KR20120111879A - Application method for application liquid and application apparatus - Google Patents

Abstract

PURPOSE: A coating method of coating liquid and a coating apparatus are provided to accurately control the flux of the coating liquid from each branched pipe by correcting a standard flow meter. CONSTITUTION: A coating method of coating liquid includes the following: a standard flow meter is corrected(S1); a branched pipe is selected(S2); a first relational expression is obtained(S3); a second relational expression is obtained(S4); first and second relational expressions are obtained from every branched pipe(S5); each flux controlling valve for the branched pipes is adjusted(S6); and coating liquid is coated(S7). The first relational expression represents the relation between the fluxes of a standard flow meter at a main pipe and a branched pipe flow meter at a branched pipe with coating liquid. The second relational expression represents the relation between the fluxes of branched pipe flow meters at the branched pipe with coating liquid and a corresponding branched pipe. [Reference numerals] (AA) Start; (BB) End; (S1) Correcting a standard flow meter; (S2) Selecting a branched pipe; (S3) Generating a first relational expression; (S4) Generating a second relational expression; (S5) Every branched pipe?; (S6) Adjusting a flux controlling valve; (S7) Coating a coating liquid

Description

Coating liquid application method and coating device {APPLICATION METHOD FOR APPLICATION LIQUID AND APPLICATION APPARATUS}

This invention is a coating liquid which apply | coats a coating liquid to board | substrates, such as the glass substrate for organic electroluminescent display devices, the glass substrate for liquid crystal display devices, the glass substrate for PDPs, the solar cell substrate, the substrate for electronic paper, or the mask substrate for semiconductor manufacturing apparatuses. It relates to a coating method and a coating device.

For example, when manufacturing an active matrix drive type organic EL display device using a polymer organic EL (Electro Luminescence) material, a step of forming a thin film transistor (TFT) circuit for a glass substrate, and ITO (Indium) serving as an anode Tin Oxide) electrode formation step, partition wall formation step, flowable material containing hole transporting material, hole transporting layer forming step by heat treatment, flowable material containing organic EL material, heat treatment The organic EL layer formation step, the cathode formation step, and the sealing step by formation of the insulating film are sequentially performed.

In the manufacture of such an organic EL display device, a coating apparatus for applying a coating liquid, such as a fluid material containing a hole transport material or a fluid material containing an organic EL material, to a substrate, wherein the plurality of nozzles continuously discharge the coating liquid. The apparatus which apply | coats a coating liquid in stripe form to the application | coating area | region on a board | substrate is known by moving relatively to the main scanning direction and the subscanning direction with respect to a board | substrate.

By the way, in such a coating apparatus, when there exists a deviation in the application amount of a coating liquid, since the display unevenness of a display apparatus arises by this, it is necessary to control the application amount of a coating liquid very accurately.

To this end, Patent Literature 1 discloses a branch portion for classifying a supply portion for supplying a coating liquid, a plurality of nozzles for discharging the coating liquid, and a plurality of branch pipes connected to the nozzles with the coating liquid supplied from the processing liquid supply portion through the main pipe. And a reference flow meter installed in the main building and measuring flow rates of the coating liquid flowing through the main building, a plurality of branch pipe flow meters installed in the branch pipe respectively and measuring flow rates of the coating liquid flowing through each branch pipe, and installed in the branch pipe, respectively. In the coating apparatus provided with the some flow control valve which adjusts the flow volume of the coating liquid which flows each branch pipe, WHEREIN: The relation which shows the relationship of the real discharge flow volume and the flow rate measurement value of a reference flow meter, the flow rate measurement value of a reference flow meter, and a branch pipe An application formula that obtains a relational expression indicating a relationship between flow rate measurement values of the flowmeters and controls the flow control valve using these relational expressions. It is disclosed.

Japanese Patent Publication No. 2009-45574

Although the coating device of patent document 1 mentioned above is the outstanding thing which can manage the flow volume of the coating liquid discharged from each nozzle easily, there is still room for improvement from the following points. That is, the flow rate control valve mentioned above differs in the flow rate set value and the real flow volume value by the error of the individual characteristic at the time of manufacture, and according to the individual difference of this flow control valve, the flow rate set value at the time of flow control and actual An error occurs between the flow rate values. The occurrence of such an error causes a variation in the film thickness of the coating liquid, whereby a luminance variation of the display device occurs, resulting in a problem of lowering the display quality.

This invention is made | formed in order to solve the said subject, and an object of this invention is to provide the coating liquid application | coating method and coating apparatus which can control the application amount of a coating liquid correctly.

The invention according to claim 1 includes a plurality of coating liquid storage portions for storing the coating liquid, a plurality of nozzles for discharging the coating liquid, and a coating liquid supplied from the coating liquid storage portion through the main pipe to the nozzles. A branch flow rate which is divided into branch pipes, a reference flow meter installed in the main pipe to measure the flow rate of the coating liquid flowing through the main pipe, and a plurality of branch flow meters which are respectively provided in the branch pipe and measure the flow rate of the coating liquid flowing through the respective pipes. Operation of each said flow control valve based on the branch pipe flowmeter, the some flow control valve provided in the said branch pipe, respectively, and adjusting the flow volume of the coating liquid which flows through each said branch pipe, and the flow value measured by each branch pipe flowmeter. A coating liquid coating method in a coating device for applying a coating liquid to a substrate, wherein the coating liquid is stored in the coating liquid storage unit. The relationship between the flow rate value indicated by the reference flow meter installed in the main tube when supplied to only one branch pipe of the plurality of branch pipes through the main tube, and the flow rate value indicated by the branch pipe flow meter provided in the branch pipe to which the coating liquid is supplied. The paper tube to which the coating liquid was supplied when the 1st relation formula preparation process which calculates the 1st relation formula which shows, and the coating liquid stored in the said coating liquid storage part were supplied only to one branch pipe of the said plurality of branch pipes through the main tube. A second relation formulating step for obtaining a second relation formula for displaying a relationship between the flow rate set value of the flow control valve provided in the valve and the flow rate value indicated by the branch pipe flow meter installed to flow through the branch pipe, the first relation formula making step and the second relation formula making step Is a branch changing step which is sequentially executed with respect to another branch among a plurality of branch pipes, and Based on the said 1st relation formula and the said 2nd relation formula which were created, the coating process of supplying a coating liquid to a board | substrate by controlling the flow control valve of each said branch pipe is characterized by the above-mentioned.

