KR100400778B1 - Color Cathode Ray Tube - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a color cathode ray tube with improved explosion-proof characteristics by improving the bonding structure of the panel.

To this end, the present invention is provided with a panel having a constant curvature on the inner and outer surfaces and when the long side thickness at the periphery of the panel t1, the short side thickness t2, the diagonal thickness t3, the height of the stud pin hs, In a color cathode ray tube having a diagonal length of 600 mm or more, 0.8 ≦ hs / t1 <1.1, 0.7 ≦ hs / t2 <1.0, and 0.5 ≦ hs / t3 <0.8 are provided.

In addition, the present invention is provided with a panel having a constant curvature on the inner and outer surfaces and when the long side thickness at the periphery of the panel t1, the short side thickness t2, the diagonal thickness t3, the height of the stud pin hs, In a color cathode ray tube having a diagonal length of 300 mm or more and 600 mm or less, a color cathode ray tube is provided, wherein 1.0 ≦ hs / t1 <1.4, 1.0 ≦ hs / t2 <1.4, and 1.0 ≦ hs / t3 <1.2.

Description

Color Cathode Ray Tube

The present invention relates to a color cathode ray tube, and more particularly to a panel structure of a color cathode ray tube.

In general, the color cathode ray tube is formed of a panel 2 having a specific radius of curvature on its inner and outer surfaces, and a cone-shaped funnel 3 encapsulated in the panel 2, as shown in FIG. An electron gun for emitting an electron beam is inserted into the neck portion 4 of the funnel 3, and the panel 2 is sealed by the funnel 3 and the frit glass serving as an adhesive. In the inside of the cathode ray tube formed of the panel 2 and the funnel 3, a shadow mask 8 which performs color screening has a curvature similar to the curvature of the inner surface of the panel and has a predetermined distance from the inner surface of the panel.

A frame 9 is provided to support the shadow mask 8, which is usually joined by welding. The combination of the shadow mask 8 and the frame 9 coupled in this way is coupled to the stud pin 11 mounted on the panel 2 by the spring 10 coupled to the frame and maintained inside the cathode ray tube.

On the other hand, the inner shield 12 made of a magnetic body to reduce the movement of the electron beam by the external magnetic field is held coupled to the frame 9 by the fixing spring 14, the electron beam (5) emitted from the electron gun (6) The deflection yoke 13, which is a deflection means for deflecting the electron beam, is mounted to the neck portion so that the light is emitted to the front surface of the fluorescent surface formed on the inner surface of the panel 2. The outside of the cathode ray tube is provided with a reinforcing band 15 to prevent injury to the human body by the debris broken by an external impact.

When the panel 2 is manufactured, the upper and lower outer molds overlap each other to form an external shape of the panel, and a certain amount of glass is introduced into the external mold, and an inner surface of the panel on which the phosphor to which the electron beam is to be blown is applied. The mold is formed at a constant distance from the external mold by applying pressure in the vertical direction to form the panel.

In this case, the panel 2 should be designed to have a sufficient thickness to withstand breakage and external impact in the vacuum and thermal process formed inside the cathode ray tube, and the thickness of the panel 2 may vary depending on the position of the inside of the panel. Value, the center thickness of the panel is called CFT (Center Face Thickness).

In the case of CFT, which is the center thickness of the panel, the thicker is effective against vacuum strength or external impact, but the thicker the CFT, the heavier the weight of the panel becomes and the weight of the entire cathode ray tube increases, resulting in a lower light transmittance of the panel. This results in a decrease in the luminance of.

On the contrary, the thinner the thickness of CFT, which is the center thickness of the panel, is disadvantageous to vacuum strength and external impact, resulting in the weakness of explosion protection, one of the safety characteristics of cathode ray tubes.

In the conventional case, as shown in FIG. 2, when the diagonal length of the panel is referred to as D, the distance from the adhesive surface 2a of the panel to the top surface of the panel is referred to as OAH, and the stud pin 11 is applied to the panel adhesive surface 2a. When the height to the center is hs, the panel thickness of the center is CT in the panel, the thickness of the panel short end is t2, and the thickness of the diagonal end corner is t3. When the panel diagonal length is 600 mm or more, hs / t1 is 1.1. As mentioned above, hs / t2 was 1.0 or more, hs / t3 was 0.8, and when the panel diagonal length was 300 mm or more and 600 mm or less, hs / t1 was 1.4-1.5, hs / t2 was 1.4 or more, and hs / t3 was 1.25 or more.

