JP2003039633A - Method for screen process printing, method for producing, ceramic circuit board, and mask for screen process printing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the precision of printing and to extend the life of a screen mask by holding the reduction of the tension of the screen mask by repeated use at a proper value by a simple operation without making the structure complex. SOLUTION: A printing mask 1 is used, which can adjust the tension of the set screen mask 7 by elastically deforming frame side parts 3 and 4 constituting a mask frame 2 outside. A screw member 9 is arranged, while being stretched, between the frame side parts 3 and 4 which are arranged to face each other, and the distance between the frame side parts 3 and 4 is enlarged by turning an adjusting nut 16 to adjust the tension of the screen mask 7. When the tension is reduced, the nut 16 is turned appropriately, and a downsized printing pattern part P in the middle of the mask is elongated with the frame to keep the tension properly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen printing method, a method for manufacturing a ceramic wiring board, and a screen printing mask used in these methods.

[0002]

2. Description of the Related Art In order to form a wiring layer, a ceramic wiring board is formed by laminating, press-bonding and firing ceramic green sheets printed with a metallizing ink (also called metallizing paste) made of a refractory metal such as tungsten. Is formed by. In this case, as the ceramic green sheet, one having a size capable of obtaining a large number of wiring boards at a time is used, and it is usually divided into each wiring board unit after firing. By the way, the printing of the metallized ink (hereinafter, also simply referred to as ink) on such a ceramic green sheet has been conventionally performed by a screen printing method. In screen printing, as shown in FIG.
A ceramic green sheet (hereinafter, also referred to as a green sheet) G as an object to be printed is positioned and placed on a flat printing table 100, and a screen mask (plate) 7 is placed thereon.
The mask frame 2 to which is attached is positioned and overlapped. Then, the ink 105 placed on the screen mask 7 is scratched or pressed by a squeegee 106, the ink is transferred to the surface of the green sheet G, and a predetermined pattern is printed.

FIG. 9 is a plan view of a screen printing mask 101 used for such screen printing. As shown in FIGS. 8 and 9, the screen mask 7
Is attached to the lower surface of the mask frame 2 which is rectangular in plan view. This mask frame (hereinafter, also simply referred to as a frame) 2
Is usually formed in a frame (frame) shape by the frame side portions 3 to 6 having a square cross section so as to form a quadrangular frame, and the screen mask 7 holds a predetermined tension on the lower surface of the frame. Sticked. The mask frame 2 is, for example, an integrally molded product made of metal such as aluminum die cast,
Usually, it has an assembled structure in which the frame side parts are assembled. On the other hand, the screen mask (hereinafter, also simply referred to as a mask) 7 is formed by using, for example, a thin plate made of a stainless alloy as a material, and although not shown in detail, the edge portions are frame side portions 3 to 6 so as to wrap the frame from the lower surface. It is fixed so as to be wound along with and is attached to the frame 2. The mask 7 is provided with a print pattern portion (a region indicated by a two-dot chain line in the figure) P at the center thereof so that a desired print pattern can be obtained, and a large number of printing openings are formed therein. Are formed in a mesh shape or a group of micropores is formed.

[0004]

By the way, by using such a screen printing mask 101, the ink 10
When printing 5, the squeegee 106 presses the mask 7 downward to cover the ink, so that a strong tensile force acts on the mask 7 during the printing process. Therefore, by repeating such printing,
The print pattern portion P in the center of the screen mask 7 is elongated, though it is very small, and the tension at the time of attachment is reduced. If the tension of the mask 7 is reduced (stretching of the mask), in the free state, the reduction of the tension causes the print pattern portion P of the screen mask 7, that is, the innumerable minute aperture group, to delicately shrink. become. As a result, the print pattern is slightly reduced, an error occurs in the print position, and the printing accuracy is degraded.

Therefore, in such screen printing,
In the case of printing that requires accuracy, if the elongation of the screen mask 7 due to repeated printing becomes a certain amount or more, even if it is slightly more than a certain amount, the mask is replaced as the life of the mask to maintain the printing accuracy. Therefore, in order to maintain high printing accuracy with such a printing method, it is necessary to frequently replace the mask. Therefore, in the case where extremely high printing accuracy is required, such as printing of metallized ink for a wiring layer on a ceramic green sheet for manufacturing a ceramic wiring board, reduction in manufacturing efficiency and increase in manufacturing cost may occur. I was invited, and the problem was big.