In the invention according to claim 2, in the invention according to claim 1, in the first relational expression creating step, the coating liquid stored in the coating liquid storage unit is supplied only to one branch pipe of the plurality of branch pipes through the main tube. The operation to change is repeated several times by changing the opening degree of the said flow control valve.

In the invention according to claim 3, in the invention according to claim 2, in the second relational expression creating step, the coating liquid stored in the coating liquid storage unit is supplied only to one branch pipe of the plurality of branch pipes through the main tube. The operation to change is repeated several times by changing the opening degree of the said flow control valve.

In the invention according to claim 4, in the invention according to any one of claims 1 to 3, the weight of the coating liquid that has passed through the main pipe and the flow rate value measured by the reference flow meter at that time before the second relational expression creating step. Based on this, a calibration step of performing calibration of the reference flow meter is provided.

Invention of Claim 5 is a coating apparatus which apply | coats a coating liquid to a board | substrate, Comprising: The coating liquid storage part which stores the said coating liquid, the some nozzle which discharges the said coating liquid, and the said coating liquid storage part through a main tube. It is provided in the branch part which classifies the coating liquid supplied into the some branch pipe connected to the said nozzle, the reference flowmeter which is provided in the said main pipe, and measures the flow volume of the coating liquid which flows through this main pipe, and the said branch pipe, respectively. A plurality of branch pipe flow meters for measuring the flow rate of the coating liquid flowing through the respective branch pipes, a plurality of flow control valves respectively provided in the branch pipes to adjust the flow rate of the coating liquid flowing through the branch pipes, and each branch pipe flow meter The control part which controls the operation | movement of each said flow control valve based on the flow volume value measured by the said control part, The said control part is the coating liquid supplied to the said main building, The flow rate value indicated by the reference flow meter measured while being supplied only to a single branch pipe selected from the pipe and the supply of the coating liquid to the other branch is closed, and the flow rate value indicated by the branch pipe flow meter provided in the branch pipe to which the coating liquid is supplied. Said flow volume based on the 1st relational expression which shows a relationship, and the flow rate set value of the flow control valve provided in the branch pipe to which the said coating liquid was supplied, and the 2nd relational formula which shows the relationship between the flow rate value represented by the branch pipe flowmeter provided in the said branch pipe. Control the control valve.

In the invention according to claim 6, in the invention according to claim 5, the calibration branch pipe branching from the branching portion, the opening / closing valve provided in the calibration branch pipe, and the coating liquid supplied to the main tube are provided only in the calibration branch pipe. And a container receiving the coating liquid discharged from the calibration paper tube in a state in which the supply of the coating liquid to the other branch pipe is abolished, and an electronic balance for measuring the weight of the container and the coating liquid stored therein, A reference flow rate calibration mechanism for calibrating the reference flow meter is provided.

According to invention of Claim 1 and 5, even if there is individual difference in a branch pipe flowmeter, it becomes possible to control the application amount of a coating liquid very accurately.

According to invention of Claim 2, it becomes possible to make a 1st relational expression more accurate.

According to invention of Claim 3, it becomes possible to make a 2nd relational expression more accurate.

According to invention of Claim 4 and Claim 6, by calibrating a reference flowmeter, it becomes possible to control the flow volume of the coating liquid apply | coated from each branch pipe correctly.

1 is a plan view of a coating apparatus according to the present invention.
2 is a front view of the coating apparatus according to the present invention.
3 is a sectional view of the vicinity of the slider 31 in the head moving mechanism 21.
It is a block diagram which shows the main control system of the coating device which concerns on this invention.
FIG. 5: is a schematic diagram which shows the structure of the coating liquid supply part 24 and the connection relationship of the coating liquid supply part 24 and the some nozzle 23 in the application head 20. As shown in FIG.
6 is a schematic diagram of the calibration unit 52.
It is a flowchart which shows each process of the coating liquid application | coating method which concerns on this invention.
8 is a flowchart showing a calibration stroke of the reference flowmeter 42.
It is explanatory drawing which shows the weight measurement operation | movement of coating liquid.
10 is a flowchart showing a first relational expression creating stroke.
FIG. 11: is a graph which shows the relationship between the flow volume value F which the reference flowmeter 42 shows, and the flow volume value f which the branch pipe flowmeter 45 shows.
12 is a flowchart showing a second relational expression creating stroke.
FIG. 13 is a graph showing the relationship between the flow rate set value x of the flow rate control valve 44 and the flow rate value f indicated by the branch pipe flow meter 45.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a plan view of the coating apparatus according to the present invention, and FIG. 2 is a front view thereof.

This coating device is for applying the coating liquid to the rectangular glass substrate 100. More specifically, this coating device is a glass substrate 100 for organic EL (Electro Luminescence) display device of the active matrix drive system, a volatile solvent (in this embodiment, an aromatic organic solvent), and light emission It is for apply | coating the coating liquid containing the organic electroluminescent material as a material.