As a result, as the height hs from the panel adhesive surface 2a to the center of the stud pin 11 increases, the position of the stud pin 11 is brought closer to the outer surface of the panel, as shown in FIGS. 3 and 4. In case of external impact, the result impedes the straightness of impact energy.

In other words, the impact energy does not move to the funnel, and the impact energy is reflected back to the front of the panel, and the broken panel fragments pop out to the outside due to this energy, thereby satisfying the explosion-proof characteristics among safety standards. There was a problem that can not be.

The present invention has been made to solve the problems of the prior art, an object of the present invention is to provide a color cathode ray tube with improved explosion-proof characteristics by improving the coupling structure of the panel.

1 is a cross-sectional view schematically showing a conventional color cathode ray tube.

Figure 2 is a schematic cutaway perspective view of a panel of a conventional color cathode ray tube.

3 is a schematic view showing the impact direction to the funnel when an external impact is applied to the panel.

4 is a schematic diagram illustrating the direction of impact propagation in the panel and funnel upon movement of the stud pins;

FIG. 5 is a graph showing the relationship between hs / t3, mask binding, and fragment scattering distance in the present invention. FIG.

6 is a schematic cross-sectional view illustrating a frame and a support spring changed as the hs / OAH is changed by the present invention.

** Explanation of symbols for main parts of drawings **

2: panel 3: funnel

6: electron gun 8: shadow mask

9: frame 10: support spring

11: Stud pin 14: Fixed spring

15: reinforcement band

The present invention for achieving the above object is provided with a panel having a constant curvature on the inner and outer surfaces, the thickness of the long side portion at the periphery of the panel t1, the short side thickness t2, the diagonal thickness t3, the height of the stud pin hs In the case of a color cathode ray tube having a diagonal length of 600 mm or more, a color cathode ray tube is provided, wherein 0.8 ≦ hs / t1 <1.1, 0.7 ≦ hs / t2 <1.0, and 0.5 ≦ hs / t3 <0.8. .

In addition, the present invention is provided with a panel having a constant curvature on the inner and outer surfaces and when the long side thickness at the periphery of the panel t1, the short side thickness t2, the diagonal thickness t3, the height of the stud pin hs, In a color cathode ray tube having a diagonal length of 300 mm or more and 600 mm or less, a color cathode ray tube is provided, wherein 1.0 ≦ hs / t1 <1.4, 1.0 ≦ hs / t2 <1.4, and 1.0 ≦ hs / t3 <1.2.

The structure of this invention is demonstrated in detail, referring an accompanying drawing. For reference, prior to the description of the present invention, in order to avoid duplication of description, the same reference numerals as those of the prior art will be referred to.

In general, when conducting an explosion proof test, one of the panel's safety standards, a ball having a weight of 533 g and a diameter of 51 mm is dropped at a height of 134 cm to hit the front surface of the cathode ray tube with an energy of about 7 J. Safety is examined by the shape of cracks, the length of scattering of panel pieces and the size of panel pieces.

In this case, the impact dropping point of the ball is a part within 25 mm from the effective surface of the cathode ray tube, which is one of the strongest tensile stresses among the vacuum stress regions of the cathode ray tube.

Therefore, in general, the inside has a specific curvature, and in the case of the panel 2 having an outer diameter of 100,000 mm or more, the thickness of the panel becomes thick as it goes to the periphery compared to the CFT, which is the thickness of the center of the panel. Of course, the curvature inside the panel is closely related to the curvature of the shadow mask.

First of all, in order to improve the vacuum strength of the panel 2 and reduce the damage in the thermal process, it is necessary to first analyze the type of impact on the panel 2 during the explosion-proof experiment. appear.

That is, as shown in the figure, it was found that the position of the stud pin 11 has a great influence on the direction of impact on the panel during explosion proof experiments.

That is, the stud pin 11 serves to reflect the external impact energy, so that the impact energy does not go straight to the funnel at the time of the external impact but is reflected back to the front of the panel so that the panel is damaged during the external impact of the panel front part. The result is that the fragments stick out to the outside by the reflected energy, which results in the fragments failing to fall within the debris specification specified by the safety standard.

Therefore, the present invention provides a panel 2 having an optimal explosion-proof characteristic through the optimization of the position of the stud pin 11 with respect to the thickness of the panel 2 and the position of the stud pin with respect to the panel OAH.

