JP3456057B2 - Screen printing screen alignment method and screen printing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen printing screen alignment method and a screen printing method.

[0002]

2. Description of the Related Art A screen printing method is used in various technical fields. In general, a screen for screen printing is composed of a rectangular screen frame and a screen member attached to the screen frame and having a pattern to be printed formed thereon. Usually, it is difficult to accurately attach the screen member to the screen frame. Therefore, at least two alignment marks are formed on the screen member.

The relative position of the alignment mark formed on the screen member with respect to the screen frame often differs from screen to screen even if the screen has the same pattern. It is extremely difficult to attach the screen member to the screen frame with high accuracy,
This is because the relative position of the alignment mark with respect to the screen frame also changes due to the tension when the screen member is attached to the screen frame.

Therefore, when the overlay printing is performed by the screen printing method, the alignment mark is also printed at the same time when the pattern is printed. Then, when the next pattern is printed by using another pattern or another screen on which the same pattern is formed, the alignment mark formed on the other screen is the alignment mark (alignment mark already printed). Position of the screen attached to the screen printing machine (including the marks formed on the substrate) corresponding to the above. Alternatively, for example, the alignment mark already printed on the printing medium placed on the printing table provided with the XY stage of the screen printing machine is optically read, and the position of the printing table is adjusted based on the result. . By such a method, it is possible to prevent positional deviation between printed patterns.

[0005]

However, in such a conventional adjustment method using the alignment mark, the alignment mark is printed in superposition every time it is printed. As a result, the alignment mark is often blurred or distorted. In addition, the alignment mark may not be printed due to foreign matter such as dust on the screen. In order to solve such a problem, there are a method of gradually reducing the size of the alignment mark to be overlaid and a method of forming a preliminary (dummy) alignment mark on the screen member in advance. Method is not a viable solution.

Further, it is a skill to adjust the position of the screen attached to the screen printing machine so that the alignment mark formed on the screen member is located on the already printed alignment mark. This is a required work and a time-consuming work. Moreover, such work must be performed every time the screen is replaced, and this leads to a reduction in the operating rate of the screen printing machine. In addition, the work of adjusting the position of the printing object placed on the printing table of the screen printing machine causes an increase in printing time of 10 to several tens of seconds per printing, and thus the structure of the screen printing machine is increased. Has the problem of being complicated.

Accordingly, it is an object of the present invention to eliminate the need for printing alignment marks formed on screen members,
Moreover, when the screen is attached to the screen printing machine, the alignment mark formed on the screen member can be always positioned at a predetermined position of the screen printing machine, and the alignment of the screen after the screen is attached to the screen printing machine Or a method for aligning a screen for screen printing, which can eliminate the need for position adjustment of an object to be printed placed on a printing table of a screen printing machine. To provide.

[0008]

A method for aligning a screen printing screen according to the present invention for achieving the above-mentioned object is (a) a rectangular screen frame, and (b) printing attached to the screen frame. A pattern member to be formed and at least two alignment marks, and (c) at least two on one side of the screen frame and at least one on one side of the screen frame orthogonal to the one side. A method for aligning a screen printing screen for aligning the alignment mark at a predetermined position in a screen for printing, which comprises an alignment jig, comprising: (A) a position formed on the screen member; Alignment marks associated with each of the alignment marks are provided at predetermined positions, and
Place the screen on the adjustment table provided with an engaging portion that engages with each of the positioning jigs arranged on the screen so that the engaging portion and the positioning jig engage with each other.
(B) The displacement between the position of the alignment mark formed on the screen member and the position of the alignment mark provided on the adjustment base is measured, and (C) the displacement is arranged on the screen so as to minimize the displacement. It is characterized in that the provided positioning jig is adjusted.