This coating device is provided with the substrate movement mechanism 11 for moving the glass substrate 100. This board | substrate movement mechanism 11 has the board | substrate holding part 10 which holds the glass substrate 100 from the back surface, as shown in FIG. This board | substrate holding part 10 is supported by the base 13 which moves along a pair of rail 12, and the swivel table 14 provided on this base 13. As shown in FIG. For this reason, this board | substrate holding part 10 is movable in parallel with the surface of the glass substrate 100 in the Y direction shown in FIG. This Y direction is a direction orthogonal to the main scanning direction (X direction in FIG. 1) which is the reciprocating direction of the application head 20. FIG. Hereinafter, this Y direction is also called "sub scanning direction." Moreover, this board | substrate holding part 10 is rotatable about the axis | shaft toward a perpendicular direction (Z direction in FIG. 1).

This board | substrate holding part 10 is equipped with the heater which heats the glass substrate 100 from the lower side inside. On the surface of this glass substrate 100, the some application | coating area | region which each extends in an X direction is formed in the Y direction at the pitch of 100-150 micrometers, for example. This application | coating area | region is formed by the partition etc. which are arrange | positioned in the X direction, for example.

In addition, the coating device captures and detects alignment marks (not shown) formed on the glass substrate 100, and the pair of left and right imaging units 15 for picking up the coating trace by the coating head 20. It is provided. The pair of imaging units 15 is provided with CCD cameras, respectively. In addition, the coating device includes a pair of left and right test coating stages 16 used for the test coating of the coating trace. In this coating device, the structure which adjusts the feed control of the coating head 20 is employ | adopted using the application | coating trace | coated to the test application | coating stage part 16 experimentally.

The coating head 20 which discharges a coating liquid toward the surface of the glass substrate 100 hold | maintained at the board | substrate holding part 10 is a glass substrate (with the guide part 22 by the head moving mechanism 21). 100) It reciprocates in the main scanning direction (X direction in FIG. 1) parallel to a surface. In this coating head 20, a plurality of nozzles 23 for continuously discharging the same kind of coating liquid are provided at equal intervals in the sub-scan direction. 1 and 2 show only five nozzles 23 for convenience of illustration, and the number of nozzles 23 is larger.

The coating head 20 is connected to the coating liquid supply part 24 and the air supply source 25 via the air supply pipe | tube and the supply pipe group 26 which gathered several branch pipe mentioned later. On both sides of the substrate holding portion 10 with respect to the reciprocating direction (X direction) of the coating head 20, two fluid parts 17 receiving the coating liquid from the nozzle 23 in the coating head 20, 18) is installed. Moreover, the nozzle pitch adjustment mechanism for adjusting the pitch of the sub-scanning direction of the some nozzle 23 mentioned above in the side of one fluid part 18 regarding the reciprocating direction (X direction) of the application head 20. As shown in FIG. (19) is provided.

3 is a sectional view of the vicinity of the slider 31 in the head moving mechanism 21.

The slider 31 is slidably provided in the guide member 22 in the head movement mechanism 21 shown in FIG. The slider 31 is provided with a through hole 32 through which the guide member 22 penetrates. As shown in FIG. 1, the slider 31 is supplied with air of a constant pressure from the air supply source 25 through the air supply pipe included in the supply pipe group 26. For this reason, as shown in FIG. 3, air blows off between the inner peripheral surface of the through hole 32, and the outer peripheral surface of the guide part 22. As shown in FIG. In FIG. 3, the direction of blowing of air is shown by the arrow which attaches to code | symbol A1. As a result, the slider 31 is movably supported in the main scanning direction while being engaged with the guide portion 22 in a non-contact state.

Referring to FIG. 1, a pair of pulleys 33 rotatable about an axis in the Z-axis direction are provided near both end portions of the guide portion 22. An endless synchronous belt 34 is wound around this pair of pulleys 33. One end of the slider 31 is fixed to this synchronous belt 34. On the other hand, the application head 20 mentioned above is being fixed to the other end of the slider 31. For this reason, the application | coating head 20 can be reciprocally moved to (-X) direction or (+ X) direction by rotating the synchronous belt 34 clockwise or counterclockwise rotation by the drive of the motor which is not shown in figure. At this time, the slider 31 can be supported in a non-contact state with respect to the guide portion 22 by the action of the above-described gas, so that the reciprocating movement of the application head 20 can be smoothly and at high speed. .

In this coating device, the head moving mechanism 21 becomes a main scanning direction moving mechanism for moving the coating head 20 in the main scanning direction, and the substrate moving mechanism 11 moves the substrate holding part in the sub scanning direction. It becomes a sub scanning direction moving mechanism for moving. In this coating device, each time the movement of the coating head 20 in the main scanning direction is completed, the glass substrate 100 is moved in the sub-scanning direction, so that the coating is applied to the coating area of the surface of the glass substrate 100. Application of the liquid is performed. In addition, at the time of the main scanning of the coating head 20, acceleration or deceleration is completed in the vicinity of the fluid parts 17 and 18, and above the glass substrate 100, the coating head 20 is, for example. It moves at a constant speed of 3 ~ 5m every second.

In the coating apparatus which has the above structures, when starting application | coating of a coating liquid, the glass substrate 100 is hold | maintained at the board | substrate holding part 10 initially. And the alignment mark formed in the glass substrate 100 is detected by the imaging part 15, the board | substrate holding part 10 moves and rotates based on the detection result, and the glass substrate 100 is shown in FIG. It is arrange | positioned at the application | coating start position shown by a solid line. In this state, discharge of the coating liquid is started from the plurality of nozzles 23 in the coating head 20, and the coating head 20 is moved in the main scanning direction by the head moving mechanism 21.

