JP2002365606A - Liquid crystal dropping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a liquid crystal dropping device for dropping a fixed quantity of a liquid crystal onto a substrate. SOLUTION: A dropping pot 10 for storing a fixed quantity of the liquid crystal which is supplied from a dispenser 50 is provided and a plunger 20 is inserted on the inner side of the dropping pot 10 movably up and down. The fixed quantity of the liquid crystal 40 precipitated at the inner bottom part of the dropping pot 10 can be made to forcibly flow out onto the substrate 60 below the dropping pot 10 through a flow-out hole 12 at the bottom part of the dropping pot, or an upper end opening part of the flow-out hole 12 at the bottom part of the dropping pot can be closed by downwardly moving the plunger 20 in the inner part of the dropping pot 10. The fixed quantity of the liquid crystal 40 stored in the dropping pot 10 can be precipitated at the inner bottom part of the dropping pot 10, or the upper end opening part of the flow-out hole 12 at the bottom part of the dropping pot can be opened when the plunger 20 is upwardly moved in the inner part of the dropping pot 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal dropping apparatus mainly used for dropping a predetermined amount of liquid crystal onto a substrate such as a glass substrate for forming a liquid crystal panel.

[0002]

2. Description of the Related Art A conventional liquid crystal dropping apparatus has a structure in which a fixed amount of liquid crystal is supplied from a dispenser and stored in a dropping point. Then, the liquid crystal stored in the dropping pot is supplied to a substrate such as a TFT substrate for forming a liquid crystal panel disposed below the dropping pot, through an outflow hole opened at the bottom of the dropping pot. In this liquid crystal dropping device, when the liquid crystal is supplied from the inside of the dropping point to the substrate, the check valve protruding downward from the inside of the dropping point through the outflow hole is provided by the substrate arranged below the dropping point. , Is being pushed up inside the dripping point. Then, an outflow hole at the bottom of the dropping pot, which is closed by the check valve, is opened. Then, through the opened outflow hole, the liquid crystal stored in the dropping point is spontaneously flown out onto a substrate disposed below the dropping point by using gravity applied to the liquid crystal. Then, a fixed amount of liquid crystal stored in the dropping point is supplied onto a substrate disposed below the dropping point.

As described above, the empty outflow hole at the bottom of the dropping pot after the supply of a fixed amount of liquid crystal onto the substrate is closed again by the check valve. At this time, the substrate, which has pushed the check valve inward of the dropping point and has been supplied with a certain amount of liquid crystal, is removed from below the dropping point. The check valve is moved downward in the drip point using the weight applied to the check valve. The outflow hole is closed by the check valve.

As described above, a fixed amount of liquid crystal is again supplied from the dispenser into the drip point after closing the outflow hole with the check valve. Hereinafter, the same steps are repeatedly performed, and a constant amount of liquid crystal is continuously supplied from the inside of the dropping pot to a substrate arranged one after another below the dropping pot.

[0005]

However, as described above, when a fixed amount of liquid crystal is supplied from the inside of the dropping pot onto the substrate disposed below the dropping point, the liquid crystal supplied onto the substrate is not supplied. Since the liquid naturally flows out from the inside of the dropping pot through the outflow hole at the bottom of the dropping pot, it is impossible to supply all of the liquid crystal supplied from the dispenser to the substrate through the outflow hole at the bottom of the dropping pot quickly and completely. Was. Then, a part of the liquid crystal supplied from the dispenser into the dropping pot was left attached to the inner peripheral surface of the dropping pot or the check valve surface. Then, the expensive liquid crystal was wasted and wasted without being used effectively.

Further, when the liquid crystal stored in the dropping point is spontaneously discharged below the dropping point through the outlet hole at the bottom of the dropping point as described above, the amount of liquid crystal spontaneously flowing below the dropping point is reduced. Variations have occurred. Therefore, in order to prevent a shortage of the liquid crystal supplied from the inside of the dropping pot onto the substrate, it is necessary to supply a larger amount of liquid crystal than necessary from the dispenser into the dropping pot. As a result, expensive liquid crystals are wasted.

In order that all of the liquid crystal supplied from the dispenser into the dropping point can be supplied to the substrate below the dropping point without waste, the liquid crystal collected in the dropping point should be taken for a sufficient time. A method of allowing the water to naturally flow down to the lower part of the dropping point through the outlet hole at the bottom of the dropping point is considered. However, in such a case, it is not possible to quickly supply the liquid crystal stored in the dropping point to the substrate disposed below the dropping point without taking time. It cannot be used for manufacturing such as.

