JPH11144637A - Damper spring stretching structure and color cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce color displacement on an image plane by damping the vibration of an aperture grill in a short time. SOLUTION: Damper springs 12 stretch damper wires 9 on an aperture grill 5. During a heating process, the damper wires 9 are stretched out and the tips of the damper springs 12 are moved. Since this moving vector is directed toward the upper side of the tangent (shown by a dashed line in the Fig.) at the curved surface edge of a frame 61, when the damper wires 9 return to the state before the heating process by being thermally shrunk, the damper wires 9 can come in contact with the aperture grill 5 securely even in the region adjacent to an aperture grill tape. In the manufacturing process of a color cathode-ray tube, even if the temperature of the damper wire 9 rises and the shape of the damper spring 12 is deformed, the outermost edge of the aperture grill tape does not plastically deformed with twist and after the temperature goes down, the damper wire 9 can press the surface of the aperture grill 5 all the way to the outermost edges.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a suspension structure of a damper spring for attaching a damper wire to a frame of a color selection mask having a predetermined curved surface, and a color cathode ray tube.

[0002]

2. Description of the Related Art FIG. 7 is a view showing a horizontal section of a conventional damper spring stretching structure.

In an aperture grill (AG) type color cathode ray tube, an aperture grill is provided as a color selection mask so as to face the inner surface of the screen panel. The color selection mask shown in FIG. 7 includes an aperture grille 5, a pair of vertically extending frames 6, and a pair of horizontal frames (not shown). Further, in order to attenuate the vibration of the aperture grill 5 due to the external vibration, one or two tungsten wires of 10 to 50 μm, preferably 10 to 20 μm are provided on the surface of the aperture grill 5 with a damper. Stretched as line 9.

[0004] Although not shown in FIG. 7, upper and lower sides of the frame 6 are provided with horizontal frames opposed to each other, and both ends of the aperture grille 5 forming a stripe-shaped light shielding portion are welded to each other. Has been fixed by. Also,
Damper springs 12 are welded to the vertical frame 6 via clips 10 at symmetrical positions, and a damper wire 9 is stretched between the damper springs 12 with a tension of 10 to 50 g.

When the aperture grill 5 is welded to the frame, the horizontal frame is pressurized from above and below, and fixed in a state of being close to each other. When the load on the frame is removed after such welding, the aperture grill 5
Is fixedly held in a stretched state by a predetermined tension with respect to the frame. In this case, an aperture grill tape 5a having a larger width than the others is arranged at the left and right extreme ends of the aperture grill 5, so as to secure the strength of the entire aperture grill 5.

Incidentally, in a general color cathode ray tube manufacturing process, it is necessary to treat each component by a heat process. In particular, regarding the color selection mask, in the initial stage of the thermal process, all of the components do not reach the same temperature, and the damper wire 9 having a very small heat capacity is used.
The temperature rises fastest. When the temperature rise causes the damper wires 9 to thermally expand, the damper springs 12 which bend inwardly and support the damper wires 9 on both ends gradually elastically deform outward.

FIG. 8 is a sectional view showing a process of deforming a conventional damper spring.

In FIG. 8, reference numeral 61 denotes a horizontal frame arranged above and below the vertical frame 6 in FIG.
The frame 61 forms a predetermined RZ curved surface according to the curved surface on the inner surface of the screen panel. In the conventional damper spring suspension structure, as shown in FIG.
An angle on the obtuse angle side formed by the Z axis of the color selection mask and a tangent (dashed line in the figure) at the curved surface end of the frame 61 is α,
Damper spring 1 at the junction with damper wire 9
2 normal line to the longitudinal direction (indicated by a two-dot chain line in the figure)
Is an angle formed with respect to the Z axis, and when β is an angle having an isotopic relationship with the angle α, α−β <0. Therefore, the damper wire 9 of the damper spring 12
Is gradually moved in the vector direction indicated by the arrow during the heat process. When the deformation of the damper spring 12 indicated by this vector is viewed from the side, the angle β changes so as to gradually increase.

[0009]

That is, when the damper wire 9 thermally expands in the manufacturing process of the color cathode ray tube, the tip of the damper spring 12 is positioned at the curved end of the horizontal frame 61 vertically opposed to each other. , While moving in the negative direction of the Z-axis beyond the tangent of the curved surface convex in the Z-axis direction. The angle β is larger than the angle α formed by the tangent with the Z axis. Therefore, the damper wire 9 causes the aperture grill tape 5a at the extreme end to be greatly twisted.

As described above, the temperature rise during the heating step causes
The end of the aperture grill tape 5a is thermoplastically deformed while being largely twisted, and the twist of the aperture grill tape 5a does not return to its original state even if the temperature decreases after the completion of the heating process.

When the endmost aperture grill tape 5a is deformed by twisting, the damper wire 9 is lifted from the surface of the aperture grill 5 in the area adjacent to the aperture grill tape 5a. No contact occurs near the portion, or the contact pressure to the aperture grill 5 becomes insufficient. As a result, the function of the damper wire 9 is impaired, and the vibration damping time of the aperture grill 5 becomes longer.

