Surface Mount Passive Components

Abstract

To prevent difficulty from being increased when mounting a passive element on a circuit board.SOLUTION: A surface-mounted passive component 10 comprises a passive element 20 and a size conversion part 40 where the passive element 20 is packaged. The size conversion part 40 includes: an element assembly 41; a plurality of first external terminals 44 exposed on an element mounting surface 42 of the element assembly 41 and electrically connected with element external terminals 30 of the passive element 20; a plurality of second external terminals 45 exposed on a substrate side mounting surface 43 of the element assembly 41; and connection wiring 48 electrically connecting the first external terminals 44 and the second external terminals 45. An area of the substrate-side mounting surface 43 is larger than an area of a first principal surface 23 of the passive element 20. A total area of the second external terminals 45 on the substrate-side mounting surface 43 is larger than a total area of the element external terminals 30 on the first principal surface 23.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a surface mount passive component. [Background technology]

[0002] In recent years, passive elements mounted on circuit boards of information terminals such as smartphones and tablet terminals have become increasingly smaller. Patent Document 1 discloses an inductor component as an example of such a small passive element. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-102524 A Summary of the Invention [Problem to be solved by the invention]

[0004] The smaller a passive element such as an inductor component becomes, the more difficult it becomes to mount the passive element on a circuit board. [Means for solving the problem]

[0005] A surface mount type passive component for solving the above problem includes a passive element having a first main surface and a second main surface located opposite to the first main surface, the passive element having a plurality of external terminals for an element exposed on the first main surface, and a size conversion section on which the passive element is mounted. The passive element is mounted on the size conversion section in such a manner that the first main surface is located closer to the size conversion section than the second main surface. The size conversion section includes an element mounting surface which is the main surface on which the passive element is mounted, and a board-side mounting surface which is the main surface located opposite to the element mounting surface, a plurality of first external terminals exposed on the element mounting surface and electrically connected to corresponding external terminals for an element among the plurality of external terminals for an element, a plurality of second external terminals exposed on the board-side mounting surface, and connection wiring which electrically connects the first external terminals and the second external terminals. The area of ​​the board-side mounting surface is larger than the area of ​​the first main surface, and the total area of ​​the plurality of second external terminals on the board-side mounting surface is larger than the total area of ​​the plurality of external terminals for an element on the first main surface.

[0006] According to the above configuration, the size of the component mounted on the circuit board, i.e., the surface-mount type passive component, can be increased without changing the size of the passive component itself, which makes it possible to suppress the difficulty of mounting the passive component on the circuit board. Effect of the Invention

[0007] The surface mount type passive component described above can suppress the difficulty of mounting the passive element on a circuit board. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view illustrating a surface mount type passive component according to a first embodiment. [Diagram 2] FIG. [Diagram 3] FIG. 4 is a cross-sectional view of a passive element of the surface mount passive component. [Figure 4] FIG. [Diagram 5] FIG. 11 is a plan view of a surface mount type passive component according to a second embodiment. [Figure 6] FIG. [Figure 7] 4A to 4C are explanatory diagrams of a manufacturing method of the surface mount type passive component. [Figure 8] FIG. [Figure 9] FIG. [Figure 10] FIG. [Figure 11] FIG. [Figure 12] FIG. [Figure 13] FIG. [Figure 14] FIG. [Figure 15] FIG. [Figure 16] FIG. [Figure 17] FIG. [Figure 18] FIG. 11 is a cross-sectional view of a surface mount type passive component according to a third embodiment. [Figure 19] 4A to 4C are explanatory diagrams of a manufacturing method of the surface mount type passive component. [Figure 20] FIG. [Figure 21] FIG. [Figure 22] FIG. [Diagram 23] FIG. [Figure 24] FIG. [Diagram 25] FIG. [Figure 26] FIG. [Figure 27] FIG. [Figure 28] FIG. [Figure 29] FIG. [Diagram 30] FIG. 13 is a cross-sectional view of a surface mount type passive component according to a fourth embodiment. [Diagram 31] FIG. 13 is a cross-sectional view of a surface mount type passive component according to a fifth embodiment. [Diagram 32] FIG. 13 is a cross-sectional view of a surface mount type passive component according to a sixth embodiment. [Diagram 33] FIG. [Diagram 34] FIG. 13 is a cross-sectional view of a surface mount type passive component according to a seventh embodiment. [Diagram 35] FIG. 13 is a cross-sectional view of a surface mount type passive component according to an eighth embodiment. [Diagram 36] FIG. 13 is a cross-sectional view of a surface mount type passive component according to a ninth embodiment. [Figure 37] FIG. [Figure 38] FIG. 13 is a cross-sectional view showing a modification of the surface mount type passive component of the ninth embodiment. [Figure 39] FIG. 23 is a cross-sectional view of a surface mount type passive component according to a tenth embodiment. [Diagram 40] FIG. [Diagram 41] FIG. 23 is a cross-sectional view showing a modification of the surface mount type passive component of the tenth embodiment. [Diagram 42] FIG. 23 is a cross-sectional view of a surface mount type passive component according to an eleventh embodiment. [Diagram 43] FIG. 23 is a cross-sectional view of a surface mount type passive component according to a twelfth embodiment. [Diagram 44] FIG. 23 is a cross-sectional view of a surface mount type passive component according to a thirteenth embodiment. [Diagram 45] FIG. 23 is a cross-sectional view of a surface mount type passive component according to a fourteenth embodiment. [Figure 46] FIG. [Figure 47] 4A to 4C are explanatory diagrams of a manufacturing method of the surface mount type passive component. [Figure 48] FIG. [Figure 49] FIG. [Figure 50] FIG. [Figure 51] FIG. [Figure 52] FIG. [Diagram 53] FIG. [Figure 54] FIG. [Figure 55] FIG. [Figure 56] FIG. [Figure 57] FIG. [Figure 58] FIG. [Figure 59] FIG. [Figure 60] FIG. [Figure 61] FIG. [Figure 62] FIG. [Figure 63] FIG. [Figure 64] FIG. 23 is a cross-sectional view of a surface mount type passive component according to a fifteenth embodiment. [Figure 65] FIG. [Figure 66] 4A to 4C are explanatory diagrams of a manufacturing method of the surface mount type passive component. [Figure 67] FIG. [Figure 68] FIG. [Figure 69] FIG. [Figure 70] FIG. [Figure 71] FIG. [Figure 72] FIG. [Figure 73] FIG. 23 is a cross-sectional view of a surface mount type passive component according to a fifteenth embodiment. [Figure 74] FIG. 23 is a cross-sectional view showing a modification of the surface mount type passive component according to the fifteenth embodiment. [Figure 75] FIG. 23 is a cross-sectional view showing a modification of the surface mount type passive component of the fifteenth embodiment. [Figure 76] FIG. 11 is a perspective view showing a passive member mounted on a size conversion section in a surface mount passive component according to a modified example. [Figure 77] FIG. 11 is a cross-sectional view of a surface mount type passive component according to a modified example. [Figure 78] FIG. 11 is a cross-sectional view of a size conversion portion in a surface mount passive component according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] (First embodiment) Hereinafter, an embodiment of a surface mount type passive component will be described with reference to Figs. 1 to 4. In the drawings, components may be shown enlarged to facilitate understanding. The dimensional ratios of components may differ from the actual ones or from those in other drawings. In addition, although hatching is applied in the cross-sectional views, hatching of some components may be omitted to facilitate understanding.

[0010] As shown in FIG. 1, the surface mount type passive component 10 of this embodiment is mounted on a circuit board CB as indicated by a two-dot chain line. The surface mount type passive component 10 includes a passive element 20 and a size conversion section 40 on which the passive element 20 is mounted. The passive element is an element that has a passive function of consuming, storing, or discharging supplied power. In other words, the passive element does not have an active function of amplifying or rectifying the supplied power. Examples of the passive element include a resistor, an inductor, and a capacitor.

[0011] If the direction in which the circuit board CB, the size conversion section 40, and the passive element 20 are arranged is defined as the "stacking direction X," Fig. 2 is a plan view of the surface mount passive component 10 as viewed from the passive element 20 side in the stacking direction X. As shown in Fig. 2, the size of the size conversion section 40 in a direction perpendicular to the stacking direction X is larger than the size of the passive element 20 in a direction perpendicular to the stacking direction X. That is, the area of ​​the main surfaces 42, 43 of the size conversion section 40 is larger than the area of ​​the main surfaces 22, 23 of the passive element 20. In addition, in a plane perpendicular to the stacking direction X, the passive element 20 is located inside the periphery of the size conversion section 40.

[0012] Fig. 4 is a diagram showing a cross section of the surface mount passive component 10 taken in a direction perpendicular to a line LN1 shown by a dashed line in Fig. 2. Fig. 3 is a diagram showing a cross section of the passive element 20 taken in a direction perpendicular to a line LN2 shown by a dashed line in Fig. 4.

[0013] <Passive elements> As shown in FIG. 3, the passive element 20 is an inductor. The body 21 of the passive element 20 has a magnetic layer made of a magnetic material. The body 21 may be made of one magnetic layer, or may be made of a plurality of magnetic layers stacked along the stacking direction X. For example, the magnetic layer is made of a resin containing a metal magnetic powder. Examples of the metal magnetic powder include iron, nickel, chromium, copper, aluminum, and alloys thereof. Examples of the resin containing the metal magnetic powder include a resin material such as an epoxy resin.

[0014] Of the two main surfaces of the main body 21, the upper main surface in FIG. 4, i.e., the top surface, is referred to as the "second main surface 22," and the lower main surface in FIG. 4, i.e., the bottom surface, is referred to as the "first main surface 23." In other words, the first main surface 23 is disposed on the opposite side to the second main surface 22 in the stacking direction X. In addition, when the passive element 20 is mounted on the size conversion section 40, the first main surface 23 is disposed closer than the second main surface 22. Furthermore, the area of ​​the first main surface 23 is smaller than the area of ​​a board-side mounting surface 43 of the size conversion section 40, which will be described later.

[0015] As shown in FIG. 3 and FIG. 4, the passive element 20 has an inductor wiring 24 provided in the main body 21, an external terminal 30 for an element which is an external terminal of the passive element 20, and a vertical wiring 29 which electrically connects the inductor wiring 24 and the external terminal 30 for an element. The external terminal 30 for an element is exposed to the first main surface 23. That is, when the first main surface 23 is exposed to the outside as in the state before the passive element 20 is mounted on the size conversion section 40, the external terminal 30 for an element is exposed to the outside. However, when the passive element 20 is mounted on the size conversion section 40 as shown in FIG. 4 and the first main surface 23 is not exposed to the outside, the external terminal 30 for an element is also not exposed to the outside. That is, in this specification, when it is expressed that a certain part such as the external terminal 30 for an element is exposed to a certain surface such as the first main surface 23, it is sufficient that the certain part is exposed to the certain surface. Therefore, the part does not need to be exposed to the outside, and for example, as shown in Fig. 4, an external terminal for element 30, which is an example of the part, may be covered by a connection portion 60. The vertical wiring 29 extends from a connection portion with the inductor wiring 24 toward the first main surface 23. In this example, a vertical wiring 29 connected to a first pad 25 of the inductor wiring 24, which will be described in detail later, and a vertical wiring 29 connected to a second pad 26 are provided. An external terminal for element 30 electrically connected to the first pad 25 via the vertical wiring 29, and an external terminal for element 30 electrically connected to the second pad 26 via the vertical wiring 29 are provided.

[0016] The inductor wiring 24 is made of a conductive material. For example, the inductor wiring 24 includes at least one of copper, silver, gold, and aluminum as a conductive material. For example, the inductor wiring 24 may include an alloy including at least one of copper, silver, gold, and aluminum as a conductive material.

[0017] The inductor wiring 24 has a first pad 25, a second pad 26, and a wiring body 27 connecting the first pad 25 and the second pad 26. Each of the pads 25, 26 is a connection portion of the inductor wiring 24 with the vertical wiring 29. The wiring body 27 has a spiral shape centered on the central axis 21z of the body 21 extending in the stacking direction X. Specifically, when viewed from above, the wiring body 27 is wound in a spiral shape that goes around in the counterclockwise direction in FIG. 3 from the outer peripheral end 27b on the radial outside to the inner peripheral end 27a on the radial inside.

[0018] Here, the number of turns of the inductor wiring is determined based on a virtual vector. The starting point of the virtual vector is disposed on a virtual center line that passes through the center of the wiring width of the inductor wiring and extends in the extension direction of the inductor wiring. The virtual vector is tangent to the virtual center line that extends in the extension direction of the inductor wiring when viewed from the thickness direction of the body of the passive element. When the starting point of the virtual vector is moved from one end of the virtual center line to the other end of the virtual center line, the number of turns is determined as "1.0 turn" when the angle by which the virtual vector is rotated is "360°". Therefore, for example, when the wire is wound by "180°", the number of turns is "0.5 turn".

[0019] In this embodiment, the direction of a virtual vector virtually arranged on the wiring body 27 of the inductor wiring 24 is rotated by "540°" when the starting point is moved from the outer peripheral end 27b on the radial outside to the inner peripheral end 27a on the radial inside. Therefore, in this embodiment, the number of turns wound around the wiring body 27 is "1.5 turns".

[0020] Note that, as long as the passive element 20 can function as an inductor, the number of turns of the inductor wiring 24 may be greater than "1.5 turns" or less than "1.5 turns." In other words, an element having an inductor wiring of less than "1.0 turn" may be used as the passive element 20.

[0021] <Size conversion section> As shown in FIG. 4, the size conversion unit 40 has an element mounting surface 42 and a board-side mounting surface 43 as main surfaces. The element mounting surface 42 is the upper surface in FIG. 4, that is, the top surface of the size conversion unit 40. The passive element 20 is mounted on the element mounting surface 42, and the element mounting surface 42 faces the first main surface 23 of the passive element 20. The board-side mounting surface 43 is the lower surface in FIG. 4, that is, the bottom surface of the size conversion unit 40. That is, the board-side mounting surface 43 is disposed on the opposite side to the element mounting surface 42 in the stacking direction X. Therefore, when the surface-mounted passive component 10 is mounted on the circuit board CB, the board-side mounting surface 43 faces the mounting surface of the circuit board CB. Note that, when the direction perpendicular to the board-side mounting surface 43 is defined as the "predetermined direction", in this embodiment, the stacking direction X corresponds to the predetermined direction.

[0022] The element body 41 of the size conversion unit 40 includes an insulating layer. The element body 41 may be configured with only one insulating layer, or may be a laminate in which a plurality of insulating layers are laminated in the lamination direction X.

[0023] When the dimension of the body 21 of the passive element 20 in the stacking direction X is defined as the thickness T1 of the body 21, the distance between the first main surface 23 and the second main surface 22 of the body 21 corresponds to the thickness T1 of the body 21. When the dimension of the element 41 of the size conversion section 40 in the stacking direction X is defined as the thickness T2 of the element 41, the distance between the element mounting surface 42 and the board-side mounting surface 43 corresponds to the thickness T2 of the element 41. In this case, the thickness T2 of the element 41 is thinner than the thickness T1 of the body 21. The thickness T2 of the element 41 may be equal to the thickness T1 of the body 21, or the thickness T2 of the element 41 may be thicker than the thickness T1 of the body 21.

[0024] The DC electrical resistivity of the element body 41 is preferably, for example, equal to or higher than 1 MΩ·cm. The insulating layer constituting the element body 41 contains, for example, polyimide resin, acrylic resin, epoxy resin, phenolic resin, or liquid crystal polymer. To improve the insulating performance of the insulating layer, the insulating layer may contain an insulating filler such as silica filler, or a magnetic filler made of an iron-based alloy. The insulating layer may also be made of ceramic, for example, ferrite.

[0025] Although details will be described later, in the example shown in FIG. 4, a plurality of dummy internal conductors 47 and a plurality of connection wirings 48 are provided as conductors in the size conversion section 40. In FIG. 4, when the portion where the distance between adjacent connection wirings 48 in a direction perpendicular to the stacking direction X (the left-right direction in the figure) is defined as a minimum spacing portion 42a, the element body 41 is configured so that the DC electrical resistance of the minimum spacing portion 42a is "1000 times" or more the DC electrical resistance of the inductor (passive element 20). Note that the distance between adjacent connection wirings 48 and the dummy internal conductor 47 may be narrower than the distance between adjacent connection wirings 48. In this case, when the portion where the distance between adjacent connection wirings 48 and the dummy internal conductor 47 is the minimum is defined as a predetermined portion, the element body 41 may be configured so that the DC electrical resistance of the predetermined portion is "1000 times" or more the DC electrical resistance of the inductor (passive element 20).

