JP2001300389A - Viscous material coating method and coater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a viscous material coating method and a viscous material coater by which a viscous material is coated stably by always preventing the contact of the viscous material with air, the swelling out of the viscous material in the operation does not occur and the discharge pressure is controlled with high precision and high responsiveness, the viscosity is adjusted and the coating with high quality is attained. SOLUTION: In the viscous material coating method and the viscous material coater for applying the viscous material on a material to be coated by using a coating unit 3 having a storage chamber 3a for the viscous material 4 and provided with a discharge port for the viscous material 4 to be communicated with the storage chamber 3a and allowing the discharge port 8 of the coating unit 3 to contact with the screen mask 53 to relatively move, the viscous material 4 in the storage chamber 3a is stirred by repeating the relative movement in the horizontal direction, the vertical direction or both direction to the screen mask 53 in a state that the coating unit 3 is brought into contact with the screen mask 53.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of applying a viscous material such as an adhesive, a cream solder, or a conductive paste on a workpiece such as a circuit board through a screen mask or directly in a predetermined pattern. It concerns the device.

[0002]

2. Description of the Related Art FIG.
As shown in (a) to (e), a screen printing apparatus that applies a viscous material 4 such as an adhesive or cream solder onto a land 51 such as a circuit board which is an object to be coated 50 via a screen mask 53 is generally used. Is known.

The screen mask 53 has an opening 52 composed of through holes arranged in a predetermined pattern corresponding to the land 51 of the coating object 50. As shown in FIGS. The coating object 50 is positioned and brought into contact with 53 by a table unit (not shown). Next, as shown in FIG.
The viscous material 4 supplied to one end of the material is moved in a predetermined direction by a squeegee 54 so that the viscous material 4
Fill. Next, as shown in FIG.
Is separated from the screen mask 53 to transfer the viscous material 4 in the opening 52 onto the land 51 of the object 50 as shown in FIG. Coated.

The present inventor has disclosed in Japanese Patent Application No. 10-23216.
In No. 4, a filling unit movable on a screen mask has a hermetically sealed structure for shielding the printing paste from the atmosphere, a discharge port is formed facing the screen mask, and a chamber filled with the printing paste; A pressurizing means for pressurizing the printing paste and extruding it from the discharge port, and a pair of scraping blades slid by being pressed against the screen mask at front and rear positions in the filling unit moving direction, and forming part of the pressurizing means. Discloses a hermetically sealed squeegee provided with a paste tank that can be detachably mounted and a shutter mechanism that can be opened and closed at a discharge port.

[0005]

However, in the above-mentioned conventional viscous material coating apparatus, since the squeegee 54 is moved on the screen mask 53 to fill the opening 52 with the viscous material 4, the viscous material 4 is also used. Since it is always in contact with air, there is a problem that the state of the viscous material 4 is liable to change, and there is a possibility that stable application may not be performed. In addition, the viscous material 4 protruding from the squeegee 54 is not scraped into the squeegee 54. The problem is that it is difficult to control the viscosity of the viscous material, and there is a problem that it is difficult to control the viscosity of the coating material. There was a problem of needing know-how.

On the other hand, according to the technical means disclosed in Japanese Patent Application No. 10-232164, it is not necessary to scrape the viscous material, and it is possible to suppress the viscous material 4 from changing its state without coming into contact with air. There is no means for stirring the viscous material supplied into the chamber, and there is a problem that the coating quality may be unstable. For example, at the production site, immediately after the initial supply of the viscous material to the chamber at the start of production or immediately after the production starts after the equipment has been shut down for a long time due to equipment trouble, the fluidity of the viscous material in the chamber decreases. As a result, sufficient coating cannot be performed, and quality defects such as so-called "sprinkling" may occur.

SUMMARY OF THE INVENTION In view of the above problems, the present invention can prevent a viscous material from being constantly in contact with air so that the viscous material can be stably applied. It is an object of the present invention to provide a method and an apparatus for applying a viscous material which can control viscosity with high accuracy and responsiveness, can adjust viscosity, can control discharge pressure according to viscosity, and can realize high quality coating. I have.

[0008]

A viscous material applying method according to the present invention has a viscous material storage chamber, a viscous material discharge port is provided in communication with the storage chamber, and the viscous material is supplied to the storage chamber. Using a coating unit to which a viscous material supply means is connected and provided with a discharge pressure adjusting means for applying a discharge pressure to the viscous material in the storage chamber, coating is performed with a screen mask having an opening corresponding to the object to be coated or the object itself. A viscous material coating for applying a viscous material to a material to be coated by moving the coating unit and a screen mask or a coating unit and the material to be coated relatively while applying a discharge pressure to the viscous material in the storage chamber by contacting the discharge port of the unit. The method, wherein the coating unit is brought into contact with the screen mask or the object to be coated or the another object on a portion of the screen mask having no opening, or on the object to be coated, or on a separate object from the object to be coated. In this state, the viscous material in the storage chamber is agitated by repeating the operation of moving the screen mask or the object to be coated or the another object relative to the object in the parallel direction and / or the vertical direction, or both, and a special portion is provided at the discharge port. The viscous material can be effectively agitated and its viscosity adjusted without disturbing the high precision control of the discharge pressure and the responsiveness without disposing a stirrer. Can be obtained.

