JPS58176849A - Reproduction method of crt - Google Patents

Abstract

PURPOSE:To obtain a reproduced CRT with high reliability by cutting off the neck portion of a CRT bulb to remove a failed electron gun then injecting a cleaning liquid into the bulb to clean part of the bulb inside and sealing a new electron gun after drying. CONSTITUTION:When a CRT 1 flashed by a getter unit 4 is to be reproduced, the neck portion 1a of a bulb body 1 is cut off then a cleaning liquid injection nozzle 10 is inserted into the bulb body 1 to wash off the hydroxidized or oxidized deposition film, then the humid bulb inside is dried up. The nozzle 10 capable of spraying the cleaning liquid (a) to the inside of the bulb body 1 except for a luminescent screen 9 is used. Water or acidic aqueous solution with a normal temperature or high temperature is used for the cleaning liquid (a). Neck joint is performed to the bulb body 1 thus cleaned and dried to seal a new electron gun then the bulb is exhausted. Thereby, a reproduced CRT with extremely high reliability can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for regenerating a cathode ray tube. "Remanufacturing" here does not mean simply collecting and remanufacturing cathode ray tubes (hereinafter referred to as CRTs) that have been shipped to the market for some reason, such as if the electron gun is defective. Even if the CRT is not shipped to the market, it includes the remanufacturing of a completed CRT at any time for the purpose of repair, modification, or improvement, such as when a defective part is discovered in a production fin.

Conventionally, in the case of CRTs that have been subjected to Getter-Fuwotsu V-Using, for example, the Kafu tube, there is no abnormality in the fluorescent surface, but the electron gun is defective, or the glass in the neck part of the vibe that makes up the CRT is defective. As shown in Figure 1, which shows the conventional recycling process, the CRT to be recycled is made by cutting the pulp neck, removing the defective electron gun or defective neck, and then connecting a new neck tube. The electron gun is sealed in the tube, and then the inside of the tube is evacuated to blow away the getter agent. after that,
A remanufactured CRT is completed after going through a rolling aging process to stabilize the electron emission from the new electron gun.

CRTs regenerated by such conventional remanufacturing methods generally have disadvantages such as poor withstand voltage characteristics, and a large number of condensations in masks such as shadow masks, resulting in significantly inferior surface quality during use. The reason for this will be explained in detail with reference to FIG. 2, which shows a longitudinal section of a CRT as a cuff picture tube.

Conventionally, when manufacturing a CRT, a support piece (3) was attached to the electron gun (2) housed in the neck part (1a) of the tube body (1), and a getter was attached to the tip of the support piece (3). Device (4
) is fixed, and this device (4) is located inside the tube (1). At this time, the getter device (4) is connected to the 7-flank part (1) of the tube body (1) via the spring (Is).
1)) is in contact with the conductive coating (6) applied to the surface.

In addition, the getter device (4) is filled with a getter agent (4a) and heated to about 900 to 1000° C. by a high-frequency heating device in the exhaust process. When heated in this manner, the getter agent (4a) in the getter device (4) becomes metal vapor and scatters, and is vapor deposited on the inner wall of the tube α) to form a vapor deposited film (7). However, if the metal vapor is deposited on the fluorescent surface (9) formed on the inner surface of the face plate (1) of the tube body (1), the brightness will decrease and the brightness will become uneven. The device (4) has a fluorescent surface (
9) Getter V-jlL/ to prevent metal vapor from scattering to
(4b) is provided. This getter shield (
4b), the scattered metal vapor of the getter agent is mostly deposited on the inner wall of the funnel part (1b), and in particular, a large amount is deposited around the getter device (4).

When regenerating the CRT manufactured in this way, when the neck part (1a) is cut and the inside of the tube body (1) is exposed to atmospheric pressure, the barium, which is the getter agent, is scattered and interacts with moisture and oxygen in the air. It reacts with barium hydroxide and barium oxide to form barium hydroxide and barium oxide, which makes it very easy to peel off from the inner wall of the tube (1). This causes the CRT's dielectric strength to deteriorate and the mask to clog, but especially for the getter device (
4) On the inner wall of the tube body (1) around the evaporated film (7)
Since it is relatively thick, when it is peeled off, it peels off in the form of fairly thick flakes, resulting in a significant drop in electrical resistance at that location, which is likely to cause clogging of the mask.

Therefore, the present invention was made in order to eliminate the above-mentioned drawbacks, and is intended to provide a highly reliable and high quality CRT for cleaning a part of the inside of the tube body of a CRT to be regenerated.
The purpose of this invention is to provide a CRT playback method that can play back .

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 4, in the regeneration method according to the present invention, there is a gap between the neck cutting step and the neck joining step in the conventional regeneration method shown in FIG. A process for cleaning the deposited film and a process for drying the adhering liquid accompanying the cleaning are added. That is, after cutting the neck part (1a) of the tube body (1), insert the cleaning liquid injection nozzle /I/(g) into the tube body (1) as shown in FIG.
) to wash off the hydroxide and oxidized vapor deposited film, and then moisten and dry the inside of the nine-tube body. When the injection nozzle A/) is inserted into the tubular body (1) and the cleaning liquid ←) is injected, the cleaning liquid layer forms on the tubular body (1) except for the fluorescent surface (11) (Fig. 1). Any configuration may be used as long as it can be sprayed onto the inner wall.

As the cleaning solution, either room temperature or heated water or a dilute acidic aqueous solution can be used.According to experiments, if water is used, the cleaning time is 30 to 60 seconds, but if a diluted acidic aqueous solution is used, the cleaning time will be longer. I found out that I can save time.

According to the experimental results, the CRTs regenerated in this way were comparable to new products in terms of withstand voltage characteristics and the quality of the fluorescent surface.

As explained above, it is clear that a regenerated CRT with extremely high reliability can be obtained by cleaning a portion of the inside of the tube to remove unnecessary deposited films before regenerating the CRT.

As a result, there are effects such as reducing the incidence of defective products during the production of 4T, and further increasing reliability in the market.

[Brief explanation of the drawing]

FIG. 1 is a process diagram showing a conventional CRT regeneration method, FIG. 2 is a schematic cross-sectional view of a CRT to explain the manufacturing process, and FIG. 3 is a diagram of a CRT during cleaning according to the present invention. The schematic diagram, FIG. 4, is a process diagram of the regeneration method of the present invention. (1)... tube body, (2)... electron gun, (4)...
Getter device, (6)... conductive film, (7)...
Deposited film, shout...nozzle. Note that the same reference numerals in the figures indicate parts corresponding to the same mechanism. Agent Shin Kuzuno (1 other person)

Claims (1)

[Claims] (1) A method for remanufacturing a cathode ray tube that has been destroyed, in which the neck part, which together with the fluorescent surface and funnel part constitutes the pulp of the cathode ray tube, is cut off to remove the built-in defective electron gun. After taking out the tube, a cleaning liquid is injected into the pulp to clean a part of the inside of the tube, and after drying, a neck joint is performed and a new electron gun is enclosed, and the inside of the tube is then evacuated. Method. Q) The cathode ray according to claim 1, wherein the part inside the tube is the funnel part and the nine neck part remaining after being cut, and the cleaning liquid is water or an acid aqueous solution. How to regenerate pipes.