JP2016213437A - Element with built-in coil, coil antenna, electronic apparatus and manufacturing method for element with built-in coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an element with a built-in coil, where a coil having a large coil diameter or coil opening is built in a laminate, without cutting the laminate by a special method, and to provide a coil antenna, an electronic apparatus including the same, and a manufacturing method for an element with a built-in coil.SOLUTION: In an element with a built-in coil where a plurality of insulator layers, each having flexibility and including an insulator layer having a coil pattern formed by a conductor, are laminated and a coil is constituted by a coil pattern, in a laminate of insulator layers, an auxiliary member is arranged at a position in the laminate overlapping a part of the coil pattern, in the plan view of the insulator layer from the lamination direction, and deformed in the lamination direction in a region where the insulator layer on which a coil pattern is formed, out of the plurality of insulator layers, overlaps the auxiliary member.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a coil built-in element in which a coil is provided in a laminate, a coil antenna including the coil, an electronic apparatus, and a method for manufacturing the coil built-in element.

  For example, in an electronic component including a coil inside, such as a chip inductor or a chip coil antenna, when the coil is provided inside an insulating substrate, the coil is often provided in a laminate of insulator layers.

  In inductors, it is important to form a coil with a large coil opening when a coil with a predetermined large inductance is provided on an insulating substrate of a limited size, or when a large amount of interlinkage magnetic flux is provided in a coil antenna. is there. Moreover, the direction of the magnetic flux linked to the coil with respect to the mounting surface on the circuit board may be important.

  Patent Document 1 shows that a rectangular parallelepiped laminated body having a coil formed therein is cut obliquely to provide a coil having a coil opening inclined in the laminated body.

Japanese Patent No. 5516552

  In the coil-embedded element disclosed in Patent Document 1, it is difficult to manufacture the laminate in the stacking direction of the insulator layers. Moreover, there exists a possibility that manufacturing cost may increase.

  An object of the present invention is to provide a coil built-in element in which a coil having a large coil diameter or coil opening is built in the laminated body without cutting the laminated body by a special method, a coil antenna including the coil, an electronic device, and a coil built-in element It is to provide a manufacturing method.

(1) The coil built-in element of the present invention is
A plurality of flexible insulator layers each including an insulator layer in which a coil pattern is formed by a conductor is laminated, and a coil by the coil pattern is formed in a laminate formed by laminating the insulator layers. In the coil built-in element,
In a plan view from the stacking direction of the insulator layer, an auxiliary member is disposed at a position in the stack that overlaps a part of the coil pattern,
Of the plurality of insulator layers, the insulator layer on which the coil pattern is formed is deformed in the stacking direction in a region overlapping the auxiliary member.

  With the above structure, a coil having a coil opening inclined with respect to the outermost surface of the laminated insulator layers is disposed in the laminated body, thereby incorporating a coil having a large coil diameter or coil opening. Thus, a coil built-in element is obtained.

(2) In the above (1), due to the deformation of the insulator layer in which the coil pattern is formed in the laminating direction, the opening of the coil is in contact with the outermost surface of the laminated insulator layer. It is preferable to be inclined. That is, the coil built-in element which incorporates a coil with a large coil diameter or coil opening by that is obtained.

(3) In the above (1) or (2), the auxiliary members are arranged in a plurality of different regions in plan view, and the plurality of regions include a large number of the auxiliary members on the upper layer side of the coil pattern forming layer. It is preferable to have the area | region currently formed and the area | region where many said auxiliary members are formed in the lower layer side. Thereby, coil opening inclines efficiently.

(4) In any one of the above (1) to (3), if the auxiliary member is made of the same material as the coil pattern, it is not necessary to prepare a dedicated material for the auxiliary member, which increases the manufacturing cost. Can be avoided.

(5) In any one of the above (1) to (3), if the auxiliary member is made of the same material as the insulator layer, it is not necessary to prepare a dedicated material for the auxiliary member, and the manufacturing cost is reduced. Up is avoided.

(6) In any one of (1) to (3), the auxiliary member may be made of a material having a dielectric constant different from that of the insulator layer. Thereby, it becomes easy to determine the capacity | capacitance between a coil pattern and the conductor of the vicinity.

