JP3099447B2 - Coating device and method, printing device and method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating method and apparatus for applying various coating materials such as cream solder, conductor paste, or insulator paste.

[0002]

2. Description of the Related Art Conventionally, for example, when cream solder is printed in a predetermined pattern on a circuit board, as shown in FIG. 11, a mask having openings 44a corresponding to a desired pattern formed on a circuit board 43 is used. 44, and this mask 4
The cream solder 46 is placed on the mask solder 4 by moving the squeegee 45 in the direction of the arrow X along the mask surface while contacting the mask 44 with an appropriate applied pressure.
6 is moved on the mask 44 while performing a rotational movement called rolling (hereinafter referred to as rolling), and the cream solder 4 is inserted into the opening 44 a of the mask 44 by the rolling force of the cream solder 46 and the pushing force of the squeegee 45.
6, cream solder 46 is printed on the circuit board 43 via the mask 44.

[0003]

By the way, the printing accuracy of the conventional cream solder is such that electrodes and leads of a 1.6 mm × 0.8 mm chip component or a leaded electronic component having a lead pitch of 0.65 mm are joined. Since it is only necessary to be able to respond to the land dimensions and pitch, even if there is some variation in the printing dimensions and printing thickness (hereinafter referred to as printing quality) due to changes in the physical properties of the cream solder, it was within the allowable range,
In addition, the operator could easily cope with the deviation from the allowable range by performing the adjustment.

However, recently, as circuit boards have become smaller and more dense, chip components of 1.0 mm × 0.5 mm and electronic components with leads having a lead pitch of 0.5 mm have been used. As the miniaturization of electronic components and the narrowing of lead pitches progress, land dimensions and pitches also become minute, and a decrease in printing accuracy due to a change in physical properties of cream solder has had a great effect.

However, in the conventional method of moving and applying a squeegee, since the cream solder is exposed to the atmosphere, it is impossible to avoid a change in physical properties. That is, there has been a problem that the printability is reduced due to the change in the viscosity of the cream solder with the change in the environmental temperature, and printing defects such as blurring and missing defects occur. In addition, solvent in cream solder volatilizes by contact with air,
The viscosity also changes due to the reaction between the moisture in the air and the cream solder, causing a decrease in printability as well. As a result, there has been a problem that printing with the required accuracy cannot be performed. Further, there is a problem that the cream solder is oxidized by oxygen in the air and solder balls are generated, and poor wetting is caused to deteriorate soldering quality.

Further, in the above-mentioned conventional coating method, it is not possible to supply the required amount of cream solder at a time, and it is necessary to supply the cream solder at relatively short time intervals.
In addition, there is also a need to collect the cream solder protruding to the side of the mask due to the movement of the squeegee. There was also a problem.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a coating method and apparatus capable of performing high-precision coating and improving productivity.

[0008]

The present invention has a pushing means.
Opposing each other near the opening of the main body, and
The angle between the opposite side and the surface to be coated is obtuse
Coating method using a coating device having a pair of scrapers
Wherein the pair of scrapers are elastically supported.
And the tip of the scraper is brought into contact with the surface to be coated.
Move relatively on the surface to be coated while contacting
The application material stored inside the main body is pushed by the pushing means.
Sends out from the opening by force and applies it to the surface to be coated
A coating method of, the coating apparatus of the present invention the inner coating material
A storage portion to be stored in the storage portion, and a coating material stored in the storage portion
Opening for discharging the coating material, and the coating material is moved forward by a pressing force.
Pushing means for feeding out toward the opening, and near the opening
And the surface on the side facing each other and the front
The angle between the coating surface and the surface to be coated becomes obtuse and
A pair of scrapers that are supported and can adhere to the surface to be coated
Characterized by comprising and.

Preferably, a circuit board or a circuit through a mask is used.
Suitable for printing on circuit boards.

[0010]

According to the coating method and apparatus of the present invention, the pressing means
As a result , the coating material in the storage section is sent out to the space opened to the outside between the pair of scrapers and is applied on the surface to be coated, so that the coating material in the storage section comes into contact with the atmosphere to cause a change in physical properties. Without lowering printability and applicability,
Highly accurate coating is possible.

[0011] Also, the surface to be coated can be densely filled with a coating material.
The material applied to the surface to be coated
-Enables scraping and collection.

And adhesion between the surface to be coated and the scraper.
Of the coating material by the pushing means.
Coating material leaks from the contact point between the rape and the surface to be coated
High-density filling, and
There is no need to apply a coating material to a necessary portion.

