JP5008926B2 - Multilayer inductor and method of adjusting inductance of multilayer inductor - Google Patents

Description

  The present invention relates to a multilayer inductor and an inductance adjustment method for the multilayer inductor.

  Multilayer inductors having the same size and different inductances are required according to customer requirements. Therefore, in order to adjust the inductance while ensuring the Q value indicating the quality of the inductor, conventionally, a laminated body in which a plurality of insulating layers are laminated, and the first and second external parts disposed on the outer surface of the laminated body. An electrode, and a first conductor and a second conductor disposed in the stack in the stacking direction of the plurality of insulating layers and connected in series between the first external electrode and the second external electrode. The first conductor portion has one end of each of the five start end side conductor patterns constituting the start end side portion of the coil loop electrically connected to the first external electrode and the other end electrically connected to each other. The second conductor portion is configured such that one end of each of the five termination-side conductor patterns constituting the termination-side portion of the coil loop is electrically connected to the second external electrode and the other ends are mutually connected. Constructed by electrical connection, starting end side conductor pattern and termination Coil diameter is known layered inductor different from the coil diameter at the other conductor patterns in at least one conductor patterns of the conductor pattern (e.g., see Patent Document 1).

In the multilayer inductor described in Patent Document 1, a multiple winding coil in which a starting end side conductor pattern and a terminating end conductor pattern are connected in parallel is configured to reduce DC resistance, thereby securing a Q value. Yes. In this multilayer inductor, the inductance is adjusted by partially changing the cross-sectional area of the magnetic path so that the coil diameter in at least one conductor pattern is different from the coil diameter in the other conductor pattern. .
Japanese Patent Laid-Open No. 11-273554

  However, in the multilayer inductor described in Patent Document 1, since the inductance is adjusted by changing the coil diameter, the conductor pattern constituting the first conductor part or the conductor constituting the second conductor part. It was necessary to form a conductor pattern of a different type from the pattern on the insulating layer. Therefore, there has been a problem that variations in the shape of the conductor pattern to be prepared increase and the manufacturing process becomes complicated.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a multilayer inductor and an inductance adjustment method for the multilayer inductor that can adjust the inductance while ensuring the Q value without using different types of conductor patterns.

  A multilayer inductor according to the present invention includes a multilayer body in which a plurality of insulating layers are laminated, first and second external electrodes disposed on the outer surface of the multilayer body, and a multilayer body in which a plurality of insulator layers are laminated. A plurality of conductor portions arranged along the direction and connected in series between the first external electrode and the second external electrode, wherein the plurality of conductor portions are formed from at least two first conductor patterns. A first conductor portion and a second conductor portion made of one second conductor pattern, and at least two first conductor patterns have the same shape and are continuous in the stacking direction. Each end is electrically connected to the first external electrode and the other ends are electrically connected to each other such that one end of the second conductor pattern is connected to the second external electrode. At least two first electrodes electrically connected to the electrode and at the other end Characterized in that it is electrically connected to the first external electrode through the conductive pattern.

  The multilayer inductor according to the present invention includes a multilayer body in which a plurality of insulating layers are laminated, first and second external electrodes disposed on the outer surface of the multilayer body, and a plurality of insulator layers in the multilayer body. And a plurality of conductor portions connected in series between the first external electrode and the second external electrode, and the number of the conductor portions is m (m is 3 or more). Of the first conductor pattern, and n (n is a natural number of 2 or more and smaller than m) second conductor patterns. The m first conductor patterns have the same shape and are arranged so as to be continuous in the stacking direction, and each one end is electrically connected to the first external electrode so as to be connected in parallel, and each other The ends are electrically connected to each other, and the n second conductor patterns have the same shape and are stacked. The first conductor patterns are arranged in such a manner that each end is electrically connected to the second external electrode and the other ends are electrically connected to each other so as to be connected in parallel. It is electrically connected to the first external electrode via

  In the multilayer inductor according to the present invention described above, a plurality of first conductor patterns are connected in parallel to each other to form a double or more multiple winding coil. Therefore, the direct current resistance is reduced and the Q value is secured. In the multilayer inductor according to the present invention described above, the number of first conductor patterns constituting the first conductor portion is different from the number of second conductor patterns constituting the second conductor portion. Therefore, the number of the first conductor patterns connected in parallel is different from the number of the second conductor patterns connected in parallel. Therefore, the first conductor patterns have the same shape and the second conductor patterns are the same. Even if they have the same shape, the combined inductance of the first conductor portion and the combined inductance of the second conductor portion are different. As a result, it is possible to adjust the inductance while ensuring the Q value without using a different type of conductor pattern from the first conductor pattern and the second conductor pattern.

  On the other hand, the inductance adjustment method for a multilayer inductor according to the present invention is an inductance adjustment method for a multilayer inductor, and the multilayer inductor is disposed on a multilayer body in which a plurality of insulating layers are laminated, and on the outer surface of the multilayer body. A plurality of first and second external electrodes arranged in the laminated body along the lamination direction of the plurality of insulator layers and connected in series between the first external electrode and the second external electrode. A plurality of conductor portions, and the plurality of conductor portions are composed of at least two first conductor patterns and have a number of first conductor portions less than the total number of the plurality of conductor portions, and one second conductor portion. Each including a conductor pattern and having at least one second conductor portion, wherein at least two first conductor patterns have the same shape and are arranged continuously in the stacking direction, and are connected in parallel. One end of the first The second conductor pattern is electrically connected to the second electrode, and the other end is electrically connected to the second external electrode and the other end is electrically connected to the first electrode. The inductance is set to a desired value by electrically connecting to the first external electrode through the conductor pattern and adjusting the number of the first conductor portion and the second conductor portion. .

