JP2002025442A - Manufacturing method of cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-weight and highly reliable cathode-ray tube. SOLUTION: The manufacturing method of a cathode-ray tube comprises a process, in which a cathode-ray tube glass bulb 1, that is installed with an electron gun 10 at the neck 13, is housed in the vacuum chamber 2, a process in which the insides of the vacuum chamber 12 and the cathode-ray tube glass bulb 1 are evacuated until they reach the pressure of the first pressure, a process in which the inside of the cathode-ray tube glass bulb 1 is heated evacuated, until it reaches the pressure of the second pressure which is lower than the first pressure, a process in which an inert gas is made to flow into the cathode- ray tube glass bulb 1 and the inside is returned to the atmospheric pressure as well as the inside of the vacuum chamber, which is also returned to the atmospheric pressure, and a process in which the cathode-ray tube glass bulb 1 is installed with a resin material and strengthened, after it has reached the atmospheric pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a cathode ray tube using a composite material composed of glass and a resin material.

[0002]

2. Description of the Related Art Since a cathode ray tube is evacuated while the inside of the cathode ray tube is evacuated and decompressed while being transferred to a continuous furnace capable of raising the temperature to about 300 ° C., the cathode ray tube introduced into the evacuation step has a vacuum holding property. And heat resistance of about 300 ° C. are required.

Here, the purpose of raising the temperature to about 300 ° C. is to remove the components of the residual gas adsorbed inside the cathode ray tube and to obtain a degree of vacuum necessary for functioning as a cathode ray tube. .

[0004] In a cathode ray tube, a glass material is generally used in order to obtain both of such characteristics of vacuum retention and heat resistance.

[0005]

However, in a cathode ray tube using a glass material, it is necessary to guarantee a vacuum resistance before the evacuation step, so that it is necessary to increase the thickness of the glass to a certain extent. The problem of increasing the weight of the tube arises.

Therefore, from the viewpoint of reducing the weight, it is conceivable to use a composite material in which plastics is bonded to glass, for example, in order to reduce the thickness of the glass and secure vacuum resistance. However, plastics having low heat resistance cannot be used, and there are many practical problems.

For this reason, it is conceivable that the temperature in the exhaust process of the cathode ray tube is set to be equal to or lower than the allowable temperature of the plastics. And the original performance of the cathode ray tube cannot be exhibited.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve such problems. That is, the method for manufacturing a cathode ray tube according to the present invention comprises the steps of: accommodating a cathode ray tube glass bulb having an electron gun attached to a neck portion in an exhaust chamber; and holding the exhaust chamber and the cathode ray tube glass bulb up to a first pressure. Exhausting, heating the interior of the glass bulb for a cathode ray tube while evacuating the interior to a second pressure lower than the first pressure, and introducing an inert gas into the glass bulb for a cathode ray tube to make the interior equal to the atmospheric pressure. And returning the exhaust chamber to atmospheric pressure,
A step of attaching a resin material to the glass bulb for a cathode ray tube and reinforcing the glass bulb for a cathode ray tube when the pressure has returned to the atmospheric pressure.

According to the present invention, the pressure difference between the inside of the glass tube for the cathode ray tube and the inside of the exhaust chamber outside the glass bulb for the cathode ray tube can be reduced in the evacuation process, and the vacuum resistance of the glass bulb for the cathode ray tube can be set low. In addition, an inert gas is introduced into the glass tube for the cathode ray tube, and the inside is returned to a pressure equal to the atmospheric pressure, and the inside of the exhaust chamber is also returned to the atmospheric pressure. In this state, a resin material is attached to the glass bulb for the cathode ray tube for reinforcement. Thereby, the resin material can be reinforced with a small pressure difference between the inside and the outside of the glass bulb for a cathode ray tube. At this time, an inert gas flows into the glass tube for the cathode ray tube, so that unnecessary substances are not left inside. In addition, since the heat treatment is performed when reinforcing with a resin material, the heat resistance of the resin material is reduced. You do not need to consider sex.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram (part 1) for explaining a method of manufacturing a cathode ray tube according to the present embodiment, and FIG.
FIG. 3 is a schematic diagram (part 2) illustrating a method for manufacturing a cathode ray tube according to the present embodiment, FIG. 3 is an overall configuration diagram of an exhaust furnace body, and FIG.
FIG. 3 is a schematic diagram illustrating an exhaust cart.