The screen printing method of the present invention for achieving the above-mentioned object is (a) a rectangular screen frame, (b) a pattern part to be printed and at least two alignment marks attached to the screen frame. For screen printing, which comprises: a screen member having the above-mentioned structure; and (c) at least two on one side of the screen frame, and at least one on one side of the screen frame orthogonal to the one side, and a positioning jig arranged. Using a screen, (A) alignment marks associated with each of the alignment marks formed on the screen member are provided at predetermined positions, and engage with each of the alignment jigs arranged on the screen. On the adjustment table provided with the engaging portion to be mounted, put the screen so that the engaging portion and the alignment jig engage,
(B) The displacement between the position of the alignment mark formed on the screen member and the position of the alignment mark provided on the adjustment base is measured, and (C) the displacement is arranged on the screen so as to minimize the displacement. After adjusting the provided alignment jig, and thereby aligning the alignment mark formed on the screen member to a predetermined position, (D) engages with the alignment jig arranged on the screen. The screen printing is performed after the screen is attached to the screen printing machine provided with the engaging portion such that the engaging portion and the positioning jig are engaged with each other.

The screen member can be made of wood, metal such as aluminum, iron, stainless steel and the like. The screen member can be made of silk cloth, polyester cloth, stainless steel mesh, metal plate having a pattern formed by etching or the like. The screen member may be attached to the screen frame by a known method. The shape of the alignment mark formed or provided on the screen member or the adjustment table has a cross line, a circle, etc.
It can have any shape. The present invention is in the printing field,
It can be applied to various printing fields, printed wiring board manufacturing fields, various electronic component manufacturing fields, various adhesive application fields, and the like. For example, in the field of manufacturing printed wiring boards, printing of resist ink for etching and plating, printing of solder resist, printing of marking ink, etc. In the field of manufacturing various electronic components, printing of conductive paste, resistance paste Printing, various adhesives, frit materials, application and formation of ceramic materials, shaping, and the like.

[0011]

According to the present invention, after the information about the alignment mark is aligned with the predetermined position while the screen is placed on the adjusting table, the position of the screen for screen printing is determined based on this information. Since the alignment mark is aligned at a predetermined position, the position of the screen attached to the screen printing machine is always constant, and it is not necessary to align the screen after the screen is attached to the screen printing machine. Further, it is possible to eliminate the need for adjusting the position of the printing object placed on the printing table of the screen printing machine. Furthermore, it is not necessary to print the alignment mark formed on the screen member.
Since the adjustment of the screen for screen printing is performed using the adjustment stand independent of the screen printing machine, the operation rate of the screen printing machine is not lowered.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described based on embodiments with reference to the drawings.

FIG. 1A is a schematic perspective view of the screen printing screen alignment method of the present invention or the screen printing screen 10 (hereinafter simply referred to as screen 10) in the screen printing method of the present invention. )
Shown in. The screen 10 is a rectangular screen frame 11
And a screen member 12 and a positioning jig 15. The screen member 12 is the screen frame 1
1, a pattern portion 13 to be printed and at least two (two in the embodiment) alignment marks 14 are formed by being attached by, for example, welding. The screen member 12, the screen frame 11, and the screen 10 can be manufactured by a known method.

In the embodiment, two alignment jigs 15 are provided on one side of the screen frame 11 substantially parallel to the line connecting the two alignment marks 14. Incidentally, these alignment jigs are indicated by reference numerals 15A and 15B. Further, one is provided on one side of the screen frame 11 orthogonal to this one side. Note that this alignment jig is indicated by reference numeral 15C. Details of the alignment jig 15 are shown in FIG.
(B) is a schematic view with a part cut away. The alignment jig 15 includes the protrusion 1 fixed to the screen frame 11.
6, a through hole 17 provided in the protrusion 16, a lock nut 18 fixed to the protrusion 16, and an abutment bolt 19 screwed with the lock nut 18. By rotating the butting bolt 19, the screen frame 1
The distance from the outer side wall of No. 1 to the tip 19A of the butting bolt 19 can be changed.

