KR20020086844A - A manufacturing process and a screen barkcover which cut off an electron beam - Google Patents

Abstract

PURPOSE: A back cover for shielding electron waves of an image device and a method for manufacturing the same are provided to obtain a light-weight back cover at a low cost while maintaining the conductive property for shielding the micro current and the electron wave. CONSTITUTION: A method for manufacturing a back cover for shielding electron waves of an image device includes the steps of preparing a back cover main body with polymer synthetic resin by vacuum forming technology, carrying out base coating to the main body of the back cover, vacuum-depositing a conductive metal material to an outside of the main body of the back cover by using a vacuum depositing machine, and carrying out top coating for the main body of the back cover, wherein the conductive material is to be aluminum, nickel, chromium and copper, and the main body of the back cover is formed of a non-conductive material.

Description

A manufacturing process and a screen barkcover which cut off an electron beam}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back cover which is applied to various video apparatuses such as LCD TVs, PDP TVs, LCD monitors, etc., which are widely used, and functions to protect and monitor electromagnetic waves inside the monitor.

Conventionally, the back cover of a video device can be divided into two functions, a protection function inside a monitor and a function of suppressing leakage of electromagnetic waves by blocking external leakage of microcurrent. Since the harmfulness of electromagnetic waves has been widely known, various functions related to suppressing electromagnetic waves have been introduced, and the role of electromagnetic shielding has become more important in the back cover of an imaging device. Therefore, the back cover of a video device is usually manufactured using aluminum or iron or other metal, or a method of forming a synthetic resin back cover in consideration of aesthetics on the outside by installing a primary conductive back cover therein, and a conductive matrix or Mn-Zn-, Ni-Zn-, Mg-Zn- and the like, which are conductive materials on the synthetic resin material, were again coated and produced on the inner surface of the back cover. In other words, the big problem of the method of making a back cover of the conductive metal such as aluminum by means of press processing and the method of coating the conductive material on the disc of the back cover through injection has a high processing cost and a difficult process. There is an urgent need for technology that can solve the existing role even with low price and simplified process.

First of all, if you look at the patent related to the monitor back cover, you can look at the prior art related to the structure and manufacturing apparatus of the monitor back cover,

Patent No. 14352 relates to a monitor back cover injection molding apparatus in an injection molding machine. A gas injection device is attached to a general injection molding machine to inject molten values into a mold during an injection molding operation. The present invention relates to a monitor back cover injection molding apparatus in an injection molding machine capable of molding a monitor back cover by directly injecting the inside of a cavity, and an application number 20-1999-0005342 relates to a core coupling structure of a monitor back cover. The back cover main body and the core part consist of one mold, so when the core part is changed, the mold of the back cover body needs to be completely disassembled, changed to a new core, reassembled, and then injected. In the event of a core line, the core part can be removed from the back cover body to solve the problem that the monitor is not clean. Separate injection molding and the core part can be combined / separated into the back cover body, and the back cover body and core part molds are managed separately so that the time consumed because the disassembly / assembly process of the existing mold is not necessary when changing the core part. It is possible to save cost and to change core easily, and to improve the gap and aesthetic problems between core part and back cover body that can occur in single structure.

As described above, there is no prominent technology for the back cover through the film formation method of the conductor related to the electromagnetic wave blocking, which is one of the functions of the back cover. There is an urgent need for a way to use the back cover body of a variety of materials through a method that can achieve the economical effect while preventing any functional problems.

Accordingly, in the present invention, the invention was devised to solve the above problems, and when constructing the main body of the back cover by using a synthetic polymer compound, various insertable conductive materials are inserted to construct the main body of the back cover, It is easy to deposit aluminum, nickel, chromium, copper, etc. and vacuum-deposits a material with excellent conductivity on the main body of the back cover to form a conductive film on the back cover surface. The present invention was devised to provide a back cover capable of blocking and electromagnetic shielding.

1 is a process chart showing a preferred embodiment of the present invention

Figure 2 is a schematic diagram of a vacuum chamber showing a preferred embodiment of the present invention

3 is a cross-sectional view of the back cover of the present invention

4 is a configuration diagram of a conventional back cover cross section

■ Explanation of the major symbols used in the main parts of the drawings ■

1: chamber 2: jig 3: back cover hanger

4 tungsten filament 5 deposited metal 6 electrode

1 is a process diagram showing a preferred embodiment of the present invention, Figure 2 is a schematic configuration diagram of a vacuum chamber showing a preferred embodiment of the present invention, Figure 3 is a cross-sectional configuration of the back cover of the present invention, Figure 4 Is a conventional back cover configuration diagram illustrating the configuration and operation of the electromagnetic shielding back cover for a video device and a method of manufacturing the same in detail,

First of all, in forming the main body of the back cover, it is possible to increase the strength by simultaneously synthesizing various general polymer materials from the conventional method of producing the back cover by using a metal plate having excellent conductivity, and to function as the appearance of the back cover. The cover is produced, and polystyrene (PS), polyvinyl chloride (PVC), polyethylene (PE), ABS resin, etc. are added in small amounts (g) according to the degree of rolling, and the general vacuum forming method is used. To form a back cover body. In some cases, a conductive material (Mn-Zn-, Ni-Zn-, Mg-Zn-, Mg.Cu-Zn-ferrite, etc.) capable of being added to a synthetic resin may be mixed for vacuum molding and injection molding. .

