HK1230541B - Application device and application method - Google Patents

Description

Coating device and coating method

Technical Field

The present invention relates to a coating device and a coating method having a plurality of discharge ports arranged in a straight line.

Background Art

As a device for dispensing liquid materials in the manufacturing process of electronic components, etc., a dispensing device (dispenser) that discharges liquid materials using a reciprocating plunger is known. For example, this dispensing device is used to apply a desired coating to a workpiece while moving horizontally relative to a worktable.

As an existing discharging device for causing a liquid material to separate from a nozzle and land on a workpiece, for example, there is a device that has a side surface of a plunger rod arranged non-contactly in a flow path having a valve seat near an outlet connected to the nozzle, and the front end of the plunger rod moves toward the valve seat and abuts the valve seat, thereby causing the liquid material to be discharged from the nozzle in the form of droplets (Patent Document 1).

In addition, as a technology for causing a rapidly advancing plunger to stop suddenly without abutting against a valve seat so that the liquid material flies and drips, there is a method and device for discharging liquid material proposed by the applicant, in which a plunger for discharging liquid material is advanced at high speed, and then the plunger driving mechanism is stopped suddenly, and an inertial force is applied to the liquid material to cause the liquid material to be discharged (patent documents 2 and 3).

In addition, a jet dispensing machine is proposed that has a spray nozzle having multiple nozzle outlets connected to the fluid channel outlet and a valve member that is movably arranged in the fluid channel and can selectively contact the valve seat. When the valve member contacts the valve seat, a sufficient amount of motion is imparted to the liquid material in the above-mentioned fluid channel outlet for causing multiple droplets to be ejected simultaneously and rapidly from the above-mentioned multiple nozzle outlets (patent document 4).

Prior art literature

Patent Literature

Patent Document 1: Japanese Patent Application No. 2001-500962

Patent Document 2: Japanese Patent Application Laid-Open No. 2003-190871

Patent Document 3: Japanese Patent Application Laid-Open No. 2005-296700

Patent Document 4: Japanese Patent Application Laid-Open No. 2007-167844

Summary of the Invention

Problems to be solved by the invention

In order to reduce the manufacturing cost of electronic devices and the like, it is required to increase the speed of scribing coating.

The jet dispensing machine disclosed in Patent Document 4 features a nozzle with multiple discharge ports, but its primary purpose is to form a flux layer and has no reference to the operation of line coating. Furthermore, even though Patent Document 4 aims to achieve higher quality by slowing down the dispenser's operating speed (see paragraph [0007] of the same document), it cannot be said that the invention provides technology that contributes to faster line coating.

An object of the present invention is to provide a coating device and a coating method capable of increasing the speed of line coating.

Technical means to solve the problem

The present invention relates to a coating method, characterized in that it is a method for linearly coating a drawing line on a coating object using a coating device, wherein the coating device comprises: a discharge device; a workbench on which the coating object is placed; a drive device that moves the discharge device and the workbench relative to each other; and a control unit that controls the operation of the discharge device and the drive device, wherein the discharge device comprises: a nozzle having a plurality of discharge ports for discharging a liquid material; a liquid chamber that is connected to the plurality of discharge ports via a plurality of discharge flow paths; and a discharge member that is in contact with the liquid in the liquid chamber. The liquid material in the liquid chamber is brought into contact with the material, and the liquid material is simultaneously discharged from the multiple discharge ports by the discharge member, and multiple droplets are formed on the coating object. The multiple discharge ports are arranged on the nozzle along a straight nozzle configuration line, so that the nozzle configuration line is consistent with the drawing direction of the drawing line. The liquid material is discharged from the multiple discharge ports to perform linear coating in a manner such that the multiple discharged liquid blocks do not contact each other before landing on the coating object, and the liquid materials landed along the nozzle configuration line are combined on the coating object.

In the present invention involving the above-mentioned coating method, it may be characterized in that the control unit controls the timing of discharge to be constant intervals _Tc according to the relative movement speed of the discharge device and the worktable, so as to perform linear coating in a manner such that at least one of the plurality of discharged liquid blocks combines with the liquid material on the coating object immediately before discharge to form a drawing line while relatively moving the discharge device and the worktable at a constant speed _Vc .

The present invention involving the above-mentioned coating method may also be characterized in that, by adjusting the propulsion force of the above-mentioned discharging member, the liquid material is discharged in such a manner that the above-mentioned multiple liquid blocks do not contact each other before landing on the coating object, and the liquid materials landing along the above-mentioned nozzle arrangement line are combined on the coating object.

In the present invention involved in the above-mentioned coating method, its feature may also be that the above-mentioned multiple discharge flow paths are arranged at an inclination in a manner such that the center lines of each of the above-mentioned multiple discharge flow paths intersect with the center line of the above-mentioned nozzle, and the distance between the droplets is adjusted by adjusting the distance h between the discharge port and the coating object.

In the present invention related to the above-mentioned coating method, any one of the plurality of discharge ports may be arranged on the nozzle arrangement line.

In the present invention related to the above-mentioned coating method, the plurality of discharge ports may be characterized in that they all have the same shape and are arranged at equal intervals.

In the present invention involved in the above-mentioned coating method, its feature may also be that the above-mentioned multiple ejection ports are composed of an even number of ejection ports, including two large ejection ports and two small ejection ports, any one of the ejection ports is arranged on the above-mentioned nozzle configuration line, and the above-mentioned small ejection ports and the above-mentioned large ejection ports are alternately arranged along the above-mentioned nozzle configuration line, or the above-mentioned multiple ejection ports are composed of an even number of ejection ports, including two large ejection ports and two small ejection port groups, any one of the above-mentioned large ejection ports is arranged on the above-mentioned nozzle configuration line, the above-mentioned small ejection port group and the above-mentioned large ejection port are alternately arranged along the above-mentioned nozzle configuration line, and the above-mentioned small ejection port group is composed of a plurality of small ejection ports arranged symmetrically with respect to the above-mentioned nozzle configuration line.

In the present invention involved in the above-mentioned coating method, it can also be characterized in that the above-mentioned discharging device or the above-mentioned workbench has a rotating mechanism, and the above-mentioned rotating mechanism makes the above-mentioned nozzle configuration line consistent with the drawing direction of the above-mentioned drawing line. Here, preferably, the above-mentioned linear coating is carried out according to a coating pattern including a linear coating line extending in a first direction and a linear coating line extending in a second direction different from the first direction.

The present invention involving the above-mentioned coating method may be characterized in that the nozzle is detachably fixed relative to the above-mentioned discharge device, and the above-mentioned discharge device has a positioning mechanism capable of installing the nozzle in a manner such that the direction of the nozzle arrangement line is fixed relative to the above-mentioned discharge device.

The present invention relates to a coating apparatus, characterized by comprising a discharge device, a worktable on which an object to be coated is placed, a drive device for relatively moving the discharge device and the worktable, and a control unit for controlling the operation of the discharge device and the drive unit. The discharge device comprises: a nozzle having a plurality of discharge ports for discharging a liquid material; a liquid chamber connected to the plurality of discharge ports via a plurality of discharge flow paths; and a discharge member in contact with the liquid material in the liquid chamber, wherein the discharge member imparts an inertial force to the liquid material in the liquid chamber, causing the liquid material to be simultaneously discharged from the plurality of discharge ports to form a plurality of liquid droplets on the object to be coated. The plurality of discharge ports are arranged along a linear nozzle arrangement line relative to the nozzle. The control unit discharges the liquid material from the plurality of discharge ports to perform linear coating, with the nozzle arrangement line aligned with a drawing direction of a drawing line, so that the plurality of discharged liquid clumps do not contact each other before landing on the object to be coated, and the liquid material landing along the nozzle arrangement line is combined on the object to be coated.

