JP2007168127A - Equipment and method for screen printing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably print a printing material (e.g. a solder paste) on a surface to be printed (e.g. a printed board surface). <P>SOLUTION: The screen printing equipment has at least two masks and a means for forming the mask for screen printing of which the opening pierces in the direction of the thickness of the masks laid on each other. This equipment is provided, for instance, with a means for laying the mask for screen printing on the surface to be printed, a means for filling the printing material in a space set by the surface to be printed whereon the mask for screen printing is laid and by the opening, and a means for separating the masks sequentially after the filling operation by the filling means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a screen printing apparatus, and more particularly to a technique for stably printing a printing material (for example, cream solder) on a printing surface (for example, a printed board surface).

  Conventionally, printing with cream solder has been performed on a surface to be printed such as a printed circuit board from the viewpoint of good soldering.

  This conventional printing process will be described with reference to the drawings. First, as shown in FIGS. 17A and 17B, a mask M ′ for screen printing (one mask with an opening penetrating in the thickness direction) is overlaid on the surface of the printed circuit board P, and this mask M ′. The squeegee S is moved along the surface (in the direction of the arrow in the figure) to fill the space defined by the printed circuit board surface and the opening with the cream solder K. After this filling operation, the mask M ′ is separated from the surface of the printed board P as shown in FIG. Thereby, the cream solder K filled in the space remains (transferred) on the surface of the printed circuit board by the adhesive force, and printing is completed.

  However, in the conventional printing process, as shown in FIG. 18, a part (or all) of the cream solder K filled in the space remains on the mask M ′ side and is transferred to the printed board surface by that amount. Cream solder K may be reduced (that is, solder removal at the time of mask separation becomes worse), and the cream solder K cannot be printed stably. In particular, when the ratio (aspect ratio) between the inner wall area of the opening and the cross-sectional area of the opening is larger than a certain value (for example, when an opening of about 300 μm or less is formed in a general mask having a thickness of 120 to 150 μm), solder The bad omission is conspicuous.

In addition, there is a screen printing method that is intended to improve the plate slip-off property that seems to be related to the present invention (Patent Documents 1 and 2), both of which relate to a printing method using a single mask.
JP-A-7-304152 JP 2000-127347 A

  The subject of this invention is providing the technique for printing a printing material (for example, cream solder) stably on a to-be-printed surface (for example, printed circuit board surface).

  The present invention has been made to solve the above-described problems, and adopts the following configuration.

  A screen printing apparatus comprising: at least two masks; and a mask forming unit that forms a mask for screen printing in which an opening penetrates in the thickness direction by overlapping each of the masks.

  According to the present invention, it is possible to constitute a screen printing mask through which an opening penetrating in the thickness direction passes by overlapping at least two masks.

  In the screen printing apparatus, for example, in a space defined by the screen printing mask and the surface to be printed, the printing surface on which the screen printing mask is overlaid, and the opening. Filling means for filling the printing material; and separation means for sequentially separating the masks after the filling operation by the filling means.

  In this way, the printing material (for example, cream solder) can be filled in the space defined by the printing surface on which the mask for screen printing is superimposed and the mask opening for screen printing, as in the past. At the same time, after this filling operation, the masks can be sequentially separated. That is, since each mask is sequentially separated, the contact area between the cream solder and the mask (the inner wall of the opening penetrating through the mask) is smaller than that in the conventional case when separating each mask. (Solder) comes off well. That is, stable screen printing is possible regardless of the size of the opening penetrating the mask (regardless of the aspect ratio).

  Further, the present invention can be specified as follows.

  A mask for screen printing in which an opening penetrates in the thickness direction by overlapping the first mask and the second mask by overlapping the first mask superimposed on the printing surface, the second mask superimposed on the first mask, and the second mask. A screen printing apparatus comprising: a mask constituting unit.

  According to the present invention, it is possible to configure a screen printing mask in which an opening penetrates in the thickness direction by overlapping the first mask and the second mask.

