KR100798676B1 - External electrode fluorescent lamp and method for fabricating the same - Google Patents

Abstract

An external electrode fluorescent lamp and a manufacturing method thereof are provided to implement a large-size glass tube by using a T-like beam, a cup-like bead, and a cylindrical bead. A T-like bead(B) is inserted into a lower portion of a cylindrical glass tube. The lower portion of a glass tube(L) is sealed. A portion of an upper end of the glass tube is heated and pressed to form a holding bump. A bead module is inserted into the upper end of the glass tube. The bead module includes the T-like beads, a partition, and a mercury pellet which is arranged in an inner space formed by the partition. An upper end of the bead module is heated and pressed, and mercury is dispersed inside the glass tube. The glass tube at a lower end of the bead module is heated and pressed to seal the glass tube. Then, the bead module is removed.

Description

External Electrode Fluorescent Lamp and method for fabricating the same

1 is a view for explaining a conventional EEFL.

Figures 2a to 2e is a view for explaining the process of encapsulating both ends of the glass tube used in the conventional manufacturing method of EEFL.

3 is a cross-sectional view illustrating an EEFL according to an embodiment of the present invention.

4A and 4B are cross-sectional views illustrating a bead module used in the EEFL according to an embodiment of the present invention.

5A to 5C are a perspective view, a plan view and a cross-sectional view for explaining another type of bead module used in the EEFL according to an embodiment of the present invention.

6A to 6D are cross-sectional views illustrating a method of manufacturing an EEFL according to an embodiment of the present invention.

7A to 7D are cross-sectional views illustrating a method of manufacturing an EEFL according to another embodiment of the present invention.

8 and 9 are diagrams for explaining the beads used in the EEFL according to an embodiment of the present invention.

(Explanation of symbols for the main parts of the drawing)

L; Glass tube external electrode (e); Jam

BM; Bead Modules B, B ', B ", B1, B2; Bead

H; Hole W; septum

P; Mercury pellets

The present invention relates to an external electrode fluorescent lamp and a method of manufacturing the same, and more particularly, to an external electrode fluorescent lamp capable of using a large glass tube and having improved reliability.

In general, a flat panel display is classified into a self-luminous type and a light receiving type. The self-luminous type includes a flat cathode ray tube, a plasma display panel, an electroluminescent device, a fluorescent display device, a light emitting diode, and the like. The light-receiving type includes a liquid crystal display.

Among them, since the liquid crystal display itself emits light and does not form an image, and light is incident from the outside to form an image, there is a problem in that an image cannot be observed in a dark place.

In order to solve this problem, a backlight is provided on the back of the liquid crystal display to irradiate light. As a result, the image can be seen even in a dark place. Typical requirements for the backlight are high brightness, high efficiency, uniformity of brightness, long life, thinness, low weight and low cost. In the case of notebook PCs, high efficiency long life lamps are required to reduce power consumption, and backlights for monitors and TVs require high brightness.

Background Art As a backlight, a cold cathode fluorescent lamp (CCFL) is disposed and a flat fluorescent lamp is fabricated by assembling upper and lower substrates coated with phosphors. The CCFL can be classified into an edge light method using a light guide plate and a direct light method arranged in a plane according to the arrangement of the light source on the display surface.

However, the CCFL according to the prior art operates at a high brightness of about 30,000 cd / m 2 and the life of the lamp is a problem. In particular, the edge emitting method is CCFL itself emits high luminance, but the panel brightness is low, which is not suitable for large screen panels. In the direct type, CCFLs cannot be connected in parallel to be driven by a single inverter, and the number of CCFLs arranged in a plane is limited for proper brightness of the panel. The thickness of the panel is large because the distance between the diffuser plate and the lamp increases.

Flat fluorescent lamps must have sufficient thickness to prevent breakage of glass substrates because the internal pressure of the upper and lower substrates to be assembled is lower than atmospheric pressure. As a result, the weight is heavy. In addition, in the flat fluorescent lamp method, a bead or cross-shaped spacer and a partition wall are installed between the upper and lower substrates in order to increase the screen area, and there are serious problems of weight according to the thickness of the substrate and generation of heat due to low efficiency. . In the case of using the partition wall, the stripe pattern of the partition wall appears on the screen, so that uniformity of luminance cannot be guaranteed.

