JP2004243775A - Screen printing method, method for manufacturing ceramic wiring substrate, and mask for screen printing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To hold a reduction in the tension of a screen mask caused by repeated use at a proper value with a simple operation without causing the structure complicate, to enhance a printing precision, and to prolong the service lifetime of the screen mask. <P>SOLUTION: Frame side parts 3, 4 constituting a mask frame 2 are elastically deformed externally. A printing mask 1, which can adjust the tension of the stuck screen mask 7, is used. The adjustment is executed by the following way. A screw member 9 is arranged between the opposing frame side parts 3, 4 constituting the mask frame 2 in a propping-up manner. The mutual interval between the frame side parts 3, 4 is widened by the rotation of a nut 16 for adjusting. When the tension of the screen mask 7 is reduced, the nut 16 for adjusting is rotated at a proper amount and the reduced printing pattern part P at the central part of the mask is elongated together with the frame. As a result, the tension is held at a proper value. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  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.

  The ceramic wiring substrate is formed by laminating, pressing, and firing ceramic green sheets on which metallized ink (also referred to as metallized paste) made of a refractory metal such as tungsten is formed for forming a wiring layer. In this case, a ceramic green sheet having a size that allows a large number of wiring boards to be obtained at one time is used, and is usually divided into each wiring board unit after firing. By the way, printing of such a 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 the screen printing, as shown in FIG. 8, a ceramic green sheet (hereinafter, also referred to as a green sheet) G as a printing substrate is positioned and placed on a flat printing table 100, and a screen mask ( The mask frame 2 to which the plate 7 is attached is positioned and overlapped. Then, the ink 105 placed on the screen mask 7 is scraped or pressed with a squeegee 106, and the ink is transferred to the surface of the green sheet G to print a predetermined pattern.

  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 rectangular mask frame 2 in plan view. This mask frame (hereinafter, also simply referred to as a frame) 2 is usually formed in a frame (frame) by frame sides 3 to 6 having a square cross section so as to form a quadrangular frame, and the screen mask 7 is formed by the frame. Is attached to the lower surface while maintaining a predetermined tension. It is to be noted that the mask frame 2 is usually formed as an integrally molded product made of metal such as aluminum die-cast, or an assembling structure in which the frame sides are assembled. On the other hand, the screen mask (hereinafter, also simply referred to as a mask) 7 is formed using a thin plate made of, for example, a stainless alloy, and although not shown in detail, the edge portions are frame side portions 3 to 6 so as to wrap the frame from below. And is attached to the frame 2. In the mask 7, a print pattern portion (a region indicated by a two-dot chain line in the drawing) P is formed at the center of the mask 7 so that a desired print pattern can be obtained. Is formed in a mesh shape or a group of micropores is formed.

  By the way, when printing the ink 105 using such a screen printing mask 101, the squeegee 106 is used to press down the mask 7 to apply the ink. Has a strong tensile force. For this reason, by repeating such printing, the screen mask 7 in particular, the print pattern portion P at the center thereof is elongated, though it is minute, and the tension at the time of sticking is reduced. When the tension of the mask 7 is reduced (elongation of the mask), the print pattern portion P on the screen mask 7, that is, the infinite number of minute openings is slightly contracted due to the decrease in the tension in the free state. become. As a result, the printing precision will be reduced, for example, the print pattern will be slightly smaller, or the printing position will have an error.

  For this reason, in such screen printing, when printing requiring high accuracy, if the elongation of the screen mask 7 due to repeated printing becomes a certain amount or more even if it is a little, the mask is replaced as a mask life. , To maintain the printing accuracy. Therefore, in order to maintain high printing accuracy by such a printing method, it is necessary to frequently exchange masks. Therefore, when extremely high printing accuracy is required, such as printing metallized ink for a wiring layer or the like on a ceramic green sheet for manufacturing a ceramic wiring board, a reduction in manufacturing efficiency and an increase in manufacturing cost are required. The problem was big, such as being invited.

