KR19980065156A - Liquid Crystal Injection Device - Google Patents

Abstract

The present invention can monitor the injection of liquid crystals to the liquid crystal cell and the incorporation of foreign substances, and at the same time, the liquid crystal injection can efficiently and completely clean the liquid crystal injection device without disassembling the piping and the like without manpower. It is for the purpose of providing a device.

The present invention provides an injection chuck (8) connected to the liquid crystal injection hole (4) of the liquid crystal cell (1), a liquid crystal tank (12) for liquid crystal storage, the liquid crystal tank (12) and the injection chuck (8). And a liquid crystal injection path having a pipe connecting therebetween, and having a liquid crystal monitor device (45) for monitoring liquid crystal in the liquid crystal injection path.

Description

Liquid Crystal Injection Device

The present invention relates to an apparatus for injecting liquid crystal into a gap between substrates of a liquid crystal cell.

FIG. 6 shows a distribution system of a conventional apparatus for injecting liquid crystal into the gap between the substrates of the liquid crystal cell, and FIG. 7 and FIG. 8 show the arrangement relationship of the liquid crystal injection unit with respect to the liquid crystal cell, which is indicated by reference numeral 1 in FIG. As shown in FIG. 8, it is a liquid crystal cell comprised by having a pair of transparent board | substrates 2 and 3 opposed.

The liquid crystal cell 1 is formed by integrating the substrates 2 and 3 in an opposite state by the blocking member 7 shown in FIG. 6 or 8 sandwiched in the periphery of the substrates 2 and 3, and at the same time, liquid crystal injection is performed. The liquid crystal injection hole 4 which is arrange | positioned in the standing length of the horizontal length, and is comprised by the part which does not arrange a blocking material in the center part of the one side (right side side of FIG. 8) in the sealing material of the peripheral part of the board | substrate 2,3 Are formed, and liquid crystal discharge ports 5 and 6 each formed of a portion in which no blocking material is disposed are formed at the upper and lower portions of the other side (the left side side in FIG. 8).

Outside the liquid crystal injection port 4, a U-shaped injection chuck 8 for preventing liquid crystal leakage is provided, and the same U-shaped discharge chucks 9 and 10 are also provided outside the liquid crystal discharge ports 5 and 6. Each is installed. These chucks 8, 9, and 10 are formed in a block shape having recesses (a) into which the ends of the liquid crystal cell (1) can be fitted, as shown in Fig. 7, and liquid crystal injection holes are formed inside the recesses (a). By attaching the recessed portion (a) to the periphery of the liquid crystal inlet or around the liquid crystal outlet of the liquid crystal cell (1), the inner injection hole and the liquid crystal inlet (a) of the recess (a) or the injection hole and the liquid crystal outlet (5, 6) It is configured to be connected to. In addition, in FIG. 6, these chuck | zipper 8, 9, 10 is described in flat form in order to simplify.

In addition, as shown in FIG. 6, a pressure feeding device 11 and a liquid crystal tank 12 are connected to the injection chuck 8, and a vacuum pump (suction means) 13 is connected to the pressure feeding device 11 and the liquid crystal tank 12. Is connected and the pressure regulator 15 is connected to the liquid crystal tank 12. In addition, a vacuum pump (suction means) 16 is connected to the discharge chucks 9 and 10 on the liquid crystal discharge ports 5 and 6 side.

Moreover, in the said liquid crystal cell 1, the sensor 17 for detecting the liquid crystal injection state around the liquid crystal injection opening 4 is provided in the side part of the injection chuck 8, and the liquid crystal cell 1 In the region between the liquid crystal discharge ports 5 and 6, a liquid crystal passage detection sensor 18 is provided.

Next, FIG. 9 shows the detailed structure of the piping system of the conventional liquid crystal injection device, and the pressure feeding device (pressure tank) 11 is connected to the inlet portion 8a of the injection chuck 8 via the connection pipe 22. The liquid crystal tank 12 is connected to the pressurizing device 11 via the connecting pipe 23, and the liquid crystal tank 12 is discharged 8h of the injection chuck 8 by the return pipe 24. Is connected to.

