, wherein an outer edge portion of a contact surface of the frame with the color selection mask has a chamfered portion. It is defined that the chamfered portion has a joint portion with the selection mask.

According to a third aspect of the present invention, there is provided a color cathode ray tube color selection electrode assembly according to the second aspect, wherein a chamfered portion provided on an outer edge portion of a contact surface of the frame with the color selection mask has a width of 2 mm or less. It stipulates that there is.

According to a fourth aspect of the present invention, in the method for assembling a color selection electrode assembly for a color cathode ray tube, a thin plate-shaped color selection mask having a plurality of strip grids is stretched over an elastic frame to form a frame of the frame. Outside of the contact surface by a step of closely contacting with the contact surface having a width of 4 mm or less that contacts the color selection mask and a welding electrode inclined outward of the frame with respect to the contact surface of the frame that contacts the color selection mask. And a step of welding the frame and the color selection mask at an edge portion.

According to a fifth aspect of the present invention, there is provided an apparatus for assembling a color selection electrode assembly for a color cathode ray tube, comprising: a thin plate-shaped color selection mask having a plurality of strip grids; An apparatus for assembling a color selection electrode assembly for a color cathode ray tube, comprising: a welding electrode that joins a frame having elasticity for applying a predetermined tension to a surface of the frame along a contact surface with the color selection mask. The cross-section of the tip of the welding electrode, which comes into contact with the frame via the color selection mask during welding, with respect to the joining direction is linear.

According to a sixth aspect of the present invention, in the apparatus for assembling a color selection electrode assembly for a color cathode ray tube according to the fifth aspect, the length of the linear portion of the cross section with respect to the joining direction of the tip of the welding electrode is the color selection. It defines that the contact surface of the mask is longer than the length in the cross section in the bonding direction.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of a color selection electrode assembly for a color cathode ray tube used in, for example, a 21-inch display monitor showing an embodiment of the present invention. FIG. 2 is a sectional side view taken along the line AA ′ in FIG. Here, the color selection mask 1 made of a thin metal plate is disclosed in Japanese Patent Application No. 6-260299.
As described in No. 0, the plate thickness is less than 0.1 mm,
The one with 025 mm was used. It also has a strip grid 10 with a pitch of 0.30 mm formed by etching. The frame 2 is constructed by welding a support member 21 and an elastic member 22 each of which is bent after being drawn, and at this time, the width of the contact surface 21 of the support member 21 with the color selection mask 1 is about 3 mm. Is. Further, a damper wire 4 arranged so as to contact the color selection mask 1 to damp the vibration of the color selection mask 1, a damper spring 5 having a predetermined tension on the damper wire 5, and a support having a fitting hole 31 for supporting the color selection electrode assembly It is composed of the structure 3. Reference numeral 11 denotes a joint portion of the color selection mask 1 with the frame 2.

When the thin plate color selection mask 1 and the frame 2 having a narrow contact surface 23 are joined, the contact surface 23 is parallel to the color selection mask 1 even if the frame 2 is deviated from its basic shape. And the color selection mask 1 and the contact surface 23 are in contact with each other at least at the outer edge portion. Contact surface 2
If the outer edge portion 24 of 3 is welded and fixed, the color selection mask 1 and the frame 2 are fixed and welded at a good position where the contact state is always in close contact, so that the welding strength does not deteriorate and is fixed with uniform welding strength. Like Therefore, it is possible to perform good welding and fixing to the color selection mask which is thinner than the conventional one and to the frame which has low rigidity and is lightened accordingly.

Next, a specific welding method for the outer edge portion 24 of the contact surface 23 will be described. FIG. 3 shows a color selection mask 1
It is a figure explaining the method of welding the contact surface 23 and the outer surface edge part. The color selection mask 1 is pressed against the support member 21 and is in contact therewith. Conventional plate thickness 0.1
In the case of the color selection mask 1 having a size of about mm, when the color selection mask 1 is pressed against the support member 21, a gap is formed between the support member 21 and the color selection mask 1 due to the rigidity of the color selection mask 1 itself, resulting in poor adhesion. However, the contact surface 2 of the color selection mask 1 with the thin color selection mask 1 having a plate thickness of 0.025 mm and the support member 21
When the width 3 is 3 mm, the adhesion with the color selection mask 1 is good. The color selection mask 1 is welded and fixed at the outer edge portion 24 of the contact surface 23 with the frame 2. At this time, as shown in the figure, the welding electrode 6 is inclined outward from the direction perpendicular to the color selection mask surface to the outside at a predetermined angle from the direction perpendicular to the outer surface, and the outer edge portion is welded, so that the adhesiveness is originally improved. The color selection mask 1 and the support member 21 that are in good contact with each other
The edges of and can be reliably joined with high quality. Further, by inclining the welding electrode 6, a voltage is surely applied between the edge portion and the electrode during welding.

