WO2012077315A1 - Laminated inductor - Google Patents

Laminated inductor Download PDF

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Publication number
WO2012077315A1
WO2012077315A1 PCT/JP2011/006759 JP2011006759W WO2012077315A1 WO 2012077315 A1 WO2012077315 A1 WO 2012077315A1 JP 2011006759 W JP2011006759 W JP 2011006759W WO 2012077315 A1 WO2012077315 A1 WO 2012077315A1
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coil
layer
inductor
coil pattern
pattern
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PCT/JP2011/006759
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French (fr)
Japanese (ja)
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穣 岩永
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株式会社村田製作所
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/0006—Printed inductances
    • H01F17/0033—Printed inductances with the coil helically wound around a magnetic core

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  • the present invention includes an inductor unit in which a plurality of magnetic layers and a plurality of coil electrode layers having a spiral coil pattern are alternately stacked, and the coil patterns of the plurality of coil electrode layers are connected in series in the stacking direction.
  • the present invention relates to a multilayer inductor.
  • a plurality of magnetic layers 501 and a coil electrode layer 503 having a coil pattern 502 are alternately stacked, and the coil patterns 502 are sequentially connected in series in the stacking direction.
  • a coil that spirals in a magnetic material while being superimposed in the stacking direction is formed, and the multilayer inductor 500 in which both ends of the formed coil are connected to the external electrode 505 via the extraction electrode 504 is known.
  • Patent Document 1 If comprised in this way, since the circumference
  • FIG. 8A and 8B are diagrams illustrating an example of a conventional multilayer inductor, in which FIG. 8A is an external view, FIG. 8B is a diagram illustrating an upper surface of the coil pattern 502, and FIG. 8C is a cross-sectional view.
  • JP 2006-318946 A paragraphs [0015] to [0018], FIG. 1 etc.
  • each coil pattern 502 of the coil electrode layer 503 is formed by being spirally wound to increase the strength of the magnetic field and increase the inductance.
  • ESR equivalent series resistance
  • the present invention has been made in view of the above-described problems, and an object thereof is to provide a technique capable of suppressing an increase in loss while increasing an inductance.
  • a plurality of magnetic layers and a plurality of coil electrode layers having a spiral coil pattern are alternately stacked, and an inductor unit is provided in which the coil patterns are connected in series in the stacking direction.
  • the number of turns of the coil pattern of at least the uppermost layer side and the lowermost layer side of the inductor portion among the coil electrode layers is equal to the coil pattern on the layer center side of the inductor portion.
  • the number of turns is less than the number of turns (claim 1).
  • the number of turns of the coil pattern of at least the uppermost layer side and the lowermost layer side of the inductor portion among the coil electrode layers is 1 or less (Claim 2).
  • the number of turns of the coil pattern of each coil electrode layer may increase from the uppermost layer side and the lowermost layer side of the inductor portion toward the layer center side of the inductor portion. ).
  • nonmagnetic layers provided on both main surfaces of the inductor portion.
  • a plurality of magnetic layers and a plurality of coil electrode layers having a spiral coil pattern are alternately stacked, and each coil pattern is connected in series in the stacking direction to form an inductor portion.
  • the coil pattern in the center part of the inductor part is formed in a spiral shape with little magnetic leakage and a large effect of increasing the inductance by forming the coil pattern in a spiral shape.
  • the coil electrodes on the uppermost layer side and the lowermost layer side of at least the inductor portion which increase the inductance of the inductor portion and have a large magnetic leakage and a small effect of increasing the inductance by winding the coil pattern in a spiral shape.
  • the line length of the entire coil electrode layer when each coil pattern is connected in series in the stacking direction is shortened. can do. For this reason, it can suppress that loss increases.
  • At least the coil of the coil electrode layer on the uppermost layer side and the lowermost layer side of the inductor portion which has a large magnetic leakage and has a small effect of increasing the inductance due to the coil pattern wound in a spiral shape.
  • the third aspect of the present invention there is less magnetic leakage from the uppermost layer side and the lowermost layer side of the inductor portion, which has a large magnetic leakage and has a small effect of increasing the inductance by forming the coil pattern in a spiral shape.
  • a multilayer inductor can be provided with a practical configuration by providing non-magnetic layers on both main surfaces of the inductor section.
  • FIG. 6 is a diagram illustrating a modification of the multilayer inductor of FIG. 1.
  • FIG. 6 is a diagram illustrating a modification of the multilayer inductor of FIG. 1.
  • FIG. 1 is a diagram showing an internal configuration of a first embodiment of a multilayer inductor according to the present invention
  • FIGS. 1 is a diagram showing an internal configuration of a first embodiment of a multilayer inductor according to the present invention
  • the multilayer inductor shown in FIG. 1 is used for a DC-DC converter or the like, in which a plurality of magnetic layers 1 and a plurality of coil electrode layers 3 having a spiral coil pattern 2 are alternately stacked, Each coil pattern 2 includes an inductor portion connected in series in the stacking direction by via holes 4 (via conductors) for interlayer connection.
  • the inductor part is formed by winding the coil pattern 2 around the magnetic layer 1 in a spiral shape, and the first layer L1 provided with the external connection electrode layer formed of the electrode patterns 5a and 5b on the magnetic layer 1.
  • the second layer L2 to the tenth layer L10 provided with the coil electrode layer 3 are provided.
  • Each of the layers L1 to L10 is made of a ceramic sheet formed of a magnetic material such as Ni—Zn—Fe or Ni—Zn—Cu, an Ag alloy such as Ag or Ag—Pd, or a conductor paste such as Cu.
  • predetermined electrode patterns 5a and 5b and coil pattern 2 are printed and formed.
  • via holes are formed in each of the layers L1 to L10 by a laser or the like, and via holes 4 (via conductors) for interlayer connection are formed by filling the inside with a conductive paste, and the first layers L1 to L10 are formed.
  • an inductor part laminated inductor
  • the electrode pattern 5a provided in the first layer L1 shown in FIG. 1A is connected to one end 2a of the coil pattern 2 included in the second layer L2 shown in FIG.
  • the electrode pattern 5b provided in L1 is connected to the other end 2b of the coil pattern 2 included in the tenth layer L10 shown in FIG.
  • Each of the coil patterns 2 shown in FIGS. 1C to 1I has one end 2a one end 2a of the lower coil pattern 2, and the other end 2b one end 2a of the upper coil pattern 2. They are connected by via holes 4.
  • the coil electrode layers 3 the second layer L2, the third layer L3, the fourth layer L4, the seventh layer L7, the first layer L2, the coil layer 3 on the uppermost layer side and the lowermost layer side of the inductor portion are included.
  • the number of turns of the coil pattern 2 of the coil electrode layer 3 of the eighth layer L8, the ninth layer L9, and the tenth layer L10 is 1 or less.
  • the coil pattern 2 of the two coil electrode layers 3 of the fifth layer L5 and the sixth layer L6 is formed by being wound a plurality of times.
  • FIG. 2 is a view showing a modification of the multilayer inductor of FIG. 1, and (a) to (j) show first to tenth layers provided in the inductor section, respectively.
  • the first modification is different from the above-described example in that the inductor section includes four coil electrode layers 3 each having a coil pattern 2 formed by being wound a plurality of times. Since other configurations are the same as those in the above-described example, description of the configurations is omitted by giving the same reference numerals.
  • the electrode pattern 5a provided in the first layer L1 shown in FIG. 2A is connected to one end 2a of the coil pattern 2 included in the second layer L2 shown in FIG.
  • the electrode pattern 5b provided in L1 is connected to the other end 2b of the coil pattern 2 included in the tenth layer L10 shown in FIG.
