KR200198837Y1 - Mask Frame for Color Cathode Ray Tubes - Google Patents

Abstract

When welding the mask frame and the shadow mask, the curvature change of the shadow mask occurs due to the gap between these parts, which is represented by the spring back phenomenon of the shadow mask. A mask frame for preserving a shadow mask assigned to a phosphor of the present invention in a posture facing the phosphor, wherein the long side of the mask frame main body 20 makes surface contact with a skirt portion of the shadow mask 30. Provided is a mask frame for a color cathode ray tube on which slopes 26 and 28 are formed.

Description

Mask Frame for Color Cathode Ray Tubes

1 is a perspective view of a mask frame according to the present invention.

2 is a side cross-sectional view of the mask frame according to the present invention.

3 is a state diagram before the shadow mask is welded to the mask frame according to the present invention.

4 is a view for explaining the relationship before the conventional mask frame and the shadow mask is welded.

5 is a side cross-sectional view of a panel portion of a general color cathode ray tube.

* Explanation of symbols for main parts of the drawings

20: mask frame body 22: long side

24: short side 26, 28: slope

30: shadow mask

[Industrial use]

The present invention relates to a mask frame for a color cathode ray tube, and more particularly, to a mask frame capable of minimizing deformation of a shadow mask caused by opening a welding portion when welding a shadow mask to a mask frame.

[Prior art]

The color cathode ray tube has a necro shape that includes a panel coated with phosphors, a panel which is sealed to the rear opening side of the panel, and a deflection means is located on the outside, and an electron gun that emits an electron beam.

The panel is provided with a color screening means to allocate electron beams emitted from the electron gun and deflected forward, backward, left and right by the deflecting means to respective phosphors.

This so-called shadow masking means, which is called shadow mask, is positioned inside the panel in a position opposite to the fluorescent surface. For this purpose, a shadow mask is attached to the mask frame suspended inside the panel by welding or the like.

FIG. 5 shows a cross-sectional side view of a conventional panel portion, wherein a mask frame 4 is provided inside a skirt portion of the panel 2 through a stud pin, and a shadow mask 6 is provided on the mask frame 4. It is.

In the shadow mask 6, the slit through which the zyme passes is not formed in the peripheral portion attached to the mask frame 4, but numerous slits are formed in all other parts.

These slits are positioned in a position opposite to the phosphors applied to the inner surface of the panel 2 so that the electron beams are landed on the respective phosphors. Therefore, it is necessary to minimize the change in the pore portion of the shadow mask.

[Problems to Be Solved by the Invention]

Since the mask frame structure having the above structure is made of a relatively thick metal, the shadow mask is made of a thin plate, and therefore, the attachment position thereof must be taken into account in manufacturing these parts.

However, since the shadow mask is a thin metal plate, when the shadow mask is formed, the skirt part causes spring back phenomenon, and thus a gap is formed between the mask frame 4 and the skirt part of the shadow mask 6 as shown in FIG. .

However, since the portions where the gap is formed become the welding positions of these parts, the welding electrodes are forced to weld while pushing the open portions of the shadow mask.

This work method generates a force to pull the periphery of the shadow mask outwards, so that deformation occurs in the perforations of the shadow mask.

[Means to solve the problem]

The present invention has been made to solve the problems of the prior art as described above, the object of the present invention is to provide a mask frame for the color cathode ray tube that can prevent the change of the hole portion of the shadow mask even if the spring back phenomenon of the shadow mask. It is.

In order to achieve the above object, a mask frame which is suspended inside a panel and which can assign a shadow mask for assigning an electron beam to each phosphor can be preserved in an attitude opposite to the phosphor. On the long side, a mask frame for a color cathode ray plate is provided, which has an inclined surface for making surface contact with the skirt portion of the shadow mask.

EXAMPLE

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

1 is a perspective view of a mask frame according to the present invention, 2 is a side cross-sectional view, the mask frame body 20 has a substantially rectangular shape, one side of the long side 22 and the short side 24 is inclined surface 26 (28).

The inclined surfaces 26 and 28 are formed up to a position corresponding to half of the side of the mask frame body 20, and these inclined surfaces are formed at the front end portion of the mask frame to be in contact with the skirt portion of the shadow mask. have.

FIG. 3 shows a state where the shadow mask 30 is in contact with the mask frame body 20 formed as described above before welding. The shadow mask 37 has a spring back phenomenon, but the skirt portion is opened to the outside. 26) (28), since the flattened portions come into contact with the outside, these portions are substantially in surface contact.

That is, the side of the mask frame main body and the skirt of the shadow mask are kept in contact without forming a gap.

Therefore, when these parts are welded through the welding means is fused and fixed in the contact state, the force does not act on the slit portion of the shadow mask 30 during welding.

Since it is possible to weld while preserving the perforated portion of the shadow mask as it is, it is possible to prevent the deformation caused by the force generated in the perforated portion by forming a gap as in the conventional.

[effect]

As described above, the mask frame according to the present embodiment forms an inclined surface at the portion to be attached to the shadow mask so as to make a surface contact with the skirt portion of the shadow mask. Therefore, in particular, the force received during the resistance welding is transmitted to the pore side. Therefore, the curvature deformation of the slit portion through which the electron beam passes can be prevented.

Claims (1)

In a mask frame which is suspended inside a panel and stores a shadow mask which allocates an electron beam to each phosphor in a posture facing the phosphor, the shadow mask 30 is provided on the long and short side of the mask frame body 20. Mask frame for a color cathode ray tube, the inclined surface (26, 28) is formed to make a surface contact with the skirt portion.