KR20020066613A - A Color Cathode-ray Cube Containing The Improved Damper Spring - Google Patents

Abstract

PURPOSE: A color CRT with improved damper spring is provided to prevent screen flicker of shadow mask cause due to an external vibration, while stabilizing the process of attaching damper assembly to the shadow mask. CONSTITUTION: A color CRT comprises a panel having a phosphor screen; a funnel connected to the panel; an electron gun mounted in the neck part of the funnel, and which emits electron beam toward the phosphor screen of the panel; a shadow mask(3) spaced apart from the phosphor screen; a frame for supporting the shadow mask; a damper line for preventing vibration of the shadow mask; and a damper spring(12) for supporting the damper line. The damper spring includes a bent portion formed adjacent to the shadow mask; a frame welding portion positioned at the side opposite from the bending portion and welded to the frame; a resilience applying portion connected to an end of the bending portion, and which applies resilience to the damper line; and a connection portion for interconnecting the resilience applying portion and the frame welding portion. The resilience applying portion has a length(l3) and the connection portion has a length(l2), wherein the ratio between two lengths(l3/l2) is 2.3 or higher.

Description

Color Cathode-ray Cube Containing The Improved Damper Spring

The present invention relates to a color cathode ray tube, and more particularly, to a color cathode ray tube having a damper assembly (damper spring and damper wire) for preventing the screen from shaking due to external vibration.

In the conventional color cathode ray tube, as shown in FIG. 1, the fluorescent surfaces 4 of R, G, and B are coated on the inner surface, and the panel 1 having the explosion-proof means is fixed on the front thereof, and the rear end of the panel. A funnel (2) fused to it, an electron gun (14) inserted into the neck portion of the funnel to emit an electron beam (6), and mounted at regular intervals inside the panel to form a plurality of holes for the electron beam to pass through Inner shield (3), the inner shield (7) and the spring (8) for holding the shadow mask fixedly so that the shadow mask is kept at a constant distance from the inner surface of the panel and shielding the cathode ray tube to be less affected by external geomagnetic ( 9), a reinforcing band 11 installed around the side of the panel to prevent external impact, a damper wire 14 for preventing the screen from being shaken due to external vibration, and a damper spring for fixing and supporting the damper wire ( Consisting of .

Reference numeral 5 is a deflection yoke and 10 is a magnet.

In the shadow mask 3 of the conventional color cathode ray tube, as shown in FIGS. 2 and 3, a plurality of slots 17 have a predetermined pitch or a bridge is formed between the slots 17, and a large gap thereof is formed. do. The cathode ray tube has a metal frame composed of an opposing main frame 16 and a subframe 15 welded and supported at both ends of the main frame, and a shadow mask in a state in which tension is applied between the main frames 16. 3) is welded. However, since the shadow mask 3 has no bridge or a large gap, the shadow mask 3 is likely to be vibrated by external vibrations such as a speaker, and the color error is generated when the screen is formed by the electron beam. Occurs and image quality is aged.

In order to solve this phenomenon, about 3 damping damper wires 13 are installed in the shadow mask 3, and in order to install the damper wires 13 in the shadow mask 3, an elastic called damping spring 12 is provided. A support piece is needed. When the damper wire 13 is applied to the damper wire 13 using the damper spring 12, the damper wire 13 is compressed to the shadow mask 3 to prevent the shadow mask 3 from shaking.

4 is a view of the damper assembly (damper wire and damper spring) installed in the shadow mask in the direction of the arrow of Figure 2, as shown, the end D of the damper spring 12 is from the end C of the shadow mask (3) It is installed to be separated by a certain distance, for this purpose is formed by forming one or more bent portions in the damping spring 12 as shown in FIG.