Increase the contact force between the scraper and the surface to be coated
Line the operation of coating the fabric or printed in proper contact force without Kusuru
The coating material applied to the surface to be coated can be
No extra scraping by the rapper, and a film for printing and coating
The thickness can be improved with high accuracy.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of a coating method and an apparatus of the present invention, a method and an apparatus for printing a cream solder as a fluid will be described below with reference to FIGS.

In FIG. 1, 1 is a cream solder 3 on the surface.
Is a circuit board to be printed and applied. Reference numeral 2 denotes a metal mask disposed thereon, and an opening 2a is formed corresponding to the printing pattern. An application head 4 moves on the metal mask 2 and applies the cream solder 3. The application head 4 includes a main body 5 in which an application rotating body 7 is accommodated and arranged, and a supply unit 6 that supplies the cream solder 3 into the main body 5. It is configured.

The coating rotator 7 has a plurality of ridges 8 formed in the outer peripheral portion along the axial direction, and a housing recess 9 for housing the cream solder 3 is formed between the ridges 8. The cross-sectional shape of the ridge 8 is not limited to a triangular shape as shown in FIGS. 1 and 3A, but may be a trapezoidal shape as shown in FIG. 3B, and further as shown in FIG. As described above, the shape may be such that the accommodation recess 9 has an arc shape. Further, the ridges 8 may be continuous or intermittent over the entire length in the axial direction, and may be formed in a spiral shape not completely parallel to the axial center.

The main body 5 has a cylindrical internal space 10 into which the coating rotator 7 is rotatably fitted, and an opening 11 is formed below the internal space 10. A supply path 12 communicating with the supply section 6 is formed on the opposite side of the internal space 10 from the opening 11. Opening 11
Is configured so that a part of the outer peripheral portion of the coating rotator 7 is exposed to the outside as shown in FIG. 1, but may be configured so as not to be exposed as shown in FIG. This internal space is a storage section for storing the coating material.

Scrapers 13 are arranged on both sides of the opening 11 of the main body 5 so that the tip comes into contact with the surface of the metal mask 2 at a predetermined contact pressure. Scraper 13
The spring 14 is urged toward the metal mask by a spring 14, and the arrangement position thereof can be adjusted by an adjustment screw 15. In the illustrated example, the tip of the ridge 8 of the coating rotating body 7 is configured not to be in contact with the inner peripheral surface of the internal space 10 of the main body 5 and the scraper 13, but may be in contact with the scraper 13. It is sufficient that the tip of the ridge 8 does not contact the surface of the metal mask 2 when it is brought into contact with the surface of the metal mask 2, and the internal space 10 may be sealed from the external space.

The supply unit 6 includes a container 16 for accommodating the cream solder 3 therein, pressurized air supply means 17 for supplying pressurized air into the container 16 from its upper end, and moves into the container 16. The float 18 is freely arranged. A supply port 19 communicating with the supply path 12 of the main body 5 is formed at a lower end of the storage container 16, and an opening / closing valve 20 is provided in the supply port 19. Further, an initial filling port 21 for initially filling the cream solder 3 is formed so as to open in the vicinity of the on-off valve 20, and the cream solder 3 is replenished halfway to a position above the initial filling port 21 by an appropriate distance. A filling port 22 is formed. On-off valve 20
Agitate the cream solder 3 in the vicinity of
A stirring blade 23 for smoothing the flow of the liquid is provided.

A metal piece 24 is provided at an appropriate location on the outer periphery of the float 18. On the other hand, when the float 18 moves between the vicinity of the upper end in the container 16 and the position near the filling port 22, the metal piece 2
A position detection sensor 25 for detecting the position of the solder paste 4 is provided, and the metal piece 24 and the position detection sensor 25 constitute a remaining amount detection unit for the cream solder 3. Float 18
Is formed with an air vent hole 26 penetrating vertically, and a check valve 27 for preventing air from entering the cream solder filling chamber 29 below the float 18 from the pressurizing chamber 30 above the float 18. ing. A filter 28 is provided to prevent the cream solder 3 from entering the pressurizing chamber 30 when the cream solder 3 is filled.

A holder 31 is provided so as to cover the outer surfaces of the main body 5 and the housing 16, and a temperature regulating water circulation passage 32 is formed in the holder 31. This circulation passage 3
2 is supplied with appropriate temperature-adjusted water by a temperature-adjusted water controller 33 based on the temperature measured by the temperature sensor 34;
The configuration is such that the temperature of the cream solder 3 in the main body 5 and the storage container 16 is kept constant. Also, the holder 31
And a heat insulating material layer 3 covering the outer surface of the scraper 13.
5 are formed.