Next, a process of vacuum depositing a conductive metal material on the back cover body 10 is performed. When vacuum evaporation is easily described, it refers to attaching the vapor to an object surface by heating a metal or nonmetal material in a vacuum. In a container placed in a high vacuum, a particle to be coated and a metal to be attached to the surface are placed, and then the metal particle is evaporated by heating with a current through a heater, and the vaporized metal particle condenses on the surface of the cold object. It can be applied to all articles by attaching the epidermis by attaching them. For example, attaching aluminum to the cloth or silver to the plastic may be considered.

Referring to Figures 2 and 3 to look at the operation sequence in the vacuum coating vapor deposition into the inside of the produced back cover body,

First, a metal is used for deposition on the tungsten filament 4 between the jig 2 and the upper part of the jig formed in the chamber 1 and the product hanger 3 on the jig. After fixing the aluminum, etc.), close the door of the chamber and drive it. The chamber low vacuum valve opens and low vacuum starts and exhausts air to -10 ⁵ . The low vacuum measurement gauge signal activates the medium vacuum pump, and another low vacuum signal completes the low vacuum and closes the valve. The high vacuum auxiliary valve and the high vacuum valve are opened to start high vacuum, and the jig 2 is rotated by the high vacuum gauge signal, and the product starts to rotate slowly. Voltage is applied to the tungsten filament 4, which is the evaporation source by the high vacuum gauge signal, and the aluminum 20 gradually begins to melt, and as the secondary power is applied, the molten aluminum begins to evaporate and rotates. Deposition takes place. The time required for deposition depends on the weight. The heavier the weight, the longer it takes. The maximum time is about 30 minutes and about 25 minutes for steel plates and 25 minutes for plastics.

When the deposition is completed above, the open high vacuum valve is closed and air is injected into the chamber 1 to open the chamber.

In order to increase the efficiency of vacuum deposition, a separate step may be inserted. Before the deposition, the coating is coated on the outside of the back cover by using UV paint on the back cover to enhance adhesion and adhesion during deposition of the deposition material and to make the surface smooth. You can also add BASE COATING process, and TOP COATING process to coat with UV paint once again to protect the deposition surface after deposition or to use other colors.

The back cover, which has been subjected to the above process, is attached to each video device to provide to the consumer.

The back cover of the present invention can be configured by taking advantage of the advantages and disadvantages of the back cover using a conventional metal back cover and synthetic resin mixture.

In other words, the metal back cover is good for preventing electromagnetic waves due to its excellent antistatic and current transfer properties, while the difficulty and cost of the process due to the rigidity of the material are high, and the weight of the entire video equipment is heavy when the back cover is attached. there was. The back cover using synthetic materials such as carbon, which is a conductive material, is better than metal materials in terms of price and weight. However, the conductivity is greatly reduced, and it is easily broken when the component of the conductive material is increased to increase conductivity. There were defects such as high resistance.

Through the electromagnetic wave shielding back cover of the present invention and the manufacturing method of the present invention made of the above-described method and configuration, it is possible to provide a back cover for the video device having a light quality property at a lower unit price, so that the producer can produce and logistically It can reduce the production cost by lowering the cost, and consumers can use the video equipment products at a lower price, and the weight is much lighter, making it easier to move, and also reduce the logistics cost due to the weight during export. It is said that the expected effect is a great invention.

Claims (5)

In the back cover to cover the outside of the screen of the existing video equipment, A process of making a back cover main body using a vacuum molding method for a polymer synthetic resin, Electromagnetic shielding back cover for a video device comprising the step of vacuum depositing a conductive metal material on the outside of the back cover body using a vacuum evaporator and a method of manufacturing the same The method of claim 1, Electromagnetic shielding back cover for a video device comprising the step of applying a base coating to the back cover body between the process of making the backker body and the vacuum deposition process and a manufacturing method thereof The method of claim 1, Electromagnetic shielding back cover for a video device comprising the step of performing a top coating after the vacuum deposition process and a manufacturing method thereof The method of claim 1, Electromagnetic shielding back cover for a video device, and a method of manufacturing the conductive material to be vacuum-deposited is aluminum, nickel, chromium, copper The method of claim 1, Body back cover is an electromagnetic shielding back cover for a video device, characterized in that consisting of a non-conductive material and a method of manufacturing the same