Therefore, the conventional damper spring 1
In the stretching structure of No. 2, there is a problem that the function of the damper wire 9 is impaired, so that the vibration of the aperture grill 5 is not attenuated in a short time, and the color selection function of the Avertia grill mask is not properly exhibited. The present invention has been made to solve the problems described above,
An object of the present invention is to provide a suspension structure of a damper spring capable of attenuating vibration of an aperture grill in a short time and stably and appropriately exhibiting a color selection function, and a color cathode ray tube capable of reducing a color shift of a screen.

[0013]

According to a first aspect of the present invention, there is provided a damper spring for attaching a damper wire to a frame of a color selection mask having a predetermined curved surface. In the spanning structure of the damper spring in which the vibration of the aperture grill constituting the above is suppressed by the damper wire, the angle on the obtuse angle side between the Z axis of the color selection mask and the tangent at the curved surface end of the frame is α, The angle formed by the normal to the longitudinal direction of the damper spring at the junction with the line with respect to the Z axis, and β is an angle having an isotopic relationship with the angle α, α-β ≧ 0. It is what was constituted.

[0014] In the stretch structure of a damper spring according to the second aspect of the present invention, the damper spring is attached to a frame of a color selection mask via a spacer.

Further, according to the third aspect of the present invention, the spacer is made of a rigid body.

Furthermore, a color cathode ray tube according to the invention of claim 4 is provided with the damper spring spanning structure of any one of claims 1 to 3.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment of the present invention will be described.

Embodiment 1 FIG. 1 is a cross-sectional view showing a damper spring spanning structure according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 5 denotes an aperture grille which extends over a plurality of aperture grille tapes to form a color selection mask, 5a denotes an endmost aperture grille tape which is wider than others, and 61 denotes an aperture grille. A frame to which a surface 5 is fixed has a predetermined curved surface, 9 is a damper wire stretched to suppress the vibration of the aperture grille 5, and 12 is provided to apply tension to the damper wire 9 to support it. Damper spring.

In the first embodiment, as shown in FIG. 1, the state in which the damper wire 9 of the damper spring 12 is stretched is different from the conventional state shown in FIG. It is characterized in that the tip movement vector of the spring 12 is directed upward from a tangent (indicated by a dashed line in the figure) at the curved surface end of the frame 61. Therefore, when the damper wire 9 is thermally contracted and returned to the state before the heating step, the damper wire 9 is also in the area adjacent to the aperture grill tape 5a.
, So that it can be reliably contacted.

FIG. 2 is a configuration diagram showing an aperture grill type color cathode ray tube (aperture grill tube).

In this aperture grill tube, a panel 1, a funnel 2, and a neck tube 3 constitute an envelope. An electron gun 4 is provided in the neck tube 3 and the panel 1
Inside, a color selection mask 7 composed of an aperture grille 5 and a frame 6 is provided. A magnetic shield 8 is attached to the color selection mask 7.

FIG. 3 is a perspective view showing a detailed configuration of the color selection mask 7. As shown in FIG. As shown in FIG. 3, the color selection mask 7 has a configuration in which the aperture grille 5 which is a stripe-shaped light shielding portion is welded to a vertically opposed frame 61. 1
0 is a clip welded to the upper and lower and left and right frames 61 and 6, and 11 is a spring for fixing the color selection mask 7 inside the panel 1. Each of the two damper wires 9 is horizontally stretched by a damper spring 12 on the front surface of the aperture grill 5. The damper spring 12 of the damper wire 9 arranged on the upper side of the screen is directly fixed to the clip 10, while the damper spring 12 of the damper wire 9 on the lower side of the screen is
11 for attaching to a CRT
To be fixed. However, it may be directly welded to the frame 6 of the color selection mask 7.

FIGS. 4A, 4B and 4C are diagrams showing the tangent and the angle α, the normal and the angle β, and the welding angle γ of the damper spring, respectively.

FIG. 4A defines the angle α. That is, an angle (obtuse angle) formed by a tangent (indicated by a dashed line in the figure) at the curved surface end of the frame 61 forming a predetermined curved surface with respect to the Z axis of the color selection mask is defined as an angle α.

FIG. 4B defines the angle β. That is, at the joint between the damper spring 12 and the damper wire 9 after the damper wire 9 is stretched, a normal line to the longitudinal direction of the damper spring 12 with respect to the Z axis of the color selection mask (indicated by a two-dot chain line in the drawing). ) Is an angle which is in the relation of the isotope angle with the angle α.

FIG. 4C defines the angle γ. That is, the angle at which the damper spring 12 is welded to the clip 10 of the frame 6 is defined as γ.

Then, the damper spring 12 is arranged as shown in FIG.
As shown in FIG. 5, the tension on the damper wire 9, the length of the damper spring 12,
And the angle γ when welding the damper spring 12 to the frame 6 is adjusted.

