JPH0618105B2 - Cathode ray tube manufacturing equipment - Google Patents

Description

The present invention relates to a cathode ray tube, and more particularly to a cathode ray tube manufacturing apparatus suitable for use in obtaining a color cathode ray tube.

[Conventional technology]

As shown in FIG. 5, a conventional general cathode ray tube, particularly a color cathode ray tube, has a panel portion (2) having a fluorescent surface (1) formed on an inner surface thereof.
And a funnel portion (5) having a neck portion (4) for accommodating the electron gun (3), and the panel portion (2) and the funnel portion (5) are open end surfaces (2a) and ( 6a in 5a)
As shown in the figure, it is joined and sealed by glass frit, that is, so-called frit is applied. (6) is a container containing a getter material, and is attached to the tip of the electron gun (3) via a spring (7), for example. The getter material in the container (6) is for adsorbing the gas that is heated and evaporated after the cathode ray tube tube body is sealed and remains in the tube body to achieve a high degree of vacuum in the tube body.

To manufacture a color cathode ray tube with such a configuration,
First, the panel portion (2) on which the color fluorescent surface (1) is formed is subjected to a baking treatment, a so-called pre-baking treatment, so that the fluorescent surface
Binders in the phosphor coating film of (1) and organic substances such as an intermediate film applied between the phosphor coating film and the metal back layer formed on the phosphor coating film are removed. Then this panel section
The glass frit material is applied to at least one of the opening end faces (2a) and (5a) of the (2) to the funnel portion (5), and the opening end faces (2a) and (5a) are placed in a predetermined positional relationship with each other. Are held and abutted, and in this state, frit seal treatment, that is, heat treatment for frit attachment is performed. Then the electron gun
(3) is housed in the neck portion (4), and the glass stem (9) provided on the base side of the electron gun (3) is welded and sealed to the open end of the neck portion (4). A plurality of terminal pins (8) are preliminarily arranged in the stem (9) so as to penetrate therethrough in an airtight manner, and these are electrically connected to each electrode of the electron gun (3), a heater and the like. Further, the stem (9) has a tip tube which becomes an exhaust passage in the center thereof in advance.
(10) is penetrated. Then, as described above, after the stem (9) is welded to the neck portion (4), the pipe body is heated again and the exhaust tip-off pipe (10) penetratingly arranged in the stem (9). ) Is used to exhaust the inside of the tube, and then the tip-off tube (10) is heated and welded at a part thereof to close or tip off the tube to maintain the tube inside at a high degree of vacuum and seal it.

As described above, in the usual method for manufacturing a cathode ray tube, at least three heating processes, that is, a heating process for baking the fluorescent surface, a heating process for a frit seal, and a heating process for evacuation are performed. Thus, these heat treatments are performed in respective heating furnaces in independent steps. The time required for each of these heat treatments is a considerably long working time as a whole because it takes a considerably long time to heat and heat the tube body to each of these treatment temperatures. For example, the time required for firing the fluorescent surface is 200 minutes, the time required for frit sealing is 180 minutes, the time required for exhausting is 120 minutes, and a working time of at least 500 minutes is required as a whole. Since this work time has a larger heat capacity for larger size, it takes a long time, and for large size as a whole
It takes 15 to 20 hours.

Further, as described above, in the conventional method in which each heat treatment is sequentially performed, each work device and work area are required in each heat treatment, so that the total number of work devices, for example, the number of heating furnaces is large, and the whole work area is increased. Will also be vast.

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

[Problems to be solved by the invention]

As described above, in the conventional general method for manufacturing a cathode ray tube, since the heat treatment accompanying the manufacturing process is sequentially performed, the entire working time is long, and the manufacturing of the cathode ray tube such as the heating furnace is also performed. There is a problem in that a large work area is required and a large work area is required.

Furthermore, the tube is not subjected to an implosion-prevention band and the like, and is repeatedly heated to a high temperature to cause thermal distortion in the tube. There are problems such as many occurrences.

Then, a method of avoiding repeating such high-temperature heating and performing one-time heating to solve the above-mentioned problems has been proposed, but in this case, The influence of heating on the electrodes and cathode material in the neck becomes a problem.

The present invention provides an apparatus for manufacturing a cathode ray tube that solves these problems.

[Means for solving problems]

The device of the present invention, as shown in the plan view and the side view in FIG. 1 and FIG.
(2) and the funnel part (5) joined to this panel part (2)
Of the cathode ray tube accompanied by heating and exhaust during the manufacturing process of the cathode ray tube having the tip off tube (10) at the end portion and the neck portion (4) integrally formed with the funnel portion (5). It is a manufacturing device.