[0026] The size conversion section 40 has, as external terminals, a first external terminal 44 exposed on the element mounting surface 42 and a second external terminal 45 exposed on the board-side mounting surface 43. In the example shown in Fig. 4, a plurality (two) of first external terminals 44 are provided on the element mounting surface 42, and a plurality (two) of second external terminals 45 are provided on the board-side mounting surface 43. The first external terminal 44 is electrically connected to the element external terminal 30 of the passive element 20. For example, a connection section 60 made of a conductive material such as solder is interposed between the first external terminal 44 and the element external terminal 30.

[0027] The area of ​​the first external terminal 44 when viewed from the stacking direction X is defined as the "size of the first external terminal 44", the area of ​​the second external terminal 45 when viewed from the stacking direction X is defined as the "size of the second external terminal 45", and the area of ​​the external terminal 30 for elements when viewed from the stacking direction X is defined as the "size of the external terminal 30 for elements". In this case, as shown in FIG. 2, the size of the second external terminal 45 is larger than the size of the external terminal 30 for elements. That is, when the total area of ​​the second external terminals 45 on the board-side mounting surface 43 is defined as the total area of ​​the second external terminals 45, and the total area of ​​the external terminals 30 for elements of the passive elements 20 on the first main surface 23 is defined as the total area of ​​the external terminals 30 for elements, in this embodiment, the total area of ​​the second external terminals 45 is larger than the total area of ​​the external terminals 30 for elements.

[0028] In this case, it is preferable that the size of the first external terminal 44 is larger than the size of the element external terminal 30. In the example shown in Fig. 2, the size of the first external terminal 44 is smaller than the size of the second external terminal 45, but larger than the size of the element external terminal 30. In other words, the area of ​​the portion of the first external terminal 44 exposed on the element mounting surface 42 is smaller than the area of ​​the portion of the second external terminal 45 exposed on the board-side mounting surface 43, but is larger than the area of ​​the portion of the element external terminal 30 exposed on the first main surface 23.

[0029] As shown in Figs. 2 and 4, the size conversion section 40 may have a dummy conductor. The dummy conductor includes a conductive material, but is not electrically connected to the element external terminal 30. In the example shown in Figs. 2 and 4, the size conversion section 40 has a dummy internal conductor 47 and a dummy external terminal 46 as dummy conductors. The dummy external terminal 46 is a terminal that is not electrically connected to the first external terminal 44 among the external terminals exposed on the board-side mounting surface 43. In this example, the dummy external terminal 46 is annular so as to surround each second external terminal 45. The dummy internal conductor 47 is a conductor that is electrically connected to the dummy external terminal 46 among the conductors provided in the element body 41. The dummy internal conductor 47 is not electrically connected to either the first external terminal 44 or the second external terminal 45.

[0030] The size conversion unit 40 has a connection wiring 48 that electrically connects the first external terminal 44 and the second external terminal 45. In the example shown in FIG. 4, the size conversion unit 40 has a connection wiring 48 that electrically connects the first external terminal 44 located on the left side of the figure among the first external terminals 44 and the second external terminal 45 located on the left side of the figure among the second external terminals 45. The size conversion unit 40 also has a connection wiring 48 that electrically connects the first external terminal 44 located on the right side of the figure among the first external terminals 44 and the second external terminal 45 located on the right side of the figure among the second external terminals 45. That is, the connection wiring 48 is a conductor for electrically connecting the corresponding first external terminals 44 and second external terminals 45. When the connection wiring that penetrates the element body 41 is defined as an "internal connection wiring", each connection wiring 48 corresponds to an internal connection wiring that penetrates the element body 41 in the stacking direction X. In the example shown in Fig. 4, the connection wiring 48 is configured so as to electrically connect the first external terminal 44 and the second external terminal 45 via the shortest path. As shown in Figs. 2 and 4, when viewed from the stacking direction X, the first external terminal 44 and the second external terminal 45, which are electrically connected via the connection wiring 48, overlap each other. Therefore, by providing the connection wiring 48 extending in the stacking direction X inside the size conversion section 40, the first external terminal 44 and the second external terminal 45 can be electrically connected via the shortest path.

[0031] Furthermore, when size conversion section 40 has a dummy conductor as shown in FIG. 4, connection wiring 48 is not electrically connected to the dummy conductor. It is preferable that the DC resistivity of the connection wiring 48 is lower than that of the conductor exposed on the element mounting surface 42, for example, the first external terminal 44, and that of the conductor exposed on the board-side mounting surface 43, for example, the second external terminal 45. In this case, the connection wiring 48 is a conductor containing copper, and the first external terminal 44 and the second external terminal 45 can be made of a conductive material having a DC resistivity higher than that of copper. For example, the first external terminal 44 and the second external terminal 45 may be a laminate of multiple conductive layers. The laminate functioning as the external terminal may be a laminate of a layer containing copper, a layer containing nickel, and a layer containing gold, or a laminate of a layer containing nickel and tin, a layer containing silver, and a layer containing copper. Furthermore, the laminate may be a laminate of a layer containing nickel and a layer containing tin.

[0032] <Actions and Effects> The operation and effects of this embodiment will be described. (1-1) The component mounted on the circuit board CB, i.e., the surface-mount type passive component 10, can be increased in size without changing the size of the passive component 20 itself. This makes it possible to prevent the difficulty of mounting the passive component 20 on the circuit board CB from increasing.

[0033] Here, there is a method of enlarging the size of the passive element 20 itself as a method of suppressing the increase in difficulty in mounting the passive element 20 on the circuit board CB without mounting the passive element 20 on the size conversion section 40. In this case, a manufacturer of passive elements needs to prepare multiple types of passive elements with different sizes for each manufacturer that requires passive elements.

[0034] In contrast, in this embodiment, the passive element 20 is mounted on the size conversion section 40. Therefore, the manufacturer does not need to prepare a plurality of types of passive elements 20 with different sizes. (1-2) The total area of ​​the second external terminals 45 on the board-side mounting surface 43 of the size conversion section 40 is larger than the total area of ​​the element external terminals 30 on the first main surface 23 of the passive element 20. Therefore, it is possible to easily bring the second external terminals 45 into contact with the electrodes of the circuit board CB compared to the case where the element external terminals 30 of the passive element 20 are brought into contact with the electrodes of the circuit board CB. This also makes it easier to mount the passive element 20 on the circuit board CB.

[0035] (1-3) The longer the connection wiring 48, the larger the parasitic component resulting from interposing the size conversion section 40 between the passive element 20 and the circuit board CB. The parasitic component here refers to parasitic resistance and parasitic inductance. In this regard, in the present embodiment, the connection wiring 48 is configured to electrically connect the first external terminal 44 and the second external terminal 45 via the shortest path. This makes it possible to suppress the parasitic component resulting from interposing the size conversion section 40 between the passive element 20 and the circuit board CB from becoming large.

[0036] In addition, electrically connecting the first external terminal 44 and the second external terminal 45 via the shortest path means, in a narrow sense, connecting the first external terminal 44 and the second external terminal 45 with one straight-line connecting wiring 48. In a broad sense, it means connecting the first external terminal 44 and the second external terminal 45 with one or more straight-line connecting wirings 48 extending from the first external terminal 44 toward the second external terminal 45 in a direction not far from the second external terminal 45.

[0037] (1-4) The connection wiring 48 can be shortened by making the thickness T2 of the size conversion portion 40 thinner than the thickness T1 of the passive element 20. This makes it possible to suppress an increase in parasitic resistance caused by the presence of the connection wiring 48 in the current path between the element external terminal 30 of the passive element 20 and the electrode of the circuit board CB.

[0038] (1-5) In this embodiment, as shown in FIG. 2, the number of turns of the first external terminal 44 provided on the element mounting surface 42 is less than one turn. Similarly, the number of turns of the second external terminal 45 provided on the board-side mounting surface 43 is less than one turn. The definition of "number of turns" here is the same as the number of turns of the inductor wiring described above. This makes it possible to suppress the generation of unnecessary parasitic inductance, parasitic resistance, and parasitic capacitance in the size conversion section 40.

[0039] (1-6) It is preferable to set the DC electrical resistivity of the connection wiring 48 lower than the DC electrical resistivity of the first external terminal 44 and the second external terminal 45. By setting the DC electrical resistivity of the connection wiring 48 lower in this way, the electrical resistance when a current flows through the size conversion unit 40 can be reduced.

[0040] Furthermore, by forming the first external terminal 44 and the second external terminal 45 into a laminate, the following effects can be expected. The outermost layer of the multiple layers constituting the external terminals 44, 45 may be a parent solder layer that improves solder wettability. Examples of the parent solder layer include a layer containing gold and tin. Examples of the parent solder layer include a layer containing at least one of an alloy containing gold and an alloy containing tin.

[0041] The layer located at the middle of the multiple layers constituting the external terminals 44, 45 may be a corrosion-suppressing layer. The corrosion-suppressing layer may be a layer containing nickel or an alloy containing nickel. This can increase the electromigration resistance of the external terminals 44, 45.

[0042] By making at least one of the multiple layers constituting the external terminals 44, 45 a layer containing copper or an alloy containing copper, the direct current electrical resistivity of the external terminals 44, 45 can be reduced.

[0043] (1-7) By making the DC electrical resistivity of element body 41 equal to or greater than “1 MΩ·cm”, in other words, by increasing the insulation within element body 41, the occurrence of short circuits between conductors within element body 41 can be suppressed.

[0044] (1-8) By configuring element body 41 so that the DC electrical resistance of the minimum spacing portion is at least "1000 times" the DC electrical resistance of the inductor (passive element 20), even if a leakage current occurs in size conversion unit 40, the effect of the leakage current can be kept to a minimum. This is because even if a leakage current occurs in size conversion unit 40, the leakage current flows to the passive element 20 side according to Ohm's law.

[0045] (1-9) Providing a dummy conductor in the size conversion section 40 can improve the heat dissipation of the size conversion section 40. This is because the dummy conductor is made of a conductive material such as a metal, and the thermal conductivity of a conductive material is higher than that of an insulating material.

[0046] Furthermore, when dummy external terminals 46 are provided on the board-side mounting surface 43 as dummy conductors, the dummy external terminals 46 can be fixed to the electrodes of the circuit board CB via connections such as solder. This makes it possible to increase the fixing strength of the surface-mount passive component 10 to the circuit board CB when mounting the surface-mount passive component 10 on the circuit board CB, compared to a case in which the size conversion section 40 does not have the dummy external terminals 46.

[0047] Second embodiment Next, a second embodiment of a surface mount type passive component will be described with reference to Figures 5 to 17. In the following description, differences from the first embodiment will be mainly described, and the same reference numerals will be used to designate the same or corresponding components as those in the first embodiment, and duplicated description will be omitted.

[0048] Fig. 6 is a cross-sectional view of the surface mount passive component 10A of this embodiment taken in a direction perpendicular to the line LN3 shown by the dashed line in Fig. 5. However, for the sake of convenience, detailed structures of passive elements 20A1 and 20A2, which will be described later, are omitted in Fig. 6.

[0049] As shown in FIGS. 5 and 6, a surface mount type passive component 10A includes a plurality of passive elements 20A1, 20A2, and a size conversion section 40A on which the passive elements 20A1, 20A2 are mounted.

[0050] <Passive elements> Each of the passive elements 20A1, 20A2 is mounted on the element mounting surface 42 of the size conversion section 40A. The left-right direction in FIG. 5, in which the passive elements 20A1, 20A2 are arranged, is referred to as the "parallel direction Y". For example, in the example shown in FIG. 5 and FIG. 6, among the passive elements, the passive element located in the first direction (left side in the figure) in the parallel direction Y is referred to as the "passive element 20A1", and the passive element located in the second direction (right side in the figure) in the parallel direction Y is referred to as the "passive element 20A2". In this case, among the passive elements, the distance between the adjacent passive elements 20A1, 20A2 is preferably set to be "10 μm" or more and "500 μm" or less. 6, which are the top surfaces of the passive elements 20A1 and 20A2, will be referred to as "second main surface 22", and the bottom surfaces of the passive elements 20A1 and 20A2, which are the bottom surfaces of the passive elements 20A1 and 20A2, will be referred to as "first main surface 23".

[0051] If the areas of the passive elements 20A1 and 20A2 when viewed from the stacking direction X are defined as the "sizes of the passive elements 20A1 and 20A2," it is preferable that the size of the passive element 20A1 is the same as the size of the passive element 20A2. This allows the area of ​​the first main surface 23 of the passive element 20A1 to be the same as the area of ​​the first main surface 23 of the passive element 20A2. Here, even if the areas of the first main surfaces 23 of the passive elements 20A1 and 20A2 vary within the tolerance allowed in manufacturing the passive elements 20A1 and 20A2, the areas of the first main surfaces 23 are considered to be the same.

[0052] Furthermore, it is preferable that the thickness of the body 21 of the passive element 20A1 is the same as the thickness of the body 21 of the passive element 20A2. Here, even if the thickness of the body 21 varies within the tolerance allowed in manufacturing the passive elements 20A1 and 20A2, the thicknesses of the bodies 21 are considered to be the same.

[0053] Each of the passive elements 20A1 and 20A2 is disposed inside the periphery of the size conversion section 40A. In other words, if the passive element having the smallest area of ​​the main surfaces 22 and 23 among the passive elements 20A1 and 20A2 is defined as the "smallest passive element," the area of ​​the main surfaces 42 and 43 of the size conversion section 40A is "twice" or more the area of ​​the first main surface 23 of the smallest passive element. In the example shown in FIG. 5 and FIG. 6, the area of ​​the first main surface 23 of the passive element 20A1 is the same as the area of ​​the first main surface 23 of the passive element 20A2. Therefore, both of the passive elements 20A1 and 20A2 can be said to be the smallest passive elements.

[0054] 6, the passive element 20A1 is an inductor, and the passive element 20A2 is a capacitor. In this manner, the passive elements 20A1 and 20A2 may have different passive functions. For example, one of the passive elements 20A1 and 20A2 may be a resistor, and the other may be an inductor or a capacitor.

[0055] On the other hand, both of the passive elements 20A1 and 20A2 may be passive elements having the same passive function, that is, each of the passive elements 20A1 and 20A2 may be an inductor, a capacitor, or a resistor.

[0056] In this example, the passive element 20A1 includes two external terminals 30 for elements exposed on the first main surface 23, and the passive element 20A2 includes two external terminals 30 for elements exposed on the first main surface 23. Each external terminal 30 for elements is electrically connected to the first external terminal 44 of the size conversion section 40A via a connection section 60. The connection section 60 includes a conductive material such as solder. The connection section 60 may include the same material as the conductive material contained in the external terminal 30 for elements, or may not include the same material as the conductive material contained in the external terminal 30 for elements. In addition, the connection section 60 may include the same material as the conductive material contained in the first external terminal 44, or may not include the same material as the conductive material contained in the first external terminal 44.

[0057] <Size conversion section> 6, the element body 41A of the size conversion unit 40A has an insulating layer. The element body 41A may be composed of only one insulating layer, or may be a laminate in which multiple insulating layers are laminated in the lamination direction X. The element body 41A may be configured as follows. If the portion of size conversion section 40A where the distance between conductors provided in size conversion section 40A is smallest is defined as the minimum spacing portion, the DC electrical resistance of the minimum spacing portion is set to be "1 time" or more the DC electrical resistance of the capacitor (passive element 20A2) mounted on the element mounting surface 42. The "conductors provided in size conversion section 40A" here refers to connection wirings 48A1, 48A2, and 48A3, which will be described later.

[0058] The element mounting surface 42 of the size conversion section 40A is provided with first external terminals 44 in the same number as the element external terminals 30. The first external terminals 44 are arranged along the parallel direction Y. That is, of the first external terminals 44, the two first external terminals 44 in the first direction of the parallel direction Y (left side in the figure) correspond to the passive element 20A1, and the two first external terminals 44 in the second direction of the parallel direction Y (right side in the figure) correspond to the passive element 20A2.

