JPH03278506A - Laminated coil component and manufacture thereof - Google Patents

Abstract

PURPOSE:To obtain a laminated coil component of small size but having a large inductance by winding at least a part out of a wound line at least one turn or more within a plane in the same height position of a sintered body. CONSTITUTION:In a laminated coil component equipped with a sintered body obtained by laminating and sintering a plurality of sheets 21, 23, 25 composed of insulating material or magnetic material and with a wound line arranged within the sintered body and constituted in the manner of advancing in the thickness direction of the sintered body, at least a part out of the wound line is wound at least one turn or more within a plane in the same height position of the sintered body. For example, a conductive paste is printed on the top surface of first sheet 21 formed by printing a ferrite paste for the purpose of forming a first line 22 with two turns of winding. Then, the ferrite paste is printed in the region of 1/2 of the sheet 21 and a second sheet 23 is laminated thereon. Subsequently, the conductive paste is printed and a second line 24 is formed thereon.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a laminated coil component used, for example, in an inductor or a transformer, and a method for manufacturing the same. The present invention relates to a laminated coil component and a manufacturing method thereof.

[Conventional technology]

Conventionally, chip-type coil parts have been commonly made by winding wires around a ferrite core.

However, the external shape is uneven, and chipping or cracking may occur during mounting. Furthermore, since it is not completely magnetically shielded, coupling with other coils may become a problem.

As a solution to the above-mentioned problems, a laminated coil component constructed by a method of alternately printing ferrite paste and conductive paste has been put into practical use. A conventional method of manufacturing this laminated coil component will be explained with reference to FIG.

First, as shown in FIG. 2(a), a sheet 1 is obtained by printing ferrite paste in a rectangular shape.

Next, 1/2 turn of conductive paste is printed on the sheet 1 to form a line 2 (FIG. 2(b)).

Furthermore, the sheet 3 is laminated on the sheet 2 by printing ferrite paste so as to partially hide the line 2 (FIG. 2(c)).

Then, the line 4 is connected to the sheet 2 and the sheet 3 by printing conductive paste so as to be connected to the ends of the line 2.
Print across the top. This line 4, like the line 2, is printed so that the number of turns is about 1/2 turn.

Furthermore, as shown in FIG. 2(e), the lines 2 and 1il
Ferrite paste is printed so as to cover the portion of AjiI4 on the line 2 side, and sheets 5 are laminated. Below, in order:
As shown in FIG. 2(f) to (+), the track 6, the seat 7
, the track 8 and the sheet 9 are printed and laminated.

Furthermore, as shown in FIG. 2(j), 1IA1 paste is printed on the line 10 so that it is connected to the end of the line 8.
form. This line 1 (l is the lower edge 9a of the sheet 9
is drawn out.

Finally, ferrite paste is printed on the upper surface of the laminate and the sheets 11 are laminated (FIG. 2(k)).

As described above, one end surface of the laminate (second rjJ(a
) and is wound 2.5 turns within the laminate, and the other end surface of the laminate (the edge 9a in FIG. 2(j) is exposed). A laminate is obtained that is drawn out on the side end surface). By firing this laminate, it is possible to obtain a laminated coil component in which a 2.5-turn winding line is formed inside and the ends of the winding line are drawn out on both end faces.

In the laminated coil component obtained as described above, since the winding line is constructed within a rectangular sintered body, chipping or cracking is unlikely to occur when used as a chip component. Since the winding line is buried in the fired body obtained by laminating and firing, the magnetic shield is perfect, and therefore there is no problem of compaction with other coil parts.

[Problem to be solved by the invention]

However, as is clear from Figure 2, in order to construct a winding line with 2.5 turns and draw it out on both end faces of the sintered body, ferrite paste and conductive paste had to be printed a total of 11 times. And between each printing process as described above, the previously printed ferrite paste or AT paste must be dried each time before the next printing. Therefore, the lamination process is very complicated. Become.

In addition, when trying to obtain a large inductance value, the number of times of printing is increased, which not only makes the printing and drying processes described above more complicated, but also increases the thickness of the element and increases the size of the parts. There were also problems.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a laminated coil component that is small and has a large inductance, and to provide a method for manufacturing such a laminated coil component through relatively simple steps.

[Means to solve the problem]

The laminated coil component of the present invention includes a sintered body obtained by laminating and firing a plurality of sheets made of an insulating or magnetic material, and a sintered body disposed within the sintered body and a thickness of the sintered body. In a laminated coil component comprising a winding path configured to advance in the direction, at least a part of the winding path IiA is wound at least one turn or more within a plane at the same height position of the sintered body. This is a laminated coil component characterized by the following.

