JP2000218763A - Printing squeegee - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the side leakage of ink and enable a continuos printing to be efficiently performed when a protecting layer for coating and insulating an integrated circuit element or the like to be mounted on a printed wiring board is formed by printing. SOLUTION: A squeegee 5 is formed entirely into a cylindrical shape and an inner space part serving as a resin filled part 5a, with a diametral size in a width direction orthogonal with the sliding direction being of a longer axis than the open width of an open pattern part 8 corresponding to the printing region 14 of a mater 11 to be printed. A resin 7 packed in the squeegee 5 is printed by forcing it out of the open pattern part 8 onto the printing region 14 by sliding the squeegee 5 over the main face under pressure. The printing mask 4 is of such a construction that its thickness becomes gradually smaller toward the moving direction of the squeegee 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a protective layer made of an insulating resin such as an epoxy resin for sealing an integrated circuit element or the like mounted on a predetermined area of a printed wiring board by screen printing or the like. The present invention relates to a printing squeegee suitable for use in printing.

[0002]

2. Description of the Related Art For example, in an integrated circuit device 110, as shown in FIGS.
A semiconductor element or an integrated circuit element (hereinafter, collectively referred to as an integrated circuit element) 112 is mounted directly on the semiconductor chip 1 and bonded to each land 114 by a gold wire 113. In the integrated circuit device 110, in order to maintain the insulating property of the mounted integrated circuit element 112, the gold wire 113, or the land portions 114 and to provide mechanical protection, these portions are formed of an insulating resin layer 115 such as an epoxy resin. To be sealed.

In such an integrated circuit device 110, the above-described insulating resin layer 115 such as an epoxy resin is printed on each predetermined portion by a screen printing device 100 using a printing mask 101 having a predetermined opening pattern portion 104 in general. . That is, the screen printing apparatus 100
As shown in FIG. 5 and FIG. 6, printing is performed in such a manner that a circuit element 112 such as a semiconductor element or an integrated circuit element is positioned and mounted on a printed circuit board 111 formed by bonding a land portion 114 with a gold wire 113. Mask 101 is provided. Also, the screen printing apparatus 100
Is provided with a printing squeegee 103 that slidably moves on the main surface of the printing mask 101 under pressure and extrudes an insulating resin ink 102 such as an epoxy resin filled on the printing mask 101.

[0004] The printing mask 101 is formed of, for example, a thin metal plate of stainless steel or the like, and has an appropriate opening pattern portion 104 formed corresponding to a printing location. The opening pattern section 104 is, specifically, a printed wiring board 111.
Gold wire 113 and each land 1 including the element mounting area of
14 is formed by an opening corresponding to a print area 116 that is sufficient to cover 14. The printing squeegee 103 is formed into a spatula shape using natural rubber, silicone rubber, or the like having elasticity, ink solvent resistance, abrasion resistance, and the like. The printing squeegee 103 includes a printing mask 101.
Has a width substantially equal to the width of the main surface.

[0005] In the screen printing apparatus 100 configured as described above, the printing mask 101 is positioned and mounted on the printed wiring board 111 such that the opening pattern portion 104 thereof corresponds to the printing area 116. In this state, the screen printing apparatus 100 sets the printing mask 101
Is filled with an insulating resin ink 102. The screen printing apparatus 100 extrudes the insulating resin ink 102 from the opening pattern portion 104 by slidably moving the printing squeegee 103 on the main surface of the printing mask 101 in a pressurized state as shown by the arrow in FIG. Printing is performed on the print area 116 of the printed wiring board 111.

After the printing mask 101 of the screen printing apparatus 100 is removed from the printed wiring board 111, a drying process for drying and curing the insulating resin ink 102 is performed. Therefore, the printed circuit board 111 is provided with the integrated circuit element 112, the gold wire 113, or the land portions 114 mounted thereon by the protective layer 115 formed by curing the insulating resin ink 102 printed on the print area 116. The integrated circuit device 110 is completed. In the integrated circuit device 110, insulation protection or mechanical protection of the integrated circuit element 112 and the like is achieved by the protective layer 115.

