KR100820360B1 - Apparatus for coating fluorescent layer - Google Patents

Abstract

A device for coating a fluorescent liquid on a fluorescent lamp is provided to maintain viscosity of the fluorescent liquid in a stable state by filling a reservoir with saturated vapor and thus pressing surface of the fluorescent liquid. A storage unit stores a fluorescent liquid(W) to be coated on a glass tube(G). A saturated vapor supplying unit(20) supplies vapor to the storage unit to press surface of the fluorescent liquid stored in the storage unit which prevents vaporization of the fluorescent liquid and inflow of external moisture and air. The storage unit has the first reservoir(10) in which the glass tube is immersed, and the second reservoir(16) connected to the first reservoir and positioned higher than the first reservoir, so that the fluorescent liquid can be automatically supplied to the first reservoir due to gravity.

Description

Fluorescent coating device for lamps {APPARATUS FOR COATING FLUORESCENT LAYER}

1 is a view showing the entire structure of a fluorescent coating device according to a preferred embodiment of the present invention.

FIG. 2 is a view showing a state in which a fluorescent liquid is coated on the inside of a glass tube using the fluorescent liquid coating apparatus shown in FIG. 1.

3 is a view for explaining the operation of the chamber for coating the fluorescent solution coating for the fluorescent liquid coating apparatus shown in FIG.

4 is a view for explaining a drying process of the fluorescent coating device shown in FIG.

The present invention relates to a lamp coating apparatus, and more particularly, to a lamp coating apparatus that can stably maintain the viscosity and physical properties of the fluorescent solution for coating by preventing evaporation of the fluorescent liquid by the vapor pressure.

In general, fluorescent lamps are divided into cold cathode fluorescent lamps (CCFL) and external electrode fluorescent lamps (EEFL), and the external electrode fluorescent lamps have a higher emission quality than cold cathode fluorescent lamps. It has good lamp life and power consumption, and can be manufactured in a compact size. Recently, it is widely used as a backlight lamp of LCD.

The manufacturing process of the external electrode fluorescent lamp is a process of coating a fluorescent solution in the interior of the glass tube for lamp manufacturing, the process of firing the coated fluorescent solution, the process of injecting the light emitting gas and mercury into the glass tube, the light emitting gas and A process of sealing a glass tube in a state where mercury is injected, and a process of covering electrodes at both ends of the sealed glass tube.

In particular, the phosphor coating process is an important work process for determining the light emission quality of the lamp. When the lamp is driven, visible light can be emitted when ultraviolet rays are emitted while electrons and mercury atoms collide with each other while discharge is caused by electron emission. The fluorescent liquid is coated on the inner wall surface of the glass tube so as to excite ultraviolet rays.

The process of coating the fluorescent solution includes applying a coating fluorescent solution to the inside of the glass tube, and drying the coating fluorescent solution applied to the inside of the glass tube as heat.

In the coating process used in the coating process, a liquid mixture prepared by adding a binder and a binder to a fluorescent substance and mixing with a predetermined amount of an organic solvent is used. As the organic solvent, butyl-acetate (Butyl-) is used as a volatile solvent. Acetate) is used.

In the coating process, the coating phosphor is immersed in a standing position in a storage tank in which the coating phosphor is stored, and the coating phosphor is changed into the glass tube by changing the internal pressure of the glass tube. It is applied by inhalation or discharge.

However, the lamp coating process of this type has a problem that it is difficult to stably maintain the viscosity of the fluorescent liquid when the reservoir in which the fluorescent liquid is stored is exposed to the atmosphere, or the fluorescent liquid is evaporated, or moisture in the atmosphere flows into the fluorescent liquid. .

In addition, when manufacturing a lamp, the operator should observe the storage tank visually whether the reduction of the fluorescent solution stored in the reservoir, and after confirming the reduced state of the fluorescent solution, there is a problem that the manufacturing process is complicated by manually supplementing the required fluorescent solution. .

Therefore, the present invention has been made to solve the conventional problems as described above, the object of the present invention is to prevent the evaporation of the fluorescent liquid by keeping the inside of the reservoir above a certain pressure, or can be introduced from the outside It is to provide a lamp coating apparatus that can prevent the inflow of air or moisture to maintain the physical properties of the fluorescent solution.