FIG. 2A shows a perspective view of the screen printing screen alignment method of the present invention or the adjustment table 20 used in the screen printing method of the present invention. The adjusting table 20 includes engaging portions 21A, 21B, and 21C that engage with the positioning jigs 15A, 15B, and 15C arranged on the screen 10 (hereinafter, collectively referred to as the engaging portion 21). Is provided).
The adjustment table 20 and the engaging portion 21 may be made of, for example, stainless steel or steel. Further, the alignment marks 22 related to the alignment marks 14 formed on the screen member 12 are provided at predetermined positions at two places in the embodiment,
It is provided. The adjusting table 20 may be provided with a plurality of semi-cylindrical or hemispherical projections (not shown) so that the screen frame 11 moves smoothly on the adjusting table 20. still,
Above each of the alignment marks 22, a device for optically detecting the positions of the alignment marks 14 and 22, for example, a CCD camera 23 is arranged.

The method of aligning the screen for screen printing and the method of screen printing according to the present invention using the screen 10 shown in FIG. 1 and the adjusting table 20 shown in FIG. 2A will be described below.

Using the CCD camera 23, the coordinates of the position of the alignment mark 22 provided on the adjusting table 20 are obtained in advance. When the screen 10 is placed on the adjustment table 20, the alignment mark 1 formed on the screen 10
The distance from 4 to the CCD camera 23 and the distance from the alignment mark 22 provided on the adjustment base 20 to the CCD camera 23 are significantly different, and the alignment marks 14 provided on the screen 10 and the adjustment base 20 are provided. When it is difficult to observe the alignment mark 22 with the CCD camera 23, it is preferable to measure the position coordinates with the CCD camera 23 using the master screen 30 shown in the perspective view of FIG. Master screen 30
Is made of metal, has an engaging portion 31, and has an alignment mark 32. Master screen 30
When the engaging portion 31 of the master screen 30 is engaged with the engaging portion 21 of the adjusting table 20,
The alignment mark 32 formed on the master screen 30 is located directly above the alignment mark 22 provided on the adjustment table 20. In addition, the screen 10
When the master screen 30 is placed on the adjusting table 20, the distance from the alignment mark 14 formed on the screen 10 to the CCD camera 23 becomes equal to the distance from the alignment mark 32 to the CCD camera 23. Thus, the thickness of the master screen 30 is selected.

On the other hand, the abutting bolts 19 of the abutting bolts 19 of the respective positioning jigs 15 arranged on the screen 10 are adjusted so that the distance from the tip 19A of the abutting bolts 19 to the outer side wall of the screen frame 11 becomes a predetermined amount. Adjust the position.

Then, after the coordinates of the position of the alignment mark 22 (or 32) provided on the adjusting table 20 (or the master screen 30) are obtained, they are respectively engaged with the engaging portions 21A, 21B and 21C of the adjusting table 20. Screen 1
Positioning jigs 15A, 15B, 15C arranged at 0
The screen 10 is placed on the adjustment table 20 so that the respective members engage with each other. This state is shown in the schematic plan view of FIG. The engaging portion 21 of the adjusting table 20 and the screen 10
In order to maintain a constant engagement state with the alignment jig 15 disposed on the screen, a biasing means (not shown), such as a pressing spring, that biases the screen 10 toward the engaging portion 21. ) Is preferably provided on the adjusting table 20.

The position of the abutment bolt 19 is adjusted in advance so that the distance from the tip 19A of the abutment bolt 19 in the alignment jig 15 arranged on the screen 10 to the outer side wall of the screen frame 11 is a predetermined amount. Therefore, the distance from the outer side wall of the screen frame 11 to the engaging portion 21 of the adjustment table 20 is constant regardless of the screen 10.

Next, the displacement between the position of the alignment mark 14 formed on the screen member 12 and the position of the alignment mark 22 provided on the adjusting table 20 is measured.
Specifically, since the position coordinates of the alignment mark 22 provided on the adjusting table 20 have already been obtained, the adjusting table 20
The position coordinates of the alignment mark 14 formed on the screen member 12 of the upper screen 10 may be obtained by the CCD camera 23. In addition, in FIG.
The alignment mark 22 provided on the above is indicated by a dotted cross line.

