KR20020096622A - A Color Cathode-ray Tube Having The Several-layer Corner Spring - Google Patents

Abstract

PURPOSE: A color cathode ray tube having a multi-layered corner spring is provided to prevent the degradation of quality due to the impact of a large-scaled cathode ray tube by increasing the elasticity of a corner spring that connects a funnel to a frame. CONSTITUTION: A panel has a fluorescent screen. A funnel is connected to the panel. An electron beam gun is mounted on a neck unit of the funnel and emits electron beam toward the fluorescent screen. A shadow mask selects colors. A frame fixes and supports the shadow mask. A corner spring connects the frame to the panel to support them. A stud pin supports the corner spring. The corner spring is divided by a frame fixing unit(8-1) fixed to the frame and a panel fixing unit(8-2) connected to the panel through the stud pin. The frame fixing unit(8-1) and the panel fixing unit(8-2) are partially coupled to each other. At least one reinforcement member(8-3) is adhered between the frame fixing unit(8-1) and the panel fixing unit(8-2).

Description

Color Cathode-ray Tube Having The Several-layer Corner Spring}

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 the electron gun (10) inserted into the neck portion of the funnel and radiating the electron beam (6), and mounted at regular intervals inside the panel to allow the electron beam (6) to pass through A shadowed mask (3) having a pit formed therein, a frame (7) fixedly supporting the shadow mask so that the shadow mask is kept at a constant distance from the inner surface of the panel, a corner spring (8) supporting the frame and the panel in a row, and the Stud pins 12 for supporting corner springs, inner shields 9 for shielding the cathode ray tube from the influence of external geomagnetism, and reinforcing bands 11 installed around the side surfaces of the panel to prevent external impacts. It is composed.

Reference numeral 5 is a deflection yoke.

Figure 2 shows the structure of a conventional corner spring. The corner springs are divided into a frame fixing part 8-1 fixed to the frame and a panel fixing part 8-2 connected to the panel through stud pins as shown in FIG. The plates are joined to each other in part. In addition, the height after being fastened as shown in Figure 2c is reduced than the initial height. The corner spring is welded to the metal frame as shown in FIG. 3 and fastened to the metal stud pin 12 attached to the panel 1 of the glass to couple the frame 7 to the panel 1. In order to satisfy the conditions of the manufacturing process, the corner spring should be free and easy to detach and maintain its shape even after frequent detachment.

The corner spring not only combines the frame and the panel but also compensates for the dominant phenomenon. The domming phenomenon will be described with reference to FIG. 4 as follows. First, the beam 6 from the electron gun passes through the mask 3, in which heat is generated inside the cathode ray tube, causing the mask 3 to swell, and the heat is secondarily transferred to the frame 7 to the frame 7. This expansion causes the height of the mask to be lower than the initial height due to the expansion of the frame. 4A shows an initial state, that is, a power off state. When the power is turned on in this state, the beam from the electron gun hits the mask to generate heat, and the mask 3 made of metal expands to the position of (3-1) as shown in FIG. 4B, and thus the panel 1 and the mask ( 3) The distance between them becomes narrower. In addition, as time passes, heat is transferred to the frame 7, and the metal frame 7 undergoes thermal expansion, so that the height of the mask 3 welded to the frame 7 is initially set as shown in (3-2) of FIG. 4C. Will be lower. This phenomenon is called a dominant phenomenon. To compensate for this, a corner spring is designed. The corner spring finds the position of the initial mask by lifting the frame in the y-axis direction when the frame expands and presses the spring as shown in FIG. 4D.

On the other hand, as the CRT becomes larger, the size of the frame increases and the weight also increases. In particular, with the expansion of digital broadcasting, wide (16: 9) models are on the rise. However, since the elastic force of the corner spring with respect to the increase in the weight of the frame is limited, the frame is biased to one side due to the impact, in particular, the side impact, and as a result, the beam passing through the slot of the mask does not reach its position, resulting in a tar color. The quality will be reduced. In addition, the reliability of the quality of the shock that may occur during the transport process is not secured, and the height of the spring does not maintain the initial value as the panel and the frame are detached several times during the process.

Conventional corner springs mainly use stainless SUS-based materials to meet the conditions of mass production, such as non-magnetic corrosion resistance, which does not increase elasticity in proportion to increasing the thickness of the spring but also recovers to its original state. On the contrary, due to the frequent desorption of the process, the distance between the stud pin and the frame cannot be secured, and thus the frame cannot be combined with the panel.