  The present invention has been made in view of such a problem, and the object is as follows. In other words, the tension, which is the cause of the decrease in printing accuracy due to the minute elongation of the screen mask due to repeated use, can be maintained at an appropriate value by operation with a simple mechanism, thereby increasing the printing accuracy, It is an object of the present invention to provide a technique capable of extending the life of a screen mask.

In order to achieve the above object, an invention according to claim 1 is directed to a method of screen printing on a printing substrate using a screen printing mask including a mask frame and a screen mask attached to the mask frame. ,
A screen printing mask comprising a screen mask tension adjusting means by a screw mechanism, which adjusts the tension of the screen mask by elastically deforming a frame side part constituting the mask frame outward. I do.

  According to the present invention, screen printing capable of adjusting the tension of the screen mask by elastically deforming the sides of the frame constituting the mask frame outward by means of the tension adjusting means of the screen mask by a screw mechanism in accordance with the elongation of the screen mask. A mask for use is used. For this reason, the screen printing mask can be repeatedly printed with the same screen mask and high precision by appropriately adjusting the screen printing mask without complicating the structure thereof and performing the adjustment appropriately by a simple operation. .

  A tension adjusting means for the screen mask is provided with various known screw mechanisms so as to elastically deform the frame sides constituting the mask frame outward to widen the gap between the opposing frame sides of the mask frame. What is necessary is just to embody.

  However, in the screen printing method according to the first aspect, as described in the second aspect, the tension adjusting means of the screen mask does not overlap with a print pattern portion formed substantially at the center of the screen mask in plan view. It is advisable to arrange a plurality of them. The tension adjusting means is preferably arranged substantially symmetrically at portions near 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, comprising: using a screen printing mask including a mask frame and a screen mask attached to the mask frame. When screen printing metallized ink for forming wiring layers etc. on ceramic green sheets of
A screen printing mask comprising a screen mask tension adjusting means by a screw mechanism, which adjusts the tension of the screen mask by elastically deforming a frame side part constituting the mask frame outward. I do.

  The screen printing method according to claim 1 or 2 can be applied irrespective of the printing target. However, in printing the metallized ink on the ceramic green sheet for manufacturing the ceramic wiring board, a particularly small printing error becomes a problem. Is big.

  According to a third aspect of the present invention, in the method of manufacturing a ceramic wiring board, as described in the fourth aspect, the tension adjusting means of the screen mask is formed in a print pattern portion formed substantially at the center of the screen mask in plan view. It is advisable to arrange a plurality of them so as not to overlap with them.

According to a fifth aspect of the present invention, there is provided a screen printing mask including a mask frame and a screen mask attached to the mask frame,
It is characterized by comprising a screen mask tension adjusting means by a screw mechanism, which adjusts the tension of the screen mask by elastically deforming a frame side constituting the mask frame outward.

  According to the present invention, in accordance with the elongation of the screen mask, the side of the frame constituting the mask frame is elastically deformed outward by the tension adjusting means of the screen mask by the screw mechanism, and the interval between the opposing frame sides is increased. Thus, the tension of the screen mask can be adjusted, so that high-precision printing can be performed many times without complicating the structure. In the screen printing mask according to the fifth aspect, as described in the sixth aspect, the tension adjusting means of the screen mask overlaps with a printing pattern portion formed substantially at the center of the screen mask in plan view. It is advisable to arrange a plurality of them so that they do not become inconsistent.

  As is clear from the above description, according to the present invention, the structure of the screen printing mask is not complicated, and the adjustment is appropriately performed by a simple operation. High-precision printing can be repeatedly performed. Therefore, it is possible to improve the printing accuracy and extend the life of the screen mask. Therefore, in printing metallized ink for forming a wiring layer or the like on a ceramic green sheet for manufacturing a ceramic wiring board, a remarkable effect can be obtained, and a reduction in the cost of the wiring board is expected.