(7) In any one of (1) to (3), the auxiliary member may be made of a material having a magnetic permeability different from that of the insulator layer. Thereby, for example, formation of a magnetic path and control of the direction of magnetic flux are attained by the arrangement relationship of the magnetic body member with respect to the coil.

(8) In any one of the above (1) to (7), the upper surface or the lower surface of the stacked body is preferably an insulating layer that covers the entire surface of the stacked body. Thereby, the layer interface is not exposed on the upper surface or the lower surface of the laminate, and the surface is less likely to be uneven.

(9) In any one of the above (1) to (8), among the coil patterns formed on a plurality of insulator layers, the coil pattern formed on the insulator layer close to the center in the stacking direction is the center It is preferable that the diameter is larger than that of the coil pattern formed on the insulator layer away from the coil. Thereby, arrangement | positioning of the coil pattern in a laminated body becomes easy, and the space in a laminated body can be utilized effectively. In addition, since coil patterns formed on different insulator layers can be hardly overlapped, an undesired interlayer capacitance between coil patterns can be suppressed.

(10) The coil antenna of the present invention is
The coil-embedded element according to any one of (1) to (8) is provided, and a terminal electrode that is electrically connected to the coil pattern is formed on the outer surface of the laminate.

(11) The electronic apparatus of the present invention
A circuit board is provided, and the coil built-in element according to any one of (1) to (8) is mounted on the circuit board.

  With the above configuration, since the coil-embedded element with a small occupied area is mounted on the circuit board, the electronic device can be reduced in size. Further, by arranging the coil having the coil opening surface inclined with respect to the circuit board, it is possible to control interference and coupling with the conductor pattern formed on the circuit board.

(12) A method for manufacturing a coil built-in element according to the present invention includes:
A plurality of flexible insulator layers each including an insulator layer in which a coil pattern is formed by a conductor is laminated, and a coil by the coil pattern is formed in a laminate formed by laminating the insulator layers. A method for manufacturing an element with a built-in coil,
A first step of preparing a plurality of insulating substrates corresponding to the plurality of insulator layers;
A second step of forming the coil pattern on a predetermined insulating substrate among the plurality of insulating substrates;
In a plan view of the insulating base material, an auxiliary member is disposed on the insulating base material so as to overlap a part of the coil pattern, and the plurality of insulating base materials are stacked to form a laminate. A third step to perform,
A fourth step of deforming the coil pattern forming layer in the stacking direction by pressurizing the stack;
It is characterized by having.

  With the above configuration, a coil built-in element is obtained in which a coil whose coil opening is inclined with respect to the outermost surface of the laminated insulator layers is arranged in the laminate.

(12) In the above (11), the insulating base material is preferably made of a thermoplastic resin, and the fourth step is preferably a step of integrally molding the laminate by a hot press. Thereby, the formation layer of a coil pattern can be greatly deform | transformed in the lamination direction by resin fluidity | liquidity.

  According to the present invention, a coil whose coil opening is inclined with respect to the outermost surface of the laminated insulator layers is disposed in the laminated body, and thus a coil having a large coil diameter or coil opening is arranged. And a built-in coil element in which the direction of the interlinkage magnetic flux is determined. In addition, a coil antenna and an electronic device including the coil built-in element can be obtained.

FIG. 1 is a perspective view of a coil built-in element 101 according to the first embodiment. FIG. 2 is an exploded perspective view of the coil built-in element 101. 3 is a cross-sectional view of the AA portion in FIG. 4A is a cross-sectional view of the coil built-in element 101, and FIG. 4B is a cross-sectional view of the coil built-in element 101S of the comparative example. 5A is a cross-sectional view of the coil built-in element 101, FIG. 5B is an enlarged view of a portion surrounded by an ellipse in FIG. 5A, and FIG. It is sectional drawing which shows the state before pressing. FIG. 6 is an exploded perspective view of the coil built-in element 102 according to the second embodiment. FIG. 7 is an exploded perspective view of the coil built-in element 103 according to the third embodiment. FIG. 8 is a cross-sectional view of the coil built-in element 103. FIG. 9 is a perspective view of the coil built-in element 104 according to the fourth embodiment. FIG. 10 is an exploded perspective view of the coil built-in element 105 according to the fifth embodiment. FIG. 11 is a cross-sectional view of the coil built-in element 105. FIG. 12A is a perspective view in a state where the coil built-in element 101 is mounted on the circuit board 200, and FIG. 12B is a cross-sectional view in that state.

