WO2020045469A1 - 塗布装置 - Google Patents
塗布装置 Download PDFInfo
- Publication number
- WO2020045469A1 WO2020045469A1 PCT/JP2019/033632 JP2019033632W WO2020045469A1 WO 2020045469 A1 WO2020045469 A1 WO 2020045469A1 JP 2019033632 W JP2019033632 W JP 2019033632W WO 2020045469 A1 WO2020045469 A1 WO 2020045469A1
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- WIPO (PCT)
- Prior art keywords
- coating liquid
- coating
- nozzle
- chamber
- discharge
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
Definitions
- the present invention relates to a coating device.
- an application device is used when applying an application liquid on an object.
- the coating liquid chamber is filled with the coating liquid, and pressure is applied to the coating liquid in the coating liquid chamber by using, for example, a piezoelectric element (piezo element), so that the coating liquid is discharged from the discharge port continuous to the coating liquid chamber.
- a droplet of the application liquid is discharged.
- a coating liquid tank is connected to the coating liquid chamber, and the coating liquid is supplied from the coating liquid tank into the coating liquid chamber in parallel with the discharging operation of the coating head.
- JP-A-2000-308843 in Japanese Patent Application Laid-Open Publication No. 2000-308843, in a dispenser that applies air pressure to a material in a container and drops the material from a needle, a cutout portion and a protrusion are provided at a discharge port of the needle. A technique for shortening the time required for dropping a material is disclosed. Japanese Unexamined Patent Publication: JP-A-2000-308843
- the replenishment flow rate of the coating liquid from the coating liquid tank to the coating liquid chamber has a certain limit depending on the viscosity of the coating liquid and the like.
- the coating liquid runs out in the nozzle chamber reaching the outlet. In this case, air enters the coating liquid chamber, and the coating liquid cannot be stably discharged.
- the present invention has been made in view of the above problems, and has as its object to apply a coating liquid at a high speed while suppressing intrusion of air into a coating liquid chamber.
- An exemplary coating apparatus of the present invention includes: a coating head that discharges droplets of a coating liquid from a discharge port; a coating liquid supply unit that supplies the coating liquid to the coating head; A control unit for controlling discharge.
- the coating head is a coating liquid chamber filled with the coating liquid, a flow path continuous from the coating liquid chamber, a nozzle chamber having a discharge opening at a leading end opening, and discharging the droplet from the discharge port.
- a discharge mechanism for performing the discharge The controller controls the replenishment flow rate and the nozzle chamber as a replenishment flow rate, wherein a volume per unit time of the coating liquid replenishable from the coating liquid supply unit into the coating liquid chamber in parallel with a discharge operation in the coating head is a replenishment flow rate.
- a discharge parameter determining unit that determines discharge parameters in a continuous discharge period in which the liquid droplets are continuously discharged from the application head based on the volume of the discharge head.
- the continuous discharge period includes an increased discharge period in which the volume per unit time of the application liquid discharged from the discharge port is larger than the replenishment flow rate, and the discharge is performed from the discharge port in the continuous discharge period.
- the total volume of the coating liquid is equal to or less than the sum of the volume of the nozzle chamber and the total volume of the coating liquid supplied into the coating liquid chamber from the coating liquid supply unit during the continuous discharge period.
- a coating liquid can be apply
- FIG. 1 is a diagram illustrating the configuration of the coating apparatus.
- FIG. 2 is a sectional view showing the coating head.
- FIG. 3 is a diagram showing a flow of a coating operation in the coating apparatus.
- FIG. 4 is a diagram illustrating the coating head before the nozzle unit is replaced.
- FIG. 5 is a diagram showing the application head during the continuous ejection period.
- FIG. 6 is a diagram showing a coating head provided with another nozzle unit.
- FIG. 7 is a diagram illustrating a coating head provided with another nozzle unit.
- FIG. 1 is a diagram illustrating a configuration of a coating apparatus 1 according to an exemplary embodiment of the present invention.
- the coating device 1 is a device for coating a predetermined coating liquid on an object 9 which is various substrates such as a printed board and a semiconductor substrate.
- the object 9 may be a mechanical part or the like.
- the coating liquid is, for example, various adhesives (epoxy, UV curing, etc.), solder paste, sealing agent, underfill agent, grease, and the like.
- the coating apparatus 1 includes a control unit 10, a moving mechanism 2, a coating head 3, a coating liquid supply unit 4, and a nozzle identification camera 5.
- the nozzle identification camera 5 images a predetermined position of the coating head 3.
- the control unit 10 is a computer including a processor such as a CPU, for example, and performs overall control of the coating apparatus 1. Further, the control unit 10 includes an ejection parameter determination unit 101 and a storage unit 102.
- the ejection parameter determination unit 101 is realized by a computer executing a predetermined program.
- the ejection parameter determination unit 101 may be constructed by a dedicated electric circuit, or a dedicated electric circuit may be partially used.
- the storage unit 102 is realized by a memory or the like provided in the control unit 10 and stores the nozzle chamber information A and the supply flow rate information B. Details of the nozzle identification camera 5, the ejection parameter determination unit 101, the nozzle chamber information A and the supply flow rate information B will be described later.
