JP2000272089A - Method for correcting deviation of position of printing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct deviation of position of printing which can perform in a short time and with high accuracy positioning of an article to be printed to a printed plate. SOLUTION: After an article to be printed on which reference marks 11a-11d for recognizing position are provided in advance is placed on a table for printing, printing is performed by using a printed plate and printing position confirming marks 13a-13d are simultaneously printed in the neighborhood of the reference marks 11a-11d for recognizing the position. Each of these marks is caught by the fields of view of imaging cameras 3a and 3b to measure amt. of deviation of the printing position confirming marks 13a-13d to the reference marks 11a-11d for recognizing the position by image processing and the position of the table 1 for printing is corrected in the X, Y and θ directions in accordance with the amt. of deviation of both marks to perform positioning of the article to be printed to the printed plate 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing position for correcting the position of a printing table in the X, Y, and .theta. Directions in accordance with data obtained by image processing, and for aligning a printing target with a printing plate made by a screen printing machine. This relates to a displacement correction method.

[0002]

2. Description of the Related Art Conventionally, in a screen printing machine, a printing material provided with a position recognition reference mark in advance is placed on a printing table, and at the start of printing, provisional printing is performed by printing plate making, and this printing pattern is formed by an imaging camera. The amount of displacement of the print pattern with respect to the position recognition reference mark is obtained by image processing, the position of the print table is corrected in the X, Y, and θ directions in accordance with the amount of displacement of the print pattern, and the position of the printing object relative to the printing plate is determined. Matching is being done.

Since the position of the printing object is adjusted in accordance with the amount of deviation of the print pattern from the position recognition reference mark, it is necessary to achieve accuracy by several times of temporary printing. For this reason, it takes a lot of setup time to align the printing medium, and it must be performed every time the print pattern changes, and furthermore, printing misalignment may occur during printing several times. It is extremely troublesome work.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a printing position deviation correcting method capable of positioning a printing material with respect to a printing plate in a short time and with high accuracy.

In the present invention, even when printing is repeatedly performed,
It is an object of the present invention to provide a printing position shift correction method capable of maintaining the printing accuracy of a printing material on a printing plate.

[0006]

According to a first aspect of the present invention, there is provided a printing position shift correcting method, wherein a printing material provided with a position recognition reference mark is placed on a printing table, and the printing material is printed on the printing material. At the same time as printing, printing a print position confirmation mark near the position recognition reference mark,
Each mark is captured within the same field of view of the imaging camera, the amount of displacement of the print position confirmation mark with respect to the position recognition reference mark is measured by image processing, and the print table is set in the X, Y, and θ directions in accordance with the amount of displacement of both marks. The position of the printing medium is adjusted with respect to the printing plate making.

In the printing position deviation correcting method according to a second aspect of the present invention, a printing object provided with a position recognition reference mark in advance is placed on a printing table, and the position recognition reference mark is captured by an imaging camera. The processing is performed to measure the displacement of the mounting position of the printing material relative to the printing plate, and before printing the printing material by the printing plate, the printing table is set in the X, Y, and θ directions according to the mounting position deviation of the printing material. The position is to be corrected.

In the printing position deviation correcting method according to a third aspect of the present invention, the position recognition reference mark is provided by a through hole to distinguish it from the printing position confirmation mark.

In a printing position deviation correcting method according to a fourth aspect of the present invention, a printing position confirmation mark is provided together with a position recognition reference mark corresponding to a corner position of a quadrilateral which apparently surrounds a printing range of a printing medium. , Each mark is captured within the same field of view of each imaging camera, and the print table is set to X, X in accordance with the shift amount of each mark comprehensively obtained by image processing.
The position is corrected in the Y and θ directions.

[0010] In a printing position deviation correcting method according to a fifth aspect of the present invention, a printing position confirmation mark is provided on a carrier film for feeding a pitch by a predetermined length together with a position recognition reference mark. The deviation of the print position confirmation mark from the position recognition reference mark is measured by image processing by capturing within the same field of view, and the deviation amount of both marks is determined every time printing is performed or the position of the printing object with respect to the subsequent printing plate making every several times. Feedback is provided as matching data.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a printing position shift correcting method according to an embodiment of the present invention; The printing substrate is suction-placed on a printing table of a screen printing machine to perform a predetermined printing process, and the printing table is corrected in position in the X, Y, and θ directions according to information obtained from the printing to make a printing plate. Applied to align the substrate with respect to

In the screen printing machine, as shown in FIG. 1, the printing table 1 is moved in the X, Y, and Z directions by a screw shaft rotated by a servomotor or the like, and is centered on a vertical axis supporting the printing table 1. Is provided so that rotation can be adjusted in the θ direction by a servomotor or the like. On the printing table 1, a screen printing plate 2 is provided so as to be able to move up and down on the upper side with a carrier film 10 which is fed by a predetermined length in a horizontal direction at a pitch. Also,
At the lower side of the printing table 1, four imaging cameras 3a and 3b (only two are shown) are provided as described later.

