JPH0831322A - Method and device for manufacturing cathode-ray tube - Google Patents

Abstract

PURPOSE:To remove slurry sump perfectly without causing degradation of a fluorescent screen by contacting am endlessly continued wiping member with the inner surface of the skirt part of a face panel, and circulating it via a cleaning mechanism. CONSTITUTION:A slurry sump 5 formed at the inside surface of the skirt part of a CRT face panel is wiped off being attached to a ring-shaped rope 12 wound on a columnar support 11 energized by a spring 10 and contacted with the inside surface of the skirt part, and is immersed in a washing water tub 14 and eluded. When pulled up from the tub 14, the rope 12 is squeezed by a squeezing mechanism 15 to get rid of the washing water, and the cleaned rope is returned endlessly to the wiping part at the periphery of the support 11 to serve for removing the next slurry sump 5. Because all slurry sump 5 is attached to the rope 12 and removed, there is no risk of attachment to the skirt end face which functions as a seal face with the funnel part in later process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for removing deposits after forming a phosphor such as a color cathode ray tube, and more particularly to an apparatus and method for removing a phosphor slurry on the inner surface of a face panel.

[0002]

2. Description of the Related Art Generally, a fluorescent surface of a color cathode ray tube is formed by applying a phosphor suspension (hereinafter referred to as a phosphor slurry) containing a photosensitive polymerization agent on the inner surface of a face panel, exposing and developing the phosphor at a predetermined position. It is performed by forming fine dots on the. As shown in FIG. 2, the face panel 1 is formed of a front surface 2 having a phosphor surface, and a skirt portion 3 having a rising shape around the front surface 2. When the phosphor slurry 4 is injected into the inner surface of the face panel 1 and rotated and spread and applied, a slurry reservoir 5 which is an unnecessary phosphor slurry inevitably adheres to the inner peripheral surface of the skirt portion 3. The slurry pool 5 is cracked and scattered after drying, or is insufficiently dried and adheres to a transfer machine or the like in a subsequent process, which causes clogging of the shadow mask and inclusion of foreign matter. Therefore, after the skirt reservoir 5 attached to the inner peripheral surface of the skirt portion 3 is conventionally developed by the phosphor slurry 4,
As schematically shown in FIG. 3, the face panel 1 was rotatably supported by the rotative support portion 6, and the inner peripheral surface of the skirt portion 3 was washed over the entire circumference by the water flow 7 to remove the slurry reservoir 5. . By the way, in this method, since the slurry reservoir 5 is washed and removed only by the water stream 7, it cannot be sufficiently washed and removed unless the strong water stream 7 is used, and when the water stream 7 is strengthened, water splash occurs,
The water splash may reach the front surface 2 of the face panel 1 having the phosphor surface and deteriorate the phosphor surface. Therefore, for cleaning and removing the slurry reservoir 5 on the inner peripheral surface of the skirt portion 3, as shown in FIG. 4, a water flow 9 to which ultrasonic vibration is applied by an ultrasonic vibrator 8 is disclosed in Japanese Patent Laid-Open No. 6-12984.
Discloses a method of washing and removing.

[0003]

In the above-mentioned conventional techniques, since the slurry pool 5 is washed and removed by the water streams 7 and 9, the water splash cannot be completely eliminated, and there is no possibility of degrading the fluorescent screen. It won't disappear. Further, the water streams 7 and 9 from which the slurry reservoir 5 has been removed are discharged through the end face of the skirt portion 3 of the face panel 1 which is sealed with a funnel (not shown) and frit glass in a later step, so that the sealing is performed. The phosphor slurry 4 may be attached to the surface, which is also a cause of poor sealing and poor insulation.

[0004]

A method and apparatus for removing phosphor slurry adhering to the inner peripheral surface of a skirt portion of a face panel of a cathode ray tube, wherein a continuous endless wiping member is applied to the inner peripheral surface of the skirt portion. It is characterized in that they are arranged so as to be in contact with each other and are circulated through a cleaning mechanism installed outside. Then, at the portion where the wiping member is in contact with the inner peripheral surface of the skirt portion, it is a rope wound around the outer periphery of the columnar support, the rope is a rope at least the outer peripheral surface of which is covered with sponge, The cleaning mechanism is a cleaning liquid tank in which the wiping member is immersed, and the cleaning mechanism is provided with a squeezing means when the wiping member is lifted from the cleaning liquid tank.