In the above-described liquid crystal dropping apparatus, the outflow hole provided at the bottom of the dropping pot is closed by the check valve by using only the gravity applied to the check valve. A gap is easily formed between the liquid and the inner peripheral surface of the outflow hole, and the permeable liquid crystal in the dropping pot may leak below the dropping pot through the gap.

In the above liquid crystal dropping device, the tip of the check valve is brought into direct contact with the substrate in a point contact state, and the check valve is pushed up into the dropping pot by the substrate. The fragile substrate could be damaged by the pressure applied above. At the same time, dust adhering to the check valve may stain a clean substrate.

The present invention can solve such problems.
Provided is a liquid crystal dropping device that can quickly and completely flow liquid crystal supplied from a dispenser into a dropping point onto a substrate disposed below the dropping point without damaging or soiling the substrate. The purpose is.

[0011]

In order to achieve the above-mentioned object, a liquid crystal dropping device according to the present invention comprises a dropping pot for storing liquid crystal supplied from a dispenser, and a bottom inside the dropping pot provided at the bottom of the dropping pot. Having an outflow hole through which the liquid crystal sunk in the drip acupoint flows out below the drip acupoint, a plunger inserted movably up and down inside the drip acupoint, and moving means for moving the plunger up and down in the drip acupoint. When the plunger is moved downward in the drip point by means,
The space inside the dropping fountain so that the liquid crystal that has settled at the bottom of the dropping fountain can be pumped down through the outflow hole by the plunger and flowed out below the dropping fountain, or the upper end opening of the outflow hole opening at the bottom of the dropping fountain can be closed by the plunger. And the shape of the plunger is configured, and when the plunger is moved upward in the dropping point by the moving means,
The space inside the drip acupoint and the plunger and the plunger so that the liquid crystal stored in the drip acupoint can be settled at the bottom of the drip acupoint without being disturbed by the plunger, or the upper end opening of the outflow hole closed by the plunger can be opened. Is configured.

In this liquid crystal dropping device, the plunger can be moved downward in the dropping pot by the moving means. Then, the upper end opening of the outflow hole opened at the inner bottom of the dropping pot can be closed by the plunger. Next, a fixed amount of liquid crystal can be supplied from the dispenser into the dropping pot in which the opening at the upper end of the outflow hole is closed by the plunger, and the fixed amount of liquid crystal can be stored in the dropping pot. Next, the plunger can be moved upward in the drip point by the moving means. Then, the above-mentioned fixed amount of liquid crystal stored in the dropping pot can be settled at the bottom of the dropping pot without disturbing the plunger. Also,
In this way, when the plunger is moved upward in the drip acupoint by the moving means, the upper end opening of the outflow hole at the bottom of the drip acupoint closed by the plunger can be opened. Thereafter, the plunger can be moved downward again in the drip point by the moving means. Then, a fixed amount of liquid crystal settled at the bottom of the dropping pot is rapidly and forcibly pumped by the plunger through the outlet hole at the bottom of the dropping pot with the opening at the upper end thereof. Can be drained. And
All of the fixed amount of liquid crystal supplied from the dispenser into the dropping point can be discharged onto the substrate disposed below the dropping point without leaving the liquid crystal in the dropping point. Further, in this way, when the plunger is moved downward in the drip acupoint by the moving means, the upper end opening of the outflow hole at the bottom of the drip acupoint can be reliably closed by the plunger. Then, it is possible to reliably prevent the permeable liquid crystal in the dropping pot from leaking below the dropping pot through the outflow hole at the bottom of the dropping pot.

In addition, when the fixed amount of liquid crystal supplied from the dispenser into the dropping point is caused to flow out of the dropping point at the bottom of the dropping point onto the substrate by the plunger as described above, the above-described check is performed on the substrate. Since it is not necessary to press-contact the tip of the valve in a point contact state, the check valve can prevent the substrate from being damaged and the substrate from being stained with dust attached to the check valve.