- the moving mechanism 2 includes a stage 21 and a stage moving mechanism 22.
- the stage 21 holds the object 9.
- the stage moving mechanism 22 moves the stage 21 with respect to the coating head 3.
- the moving direction of the stage 21 by the stage moving mechanism 22 is, for example, two directions perpendicular to each other. Typically, these moving directions are perpendicular to the direction in which the coating head 3 discharges the droplets of the coating liquid.
- the stage moving mechanism 22 may be capable of rotating the stage 21 about an axis parallel to the ejection direction.
- the coating liquid supply unit 4 supplies a coating liquid to a coating liquid chamber 36 described later in the coating head 3.
- the coating liquid supply unit 4 includes a coating liquid tank 41, a supply pipe 42, and a pressure adjusting unit 43.
- the coating liquid tank 41 stores the coating liquid.
- the inside of the coating liquid tank 41 is sealed.
- One end of the supply pipe 42 is connected to the coating liquid tank 41, and the other end is connected to the coating head 3. That is, the inside of the coating liquid tank 41 and the coating liquid chamber 36 of the coating head 3 are spatially continuous via the supply pipe 42.
- the coating liquid tank 41 is disposed vertically above the coating head 3.
- the pressure adjusting unit 43 includes, for example, a pressure adjusting pump.
- the pressure in the application liquid tank 41 is adjusted by the pressure adjustment unit 43 to an arbitrary value within a pressure range including the atmospheric pressure.
- the pressure in the coating liquid tank 41 is adjusted to a negative pressure lower than the atmospheric pressure.
- the position of the application liquid tank 41 is not limited to a position above the application head 3, and the application liquid tank 41 can be arranged at a desired position.
- FIG. 2 is a sectional view showing the coating head 3.
- FIG. 2 shows a cross section of the coating head 3 on a plane including a center line C1 of a discharge port 381 described later.
- the coating head 3 includes a main body 31 and a nozzle 35.
- the main body part 31 includes a main body annular part 32, a liquid contact film 33, and a pressurizing part 34.
- the main body annular portion 32 is an annular member formed of, for example, a metal or the like and centered on the center line C1.
- the liquid contact film 33 and the pressurizing section 34 will be described later.
- the nozzle portion 35 is an annular member with a bottom centered on the center line C1 formed of, for example, metal.
- a nozzle portion 35 is attached to one surface perpendicular to the center line C1.
- the nozzle portion 35 is fixed to the main body annular portion 32 by a plurality of bolts 39.
- a plurality of types of nozzle portions 35 are prepared, and the nozzle portions 35 can be replaced by attaching and detaching bolts 39.
- a seal member (not shown) surrounding the application liquid chamber 36 is provided between the main body annular portion 32 and the nozzle portion 35, and the application liquid leaks from the space between the main body annular portion 32 and the nozzle portion 35 to the outside. It is prevented from being issued.
- the inner diameter of the main body annular portion 32 is substantially the same as the inner diameter of the nozzle portion 35. In the direction parallel to the center line C1, the inner peripheral surface of the main body annular portion 32 is approximately continuous with the inner peripheral surface of the nozzle portion 35, and the inner peripheral surface of the main body annular portion 32 and the inner peripheral surface of the nozzle portion 35
- the side of the chamber 36 is formed.
- the coating liquid chamber 36 is an internal space of the coating head 3 and is, for example, a columnar space centered on the center line C1.
- the coating liquid chamber 36 is filled with a coating liquid. As will be described later, a pressure is applied to the coating liquid in the coating liquid chamber 36 by the pressurizing unit 34, and thus the coating liquid chamber 36 is also called a pressure chamber.
- One end of a supply channel 37 is provided on a side surface of the coating liquid chamber 36. The other end of the supply channel 37 is provided, for example, on a surface of the main body annular portion 32 facing the side opposite to the nozzle portion 35.
- a nozzle chamber 38 is provided on the bottom surface of the coating liquid chamber 36.
- the nozzle chamber 38 is a fine flow path that is continuous from the application liquid chamber 36.
- the nozzle chamber 38 communicates with the bottom of the coating liquid chamber 36 formed in the nozzle section 35.
- the nozzle chamber 38 is a substantially columnar space centered on the center line C1.
- the opening on the opposite side of the coating liquid chamber 36 in the nozzle chamber 38, that is, the opening at the tip of the nozzle chamber 38 becomes the discharge port 381.
- the diameter of the flow path gradually decreases from the application liquid chamber 36 toward the discharge port 381.
- the nozzle chamber 38 is a tapered flow path. In the example of FIG.
- the rate at which the diameter of the nozzle chamber 38 decreases that is, the inclination angle of the side surface of the nozzle chamber 38 is constant.
- the diameter of the nozzle chamber 38 is sufficiently smaller than the diameter of the coating liquid chamber 36 at any position.
- the average diameter of the nozzle chamber 38 that is, the average diameter is, for example, included in a range of 0.05 mm to 0.5 mm.
- the average diameter is, for example, the average of the diameter of the opening on the side of the coating liquid chamber 36 and the diameter of the above-mentioned tip opening.
