JP2003132784A - Manufacturing method of color cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a color cathode-ray tube, which is addition to suppress the wrinkles and slacks of a color sorting electrode, can also improve the life of a roller electrode. SOLUTION: It has a 1st welding process, in which by making the roller electrode 16 rotating move, the color sorting electrode 13 is welded on a way from a starting point a to one end 11d of a frame, and has a 2nd welding process, in which after making the roller electrode 16 move again to the starting point, by making the roller electrode 16 rotating move, the color sorting electrode 13 is welded on the way from the starting point a to the other end 11e of the frame. The position corresponding to the frame end face 11c of the roller electrode 16 in the 1st welding process differs from the position corresponding to the frame end face 11c of the roller electrode 16 in the last 1st welding process. By this, it can prevent repeating of using only the one restricted part of the roller electrode 16, then the damage of the roller electrode 16 can be stopped, and large improvement in the life of the roller electrode 16 can be aimed at.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a color cathode ray tube used for a television receiver, a computer display and the like.

[0002]

2. Description of the Related Art In recent years, in a color cathode ray tube, flattening of a panel has been promoted because it has the advantages that the range of reflected external light can be reduced and image distortion can be prevented. The color cathode ray tube plays a role of color selection for three electron beams emitted from an electron gun, and a plate-shaped color selection electrode (shadow mask) having a plurality of apertures is fixed to a frame to perform color selection. The electrode structure is formed.

During operation of the cathode ray tube, thermal expansion due to electron beam bombardment displaces the apertures of the color selection electrode, and the electron beam passing through the apertures does not hit the prescribed phosphor correctly, resulting in uneven color. A doming phenomenon occurs. For this reason, a tensile force capable of absorbing thermal expansion due to a temperature rise of the color selection electrode is applied in advance to stretch and hold the color selection electrode on the support.

In the tensioning process for holding the tension, the color selection electrode is welded to the upper surface of the frame, which is the end surface of the frame, with a tensile force applied to the color selection electrode and a compressive force applied to the frame. To do. As a welding method, there is a method using a roller electrode resistance welding machine.

An example of a welding method using a conventional roller electrode resistance welding machine will be described below with reference to FIG.
Each figure of Drawing 9 shows the side view of a welding process. The short-side frame 31 is joined to the long-side frame 30 to form a frame-shaped (in the case of the plan view) frame-shaped frame. In the state shown in the figure, since a compressive force is applied to the side surface of the long side frame 30, the long side frame 30 is curved so as to be convex upward.

When the frame upper surface 30c, which is the upper end surface of the frame, is processed into a curved shape, the frame upper surface 30c is curved even before the compressive force is applied. The radius of curvature changes and the curved shape changes. Even when the long side frame 30 is viewed from above, the frame upper surface 30
c is curved.

FIG. 9A shows a process up to welding one half of the color selection electrode 32. Roller electrode 33
The color selection electrode 32 is welded to the frame upper surface 30c while rotating in the arrow E direction starting from the longitudinal center of the frame upper surface 30c. The roller electrode 33 shown by the chain double-dashed line has moved to the end 32d, and at this point,
Welding of one half of the color selection electrode 32 is completed.

In this state, the roller electrode 33 is moved upward so that the roller electrode 33 is separated from the color selection electrode 32, and the lower end of the roller electrode 16 is located at the frame upper surface 30c.
Move it to the position corresponding to the center of. In FIG. 9B, the roller electrode 33 shown by the solid line is in a state of returning to the central portion. From this state, the roller electrode 33
Is moved to the right end 32e side. Since this movement is performed while welding, the right half of the color selection electrode 32 is welded while the roller electrode 33 rotates and moves in the arrow F direction.

The roller electrode 33 shown by the chain double-dashed line shows the position at the time of completion of welding. From this state, the roller electrode 33 is moved upward and the roller electrode 33 is separated from the color selection electrode 32. Then, the lower end of the roller electrode 33 is moved to a position corresponding to the central portion of the frame upper surface 30c. During this period, the rotation of the roller electrode 33 is stopped. In this state, since the welding is completed, the color selection electrode 32 is cut into a predetermined length, and the color selection electrode assembly which is a joined body of the frame-shaped frame and the color selection electrode 32 is completed.

After the color selection electrode assembly is completed, a new frame-shaped frame and the color selection electrode 32 are set below the roller electrode 33, and a tensile force is applied to the color selection electrode 32 and a long side frame 30 is applied. Is subjected to a compressive force and the welding process described above is repeated. When shifting to a new welding process, the roller electrode 33 is lowered from the state of FIG.
3 is brought into contact with the new color selection electrode 32, and the next welding process is started from this state.

As described above, according to the method of welding the roller electrodes 33 half by half starting from the center, it is possible to suppress wrinkles and slack of the color selection electrode 32 after welding.

[0012]

However, the conventional manufacturing method as described above has the following problems. Since the starting point position of the roller electrode 33 at the start of welding is the central portion of the frame upper surface 30c, the frame upper surface 30c
The welding distance on the right side from the center to the end 32d is the same as the welding distance on the left from the center to the end 32e.
Therefore, the number of revolutions of the roller electrode 33 by welding the right half is the same as the number of revolutions of the roller electrode 33 by welding the left half.

