KR930011244B1 - Method and apparatus for cleaning bulb of cathode-ray tube - Google Patents

Abstract

The cleaning method comprises the pressure air spray step inside of the bulb which is composed of the shadow mark frame and the other panel connected with the frame panel; the setting up step of the multiple magnets outside and inside of the bulb; the magnetic field forming step by inputting the electric potential on the multiple magnets; and the bulb cleaning up step using this magnetic force. The cleaning apparatus is composed of the cathode ray bulb (10); the nozzle which is inserted inside of the bulb; the multiple first magnet (22); and the second magnet (23).

Description

Bulb damping method of cathode ray tube and apparatus

1 is a cross-sectional view showing a bulb vibration suppression apparatus of a conventional cathode ray tube.

2 is a partial ablation side view showing a bulb vibration suppression apparatus of a cathode ray tube according to the present invention.

* Explanation of symbols for the main parts of the drawings

10 bulb 10a panel

10b: neck section 21 of the nozzle

22: first electromagnet 23: second electromagnet

The present invention relates to a bulb dust removing method and apparatus for a cathode ray tube, and more particularly, to a bulb dust removing method and apparatus for removing foreign matter attached to the inside of a bulb for a cathode ray tube.

Typically, the cathode ray tube is a panel formed with a fluorescent film and a shadow mask frame assembly is installed inside the panel, the panel is sealed with a funnel formed with a graphite conductive film therein, the neck of the funnel is an electron gun is sealed, In order to secure a free space in which the electrons emitted from the electron gun are smoothly moved, the inside thereof has a high vacuum atmosphere in which foreign substances are completely removed. In order to damp the inside of the cathode ray tube bulb in the manufacturing process of the cathode ray tube configured as described above, as shown in FIG. 1, an elongated pneumatic nozzle 2 is inserted through the neck of the bulb 10 and the compressed air While blowing the inside of the bulb 10 through the pneumatic nozzle (2) using the principle of blowing out the foreign matter attached to the inner surface of the bulb 10 or the shadow mask (3), inner shield (4), etc. To perform the vibration damping operation of the bulb (10). However, the conventional method of damping the inside of the bulb 10 has a problem that the foreign matter inside the bulb cannot be completely removed. That is, foreign matter is not removed because the air injected from the pneumatic nozzle 2 is not directly contacted between the shadow mask 3 and the inner surface of the panel and the outer circumferential surface of the inner shield 4. Therefore, there is a problem that the cathode ray tube becomes defective due to the foreign matter that is not removed, resulting in poor hole blocking of the shadow mask and scattering of the electron beam.

The present invention has been made to solve the above problems and to remove the foreign matter inside the bulb to fundamentally solve the cause of the defect caused by foreign matters to provide a bulb dedusting method and apparatus for the cathode ray tube to improve its reliability. There is a purpose.

According to an aspect of the present invention, there is provided a shadow mask frame assembly, a panel having the shadow mask frame assembly mounted therein, and a funnel sealed with the panel. Air is injected into the inside at a predetermined pressure so that the air injected into the bulb is discharged through the neck portion, and a magnetic field is applied to the neck portion side from the panel side to the inside and the outside of the bulb in a stepwise manner so that the blanket inside the bulb is closed. The magnetic field is characterized by being moved to the neck portion and discharged.

Apparatus suitable for carrying out the method of the present invention is a vibration suppression apparatus of a cathode ray tube bulb in which a panel having a shadow mask frame assembly is installed therein and a funnel sealed to the panel, wherein the apparatus is disposed therein through the neck portion of the bulb. A plurality of first electromagnets inserted and installed so as to be spaced apart from the upper end of the nozzle by a predetermined distance, and a plurality of second electromagnets spaced from the neck of the funnel by a predetermined distance from the neck of the funnel; It is characterized in that the foreign material can be removed by moving to the neck portion by applying a potential from the electromagnet located above the plurality of first, second, electromagnets to magnetize and demagnetize it.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment according to the present invention.