Then, the coating liquid is continuously discharged from each of the plurality of nozzles 23 toward the surface of the glass substrate 100 at a constant flow rate, and the coating head 20 continuously moves at a constant speed in the main scanning direction, The coating liquid is applied in a stripe shape to a plurality of linear regions of the coating region of the glass substrate 100.

In this way, the application | coating head 20 moves to the standby position which opposes the infusion part 18 shown by the dashed-dotted line in FIG. 1 and FIG. 2, and the stripe-shaped pattern by coating liquid is formed. When the application head 20 moves to the standby position, the substrate moving mechanism 11 is driven, and the glass substrate 100 moves in the sub-scanning direction together with the substrate holding part 10. At this time, the coating liquid 20 continuously discharges the coating liquid from the plurality of nozzles 23 toward the fluid receiving portion 18.

The above operation is continued until the required coating operation is completed. And when the glass substrate 100 moves to the application | coating end position, discharge of the coating liquid from the some nozzle 23 will stop and the application | coating operation | movement of the coating liquid to the glass substrate 100 by a coating apparatus will complete | finished. . The glass substrate 100 after application | coating is conveyed to another coating apparatus etc., and the coating liquid of 2 colors other than the coating liquid apply | coated by this coating apparatus is apply | coated. And after a predetermined | prescribed coating process is performed with respect to the glass substrate 100, it combines with another component and an organic electroluminescence display is manufactured.

4 is a block diagram showing a main control system of the coating apparatus according to the present invention.

This coating apparatus is equipped with the control part 60 which controls the whole apparatus. This control part 60 is connected with the board | substrate movement mechanism 11, the rotating table 14, and the head movement mechanism 21 mentioned above. Moreover, this control part 60 is the flow control valve 40, the reference flowmeter 42, the flow control valve 44, the branch pipe flowmeter 45, the opening / closing valve 46 in the coating liquid supply part 24, It is connected with the on-off valve 51 and the correction part 52. In addition, although illustration is abbreviate | omitted, this control part 60 is equipped with the memory part comprised by RAM, ROM, etc. for performing various operations mentioned later, and the calculating part comprised by CPU etc. As this control part 60, a general personal computer may be used and this control part may be comprised with a printed board etc. In addition, the structure of the reference flowmeter 42, the flow control valve 44, the branch pipe flowmeter 45, the opening-closing valve 46, the opening-closing valve 51, the correction part 52, etc. is demonstrated later.

Next, the structure of the supply mechanism of the coating liquid which is a characteristic part of this invention is demonstrated. FIG. 5: is a schematic diagram which shows the structure of the coating liquid supply part 24 and the connection relationship of the coating liquid supply part 24 and the some nozzle 23 in the application head 20. As shown in FIG.

The coating liquid supply part 24 in the coating device which concerns on this invention is the flow control valve 40, the coating liquid storage part 41, the reference flowmeter 42, the manifold 43 as a branch part, , A plurality of flow control valves 44a, 44b, 44c… 44n, a plurality of branch pipe flowmeters 45a, 45b, 45c… 45n, a plurality of open / close valves 46a, 46b, 46c… 46n, and open / close valves ( 51 and a calibrator 52 to be described later. Each on-off valve 46a, 46b, 46c ... 46n is connected with the some nozzle 23a, 23b, 23c ... 23n in the application head 20, respectively.

In addition, in this specification, as needed, the some flow control valve 44a, 44b, 44c ... 44n is generically referred to as the flow control valve 44, and the several branch pipe flowmeters 45a, 45b, 45c ... 45n are replaced. Collectively, the branch pipe flow meter 45 collectively refers to the plurality of open / close valves 46a, 46b, 46c .. 46n, and collectively refers to the open / close valve 46, the nozzles 23a, 23b, 23c. )

In addition, in this specification, the pipeline before branching from the coating liquid storage part 41 to the manifold 43 via the flow control valve 40 and the reference flowmeter 42 is called main building. In addition, in this specification, each flow control valve 44a, 44b, 44c ... 44n from each manifold 43, each branch pipe flowmeter 45a, 45b, 45c ... 45n, and each open / close valve 46a, 46b, 46c ... The branched pipe line reaching the nozzles 23a, 23b, 23c ... 23n through 46n is called a branch pipe. In this coating device, a plurality of branch pipes corresponding to a? N exist. In this specification, the pipe from the manifold 43 to the straightening portion 52 via the opening / closing valve 51 is called a straight branch pipe.

The coating liquid storage part 41 has the structure which accommodated the flexible bag-shaped container which stored the coating liquid in the airtight chamber, and supplies the coating liquid to the flow control valve 40 and the reference flowmeter by supplying pressurized air in the airtight chamber. 42) and a configuration for feeding pressure toward the manifold 43 or the like. Moreover, the reference flowmeter 42 has a structure which measures the flow volume of the coating liquid discharged from the coating liquid storage part 41, and flowing into the manifold 43. As shown in FIG. As the reference flow meter 42, a thermal flow meter which measures the flow rate of the coating liquid using a heater and a temperature sensor provided in the flow path of the coating liquid is used. The measured value of the flow volume by this reference flowmeter 42 is transmitted to the control part 60 shown in FIG.