When the viscous material is agitated, the screen mask or the object to be coated or the another object is supported from the surface opposite to the surface with which the application unit comes into contact. Deflection can be prevented even when pressed against a coating material or another object.

Further, the space in the storage room is repeatedly increased and decreased,
Even when the viscous material in the storage chamber is agitated, the viscous material can be similarly effectively agitated and the viscosity thereof can be adjusted, so that good coating quality can be stably obtained.

[0011] Further, in a state where the coating unit is in contact with the screen mask or the object to be coated or the another object, the portion of the screen mask having no opening, or on the object to be coated or on the another object, The operation of relatively moving the application object or the separate object in the parallel direction or the vertical direction or both, and the operation of increasing or decreasing the space in the storage chamber are repeated in combination to stir the viscous material in the storage chamber. By using together, the viscosity can be adjusted by stirring the viscous material more effectively, and a good coating quality can be stably obtained.

Further, when the viscosity of the viscous material is measured, the stirring of the viscous material is stopped when the viscosity reaches a predetermined value, and the viscous material is applied to the object to be coated. And good coating quality can be obtained.

When the viscosity of the viscous material is measured and the discharge pressure of the viscous material is adjusted according to the detected viscosity, or when the application is stopped, an appropriate discharge pressure can be applied according to the viscosity of the viscous material. A high coating quality can be obtained.

In a state where the discharge port of the coating unit is in contact with the screen mask or the object to be coated or the another object, the coating unit is relatively moved along the screen mask or the object to be coated or the another object to form a storage chamber. Detecting the differential pressure of the viscous material on both sides in the moving direction, or detecting the moving load at the time of moving, or detecting the current flowing through the motor that drives the moving to measure the viscosity of the viscous material, it is housed in the storage chamber. The viscosity of the viscous material can be easily and accurately detected.

In addition, the viscosity adjustment time, the discharge pressure, and the like depend on the quality of the viscous material and the characteristics of the screen mask or the object to be coated.
A data table that defines the number of coating operations to change the number of viscosity adjustment operations, etc. is stored in the control unit, and if the viscosity of the viscous material and the control of the discharge pressure are controlled with reference to the data table, the viscosity can be detected. Without this, good coating quality can be obtained as described above.

Further, the viscous material coating apparatus of the present invention comprises a storage chamber for the viscous material, a discharge port for the viscous material provided in communication with the storage chamber, and a discharge pressure for applying a discharge pressure to the viscous material in the storage chamber. An adjusting unit is provided, comprising a coating unit connected to a viscous material supply unit that supplies a viscous material to the storage chamber,
The coating unit and the screen mask or the coating unit and the object to be coated are brought into contact with each other while applying a discharge pressure to the viscous material in the storage chamber by contacting the screen mask or the object to be coated with the opening corresponding to the object and the discharge port of the coating unit. A viscous material coating apparatus for applying a viscous material to an object to be coated, wherein the coating unit is provided at a location where there is no opening of a screen mask, or on an object to be coated, or on an object different from the object to be coated. Repeatedly moving the screen mask or the object to be coated or the different object relative to the screen mask in the parallel direction or the vertical direction or both, or repeating the expansion and contraction of the volume of the storage chamber or repeating them A means for adjusting the viscosity of the viscous material in the storage chamber by repeating the combination is provided. As described above, the discharge pressure is controlled with high precision. Without adversely affecting the response,
The viscosity can be adjusted by effectively stirring the viscous material, and good coating quality can be stably obtained.

Further, when a means for detecting the viscosity of the viscous material in the storage chamber is provided and the viscosity adjusting means is controlled based on the detected viscosity, it is possible to apply the composition in an optimum viscosity state as described above. A high coating quality can be obtained.

Further, if means for detecting the viscosity of the viscous material in the storage chamber is provided and the discharge pressure of the viscous material is adjusted in accordance with the detected viscosity, as described above, an appropriate value can be obtained in accordance with the viscosity of the viscous material. Discharge pressure can be applied, and good coating quality can be obtained.

Further, the viscosity detecting means includes pressure detecting means disposed on both sides in the moving direction of the coating unit in the storage chamber, and is configured to detect the viscosity by their differential pressure. It is provided with a means for detecting a moving load when relatively moving in contact with the application object or the another object, and is configured to detect the viscosity according to the magnitude of the load, or the application unit is a screen mask or an object to be applied or the application unit. It can be configured to include means for detecting a current flowing through the drive motor when moving by contacting another object, and to detect the viscosity by the magnitude of the current value,
In any case, the viscosity of the viscous material in the storage chamber can be appropriately detected with a simple configuration.

