JPS6196632A - Manufacture of cathode-ray tube - Google Patents

Abstract

PURPOSE:To distinctively curtail the time through application to manufacture of ultra-large size cathode-ray tube with high thermal capacity by carrying out the baking process for phosphor screen, heat process for flit seal and heat process for exhaustion with a single circulation of heating. CONSTITUTION:An aperture end of a funnel 5 accommodating an electron gun 3 within the neck part 4 or panel 2 is coated with glass flit material, it is specifically held with a position setting means 12 of a transfer board 30, a valve 24 is opened, a valve 25 is closed, and thereby external air is introduced into a bulb assembling body 11 from a chip tube 10. The transfer board 30 is introduced into a heating furnace for heat processing. Thereby, the baking process for the phosphor screen within the panel 2 and flit seal processing of panel 2 and funnel 5 are carried out. The valve 24 is closed, the valve 25 is opened, thereby the inside of tube is exhausted by a vacuum pump 22 and the chip tube 10 is sealed by melted material by supplying the power to a heater 21.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cathode ray tube manufacturing method suitable for use in obtaining a cathode ray tube, particularly a color cathode ray tube.

[Conventional technology]

As shown in Fig. 5, conventional cathode ray tubes in general, especially color cathode ray tubes, have a panel part (2) in which a fluorescent light direction (1) is formed on the inner surface, and a neck part in which an electron gun (3) is housed. (4), and the funnel part (5) has an opening end surface (2a
) and (5a), they are bonded and sealed using a glass lift, so-called fritted, as shown in FIG. Reference numeral (6) denotes a container containing a getter material, which is attached, for example, to the tip of the electron gun (3) via a spring (7). The getter material in the container (6) is heated and evaporated after the cathode ray tube tube is sealed, and adsorbs the gas remaining inside the tube, thereby increasing the degree of vacuum inside the tube.

To manufacture a color cathode ray tube with this configuration,
First, the panel portion (2) on which the color fluorescent surface (11) is formed is subjected to a baking process, a so-called pre-baking process, to release the binder in the phosphor coating of the fluorescent surface (1) and the phosphor. Organic matter such as an interlayer film applied between the paint film and the metal back layer formed thereon is blown away.Then, the panel part (2) is attached to the funnel part (5) at each opening end [111(
Glass lift material is applied to at least one of (28) and (5a), and both opening end faces (2a) and (5a) are coated with glass lift material.
a) are held in a predetermined positional relationship and butted against each other, and in this state frit sealing treatment, that is, heat treatment for frit attachment, is performed. After that, attach the electron gun (3) to the neck part (4).
), and a glass stem (9) provided on the base side of the electron gun (3) is welded and sealed to the open end of the neck (4). A plurality of terminal pins (8) are arranged in advance through the slam (9) in an airtight manner, and these are electrically connected to each electrode, heater, etc. of the electron gun (3). Further, a tip pipe (10) serving as an exhaust passage is previously penetrated through the center of the stem (9). Then, after the stem (9) is explosively attached to the neck (4) as described above,
The tubular body is heated again to exhaust the inside of the tubular body through the exhaust tip pipe u[ll which is arranged through the stem (9), and then the tip pipe is closed by heating and welding a part of it. That is, the tube is tipped off to maintain a high degree of vacuum inside the tube and seal it.

-1- As mentioned above, in the normal manufacturing method of cathode ray tubes, there are at least three heating steps: heat treatment for firing the fluorescent surface, heat treatment for the frit seal, and heat treatment during exhaust. These heat treatments are performed in separate heating furnaces in separate steps. The time required for each of these heat treatments is quite long as it takes a considerable amount of time to heat the tubular body to each of these treatment temperatures, resulting in a fairly long working time as a whole. For example, firing the fluorescent surface takes 200 minutes, frit sealing takes 180 minutes, and evacuation takes 120 minutes, resulting in a total working time of at least 500 minutes. This operation takes a long time because large tubes have a large heat capacity, and an extra large tube requires 15 to 20 hours in total.

In addition, as mentioned above, in the conventional method in which each heat treatment is performed sequentially, each heat treatment requires a separate working device and working area, so the total number of working devices, for example, the number of heating furnaces increases, and the total working area increases. It will also be vast.