- the maximum value of the cross-sectional area of the nozzle chamber 38 perpendicular to the center line C1 is 1/5 or less, preferably 1/10 or less of the cross-sectional area of the coating liquid chamber 36.
- Identification information for identifying the nozzle unit 35 is formed at a predetermined position on the outer surface of the nozzle unit 35 (hereinafter, referred to as “display position”).
- the identification information is an uneven pattern.
- the identification information may be characters, figures, symbols, and the like printed at the display position, in addition to the concave / convex pattern.
- a plurality of types of nozzle sections 35 having different volumes, shapes, and the like of the nozzle chambers 38 are prepared in advance. In the plurality of types of nozzle sections 35, different identification information is formed at display positions.
- the liquid contact film 33 of the main body 31 is a diaphragm formed of metal or the like.
- the liquid contact film 33 faces the discharge port 381.
- the liquid contact film 33 forms a surface of the coating liquid chamber 36 that faces the bottom surface.
- a coating liquid chamber 36 is formed by the main body annular portion 32, the liquid contact film 33, and the nozzle portion 35.
- the surface of the liquid contact film 33 on the side of the coating liquid chamber 36 is a liquid contact surface that comes into contact with the coating liquid in the coating liquid chamber 36.
- the outer edge of the liquid contacting film 33 is fixed to the main body annular portion 32. Except for the nozzle chamber 38 and the supply channel 37, the coating liquid chamber 36 is sealed by the main body 31 and the nozzle 35.
- a discharge port or the like for removing bubbles contained in the coating liquid in the coating liquid chamber 36 may be provided as necessary.
- the pressing unit 34 includes a piezoelectric element 341 and a drive circuit 342 (see FIG. 1).
- the piezoelectric element 341 presses a surface of the liquid contacting film 33 different from the liquid contacting surface.
- the piezoelectric element 341 directly presses the liquid contact film 33 has been described here, the invention is not limited thereto, and the piezoelectric element 341 may press the liquid contact film 33 through another member.
- the surface of the piezoelectric element 341 opposite to the liquid contact film 33 is fixed to a support member (not shown).
- the drive circuit 342 is electrically connected to the piezoelectric element 341.
- the piezoelectric element 341 expands and contracts, and the amount of bending of the liquid contact film 33 changes.
- the liquid contact film 33 bends toward the discharge port 381
- pressure is applied to the coating liquid in the coating liquid chamber 36, and a droplet of the coating liquid is discharged from the discharge port 381 to the outside.
- the pressurizing unit 34 is a discharge mechanism that discharges liquid droplets from the discharge ports 381 by pressing the coating liquid in the coating liquid chamber 36.
- the direction in which the pressing unit 34 bends the liquid contact film 33 includes a direction orthogonal to the liquid contact film 33 that is not bent.
- the drive signal is a signal for instructing ejection of one droplet.
- the waveform of the drive signal may be arbitrarily determined.
- the number of drive signals input to the piezoelectric element 341 per unit time is referred to as the ejection frequency.
- FIG. 3 is a diagram showing a flow of a coating operation in the coating device 1.
- the replenishment flow rate of the application liquid to be applied to the target 9 is acquired by the ejection parameter determination unit 101 in FIG. 1 (Step S10).
- the application liquid to be applied to the object 9 is an application liquid stored in or scheduled to be stored in the application liquid tank 41.
- the coating liquid is supplied from the coating liquid tank 41 to the coating liquid chamber 36 of the coating head 3 in FIG. 2, that is, in the coating liquid tank 41, the supply pipe 42, the supply channel 37, and the coating liquid chamber 36.
- the coating liquid is filled almost entirely in the nozzle chamber 38 by a capillary phenomenon.
- a liquid surface M (meniscus) of the coating liquid is formed at the discharge port 381.
- the pressurizing unit 34 pressurizes the coating liquid in the coating liquid chamber 36 and discharges droplets from the discharge port 381, the liquid surface M does not exist at the discharge port 381, and therefore, in the following description, When the liquid level M of the coating liquid is referred to, it is assumed that the coating liquid in the coating liquid chamber 36 is not pressurized.
- the pressure adjustment unit 43 controls the pressure of the application liquid in the vicinity of the nozzle chamber 38 so as to be substantially the same as or slightly lower than the atmospheric pressure around the discharge port 381. The pressure has been adjusted.
- the application liquid in the nozzle chamber 38 decreases due to the droplet discharge operation, the application liquid in the application liquid chamber 36 is drawn into the nozzle chamber 38 by capillary action.
- the coating liquid is also supplied from the coating liquid supply unit 4 into the coating liquid chamber 36, that is, the coating liquid is supplied into the coating liquid chamber 36.
- the volume per unit time of the coating liquid replenished from the coating liquid supply unit 4 into the coating liquid chamber 36 while continuously discharging droplets at the highest discharge frequency described later ( Flow rate) is lower than the volume of the application liquid discharged from the discharge port 381 per unit time.
- the volume per unit time of the coating liquid supplied from the coating liquid supply unit 4 into the coating liquid chamber 36 is the supply flow rate.