[0007]

SUMMARY OF THE INVENTION Screen printing apparatus 1
00, as described above, the printing squeegee 103
Slides on the main surface of the printing mask 101 in a pressurized state and pushes out the insulating resin ink 102 from the opening pattern portion 104 to print the protective layer 115. In the screen printing apparatus 100, when printing the protection layer 115 over a wider area of the printed wiring board 111, more insulating resin ink 102 is supplied onto the main surface of the printing mask 101. Further, in the screen printing apparatus 100, even when printing is performed on a large number of the printed wiring boards 111, more insulating resin ink 102 is supplied onto the main surface of the printing mask 101.

In the screen printing apparatus 100, as described above, when the printing squeegee 103 is slid in a state where a large amount of the insulating resin ink 102 is supplied onto the printing mask 101, as shown in FIG. The printing resin squeegee 1 is a part of the insulating resin ink 102.
A so-called lateral leakage phenomenon occurs, which spreads and overflows toward both sides 103a and 103b of the liquid crystal 03 and leaks backward. The screen printing apparatus 100 strips and discards the insulating resin inks 102a and 102b leaked rearward by a blade or the like (not shown) in a later process. Therefore, the screen printing apparatus 100 has a problem in that the supplied insulating resin ink 102 is not effectively used for printing the protective layer 115, so that the efficiency is deteriorated. Further, in the screen printing apparatus 100, since it is difficult to supply a large amount of the insulating resin ink 102,
There has been a problem that the number of times of supplying the insulating resin ink 102 increases and printing efficiency deteriorates.

Incidentally, the screen printing apparatus 100
Generally, a printing squeegee 10 is
3 is positioned on one side of the printing mask 101.
An insulating resin ink 102 is supplied thereon. When the printing squeegee 103 is slid from this state, the screen printing apparatus 100 extrudes the insulating resin ink 102 from the opening pattern portion 104 at the front end thereof, and prints the protective layer 115. The screen printing apparatus 100 is moved up so as to be separated from the printing mask 4 while the printing squeegee 103 is slid to the multi-end side of the printing mask 101, and the blade is moved to the printing mask 10.
The lowering operation is performed so as to press 1.

In the screen printing apparatus 100, the printing squeegee 103 and the blade are returned to the initial position in this state. At the time of this return path, the surplus insulating resin ink is removed from the main surface of the printing mask 101 by the blade. The scraping of 102 is performed. Screen printing device 100
However, there is a problem that the efficiency of the printing is poor because the protection layer 116 is printed on the printing mask 101 by the sliding operation of the printing squeegee 103 in one direction.

Therefore, the present invention is suitable for use in, for example, forming a protective layer for insulatingly covering an integrated circuit element or the like mounted on a printed wiring board by printing, and is suitable for a case where a large amount of ink is supplied. The aim is to provide a printing squeegee that suppresses the occurrence of lateral leakage of ink so that it can be used effectively, enables efficient continuous printing, and streamlines the printing process. is there.

[0012]

According to the present invention, there is provided a printing squeegee for achieving the above object, in which a main surface of a printing mask having an opening pattern corresponding to a printing area of a printing medium is pressed. , The ink supplied on the printing mask is extruded into the opening pattern portion and printed on the printing area. The printing squeegee has an overall cylindrical shape in which the diameter dimension in the width direction orthogonal to the sliding direction is longer than the opening width dimension of the opening pattern section, and the internal space is configured as an ink-filled space. Be done.

According to the printing squeegee according to the present invention having the above-described structure, the sliding operation is performed under a pressurized state on the main surface of the printing mask in a state where the ink filling space is filled with a large amount of ink. Is done. The printing squeegee fills the closed ink filling space with ink to suppress the occurrence of lateral leakage of ink when sliding, and to reduce the amount of ink used to achieve efficient use. Reduce. In addition, the printing squeegee enables printing on the printing area of the printing medium in the forward path and the return path, and further improves the printing efficiency by securing the ink filling amount.

The printing squeegee according to the present invention comprises:
A concave space portion is formed at the front end portion in the sliding direction of the ink extruding portion by projecting both sides in the sliding direction with respect to the center portion in the width direction. In the printing squeegee, the concave space portion is configured as an ink filling space portion for filling ink.