  • Each of the coil patterns 2 shown in FIGS. 2C to 2I has one end 2a one end 2a of the lower coil pattern 2, and the other end 2b one end 2a of the upper coil pattern 2. They are connected by via holes 4.
  • the second layer L 2, the third layer L 3, the eighth layer L 8, the ninth layer L 9, the first layer L 3, the coil layer 3 on the uppermost layer side and the lowermost layer side of the inductor portion are included.
  • the number of turns of the coil pattern 2 of the coil electrode layer 3 of the 10 layer L10 is set to 1 or less.
  • the coil pattern 2 of the four coil electrode layers 3 of the fourth layer L4, the fifth layer L5, the sixth layer L6, and the seventh layer L7 is formed by being wound a plurality of times.
  • FIG. 3 is a view showing a modification of the multilayer inductor of FIG. 1, and FIGS. 3A to 3J show first to tenth layers provided in the inductor section, respectively.
  • the second modification is different from the above-described example in that the inductor section includes six coil electrode layers 3 each having a coil pattern 2 formed by being wound a plurality of times. Since other configurations are the same as those in the above-described example, description of the configurations is omitted by giving the same reference numerals.
  • the electrode pattern 5a provided in the first layer L1 shown in FIG. 3A is connected to one end 2a of the coil pattern 2 included in the second layer L2 shown in FIG.
  • the electrode pattern 5b provided in L1 is connected to the other end 2b of the coil pattern 2 included in the tenth layer L10 shown in FIG.
  • Each of the coil patterns 2 shown in FIGS. 3C to 3I has one end 2a one end 2a of the lower coil pattern 2, and the other end 2b one end 2a of the upper coil pattern 2. They are connected by via holes 4.
  • the coils of the coil electrode layers 3 of the second layer L2, the ninth layer L9, and the tenth layer L10 which include at least the coil electrode layers 3 on the uppermost layer side and the lowermost layer side of the inductor portion.
  • the number of turns of the pattern 2 is 1 or less.
  • the coil pattern 2 of the six coil electrode layers 3 of the third layer L3, the fourth layer L4, the fifth layer L5, the sixth layer L6, the seventh layer L7, and the eighth layer L8 is wound a plurality of times. Is formed.
  • FIG. 4 is a view showing a comparative example of the multilayer inductor of FIG. 1, and (a) to (j) show first to tenth layers provided in the inductor section, respectively.
  • This comparative example is different from the above-described example in that the coil electrode layer 3 is not provided in the tenth layer L10 and that all eight coil patterns 2 included in each coil electrode layer 3 have the same number of turns. It is a point formed by being wound. Since other configurations are the same as those in the above-described example, description of the configurations is omitted by giving the same reference numerals.
  • the electrode pattern 5a provided in the first layer L1 shown in FIG. 4A is connected to one end 2a of the coil pattern 2 included in the second layer L2 shown in FIG.
  • the electrode pattern 5b provided in L1 is connected to the other end 2b of the coil pattern 2 included in the ninth layer L9 shown in FIG.
  • Each of the coil patterns 2 shown in FIGS. 4C to 4I has the other end 2b of the coil pattern 2 in which the one end 2a is one lower layer and the one end 2a of the coil pattern 2 in which the other end 2b is one upper layer. They are connected by via holes 4.
  • FIG. 5 is a diagram showing the magnitude of inductance per unit length of the multilayer inductor shown in FIGS.
  • the increase rate of the inductance due to the increase in the number of turns of the coil pattern 2 and the loss due to the increase in the line length due to the connection of the coil pattern 2 by increasing the number of turns of the coil pattern 2 If the increase rate (resistance value increase rate) is compared, increasing the number of turns of the coil pattern 2 of the coil electrode layer 3 provided on the center side of the inductor portion increases the inductance of the inductor portion while increasing the resistance. Since the value further increases, the inductance per unit length is reduced.
  • the coil pattern 2 is compared with the increase rate of the resistance value by increasing the number of turns of the coil pattern 2 and increasing the line length. This is probably because the effect of increasing the inductance by increasing the number of windings is small.
  • the effect of increasing the inductance does not change much even if the number of turns of the coil pattern 2 of the coil electrode layer 3 is increased or decreased.
  • the line length of the entire coil pattern 2 connected in series in the stacking direction is reduced while maintaining the magnitude of the inductance, and the resistance value (Loss) can be reduced.
  • the plurality of magnetic layers 1 and the plurality of coil electrode layers 3 having the spiral coil pattern 2 are alternately stacked, and each coil pattern 2 is connected in a spiral shape.
  • the inductor portion is formed, and among the coil electrode layers 3 forming the inductor portion, the layer central portion of the inductor portion having a large effect of increasing inductance by forming the coil pattern 2 in a spiral shape with less magnetic leakage
  • the coil pattern 2 is spirally wound and formed to increase the inductance, while the magnetic leakage is large and the coil pattern 2 is wound and formed to have a small effect of increasing the inductance.
  • the coil pattern 2 in the center portion of the inductor portion having a large effect of increasing inductance by forming the coil pattern 2 in a spiral shape with less magnetic leakage is wound in a spiral shape. Since the inductance is increased by forming, the coil pattern 2 is obtained in order to obtain the same magnitude of inductance as compared with the case where the inductor part is formed by setting the number of turns of the coil pattern 2 of each electrode layer 3 to 1 or less. Since the number of layers 2 stacked in the layer direction can be reduced, the height of the multilayer inductor can be reduced.
  • FIG. 6 is a diagram showing the internal configuration of the second embodiment of the multilayer inductor according to the present invention.
  • This second embodiment is different from the above-described embodiment in that the number of turns of the coil pattern 2 of each coil electrode layer 3 is increased from the uppermost layer side and the lowermost layer side of the inductor portion toward the layer center side of the inductor portion. This is an increasing point. Since other configurations are the same as those in the above-described example, description of the configurations is omitted by giving the same reference numerals.
  • the electrode pattern 5a provided in the first layer L1 shown in FIG. 6A is connected to one end 2a of the coil pattern 2 included in the second layer L2 shown in FIG.
  • the electrode pattern 5b provided in L1 is connected to the other end 2b of the coil pattern 2 included in the ninth layer L9 shown in FIG.
  • Each of the coil patterns 2 shown in FIGS. 6C to 6H includes the other end 2b of the coil pattern 2 having one lower end 2a and the one end 2a of the coil pattern 2 having one upper end 2b. They are connected by via holes 4.
  • the number of turns of the coil pattern 2 of the second layer L2 and the coil electrode layer 3 of the ninth layer L9 which is the coil electrode layer 3 on the uppermost layer side and the lowermost layer side of the inductor portion is one. It is formed as follows.
  • the coil electrode layer 3 is formed by increasing the number of turns of the coil pattern 2 from the third layer L3 and the eighth layer L8 toward the center of the layer.
  • the magnetic leakage is large from the uppermost layer side and the lowermost layer side of the inductor portion where the effect of increasing the inductance by forming the coil pattern 2 in a spiral shape is small.
  • the loss is reduced. It is possible to increase the inductance more efficiently in a state where the increase in the resistance is suppressed.
  • FIG. 7 is a view showing a third embodiment of the multilayer inductor of the present invention.
  • the third embodiment is different from the above-described embodiment in that a nonmagnetic material layer 7 is further provided on both main surfaces of the above-described inductor section 6.
  • Other configurations are the same as those described above.
  • the nonmagnetic layer 7 is formed of a ceramic green sheet having a relative permeability of 1 formed of a Zn—Fe or Zn—Cu nonmagnetic material, and is laminated with the inductor portion 6 and fired simultaneously. Thus, the multilayer inductor 8 is formed.
