JP6562158B2 - Multilayer toroidal coil and manufacturing method thereof - Google Patents

Description

  The present invention relates to a laminated toroidal coil formed in a laminated body and a manufacturing method thereof.

  Conventionally, a toroidal coil having a structure in which a plurality of interlayer connection conductors formed on a magnetic substrate are connected by conductor patterns formed on both surfaces of the magnetic substrate is known (Patent Document 1).

  Since the toroidal coil is a chip component, variation in characteristics is suppressed and the size can be reduced as compared with a toroidal coil having a structure in which a copper wire is wound around a toroidal core.

Japanese Patent Laid-Open No. 10-12446

  However, in the structure shown in Patent Document 1, an interlayer connection conductor that is a part of the toroidal coil is formed inside the magnetic substrate. That is, since the magnetic substance exists outside the winding range of the toroidal coil and the magnetic flux leaking outside the winding range of the toroidal coil increases, the magnetic field conversion efficiency of the current decreases.

  An object of the present invention is to provide a small laminated toroidal coil in which a decrease in current magnetic field conversion efficiency is suppressed.

(1) The laminated toroidal coil of the present invention is
A magnetic substrate having a first main surface and a second main surface;
A non-magnetic substrate;
A laminate comprising a laminate of the magnetic substrate and the non-magnetic substrate and having a third principal surface and a fourth principal surface;
An external electrode formed on the non-magnetic substrate, disposed on the third main surface or the fourth main surface;
Coils,
With
The laminate is provided with a through-hole penetrating the third main surface and the fourth main surface,
The coil is
A first conductor pattern formed on the first main surface of the magnetic substrate;
A second conductor pattern formed on the second main surface of the magnetic substrate;
An outer peripheral end face conductor formed on the outer peripheral end face of the magnetic substrate;
An inner peripheral end face conductor formed on the inner peripheral end face on the through hole side of the magnetic substrate;
Are connected to each other.

  With this configuration, generation of magnetic flux that leaks outside the coil winding range is suppressed, and as a result, a decrease in the magnetic field conversion efficiency of the coil current is suppressed. In addition, since a laminated body formed by laminating a magnetic substrate and a nonmagnetic substrate is provided, a conductor can be freely routed using the nonmagnetic substrate while ensuring the closed magnetic circuit characteristics of the toroidal coil. It becomes easy to configure.

(2) In the above (1), the nonmagnetic substrate includes a first nonmagnetic substrate disposed on the third principal surface, a second nonmagnetic substrate disposed on the fourth principal surface, It is preferable to have. With this configuration, the degree of freedom of conductor routing using the non-magnetic substrate is further increased. Also, with this configuration, cracking and deformation of the laminate due to the difference in shrinkage rate during firing between the magnetic substrate and the non-magnetic substrate are suppressed.

(3) In said (1) or (2), it is preferable that the outer edge shape of the said laminated body is a rectangle seeing from the lamination direction of the said magnetic body board | substrate and the said nonmagnetic board | substrate. With this configuration, it is possible to increase the degree of freedom of the shape and arrangement of the external electrodes as compared to the case where the outer edge shape of the laminated body viewed from the lamination direction of the magnetic substrate and the nonmagnetic substrate is circular or the like.

(4) In the above (3), a plurality of the outer peripheral end surface conductors are formed on the outer peripheral end surface, and the outer peripheral end surface is formed on the outer peripheral end surface of each side of the multilayer body as viewed from the stacking direction. It is preferable that the number of conductors is equal. With this configuration, the bias of the magnetic field generated in the coil can be suppressed.

(5) In any one of the above (1) to (4), the external electrode is the nonmagnetic substrate on which the external electrode is formed when viewed from the stacking direction of the magnetic substrate and the nonmagnetic substrate. It is preferable that the first conductor pattern or the second conductor pattern is formed at the interface between the first conductor pattern and the second magnetic substrate. With this configuration, since the external electrode and the conductor pattern adjacent to the external electrode do not face each other, the stray capacitance generated between the conductor pattern (a part of the coil) and the external electrode can be reduced.

(6) In any one of the above (1) to (5), the laminated body is provided with a plurality of the through holes, and the coil is viewed from the lamination direction of the magnetic substrate and the nonmagnetic substrate. It is preferable that the windings are wound so that the directions of the magnetic fields formed around the adjacent through holes are opposite to each other. With this configuration, among the magnetic fluxes generated around the adjacent through holes, the directions of the magnetic fluxes passing through the magnetic substrate between the adjacent through holes are the same. Therefore, since the magnetic flux generated around one through hole is suppressed from being canceled out by the magnetic flux generated around the other through hole, even when a plurality of through holes are provided, the lamination that suppresses the decrease in inductance value is suppressed. A toroidal coil can be realized.

