JP2002120351A - Screen printing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen printing method for performing the control of the tension of a screen and the control of the angle of the screen and a sheet in order to realize highly fine wiring width printing in screen printing. SOLUTION: A proper printing condition related to the screen required in highly fine wiring width printing can be set by controlling the tension T of a screen 105 by a motor 119 corresponding to the state of a squeegee 103 at the time of screen printing and controlling the angle θ formed by the screen 105 and a sheet 106 by a motor 123.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for printing on a sheet placed under a screen by placing the paste on a screen and moving the squeegee from one end of the screen to the other while pressing the paste with a squeegee. Related to screen printing to be performed.

[0002]

2. Description of the Related Art In this field, various attempts have been made in the trend of miniaturization of wiring width. For example, in the example shown in FIG. 4 (JP-A-3-106682), the force in the Z-axis direction of the squeegee 103 is detected by using a spring 102, and the force of the Z-axis direction of the squeegee 103 is detected by using a motor 101. There is an example of controlling.

[0005] Referring to FIG. 5, the main part is controlled by the force P of the squeegee 103 in the Z-axis direction. In screen printing, a paste 104 is provided between a squeegee 103 and a screen 105, and the paste 104 passes through a through hole of the screen 105 and is attached to a sheet 106, that is, printed.

[0006] Here, as wiring becomes finer in the future, in addition to the force P in the Z-axis direction in FIG.
The tension T of the screen 105 is an important factor.

In the prior art, there is no example in which the tension T of the screen 105 is made constant or the tension T of the screen 105 is made variable in accordance with the situation of the squeegee 103 or the like.

[0006]

In the conventional example, there is no means for controlling the tension T of the screen 105. That is, the tension
There is no means for controlling such as making T constant or changing the tension T according to the position of the squeegee 103 and the like. In other words, the tension T of the screen 105 is left as it is even though the value of the tension T at the time of purchase is different from the value of the tension T after the number of times of use. In printing, for example, when the squeegee 103 is at the printing start end as shown in FIG. 6, the mesh opening ratio (the ratio of the area of the through hole 108 in FIG. 5 to the entire area of the screen) is low. When the mesh opening ratio is high at the printing end end as shown in FIG. 7, finer printing can be realized by setting the tension T to an appropriate value at each of the starting end and the ending end. Nevertheless, the tension T could not be controlled.

Therefore, an object of the present invention is to control the tension T to an appropriate value for realizing fine printing during screen printing.

[0008]

In order to achieve this object, as shown in FIGS. 1 and 2, in the present invention, two sides 113 of four sides surrounding a screen 105 are formed as leaf springs. Further, a feature is that the force in the X-axis direction is detected by a spring 115 and the force in the X-axis direction, that is, the tension T can be force-controlled by the motor 119 based on this value.

When the tension T falls below a predetermined target value, the spring 115 becomes short and detects that the spring 115 has fallen. Next, based on the detected value, the motor 119
Works to set the tension T to a target value. Conversely, when the tension T exceeds a preset target value, the spring 115 is detected to be longer and longer. Next, based on the detected value, the motor 119 operates to cancel the detected value, and the tension T is set to a target value. Thus, the tension T of the screen 105 is
Can be controlled to an appropriate value.

[0010]

Next, embodiments of the present invention will be described in detail.

First, a first embodiment will be described with reference to FIGS.

In FIGS. 1 and 2, the screen 105 is
It is configured to be surrounded by four sides of a side A111, a side B112, and two leaf springs 113. Of these four sides, side A111 has high rigidity and is fixed, and side B112 has high rigidity but is not fixed and is directly connected to link 117. On the other hand, the two leaf springs 113 have low rigidity and a flexible structure. Therefore, according to the tension T in the X-axis direction, the screen
The 105 and the two leaf springs 113 have a function of extending slightly in the X-axis direction.

First, the tension T is detected by the spring 115. Tension T
However, when the value falls below the target value, the side B112 slightly moves with respect to the component A in the positive direction of the X axis. Link 117 directly connected to side B112
Moves in the same manner, and the component B116 minutely moves in the positive direction of the X-axis, thereby shortening the spring 115 and detecting that the tension T falls below the target value. Next, based on the detected value, the motor 11
9 operates and moves part A114 via screw 118, tension
Let T reach the target value.

When the tension T falls below the target value, the operation is performed in the same manner as described above (but in the opposite direction), and finally the tension T reaches the target value.

With the above operation, a predetermined tension T pattern can be executed from the start of printing shown in FIG. 6 to the end of printing shown in FIG. For example, in the case of a pattern in which the tension T is constant from the start point to the end point irrespective of the position of the squeegee 103 as shown in FIG. 8, the tension T is changed according to the position of the squeegee 103 as shown in FIG. There are cases where the pattern is changed. In addition, as shown in FIG. 10, the tension is applied not from the position but from the start to the end, regardless of the time.
There may be a pattern in which T is constant or a pattern in which the tension T is changed according to time, as shown in FIG.

Next, a second embodiment will be described with reference to FIG.

