JP3198786B2 - Screen printing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen printing method in which a squeegee is moved from one end to the other end of a screen arranged on a printing material to apply a thick film paste on the printing material. .

[0002]

2. Description of the Related Art Conventionally, in this type of screen printing method, as shown in FIGS.
A screen 2 is provided at a predetermined interval on a printing substrate 1 such as a ceramic substrate constituting C, and the screen 2 is moved from one end side of the screen 2 as shown in FIG. The squeegee 3 is moved at a constant speed to the other end of the screen 2 at the end point of the movement of the squeegee 3 as shown in FIG. Printing.

[0003] When the thick film paste 4 is a resistance paste, a resistance pattern is printed on the substrate 1. When the thick film paste 4 is a conductor paste, a wiring pattern is formed on the substrate 1. When the thick film paste 4 is printed and the glaze paste is used, an insulating film is printed on the printing substrate 1.

[0004]

However, as shown in FIG. 3, the squeegee 3 is moved to the screen 2 on the starting point side.
And the angle θ1 between the screen 2 and the printing medium 1 when the squeegee 3 is at the other end of the screen 2 at the end point of the movement, as shown in FIG. The angle θ2 with the print substrate 1 is θ1 <θ2
In a relationship.

[0005] Therefore, as shown in FIG.
Is located on one end side of the screen 2 which is the starting point side, the distance between the screen 2 and the printing medium 1 becomes narrow,
The discharge amount of the thick film paste 4 from the screen 2 is reduced, and printing blur is likely to occur. Further, as shown in FIG. 4, when the squeegee 3 is located on the other end side of the screen 2 which is the end point side, the distance between the screen 2 and the printing substrate 1 is increased, and the screen 2 of the thick film paste 4 As a result, there is a problem in that high-resolution printing cannot be performed over a wide area of the printing substrate 1 as a result of the increased discharge amount of printing.

Accordingly, it is an object of the present invention to provide a screen printing method capable of performing high-resolution printing over a wide area of a printing substrate.

[0007]

In order to achieve the above object, in the screen printing method according to the present invention, the moving speed of the squeegee is set to one end of the screen, which is the starting point of the movement, at the end of the moving. The screen is faster than the other end, and is slower at the other end than the one end.

[0008]

When the moving speed of the squeegee is high, the discharge amount of the thick film paste from the screen increases, and when the moving speed of the squeegee is low, the discharge amount of the thick paste from the screen decreases. For this reason, printing blur is less likely to occur on one end of the screen, which is the starting point side of the squeegee movement, where printing blur is likely to occur, and printing blur is generated on the other end side of the screen, which is the end point of the movement of the squeegee, where printing blur is likely to occur. Is less likely to occur, and high-resolution printing can be performed over a wide area of the printing substrate.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a squeegee 3 shown in FIG. 3 and FIG.
3 shows a speed change of the squeegee 3 according to the embodiment of the present invention between the start point and the end point of the movement of the squeegee. In this embodiment, the squeegee 3 is moved at a substantially constant speed at the intermediate position of the printing medium 1 shown in FIGS. 3 and 4, so that the squeegee 3 is faster than the intermediate position on the starting point side and becomes slower as approaching the intermediate position. At the end point side, and at a speed that draws a curve that becomes slower as it approaches the end point.

FIG. 2 shows another embodiment of the present invention. The squeegee 3 is decelerated at a constant rate with the movement of the squeegee 3 when the squeegee 3 moves faster at the start point than at the end point, slower at the end point than at the start point. Move at a speed that shows the change

In any of the above embodiments, when the speed of the squeegee 3 is high, the discharge amount of the thick film paste 4 increases in accordance with the speed, and when the speed is low, the discharge amount of the thick film paste 4 increases. Accordingly, printing blur is less likely to occur on one end side of the screen 2 which is the starting point side of the movement of the squeegee 3 where the printing blur is likely to occur, and the screen which is the end point side of the movement of the squeegee 3 where the printing blur tends to occur. Also on the other end side of 2, printing bleeding hardly occurs, and high-resolution printing can be performed in a wide area of the printing material 1.

[0013]

As is apparent from the above description, according to the screen printing method of the present invention, the moving speed of the squeegee is increased at one end of the screen at the starting point of the movement, and at the end of the screen at the ending point of the moving. Faster than the other end,
Since the other end is slower than the one end, it is possible to perform high-resolution printing over a wide area of the printing medium.

[Brief description of the drawings]

FIG. 1 is a diagram showing a change in the speed of a squeegee between a start point and an end point of movement of the squeegee according to the embodiment of the present invention.

FIG. 2 is a diagram illustrating a change in the speed of a squeegee between a start point and an end point of movement of the squeegee according to another embodiment of the present invention.

FIG. 3 is a diagram for explaining a screen printing method.

FIG. 4 is a diagram for explaining a screen printing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printed matter 2 Screen 3 Squeegee 4 Thick film paste

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B41F 15/00-15/46 B41M 3/12 H05K 3/12

Claims (1)

(57) [Claims] 1. A screen printing method in which a squeegee is moved from one end to the other end of a screen placed on a printing material to apply a thick film paste on the printing material, wherein the moving speed of the squeegee is On the one end side of the screen which is the starting point side of the movement, it is faster than the other end side of the screen which is the ending point side of the movement, and on the other end side, it is slower than the one end side. Screen printing method.