(7) In any one of the above (1) to (6), a plurality of the inner peripheral side end surface conductors are formed on the inner peripheral side end surface, and the laminated body includes the magnetic substrate and the nonmagnetic substrate. It is preferable that a convex portion and a concave portion are formed in the through hole viewed from the stacking direction, and the plurality of inner peripheral side end surface conductors are formed on the inner peripheral side end surfaces of the convex portion and the concave portion. With this configuration, it is possible to increase the gap between the adjacent inner peripheral side end surface conductors as compared to the case where the inner peripheral side end surface conductor is formed on the inner peripheral side end surface where no recess is formed. Therefore, with this configuration, even when the number of turns for winding the inner peripheral end face is the same, there is a low possibility that a short circuit will occur between adjacent inner peripheral end face conductors.

(8) In any one of the above (1) to (7), the coil is preferably made of a conductor mainly composed of Ag. With this configuration, the Rdc (DC resistance) of the coil can be reduced as compared with the case where the coil is made of a conductor whose main component is Cu.

(9) The method for producing the laminated toroidal coil of the present invention includes:
Forming a magnetic substrate having a first main surface and a second main surface;
Forming a non-magnetic substrate; a non-magnetic substrate forming step;
A conductor forming step of forming a first conductor pattern on the first main surface and forming a second conductor pattern on the second main surface after the magnetic substrate forming step;
After the conductor forming step and the non-magnetic substrate forming step, the magnetic substrate and the non-magnetic substrate are laminated so that the non-magnetic substrate is disposed on the third main surface to obtain a laminate. And laminating process,
A through-hole forming step of forming a through-hole penetrating in the stacking direction of the magnetic substrate and the non-magnetic substrate after the stacking step;
A separation step of separating the laminate into pieces after the lamination step;
A heating step of heating the laminate after the separation step;
It is characterized by providing.

  With this manufacturing method, it is possible to easily manufacture a small-sized laminated toroidal coil that suppresses a decrease in current magnetic field conversion efficiency.

(10) In the above (9), the conductor forming step includes a step of forming an interlayer connection conductor connecting the first conductor pattern and the second conductor pattern on the magnetic substrate, and the separating step includes The step of separating the laminated body together with the interlayer connection conductors may be included.

  ADVANTAGE OF THE INVENTION According to this invention, the small multilayer toroidal coil which suppressed the fall of the magnetic field conversion efficiency of an electric current is realizable.

FIG. 1 is a perspective view of a laminated toroidal coil 101 according to the first embodiment. 2A is a plan view of the laminated toroidal coil 101, FIG. 2B is a cross-sectional view taken along line AA in FIG. 2A, and FIG. 2C is a bottom view of the laminated toroidal coil 101. is there. FIG. 3 is a cross-sectional view illustrating the manufacturing process of the laminated toroidal coil 101 in order. 4A is a plan view of the laminated toroidal coil 102 according to the second embodiment, FIG. 4B is a front view of the laminated toroidal coil 102, and FIG. 4C is a laminated toroidal coil 102. FIG. FIG. 5 is a plan view of the laminated toroidal coil 102 showing the relationship between the current flowing through the coil and the magnetic field formed on the magnetic substrate 11. FIG. 6A is a plan view of the laminated toroidal coil 103 according to the third embodiment, and FIG. 6B is a front view of the laminated toroidal coil 103. FIG. 7 is an enlarged plan view of the DP portion in FIG.

  Hereinafter, several specific examples will be given with reference to the drawings to show a plurality of modes for carrying out the present invention. In each figure, the same reference numerals are assigned to the same portions. In consideration of ease of explanation or understanding of the main points, the embodiments are shown separately for convenience, but the components shown in different embodiments can be partially replaced or combined. In the second and subsequent embodiments, description of matters common to the first embodiment is omitted, and only different points will be described. In particular, the same operation effect by the same configuration will not be sequentially described for each embodiment.

<< First Embodiment >>
FIG. 1 is a perspective view of a laminated toroidal coil 101 according to the first embodiment. 2A is a plan view of the laminated toroidal coil 101, FIG. 2B is a cross-sectional view taken along line AA in FIG. 2A, and FIG. 2C is a bottom view of the laminated toroidal coil 101. is there. In FIG. 2A, the second nonmagnetic substrate 13 is not shown.

  As shown in FIG. 2B and the like, the laminated toroidal coil 101 includes a laminated body 1, a coil CL (described in detail later), and external electrodes P1 and P2.

  The laminated body 1 is a rectangular parallelepiped insulator that is formed by laminating a magnetic substrate 11, a first nonmagnetic substrate 12, and a second nonmagnetic substrate 13, and has a third main surface S3 and a fourth main surface S4. is there. As shown in FIGS. 2A and 2C, the outer edge shape of the multilayer body 1 is the stacking direction of the magnetic substrate 11, the first nonmagnetic substrate 12, and the second nonmagnetic substrate 13 (Z-axis). It is a rectangle when viewed from (direction). Further, the laminate 1 is provided with a through hole CP that penetrates the third main surface S3 and the fourth main surface S4 and has a circular shape when viewed from the Z-axis direction. The laminated body 1 is a dielectric ceramic such as a low temperature co-fired ceramic (LTCC).