  Also, the inductance adjustment method for a multilayer inductor according to the present invention is an inductance adjustment method for a multilayer inductor, and the multilayer inductor is disposed on a multilayer body in which a plurality of insulating layers are laminated, and on an outer surface of the multilayer body. A plurality of first and second external electrodes arranged in the laminated body along the lamination direction of the plurality of insulator layers and connected in series between the first external electrode and the second external electrode. And the plurality of conductor portions are formed of m (m is a natural number of 3 or more) first conductor patterns, and the number of first conductors is one less than the total number of the plurality of conductor portions. And n (n is a natural number less than or equal to 2 and smaller than m) second conductor patterns and at least one second conductor pattern, and the m first conductor patterns are Keep the same shape and be continuous in the stacking direction Then, one end is electrically connected to the first external electrode and the other ends are electrically connected to each other so as to be connected in parallel, and the n second conductor patterns have the same shape and are arranged in the stacking direction. Each end is electrically connected to the second external electrode so as to be connected in parallel, and the other ends are electrically connected to each other and connected to each other via the m first conductor patterns. It is characterized in that the inductance is set to a desired value by electrically connecting to one external electrode and adjusting the number of the first conductor portion and the second conductor portion.

  In the above-described inductance adjustment method for a multilayer inductor according to the present invention, a plurality of first conductive patterns are connected in parallel to each other to form a double or more multiple winding coil. Therefore, the direct current resistance is reduced and the Q value is secured. In the method of adjusting the inductance of the multilayer inductor according to the present invention, the inductance is set to a desired value by adjusting the number of the first conductor portions and the second conductor portions. Here, since the number of first conductor patterns constituting the first conductor portion is different from the number of second conductor patterns constituting the second conductor portion, the first conductor patterns have the same shape. Even if the second conductor patterns have the same shape, the combined inductance in the first conductor portion and the combined inductance in the second conductor portion are different. As a result, it is possible to adjust the inductance while ensuring the Q value without using a different type of conductor pattern from the first conductor pattern and the second conductor pattern.

  Further, in the above-described method for adjusting the inductance of the multilayer inductor, the magnitude of the difference between the number of first conductor patterns constituting the first conductor portion and the number of second conductor patterns constituting the second conductor portion. Accordingly, it is preferable to increase or decrease the number of stacked insulating layers. At this time, by adjusting the total number of insulating layers constituting the multilayer body to be constant, it is possible to unify the size of the multilayer inductor while adjusting the inductance.

  ADVANTAGE OF THE INVENTION According to this invention, the inductance adjustment method of a multilayer inductor which can adjust an inductance, ensuring Q value, without using different types of conductor patterns, and a multilayer inductor can be provided.

  Preferred embodiments of the present invention will be described with reference to the drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and a duplicate description is omitted.

(First embodiment)
The configuration of the multilayer inductor L1 according to the first embodiment will be described with reference to FIGS. FIG. 1 is a perspective view of the multilayer inductor according to the first and second embodiments. FIG. 2 is an exploded perspective view for explaining the configuration of the multilayer body included in the multilayer inductor according to the first embodiment.

  As shown in FIG. 1, the multilayer inductor L1 includes a substantially rectangular parallelepiped multilayer body 10 and a pair of external electrodes 12 and 14 formed on both side surfaces of the multilayer body 10 in the longitudinal direction. The bottom surface of the multilayer body 10 is a surface facing the external substrate when the multilayer inductor L1 is mounted on the external substrate (not shown).

  As illustrated in FIG. 2, the stacked body 10 is configured by stacking a plurality (20 layers in the first embodiment) of nonmagnetic layers A1 to A20. The nonmagnetic layers A1 to A20 function as an insulator having electrical insulation. The actual multilayer inductor L1 is integrated so that the boundaries between the nonmagnetic layers A1 to A20 cannot be visually recognized.

  A substantially C-shaped conductor pattern B1 and a lead-out portion B1a are formed on the surface of the nonmagnetic layer A4. A lead-out portion B1a is integrally formed at one end of the conductor pattern B1. The lead-out part B1a of the conductor pattern B1 is drawn out to the edge of the nonmagnetic layer A4, and its end is exposed at the end face of the nonmagnetic layer A4. For this reason, the conductor pattern B1 is electrically connected to the external electrode 12 via the lead-out part B1a. The other end of the conductor pattern B1 is electrically connected to a through-hole electrode C1 formed through the nonmagnetic material layer A4 in the thickness direction. For this reason, the conductor pattern B1 is electrically connected to the other end of the corresponding conductor pattern B2 described later via the through-hole electrode C1 in a stacked state.

  A substantially C-shaped conductor pattern B2 and a lead-out portion B2a are formed on the surface of the nonmagnetic layer A5. The nonmagnetic material layer A5 in which the conductor pattern B2 and the lead-out portion B2a are formed is laminated together with the nonmagnetic material layer A4 in which the conductor pattern B1 and the lead-out portion B1a are formed, thereby forming a laminate that becomes a part of the multilayer body 10. Part 10A is configured. That is, the conductor pattern B1 and the conductor pattern B2 are disposed so as to be continuous in the stacking direction of the stacked body 10. The shapes of the conductor pattern B2 and the lead-out part B2a are the same as the shapes of the conductor pattern B1 and the lead-out part B1a. A lead-out portion B2a is integrally formed at one end of the conductor pattern B2. The lead-out part B2a of the conductor pattern B2 is drawn out to the edge of the nonmagnetic layer A5, and its end is exposed on the end surface of the nonmagnetic layer A5. For this reason, the conductor pattern B2 is electrically connected to the external electrode 12 via the lead-out part B2a. The other end of the conductor pattern B2 is electrically connected to a through-hole electrode C2 formed through the nonmagnetic layer A5 in the thickness direction. For this reason, the conductor pattern B2 is electrically connected to one end of a corresponding later-described conductor pattern B3 through the through-hole electrode C2 in a stacked state.

