KR101247296B1 - System for printed electronics and method for calibration - Google Patents

Abstract

The present invention relates to a vision measurement method that enables precise alignment control by acquiring information on the overlap error when printing the ink of two degrees or more in a printing machine and using the same for control of the alignment error.

Description

Electronic device printing system and calibration method using same {System for printed electronics and method for calibration}

The present invention relates to a vision measurement method that enables precise alignment control by acquiring information on the overlap error when printing the ink of two degrees or more in a printing machine and using the same for control of the alignment error.

Printed electronics, which produces electronic devices by printing, is gaining much attention, including mass production of low-cost products such as RFID antennas, polymer transistors, flexible displays, and solar cells. It is possible to produce a product that can play the role of an electronic device only by producing printed electronic devices with the concept of a conventional printing press, but increasing the precision to several tens of microns. The most important technology in such a printing machine is precise alignment control. In order to manufacture electronic devices such as transistors by superimposing printing of functional inks such as insulating, semiconducting, and conductive materials, the alignment accuracy of each ink layer may be in the order of several to several tens of micrometers. It must be secured.

Conventional printing presses determine errors based on human vision, or use vision measuring systems to determine errors based on the distance difference between alignment marks, and the correction of the errors is performed by manually shifting the position or phase shift of the plate making roller. However, this method is not suitable for precision printing presses, which must consistently guarantee alignment errors within several to several tens of micros. Even in the printing machine that performs the control automatically, there is no information about the rotation of the roller or the initial position, so it is time-consuming and expensive to perform the alignment alignment manually at a certain position, and then perform the automatic control to the automatic control section. There is a disadvantage.

In addition, after printing each mark of the prints that need to be aligned, the error of the mark is compared and used for alignment control. In this case, the error compensation is more than a certain degree when the follow-up action is taken by using the error information already generated. Hard to get effect

As a way to solve this problem, the camera can be installed before the superimposed printing to measure the error with the reference point, and the printing position can be controlled to compensate for the error. In this case, the camera capable of measuring the alignment performance is superimposed. It must be installed later.

Accordingly, the present invention provides a method for using a camera installed after printing to monitor overlapping performance as well as for monitoring as well as feedback for overlapping control.

The present invention for achieving the above object is a printing system 100 having a preceding printing unit and a trailing printing unit for multi-layer printing on the printed object, the printing unit 10 and the trailing printing unit 20 The position error detection means 200 for visually detecting the position error of the printed layer (P) to be printed by adjusting the image acquisition time interval by using the print speed information is provided in plurality; The position error detecting means 200 includes a preceding sensing means 210 and a trailing sensing means 220 which are respectively installed before and after the trailing printing unit 20, and are installed in the trailing printing unit 20. An electronic device printing system having a printing position correcting apparatus including a control unit C for controlling stacking printing according to the position of the printing layer P printed by the preceding printing unit 10 is featured.

In addition, the piezo actuator device 200 includes a support frame 210 for supporting the printing roller R of the plate making cylinder 12 or the blanket cylinder 13, and a rotation shaft R1 of the printing roller R. The controller 220 is rotatably supported, a linear guide 230 for guiding the movement of the support frame 210, and a control unit for controlling the supply and interruption of power by moving the support frame 210 ( 241 and a piezo actuator 240 including a piezo 242 to generate a volume change by the supplied power, and a main frame 250 in which the piezo actuator 240 is installed.

In this case, the calculating of the preceding error (S110) may include obtaining an image of the preceding register mark R1 by the preceding sensing unit (S111), and the preceding register mark R1 from the center point of the image. The step S112 may include calculating a preceding error by measuring a printed object width direction error and a printed object traveling direction error up to a center point of the target point.

The calculating of the trailing error 120 may include acquiring an image of the preceding register mark R1 and the following register mark R2 by the trailing sensor 220 (S121), and the preceding register mark. And calculating a trailing error by measuring a printed object width direction error and a printed object travel direction error from the center point of R1 to the center point of the trailing register mark R2.

In addition, the step (S130) of calculating the final error may be weighted to the preceding error and the following error.

According to the present invention, the printing precision can be increased by installing camera devices for sensing the printing position before and after printing.

1 is a schematic configuration diagram of an electronic device printing system having a printing position correction device according to the present invention;
2 and 3 are conceptual diagrams for defining a preceding error and a trailing error.

The present invention provides a device including a control unit (C) for installing a plurality of sensing means 200 in the printing system 100 as described above to calculate the position error of the print layer (P) and perform a predetermined control and related thereto. It will be described in detail with reference to the accompanying drawings and examples as a correction method.

Example 1

The present invention is a printing system (100) having a preceding printing unit and a trailing printing unit for multi-layer printing on a printed object, the printing layer (P) printed by the preceding printing unit 10 and the trailing printing unit 20 (P) ) Is provided with a plurality of position error detecting means 200 for detecting.