In the liquid crystal dropping device of the present invention, the lower space inside the dropping pot is formed in an inverted truncated cone shape, and the middle space inside the dropping pot that follows the lower space inside the dropping pot is the upper end of the lower space inside the dropping pot. It is formed in a columnar shape having the same inner diameter as that of the above, and the upper space in the drip pot following the halfway space in the drip pot is formed in the shape of an inverted truncated cone with the lower end having the same inner diameter as the halfway space in the drip pot. In accordance with this, the lower part of the plunger is formed in an inverted truncated cone shape having a size that fits into the lower space inside the dripping pot without a gap, and the middle part of the plunger following the lower part of the plunger has the same outer diameter as the upper end of the lower part of the plunger. The plunger is formed in a cylindrical shape large enough to fit into the halfway space inside the drip pot with no gap, and the outer diameter of the lower end of the upper part of the plunger following the middle part of the plunger has the same outer diameter as the halfway part of the plunger. One to a truncated cone shape formed structure is the preferred.

In this liquid crystal dropping device, when the plunger is moved downward in the dropping point by the moving means,
The lower part of the plunger formed in the shape of an inverted truncated cone can be fitted without any gap into the lower space in the dropping pot similarly formed in the shape of an inverted truncated cone. Then, the upper end opening of the outflow hole opened at the inner bottom of the dropping pot can be closed by the plunger. At the same time, the cylinder-shaped intermediate portion of the plunger can be fitted into the column-shaped intermediate portion space of the dropping pot without any gap. The lower space in the dropping pot and the space in the middle of the dropping pot can be closed without gap by the lower part of the plunger and the middle part of the plunger. Then, a fixed amount of liquid crystal supplied from the dispenser into the dropping pot can be stored in a gap between the upper part of the plunger formed in a truncated cone and the inner peripheral surface of the upper part of the dropping pot facing the plunger. Next, when the plunger is moved upward in the drip acupoint by the moving means, the upper end opening of the outflow hole at the bottom of the drip acupoint closed by the plunger can be opened. At the same time, the cylinder-shaped middle part of the plunger is disposed in the upper space inside the larger inverted truncated cone-shaped dropping pot, and the lower part of the inverted truncated cone-shaped plunger is set in the larger cylindrical shaped dropping pot. It can be arranged in the inner halfway space, the lower space inside the dripping pot having an inverted truncated cone shape, or the upper space inside the dripping pot. And
A gap can be provided between the middle part of the plunger or the lower part of the plunger and the inner peripheral surface of the upper part of the drip acupoint, the inner peripheral surface of the middle part of the drip acupoint, or the inner peripheral surface of the lower part of the drip acupoint. Then, through the gap, the above-mentioned fixed amount of liquid crystal accumulated in the gap between the upper portion of the plunger and the inner peripheral surface of the upper portion of the drip pot facing the plunger can be allowed to settle to the inner bottom of the drop pot, and then the plunger is moved by the moving means. When the inside of the dropping pot was moved downward again, the fixed amount of liquid crystal settled at the bottom of the dropping pot was forced downward by the plunger through the outlet hole provided at the bottom of the dropping pot. It can be pumped and discharged quickly and thoroughly. Also, in this way, when the plunger is moved downward in the drip pot by the moving means, the lower part of the plunger and the middle part of the plunger are continuously connected to the lower space in the drip pot and the intermediate space in the drip pot connected thereto. Can be fitted without any gap. A part of the liquid crystal that is forcibly pumped and discharged to below the dropping point through the outlet hole by the plunger is formed between the lower part of the plunger and the middle part of the plunger and the inner peripheral surface of the lower part of the dropping point and the inner peripheral surface of the halfway part of the dropping point. Can be prevented from escaping to the upper space in the dropping point. At the same time, the upper end opening of the outflow hole at the bottom of the dropping pot can be reliably closed by the lower part of the plunger. Then, it is possible to reliably prevent the permeable liquid crystal in the dropping pot from leaking below the dropping pot through the outflow hole at the bottom of the dropping pot.

[0016]

1 to 3 show a preferred embodiment of a liquid crystal dropping device according to the present invention, and FIGS. 1 to 3 are explanatory diagrams of the operation of the device. Hereinafter, the liquid crystal dropping device will be described.