The viscosity adjusting time, the discharge pressure, and the like vary depending on the quality of the viscous material and the characteristics of the screen mask or the object to be coated.
If a data table defining the number of times of application and the like for changing the number of times of viscosity adjustment operation is stored in the control unit, control of viscosity adjustment and discharge pressure adjustment of the viscous material is performed with reference to this data table as described above. Thus, good coating quality can be obtained in the same manner as described above without detecting the viscosity.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a viscous material coating apparatus according to an embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, which shows the overall schematic structure of the viscous material coating apparatus, a coating object 50 is transferred into the apparatus by a transfer section 55a, and is positioned and fixed to a table section 56 disposed below the screen mask 53. . The table section 56 has an up-and-down mechanism (not shown) for bringing the article 50 into contact with the screen mask 53. Further, an X, Y, θ positioning mechanism (not shown) for adjusting the relative positions of the object 50 and the screen mask 53 in the X, Y, θ directions is provided in either the table section 56 or the screen mask 53. ing.

A coating head 57 is disposed above the screen mask 53. After the object 50 is brought into contact with the screen mask 53, the coating head 57 is pressed against the screen mask 53, and a horizontal drive is performed in this state. The viscous material is applied to the object 50 by being moved by the means 58. After the application is completed, the object 50 is transported to a subsequent process by the transport unit 55b. Each of the above-mentioned mechanism units is totally controlled by the control unit 59.

As shown in FIG. 2, the coating head 57 mainly includes a material supply unit 1, an air supply unit 2, and a coating unit 3. The material supply unit 1 includes a syringe-like storage tank 1b containing a viscous material 4 such as an adhesive or cream solder, and the plunger 1a is supplied by compressed air for material supply.
Is actuated to pressurize the viscous material 4, and the pressure is fed so that the viscous material 4 fills the chamber 3 a which is the storage room of the viscous material 4 in the coating unit 3.

The chamber 3a of the coating unit 3 and the material supply section 1 are connected by a joint 5, and pass through a supply passage 5a provided in the joint 5 to allow the viscous material 4 to pass through.
Is supplied into the chamber 3a.

On both lower sides of the chamber 3a, two blades 6 made of an elastic thin plate are attached by a blade retainer 7 so as to approach each other downward and to have an interval of about 10 mm between their tips. A discharge port 8 for discharging the viscous material 4 is formed by an opening between the two blades 6. The blade 6 is, for example, 0.1 to
It is composed of a thin plate of about 0.5 mm such as copper, stainless steel, or resin, but a resin material such as polyimide or polyamide-imide is particularly preferable.

Stoppers 9 are provided at both ends of the two blades 6 to prevent the viscous material 4 from leaking from the chamber 3a, and to prevent the stopper 9 from coming off by the pressure applied to the viscous material 4. Is held down by

On the opposite side of the discharge port 8 of the chamber 3a, that is, on the upper part of the chamber 3a, a bag 10 made of a sheet having a recess is provided so as to face the discharge port 8 so as to partially face the chamber 3a. Is disposed over substantially the entire length along the longitudinal direction of the chamber 3a, and is sandwiched and fixed between the chamber 3a and a plate 3b closing the upper part thereof. The internal volume of the bag 10 is configured to be increased or decreased by supplying and discharging air from the air supply unit 2 via the air port 2a. The bag 10 is made of a resin material such as urethane elastomer or polyethylene or nylon having a thickness of about 0.03 to 1 mm, and more preferably about 0.3 to 0.5 mm. here,
The thickness of the bag 10 depends on the pressure of the supplied air, but if it is too thin, it may be broken, and if it is too thick, the response to expansion and contraction may be poor.

After supplying the viscous material into the chamber 3a,
When air is supplied to the bag 10, the viscous material 4 can be pressed at a predetermined pressure, and a discharge pressure at the time of applying the viscous material 4 can be applied. When the air is discharged from the bag 10, the discharge pressure is instantaneously increased. Can be canceled.

An air bleed sheet 11 for bleeding air is disposed on the lower surface of the bag 10 at a portion of the bag 10 which is fixed by being sandwiched between the chamber 3a and the plate 3b. When the viscous material 4 is first supplied to the inside, the air in the chamber 3 a is released from the air release sheet 11.

A bag 10 is not provided at the center of the chamber 3a, and a pressure detecting means 12 for detecting the pressure of the viscous material 4 in the chamber 3a is provided in this portion.

Next, a method of causing the viscous material 4 in the chamber 3a of the coating unit 3 having the above structure to flow and stir in the chamber 3a will be described with reference to FIGS.