Each flow control valve 44 receives a command from the control part 60 shown in FIG. 4, and adjusts the flow volume of the coating liquid which flows through each branch pipe. Moreover, each branch pipe flowmeter 45 measures the flow volume of the coating liquid which flows through each branch pipe. As this branch pipe flowmeter 45, like the reference flowmeter 42, the thermal flowmeter which measures the flow volume of a coating liquid using a heater and a temperature sensor is used. The measured value of the flow volume by this branch pipe flowmeter 45 is transmitted to the control part 60 shown in FIG. These flow control valves 44 and branch pipe flow meters 45 constitute a mass flow controller. Moreover, each open / close valve 46 receives the instruction | command from the control part 60 shown in FIG. 4, and opens or closes the flow path of each branch pipe. Similarly, the opening / closing valve 51 receives an instruction from the control part 60 shown in FIG. 4, and opens or closes the flow path of the branch pipe for calibration from the manifold 43 to the correction part 52.

6 is a schematic diagram of the calibration unit 52 described above.

This correction part 52 is equipped with the container 53 in which the coating liquid was previously stored. This container 53 is mounted on the electronic balance 54 arranged on the support part 59 of the coating device. The electronic balance 54 and the container 53 are housed in the chamber 55. The lid 56 is disposed above the container 53. This lid 56 is connected to the chamber 55 via the connecting member 58, and is arrange | positioned in the position spaced apart by the micro distance from the upper end of the container 53. As shown in FIG. The distal end portion of the branch paper for calibration that extends from the open / close valve 51 shown in FIG. 5 to the correction section 52 is connected to a metal tubular pipe 57. As shown in FIG. 6, this metal tubular pipe 57 penetrates into the container 53 through the chamber 55 and the lid 56. The tip end of the tubular pipe 57 is immersed in the coating liquid stored in the container 53. In addition, in this figure, the code | symbol L represents the liquid level of the coating liquid stored in the container 53 before performing the correction | amendment operation mentioned later, and the code | symbol H shows the case where the coating liquid was stored to the limit in the container 53 to the limit. The liquid level of the coating liquid is shown. The electronic balance 54 measures the weight of the container 53 and the coating liquid stored therein.

Next, the application | coating operation | movement of the coating liquid by the coating apparatus which has the above structures is demonstrated. 7 is a flowchart showing each step of the coating liquid applying method according to the present invention.

Initially, the reference flowmeter 42 is calibrated (step S1).

8 is a flowchart showing a calibration stroke of the reference flowmeter 42. Calibration of the reference flowmeter 42 is performed by the process shown in FIG.

That is, first, the on-off valve 51 shown in FIG. 4 is opened. At this time, pressurized air at a predetermined pressure is supplied to the coating liquid storage part 41, and the coating liquid is capable of being fed toward the manifold 43 through the flow control valve 40 and the reference flow meter 42. have. In addition, the opening / closing valve 46 in each branch pipe is previously closed. Thereby, the coating liquid is pumped from the coating liquid storage part 41 toward the calibration part 52 via the flow control valve 40 reference flow meter 42, the manifold 43, and the opening / closing valve 51. In the calibration unit 52 shown in FIG. 6, the pressurized coating liquid is discharged from the metal tubing 57 into the coating liquid in the container 53 (step S11).

Then, the flow rate value indicated by the reference flow meter 42 when the coating liquid is discharged to the container 53 is obtained (step S12). This flow rate value is transmitted to the control part 60 shown in FIG. In addition, the weight of the coating liquid discharged in the container 53 is measured by the electronic balance 54 (step S13). The weight of the discharged coating liquid is the electronic balance after the total value of the weight of the container 53 measured by the electronic balance 54 before the coating liquid and the coating liquid stored therein and the coating liquid are discharged. It is measured by the difference between the total value of the container 53 measured by 54 and the weight of the coating liquid stored therein. The measured weight of the discharged coating liquid is transmitted from the calibration unit 52 to the control unit 60 shown in FIG. 4.

9 is an explanatory diagram showing a weight measurement operation of the coating liquid at this time.

In this case, the amount of change in the weight (dw) per unit time (dt) of about 1 second, for example, after the waiting time (tO) of about 5 seconds has elapsed from the start of the discharge until the discharge amount is stabilized. ), The weight (dw / dt) of the coating liquid flowing per unit time is measured. This is repeated, for example, ten times, and by averaging ten data obtained in ten seconds, data of the weight of the coating liquid which flowed per unit time is obtained. And this operation | movement is performed by the required number of times, for example about 3 to 5 times instead of a flow volume value by adjusting the flow control valve 40 (step S14). Here, wO in FIG. 9 has shown the initial weight which is the sum total of the weight of the container 53 and the coating liquid initially stored there.

In addition, instead of setting the unit time dt to about 1 second as described above, 10 data may be obtained for 50 seconds. In this case, it becomes possible to measure a more accurate weight by taking into account the responsiveness of the electronic balance 54. However, while a long time is required for weight measurement, the amount of the coating liquid consumed increases. In addition, you may perform said operation | movement more times than 3 to 5 times by changing the flow volume of a coating liquid. Also in this case, although the measurement accuracy improves, the measurement time and the consumption amount of the coating liquid increase.

Next, calibration is executed (step S15). That is, based on the weight of the coating liquid which flowed per unit time measured by the electronic balance 54 and the specific gravity of the coating liquid by the control part 60 shown in FIG. 4, of the coating liquid which passed the reference flowmeter 42, Calculate the actual flow rate. Then, the actual flow rate and the flow rate value indicated by the reference flow meter 42 are compared. After this, the reference flowmeter 42 is adjusted so that the flow rate value indicated by the reference flow meter 42 and the actual flow rate value coincide. Thereby, it becomes possible to match the flow volume value which the reference flowmeter 42 shows with the actual flow volume value of a coating liquid.

