JP2004319185A - Manufacturing method of color cathode-ray tube, and color cathode-ray tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a color cathode-ray tube provided with a color selection electrode hardly causing torsion. <P>SOLUTION: This manufacturing method of a color cathode-ray tube includes: a process for fixing a pair of first frames 9 arranged with a predetermined space for supporting a shadow mask so as to compose quadrangular frames at both ends of a pair of second frames 10 arranged along a direction intersecting with the lengthwise direction of the first frames 9; and a process for tilting the second frames 10 with the first frames 9 fixed by a predetermined tilt angle with respect to the horizontal direction and for welding and fixing the first frames 9 to the second frames 10 while supplying a welding metal 21 between the tilted second frames 10 and the first frames 9. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing a color cathode ray tube, and more particularly, to a method for manufacturing a frame supporting a shadow mask constituting the color cathode ray tube.
[0002]
[Prior art]
FIG. 9 is a perspective view showing a color selection mechanism provided in a conventional color cathode ray tube. As shown in FIG. 9, a conventional color selection mechanism for a color cathode ray tube includes a shadow mask 101, a pair of first frames 102 supporting the shadow mask 101, and another pair supporting the pair of first frames 102. (See, for example, Patent Document 1).
[0003]
Generally, the first frame 102 and the second frame 103 are integrated into a frame shape by welding to form the frame 104, and thereafter, the frame 104 is subjected to a blackening process. Further, after the side surface of the first frame 102 is pressed to deform the frame 104, the shadow mask 101 is stretched along the R surface of the first frame 102, and the shadow mask 101 is fixed to the frame 104 by welding. By releasing the force applied to the frame 104, tension is applied to the shadow mask 101 to complete the color selection mechanism of the color cathode ray tube.
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2001-176420
[Problems to be solved by the invention]
However, according to the above-described related art, since a large force is applied to the frame 104 to apply tension to the shadow mask 101, the color selection mechanism after the shadow mask 101 is fixed by welding is twisted. As a result, the R surface of the color selection mechanism cannot maintain a predetermined shape, and as a result, there is a problem that it is difficult to guarantee the color purity of the color cathode ray tube.
[0006]
An object of the present invention is to provide a method for manufacturing a color cathode ray tube provided with a color selection electrode with less twist, and a color cathode ray tube manufactured using the color cathode ray tube and having excellent color purity.
[0007]
[Means for Solving the Problems]
A method of manufacturing a color cathode ray tube according to the present invention includes a shadow mask having a rectangular plate shape, a pair of first frames supporting the shadow mask, and a pair of second frames supporting the first frame. A method of manufacturing a color cathode ray tube, comprising: a pair of first frames arranged at a predetermined interval to support the shadow mask, the pair of first frames being arranged along a direction crossing a longitudinal direction of the first frames. Fixing both ends of the pair of second frames arranged so as to form a rectangular frame, and tilting the second frame to which the first frame is fixed at a predetermined inclination angle with respect to the horizontal direction. And fixing the first frame to the second frame by welding while supplying a weld metal between the tilted second frame and the first frame. And it features.
[0008]
A color cathode ray tube according to the present invention includes a shadow mask having a rectangular plate shape, a pair of first frames supporting the shadow mask, and a pair of second frames supporting the first frame. The pair of first frames arranged at a predetermined interval to support the shadow mask, the pair of first frames arranged along a direction intersecting the longitudinal direction of the first frame. Fixing both sides of the second frame so as to form a square frame, and tilting the second frame to which the first frame is fixed by a predetermined tilt angle with respect to the horizontal direction, Welding the first frame to the second frame while supplying a weld metal between the second frame and the first frame. It is characterized in.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
In the method for manufacturing a color cathode ray tube according to the present embodiment, the second frame to which the first frame is fixed is tilted by a predetermined tilt angle with respect to the horizontal direction, and the second frame and the first frame are tilted. The first frame is welded and fixed to the second frame while supplying the weld metal therebetween. Therefore, it is possible to stably weld the first frame to the second frame without causing a variation in strength in a welded portion between the first frame and the second frame. As a result, in the color selection electrode after the shadow mask is stretched, the variation in twist can be reduced.
[0010]
In this embodiment, it is preferable that the inclination angle is not less than 20 degrees and not more than 70 degrees.
[0011]
Preferably, the inclination angle is 30 degrees or more and 60 degrees or less.
