JPH11306972A - Manufacture of color selection electrode structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a color selection electrode structure of a color cathode-ray tube whereby it is possible to preclude variation of the opening width of the outermost slit. SOLUTION: In the process to weld a flat grille 15 to the two support bars 9 and 10 of a frame, a support part 20 on the outside of the thin metal streak part of the flat grille 15 is solely welded in the condition that a specified load is applied to the frame, and then the load applied to the bars 9 and 10 is decreased or relieved, and support part 20 on the outside of a tape part 18 as unwelded portion of the grille 15 is welded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a stretchable color selection electrode assembly used for a color cathode ray tube.

[0002]

2. Description of the Related Art FIG. 4 is a schematic cross-sectional view of a color cathode ray tube having a stretched color selection electrode assembly. In the figure, reference numeral 1 denotes a tube, which is formed by joining a panel portion 4 to an open end of a funnel 3 having a neck portion 2. Reference numeral 5 denotes an electron gun arranged in the neck portion 2, 6 denotes a stripe-shaped fluorescent screen formed on the inner surface of the face plate 7 of the panel portion 4, 8
Reference numeral denotes a stretchable color selection electrode assembly that is disposed in the panel unit 4 so as to face the fluorescent screen 6 and determines the arrival position of the electron beam. The color selection electrode assembly includes, for example, red, green, and blue colors emitted from the electron gun 5. The corresponding electron beam is projected on the phosphor stripe of the corresponding color on the phosphor screen 6.

FIG. 5 is a perspective view showing a bridge type color selection electrode assembly. The bridge-type color selection electrode structure 8 includes a pair of support rods 9 that are arranged at predetermined intervals in parallel and opposed to each other.
10 and a pair of elastic supports 11 and 12 attached between the vessel points of the support rods 9 and 10 or at positions near the vessel point.
And a flat grill 15 provided with a number of metal strips 14 arranged in parallel so as to extend between the support rods 9 and 10 on a frame 13 composed of An electron beam passage hole (slit) 16 through which the electron beam passes is formed between the strips 14.

The color selecting electrode assembly 8 usually has a through hole provided at the free end of an elastic holding member (not shown) attached to one of the support rods 9 and the elastic supports 11 and 12, respectively. Stud pin (not shown) provided on the inner side wall
And is attached to a predetermined position in the panel unit 4 by so-called three-point support.

The flat grill 15 is usually manufactured by subjecting a thin plate material to a chemical etching process. FIG. 6 is a front view showing a configuration of the flat grill 15 of FIG.
Reference numeral 17 denotes a metal strip 1 spaced from both ends of the metal strip 14.
A half etching line formed by chemically etching about half of the thin plate material in a direction crossing the longitudinal direction of 4;
Numeral 18 is a tape portion provided in parallel on both outer sides of the outermost metal strip 14 to limit an effective screen when the phosphor stripe is printed on the phosphor screen 6, and the width of the tape section is usually set to the width of the metal strip 14. It's wider than that of. Reference numerals 19 denote separation holes provided so as to reach the half-etching line 17 at intervals from both outer sides of the outermost metal strip 14, which define the width of the tape portion 18 and separate unnecessary portions. It is provided as. 20 is a metal strip 1
4 and the portion between the end of the half-etching line 17;
That is, the flat grill 15 is a support portion provided at a portion extending in the length direction of the metal strip 14, and the flat grill 15
This is the part that is welded and fixed to zero.

[0006] A method for manufacturing the stretchable color selection electrode assembly 8 configured as described above will be described with reference to the drawings. FIG. 7 is a main process flow diagram, FIG. 8 is a perspective view showing a frame, and FIG.
FIG. 2 is a perspective view showing a conventional manufacturing method.

First, as shown in FIG. 8, a state is shown in which a load in the direction of the arrow is applied to both support rods 9, 10 of the frame 13, that is, a load is applied from the opposite sides of the support rods 9, 10 to each other. The flat grill 15 shown in FIG. 6 is placed on the two support rods 9 and 10 with the two elastic supports 11 and 12 bent so as to bring the two support rods 9 and 10 close to each other. Next, as shown in FIG. 9, welding is performed like a linear welding line 22 using an electrode 21 of a welding machine, and the flat grill 1 is welded.
5 is welded to the tape portion 18, that is, to the end thereof. Then, the load applied to both support rods 9 and 10 is released, and the metal strip 1 is restored by the restoring force of both elastic supports 11 and 12.
The tension is applied to the metal strip 4 and the tape section 18, and the direction is the length direction of the metal strip 14 and the tape section 18. Then, the unnecessary outer peripheral portion 23 of the flat grill 15
Is trimmed and removed along a pair of half etching lines 17, thereby producing a stretchable color selection electrode structure 8 as shown in FIG.