  • the multilayer inductor 8 can be provided with a practical configuration.
  • the present invention is not limited to the above-described embodiment, and various modifications other than those described above can be made without departing from the gist of the coil pattern 2 of the coil electrode layer 3.
  • the state in which the number of windings is 1 or less is a state in which the coil pattern 2 is interrupted before making one turn as shown in FIGS. 1 (j), 3 (j), and 6 (b), or FIG. ),
  • the coil pattern 2 includes a state where both ends thereof partially overlap each other, and at least the number of turns of the coil pattern 2 on the uppermost layer side and the lowermost layer side of the inductor portion It is sufficient if it is less than the number of windings of pattern 2.
  • the number of coil electrode layers 3 having a coil pattern 2 wound a plurality of times and the number of coil electrode layers 3 having a coil pattern 2 having a number of turns of 1 or less are not limited to the above example. Instead, it may be changed as appropriate according to the relationship between the desired inductance and the resistance value.
  • the multilayer inductor of the present invention is formed as a chip-type electronic component.
  • the multilayer inductor of the present invention may be formed of a resin member or formed as a substrate-embedded electronic component.
  • the shape and material configuration can be appropriately selected according to the purpose of use of the multilayer inductor.
  • the present invention provides various multilayer inductors including an inductor unit in which a plurality of magnetic layers and a plurality of coil electrode layers having a spiral coil pattern are alternately stacked, and each coil pattern is connected in series in the stacking direction. Can be widely applied.

Abstract

Provided is a technology capable of suppressing an increase in loss while increasing inductance. Coil electrode layers (3) constitute an inductor section. In the central coil electrode layer of the inductor section, the magnetism leakage is small and an inductance increasing effect obtained by spirally forming a coil pattern (2) is large. In at least the uppermost coil electrode layer and the lowermost coil electrode layer of the inductor section, the magnetism leakage is large and the inductance increasing effect obtained by spirally forming the coil pattern (2) is small. The coil pattern (2) of the central coil electrode layer is spirally wound to increase the inductance, while the number of turns of the coil pattern (2) in each of the uppermost and lowermost coil electrode layers (3) is set to 1 or less. As a result, the entire wire length obtained by connecting the coil patterns (2) in series in the laminating direction can be reduced, making it possible to suppress the increase in loss.

Description

積層型インダクタMultilayer inductor
　本発明は、複数の磁性体層と渦巻状のコイルパターンを有する複数のコイル電極層とが交互に積層され、複数のコイル電極層の各コイルパターンが積層方向に直列接続されたインダクタ部を備える積層型インダクタに関する。 The present invention includes an inductor unit in which a plurality of magnetic layers and a plurality of coil electrode layers having a spiral coil pattern are alternately stacked, and the coil patterns of the plurality of coil electrode layers are connected in series in the stacking direction. The present invention relates to a multilayer inductor.
　従来、図８に示すように、複数の磁性体層５０１とコイルパターン５０２を有するコイル電極層５０３とが交互に積層され、コイルパターン５０２が積層方向に順次直列接続される。これにより、磁性体中で積層方向に重畳しながららせん状に周回するコイルが形成されて、形成されたコイルの両端が引出電極５０４を介して外部電極５０５に接続された積層型インダクタ５００が知られている（例えば、特許文献１参照）。このように構成すると、コイルの周囲が磁性体で囲まれていることから磁気漏洩が少なく、インダクタンスが増大する。 Conventionally, as shown in FIG. 8, a plurality of magnetic layers 501 and a coil electrode layer 503 having a coil pattern 502 are alternately stacked, and the coil patterns 502 are sequentially connected in series in the stacking direction. As a result, a coil that spirals in a magnetic material while being superimposed in the stacking direction is formed, and the multilayer inductor 500 in which both ends of the formed coil are connected to the external electrode 505 via the extraction electrode 504 is known. (For example, refer to Patent Document 1). If comprised in this way, since the circumference | surroundings of a coil are surrounded by the magnetic body, there will be little magnetic leakage and an inductance will increase.
　また、この積層型インダクタ５００では、積層方向における磁性体層５０１とコイル電極層５０３との間に非磁性体層５０６が設けられて磁性体の磁気飽和が防止されることにより、直流重畳特性の改善が図られている。なお、図８は従来の積層型インダクタの一例を示す図であって、（ａ）は外観図、（ｂ）はコイルパターン５０２の上面を示す図、（ｃ）は断面図である。 Further, in this multilayer inductor 500, a non-magnetic layer 506 is provided between the magnetic layer 501 and the coil electrode layer 503 in the stacking direction to prevent magnetic saturation of the magnetic body, so Improvements are being made. 8A and 8B are diagrams illustrating an example of a conventional multilayer inductor, in which FIG. 8A is an external view, FIG. 8B is a diagram illustrating an upper surface of the coil pattern 502, and FIG. 8C is a cross-sectional view.
特開２００６－３１８９４６号公報（段落［００１５］～［００１８］、図１など）JP 2006-318946 A (paragraphs [0015] to [0018], FIG. 1 etc.)
　ところで、積層型コンデンサ５００において、コイル電極層５０３の各コイルパターン５０２を渦巻状に巻回して形成することで磁界の強度が増しインダクタンスを増大できることが知られている。ところが、この場合、各コイルパターン５０２を渦巻状に巻回して形成することでコイルの線路長が長くなるので等価直列抵抗（ＥＳＲ）が増大し損失が大きくなることが問題となっていた。 Incidentally, it is known that in the multilayer capacitor 500, each coil pattern 502 of the coil electrode layer 503 is formed by being spirally wound to increase the strength of the magnetic field and increase the inductance. However, in this case, since each coil pattern 502 is formed in a spiral shape to increase the line length of the coil, the equivalent series resistance (ESR) increases and the loss increases.
　この発明は、上記した課題に鑑みてなされたものであり、インダクタンスを増大しつつ損失の増大を抑制することができる技術を提供することを目的とする。 The present invention has been made in view of the above-described problems, and an object thereof is to provide a technique capable of suppressing an increase in loss while increasing an inductance.
　上記した目的を達成するために、複数の磁性体層と渦巻状のコイルパターンを有する複数のコイル電極層とが交互に積層され、前記各コイルパターンが積層方向に直列接続されたインダクタ部を備える積層型インダクタにおいて、前記各コイル電極層のうち、少なくとも前記インダクタ部の最上層側および最下層側の前記コイル電極層の前記コイルパターンの巻回数が、前記インダクタ部の層中央側の前記コイルパターンの巻回数よりも少ないことを特徴としている（請求項１）。 In order to achieve the above-described object, a plurality of magnetic layers and a plurality of coil electrode layers having a spiral coil pattern are alternately stacked, and an inductor unit is provided in which the coil patterns are connected in series in the stacking direction. In the multilayer inductor, the number of turns of the coil pattern of at least the uppermost layer side and the lowermost layer side of the inductor portion among the coil electrode layers is equal to the coil pattern on the layer center side of the inductor portion. The number of turns is less than the number of turns (claim 1).
　また、前記各コイル電極層のうち、少なくとも前記インダクタ部の最上層側および最下層側の前記コイル電極層の前記コイルパターンの巻回数が１以下であるとよい（請求項２）。 Also, it is preferable that the number of turns of the coil pattern of at least the uppermost layer side and the lowermost layer side of the inductor portion among the coil electrode layers is 1 or less (Claim 2).
　また、前記各コイル電極層の前記コイルパターンの巻回数は、前記インダクタ部の最上層側および最下層側から前記インダクタ部の層中央側に向かうに連れて増大していてもよい（請求項３）。 In addition, the number of turns of the coil pattern of each coil electrode layer may increase from the uppermost layer side and the lowermost layer side of the inductor portion toward the layer center side of the inductor portion. ).
