JPH0691848A - Screen printing device - Google Patents

Abstract

PURPOSE:To obtain a screen printing device capable of uniformly and continuously transferring coating liquid to a multi-line alignment of objects of coating. CONSTITUTION:Under the pressing force of a squeegee 4 on a screen plate 2 disposed approximately in parallel to an upper surface of a coating table 3, coating liquid is moved to be tansferred onto objects of coating 10 through openings 2a of the screen plate 2. The coating liquid remaining on the screen plate 2 is returned to its former position by a scraper 5. In this screen printing device 1, the scraper 5 is provided with scraper pieces 51 each of which is independently provided for one line of the objects of coating 10. In addition, the squeegee 4 is provided with contact parts 41 each of which is for one line of the objects of coating 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen printing apparatus for transferring a coating liquid such as an adhesive onto a coating object such as a semiconductor element using a screen plate.

[0002]

2. Description of the Related Art When a coating liquid such as an adhesive is applied to a plurality of semiconductor elements at the same time, each semiconductor element is arranged on one surface and a coating liquid is transferred from above the semiconductor elements through a screen plate. There is a printing method. A screen printing apparatus for performing this screen printing method will be described with reference to the sectional views of FIGS. 9 and 10.

That is, the screen printing apparatus 1 is
Mainly, the coating table 3 for arranging a plurality of objects 10 to be coated in multiple rows and the object 10 to be coated are arranged substantially parallel to each other with a predetermined space left between them. The screen squeegee 2 for moving the squeegee 2 while pressing the upper surface of the screen stencil 2 to transfer the coating liquid 6 such as adhesive dropped onto the screen stencil 2 onto each object 10 to be coated. 4 and a scraper 5 for evenly smoothing the coating liquid 6 remaining on the screen plate 2 after the transfer while returning to the original position.

In order to transfer the coating liquid 6 to the article to be coated 10 using the screen printing apparatus 1, first, as shown in FIG. 9, a plurality of articles to be coated 10 are placed on the coating table 3. Arrange in multiple rows. In the figure, only the arrangement state of one column (for example, 6 pieces) is shown. Next, a predetermined coating liquid 6 is dropped on the screen plate 2 arranged above the coating table 3.
A frame 21 is attached around the screen plate 2 and is kept at a predetermined tension. Then, the squeegee 4 is pressed on the screen plate 2 to move the article to be coated 10 in one direction along the row. By moving the squeegee 4, the coating liquid 6 is spread on the screen plate 2 and
The pressed portion of the screen plate 2 comes into contact with the object to be coated 10, and the coating liquid 6 extruded from the opening (not shown) of the screen plate 2 is transferred to the upper surface of the object to be coated 10. become.

Next, as shown in FIG. 10, the scraper 5 is used to move the squeegee 4 on the screen plate 2 as described above.
Move in the opposite direction of. Thereby, the article to be coated 1
The coating liquid 6 left untransferred on the upper surface of 0 is returned to its original position, and the coating liquid 6 is evenly distributed on the screen plate 2 to fill the opening with the coating liquid 6. New coated object 1
In the case of transferring the coating liquid 6 to 0, the coating liquid 6 is evenly spread on the screen plate 2 and the coating liquid 6 is embedded in the opening, so that it is shown in FIG. By moving the screen plate 2 again while pressing it with the squeegee 4, the coating liquid 6 is transferred from the opening to the upper surface of the article to be coated 10.

[0006]

However, such a screen printing apparatus has the following problems. That is, as shown in FIG. 10, when the coating liquid 6 left on the screen plate 2 is uniformly leveled on the screen plate 2 by moving the scraper 5, the viscosity of the coating liquid 6 and the coating liquid 6 and the screen The coating liquid 6 moves from the inner portion to the outer portion of the scraper 5 due to the contact resistance with the plate 2 or the like, and the thickness of the coating liquid 6 varies on the screen plate 2. When the coating liquid 6 is largely moved to the outer portion, the coating liquid 6 may not be uniformly embedded in the opening 2a formed in the screen plate 2 as shown in FIG. Then, when transferring the coating liquid 6 next time, there arises a disadvantage that the amount of the coating liquid 6 becomes insufficient.

In particular, in the case of arranging the objects to be coated 10 in multiple rows, the openings 2a formed in the screen plate 2 due to the structure of the screen plate 2 (preventing the distortion of the openings 2a due to the necessary tension between the openings 2a). Since it is necessary to increase the distance to the row next to the coating liquid 6 to some extent, the variation in the thickness of the coating liquid 6 becomes prominent, and the shortage of the coating liquid 6 occurs only after transferring 3 to 4 times. Will occur. In order to make up for such a shortage of the coating liquid 6, a new coating liquid 6 is added to the screen plate 2
It has to be replenished to the top or the coating liquid 6 that has moved to the outer portion manually must be returned to the inner portion, making it impossible to transfer the coating liquid 6 continuously. Furthermore, it takes time and labor to replenish the coating liquid 6. Therefore, it is an object of the present invention to provide a screen printing apparatus capable of transferring a coating liquid uniformly and continuously to an object to be coated arranged in multiple rows.

