KR100625854B1 - Method for sealing and exhausting flat fluorescent lamp and the lamp made by the method - Google Patents

Abstract

The present invention relates to a device for sealing and evacuating a flat fluorescent lamp, and a method and a flat fluorescent lamp manufactured by the method. Particularly, the present invention relates to sealing and exhausting at a relatively low temperature, and has an exhaust port 12a therein. An upper chamber 20 on which a flat fluorescent lamp 10 is placed, an outer heater 21 attached to an upper side, and a connector 22 formed on a lower side thereof; An exhaust duct 30 connected to the connector 22 of the upper chamber 20 and provided with vacuum pumps 31 and 32 and a gas injection part 33; A shanghai conveying device (40) configured under the connector (22) of the exhaust duct (30), on which a substrate (14) covering the exhaust port (12a) is placed; An internal heater 50 installed above the shanghai conveying apparatus 40; By including the temperature sensor 51 installed on one side of the internal heater 50, deterioration of the phosphor is reduced compared to the conventional method, the brightness is excellent, the degree of vacuum is excellent, the process is simple, the thickness is It is possible to manufacture a thinner flat fluorescent lamp.

Fluorescent lamp, vacuum exhaust, exhaust vent.

Description

Method for sealing and exhausting flat fluorescent lamps, and flat fluorescent lamps manufactured by the method {Method for sealing and exhausting flat fluorescent lamp and the lamp made by the method}

1 is a cross-sectional view showing an example of a conventional flat fluorescent lamp;

2 is an exploded perspective view showing an example of a conventional flat fluorescent lamp;

Figure 3 is an embodiment of the sealing and exhaust method of the conventional flat fluorescent lamp

       Indicating schematic,

Figure 4 is another embodiment of the sealing and exhaust method of the conventional flat fluorescent lamp

       Indicating schematic,

5 and 6 is a sealing and exhaust device of the flat fluorescent lamp of the present invention

       A schematic representation of one embodiment,

7 is produced by the sealing and exhaust device of the flat fluorescent lamp of the present invention

       Side view showing an example of a flat fluorescent lamp,

8 is a step showing the sealing and exhaust method of the flat fluorescent lamp of the present invention,

9 and 10 respectively show an embodiment of the substrate of the flat fluorescent lamp of the present invention.

       Indicating schematic,

11 shows a flat fluorescent lamp manufactured by the method of the present invention.

       Cross-section.

<Explanation of symbols for the main parts of the drawings>

10 fluorescent lamp 12a exhaust port

14 substrate 20 upper chamber

22: connector 30: exhaust duct

40: Shanghai transport device 50: internal heater

60: lower chamber

The present invention relates to a device for sealing and evacuating a flat fluorescent lamp, and a method and a flat fluorescent lamp manufactured by the method. Particularly, the present invention relates to sealing and evacuating at a relatively low temperature. Sealing and evacuation apparatus for flat fluorescent lamps capable of producing flat fluorescent lamps with excellent brightness, excellent vacuum, simple process, and thinner thickness, and the method and flat plates produced by the method It relates to a fluorescent lamp.

A flat fluorescent lamp is used for background lighting of a flat panel display panel. A typical flat fluorescent lamp is a flat windshield 1 having a fluorescent layer 2 disposed on a lower side thereof, as shown in FIGS. 1 and 2. ), A rear glass 3 having a fluorescent layer 4, a dielectric layer 5, and an electrode portion 6 on the upper side thereof, and the edges and airtightness of the front glass 1 and the rear glass 3, respectively. It consists of a support 7 fixed with glass solder for holding, and a plurality of spacers (not shown) provided for supporting the windshield 1 and the rear glass 3.

To date, in the manufacture of flat fluorescent lamps, the front glass 1, the rear glass 3 and the support 7 are attached, and the lamp comprising the front glass 1, the rear glass 3 and the support 7 Vacuum mounting technology for evacuating and rejoining the inner space of the vacuum is basically used.

One example of such a vacuum mounting technique is to use a technique used for a plasma display panel (PDP), which is an exhaust pipe for evacuation in the hole 3a of the rear glass 3, as shown in FIG. (8) is planted and the exhaust pipe (8) is drained by vacuum equipment to exhaust the gas, and the gas is injected through this, and the exhaust pipe (8) is cut and sealed.

However, such a method is difficult to apply because there is a part left after cutting the exhaust pipe 8 although the thickness of the lamp should be thin. In addition, when using this method, since the exhaust pipe 8 must be sealed while melting in a solid or liquid state, there may be a problem in the degree of vacuum due to the exhaust gas.