  A substantially L-shaped conductor pattern B3 is formed on the surface of the nonmagnetic layer A6. One end of the conductor pattern B3 is electrically connected to a through-hole electrode C3 formed through the nonmagnetic layer A6 in the thickness direction. The other end of the conductor pattern B3 is electrically connected to a through-hole electrode C4 formed through the nonmagnetic layer A6 in the thickness direction. For this reason, the conductor pattern B3 is electrically connected to one end and the other end of a corresponding conductor pattern B4, which will be described later, through the through-hole electrodes C3 and C4 in a stacked state.

  A substantially L-shaped conductor pattern B4 is formed on the surface of the nonmagnetic layer A7. The nonmagnetic material layer A7 on which the conductor pattern B4 is formed is laminated together with the nonmagnetic material layer A6 on which the conductor pattern B3 is formed, thereby constituting a laminated portion 10B that becomes a part of the laminated body 10. That is, the conductor pattern B3 and the conductor pattern B4 are disposed so as to be continuous in the stacking direction of the stacked body 10. The shape of the conductor pattern B4 is the same as the shape of the conductor pattern B3. One end of the conductor pattern B4 includes a region electrically connected to the through-hole electrode C3 in a stacked state. The other end of the conductor pattern B4 is electrically connected to a through-hole electrode C5 formed through the nonmagnetic layer A7 in the thickness direction. Therefore, the conductor pattern B4 is electrically connected to one end of a corresponding later-described conductor pattern B5 through the through-hole electrode C5 in a stacked state.

  On the surface of the nonmagnetic layer A8, a substantially L-shaped conductor pattern B5 is formed. One end of the conductor pattern B5 is electrically connected to a through-hole electrode C6 formed through the nonmagnetic layer A8 in the thickness direction. The other end of the conductor pattern B5 is electrically connected to a through-hole electrode C7 formed through the nonmagnetic layer A8 in the thickness direction. Therefore, the conductor pattern B5 is electrically connected to one end and the other end of a corresponding conductor pattern B6, which will be described later, through the through-hole electrodes C6 and C7 in a stacked state.

  A substantially L-shaped conductor pattern B6 is formed on the surface of the nonmagnetic layer A9. The nonmagnetic material layer A9 on which the conductor pattern B6 is formed is laminated together with the nonmagnetic material layer A8 on which the conductor pattern B3 is formed, thereby constituting a laminated portion 10C that becomes a part of the laminated body 10. That is, the conductor pattern B5 and the conductor pattern B6 are disposed so as to be continuous in the stacking direction of the stacked body 10. The shape of the conductor pattern B6 is the same as the shape of the conductor pattern B5. One end of the conductor pattern B6 includes a region electrically connected to the through-hole electrode C6 in a stacked state. The other end of the conductor pattern B6 is electrically connected to a through-hole electrode C8 formed through the nonmagnetic layer A9 in the thickness direction. For this reason, the conductor pattern B6 is electrically connected to one end of a corresponding later-described conductor pattern B7 through the through-hole electrode C8 in a stacked state.

  A substantially L-shaped conductor pattern B7 is formed on the surface of the nonmagnetic layer A10. One end of the conductor pattern B7 is electrically connected to a through-hole electrode C9 formed through the nonmagnetic layer A10 in the thickness direction. The other end of the conductor pattern B7 is electrically connected to a through-hole electrode C10 formed through the nonmagnetic layer A10 in the thickness direction. Therefore, the conductor pattern B7 is electrically connected to one end and the other end of a corresponding conductor pattern B8, which will be described later, through the through-hole electrodes C9 and C10 in a stacked state.

  A substantially L-shaped conductor pattern B8 is formed on the surface of the nonmagnetic layer A11. The nonmagnetic material layer A11 on which the conductor pattern B8 is formed is laminated together with the nonmagnetic material layer A10 on which the conductor pattern B7 is formed, thereby constituting a laminated portion 10D that becomes a part of the laminated body 10. That is, the conductor pattern B7 and the conductor pattern B8 are disposed so as to be continuous in the stacking direction of the stacked body 10. The shape of the conductor pattern B8 is the same as the shape of the conductor pattern B7. One end of the conductor pattern B8 includes a region electrically connected to the through-hole electrode C9 in a stacked state. The other end of the conductor pattern B8 is electrically connected to a through-hole electrode C11 formed through the nonmagnetic layer A11 in the thickness direction. For this reason, the conductor pattern B8 is electrically connected to one end of a corresponding later-described conductor pattern B9 via the through-hole electrode C11 in a stacked state.

  A substantially L-shaped conductor pattern B9 is formed on the surface of the nonmagnetic layer A12. One end of the conductor pattern B9 is electrically connected to a through-hole electrode C12 formed through the nonmagnetic layer A12 in the thickness direction. The other end of the conductor pattern B9 is electrically connected to a through-hole electrode C13 formed through the nonmagnetic layer A12 in the thickness direction. Therefore, the conductor pattern B9 is electrically connected to one end and the other end of a corresponding conductor pattern B10, which will be described later, through the through-hole electrodes C12 and C13 in a stacked state.