[0059] The size conversion unit 40A has a plurality of connection wirings 48A1, 48A2, and 48A3. Each of the connection wirings 48A1, 48A2, and 48A3 penetrates the element body 41A in the stacking direction X. If the wiring penetrating the element body 41A is defined as an "internal connection wiring", each of the connection wirings 48A1, 48A2, and 48A3 corresponds to an internal connection wiring. The connection wiring 48A1 is electrically connected to the element external terminal 30 of both element external terminals 30 of the passive element 20A1 that is farther from the passive element 20A2 in the parallel direction Y. The connection wiring 48A3 is electrically connected to the element external terminal 30 of both element external terminals 30 of the passive element 20A2 that is farther from the passive element 20A1 in the parallel direction Y. The connection wiring 48A2 is electrically connected to both of the external terminals 30 for the passive element 20A1, the external terminal 30 for the element that is located closer to the passive element 20A2 in the parallel direction Y, and to the external terminal 30 for the element that is located closer to the passive element 20A1 in the parallel direction Y, among the external terminals 30 for the passive element 20A2.

[0060] The size conversion unit 40A has the same number of second external terminals 45 as the connection wirings 48A1, 48A2, and 48A3. That is, the second external terminals 45 electrically connected to the connection wiring 48A1, the second external terminals 45 electrically connected to the connection wiring 48A2, and the second external terminals 45 electrically connected to the connection wiring 48A3 are arranged along the parallel direction Y.

[0061] The area of ​​the second external terminal 45 when viewed from the stacking direction X is defined as the "size of the second external terminal 45", and the area of ​​the external terminal 30 for elements when viewed from the stacking direction X is defined as the "size of the external terminal 30 for elements". That is, the size of the second external terminal 45 is the area of ​​the second external terminal 45 on the board-side mounting surface 43, and the size of the external terminal 30 for elements is the area of ​​the external terminal 30 for elements on the first main surface 23. In this case, it is preferable to make the size of the second external terminal 45 larger than the size of the external terminal 30 for elements. In detail, when the external terminal for elements having the largest size among the external terminals for elements 30 is defined as the "external terminal for maximum element", it is preferable to make the size of each second external terminal larger than the size of the external terminal for maximum element. Furthermore, even if the number of second external terminals 45 is smaller than the number of element external terminals 30, it is preferable to make the total area of ​​the second external terminals 45 on the substrate side mounting surface 43 larger than the total area of ​​the element external terminals 30 on the first main surface 23.

[0062] In this embodiment, in addition to the effects (1-1) to (1-8) of the first embodiment, the following effects can be obtained. (2-1) A plurality of passive elements 20A1, 20A2 are mounted on the size conversion unit 40A. Therefore, the small passive elements 20A1, 20A2 can be mounted on the circuit board CB at the same time. Therefore, compared to mounting each of the passive elements 20A1, 20A2 individually on the circuit board CB, the effort required to mount each of the passive elements 20A1, 20A2 on the circuit board CB can be reduced.

[0063] (2-2) By configuring the element body 41A so that the DC electrical resistance of the above-mentioned minimum spacing portion is at least “1 time” the DC electrical resistance of the capacitor (passive element 20A2), even if a leakage current occurs within the size conversion portion 40A, the effects of the leakage current can be kept to a minimum.

[0064] (2-3) By setting the distance between adjacent passive elements 20A1, 20A2 to 500 μm or less, an increase in the size of size conversion section 40A can be suppressed. A component mounter having a suction nozzle with a suction diameter of Φ150 μm to Φ900 μm may be used as a component mounter for gripping a passive element when mounting the passive element on a circuit board. In this case, by setting the above-mentioned interval to 500 μm or less, even if a gap is present between the passive elements 20A1 and 20A2, the component mounter can suck (hold) the surface mount type passive component 10A.

[0065] On the other hand, by setting the distance to 10 μm or more, it is possible to prevent short circuits between the wires caused by the distance between the passive elements 20A1 and 20A2 being too narrow. (2-4) By making the areas of the first main surfaces 23 of the passive elements 20A1, 20A2 mounted on the element mounting surface 42 the same, the manufacturing process of the surface mount type passive component 10A can be prevented from becoming complicated.

[0066] <Manufacturing method> Next, an example of a manufacturing method for the above-mentioned surface mount type passive component 10A will be described with reference to Figures 7 to 17. The manufacturing method described here is a method that utilizes a semi-additive method to form the connection wirings 48A1, 48A2, and 48A3.

[0067] The size conversion section 40A is created. As shown in FIG. 7, first, a release layer 110 is formed on the substrate 100. The substrate 100 is plate-shaped. The substrate 100 may be made of, for example, ceramics. In FIG. 7, the upper surface of the substrate 100 is the front surface 101, and the lower surface of the substrate 100 is the back surface 102. The release layer 110 is formed on the substrate 100 so as to cover the entire front surface 101 of the substrate 100. The release layer 110 is formed of a sheet-like member having an adhesive function, such as an infrared curing resin tape, an acrylic resin adhesive, or a polyimide adhesive. For example, the release layer 110 can be formed by attaching such a sheet-like member to the front surface 101 of the substrate 100.

[0068] Next, a conductive layer is formed on the release layer 110 using a conductive material. In Fig. 7, a copper layer 120 is formed as the conductive layer. For example, copper foil is attached to the release layer 110 as the copper layer 120. Then, as shown in Fig. 8, a first insulating layer 130 is formed so as to cover the entire surface 101 of the copper layer 120. For example, the first insulating layer 130 as shown in Fig. 8 can be formed by patterning an insulating resin on the copper layer 120 by photolithography.

[0069] Here, an example of a method for forming the first insulating layer 130 as shown in FIG. 8 by photolithography will be described. That is, a temporary insulating layer is formed by attaching an insulating material to the entire surface of the copper layer 120. Examples of the insulating material include polyimide resin, acrylic resin, epoxy resin, phenol resin, and liquid crystal polymer. Next, a photoresist is applied onto the temporary insulating layer. For example, the photoresist is applied by spin coating. Next, exposure is performed using an exposure device. As a result, the parts of the photoresist corresponding to the positions where the connection wirings 48A1, 48A2, and 48A3 are formed can be removed by a development process described later, and the other parts are hardened. Note that, when a negative type resist is used as the photoresist, the exposed parts of the photoresist are hardened and the other parts are removable. On the other hand, when a positive type resist is used as the photoresist, the exposed parts of the photoresist are removable and the other parts are hardened. Next, the parts of the photoresist corresponding to the positions where the connection wirings 48A1, 48A2, and 48A3 are formed are removed by a development process using a developer. Furthermore, the hardened portion of the photoresist remains on the copper layer 120 as a first protective film. In this state, the portion of the temporary insulating layer to which the first protective film is not attached is removed, for example, by wet etching. After that, when the first protective film is removed, the first insulating layer 130 is formed. Note that the first insulating layer 130 has a plurality of through holes 131 extending in the up-down direction in the figure. Each of these through holes 131 is arranged along the left-right direction in the figure.

[0070] When the formation of the first insulating layer 130 is completed, a photoresist is applied to the surface 101 side of the substrate 100. As a result, the first insulating layer 130 and the portions of the copper layer 120 that are not covered with the first insulating layer 130 are covered. Then, exposure is performed using an exposure device. As a result, the portions of the photoresist corresponding to the positions where the connection wirings 48A1, 48A2, and 48A3 are formed can be removed by a developing process described later, and the other portions are hardened. The portions corresponding to the positions where the connection wirings 48A1, 48A2, and 48A3 are formed are the portions that are connected to the through holes 131 of the first insulating layer 130. Then, as shown in FIG. 8, the portions of the photoresist corresponding to the positions where the connection wirings 48A1, 48A2, and 48A3 are formed are removed by a developing process using a developer. Also, the hardened portions of the photoresist remain on the substrate 100 as the second protective film 140. By patterning the second protective film 140 in this manner, the first wiring pattern PT1 is formed.

[0071] When the formation of the first wiring pattern PT1 is completed, the formation of each of the connection wirings 48A1, 48A2, and 48A3 is started. For example, by performing electrolytic copper plating using a copper sulfate aqueous solution, copper is precipitated on the exposed portion of the copper layer 120. As a result, a part of the connection wiring 48A1, a part of the connection wiring 48A2, and a part of the connection wiring 48A3 are formed as shown in FIG. If a copper sulfate aqueous solution is used in forming each of the connection wirings 48A1, 48A2, and 48A3, a trace amount of sulfur will be contained in each of the connection wirings 48A1, 48A2, and 48A3. Then, the second protective film 140 is removed by wet etching or the like.

[0072] When the removal of the second protective film 140 is completed, the second insulating layer 135 is formed. For example, the second insulating layer 135 can be formed as shown in FIG. 10 by patterning an insulating resin on the first insulating layer 130 by photolithography. In this embodiment, the element body 41A of the size conversion unit 40A is configured by the first insulating layer 130 and the second insulating layer 135. That is, the surface of the second insulating layer 135, which is the upper surface in the figure, corresponds to the element mounting surface 42 of the element body 41A. Next, the position of the second insulating layer 135 where the first external terminal 44 is to be formed is removed by, for example, irradiating it with a laser. As a result, the upper ends in the figure of each of the connection wirings 48A1, 48A2, and 48A3 are exposed to the outside.

[0073] Next, the remaining parts of the connection wiring 48A1, the remaining parts of the connection wiring 48A2, and the remaining parts of the connection wiring 48A3 are formed. For example, copper is precipitated by electrolytic copper plating using a copper sulfate aqueous solution. As a result, as shown in FIG. 11, the remaining parts of the connection wiring 48A1, the remaining parts of the connection wiring 48A2, and the remaining parts of the connection wiring 48A3 are formed. Thus, the formation of each of the connection wirings 48A1, 48A2, and 48A3 is completed. Note that, if a copper sulfate aqueous solution is used when forming each of the connection wirings 48A1, 48A2, and 48A3, each of the connection wirings 48A1, 48A2, and 48A3 will contain a small amount of sulfur. Next, each of the first external terminals 44 is formed. In the example shown in FIG. 11, a laminate including a plurality of layers is formed as the first external terminal 44.

[0074] When the formation of each of the first external terminals 44 is completed, the substrate 100 and release layer 110 are removed, for example by peeling, as shown in Fig. 12. Then, as shown in Fig. 13, a support substrate 150 is attached to the substrate-side mounting surface 43 of the element body 41A. At this time, a release layer may be formed on the surface (upper surface in the figure) of the support substrate 150. Note that if the thickness of the element body 41A is sufficiently thick, the step of attaching the support substrate 150 to the element body 41A may be omitted.

[0075] To form the second external terminals 45, photoresist is applied onto the copper layer 120. Then, exposure is performed using an exposure device. As a result, the portions of the photoresist corresponding to the positions where the second external terminals 45 are to be formed are hardened, and the remaining portions become removable by a developing process described below. Then, by a developing process using a developer, the portions of the photoresist other than the portions corresponding to the positions where the second external terminals 45 are to be formed are removed, as shown in FIG. 13. The hardened portions of the photoresist remain on the copper layer 120 as the third protective film 160. By patterning the third protective film 160 in this manner, the terminal pattern PT2 is formed.

[0076] When the formation of the third protective film 160 is completed, the formation of each second external terminal 45 is started. First, a part of the copper layer 120 is removed. For example, by wet etching, the part of the copper layer 120 that is not covered by the third protective film 160 is removed as shown in FIG. 14. That is, the copper layer 120 remains only at the position where the second external terminal 45 is to be formed, and the copper layer in the other part is removed. Next, the third protective film 160 is removed by wet etching. After that, a plurality of layers are formed on the remaining copper layer 120, and a laminate as shown in FIG. 15 is formed as the second external terminal 45. In this case, the second external terminal 45 becomes a laminate including a layer containing copper.

[0077] When the formation of each second external terminal 45 is completed, the support substrate 150 is peeled off from the element body 41A as shown in Fig. 16. This completes the size conversion section 40A. Then, as shown in Fig. 17, the passive elements 20A1 and 20A2 are mounted on the element mounting surface 42 of the element body 41A. This completes a series of steps constituting the manufacturing method for the surface mount passive component 10A.

[0078] The above manufacturing method is an example of manufacturing the surface mount passive components 10A one by one. However, the manufacturing method of the surface mount passive components 10A is not limited to this. For example, a plurality of portions to become the size conversion parts 40A may be formed in a matrix, and after mounting the passive elements, the portions may be divided into individual pieces by dicing or the like, thereby manufacturing a plurality of surface mount passive components 10A at the same time.

[0079] Third embodiment Next, a third embodiment of a surface mount type passive component will be described with reference to Figures 18 to 29. In the following description, differences from the second embodiment will be mainly described, and the same reference numerals will be used to designate the same or corresponding components as those in the above embodiments, and duplicated description will be omitted.

[0080] As shown in Fig. 18, the surface mount passive component 10B of this embodiment includes a size conversion section 40B and a plurality of passive elements 20A1, 20A2. Each of the passive elements 20A1, 20A2 is mounted on an element mounting surface 42 of an element body 41B in the size conversion section 40B. The element external terminals 30 of the passive elements 20A1, 20A2 may be directly connected to the first external terminals 44B of the size conversion section 40B. In this manner, when no connection section such as solder is interposed between the element external terminals 30 and the first external terminals 44B, the end faces of the connection wirings 48A1, 48A2, 48A3 function as the first external terminals 44B.

[0081] The surface mount passive component 10B includes a sealing portion 65 that seals the passive elements 20A1 and 20A2. The sealing portion 65 includes a sealing resin. That is, the passive elements 20A1 and 20A2 may be resin-sealed as in the surface mount passive component 10B. For example, a molding material, an undercoat material, or an underfill material may be used as the sealing resin. Specifically, a material including a resin such as an epoxy resin, a polyimide resin, an acrylic resin, a phenolic resin, or a liquid crystal polymer, and an insulating filler such as silica may be used as the sealing resin.

[0082] The sealing portion 65 is also in contact with the element mounting surface 42. In addition, the sealing portion 65 entirely covers the second principal surface 22, which is the upper surface in the figure of each of the passive elements 20A1, 20A2, and the non-principal surface 211 connecting the first principal surface 23 and the second principal surface 22.

[0083] In this embodiment, in addition to the effects (1-1) to (1-8) and (2-1) to (2-4) of the above-described embodiments, the following effects can be further obtained. (3-1) By sealing the passive elements 20A1 and 20A2 with resin, the strength of the surface mount type passive component 10B can be increased.

[0084] It is also possible to match the linear expansion coefficient of the sealing portion 65 with that of the size conversion portion 40B, or to match the linear expansion coefficient of the sealing portion 65 with that of the circuit board CB. Matching the linear expansion coefficients in this way can increase the stress resistance of the surface mount passive component 10B.

[0085] <Manufacturing method> Next, an example of a manufacturing method for the above-mentioned surface mount type passive component 10B will be described with reference to Figures 19 to 29. The manufacturing method described here is a method that utilizes a semi-additive method to form the connection wirings 48A1, 48A2, and 48A3.

[0086] Each of the passive elements 20A1 and 20A2 is resin-sealed. As shown in FIG. 19, first, a release layer 110B is formed on the substrate 100. The substrate 100 is plate-shaped. In FIG. 19, the upper surface of the substrate 100 is the front surface 101, and the lower surface of the substrate 100 is the back surface 102. Then, the release layer 110B is formed on the substrate 100 so as to cover the entire front surface 101 of the substrate 100. The release layer 110B is formed of a sheet-like member having an adhesive function, such as an infrared-curable resin tape, an acrylic resin adhesive, or a polyimide adhesive. For example, the release layer 110B can be formed by attaching such a sheet-like member to the front surface 101 of the substrate 100.

[0087] When the formation of the release layer 110B is completed, as shown in FIG. 20, each passive element 20A1, 20A2 is placed on the release layer 110B. At this time, each passive element 20A1, 20A2 is placed on the release layer 110B in a manner that the first main surface 23 faces the surface 111 of the release layer 110B. That is, the element external terminals 30 of each passive element 20A1, 20A2 contact the release layer 110B. Then, a sealing resin is supplied onto the substrate 100 so as to cover the exposed part of the surface of the release layer 110B and the entire side surface of each passive element 20A1, 20A2. For example, a material containing an epoxy resin-based material may be supplied onto the substrate 100 as the sealing resin. Alternatively, such an epoxy resin-based material may be mixed with a filler such as silica and supplied onto the substrate 100 as the sealing resin. As a result, a sealing portion 65 is formed as shown in FIG. 21.