In this case, the rotation directions of the right-side welding and the left-side welding are opposite to each other. Therefore, after the roller electrode 33 has rotated a certain number of times by the left-side welding, the roller electrode 33 is left-side welded by the right-side welding. It will rotate the same number of times as the reverse rotation. Therefore, the upper surface 3 of the frame of the roller electrode 33 in the central portion at the start of welding (the state of FIG. 9A)
0c and the upper surface 30c of the frame of the roller electrode 33 at the time of the start of the next welding (the state where the roller electrode 33 in FIG. 9C is moved downward and brought into contact with the new color selection electrode 32). Is the same as the position corresponding to.

Therefore, every time welding is started on the new color selection electrode 32, the position of the roller electrode 33 corresponding to the frame upper surface 30c becomes the same, and the locus of the position of the roller electrode 33 corresponding to the frame upper surface 30c is also changed. Will be the same. That is, since the same portion of the roller electrode 33 is used every time welding is performed, only a limited portion of the roller electrode 33 is damaged, and welding defects such as spatter due to welding occur. However, there is a problem that the life of the electrode roller electrode is shortened.

The present invention is intended to solve the above-mentioned conventional problems, and in addition to suppressing the wrinkles and slack of the color selection electrode, it can also improve the life of the roller electrode. It aims at providing the manufacturing method of.

[0016]

In order to achieve the above object, the first method of manufacturing a color cathode ray tube according to the present invention is characterized in that the color selection electrode is placed on a frame while the color selection electrode is placed on the frame. A welding step of welding using a roller electrode to a frame end surface is provided, wherein the welding step rotationally moves the roller electrode from a starting point position on the frame end surface, and between the starting point position and one end of the frame. A first welding step of welding the color selection electrode to the frame end surface,
After moving the roller electrode again to the starting point position, the roller electrode is rotationally moved from the starting point position,
A second welding step of welding the color selection electrode to the end surface of the frame between the start point position and the other end of the frame, and the roller at the start point position of the first welding step. It is characterized in that the position corresponding to the frame end face of the electrode is different from the position corresponding to the frame end face of the roller electrode at the starting point position of the immediately preceding first welding step.

According to the method for manufacturing a color cathode ray tube as described above, in addition to suppressing the wrinkles and slack of the color selection electrode, it is possible to prevent repeated use of only a limited part of the roller electrode. The roller electrode is prevented from being damaged, welding defects such as spatter caused by welding can be prevented, and the life of the roller electrode can be significantly improved.

In the first method of manufacturing a color cathode ray tube, the starting point position is a central portion of the frame end surface, and after the second welding step, the roller electrode is rotated and then the frame end surface is rotated. It is preferable to move it to the central part of the above and move to the next first welding step. According to the manufacturing method of the color cathode ray tube as described above, the starting point of the portion used for welding the roller electrode is different every time the first welding process is started due to the rotation of the roller electrode after the second welding process. Can be

Further, it is preferable that the rotation of the roller electrode after the second welding step is performed by moving the roller electrode to the center side of the end face of the frame with the roller electrode being in contact with the color selection electrode. . According to the manufacturing method of the color cathode ray tube as described above, the rotation of the roller electrode after the second welding step can be easily realized without using any special rotating means.

The starting point position is a position deviated from the center of the frame end face, and the welding distance from the starting point position to one end of the frame and the welding distance from the starting point position to the other end of the frame. It is preferable that the welding distance between them is different. According to the manufacturing method of the color cathode ray tube as described above, by shifting the starting point position of welding, the starting point of the portion used for welding the roller electrode can be made different at each start of the first welding process. Since it is possible, no special rotation adjustment is required.

Next, a second method of manufacturing a color cathode ray tube according to the present invention is such that a color selection electrode is placed on a frame,
A welding step of welding the color selection electrode to the frame end surface using a roller electrode, wherein the welding step includes rotating the roller electrode from the starting point position with one end of the frame as a starting point position; A first welding step of welding the color selection electrode to the frame end surface between a start point position and an end point position on the frame end surface; and after moving the roller electrode to the other end of the frame, the roller A second welding step of rotating the electrode from the other end and welding the color selection electrode to the end face of the frame between the other end and the end point position; The position corresponding to the frame end face of the roller electrode at the starting point position of the welding process and the position corresponding to the frame end face of the roller electrode at the starting point position of the immediately preceding first welding process. Characterized in that it comprises.

According to the manufacturing method of the color cathode ray tube as described above, in addition to suppressing the wrinkles and slack of the color selection electrode, it is possible to prevent the limited use of only a limited part of the roller electrode. The roller electrode is prevented from being damaged, welding defects such as spatter caused by welding can be prevented, and the life of the roller electrode can be significantly improved.

In the first method of manufacturing a color cathode ray tube, the end point is the central portion of the end surface of the frame, and after the second welding step, the roller electrode is rotated and then the frame electrode of the frame is rotated. Move it up one end and then
It is preferable to shift to the welding process. According to the manufacturing method of the color cathode ray tube as described above, the starting point of the portion used for welding the roller electrode is different every time the first welding process is started due to the rotation of the roller electrode after the second welding process. Can be

Further, it is preferable that the rotation of the roller electrode after the second welding step is carried out while the roller electrode is in contact with the color selection electrode. According to the manufacturing method of the color cathode ray tube as described above, the rotation of the roller electrode after the second welding step can be easily realized without using any special rotating means.

