JPS5812394A - Screen printing method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a screen printing method, and particularly to electronic components such as mechanical contact type potentiometers, etc., which are effective for printing linear patterns. When selectively formed to form contacts for sliding contacts, such conductive layers are often formed by screen printing techniques.

The conductive layer of the potentiometer is formed into an arcuate pattern having a predetermined width W, as shown in No. 15iiK, since the sliding contact rotates to make contact. In the figure, 11 is an insulating substrate, and 12 is a conductive layer.

Conventionally, when forming such a conductive layer, a conductive layer pattern 2 is placed on a screen mask as shown in FIG.
The conductive layer is formed by operating the spacer parallel to the center @XX/ passing through the center 0 of the 10-circular arc. However, in such a screen printing method, for example, it is difficult to use the screen printing method. The width of the pattern opening relative to the Mekhizi is 11, while at position B it is 1. and is constantly changing.

For this reason, the printing pressure on the printing pattern of the substrate is not constant, and the thickness of the printed conductive layer paste is uneven (
This results in a variation of 6 to 7 [chi] in terms of voltage, which leads to a decrease in manufacturing yield and reliability in the hot-temperature meter.

The present invention eliminates the drawbacks of such conventional methods and
It is an object of the present invention to provide a screen printing method that can form a conductive layer pattern having a uniform thickness even when printing KII of an am-shaped pattern.

Therefore, according to the present invention, in a method of screen printing a layer having a curved pattern on a substrate to be processed, the center of rotation of the curved pattern and the center of one rotation of the squeegee are aligned, and the squeegee or A one-screen printing method is provided for driving at least one of the substrates to be processed.

Below is the invention! This will be explained using Example J.

According to the present invention, as shown in FIG. 3, the conductive layer pattern 310 is rotated on the screen mask along the arc of the conductive layer pattern 310, that is, on the conductive layer pattern 31 with the center O of the conductive layer pattern 31 as the rotation center. A squeegee (not shown) having a width Ws wider than the width W of the conductive layer pattern 310 is operated. At this time, the squeegee may be fixed and the substrate to be printed may be moved.

According to this method, the width of the conductive layer pattern opening relative to the squeegee is always constant W, and the printing pressure of the squeegee against the printed pattern is constant. Therefore, the thickness of the printed conductive paste can be made uniform.

According to the present invention, it is possible to form a film with a thickness of 2 on a ceramic substrate.
0 [μm] carbon paste (carbon particles mixed with diallyl phthalate Kfj
) with a side length of 17.51 mm), the IIM no.
0 [chi] was obtained, and no post-processing such as trimming was required.

FIG. 4 shows a screen printing apparatus according to the present invention.

In the figure, 41 is a turntable, and 42 is a motor that rotationally drives the turntable 41 via a belt 43. Further, 44 is a screen (mask) having an arc-shaped butter 745 placed on the turntable 41. A squeegee 147 disposed on the arcuate pattern 45 is an arm that supports the squeegee 46 at a fulcrum 48 so as to be movable up and down.

In such a screen printing apparatus, the paste (not shown) placed on the screen 44 is applied onto the screen 44 by moving the relative position of the squeegee as the turntable 410 rotates. The arc-shaped pattern is printed on a substrate to be processed (not shown) placed under the substrate 44 . Furthermore, squeegee-4
The printing pressure of No. 6 is adjusted by adding a plow to the arm 47.

Further, FIG. 5 shows another embodiment of the screen printing apparatus.

In the structure shown in the figure, a substrate to be processed 52 is accommodated on a table 51, and a screen (mask) 53 is arranged on the table 511. An arcuate pattern is drawn on the screen (mask) 53. The squeegee 54 has an arm 55 supported by a support plate 56 and rotationally driven by a motor 57.

Furthermore, the pressure is applied to the squeegee 54 by an air cylinder disposed on the arm 55! 58.

In such a screen printing device, table 5
1 is easy to move, and the substrate to be processed can be easily attached and detached.

As described above, according to the present invention, even when printing a curved pattern, a predetermined pattern can be printed with a uniform film thickness.

In the above embodiments, a potentiometer was used for explanation, but the present invention is not limited to this, and can be applied to printing of other members having at least a partially curved pattern. can do.

[Brief explanation of the drawing]

Stripe 1 is the shape of the contact part of the potentiometer; d is the plan view;
#! Figure 2 is a plan view showing the conventional screen printing method, #
! FIG. 3 is a plan view showing a screen printing method according to the present invention, and FIGS. 4 and 5 are an external perspective view and a sectional view showing the structure of a screen printing apparatus according to the present invention. In the figure, 11... insulating substrate, 12... conductive layer. 21.31... Conductive layer pattern. Hand l Figure 2 Figure 3

Claims (1)

[Claims] In a method of screen printing a layer having a curved pattern on a substrate to be treated, the center of rotation of the curved pattern and the center of rotation of a squeegee are aligned, and at least one of the squeegee or the substrate to be treated is A screen printing method characterized by driving.