In the present invention involving the above-mentioned coating device, it may be characterized in that the above-mentioned control unit is configured to perform linear coating by setting the timing of discharge at a constant interval _Tc according to the relative movement speed of the above-mentioned discharge device and the above-mentioned worktable so as to move the above-mentioned discharge device and the above-mentioned worktable relative to each other at a constant speed _Vc in the same direction as the nozzle arrangement line, so that at least one of the plurality of discharged liquid blocks combines with the liquid material on the coating object immediately before discharge to form a drawing line.

In the present invention involving the above-mentioned coating device, it can also be characterized in that the above-mentioned control unit adjusts the propulsion force of the above-mentioned discharging member to discharge the liquid material in a manner such that the multiple liquid blocks discharged do not contact each other before landing on the coating object, and the liquid materials landing along the above-mentioned nozzle configuration line are combined on the coating object.

In the present invention related to the coating apparatus described above, the plurality of discharge flow paths may be arranged with an inclination such that each center line of the plurality of discharge flow paths intersects with a center line of the nozzle.

In the present invention related to the coating apparatus described above, any one of the plurality of discharge ports may be arranged on the nozzle arrangement line.

In the present invention related to the coating device described above, the plurality of discharge ports may have the same shape and be arranged at equal intervals.

In the present invention involved in the above-mentioned coating device, its feature may also be that the above-mentioned multiple outlets are composed of an even number of outlets, including two large outlets and two small outlets, any one of the outlets is arranged on the above-mentioned nozzle configuration line, and the above-mentioned small outlets and the above-mentioned large outlets are alternately arranged along the above-mentioned nozzle configuration line, or the above-mentioned multiple outlets are composed of an even number of outlets, including two large outlets and two small outlet groups, any one of the above-mentioned large outlets is arranged on the above-mentioned nozzle configuration line, the above-mentioned small outlet group and the above-mentioned large outlet are alternately arranged along the above-mentioned nozzle configuration line, and the above-mentioned small outlet group is composed of a plurality of small outlets arranged symmetrically with respect to the above-mentioned nozzle configuration line.

In the present invention related to the coating apparatus, the discharge device or the table may include a rotation mechanism, and the control unit may align the drawing direction of the nozzle arrangement line with that of the drawing line by using the rotation mechanism.

In the present invention related to the coating device, the driving device may include a uniaxial driving mechanism capable of linearly moving the discharge device and the worktable relative to each other, and the nozzle arrangement line may be arranged to coincide with a driving direction of the uniaxial driving mechanism.

The present invention involving the coating device may be characterized in that the nozzle is detachably fixed to the discharge device, and the discharge device has a positioning mechanism capable of mounting the nozzle in a fixed direction relative to the discharge device along the nozzle arrangement line.

In the present invention involved in the above-mentioned coating device, its feature may also be that the above-mentioned discharging device includes: a plunger having a smaller diameter than the above-mentioned liquid chamber, and a front end portion that moves forward and backward in the liquid chamber; a plunger reciprocating movement device that causes the above-mentioned plunger to move forward and backward; and a liquid feeding device that supplies liquid material to the above-mentioned liquid chamber; in a state where the side surface of the front end portion of the above-mentioned plunger is non-contacting with the inner wall of the above-mentioned liquid chamber, the plunger is moved into and stopped, thereby giving inertial force to the liquid material and discharging it simultaneously from the above-mentioned multiple discharge ports.

Effects of the Invention

According to the present invention, the speed of line coating can be increased.

Furthermore, by setting the ejection timing to a constant interval _Tc and performing linear coating, the ejection amount accuracy and ejection position accuracy can be improved.

Furthermore, according to the present invention having a structure in which the discharge flow path has an inclination, the distance between the simultaneously discharged droplets can be adjusted by adjusting the distance between the discharge port and the coating object.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a perspective view showing a coating apparatus according to a first embodiment.

FIG2 is a side cross-sectional view of a main part of the discharge device according to the first embodiment.

FIG3 is a bottom view (a) and a side cross-sectional view (b) of the nozzle member according to the first embodiment.

Figure 4 is a diagram showing a single discharging process in the first embodiment, (a) shows the moment before the discharged droplets land on the coating object, (b) shows the moment when the discharged droplets land on the coating object, (c) shows the moment a short time has passed after the landing, (d) shows the moment a short time has passed since the moment of (c), and (e) shows the moment a short time has passed since the moment of (d).

Figure 5 is a diagram showing multiple discharging processes of the coating device of the first embodiment, (a) is a diagram viewed from the side at the moment just after the first emission, (b) is a diagram viewed from the side and above at the moment just after the second emission, (c) is a diagram viewed from the side and above at the moment just after the third emission, (d) is a diagram viewed from the side and above at the moment just after the fourth emission, and (e) is a diagram viewed from the side and above at the moment just after the fifth emission.

FIG6 is a side view illustrating the merging of two droplets in flight. (a) shows the moment immediately after the liquid block is ejected, (b) shows the moment a short time has passed since (a), and (c) shows the moment when the simultaneously ejected liquid block lands on the coating object.

FIG7 is a (a) bottom view and (b) side cross-sectional view of a nozzle member according to a second embodiment.

FIG8 is a bottom view of a nozzle member according to a third embodiment.

FIG. 9 is an imaginary view showing a state in which four liquid droplets discharged simultaneously merge in the third embodiment, as viewed from above.

FIG10 is a bottom view of a nozzle member according to a fourth embodiment.

FIG. 11 is an imaginary view showing the state of six liquid droplets discharged simultaneously coalescing in the fourth embodiment, as viewed from above.

12 is (a) a side sectional view of a nozzle member according to a fifth embodiment, and (b) a side view illustrating the relationship between the distance between the discharge port and the workpiece and the distance between liquid droplets.

FIG13 is an explanatory diagram of a coating method in which two liquid droplets land on a coating object and do not combine on the coating object, wherein (a) shows the first discharge, (b) shows the second discharge, (c) shows the third discharge, and (d) shows the fourth discharge.

DETAILED DESCRIPTION

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

First Implementation Example

＜Coating device＞

As shown in FIG1 , a coating apparatus 200 according to a first embodiment includes: a discharging apparatus 1; a base 201; a worktable 202 on which a coating object 207 is placed; an X-drive device 203 for moving the discharging apparatus and the worktable relative to each other in the X direction; a Y-drive device 204 for moving the discharging apparatus and the worktable relative to each other in the Y direction; a Z-drive device 205 for moving the discharging apparatus and the worktable relative to each other in the Z direction; and a control device 206 for controlling the operation of the discharging apparatus 1 and the XYZ-drive devices (203, 204, 205).

Furthermore, the X direction refers to one direction in a plane, the Y direction refers to a direction in the plane that is perpendicular to the X direction, and the Z direction refers to a direction perpendicular to the plane.

