JP2003168364A - Dust removing method of cathode-ray tube and dust removing device for cathode-ray tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dust removing method and a dust removing device of a cathode-ray tube capable of surely exerting the effect of a dust removing process with a simple structure to resolve a conventional problem that although dust such as dust and foreign matter remaining in a sealed bulb composed by welding a face panel to a funnel is discharged outside the bulb together with dry air jetted from an air nozzle inserted into the bulb by applying impact and vibration to the bulb, dust stuck to the bulb surface by static charge can not be removed, thereby the dust still remains in the bulb and a cathode-ray tube characteristic is deteriorated by the remaining dust. <P>SOLUTION: Static charge of the sealed bulb 14 composed by welding the face panel 11 to the funnel 12 is eliminated by discharging static electricity charged on the inside and outside surfaces of the bulb 14 to the earth by using a static eliminating means 21 and 25, and dust is raised by applying impact and vibration to the bulb 14 by using a hammer 17 or an ultrasonic vibrator 18 and discharged outside the bulb 14 together with exhaust of the dry air jetted from the air nozzle 26 inserted into the bulb 14 and thus, a dust removing process is carried out. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing dust from a cathode ray tube and a dust remover for a cathode ray tube, and more particularly, to a face panel and a funnel which are welded together in a sealing furnace and then sealed with the face panel and the funnel. The present invention relates to a method for removing dust from a cathode ray tube and a dust remover for a cathode ray tube, in which the surface of the valve is grounded to discharge static electricity when performing dust removal processing on the inside of the mounted bulb.

[0002]

2. Description of the Related Art In general, a color cathode ray tube has a face panel and an envelope made of a funnel-shaped funnel, and a phosphor screen made of a three-color phosphor layer is provided on the inner surface of the face panel. A shadow mask attached to a mask frame is arranged inside the face panel so as to face the phosphor screen. As this phosphor screen, a phosphor screen composed of dot- or stripe-shaped three-color phosphor layers that emit blue, green, and red,
And a black matrix type or black stripe type fluorescent screen in which a black light absorbing layer is provided in the gap between the three-color phosphor layers.

On the other hand, an electron gun for emitting three electron beams is arranged in the cylindrical neck of the funnel.
Then, the three electron beams emitted from this electron gun are deflected by a deflection yoke mounted outside the funnel, selected by a shadow mask, and the phosphor screen is horizontally and vertically scanned to display a color image on the phosphor. It is configured for playback display on the screen.

Such a color cathode ray tube is manufactured through a manufacturing process as shown in FIG.

That is, taking a color cathode ray tube having a black stripe type phosphor screen as an example, a photosensitive agent is applied to the inner surface of the face panel to form a photosensitive film, and the photosensitive film is exposed through a shadow mask. (Fig. 4a),
By developing, a resist having a stripe pattern is formed at the phosphor layer forming position. Next, a black paint is applied to the inner surface of the face panel on which the resist is formed to form a black paint layer. Next, the special color paint layer on this resist is peeled off together with the resist to form a light absorbing layer. After that, a phosphor slurry containing a phosphor and a photosensitizer as a main component is applied to a gap between the light absorption layers to form a phosphor slurry layer,
This phosphor slurry layer is exposed through a shadow mask and developed to form a phosphor layer, and this is repeated for the three-color phosphor layer to form a phosphor screen (the same b). Aluminum is vapor-deposited on the phosphor screen thus formed to form a metal back (the same c).

On the other hand, on the funnel side, a black conductive paint which is connected to the anode button is applied to the inner surface of the funnel to form an internal conductive film (the same d), and the funnel is brought into contact with the face panel. Frit glass is applied to the surface (the same e), the funnel with the frit glass and the face panel are put together, and the frit glass is melted in a sealing furnace to put the face panel and the funnel through the frit glass. After welding and fixing, a sealed valve (envelope) is formed (same f), and the sealed valve is dedusted inside the valve in the next dedusting step (same g). Dust remaining on the valve is discharged to the outside of the valve.