[0012]
The color cathode ray tube according to the present embodiment is such that the second frame to which the first frame is fixed is inclined by a predetermined inclination angle with respect to the horizontal direction, and a weld metal is provided between the inclined second frame and the first frame. While the first frame is welded and fixed to the second frame. For this reason, the first frame is fixedly welded to the second frame stably without causing variation in strength at the welded portion between the first frame and the second frame. As a result, in the color selection electrode after the shadow mask is stretched, the variation in twist can be reduced.
[0013]
In this embodiment, it is preferable that the inclination angle is not less than 20 degrees and not more than 70 degrees.
[0014]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0015]
FIG. 1 is a partially cutaway sectional view showing a configuration of a color cathode ray tube 1 according to the present embodiment. As shown in FIG. 1, a color cathode ray tube 1 according to the present embodiment includes an envelope including a panel 2 and a funnel 3. On the inner surface of the panel 2, a phosphor screen 4 to which blue, green, and red phosphors are applied is formed. An electron gun 6 is housed in a neck portion 5 provided in the funnel 3. Further, a color selection mechanism 7 is arranged so as to face the phosphor screen 4.
[0016]
FIG. 2 is a perspective view showing the appearance of a color selection mechanism 7 provided in the color cathode ray tube 1 according to the present embodiment. The color selection mechanism 7 includes a shadow mask 8, a pair of first frames 9 for supporting the shadow mask 8, and a pair of second frames 10 for supporting the pair of first frames 9.
[0017]
FIG. 3 is a perspective view illustrating an appearance of the first frame 9 provided in the color selection mechanism 7. The first frame 9 includes a side surface 11, a bottom surface 12, an inclined portion 13, and a welded portion 14 that support the shadow mask 8 at the ends thereof. The first frame 9 is configured such that its cross-sectional shape is substantially triangular by the side surface portion 11, the bottom surface portion 12, and the inclined portion 13. 14 and the side part 11 are connected by welding. The end of the side surface portion 11 on which the shadow mask 8 is stretched forms an arcuate R surface along the longitudinal direction of the first frame 9.
[0018]
The material forming the first frame 9 needs high rigidity to support the shadow mask 8 in a stretched manner. Therefore, press forming is difficult, and the bottom portion 12 and the bent portion 15 of the inclined portion 13 cannot be formed at an acute angle, and thus have to be formed into an R shape. In the present embodiment, when high-tensile steel is used as the material of the first frame 9, the outside of the bent portion 15 is set to 3R in order to press-form without cracking.
[0019]
FIG. 4 is a perspective view showing an assembled state of the first frame 9 and the second frame 10 provided in the color selection mechanism 7 of the color cathode ray tube 1 according to the present embodiment. The frame 16 of the color cathode ray tube according to the present embodiment is configured such that another pair of first frames 9 is welded and fixed to upper ends of a pair of second frames 10 so as to form a frame.
[0020]
Next, a method for welding the frame of the color cathode ray tube according to the present embodiment will be described. FIG. 5 is a perspective view for explaining a method of welding the first frame 9 and the second frame 10 provided in the color selection mechanism 7 of the color cathode ray tube 1 according to the present embodiment, and FIG. FIG. 4 is a cross-sectional view for explaining a method of welding a first frame 9 and a second frame 10 provided in a mechanism 7.
[0021]
First, a pair of first frames 9 is placed on the upper ends of the pair of second frames 10 so as to form a frame, and then fixed with a jig so as not to move. Next, as shown in FIG. 5, the entire frame 16 is tilted around the X axis. In the present embodiment, the inclination angle of the frame 16 is 40 ° with respect to the horizontal direction.
[0022]
Subsequently, as shown in FIG. 6, first, for one of the corners 17 on the lower side, the bent portion 15 of the first frame 9 and the upper portion of the second frame 10 are moved between the bent portion 15 and the second frame 10. Is fixed by TIG welding while supplying the welding metal 21 to the metal.
[0023]
In the present embodiment, JIS-YG1CMA (Fe-1.3% Ni-0.6% Mo) having a wire diameter of 1.2 mm is used as the welding metal 21. The welding speed was 250 millimeters (mm) / min, the welding current was 140 amps (A), and the supply speed of the deposited metal 21 was 1.2 meters (m) / min. At this time, the supply amount of the deposited metal 21 is 43 g (g) per 1 mm (mm) of welding length, when the specific gravity is calculated as 7.9 g (g) / cm ³ .
[0024]
Next, the entire frame 16 is inclined by 40 ° around the X axis in the opposite direction. Then, the bent portion 15 of the first frame 9 and the upper portion of the second frame 10 are similarly fixed by welding at the diagonal 19 of the previously welded corner 17.
