JPH022255B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a cleaning device for a sealing surface of a panel or funnel constituting a cathode ray tube envelope.

[Prior art]

FIG. 1 is a schematic cross-sectional view of a cathode ray tube. In the figure, 1 is a panel, 2 is a funnel, 3 is a net integrated with the funnel 2, 4 is a frit glass sealed between the panel 1 and the funnel 2, and 5 is an aluminum film formed on the inner surface of the panel 1. 6 is a shadow mask, 7 is a conductive film formed on the inner surface of the funnel 2, 8 is a conduction spring that electrically connects the shadow mask 6 and the conductive film 7, and 9 is an anode sealed to the funnel 2. Button 10 is an electron gun.

In order to operate the cathode ray tube shown in FIG. 1, it is necessary to apply a high voltage of about 30 KV from the anode button 9. Normally, the outer surface of the cathode ray tube is at ground potential, so a potential difference of 30 KV occurs between the inner and outer surfaces of the panel 1, funnel 2, and frit glass 4, and the quality of the electrical insulation between these is a very important issue. . If the sealing surfaces of the panel 1 and funnel 2 are sealed with the fritted glass 4 while the sealing surfaces are dirty, the electrical insulation of the sealed portion may be impaired, and sometimes dielectric breakdown may occur during operation, resulting in complete failure. Not only that, but high-voltage sparks can even cause a fire in the television set. Therefore, effectively cleaning the sealing surfaces between the panel 1 and the funnel 2 before sealing them is an important step for improving the electrical reliability of the sealed portion.

A conventional general seal surface cleaning device will be explained with reference to FIG. In the figure, 1 is the panel, 12 is the panel sealing surface, 13 is the panel side wall, 14 is the acid cleaning tank, 15 is the cleaning liquid put inside the acid cleaning tank 14, 16 is the water cleaning tank, and 17 is water cleaning. This is the rinsing water placed inside the tank 16. Further, reference numeral 18 designates a plurality of cleaning conveyance rollers arranged in parallel inside the acid cleaning tank 14 and the water cleaning tank 16 and connected to a rotation drive mechanism (not shown). The roller 18 is disposed so as to be partially immersed in the cleaning liquid 15 of the acid cleaning tank 14 and the washing water 17 of the water cleaning tank 16. Further, as the cleaning water 15, a glass-eroding soluble liquid such as hydrofluoric acid or acidic ammonium fluoride aqueous solution is generally used.

To explain the operation of such a device, first, panel 1
is moved above the cleaning tank 14 by the rotation of the roller 18 driven by the rotational drive mechanism, and at the same time,
The cleaning liquid 15 adhering to the surface of the roller 18 also adheres to the panel sealing surface 12, and the panel sealing surface 12 is eroded and dissolved by the action of the cleaning liquid 15, and dirt is also removed. Next, the panel 1 is moved to a water washing tank 16, and the washing water 17 comes into contact with the panel sealing surface 12 via a roller 18, similar to the acid washing section, and removes the washing liquid 15.

However, in the above-mentioned cleaning apparatus, when the panel 1 passes through the acid cleaning tank 14, the cleaning liquid 15
Not only does it adhere to the panel sealing surface 12, but due to the surface tension of the cleaning liquid 15 and the cleaning liquid being rolled up due to the movement of the panel 1, the cleaning liquid 15 also adheres to a part of the panel side wall 13, and this is transferred to the next washing tank. Even with the washing water 17 in step 16, it was not completely removed and remained on a part of the panel side wall 13, which was a drawback.

This residual cleaning liquid is deposited on the panel side wall 13 as a reaction product with the glass, and when the panel 1 and the funnel 2 are sealed together, it prevents the normal welding of the frit glass 4, and also after the completed cathode ray tube is completed. However, some deposits may peel off inside the tube, clogging the mask and reducing the quality of the fluorescent surface. Conventionally, attempts have been made to improve the washing effect by using soft materials such as sponges for the rollers in order to overcome these drawbacks, but these efforts have not been sufficient.

[Summary of the invention]

This invention was made to solve the above-mentioned conventional drawbacks, and it is possible to not only completely remove the cleaning liquid remaining on the side wall of the panel (or funnel), but also to clean the sealing surface including the side wall of the panel (or funnel). The present invention provides a sealing surface cleaning device for a cathode ray tube envelope, which makes it possible to dramatically improve the cleaning effect.