As shown in FIG. 5, the shape of the conventional damp-per spring is the distance between the three bent portions a, b, c and the bent portion A (1 ₂ : distance between a to b), and B (1 ₃ : between b to c). Distance) and is divided into bending part, elastic applying part, connecting part, and subframe welding part. It also constitutes the shape of the damping spring at any length ratio and bending angle without defining the distance between the bending portions and the bending angle. According to the conventional case, the length ratio 1 ₂ : 1 ₃ between the bent portions is about 1: 1.8 or 1: 2..2 depending on the size of the color CRT, and the length of 1 ₃ is about 1.8 to 2.2 times the length of 1 ₂ . . However, when the damper assembly is manufactured using the damper spring formed at such a ratio, the damper spring cannot endure the applied tension when the damper wire is applied a lot of tension to effectively reduce the vibration of the shadow mask. As shown in FIG. 6, the distance between the damping spring and the end of the shadow mask is so close that the vibration attenuation time of the shadow mask is delayed, thereby preventing the shadow mask from being effectively removed. In addition, in the process of attaching the damper assembly to the shadow mask, welding should be maintained at a certain distance so as not to damage the shadow mask, but the damper spring cannot endure the tension, so that the distance of the shadow mask cannot be maintained and the end of the shadow mask is damped. The problem of bending due to contact with the spring occurs.

Therefore, in the present invention, by constructing a damping spring in which the length ratio of the connecting portion and the elastic applying portion of the damping spring is adjusted to increase the rigidity of the damping spring, even when a large tension is applied to the damper wire, the damping spring is fixed to the end of the shadow mask. The purpose of the present invention is to increase the vibration control capability of the shadow mask.

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

2 is a diagram illustrating a shadow mask assembly;

3 is a detailed view of the shadow mask assembly;

4 is a view showing a conventional damper spring attachment form,

5 is a view showing a conventional damper spring shape;

6 is a view showing a problem of conventional damping spring attachment;

7 is a view showing a configuration principle of the damper spring of the present invention;

8 is a view showing a configuration principle of the damper spring of the present invention;

9 is a view showing the spring stiffness according to the length ratio of the damper spring bending portion and

10 is a diagram showing a measured value of the spring stiffness according to the length ratio of the damper spring bent portion.

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

1 panel 2 funnel 3 shadow mask 4 fluorescent surface

12 damper spring 13 damper wire 15 subframe 16 main frame

The technical means of the present invention for achieving this object is a panel having a phosphor screen on the inner surface, a funnel connected to the panel, an electron gun mounted to the neck portion of the funnel and emitting an electron beam toward the phosphor screen, the panel A shadow mask arranged at a predetermined interval with respect to an inner phosphor screen and serving as color screening, a frame for fixing and supporting the shadow mask, a damper wire for preventing vibration of the shadow mask, and a damper for fixing and supporting the damper wire A color cathode ray tube comprising a spring, wherein the damper spring is bent at an angle to a bent portion adjacent to the shadow mask, and a frame welded portion which is located opposite to the bent portion to weld the damper spring to the frame, and at one end of the bent portion. An elastic applying portion connected to apply elasticity to a damper wire, and the elastic applying portion And a frame welded part is composed of connection for connecting, characterized in that it satisfies the ratio _(13/12), the range of more than 2.3 the length (1 ₂₎ of the elastic parts it is a length ₍₁₃₎ and the coupling part.

The configuration of the present invention will be described in detail with reference to FIGS. 7 and 8 as follows.

7 and 8 illustrate the shadow mask 3, the subframe 15, the damping spring 12, and the damper wire 13 in the direction of the arrow in FIG. 2. As shown, the damping spring 12 has a frame welding portion attached to the subframe 15 and the remaining portion is coupled to the damper wire 13 so that the end of the bent portion is separated from the end of the shadow mask 3 by a predetermined distance. It rotates until the tension is applied to the damper wire 13 by the rigidity of the damper spring 12.

As shown in ① of FIG. 7, the damper spring has only the bent portion of the welded portion and the bent portion, the bend angle of the welded portion is θ ₁ , and the length is 1 ₁ (distance between a to c) without distinguishing the connecting portion and the elastic applying portion. In this case, the moment M ₁ applied to the damping spring when the force F is applied in the vertical direction to the bending position c of the bent portion is as follows.

M ₁ = 1 ₁ F = k ₁ θ ₁

Where k ₁ is the stiffness of damping spring ① and θ ₁ is the angle rotated to point e.

In addition, when the shape of the damping spring is bent at an angle of θ _{2 at} the point a and at an angle of θ _{3 at} the point b as shown in ② of FIG. 7, the damping spring is applied when the force F is applied to the bending position c perpendicular to the bending position c. The moment M ₂ applied to is the following formula.

Where k ₂ is the stiffness of the damping spring ② and θ ₂ is the angle at which the damping spring is rotated to point e.

