JP2018125455A - Laminate coil component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminate coil component in which a connection intensity of a leading pattern and a terminal electrode is improved.SOLUTION: In a laminate coil component, an area of an edge surface 14c of a leading pattern 14 exposed to a side surface 2b of an element body is wider than that of a laminate coil component in which a magnetic material layer 32 is not retired to a side surface 2b from a magnetic material layer 31. That is, an exposed area of the end part of the leading pattern 14 becomes wider. Since the exposed area of the edge part of the leading pattern 14 is enlarged, a contact area of a terminal electrode provided in the side surface 2b and the leading pattern 14 is enlarged. When enlarging the contact area of the terminal electrode and the leading pattern 14, the connection intensity of the leading pattern 14 and the terminal electrode is enhanced. Thus, the connection intensity of the leading pattern 14 and the terminal electrode is improved in the laminate coil component.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a laminated coil component.

  Conventionally, a coil component is known as a kind of electronic component. For example, Patent Document 1 below discloses a multilayer coil component in which a coil in which a conductor pattern is spirally connected is formed inside an element body.

JP 2003-31424 A

  In the laminated coil component described above, the coil formed in the element body is drawn out to the outer surface of the element body by the drawing pattern and joined to the terminal electrode provided on the outer surface. At this time, if the bonding strength is low, it is difficult to obtain sufficient element characteristics.

  An object of the present invention is to provide a laminated coil component in which the bonding strength between a lead pattern and a terminal electrode is improved.

  A multilayer coil component according to an aspect of the present invention includes an element body formed by laminating a plurality of layers, a coil having a plurality of coil patterns disposed between layers of the element body and connected to each other, and A lead pattern that is disposed between layers of the body and extends from the end of the coil to the side of the element body, and the end is exposed on the side, and a terminal electrode that covers the end of the lead pattern exposed on the side of the element A first layer of the element body in contact with one side of the drawer pattern in the stacking direction of the element body is set back with respect to the side surface than a second layer of the element body in contact with the other side of the drawer pattern; The other surface of the first electrode reaches the side edge of the second layer of the element body.

  In the laminated coil component, the exposed area where the end portion of the lead pattern is exposed from the side surface of the element body is increased. Thereby, the contact area between the lead pattern and the terminal electrode is increased, and accordingly, the bonding strength between the lead pattern and the terminal electrode is improved.

  In the laminated coil component according to another aspect of the present invention, one end surface in the lamination direction of the element body is a mounting surface, and the terminal electrodes are integrally formed from the side surface of the element body to the mounting surface. In this case, since the terminal electrode partially enters the portion of the first layer that has receded from the side surface of the element body, the terminal electrode on the side surface can be thinned.

  In the laminated coil component according to another aspect of the present invention, the end face of the lead pattern exposed on the side surface of the element body in the cross section parallel to the plane stretched in the lamination direction of the element body and the normal direction of the side surface is the end face. Is tilted with respect to the exposed side. Further, one surface of the drawing pattern reaches the edge on the side surface side of the first layer of the element body. In this case, since the side surface of the element body and the end face of the lead pattern become a continuous surface and no sharp irregularities are formed around the end face of the lead pattern, for example, poor bonding when forming terminal electrodes is effectively suppressed. .

  ADVANTAGE OF THE INVENTION According to this invention, the laminated coil component by which the joining strength of a drawing pattern and a terminal electrode was improved is provided.

It is the schematic perspective view which showed the laminated coil component which concerns on 1st Embodiment. It is the figure which showed the conductor pattern of the laminated coil shown in FIG. It is the III-III sectional view taken on the line of the laminated coil shown in FIG. FIG. 4 is a cross-sectional view of the laminated coil shown in FIG. 1 taken along the line IV-IV. (A) The principal part enlarged view of the cross section shown in FIG. 4, (b) The principal part enlarged view of the cross section of the laminated coil component which concerns on a prior art. It is the schematic perspective view which showed the laminated coil component which concerns on 2nd Embodiment. It is the figure which showed the conductor pattern of the laminated coil shown in FIG. It is the VIII-VIII sectional view taken on the line of the laminated coil component shown in FIG. It is the IX-IX sectional view taken on the line of the laminated coil component shown in FIG. (A) The principal part enlarged view of the cross section shown in FIG. 9, (b) The principal part enlarged view of the cross section of the laminated coil component which concerns on a prior art. It is a principal part expanded sectional view of the laminated coil component of a different aspect.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted.

