JPH0365645B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an open magnetic path type laminate component and a method for manufacturing the same.

[Prior art and its problems]

Antenna coils and the like need to have an open magnetic path structure so that they can detect an electromagnetic field or cause electromagnetic coupling by interlinking with an external electromagnetic field. An inductor with an open magnetic path structure is manufactured by winding a conductor wire around a highly permeable ferrite rod, etc., but it is large and
There are problems such as the complicated manufacturing process. In contrast, a multilayer inductor using multilayer technology has recently become known. For example, a magnetic layer made of ferrite powder paste and a conductor pattern for forming a coil are laminated alternately, and the layers are laminated by high-temperature sintering. Let it be an inductor. In this type of laminated inductor, the conductor pattern is embedded in the sintered magnetic material, so the magnetic path is close to a closed magnetic path. Therefore, a non-magnetic layer such as alumina is provided around the magnetic layer, a conductive pattern is printed on the boundary between the magnetic layer and the non-magnetic layer to form a laminate, and this is sintered to create an open magnetic path structure. However, if you try to actually make a prototype of this, not only will the process become extremely complicated, but the magnetic layer and non-magnetic layer cannot be aligned precisely, and the magnetic layer and non-magnetic layer It was found that problems such as deformation, distortion, and cracking, as well as variations in quality, occur due to differences in the sintering shrinkage rates.

[Purpose of the invention]

An object of the present invention is to provide a laminated component including an open magnetic path type inductor with excellent characteristics. A further object of the present invention is to provide a method for manufacturing this type of laminated component with a simple production process.

[Summary of the structure and effects of the invention]

The laminated component of the present invention is an open magnetic path inductor itself (for example, an antenna coil) or a part that includes an open magnetic path inductor (for example, a transformer, LC
filters, intermediate frequency transformers, HICs, etc.), and these open-magnetic-path inductors consist of a sintered stack of alternating magnetic layers and a coil-forming conductor pattern extending along the outermost edge of each layer. The outer periphery of the conductor pattern is exposed to the outside from the magnetic material, and if necessary, the exposed conductor pattern is further protected with a resin layer. With this configuration, the inductor becomes a completely open magnetic path type, and can exhibit excellent effects in applications such as antennas and transformers.

The method of the present invention also comprises a plurality of raw magnetic layers;
In alternately stacking a plurality of raw conductor pieces for approximately half a turn to form a conductive pattern for forming a coil, the conductor pieces are formed on each magnetic layer so as to overlap perpendicularly on the same circular locus, and The ends of adjacent conductor pieces are overlapped and connected through the edge of the magnetic layer, and the outer periphery of the conductor piece is exposed to the outside by cutting along the circular trajectory before or after firing, and covered with resin if necessary. The present invention is a method for manufacturing an open magnetic path type inductor, or a laminated component including such an inductor. According to this method, an open magnetic path type inductor or a laminated component including such an inductor can be easily produced.

[Explanation of Examples]

The drawings illustrate an embodiment of the open magnetic path type laminated component of the present invention and its manufacturing method, and is an example in which the present invention is applied to a laminated inductor, and the product can be used as it is, for example, as an antenna coil.
However, this is merely an example, and it should be understood that the present invention can be applied to the various open magnetic path type laminated components mentioned above.

1 to 12 show a method for simultaneously manufacturing four open magnetic path type laminated inductors. It is clear that this method can be extended to the simultaneous manufacture of any number of pieces.