The pressure feeding device 11 includes a diaphragm 25 therein, the liquid crystal is accommodated in the lower side of the diaphragm 25, and the pressure chamber 11a on the upper side of the diaphragm 25 is pressed. It is connected to the regulator 15 via the connection pipe 26, and it is comprised so that a liquid crystal may be pumped to the injection chuck 8 side by adding air pressure to the pressurizing chamber 11a. In addition, the liquid crystal trap 29 is connected to the liquid crystal tank 12 via a connection pipe 28, and a vacuum pump (suction means) is provided in the pressure chamber 31 provided in the liquid crystal trap 29 via the piston member 30. (13) is connected.

Injecting liquid crystal into the liquid crystal cell 1 by using the liquid crystal injection device having the above-described configuration, first, the vacuum pump 16 is operated to depressurize the inside of the liquid crystal cell 1 and at the same time, the liquid crystal tank from the regulator 15. Pressure is applied to the pressure chamber 11a of (11) to inject the liquid crystal into the liquid crystal cell 1 via the injection chuck 8 and the liquid crystal injection port 4. Here, the gap between the substrates 2 and 3 of the liquid crystal cell 1 is very small (a few micrometers) so that the capillary phenomenon works, and thus the liquid crystal 20 injected into the liquid crystal cell 1 gradually becomes an image shown by the dashed-dotted line in FIG. 6. It is injected so as to spread from the liquid crystal injection port 4 side toward the liquid crystal discharge ports 5 and 6 side. In addition, the sensors 17 and 18 are operated at the start of the injection, and the sensor 17 monitors the state where the liquid crystal 20 is injected into the liquid crystal cell through the liquid crystal injection port 4, and at the same time, the sensor It is monitored whether the liquid crystal 20 injected by the 18 approaches liquid crystal discharge ports 5 and 6, and the liquid crystal 20 is filled in the liquid crystal cell 1 and discharged from the liquid crystal discharge ports 5 and 6 The liquid crystal injection is completed in the state where it became.

In the liquid crystal injection device having the above structure, when the injection operation to the liquid crystal cell 1 is finished, the injection chuck 8 and the discharge chucks 9 and 10 are removed from the liquid crystal cell 1 and the connection pipe 23 It is necessary to return the liquid crystal remaining inside to the pressure feeding device 11 or the liquid crystal tank 12. This is done for the purpose of preventing the extra components in the atmosphere, the glass powder from the liquid crystal cell 1, etc. from mixing into the liquid crystal, and for the purpose of preventing the liquid crystal from deteriorating in contact with the atmosphere. Moreover, the connection pipe which the liquid crystal passed through needs to perform washing | cleaning for the purpose of the removal of deteriorated liquid crystal and the removal of an unnecessary component regularly.

Such cleaning of the connection pipe is conventionally performed by removing the connection portion of each connection pipe to each apparatus and cleaning the removed connection pipe one by one, but this operation requires about half a day even if it is performed by two or three skilled workers. It is a complicated operation and the worker is heavy labor, so improvement was desired.

1 is a configuration diagram showing an example of a cleaning device for a liquid crystal injection device according to the present invention;

2 is an enlarged view illustrating main parts of the cleaning device shown in FIG. 1;

3 is a configuration diagram showing another example of the washing apparatus;

4 is a configuration diagram showing still another example of the washing apparatus;

5 is a view showing an example of a detachment mechanism between a liquid crystal cell and an injection chuck;

6 is a view showing a pipe path of a conventional liquid crystal injection device;

7 is a view showing the installation position of the connection portion and the sensor of the conventional liquid crystal injection apparatus for the liquid crystal cell,

8 is a view showing a connection state of a conventional liquid crystal injection device to a liquid crystal cell;

9 is a configuration diagram showing an example of a piping system of a conventional liquid crystal injection device;