[0088] When the formation of the sealing portion 65 is completed, the release layer 110B and the substrate 100 are removed from the intermediate product 115 as shown in FIG. 22. The intermediate product 115 is composed of the passive elements 20A1 and 20A2 and the sealing portion 65. When the removal is completed, as shown in FIG. 23, a first insulating layer 121B is formed to cover the entire upper surface of the intermediate product 115 in the figure, that is, the surface on the side where the first main surface 23 of each of the passive elements 20A1 and 20A2 is exposed. Next, through holes 122B are formed in the first insulating layer 121B in the portions corresponding to the element external terminals 30 of each of the passive elements 20A1 and 20A2 by laser irradiation or photolithography. As a result, each element external terminal 30 is exposed to the outside.

[0089] Next, photoresist is applied to the intermediate product 115 so as to cover the first insulating layer 121B and each external terminal 30 for the element. Then, by performing exposure using an exposure device, the portions of the photoresist corresponding to the positions where the connection wirings 48A1, 48A2, and 48A3 are to be formed can be removed by a developing process described later, and the other portions are hardened. Next, by a developing process using a developer, the portions of the photoresist corresponding to the positions where the connection wirings 48A1, 48A2, and 48A3 are to be formed are removed, as shown in FIG. 25. In addition, the hardened portions of the photoresist remain on the intermediate product 115 as the first protective film 130B. By patterning the first protective film 130B in this manner, the first wiring pattern PT1B is formed.

[0090] When the formation of the first wiring pattern PT1B is completed, the formation of each of the connection wirings 48A1, 48A2, and 48A3 is started. For example, copper is precipitated on the element external terminals 30 by electrolytic copper plating using a copper sulfate aqueous solution. As a result, as shown in FIG. 26, a part of the connection wiring 48A1, a part of the connection wiring 48A2, and a part of the connection wiring 48A3 are formed. When the copper sulfate aqueous solution is used to form each of the connection wirings 48A1, 48A2, and 48A3, a trace amount of sulfur is contained in each of the connection wirings 48A1, 48A2, and 48A3. Next, as shown in FIG. 27, the first protective film 130B is removed from the intermediate product 115 by wet etching or the like.

[0091] When the removal of the first protective film 130B is completed, the second insulating layer 135B is formed as shown in FIG. 28. That is, the element body 41B of the size conversion section 40B is formed by the first insulating layer 121B and the second insulating layer 135B. Next, the remaining parts of the connection wiring 48A1, the remaining parts of the connection wiring 48A2, and the remaining parts of the connection wiring 48A3 are formed. For example, copper is precipitated by electrolytic copper plating using a copper sulfate aqueous solution. This completes the formation of the connection wirings 48A1, 48A2, and 48A3 as shown in FIG. 29. When the copper sulfate aqueous solution is used in the formation of the connection wirings 48A1, 48A2, and 48A3, a trace amount of sulfur is contained in the connection wirings 48A1, 48A2, and 48A3. After the formation of the connection wirings 48A1, 48A2, and 48A3 is completed, the first external terminals 44B are formed. This completes a series of processes constituting the manufacturing method of the surface mount passive component 10B. The second insulating layer 135B and the first external terminal 44B are formed in the same manner as in the second embodiment, and therefore a detailed description thereof will be omitted here.

[0092] The above manufacturing method is an example of a case where the surface mount passive components 10B are manufactured one by one. However, the manufacturing method of the surface mount passive components 10B is not limited to this. For example, a plurality of portions to become the size conversion parts 40B may be formed in a matrix, and after mounting the passive elements, the portions may be divided into individual pieces by dicing or the like, thereby manufacturing a plurality of surface mount passive components 10B at the same time.

[0093] (Fourth embodiment) Next, a fourth embodiment of a surface mount type passive component will be described with reference to Fig. 30. In the following description, differences from the third embodiment will be mainly described, and the same reference numerals will be used to designate the same or corresponding components as those in the above embodiments, and duplicated descriptions will be omitted.

[0094] As shown in FIG. 30, the surface mount passive component 10B1 of this embodiment has a recess 66 in its sealing portion 65. The recess 66 opens to a top surface 65a of the sealing portion 65, which is the top surface of the sealing portion 65 in the figure. The recess 66 is disposed in a portion between the passive elements 20A1 and 20A2 adjacent to each other in the parallel direction Y. If the portion of the recess 66 that has the largest dimension in the parallel direction Y is defined as the maximum dimension portion, the dimension of the maximum dimension portion in the parallel direction Y is defined as the width of the recess 66, and the dimensions of the passive elements 20A1 and 20A2 in the parallel direction Y are defined as the widths of the passive elements 20A1 and 20A2. In the example shown in FIG. 30, the width of the passive element 20A1 is the same as the width of the passive element 20A2. The width of the recess 66 is preferably half or less of the widths of the passive elements 20A1 and 20A2. Even if the widths of passive elements 20A1 and 20A2 vary within the tolerance range, it can be said that the widths of passive elements 20A1 and 20A2 are the same.

[0095] Furthermore, when the portion where the dimension of the recess 66 in the stacking direction X is the maximum portion is defined as the maximum portion, the dimension of the maximum portion in the stacking direction X is defined as the depth of the recess 66. In this case, the depth of the recess 66 is preferably equal to or less than half the thickness T1 of each of the passive elements 20A1 and 20A2.

[0096] Here, the widths of the two passive elements 20A1, 20A2 located on both sides of the recess 66 in the parallel direction Y may differ from each other. In this case, the width of the recess 66 may be set to half or less of the width of the narrow passive element, which is the passive element having the smaller width of the two passive elements 20A1, 20A2. Also, the depth of the recess 66 may be set to half or less of the thickness of the narrow passive element.

[0097] In this embodiment, in addition to the effects (1-1) to (1-8), (2-1) to (2-4), and (3-1) of the above-described embodiments, the following effects can be further obtained. (4-1) The weight of surface mount passive component 10B1 can be reduced by providing recess 66 in sealing portion 65. In addition, by providing recess 66 in sealing portion 65, it becomes easier to determine whether sealing portion 65 is properly formed or not by the presence or absence of recess 66.

[0098] (4-2) If the width of the recess 66 is too wide, it may be difficult to pick up the surface-mount passive component 10B1 when mounting the surface-mount passive component 10B1 on the circuit board CB. Therefore, it is preferable to set the width of the recess 66 to half or less the width of the passive elements 20A1, 20A2. In this case, the width of the recess 66 is not too wide, so that it is possible to prevent the surface-mount passive component 10B1 from being difficult to pick up.

[0099] (4-3) If the depth of the recess 66 is too large, the thinner portion will be provided in the sealing portion 65, which may reduce the strength of the surface-mounted passive component 10B1. Therefore, it is preferable to set the depth of the recess 66 to half or less the thickness of the passive elements 20A1, 20A2. In this case, the strength of the thinner portion of the sealing portion 65 will not be too low. Therefore, it is possible to suppress the reduction in strength of the surface-mounted passive component 10B1 caused by providing the recess 66 in the sealing portion 65.

[0100] Fifth embodiment Next, a fifth embodiment of a surface mount type passive component will be described with reference to Fig. 31. In the following description, differences from the third embodiment will be mainly described, and the same reference numerals will be used to designate the same or corresponding components as those in the above embodiments, and duplicated description will be omitted.

[0101] 31, the surface mount passive component 10B2 of this embodiment includes a sealing portion 65B1 that seals the passive elements 20A1 and 20A2. The sealing portion 65B1 does not contact the second main surface 22 of the passive elements 20A1 and 20A2. That is, the second main surface 22 of the passive elements 20A1 and 20A2 is exposed to the outside. Furthermore, the sealing portion 65B1 has a thickness changing portion 65b that is thinner toward the outside in the parallel direction Y in a portion outside the passive element 20A1 and a portion outside the passive element 20A2 in the parallel direction Y.

[0102] In this way, the weight of the surface mount type passive component 10B2 can be reduced by making the thickness of the sealing portion 65B1 thinner than that of the sealing portion 65 in the third embodiment. Furthermore, the weight of the surface mount type passive component 10B2 can be reduced by providing the thickness changing portion 65b in the sealing portion 65B1.

[0103] Sixth embodiment Next, a sixth embodiment of a surface mount type passive component will be described with reference to Figures 32 and 33. In the following description, differences from the second embodiment will be mainly described, and the same reference numerals will be used to designate the same or corresponding components as those in the above embodiments, and duplicated description will be omitted.

[0104] As shown in Figs. 32 and 33, the surface mount passive component 10C of this embodiment includes a size conversion section 40A and a plurality of first passive elements 20C1 mounted on the size conversion section 40A. That is, each first passive element 20C1 is mounted on the element mounting surface 42 of the base body 41A of the size conversion section 40A. In the example shown in Figs. 32 and 33, four first passive elements 20C1 are mounted on the element mounting surface 42. Among the directions perpendicular to the stacking direction X, the left-right direction in Figs. 32 and 33 is defined as the "first parallel direction Y1", and the up-down direction in Fig. 33 is defined as the "second parallel direction Y2". In this case, an element group consisting of two first passive elements 20C1 arranged along the first parallel direction Y1 is arranged in the second parallel direction Y2.

[0105] As shown in FIG. 32, when the area of ​​the first passive element 20C1 when the first passive element 20C1 is viewed from the stacking direction X, it is preferable that the size of each first passive element 20C1 is the same. This allows the area of ​​the first main surface 23C1 of each first passive element 20C1 to be the same. Even if the area of ​​the first main surface 23C1 varies within the tolerance range, it can be said that the area of ​​the first main surface 23C1 of each first passive element 20C1 is the same. Furthermore, it is preferable that the thickness of each first passive element 20C1 is the same. Even if the thickness varies within the tolerance range, it can be said that the thickness of each first passive element 20C1 is the same.

[0106] In this embodiment, the first passive element 20C1 has a main body 21, and both an external terminal exposed on the first main surface 23C1 of the main body 21 and an external terminal exposed on the second main surface 22C1 of the main body 21. The external terminal exposed on the first main surface 23C1 is referred to as a "first element external terminal 30C11," and the external terminal exposed on the second main surface 22C1 is referred to as a "second element external terminal 30C12." When the first passive element 20C1 is mounted on the size conversion section 40A, the first main surface 23C1 is located closer to the size conversion section 40A than the second main surface 22C1.

[0107] A plurality of first external terminals 44 electrically connected to the first element external terminals 30C11 are exposed on the element mounting surface 42 of the size conversion section 40A. In the example shown in Fig. 32, a connection section 60C11 such as solder is interposed between the first external terminals 44 and the first element external terminals 30C11.

[0108] The surface mount passive component 10C includes a plurality of second passive elements 20C2 mounted on each first passive element 20C1. If the bottom surface of the main body 21 of the second passive element 20C2 is the first main surface 23C2 and the top surface is the second main surface 22C2, when the second passive element 20C2 is mounted on the first passive element 20C1, the first main surface 23C2 of the second passive element 20C2 is located closer to the first passive element 20C1 than the second main surface 22C2. If the area of ​​the second passive element 20C2 when viewed from the stacking direction X is defined as the "size of the second passive element 20C2," it is preferable that the sizes of the second passive elements 20C2 are all the same. This allows the areas of the first main surfaces 23C2 of the second passive elements 20C2 to be the same. Even if the areas of the first main surfaces 23C2 vary within the tolerance range, the areas of the first main surfaces 23C2 of the second passive elements 20C2 are all the same. Furthermore, by making the size of the second passive element 20C2 the same as the size of the first passive element 20C1, one second passive element 20C2 can be disposed on one first passive element 20C1.

[0109] The second passive element 20C2 has an element external terminal 30C21 which is an external terminal exposed on the first main surface 23C2. The element external terminal 30C21 is electrically connected to the second element external terminal 30C12 of the first passive element 20C1 via a connection part 60C12 such as solder.

[0110] In this embodiment, in addition to the effects (1-1) to (1-8) and (2-1) to (2-4) of the above-described embodiments, the following effects can be further obtained. (6-1) More passive elements can be mounted on one size conversion section 40 A. This makes it possible to prevent the area occupied by surface-mount passive components from becoming large when they are mounted on the circuit board CB.

[0111] Seventh embodiment Next, a seventh embodiment of a surface mount type passive component will be described with reference to Fig. 34. In the following description, differences from the sixth embodiment will be mainly described, and the same reference numerals will be used to designate the same or corresponding components as those in the above embodiments, and duplicated description will be omitted.

[0112] As shown in FIG. 34, the surface mount passive component 10C1 of this embodiment has a sealing portion 65C1 that seals each of the first passive elements 20C1. The sealing portion 65C1 contains the same sealing resin as the sealing portion 65 described in the third embodiment. In this embodiment, the sealing portion 65C1 seals only some of the first passive elements 20C1 and the second passive elements 20C2. In the example shown in FIG. 34, the sealing portion 65C1 seals each of the first passive elements 20C1 and the second passive elements 20C2, but does not seal each of the second passive elements 20C2.

[0113] According to the above configuration, the amount of sealing resin used can be reduced compared to when all passive elements are resin-sealed, and thus the weight of surface mount passive component 10C1 can be prevented from increasing. In this case, it is possible to resin-seal those passive elements that are subject to large stress, and not resin-seal the other passive elements. That is, among the first passive elements 20C1, some of the first passive elements 20C1 that are subject to large stress may be resin-sealed, while the remaining first passive elements 20C1 may not be resin-sealed. Also, among the second passive elements 20C2, some of the second passive elements 20C2 that are subject to large stress may be resin-sealed, while the remaining second passive elements 20C2 may not be resin-sealed.

[0114] Eighth embodiment Next, an eighth embodiment of a surface mount type passive component will be described with reference to Fig. 35. In the following description, differences from the seventh embodiment will be mainly described, and the same reference numerals will be used to designate the same or corresponding components as those in the above embodiments, and duplicated description will be omitted.

[0115] As shown in Fig. 35, a sealing portion 65C2 of a surface mount passive component 10C2 of this embodiment seals all of the passive elements 20C1 and 20C2. In the example shown in Fig. 35, the second main surface 22C2 of each second passive element 20C2 is exposed to the outside.

[0116] 35, the second main surface 22C2 of each second passive element 20C2 is exposed, but a sealing portion 65C2 may be provided so as to cover the second main surface 22C2 of each second passive element 20C2 as well. Also, a sealing portion 65C2 may be provided that covers a portion of the second main surface 22C2 while leaving the remaining portion uncovered.

[0117] According to the above configuration, all the passive elements are resin-sealed, which increases the strength of the surface-mount passive component 10C2. Ninth embodiment Next, a ninth embodiment of a surface mount type passive component will be described with reference to Figures 36 to 38. In the following description, differences from the eighth embodiment will be mainly described, and the same reference numerals will be used to designate the same or corresponding components as those in the above embodiments, and duplicated description will be omitted.

[0118] As shown in FIG. 36 and FIG. 37, the surface mount type passive component 10C3 of this embodiment includes a size conversion portion 40A, a first passive element 20C1 mounted on the element mounting surface 42, and a second passive element 20C3 mounted on the first passive element 20C1. In this embodiment, the size of the second passive element 20C2 is different from the size of the first passive element 20C1. In the example shown in FIG. 36 and FIG. 37, the size of the second passive element 20C3 is larger than the size of the first passive element 20C1. Specifically, the dimension of the second passive element 20C3 in the stacking direction X is the same as the dimension of the first passive element 20C1 in the stacking direction X. On the other hand, the dimension of the second passive element 20C3 in the first parallel direction Y1 is larger than the dimension of the first passive element 20C1 in the first parallel direction Y1. The dimension of the second passive element 20C3 in the second parallel direction Y2 is larger than the dimension of the first passive element 20C1 in the second parallel direction Y2. That is, the area of ​​the first main surface 23C3 of the second passive element 20C3 is larger than the area of ​​the first main surface 23C1 of the first passive element 20C1. Even in this case, the first passive element 20C1 and the second passive element 20C3 are located inside the periphery of the size conversion section 40A.

[0119] In the example shown in FIG. 36, the second passive element 20C3 has a plurality of element external terminals 30C31 exposed on the first main surface 23C3 of the main body 21C3. In addition, a plurality (two) of dummy terminals 30C32 are provided on the first main surface 23C3. That is, the sum of the number of element external terminals 30C31 and the number of dummy terminals 30C32 is the same as the number of second element external terminals 30C12. The second element external terminals 30C12 and the element external terminals 30C31 corresponding to the second element external terminals 30C12 are electrically connected via a connection portion 60C12 such as solder. In addition, the second element external terminals 30C12 and the dummy terminals 30C32 corresponding to the second element external terminals 30C12 are electrically connected via a connection portion 60C12 such as solder.

