JP2002216631A - Method and equipment for tube-inside cleaning of cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and equipment for tube-inside cleaning of a cathode-ray tube which is capable of removing tube-inside foreign matters efficiently by exhausting air from the inside of a cathode-ray tube under charging the tube electrically. SOLUTION: This processes are as follows: an air exhaust pipe 32 is inserted into a cathode-ray tube through a neck portion 12a; the tube-inside foreign matters are electrically charged by applying a prescribed voltage between the exhaust pipe and the anode bottom 44 of the cathode-ray tube; the tube inside becomes clean by sucking the foreign matters into or by attracting on the exhaust pipe by means of exhausting the air of the tube inside through the air exhaust pipe. Here, the effects of sucking the foreign matters in and attracting them on the exhaust pipe used for charging are increased by charging them. The foreign matters attached on an inside surface and the like are removed easily if the cathode-ray tube is vibrated while the air is exhausted, as a result the dust collection effect on the tube inside is more increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for cleaning a cathode ray tube. In detail, the inside of the cathode ray tube is cleaned by suctioning and attaching foreign matters floating in the cathode ray tube with an air suction tube in a state where the foreign matter attached to the inside of the cathode ray tube is charged. is there.

[0002]

2. Description of the Related Art Among various manufacturing processes of a cathode ray tube, there is a cleaning operation for removing foreign substances remaining in the tube of the cathode ray tube after welding a panel constituting the cathode ray tube and a funnel with a frit seal. This foreign matter removal operation is usually performed using an in-pipe cleaning device 20 as shown in FIG. This foreign matter removing operation will be described with reference to FIG.

First, as shown in FIG. 3, a cathode ray tube (CR)
T) 10 is composed of a panel 12 and a funnel 14,
Both are fused and fixed by the frit seal. As is well known, R, G, and B phosphors 16 are provided on the inner surface of the panel 12.
In this example, an aperture grill (AG) 18 which functions as a color selection mechanism is fixed to the inner surface of the panel 12.

In the process of applying a fluorescent substance to the inner surface of the panel 12 and the process of attaching the aperture grill 18, there is a cleaning process. Therefore, the inner surface of the panel 12 and the inner surface of the funnel 14 are cleaned using a cleaning liquid or air. Washing and cleaning are performed, but the cathode ray tube 10
Foreign matter 19 such as dust and residues from the previous process remains on the inner surface of the substrate. Therefore, as a pre-process for sealing the electron gun into the neck of the funnel 14, a cleaning operation for removing foreign matter in the tube is performed.

In the cleaning operation for removing foreign matter, the cathode ray tube 10 is often mechanically hit from the outside, and then air is blown into the tube to remove it. for that reason,
As shown in FIG. 3, in this conventional example, a front surface 12 of a panel 12 is formed.
a is provided with one or several hitting machines 22, in this example one hitting machine 22A, and two to four hitting machines on the panel side (skirt portion) 12b, two on the left and right sides in this example. Of the hitting machines 22B and 22C are provided.

Then, the panel surface is hit with pads 24A to 24C provided on these hitting machines 22A to 22C.
Since the cathode ray tube 10 vibrates by being hit, the foreign matter 19 attached to the inner surface of the tube floats in the tube. After a predetermined number of beatings, air is introduced into the pipe from the neck side and blown. By this spraying, foreign matters floating in the pipe are discharged out of the pipe, and the inside of the pipe is cleaned. When the foreign matter discharge processing is completed, the work of enclosing the electron gun, which is the final step, is started.

[0007]

By the way, the panel 12
When the and the funnel 14 are fixed by a frit seal, a surface treatment film 27 having an anti-reflection function for external light is often formed on the front surface 12a of the panel 12, so that the above-described foreign matter removal operation is performed. When the front surface 12a is hit by the above, the surface treatment film 27 may be peeled off. This seems to be due to the large hitting power.
The reason why the tapping force is increased is that foreign matters charged in the tube may adhere to the inner surface of the cathode ray tube 10. By the way, conventionally, the cathode ray tube 10 has a hitting force of 4 to 5 G.
, Which results in defective products. According to an experiment, it was confirmed that film peeling occurred at about 3%.