In the first embodiment, the tension T is controlled with respect to the screen 105 to realize printing with a fine wiring width.
An example in which the tension T is appropriately set during screen printing has been described. In the second embodiment, in addition to the screen tension control of the first embodiment, the screen angle (the screen 1 shown in FIG.
This is an example having a function of controlling the angle θ) formed between 05 and the sheet 106. In the conventional example, the screen angle θ1 at the start of printing as shown in FIG. 6 is different from the screen angle θ2 at the end of printing as shown in FIG. In order to realize higher fine wiring printing, it is important to control the angle θ of the screen. The control of the angle θ of the screen is performed according to the first embodiment.
Is added to the second embodiment, which will be described in detail with reference to FIG.

For example, the angle of the screen at the time of printing is fixed including the angle θ1 of the screen at the start of printing as shown in FIG. 6 and the angle θ2 of the screen at the end of printing as shown in FIG. When implementing the control that
Proceed as follows. In the prior art, since θ1 <θ2, it is necessary to move the side B112 in FIG. 3 in the negative direction of the Z axis during printing. Hereinafter, this operation will be described. First,
A table (not shown) showing the relationship between the position X of the squeegee 103 in the X-axis direction and the corresponding screen angle θ is created in advance. Further, a table (not shown) showing the relationship between the screen angle θ1 and the corresponding position Z in the Z-axis direction of the component C121 is created. Thereafter, printing is started, that is, the squeegee 103
When the operation in the axial direction is started, the Z-axis position of the component C121 relative to the X-axis position of the squeegee 103 (in other words, the target value of the component C121) is calculated based on these tables. The motor 123 is operated to reach the target value, and the component C121 is moved up and down via the screw 122, so that the component C121 reaches the target value.

By the above-described operation, a predetermined tension T pattern is executed from the start of printing shown in FIG. 6 to the end of printing shown in FIG.
A pattern (not shown) of a predetermined screen angle θ can be executed. The angle θ of this screen
Is also established as a pattern corresponding to the X-axis position of the squeegee 103 at the start of printing, and is also established as a pattern corresponding to the time after the start of printing, similarly to the content shown by the pattern of the tension T. .

[0020]

As is clear from the above description, according to the present invention, the screen tension can be appropriately controlled in the screen printing, and the angle between the screen and the sheet is also properly controlled at the same time. Things can be realized.
This can provide a powerful means for enabling fine wiring width printing required in the future.

[Brief description of the drawings]

FIG. 1 is a front view of a first embodiment of the present invention.

FIG. 2 is a side view of the first embodiment of the present invention.

FIG. 3 is a front view of a second embodiment of the present invention.

FIG. 4 is a schematic diagram of a conventional invention.

FIG. 5 is an enlarged view of a main part of screen printing.

FIG. 6 is an explanatory diagram at the start of screen printing.

FIG. 7 is an explanatory diagram at the end of screen printing.

FIG. 8 is a diagram showing a first example of a tension pattern from a printing start point to an end point in screen printing.

FIG. 9 is a diagram illustrating an example 2 of a tension pattern from a printing start point to an end point in screen printing.

FIG. 10 is a diagram showing a first example of a tension pattern from the start of printing to the end of screen printing.

FIG. 11 is a diagram showing a tension pattern example 2 from the start of printing to the end of screen printing.

[Explanation of symbols]

101 motor, 102 spring, 103 squeegee, 104 paste, 105 screen, 106 sheet, 107 base, 108
... through-hole, 111 ... side A, 112 ... side B, 113 ... leaf spring, 114 ...
Part A, 115… Spring, 116… Part B, 117… Link, 118…
Screws, 119 ... Motor, 120 ... Guide, 121 ... Part C, 122 ...
Screw, 123… motor, 124… base.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshitaka Tsutsui 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Hitachi, Ltd.Production Technology Laboratory (72) Inventor Masasaku Ishihara 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Inside Hitachi, Ltd. Production Technology Research Laboratory (72) Inventor Masahide Okamoto 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Hitachi Production Co., Ltd. (72) Inventor Takashi Kuroki Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture 292 Hitachi Manufacturing Co., Ltd. Production Technology Research Laboratories (72) Inventor Masato Kirigaya 292 Yoshida-cho Totsuka-ku, Yokohama-shi, Kanagawa Prefecture F-term in Hitachi Manufacturing Co., Ltd. Production Technology Research Laboratories 2C035 AA06 FD01 FD02 FD08 FE04 FF06

Claims (2)

[Claims] 1. A screen and a sheet under the screen,
The paste is placed on the screen, and the squeegee moves from one end of the screen to the other end while pressing the paste against the screen. In screen printing in which the paste is applied to the sheet, the position of the squeegee being printed and after the start of printing The screen tension can be controlled according to the time of the screen printing. 2. Placing a screen and a sheet under the screen,
The paste is placed on the screen, and the squeegee moves from one end of the screen to the other end while pressing the paste against the screen. In screen printing in which the paste is applied to the sheet, the position of the squeegee being printed and after the start of printing A screen printing method according to a first feature that the tension of the screen can be controlled in accordance with the time of the second time, and that the angle formed between the screen and the sheet can be controlled at the same time as a second feature.