This liquid crystal dropping device is provided with a dispenser 50.
And a small-diameter outflow hole 12 provided at the bottom of the dropping pot 10 for storing liquid crystal supplied from
The liquid crystal 40 settled at the bottom of the dropping pot 10 is dropped on the dropping pot 10.
It has an outflow hole 12 for flowing downward, a plunger 20 fitted inside the drip acupoint 10 so as to be movable up and down, and a rod-shaped moving means 30 for moving the plunger 20 up and down inside the drip acupoint 10. . The drip point 10 is the liquid crystal 4
It is made of water-repellent Teflon (registered trademark) to which 0 is hardly attached, and has a structure in which the upper end is widely opened. The plunger 20 is formed of ceramic, quartz glass, or Teflon, from which it is difficult to discharge dust, and has a size that allows the space inside the drip pot 10 to be moved up and down. The moving means 30 has a structure driven by an electric motor or an air cylinder. Then, the plunger 20 is dropped by the moving means 30 onto the acupoint 10.
When the liquid crystal 40 has been moved downward, as shown in FIG.
As shown in FIG. 1, the plunger 20 can close the upper end opening of the outflow hole 12 that opens at the bottom of the drip pot 10 as shown in FIG. Pot 1
The shapes of the inner space 0 and the plunger 20 are configured.
At the same time, when the plunger 20 is moved upward in the drip pot 10 by the moving means 30, as shown in FIG.
0 and the plunger 10 so that the plunger 10 can be settled at the bottom of the dropping pot 10 or opened at the upper end of the outflow hole 12 at the bottom of the dropping pot 10 closed by the plunger 20. 20 is configured.

The liquid crystal dropping device shown in FIGS.
With the liquid crystal dropping device configured as described above, the plunger 20 can be moved downward in the dropping pot 10 by the moving means 30 as shown in FIG. Then, an outflow hole 1 opened at the bottom of the drip point 10.
2 can be closed by the plunger 20. Then, as shown in FIG.
A fixed amount of liquid crystal can be supplied from the dispenser 50 disposed above the dropping pot 10 into the dropping pot 10 whose upper end opening is closed by the plunger 20. Then, the fixed amount of liquid crystal can be stored in the dropping pot 10. Next, as shown in FIG. 2, the plunger 20 can be moved upward in the drip pot 10 by the moving means 30. Then, the above-mentioned fixed amount of liquid crystal 40 stored in the dropping point 10 is dropped by the dropping point 1 without being disturbed by the plunger 20.
0 can sink to the bottom. Further, in this manner, the plunger 20 is dropped by the moving means 30 onto the acupoint 1.
When the inside is moved upward, the upper end opening of the outflow hole 12 at the bottom of the drip pot 10 closed by the plunger 20 can be opened. After that, as shown in FIG.
Inside can be moved down again. Then, a fixed amount of the liquid crystal 40 settled at the bottom of the dropping pot 10 is
The plunger 20 passes through the outlet hole 12 at the bottom of the dropping pot 10 having the upper end opening, and the plunger 20 is used.
It can be forcibly and quickly pumped out without leaving any space below. Then, all of the fixed amount of the liquid crystal 40 supplied from the dispenser 50 into the dropping pot 10 can be quickly discharged onto the substrate 60 disposed below the dropping pot 10 without leaving the liquid crystal 40 in the dropping pot 10. . Further, in this manner, the plunger 2 is moved by the moving means 30.
When the “0” is moved downward in the dropping pot 10, the upper end opening of the outflow hole 12 at the bottom of the dropping pot can be reliably closed by the plunger 20. Then, it is possible to reliably prevent the permeable liquid crystal 40 in the dropping pot 10 from leaking below the dropping pot 10 through the outflow hole 12 at the bottom of the dropping pot.

As described above, when the fixed amount of liquid crystal 40 supplied from the dispenser 50 into the dropping pot 10 is forced out of the substrate 60 through the outflow hole 12 at the bottom of the dropping pot 10 by the plunger 20, Since it is not necessary to press the tip of the above-described check valve (not shown) onto the substrate 60 in a point-contact state, the substrate may be damaged by the check valve or dust adhered to the check valve. The substrate 60 can be prevented from becoming dirty.

In this liquid crystal dropping apparatus, as shown in FIGS. 1 to 3, the lower space 14 inside the dropping pot is formed in the shape of an inverted truncated cone, and a halfway portion inside the dropping pot following the lower space 14 inside the dropping pot. The space 16 is formed in a columnar shape having the same inner diameter as the upper end of the inner space 14 of the drip pot, and the upper space 18 in the drip pot following the space 16 in the middle of the drip pot has an inner diameter of the lower end in the space in the middle of the drip pot. It is preferable to form an inverted truncated cone having the same inner diameter as 16. At the same time, the lower part 24 of the plunger is formed in the shape of an inverted truncated cone having a size that fits into the lower space 14 inside the drip acupoint without any gap. It is formed in a cylindrical shape large enough to fit into the middle space 16 inside the drip pot with the same outer diameter as the upper end without any gap.
The upper part 28 of the plunger following the middle part 26 of the plunger is preferably formed in a truncated cone shape having the same outer diameter as the middle part 26 of the plunger.