  As shown in FIG. 2B and the like, the magnetic substrate 11 is an insulating flat plate having a first main surface S1 and a second main surface S2. The first nonmagnetic substrate 12 is an insulating flat plate that is stacked on the first main surface S1 side of the magnetic substrate 11 and is disposed on the third main surface S3 of the stacked body 1. The second nonmagnetic substrate 13 is an insulating flat plate that is stacked on the second main surface S2 side of the magnetic substrate 11 and is disposed on the fourth main surface S4 of the stacked body 1. The magnetic substrate 11 is, for example, a magnetic ferrite sheet, and the first nonmagnetic substrate 12 and the second nonmagnetic substrate 13 are, for example, nonmagnetic ferrite sheets.

  As shown in FIG. 2C, eleven first conductor patterns 21 are formed on the first main surface S1 of the magnetic substrate 11. On the second main surface S2 of the magnetic substrate 11, twelve second conductor patterns 22 are formed as shown in FIG. The first conductor pattern 21 and the second conductor pattern 22 are viewed from the Z-axis direction through the through hole CP to the outer peripheral side end surface of the magnetic substrate 11 (the magnetic substrate 11 shown in FIGS. 2A and 2C). It is a linear conductor pattern extended toward each side). As shown in FIG. 2B, the first conductor pattern 21 is formed at the interface between the first non-magnetic substrate 12 and the magnetic substrate 11. The second conductor pattern 22 is formed at the interface between the second nonmagnetic substrate 13 and the magnetic substrate 11. The first conductor pattern 21 and the second conductor pattern 22 are conductor patterns mainly composed of Ag, for example.

  Further, twelve outer peripheral end surface conductors 41 are formed on the outer peripheral end surface of the magnetic substrate 11. Twelve inner peripheral end surface conductors 42 are formed on the inner peripheral end surface on the through hole CP side of the magnetic substrate 11. The outer peripheral side end surface conductor 41 and the inner peripheral side end surface conductor 42 are conductors that extend in the Z-axis direction and are partially exposed from the magnetic substrate 11, and are composed of a plurality of interconnected interlayer connection conductors. The outer peripheral side end surface conductor 41 and the inner peripheral side end surface conductor 42 are conductors mainly composed of Ag, for example.

  As shown in FIG. 2A, the first end of the first conductor pattern 21 is connected to the outer peripheral end surface conductor 41, and the second end of the first conductor pattern 21 is connected to the inner peripheral end surface conductor 42. As shown in FIG. 2C, the first end of the second conductor pattern 22 is connected to the outer peripheral end face conductor 41, and the second end of the second conductor pattern 22 is connected to the inner peripheral end face conductor 42. In this way, the 11 first conductor patterns 21, the 12 second conductor patterns 22, the outer peripheral end face conductors 41 of the 12 and the inner peripheral end face conductor 42 of the 12 are connected, and the first main surface S 1 of the magnetic substrate 11 is connected. A coil CL is formed to wind the second main surface S2, the inner peripheral side end surface, and the outer peripheral side end surface.

  The first end and the second end of the coil CL are connected to the external electrodes P1 and P2, respectively. Specifically, as shown in FIG. 2C, the external electrode P <b> 1 is connected to the first end of the coil CL via a lead conductor 51 connected to the outer peripheral end face conductor 41. In addition, the external electrode P2 is connected to the second end of the coil CL through a lead conductor 51 connected to the inner peripheral end face conductor 42.

  The external electrodes P1, P2 are conductor patterns having a rectangular planar shape formed on the surface of the first nonmagnetic substrate 12 (the third main surface S3 of the multilayer body 1). The external electrodes P1 and P2 are arranged at positions that do not overlap the first conductor pattern 21 or the second conductor pattern 22 (a part of the coil CL) when viewed from the Z-axis direction. The lead conductors 51 and 52 are linear conductor patterns formed on the surface of the first nonmagnetic substrate 12 (the third main surface S3 of the multilayer body 1).

  As shown in FIGS. 2A and 2C, the number of outer peripheral end surface conductors 41 formed on the outer peripheral end surface of each side of the multilayer body 1 as viewed from the Z-axis direction is the same (3 One). That is, the number of turns of the coil CL wound from the inner peripheral end surface to the outer peripheral end surface of each side of the multilayer body 1 is equal.

  The laminated toroidal coil 101 according to this embodiment has the following effects.

(A) In the laminated toroidal coil 101 according to the present embodiment, the first conductor pattern 21 and the second conductor pattern 22 are formed on the main surface of the magnetic substrate 11, and a part of the outer peripheral end surface conductor 41 and the inner peripheral end surface A part of the conductor 42 is exposed from the magnetic substrate 11. That is, in this embodiment, since there is no magnetic body outside the coil winding range, the generation of magnetic flux that leaks outside the coil winding range is suppressed, and as a result, the reduction in the magnetic field conversion efficiency of the coil current is suppressed. Is done.

