JPS60200437A - Vibration dust remover for cathode-ray tube - Google Patents

Abstract

PURPOSE:To entirely eliminate causing flaws and cracks to the glass and make the processing of bulbs in a high temperature possible by transmitting the vibration of a vibration transmitter to the body to be removed with dust through a macromolecular film. CONSTITUTION:A macromolecular film 15 is interposedly arranged between a sealed bulb 11 and a vibration transmitter 14. By this arrangement the ultrasonic vibration from the vibration transmitter 14 is transmitted to the sealed bulb 11 through the macromolecular film 15 without directly contacting the surface of the sealed bulb 11, so that the possibility of causing flaws and cracks to the glass is entirely eliminated and even if the sealed bulb 11 is in a high temperature, the interposition of the macromolecular film relaxes the thermal shock in the process, also eliminating causing cracks to the glass due to the thermal shock.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a vibration dust removal device using ultrasonic vibration excitation of a cathode ray tube.

[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 neck integrated with funnel (2), (4) is a panel (1)
Frit glass (5) sealed between and funnel (2)
) is the fluorescent screen formed on the inner surface of the panel (1), (6) is the shadow mask, (7) is the conductive film formed on the inner surface of the funnel (2), and (8) is the shadow mask (6) and the conductive film. A conduction spring electrically connects the membrane (7), (8) an anode button sealed to the funnel (2), and (lO) an electron gun.

In general, during the manufacture of cathode ray tubes, there are many opportunities for various types of dust to be left inside the tube, such as floating minute substances during the manufacturing process, minute substances peeled off from manufacturing jigs, and minute substances peeled off from the material inside the tube. However, this dust extremely deteriorates the characteristics of the cathode ray tube. That is, in the cathode ray tube shown in FIG. 1, the minute substance forms a shadow mask (6).
If it adheres to the fine apertures of the cathode ray tube, the passage of the electron beam will be obstructed during operation of the cathode ray tube, resulting in localized non-light-emitting areas in the image. Furthermore, if the minute substance is conductive and adheres to the electron gun (10), the electron gun (10) will be damaged by the high voltage of about 10 KV applied during operation.
Dielectric breakdown of the electrodes that make up the battery may occur, resulting in sparks. For this reason.

In the manufacturing process of cathode ray tubes, several dust removal processes are generally provided to remove these dust particles.

FIG. 2 is an example of a vibration dust removal device using ultrasonic vibration.

In the figure, (11) represents panel (1) and funnel (2).
) is integrated with the sealing valve before the electron gun is enclosed, (1
2a) and (12b) are supports for the sealing valve (11);
13) is an ultrasonic vibration generator, and (14) is a vibration transmitter connected to the ultrasonic vibration generator (13).

To explain the operation of this device, first, the support (12a),
(12b) supports a sealing valve (11), and this "1"
A vibration transmitter (14) is brought into contact with a portion of the wearer/person's lubricant (11). The ultrasonic vibrations generated by the ultrasonic vibration generator (13) are transmitted to the sealing valve (1) via the vibration transmitter (14).
1), causing the sealing valve (11) to vibrate slightly. The dust adhering to the inside of the sealing valve (11) falls due to this microvibration, and is emitted by υ1 from the lower opening end of the neck (3) which is integrated with the funnel (2).

However, in the dual vibration dust removal device, since the vibration transmitter (X4) is made of metal, scratches or cracks occur on the glass surface due to minute vibrations at the contact part with the glass sealed bulb (11). However, for this reason, the sealing valve (11) may be destroyed during the heat treatment which is a post-process.

Conventionally, countermeasures against such drawbacks include weakening the ultrasonic vibration intensity and reducing the sealing valve (11) of the vibration transmitter (14).
), but none of these methods can be said to be perfect, and as a matter of course, the dust removal effect deteriorates.

Furthermore, if the sealing bulb (11) is at a high temperature immediately after heat treatment, the glass may cool rapidly at the contact area and cracks may occur, and another major disadvantage is that it is subject to process constraints such that work cannot be performed immediately after heat treatment. be.

[Summary of the Invention] This invention was made in order to eliminate the above-mentioned conventional drawbacks. A thin polymer film is disposed between a vibration transmitter and a dust object to be removed, and the vibrations of the vibration transmitter are transmitted through the thin polymer film. Vibration dust removal for cathode ray tubes that eliminates direct contact between the vibration transmitter and the object to be removed, eliminates scratches or cracks on the glass, and can be processed even with high-temperature bulbs. The purpose is to provide equipment.

[Embodiments of the Invention] The present invention will be described in detail below. FIG. 3 shows an embodiment of the present invention, in which (15) is a polymer thin film, and a sealing valve (15) is a thin polymer film.
11) and the vibration transmitter (14). Since the other configurations are completely the same as those in FIG. 2, the same parts are given the same reference numerals and the explanation thereof will be omitted.

According to such a configuration, the vibration transmitter (1
4) does not come into direct contact with the surface of the sealing valve (11), and even if ultrasonic vibrations are applied, the vibrations are absorbed by the polymer thin film (11).
15) to the sealing valve (11),
There will be no scratches or cracks on the glass, and even if the sealing bulb (11) is at a high temperature, the thin polymer film (
15), thermal shock is alleviated and no cracks occur due to this.

FIG. 4 shows another embodiment of the present invention, in which a vibration transmitter (1
4) coated with a polymer thin film (I5). In this embodiment as well, the same effects as in the case of FIG. 3 can be obtained.

Note that when the polymer thin film (15) is interposed between the sealing valve (11) and the vibration transmitter (14) as in each of the above embodiments, the transmission efficiency of ultrasonic vibration is slightly reduced. When a film made of a polyimide resin obtained by condensation polymerization of an aromatic tetrabasic acid and an aromatic diamine was used as the polymer thin film (15), this decrease was extremely small and excellent durability was obtained.

In each of the above embodiments, a sealed valve (11) in which a panel (1) and a funnel (2) are integrated as a dust object to be removed has been described.
It is clear that the same effect can be obtained for a single substance.

[Effects of the Invention] As explained above, according to the present invention, by interposing the polymer @M between the vibration transmitter and the body to be removed, there are no crow scratches or cracks. Furthermore, a vibration dust removal device having the excellent feature of being able to perform processing even when the valve is at a high temperature can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the schematic structure of a general cathode ray tube, Fig. 2 is a front view showing a conventional vibrating dust remover, and Figs. 3 and 4 are examples of the vibrating dust remover according to the present invention. FIG. (11) Sealing valve, (13) Ultrasonic vibration generator, (14) Vibration transmitter, (15) Polymer thin film. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Agent Masuo Oiwa Figure 1 Figure 2

Claims (2)

[Claims] (1) In a cathode ray tube vibration dust removal device that excites the object to be removed with the vibration of a vibration transmitter connected to an ultrasonic vibration generator, a thin polymer film is placed between the vibration transmitter and the object to be removed. A vibration dust removal device for a cathode ray tube, characterized in that the vibration of the vibration transmitter is transmitted to the object to be dust removed via the polymer thin film. (2) The vibration dust removal device for a cathode ray tube according to claim 1, wherein the thin polymer film is made of a polyimide resin obtained by polycondensation of an aromatic tetrabasic acid and an aromatic diamine.