And, this device is a moving table (30) for a tube assembly (11) of a panel section (2) and a funnel section (5) having a neck section (4).
And a mounting body (14) arranged on the moving table (30) on which the pipe assembly (11) is mounted, and a cooling device (19) for the neck portion (4).
A tip-off heater (21) for heating the tip-off tube (10) to tip-off, a vacuum pump (22) connected to the tip-off tube (10) via a connection pipe (23), and a connection pipe ( And an on-off valve (24) provided in (23).

Insert the neck part (4) into the funnel part (14).
It has an annular receiving part (13) for receiving the base side of (5), and setting means (12) for setting the pipe assembly at a predetermined position.

The cooling device (19) is a tube assembly (1) set on the mounting body (14).
It is installed so as to surround the neck portion (4) of (1) and cool the neck portion (4).

The tip-off heater (21) is installed in the tube assembly (11) set in the mounting body (30) at a position facing the chip-off tube (10).

[Action]

In order to manufacture a cathode ray tube using the device of the present invention described above, first, an electron gun is placed at a predetermined position in the neck portion (4) of the funnel portion (5).
(3) is housed and placed, and the glass stem having the terminal pin is heat-welded and placed on the end of the neck (4).

In this way, the open end surface of the panel section (2) is abutted against the open end surface of the funnel section (5) having the neck section (4) in which the electron gun (3) is housed and arranged, and the tube assembly (11 ) Is configured.

The inner surface of the panel portion (2) is covered with a fluorescent surface, for example, a fluorescent surface coated with a metal coating on a color fluorescent coating, but is not yet subjected to baking treatment, that is, heat treatment. This panel section (2) and funnel section (5)
The frit material is applied to at least one of the opening end faces of the.

Each of the above-mentioned assemblies (11) is a mounting body (1
4) It is set by the setting means (12) at a predetermined position above.

The moving table (30) is inserted into, for example, a tunnel furnace in a state where the funnel portion (5) and the panel portion (2) of these assemblies (11) are not yet joined to each other. This tunnel furnace has a heating part in which each part is maintained in a predetermined temperature distribution, and the tube assembly is relatively passed through the tunnel furnace to perform a baking process on the fluorescent surface, a funnel part and a panel. Heat bonding of frit material between parts, that is, frit seal treatment is performed in the same heating step, and then exhaust treatment of the pipe body is performed,
The exhaust portion is sealed to increase the degree of vacuum inside the tube.

As described above, when the apparatus of the present invention is used, each heat treatment is performed in the same heating process without independently performing each heat treatment, so that the time required for each treatment time can be shortened. That is, it is possible to omit the time required to raise the temperature in each thermal process when each thermal process is performed individually. This heating time requires a long time because the larger the cathode ray tube has, the larger its heat capacity is.
What requires 20 hours of working time can be reduced to about 7 hours. Moreover, since a common heating furnace can be used as the heating furnace, the overall size of the apparatus can be reduced, the work area can be reduced, the number of work steps can be reduced, and the cost can be reduced accordingly.

When the device of the present invention is used, these are heated by the cooling device (19) while the neck portion (4), that is, the electron gun therein is cooled, so that the electron gun is damaged by the heating. Is avoided.

〔Example〕

As shown in Fig. 3, the neck of the funnel (5) is pre-set.
The electron gun (3) is housed in (4) and its stem (9) is sealed to the base of the neck (4) by fusion.

In this case, the funnel portion (5) is not yet joined to the panel portion (2), and therefore the funnel portion (5) and the electron gun (3) are located from the opening facing surface (5a) of the funnel portion (5). Since it can be performed with sufficient observation, it can be reliably set at a predetermined position.

In this case, the electron gun (5) is attached with a getter container containing a heat-resistant getter material, for example, a fritable getter (trade name, manufactured by SAES), which withstands a high temperature of 450 ° C. or higher in the heat treatment described later. The getter container (6) is arranged at a predetermined position of the funnel part (5) by accommodating and disposing the electron gun (3) in the neck part (4).

Then, in the device of the present invention, a tube assembly in which the electron gun (3) described above is set in a predetermined positional relationship of the panel portion (2) on the funnel portion (5) housed in the neck portion (4). Regarding (11), make it possible to perform the required heat treatment and exhaust.