In this case, the position error detecting means 200 includes a preceding sensing means 210 and a trailing sensing means 220 which are installed before and after the trailing printing unit 20, respectively.

In addition, the control unit (C) is installed in the post-printing unit 20 and controls the laminated printing to be performed in accordance with the position of the printing layer (P) printed by the preceding printing unit 10.

At this time, the position error detecting means 200 adjusts the image acquisition time interval by using the printing speed information on the position error of the printing layer (P) printed by the preceding printing unit 10 and the subsequent printing unit 20 Will be visually sensed.

As shown in FIG. 1, when the preceding printing unit 10 is on the right side in the drawing and the trailing printing unit 20 is on the left side in the drawing, first printing is performed on the printed matter W by the preceding printing unit 10. The layer 2 is printed, and the second printed layer 3 is printed by the post-printing unit 20.

At this time, the positions of the first printed layer 2 and the second printed layer 3 should coincide with each other, and for this purpose, the position recognition of the printed material W becomes important.

The piezo actuator 240 includes a control unit 241 for controlling the supply and interruption of power as the moving support frame 210 and a piezo 242 for generating a volume change by the supplied power.

The position error detecting means 200 recognizes a register mark to be described later, calculates a position error of the register mark, and determines whether the position of the printed material W is correct.

Meanwhile, in the present exemplary embodiment, a case in which the preceding printing unit 10 and the trailing printing unit 20 are arranged one by one and the second printing is illustrated, but the preceding printing unit 10 or the trailing printing unit 20 is provided in plurality. It is possible if arranged.

In addition, in the present embodiment, the prior printing unit 10 shows a gravure offset printing apparatus including a plate-making cylinder 11, a blanket cylinder 12 and the pressure cylinder 13, the present invention is not limited thereto. Naturally, even if the printing unit is a gravure printing device, all belong to the scope of the present invention.

Hereinafter, a correction method using the above-described printing system of the present invention will be described.

Example 2

The present invention is a correction method (S100) using the above-described electronic device printing system, the step (S110, hereinafter referred to as the first step) of calculating the preceding error of the preceding printing unit, and the trailing error of the trailing printing unit 20 Calculating a step (S120, hereinafter referred to as a second step), calculating a final error (S130, hereinafter referred to as a third step), and driving the controller C (S140, hereinafter referred to as a fourth step) (See FIGS. 2 and 3).

The first step (S110) is for calculating a position error of the preceding register mark R1 printed by the preceding printing unit 10. The preceding register mark is obtained from one point of the image of the preceding detecting unit 210. The error in the printed object width direction (direction I) and the printed object traveling direction (direction II) up to a specific point in R1 is measured to calculate the preceding error of the preceding printing unit.

At this time, the first step (S110), the step of calculating the preceding error (S110) is a step of obtaining an image of the preceding register mark (R1) by the preceding sensing means (S111), and the center point of the image And calculating a prior error by measuring a printed width direction (direction I) error and a printed direction travel direction (direction II) error from the center point of the preceding register mark R1 to the center point of the preceding register mark R1 (S112).

As shown in FIG. 2, when the preceding register mark R1 has a cross shape, the width direction (direction I) distance between the center point of the image and the center point of the preceding register mark R1 is X1 and the traveling direction (direction II). You can define the distance as Y1.

On the other hand, the step (S111) of acquiring an image of the preceding register mark (R1) uses a camera as the position error detecting means 200, but at the time when the preceding register mark (R1) passes, the image is obtained by driving the camera. can do.

Since this is a well known technique, a detailed description thereof will be omitted.

Meanwhile, after calculating the preceding error by the first step (S110), a second step (S120) of calculating the following error is performed.

The second step S120 is to calculate a position error of the trailing register mark R2 printed by the trailing print unit 20, and the specific position of the preceding register mark R1 and the trailing register mark R2. The trailing error of the trailing print unit 20 is calculated by measuring the width width error of the printed matter and the direction of the printed matter traveling direction between the specific positions of.

In this case, the second step (S120) is a step (S121) of acquiring an image of the preceding register mark (R1) and the following register mark (R2) by the following detecting means (220), and the preceding register mark (R1). And calculating a trailing error by measuring a printed width direction (direction I) error and a printed direction travel direction (direction II) error from the center point of the trailing register mark R2 to the center point of the trailing register mark R2 (S122). .

As shown in FIG. 3, when a circular trailing register mark R2 is obtained as an image on one side of the cross register precedent mark R1, the center point of the preceding register mark R1 and the trailing register mark R2 are respectively. The width direction (direction I) distance between the center points may be defined as X2, and the travel direction (direction II) distance may be defined as Y2.

After calculating the trailing error by the second step (S120), a third step (S130) of calculating the final error is performed.

The third step (S130) may be performed by Equation 1 by giving weights to the preceding error and the following error.

