JPS60259446A - Registration method between screen plate and object to be printed and device for screen printing - Google Patents

Abstract

PURPOSE:To permit a performance of an accurate, speedy and easy registration by providing in a passage between a screen plate and an object to be printed a detection means consisting of solid photographing elements to evaluate the relation between any of the passages by the detection means, and by calculating deviation. CONSTITUTION:A solid photographing elements 1 is fixed on a printing table 2, and its lens portion 1b is made to face the table top. A through-hole 3a to become a passage in relation to a CCD camera 1 is provided by perforation on an objecct 3 to be printed, and a register mark 4a is formed to make a passage in relation to the CCD camera 1 on a screen 4, too. If a monitor TV12 is concurrently provided, a distance V1, V2, U between a standard point 1a of the CCD camera 1 and the passage 4a of the screen plate 4 and a distance (y1), (y2), (x) between the standard point 1a of the CCD camera 1 and the passage 3a of the screen plate 3 on a display screen is obvious and the extent of the deviation is easily conceived. By the above method an accurate and speedy processing becomes feasible.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a method of screen printing in which a pattern formed at a predetermined position on a screen plate is printed onto a predetermined position on a printing material by matching an impact set on a screen plate with an impact provided on a printing material. The present invention relates to a method and apparatus for aligning the position of a printing material and a screen plate in accordance with the law.

Conventionally, in the screen printing method in which a pattern formed on a screen plate is printed onto a predetermined position of a printing material on a printing table, the positional alignment between the screen plate and the printing material is usually achieved by using a constant impact set on the screen plate. (Dragonfly mark)
Usually, the positional relationship between the screen plate and the printing material is regulated in advance so that the positional relationship between the screen plate and the printing material is realized by matching the position of the screen plate and the position provided on the printing material.

Various alignment methods can be considered to align the positions of the two, but due to inconsistency in the size of the printing material and inaccuracy in the position of the offset, the printing material and the screen plate may differ during the printing process. The oppositions of the two do not always match exactly,
This led to the emergence of ideas for rational methods.

The most basic alignment method is to visually adjust the alignment of the printing material being carried onto the printing table and the screen plate until they match, but this alignment method is quick and easy. This method has disadvantages in terms of performance and accuracy, and cannot be used in a continuous, automatic printing process.

Alignment is also carried out by preparing a reference printing material in advance, using this material as an opposition, and using electrical or mechanical means to match the printing material to be processed later with the opposition. There is a way.

Although this method has made progress in making it possible to apply it to continuous and automatic printing processes, it is inconvenient in that the printing substrate that is to be the target must be prepared in advance; Naturally, it cannot be applied to cases where the conditions are different from those at which the conflict occurred, such as when the printing material that was previously processed and the printing material that is subsequently processed are significantly different in size or other aspects. The drawback is that effective action can only be expected for loft units that are within the same standard.

Furthermore, although it is generally considered more rational to use an electric detection means as a means for aligning the opposition between the printing material and the screen plate, this electric means usually consists of multiple independent detection means. For example, a set of sensors such as phototransistors is often used as a detection means.

In this case, in relation to the screen plate or printing material, this phototransistor' is expected to work in conjunction with the action of light from the light source and its reflection, and these phototransistors' When the same amount of light and reflection is obtained from the transistor, it indicates that the alignment is correct and there is no deviation, and the degree of deviation indicates the deviation. Therefore, when using this detection means, the printing material or screen plate must be moved and adjusted a considerable number of times until the same amount of light and reflection are obtained from the phototransistor, which increases the mechanical complexity and the cost. This means that position matching accuracy cannot be obtained.

The present invention is intended to eliminate the various drawbacks found in these conventional techniques, and is intended to align the position of the printing material and the screen plate that are conveyed to the printing table via a solid-state image sensor such as a COD camera. Trying to do it more accurately, quickly, and easily. It is something.

The configuration of the present invention will be explained in detail below based on examples, but here it will be explained according to the apparatus used to implement the present invention.

The solid-state image sensor 1 is fixed to the printing table 2.
The lens portion 1b is directed upward from the table. The solid-state image sensor 1 here is typified by a so-called COD camera, and can take out images from photosensors arranged vertically and horizontally on a light-receiving surface with high accuracy in micro units. - This is suitable for setting the coordinates of the y-axis.