After that, the screen 10 is removed from the adjusting table 20, and the alignment jig 15 is arranged on the screen 10 so that the displacement is minimized based on the measurement result of the displacement.
Adjust A, 15B and 15C. Positioning jig 15
To adjust A, 15B, and 15C, specifically, rotate the butting bolt 19 by a certain amount to adjust the distance from the outer side wall of the screen frame 11 to the tip 19A of the butting bolt 19 in the alignment jig 15. It can be done by adjusting. In this way, the alignment of the screen 10 is completed. The amount of rotation of the butting bolt 19 can be determined using, for example, a personal computer. A method of determining the rotation amount of the butting bolt 19 will be described later.

After that, the screen 10 whose alignment has been completed is moved to the alignment jig 1 mounted on the screen 10.
The screen 10 is attached to the screen printing machine 40 provided with the engaging portion 41 that engages with the engaging member 41 so that the engaging portion 41 and the alignment jig 15 engage with each other. Then, as shown in the schematic diagram in which a part of FIG. 4 is cut away, a printing material 45 such as ink or paste is screen printed using a squeegee 43 on a printing object 44 placed on the printing table 42. .

The method of determining the rotation amount of the butting bolt 19 will be described below. First, the symbols and coordinates will be described with reference to FIG. Although the positioning jigs 15A to 15C arranged on the screen frame differ from the state shown in FIG. 1 in the following description, this is not essential.

In FIG. 5, a rectangle 11A means an outer side wall of the screen frame 11. Also, arrows 190A and 19
0B and 190C mean portions of the butting bolt 19 protruding from the outer side wall of the screen frame 11. In addition, the abutment bolt 19 is adjusted so that the distance from the tip 19A of the abutment bolt 19 in the alignment jigs 15A and 15B arranged on the screen 10 to the outer side wall of the screen frame 11 becomes a predetermined amount (a). Adjust the position in advance. In addition, a positioning jig 15C arranged on the screen 10
The position of the butting bolt 19 is adjusted so that the distance from the tip 19A of the butting bolt 19 to the outer side wall of the screen frame 11 is a predetermined amount. In this case,
Alignment jig 1 from the midpoint A of points M ₁ and M ₂ described below
The distance to the tip 19A of the butting bolt 19 at 5C is b. In addition, the alignment jigs 15A, 15B, 1
Center axis of butting bolt 19 and rectangle 11A at 5C
Intersection points are called points R ₁ , R ₂ and R ₃ , respectively, and the tips 19A of the butting bolts 19 are called points R ₁ ′, R ₂ ′ and R ₂ respectively.
Call it ₃ '. For the sake of convenience, the straight line connecting the points R ₁ and R ₁ ′ and the straight line connecting the points R ₂ and R ₂ ′ are respectively points M ₁
And M ₂ respectively, and the straight line connecting the point R ₃ and the point R ₃ ′ passes both the points M ₁ and M ₂ , but is not limited to this.

The line segments 21A, 21B and 21C mean the surfaces of the engaging portions 21 of the adjusting table which engage with the tips 19A of the protruding butting bolts 19. Points M ₁ and M ₂ that are the intersections of the cross lines
Means the alignment mark 22 provided on the adjusting table. The points P ₁ and P ₂ mean the alignment marks 14 formed on the screen member 12. The direction connecting the points M ₁ and M ₂ is the x direction, and the direction orthogonal to the x direction is the y direction. The distance from the points M ₁ to M ₂ is L. Point P ₁
And the point M ₁ are related to each other, the point P ₂ and the point M ₂ are related to _each other, and the deviation between the point P ₁ and the point M _{1 and} the deviation between the point P ₂ and the point M ₂ are minimized. The rotation amount of the back bolt 19 is determined.