In the above configuration, in order to print the cream solder 3, first, the cream solder 3 is filled in the container 16. At this time, the on-off valve 20 is first closed, the cream solder 3 is filled from the initial filling port 21, and the cream solder 3 is filled from the lower end of the solder filling chamber 29 to reduce air entrapment. When the cream solder 3 is filled to a position beyond the filling port 22, pressurized air is supplied into the pressurized chamber 30 by the pressurized air supply means 17 and the float 1 is supplied.
8 is pressed down and brought into close contact with the filled cream solder 3. At that time, the air remaining in the solder filling chamber 29 is pushed out into the pressurizing chamber 30 by opening the check valve 27 from the air vent hole 26 as shown by a broken line. A filter 28 is provided below the air vent hole 26 so as to allow air to pass through but not the cream solder 3 so as to prevent the cream solder 3 from flowing into the pressurizing chamber 30. After the air is released, the supply of the pressurized air is stopped, the required amount is filled from the initial filling port 21, and the initial filling of the cream solder 3 is performed. Further, the remaining amount of the contained cream solder 3 is detected by the position detection sensor 25, and when the remaining amount decreases, the cream solder 3 is appropriately replenished from the filling port 22.

Next, in order to print the cream solder 3 on the circuit board 1 by the coating head 4, the coating head 4 is first arranged vertically on the metal mask 2, and the tip of the scraper 13 is placed on the surface of the metal mask 2. And awaits at the moving end position. In this state, while the pressurized air is supplied from the pressurized air supply means 17 of the coating head 4, the on-off valve 20 is opened and the coating rotating body 7 is rotationally driven in the moving direction of the coating head 4 as shown by the arrow Z. . Then, the cream solder 3 filled in the storage container 16 enters the internal space 10 of the main body 5 from the supply port 19 via the supply path 12 of the main body 5, and is sequentially filled in each of the storage recesses 9 of the application rotating body 7. Go. In this state, as shown in FIG.
Are sequentially supplied, and the space formed by the metal mask 2, the scraper 13, the internal space 10 of the main body 5, and the coating rotator 7 is filled with the cream solder 3.

Next, when the coating head 4 is moved in the direction of arrow Y, as shown in FIG. 2, the filled cream solder 3 flows in the flow direction A due to the rotation of the coating rotator 7 and is generated by this. By the pushing force B, the cream solder 3 is reliably pushed into the opening 2a of the metal mask 2 and filled. Then, the excess cream solder 3 is scraped off by the subsequent scraper 13 and collected. Thus, the cream solder 3 is reliably and precisely filled in the opening 2a of the metal mask 2 so that the pattern of the cream solder 3 corresponding to the opening 2a of the metal mask 2 is formed on the circuit board 1 via the metal mask 2. Is printed.

In this printing process, most of the cream solder 3 is contained in a sealed container 16,
The cream solder 3 immediately before printing is also formed by the scraper 13, the internal space 10 of the main body 5, and the coating rotating body 7.
Since it is located in a closed space and is sealed from the outside atmosphere, the viscosity of the cream solder 3 does not change due to volatilization of the solvent in the cream solder 3 or the reaction between the moisture in the air and the cream solder 3. In addition, the printability does not decrease due to the change in viscosity due to such a cause. In addition, cream solder 3
Does not come into contact with air, the cream solder 3 is not oxidized by the reaction with oxygen or moisture in the air, the activation force is not reduced, and soldering defects such as solder balls and poor wetting are also generated. It can be effectively prevented. Further, the periphery of the main body 5 and the supply section 6 of the coating head 4 is surrounded by a holder 31 having a temperature-adjusted water circulation passage 31, so that the temperature of the cream solder 3 contained therein is kept constant. Also, the temperature of the cream solder 3 does not change due to the change in the environmental temperature, and the printability does not deteriorate due to the change in the viscosity of the cream solder due to the temperature change. Thus, high-precision printing without printing defects such as bleeding and missing defects can be performed, and the cause of soldering failure during reflow after printing / component mounting can be eliminated.

Further, by storing the required amount of cream solder 3 in the container 16, it is possible to operate for a long time, and the productivity is improved.

In the above-described embodiment, an example in which the shaft-shaped coating rotating body 7 is used as the coating rotating body is shown. However, as shown in FIGS. It is also possible to use an application belt 36 in which the accommodation recess 9 is formed. The application belt 36 includes a pair of rollers 3 as shown in FIGS.
In FIG. 5, an intermediate roller 38 is disposed between the rollers 37 and 37 to provide tension and to make an angle with respect to the surface to be coated.