※ Explanation of code for main part of drawing

1 liquid crystal cell 8 injection chuck

8a: inlet 8b: outlet

11 pressure feeding device 12 liquid crystal tank

13: vacuum pump (suction means) 22, 23: connection pipe

24: return pipe 35: switching valve (first switching valve)

38: switching valve (second switching valve) 40: bypass pipe

41, 42: switching valve 45, 45 ': liquid crystal monitor device

50: liquid feed pump (cleaning liquid supply) 51: cleaning liquid tank

52: liquid analyzer 54: drain discharger (cleaning liquid discharge device)

58: separation column 59: detector

60: data processing device

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is possible to monitor the liquid crystal injected into the liquid crystal cell, to prevent the mixing of foreign matters, and to clean the liquid crystal injection device without resorting to manpower without disassembling piping or the like. It is an object of the present invention to provide a liquid crystal injection device that can be efficiently and completely washed without being damaged.

The present invention has a liquid crystal injection path having an injection chuck connected to the liquid crystal injection hole of the liquid crystal cell, a liquid crystal storage liquid crystal tank, and a pipe connecting the liquid crystal tank and the injection chuck to solve the above problems, It also has a monitor device for monitoring the liquid crystal in the liquid crystal injection path.

In the above configuration, it is preferable that the liquid crystal monitor device has a liquid crystal detection device and a device for processing data detected by the liquid crystal detection device.

If the liquid crystal monitor device is provided, it is possible to monitor the liquid crystal during the liquid crystal injection and the cleaning state during the cleaning of the liquid crystal injection path. Moreover, the state of the detected liquid crystal can be grasped easily and reliably by data processing.

It is preferable that the said liquid crystal detection device is a liquid chromatography apparatus.

The liquid crystal injection path is connected to the injection chuck and the injection chuck via a connection pipe, and a pressure feeding device for feeding liquid crystal to the injection chuck, the liquid crystal tank connected to the pressure feeding device via a connection pipe, and connected to the liquid crystal tank. It is preferable to have a suction pipe and a return pipe provided by connecting the injection chuck and the liquid crystal tank.

By the injection path, the liquid crystal may be injected from the injection port of the liquid crystal cell through the injection chuck. In addition, the liquid crystal in the injection path can be returned to the liquid crystal tank through the return pipe by the suction means.

Next, it is preferable to provide a cleaning liquid supply device and a cleaning liquid discharge device in the liquid crystal injection path. As a result, the liquid crystal injection path can be cleaned by injecting and discharging the cleaning liquid into the liquid crystal injection path.

The connecting pipe and the return pipe are connected to a bypass pipe having an opening / closing valve, and the cleaning liquid supply device, the cleaning liquid discharge device, and the at least one of the connecting pipe, the return pipe, and the bypass pipe. It is preferable to connect the liquid crystal monitor device.

Thereby, the liquid crystal passing through any one of the connection pipe, the return pipe, and the bypass pipe can be monitored by the liquid crystal monitor device, and the cleaning state can be monitored during the cleaning of the injection path.

Next, in the above configuration, a first switching valve is provided in the connection pipe between the injection chuck and the pressure feeding device, and a second switching valve is provided in the connection pipe between the pressure feeding device and the liquid crystal tank. The liquid crystal monitor apparatus can be connected to the connection pipe between the first switching valve and the second switching valve.

According to this configuration, the liquid crystal remaining in the liquid crystal injection path after the liquid crystal injection operation can be easily discharged.

(Example)

Hereinafter, each embodiment of the present invention will be described in detail.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows an example of a liquid crystal injection device according to the present invention. In Fig. 1, the same reference numerals as those used in the description of the conventional liquid crystal injection device shown in Fig. 9 are the same elements, and thus description of these same elements. Is omitted.

In the apparatus of this example, a switching valve (first switching valve) 35 is incorporated in the connecting pipe 22 between the inlet portion 8a of the injection chuck 8 and the pressure feeding device 11, and the injection chuck Switch valves 36 and 37 are incorporated into the return pipe 24 between the discharge part 8b of the 8 and the liquid crystal tank 12, and the switch valve (second switch valve) is connected to the connecting pipe 23. (38) is incorporated. The switching valve 38 is connected to a liquid crystal tank (liquid crystal storage means) 12 via a return pipe 39.