Another example of the vacuum mounting technique is the technique of H Company of Japan, which is a hole in the side of the support 7 for supporting the windshield 1 and the rear glass 3, as shown in FIG. (7a) and the exhaust part 9 are formed, and after exhausting using this exhaust part 9, the method of injecting a gas and sealing is used. This method also has a complicated process at the time of manufacture, and gas The disadvantage is that there are many losses.

On the other hand, Osram does not use a hole, but exhausts between the support glass 7 of the front glass 1 and the rear glass 3, and then inserts and seals the gas. It has the advantage of being.

However, this method requires expensive equipment because the process is complicated, gas loss is required, and the windshield and rear glass must be precisely aligned. In addition, since the temperature of the material used for sealing the front glass and the rear glass is required to be 400 ℃ or more, there was a problem that the degradation of the phosphor occurs.

The present invention is to solve the above-mentioned shortcomings, the deterioration of the phosphor is reduced compared to the conventional method is excellent in brightness, excellent vacuum degree, simple process, it is possible to manufacture a thinner flat fluorescent lamp A sealing and exhaust device for a flat fluorescent lamp, a method thereof, and a flat fluorescent lamp manufactured by the method are provided.

The present invention, the flat chamber fluorescent lamp is placed on the inside, the upper side is attached to the outer heater, the lower side upper chamber is formed with a connector; An exhaust duct connected to the connection port of the upper chamber and provided with a vacuum pump and a gas injection unit; A shanghai conveying apparatus configured under the connector of the exhaust duct; An internal heater installed above the shanghai conveying apparatus; It is achieved by including a temperature sensor installed on one side of the internal heater.

As another aspect of the present invention, the present invention, in the sealing and exhaust method of the flat fluorescent lamp in which at least one or more exhaust port is formed in the rear glass, using a silicon-based bonding material, the surrounding of the exhaust port or the exhaust port A first step of printing on the substrate to be covered by a screen or a discharge method; A second step of removing impurities by heating to 50 to 150 ° C; Performing a vacuum evacuation at 250 to 300 ° C. with the substrate positioned at the exhaust port side; A fourth step of filling an inert gas into the fluorescent lamp; And a fifth step of baking and curing the substrate at a temperature of 150 to 250 ° C. after applying pressure to the exhaust port side.

An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

5 and 6 are schematic views showing an embodiment of the sealing and exhaust device of the flat fluorescent lamp of the present invention, Figure 7 is a flat fluorescent lamp manufactured by the sealing and exhaust device of the flat fluorescent lamp of the present invention. As a side view showing an example of the present invention, in the present invention, a flat fluorescent lamp 10 having an exhaust port 12a is placed inside, an external heater 21 is attached to an upper side thereof, and a connector 22 is provided on a lower side thereof. An upper chamber 20 formed; An exhaust duct 30 connected to the connector 22 of the upper chamber 20 and provided with vacuum pumps 31 and 32 and a gas injection part 33; A shanghai conveying device (40) configured under the connector (22) of the exhaust duct (30), on which a substrate (14) covering the exhaust port (12a) is placed; An internal heater 50 installed above the shanghai conveying apparatus 40; It is characterized in that it comprises a temperature sensor 51 installed on one side of the inner heater (50).

As shown in FIG. 5, a lower chamber 60 formed in a structure surrounding the exhaust duct 30 is further provided below the upper chamber 20 to stabilize the sealing and the overall structure. .

In addition, the vacuum pumps (31, 32), and a rotary pump (31) for low vacuum; It is preferred to use a turbo pump or cryopump 32 for high vacuum, but in some cases any other type of vacuum pump may be used.

8 is a step diagram showing a method of using the sealing and exhaust device of the flat fluorescent lamp of the present invention. Referring to FIG. 5, the method of using the device of the present invention will be described below.

The present invention relates to a method of sealing and evacuating a plate-shaped fluorescent lamp 10 formed in the rear glass 12 or having a flat fluorescent lamp 10 formed during the process, after being located in the encapsulation and exhaust device. First, in the state in which the exhaust port 12a of the fluorescent lamp 10 is disposed on the connector 22 side in the upper chamber 20, the exhaust port 12a is formed by using a silicon-based bonding material 15. The first step (S10) of printing in a screen or discharge method on the periphery 14) or the substrate 14 covering the exhaust port 12a is performed.

At this time, the substrate 14 is removed from the external heat source at 50 ~ 150 ℃ and placed on the inner heater 50 on the shanghai transport device 40, or the substrate (14) 40) A second step S20 of removing impurities at 50 to 150 ° C. using the internal heater 50 is performed after placing it on the internal heater 50.

