JP2000177101A - Method for adjusting position of plate in screen printing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for adjusting the position of a plate in a screen printing apparatus which improves the accuracy of positioning of the plate and shortens considerably a time for a setup operation, in screen printing. SOLUTION: A plurality of plate adjustment marks are formed in prescribed positional relations, simultaneously with a printing pattern, on a screen 1 beforehand and the plate adjustment marks are printed on a printing matter provided with registration marks. The relative positional relations between the plate adjustment marks printed on the printing matter and the registration marks are picked up in image monitors by TV cameras 13A and 13B so fixed as to correspond to mark positions, and an image processing part 14 is made to recognize the mark positions and to conduct image processing computation of a positional slippage of the positional relations between the plate adjustment marks printed and the registration marks from those between plate adjustment marks and registration marks which are registered beforehand by a reference plate. The position of the printing matter is corrected by a position adjusting table 10 whereon the printing matter is placed, and it is set at the same as that in the reference positional relations.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate in a screen printing apparatus suitable for printing a pattern on a printed circuit board such as a multilayer wiring board or an internal electrode pattern of a laminated component such as a multilayer chip inductor and a multilayer chip capacitor. The position adjustment method.

[0002]

2. Description of the Related Art In a conventional screen printing apparatus, a method of fixing a printing plate by printing is as follows. As a method of fixing the plate, a method of fixing the position of the screen frame by using pins and clamps such as cylinders and prisms has been adopted. Therefore, if the screen is deteriorated or the printing pattern is misaligned, it is not possible to align the printing pattern on the screen. The position was being checked.

That is, as this checking method, a test printing operation is performed, the position of a printed pattern is enlarged and measured with a microscope or the like, and the position correction is repeatedly performed to adjust the position of the plate.

[0004]

However, the work of adjusting the position of the printing plate requires a long set-up work time due to printing work and measurement of a pattern position, and the positioning accuracy is poor. For this reason, there was a problem that the position of the print pattern was largely shifted before and after the screen replacement, resulting in poor printing.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method of adjusting the position of a plate in a screen printing apparatus, which improves the positioning accuracy of the plate in screen printing and significantly shortens the setup work time.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention makes it possible to correct the positional relationship between a printing pattern and a printing material by a simple operation so that the positional relationship between the printing pattern and the printing material becomes constant. Saves unnecessary work time such as checking the pattern position,
It is another object of the present invention to provide a method for adjusting the position of a plate in a screen printing apparatus which improves the efficiency of screen printing.

That is, the present invention relates to a method of aligning a plate in a screen printing apparatus, which combines a plate alignment mark on a screen and image processing to feed back the positional relationship between the plate and the printing material to perform alignment. In the above, a plurality of plate alignment marks are formed in a fixed positional relationship simultaneously with the print pattern on the screen, and the plate alignment marks are printed on the printing material provided with the alignment marks, and printed on the printing material. The relative positional relationship between the set alignment mark and the alignment mark is transferred to an image monitor with a television camera corresponding to the mark position so that the mark position is recognized, and the alignment mark registered in advance on the reference plate. And the positional relationship between the alignment mark and the printed plate alignment mark and the alignment mark. The by image processing operation to adjust the position of the substrate at a position adjustment table equipped with the substrate,
This is a method for adjusting the position of the plate in the screen printing apparatus to be at the same position as the reference positional relationship.

The present invention also relates to a plate position adjusting method for a screen printing apparatus, wherein the reference position is always registered using a reference plate before starting a printing operation.

The present invention also relates to a method of adjusting a position of a plate in the screen printing apparatus, wherein the positioning mark and the plate alignment mark provided on the reference plate used for reference position registration are screens using a φ1 through hole. This is a method for adjusting the position of a plate in a printing apparatus.

The present invention also relates to a method of adjusting the position of a plate in the screen printing apparatus, wherein the reference plate used for registration of the reference position is a plate having a thickness of 2 mm and a material of aluminum. .

Further, according to the present invention, in the method of adjusting the position of a plate in the screen printing apparatus, after performing position adjustment with a position adjustment table, the printing medium is vacuum-fixed to the position adjustment table and slid on a printing screen. This is a method for adjusting the position of the plate in the screen printing apparatus.

[0012]

Embodiments of the present invention will be described below.

FIG. 1 is a plan view of a printing screen according to an embodiment of the present invention. In FIG. 1, a plurality of plate alignment marks 3 (circles of φ1) are formed on a printing screen 1 at the same time when a printing pattern 2 is made. As a result, the positional relationship between the print pattern 2 and the plate alignment mark 3 is defined with extremely high precision.

FIG. 3 is a schematic diagram showing the position adjusting system of the present invention. First, before starting printing, using the reference plate shown in FIG. 2, the position of the alignment mark 5 provided on the reference plate used for aligning the printing platen 12 which is the printing object in the image processing unit 14 and the reference. The position of the plate alignment mark 6 provided on the plate is registered as a reference position. A reference plate having a thickness of 2 mm, a material of aluminum, φ1 mm, and a through-hole mark is used. When the screen has to be replaced due to damage of the print screen after the printing is started, first, after stopping the printing operation, a new screen provided with the mark for plate alignment shown in FIG. 1 is set, Printing is performed on the printing platen 12.