Moreover, the switching valve 41 is incorporated in the connecting pipe 22 between the inlet part 8a of the injection chuck 8 and the switching valve 35, and the discharge part 8b of the injection chuck 8 The switching valve 42 is incorporated into the connecting pipe 24 between the switching valve 36, the both switching valves 41 and 42 are connected to the bypass pipe 40, and both switching valves 41 and 42 are connected. ), The injection chuck 8 is avoided and the connecting pipe 22 and the return pipe 24 can be communicated with each other. In addition, the liquid crystal monitor device 45 is connected to the connection pipe 23 between the pressure feeding device 11 and the switching valve 38.

As shown in FIG. 2, the liquid crystal monitor device 45 of this example is connected to the on / off valve 46 incorporated in the connecting pipe 23 and the connecting pipe 23 on the upstream side of the opening / closing valve 46. A liquid feed pump (cleaning liquid supply device) interwoven between the liquid feed pipe 47, the return pipe 48 connected to the downstream side of the on-off valve 46, and the liquid feed pipe 47 and the return pipe 48. (50), the cleaning liquid tank (51) for sending the cleaning liquid to the liquid feeding pump (50), the liquid analyzer (52) connected through the extraction pipe (49) in the middle of the return pipe (48), and the return pipe (48). The drain discharge part (cleaning liquid discharge device) 54 which was woven through the switching valve 53 in the middle), and the opening / closing valve 56 woven in the part near the connection pipe 23 of the return pipe 48, The main body is composed of an opening / closing valve 57 incorporated into a portion near the connecting pipe 23 of the liquid feeding pipe 47. The liquid analyzer 52 is connected to a detector 59 and a detector 59 such as a liquid chromatography device having a separation column 58 for separating the components of the liquid passing through the return pipe 48. The data processing apparatus 60 is comprised.

In the liquid crystal injection device having the above-described configuration, at the time of injecting the liquid crystal, the switch valves 41 and 42 are operated to communicate the connecting pipe 22 with the injection chuck 8 and the switch valve 42 is closed. By this, the liquid crystal can be injected into the liquid crystal cell 1 from the pressure feeding device 11 via the connection pipe 22 and the injection chuck 8. In addition, the switching valve 46 shown in FIG. 2 is open | released at the time of injecting liquid crystal, and the shut-off valves 56 and 57 are closed.

Next, in the cleaning of the liquid crystal injection device using the liquid crystal monitor device 45, the switching valves 41 and 42 shown in FIG. 1 are switched to block communication between the connecting pipe 22 and the injection chuck 8. Then, the return pipe 24 is directly communicated with the connecting pipe 22 via the bypass pipe 40 so as to close the circuit. The closed loop here is a connection pipe 22, a switching valve 41, a bypass pipe 40, a switching valve 42, a return pipe 24, switching valves 36 and 37, and a liquid crystal tank 12. ), The connecting pipe 23, the switching valve 38, and the pressure feeding device 11 are assumed to be closed loops.

Moreover, it is preferable to remove from the drain discharge part 54 by sending in gas, such as an inert gas, from the gas supply apparatus which connected the liquid crystal in the pressure feed apparatus 11 and the liquid crystal tank 12 separately before a washing | cleaning operation. In addition, prior to the above cleaning, the liquid crystal in the pressure feeding device 11 and the liquid crystal tank 12 is returned to the liquid crystal trap 29 through the switching valve 38, the return pipe 39, and the connection pipe 28. It can also be. This operation can be performed by operating the vacuum pump 12 to return the liquid crystal from the liquid crystal tank 12 to the liquid crystal trap 29.

Subsequently, the cleaning liquid is fed into the closed loop from the liquid crystal monitor device 45.