  In the present embodiment, the configuration in which the plurality of outer peripheral side end surface conductors 41 and the plurality of inner peripheral side end surface conductors 42 are all exposed from the magnetic substrate 11 has been described, but the present invention is not limited to this. If at least one of the plurality of outer peripheral end face conductors 41 or the plurality of inner peripheral end face conductors 42 is exposed from the magnetic substrate 11, the above-described functions and effects are exhibited.

(B) Since the multilayer body 1 according to the present embodiment is formed by laminating the magnetic substrate 11, the first nonmagnetic substrate 12, and the second nonmagnetic substrate 13, while ensuring the closed magnetic circuit characteristics of the toroidal coil. The conductor can be freely routed using the non-magnetic substrate, and the circuit configuration becomes easy.

  In the present embodiment, the first nonmagnetic substrate 12 and the second nonmagnetic substrate 13 are laminated on the first main surface S1 and the second main surface S2 of the magnetic substrate 11, respectively. That is, since the magnetic substrate 11 is sandwiched between the first non-magnetic substrate 12 and the second non-magnetic substrate 13, the conductor using the first non-magnetic substrate 12 and the second non-magnetic substrate 13 is used. The degree of freedom of routing is further increased. Further, with this configuration, cracking and deformation of the laminate 1 due to a difference in shrinkage rate during firing between the magnetic substrate and the non-magnetic substrate are suppressed.

(C) In this embodiment, since the coil CL is formed in the laminated body 1, a small (especially low-profile) toroidal coil can be realized as compared with a toroidal coil having a structure in which a copper wire is wound around a core.

(D) The laminated toroidal coil 101 according to the present embodiment has a configuration in which the coil CL is wound around the magnetic substrate 11. Therefore, a laminated toroidal coil having a predetermined inductance value can be obtained without increasing the size. Also, with this configuration, since a predetermined inductance can be obtained with a small number of turns, the coil line length can be shortened and the Rdc (DC resistance) of the coil can be reduced as compared with the case where the magnetic substrate 11 is not provided.

(E) In this embodiment, the outer edge shape of the laminated body 1 is a rectangle when viewed from the Z-axis direction. Therefore, compared with the case where the outer edge shape of the laminated body 1 seen from the Z-axis direction is circular or the like, the degree of freedom of the shape and arrangement of the external electrodes P1 and P2 can be increased.

(F) In the present embodiment, the external electrodes P1 and P2 are disposed at positions that do not overlap the first conductor pattern 21 (a part of the coil CL) when viewed from the Z-axis direction. With this configuration, since the external electrodes P1, P2 and the first conductor pattern 21 do not face each other, stray capacitance generated between the first conductor pattern 21 (a part of the coil CL) and the external electrodes P1, P2. Can be reduced.

(G) In this embodiment, the number of outer peripheral side end surface conductors formed on the outer peripheral side end surface of each side of the multilayer body 1 as viewed from the Z-axis direction is equal (three). That is, the number of turns of the coil CL wound from the inner peripheral end surface to the outer peripheral end surface of each side of the multilayer body 1 is equal. Therefore, the bias of the magnetic field generated in the coil can be suppressed.

(H) In the present embodiment, the coil CL is composed of conductors mainly composed of Ag (the first conductor pattern 21, the second conductor pattern 22, the outer peripheral end surface conductor 41, and the inner peripheral end surface conductor 42). Therefore, the Rdc (DC resistance) of the coil CL can be reduced by about 5% compared to the case where the coil CL is made of a conductor whose main component is Cu.

  The laminated toroidal coil 101 according to the present embodiment is manufactured, for example, by the following process. FIG. 3 is a cross-sectional view illustrating the manufacturing process of the laminated toroidal coil 101 in order.

  First, as shown to (1) in FIG. 3, the magnetic substrate 11A before baking which has 1st main surface S1 and 2nd main surface S2 is formed. Further, the first nonmagnetic substrate 12A and the second nonmagnetic substrate 13A before firing are formed. The magnetic substrate 11A is a green sheet such as magnetic ferrite such as low temperature co-fired ceramics (LTCC). The first nonmagnetic substrate 12A and the second nonmagnetic substrate 13A are green sheets such as nonmagnetic ferrite such as low temperature co-fired ceramics (LTCC).

  This step of forming the magnetic substrate 11A having the first main surface S1 and the second main surface S2 is an example of the “magnetic substrate forming step” in the present invention. Further, this step of forming the first nonmagnetic substrate 12A and the second nonmagnetic substrate 13A is an example of the “nonmagnetic substrate forming step” in the present invention.