  In the screen printing apparatus, for example, a printing material is formed in a space defined by the means for overlapping the screen printing mask and the printing surface, the printing surface on which the screen printing mask is stacked, and the opening. Filling means for filling the first mask, after the filling operation by the filling means, a first separating means for separating the second mask from the first mask, and after the separating operation by the first separating means, Second separating means for separating from the printing surface.

  According to this, it is possible to fill the printing material (for example, cream solder) in the space defined by the printing surface on which the mask for screen printing is overlapped and the mask opening for screen printing, as in the past. At the same time, after this filling operation, it is possible to first separate the second mask and then separate the first mask. That is, since each mask is sequentially separated, the contact area between the cream solder and each mask (the inner wall of the opening penetrating through the mask) is smaller than that in the prior art at the time of separating each mask. (Cream solder) comes off well. That is, stable screen printing is possible regardless of the size of the opening penetrating the mask (regardless of the aspect ratio).

  Further, in the screen printing apparatus, for example, the mask constituting unit overlaps the first mask and the second mask so as to be in surface contact with each other.

  This is an example of how to overlap.

  Further, in the screen printing apparatus, for example, the mask constituting unit overlaps the first mask and the second mask at a constant interval.

  This is also an example of how to overlap. In this case, for example, when a squeegee is used as the filling means, at least a portion of the second mask where the squeegee is located is elastically deformed and the second mask and the first mask are in surface contact with each other, so that the printing material is used. Easy to fill. On the other hand, after filling the printing material, the second mask naturally returns to the shape before elastic deformation. That is, it is possible to separate the second mask from the first mask even though the configuration for moving the first mask (for example, the motor MO and the ball screw N in the first embodiment) is not provided. Therefore, the structure of the screen printing apparatus can be simplified.

  In the screen printing apparatus, for example, the end of the opening penetrating the first mask is chamfered.

  If it does in this way, it will become possible to prevent that the opening edge part contacts a cream solder and scrapes off at the time of 1st mask isolation | separation.

  In the screen printing apparatus, for example, the opening penetrating the second mask is smaller than the opening penetrating the first mask.

  If it does in this way, it will become possible to prevent that the opening edge part contacts a cream solder and scrapes off at the time of 1st mask isolation | separation.

  In the screen printing apparatus, for example, the first mask is made of a material having lower rigidity than the second mask.

  Since the first mask is a mask made of a material with lower rigidity, even if unevenness or warpage occurs on the surface to be printed, since the ratio of close contact with the surface increases, It is possible to prevent the printing material from bleeding from between the mask and the mask. In addition, by using the second mask as a mask made of a material having higher rigidity, the wear can be reduced, and printing can be stably performed for a long period of time. For example, it is conceivable that the second mask is made of a metal material and the first mask is made of an elastic material, a synthetic resin, or a rubber material. This is an example of the material constituting each mask.

  In the screen printing apparatus, for example, the first mask and the second mask have different thicknesses. For example, the thickness of the second mask is larger than the thickness of the first mask.

  This is an example of the thickness of each mask. Since the second mask is easier to be removed even if the aspect ratio is larger, this makes it possible to reduce the aspect ratio of the first mask and print more stably.

  The screen printing apparatus further includes, for example, means for cleaning a contact surface between the first mask and the second mask.

  In this way, it is not necessary to stop the machine and clean each mask, so that production efficiency can be improved.

  In the screen printing apparatus, for example, the printing material is cream solder.

  This is an illustration of a printing material.

  Moreover, this invention can be specified as follows as invention of a method.

  A screen printing mask with an opening penetrating in the thickness direction is formed by overlapping at least two masks, and a printing material is filled in a space defined by the printing surface on which the screen printing mask is to be overlaid and the opening. Then, after the filling operation, the masks are sequentially separated.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to print a printing material (for example, cream solder) stably on a to-be-printed surface (for example, printed circuit board surface).