Bulb dedusting method of the cathode ray tube according to the present invention by injecting a high pressure air therein through the neck portion of the bulb provided with a shadow mask frame so that the foreign material is discharged by piggybacking to the air flowing into the neck portion, the bulb The magnetic field is gradually applied or removed from the panel side to the neck portion side so that foreign matters attached to the shadow mask inner shield and the bulb inside are moved to the neck portion side and discharged by the magnetic field. At this time, the magnetic field is preferably used alternating magnetic field.

In addition, as shown in FIG. 2, the vibration damping device according to the present invention, which is suitable for implementing the vibration damping method of the bulb 10, has a nozzle 21 that sprays high-pressure air into the bulb 10. It is inserted into the neck portion 10b of the, a plurality of second electromagnets 22 are installed on the outer peripheral surface of the nozzle 21 so as to be spaced apart from each other by a predetermined interval from the top and the bulb 10 outside the bulb 10 A plurality of second electromagnets 23 are spaced apart from each other by a predetermined distance from the panel 10a side of the bulb 10 to the neck portion 10b side so as to be adjacent to the outer circumferential surface of the bulb 10. Here, it is preferable to apply an AC voltage to the first and second electromagnets 22 and 23.

Referring to the vibration damping method in detail through the action of the bulb vibration damping device according to the present invention configured as described above are as follows.

First, in order to damp the bulb 10 of the cathode ray tube, a nozzle 21 having a plurality of first electromagnets installed on an outer circumferential surface thereof is inserted through the neck portion 10b of the bulb 10, and the bulb 10 of the bulb 10 is removed. The plurality of second electromagnets 23 spaced apart from each other at predetermined intervals are positioned on the outer circumferential surface thereof. In this state, the air damped through the nozzle 21 is injected at a high pressure, and a plurality of first and second electromagnets 22 and 23 provided on the outer circumferential surface of the nozzle 21 and the bulb 10 are connected to the panel ( Step by applying a voltage step by step from the electromagnet located on the 10a) to the electromagnet located on the neck portion 10b side to have a magnetic property. In this case, foreign matter attached to the shadow mask frame assembly of the bulb 10 is first discharged through the neck portion 10b by the high pressure air discharged from the nozzle 21, and the shadow mask frame assembly and the inner shield The metallic foreign matter attached to the first and second electromagnets 22 and 23, which generate magnetic force in steps from the panel 10a toward the neck portion 10b, is moved toward the neck portion 10b. It is to be discharged to the outside of the bulb by the air injected from the nozzle 21.

As described above, the present invention and the bulb dust removal method of the cathode ray tube and the device can completely remove foreign matters, especially metallic foreign matters to every corner of the bulb, and can fundamentally solve the hole clogging defect of the shadow mask caused by the foreign matter. There is an advantage that can improve the reliability of the cathode ray tube employing this.

Claims (3)

Injecting compressed air into a cathode ray tube bulb including a panel having a shadow mask plane assembly fixed therein and a panel sealed to the panel, and discharging the compressed air through the neck portion of the panel; In the bulb dust removal method of the cathode ray tube to remove the foreign matter therein, arranging a plurality of electromagnets at predetermined intervals inside and outside the bulb between the panel and the neck portion, and injecting air into the cathode ray tube And a step of applying a potential stepwise to an electromagnet positioned on the neck portion from the electromagnet positioned on the panel side at the same time as the step to form a magnetic field. The method of claim 1, wherein the magnetic field applied to the bulb is an alternating magnetic field. A cathode ray tube bulb 10 having a shadow mask frame assembly having a panel mounted therein, a panel sealed with the panel, and a neck portion for receiving an electron gun, and a nozzle inserted therein through the neck portion 10b of the bulb. In the vibration suppression apparatus of the cathode ray tube bulb provided with 21, the plurality of first electromagnets 22 provided so that a predetermined space | interval can be spaced downward from the upper end part of the said nozzle, and the neck part from the panel 10a side outside the said bulb. A plurality of second electromagnets 23 are provided to be spaced apart by a predetermined distance to the side of the (10b), and by applying a potential sequentially from the electromagnet located above the plurality of first and second electromagnets 22, 23 to magnetize Bulb dedusting device of the cathode ray tube, characterized in that the foreign material can be removed by moving to the neck (10b) side.