Hereinafter, the solid-state image sensor 1 will be explained using a COD camera.

The 00D camera 1 is fixed to a printing table 2, and its lens portion 1b faces the printing material 3 carried onto the printing table 2. A silk screen 4b on which a predetermined pattern 4d is formed is pasted on a frame 4C. It also faces the screen version 4. A through hole 3a is formed in the printing material 3, and a register mark 4a, which should be in opposition with respect to the COD camera 1, is formed on the screen plate 4. It is.

Therefore, the distance v1 on the y-axis between the reference point 1a set on the CCD-force camera 1 and the offset 4a set on the screen plate 4
, ■2 and the distance U on the and the reference point 1a of the COD camera 1
It will act as a constant reference value for the relationship with. That is, the reference point 1a of the COD camera 1 and the printing material 3
The following relational expression holds true for the distance y11y2 on the y-axis and the distance X on the x-axis between the opposite sides 3a and 3a.

x=u-x, yl=vL-yl, y2=v2-y2
(See Figure 3).

The position of the printing material 3 carried onto the printing table 2 in its advancing direction is regulated by a stopper pin 6 that is removably attached to the printing table 2, and its position in the direction perpendicular to the advancing direction is regulated by a fixed side plate 7. This is done by the action of the moving side plate 8.

This first positional regulation on the printing table 2 is made to be done fairly accurately in relation to the screen plate 4, and therefore, as long as it is carried onto the printing table 2 in a normal state, the positioning on the printing material 3 is made very accurate. The through hole 3a, which should serve as an opposition, is not separated from the lens portion 1b of the COD camera 1 fixed at a predetermined position on the printing table 2.

Note that the angle 3a of the printing material 3, which is significant in relation to the reference point 1a of the 1.00D camera 1, is not necessarily
It does not have to be a through hole drilled in the printing material 3, for example, the edge portion 3b of the printing material 3 may be used as the opposite end. In short, it is sufficient that an image forming brightness and darkness is formed on the OCD camera 1, and it can be said that the through hole 3a formed in the printing medium 3 is simple and most preferable in terms of handling. Further, in order to make the brightness and darkness captured by the 00D camera 1 clearer, it is preferable to install a light source 9 that irradiates light toward the through hole 3a at the opposite end of the printing medium 3.

In the figure, 10 is a pulse motor fixed to the printing table 2.
It acts on corresponding parts of the screen plate 4 as a member for adjusting the distance between three points on the screen plate 4, that is, two points y1.72 on the y-axis and one point X on the X-axis. Also, here I moved and adjusted screen version 4,
Of course, the amount of deviation between the two may be adjusted by moving the printing table 2.

Reference numeral 12 shown in the figure is a monitor TV that receives the video transmitted from the COD camera 1 and the reference line (cursor) that appears through the calculation process by the calculation device 11. The calculation device 11 calculates the relationship between the previously memorized distances v1 and 2 on the y-axis between the offset 4a of the screen plate 4 and the reference point 1a of the 00D camera 1, and the distance U on the X-axis. The cursor 13 appears as a vertical cursor and the cursor 14 as a horizontal cursor 14 through a necessary process. and the through hole 3 which is the opposite of the printing medium 3 as a result of detecting the distance X on the X axis.
A mark M through a is displayed, and a vertical cursor 15 that intersects at the center of the mark M is created through a calculation process.
This will cause a horizontal cursor 16 to appear (see Figure 4).

Therefore, if this monitor TV 12 is installed, the distance relationship v1, 2, U between the reference point 1a of the COD camera 1 and the opposition 4a of the screen version 4 and the reference point of the 00D camera 1 will be displayed on the screen. The distance relationships y1, yz, and x between the print material 1a and the printing medium 3a can be clearly seen at a glance, and the amount of deviation between the two can be grasped intuitively.

In the figure, 13 is a belt conveyor for carrying the printing material 3 to the printing table 2, and 14 is a belt conveyor for carrying the printing material 8 to the printing table 2.
This is a negative pressure suction hole for fixing the paper onto the printing table 2. Further, S is a squeegeeing device for printing the pattern 4d of the screen plate onto the printing medium 8 after the positional alignment between the screen plate 4 and the printing medium 3 is completed.