  Hereinafter, a screen printing apparatus according to an embodiment (first embodiment) of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram for explaining the main configuration of the screen printing apparatus. As shown in FIG. 1, the screen printing apparatus 10 includes two upper and lower masks M1 and M2. Note that an appropriate number of masks can be provided as necessary.
(Upper mask support structure)
As shown in FIGS. 1 and 2, the upper mask M1 is, for example, a metal mask reinforced by being surrounded by a frame M1a, and a plurality of openings M1b penetrate therethrough. As shown in FIG. 1, the frame M1a of the upper mask M1 is fixed to the left and right mask support plates 20 by screws or the like, and maintains a substantially horizontal posture.

  Each mask support plate 20 is formed with a screw hole 21 into which the ball screw N is screwed in the thickness direction. Note that a squeegee 50 as a filling means of the present invention is disposed between the left and right mask support plates 20.

A ball screw N is screwed into each screw hole 21. Therefore, when a fixed motor MO is rotated (or reversely rotated) as will be described later, each ball screw N rotates at the same speed at the same position ( As a result, the mask support plate 20 and the upper mask M1 fixed to the mask support plate 20 can be brought into and out of contact with the lower mask M2 while maintaining a substantially horizontal posture (can be moved up and down).
(Lower mask support structure)
As shown in FIG. 3, the lower mask M2 is, for example, a metal mask reinforced by being surrounded by a frame M2a, and a plurality of openings M2b penetrate therethrough. The size and arrangement of the opening M2b are the same as the size and arrangement of the opening M1b in the upper mask M1. As shown in FIG. 1, the frame M2a of the lower mask M2 is fixed to the left and right mask support frames 30, respectively, and maintains a substantially horizontal posture. The lower mask M2 is larger than the upper mask M1 (see FIG. 4).

  The upper end of each mask support frame 30 extends substantially horizontally inward to form an upper end plate 31, and each upper end plate 31 is formed with a through hole 32 through which the ball screw N is inserted in the thickness direction. A ball screw N is inserted into each through hole 32 via a bearing or the like, and can be rotated at the same position. A motor MO that rotates coaxially with the ball screw N is connected to the upper end of the ball screw N that is inserted into one through hole 32 (right side in the figure). Further, the ball screw N and the other ball screw N are connected. Are connected by a chain belt B (or rubber belt) or the like. Therefore, when the motor MO rotates (or reversely rotates), each ball screw N rotates at the same speed at the same position. As a result, the mask support plate 20 and the upper mask M1 fixed to the mask support plate 20 can be brought into and out of contact with the lower mask M2 while maintaining a substantially horizontal posture (can be raised and lowered).

That is, when the upper mask M1 is lowered to a predetermined position while maintaining a substantially horizontal posture, the upper mask M1 and the lower mask M2 are overlapped with each other as shown in FIG. It is possible to constitute a screen printing mask M through which an opening Mb) constituted by the opening M1b and the opening M2b passes. Further, the upper mask M2 can be separated from the lower mask M2 by raising the upper mask M2 to a predetermined position while maintaining a substantially horizontal posture.
(PCB support structure)
The printed circuit board P is placed on the substrate stage 40. The substrate stage 40 is disposed below the lower mask M2, and when the motor rotates (or reversely rotates) due to the action of a ball screw N connected to a motor (not shown), the substrate stage 40 is thereby caused. In addition, the printed circuit board P placed thereon can be brought into and out of contact with the lower mask M2 (can be raised and lowered).

  Next, a printing operation of the screen printing apparatus 10 according to the present embodiment will be described with reference to the drawings.

  FIG. 5 is a flowchart for explaining the printing operation of the screen printing apparatus 10 of the present embodiment.

  The following printing operation is mainly performed by a control device such as a CPU (not shown), and before the printing operation is started, the upper mask M1 and the lower mask M2 are brought into surface contact as shown in FIG. In this way, it is assumed that a mask M for screen printing is formed through which a plurality of openings (openings Mb formed by the openings M1b and M2b) pass in the thickness direction.

