KR20010076459A - Method manufacturing Funnel in Color CRT - Google Patents

Abstract

PURPOSE: A method of manufacturing a funnel of a color cathode ray tube is provided to form Al-Cu alloy to an inner and outer planes as a conductive film with a vacuum deposition method. CONSTITUTION: In a method of manufacturing a funnel(12) of a color cathode ray tube, a conductive film is formed by applying Al-Cu alloy material to an inner and outer planes of the funnel. The funnel is coupled with a panel which forms a screen to form a cathode ray tube. The conductive film is composed of 45 to 99 % of Al and 55 to 1 % of Cu by weight. Also, the conductive film is formed with a vacuum deposition method. Therefore, instead of a graphite, the Al-Cu alloy is applied to the inner and outer plane of the funnel with the vacuum deposition method.

Description

Method for manufacturing funnel of color cathode ray tube {Method manufacturing Funnel in Color CRT}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a funnel of a color cathode ray tube, and in particular, a conductive film formed on the inner and outer surfaces of the funnel is formed of an A1-Cu alloy using a vacuum deposition method, thereby reducing cost and improving product characteristics and reliability. It relates to a method for producing a funnel.

Referring to the operation principle of a general color cathode ray tube, the front glass called the panel 10 and the rear glass called the funnel 12 are combined in the cathode ray tube shown in FIG. 1, and the inner surface of the panel serves to emit light. There is a fluorescent surface 11, a shadow mask 13 for selecting colors so that the source of the electron beam emitting the fluorescent surface emits an electron gun and a predetermined phosphor, and a frame 15 supporting the same.

In addition, a spring 16 for coupling the frame 15 assembly to the panel 10 and an inner shield 17 that serves as a shielding function so that the cathode ray tube is less affected by external geomagnetism during operation are fixed to the frame 15. It is sealed by high vacuum. Here, the spring 16 is usually made of a metal, and has good contact with the graphite to be electrically conductive so that high pressure can be applied.

Then, in the electron gun embedded in the neck of the funnel 12, the electron beam strikes the fluorescent surface 11 formed on the inner surface of the panel 10 by the anode voltage applied to the cathode ray tube. Before reaching the fluorescent surface 11, the deflection yoke 14 is deflected up and down and left and right to form a screen.

In addition, there are two, four, and six-pole magnets 18 (magnets) that correct the traveling trajectory so that the electron beam strikes a predetermined fluorescent substance, thereby preventing poor color purity.

In addition, the funnel 12, which is the rear glass, is coated with internal graphite and external graphite, respectively.

The operation of the cathode ray tube configured as described above will be described with reference to FIG. 2.

The color cathode ray tube reproduces a color image by hitting the fluorescent surface 11 formed on the inner surface of the panel 10 from an electron gun embedded in the neck of the funnel 12. Internal graphite 12-1 is applied to the inner surface, and external graphite 12-2 is applied to the outer surface.

Built-in graphite (12-1) is composed of the neck built-in graphite in the neck portion, the soft flash built-in graphite in the soft flash portion, the cone portion in the built-in graphite, there are also those made of the floating coated graphite in the soft flash portion and the cone portion.

Here, the role of the cone embedded graphite is to make the electron gun, the shadow mask and the fluorescent surface conductive through the cavity, the soft flash embedded graphite has an electrical conduction path to the soft flash portion of the funnel, the neck embedded graphite is the This is to reduce the vibration of the FBT output voltage by acting as a smoothing capacitor together with the external graphite by having an electrical conduction path in the neck part.

Floco-coated graphite also plays a role of cone-contained graphite and soft-flash graphite, and is often used for large cathode ray tubes because of its good workability.

The properties required for the built-in graphite include good conductivity, strong adhesion to glass, low gas release, heat resistance, and no peeling even from the contact with the metal spring 16, even at the BSC contact pressure (about 200 g) at the neck. Should have strength.

This is because when the embedded frame 12-1 is peeled off without being able to withstand the contact of the metal spring 16 during insertion, such as through the process of inserting the mask frame structure 13, 15, 16 into the funnel 12, etc. It acts as a foreign substance and causes spark defects, which results in poor withstand voltage characteristics, and when the application state is poor, a high pressure conduction defect that causes a flickering screen may occur.

In addition, the outer graphite 12-2 is applied to the outside of the funnel 12 with a roller to have an electrically conductive film, which acts as a smoothing capacitor together with the embedded graphite 12-1, and serves as an electric field shielding outside the cathode ray tube. In order to act as a smoothing capacitor, the conductivity must be good.

Since the conductivity of the graphite film is better as the graphite particles are denser, the thicker the graphite film is, the more graphite is applied and the better the conductivity is. Do.

As described above, since the inside and outside surfaces of the color cathode ray tube must be coated with internal graphite and external graphite respectively, enormous equipment investment required for coating / firing should be made, and toxic to the composition of internal and external graphite used. Because it contains drugs, it is harmful to the human body and requires great care in storing and handling the drugs.

In addition, when the vibration occurs due to friction with the internal metal parts (Contact Spring, Frittable Getter), which acts as a conduction during vibration, it causes a spark failure and adversely affects the breakdown voltage characteristics, thereby degrading the product quality. There was this.

Accordingly, an object of the present invention is to form Al-Cu alloy as a conductive film on the inside and outside of the funnel using vacuum deposition instead of forming a graphite conductive film on the inside and outside of the funnel, thereby reducing costs and characteristics of the product. The present invention provides a method for producing a funnel of a color cathode ray tube capable of improving reliability.

Technical means of the present invention to achieve the above object, in combination with the panel forming the screen to form a conductive film by applying an Al-Cu alloy material in a vacuum deposition method on the inner and outer surfaces of the funnel constituting the cathode ray tube, The conductive film is characterized in that the Al is 45 to 99%, Cu is composed of a content ratio of 55 to 1%.