In FIG. 3, the coating unit 3 is supported by a guide 14 via a bracket 13 so as to be movable in a vertical direction in a perspective direction with respect to a screen mask 53, and is vertically moved by a feed screw mechanism 15 and a motor 16. It is configured so that it can be positioned at any position in the direction. Here, let Z be the height of the coating unit 3 when the discharge port 8 is in contact with the screen mask 53. Screen mask 53
The table unit 56 movably disposed below the object 50 holds the object 50 to apply the viscous material 4 to the object 50 and abuts the screen mask 53. Is discharged to a post-process.

When the chamber 3a is empty, the viscous material 4
When the coating operation is stopped for a certain period of time, such as at the time of initial supply of supplying the gas into the chamber 3a, or even when the coating operation is being performed, a trouble of the equipment occurs, or when the supply of the coating object 50 is awaited. In many cases, the viscosity of the viscous material 4 is in a state where it is difficult to flow, so that the viscous material 4 in the chamber 3a is made to easily flow before performing the coating, and the coating state is stably improved. It is preferred that this be done.

In a state where the table portion 56 is in contact with the screen mask 53 to support the screen mask 53, as shown in FIG. 53, and the height of the coating unit 3 is changed to Z-α.
Then, the bag 10 is inflated to apply pressure to the viscous material 4, and the coating unit 3 is reciprocated by a horizontal driving unit 58 (see FIG. 1) at a location where the screen mask 53 has no opening as indicated by an arrow. Thereby, as shown in FIGS. 4B and 4C, the viscous material 4 in the chamber 3a moves so as to roll in the chamber 3a, and the viscosity of the viscous material 4 can be adjusted.

The reciprocating operation conditions depend on the type of the viscous material 4. For example, the pressure of the air supply unit 2 is 0.3 MPa, the pushing amount α to the screen mask 53 is 1 mm, the reciprocating operation speed is 50 mm / s, and the reciprocating operation is performed. Operation stroke is 20mm,
The number of reciprocations is 10 times.

Since the viscous material 4 hardly flows at the beginning of the reciprocating operation, the pressure of the air supply unit 2 is lowered or the reciprocating operation speed is set low, and the pressure of the air supply unit 2 is increased in the latter half of the reciprocating operation. In some cases, the reciprocating operation speed may be increased. All of these can be automatically performed based on the reciprocating operation setting data input to the control unit 59 in advance.
Alternatively, as described later, the operation may be stopped when the viscosity of the viscous material 4 in the chamber 3a is detected and reaches a predetermined viscosity.

Further, the viscous material 4 in the chamber 3a is forced to flow also on the side and the upper part of the chamber 3a.
As shown in FIGS. 5A and 5B, with the bag 10 in a contractible state, the height (Z) of the coating unit 3 in contact with the screen mask 53 and the screen mask 5
The viscous material 4 in the chamber 3a may be caused to flow by using the bending of the blade 6 by repeating the vertical movement between the position (Z-β) and the position where the blade 3 is pushed toward (3). If this part does not easily flow during application, the pressure in the chamber 3a may increase more than expected, so it is preferable to previously flow and stir the viscous material 4 by this method.

As shown in FIGS. 6A and 6B,
Similar effects can be obtained by moving the viscous material 4 in the chamber 3a by repeatedly supplying and discharging air to and from the bag 10.

As shown in FIG. 7, instead of the bag 10, an egress / retreat member 17 which can enter and exit the chamber 3a is provided, and is driven by a push / pull means 18 such as a cylinder. Also, in the application unit 3 configured to apply the viscous material 4 from the discharge port 8 by pressing the viscous material 4 with the retreat member 17, as shown in FIGS. 7A and 7B, The same effect can be obtained even if the viscous material 4 in the chamber 3a is moved by repeating the movement of the movement member 17.

As shown in FIG. 8, a container 19 containing the viscous material 4 in the upper portion of the chamber 3a and communicating with the inside of the chamber 3a through the through hole 19a is provided. FIG. 8 (a) also shows the coating unit 3 in which the plunger 20 disposed on the upper side is pressed by the push / pull means 18 such as a cylinder to supply the viscous material 4 into the chamber 3a and to apply the discharge pressure. , (B)
As shown in (1), the same effect can be obtained even if the viscous material 4 in the chamber 3a is moved by repeatedly pushing and pulling the plunger 20.

Next, a method of applying a viscous material according to another embodiment of the present invention will be described with reference to FIGS.