In this embodiment, the X-drive and Y-drive devices move in the horizontal direction, while the Z-drive device moves in the vertical direction. However, other movement directions are also possible. Furthermore, not all of the X-drive, Y-drive, and Z-drive devices are required. For example, if the coating pattern consists of only straight lines in one direction, coating according to the present invention can be performed by arranging only a drive device that moves in one direction (only the X-drive or the Y-drive).

<Discharge device>

As shown in FIG. 2 , the main body of the discharge device 1 is configured to include a main body upper portion 2 and a main body lower portion 3 .

The upper portion 2 of the main body has a through hole 21 extending through the center and a piston chamber (22, 23), and the plunger 10 is inserted into the through hole 21 and the piston chamber. The plunger 10 is a slender cylindrical rod that passes through the piston 11. The piston 11 is a disc-shaped component having an annular sealing component 12 provided on the side circumference. The piston 11 airtightly separates the cylindrical piston chamber into a lower chamber 22 and an upper chamber 23, and moves up and down while sliding in the piston chamber. The piston 11 is connected to the plunger 10, and as the piston 11 moves up and down, the plunger 10 also moves up and down. Hereinafter, the downward movement of the plunger 10 is referred to as an entry movement, and the upward movement of the plunger 10 is referred to as a retreat movement.

The piston 11 is urged downward by the elastic member 13 disposed in the upper chamber 23. A lower air vent 24 connected to the electromagnetic switching valve 16 is provided on the side of the lower chamber 22, and an annular sealing member 26 through which the plunger 10 is inserted is provided on the bottom surface of the lower chamber 22. The electromagnetic switching valve 16 has a first position in which the lower air vent 24 is connected to the gas supply source 19, and a second position in which the lower air vent 24 is connected to the outside air. When the electromagnetic switching valve 16 is in the first position, the pressurized gas supplied from the gas supply source 19 is supplied to the lower air vent 24 via the regulator 18, and the front end face 103 of the plunger moves away from the bottom surface 412 of the liquid chamber. When the electromagnetic switching valve 16 is in the second position, the piston 11 moves downward by the force of the elastic member 13, and the plunger 10 moves inward together with the downward movement of the piston 11. As a result, the plunger front end surface 103 is seated on the bottom surface 412 of the liquid chamber, and the liquid material in the liquid chamber, to which the propulsive force is applied by the plunger 10, is discharged from the discharge ports (51, 52).

Furthermore, a configuration may be employed in which the plunger 10 is stopped immediately before the plunger front end face 103 seats on the bottom surface 412 of the liquid chamber, thereby imparting a propulsive force to the liquid material in the liquid chamber and causing it to be discharged. Examples of a discharge device that discharges liquid droplets without seating the plunger front end face include those disclosed in WO 2008/108097 and Japanese Patent Application Laid-Open No. 2013-081884 by the applicant.

In this embodiment, the plunger 10 is used as a discharge member for imparting inertial force to the liquid material in the liquid chamber, but the discharge member is not limited thereto. The discharge member of the present invention also includes, for example, a mechanism for generating pressure in the liquid chamber connected to the discharge port, such as a movable valve body, an electrostatic or piezoelectric actuator, a diaphragm, a forced deformation mechanism (e.g., a combination of a hammer or solenoid with a rod, or a high-pressure fluid), a bubble generating heater, and the like.

Liquid material is continuously discharged by repeatedly moving the front end 101 located below the plunger 10 forward and backward within the liquid chamber. During this movement of the plunger 10, the side surface 102 of the front end of the plunger does not contact the inner wall 411 of the liquid chamber (see FIG3( b )). In this embodiment, the plunger front end surface 103 is hemispherical, but the shape of the plunger front end surface 103 is not limited to this. For example, it may be a flat surface or a flat surface with the same number of protrusions as the discharge port, concentric with the discharge port.

The retracted position of the plunger 10 is defined by a stopper 14. The position of the stopper 14 can be adjusted by rotating a micrometer 15.

The main body lower portion 3 is joined to the lower end of the main body upper portion 2. The main body lower portion 3 has a through hole 31 extending through the center, and a plunger 10 is inserted into the through hole 31. The through hole 31 is connected to the liquid chamber 41, but an annular sealing member 32 is provided at the lower end of the through hole 31, so that the liquid material in the liquid chamber does not flow back toward the through hole 31. The liquid chamber 41 is a cylindrical space extending up and down, and is connected to a supply path 33 for supplying liquid material at the upper part. The supply path 33 is connected to the liquid supply path 61 of the liquid supply member 6 via the liquid supply path 42 provided on the mounting member 4. In the present embodiment, the supply path 33, the liquid supply path 42 and the liquid supply path 61 are configured horizontally, but they can also be configured at an angle.

As shown in FIG3(a), the nozzle member 5 includes a first discharge port 51 and a second discharge port 52, each of the same diameter and circular, disposed on a straight nozzle arrangement line 20. The diameter _D1 of the first discharge port 51 and the second discharge port 52 is, for example, several μm to several mm, preferably tens to hundreds of μm. The shapes of the first discharge port 51 and the second discharge port 52 are not limited to the circular shapes shown in the example; for example, an elliptical shape extending along the nozzle arrangement line 20 is disclosed. The shapes and even the arrangement pattern of the multiple discharge ports are preferably symmetrical with respect to the nozzle arrangement line 20. This also applies to the case where the lower end of the nozzle member 5 is not flat but has a concave-convex shape.

The closest distance L ₁ between the first and second discharge ports 51, 52 (the distance between the right end of the first discharge port 51 and the left end of the second discharge port 52) is set to be larger than the diameter D ₁ in all cases, for example, 2 to 10 times D _1. In other words, this is the distance at which the multiple discharge ports are arranged on the nozzle member along a linear nozzle arrangement line and the liquid material that lands on the coating object combines to form a coating line.

When the discharge device 1 is mounted on the coating device 200, the nozzle configuration line 20 is configured to be consistent with the drawing direction of the drawing line. A rotating mechanism that rotates in the θ direction (the rotation direction centered on the vertical line of the workbench) can also be set on the workbench 202 or the discharge device 1 so that the nozzle configuration line 20 and the drawing direction of the drawing line can be dynamically consistent. Here, the meaning of making the nozzle configuration line 20 consistent with the drawing direction of the drawing line is, in other words, when the nozzle configuration line is projected onto the drawing line, the drawing line and the direction of the nozzle configuration line are consistent, or when the nozzle configuration line 20 and the drawing line are projected orthographically onto a plane that is at right angles to the discharge direction of the liquid material, the nozzle configuration line 20 and the direction of the drawing line are consistent. In other words, there is a drawing line on the plane containing the discharge direction of the liquid material discharged from the discharge port. This can also be applied to cases where the surface of the coating object is not flat or tilted.

Here, the discharge direction of the liquid material in this embodiment more accurately refers to the discharge direction of the liquid material when the relative movement between the worktable and the discharge device is stopped and the liquid material is discharged. As in this embodiment, when the discharge direction of the liquid material is equal to the vertical direction, the line at right angles to the discharge direction of the liquid material is a line on the horizontal plane.

On the other hand, when the coating pattern is composed of multiple straight lines with curved portions, a rotation mechanism that rotates in the θ direction must be provided on the worktable 202 or the Z-axis drive device 205. For example, when the coating pattern is a quadrilateral with one vertex of the quadrilateral serving as the coating start and end points, there are three curved portions. The rotation mechanism can be constructed using, for example, a known servo motor.

