KR100414497B1 - Crt - Google Patents

Abstract

The present invention relates to a funnel of a cathode ray tube.

The configuration of the present invention, a panel having a fluorescent surface is installed on the inner surface, fused using a frit glass on the rear of the panel and is attached to the inside of the cone portion of the funnel and the funnel consisting of a body portion, a rectangular cone portion, and a neck portion and a cathode ray tube In the cathode ray tube including a getter to improve the degree of vacuum of, wherein at least one portion having a thickness smaller than the thickness of the cone portion on the reference line between 30mm ~ 50mm toward the screen from the reference line of the funnel cone portion.

Therefore, according to the present invention, the effect of improving the SMC characteristic, which is a distortion of an image occurring at the lower end of the screen, and improving the life of the cathode ray tube can be obtained.

Description

Cathode Ray Tube {CRT}

The present invention relates to a cathode ray tube, and more particularly, in a cathode ray tube using a rectangular deflection yoke, a funnel of a cathode ray tube for improving the performance of getter flashing in manufacturing a cathode ray tube by reducing the thickness of an antenna getter contact portion. It is about.

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. ) And a shadow mask (3) for sorting colors to emit a predetermined phosphor, and a frame for supporting the shadow mask (3), the electron gun (11) that is the source of the electron beam (6) that emits the fluorescent surface (4). It consists of an assembly (7), and a reinforcing band (12) wrapped outside the funnel (2) to ensure safety.

A spring (8) for coupling the frame assembly (7) with the shadow mask (3) to the funnel (2), and an inner shield for shielding so that the cathode ray tube is less affected by an external geomagnetic field during operation, is main It is sealed with high vacuum while fixed to the frame.

Referring to the operation principle of the color cathode ray tube disclosed in Figure 1 as follows.

In the electron gun embedded in the neck of the funnel 2, the electron beam 6 strikes the fluorescent surface formed on the inner surface of the panel 1 by the anode voltage applied to the cathode ray tube, before the electron beam reaches the fluorescent surface. The deflection yoke 5 is deflected up and down and left and right to form a screen.

In addition, there are 2, 4, and 6 pole magnets that modify the trajectory of the electron beam 6 so as to strike a predetermined phosphor, thereby preventing poor color purity.

Since the cathode ray tube is made of high vacuum, it can easily be deflated due to external impact. Thus, the reinforcement band 12 is attached to the skirt of the funnel 2 to disperse the stress of the cathode ray tube in a high vacuum state. Secure impact performance.

2 shows the configuration of the funnel of the cathode ray tube.

As shown in FIG. 2, the funnel 2 includes a body portion, a cone portion, and a neck portion, and a portion where the funnel 2 is joined to the panel 1 is called a seal line. The distance from the seal line to the outer surface of the panel (funnel height) is called OAH.

The funnel 2 configured as described above is characterized in that it is formed with the same thickness in order to secure the vacuum strength from the yoke portion to the body portion and to improve the funnel formability.

In the current case of the cathode ray tube, it is a trend to require the development of a low-power, slimmer model. Accordingly, as shown in FIG. 3, the cone portion 2b of the funnel of the cathode ray tube generally has a non-circular rectangular shape.

However, as the cone portion 2b of the funnel has a quadrangular shape, the margin between the actual path of the electron beam and the inside of the funnel is gradually reduced, and thus the inside of the cone portion of the funnel is attached to improve the vacuum degree of the cathode ray tube. Using the antenna getter causes the beam path to be distorted, resulting in a failure to obtain the SMC characteristics desired by the user.

The SMC refers to a characteristic that is measured by quantitatively measuring the degree of distortion of an image generated at the lower end of the screen.

In addition, during the getter flashing process of evaporating the barium of the getter to remove the residual gas to improve the degree of vacuum during the cathode ray tube manufacturing process, the adhesion of the working coil, which is a device for evaporating the barium of the getter attached to the cone-shaped cone of the funnel, is increased. Will fall.

Barium may not be effectively evaporated due to a decrease in the adhesion of the working coil, thereby lowering the vacuum degree, which is one of the main characteristics of the cathode ray tube, resulting in a decrease in the life of the cathode ray tube.

Accordingly, an object of the present invention is to solve a conventional problem, in a cathode ray tube using a rectangular deflection yoke, by reducing the thickness of the cone portion of the funnel to which the antenna getter is attached to extend the life of the cathode ray tube and the bottom of the screen Its purpose is to reduce screen distortion.

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

2 is a view showing a configuration of a funnel of the cathode ray tube.

