KR20020081853A - The Frame Assembly Structure for Color Cathode-ray Tube - Google Patents

Abstract

PURPOSE: A frame assembly structure for a color cathode ray tube is provided to separate easily a spring from a frame by improving a combination structure of the spring and the frame. CONSTITUTION: A plurality of brackets is adhered to each side of a long side and a short side of a frame. The bracket has a thin plate shape. A spring is combined with the bracket by using a welding method. The spring is welded with the panel in order to supplement a height difference between a main frame(7a) and a sub frame(7b). A center of gravity of the frame structure is maintained by using three brackets. The rotation and the twist of the frame assembly structure are prevented by adhering the spring to the fourth bracket. A color distortion phenomenon is removed by preventing the rotation and the twist of the frame assembly structure.

Description

The Frame Assembly Structure for Color Cathode-ray Tube

The present invention relates to a color cathode ray tube, and more particularly, to a spring attachment structure for easier attachment and detachment of the spring (10) by setting the position at which the spring is attached to the frame in the same rotational direction at the top, bottom, left and right center lines of the frame. It is about.

Referring to the operation principle of a general color cathode ray tube, a fluorescent glass 4 having a front glass called a panel 1 and a rear glass called a funnel 2 is combined in a cathode ray tube as shown in FIG. And a shadow mask 3 for sorting colors to emit light of a predetermined phosphor, and a frame 7 for supporting the electron gun, which is the source of the electron beam 6 for emitting the fluorescent surface.

In addition, a spring 11 for allowing the frame assembly to be coupled to the panel and an inner shield 12 that serves as a shield so that the cathode ray tube is less affected by external geomagnetism during operation are fixed to the frame.

Referring to the operation principle of the cathode ray tube, the fluorescent surface 4 in which the electron beam 6 is formed on the inner surface of the panel 1 by the anode voltage applied to the cathode ray tube in the electron gun embedded in the neck of the funnel 2. In this case, the electron beam is deflected up and down and left and right by the yoke 5 before reaching the fluorescent surface to form a screen.

In addition, there are 2, 4, and 6 pole magnets (13) that correct the traveling trajectory so that the electron beam 6 strikes a predetermined phosphor, thereby preventing poor color purity.

In addition, since the cathode ray tube is sealed in a high vacuum, firecrackers can easily occur due to external impact, and the panel 1 is designed to have a structural strength capable of withstanding atmospheric pressure in order to prevent this.

Moreover, by attaching the reinforcing band 14 to the skirt of the panel 1, the stress which a cathode ray tube of a high vacuum state receives is disperse | distributed and the impact resistance is ensured.

FIG. 2 shows a frame structure for fixing the tension type shadow mask 4, and two sheets forming the same curvature as the inner curvature of the panel 1 when the shadow mask 4 is welded to the frame 7. The main frame 7a of the side and the subframe 7b positioned at two short sides providing elastic force when compressing the main frame while being perpendicular to the main frame are welded to the main frame. In this way, the tension-type shadow mask is tensioned and welded in such a manner that two long sides of the main frame 7a of the frame structure are compressed as a plurality of compression pins on the outer wall of the main frame from the outside toward the major axis of the frame and a certain amount of displacement. When the pressure is compressed, the shadow mask is welded and attached to the main frame, and when the pressure applied to the main frame is gradually released, the shadow mask begins to be tensioned, and the force that the frame returns to its original position and the force that the shadow mask pulls are balanced. The positional displacement of the frame at the point stops, ultimately tensioning the shadowmask, resulting in a frame assembly structure as shown in FIG.

In order to couple the frame assembly structure thus made with the panel 1, a plurality of springs are attached to the long and short sides of the frame. At this time, one end of the spring is welded to the frame and a hole of a predetermined size is formed at the other end and the frame assembly structure is fixed to the panel by coupling the hole to the stud pin located on the inner wall of the skirt part of the panel 1.

The subframe structure of the conventional frame assembly structure has a solid bar or hollow pipe shape as a single body, and has a curved shape to increase the repulsion force against compression. As a separate manufacturing process is required, and the time and money required for manufacturing are increased, it is not only an absolute factor that does not lower the manufacturing cost of the frame assembly structure but also has a limit in increasing the repulsion force against the mainframe compression. The tension shadowmask tension in the center of the frame is much lower than the periphery, which ultimately degrades the howling characteristics because the frequency drops off and invades the region where it can resonate with the natural frequencies of the frame assembly structure.

In order to overcome this problem, when the compression amount of the mainframe is increased to increase the tension in the center part, the supporting force of the subframe must be increased, so that in the conventional monolithic subframe structure, the size of the subframe may be increased or withstand the increased compression force. It is necessary to use a material capable of increasing the weight of the frame structure, and if the weight and size of the frame assembly structure are increased as illustrated in FIGS. 3 and 4, it is necessary to prevent the color twisting. It is difficult to maintain the center of gravity stably with two brackets, and one bracket must be added to make the structure with four brackets.

In a frame assembly structure where four brackets are required, if the position where the bracket is attached is not sufficiently taken into account, there is a concern that the length of the spring that eventually engages the bracket and the other end to the stud pin of the panel may be excessively long. In addition, there is a problem that the frame assembly structure to be combined with the panel may be incorrectly combined.

Accordingly, an object of the present invention is to solve the above-described problem, and the spring is attached to make the spring 10 more easily detachable by setting the position of the spring to the frame in the same rotational direction at the top, bottom, left and right center lines of the frame. To provide a structure.

