JPH0131654B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a cathode ray tube heat treatment jig with an improved panel glass support member. Figure 1 shows the panel glass before the fluorescent surface part is formed.
The figure shows the panel glass after the fluorescent surface portion has been formed. In the figure, 1 is a panel glass, 2 is a panel pin, 3 is a shadow mask, and 4 is a fluorescent surface section. In general, in some types of cathode ray tubes, the panel glass 1 on which the fluorescent surface portion 4 is formed and the funnel glass (not shown) that houses the electron gun are processed separately until midway through the process, and then both are assembled. When a cathode ray tube is completed, the panel glass 1 in particular usually undergoes two heat treatment steps before being assembled with the funnel glass. That is, with the shadow mask 3 attached to the panel pin 2 provided on the panel glass 1 as shown in FIG.
Heat treated at a high temperature of 500℃. Thereafter, as shown in FIG. 2, a fluorescent surface portion 4 is formed on the inner surface 1c of the panel glass 1. The state is shown in detail in FIG.
b and an aluminum film 4c. Then, in the state shown in Fig. 2, heat treatment is performed again at a high temperature of 400 to 500°C.In addition to the previous heat treatment, these heat treatment operations are performed by attaching the panel glass 1 to the heat treatment jig 6 as shown in Fig. 4. Do it in a state where
That is, in the state shown in Figure 4, it is put into a continuous furnace (not shown) whose temperature is controlled to a preset high temperature, and after a certain period of time, it is taken out from the continuous furnace to complete the heat treatment. . FIG. 5 shows a state in which the panel glass 1 is attached to another type of heat treatment jig 9, and the heat treatment work is no different from that described above. By the way, as can be seen from FIGS. 4 and 5, the sealing surface 1a and side surface 1b of the panel glass 1 are supported by the support members 7 and 10, 11 relative to the fixtures 8, 12, respectively. The characteristics of these supporting members 7, 10, and 11 greatly influence the yield of the heat treatment operation and the quality of the completed cathode ray tube. That is, these supporting members 7,
If 10 and 11 are excessively hard, defects such as scratches and cracks will occur on the sealing surface 1a and side surface 1b, causing glass breakage. On the other hand, if the tube is too soft, it will wear out significantly and have a short lifespan, and the dust will enter the cathode ray tube and cause serious trouble. Furthermore, if the cathode ray tube is operated at a high voltage, it will cause dielectric breakdown at that point, causing the cathode ray tube itself to become defective. Therefore, various types of supporting members have been studied and put into practical use. Examples include asbestos tape, asbestos cement, and boron nitride. Although asbestos tape is good for scratches and cracks, it tends to generate dust, which is a problem not only in terms of yield and quality, but also in terms of health and safety. be. Asbestos cement does not easily generate dust, but it is hard and prone to defects such as scratches and cracks. Accumulated boron is good for scratches, cracks, etc., but if it adheres to the sealing surface 1a, it impairs the insulation at that location, and in addition, it is very expensive, making it difficult to put into practical use. As mentioned above, each of the conventional products has its drawbacks, and in reality, there is no material that satisfies all of them, so the reality is that they are used with the knowledge of these drawbacks. The present invention aims to provide a heat treatment jig that can substantially eliminate the above-mentioned conventional drawbacks. Examples of the present invention will be described below. The heat treatment jig according to the present invention is characterized by its support member, which is made of a heat-resistant insulator formed by heating and press-molding a mixture of mica powder, boric acid, and zinc oxide, which has never been seen before. The properties of the support member are shown in Table 1 (compared with boron nitride).

【table】

[Table] As is clear from the characteristics in Table 1, the good points of boron nitride are almost the same in the present invention, and the bad points have been improved. Therefore, if a support member having the structure of the present invention is used in place of a conventional support member such as boron nitride, heat treatment can be performed that eliminates the drawbacks of the conventional support member. FIG. 6 shows the support member 14 and jig main body 1 having the above configuration.
The panel glass 1 is shown attached to a heat treatment jig 13 made up of 5 parts. As is clear from the same figure, this support member 7 of the conventional jig 6 shown in FIG.
It is only necessary to replace the support member 14 with the above structure, and it can be easily applied to another type of support member 14 shown in FIG. In this way, in the jig 13 having the above structure, the support member 14 has excellent machinability, so the conventional jig bodies 8 and 12 can be used as they are, and the jig 13 can benefit from the excellent characteristics shown in Table 1. Can be done. In other words, there are no scratches or cracks, very little dust is generated, and it also has excellent electrical insulation, which improves the yield of heat treatment work and makes it possible to manufacture extremely high-quality cathode ray tubes. Summer. In addition, since it is inexpensive and has little wear and tear, maintenance work can be saved, and there is no risk of pollution such as asbestos. As described above, the present invention provides a heat treatment jig that can contribute to the production of highly reliable cathode ray tubes by constructing the supporting member of the panel glass with a molded body of a mixture consisting of mica powder, boric acid, and zinc oxide. can be provided.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the panel glass before the fluorescent surface part is formed, Fig. 2 is a sectional view showing the panel glass after the fluorescent surface part is formed, and Fig. 3 is a partially enlarged cross section of the fluorescent surface part in Fig. 2. Figures 4 and 5 are cross-sectional views showing the panel glass shown in Figures 1 and 2 attached to a different type of conventional heat treatment jig, and Figure 6 is a cross-sectional view of the panel glass shown in Figures 1 and 2. FIG. 2 is a sectional view showing a state in which the panel glass shown in FIG. 1 is attached to a heat treatment jig according to the present invention. 14...Supporting member, 15...Jig main body. In addition,
The same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. In a jig for high-temperature heat treatment of panel glass, the support member that supports the side surface of the panel glass and the sealing surface of the panel glass on the jig body is made of a heat-resistant material made of a mixture of mica powder, boric acid, and zinc oxide that is heated and pressed. A cathode ray tube heat treatment jig characterized by being made of an insulator.