  Next, after forming the interlayer connection conductors 31A and 32A on the magnetic substrate 11A, the first conductor pattern 21A is formed on the first main surface S1 of the magnetic substrate 11A, and the second conductor pattern 22A is formed on the second main surface S2. Form. The first conductor pattern 21A and the second conductor pattern 22A are connected by interlayer connection conductors 31A and 32A. The interlayer connection conductors 31A and 32A are composed of a plurality of interconnected interlayer connection conductors. The interlayer connection conductors 31A and 32A are, for example, via conductors formed by connecting a plurality of through holes penetrating the magnetic substrate 11A in the thickness direction (Z-axis direction) and then filling with a conductive paste. The first conductor pattern 21A and the second conductor pattern 22A are conductor patterns formed by printing Ag paste, for example.

  After the “magnetic substrate forming step”, these steps of forming the first conductor pattern 21A on the first main surface S1 and forming the second conductor pattern 22A on the second main surface S2 are the “conductor” in the present invention. It is an example of a “forming process”.

  In addition, interlayer connection conductors (not shown) and external electrodes P1A and P2A are formed on the first nonmagnetic substrate 12A. The external electrodes P1A and P2A are conductor patterns formed by printing Ag paste, for example.

  Next, as shown in (2) of FIG. 3, the magnetic substrate 11A, the first nonmagnetic substrate 12A, and the second nonmagnetic substrate 13A are laminated to obtain a laminated body 1A. Specifically, the laminated body 1A is obtained by laminating the first nonmagnetic substrate 12A, the magnetic substrate 11A, and the second nonmagnetic substrate 13A in this order. At this time, the first non-magnetic substrate 12A is disposed on the third main surface S3 side of the multilayer body 1A, and the second non-magnetic substrate 13A is disposed on the fourth main surface S4 side of the multilayer body 1A.

  After the “conductor forming step” and the “nonmagnetic substrate forming step”, the magnetic substrate 11A and the first nonmagnetic substrate 12A are arranged so that the first nonmagnetic substrate 12A is disposed on the third main surface S3. This step of laminating the second nonmagnetic substrate 13A to obtain the laminate 1A is an example of the “lamination step” in the present invention.

  Next, as shown in (3) of FIG. 3, a through hole CP penetrating in the stacking direction (Z-axis direction) of the magnetic substrate 11A, the first nonmagnetic substrate 12A, and the second nonmagnetic substrate 13A is formed. Form. Specifically, a through hole reaching a through line (see the through line DL1 shown in (2) in FIG. 3) is drilled so as to cross the interlayer connecting conductor 32A in which a plurality of interlayer connecting conductors are connected. Etc. to form the laminated body 1A. As a result, the inner peripheral end face conductor 42A is formed, and the inner peripheral end face conductor 42A is exposed in the through hole CP.

  This step of forming the through hole CP penetrating in the stacking direction of the magnetic substrate 11A, the first nonmagnetic substrate 12A and the second nonmagnetic substrate 13A in the stacked body 1A after the “stacking step” is performed according to the present invention. Is an example of a “through-hole forming step”.

  Further, the laminated body 1A is separated into individual pieces (laminated body 1B). Specifically, a set of cutting lines (see cutting line DL2 shown in (2) in FIG. 3) for each interlayer connection conductor 31A so as to cross the interlayer connection conductor 31A connected with a plurality of interlayer connection conductors. The laminated body 1A in a substrate state is cut and separated by a dicer cut or the like. As a result, the outer peripheral end face conductor 31B is formed, and the outer peripheral end face conductor 31B is exposed on the cut surface.

  This step of separating the laminated body 1A into individual pieces after the “lamination step” is an example of the “separation step” in the present invention. The “separation step” may be performed before the “penetration term formation step”.

  Next, the laminated body 1B is heated and baked at a temperature of 800 ° C. or higher to obtain a laminated toroidal coil 101 shown in (4) in FIG.

  This step of heating the laminate 1B after the “separation step” is an example of the “heating step” in the present invention.

  By this manufacturing method, the small laminated toroidal coil 101 in which the decrease in the magnetic field conversion efficiency of the current is suppressed can be easily manufactured.

<< Second Embodiment >>
In the second embodiment, an example of a laminated toroidal coil provided with a plurality of through holes is shown.

  4A is a plan view of the laminated toroidal coil 102 according to the second embodiment, FIG. 4B is a front view of the laminated toroidal coil 102, and FIG. 4C is a laminated toroidal coil 102. FIG.

  As shown in FIG. 4B and the like, the laminated toroidal coil 102 includes a laminated body 1C, a coil, and external electrodes P1 and P2.

  The laminated toroidal coil 102 is different from the laminated toroidal coil 101 according to the first embodiment in that the laminated toroidal coil 102 includes a laminated body 1C provided with two through holes CP1 and CP2. Other configurations are substantially the same as those of the laminated toroidal coil 101. Hereinafter, a different part from the laminated toroidal coil 101 will be described.