  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 schematic perspective view of a coil built-in element 101 according to the first embodiment. In FIG. 1, the inside of the laminate 90 is shown as seen through. The coil built-in element 101 is used as a coil antenna, for example.

  The coil built-in element 101 includes an insulator layer in which coil patterns 11 and 12 are formed of a conductor. A coil 90 composed of coil patterns 11 and 12 and via conductors V11, V12, and V13 is formed in a laminate 90 formed by laminating insulator layers. Terminal electrodes 51 and 52 are formed on the mounting surface of the coil built-in element 101 (the outer surface of the multilayer body 90). Here, when the terminal electrodes 51 and 52 are also included, about 1.5 turns in the path of the terminal electrode 51 → the via conductor V11 → the coil pattern 11 → the via conductor V12 → the coil pattern 12 → the via conductor V13 → the terminal electrode 52. A coil is configured.

  The laminated body 90 has a rectangular parallelepiped shape, and if the surface parallel to the XY plane in the orthogonal coordinate system shown in FIG. 1 is a mounting surface, the winding axis of the coil by the coil patterns 11 and 12 is inclined from the Z-axis direction. Yes. In the example shown in FIG. 1, it is inclined in the θ direction around the Y axis.

  FIG. 2 is an exploded perspective view of the coil built-in element 101. 3 is a cross-sectional view of the AA portion in FIG. The laminated body 90 of the coil built-in element 101 includes insulator layers S1, S2, S3, S4, first auxiliary members 61 and 62, and second auxiliary members 71 and 72. A coil pattern 11 is formed on the lower surface of the insulator layer S2, and a coil pattern 12 is formed on the lower surface of the insulator layer S3. Terminal electrodes 51 and 52 are formed on the lower surface of the insulator layer S1.

  The insulator layers S1 to S4 and the auxiliary members 61, 62, 71 and 72 are each a flexible sheet such as a liquid crystal polymer (LCP) sheet, and the coil patterns 11 and 12 are, for example, patterned Cu. Metal foil such as foil.

  The first auxiliary members 61 and 62 and the second auxiliary members 71 and 72 overlap a part of the coil patterns 11 and 12 in a plan view from the stacking direction (Z-axis direction) of the insulator layers S1 to S4.

  The first auxiliary members 61 and 62 and the second auxiliary members 71 and 72 are respectively arranged in a plurality of different regions in plan view. The plurality of regions include a region in which many auxiliary members are formed on the upper layer side of the formation layer of the coil patterns 11 and 12 and a region in which many auxiliary members are formed on the lower layer side. In the present embodiment, the first auxiliary members 61 and 62 are disposed on the lower layer side of the coil patterns 11 and 12 and closer to one end in the X-axis direction (rightward from the viewpoint shown in FIGS. 2 and 3). , 72 are arranged on the upper layer side of the coil patterns 11 and 12 and closer to the other end in the X-axis direction (leftward from the viewpoint shown in FIGS. 2 and 3). That is, the auxiliary member is disposed at an asymmetrical position with respect to a line passing through the center of the coil winding region along the surface of the insulator layer.

  The shapes and sizes of the first auxiliary members 61 and 62 are different. The auxiliary member 62 on the side closer to the coil pattern 11, 12 in the laminating direction has a smaller amount of extension from the end face of the laminated body 90 inward than the auxiliary member 61 on the far side. The shape and size of the second auxiliary members 71 and 72 are different. The auxiliary member 72 closer to the coil pattern 11, 12 in the stacking direction has a smaller amount of extension from the end face of the stacked body 90 inward than the auxiliary member 71 farther from the coil pattern 11, 12.

  The coil built-in element 101 is manufactured by the following process, for example.

[First step]
A plurality of insulating substrates having a metal foil on one main surface, for example, a liquid crystal polymer (LCP) sheet, which is a thermoplastic resin, having a Cu foil on one main surface is prepared.

