KR101177387B1 - Method of manufacturing dual-type external electrode fluorescent lamp - Google Patents

Abstract

PURPOSE: A dual type external electrode fluorescent lamp and a manufacturing method thereof are provided to secure an external electrode area by including a second glass tube of multi-tube type. CONSTITUTION: A first glass tube(100) and a second glass tube(200) are welded. An end portion(110) of the first glass tube is opened. The diameter(D2) of the opened end portion is expanded larger than the diameter(D1) of a glass tube main body. The second glass tube is formed into a structure in which both end portions(210, 220) are opened. The second glass tube is welded to the opened end portion of the first glass pipe. A first multi-tube is welded to the first glass tube and the second glass tube for electrode area expansion.

Description

Dual type external electrode fluorescent lamp and its manufacturing method {METHOD OF MANUFACTURING DUAL-TYPE EXTERNAL ELECTRODE FLUORESCENT LAMP}

The present invention relates to an external electrode fluorescent lamp (EEFL) and a method of manufacturing the same.

The present invention relates to an external electrode fluorescent lamp (EEFL) and a method of manufacturing the same, and more particularly, by bonding a separate glass tube having a diameter different from the diameter of the lamp to both ends of the electrodeless fluorescent lamp The present invention relates to a method for manufacturing a dual type external electrode fluorescent lamp capable of reducing the overall length of an electrode fluorescent lamp and the length of the external electrode.

A liquid crystal display is a light emitting flat panel display that itself emits light and does not form an image, and is a light receiving flat panel display that receives light from the outside to form an image, thereby observing an image in a dark place. There is a problem that cannot be done.

In connection with the above problem, a backlight is provided on the back of the liquid crystal display to irradiate light so that the image can be viewed even in a dark place. Common specifications required for backlight include high brightness, high efficiency, uniformity of brightness, long life, thinness, low weight and low price.

Conventionally, although a Cold Cathode Fluorescent Lamp (CCFL) has been widely used as the backlight, it has been pointed out as a problem that the lamp operates at high brightness and has a lifetime. In this regard, in recent years, an external electrode fluorescent lamp has been widely used as a backlight.

The external electrode fluorescent lamp encapsulates gas in a sealed glass tube and forms electrodes on both ends of the lamp to perform gas discharge operation without exposing the electrode to the gas discharge space, thereby forming plasma in the lamp by the electric field of the external electrode. It is a fluorescent lamp having a structure. The gas discharge phenomenon inside the tube is the same as that of a normal lamp, but since the glass tube itself acts as a dielectric, the wall gain due to the accumulation of space charges caused by the discharge is added to the external voltage applied to induce the discharge. This will occur.

Unlike ordinary fluorescent lamps such as cold-cathode fluorescent lamps, external electrode fluorescent lamps have electrodes outside the lamp and do not generate heat by using an electron emission method by an electric field, and their lamp life is more than five times longer than ordinary fluorescent lamps. It is about 10 times brighter and next generation lighting lamp with more than 5 times energy efficiency compared to cold cathode fluorescent lamps. In addition, the external electrode fluorescent lamp has a number of advantages, such as being able to drive a plurality of tubes by different driving devices, and is widely used in applications requiring high brightness, such as LCD TVs and billboards.

On the other hand, the tube diameter of the lamp is related to the luminance and the light quantity. The smaller the diameter is, the higher the luminance is but the smaller the light emitting area of the fluorescent lamp is, the smaller the light quantity is. On the other hand, the larger the diameter, the smaller the luminance, but the light emitting area is increased, so that it is applied to a lamp for high power having a large amount of light. Particularly, external electrode fluorescent lamps generally use small tubes having small diameters to obtain high luminance, but the amount of light is small, and the luminance decreases when the diameters are increased to compensate for them.

In addition, as the length and diameter of the entire lamp become larger, the length of the external electrode is also proportionally longer correspondingly to obtain a constant brightness. However, when the length of the external electrode is increased, the effective light emitting surface is reduced, and when the backlight is used, the portion of the external electrode is wide, so that the non-light emitting area where the panel does not emit light becomes large, which is a negative factor in terms of lamp efficiency. .

Therefore, although a long length and a correspondingly large diameter are required according to the use of the external electrode fluorescent lamp, the present situation still remains.

