KR960001830Y1 - Anti-implosion of crt - Google Patents

Abstract

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Description

Explosion proof band of CRT

Figure 1 is a side view showing the configuration of the explosion-proof band of the CRT, in particular the antistatic film formed

2 is a plan view showing the stress state of the CRT during bending of the explosion-proof band

3 is an exploded perspective view showing the configuration of the explosion-proof band of the present invention

4 is a partially enlarged side view of the combined state of the explosion-proof band of the present invention.

* Explanation of symbols for main parts of the drawings

1: explosion-proof band 2: short side of explosion-proof band

3: Long side (of explosion-proof band) 4: Extension part

5: bent portion B: CRT

P: panel

The present invention relates to the manufacture of CRT, and more particularly to an explosion-proof band (防爆 band) to prevent the expansion (implosion).

The cathode ray tube B shown in FIG. 1 is a kind of cathode ray tube which displays an image by selectively emitting a fluorescent surface with an electron beam generated from an electron gun. Such a CRT should be manufactured in a high vacuum state for stable generation and acceleration of an electron beam.

Accordingly, the Brown tube B is deformed by the panel P and the funnel F being compressed by the external atmospheric pressure and the skirt of the panel P outer periphery expanded outward. Such deformation may be supported by the strength of the brown tube (B) if it is in a normal state, but cracks are rapidly spread and deflated when there is a groove in the brown tube (B) or an external shock is applied to the brown tube (B). Problem occurs. As a result, the explosion-proof band 10 is wound on the outer periphery of the panel P with a predetermined tensile force to suppress expansion of the panel P skirt and to reinforce the C tube.

On the other hand, when an antistatic film or the like is formed on the surface of the CRT, a conductive tape is formed between the panel P and the explosion-proof band 10 in order to discharge the charge of the antistatic film. 11) Attach and connect the ground wire to lug (Iug: 12) of explosion-proof band 10.

However, since the explosion-proof band 10 is forcibly restraining the skirt of the panel P which is going to expand outward, very complicated stress is distributed on the outer periphery of the panel P as shown in FIG. In other words, the pressing stress is applied to the central portion of the long side and the short side of the panel P, and the tensile stress acts to balance the compressive stress at the corner portion between the long side and the short side. Therefore, the conventional explosion-proof band 10 can achieve the overall reinforcement of the CB, but the imbalance of such local stress due to the strain restraint of the explosion-proof band 10 can not be reinforced. Therefore, even if it is reinforced with the explosion-proof band 10, the shrinkage by local impact of the C tube | tube B, such as a panel P corner part, is still generated.

In view of such a conventional problem, an object of the present invention is to provide an explosion-proof band capable of reinforcing not only the overall reinforcement of the CRT but also the local stress imbalance accompanying the overall reinforcement.

Another object of the present invention is to provide an explosion-proof band for forming a ground path on the antistatic film, in particular, in a CRT formed antistatic film, without a separate connection means such as a conductive tape.

In order to achieve the above objects, the explosion-proof band according to the present invention is a explosion-proof band that is wound around the panel outer periphery of the CRT in a CRT,

At least one side of the long side or short side of the explosion-proof band has an extension portion formed to a height greater than the other side,

The tip of the extension portion is bent to be in contact with the face side end of the panel of the CRT.

According to a preferred feature of the present invention, the remaining one side is also provided with an extended portion, both the long side and the short side are in contact with the side end of the panel.

According to another preferred feature of the present invention, such an explosion-proof band is banded to the CRT in a shrinkage banding manner, and the extension portion is formed on the short side where the stress distribution is more complicated.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 3, the present invention explosion-proof band 1 to be fitted to the outside of the panel P of the Braun tube B is manufactured separately in the shape of a square, and the band of the short side 2 extends upwards to extend the extension portion 4. ), The short side 2 is configured to have a height greater than that of the long side 3.

The front end of the extension part 4 is bent inward to form the bent part 5, so that the bent part 5 has a side end of the face A of the panel P of the C tube when the bending is completed. It is intended to be in contact with and reinforce it.

The explosion-proof band 1 is mounted on the outer circumference of the brown tube B in a heat shrink banding manner. Preferably, this banding is performed in an exhaust path through which the brown tube B is exhausted and sealed. The exhaust path is maintained at a considerable temperature for the efficiency of the exhaust, and the exhaust and the sealed state is most suitable for banding because the high vacuum of the CB is completed. That is, when the brown tube B is exhausted while sealing the exhaust pipe as it proceeds, the explosion-proof band 1 is thermally expanded by the temperature in the scraping furnace and is covered on the brown tube B as shown in FIG. ) Is discharged from the exhaust path and cooled, the explosion-proof band (1) is also cooled down and contracted to tighten the outer periphery of the panel (P) of the Braun tube (B) to a predetermined tensile force. At this time, since the bent portion 5 of the short side 2 extending portion 4 is in contact with the panel P side end of the C tube B, the explosion-proof band 1 is an enhancement C tube B without a separate position adjusting means. Will be banded at a certain position.

At this time, since the bent portion 5 of the explosion-proof band 1 comes into contact with the side end of the panel P, when an antistatic film is formed on the surface of the panel P, the antistatic film is an explosion-proof band ( 1) and the connection is made. Accordingly, by simply connecting the appropriate ground wire to the explosion-proof band 1, the accumulated charge of the antistatic film can be discharged as it is.

As such, according to the present invention, local reinforcement as well as global reinforcement of the CRT may be provided to more fully prevent the risk of deflation. It is also possible to provide a ground path of the antistatic film directly.

Accordingly, this proposal has an effect of greatly improving the stability and productivity of the CRT.

Claims (2)

In the explosion-proof band which is banded on the outer periphery of the CRT panel to prevent the shrinkage, At least any one of the short side 2 or the long side 3 includes a lead 4 having a height greater than the remaining one, Explosion-proof vane of the CRT, characterized in that the bent portion (5) is formed at the tip of the extension (4) in contact with the face (A) side end of the panel (P). The method of claim 1, Explosion-proof band of the CRT, characterized in that the extension portion (4) is formed on both the short side (2) and the long side (3).