KR100319092B1 - Shadow Mask Frame Assembly for Color Cathode Ray Tube - Google Patents

Abstract

The disclosed shadow mask frame assembly for cathode ray tube includes a shadow mask having a plurality of electron beam through holes formed therein, a skirt extending vertically downward from an edge of the hole, and a support portion coupled with the skirt portion of the shadow mask. The present invention relates to a shadow mask frame assembly having a colored cathode ray frame provided with a frame, the tensioning means being provided between the skirt portion of the shadow mask and the support portion of the frame to pull the short side of the shadow mask toward the short side of the frame during initial doming of the shadow mask. It is characterized in that it is provided, which has the advantage that the initial screen can be stabilized by compensating the shadow mask dominant amount initially.

Description

Shadow Mask Frame Assembly for Color Cathode Ray Tube

The present invention relates to a color cathode ray tube, and more particularly, to a shadow mask frame assembly installed inside the panel and having a color discrimination function.

Typically, the color cathode ray tube is provided with a panel 10 having a fluorescent film 11 formed on its inner surface as shown in FIG. 1, and spaced apart from the fluorescent film 11 by a predetermined distance within the panel 10. A shadow mask frame assembly 20 having a mask 21, a frame 22 supporting the same, and an inner shield 23 fixed to the frame 21, and the neck part 31 being sealed to the panel 10. ) And a funnel 30 in which an electron gun 40 is sealed and a deflection yoke 50 is provided in the cone portion 33.

In the color cathode ray tube configured as described above, the electron beam emitted from the electron gun 40 mounted on the neck portion 31 is selectively deflected by the deflection yoke 50 so as to pass through the electron beam of the shadow mask 21 having a color selection function. It passes through the ball and lands at each fluorescent point of the fluorescent film 11 to form an image. As described above, the electron beams emitted from the electron gun 40, that is, the hot electrons, do not pass all the electron beams emitted from the electron gun 40 in the course of passing through the electron beam passing holes of the shadow mask 21, and only 15% to 18% pass. The remainder is landed in the shadow mask and lost as heat. Therefore, as shown in FIG. 2, the shadow mark 21 and the frame 22 supporting the heat are heated and thus are accompanied with thermal expansion, which is caused by thermal expansion of the shadow mask 21 and the frame 22. The shadow mask 21 supported by (22) causes a domming phenomenon. Therefore, the electron beam through hole 21a formed in the shadow mask is transferred relative to each pixel of the fluorescent film formed on the inner surface of the panel. This phenomenon prevents the electron beam emitted from the electron gun 40 from landing at the fluorescent point of the fluorescent film 11 accurately.

In order to solve this problem, the shadow mask frame assembly 20 is conventionally heated by combining a hook spring using a bimetal principle as a support in coupling with a stud pin (not shown) formed on the inner surface of the panel 10. The shadow mask frame assembly is moved to the side of the fluorescent film to compensate for the doming phenomenon.

However, as described above, the compensation of the dominant phenomenon of the shadow mask due to thermal expansion of the shadow mask frame assembly is that since the shadow mask 21 is primarily heated, the frame 22 supporting the heating is heated and the hook spring is heated. There was a problem in that it took a long time for the (25) to be heated to compensate for the dope phenomenon. That is, as shown in FIG. 3 and FIG. 4, the initial thermal expansion amount of the shadow mask and the spring is relatively large and the thermal expansion amount of the frame is relatively small. Therefore, the initial stabilization time of the cathode ray tube is relatively long.

The present invention was created in order to solve the above problems, and the compensation due to thermal expansion of the shadow mask is primarily made before compensating the dominant phenomenon of the shadow mask, so that a color cathode ray can be used to shorten the stabilization time of the initial screen. It is an object of the present invention to provide a shadow mask frame assembly.

The present invention to achieve the above object,

A shadow mask for use with colored cathode rays, comprising a shadow mask including a hole portion formed with a plurality of electron beam through holes, a skirt portion extending vertically downward from an edge of the hole portion, and a frame having a support portion coupled to the skirt portion of the shadow mask. In the mask frame assembly,

It is installed between the skirt of the shadow mask and the support of the frame is characterized in that it comprises a tension means for pulling the short side of the shadow mask to the short side of the frame during the initial doming of the shadow mask.

The tension means is characterized in that it is made of a bimetal that is thermally deformed by the heat transferred from the shadow mask to apply a tensile force to the shadow mask.

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

The shadow mask frame assembly for a color cathode ray tube according to the present invention is sealed with a fennel 30 having an electron gun 40 and a deflection yoke 50 installed in the neck and cone portions as shown in the first, and a fluorescent film on the inner surface thereof. It is fixed to the interior of the panel 10 is formed 11, as shown in Figs. 5 and 6, the hole portion 71 is formed with a plurality of electron beam through hole (71a) and this hole portion ( A shadow mask 70 having a skirt portion 72 bent in a vertical direction from an edge of the edge 71, and a skirt portion 72 of the short side portion of the shadow mask 70 and a plurality of tensioning means 100. It is comprised with the frame 80 in which the support part 81 was provided. Here, the long side skirt portion of the shadow mask 70 is spot welded at least two places with the long side portion support portion of the frame 80, as shown in FIG.

