KR20030054708A - Shadow mask frame assembly and for flat type CRT therewith - Google Patents

Abstract

PURPOSE: A shadow mask frame assembly and a flat type cathode ray tube having the same are provided to improve the stability of the picture quality by attenuating effectively the vibration due to the external shock. CONSTITUTION: A shadow mask frame assembly for a flat type cathode ray tube includes a frame(10), a flat shadow mask(20), a base(31), an attenuation reinforcing plate(32), and a spring(33). The frame has the first and the second support members(11,12) and the first and the second elastic members(13,14) fixed to the first and the second support members. The shadow mask is supported by the first and the second support members. A plurality of slits(22) are formed at the shadow mask pass. The base is welded into the first and the second support members or the first and the second elastic members. The attenuation reinforcing plate is welded into the base. The spring is welded into the attenuation reinforcing plate.

Description

Shadow mask frame assembly and flat cathode ray tube provided with it {Shadow mask frame assembly and for flat type CRT therewith}

The present invention relates to a shadow mask frame assembly and a planar cathode ray tube having the same, and more particularly to a shadow mask frame assembly capable of preventing the mask from shaking during vibration caused by an external impact, and a planar cathode ray tube provided with the same. It is about.

The color cathode ray tube excites these electron beams from the electron gun by landing on the red, green, and blue phosphors of the fluorescent film formed on the screen surface of the panel through the electron beam through holes of a shadow mask having a color screening function. To form an image. In recent years, such a color cathode ray tube pursues flattening of a screen surface, and thus, a shadow mask must also be flattened away from a conventional curved shape, and the planar mask deforms from a planar shape by a dominant phenomenon during operation of the cathode ray tube. , Production is not easy.

1 is a schematic perspective view of an example of the shadow mask frame assembly for the flat color cathode ray tube.

Referring to the drawings, the shadow frame assembly is fixed to both ends of the first and second support members 11 and 12 and the first and second support members 11 and 12 that are installed in parallel to each other. With respect to the frame 10 including the first and second elastic members 13 and 14 which maintain the gap between the support members 11 and 12, and the first and second support members 11 and 12. As the edges are welded, a plurality of strips 21 are provided with a flat shadow mask 20 in which slits 22 are formed by being spaced a predetermined distance apart. The flat strips 21 are connected by tie bars 23 at predetermined intervals so that the slits 22 are divided.

In order to weld the flat shadow mask to the frame 10 is subjected to the following process. First, the first and second elastic members 13 and 14 are elastically deformed by pressing the first and second support members 11 and 12 from both sides and displacing them in a direction to approach each other. In this state, both ends of the flat shadow mask 20 are welded to the first and second support members, and then the pressing force applied to the first and second support members 11 and 12 is removed. In this way, the shadow mask 20 is welded to the first and second support members 11 and 12 of the frame 10 with a predetermined elastic force.

On the other hand, the spring 27 is welded to one side of the first support member 11 and the first elastic member 13 through the base 26. The base 26 and the spring 27 constitute a spring assembly 9. Although not shown in the drawings, the base and the springs may be attached to the second support member 12 and the second elastic member 14. A hole 28 is formed at the free end of the spring 27, which fits into a stud 33 (FIG. 2) formed inside the panel of the cathode ray tube, allowing the shadow mask frame assembly to be supported inside the panel. .

2 is a cross-sectional view schematically showing that the shadow mask frame assembly shown in FIG. 2 is installed in a bulb of a cathode ray tube.

Referring to the drawings, a stud 33 is formed on the inner surface of the panel 2 of the bulb 1, and holes 28 of the spring 27 welded to the first and second support members 11 and 12. The stud 33 is inserted therein so that the shadow mask frame assembly is installed on the inner surface of the panel 2. On the other hand, the inner shield 31, which has a function of shielding the earth magnetic field during operation of the cathode ray tube, has a rear end of the first and second elastic members 13 and 14 (i.e., a portion near the electron gun 32). It is installed in the welded state. The electron gun 32 is inserted into the neck 3 of the bulb 1.

In the planar cathode ray tube having the shadow mask frame assembly as described above, the external impact applied to the planar cathode ray tube causes the spring 27, the base 28, and the first and second support members 11 and 12 to restrain. Through the shadow mask 20 is passed through. Since the shadow mask 20 is formed with the slits 22 by a plurality of strips 21 spaced apart from each other as described above, the strip 21 vibrates when an external impact is applied. Vibration of the strip 21 impairs the color discrimination function of the shadow mask.

As a method of overcoming the above problem, Japanese Patent Laid-Open No. 1999-233039 discloses a wire installed to cross a middle portion of a shadow mask to fix the strip 21 to each other. However, these wires can be observed on the display screen and negatively affect the quality of the image.

The present invention has been made to solve the above problems, it is an object of the present invention to provide a shadow mask frame assembly that can attenuate vibration during external impact.