In this case, when the plunger 20 is moved downward in the drip pot 10 by the moving means 30, as shown in FIG. 1, the plunger lower portion 24 formed in an inverted truncated cone shape is also inverted. It can be fitted in the lower space 14 inside the dripping pot formed in the shape of a truncated cone without any gap. The upper end opening of the outflow hole 12 opening at the bottom of the drip pot 10 can be closed by the plunger 20. At the same time, the intermediate portion 26 of the plunger formed in a columnar shape can be fitted into the space 16 in the intermediate portion of the dropping pot similarly formed in the columnar shape without any gap. Then, the lower space 14 in the dropping pot and the space 16 in the middle of the dropping pot can be closed without gaps by the lower plunger 24 and the middle part 26 of the plunger. And the dispenser 50
As shown in FIG. 1, a fixed amount of the liquid crystal 40 supplied into the dropping pot 10 is supplied to the gap between the plunger upper portion 28 formed in a truncated cone shape and the droppering pot upper inner peripheral surface 17 opposed thereto. Can be stored. Next, when the plunger 20 is moved upward in the drip pot 10 by the moving means 30, as shown in FIG. 2, the upper end opening of the outflow hole 12 at the bottom of the drip pot 10 closed by the plunger 20. Can be opened. At the same time, the cylinder-shaped plunger middle portion 26 is arranged in the upper space 18 inside the dripping pot having a larger inverted truncated cone shape, or the plunger lower portion 24 having the inverted truncated cone shape is formed into a larger cylindrical shape. It can be arranged in the middle space 16 in the dropping pot, the lower space 14 in the dropping pot in the shape of an inverted truncated cone, or the upper space 18 in the dropping pot. Then, a gap can be formed between the middle part 26 of the plunger or the lower part 24 of the plunger and the inner peripheral surface 17 of the upper part of the drip pot, the inner peripheral surface 15 of the halfway part of the drip pot, or the inner peripheral surface 13 of the lower part of the drip pot. Then, through the gap, the above-mentioned fixed amount of liquid crystal 40 collected in the gap between the upper portion 28 of the plunger and the inner peripheral surface 17 of the upper portion of the drip pot facing the plunger is applied to the inner bottom of the drip pot 10 as shown in FIG. Thereafter, when the plunger 20 is moved downward again in the drip pot 10 by the moving means 30, as shown in FIG.
A fixed amount of the liquid crystal 40 settled at the inner bottom is dispensed with the plunger 20.
As a result, it is possible to forcibly and quickly pressurize and discharge the liquid under the dripping pot 10 through the outflow hole 12 provided at the bottom of the dripping pot 10. Further, in this manner, the plunger 20 is dropped by the moving means 30 onto the acupoint 10.
When the inside of the drip point is moved downward,
The plunger lower part 24 and the plunger halfway part 26 can be continuously fitted into the halfway space 16 inside the drip acupoint, which is continuous therewith, without any gap. A part of the liquid crystal 40 that is forcibly pumped and discharged to below the dropping pot 10 through the narrow outflow hole 12 by the plunger 20 is moved to the lower part 2 of the plunger.
4 and the middle part 26 of the plunger and the inner peripheral surface 13 of the lower part of the dropping pot and the inner peripheral surface 15 of the halfway part of the dropping pot facing the same, it is possible to prevent the wasteful escape to the upper space 18 inside the dropping pot. At the same time, the upper end opening of the outflow hole 12 at the bottom of the dropping pot can be reliably closed by the lower plunger 24. Then, it is possible to reliably prevent the permeable liquid crystal 40 in the dropping pot 10 from leaking below the dropping pot 10 through the outflow hole 12 at the bottom of the dropping pot.

The liquid crystal dropping device of the present invention can also be used for a device for supplying a fixed amount of liquid other than liquid crystal onto a substrate and other various electronic components. In addition, the liquid crystal dropping device of the present invention can be used even in a vacuum environment up to about 1.3 pa.
Available.