When the joining is completed, the peripheral portion 12 of the color selection mask 1 is removed in a post process.

Second Embodiment Hereinafter, the second embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a part of a schematic view of a color selection electrode structure for a color cathode ray tube used for a 21-inch display monitor, for example, and in FIG. 2 of the first embodiment, the surface of the support member 21 of the frame which is in contact with the color selection mask 1. A chamfer 25 is provided on the outer edge of 23. The chamfered portion 25 has a width of 1.0 mm, and the color selection mask 1 is welded and fixed at the chamfered portion 25.

Next, a method of welding to a frame having a chamfer will be described. FIG. 5 is a diagram illustrating a method of welding the color selection mask 1 and the chamfered portion 25 of the contact surface 23. In the figure, the color selection mask 1 is pressed against the support member 21 and is in contact with the frame. In the conventional color selection mask 1 having a plate thickness of about 0.1 mm, when the color selection mask 1 is pressed against the support member 21, the rigidity of the color selection mask 1 itself causes a gap between the support member 21 and the color selection mask 1. The adhesion is poor. However, the plate thickness is 0.02
In the combination of the thin color selection mask 1 of 5 mm and the support member 21 in which the contact surface 211 width of the color selection mask 1 is 3 mm, the adhesion with the color selection mask 1 is good. The color selection mask 1 is welded and fixed at a chamfered portion 25 provided outside the contact surface 23 with the frame 2. At that time, the welding electrode 6 is tilted outward at a predetermined angle from the direction perpendicular to the surface of the color selection mask to the direction perpendicular to the outer surface. As described in the first embodiment, since the color selection mask 1 and the frame 2 are surely brought into close contact with each other at the outer edge portion of the contact surface, the chamfered portion of the outer edge portion ensures the reliability of the joining. The same is true of improved sex. Further, in the first embodiment having no chamfered portion, although the voltage is surely applied at the edge portion of the electrode and the frame during welding, current concentration may occur at the edge portion and the welding quality may be deteriorated. Embodiment 2
When the chamfered portion is provided as described above, current concentration can be avoided, wear of the electrode can be suppressed, and welding reliability is further improved.

Next, the relationship between the width of the chamfered portion provided on the outer edge portion of the frame 2 and the reliability of joining was verified as follows. The frame 2 used for the verification has a shape as shown in FIG. 4, which is manufactured by integrally molding from an original plate by pressing. At this time, the width of the contact surface 23 was 3 mm, and the welding condition was verified by changing the width of the chamfered portion with respect to the contact surface width of 3 mm. Color selection mask 1 as the width of the chamfer increases
The contact state between the chamfered portion 25 and the chamfered portion 25 deteriorates, and the color selection mask 1 is in a state of floating with respect to the chamfered portion 25. Therefore, the contact state between the welding electrode 6, the color selection mask 1 and the frame 2 is deteriorated, and the welding current is shunted to cause welding failure. A predetermined stress is applied to the color selection mask 1 by the elastic force of the frame 2, but since the stress is actually supported at the welding location, defective welding leads to deterioration of the welding strength, which may occur during the assembly process. When the turnbuckle is released, it peels off from the weld, which is a problem.
The results of this verification are shown in Table 1.

[0022]

[Table 1]

In Table 1, the welding condition ◯ indicates that the adhesion strength by welding is sufficiently secured, the welding condition Δ indicates that the adhesion strength by welding is small, and some peeling occurs, and the welding condition × indicates the adhesion strength by welding. The case where it is judged to be almost small and welding failure is shown. When the width of the chamfered portion 25 is 2.0 mm or more with respect to the width of the contact surface 23 of 3 mm, the welding strength of the color selection mask 1 and the frame 2 due to welding is small, and deterioration of the welding strength that is easily peeled off was observed. Chamfer is 2m
It has been found that a value of about m or less is preferable.

