JPS58212029A - Production process of cathode-ray tube - Google Patents

Abstract

PURPOSE:To omit the panel-baking process, by positioning the funnel onto the panel of the captioned tube in order to fix them together by sealing and by performing the panel-baking simultaneously with the sealing. CONSTITUTION:By employing such a method as reverse to the conventional method in setting a panel 2 and a funnel 3 to a holding-base for sealing, contaminated gas is expeled outside from a funnel neck flare part 8, and the performance deterioration of frit glass 4 caused by contaminated gas is prevented. And, the constitution is set up in such a way that in the sealing process the panel-baking treatment can be also performed simultaneously so that enormous expeuse which has been consumed in the conventional panel-baking process, that is, the operation cost and equipment cost of a large-sized soaking pit, and the process cost of number of man-hour, transportation or the like becomes needless; and changing of the holding base for sealing can alone contribute to the rationalization and economization of the production process.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a color cathode ray tube, and more particularly to a method for manufacturing a cathode ray tube in which a bakeout step and a sealing step are performed in one furnace.

Crystalline frit glass, which is conventionally used for sealing panels and funnels, contains a large amount of lead oxide, so if the crystallization temperature is raised in a chemical atmosphere, metallic lead will precipitate and the electrical resistance will deteriorate. Insulation performance and vacuum sealing performance deteriorate, and furthermore, crystallization becomes insufficient and pulp strength performance deteriorates when vacuum is applied.Therefore, the inner surface is coated with a V translucent material and a metal back is The treated panels must be subjected to a process called panel baking before pricking to remove organic gases. Ta.

After completing this panel baking, he attached contact springs, electron shield tubes, and various other parts to the Shadramanuk that was fixed to the panel. Then, frit glass is applied on the sealing surface, and the funnel-shaped funnel whose inner surface is coated with graphite and the panel are fit together and sealed as shown in FIG. That is, in Fig. 1, (1) is the sealing support stand, and the panel (2) and funnel (3)
) and the fritted glass (4) right through it, is it accurate to the point where it is rejected? To support. The sealing support is attached to the furnace transport net (
5) The panel (2) and the funnel (3) are sealed by the glass (4) by heat treatment at a temperature of about 4-100 for 40 to 60 minutes.

The purpose of the present invention is to focus on the fact that the temperature sensitivity of panel baking is similar to the temperature sensitivity of the sealing process between panels and funnels, and to eliminate the panel baking process by performing panel baking at the same time as sealing. An object of the present invention is to provide a method for manufacturing a cathode ray tube.

If panel baking is performed in an untreated state using the sealing support 1 shown in FIG. 1, the frit glass 4 to be welded will be contaminated by organic gas generated from the panel. This causes the crystal structure of the frit to collapse, causing performance deterioration as described above.

In this case, the panel 2 and the funnel 3 are tilted at a certain angle of inclination θ to the sealing support base IIC as shown in FIG.

This is to prevent shifting due to vibrations, etc. during transportation in the heating furnace. For this reason, the gas caused by the organic matter stagnates in the most dense part 7 of the pulp 6, and the frit glass in this part is contaminated, causing the above-mentioned defects locally.Therefore, the present invention is designed to solve the above-mentioned gas stagnation, as shown in FIG. By setting the panel 2 and funnel 3 on the sealing support base 1 in the opposite way to the conventional method, the contaminant gas is released into the outside air through the funnel neck flare part 8, and the performance deteriorates due to gas contamination on the frit glass 4. The aim is to prevent

As described above, according to the present invention, the panel baking process is performed at the same time as the sealing process, which saves the conventional panel baking process (i.e., the operating cost of a large soaking furnace). This eliminates equipment costs, labor costs, and process costs such as transportation, and can greatly contribute to streamlining and economical manufacturing processes simply by changing the sealing support.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing a conventional panel funnel sealing method. Figure 2 is a perspective view showing the conventional panel funnel sealing method. Figure 2 shows the funnel during conventional sealing. The angle of the funnel is expressed by the stratum corneum θ. FIG. 3 is a perspective view showing the method of sealing the funnel funnel of the present invention. 1...Sealing support stand, 2...Panel, 3
... Funnel, 4 ... Fritted glass, 5 ... Conveyance net, 6 ... Valve (name of the combination of panel and funnel), 7-
...Organic gas dyeing area, 8... Part of funnel neck flare. Mi＼ Agent Patent Attorney Susumu Uchihara ~-1- Figure 2 Section 3

Claims (1)

[Claims] The sealing process involves coating the inner surface of the panel of a color cathode ray tube with a phosphor, heating it together with the funnel, and welding the two together with frit glass.The funnel is positioned above the panel and sealed. A method for manufacturing a cathode ray tube.