The present invention has been made in view of these problems, and its purpose is as follows. That is, it is possible to hold the tension at a proper value by an operation with a simple mechanism, which causes a decrease in printing accuracy due to a minute elongation of the screen mask due to repeated use.
It is therefore an object of the present invention to provide a technique capable of improving the printing accuracy and extending the life of the screen mask.

[0007]

In order to achieve the above-mentioned object, the invention according to claim 1 uses a mask for screen printing comprising a mask frame and a screen mask attached to the mask frame. In the method of screen-printing on a substrate to be printed, a screen comprising tension adjusting means of a screen mask by a screw mechanism, which adjusts the tension of the screen mask by elastically deforming a frame side portion constituting the mask frame outward. It is characterized by using a printing mask.

According to the present invention, the tension of the screen mask is adjusted by elastically deforming the frame side portion constituting the mask frame outward by the tension adjusting means of the screen mask by the screw mechanism according to the extension of the screen mask. It uses a possible screen printing mask. Therefore, with respect to the screen printing mask, the structure is not complicated, and the adjustment can be appropriately performed by a simple operation, so that highly accurate printing can be repeatedly performed with the same screen mask. .

The tension adjusting means of the screen mask elastically deforms the frame side parts constituting the mask frame outward to widen the interval between the opposing frame side parts of the mask frame. It may be embodied by the screw mechanism.

However, in the screen printing method according to the first aspect, as in the second aspect, the tension adjusting means of the screen mask includes a print pattern portion formed substantially in the center of the screen mask in plan view. It is advisable to place multiple units, avoiding overlapping. In particular, the tension adjusting means may be arranged substantially symmetrically on both side edges of the screen mask.

According to a third aspect of the present invention, there is provided a method of manufacturing a ceramic wiring board, wherein a ceramic wiring is formed by using a screen printing mask including a mask frame and a screen mask attached to the mask frame. When screen-printing a metallized ink for forming a wiring layer or the like on a ceramic green sheet for manufacturing a substrate, elastically deform the frame side portion constituting the mask frame outward to adjust the tension of the screen mask. A screen printing mask provided with a screen mask tension adjusting means using a screw mechanism is used.

The screen printing method according to claim 1 or 2 can be applied regardless of the material to be printed. However, in printing the metallized ink on the ceramic green sheet for manufacturing the ceramic wiring board, a minute printing error becomes a problem. Therefore, the effect is obtained in the method for manufacturing the ceramic wiring board according to claim 3. Is big.

Also in the method for manufacturing a ceramic wiring board according to claim 3, the tension adjusting means of the screen mask is formed substantially in the center of the screen mask in plan view as described in claim 4. It is advisable to arrange a plurality of print patterns so that they do not overlap the print pattern portion.

According to a fifth aspect of the present invention, in a screen printing mask including a mask frame and a screen mask attached to the mask frame, a frame side portion forming the mask frame is outside. It is characterized by comprising a screen mask tension adjusting means by a screw mechanism for elastically deforming the screen mask to adjust the tension of the screen mask.

In the present invention, according to the elongation of the screen mask, the tension adjusting means of the screen mask by the screw mechanism elastically deforms the frame side parts constituting the mask frame outward so that the frame side parts facing each other are deformed. Since the tension of the screen mask can be adjusted by widening the interval, high-precision printing can be performed many times without complicating the structure.