Again, referring to FIG. 7, next, when one of the plurality of branch pipes is selected (step S2), the flow rate value and the coating liquid indicated by the reference flow meter 42 when the coating liquid is supplied only to the one branch pipe are When the first relational formula creation process (step S3) for obtaining the first relational expression indicating the relation between the flow rate values indicated by the branch pipe flowmeters 45 of the branch pipe supplied and the coating liquid were supplied to only one branch pipe, the coating liquid A second relational expression creating process (step S4) is performed to obtain a second relational expression indicating a relationship between the flow rate set value of the flow rate control valve 44 of the branch pipe supplied and the flow rate value indicated by the branch pipe flowmeter 45 provided in the branch pipe.

10 is a flowchart showing a first relational expression creation process. The first relational expression creating step is performed by the step shown in this FIG. 10.

That is, first, the flow volume of a coating liquid is set (step S31). In this case, by the control of the control part 60, the flow control valve 44 of the branch pipe | tube is adjusted so that the flow volume value shown by the branch pipe flowmeter 45 of the selected branch pipe may become a preset target value. And the open / close valve 46 of the selected branch pipe is opened by the command of the control part 60. As shown in FIG. At this time, the opening / closing valve 46 of the branch pipes other than the selected branch pipe is closed.

In this state, the nozzle (from the coating liquid storage part 41 through the reference flow meter 42, the manifold 43, the flow control valve 44 of the selected branch pipe, the branch pipe flow meter 45, and the opening / closing valve 46). The coating liquid is sent to 23, and the coating liquid is discharged from the nozzle 23 (step S32). The flow rate value measured by the reference flow meter 42 at this time is acquired (step S33), and the flow rate value measured by the branch pipe flow meter 45 of the selected branch pipe is obtained (step S34). These acquired flow values are transmitted to the control part 60.

And the flow volume of a coating liquid is set again until the required process is complete | finished (step S35) (step S31). That is, the flow value shown by the branch pipe flowmeter 45 of the selected branch pipe under control of the control unit 60 is a value corresponding to the flow rate value of the coating liquid when the coating liquid is actually applied to the glass substrate 100. The flow rate control valve 44 of the branch pipe is adjusted so that the flow rate value is different from the flow rate value in the previous coating liquid discharging step (step S32). Then, the coating liquid discharge step (step S32), the flow rate value acquisition step (step S33) of the reference flow meter, and the flow rate value acquisition step (step S34) of the branch pipe flowmeter are repeatedly executed.

In other words, the relationship between the flow rate value indicated by the reference flow meter 42 and the flow rate value indicated by the branch pipe flow meter 45 is a plurality of points that are close to the flow rate value of the coating liquid when the coating liquid is actually applied to the glass substrate 100 ( For example, 3 to 5 points). For example, when the target value of the flow rate is 100, the same operation is performed on the flow rate value near the target value such as 80%, 90%, 110%, 120%, and the like. For this reason, the flow volume setting process (step S31) mentioned above, the coating liquid discharge process (step S32), the flow volume value acquisition process (step S33) of a reference flowmeter, and the flow volume value acquisition process (step S34) of a branch pipe flowmeter are repeated in multiple times. do.

In this case, the relationship between the flow rate value indicated by the reference flowmeter 42 and the flow rate value indicated by the branch pipe flowmeter 45 may be obtained at more points than 3 to 5 points. In this case, what is necessary is just to select suitably by the required flow ranges, such as 50%-200% as well as the range of 80%-120% as mentioned above.

When the required flow rate value is acquired (step S35), a first relational expression is displayed to display the relationship between the flow rate value indicated by the reference flow meter 42 and the flow rate value indicated by the branch pipe flow meter 45 of the branch pipe to which the coating liquid is supplied. (Step S36).

FIG. 11: is a graph which shows the relationship of the flow volume value F which the reference flowmeter 42 shows and the flow volume value f which the branch pipe flowmeter 45 shows.

In the graph shown in FIG. 11, the relationship between the flow volume value F which the reference flowmeter 42 shows and the flow volume value f which the branch pipe flowmeter 45 shows is plotted three points, and the approximation curve which passes these three points is plotted. (Linear in this embodiment) is calculated | required as a 1st relational formula which shows the relationship between the flow volume value which the reference flowmeter 42 shows, and the flow volume value which the branch pipe flowmeter 45 of the branch pipe to which the coating liquid was supplied. This first relational expression is derived using, for example, the least squares method. This 1st relational expression is represented by following formula (1), when A and B are coefficients.

F = A * f + B... (One)

In addition, this 1st relational expression is not limited to the 1st formula as mentioned above. The relationship between the flow rate value indicated by the reference flow meter 42 and the flow rate value indicated by the branch pipe flow meter 45 of the branch pipe to which the coating liquid is supplied may be approximated by a curve. Moreover, you may perform several linear approximation by increasing a measuring point.

12 is a flowchart showing a second relational expression creation process. The second relational expression creating step is performed by the step shown in this FIG. 12.

That is, initially, the flow volume of a coating liquid is set (step S41). In this case, by the control of the control part 60, the flow control valve 44 of the branch pipe | tube is adjusted so that the flow volume value shown by the branch pipe flowmeter 45 of the selected branch pipe may become a preset target value. And the open / close valve 46 of the selected branch pipe is opened by the command of the control part 60. As shown in FIG. At this time, the opening / closing valve 46 of the branch pipes other than the selected branch pipe is closed.