  A substantially L-shaped conductor pattern B10 is formed on the surface of the nonmagnetic layer A13. The nonmagnetic material layer A13 on which the conductor pattern B10 is formed is laminated together with the nonmagnetic material layer A12 on which the conductor pattern B9 is formed, thereby constituting a laminated portion 10E that becomes a part of the laminated body 10. That is, the conductor pattern B9 and the conductor pattern B10 are arranged so as to be continuous in the stacking direction of the stacked body 10. The shape of the conductor pattern B10 is the same as the shape of the conductor pattern B9. One end of the conductor pattern B10 includes a region electrically connected to the through-hole electrode C12 in a stacked state. The other end of the conductor pattern B10 is electrically connected to a through-hole electrode C14 formed through the nonmagnetic layer A13 in the thickness direction. For this reason, the conductor pattern B10 is electrically connected to one end of a corresponding later-described conductor pattern B11 via the through-hole electrode C14 in a stacked state.

  A substantially L-shaped conductor pattern B11 is formed on the surface of the nonmagnetic layer A14. One end of the conductor pattern B11 is electrically connected to a through-hole electrode C15 formed through the nonmagnetic layer A14 in the thickness direction. The other end of the conductor pattern B11 is electrically connected to a through-hole electrode C16 formed through the nonmagnetic layer A14 in the thickness direction. For this reason, the conductor pattern B11 is electrically connected to one end and the other end of a corresponding conductor pattern B12, which will be described later, via the through-hole electrodes C14 and C15 in a stacked state.

  On the surface of the nonmagnetic layer A15, a substantially L-shaped conductor pattern B12 is formed. The nonmagnetic material layer A15 on which the conductor pattern B12 is formed is laminated together with the nonmagnetic material layer A14 on which the conductor pattern B11 is formed, thereby forming a laminated portion 10F that becomes a part of the laminated body 10. That is, the conductor pattern B11 and the conductor pattern B12 are disposed so as to be continuous in the stacking direction of the stacked body 10. The shape of the conductor pattern B12 is the same as the shape of the conductor pattern B11. One end of the conductor pattern B12 includes a region electrically connected to the through-hole electrode C15 in a stacked state. The other end of the conductor pattern B12 is electrically connected to a through-hole electrode C17 formed through the nonmagnetic layer A15 in the thickness direction. For this reason, the conductor pattern B12 is electrically connected to one end of a corresponding later-described conductor pattern B13 through the through-hole electrode C17 in a stacked state.

  A substantially L-shaped conductor pattern B13 is formed on the surface of the nonmagnetic layer A16. The nonmagnetic material layer A16 on which the conductor pattern B13 is formed constitutes a laminated portion 10G that becomes a part of the laminated body 10. One end of the conductor pattern B13 includes a region electrically connected to the through-hole electrode C17 in a stacked state. The other end of the conductor pattern B13 is electrically connected to a through-hole electrode C18 formed through the nonmagnetic layer A16 in the thickness direction. For this reason, the conductor pattern B13 is electrically connected to one end of a corresponding later-described conductor pattern B14 via the through-hole electrode C18 in a stacked state.

  A substantially C-shaped conductor pattern B14 and a lead-out portion B14a are formed on the surface of the nonmagnetic layer A17. One end of the conductor pattern B14 is electrically connected to a through-hole electrode C19 formed through the nonmagnetic layer A17 in the thickness direction. For this reason, the conductor pattern B14 is electrically connected to the other end of a corresponding conductor pattern B15, which will be described later, through the through-hole electrode C19 in a stacked state. A lead-out part B14a is integrally formed at the other end of the conductor pattern B14. The lead-out part B14a of the conductor pattern B14 is drawn out to the edge of the nonmagnetic layer A17, and its end is exposed at the end face of the nonmagnetic layer A17. For this reason, the conductor pattern B14 is electrically connected to the external electrode 14 via the lead-out part B14a.

  A substantially C-shaped conductor pattern B15 and a lead-out portion B15a are formed on the surface of the nonmagnetic layer A18. The nonmagnetic material layer A18 in which the conductor pattern B15 and the lead-out portion B15a are formed is laminated together with the nonmagnetic material layer A17 in which the conductor pattern B14 and the lead-out portion B14a are formed, thereby forming a laminate that becomes a part of the multilayer body 10. Part 10H is configured. That is, the conductor pattern B14 and the conductor pattern B15 are disposed so as to be continuous in the stacking direction of the stacked body 10. The shapes of the conductor pattern B15 and the lead-out portion B15a are the same as the shapes of the conductor pattern B14 and the lead-out portion B14a. One end of the conductor pattern B15 includes a region electrically connected to the through-hole electrode C19 in a stacked state. A lead-out part B15a is integrally formed at the other end of the conductor pattern B15. The lead-out portion B15a of the conductor pattern B15 is drawn out to the edge of the nonmagnetic layer A18, and its end is exposed at the end face of the nonmagnetic layer A18. For this reason, the conductor pattern B15 is electrically connected to the external electrode 14 via the lead-out part B15a.

  Next, the circuit configuration of the multilayer inductor L1 will be described with reference to FIG. FIG. 3 is a diagram for explaining a circuit configuration of the multilayer inductor according to the first embodiment.

