JP2003276354A - Screen printing plate and screen printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screen printing plate which can well print a cream solder or the like without fault even when a ruggedness of a mounted previously attached component exists on a circuit board. <P>SOLUTION: The screen printing plate 210 comprises an integral case shape constituted of a metal thin plate or the like such as a stainless steel or the like. The plate 210 further comprises a substantially flat printing surface 211 having a printing pattern suitably formed at a bottom thereof. Further, a side face 212 is stood from the overall peripheral edge of the printing surface 211, and entirely constituted in a cylindrical state. An edge 213 opened so as to be bent to an outside is provided at an upper end of the face 212. The plate 210 is integrally constituted of plate-like materials having the same thickness of the surface 211 and the face 212. The edge 213 is integrally constituted of plate-like materials having the same thickness as well. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen printing plate and a screen printing apparatus, and more particularly to a structure of a printing apparatus suitable for printing cream solder on a circuit board.

[0002]

2. Description of the Related Art Generally, as a screen printing apparatus for printing cream solder on a circuit board or the like, as shown in FIG. 6, a printing surface slab 111 having a printing pattern formed of a stainless thin plate or the like is used as a printing frame. It is known to use the screen printing plate 110 fixed to 112. When this screen printing plate 110 is used, the cream solder 121 is placed on the printing surface plate 111,
1 is brought into close contact with the surface of an object to be printed, for example, the circuit board 101, and the squeegee 120 is slid on the printing surface plate 111 so that the cream solder 121 is pressed against the printing surface plate 111. The cream solder 121 is printed on the circuit board 101 through the holes (not shown).

Here, there are cases where electronic components (preliminary components) have already been mounted on the circuit board 101 in the previous process. When such preliminary components are present,
When the circuit board 101 is a flexible board (flexible board), the board receiving jig 130 is provided so that the mounted electronic components protruding on the board do not interfere with the printing frame 112.
Is arranged below the circuit board 101, and the circuit board 101 is bent in a convex shape by a guide means or the like by causing a conveying roller 141 for conveying the circuit board 101 to act from above, and the circuit board 101 is placed on the upper surface of the board receiving jig 130. A method is known in which printing is performed on the arranged substantially flat substrate portion 101A.

When the pre-attached component is present on the circuit board 101 as described above, as shown in FIG. 8, the pre-attached component 101d on the circuit board 101 is projected upward to the printing surface plate 111 so as to avoid the pre-attached component 101d. There is also known a method in which the component avoiding portion 111p is formed so as not to damage the preliminarily attached component 101d during printing. In this method, the squeegee 120 is made of a soft material such as urethane resin so as to correspond to the uneven printing surface plate 111 having the convex component avoiding portion 111p, or the tip end portion of the squeegee 120 is easily deformed. There may be slits or holes in the.

[0005]

However, in the above-mentioned conventional method for printing cream solder, since the cream solder 121 is exposed to the atmosphere, it is hardened by an oxidation reaction or volatilization of the flux component, resulting in a change in viscosity or solidification. As a result, the print state becomes uneven, the holes are insufficiently filled, and the screen may be clogged or the squeegee may be damaged.

Further, in the method of printing with the circuit board 101 bent as described above, it is difficult to sufficiently secure the flatness of the board portion 101A due to the rigidity of the circuit board 101, and particularly, the board portion 101A. Since the substrate is easily bent at the peripheral edge portion (a portion close to the bent portion), the printing quality is deteriorated, the yield is reduced, and the productivity is lowered due to the correction work. For example, if the flatness of the circuit board 101 is impaired, as shown in the enlarged view of FIG. 7, the adhesion between the printing surface plate 111 and the circuit board 101 deteriorates, and the gap G is generated, so that the cream solder 121 is formed. The land portion 101p to be printed may protrude from the land portion 101p and may become a ball-shaped and adhered state on the circuit board 101 after soldering. There is also a problem that the protruding cream solder 121 adheres to the periphery of the hole portion 111a on the lower surface of the printing surface plate 111, and the adhered cream solder 121 is transferred during subsequent printing to stain the circuit board. . Further, this method has a drawback that it cannot be used for a circuit board such as a so-called rigid board which is difficult to bend.