FIG. 9 shows the relationship between the number of coating operations, the change in the viscosity 21 of the viscous material 4 and the pressure 22 of the air supply unit 2 during the coating operation in this embodiment. At the beginning of the application, the application is performed at the pressure P1 of the air supply unit 2, and the viscosity of the viscous material 4 at that time is η1. When the application is repeated, the viscosity gradually decreases, and the application can be sufficiently performed even at a low pressure.
And continue application. Thereby, the bleeding of the viscous material 4 which is likely to occur at the time of low viscosity can be prevented, and stable high-quality coating can be performed. Thus, the viscous material 4
The change timing of the discharge pressure and the respective discharge pressures are stored in the control unit 59 as a data table in accordance with the quality of the viscous material 4, the characteristics of the screen mask 53, and the like. High quality coating is possible.

In the coating method for setting the pressure of the air supply unit 2 according to the viscosity of the viscous material 4 as described above, the change timing may be set in advance by the number of times of application as described above. When the viscous material 4 in the chamber 3a is being moved and agitated while the liquid 4 is being applied, the viscosity of the viscous material 4 may be measured and the pressure of the air supply unit 2 may be changed each time.

Hereinafter, each method of measuring the viscosity of the viscous material 4 in the chamber 3a will be described with reference to FIGS.

FIG. 10 (a) shows pressure detectors 12a and 12b composed of a plurality of pressure sensors provided in both sides in the moving direction of the coating unit 3 in the chamber 3a to detect a pressure difference when the coating unit 3 moves. Is what you do. For example, when the chamber 3a is moved to the right, the viscous material 4
The pressure detecting means 12a and 12
The pressures detected at b are P3 and P4, respectively, as shown in FIG. From the pressure difference ΔP between the pressures P3 and P4, the ease with which the viscous material 4 flows can be determined. The pressure difference ΔP is small when the viscosity of the viscous material 4 is low and easy to flow, and the pressure difference ΔP when the viscosity is large and difficult to flow.
Since P becomes large, at least two pressure detecting means 1
By providing 2a and 12b, the viscosity of the viscous material 4 can be determined. Note that when the air pressure from the air supply unit 2 changes, the measured pressures P3 and P4 change, but the pressure difference ΔP can be seen as corresponding to the ease with which the viscous material 4 flows. Since it hardly changes regardless of the pressure of the air supply unit 2, it is effective as a method for indirectly measuring the viscosity.

FIG. 11A shows a coating head 57. The coating unit 3 is pressed against the support member 23 by a pressing means such as a spring 25 via a load cell 24 with a constant load and attached. I have. The coating head 57 can be moved on the screen mask 53 by the horizontal driving means 58, and the load cell 24 detects the movement resistance received when the coating unit 3 moves on the screen mask 53. The load due to the movement resistance changes depending on the viscosity of the viscous material 4 of the discharge port 8 in contact with the screen mask 53, and the state of the change is shown in FIG.
This is shown in FIG.

The coating unit 3 is mounted on the supporting member 2 with a constant load g.
3, when the pressure is applied to the viscous material 4 and the application unit 3 is moved horizontally along the screen mask 53, the load becomes g1. At first, the viscosity of the viscous material 4 is high, so that the viscous material 4 in the chamber 3a does not easily flow. However, as the horizontal movement is repeated, the viscosity of the viscous material 4 decreases and the load becomes smaller. For example, if the load becomes g2 or less in advance, it can be set so that the viscosity of the viscous material 4 is stabilized and the application is started.
It is also possible to accumulate how much the initial load g1 has changed as data, and determine from the amount of change in the load that the viscosity of the viscous material 4 has stabilized.

FIG. 12A shows a horizontal driving means 58, which is configured to drive the coating head 57 along the screen mask 53 by the feed screw mechanism 26, the guide 27 and the motor 28. Driver 29 for motor 28
Is configured to detect a load when the coating unit 3 moves on the screen mask 53 from the current values of the above.

That is, when the coating unit 3 is horizontally moved along the screen mask 53 while applying pressure to the viscous material 4, as shown in FIG.
Becomes h1. At first, the viscosity of the viscous material 4 is high, so that the viscous material 4 in the chamber 3a does not easily flow. However, as the horizontal movement is repeated, the viscosity of the viscous material 4 decreases and the load becomes smaller. Less. Therefore, for example, if the current value becomes h2 or less in advance, it can be set so that the viscosity of the viscous material 4 is stabilized and the application is started. Further, how much the current value h1 has changed initially is stored as data. However, it can be determined that the viscosity of the viscous material 4 is stabilized based on the amount of change in the current value.

In the description of this embodiment, an example in which the bag 10 is used as the discharge pressure adjusting means of the coating unit 3 has been described. However, as shown in FIGS. In the case where the plunger 20 is moved back and forth or the case where the plunger 20 is pushed and pulled by providing the container 19 communicating with the upper part of the chamber 3a through the through hole 19a, the application condition is similarly determined by the viscosity of the viscous material 4. Can be changed.