　また、前記インダクタ部の両主面に設けられた非磁性体層をさらに備えているとよい（請求項４）。 Further, it is preferable to further include nonmagnetic layers provided on both main surfaces of the inductor portion.
　請求項１の発明によれば、複数の磁性体層と渦巻状のコイルパターンを有する複数のコイル電極層とが交互に積層され、各コイルパターンが積層方向に直列接続されてインダクタ部が形成されている。インダクタ部を形成する各コイル電極層のうち、磁気漏洩が少なく、コイルパターンを渦巻状に形成することによるインダクタンス増大の効果の大きいインダクタ部の層中央部分のコイルパターンを渦巻状に巻回して形成することによりインダクタ部のインダクタンスを増大させつつ、磁気漏洩が大きくコイルパターンを渦巻状に巻回して形成することによるインダクタンス増大の効果の小さい、少なくともインダクタ部の最上層側および最下層側のコイル電極層のコイルパターンの巻回数を、インダクタ部の層中央側のコイルパターンの巻回数よりも少なくすることにより、各コイルパターンが積層方向に直列接続されたときのコイル電極層全体の線路長を短くすることができる。このため、損失が増大するのを抑制することができる。 According to the first aspect of the present invention, a plurality of magnetic layers and a plurality of coil electrode layers having a spiral coil pattern are alternately stacked, and each coil pattern is connected in series in the stacking direction to form an inductor portion. ing. Of each coil electrode layer that forms the inductor part, the coil pattern in the center part of the inductor part is formed in a spiral shape with little magnetic leakage and a large effect of increasing the inductance by forming the coil pattern in a spiral shape The coil electrodes on the uppermost layer side and the lowermost layer side of at least the inductor portion, which increase the inductance of the inductor portion and have a large magnetic leakage and a small effect of increasing the inductance by winding the coil pattern in a spiral shape. By making the number of turns of the coil pattern of the layer smaller than the number of turns of the coil pattern on the center side of the inductor part, the line length of the entire coil electrode layer when each coil pattern is connected in series in the stacking direction is shortened. can do. For this reason, it can suppress that loss increases.
　請求項２の発明によれば、磁気漏洩が大きくコイルパターンを渦巻状に巻回して形成することによるインダクタンス増大の効果の小さい、少なくともインダクタ部の最上層側および最下層側のコイル電極層のコイルパターンの巻回数を１以下とすることにより、各コイルパターンが積層方向に直列接続されたときのコイル電極層全体の線路長をより一層短くすることができるため、損失が増大するのをより効率よく抑制することができる。 According to the invention of claim 2, at least the coil of the coil electrode layer on the uppermost layer side and the lowermost layer side of the inductor portion, which has a large magnetic leakage and has a small effect of increasing the inductance due to the coil pattern wound in a spiral shape. By setting the number of turns of the pattern to 1 or less, the line length of the entire coil electrode layer when the coil patterns are connected in series in the stacking direction can be further shortened, so that the loss is more efficiently increased. It can be well suppressed.
　請求項３の発明によれば、磁気漏洩が大きくコイルパターンを渦巻状に巻回して形成することによるインダクタンス増大の効果の小さいインダクタ部の最上層側および最下層側から、磁気漏洩が少なくコイルパターンを渦巻状に形成することによるインダクタンス増大の効果の大きいインダクタ部の層中央側に向かうに連れて、各コイル電極層のコイルパターンの巻回数を増大することにより、損失が増大するのを抑制した状態でより効率よくインダクタンスを増大することができる。 According to the third aspect of the present invention, there is less magnetic leakage from the uppermost layer side and the lowermost layer side of the inductor portion, which has a large magnetic leakage and has a small effect of increasing the inductance by forming the coil pattern in a spiral shape. By increasing the number of turns of the coil pattern of each coil electrode layer, the increase in the loss was suppressed as it moved toward the center side of the inductor part, which had a large effect of increasing the inductance by forming the coil in a spiral shape. The inductance can be increased more efficiently in the state.
　請求項４の発明によれば、インダクタ部の両主面に非磁性体層を設けることにより、実用的な構成で積層型インダクタを提供することができる。 According to the invention of claim 4, a multilayer inductor can be provided with a practical configuration by providing non-magnetic layers on both main surfaces of the inductor section.
本発明の積層型インダクタの第１実施形態の内部構成を示す図である。It is a figure which shows the internal structure of 1st Embodiment of the multilayer inductor of this invention. 図１の積層型インダクタの変形例を示す図である。FIG. 6 is a diagram illustrating a modification of the multilayer inductor of FIG. 1. 図１の積層型インダクタの変形例を示す図である。FIG. 6 is a diagram illustrating a modification of the multilayer inductor of FIG. 1. 本発明の積層型インダクタの比較例を示す図である。It is a figure which shows the comparative example of the multilayer inductor of this invention. 本発明の積層型インダクの単位長さあたりのインダクタンスの大きさを示す図である。It is a figure which shows the magnitude | size of the inductance per unit length of the laminated type inductor of this invention. 本発明の積層型インダクタの第２実施形態の内部構成を示す図である。It is a figure which shows the internal structure of 2nd Embodiment of the multilayer inductor of this invention. 本発明の積層型インダクタの第３実施形態の一部断面図である。It is a partial cross section figure of 3rd Embodiment of the multilayer inductor of this invention. 従来の積層型インダクタの一例を示す図である。It is a figure which shows an example of the conventional multilayer inductor.
　＜第１実施形態＞
　本発明の積層型インダクタの第１実施形態について、図１を参照して説明する。図１は本発明の積層型インダクタの第１実施形態の内部構成を示す図であり、（ａ）～（ｊ）はそれぞれインダクタ部が備える第１～第１０レイヤを示す。 <First Embodiment>
A first embodiment of a multilayer inductor according to the present invention will be described with reference to FIG. FIG. 1 is a diagram showing an internal configuration of a first embodiment of a multilayer inductor according to the present invention, and FIGS.
　図１に示す積層型インダクタは、ＤＣ－ＤＣコンバータなどに使用されるものであり、複数の磁性体層１と渦巻状のコイルパターン２を有する複数のコイル電極層３とが交互に積層され、各コイルパターン２が層間接続用のビア孔４（ビア導体）により積層方向に直列接続されたインダクタ部を備えている。 The multilayer inductor shown in FIG. 1 is used for a DC-DC converter or the like, in which a plurality of magnetic layers 1 and a plurality of coil electrode layers 3 having a spiral coil pattern 2 are alternately stacked, Each coil pattern 2 includes an inductor portion connected in series in the stacking direction by via holes 4 (via conductors) for interlayer connection.
　インダクタ部は、磁性体層１に電極パターン５ａ，５ｂにより形成された外部接続電極層が設けられた第１レイヤＬ１と、磁性体層１にコイルパターン２が渦巻状に巻回して形成されたコイル電極層３が設けられた第２レイヤＬ２～第１０レイヤＬ１０とを備えている。また、各レイヤＬ１～Ｌ１０は、Ｎｉ－Ｚｎ－Ｆｅ系やＮｉ－Ｚｎ－Ｃｕ系などの磁性体材料により形成されたセラミックシートに、ＡｇやＡｇ－ＰｄなどのＡｇ合金、Ｃｕなどの導体ペーストにより所定の電極パターン５ａ，５ｂおよびコイルパターン２が印刷されて形成される。 The inductor part is formed by winding the coil pattern 2 around the magnetic layer 1 in a spiral shape, and the first layer L1 provided with the external connection electrode layer formed of the electrode patterns 5a and 5b on the magnetic layer 1. The second layer L2 to the tenth layer L10 provided with the coil electrode layer 3 are provided. Each of the layers L1 to L10 is made of a ceramic sheet formed of a magnetic material such as Ni—Zn—Fe or Ni—Zn—Cu, an Ag alloy such as Ag or Ag—Pd, or a conductor paste such as Cu. Thus, predetermined electrode patterns 5a and 5b and coil pattern 2 are printed and formed.