An alignment mark is formed on the printed platen thus printed. There are two types of marks, a positioning mark provided in advance and a printed plate alignment mark. The mark shape here is
It is a circle of φ1 mm.

[0016] The mark is confirmed by the television cameras 13A and 13B of the image processing apparatus arranged at a position where the plate alignment mark can be photographed facing the mark position, and processing such as camera switching is performed. The image is displayed on the image monitor 15 via the image processing unit 14 to be performed, and the mark position is recognized.

The positional deviation between the recognized mark position and the previously registered mark position is calculated by the image processing unit 14 to correct the position, and the new relative positional relationship is registered again.

This completes the screen alignment,
After the start of printing, as shown in FIG.
After the position shift of the printing platen is corrected on the position adjustment table 10 on which the A and 13B are arranged, the position adjustment table 10 is moved and corrected. Slide to print.

By the above-described plate matching operation, the positional relationship between the printing pattern 2 of the screen 1 and the printing platen 12 of the printing substrate is accurately defined, so that a trial printing operation or the like at the time of screen replacement can be omitted. Work time can be shortened. In addition, when printing is performed, the accuracy can be further improved by performing the positioning based on the feedback as appropriate.

As described above, according to the method of adjusting the position of the plate in the screen printing apparatus of the present invention, the screen 1 is pressed against the printing material by the printing squeegee 7 and the paste 9 is moved by the printing squeegee 7 to move the printing material. A plurality of plate alignment marks 3 are formed on the screen 1 at the same time as the printing pattern 2 in a fixed positional relationship, and the plate alignment marks are printed on a printing material provided with the alignment marks. Then, the relative positional relationship between the plate alignment mark printed on the printing material and the alignment mark is transferred to the image monitor 15 by the television cameras 13A and 13B fixed in correspondence with the mark position to recognize the mark position. And the positional relationship between the plate registration mark and the registration mark registered in advance on the reference plate and the printed plate The position of the printing medium is adjusted by the position adjustment table 10 on which the printing medium is placed by performing image processing calculation on the positional deviation between the positioning mark and the positional relationship between the alignment mark and the reference position. did.

Therefore, it is possible to easily carry out plate matching in which the relative positional relationship between the printing pattern formed on the screen and the printing material is fixed, and the setup time in screen printing can be shortened. In addition, it is possible to improve the position accuracy.

[0022]

As described above, according to the present invention, there is provided a method for adjusting the position of a plate in a screen printing apparatus, in which the positioning accuracy of the plate is improved in screen printing and the setup work time is remarkably reduced. it can.

[Brief description of the drawings]

FIG. 1 is a plan view of a printing screen according to an embodiment of the present invention.

FIG. 2 is a plan view and a cross-sectional view of a mark of the reference plate according to the embodiment of the present invention.

FIG. 3 is a configuration diagram showing, as blocks, a position adjustment table on which a printing screen and a printing platen are mounted, and an image processing unit.

[Explanation of symbols]

 Reference Signs List 1 screen 1a plate 2 printing pattern 3 plate alignment mark 4 reference plate 5 alignment mark (provided on reference plate) 6 plate alignment mark (provided on reference plate) 7 printing squeegee 8 scraper 9 paste 10 position adjustment table 11 slide Rail 12 Printing surface plate 13A, 13B TV camera 14 Image processing unit 15 Image monitor

Claims (5)

[Claims] 1. A method of aligning a plate and a printing material by combining a plate alignment mark on a screen and image processing, the method comprising: A plate alignment mark is formed in a fixed positional relationship, the plate alignment mark is printed on a printing material provided with the alignment mark, and the plate alignment mark printed on the printing material is aligned with the alignment mark. The relative positional relationship with the mark is transferred to an image monitor with a television camera corresponding to the mark position to recognize the mark position, and the positional relationship between the plate registration mark and the registration mark registered in advance on the reference plate, The position where the printed material is mounted by performing image processing calculation of the positional deviation between the printed plate alignment mark and the positional relationship between the alignment mark. A position adjustment method for a plate in a screen printing apparatus, wherein a position of a printing medium is adjusted with an adjustment table so as to be in the same position as a reference positional relationship. 2. The method according to claim 1, wherein the reference position is always registered using a reference plate before starting the printing operation. Method. 3. The method for adjusting the position of a plate in a screen printing apparatus according to claim 1 or 2, wherein the positioning mark and the plate alignment mark provided on the reference plate used for reference position registration use a through hole of φ1. A method for adjusting a position of a plate in a screen printing apparatus. 4. A method for adjusting the position of a plate in a screen printing apparatus according to claim 1, wherein
2m thick on the reference plate used for reference position registration
m, a method of adjusting the position of a plate in a screen printing apparatus, characterized by using aluminum. 5. A method for adjusting a position of a printing plate in a screen printing apparatus according to claim 1,
A method of adjusting the position of a plate in a screen printing apparatus, comprising: performing a position adjustment with a position adjustment table, vacuum-fixing a printing medium to the position adjustment table, and sliding the printing object on a printing screen.