Accordingly, an object of the present invention is to provide an external electrode fluorescent lamp which can reduce the length of an external electrode that can serve as a non-light-emitting region as well as obtain the required luminance when a long external electrode fluorescent lamp is required. It is an object to provide a lamp and a method of manufacturing the same.

As described above, according to the present invention, even when a long external electrode fluorescent lamp is required depending on the use, a separate multi-tubular form in which the external electrode is formed without having to lengthen the external electrode to obtain a desired luminance. By providing a second glass tube and another second glass tube, a desired external electrode area can be secured. Therefore, in the long external electrode fluorescent lamp, the non-light emitting area due to the external electrode can be reduced.

1 is a view schematically showing the structure of a dual type external electrode fluorescent lamp according to an embodiment of the present invention.
2 is a view schematically showing a bonding structure of another second glass tube and the first glass tube provided according to an embodiment of the present invention.

In order to achieve the above object, the present inventors separately provide a glass tube in which the external electrode is formed, unlike the prior art in which the length of the entire external electrode fluorescent lamp is increased accordingly to the use and thus the length of the external electrode is increased. The present invention was completed by making the diameter of the larger than the diameter of the glass tube body coated with the fluorescent material.

In order to achieve the above object, there is provided a method of manufacturing a dual type external electrode fluorescent lamp according to one embodiment of the present invention, i) a method of manufacturing the fluorescent lamp i) both ends are open, the inner wall is not coated with a fluorescent material And providing a first glass tube with an enlarged diameter at the open end, and (ii) two second glass tubes having both ends open and having a diameter larger than that of the first glass tube. Bonding to both open ends of the first glass tube so that the first glass tube and the two second glass tubes communicate with each other; and (iii) coating the phosphor in a state in which the first glass tube and the second glass tube are bonded to each other. (B) removing the phosphor of the second glass tube coated in the coating process in a state in which the first glass tube and the second glass tube are bonded to each other, and (v) the first glass tube and the second glass. Firing the inside of the glass tube in which the two tubes are bonded or left with the phosphor coated; and (vi) inserting and joining a first multi-tube to expand the electrode area to one of the second glass tubes. And inserting and attaching a second multi-pipe equipped with an exhaust port to another electrode of the second glass pipe while increasing an electrode area; and (i) connecting an exhaust system to the exhaust port to connect the inside of the glass tube. Vacuuming and injecting a discharge gas, and then cutting a part of the exhaust port and sealing the part.

The objects, features and advantages of the present invention described above will be more clearly understood through the following detailed description of preferred embodiments of the present invention with reference to the accompanying drawings.

In the following description with reference to the accompanying drawings, in the manufacture of an external electrode fluorescent lamp, a description of the manufacturing process, operations that can be commonly performed, and the configuration or operation of a known device, which are already known in the art, Omit. In addition, although the characteristic configuration of the present invention has been described and illustrated as being applied to an external electrode fluorescent lamp, it will be readily understood by those skilled in the art that the present invention can also be applied to neon signs using glass lamps that are not coated with a fluorescent material.

1 is a view schematically showing the structure of a dual type external electrode fluorescent lamp according to an embodiment of the present invention.

Specifically, (a) of FIG. 1 shows a state before the first glass tube 100 and the second glass tube 200 are bonded and the first multi-tube 300 for expanding the electrode area is bonded, and FIG. 1. (B) shows a state in which the first glass tube 100 and the second glass tube 200 are bonded to each other, and the first multi-tube 300 for expanding the electrode area is bonded. Moreover, it is showing that the both ends of a 1st glass tube are in the state which expanded.

1, only a part of the left side of the dual type external electrode fluorescent lamp of the present invention is shown.

In addition, in order to complete the lamp, the sealing operation should be performed, but various forms are possible, and the detailed description will be omitted in the present invention.

As shown in the figure, the dual type external electrode fluorescent lamp according to an embodiment of the present invention is composed of a first glass tube 100 and a second glass tube 200 to which the multi-tube for electrode is attached to each other, In addition, an external electrode (not shown) is formed on a surface of the second glass tube 200 and an inner wall of the multiple tube added therein, and a discharge gas is contained in the glass tube.

The end portion 110 of the first glass tube is open, and the inner wall of the glass tube is not coated with a fluorescent material. In addition, as shown in the figure, the diameter D2 of the open end 110 is larger than the diameter D1 of the glass tube body. In addition, although not shown in the figure, the diameter of a 1st glass tube is uniform in the whole length is also included in this invention.