1 is a side cross-sectional view of a typical color cathode ray tube,

2 is a view showing a funnel structure according to the prior art,

3 is a view illustrating a conductive film deposition method of a funnel according to an embodiment of the present invention,

4 is a graph showing a material (Al-Cu) state of the conductive film applied to the present invention.

Explanation of symbols on the main parts of the drawings

10: Panel 12: Funnel

12-1: Inner Conductive Film 12-2: Outer Conductive Film

19: Anode 21: Deposition Jig

23: vacuum chamber 25: metal pallet

27: electric resistance heater

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

3 is a view illustrating a method of depositing a funnel according to the present invention. The funnel 12, the deposition jig 21, the vacuum chamber 23, the metal pallet 25, and the electric resistance heater 27 are illustrated. Shown.

In addition, the cathode ray tube according to the present invention has the same configuration as FIG. 1 except for the funnel 12 portion.

The funnel 12 according to the present invention vacuums the conductive film with an Al-Cu alloy component instead of conventional embedded graphite and exterior graphite composed of neck embedded graphite, soft flash embedded graphite, and cone embedded graphite or neck embedded graphite and flow coating embedded graphite. The chamber 23 is formed on the inner and outer surfaces of the funnel 12 by a vacuum deposition method.

As shown, the funnel 12 is set in the vacuum chamber 23 using the deposition jig 21, and then Al-Cu alloy is applied to the inside and outside of the funnel except for the high pressure part 19 by vacuum deposition. It will be deposited, a detailed description thereof is as follows.

First, the metal pallet 25 mainly composed of Al-Cu alloy is placed in the electric resistance heater 27, the chamber 23 is vacuumed, and power is applied to the heater 27. The high temperature (27) causes the metal component to evaporate and scatter to the funnel 12 on the opposite side.

Further, instead of heating with the heater 27 in a manner of scattering a metal component with a funnel, the electron beam may be irradiated and scattered. When irradiating an electron beam, it is possible to control fine energy at the time of scattering by adjusting the acceleration voltage of the electron beam, and when it accelerates strongly, the particles become finer because the metal component is scattered with higher energy, and the funnel 12 In the adhesive strength is enhanced.

The characteristics of the Al-Cu alloy applied to the inner and outer surfaces of the funnel 12 will be described with reference to FIG. 4.

When pure Al is used as the conductive film of the funnel, the melting point of Al is 660 ° C and the resistivity is 2.82 mPa · cm.

The higher the melting point, the more heating should be done during vacuum deposition, and the higher the resistivity, the lower the resistance using more material.

Therefore, in the present invention, a Cu component is added to pure Al and used as a constituent material of the conductive film.

The melting point of Al-Cu alloy decreases as the Cu content increases, and when it reaches 33.2% by weight, the melting point of the Al-Cu alloy decreases to 548 ° C. Since the Cu resistivity is 1.72 mΩ · cm, the resistivity decreases as the Cu content increases. Even if less is used, sufficient electrical conductivity can be ensured.

As such, when the Al-Cu alloy material is used, the melting temperature thereof is lowered, and thus, the manufacturing cost is reduced because the work can be performed at a low temperature during vacuum deposition, and Cu has better electrical conductivity than Al. It will increase the shielding effect.

However, when the added Cu content exceeds 53.5% by weight fraction, the CuAl ₂ phase, which is an intermetallic compound, is formed and the melting point thereof is increased, so that the material composition of the conductive film according to the present invention is 45 to 99% of Al. , Cu is preferably composed of a content ratio of 55 to 1%.

Therefore, in the case of applying Al-Cu alloy of the present invention to the inner and outer surfaces of the funnel instead of applying the internal graphite and the outer graphite to the inner and outer surfaces of the conventional funnel 12, the FBT is sufficient to serve as a shielding and flat capacitor. The product's quality can be improved by reducing the ripple of output voltage.

In addition, since the conductive film is formed by the vacuum deposition method, the resistance can be easily adjusted by controlling the thickness of the internal and external conductive films according to the deposition conditions in the same amount of metal pallet, so that the resistance value can be applied differently according to the type of the product. There is also an advantage.

In addition, since it is deposited in a vacuum chamber, the workability is superior to that of the conventional coating method and management is easy because no chemical is used. The internal and external conductive film formed in this way is conventional internal and external graphite coating. Compared with the glass, the particles are finer and the thickness of the conductive film is small, so that the adhesive strength with the glass is strong and the film strength is strong. Thus, it withstands friction with the internal metal parts, emits less gas, and has excellent heat resistance. High voltage conduction failure will not occur.

Therefore, in the present invention, as described above, instead of using graphite as the conductive film on the inner and outer surfaces of the funnel, Al-Cu alloy is applied by a vacuum deposition method, thereby simplifying the coating process of the inner and outer conductive films of the funnel. It is possible to reduce the cost and reduce the cost, and to improve the withstand voltage characteristics and the reliability of the product by improving various membrane characteristics including conductivity, and to increase the market competitiveness. Excellent and easy to manage, there is an advantage that can significantly improve productivity.

Claims (3)

A method of manufacturing a funnel of color cathode ray tube, characterized in that the conductive film is formed by applying Al-Cu alloy material to the inner and outer surfaces of the funnel constituting the cathode ray tube in combination with the panel forming the screen. The method of claim 1, The conductive film, A method of manufacturing a funnel of a color cathode ray tube, characterized in that by weight fraction Al is 45 to 99%, Cu is formed in a content ratio of 55 to 1%. The method of claim 1, The conductive film, Method for producing a funnel of color cathode ray tube, characterized in that formed by vacuum deposition method.