  A first embodiment of a mask for screen printing according to the present invention will be described in detail with reference to FIGS. FIG. 1 is a plan view and a main part enlarged view of a screen printing mask 1 used in the method of the present invention, and FIG. 2 is a sectional view taken along line AA of FIG. 1 and a main part enlarged view. The mask frame 2 forming the screen printing mask 1 is, for example, made of aluminum and formed in a rectangular frame shape, and each of the frame sides 3 to 6 forming four sides is formed of a rod-shaped body having a substantially square cross section. . Further, the screen mask 7 is wound around the edge 7a from the lower surface (lower side surface in FIG. 2) of each of the frame sides 3 to 6 to the outer and upper surfaces 3a, 4a, 5a and 6a. Is attached to Then, at an appropriate position on the upper surface of the four frame sides 3 to 6 of the frame 2, the edge 7 a is fixed from above the screen mask 7 by screws or the like, and a certain tension is applied to the mask frame 2, and the tension state is obtained. Is held. The mask frame 2 is formed by processing to a predetermined size from an integrally molded product by die casting. Further, the screen mask 7 may be fixed to the frame sides 3 to 6 with an adhesive or the like.

  In this embodiment, a tension adjusting means for the screen mask 7 is provided for such a mask frame 2 as follows. In the present embodiment, of the frame sides 3 to 6, a vertical line passing through the center of the short sides 3 and 4 between the opposing frame sides 3 and 4 forming the short sides. Two shafts (a round bar made of SUS304 and having a diameter of, for example, 10 mm and a length of about 400 mm) 9, 9 are arranged substantially symmetrically in parallel with a predetermined interval therebetween with S interposed therebetween. Since the tension adjusting means including one shaft 9 is the same, only one of them will be described. The interval between the two shafts 9, 9 is set so as not to obstruct the movement of the squeegee while avoiding the printing pattern portion P (the rectangular area indicated by the two-dot chain line in FIG. 1) P at the center of the screen mask. I have.

  That is, in the present embodiment, the shaft body 9 described below is used for the tension adjusting means. As shown in FIGS. 1 and 2, the shaft body 9 is provided with screws (for example, M10) 10 and 10 having a fixed length (for example, 30 mm) on the outer peripheral surfaces of both ends. In this specification, the term “screw” refers to a right-hand thread. The shaft body 9 has a right end in the figure screwed into a screw hole 11 provided in the frame side part 4 and fixed by a predetermined amount. However, to prevent loosening, for example, a lock nut 12 is fastened to the inner surface of the frame side 4 on the right side in the figure. Note that the lock may be performed by pinning or the like. On the other hand, the left end of the shaft body 9 shown in the figure is passed through a straight hole 14 provided in the frame side 3 in a clearance fitting manner, and the inner surface of the frame side 3 on the left side of the figure is passed through a slip washer 15. In addition, an adjusting nut 16 constituting the tension adjusting means is screwed.

  In other words, the nut 16 for adjustment is rotated and screwed to the left in the figure, and the nut 16 for adjustment is brought into contact with the inner surface of the frame side portion 3 via the slip washer 15. Then, the screw advances to the left in the figure. Then, the opposing left and right frame sides 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, and the mutual distance between the left and right frame sides 3 and 4 is pushed. Receive the effect of being spread. As a result, the left and right frame sides 3 and 4 are elastically deformed outward as exaggeratedly indicated by a two-dot chain line in FIG. 1, so that the distance between the opposing frame sides is increased. When the frame sides 3 to 6 are made of the same material as in this embodiment and have the same cross-sectional shape and dimensions, the amount of deformation (bending amount) of each of the left and right frame sides 3, 4 is constant. Further, when the nut 16 for adjustment is rotated in the reverse direction and moved to the right in the figure (screw-back), the force applied to the side of the frame decreases, and the deformation thereof also decreases. Then, when the force becomes zero, the deformation disappears and the frame returns to its original shape and dimensions.