[0005]

By using the apparatus of the present invention, the wiping member wipes off and removes the slurry pool on the inner peripheral surface of the skirt portion of the face panel, so that the slurry pool is completely removed without the generation of water splash that deteriorates the fluorescent screen. be able to. Further, the removed slurry reservoir adheres to the wiping member and can be reliably taken out of the face panel, and is removed from the annular wiping member by the cleaning mechanism, and the cleaned annular wiping member is fed to the inner peripheral surface of the skirt portion. Therefore, it is possible to completely prevent the phosphor slurry from adhering to the end surface of the skirt portion of the face panel that serves as the sealing surface.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. The same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. As shown in FIG. 1, the wiping device of the present invention is
A rope which is a continuous endless wiping member that is projected so as to come into contact with the inner peripheral surface of the skirt portion 3 of the face panel 1 and is slidably wound around the outer peripheral surface of the columnar support 11 urged by the spring 10. 12 is circulated by the circulation drive device 13. Then, the rope 12 is taken out to the outside at a position separated from the end face of the skirt portion 3 of the face panel 1 and immersed in the washing water tank 14 arranged in the lower part,
It is configured to be returned endlessly to the outer peripheral surface of the columnar support 11 via a throttling mechanism 15 installed in a portion pulled up from the wash water tank 14. On the other hand, the face panel 1 is rotated by a rotating device (not shown) while the inner peripheral surface of the skirt portion 3 is in contact with the rope 12 wound around the columnar support 11. Wiping removal work of the slurry reservoir 5 by this device is performed as follows. That is, the slurry pool 5 formed on the inner peripheral surface of the skirt portion 3 of the face panel 1 is wound around the cylindrical support body 11 which is urged and abutted by the spring 10 on the inner peripheral surface of the skirt portion 3. It adheres to the rope 12 and is wiped off, soaked in the washing water tank 14 and eluted. Then, when the washing water is pulled up from the washing water tank 14, the washing water is squeezed out by the squeezing mechanism 15 and cleaned, and the columnar support 1
It is returned to the wiping portion of the outer peripheral surface of No. 1 endlessly, and the next slurry pool 5 is wiped and removed. in this way,
Since all the slurry pool 5 to be removed adheres to the rope 12 and is removed, it does not adhere to the end surface of the skirt portion 3 which will be the sealing surface with the funnel in the subsequent step. When the rope 12 is made of a material having at least its outer peripheral surface covered with a sponge, the adhesion area is increased, so that the adhesion removal property and the cleaning removal property are improved. Although the example in which the rope 12 is used as the wiping member and the cleaning water tank 14 having the diaphragm mechanism 15 is used as the cleaning mechanism has been described above, the cathode ray tube manufacturing apparatus and the manufacturing method thereof according to the present invention are limited to the above configuration. It goes without saying that, for example, a belt-shaped member can be used as the wiping member, and an adhesive roller, a scraping hinge, or the like can be used as the cleaning mechanism.

[0007]

In the method of manufacturing a cathode ray tube using the apparatus of the present invention, the wiping member wipes and removes the slurry pool on the inner peripheral surface of the skirt portion of the face panel, so that no water splash that deteriorates the fluorescent surface is generated. In addition, the slurry pool can be completely removed. Also, the removed slurry pool adheres to the wiping member and can be reliably taken out of the face panel,
In addition, the cleaning mechanism removes the cleaning member from the wiping member, and the cleaned cleaning member is sent endlessly to the inner peripheral surface of the skirt portion. Therefore, it is possible to completely prevent the phosphor slurry from adhering to the end surface of the skirt portion of the face panel that serves as the sealing surface.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a cathode ray tube manufacturing apparatus showing an embodiment of the present invention.

[Fig. 2] Structure diagram of face panel

FIG. 3 is a block diagram of a cathode ray tube manufacturing apparatus showing a conventional example.

FIG. 4 is a configuration diagram showing an improved conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Face panel 3 Skirt part 5 Slurry pool 10 Spring 11 Columnar support 12 Rope (wiping member) 13 Circulation drive device 14 Wash water tank (cleaning mechanism) 15 Throttling mechanism (cleaning mechanism)

Claims (6)

[Claims] 1. A device for removing phosphor slurry adhering to an inner surface of a skirt portion of a face panel of a cathode ray tube, comprising:
An apparatus for manufacturing a cathode ray tube, comprising: a continuous endless wiping member disposed so as to abut the inner peripheral surface of the skirt portion, and a mechanism for circulating the cleaning material via an externally installed cleaning mechanism. 2. The apparatus for manufacturing a cathode ray tube according to claim 1, wherein the wiping member is a rope wound around the outer periphery of the columnar support at a portion contacting the inner peripheral surface of the skirt portion. 3. The cathode ray tube manufacturing apparatus according to claim 2, wherein at least the outer peripheral surface of the rope is covered with sponge. 4. A cathode ray tube manufacturing apparatus according to claim 1, wherein the cleaning mechanism is a cleaning liquid tank in which the wiping member is immersed. 5. The apparatus for manufacturing a cathode ray tube according to claim 4, wherein the cleaning mechanism is provided with squeezing means when the wiping member is lifted from the cleaning liquid tank. 6. A continuous endless wiping member is brought into contact with the inner peripheral surface of the skirt portion of the face panel of the cathode ray tube, and is circulated through a cleaning mechanism provided outside,
A method of manufacturing a cathode ray tube, comprising a step of removing a phosphor slurry attached to an inner peripheral surface of the skirt portion.