- the replenishment flow rate is the volume per unit time of the coating liquid that can be replenished from the coating liquid supply unit 4 into the coating liquid chamber 36 in parallel with the operation of discharging the liquid droplets in the coating head 3, typically, the maximum. Volume.
- the supply flow rate largely depends on the viscosity of the coating liquid stored in the coating liquid tank 41.
- information indicating the supply flow rates of a plurality of types of application liquids is stored in the storage unit 102 as supply flow rate information B.
- the replenishment flow rates of the plurality of types of coating liquids are obtained by, for example, experiments or simulations.
- the input of the type of the application liquid to be applied to the object 9 is performed by the operator via an input unit (not shown) provided in the control unit 10.
- the discharge parameter determining unit 101 receives the input indicating the type of the application liquid, and acquires the supply flow rate of the application liquid based on the input and the supply flow rate information B.
- the replenishment flow rate of the application liquid is stored in the ejection parameter determination unit 101.
- the nozzle unit 35 of the application head 3 is replaced with the application liquid to be applied to the object 9 (Step S11).
- the nozzle unit 35 in FIG. 4 has been replaced with the nozzle unit 35 in FIG.
- the average diameter and the volume of the nozzle chamber 38 are larger than those in the nozzle portion 35 before replacement in FIG.
- the side wall of the nozzle chamber 38 has the same inclination angle.
- the nozzle section 35 having a large average diameter of the nozzle chamber 38 is selected.
- by exchanging the nozzle unit 35 it becomes possible to appropriately apply the coating liquid to be actually used on the target object 9.
- the replacement of the nozzle unit 35 is performed by an operator at the installation location of the coating apparatus 1, for example.
- the replacement of the nozzle unit 35 may be performed in a manufacturing factory or the like of the coating apparatus 1 as an adjustment operation of the coating apparatus 1.
- a valve (not shown) in the supply pipe 42 is closed. By opening the valve after replacing the nozzle unit 35, the coating liquid chamber 36 of the coating head 3 is filled with the coating liquid.
- the identification information formed at the display position of the nozzle unit 35 is imaged.
- the image of the identification information is input to the control unit 10.
- the control unit 10 specifies the type of the nozzle unit 35 provided in the coating head 3 based on the image of the identification information.
- the nozzle identification camera 5 and the control unit 10 implement a nozzle identification unit that identifies the type of the nozzle unit 35 in the application head 3.
- the result of identification by the nozzle identification unit is received by the ejection parameter determination unit 101 as an input of the type of the nozzle unit 35 provided in the coating head 3.
- the nozzle chamber information A stored in the storage unit 102 indicates the volumes of the nozzle chambers 38 in the plurality of types of nozzle units 35.
- the nozzle chamber information A can be easily prepared by calculating the volume of the nozzle chamber 38 using the design data of each nozzle section 35 or by actually measuring the volume of the nozzle chamber 38.
- the ejection parameter determination unit 101 acquires the volume of the nozzle chamber 38 of the nozzle unit 35 provided in the coating head 3 based on the input indicating the type of the nozzle unit 35 and the nozzle chamber information A (step S12).
- Step S13 a value obtained by converting the volume of the nozzle chamber 38 into the number of droplets of the coating liquid discharged from the discharge port 381 is obtained as the number of droplets of the nozzle chamber ( Step S13).
- the voltage of the drive signal input to the piezoelectric element 341 is constant at the set voltage.
- the volume of the droplets discharged from the discharge port 381 by inputting the drive signal of the set voltage Is stored in advance is created by, for example, simulation or experiment.
- the ejection parameter determination unit 101 determines the volume of the droplet ejected from the application head 3 by referring to the table using the above-described input of the type of the application liquid and the input of the type of the nozzle unit 35. Specified as volume. Then, the number of droplets in the nozzle chamber is obtained by dividing the volume of the nozzle chamber 38 by the specific volume.
- the number of droplets in the nozzle chamber is 30 from 300 [nL] ⁇ 10 [nL].
- the nozzle chamber 38 is filled with the application liquid, and the number of droplets in the nozzle chamber is the number of droplets of a specific volume that can be ejected only by the application liquid filled in the nozzle chamber 38. .
- the number of droplets in the nozzle chamber is stored in the ejection parameter determination unit 101.
- the volume (specific volume) of the droplet discharged from the discharge port 381 is, for example, 2 nL or more and 50 nL or less.
- the value obtained by multiplying the number of droplets in the nozzle chamber by the specific volume may be equal to or less than the volume of the nozzle chamber 38, and the difference between the above value and the volume of the nozzle chamber 38 is determined. It may be larger than the volume.
- steps S10 to S13 are preparations for the coating operation and are performed as necessary.
- the processing in step S10 is performed when the type of the coating liquid actually used is changed by replacing the coating liquid in the coating liquid tank 41 or by replacing the coating liquid tank 41. Is obtained.
- the process in step S12 is performed when the nozzle unit 35 is replaced in step S11, and the volume of the nozzle chamber 38 in the nozzle unit 35 after replacement is obtained.
- the process of step S13 is performed when the process of step S10 or the process of step S12 is performed, that is, when the replenishment flow rate of the application liquid or the volume of the nozzle chamber 38 is changed, and the number of droplets in the nozzle chamber is changed. Is updated.