Therefore, it is necessary to develop a backlight which can ensure high brightness and high efficiency of liquid crystal displays in a large-scale trend, and at the same time, can lead to long life and light weight.

Due to this development demand, an external electrode fluorescent lamp (EEFL) has recently used a backlight of a liquid crystal display.

Unlike ordinary fluorescent lamps, the EEFL emits light by inducing plasma discharge in the lamp by an electric field applied to the electrode and emits light. Fluorescent lamp.

In addition, EEFL's drive system can drive several lamps in parallel simultaneously, much lower than 1.500V, which reduces power consumption by up to 50% compared to the conventional CCFL method. Is extended.

However, in order to prevent the increase of the driving voltage according to the enlargement of the lamp, it is inevitable to enlarge the external electrode area. However, since the narrow lamp has a limitation, a large diameter EEFL is required.

1 is a view for explaining a conventional EEFL.

Referring to FIG. 1, a conventional EEFL 1 is generally formed by forming an external electrode e in an electrodeless glass tube 1, and in order to manufacture such an EEFL 1, fluorescent light is formed inside the glass tube 1. After applying various materials and filling with inert gas, the both ends of the glass tube (1) should be sealed.

In addition, in order to use the conventional EEFL (1) as a backlight of the liquid crystal display, by placing a plurality of EEFL (1) superimposed, they can be used as a backlight of the liquid crystal display by connecting and driving in parallel.

2A to 2E are views illustrating a process of encapsulating both ends of glass tubes in a conventional method of manufacturing EEFL.

Referring to Figure 2a, first, the glass tube (1) of the upper and lower ends are prepared.

Then, one end, for example, the lower end of the glass tube 1 is heated with a torch or the like and pressurized.

Referring to FIG. 2B, a predetermined first bead locking jaw (external electrode e) is formed at the other end of the glass tube l, for example, at a point in the upper direction by simultaneously heating and pressing again. 1 Insert the bead b1.

Then, the glass tube l on the upper side of the first bead b1 is heated and pressurized again to form a pellet catching jaw l2 capable of fixing the mercury pellets (p, pellet), and the mercury pellet (p) Insert it.

After the mercury pellet (p) is inserted, the glass tube (1) above the mercury pellet (p) is heated and pressed again to form a second bead locking jaw (l3), and the second bead (b2) is inserted. .

Referring to Figure 2c, after inserting the second bead (b2), the lower end of the sealed tube (1) is converted to a vacuum state and inert gas is injected.

Referring to FIG. 2D, after the gas is injected, the top of the second bead of the glass tube 1 is heated and pressurized and sealed, and the mercury in the mercury pellet p is applied by applying ultrasonic waves to the mercury pellet p. Diffusion into the glass tube (1).

Referring to FIG. 2E, after the mercury is diffused, the upper surface of the first bead b1 is heated and pressurized to encapsulate the glass tube 1, and the second bead b2 and the mercury pellet p are removed. do.

However, the conventional EEFL as described above, in the recent trend of larger size, as the diameter of the glass tube 1 is increased, in particular, it is difficult to produce spherical beads suitable for large diameters of 8 mm or more. To smash.

In addition, the conventional EEFL has a critical defect in the reliability of the EEFL (1) due to the residual thermal stress caused by the use of large beads during heating and pressurization for the sealing of the glass tube (1). This residual thermal stress is a major cause of pinholes and cracks in the glass tube.

In addition, in the case of using a large cylindrical bead, the speed at which the glass tube of the EEFL liquefied by the air pressure difference sinks into the EEFL is faster than the speed at which the inside of the cylinder is filled by the glass tube (1) of the liquefied EEFL. It may be the cause of the failure.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide an external electrode fluorescent lamp capable of using a large glass tube and having improved reliability, and a method of manufacturing the same.

