JPH03179634A - Method and apparatus for ultrasonic-cleaning cathode-ray tube panel - Google Patents

Abstract

PURPOSE:To completely remove unnecessary light absorbing materials attaching to a panel in a short time by taking out a panel after the panel has been ultrasonic-cleaned while it is turned one or more turns and then radially spraying cleaning solution in a cleaning tank. CONSTITUTION:After a panel 1 is soaked in an ultrasonic-cleaning tank 6 and ultrasonic-cleaned while the panel 3 is turned one or more turns, the panel 1 is taken out from the cleaning tank 6 and then cleaning solution in the cleaning tank 6 is made overflow while the cleaning solution is radially sprayed from a cleaning solution spraying device 9 provided in the cleaning tank 6. In this case by turning the panel inside the cleaning tank 6, a cleaning effect is improved and light absorbing materials removed from the panel 1 by radially spraying the cleaning solution are immediately exhausted outside the tank together with the overflow. Thus unnecessary light absorbing materials attaching to the panel 1 can be completely removed in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ultrasonic cleaning method and apparatus for cathode ray tube panels.

[Conventional technology]

In the process of forming the phosphor screen of a black matrix color cathode ray tube, the process of forming a phosphor layer consisting of green, red, and blue phosphor pixels on the inner surface of the panel is usually done by applying graphite to the inner surface of the panel. Light-absorbing substances whose main components are
There is a step of forming a black matrix pattern layer using a light-absorbing material (called a light-absorbing material).

In the step of forming a black matrix pattern layer, first, an autoresist (photosensitive composition) is applied to the inner surface 1a of the panel 1 shown in FIG. A step of exposing the pattern formed on the mask to an autoresist is performed.

Next, the unexposed areas are washed off with water, and after drying, the panel 10
Apply a light-absorbing substance to the inner surface 1a, and remove the panel l as necessary.
After cleaning the pin 1b and thoroughly drying the panel l,
Pour an etching solution such as aocJl, )(t o, etc. onto panel l, wash off the light absorbing material in the exposed area,
Formation of the desired black matrix pattern is completed.

However, even after completing the above series of steps, unnecessary light-absorbing substances are still attached to the pins lb, skirt 1ls1c, and seal portion 1d of the panel 1 on which the blank matrix pattern is formed. complete removal is required.

Therefore, using a cleaning device called a rim washer device, an aqueous solution containing 10% by weight of ammonium fluoride is ejected from a nozzle toward each of the parts 1b, lc, and 1d. It has been proposed to wash off the absorbent material and further perform ultrasonic cleaning by holding the panel l in a holder 5a and immersing it in a cleaning liquid 3 in an ultrasonic cleaning tank 2, as shown in FIG. The ultrasonic oscillator 5 provided at the bottom of the cleaning tank 2 has a holder 5a, and 4 is an elevating device that can move the holder 5a up and down.

In this way, unnecessary light-absorbing substances adhering to panel 1 are cleaned and removed to improve the bonding between panel 1 and the funnel in the subsequent process, and after the completion of the cathode ray tube, residual light-absorbing substances can be removed. The amount of foreign matter inside the tube is reduced to prevent the performance of the cathode ray tube from deteriorating due to foreign matter.

h.Using ultrasonic waves to clean the panel is disclosed in, for example, Japanese Patent Laid-Open No. 62-252038.

[Problem to be solved by the invention]

Even after performing the series of conventional cleaning methods described above, excess light-absorbing material often remains in the portions 1b, lc, and 1d of the panel, and it is difficult to completely remove this. . In particular, if a film of light-absorbing material remained on panel pin lb, cracks would occur in the extended black matrix layer surrounding panel pin 1b during the later treatment process, and this would peel off, causing voltage withstand failure. .

Actually, the light-absorbing substance attached to the skirt part 1c of the panel 1 interacts with foreign matter inside the tube and deteriorates the performance of the cathode ray tube, and the light-absorbing substance attached to the seal part 1d causes a failure in joining (frit welding) with the funnel. It was causing such things.

Such undesirable problems occur in the ultrasonic cleaning process due to ultrasonic cavitation (a phenomenon in which ultrasonic cavitation occurs in the cleaning liquid due to ultrasonic waves, and these cavities collide with the object to be cleaned and rupture). This is because it is difficult to uniformly generate the cleaning agent (which is said to have a cleaning effect) in the tank, so uneven cleaning tends to occur on the panel 1. Further, since the light-absorbing substance that has been removed by washing re-adheres to the panel 1 in the cleaning tank, it is difficult to obtain a good cleaning result even if the cleaning takes a long time.

An object of the present invention is to provide a method and apparatus for ultrasonic cleaning of cathode ray tube channels, which can completely remove unnecessary light-absorbing substances adhering to the panel.

[Means to solve the problem]

The above object is achieved by rotating the panel one or more revolutions and performing ultrasonic cleaning while tx, then lifting the panel out of the cleaning tank, and then spouting the cleaning liquid radially within the cleaning tank.

The above object also includes a lifting means configured to hold a panel and allow the panel to be raised and lowered vertically, a rotating means for immersing the panel in an ultrasonic cleaning tank and rotating it one or more revolutions, and a cleaning liquid in the cleaning tank. a cleaning liquid jetting means for spouting the cleaning liquid radially;
This is achieved by providing an overflow means for discharging the cleaning liquid.

