JPH0286497A - Squeegee for screen printing - Google Patents

Abstract

PURPOSE:To facilitate flattening of the surface of a printing base and reduce wear of a squeegee by providing the squeegee with a flat surface parallel to the printing base, and moving the squeegee in parallel to the surface of the printing base while maintaining the flat surface in surface contact with a screen. CONSTITUTION:A squeegee 15 for printing a plurality of pastes 17 in a multiplicity of layers on a printing base 10 has a flat surface parallel to the surface of the printing base 10, namely, to the surface of a screen 16. With the flat surface maintained in surface contact with the screen 16, the squeegee 15 is moved in parallel to the surface of the printing base 10, whereby the screen 16 is pressed against the printing base 10, and the paste 17 placed on the screen 16 is rubbed against the surface of the printing base 10 to achieve screen printing.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is used for screen printing of electronic components such as laminated inductors, etc., particularly on the printed substrate surface where unevenness is likely to occur when laminated in multiple layers. It's about a squeegee.

[Prior art]

Screen printing technology is used in various fields, and recently it has been used to manufacture printed laminated parts such as laminated inductors and laminated capacitors. These electronic components are printed with multiple layers of alternating conductive paste and insulating paste (ferrite, dielectric ceramic).

In particular, in the case of a laminated inductor, as shown in FIG. 2, the conductor pattern 21 is formed while connecting the layers of the ferrite 22, so it must be printed on the surface of the printed substrate with steps (irregularities).

FIG. 3 is a front sectional view showing a state in which screen printing is performed on the surface of a printing substrate having steps as described above. The printing substrate 30 has steps (irregularities), and the squeegee 25 presses the screen 26 and moves from left to right in the figure to rub the paste 27 onto the surface of the printing substrate 30.

As the squeegee 25 moves and the screen 26 leaves the printed substrate surface, paste is left on the surface.

A squeegee with a pointed tip is used to rub the paste. There are those that are formed at an acute angle as shown in Figure 3, and those that are formed at right angles and are used with an inclined portion.

However, in any case, as shown in FIG. 3, when printing in the recessed portion 30a of the printing substrate 30, the paste to be printed on this portion may be scraped out. This makes it difficult to flatten the printing surface, and especially when printing in multiple layers, the layers are repeatedly stacked without being flattened.
This poses a major problem in terms of yield and reliability.

〔assignment〕

The present invention aims to provide a screen printing squeegee that can maintain flatness even after repeated printing in multiple layers.

This is intended to enable the manufacture of laminated electronic components with high yield and reliability.

[Means to solve the problem]

The present invention solves the above problems by improving the shape of a screen printing squeegee.

In other words, in a screen printing squeegee for printing multiple layers of paste on a printing substrate, the squeegee has a plane parallel to the printing substrate and moves parallel to the surface of the printing substrate while making surface contact with the screen. This method is characterized in that the screen is pressed against the printing substrate to print the paste.

Also, make the dimension in the moving direction thicker than the interval between the concave and convex portions.
This makes it possible to make the surface even more flat.

〔Example〕

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

FIG. 1 is a perspective view showing an embodiment of the present invention, showing only the main parts. Irregularities (steps) on the surface of the printing substrate 10
is formed. A paste 27 is printed on the surface of this printing substrate 10 through a screen 16. The paste 17 placed on the screen 16 is rubbed with a squeegee 15.

The squeegee 15 has a flat surface that comes into contact with the screen 16. That is, a surface parallel to the surface of the printing substrate 10 is formed, and this surface contacts the screen 16 and moves in a direction parallel to the surface of the printing substrate 10.

A taper is provided in the advancing direction (right side in this example), and the paste 17 is passed through the screen 16 at the tapered part.
It is rubbed onto the surface of the printing substrate 10 through the . of course,
A pattern is formed on the screen 10 using emulsion, and the pattern of the paste to be printed is determined according to this pattern.

The dimension of the squeegee 15 in the advancing direction is preferably larger than the interval W between the convex portions of the printing substrate 10. This can prevent the squeegee 15 from scraping out the paste in the recesses 10a of the printing substrate 10. Therefore, the printing surface is flattened.

For example, in the case of a laminated inductor, several dozen elements are formed on a single substrate. Since the conductor patterns are arranged regularly in the vertical and horizontal directions, the dimensions of the squeegee can be determined according to the spacing between the arrangement.

〔effect〕

According to the present invention, it is easy to flatten the surface of the printed substrate.

Therefore, even when laminating multiple layers, a laminate with good yield can be obtained without distortion.

This also greatly improves the reliability of laminated electronic components.

Furthermore, since the contact surface of the squeegee is flat, the amount of wear is reduced even if the squeegee is used many times.

Furthermore, since the elongation of the screen during printing is small, pattern shift is less likely to occur, which is also advantageous in terms of yield and reliability.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a perspective view showing the manufacturing process of a printed laminated component, and FIG. 3 is a perspective view showing a conventional screen printing squeegee. l0120... Printing base 15.25... Squeegee 16.26... Screen 17.27... Paste

Claims (6)

[Claims] (1) A screen printing squeegee for printing multiple layers of paste on a printing substrate has a plane parallel to the printing substrate, and the plane is parallel to the surface of the printing substrate while making surface contact with the screen. A screen printing squeegee that moves and presses a screen against a printing substrate to print paste. (2) The screen printing squeegee according to claim 1, wherein an inclined surface is provided in the advancing direction. (3) A screen printing squeegee for printing paste on a printing substrate with an uneven surface, which has a plane parallel to the printing substrate, and the plane is parallel to the surface of the printing substrate while making surface contact with the screen. A screen printing squeegee that moves and presses a screen against a printing substrate to print paste. (4) A screen printing squeegee for printing paste on a printing substrate having multiple irregularities, which has a plane parallel to the printing substrate, and the plane is parallel to the surface of the printing substrate while making surface contact with the screen. Along with moving to
the dimension of the surface in the moving direction is larger than the interval between the concavities and convexities;
A screen printing squeegee that prints paste by pressing a screen against a printing substrate. (5) A squeegee for screen printing used to manufacture multiple electronic components by alternately printing and laminating conductors and insulators and arranging them on a printed substrate, which has a plane parallel to the printed substrate and has a flat surface parallel to the printed substrate. A squeegee for screen printing, characterized in that its surface moves parallel to the surface of a printing substrate while making surface contact with the screen, presses the screen against the printing substrate, and prints conductor and insulating paste. (6) The screen printing squeegee according to claim 5, wherein the dimension in the moving direction is larger than the arrangement interval of the electronic components.