In the present invention, a moving table (dolly) (30) is provided. FIG. 1 is a schematic line-shaped top view in the state in which the tube assembly (11) is held on the movable table (30), and FIG. 2 is a schematic line-side view thereof.

On the moving table (30), the neck portion (4) of the funnel portion (5) is inserted, and a mounting body (14) having an annular receiving portion (13) for receiving the base side of the funnel portion (5) is provided. A setting means (12) for setting the tube assembly (11), particularly the funnel portion (5) at a predetermined position, is provided on the mounting body (14). The setting means (12) is formed by arranging a plurality of arms. In this example, not only the funnel portion (5) but also the panel portion (1) is positioned by the setting means (12).
A first arm portion (15) bent in an L shape extending along two adjacent sides of (5), and second and third arm portions planted so as to face the other two sides, respectively. (16) and (17), each arm part (15), (16), (17) has a funnel part (5) and a panel part (2), respectively, at the time of forming each glass of each peripheral surface thereof. Has a positioning pin (18) which abuts against the abutting portion provided on the base, that is, a reference flat surface (not shown), and the funnel portion (5) is set on the virtual axis 0-0'by these pins (18). And this virtual axis 0-
It is set to a predetermined rotation angle position with respect to 0 ', and the panel portion (2) is placed on the opening end surface (5a) of the funnel portion (5) in a state where the opening end surface (2a) abuts against it. It can be positioned and held.

Then, around the neck portion (4) under the mounting body (13), a high frequency coil for high frequency heating the cooling device (19 and the electrodes of the electron gun (3))
(20) and are placed.

Further, a tip-off heater (21) is provided at a position corresponding to a predetermined portion of the tip-off tube (10) provided on the stem (9) therebelow.

At the tip of the tip-off tube (10) of the stem (9), attach a vacuum pump.
A pipe (23) connected to the air passage (26) is connected to the pipe (23). The pipe (23) is provided with an opening / closing valve (24) for introducing and blocking air, and an opening / closing valve (25) for opening and closing a connection path to the vacuum pump (22).

In such a configuration, the open end surface of the funnel (5)
(5a), or with the glass frit material applied to at least one of the opening end faces (2a) of the panel part (2), the funnel part (5) is predetermined by the position setting means (12) of the moving table (30). In this state, the panel portion (2) is also held by the position setting means (12) in this state, that is, the panel is formed on the opening end face (5a) of the funnel portion (5) via the glass frit material. Pipe assembly by abutting the open end face (2a) of the part (2)
It constitutes (11).

In this state, the open / close valve (24) is opened and the open / close valve (25) is closed to introduce outside air into the pipe assembly (11) through the tip-off pipe (10).

Then, in this state, the movable table (30) is introduced into a heating furnace, for example, a tunnel furnace.

In this way, heat treatment is applied to the fluorescent surface in the panel section (2), and the panel section (2) and the funnel section are baked.
Frit seal processing with (5) is performed.

In this case, a cooling device (1) is provided so that the electrode of the electron gun or the cathode material is not oxidized by the introduction of outside air, that is, air containing oxygen, into the tube and heating at high temperature.
Cool the electron gun (3) through cooling water in 9).

In this way, the firing process and the heat treatment of the glass frit seal are simultaneously performed. Then close the open / close valve (24).
(25) is opened and the inside of the pipe is evacuated by the vacuum pump (22). After that, the heater (21) is energized and the tip-off tube (1
The tube body is sealed by welding and sealing (0).

Such heat treatment can be performed by selecting the temperature distribution of each part in the tunnel furnace and moving the moving table (30) relatively into the tunnel furnace as described above.

FIG. 4 shows the temperature programming of the substantial heating provided, for example, by moving the carriage (30) relatively through the tunnel furnace.

In this case, the tube assembly (11) is heated at a rate of 5 to 10 ° C./minute from the heating start time t ₀ to a certain time t ₁ to perform the baking treatment of the fluorescent surface and the frit seal treatment. Temperature for example 45
Heating is performed to 0 ° C., and this is held for a predetermined time t _{1 to} t ₂ , during which the above-described firing process and frit sealing are performed. During these processing, the electron gun is cooled by the cooling device (19). Next, at time t ₂ , the temperature is lowered, the supply of cooling water to the cooling means (19) is stopped, and the on-off valve is opened.
(24) is closed, the on-off valve (25) is opened, and the vacuum pump (22) is used for exhaust processing. Then the high-frequency energization is performed by heating them through the dielectric current to each electrode of the electron gun (3) to the coil (20) at time t _3, burned deposits of the electron gun is subjected to so-called cancer baked process, or evaporation Then, the removal is performed for about 3 minutes, and thereafter, at time t ₄ , the tip-off by the heating means (21) of the tip-off tube (10), that is, air-tight sealing by welding is performed.