In this state, the nozzle (from the coating liquid storage part 41 through the reference flow meter 42, the manifold 43, the flow control valve 44 of the selected branch pipe, the branch pipe flow meter 45, and the opening / closing valve 46). The coating liquid is transferred to 23, and the coating liquid is discharged from the nozzle 23 (step S42). The flow rate set value of the flow control valve 44 at this time is acquired (step S43), and the flow rate value indicated by the branch pipe flowmeter 45 at this time is obtained (step S44). The flow rate set values of these acquired flow rate control valves 44 and the flow rate values indicated by the branch pipe flow meter 45 are transmitted to the control unit 60.

And the flow volume of a coating liquid is set again until the required process is complete | finished (step S45) (step S41). That is, under the control of the control unit 60, the flow rate of the branch pipe is such that the flow rate value indicated by the branch pipe flow meter 45 of the selected branch pipe becomes a flow rate value different from the flow rate value in the previous coating liquid discharge step (step S42). The control valve 44 is adjusted. Then, the coating liquid discharge step (step S42), the flow rate setting value acquisition step (step S43), and the actual flow rate value acquisition step (step S44) are repeatedly executed.

That is, the relationship between the flow rate set value of the flow control valve 44 and the flow rate value which the branch pipe flowmeter 45 shows at this time is close to the flow rate value of the coating liquid at the time of actually discharging a coating liquid to the glass substrate 100. It is calculated | required by a plurality of points (for example, 3-5 points). For example, when the target value of the flow rate is 100, the same operation is performed on the flow rate value near the target value such as 80%, 90%, 110%, 120%, and the like. For this reason, the flow volume setting process (step S41) mentioned above, the coating liquid discharge process (step S42), the flow volume set value acquisition process (step S43), and the flow volume value acquisition process (step S44) of the branch pipe flowmeter 45 are repeated in multiple times. do.

Also in this case, the relationship between the flow rate set value of the flow control valve 44 and the flow rate value shown by the branch pipe flowmeter 45 at this time may be calculated | required more than 3-5 points. Also in this case, what is necessary is just to select suitably by the required flow ranges, such as 50%-200% as well as the range of 80%-120% as mentioned above.

When the required flow rate set value of the flow rate control valve 44 and the flow rate value indicated by the branch pipe flow meter 45 are acquired (step S45), the flow rate set value of the flow rate control valve 44 of the branch pipe to which the coating liquid is supplied and the branch pipe The 2nd relational expression which displays the relationship of the flow volume value which the installed branch pipe flowmeter 45 shows is created (step S46).

FIG. 13 is a graph showing the relationship between the flow rate set value x of the flow rate control valve 44 and the flow rate value f indicated by the branch pipe flow meter 45.

In the graph shown in FIG. 13, the relationship between the flow rate set value x of the flow control valve 44 and the flow rate value f which the branch pipe flowmeter 45 shows is plotted three points, and the approximation curve which passes these three points is plotted. (Linear in this embodiment) is the flow rate value f indicated by the flow rate set value x of the flow control valve 44 of the branch pipe to which the coating liquid is supplied, and the branch pipe flowmeter 45 of the branch pipe to which the coating liquid is supplied. It is calculated | required as a 2nd relational expression which shows the relationship between. This second relational equation is also derived using, for example, the least squares method. This second relational expression is represented by the following equation (2) when C and D are coefficients.

x = Cf + D... (2)

This second relational expression is also not limited to the first-order expression as described above. The relationship between the flow rate set value of the branch pipe to which the coating liquid is supplied and the flow rate value indicated by the branch pipe flowmeter of the branch pipe to which the coating liquid is supplied may be approximated by a curve. Moreover, you may perform several linear approximation by increasing a measuring point.

In addition, in embodiment mentioned above, in a 2nd relational expression creation process (step S2), in the 2nd relational expression creation process (step S2), the flow volume setting process (step S31) and the coating liquid discharge process ( The same flow rate setting step (step S41) and coating liquid discharge step (step S42) as in step S32 are performed. However, you may complete these processes at once. That is, after performing the flow volume setting process (step S31) and coating liquid discharge process (step S32) in a 1st relation formula preparation process (step S3), the flow volume value acquisition process (step S33) of the reference flowmeter 42, The flow rate value acquisition process (step S34) of the branch pipe flowmeter 45 and the flow rate set value acquisition process (step S43) of the flow rate control valve 44 may be performed in parallel.

Again, with reference to FIG. 7, when the first relational expression and the second relational expression are obtained by the above steps, another branch is selected next (step S2), and the first relational expression creation step (step S3) and the second relational expression creation step The branch changing process which performs (step S4) is performed (step S5).

When the first relational expression and the second relational expression are obtained for all branch pipes by the above steps (step S5), the adjustment process of the flow rate control valve 44 is executed (step S6). In this case, following formula (3) is obtained by substituting f of formula (1) mentioned above into formula (2).

x = (C / A) * (F-B) + D... (3)

After adjusting the flow control valve 44 based on this Formula (3), application | coating of the coating liquid to the glass substrate 100 is performed (step S7). At this time, the calibration of the reference flowmeter 42 is completed in the previous reference flowmeter calibration step (step S1), and the flow rate set value of the flow control valve 44 in the second relational expression creation process (step S4). Since the relationship of the flow rate value which the branch pipe flowmeter 45 shows is correct | amended, it becomes possible to discharge a coating liquid at an accurate flow volume and to perform a coating operation.

In addition, the above-mentioned calibration process (step S1) of the reference flowmeter 42 and the 1st, 2nd relational expression preparation process (step S2-step S5) for each branch pipe | tube need to be performed every time the application | coating operation of a coating liquid is performed. There is no. These steps may be performed only when necessary, for example, when the liquid type of the coating liquid is changed or when the coating operation is performed for a predetermined period.

