JPH04289630A - Manufacture of shadow-mask structure - Google Patents

Abstract

PURPOSE:To provide resistance against corrugates, tears, etc., caused upon mounting a shadow-mask on a frame and reduce the dispersion of tensile forces, given by the frame, between respective shadow-mask structures in a manufacturing method of the shadow-mask structure, in which a tensile force in a minor axis direction is designed to be applied across the shadow-mask mounted in the frame by means of a resilient force given to the frame. CONSTITUTION:Comprising such that the portion on which the rim part on a minor axis side of a shadow-mask being attached, namely a welding side, is inwardly folded at the larger angle than 90 deg. on a first frame constituted with a metal thin plate having a resilient force; it is welded in such a condition that the surface of the welding side is pushed and pressed so as to contact closely with the shadow-mask when welded. Since a tensile force due to the resilient force acting on the welding side is applied on the shadow-mask, the strength of the tensile force is stable while the dispersion between respective shadow-mask structures is reduced.

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 shadow mask structure.

0002

2. Description of the Related Art FIG. 4 is a diagram for explaining a conventional method of manufacturing a color selection electrode disclosed in Japanese Patent Application Laid-open No. 59-198633. ), a plurality of slits extending in the short axis direction are formed in the long axis direction. Reference numeral 2 denotes a frame to which the shadow mask 1 is welded, and a recess 4 is provided in the center bottom of the frame 2. 3 is the surface of the frame 2 on which the shadow mask 1 is pasted (hereinafter referred to as the "welding surface"); 5 is the claw holding down the shadow mask 1 (hereinafter referred to as the "holding device"); and 6 is the mounting surface of the frame 12. Reference plane of the stand (hereinafter referred to as "support stand"), arrow F indicates the compressive stress applied to the frame 2, arrow D indicates the direction of the tension applied to the shadow mask 1, arrow E
represents the moving direction of the support base 6.

Next, the operation will be explained. As shown in FIG. 4A, the four corners of the shadow mask 1 are held by the holding device 5, and tensile stress is applied in the direction of arrow D, that is, in the short axis direction of the shadow mask 1. Next, move the support base 6 in the direction of arrow E to move the frame 2 to the shadow mask 1.
At the same time, compressive stress (turnbuckle load) is applied to the frame 2 from the side in the direction of the arrow F, that is, in the short axis direction, and the shadow mask 1 is bent as shown in FIG. 4(b). Both sides of the frame 2 are welded and fixed to the welding surface 3 of the frame 2, for example, by seam welding. After being fixed by welding, the protruding portions (hereinafter referred to as "both ends") 1a of the shadow mask 1 protruding from the frame 2
is cut into a shadow mask structure 7 as shown in FIG. 4(c).

[0004] Here, when the turnbuckle load F is applied to the frame 2, the bottom surface of the frame 2 is deformed to curve, but since the bottom surface is formed with the recess 4,
The frame 2 is stabilized relative to the support base 6. That is, when transitioning from the setting shown in FIG. 4(a) to the state in which the turnbuckle load F is applied as shown in FIG. 4(b), the welding surface 3 comes to move parallel to the support base 6. in this way,
Since the frame recess 4 is reliably seated on the support base 6, the tension distribution of the shadow mask 1 caused by being pulled by the holding device 5 is stabilized.

[0005]

The conventional method for manufacturing a shadow mask structure is constructed as described above, and as shown in FIG.
When a compressive stress F is applied to the frame 2 as shown in the figure, a gap is created between the shadow mask 1 and the welding surface 3 due to variations in the strength of the recess 4 of the frame 2, and the shadow mask is wrinkled during welding. There was a problem that occurred. Also,
Due to variations in the strength of the frames, if the compressive stress F is set to a constant value, frame 2 may undergo permanent deformation as shown in Figure 6. Therefore, it is necessary to adjust the compressive stress applied to frame 2. Moreover, since tension is applied to the shadow mask 1, there is a problem that the workability is extremely poor, such as the shadow mask 1 being stretched by the heat during welding, resulting in insufficient tension and the risk of tearing. there were. Furthermore, when the shadow mask structure 7 is subjected to heat treatment for blackening treatment or the like after welding, there is a problem in that the tension distribution changes and problems occur.

The present invention has been made to solve the above-mentioned problems, and it has good workability, does not cause wrinkles or tears in the welded shadow mask 1, and also has color in the shadow mask structure 7. An object of the present invention is to obtain a method for manufacturing a shadow mask structure in which the distribution of tension applied to a shadow mask 1 is stable even when heat treatment such as blackening treatment is performed in the assembly process of a cathode ray tube or heat treatment is performed after blackening treatment. shall be.

[0007]

[Means for solving the problem] The shadow mask is welded in a state where the edge of the short axis side of the shadow mask of the frame is welded (welded side) with elastic force, and the elastic force of this welded side is The structure is such that a tensile force is constantly applied to the shadow mask using force.