In order to transfer the cleaning liquid, the opening / closing valve 46 opened during the liquid crystal injection operation is closed, the opening / closing valves 56 and 57 are opened, and the selector valve 53 is switched to return the return pipe 47 to the drain discharge part. (54), the cleaning liquid is sent from the liquid feeding pump (50) to the connecting pipe (23) via the liquid feeding pipe (47), the inside of the closed loop is circulated from the connecting pipe (23), and the connecting pipe (23) is again connected. And returning to the return pipe 48, and sending a cleaning liquid from the selector valve 53 to the drain discharge part 54. FIG. By the above operation, the inner surface of the piping system in the closed loop, that is, the connecting pipe 22, the switching valve 41, the bypass pipe 40, the switching valve 42, the return pipe 24, the switching valves 36, 37 ), The inner surface of the liquid crystal tank 12, the connection pipe 23, the switching valve 38, and the pressure feeding device 11 can be cleaned with a cleaning liquid.

During the cleaning operation, the liquid analyzer 52 is operated to extract and analyze the liquid containing the cleaning liquid flowing inside the return pipe 48 from the separation column 58. According to this analysis result, in the initial stage of cleaning, a large amount of liquid crystal component is contained. However, as the cleaning proceeds, the liquid crystal component decreases, so that the component of the cleaning liquid is increased. As a result, residual liquid crystal components, impurities, foreign matters, and the like remaining in the closed loop can be completely removed.

In addition, it is preferable that the mixed liquid of the liquid crystal and the washing liquid discharged from the drain discharge part 54 is separated into the liquid crystal and the washing liquid by, for example, a (large capacity) purification column and used again.

By performing the above operation, it is possible to clean the piping system including the connection tube of the liquid crystal supply device without the need for separate operation of the connection tube conventionally performed and requiring the manpower of the skilled person. Moreover, since the washing | cleaning state can be grasped | ascertained by the liquid analyzer 52, washing | cleaning completion can be judged easily and a cleaning nonuniformity does not arise. In addition, since this cleaning operation can be performed at night, when the liquid crystal injection operation is performed in the middle of the day and the cleaning operation is performed at night, the cleaning operation can be easily performed without lowering the production efficiency of the daytime.

In addition, when the cleaning operation is completed, a gas such as an inert gas is supplied from a gas supply device that is separately connected to the closed loop to completely remove the cleaning liquid remaining on the inner surface of the closed loop, and then vacuum connected separately to the closed loop. It is preferable to operate the pump to vacuum degassing the inside of the closed loop, inject the liquid crystal into the liquid crystal tank after the completion of the drying operation, and perform liquid crystal injection into the liquid crystal cell 1 again.

In addition, the liquid crystal monitor device 45 is squeezed into the connecting pipe 22 between the first switching valve 35 and the second switching valve 38 so that the liquid crystal remaining in the closed loop (in the liquid crystal tank 11). Discharge of liquid crystals) can be facilitated.

Next, the liquid crystal during the injection operation can be monitored using the liquid crystal monitor device 45 having the above-described configuration.

That is, the on-off valve 46 is closed, the on-off valves 56 and 57 are opened, the switching valve 53 is switched, and the return pipes 47 and 48 are connected to each other. The liquid crystal injection operation is performed in the same manner as the injection operation. At this time, since the liquid crystal injected into the liquid crystal cell 1 also passes through the loop of the liquid crystal monitor device 45 through the connection pipe 23, the liquid crystal is periodically separated from the separation column 58 while passing through the loop. By extracting and separating, the liquid crystal passing through the connection pipe 23, ie, the liquid crystal injected into the liquid crystal cell 1, can be analyzed.

By analyzing the liquid crystals in the liquid crystal injection operation as described above, when foreign matters are mixed in the liquid crystal or the liquid crystal itself is deteriorated, they can be monitored and easily grasped. Therefore, the foreign material is not injected into the liquid crystal cell 1, and at the same time, the deteriorated liquid crystal is not injected into the liquid crystal cell 1. In addition, at this time, the data processing device 60 transmits the inspection data to the monitor so that the monitor can be easily grasped. There is a number.

