KR19980057663A - Method for forming charge of cathode ray tube and cathode ray tube having antistatic film - Google Patents

Abstract

A cathode ray tube having a screen surface on which an antistatic film is formed is disclosed. The antistatic film is composed of a base layer coated on the screen surface and a plurality of fibers vertically supported on the base layer, wherein fibers are used and the carbon fibers are immersed in the base layer.

Description

Method for forming antistatic film of cathode ray tube and cathode ray tube having this antistatic film

The present invention relates to a cathode ray tube, and more particularly, to a method of forming an antistatic layer formed on an outer surface of a panel to prevent antistatic and external light reflection and a cathode ray tube having the antistatic layer.

In general, the cathode ray tube is a transparent window as shown in FIG. 1 and has a panel 2 having a screen surface 2a for reproducing an image upon reproduction of a screen, and a fluorescent film 3 having a predetermined pattern formed on the inner surface of the screen surface. ), A shadow mask frame assembly (6) installed inside the panel (2), the funnel is sealed with the panel (2) to form an outer container of the cathode ray tube and the electron gun (5) is enclosed in the neck portion (7a) (7) and the deflection yoke 9 provided in the cone part 7b of this funnel 7 is provided.

The cathode ray tube 1 configured as described above is selectively deflected by the deflection yoke 9 according to the dice by the deflection yoke 9 to be scanned into the fluorescent film 3 to excite the respective phosphors, thereby producing an image. To form. The viewer who views the image thus formed may say that the viewer views the screen formed by the light emission of the fluorescent film formed on the inner surface of the panel.

However, since the screen surface 2a of the panel 2 for reproducing the image is a smooth glass surface and the light incident from the surroundings is specularly reflected, the brightness of the screen formed by the emission of the fluorescent film 3 is relatively lowered. The phenomenon appears. That is, when external light is incident on the outer surface of the panel, afterimages are generated on the screen surface of the panel by the external light, so that the reproduced screen and the afterimage overlap and the luminance and the resolution of the screen are reduced.

In addition, since the electron beam, that is, the beam current collides with the screen surface 2a of the panel 2, charges are accumulated during or after operation of the cathode ray tube. Accordingly, not only dust and the like are attached to the screen surface of the panel, but also an electric shock when the operator comes into contact with the screen surface, thus requiring special measures for antistatic.

In order to solve the above problem, conventionally, as shown in FIG. 2, a method of preventing reflection by forming irregularities 2b on the screen surface of the panel 2 by diffusely reflecting external light incident from the outer surface of the panel 2 is provided. Although it is used, the conventional method of forming surface asperity includes the etching method by hydrofluoric acid, the grinding method by sand brushing, etc. However, in the etching method, there is a problem in that hydrofluoric acid causes pollution problems and regeneration is difficult when defects occur in the process. According to the polishing method, problems such as uneven quality of the product and generation of process defects due to residual abrasives are caused. In recent years, the anti-reflective treatment by such a method has been significantly reduced in use.

Recently, in order to improve the problems caused by the above method, a method of applying a soluble silicate to the surface of a display to form an uneven pattern and then fixing it to a silicon dioxide (SiO 2) film by heating is proposed.

In addition, in Japanese Patent Application Laid-Open Nos. 61-118931 and 601-29051, an SiO 2 uneven film was produced by spray coating a hydrolysis solution of alkyl silicate (Si (OR) 4) on a panel outer surface of a cathode ray tube and curing at a temperature of 80 ° C. or higher. A method of obtaining an antireflection effect has been proposed.

As described above, the panel screen surface of the cathode ray tube is provided with various coating films for antireflection and antistatic, and the coating film is generally formed by including various dyes of various colors to improve the color of the reproduced screen. As the color, a dye of purple, purple, black, etc. is mainly used, and depending on the type thereof, it is called a lavender coating or ABC coating.

However, in order to form an antistatic film on the screen surface of the cathode ray tube as described above, an alkylsilicate (Si (OR) 4), which is an antistatic liquid, is sprayed onto the screen surface of the cathode ray tube that is continuously moved, and then rolled. By forming an antistatic film.

However, to form the antistatic film by spraying the antistatic liquid through the nozzle to the continuously moving cathode ray tube as described above, the antistatic layer is very scattered, such as the temperature of the tube, the nozzle injection time, the antistatic liquid, etc. There was a problem that the formation state of the is not constant. As a result, the quality distribution of the cathode ray tube is severe and becomes a quality deterioration factor.

In addition, the antistatic film formed as described above can not block the electromagnetic wave which is a problem recently. In order to improve the contrast of the screen, a dark tint panel is used. To do this, a panel must be manufactured separately and a separate safety glasses must be installed to protect the eyes of the user.

The present invention has been made to solve the above problems, and can block the emission of electromagnetic waves to the front surface of the panel, the antistatic film forming method of the cathode ray tube that can protect the user's eyes and the effect of the antistatic film and the cathode ray having an antistatic film The purpose is to provide a coffin.