The point deviation amount of P ₁ and the point M _1, in the x-direction in the x _1, y-direction is y _1. In addition, (x ₁ , y ₁ )
The symbols are as shown in FIG. The amount of deviation of the point P ₂ and the point M _2, in the x-direction in the x _2, y-direction is y _2. The symbols (x ₂ , y ₂ ) are as shown in FIG. The values of (x ₁ , y ₁ ) and (x ₂ , y ₂ ) can be obtained by the CCD camera 23, as described above.

The straight line connecting the points P ₁ and P ₂ is inclined by the angle θ with respect to the x direction. Here, θ can be calculated by tan θ = (y ₁ −y ₂ ) / (L−x ₁ −x ₂ ) formula (1).

Next, a straight line in the y direction passing through the point M ₁ and the point P ₁
And the coordinate of the point Q ₁ which is the intersection of the straight line connecting the point P ₂ and
The coordinates of the point Q ₂ which is the intersection of the y-direction straight line passing through the point M ₂ and the straight line connecting the points P ₁ and P ₂ are calculated.
The coordinates of the points Q ₁ and Q ₂ are Q ₁ (x ₁ ', y ₁ '), Q
₂ (x ₂ ', y ₂ '). y ₁ '= y ₁ + x ₁ · tan θ formula (2) y ₂ ' = y ₂ −x ₂ · tan θ formula (3)

Here, the average Y ₀ of the differences between y ₁ 'and y ₂ ' is obtained. _{Y 0 = (y 1 '-y} 2') / 2 Equation (4)

The point Q ₁ is moved by -Y ₀ in the y direction, and at the same time,
If the point Q ₂ is moved Y ₀ in the y direction, this operation is
As shown in FIG. 6 (A), equal to the angle -θ only point Q ₁ and the point Q ₂ around the point B is the midpoint of the point Q _1, the point Q ₂ is rotated. By such an operation, the points P ₁ and P ₂
The straight line connecting the points is parallel to the straight line connecting the points M ₁ and M ₂ .

The distance Y ₀ 'between the point A and the point B can be obtained from Y ₀ ' = (y ₁ '+ y ₂ ') / 2 equation (5).

Accordingly, the points P ₁ and P ₂ are angled about the point B as an angle −
If it is rotated by θ and then translated by the distance Y ₀ ′, the straight line connecting the points P ₁ and P ₂ will overlap with the straight line connecting the points M ₁ and M ₂ . Such an operation is equivalent to the formula shown below. _{S 1 = -Y 0 -Y 0 '} = -y 1' formula _{(6) S 2 = Y 0} -Y 0 '= -y 2' (7)

That is, from equations (6) and (7), FIG.
As shown in FIGS. 8 and 9, the point Q ₁ is moved along the y direction by S ₁
= −y ₁ ′ (see FIG. 7), and at the same time moving point Q ₂ by S ₂ = −y ₂ ′ (see FIG. 7) along the y direction, points P ₁ and P ₂ The straight line connecting the _two points overlaps the straight line connecting the points M ₁ and M ₂ (see FIG. 8). Therefore, the above S ₁ and S ₂
The rotation amount of the butting bolt 19 in the alignment jigs 15A and 15B may be calculated so that the tip 19A of the butting bolt 19 moves by an amount corresponding to

That is, centering on the point B, the points R ₁ , R ₁ ',
Rotate R ₂ and R ₂ 'by an angle -θ, and then move Y in the y direction.
Each point r ₁ when translated by ₀ ',
The coordinates of r ₁ ′, r ₂ and r ₂ ′ are calculated (see the solid and dotted arrows in FIG. 8). Then, the advance amount of the tip end 19A per rotation of the butting bolt 19 is obtained in advance, and it corresponds to the straight line connecting the points r ₁ and r ₁ ′ and the engaging portion 21A provided on the adjusting table 20. Line segment 21A showing the surface
The intersection point r ₁ ″ (see FIG. 8) and the distance to the point r ₁ are calculated, and the abutment bolt 19 in the alignment jig 15 </ b> A may be rotated so as to obtain this distance. The straight line connecting the point r ₂ and the point r ₂ 'and the adjustment table 20
Segment 21 showing a surface corresponding to the engaging portion 21B provided on the
The distance from the intersection point r ₂ ″ with B (see FIG. 8) to the point r ₂ is calculated, and the abutment bolt 19 in the alignment jig 15B may be rotated so as to obtain this distance.