- the ejection parameter determination unit 101 receives an application command for the attention position (step S14).
- the application instruction is information indicating the volume of the application liquid to be applied to each position on the object 9 as an application amount. Subsequently, the ejection parameter determination unit 101 determines the ejection parameters related to the ejection of the droplet to the target position based on the application command.
- the volume (specific volume) of the droplets discharged from the application head 3 is sufficiently smaller than the application amount to be applied to each position on the object 9, Droplets are continuously discharged. Therefore, the ejection parameter determination unit 101 determines an ejection parameter in a continuous ejection period in which a droplet is continuously ejected to a target position.
- the continuous discharge period is divided into an increased discharge period and a fixed discharge period, and the discharge parameters are the length of the increased discharge period and the fixed discharge period in the continuous discharge period, and the increased discharge period and the fixed discharge period. It includes the ejection frequency and the voltage of the drive signal in each of the periods.
- the ejection frequency is the frequency of the drive signal, and indicates the number of droplets ejected from the ejection port 381 per unit time.
- the voltage of the drive signal in the ejection parameters is constant at the set voltage, in the ejection of droplets described below, the droplets of the above-described specific volume are ejected from the ejection port 381.
- a value obtained by converting the amount of application to be applied to the target position into the number of droplets of the application liquid ejected from the ejection port 381 is obtained as the required number of droplets (step S15).
- the required number of droplets is determined by dividing the application amount by a specific volume. For example, when the application amount of the application liquid to be applied to the target position is 500 nL and the specific volume of the droplet is 10 nL, the required number of droplets is 50.
- the ejection parameter determination unit 101 compares the required number of droplets at the target position with the number of droplets in the nozzle chamber. If the required number of droplets is larger than the number of droplets in the nozzle chamber (step S16), it is instructed to discharge the number of droplets in the number of nozzle chambers at the highest discharge frequency at the beginning of the continuous discharge period for the target position. Discharge parameters are determined.
- the maximum ejection frequency is set in advance due to the specifications of the piezoelectric element 341 and the limitation of the drive circuit 342. A period in which the droplets of the number of the nozzle chambers are ejected at the highest ejection frequency is referred to as an “increased ejection period”. Length.
- the determination of the above-described ejection parameters with respect to the beginning of the continuous ejection period is the determination of the length of the increased ejection period and the ejection frequency (maximum ejection frequency) in the increased ejection period.
- the meaning of the increased discharge period will be described later.
- the discharge parameter determination unit 101 discharges the remaining number of droplets obtained by subtracting the number of nozzle chamber droplets from the required number of droplets in the remaining period of the continuous discharge period, and discharges the droplets corresponding to the supply flow rate of the application liquid.
- An ejection parameter for instructing ejection at a frequency (hereinafter, referred to as “equilibrium ejection frequency”) is determined.
- the supply flow rate is a volume per unit time of the coating liquid that can be supplied from the coating liquid supply unit 4 into the coating liquid chamber 36.
- the equilibrium ejection frequency is a number obtained by dividing the replenishment flow rate by the specific volume of the droplet, and is sufficiently lower than the maximum ejection frequency.
- a value obtained by multiplying the number of remaining droplets by the reciprocal of the equilibrium ejection frequency is: This is the length of the fixed-quantity ejection period. Therefore, it can be said that the determination of the ejection parameters for the remaining period of the continuous ejection period is the determination of the length of the constant-rate ejection period and the ejection frequency in the constant-rate ejection period.
- the discharge parameters in the continuous discharge period including the increased discharge period and the fixed discharge period are determined (step S17).
- the length of the increased ejection period is 30 milliseconds.
- the required number of droplets is 50
- the number of remaining droplets obtained by subtracting the number of droplets in the nozzle chamber from the required number of droplets is 20.
- the replenishment flow rate is 10 nL / sec and the specific volume of the droplet is 10 nL
- the equilibrium ejection frequency is 1 Hz
- the length of the fixed-quantity ejection period is 20 seconds.
- the length of the continuous discharge period in which the required number of droplets are continuously discharged is the total length of the increased discharge period and the fixed discharge period, and is 20.03 seconds.
- the moving mechanism 2 moves the stage 21 in parallel with the determination of the discharge parameters, so that the target position on the object 9 is arranged at a position facing the discharge port 381 of the coating head 3.
- the drive circuit 342 inputs a drive signal to the piezoelectric element 341 according to the above-described ejection parameters, so that the droplet is ejected to the target position (step S18).
- 30 droplets which is the number of droplets in the nozzle chamber, are ejected at the maximum ejection frequency of 1 kHz, and subsequently, 20 droplets, which are the remaining number of droplets, are ejected at the equilibrium ejection frequency of 1 Hz. Is done.
- droplets are ejected at the maximum ejection frequency of 1 kHz during the increased ejection period of 30 milliseconds, and droplets are ejected at the equilibrium ejection frequency of 1 Hz during the 20-second quantitative ejection period that follows the increased ejection period.
- the control unit 10 controls the ejection of the liquid droplets from the application head 3, and applies the application amount of the application liquid indicated by the application instruction to the target position.