In this way, conventionally each heat treatment was performed sequentially.
One reason is that a getter material with low heat resistance, which evaporates at a relatively low temperature, is used as the getter material mentioned above. In other words, since this getter material cannot withstand the above-mentioned firing process of the fluorescent surface or the heating in the frit seal, the encapsulation of the getter material and therefore the electron gun (3) to which the getter material container (6) is attached. ) was performed after baking treatment and high-temperature heat treatment associated with frit sealing.

[Problem that the invention seeks to solve]

As mentioned above, in the conventional general manufacturing method of cathode ray tubes, the heat treatment associated with the manufacturing process is performed sequentially, so the overall working time is long, and the manufacturing method of cathode ray tubes, such as a heating furnace, is There were problems such as requiring a large amount of equipment and a large working area.

Furthermore, if the tube body is repeatedly heated to high temperatures without implosion prevention bands, etc., thermal distortion will occur in the tube body, and implosion accidents are relatively likely to occur during or after exhaust air. There are problems such as frequent occurrence.

The present invention provides a method for manufacturing a cathode ray tube that can solve these problems.

[Means for solving problems]

In the present invention, an electron gun is accommodated at a predetermined position within the neck of the funnel portion, and a glass stem having a terminal pin thereof is heat-welded and placed at the end of the neck portion. and,
In this way, a tube assembly is constructed in which the open end surfaces of the panel portions are abutted and held in a predetermined positional relationship with each other on the open end surface of the funnel having the neck portion in which the electron gun is accommodated. The inner surface of this panel section is coated with a fluorescent surface, for example, a fluorescent surface with a metal back applied to a color fluorescent coating, but it has not yet been subjected to firing treatment, that is, heat treatment. A frit material is applied to at least one of the open end surfaces of the panel section and the funnel section. A tube assembly in which the funnel portion and the panel portion are abutted against each other in a predetermined positional relationship is constructed on a moving platform (dolly) for each tube assembly. That is, each movable table is provided with a holding means for setting and holding the funnel part and the panel part that abuts against each other in a predetermined positional relationship. Furthermore, an evacuation means, ie, a vacuum pump, is connected to this movable table for evacuating the inside of the tube assembly held by the movable table. The funnel section and the panel section are held in a predetermined positional relationship with each other, but the movable table on which the tube assembly that is not yet joined to each other is mounted is moved to the tunnel furnace. insert it inside. This tunnel furnace has a heating section in which each section is maintained at a predetermined temperature distribution, and the tube assembly is passed through the tunnel furnace relatively to perform the firing treatment on the fluorescent surface, the funnel section, and the panel. Heat bonding of the frit material between the sections, that is, frit sealing treatment, is performed during the same heating process, followed by exhaust treatment of the tube body, and the exhaust section is sealed to create a high degree of vacuum in the tube body 2. do. after that,
The getter material in the getter container is heated to a high temperature of about 800 to 900°C, for example by high frequency heating,
Gettering is performed by evaporating this.

[Effect]

As mentioned above, in the present invention, the i8+ heat-resistant getter material with excellent heat resistance is used as the getter material disposed inside the tube, and at the same time, multiple heat treatments are avoided by avoiding performing each heat treatment individually and independently. It is possible to shorten the time used for processing.

That is, the time required to raise the temperature in each heat step when each heat step is performed individually can be omitted. The larger the cathode ray tube, the greater its heat capacity, so it takes a longer time to heat up the tube.
What used to require 5 to 20 hours of work time can be reduced to about 7 hours. Furthermore, since a common heating furnace can be used as a heating furnace, it is possible to downsize the entire apparatus, reduce the working area, reduce the number of working steps, and thereby reduce the cost.

〔Example〕

An example of a method for manufacturing a cathode ray tube according to the present invention will be described with reference to FIGS. 1 to 3.