  First, the printed circuit board P is carried onto the substrate stage 40 and is set to a correct posture (steps S2 and S4). Next, a motor (not shown) rotates, and as a result, as shown in FIG. 6A, the printed circuit board P on the substrate stage 40 rises to a predetermined printing position while maintaining a substantially horizontal posture. (Step S6, (1) in FIG. 1), the one-side squeegee 50 is lowered to a predetermined position (Step S8, (2) in FIG. 1).

  As shown in FIG. 6B, the one-side squeegee 50 moves along the surface of the screen printing mask M (upper mask M1), so that the surface of the printed circuit board P on which the screen printing mask M is superimposed. And a space defined by the opening Mb is filled with cream solder K (step S10, (3) in FIG. 1). When this filling operation is completed, the one-side squeegee 50 rises to a predetermined position (step S12, (4) in FIG. 1).

  Next, when the motor MO is rotated, the ball screws N are rotated at the same speed at the same position. As a result, as shown in FIG. 6C, the mask support plate 20 and the upper mask fixed thereto are obtained. M1 rises while maintaining a substantially horizontal posture (step S14, (5) in FIG. 1). That is, the upper mask M1 is separated from the lower mask M2.

  Next, a motor (not shown) rotates, and as a result, as shown in FIG. 6D, the substrate stage 40 and the printed circuit board P placed thereon are lowered (step S16 in FIG. 1). 6)). That is, the lower mask M2 is separated from the surface of the printed circuit board P.

  Thereafter, the upper mask M1 is lowered to a predetermined position while maintaining a substantially horizontal posture, and as shown in FIG. 1, the upper mask M1 and the lower mask M2 are overlapped so as to be in surface contact with each other. A screen printing mask M through which a plurality of openings Mb penetrate in the thickness direction is formed (step S18, (7) in FIG. 1). Finally, the printed circuit board P on which the cream solder K is printed is carried out (step S20).

  As described above, according to the screen printing apparatus 10 of the present embodiment, the upper mask M1 and the lower mask M2 are stacked so as to be in surface contact with each other, and thus the screen printing mask through which the opening Mb passes in the thickness direction. M is configured (see FIG. 6A). Then, the solder paste K is filled in the space defined by the surface of the printed circuit board P on which the mask M for screen printing and the opening Mb are overlapped (see FIG. 6B). The mask M1 is separated (see FIG. 6C), and then the lower mask M2 is separated.

  That is, since the masks M1 and M2 are sequentially separated, the contact area between the cream solder K and the masks M1 and M2 (the inner walls of the openings M1b and M2b penetrating through the masks) is smaller than that in the conventional case. Therefore, the cream solder can be easily removed during mask separation. That is, stable screen printing is possible regardless of the size of the opening Mb penetrating the mask M (regardless of the aspect ratio).

  Hereinafter, a screen printing apparatus according to another embodiment (second embodiment) of the present invention will be described with reference to the drawings.

  FIG. 7 is a diagram for explaining the main configuration of the screen printing apparatus 10 ′ of the present embodiment.

  As shown in FIG. 7, the screen printing apparatus 10 ′ of the present embodiment overlaps the upper mask M <b> 1 and the lower mask M <b> 2 at a constant interval (for example, an interval equivalent to the thickness of the upper mask M <b> 1). A screen printing mask M is formed through which a plurality of openings (openings formed by openings M1b and M2b) pass in the thickness direction. Unlike the screen printing apparatus 10 according to the first embodiment, the screen printing apparatus 10 ′ according to the present embodiment does not include a configuration (motor MO, ball screw N, etc.) for raising and lowering the upper mask M1. That is, the frame M1a of the upper mask M1 is fixed to the left and right mask support frames 30 by screws or the like, and maintains a substantially horizontal posture. Since other configurations are the same as those of the screen printing apparatus 10 of the first embodiment, the same reference numerals are given and description thereof is omitted.

  Next, the printing operation of the screen printing apparatus 10 ′ of this embodiment will be described with reference to the drawings.