Further, the panel 12 is struck with the above-described tapping force.
When the skirt portion 12b side is hit, the vibration between the mounting pin 17 provided on the inner surface of the panel skirt portion 12b and the aperture grill 18 causes the mounting pin 1
7 may be damaged, or dust may be generated due to the mounting pin 17 being scraped.

The present invention has been made to solve such a conventional problem. In particular, the present invention solves the above problem by floating air in a pipe or charging foreign matter adhering to an inner wall surface of a pipe from an air suction pipe to air inside the pipe. The present invention proposes a method for cleaning the inside of a cathode ray tube in which a charged foreign substance is sucked and adsorbed to the air suction tube by sucking the air to enhance the dust collecting effect.

[0010]

In order to solve the above-mentioned problems, in the method for cleaning the inside of a cathode ray tube according to the present invention, an air suction tube is inserted from the neck portion side of the cathode ray tube. A predetermined voltage is applied between the air suction tube and the anode terminal of the cathode ray tube to charge foreign matters floating in the tube of the cathode ray tube, and to suck air in the cathode ray tube by the air suction tube. By that
The foreign matter is suctioned and adhered to the air suction tube to clean the inside of the cathode ray tube.

According to a sixth aspect of the present invention, there is provided an apparatus for cleaning the inside of a cathode ray tube according to the present invention, wherein an air suction tube inserted from a neck portion side of the cathode ray tube and an anode terminal of the air suction tube and an anode terminal of the cathode ray tube. Connected to the high-voltage generating means for applying a predetermined voltage, and an air pump connected to the air suction pipe, while charging foreign matter floating in the tube of the cathode ray tube, in the cathode ray tube tube The air is sucked by the air suction tube, whereby the foreign matter is sucked and adhered to the air suction tube to clean the inside of the cathode ray tube.

According to the present invention, foreign substances (including foreign substances adhering to the inner wall surface of the tube) floating in the tube of the cathode ray tube are charged. Then, by suctioning the air in the tube from the air suction tube used as one electrode for charging, foreign matter is sucked and adsorbed to the air suction tube. At this time, if the cathode ray tube is vibrated, foreign matters adhering to the inner wall surface of the tube and the like can be easily floated, so that the dust collecting effect in the tube is further enhanced.

When the cathode ray tube is hit, the hit is performed from the panel skirt portion side as much as possible. As a result, it is possible to improve peeling and surface flaws of the surface treatment film adhered to the panel tube surface,
The occurrence rate of defective products can be greatly reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a method and apparatus for cleaning a cathode ray tube according to the present invention will be described in detail with reference to the drawings. A cathode ray tube using an aperture grill as a color selection mechanism is exemplified.

FIG. 1 is an embodiment showing an example of the configuration of an in-tube cleaning apparatus 30 for a cathode ray tube according to the present invention, and FIG. 2 is a side view thereof. In this embodiment, the foreign matter is sucked and adsorbed while the charging (magnetization) and the tapping are used together.
The configuration for that will be described. The cathode ray tube 10 includes the panel 12 and the funnel 14 as described above.

The in-pipe cleaning device 30 includes an air suction pipe 32,
Air suction pump 40 and high voltage generator 46
It consists of. The air suction tube 32 is used by being inserted from the neck portion side. The air suction tube 32 is a metal tube used as one electrode of the high voltage generating means 46, and is inserted into the cathode ray tube. Is covered with an insulating film 34. This is for safety measures (electric shock, electric leakage, etc.) when the inner wall surface of the tube and the air blowing tube 32 come into contact as described later.

An air pump 40 is attached to one end of the air suction pipe 32 via an insulating member 36 via a connecting pipe 38 so that air inside the pipe can be exhausted from an external pipe 42.