The end point position is a position deviated from the center of the end face of the frame, and the welding distance from one end of the frame to the end point position and the other end of the frame to the end point position. It is preferable that the welding distance between them is different. According to the manufacturing method of the color cathode ray tube as described above, by shifting the end point position of welding, the start point of the portion used for welding the roller electrode can be changed every time the first welding process is started. Since it is possible, no special rotation adjustment is required.

[0026]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a sectional view of a color cathode ray tube according to an embodiment of the present invention. The color cathode-ray tube 1 shown in this figure has a substantially rectangular face panel 2 having a phosphor screen surface 2a formed on the inner surface thereof.
And a funnel 3 connected behind the face panel 2.
And form an envelope. An electron gun 4 that emits three electron beams is built in the neck portion 3 a of the funnel 3, and the electron beam emitted from the electron gun 4 is generated by a deflection yoke 5 arranged on the outer peripheral surface of the funnel 3. , Is deflected and reaches the screen surface 2a.

Inside the face panel 2, a color selection electrode (shadow mask) 6 provided so as to face the phosphor screen surface 2a is arranged. The color selection electrode 6 plays a role of color selection for the three electron beams emitted from the electron gun 4. A indicates the electron beam trajectory. The color selection electrode structure in which the color selection electrode 6 is joined to the frame 7 is hooked on the panel pin 9 of the face panel 2 by the spring 8 provided in the frame 7.

The steps until the color selection electrode assembly is completed will be described below in the order of manufacturing steps. FIG. 2A shows a perspective view of a frame-shaped frame (corresponding to the frame 7 in FIG. 1). The frame-shaped frame 10 is formed by welding the upper surfaces of the pair of short side frames 12 to the lower surfaces of the pair of long side frames 11.

The long side frame 11 has a plate thickness of 1.4 to 1.8.
It is a press-punched material having a size of about mm that is bent. Further, in order to increase rigidity and ensure a predetermined strength, there is a bent portion 11a having a triangular cross section. Further, the end portion 11b of the bent portion is welded along the longitudinal direction. Like the long-side frame 11, the short-side frame 12 is made by bending a press-punched material having a plate thickness of 1.4 to 1.8 mm. After the frame-shaped frame 10 is completed, in the frame heat treatment step, the frame-shaped frame 10 is heat-treated under a condition of, for example, 550 ° C. or higher for 15 minutes in order to remove processing strain during welding.

Next, in the milling process, the long side frame 1
The frame upper surface 11c (bonding surface of the color selection electrode 13), which is the upper end surface of 1, is cut so that a predetermined radius of curvature is obtained. By the cutting process of this step, the distance between the color selection electrode surface and the phosphor screen surface 2a (FIG. 1) can be set to an appropriate value, and the color shift due to the position shift of the electron beam can be prevented. Further, since the upper surface 11c of the frame is made smooth by the cutting work, the subsequent welding with the color selection electrode becomes easy.

After these steps, the process moves to the stretching step. FIG. 2B shows a perspective view in the stretching step. Here, during the operation of the cathode ray tube, the holes 14 of the color selection electrode 13 are formed by thermal expansion due to the bombardment of the electron beam.
Is displaced, the electron beam passing through the aperture 14 does not hit the predetermined phosphor correctly, and a doming phenomenon occurs in which color unevenness occurs.

For this reason, a tensile force capable of absorbing the thermal expansion of the color selection electrode 13 due to the temperature rise is applied in advance to hold the color selection electrode 13 on the frame-shaped frame 10 in a stretched manner. According to the stretching and holding, the color selection electrode 1
Even if the temperature of 3 rises, it is possible to reduce the misalignment between the openings 14 of the color selection electrode 13 and the phosphor stripes on the phosphor screen surface. In the example of this figure, a tensile force is applied to the color selection electrode 13 in the direction of the arrow A so that the frame-shaped frame 1
A compressive force is applied to 0 in the direction of arrow B.

FIG. 3C shows a perspective view in the welding process. In the state of this figure, the applied state of the tensile force to the color selection electrode 13 and the compressive force to the frame 10 shown in FIG. 2B is maintained. In this step, the color selection electrode 13 is bonded to the long side frame 11 while rotating the roller electrode 16 along the frame upper surface 11c. FIG. 4 is an enlarged view of a main part of FIG. In the embodiment shown in this figure, a roller electrode type resistance welding machine 15 is used for welding.

The roller electrode type resistance welding machine 15 comprises an air cylinder 17 which is a pressurizing means, and a roller electrode 16. By expanding and contracting the shaft 18 from the air cylinder 17, the roller electrode 16 can move up and down, and the roller electrode 16 can press the color selection electrode 13 at a constant pressure. As the pressurizing means, other than the air cylinder using air pressure as shown in the drawing, for example, hydraulic pressure, spring pressure, or gravity utilizing weight can be used.

The roller electrode resistance welding machine 15 is attached to the arm portion (not shown) of the welding robot, and the long side frame 11 can be moved in the longitudinal direction. With the roller electrode 16 pressed against the color selection electrode 13 at a constant pressure,
When the roller electrode 16 is moved in the longitudinal direction of the long side frame 11, the roller electrode 16 moves while rotating on the color selection electrode 13.