According to the printing squeegee according to the present invention configured as above, the printing mask is slid in a pressurized state on the main surface of the printing mask in a state where the ink is filled in the ink filling space. . The printing squeegee suppresses the lateral leakage of ink at the projecting portions on both sides during the sliding operation, thereby achieving efficient use and reducing the amount of ink used.

Further, in the printing squeegee according to the present invention, by forming a protective layer with an insulating resin ink for sealing the integrated circuit element and the like, a more inexpensive integrated circuit device can be manufactured efficiently.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a printing squeegee according to the present invention will be described below in detail with reference to the drawings. Printing squeegee 5 shown as an embodiment
Is used in the screen printing apparatus 1 provided in the manufacturing process of the integrated circuit device 10 in the same manner as in the conventional example described above. The screen printing apparatus 1 prints and forms a protective layer 13 that is mounted on a printed wiring board 11, seals the integrated circuit element body 12, maintains its insulating properties, and provides mechanical protection.
The screen printing apparatus 1 is capable of printing a printing layer with a relatively large thickness, being applicable to both hard and soft printing media, being free to select ink, and having a relatively simple apparatus. It has various features such as the above, and is applied not only to the manufacturing process of the integrated circuit device 10 but also to various fields.

As shown in FIGS. 1 and 2, the screen printing apparatus 1 includes a base 2, a frame member 3 attached to the base 2 so as to be openable and closable, and a frame member 3 that can be exchanged with the frame member 3. It is composed of members such as the attached printing mask 4 (plate material), printing squeegee 5 and blade 6. The screen printing apparatus 1 places the printed wiring board 11 which is a printing object on the base 2 in a state where the printed wiring board 11 is positioned, and fills the printed wiring board 11 onto the printing mask 4 by the printing squeegee 5. The insulating resin ink 7 is supplied to a predetermined print area 14 to print the protective layer 13.

The base 2 positions and positions the printed wiring board 11 and holds the printed wiring board 11 in a horizontal state so as to be firmly placed and held. The printing mask 4 has a thickness slightly larger than the height of the integrated circuit element body 12 mounted on the printed wiring board 11,
In other words, the protective layer 13 formed on the printed wiring board 11
It is formed of a thin metal plate such as stainless steel having a thickness slightly larger than the thickness of the metal. Printing mask 4
The outer peripheral portion is firmly fixed to the inner peripheral portion of the frame member 3.

As shown in FIGS. 1 and 2, the printing mask 4 is formed with a rectangular opening pattern portion 8 corresponding to the printing area 14 of the printed wiring board 11. Specifically, as shown in FIG. 1, the opening pattern section 8 includes a printing area sufficient to cover the gold wire 17 and each land section 16 including an area where the integrated circuit element body 12 of the printed wiring board 11 is mounted. 14.
The opening pattern portion 8 has a sufficient opening size so that the gold wire 17 does not contact the inner peripheral wall.

The thickness of the printing mask 4 is gradually reduced from the starting end 4a to the end 4b in the sliding direction of the printing squeegee 5, which will be described later, as shown in FIG. The taper T is provided.
In other words, the printing mask 4 is configured such that the depth of the opening pattern portion 8 becomes gradually smaller from the starting end side 4a toward the ending side 4b with respect to the sliding direction of the squeegee 5. The printing squeegee 5 is formed of an elastic material having elasticity, ink solvent resistance, abrasion resistance, and the like, and having a hardness of about 60 to 80 Shore, such as natural rubber, nitrile, silicon, or urethane rubber. It becomes. As shown in FIGS. 1 and 2, the printing squeegee 5 has a diameter in the width direction orthogonal to the sliding direction.
The opening pattern portion 8 is formed to have an overall cylindrical shape whose axis is longer than the opening width dimension. The printing squeegee 5
Although not shown, the inner space portion is formed as an ink filling space portion 5a with an upper end portion opened, and the lower end opening of the ink filling space portion 5a constitutes an extruded portion 5b of the insulating resin ink 7.