[0008] The stretched color selection electrode assembly 8 manufactured as described above is subjected to a heat treatment (for example, a blackening treatment) in a normal color cathode ray tube manufacturing process, and is incorporated in the color cathode ray tube.

[0009]

However, in the above-described conventional method of manufacturing the color selection electrode structure 8, the frame 13
10, the tension of the tape portion 18 may be larger than that of the metal strip 14 due to heat treatment or the like in the color cathode ray tube manufacturing process, as shown in FIG. In some cases, the width of the opening at the center of the opening is wider than the width of both ends. As a result, there is a problem that the exposure amount and the exposure shape at the time of forming the phosphor screen are not the predetermined value and the predetermined shape, thereby deteriorating the image quality of the displayed image.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to manufacture a color selection electrode assembly for a color cathode ray tube capable of keeping the opening width of the outermost end slit from changing. The aim is to get the method.

[0011]

According to the present invention, there is provided a method for manufacturing a color selection electrode assembly, comprising: applying a load between two support bars constituting a frame to each other so as to approach each other; Is welded to both support rods, and then the load is reduced or released to weld the support part outside the tape section to both support rods.

Further, according to the method of manufacturing a color selection electrode assembly according to the present invention, the support portion outside the metal strip portion is covered with the metal strip portion welding insulator. After welding to the support rod, remove the metal strip welding insulation,
Then, the support portion outside the tape portion is welded to both support rods in a state where the support portion outside the metal strip portion is covered with a tape portion welding insulator.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. Note that the same reference numerals in the drawings denote the same or corresponding components as those in the related art.

Embodiment 1 FIG. 1 is a flow chart of main manufacturing steps showing a method for manufacturing a color selection electrode assembly according to Embodiment 1 of the present invention, and FIGS. 2A and 2B show main steps of Embodiment 1 of the present invention. It is a principal part perspective view.

First, similarly to the conventional method shown in FIG.
In a state where a load is applied to both support rods 9 and 10 of the frame 13, the support portion 20 on the extension of the metal strip 14 of the flat grill 15 is welded and fixed to both support rods 9 and 10 by the method shown in FIG. 9. I do. At this stage, as shown in FIG. 2A, the support portion 20 on the extension of the tape portion 18 of the flat grill 15 has not been welded yet. Next, the frame 13
After the load applied to both support rods 9 and 10 is reduced or released, the portion on the extension of the tape portion 18 which is the unwelded part of the support portion 20 is applied to both support rods 9 and 10 by the method shown in FIG. Weld and fix. FIG. 2B shows a state after the completion of this step. The subsequent manufacturing process is the same as the above-described conventional manufacturing method. By trimming and removing the unnecessary outer peripheral portion 23 of the flat grill 15 along the pair of half etching lines 17, the stretching as shown in FIG. The formula color selection electrode structure 8 is manufactured.

According to the method of the first embodiment, the load applied to the frame 13 is reduced or released to weld the portion on the extension of the tape portion 18, so that the color selection electrode assembly 8 at the time of completion of the color selection electrode assembly 8 is formed. In the tension distribution applied to the flat grill 15 from the frame 13, the tension of the tape portion 18 does not become larger than that of the thin metal plate 14. As a result, the opening width at the center of the outermost end slit 24 in the color selection electrode assembly 8 does not become wider than the width of both ends thereof, and the opening width of the outermost end slit 24 does not change. Deterioration of image quality can be prevented.

Embodiment 2 FIG. A method for manufacturing the color selection electrode assembly 8 according to Embodiment 2 of the present invention will be described with reference to FIG. First, as in the first embodiment described above, in a state where a load is applied to both the support rods 9 and 10 of the frame 13 (see FIG. 8), the support portion 20 on the extension of the metal strip 14 of the flat grill 15 is formed. Are welded and fixed to both support rods 9 and 10 (see FIG. 9). At the time of this welding, a portion of the support portion 20 of the flat grill 15 on the extension of the tape portion 18 is shown in FIG.
As shown in (a), after covering with a metal strip welding insulator 25, only the support portion 20 on the extension of the metal strip 14 is welded and fixed to both support rods 9 and 10 with the welding electrode 21. The welding electrode 21 is kept away from the welding portion of the flat grill 15, and the metal strip welding insulator 25 is separated from the flat grill 15.
Remove from Next, the load on both support rods 9 and 10 is reduced or released, and the support portion 20 on the extension of the previously welded metal strip 14 is taped as shown in FIG. 26, only the support portion 20 on the extension of the tape portion 18 which is an unwelded portion with the welding electrode 21 is welded and fixed to both the support rods 9 and 10, and the welding electrode 21 is welded to the flat grill 15 at the welding portion. The tape welding insulator 26 is removed from the flat grill 15 while keeping away from the flat grill 15. Subsequent manufacturing steps are the same as in the first embodiment.

