KR20050091400A - Cathode ray tube - Google Patents

Abstract

The present invention relates to a panel for a color cathode ray tube that can reduce the damage threat in the heat treatment process and improve the luminance characteristics by using a panel formed by a constant relationship, wherein the outer surface is flat and the inner surface has a constant curvature. In a color cathode ray tube comprising a panel, a funnel mounted to the rear of the panel and an electron gun inserted into the neck portion of the funnel to emit an electron beam toward a screen and a deflection yoke for deflecting the electron beam emitted from the electron gun up, down, left and right The panel has a light transmittance (Tp) in the center of the range of 75% to 85%, the thickness (CFT) is formed to have a range of 9.0mm to 10.9mm, thereby preventing breakage of the cathode ray tube in the heat treatment process. And increase productivity, and also reduce the brightness of the panel by reducing the thickness of the center portion of the panel. To improve the sex, because there is an effect that it is possible to increase the reliability and competitiveness of the products.

Description

 Color Cathode Ray Tube {Cathode Ray Tube}

The present invention relates to a color cathode ray tube, and more particularly, to a color cathode ray tube capable of improving breakage in a heat treatment process and brightness uniformity of the cathode ray tube by forming a panel satisfying a predetermined relational expression.

A common color cathode ray tube is a panel which is a front glass and a funnel which is a rear glass, and a fluorescent surface is coated on an inner surface of the panel to play a predetermined light emission, an electron gun for emitting an electron beam that emits the fluorescent surface, and An electron beam emitted from the electron gun includes a shadow mask that selects colors to emit the phosphor.

Therefore, the color cathode ray tube configured as described above hits the fluorescent surface formed on the inner surface of the panel by the anode voltage applied to the cathode ray tube, the electron beam emitted from the electron gun embedded in the neck portion of the funnel, At this time, the electron beam is deflected up, down, left, and right by the deflection yoke before reaching the fluorescent surface to implement an image.

In addition, since the color cathode ray tube is formed in a high vacuum state, the panel is designed to have a strength structure capable of withstanding atmospheric pressure because it can be easily expanded to an external impact, and a reinforcing band is mounted on the skirt portion of the panel. Therefore, the stress received by the cathode ray tube in a high vacuum state is dispersed to ensure impact resistance.

 However, the color cathode ray tube is subjected to a process of inserting the electron gun into the neck portion of the funnel, forming a vacuum state through an exhaust process, and then encapsulating the bulb and the panel and the funnel when the bulb is in a vacuum state. The compressive force of, and the phenomenon causes a problem that excessive stress is applied to a specific position of the screen.

In addition, since the panel is becoming larger and planarized, the thickness of the panel is further increased in order to disperse the generated stress, thereby increasing the weight of the panel, thereby increasing the manufacturing cost of the panel. .

In particular, the planar panel exceeds the limit stress of the panel against thermal changes of the inner and outer surfaces due to the difference in thermal conductivity of the panel in the heat treatment process during the cathode ray tube manufacturing process as the thickness increases from the center to the outer, This not only carries the risk of breakage, but also reduces the brightness of the panel.

At this time, as a method for preventing the luminance of the panel from being lowered, there is a method of increasing the width of the phosphor. However, in order to increase the coating size of the phosphor in a panel having a limited effective screen, the phosphor and the phosphor are increased. It is necessary to form a narrow width of the black matrix to distinguish, which will cause a problem that leads to a decrease in color purity.

The present invention has been made to solve the above problems of the prior art, by using a panel formed by a constant relationship, to reduce the risk of breakage in the heat treatment process, and to improve the color characteristics of the cathode ray tube The purpose is to provide.

Color cathode ray tube according to the present invention for solving the above problems is a flat outer surface and the inner surface is a panel having a constant curvature and a funnel mounted on the rear of the panel and inserted into the neck portion of the funnel emits an electron beam toward the screen In a color cathode ray tube comprising an electron gun and a deflection yoke for deflecting the electron beam emitted from the electron gun up, down, left, and right, the panel has a light transmittance (Tp) in the center of 75% to 85%, the thickness of the center (CFT) is characterized in that it is formed to have a range of 9.0t to 10.9t.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. 1 is a view showing the configuration of a color cathode ray tube according to the present invention, Figure 2 is a view showing the structure of a panel of a color cathode ray tube according to the present invention.