The printing squeegee 5 is filled with the insulating resin ink 7 in the ink filling space 5a. The printing squeegee 5 slides from the left side to the right side as shown by the arrow in FIG. 2 manually or by a driving mechanism (not shown) in a state where the printing squeegee 5 is pressed against the main surface of the printing mask 4 in the outward path step as described later. It is operated. In the printing squeegee 5, for example, during this sliding operation, the insulating resin ink 7 filled in the ink filling space 5 a is pushed out from the lower extruding portion 5 b onto the main surface of the printing mask 4 by an extruding mechanism (not shown). It is composed of

The printing squeegee 5 slides on the main surface of the printing mask 4 to push the insulating resin ink 7 into the opening pattern portion 8 from the extruded portion 5b when it is positioned at the opening pattern portion 8. Fill. The insulating resin ink 7 is thereby extruded onto the print area 14 of the printed wiring board 11 and printed. The printing squeegee 5 performs an operation of returning to the initial position in a state of being slightly raised with respect to the main surface of the printing mask 4 in the return path process.

The screen printing apparatus 1 may be configured to print the protective layer 13 on different printed circuit boards 11 in the reciprocating operation of the printing squeegee 5. In this case, in the screen printing apparatus 1, the printing mask 4 is formed with a substantially uniform thickness as a whole, and the printing squeegee 5 slides on the main surface of the printing mask 4 in a reciprocating operation in a pressurized state. .

The blade 6 is provided with the printing squeegee 5 described above.
And is located on the front side in the sliding direction. The blade 6 moves ahead of the printing squeegee 5 in the outward path process, as described later, so that the insulating resin ink 7 supplied on the main surface of the printing mask 4 is moved.
Has the effect of smoothing out. Further, the blade 6 returns to the initial position while scraping excess insulating resin ink 7 from the main surface of the printing mask 4 in the return path step.

In the screen printing device 1,
As described above, when the printing squeegee 5 slides on the main surface of the printing mask 4 in a reciprocating operation in a pressurized state to print the protective layer 13 on a different printed wiring board 11, the blade 6 is used. Is unnecessary. In the screen printing apparatus 1, the lower end portion of the outer peripheral wall of the printing squeegee 5 performs the same operation as the blade 6.

The insulating resin ink 7 is made of, for example, an epoxy resin which is liquefied by mixing a volatile solvent and has electrical insulating properties, adhesive properties or mechanical strength properties.
The insulating resin ink 7 does not flow out of the ink filling space 5 a of the printing squeegee 5 when supplied on the main surface of the printing mask 4. As described above, the insulating resin ink 7 is applied to the printing area of the printed wiring board 11 from the extruded portion 5b via the opening pattern portion 8 by the sliding operation of the printing squeegee 5 on the main surface of the printing mask 4 while being pressed. 14 has sufficient viscosity to be filled.

Therefore, it is preferable to use the insulating resin ink 7 having a viscosity of about 1,000 to 5,000 centipoise. Note that, for the insulating resin ink 7, for example, an ultraviolet-curable synthetic resin adhesive may be used in consideration of the efficiency of the drying process.

Although the printed wiring board 11 is not described in detail, an appropriate circuit pattern 15 is formed by removing a part of the copper foil on the copper-clad insulating substrate by, for example, lithographic etching. It becomes. As shown in FIG. 1, the printed wiring board 11 has lands 16 integrally formed at the end of each circuit pattern 15 and an integrated circuit element body 12 in a region surrounded by the lands 16. Has been implemented. Printed wiring board 11
The integrated circuit element body 12 and the land 16 mounted by, for example, a bonding apparatus are bonded by gold wires 17.

In the screen printing apparatus 1 configured as described above, the printed circuit board 11 is mounted on the base 2 with the frame member 3 to which the printing mask 4 is attached opened to the base 2. It is positioned and placed. In the screen printing apparatus 1, when the frame member 3 is closed with respect to the base 2, the printing mask 4 is positioned so that the opening pattern portion 8 thereof corresponds to the printing area 14 of the printed wiring board 11. In this state, the insulating resin ink 7 is filled in the ink filling space 5a of the printing squeegee 5 in the screen printing apparatus 1. In the screen printing apparatus 1, a sufficient amount of the insulating resin ink 7 sufficient to print the protective layer 13 on a large number of printed wiring boards 11 is filled in the ink filling space 5a.