3 and 4 show another example of the cleaning apparatus according to the present invention. In this example, the liquid crystal cell 1 simultaneously contains five liquid crystal cells 1 with respect to the injection apparatus described above with reference to FIGS. 1 and 2. It is a configuration that can be injected.

Therefore, in the structure of this example, five injection chucks 8 are provided in parallel, and each of these inlets 8a passes through the connecting pipe 22 and passes through the five-port switching valve 35 'to feed the pressure feeding device. Connected to (11), and the discharge portion 8b of each injection chuck 8 passes through the return pipe 24, through the five-port switching valve 36 ', and then again the return pipe 24' and the three ports. It is connected to the liquid crystal tank 12 via the switching valve 38 '. In addition, the liquid crystal monitor device 45 is connected to the connection pipe 23 in the same manner as in the above example.

Also in the apparatus of this example, of course, the liquid crystal can be injected and washed similarly to the above example.

Next, in this example, the place where the liquid crystal monitor device 45 is installed may be the connecting pipe 22 between the pressure feeding device 11 and the switching valve 35 'as indicated by the broken line in FIG. to be.

Further, in the present invention, the liquid crystal monitor device 45 'shown in FIG. 3 may be incorporated into the connecting pipe 22 instead of the pressure feeding device 11 surrounded by the dashed-dotted line in FIG. 4.

The liquid crystal monitor device 45 'of this example includes a liquid feeding tank 70, a cleaning liquid tank 71 for sending a cleaning liquid to the liquid feeding pump 70, a liquid crystal tank 72 for sending liquid crystals to the liquid feeding pump 70, A switching valve 73 for switching the connection between the cleaning liquid tank 71 and the liquid crystal tank 72 and the liquid supply pump 70, and a leak valve connected to the liquid crystal tank 72 via the switching valve 75; 76) is provided with the vacuum pump 77 of attachment.

By providing the liquid crystal monitor device 45 'shown in FIG. 3 instead of the pressure feeding device 11 shown in FIG. 4, the liquid sent to the connection pipe 22 can be easily switched to the switching valve 73 by the liquid crystal and the cleaning liquid. Therefore, by using the liquid crystal monitor device 45 'instead of the liquid crystal monitor device 45 shown in FIG. 4, the liquid crystal injection operation and the cleaning operation can be performed.

FIG. 5 shows an example of the attachment / detachment mechanism of the injection chucks 8, 9, 10 with respect to the liquid crystal cell 1.

In this example, the support chuck 81 is supported on one side of the liquid crystal cell 1 provided in a standing state on the mount 80 in a horizontal length so that the injection chuck 8 is supported on the other side. The upper and lower injection chucks 9 and 10 are respectively supported by the upper support member 82, and the support member 82 is approached to the liquid crystal cell along the horizontal direction by a rail member schematically shown. The cylinder device 84 is provided on the side of the support member 82, and the support member 82 is configured to be horizontally moved by the movement of the piston rod 85 of the cylinder device 84. have. That is, the injection chucks 9 and 10 are attached to and detached from the liquid crystal discharge ports 5 and 6 of the liquid crystal cell 1 by the operation of the cylinder device 84. In addition, the support member 81 of the injection chuck 8 is also freely horizontally moved by the piston rod 87 of the cylinder device 86, so that the injection chuck 8 is injected into the injection port 4 of the liquid crystal cell 1. This is detachable.

In the above configuration, the support members 81 and 82 can be pushed against the liquid crystal cell 1 by pushing the injection chucks 8, 9 and 10 against the liquid crystal cell 1, and at the same time, the support members 81 and 82 are supported. The injection chucks 8, 9, 10 can be separated from the liquid crystal cell 1 by separating the liquid crystal cell 1 from the liquid crystal cell 1.

Therefore, according to the apparatus of this example, the injection chucks 8, 9, and 10 can be attached and detached with respect to the liquid crystal cell 1 automatically, and the liquid crystal injection operation to the liquid crystal cell 1 can be reduced.