As shown in FIG. 3, the conductor patterns B1 to B15 arranged in the multilayer body 10 constitute coils 16 _{1 to} 16 ₁₅ in the multilayer inductor L1, respectively. The coil 16 ₁ and the coil 16 _2, and the other ends with each end is electrically connected to each other are electrically connected to each other, they are connected in parallel. The coil 16 ₃ and the coil 16 _4, the other ends with each end is electrically connected to each other are electrically connected to each other, are connected in parallel. The coil 16 ₅ and the coil 16 _6, and the other ends with each end is electrically connected to each other are electrically connected to each other, they are connected in parallel. The coil 16 ₇ and the coil 16 _8, the other ends with each end is electrically connected to each other are electrically connected to each other, are connected in parallel. The coil 16 ₉ and the coil 16 _10, the other ends with each end is electrically connected to each other are electrically connected to each other, are connected in parallel. The coil 16 ₁₁ and the coil 16 _12, the other ends with each end is electrically connected to each other are electrically connected to each other, are connected in parallel. The coil 16 ₁₄ and the coil 16 _15, the other ends with each end is electrically connected to each other are electrically connected to each other, are connected in parallel. Hereinafter, the parallel connected coils 16 ₁ and 16 ₂ and the conductor portion 16A are collectively referred, called conductor portion 16B are collectively and coil 16 ₃ and 16 ₄ which are connected in parallel, the coils 16 ₅ which are connected in parallel 16 referred ₆ and the conductor portion 16C collectively, referred to as the conductor portion 16D are collectively a coil 16 ₇ and 16 ₈ which are connected in parallel, and the conductor portion 16E are collectively a coil 16 ₉ and _{16 10} which are connected in parallel called, called parallel connected coils _{16 11} and _{16 12} and to collectively as the conductor portion 16F and referred to coil _{16 13} the conductor portion 16G, and the conductor portion 16H are collectively and coil _{16 14} and _{16 15} which are connected in parallel Called. The external electrode 12, the conductor portions 16A to 16H, and the external electrode 14 are connected in series in this order. That is, the conductor pattern B13 constituting the conductor portion 16G is electrically connected to the external electrode 12 via the conductor portions 16A to 16F and electrically connected to the external electrode 14 via the conductor portion 16H.

  Next, a method for manufacturing the multilayer inductor L1 having the above-described configuration will be described.

  First, a plurality of nonmagnetic green sheets that are precursors of the nonmagnetic layers A1 to A20 are prepared. The non-magnetic green sheet is formed by applying a slurry using ferrite (for example, Cu—Zn-based ferrite) as a raw material on a film by a doctor blade method. The thickness of the nonmagnetic green sheet is, for example, 70 μm.

  Subsequently, through holes are formed by laser processing or the like at predetermined positions of the nonmagnetic green sheets to be the nonmagnetic layers A4 to A17, that is, positions where the through hole electrodes C1 to C19 are to be formed. And conductive paste which is a precursor of conductor pattern B1-B15, derivation | leading-out part B1a, B2a, B14a, B15a, and through-hole electrode C1-C19 is used for each nonmagnetic green sheet used as nonmagnetic material layer A4-A18. Printing is performed at a predetermined position using a metal mask or the like. Examples of the main component of the conductive paste include silver or nickel.

  Subsequently, the nonmagnetic green sheets to be the nonmagnetic layers A1 to A20 are laminated in the order shown in FIG. 2, and pressure is applied in the laminating direction so that no gap is generated between the nonmagnetic green sheets. Crimp to. Then, after the pressure-bonded nonmagnetic green sheet is cut into chips, firing is performed at a predetermined temperature (for example, about 840 ° C. to 900 ° C.) to form the laminate 10. By firing in this way, the nonmagnetic green sheets become nonmagnetic layers A1 to A20, and the conductive paste becomes conductive patterns B1 to B15, lead portions B1a, B2a, B14a, B15a, and through-hole electrodes C1 to C15. C19. For example, the length of the laminate 10 in the longitudinal direction after firing is 3.2 mm, the width is 2.5 mm, and the height is 1.3 mm. Each of the conductor patterns B1 to B15 and the lead-out portions B1a, B2a, B14a, and B15a has, for example, a width after firing of 250 μm and a thickness of 35 μm.

  Subsequently, external electrodes 12 and 14 are formed on the laminate 10. Thereby, the multilayer inductor L1 is formed. The external electrodes 12 and 14 are applied with electrode paste mainly composed of silver, nickel, or copper on both end faces in the longitudinal direction of the laminate 10 and baked at a predetermined temperature (for example, about 680 ° C. to 900 ° C.). Further, it is formed by performing electroplating. For this electroplating, Cu, Ni, Sn, or the like can be used.

As described above, in the first embodiment, the coils 16 ₁ and 16 ₂ , the coils 16 ₃ and 16 ₄ , the coils 16 ₅ and 16 ₆ , the coils 16 ₇ and 16 ₈ , the coils 16 ₉ and 16 ₁₀ , and the coil 16 _{11 are used.} , _{16 12} and the coil ₁₆ 14, _{16 15} are connected in parallel, respectively, a double-wound conductor section 16A-16F, constitute a 16H. Here, synthetic DC resistance R of the parallel connected coils is represented by the following formula (1) when the DC resistance of each coil was R _i. Therefore, the direct current resistance is reduced as a whole of the multilayer inductor L1, and the Q value is secured.

In the first embodiment, the conductor portions 16A to 16F and 16H have two conductor patterns, and the conductor portion 16G has one conductor pattern. Here, the combined inductance L of the parallel connected coils is represented by the following formula (2) when the inductance of each coil was L _i. Therefore, the inductance of the conductor portion 16G (coil 16 ₁₃ ) is larger than the combined inductance of the other conductor portions 16A to 16F and 16H. As a result, the inductance of the multilayer inductor L1 as a whole is larger in the conductor portion 16G than in the case where two conductor patterns having the same shape are connected in parallel as in the other conductor portions 16A to 16F and 16H. Will be adjusted as follows. Therefore, it is possible to adjust the inductance while ensuring the Q value without changing the inner diameter of the coil using different types of conductor patterns.