In the above-described embodiment, the relationship between the width of the chamfered portion and the reliability of bonding is shown as the verification result for the contact surface width of 3 mm.
It was found that even in the case of mm, it is almost the same, and if it is about 2 mm or less, a good welded state can be obtained. Also,
When the contact surface width is 3 mm or less, the chamfer width is 2 mm in order to ensure sufficient contact between the color selection mask 1 and the frame 2.
It goes without saying that you need to do the following:

Embodiment 3. Another embodiment of the present invention will be described with reference to the drawings. Similar to FIG. 3, FIG. 6 is a diagram for explaining a method of welding the color selection mask 1 and the contact surface 23 at the outer edge portion, and is a cross-sectional view orthogonal to the welding direction. In the figure, the color selection mask 1 is in contact with the support member 21 while being pressed down. In the conventional color selection mask 1 having a plate thickness of about 0.1 mm, when pressed against the support member 21, the rigidity of the color selection mask 1 itself creates a gap between the support member 21 and the color selection mask 1, resulting in poor adhesion. On the other hand, a thin color selection mask with a plate thickness of 0.025 mm 1
Then, the adhesion with the support member 21 is good. Welding electrode 6
At the tip, the cross section perpendicular to the welding direction is linear at a contact portion 62 including a portion 61 that contacts the frame 2 via the color selection mask 1. The length a of the contact surface line of the welding electrode 6 is 6 mm, and the sectional length b of the contact surface 23 of the frame 2 and the color selection mask 1 is 3 mm at right angles to the welding direction.
Therefore, a> b. Thus, the tip of the welding electrode 6 has a linear shape with respect to the welding direction, and its length is
If the cross-sectional length of the contact surface 23 of the frame is sufficiently larger, even if the trajectory of the welding electrode 6 is deviated, a constant contact area can always be maintained between the color selection mask 1 and the support member 21, and good welding can be performed.

In the above embodiment, an example in which the cross-sectional shape of the welding electrode was rectangular was shown, but the tip of the welding electrode 6 is linear in the welding direction and its length is If the condition that it is sufficiently larger than the cross-sectional length of the contact surface 23 of the frame is satisfied, there is no need to stick to other rectangles.
For example, a convex shape or a trapezoidal shape as shown in FIGS.

In the above-described embodiment, the relationship between the welding electrode and the shape of the tip of the welding electrode for welding to the edge portion corresponding to the first embodiment has been shown. However, as shown in FIG. It goes without saying that the present invention can be applied even in the case of having a chamfer corresponding to the form 2. That is,
The electrodes of FIGS. 7 and 8 can be used as the welding electrode 6 of FIG.

Fourth Embodiment In the above-described first to third embodiments, an example in which the frame of the color selection electrode assembly for a color cathode ray tube is composed of the supporting member 21 and the elastic member 22 has been shown, but the supporting member 21 and the elastic member 22 are integrated. It may be This example will be described with reference to FIG. FIG. 10 is a schematic view of a color selection electrode assembly for a color cathode ray tube used in a 21-inch display monitor showing an embodiment of the present invention. The plate thickness of the color selection mask 1 is thinner than the conventional one, for example, 0.025 mm. The frame 2 is integrally formed by pressing from an original plate having a plate thickness of 3 mm, and the width of the contact surface 23 of the frame 2 with the color selection mask 1 is 3 mm. The contact surface 23 is kept parallel to the color selection mask 1, and the color selection mask 1 is welded and fixed at the outer edge of the contact surface. It is possible to satisfactorily weld and fix the lighter color selection mask to the frame integrally formed in this way as compared with the conventional case.

[0029]

As described above, according to the present invention, even if the width of the contact surface where the color selection mask and the frame come into contact with each other becomes small, the welding electrode is detached from the frame with the current precision parts and manufacturing apparatus. It is possible to satisfactorily weld without the need to do so, and with the thinning of the color selection mask, it becomes possible to introduce it even with a thin frame with low rigidity, thus reducing weight and cost. Is possible.

[Brief description of the drawings]

FIG. 1 is a color selection electrode assembly for a color cathode ray tube according to a first embodiment of the present invention.

FIG. 2 is a schematic view showing a joint between a color selection mask and a frame in the schematic cross-sectional view taken along the line AA ′ of FIG.

FIG. 3 is a schematic view showing a positional relationship between a frame, a color selection mask and a welding electrode in the method for assembling a color selection electrode assembly for a color cathode ray tube according to the present invention.

FIG. 4 is a schematic view showing a joint portion between a frame having a chamfered portion and a color selection mask in the color selection electrode assembly for a color cathode ray tube according to the second embodiment of the present invention.

FIG. 5 is a schematic view showing a positional relationship between a frame having a chamfered portion, a color selection mask and a welding electrode in the method of assembling the color selection electrode assembly for a color cathode ray tube according to the second embodiment of the present invention.