Next, the points P ₁ and P ₂ are angled about the point B by −θ.
Consider the movement of the point R ₃ ′, which is the tip of the alignment jig 15C, when it is rotated by only the position. As shown in the enlarged view of FIG. 6B, the point R ₃ ′ moves to r ₃ ′ after the point B is rotated by the angle −θ. If the angle formed by the straight line connecting point A and point R ₃ 'and the line connecting point B and point R ₃ ' is θ ', then θ'is tan θ' = (-Y ₀ '/ b) Equation (8) Is. On the other hand, the angle formed by the straight line connecting the point B and the point R ₃ ′ and the straight line connecting the point B and the point r ₃ ′ is θ. Therefore, point B
DOO point r ₃ distance L ₃ 'of a straight line connecting the from r ₃ "point of intersection between the line segment 21C point r ₃ of a surface corresponding to the engaging portion 21C provided on the adjustment base 20' until, L ₃ = - {b / cos (θ -θ ') - b / cosθ'}. equation becomes (9) the L ₃ can be obtained by calculation.

Further, the points P ₁ and P ₂ are angled with respect to the point B as an angle −θ.
When it is rotated by only, the midpoint C of the points P ₁ and P ₂ moves to the point C ′. The shift X _{0 in} the x direction from the point B to the point C ′ is X ₀ = (x ₁ −x ₂ ) / 2 Expression (10) Therefore, the component L ₃ ′ of X ₀ along the straight line connecting the point B and the point r ₃ ′ becomes L ₃ ′ = X ₀ · cos (θ−θ ′) equation (11). This L ₃ 'can be calculated.

Therefore, (L ₃ −L ₃ ′) The value of the equation (12) is calculated, and the positioning jig 15 C is moved so that the tip 19 A of the butting bolt 19 is moved by an amount corresponding to this value. The amount of rotation of the abutment bolt 19 at the above may be obtained.

The above alignment jigs 15A, 15B, 1
By the adjustment of 5C, the alignment mark 14 formed on the screen member 12 is aligned with the alignment mark 22 provided on the adjustment base 20 when the distance from P ₁ to P ₂ is equal to L. Even if the distance from P ₁ to P ₂ is not equal to L, the deviation between the position of the alignment mark 14 formed on the screen member 12 and the position of the alignment mark 22 provided on the adjustment base 20. Is the minimum.
When the screen 10 thus aligned is attached to the screen printing machine 40, the alignment mark 14 formed on the screen member 12 and the adjustment table 20 are attached.
Since the relative positional relationship with the position of the alignment mark 22 provided on the screen is always constant, the screen printing machine 40 does not depend on the screen 10 with respect to the screen printer 40.
The alignment mark 14 of is always aligned at the same position.

The present invention has been described above based on the preferred embodiments, but the present invention is not limited to these embodiments. The structure of the positioning jig described in the embodiments is an example and can be changed as appropriate. If the processing accuracy of the screen frame is high and the screen frame is always placed at the same position on the adjusting table when the screen is placed on the adjusting table, engage the engaging part of the adjusting table with the alignment jig. The screen may be placed on the adjustment table without being allowed. That is,
For example, if the adjustment base 20 is provided with a positioning jig and the outer side wall of the screen frame 11 is always arranged at a fixed position on the adjustment base, it is not necessary to previously adjust the position of the butting bolt 19. Is.