The tension means 100 is composed of a plurality of bimetals 101 that connect the short side support portions of the frame 80 of the skirt portion 72 of the shadow mask 70. The bimetal 101 is typically made of a high thermal expansion member and a low thermal expansion member. When the bimetal 101 is thermally expanded by the shadow mask 71, the bimetal 101 is formed in the outward direction of the frame 80 so that the bimetal 101 is formed in the shadow mask. Preferably, the short side skirt portion and the high thermal expansion member are joined to each other, and the low thermal expansion member side is connected to the short side support portion of the frame. And another embodiment of the tension means is preferably made of a material having a thermal expansion coefficient less than the shadow mask 70 to draw the short side of the shadow mask to the frame side when the shadow mask 70 is heated, the tension The material of the means can be any material that can pull the shadow mask to the frame side relatively during thermal expansion.

Referring to the operation of the shadow mask frame assembly for a color cathode ray tube according to the present invention configured as described above are as follows.

In the shadow mask frame frame assembly according to the present invention mounted on the color cathode ray tube, hot electrons, which are electron beams emitted from the electron gun, do not pass through all of the electron beam passing holes 70H of the shadow mask 70, as shown in FIG. A portion is landed in the shadow mask 70, so that the shadow mask 70 is heated. Therefore, the shadow mask 70 is thermally expanded, and as shown in FIGS. 8 and 9, the shadow mask 70, the tensioning means 100, the spring, and the frame 80 are thermally thermally expanded by being sequentially heated. As a result, the doming phenomenon is generated as shown in FIG. However, since the skirt portion 72 of the short side portion of the shadow mask 70 is supported by the tensioning means 100 with respect to the support portion 81 of the frame 80, the initial domming amount can be compensated in a short time. Can reduce the amount of dominance relatively.

That is, since the bimetal 101, which is the tensioning means 100, is provided between the short side portion skirt portion 72 of the shadow mask 70 and the end portion side support portion 81 of the frame 80, the shadow mask 70 As the bimetal 101 is heated before heat due to heating is conducted to the frame 80, the shadow is caused by the difference in thermal expansion of the bimetal 101 made of the low thermal expansion member and the high thermal expansion member as shown in FIG. The short side portion of the mask 70 is pulled out to compensate for the dominant amount of the shadow mask. At this time, pulling the skirt side of the short side portion of the shadow mask 70 to the outside may obtain the effect of pulling the domed portion toward the frame side.

By the above operation, the initial masking phenomenon of the shadow mask is compensated, and further, the stabilization time of the initial screen formed on the cathode ray tube can be shortened. That is, as described above, the correction of the dominant phenomenon of the shadow mask by the bimetal is as shown in FIG. 11 (the graph shown by the dotted line is the initial dose amount of the conventional shadow mask and the graph shown by the solid line is according to the present invention. It is understood that the initial masking amount of the shadow mask is made within a very short time than the time compensated by the hook spring.

As described above, the present invention color cathode ray shadow shadow frame frame assembly can initially compensate for the dominant amount due to thermal expansion of the shadow mask to prevent drift due to the movement of the electron beam through hole, and further, the initial stabilization time of the image. Can be shortened and the resolution of the image can be improved.

1 is a cross-sectional view of a typical color cathode ray tube,

2 is a cross-sectional view showing a conventional shadow mask frame assembly,

Figure 3 shows the thermal expansion of the shadow mask frame assembly over time.

4 is a view showing the doping amount of a conventional shadow mask,

5 is an exploded perspective view illustrating a state in which a shadow mask according to the present invention is supported by a tensioning means in a frame;

6 is a cross-sectional view of the shadow mask frame assembly according to the present invention cut into the long side,

7 is a cross-sectional view of the shadow mask frame assembly according to the present invention cut into a short side;

8 is a view showing a thermal expansion amount of the shadow mask frame assembly according to the present invention over time,

9 is a view showing the dominant amount of the shadow mask according to the present invention;

10 is a view schematically showing a state in which a dominant amount of a shadow mask is compensated for;

11 is a graph showing the relationship between the amount of dominance and time.

* Brief description of symbols for the main parts of the drawings

70: shadow mask 80: frame

100: tensioning means

Claims (5)

A shadow mask for use with colored cathode rays, comprising a shadow mask including a hole portion formed with a plurality of electron beam through holes, a skirt portion extending vertically downward from an edge of the hole portion, and a frame having a support portion coupled to the skirt portion of the shadow mask. In the mask frame assembly, The shadow mask frame assembly for color cathode ray tube is provided between the skirt portion of the shadow mask and the support portion of the frame and has a tension means for pulling the short side of the shadow mask toward the short side of the frame during the initial doming of the shadow mask. . The method of claim 1, The tension means is a shadow mask frame assembly for a color cathode ray tube, characterized in that made of a bimetal that is thermally deformed by heat transferred from the shadow mask to apply a tensile force to the shadow mask. The method of claim 1, The shadow mask frame assembly for color cathode ray tube, characterized in that the long side skirt portion of the shadow mask is welded with at least one of the long side side support portion of the frame. The method of claim 2, The shadow mask frame assembly for a color cathode ray tube, characterized in that the bimetal connected to the short side of the shadow mask is bonded to the shadow mask and the high thermal expansion member and the low thermal expansion member side is connected to the skirt of the frame. The method of claim 1, And the tensioning means is a metal piece made of a material having a lower thermal expansion coefficient than that of the shadow mask.