FIG. 6 is a view showing a method of assembling a color selection electrode assembly for a color cathode ray tube according to a third embodiment of the present invention, in which a welding electrode during welding,
It is sectional drawing with respect to the welding direction which showed one relationship of a frame and a color selection mask.

FIG. 7 is a diagram showing a method of assembling a color selection electrode assembly for a color cathode ray tube according to a third embodiment of the present invention, in which a welding electrode during welding,
FIG. 3 is a cross-sectional view showing a relationship between a frame and a color selection mask with respect to a welding direction, and is a schematic view showing a cross-sectional shape of a welding electrode having a trapezoidal tip.

FIG. 8 is a diagram showing a method of assembling a color selection electrode assembly for a color cathode ray tube according to a third embodiment of the present invention.
FIG. 3 is a cross-sectional view showing a relationship between a frame and a color selection mask with respect to a welding direction, and a schematic view showing a cross-sectional shape of a welding electrode having a convex tip.

FIG. 9 is a diagram showing a method of assembling a color selection electrode assembly for a color cathode ray tube according to a third embodiment of the present invention, in which a welding electrode during welding,
FIG. 6 is a cross-sectional view in the welding direction showing a relationship between a frame having a chamfered portion and a color selection mask.

FIG. 10 is an explanatory diagram of a color selection electrode assembly for a color cathode ray tube according to Embodiment 4 of the present invention, which has an integral frame.

FIG. 11 is a schematic view showing a conventional color selection electrode assembly for a color cathode ray tube.

FIG. 12 is a diagram showing a part of an assembling process of a conventional color selection electrode assembly for a color cathode ray tube.

FIG. 13 is a schematic view of a welding assembly process of a conventional color selection electrode assembly for a color cathode ray tube.

FIG. 14 is a schematic view of a welding assembly process of a conventional color selection electrode assembly for a color cathode ray tube, showing a positional relationship between a color selection mask, a frame and a welding electrode.

FIG. 15 is a schematic view of a B-B ′ cross section in FIG. 14.

[Explanation of symbols]

1 color selection mask, 2 frame, 3 support structure, 4 damper wire, 5 damper spring,
6 welding electrodes, 10 strips, 11 color selection mask welds, 12 color selection mask periphery, 21
Support member, 22 elastic member, 23 contact surface of the frame with the color selection mask, 24 outer edge portion of the contact surface,
25 chamfered portion, 31 fitting hole, 61 location where welding electrode contacts color selection mask, 62 tip including location where welding electrode contacts color selection mask

Claims (6)

[Claims] 1. A thin plate-shaped color selection mask having a plurality of strip grids, and a frame having elasticity to stretch the color selection mask and apply a predetermined tension to the color selection mask. A color selection electrode structure for a color cathode ray tube joined at ends, wherein the frame has a contact surface with a width of 4 mm or less for contacting the color selection mask, and a joint portion between the frame and the color selection mask is A color selection electrode assembly for a color cathode ray tube, which is located on an outer edge portion of a contact surface. 2. The outer edge portion of the contact surface of the frame with the color selection mask has a chamfered portion, and the joint portion between the frame and the color selection mask is in the chamfered portion. A color selection electrode assembly for a color cathode ray tube as described in. 3. The color selection electrode assembly for a color cathode ray tube according to claim 2, wherein the width of the chamfered portion provided on the outer edge portion of the contact surface of the frame with the color selection mask is 2 mm or less. 4. A step of laying a thin plate-shaped color selection mask having a plurality of fine grids on an elastic frame and closely contacting a contact surface of the frame with a width of 4 mm or less, which is in contact with the color selection mask. Welding the frame and the color selection mask at an outer edge portion of the contact surface with a welding electrode inclined outwardly of the frame with respect to a contact surface of the frame that contacts the color selection mask. For assembling a color selection electrode assembly for a color cathode ray tube. 5. A thin plate-shaped color selection mask having a plurality of fine grids, and a frame which is stretched over the color selection mask and has elasticity for applying a predetermined tension to the color selection mask, the frame end. A color selection electrode assembly assembly device for a color cathode ray tube comprising a welding electrode joined along a contact surface with a color selection mask of a portion, the welding electrode being in contact with the frame through the color selection mask during welding. An apparatus for assembling a color selection electrode structure for a color cathode line, wherein a cross section of a front end portion of the above is linear in a bonding direction. 6. The length of the straight-shaped portion of the cross section of the tip of the welding electrode in the joining direction is longer than the length of the contact surface of the color selection mask in the cross section of the joining surface in the joining direction. A device for assembling a color selection electrode assembly for a color cathode ray tube as described.