In the above-described embodiment, the supply section 6 is provided as cream solder supply means, and the solder filling chamber 29 is filled with the cream solder 3 and supplied to the main body 5 as shown in FIG. Alternatively, the sealed container 39 in which the cream solder 3 is sealed and filled in advance may be arranged in the supply unit 6 and supplied to the main body 5. In the example of FIG. 7, a sealed container 39 called a syringe having a float inside is arranged, pressurized air is supplied from the pressurized air supply means 17, and the cream solder 3 is newly added to the main body 5. May be sequentially replaced with the sealed container 39 in which is filled.

In the above-described embodiment, the supply unit 6 serving as cream solder supply means is attached to the coating head 4 together with the main body 5.
However, as shown in FIG. 8, the application head 4 may be composed of the main body 5 and its holder 31, and the cream solder supply means may be provided outside the application head 4. FIG.
In the example, the supply path 4 formed at the position of the axis of
0, the cream solder 3 is supplied via an appropriate pressure feed pipe, and a distribution passage 41 formed radially from the supply passage 40.
The cream solder 3 is supplied into each of the accommodation concave portions 9.

Further, in the above-described embodiment, an example is shown in which the supply path 12 is provided at one central portion on the opposite side to the opening 11 of the main body 5, but as shown in FIGS. Supply paths 42a and 42b may be provided on both sides of the body 7, respectively. 9 and 10, the main unit 5 and the supply unit 6 are provided.
Are provided integrally. Then, in FIG.
The solder filling chamber 29, the float 18 and the pressurizing chamber 30 are provided respectively corresponding to the a and b, and the supply paths 42a and 42b are communicated with the common single solder filling chamber 29 in FIG. , Any of these methods can be used.

In the above embodiment, the cream solder 3
Is printed using the metal mask 2, but the present invention can be applied to screen printing as it is. Further, the present invention is applicable not only to printing but also to other coating apparatuses. For example, if a predetermined gap is provided between the tip of the scraper 13 and the surface to be coated, the coating can be applied to a coating apparatus that forms a uniform coating film.

[0032]

According to the coating method and apparatus of the present invention,
The coating material is stored in the storage section in a non-open state with respect to the outside, and the coating material in the storage section is sent out by a pushing means to a space opened to the outside between the pair of scrapers and is coated on the surface to be coated. Therefore, the coating material in the storage section does not come into contact with the atmosphere to cause a change in physical properties, does not cause deterioration in printability and coatability, and enables highly accurate coating.

Also, the material to be coated can be densely filled with the coating material.
The material applied to the surface to be coated
-Enables scraping and collection.

Then, the adhesion between the surface to be coated and the scraper
Of the coating material by the pushing means.
Coating material leaks from the contact point between the rape and the surface to be coated
High-density filling, and
There is no need to apply a coating material to a necessary portion.

The contact force between the scraper and the surface to be coated is
Hand coating or printing operation to an appropriate contact force without increasing
The coating material applied to the surface to be coated can be
Printing and coating without scraper scraping
It is possible to improve the thickness of the film with high accuracy.

[Brief description of the drawings]

FIG. 1 is a sectional view of a coating apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory view of an operation of a coating process of the coating apparatus shown in FIG.

FIG. 3 is a cross-sectional view showing another embodiment of the cross-sectional shape of the coating rotator.

FIG. 4 is a sectional view of a second embodiment of the main body according to the present invention.

FIG. 5 is a side view of a coating rotator according to a second embodiment of the present invention.

FIG. 6 is a side view of a third embodiment of an application rotating body according to the present invention.

FIG. 7 is a sectional view showing a schematic configuration of a second embodiment of the present invention.

FIG. 8 is a sectional view of a third embodiment of the present invention.

FIG. 9 is a sectional view showing a schematic configuration of a fourth embodiment of the present invention.

FIG. 10 is a sectional view showing a schematic configuration of a modification of the fifth embodiment of the present invention.

FIG. 11 is a sectional view of a conventional example.