[Second step]
Coil patterns 11 and 12 are formed by patterning a metal foil on a predetermined insulating base material (insulating base material that will later become insulator layers S2 and S3) among the plurality of insulating base materials. Also, via conductors V11, V12, and V13 are formed by forming holes at positions corresponding to the via conductors V11, V12, and V13 and filling the holes with a conductive paste.

[Third step]
Auxiliary members 61, 62, 71, 72 made of the same material as the insulating base material are arranged on the insulating base material so as to overlap a part of the coil patterns 11, 12 in a plan view of the insulating base material. Then, a plurality of insulating base materials are laminated to form a laminated body in a mother substrate state.

[Fourth step]
By integrally molding the laminated body in a mother substrate state with a heat press, the formation layers of the coil patterns 11 and 12 are deformed in the laminating direction. Thereafter, the laminate is cut into individual laminates 90 from the mother substrate state laminate.

  Each of the insulator layers S1 to S4 and the auxiliary members 61, 62, 71, 72 shown in FIG. A force moment is applied and deformed. Accordingly, the positions of the coil patterns 11 and 12 in the partial stacking direction are displaced. As a result, as shown in FIGS. 1, 2, and 3, the coil winding axis AX is inclined from the stacking direction (Z-axis direction) (with respect to the outermost surface of the stacked insulator layers). A coil having a coil opening inclined is formed in the laminate 90.

  FIG. 4A is a cross-sectional view of the coil built-in element 101 of the present embodiment, and FIG. 4B is a cross-sectional view of a coil built-in element 101S of the comparative example. The coil-embedded element 101S of the comparative example has no auxiliary member, an insulator layer S5 is provided between the insulator layers S1 and S2, and an insulator layer S6 is provided between the insulator layers S3 and S4.

  Due to the partial displacement of the coil patterns 11 and 12 in the stacking direction, the coil opening diameter A of the coil built-in element 101 is larger than the coil opening diameter B of the coil built-in element 101S of the comparative example. In this way, a coil built-in element that incorporates a coil having a large coil diameter and coil opening (relatively) relative to the outer size of the laminate 90 is obtained. When this coil built-in element is used as a coil antenna, the coil antenna has a high degree of coupling with the communication partner antenna.

  5A is a cross-sectional view of the coil built-in element 101, FIG. 5B is an enlarged view of a portion surrounded by an ellipse in FIG. 5A, and FIG. 5C is a stacked portion of the portion surrounded by the ellipse. It is sectional drawing which shows the state before pressurization. In FIG. 5A, the part surrounded by an ellipse is the three-surface interface of the second auxiliary member 71, the insulator layer S3, and the insulator layer S4. Since such a three-surface interface is a portion where a relatively large resin flow occurs, irregularities are likely to occur, and an irregular shape may occur. However, since the insulator layer S4 is a layer that covers the entire surface of the multilayer body 90, the three-surface interface is included in the inner surface side of the insulator layer S4. Therefore, the insulator layer S4 absorbs the unevenness, and the upper surface of the stacked body 90 becomes flat.

  5B and 5C show the three-surface interface including the insulator layer S4, the same applies to the three-surface interface including the insulator layer S1, and the lower surface of the stacked body 90 is also flat.

  According to this embodiment, since the insulator layer and the auxiliary member are made of an insulating base material made of the same thermoplastic resin, they can be integrated by a simple construction method by heating and pressing without using an adhesive. . In addition, an element can be formed in which the interface between different materials can be reduced and peeling at the interface hardly occurs.

<< Second Embodiment >>
In the second embodiment, a coil built-in element 102 in which the shape and material of the auxiliary member are different from those in the first embodiment is shown.

  FIG. 6 is an exploded perspective view of the coil built-in element 102 according to the second embodiment. The coil built-in element 102 includes insulator layers S1, S2, S3, S4, S5 and S6, a first auxiliary member 60 and a second auxiliary member 70. A coil pattern 11 is formed on the lower surface of the insulator layer S4, and a coil pattern 12 is formed on the lower surface of the insulator layer S5. Terminal electrodes 51 and 52 are formed on the lower surface of the insulator layer S1.