  The laminated body 1C is formed by laminating a magnetic substrate 11 and a first nonmagnetic substrate 12. The laminated body 1C is provided with two through holes CP1 and CP2 that pass through the third main surface S3 and the fourth main surface S4 and have a circular shape when viewed from the Z-axis direction. The through holes CP1 and CP2 are disposed adjacent to each other in the X-axis direction when viewed from the Z-axis direction. When the external electrode P1 is a starting point, the coil is wound in order from the external electrode P1 to the left side, the lower side, the right side, and the upper side of the through hole CP1, and then the upper side, the right side of the through hole CP2 through the lead conductor, It is wound in order from the lower side and connected to the external electrode P2.

  Next, the relationship between the current flowing through the laminated toroidal coil 102 and the magnetic field formed on the magnetic substrate 11 will be described. FIG. 5 is a plan view of the laminated toroidal coil 102 showing the relationship between the current flowing through the coil and the magnetic field formed on the magnetic substrate 11.

  The coil according to the present embodiment is wound so that the directions of the magnetic fields formed around the adjacent through holes CP1 and CP2 are opposite to each other as viewed from the Z-axis direction (the magnetic fluxes φ1 and φ1 in FIG. 5). (See φ2). At this time, a current flows through the second conductor pattern 22 (a part of the coil) in the direction of the broken arrow shown in FIG. The method of winding the coil is not limited to the winding method shown in the present embodiment as long as the directions of the magnetic fields formed around the through holes CP1 and CP2 are opposite to each other.

  According to the laminated toroidal coil 102 according to the present embodiment, the following effects can be obtained in addition to the effects described in the first embodiment.

(I) The coil according to the present embodiment is wound so that the directions of the magnetic fields formed around the adjacent through holes CP1 and CP2 are opposite to each other when viewed from the Z-axis direction. With this configuration, among the magnetic fluxes generated around the adjacent through holes CP1 and CP2, the direction of the magnetic flux passing through the magnetic substrate 11 between the adjacent through holes CP1 and CP2 is the same (the magnetic flux in FIG. 5). (See φ1 and φ2). Therefore, the magnetic flux generated around one through hole CP1 is suppressed from being canceled by the magnetic flux generated around the other through hole CP2. Therefore, with this configuration, even when a plurality of through holes are provided, a laminated toroidal coil that suppresses a decrease in inductance value can be realized.

(J) The laminated body 1C according to the present embodiment has a configuration in which the magnetic substrate 11 and the first nonmagnetic substrate 12 are laminated. Therefore, it is possible to realize a toroidal coil that is smaller (lower in profile) than a configuration in which a magnetic substrate is sandwiched between two nonmagnetic substrates (for example, the laminated body 1 of the first embodiment). However, in terms of increasing the degree of freedom of conductor routing using the nonmagnetic substrate, a configuration in which the magnetic substrate is sandwiched between the nonmagnetic substrates as in the multilayer body 1 of the first embodiment is preferable.

  In addition, in this embodiment, although shown about the laminated body 1C provided with two through-holes, the number of through-holes may be two or more. Even in this case, the coil is preferably wound so that the directions of the magnetic fields formed around the adjacent through holes are opposite to each other when viewed from the Z-axis direction.

<< Third Embodiment >>
In 3rd Embodiment, the example of the laminated toroidal coil from which the shape of a through-hole differs is shown.

  FIG. 6A is a plan view of the laminated toroidal coil 103 according to the third embodiment, and FIG. 6B is a front view of the laminated toroidal coil 103. FIG. 7 is an enlarged plan view of the DP portion in FIG. In FIG. 6, the second nonmagnetic substrate 13 is not shown.

  The laminated toroidal coil 103 includes a laminated body 1D, a coil, and external electrodes (not shown).

  The laminated toroidal coil 103 is different from the laminated toroidal coil 101 according to the first embodiment in that it includes a laminated body 1D provided with a through hole CP3. Other configurations are substantially the same as those of the laminated toroidal coil 101. Hereinafter, a different part from the laminated toroidal coil 101 will be described.

  As shown in FIG. 6B, the laminated body 1D is formed by laminating a magnetic substrate 11, a first nonmagnetic substrate 12, and a second nonmagnetic substrate 13. The stacked body 1D is provided with a through hole CP3 penetrating the third main surface S3 and the fourth main surface S4. The through hole CP3 has a substantially rectangular shape when viewed from the Z-axis direction, and has a shape that is pulled out into a substantially rectangular shape by connecting a plurality of circular through holes. Therefore, as shown in FIG. 7, a plurality of convex portions PP1 and a plurality of concave portions GP1 are formed in the through hole CP3 viewed from the Z-axis direction. As shown in FIG. 7, the concave portion GP1 has a shape in which the inner peripheral side end surface between the adjacent convex portions PP1 is cut into a hemispherical shape with a radius R toward the −X direction when viewed from the Z-axis direction. is there.

  24 inner peripheral end face conductors 42a and 28 inner peripheral end face conductors 42b are formed on the inner peripheral end face of the magnetic substrate 11 on the through hole CP3 side. The inner peripheral end face conductor 42a is a conductor formed on the inner peripheral end face of the convex portion PP1, and the inner peripheral end face conductor 42b is a conductor formed on the inner peripheral end face of the concave portion GP1.

