JPS58173692A - Screen printing method - Google Patents

Abstract

PURPOSE:To precisely control the thickness of a printing film, by moving a squeegee in such a state that a printing material is arranged to the leading end surface of the squeegee and the surface of a screen. CONSTITUTION:A printing material 12 such as a carbon paste is placed on a screen 11 having a desired printing pattern formed thereto and a squeegee 13 is moved in such a state that the printing material 12 is stored in the acute angle part formed by the leading end surface of the squeegee 13 and the surface of the screen 11 to carry out screen printing. A reinforcing plate 14 is provided to the upper surface of the squeegee 13 to prevent the deformation thereof. Because the printing material 12 is printed by pushing force applied to the squeegee 13, the printing material 12 can be uniformly extruded from the screen 11 but, by changing the angle theta formed by the squeegee 13 and the surface of the screen 11, the thickness of a printing film can be adjusted. Because the moving distance of the squeegee 13 can be shortened, the shortening of a printing time can be attained.

Description

[Detailed description of the invention] The present invention relates to improvements in screen printing methods.

In the conventional screen printing method, as shown in FIG.
) The printing material (2) is placed at the acute angle formed by the side surface of the screen and the screen surface, and the squeegee (3) is moved to perform screen printing.

The screen printing method is the most popular method, and the printing accuracy of the second grade can be fully achieved with hybrid integrated circuits. However, in highly accurate -j control of the resistance value of the resistor using carbon paste, considerable variation occurs when looking at the ratio of the angle of the squeegee (3) to the film thickness m, as shown by the nine-dot line in FIG. Therefore, precise control of printing film thickness and printing of ultra-fine patterns are difficult to achieve with screen printing.

The present invention was developed with this in mind, and is intended to realize screen printing that greatly improves the drawbacks of conventional methods. less than@
An embodiment of the present invention will be described in detail with reference to FIGS. 2 and 183.

The screen printing method according to the present invention has the greatest feature in using the front end surface of the squeegee g field.

That is, as shown in Fig. 2, a printing material such as carbon paste is placed on the screen printing on which the desired printing pattern has been formed, and a squeegee (an acute angle part formed by the tip surface of the squeegee (1'4) and the screen surface Collect the printing material 4 and move the squeegee 01 to perform screen printing. If necessary, provide a reinforcing plate as shown on one side of the squeegee to prevent deformation of the squeegee. do.

According to the above method, as shown by the solid line in FIG. 6, the film thickness by printing can be controlled in positive aIK over a wider range than before. The reason for this is not clear.The conventional method uses the force of pulling the squeegee to print the printing material PH, whereas the method of the present invention uses the force of pushing one end of the squeegee to print the printing material Q.
11. Screen (
This is thought to be due to extrusion from 11). Therefore, in the present invention, when the angle θ between the squeegee mist and the screen surface is the same, the force of the present invention results in a thicker film than in the prior art. However, in the present invention, by changing the angle 0, printing can be performed with the same film thickness as in the past.

There are various advantages of using the present invention, but firstly, as described above, the film thickness can be controlled over a wider range than by changing the angle θ. In this embodiment, it can be controlled within a range of approximately 14 to 60μ. If this method is applied to printing of a layered resistor, the resistance value can be easily controlled.

In the present invention, the travel path #i of the squeegee-Q field can be made shorter than that of the conventional method. The reason for this is that in the conventional method, since printing is performed using a pulling force, it is necessary to support the squeegee-l field until the frW pattern ρ is sufficiently VC separated from the pattern ρ. As a result, the present invention can shorten printing time and reduce the amount of printing material used. The short moving distance ensures printing stability.

Fifth, the present invention allows for constant control of film thickness.
When printing resists such as 4-conductor circuits, the distance between adjacent conductive circuits can be narrowed, and it is possible to print fine patterns with intervals of approximately 70 μm.

[Brief explanation of the drawing]

FIG. 1 is a sectional view for explaining the conventional method, FIG. 2 is a sectional view for explaining the present invention, and FIGS. 1 to 6 are characteristic diagrams for comparing the present invention and the conventional method. (The river is a screen, 0 is a printing material, (11 is a squeegee, and 1 is a reinforcing plate.

Claims (1)

[Claims] 1. In a screen printing method in which a desired pattern is printed by placing a printing material on a screen provided with a desired printing pattern and moving it while pressing it with a squeegee, A screen printing method characterized by arranging and moving printing materials.