  The screen printing using the screen printing mask 1 according to the present embodiment is as follows. That is, when using the printing mask 1, the nut 16 for adjustment is not used at first. Then, in the same manner as in the related art, the printing mask 1 is positioned and superimposed on a printing object (for example, a ceramic green sheet for manufacturing a wiring board) placed on a printing table. The metallized ink is printed on the print pattern portion P of the screen mask 7 located between the shafts 9 and 9. Then, 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 nut 16 for adjustment in the two shafts 9, 9 is appropriately rotated by a small amount to the left by an amount corresponding to the contraction. By doing so, the frame sides 3, 4 are stably elastically deformed outward, so that the screen mask 7 is also pulled in the same direction, and the 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 the dimensional accuracy with respect to the printing object are maintained.

  Thus, in response to the decrease in the tension of the screen mask 7, the screen mask 7 can be stretched together with the mask frame 2 by rotating the adjustment nut 16 every certain number of printings, so that the screen can be stretched. The tension of the mask 7 can be maintained at a predetermined value by a simple operation without complicating the structure of the printing mask. That is, a decrease in printing accuracy due to the elongation of the screen mask 7 due to repeated use can be prevented without complicating the structure, and the number of times that one screen mask can be used to print can reduce the printing cost. It is planned.

  The amount of screwing of the adjusting nut 16 for elastically deforming each frame side outward is determined by the pitch of the screw 10 and the number of rotations (rotation angle) of the adjusting nut 16. When it is desired to set the distance between the frame sides 3 and 4 at the position of the shaft body 9 to 0.5 mm, the adjustment nuts 16 of the two shaft bodies 9 may be rotated by 180 degrees. As described above, the interval between the frame sides can be widened by a desired amount depending on the rotation angle or the number of rotations of the adjusting nut 16, so that the tension of the screen mask 7 can be easily adjusted. In addition, since the elongation of the screen mask 7 is very small, and the amount of adjustment at one time is also as small as about 5 to 10 μm, it is preferable to select screws with a pitch as small as possible.

  By the way, when printing a metallized ink for a wiring layer or the like on a ceramic green sheet, if a conventional screen printing mask is used, the printing pattern portion caused by the expansion of the screen mask is printed about 1000 times. Reduction became a problem, and the screen mask could not be used. On the other hand, when the screen printing mask of the present embodiment is used, the interval between the frame sides 3 and 4 is widened by about 5 to 10 μm every 1000 printings, to about 4000 times. I was able to increase the number of prints.

  The means for adjusting the tension of the screen mask 7 by the screw mechanism in the present invention is not limited to the above embodiment. This means uses various well-known screw mechanisms so as to elastically deform the frame sides constituting the mask frame 2 outward to widen the gap between the opposing frame sides 3, 4 of the mask frame 2. it can.

  FIG. 3 shows another embodiment of the screen printing mask 21, but the tension adjusting means of the screen mask 7 by a screw mechanism is different from that of the above-described embodiment, and other configurations are different. Therefore, only different points will be described, and the same portions will be denoted by the same reference numerals. That is, the same screw hole 11 as described above is provided in the opposing right side of the frame 4, and a long bolt 29 is screwed into the screw hole 11, and the left side of the left side of the frame 3 whose tip 29 a faces the same. So that it contacts the inside surface. However, the lower length L of the head 29b of the long bolt 29 is between the outer surface of the frame side 4 on the right side in the figure and the head 29b when the tip 29a is in contact with the inner surface of the frame side 3. In addition, a lock nut 12 can be interposed and a length that allows for a necessary adjustment amount must be used. A plurality of long bolts 29 serving as a tension adjusting means are symmetric with respect to the central horizontal line S in FIG. 3, for example, avoiding overlapping with the printed pattern portion P formed substantially in the center of the screen mask 7 in plan view, as in the above-described embodiment. It is preferable to arrange them.

