KR100414482B1 - The Damper Spring Bonding Structure Of Tension Type Shadow Mask For Cathode Ray Tube - Google Patents

Abstract

The present invention relates to a welding structure of a damper spring of a color cathode ray tube.

The present invention is a panel having a fluorescent surface formed on the inner surface, a stud pin formed on the inner surface of the skirt portion of the panel, a rectangular tension type shadow mask for color discrimination, the frame for supporting the tension type shadow mask in a tensioned state and the In the color cathode ray tube including a spring connecting the stud pin and the frame so that the shadow mask is installed at a predetermined distance from the fluorescent surface of the inner surface of the panel, one side is welded to the frame corresponding to the long side or short side of the shadow mask The other side is the first damper spring is fixed to the damper wire for damping the vibration of the shadow mask and one side is welded to the frame corresponding to the long side or short side of the shadow mask facing the first damper spring and the other side is the first The second damper spring to which the damper wire connected to the damper ring of 1 is fixed. And also; At least two welding points of the first and second damper springs to the frame are characterized in that the welding points are arranged perpendicular to the extension direction of the damper wire.

Thus, the required tension can be applied to the damper wire even with less welding strength than conventional two-point welding in the longitudinal direction.

Description

Tension Type Shadow Mask Damper Spring Welding Structure for Cathode Ray Tubes {The Damper Spring Bonding Structure Of Tension Type Shadow Mask For Cathode Ray Tube}

The present invention relates to a color cathode ray tube employing a tension type shadow mask, and more particularly, to a structure in which a damper wire is welded to a damper spring in order to reduce a howling phenomenon caused by vibration of a tension type shadow mask.

Referring to the structure of a general color cathode ray tube, as shown in FIG. 1, the front glass called the panel 1 and the rear glass called the funnel 2 are combined to form a vacuum closed space, and the inner surface of the panel is red (R). ), There is a fluorescent surface 4 coated with green (G) and blue (B) phosphors to serve to emit light. An electron gun generating an electron beam 6 for emitting a fluorescent surface is coupled to the neck portion 10 of the funnel, and selects colors to emit red (R), green (G), and blue (B) phosphors, respectively. A functioning shadow mask 3 is located at regular intervals on the inner surface of the panel, and there is a frame 7 and a spring 8 for supporting the shadow mask 3 to the panel. In addition, the inner shield 9, which serves as a shield so that the cathode ray tube is less affected by the external geomagnetic field, is fixed to the frame.

And since such a cathode ray tube has a high vacuum inside, an explosion may easily occur due to an external impact, so that the panel 1 has a structural strength that can withstand atmospheric pressure. In addition, by attaching the reinforcing band 20 to the skirt of the panel 1, the stress applied to the cathode ray tube in a high vacuum state is dispersed to secure impact resistance.

Hereinafter, the operation principle of the color cathode ray tube will be described, and the fluorescent surface 4 formed on the inner surface of the panel 1 by the anode voltage applied to the cathode ray tube is formed by the electron beam 6 of the electron gun embedded in the neck of the panel 2. In this case, the electron beam is deflected up and down and left and right by the deflection yoke 5 before reaching the fluorescent surface to form the entire screen. The shadow mask, an internal part of the cathode ray tube, is the most direct part that can be damaged by external vibrations or impacts.

In particular, the cathode ray tube having a tension type shadow mask is fixed to the mainframe 13 by applying tension in one or both directions to the shadow mask, and has a weaker howling characteristic due to vibration than a general curved shadow mask having a relatively curvature. In order to suppress the vibration of the shadow mask 3 caused by the external vibration in the cathode ray tube having such a tension type shadow mask, the damping spring 14 is welded to the bidirectional subframe 12 to which tension is not applied. The damper wire 15 is fixed to both damper springs in a state where elastic force is applied to support the shadow mask surface.

However, as shown in FIG. 3, it can be seen that the welding shape of the conventional damper spring 14 is welded to two points in the longitudinal direction. This requires a greater weld strength at the top weld point 18 than at the bottom weld point 18 to apply the necessary tension to the damper wire to suppress the howling. Since the welding strength of the damper spring to maintain the tension of the damper wire 15 should be welded based on the welding strength of the upper end of the damper wire 15, the production cost is increased. In addition, since the two longitudinal points are welded, the side force (torsion moment) acting at right angles with the vertical welding point is weak, so that the welding strength for the force acting on the side is difficult to secure.