Also, in the screen printing mask according to the fifth aspect, as in the sixth aspect, the tension adjusting means of the screen mask is a printing pattern formed in a plan view substantially in the center of the screen mask. It is advisable to place multiple units so that they do not overlap with the parts.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of a screen printing mask of the present invention will be described in detail with reference to FIGS. FIG. 1 is a plan view and an enlarged view of an essential part of a screen printing mask 1 used in the method of the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG. 1 and an enlarged view of the essential part. The mask frame 2 forming the screen printing mask 1 is made of, for example, aluminum and is formed in a rectangular frame shape.
Each of the frame side portions 3 to 6 forming the four sides is a rod-shaped body having a substantially rectangular cross section. Further, the screen mask 7 has its edge 7a wound from the lower surface (lower side surface in FIG. 2) of each frame side portion 3 to 6 to the outer and upper surfaces 3a, 4a, 5a, 6a, and the lower surface of the frame 2. It is attached to. Then, at appropriate places on the upper surfaces of the four frame side portions 3 to 6 of the frame 2, the edge portion 7a is fixed from above the screen mask 7 by screwing or the like, and a constant tension is applied to the mask frame 2,
The tension is maintained. The mask frame 2 is an integrally molded product formed by die casting and processed into a predetermined size. Further, the screen mask 7 may be fixed to the frame side portions 3 to 6 with an adhesive or the like.

In this embodiment, the tension adjusting means of the screen mask 7 is provided to the mask frame 2 as described below. In the present embodiment, among the frame side portions 3 to 6, between the frame side portions 3 and 4 facing each other forming the short side, a plan view,
A vertical line S passing through the centers of the frame sides 3 and 4 of the short side is sandwiched,
Two shafts (made of SUS304, for example, round rods having an outer diameter of 10 mm and a length of about 400 mm) 9 are arranged substantially in parallel with each other with a predetermined interval. Since the tension adjusting means including one shaft 9 is the same, one of them will be described below. The two shafts 9 and 9 are arranged so as to avoid the print pattern portion (rectangular area of the two-dot chain line in FIG. 1) P in the center of the screen mask so as not to hinder the movement of the squeegee. There is.

That is, in this embodiment, the shaft 9 as described below is used as the tension adjusting means. As shown in FIGS. 1 and 2, the shaft body 9 has a screw (for example, M10) 10 having a constant length (for example, 30 mm) on the outer peripheral surfaces of both ends thereof,
Equipped with 10. In addition, in the present specification, a simple term "screw" means a right-hand thread. The shaft body 9 is fixed by screwing a right end portion of the shaft body 9 into a screw hole 11 provided in the frame side portion 4 by a predetermined amount. However,
To prevent loosening, for example, a lock nut 12 is fastened to the inner side surface of the frame side portion 4 on the right side in the drawing. The lock may be made by pinning. On the other hand, the left end portion of the shaft body 9 in the drawing is a straight hole 14 provided in the frame side portion 3.
A nut 16 for adjusting which constitutes a tension adjusting means is screwed to an inner surface of the frame side portion 3 on the left side in the figure through a slip washer 15 so as to fit in a gap.

That is, the nut 16 for adjustment is rotated and screwed to the left in the drawing, and the slip washer 15 is inserted.
From the state where the adjusting nut 16 is brought into contact with the inner surface of the frame side portion 3, the nut 16 is further rotated and screwed to the left in the drawing. Then, the opposing left and right frame side portions 3 and 4 receive a force in the axial direction of the shaft body 9 by the adjusting nut 16 and the shaft body 9 to push the mutual interval between the left and right frame side portions 3 and 4. Receives the action of being unfolded. As a result, the left and right frame sides 3, 4 are elastically deformed outward as shown by exaggeratedly shown by the two-dot chain line in FIG. 1, so that the interval between the opposing frame sides becomes large. When the frame side portions 3 to 6 are made of the same material as in the present embodiment and have the same cross-sectional shape and size, the deformation amounts (deflection amounts) of the left and right frame side portions 3 and 4 are constant. Further, when the adjusting nut 16 is rotated in the reverse direction and moved (screwed) to the right in the drawing, the force received by the frame side portion is reduced and the deformation thereof is also reduced.
When the force becomes 0, the deformation disappears and the original frame shape and dimensions are restored.

When screen printing is performed using the screen printing mask 1 of this embodiment, the following is performed. That is, when the printing mask 1 is used, the adjustment nut 16 is initially in a non-use state. Then, as in the conventional case, the printing mask 1 is positioned and overlapped on a printing object (for example, a ceramic green sheet for producing a wiring board) placed on a printing table, and under the state, a plan view is obtained. The metallized ink is printed on the print pattern portion P of the screen mask 7 located between the shafts 9, 9. And by repeating printing,
For example, when the screen mask 7 extends in the axial direction of the shaft body 9 and the tension (tension) of the screen mask 7 in the same direction decreases, and the print pattern portion P shrinks to a predetermined value or more, the shrinkage corresponding to the shrinkage is generated. The nut 16 for adjustment in the two shafts 9 and 9 is appropriately rotated to slightly advance to the left. By doing so, the frame side portions 3 and 4 are stably elastically deformed outward, so that the screen mask 7
Is also pulled in the same direction and its tension (tension)
Is strongly maintained at an appropriate value. As a result, the dimensional accuracy of the print pattern portion P is maintained, so that the printing position and dimensional accuracy with respect to the printing material are maintained.