[0023]

As described above, according to the liquid crystal dropping device of the present invention, a fixed amount of liquid crystal supplied from the dispenser into the dropping point is completely and forcibly forced onto the substrate disposed below the dropping point. It is possible to quickly and pressurelessly discharge and outflow. Then, it is possible to reliably prevent a part of the liquid crystal supplied from the dispenser into the dropping pot from being effectively used in a state where the liquid crystal adheres to the inner peripheral surface of the dropping pot and is left unnecessarily. In addition, it is not necessary to supply a large amount of liquid crystal in excess of the used amount from the dispenser into the dropping point, and wasteful consumption of liquid crystal can be suppressed. In addition, the permeable liquid crystal in the drip acupoint leaks out below the drip acupoint through the outflow hole at the bottom of the drip acupoint.
It can be reliably prevented. Further, it is possible to prevent the substrate for supplying the liquid crystal from being damaged by the check valve, and to prevent the substrate for supplying the liquid crystal from being stained by dust attached to the check valve. Furthermore, because the liquid crystal stored in the dropping acupoint is forcibly pumped out under the dropping acupoint by the plunger through the outlet at the bottom of the dropping acupoint, the liquid crystal stored in the dropping acupoint is dropped through the outlet at the bottom of the dropping acupoint. The outflow hole at the bottom of the dropping pot can be formed to have a smaller diameter than a liquid crystal dropping device having a structure in which the liquid flows out naturally below the pot. And
Through the small-diameter outflow hole, it is possible to accurately supply the liquid crystal stored in the dropping pot to a desired position on the substrate disposed below the dropping pot without displacement.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an operation state of a liquid crystal dropping device of the present invention.

FIG. 2 is an explanatory diagram of an operation state of the liquid crystal dropping device of the present invention.

FIG. 3 is an explanatory diagram of an operation state of the liquid crystal dropping device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Drop pot 12 Drop hole at the bottom of drop pot 14 Drop space in drop pot 16 Intermediate space in drop pot 18 Plumper upper space 20 Plunger 24 Plunger lower 26 Midway plunger 28 Plunger upper 30 Moving means 40 Liquid crystal 50 Dispenser 60 Substrate

Continued on the front page F term (reference) 2H088 FA30 HA01 MA20 2H089 NA34 NA60 PA12 QA08 QA12 QA13 4F041 AA02 AA05 AB02 BA02 BA12 BA32 BA36

Claims (2)

[Claims] 1. A drop acupoint for storing liquid crystal supplied from a dispenser, an outflow hole provided at the bottom of the drop acupoint, for letting liquid crystal settled down at the bottom of the drop acupoint, and flowing vertically below the drop acupoint. It has a plunger movably inserted therein and a moving means for moving the plunger up and down in the drip acupoint. When the moving means moves the plunger downward in the drip acupoint, the inner bottom of the drip acupoint. The plunger space between the plunger and the plunger so that the liquid crystal that has settled down can be pumped down through the outflow hole by the plunger and flowed out below the drip point, or the upper end opening of the outflow hole opened at the bottom of the drip pot can be closed by the plunger. When the plunger is moved upward in the dropping point by the moving means, the liquid crystal stored in the dropping point is plunged. The interior of the drip pot and the shape of the plunger are configured so that the plunger can sink to the bottom of the drip pot without being disturbed, or can open the upper end opening of the outflow hole closed by the plunger. Liquid crystal dropping device. 2. The lower space inside the dropping pot is formed in the shape of an inverted truncated cone, and an intermediate space inside the dropping pot that follows the lower space inside the dropping pot has a cylindrical shape having the same inner diameter as the upper end of the lower space inside the dropping pot. Is formed in an inverted truncated conical shape having an inner diameter of the lower end thereof having the same inner diameter as the halfway space in the dropping pot, the upper space in the dropping pot following the halfway space in the dropping pot.
In accordance with that, the lower part of the plunger is formed in an inverted truncated cone shape having a size that fits into the lower space inside the dripping pot without a gap, and the middle part of the plunger following the lower part of the plunger is
It is formed in a cylindrical shape large enough to fit into the space inside the drip pot with the same outer diameter as the upper end of the lower part of the plunger without gaps.
2. The liquid crystal dropping device according to claim 1, wherein an upper part of the plunger following the middle part of the plunger is formed in a truncated cone shape having an outer diameter of a lower end thereof equal to the outer diameter of the middle part of the plunger.