Further, as shown in FIG.
Even when the convex component avoiding portion 111p for avoiding the preliminarily attached component 101p is provided in the first component, a gap is generated between the printing surface plate 111 and the circuit board 101 when the squeegee 120 passes through the component avoiding portion 111p. This is a squeegee 120
Of the convex component avoiding portion 111
p cannot be imitated completely, and the parts avoiding unit 11
This is because the flexibility of 1p is also insufficient. Therefore, in the vicinity of the front-end component 101d, the printing surface slab 11 is similar to the above.
1 causes a defect due to the gap between the printed circuit board 101 and the circuit board 101, resulting in defective printing.

For the above reasons, it is difficult to mount an element in the vicinity of the pre-mounted component on the circuit board having the pre-mounted component in the conventional art. There was a problem that the improvement of

Therefore, the present invention solves the above-mentioned problems, and an object of the present invention is to satisfactorily print a cream solder or the like even if there are irregularities such as pre-mounted components already mounted on a circuit board. An object of the present invention is to provide a screen printing plate or a screen printing device that can be used.

[0010]

In order to solve the above-mentioned problems, the screen printing plate of the present invention comprises a printing surface portion having a printing pattern and a side surface portion which is provided upright from the periphery of the printing surface portion. It is characterized by

According to the present invention, by having the side surface portion which is integrally erected from the peripheral edge of the printing surface portion, the printing surface portion is configured to project to the printing target side, and the periphery of the printing surface plate is formed as in the conventional case. Since there is no print frame on the print surface, by designing the size of the print surface part according to the print target, it is possible to bring the print surface part into close contact with the print target with unevenness without causing interference or other problems. Therefore, it is possible to maintain a good print state.

In the present invention, it is preferable that the side surface portion has a cylindrical shape that is erected from the entire peripheral edge of the printing surface portion.

According to the present invention, since the side surface portion has a tubular shape which is erected from the entire peripheral edge of the printing surface portion, the side surface portion is formed into, for example, a box shape, and rigidity can be increased, so that printing accuracy is improved. It is possible to let In particular, sufficient rigidity can be obtained even if the side surface portion is made of a thin plate material similar to the printing surface portion.

In the present invention, it is preferable that the printing surface portion and the side surface portion are integrally formed of the same material.

According to the present invention, since the printing surface portion and the side surface portion are integrally formed of the same material, the manufacturing is facilitated and the shape accuracy and rigidity can be improved. Here, the integrally molded product includes, for example, a product formed by subjecting a single plate-shaped material to plastic working (forging, pressing, etc.), and a product formed by die molding such as injection molding.

In the present invention, it is preferable that the printing surface portion and the side surface portion are integrally formed of a plate-shaped material having substantially the same thickness.

According to the present invention, it can be easily manufactured by drawing a press or the like.

In the present invention, it is preferable that the side surface portion has an edge portion protruding outward or inward from the upper end.

According to the invention, the rigidity can be further increased by the edge portion, and the edge portion can be easily attached to the printing apparatus. In this case, in order to further increase the rigidity, it is desirable that the edge portion is provided so as to project from the entire upper end of the side surface portion.

In the present invention, it is preferable that the printing surface portion and the side surface portion are made of a thin metal plate.

According to the present invention, since it is possible to obtain sufficient rigidity even when formed to be extremely thin, it is possible to sufficiently cope with the case where an extremely thin printed layer is formed.

In the present invention, the metal thin plate is preferably made of stainless steel.

In this case, since the material is excellent in rigidity, flexibility, durability and corrosion resistance, sufficient printing quality can be secured.