Thus, in response to the decrease in the tension of the screen mask 7, the nut 16 for adjustment is simply rotated every certain number of times of printing, so to speak, so to speak.
Because the mask frame 2 can be stretched,
The tension of the mask 7 can be maintained at a predetermined value by a simple operation without inviting the structure of the screen printing mask to be complicated. That is, it is possible to prevent a decrease in printing accuracy due to the expansion of the screen mask 7 due to repeated use without causing a structure to be complicated, and it is possible to increase the number of times printing can be performed with one screen mask, thereby reducing the printing cost. Planned.

The screwing amount of the adjusting nut 16 for elastically deforming each frame side portion outward is determined by the pitch of the screw 10 and the rotation speed (rotation angle) of the adjusting nut 16, so that the pitch is 1 mm, for example. When it is desired to set the pushing amount of the interval between the frame side portions 3 and 4 at the position of the shaft body 9 to be 0.5 mm, the adjustment nuts 16 of the two shaft bodies 9 are set to 18 mm.
Rotate 0 degrees. In this way, the adjustment nut 16
Since the distance between the frame sides can be widened by a desired amount by the rotation angle or the number of rotations, the tension of the screen mask 7 can be easily adjusted. The screen mask 7
The amount of growth is very small, so the amount of adjustment once
Since the diameter is as small as 0 μm, it is preferable to select a screw having a pitch as small as possible.

By the way, when a metallized ink for a wiring layer or the like is printed on a ceramic green sheet, when a conventional screen printing mask is used, it is 1000
After printing about once, there was a problem with the reduction of the print pattern portion due to the elongation of the screen mask, and it became impossible to use the screen mask. On the other hand, in the case of using the screen printing mask of the present embodiment, the interval between the frame side portions 3 and 4 is increased by about 5 to 10 μm every 1000 times of printing, and thus, up to about 4000 times. I was able to increase the number of prints.

The tension adjusting means of the screen mask 7 by the screw mechanism in the present invention is not limited to the above-mentioned embodiment. The same means uses various known screw mechanisms so as to elastically deform the frame side portions forming the mask frame 2 outward to widen the interval between the frame side portions 3 and 4 facing each other of the mask frame 2. it can.

FIG. 3 shows another embodiment of the screen printing mask 21, except that the tension adjusting means of the screen mask 7 by the screw mechanism is different from that of the above-mentioned embodiment, and the other constructions are the same. Since there is no difference, only the difference will be described and the same portions will be denoted by the same reference numerals. That is, the same screw hole 11 as that described above is provided on the opposite frame side portion 4 on the right side in the drawing, and the long bolt 29 is screwed into the screw hole 11 and the tip 2
It is arranged so that 9a abuts on the inner side surface of the frame side portion 3 on the left side in the figure that faces. However, the head 29b of the long bolt 29
The lower length L is determined by the outer side surface of the frame side portion 4 and the head portion 29 on the right side in the figure in a state where the tip 29a is in contact with the inner side surface of the frame side portion 3.
It is necessary to use a lock nut 12 which can be interposed between the lock nut 12 and b, and which has a length which allows for a necessary adjustment amount. Similarly to the above-described embodiment, the long bolts 29 forming the tension adjusting means are arranged in a plan view, avoiding a plurality of long bolts 29 so as not to overlap the print pattern portion P formed substantially in the center of the screen mask 7, for example, symmetrical with respect to the central horizontal line S in FIG. It is preferable to arrange it at.