  FIG. 8 is a flowchart for explaining the printing operation of the screen printing apparatus 10 ′ of the present embodiment.

  The following printing operation is mainly performed by a control device such as a CPU (not shown).

  First, the printed circuit board P is carried onto the substrate stage 40 and is set to a correct posture (steps S30 and S32). Next, a motor (not shown) rotates, and as a result, as shown in FIG. 9A, the printed circuit board P on the substrate stage 40 is raised to a predetermined printing position while maintaining a substantially horizontal posture. (Step S34, (1) in FIG. 8), the one-side squeegee 50 is lowered to a predetermined position (Step S36, (2) in FIG. 8).

  As shown in FIG. 9B, the one-side squeegee 50 moves along the surface of the screen printing mask M (upper mask M1), whereby the surface of the printed board P on which the screen printing mask M is superimposed. And a space defined by the opening Mb is filled with cream solder K (step S38, (3) in FIG. 8). Since the squeegee 50 moves while applying pressure so as to press the masks M1 and M2 against the substrate stage 40 (printed substrate P), at least the squeegee 50 is positioned as shown in FIGS. The upper mask M1 is elastically deformed, and the upper mask M1 and the lower mask M2 are in surface contact with each other, thereby forming a space filled with the cream solder K as in the first embodiment.

  When this filling operation is completed, the one-side squeegee 50 rises to a predetermined position (step S40, (4) in FIG. 8). As a result, the upper mask M1 naturally returns to its original shape before elastic deformation. That is, unlike the first embodiment, the upper mask M1 is moved from the lower mask M2 to the upper mask M1 even though the configuration (the motor MO and the ball screw N in the first embodiment) for raising and lowering the upper mask M1 is not provided. To separate.

  Next, a motor (not shown) rotates, and as a result, the substrate stage 40 and the printed circuit board P placed thereon are lowered as shown in FIG. 9D (step S42 in FIG. 8). 5)). That is, the lower mask M2 is separated from the surface of the printed circuit board P. Then, the printed circuit board P on which the cream solder K is printed is carried out (step S44).

  As described above, according to the screen printing apparatus 10 ′ of the present embodiment, screen printing in which the opening Mb penetrating in the thickness direction passes through the upper mask M <b> 1 and the lower mask M <b> 2 overlapped at a constant interval. A mask M is formed (see FIGS. 7 and 9A). Then, a cream solder K is filled in a space defined by the surface of the printed circuit board P on which the mask M for screen printing is overlapped and the opening Mb (see FIG. 9B). The mask M1 is separated (see FIG. 9C), and then the lower mask M2 is separated.

  That is, since the masks M1 and M2 are sequentially separated, the contact area between the cream solder K and the masks M1 and M2 (the inner walls of the openings M1b and M2b penetrating through the masks) is smaller than that in the conventional case. Therefore, the cream solder can be easily removed during mask separation. That is, stable screen printing is possible regardless of the size of the opening Mb penetrating the mask M (regardless of the aspect ratio).

Moreover, according to the screen printing apparatus 10 ′ of the present embodiment, unlike the screen printing apparatus 10 of the first embodiment, the upper mask M1 naturally returns to its original shape before elastic deformation, thereby lower mask. The upper mask M1 is separated from M2 (see FIGS. 9B and 9C). A configuration for raising and lowering the upper mask M1 (the motor MO and the ball screw N in the first embodiment) is not necessary.
(Modification)
Next, a modified example will be described.

  For example, as shown in FIGS. 10A and 10B, the end of the opening M2b of the lower mask M2 in each of the above embodiments may be chamfered.

  In this way, it is possible to prevent the end of the opening M2b from coming into contact with the cream solder K and scraping it off when the lower mask M2 is separated.

  For example, as shown in FIGS. 11A and 11B, the size of the opening M1b of the upper mask M1 in each of the above embodiments may be made smaller than the size of the opening M2b of the lower mask M2.