Next, a screen printing apparatus of the present invention is characterized by including the screen printing plate described in any one of the above, and a printing material supply means arranged inside the side surface portion of the screen printing plate. To do.

In the present invention, it is preferable that the printing material supply means has a printing material storage section for storing the printing material and a nozzle for guiding the printing material from the printing material storage section onto the inner surface of the printing surface section.

According to the present invention, the printing material such as cream solder can be stored in the printing material storage portion, and the printing material is guided to the inner surface of the printing surface portion through the nozzle, so that the printing material is exposed to the atmosphere. As a result, deterioration of the printing material can be reduced, and the surroundings are less likely to be contaminated with the printing material, so that maintenance work can be reduced.

In the present invention, it is preferable that the nozzle has a flexible or elastic nozzle end that comes into contact with the printing surface portion from the inside.

According to the present invention, since the nozzle end having flexibility or elasticity comes into contact with the printing surface portion from the inside, damage to the printing surface portion can be reduced.

In the present invention, it is preferable that the nozzle end has a cylindrical shape.

According to the present invention, since the nozzle end is formed in the tubular shape, the possibility that the printing material is exposed to the atmosphere can be further reduced, and the printing material is less likely to leak to the outside of the nozzle end. It is also possible to prevent stains on the printing surface.

In each of the above inventions, it is preferable to print a conductive connecting material such as cream solder, and it is preferable to print on a circuit board.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of a screen printing plate and a screen printing apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

[First Embodiment] FIG. 1 is a schematic perspective view showing the shape of a first embodiment of a screen printing plate according to the present invention, and FIG. 2 is a screen printing process using the screen printing plate shown in FIG. It is a schematic structure sectional view showing the structure of a 1st embodiment of a device typically.

As shown in FIG. 1, the screen printing plate 21
0 has an integral box shape composed of a thin metal plate such as stainless steel. At the bottom of the screen printing plate 210, a substantially flat printing surface portion 211 having a printing pattern (printing hole portion) appropriately formed is provided. Further, a side surface portion 212 is provided upright from the entire peripheral edge of the printing surface portion 211,
It has a tubular shape as a whole. At the upper end of the side surface portion 212, an edge portion 213 is provided which is projected so as to open by bending the plate-shaped material outward. Unlike the illustrated example, the edge portion 213 may project inward.

In this screen printing plate 210, the printing surface portion 211 and the side surface portion 212 are integrally formed of a plate-shaped material having the same thickness. In addition, the edge portion 213
Also, regarding the above, the plate-shaped material having the same thickness is integrally configured.

This screen printing plate 210 is, for example,
The printing surface portion 21 is formed by drawing a thin metal plate.
1. Formed by forming a box shape having the side surface portion 212 and the edge portion 213, and then performing plate making processing such as etching processing for providing a printing pattern on the printing surface portion 211, that is, forming a hole portion for filling with cream solder. it can.

More specifically, in the screen printing plate 210, the printing surface portion 211 formed at the bottom is formed in a rectangular shape, and the side surface portion 21 erected from the entire peripheral edge of the printing surface portion 211.
The reference numeral 2 is formed in a rectangular tube shape having four rectangular plate-shaped portions. In addition, the edge portion 213 extends horizontally from the entire upper edge of the side surface portion 212 to the outside with a substantially equal width. Edge 213
Is provided with a mounting portion (mounting hole in the illustrated example) 213a for mounting to a support 220 described later. The entire screen printing plate 210 is composed of a thin metal plate having a thickness of about 100 to 200 μm.

The plane size of the screen printing plate 210, that is, the size of the printing surface portion 211 can be formed according to the printing target. For example, when a circuit board is to be printed, if there are prefabricated components on the circuit board, it is possible to avoid the prefabricated component and to print at the printing location, so that the printing location between the prefabricated components on the circuit board It has a size that can be inserted into. The dimension of the printing surface portion 211 of the screen printing plate 210 is, for example, 12 mm × 5 mm.