In another process, the electron gun is assembled (the same h), and the assembled electron gun is mounted in the neck of the funnel of the valve that has been subjected to the dust removal process, and the electron gun is sealed in the valve. After stopping (same i), an evacuation process is performed to bring the inside of the sealed valve into a vacuum state (same j), and finally a color cathode ray tube is completed (same k). After that, a deflection yoke or the like is attached to the outer periphery of the funnel of the cathode ray tube.

The cathode ray tube is manufactured through the above manufacturing process. In the sealing process shown in FIG. 4f, the temperature of the valve reaches about 450 ° C. in the sealing furnace.
Therefore, the atmosphere in the valve is in a state of being expanded to the maximum. In addition, near the outlet of the sealing furnace, the temperature of the valve drops to about 150 ° C, but the temperature of the valve leaving the sealing furnace is still high at about 150 ° C. The atmosphere in the valve is kept expanded compared to the outside air. Since the temperature of the valve gradually decreases, the atmosphere in the valve also contracts accordingly. At the time of this contraction, the outside air outside the valve is sucked into the valve through the neck opening, and along with the suction of this outside air, dust such as floating dust and foreign matter in the outside air also enters the valve at the same time. You will inhale. This is because the atmosphere in the valve expands when the temperature is high, so that the temperature inside the valve is lowered to a temperature near room temperature and the inside of the valve becomes a vacuum state. For this reason, the outside air around the valve is sucked, and along with the sucked outside air, dust such as floating dust and foreign matter is also sucked into the valve.

This dust invasion occurs because the valve is at a temperature higher than room temperature for a while even when the valve passes through the maximum temperature region of the sealing furnace and is gradually cooled, and even when the valve is taken out of the sealing furnace. In addition, it tends to occur when sucking outside air during the cooling period of the valve. When this dust enters the bulb through the neck opening of the funnel, the dust that has entered causes defects such as a phosphor screen defect, a shadow mask clogging, deterioration of withstand voltage characteristics, and touch between electrodes.

For this reason, after the sealing step in the manufacturing process,
A dust removing process as shown in FIG. 4g is provided, and the dust removing process is performed using the dust removing device as shown in FIG.
In this dust removing device, the face panel 51 and the funnel 5 are
2 and the sealed valve 54 welded together via the frit glass 53, the face panel 51 is located on the upper side in the drawing,
The funnel 52 is mounted on a mount (not shown) so that the neck 55 opening 56 of the funnel 52 is located on the lower side. In this state, a plurality of hammers 57 are arranged above the face panel 51, and an ultrasonic vibrator 58 is arranged in the lateral direction of the face plate 51 of the valve 54. Further, an air nozzle 59 for ejecting dry air, which is indicated by a broken line in the figure, is inserted into the valve 54 from the opening 55 of the neck 55 of the funnel 52 to form a dust removing device.

The dedusting device constructed as described above is used to remove dust in the sealed valve 54, but a gentle impact is mainly applied to the face panel 51 surface by a hammer 57 that moves up and down from above the face panel 51. To blow out a relatively large amount of dust. In addition, ultrasonic waves are transmitted from an ultrasonic vibrator 58 arranged so as to face the skirt portion of the face panel 51, and the ultrasonic vibration vibrates the inside of the valve 54. Operates to lift dust. Dust remaining inside the valve 54 is released by the hammer 57 and the ultrasonic vibrator 58, and the air nozzle 5
The dust is discharged from the valve 54 together with the dry air through the opening 56 of the neck 55 by the dry air injected from the valve 9 into the valve 54 to remove unnecessary dust. Is to prevent them from remaining.

[0012]

Even if such a dust removal process is performed, the sealed valve 54 carried out from the sealing furnace still maintains a considerably high temperature as compared with room temperature. Due to the influence of the temperature of the sealing furnace, the dust removal process is generally performed in a dry environmental atmosphere with a humidity of 50% or less. Static electricity is likely to be generated in the valve 54 under the conditions of such a dry environment atmosphere, and when static electricity is charged on the outer surface of the valve 54,
The inner surface of the valve 54 will also be charged, and dust removal processing will be performed in the state of the valve 54 charged with static electricity.