In addition, although the structure of the above-mentioned example demonstrated the example which provided one liquid crystal injection port and two liquid crystal discharge ports with respect to a liquid crystal cell, the number and position in the case of providing these are not specifically limited. Further, the shape of the chuck is not limited to that shown in the drawing, and the yaw may be appropriately used as the structure in which the liquid crystal does not leak at the openings of the inlet and outlet.

As described above, according to the present invention, since the liquid crystal monitor device for monitoring the liquid crystal in the path is provided in the liquid crystal injection path having a pipe connecting the injection chuck and the liquid crystal tank, the liquid crystal injection operation for the liquid crystal cell or the liquid crystal injection. By monitoring the liquid crystal in the injection path at the time of cleaning of the path, it is possible to prevent the incorporation of foreign matters during the liquid crystal injection operation, to grasp the degradation of the liquid crystal, and to prevent the deterioration of the liquid crystal into the liquid crystal cell.

Moreover, by providing a data processing apparatus in the liquid crystal monitor device, it is possible to easily and reliably perform data processing of foreign matter mixing, data processing of liquid crystal deterioration, and data processing of grasping state of the cleaning liquid at the time of washing. Moreover, it is preferable that the liquid crystal detection apparatus with which a liquid crystal monitor apparatus is equipped is a liquid chromatography apparatus, and if it is this apparatus, mixing of a foreign material, deterioration of a liquid crystal, and the state of a washing | cleaning liquid can be grasped reliably.

In addition, by providing the cleaning liquid supply device and the cleaning liquid discharge device in the liquid crystal injection path, the cleaning liquid can be supplied and discharged to the liquid crystal injection path, and the liquid crystal injection path can be cleaned.

Next, by connecting the connecting pipe and the return pipe with a bypass pipe having an opening / closing valve, a loop can be formed between the connecting pipe, the bypass pipe and the return pipe, and the liquid crystal injection path is cleaned by flowing the cleaning liquid through the loop. You can do it. The cleaning state can be grasped by monitoring the cleaning liquid with a liquid crystal monitor device.

In the above configuration, a first switching valve is provided in the connection pipe between the injection chuck and the pressure feeding device, and a second switching valve is provided in the connection pipe between the pressure feeding device and the liquid crystal tank to provide a liquid crystal monitor device. The liquid crystal remaining in the liquid crystal injection path can be easily discharged by the configuration made by connecting to the connecting pipe between the first switching valve and the second switching valve.

Claims (7)

And a liquid crystal injection path having an injection chuck connected to a liquid crystal injection hole of a liquid crystal cell, a liquid crystal tank for liquid crystal storage, and a pipe connecting the liquid crystal tank and the injection chuck, and to monitor the liquid crystal in the liquid crystal injection path. A liquid crystal injection device having a liquid crystal monitor device. The method of claim 1, And said liquid crystal monitor device has a liquid crystal detection device and a device for processing data detected by said liquid crystal detection device. The method of claim 1, And said liquid crystal detecting device is a liquid chromatography device. The method of claim 1, The liquid crystal injection path is connected to the injection chuck and the injection chuck via a connection pipe, and a pressure feeding device for feeding liquid crystal to the injection chuck, the liquid crystal tank connected to the pressure feeding device via a connection pipe, and connected to the liquid crystal tank. And a return pipe provided by connecting the suction means and the injection chuck and the liquid crystal tank. The method of claim 1, And a cleaning solution supply device and a cleaning solution discharge device are provided in the liquid crystal injection path. The method of claim 4, wherein The connecting pipe and the return pipe are connected to each other by a bypass pipe having an on / off valve, and the cleaning liquid supply device, the cleaning liquid discharge device, and the liquid crystal monitor device are connected to at least one of the return pipe and the bypass pipe. Liquid crystal injection device, characterized in that. The method of claim 6, The first switching valve is installed in the connection pipe between the injection chuck and the pressure feeding device, and the second switching valve is installed in the connection pipe between the pressure feeding device and the liquid crystal tank, and the liquid crystal monitor device is provided. A liquid crystal injection device, characterized in that connected to the connecting pipe between the first switching valve and the second switching valve.