- the volume of the application liquid discharged from the discharge port 381 per unit time is larger than the replenishment flow rate during the increased discharge period. That is, the discharge amount of the coating liquid per unit time in the increased discharge period is larger than the discharge amount of the coating liquid per unit time in the fixed discharge period, and is larger than that in the fixed discharge period.
- the position of the liquid surface M of the coating liquid in the nozzle chamber 38 gradually approaches the coating liquid chamber 36.
- the liquid surface M of the coating liquid is located near the opening of the nozzle chamber 38 on the side of the coating liquid chamber 36.
- the amount (volume) of the application liquid discharged during the increased discharge period is equal to or less than the amount of the coating liquid filled in the nozzle chamber 38. Therefore, the edge of the liquid surface M of the coating liquid does not enter the coating liquid chamber 36 beyond the opening of the nozzle chamber 38.
- the total volume of the coating liquid discharged from the discharge port 381 is equal to the volume of the nozzle chamber 38 and the amount of the coating liquid supplied from the coating liquid supply unit 4 into the coating liquid chamber 36 during the continuous discharge period. It is equal to or less than the sum of the total volume.
- the required number of droplets is larger than the number of droplets in the nozzle chamber, and the total volume of the application liquid ejected during the continuous ejection period is larger than the volume of the nozzle chamber 38.
- the total volume of the coating liquid discharged in the continuous discharging period is larger than the total volume of the coating liquid supplied into the coating liquid chamber 36, and as described above, the edge of the liquid surface M of the coating liquid is It moves to the coating liquid chamber 36 side.
- the continuous ejection period In step S19, the ejection parameters for instructing the ejection of the required number of droplets at the highest ejection frequency are determined.
- the length of the continuous ejection period is a value obtained by multiplying the required number of droplets by the reciprocal of the maximum ejection frequency.
- the above-described determination of the ejection parameter is a determination of the ejection parameter in the continuous ejection period including only the increased ejection period.
- the drive circuit 342 inputs a drive signal to the piezoelectric element 341 in accordance with the above-mentioned ejection parameters in a state where the attention position on the target object 9 is arranged at a position facing the ejection port 381 of the coating head 3, and The droplet is discharged to the position (step S18).
- the application liquid of the application amount indicated by the application command is applied to the target position at high speed without depending on the supply flow rate.
- the amount of the coating liquid discharged to the target position is equal to or less than the amount of the coating liquid filled in the nozzle chamber 38. Therefore, the edge of the liquid surface M of the coating liquid does not enter the coating liquid chamber 36 beyond the opening of the nozzle chamber 38 on the side of the coating liquid chamber 36.
- steps S14 to S17 and S19 relating to the determination of the ejection parameter for each application position may be performed before the ejection operation (step S18) for the application position.
- the application is performed before the application position. It may be performed in parallel with the ejection operation to the application position where the liquid is applied.
- the coating apparatus of the first comparative example always discharges the required number of droplets at the highest discharge frequency to each coating position.
- the amount of the application liquid discharged to the application position fills the nozzle chamber 38.
- the pressure applied by the pressurizing section 34 to the inside of the coating liquid chamber 36 is absorbed by the bubbles, and the coating liquid is not stably discharged from the discharge port 381.
- the coating apparatus of the second comparative example always discharges the required number of droplets at an equilibrium discharge frequency to each coating position.
- the coating apparatus of the second comparative example since the droplets are discharged at an equilibrium discharge frequency corresponding to the supply flow rate of the coating liquid, the position of the edge of the liquid surface M of the coating liquid is maintained in the nozzle chamber 38.
- the equilibrium ejection frequency is much lower than the maximum ejection frequency, it takes a long time to apply the application liquid to the application position. For example, when the equilibrium ejection frequency is 1 Hz and the required number of droplets is 50, it takes 50 seconds to apply the application liquid.
- the discharge parameter determination unit 101 performs a continuous discharge period in which droplets are continuously discharged from the coating head 3 based on the supply flow rate of the coating liquid and the volume of the nozzle chamber 38. Is determined. Accordingly, the continuous discharge period includes the increased discharge period in which the volume per unit time of the coating liquid discharged from the discharge port 381 is larger than the replenishment flow rate, and the coating liquid can be applied at a high speed.
- the total volume of the coating liquid discharged from the discharge port 381 during the continuous discharge period is determined by the total volume of the nozzle chamber 38 and the total amount of the coating liquid supplied from the coating liquid supply unit 4 into the coating liquid chamber 36 during the continuous discharge period. It is less than or equal to the sum of the volumes.
- the liquid surface M of the coating liquid in the nozzle chamber 38 during the continuous discharging period except for the time when the coating liquid in the coating liquid chamber 36 is pressurized, that is, during the period except when discharging the liquid droplets of the coating liquid. Can be maintained.
- the coating apparatus 1 it is possible to suppress the invasion of air into the coating liquid chamber 36, and to stably apply the coating liquid.
- the application speed which is the volume of the application liquid applied to the object 9 per unit time, can be improved.
- the nozzle section 35 including the nozzle chamber 38 can be replaced with another nozzle section 35.
