JP3405145B2 - Multilayer electronic components with built-in coil - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated electronic component with a built-in coil, and more particularly to a laminated electronic component with a built-in coil used in a high-frequency electronic device or the like. 2. Description of the Related Art Conventionally, a laminated inductor shown in FIG. 9 has been known as this kind of electronic component. In the laminated inductor 81, a plurality of insulating sheets 83 each having a coil conductor 82 provided on the surface thereof are laminated, and a plurality of dimension adjusting sheets 87, 8 are respectively provided on both left and right sides thereof.
8 and protective sheets 84, 85, etc. are arranged, laminated, and fired. The coil conductors 82 are electrically connected in series via a relay via hole 86 provided in the insulating sheet 83 to form a spiral coil 90.
As shown in FIG. 10, both ends of the spiral coil 90 are connected to the left and right ends of the laminated inductor 81 through the via holes 89 provided in the dimension adjustment sheets 87 and 88 and the protection sheets 84 and 85, respectively. It is connected to input / output external electrodes 91 and 92 provided in the section. The input / output external electrodes 91 and 92 are perpendicular to the axial direction of the coil 90 and the stacking direction of the sheets 83 to 85, 87 and 88 in order to reduce stray capacitance and improve insertion loss characteristics in a high frequency range. . [0003] However, FIG.
As shown in FIG. 7, in the case of the conventional laminated inductor 81, the coil conductor 82 is disposed substantially at the center of the inductor 81 in the laminating direction, so that the coil conductor 82 and the insulating sheet 83 are formed at the center of the inductor 81. The contact area increases. However, since the adhesion strength between the coil conductor 82 and the insulating sheet 83 is generally weak, the mechanical strength of the inductor 81 is low in the central portion where the contact area between the coil conductor 82 and the insulating sheet 83 is large. Therefore, when the inductor 81 is surface-mounted on a printed circuit board or the like using an automatic mounting machine, when the suction nozzle of the automatic mounting machine sucks the inductor 81 or when the inductor 81 is mounted on a printed circuit board or the like, An external force F is applied to the center of the inductor 81 in a direction perpendicular to the laminating direction of the sheets 83 to 85 (see FIG. 10), and the center of the inductor 81 is broken between the coil conductor 82 and the insulating sheet 83. There was a risk of peeling. As a countermeasure, if the diameter of the spiral coil is reduced in order to reduce the contact area between the coil conductor 82 and the insulating sheet 83, the inductance L decreases.
Therefore, if the number of turns of the spiral coil is increased to compensate for the decrease in the inductance L, the number of the insulating sheets 83 increases, which causes a new problem that the manufacturing cost increases. Alternatively, if the pattern width of the coil conductor 82 is reduced in order to reduce the contact area between the coil conductor 82 and the insulating sheet 83, the DC resistance value of the coil conductor 82 increases and the efficiency of the inductor 81 deteriorates. I do. SUMMARY OF THE INVENTION It is an object of the present invention to provide a coil built-in electronic component having high mechanical strength without increasing the manufacturing cost or deteriorating efficiency. In order to achieve the above object, a laminated electronic component with a built-in coil according to the present invention comprises (a)
A laminated body including at least one spiral coil formed by laminating a plurality of inner conductors and a plurality of insulating layers and electrically connecting the inner conductors; and (b) the laminated body connected to the coil and An input / output external electrode disposed on both end surfaces of the laminate in a state perpendicular to the stacking direction of the body and the axial direction of the coil, and (c) the internal conductor is formed of the laminate. It is characterized by being disposed at at least one end of both ends excluding the center. With the above construction, the central portion of the laminate is removed,
Since the inner conductor is disposed at at least one end of both ends, contact between the inner conductor and the insulating layer is reduced at the center of the laminate, and even when external force is applied in a direction perpendicular to the lamination direction, Problems such as cracking and peeling of the laminate are less likely to occur. An embodiment of a laminated electronic component with a built-in coil according to the present invention will be described below with reference to the accompanying drawings. In each embodiment, the same reference numerals are given to the same parts and the same components. [First Embodiment, FIGS. 1 to 3] As shown in FIG. 1, a laminated inductor 1 includes an insulating sheet 3 provided with a coil conductor 2 and a relay via hole (opening) 6, and a lead via hole. (Openings) 9 are provided with the dimension adjusting sheet 7 and the protective sheets 4, 5 and the like provided respectively. The coil conductors 2 are electrically connected in series via the relay via holes 6 to form a spiral coil 10.
