JPH03179633A - Manufacture of reinforced type cathode-ray tube - Google Patents

Abstract

PURPOSE:To prevent an implosion during heated exhaustion and actual use by tightly fastening a front outer periphery of a tube with a metallic band before heated exhaustion and making the metallic band adhere to the tube with adhesive after heated exhaustion. CONSTITUTION:A fire-resistant buffer material 8 is wound around a front outer periphery of a tube 5 before heated exhaustion while the tube is fastened tightly with a metallic band wider than the heat-resistant buffer material 8 over the heat-resistant buffer material 8 and adhesive 11 is injected into a slit between the tube 5 and the metallic band 9 after heated exhaustion. In this case since the front outer periphery of the tube 5 is tightly fastened by the metallic band during heated exhaustion, an implosion of the tube 5 is avoided to prevent glass from scattering as well as since the metallic band 9 is adhered to the outer periphery of the tube 5 during actual use, an effect for preventing the implosion can be reinforced. Thus danger of the implosion of the tube 5 can be largely suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a 5-strong cathode ray tube, in which a heating and exhausting operation is performed after the tube body is tightened with a metal band for implosion prevention on the front outer periphery of the tube body.

[Conventional technology]

Normally, the front outer periphery of the tube body is tightened with a metal band to prevent implosion, which is done after the cathode ray tube is heated and exhausted. However, during the evacuation process, a pressure difference occurs between the inside and outside of the tube, which causes stress in the glass tube.Also, when the evacuation process, which was being carried out in the heating furnace at around 400°C, is completed and the tube is removed from the heating furnace, The temperature of the tube decreases rapidly, which also causes stress in the tube.

Therefore, during the heating and exhausting process (including taking it out of the furnace), if the tube is damaged or subjected to impact, there is a risk that it will suddenly break, implode, and the glass will scatter.

Conventionally, for example, as shown in Japanese Patent Application Laid-open No. 62-5533, a non-flammable cushioning material is wound around the front outer periphery of the pipe body before heating and exhausting work, and a metal band is tightened over the non-combustible cushioning material. It is proposed that.

[Problem to be solved by the invention]

The above-mentioned conventional technology is applicable not only when the non-flammable cushioning material wrapped under the metal band does not have adhesive properties, but also when the non-flammable cushioning material is impregnated with adhesive, or when the non-flammable cushioning material is coated on both or one side of the non-flammable cushioning material. Even if an adhesive was applied, the adhesive would burn during the heating and exhaust process, resulting in a loss of adhesion between the tube and the metal band, raising questions about its explosion-proof effectiveness.

The purpose of the present invention is to solve the above-mentioned problems of the reinforcement work for preventing implosion in the prior art, and to significantly suppress the risk of implosion of the pipe body during the heating exhaust work and throughout the subsequent period of actual use. The purpose of the present invention is to provide a method for manufacturing a reinforced cathode ray tube that can achieve the following.

[Means to solve the problem]

In order to achieve the above object, before heating and exhausting work, a non-flammable cushioning material is wrapped around the front outer periphery of the pipe body, and a metal band wider than the non-flammable cushioning material is tightened over the non-flammable cushioning material, After energizing exhaust, adhesive is injected into the gap between the tube and the metal band.

[Effect]

Even during the heating and exhausting process or when the tube is left to cool after the heating and exhausting process, the metal band on the front outer periphery of the tube is tightened to prevent the tube from imploding and causing the glass to scatter.

Also, since the metal band is wider than the non-flammable cushioning material, when the metal band is tightened on the non-flammable cushioning material,
A gap is created between the tube body and the metal band. Since the adhesive is injected into the gap after heating and evacuation, the metal band adheres to the outer periphery of the tube even during actual use after heating and evacuation, further enhancing the implosion prevention effect.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, first, a panel part 1 with a color phosphor screen formed on its inner surface is sealed to a funnel part 3 integrated with a neck part 2 with a low-melting glass 4 to form a tube body 5. do. Next, the electron gun assembly 7 supported by the glass stem 6 is inserted into the neck portion 2, and the stem 6 is welded and sealed to the end of the neck portion 2.