3 is a view showing a funnel shape having a rectangular cone portion;

4 is a graph showing the thickness according to the position of the funnel cone portion according to the present invention and the thickness according to the position of the funnel cone portion according to the prior art.

5 is a graph showing the scattering amount of the getter according to the thickness ratio value obtained by dividing the cone portion thickness at the 40 mm point on the reference line RL by the cone portion thickness RL on the reference line according to the present invention.

6 is a graph showing the amount of SMC according to the thickness ratio value of the cone portion thickness divided by the cone portion thickness RL on the reference line 40 mm in the reference line RL according to the present invention.

7 is a graph showing the vacuum intensity according to the thickness ratio value of the cone portion thickness divided by the cone portion thickness RL on the reference line 40 mm in the reference line RL according to the present invention.

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

2: funnel 2a: body part of the funnel

2b: cone portion of funnel 2c: neck portion of funnel

The present invention for achieving the object as described above, the panel provided with a fluorescent surface on the inner surface, the fusion of the funnel and the funnel consisting of a body portion, a rectangular cone portion, and a neck portion fused using frit glass on the back of the panel A cathode ray tube including a getter attached to an inside of a cone portion to improve a vacuum degree of the cathode ray tube, wherein a portion having a thickness smaller than the cone portion thickness on the reference line is between 30 mm and 50 mm from the reference line of the funnel cone portion to the screen. It is characterized by one or more.

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

As described in the related art, the cathode ray tube has a tendency to become low in power and slim in general, and for this purpose, the non-circular shape of the funnel cone portion of the cathode ray tube should be made.

The shortened size of the rectangular cone portion 2b of the funnel as shown in FIG. 3 is a factor influencing the horizontal deflection due to the deflection yoke, and in the case of more than a predetermined size, it is impossible to realize the low power required by the consumer.

Therefore, as the shortened size of the rectangular cone portion of the funnel is fixed, it is required to secure the margin of the antenna getter attached to the inside of the cone portion of the funnel to improve the vacuum degree of the cathode ray tube, and the antenna is fixed at the fixed shortened size of the funnel cone portion. The getter needs to reduce the thickness of the funnel cone to make room.

However, decreasing the thickness of the funnel cone portion results in deterioration of the explosion-proof property, which is one of the main characteristics of the cathode ray tube.

The present invention improves the life characteristics of the cathode ray tube by improving the vacuum degree of the cathode ray tube by improving the SMC and the getter flashing efficiency, which is an image distortion occurring at the lower end of the screen by securing a marginal space of the short portion of the funnel cone portion. will be.

According to the present invention, at least one portion having a cone portion thickness smaller than the cone portion thickness on the reference line is formed between 30 mm and 50 mm from the reference line of the funnel cone portion to the screen, and where the cone portion thickness smaller than the cone portion thickness on the reference line is formed. The head portion of the antenna getter containing the components is located.

In addition, the cone portion thickness T2 and the reference line thickness RLT 40 mm from the reference line of the funnel cone portion satisfy the range values of 0.8 < T2 / RLT < 1.8.

In the above range, an image generated at the lower end of the screen when the cone thickness T2 and the reference line thickness TLT 40 mm from the reference line of the funnel cone portion satisfies the range of 1.2 <T2 / RLT <1.5. It is more effective in improving SMC and getter flashing.

The thickness RLT of the reference line is 2.4 mm or less and 4.5 mm or more.

4 is a graph showing the thickness according to the position of the funnel cone portion according to the present invention and the thickness according to the position of the funnel cone portion according to the prior art.

As shown in FIG. 4, it can be seen that the thickness of the cone portion at a point of 30 mm to 50 mm in the reference line RL on which the antenna getter is generally placed is reduced according to the present invention.

In the reference line RL according to the present invention, the antenna getter is attached to the cone part of the funnel at the point of 30 mm to 50 mm, and the scattering amount of the getter is measured as shown in FIG. 5.

FIG. 5 is a graph showing the scattering amount of a getter according to a thickness ratio value obtained by dividing a cone portion thickness of a 40 mm point on a reference line RL by a cone portion thickness RL on a reference line according to the present invention.

In FIG. 5, the ratio of the thickness forming the x-axis is a value obtained by dividing the cone thickness at a point of 40 mm in the reference line RL by the cone thickness RL on the reference line, and the y axis is a measure of the amount of scattering of barium.

As shown in FIG. 5, it can be seen that as the value of the thickness ratio obtained by dividing the cone thickness at the 40 mm point in the reference line RL by the cone thickness RL on the reference line increases, the scattering amount of the getter decreases.