[0008]

The present invention is a screen printing apparatus made to solve the above problems. That is, this screen printing apparatus has a plurality of objects to be coated arranged in multiple rows on the coating table, and is substantially parallel to the upper surface of the coating table with a predetermined gap between the objects to be coated. A screen plate is arranged, and while pressing this screen plate with a squeegee from above, this squeegee is moved in the row direction of the object to be coated, and the coating liquid dropped on the screen plate is opened in the screen plate. Transfer from the part to the coated object,
By moving the scraper on the screen plate and returning the coating liquid left on the screen plate to the original position, the leveling is performed evenly. The scraper pieces are provided independently of each other. Further, this squeegee is provided with one contact portion for each row of the article to be coated.

[0009]

[Function] The scraper has one for each row of objects to be coated.
Since the three scraper pieces are provided independently of each other, when the coating liquid is evenly spread on the screen plate, the scraper pieces are individually smoothed.
For this reason, even when the rows of the openings formed in the screen plate are spaced apart from each other, the coating liquid is uniformly embedded in the openings of the respective rows. Further, also in the squeegee, since one contact portion is provided for each row of the object to be coated, the coating liquid is spread only on the portion on the screen plate where the transfer of the coating liquid is required. It will be. By using such a squeegee and a scraper, the coating liquid is not applied to unnecessary portions on the screen plate, so that the replenishment of the coating liquid is reduced.

[0010]

Embodiments of the screen printing apparatus of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view illustrating a screen printing apparatus of the present invention. That is, the screen printing apparatus 1 includes a coating table 3 for arranging the articles 10 to be coated such as semiconductor elements in multiple rows, and the coating table 3 with a predetermined space provided therebetween. A screen plate 2 arranged substantially parallel to the table 3, and a squeegee 4 for spreading a coating liquid (not shown) on the screen plate 2,
And a scraper 5 for returning the stretched coating liquid to the original position.

The screen plate 2 is made of, for example, a thin metal plate or a resin fiber woven in mesh form, and is attached to a frame 21 surrounding the outer periphery thereof with a predetermined tension. An opening 2a is formed at a position of the screen plate 2 corresponding to the object 10 to be coated, and the coating liquid is transferred to the upper surface of the object 10 to be coated through the opening 2a. Become.

For example, when the article to be coated 10 is arranged in two rows, the openings 2a are formed in the screen plate 2 in two rows corresponding to this arrangement, and further corresponding to these two rows. The contact portions 41 of the squeegee 4 are provided respectively. Further, scraper pieces 51 corresponding to these two rows are attached to the scraper 5 in an independent state.

Next, a screen printing method using the screen printing apparatus 1 will be described with reference to FIGS. First, as shown in the cross-sectional view of FIG. 2, a plurality of objects 10 to be coated are mounted on a coating table 3, and a screen plate 2 attached to a frame 21 with a predetermined space above the coating object 3 is mounted on the coating table 3. Deploy. Then, a coating liquid 6 such as an adhesive having a predetermined viscosity is dropped on the end (the left end in the figure) on the screen plate 2. In this state, the squeegee 4 moves the screen plate 2 in one direction while pressing the screen plate 2 along the line in which the objects to be coated 10 are arranged.

As shown in the plan view of FIG. 3, the opening 2a is provided at a position corresponding to the arrangement of the article 10 to be coated on the screen plate 2.
Is provided, and by moving the squeegee 4 while pressing it, the coating liquid 6 can be pushed out from the opening 2 a and transferred onto the upper surface of the article to be coated 10. As shown in the plan view of FIG. 4, the squeegee 4 is moved to the end of the screen plate 2 (the right end in the figure). As a result, the coating liquid 6 is transferred to the upper surfaces of all the objects to be coated 10, and the remaining coating liquid 6 that has not been transferred is formed between the edge on the screen plate 2 (the right edge in the figure) and the squeegee 4. It is in a state of being accumulated outside the contact part.

Next, as shown in the sectional view of FIG. 5, the coating liquid 6 accumulated on the screen plate 2 is returned to the original position on the scraper 5. The scraper 5 is provided with one scraper piece 51 independently for one row of the array of the objects to be coated 10. The scraper 5 is lightly contacted with the screen plate 2 while the squeegee 4 described above is touched. Move in the opposite direction of movement. As shown in FIG. 6, for example, the screen plate 2
When two rows of openings 2a are provided in the scraper 5, the scraper 5 is provided with two scraper pieces 51 corresponding to the two rows. As a result, the coating liquid 6 accumulated on the right end of the screen plate 2 and the outside of the contact portion of the squeegee 4 is returned to the left end of the screen plate 2 (if it is accumulated on the left end, it is returned to the right end).