An external electrode fluorescent lamp of the present invention for achieving the above object comprises a cylindrical glass tube sealed by coating a fluorescent material on the inner surface; Located at any one of the upper and lower ends of the glass tube is provided with a T-shaped bead coupled to the inner surface of the glass tube to seal the glass tube.

The "-" portion of the T-shaped bead remains approximately hemispherical or planar, and " | " The part may be in the form of a cylinder or a round tube.

The T-shaped beads may be replaced with cup beads or cylindrical beads.

In addition, the manufacturing method of the external electrode fluorescent lamp of the present invention comprises the steps of inserting a T-shaped bead into the lower end of the cylindrical glass tube, and sealing the lower end of the glass tube in which the T-shaped beads are inserted; Heating and pressing a portion of the upper end of the glass tube to form a locking step; A bead module connecting T-shaped beads to the upper and lower portions, a partition wall connecting the upper and lower T-shaped beads to insulate the interior space from the outside, and a mercury pellet located in the interior space formed by the partition wall. Inserting through an upper end of the glass tube; Heating and pressurizing an upper end of the bead module to seal and diffusing mercury into the glass tube; And sealing and heating the glass tube at the bottom of the bead module, and removing the bead module.

The T-shaped bead has a hemispherical shape in the "-" part, the diameter of which matches the outer diameter of the glass tube, and the "|" The part may be in the form of a cylinder or a round tube.

The T-shaped beads may be replaced with cup beads or cylindrical beads.

The bead module generally has a cylindrical shape, a T-shaped bead in the upper and lower portions, a partition wall connecting the upper and lower T-shaped beads, and separating an inner space from the outside, and an inner space formed by the partition wall. Mercury pellets located in the at least one of the upper and lower T-shaped beads of the bead module is preferably provided with a hole that serves as a passage connecting the internal space formed by the partition wall and the external environment.

The step of encapsulating the upper end of the bead module by heating, pressurizing, and the step of diffusing mercury in the glass tube, when both the upper and lower T-shaped beads of the bead module is formed, the sealing of the glass tube is the upper T A first encapsulation step of being in close contact with the upper surface of the shaped beads; Converting the inside of the glass tube into a vacuum state by discharging the gas inside the glass tube to the outside through the holes of the upper and lower T-shaped beads; Injecting an inert gas through the holes of the upper and lower T-shaped beads; And a second encapsulation step of encapsulating the holes of the upper T-shaped beads.

The step of encapsulating the upper end of the bead module by heating, pressurizing, and the step of diffusing mercury in the glass tube is any one of the upper and lower T-shaped beads of the bead module, for example, only the lower T-shaped beads A primary encapsulation step, if so formed, such that only a portion of the “-” portion of the glass tube inner surface and the upper T-shaped bead is joined; Discharging the gas inside the glass tube to the outside through an unbonded portion of the inner surface of the glass tube and the T-shaped beads to convert the inside of the glass tube into a vacuum state; Injecting an inert gas after changing the inside of the glass tube into a vacuum state; And a secondary encapsulation step for engaging the entirety of the "-" portion of the glass tube inner surface and the upper T-shaped beads.

The bead module has a cylindrical shape as a whole, and has a groove formed on the circumference along its length direction, and connects the T-shaped beads to the upper and lower portions and the upper and lower T-shaped beads, and the inner space is externally formed. And a partition wall to separate the mercury pellets from the inner space formed by the partition wall, wherein the partition wall of the groove of the bead module serves as a passage connecting the inner space formed by the partition wall and the external environment. It is provided.

In addition, the manufacturing method of the external electrode fluorescent lamp of the present invention comprises the steps of inserting the T-shaped beads to the lower end of the cylindrical glass tube, and enclosing the upper end of the glass tube in which the T-shaped beads are inserted; A bead module connecting T-shaped beads to the upper and lower portions, a partition wall connecting the upper and lower T-shaped beads to insulate the interior space from the outside, and a mercury pellet located in the interior space formed by the partition wall. Inserting through a lower end of the glass tube; Heating and pressing a lower end of the bead module and encapsulating the diffused mercury in the glass tube; And sealing and heating the glass tube on the upper end of the bead module, and removing the bead module.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Like numbers refer to like elements throughout.