As shown in FIG. 2, this screen printing plate 210 is used by attaching and fixing an edge portion 213 to the lower end portion of the support 220. The printing material supply means 230 is arranged inside the support 220. The printing material supply unit 230 includes a syringe 231 containing a printing material such as cream solder, an extruding rod 232 configured to extrude the printing material in the syringe 231, and a nozzle tube 233 attached to the syringe 231. A flexible or elastic nozzle end 23 that is attached to the tip of the nozzle tube 233 and is made of rubber, soft resin, or the like.
And 4 are provided. The nozzle end 234 is in contact with the inner surface of the printing surface portion 211 inside the screen printing plate 210.

The printing material supply means 230 is the support 2
In addition to being fixed in the material supply direction (vertical direction in the drawing) within 20, the whole is movably held in the plate surface direction of the printing surface portion 211 by a flexible sealing material 234 or the like. Further, the push rod 232 is configured to be able to be pressed against the support 220 in the material feeding direction. For example, the support 2
A pressure chamber 221 is provided on the upper part of the opening 20, and the opening 221a
Fluid (eg, air) is introduced from above to push down the push rod 232 by fluid pressure, and the syringe 231
The printing material (cream solder) contained inside can be extruded.

The support 220 has a syringe 231.
A pair of pressurizing chambers 222 and 223 are provided on the side of the pressurizing chamber 222. The fluid pressure in the pressurizing chamber 222 due to the fluid (for example, air) introduced from the opening 222a and the fluid (for example, air) introduced from the opening 223a. The syringe 231 can be moved in the horizontal direction depending on the magnitude relationship with the fluid pressure in the pressurizing chamber 223. In this embodiment,
By periodically reversing the magnitude relationship between the fluid pressures in the pressurizing chambers 222 and 223, the entire printing material supply means 230 in the support 220 can be reciprocated along the plate surface of the printing surface portion 211. Is configured. Note that this operation mode is not limited to reciprocating operation, but may be any operation mode such as a rotating operation or a random operation.

As shown in FIG. 3, the nozzle end 234 is configured to supply the printing material supplied from the syringe 231 through the nozzle tube 233 to the printing surface portion 211. In this case, since the nozzle end 234 is formed in a tubular shape, the printing material is sealed by keeping the entire circumference of the nozzle end 234 in contact with the printing surface portion 211 at all times.
It can be configured so that it is not exposed to the outside air. In this embodiment,
Since the nozzle end 234 is formed in a tubular shape, the nozzle end 23 is slidably brought into contact with the printing surface portion due to the reciprocating motion.
When the contact portion of No. 4 deteriorates, the nozzle end 234 can be rotated around the axis and the posture in the reciprocating direction can be changed to continue the use as it is. It is preferable that the nozzle end 234 has a cylindrical shape so as not to have directivity, but the nozzle end 234 is not limited to the cylindrical shape, and may have a rectangular tubular shape or any other tubular shape. As the dimensions of the nozzle end 234,
For example, outer diameter 3.6 mm, inner diameter 2.4 mm, length 4.5
mm.

The screen printing apparatus 200 includes a support 22.
Feeding direction by a moving means (not shown) connected to 0
It is configured to be movable. A transport mechanism 240 including a transport roller 241 is provided below the screen printing apparatus 200, and the transport means 240 transports the circuit board 101 in the horizontal direction.

On the circuit board 101, a land portion 101p formed by a part of a conductor pattern (not shown) is formed. Then, the screen printing device 200
Thus, a printing material such as cream solder is printed on the land portion 101p to form the solder layer 201. Here, the electronic component (preliminary component) 101d is already mounted on the circuit board 101 in the previous process.