Furthermore, when the coating pattern has a straight portion, the coating object is placed on the workpiece 202 so that the direction of the straight portion aligns with the X or Y direction, and the nozzle arrangement line 20 is arranged so that it is oriented in the same direction as the straight portion. Thus, when coating the straight portion, only one of the X drive unit 203 or the Y drive unit 204 can be driven to perform coating, thereby achieving more precise coating and formation of the coating line.

That is, when the XYZ drive device (203, 204, 205) includes a single-axis drive device (X drive device or Y drive device) that can linearly move the discharge device 1 and the worktable 202 relative to each other, it is preferable to arrange the nozzle arrangement line 20 so that the driving direction (X direction or Y direction) of the single-axis drive device is aligned. This arrangement is particularly effective when the above-mentioned rotation mechanism is not provided.

As shown in FIG3(b), the first discharge port 51 communicates with the liquid chamber 41 via a first discharge flow path 54 having a small diameter and a discharge flow path 57 having a large diameter. Furthermore, the second discharge port 52 communicates with the liquid chamber 41 via a second discharge flow path 55 having a small diameter and a discharge flow path 57 having a large diameter. The first discharge flow path 54 and the second discharge flow path 55 have the same shape, and both have their central axes located in the vertical direction.

The first discharge flow path 54 and the second discharge flow path 55 may be configured to communicate directly with the liquid chamber 41 without providing the large-diameter discharge flow path 57. Alternatively, the first discharge flow path 54 and the second discharge flow path 55 may be configured to communicate directly with the liquid chamber 41 by two independent small-diameter flow paths and a large-diameter flow path.

The first discharge port 51 and the second discharge port 52 provided on the lower end surface of the planar nozzle member 5 are open downward, and the liquid material drips from these discharge ports when the lower end surface of the nozzle member 5 is arranged horizontally (at right angles to the discharge direction of the liquid material).

The nozzle member 5 has a flange portion 58 at the upper end, and is supported on the mounting member 4 by the flange portion 58. The mounting member 4 is screwed to the lower part 3 of the main body or fixed in a detachable manner by a fixing member such as a screw while supporting the nozzle member 5. Since the nozzle member 5 is detachably mounted by the mounting member 4, it is easy to replace multiple nozzle members 5 with different discharge port diameters and closest distances according to the intended use. There is no restriction on the method for mounting and removing the nozzle member 5, but it is preferable to provide a positioning mechanism that can be installed in a manner such that the direction and position of the nozzle configuration line 20 are fixed relative to the discharge device 1. As the positioning mechanism, a well-known positioning mechanism can be used, for example, a structure in which a part of the member on the side of the nozzle member 5 or the lower part 3 of the main body (for example, a pin, a protrusion, a notch) is engaged with the member on the other side for positioning, or a structure in which a separately prepared member (for example, a pin or a screw) is used for positioning.

A liquid supply member 6 is fixedly mounted on the side of the mounting member 4. A liquid storage container 7 is connected to the upper surface of the liquid supply member 6. The liquid storage container 7 receives a supply of pressurized gas from a gas supply source 9 via a pneumatic dispenser 8. The pressurized gas supplied from the gas supply source 9 may be a gas other than atmospheric air (e.g., nitrogen).

<XYZ drive unit>

The XYZ drive devices (203, 204, 205) are configured, for example, with known XYZ axis servo motors and ball screws, and can move the discharge ports (51, 52) of the discharge device 1 to any position on the workpiece at any speed. The operation of the XYZ drive devices (203, 204, 205) is controlled by a control device 206.

＜Control device＞

The control device 206 is composed of a processing device, a storage device for storing a coating program, and an input device. For example, a personal computer or a programmable controller can be used. The control device 206 can be completely built into the base 201, or a part of it can be set outside the base 201 and connected by wire or wireless. The control device 206 receives coating control data including a coating pattern, a coating reference position, a relative movement speed, a discharge timing, and a plunger advance and retreat speed from the input device, and stores it in the storage device. The processing device reads the coating control data stored in the storage device and performs the coating action described below.

＜Coating action＞

The coating operation of the coating device 200 is linear coating (line coating) in the X direction, the Y direction, or an oblique direction (a direction forming an angle with the X direction or the Y direction), and is performed as follows.

FIG4(a) shows the moment when droplets (151, 152) are discharged from the discharge port (51, 52) of the nozzle member 5 and before they land on the coating object (workpiece). As shown in the figure, in the present invention, it is assumed that the discharged liquid material is in the state of droplets on the workpiece. Here, the liquid material discharged from the discharge port (51, 52) may form droplets after separating from the discharge port, or may separate from the discharge port after contacting the workpiece and form droplets on the coating object. In this specification, the liquid material discharged from the discharge port and before it separates from the discharge port, and the droplets discharged from the discharge port and separated before they land on the workpiece are sometimes collectively referred to as "liquid blocks".

A coating method in which a liquid material contacts a workpiece and then separates from a discharge port, thereby forming droplets on the coating object, is disclosed, for example, in WO2008/146464. To separate the liquid material from the discharge port after contacting the coating object, the discharge operation is preferably performed with the distance _h1 between the discharge port and the workpiece smaller than several _times the height h0 of the liquid material when the discharge port (nozzle) is connected to the workpiece before contact. More preferably, the distance _h1 between the discharge port and the workpiece is set to less than twice _h0 ( _h0 < _h1 < _h0 × 2).

In order for two droplets that land in close proximity on an object to spread and coalesce quickly, a certain level of propulsion must be imparted to the droplets. However, experimental results have confirmed that droplets ejected from conventional jet-type dispensing devices do not impart sufficient propulsion to achieve rapid coalescence after landing.

In addition to the above, it is also important that the multiple liquid masses ejected simultaneously do not touch or combine before landing. This is because if the droplets touch or combine before landing, the droplets will become larger, making it impossible to achieve the desired coating pattern. Specifically, as shown in Figure 6, if two droplets combine in flight, the landing surface becomes circular, and droplets of the same size that partially overlap the landing liquid do not land, thus preventing linear coating (essentially, the same as coating operations performed from a single ejection port). Because the conditions for ejecting multiple liquid masses ejected simultaneously from multiple ejection ports in a manner that prevents them from touching before landing on the coating object and in which the landing liquids that land along the nozzle arrangement line 20 combine on the coating object vary depending on the operating environment, such as the type of liquid material and the structure of the ejection device, it is necessary to find the conditions by repeatedly ejecting while changing the conditions of each factor according to the operating environment. Whenever this operation is performed, the main factors to be considered include the distance between the discharge ports, the size of the discharge port hole, the viscosity of the liquid material, and the magnitude of the propulsion force of the discharge member (of course, other factors can also be adjusted). In addition, as described in the fifth embodiment below, it is also effective to set the conditions by adjusting the distance between the discharge port and the coating object.

Figure 4(b) shows the moment when the simultaneously ejected liquid masses land on the coating object. As shown in the figure, the liquid materials ejected from the two discharge ports (51, 52) are in a non-contacting position when landing. In other words, the liquid materials ejected from the multiple discharge ports form the same number of droplets as the number of discharge ports, and land on the coating object without contacting each other.

Figure 4(c) shows the moment a short time has passed since the simultaneously ejected liquid droplets landed on the coating object. As shown in the figure, the circular droplets spread on the coating object, and the two circles come into contact and begin to merge.