3 is a cross-sectional view illustrating an EEFL according to an embodiment of the present invention.

Referring to Figure 3, the EEFL according to an embodiment of the present invention is a usable EEFL of a large glass tube of 8mm or more in diameter, one of the upper and lower, for example, the lower part is sealed through the T-shaped beads (B). In addition, a fluorescent material (not shown in the drawing) is coated on the inner surface, and includes a sealed cylindrical glass tube L and external electrodes connected to the upper and lower portions of the glass tube L (not shown). . Of course, it is obvious that the inert gas is filled in the glass tube L.

In this case, the inert gas generally consists of a gas in which neon (Ne) and argon (Ar) are mixed in a predetermined ratio.

4A and 4B are cross-sectional views illustrating a bead module used in an EEFL according to an embodiment of the present invention.

4A and 4B, the bead module BM used in the EEFL of the embodiment of the present invention has a generally cylindrical shape, and the upper and lower T-shaped beads B1 and B2 and the upper and lower portions are shown. The lower T-shaped beads B1 and B2 are connected to each other, and include a partition wall W that isolates the internal space from the outside, and a mercury pellet P positioned in the internal space formed by the partition wall W. At this time, the "-" portion of the T-shaped beads (B1, B2) is maintained in a substantially hemispherical or flat (not shown in the figure) form, "|" The part consists of a cylinder or a circular tube (not shown in the figure).

In addition, at least one of the upper and lower T-shaped beads B1 and B2 is provided with a hole H serving as a passage connecting the internal space formed by the partition wall W and the external environment.

5A to 5C are a perspective view, a plan view, and a cross-sectional view for explaining another type of bead module used in the EEFL according to an embodiment of the present invention.

5A to 5C, the bead module BM of another type used in the EEFL of the embodiment of the present invention has a generally cylindrical shape and has a predetermined groove G on the circumference along its length. It is a form. The bead module BM connects the T-shaped beads B1 and B2 to the upper and lower portions and the upper and lower T-shaped beads B1 and B2 similarly to the bead modules illustrated in FIGS. 4A and 4B. And a partition wall (W) separating the internal space from the outside, and a mercury pellet (P) located in the internal space formed by the partition wall (W). At this time, the "-" portion of the T-shaped beads (B1, B2) is maintained in a substantially hemispherical or flat (not shown in the figure) form, "|" The part consists of a cylinder or a circular tube (not shown in the figure).

In addition, the bead module (BM) of another type used in the EEFL of the embodiment of the present invention and the internal space formed by the partition wall (W) through the hole (H) formed through the partition wall (W) of the groove (G); Connect the external environment.

6A to 6E are cross-sectional views illustrating a method of manufacturing an EEFL according to an embodiment of the present invention.

Referring to Figure 6a, first, the glass tube (L) of the upper and lower ends are prepared.

Then, the T-shaped bead B is inserted into one of the upper and lower portions of the glass tube L, for example, the lower end.

At this time, the "-" portion of the T-shaped beads (B) is maintained in a substantially hemispherical or planar shape, "|" The part is in the form of a cylinder or a round tube.

In addition, the T-shaped beads (B) are inserted in an inverted T-shape, and the diameter of the "-" portion of the T is preferably identical to the outer diameter of the glass tube (L).

After inserting the T-shaped beads (B) into the lower end of the glass tube (L), the lower end of the glass tube (L) is heated by a torch or the like, pressurized and sealed. At this time, the temperature of the heat to be applied is preferably about 300 ℃ so that the deformation of the glass tube (L).

Referring to FIG. 6B, after inserting the T-shaped beads B to enclose the lower end of the glass tube L, the other end of the glass tube L, for example, a point in the upper direction, is heated and pressed again. Thus, a predetermined locking step L1 is formed. Of course, it is obvious that the heating and pressing time is shorter than the heating and pressing time for enclosing the glass tube (L).