  In the first embodiment, the number of conductor patterns constituting the conductor portions 16A to 16F and 16H is two, the number of conductor patterns constituting the conductor portion 16G is one, and the conductor portions 16A to 16F. , 16H and the number of conductor patterns constituting the conductor portion 16G are one. Then, according to the magnitude of this difference, the total number of insulating layers constituting the stacked body 10 is constant (the first number) using the nonmagnetic layers A1 to A3, A19, and A20 on which the conductor pattern is not formed. In the embodiment, it is adjusted to be 20 layers). As a result, the size of the multilayer inductor L1 can be set to a predetermined size while adjusting the inductance of the multilayer inductor L1.

  In the first embodiment, not only the two conductor patterns constituting the conductor portions 16A to 16F and 16H have the same shape, but the conductor patterns B3, B4, B7, B8, B11, and B12 The conductor patterns B5, B6, B9, B10, B13 have the same shape, and the conductor patterns B3, B4, B7, B8, B11, B12 and the conductor patterns B5, B6, B9, B10, B13 are dotted. It is symmetrical. Therefore, a common metal mask for forming the conductor patterns B3 to B13 can be used, so that the cost can be reduced.

  In the first embodiment, since the through-hole electrode C18 corresponding to only the other end of the conductor pattern B13 constituting the conductor portion 16G is formed in the nonmagnetic layer A16, the nonmagnetic layer A17 is formed. A short circuit with the conductor pattern B14 formed on the substrate is prevented.

(Second Embodiment)
Next, the configuration of the multilayer inductor L2 according to the second embodiment will be described with reference to FIGS. FIG. 4 is an exploded perspective view for explaining the configuration of the multilayer body included in the multilayer inductor according to the second embodiment. Below, it demonstrates centering around difference with the multilayer inductor L1 which concerns on 1st Embodiment, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 1, the multilayer inductor L <b> 2 includes a substantially rectangular parallelepiped multilayer body 20 and a pair of external electrodes 12 and 14 formed on both side surfaces in the longitudinal direction of the multilayer body 20. As shown in FIG. 4, the laminate 20 is configured by laminating a plurality (20 layers in the second embodiment) of nonmagnetic layers A1, A4 to A15, A17 to A23.

  A substantially L-shaped conductor pattern B21 is formed on the surface of the nonmagnetic layer A21. The conductor pattern B21 is electrically connected to the other end of the corresponding conductor pattern B12 via the through-hole electrode C17 in a stacked state. One end of the conductor pattern B21 is electrically connected to a through-hole electrode C21 formed through the nonmagnetic layer A21 in the thickness direction. The other end of the conductor pattern B21 is electrically connected to a through-hole electrode C22 formed through the nonmagnetic layer A21 in the thickness direction. Therefore, the conductor pattern B21 is electrically connected to one end and the other end of a corresponding conductor pattern B22, which will be described later, through the through-hole electrodes C21 and C22 in a stacked state.

  A substantially L-shaped conductor pattern B22 is formed on the surface of the nonmagnetic layer A22. One end of the conductor pattern B22 is electrically connected to a through-hole electrode C23 formed through the nonmagnetic layer A22 in the thickness direction. The other end of the conductor pattern B22 is electrically connected to a through-hole electrode C24 formed through the nonmagnetic layer A22 in the thickness direction. For this reason, the conductor pattern B22 is electrically connected to one end and the other end of a corresponding conductor pattern B23, which will be described later, through the through-hole electrodes C23 and C24 in a stacked state.

  On the surface of the nonmagnetic layer A23, a substantially L-shaped conductor pattern B23 is formed. The nonmagnetic material layer A23 on which the conductor pattern B23 is formed is laminated together with the nonmagnetic material layer A21 on which the conductor pattern B21 is formed and the nonmagnetic material layer A22 on which the conductor pattern B22 is formed. A part of the stacked portion 20G is configured. That is, the conductor patterns B <b> 21 to B <b> 23 are arranged so as to be continuous in the stacking direction of the stacked body 20. The shape of the conductor pattern B23 is the same as the shapes of the conductor patterns B21 and B22. One end of the conductor pattern B23 includes a region electrically connected to the through-hole electrode C23 in a stacked state. The other end of the conductor pattern B23 is electrically connected to a through-hole electrode C25 formed through the nonmagnetic layer A23 in the thickness direction. For this reason, the conductor pattern B23 is electrically connected to one end of the corresponding conductor pattern B14 via the through-hole electrode C25 in a stacked state.

  Next, the circuit configuration of the multilayer inductor L2 will be described with reference to FIG. FIG. 5 is a diagram for explaining a circuit configuration of the multilayer inductor according to the second embodiment.

As shown in FIG. 5, the conductor patterns B1 to B12, B14, 15, and B21 to B23 arranged in the multilayer body 20 are coils 16 _{1 to} 16 ₁₂ , 16 ₁₄ , and 16 ₁₅ , respectively, in the multilayer inductor L1. constitute the _{26 21-26 23.} The coil 26 ₂₁ , the coil 26 _22, and the coil 26 ₂₃ are connected in parallel with one end electrically connected to each other and the other end electrically connected to each other. Hereinafter, the coil 26 ₂₁ , the coil 26 _22, and the coil 26 ₂₃ connected in parallel are collectively referred to as a conductor portion 26G. The external electrode 12, the conductor portions 16A to 16F, the conductor portion 26G, the conductor portion 16H, and the external electrode 14 are connected in series in this order. That is, the conductor patterns B21 to B23 constituting the conductor portion 26G are electrically connected to the external electrode 12 via the conductor portions 16A to 16F and electrically connected to the external electrode 14 via the conductor portion 16H. .