  First, the overall configuration of the laminated coil component 1 according to the first embodiment will be described with reference to FIGS.

  As shown in FIG. 1, the laminated coil component 1 includes an element body 2 and a pair of terminal electrodes 4 and 5 arranged at both ends of the element body 2.

  The element body 2 has a rectangular parallelepiped shape. The element body 2 has, as its outer surface, a pair of end surfaces 2a, 2b facing each other, and four side surfaces 2c, 2d extending in the opposing direction of the pair of end surfaces 2a, 2b so as to connect the pair of end surfaces 2a, 2b. 2e, 2f. The side surface 2d is defined as, for example, a surface (that is, a mounting surface) that faces the other electronic device when the multilayer coil component 1 is mounted on another electronic device (not shown) (for example, a circuit board or an electronic component). The

  The facing direction between the end face 2a and the end face 2b (X direction in the figure), the facing direction between the side face 2c and the side face 2d (Z direction in the figure), and the facing direction between the side face 2e and the side face 2f (Y in the figure) Are substantially orthogonal to each other. The rectangular parallelepiped shape includes a rectangular parallelepiped shape in which corners and ridge line portions are chamfered, and a rectangular parallelepiped shape in which corners and ridge line portions are rounded.

  The element body 2 has a laminated structure, and is configured by laminating a plurality of magnetic layers 30 to 32 shown in FIGS. The plurality of magnetic layers 30 to 32 are stacked in the opposing direction of the side surface 2 c and the side surface 2 d of the element body 2. That is, the stacking direction of the plurality of magnetic layers 30 to 32 coincides with the facing direction (the Z direction in the drawing) between the side surface 2c and the side surface 2d of the element body 2. Hereinafter, the stacking direction of the magnetic layers 30 to 32 of the element body 2 (that is, the facing direction between the side surface 2c and the side surface 2d) is also referred to as “Z direction”. The plurality of magnetic layers 30 to 32 each have a substantially rectangular shape. In the actual element body 2, the plurality of magnetic layers 30 to 32 are integrated to such an extent that boundaries between the layers cannot be visually recognized.

  Each of the magnetic layers 30 to 32 is made of a magnetic paste containing powder of a magnetic material (Ni—Cu—Zn ferrite material, Ni—Cu—Zn—Mg ferrite material, Ni—Cu ferrite material, etc.), for example. It is composed of a sintered body. That is, the element body 2 has magnetism. The magnetic paste may contain a powder such as an Fe alloy.

  The terminal electrode 4 is disposed on the end surface 2 a of the element body 2, and the terminal electrode 5 is disposed on the end surface 2 b of the element body 2. That is, the terminal electrode 4 and the terminal electrode 5 are located apart from each other in the opposing direction of the end surface 2a and the end surface 2b. The terminal electrodes 4 and 5 have a substantially rectangular shape in plan view, and the corners are rounded. The terminal electrodes 4 and 5 include a conductive material (for example, Ag or Pd). The terminal electrodes 4 and 5 are configured as a sintered body of a conductive paste containing conductive metal powder (for example, Ag powder or Pd powder) and glass frit. The terminal electrodes 4 and 5 are subjected to electroplating, whereby a plating layer is formed on the surface thereof. For example, Ni, Sn or the like is used for electroplating.