Still another object of the present invention is to provide a lamp coating apparatus capable of automatically filling a fluorescent solution that is reduced by allowing the fluorescent solution supplied to the reservoir to be automatically supplied by gravity.

In order to achieve the above object, a preferred embodiment of the present invention, the lamp coating apparatus, comprising: a storage unit for storing a fluorescent solution coated on a glass tube; It is characterized in that it comprises a saturated steam supply to supply the steam to the reservoir to pressurize the water surface of the fluorescent liquid stored in the storage unit to prevent evaporation of the fluorescent liquid and to prevent the inflow of external moisture / air It provides a lamp coating apparatus.

Hereinafter, with reference to the accompanying drawings will be described the structure of the lamp coating apparatus according to a preferred embodiment of the present invention.

As shown in Fig. 1, the lamp coating apparatus proposed by the present invention includes a chamber 6, a cassette 6 for storing a glass tube G coupled to the chamber C, and a chamber C. Negative pressure generating unit (M1) connected to change the internal pressure of the chamber (C) to generate a negative pressure for the application of a fluorescent solution in the glass tube (G), and the chamber (C) is connected to the chamber (C) The drying unit M2 capable of drying the internal fluorescent solution of the glass tube G by supplying a dry gas to the dry matter, and the glass tube G when the negative pressure generating unit M1 is driven by storing the fluorescent solution. A storage unit 10 and 16 capable of supplying a fluorescent liquid therein, and connected to the storage units 10 and 16 to supply saturated steam to the storage units 10 and 16 to maintain the inside at a predetermined pressure or more. Saturated vapor supply unit 18, thereby preventing the viscosity change due to evaporation of the fluorescent solution or inflow of water 20).

In the lamp coating apparatus having such a structure, the chamber (C) is formed in a predetermined size inside the hexahedral case (2), and induces a pressure difference to the fluorescent liquid (W) in the plurality of glass tubes (G) It forms a closed space for applying.

The case 2 is disposed above the frame 4, and the cassette 6 may be provided below the frame 4.

In addition, a plurality of communication holes H1 are formed in the bottom surface of the chamber C, and the upper ends of the glass tubes G are inserted into the communication holes H1, so that the interior of the glass tube G and the chamber C are inserted. ) May be in communication with each other.

The chamber C is connected to the negative pressure generating unit M1 and the drying unit M2 to apply and dry the fluorescent liquid W.

That is, as shown in FIGS. 1 and 3, first and second ports P1 and P2 are installed in the chamber C, and the negative pressure generating unit M1 is connected to the first port P1. This induces a pressure difference inside the chamber C.

The negative pressure generating unit M1 preferably includes a vacuum pump so that the negative pressure acts through the first connecting pipe A1 when the vacuum pump is driven.

Therefore, when the negative pressure generating unit M1 is driven, the negative pressure acts on the inside of the chamber C, so that the negative pressure also acts on the inside of the glass tube G, so that the fluorescent liquid in the storage units 10 and 16 becomes the glass tube G. May be sucked into the interior.

In addition, the inside of the glass tube G coated with the fluorescent liquid is dried by connecting the drying unit M2 to the second port P2 of the chamber C.

That is, as shown in Figs. 1 and 4, the drying unit M2 preferably includes a blower. The drying unit M2 is connected to the second port P2 through the second connecting pipe A2, so that when the blower is operated, the drying gas heated in the 150 ° C temperature range enters the chamber C. It can be supplied and it can dry the inside of glass tube G.

In addition, a plurality of glass tubes G which are thus coupled to and separated from the chamber C are loaded by the cassette 6.

The cassette 6 is formed of upper and lower trays B1 and B2 spaced apart from each other by upper and lower portions, respectively, and fixing bars B connecting the upper and lower trays B1 and B2 to each other.

Fixing holes H2 are formed in the upper and lower trays B1 and B2, respectively, and a plurality of glass tubes G are inserted into the fixing holes H2, respectively.

