KR100741053B1 - Cathode-ray tube preventing electrification and removing electron wave and preparing process thereof - Google Patents

Abstract

According to the present invention, in an antistatic and electromagnetic shielding cathode ray tube panel including a transparent conductive film and a transparent insulator protective film, the electrode is directly contacted with the transparent conductive film and the electrode, thereby grounding the electric charge more effectively than the grounding through the protective film. The present invention provides a cathode ray tube and a method of manufacturing the same, which effectively suppresses generation of static electricity and electromagnetic waves by providing a ground path through which charge on the surface of the cathode ray tube can easily escape while preventing damage.

Description

Cathode-ray tube preventing electrification and removing electron wave and preparing process

1 is a longitudinal sectional view schematically showing a panel of a cathode ray tube of the present invention.

<Brief description of symbols for the main parts of the drawings>

1 ... transparent conductive film 2 ... transparent insulator protective film

3 ... electrode 4 ... conductive adhesive tape

5 ... explosion proof band 10 ... glass panel

The present invention relates to a CRT tube having a structure of suppressing electromagnetic waves emitted from a cathode ray tube and a method of manufacturing the same, and more particularly, due to the phenomenon that charges are deposited on the surface of the cathode ray tube by electrons emitted from the cathode of the cathode ray tube. A cathode ray tube capable of effectively suppressing electromagnetic waves and a method of manufacturing the same.

By scanning an electron beam to the fluorescent film formed inside the panel, the fluorescent film maintains a positive potential applied at a high voltage. As a result, a high negative potential is formed on the outer surface of the panel. This causes an electric shock to the user in the form of static electricity or harms the human body in the form of electromagnetic waves. To suppress this, the surface of the panel must be grounded to provide a path to escape electrons.

Conventionally, various methods have been proposed in which a transparent conductive film is formed on the surface of a glass layer and the conductive film is grounded to prevent high potential from occurring on the outer surface of the front display of the cathode ray tube. Japanese Patent Nos. Hei 4-174945, Hei 4-116349, Hei 5-41187, Hei 8-287850, Hei 9-213244, and U.S. Patent No. 5025490 form a multilayer film (consisting of a transparent conductive film and a transparent insulator protective film), and a conductive adhesive thereon. Various methods of attaching a coated metal tape to a band and making an electrode thereon are disclosed.

However, the electric charge charged to the conductive film is grounded out through the metal electrode and the band, and in the conventional cathode ray tube having the insulating film formed on the outermost layer, the resistance value is interposed between the conductive film and the earth conductive tape. There was a problem that the Earth is not high enough to be made.

Accordingly, an object of the present invention is to provide an antistatic and electromagnetic shielding cathode ray tube and a method for manufacturing the same, which reliably earth the electric charges charged to the conductive film in the multilayer film formed on the outer surface of the panel and do not damage the electrode.

The present invention to solve the above problems,

In a cathode ray tube having a transparent conductive film on the outer surface of the panel and a transparent insulator protective film on the conductive film, an electrode is formed on part or all of the void screen of the panel and on the side of the panel before coating the transparent conductive film and the transparent insulator protective film. An antistatic and electromagnetic wave shielding cathode ray tube is provided, further comprising a conductive tape having a conductive adhesive for conducting the electrode and the explosion-proof band.

At this time, the electrode is preferably formed by applying a conductor colloid or paste. In addition, the conductor is preferably at least one metal particle or ruthenium oxide particle selected from the group consisting of silver, gold, copper, nickel, palladium, platinum, ruthenium and aluminum, or particles or fibers of graphite or carbon black. .

In addition, the electrode may be connected directly to the explosion-proof band and directly energized, and in this case, a general adhesive tape may be used instead of the conductive tape.

In addition, it is preferable that the conductive tape covers the transparent insulator protective film in the invalid screen in order to connect the electrode and the explosion-proof band and protect the electrode.

In order to solve the above problems, the present invention is also a step of applying a conductive colloid or paste to a part or all of the invalid screen of the panel and the side of the panel, coating a transparent conductive film and a transparent insulator protective film on the entire surface of the panel, heating it It provides a method of manufacturing an antistatic and electromagnetic shielding cathode ray tube, comprising the step of baking and curing, and attaching a conductive tape treated with a conductive adhesive to the formed electrode and connecting it to the explosion-proof band.

Hereinafter, the present invention will be described in more detail.                     

In the present invention, the material of the multilayer film is not particularly limited, but as the transparent conductive film, a film made of tin-doped indium oxide (ITO) , antimony-doped tin oxide ( ATO), or the like is used. It can be preferably used, and a film made of silica , alumina, zirconia, titania, or the like can be preferably used as the transparent insulator protective film.

The electrode formed in the present invention, serves to quickly remove the charge on the surface of the cathode ray tube, Improve the antistatic and electromagnetic shielding efficiency.

Further, the conductor colloid or paste of the present invention is not particularly limited, but is at least one metal particle or ruthenium oxide particle selected from the group consisting of silver, gold, copper, nickel, palladium, platinum, ruthenium and aluminum, It is preferable to form by mixing with a binder and apply | coating with materials, such as a particle | grain or fiber of graphite or carbon black.

