JP2000011867A - Manufacture of cathode-ray tube color selection electrode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an excellent color selection electrode that does not cause AG vibration by sufficiently abutting a damper wire stretched on the surfaces of a grid element body of a color selection mask on all the grid elements. SOLUTION: In this manufacturing method, a pair of bent arms 6a positioned on the upper and lower sides of a rectangular frame 6 are pressed in the direction to bring them close to each other, the upper edge part and the lower edge part of a sheet-like color selection mask material 70 are retained in a condition where each of them is mounted on a roundly curved surface 8a of a retaining means 8, thereafter, the end parts of a bent surface 6c of the bent arms 6a are projected by a dimension L2 more than the roundly curved surface 8a of the retaining means 8 in pressing the bent arms 6a in the pressed state against the color selection mask material 70 retained by the retaining means 8, and the color selection mask material 70 is welded to the bent surface 6c of the bent arms 6a in this condition.

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 cathode ray tube, and more particularly to a method of manufacturing a color selection electrode mounted in a cathode ray tube.

[0002]

2. Description of the Related Art Generally, a panel in front of a cathode ray tube has
A color selection electrode for selectively transmitting an electron beam emitted from the electron gun and irradiating the phosphor screen with the electron beam is attached. FIG. 2 is a perspective view of a cathode ray tube having a color selection electrode. In the figure, a stripe-shaped phosphor pattern (hereinafter, referred to as a phosphor stripe) is formed on the inner surface of a glass phosphor panel 1. This phosphor panel 1 is joined to a funnel 3 in which an electron gun 2 is sealed via a frit seal portion 4. In addition, a color selection electrode 5 is attached to the inner surface (the surface on which the phosphor stripe is formed) of the phosphor panel 1 in close proximity thereto. The color selection electrode 5 includes a rectangular frame 6 and a color selection mask (aperture grill) 7 that is stretched by applying tension to the frame 6.

The frame 6 includes a pair of upper and lower curved arms 6a.
And a pair of left and right connecting arms 6b. The color selection mask 7 is made of a thin metal sheet, and its upper edge and lower edge are welded to the pair of curved arms 6a. In addition, a large number of narrow tape-shaped grid bodies (hereinafter, abbreviated as grid bodies) are formed on the color selection mask 7 in a shape corresponding to the shape of the phosphor stripe of the phosphor panel 1.

FIG. 3 is a process flow chart showing a procedure for assembling a color selection electrode. First, when assembling the color selection electrodes, as shown in FIG. 3 (a), a compressive force F is applied to the pair of curved arms 6a from the outside to press the frame 6, while the square sheet-shaped color selection is performed. The mask material (flat aperture grill) 70 is placed on the pair of holders 8. Each holder 8 has an R curved surface 8a having a radius of curvature slightly larger than the radius of curvature of the curved arm 6a in a pressurized state, and the color selection mask material 70 is placed on the R curved surface 8a. You.

Next, as shown in FIG. 3B, the color selection mask material 7 placed on the R-curved surface 8a of each holder 8 is provided.
0 is sandwiched between a pair of holding jigs 9 curved at the same curvature as the R-curved surface 8a and pulled with a force f, and the frame 6 is pressed against the color selection mask material 70 in this state. At this time, the pair of curved arms 6a located above and below the frame 6 are in contact with the color selection mask material 70.

Subsequently, as shown in FIG. 3 (c), the disk-shaped welding electrode 10 is pressed down against the pressed portion between the frame 6 (horizontal frame 6a) and the color selection mask material 70,
By moving the welding electrode 10 in the direction of the arrow in FIG.
(Curved surface of the curved arm 6a). After this welding, by releasing the pressurized state (compressive force F) of the frame 6, a predetermined tension is applied to the grid body of the color selection mask material 70.

Thereafter, as shown in FIGS. 3D and 3E, an outer peripheral portion (peripheral portion) 7 of the color selection mask material 70 is formed.
By removing Oa, the color selection mask 7 is stretched on the frame 6 and the assembly of the color selection electrode 5 is completed at this time.

Further, as shown in FIG. 4, for the color selection electrode 5 assembled in this way, for the purpose of preventing the grid element 7a of the color selection mask 7 from vibrating, for example, a fine wire (hereinafter referred to as a 10-30 μm diameter) is used. , Damper wire) 1
1 is stretched. The die wire 11 is placed in a state perpendicular to the longitudinal direction of the grid element 7a of the color selection mask
One or more wires are provided, and the tension is maintained by a spring force of the spring member 12 that supports the end of the wire.