In particular, when the thickness ratio value obtained by dividing the cone portion thickness of 40 mm from the reference line RL by the cone portion thickness RL on the reference line is 1.5, it is possible to secure a scattering amount of 300 mg or more that satisfies the vacuum degree of the 32-inch cathode ray tube.

In addition, when the thickness ratio value obtained by dividing the cone thickness of 40 mm from the reference line RL by the cone thickness RL on the reference line is 1.3 or less, it satisfies 320 mg or more, which is a scattering quantity that satisfies the vacuum degree of the 32-inch flat cathode ray tube in mass production. Can be.

FIG. 6 is a graph showing the amount of SMC according to the thickness ratio value obtained by dividing the cone thickness at a 40 mm point on the reference line RL by the cone thickness RL on the reference line.

As the shrinkage of the image is generated at the lower end of the screen as the shortened size of the funnel cone portion of the cathode ray tube is reduced, as shown in FIG. 6, the cone portion thickness of 40 mm from the reference line RL is determined as the cone portion thickness RL on the reference line. SMC does not occur when the thickness ratio divided by) is 1.4 or less, and when the thickness ratio divided by the cone thickness (RL) of 40 mm from the reference line (RL) is greater than 1.8, the SMC does not occur. If the amount is larger than 0.3mm, the distortion of the screen can be recognized.

FIG. 7 is a graph illustrating vacuum intensity according to a thickness ratio value obtained by dividing a cone thickness of a 40 mm point on a reference line RL by the cone thickness RL on a reference line according to the present invention.

When the thickness of the funnel cone portion is reduced in order to increase the scatter of the getter and reduce the amount of SMC, the uniaxial thickness of the cone portion, which is a relatively weak tensile strength, may be reduced, thereby making it vulnerable to vacuum strength.

As shown in FIG. 7, when the thickness ratio value obtained by dividing the cone portion thickness of the 40 mm point from the reference line RL by the cone portion thickness RL of the reference line is 0.8 or less, the vacuum strength becomes 8 Mpa or more, and thus the general strength of the funnel cone portion The upper limit of 8 Mpa or less, and when the thickness ratio of the cone portion thickness divided by the cone portion thickness RL on the reference line 40mm in the reference line (RL) is 1.2 or more can satisfy the stable level of 7Mpa or less.

If the thickness ratio value obtained by dividing the cone portion thickness of the 40 mm point in the reference line RL by the cone portion thickness on the reference line outside the scope of the present invention is 0.8 or less, as shown in FIG. 7, the explosion-proof characteristic is 8 Mpa or more. When the thickness ratio value obtained by dividing the cone thickness at the 40 mm point in the reference line RL by the cone thickness RL on the reference line exceeds 1.8, as shown in FIG. 6, the SMC is 0.3 mm or more. You can recognize the distortion of the.

Therefore, according to the present invention, in a cathode ray tube using a rectangular deflection yoke, the cathode tube is improved by effectively evaporating barium in the getter flashing process to improve the vacuum degree of the cathode ray tube by securing the marginal space of the shortened portion of the funnel cone portion. There is an effect that can extend the life of the SMC and improve the SMC characteristics, which is measured by measuring the degree of distortion of the image generated at the lower end of the screen.

Claims (5)

A panel provided with a fluorescent surface on the inner side, and fused using frit glass on the rear side of the panel and attached to the inside of the cone of the funnel and the cone of the funnel composed of a body portion, a rectangular cone portion, and a neck portion to improve the vacuum degree of the cathode ray tube. In a cathode ray tube comprising a getter, And at least one portion having a thickness less than the thickness of the cone portion on the reference line between 30 mm and 50 mm from the reference line of the funnel cone portion toward the screen. The method of claim 1, And a cone thickness of 40 mm from the reference line of the funnel cone portion toward the screen is T2, and when the thickness of the reference line is referred to as RLT, the following formula, 0.8 <T2 / RLT <1.8, is satisfied. The method of claim 2, And a cone thickness (T2) of 40 mm from the reference line of the funnel cone portion toward the screen and a thickness (RLT) of the reference line satisfy the following formula, 1.2 < T2 / RLT < 1.5. The method according to claim 1 and 2, The cathode ray tube, characterized in that the thickness (RLT) of the reference line satisfies the following equation, 2.4mm <RLT <4.5mm. The method of claim 1, Cathode ray tube, characterized in that the antenna getter is attached to the small portion.