KR200261886Y1 - Shadow mask frame assembly for color picture tube - Google Patents

Abstract

According to the present invention, a shadow mask; A mask frame for supporting the shadow mask; A shadow mask frame assembly for color cathode ray tubes comprising: a plurality of springs elastically supporting the mask frame with respect to the panel, wherein each of the plurality of springs comprises: a first surface having a stud pin insertion hole formed therein; A shadow mask frame assembly for a color cathode ray tube is provided, comprising a second face bent at an acute angle and a third face bent at an acute angle with respect to the second face and welded to one side of the mask frame. In the shadow mask frame assembly for a color cathode ray tube with a spring according to the present invention, even if a dominant phenomenon occurs in a shadow mask, the shadow mask may be always kept in a correct position, and thus the shadow mask may be maintained in a normal position.

Description

Shadow mask frame assembly for color cathode ray tube

The present invention relates to a shadow mask frame assembly for a color cathode ray tube, and more particularly to a shadow mask frame assembly for a color cathode ray tube for supporting a mask frame with a spring of a novel shape.

In general, the color cathode ray tube includes an outer glass member consisting of a panel portion, a funnel portion, and a neck portion, an electron gun assembly coupled to the neck portion, a shadow mask disposed inside the glass member, a shadow mask supporting frame, And a shadow mask frame assembly made of a spring or the like. In color cathode ray tubes, leaf springs are typically used to secure the assembly of the shadow mask to the stud pins fixed to one side of the panel.

1 is a side view schematically showing a color cathode ray tube. The color cathode ray tube includes an outer glass member having a panel portion 6, a funnel portion 8, and a neck portion 10, the panel portion 6 having a substantially rectangular face plate 2 and a face plate. It consists of the edge part 4 extended from the peripheral edge of (2), and the neck part 10 connected to the funnel part 8 connected to the edge 4 of the panel 6. As shown in FIG.

The inside of the glass member 1 is made to prevent air from passing through the panel 6, the funnel 8, and the neck part 10. As shown in FIG. The electron gun 11 emitting the electron beam is accommodated in the neck 10. A deflection yoke 12 that generates a magnetic field is installed on the outer surfaces of the funnel 8 and neck 10. The fluorescent surface 14 is formed on the inner surface of the face plate 2 of the panel 6.

The shadow mask 16 is disposed in the cathode ray tube 1 and faces the fluorescent surface 14 at a predetermined distance from the face plate 2. The shadow mask 16 is made of a thin metal plate, and a plurality of slit holes are formed therein. The mask frame 18 is provided around the shadow mask 16. A plurality of elastically deformable springs 20 elastically support the mask frame 18. A plurality of stud pins 22 coupled with the spring 20 are provided on the inner surface around the edge 4 of the panel 2. The mask frame 18, shadow mask 16, and springs 20 above constitute a shadow mask frame assembly. Installed on the neck side of the mask frame 18 is an inner shield 24, which prevents the electron beam from the electron gun 11 from being affected by the magnetic field.

2 shows a mask frame 18 installed at the edge 4 of the panel 6. The springs 20 are respectively attached adjacent to the intermediate positions of the four sides of the mask frame 18. Each spring 20 has the form of a metal plate welded to the mask frame 18 and is typically formed of a bimetallic material.

As described above, the spring 20 is welded to the mask frame 18 in an electrical resistance welding manner. However, using the spring 20 of the shape described in FIGS. 1 and 2 often causes the mask frame 18 to rotate from its normal position. This is because the position at which one end of the spring 20 is welded to the mask frame 18 and the position at which the other end is fastened to the stud pin 22 of the panel 6 are mutually biased, that is, the welding position of the spring is masked. This is because the correction force is not evenly distributed because it is out of the center of the frame 18. Although the pair of springs 20 are arranged on opposite sides of the mask frame 18 so that the position of the mask frame 18 is normally maintained, the mask is not correct if the welding position of the spring 20 is not correct. The frame 18 is likely to rotate. When the mask frame 18 is rotated, the shadow mask 16 coupled thereto is also rotated, so that a defect occurs when the beam incident from the electron gun 11 lands at a predetermined position of the fluorescent surface.

As another problem, the welding area between the mask frame 18 and the spring 20 is small, so that the transfer of the correction force is small. Moreover, the use of bimetallic materials raises costs.

The present invention has been made to solve the above problems, an object of the present invention to provide a shadow mask frame assembly for a color cathode ray tube for supporting the mask frame with a spring of a novel shape.

1 is a schematic side cross-sectional view of a color cathode ray tube according to the prior art;

FIG. 2 is a front sectional view of the color cathode ray tube shown in FIG. 1. FIG.