[0120] 36, the sealing portion 65C2 is provided, but the second main surface 22C3 of the second passive element 20C3 is exposed. However, this is not limited to the above. For example, the sealing portion 65C2 may be provided so as to cover the second main surface 22C3, or the sealing portion 65C2 may be provided so as to cover a portion of the second main surface 22C3 while leaving the remaining portion uncovered.

[0121] Incidentally, in such a surface mount type passive component 10C3, the first passive element 20C1 may have a configuration shown in FIG. 38. The first passive element 20C1 has a first element external terminal 30C11 exposed on the first main surface 23C1, a second element external terminal 30C12 exposed on the second main surface 22C1, and a wiring portion 24C3 having a first end connected to the first element external terminal 30C11 and a second end connected to the second element external terminal 30C12. The body 21 of the first passive element 20C1 includes a magnetic layer made of a magnetic material. That is, the wiring portion 24C3 is surrounded by the magnetic material. This allows the first passive element 20C1 to function as an inductor.

[0122] Tenth embodiment Next, a surface mount type passive component according to a tenth embodiment will be described with reference to Figures 39 to 41. In the following description, differences from the ninth embodiment will be mainly described, and the same reference numerals will be used to designate the same or corresponding components as those in the above embodiments, and duplicated description will be omitted.

[0123] 39 and 40, the surface mount passive component 10C4 of this embodiment includes a first passive element 20C1 and a second passive element 20C4. The size of the second passive element 20C4 is larger than the size of the first passive element 20C1. Specifically, the dimension of the second passive element 20C4 in the first parallel direction Y1 is the same as the dimension of the first passive element 20C1 in the first parallel direction Y1, but the dimension of the second passive element 20C4 in the second parallel direction Y2 is larger than the dimension of the first passive element 20C1 in the second parallel direction Y2. In other words, if the bottom surface of the main surface of the body 21 of the second passive element 20C4 is defined as the first main surface 23C4 and the top surface is defined as the second main surface 22C4, the area of ​​the first main surface 23C4 of the second passive element 20C4 is larger than the area of ​​the first main surface 23C1 of the first passive element 20C1.

[0124] Furthermore, the surface mount passive component 10C4 includes a sealing portion 65C2 that seals both the first passive elements 20C1 and the second passive elements 20C4. The sealing portion 65C2 includes a sealing resin. In this embodiment, the sealing portion 65C2 includes a first sealing portion 67C41 and a second sealing portion 67C42 that are stacked in the stacking direction X. The first sealing portion 67C41 and the second sealing portion 67C42 include different sealing resins. In the example shown in FIG. 39, the first passive elements 20C1 are sealed by the first sealing portion 67C41, and the second passive element 20C4 is sealed by the second sealing portion 67C42. That is, the boundary between the first sealing portion 67C41 and the second sealing portion 67C42 is located between the first passive elements 20C1 and the second passive element 20C4 in the stacking direction X.

[0125] Furthermore, in the example shown in Fig. 39, the second main surface 22C4 of the second passive element 20C4 is also covered with the sealing portion 65C2. Note that, for convenience of explanation, the sealing portion 65C2 is omitted in Fig. 40.

[0126] The second passive element 20C4 has an element external terminal 30C41 which is an external terminal exposed on the first main surface 23C4. The element external terminal 30C41 is electrically connected to the second element external terminal 30C12 of the first passive element 20C1 via a connection part 60C42 such as solder.

[0127] In the sealing portion 65C2, a portion between the first passive element 20C1 and the second passive element 20C4 in the stacking direction X is provided with a plurality of connection wirings that electrically connect the element external terminal 30C41 of the second passive element 20C4 and the second element external terminal 30C12 of the first passive element 20C1. Among the connection wirings, the first connection wiring 70C421 electrically connects the element external terminal 30C41 and the second element external terminal 30C12. The second connection wiring 70C422 electrically connects the element external terminal 30C41 of the second passive element 20C4, the second element external terminal 30C12 of the first passive element 20C1 on the right side in FIG. 39, and the second element external terminal 30C12 of the first passive element 20C1 on the left side in FIG. 39. In other words, the second connection wiring 70C422 can be said to be a wiring that electrically connects the second element external terminals 30C12 of the first passive elements 20C1 adjacent to each other.

[0128] According to the above configuration, the external terminals of the passive elements 20C1 and 20C4 can be electrically connected by providing the connection wirings 70C421 and 70C422 in the sealing portion 65C2, which increases the degree of freedom in connecting the passive elements and therefore the degree of freedom in designing the surface mount passive component 10C4.

[0129] In such a surface mount type passive component 10C4, a connection wiring 70C423 as shown in FIG. 41 may be provided in the sealing portion 65C2. In the example shown in FIG. 41, a second passive element 20C3 is provided as the second passive element. In this case, a connection wiring 70C423 may be provided instead of the second connection wiring 70C422. The connection wiring 70C423 electrically connects the second element external terminals 30C12 of the first passive elements 20C1 adjacent to each other, but does not electrically connect the second element external terminal 30C12 and the element external terminal 30C21.

[0130] Eleventh embodiment Next, an eleventh embodiment of a surface mount type passive component will be described with reference to Fig. 42. In the following description, differences from the eighth embodiment will be mainly described, and the same reference numerals will be used to designate the same or corresponding components as those in the above embodiments, and duplicated description will be omitted.

[0131] As shown in FIG. 42, a surface mount type passive component 10C of this preferred embodiment includes a size conversion portion 40A, a plurality of first passive elements 20C1, and a plurality of second passive elements 20C2. In FIG. 42, a "predetermined axis Z0" is indicated by a dashed line, which is a straight line extending in the stacking direction X and passing through the center of gravity of the size conversion section 40A. In addition, in the stacking direction X, a portion where each first passive element 20C1 is located is referred to as a "first mounting layer LY1", and a portion where each second passive element 20C2 is located is referred to as a "second mounting layer LY2". A straight line extending in the stacking direction X and passing through the center of gravity of the first mounting layer LY1 is referred to as a "first axis Z1", and a straight line extending in the stacking direction X and passing through the center of gravity of the second mounting layer LY2 is referred to as a "second axis Z2". In FIG. 42, the first axis Z1 is indicated by a dashed line, and the second axis Z2 is indicated by a dashed line.

[0132] In this embodiment, the center of gravity of the size conversion section 40A is the center of the board-side mounting surface 43. The center of gravity of the first mounting layer LY1 is a position that is equidistant from the centers of the first passive elements 20C1 included in the first mounting layer LY1 when the first mounting layer LY1 is viewed from the stacking direction X. The center of gravity of the second mounting layer LY2 is a position that is equidistant from the centers of the second passive elements 20C2 included in the second mounting layer LY2 when the second mounting layer LY2 is viewed from the stacking direction X.

[0133] 42, the first axis Z1 and the second axis Z2 overlap with the predetermined axis Z0. That is, the predetermined axis Z0 passes through both the center of gravity of the first mounting layer LY1 and the center of gravity of the second mounting layer LY2.

[0134] According to the above configuration, the center of gravity of the size conversion part 40A, the center of gravity of the first mounting layer LY1, and the center of gravity of the second mounting layer LY2 overlap on a plane perpendicular to the stacking direction X, making it easier to pick up the surface mount passive component 10C. As a result, the surface mount passive component 10C can be easily handled when mounting the surface mount passive component 10C on the circuit board CB.

[0135] Twelfth embodiment Next, a surface mount type passive component according to a twelfth embodiment will be described with reference to Fig. 43. In the following description, differences from the eleventh embodiment will be mainly described, and the same reference numerals will be used to designate the same or corresponding components as those in the above embodiments, and duplicated description will be omitted.

[0136] As shown in FIG. 43, a surface mount type passive component 10C of this preferred embodiment includes a size conversion portion 40A, a plurality of first passive elements 20C1, and a plurality of second passive elements 20C2. 43, the first axis Z1 overlaps with the predetermined axis Z0, but the second axis Z2 does not overlap with the predetermined axis Z0. That is, the predetermined axis Z0 passes through the center of gravity of the first mounting layer LY1, but does not pass through the center of gravity of the second mounting layer LY2.

[0137] 43, the second axis Z2 of the surface mount passive component 10C overlaps with the predetermined axis Z0, but the first axis Z1 does not have to overlap with the predetermined axis Z0. In this case, the predetermined axis Z0 passes through the center of gravity of the second mounting layer LY2, but does not pass through the center of gravity of the first mounting layer LY1. By aligning the center of gravity of the second mounting layer LY2, which is the outermost layer, with the center of gravity of the size conversion section 40A, which is the bottom layer, in this way, it becomes easier to pick up the surface mount passive component 10C.

[0138] Thirteenth embodiment Next, a thirteenth embodiment of a surface mount type passive component will be described with reference to Fig. 44. In the following description, differences from the ninth embodiment will be mainly described, and the same reference numerals will be used to designate the same or corresponding components as those in the above embodiments, and duplicated descriptions will be omitted.

[0139] As shown in FIG. 44, a surface mount type passive component 10C of this preferred embodiment includes a size conversion portion 40A, a plurality of first passive elements 20C1, and a plurality of second passive elements 20C2. In the example shown in Fig. 44, the first axis Z1 does not overlap with either the predetermined axis Z0 or the second axis Z2. Furthermore, the second axis Z2 does not overlap with the predetermined axis Z0 either. In other words, the predetermined axis Z0 does not pass through either the center of gravity of the first mounting layer LY1 or the center of gravity of the second mounting layer LY2.

[0140] In this way, by allowing the center of gravity of the size conversion section 40A, the center of gravity of the first mounting layer LY1, and the center of gravity of the second mounting layer LY2 to be misaligned with each other on a plane perpendicular to the stacking direction X, the degree of freedom in the installation position of the passive elements on the size conversion section 40A can be increased.

[0141] Fourteenth embodiment Next, a surface mount type passive component according to a fourteenth embodiment will be described with reference to Figures 45 to 63. In the following description, the same reference numerals will be used to designate the same or corresponding members as those in the above embodiments, and duplicated description will be omitted.

[0142] A surface mount type passive component 10E of this embodiment is shown in Fig. 45 and Fig. 46. Fig. 45 is a diagram showing a cross section of the surface mount type passive component 10E taken in a direction perpendicular to a line LN4 shown by a dashed line in Fig. 46.

[0143] The surface mount passive component 10E includes a size conversion layer 50 and a passive function layer 80 laminated on the size conversion layer 50. That is, the passive function layer 80 is mounted on the top surface (upper surface in the figure) of the size conversion layer 50. In this embodiment, the up-down direction in FIG. 45, which is the direction in which the size conversion layer 50 and the passive function layer 80 are laminated, corresponds to the lamination direction X. Note that, if the portion laminated on the size conversion layer 50 is defined as a "passive element body," then the passive function layer 80 corresponds to the passive element body.

[0144] <Passive function layer> The passive functional layer 80 has a main functional layer 81 and a cover layer 82 located on the opposite side of the size conversion layer 50 with the main functional layer 81 sandwiched therebetween. Of the two main surfaces of the main functional layer 81, a first functional main surface 81a, which is the lower surface in FIG. 45, contacts the size conversion layer 50, and a second functional main surface 81b, which is the upper surface in FIG. 45, contacts the cover layer 82. When the main surface of the main functional layer 81 that contacts the size conversion layer 50 is defined as a boundary main surface, the first functional main surface 81a corresponds to the boundary main surface. The main functional layer 81 may be composed of one magnetic layer, or may be a laminate in which multiple magnetic layers are laminated in the lamination direction X. The magnetic layer is composed of, for example, a resin containing metal magnetic powder.

[0145] In the main functional layer 81, a plurality of passive function units 200 are provided along a direction perpendicular to the stacking direction X. The left-right direction in FIG. 45 in which the passive function units 200 are lined up is called the "parallel direction Y". The passive function unit performs at least one of the passive functions of consuming, storing, and discharging the supplied power. For example, the passive function unit may be an inductor, a capacitor, or a resistor. Therefore, the passive function unit 200 may be regarded as a passive element. In this case, it can be said that the passive function layer 80 has the above-mentioned passive element built in. Specifically, it can be said that the passive function layer 80 has a plurality of passive elements built in.

[0146] In the examples shown in FIG. 45 and FIG. 46, each passive function unit 200 is an inductor. That is, each passive function unit 200 has an inductor wiring 240 and a lead-out wiring 290 connected to the inductor wiring 240. The main component of the inductor wiring 240 and the main component of the lead-out wiring 290 are the same conductive material. The conductive material that is the main component of the inductor wiring 240 and the lead-out wiring 290 includes at least one of silver, copper, aluminum, titanium, nickel, and gold as a conductive material. For example, the conductive material that is the main component of the inductor wiring 240 and the lead-out wiring 290 may be an alloy that includes at least two of silver, copper, aluminum, titanium, nickel, and gold. When a conductor is analyzed by energy dispersive X-ray analysis (EDX), for example, a component that is "80% vol%" or more can be regarded as the main component.

[0147] The inductor wiring 240 and the lead-out wiring 290 are provided in the main functional layer 81. In other words, it can be said that the inductor wiring 240 and the lead-out wiring 290 are in contact with a magnetic layer. Therefore, when a current is passed through the inductor wiring 240, a magnetic field is generated by consuming power. Therefore, if a wiring that exerts a passive function when a current is passed through it is defined as a "functional wiring," then the inductor wiring 240 corresponds to the functional wiring.

[0148] The number of turns of each inductor wiring 240 is preferably equal to or greater than 1.0 turn. If the passive function unit 200 can function as an inductor, the number of turns of the inductor wiring may be less than 1.0 turn. The definition of the number of turns has been explained in the first embodiment, and will not be explained here.

[0149] Each of the lead-out wirings 290 extends from a connection portion with the inductor wiring 240 toward the size conversion layer 50. That is, each of the lead-out wirings 290 extends to the first functional principal surface 81a of the main functional layer 81, and therefore, among both ends of each of the lead-out wirings 290, the end not connected to the inductor wiring 240 functions as an external terminal of the passive function unit 200. The external terminal of the passive function unit 200 is also called a "functional external terminal 300". When the passive function unit 200 is viewed as a passive element, the functional external terminal 300 corresponds to an element external terminal of the passive element. In the example shown in FIG. 45 and FIG. 46, each of the passive function units 200 has two functional external terminals 300. That is, four functional external terminals 300 are arranged on the first functional principal surface 81a along the parallel direction Y. The parallel direction Y is a direction perpendicular to the stacking direction X, which is the left-right direction in the figure.

[0150] The cover layer 82 may be composed of one magnetic layer, or may be a laminate in which a plurality of magnetic layers are laminated in the lamination direction X. The magnetic layer is composed of, for example, a resin containing metal magnetic powder. The magnetic layer constituting the cover layer 82 may contain a material that is not contained in the magnetic layer constituting the main functional layer 81. By disposing the cover layer 82 on the main functional layer 81, each inductor wiring 240 is covered by the cover layer 82.

[0151] <Size conversion layer> The size conversion layer 50 is a laminate in which a plurality of insulating layers are laminated in the lamination direction X. If the layer in contact with the passive function layer 80 among the insulating layers is the boundary layer 51, it can be said that the passive function section 200 corresponding to the passive element is mounted on the surface of the boundary layer 51. From this viewpoint, it can be said that the surface of the boundary layer 51 is the element mounting surface 42E on which the passive element is mounted. Among the insulating layers constituting the size conversion layer 50, the layer located at the bottom in FIG. 45 is the board-side surface layer 52 that faces the mounting surface of the circuit board CB when the surface-mounted passive component 10E is mounted on the circuit board CB. It can be said that the surface of the board-side surface layer 52, that is, the lower surface in the figure, is the board-side mounting surface 43E. It should be noted that the portion of the size conversion layer 50 located between the boundary layer 51 and the board-side surface layer 52 in the lamination direction X is called the base layer 53.

[0152] The size conversion layer 50 is provided with a first external terminal exposed on the element mounting surface 42E and a second external terminal exposed on the board-side mounting surface 43E. The first external terminal is electrically connected to the functional external terminal 300. In the example shown in Fig. 45 and Fig. 46, three first external terminals 44Ea, 44Eb, 44Ec are arranged along the parallel direction Y. Of the first external terminals 44Ea, 44Eb, 44Ec, the first external terminal 44Ea located in the first direction of the parallel direction Y (left side in the figure) is electrically connected to one functional external terminal 300. The first external terminal 44Ec located in the second direction of the parallel direction Y (right side in the figure) is electrically connected to one functional external terminal 300. The remaining first external terminal 44Eb is electrically connected to the two central functional external terminals 300.