The coil conductor 2 is made of Ag, Pd, Ag-Pd, Cu, or the like, and is formed on the surface of the sheet 3 by a known printing method, a sputtering method, a vacuum evaporation method, or the like. The insulating rectangular sheets 3, 4, 5, and 7 are formed by kneading a magnetic powder such as a nonmagnetic ceramic powder or a ferrite together with a binder or the like into a sheet shape. These sheets 3, 4, 5, and 7 are formed by laminating a plurality of insulating sheets 3 and laminating a plurality of sheets 7 for dimension adjustment having a predetermined thickness on the right side. After arranging the protection sheets 4 and 5 on both sides respectively, they are integrally sintered to form a laminate. Next, as shown in FIG. 2, an input external electrode 16 and an output external electrode 17 are formed on both left and right end surfaces of the laminated body 12, respectively. These electrodes 16 and 17 are formed by a method such as a sputtering method, a vacuum evaporation method, or a coating and baking method. The input external electrode 16 is electrically connected to one end of the coil 10 via a lead-out via hole 9 provided in the protection sheet 4. The output external electrode 17 is
The coil 10 is electrically connected to the other end of the coil 10 via a draw-out via hole 9 provided in each of the dimension adjusting sheet 7 and the protective sheet 5. The multilayer inductor 1 thus obtained is:
The stacking direction of the sheets 3 to 5, 7 is the input / output external electrode 1.
6 and 17, and the axial direction of the coil 10 is perpendicular to the input / output external electrodes 16 and 17. As shown in FIG. 3, the coil conductor 2 is disposed on the left end of the laminate 12 by the thickness of the dimension adjusting sheet 7, and when the suction nozzle of the automatic mounting machine sucks the inductor 1. Alternatively, when the inductor 1 is mounted on a printed circuit board or the like, it is not disposed at the center of the laminated body 12 where external force is likely to be applied and peeling is likely to occur. Therefore, the contact between the coil conductor 2 and the sheets 3 and 7 is reduced at the center of the laminated body 12, and even if an external force is applied in a direction perpendicular to the laminating direction of the sheets 3 to 5 and 7, the inductor 1 peels Inconveniences such as cracks and cracks are unlikely to occur. As a result, it is possible to obtain the multilayer inductor 1 having high mechanical strength without increasing the manufacturing cost or deteriorating the efficiency. [Second Embodiment, FIGS. 4 and 5] As shown in FIG. 4, the multilayer inductor 21 has two coil portions 3
0 and 31 are built-in. Multilayer inductor 21
Is composed of an insulating sheet 3 provided with the coil conductor 2 and the relay via hole 6, protective sheets 4 and 5 provided with the lead-out via holes 9, respectively, a dimension adjusting sheet 27 provided with the relay via hole 6, and the like. ing. Coil conductor 2
Are electrically connected in series via the relay via hole 6 to form two coil portions 30 and 31 respectively.
