JPH0472366B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a laminated inductor and a screen used for printing the same, and more particularly to a method for forming a conductor pattern and a screen therefor.

[Prior art]

Following the trend of electronic components becoming lighter, thinner, shorter and smaller, in the field of inductors (coils), we are developing products that do not use windings.
Multilayer inductors, in which a magnetic ceramic and a conductor are integrally fired, have come into use.

This multilayer inductor is made by alternately screen printing ferrite magnetic paste and Ag-Pd conductor paste, forming a conductor pattern inside the magnetic layer that overlaps and circles in the lamination direction while connecting the ends. .

〔assignment〕

As described above, since the ends of the laminated inductor conductor patterns are stacked while being connected, printing is performed while forming steps. That is, as shown in FIG. 1, the magnetic layer 10 has a convex part 12 and a concave part 13, and the conductor pattern 15 formed in the concave part 13 is
In the next step, as shown in FIG. 2, it is connected to the conductor pattern 16 formed on the convex portion 12.

At this time, a screen for printing the conductive pattern 16 is used, but the surface of the magnetic material 10 has irregularities, and when the screen is brought into contact with this and rubbed with a squeegee, the screen stretches.

This elongation of the screen is a major cause of misalignment of patterns during printing, and misalignment of printed patterns leads to a decrease in yield and, in terms of characteristics, to an increase in resistance.

The present invention prevents such misalignment of conductor patterns and improves the accuracy of printed patterns.

[Means to solve the problem]

The present invention solves the above problem by varying the thickness of the emulsion of the screen used to print the conductor pattern in accordance with the unevenness of the surface of the magnetic material.

That is, in a method for manufacturing a laminated inductor in which a conductor paste and a magnetic paste are alternately printed by a screen printing method to form a conductor pattern circulating in a magnetic layer, the magnetic material is printed on a screen for screen printing. It is characterized by applying emulsions with different thicknesses depending on the unevenness of the surface of the layer, removing the conductive pattern part, and printing conductive paste on the magnetic layer through a screen coated with emulsions of different thicknesses. It is something.

In addition, in a screen on which an emulsion is applied and a conductive pattern printed portion is removed for printing conductive paste on a magnetic layer, the thickness of the emulsion varies depending on the unevenness of the surface of the magnetic layer. It is characterized by the fact that it is formed.

[Effect]

By forming the emulsion thicker in the areas that hit the recesses on the surface of the magnetic material and thinner in the areas that hit the convex parts, the screen can be brought into contact with the magnetic material surface and rubbed with a squeegee, keeping the surface of the screen flat. moves. Even when the squeegee is positioned in the recess, the screen does not stretch, making it difficult for the conductor pattern to shift.

〔Example〕

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

FIG. 3 is a partial perspective view showing an example of a screen used to implement the present invention. Emulsion is applied to the stencil, but depending on the unevenness of the surface of the magnetic material to be printed, parts with different thicknesses are formed, such as a thin part 32 with the emulsion and a part 33 with the thick emulsion. There is.

A photosensitive emulsion such as a diazo emulsion or an acrylic emulsion is applied, and after drying, patterned portions are removed according to the conductor pattern to form a screen. Normally, in a multilayer inductor, the unevenness formed on the surface of the magnetic layer is about 20 microns, so the thickness of the emulsion is also about 20 microns in thick and thin parts.
It is sufficient to apply it so that there is a difference of about microns. This is possible by varying the number of applications.

The thick emulsion portion 33 of the screen shown in FIG. 3 is placed in contact with the recess 13 of the magnetic layer shown in FIG. After alignment, a conductor pattern is printed. Therefore, the removed portion corresponding to the conductor pattern is located in the thinly formed portion 32 of the emulsion. However, for connection,
One of the ends must span the thickened portion 33 of the emulsion.

Since there are two or more types of conductor patterns, multiple screens corresponding to the types are prepared and used by switching sequentially. Of course, a screen for the magnetic layer is also required.

If a conductor pattern is formed using the screen as described above, the conductor pattern 16 connected to the end of the conductor pattern 15 can be formed without any positional shift, as shown in FIG. After that, a magnetic paste is printed in the recesses 13 of the magnetic layer, and then a conductive pattern is printed on the surface thereof. By repeating this process, magnetic layers and conductive patterns are alternately laminated to obtain a coil pattern.

〔effect〕

According to the present invention, the printing accuracy of conductive patterns can be improved and positional deviation can be prevented.

Thereby, the production yield can be significantly improved.

It is also effective in preventing wire breakage and increasing resistance, significantly improving characteristics, and being advantageous in terms of stability of characteristics.

[Brief explanation of drawings]

1 and 2 are partial perspective views showing a method of manufacturing a laminated inductor, and FIG. 3 is a partial perspective view of a screen used in carrying out the present invention. 12... Convex portion, 13... Concave portion, 15, 16...
Conductor pattern, 32...Thin portion of emulsion, 33...
...the thick part of the emulsion.

Claims (1)

[Scope of Claims] 1. A method for manufacturing a laminated inductor in which a conductor paste and a magnetic paste are alternately printed by a screen printing method to form a conductor pattern circulating in a magnetic layer. Applying an emulsion of different thickness to the surface of the screen in contact with the magnetic layer so that convex portions and concave portions are formed opposite to the irregularities on the surface of the magnetic layer, and removing the emulsion from the conductor pattern portion, A method for manufacturing a laminated inductor, comprising printing a conductor pattern on a magnetic layer through a screen coated with emulsions of different thicknesses. 2. The method of manufacturing a laminated inductor according to claim 1, wherein a plurality of the conductive pattern printing screens are used to connect the conductive patterns and print them alternately with the magnetic layers. 3. In a screen on which an emulsion is applied and a conductive pattern printed portion is removed for printing a conductive paste on a magnetic layer, the thickness of the emulsion is different, and the unevenness opposite to the unevenness on the surface of the magnetic layer is magnetic. A screen characterized by being formed on the side that contacts the body layer.