Then, around the skirt of panel part 1 or panel s
A nonflammable cushioning material 8, for example, aluminum tape, is wrapped around the entire circumference of the low melting point glass arrival part 4 of the funnel part 1 and the funnel part 2. Although it is difficult to maintain the state after wrapping with this non-combustible cushioning material 8 alone, this difficulty can be overcome by using an auxiliary member attached with adhesive. In this case, if the adhesive burns at high temperatures inside the exhaust furnace, it will cause problems such as contaminating the inside of the exhaust furnace and the cathode ray tube itself.
The auxiliary member is removed before the heating and exhausting step.

Next, the noncombustible cushioning material 8 is tightened with a metal band 9 that is wider than the nuclear noncombustible loosening material 8. This work is done as follows. The metal band 9 is formed into a frame shape by fixing both ends of the metal band in advance by welding or the like. In this case, as shown in Figure 2,
The inner circumferential length of the portion 9a corresponding to the non-combustible cushioning material 8 is determined according to the outer circumferential shape and size of the tube body 5 of the portion to be tightened, and the inner circumferential length of the portion 9b outside the non-combustible cushioning material 8 is , is formed to be thick enough to allow a constant gap in the range of 0.5 to 5111 mm over the entire circumference of the tube body 4. The frame-shaped metal band 9 thus formed is heated and expanded, fitted onto the nonflammable cushioning material 8, cooled, and tightened. ff1j By appropriately selecting and setting the material of the metal band 9 (its coefficient of thermal expansion) and the inner circumference length when formed into a frame shape,
During heating and exhausting, an excessive tl tensile stress acts on the metal band 9, causing it to yield and stretch too much, or conversely, during heating and exhausting, the metal band 9 thermally expands and acts as a tightening force.
It is possible to prevent situations such as falling off.

After that, heating and exhausting work is performed. This exhaust work is performed through an exhaust pipe 10 provided through the glass stem 6,
After exhausting, the exhaust pipe 10 is tipped off to airtightly seal it. This exhaust work is performed with the tube body 5 placed in the heating furnace as in the normal case, for example, heated to 400°C.
Do it.

After evacuation, the tubular body 5 is taken out from the heating furnace. Thereafter, as shown in FIG. 2, an adhesive 11 such as epoxy resin is injected into the gap between the metal band 9 and the tube body 5, and is cured and bonded.

Note that in the above embodiment, the metal band 90 portion 9b
is formed to be larger than portion 9a, but may be the same size. However, when a step is provided as in this embodiment, the gap between the tubular body 5 and the metal band 9 becomes larger, making it easier to inject the adhesive 11. Further, in the above embodiment, the electron gun 7 is sealed and then tightened with the metal band 9, but the metal band 9 may be tightened before the electron gun 7 is sealed. Further, in the above embodiment, the panel part 1 is sealed to the funnel part 3 and then tightened with the metal band 9. However, in some cases, the panel part 1 is tightened with the metal band 9 around the funnel part 1 in advance, and then It is also possible to seal the panel section 1 to the funnel section 3 with a low melting point glass 4.

〔Effect of the invention〕

According to the present invention, since the front outer periphery of the tube body is tightened with a metal band prior to the heating and exhausting operation, implosion can be prevented during the auxiliary operation and during rapid cooling immediately thereafter. In addition, by bonding the metal band with a suitable adhesive after heating and exhausting, the elastic shrinkage prevention effect is enhanced after heating and exhausting, including during actual use.

[Brief explanation of drawings]

1M is a partially cutaway cross-sectional side (2
) and FIG. 2 are large-scale cross-sectional views of the main parts of FIG. 1. 1...Panel part, 3...Funnel part, 5.
... tube body, 8 ... nonflammable cushioning material, 9 ... metal band, 11 ... adhesive.

Claims (1)

[Claims] 1. Before heating and exhausting work, wrap a nonflammable cushioning material around the front outer circumference of the pipe body, tighten an implosion prevention metal band that is wider than the noncombustible cushioning material, and then heat and exhaust the pipe. A method for manufacturing a reinforced cathode ray tube, characterized in that an adhesive is subsequently injected into the gap between the tube body and the metal band.