In this case, when the tension of the screen mask 7 decreases, the lock nut 12 is loosened, and in response to the decrease, the head of the long bolt 29 (or a handle provided at the tip thereof) is appropriately used. ) 29b may be rotated and tightened. In this case, for example, the tip 29a of the long bolt 29 slightly enters the inner side surface of the frame side portion 3 on the left side in the drawing so that the axis of the long bolt 29 does not displace. It is advisable to provide the concave portion as described above. When using a screw which does not loosen the long bolt 29 without the lock nut 12, the lock nut is of course unnecessary.

Further, FIG. 4 shows a screen printing mask 71.
Another embodiment of the present invention is shown. However, this is also different only in the tension adjusting means of the screen mask 7, and other configurations are the same as those in the first embodiment. Only the description will be given, and the same parts will be given the same reference numerals. In this case, the same screw hole 11 as that provided in the right frame side part 4 in FIG. 1 is provided in the opposite frame side part 3 on the left side in the drawing, and the inner surface of the frame side part 3 is provided in this screw hole 11. From the recess 2 at the center of the end face of the head 29b.
A short adjusting bolt 29 provided with 9c is screwed in. On the other hand, a concave portion 39c is also formed on the inner side surface of the frame side portion 4 on the right side in the figure which faces the concave portion. Then, the both concave portions 29
For example, a round bar (circular shaft) 39 is interposed between c and 39c so as to be perpendicular to the frame sides 3 and 4 facing each other. With this configuration, when the adjusting bolt 29 is screwed back (advancing to the right side in the drawing), it becomes a strong tension, so that the opposing frame side portions 3 and 4 forming the mask frame 2 are elastic so as to bend outward. It is deformed and the space between the frame sides is widened.
Thus, the tension of the screen mask 7 attached to the frame 2 is adjusted. Even in this case,
If necessary, the lock nut 12 may be screwed as shown by the two-dot chain line in the figure.

FIG. 5 shows another mask 41 for screen printing, which is different only in the tension adjusting means of the screen mask 7,
Since other configurations are the same as those of the first embodiment, only the differences will be described, and the same portions will be denoted by the same reference numerals. This is constructed as follows. The nut members 42 and 43 forming left and right reverse screws are welded to the inside of the facing frame side portions 3 and 4 in parallel with the straight line S passing through the respective centers of the frame side portions 3 and 4 in plan view. It is fixed coaxially (line) by. For example, a right-handed nut member 42 is fixed to the inner surface of the left frame side portion 3 by welding or the like, and a left-handed nut member 43 is coaxially fixed to the inner surface of the right frame side portion 4. However, in the frame side parts 3 and 4,
Through holes 14 are formed coaxially with the shafts of the nuts 42, 43 and larger than the screw diameter. Then, a shaft member 49 having a screw threaded to the nut members 42, 43 at the tip thereof,
50 is prepared, and as shown in FIG. 5, these are screwed to the nuts 42 and 43 by screws through the screws at the tips thereof.
However, the base end portions of the left and right shaft members 49, 50 (portions near the center on the left and right in the figure) are connected by a connecting member 51 so that the shaft members 49, 50 can rotate simultaneously in the same direction. For example,
Straight connecting holes 44 are formed in the connecting member 51 so as to penetrate both ends thereof, and the base end portions of both shaft members 49 and 50 are inserted into the connecting holes 44 from the respective ends of the connecting member 51. Attach the screw at the tip of each shaft member 49, 50 to each nut 42,
Screw an appropriate amount into 43. Then, the pin 53 is driven and fixed to the connecting member 51 so as to penetrate in the radial direction of the base end portions of both the shaft members 49 and 50. In the present embodiment, by rotating the connecting member 51 around the axis, both shaft members 49, 50 are rotated.
If it can be rotated together, therefore
You may fix with a set screw instead of driving a pin. With such a configuration, when the connecting member 51 is rotated to one side, the opposite screw side mechanism causes the opposing frame side portions 3,
Since the distance between the four masks becomes closer or closer, the tension of the screen mask 7 can be adjusted.

In each of the above-described embodiments, the case where the tension adjusting means having the screw shaft is provided in the arrangement perpendicular to the side of the frame forming the short side of the mask frame has been exemplified. The tension adjusting means is not limited to such screw shaft arrangement. Depending on the reduction of the tension of the mask, a tension adjusting means having a screw shaft may be provided so as to be perpendicular to the frame side portion forming the long side of the mask frame.

