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CN-114944265-B - Laminated coil component

CN114944265BCN 114944265 BCN114944265 BCN 114944265BCN-114944265-B

Abstract

The present invention relates to a laminated coil component. The laminated coil component includes a base body formed by laminating a plurality of insulating layers in a laminating direction, and having a first end face and a second end face which face each other in a longitudinal direction, a first main face and a second main face which face each other in a height direction orthogonal to the longitudinal direction, and a first side face and a second side face which face each other in a width direction orthogonal to the longitudinal direction and the height direction, a coil provided in an interior of the base body and formed by electrically connecting a plurality of coil conductors, and a first external electrode extending from at least a part of the first end face of the base body over a part of the first main face and electrically connected to the coil, wherein a laminating direction of the insulating layers and a direction of a coil axis of the coil are parallel to the first main face of the base body as a mounting face, and a magnetic phase including Fe, ni, zn, and Cu and a nonmagnetic phase including Si exist in at least a part of the base body.

Inventors

  • Than Rukawa Atsuo
  • Suradj Nochej
  • GAO JINGJUN
  • KOSHIJI Kenjiro

Assignees

  • 株式会社村田制作所

Dates

Publication Date
20260505
Application Date
20220215
Priority Date
20210217

Claims (7)

  1. 1. A laminated coil component is characterized by comprising: A base body formed by laminating a plurality of insulating layers in a lamination direction, and having a first end face and a second end face that face each other in a longitudinal direction, a first main face and a second main face that face each other in a height direction orthogonal to the longitudinal direction, and a first side face and a second side face that face each other in a width direction orthogonal to the longitudinal direction and the height direction; A coil provided inside the base body and formed by electrically connecting a plurality of coil conductors, and A first external electrode extending from at least a portion of the first end surface of the base body over a portion of the first main surface and electrically connected to the coil, The lamination direction of the insulating layers and the direction of the coil axis of the coil are parallel to the first main surface of the base body as a mounting surface, At least a part of the matrix has a magnetic phase containing Fe, ni, zn and Cu and a nonmagnetic phase containing Si, The first external electrode has a base electrode and a plating electrode provided on the base electrode in this order from the base side, The longitudinal end of the portion of the plating electrode that is present on the first main surface of the base is located closer to the second end surface side of the base than the longitudinal end of the portion of the base electrode that is present on the first main surface of the base, The distance in the length direction between the end of the plating electrode and the end of the base electrode is 30 μm or less, When an interface along the height direction and the width direction is defined at a center position in the longitudinal direction of the base body, the base body has a first base body portion including the first end face and a second base body portion including the second end face arranged in the longitudinal direction with the interface as a boundary, When a first reference position overlapping with the end of the base electrode in the height direction is defined, in the first base portion, there is a first region including at least a range of 20 μm in size in the length direction from the first reference position toward the second end face, In the first region, only the nonmagnetic phase or both the nonmagnetic phase and the magnetic phase are present, A second region outside the first region is also present in the first substrate portion, In the second region, only the magnetic phase is present, or both the magnetic phase and the non-magnetic phase are present, The content of Si in the first region is greater when the total weight is 100 wt% in terms of SiO 2 than when the total weight is 100 wt% in the second region.
  2. 2. The laminated coil component according to claim 1, wherein, The first region contains 30.0 wt% or more of Si in terms of SiO 2 when the total weight is 100 wt%.
  3. 3. The laminated coil component according to claim 2, wherein, The first region includes, when the total weight is set to 100 wt.%: 30.0 to 85.0% by weight of Si in terms of SiO 2 , 4.0 To 15.0 wt% of B calculated by the B 2 O 3 conversion, 0 To 45.0 wt% of Fe calculated by Fe 2 O 3 conversion, 0 To 15.0 wt% of Ni calculated by NiO conversion, 0 To 8.0 wt% of Zn calculated by ZnO conversion, Cu is 0 wt% or more and 5.0 wt% or less in terms of CuO conversion.
  4. 4. The laminated coil component according to claim 3, wherein, The first region further comprises, when the total weight is set to 100 wt%: 0.3 to 1.5% by weight of K calculated by K 2 O conversion, 0.9 To 3.5 wt% of Mg calculated by MgO conversion.
  5. 5. The laminated coil component according to claim 1, wherein, The second region contains 25.0 wt% or less of Si in terms of SiO 2 when the total weight is 100 wt%.
  6. 6. The laminated coil component according to claim 5, wherein, The second region comprises, when the total weight is set to 100 wt%: 0 to 25.0 wt% of Si based on SiO 2 conversion, 0 To 5.0 wt% based on the B 2 O 3 conversion, 45.0 To 70.0 wt% of Fe calculated by Fe 2 O 3 , 10.0 To 20.0 wt% of Ni in terms of NiO, Zn in an amount of 5.0 to 12.0 wt% calculated on ZnO conversion.
  7. 7. The laminated coil component according to any one of claim 1 to 6, wherein, The content of Si in the first region is greater than or equal to 7.0 wt% in terms of SiO 2 when the total weight in the first region is 100 wt% than the content of Si in the second region is 100 wt%.