[0153] 45 and 46, each of the first external terminals 44Ea, 44Eb, and 44Ec is configured from one layer, but is not limited to this. For example, each of the first external terminals 44Ea, 44Eb, and 44Ec may be a laminate in which multiple layers are stacked.

[0154] The second external terminal is electrically connected to an electrode of the circuit board CB. In the example shown in Fig. 45 and Fig. 46, two second external terminals 45Ea, 45Ec are provided. The second external terminal 45Ea is disposed at a position corresponding to the first external terminal 44Ea in the parallel direction Y. The second external terminal 45Ec is disposed at a position corresponding to the first external terminal 44Ec in the parallel direction Y. In the example shown in Fig. 45 and Fig. 46, each of the second external terminals 45Ea, 45Ec is a laminated body in which a plurality of layers are laminated, but this is not limited thereto. For example, each of the second external terminals 45Ea, 45Ec may be composed of a single layer.

[0155] The areas of the first external terminals 44Ea, 44Eb, and 44Ec on the element mounting surface 42E are larger than the areas of the first functional principal surface 81a of the functional external terminals 300 electrically connected to the first external terminals 44Ea, 44Eb, and 44Ec. That is, the area of ​​the first external terminal 44Ea on the element mounting surface 42E is larger than the area of ​​the first functional principal surface 81a of the functional external terminal 300 electrically connected to the first external terminal 44Ea. The area of ​​the first external terminal 44Ec on the element mounting surface 42E is larger than the area of ​​the first functional principal surface 81a of the functional external terminal 300 electrically connected to the first external terminal 44Ec. The area of ​​the first external terminal 44Eb on the element mounting surface 42E is larger than the sum of the areas of the first functional principal surface 81a of the two functional external terminals 300 electrically connected to the first external terminal 44Eb. The area of ​​the second external terminals 45Ea, 45Ec on the board-side mounting surface 43E is larger than the area of ​​the first external terminals 44Ea, 44Ec electrically connected to the second external terminals 45Ea, 45Ec on the element mounting surface 42E. Furthermore, the total area of ​​the first external terminals 44Ea, 44Ec on the element mounting surface 42E is larger than the total area of ​​the functional external terminals 300 on the first functional principal surface 81a.

[0156] A connection wiring 48Ea electrically connecting the first external terminal 44Ea and the second external terminal 45Ea, and a connection wiring 48Ec electrically connecting the first external terminal 44Ec and the second external terminal 45Ec are provided in the base layer 53. Each of the connection wirings 48Ea, 48Ec extends in the stacking direction X. Furthermore, an internal conductor 48Eb connected to the first external terminal 44Eb is provided in the base layer 53. Each of the connection wirings 48Ea, 48Ec penetrates the base layer 53 in the stacking direction X, while the internal conductor 48Eb does not penetrate the base layer 53.

[0157] As described above, when one passive function unit 200 is viewed as a passive element, the size conversion layer 50 can be said to enlarge the size of the passive function unit 200. In other words, the size conversion layer 50, the first external terminals 44Ea, 44Eb, 44Ec, the second external terminals 45Ea, 45Ec, the connection wirings 48Ea, 48Ec, and the internal conductor 48Eb constitute a "size conversion unit 40E" on which a passive element is mounted. In this case, the size conversion layer 50 corresponds to the "base body of the size conversion unit 40E."

[0158] <Actions and Effects> The operation and effects of this embodiment will be described. (14-1) The component mounted on the circuit board CB, i.e., the surface-mounted passive component 10E, can be increased in size without changing the size of the passive function unit 200 corresponding to the passive element. This makes it possible to prevent the difficulty of mounting the passive element on the circuit board CB from increasing.

[0159] (14-2) The total area of ​​each of the second external terminals 45Ea, 45Ec is larger than the total area of ​​each of the functional external terminals 300. Therefore, it is possible to easily bring the second external terminals 45Ea, 45Ec into contact with the electrodes of the circuit board CB, compared to the case where the functional external terminals 300 are brought into contact with the electrodes of the circuit board CB. This also makes it easier to mount the passive elements on the circuit board CB.

[0160] (14-3) In the size conversion layer 50, the connection wirings 48Ea, 48Ec are configured to connect the first external terminals 44Ea, 44Ec and the second external terminals 45Ea, 45Ec via the shortest path. This makes it possible to suppress an increase in parasitic components caused by interposing the size conversion portion 40E between the passive elements and the circuit board CB.

[0161] (14-4) By making the main components of the inductor wiring 240 and the lead-out wiring 290 the same, the connection reliability between the inductor wiring 240 and the lead-out wiring 290 can be increased.

[0162] <Manufacturing method> Next, an example of a manufacturing method for the above-mentioned surface mount type passive component 10E will be described with reference to Fig. 47 to Fig. 63. The manufacturing method described here is a method that uses a semi-additive method to form the inductor wiring 240, the lead-out wiring 290, the connection wirings 48Ea and 48Ec, and the internal conductor 48Eb.

[0163] First, the main functional layer 81 of the passive functional layer 80 is formed. That is, as shown in FIG. 47, a conductive layer is formed on the substrate 100E by a conductive material. The substrate 100E is plate-shaped. For example, ceramics can be used as the material of the substrate 100E. In FIG. 47, the upper surface of the substrate 100E is the front surface 101, and the lower surface of the substrate 100E is the back surface 102. In the example shown in FIG. 47, a copper layer 110E is formed as the conductive layer. For example, copper foil is attached to the substrate 100E as the copper layer 110E so as to cover the entire front surface 101. When the formation of the copper layer 110E is completed, a photoresist is applied on the copper layer 110E. For example, the photoresist is applied by spin coating. Next, exposure is performed using an exposure device. As a result, the portion of the photoresist corresponding to the position where the inductor wiring 240 is to be formed can be removed by a development process described later, and the other portions are hardened. Then, a developing process using a developer removes the portion of the photoresist corresponding to the position where the inductor wiring 240 is to be formed, as shown in Fig. 48. The hardened portion of the photoresist remains on the copper layer 110E as the first protective film 115E. By patterning the first protective film 115E in this manner, the wiring pattern PTE1 is formed.

[0164] When the formation of the wiring pattern PTE1 is completed, each inductor wiring 240 is formed. For example, by performing electrolytic copper plating using a copper sulfate aqueous solution, copper is precipitated in the portion of the copper layer 110E that is not covered by the first protective film 115E. As a result, each inductor wiring 240 is formed as shown in FIG. 49. When the copper sulfate aqueous solution is used to form each inductor wiring 240, each inductor wiring 240 contains a small amount of sulfur. When the formation of each inductor wiring 240 is completed, the first protective film 115E is removed from the copper layer 110E by wet etching or the like.

[0165] After the removal of the first protective film 115E is completed, a photoresist is applied onto the copper layer 110E. For example, the photoresist is applied by spin coating. Then, exposure is performed using an exposure device. As a result, the portion of the photoresist corresponding to the position where the lead-out wiring 290 is to be formed becomes removable by a developing process described later, and the other portions are hardened. Then, as shown in FIG. 50, the portion of the photoresist corresponding to the position where the lead-out wiring 290 is to be formed is removed by a developing process using a developer. Moreover, the hardened portion of the photoresist remains on the copper layer 110E as the second protective film 117E. By patterning the second protective film 117E in this manner, the wiring pattern PTE2 is formed.

[0166] When the formation of the wiring pattern PTE2 is completed, each of the lead-out wirings 290 is formed. For example, by performing electrolytic copper plating using a copper sulfate aqueous solution, copper is precipitated in the portion of the inductor wiring 240 that is not covered by the second protective film 117E. As a result, each of the lead-out wirings 290 is formed as shown in FIG. 51. When the copper sulfate aqueous solution is used to form each of the lead-out wirings 290, each of the lead-out wirings 290 contains a small amount of sulfur. When the formation of each of the lead-out wirings 290 is completed, the second protective film 117E is removed by wet etching or the like. At this time, the portion of the copper layer 110E that is not in contact with the inductor wiring 240 is also removed.

[0167] When removal of a portion of the copper layer 110E and the second protective film 117E is completed, the first magnetic sheet 120E shown in FIG. 52 is pressed from above in the figure. As a result, each inductor wiring 240 and each lead wiring 290 are embedded in the first magnetic sheet 120E. The first magnetic sheet 120E may be a single-layer sheet or a laminated body in which multiple layers are stacked. In this case, the main functional layer 81 is configured by the first magnetic sheet 120E. Then, the process shifts from the process of forming the main functional layer 81 to the process of forming the size conversion layer 50.

[0168] As shown in FIG. 53, the boundary layer 51 of the size conversion layer 50 is formed on the main functional layer 81. For example, the boundary layer 51 can be formed by patterning an insulating resin on the passive functional layer 80 by photolithography. In addition, through holes 122 are formed in the boundary layer 51 at positions where the first external terminals 44Ea, 44Eb, and 44Ec are to be formed. Then, as shown in FIG. 54, a conductive layer 125E that covers the boundary layer 51 is formed. For example, the conductive layer 125E can be a layer containing copper. In this case, the conductive layer 125E can be formed by, for example, electroless plating. By providing the conductive layer 125E in this way, the part of the surface of the passive functional layer 80 that is not covered by the boundary layer 51 is covered by the conductive layer 125E. In addition, the part of the conductive layer 125E that covers the surface of the main functional layer 81 constitutes the first external terminals 44Ea, 44Eb, and 44Ec.

[0169] When the formation of the conductive layer 125E is completed, a photoresist is applied onto the conductive layer 125E. For example, the photoresist is applied by spin coating. Then, the conductive layer 125E is covered. Then, exposure is performed using an exposure device. As a result, the portions of the photoresist corresponding to the positions where the connection wirings 48Ea, 48Ec and the internal conductor 48Eb are formed can be removed by a development process described later, and the other portions are hardened. Then, as shown in FIG. 55, the portions of the photoresist corresponding to the positions where the connection wirings 48Ea, 48Ec and the internal conductor 48Eb are formed are removed by a development process using a developer. In addition, the hardened portions of the photoresist remain on the conductive layer 125E as the third protective film 127E. By patterning the third protective film 127E in this manner, the wiring pattern PTE3 is formed.

[0170] When the formation of the wiring pattern PTE3 is completed, the formation of each of the connection wirings 48Ea, 48Ec and the internal conductor 48Eb is started. For example, by performing electrolytic copper plating using a copper sulfate aqueous solution, copper is precipitated on the exposed portion of the conductive layer 125E. As a result, as shown in FIG. 56, a part of each of the connection wirings 48Ea, 48Ec and the internal conductor 48Eb are formed. When a copper sulfate aqueous solution is used in forming each of the connection wirings 48Ea, 48Ec and the internal conductor 48Eb, each of the connection wirings 48Ea, 48Ec and the internal conductor 48Eb contains a small amount of sulfur. When the formation of each of the connection wirings 48Ea, 48Ec and the internal conductor 48Eb is completed, the third protective film 127E is removed by wet etching or the like.

[0171] When the removal of the third protective film 127E is completed, preparations are made to form the remaining portions of the connection wirings 48Ea, 48Ec. For example, a photoresist is applied onto the conductive layer 125E by spin coating. Then, the conductive layer 125E is covered. Then, exposure is performed using an exposure device. As a result, the portions of the photoresist corresponding to the positions where the connection wirings 48Ea, 48Ec are to be formed can be removed by a developing process described later, and the other portions are hardened. Then, as shown in FIG. 57, the portions of the photoresist corresponding to the positions where the connection wirings 48Ea, 48Ec are to be formed are removed by a developing process using a developer. Also, the hardened portions of the photoresist remain on the conductive layer 125E as the fourth protective film 130E. By patterning the fourth protective film 130E in this manner, the wiring pattern PTE4 is formed.

[0172] When the formation of the wiring pattern PTE4 is completed, the remaining portions of the connection wirings 48Ea, 48Ec are formed. For example, by performing electrolytic copper plating using a copper sulfate aqueous solution, copper is precipitated on the portions not covered by the fourth protective film 130E. As a result, the connection wirings 48Ea, 48Ec are formed as shown in FIG. 58. When the connection wirings 48Ea, 48Ec are formed using a copper sulfate aqueous solution, the connection wirings 48Ea, 48Ec contain a small amount of sulfur. When the formation of the connection wirings 48Ea, 48Ec is completed, the fourth protective film 130E is removed by wet etching or the like. At this time, the portions of the conductive layer 125E that are not in contact with the connection wirings 48Ea, 48Ec and the internal conductor 48Eb are removed. As a result, the first external terminals 44Ea to 44Ec are formed.

[0173] When removal of the fourth protective film 130E is completed, the base layer 53 of the size conversion layer 50 is formed. For example, an insulating resin is patterned on the boundary layer 51 by photolithography to form the base layer 53 as shown in Fig. 59. Examples of the insulating resin constituting the base layer 53 include resins such as epoxy resin, polyimide resin, acrylic resin, phenolic resin, and liquid crystal polymer resin, and insulating fillers such as silica.

[0174] When the formation of the base layer 53 is completed, the substrate-side surface layer 52 of the size conversion layer 50 is formed. For example, the substrate-side surface layer 52 can be formed as shown in FIG. 60 by patterning an insulating resin on the base layer 53 by photolithography. In addition, in the substrate-side surface layer 52, through holes 133E are formed at positions where the second external terminals 45Ea, 45Ec are to be formed. When the formation of the substrate-side surface layer 52 is completed, the substrate 100E and the copper layer 110E are removed by grinding as shown in FIG. 61. Then, the process shifts from the process of forming the size conversion layer 50 to the process of forming the cover layer 82 of the passive function layer 80.

[0175] The second magnetic sheet 135E shown in FIG. 62 is pressed from below in the figure. In this case, the cover layer 82 is formed by the second magnetic sheet 135E. Then, the process shifts from the process of forming the cover layer 82 to the process of forming the second external terminals 45Ea, 45Ec. Then, as shown in FIG. 63, the second external terminals 45Ea, 45Ec are formed. In the example shown in FIG. 63, a laminate including a plurality of layers is formed as the second external terminals 45Ea, 45Ec. This completes the surface mount passive component 10E, and thus ends the series of processes constituting the manufacturing method for the surface mount passive component 10E.

[0176] The above manufacturing method is an example of manufacturing the surface mount passive components 10E one by one. However, the manufacturing method of the surface mount passive components 10E is not limited to this. For example, a plurality of surface mount passive components 10E may be manufactured simultaneously by forming portions to become the surface mount passive components 10E in a matrix and then dividing them into individual pieces by dicing or the like.

[0177] Fifteenth embodiment Next, a fifteenth embodiment of a surface mount type passive component will be described with reference to Figures 64 to 72. In the following description, the same reference numerals will be used to designate the same or corresponding members as those in the above embodiments, and duplicated description will be omitted.

[0178] A surface mount passive component 10F of this embodiment is shown in Fig. 64 and Fig. 65. Fig. 64 is a diagram showing a cross section of the surface mount passive component 10F cut in a direction perpendicular to a line LN5 shown by a dashed line in Fig. 65. In Fig. 64, hatching is omitted for ease of understanding.

[0179] The surface mount passive component 10F includes a size conversion section 40F and a passive element 20F mounted on the size conversion section 40F. In this embodiment, the vertical direction in FIG. 64, in which the size conversion section 40F and the passive element 20F are aligned, corresponds to the stacking direction X. Of the main surfaces of the body 21 of the passive element 20F, the upper main surface in the figure, i.e., the top surface, is referred to as the "second main surface 22," and the lower main surface in the figure, i.e., the bottom surface, is referred to as the "first main surface 23." An element external terminal 30 is provided on the first main surface 23.

[0180] The size conversion section 40F includes a size conversion layer 50F and a passive function layer 80F laminated on the size conversion layer 50F. A passive element 20F is mounted on the passive function layer 80F.

[0181] <Passive function layer> The passive functional layer 80F has a main functional layer 81F, a cover layer 82F located on the opposite side of the size converting layer 50F with the main functional layer 81F in between, and a top layer 83F laminated on the cover layer 82F. Of both main surfaces of the main functional layer 81F, the lower surface in Fig. 64 contacts the size converting layer 50F, and the upper surface in Fig. 64 contacts the cover layer 82F.