After forming the locking step (L1), through the upper end of the glass tube (L), the bead module (BM) as shown in Figure 4 is inserted. The bead module BM is located at the upper end of the glass tube L than the locking step L1 by the locking step L1.

Referring to FIG. 6C, after inserting the bead module BM, the glass tube L at the upper end of the bead module BM is heated and pressurized to seal the upper portion of the glass tube L.

First, after discharging the gas inside the glass tube L to convert it into a vacuum state, an inert gas is injected into the glass tube L.

At this time, the sealing of the glass tube (L), the vacuum conversion and the injection of the inert gas may vary depending on the type of the bead module (BM).

In more detail, when the holes H are formed in both the upper and lower T-shaped beads B1 and B2 of the bead module BM, the sealing of the glass tube L is performed by the upper T-shaped bead B1. The primary seal is to be in close contact with the upper surface of the. Then, the gas inside the glass tube L is discharged to the outside through the holes H of the upper and lower T-shaped beads B1 and B2 to convert the inside of the glass tube L into a vacuum state. After changing the inside of the glass tube L to a vacuum state, an inert gas is injected through the holes of the upper and lower T-shaped beads B1 and B2. Then, through the secondary sealing to the hole (H) of the upper T-shaped beads (B1).

Further, when only one of the upper and lower T-shaped beads B1 and B2 of the bead module BM, for example, the lower T-shaped bead B2 is formed with the hole H, the glass tube ( L) Primary encapsulation so that only a portion of the inner surface and the "-" portion of the upper T-shaped bead B1 is engaged. At this time, the unconnected portion of the inner surface of the glass tube (L) and the upper T-shaped beads (B1) converts the glass tube (L) into a vacuum state, and serves as a path for injecting inert gas. Then, the gas inside the glass tube L is discharged to the outside, thereby converting the glass tube L inside into a vacuum state. After changing the inside of the glass tube L to a vacuum state, an inert gas is injected. Then, through the second encapsulation to the entire surface of the "-" portion of the inner surface of the glass tube (L) and the upper T-shaped beads (B1).

After enclosing the glass tube L on the top of the bead module BM, ultrasonic waves are applied to the bead module BM to diffuse mercury contained in the mercury pellet P into the glass tube L. At this time, the diffusion of mercury is made through the hole (H) formed in the lower T-shaped beads (B2) of the bead module (BM).

Referring to FIG. 6D, after the mercury is diffused, the glass tube L is sealed by heating and pressing the upper end of the lower T-shaped bead B2 of the bead module BM.

In more detail, by heating the upper end of the lower T-shaped beads (B2) of the bead module (BM), the upper T-shaped beads (B1) and mercury pellets (P) are removed, the glass tube (L) is The upper surface of the lower T-shaped beads (B2) is to be bonded. Therefore, the glass tube L is sealed.

7A to 7E are cross-sectional views illustrating a method of manufacturing an EEFL according to another embodiment of the present invention.

Referring to FIG. 7A, a glass tube L having an open top and bottom is prepared, and a T-shaped bead B is inserted into any one of the top and bottom of the glass tube L, for example, the top. do.

After inserting the T-shaped beads (B) into the upper end of the glass tube (L), the upper end of the glass tube (L) is heated by a torch or the like, pressurized and sealed.

Referring to FIG. 7B, after inserting the T-shaped beads B to seal the upper end of the glass tube L, the other end of the glass tube L, for example, as shown in FIG. Insert the bead module (BM). At this time, the diameter of the bead module (BM), that is, the diameter of the "-" portion of the upper and lower T-shaped beads (B1, B2) of the bead module (BM) matches the diameter of the inner surface of the glass tube (L) It is desirable to.

Then, the gas inside the glass tube L is discharged and converted into a vacuum state through the holes H formed in the upper and lower T-shaped beads B1 and B2 of the bead module BM. Inject gas.