The carrier film 10 is provided with position recognition reference marks 11a to 11d as shown in FIG. The position recognition reference marks 11a to 11d are used to recognize the position of the printing range 12 of the printing object sucked and placed on the print table 1 and correspond to the corner positions of the quadrilateral which apparently surrounds the printing range 12 of the printing material. Provided in advance. Each of the position recognition reference marks 11a to 11d is
The film surface of the carrier film 10 is provided by a through hole formed by piercing the film surface to a diameter of about 1 mm.

In the screen printing machine, after a printing material provided with the position recognition reference marks 11a to 11d is mounted on the printing table 1 by suction, temporary printing is performed on the printing material by printing plate making, and at the same time, printing is performed. Position confirmation mark 13
a to 13d are printed in the vicinity of the position recognition reference marks 11a to 11d with a size of about 1 mm in diameter.
To 11d and 13a to 13d to correct the printing position.

The marks 11a to 11d and 13a to 1
3d is captured within the same field of view of each of the four imaging cameras 3a to 3d, and is subjected to image processing to obtain position recognition reference marks 11a to 11d.
The displacement amount of the print position confirmation marks 13a to 13d with respect to d is measured. At this time, each of the marks 11a to 11d
Is a through hole, and the other 13a to 13d are provided so as to be distinguished from each other by printing, so that the imaging cameras 3a to 3d
Are reliably captured within the same field of view, and are obtained as data for accurately measuring the amount of deviation by image processing.

The two marks 11a to 11d and 13a to 1
By correcting the position of the print table 1 in the X, Y, and θ directions by the above-described drive mechanism in accordance with the amount of displacement of 3d, it is possible to perform high-accuracy alignment of the printing medium with respect to the printing plate making 2. The alignment of the printing object is performed by the printing position confirmation mark 13a with respect to the position recognition reference marks 11a to 11d.
Since it is based on the amount of deviation of ~ 13d, it is possible to perform high-precision positioning of the printing medium with respect to the printing plate making 2 with a small number of times of temporary printing or setup time.

In particular, to correct the deviation of the printing position, each of the marks 11a to 11d and 13a to 13d is transferred to each of the imaging cameras 3a to 3d.
Each mark 11a to 11d, 13a to 13d that is captured within the same field of view of 3d and comprehensively obtained by image processing
Is performed by correcting the position of the print table 1 in the X, Y, and θ directions in accordance with the deviation amount of the printing plate 1, the position of the printing medium with respect to the printing plate making 2 can be adjusted with extremely high accuracy in a short setup time.

The amount of misalignment between the two marks can be measured each time printing is performed or each time printing is performed several times, and can be fed back as alignment data of the printing medium with respect to the subsequent printing plate making. This makes it possible to automatically continue the positioning of the printing medium with respect to the printing plate making 2, so that even if printing is repeated, the amount of printing deviation can be kept small, and the printing accuracy of the printing material with respect to the printing plate making can be kept high. .

Prior to performing printing on the printing material by the printing plate making 2, the position recognition reference marks 11a to 11a
At the stage where the printing medium provided with 1d is mounted on the printing table 1 by suction, the position recognition reference marks 11a to 11d are captured by the imaging cameras 3a to 3d, and the mounting position of the printing medium with respect to the printing plate is shifted by image processing. Should be measured.

Since the position of the printing table 1 is corrected in advance in the X, Y, and θ directions in accordance with the displacement of the placement position of the printing material, the printing material is placed on the printing table 1 by suction. The positional deviation can be corrected, and the position of the print substrate 2 with respect to the printing plate making 2 can be adjusted by correcting the position of the print table 1 in the X, Y, and θ directions according to the amount of deviation of the two marks 11a to 11d and 13a to 13d. It can be performed with higher accuracy.

[0021]

As described above, according to the printing position deviation correcting method according to the first aspect of the present invention, a printing medium provided with a position recognition reference mark in advance is placed on a printing table and then subjected to printing plate making. At the same time as printing, a print position confirmation mark is printed in the vicinity of the position recognition reference mark, and each mark is captured within the same field of view of the imaging camera, and the amount of displacement of the print position confirmation mark with respect to the position recognition reference mark by image processing. Is measured, and the position of the print table is corrected in the X, Y, and θ directions in accordance with the amount of displacement between the two marks, so that the position of the printing material with respect to the printing plate making can be adjusted with high accuracy in a short setup time. it can.