Furthermore, the manufacturing method of the present invention repeats the steps of printing a sheet made of an insulator or magnetic material and printing a line made of conductive paste on the sheet, and then firing the laminated sheets. A method for manufacturing a laminated coil component in which a winding track based on tracks printed on a plurality of sheets is constructed in a sintered body, the first sheet having at least one turn or more of windings. a step of printing a first track, a step of printing a second sheet on the first sheet on which the first track is printed, so as to cover a part of the first track; printing a second line having a number of turns of one turn or less so as to be connected to an end of the first line on one sheet and with the other end located on the top surface of the second sheet; It is characterized by having the following.

[Effect]

In the laminated coil component of the present invention, a line portion is provided that is wound at least one turn in a plane at a height within the sintered body, so a large inductance value can be obtained without increasing the thickness. It is considered possible.

Further, the manufacturing method of the present invention includes a step of printing a first line having a number of turns of at least one turn on the first sheet. That is, a winding line portion of one turn or more is formed in a -degree printing process.

Therefore, the number of steps of printing the lines and laminating other sheets on the sheet on which the lines are printed is reduced.

That is, the present invention is configured such that a part of the winding line that advances in the thickness direction of the sintered body is wound at a given height position of the sintered body by one or more turns within the plane of the height position. By doing so, the present invention is characterized in that the number of printing steps for the conductive paste and sheet for obtaining a laminate is reduced and the inductance value is increased.

[Explanation of Examples]

FIG. 1 is a plan view for explaining a method of manufacturing a laminated coil component according to an embodiment of the present invention.

The laminated coil component obtained by this example is configured to have the same number of turns as the laminated coil component obtained by the conventional manufacturing method shown in FIG.

First, ferrite paste is printed in a rectangular shape to obtain the first sheet 21 as shown in FIG. Forming the first line 22 (Fig. 1 (
(see b)), this track 22 runs along one edge 2 of the sheet 21.
It has a shape that extends from the side 1a toward the other end edge 21b and is further wound toward the central region of the sheet 21.

Next, as shown in FIG. 1(C), a second sheet 23 is laminated on the sheet 21 by printing ferrite paste on a half area of the sheet 21. The laminated sheets 23 cover 1/2 of the area of the line 22.

Note that, as is clear from FIG. 1(c), the inner end 22a of the line 22 is not covered with the sheet 23.
That is, the size of the sheet 23 or the end portion 2 is adjusted so that the inner end portion 22a of the line 22 is not covered by the sheet 23.
It is necessary to select position 2a.

Next, as shown in FIG. 1(d), the second line 24 is formed by printing iXN paste. railroad track 2
4 is the inner end 22a of the track 22 on the first sheet 21
It is formed on the second sheet 23 so as to be connected to the edge 23a of the second sheet 23.

Finally, as shown in FIG. 1(e), the first sheet 21
The sheets 25 are laminated by printing ferrite paste in the same size as .

The laminate obtained as described above is pressed in the thickness direction and then fired, resulting in a sintered body 2 schematically shown in FIG.
6 is obtained. As schematically shown in this sintered body 26, a winding track 27 based on the above-described track 2224 is constructed.

As shown in FIG. 3, by providing external electrodes 28a and 28b on both end surfaces of the obtained sintered body 26, the sintered body 26 is
A ceramic coil component 29 having connection portions with the outside on both end faces of the ceramic coil component 6 can be obtained.

As is clear from the printing process with reference to FIG.
2 is printed to have a number of turns of 2 or more, so in the manufacturing method of this embodiment, a wound line having a number of turns of 2 or 5 is printed as in the conventional example shown in FIG. To configure it, the ferrite paste printing process is performed three times, and! ! It is only necessary to perform a total of five printing processes, including two paste printing processes. In other words, the 11 printing steps required in the conventional example can be reduced to 5 printing steps.

In addition, in the sintered body 26 shown in FIG. 3, a line portion with a number of turns of two or more turns is formed at a height position where the line 22 is formed in the thickness direction of the sintered body 26 (the (see line 22 in FIG. 1), therefore, it is possible to achieve an inductance value equivalent to that of the conventional example in FIG. 2 without increasing the thickness of the sintered body.

FIG. 4 is a plan view for explaining a method of manufacturing a ceramic coil component according to another embodiment of the present invention.

First, a first sheet 31 is obtained by printing ferrite paste in a rectangular shape. Next, as shown in FIG. 4(a), the sheet 3 is printed with conductive paste.
A first line 32 having a drawn out end 32a is formed on one end 31a side of the first line 32. The line 32 is spirally configured to have more than about two turns.

Next, ferrite paste is printed so as to cover 1/2 area of the first sheet 31, and the second sheet 33 is laminated. This second sheet 33 is attached to the inner end 32 of the track 32.
They are laminated so as not to cover b.

Next, as shown in FIG. 4(c), a conductive paste is printed so that it is connected to the inner end 32b of the line 32 and the end 34a is located on the second sheet 33. A second line 34 is formed.

This line 34 is shaped so that the number of turns is one turn or less.