Figure 3 is a front sectional view of the color cathode ray tube according to the present invention.

Figure 4 is a perspective view of the spring provided in the color cathode ray tube according to the present invention.

5 is a cross-sectional view taken along the line V-V of FIG. 3.

<Brief Description of Major Codes in Drawings>

6. Panel 8. Funnel

10. Neck 11. Electron gun

12. Deflection York 16. Shadow Mask

18.mask frame 22.spring

31.Spring 32.Stud Pins

36. Shadow Mask 38. Mask Frame

41. Welded part 42. Stud pin insertion hole

In order to achieve the above object, according to the present invention, a shadow mask; A mask frame for supporting the shadow mask; In the shadow mask frame assembly for a color cathode ray tube comprising: a plurality of elastic members for elastically supporting the mask frame against the inner side of the panel, each of the plurality of springs, the first surface is formed with a stud pin insertion hole, and the first A shadow mask frame assembly for a color cathode ray tube is provided, comprising a second face bent at an acute angle with respect to the face, and a third face bent at an acute angle with respect to the second face and welded to one side of the mask frame. .

According to another feature of the present invention, each of the plurality of springs is welded to the central portion of each side of the mask frame.

Hereinafter, the present invention will be described in detail with reference to an embodiment shown in the accompanying drawings.

3 shows a shadow mask frame assembly with a mask frame 38 installed at the edge 34 of the panel in a color cathode ray tube according to the present invention.

Referring to the drawings, the mask frame 38 is elastically supported by the springs 31 on three surfaces except for the bottom of the square shape. The spring 31 is supported by a stud pin 32 formed at one side of the panel edge 34 and fixed at the other side in a welded state to the mask frame 38. As can be seen from the figure, the point where the spring 31 is welded to the mask frame 38 corresponds to the center of each side of the mask frame 38. Mask frame 38 supports shadow mask 36.

4 is a schematic perspective view of the shape of the spring shown in FIG. 3.

Referring to the drawings, the spring 31 has a first surface 51 having a stud pin insertion hole 42 formed therein, a second surface 52 bent at an acute angle with respect to the first surface 51, and the first surface 51 formed thereon. A third surface 53 is bent at two angles and welded to the mask frame 38. The stud pin 32 formed at the edge 34 of the panel with respect to the insertion hole 42 is inserted. It is preferable that the third surface 53 formed as a welding surface is as wide as possible, which is advantageous for the large area of the third surface 53 to distribute the correction force due to the elasticity of the spring uniformly with respect to the mask frame 38. Because.

FIG. 5 is a cross-sectional view taken along the line V-V in FIG. 3.

Referring to the drawings, a third surface of the spring 31 is welded to the side surface of the mask frame 38, and the stud pin 32 is inserted into the insertion hole 42 formed in the first surface 51 of the spring 31. It can be seen that the second face 52 of the spring 31 extends between the first face 51 and the third face 53. With this structure, when the shadow mask 36 (FIG. 3) fixed to the mask frame 38 causes a dorming phenomenon by the hot electrons generated in the electron gun, the spring 31 has its own elastic force and the mask frame ( The change in the position of 38) can be corrected. This correction force acts in the A and B directions indicated by the arrows so as to correspond to the positional change of the mask frame 38. In addition, the spring 31 may be manufactured using an elastic material, and may be made of a material other than bimetal.

In the shadow mask frame assembly for a color cathode ray tube with a spring according to the present invention, even if a dominant phenomenon occurs in a shadow mask, the shadow mask may be always kept in a correct position, and thus the shadow mask may be maintained in a normal position. Therefore, the electron beam can be incident exactly on the fluorescent surface, and the image quality is guaranteed. In addition, since the spring is installed at the center of each side of the mask frame, it is easy to manufacture, less likely to cause defects, and has the advantage of reducing the manufacturing cost.

Although the present invention has been described with reference to one embodiment shown in the drawings, it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention should be defined only by the appended claims.

Claims (2)

A shadow mask; A mask frame for supporting the shadow mask; A shadow mask frame assembly for a color cathode ray tube comprising: a plurality of springs elastically supporting the mask frame with respect to a panel, Each of the plurality of springs may include a first surface having a stud pin insertion hole, a second surface bent at an acute angle with respect to the first surface, and bent at an acute angle with respect to the second surface and welded to one side of the mask frame. A shadow mask frame assembly for a color cathode ray tube, comprising a third side. The shadow mask frame assembly of claim 1, wherein each of the plurality of springs is welded to a central portion of each side of the mask frame.