The circuit board 101 is transported by the transport mechanism 240, and is stopped when the land portion 101p to be printed reaches the position directly below the screen printing apparatus 200.
Then, the support 220 descends, and the screen printing plate 21
The zero printing surface portion 211 is brought into close contact with the land portion 101p. Then, the syringe 231 is reciprocated while pushing down the push rod 232. Then, as shown in FIG. 3, while the printing material is pressed from above, the nozzle end 2
Since 34 moves while being in contact with the printing surface portion 211, the printing material is the printing holes 211 a provided in the printing surface portion 211.
Through the land portion 101p. When the solder layer 201 is formed on the land portion 101p by the printing material, the support 220 rises and separates from the circuit board 101.

In this embodiment, the screen printing plate 210
Is the pre-attached component 1 arranged with the land portion 101p sandwiched therebetween.
It is formed in a size that can be inserted within the interval of 01d.
As a result, printing can be performed on the land portion 101p without interfering with the pre-attached component 101d. Further, since the pre-attached part 101d and the screen printing plate 210 do not interfere at all, the screen printing plate 210 and the circuit board 101
Since there is no problem in the adhesiveness with, it is possible to suppress the deterioration of printing quality.

[Second Embodiment] Next, a second embodiment of the screen printing plate and the screen printing apparatus according to the present invention will be described with reference to FIGS. 4 and 5. In this embodiment, as shown in FIG. 5, a printing surface portion 311 having a circular or elliptical shape and a side surface portion 312 having a cylindrical shape or an elliptic cylindrical shape standing upright from the entire peripheral edge of the printing surface portion 311 are integrally provided. In the screen printing plate 310 of this embodiment, the edge portion provided in the screen printing plate 210 of the first embodiment does not exist. The screen printing plate 310 has a printing surface portion 311 and a side surface portion 312 as described above.
And are integrally formed of a plate-shaped material having the same thickness.

The screen printing apparatus 300 of this embodiment
As shown in FIG. 4, a support 3 similar to that of the first embodiment is used.
20 and printing material supply means 330. In addition, a transport mechanism 34 that transports the circuit board 101 that is a print target.
0 is also the same as in the first embodiment. Therefore, for these, the openings 321a, 322a, 32
The same applies to the pressurizing chambers 321, 322, 323 having 3a, the seal member 324, the syringe 331, the pushing rod 332, the nozzle tube 333, and the nozzle end 334, and the description thereof will be omitted.

In this embodiment, since the screen printing plate 310 is not provided with the edge portion as described above, the support 3
The lower end portion of 20 is the side surface portion 3 of the screen printing plate 310.
It is attached and fixed to 12. The screen printing plate 310 has sufficient rigidity because the printing surface portion 311 and the side surface portion 312 are integrally formed, but it is further fixed to the support 320 at a plurality of positions. By having such a structure, higher rigidity can be obtained. This point also applies to the screen printing plate 210 of the first embodiment described above.

[Effects of the Embodiment] In each of the embodiments described above, the screen printing plates 210 and 310 include the printing surface portions 211 and 311 and the side surface portion 212 which is provided upright from the entire peripheral edge of the printing surface portions 211 and 311. Since the printing surface portions 211 and 311 have a projecting shape because they are integrally provided with the printing apparatus 312, it is possible to access only the printing portion by appropriately setting the sizes of the printing surface portions 211 and 311. For example, it is possible to perform printing on a circuit board on which the preliminarily mounted component is mounted without any interference without interfering with the preliminarily mounted component. Therefore, it is possible to design the circuit board so as to increase the packaging density.

Further, the screen printing plates 210, 31
In No. 0, since the printing surface portion and the side surface portion are integrally formed, sufficient rigidity can be obtained even if the printing surface portion and the side surface portion are made of the same material, for example, a thin plate material. Moreover, since the whole can be made of the same plate-shaped material, it can be easily manufactured by plastic working of the plate-shaped material, so that it can be formed with high accuracy and low cost. Here, since the screen printing plate of the present embodiment does not require a printing frame, there is an advantage that the device can be made compact and the printing plate can be easily replaced.

In particular, the screen printing plate 2 of the first embodiment
10, the edge portion 211 bent at the upper end of the side surface portion 212 is integrally provided, so that the rigidity of the screen printing plate can be further increased.