In addition, in embodiment mentioned above, when performing the 1st, 2nd relational expression preparation process (step S2-step S5) for each branch pipe | tube, each coating tube is made to apply a coating liquid through the flow control valve 40 or the reference flowmeter 42. Although it supplies to the, in the application | coating process of a coating liquid, you may provide the exclusive bypass line for supplying a coating liquid to each branch pipe.

10 substrate holding part 11 substrate moving mechanism
12: rail 13: expect
14: rotating table 15: imaging unit
16: test coating stage 17: infusion section
18: Infusion part 19: Nozzle pitch adjustment mechanism
20: application head 21: head moving mechanism
22: guide portion 23: nozzle
24: coating liquid supply portion 25: air supply source
31: slider 32: through hole
33: Pulley 34: Synchronous Belt
40: flow rate control valve 41: coating liquid storage part
42: reference flow meter 43: manifold
44 flow control valve 45 branch pipe flow meter
46: on-off valve 51: on-off valve
52: correction unit 53: container
54 electronic balance 55 chamber
56: lid 57: metal customs
60: control unit 100: glass substrate

Claims (6)

A coating liquid storage part for storing the coating liquid, a plurality of nozzles for discharging the coating liquid, and a coating liquid supplied from the coating liquid storage part through the main pipe are classified into a plurality of branch pipes connected to the nozzle ( A branch flow meter installed in the main pipe, a reference flow meter for measuring the flow rate of the coating liquid flowing through the main pipe, and a plurality of branch pipes respectively installed in the branch pipes and measuring flow rates of the coating liquid flowing through the respective pipes. On the basis of a flow meter, a plurality of flow control valves respectively provided in the branch pipes for adjusting the flow rate of the coating liquid flowing through the branch pipes, and the flow values measured by the branch pipe flow meters, the operation of the respective flow control valves is performed. As a coating liquid application method in the coating device which has a control part to control and apply | coats a coating liquid to a board | substrate,
The flow rate value indicated by the reference flow meter provided in the main pipe when the coating liquid stored in the coating liquid storage unit was supplied to only one branch pipe of the plurality of branch pipes through the main pipe, and the paper pipe to which the coating liquid was supplied. A first relational expression making step of obtaining a first relational expression indicating a relationship between flow values indicated by a branch pipe flow meter;
When the coating liquid stored in the coating liquid storage part is supplied only to one branch pipe among the plurality of branch pipes through the main pipe, the flow rate set value of the flow control valve provided in the branch pipe to which the coating liquid is supplied, and the branch pipe. A second relational expression making step of obtaining a second relational expression displaying a relationship between flow rates indicated by the installed branch pipe flow meter;
A branch pipe changing step of sequentially executing the first relational expression creating step and the second relational expression creating step with respect to another branch of a plurality of branches;
And a coating step of supplying a coating liquid to the substrate by controlling a flow control valve of the respective branch pipes based on the first relational expression and the second relational expression created for the respective branch pipes. The method according to claim 1,
In the first relational expression making step,
Coating liquid coating which repeats the operation | movement which supplies the coating liquid stored in the said coating liquid storage part only to one branch pipe of the said plurality of branch pipes through the said main pipe, and repeats several times by changing the opening degree of the said flow control valve. Way. The method according to claim 2,
In the second relational expression making step,
The coating liquid application method of repeating an operation of supplying the coating liquid stored in the said coating liquid storage part only to the one branch pipe of the said plurality of branch pipes through the said main pipe in multiple times by changing the opening degree of the said flow control valve. The method according to any one of claims 1 to 3,
Coating liquid coating provided with the calibration process which corrects the said reference flowmeter based on the weight of the coating liquid which passed the said main building, and the flow volume value measured by the said reference flowmeter at that time before the said 2nd relation preparation process. Way. A coating device for applying a coating liquid to a substrate,
A coating liquid storage portion for storing the coating liquid,
A plurality of nozzles for discharging the coating liquid;
A branching part which classifies the coating liquid supplied from the said coating liquid storage part through the main pipe into the some branch pipe connected to the said nozzle,
A reference flow meter provided in the main building and measuring a flow rate of the coating liquid flowing through the main building;
A plurality of branch pipe flowmeters respectively provided in the branch pipes and measuring flow rates of the coating liquid flowing through the branch pipes;
A plurality of flow rate control valves provided in the branch pipes to adjust flow rates of the coating liquid flowing through the branch pipes,
The control part which controls the operation | movement of each said flow control valve based on the flow volume value which each branch pipe flowmeter measured,
The control unit includes a flow rate value indicated by the reference flow meter measured when the coating liquid supplied to the main pipe is supplied only to a single branch pipe selected from the plurality of branch pipes, and supply of the coating liquid to another branch pipe is abolished, and the coating The first relational expression for displaying the relationship between the flow rate value indicated by the branch pipe flow meter provided in the branch pipe to which the liquid is supplied, the flow rate set value of the flow control valve installed in the branch pipe to which the coating liquid is supplied, and the flow rate indicated by the branch pipe flow meter installed in the branch pipe. An application device for controlling the flow control valve on the basis of a second relational expression indicating a relationship between teeth. The method according to claim 5,
A branch for calibration branching off from the branch;
An on / off valve installed on the calibration branch pipe,
A container receiving the coating liquid discharged from the calibration branch pipe while the coating liquid supplied to the main pipe is supplied only to the calibration branch pipe and the supply of the coating liquid to the other branch pipe is abolished;
An electronic balance for measuring the weight of the container and the coating liquid stored therein;
And a reference flow rate calibration mechanism for calibrating the reference flow meter.

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