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the drawings.

In FIGS. 3 and 4, reference numeral 19 designates washing water discharge nozzles arranged in parallel between the rollers 18 in the water washing tank 16, one or more nozzles being arranged between each roller. The discharge part 19a of this discharge nozzle 19 faces upward, and the upper end surface of the discharge part is 1 to 10 mm higher than the roller upper surface plane 20, as shown in FIG.
It is placed 2mm lower. Further, as shown in FIG. 6, the discharge portion 19a of the nozzle 19 may have a slit shape, or may have small holes arranged in a line as shown in FIG.

FIG. 8 is an example of a circuit diagram of the flushing water of the device according to the present invention, in which 21 is a water storage tank;
22 is a water pump, 23 is a flow control valve, 24
25 is a drain pipe, 25 is a water supply pipe, and 26 is a water storage tank drain pipe. Washing water is supplied by pump 2 from water storage tank 21.
2 and is discharged from the discharge nozzles 19, and each discharge nozzle 19 is provided with an adjustment valve 23, respectively. Overflow water in the water washing tank 16 forms a circulation circuit that returns to the water storage tank 21 via a drain pipe 24. Fresh water is constantly supplied into the water washing tank 16 from the water supply pipe 25, and the water storage tank drain pipe 26
Some of the wash water is discharged.

Next, the operation of the above configuration will be explained.

As mentioned above, the tip of the discharge part of the discharge nozzle 19 disposed between the rollers 18 is installed only 1 to 2 mm below the upper surface plane 20 of the roller, so that the washing water discharged from the discharge nozzle 19 is It bulges several mm above the roller upper surface plane 20. When the panel 1 moves above the discharge nozzle 19 due to the rotation of the roller 18 in this state, the panel sealing surface 12 is aligned with the upper surface plane 2 of the roller.
0, the discharged water comes into contact with the lower part of the panel side wall 13 at a sufficient height and amount, and the acid cleaning tank 14
The cleaning liquid adhering to the panel side wall portion 13 is completely removed.

If a plurality of discharge nozzles 19 are installed, the amount of water discharged from each nozzle is adjusted with each adjustment valve 23, and by increasing the amount of water discharged one after another, the height of the discharge can be raised one after another, making it even more effective. washing with water is possible.

In addition, although the above embodiments have been described with respect to the water washing section, the present invention is not limited to the water washing section, and when the present invention is applied to the pickling section, cleaning can also be performed on the side wall of the panel, and in this case, By raising the discharge height of the water washing section to a level higher than that of the pickling section, it is possible to completely wash a wide range of the sealing surface.

Furthermore, although only the panel has been described so far, it is clear that the same effect can be achieved in cleaning the sealing surface of the funnel.

[Effects of the Invention] As explained above, the present invention arranges the cleaning liquid discharge nozzle in parallel with the cleaning conveyance roller,
Since the cleaning liquid is spouted upward from the nozzle,
A sufficient amount of cleaning liquid can be brought into contact with not only the surface conveyed by the rollers of the panel or funnel, that is, the sealing surface, but also the side wall thereof, and a complete cleaning effect can be obtained over a wider range.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a schematic structure of a cathode ray tube, FIG. 2 is a front view showing a conventional cleaning device, FIG. 3 is a front view showing a cleaning device according to the present invention, FIG. 4 is a plan view of the same, and FIG. FIG. 5 is a front view showing the positional relationship between the roller and the discharge nozzle, FIGS. 6 and 7 are perspective views showing examples of nozzle openings, and FIG. 8 is a circuit diagram showing the washing water circuit. 14...Acid cleaning tank, 15...Cleaning liquid, 16...
Water cleaning tank, 17...Washing water, 18...Washing conveyance roller, 19...Nozzle. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A cathode ray tube outer enclosure comprising a cleaning tank and a plurality of cleaning conveyance rollers arranged in parallel in the cleaning tank, and a nozzle for jetting cleaning liquid upwards arranged in parallel with the rollers. Equipment for cleaning the sealing surface of containers.