Further, the tension adjusting means in the present invention is not limited to the one in which the screw shaft is arranged vertically or horizontally. In each of the above-mentioned embodiments, when the elongation of the screen mask between the opposing frame sides forming the long sides is also a problem, that is, when the two-dimensional elongation in both the vertical and horizontal directions of the frame is a problem, the long sides are set. The tension adjusting means of each of the above-described forms may be provided between the opposing frame sides. The same applies to a square mask frame. That is, in a plan view of the mask frame,
Although not shown in the figure, the tension adjusting means may be arranged so as to form a cross shape (a shape of a "well"). With each of the above-mentioned mask frames having a rectangular frame structure in a plan view,
When the opposing frame side portions forming the short sides bend outward, the opposing frame side portions forming the long sides conversely bend inward. Therefore, when the inward bending of the opposing frame sides forming the long sides becomes a problem, the tension adjusting means may be arranged in a cross beam shape.

In the case where the mask frame has a rectangular shape in a plan view, like the screen printing mask 51 shown in FIG.
The long bolts 59 may be arranged so as to be inclined. That is, in the four corners, 1
In plan view, a screw hole 51 is formed at a corner near the corner of the frame side portion at, for example, θ45 degrees, and a bolt 59 is screwed into the screw hole 51, and the tip of the screw hole 51 is attached to the inner surface of the frame side portions 3 and 4 adjacent to each other. The contact is made. By doing so, by screwing in the bolts 59, the intervals between the frame side portions 3 and 4 forming the short sides and between the frame side portions 5 and 6 forming the long sides can be enlarged and adjusted. It is possible to deal with the two-dimensional expansion of the screen mask 7 in both vertical and horizontal directions. In addition, the concave portion 5 is formed on the inner side surfaces of the frame side portions 3 and 4 with which the tips of the bolts 59 contact.
It is preferable to provide 9c and allow the tip of the bolt 59 to enter the recess 59c because the tip does not escape. In the figure, 12 is a lock nut. In addition,
In order to stabilize the lock nut 12, it is preferable to provide a convex portion 59d having a seating surface of the lock nut 12 that is perpendicular to the axis of the bolt 59 on the outside of the screw hole 51.

In each of the embodiments of the screen printing mask described above, the tension adjusting means of the screen mask is arranged inside the mask frame to push the frame side portion outwardly. The adjusting means may be arranged outside the mask frame so that the frame side portion is expanded outward.

FIG. 7 shows an embodiment of the screen printing mask 61 embodied as described above. That is, in the screen printing mask 61, the mask frame 2
An outer frame 62 having a higher strength than the mask frame 2 is arranged outside the mask frame 2 to have a double frame structure. However,
A shaft body 6 in which a screw is formed near the tip on the outer surface of each of the opposing frame side portions 3 and 4 forming the short side of the mask frame 2.
The base end side (mask frame 2 side) of 9 is fixed by screwing or welding so that the screw is located on the front end side. However, in the present embodiment, two shafts 69 are fixed to the outer sides of the left and right frame sides 3 and 4 vertically. The outer frame 62 is provided with a straight hole 64 through which the tip end portion of the shaft body 69 penetrates, and the straight hole 64 is arranged so that the tip end portion of the shaft body 69 projects from the straight hole 64. An adjusting nut 66 is screwed onto each of the screws near the tip of the.

Therefore, for example, by tightening the two adjusting nuts 66 on the left side, the frame side portions 3 and 4 forming the short sides of the mask frame 2 can be elastically deformed so as to be bent outward. Thereby, as in the embodiment of FIG. 1,
The reduction of the print pattern portion P due to the elongation (reduction of tension) of the screen mask 7 can be eliminated. When the double frame structure is used as described above, the outer frame 62 is
Is a mask frame 2 forming an inner frame so as not to be substantially deformed.
It is preferable that the cross-sectional shape and dimensions have as high strength (high rigidity) as possible. Even when the frame side portion that forms the mask frame is expanded from the outside of the mask frame 2 as described above, the same tension adjusting means for the screen mask is provided between the frame side portions 5 and 6 that form the long side. Can be provided.

