JP2937781B2 - Manufacturing method of multilayer inductor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a laminated inductor, and more particularly to a method for manufacturing a laminated inductor in which ceramic green sheets on which conductor patterns are formed are laminated and the conductor patterns are connected to each other through through holes. It is about.

[0002]

2. Description of the Related Art In order to meet demands for miniaturization and thinning, multilayer inductors are widely used in the field of inductors. This is to form a coil conductor that is superimposed in the laminating direction by sequentially connecting conductor patterns of about half a turn formed between layers of the ceramic laminate.

[0003] There are roughly two types of manufacturing methods for multilayer inductors. One is formed by alternately printing a conductor pattern and an insulating layer, and the conductor pattern is connected at an end of each layer. The other is to stack the ceramic green sheets on which the conductor patterns are formed, and to fill the through holes formed in the green sheets with a conductor to connect the conductor patterns.

In the case of employing a method of laminating the sheets, the conductor patterns cannot be connected to each other unless the conductor is filled in a through hole formed in the green sheet by punching or the like. Therefore,
In addition to the printing of the conductor pattern, a step of filling the through-hole with the conductor is required, and the work must be performed carefully to ensure the connection.

[0005]

SUMMARY OF THE INVENTION The present invention reduces the number of manufacturing steps for a type of laminated inductor in which conductor patterns are connected through through holes, and provides a laminated inductor in which conductor patterns are reliably connected to each other. Things.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems by partially forming a conductive pattern formed by printing on a ceramic green sheet.

That is, manufacturing of a laminated inductor in which a conductor pattern for a coil of about a half turn is formed on a ceramic green sheet, and the conductor pattern for a coil is sequentially connected through a through hole of the ceramic green sheet to form a conductor pattern that circulates. Method, before the lamination stage
This is characterized in that the thickness of the conductor pattern at the portion facing the through hole of the adjacent ceramic green sheet is thicker than the other portions of the conductor pattern.

[0008]

The conductor is filled in the through-hole by fitting the thickly formed portion into the through-hole and laminated, and the conductor patterns of the respective green sheets are connected by firing.

[0009]

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

FIG. 1 is a partial perspective view showing an embodiment of the present invention. The magnetic green sheets 10a, 10b, 10c... Made of a magnetic material such as ferrite or a non-magnetic material are laminated so that a conductor pattern having a predetermined number of turns can be obtained. In practice, ceramic green sheets formed by arranging a large number of conductor patterns are stacked and pressed and cut to obtain individual elements.

On the ceramic green sheet 10, conductor patterns 11a, 11b, 11c,... For about a half turn are printed and formed. Usually, it is formed in a predetermined pattern by screen printing. For convenience, a square pattern is shown in the drawing, but it is usually formed in a circular or oval shape.

A through hole 12 is provided at one end of the conductor pattern 11.
a, 12b, 12c,... are formed. The upper and lower conductor patterns are connected through these through holes to form a continuous coil conductor. This through hole is formed in the green sheet by a method such as punching. When a conductor pattern addressed to a half turn is formed, the position of the through hole alternates.

In the present invention, the other ends 15a, 15b, 15c,... Of the conductor pattern 11 are made thicker than the other portions. This is formed by printing and drying the conductor pattern 11 and then repeating printing only on this portion. It is necessary that the thick portion and the position of the through hole substantially coincide with each other.

The ceramic green sheet on which the conductor pattern and the through hole are formed as described above is overlapped and laminated so that the thick portion of the end of the conductor pattern and the through hole coincide with each other, and are pressed. At this time, the thick portion of the conductor pattern is fitted into the through hole, and the through hole is filled with the conductor. For that purpose, it is desirable to make the thickness of the end of the conductor pattern as large as possible.

After lamination and pressure bonding, the ceramic green sheet is divided into elements and fired. During this firing, the conductor located in the through hole is melted and solidified to connect the conductor patterns on both sides of the sheet. As a result, a conductor pattern that circulates inside the laminate is formed. The inductor is completed by burning the terminal electrodes.

The present invention can be used not only for general laminated inductors in which sheets are laminated and a conductor pattern is connected by through holes, but also for forming inductor parts such as LC composite parts.

[0017]

According to the present invention, the work of filling the through-hole with the conductor becomes unnecessary, and the number of steps can be reduced. Also, since the work requires careful attention and confirmation, the burden on the operator can be reduced.

Further, since a certain amount of the conductor is reliably filled in the through-hole, the connection between the conductor patterns is ensured, and a laminated inductor excellent in reliability can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

[Explanation of symbols]

 10: Ceramic green sheet 11: Conductor pattern 12: Through hole 15: Tip of conductor pattern

Claims (4)

(57) [Claims] 1. A method of manufacturing a laminated inductor in which a conductor pattern for a coil of about half turn is formed on a ceramic green sheet, and the conductor pattern for a coil is sequentially connected through a through hole of the ceramic green sheet to form a conductor pattern that circulates. A method of manufacturing a multilayer inductor, wherein a thickness of a conductor pattern of a portion facing a through hole of an adjacent ceramic green sheet before a laminating step is thicker than other portions of the conductor pattern. 2. Manufacturing a laminated inductor in which a conductor pattern for a coil of about half a turn is formed on a ceramic green sheet, and the conductor pattern for a coil is sequentially connected through a through hole of the ceramic green sheet to form a conductor pattern that circulates. In the method, a portion of the adjacent ceramic green sheet facing the through hole is formed before the lamination step
Method of manufacturing a multilayer inductor, characterized in that thicker than other portions of the conductive pattern by printing a further conductive material after printing the conductive pattern in the. 3. Manufacturing of a laminated inductor in which a conductor pattern for a coil of about half turn is formed on a ceramic green sheet, and the conductor pattern for a coil is sequentially connected through a through hole of the ceramic green sheet to form a conductor pattern that circulates. The method according to claim 1, wherein the thickness of the conductor pattern in a portion facing the through hole of the adjacent ceramic green sheet is made thicker than the other portion of the conductor pattern, and the portion is fitted in the through hole. Production method. 4. Manufacturing of a laminated inductor in which a conductor pattern for a coil of about half turn is formed on a ceramic green sheet, and the conductor pattern for a coil is sequentially connected through a through hole of the ceramic green sheet to form a conductor pattern that circulates. In the method, the thickness of the conductor pattern at a portion facing the through hole of the adjacent ceramic green sheet is made thicker than other portions of the conductor pattern, and the ceramic green sheet is aligned such that the thick portion faces the through hole. A method for manufacturing a laminated inductor, comprising: laminating, and crimping to fit the thick portion into a through hole.