For this reason, even if the electrostatically charged valve 54 is subjected to a dedusting process by using a dedusting device, the fine dust is adsorbed on the inner surface of the valve 54 by the static electricity, and the impact by the hammer 57 and ultrasonic waves are generated. Even if vibration is applied from the vibrator 58 and dry air is sprayed into the valve 54 using the air nozzle 59, the dust that has been adsorbed in the valve 54 by static electricity is discharged to the outside of the valve 54 together with the dry air. Therefore, the dust remaining in the bulb 54 causes a serious problem in the product characteristics of the finished product of the color cathode ray tube.

The present invention has been made to cope with such a problem, and in a simple method, the dust is reliably discharged from the sealed valve to the outside so that the dust remains in the valve. An object of the present invention is to provide a method for removing dust from a cathode ray tube and a dust remover for a cathode ray tube that can prevent the dust.

[0015]

DISCLOSURE OF THE INVENTION The present invention provides a method for removing dust from a cathode-ray tube in which a face panel and a funnel are sealed together to remove dust in a sealed valve. In addition to the static elimination process, the valve is shocked or vibrated to release the dust in the valve, and the dust is discharged simultaneously with the discharge of the air injected from the air nozzle into the valve.

Further, in a cathode ray tube dedusting device for dedusting dust in a sealed valve in which a face panel and a funnel are sealed, a hammer for impacting the valve and a minute vibration are applied to the valve. A static eliminator having at least one of an ultrasonic vibrator for discharging the static electricity charged in the valve by grounding the valve, and for injecting air into the valve through the neck opening of the valve. And an air nozzle.

According to the dust removing method and the dust removing apparatus, even if a sealed valve in which static electricity is charged is applied, it is possible to reliably discharge the dust inside the valve to the outside of the valve. It is possible to prevent the deterioration of the characteristics of the cathode ray tube due to the above.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method for removing dust from a cathode ray tube according to the present invention will be described according to a method for manufacturing a cathode ray tube.
As shown in FIG. 1, a photosensitive agent is applied to the inner surface of the face panel to form a photosensitive film, and the photosensitive film is exposed through a shadow mask (FIG. 1a) and developed to form stripes at the phosphor layer forming position. Forming a resist having a pattern. Next, a black paint is applied to the inner surface of the face panel on which the resist is formed to form a black paint layer. Next, the special color paint layer on this resist is peeled off together with the resist to form a light absorbing layer. After that, a phosphor slurry containing a phosphor and a photosensitizer as a main component is applied to a gap between the light absorbing layers to form a phosphor slurry layer, and the phosphor slurry layer is exposed through a shadow mask and developed. The phosphor layer is used, and this is 3
A phosphor screen is formed by repeating the procedure for the color phosphor layer (the same b). Aluminum is vapor-deposited on the phosphor screen thus formed to form a metal back (the same c).

On the other hand, on the funnel side, an inner conductive film is formed by applying a black conductive paint which is connected to the anode button to the inner surface of the funnel (the same d), and further the contact surface of the funnel with the face panel. Frit glass is applied to the same (the same as e), the funnel with the frit glass and the face panel are attached, and the frit glass is melted in a sealing furnace to weld the face panel and the funnel through the frit glass. After fixing, a sealed valve (enclosure) is formed (same f), and the sealed valve is dedusted in the next process. A treatment is performed (the same g), and the dust remaining in the valve is discharged to the outside of the valve. In this dedusting process, the valve is connected to the ground to eliminate static electricity that has been charged, and the impact from a hammer and the vibration from an ultrasonic vibrator are applied to the sealed valve to release the dust and remove it. The dust is removed by discharging it together with the air.