FIG. 4B is a plan view for explaining how the roller electrode 16 moves. This figure corresponds to the state of FIG. 4A seen from the upper side, and the illustration of the color selection electrode 13 is omitted. Since a compressive force is applied to the side surface of the long side frame 11, in FIGS. 4A and 4B, the frame upper surface 11c is convex inside (to the facing long side frame 11 side). It is curved. The frame upper surface 11c may be curved so as to be convex outward in advance in anticipation of the bending due to the application of the compressive force, and the frame upper surface 11c is curved so as to be convex outward when the compressive force is applied. In some cases.

For welding, the roller electrode 16 is started at a point a at the center of the frame upper surface 11c, and the left end 11d is formed.
To the side while performing parallel movement on the frame upper surface 11c via the color selection electrode 13. Therefore, the roller electrode 16
Moves in parallel while rotating on the color selection electrode 13. Since the frame upper surface 11c is curved, the locus of the contact portion on the roller electrode 16 with the frame upper surface 11c is a spiral locus displaced while shifting the position of the roller electrode 16 in the axial direction.

FIG. 4C is a diagram specifically showing the locus of the portion of the surface of the roller electrode 16 corresponding to the frame upper surface 11c. When the roller electrode 16 is rotationally moved to the left in the state of FIG. 4B, a locus of a portion of the roller electrode 16 corresponding to the frame upper surface 11c becomes like a line 19. The line 19 forms a spiral locus while moving in the direction of the arrow while shifting the position in the axial direction of the roller electrode 16 (shifting downward in the illustration of FIG. 4C). The point a'is a point corresponding to the point a on the frame upper surface 11c.

The line 20 causes the roller electrode 16 to rotate,
Roller electrode 16 and frame upper surface 1 at the start of welding
1c is a locus when the corresponding position is slightly shifted. The point b'is a point corresponding to the point a on the frame upper surface 11c. The point b ′ is a point where the starting point position is displaced by rotating the roller electrode 16, so that the points a ′ and b ′ are on the same circumference 21. The lines 19 and 20 are respectively spirals, but have different starting points, and therefore pass through different parts of the surface of the roller electrode 16.

FIG. 5 shows side views of the welding process in the order of the processes. FIG. 5A is a diagram showing the first welding step, in which the roller electrode 16 starts from a point a at the center in the longitudinal direction of the frame upper surface 11 c, which is the upper end surface of the frame 11, and ends 11 d. It moves to the side while rotating on the frame upper surface 11c. When the roller electrode 16 reaches the position shown by the chain double-dashed line, the left half of the color selection electrode 13 is welded to the frame upper surface 11c.

From this state, the roller electrode 16 is moved upward, and in the state where the roller electrode 16 is separated from the color selection electrode 13, the lower end of the roller electrode 16 is moved to a position corresponding to the point a. During this period, the rotation of the roller electrode 16 is stopped.

FIG. 5B is a diagram showing the second welding step, in which the roller electrode 16 shown by the solid line has returned to the position of point a. From this state, the roller electrode 16
Is moved to the right end 11e side. This movement is performed while welding while the roller electrode 16 is in contact with the color selection electrode 13, so that the right half of the color selection electrode 13 is welded while the roller electrode 16 rotates in the direction of arrow F. become. The roller electrode 16 shown by the chain double-dashed line shows the state after welding.

In this embodiment, since the starting point position of the roller electrode 16 at the start of welding is the central portion of the frame upper surface 11c, the left half welding distance is the same as the right half welding distance. Therefore, after the roller electrode 16 rotates a fixed number of times by the left welding, the roller electrode 16 rotates reversely by the same number of rotations as the left welding by the right welding. Therefore, the position of the roller electrode 16 shown by the chain double-dashed line in FIG. 5B moves laterally with respect to the position of the roller electrode 16 shown by the solid line in FIG. The positions in the circumferential direction are the same. After the welding is completed, the roller electrode 16 is moved to the central portion side without welding while the roller electrode 16 is in contact with the color selection electrode 13. Therefore, the roller electrode 16 rotates by an amount corresponding to the moving distance. In this case, the movement distance is set so that the circumferential position of the roller electrode 16 is displaced so that the rotational speed is displaced. For example, in the case of a roller diameter of 200 mm, if the moving distance is 20 mm, about 3/100 rotations (0.03 rotations) occur and the reference position also shifts. The roller electrode 16 shown by the solid line in FIG. 5C shows the state after this rotational movement.

Next, from this state, the roller electrode 16 is moved upward, and in a state where the roller electrode 16 is separated from the color selection electrode 13, the lower end of the roller electrode 16 is moved until it corresponds to the point a. During this time, the rotation of the roller electrode 16 is
It has been stopped. In this state, since the welding is completed, the color selection electrode 13 is cut into a predetermined length to form a joined body of the frame-shaped frame 10 and the color selection electrode 13 as shown in FIG. 3D. The color selection electrode structure is completed.

After the color selection electrode assembly is completed, the new frame-shaped frame 10 and the color selection electrode 13 are replaced by the roller electrode 16
, A tensile force is applied to the color selection electrode 13 and a compressive force is applied to the frame frame 10, and the above steps are repeated. When shifting to the new first welding step, the roller electrode 16 is lowered from the state shown by the two-dot chain line in FIG. 5C, and the roller electrode 16 is brought into contact with the new color selection electrode 13. From this state, the next first welding process starts.