At this time, the fixing holes (H2) are formed in the same arrangement as the plurality of communication holes (H1) formed in the bottom surface of the chamber (C) so that each of the cassette 6 is mounted to the case (2) Upper ends of the glass tubes G are fitted into the communication holes H1 of the chamber C.

Although described above as a glass tube, the present invention is not limited thereto, and may include other materials such as synthetic resin.

Referring again to FIGS. 1 and 2, the cassette 6 having such a structure is mounted on a lift 8 installed inside the frame 4, and then moved up and down along the lift 8. The upper tray B1 may be detachably mounted on the bottom surface of the case 2.

That is, the lift 8 may be a plurality of cylinders (L1) installed on the bottom surface of the frame 4, the cassette 8 by raising and lowering the lift (8) by the piston rod of the cylinder (L1) (6) can be moved up and down.

The storage units 10 and 16 for storing the fluorescent liquid coated on the glass tube G may include a first reservoir 10 for storing the fluorescent liquid sucked into the glass tube G, and the first storage tank. It is connected to the (10) consists of a second reservoir (16) for automatically supplying the fluorescent liquid to the first reservoir (10) by gravity.

In the storage unit having such a structure, the first reservoir 10 may store a fluorescent liquid by forming a space having a predetermined capacity therein.

In addition, two cylinders L2 are provided below the first reservoir 10 to raise and lower the first reservoir 10. Therefore, when the cylinder L2 is driven, the lower end of each glass tube G mounted on the chamber C side may be immersed in the coating fluorescent solution W by raising the first reservoir 10.

At this time, the opening and closing member (D1, D2) is provided on the upper portion of the first reservoir (10) to open or block the entry of the lower end of the glass tube (G) into the first reservoir (10).

That is, the opening and closing member (D1, D2) is composed of the upper and lower opening and closing plates (D1, D2) arranged up and down, the upper opening and closing plate (D1) of the upper and lower opening and closing plates (D1, D2) is a cylinder (L4) ) In addition, a plurality of guide holes 14 are formed in the upper and lower opening and closing plates D1 and D2, respectively.

Therefore, when the piston of the cylinder (L4) is driven, the upper opening and closing plate (D1) moves in one direction, so that the guide holes 14 of the upper and lower opening and closing plates (D1, D2) coincide with the glass tube (G). The lower end of the can be inserted into the interior of the first reservoir 10 through the guide hole 14, the first reservoir 10 may be sealed when the guide holes 10 are shifted from each other.

Such a structure can be opened so that only one end of each glass tube G can enter the first reservoir 10 through the guide hole 14 only when the coating fluorescent solution (W) is applied. Therefore, the coating phosphor (W) contained in the reservoir 10 can be stored in a sealed state.

And, the exhaust pipe (T) is connected to the upper portion of the first reservoir 10 can be discharged to the saturated steam filled in the first reservoir (10) to the outside as will be described later.

The second reservoir 16 is disposed at a position higher than the first reservoir 10, and a fluorescent liquid may be stored by forming a predetermined space therein.

The second reservoir 16 has a fluorescent liquid supply pipe T1 connected to a lower portion thereof, and the fluorescent liquid supply pipe T1 is connected to one side of the first reservoir 10. At this time, the second reservoir 16 is disposed at a position higher than the first reservoir 10 as described above.

Therefore, as the fluorescent liquid stored in the first reservoir 10 is reduced, the fluorescent liquid stored in the second reservoir 16 is supplied to the first reservoir 10 through the fluorescent liquid supply pipe T1 by gravity. Can be.

Meanwhile, the saturated steam supply units 18 and 20 are connected to the first reservoir 10 to maintain the inside of the first reservoir 10 at a constant pressure.

The saturated steam supply unit 18 and 20 are connected to the first reservoir 10 to supply saturated steam to maintain the first reservoir 10 at a constant pressure, and the steam generator ( 18) is made up of a solvent supply tank 20 to replenish the solvent used to supply the solvent.

In the saturated steam supply having such a structure, the solvent supply tank 20 stores a solvent, preferably an organic solvent, therein. The stored organic solvent is supplied to the steam generator 18 through the solvent supply pipe T3.