The second glass tube 200 has a structure in which both ends 210 and 220 are open, and is joined to the open end 110 of the first glass tube through the one open end 210. On the other hand, as shown in the figure, the diameter (D4) of the second glass tube has a diameter larger than the diameter (D1) of the first glass tube, according to a preferred embodiment of the present invention the one open end 210 is The shaft can be shaped for easy bonding with the open end 110 of the first glass tube.

The diameter D3 of the shaft-shaped open end 210 may be smaller, larger, or the same as the diameter D2 of the open end 110 of the first glass tube 100.

The dual type external electrode fluorescent lamp having the structure as described above provides the second glass tube 200 in which the external electrode is formed separately from the first glass tube 100, and provides the diameter D4 of the diameter of the first glass tube. By making it larger than (D1), when an external electrode fluorescent lamp having a long length is required according to the use, it is possible to secure an area for obtaining a desired luminance without having to lengthen the external electrode correspondingly, so that The light emitting area can be reduced. In addition, the first multi-pipe 300 for electrode area enlargement is bonded to maximize the effect.

Hereinafter, the method of manufacturing the dual type external electrode fluorescent lamp having the configuration as described above will be described in detail.

1. Bonding of the first glass tube 100 and the second glass tube 200

First, as shown in FIG. 1A, a first glass tube 100 for preparing an external electrode fluorescent lamp is prepared, and a fluorescent material is not coated on the inner surface of the glass tube, and both ends 110 are opened. have.

It is preferable that the diameter of both ends is expanded so that it may be larger than the diameter of a glass tube body part. This will be described in more detail below.

Meanwhile, as shown in the drawing, according to one preferred embodiment of the present invention, it is preferable that the entire inner wall of the first glass tube 100 is not coated with a fluorescent material.

Next, the second glass tube 200 to be bonded to the first glass tube 100 is prepared. As shown in the figure, it can be seen that the diameter D4 of the second glass tube 200 is larger than the diameter D1 of the first glass tube 100. That is, depending on the application, a long external electrode fluorescent lamp may be required. When the length and / or diameter of the lamp are increased, the length of the external electrode is also proportionally large to obtain a constant luminance. However, when the length of the external electrode becomes longer, the effective light emitting surface is reduced and the non-light emitting area is increased as a whole of the lamp, thereby decreasing its efficiency.

The present invention does not manufacture an external electrode fluorescent lamp in the form of a single glass tube, but separately prepares and bonds a glass tube on which the external electrode is formed and a glass tube not coated with a fluorescent substance, and bonds the glass tube on which the external electrode is formed. The diameter of the glass tube coated with a fluorescent material is larger than the diameter of the prior art.

Specifically, the diameter D4 of the second glass tube 200 in which the external electrode is formed is prepared to be larger than the diameter D1 of the first glass tube 100 to secure an area of the external electrode portion required according to the application. That is, in a single external electrode fluorescent lamp as in the prior art, as the length increases, the glass tube of the external electrode forming portion of the same diameter is also lengthened, so as not to secure desired luminance and the like, but not to the fluorescent substance coated glass tube 100. Separately from the second glass tube 200 having a diameter larger than that of the glass tube to prepare an external electrode, thereby securing an area for obtaining a desired luminance.

As shown, both ends of the second glass tube 200 are open, and in accordance with a preferred embodiment of the present invention, the open end 210 has a diameter of about 10 to be joined to the open end 110 of the first glass tube. It is reduced.

Subsequently, the first glass tube 100 and the second glass tube 200 are joined to each other, and the open ends 110 and 210 of the two glass tubes are brought into contact with each other, and then the two ends are joined using torch heating or the like.

According to the present invention, in joining the two glass tubes, the two glass tubes can be melted and joined by using a torch while being rotated while being fixed using a predetermined holder (not shown). By joining the two glass tubes in this way, the warping of the glass tube to the depression of the glass tube at the joint portion can be effectively prevented.

In performing the bonding as described above, it is preferable that the diameter of the open end 110 of the uncoated first glass tube 100 be expanded to be larger than the diameter of the first glass tube. That is, as shown in FIG. 1, the diameter D2 of the open end 110 is expanded to be larger than the diameter D1 of the first glass tube. When joining the glass tubes 100 and 200, the glass tubes tend to retract due to high heat. If, due to the high heat, the diameter D2 of the open end 110 is smaller than the diameter D1 of the first glass tube 100, a difference in luminance of the lamp occurs and the electrical resistance increases, and Appearance deteriorates. In view of these points, it is preferable that the open end 110 of the first glass tube 100 has its diameter D2 larger than the diameter D1 of the first glass tube.