In the present invention, first, as shown in FIG. 3, the electron gun (3) is housed in the neck part (4) of the funnel part (5), and its stem (9) is inserted into the neck part (4). It is sealed to the base by fusion. In this case, the panel part (2) has not yet been joined to the funnel part (5), so the funnel part (5) and the electron gun (3) are connected to the funnel part (5).
Since this can be carried out while sufficiently observing from the opening end surface (5a)' of 5), it is possible to reliably set this at a predetermined position. In this case, the electron gun (5) includes, for example, a heat-resistant getter material, 450 ml of heat-treated
For example, a frittuple getter (5
A getter container containing an electron gun (product name manufactured by AES) is attached, and the electron gun (3) is housed in the neck part (4), so that the getter container (6) is placed in the funnel part (5). It is arranged in a predetermined position.

In the present invention, the above-mentioned electron gun (3) is arranged in a tube by setting the panel part (2) in a predetermined positional relationship with the funnel part (5)-H housed in the neck part (4). A moving platform (dolly) (30) is provided which constitutes the assembly and which can exhaust the air.

FIG. 1 is a top view of the tube assembly (11) held on the moving table (30), and FIG. 2 is a side view thereof. (12) is a setting stage for setting the pipe body assembly (11), that is, a funnel part (5) is set in a predetermined position, and a panel is placed on this funnel part (5) in a predetermined positional relationship with respect thereto. It is a positioning means for placing and holding the part (2). This setting means (12) includes a mounting plate (14) having an annular receiving part (13) into which the neck part (4) of the funnel part (5) is inserted and which receives the base side of the funnel part (5), for example. A plurality of arm parts are installed on this mounting plate (14). For example, a first arm part (15) bent in an L shape extending along two adjacent sides of the funnel part (5), and second and third arm parts installed opposite to each other on the other two sides. arm parts (16) and (17), and each arm part (15), (16), (17) has its own shape when molding the glass of the funnel part (5) and the panel part (2), respectively. It has positioning pins (18) provided on each circumferential surface that abut against a reference flat surface (not shown), and these pins (18) allow the funnel portion (5) to be aligned with the virtual axis O- 0' and at a predetermined rotation angle position with respect to this virtual axis O-0',
The panel part (2) can be positioned and held on the open end face (5a) of the funnel part (5) with the open end faces (2a) abutting each other.

A cooling means (19) and a high frequency coil (20) for high frequency heating the electrode of the electron gun (3) are arranged around the neck part (4) under the mounting plate (13). Further, a tip-off heater (21) is provided at a position corresponding to a predetermined portion of the tip tube a provided on the stem (9) on the other side. A pipe (23) connected to a vacuum pump (22) and an air introduction path (26) is connected to the tip of the tip-off tube (to) of the stem (9). This pipe (23) is provided with an on-off valve (24) that introduces and shuts off air, and an on-off valve (25) that opens and closes a connection path to the vacuum pump (22).

In such a configuration, the opening end surface (5a) of the funnel section (5) or the opening end surface (2a) of the panel section (2)
), the funnel part (5) is set and held in a predetermined positional relationship by the position setting means (12) of the moving table (30), and in this state, the position is set in the same manner. When the panel part (2) is held by the means (12), that is, the open end face (2a) of the panel part (2) is brought into contact with the open end face (5n) of the funnel part (5) via the glass frit material, and the pipe is opened. Body assembly (11
). In this state, the on-off valve (24) is opened and the on-off valve (25) is closed to introduce outside air into the pipe body assembly (11) through the tip pipe Ql. In this state, the moving table (30) is introduced into a heating furnace, for example, a tunnel furnace. In this way, heat treatment is applied to the panel part (
2) A firing treatment is performed on the fluorescent surface in the interior, and a frit sealing treatment is performed on the panel portion (2) and the funnel portion (5).

In this case, a cooling means (
In step 19), the electron gun (3) is cooled through cooling water.

In this way, the firing treatment and the heat treatment of the glass frit seal are performed simultaneously. Subsequently, the on-off valve (24) is closed, the on-off valve (25) is opened, and the inside of the tube is evacuated by the vacuum pump (22). Thereafter, the heater (21) is energized to weld and seal the tip tube αψ, thereby sealing the tube body.