The two coil portions 30 and 31 are electrically connected in series via the relay via hole 6 provided in the dimension adjusting sheet 27. These sheets 3 to 5, 27 are formed by laminating a plurality of dimension adjusting sheets 27 having a predetermined thickness, and by laminating a plurality of insulating sheets 3 on the left and right sides thereof. To protect sheet 4, respectively
After arranging 5, it is integrally sintered to form a laminate. Next, as shown in FIG. 5, an input external electrode 36 and an output external electrode 37 are formed on both left and right end surfaces of the laminate 32, respectively. The input external electrode 36 is electrically connected to one end of the coil unit 30 via a lead-out via hole 9 provided in the protection sheet 4. The output external electrode 37 is electrically connected to one end of the coil portion 31 via the lead-out via hole 9 provided in the protection sheet 5. The multilayer inductor 21 having the above configuration
Since the coil conductors 2 are disposed at the left and right ends of the laminated body 32 except for the central part of the laminated body 32, the external force is applied in a direction perpendicular to the laminating direction of the sheets 3 to 5, 27. Even if added, the inductor 21 is unlikely to cause problems such as peeling and cracking. Also, the coil portions 30, 3 of the inductor 21
In the case where the combined inductance of the coils 1 and 2 is equal to the inductance of the inductor 1 of the first embodiment, the number of the coil conductors 2 constituting the coil units 30 and 31 is larger than the number of the coil conductors 2 constituting the coil 10. There is an advantage that the Q of the inductor 21 is better than the Q of the inductor 1. Further, by arranging the coil conductors 2 on both right and left ends of the multilayer body 32 like the inductor 21, in the case of the same inductance, the number of the coil conductors 2 in the coil conductor densely located portion in the multilayer body is: The inductor 21 is the same as the inductor 1 of the first embodiment.
The contact area between the coil conductor and the insulating layer in the densely packed coil conductor area is reduced by that amount, and the mechanical strength of the inductor 21 is increased. [Third Embodiment, FIGS. 6 and 7] The third embodiment will be described by taking a laminated LC component as an example. As shown in FIG. 6, the laminated LC component 41 includes an insulating sheet 3 provided with a coil conductor 2 and a relay via hole 6, protective sheets 4 and 5 provided with a lead-out via hole 9, and a relay via hole 6, respectively. Provided dimension adjusting sheet 47, capacitor conductor 49a (or 49b) and relay via hole 6
And a dielectric sheet 48 or the like. The coil conductor 2 is electrically connected in series via the relay via hole 6 to form the coil 50. Dielectric sheet 48
Opposing capacitor conductors 49a and 49b
Form a capacitor 51. One end of the coil 50 is electrically connected to one capacitor conductor 49a of the capacitor 51 via the relay via hole 6 provided in the dimension adjusting sheet 47 and the dielectric sheet 48, respectively. That is, the coil 50 and the capacitor 51 constitute an LC series resonance circuit. These sheets 3 to 5, 47 and 48 are formed by laminating a plurality of or dimensionally adjusting sheets 47 having a predetermined thickness, laminating a plurality of insulating sheets 3 on the left side thereof, and forming a plurality of sheets on the right side thereof. Laminated two dielectric sheets 48,
Further, after the protective sheets 4 and 5 are respectively disposed on the left and right sides thereof, they are integrally sintered to form a laminate. Next, as shown in FIG. 7, an input external electrode 56 and an output external electrode 57 are formed on both left and right end surfaces of the laminate 52, respectively. The input external electrode 56 is connected to the coil 5 through a lead-out via hole 9 provided in the protection sheet 4.
0 is electrically connected to the other end. The output external electrode 57 is connected to the lead-out via hole 9 provided in the protection sheet 5.
Through the other capacitor conductor 49 of the capacitor 51
b. The laminated LC component 41 having the above structure
Since the coil conductor 2 is disposed at the left end of the laminate 52 and the capacitor conductors 49a and 49b are disposed at the right end of the laminate 52, the external force is reduced in the direction in which the sheets 3 to 5, 47, and 48 are laminated. The LC component 41 is unlikely to cause problems such as peeling and cracking even if it is applied in a direction perpendicular to the direction. As a result, a laminated LC component 41 having high mechanical strength can be obtained. [Other Embodiments] The laminated electronic component with a built-in coil according to the present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the gist. In the first and third embodiments, the coil is provided on the input external electrode side of the laminate, but may be provided on the output external electrode side. In the above-described embodiment, the via hole is used as the electrical connection means between the input / output external electrode and the internal conductor. However, the present invention is not limited to this. For example, FIG.
As shown in FIG.