Subsequently, a third step S30 of removing impurities from the inside of the panel by performing vacuum evacuation at 250 to 300 ° C. by applying heat from the external heater 21 is performed. At this time, the vacuum pumps 31 and 32 for low and high vacuum are operated together.

Thereafter, a fourth step S40 of filling the inert gas into the fluorescent lamp 10 by using the gas injection part 33 is performed.

Then, the substrate 14 is raised using the shanghai conveying apparatus 40, the pressure is applied to the exhaust port 12a side of the substrate 14, and then the internal heater 50 is operated to operate 150 to 250. It is to perform a fifth step (S50) for firing and curing at a temperature of ℃.

The exhaust port 12a is made of 1 to 4 in the rear glass 12, the size is preferably made of 1mm ~ 5mm in diameter, the substrate 14 covering the exhaust port 12a is glass or soda It is made of lime glass, the diameter of which is preferably made of 10mm ~ 30mm.

In addition, as shown in FIGS. 9 and 10, the substrate 14 may have various shapes such as a circle and a square.

Hereinafter, the operation and effects of the present invention will be described with reference to FIGS. 5 to 10.

The present invention provides a technique for low temperature sealing the windshield 11 and the support 13, the rear glass 12 and the support 13 using a silicone resin, and vacuum high temperature through the exhaust port 12a using the same material. After exhausting and injecting gas, it relates to an apparatus and a method for joining the exhaust port 12a using the substrate 14.

In order to achieve the above object, the flat fluorescent lamp 10 according to the present invention is configured by arranging the phosphor layer 16 on the front glass 11, the rear glass 12 has a white reflector plate 17 After coating, the needle electrode 19 is planarly disposed thereon, the dielectric layer 18 is applied thereon for insulation between the electrodes, and the rear phosphor layer 16 is disposed on the dielectric layer 18.

The windshield 11 and the rear glass 12 are bonded to each other with the support 13 interposed therebetween, and at this time, an exhaust port 12a is installed in the support 13 so that the support 13 and the windshield 11 and An inert gas is filled in the discharge space surrounded by the rear glass 12 and then heated and encapsulated.

As a result, the phosphor layer 16 is disposed on both surfaces of the front glass 11 and the rear glass 12 while the electrode 19 is disposed in a plane, and thus the luminance uniformity is improved while the needle electrode 19 is used. By doing so, it is possible to provide a flat fluorescent lamp with reduced lighting voltage and power consumption.

In the sealing method, the liquid or solid silicon material (Si-OC) is discharged at regular intervals at each of the lower and upper ends of the support 13 using an ejector or a device that plays the same role, and then printed. Heat is applied at about 50 ° C. to 150 ° C. to remove impurities remaining in the material.

At this time, it is also possible to change the process sequence, that is, to bond the silicon material to the rear glass 12 of the front glass 11 without using the silicone resin directly bonded to the support 13 using an ejector.

As such, the positions of the support 13, the windshield 11, and the rear glass 12 prepared in advance are precisely adjusted and pressure is applied using a constant bonding strength, and the temperature is 150 ° C to 250 ° C, preferably 200 ° C to 220 ° C. Harden with At this time, what is important is the temperature of curing at which curing impurities can be completely removed.

This sealing method is lower than the conventional method, that is, about 200 ° C. or lower than the conventional method, and takes less time than the method of heating and sealing the glass at a high temperature. Since only temperature control is required, simple fabrication can be achieved.

In addition, there was almost no deterioration at high temperature of the phosphor due to low temperature sealing. Currently, blue phosphors of PD or three-wavelength phosphors are known to be degraded not only by firing the phosphors but also by the high temperature of the sealing.

To this end, the atmosphere is fired in a neon or argon atmosphere rather than a general atmosphere, or a method of preventing heat damage by a coating method is adopted.

Since the flat fluorescent lamp produced by the low temperature sealing method can be sealed at 250 ° C. or less, which is a range in which the blue phosphor does not deteriorate, deterioration due to such sealing hardly occurs. Alternatively, the degradation of green and red phosphors is not limited to blue, and the same explanation can be seen that deterioration is prevented.

The same effect can be explained by reducing the deterioration of the blue phosphor and reducing the amount of blue light and adding more green and red to reproduce white by mixing green, red and blue in a flat fluorescent lamp. Therefore, the effect of increasing the luminance can be obtained.

Thereafter, the manufactured flat fluorescent lamp 10 is charged into the sealing and evacuating apparatus of the present invention, vacuum evacuation, and after gas injection, the sealing is performed.