On the other hand, according to a preferred embodiment of the present invention, in order to facilitate the bonding of the two glass tubes, the diameter of the open end (110, 210) is processed to be different from each other. At this time, the diameter D1 of the open end 110 of the first glass tube may be larger than the diameter D3 of the open end 210 of the second glass tube, and may be made smaller. Further, according to another embodiment of the present invention, the diameters D2 and D3 of the open ends may be the same. However, the bonding process with the second glass tube 200 may be performed by processing only the open end 110 of the first glass tube 100 without performing any molding on the open end 210 of the second glass tube. Care must be taken. That is, according to the embodiment, if the diameter (D4) of the second glass tube 200 is not significantly larger than the diameter (D1) of the first glass tube, simply by processing only the open end 110 of the first glass tube to the second The joining process can also be carried out by inserting or facing the glass tube. That is, the full-length diameter of a 2nd glass tube may be uniform.

After preparing the first and second glass tubes through the above process, a process of joining the two glass tubes is performed. As shown in FIG. 1, when the diameters of the open ends of the two glass tubes are different, the open ends of the small diameters are different. Is inserted into the open end of the large diameter, then the two open ends are joined through torch heating, and if the two open ends have the same diameter, the two ends are joined together and then the two ends are joined through torch heating.

In addition, the second glass tube is to be configured in the form of a double tube in order to further expand the electrode area. That is, another glass tube 310 having a smaller diameter than the second glass tube is bonded to the first multi-pipe 300 so that an empty space can be formed between the outer diameter and the inner diameter of the second glass tube.

2. Bonding of the first glass tube 100 and another second glass tube 200 '

After completing the process of bonding the second glass tube 200 to one open end 110 of the first glass tube 100 through the series of steps, the second end of the first glass tube 100 A bonding process of the glass tube 200 'is performed.

In this bonding process, an additional process is performed unlike the bonding process described above. That is, in manufacturing an external electrode fluorescent lamp, a process of coating the phosphor on the inner wall of the glass tube which is integrated after the bonding process of the first glass tube and the second glass tube and the phosphor coated on the inner wall of the two parts of the second glass tube. The process of removing and firing the interior of the second glass tube 200 in which the phosphor is already removed on the inner wall of the first glass tube 100 and the phosphor is coated on the inner wall and another glass tube 300 and The process of inserting and joining the glass tube 400 and evacuating the inside of the lamp and injecting an inert gas (discharger body) should be performed.

According to the present invention, a second multi-pipe 400 of novel structure is provided to more easily perform this essential process and the bonding process of a separate glass tube according to the present invention. The second multi-pipe is further provided with an exhaust port 420 for vacuum formation and the injection of gas. In the following description, the part which overlaps with respect to the structure of the 1st and 2nd glass tube mentioned above abbreviate | omits the description.

100: first glass tube 200: second glass tube
200 ': another second glass tube 300: first multi-tube
400: second multi-pipe

Claims (2)

i) providing a first glass tube whose both ends are open and whose inner wall is not coated with a fluorescent material and whose diameter of the open end is enlarged;
(ii) The two glass tubes of both ends which are open at both ends and having a diameter larger than the diameter of the first glass tube are joined to both open ends of the first glass tube so that the first glass tube and the two second glass tubes are joined. To allow them to communicate with each other,
(iii) coating the phosphor with the first glass tube and the second glass tube bonded together;
(Iii) removing the phosphor of the second glass tube coated in the coating process while the first glass tube and the second glass tube are bonded to each other;
(v) firing the inside of the glass tube in which the first glass tube and the second glass tube are bonded to each other, and in which phosphors remain coated or removed;
(vi) inserting and joining a first multi-tube which is intended to enlarge an electrode area to one glass tube of the second glass tube, and an exhaust port at the same time to expand the electrode area to another glass tube of the second glass tube; Inserting and joining the provided second multi-pipe;
(Iiii) connecting the exhaust system to the exhaust port to evacuate the inside of the glass tube, injecting discharge gas, and then cutting a part of the exhaust port and sealing the manufacturing method of the dual type external electrode fluorescent lamp. . An external electrode fluorescent lamp prepared according to claim 1.

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