The steam generator 18 may store an organic solvent supplied from the solvent supply tank 20 by forming a predetermined space therein.

In addition, air may be injected into the steam generator 18 by connecting the air injection pipe 22.

At this time, the interior of the steam generating tank 18 is a saturated steam pressure state. That is, it is an equilibrium state in which vapor evaporated from the organic solvent reaches a certain limit and no longer occurs.

When air is injected into the steam generator 18 through the air inlet tube 22 in this state, the saturated vapor pressure of the organic solvent exceeds the atmospheric pressure so that steam is again generated from the organic solvent in an equilibrium state.

Then, the saturated steam generated in this way is supplied to the first storage tank 10 through the steam supply pipe (T2). In this case, a pressure gauge may be provided to measure the pressure of the air injected through the air injection pipe 22.

Therefore, the saturated steam supplied to the first reservoir 10 is filled in the upper space of the water surface formed by the fluorescent solution stored in the first reservoir 10 to become saturated and pressurize the fluorescent liquid at a constant pressure.

As a result, such a saturated vapor can be prevented from evaporating the fluorescent solution in the first reservoir 10 can be prevented from changing the viscosity of the fluorescent solution.

In addition, the internal pressure of the first reservoir 10 is maintained above a predetermined pressure, preferably above atmospheric pressure by the supplied saturated steam.

Therefore, the saturated steam can be discharged to the outside through the guide hole 14 and the exhaust pipe (T) of the opening and closing members (D1, D2) by the pressure of the atmospheric pressure or more, in this case, the guide of the opening and closing members (D1, D2) The viscosity of the fluorescent liquid may be stably maintained by preventing the inflow of moisture or air in the atmosphere, which may be introduced into the first reservoir 10 through the hole 14.

At this time, the exhaust pipe (T) is provided on the upper portion of the first reservoir 10, the saturated steam in the same pressure state as the pressure of the saturated steam supplied to the first reservoir 10 is discharged to the outside through the exhaust pipe (T) do.

Therefore, the saturated steam filled in the first reservoir 10 can continuously maintain a constant pressure state, and discharged through the exhaust pipe T by the amount of saturated steam newly supplied to the first reservoir 10 to the first reservoir. It is possible to prevent the saturated steam from being excessively filled in the inside of (10) above a certain limit.

The vapor supply pipe T2 or the fluorescent liquid supply pipe T1 can control the amount of steam or fluorescent liquid supplied by attaching a flow control valve having a conventional structure.

As described above, in the process of coating and drying the fluorescent solution inside the glass tube, it is possible to improve the coating efficiency of the fluorescent solution by maintaining the viscosity of the fluorescent solution stably by preventing evaporation of the fluorescent solution and inflow of moisture or air. have.

Hereinafter, the operation of the lamp coating apparatus according to a preferred embodiment of the present invention with reference to the accompanying drawings will be described in more detail.

As shown in Figure 1 and 2, when the fluorescent solution is coated on the inside of the glass tube (G) by using a coating apparatus, first, a certain amount of the fluorescent solution is stored in the interior of the first reservoir (10).

That is, the fluorescent liquid stored in the second reservoir 16 is supplied to the first reservoir 10 through the phosphor supply pipe T1 using gravity.

At this time, the organic solvent supplied from the solvent reservoir 20 is stored in the steam generator 18 connected to the first reservoir 10, and maintains a saturated steam pressure.

In this state, the air is injected into the steam generator 18 through the air injection pipe 22 so that the saturated steam pressure of the organic solvent stored in the steam generator 18 exceeds the atmospheric pressure.

Therefore, saturated steam is generated from the organic solvent stored in the steam generator 18, and the saturated steam is supplied into the first storage tank 10 through the steam supply pipe T2.

Saturated steam supplied to the first reservoir 10 pressurizes the water surface at a constant pressure by filling the upper space of the water surface formed by the fluorescent liquid in a saturated state.

Therefore, since the evaporation of the fluorescent liquid can be suppressed due to the pressure of the saturated steam, the viscosity can be prevented from being lowered even after long-term storage.

In addition, since the amount of saturated steam newly supplied to the first storage tank 10 is discharged through the exhaust pipe T, the inside of the first storage tank 10 may be prevented from being overcharged to a predetermined limit or more.