Damper springs have sufficient welding strength to prevent the tension applied to the damper wires or fall due to the action of torsional moments during production.The damper springs have a serious effect on the screen quality of the final cathode ray tube. Moving inside can cause problems such as scratches on the inner surface of the mask, resulting in deterioration of cathode ray tube quality.

Accordingly, an object of the present invention is to solve the problems of the prior art, by presenting the effective welding shape of the damper spring to secure the welding strength of the spring, and to reduce the howling caused by the vibration of the shadow mask to the damper wire It is to provide a colored cathode ray tube for application.

1 is a cross-sectional view for explaining the structure of a general flat cathode ray tube,

2 is a view showing a state in which a damper wire is mounted on the damper spring;

3 is a partially enlarged view of the damper spring of FIG. 2;

4 is a view showing a welding point structure of a damper spring according to a temporary embodiment of the present invention;

5a and 5b is a view showing a welding point structure of a damping spring according to another embodiment of the present invention,

6A and 6B are diagrams showing a conventional damper spring structure and the damper spring structure of the present invention, respectively.

*** Explanation of symbols for the main parts of the drawing ***

1: panel 2: funnel

3: shadow mask 4: fluorescent surface

5: deflection yoke 6: electron beam

7: frame 8: spring

9: Inner Shield 10: Neckbu

12: subframe 13: mainframe

14: damper spring 15: damper wire

Technical means of the present invention for achieving the above object is a panel formed with a fluorescent surface on the inner surface, a stud pin formed on the inner surface of the skirt portion of the panel, a rectangular tension type shadow mask to perform the color discrimination function, the tension type shadow mask In the color cathode ray tube comprising a frame for supporting the frame and the shadow mask is provided with a tension and a spring connecting the stud pin and the frame so as to be installed at a predetermined distance from the fluorescent surface of the inner surface of the panel, one side of the shadow mask A first damper spring welded to a frame corresponding to a long side or a short side, and the other side of which a damper wire is fixed to attenuate vibration of the shadow mask, and one side of which is a long side or a short side of a shadow mask opposite to the first damper spring. Is welded to a frame corresponding to the other side and connected to the first damper ring. It includes a damper spring of the second damper is fixed, and the wire; At least two welding points of the first and second damper springs to the frame are characterized in that the welding points are arranged perpendicular to the extension direction of the damper wire.

In addition, the welding points may be three or four, and connecting the welding points may form a triangle or a quadrangle, respectively.

When the welding point radius is R and the width of the damping spring is L, the welding point pitch Ph of the damping spring satisfies the following formula, L / 5 <Ph ≤3L / 5, and the welding point size of the damping spring (R) preferably satisfies the following formula, L / 10? R?

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 3, instead of arranging the damping spring in the frame in the longitudinal direction, that is, in the extending direction of the damper wire, as shown in FIG. 4, the configuration of the present invention is perpendicular to the damper wire extending direction. It is to arrange two welding points in the direction.

As shown in FIG. 6B, the lower end of the damper spring is welded to the subframe 12, and the first bent portion of the lower end contacts the subframe 12. In order to support the tension of the damper wire 15, welding is performed at the lower end. The first bending point of the lower end of the damper spring acts as a support part of the lever for the tension of the damper wire. Will support the tension of the damper wire. As shown in FIGS. 5A and 5B, in another embodiment, three-point welding or four-point welding, and connecting the welding points, may be triangular or quadrangular, respectively. In this way, the more welding points are divided, the more the force supporting the tension of the damper wire is divided, so that there is an advantage that the lower welding strength is possible.

The welding spot pitch indicating the spacing of the welding spots can ensure a strong welding strength against the vertically acting force (torsion moment). In addition, the larger the welding radius is, the greater the shear stress against the force acting on the side, thereby ensuring the weld strength resistant to torsion, the weakest point of the welding spring.

Therefore, when the welding point pitch Ph exceeds 3 / L, the reaction moment at the welding point acts as a large torsional moment at the welding point. In addition, when the welding point pitch Ph is equal to or smaller than L / 5, interference may occur between the welding points, thereby reducing the strength of the welding.