When the magnitudes of the forces applied in the above two equations are the same, the magnitude of the moment is proportional to the distance to which the force is applied. Therefore, since the distance of the shape ② is smaller than the shape ①, the magnitude of the moment is also small. This is represented by the following formula.

M ₂ 〈M ₁

The above formula is replaced with a formula for comparing the stiffness of the damping spring.

Since the angle θ ₁ is larger than the angle θ ₂ , the stiffness of the damping spring ② becomes larger than that of the damping spring ①.

Therefore, to increase the stiffness by further forming one portion bent to any angle θ ₃ at any point between any of the welded part and the bending in the bent damper spring in each θ ₂ parts it is possible to increase the tension that can be applied to the damper wire.

8 compares the formation positions of the additional bent portions. As shown, damping spring ③ is divided into length 1 ₁ (distance between a to c) to form an additional bent part near the bending part, and damping spring ④ is close to the welding part, that is, 1 / of the length of damping spring. An additional bent portion is formed at two or less places. When the two damping springs are bent to point e, the magnitude of the tension applied to the damper wire can be expressed by the following equation.

Where k ₃ and k ₄ are the stiffness of damping springs ③ and ④, and h ₃ and h ₄ are the distances from the point e to the point c of the bend of the damping damping spring.

In the above equation, if the two damping springs ③ and ④ are the same material, and the two angles θ ₁ and θ ₂ are the same, the magnitude of k ₄ and h ₄ is larger than that of k ₃ and h ₃ , so the magnitude of the force can be expressed by the following equation. have.

Therefore, the damper spring, which is positioned near the welded portion, that is, less than half the length of the damper spring, can apply more tension to the damper wire and the size of the rigidity that can be supported increases.

9 is a damping spring made of SUS304 material having a size of 48 mm × 10 mm in order to find out the effect of the damping spring stiffness according to the position of the additional bent portion and the ratio of the length of the elastic applying portion and the connecting portion 1 ₃ : 1 ₂ is a graph showing the results of measuring the magnitude of the rigidity of the damping spring produced by changing ₂ using a push-pull gauge, and FIG. 10 shows a part of the result value of the graph as a table. As shown in the two figures, as the ratio of the length increases, the stiffness increases, but when the length ratio exceeds a certain ratio, the stiffness does not increase any more and converges. Here, when the length ratio is 2.3 or less, the same problem as in FIG. 6 occurs when the tension ratio is 85gf or more applied to the damper wire. However, when the length ratio is 2.3 or more, the damper spring maintains a constant distance from the end of the shadow mask even when a tension of 85gf or more is applied. . Therefore, when a large tension is applied to the damper wire, the connecting portion and the elastic applying portion are formed at the following ratio, so that the damping spring can maintain a constant distance from the end of the shadow mask.

As described above, the present invention forms a damping spring according to the above principle, and thus, even when a large tension is applied to the damper wire, the damping spring is not affected from the end of the shadow mask during the shadow mask vibration, and the damping spring is a constant distance from the end of the shadow mask. It is so far apart that a constant tension can be applied to the damper wire. In addition, in the process of attaching the damper assembly to the shadow mask, the process of welding the conventional damper spring to the subframe or after welding reduces the damage of the tip of the damper spring to the end of the shadow mask to stabilize the process. In addition, by effectively preventing the screen shake of the shadow mask, it is effective to reduce the degree of poor image quality when forming the screen.

Claims (1)

A panel having a phosphor screen on an inner surface, a funnel connected to the panel, an electron gun mounted to a neck portion of the funnel to emit an electron beam toward the phosphor screen, and disposed at a predetermined interval with respect to the phosphor screen on the inner surface of the panel In the color cathode ray tube comprising a shadow mask that serves as a color screening, a frame for holding and supporting the shadow mask, a damper wire for preventing vibration of the shadow mask, and a damper spring for holding and supporting the damper wire, The damping spring is bent at an arbitrary angle to the bent portion adjacent to the shadow mask, the frame welding portion is located on the opposite side of the bent portion welded to the frame, and the elastic applying portion connected to one end of the bent portion to apply elasticity to the damper wires; A connection part connecting the elastic applying part and the frame welding part; The elastic portion is long ₍₁₃₎ and the length (1 ₂₎ the ratio of the connection (1 _{3/1 2) The} color cathode ray tube which is characterized by satisfying the range of more than 2.3.