KR20020021713A - Shadow mask frame assembly and for flat type CRT therewith - Google Patents

Abstract

According to the present invention, the first and second support members spaced apart from each other by a predetermined interval, and a frame having first and second elastic members, each end of which is fixed to one end of each of the first and second support members; 10. A shadow mask frame assembly for a planar cathode ray tube comprising: a flat shadow mask supported by said first and second support members under tension and having a plurality of slits through which an electron beam passes; wherein said first and second supports And a shielding frame in which the first and second support members and the first and second elastic members are provided therein so as to surround the member, and the periphery of the first and second elastic members. A shadow mask frame assembly and a cathode ray tube having the same are provided.

Description

Shadow mask frame assembly and flat cathode ray tube having the same {Shadow mask frame assembly and for flat type CRT therewith}

The present invention relates to a shadow mask frame assembly and a flat cathode ray tube having the same, and more particularly to a shadow mask frame assembly having a shielding frame capable of blocking the influence of the earth's magnetic field, and a flat cathode ray tube having 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 and the support member 11. The frame 10 having the first and second elastic members 13 and 14 which maintain the spacing between the edges 12 and 12 is welded to the support members 11 and 12 at the edge, that is, the long side part side. 21 is provided with a flat shadow mask 20 in which slits 22 on the stripe 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 on both sides and displacing the first and second support members 11 and 12 in a direction in which they are close to 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 the intermediate part of the 1st support member 11 and the 1st elastic member 13 through the base 26. As shown in FIG. 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 23 (not shown) formed inside the panel of the cathode ray tube so that the shadow mask frame assembly can be supported inside the panel. do.

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

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 inner shield 31 is welded to the rear ends of the first and second elastic members 13 and 14, so that the shielding of the earth's magnetic field is insufficient. There is this. That is, the portion corresponding to the height of the first and second support members 11 and 12 and the first and second elastic members 13 and 14 from the surface of the shadow mask 20 (indicated by h in FIG. 1). Part) is not wrapped by the inner shield 31, so that the shielding of the earth's magnetic field is not made.

The present invention has been made to solve the above problems, an object of the present invention is to provide a shadow mask frame assembly that can achieve a more complete shielding of the Earth's magnetic field.

It is another object of the present invention to provide a planar cathode ray tube with a shadow mask frame assembly capable of more fully shielding the earth's magnetic field.

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

<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 distance, and the first and second elasticity, each of which is fixed at both ends at one end of the first and second support members, respectively. A frame having a member; 10. A shadow mask frame assembly for a planar cathode ray tube comprising: a flat shadow mask supported by said first and second support members under tension and having a plurality of slits through which an electron beam passes; wherein said first and second supports And a shielding frame in which the first and second support members and the first and second elastic members are provided therein so as to surround the member, and the periphery of the first and second elastic members. A shadow mask frame assembly is provided.

According to another feature of the invention, the thickness of the shield frame member (h) is a shadow equal to or greater than the height (h ') from the surface of the shadow mask to the rear end of the first and second elastic members A mask frame assembly is provided.

In addition, according to the present invention, the first and second support members spaced apart from each other by a predetermined interval, the first and second support member frame having a first and second elastic members having both ends fixed to one end of each of the second support member and ; 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 flat cathode ray tube comprising: a bulb having a panel provided therein, wherein the frame is wrapped around the first and second support members and the periphery of the first and second elastic members. A shielding frame in which the first and second support members and the first and second elastic members are installed therein; And a spring having one end welded to the periphery of the shield frame and the other end formed with a hole, wherein a stud formed on the inner side of the panel with respect to the hole of the spring is inserted therein. A planar cathode ray tube is provided.

According to another feature of the invention, the inner shield is joined to the rear end of the shield frame.

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 hook and a spring provided in the 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. The shadow frame assembly according to the present invention has the first and second support members 11 and 12 installed in parallel with each other, and both ends of the first and second support members 11 and 12 are fixed at both ends thereof to support the support member 11, First and second elastic members (13, 14) for maintaining the interval of 12) is provided. 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, the shadow mask 20, the first and second support members 11 and 12, and the first and second elastic members 13 and 14 are shielded frames ( 41) is installed inside. As shown in the drawing, the shield frame 41 includes the shadow mask 20, the first and second support members 11 and 12, and the first and second elastic members 13, 14) has a height enough to completely cover its rim when installed in it. That is, h 'indicating the thickness of the shield frame 41 in FIG. 3 must be at least equal to or greater than h, the length from the surface of the shadow mask 20 to the bottom of the elastic members 13 and 14. do.

The spring 49 is welded to the outer peripheral surface of the shield frame 41. The spring 49 has one end welded to the outer circumferential surface of the shield frame 41, and the other end configured as the free end is coupled to the stud 33 of the panel 2 as shown in FIG. 4.

4 is a cross-sectional view schematically showing that the shadow mask frame as shown in FIG. 3 is installed in the bulb of the cathode ray tube. In Fig. 4, the same numerals as in Fig. 2 denote the same components.

Referring to the drawings, the first and second support members 11 and 12 and the first and second elastic members 13 and 14 are provided inside the shield frame 41. And it can be seen that the periphery of the elastic members are completely wrapped by the shield frame (41). In addition, it can be seen that the inner shield 31 is welded to the rear end of the shield frame 41. As a result, the shielding effect of the earth's magnetic field can be obtained by the inner shield 31 and the shield frame 41 until the electron beam is incident from the electron gun 32 and passes through the electron beam passing hole of the shadow mask 20.

The shadow mask frame for the cathode ray tube and the planar cathode ray tube having the same according to the present invention have the effect of shielding the earth's magnetic field more completely by being provided with a shield frame. Therefore, since the electron beam from the electron gun can be landed on the fluorescent film without being affected by the earth magnetic field, the image quality is 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 will be defined by the technical spirit of the appended claims the true technical protection scope of the present invention.

Claims (4)

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 shadow mask frame assembly for a planar cathode ray tube comprising: a flat shadow mask supported by the first and second support members in a state where a tensile force is applied and a plurality of slits through which an electron beam passes; The first and second support members and the first and second elastic members are disposed therein so as to surround the first and second support members and the peripheral portions of the first and second elastic members. The shadow mask frame assembly further comprises a shield frame for installation. The thickness h of the shield frame member is equal to or greater than the height h 'from the surface of the shadow mask to the rear ends of the first and second elastic members. Shadow mask frame assembly. 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 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 flat cathode ray tube comprising: a bulb having a panel installed therein; The first and second support members and the first and second elastic members are disposed therein so as to surround the first and second support members and the peripheral portions of the first and second elastic members. A shield frame installed; And a spring having one end welded to the periphery of the shield frame and the other end formed with a hole. And a stud formed in the inner surface of the panel with respect to the hole of the spring is inserted therein. The planar cathode ray tube according to claim 3, wherein an inner shield is joined to a rear end of the shield frame.