　また、各レイヤＬ１～Ｌ１０には、レーザなどでビアホールが形成され、内部に導体ペーストを充填することにより層間接続用のビア孔４（ビア導体）が形成されて、第１レイヤＬ１～第１０レイヤＬ１０の順に積層されて低温で焼成されて形成されることによりインダクタ部（積層型インダクタ）が形成される。 Further, via holes are formed in each of the layers L1 to L10 by a laser or the like, and via holes 4 (via conductors) for interlayer connection are formed by filling the inside with a conductive paste, and the first layers L1 to L10 are formed. By laminating layers L10 in this order and firing at a low temperature, an inductor part (laminated inductor) is formed.
　図１（ａ）に示す第１レイヤＬ１に設けられた電極パターン５ａは、同図（ｂ）に示す第２レイヤＬ２が有するコイルパターン２の一端２ａとビア孔４により接続され、第１レイヤＬ１に設けられた電極パターン５ｂは、同図（ｊ）に示す第１０レイヤＬ１０が有するコイルパターン２の他端２ｂとビア孔４により接続される。 The electrode pattern 5a provided in the first layer L1 shown in FIG. 1A is connected to one end 2a of the coil pattern 2 included in the second layer L2 shown in FIG. The electrode pattern 5b provided in L1 is connected to the other end 2b of the coil pattern 2 included in the tenth layer L10 shown in FIG.
　また、図１（ｃ）～（ｉ）に示す各コイルパターン２は、一端２ａが１つ下層のコイルパターン２の他端２ｂと、他端２ｂが１つ上層のコイルパターン２の一端２ａとビア孔４により接続される。 Each of the coil patterns 2 shown in FIGS. 1C to 1I has one end 2a one end 2a of the lower coil pattern 2, and the other end 2b one end 2a of the upper coil pattern 2. They are connected by via holes 4.
　また、各コイル電極層３のうち、少なくともインダクタ部の最上層側および最下層側のコイル電極層３を含む、第２レイヤＬ２、第３レイヤＬ３、第４レイヤＬ４、第７レイヤＬ７、第８レイヤＬ８、第９レイヤＬ９、第１０レイヤＬ１０のコイル電極層３のコイルパターン２の巻回数が１以下に形成されている。また、第５レイヤＬ５、第６レイヤＬ６の２層のコイル電極層３のコイルパターン２は複数回巻回されて形成されている。 In addition, among the coil electrode layers 3, the second layer L2, the third layer L3, the fourth layer L4, the seventh layer L7, the first layer L2, the coil layer 3 on the uppermost layer side and the lowermost layer side of the inductor portion are included. The number of turns of the coil pattern 2 of the coil electrode layer 3 of the eighth layer L8, the ninth layer L9, and the tenth layer L10 is 1 or less. The coil pattern 2 of the two coil electrode layers 3 of the fifth layer L5 and the sixth layer L6 is formed by being wound a plurality of times.
　（第１変形例）
　次に、本発明の積層型インダクタの第１変形例について説明する。図２は図１の積層型インダクタの変形例を示す図であって、（ａ）～（ｊ）はそれぞれインダクタ部が備える第１～第１０レイヤを示す。この第１変形例が上記した例と異なる点は、インダクタ部が、複数回巻回されて形成されたコイルパターン２を有するコイル電極層３を４層備えている点である。その他の構成は上記した例と同様であるため、同一符号を付すことによりその構成の説明は省略する。 (First modification)
Next, a first modification of the multilayer inductor of the present invention will be described. FIG. 2 is a view showing a modification of the multilayer inductor of FIG. 1, and (a) to (j) show first to tenth layers provided in the inductor section, respectively. The first modification is different from the above-described example in that the inductor section includes four coil electrode layers 3 each having a coil pattern 2 formed by being wound a plurality of times. Since other configurations are the same as those in the above-described example, description of the configurations is omitted by giving the same reference numerals.
　図２（ａ）に示す第１レイヤＬ１に設けられた電極パターン５ａは、同図（ｂ）に示す第２レイヤＬ２が有するコイルパターン２の一端２ａとビア孔４により接続され、第１レイヤＬ１に設けられた電極パターン５ｂは、同図（ｊ）に示す第１０レイヤＬ１０が有するコイルパターン２の他端２ｂとビア孔４により接続される。 The electrode pattern 5a provided in the first layer L1 shown in FIG. 2A is connected to one end 2a of the coil pattern 2 included in the second layer L2 shown in FIG. The electrode pattern 5b provided in L1 is connected to the other end 2b of the coil pattern 2 included in the tenth layer L10 shown in FIG.
　また、図２（ｃ）～（ｉ）に示す各コイルパターン２は、一端２ａが１つ下層のコイルパターン２の他端２ｂと、他端２ｂが１つ上層のコイルパターン２の一端２ａとビア孔４により接続される。 Each of the coil patterns 2 shown in FIGS. 2C to 2I has one end 2a one end 2a of the lower coil pattern 2, and the other end 2b one end 2a of the upper coil pattern 2. They are connected by via holes 4.
　また、各コイル電極層３のうち、少なくともインダクタ部の最上層側および最下層側のコイル電極層３を含む、第２レイヤＬ２、第３レイヤＬ３、第８レイヤＬ８、第９レイヤＬ９、第１０レイヤＬ１０のコイル電極層３のコイルパターン２の巻回数が１以下に形成されている。また、第４レイヤＬ４、第５レイヤＬ５、第６レイヤＬ６、第７レイヤＬ７の４層のコイル電極層３のコイルパターン２は複数回巻回されて形成されている。 In addition, among the coil electrode layers 3, the second layer L 2, the third layer L 3, the eighth layer L 8, the ninth layer L 9, the first layer L 3, the coil layer 3 on the uppermost layer side and the lowermost layer side of the inductor portion are included. The number of turns of the coil pattern 2 of the coil electrode layer 3 of the 10 layer L10 is set to 1 or less. The coil pattern 2 of the four coil electrode layers 3 of the fourth layer L4, the fifth layer L5, the sixth layer L6, and the seventh layer L7 is formed by being wound a plurality of times.
　（第２変形例）
　次に、本発明の積層型インダクタの第２変形例について説明する。図３は図１の積層型インダクタの変形例を示す図であって、（ａ）～（ｊ）はそれぞれインダクタ部が備える第１～第１０レイヤを示す。この第２変形例が上記した例と異なる点は、インダクタ部が、複数回巻回されて形成されたコイルパターン２を有するコイル電極層３を６層備えている点である。その他の構成は上記した例と同様であるため、同一符号を付すことによりその構成の説明は省略する。 (Second modification)
Next, a second modification of the multilayer inductor according to the present invention will be described. FIG. 3 is a view showing a modification of the multilayer inductor of FIG. 1, and FIGS. 3A to 3J show first to tenth layers provided in the inductor section, respectively. The second modification is different from the above-described example in that the inductor section includes six coil electrode layers 3 each having a coil pattern 2 formed by being wound a plurality of times. Since other configurations are the same as those in the above-described example, description of the configurations is omitted by giving the same reference numerals.