[Effect]

By rotating the panel in the cleaning tank, it is possible to apply ultrasonic cavitation to the entire inner surface of the panel, thereby improving the cleaning effect.

In addition, by spouting the cleaning liquid radially within the cleaning tank, forced convection of the cleaning liquid is effectively performed throughout the tank, and the light-absorbing substances removed from the panel are quickly discharged to the outside of the tank along with the overflow of the cleaning liquid. Ru. Therefore,
Since the next panel can always be ultrasonically cleaned with a clean cleaning solution, there is no problem of light-absorbing substances re-adhering to the panel.

〔Example〕

FIG. 1 shows an ultrasonic cleaning apparatus as an embodiment for carrying out the cleaning method of the present invention.

The cleaning Mu includes an ultrasonic cleaning tank 6, a lifting device 7 that holds the panel 1 and raises and lowers it up and down, a rotating means 8, such as a motor, that rotates the panel 1 in the cleaning 'wJ6, and the It comprises a cleaning liquid jetting device 9 which jets cleaning liquid, such as clean water, radially in the cleaning tank 6 under dynamic pressure.

Further, the cleaning tank 6 has an ultrasonic cleaning tank [10
An overflow mechanism 6a is provided so that cavitation is generated in the cleaning liquid 3 by the oscillated ultrasonic waves, and an overflow mechanism 6a is provided in which an excess amount of the cleaning liquid 3 overflows and is discharged from the water channel to the outside of the tank.

Using the above-described apparatus, first, the panel 1 to be cleaned is lowered by operating the lifting device 7, and immersed in the cleaning liquid 3 in the cleaning tank 6. Next, the panel 1 is rotated one or more revolutions by the motor 8, and the ultrasonic oscillator IO is operated while tx is being used to perform ultrasonic cleaning.

Here, since the panel 1 has a flat planar shape, if the panel 1 is rotated more than once, the ultrasonic wave will be applied to the entire inner surface of the panel 1. Even if the panel 1 is rotated more than 5 times, there is not much change in the effect. It is appropriate that the rotation speed is 1 to 5 rotations in about 40 to 600 seconds. If the rotation speed is decreased, it will take time; if it is increased too much, foaming will occur in the cleaning liquid 3, and the effect of the ultrasonic wave will be reduced.

Next, after completing the ultrasonic cleaning as described above, the lifting device 7 is operated to raise the panel 1 and separate it from the cleaning liquid 3. Next, the cleaning liquid jetting device 9 is operated, and the cleaning liquid introduced from the pipe 9a is jetted radially into the tank at a high pressure of about 3 to IK97 cd. Injection nozzle 9b
8 to 1 for those with a diameter of 0.5 to 0.511〆
It is sufficient to provide about two at equal intervals.

When the jetting device 9 configured in this manner is operated, the cleaning liquid 3 moves within the tank by forced convection, and the light-absorbing substances removed from the panel 1 by the ultrasonic cleaning are transported outside the tank for a short time with the overflow of the cleaning liquid. be excluded. The time period for which the cleaning liquid is jetted by the jetting device 9 is as long as the cleaning water in the cleaning tank 6.
It takes about 5 seconds for 5m.

By the above cleaning method, the cleaning liquid 3 in the cleaning tank 6 is cleaned, and the next panel is lowered by the operation of the lifting device 7.
Ultrasonic cleaning is performed again and the same steps as above are performed.

In this way, the action of ultrasonic cleaning and the cleaning action of the cleaning liquid in the cleaning tank work together to completely remove unnecessary light-absorbing substances adhering to the panel 1 in a short time.

〔Effect of the invention〕

According to the present invention, the panel is often cleaned, so that the problem of deterioration in the performance of the cathode ray tube due to poor cleaning may occur. Additionally, the cleaning time can be halved compared to conventional methods.
Ivy.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the ultrasonic cleaning device for cathode ray tube panels according to the present invention, in which (A) is a side sectional view of the main part, (B) is a sectional view of (A) as viewed from above, and FIG. 2 is a cathode ray tube panel ultrasonic cleaning device. FIG. 3 is a side sectional view of a main part of a conventional ultrasonic cleaning device for cathode ray tube panels. l...Panel, 2...Ultrasonic cleaning tank, 3...
- Cleaning liquid, 4... Ultrasonic oscillator, 5... Elevating device, 6... Ultrasonic cleaning tank, 6a... Overflow mechanism, 7... Elevating device, 8... Rotating means, 9 . . . Cleaning liquid ejecting device, 10 . . . Ultrasonic oscillation device.

Claims (1)

[Claims] 1. After the panel is immersed in an ultrasonic cleaning tank and subjected to ultrasonic cleaning while rotating one or more revolutions, it is lifted out of the cleaning tank, and then a cleaning liquid jet provided in the cleaning tank is A method for cleaning a cathode ray tube panel, comprising causing the cleaning liquid in the cleaning tank to overflow while jetting the cleaning liquid radially using a device. 2. In a cathode ray tube panel cleaning device having an ultrasonic cleaning tank equipped with an ultrasonic oscillator and a panel lifting means configured to hold the panel and move it up and down, the panel is soaked in the cleaning solution of the cleaning tank. A cathode ray tube panel characterized in that it has a rotating means for immersing it and rotating it one or more revolutions, a cleaning liquid jetting means installed in the cleaning tank and spouting a cleaning liquid radially, and an overflow mechanism for overflowing the cleaning liquid. cleaning equipment.