Figure 4(d) shows a moment a short time after the moment in Figure 4(c). As shown, the two contacting circles merge further, and the depression in the width direction (vertical direction in the figure) becomes shallower. In other words, the merging of two droplets on the coating object, unlike the merging of two droplets in flight, occurs by forming an elongated shape extending toward the nozzle arrangement line 20 (even after the two droplets merge, they do not form a circle when viewed from above).

Fig. 4(e) shows a moment after a short time has passed since the moment in Fig. 4(d). As shown in the figure, the two circles are completely combined and the unevenness in the coating width disappears, forming a linear elongated coating pattern extending in the same direction as the nozzle arrangement line 20.

4( a ) to 4 ( e ) are diagrams showing a process of applying a line of a predetermined length (minimum unit) by a single discharge. By repeating this process, a coating line of a desired length can be formed.

FIG. 5( a ) to FIG. 5( e ) are diagrams showing the process of linear coating by multiple discharges.

FIG5(a) is a side view showing the time immediately after the first shot.

Fig. 5(b) is a side and top view of the moment immediately after the second shot is performed. At this moment, the two droplets involved in the first shot begin to combine on the coating object.

Figure 5(c) shows the moment immediately after the third shot, as viewed from the side and above. At this moment, the two droplets involved in the first shot have further coalesced, and the two droplets involved in the second shot have begun to coalesce on the coating object.

Figure 5(d) shows the moment immediately after the fourth shot, as viewed from the side and above. At this point, the two droplets involved in the first shot have completely coalesced, the two droplets involved in the second shot have further coalesced, and the two droplets involved in the third shot have begun to coalesce on the coating object.

Figure 5(e) shows the moment immediately after the fifth shot, as viewed from the side and above. At this point, the two droplets from the first and second shots have completely coalesced, the two droplets from the third shot have further coalesced, and the two droplets from the fourth shot have begun to coalesce on the coating object.

Thus, in this embodiment, by repeatedly performing a cycle of simultaneously discharging two liquid blocks, a desired coating line can be formed. The coating line referred to herein includes not only a straight coating line such as FIG4(e) that has no unevenness in the width direction (side edge in the long side direction) of the liquid material being coated, but also a coating line having unevenness in the width direction as disclosed in FIG4(c) or FIG4(d). In the case where the viscosity of the liquid material is relatively high, there are also cases where unevenness exists in the width direction of the coating line. For example, as in the case of coating an adhesive that is flattened during lamination, sometimes even a coating line having unevenness in the width direction can achieve the purpose. However, unevenness in the width direction causes bubbles, so it is preferable to control the amount of depression to be less than 1/3 of the radius of the droplet after diffusion.

Furthermore, the coating line is not a film uniformly formed on the surface of the coating object (workpiece), but is formed as a line raised on the surface.

The present invention is particularly effective in that it uses a nozzle having multiple discharge ports, moves the discharge device and the worktable relative to each other at a constant speed _Vc , and adjusts the discharge timing to a constant interval _Tc , thereby enabling linear coating. Stated another way, the present invention allows linear coating to be performed while the discharge device and the worktable are moved relative to each other at a constant speed and the plunger rod repeatedly performs a constant reciprocating motion. By adjusting the discharge timing to a constant interval _Tc , the discharge volume can be kept constant, improving the accuracy of the discharge volume and the discharge position. The interval _Tc is preferably such that at least one of the multiple liquid blocks discharged simultaneously from the multiple discharge ports combines with the liquid material (landing liquid) on the coating object just discharged, forming a linear coating pattern. Furthermore, this combination with the just discharged liquid material can occur simultaneously with landing or a short time after landing. The former often occurs when the just discharged liquid material has already spread on the coating object.

An example of a preferred interval _Tc is one in which _Vc × _Tc is the distance between adjacent discharge ports. This is because, when such an interval is set, the bonding state on the coating object of the line portion B formed by the bonding of multiple discharged liquid slugs and the line portion A formed by the bonding of multiple liquid slugs immediately before the discharge can be set to be the same as the bonding state of the multiple liquid slugs constituting the line portion A and the bonding state of the multiple liquid slugs constituting the line portion B, thereby achieving the effect of forming a uniform straight line.

Fig. 13 is an explanatory diagram of a coating method in which two droplets landed on an object to be coated do not combine with each other. In the figure, the straight lines indicate the positions of the discharge port 51 during each discharge.

Since the two droplets ejected in the first ejection (shown by a solid line and halftone dots) do not combine, two droplets (shown by a dashed line and halftone dots) must be ejected in the second ejection to connect the two droplets ejected in the first ejection. In the third ejection, two droplets (shown by a solid line and shaded lines) must be ejected to overlap with the droplet ejected in the direction of travel (right side) of the second ejection, so that the overlapping state of the ejected droplets is the same at all locations. In the fourth ejection, similar to the second ejection, two droplets (shown by a dashed line and shaded lines) must be ejected to connect with the two droplets ejected in the third ejection.

Thus, in the coating method of Figure 13, when the discharge device and the worktable are moved relative to each other at a constant speed, the problem of changing the timing of discharge occurs. On the other hand, if the relative movement speed of the discharge device and the worktable is changed, the problem of controlling the landing position of the droplets becomes difficult.

According to the coating apparatus and coating method of the first embodiment described above, two liquid slugs can be simultaneously discharged for linear coating. This allows the coating speed to be approximately doubled compared to linear coating performed by overlapping a single liquid slug. This increased speed of linear coating is particularly effective when performing linear coating, and for example, a significant speed-up effect can be achieved when the coating pattern consists of one or more straight lines.

Furthermore, by using a nozzle having a plurality of discharge ports and moving the discharge device and the stage relative to each other at a constant speed, high-precision linear coating can be performed while setting the discharge timing at a constant interval.

Second Implementation Example

The second embodiment differs from the first embodiment in that the nozzle member 5 of the discharge device 1 has three discharge ports arranged at equal intervals. The other structures are the same as those of the first embodiment. Hereinafter, description of the structures common to the first embodiment will be omitted, and the different structures will be described.

As shown in FIG7(a), the nozzle member 5 includes a first discharge port 51, a second discharge port 52, and a third discharge port 53, each of the same diameter and circular shape, arranged on a linear nozzle arrangement line 20. The diameter _D1 of the first to third discharge ports (51-53) is the same as that of the first embodiment. The closest distance _L1 between the first discharge port 51 and the second discharge port 52 (the distance between the right end of the first discharge port 51 and the left end of the second discharge port 52) and the closest distance L2 between the second discharge port 52 and the third discharge port 53 (the distance between the right end of the second discharge port 52 and the left end of the third discharge port ₅₃ ) are the same length. _L1 and _L2 are set to be larger than the diameter _D1 in all cases, for example, 2 to 10 times _D1 . When the discharge device 1 is mounted on the coating apparatus 200, the nozzle arrangement line 20 is arranged so that the direction of the desired drawing line (straight line) is aligned. Similar to the first embodiment, a rotation mechanism may be provided on the table 202 or the discharge device 1 to dynamically adjust the direction of the discharge port by the rotation mechanism.

As shown in FIG7(b), the first to third discharge ports (51-53) communicate with the liquid chamber 41 via the first discharge channel 54, the second discharge channel 55, the third discharge channel 56, and the large-diameter discharge channel 57. The first to third discharge channels (54-56) have the same shape, and their central axes are all located in the vertical direction. In other words, the first to third discharge channels (54-56) are arranged parallel to the vertical direction.

