JPS61153920A - Manufacture of explosion-proof cathode-ray tube - Google Patents

Abstract

PURPOSE:To produce an explosion-proof cathode-ray tube having excellent explosion-proof effect by employing a gas burner enable of uniform heating of shrinkage fitting band. CONSTITUTION:On the position A' corresponding with the side A, small gas burners 83, 82 having diameter of phiD2 are arranged respectively at the positions of shrinkage fit band 7 where there is a folding section 71 or not. While on the position B' corresponding with the corner section B, small gas burners 83, 81 having diameter of phiD3, phiD1 are arranged respectively at the position where there are the folding section 71 and a supporting metal 6. Furthermore, small gas burner 83 having diameter of phiD3 is arranged at the position C' corresponding with the position C where there is a metal chip 10 (phiD1<phiD2<phiD3). Since the shrinkage fitting band 7 can be heated uniformly by varying the position of small burners 81-83, deformation or uneven temperature of shrinkage fitting band 7 can be eliminated resulting in high quality explosion-proof CRT.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for manufacturing an explosion-proof cathode ray tube.

[Technical background of the invention and its problems]

Usually, in a cathode ray tube, such as a color picture tube, a band is stretched over the side wall of the panel to prevent the tube from imploding.

The method for stretching this band is to heat the used part of the long band material to a predetermined temperature by heating it with an electric current or heating it with a gas burner, and then immediately wrap it around the side wall of the panel with an adhesive layer, etc. After fixing both ends by welding, etc., the structure is cooled and stretched under a predetermined stress to prevent implosion.

However, in the recently developed so-called FS tube, in which the curvature of the effective panel part is more planar than in the past, and some corners are nearly square, the method of wrapping a band around the side wall of the panel does not allow for uniform stress. is not obtained.

For this purpose, an annular shrink-fit band having an inner circumference slightly smaller than the outer circumference of the panel side wall is heated and expanded, and the panel side wall is placed opposite to the expanded shrink-fit band. By cooling the panel, it is expanded to apply uniform stress to the side wall of the panel.

However, support metal fittings are usually fixed in advance to some corners of this shrink-fit band by welding, etc., and when making a ring shape, metal pieces are applied from outside to the butt parts of both ends of the band and welding etc. I am doing it.

Furthermore, there are also bands that are flat or bent in the width direction to provide reinforcement and improve appearance. For this reason, the heat capacity of each part of the band for shrink fitting is different, so when heated from the inside with a normal gas burner.

The difference in heat capacity causes uneven heating, which not only deforms the shrink-fit band, but also prevents uniform thermal expansion, which means that when the panel is stretched on the side wall, uniform stress is not applied, resulting in explosion-proof There is a problem in that the quality of the type cathode ray tube deteriorates.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned problems, and by using a gas burner that can uniformly heat the shrink-fitting band, it is possible to obtain an explosion-proof cathode ray tube with excellent explosion-proof effects. The purpose of this research is to provide a method for manufacturing a possible explosion-proof cathode ray tube.

[Summary of the invention]

That is, the present invention includes a step of heating and expanding a substantially rectangular shrink-fit band from the inside with a gas burner, a step of arranging a panel side wall of a cathode ray tube in the heated and expanded shrink-fit band, and a step of shrink-fitting. A method for manufacturing an explosion-proof cathode ray tube comprising the steps of cooling and shrinking a band and stretching it on a side wall of a panel.

The gas burner has a large number of small gas burners that vary in proportion to the heat capacity of each part of the shrink-fit band, and the shrink-fit band can be uniformly heated by the large number of small gas burners. This is a method for manufacturing an explosion-proof cathode ray tube.

[Embodiments of the invention]

Next, an embodiment of the method for manufacturing an explosion-proof cathode ray tube according to the present invention will be described with reference to FIGS. 1 to 6.

That is, as shown in FIG. 1, a rectangular panel face part (2), a panel side wall part (3) integrally formed around the periphery of this panel face part (2), and a panel side wall part (3) ), and is installed opposite to the cathode ray tube (1), which is sealed to the tube (1) and consists of a funnel (4) and a neck (5). Shrink-fit band (
7) is provided, and the shrink fit band (7) is connected from the gas burner (8) to the inner wall of the shrink fit band (7) at a predetermined interval.
) is uniformly heated to about 450℃ to thermally expand it, then 1
For example, the shrink fit band (7) is moved in the direction of the arrow and placed so as to correspond to a predetermined position on the panel side wall (3).