　図３（ａ）に示す第１レイヤＬ１に設けられた電極パターン５ａは、同図（ｂ）に示す第２レイヤＬ２が有するコイルパターン２の一端２ａとビア孔４により接続され、第１レイヤＬ１に設けられた電極パターン５ｂは、同図（ｊ）に示す第１０レイヤＬ１０が有するコイルパターン２の他端２ｂとビア孔４により接続される。 The electrode pattern 5a provided in the first layer L1 shown in FIG. 3A is connected to one end 2a of the coil pattern 2 included in the second layer L2 shown in FIG. The electrode pattern 5b provided in L1 is connected to the other end 2b of the coil pattern 2 included in the tenth layer L10 shown in FIG.
　また、図３（ｃ）～（ｉ）に示す各コイルパターン２は、一端２ａが１つ下層のコイルパターン２の他端２ｂと、他端２ｂが１つ上層のコイルパターン２の一端２ａとビア孔４により接続される。 Each of the coil patterns 2 shown in FIGS. 3C to 3I has one end 2a one end 2a of the lower coil pattern 2, and the other end 2b one end 2a of the upper coil pattern 2. They are connected by via holes 4.
　また、各コイル電極層３のうち、少なくともインダクタ部の最上層側および最下層側のコイル電極層３を含む、第２レイヤＬ２、第９レイヤＬ９、第１０レイヤＬ１０のコイル電極層３のコイルパターン２の巻回数が１以下に形成されている。また、第３レイヤＬ３、第４レイヤＬ４、第５レイヤＬ５、第６レイヤＬ６、第７レイヤＬ７、第８レイヤＬ８の６層のコイル電極層３のコイルパターン２は複数回巻回されて形成されている。 Further, among the coil electrode layers 3, the coils of the coil electrode layers 3 of the second layer L2, the ninth layer L9, and the tenth layer L10, which include at least the coil electrode layers 3 on the uppermost layer side and the lowermost layer side of the inductor portion. The number of turns of the pattern 2 is 1 or less. The coil pattern 2 of the six coil electrode layers 3 of the third layer L3, the fourth layer L4, the fifth layer L5, the sixth layer L6, the seventh layer L7, and the eighth layer L8 is wound a plurality of times. Is formed.
　（比較例）
　次に、本発明の積層型インダクタの比較例について説明する。図４は図１の積層型インダクタの比較例を示す図であって、（ａ）～（ｊ）はそれぞれインダクタ部が備える第１～第１０レイヤを示す。この比較例が上記した例と異なる点は、第１０レイヤＬ１０にコイル電極層３が設けられていない点と、各コイル電極層３が有する８層すべてのコイルパターン２が同じ巻回数で複数回巻回されて形成されている点である。その他の構成は上記した例と同様であるため、同一符号を付すことによりその構成の説明は省略する。 (Comparative example)
Next, a comparative example of the multilayer inductor of the present invention will be described. FIG. 4 is a view showing a comparative example of the multilayer inductor of FIG. 1, and (a) to (j) show first to tenth layers provided in the inductor section, respectively. This comparative example is different from the above-described example in that the coil electrode layer 3 is not provided in the tenth layer L10 and that all eight coil patterns 2 included in each coil electrode layer 3 have the same number of turns. It is a point formed by being wound. Since other configurations are the same as those in the above-described example, description of the configurations is omitted by giving the same reference numerals.
　図４（ａ）に示す第１レイヤＬ１に設けられた電極パターン５ａは、同図（ｂ）に示す第２レイヤＬ２が有するコイルパターン２の一端２ａとビア孔４により接続され、第１レイヤＬ１に設けられた電極パターン５ｂは、同図（ｊ）に示す第９レイヤＬ９が有するコイルパターン２の他端２ｂとビア孔４により接続される。 The electrode pattern 5a provided in the first layer L1 shown in FIG. 4A is connected to one end 2a of the coil pattern 2 included in the second layer L2 shown in FIG. The electrode pattern 5b provided in L1 is connected to the other end 2b of the coil pattern 2 included in the ninth layer L9 shown in FIG.
　また、図４（ｃ）～（ｉ）に示す各コイルパターン２は、一端２ａが１つ下層のコイルパターン２の他端２ｂと、他端２ｂが１つ上層のコイルパターン２の一端２ａとビア孔４により接続される。 Each of the coil patterns 2 shown in FIGS. 4C to 4I has the other end 2b of the coil pattern 2 in which the one end 2a is one lower layer and the one end 2a of the coil pattern 2 in which the other end 2b is one upper layer. They are connected by via holes 4.
　（インダクタンスの大きさと抵抗値との関係）
　次に、コイルパターン２の巻回数によるインダクタンスの大きさと抵抗値との関係について図５を参照して説明する。図５は図１～図４に示す積層型インダクタの単位長さあたりのインダクタンスの大きさを示す図である。 (Relationship between inductance and resistance)
Next, the relationship between the magnitude of the inductance and the resistance value depending on the number of turns of the coil pattern 2 will be described with reference to FIG. FIG. 5 is a diagram showing the magnitude of inductance per unit length of the multilayer inductor shown in FIGS.
　図５に示すように、コイルパターン２の巻回数を増やすことによるインダクタンスの増大率と、コイルパターン２の巻回数を増やしてコイルパターン２が接続されることによる線路長の増大に起因した損失の増大率（抵抗値の増大率）とを比較すれば、インダクタ部の層中央側に設けられたコイル電極層３のコイルパターン２の巻回数を増やせば、インダクタ部のインダクタンスが増大する一方で抵抗値がさらに増大するため、単位長さあたりのインダクタンスは小さくなる。これは、インダクタ部の最上層側および最下層側では、磁気漏洩が大きいため、コイルパターン２の巻回数を増やして線路長が長くなることによる抵抗値の増大率と比較すれば、コイルパターン２の巻回数を増やすことによるインダクタンスを増大させる効果が小さいためであると考えられる。 As shown in FIG. 5, the increase rate of the inductance due to the increase in the number of turns of the coil pattern 2 and the loss due to the increase in the line length due to the connection of the coil pattern 2 by increasing the number of turns of the coil pattern 2 If the increase rate (resistance value increase rate) is compared, increasing the number of turns of the coil pattern 2 of the coil electrode layer 3 provided on the center side of the inductor portion increases the inductance of the inductor portion while increasing the resistance. Since the value further increases, the inductance per unit length is reduced. This is because the magnetic leakage is large on the uppermost layer side and the lowermost layer side of the inductor portion, and the coil pattern 2 is compared with the increase rate of the resistance value by increasing the number of turns of the coil pattern 2 and increasing the line length. This is probably because the effect of increasing the inductance by increasing the number of windings is small.
　したがって、磁気漏洩の大きいインダクタ部の最上層側および最下層側では、コイル電極層３のコイルパターン２の巻回数を増やしても減らしても、インダクタンスを増大させる効果があまり変わらないため、インダクタ部の最上層側および最下層側ではコイルパターン２の巻回数を減らすことで、インダクタンスの大きさを維持した状態で積層方向に直列接続されるコイルパターン２全体の線路長を短くして、抵抗値（損失）を低減することができる。 Therefore, on the uppermost layer side and the lowermost layer side of the inductor portion where the magnetic leakage is large, the effect of increasing the inductance does not change much even if the number of turns of the coil pattern 2 of the coil electrode layer 3 is increased or decreased. By reducing the number of turns of the coil pattern 2 on the uppermost layer side and the lowermost layer side, the line length of the entire coil pattern 2 connected in series in the stacking direction is reduced while maintaining the magnitude of the inductance, and the resistance value (Loss) can be reduced.