Further, as shown in FIG. 9, the method of changing the pressure of the air supply unit 2 according to the number of times of application according to the change in the viscosity of the viscous material 4 has been described. Although it is indirect, it is actually measured, and the condition change timing experimentally obtained is obtained by referring to a data table stored in the control unit 59, whereby the application condition is determined in accordance with the actual application state. It is also possible to apply the viscous material 4 to the object 50 more stably, which is preferable.

In FIGS. 9 to 12, the description has been given of changing the discharge pressure of the viscous material 4 in response to the change in the viscosity of the viscous material 4 due to application. The same can be used for stabilizing the viscosity of the viscous material 4 before application. For example, instead of counting the number of reciprocations and terminating the operation, detecting the change in the viscosity of the viscous material 4 and ending the operation, Even if there is a difference in the surrounding environment or a difference in the characteristics of the viscous material 4 depending on the lot, the same state can always be reproduced.

In the above embodiment, only an example in which the coating unit 3 is moved without moving the screen mask 53 has been described. Conversely, the screen mask 53 or the coating target is not moved without moving the coating unit 3. Even when the object 50 is configured to move, the same effect can be obtained and the effect can be obtained.

In the above embodiment, FIG.
As shown in FIG. 3, the object 50 is placed on the lower surface of the screen mask 53, and the viscous material 4
Through the opening 52 of the screen mask 53
Although the example of applying and printing on the land 51 of No. 0 is shown, in the present invention, as shown in FIG. 13B, the viscous material 4 is filled in a concave portion or a through hole formed in the object 50 to be coated. The present invention can also be applied to the case of coating, and in this case, the same effect can be obtained.

[0056]

According to the method and the apparatus for applying a viscous material of the present invention, as is apparent from the above description, the portion of the screen mask where there is no opening, or on the object to be coated or an object different from the object to be coated. On the above, while the coating unit is in contact with the screen mask or the object to be coated or the different object, the operation of moving the screen unit relative to the screen mask or the object to be coated or the different object in the parallel direction or the vertical direction or both is repeated. , Which stirs viscous material in the storage chamber, without disposing special stirring means at the discharge port, effectively controlling viscous material without adversely affecting high-precision control of discharge pressure and responsiveness. To adjust the viscosity.
Good coating quality can be stably obtained.

Further, the space in the storage room is repeatedly increased and decreased,
Even when the viscous material in the storage chamber is agitated, the viscous material can be effectively agitated and the viscosity thereof can be adjusted similarly, so that good coating quality can be stably obtained.

When both of the above methods are used in combination, the viscosity can be adjusted by stirring the viscous material more effectively, and good coating quality can be stably obtained.

When the viscosity of the viscous material is measured, and when the viscosity reaches a predetermined value, the stirring of the viscous material is stopped and the viscous material is applied to the object to be applied. And good coating quality can be obtained.

When the viscosity of the viscous material is measured and the discharge pressure of the viscous material is adjusted according to the detected viscosity, or when the application is stopped, an appropriate discharge pressure can be applied according to the viscosity of the viscous material. A high coating quality can be obtained.

In a state in which the discharge port of the coating unit is in contact with the screen mask or the object to be coated or the another object, the coating unit is relatively moved along the screen mask or the object to be coated or the another object to form a storage chamber. Detecting the differential pressure of the viscous material on both sides of the moving direction, or detecting the moving load at the time of movement, or detecting the current flowing through the motor driving the movement to measure the viscosity of the viscous material,
The viscosity of the viscous material contained in the storage chamber can be easily and accurately detected.

A data table defining viscosity adjustment conditions such as viscosity adjustment time, viscosity adjustment operation number, discharge pressure, etc., or application conditions in accordance with the quality of the viscous material, the coating pattern, the characteristics of the object to be coated, and the like is provided to the control unit. By storing the data and controlling the viscosity adjustment and the discharge pressure adjustment of the viscous material with reference to the data table, it is possible to obtain the same good coating quality as described above without detecting the viscosity.

[Brief description of the drawings]

FIG. 1 is a front view showing an overall schematic configuration of an embodiment of a viscous material application device of the present invention.

FIG. 2 shows a configuration of a coating head in the embodiment,
(A) is a longitudinal front view, (b) is a longitudinal side view.

FIG. 3 is a partial cross-sectional side view showing a schematic configuration of a coating head unit in the embodiment.

FIG. 4 is an explanatory diagram of a first viscous material stirring method in the embodiment.

FIG. 5 is an explanatory diagram of a second method of stirring a viscous material in the embodiment.

FIG. 6 is an explanatory diagram of a third method of stirring a viscous material in the embodiment.

FIG. 7 is an explanatory diagram of a modified example of the third viscous material stirring method in the embodiment.

FIG. 8 is an explanatory diagram of another modified example of the third viscous material stirring method in the embodiment.

FIG. 9 is an explanatory view of a method of changing the discharge pressure by changing the viscosity of the viscous material in another embodiment of the viscous material application device of the present invention.