Another object of the present invention is to provide a planar cathode ray tube in which stability of image quality is ensured by attenuating vibration during external impact.

1 is a schematic exploded perspective view of a conventional shadow mask frame assembly for a planar cathode ray tube;

FIG. 2 is a schematic cross-sectional view of a planar cathode ray tube with the shadow mask frame assembly shown in FIG. 1. FIG.

Figure 3 is a schematic exploded perspective view showing a shadow mask frame assembly for a planar cathode ray tube according to the present invention.

4 is an exploded perspective view showing an enlarged view of the base, the damping diaphragm, and the spring shown in FIG. 3;

5 is a perspective view schematically showing each position on a shadow mask.

<Brief Description of Major Codes in Drawings>

11.12. Support member 13.14. Elastic member

20. Shadow Mask 21. Strip

22.Slot 23.Tie Bar

31. Inner Shield 32. Electron Gun

33. Stud pin 41. Sealed frame

49. Spring

In order to achieve the above object, according to the present invention, the first and second support members spaced apart from each other by a predetermined interval, the first and the second end is fixed to one end of each of the first and second support members, respectively, A frame having an elastic member; A planar shadow mask supported by the first and second support members in a state where a tensile force is applied and having a plurality of slits through which the electron beam passes; and the first and second support members or the first and second elastic members. A base welded to one side of the base; A reinforcing damping plate welded to the base; It is provided with a shadow mask frame assembly for a planar cathode ray tube, characterized in that the spring is welded to the reinforcing damping plate.

According to the present invention, there is provided a first and second support members spaced apart from each other by a predetermined distance, and first and second elastic members having both ends fixed to one end portions of the first and second support members, respectively. A frame; A planar shadow mask supported with respect to the first and second support members under tension, and having a plurality of slits through which the electron beam passes; A flat cathode ray tube including: a bulb having a panel provided therein, the base being welded to one side of the first and second support members or the first and second elastic members; And a reinforcing damping plate welded to the base and a spring welded to the reinforcing damping plate, wherein one end of the spring is formed with a hole into which a stud formed inside the panel is inserted. This is provided.

According to another feature of the invention, the welding point between the base, the reinforcing damping plate and the springs coincide with each other in the direction of thickness.

According to another feature of the invention, the height S1 of the upper part measured on the basis of the welding point of the spring is smaller than the height P1 of the upper part measured on the basis of the welding point of the reinforcing damping plate (S1 <P1). ), The height S2 of the lower part measured on the basis of the welding point of the spring is set smaller than the height P2 of the lower part measured on the basis of the welding point of the reinforcing damping plate (S2 <P2).

According to another feature of the invention, the hardness of the reinforcing damping plate is greater than the hardness of the spring and the base.

According to another feature of the invention, the surface friction coefficient of the reinforcing damping plate is greater than the surface friction coefficient of the spring and the base.

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

3 is a schematic exploded perspective view of a shadow mask frame assembly according to the present invention.

Referring to the drawings, the overall structure is similar to the shadow mask frame assembly shown in FIG. 1, and the same components are denoted by the same reference numerals. In the shadow frame assembly according to the present invention, both ends of the first and second support members 11 and 12 and the first and second support members 11 and 12 that are installed in parallel to each other are fixed and supported. First and second elastic members 13 and 14 are provided to maintain the distance between the members 11 and 12. In addition, the flat shadow mask 20 to which the long side part side is welded to the support members 11 and 12 is provided. In the flat shadow mask, as described above, a plurality of strips are spaced a predetermined distance to form slits on the stripe.

According to a feature of the present invention, a base 31 is welded to one side of the first and second support members and one side of the first and second elastic members 13 and 14, and the base 31 is welded to the base 31. The damping reinforcing plate 32 is welded to it, and the spring 33 is reinforced to the damping reinforcing plate 32. A hole 34 is formed at one side of the spring 33, and the hole 34 is inserted into the stud 33 formed inside the panel of the cathode ray tube as described with reference to FIG. 2.

The damping reinforcing plate 32 is interposed between the spring 33 and the base 31 to be welded to serve to attenuate vibrations applied outside the panel of the cathode ray tube. Since the vibration generated between the spring 33 and the base 31 also occurs in the thickness direction, the characteristics of the damping reinforcement plate 32 should be considered to damp the vibration in the thickness direction. That is, since the vibration is generated through the front surface of the damping reinforcing plate 32 excluding the welding point, increasing the friction coefficient can obtain the damping effect of vibration. In addition, when the material of the damping reinforcing plate 32 itself is a material that is not affected by vibration, it is possible to suppress vibration. For example, an iron material having a high permeability is suitable as the material of the damping reinforcing plate 32. High permeability means high vibration damping. The friction coefficient of the damping reinforcing plate 32 should be larger than that of the base 31 and the spring 33, and it is preferable that the surface hardness is also large.