First, as shown in FIG. 1, a raw rectangular magnetic layer 1 is prepared which is made of a sheet or layer made of a paste of electrically insulating magnetic material, generally ferrite powder.
In this example, everything including the magnetic layer described below is formed by a printing method. As shown in Figure 2, Ag, Al, Cu, Ag−
Two linear conductor pieces 2, 2, 2, 2 are formed by printing from a paste of metal powder such as Pd or Pd. These conductor pieces extend vertically from the starting ends S, S of the magnetic layer 1 to the left side and center, and extend along the upper and lower sides. Next, as shown in FIG. 3, magnetic layers 3, 3 are printed so that only the ends of the conductor pieces 2, 2 are exposed, and then as shown in FIG.
4 is printed so as to overlap the conductor pieces 2, 2. The conductor pieces 4, 4 are symmetrical. Next, as shown in FIG. 5, the magnetic layers 5, 5 are printed so that only the ends of the conductor pieces 4, 4, 4, 4 are exposed, and then as shown in FIG. 6 to conductor piece 4, 4, 4, 4
Print overlapping the image. Similarly, magnetic layers 7, 7 as shown in FIG. 7, conductor pieces 8, 8 as shown in FIG.
8, 8 are formed one after another, and the central portion is used as the terminal ends F, F. Finally, as shown in FIG. 9, a magnetic layer 9 is printed on the entire surface to complete the lamination. The width of the laminate is J as shown in Figure 10.
The sintered body shown in FIG. 11 was obtained by cutting the sintered body at 10 places with a cutter and firing it at a high temperature in a firing furnace. The peripheral surface is ground if necessary, and external terminals 11, 11 made of conductive paste are baked so as to overlap the starting end S and the ending end F, as shown in FIG. 12, to complete the inductor.

The completed inductor has conductor pieces exposed around its periphery, and the overall pattern is a conductor pattern that spirals around in the vertical direction, clearly forming a coil. Therefore, this inductor is an open magnetic path type laminated inductor.

[Effect]

According to the method of the present invention, an open magnetic path type multilayer inductor can be easily provided by alternately laminating conductor pieces and magnetic layers of about half turns and cutting them along predetermined cutting lines.

Further, since the inductor of the present invention has a completely open magnetic path structure, it can be used in many elements such as antenna coils and exhibits excellent effects.

Note that the cutting described in connection with FIG. 10 can also be performed after the laminate is sintered. Further, by performing the steps shown in the above embodiment together with the step of laminating other elements such as capacitors, it is possible to construct an electronic component including a laminated inductor having an open magnetic path structure.

Furthermore, it is also possible to cover the entire or part of the exposed conductive pattern with resin to protect it.

[Brief explanation of drawings]

Figures 1 to 10 are plan views showing the method of the present invention, Figure 11 is a perspective view of the laminate after lamination, and Figure 12 is a perspective view of the completed open magnetic path multilayer inductor. It is. The main parts in the figure are as follows. 1, 3, 5, 7, 9: magnetic layer, 2, 4, 6,
8: Conductor piece, 11: External terminal, 10: Cutting wire.

Claims (1)

[Claims] 1. Consisting of a plurality of magnetic layers and a plurality of approximately half-turn conductor pieces formed along the outermost edge of each of these layers, connected between the magnetic layers and having the same orbit as a whole. A laminate consisting of a spiral coil-forming conductor pattern overlaid vertically, wherein the connection of the conductor piece for about half a turn is between the conductor piece for about an adjacent half turn inside the laminate. A closed magnetic path type laminated component including an open magnetic path type inductor in which the conductive pattern is formed through an edge of an intervening magnetic layer, and the outermost periphery of the conductor pattern is exposed from the magnetic layer. 2. A plurality of raw magnetic layers and a plurality of raw conductor pieces for approximately half a turn for forming a conductor pattern for forming a coil are inserted through the edge of the magnetic layer where the ends of the conductor pieces are interposed. The conductor pieces are alternately printed and laminated so as to be connected to adjacent conductor pieces, and at that time, the conductor pieces are vertically overlapped on the same circular trajectory, and the thus obtained laminated body is fired to form an integral sintered body, A method for manufacturing an open magnetic path type laminate component including an open magnetic path type inductor, the method comprising cutting the laminate so as to cut the outer peripheral portion of the conductor piece along the circular locus before or after the firing. .