[0025]
Subsequently, the bent portion 15 of the first frame 9 having the corner 20 and the upper portion of the second frame 10 are similarly fixed by welding, and the frame is again tilted by 40 ° in the initial direction, and the remaining corner 18 , The bent portion 15 of the first frame 9 and the upper portion of the second frame 10 are similarly fixed by welding. As a result, the bent portion 15 of the first frame 9 and the upper portion of the second frame 10 are welded and fixed at all four corners.
[0026]
Here, the welding in the order of the corner 17, the corner 19, the corner 20, and the corner 18 is because the dimensional change due to the welding is smaller when the welding is first fixed in the diagonal direction, and when the frame is welded in a frame shape. This is because 16 four angles are excellent. Thereafter, the frame 16 is completed by sequentially welding and fixing the outer peripheries of the quadrangular joints of the first frame 9 and the second frame 10.
[0027]
Next, after the frame 16 is blackened, the R-shaped end of the side surface 11 of the first frame 9 on which the shadow mask 8 is stretched is cut into a predetermined R shape with higher accuracy. Then, the side face portion 11 of the first frame 9 is pressurized from both sides with the same force, and in this state, the shadow mask 8 is fixed by welding to the end of the side face portion 11 of the first frame 9 cut into an R shape. Thereafter, by releasing the force applied to the frame 16, tension is applied to the shadow mask 8, and the color selection mechanism 7 is completed. Here, the force applied to the frame 16 is 1300 kgf in the case of a 32-inch color cathode ray tube.
[0028]
FIG. 7 is a graph showing the amount of twist of the color selection mechanism 7 provided in the color cathode ray tube 1 according to the present embodiment. Here, the amount of torsion is measured by first setting the shadow mask surface of the color selection mechanism 7 downward, two places at both ends of the R surface in one first frame 9 and the center of the R surface in the other first frame 9. Support at a total of three points, one at a time. Next, the amount of deviation of both ends (for example, points A and B) of the first frame 9 supporting the center from the reference position is measured, and the difference AB is expressed as the amount of twist. As shown in FIG. 7, according to the method for manufacturing a color cathode ray tube according to the present embodiment, the variation in the amount of twist of the color selection mechanism 7 after the shadow mask is stretched can be suppressed to 0.30 by 3σ. it can.
[0029]
As a comparative example, the inclination angle when the bent portion 15 of the first frame 9 and the upper part of the second frame 10 are fixed by welding is 0 °, and the supply speed of the weld metal 21 is 0.6 m (m) / min (welding). The variation in the amount of torsion when the length was set to 21 g per millimeter (mm) was 3σ = 0.66 as shown in FIG.
[0030]
Here, the reason that the frame is twisted by stretching the shadow mask 8 is a variation in strength when the first frame 9 and the second frame 10 are fixed by welding. The welding of the first frame 9 and the second frame 10 is performed by TIG welding with the first frame 9 placed on the upper end of the second frame 10, but the bent portion of the first frame 9 becomes an R shape. Therefore, a gap is generated at the joint between the first frame 9 and the second frame 10, and the first frame 9 and the second frame 10 are not easily melted. In such a case, it is common to join the first frame 9 and the second frame 10 by supplying welding metal to the joint between the first frame 9 and the second frame 10 and welding while filling the gap. Can be considered.
[0031]
However, if the manner in which the weld metal enters the gap between the first frame 9 and the second frame 10 and the amount of supply are insufficient, the strength of the joint between the first frame 9 and the second frame 10 at four locations is increased. Variations occur, which causes frame distortion when the shadow mask 8 is stretched.
[0032]
In the comparative example, such a twist is conspicuously caused, whereas in the embodiment of the present invention, the entire frame is inclined with respect to the horizontal direction when the first frame and the second frame are fixed by welding. Thus, such a twist can be reduced.
[0033]
FIG. 8 is a graph showing the relationship between the amount of twist of the color selection mechanism 7 and the angle of inclination of the frame during welding. In the present embodiment, an example is shown in which the inclination angle when the bent portion 15 of the first frame 9 and the upper portion of the second frame 10 are fixed by welding is set to 40 °, but as shown in FIG. Within the range of 70 ° or less, the variation in the amount of twist of the color selection mechanism 7 can be reduced. More preferably, if the inclination angle is 30 ° or more and 60 ° or less, 3σ can be suppressed to 0.40 or less.
[0034]
Further, the supply amount of the weld metal 21 can sufficiently fill the gap generated at the joint between the first frame 9 and the second frame 10 unless the supply amount is 20 milligrams (mg) per millimeter (mm) of the welding length. Can not. Conversely, if more than 60 milligrams (mg) is supplied per millimeter (mm) of welding length, the deposited metal 21 will not melt and will remain in a rod shape. For this reason, it is preferable that the supply amount of the deposited metal 21 is not less than 20 milligrams (mg) and not more than 60 milligrams (mg) per millimeter (mm) of the welding length.