According to the second embodiment, a coating line having a length of three drops can be formed by a single discharge. In addition, in this embodiment, a nozzle member having three discharge ports arranged at equal intervals is disclosed, but the same effect can also be achieved in a nozzle member having four or more discharge ports of the same shape arranged at equal intervals.

Third Implementation Example

The third embodiment differs from the first and second embodiments in that the nozzle member 5 of the discharge device 1 has four discharge ports arranged at equal intervals. The remaining configurations are the same as those of the first and second embodiments. Hereinafter, descriptions of the configurations common to the first and second embodiments will be omitted, and the configurations that differ will be described.

As shown in FIG8 , the nozzle member 5 includes a first large circular outlet 71 and a second large circular outlet 72, and a third small circular outlet 73 and a fourth small circular outlet 74, arranged on a linear nozzle arrangement line 20. The diameter D ₁ of the first outlet 71 and the second outlet 72 is, for example, tens of μm to several mm. The diameter D ₂ of the third outlet 73 and the fourth outlet 74 is 1/2 to 1/10 of the diameter D ₁ , for example, several μm to several hundred μm. The large circular outlets and the small circular outlets are alternately arranged on the nozzle arrangement line 20 at substantially equal intervals.

The third discharge port 73 is arranged at a point midway between the closest distance _L1 between the first discharge port 71 and the second discharge port 72 (the distance between the right end of the first discharge port 71 and the left end of the second discharge port 72). The closest distance _L2 between the first discharge port 71 and the third discharge port 73 is set to be larger than the diameter _D1 in all cases, for example, 2 to 10 times _D1 . The fourth discharge port 74 is arranged symmetrically with the third discharge port 73 relative to the second discharge port 72. That is, the closest distance _L3 between the second discharge port 72 and the fourth discharge port 74 is the same as _L2 . When the discharge device 1 is mounted on the coating device 200, the nozzle configuration line 20 is arranged to be consistent with the direction of the desired drawing line (straight line). As in the first embodiment, a rotation mechanism may be provided on the workbench 202 or the discharge device 1 to dynamically adjust the direction of the discharge port by the rotation mechanism.

FIG9 is an imaginary diagram of the situation in which four liquid blocks ejected simultaneously from the 1st to 4th discharge ports (71 to 74) land and spread on the coating object. As shown in the upper part of FIG9 , the four droplets (171 to 174) ejected simultaneously from the 1st to 4th discharge ports (71 to 74) are independent circular droplets when viewed from above when they land. As shown in the middle part of FIG9 , if a short time has passed after landing, the four droplets (171 to 174) spread separately and begin to combine. Here, the two auxiliary droplets 173 to 174 act in a manner that promotes the combination of the basic droplets 171 to 172. Finally, as shown in the lower part of FIG9 , the four circles are completely combined to eliminate the unevenness of the coating width, forming a straight, elongated coating pattern extending in the same direction as the nozzle configuration line 20.

Furthermore, each discharge port is preferably circular, but the effects of the present invention can also be achieved with shapes other than circular. In addition, when the discharge port is composed of holes of multiple sizes, it is preferred that at least the largest discharge port is of the same shape and size. More preferably, the discharge port is composed of holes of multiple sizes by combining groups of discharge ports of the same shape and size (see Figures 8 and 10).

As described above, the two auxiliary droplets 173 - 174 act to promote the combination of the basic droplets 171 - 172 .

Example of the fourth embodiment

The fourth embodiment differs from the first to third embodiments in that the nozzle member 5 of the discharge device 1 has six discharge ports. Other configurations are the same as those of the first to third embodiments. Hereinafter, descriptions of configurations common to the first to third embodiments will be omitted, and only configurations that differ will be described.

As shown in FIG10 , the nozzle member 5 includes a first discharge port 81 and a second discharge port 82, both of large circular shapes of the same diameter, arranged on a linear nozzle arrangement line 20, and a third discharge port 83, a fourth discharge port 84, a fifth discharge port 85, and a sixth discharge port 86, all of small circular shapes of the same diameter, arranged along the nozzle arrangement line. The third discharge port 83 and the fourth discharge port 84 are symmetrically arranged with respect to the nozzle arrangement line 20, while the fifth discharge port 85 and the sixth discharge port 86 are symmetrically arranged with respect to the nozzle arrangement line 20. In other words, the first through sixth discharge ports (81 through 86) are symmetrically arranged with respect to the nozzle arrangement line 20. In other words, the plurality of discharge ports include a plurality of large circular discharge ports and a plurality of small circular discharge port groups, all of which are arranged on the nozzle arrangement line 20. The small circular discharge port groups are arranged alternately with the large circular discharge ports, and the small circular discharge port groups are composed of a plurality of small circular discharge ports symmetrically arranged with respect to the nozzle arrangement line 20.

The diameter _D1 of the first and second discharge ports 81, 82 is, for example, several tens of μm to several mm. The diameter _D2 of the third, fourth, fifth, and sixth discharge ports 83, 84, 85, and 86 is 1/2 to 1/10 of the diameter _D1 , for example, several μm to several hundred μm.

The third and fourth discharge ports 83 and 84 are arranged on a straight line perpendicular to the nozzle arrangement line 20 at a point midway between the closest distance _L1 between the first and second discharge ports 81, 82 (the distance between the right end of the first discharge port 81 and the left end of the second discharge port 82). The closest distance _L2 (= _L1 × 1/2) between the straight line perpendicular to the nozzle arrangement line 20 and the first and second discharge ports 81, 82 at the point midway between _L1 is set to be larger than the diameter _D1 in all cases, for example, 2 to 10 times _D1 .

The closest distances _L3 and _L2 between the second discharge port 72 and a straight line perpendicular to the nozzle arrangement line 20, where the fifth discharge port 85 and the sixth discharge port 86 are arranged, are the same. When the discharge device 1 is mounted on the coating device 200, the nozzle arrangement line 20 is arranged so as to align with the direction of the desired drawing line (straight line). As in the first embodiment, a rotation mechanism may be provided on the worktable 202 or the discharge device 1 to dynamically adjust the direction of the discharge port.

Furthermore, in the case of having a large ejection port and a small ejection port as in the present embodiment, each ejection port can be arranged in such a manner as to have a drawing line on a plane including the ejection direction of the liquid material ejected from the large ejection port, thereby making the nozzle arrangement line 20 consistent with the drawing direction of the drawing line.

The third to sixth discharge ports (83 to 86) of the same diameter and small circular shape function as auxiliary discharge ports for supplying auxiliary liquid material for smoothing the junction of the first and second discharge ports (81, 82).

FIG11 is an imaginary diagram of the situation in which six liquid blocks ejected simultaneously from the first to sixth ejection ports (81 to 86) land and spread on the coating object. As shown in the upper part of FIG11 , the six droplets (181 to 186) ejected simultaneously from the first to sixth ejection ports (81 to 86) are independent circular droplets when they land. As shown in the middle part of FIG11 , after a short period of time has passed since landing, the six droplets (181 to 186) spread out and begin to combine. Finally, as shown in the lower part of FIG11 , the six circles are completely combined, eliminating the unevenness of the coating width, and forming a straight, elongated coating pattern extending in the same direction as the nozzle configuration line 20.