In this way, the fluorescent surface in the panel section (2) of the assembly (11) is baked and the frit seal processing of the panel section (2) and the funnel section (5) is performed, and the exhaust gas inside the tube is sealed. Then, the cathode ray tube body is manufactured.

After that, outside the pipe, although not shown, for example, a high-frequency heating coil placed in the vicinity of the getter container so as to face it causes an induction current to flow in the getter container (6) and resistance heating causes the temperature of the container to rise to 800 ° C to 900 ° C. As a result, the getter material is vaporized to adsorb the residual gas in the pipe body, thereby increasing the vacuum degree in the pipe body. In this way, the intended cathode ray tube held at a high degree of vacuum is manufactured.

The cathode ray tube thus obtained has a band around the front of the tube body, for example, in the vicinity of the joint between the panel portion (2) and the funnel portion (5) or in the periphery thereof, which is not shown in the drawings but has a band for preventing explosion proof. To do.

〔The invention's effect〕

As described above, according to the device of the present invention, since the tube assembly (11) can be supported and moved, it is possible to efficiently perform the firing treatment of the fluorescent surface and the frit seal. The heating process and the heating process for exhausting can be performed by heating once. Especially, in the device of the present invention, by providing the cooling device (19), the electrons in the neck part (4) are Since the gun is heated in a cooled state, the heating can perform the treatment without deteriorating the characteristics of the electrode and the cathode of the electron gun, and a highly reliable cathode ray tube can be manufactured.

Since each heating is performed once as described above, the time can be markedly shortened as compared with the conventional method in which each heating step is sequentially performed. In particular, a super large heat capacity is large. It can be applied to obtain a cathode ray tube to significantly reduce the time.

Further, as compared with the case where each heating work is performed in a separate heating furnace, it is possible to achieve simplification of the entire apparatus, simplification of the work area, simplification of the work, and the like. In addition, when each heating is performed sequentially, the pipe is repeatedly heated and cooled, that is, cracks due to heat and strain are likely to occur after several thermal cycles, and the risk of implosion accident is compared. In comparison with the relatively large one, in the process using the device of the present invention, the occurrence rate of such an implosion accident is drastically reduced by eliminating the repeated temperature increase and decrease temperature, and the occurrence rate of defective products is reduced. It is possible to significantly reduce the risk and to reduce the risk associated with the implosion accident, and the work for removing the glass fragments from the manufacturing work section.

[Brief description of drawings]

1 and 2 are schematic top views and side views of an example of the device of the present invention, and FIG. 3 is a side view of an example of a funnel part used for explaining an example of a method of manufacturing a cathode ray tube using the device of the present invention. 4, FIG. 4 is a temperature programming diagram, FIG. 5 is an exploded side view of a tube body for explaining a conventional method for manufacturing a cathode ray tube, and FIG. 6 is a side view of the cathode ray tube. (1) …… Fluorescent surface, (2) …… Panel section, (3) …… Electron gun, (4)
...... Neck part, (5) …… Funnel part, (20) …… Movable stand, (12) …… Setting means, (22) …… Exhaust pump.

Claims (1)

[Claims] 1. A cathode ray tube having at least a panel portion, a funnel portion joined to the panel portion, and a neck portion integrally formed with the funnel portion and having a tip tube at an end thereof. A cathode ray tube manufacturing apparatus for heating and exhausting in a process, wherein a moving table for introducing a tube assembly of the panel section and the funnel section having the neck section into a heating furnace, and a moving table arranged on the moving table. A mounting body on which the pipe assembly is mounted; a cooling device for the neck portion; a tip-off heater for heating and tip-offing the tip-off pipe; and a connection pipe connected to the tip-off pipe. A vacuum pump, and an opening / closing valve provided in the connection pipe, wherein the mounting body has an annular receiving portion that receives the neck portion and receives the base side of the funnel portion, and the pipe. Position the body assembly The cooling device is set to surround the neck portion of the pipe assembly set in the mounting body to cool the neck portion, A manufacturing apparatus of a cathode ray tube, wherein the heater is installed at a position facing the tip-off tube of the tube assembly set in the mounting body.