Next, by cooling the shrink fit band (7),
A shrink fit band (7) is stretched over the panel side wall (3) to complete the explosion-proof cathode ray tube shown in FIG. In FIG. 2, (9) is the butt part of the band, and (10) is the metal piece used to form the shrink-fit band (7).

Next, the shrink fit band (7) applied to this embodiment will be explained with reference to FIGS. 3 and 4. In the figure, the same reference numerals as in FIGS. 1 and 2 indicate the same parts.

That is, the shrink fit band (7) has a bent part (71) at one end in the width direction, and a supporting metal fitting (6) is provided at a part of the corner, and the butt part (9) of the band is A metal piece (10) is welded on both sides with an X mark.

As can be seen from the figure, this shrink fit band (7) has a bent part (7D), a support fitting (6), and a metal piece (10), so the bent part ( The heat capacity distribution is different between the part with and without 71), and there is a bent part (71) and a support fitting (6) in the corner part (B), so the side part (A
) and the heat capacity distribution is different. Furthermore, in the CG) section, the bending section (7
1) and the metal piece (lO), the heat capacity distribution is different from that of the other side (A).

In this way, the heat capacity of the shrink-fit band (7) differs depending on the position.
7) cannot be heated uniformly.

Next, the gas burner (8) applied to this embodiment will be explained with reference to FIGS. 5 and 6.

That is, it consists of a rectangular container that allows gas to pass inside, and a third small gas burner with a diameter φD3 is located at the position (A') relative to the side (A) where the bent part (71) is located. (81), a second small gas burner (82) with a diameter φD2 is installed oppositely at a position where there is no bent part (71), and a bent part (71) is located at a position (B') relative to the corner part CB). ) and the support fitting (6), there is a third small gas burner (83) with a diameter φD3, a bent part (7I) and the support fitting (6).
) with the first small gas burner (8
I) are arranged oppositely, and the position (C) where the metal piece (10) is located
A third small gas burner (83) having a diameter of φD3 is provided at a position (C') relative to the cylinder. However, φD, <φ
Let D2 be φD3.

The method of determining the diameter φDlyφD2y φD3 and the spacing of this small gas burner (al)-(8z)-(8a) is very important, and in the case of a shrink-fitting band for a 20-inch tube, PH= as shown in Figure 6. 5mm, Pv=4m■, φD
The most appropriate dimensions are 1=1-m, φD2=1.5m, and φD3=2mm.

This varies depending on the pipe type, so it is desirable to find the optimal value in advance based on the shape of the heat-fitting band, inner circumference length, etc. By changing the temperature, the shrink-fit band (7) can be heated uniformly, so that the shrink-fit band (7) is free from deformation and temperature unevenness, and a high-quality explosion-proof cathode ray tube can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, the shrink-fit band is uniformly heated by changing the hole diameter of the small gas burner in proportion to the heat capacity of each part of the shrink-fit band, so that a high-quality explosion-proof cathode ray tube can be produced. can be provided.

[Brief explanation of drawings]

1 to 6 are diagrams showing an embodiment of the method for manufacturing an explosion-proof cathode ray tube according to the present invention, and FIG. Figure 2 is a side view of the completed explosion-proof cathode ray tube, Figure 3 is a perspective view of the shrink-fit band, Figure 4 (a) is a cross-sectional view of section A in Figure 3, and Figure 4 (b) is a cross-sectional view of section A in Figure 3. A cross-sectional view of part B in Figure 3,
FIG. 4(c) is a sectional view of part 0 in FIG. 3, FIG. 5 is a perspective view of the gas burner, and FIG. 6S(a) is an arrangement diagram of small gas burners corresponding to part A' in FIG. 5. Fig. 6(b) is an arrangement diagram of the small gas burners corresponding to section B' in Fig. 5, and Fig. 6(c)
) is an arrangement diagram of small gas burners corresponding to section C' in FIG. 3...Panel side wall part σ...Support fitting 7...
・Shrink fit band 7K...Bending part 8...Gas burner 81y 82y 83...Small gas burner 10...
Metal piece

Claims (1)

[Claims] A process of heating and expanding a rectangular shrink-fit band from the inside with a gas burner, a process of placing a side wall of a cathode ray tube panel opposite the heated and expanded shrink-fit band, and cooling and shrinking the shrink-fit band. In the method for manufacturing an explosion-proof cathode ray tube, the gas burner includes a large number of small gas burners that vary in proportion to the heat capacity of each part of the shrink-fit band. A method for manufacturing an explosion-proof cathode ray tube, characterized in that the shrink-fit band can be uniformly heated by the plurality of small gas burners.