In the manufacturing process of such a color selection electrode 5, the color selection mask material 70 is placed on the holder 8 having a curvature radius slightly larger than the curvature radius of the curved arm 6a in the pressurized state as described above. In a state in which it is placed, and is sandwiched by the holding jig 9 from above and pulled by a force f, as shown in FIGS. 5 and 6,
Some irregularities called “wrinkles” remain on the grid element surface of the color selection mask material 70.

Therefore, in actual welding, the curved surface of the curved arm 6a in the pressurized state (the surface to which the color selection mask material 70 is welded) is raised to the vicinity of the R curved surface 8a of the holder 8, and the color selection mask material is raised. By pressing the curved arm 6a against 70, the wrinkles of the color selection mask material 70 are released to the outside along the curved surface of the curved arm 6a, thereby preventing the generation of wrinkles on the grid structure surface.

[0011]

By the way, in the conventional color selection electrode 5, the radius of curvature of the curved arm (non-pressed state) 6a is about 2000 mm even if the radius of curvature is large. With the flattening of the display screen, the radius of curvature of the curved arm 6a has increased to 4000 mm or more. In the case of the curved arm 6a that is curved (slowly curved) with a large radius of curvature, the curvature of the frame itself varies with respect to the curvature of the R curved surface 8a of the holder 8, and the partial frame in a pressurized state. The influence of curvature distortion and the like increases.

Therefore, even if the curved surface of the curved arm 6a in the pressurized state is raised to the vicinity of the R curved surface 8a of the holder 8, the wrinkles cannot be sufficiently released, and the grid element of the color selection mask 7 which has been assembled is not sufficiently removed. Wrinkles remain on the body. Then, as shown in FIG. 7 and FIG.
When the die wire 11 is stretched on the surface of the above, the die wire 11 does not sufficiently hit all the grid elements 7a, and the grid element 7a vibrates during the operation of the cathode ray tube.
A so-called AG drip occurs.

[0013]

In the method of manufacturing a color selection electrode for a cathode ray tube according to the present invention, a pair of curved arms located above and below a rectangular frame are pressed in a direction approaching each other, and a sheet-like color is pressed. When the upper edge and the lower edge of the selection mask material are held on the R-curved surface of the holder, respectively, and then the pressing arm is pressed against the color selection mask material held by the holder. Making the end of the curved surface of the curved arm protrude from the R curved surface of the holder,
In this state, the color selection mask material was welded to the curved surface of the curved arm.

According to the above-described method for manufacturing a color selection electrode for a cathode ray tube, when the pressurized curved arm is pressed against the color selection mask material held by the holder, the end of the curved surface of the curved arm is placed on the R of the holder. By protruding from the curved surface, a strong pulling force acts on the grid body surface of the color selecting mask material, and the wrinkles of the grid body surface are released to the outside by the pulling force. Therefore, by welding the color selection mask material to the curved surface of the curved arm in this state, it is possible to suppress the occurrence of wrinkles on the grid element body surface.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the present embodiment, the same reference numerals are given to the same components as those of the above-described related art, and the overlapping description will be omitted as much as possible.

FIG. 1 is a view for explaining an embodiment of a method for manufacturing a color selection electrode of a cathode ray tube according to the present invention, wherein FIG. 1 (a) is a perspective view thereof, and FIG. Is shown.

First, when assembling the color selection electrodes, as shown in FIGS. 3 (a) and 3 (b), a compressive force F is applied to the pair of curved arms 6a from the outside, respectively.
While pressing the upper edge and the lower edge of the color selection mask material 70 on the R-curved surface 8a of the holder 8, and pressing the color selection mask material 70 with the holding jig 9 from above.
Pull with.

Thereafter, the color selection mask material 70 held by the holder 8 and the frame 6 to which the compressive force F is applied are moved relatively close to each other as described above, so that the color selection mask material 70 is pressed. Of the curved arm 6a.

At this time, in this embodiment, FIG.
As shown in (a) and (b), the end of the curved surface 6c of the curved arm 6a is made to protrude beyond the R curved surface 8a of the holder 8. Incidentally, “L1” in FIG. 1B indicates a protrusion dimension of a central portion of the arm curved surface 6c based on the R curved surface 8a of the holder 8, and “L2” indicates an R curved surface 8a of the holder 8.
2 shows a protrusion dimension of an end of the arm curved surface 6c with reference to FIG. In addition, the magnitude relationship between the protrusion dimensions L1 and L2 is such that the radius of curvature of the R curved surface 8a of the holder 8 is
Is slightly larger than the radius of curvature of the curved surface 6c, the relationship L1> L2 holds.