Looking at the structure of the cathode ray tube panel of the present invention with reference to Figure 1, by forming an electrode before coating the transparent conductive film (1) has a structure in which the transparent conductive film and the electrode is in direct contact. This is a feature of the present invention by forming an electrode on the transparent insulator protective film 2 and exhibiting a much better grounding effect than grounding through the protective film.

In addition, as shown in FIG. 1, which is a longitudinal cross-sectional view, the conductive tape 4, which serves to connect the electrode and the explosion-proof band to conduct electricity, may be formed so as to cover not only the electrode but also the transparent protective film to partially cover the electrode. Can be prevented.

By applying a conductive colloid or paste to the explosion-proof band, it is also possible to extend the electrode to the explosion-proof band and directly ground the structure.

Hereinafter, the present invention will be described through examples.

Comparative Example 1

3.0 g of ITO fine particles having a Sn content of 10 at% were dispersed in a mixed solvent of 20 g of methanol, 67.9 g of ethanol, and 10 g of n-butanol to prepare a first composition (hereinafter referred to as coating solution A).

4.5 g of tetraethyl orthosilicate is mixed with a mixed solvent of 30 g of methanol, 50 g of ethanol, 12 g of n-butanol, and 4 g of pure water, to which 0.6 g of nitric acid and 0.047 g of silver nitrate (AgNO ₃ ) are added. Stirring at room temperature for about 24 hours to prepare a second composition (hereinafter referred to as coating liquid B).

50 cc of the coating solution A was poured while rotating the clean glass panel to about 90 rpm, and the rotational speed of the glass panel was raised to about 150 rpm to form a transparent conductive film. Then, 60 cc of coating liquid B was poured and applied in the same manner as coating liquid A to form a transparent insulator protective film. After drying, the panel surface temperature was maintained at 240 ° C. and fired for 30 minutes to form a transparent conductive thin film.

For grounding, a conductive tape treated with a conductive adhesive was attached to the transparent insulator protective film, connected to the explosion-proof band, and the explosion-proof band was grounded.                     

Example 1

Conductor colloids and pastes were applied to part or all of the ineffective screen of the panel, and coating liquid A and coating liquid B were prepared and applied to the panel in the same manner as in Comparative Example 1. This was heated and baked to form a transparent conductive film, a transparent insulator protective film, and an electrode. Then, a conductive tape treated with a conductive adhesive for grounding was attached to the electrode, connected to the explosion-proof band, and the explosion-proof band was grounded. At this time, it is preferable to apply a conductive tape so as to cover a part of the transparent insulator protective film for protecting the electrode.

The surface resistance of the transparent conductive thin film formed according to Comparative Example 1 and Example 1 was measured and shown in Table 1 below.

Electromagnetic Generation (V / m) Comparative Example 1 0.6 Example 1 0.45

The cathode ray tube according to the present invention is much more effective than grounding through a protective film because the electrode and the transparent conductive film are in direct contact, and damage to the electrode can also be prevented by applying an adhesive tape. As described above, the cathode ray tube of the present invention provides an grounding path through which charges on the surface of the cathode ray tube can easily escape, thereby effectively suppressing static electricity and electromagnetic waves, thereby increasing electromagnetic shielding efficiency.

Claims (8)

In a cathode ray tube having a transparent conductive film on the outer surface of the panel and a transparent insulator protective film on the conductive film, an electrode is formed on the side of the panel and part or all of the void screen before coating the transparent conductive film and the transparent insulator protective film. And an electroconductive tape having a conductive adhesive for conducting the electrode and the explosion-proof band, wherein the electrode is formed by applying a conductive colloid or paste. And electromagnetic shielding cathode ray tube. delete The antistatic and electromagnetic wave according to claim 1, wherein the conductor is at least one metal particle or ruthenium oxide particle selected from the group consisting of silver, gold, copper, nickel, palladium, platinum, ruthenium and aluminum. Shielded cathode ray tube. The antistatic and electromagnetic shielding cathode ray tube according to claim 1, wherein the conductor is a particle or a fiber of graphite or carbon black. The antistatic and electromagnetic shielding cathode ray tube according to claim 1, wherein the electrode is electrically connected to the explosion-proof band and is directly energized. The antistatic and electromagnetic shielding cathode ray tube according to claim 5, wherein a general adhesive tape is used instead of the conductive tape. The antistatic and electromagnetic shielding cathode ray tube according to claim 1, wherein the conductive tape covers the transparent insulator protective film in the invalid screen to protect the electrode while connecting the electrode and the explosion-proof band. Applying a conductive colloid or paste to part or all of the void screen of the panel and the side of the panel; coating a transparent conductive film and a transparent insulator protective film on the entire surface of the panel; heating, firing and curing the electrode; Method of manufacturing an antistatic and electromagnetic shielding cathode ray tube comprising the step of attaching a conductive tape treated with a conductive adhesive to the explosion-proof band.

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