Such heat treatment can be carried out by relatively moving the movable stage (30) into the tunnel furnace, as described above, and by selecting the temperature distribution in each part of the tunnel furnace. FIG. 4 shows the temperature programming of the substantial heating provided, for example, by relatively moving passage of a moving carriage (30) into a tunnel furnace. In this case, the tube body assembly (11) is heated from heating start time 1o to time 1, for example, 450° C., which is the firing treatment temperature of the light surface and the treatment temperature of the frit seal. ~t2
During this period, the above-described firing treatment and frit sealing are performed. During these processes, the electron gun is cooled by the cooling means (19). Next, the temperature is lowered from time t2, and the supply of cooling water to the cooling means (19)-1 is stopped. At the same time, the on-off valve (24) is closed, the on-off valve (25) is opened, and the vacuum pump (22) performs exhaust processing. Next, at time t3, a high-frequency current is applied to the °ζ coil (20), and an induced current is passed through each electrode of the electron gun (3) to heat them, which is a so-called gun burning process, to burn off the deposits on the electron gun, or Evaporation is performed to remove the DI for about 3 minutes, and then, at time t4, as described above, airtight sealing is performed by chip-off, that is, explosion bonding, using the heating means (21) of the chip tube αω.

In this way, the firing process of the fluorescent surface in the panel part (2) of the assembly (11) and the firing process of the panel part (2) and the funnel part (5) are performed.
), the frit sealing process is performed, and the exhaust gas inside the tube is sealed, and the cathode ray tube tube body is manufactured.

After that, outside the tube body, although not shown, an induced current is caused to flow through the getter container (6) using, for example, a high-frequency heating coil placed opposite to the getter container in the vicinity of the getter container to raise the temperature of the container by melon heating.
The getter material is evaporated and residual gas inside the tube is adsorbed to create a high degree of vacuum inside the tube. In this way, the intended cathode ray tube maintained at a high degree of vacuum is manufactured.

The cathode ray tube obtained in this way is tightened with a band to prevent implosion (not shown) around the front of the tube body, for example near or around the joint between the panel part (2) and the funnel part (5). I do.

〔Effect of the invention〕

As described above, in the present invention, the firing process of the fluorescent surface, the heating process of the frit seal, and the heat treatment for exhaust are performed in one heating process, so each heating process is performed sequentially. Compared to the conventional method, the time can be significantly reduced, and the time can be significantly reduced, especially when obtaining an ultra-large cathode ray tube with a large heat capacity. Furthermore, compared to the case where each heating operation is performed in separate heating furnaces, the overall apparatus, the working area, the work effort, etc. can be simplified. Also each heating is 8
In the case of sequential heating, cracks are likely to occur due to heat and strain due to repeated heating and cooling of the pipe, that is, through several thermal cycles, resulting in a relatively large risk of implosion accidents. In contrast, in the present invention,
By eliminating repeated temperature increases and decreases, the incidence of such implosion accidents is drastically reduced, and the incidence of defective products can be significantly reduced, as well as the dangers associated with implosion accidents. , it is possible to reduce the amount of work required to remove the glass shards from the manufacturing operation.

[Brief explanation of drawings]

1 and 2 are a top view and a side view of an example of an apparatus for carrying out the manufacturing method of the present invention, FIG. 3 is a side view of an example of a funnel portion for explaining an example of the manufacturing method of the present invention, and FIG. 4 5 is a temperature programming diagram, FIG. 5 is an exploded side view of a tube body for explaining a conventional method of manufacturing a cathode ray tube, and FIG. 6 is a side view of the cathode ray tube. (11... Fluorescent surface, (2)... Panel part, (3
)...electron gun, (4)...neck part, (5)...
...Soannel part, (20) ...Movement platform, (12
)... Setting means, (22)... Exhaust pump. Figure 4 Figure 5

Claims (1)

[Claims] A tube assembly in which the open end face of a panel part, the inner surface of which is coated with a fluorescent surface, is abutted against the open end face of a funnel part having a neck part in which an electron gun is housed, through a frit material. is provided, and with a heat-resistant getter material arranged inside the tube, the firing process for the fluorescent surface and the frit sealing process for the funnel part and panel part are performed in the same heating process in the atmosphere, and then the heated state is 1. A method for manufacturing a cathode ray tube, further comprising a step of exhausting the tube body.