Here, since the roller electrode 16 is rotated in advance so that the position in the circumferential direction is displaced, FIG.
The roller electrode 16 in a state where the roller electrode 16 is brought down from the state shown in FIG.
The position corresponding to the frame upper surface 11c of the frame upper surface 11c is the frame upper surface 1 in the preceding first welding step shown in FIG.
It will be different from the position corresponding to 1c.

Therefore, as shown in FIG. 4C, the starting point of the portion of the roller electrode 16 used for welding is different each time the first welding process is started. The locus of the portion used for welding the units varies with each increase in the number of welds. By this,
It is possible to prevent repeated use of a limited part of the roller electrode 16, and it is possible to use a wider area of the surface of the roller electrode 16 for welding.

That is, according to this embodiment, since the color selection electrodes 13 are welded in half on one side, the wrinkles and slack of the color selection electrodes can be suppressed, and the roller electrodes 16 can be prevented from being damaged. It is possible to prevent the occurrence of welding defects such as the generation of spatters, and it is possible to significantly improve the life of the roller electrode 16.

(Embodiment 2) FIG. 6 is a side view showing a welding process according to the embodiment 2 of the present invention in the order of processes. FIG. 6A is a diagram showing the first welding process. The roller electrode 16 rotationally moves from the point b as a starting point to the end 11d side of the long side frame 11. The point b is a point deviated to the end 11d side with respect to the point a at the center in the longitudinal direction of the frame upper surface 11c.

By moving the roller electrode 16 to the end 11d side, the roller electrode 16 moves to the end 11d side while rotating on the frame upper surface 11c. When the roller electrode 16 reaches the position shown by the chain double-dashed line, the color selection electrode 1
3 of the frame upper surface 11c, from the portion corresponding to the point b to the end portion 11d, the frame upper surface 1
It is welded on 1c.

From this state, the roller electrode 16 is moved upward, and in the state where the roller electrode 16 is separated from the color selection electrode 13, the lower end of the roller electrode 16 is moved until it corresponds to the point b. During this period, the rotation of the roller electrode 16 is stopped.

FIG. 6 (b) is a diagram showing the second welding step, in which the roller electrode 16 shown by the solid line is in a state where the roller electrode 16 is lowered and brought into contact with the color selection electrode 13 again. ing. From this state, the roller electrode 16 is moved to the right end 11e side. Since this movement is performed while welding, the roller electrode 16 rotates in the direction of arrow F,
The portion of the color selection electrode 13 corresponding to the point b on the frame upper surface 11c to the portion corresponding to the end portion 11d is welded on the frame upper surface 11c.

Next, from this state, the roller electrode 16 is moved upward, and in a state where the roller electrode 16 is separated from the color selection electrode 13, the lower end of the roller electrode 16 is moved to a position corresponding to the point b. During this period, the rotation of the roller electrode 16 is stopped.

Since welding is completed in this state,
The color selection electrode 13 is cut into a predetermined length to complete a color selection electrode assembly which is a bonded body of the frame-shaped frame 10 and the color selection electrode 13 as shown in FIG. 3D. After the color selection electrode structure is completed, a new frame-shaped frame 10 and color selection electrode 1
3 is set below the roller electrode 16, a tensile force is applied to the color selection electrode 13 and a compressive force is applied to the frame-shaped frame 10, and the above steps are repeated.

When newly shifting to the first welding step,
The roller electrode 16 is lowered from the state shown in FIG. 6C, the roller electrode 16 is brought into contact with the color selection electrode 13, and the next first welding step is started from this state.

Since the point b is displaced from the center point a, the distance between the point b and the end 11d, that is, the welding distance in the first welding step, and the point b and the end 11d. 11e, that is, the welding distance of the second welding step. Therefore, the rotation speed of the roller electrode 16 is different between the first welding process and the second welding process.

Therefore, the position corresponding to the frame upper surface 11c of the roller electrode 16 when the roller electrode 16 is brought into contact with the color selection electrode 13 from the state shown in FIG. 6C is shown in FIG. ), Which is different from the corresponding position in the preceding first welding step shown in FIG. Even in the welding of the second and subsequent units, the number of revolutions of the roller electrode 16 is different between the first welding process and the second welding process, and the roller electrode 16 is not changed every time the first welding process is started. The position corresponding to the frame upper surface 11c will be different.

That is, each time the first welding process is started,
The starting point of the portion of the roller electrode 16 used for welding is different, and as shown in FIG. 4C, the locus of the portion of the roller electrode 16 used for welding one unit is Each time it increases, it will be different. As a result, it is possible to prevent repeated use of a limited part of the roller electrode 16 without providing a special rotation adjusting step, and it is possible to use a wider area of the surface of the roller electrode 16 for welding.

Therefore, similarly to the above-described embodiment, damage to the roller electrode 16 can be suppressed, welding defects such as spatter due to welding can be prevented from occurring, and the life of the roller electrode 16 can be greatly improved. .