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

Figure 2 is a view showing the mounting state of the frame assembly for a common color cathode ray tube,

3 is a view showing a conventional spring attachment state,

4 is a view showing another conventional spring attachment state,

5 is a view showing the state of attachment of the spring according to an embodiment of the present invention,

6 is a view showing the attachment state of the spring according to another embodiment of the present invention,

7 is a perspective view of a frame assembly with a spring according to the present invention,

<Description of Symbols for Major Parts of Drawings>

1 panel 2 funnel

3: electron gun 4: shadow mask

5: deflection yoke 6: electron beam

7: frame 7a: mainframe

7b: subframe 9: bracket

10: spring 11: inner shield

12: magnet 13: reinforcement band

Technical solution of the present invention for achieving the above object is a panel having a fluorescent surface formed on the inner surface, a shadow mask disposed at a predetermined interval on the fluorescent surface of the inner surface of the panel, a rectangular frame fixed to the shadow mask, and one end of the rectangular A color cathode ray tube comprising a spring welded to a long side of a frame and a second end coupled to a stud pin on an inner wall of a panel skirt to hang the frame on an inner surface of the frame, wherein the spring is formed on the opposite long side of the frame, or The line connecting the welding position of each spring welded to the short side is characterized by having a certain angle with respect to the long or short axis of the frame.

In addition, the shadow mask is a tension type, the frame is composed of two main frames for fixing both ends of the main frame by applying a tensile force to the shadow mask, the spring and the main frame facing Preferably welded to the subframe

Preferably, at least one of a straight line connecting the welding position of the spring on the opposite side of the frame and a straight line connecting the welding position of the spring on the short side of the frame passes within 10mm of the center radius of the frame.

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

The structure and function of the frame, shadow mask, and spring to which the present invention is applied are the same as the general structures and functions described with reference to FIGS. 1 and 2, and thus will be omitted.

Figure 5 shows a frame assembly with a spring according to the present invention, after attaching a thin plate-like brackets on the sides on each side of the long and short sides of the frame, the spring is welded to the bracket. At this time, the bracket is to ensure that the fixing point in the vertical direction to the tube axis when fixing the spring to the panel. That is, to compensate for the height difference between the main frame 7a and the subframe 7b. Hereinafter, the expression of attaching the spring to the frame includes not only welding directly to the frame but also welding to the bracket.

As shown in FIG. 5, the present invention attaches a spring to bracket 4 while maintaining the center of gravity of the frame structure with three brackets before attaching bracket 4, thereby ultimately preventing rotation and twisting of the frame assembly structure. It is possible to prevent the color distortion, and the moment of inertia (1 ≒ 1382) of the spring is fixed to the three frames attached to and fixed to the center of gravity, and the weight of the frame structure is determined (about 6.3Kg) The deflection equation of the beam to ensure that the color distortion of bracket 4 falls within the maximum allowable range (0.15mm) when supporting the center of gravity of the frame structure with a spring. The distance L1 obtained from is about 63.76mm.

Therefore, when the position where the bracket is attached to the frame structure is attached to the center of the bracket from the center of each frame end constituting the frame structure within 65mm away from the frame structure that can prevent color distortion due to sag I can make it.

In addition, connect the center of the 2 brackets to be attached to the short side of the frame, that is, the straight line connecting the attachment positions (a1 and b1) of the spring, and the center of the 2 brackets to be attached to the long side of the frame, namely the attachment positions of the springs (c1 and d1). It is possible to maintain a stable center of gravity of the frame structure by setting the attachment position of the bracket such that a straight line passes through at least one center of the frame structure (0).

Then, in order to determine the joining direction in the joining of the finished frame structure and the panel, and to minimize the joining error caused by the twisting of the panel and the frame structure after joining, the distance from the center of the electrical frame structure (0) It is preferable to allow d2) to pass within 10 mm.

As described above, according to the present invention, as shown in Figure 6 by making the bracket attached position in the same rotation direction in each of the center line (A and B, C and D) of the upper and lower sides, regardless of the size of the frame structure There is an important advantage that the attachment and degassing equipment for the detachment of the panel and the frame structure occurring during the manufacturing process and make the attachment and detachment of the spring 10 more easily can be shared.

Claims (3)

A panel having a fluorescent surface formed on its inner surface, a shadow mask disposed at regular intervals on the fluorescent surface of the inner surface of the panel, a rectangular frame fixed to the shadow mask, and one end welded to each of the long and short sides of the rectangular frame, and the other end is in the panel skirt portion. In the color cathode ray tube comprising a spring coupled to the stud pins on the side wall for hanging the frame on the inner surface of the panel, The spring is a color cathode ray tube, characterized in that the line interconnecting the welding position of each spring welded to the opposite long side or short side of the frame has an angle with respect to the long axis or short axis of the frame. The method of claim 1, The shadow mask is of a tension type, and the frame is composed of two main frames fixed by applying tension to the shadow mask and two subframes fixing both ends of the main frame, and the springs face the main frame and the subframe. Color cathode ray tube, characterized in that welded to. The method of claim 1, Color cathode ray tube, characterized in that at least one of the straight line connecting the welding position of the spring located on the opposite long side of the frame and the straight line connecting the welding position of the spring located on the short side passes within 10mm of the center radius of the frame.