In the present invention, the welding strength necessary to maintain the tension of the damper wire to be mounted to suppress the howling, which is a vibration generated in the shadow mask, is welded vertically in the damper wire extension direction, that is, in two transverse directions. As shown in FIG. 6B, the two horizontal spots are welded to support the tension of the damper wire at the same welding strength at the left and right welding points, thereby solving the problem of unbalanced welding strength, thereby more effectively maintaining the tension of the damper wire. In addition, in the prior art, a welding strength lower than the welding strength required at the upper end welding point is required, thereby reducing production costs.

Since the two horizontal spots are welded, a larger torsional moment is required in the conventional longitudinal two spots for the lateral force (torsion moment) at the lower weld spot than at the upper weld spot. By welding, the torsional moment is divided and supported at two points, so that it is possible to apply the necessary tension to the damper wires mounted to suppress the howling even with less welding strength. Strength can be secured.

6a and 6b theoretically compare the weld strength difference in the prior art and the present invention

<Private Technology>

By the principle of equilibrium of force and moment

H × F + R1 × (h-d) + h × R2 = 0 ----------------------------- ①

R1 + R2 = F ----------------------------- ②

The above two equations come out and when the above two equations are solved together, R1 and R2, which are the welding strength of the welding point, can be obtained.

R1 = ((H + h) × F) / d ----------------------------- ③

R2 =-((H + h-d) × F) / d ----------------------------- ④

<Invention>

By the principle of equilibrium force and moment

H × F = R1 × h + R2 × h ---------------------------- ㉠

R1 = R2 ---------------------------- ㉡

The above two equations come out, and when the above two equations are solved together, R1 and R2, which are the welding strength of the welding point, can be obtained.

R1 = R2 = (H × F) / 2h ---------------------------- ㉢

For comparison of the welding strength in the prior art and the present invention, the following two equations can be obtained from the length of the damping spring currently applied.

H ≒ 4.5h ----------------------------- ⓐ

d ≒ 0.5h ----------------------------- ⓑ

Applying the above two equations quantitatively compare the welding strength in the prior art and the present invention is shown in Table 1 below.

R1 R2 Remarks Prior art 10.1F 10F Prior art R1 & R2 ≒ 4.5 The present invention R1 & R2 Invention 2.25F 2.25F

As shown in Table 1, when the present invention is applied, it can be seen that the required tension can be applied to the damper wire in order to reduce the howling with about 4.5 times less welding strength.

According to the present invention, by welding two horizontal points, a tension required for the damper wire can be applied even with a smaller welding strength than conventional two-point welding. In addition, the damper wire can be supported without unbalance welding strength between the welding points by supporting the tension with the same welding strength at two welding points in the horizontal direction.

Since the two horizontal spots are welded, a larger torsional moment is required at the lower spot welding point than the upper spot welding point in the conventional longitudinal two spots for the lateral force (torsion moment). As a result, the torsional moment is divided and supported at two points, thereby supporting the tension of the damper wire even with less welding strength.

Claims (4)

A panel having a fluorescent surface formed on its inner surface, a stud pin formed on an inner surface of the skirt portion of the panel, a rectangular tension type shadow mask for color sorting, a frame for supporting the tension type shadow mask in a tensioned state, and the shadow mask panel In the color cathode ray tube comprising a spring connecting between the stud pin and the frame so as to be installed at a predetermined distance from the inner surface of the fluorescent surface, One side is welded to a frame corresponding to the long side or short side of the shadow mask, the other side is a first damper spring is fixed to the damper wire for damping the vibration of the shadow mask and one side is a shadow facing the first damper spring A second damper spring welded to a frame corresponding to the long side or short side of the mask and the other side of which a damper wire connected to the first damper ring is fixed; And at least two welding points of the first and second damper springs to the frame, the welding points being arranged perpendicularly to the extension direction of the damper wire. The method of claim 1, 3 or 4 weld points, and connecting the weld points, respectively, to form a triangular or quadrangular cathode ray tube. The method of claim 1, When the horizontal width of the damper spring is L, the welding point pitch of the damper spring satisfies the following equation. L / 5 <weld pitch (Ph) ≤3L / 5 The method of claim 1, When the welding point radius of R, the welding spot size (R) of the damping spring is a color cathode ray tube, characterized in that the following formula. L / 10 <weld spot size (R) ≤3L / 10