  In this case, when the tension of the screen mask 7 is reduced, the lock nut 12 is loosened, and the head (or the handle provided at the tip portion) 29b of the long bolt 29 is appropriately adjusted in accordance with the decrease. What is necessary is just to rotate and tighten. In this case, for example, the distal end 29a of the long bolt 29 slightly enters the inner surface of the frame side portion 3 on the left side in the drawing so that the axis of the long bolt 29 is not displaced. It is good to provide a concave part like this. When using a screw that does not loosen the long bolt 29 even without the lock nut 12, the lock nut is of course unnecessary.

  FIG. 4 shows still another embodiment of the screen printing mask 71, but only the tension adjusting means of the screen mask 7 is different, and the other configuration is the same as that of the first embodiment. Since there is no difference from the above, only the differences will be described, and the same portions will be denoted by the same reference numerals. In this example, a screw hole 11 similar to that provided in the right frame side 4 in FIG. 1 is provided in the opposite frame left side 3 in the figure, and the inner surface of the frame side 3 is provided in the screw hole 11. From there, a short adjustment bolt 29 having a recess 29c in the center of the end face of the head 29b is screwed. On the other hand, a concave portion 39c is also formed on the inner surface of the opposing right side of the frame side 4 in the drawing. For example, a round bar (circular shaft) 39 is interposed between the concave portions 29c and 39c in a vertical and protruding manner at the frame sides 3 and 4 facing each other. With this configuration, when the adjusting bolt 29 is unscrewed (progressed to the right in the drawing), it becomes strongly stretched, and the opposing frame sides 3 and 4 constituting the mask frame 2 are elastically deformed outward. It deforms, and the space between the frame sides is widened. Thus, the tension of the screen mask 7 attached to the frame 2 is adjusted. Also in this case, if necessary, the lock nut 12 may be screwed as shown by a two-dot chain line in the figure.

  FIG. 5 shows still another screen printing mask 41, but only the tension adjusting means of the screen mask 7 is different, and the other configuration is different from the first embodiment. Therefore, only the differences will be described, and the same portions will be denoted by the same reference numerals. This is configured as follows. Nut members 42 and 43 forming left and right reverse screws are welded at positions inside the opposing frame sides 3 and 4 and parallel to a straight line S passing through the centers of the frame sides 3 and 4 in plan view. Are fixed coaxially (line). For example, a right-handed nut member 42 is fixed to the inner surface of the left frame side 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 4. However, in the frame sides 3 and 4, through holes 14 which are coaxial with the axes of the nuts 42 and 43 and larger than the screw diameter are formed. Then, shaft members 49 and 50 having a screw screwed to each of the nut members 42 and 43 at the distal end are prepared, and as shown in FIG. Screw an appropriate amount to. However, the base ends of the left and right shaft members 49 and 50 (portions closer to the center in the left and right in the figure) are connected by the connecting member 51 so that the two shaft members 49 and 50 can be simultaneously rotated in the same direction. For example, a straight connecting hole 44 is formed in the connecting member 51 so as to penetrate both ends thereof, and base ends of both shaft members 49 and 50 are inserted into the connecting hole 44 from each end of the connecting member 51. Then, screws at the tips of the shaft members 49 and 50 are screwed into the nuts 42 and 43 in an appropriate amount. Then, a pin 53 is driven into the connecting member 51 and fixed so as to penetrate in the radial direction of each base end of the both shaft members 49 and 50. In the present embodiment, it is sufficient that the two shaft members 49 and 50 can be rotated together by rotating the connecting member 51 around the axis. Therefore, the connecting members 51 may be fixed with set screws instead of driving the pins. With this configuration, when the connecting member 51 is rotated to one side, the space between the opposing frame sides 3 and 4 is separated or approached by the reverse screw mechanism. 7 tension can be adjusted.