  The insulator layers S1 to S6 are, for example, liquid crystal polymer (LCP) sheets, and the coil patterns 11 and 12 are, for example, patterned Cu foils. The first auxiliary member 60 and the second auxiliary member 70 are each made of polytetrafluoroethylene (PTFE).

  The first auxiliary member 60 and the second auxiliary member 70 overlap a part of the coil patterns 11 and 12 in a plan view from the stacking direction (Z-axis direction) of the insulator layers S1 to S6. In the present embodiment, the first auxiliary member 60 is disposed on the lower layer side of the coil patterns 11 and 12 and closer to one end in the X-axis direction (rightward from the viewpoint shown in FIG. 6), and the second auxiliary member 70 includes the coil patterns 11 and 12. 12 on the upper layer side and closer to the other end in the X-axis direction (to the left from the viewpoint shown in FIG. 6).

  Each insulator layer S1 to S6 and auxiliary members 60 and 70 shown in FIG. 6 are laminated and integrally molded by heating and pressing. During the heating and pressurization, a moment of couple is applied to the insulator layers S3, S4, and S5 by the auxiliary members 60 and 70, and the insulator layers S3, S4, and S5 are deformed. Accordingly, the positions of the coil patterns 11 and 12 in the partial stacking direction are displaced. As a result, like the coil built-in element 101 shown in the first embodiment, a coil in which the coil winding axis is inclined from the stacking direction (Z-axis direction) is formed in the stack.

  According to the present embodiment, since the auxiliary members 60 and 70 have a lower dielectric constant than the insulator layers S1 to S6, the auxiliary members 60 and 70 are auxiliary between the coil patterns 11 and 12 and the conductor pattern formed at a position facing them. By disposing the members 60 and 70, the capacitance generated between the conductor pattern and the coil patterns 11 and 12 can be reduced. In the example shown in FIG. 6, the capacitance generated between the coil pattern 11 and the terminal electrode 52 is reduced.

  The auxiliary members 60 and 70 may be members having a higher dielectric constant than the insulator layers S1 to S6. In that case, the auxiliary members 60 and 70 are arranged between the coil patterns 11 and 12 and the conductor patterns formed at positions facing them, so that the conductor patterns and the coil patterns 11 and 12 are interposed. The resulting capacity can be increased. For example, the resonance frequency of the coil antenna may be adjusted (set) with the capacity. Moreover, a filter can also be comprised with the said capacity | capacitance and a coil.

<< Third Embodiment >>
In 3rd Embodiment, the example which utilizes an auxiliary member as a magnetic core is shown. FIG. 7 is an exploded perspective view of the coil built-in element 103 according to the third embodiment, and FIG. 8 is a cross-sectional view of the coil built-in element 103.

  The coil built-in element 103 includes insulator layers S1, S2, S3, S4, S5 and S6, a magnetic member 80, a first auxiliary member 60 and a second auxiliary member 70. A coil pattern 11 is formed on the lower surface of the insulator layer S4, and a coil pattern 12 is formed on the lower surface of the insulator layer S5. Terminal electrodes 51 and 52 are formed on the lower surface of the insulator layer S1.

  The insulator layers S1 to S6 are, for example, liquid crystal polymer (LCP) sheets, and the coil patterns 11 and 12 are, for example, patterned Cu foils. The first auxiliary member 60 and the second auxiliary member 70 are each a magnetic ferrite member. The magnetic member 80 is also a similar magnetic ferrite member. Thereby, the insulator layers S1 to S6 and the first auxiliary member 60 and the second auxiliary member 70 are made of materials having different magnetic permeability.

  The arrangement positions of the auxiliary members 60 and 70 with respect to the coil patterns 11 and 12 are the same as those of the coil built-in element 102 shown in FIG. 6 in the second embodiment. The magnetic member 80 is disposed at an intermediate position between the auxiliary members 60 and 70. And the magnetic body member 80 is arrange | positioned inside the coil by the coil patterns 11 and 12 and the via conductors V11, V12, and V13.

  The auxiliary members 60 and 70 and the magnetic member 80 increase the inductance of the coil. Further, since the auxiliary members 60 and 70 and the magnetic member 80 are disposed in the direction inclined from the stacking direction (Z-axis direction), the magnetic flux is directed in that direction. Therefore, when this coil-embedded element 103 is used as a coil antenna, directivity can be given depending on the arrangement direction of the auxiliary members 60 and 70 and the magnetic member 80.