First, the configuration of the entire exhaust furnace and the exhaust cart applied to this embodiment will be described. That is, in the method of manufacturing a cathode ray tube according to the present embodiment, the glass bulb for the cathode ray tube is housed in the exhaust chamber 2 of the exhaust cart 100 shown in FIG. 4 and sequentially sent to the exhaust furnace body 200 shown in FIG. This is to advance the evacuation process in manufacturing.

The exhaust furnace body 200 has an inlet 201 for charging the exhaust cart 100, a heating zone 202 for heating, a soaking zone 203 for maintaining the heating temperature, a cooling zone 204 for returning the temperature to room temperature, and an exhaust port for taking out the exhaust cart 100. And an exit 205. Such an exhaust furnace body 200
As the exhaust cart 100 progresses sequentially in the interior, the exhaust process for the glass bulb for the cathode ray tube proceeds in order.

As shown in FIG. 4, the exhaust cart 100 is
Exhaust chamber 2 containing glass bulb 1 for cathode ray tube
And an exhaust chamber 2 and a glass bulb 1 for a cathode ray tube.
A rotary pump P1 for roughly evacuating the inside, a diffusion pump P2 for completely evacuating the inside of the glass tube 1 for a cathode ray tube, and an inert gas introduction pipe L are provided. Further, a roller R is attached to a lower portion of the exhaust cart 100 so that the exhaust cart 100 can travel inside the exhaust furnace body 200 shown in FIG.

Here, the pipe of the rotary pump P1 is connected to the exhaust chamber 2 and the diffusion pump P2. By operating the rotary pump P1, the inside of the exhaust chamber 2 and the inside of the glass bulb 1 for the cathode ray tube are roughly exhausted.

A heater (not shown) for electrically sealing the glass bulb 1 for the cathode ray tube is also provided between the exhaust chamber 2 and the diffusion pump P2.

Next, the flow of an exhaust process using such an exhaust cart will be described with reference to FIGS. First, as shown in FIG. 1A, an electron gun 10 is attached to a neck portion 13 of a glass tube 1 for a cathode ray tube, which is composed of a panel portion 11, a funnel portion 12, and a neck portion 13, and sealed.

Next, as shown in FIG. 1B, the cathode ray tube glass bulb 1 to which the electron gun 10 is attached is housed in the exhaust chamber 2 of the exhaust cart, and the lid 21 is closed. Then, the rotary pump P1 (see FIG. 4) is operated to operate the inside of the exhaust chamber 2 and the glass bulb 1 for the cathode ray tube.
The inside is roughly evacuated to about 10 ^-2 torr, and the inside of the cathode ray tube glass bulb 1 is further evacuated to about 10 ^-6 torr by operating the diffusion pump P2 (see FIG. 4).

In this state, the exhaust cart is passed through the heating zone 202 of the exhaust furnace 200 shown in FIG. 3 to bake the glass tube 1 for a cathode ray tube, thereby increasing the degree of vacuum. At this time, the inside of the glass tube 1 for a cathode ray tube is 10 ^-6 to
Although the pressure is reduced to about rr, the inside of the exhaust chamber 2 outside the pressure is reduced to about 10 ^-2 torr.
The stress applied to the glass bulb 1 for a cathode ray tube can be reduced. In other words, this makes it possible to lower the vacuum strength to be guaranteed and to use the thin glass tube 1 for a cathode ray tube.

When the exhaust cart passes from the heating zone 202 of the exhaust furnace body 200 shown in FIG. 3 through the soaking zone 203 and the cooling zone 204 and reaches the outlet 205, the exhaust process is completed.