As shown in the plan view of FIG. 7, the coating liquid 6 accumulated on the screen plate 2 is uniformly leveled along the movement of the scraper piece 51 of the scraper 5 and enters the opening 2a. At the same time, the coating liquid 6 is returned to the original position where it was dropped. Therefore, when the coating liquid 6 is transferred onto the upper surface of the new article to be coated 10, the coating liquid 6 is already located in front of the squeegee 4, and the coating liquid 6 may be replenished newly. It is not necessary to manually collect the coating liquid 6 in front of the squeegee 4. Moreover, since the coating liquid 6 necessary for transfer has surely entered into the opening 2a, if the squeegee 4 is moved in the row direction of the article to be coated 10 in this state, the coating liquid 6 has a uniform thickness. 6 can be transferred.

Further, as shown in the perspective view of FIG. 8, a contact portion 41 of the squeegee 4 with the screen plate 2 is formed in the opening 2a.
If one is provided for each row, the coating liquid 6 is applied along the row of the openings 2a when the coating solution 6 is extended.
That is, since the squeegee 4 does not come into contact between the rows of the openings 2a, the coating liquid 6 is spread only on the rows of the openings 2a necessary for transferring the coating liquid 6, and the portions unnecessary for the transfer are formed. Coating liquid 6 is not applied.

By using both the squeegee 4 and the scraper 5 described above, the coating liquid 6 is spread only on the portion necessary for transfer, and the coating liquid 6 accumulated on the screen plate 2 is further spread. The coating liquid 6 can be used without waste because it is pulled back along the portion required for transfer. In the present embodiment, the article to be coated 1 is placed on the coating table 3.
Although the case where the 0s are arranged in two rows has been described, the case may be more rows. In this case, the scraper pieces 51 of the scraper 5 and the contact portions 41 of the squeegee 4 may be arranged in a number corresponding to the number of rows. Should be provided.

[0019]

As described above, the screen printing apparatus of the present invention has the following effects. That is, since one scraper piece is independently provided for one row of the object to be coated on the scraper,
The coating liquid can be uniformly leveled along this arrangement.
Therefore, it becomes possible to make the coating liquid transferred to the upper surface of the object to be coated to have a uniform thickness. Further, the coating liquid remaining on the screen plate without being transferred to the upper surface of the coating object can be surely returned to the original position for each scraper piece, so that a new coating liquid may be replenished. No need. Moreover, since the squeegee is provided with one contact portion for each row of the object to be coated, the coating liquid can be spread only to a necessary portion. For these reasons, the coating liquid can be used without waste, so that continuous transfer can be performed several hundred times, and the productivity can be greatly improved. In particular, when the objects to be coated are arranged in multiple rows, it is necessary to set a certain distance to the row next to the openings formed in the screen plate. It is possible to transfer uniformly and continuously without waste.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating a screen printing apparatus of the present invention.

FIG. 2 is a cross-sectional view illustrating movement of a squeegee.

FIG. 3 is a plan view illustrating movement of a squeegee.

FIG. 4 is a plan view illustrating transfer of a coating liquid.

FIG. 5 is a cross-sectional view illustrating the returning of the coating liquid.

FIG. 6 is a plan view (1) for explaining the returning of the coating liquid.

FIG. 7 is a plan view (No. 2) for explaining the returning of the coating liquid.

FIG. 8 is a perspective view illustrating a squeegee.

FIG. 9 is a sectional view (No. 1) for explaining a conventional example.

FIG. 10 is a sectional view (No. 2) for explaining a conventional example.

FIG. 11 is a plan view illustrating a conventional example.

[Explanation of symbols]

 1 Screen Printing Device 2 Screen Plate 2a Opening 3 Coating Table 4 Squeegee 5 Scraper 6 Coating Liquid 10 Coated Product 21 Frame 41 Contact Part 51 Scraper Piece

Claims (2)

[Claims] 1. A screen printing apparatus in which a plurality of objects to be coated are arranged in multiple rows on a coating table, and a predetermined coating liquid is transferred onto each of the objects to be coated. And a screen plate arranged substantially parallel to the upper surface of the coating table with a predetermined gap between the coating plate, and the coating liquid dropped on the screen plate through the screen plate. A squeegee that moves in the column direction of the article to be coated while pressing it on the screen plate to transfer it onto the workpiece, and the coating that moves on the screen plate and remains on the screen plate. And a scraper for uniformly leveling the liquid while returning it to the original position. The scraper has one for each row of the article to be coated.
A screen printing device, in which three scraper pieces are provided independently of each other. 2. The screen printing apparatus according to claim 1, wherein the squeegee is provided with one contact portion for each row of the article to be coated.