Accordingly, an object of the present invention is to increase the elasticity of the corner spring connecting the funnel and the frame to support the frame in the CRT, thereby compensating for the quality deterioration caused by the impact of the large cathode ray tube, thereby securing the stability of the quality.

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

2 a to c are views showing the structure and operation principle of the corner spring;

3 is a view showing a panel mask coupling structure;

4 a to d are diagrams showing the ming phenomenon;

Figure 5a to b is a view comparing the structure of the conventional corner spring and the multilayer corner spring of the present invention

Figure 5a is a view showing a conventional corner spring,

Figure 5b is a view showing a multi-layered corner spring of the present invention,

6 is a side view of a corner spring;

7 is a diagram showing a relationship between a reconstruction height of a mask and a compression required load;

8 is a scatter diagram of the mask restoration height;

9 and 10 show a multilayer corner spring of the present invention.

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

DESCRIPTION OF SYMBOLS 1: Panel 2: Funnel 3: Mask 4: Fluorescent surface

7 Frame 8 Spring 8-1 Frame Fixing

8-2: Panel fixing 8-3: Reinforcing member 12: Stud pin

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 regular intervals with respect to the inner phosphor screen to serve as color screening, a frame for fixing and supporting the shadow mask, a corner spring for connecting and supporting the frame and the panel, and a stud for supporting the corner spring. In the color cathode ray tube including a pin, the corner spring is divided into a frame fixing fixed to the frame and a panel fixing connected to the panel through the stud pins, the frame fixing and the panel fixing each part is coupled to each other One or more reinforcing members are provided between the frame fixing part and the panel fixing part. It is characterized by being attached.

The length of the reinforcing member attached between the frame fixing and the panel fixing is less than or equal to three quarters of the unfolded length of the frame fixing or panel fixing, and the length of the reinforcing member attached between the frame fixing and the panel fixing. The width is less than the width of the frame fixing or panel fixing, the material of the reinforcing member attached between the frame fixing and the panel fixing is less than 150kg / ㎜ tensile strength, in accordance with the test method of metal material tensile test piece No. 13, Elongation is 15% or less, characterized by no magnetic and corrosion resistance.

Figure 5 is a comparison of the structure of the conventional corner spring and the multilayer corner spring of the present invention, Figure 5a shows a conventional corner spring, Figure 5b shows a multilayer corner spring of the present invention. As shown, the elastic force can be increased by attaching at least one reinforcing member 8-3 between the frame fixing portion 8-1 and the panel fixing portion 8-2 of the corner spring.

As an example of the present invention, the existing spring of the 32-inch wide model and the multilayer corner spring of the present invention were actually manufactured to examine the effects of the present invention.

Figure 6 shows the experiment to measure the recovery rate by measuring the initial height of the conventional spring and then forcibly yielding the frame fixing portion (8-1) to the floor for 10 seconds and then again measuring the height of the spring. The recovery rate is calculated by the following equation.

Recovery Rate = Height after Surrender / Initial Height × 100

As a result of measuring the recovery rate of the conventional stainless-based SUS631, SUS3041H, SUS3043 / 4H by the above test method is shown in Table 1.

Table 1

spar SUS631 SUS3041H SUS3043 / 4H End point height (mm) Initial height 17.14 17.05 17.05 Height after surrender 15.19 15.18 11.71 % Recovery 89 89 69 Sample count 10 95 10

In the same material, the recovery rate varies depending on the difference in tensile strength. In other words, the greater the tensile strength, the higher the recovery rate. Table 2 below is a result of measuring the recovery rate while changing the tensile strength of the SUS3041H material.

[Table 2]

Tensile Strength (㎏ / ㎠) 129.1 135.1 140.1 End point height (mm) Initial height 17.34 17.25 17.05 Height after surrender 14.65 14.69 15.18 % Recovery 84 85 89 Number of samples 10 75 10

7 is a result of experimenting the correlation between the restoring height and the compression required load (force required to maintain a constant height) with a spring of stainless steel SUS304 material having a top plate thickness of 0.6t, a bottom plate thickness of 1.0t. As shown in the graph, the restoration height and the compressive demand load show a proportional relationship. That is, the higher the restoring height, the higher the compressive demand load, and the higher the restoring height, the larger the tightening force and the smaller the amount of change due to impact.