  The auxiliary members 60 and 70 and the magnetic member 80 may be made of a resin sheet such as polyimide (PI) or liquid crystal polymer (LCP) in which a magnetic ferrite filler is dispersed in addition to the sintered magnetic body. .

<< Fourth Embodiment >>
The fourth embodiment shows a coil built-in element having a coil pattern different from the embodiments shown so far.

  FIG. 9 is a schematic perspective view of the coil built-in element 104 according to the fourth embodiment. The coil built-in element 104 includes an insulator layer in which coil patterns 11, 12, and 13 are formed of a conductor. In the laminate 90 formed by laminating insulator layers, coils are formed by the coil patterns 11, 12, 13 and via conductors V11, V12, V13, V14. Terminal electrodes 51 and 52 are formed on the mounting surface of the coil built-in element 104 (the outer surface of the multilayer body 90). Here, when the terminal electrodes 51 and 52 are also included, the path of the terminal electrode 51 → the via conductor V11 → the coil pattern 11 → the via conductor V12 → the coil pattern 12 → the via conductor V13 → the coil pattern 13 → the via conductor V14 → the terminal electrode 52. A coil of about 1.5 turns is configured.

  Unlike the example shown in FIG. 1 in the first embodiment, each of the coil patterns 11, 12, and 13 is a pattern of about 1/2 turn. Thus, the present invention can also be applied when the length of the coil pattern of each layer is short.

<< Fifth Embodiment >>
In the fifth embodiment, a coil built-in element having a coil pattern that is further different from the embodiments shown so far will be described.

  FIG. 10 is a schematic perspective view of the coil built-in element 105 according to the fifth embodiment. FIG. 11 is a cross-sectional view of the main part of the coil built-in element 105. The coil built-in element 105 includes a plurality of insulator layers S1, S2, S3, S4, S5, S6, S7, a first auxiliary member 60, and a second auxiliary member 70. Insulator layers S2, S3, S4, S5, and S6 are formed with coil patterns 11, 12, 13, 14, and 15 of conductors, respectively. Via conductors V11 to V16 are formed in the insulator layers S1 to S6. Terminal electrodes 51 and 52 are formed on the lower surface of the insulator layer S1.

  The insulator layers S1 to S7 are, for example, liquid crystal polymer (LCP) sheets, and the coil patterns 11 to 15 are, for example, patterned Cu foils. The first auxiliary member 60 and the second auxiliary member 70 are members such as a liquid crystal polymer (LCP) sheet or polytetrafluoroethylene (PTFE), respectively.

  The insulator layers S5 and S6 and the second auxiliary member 70 have their left end portions brought close to the left end of the coil-embedded element 105, and the insulator layers S2 and S3 and the first auxiliary member 60 have their right end portions The coil built-in element 105 is arranged in a state of being brought close to the right end. The width of the insulator layers S1, S4, S7 in the X-axis direction is larger than the width of the insulator layer S5 in the X-axis direction. The width of the insulator layers S3 and S5 in the X-axis direction is larger than the width of the insulator layers S2 and S6 in the X-axis direction. Further, the width of the insulator layers S2, S6 in the X-axis direction is larger than the width of the auxiliary members 60, 70 in the X-axis direction.

  In the laminate 90 formed by laminating these insulator layers, coils are formed by the coil patterns 11 to 15 and the via conductors V11 to V16. If the terminal electrodes 51 and 52 are also included, the terminal electrode 51 → via conductor V11 → coil pattern 15 → via conductor V12 → coil pattern 14 → via conductor V13 → coil pattern 13 → via conductor V14 → coil pattern 12 → via conductor V15 → coil A coil of about 4.5 turns is formed in the path of pattern 11 → via conductor V16 → terminal electrode 52.

  As shown in FIG. 11, among the coil patterns 11 to 15 formed in the plurality of insulator layers, the coil pattern formed in the insulator layer near the center in the stacking direction is the insulator layer separated from the center. The diameter is larger than the coil pattern formed on. In this embodiment, the diameter of the coil pattern 13 formed in the insulator layer S4 is larger than the diameter of the coil patterns formed in other insulator layers.