Further, in this embodiment, the position of the roller electrode 16 at the start of welding is deviated from the central portion, but the first and second welding steps are provided, and the color selection electrode 16 is welded from two directions. The configuration is similar to that of the embodiment shown in FIG. Therefore, if at least the welding start point position (point b in FIG. 6) is set in the vicinity of the central portion (point a in FIG. 6), the effect of suppressing wrinkles and sagging of the color selection electrode can be obtained. .

(Third Embodiment) FIG. 7 is a side view showing a welding process according to the third embodiment in the order of processes. Figure 7
(A) is a figure showing the 1st welding process, and roller electrode 16 makes point c of one end of frame 11 into a starting point position.
The upper surface 11c of the frame is rotationally moved to the center, which is the end point position. When the roller electrode 16 reaches the position (central portion) indicated by the chain double-dashed line, the left half of the color selection electrode 13 is welded to the frame upper surface 11c.

From this state, the roller electrode 16 is moved upward so that the lower end of the roller electrode 16 is separated from the color selection electrode 13 until the lower end of the roller electrode 16 corresponds to the point d at the other end of the frame 11. To move. During this period, the rotation of the roller electrode 16 is stopped.

FIG. 7B is a diagram showing the second welding step, in which the roller electrode 16 shown by the solid line is moved downward to bring the roller electrode 16 into contact with the color selection electrode 13. Shows the closed state. From this state, the roller electrode 1
6 is moved to the central portion which is the end point position. This movement is performed while welding while the roller electrode 16 is in contact with the color selection electrode 13.
The right half of the color selection electrode 13 is welded while rotating in the direction. Roller electrode 16 shown by a two-dot chain line
Shows the state after welding.

In this embodiment, the position (end point position) of the roller electrode 16 at the completion of welding in the first welding process and at the completion of welding in the second welding process is the central portion of the frame upper surface 11c. Therefore, the welding distance in the left half and the welding distance in the right half are the same.

Therefore, after the roller electrode 16 rotates a certain number of times by the welding on the left side, the roller electrode 16 rotates by the same number of revolutions as the welding on the left side by the welding on the right side. Therefore, the position of the roller electrode 16 shown by the chain double-dashed line in FIG. 7B moves laterally with respect to the position of the roller electrode 16 shown by the solid line in FIG. The positions in the circumferential direction are the same.

After the welding is completed, the roller electrode 16 is moved to the left end side of the roller electrode 16 without welding while the roller electrode 16 is in contact with the color selection electrode 13. Therefore, the roller electrode 16 rotates by an amount corresponding to the moving distance. In this case, the movement distance is set so that the circumferential position of the roller electrode 16 is displaced so that the rotational speed is displaced. For example, in the case of a roller diameter of 200 mm, if the moving distance is 20 mm, about 3/100 rotations (0.03 rotations) occur and the reference position also shifts. The roller electrode 16 shown by the solid line in FIG. 7C shows the state after this rotational movement.

Then, from this state, as shown in FIG. 7C, the roller electrode 16 is moved upward so that the roller electrode 16 is separated from the color selection electrode 13 and the lower end of the roller electrode 16 is moved. Are moved until point corresponds to point c. During this period, the rotation of the roller electrode 16 is stopped. In this state, since the welding is completed, the color selection electrode 13 is cut into a predetermined length to form a joined body of the frame-shaped frame 10 and the color selection electrode 13 as shown in FIG. 3D. The color selection electrode structure is completed.

After the color selection electrode assembly is completed, the new frame-shaped frame 10 and color selection electrode 13 are replaced by the roller electrode 16
, A tensile force is applied to the color selection electrode 13 and a compressive force is applied to the frame frame 10, and the above steps are repeated. When shifting to the new first welding step, the roller electrode 16 is lowered from the state shown by the two-dot chain line in FIG. 7C, and the roller electrode 16 is brought into contact with the new color selection electrode 13. From this state, the next first welding process starts.

Since the roller electrode 16 is rotated in advance so that the position in the circumferential direction is displaced, the roller electrode 16 shown in FIG.
The roller electrode 16 in a state where the roller electrode 16 is brought down from the state shown in FIG.
The position corresponding to the frame upper surface 11c of the frame is the frame upper surface 1 in the preceding first welding step shown in FIG. 7 (a).
It will be different from the position corresponding to 1c.

Therefore, as shown in FIG. 7C, the starting point of the portion of the roller electrode 16 used for welding is different each time the first welding process is started. The locus of the portion used for welding the units varies with each increase in the number of welds. By this,
It is possible to prevent repeated use of a limited part of the roller electrode 16, and it is possible to use a wider area of the surface of the roller electrode 16 for welding.

Here, in this embodiment, the roller electrode 16 is moved to the center of the upper surface 11c of the frame starting from the end and ending at the center to weld one half of the roller electrode 16 at the center. This is different from the configuration of the first embodiment, in which the part is moved to the end point, which is the end point, and welding is performed on one side half. However, the configuration in which the color selection electrodes 16 are welded from two directions is common, and in this embodiment as well, the effect of suppressing wrinkles and sagging of the color selection electrodes can be obtained.

As in this embodiment, the roller electrode 1
When 6 is moved from the end of the frame 11 to the center and welded, wrinkles and sagging may occur at the center of the color selection electrode 16 (center of the screen). However, in the central part of the screen, the allowable range for the deviation of the apertures in the left-right direction is large, so that in the present embodiment, wrinkles and sagging of the color selection electrode, which are practically problematic, can be suppressed.

