KR100439264B1 - Shadowmask Frame of Color CRT - Google Patents

Abstract

The present invention relates to a frame for color cathode ray tubes.

The configuration of the present invention, a panel provided with a fluorescent surface on the inner surface, a funnel fused using a frit glass on the rear of the panel, a shadow mask in which the electron beam through-hole is innumerably perforated to function the color of the electron beam, and the shadow mask In the color cathode ray tube comprising a frame for supporting the frame, the frame is welded and joined by two divided pieces, the weld is located on the long side of the frame, when the length of the long side of the frame is X, the weld Is X and It is located between X. It is characterized by the above-mentioned.

Therefore, according to the present invention, by minimizing the blanking scrap formed during the manufacture of the frame to increase the utilization rate of the material to contribute to the reduction of raw material cost and productivity, as well as to increase the length of the welded part, it is strong in rigidity, The effect of minimizing the effects of the geomagnetic field due to welding can be obtained.

Description

Shadowmask Frame of Color Cathode Ray Tubes {Shadowmask Frame of Color CRT}

The present invention relates to a frame for supporting a shadow mask in a color cathode ray tube (CRT). By welding two frame segments together, the blanking scrap generated during fabrication is minimized. Therefore, the purpose is to reduce the raw material cost and improve productivity by increasing the utilization rate of the material accordingly.

Looking at the frame in the conventional color cathode ray tube as follows.

FIG. 1 is a view showing a schematic configuration of a general color cathode ray tube. The front glass of the panel 1 and the rear glass of the funnel 2 are combined, and the inner surface of the panel 1 has a fluorescent surface 4 which plays a predetermined light emitting role. ), A shadow mask (3) for screening the color of the electron gun (6), which is the source of the electron beam (6) for emitting the fluorescent surface (4), and a predetermined phosphor, and a frame assembly (7) for supporting the shadow mask (3). ) And a reinforcing band (9) wrapped around the funnel (2) to ensure safety.

In addition, the shadow mask and the frame assembly 7 are fixed to the panel 1 by a spring 8, and the inner shield 5 which serves to shield the color cathode ray tube to be less affected by external geomagnetism during operation. ) Is fixed to the frame (7).

The frame 7 is made of a frame material having a constant thickness T as shown in FIG. 2, and is composed of a single body having a length X of the long side and a length Y of the short side.

In order to produce a frame composed of a single body having a length X of the long side 10 and a length Y of the short side 11 as shown in FIG. 2, the frame material having a constant thickness T is developed in a blanking process. It is cut to the cut size, and then molded into a shape designed in a drawing process, and manufactured through a process of forming an opening 12 in the center in a piercing process. In the manufacturing process of the frame 7 of the color cathode ray tube, a large amount of scrap is generated.

In addition, due to the size of the color cathode ray tube, the size of the frame 7 is also increased in size, resulting in an increase in scrap, as well as the inconvenience of handling the frame 7 due to its size and weight.

In order to solve this problem, Korean Patent Laid-Open Publication Nos. 97-12908 and 98-18231 propose a split frame, and Korean Patent Laid-Open Publication No. 97-12908 welds two frame pieces 7 to connect them to each other. The connecting portion is positioned so that its end coincides with an extension line contacting the inner central point of the short side on the long side, and in Korean Laid-Open Patent Publication No. 98-18231, at least two or more divided pieces are arranged in such a manner that the edges are in blunt contact. It is characterized by.

However, in the conventional split frame, the welding part is welded to a portion adjacent to one corner of the shortest length of the welded part, and thus has a weak point that is very weak in the rigidity of the finished frame.

In addition, as another example to compensate for the weakness of the rigidity of the frame, US Patent 3,516,147 has proposed a method for fixing the divided pieces of the frame with a strap, US Patent 3,942,064 is characterized in that the divided pieces of the frame are overlapped and combined. .

However, the frame of the above method has a problem in that the amount of change in mis-landing is increased because the geomagnetic field is not constant when the color cathode ray tube is rotated because the coupling portion of the frame becomes thick.

Therefore, an object of the present invention is to solve the conventional problems, by combining the structure of the frame for supporting the shadow mask of the color cathode ray tube by welding two 'c' shaped split pieces, to minimize the blanking scrap during the fabrication of the frame It is possible to reduce raw materials cost and improve productivity by increasing the utilization rate of materials, and to form a frame that is strong against rigidity by forming the length of welded part as long as possible, and to provide a frame that can minimize the influence of geomagnetic field due to welding. will be.

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

Figure 2 is a view showing an integrated frame for a color cathode ray tube according to the prior art.

3 is a view showing a frame for a color cathode ray tube welded to the divided pieces according to the present invention.

4 is a cross-sectional view of the divided piece blanking according to the present invention.

5 is a cross-sectional view of the frame according to the present invention.

Figure 6 is a view showing a frame having a welded portion in accordance with the present invention.

7 is a graph showing the strength of the frame according to the position on the long side of the welded portion of the frame;

8 is a graph showing the amount of miss-landing change according to the length of the long side of the frame when rotating in the color cathode ray tube direction.

9 is a sectional view of a welded part according to the present invention.

*** Explanation of symbols for the main parts of the drawing ***

1 panel 2 funnel

3: shadow mask 5: inner shield

7: frame 10: long side of the frame

11: short side of the frame 13: welded part of the frame

The present invention for achieving the above object, the panel provided with a fluorescent surface on the inner surface, the funnel fused using a frit glass on the rear of the panel, and the electron beam passing through holes so as to color-select the electron beam countlessly In the color cathode ray tube comprising a shadow mask, and a frame for supporting the shadow mask, the frame is welded and joined by two divided pieces, the weld is located on the long side of the frame, the length of the long side of the frame When X, the welding portion X and It is located between X. It is characterized by the above-mentioned.