The color cathode ray tube according to the present invention includes a panel 1 which is a front glass, a funnel 2 which is a rear glass, a shadow mask 3 for selecting an electron beam emitted by an electron gun, and the electron beam 6 up, down, left, and right. And a deflection yoke 5 for scanning.

The deflection yoke 5 is composed of a plurality of coils and electromagnets to scan the electron beam 6 emitted from the electron gun up, down, left and right so that an electrical signal is reproduced in a two-dimensional image in a cathode ray tube.

The shadow mask 3 allows the electron beam 6 to reach the phosphor coated on the screen 4 formed inside the panel with an electron beam 6 of three colors R, G, and B emitted from the electron gun. A plurality of electron beam passing holes are formed therethrough, and the frame supporting the shadow mask 3 and the spring and stud pins are combined to mount the shadow mask 3 to the panel 1. Is mounted within.

The funnel 2 forms a part of the vacuum container together with the panel 1, and an anode voltage supply terminal is attached and an inner conductive film is applied therein, so that the anode is formed on the final electrode of the shadow mask 3 and the electron gun. Supply the voltage.

In this case, the panel 1 is a portion corresponding to a screen in which image information is converted into final visual information, and the thickness a of the inner and outer surfaces of the center portion of the panel 1 has a range of 9.0 mm to 10.9 mm. The light transmittance Tp at the center of the panel is formed to range from 75% to 85%.

In addition, even if the black matrix of the panel periphery is not reduced, the brightness uniformity, which is a difference between the luminance of the center of the panel and the luminance of the periphery of the panel, can be maintained at 50% or more, which is typically required by buyers. In order to improve the color purity deterioration due to the shrinking of the black matrix, the peripheral transmittance of the panel is formed to have a range of 65% to 75%.

Therefore, the panel according to the present invention is formed as described above can improve the brightness of the center portion of the panel 3% to 5% compared to the color cathode ray tube to which the existing panel is applied, so that the brightness generated as the thickness of the panel center portion increases The problem of degradation can be overcome.

In addition, the distance from the center of the outer surface of the panel to the engaging surface with the funnel is formed in the range of 75mm to 95mm, especially when formed in the range of 81mm to 87.7mm, the panel is damaged in the heat treatment process. Not only can it be prevented, but the cost is reduced.

On the other hand, in the case of a general color cathode ray tube, X-ray rays are emitted to the outside through the panel due to the emission of the electron beam by the electron gun, but the actual amount is very small, but the upper limit is set as the standard for safety. Therefore, in the case of the panel applied to the color cathode ray tube according to the prior art, the thickness of the central portion of the panel was manufactured to a minimum of 11.5 mm due to the limitation of X-ray standard.

However, at present, the above problem can be adjusted by changing the composition of the heavy metal used as the raw material of the panel, and if the panel is less than 9.0 mm, the weight composition ratio of the heavy metal into the raw material of the panel increases. Structurally reducing the thickness of the center portion of the panel is weighted by the specific gravity of the heavy metal, so that the thickness (a) of the center portion of the panel is formed to have a range of 9.0mm to 10.9mm, especially 9.2mm to 10.3mm It is preferable.

In addition, when the thickness b of the end of the panel effective screen is formed to be smaller than 18.0 mm, the vacuum stress applied to the periphery of the panel increases, so that the explosion-proof property, which is a safety characteristic of the panel, is greatly reduced, and is formed larger than 26.0 mm. In the case of heat treatment of the cathode ray tube, due to the difference in thermal conductivity of the panel, the thermal stress is generated and remains due to the heat change of the inner and outer surfaces of the panel, and the place where the residual stress is concentrated is easily damaged by an external impact. There is this.

Therefore, the thickness b of the panel periphery is formed to have a range of 18.0 mm to 26.0 mm, and more preferably, to a range of 20 mm to 25 mm.

In particular, when the wedge ratio, which is the thickness ratio of the peripheral portion to the center portion of the panel, is formed to be in a range of 200% to 270%, the effect of weight reduction and cost reduction of the panel can be achieved without compromising the brightness uniformity of the panel. It can be greatly improved, and when the wedge ratio is within the range of 210% to 270%, the effect can be maximized.