When the curved arm 6a is pressed against the color selection mask material 70 as described above, the end of the curved surface 6c of the curved arm 6a is made to protrude beyond the R curved surface 8a of the holder 8, so that the curved arm (non- Even when the radius of curvature of 6a is as large as 4000 mm or more, the upper and lower edges of the color selection mask material 70 extend over the entire width (left and right ends) of the grid body surface and extend along the length of the grid body. Since a strong pulling force acts uniformly along the direction, the wrinkles which existed on the surface of the grid body are forcibly released to the outside.

Therefore, in this state, FIG.
By rotating and moving the welding electrode 10 as shown in (c), the color selection mask material 70 is moved to the curved surface 6 of the curved arm 6a.
By welding to c, generation of wrinkles on the grid element body surface can be reliably suppressed. As a result, in the assembled color selection electrode, no wrinkles remain on the grid element surface of the color selection mask 7 stretched on the frame 6, so that the damper wires 11 ( 4 (see FIG. 4) can be uniformly contacted to effectively prevent AG waviness on the grid body surface.

Here, the present inventor examined the relationship between the projecting dimension L2 of the end of the curved surface 6c of the curved arm 6a and the state of occurrence of AG yule, and found the results shown in Table 1 below. Obtained. In Table 1, "Rz" is a radius of curvature of the curved arm 6a in a non-pressurized state (before pressurization).

[0023]

[Table 1]

From Table 1, the bending arm 6a in the pressurized state
Is pressed against the color selection mask material 70, the end of the arm curved surface 6c is projected more than 1.0 mm from the R curved surface 8a of the holder 8, thereby suppressing wrinkles on the grid element body surface, It turns out that Yure can be effectively prevented. On the other hand, the protruding dimension L2 of the end of the arm curved surface 6c
Is set larger than 7.0 mm (L2 = 7.5 mm), the color selection mask material 7 near the center of the curved arm 6 is set.
An excessive load was applied to 0, which resulted in the occurrence of cracks in the grid element surface of the color selection mask material 70.

From the above results, the projecting dimension L2 of the end of the arm curved surface 6c based on the R curved surface 8a of the holder 8 is set so as to satisfy the condition of 1.0 mm ≦ L2 ≦ 7.0 mm. This makes it possible to prevent wrinkles from occurring on the grid element surface without causing cracks on the grid element surface of the color selection mask material 70.

[0026]

As described above, according to the present invention, when the pressurized curved arm is pressed against the color selection mask material held by the holder, the end of the curved surface of the curved arm is used as the R of the holder. By making the mask material for color selection weld to the curved surface of the curved arm in this state,
Even if the radius of curvature of the curved arm becomes large, the generation of wrinkles in the color selection mask can be effectively suppressed. This makes it possible to bring the damper wire stretched over the grid element surface of the color selection mask into sufficient contact with all the grid elements, thereby obtaining a good color selection electrode free of AG blur. .

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an embodiment of a method for manufacturing a color selection electrode of a cathode ray tube according to the present invention.

FIG. 2 is a perspective view of a cathode ray tube having a color selection electrode.

FIG. 3 is a process flow chart showing a procedure for assembling a color selection electrode.

FIG. 4 is a perspective view showing an attached state of a die wire.

FIG. 5 is a perspective view showing a state of a grid element body surface during assembly.

6 is a sectional view taken along line AA of FIG.

FIG. 7 is a diagram illustrating a conventional problem.

FIG. 8 is a sectional view taken along the line BB of FIG. 7;

[Explanation of symbols]

5: color selection electrode, 6: frame, 6a: curved arm, 6
c: curved surface, 7: mask for color selection, 8: holder, 8a ...
R curved surface, 70 ... Mask material for color selection

Claims (2)

[Claims] 1. A pair of curved arms located above and below a rectangular frame are pressed in a direction approaching each other, and an upper edge and a lower edge of a sheet-like color selection mask material are respectively curved by an R curved surface of a holder. Then, when the curved arm in the pressurized state is pressed against the color selection mask material held by the holder, the end of the curved surface of the curved arm is placed on the R curved surface of the holder. A color selection mask material is welded to a curved surface of the curved arm in this state. 2. A method for manufacturing a color selection electrode for a cathode ray tube according to claim 1, wherein an end of a curved surface of said curved arm projects from an R curved surface of said holder in a range of 1 mm or more and 7 mm or less. .