JP2000168044A - Screen printing squeegee and screen printing device - Google Patents

Abstract

(57) [Problem] To provide a screen printing squeegee and a screen printing apparatus capable of favorably filling a pattern hole with a paste even during high-speed printing and improving productivity. I do. SOLUTION: In a screen printing squeegee for printing cream solder 16 on a substrate 6 through a pattern hole 12a by sliding on a mask plate 12, a contact portion 18a which comes into contact with the surface of the mask plate, A gap portion B provided on the traveling direction side continuously to the contact portion 18a;
A rake portion 19a having an acute-angled apex and located at the end of the gap portion B, and a curved surface portion continuous with the rake portion 19a are provided. Thereby, even when the squeegee 15 is moved at high speed, the cream solder can be filled into the pattern holes 12a satisfactorily, and the efficiency of screen printing can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen printing squeegee and a screen printing apparatus for printing paste such as cream solder or conductive paste on a substrate.

[0002]

2. Description of the Related Art In an electronic component mounting process, screen printing is used as a method for printing paste such as cream solder or conductive paste on a substrate. In this method, a mask plate having pattern holes formed in accordance with a printing target portion is set on a substrate, paste is supplied to the mask plate, and a squeegee is slid, so that the squeegee slides on the substrate through the pattern holes. Is to print the paste.

In this screen printing, a squeegee moves in a horizontal direction on a mask plate to apply paste into the pattern holes, and prints the paste on a substrate set on the lower surface of the mask plate.
Conventionally, the squeegee is filled with the paste in the pattern holes by scraping the paste by a plate-like member inclined in the traveling direction and pressing the paste against the mask plate as the squeegee moves. Was.

[0004]

However, the demand for improvement in productivity requires a reduction in the tact time in the electronic component mounting process. As a result, in screen printing, the printing speed is increased, that is, the squeegee sliding speed is reduced. It is required to increase the speed. However, when the conventional squeegee is slid at a high speed, an unfilled portion is apt to be generated in the pattern hole, which causes a problem of poor printing.

Accordingly, the present invention provides a method for high-speed printing.
It is an object of the present invention to provide a screen printing squeegee and a screen printing apparatus capable of performing favorable filling of a paste into a pattern hole and improving productivity.

[0006]

According to a first aspect of the present invention, there is provided a screen printing squeegee for printing a paste on a substrate through a pattern hole of the mask plate by sliding on a mask plate to which the paste is supplied. A printing squeegee, a contact portion that contacts the surface of the mask plate, a gap that is provided on the side of the squeegee in the direction of travel of the squeegee, and an acute angle that is located at the end of the gap. A rake portion having an apex-shaped top portion and a curved surface portion continuous with the rake portion were provided.

A screen printing squeegee according to claim 2 is the screen printing squeegee according to claim 1, wherein the second curved surface portion is provided continuously with the curved surface portion and has a larger radius of curvature than the curved surface portion. Having.

According to a third aspect of the present invention, there is provided a screen printing squeegee according to the first or second aspect, wherein the curved surface portion and / or the second curved surface portion has a curved surface formed by a combination of flat surfaces. I have.

According to a fourth aspect of the present invention, there is provided a screen printing apparatus for printing a paste on a substrate through a pattern hole of the screen mask by sliding a squeegee on a screen mask to which the paste is supplied. The squeegee is the squeegee for screen printing according to any one of claims 1, 2, and 3.

[0010] According to the present invention, the squeegee is provided with a rake portion for giving a rotational movement to the cream solder and a continuous curved portion on the rake portion, so that even when the squeegee is moved at a high speed, the pattern hole can be formed. Can be satisfactorily filled, and the efficiency of screen printing can be improved.

[0011]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a side view of a screen printing apparatus according to an embodiment of the present invention, FIG. 2A is a side sectional view of the screen printing squeegee, FIG. 2B is an enlarged sectional view of the screen printing squeegee, 3 (a), (b),
(C) is a side sectional view of the squeegee for screen printing.

First, the structure of the screen printing apparatus will be described with reference to FIG. In FIG. 1, the positioning part 1 of the substrate is
X axis table 2, Y axis table 3, and θ axis table 4
Are stacked to form a horizontal moving table, and a Z-axis table 5 is arranged thereon. On the Z-axis table 5, a substrate holder 7 for holding the substrate 6 by a clamper 8 is provided.

A screen mask 10 is disposed above the positioning section 1. The screen mask 10 is configured by mounting a mask plate 12 on a holder 11, and a pattern hole (not shown) corresponding to a printing portion of the substrate 6 to be printed is formed in the mask plate 12.

A squeegee unit 13 is provided on the screen mask 10. The squeegee unit 13 reciprocates in a horizontal direction on the mask plate 12 by moving means (not shown). The squeegee unit 13 includes a pair of squeegees 15 and a cylinder 1 for moving the squeegees 15 up and down.
4 is provided. With the cream solder 16 as the paste supplied onto the mask plate 12, the cylinder 14 is driven to bring the lower end of the squeegee 15 into contact with the upper surface of the mask plate 12, and the squeegee unit 13 is moved horizontally to slide the squeegee 15. By moving it, cream solder 1
6 is scraped on the mask plate 12 by the squeegee 15. Thus, the cream solder 16 is printed on the surface of the substrate 6 via the pattern holes of the mask plate 12.