That is, according to this embodiment, since the color selection electrodes 13 are welded in half on one side, wrinkles and slack of the color selection electrodes can be suppressed, and damage to the roller electrodes 16 can be suppressed. It is possible to prevent the occurrence of welding defects such as the generation of spatters, and it is possible to significantly improve the life of the roller electrode 16.

In the first and third embodiments, the roller electrode 16 is rotated after the second welding step by moving the roller electrode 16 while the roller electrode 16 is in contact with the color selection electrode 13. , The roller electrode 16 to the color selection electrode 13
The roller electrode 16 is separated from the roller electrode 16 by using a separate rotating means.
8 may be rotated (Embodiment 4) FIG. 8 shows a side view of a welding process according to an embodiment of Embodiment 4 in the order of processes. FIG. 8A is a diagram showing the first welding process. The roller electrode 16 starts rotating at a point c at one end of the long side frame 11 and moves to the center side. Similar to the second embodiment, the point b is a point deviated to the point c side with respect to the point a at the center in the longitudinal direction of the frame upper surface 11c.

When the roller electrode 16 reaches the position corresponding to the point b which is the end point position, the point c of the color selection electrode 13 is reached.
The portion from to point b is welded on the frame upper surface 11c.

From this state, the roller electrode 16 is moved upward until the roller electrode 16 is separated from the color selection electrode 13 until the lower end of the roller electrode 16 corresponds to the point d at the other end of the frame 11. To move. During this period, the rotation of the roller electrode 16 is stopped.

FIG. 8 (b) is a diagram showing the second welding step, in which the roller electrode 16 shown by the solid line is in a state where the roller electrode 16 is lowered and brought into contact with the color selection electrode 13 again. ing. From this state, the roller electrode 16 is moved to the position corresponding to the point b which is the end point position. This move is
Since the welding is performed while welding, the roller electrode 16 is rotated in the direction of the arrow E, and from the point d to the point b of the color selection electrode 13.
The parts up to are welded on the frame upper surface 11c.

Then, from this state, as shown in FIG. 8C, the roller electrode 16 is moved upward so that the roller electrode 16 is separated from the color selection electrode 13 and the lower end of the roller electrode 16 is moved. Is moved to a position corresponding to point c. During this period, the rotation of the roller electrode 16 is stopped.

Since welding is completed in this state,
The color selection electrode 13 is cut into a predetermined length to complete a color selection electrode assembly which is a bonded body of the frame-shaped frame 10 and the color selection electrode 13 as shown in FIG. 3D. After the color selection electrode structure is completed, a new frame-shaped frame 10 and color selection electrode 1
3 is set below the roller electrode 16, a tensile force is applied to the color selection electrode 13 and a compressive force is applied to the frame-shaped frame 10, and the above steps are repeated.

When newly shifting to the first welding process,
The roller electrode 16 is lowered from the state shown in FIG. 8C, the roller electrode 16 is brought into contact with the color selection electrode 13, and the next first welding step is started from this state.

Since the point b is displaced from the center point a, the distance between the points c and b, that is, the first point
The welding distance in the welding step of No. 2 and the distance between the point d and the point b, that is, the welding distance in the second welding step will be different. Therefore, the rotation speed of the roller electrode 16 is different between the first welding process and the second welding process.

Therefore, the position corresponding to the point c of the roller electrode 16 in the state in which the roller electrode 16 is brought down from the state shown in FIG. 8C and brought into contact with the color selection electrode 13 is shown in FIG. 8A. This is different from the corresponding position in the preceding first welding step shown in FIG. Even in the welding of the second and subsequent units, the number of revolutions of the roller electrode 16 is different between the first welding process and the second welding process, and the roller electrode 16 is not changed every time the first welding process is started. The position corresponding to point c of will be different.

That is, each time the first welding process is started,
The starting point of the portion of the roller electrode 16 used for welding is different, and as shown in FIG. 4C, the locus of the portion of the roller electrode 16 used for welding one unit is Each time it increases, it will be different. As a result, it is possible to prevent repeated use of a limited part of the roller electrode 16 without providing a special rotation adjusting step, and it is possible to use a wider area of the surface of the roller electrode 16 for welding.

Therefore, similarly to the above-described embodiment, damage to the roller electrode 16 is suppressed, occurrence of welding defects such as spatter due to welding can be prevented, and the life of the roller electrode 16 can be greatly improved. .

Here, in the present embodiment, the point that the roller electrode 16 is moved to the central portion starting from the frame end portion to perform half welding on one side is moved to the end portion starting from the central portion and is half sided. This is different from the configuration of the second embodiment in which welding is performed. However, since the structure in which the color selection electrodes 16 are welded from two directions is common, the end point position of welding (point b in FIG. 8) is the central portion (point a in FIG. 8).
In the present embodiment, the effect of suppressing wrinkles and sagging of the color selection electrode can be obtained by setting it in the vicinity of.

Further, even if wrinkles or slack are generated in the central portion of the color selection electrode 16, it is still useful as an embodiment capable of suppressing wrinkles and slack in the color selection electrode as compared with the third embodiment. It is the same.