The screen printing apparatus 1 includes a printing mask 4
The printing squeegee 5 is pressed against
The printing squeegee 5 is slid from left to right as shown by the arrow in FIG. In the screen printing apparatus 1, the blade 6 is set at a position before the printing squeegee 5 in the sliding direction with the blade 6 slightly suspended from the printing mask 4. In the screen printing device 1, the insulating resin ink 7 supplied from the extruding portion 5 b of the printing squeegee 5 is extruded into the opening pattern portion 8 of the printing mask 4, and the printing on the printing area 14 of the printed wiring board 11 is performed. Will be

In the screen printing apparatus 1, when the printing squeegee 5 is moved from the start end 4a to the end 4b of the printing mask 4, the operation is temporarily stopped and the printing squeegee 5 is printed. Is moved up so as to be separated from the main surface of the mask 4 for use. The screen printing apparatus 1 is moved down so that the blade 6 presses the printing mask 4. In this state, the screen squeegee 5 and the blade 6 return to the initial position. The blade 6 scrapes the surplus insulating resin ink 7 from the main surface of the printing mask 4 during the returning movement.

Since the printing mask 4 has a thickness slightly larger than the height of the integrated circuit element body 12 as described above, the screen printing apparatus 1 integrates with the insulating resin ink 7 extruded into the opening pattern portion 8. Circuit element body 1
2 and the gold wire 17.

The screen printing apparatus 1 includes the printing squeegee 5 formed in a substantially elliptical cylindrical shape as described above, and its internal space is configured as an ink filling space 5a.
Therefore, the screen printing apparatus 1 can maintain the insulating resin ink 7 even when the printing squeegee 5 is moved on the main surface of the printing mask 4 from the start end 4a to the end 4b in a pressurized state. Is suppressed from leaking to the rear side. In the screen printing apparatus 1, the insulating resin ink 7 is efficiently filled in the opening pattern portions 8, so that the usage amount of the insulating resin ink 7 is significantly reduced.

Since the screen printing apparatus 1 is configured to fill a large amount of the insulating resin ink 7 into the ink filling space 5a of the printing squeegee 5, the insulating resin ink 7 is frequently refilled. Printed wiring board 1
1 can be printed with the protective layer 13. Therefore, in the screen printing device 1, the number of times of refilling the insulating resin ink 7 is reduced, and the process is rationalized.

As described above, the screen printing apparatus 1 is configured such that the opening pattern portion 8 gradually becomes shallower from the starting end 4a toward the end 4b with respect to the sliding direction of the printing squeegee 5. The used printing mask 4 is used. Therefore, the filling amount of the insulating resin ink 7 in the opening pattern portion 8 is larger on the start end side 4a than on the end side 4b. In the screen printing apparatus 1, the surface layer portion of the start end 4 a is changed to the end 4 b by the pulling phenomenon of the insulating resin ink 7 by the printing squeegee 5.
The insulating resin ink 7 is made to have a uniform thickness as a whole in the opening pattern portion 8 by being pulled and supplemented. The screen printing apparatus 1 insulates the printing area 14 in a state where the printing squeegee 5 and the blade 6 return to the initial position and the operations are stopped, and the frame member 3 is rotated with respect to the base 2. An operation of taking out the printed wiring board 11 on which the resin ink 7 has been printed is performed. The printed wiring board 11 is subjected to a drying process for drying and curing the insulating resin ink 7 in the next step. The printed wiring board 11
As shown in FIG. 3, an integrated circuit device in which the element body 12, the gold wire 17 and the land portions 16 mounted by the protective layer 13 formed by curing the insulating resin ink 7 printed on the print area 14 is sealed. Complete 10