Now, when the printing material 3 is carried onto the printing table 2,
The stopper pin 6 protrudes onto the printing table 2 to regulate the position of the printing medium 3 in the traveling direction, and at the same time, the movable side plate 8 moves toward the stationary side plate 7 to adjust the position perpendicular to the traveling direction. to regulate. After that, stopper pin 6
When the printing tape 1 is lowered below the surface of the printing tape 2, and the printing table 2 is slightly raised and the printing material 3 is separated from the belt conveyor 18, the printing material 3 is removed from the negative pressure suction hole 14 on the surface of the table 2. Suction negative pressure onto the table 2 and fix it.

On the other hand, the COD camera 1 receives an image of the through hole 8a provided in the printing material 3 as a collision, and transmits this signal to the calculation device 11 in charge of calculation, and sends an image of the collision between the reference point 1a of the COD camera 1 and the printing material. The distance y1, yz on the y-axis between the through hole 3a and the
and the distance X on the X axis, and then the reference point 1a of the COD camera 1 stored in the storage device 5 in advance
y between and the registration mark 4a as the opposition of the screen version 4
This is evaluated in relation to the distances v1 and v2 on the axes and the distance U on the X axis, and furthermore, the amount of deviation occurring between the two is calculated. However, this amount of deviation is equivalent to the pulse motor.
10, that is, by moving the screen plate 4 via I'YI, I'Y2, and PX, the positional relationship between the screen plate 4 and the printing material 3 is accurately aligned, and as a result, the screen plate 4 The pattern 4d formed at a predetermined position is guaranteed to be printed at a predetermined position on the printing medium 3. At this time, if a monitor T'V12 is installed, the OOD camera 1 can be used as a reference value for feeding.
The distance relationship v between the reference point 1a and the opposition 4a of the screen plate 4
1. Distance relationship yl between the offset 3a of the printing medium and the reference point 1a of the COD camera with respect to v2su.

As mentioned above, yz and X can be grasped intuitively.

The development diagram in FIG. 5 shows a cursor 18.14 which is a reference value for the feeding material appearing on the monitor TV 12, and a cursor 15 related to the image of the through hole 3a of the printing material which shows the amount of deviation of the printing material 3 with respect to the cursor 18.14. .16, it shows in which direction and by how much screen plate 4 should be moved.

The screen plate 4 is moved upward (in the direction of the ■ section) by a pulse motor 10 by 971 minutes with respect to the position of the printing material 3, and then moved downward (in the direction of the ■ section) by l['2 minutes. As a result, the posture and positional relationship in the y-axis direction match the tilted printing material 3, and the tilted screen plate 4 is then moved to the left (in the θ direction) by pX, so that both of them are aligned. 3.4 means that the position is completely aligned.

As described above, the present invention utilizes a solid-state image sensor typified by a COD camera, uses a reference point set on the solid-state image sensor as a common term, and calculates the relational distance between this reference point and the opposition of the screen plate, and the distance between the reference point and the opposition of the screen plate, and Since the distance relative to the opposition is compared and calculated, and the amount of deviation that arises from that is resolved by moving the screen plate or printing table, the presence of the printing material that should be an opposition must not be planned in advance. It goes without saying that it is possible to perform positional matching based on the light reception ratio of multiple transistors, but the matching method and device are simple and can be expected to be more accurate and faster than conventional analog detection means that match the positions of multiple transistors. Now you can get it. In addition, when calculating the amount of misalignment between the printing material and the screen plate, x
It becomes easier to set the -y coordinate, and it also makes it possible to install a monitor TV, which has a great effect in making it possible to visually grasp the amount of misalignment between the printing material and the screen plate.