As described above, the four auxiliary droplets 183 to 186 act to quickly eliminate the depression in the width direction generated when the basic droplets 181 to 182 are combined. In this embodiment, each discharge port is preferably circular, but is not limited to a circular shape.

Example of the fifth embodiment

In the fifth embodiment, the nozzle member 5 of the discharge device 1 has a different structure from the first to fourth embodiments, and the other structures are the same as the first to fourth embodiments. Hereinafter, the description of the structures common to the first to fourth embodiments will be omitted, and the different structures will be described.

As shown in Figure 12 (a), the nozzle member 5 of the fifth embodiment is composed of an upper member shown by symbol 5a and a lower member shown by symbol 5b. It has a flange portion 58 at the upper end and is supported on the mounting member 4 by the flange portion. The lower member 5b is screwed to the lower end of the upper member 5a or is fixed in a detachable manner by a fixing member such as a screw. The lower member 5b is detachably mounted on the upper member 5a, so it is easy to exchange multiple lower members 5b with different diameters and distances of the discharge port or different spray angles of the discharge port according to the purpose. It is preferred to provide a positioning mechanism for making the orientation of the lower member 5b constant relative to the upper member 5a when the lower member 5b is fixed to the upper member 5a. As the positioning mechanism, a well-known positioning mechanism can be used. For example, a structure in which a part of the lower member 5b or the upper member 5a (for example, a pin, a protrusion, a notch) is engaged with a member on the other side for positioning, or a structure in which a separately prepared member (for example, a pin or a screw) is used for positioning.

The first discharge port 91 communicates with the liquid chamber 41 via a linear first discharge channel 93 and a large-diameter discharge channel 95. Furthermore, the second discharge port 92 communicates with the liquid chamber 41 via a linear second discharge channel 94 and a large-diameter discharge channel 95. The first discharge channel 93 and the second discharge channel 94 have identical shapes and are inclined at equal angles relative to the central axis 59 of the nozzle member. The angle _A1 formed between the central axis of the first discharge channel 93 and the central axis 59 of the nozzle member and the angle A2 formed between the central axis of the second discharge channel ₉₄ and the central axis 59 of the nozzle member are equal, and are set, for example, to _A1 = _A2 < 45 degrees.

In this embodiment, the discharge direction of the liquid material is mainly considered to be the direction of the central axis 59 .

In the fifth embodiment, the distance h between the discharge port and the workpiece is adjusted by the Z drive 205, thereby adjusting the distance between the two simultaneously discharged liquid masses. Figure 12(b) illustrates the distance (overlapping state) between the droplets when the distance h between the discharge port and the workpiece is h _a and h _b . As can be seen from the figure, as the distance h between the discharge port and the workpiece decreases, the distance between the droplets increases, while as the distance h increases, the distance between the droplets decreases. However, in this embodiment, the distance h is set so that the multiple simultaneously discharged droplets do not touch or merge before landing.

According to the coating apparatus and coating method of the fifth embodiment described above, the distance h between the discharge port and the workpiece can be adjusted to adjust the distance between two landed droplets and the degree of overlap. This allows for appropriate response to differences in the distance between droplets and the degree of overlap caused by differences in the atmospheric environment, such as humidity or room temperature.

The number of discharge ports is not limited to the two shown in the example, and may be three or more. When the number of discharge ports is an odd number, the discharge port located at the center is not tilted, and the paired discharge ports located at the same distance from the center are tilted at equal angles relative to the central axis of the nozzle member.

Furthermore, when the distance h between the discharge port and the workpiece is set to be very small, the ejection angle of each discharge port may be set in a direction (radially) away from the central axis of the nozzle member to allow the droplets to coalesce on the workpiece.

Industrial applicability

The present invention can certainly be applied to industrial grease, solder paste, silver paste, various adhesives (UV curing, epoxy, hot melt, etc.), flux, and can also be applied to liquid materials such as low viscosity materials such as solvents (about 0.8 cps) and high viscosity materials (about 1,00,000 cps).

Explanation of symbols

1: Discharge device, 2: Upper body, 3: Lower body, 4: Mounting member, 5: Nozzle member, 6: Liquid supply member, 7: Liquid storage container, 8: Pneumatic dispenser, 9: Gas supply source, 10: Plunger, 11: Piston, 12: Sealing member, 13: Elastic member, 14: Stopper, 15: Micrometer, 16: Solenoid switching valve, 17: Switching valve control unit, 18: Pressure reducing valve (regulator), 19: Gas supply source, 20: Nozzle arrangement line, 21: Through hole, 22: Lower chamber, 23: Upper chamber, 24: Lower vent, 25: Upper vent, 31: Through hole, 32: Sealing member, 33: Supply path, 41: Liquid chamber, 42: Liquid supply path, 51: First discharge port, 52: Second discharge port, 53: Third discharge port, 61: Liquid supply path, 71: First discharge port, 72: Second discharge port, 73: Third discharge port, 74: Fourth discharge port, 81: First discharge port, 82: Second discharge port, 83: Third discharge port, 84: Fourth discharge port, 85: Fifth discharge port, 86: Sixth discharge port, 91: First discharge port, 92: Second discharge port, 101: Tip end portion of plunger, 102: Side surface of tip end portion of plunger, 103: Tip end surface of plunger, 200: Coating device, 201: Base, 202: Worktable, 203: X drive device, 204: Y drive device, 205: Z drive device, 206: Control device, 213: X direction, 214: Y direction, 215: Z direction, 207: Coating object (workpiece), 411: Inner wall of liquid chamber, 412: Bottom surface of liquid chamber.

Claims (26)