In the damper spring stretching structure configured as described above, the temperature of the damper wire 9 having a very small heat capacity in the components of the color selection mask 7 in the heating process during the manufacturing process of the color cathode ray tube. When the damper wire 9 rises fastest, the damper wire 9 thermally expands and the damper spring 12 is deformed, the following effects are obtained.

FIG. 5 is a view for explaining the moving direction of the tip end position of the damper spring 12 when the tension structure of the damper spring 12 is α-β> 0, α-β = 0 and α-β <0. .

Structure of Embodiment 1 of the Present Invention (α-β>
0) In the frame 6 to which the aperture grill 5 is welded
It moves in the positive direction of the Z-axis from the tangent to the curved surface of the first end.
Therefore, the conventional damper spring extension structure (α-β
As shown in <0), the outermost aperture grill tape 5a is not twisted by the damper wire 9. Therefore, even if the temperature of the damper wire 9 rises during the subsequent heating step and thermal expansion occurs, the aperture grill tape 5a does not undergo thermoplastic deformation while being twisted. Therefore, when the temperature falls after the end of the heating step, the damper wire 9 thermally contracts accordingly, and when the damper spring 12 returns to the original shape or a shape close thereto, the damper wire 9 is not lifted. Therefore, the aperture grill 5 can be pressed to the end by the damper wire 9.

As described above, in the stretched structure of the first embodiment, α-β
Although the case where it is designed to be> 0 has been described, similar effects can be obtained even when α−β = 0 is set as shown in FIG. In short, the tensioning structure of the damper spring of the present invention only needs to be configured so that α−β ≧ 0.

Embodiment 2 FIG. FIG. 6 is a sectional view showing a damper spring spanning structure according to a second embodiment of the present invention. The same reference numerals as in FIG. 1 denote the same parts.

Here, the damper spring 12 is not directly welded to the frame 6 or the clip 10 but is welded to a spacer 13 made of a rigid body which has been welded to the frame 6 or the clip 10 in advance. Other configurations are the same as those of the first embodiment.

According to the second embodiment, the first embodiment
Similarly, the aperture grill 5 can be pressed to the end by the damper wire 9 without the twisting of the outermost aperture grill tape 5a due to the thermoplastic deformation during the heating process. In addition, the distance from the frame 6 to the fixed position of the damper spring 12 is
3, the damper spring 12 bends more than in the first embodiment. Therefore, compared with the structure of the first embodiment, the damper spring 12 can be more easily attached to the frame 6 in a state where α−β ≧ 0 is satisfied.

[0035]

Since the present invention is configured as described above, it has the following effects.

According to the first to third aspects of the present invention, the angle between the Z axis of the color selection mask and the tangent at the curved surface end of the frame is defined as α, and the angle with respect to the longitudinal direction of the damper spring at the junction with the damper line. Since the angle formed by the normal with respect to the Z axis and the angle having an isotopic relationship with the angle α is β, the configuration is such that α−β ≧ 0.
There is no possibility that the damper wire twists the outermost aperture grill tape, and the color selecting function can be stably and appropriately exerted.

In particular, by attaching the damper spring to the frame of the color selection mask via the spacer,
The damper wire can be stretched without impairing the function of the damper wire.

In the color cathode ray tube according to the fourth aspect of the present invention, even if the color cathode ray tube is vibrated, the vibration of the aperture grill is attenuated in a short time, so that the color shift can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a damper spring spanning structure according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a color CRT.

FIG. 3 is a perspective view showing an aperture grill type color selection mask.

FIG. 4 is a diagram showing definitions of a tangent line, a normal line, angles α and β, and a welding angle γ of a damper spring.

FIG. 5 is a sectional view showing a moving direction of a tip end of a damper spring.

FIG. 6 is a sectional view showing a damper spring spanning structure according to a second embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a conventional damper spring spanning structure.

FIG. 8 is a sectional view showing a deformed state of a conventional damper spring.

[Explanation of symbols]

1 panel, 2 funnel, 3 neck tube, 4
Electron gun, 5 aperture grille, 5a endmost aperture grille tape, 6,61 frame, 7
Color selection mask, 8 magnetic shield, 9 damper wire, 10 clip, 11 spring, 12
Damper spring, 13 spacer.

Claims (4)

[Claims] 1. A damper spring for attaching a damper wire to a frame of a color selection mask having a predetermined curved surface, wherein a vibration of an aperture grill constituting the color selection mask is suppressed by the damper wire. In the tension structure of the spring, an angle on an obtuse angle side formed by a Z axis of the color selection mask and a tangent line at a curved surface end of the frame is α, and a method with respect to a longitudinal direction of the damper spring at a joining point with the damper line. The angle that the line makes with the Z axis,
When an angle having a relationship between the angle α and the isotope angle is β,
A suspension structure for a damper spring, wherein α-β ≧ 0. 2. The suspension structure for a damper spring according to claim 1, wherein the damper spring is attached to a frame of the color selection mask via a spacer. 3. The suspension structure of a damper spring according to claim 2, wherein the spacer is made of a rigid body. 4. A color cathode ray tube comprising the suspension structure of the damper spring according to claim 1.