The air suction pipe 32 and the funnel 1
A high voltage generating means (high voltage generating power supply circuit) 46 is provided between the anode terminal 44 provided in the power supply 4 and the anode terminal 44.
A high voltage of about 5 to 30 kV is applied as the high voltage, though it varies depending on the size of the cathode ray tube 10 to be cleaned.

In this embodiment, as shown in FIGS. 1 and 2, a pair of skirts 12b of the panel 12 are spaced apart from each other by a predetermined distance on each side of the short side in this embodiment. The striking machine 50 (50A, 50B) is arranged opposite.

The hitting machine 50 has a circular pad 52 as in the prior art, and is attached to a hitting shaft 54 where the pad advances and retreats. The pad 52 is made of rubber or rubber. The hitting force (impact force) given by the cathode ray tube 10 is a fraction of the conventional value, for example, 1.0 to 2.0.
It may be about 0G.

Next, a cleaning process (a process of discharging foreign matters) using the in-pipe cleaning device 30 configured as described above will be described. First, as shown in FIGS. 1 and 2, a pair of hitting machines 50A, 50A,
0B is arranged. Also, the neck part 1 of the funnel 14
The air suction pipe 32 is inserted from the side 4a. Although the insertion position of the air suction tube 32 is arbitrary, a position closer to the anode terminal 44 is preferable from the viewpoint of suction and suction of the foreign matter 19.

An air pump 40 is connected to the air suction pipe 32 via a connection pipe 38. Then, one end of the high voltage generator 46 is connected to one end of the air suction pipe 32,
The other end is connected to the anode terminal 44. In this state, the high voltage generator 46 and the air pump 40 are driven. The high voltage generated by this driving is applied between the anode terminal 44 and the tip 32a of the air suction tube 32.

As a result, the inside of the pole tube 10 becomes a space (electric field) to which a high voltage (plus voltage or minus voltage) is applied, and foreign matter (including foreign matter adhering to the inner wall surface of the tube) 19 floating in the tube is eliminated. It is charged by this high voltage.

On the other hand, since the air pump 40 is operating, the air in the pipe is sucked from the tip of the air suction pipe 32. As a result, the charged foreign matter 19 is sucked from the tip portion (tip opening portion) 32a of the air suction tube 32, or a bare portion (not covered with the insulating film 34) of the air suction tube 32 which is one electrode. This foreign matter is adsorbed to the tubular part).

During the charging process, a pair of beating machines 50A, 5A
0B is driven to apply a predetermined impact force to the cathode ray tube 10. Due to this impact or vibration, the foreign matter 19 adhered to the inner wall surface of the cathode ray tube 10 or the frame of the aperture grille 18 is easily peeled off and floats in the tube. The foreign matter 19 that has begun to float is more likely to be drawn toward the air suction pipe 32, so that the dusting force is increased by hitting.

A predetermined time (5-1 to 1) from the start of the cleaning operation
0 minutes), the high voltage generator 46 is stopped,
Then, pull out the air suction pipe 32 from the neck part 14a side,
The foreign matter adhering to the air suction pipe 32 is removed and cleaned. When the cleaning is completed, the operation of removing the foreign matter is repeated through the same steps described above. Usually, the pipe cleaning operation is completed in 1 to 3 times.

By simultaneously performing such charging, tapping, suctioning, and suction operations, foreign substances floating in the pipe and foreign substances adhering to the aperture grill 18 and the like can be almost completely discharged out of the pipe. As a result, the in-pipe cleaning ability can be remarkably improved as compared with the related art.

Further, since the hitting force can be reduced to a fraction of the conventional value, the impact force on the panel 12 can be reduced accordingly, and no vibration is applied from the tube surface 12a side. The peeling of the film 27 hardly occurs. The generation of surface flaws of the surface treatment film 27 can also be avoided. Further, in the conventional method, the occurrence of a displacement of the aperture grille 18 and the like is slightly observed. However, since the hitting force can be reduced, this point can be improved. In the above-described embodiment, air suction and beating may be performed at the stage when the charging process is completed.