[Explanation of symbols]

 Reference Signs List 4 coating head 5 main body 6 supply section 7 coating rotator 8 ridge 9 storage recess 11 opening 12 supply path 13 scraper 16 storage container 17 pressurized air supply means 18 float 20 opening / closing valve 23 stirring blade 24 metal piece 25 position detection Sensor 26 Air vent hole 27 Check valve 32 Temperature control water circulation passage 33 Temperature control water control device

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-242993 (JP, A) JP-A-4-284249 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41F 15/00-15/46

Claims (14)

(57) [Claims] 1. The method according to claim 1, further comprising the step of:
The surface to be coated is placed facing
Has a pair of scrapers that form an obtuse angle with the cloth surface
A coating method using a coating device,
The raper is elastically supported and the tip of the scraper
Is brought into contact with the surface to be coated and adhered to the surface to be coated.
The upper part is moved relatively, and the coating stored inside the main body
The material is fed from the opening by the pushing force of the pushing means.
A coating method for taking out and applying to the surface to be coated . 2. The method according to claim 1 , further comprising the step of:
The surface and the mark which are arranged opposite to each other and which are opposite to each other
Has a pair of scrapers whose angle with the printing surface is obtuse
A printing method using a printing apparatus,
The raper is elastically supported and the tip of the scraper
The printing surface is brought into contact with the printing surface while being in close contact with the printing surface.
The upper part is moved relatively, and the coating stored inside the main body
The material is fed from the opening by the pushing force of the pushing means.
A printing method for ejecting and applying on the printing surface . 3. The device according to claim 1, wherein said body has a pushing means.
The surface and the circuit on the side opposite to each other and facing each other
It has a pair of scrapers whose angle with the substrate surface is obtuse.
A printing method using a printing apparatus, comprising:
The scraper is elastically supported, and the tip of the scraper is
While holding the edge of the circuit board in close contact with the circuit board,
The body is moved relatively on the plate, and the coating
The cloth material is fed from the opening by the pushing force of the pushing means.
A printing method of drawing out and applying to the circuit board . 4. A mask opening corresponding to a print pattern.
Book having a pressing means on which a mask having
Opposed to each other near the opening in the body and opposed to each other
The angle between the surface on the opposite side and the mask surface is an obtuse angle.
A printing method using a printing apparatus having a scraper.
The pair of scrapers are elastically supported, and the
Keep the tip of the scraper in contact with the mask
Then, move relatively on the mask,
The stored coating material is pressed by the pressing force of the pressing means.
Printing method to send out from the opening and apply it to the circuit board
Law . 5. A storage section for storing a coating material therein, and
An opening for discharging the coating material stored in the storage section;
The coating material is sent out toward the opening by a pressing force.
A pushing means, which is disposed opposite to the vicinity of the opening,
The angle between the surfaces facing each other and the surface to be coated is blunt.
Becomes a corner and is elastically supported, allowing close contact with the surface to be coated
A coating device including a pair of scrapers . 6. A storage section for storing a coating material therein, and
An opening for discharging the coating material stored in the storage section;
The coating material is sent out toward the opening by a pressing force.
A pushing means, which is disposed opposite to the vicinity of the opening,
Angle between the surface on the side facing the two and the surface to be printed is blunt.
Angled and elastically supported, allowing close contact with the printing surface
A printing device comprising a pair of scrapers . 7. A storage section for storing a coating material therein, and
An opening for discharging the coating material stored in the storage section;
The coating material is sent out toward the opening by a pressing force.
A pushing means, which is disposed opposite to the vicinity of the opening,
Angle between the surface on the opposite side and the circuit board surface is obtuse
And it is elastically supported and can adhere to the circuit board surface
A printing device comprising a pair of scrapers . 8. A mask opening disposed on a circuit board and having a mask opening
And a storage section for storing the coating material inside
And an opening for discharging the coating material stored in the storage section
And feeding the coating material toward the opening by a pressing force.
Pushing out means, which is disposed opposite to the vicinity of the opening.
And the angle between the surfaces facing each other and the mask surface is
Has a pair of obtuse scrapers and elastic
Pair of scrapers that can be securely supported and adhere to the mask
Printing device provided with a printer . 9. A pair of scrapers are directed toward a surface to be coated.
6. The device of claim 5, wherein the device is biased and the biasing force is adjustable.
Coating equipment. 10. A pair of scrapers are directed to a printing surface.
7. The method according to claim 6, wherein the biasing force is adjustable.
Printing device. 11. A pair of scrapers are directed to a circuit board.
And the biasing force is adjustable.
Printing device. 12. A pair of scrapers facing the mask
9. The device of claim 8, wherein the device is biased and the biasing force is adjustable.
Printing equipment . 13. A pair of scrapers are provided at the center of the opening.
10. The image display device according to claim 5, wherein the display device is disposed at a position substantially symmetrical to the left and right.
3. The coating device according to claim 1 . 14. A pair of scrapers are located at the center of the opening.
Claims 6 to 8, 1 which are arranged at substantially symmetrical positions with respect to
13. The printing device according to any one of 0 to 12 .