In the integrated circuit device 10, the insulating layer or the mechanical protection of the integrated circuit element body 12 and the like is achieved by the protective layer 13. Further, in the integrated circuit device 10, as shown in FIG. 3, the protective layer 13 has a uniform thickness and a flat surface. The integrated circuit device 10 is configured such that the insulating resin ink 7 is cured in a uniform state in the drying step, so that the gold wire 17
The occurrence of inconveniences, such as breakage, is suppressed, the yield is improved, and the device is manufactured with high accuracy. Integrated circuit device 10
In some cases, a second circuit layer or the like may be further formed on the protective layer 13 described above, or a printing process such as a specification may be performed. A post-process of accuracy is performed. In addition, the present invention
It is needless to say that the present invention is not limited to the printing squeegee 5 of the screen printing apparatus 1 in which the protective layer 13 for enclosing the integrated circuit element body 12 is provided in the manufacturing process of the integrated circuit device 10 described above. The screen printing apparatus 1 includes, for example, a protective layer 13 that covers the entire surface of the printed wiring board 11.
May be formed by printing, or may be used to print a solder paste on a predetermined portion of the printed wiring board 11.

The above-described printing squeegee 5 is formed in a cylindrical shape as a whole, and its internal space is formed as an ink-filled space portion 5a. However, it is a matter of course that the present invention is not limited to this configuration. The printing squeegee 20 shown in FIG. 4 as the second embodiment of the present invention has a basic shape formed like a spatula like the conventional printing squeegee 103. Ink leakage portions 2 at both ends of the front end portion 21 in the sliding direction,
It is characterized in that the 2a and 22b (22) are integrally formed.

That is, the printing squeegee 20 also has an elastic property, an ink solvent resistance, an abrasion resistance and the like, and an elastic material having a hardness of about 60 to 80 Shore, such as natural rubber, nitrile, silicon or urethane rubber. Formed as a material. The insulating resin ink 7 is supplied to the printing squeegee 20 at the front end portion 21 in the sliding direction as shown in FIG. The ink leakage portions 22 a and 22 b are wedge-shaped protrusions integrally protruding from both end portions in the width direction of the front end portion 21 in the sliding direction, respectively, and slide in the front end portion 21 of the printing squeegee 20 in the sliding direction. A concave space portion 23 is formed.

The printing squeegee 20 is formed by supplying the insulating resin ink 7 into the recessed space 23, thereby forming the recessed space 23 as an ink filling space. Of course, the printing squeegee 20 is formed such that the width of the concave space 23 is slightly larger than the opening of the opening pattern 8 of the printing mask 4.

The printing squeegee 2 configured as described above
The insulating resin ink 7 is supplied to the recessed space 23 in a state where the printed wiring board 11 is positioned and mounted on the base 2 to the screen printing apparatus 1 provided with the base plate 2. In the screen printing apparatus 1, the printing mask 4 is positioned so that the opening pattern portions 8 thereof correspond to the printing areas 14 of the printed wiring board 11. In this state, the printing squeegee 20 is pressed against the printing mask 4 against the screen printing apparatus 1, and the printing squeegee 20 is manually or by a drive mechanism (not shown) so that the printing squeegee 20 is moved from left to right as shown by the arrow in FIG. 4. The sliding operation is performed toward.

The printing squeegee 20 slides on the main surface of the printing mask 4 in a pressurized state. When the printing squeegee 20 is located at the position corresponding to the opening pattern portion 8, the insulating resin ink 7 is extruded and filled therein. The insulating resin ink 7 is thereby extruded onto the print area 14 of the printed wiring board 11 and printed. Note that the printing squeegee 20 returns to the initial position in the return path process while slightly rising from the main surface of the printing mask 4.

In the screen printing apparatus 1, when the printing squeegee 20 is moved on the main surface of the printing mask 4 from the start end 4a to the end 4b in a pressurized state, the insulating resin ink is used. 7 gradually spreads to both sides. The screen printing apparatus 1 includes the printing squeegee 20 having the ink filling space 23 formed by integrally forming the ink leakage portions 22a and 22b at both ends in the sliding direction as described above. Become.