FIG. 10 is an explanatory diagram of a first method for measuring the viscosity of the viscous material in the embodiment.

FIG. 11 is an explanatory diagram of a second method for measuring the viscosity of the viscous material in the embodiment.

FIG. 12 is an explanatory diagram of a third method for measuring the viscosity of the viscous material in the embodiment.

FIG. 13 is an explanatory diagram of another application example of the embodiment.

FIG. 14 is an explanatory diagram of a conventional screen printing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Material supply part (viscous material supply means) 2 Air supply part (discharge pressure adjustment means) 3 Coating unit 3a Chamber (reservoir) 4 Viscous material 8 Discharge port 10 Bag (discharge pressure adjustment means) 12a, 12b Pressure detection means 15 Feed screw mechanism 16 Motor 17 Retractable member 20 Plunger 24 Load cell 26 Feed screw mechanism 28 Motor 29 Driver 50 Coating object 53 Screen mask 58 Horizontal drive means 59 Control unit

Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court II (Reference) B41F 15/40 B41F 15/40 A (72) Inventor Toshiaki Yamauchi 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Muneyoshi Fujiwara 1006 Kazuma Kadoma, Kazuma, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. (reference) 4F041 AA05 AB01 BA05 BA12 BA34 BA43 BA56 4F042 AA07 BA07 BA08 BA15 CA06 CB03 CB07 CB27

Claims (15)