In the embodiment, two alignment marks are used.
However, the screen printing screen may be aligned based on three or more alignment marks.
In this case, the plurality of alignment marks formed on the screen member are divided into groups, and the position between the alignment marks in one group and the position of the alignment marks provided on the associated adjustment base are displaced. Is calculated, and the rotation amount of the butting bolt may be calculated based on the average value. The number of alignment jigs is not limited to three and may be four or more. Further, in the embodiment, two alignment jigs are arranged on the screen frame along the x direction, and y
Although one alignment jig is arranged in the screen frame along the direction, for example, one alignment jig is arranged in the screen frame along the x direction and two alignment jigs are arranged along the y direction. The tool may be arranged on the screen frame. Also in this case, the rotation amount of the butting bolt 19 may be determined by a method substantially similar to that described in the embodiment.

In the embodiment, the rotation amount of the butting bolt is obtained by calculation, the screen 10 is removed from the adjusting base 20, and then the butting bolt is rotated to align the screen. The screen printing screen alignment method and the screen printing method are not limited to the embodiments.

For example, the adjusting table may have a structure in which an XY table movable in the x direction and the y direction is placed on the adjusting table. In this case, the screen 10 is placed at a predetermined position on the XY table by the same method as described in the embodiment and then fixed so that the screen 10 does not move with respect to the XY table. After that, the abutment bolt 19 is retracted so that the tip 19A of the abutment bolt of the positioning jig 15 does not engage with the engaging portion of the adjustment base. Then, the coordinates of the alignment mark 14 formed on the screen member 12 are measured by the CCD camera 23, and X is calculated based on the formulas (6) and (7), and further based on the formula (11).
The amount of movement of the Y table in the x and y directions is calculated. Then, the XY table is moved based on the calculation result. Then, the butting bolt 19 is rotated to securely engage the tip 19A of the butting bolt of the positioning jig 15 with the engaging portion of the adjusting table, and then the screen 10 is removed from the XY table. In this way, the screen 10 can be aligned.

Alternatively, the adjustment table is moved in the x direction,
It is also possible to adopt a structure in which an XYφ table movable in the y direction and rotatable around the z axis is placed on the adjustment table. Also in this case, as described in the embodiment, the screen 10 is placed at a predetermined position on the XYφ table and then fixed so that the screen 10 does not move with respect to the XYφ table. After that, the abutment bolt 19 is retracted so that the tip 19A of the abutment bolt of the positioning jig 15 does not engage with the engaging portion of the adjustment base. And the screen member 1
The coordinates of the alignment mark 14 formed in 2 are measured by the CCD camera 23, and in the x direction and the y direction for superimposing the points P ₁ and P ₂ after rotation at the angle −θ and the points M ₁ and M ₂ . XYφ
Calculate the amount of table movement. Next, the XYφ table is rotated about the point A by the angle −θ, and further, x
The XYφ table is moved in the x direction and the y direction based on the calculation result of the movement amount of the XYφ table in the direction and the y direction. Then, the butting bolt 19 is rotated to securely engage the tip 19A of the butting bolt of the positioning jig 15 with the engaging portion of the adjusting stand, and then the screen 10 is removed from the adjusting stand. In this way, the screen 10 can be aligned.

[0045]

According to the present invention, since it is not necessary to align the screen after mounting the screen on the screen printing machine, the work of mounting the screen on the screen printing machine becomes extremely easy and the mounting work can be performed. The time can be shortened, the operating rate of the screen printing machine is increased, and the productivity is improved. Alternatively, it is possible to eliminate the need to adjust the position of an object to be printed placed on the printing table of the screen printing machine, simplify the structure of the screen printing machine, and manufacture the screen printing machine at low cost. And the printing time can be shortened,
Productivity is improved.

Further, since the screen printing screen is aligned using the adjustment stand independent of the screen printing machine, there is no possibility that the operating rate of the screen printing machine is lowered due to the screen alignment. . Also,
The same alignment mark may be formed on all screens, and the pattern of the alignment mark can be simplified.