In the present invention, when the panel diagonal length is 600 mm or more, 0.8≤hs / t1 <1.1, 0.7≤hs / t2 <1.0, 0.5≤hs / t3 <0.8, and when the panel diagonal length is 300 mm or more and 600 mm or less, 1.0≤ hs / t1 <1.4, 1.0 ≦ hs / t2 <1.4, 1.0 ≦ hs / t3 <1.2. First, when the panel has a diagonal length of 600 mm or more, 0.8> hs / t1, 0.7> hs / t2, 0.5> hs / t3, and when the panel has a diagonal length of 300 mm or more and 600 mm or less, 1.0> hs / t1, 1.0> In the case of hs / t2 and 1.0> hs / t3, the coupling of the shadow mask becomes worse as the stud pin is positioned too downward.

When the diagonal length of the next panel is 600 mm or more, 1.1≤hs / t1, 1.0≤hs / t2, 0.8≤hs / t3, and hs exceeds 20mm, and when the panel diagonal length is 300mm or more and 600mm or less, 1.4 If ≤ hs / t1, 1.4 ≤ hs / t2, 1.2 ≤ hs / t3 and hs exceeds 15 mm, as shown in FIG. 4, the position of the stud pin moves to the front position of the panel. This results in disturbance of straightness, which results in the impact energy not moving towards the funnel, which is reflected back to the front of the panel by reflecting the impact energy. The result came out. This results in the failure to meet the explosion-proof characteristics of safety standards.

In particular, glass fragments from external impacts can scatter onto the front of the CRT, which can pose a fatal hazard to anyone watching a monitor or television. In addition, if hs is 20 mm or more, the position of the stud pin is too close to the panel, which affects the assembly of the shadow mask, that is, the assembly of the mask and the frame supporting the mask. This results in a lowering of the mask strength.

Referring to FIG. 4 of the related art, as the position of the stud pin is moved to the panel front position, it results in the straightness of the impact energy during external impact, and the impact energy does not move toward the funnel.

5 is a comparative graph of hs / t3 value, fragment scattering distance, and mask bondability. As shown in the figure, it can be seen that when the hs / t3 value is 0.5 or more and 0.8 or less, the mask bondability is excellent and the fragment scattering distance is shortened.

In the case of hs and OAH, as shown in FIG. 6, when the diagonal length of the panel is 600 mm or more and the hs / OAH is 0.17 or less, as the OAH increases, the distance between the upper portion of the mask and the inner screen forming part of the panel increases. Therefore, in order to keep the distance constant, the support spring 10 must be made high, in which case the strength of the frame supporting the shadow mask becomes weak, and thus the shock characteristic (deformation characteristic of the shadow mask due to the drop impact). Can be reduced. On the other hand, if hs / OAH is greater than 0.2, as hs increases, the impact energy due to external impact causes the straightness worsened due to the influence of the stud pin, resulting in deterioration of explosion-proof characteristics.

Similarly to the above characteristics, in the case of a panel of a cathode ray tube having a panel diagonal length of 300 mm or more and 600 mm or less, the explosion-proof characteristic is improved when the hs / OAH according to the present invention is 0.24 or more and 0.28 or less.

The panel of the color cathode ray tube of the present invention can prevent breakage during the thermal process, and can effectively improve the vacuum strength applied to the panel and the funnel.

Claims (6)

The panel has a constant curvature on the inside and outside surfaces, and the diagonal length of the panel is 600mm when the long side thickness at the periphery of the panel is t1, the short side thickness is t2, the diagonal thickness is t3 and the height of the stud pin is hs. In the above-mentioned color cathode ray tube, Color cathode ray tube, characterized in that 0.8≤hs / t1 <1.1, 0.7≤hs / t2 <1.0, 0.5≤hs / t3 <0.8 The panel has a constant curvature on the inner and outer surfaces, and the diagonal length of the panel is 300 mm when the long side thickness at the periphery of the panel is t1, the short side thickness is t2, the diagonal thickness is t3 and the height of the stud pin is hs. In the color cathode ray tube which is more than 600 mm, Color cathode ray tube, characterized in that 1.0≤hs / t1 <1.4, 1.0≤hs / t2 <1.4, 1.0≤hs / t3 <1.2 The method of claim 1, The height hs of the stud pin is 20mm or less, characterized in that the color cathode ray tube The method of claim 2, The height (hs) of the stud pin is less than 15mm color cathode ray tube, characterized in that The method of claim 1, Color cathode ray tube, characterized in that 0.17≤hs / OAH≤0.2 when the height from the actual surface to the outer surface of the panel is OAH The method of claim 2, Color cathode ray tube, characterized in that the height from the actual surface to the outer surface of the panel is OAH, 0.24≤hs / OAH≤0.28