  In each of the above-described embodiments, the case where the tension adjusting means having the screw axis is provided in an arrangement perpendicular to the short side of the frame constituting the mask frame is exemplified. Is not limited to such a screw shaft arrangement. Depending on the reduction in the tension of the mask, a tension adjusting means having a screw axis may be provided so as to be perpendicular to 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 either vertically or horizontally. In each of the above embodiments, when stretching of the screen mask between the opposing frame sides forming the long side also becomes a problem, that is, when two-dimensional stretching in both the vertical and horizontal directions of the frame becomes a problem, the long side is used. The tension adjusting means of each of the above forms may be provided between the opposing frame sides. The same applies to a square mask frame. In other words, although not shown, the tension adjusting means may be arranged so as to have a cross-girder shape (a shape of a “well”) in a plan view of the mask frame. In the case of the rectangular frame structure having a rectangular shape in plan view as in each of the mask frames described above, when the opposing frame sides forming the short sides bend outward, the opposing frame sides forming the long sides are bent inward on the contrary. I get stuck. For this reason, when the inward bending of the opposing frame sides forming the long sides poses a problem, the tension adjusting means may be arranged in a grid.

  Further, when the mask frame is rectangular in plan view, as in the screen printing mask 51 shown in FIG. The bolt 59 may be arranged. That is, in the four corners, a screw hole 51 is formed in a portion near one corner of one frame side at a corner in a plan view, for example, at an angle of 45 degrees, and a bolt 59 is screwed into the screw hole 51 so that its tip is adjacent to the adjacent frame side. The inner surfaces of the parts 3 and 4 are to be brought into contact with each other. With such a configuration, by screwing in each bolt 59, the distance between both the frame sides 3 and 4 forming the short side and between the frame sides 5 and 6 forming the long side can be enlarged and adjusted. , And can cope with both vertical and horizontal two-dimensional expansion of the screen mask 7. A concave portion 59c is provided on the inner side surface of each of the frame sides 3 and 4 with which the distal end of the bolt 59 contacts, and if the distal end of the bolt 59 is inserted into the concave portion 59c, the distal end does not escape. preferable. In the figure, reference numeral 12 denotes a lock nut. In order to stabilize the lock nut 12, a convex portion 59d having a seating surface of the lock nut 12 perpendicular to the axis of the bolt 59 may be provided outside the screw hole 51.

  In each embodiment of the screen printing mask described above, the tension adjusting means of the screen mask is arranged inside the mask frame so as to spread the frame side outward, but the tension adjusting means of the screen mask is It can also be arranged outside the mask frame so that the sides of the frame are extended outward.

  FIG. 7 shows an embodiment of the screen printing mask 61 thus embodied. In other words, the screen printing mask 61 has a double frame structure in which an outer frame 62 having a higher strength than the mask frame 2 is arranged outside the mask frame 2 while maintaining an interval. However, a shaft 69 having a screw formed at a position near the front end is formed on the outer surface of each of the opposing frame sides 3 and 4 forming the short side of the mask frame 2 so that the screw is positioned on the front end side. The base end side (mask frame 2 side) is fixed by screwing or welding. However, in this embodiment, two shaft bodies 69 are fixed at right and left sides of the frame sides 3 and 4 vertically to the outer surfaces thereof. The outer frame 62 is provided with a straight hole 64 through which the forward end portion of the shaft 69 penetrates, and is disposed so that the forward end portion of the shaft 69 projects from the straight hole 64. Adjustment nuts 66 are screwed onto the screws at the positions near the front end.