Another technical solution of the present invention includes a panel provided with a fluorescent surface on an inner side thereof, a funnel fused using frit glass on a rear side of the panel, a shadow mask in which electron beam through holes are innumerably perforated so as to perform color discrimination of an electron beam, and In the color cathode ray tube including a frame for supporting the shadow mask, the frame is welded and joined by two divided pieces, the weld is located on the short side of the frame, when the length of the short side of the frame is Y The welding part Y and It is located between Y. It is characterized by the above-mentioned.

Preferably, the divided piece of the frame is characterized in that the '' 'shape.

Hereinafter, with reference to the accompanying drawings, the present invention to achieve the above object will be described in detail.

3 is a structure of the frame 7 according to the present invention, which is made of a frame material having a constant thickness T, the length of the long side portion 10 of the frame is X, the length of the short side portion 11 is Y It forms a frame, and a pair of 'c' shaped split pieces are welded to each other.

In the present invention, the manufacturing process of the frame 7 in the color cathode ray tube is as follows.

First, the divided piece 14 having a 'c' shape is blanked from a frame material having a thickness T as shown in FIG. 4, and a pair of divided pieces are formed in the expanded size of the frame formed in FIG. 2 as shown in FIG. 5. A blank for forming is formed by welding by a welding method, a low frequency welding method, or a flash bart welding method, and then forming a frame having a long side portion 10 having a length X and a short side portion 11 having a length Y as shown in FIG. You are done.

The divided piece 14 is made of a divided piece of the 'c' shape in order to reduce the scrap as much as possible.

In addition, in order to maximize the strength of the frame, it is advantageous to perform welding by tilting the welded part slightly in the vertical direction as shown in FIG. That is, the angle of the cross section of the welded portion inclined at a constant angle with the vertical In consideration of strength and workability, Is -30 ° < It is preferred to be in the interval of <30 °.

7 is a graph showing the length, that is, the strength that can be welded along the long side portion 10. As shown in the graph, when the position of the welding portion 13 is W, the portion having the strongest strength is the long side. Part 10 Since it is the point of phosphorus, it is necessary to determine the position of the welded portion at the strength part, so that the long side portion 10 And long side The weld 13 must be determined between.

In addition, FIG. 8 illustrates the amount of miss-landing change, ie, the sensitivity of the geomagnetic field, caused by the geomagnetic field during rotation of the color cathode ray tube along the long side 10 of the frame 7. -Landing is relatively small changes to the long side portion 10 of the By selecting the frame 7 welded portion 13 near this portion, it is possible to minimize the effects of the geomagnetic field due to the welding of the frame 7.

In the welding of the divided pieces, the welds 13 should be welded so as not to overlap each other, as shown in FIG. 9, and the thickness of the welded portion is different from the thickness of the frame material T. As shown in FIG. 9, the thickness of the welded portion is called t. T / T has a thickness such as 0.8 <t / T <1.2 so that the final finished product of the frame (7) can be combined with the shadow mask (3) to improve the bonding strength and increase the processing capacity. do.

And the positioning of the welding portion as described above is similarly applied to the short side portion 11 of the frame, it can have the same effect as welding on the long side of the frame.

In the present invention, blanking the divided pieces of the 'c' shape in the frame material, and welded a pair of divided pieces to the developed size of the molded frame to form a blank for forming, and then to complete the frame by molding do.

Therefore, by increasing the utilization rate of the material by minimizing the blanking scrap (Blanking Scrap) it can contribute to the reduction of raw material costs and productivity.

In addition, unlike the multi-fms split frame, it is possible to have a very strong advantage in rigidity by making the length of the weld as long as possible.

Claims (7)

A panel provided with a fluorescent surface on an inner side thereof, a funnel fused using frit glass on the rear side of the panel, a shadow mask in which electron beam through holes are innumerably perforated so as to perform color discrimination of the electron beam, and a frame supporting the shadow mask. In the color cathode ray tube to say, The frame is welded and joined by two split pieces, The weld is located at the long side of the frame, and when the length of the long side of the frame is X, the weld is X and A color cathode ray tube, which is located between X. A panel provided with a fluorescent surface on an inner side thereof, a funnel fused using frit glass on the rear side of the panel, a shadow mask in which electron beam through holes are innumerably perforated so as to perform color discrimination of the electron beam, and a frame supporting the shadow mask. In the color cathode ray tube to say, The frame is welded and joined by two split pieces, The weld is located at the short side of the frame, and when the length of the short side of the frame is Y, the weld is Y and A color cathode ray tube, which is located between Y. The method according to claim 1 or 2, A color cathode ray tube, characterized in that the divided piece of the frame is' ''. The method according to claim 1 or 2, The welded section of the divided piece is inclined at an inclination of the vertical portion and a constant angle color cathode ray tube. The method of claim 4, wherein Theta is a color cathode ray tube satisfying the following equation when theta is a constant angle of the weld section of the split piece. -30 ° < <30 ° The method according to claim 1 or 2, When the thickness of the frame material is T, and the thickness of the welded portion is t, the color cathode ray tube, characterized in that the ratio value of t / T is greater than 0.8 and less than 1.2. The method according to claim 1 or 2, The color cathode ray tube, characterized in that the welding portion is located at the point where the height of the long side or short side of the frame is maximum.