Next, the squeegee 15 will be described with reference to FIG. In FIG. 2A, the squeegee 15 includes a holder 17, a plate 18, and a shaping member 19. The holder 17 is connected to a rod of the cylinder 14, and the squeegee 1 is driven by driving the cylinder 14.
5 moves up and down on the mask plate 12. Squeegee 15
Is lowered, the lower end portion 18a of the plate 18 contacts the surface of the mask plate 12. The shaping member 19 is mounted on a side surface of the plate 18 on the side of the squeegee 15 in the direction of travel, and forms a space A below the curved surface provided on the side of the direction of travel in which the cream solder is raked and stored.

Next, referring to FIG.
Will be described. As shown in FIG. 2B, the lower end portion 18a of the plate 18 is a contact portion that contacts the surface of the screen mask, and is continuous with the contact portion in the traveling direction side (see arrow a). Mask plate 12
A gap B having a predetermined height h substantially parallel to the above is provided.

The gap B is provided with a slack at the lower end of the shaping member 19 in order to make the contact portion contact the surface of the mask plate 12 linearly. For example, the gap B has a height of about 1 mm. It is provided with a width of ２2 mm. An apex 19a having a rake angle of an acute angle α is provided at the end of the gap B, and the apex 19a is moved in a specific direction by the cream solder 16 existing in the space A when the squeegee 15 moves in the traveling direction. It is a rake that gives exercise.

A range R1 continuous with the rake portion is a curved surface portion, and a second curved surface portion having a larger radius of curvature than the curved surface portion is provided in a range R2 continuous with the curved surface portion. . The curved surface portion and the second curved surface portion
It is provided for guiding the cream solder 16 which has been scooped upward by the rake portion 19a and given a rotational motion.

Next, screen printing using the squeegee 15 will be described with reference to FIG. In FIG. 3A, a mask plate 12 provided with pattern holes 12a is set on the surface of a substrate 6. The cream solder 16 is supplied onto the mask plate 12, and the squeegee 15 is moved in the direction of arrow b while the lower end 18 a of the squeegee 15 is in contact with the mask plate 12.
As a result, the cream solder 16 is stored in the space A between the shaping member 19 of the squeegee 15 and the mask plate 12, and the cream solder 16 is scraped in the direction of the pattern hole 12a by continuously moving the squeegee 15.

The cream solder 16 scraped by the movement of the squeegee 15 reaches the position of the pattern hole 12a and enters the pattern hole 12a. At this time, a gap S where the cream solder 16 is not filled is likely to be formed at the left end of the pattern hole 12a (on the rear side with respect to the traveling direction of the squeegee 15). On the other hand, when the squeegee 15 shown in the present embodiment is used, the cream solder 16 in the space A is given a rotational motion in the direction of the arrow c shown in the figure by the rake portion 19a, whereby the cream solder 16 Has a motion component that rotates in the space A and moves downward. Therefore, the cream solder 16 moves in a direction to fill the gap S as the squeegee 15 moves.

When the squeegee 15 moves further, the inside of the pattern hole 12a is completely filled with the cream solder 16 as shown in FIG. Therefore, it is possible to perform good cream solder printing without printing unevenness due to poor filling of the pattern holes 12a. As described above, by making the shape of the squeegee 15 as described above, even when the squeegee 15 is moved at a higher speed than before in order to reduce the printing tact time,
Stable screen printing can be performed without causing poor filling of the pattern holes 12a.

In the present embodiment, an example is shown in which the cross-sectional shape of the curved surface portion continuing to the rake portion is constituted by a curved surface such as an arc. However, the present invention is not limited to this. It may be formed.

[0023]

According to the present invention, since the squeegee is provided with a rake portion for giving a rotational movement to the cream solder and a continuous curved portion on the rake portion, the pattern can be formed even when the squeegee is moved at a high speed. Filling of the paste into the holes can be performed favorably, and efficient screen printing can be realized.

[Brief description of the drawings]

FIG. 1 is a side view of a screen printing apparatus according to an embodiment of the present invention.

FIG. 2A is a sectional side view of a screen printing squeegee according to an embodiment of the present invention. FIG. 2B is an enlarged sectional view of a screen printing squeegee according to an embodiment of the present invention.

3A is a side sectional view of a screen printing squeegee according to an embodiment of the present invention. FIG. 3B is a side sectional view of a screen printing squeegee according to an embodiment of the present invention. Side sectional view of a screen printing squeegee in the form of

[Explanation of symbols]

 Reference Signs List 6 substrate 12 mask plate 12a pattern hole 15 squeegee 18 plate 18a lower end (contact portion) 19 shaping member 19a top (rake) B void

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takaaki Sakagami 1006 Kazuma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. Term (reference) 2C035 AA06 FA32 FD01 FD22 FD37 FD42 5E319 BB05 CD29 GG15

Claims (4)

[Claims] 1. A screen printing squeegee for printing a paste on a substrate through a pattern hole of a mask plate by sliding on a mask plate to which the paste is supplied, wherein the squeegee contacts a surface of the mask plate. A contact portion, a gap portion provided continuously on the advancing direction side of the squeegee to the contact portion, a rake portion having an acute-angled apex positioned at an end portion of the gap portion, and continuous with the rake portion. A squeegee for screen printing, comprising a curved surface portion. 2. The screen printing squeegee according to claim 1, further comprising a second curved surface portion provided continuously with said curved surface portion and having a larger radius of curvature than said curved surface portion. 3. The screen printing squeegee according to claim 1, wherein the curved surface portion and / or the second curved surface portion has a curved surface formed by a combination of flat surfaces. 4. A screen printing apparatus for printing a paste on a substrate through a pattern hole of a mask plate by sliding a squeegee on a mask plate to which the paste has been supplied, wherein the squeegee is provided with a squeegee. 4. A screen printing apparatus, which is the screen printing squeegee according to any one of 2 and 3.