Thereafter, as shown in FIG. 1 (c), air flows into the exhaust chamber 2 to return to atmospheric pressure, and at the same time, high-purity nitrogen (N ₂ ) or the like is formed in the glass tube 1 for a cathode ray tube. Inert gas is introduced to bring the pressure to the same as the atmospheric pressure.
At this time, the inert gas is sent into the glass bulb 1 for a cathode ray tube from the inert gas introduction pipe L (see FIG. 4) of the exhaust cart 100 shown in FIG. Here, the reason why the inert gas flows into the glass bulb 1 for the cathode ray tube is to prevent unnecessary substances from remaining in the reaction in the glass bulb 1 for the cathode ray tube.

Next, as shown in FIG. 2A, the lid 21 of the exhaust chamber 2 is opened. Even if the lid 21 is opened, the inside of the exhaust chamber 2 is returned to the atmospheric pressure in the previous step, and the inert gas flows into the glass bulb 1 for the cathode ray tube to make it equal to the atmospheric pressure. No pressure load is applied to the glass bulb 1 for a cathode ray tube.

Then, in this state, the reinforcing member 3 made of a resin material such as plastics is put on the panel portion 11 of the glass bulb 1 for a cathode ray tube, and is fixed with an adhesive.

Then, as shown in FIG. 2B, the lid 21 of the exhaust chamber 2 is closed, and the inert gas in the glass tube 1 for the cathode ray tube is exhausted to a desired degree of vacuum. For example, after the inside of the cathode ray tube glass bulb 1 reaches 10 ^-6 torr, the cathode ray tube glass bulb 1 is sealed with a heater.

After the sealing is completed, as shown in FIG. 2C, the glass bulb 1 for a cathode ray tube to which the reinforcing member 3 is attached is taken out from the exhaust chamber 2. At this time, the inside of the glass bulb 1 for a cathode ray tube becomes atmospheric pressure at a degree of vacuum of 10 ^-6 torr, but the reinforcing member 3 such as plastics is used.
, Sufficient vacuum resistance can be obtained.

FIG. 5 is a schematic diagram illustrating a glass bulb for a cathode ray tube manufactured according to the present embodiment. That is, in the glass bulb 1 for a cathode ray tube, the panel portion 11 and the funnel portion 12 are made thinner and lighter. Even if the thickness is reduced in this way, as described above, in the evacuation process, the pressure difference between the inside and the outside of the glass tube for a cathode ray tube 1 is reduced to ensure the vacuum strength, and the plastics is removed before the pressure difference occurs. Reinforcement by such a reinforcing member 3 makes it possible to reduce the weight while maintaining the vacuum holding property and the vacuum strength.

Further, since the thickness of the glass bulb 1 for a cathode ray tube can be reduced in this manner, the area of the frit seal portion between the panel portion 11 and the funnel portion 12 can be reduced, and particularly when a large cathode ray tube is manufactured. The temperature rise and temperature fall conditions in the frit sealing step can be eased, and breakage of the glass bulb 1 for the cathode ray tube due to a difference in temperature between inside and outside can be avoided.

The reinforcing member 3 made of plastics or the like
May be attached to one or both of the panel section 11 and the funnel section 12. Also,
It may be attached only to a part such as the front surface of the panel unit 11.
As plastics used as the reinforcing member 3, optical plastics such as polycarbonate and acrylic resin are preferable.

FIG. 6 is a schematic diagram for explaining another example of an exhaust cart. The exhaust cart 100 is characterized in that a heat conducting member 30 such as ceramics is provided between the cathode ray tube glass bulb 1 in the exhaust chamber 2 that houses the cathode ray tube glass bulb 1 and the inner wall of the exhaust chamber 2.

That is, in the exhausting process of the glass tube 1 for the cathode ray tube, the exhausting, heating and cooling are performed by passing the exhausting cart 100 through the exhaust furnace body 200 (see FIG. 2). In this case, the air in the exhaust furnace body 200 is used as a heat medium, and heat is transmitted to the glass tube 1 for a cathode ray tube by heat conduction and convection.