In another step, the electron gun is assembled (the same h), and the assembled electron gun is mounted in the neck of the funnel of the valve which has been subjected to the dust removal treatment, and the electron gun is sealed in the valve. After stopping (same i), an exhaust process is performed to bring the inside of the sealed valve into a vacuum state (same j), and a color cathode ray tube is obtained (same k). A deflection yoke etc. is attached.

In this dust removing process, a dust removing process is performed by using a dust removing device as shown in FIG.

That is, the face panel 11 and the funnel 1
2 and the sealed valve 14 welded via the frit glass 13, the face panel 11 is located on the upper side in the figure,
The funnel 12 is mounted on a pedestal (not shown) so that the neck 15 opening 16 of the funnel 12 is located on the lower side. In this state, a plurality of hammers 17 are arranged above the face panel 11, and an ultrasonic vibrator 18 is arranged in the lateral direction of the face panel 11 of the valve 14. Further, an anode button 19 connected to an internal conductive film (not shown) provided on the funnel 11 is brought into contact with a conductor 20 made of a conductive wire connected to the ground, or a color television receiver is generally used. An anode button 19 is used by using a first charge eliminating means 21 formed of a conductor 20 formed by diverting an anode cap used in a terminal display and grounding a conductor of the anode cap. By grounding, and consequently grounding the conductive film inside the bulb 14 connected to the anode button 19, the static electricity charged on the inner surface of the bulb 14 is eliminated. Further, on the outer surface of the bulb 14, a plurality of conductors 22 are bundled at one end to form a broom or a brush, and the other end is composed of a conductor 24 made of a conductive brush grounded via a conductor 23. A wide range of the outer surface of the valve 14 is wiped by using the static eliminating means 25 to eliminate static electricity charged on the outer surface of the valve 14. These first
And the second charge eliminating means 21, 25 are both means 21, 2.
Although it is best to use 5 together, it is possible to use at least one of them to remove the static electricity because the static elimination effect is superior to that of the conventional dust removing device. Further, the neck 15 opening 16 of the funnel 12
From the above, an air nozzle 26 for ejecting dry air shown by a broken line in the figure is inserted into the valve 14 to form a dust removing device.

The dust removal processing is performed in the sealed valve 14 by using the dust removal device thus constructed.
The static electricity charged on the inner and outer surfaces is discharged by discharging the static electricity to the ground using the first and second discharging means 21 and 25. When the static elimination is performed in this manner, the dust adsorbed by the static electricity on the valve 14 becomes a free state and is easily removed. After the static elimination, or while the static elimination is being performed, the hammer 17 which moves up and down mainly from above the face panel 11 gives a gentle impact to the face panel 11 surface to eject relatively large dust. Further, ultrasonic waves are transmitted from the ultrasonic vibrator 18 arranged so as to face the skirt portion of the face panel 11, and the ultrasonic vibration vibrates the inside of the valve 14. Actuate to lift.
Dust remaining inside the valve 14 is released by the first and second charge eliminating means 21 and 25, the hammer 17, and the ultrasonic vibrator 18, and the air is discharged from the air nozzle 26 into the valve 14. Dust is discharged from the valve 14 together with the dry air through the opening 16 of the neck 15 by the dry air to remove dust so that unnecessary dust does not remain in the valve 14. Is.

Therefore, the dust adhering to the valve 14 due to the static electricity loses its adhering force by discharging the charged electric charge by the first and second charge eliminating means 21 and 25, and further, the impact by the hammer 17 and the superposition Sound wave vibrator 1
Dust is lifted by applying vibration by 8, and by injecting dry air from the air nozzle 26,
It is possible to discharge the dust together with the dry air from the opening 16 of the neck 15 to the outside of the valve 14 so that unnecessary dust is not left inside the valve 14.