  Further, 51 (or 52) first conductor patterns (not shown) are formed on the first main surface S1 of the magnetic substrate 11. 52 second conductor patterns 22 are formed on the second main surface S2 of the magnetic substrate 11. 52 outer peripheral end surface conductors 41 are formed on the outer peripheral end surface of the magnetic substrate 11.

  These 51 (or 52) first conductor patterns, 52 second conductor patterns 22, 52 outer peripheral side end surface conductors 41, 24 inner peripheral side end surface conductors 42a and 28 inner peripheral side end surface conductors 42b are connected, and magnetic The coil which winds 1st main surface S1, 2nd main surface S2, the inner peripheral side end surface, and the outer peripheral side end surface of the body substrate 11 is formed.

In this embodiment, the inner peripheral side end surface conductors 42a and 42b are formed on the inner peripheral side end surfaces of the convex portion PP1 and the concave portion GP1 of the through hole CP3 as viewed from the Z-axis direction. Therefore, compared with the case where the inner peripheral side end surface conductor is formed on the inner peripheral side end surface where the recess GP1 is not formed, the gap between the adjacent inner peripheral side end surface conductors 42a and 42b can be increased (for example, Y in FIG. 7). When a plurality of inner peripheral end face conductors are arranged in the axial direction, the gap between adjacent inner peripheral end face conductors is R, but the gap between the inner peripheral end face conductors 42a and 42b according to the present embodiment is 2 ^{1. / 2} R). Therefore, with this configuration, even when the number of turns for winding the inner peripheral end face is the same, there is a low possibility that a short circuit will occur between adjacent inner peripheral end face conductors.

  As shown in the present embodiment, the shape of the through hole provided in the stacked body is not limited to a circle as viewed from the Z-axis direction. The shape of the through hole viewed from the Z-axis direction can be changed as appropriate within the range where the functions and effects of the present invention are exhibited, and may be, for example, a rectangle, an ellipse, a polygon, or the like.

  In the present embodiment, the configuration in which one inner peripheral end surface conductor 42b is formed on the inner peripheral end surface of one concave portion GP1 is not limited to this. A plurality of inner peripheral end surface conductors may be formed on the inner peripheral end surface of one recess GP1.

  In the present embodiment, the concave portion GP1 viewed from the Z-axis direction has a hemispherical shape with the inner peripheral side end face notched, but the present invention is not limited to this configuration. The shape of the recess GP1 viewed from the Z-axis direction can be changed as appropriate within the range where the functions and effects of the present invention are exhibited. For example, the shape may be a shape in which the inner peripheral side end face is cut out in a rectangular shape.

<< Other Embodiments >>
In each of the embodiments described above, an example in which the outer edge shape of the stacked body is a rectangle when viewed from the Z-axis direction is shown, but the configuration is not limited to this. The outer edge shape of the laminate can be appropriately changed within the range where the effects and effects of the present invention are exhibited, and may be, for example, a polygon, a circle, an ellipse, or the like.

  In the first embodiment described above, the laminated body 1 formed by laminating the magnetic substrate 11, the first nonmagnetic substrate 12, and the second nonmagnetic substrate 13 has been described. However, the present invention is limited to this configuration. Is not to be done. The number of stacked layers is not limited to 2 or 3, and may be 4 or more. That is, the number of the magnetic substrate 11, the first nonmagnetic substrate 12, and the second nonmagnetic substrate 13 may be plural.

  In each of the embodiments described above, the outer peripheral end face conductor 41 and the inner peripheral end face conductor 42 are formed by dividing (cutting) a plurality of interconnected interlayer connection conductors, and the outer peripheral end face conductor 41 and the inner peripheral side are formed. Although an example in which a part of the end surface conductor 42 is embedded in the magnetic substrate 11 has been shown, the present invention is not limited to this configuration. The outer peripheral end surface conductor 41 may be formed by dividing (cutting) one interlayer connection conductor. Moreover, the outer peripheral side end surface conductor 41 may be a conductor pattern formed on the outer peripheral side end surface. The same applies to the inner peripheral side end face conductor 42.

  In addition, the shape, the number of windings, and the like of the coil CL in the present invention are not limited to the configurations of the embodiments described above, and can be appropriately changed within the scope of the operations and effects of the present invention.

  Finally, the description of the above embodiment is illustrative in all respects and not restrictive. Modifications and changes can be made as appropriate by those skilled in the art. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention includes modifications from the embodiments within the scope equivalent to the claims.