[Brief explanation of the drawing]

FIG. 1 is a top view 1 illustrating a device according to the present invention;
A block explanatory diagram of the attached device. Fig. 2 is a perspective view explaining the main parts of the device in Fig. 1 and a schematic explanatory diagram of the attached device. Fig. 3 shows the reference point of the solid-state image sensor and the contrast of the screen plate. Conceptual diagram illustrating the distance relationship and the distance relationship between the reference point of the solid-state image sensor and the opposite of the printing medium, No. 4
The figure is an explanatory diagram of the relationship shown in Fig. 3 where the monitor TV appears, and Fig. 5 shows the cursor 18, 14 which is the reference value that appears on the monitor TV and the mark that shows the amount of deviation of the printing material with respect to this. FIG. 3 is a conceptual development diagram illustrating the direction and amount of movement adjustment of the screen plate in relation to the cursors 15 and 16. ]... Solid-state image sensor, 1a... Reference point 2... Printing table, 3... Printing material 3a... Opposite (through hole), 4 Screen plate 4a... Opposite (
(register mark), 5 Storage device 6/stopper pin, 7, 8
...Position regulation side plate 10 (PYI, l?Y2.]
? X)...Pulse motor-11...Calculating device, 12-
・Monitor T'V18.15...Vertical cursor 14.16...Horizontal cursor M...Mark No. 311 Figure 4 Figure 5

Claims (5)

[Claims] (1) Set opposites on the screen plate and the printing material,
In a screen printing method in which a pattern formed at a predetermined position on a screen plate is printed on a predetermined position of a printing material carried onto a printing table by matching the collisions of the screen plate and the printing material. A detection means consisting of a solid-state image sensor is interposed between the screen plate and the printing medium, and a predetermined relationship between the solid-state image sensor and either the screen plate or the printing material is evaluated, and the amount of deviation between the two relationships is calculated. A method for positionally aligning a screen plate and a printing material in screen printing, characterized in that the positions of the two are aligned by calculation. (2) Setting opposites for the screen plate and printing material,
In a screen printing method in which a pattern formed at a predetermined position on a screen plate is printed on a predetermined position of a printing material that is carried onto a printing table by matching the collisions, a solid-state image sensor 1 fixed to a printing table 2 is used. The distances vl, v on the y-axis between the reference point 1a set on the solid-state image sensor 1 and the offset 4a set on the screen plate 4 via
2 and the distance U on the X axis is measured in advance and stored, and the relationship between the solid-state image sensor 1 and the offset 8a set on the printing material 3 carried onto the printing table 2 by the solid-state image sensor 1 is measured in advance. The distances y1, y2 on the y-axis and the distance X on the X-axis from the reference point 1a set in
Distance relationships v1, v2, U between the reference point 1 of the solid-state image sensor and the collision point 3a of the printing medium y1, y2,
A method for aligning the positions of a screen plate and a printing material in screen printing, characterized in that X is mutually evaluated, and the screen plate 4 or the printing table 2 is moved to compensate for the respective deviations. (3) The screen plate according to claim 2, characterized in that the offset 3a of the printing material 3 related to the reference point 1a of the solid-state image sensor 10 is specified by a through hole bored in the printing material 3. and how to align the position of the printing material. (4) A printing table 2 equipped with a striker pin 6 that regulates the position of the printing material 3 in the direction of travel, a fixed side plate 7 that regulates its position in the direction perpendicular to the direction of travel, and a movable side plate 8; In a screen printing machine having a screen plate 4 movably disposed above a table 2, a solid-state image sensor 1 with a lens portion 1b facing upward is attached to the printing table 2, and a printing target is attached to the screen plate 4. A registration mark 4a that serves as a counterpoint for positional alignment with the screen plate 4 is formed on the printing medium 3, and a through hole 3a that serves as a counterpoint for positional alignment with the screen plate 4 is formed on the printing medium 3, and is set in the fixed image pickup element 1. Reference point 1a and collision 4a between the screen plate
A storage device 5 for storing distances gvl-, v2 on the y-axis and distance U on the 1% M 2, distances y1, y2 on the solid-state image sensor 1 detected by the solid-state image sensor 1 for u (□" E. A calculation device 11 is provided to calculate the relationship between the above distances A device for aligning the position of the screen plate and printing material in screen printing. (5) The screen plate and printing material position alignment device according to claim 4, further comprising a monitor TV 12 coupled to the solid-state image sensor 1 via a storage device and a calculation device.