  In this way, it is possible to prevent the end portion of the opening M1b from coming into contact with the cream solder K and scraping it off when the upper mask M1 is separated.

  Further, for example, the upper mask M1 in each of the above embodiments may be a metal mask (a mask made of a material with higher rigidity), and the lower mask M2 may be a resin mask (a mask made of a material with lower rigidity). Good.

  If the lower mask M2 is made of a mask made of a material having lower rigidity, even if the printed circuit board surface is uneven or warped, the ratio of contact with the surface increases (see FIG. 12A). ), It is possible to prevent the solder K from bleeding from between the printed circuit board surface and the mask as in the prior art (see FIG. 12B). In addition, since the upper mask M1 is a mask made of a material having higher rigidity, the wear can be reduced and printing can be stably performed for a long period of time.

  Further, for example, as shown in FIGS. 13A and 13B, the upper mask M1 in each of the above embodiments may be thicker than the lower mask M2.

  Since the upper mask M1 is easier to be removed even if the aspect ratio is larger, this makes it possible to print more stably even if the aspect ratio of the lower mask M2 is reduced.

  Further, for example, a structure 60 for cleaning the bottom surface of the upper mask M1 and the surface of the lower mask M2 in each of the above embodiments may be provided.

  For example, as shown in FIGS. 14 to 16, two rails 61 are arranged at a fixed interval, and the end portions of the rod-shaped rubber bodies 62 are connected to the rails 61 via wheels or the like, respectively. Thus, the rubber body 62 is configured to be capable of reciprocating linear movement along the rail.

  When cleaning becomes necessary, for example, the upper mask M1 is raised and a rod-shaped rubber body 62 is disposed between the upper mask M1 and the lower mask M2, and this rubber body 62 is indicated by an arrow in FIG. By moving in the direction, the bottom surface of the upper mask M1 and the surface of the lower mask M2 (flux and the like attached thereto) are cleaned.

  Since it is desirable for cleaning that the rubber body 62 and each mask are in line contact with each other, the rubber body 62 may have a circular cross section, an elliptical diameter, or a large number of squares or the like. It may be a rectangular shape (line contact is made at a corner portion of a polygon) or may be a circular cross section having two portions having relatively acute angles as shown in FIG.

  In this way, it is not necessary to stop the machine and clean each of the masks M1, M2, so that the production efficiency can be improved.

  In the screen printing apparatus 10 ′ of the second embodiment, the upper mask M1 is fixed to the mask support frame 30, and has a configuration (motor MO, ball screw N, etc.) for raising and lowering the upper mask M1. Although not described, the present invention is not limited to this.

  For example, the same printing operation as that of the screen printing apparatus 10 'of the second embodiment can be performed by the screen printing apparatus of the first embodiment by creating the same state as the screen printing apparatus 10 of the second embodiment. Is possible.

  Specifically, before the printing operation shown in FIG. 8 is started, the upper mask M1 is lowered, and the upper mask M1 and the lower mask M2 are spaced apart by a fixed interval (for example, an interval equivalent to the thickness of the upper mask M1). Thus, a screen printing mask M is formed through which a plurality of openings (openings formed by the openings M1b and M2b) pass through in the thickness direction. Thereby, the same state as the screen printing apparatus 10 of 2nd Embodiment is produced. The subsequent printing operation is the same as in FIG.

  In this way, control for separating the upper mask M1 becomes unnecessary.

  The above embodiment is merely an example in all respects. The present invention is not construed as being limited to these descriptions. The present invention can be implemented in various other forms without departing from the spirit or main features thereof.