　以上のように、上記した実施形態によれば、複数の磁性体層１と渦巻状のコイルパターン２を有する複数のコイル電極層３とが交互に積層され、各コイルパターン２がらせん状に接続されてインダクタ部が形成されており、インダクタ部を形成する各コイル電極層３のうち、磁気漏洩が少なくコイルパターン２を渦巻状に形成することによるインダクタンス増大の効果の大きいインダクタ部の層中央部分のコイルパターン２を渦巻状に巻回して形成することによりインダクタンスを増大しつつ、磁気漏洩が大きくコイルパターン２を渦巻状に巻回して形成することによるインダクタンス増大の効果の小さい、少なくともインダクタ部の最上層側および最下層側のコイル電極層３のコイルパターン２の巻回数を１以下とすることにより、各コイルパターン２がらせん状に接続されることによる全体の線路長を短くすることができるため、損失が増大するのを抑制することができる。 As described above, according to the above-described embodiment, the plurality of magnetic layers 1 and the plurality of coil electrode layers 3 having the spiral coil pattern 2 are alternately stacked, and each coil pattern 2 is connected in a spiral shape. The inductor portion is formed, and among the coil electrode layers 3 forming the inductor portion, the layer central portion of the inductor portion having a large effect of increasing inductance by forming the coil pattern 2 in a spiral shape with less magnetic leakage The coil pattern 2 is spirally wound and formed to increase the inductance, while the magnetic leakage is large and the coil pattern 2 is wound and formed to have a small effect of increasing the inductance. By setting the number of turns of the coil pattern 2 of the coil electrode layer 3 on the uppermost layer side and the lowermost layer side to 1 or less, each coil It is possible to Le pattern 2 is shorter line length of the whole by being connected to a spiral, it is possible to prevent the loss increases.
　また、上記した実施形態の積層型インダクタでは、磁気漏洩が少なくコイルパターン２を渦巻状に形成することによるインダクタンス増大の効果の大きいインダクタ部の層中央部分のコイルパターン２を渦巻状に巻回して形成することによりインダクタンスを増大しているため、各電極層３が有するコイルパターン２の巻回数をすべて１以下としてインダクタ部を形成する場合と比べると、同じ大きさのインダクタンスを得るためにコイルパターン２を層方向に重畳して積層する数を減らすことができるので、積層型インダクタの低背化を図ることができる。 Further, in the multilayer inductor according to the above-described embodiment, the coil pattern 2 in the center portion of the inductor portion having a large effect of increasing inductance by forming the coil pattern 2 in a spiral shape with less magnetic leakage is wound in a spiral shape. Since the inductance is increased by forming, the coil pattern 2 is obtained in order to obtain the same magnitude of inductance as compared with the case where the inductor part is formed by setting the number of turns of the coil pattern 2 of each electrode layer 3 to 1 or less. Since the number of layers 2 stacked in the layer direction can be reduced, the height of the multilayer inductor can be reduced.
　＜第２実施形態＞
　本発明の積層型インダクタの第２実施形態について、図６を参照して説明する。図６は本発明の積層型インダクタの第２実施形態の内部構成を示す図であり、（ａ）～（ｉ）はそれぞれインダクタ部が備える第１～第９レイヤを示す。 Second Embodiment
A second embodiment of the multilayer inductor of the present invention will be described with reference to FIG. FIG. 6 is a diagram showing the internal configuration of the second embodiment of the multilayer inductor according to the present invention, and FIGS.
　この第２実施形態が上記した実施形態と異なる点は、各コイル電極層３のコイルパターン２の巻回数が、インダクタ部の最上層側および最下層側からインダクタ部の層中央側に向かうに連れて増大している点である。その他の構成は上記した例と同様であるため、同一符号を付すことによりその構成の説明は省略する。 This second embodiment is different from the above-described embodiment in that the number of turns of the coil pattern 2 of each coil electrode layer 3 is increased from the uppermost layer side and the lowermost layer side of the inductor portion toward the layer center side of the inductor portion. This is an increasing point. Since other configurations are the same as those in the above-described example, description of the configurations is omitted by giving the same reference numerals.
　図６（ａ）に示す第１レイヤＬ１に設けられた電極パターン５ａは、同図（ｂ）に示す第２レイヤＬ２が有するコイルパターン２の一端２ａとビア孔４により接続され、第１レイヤＬ１に設けられた電極パターン５ｂは、同図（ｉ）に示す第９レイヤＬ９が有するコイルパターン２の他端２ｂとビア孔４により接続される。 The electrode pattern 5a provided in the first layer L1 shown in FIG. 6A is connected to one end 2a of the coil pattern 2 included in the second layer L2 shown in FIG. The electrode pattern 5b provided in L1 is connected to the other end 2b of the coil pattern 2 included in the ninth layer L9 shown in FIG.
　また、図６（ｃ）～（ｈ）に示す各コイルパターン２は、一端２ａが１つ下層のコイルパターン２の他端２ｂと、他端２ｂが１つ上層のコイルパターン２の一端２ａとビア孔４により接続される。 Each of the coil patterns 2 shown in FIGS. 6C to 6H includes the other end 2b of the coil pattern 2 having one lower end 2a and the one end 2a of the coil pattern 2 having one upper end 2b. They are connected by via holes 4.
　また、各コイル電極層３のうち、インダクタ部の最上層側および最下層側のコイル電極層３である第２レイヤＬ２、第９レイヤＬ９のコイル電極層３のコイルパターン２の巻回数が１以下に形成されている。また、第３レイヤＬ３および第８レイヤＬ８から層中央側に向かうに連れてコイルパターン２の巻回数を増大してコイル電極層３が形成されている。 Further, among the coil electrode layers 3, the number of turns of the coil pattern 2 of the second layer L2 and the coil electrode layer 3 of the ninth layer L9 which is the coil electrode layer 3 on the uppermost layer side and the lowermost layer side of the inductor portion is one. It is formed as follows. The coil electrode layer 3 is formed by increasing the number of turns of the coil pattern 2 from the third layer L3 and the eighth layer L8 toward the center of the layer.
　以上のように、この実施形態によれば、磁気漏洩が大きくコイルパターン２を渦巻状に巻回して形成することによるインダクタンス増大の効果の小さいインダクタ部の最上層側および最下層側から、磁気漏洩が少なくコイルパターン２を渦巻状に形成することによるインダクタンス増大の効果の大きいインダクタ部の層中央側に向かうに連れて、各コイル電極層３のコイルパターン２の巻回数を増大することにより、損失が増大するのを抑制した状態でより効率よくインダクタンスを増大することができる。 As described above, according to this embodiment, the magnetic leakage is large from the uppermost layer side and the lowermost layer side of the inductor portion where the effect of increasing the inductance by forming the coil pattern 2 in a spiral shape is small. By increasing the number of turns of the coil pattern 2 of each coil electrode layer 3 toward the center side of the inductor portion, which has a large effect of increasing inductance by forming the coil pattern 2 in a spiral shape, the loss is reduced. It is possible to increase the inductance more efficiently in a state where the increase in the resistance is suppressed.
　＜第３実施形態＞
　本発明の積層型インダクタの第３実施形態について、図７を参照して説明する。図７は本発明の積層型インダクタの第３実施形態を示す図である。この第３実施形態が上記した実施形態と異なる点は、上記したインダクタ部６の両主面に非磁性体層７がさらに設けられている点である。その他の構成は上記した例と同様である。 <Third Embodiment>
A third embodiment of the multilayer inductor of the present invention will be described with reference to FIG. FIG. 7 is a view showing a third embodiment of the multilayer inductor of the present invention. The third embodiment is different from the above-described embodiment in that a nonmagnetic material layer 7 is further provided on both main surfaces of the above-described inductor section 6. Other configurations are the same as those described above.