According to the printing position misalignment correction method according to the second aspect of the present invention, a printing object provided with a position recognition reference mark in advance is placed on a printing table, and the position recognition reference mark is captured by an imaging camera. The image processing is used to measure the displacement of the mounting position of the printing material relative to the printing plate, and before printing the printing material by the printing plate making, the printing table is set to X, Y, and X in accordance with the mounting position deviation of the printing material. Since the position is corrected in the θ direction, the position of the print object can be adjusted with respect to the printing plate making by correcting the position of the print table in the X, Y, and θ directions according to the amount of deviation between the print position confirmation mark and the position recognition reference mark. It can be performed with high accuracy.

According to the printing position deviation correcting method according to the third aspect of the present invention, since the position recognition reference mark is provided by a through hole and distinguished from the printing position confirmation mark, the printing position confirmation mark and the position recognition reference mark are provided. Can be reliably captured in the same field of view of the imaging camera, and can be obtained as accurate data for measuring the amount of deviation by image processing.

According to the printing position deviation correcting method according to the fourth aspect of the present invention, the printing position confirmation mark and the position recognition reference mark corresponding to the corner position of the quadrilateral that apparently surrounds the printing range of the printing object are set. Is provided, and each mark is captured within the same field of view of each imaging camera, and the print table is set to X or X in accordance with the shift amount of each mark comprehensively obtained by image processing.
By correcting the positions in the Y and θ directions, it is possible to perform the positioning of the printing medium with respect to the printing plate making with extremely high accuracy in a short setup time.

According to the printing position deviation correcting method according to the fifth aspect of the present invention, a printing position confirmation mark is provided on a carrier film for feeding a pitch by a predetermined length together with a position recognition reference mark, and each mark is imaged. The misalignment of the printing position confirmation mark with respect to the position recognition reference mark is measured by image processing while being captured within the same field of view of the camera, and the misalignment amount of both marks is determined each time printing is performed or each time the printing is performed for the next printing plate. The positioning data of the substrate is fed back as the positioning data, so that the positioning of the substrate with respect to the printing plate can be automatically continued, and even if the printing is repeated, the amount of misalignment of the printing is reduced and the printing accuracy of the substrate with respect to the printing plate is reduced. Can be kept highly accurate.

[Brief description of the drawings]

FIG. 1 is an explanatory view schematically showing a screen printing machine to which a printing position shift correction method according to the present invention is applied.

FIG. 2 is an explanatory diagram showing a positional relationship between a position recognition reference mark and a print position confirmation mark to which the print position shift correction method according to the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printing table 2 Printing plate making 3a, 3b Imaging camera 10 Carrier film 11a-11d Position recognition reference mark 12 Print range of printed matter 13a-13d Printing position confirmation mark

Continued on the front page (72) Inventor Yoshikazu Ito 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDK Corporation (72) Inventor Masaaki Kaneko 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDK Corporation F term (reference) 2C035 AA06 FA27 FA30 FB24 FB27 FB33 FC07 2C250 EA37 EB26 EB28 EB42 5E343 AA02 DD03 FF02 FF30

Claims (5)

[Claims] An object to be printed provided with a position recognition reference mark in advance is placed on a printing table, and printing is performed on the object by printing plate making. The prints are printed in the vicinity, each mark is captured within the same field of view of the imaging camera, the amount of deviation of the print position confirmation mark with respect to the position recognition reference mark is measured by image processing, and the print table is set to X in accordance with the amount of deviation of both marks. , Y, and θ directions, and the position of the printing medium is adjusted with respect to the printing plate making. 2. A printing object provided with a position recognition reference mark in advance is placed on a printing table, and the position recognition reference mark is captured by an image pickup camera, and a displacement of the placement position of the printing material with respect to the printing plate is measured by image processing. The printing table is corrected in the X, Y, and θ directions in accordance with the displacement of the mounting position of the printing material before printing on the printing material by printing plate making. 2. The printing position deviation correction method according to 1. 3. The print position misalignment correction method according to claim 1, wherein the position recognition reference mark is provided by a through hole to distinguish the mark from the print position confirmation mark. 4. A printing position confirmation mark is provided along with a position recognition reference mark corresponding to the corner position of a quadrilateral that apparently surrounds the printing range of the printing object, and each mark is captured within the same field of view of each imaging camera. The print table is set to X, according to the shift amount of each mark obtained comprehensively by image processing.
4. The method according to claim 1, wherein the position is corrected in the Y and [theta] directions. 5. A printing film comprising: a print position confirmation mark provided together with a position recognition reference mark on a carrier film for feeding a predetermined length at a pitch; each mark is captured within the same field of view of an imaging camera; The amount of misalignment of the printing position confirmation mark is measured, and the amount of misalignment of the two marks is fed back as alignment data of a printing material with respect to a subsequent printing plate every time or every several times of printing. Item 5. The printing position shift correction method according to any one of Items 1 to 4.