[Claims] A viscous material storage chamber, a viscous material discharge port is provided in communication with the viscous material, a viscous material supply means for supplying the viscous material to the viscous material is connected to the viscous material, Using a coating unit provided with a discharge pressure adjusting means for applying a discharge pressure to the discharge port of the coating unit and a screen mask having an opening corresponding to the coating object or the coating object itself, and the viscosity of the storage chamber. A viscous material application method of applying a viscous material to an object by relatively moving an application unit and a screen mask or an application unit and an object to be applied while applying a discharge pressure to the material, wherein the screen mask has no opening. , Or on the object to be coated, or on a different object from the object to be coated, the screen mask or the object to be coated or in the state where the coating unit is in contact with the screen mask or the object to be coated or the different object. A viscous material applying method characterized by repeating an operation of moving the viscous material relative to a separate object in a parallel direction and / or a vertical direction, and stirring the viscous material in the storage chamber. 2. The viscous material coating according to claim 1, wherein, when the viscous material is stirred, the screen mask, the object to be coated, or the another object is supported from a surface opposite to a surface on which the coating unit contacts. Method. 3. A storage chamber for the viscous material, a discharge port for the viscous material communicating with the storage chamber, a viscous material supply means for supplying the viscous material to the storage chamber, and a viscous material in the storage chamber. Using a coating unit provided with a discharge pressure adjusting means for applying a discharge pressure to the discharge port of the coating unit and a screen mask having an opening corresponding to the coating object or the coating object itself, and the viscosity of the storage chamber. A viscous material application method for applying a viscous material to an object by relatively moving the application unit and a screen mask or the application unit and the object to be applied while applying a discharge pressure to the material, and repeatedly increasing and decreasing the space in the storage chamber. And a method of applying a viscous material, wherein the viscous material in the storage chamber is agitated. 4. A viscous material storage chamber is provided, a viscous material discharge port is provided in communication with the storage chamber, and a viscous material supply means for supplying the viscous material to the storage chamber is connected. Using a coating unit provided with a discharge pressure adjusting means for applying a discharge pressure to the discharge port of the coating unit and a screen mask having an opening corresponding to the coating object or the coating object itself, and the viscosity of the storage chamber. A viscous material application method of applying a viscous material to an object by relatively moving an application unit and a screen mask or an application unit and an object to be applied while applying a discharge pressure to the material, wherein the screen mask has no opening. , Or on the object to be coated, or on a different object from the object to be coated, the screen mask or the object to be coated or in the state where the coating unit is in contact with the screen mask or the object to be coated or the different object. A viscous material characterized by repeating an operation of moving relative to the separate object in a parallel direction and / or a vertical direction or both, and an operation of increasing / decreasing the space in the storage chamber in combination, and stirring the viscous material in the storage chamber. Coating method. 5. The viscous material according to claim 1, wherein the viscosity of the viscous material is measured, and when the viscous material reaches a predetermined viscosity, the stirring of the viscous material is stopped, and the viscous material is applied to an object to be coated. The method for applying a viscous material according to any one of the above. 6. A storage chamber for a viscous material, a discharge port for the viscous material communicating with the storage chamber, a viscous material supply unit for supplying the viscous material to the storage chamber, and a viscous material in the storage chamber. Using a coating unit provided with a discharge pressure adjusting means for applying a discharge pressure to the discharge port of the coating unit and a screen mask having an opening corresponding to the coating object or the coating object itself, and the viscosity of the storage chamber. A coating material and a screen mask or a coating unit and a coated object are relatively moved while applying a discharge pressure to the material, and a viscous material coating method of coating the coated material with a viscous material. Adjust the discharge pressure of the viscous material according to the detected viscosity,
Alternatively, a method of applying a viscous material, wherein the application is stopped. 7. The storage unit is moved relatively along the screen mask or the object to be coated or the another object while the discharge port of the application unit is in contact with the screen mask or the object or the another object. Detecting the differential pressure of the viscous material on both sides of the moving direction, detecting the moving load at the time of moving, or detecting the current flowing to the motor driving the moving to measure the viscosity of the viscous material. Item 7. The method for applying a viscous material according to Item 5 or 6. 8. A viscous material storage chamber, a viscous material discharge port is provided in communication with the storage chamber, and a viscous material supply means for supplying the viscous material to the storage chamber is connected. Using a coating unit provided with a discharge pressure adjusting means for applying a discharge pressure to the discharge port of the coating unit and a screen mask having an opening corresponding to the coating object or the coating object itself, and the viscosity of the storage chamber. This is a method of applying a viscous material, in which a coating unit and a screen mask or a coating unit and a workpiece are relatively moved while applying a discharge pressure to the material, and a viscous material is applied to the workpiece. Viscosity adjustment time according to the characteristics of the coated object,
A data table that specifies viscosity adjustment conditions such as the number of viscosity adjustment operations, discharge pressure, or application conditions is stored in the control unit, and the viscosity of the viscous material and the control of the discharge pressure are controlled with reference to the data table. Characteristic viscous material application method. 9. A storage chamber for storing a viscous material, a discharge port for the viscous material provided in communication with the storage chamber, and discharge pressure adjusting means for applying a discharge pressure to the viscous material in the storage chamber. A coating unit connected to a viscous material supply means for supplying a viscous material to the object; a screen mask having an opening corresponding to the object to be coated; A viscous material coating device that relatively moves the application unit and the screen mask or the application unit and the object to be applied while applying a discharge pressure to the object, and applies a viscous material to the object to be applied. Or, on the object to be coated or on an object different from the object to be coated, the coating unit is flat against the screen mask or the object to be coated while being in contact with the screen mask or the object to be coated or the another object. A means for adjusting the viscosity of the viscous material in the storage chamber by repeating the operation of relative movement in the row direction and / or the vertical direction or repeating the expansion and contraction of the volume of the storage chamber or a combination thereof is repeated. Viscous material coating device. 10. The viscous material application device according to claim 9, wherein a means for detecting the viscosity of the viscous material in the storage chamber is provided, and the viscosity adjusting means is controlled based on the detected viscosity. 11. A storage chamber comprising a storage chamber for a viscous material, a discharge port for the viscous material provided in communication with the storage chamber, and a discharge pressure adjusting means for applying a discharge pressure to the viscous material in the storage chamber. A coating unit connected to a viscous material supply means for supplying the viscous material to the surface of the storage chamber; Is a viscous material coating device that moves the coating unit and the screen mask or the coating unit and the object to be coated while applying discharge pressure to the object, and applies the viscous material to the object to be coated, and detects the viscosity of the viscous material in the storage chamber. A viscous material application device, wherein the viscous material application pressure is adjusted according to the detected viscosity. 12. The method according to claim 10, wherein the viscosity detecting means includes pressure detecting means disposed on both sides in the moving direction of the coating unit in the storage chamber, and is configured to detect the viscosity by a differential pressure between them. 12. The viscous material coating device according to 11. 13. The viscosity detecting means includes means for detecting a moving load when the application unit relatively moves by contacting with a screen mask or an object to be coated or the another object, and detects the viscosity according to the magnitude of the load. The viscous material coating device according to claim 10, wherein the viscous material coating device is configured as described above. 14. The viscosity detecting means includes means for detecting a current flowing through a drive motor when the coating unit and the screen mask or the object to be coated or the another object are brought into contact with each other and moved relative to each other. The viscous material coating device according to claim 10, wherein the viscosity is detected. 15. A storage chamber provided with a storage chamber for the viscous material, a discharge port for the viscous material provided in communication with the storage chamber, and a discharge pressure adjusting means for applying a discharge pressure to the viscous material in the storage chamber. A coating unit connected to a viscous material supply means for supplying a viscous material to the surface; a screen mask having an opening corresponding to the object to be coated; A viscous material coating device for applying a viscous material to the object by relatively moving the application unit and the screen mask or the application unit and the object to be applied while applying a discharge pressure to the material. A data table defining viscosity adjustment conditions such as viscosity adjustment time, number of viscosity adjustment operations, discharge pressure, etc., or application conditions in accordance with the characteristics of an object to be coated or the like is stored in the control unit. Material coating device.