  The terminal electrode 4 includes an electrode portion 4a located on the end surface 2a, an electrode portion 4b located on the side surface 2d, an electrode portion 4c located on the side surface 2c, an electrode portion 4d located on the side surface 2e, The electrode portion 4e located on 2f and five electrode portions are included. The electrode portion 4a covers the entire end surface 2a. The electrode portion 4b covers a part of the side surface 2d. The electrode portion 4c covers a part of the side surface 2c. The electrode portion 4d covers a part of the side surface 2e. The electrode portion 4e covers a part of the side surface 2f. The five electrode portions 4a, 4b, 4c, 4d, and 4e are integrally formed.

  The terminal electrode 5 includes an electrode portion 5a located on the end surface 2b, an electrode portion 5b located on the side surface 2d, an electrode portion 5c located on the side surface 2c, an electrode portion 5d located on the side surface 2e, The electrode portion 5e located on 2f and five electrode portions are included. The electrode portion 5a covers the entire end surface 2b. The electrode portion 5b covers a part of the side surface 2d. The electrode portion 5c covers a part of the side surface 2c. The electrode portion 5d covers a part of the side surface 2e. The electrode portion 5e covers a part of the side surface 2f. The five electrode portions 5a, 5b, 5c, 5d, and 5e are integrally formed.

  Next, the coil C1 formed inside the element body 2 of the present embodiment will be described with reference to FIGS.

  As shown in FIGS. 2 to 4, the coil C <b> 1 is configured by connecting a plurality of layers of conductor patterns 21, 22, 23, and 24 in a spiral shape. 2A to 2L, a plurality of layers of conductor patterns 21, 22, 23, and 24 are illustrated in the order of being stacked from the side surface 2 d toward the side surface 2 c.

  As shown in FIG. 2A, the conductor pattern 21 is formed on the magnetic layer 30 (first layer) located closest to the side surface 2d. The conductor pattern 21 includes the coil pattern 11 and the lead pattern 13. It consists of and. The coil pattern 11 is wound in a substantially annular shape. One end of the coil pattern 11 is connected to the drawer pattern 13. The lead-out pattern 13 extends to the side on the side surface 2a, and its end is exposed on the side surface 2a. A connecting portion 18 to which the through-hole conductor 17 is connected is provided at the other end portion of the coil pattern 11.

  As shown in FIG. 2B, on the magnetic layer 30 on which the conductor pattern 21 is formed, the magnetic layer 31 (the first layer) in which the conductor pattern 22 composed of a coil pattern wound in a substantially annular shape is formed. 2 layers). Connection portions 18 are provided at both ends of the conductor pattern 22, and the connection portion 18 provided at one end portion of the conductor pattern 22 and the connection portion 18 of the coil pattern 11 of the conductor pattern 21 are magnetic layers 31. Are connected to each other by through-hole conductors 17 penetrating them.

  As shown in FIG. 2C, a magnetic layer 31 formed with a conductor pattern 23 composed of a coil pattern wound in a substantially annular shape is superimposed on the magnetic layer 31 formed with a conductor pattern 22. It has been. Connection portions 18 are provided at both ends of the conductor pattern 23. The connection portion 18 provided at one end portion of the conductor pattern 23 and the connection portion 18 provided at the other end portion of the conductor pattern 22 are magnetic. They are connected to each other by through-hole conductors 17 that penetrate the body layer 31.

  In the laminated coil component 1, the magnetic layer 31 in which the conductor pattern 22 is formed and the magnetic layer 31 in which the conductor pattern 23 is formed are alternately stacked. Specifically, as shown in FIGS. 2B to 2J, five magnetic layers 31 each having a conductor pattern 22 and four magnetic layers 31 each having a conductor pattern 23 are formed. Are alternately stacked.

  As shown in FIG. 2 (k), the conductor pattern 24 positioned closest to the side surface 2 c is formed on the magnetic layer 31. The conductor pattern 24 includes the coil pattern 12 and the lead pattern 14. The coil pattern 12 is wound in a substantially U shape. One end of the coil pattern 12 is connected to the lead pattern 14. The lead-out pattern 14 extends to the side on the side surface 2b side, and its end is exposed on the side surface 2b. A connecting portion 18 is provided at the other end of the coil pattern 12, and the connecting portion 18 and the connecting portion 18 of the conductor pattern 22 are connected by a through-hole conductor 17 that penetrates the magnetic layer 31.