Furthermore, as shown in FIG. 4(d), the first sheet 31
A third sheet 35 is laminated on the exposed area of the line 32 to cover the remaining exposed area of the line 32.

Next, as shown in FIG. 4(e), the end portion 34 of the line 34 is
Print the line 36 by printing conductive paste so that it is connected to a. This line 36 is spirally wound around 1.75 turns outward from the portion connected to the end 34a of the line 34, and is wound around the edge 33a of the sheet 33.
has been drawn out.

Finally, sheets 38 are laminated by printing ferrite paste in the same shape as the first sheet 31 (the fourth
Figure (f)).

The laminate obtained as described above is crimped in the thickness direction,
By firing after that, it is possible to obtain a sintered body in which a winding line extending in the thickness direction is formed. This winding line includes one end 32a of the line 32 and the line 36.
The end portions 36a of the sheet 31 and the sheet 33 are respectively drawn out to the exposed end surfaces. Therefore, on both end faces of the obtained sintered body,
By providing external electrodes, a chip-type coil component similar to the laminated coil component of the embodiment shown in FIG. 3 can be obtained.

In the manufacturing method of the embodiment shown in FIG. 4, a track 32 is spirally wound from the outside to the inside of the sheet 31, and is connected to a track 34 on the inside, and a track 36 connected to the track 34 is further connected to the track 34. It is spirally wound from the inside to the outside. Therefore, by utilizing the flat area of the sintered body for growth, the lines 32 and 3 can be formed at different height positions within the sintered body.
Since the line portion has two or more turns based on 6, it is said that it is possible to obtain a ceramic laminated coil component with a large inductance value by simply performing the sheet and line printing process a total of 8 times.

In the above-mentioned embodiment, the track was printed so that both ends of the wound track were drawn out to both end faces of the obtained sintered body.
Both ends of the line may be configured to be drawn out from the same side of the sintered body.

In addition, by repeating the printing process shown in Figure 4, that is, by repeating the structure in which the lines are spirally formed from the outside to the inside or from the inside to the outside within the plane area of the sheet in the thickness direction, a larger inductance value can be obtained. coil parts can be obtained.

Further, in each of the above embodiments, each sheet was constructed by printing ferrite paste, but the sheet may be constructed by printing an insulating material other than a magnetic material such as ferrite paste.

〔Effect of the invention〕

As described above, in the laminated coil component of the present invention, at least a part of the winding line has a winding number of at least one turn or more in a plane at the same height position of the sintered body 9. It is possible to increase the inductance value without increasing the body thickness, and it is also possible to reduce the thickness of a laminated coil component with the same inductance value. It becomes possible to provide laminated coil components of high value.

Furthermore, since the manufacturing method of the present invention includes the step of printing the first line with the number of windings of at least one turn or more on the first sheet, the number of windings of one turn or more is realized in one printing process. Therefore, it is possible to significantly reduce the number of printing steps for the conductive paste for configuring the sheet and the line compared to the conventional example. Therefore, it becomes possible to mass-produce the above-mentioned small-sized, high-inductance chip-type laminated coil components through a relatively simple process.

[Brief explanation of the drawing]

1(a) to 1(e) are respective plan views for explaining the manufacturing method of a laminated coil component according to an embodiment of the present invention, and FIG.
Figures (a) to (k) are plan views for explaining a conventional method for manufacturing a laminated coil component, and Figure 3 is a schematic cross-sectional view of a laminated coil component obtained according to an embodiment of the present invention. Figure 4C
a> to (f) are respective plan views for explaining a method of manufacturing a laminated coil component according to another embodiment of the present invention. In the figure, 21 is the first sheet, 22 is the first track,
23 is a second sheet, 24 is a second line, 26 is a sintered body, 27 is a wound line, 28a, 28b are external electrodes, 29 is a laminated coil component, 31 is a first sheet, 32 is a first , 33 is the second sheet, and 34 is the second line.

Claims (2)

[Claims] (1) A sintered body obtained by laminating and firing a plurality of sheets made of insulating or magnetic materials; A laminated coil component comprising a winding line configured as above, wherein at least a part of the winding line is wound at least one turn or more within a plane at the same height position of the sintered body. Laminated coil parts. (2) By repeating the process of printing a sheet made of an insulator or magnetic material and the process of printing a line made of conductive paste on the sheet, and firing the laminated sheets, multiple sheets are created in the sintered body. A method for manufacturing a laminated coil component in which a winding track is configured based on a track printed on a first sheet, the step of printing a first track having a number of windings of at least one turn or more on a first sheet; printing a second sheet on the first sheet on which the first track is printed so as to cover a part of the first track; one end is the end of the first track on the first sheet; and printing a second line having a number of windings of one turn or less so as to be connected to the top surface of the second sheet and with the other end positioned on the top surface of the second sheet. Production method.