However, although there is air between the exhaust furnace body 200 and the exhaust chamber 2 of the exhaust cart 100, heat conduction and convection by air are cut off because the exhaust chamber 2 is in a vacuum atmosphere. Would.

Therefore, as shown in an exhaust cart 100 shown in FIG. 6, a heat conducting member 3 made of ceramics or the like is provided between the inner wall of the exhaust chamber 2 and the glass bulb 1 for a cathode ray tube to be housed.
0, heat from the outside is generated by the heat conducting member 3.
Thus, the temperature is transmitted to the glass bulb 1 for a cathode ray tube through 0, and the temperature can be raised and lowered efficiently.

The heat conducting member 30 is mainly made of ceramics, but its material, thickness, etc. are set so as to satisfy the temperature rising and falling rates according to the thickness of the glass tube 1 for a cathode ray tube. Further, it is desirable that the glass bulb 1 for a cathode ray tube does not react even if touched to the glass bulb 1 for a cathode ray tube, a frit, does not damage the glass bulb 1 for a cathode ray tube, and a thermal expansion can be avoided.

[0033]

As described above, the present invention has the following effects. That is, in the evacuation process, the pressure difference between the inside of the glass tube for a cathode ray tube and the inside of an exhaust chamber outside the glass tube can be reduced, and a thin glass tube for a cathode ray tube can be used. Also, after leaving the exhaust furnace, plastics etc. will be reinforced,
It is not necessary to consider the heat resistance of plastics, and baking of the glass bulb for a cathode ray tube can be performed under normal heating conditions. This makes it possible to manufacture a lightweight and highly reliable cathode ray tube.

[Brief description of the drawings]

FIG. 1 is a schematic diagram (part 1) illustrating a method for manufacturing a cathode ray tube according to the present embodiment.

FIG. 2 is a schematic diagram (part 2) illustrating the method for manufacturing the cathode ray tube according to the embodiment.

FIG. 3 is an overall configuration diagram of an exhaust furnace body.

FIG. 4 is a schematic diagram illustrating an exhaust cart.

FIG. 5 is a schematic diagram illustrating a glass bulb for a cathode ray tube manufactured according to the present embodiment.

FIG. 6 is a schematic diagram illustrating another example of an exhaust cart.

[Explanation of symbols]

1. Glass bulb for cathode ray tube 2. Exhaust chamber 3.
Reinforcing member, 10: electron gun, 11: panel, 12: funnel, 13: neck, 100: exhaust cart, 20
0: exhaust furnace, P1: rotary pump, P2: diffusion pump

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Fumiaki Hisamatsu 6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo Sony Corporation F-term (reference) 5C012 AA02 BB01 PP03 PP08 5C032 AA02 CC06 CD04

Claims (3)

[Claims] A step of housing a glass tube for a cathode ray tube having an electron gun attached to a neck portion in an exhaust chamber; and a step of exhausting the inside of the exhaust chamber and the inside of the glass bulb for the cathode ray tube to a first pressure. Heating the inside of the glass tube for a cathode ray tube while evacuating to a second pressure lower than the first pressure; and flowing an inert gas into the glass bulb for a cathode ray tube to return the inside to a pressure equal to the atmospheric pressure. A process for returning the inside of the exhaust chamber to the atmospheric pressure, and a process of attaching a resin material to the glass bulb for the cathode ray tube and reinforcing the glass bulb for the cathode ray tube when the pressure returns to the atmospheric pressure. 2. The method according to claim 1, wherein the resin material is attached to at least a surface of a panel portion of the glass bulb for a cathode ray tube. 3. A heat conductive material is disposed in a gap between an inner wall of the exhaust chamber and the glass bulb for a cathode ray tube while the glass bulb for a cathode ray tube is housed in the exhaust chamber. 2. The method for manufacturing a cathode ray tube according to 1.