After the vacuum exhaust, sealing is performed using the same silicone resin (Si-O-C) material as the sealing material described above. The exhaust port 12a is formed in advance in the flat fluorescent lamp 10 in which the windshield 11, the rear glass 12, and the support 13, which are manufactured by the method described above, are bonded to each other via a silicone resin. Alternatively, in the state where the exhaust port 12a is formed in the apparatus, the substrate 14 coated with a silicone resin, which is not tubular, is applied to the exhaust port 12a by heat.

The substrate 14 having a thin thickness of 0.5 mm to 2 mm, suitably 1 mm to 1.5 mm, a diameter of 10 mm to 30 mm, and preferably 15 mm is placed on the inner heater 50 mounted on the shanghai conveying apparatus 40. 15) Apply and put on.

At this time, when the silicone resin 15 is placed on the substrate 14, a process of sufficiently removing impurities is necessary. At this time, if impurities are not sufficiently removed, impurities are discharged from the silicone resin 15 by the heat during driving when the flat plate or the like is operated, thereby reducing the luminance and lifespan. The silicone resin 15 from which impurities are removed in this way is applied to the substrate 14, placed on the internal heater 50, and subjected to high temperature exhaust.

While maintaining the vacuum degree of 10 ^-6 to 10 ^-7 Torr during exhaust, the temperature of the internal heater 50 was increased while the temperature was lowered to control the silicone resin 15 on the substrate 14 having a high viscosity to a low viscosity. After the gas is injected at a constant pressure, the substrate 14 is raised to close the exhaust port 12a.

The panel manufactured by this method can be made thinner because there is no residue produced when cutting the tube compared to the panel manufactured by the conventional tube. When using a long tube, the conductance is high and the vacuum time is increased. It can solve the disadvantage that the required vacuum degree is lowered.

In addition, the in-line exhaust method, which has the advantage of lowering the overall thickness of the panel, can be manufactured to be thinner because there is no glass substrate to block the pores compared to the present invention, but the gas loss is large and the process is maintained while maintaining the entire panel in vacuum. This has to be progressed, so that the equipment becomes large and takes a long time to take a vacuum, the present invention has the advantage that can be realized while reducing the disadvantages.

Accordingly, the flat fluorescent lamp 10 manufactured as described above can realize a thickness applicable to a backlight of an LCD or an illumination requiring a thin thickness.

The above embodiment is an example for explaining the technical idea of the present invention in detail, and the scope of the present invention is not limited to the above drawings and embodiments.

The present invention as described above can be carried out by firing and curing the sealing at about 250 ℃ by using a silicone resin (Si-OC), which is about 200 ℃ or more lower than the conventional method, glass at a high temperature It takes less time compared to the method of sealing by heating, and the production of equipment also requires only a low temperature control can be made simple, and there is almost no deterioration at high temperature of the phosphor due to low temperature sealing.

In addition, by using silicone resin, which is the same material as exhaust, there is no residue produced when cutting a tube compared to a panel manufactured by a conventional tube, so that the panel can be made thin and a long conducting tube has a high conductance. This can take away a lot of drawbacks and lower the degree of vacuum, the present invention is an invention that has the effect of realizing a thinning while compensating for these drawbacks.

Claims (9)

delete delete delete delete delete In the sealing and exhaust method of the flat fluorescent lamp of which at least one or more exhaust ports are formed in the rear glass, A first step of printing on the periphery of the exhaust port or the substrate covering the exhaust port by screen or discharge method using a silicon-based bonding material; A second step of removing impurities by heating to 50 to 150 ° C; Performing a vacuum evacuation at 250 to 300 ° C. with the substrate positioned at the exhaust port side; A fourth step of filling an inert gas into the fluorescent lamp; And a fifth step of firing and curing the substrate at a temperature of 150 to 250 ° C. after applying pressure to the exhaust port side. In the sealing and exhaust method of the flat fluorescent lamp, A first step of forming one or more exhaust ports in the rear glass of the flat fluorescent lamp; A second step of printing on the periphery of the exhaust port or the substrate covering the exhaust port by screen or discharge method using a silicon-based bonding material; A third step of removing impurities by heating to 50 to 150 ° C; A fourth step of performing vacuum exhaust at 250 to 300 ° C. with the substrate positioned at the exhaust port side; A fifth step of filling an inert gas into the fluorescent lamp; And a sixth step of firing and curing the substrate at a temperature of 150 to 250 ° C. after applying pressure to the exhaust port side. A flat fluorescent lamp produced by the method of claim 6. Flat fluorescent lamp produced by the method of claim 7.

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