Referring to FIG. 7C, after the inert gas is sealed, the glass tube L at the lower end of the bead module BM is firstly sealed. At this time, the primary encapsulation is preferably encapsulated so that the inner surface of the glass tube (L) can cover the hole (H) of the lower T-shaped beads (B2) of the bead module (BM).

Then, ultrasonic waves are applied to the mercury pellets P of the bead module BM to diffuse the mercury contained in the mercury pellets P into the glass tube L.

Referring to FIG. 7D, after the mercury is diffused, the glass tube L is sealed by heating and pressing the lower end of the upper T-shaped bead B1 of the bead module BM.

In more detail, by heating the upper end of the upper T-shaped beads (B1) of the bead module (BM), the lower T-shaped beads (B2) and mercury pellets (P) are removed, the glass tube (L) is The lower surface of the upper T-shaped beads (B1) are to be bonded. Therefore, the glass tube L is sealed.

In the above, T-shaped beads are described as examples of the beads used in the present invention. However, the present invention is not limited to the T-shaped beads in the shape of the beads, and beads of various shapes can be used. For example, a cup-shaped bead B 'as shown in FIG. 8 may be used, and a cylindrical bead B "as shown in FIG. 9 may also be used.

In detail, in the case of the cup-shaped bead B ', as shown in FIG. 8, the shape of the portion of the upper and lower portions of the glass tube L that is coupled with the cup-shaped bead B' is the cup-shaped bead B '. It corresponds to the shape of '), through which is combined with the cup-shaped beads (B') to enclose the glass tube (L).

In addition, in the case of the cylindrical bead (B "), as shown in Figure 9, the diameter of the cylindrical bead (B") is similar to the inner diameter of the glass tube (L), but slightly smaller. The cylindrical bead B ″ is inserted into the glass tube L through an external device, and its position is fixed. The bead B ″ is coupled to and encapsulated with the glass tube L by heating.

As described above, the EEFL according to the embodiment of the present invention can be applied without difficulty even if the diameter of the glass tube is enlarged by using a T-shaped bead, a cup bead, a cylindrical bead, and a bead module.

In addition, the process can be simplified by reducing the number of steps of heating and pressurizing, and forming the locking step as compared with the conventional method for inserting the spherical beads.

As described above, according to the present invention, it is possible to use a large glass tube, and to provide an external electrode fluorescent lamp having improved reliability and a method of manufacturing the same.

While the foregoing has been described with reference to preferred embodiments of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. I can understand that you can.

Claims (19)

