KR20020081854A - The Frame for color Cathode-ray Tube - Google Patents

Abstract

PURPOSE: A frame for color cathode ray tube is provided to increase intensity of a sub frame by forming a sub frame with a trapezoidal shape or a curved shape. CONSTITUTION: A fluorescent face is formed on an inner surface of a panel. A tension mask is arrayed in a predetermined interval on the fluorescent face. A main frame(31) is used for fixing and supporting the tension mask. The main frame(31) is combined with both ends of a sub frame(32). The intensity of sub frame(32) per unit areas is increased by forming a sectional face of the sub frame(32) with a trapezoidal shape or a polygonal shape. The main frame(31) is combined with a broad side of the sub frame(32). One side of the sub frame(32) having the trapezoidal shape or the polygonal shape is formed by a curved surface. The main frame(31) is combined with one plane of the sub frame(32).

Description

Frame for color Cathode ray tube {The Frame for color Cathode-ray Tube}

The present invention relates to a color cathode ray tube, and more particularly, to provide a trapezoidal or curved shape of a subframe of a cathode ray tube having an upper and lower tension, thereby providing a rigidity greater than the amount of the same material as compared to the current rectangular cross-sectional shape. It relates to a frame for a color cathode ray tube that can secure the.

1 is a partial cross-sectional view showing a general color cathode ray tube, the color cathode ray tube is a panel (1) having a fluorescent surface (4) coated with a fluorescent material of red, green, blue on the inner wall surface, and the rear of the panel (1) A funnel 2 fused using frit glass, an electron gun encapsulated to emit and accelerate and focus an electron beam 6 of red, green, and blue colors in the neck portion of the funnel 2, and a predetermined phosphor. It consists of a tension mask (3) for sorting colors to emit light and a frame (7) for supporting the tension mask.

There is also a spring 8 which allows the frame assembly to be coupled to the panel and a stud pin which supports the spring. Accordingly, the inner shield 9, which allows the cathode ray tube to be less affected by external geomagnetisms during operation, is coupled to the frame and sealed with high vacuum.

Next, in the electron gun embedded in the neck portion of the funnel 2, the electron beam 6 strikes the fluorescent surface 4 formed on the inner wall surface of the panel 1 by the anode voltage applied to the cathode ray tube. At this time, the electron beam is deflected up, down, left and right by the deflection yoke 5 before reaching the fluorescent surface to form a screen.

Then, there is a magnet 10 of 2, 4, 6 poles that corrects the trajectory of the traveling direction so that the electron beam 6 strikes a predetermined phosphor precisely, thereby preventing poor color purity.

Referring to FIG. 2, the tension mask assembly for the color cathode ray tube having the upper and lower tensions includes an upper and lower main frames welding and supporting the tension mask to the frame, and welding and fixing the main frame to compress the frame to compress the tension mask. It includes a sub-frame that functions as an elastic support member to which an elastic force is applied when welding. Also, by compressing the main frame and welding the tension mask in the same manner as in FIG. 2, the main frame is decompressed to secure the tension by the elastic force of the subframe.

3 is a view showing the compression load on the main frame by position to apply tension to the tension mask to the main frame, and as shown in FIGS. 4A to 4C, the main frame is compressed to weld the tension mask, and then When the compression force is removed, the tension distribution applied to the tension mask is applied with the least tension in the center of the tension mask in the X-axis direction, and the tension increases as it goes to the left and right periphery. Since the compression force applied to the main frame is welded and supported at the end and the elastic force is applied to the subframe when the compression is removed, the tension increases from the center to the periphery.

However, in the conventional color cathode ray tube frame as described above, in the conventional rectangular cross-sectional subframe structure, as shown in Figure 5, when increasing the compressive force of the main frame to apply a high tension to the tension mask, Permanent deformation of the subframe causes a problem that the tension of the periphery is lowered, resulting in a lowering of the natural frequency of the tension mask in the center and the periphery.

In order to solve such a tension drop, in order to apply sufficient tension to the tension mask, the subframe must be structurally designed in a large way in order to increase the rigidity of the subframe. However, the material cost of the subframe increases and the weight of the frame increases.

Accordingly, an object of the present invention is to solve the above problems, by providing a trapezoidal or curved shape of the sub-frame of the cathode ray tube having the upper and lower tension in the same material compared to the current rectangular cross-sectional shape It is to provide a frame for a color cathode ray tube to ensure a rigidity greater than the amount.

1 is a partial cross-sectional view showing a general color cathode ray tube,

2 is a view showing a conventional frame welded by tensioning the tension mask,

3 is a view showing the compression load size and the compression displacement state of the main frame,

4A and 4B are diagrams illustrating changes in the frame compression load and the displacement amount for each position of a conventional frame;

Figure 4c is a diagram showing the natural frequency (tension distribution) of the tension mask for each position in the X-axis direction,

5 is a view showing the tension distribution of the peripheral portion according to the permanent deformation of the conventional sub-frame,

6 is a diagram illustrating a stress mechanism of a subframe with respect to a main frame compression force;

7a shows a first embodiment of a frame assembly according to the invention,

7b is a cross-sectional view of a subframe according to the present invention;

7c shows a second embodiment of a frame assembly according to the invention,

8 shows a third embodiment of a frame assembly according to the invention, and

9 shows a fourth embodiment of a frame assembly according to the invention.