Description

Laminated coil component Technical Field The present invention relates to a laminated coil component. Background As a laminated coil component excellent in high frequency characteristics, patent document 1 discloses a laminated coil component having a transmission coefficient S21 at 40GHz of-1.0 dB or more and 0dB or less. Patent document 1 Japanese patent application laid-open No. 2019-186255 However, with the development of high-speed and large-capacity communication, it is required to laminate the coil components until the transmission coefficient S21 of a higher frequency band is large and the deviation of the transmission coefficient S21 of the higher frequency band is small. Disclosure of Invention The present invention has been made to solve the above-described problems, and an object thereof is to provide a laminated coil component having a large transmission coefficient S21 in a high frequency band and a small variation. The laminated coil component is characterized by comprising a substrate, a coil provided in the interior of the substrate and formed by electrically connecting a plurality of coil conductors, and a first external electrode extending from at least a part of the first end surface of the substrate over a part of the first main surface and electrically connected to the coil, wherein the direction of the coil axis of the insulating layer and the direction of the coil axis of the coil are parallel to the first main surface of the substrate as a mounting surface, and a magnetic phase containing Fe, ni, zn and a nonmagnetic phase containing Si are present in at least a part of the substrate, and a first external electrode is provided in the interior of the substrate and formed by electrically connecting a plurality of coil conductors, and wherein the first external electrode has a plating layer located between the electrode and the electrode end of the substrate in the direction of the first end surface of the substrate and the electrode in the length direction of the electrode end of the substrate, and the first external electrode being located between the electrode end of the electrode and the electrode of the substrate in the length direction of the electrode of the second end of the substrate, the first external electrode being located between the electrode and the electrode of the substrate. According to the present invention, a laminated coil component having a large transmission coefficient S21 in a high frequency band and a small variation can be provided. Drawings Fig. 1 is a schematic perspective view showing an example of a laminated coil component of the present invention. Fig. 2 is a schematic plan view showing a state of the laminated coil component in fig. 1 as seen from the first end surface side of the base body. Fig. 3 is a schematic plan view showing a state of the laminated coil component in fig. 1 as seen from the first main surface side of the base body. Fig. 4 is a schematic plan view showing a state of the laminated coil component in fig. 1 as seen from the first side surface side of the base body. Fig. 5 is a schematic plan view showing a state of the laminated coil component in fig. 1 as seen from the second side surface side of the base body. Fig. 6 is a schematic plan view showing a state of the laminated coil component in fig. 1 as seen from the second end face side of the base body. Fig. 7 is a schematic cross-sectional view showing an example of a portion corresponding to the line segment A1-A2 in fig. 1. Fig. 8 is a perspective view showing an example of the state in which the base and the coil in fig. 7 are disassembled. Fig. 9 is a schematic plan view showing an example of the state in which the base and the coil in fig. 7 are disassembled. Fig. 10 is a schematic side view of the laminated coil component of fig. 1. Fig. 11 is a schematic view showing a part of a cross section along the longitudinal direction and the height direction of the first base portion and the first external electrode in fig. 10. Fig. 12 is a schematic view showing a part of a cross section along the longitudinal direction and the height direction of the second base portion and the second external electrode in fig. 10. Fig. 13 is a graph showing measurement results of transmission coefficients S21 of samples 1, 3, and 4 of the laminated coil component. Description of the reference numerals Laminated coil components; a substrate, a first end face, a second end face, a first main face, a second main face, a first side face, a second side face, a 15, 15a, 15b, 15c, 15d, 15e, an insulating layer, a first external electrode, 21a, 22a, a base electrode, 21aa, 22aa, a longitudinal end of a portion of the base electrode present on the first main face of the substrate, 21b, 22b, a plating electrode, 21ba, a, The end in the longitudinal direction of the portion of the plated electrode present on the first main surface of the substrate, 22..second external electrode, 30..coil, 31a, 31b, 31c,