In this state, a plurality of glass tubes G are loaded into the cassette 6, and the cassette 6 on which the glass tubes G are loaded is lifted up using the lift 8 to raise the upper end of the glass tube G into the chamber C. It communicates with the chamber (C) through the communication hole (H1) of.

As described above, the lower end of the glass tube G is inserted through the guide hole 14 of the opening / closing members D1 and D2 by raising the lifter L2 of the first reservoir 10 supplying the saturated steam. 1 may be located inside the reservoir (10).

At this time, external moisture or air may be introduced into the first storage tank 10 through the guide hole 14 and the exhaust pipe T of the opening and closing members D1 and D2.

However, in this case, since the internal pressure of the first reservoir 10 is above atmospheric pressure, saturated steam is discharged to the outside through the guide hole 14 and the exhaust pipe T of the opening / closing members D1 and D2. The viscosity of the fluorescent liquid may be stably maintained by preventing water or air from flowing into the storage tank 10.

In this state, as shown in FIGS. 1 and 3, the one end of the plurality of glass tubes G is mounted on the side of the chamber C, and is driven through the port P1 due to the driving of the negative pressure generating unit M1. The negative pressure acts inside the chamber C.

Therefore, the fluorescent solution stored in the first reservoir 10 may be sucked into each of the glass tubes G by negative pressure to apply the coating fluorescent solution W. FIG.

1 and 4, hot air can be supplied into the glass tube G to be dried by driving the drying unit M2.

That is, the drying gas is supplied into the glass tube G through the port P2 connected to the chamber C and dried.

Through the process as described above may be coated with a fluorescent solution inside the glass tube (G) and dried.

As described above, the lamp coating apparatus according to the preferred embodiment of the present invention has the following advantages.

First, it is possible to improve the coating quality of the glass tube by preventing the evaporation of the fluorescent solution by maintaining the viscosity of the fluorescent solution by pressurizing the water surface of the stored fluorescent liquid by filling the saturated steam in the reservoir.

Second, by maintaining the inside of the reservoir above a certain pressure to discharge the saturated steam to the outside through the guide hole and the exhaust pipe of the opening and closing member to prevent the outside moisture or air to enter the inside of the reservoir to stabilize the viscosity of the fluorescent solution I can keep it.

Third, by connecting the reservoir in which the fluorescent liquid is stored and a separate reservoir disposed at a higher position than the reservoir, the fluorescent liquid may be automatically filled by automatically supplying the fluorescent liquid by gravity.

Claims (6)

In the lamp coating apparatus, A storage unit for storing the fluorescent liquid coated on the glass tube; By supplying steam to the reservoir to pressurize the water surface of the fluorescent liquid stored in the storage unit to prevent the evaporation of the fluorescent liquid, characterized in that it comprises a saturated steam supply that can prevent the inflow of moisture / air outside Lamp coating equipment. According to claim 1, wherein the storage unit is connected to the first reservoir and the glass tank is locked, the first reservoir is disposed in a position higher than the position of the first reservoir to automatically transfer the fluorescent liquid to the first reservoir by gravity. Lamp coating apparatus comprising a second reservoir that can be supplied. The lamp coating apparatus according to claim 2, wherein the first reservoir further comprises an opening and closing member for selectively entering the glass tube into the inside thereof, and an exhaust pipe for discharging steam filled in the first reservoir to the outside. . The steam generator according to claim 2, wherein the saturated steam supply unit is connected to the first storage tank to supply saturated steam to maintain the inside of the first storage tank at a constant pressure, and the solvent consumed by supplying a solvent to the steam generating tank. And a solvent supply pipe for replenishing, a solvent supply pipe for connecting the solvent supply tank and a steam generator, and a steam supply pipe for connecting the steam generator and the first storage tank. The lamp coating apparatus of claim 4, wherein the steam generator includes an air injection tube for injecting air therein to generate saturated steam in the steam generator. The lamp coating apparatus of claim 5, wherein the air injection pipe further comprises a pressure gauge for checking the pressure of the air to be injected.

Images