- the volume of the nozzle chamber 38 in the other nozzle section 35 is different from the volume of the nozzle chamber 38 in the nozzle section 35 before replacement. Therefore, in the application head 3, various kinds of application liquids having different viscosities can be appropriately discharged by replacing the nozzle portion 35. For example, a coating liquid having a viscosity of 100 millipascal seconds (mPa ⁇ s) or more can be appropriately discharged.
- a coating liquid having a viscosity of 1000 mPa ⁇ s or more can be suitably discharged, and a coating liquid having a viscosity of 8000 mPa ⁇ s or more can be discharged.
- the upper limit of the viscosity of the coating liquid that can be ejected from the coating head 3 is, for example, 300,000 mPa ⁇ s, depending on the design of the nozzle unit 35.
- the ejection parameter determination unit 101 receives an application command indicating the application amount of the application liquid to be applied to each application position on the object 9. Then, based on the application command, the ejection parameters for the application position in the continuous ejection period are determined.
- the coating apparatus 1 can automatically determine a preferable ejection parameter, and can easily perform high-speed coating.
- the ejection parameters determined for one application position may be used as they are for the other application positions.
- the control section 10 stores nozzle chamber information A indicating the volume of the nozzle chamber 38 in the plurality of types of nozzle sections 35. Further, the ejection parameter determination unit 101 receives an input of the type of the nozzle unit 35 provided in the coating head 3. Thus, the volume of the nozzle chamber 38 in the coating head 3 can be easily acquired based on the input and the nozzle chamber information A.
- the type of the nozzle unit 35 provided in the coating head 3 is identified by the nozzle identification unit, and the identification result of the nozzle identification unit is received by the ejection parameter determination unit 101 as the input.
- the nozzle identification unit may identify the type of the nozzle unit 35 using a sensor other than the nozzle identification camera 5.
- the operator inputs the type of the nozzle unit 35 provided on the coating head 3 via the input unit of the control unit 10, and the input is performed by the ejection parameter determination unit 101. May be accepted.
- the control unit 10 stores replenishment flow rate information B indicating replenishment flow rates of a plurality of types of application liquids.
- the ejection parameter determining unit 101 receives an input of the type of the coating liquid supplied from the coating liquid supply unit 4 to the coating head 3.
- the supply flow rate of the application liquid can be easily acquired based on the input and the supply flow rate information B.
- the replenishment flow rate of the application liquid may be input by the operator via the input unit of the control unit 10.
- the setting method of the discharge parameter in the continuous discharge period is such that the total volume of the coating liquid discharged from the discharge port 381 in the continuous discharge period is the same as the volume of the nozzle chamber 38 and the coating liquid supplied to the coating liquid chamber 36 in the continuous discharge period. It may be appropriately changed within a range not more than the sum of the total volume of the liquid. For example, the entire continuous discharge period may be set as the increased discharge period, and a discharge frequency lower than the maximum discharge frequency and higher than the equilibrium discharge frequency may be set. In this case, the volume per unit time of the applied coating liquid per unit time is made larger than the replenishment flow rate by the amount that the volume of the coating liquid corresponding to the volume of the nozzle chamber 38 is evenly distributed in the continuous discharge period.
- the ejection frequency during the increased ejection period may fluctuate.
- control relating to high-speed coating can be simplified.
- the volume per unit time of the application liquid to be discharged may be a fixed amount less than the supply flow rate.
- the difference between the volume per unit time of the application liquid to be discharged and the replenishment flow rate during the fixed discharge period Is supplied into the nozzle chamber 38 per unit time.
- the volume of the application liquid discharged from the discharge port 381 per unit time may be a fixed amount equal to or less than the supply flow rate.
- the volume of the droplet may be made larger than the specific volume by making the ejection frequency constant during the increased ejection period and the fixed-quantity ejection period and making the drive signal voltage higher than the fixed-quantity ejection period during the increased ejection period.
- the volume per unit time of the application liquid discharged from the discharge port 381 during the increased discharge period can be larger than the supply flow rate.
- the target object 9 may be moved during the continuous ejection period.
- the plurality of types of nozzle sections 35 prepared in the coating apparatus 1 may include those having different lengths and shapes of the nozzle chambers 38 in addition to the average diameter of the nozzle chambers 38.
- a nozzle chamber 38 of a cylindrical space having a constant diameter and extending straight is formed in the nozzle section 35 of FIG. 6, a nozzle chamber 38 of a cylindrical space having a constant diameter and extending straight is formed in the nozzle section 35 of FIG. 6, a nozzle chamber 38 of a cylindrical space having a constant diameter and extending straight is formed. Needless to say, the nozzle portion 35 having a different inclination angle of the side surface of the nozzle chamber 38 may be prepared. In the coating apparatus 1, the time required for coating the coating liquid can be further reduced by replacing the nozzle chamber 35 with the nozzle section 35 having a large volume.
- the volume of the coating liquid chamber 36 may be changed in addition to the volume of the nozzle chamber 38 by replacing the nozzle 35. Further, the nozzle portion 35 may not form a part of the space of the application liquid chamber 36. In the example of FIG. 7, the nozzle portion 35 has a plate shape, and the upper surface of the nozzle portion 35 is the bottom surface of the application liquid chamber 36.