　非磁性体層７は、Ｚｎ－Ｆｅ系やＺｎ－Ｃｕ系の非磁性体材料により形成されて比透磁率が１のセラミックグリーンシートにより形成され、インダクタ部６と積層されて同時焼成されることにより積層型インダクタ８が形成される。 The nonmagnetic layer 7 is formed of a ceramic green sheet having a relative permeability of 1 formed of a Zn—Fe or Zn—Cu nonmagnetic material, and is laminated with the inductor portion 6 and fired simultaneously. Thus, the multilayer inductor 8 is formed.
　このように、インダクタ部６の両主面に非磁性体層７を設けることにより、実用的な構成で積層型インダクタ８を提供することができる。 Thus, by providing the nonmagnetic material layer 7 on both main surfaces of the inductor section 6, the multilayer inductor 8 can be provided with a practical configuration.
　なお、本発明は上記した実施形態に限定されるものではなく、その趣旨を逸脱しない限りにおいて、上記したもの以外に種々の変更を行なうことが可能であり、コイル電極層３のコイルパターン２の巻回数が１以下である状態は、図１（ｊ）、図３（ｊ）、図６（ｂ）に示すように、コイルパターン２が１周する前に途切れた状態や、図６（ｉ）に示すように、コイルパターン２の両端が部分的に重なっている状態を含み、少なくともインダクタ部の最上層側および最下層側のコイルパターン２の巻回数が、インダクタ部の層中央側のコイルパターン２の巻回数よりも少なければよい。 The present invention is not limited to the above-described embodiment, and various modifications other than those described above can be made without departing from the gist of the coil pattern 2 of the coil electrode layer 3. The state in which the number of windings is 1 or less is a state in which the coil pattern 2 is interrupted before making one turn as shown in FIGS. 1 (j), 3 (j), and 6 (b), or FIG. ), The coil pattern 2 includes a state where both ends thereof partially overlap each other, and at least the number of turns of the coil pattern 2 on the uppermost layer side and the lowermost layer side of the inductor portion It is sufficient if it is less than the number of windings of pattern 2.
　また、複数回巻回されたコイルパターン２を有するコイル電極層３の数と、巻回数が１以下であるコイルパターン２を有するコイル電極層３の数とは、上記した例に限られるものではなく、目的とするインダクタンスの大きさと抵抗値との関係に応じて、適宜、変更すればよい。 Further, the number of coil electrode layers 3 having a coil pattern 2 wound a plurality of times and the number of coil electrode layers 3 having a coil pattern 2 having a number of turns of 1 or less are not limited to the above example. Instead, it may be changed as appropriate according to the relationship between the desired inductance and the resistance value.
　また、上記した実施形態では、本発明の積層型インダクタをチップ型の電子部品として形成したが、本発明の積層型インダクタを樹脂部材により形成したり、基板内蔵型の電子部品として形成してもよく、積層型インダクタの使用目的に応じて、適宜、形状や材料構成を選択することができる。 In the above-described embodiment, the multilayer inductor of the present invention is formed as a chip-type electronic component. However, the multilayer inductor of the present invention may be formed of a resin member or formed as a substrate-embedded electronic component. The shape and material configuration can be appropriately selected according to the purpose of use of the multilayer inductor.
　本発明は、複数の磁性体層と渦巻状のコイルパターンを有する複数のコイル電極層とが交互に積層され、各コイルパターンが積層方向に直列接続されたインダクタ部を備える種々の積層型インダクタに広く適用することができる。 The present invention provides various multilayer inductors including an inductor unit in which a plurality of magnetic layers and a plurality of coil electrode layers having a spiral coil pattern are alternately stacked, and each coil pattern is connected in series in the stacking direction. Can be widely applied.
　１　　磁性体層
　２　　コイルパターン
　３　　コイル電極層
　６　　インダクタ部
　７　　非磁性体層
　８　　積層型インダクタ DESCRIPTION OF SYMBOLS 1 Magnetic material layer 2 Coil pattern 3 Coil electrode layer 6 Inductor part 7 Nonmagnetic material layer 8 Multilayer inductor

Claims (4)

  1. 　複数の磁性体層と渦巻状のコイルパターンを有する複数のコイル電極層とが交互に積層され、前記各コイルパターンが積層方向に直列接続されたインダクタ部を備える積層型インダクタにおいて、
    　前記各コイル電極層のうち、少なくとも前記インダクタ部の最上層側および最下層側の前記コイル電極層の前記コイルパターンの巻回数が、前記インダクタ部の層中央側の前記コイルパターンの巻回数よりも少ないことを特徴とする積層型インダクタ。     In a multilayer inductor comprising a plurality of magnetic layers and a plurality of coil electrode layers having a spiral coil pattern, and an inductor portion in which the coil patterns are connected in series in the stacking direction.
    Among the coil electrode layers, at least the number of turns of the coil pattern of the coil electrode layer on the uppermost layer side and the lowermost layer side of the inductor part is larger than the number of turns of the coil pattern on the center side of the layer of the inductor part. Multilayer inductor characterized by few.
  2. 　前記各コイル電極層のうち、少なくとも前記インダクタ部の最上層側および最下層側の前記コイル電極層の前記コイルパターンの巻回数が１以下であることを特徴とする請求項１に記載の積層型インダクタ。 2. The multilayer type according to claim 1, wherein among the coil electrode layers, the number of turns of the coil pattern of at least the coil electrode layer on the uppermost layer side and the lowermost layer side of the inductor portion is 1 or less. Inductor.
  3. 　前記各コイル電極層の前記コイルパターンの巻回数は、前記インダクタ部の最上層側および最下層側から前記インダクタ部の層中央側に向かうに連れて増大していることを特徴とする請求項１または２に記載の積層型インダクタ。 2. The number of turns of the coil pattern of each coil electrode layer increases from the uppermost layer side and the lowermost layer side of the inductor portion toward the layer center side of the inductor portion. Or the multilayer inductor according to 2;
  4. 　前記インダクタ部の両主面に設けられた非磁性体層をさらに備えることを特徴とする請求項１ないし３のいずれかに記載の積層型インダクタ。 The multilayer inductor according to any one of claims 1 to 3, further comprising nonmagnetic layers provided on both main surfaces of the inductor section.
PCT/JP2011/006759 2010-12-06 2011-12-02 Laminated inductor WO2012077315A1 (en)

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JP2014022551A (en) * 2012-07-18 2014-02-03 Ibiden Co Ltd Printed wiring board and manufacturing method for printed wiring board
JP2016081980A (en) * 2014-10-14 2016-05-16 株式会社村田製作所 Electronic component

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JPS5755918U (en) * 1980-09-18 1982-04-01
JP2002246231A (en) * 2001-02-14 2002-08-30 Murata Mfg Co Ltd Laminated inductor
JP2004153502A (en) * 2002-10-30 2004-05-27 Murata Mfg Co Ltd Laminated lc composite component
WO2005122192A1 (en) * 2004-06-07 2005-12-22 Murata Manufacturing Co., Ltd. Multilayer coil

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JPS5755918U (en) * 1980-09-18 1982-04-01
JP2002246231A (en) * 2001-02-14 2002-08-30 Murata Mfg Co Ltd Laminated inductor
JP2004153502A (en) * 2002-10-30 2004-05-27 Murata Mfg Co Ltd Laminated lc composite component
WO2005122192A1 (en) * 2004-06-07 2005-12-22 Murata Manufacturing Co., Ltd. Multilayer coil

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014022551A (en) * 2012-07-18 2014-02-03 Ibiden Co Ltd Printed wiring board and manufacturing method for printed wiring board
JP2016081980A (en) * 2014-10-14 2016-05-16 株式会社村田製作所 Electronic component
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