[0182] In the main functional layer 81F, a plurality of passive function units 200F are provided along a direction perpendicular to the stacking direction X. The passive function units 200F perform at least one of the passive functions of consuming, storing, and discharging the supplied power. For example, the passive function units may be inductors, capacitors, and resistors. The left-right direction in FIG. 64, which is also the direction in which the passive function units 200F are lined up, is called the "parallel direction Y."

[0183] In the examples shown in FIG. 64 and FIG. 65, each passive function unit 200F is an inductor. That is, each passive function unit 200F has an inductor wiring 240F and a lead-out wiring 290F connected to the inductor wiring 240F. The main component of the inductor wiring 240F and the main component of the lead-out wiring 290F are the same conductive material. The conductive material that is the main component of the inductor wiring 240F and the lead-out wiring 290F includes at least one of silver, copper, aluminum, titanium, nickel, and gold, for example. Also, for example, the conductive material that is the main component of the inductor wiring 240F and the lead-out wiring 290F may be an alloy that includes at least two of silver, copper, aluminum, titanium, nickel, and gold.

[0184] The inductor wiring 240F has, for example, a shape as shown below. That is, as shown in Fig. 64, the inductor wiring 240F has a first wiring portion 241 along a first imaginary plane PL1, a second wiring portion 242 along a second imaginary plane PL2, and a connecting wiring portion 243 that electrically connects the first wiring portion 241 and the second wiring portion 242. The first imaginary plane PL1 and the second imaginary plane PL2 are planes that are orthogonal to the stacking direction X. Note that each of the imaginary planes PL1, PL2 does not have to be orthogonal to the stacking direction X as long as it is a plane that intersects with the stacking direction X.

[0185] The second imaginary plane PL2 is disposed between the first imaginary plane PL1 and the size conversion layer 50F in the stacking direction X, and is parallel to the first imaginary plane PL1. That is, the first wiring portion 241 and the second wiring portion 242 are separated from each other in the stacking direction X. The number of turns of the first wiring portion 241 and the second wiring portion 242 is equal to or greater than "1.0 turn". That is, the first wiring portion 241 and the second wiring portion 242 each have a portion that extends in a direction intersecting the stacking direction X. Note that, as long as the passive function portion 200F can function as an inductor, the number of turns of the first wiring portion 241 and the second wiring portion 242 may be less than "1.0 turn".

[0186] Each of the lead-out wirings 290F extends from a connection portion of the inductor wiring 240F with the second wiring portion 242 toward the size conversion layer 50F. Among the principal surfaces of the main functional layer 81F, the principal surface in contact with the size conversion layer 50F is defined as a first functional principal surface 81Fa, and the principal surface in contact with the cover layer 82F is defined as a second functional principal surface 81Fb. In this case, each of the lead-out wirings 290F extends to the first functional principal surface 81Fa. That is, among both ends of each of the lead-out wirings 290F, the end that is not connected to the inductor wiring 240F functions as an external terminal of the passive function unit 200F. The external terminal of the passive function unit 200F is also referred to as a "functional external terminal 300F". In the example shown in FIG. 64 and FIG. 65, each of the passive function units 200F has two functional external terminals 300F. That is, four functional external terminals 300F are arranged on the first functional principal surface 81Fa along the parallel direction Y.

[0187] As will be described in detail later, a magnetic material is present around the inductor wiring 240F. Therefore, when a current is applied to the inductor wiring 240F, a magnetic field is generated by consuming power. Therefore, if a wiring that performs a passive function when a current is applied is defined as a "functional wiring," then the inductor wiring 240F corresponds to the functional wiring.

[0188] As shown in FIG. 65, the main functional layer 81F is provided with a magnetic unit 810 made of a magnetic material. The magnetic unit 810 has a bottom magnetic portion 811 located closer to the size conversion layer 50F than each inductor wiring 240F in the stacking direction X. The bottom magnetic portion 811 is in contact with the size conversion layer 50F. Each of the lead-out wirings 290F penetrates through the bottom magnetic portion 811 in the stacking direction X. The magnetic unit 810 is connected to the bottom magnetic portion 811 and has an annular magnetic portion 812 that is annular and surrounds each of the passive function units 200F from the outside. The tip surface of the annular magnetic portion 812, which is the upper end surface in the figure, is in contact with the cover layer 82F. The magnetic unit 810 is connected to the bottom magnetic portion 811 and has an inner magnetic portion 813 that is disposed inside the inductor wiring 240F. In the example shown in FIG. 65, two inductor wirings 240F are provided. Therefore, two inner magnetic portions 813 are provided along the parallel direction Y. The tip surface, which is the upper end surface in the figure, of each of these inner magnetic portions 813 is in contact with the cover layer 82F. That is, in the recess formed by the bottom magnetic portion 811, the annular magnetic portion 812, and the inner magnetic portion 813, the inductor wiring 240F is disposed.

[0189] Each inductor wiring 240F is provided in the main functional layer 81F while being covered with an insulating covering portion 815. Therefore, each inductor wiring 240F is not in contact with the magnetic portion 810, but the insulating covering portion 815 that covers the inductor wiring 240F is in contact with the magnetic portion 810. The insulating covering portion 815 contains an insulating material such as polyimide resin, acrylic resin, epoxy resin, phenol resin, or liquid crystal polymer.

[0190] The cover layer 82F may be composed of one magnetic layer, or may be a laminate in which a plurality of magnetic layers are laminated in the lamination direction X. The magnetic layer is composed of, for example, a resin containing metal magnetic powder. The magnetic layer constituting the cover layer 82F may contain a material that is not contained in the magnetic portion 810 of the main functional layer 81F.

[0191] The top layer 83F may be composed of one insulating layer, or may be a laminate in which multiple insulating layers are laminated in the lamination direction X. Among the main surfaces of the top layer 83F, the upper surface in FIG. 64, which is the main surface that is not in contact with the cover layer 82F, serves as the element mounting surface 42F of the size conversion section 40F. The element mounting surface 42F is provided with first external terminals 44F in the same number as the element external terminals 30. The first external terminals 44F are electrically connected to the element external terminals 30 via connection parts 60F such as solder.

[0192] In addition, the cover layer 82F is provided with an in-cover layer connection wiring 821 that is a wiring that electrically connects the first external terminal 44F and the inductor wiring 240F. In the cover layer 82F, the same number of in-cover layer connection wirings 821 as the first external terminals 44F are provided. The in-cover layer connection wirings 821 extend in the stacking direction X. That is, the in-cover layer connection wirings 821 penetrate the cover layer 82F in the stacking direction X. In addition, when the wiring that electrically connects the element external terminal 30 of the passive element 20F and the inductor wiring 240F in the passive function layer 80F is defined as the "element element internal connection wiring", the in-cover layer connection wiring 821 corresponds to the element element internal connection wiring.

[0193] <Size conversion layer> The size conversion layer 50F is a laminated body in which a plurality of insulating layers are laminated in the lamination direction X. If the layer in contact with the passive function layer 80F among the insulating layers is defined as the boundary layer 51F, the passive function section 200F is disposed on the surface of the boundary layer 51F. Among the insulating layers constituting the size conversion layer 50F, the layer located on the opposite side of the passive function layer 80F across the boundary layer 51F is defined as the base layer 53F. Among the main surfaces of the base layer 53F, the lower surface in FIG. 64 is the board-side mounting surface 43F. The board-side mounting surface 43F is the surface facing the circuit board CB when the surface-mounted passive component 10F is mounted on the circuit board CB.

[0194] The size conversion layer 50F is provided with second external terminals 45F exposed on the board-side mounting surface 43F. The second external terminals 45F are electrically connected to electrodes of the circuit board CB. In the example shown in Fig. 64 and Fig. 65, two second external terminals 45F are provided. In Fig. 64, the second external terminals 45F are a laminated body in which multiple layers are stacked, but this is not limited thereto. For example, the second external terminals 45F may be formed of a single layer.

[0195] In the size conversion layer 50F, a connection wiring 48F is provided that electrically connects the functional external terminal 300F of the passive function unit 200F and the second external terminal 45F. In the example shown in Fig. 64, two passive function units 200F are provided in the passive function layer 80F. Therefore, two connection wirings 48F are provided in the size conversion layer 50F. In addition, in the size conversion layer 50F, an internal conductor 48Fb that electrically connects the inductor wirings 240F of each passive function unit 200F is provided.

[0196] In addition, in Fig. 65, the outline of the second external terminal 45F when viewed from the stacking direction X is indicated by a two-dot chain line, and the outline of the element external terminal 30 when viewed from the stacking direction X is indicated by a dashed line. As is clear from Fig. 65, the area of ​​the second external terminal 45F on the board-side mounting surface 43F is larger than the area of ​​the element external terminal 30 on the first main surface 23. Furthermore, the total area of ​​each second external terminal 45F on the board-side mounting surface 43F is larger than the total area of ​​each element external terminal 30 on the first main surface 23. In addition, if the area of ​​the passive element 20F when viewed from the stacking direction X is defined as the "size of the passive element 20F" and the area of ​​the size conversion portion 40F when viewed from the stacking direction X is defined as the "size of the size conversion portion 40F", the size of the size conversion portion 40F is larger than the size of the passive element 20F. Moreover, the passive element 20F is disposed inside the periphery of the size conversion portion 40F. That is, the area of ​​the first main surface 23 of the passive element 20F is larger than the area of ​​the element mounting surface 42F of the size conversion portion 40F.

[0197] <Actions and Effects> The operation and effects of this embodiment will be described. (15-1) The component mounted on the circuit board CB, i.e., the surface-mount passive component 10F, can be increased in size without changing the size of the passive component 20F. This prevents the difficulty of mounting the passive component 20F on the circuit board CB from increasing.

[0198] (15-2) The total area of ​​each of the second external terminals 45F is larger than the total area of ​​each of the element external terminals 30. Therefore, it is possible to easily bring the second external terminals 45F into contact with the electrodes of the circuit board CB, compared to the case where the element external terminals 30 are brought into contact with the electrodes of the circuit board CB. This also makes it easier to mount the passive element 20F on the circuit board CB.

[0199] (15-3) In the passive function unit 200F, the inductor wiring 240F and the lead-out wiring 290F have the same main components, which increases the connection reliability between the inductor wiring 240F and the lead-out wiring 290F.

[0200] (15-4) When size converting layer 50F is a laminate of multiple insulating layers, the linear expansion coefficient of each insulating layer can be adjusted by adjusting the type of material contained in each insulating layer, which makes it possible to suppress warping of size converting layer 50F.

[0201] (15-5) The size conversion section 40F has a passive function section 200F. Therefore, a thin passive element 20F can be used as the passive element mounted on the size conversion section 40F. (15-6) The functional external terminals 300F of the passive function unit 200F are in direct contact with the connection wiring 48F in the size conversion layer 50F. Since no solder is interposed between the functional external terminals 300F and the connection wiring 48F, the thickness of the surface-mounted passive component 10F can be reduced.

[0202] (15-7) In the passive function layer 80F, the magnetic portion 810 is provided so as to surround the inductor wiring 240F. This increases the relative permeability, and thus the passive function layer 80F can be made smaller. In addition, the magnetic portion 810 performs a noise suppression function, which enhances the noise suppression effect of the passive function unit 200F.

[0203] (15-8) The passive function unit 200F has two or more wiring layers, which increases the inductance of the passive function layer 80F. (15-9) The number of turns of each connection wiring 48F in the size converting layer 50F is less than "1.0 turn." The definition of "number of turns" here is the same as the number of turns of the inductor wiring described above. This makes it possible to suppress the generation of unnecessary parasitic inductance, parasitic resistance, and parasitic capacitance in the size converting layer 50F.

[0204] <Manufacturing method> Next, an example of a method for manufacturing the above-mentioned surface mount type passive component 10F will be described with reference to Figures 66 to 72. Note that, for the sake of ease of understanding, hatching has also been omitted in Figures 66 to 72.

[0205] First, the passive function layer 80F is formed. That is, as shown in FIG. 66, a conductive layer is formed on the substrate 100F by a conductive material. The substrate 100F is plate-shaped. The substrate 100F includes a magnetic material. That is, the substrate 100F is a magnetic body. In FIG. 66, the upper surface of the substrate 100F is the front surface 101, and the lower surface of the substrate 100F is the back surface 102. As will be described in detail later, the substrate 100F is processed to form a cover layer 82F. In the example shown in FIG. 66, a copper layer 110F is formed as a conductive layer. For example, copper foil is attached to the substrate 100F as the copper layer 110F so as to cover the entire front surface 101. When the formation of the copper layer 110F is completed, the formation of the inductor wiring 240F and the lead wiring 290F is started. For example, the inductor wiring 240F and the lead-out wiring 290F are formed as shown in FIG. 67 by repeating the steps of applying a photoresist, patterning the protective film by exposure using an exposure device, supplying a conductive material by electrolytic copper plating using a copper sulfate aqueous solution, removing the protective film by wet etching, and supplying an insulating material. In the state shown in FIG. 67, the inductor wiring 240F is covered with an insulating material, while the lead-out wiring 290F is not covered with an insulating material. Note that the portion covering the inductor wiring 240F in this state is referred to as an insulating coating layer 115F. A part of the insulating coating layer 115F becomes the insulating coating portion 815.

[0206] Next, a part of the insulating coating layer 115F is removed by a laser or the like. That is, the positions where the annular magnetic portion 812 and the inner magnetic portion 813 of the magnetic portion 810 are to be formed are removed. Then, as shown in FIG. 68, a magnetic material is supplied to the position where the magnetic portion 810 is to be formed. In addition, the magnetic portion 810 is formed by grinding the portion where the magnetic material is supplied and the portion where the conductive material is supplied. This completes the formation of the passive function layer 80F.

[0207] Then, the size conversion layer 50F is formed. For example, by applying a photoresist, patterning the protective film by exposure using an exposure device, supplying a conductive material by electrolytic copper plating using a copper sulfate aqueous solution, and removing the protective film by wet etching, the connection wirings 48F in contact with the lead-out wiring 290F and the internal conductors 48Fb in contact with the lead-out wiring 290F are formed as shown in FIG. 69. Then, by supplying an insulating material, the boundary layer 51F is formed as shown in FIG. 69. When the formation of the boundary layer 51F is completed, the remaining parts of the connection wirings 48F and the remaining parts of the internal conductors 48Fb are formed. For example, by applying a photoresist, patterning the protective film by exposure using an exposure device, supplying a conductive material by electrolytic copper plating using a copper sulfate aqueous solution, and removing the protective film by wet etching, the remaining parts of the connection wirings 48F and the remaining parts of the internal conductors 48Fb can be formed as shown in FIG. 69. When the connection wirings 48F and the internal conductors 48Fb are formed in this manner, the base layer 53F is formed. For example, the base layer 53F can be formed by supplying an insulating material around the connection wirings 48F and the internal conductors 48Fb. Then, in the base layer 53F, a through hole 117F is formed by a laser or the like in a portion that connects the connection wirings 48F and the second external terminal 45F. This forms the size conversion layer 50F.

[0208] 70, the inner-cover-layer connection wiring 821 is formed in the cover layer 82F, which is the substrate 100F, by, for example, filling plating. That is, a via 119F is formed in the cover layer 82F at a position where the inner-cover-layer connection wiring 821 is to be formed, by using a laser or the like. Then, the inner-cover-layer connection wiring 821 is formed by plating copper in the via 119F.

[0209] When the formation of the inner cover layer connection wiring 821 is completed, the top layer 83F is formed. For example, the top layer 83F can be formed by supplying an insulating material onto the cover layer 82F. At this time, in the top layer 83F, through holes 120F are formed at the formation positions of the second external terminals 45F. Then, as shown in FIG. 71, each second external terminal 45F is formed. In the example shown in FIG. 71, a laminate including a plurality of layers is formed as the second external terminal 45F. Then, each first external terminal 44F is formed. In the example shown in FIG. 71, a laminate including a plurality of layers is formed as the first external terminal 44F. This completes the formation of the size conversion section 40F. When the size conversion section 40F is formed in this way, a passive element 20F is mounted on the size conversion section 40F. That is, as shown in FIG. 72, a connection section 60F such as solder is attached to each second external terminal 45F of the size conversion section 40F. Then, the passive element 20F is mounted on the size conversion portion 40F by bringing the element external terminal 30 into contact with the connection portion 60F. This completes the surface mount type passive component 10F, thereby completing a series of steps constituting the manufacturing method for the surface mount type passive component 10F.