- the nozzle part 35 which is a part of the coating head 3 can be replaced.
- the nozzle portion which is the entire coating head 3 can be replaced. Is also good. That is, in the coating apparatus 1, in the coating head 3, at least the nozzle section including the nozzle chamber 38 can be replaced with another nozzle section.
- the ejection mechanism that ejects the droplet from the ejection port 381 may be other than the pressurizing unit 34 including the piezoelectric element 341.
- the discharge mechanism may be a heating unit that discharges droplets from the discharge port 381 by heating the coating liquid in the coating liquid chamber 36.
- the ejection operation is performed according to the ejection parameters determined by the ejection parameter determination unit 101. Accordingly, during the continuous discharge period, during the period except when the coating liquid in the coating liquid chamber 36 is heated, that is, during the period except when discharging the droplet of the coating liquid, the liquid level M of the coating liquid stays in the nozzle chamber 38. It is formed.
- a coating apparatus having a discharge mechanism for discharging liquid droplets by pressurizing or heating a coating liquid.
- the stage 21 may be fixed, and the coating head 3 may be moved by a moving mechanism. That is, the moving mechanism may move the object 9 to which the application liquid is applied relative to the application head 3.
- the coating device according to the present invention can be used for various applications.
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- Coating Apparatus (AREA)
Abstract
Description
Claims (9)
- 吐出口から塗布液の液滴を吐出する塗布ヘッドと、 前記塗布ヘッドに前記塗布液を供給する塗布液供給部と、 前記塗布ヘッドからの前記液滴の吐出を制御する制御部と、を備え、 前記塗布ヘッドが、 前記塗布液が充填される塗布液室と、 前記塗布液室から連続する流路であり、先端開口が前記吐出口であるノズル室と、 前記吐出口から前記液滴を吐出させる吐出機構と、を備え、 前記制御部が、前記塗布ヘッドにおける吐出動作に並行して前記塗布液供給部から前記塗布液室内に補給可能な前記塗布液の単位時間当たりの体積を補給流量として、前記補給流量および前記ノズル室の容積に基づいて、前記塗布ヘッドから前記液滴が連続的に吐出される連続吐出期間における吐出パラメータを決定する吐出パラメータ決定部を備え、 前記連続吐出期間が、前記吐出口から吐出される前記塗布液の単位時間当たりの体積が前記補給流量よりも大きい増量吐出期間を含み、かつ、前記連続吐出期間において前記吐出口から吐出される前記塗布液の総体積が、前記ノズル室の容積と、前記連続吐出期間に前記塗布液供給部から前記塗布液室内に補給される前記塗布液の総体積との和以下である、塗布装置。
- 前記連続吐出期間における前記液滴の吐出時を除く期間において、前記塗布液の液面が前記ノズル室内に形成される、請求項1に記載の塗布装置。
- 前記連続吐出期間において、前記吐出口から吐出される前記塗布液の単位時間当たりの体積が、前記補給流量以下の一定量である定量吐出期間が設定されており、前記連続吐出期間における初期が前記増量吐出期間であり、残りの期間が前記定量吐出期間である、請求項1または2に記載の塗布装置。
- 前記吐出パラメータ決定部が、対象物上の各位置に塗布すべき前記塗布液の塗布量を示す塗布指令を受け付けるとともに、前記塗布指令に基づいて、前記各位置に対する前記連続吐出期間における前記吐出パラメータを決定する、請求項1ないし3のいずれか1つに記載の塗布装置。
- 前記塗布ヘッドにおいて、少なくとも前記ノズル室を含むノズル部が、他のノズル部に交換可能であり、 前記他のノズル部における前記ノズル室の容積が、前記ノズル部におけるノズル室の容積と相違する、請求項1ないし4のいずれか1つに記載の塗布装置。
- 前記制御部において、複数種類のノズル部におけるノズル室の容積を示すノズル室情報が記憶され、 前記吐出パラメータ決定部が、前記塗布ヘッドに設けられるノズル部の種類の入力を受け付けるとともに、前記入力および前記ノズル室情報に基づいて、前記塗布ヘッドにおける前記ノズル室の容積を取得する、請求項5に記載の塗布装置。
- 前記塗布ヘッドに設けられる前記ノズル部の種類を識別するノズル識別部をさらに備え、 前記ノズル識別部における識別結果が、前記入力として前記吐出パラメータ決定部において受け付けられる、請求項6に記載の塗布装置。
- 前記制御部において、複数種類の塗布液における補給流量を示す補給流量情報が記憶され、 前記吐出パラメータ決定部が、前記塗布液供給部から前記塗布ヘッドに供給される塗布液の種類の入力を受け付けるとともに、前記入力および前記補給流量情報に基づいて、前記塗布液の前記補給流量を取得する、請求項1ないし7のいずれか1つに記載の塗布装置。
- 前記ノズル室の前記流路の直径が、前記塗布液室側から前記吐出口に向かって漸次減少する、請求項1ないし8のいずれか1つに記載の塗布装置。
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