[0035]
As described above, the gap generated at the joint between the first frame 9 and the second frame 10 can be completely filled with the weld metal 21, so that the frame 16 having a stable welding strength with little variation between the four corners is produced. be able to. Thereby, since the variation in the amount of twist of the color selection mechanism 7 when the shadow mask 8 is stretched can be suppressed to a small value, a color cathode ray tube having excellent color purity can be obtained.
[0036]
As described above, according to the present embodiment, the second frame 10 to which the first frame 9 is fixed is tilted by a predetermined tilt angle with respect to the horizontal direction, and the tilted second frame 10 and first frame 9 The first frame 9 is fixed to the second frame 10 by welding while supplying the weld metal 21 therebetween. For this reason, the first frame 9 can be stably fixed to the second frame 10 without causing a variation in strength in the welded portion between the first frame 9 and the second frame 10. As a result, in the color selection electrode 7 after the shadow mask 8 is stretched, a variation in twist can be suppressed.
[0037]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a method of manufacturing a color cathode ray tube including a color selection electrode with less twist, and a color cathode ray tube manufactured using the color cathode ray tube with excellent color purity.
[Brief description of the drawings]
FIG. 1 is a partially cutaway sectional view showing a configuration of a color cathode ray tube according to the present embodiment. FIG. 2 is a perspective view showing an appearance of a color selection mechanism provided in the color cathode ray tube according to the present embodiment. FIG. 3 is a perspective view showing the appearance of a first frame provided in the color selection mechanism of the color cathode ray tube according to the embodiment. FIG. 4 is provided in the color selection mechanism of the color cathode ray tube according to the embodiment. FIG. 5 is a perspective view showing an assembled state of the first frame and the second frame. FIG. 5 illustrates a method of welding the first frame and the second frame provided in the color selection mechanism of the color cathode ray tube according to the present embodiment. FIG. 6 is a cross-sectional view for explaining a method of welding the first frame and the second frame provided in the color selection mechanism of the color cathode ray tube according to the present embodiment. Color selection provided in color cathode ray tube according to form 8 is a graph showing the relationship between the amount of twist of the color selection mechanism provided in the color cathode ray tube according to the present embodiment and the angle of inclination of the frame during welding. Perspective view showing the appearance of a color selection mechanism provided in a color cathode ray tube of the present invention.
DESCRIPTION OF SYMBOLS 1 Color cathode ray tube 2 Panel 3 Funnel 4 Phosphor screen 5 Neck 6 Electron gun 7 Color selection mechanism 8 Shadow mask 9 1st frame 10 2nd frame 11 Side part 12 Bottom part 13 Inclined part 14 Welded part 15 Bent part 16 Frame 17, 18, 19, 20 Square 21 Weld metal 22 Welding electrode

Claims (5)

A method for manufacturing a color cathode ray tube comprising a rectangular plate-shaped shadow mask, a pair of first frames supporting the shadow mask, and a pair of second frames supporting the first frame,
The pair of second frames arranged along a direction intersecting the longitudinal direction of the first frame with the pair of first frames arranged at a predetermined interval to support the shadow mask. Fixing both sides of the frame so as to form a square frame,
The second frame to which the first frame is fixed is tilted by a predetermined tilt angle with respect to the horizontal direction, and the first frame is supplied while supplying a weld metal between the tilted second frame and the first frame. And fixing to the second frame by welding. The method according to claim 1, wherein the inclination angle is not less than 20 degrees and not more than 70 degrees. The method for manufacturing a color cathode ray tube according to claim 1, wherein the inclination angle is not less than 30 degrees and not more than 60 degrees. A color cathode-ray tube including a rectangular plate-shaped shadow mask, a pair of first frames supporting the shadow mask, and a pair of second frames supporting the first frame,
The pair of second frames arranged along a direction intersecting the longitudinal direction of the first frame with the pair of first frames arranged at a predetermined interval to support the shadow mask. Fixing both sides of the frame so as to form a square frame,
The second frame to which the first frame is fixed is tilted by a predetermined tilt angle with respect to the horizontal direction, and the first frame is supplied while supplying a weld metal between the tilted second frame and the first frame. And a step of welding and fixing the color cathode ray tube to the second frame. The color cathode ray tube according to claim 4, wherein the inclination angle is not less than 20 degrees and not more than 70 degrees.

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