Furthermore, since printing can be performed in a flat state even with the above-described hoop-shaped substrate, flexible substrate, or rigid substrate, a good printing state without printing defects can be obtained. Can be maintained. Therefore, the correction work after the soldering work is reduced, and the man-hour can be reduced. Further, since the guide means for bending the substrate is not required and the component avoiding portion for avoiding the pre-attached component is not required, the structure of the printing apparatus can be simply configured and the manufacturing cost can be reduced.

Further, in each of the embodiments, since the printing material such as cream solder does not come into contact with the outside air, it is possible to reduce the deterioration of the printing material and the change in characteristics, and it is possible to maintain the printing state in good condition. Since the surroundings are less likely to get dirty due to the printing material, maintenance work becomes easier.

The screen printing plate and the screen printing apparatus of the present invention are not limited to the above illustrated examples, and it goes without saying that various modifications can be made without departing from the scope of the present invention. .

[0056]

As described above, according to the present invention,
It is possible to provide a screen printing plate or a screen printing device that can satisfactorily print cream solder or the like even if there are irregularities such as pre-mounted components mounted on the circuit board.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing the shape of a first embodiment of a screen printing plate according to the present invention.

FIG. 2 is a schematic cross-sectional view schematically showing a schematic configuration of the screen printing apparatus according to the first embodiment of the present invention.

FIG. 3 is an enlarged cross-sectional view showing the vicinity of a nozzle end portion in a printing state according to the first embodiment.

FIG. 4 is a schematic cross-sectional view schematically showing a schematic configuration of a screen printing device according to a second embodiment of the invention.

FIG. 5 is a schematic perspective view showing the shape of a second embodiment of the screen printing plate according to the present invention.

FIG. 6 is a schematic perspective view schematically showing a schematic configuration of a conventional screen printing device.

FIG. 7 is an enlarged sectional view showing a conventional screen printing state in an enlarged manner.

FIG. 8 is a cross-sectional view showing an example of a conventional screen printing state.

[Explanation of symbols]

200 ... Screen printing device, 210 ... Screen printing plate, 211 ... Printing surface part, 212 ... Side part, 213 ... Edge part, 220 ... Support, 230 ...
..Printing material supply means 231, ... Syringes, 232
... Extrusion rod, 233 ... Nozzle tube, 234 ...
・ Nozzle end

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Claims (11)

[Claims] 1. A screen printing plate comprising a printing surface portion having a printing pattern and a side surface portion which is provided upright from a peripheral edge of the printing surface portion. 2. The screen printing plate according to claim 1, wherein the side surface portion has a cylindrical shape that is erected from the entire peripheral edge of the printing surface portion. 3. The printing surface portion and the side surface portion are integrally formed of the same material.
Alternatively, the screen printing plate according to claim 2. 4. The printing surface portion and the side surface portion are integrally formed of a plate-shaped material having substantially the same thickness, as claimed in any one of claims 1 to 3. Screen printing plate according to the item. 5. The screen printing plate according to claim 1, further comprising an edge portion protruding outward or inward from an upper end of the side surface portion. 6. The printing surface portion and the side surface portion are formed of a thin metal plate.
The screen printing plate according to any one of 1. 7. The screen printing plate according to claim 6, wherein the thin metal plate is made of stainless steel. 8. A screen printing plate according to any one of claims 1 to 7, and a printing material supply unit arranged inside the side surface portion of the screen printing plate. Screen printing device. 9. The printing material supply unit includes a printing material storage unit that stores the printing material, and a nozzle that guides the printing material from the printing material storage unit onto the inner surface of the printing surface unit. 8. The screen printing device according to item 8. 10. The screen printing apparatus according to claim 9, wherein the nozzle has a flexible or elastic nozzle end that comes into contact with the printing surface portion from the inside. 11. The screen printing apparatus according to claim 10, wherein the nozzle end has a tubular shape.