<Description of Symbols for Major Parts of Drawings>

1 panel 2 funnel

3: tension mask 4: fluorescent surface

31: main frame 32: subframe

The first technical solution to achieve the above object is, a panel having a fluorescent surface formed on the inner surface, a tension mask disposed at a predetermined interval on the fluorescent surface, the main frame and the main frame for holding and supporting the tension mask to couple the main frame to both ends In the color cathode ray tube including a frame composed of subframes, the cross-sectional shape of the subframe is trapezoidal to increase the intensity of the subframe per unit area.

The main frame may be coupled to a wide surface of the subframe.

The second technical solution of the present invention is a panel having a fluorescent surface formed on its inner surface, a tension mask disposed at regular intervals on the fluorescent surface, a main frame fixedly supporting the tension mask, and a subframe coupling the main frame to both ends. In the color cathode ray tube including a frame configured, the cross-sectional shape of the sub-frame is formed into a polygon of five or more polygons to increase the strength of the sub-frame per unit area.

The third technical solution of the present invention is a panel having a fluorescent surface formed on its inner surface, a tension mask disposed at regular intervals on the fluorescent surface, a main frame fixedly supporting the tension mask, and a subframe coupling the main frame to both ends. In the color cathode ray tube comprising a frame configured, the cross-sectional shape of the sub-frame is formed of four or more polygons, characterized in that at least one surface is formed into a curved surface, and the main frame is coupled to one plane.

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

Referring to Figure 6, the tension mask assembly for the cathode ray tube having the upper and lower tension, the upper and lower main frame 31 for welding and supporting the tension mask to the frame, and the main frame 31 is welded, fixed and supported It has a sub-frame 32 which functions as an elastic support member to which elastic force is applied when the frame is compressed to weld the tension mask.

As shown in FIGS. 7A and 7B, the first embodiment of the present invention has a trapezoidal cross-sectional shape of a subframe 32 that couples the main frame to both ends thereof, thereby increasing rigidity and applying a desired tension with a small deformation amount. will be.

The relational equation for reducing the stress on the subframe by increasing the cross-sectional moment of inertia of the subframe is as follows.

σ = (Equation 1)

Where M is the moment, I is the moment of inertia, and h is the height of the subframe.

Increasing the moment of inertia of the cross-section in the same material and the same length of the subframe can reduce the stress of the subframe to apply more tension to secure the desired tension.

Referring to FIG. 7B, the moment of inertia of the section in the trapezoidal shape ( ) Is based on the following equation (Equation 2).

= * (Equation 2)

In the conventional rectangular cross-sectional structure, as shown in FIG. ) Is expressed by the following equation (Equation 3).

= (1/12) * b (Equation 3)

The cross-sectional moments of inertia of the two shapes when the cross-sectional area of the quadrangle and the trapezoid shape are the same as the material of the subframe

》

The trapezoidal cross-sectional moment of inertia is large, so that the stress is smaller than that of the conventional quadrangular shape, so that the compressive force can be increased to apply the desired tension to the tension mask.

FIG. 7C illustrates a second embodiment of the present invention in which the cross-sectional shape of the subframe is trapezoidal, and the same effect can be obtained when the main frame 31 is coupled to the wide surface of the subframe.

Therefore, as shown in FIG. 7A, the mating surface of the subframe and the main frame is smaller than the width of the bottom, or the mating surface of the subframe and the main frame is larger than the width of the bottom or the cross-sectional inertia moment is the same. In this case, the trapezoidal section moment of inertia is larger than that of the square.

8 is a hexagonal cross-sectional shape of the sub-frame 32 to couple the main frame 31 to one plane, or at least one surface as a curved surface as shown in Figure 9 and the main frame 31 in one plane ) Also allows the cross section moment of inertia to be larger than the square shape.

As described above, according to the present invention, by increasing the cross-sectional moment of inertia to reduce the stress applied to the subframe, it is possible to secure higher rigidity with the same amount of subframe material as the conventional rectangular subframe.

In addition, since the trapezoidal sub-frame material can be used in order to secure a conventional tension level in the rectangular shape, the material cost can be reduced.

Claims (4)

A color cathode ray tube comprising a panel having a fluorescent surface formed on an inner surface thereof, a tension mask disposed at a predetermined interval on the fluorescent surface, a main frame fixedly supporting the tension mask, and a frame composed of subframes coupling the main frame to both ends thereof. In The cross-sectional shape of the sub-frame to form a trapezoidal frame for the color cathode ray tube, characterized in that to increase the intensity of the sub-frame per unit area. The method of claim 1, Color cathode ray tube frame, characterized in that for coupling the main frame to a wide surface of the sub-frame. A color cathode ray tube comprising a panel having a fluorescent surface formed on an inner surface thereof, a tension mask disposed at a predetermined interval on the fluorescent surface, a main frame fixedly supporting the tension mask, and a frame composed of subframes coupling the main frame to both ends thereof. In The cross-sectional shape of the sub-frame is formed by a polygon of five squares or more to increase the intensity of the sub-frame per unit area, characterized in that the frame for color cathode ray tube. A color cathode ray tube comprising a panel having a fluorescent surface formed on an inner surface thereof, a tension mask disposed at a predetermined interval on the fluorescent surface, a main frame fixedly supporting the tension mask, and a frame composed of subframes coupling the main frame to both ends thereof. In The cross-sectional shape of the sub-frame is formed of four or more polygons, at least one surface formed of a curved surface, characterized in that the frame for the color cathode ray tube, the main frame is coupled to one plane.