In the present invention, the tension adjusting means of the screen mask by the screw mechanism is arranged inside the frame side portion, and by rotating the screw or bolt formed on the nut or the shaft body around the axis thereof. It is possible to use various known screw mechanisms configured such that the intervals between the facing frame side portions are in a tension shape. Also, in the case of being arranged on the outside of the frame (frame side portion), the screws formed on the nut or the shaft body are relatively rotated around the axis line, so that the mutual intervals of the opposing frame side portions are changed from the outside. Known screw mechanisms can be used that result in unfolding.

As described above, the screen printing mask according to the present invention is not limited to the above-described embodiment, and may be within the scope of the present invention.
The design can be changed and embodied as appropriate. Further, the screen printing mask is usually formed based on a mask frame having a substantially square shape in a plan view, but the present invention can be embodied even in a polygonal mask frame which cannot be called a square. The screen printing method using the screen printing mask of the present invention,
Not limited to the ceramic green sheet, it can be applied to various printed materials.

[0038]

As is apparent from the above description, according to the present invention, the same screen can be obtained by appropriately adjusting the screen printing mask without making the structure of the screen printing mask complicated. Despite being a mask, highly accurate printing can be repeated. Therefore, it is possible to improve the printing accuracy and extend the life of the screen mask. Therefore, in the printing of the metallized ink for forming the wiring layer and the like on the ceramic green sheet for manufacturing the ceramic wiring board, a remarkable effect can be obtained, so that the cost reduction of the wiring board is expected.

[Brief description of drawings]

FIG. 1 is a plan view showing a first embodiment of a screen printing mask of the present invention and an enlarged view of a main part.

FIG. 2 is a sectional view taken along the line AA of FIG. 1 and an enlarged view of a main part.

FIG. 3 is a plan view showing another form of the tension adjusting means of the screen mask and an enlarged view of a main part.

FIG. 4 is a plan view showing still another mode of the tension adjusting means of the screen mask, and an enlarged view of a main part.

FIG. 5 is a plan view showing still another form of the tension adjusting means of the screen mask and an enlarged view of a main part.

FIG. 6 is a plan view showing still another form of the tension adjusting means of the screen mask.

FIG. 7 is a plan view showing still another form of the tension adjusting means of the screen mask.

FIG. 8 is a conceptual diagram illustrating conventional screen printing.

FIG. 9 is a plan view of a screen printing mask used in conventional screen printing.

[Explanation of symbols]

1, 21, 31, 41, 51, 61 Screen Printing Mask 2 Mask Frames 3, 4, 5, 6 Frame Side 7 Screen Mask P Print Pattern Part G Green Sheet (Printed Material)

Claims (6)

[Claims] 1. A method of screen-printing an object to be printed using a screen-printing mask comprising a mask frame and a screen mask attached to the mask frame, wherein a frame side portion constituting the mask frame is formed. A screen printing method comprising: using a screen printing mask provided with a screen mask tension adjusting means by a screw mechanism for elastically deforming outward to adjust the tension of the screen mask. 2. A plurality of tension adjusting means for the screen mask are arranged so as not to overlap with a print pattern portion formed substantially in the center of the screen mask when seen in a plan view. Screen printing method. 3. A wiring layer or the like is formed on a ceramic green sheet for producing a ceramic wiring board by using a screen printing mask including a mask frame and a screen mask attached to the mask frame. A screen comprising tension adjusting means for the screen mask by a screw mechanism, which adjusts the tension of the screen mask by elastically deforming a frame side portion forming the mask frame outward in screen printing the metallized ink for A method for manufacturing a ceramic wiring board, which comprises using a printing mask. 4. A plurality of tension adjusting means for the screen mask are arranged so as not to overlap with a print pattern portion formed substantially in the center of the screen mask when seen in a plan view. For manufacturing a ceramic wiring board of. 5. A screen printing mask comprising a mask frame and a screen mask attached to the mask frame, wherein a frame side portion constituting the mask frame is elastically deformed outward to form a screen mask of the screen mask. A mask for screen printing, comprising a tension adjusting means for adjusting the tension of the screen mask by a screw mechanism. 6. A plurality of tension adjusting means for the screen mask are arranged so as not to overlap with a print pattern portion formed substantially in the center of the screen mask when seen in a plan view. Screen printing mask.