Instead of this, a lead-out conductor 61 is formed, and a lead-out conductor 62 in which the relay via hole 6 is provided at one end is formed in the dimension adjustment sheet 7 of the outermost layer. Leader conductor 6
The other ends of the sheets 1 and 62 are exposed on the lower sides of the sheets 4 and 7. Then, these lead-out conductors 61 and 62 are connected to the folded portions of the input / output external electrodes 16 and 17 on the bottom surface of the laminated body 12 so that the coil conductor 6 and the input / output external electrodes 16 and 17 are connected.
17 may be electrically connected. Further, in the above embodiment, the insulating sheets on which the internal conductors are formed are stacked and then integrally fired, but the invention is not necessarily limited to this.
The sheet which has been sintered in advance may be used. Further, a laminated electronic component with a built-in coil may be manufactured by a manufacturing method described below. After an insulating layer is formed from a paste-like insulating material by a method such as printing, a paste-like conductor material is applied to the surface of the insulating layer to form a coil conductor having an arbitrary shape. Next, a paste-like insulating material is applied from above the coil conductor to form an insulating layer. Similarly, an electronic component having a laminated structure can be obtained by successively applying layers. As is apparent from the above description, according to the present invention, the central portion of the laminate is removed and the internal conductor is provided at at least one of the two ends. The contact between the inner conductor and the insulating layer is reduced at the center of the laminate,
Even when an external force is applied in a direction perpendicular to the laminating direction, problems such as cracking and peeling of the laminated body are less likely to occur. As a result, a laminated electronic component with a built-in coil having high mechanical strength can be obtained without increasing the manufacturing cost or deteriorating the efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a first example of a laminated electronic component with a built-in coil according to the present invention.
FIG. 2 is an exploded perspective view showing the embodiment. FIG. 2 is an external perspective view of the multilayer electronic component with a built-in coil shown in FIG. 1; FIG. 3 is a cross-sectional view illustrating the structure of the coil-embedded multilayer electronic component shown in FIG. 2; FIG. 4 is a second view of the laminated electronic component with a built-in coil according to the present invention.
FIG. 2 is an exploded perspective view showing the embodiment. FIG. 5 is a cross-sectional view for explaining the structure of the multilayer electronic component with a built-in coil shown in FIG. 4; FIG. 6 is a third view of the laminated electronic component with a built-in coil according to the present invention;
FIG. 2 is an exploded perspective view showing the embodiment. FIG. 7 is a cross-sectional view for explaining the structure of the coil-embedded multilayer electronic component shown in FIG. FIG. 8 is an exploded perspective view showing a modified example of the multilayer electronic component with a built-in coil shown in FIG. 1; FIG. 9 is an exploded perspective view showing a conventional laminated electronic component with a built-in coil. 10 is an external perspective view of the multilayer electronic component with a built-in coil shown in FIG. 9; 11 is a cross-sectional view for explaining the structure of the multilayer electronic component with a built-in coil shown in FIG. DESCRIPTION OF SYMBOLS 1 ... Laminated inductor 2 ... Coil conductor 3 ... Insulating sheet 4,5 ... Protective sheet 7 ... Dimension adjusting sheet 12 ... Laminated body 16, 17 ... I / O external electrode 21 ... Laminated inductor 27 ... Size adjustment sheets 30, 31. Coil section 32... Laminated bodies 36, 37... I / O external electrodes 41... LC electronic components 47. Capacitor 52: laminated body 56, 57: input / output external electrode

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01F 17/00 H01F 27/29

Claims (1)

(57) [Claim 1] A lamination in which a plurality of internal conductors and a plurality of insulating layers are laminated, and at least one spiral coil formed by electrically connecting the internal conductors is built-in. And an input / output external electrode connected to the coil and arranged on both end faces of the laminate in a state perpendicular to the lamination direction of the laminate and the axial direction of the coil, The laminated electronic component with a built-in coil, characterized in that the internal conductor is disposed at at least one end of both ends of the laminated body except for the center part.