[Equation 1]

X: Final error in width direction of register mark

  X1: Width leading error of leading register mark

  A: Weight for width leading error

  X2: Width trailing error of trailing register mark

  B: weight for width trailing error

  Y: Final error in the direction of register mark travel

  Y1: Advance direction error of leading register mark

  C: weight for forward direction error

  Y2: Trailing error of the trailing register mark

D: weight for forward direction trailing error

When the final width X error and the final direction Y are calculated, the controller C is driven to correct the post-printing unit 20 so that accurate multi-layer printing can be performed.

On the other hand, since the control unit C of the post-printing unit 20 is a well known configuration, detailed description thereof will be omitted.

Meanwhile, as described above, the final error is defined as the sum of the preceding error and the trailing error, because the two errors are not independent but interdependent.

That is, since the leading error indicates the absolute position of the preceding register mark R1, and the trailing error is defined as the relative position of the trailing register mark R2 with respect to the preceding register mark R1, the error of the preceding register mark R1 is This is because the error of the trailing register mark R2 may be large if it is severe.

The error calculated by the preceding sensing means 210 provides information on where the printing unit should print, and the error by the trailing sensing means 220 is a priority function of measuring whether the printing is made where desired. to be.

As described above, the reason for using the preceding sensing means 210 is to measure and print the two register marks (R1, R2) already printed, and to calculate and control the error. This is because the compensation value may be significantly different at the control point.

For example, when the error is gradually increased, when the error measured by the trailing sensing means 220 is 20, the error in the trailing print unit 20 at this point may be 40 greater than this, but the measured 20 If you control only, the value is insufficient.

In this case, since there is no feedback on the compensation result, the following sensing means 220 is used as described above.

In particular, in consideration of the preceding error and the following error, when the error increases gradually, it is preferable to control based on the 40 measured by the preceding sensing means 210 rather than 20 measured by the following sensing means 220.

In this case, weights A and B may be added to the preceding error.

On the other hand, when the error is fluctuation at 20, only the trailing error may be controlled or the average of the two errors (for example, the weights C and D may be 0.5).

In this case, the weight may be automatically determined by a user or by a control system.

10: preceding printing unit 20: trailing printing unit
210: preceding detection means 220: trailing detection means
R: register mark

Claims (6)

delete Position error detection means 200 for visually detecting the position error of the printing layer P printed by the preceding printing unit 10 and the following printing unit 20 by adjusting the image acquisition time interval using the printing speed information. As a correction method (S100) using the electronic device printing system 100 is provided with a plurality of),
The position error detecting means 200 is provided in the preceding sensing means 210 and the trailing sensing means 220 which are respectively installed before and after the trailing printing unit 20 and the trailing printing unit 20, and the preceding printing. It includes a control unit (C) for controlling the laminated printing to be made in accordance with the position of the printed layer (P) printed by the unit 10,
The correction method (S100)
It is for calculating the position error of the preceding register mark R1 printed by the preceding printing unit 10, from one point of the image of the preceding detecting means 210 to a specific point of the preceding register mark R1. Calculating a preceding error of the preceding printing unit by measuring a printed object width direction error and a printed object moving direction error (S110);
Printed width between the specific position of the preceding register mark R1 and the specified position of the trailing register mark R2 as for calculating the position error of the trailing register mark R2 printed by the trailing printing unit 20. Calculating a trailing error of the trailing print unit 20 by measuring a direction error and a printed object moving direction error (S120);
Calculating a final error by adding weights to the preceding error and the following error, respectively, and adding the weights to each other;
Driving the controller C based on the calculated final error (S140),
The calculating of the preceding error (S110) may include obtaining an image of the preceding register mark (R1) by the preceding detecting means (210), and
Calculating a preceding error by measuring a printed object width direction error and a printed object direction error from the center point of the image to the center point of the preceding register mark (R1) (S112),
The calculating of the trailing error 120 may include acquiring an image of the preceding register mark R1 and the following register mark R2 by the following sensing unit 220 (S121);
And calculating a trailing error by measuring a printed width direction error and a printed direction travel direction error from the center point of the preceding register mark R1 to the center point of the trailing register mark R2. Printing position correction method of electronic printing system delete delete The method of claim 2,
The calculating of the final error (S130) is performed by the following equation 1 by giving weights to the preceding error and the following error, wherein the printing position correction method of the electronic device printing system.
[Equation 1]

X: Final error in width direction of register mark
X1: Width leading error of leading register mark
A: Weight for width leading error
X2: Width trailing error of trailing register mark
B: weight for width trailing error
Y: Final error in the direction of register mark travel
Y1: Advance direction error of leading register mark
C: weight for forward direction error
Y2: Trailing error of the trailing register mark
D: weight for forward direction trailing error
The method of claim 5,
The weighting method of the printing position correction method of the electronic device printing system, characterized in that automatically determined in the user's arbitrary or control system

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