CP, CP1, CP2, CP3 ... through hole CL ... coil DL1 ... through line DL2 ... cutting line PP1 ... convex portion GP1 ... concave portion P1, P1A, P2, P1A ... external electrode S1 ... first main surface S2 of the magnetic substrate ... Second main surface S3 of magnetic substrate ... Third main surface S4 of laminated body ... Fourth main surface 1, 1A, 1B, 1C, 1D of laminated body ... Laminated bodies 11, 11A ... Magnetic substrates 12, 12A ... No. 1 nonmagnetic substrate 13, 13A ... second nonmagnetic substrate 21, 21A ... first conductor pattern 22, 22A ... second conductor pattern 31A, 32A ... interlayer connection conductor 41, 41A ... outer peripheral end face conductors 42, 42a, 42b, 42A ... inner peripheral side end conductors 51, 52 ... routing conductors 101, 102, 103 ... laminated toroidal coil

Claims (9)

A magnetic substrate having a first main surface and a second main surface;
A non-magnetic substrate,
A non-magnetic substrate laminated on at least the first main surface of the magnetic substrate, and a laminate having a third main surface and a fourth main surface;
An external electrode formed on the non-magnetic substrate, disposed on the third main surface;
Coils,
With
The laminate is provided with a through-hole penetrating from the third main surface to the fourth main surface,
The coil is
A first conductor pattern formed on the first main surface of the magnetic substrate;
A second conductor pattern formed on the second main surface of the magnetic substrate;
An outer peripheral end face conductor formed on the outer peripheral end face of the magnetic substrate;
An inner peripheral end face conductor formed on the inner peripheral end face on the through hole side of the magnetic substrate;
Ri but the name is connected,
The laminate is provided with a plurality of the through holes,
The coil is
As viewed from the stacking direction of the magnetic substrate and the non-magnetic substrate, it is wound so that directions of magnetic fields formed around the adjacent through holes are opposite to each other.
Multilayer toroidal coil. A magnetic substrate having a first main surface and a second main surface;
A non-magnetic substrate,
A non-magnetic substrate laminated on at least the first main surface of the magnetic substrate, and a laminate having a third main surface and a fourth main surface;
An external electrode formed on the non-magnetic substrate, disposed on the third main surface;
Coils,
With
The laminate is provided with a through-hole penetrating from the third main surface to the fourth main surface,
The coil is
A first conductor pattern formed on the first main surface of the magnetic substrate;
A second conductor pattern formed on the second main surface of the magnetic substrate;
An outer peripheral end face conductor formed on the outer peripheral end face of the magnetic substrate;
An inner peripheral end face conductor formed on the inner peripheral end face on the through hole side of the magnetic substrate;
Is connected,
A plurality of inner peripheral end surface conductors are formed on the inner peripheral end surface,
The laminate is formed with a convex portion and a concave portion in the through hole viewed from the lamination direction of the magnetic substrate and the non-magnetic substrate,
The plurality of inner peripheral side end surface conductors are formed on the inner peripheral side end surface at positions where the convex portions and the concave portions are formed.
Multilayer toroidal coil. The non-magnetic substrate has a first non-magnetic substrate having one main surface disposed on the first main surface and the other main surface serving as the third main surface, and one main surface on the second main surface. The laminated toroidal coil according to claim 1, further comprising: a second non-magnetic substrate having the other main surface serving as the fourth main surface. 4. The multilayer toroidal coil according to claim 1, wherein an outer edge shape of the multilayer body is a rectangle as viewed from a lamination direction of the magnetic substrate and the nonmagnetic substrate. A plurality of the outer peripheral end surface conductors are formed on the outer peripheral end surface,
The multilayer toroidal coil according to claim 4 , wherein the number of outer peripheral side end surface conductors formed on the outer peripheral side end surface of each side of the multilayer body is equal. The multilayer toroidal coil according to any one of claims 1 to 5 , wherein the external electrode is disposed at a position that does not overlap the first conductor pattern when viewed from the lamination direction of the magnetic substrate and the nonmagnetic substrate. . The coil consists of a conductor whose main component is Ag, stacked toroidal coil according to any one of claims 1 to 6. Forming a magnetic substrate having a first main surface and a second main surface;
Forming a non-magnetic substrate; a non-magnetic substrate forming step;
A conductor forming step of forming a first conductor pattern on the first main surface and forming a second conductor pattern on the second main surface after the magnetic substrate forming step;
After the conductor forming step and the non-magnetic substrate forming step, one main surface of the non-magnetic substrate is disposed on the first main surface, and the other main surface of the non-magnetic substrate is the third main surface. A stacking step of stacking the magnetic substrate and the non-magnetic substrate to obtain a stacked body; and
A through-hole forming step of forming a through-hole penetrating in the stacking direction of the magnetic substrate and the non-magnetic substrate after the stacking step;
A separation step of separating the laminate into pieces after the lamination step;
A heating step of heating the laminate after the separation step;
A method for producing a laminated toroidal coil. The conductor forming step includes a step of forming an interlayer connection conductor for connecting the first conductor pattern and the second conductor pattern to the magnetic substrate,
The method for manufacturing a laminated toroidal coil according to claim 8 , wherein the separating step includes a step of separating the laminated body together with the interlayer connection conductor.

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