As described above, in the second embodiment, the coils 16 ₁ and 16 ₂ , the coils 16 ₃ and 16 ₄ , the coils 16 ₅ and 16 ₆ , the coils 16 ₇ and 16 ₈ , the coils 16 ₉ and 16 ₁₀ , and the coil 16 _{11 are used.} , _{16 12} and the coil ₁₆ 14, _{16 15} are connected in parallel, respectively, a double-wound conductor section 16A-16F, constitute a 16H. Here, synthetic DC resistance R of the parallel connected coils is represented by the above formula (1) when the DC resistance of each coil was R _i. Therefore, the direct current resistance is reduced as a whole of the multilayer inductor L1, and the Q value is secured.

In the second embodiment, the conductor portions 16A to 16F and 16H have two conductor patterns, and the conductor portion 26G has three conductor patterns. Here, the combined inductance L of the parallel connected coils is represented by the above formula (2) when the inductance of each coil was L _i. Therefore, the combined inductance of the conductor portion 26G (coils 26 _{21 to} 26 ₂₃ ) is smaller than the combined inductance of the other conductor portions 16A to 16F and 16H. As a result, the inductance of the multilayer inductor L2 as a whole is smaller in the conductor 16G than in the case where two conductor patterns having the same shape are connected in parallel as in the other conductors 16A to 16F and 16H. Will be adjusted as follows. Therefore, it is possible to adjust the inductance while ensuring the Q value without changing the inner diameter of the coil using different types of conductor patterns.

  In the second embodiment, the number of conductor patterns constituting the conductor portions 16A to 16F and 16H is two, the number of conductor patterns constituting the conductor portion 26G is three, and the conductor portions 16A to 16F. , 16H and the number of conductor patterns constituting the conductor portion 26G are -1. In accordance with the magnitude of this difference, the total number of insulating layers constituting the multilayer body 20 is constant using the nonmagnetic layers A1, A19, and A20 on which no conductor pattern is formed (second embodiment). Is adjusted to be 20 layers). As a result, the size of the multilayer inductor L2 can be set to a predetermined size while adjusting the inductance of the multilayer inductor L2.

  In the second embodiment, only the two conductor patterns constituting the conductor portions 16A to 16F and 16H have the same shape, and the three conductor patterns constituting the conductor portion 26G have the same shape. The conductor patterns B3, B4, B7, B8, B11, B12 have the same shape, the conductor patterns B5, B6, B9, B10, B21, B22, B23 have the same shape, and the conductor patterns B3, B4, B7, B8, B11, B12 and conductor patterns B5, B6, B9, B10, B21, B22, B23 are point-symmetric. For this reason, a metal mask for forming the conductor patterns B3 to B12 and B21 to B23 can be shared, so that the cost can be reduced.

Further, in the second embodiment, through-hole electrodes C21 to C24 corresponding to both ends as well as one of the conductor patterns B21 and B22 constituting the conductor portion 16G are provided on the nonmagnetic layers A21 and A22, respectively. Since it is formed, the parallel connection of the three coils 26 _{21 to} 26 ₂₃ corresponding to the conductor patterns B ₂₁ to B ₂₃ is realized.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments. For example, in the first embodiment, each of the conductor portions 16A to 16F and 16H has two conductor patterns and the laminated portion 10G has one conductor pattern, but the present invention is not limited to this. Specifically, the conductor portions 16A to 16F and 16H may be configured by three or more conductor patterns, and one end thereof may be electrically connected to each other and the other end may be electrically connected to each other. At this time, the conductor portion 16G is constituted by a smaller number of conductor patterns than the number of conductor patterns constituting the conductor portions 16A to 16F, 16H, and one end thereof is electrically connected to each other and the other end is What is necessary is just to be electrically connected to each other.

  In the second embodiment, the conductor portions 16A to 16F and 16H have two conductor patterns and the conductor portion 26G has three conductor patterns. However, the present invention is not limited to this. Specifically, the conductor portion 26G may be configured by four or more conductor patterns, and one end thereof may be electrically connected to each other and the other end may be electrically connected to each other. At this time, the conductor portion 26G is configured by two or more conductor patterns smaller than the number of conductor patterns constituting the conductor portions 16A to 16F and 16H, and their one ends are electrically connected to each other. In addition, it is only necessary that the other ends are electrically connected to each other.

  In the first and second embodiments, only one of the conductor portions 16G and 26G has a conductor portion constituted by a number of conductor patterns different from the number of conductor patterns constituting the conductor portions 16A to 16F and 16H. There was, but is not limited to this. That is, the laminates 10 and 20 have a number of conductor parts (hereinafter referred to as first conductor parts) that is one less than the total number of conductor parts and the number of conductor patterns constituting the first conductor parts. You may adjust the number of 1st conductor parts and 2nd conductor parts so that it may have at least 1 conductor part (henceforth a 2nd conductor part) comprised by a conductor pattern. At this time, the number of conductor patterns included in each of the first conductor portion and the second conductor portion is adjusted so that the number of conductor patterns that are point-symmetric with each other (for example, conductor pattern B3 and conductor pattern B5) is equal. Then, it is preferable because the balance can be maintained in the direction intersecting the stacking direction of the stacked bodies 10 and 20. In addition, it is more preferable that the number of the second stacked portions included in the stacked bodies 10 and 20 is one or two.