The second embodiment is different from the first embodiment in that both the support rods 9 and 10 of the frame 13 and the flat grill 1
In the case of welding with No. 5, the use of the two types of insulators described above, that is, the insulator 25 for welding the metal strip and the insulator 26 for welding the tape portion, it is possible to block the area other than the predetermined welding range. It is possible to improve the accuracy of the start and end positions of the welding at the portion on the extension of the metal strip 14 of the grill 15 and the portion on the extension of the tape portion 18.

[0019]

According to the method for manufacturing a color selection electrode assembly according to the present invention, the outer side of the metal strip portion is applied in a state where a load is applied between the two support rods so that the two support rods constituting the frame approach each other. After welding only the support part to both support rods, the load was reduced or released and the support part outside the tape part was welded to both support rods, so the hole at the center of the outermost end slit was opened. Since the width does not become wider than the opening width at both ends and the opening width of the outermost end slit does not change, deterioration of the image quality of the displayed image can be prevented.

Further, according to the method of manufacturing a color selection electrode assembly according to the present invention, the support portion outside the metal strip portion is covered with the support portion outside the tape portion covered with the metal strip welding insulator. Is welded to both support rods, the metal strip welding insulator is removed, and then the support section outside the tape section is covered with the support section outside the metal strip section covered with the tape welding insulator. Is welded to both support rods, so that the accuracy of the start and end positions of welding of the support portion outside the metal strip portion and the support portion outside the tape portion can be improved.

[Brief description of the drawings]

FIG. 1 is a main manufacturing process diagram showing a method for manufacturing a color selection electrode assembly according to Embodiment 1 of the present invention.

FIG. 2 is a perspective view of a main part of main manufacturing steps showing a method of manufacturing the color selection electrode assembly according to Embodiment 1 of the present invention.

FIG. 3 is a perspective view of a main part of main manufacturing steps showing a method of manufacturing a color selection electrode assembly according to Embodiment 2 of the present invention.

FIG. 4 is a schematic sectional view of a color cathode ray tube.

FIG. 5 is a perspective view showing a configuration of a stretchable color selection electrode assembly.

FIG. 6 is a front view showing a configuration of a flat grill.

FIG. 7 is a main manufacturing process diagram showing a conventional method for manufacturing a color selection electrode assembly.

FIG. 8 is a perspective view showing a configuration of a frame.

FIG. 9 is a perspective view showing a manufacturing process of a conventional color selection electrode assembly.

FIG. 10 is a front view showing a change in the shape of the opening of the outermost end slit.

[Explanation of symbols]

8: Stretched color selection electrode assembly, 9: Support rod, 1
0: support rod, 11: elastic support, 12: elastic support, 13: frame, 14: metal strip, 15: flat grill, 18: tape part,
20: support part, 21: welding electrode,
22: welding line, 24: outermost end slit,
25: Insulator for welding metal strip, 26: Insulator for welding tape.

Claims (2)

[Claims] 1. A metal strip portion provided with a large number of linear metal strips in parallel, and a tape portion provided in parallel on both outer sides of an outermost metal strip and wider than said metal strips. A flat grill provided with support portions provided on both outer sides in the longitudinal direction of the metal strip and the tape portion, a pair of support rods disposed opposite each other at a predetermined interval, and between the two support rods In a method of manufacturing a color selection electrode assembly by welding to a frame composed of a pair of elastic supports attached at predetermined intervals, a method for manufacturing a color selection electrode assembly includes the steps of: After welding only the support portion outside the metal strip portion to the two support bars while applying a load, the load is reduced or released to reduce the support portion outside the tape portion to the two support bars. A method for producing a color selection electrode assembly, comprising: 2. The method according to claim 1, further comprising: welding the support outside the metal strip to both support rods while covering the support outside the tape with a metal strip welding insulator; Removing the insulating material, and then welding the outer supporting portion of the tape portion to the two support rods in a state where the outer supporting portion of the metal strip portion is covered with the insulating material for tape portion welding. The method for producing a color selection electrode assembly according to claim 1.