  Thus, for example, by tightening the two adjustment nuts 66 on the left side, the frame sides 3, 4 forming the short sides of the mask frame 2 can be elastically deformed so as to bend outward. Thereby, similarly to the embodiment of FIG. 1, the reduction of the print pattern portion P caused by the extension (reduction of tension) of the screen mask 7 can be eliminated. In such a double frame structure, the outer frame 62 has a cross-sectional shape and a dimension as high as possible (high rigidity) as compared with the mask frame 2 forming the inner frame so as not to be substantially deformed. Preferably, In the case where the frame sides forming the mask frame are extended from the outside of the mask frame 2 as described above, the same tension adjusting means of the screen mask is provided between the frame sides 5 and 6 forming the long sides. Can be provided.

  In the present invention, the means for adjusting the tension of the screen mask by the screw mechanism is arranged inside the frame side portion, and the screw or the bolt formed on the nut or the shaft body, or the bolt is rotated around the axis thereof, so as to face each other. Various known screw mechanisms configured so that the intervals between the frame sides are in a stretched state can be used. Further, in the case where the screw is formed on the outside of the frame (frame side), a nut formed on the shaft or the like is relatively rotated around its axis, so that the interval between the opposing frame sides is set from the outside. Any known screw mechanism that can be extended can be used.

  As described above, the screen printing mask according to the present invention is not limited to the above-described embodiment, and can be appropriately designed and embodied without departing from the gist of the present invention. The screen printing mask is usually formed on the basis of a mask frame having a substantially square shape in a plan view, but the present invention can also be embodied in a polygonal mask frame which cannot be said to be a square. The screen printing method using the screen printing mask of the present invention is not limited to the ceramic green sheet, and can be applied to various printing materials.

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 line AA of FIG. 1 and an enlarged view of a main part. FIG. 3 is a plan view showing another embodiment of the tension adjusting means of the screen mask, and an enlarged view of a main part. The top view and the principal part enlarged view which showed another form of the tension adjustment means of the screen mask. The top view and the principal part enlarged view which showed another form of the tension adjustment means of the screen mask. FIG. 9 is a plan view showing still another form of the tension adjusting means of the screen mask. FIG. 9 is a plan view showing still another form of the tension adjusting means of the screen mask. FIG. 4 is a conceptual diagram illustrating conventional screen printing. The top view of the mask for screen printing used for the conventional screen printing.

Explanation of reference numerals

1, 21, 31, 41, 51, 61 Screen printing mask 2 Mask frame 3, 4, 5, 6 Frame side 7 Screen mask P Print pattern portion G Green sheet (substrate)

Claims (6)

In a method of screen printing on a substrate using a mask frame and a screen printing mask comprising a screen mask attached to the mask frame,
A screen printing mask comprising a screen mask tension adjusting means by a screw mechanism, which adjusts the tension of the screen mask by elastically deforming a frame side part constituting the mask frame outward. Screen printing method.   2. The screen printing method according to claim 1, wherein a plurality of the screen mask tension adjusting means are disposed so as not to overlap with a print pattern portion formed substantially at the center of the screen mask in plan view. 3. Using a mask for screen printing comprising a mask frame and a screen mask attached to the mask frame, a metallized ink for forming a wiring layer and the like is formed on a ceramic green sheet for manufacturing a ceramic wiring board. For screen printing,
A screen printing mask comprising a screen mask tension adjusting means by a screw mechanism, which adjusts the tension of the screen mask by elastically deforming a frame side part constituting the mask frame outward. To manufacture a ceramic wiring board.   4. The ceramic wiring board according to claim 3, wherein a plurality of the tension adjusting means of the screen mask are arranged so as not to overlap with a printed pattern portion formed substantially at the center of the screen mask in plan view. Manufacturing method. In a mask for screen printing, comprising a mask frame and a screen mask attached to the mask frame,
A screen printing mask, comprising: a screen mask tension adjusting means by a screw mechanism, which adjusts the tension of the screen mask by elastically deforming a side of the frame constituting the mask frame outward. 6. The screen printing mask according to claim 5, wherein a plurality of the screen mask tension adjusting means are arranged so as not to overlap with a print pattern portion formed substantially at the center of the screen mask in plan view. .

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