1 is a cross-sectional view of a conventional cathode ray tube,

Figure 2 is an enlarged cross-sectional view showing a state in which irregularities are formed on the screen surface of the cathode ray tube for antistatic;

3 is a side view of partial ablation according to the present invention;

4 is a cross-sectional view showing another embodiment of an antistatic film;

5 is a side view schematically showing an apparatus for forming an antistatic film,

Explanation of symbols for main parts of the drawings

50; Panel 51; Screen side

60; Funnel 70; Electron gun

80; Deflection yoke 90; Antistatic film

91; Base layer 92; Carbon fiber

In order to achieve the above object, the present invention is a cathode ray tube comprising a panel having a screen surface, a funnel sealed to the panel and the electron gun is sealed in the neck portion, and an antistatic film formed on the screen surface, the charge The prevention film is characterized by consisting of a base layer coated on the screen surface and a plurality of fibers vertically supported on the base layer.

The base layer is formed by curing the liquid glass.

According to another aspect of the present invention, there is provided a method of forming an antistatic film of a cathode ray tube in which an antistatic film is formed on an inner surface of a panel having a screen surface, the method comprising: a first step of vertically placing an electrostatic fiber on a randomly arranged fiber; A second step of forming a liquid base layer for fixing the fibers on the screen surface of the second step; and a third step of allowing the fiber standing vertically to be attached to and supported by the liquid base layer by lowering the panel; And a fourth step of curing the base layer.

In the present invention, it is preferable that the base layer uses a transparent liquid glass, and the fiber preferably uses carbon fiber.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 shows an embodiment of a cathode ray according to the present invention.

As shown, the cathode ray tube is a panel 50 having a screen surface 51 having a fluorescent film 52 formed therein, and sealed to the panel, and an electron gun 70 is installed at the neck portion 61. The cone portion 62 includes a funnel 60 having a deflection yoke 80 and an antistatic film 90 disposed on the surface of the screen surface 51 to block external light reflection, static electricity and electromagnetic waves.

In the cathode ray tube, the antistatic film 90 has a base layer 91 formed on the surface of the screen surface 52, and fibers 92 are provided on the base layer 91 at a predetermined density. Here, it is preferable that the fiber uses a carbon fiber having a length of 0.3 to 0.6 mm. And the density of the fiber is preferably such that the transmittance is 40 to 60% when the formation of the antistatic film is completed. More preferably, as shown in FIG. 4, the fiber 92 is exchanged to the base layer 91.

In order to form the antistatic film configured as described above, first, as shown in FIG. 5, the fibers 92 are randomly disposed on the upper portion of the belt 101 on the endless track made of thin plates, and the lower surface of the belt 101 The static electricity is generated from the static electricity generator 102 to vertically set the fiber 92, that is, the carbon fiber to have a predetermined density.

As described above, the liquid phase is applied to the screen surface 51 of the panel 50 while the fiber 92 is vertically formed to form the base layer 91. When the formation of the base layer 91 is completed, the cathode ray tube is lowered so that the fiber 92 on the belt 101 is erected perpendicularly to the base layer 91 to be immersed.

When the fixing of the fiber to the base layer 91 is completed as described above, the antistatic film is completed by hardening the base layer. In the above method, it is preferable that the fiber uses glass fiber. It is preferable that the length is 0.3 internal 0.6 mm.

As described above, the antistatic film formed on the screen surface of the cathode ray tube has the following effects.

first; Since the antistatic film is made of carbon fiber, there is no need to use a dark panel to improve contrast as in the prior art.

second; Since carbon fibers having a predetermined length are used, specular reflection of external light can be prevented, and since the carbon fibers are conductive, the charge film can be contacted to reduce the generation of static electricity.

third; A fiber having a predetermined length is installed vertically to obtain the effect of safety glasses.

fourth; The viewing angle can be adjusted by adjusting the length of the fiber.

Although the present invention has been described with reference to the above-described embodiment illustrated in the drawings as an example, the present invention is not limited to the above-described embodiment and can be modified in various forms within the technical scope of the present invention.

Claims (7)

In a cathode ray tube comprising a panel having a screen surface, a funnel sealed to the panel and encapsulated with an electron gun at a neck portion, and an antistatic film formed on the screen surface, And a base layer coated on the screen surface of the antistatic film and a plurality of fibers vertically supported on the base layer. The cathode ray tube according to claim 1, wherein the base layer is formed by curing a transparent liquid glass. The cathode ray tube according to any one of claims 1 to 3, wherein the fiber is a carbon fiber. The cathode ray according to claim 1, wherein the fiber has a length of 0.3 to 0.6 mm. In the method of forming an antistatic film of a cathode ray tube to form an antistatic film on the inner surface of the panel having a screen surface, The first step of placing the fibers vertically on a randomly arranged fiber, A second step of forming a liquid base layer for fixing the fibers on the screen surface of the panel; A third step of lowering the panel so that the fibers standing vertically are attached to and supported by the liquid base layer; And a fourth step of curing the base layer on which the fibers are supported. 6. The method of claim 5, wherein the base layer is formed by curing a transparent liquid glass. 6. The method of claim 5, wherein the fiber is a carbon fiber.