In addition, when the distance (c) from the stud pin (7) to the shadow mask 3 is coupled to the panel 1 to the center of the inner surface of the panel is 40mm or more, the shadow mounted on the inner surface of the panel The mask may be mounted stably, and if the length exceeds 60 mm, the length of the skirt portion of the panel is increased, so in the panel according to the present invention, the distance c between the stud pin and the center portion of the inner side of the panel is 40 mm. It is formed to have a range of to 60mm.

As described above, the color cathode ray tube according to the present invention has been described with reference to the illustrated drawings, but the present invention is not limited by the embodiments and drawings disclosed in the present specification, and is easily understood by those skilled in the art within the scope of the technical idea. Can be applied.

The color cathode ray tube according to the present invention configured as described above is configured to include a panel formed to satisfy a certain relational expression, thereby preventing breakage of the cathode ray tube in the heat treatment process and increasing productivity. .

In addition, by reducing the thickness of the center portion of the panel, it is possible to improve the brightness uniformity of the panel, there is an effect that can increase the reliability and competitiveness of the product.

1 is a view showing the structure of a color cathode ray tube according to the present invention;

2 is a view showing the structure of a color cathode ray tube panel according to the present invention.

<Explanation of symbols on main parts of the drawings>

1: panel 7: stud pins

Claims (12)

The outer surface is flat and the inner surface has a constant curvature, a funnel mounted to the rear of the panel, an electron gun inserted into the neck of the funnel to emit an electron beam toward the screen, and an electron beam emitted from the electron gun up, down, left, and right In the color cathode ray tube comprising a deflection yoke for deflecting to The panel is a color cathode ray tube, characterized in that the light transmittance (Tp) and the thickness (CFT) of the center portion satisfies the following relationship. 75% ≤ Tp ≤ 85% 9.0 mm ≤ CFT ≤ 10.9 mm The method of claim 1, The panel is a color cathode ray tube, characterized in that the thickness of the central portion (CFT) further satisfies the following relationship. 9.2 mm ≤ CFT ≤ 10.3 mm The method of claim 1, The panel is a color cathode ray tube, characterized in that the thickness (Tf) of the effective screen end satisfies the following relation. 18.0 mm ≤ Tf ≤ 26.0 mm The method of claim 3, wherein The panel is a color cathode ray tube, characterized in that the thickness (Tf) of the effective screen end further satisfies the following relationship. 20 mm ≤ Tf ≤ 25 mm The method of claim 3, wherein The panel is a color cathode ray tube, characterized in that the wedge ratio (Rw), which is the ratio of the thickness of the peripheral portion to the central portion, satisfies the following relationship. 200% ≤ Rw ≤ 270% The method of claim 5, The panel is a color cathode ray tube, characterized in that the wedge ratio (Rw), which is the ratio of the thickness of the peripheral portion to the central portion, further satisfies the following relationship. 210% ≤ Rw ≤ 270% The method of claim 5, The panel is a color cathode ray tube, characterized in that the distance (OAH) from the outer center portion to the portion engaging with the funnel satisfies the following relationship. 75 mm ≤ OAH ≤ 95 mm The method of claim 7, wherein The panel is a color cathode ray tube, characterized in that the distance (OAH) from the outer center portion to the portion engaging with the funnel further satisfies the following relationship. 81 mm ≤ OAH ≤ 87.7 mm The method of claim 7, wherein The panel is a color cathode ray tube, characterized in that the distance (Pz) from the stud pin to which the panel and the funnel is coupled to the center of the inner surface of the panel satisfies the following relation. 40 mm ≤ Pz ≤ 60 mm The method of claim 9, The panel is a color cathode ray tube, characterized in that the distance (Pz) from the stud pin to which the panel and the funnel is coupled to the center of the inner surface of the panel further satisfies the following relationship. 49 mm ≤ Pz ≤ 52.1 mm The method of claim 7, wherein The panel is a color cathode ray tube, characterized in that the ratio (Tco / Tp) of the light transmittance of the central portion and the peripheral portion satisfies the following relationship. 0.8 ≤ Tco / Tp ≤ 0.9 The method of claim 1, The shadow mask is a color cathode ray tube, characterized in that the thickness (Ts) satisfies the following relationship. 0.19 mm ≤ Ts ≤ 0.21 mm