[Brief description of drawings]

FIG. 1 is a perspective view of a screen in a screen printing method of the present invention and a diagram showing details of a positioning jig.

FIG. 2 is a perspective view of an adjustment table and a master screen.

FIG. 3 is a schematic plan view showing a state in which a screen is placed on an adjusting table.

FIG. 4 is a schematic diagram showing a state of screen printing.

FIG. 5 is a view showing a positioning jig arranged on a screen so that a deviation between a position of an alignment mark formed on a screen member and a position of an alignment mark provided on an adjusting table is minimized. It is a figure for demonstrating the operation which adjusts.

FIG. 6 shows a positioning jig arranged on the screen so that the deviation between the position of the positioning mark formed on the screen member and the position of the positioning mark provided on the adjustment base is minimized. It is a figure for demonstrating the operation which adjusts.

FIG. 7 shows a positioning jig arranged on the screen so that the deviation between the position of the positioning mark formed on the screen member and the position of the positioning mark provided on the adjustment base is minimized. It is a figure for demonstrating the operation which adjusts.

FIG. 8 is a view showing a positioning jig arranged on the screen so that a deviation between a position of an alignment mark formed on the screen member and a position of an alignment mark provided on the adjusting table is minimized. It is a figure for demonstrating the operation which adjusts.

FIG. 9 shows a positioning jig arranged on the screen so that the deviation between the position of the positioning mark formed on the screen member and the position of the positioning mark provided on the adjustment base is minimized. It is a figure for demonstrating the operation which adjusts.

[Explanation of symbols]

10 Screen printing screen 11 screen frames 12 screen members 13 patterns 14,22,32 Alignment mark 15 Positioning jig 16 Protrusion 17 Through hole 18 lock nuts 19 Butt bolt 19A Butt bolt tip 20 Adjusting stand 21, 31, 41 Engagement part 23 CCD camera 30 master screen 40 screen printing machine 42 printing table 43 Squeegee 44 Printed matter 45 printing materials

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) B41F 15/36 B41N 1/24 B41C 1/14 101 B41M 1/12

Claims (2)

(57) [Claims] 1. A rectangular screen frame; (b) a screen member attached to the screen frame, on which a pattern portion to be printed and at least two alignment marks are formed; and (c) a screen frame. In a screen for screen printing, which comprises at least two alignment jigs on one side and at least one on one side of a screen frame orthogonal to the one side, aligning the alignment mark with a predetermined position. A method for aligning a screen for screen printing, which comprises: (A) providing alignment marks associated with each of the alignment marks formed on the screen member at predetermined positions and arranging the alignment marks on the screen; The alignment jigs that engage with the respective alignment jigs, (B) Measure the displacement between the position of the alignment mark formed on the screen member and the position of the alignment mark provided on the adjustment base, and (C) A method for aligning a screen for screen printing, comprising adjusting an alignment jig arranged on the screen so that the displacement is minimized. 2. (a) a rectangular screen frame; (b) a screen member attached to the screen frame, on which a pattern portion to be printed and at least two alignment marks are formed; and (c) a screen frame. A screen printing screen comprising at least two on one side and at least one on one side of a screen frame orthogonal to the one side is used for screen printing. Positioning marks associated with each of the positioning marks are provided at predetermined positions, and on an adjusting table provided with an engaging portion that engages with each of the positioning jigs arranged on the screen, Place the screen so that the engagement portion and the alignment jig engage with each other, and (B) position the alignment mark formed on the screen member and the adjustment table. The deviation from the position of the eclipsed alignment mark is measured, and (C) the alignment jig arranged on the screen is adjusted so that the deviation is minimized, and the alignment jig is formed on the screen member. After aligning the alignment mark at a predetermined position, (D) aligning the engagement portion with a screen printing machine provided with an engagement portion that engages with an alignment jig arranged on the screen. A screen printing method, wherein screen printing is performed after the screen is attached so that the jig is engaged.