[0088]

As described above, according to the present invention, in addition to suppressing the wrinkles and sagging of the color selection electrode, it is possible to prevent repeated use of only a limited part of the roller electrode. It is possible to prevent damage to the electrodes, prevent welding defects such as spatter from occurring due to welding, and significantly improve the life of the roller electrodes.

[Brief description of drawings]

FIG. 1 is a sectional view of a color cathode ray tube according to an embodiment of the present invention.

FIG. 2A is a perspective view of a frame-like frame according to an embodiment of the present invention, and FIG. 2B is a perspective view of a stretching step according to an embodiment of the present invention.

FIG. 3 (c) is a perspective view of a welding process according to an embodiment of the present invention; and (d) is a perspective view of a color selection structure according to an embodiment of the present invention.

FIG. 4A is a perspective view of a main part of a welding process according to an embodiment of the present invention. FIG. 4B is a plan view of a main part of a welding process according to an embodiment of the present invention. The figure which shows the locus | trajectory of the corresponding part of the said roller electrode with the frame upper surface.

5A is a side view of a first welding step according to Embodiment 1 of the present invention, FIG. 5B is a side view of a second welding step according to Embodiment 1 of the present invention, and FIG. 5C is an embodiment of the present invention. 1 is a side view showing a state in which a second welding process according to No. 1 shifts to a next first welding process.

6A is a side view of a first welding step according to Embodiment 2 of the present invention, FIG. 6B is a side view of a second welding step according to Embodiment 2 of the present invention, and FIG. 6C is an embodiment of the present invention. 2 is a side view showing a state of transition from a second welding process according to No. 2 to a next first welding process.

FIG. 7 (a) is a side view of a first welding step according to the third embodiment of the present invention (b) is a side view of a second welding step according to the third embodiment of the present invention (c) an embodiment of the present invention 3 is a side view showing a state of transition from the second welding process according to No. 3 to the next first welding process.

8A is a side view of a first welding step according to Embodiment 4 of the present invention, FIG. 8B is a side view of a second welding step according to Embodiment 4 of the present invention, and FIG. 8C is an embodiment of the present invention. 4 is a side view showing how the second welding process according to No. 4 shifts to the next first welding process. FIG.

FIG. 9 is a side view showing an example of a conventional welding process.

[Explanation of symbols]

10 frame-shaped frame 11 long side frame 12 short side frames 13-color selection electrode 15 Roller electrode resistance welding machine 16 roller electrode

Claims (8)

[Claims] 1. A welding step of welding the color selection electrode to the end face of the frame by using a roller electrode in a state where the color selection electrode is placed on a frame, the welding step comprising: A first welding step of rotatably moving from a starting point position on the frame end surface and welding the color selection electrode to the frame end surface between the starting point position and one end of the frame; After being moved to the position, the roller electrode is rotationally moved from the starting point position,
A second welding step of welding the color selection electrode to the end surface of the frame between the starting point position and the other end of the frame; and the roller at the starting point position of the first welding step. A method of manufacturing a color cathode ray tube, wherein a position corresponding to the frame end face of the electrode is different from a position corresponding to the frame end face of the roller electrode at the starting point position of the immediately preceding first welding step. 2. The starting point position is a central portion of the frame end surface, and after the second welding step, the roller electrode is rotated and then moved to the central portion of the frame end surface to The method of manufacturing a color cathode ray tube according to claim 1, wherein the method proceeds to the first welding step. 3. The rotation of the roller electrode after the second welding step is performed by moving the roller electrode toward the center of the end face of the frame while the roller electrode is in contact with the color selection electrode. A method of manufacturing a color cathode ray tube according to. 4. The starting point position is a position deviated from the center of the end face of the frame, and the welding distance from the starting point position to one end of the frame and the welding distance from the starting point position to the other end of the frame. The method of manufacturing a color cathode ray tube according to claim 1, wherein a welding distance between the two is different. 5. A welding step of welding the color selection electrode to the end face of the frame using a roller electrode in a state where the color selection electrode is placed on a frame, the welding step comprising: Firstly, one end of the frame is used as a starting point position, the frame is rotated from the starting point position, and the color selection electrode is welded to the frame end surface between the starting point position and the ending point position on the frame end surface.
Welding process, and after moving the roller electrode to the other end of the frame,
A second welding step of rotating the roller electrode from the other end and welding the color selection electrode to the frame end face between the other end and the end point position; The position corresponding to the frame end surface of the roller electrode at the starting point position of the first welding step and the position corresponding to the frame end surface of the roller electrode at the starting point position of the preceding first welding step are different. A method for manufacturing a characteristic color cathode ray tube. 6. The end point position is a central portion of the end surface of the frame, and after the second welding step, the roller electrode is rotated, and then moved to one end of the frame to move to the next first position. The method of manufacturing a color cathode ray tube according to claim 5, wherein the welding step is performed. 7. The method of manufacturing a color cathode ray tube according to claim 6, wherein the rotation of the roller electrode after the second welding step is performed while the roller electrode is in contact with the color selection electrode. . 8. The end point position is a position displaced from the center of the end surface of the frame, and the welding distance from one end of the frame to the end point position and the other end of the frame to the end point position. The method for manufacturing a color cathode ray tube according to claim 5, wherein the welding distance between the two is different.