delete delete delete Inserting a T-shaped bead into the lower end of the cylindrical glass tube and enclosing the lower end of the glass tube into which the T-shaped bead is inserted; Heating and pressing a portion of the upper end of the glass tube to form a locking step; A bead module connecting T-shaped beads to the upper and lower portions, a partition wall connecting the upper and lower T-shaped beads to insulate the interior space from the outside, and a mercury pellet located in the interior space formed by the partition wall. Inserting through an upper end of the glass tube; Heating and pressurizing an upper end of the bead module to seal and diffusing mercury into the glass tube; And heating and pressurizing and encapsulating the glass tube at the bottom of the bead module, and removing the bead module. The method of claim 4, wherein T-shaped bead inserted into the bottom of the glass tube The "-" part is hemispherical in shape, the diameter of which corresponds to the outer diameter of the glass tube, "|" A part is a manufacturing method of the external electrode fluorescent lamp characterized by consisting of a cylinder or a round tube form. The method of claim 4, wherein T-shaped bead inserted into the bottom of the glass tube manufacturing method of the external electrode fluorescent lamp, characterized in that can be replaced by cup beads or cylindrical beads. The method of claim 4, wherein The bead module has a cylindrical shape as a whole, T-shaped beads on the top and bottom, A partition wall connecting the upper and lower T-shaped beads to insulate the interior space from the outside; And a mercury pellet located in an inner space formed by the partition wall. The method of claim 7, wherein At least one of the upper and lower T-shaped beads of the bead module has a hole serving as a passage connecting the internal space formed by the partition and the external environment, characterized in that the manufacturing method of the external electrode fluorescent lamp. The method of claim 8, The step of heating and pressing the upper end of the bead module is sealed, and the step of diffusing mercury in the glass tube In the case where holes are formed in both the upper and lower T-shaped beads of the bead module, A first encapsulation step of encapsulating the glass tube so as to be in close contact with an upper surface of the upper T-shaped bead; Converting the inside of the glass tube into a vacuum state by discharging the gas inside the glass tube to the outside through the holes of the upper and lower T-shaped beads; Injecting an inert gas through the holes of the upper and lower T-shaped beads; And a second encapsulation step of encapsulating the hole of the upper T-shaped bead. The method of claim 8, The step of heating and pressing the upper end of the bead module is sealed, and the step of diffusing mercury in the glass tube When only one of the upper and lower T-shaped beads and the lower T-shaped beads of the bead module is formed, A first encapsulation step of allowing only a portion of the “-” portion of the glass tube inner surface and the upper T-shaped bead to couple; Discharging the gas inside the glass tube to the outside through an unbonded portion of the inner surface of the glass tube and the T-shaped beads to convert the inside of the glass tube into a vacuum state; Injecting an inert gas after changing the inside of the glass tube into a vacuum state; And a second encapsulation step of joining the entire inner surface of the glass tube and the "-" portion of the upper T-shaped bead. The method of claim 4, wherein The bead module has a cylindrical shape as a whole, and has a groove formed on the circumference along its length direction, T-shaped beads on the top and bottom, A partition wall connecting the upper and lower T-shaped beads to insulate the interior space from the outside; And a mercury pellet located in an inner space formed by the partition wall. The method of claim 11, The partition wall of the groove of the bead module is a manufacturing method of the external electrode fluorescent lamp, characterized in that it comprises a hole that serves as a passage connecting the internal space formed by the partition wall and the external environment. Inserting a T-shaped bead into a lower end of the cylindrical glass tube and enclosing an upper end of the glass tube into which the T-shaped bead is inserted; A bead module connecting T-shaped beads to the upper and lower portions, a partition wall connecting the upper and lower T-shaped beads to insulate the interior space from the outside, and a mercury pellet located in the interior space formed by the partition wall. Inserting through a lower end of the glass tube; Heating and pressing a lower end of the bead module and encapsulating the diffused mercury in the glass tube; And heating and pressurizing and encapsulating the glass tube on the upper end of the bead module, and removing the bead module. The method of claim 13, The bead module T-shaped beads on the top and bottom, A partition wall connecting the upper and lower T-shaped beads to insulate the interior space from the outside; And a mercury pellet located in an inner space formed by the partition wall. The method of claim 14, At least one of the upper and lower T-shaped beads of the bead module has a hole serving as a passage connecting the internal space formed by the partition and the external environment, characterized in that the manufacturing method of the external electrode fluorescent lamp. The method of claim 13, The bead module has a cylindrical shape as a whole, and has a groove formed on the circumference along its length direction, T-shaped beads on the top and bottom, A partition wall connecting the upper and lower T-shaped beads to insulate the interior space from the outside; And a mercury pellet located in an inner space formed by the partition wall. The method of claim 16, The partition wall of the groove of the bead module is a manufacturing method of the external electrode fluorescent lamp, characterized in that it comprises a hole that serves as a passage connecting the internal space formed by the partition wall and the external environment. The method of claim 13, T-shaped bead inserted into the bottom of the glass tube manufacturing method of the external electrode fluorescent lamp, characterized in that can be replaced by cup beads or cylindrical beads. The method of claim 13, The step of heating and pressing the upper end of the bead module is sealed, and the step of diffusing mercury in the glass tube A first encapsulation step of encapsulating the glass tube so as to be in close contact with an upper surface of the upper T-shaped bead; Converting the inside of the glass tube into a vacuum state by discharging the gas inside the glass tube to the outside through the holes of the upper and lower T-shaped beads; Injecting an inert gas through the holes of the upper and lower T-shaped beads; And a second encapsulation step of encapsulating the hole of the upper T-shaped bead.

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