1. A coating method, characterized in that, It is a method of applying lines to a coating object using a coating device. The coating apparatus includes: Dispensing device; A workbench on which the object to be coated is placed; Drive mechanism that moves the dispensing device relative to the worktable; and The control unit controls the operation of the dispensing device and the drive unit. The dispensing device includes: A nozzle having multiple outlets for dispensing liquid material; A liquid chamber, which is in communication with all of the plurality of discharge outlets via a plurality of discharge paths; and The ejector component comes into contact with the liquid material in one of the liquid chambers. The liquid material in the liquid chamber is subjected to an inertial force by the ejection component, causing it to be ejected simultaneously from all of the plurality of ejection ports, forming multiple droplets on the object to be coated. The plurality of discharge outlets are arranged along a straight nozzle configuration line on the nozzle. With the nozzle configuration line aligned with the drawing direction of the drawing line, multiple liquid blocks ejected simultaneously do not contact each other before landing on the object to be coated, and the liquid material landing along the nozzle configuration line binds to the object to be coated, so that all liquid material is ejected from the multiple ejection ports and linear coating is performed. 2. The coating method as described in claim 1, characterized in that, The dispensing device includes: The plunger has a smaller diameter than the liquid chamber, and its front end moves forward and backward within the liquid chamber. A plunger reciprocating movement device that causes the plunger to move forward and backward; and A liquid delivery device that supplies liquid material into the liquid chamber. The plunger is moved into and stopped while its front end is not in contact with the inner wall of the liquid chamber, thereby imparting an inertial force to the liquid material, causing it to be ejected simultaneously from the plurality of ejection ports. 3. The coating method as described in claim 1 or 2, characterized in that, The control unit performs linear coating by moving the dispensing device and the worktable at a constant speed _Vc relative to each other in the same direction as the nozzle configuration line, while at least one of the dispensed liquid blocks combines with the liquid material on the previously dispensed coating object to form a drawing line. The timing of dispensing is set at a certain interval _Tc according to the relative movement speed of the dispensing device and the worktable. 4. The coating method as described in claim 1 or 2, characterized in that, By adjusting the propulsion force of the ejection member, liquid material is ejected in such a way that the ejected liquid blocks do not contact each other before landing on the object to be coated, and the liquid material that lands along the nozzle configuration line combines with the object to be coated. 5. The coating method as described in claim 1 or 2, characterized in that, The plurality of discharge flow paths are configured to have a straight first discharge flow path and a straight second discharge flow path. The extension lines of the first discharge flow path and the extension lines of the second discharge flow path are arranged at an angle in an intersecting manner. By adjusting the distance h between the outlet and the object to be coated, the distance between multiple droplets formed on the object to be coated can be adjusted within a range where multiple liquid blocks ejected from the first and second ejection paths do not contact each other before landing. 6. The coating method as described in claim 1 or 2, characterized in that, Each of the plurality of discharge outlets is configured on the nozzle configuration line. 7. The coating method as described in claim 1 or 2, characterized in that, The multiple discharge outlets are all of the same shape and are configured to be equally spaced. 8. The coating method as described in claim 1 or 2, characterized in that, The plurality of discharge ports consists of an even number of discharge ports, including two large discharge ports and two small discharge ports, each of which is configured on the nozzle configuration line. The small and large nozzles are alternately arranged along the nozzle configuration line. 9. The coating method as described in claim 1 or 2, characterized in that, The plurality of discharge outlets consists of an even number of discharge outlets, including two large discharge outlets and two groups of small discharge outlets, each of which is arranged on the nozzle configuration line. The small discharge port group and the large discharge port are arranged alternately along the nozzle configuration line. The small nozzle assembly consists of a plurality of small nozzles arranged symmetrically with respect to the nozzle configuration line. 10. The coating method as described in claim 1 or 2, characterized in that, The dispensing device or the worktable has a rotating mechanism. The rotation mechanism aligns the nozzle configuration line with the drawing direction of the drawing line. 11. The coating method as described in claim 10, characterized in that, The linear coating is performed according to a coating pattern comprising linear coating lines extending in a first direction and linear coating lines extending in a second direction different from the first direction. 12. The coating method as described in claim 1 or 2, characterized in that, The nozzle is detachably fixed relative to the dispensing device. The dispensing device has a positioning mechanism that enables the nozzle to be installed in a manner that is relative to the dispensing device in the direction of the nozzle configuration line. 13. The coating method as described in claim 1 or 2, characterized in that, Liquid material is simultaneously ejected from the multiple ejection ports in such a manner that all the ejected liquid blocks combine upon landing on the object to be coated. 14. A coating apparatus, characterized in that, It includes a dispensing device, a worktable for holding the object to be coated, a drive unit for moving the dispensing device relative to the worktable, and a control unit for controlling the operation of the dispensing device and the drive unit. The dispensing device includes: A nozzle having multiple outlets for dispensing liquid material; A liquid chamber, which is in communication with all of the plurality of discharge outlets via a plurality of discharge paths; and The ejector component comes into contact with the liquid material in one of the liquid chambers. The liquid material in the liquid chamber is imparted with an inertial force by the ejection member and ejected simultaneously from all of the plurality of ejection ports, forming multiple droplets on the object to be coated. The plurality of discharge outlets are arranged along a straight nozzle configuration line on the nozzle. The control unit performs linear coating by dispensing all liquid material from the multiple dispensing outlets in a manner in which multiple liquid blocks that are simultaneously ejected do not contact each other before landing on the object to be coated, and the liquid material that lands along the nozzle configuration line combines with the object to be coated. 15. The coating apparatus as claimed in claim 14, characterized in that, The dispensing device includes: The plunger has a smaller diameter than the liquid chamber, and its front end moves forward and backward within the liquid chamber. A plunger reciprocating movement device that causes the plunger to move forward and backward; and A liquid delivery device that supplies liquid material into the liquid chamber. The plunger is moved into and stopped while its front end is not in contact with the inner wall of the liquid chamber, thereby imparting an inertial force to the liquid material, causing it to be ejected simultaneously from the plurality of ejection ports. 16. The coating apparatus as claimed in claim 14 or 15, characterized in that, The control unit performs linear coating by moving the dispensing device and the worktable at a constant speed _Vc relative to each other in the same direction as the nozzle configuration line, while at least one of the dispensed liquid blocks combines with the liquid material on the previously dispensed coating object to form a drawing line. The timing of dispensing is set at a certain interval _Tc according to the relative movement speed of the dispensing device and the worktable. 17. The coating apparatus as claimed in claim 14 or 15, characterized in that, The control unit adjusts the propulsion force of the ejection member to eject liquid material in such a way that the ejected liquid blocks do not contact each other before landing on the object to be coated, and the liquid material that lands along the nozzle configuration line combines with the object to be coated. 18. The coating apparatus as claimed in claim 14 or 15, characterized in that, The plurality of discharge flow paths are configured to have a straight first discharge flow path and a straight second discharge flow path. The extension lines of the first discharge flow path and the extension lines of the second discharge flow path are arranged at an angle in an intersecting manner. By adjusting the distance h between the discharge port and the object to be coated, the distance between multiple droplets formed on the object to be coated can be adjusted within a range where multiple liquid blocks discharged from the first discharge flow path and the second discharge flow path do not contact each other before landing. 19. The coating apparatus as claimed in claim 14 or 15, characterized in that, Each of the plurality of discharge outlets is configured on the nozzle configuration line. 20. The coating apparatus as claimed in claim 14 or 15, characterized in that, The multiple discharge outlets are all of the same shape and are configured to be equally spaced. 21. The coating apparatus as claimed in claim 14 or 15, characterized in that, The plurality of discharge ports consists of an even number of discharge ports, including two large discharge ports and two small discharge ports, each of which is configured on the nozzle configuration line. The small and large nozzles are alternately arranged along the nozzle configuration line. 22. The coating apparatus as claimed in claim 14 or 15, characterized in that, The plurality of discharge outlets consists of an even number of discharge outlets, including two large discharge outlets and two groups of small discharge outlets, each of which is arranged on the nozzle configuration line. The small discharge port group and the large discharge port are arranged alternately along the nozzle configuration line. The small nozzle assembly consists of a plurality of small nozzles arranged symmetrically with respect to the nozzle configuration line. 23. The coating apparatus as described in claim 14 or 15, characterized in that, The dispensing device or the worktable has a rotating mechanism. The control unit uses the rotating mechanism to align the nozzle configuration line with the drawing direction of the drawing line. 24. The coating apparatus as claimed in claim 14 or 15, characterized in that, The drive device includes a single-axis drive mechanism that enables the ejection device and the worktable to move linearly relative to each other. The nozzle configuration line is configured in accordance with the driving direction of the single-axis drive mechanism. 25. The coating apparatus as claimed in claim 14 or 15, characterized in that, The nozzle is detachably fixed relative to the dispensing device. The dispensing device has a positioning mechanism that enables the nozzle to be installed in a manner that is relative to the dispensing device in the direction of the nozzle configuration line. 26. The coating apparatus as described in claim 14 or 15, characterized in that, The control unit simultaneously ejects liquid material from the multiple ejection ports in such a manner that all the liquid blocks ejected at the same time combine upon landing on the object to be coated.