[0210] The above manufacturing method is an example of manufacturing the surface mount passive components 10F one by one. However, the manufacturing method of the surface mount passive components 10F is not limited to this. For example, a plurality of surface mount passive components 10F may be manufactured simultaneously by forming portions to become a plurality of size conversion sections 40F in a matrix and then dividing them into individual pieces by dicing or the like.

[0211] Sixteenth embodiment Next, a surface mount type passive component according to a sixteenth embodiment will be described with reference to Figures 73 and 74. In the following description, differences from the fifteenth embodiment will be mainly described, and the same reference numerals will be used to designate the same or corresponding components as those in the above embodiments, and duplicated description will be omitted.

[0212] As shown in FIG. 73, the surface mount passive component 10F1 of this embodiment includes a sealing portion 65F1 that seals the passive element 20F. The sealing portion 65F1 includes a sealing resin. For example, a molding material, an undercoat material, or an underfill material can be used as the sealing resin. Specifically, a material including a resin such as an epoxy resin, a polyimide resin, an acrylic resin, a phenolic resin, or a liquid crystal polymer-based resin, and an insulating filler such as silica can be used as the sealing resin. In the example shown in FIG. 73, the second main surface 22 of the passive element 20F is also covered with the sealing portion 65F1. This can increase the strength of the surface mount passive component 10F1.

[0213] The resin-sealing configuration of the passive element 20F is not limited to that shown in Fig. 73. For example, as shown in Fig. 74, a surface-mount passive component 10F1 may be provided with a sealing portion 65F1 that does not cover the second main surface 22 of the passive element 20F.

[0214] (Example of change) The above-described embodiments may be modified as follows: The above-described embodiments and the following modifications may be combined with each other to the extent that no technical contradiction occurs.

[0215] In the fifteenth embodiment, the passive element 20F may be disposed at a position different from the end of the size conversion section 40F in the first direction in the parallel direction Y. For example, as shown in FIG. 75, the passive element 20F may be disposed at the center of the size conversion section 40F in the parallel direction Y. In this case, the second external terminal 45F connected to the element external terminal 30 and the connection wiring 821 in the cover layer are shifted from each other in the parallel direction Y. Therefore, as shown in FIG. 75, it is preferable to provide a wiring 68F in the top layer 83F of the size conversion section 40F that electrically connects the second external terminal 45F and the connection wiring 821 in the cover layer.

[0216] In the fifteenth embodiment, a plurality of passive elements may be disposed on the element mounting surface 42F of the size conversion section 40F. In the fifteenth embodiment, the passive function unit 200F has two layers of inductor wiring 240F, but the inductor wiring 240F of the passive function unit 200F may be provided with three or more layers of inductor wiring. Also, the inductor wiring 240F of the passive function unit 200F may be provided with a single layer of inductor wiring.

[0217] In the fifteenth embodiment, the passive function layer 80F may be provided with three or more passive function units 200F. In this case, any of the passive function units 200F may be an inductor, any of the passive function units 200F may be a resistor, or any of the passive function units 200F may be a capacitor. The passive functions of the passive function units 200F may be different from each other.

[0218] In the fifteenth embodiment, the inductor wiring 240F may be in contact with a magnetic material in the passive function layer 80F. For example, the insulating coating portion 815 may not be provided in the passive function layer 80F. In this case, the entire inductor wiring 240F comes in contact with the magnetic material.

[0219] In the fifteenth embodiment, the element external terminal 30 of the passive element 20F and the second external terminal 45F may be directly connected. In the fifteenth embodiment, the surface mount type passive component may have a configuration in which another passive element is mounted on the passive element 20F.

[0220] In the fourteenth, fifteenth and sixteenth embodiments, the passive function unit may be a capacitor or a resistor. In the sixth, seventh and eighth embodiments, the size of some of the second passive elements of the second passive element 20C2 may be different from the size of other second passive elements. The thickness of some of the second passive elements of the second passive element 20C2 may be different from the thickness of other second passive elements.

[0221] In each embodiment, when a plurality of passive elements are mounted on the element mounting surface, the area of ​​the first principal surfaces of some of the passive elements may be different from the area of ​​the first principal surfaces of the remaining passive elements.

[0222] The thickness of the size conversion section may be equal to the thickness of the passive element, or may be greater than the thickness of the passive element. In the first embodiment, the size conversion section 40 may be configured to have only one of the dummy internal conductors 47 and the dummy external terminals 46 as the dummy conductors.

[0223] In the first embodiment, the connection wiring that electrically connects the first external terminal 44 and the second external terminal 45 may have a conductor exposed on the main surface of the main body 21 . In the first embodiment, a resistor may be mounted on the element mounting surface 42 as the passive element 20. In this case, the DC electrical resistance of the minimum spacing portion of the size conversion section 40 may be set to be "1000 times" or more the DC electrical resistance of the resistor (passive element 20) mounted on the element mounting surface 42.

[0224] When multiple passive elements are mounted on the element mounting surface, the distance between adjacent passive elements may be 500 μm or more. Furthermore, if it is possible to prevent short circuits between the conductors of the passive elements, the distance may be less than 10 μm. For example, adjacent passive elements may be in contact with each other.

[0225] In the embodiment, the area of ​​some of the second external terminals among the plurality of second external terminals may be equal to or smaller than the area of ​​the element external terminal (largest element external terminal). In the fifth embodiment, the sealing portion 65B1 does not contact the second main surface 22 of each of the passive elements 20A1 and 20A2, but this is not limited to the above. For example, the sealing portion 65B1 may be in contact with a portion of the second main surface 22 of the passive element 20A1, while the sealing portion 65B1 may not be in contact with the remaining portion. Also, for example, the sealing portion 65B1 may be in contact with a portion of the second main surface 22 of the passive element 20A2, while the sealing portion 65B1 may not be in contact with the remaining portion.

[0226] For example, a passive component 20AR as shown in FIG. 76 may be mounted on the size conversion unit. The passive component 20AR is an array component in which a plurality of passive elements 20G are arranged. When each passive element 20G is an inductor, each passive component 20AR includes an inductor wiring 24G that generates an inductance and a vertical wiring 29 that is connected to the inductor wiring 24G and extends from the connection portion to the external terminal 30 for the element. Even in this case, it is preferable to make the area of ​​the substrate-side mounting surface of the size conversion unit larger than the area of ​​the first main surface of one passive element 20G. When the passive component 20AR has two passive elements 20G as shown in FIG. 76, half of the area of ​​the main surface 23AR of the passive component 20AR can be regarded as the main surface of one passive element 20G.

[0227] In each of the above embodiments, the external terminals for the element are exposed to the first main surface, but are not exposed to a non-main surface of the body connected to the first main surface. However, this is not limited thereto. For example, the external terminals for the element may be exposed across the first main surface and the non-main surface of the body connected to the first main surface. In this case, the area of ​​the external terminals for the element on the first main surface refers to the area of ​​the portion of the external terminals for the element exposed to the first main surface.

[0228] In each of the above embodiments, the first external terminal is exposed on the element mounting surface of the element body of the size conversion section, but is not exposed on a non-principal surface of the element body connected to the element mounting surface. However, this is not limited to this. For example, the first external terminal may be exposed across the element mounting surface and the non-principal surface of the element body connected to the element mounting surface. In this case, the area of ​​the first external terminal on the element mounting surface refers to the area of ​​the portion of the first external terminal exposed on the element mounting surface.

[0229] In each of the above embodiments, the second external terminal is exposed on the substrate-side mounting surface of the element body of the size conversion unit, but is not exposed on a non-main surface of the element body connected to the substrate-side mounting surface. However, this is not limited to this. For example, the second external terminal may be exposed across the substrate-side mounting surface and the non-main surface of the element body connected to the substrate-side mounting surface. In this case, the area of ​​the second external terminal on the substrate-side mounting surface refers to the area of ​​the portion of the second external terminal exposed on the substrate-side mounting surface.

[0230] In the first embodiment, the position of the first external terminal 44 may be shifted from the position of the second external terminal 45 in the direction perpendicular to the stacking direction X. In this case, the connection wiring 48 as shown in FIG. 77 may be provided in the element body 41 of the size conversion unit 40. That is, the connection wiring 48 has a planar connection wiring 483 arranged on a predetermined plane PL3. The predetermined plane PL3 is an imaginary plane located between the board-side mounting surface 43 and the element mounting surface 42 in the stacking direction X. The predetermined plane PL3 is preferably a plane parallel to the board-side mounting surface 43 as shown in FIG. 77, but the predetermined plane PL3 does not have to be a plane parallel to the board-side mounting surface 43. In addition, the connection wiring 48 has a first connecting wiring portion 481 that connects the first external terminal 44 and the planar connection wiring 483, and a second connecting wiring portion 482 that connects the second external terminal 45 and the planar connection wiring 483. As a result, even if the position of the first external terminal 44 is misaligned from the position of the second external terminal 45 in the direction perpendicular to the stacking direction X, the first external terminal 44 and the second external terminal 45 can be electrically connected.

[0231] In addition, on the predetermined plane PL3, it is preferable that the number of turns of the planar connection wiring 483 is less than "1.0 turn." This makes it possible to prevent the line length of the connection wiring 48 from becoming long, and thus to prevent an increase in parasitic resistance caused by the connection wiring 48.

[0232] More preferably, the plane connecting wiring 483 is formed so as to connect the first connecting wiring portion 481 and the second connecting wiring portion 482 by the shortest path. That is, by forming the plane connecting wiring 483 in a straight line, the line length of the plane connecting wiring 483 can be minimized.

[0233] Here, in the predetermined plane PL3, one of two mutually orthogonal directions is defined as a first direction Y11, and the other direction is defined as a second direction Y12. FIG. 78 shows an example of a cross-sectional view of the size conversion unit 40 when the plane connection wiring 483 is cut in a direction orthogonal to the stacking direction X. As shown in FIG. 78, the position of the first external terminal 44 may be shifted from the position of the second external terminal 45 in the first direction Y11 and may be shifted from the position of the second external terminal 45 in the second direction Y12. In such a case, the plane connection wiring 483 may have a shape as shown in FIG. 78. That is, the plane connection wiring 483 includes a first wiring portion 483a connected to the first connecting wiring portion 481 and a second wiring portion 483b connecting the first wiring portion 483a and the second connecting wiring portion 482. The first wiring portion 483a is a linear wiring extending in the first direction Y11. That is, the first wiring portion 483a is a linear connection wiring extending from the first external terminal 44 toward the second external terminal 45 in a direction not far from the second external terminal 45. In the example shown in FIG. 78, the second wiring portion 483b extends in a straight line from the connection portion with the first wiring portion 483a toward the connection portion with the second coupling wiring portion 482. Even in this case, it can be said that the first external terminal 44 and the second external terminal 45 are electrically connected via the shortest path in a broad sense. Note that the second wiring portion 483b may have, for example, an arc-shaped shape.

[0234] The size conversion part may be manufactured by a manufacturing method other than the semi-additive method. For example, the size conversion part may be manufactured by a sheet lamination method, a print lamination method, or the like. [Explanation of symbols]

[0235] 10, 10A, 10B, 10B1, 10B2, 10C, 10C1 to 10C4, 10E, 10F, 10F1... Surface mount passive components 20, 20A1, 20A2, 20F, 20G...passive elements 20C1...first passive element 20C2~20C4...Second passive element 20AR…Passive components 21, 21C3…Main unit 22,22C1,22C2,22C3,22C4...2nd main surface 23,23C1~23C4…1st main surface 23AR…main surface 24,24G…Inductor wiring 24C3…Wiring section 29…Vertical wiring 30...External terminal for element 30C11…External terminal for first element 30C12…External terminal for second element 30C21, 30C31...External terminals for elements 30C32…Dummy terminal 30C41…External terminal for element 40, 40A, 40B, 40E, 40F...Size conversion section 41, 41A, 41B...Base 42, 42E, 42F…Device mounting surface 42a…Minimum interval part 43, 43E, 43F…Board side mounting surface 44, 44B, 44Ea~44Ec, 44F…First external terminal 45, 45Ea, 45Ec, 45F...Second external terminal 46...Dummy external terminal 47…Dummy inner conductor 48, 48A1~48A3, 48Ea, 48Ec, 48F...Connection wiring 481...1st connection wiring section 482…Second connection wiring section 483…Flat connection wiring 483a...1st wiring section 483b…Second wiring section 48Eb, 48Fb…Inner conductor 50,50F…Size conversion layer 51,51F…boundary layer 52…Substrate side surface layer 53,53F: Base layer 60, 60C11, 60C12, 60C42, 60F... Connections 65,65B1,65C1,65C2,65F1...Sealing part 65a…Top 65b…Thickness change part 66…Depression 67C41…First sealing part 67C42…Second sealing part 68F…Wiring 70C421…First connection wire 70C422…Second connection wiring 70C423…Connection wiring 80,80F: Passive functional layer 81…Main function layer 81a…First functional surface 81b…Second functional surface 81F: Main function layer 81Fa…First functional surface 81Fb…Second functional surface 82…Cover layer 82F…Cover layer 83F…Top floor 200,200F…Passive function part 211...Non-main surface 240,240F…Inductor wiring 241...1st wiring section 242…Second wiring section 243...Connection wiring section 290…Exit wiring 290F…Exit wiring 300,300F…Function external terminal 810...Magnetic part 811…Bottom magnetic part 812...Circular magnetic part 813…Inner magnetic part 815…Insulating coating 821…Cover layer internal connection wiring CB: Circuit board LY1: First mounting layer LY2: Second mounting layer PL1: First virtual plane PL2: Second virtual plane PL3…Predetermined plane Z0…Predetermined axis line

Claims

1. a passive element having a first main surface and a second main surface located opposite to the first main surface, the first main surface having a plurality of external terminals for the element exposed thereon; A size conversion unit on which the passive element is mounted, the passive element is mounted on the size conversion portion such that the first main surface is located closer to the size conversion portion than the second main surface; The size conversion unit is an element body having an element mounting surface which is a main surface on which the passive element is mounted, and a substrate side mounting surface which is a main surface located on the opposite side to the element mounting surface; a plurality of first external terminals exposed on the element mounting surface and electrically connected to corresponding external terminals among the plurality of external terminals for elements; a plurality of second external terminals exposed on the substrate mounting surface; a connection wiring electrically connecting the first external terminal and the second external terminal, an area of ​​the substrate-side mounting surface is larger than an area of ​​the first main surface, and a total area of ​​the second external terminals on the substrate-side mounting surface is larger than a total area of ​​the element external terminals on the first main surface; a distance between the substrate mounting surface and the element mounting surface of the size conversion portion is narrower than a distance between the first main surface and the second main surface of the passive element, Further comprising a second passive element mounted on the passive element; When a direction in which the size conversion unit, the passive element, and the second passive element are arranged is defined as a stacking direction, a portion in which the passive element is located in the stacking direction is defined as a first mounting layer, a portion in which the second passive element is located in the stacking direction is defined as a second mounting layer, and a virtual line extending in the stacking direction and passing through the center of gravity of the size conversion unit is defined as a predetermined axis, The predetermined axis does not pass through both the center of gravity of the first mounting layer and the center of gravity of the second mounting layer. Surface mount passive components.

2. A plurality of the passive elements are provided, The areas of the first main surfaces of the plurality of passive elements are the same.

2. The surface mount type passive component according to claim 1.

3. a plurality of the second passive elements; Among the main surfaces of the plurality of second passive elements, the main surfaces located on the passive element side have the same area.

3. The surface mount type passive component according to claim 1 or 2.

4. A sealing portion including a sealing resin is provided. The sealing portion seals both the passive element and the second passive element.

4. The surface mount type passive component according to claim 1.

5. Within the sealing portion, wiring is provided that electrically connects an external terminal for an element exposed on the second main surface of the passive element and an external terminal of the second passive element.

5. The surface mount type passive component according to claim 4.

6. A plurality of the passive elements are provided, Within the sealing portion, wiring is provided to electrically connect the element external terminals exposed on the second main surface of the passive elements adjacent to each other.

6. The surface mount type passive component according to claim 4 or 5.

7. The passive element is an inductor.

7. The surface mount type passive component according to claim 1.

8. a passive member is mounted on the element mounting surface, the passive component is an array component in which a plurality of the passive elements are arranged, The plurality of passive elements include an inductor wiring that generates an inductance, and a vertical wiring that is connected to the inductor wiring and extends from the connection portion to the external terminal for the element.

8. The surface mount type passive component according to claim 7.

Images