[0008]

[Operation] In the shadow mask of the shadow mask structure manufactured according to the present invention, a stable tensile force is applied to the shadow mask by the elastic force of the welded edges of the frame. Therefore, variations in the strength of the tensile force applied to the shadow mask between shadow mask structures are reduced, and wrinkles and tears do not occur.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 8 denotes a first frame, which is made of an elastic thin plate such as a stainless steel plate, and has a welded side 9 bent inward at an angle θ greater than 90 degrees on the short axis side.
The tip of this welding side 9 is a curved part 1 bent inward.
0. 11 is shadow mask 1 during welding
This support stand 11 supports the shadow mask 1 when the first frame 8 is driven in the direction of arrow K and the curved part 10 and the welding side 9 following this are pressed against the shadow mask 1. The mask 1 is supported so as not to be deformed. Note that arrows E, K, J, and G in the figure indicate the moving directions of each device and part.

Next, the operation of this embodiment will be explained. Figure 1 (
In a), after both ends of the shadow mask 1 are held by the holding device 5, the shadow mask 1 is placed on the surface of the support base 11 with tension in the direction of arrow E being applied. The tension applied to the shadow mask 1 at this time may be such that the shadow mask 1 is held in a horizontal or nearly parallel state with respect to the support base 11, and that no wrinkles or waves are formed in the shadow mask 1 during welding.

Next, the first frame 8 is driven in the direction of arrow K and held with the welding side 9 in close contact with the shadow mask 1 as shown in FIG. 1(b). At this time,
Since the tip of the welding side 9 is formed into a curved part 10, it moves in the direction of the arrow H while following the shadow mask 1, so that it does not have a bad influence such as damaging the shadow mask 1.

Next, under the condition shown in FIG. 1(b), the welding edge 9 and the shadow mask 1 are welded together using a welding device (not shown). Next, when one claw of the holding device 5 is moved in the direction of arrow J to release the holding, as shown in FIG. A tension force is applied to the shadow mask 1 in the direction of the arrow D by the force of the mask 9 trying to restore its shape in the direction of the arrow G.

Next, the shadow mask 1 is welded to the first
The frame 8 has both vertical ends 1a cut off, as shown in FIG. 4(c), and is in the state shown in FIG. 2(a). Shadow mask 1 attached to this first frame 8
As shown in FIG. 2(a), the first frame 8 is pulled in the direction of arrow R, so that the open end becomes open. This first frame 8 is welded all around to a strong second frame 12 as shown in FIG. 2(b), and the side to which the shadow mask 1 is attached is pulled back in the direction of arrow P. A tensile force is applied to the shadow mask 1.

The shadow mask structure 7 thus constructed is subjected to heat treatment such as blackening treatment in the color cathode ray tube assembly process, so that the shadow mask 1 is formed in the direction of arrow V as shown in FIG. 3(a). Even if thermal expansion occurs, the first frame 8 has an elastic force as shown in FIG. 3(b), and
The welding side 9 bent at an angle wider than the right angle moves in the direction of arrow Q due to elastic force and applies tension D in the direction of arrow D to shadow mask 1, so that stable tension can be applied to shadow mask 1.

Note that in the above embodiment, the shadow mask 1
In order to apply a tensile force to the first frame 8 and the welding edge 9, elastic force is applied to the first frame 8 and the welding edge 9, but the same effect can be obtained even if the elastic force is applied only to the welding edge 9.

[0016]

As described above, according to the present invention, the welded side of the frame to which the shadow mask is attached has elastic force, and this elastic force applies tensile stress to the shadow mask. A method for manufacturing a shadow mask structure can be obtained in which there is little variation between mask structures and a stable tensile force can be applied to the shadow mask.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an assembly process according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of the assembly process of this embodiment.

FIG. 3 is a diagram for explaining the action during heat treatment in the assembly process of the color cathode ray tube of this embodiment.

FIG. 4 is an explanatory diagram of a conventional shadow mask manufacturing process.

FIG. 5 is a diagram for explaining the problems of this conventional example.

FIG. 6 is a sectional view showing permanent deformation that occurs in a conventional example.

[Explanation of symbols]

1 Shadow mask 5 Protective device 7 Shadow mask structure 8 First frame 9 Welding side 11 Support stand 12 Second frame

Claims (1)

[Claims] 1. A shadow mask formed by forming a plurality of slits extending in the short axis direction in the long axis direction is placed on the surface of a support base with a tensile force applied to an extent that does not cause wrinkles, etc. a first frame having a welded piece to which the
a step of fixing the first frame to the shadow mask in close contact with the shadow mask against the elastic force of the welding side, and a step of fixing the first frame to a strong second frame. A method for manufacturing a shadow mask structure, characterized in that the shadow mask is configured to apply a tensile force in the minor axis direction to the shadow mask by the elastic force of the welded side.