  According to this embodiment, compared with the case where coil patterns having the same diameter are formed in each insulator layer, the coil pattern can be easily arranged in the laminate 90, and the space in the laminate 90 can be used effectively. it can. In addition, since coil patterns formed on different insulator layers can be hardly overlapped, an undesired interlayer capacitance between coil patterns can be suppressed.

  Note that the widths of the insulator layer S2 and the insulator layer S6 in the X-axis direction may be different. Similarly, the width of the insulator layer S3 and the insulator layer S5 in the X-axis direction may be different. Further, the widths of the auxiliary member 60 and the auxiliary member 70 in the X-axis direction may be different.

<< Sixth Embodiment >>
In the sixth embodiment, an example of an electronic device including a coil built-in element is shown. FIG. 12A is a perspective view in a state where the coil built-in element 101 is mounted on the circuit board 200, and FIG. 12B is a cross-sectional view in that state. The circuit board 200 is provided with conductor patterns 91, 92, 93, 94, 95 and the like. The electronic device includes a circuit board 200 on which the coil built-in element 101 is mounted. The configuration of the coil built-in element 101 is as shown in the first embodiment.

  As shown in FIG. 12B, conductor patterns 91 and 92 are present in the lower part of the coil built-in element 101, and there is a predetermined gap therebetween. The coil winding axis AX of the coil built-in element 101 is inclined with respect to the normal direction of the mounting surface of the circuit board 200 so as to face the gap. Therefore, the directivity of the coil antenna is inclined in the direction of the coil winding axis AX, and the magnetic flux interlinking the coils is not easily affected by the conductor patterns 91 and 92.

  In the example shown in FIG. 12B, an example is shown in which the magnetic flux passes between the conductor patterns 91 and 92. However, even if the entire lower part of the coil built-in element 101 is covered with a ground conductor or the like spreading in a planar shape. Good. Even in that case, as shown by the magnetic flux φ, it can pass through the side of the coil built-in element 101, so that it acts as a coil antenna.

  According to the present embodiment, when a conductor pattern or a peripheral component is present in the vicinity of the coil-embedded element 101, a path through which the magnetic flux passes is bent so that the magnetic flux passes through a path that does not approach the nearby conductor pattern or the peripheral component. Can be designed to As a result, unnecessary coupling with peripheral components can be suppressed. In addition, an antenna coil having a large effective size can be formed for a laminated body having a limited volume.

<< Other embodiments >>
In each of the embodiments described above, the example in which the upper surface or the lower surface of the stacked body is configured by an insulating layer that covers the entire surface of the stacked body has been described. The insulating layer that covers the entire surface is an insulating layer. It may be a layer made of a different material. For example, a resist film may be used.

  In each of the embodiments described above, an insulator is used as the auxiliary member, but a conductor pattern may be provided as the auxiliary member. In this case, it is preferable that the conductor pattern is a dummy conductor pattern because it is difficult to cause a change in electrical characteristics such as an unintended short circuit with other conductor patterns. However, the conductor pattern may be electrically connected to the coil pattern.

  It should be noted that the insulator layer and the auxiliary member are made of an insulating base material made of the same thermoplastic resin, and can be integrated by a simple construction method by heating and pressing without using an adhesive. This is preferable in that an interface between materials can be reduced and an element in which peeling at the interface hardly occurs is configured.

  In each of the embodiments described above, an example in which the auxiliary member having a rectangular parallelepiped shape or a step shape in which the auxiliary members are stacked is shown. However, the auxiliary member has a chamfered or rounded ridge portion facing the central direction of the coil. It may also be trapezoidal. As a result, the insulator layer on which the coil pattern is formed easily slopes smoothly in a slope shape, and the entire coil opening surface easily tilts.