The second static eliminating means 25 used in this dust removing apparatus is not limited to the configuration described in this embodiment, but may be constructed as shown in FIG. 3, for example. It is possible. That is, a conductive plate formed of a metal having a relatively soft elastic force, having a large number of comb-teeth shaped sliding pieces 27 formed at one end and a holding portion 29 holding the grounded conductor wire 23 at the other end. 30 to this lead wire 23
It is also possible to use a conductor 24 configuration in which it is soldered and fixed to one end of the. In the case of this configuration, not only the static elimination means 25 can be easily formed by press molding or the like, but also a wide range of valves 1
It is possible to bring the outer surface portions into contact with each other at once.

It is needless to say that the present invention is not limited to the above-mentioned embodiment, but can be applied and modified in various ways.

[0027]

As described above, according to the present invention,
It is possible to reliably prevent dust from adhering to the valve due to electrostatic charging, and at the same time, to remove dust due to shock or vibration so that air can be ejected to the outside of the valve at the same time. As a result, the dust removal process can be promoted more reliably, and therefore, the cathode ray tube dust removing method and the cathode ray tube dust removing apparatus capable of improving the characteristics of the cathode ray tube can be obtained.

[Brief description of drawings]

FIG. 1 is a process explanatory view of a cathode ray tube for explaining a method for removing dust from a cathode ray tube according to the present invention.

FIG. 2 is an explanatory view for explaining a dust removing method and a dust removing apparatus of the cathode ray tube.

FIG. 3 is a plan view showing another configuration of the static eliminator which also constitutes the dust remover.

FIG. 4 is a process explanatory view of a cathode ray tube for explaining a conventional method for removing dust from a cathode ray tube.

FIG. 5 is an explanatory view for explaining a dust removing method and a dust removing device of the cathode ray tube.

[Explanation of symbols]

11: Face panel 12: Funnel 14: Valve 19: Anode button 20: Conductor 21: First static eliminating means 24: Conductor 25: Second static elimination means 26: Air nozzle

Claims (9)

[Claims] 1. A method of removing dust from a cathode ray tube, wherein dust in a sealed valve, in which a face panel and a funnel are sealed together, is removed, and static electricity charged on the surface of the valve is removed, and the valve is removed. A method for removing dust from a cathode ray tube, characterized in that the dust in the bulb is released by applying shock or vibration to the dust, and the dust is discharged simultaneously with the discharge of the air jetted into the bulb from the air nozzle. 2. The method for dedusting a cathode ray tube according to claim 1, wherein the static elimination process is grounded via an anode button provided on the bulb. 3. The static elimination process is performed by bringing a conductor into contact with the outer surface of the valve to ground it.
Dust removal method for the described cathode ray tube 4. The method for removing dust from a cathode ray tube according to claim 1, wherein in the neutralization process, a conductor is brought into contact with the anode button provided on the bulb and the outer surface of the bulb to ground the conductor. 5. The method for removing dust from a cathode ray tube according to claim 1, wherein the bulb is subjected to static elimination processing, and then the bulb is shocked or vibrated to release the dust. 6. A cathode ray tube dedusting device for dedusting dust inside a sealed valve, wherein a face panel and a funnel are sealed together, wherein a hammer for impacting the valve and a fine dust for the valve. A static eliminator having at least one of an ultrasonic vibrator that gives vibration, and a static eliminator for grounding the valve to eliminate static electricity charged in the valve, and an air inserted into the valve through the neck opening of the valve. A dust remover for a cathode ray tube, comprising an air nozzle for injecting. 7. The dust remover for a cathode ray tube according to claim 6, wherein said charge eliminating means is composed of a conductor connected between an anode button provided on said bulb and ground. 8. The dust remover for a cathode ray tube according to claim 6, wherein the charge eliminating means is constituted by a grounded conductor that is in contact with the outer surface of the bulb. 9. The static eliminator is a first static eliminator composed of a conductor connected between an anode button provided on the valve and a ground, and is grounded to be in contact with the outer surface of the valve. The dedusting device for a cathode ray tube according to claim 6, characterized in that the dedusting device comprises a second static eliminator composed of a conductor.