Therefore, in the screen printing apparatus 1, the insulating resin ink 7 spread to both sides is
By being stopped by a and 22b, the occurrence of a phenomenon that the printing squeegee 20 leaks rearward from the side end of the printing squeegee 20 is suppressed. In the screen printing apparatus 1, the insulating resin ink 7 is efficiently filled in the opening pattern portions 8, so that the usage amount of the insulating resin ink 7 is significantly reduced.

The shape of the printing squeegee 20 is not limited to the above-described shape. In the printing squeegee 5 of the above-described first embodiment, the outer peripheral wall at the front end portion in the sliding direction may be deleted. May be formed in the shape of an entire arc.

[0046]

As described above in detail, according to the printing squeegee according to the present invention, the diameter in the width direction orthogonal to the sliding direction is longer than the opening width of the opening pattern portion. The overall space is formed as an ink-filled space while being formed to have a cylindrical shape, so that ink leakage during sliding operation is suppressed and efficient use is achieved. As a result, printing efficiency is greatly improved by reducing the amount of ink used, and by reducing the number of ink replenishments and enabling continuous printing.

According to the printing squeegee of the present invention, the front end portion of the ink extruding portion in the sliding direction has both sides projecting toward the sliding direction with respect to the center portion in the width direction. By filling the concave space formed by the ink with the ink, the amount of ink used is reduced by suppressing the occurrence of lateral leakage of the ink during the sliding operation so as to achieve efficient use. Printing efficiency is greatly improved by reducing the number of ink replenishments and enabling continuous printing.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an essential part for explaining a protective layer forming step by a screen printing device provided in a manufacturing process of an integrated circuit device provided with a printing squeegee shown as an embodiment of the present invention.

FIG. 2 is a plan view of a main part of the screen printing apparatus.

FIG. 3 is a longitudinal sectional view of an integrated circuit device on which a protective layer is formed by the screen printing device.

FIG. 4 is a plan view of a main part of a screen printing apparatus provided with another printing squeegee.

FIG. 5 is a longitudinal sectional view of an essential part for explaining a protective layer forming step by a screen printing apparatus provided in a manufacturing step of an integrated circuit device having a conventional printing mask.

FIG. 6 is a plan view of a main part of the screen printing apparatus.

FIG. 7 is an explanatory diagram of a lateral leakage phenomenon of the insulating resin ink in the screen printing apparatus.

[Description of Signs] 1 Screen printing device 2 Base 3 Frame member 4 Printing mask (plate member) 5 Printing squeegee 5a Ink filling space 5b Ink extruding part 6 Plaid 7 Insulating resin ink (ink) 8 Opening pattern part 10 Integrated circuit device 11 Printed wiring board (substrate to be printed) 12 Integrated circuit element body 13 Protective layer 14 Print area 15 Circuit pattern 16 Land portion 17 Gold wire 20 Printing squeegee 21 Front end portion 22 Ink leakage portion

Claims (3)

[Claims] An ink supplied on a printing mask by sliding under a pressurized state on a main surface of a printing mask on which an opening pattern portion corresponding to a printing region of a printing medium is formed. In the printing squeegee for extruding into the opening pattern portion and printing on the printing area, the entire cylindrical shape whose diameter in the width direction orthogonal to the sliding direction is longer than the opening width of the opening pattern portion. A squeegee for printing, which is formed in such a manner that the internal space is formed as an ink-filled space so as to suppress lateral leakage of ink. 2. The ink supplied on the printing mask by sliding in a pressurized state on a main surface of the printing mask on which an opening pattern portion corresponding to a printing region of a printing medium is formed. In the printing squeegee for extruding the ink into the opening pattern portion and printing on the printing area, the front end portion of the ink extruding portion in the sliding direction has two sides in the sliding direction with respect to the center in the width direction. The recessed space portion is configured by projecting to the side,
A printing squeegee characterized in that the concave space portion is configured as an ink filling space portion so as to suppress lateral leakage of ink. 3. The printing medium is a printed wiring board having an integrated circuit element or the like mounted on a printing area, and an insulating resin ink such as an epoxy resin supplied on the printing mask is filled in the opening pattern portion. 2. A protective layer enclosing the integrated circuit element or the like is formed by printing by extruding and printing on the printing area.
Or a printing squeegee according to claim 2.