It is a perspective view of the multilayer inductor according to the first and second embodiments. It is a disassembled perspective view for demonstrating the structure of the laminated body with which the multilayer inductor which concerns on 1st Embodiment is provided. It is a figure for demonstrating the circuit structure of the multilayer inductor which concerns on 1st Embodiment. It is a disassembled perspective view for demonstrating the structure of the laminated body with which the multilayer inductor which concerns on 2nd Embodiment is provided. It is a figure for demonstrating the circuit structure of the multilayer inductor which concerns on 2nd Embodiment.

Explanation of symbols

10, 20 ... laminate, 12, 14 ... external _electrode, 16 ₁ to 16 _15, 26 21 to 26 _{23 ...} coil, 16a-16h, 26G ... conductor portion, A1-A23 ... non-magnetic layer, B1～B18, B21 to B23... Conductor pattern, B1a, B2a, B14a, B15a... Derived portion, C1 to C19, C21 to C25... Through-hole electrode, L1, L2.

Claims (5)

A laminate in which a plurality of insulating layers are laminated;
First and second external electrodes disposed on the outer surface of the laminate;
A plurality of conductor portions disposed in the stack in the stacking direction of the plurality of insulator layers and connected in series between the first external electrode and the second external electrode;
Said plurality of conductor portions is composed of at least a first conductor portion consisting of two first conductor pattern, and the second conductor portion consisting of one of the second conductor pattern, the first and second It is arranged between the laminated parts with the lead-out part to the external electrode,
The at least two first conductor patterns have the same shape and are arranged so as to be continuous in the stacking direction, and each one end is electrically connected to the first external electrode so as to be connected in parallel. Each other end is electrically connected to each other,
The second conductor pattern forms a coil together with the first conductor pattern, and one end is electrically connected to the second external electrode and the other end is the at least two first conductor patterns. Electrically connected to the first external electrode via
The multilayer inductor, wherein the first and second conductor patterns have the same shape. A laminate in which a plurality of insulating layers are laminated;
First and second external electrodes disposed on the outer surface of the laminate;
A plurality of conductor portions disposed in the stack in the stacking direction of the plurality of insulator layers and connected in series between the first external electrode and the second external electrode;
The plurality of conductor portions include a first conductor portion formed of m (m is a natural number of 3 or more) first conductor patterns and n (n is a natural number of 2 or more and smaller than m) second conductors. is composed of a second conductor portion consisting of a pattern is disposed between the laminated portion including a lead portion to the first and second external electrodes,
The m first conductor patterns have the same shape and are arranged so as to be continuous in the stacking direction, and each one end is electrically connected to the first external electrode so as to be connected in parallel. Each other end is electrically connected to each other,
The n second conductor patterns constitute a coil together with the first conductor pattern, are arranged in the same shape and are continuous in the laminating direction, and each one end is connected in parallel. Electrically connected to the second external electrode and each other end electrically connected to each other and electrically connected to the first external electrode via the m first conductor patterns;
The multilayer inductor, wherein the first and second conductor patterns have the same shape. An inductance adjustment method for a multilayer inductor,
The multilayer inductor includes a laminate in which a plurality of insulating layers are laminated, first and second external electrodes disposed on an outer surface of the laminate, and a laminate of the plurality of insulator layers on the laminate. A plurality of conductor portions arranged in a direction and connected in series between the first external electrode and the second external electrode;
Said plurality of conductor portions, at least Ru two first conductor pattern Tona of the plurality of small number one less than the total number of the conductive portion the first conductor portion, the first conductor pattern and the same shape exhibited and the is composed of a first and at least one second conductor portions Ru one second conductor pattern Tona constituting the coil with conductor patterns, the derivation of the first and second external electrodes Arranged between the laminated parts comprising the parts,
The at least two first conductor patterns have the same shape and are arranged so as to be continuous in the stacking direction, and one end is electrically connected to the first external electrode and the other end is connected in parallel. Electrically connect to each other,
One end of the second conductor pattern is electrically connected to the second external electrode, and the other end is electrically connected to the first external electrode via the at least two first conductor patterns. ,
An inductance adjustment method for a multilayer inductor, wherein the inductance is set to a desired value by adjusting the number of the first conductor portions and the second conductor portions. An inductance adjustment method for a multilayer inductor,
The multilayer inductor includes a laminate in which a plurality of insulating layers are laminated, first and second external electrodes disposed on an outer surface of the laminate, and a laminate of the plurality of insulator layers on the laminate. A plurality of conductor portions arranged in a direction and connected in series between the first external electrode and the second external electrode;
Said plurality of conductor portions, and m pieces (m is a natural number of 3 or more) first conductor pattern Tona Ru said plurality of first conductor portion of the small number two less than the total number of the conductive portion of the second and presents a first conductor pattern and the same shape, n (n is 2 or more and m a natural number smaller than) Ru second conductor pattern of Tona least one second constituting the coil with the first conductor pattern A conductor portion, and is disposed between the laminated portions including lead portions to the first and second external electrodes,
The m first conductor patterns have the same shape and are arranged so as to be continuous in the laminating direction. Each one end is electrically connected to the first external electrode so as to be connected in parallel, and each other end Electrically connect to each other,
The n second conductor patterns have the same shape and are arranged so as to be continuous in the laminating direction. Each one end is electrically connected to the second external electrode so as to be connected in parallel, and each other end Are electrically connected to each other and electrically connected to the first external electrode through the m first conductor patterns,
An inductance adjustment method for a multilayer inductor, wherein the inductance is set to a desired value by adjusting the number of the first conductor portions and the second conductor portions.   The plurality of insulating layers according to the magnitude of the difference between the number of the first conductor patterns constituting the first conductor portion and the number of the second conductor patterns constituting the second conductor portion. 5. The method of adjusting the inductance of a multilayer inductor according to claim 4, wherein the number of layers is increased or decreased.

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