Referring to FIG. 4, there is shown a schematic exploded perspective view of the base 31, the damping reinforcement plate 32, and the spring 33.

Referring to the drawings, the portions marked with X in each portion are welding points. The back surface of the base 31 is welded to the support members 11 and 12 or the elastic members 13 and 14 shown in FIG. 3 at the welding point 41, and the front surface of the base 31 is welded to the welding point 42. It is welded to the damping reinforcement plate 32. The damping reinforcement plate 32 is welded to the spring 33 at the welding point 43 on both its back and front surfaces. The back surface of the spring 33 is welded to the front surface of the damping reinforcement plate 32 at the welding point 44.

As can be seen from FIG. 4, the welding points 42, 43, 44 must all be set to coincide in the direction of thickness. In addition, the upper height S1 measured on the basis of the welding point 44 of the spring 33 is the height P1 of the upper part measured on the basis of the welding point 43 of the reinforcing damping plate 32. Lower (S1 <P1) and the lower height S2 measured on the basis of the welding point 44 of the spring 33 is measured on the basis of the welding point 43 of the reinforcing damping plate 32. It is preferable to set smaller than height P2 of (S2 <P2). Thus, by forming the vertical height of the reinforcing damping plate 32 longer than the vertical height of the spring 33, the reinforcing damping plate 32 can vibrate freely, and can effectively absorb external shocks through such free vibration. It is.

The following table measures the time that is delivered to each point of the shadow mask when an external impact is applied in the conventional shadow mask frame assembly shown in FIG. 1 and the shadow mask frame assembly according to the present invention shown in FIG. It is shown.

location 1/4 point 1/2 point 3/4 point 1 point Existing structure 5.2 sec 6.8 sec 2.9 seconds 0.6 sec Improvement structure 2.6 sec 3.7 sec 1.8 sec 0.4 sec Improvement effect 50% 47% 36% 26%

In the above table, each position is a position shown with respect to the center by dividing the center and the edge of the shadow mask into four equal parts. Thus, a quarter point is the point closest to the center and one point corresponds to the edge of the shadow mask. This can be understood from the position indicated on the shadow mask shown in FIG. 5. Each time is measured in seconds and represents the duration of the vibration.

As can be seen from the table above, in the shadow mask frame assembly having the structure according to the invention, the duration of vibration is shortened by at least 26% and up to 50% at each position. Thus, it can be seen that the shadow mask frame assembly according to the present invention effectively attenuates vibration caused by external impact.

Shadow mask frame for cathode ray tube according to the present invention, and the planar cathode ray tube having the same is welded through the reinforcing damping plate when the spring is welded to the support member or the elastic member, it can effectively absorb the vibration caused by external impact Have Therefore, the image quality of a cathode ray tube can be improved.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary and will be understood by those skilled in the art that various modifications and embodiments may be made therefrom. Therefore, the present invention, therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (6)

A frame having first and second support members spaced apart from each other by a predetermined distance, and first and second elastic members having both ends fixed to one ends of the first and second support members, respectively; A planar shadow mask supported by the first and second support members in a state where a tensile force is applied, and having a plurality of slits through which the electron beam passes; A base welded to one side of the first and second support members or the first and second elastic members; A reinforcing damping plate welded to the base; And a spring welded to the reinforcing damping plate. The method of claim 1, And the welding point between the base, the reinforcing damping plate, and the springs coincide with each other in the direction of thickness. The method of claim 1, The height S1 of the upper part measured on the basis of the welding point of the spring is smaller than the height P1 of the upper part measured on the basis of the welding point of the reinforcing damping plate (S1 <P1), and is based on the welding point of the spring. The height (S2) of the lower portion measured as a shadow mask frame assembly for a cathode ray tube, characterized in that the set smaller than the height (P2) of the lower portion (P2) measured on the basis of the welding point of the reinforcing damping plate. The method of claim 1, The hardness of the reinforcing damping plate is greater than the hardness of the spring and the base, the shadow mask frame assembly for a flat cathode ray tube. The method of claim 1, The surface friction coefficient of the reinforcing damping plate is greater than the surface friction coefficient of the spring and the base, the shadow mask frame assembly for a flat cathode ray tube. A frame including first and second support members spaced apart from each other by a predetermined distance, and first and second elastic members having both ends fixed to one end portions of the first and second support members, respectively; A planar shadow mask supported with respect to the first and second support members under tension, and having a plurality of slits through which the electron beam passes; A flat cathode ray tube comprising: a bulb having a panel installed therein; And a base welded to one side of the first and second support members or the first and second elastic members, a reinforcement damping plate welded to the base, and a spring welded to the reinforcement damping plate, One end of the spring is a planar cathode ray tube, characterized in that the hole is formed into which the stud formed inside the panel is inserted.