FIG. 8 shows a scatter diagram of the restoration height of 75 conventional corner springs with the same lot of raw materials (materials having physical properties of 140.1㎏ / ㎠ tensile strength, elongation less than 2% and hardness of 400 ° or more in SUS3041H) will be. As shown, the same material and the same physical properties have a dispersion, and in particular, the lower limit of the center value of the dispersion has a similar recovery rate to a material having a low physical property value. In other words, about 20% of the samples of material having tensile strength of 140.1㎏ / ㎠, elongation less than 2% and hardness of 400 ° or more in SUS3041H material have tensile properties of 135.1㎏ / ㎠, elongation less than 2% and hardness of more than 390 °. The recovery rate is similar to that of the center of the sample made of the material. Therefore, the improvement of the restoring height or the restoring force by adjusting the properties of the stainless material has limitations in terms of the physical property limit of the raw material itself (it is difficult to manufacture the raw material with tensile strength over 150㎏ / ㎠) and the distribution control. That is, simply increasing the material and thickness does not completely solve the problem of increasing the resilience.

Table 3 below compares the recovery rate of the CRT and the axial change according to the side drop of the conventional technology. The axial change amount refers to a deviation from the initial deviation due to the movement of the mask slot due to the side impact, which is caused by the frame not finding its position after the impact due to the spring elasticity or the restoring force limit. .

Table 3

Frame weight 1.62 kg 1.02 kg spar Tensile Strength (㎏ / ㎠) % Recovery Axis change amount (㎛) Quality level % Recovery Axis change amount (㎛) Quality level SUS 631 140 89 30 Shine 89 20 Good SUS 304 1H 129.1 84 70 Color 84 30 Shine 135.1 85 60 Color 85 30 Shine 140.1 89 30 Shine 89 20 Good 135.1 Multilayer 99 15 Good 99 10 Good SUS 304 3 / 4H 126 69 90 Color 69 40 Color

As can be seen from Table 3, the recovery rate of SUS3041H is about 85% in the case of the conventional corner spring, whereas the recovery rate is increased by 99% in the case of multi-layered corner springs of the same material, and the amount of axial change is reduced by 25-30%. The level has also improved. In addition, since the force of the frame detacher is about 15 times the compressive load load of the multi-layer corner spring, there is no problem in the detachable error in the process.

The length of the reinforcing member inserted in the present invention is preferably not more than three quarters of the unfolded length of the frame fixing or panel fixing. That is, the following formula must be satisfied.

0 <c < Or 0 <c <

In the above formula, c is the length of the reinforcing member to be inserted, a is the length of the unfolded frame fixing and b is the length of the unfolding panel fixing (Fig. 9).

In addition, the width of the reinforcing member to be inserted in the present invention is preferably not exceeding the width of the panel fixing. That is, the following formula must be satisfied.

0 <E <f

E is the width of the reinforcing member to be inserted and f is the width of the panel fixing (Fig. 10).

When the width of the reinforcing member is greater than the width f of the panel fixing portion, the deformation of the reinforcing member is expected due to frequent contact during the process, and the reinforcing member may not function properly due to the deformation.

The material of the reinforcing member to be inserted into the present invention is, in particular, in accordance with the test method of the tensile test piece No. 13 of the metal material, the tensile strength is 150 kg / mm 2 or less, the elongation is 15% or less, is not magnetic and has corrosion resistance.

As described above, the present invention has a multi-layered corner spring connecting the panel and the frame to support the frame in the CRT, thereby increasing the elasticity of the corner spring, in particular, increasing the resilience due to the impact of the large cathode ray tube and reducing the amount of axial change. It is effective in reducing quality, ensuring quality stability, and realizing high quality.

Claims (4)

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 a color cathode ray tube comprising a shadow mask that serves as a color screening, a frame for holding and supporting the shadow mask, a corner spring for connecting and supporting the frame and the panel, and a stud pin for supporting the corner spring, The corner spring is divided into a panel fixing fixed to the frame and a panel fixing connected to the panel through a stud pin; The frame fixing part and the panel fixing part are combined with each other; Color cathode ray tube having a corner spring, characterized in that at least one reinforcing member is attached between the frame fixing and the panel fixing. The method of claim 1, And a length of the reinforcing member attached between the frame fixing part and the panel fixing part is 3/4 or less of the unfolded length of the frame fixing part or the panel fixing part. The method of claim 1, A color cathode ray tube, characterized in that the width of the reinforcing member attached between the frame fixing and the panel fixing is less than the width of the frame fixing or panel fixing. The method of claim 1, The reinforcing member attached between the frame fixing part and the panel fixing part has a tensile strength of 150 kg / mm2 or less, an elongation of 15% or less, magnetic properties, and corrosion resistance according to the test method of metal material tensile test piece 13. Color cathode ray tube.