It is a figure for demonstrating the main structures of the screen printing apparatus which is 1st Embodiment of this invention. It is a top view of an upper mask. It is a top view of a lower mask. It is a top view of the state where the up-and-down mask was piled up. It is a flowchart for demonstrating printing operation of the screen printing apparatus which is 1st Embodiment of this invention. It is a figure for demonstrating printing operation of the screen printing apparatus which is 1st Embodiment of this invention. It is a figure for demonstrating the main structures of the screen printing apparatus which is 2nd Embodiment of this invention. It is a flowchart for demonstrating printing operation of the screen printing apparatus which is 2nd Embodiment of this invention. It is a figure for demonstrating printing operation of the screen printing apparatus which is 2nd Embodiment of this invention. It is a figure for demonstrating the modification of each embodiment. It is a figure for demonstrating the modification of each embodiment. (A) is a figure for demonstrating the modification of each embodiment. (B) is a figure for demonstrating the prior art example of the modification of each embodiment. It is a figure for demonstrating the modification of each embodiment. It is a figure for demonstrating the modification of each embodiment. It is a figure for demonstrating the modification of each embodiment. It is a figure for demonstrating the modification of each embodiment. It is a figure for demonstrating the prior art of the screen printing apparatus which is embodiment of this invention. It is a figure for demonstrating the problem of the prior art of the screen printing apparatus which is embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Screen printer, 20 ... Mask support frame, 21 ... Upper end plate, 22 ... Screw hole, 30 ... Mask support frame, 31 ... Upper end plate, 32 ... Through-hole, 40 ... Substrate stage, 50 ... Squeegee, 60 ... Cleaning Mechanism, 61 ... Rail, 62 ... Rubber body, B ... Chain belt, M ... Mask, M1 ... Upper mask, M1a ... Frame, M1b ... Opening, M2 ... Lower mask, M2a ... Frame, M2b ... Opening, MO ... Motor , P ... printed circuit board, M '... mask (conventional mask)

Claims (15)

At least two masks,
Mask constituting means for constituting a mask for screen printing in which an opening penetrates in the thickness direction by overlapping each mask,
A screen printing apparatus comprising: Means for overlapping the screen printing mask and the printing surface;
Filling means for filling a printing material in a space defined by the printing surface on which the mask for screen printing is overlaid and the opening;
Separating means for sequentially separating the masks after the filling operation by the filling means;
The screen printing apparatus according to claim 1, further comprising: A first mask superimposed on the printing surface;
A second mask overlaid on the first mask;
A mask forming means for forming a mask for screen printing in which an opening penetrates in the thickness direction by overlapping the first mask and the second mask;
A screen printing apparatus comprising: Means for overlapping the screen printing mask and the printing surface;
Filling means for filling a printing material in a space defined by the printing surface on which the mask for screen printing is overlaid and the opening;
First separation means for separating the second mask from the first mask after the filling operation by the filling means;
Second separation means for separating the first mask from the printing surface after the separation operation by the first separation means;
The screen printing apparatus according to claim 3, further comprising:   5. The screen printing apparatus according to claim 3, wherein the mask forming unit overlaps the first mask and the second mask so as to be in surface contact with each other.   5. The screen printing apparatus according to claim 3, wherein the mask forming unit overlaps the first mask and the second mask at a predetermined interval.   The screen printing apparatus according to claim 3, wherein an end portion of the opening penetrating the first mask is chamfered.   The screen printing apparatus according to claim 3, wherein an opening penetrating the second mask is smaller than an opening penetrating the first mask.   The screen printing apparatus according to claim 3, wherein the first mask is made of a material having lower rigidity than the second mask.   The screen printing apparatus according to claim 9, wherein the second mask is made of a metal material, and the first mask is made of an elastic material, a synthetic resin, or a rubber material.   The screen printing apparatus according to claim 3, wherein the first mask and the second mask have different thicknesses.   The screen printing apparatus according to claim 11, wherein a thickness of the second mask is larger than a thickness of the first mask.   The screen printing apparatus according to claim 3, further comprising means for cleaning a contact surface between the first mask and the second mask.   The screen printing apparatus according to claim 1, wherein the printing material is cream solder.   A screen printing mask with an opening penetrating in the thickness direction is formed by overlapping at least two masks, and a printing material is filled in a space defined by the printing surface on which the screen printing mask is to be overlaid and the opening. Then, after the filling operation, the masks are sequentially separated.

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