  In each embodiment shown above, although the example which provides a 1st auxiliary member and a 2nd auxiliary member was shown, you may provide only any one auxiliary member. In addition, auxiliary members may be arranged above and below the coil pattern at positions overlapping in plan view. Even in such a case, the auxiliary members are arranged in a plurality of different regions in plan view, and the auxiliary member is formed on the upper layer side of the coil pattern forming layer and the auxiliary member is formed on the lower layer side. It is sufficient to have a region that has

  In each embodiment shown above, although the example mainly used as a coil antenna was shown, you may use as an inductor component. Even in that case, the coil opening can be made large, and an inductor component having a large effective size and a large inductance can be obtained with respect to the laminated body having a limited volume. Further, since the direction of the magnetic flux of the coil is inclined, unnecessary coupling with peripheral components and a circuit board can be suppressed, for example.

  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. For example, partial replacements or combinations of the configurations shown in the different embodiments are possible. 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.

AX ... Coil winding axis S1, S2, S3, S4, S5, S6, S7 ... Insulator layers V11, V12, V13, V14, V15, V16 ... Via conductors 11, 12, 13, 14, 15 ... Coil pattern 51 , 52 ... terminal electrodes 60, 61, 62 ... first auxiliary members 70, 71, 72 ... second auxiliary member 80 ... magnetic body member 90 ... laminates 91, 92, 93, 94, 95 ... conductor patterns 101, 102, 103, 104, 105... Coil-embedded element 101S...

Claims (13)

A plurality of flexible insulator layers each including an insulator layer in which a coil pattern is formed by a conductor is laminated, and a coil by the coil pattern is formed in a laminate formed by laminating the insulator layers. In the coil built-in element,
In a plan view from the stacking direction of the insulator layer, an auxiliary member is disposed at a position in the stack that overlaps a part of the coil pattern forming layer,
The coil built-in element, wherein an insulator layer in which the coil pattern is formed among the plurality of insulator layers is deformed in the stacking direction in a region overlapping with an auxiliary member.   The opening of the coil is inclined with respect to the surface of the outermost layer of the laminated insulator layers by deformation of the insulator layer on which the coil pattern is formed in the lamination direction. The coil built-in element of description.   The auxiliary members are respectively arranged in a plurality of different regions in plan view, and the plurality of regions include a region where many auxiliary members are formed on the upper layer side of the coil pattern forming layer and the auxiliary members on a lower layer side. The element with a built-in coil according to claim 1, having a region in which many members are formed.   The coil built-in element according to claim 1, wherein the auxiliary member is made of the same material as the coil pattern.   The coil built-in element according to claim 1, wherein the auxiliary member is made of the same material as the insulator layer.   The coil built-in element according to claim 1, wherein the auxiliary member is made of a material having a dielectric constant different from that of the insulator layer.   The coil built-in element according to claim 1, wherein the auxiliary member is made of a material having a magnetic permeability different from that of the insulator layer.   The coil built-in element according to any one of claims 1 to 7, wherein an upper surface and a lower surface of the multilayer body are insulator layers covering the entire surface of the multilayer body.   Of the coil patterns formed on the plurality of insulator layers, the coil pattern formed on the insulator layer close to the center in the stacking direction has a diameter larger than that of the coil pattern formed on the insulator layer away from the center. The coil built-in element according to any one of claims 1 to 8, wherein:   A coil antenna comprising the coil built-in element according to claim 1, wherein a terminal electrode that is electrically connected to the coil pattern is formed on an outer surface of the laminated body.   The electronic device provided with the circuit board, The electronic device by which the element with a built-in coil in any one of Claim 1 to 8 was mounted in the said circuit board. A plurality of flexible insulator layers each including an insulator layer in which a coil pattern is formed by a conductor is laminated, and a coil by the coil pattern is formed in a laminate formed by laminating the insulator layers. A method for manufacturing an element with a built-in coil,
A first step of preparing a plurality of insulating substrates corresponding to the plurality of insulator layers;
A second step of forming the coil pattern on a predetermined insulating substrate among the plurality of insulating substrates;
In a plan view of the insulating base material, an auxiliary member is disposed on the insulating base material so as to overlap a part of the coil pattern, and the plurality of insulating base materials are stacked to form a laminate. A third step to perform,
A fourth step of deforming the coil pattern forming layer in the stacking direction by pressurizing the stack;
The manufacturing method of the element with a built-in coil which has.   The method for manufacturing a coil built-in element according to claim 12, wherein the insulating base is made of a thermoplastic resin, and the fourth step is a step of integrally forming the laminate by a hot press.

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