[0029]

As described above, according to the present invention, a foreign substance (including a foreign substance adhering to the inner wall surface of a tube) of a cathode ray tube is charged, and an air suction tube used for charging is used. The inside of the pipe is cleaned by sucking the air inside the pipe from above to efficiently suck and adsorb foreign matter into the air suction pipe.

By doing so, even if foreign matter adheres to the inner wall surface of the tube or the aperture grill, etc., the foreign matter is easily charged and attracted to the air suction tube by charging the foreign matter. And the dust collecting effect can be enhanced. Therefore, by simultaneously applying vibration to the cathode ray tube, the dust collecting effect is further enhanced, and the inside of the tube can be efficiently cleaned.

Since the cathode ray tube is hit from the panel skirt portion as much as possible, the peeling and surface flaw of the surface treatment film formed on the panel tube surface can be improved, and the occurrence rate of defective products can be greatly reduced. it can. Further, since the cleaning ability is not deteriorated even if the hitting force of the hitting machine is suppressed to a low level, the method has a feature that the number of defective products can be reduced accordingly. Therefore, the present invention is extremely suitable for application to a tube cleaning method for cleaning the inside of various cathode ray tubes.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of the arrangement of an in-tube cleaning device for realizing a method of cleaning the inside of a cathode ray tube according to the present invention.

FIG. 2 is a side view thereof.

FIG. 3 is a layout view of a conventional pipe cleaning apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Cathode tube, 12 ... Panel, 14 ... Funnel, 16 ... Phosphor, 18 ... Aperture grille, 30 ... In-pipe cleaning device, 50 ... Striker,
32: air suction pipe, 40: air pump, 4
6 High voltage generating means

Claims (7)

[Claims] 1. A method for cleaning the inside of a cathode ray tube, comprising: inserting an air suction tube from a neck portion side of the cathode ray tube;
A predetermined voltage is applied between the air suction tube and the anode terminal of the cathode ray tube to charge foreign matters floating in the tube of the cathode ray tube, and the air in the cathode ray tube is sucked by the air suction tube. The inside of the cathode ray tube is cleaned by suctioning and attaching the foreign matter to the air suction tube to clean the inside of the cathode ray tube. 2. The cathode ray tube according to claim 1, wherein a vibration is applied to the cathode ray tube by using a hitting machine arranged outside the cathode ray tube while charging foreign matter in the cathode ray tube. A method for cleaning the inside of a cathode ray tube. 3. Applying a predetermined high voltage between the air suction tube and the anode terminal using a high voltage generating means to charge foreign matter floating in the cathode ray tube. 2. The method for cleaning the inside of a cathode ray tube according to claim 1, wherein: 4. The method for cleaning the inside of a cathode ray tube according to claim 1, wherein a metal tube coated with an insulating film at a portion inserted into the cathode ray tube is used as the air suction tube. . 5. The method for cleaning the inside of a cathode ray tube according to claim 1, wherein vibration is applied to the panel side of the cathode ray tube by the hitting machine. 6. An air suction tube inserted from a neck portion side of a cathode ray tube, a high voltage generator connected between the air suction tube and an anode terminal of the cathode ray tube and applying a predetermined voltage; And an air pump connected to the air suction tube. The foreign matter floating in the cathode ray tube is charged, and the air in the cathode ray tube is sucked by the air suction tube to remove the foreign matter. An apparatus for cleaning the inside of a cathode ray tube, wherein the inside of the cathode ray tube is cleaned by suctioning and adhering to an air suction tube. 7. The cathode ray tube according to claim 6, wherein the cathode ray tube is vibrated by using a hitting machine disposed outside the cathode ray tube while charging the foreign matter in the cathode ray tube. Cleaner for cathode ray tube.