  On the magnetic layer 31 on which the conductor pattern 24 is formed, as shown in FIG. 2 (k), a magnetic layer 32 (first layer) on which no conductor pattern is formed is overlaid.

  The plurality of conductor patterns 21, 22, 23, and 24 are arranged apart from each other in the Z direction so as to have portions that overlap each other when viewed from the Z direction. The connection portions 18 of the conductor patterns 21, 22, 23, 24 are connected to each other by a through-hole conductor 17 located between the connection portions. The connection portions 18 of the conductor patterns 21 to 24 are connected to each other through the through-hole conductors 17 so that the conductor patterns 21 to 24 are electrically connected to each other. Thereby, the coil C <b> 1 including the conductor patterns 21 to 24 is formed in the element body 2. That is, the laminated coil component 1 includes a coil C <b> 1 in the element body 2. The axis of the coil C1 extends along the Z direction.

  The lead patterns 13 and 14 connected to both ends of the coil C1 (that is, one end of the coil pattern 11 of the conductor pattern 21 and one end of the coil pattern 12 of the conductor pattern 24) are respectively connected to the ends of the coil C1. To the side surfaces 2a and 2b of the element body 2, and the end portions are exposed at the side surfaces 2a and 2b. The ends of the lead patterns 13 and 14 exposed on the side surfaces 2a and 2b of the element body 2 are covered with the above-described terminal electrodes 4 and 5 provided on the side surfaces 2a and 2b.

  Next, an example of a procedure for manufacturing the laminated coil component 1 described above will be described.

  First, the above-described magnetic green sheets to be the magnetic layers 30 to 32 and the conductive paste patterns to be the conductor patterns 21 to 24 and the through-hole conductors 17 are sequentially laminated by a printing method or the like to obtain a laminate. Get.

  The magnetic green sheet is formed by applying a magnetic paste and drying it. The magnetic paste is prepared by mixing the above-described magnetic material powder, an organic solvent, an organic binder, and the like. The conductive paste pattern is formed by applying a conductive paste and drying it. The conductive paste is prepared by mixing the conductive metal powder, an organic solvent, an organic binder, and the like.

  Subsequently, the laminated body is cut so as to have the dimension and shape of each laminated coil component 1. Thereby, a green chip is obtained. Subsequently, barrel polishing of the obtained green chip is performed. Thereby, the green chip | tip with which the corner | angular part or the ridgeline was rounded is obtained. Subsequently, the barrel-polished green chip is fired under predetermined conditions to obtain the element body 2. Conductor patterns 21 to 24 and through-hole conductors 17 are formed as sintered bodies of conductive paste patterns. At this time, one end of the coil pattern 11 of the conductor pattern 21 and one end of the coil pattern 12 of the conductor pattern 24 are exposed on the side surfaces 2 a and 2 b of the element body 2.

  Subsequently, a conductive paste to be the terminal electrodes 4, 5 is applied to the outer surface of the element body 2, and heat treatment is performed under predetermined conditions to form the terminal electrodes 4, 5 by baking. At this time, the end portions of the lead patterns 13 and 14 exposed on the side surfaces 2 a and 2 b of the element body 2 are covered with the terminal electrodes 4 and 5. Thereafter, the surfaces of the terminal electrodes 4 and 5 are plated. The laminated coil component 1 described above is obtained by the above procedure.

  Here, all of the magnetic green sheets to be the plurality of magnetic layers 31 have the same (or substantially the same) thermal shrinkage when fired in the form of a green chip. The magnetic green sheets 31 and the magnetic green sheets 30 and 32 have different thermal shrinkage rates when fired in the form of green chips. Specifically, the magnetic green sheets to be the magnetic layers 30 and 32 are adjusted to have a thermal contraction rate higher than that of the magnetic green sheet to be the magnetic layer 31. Such adjustment of the heat shrinkage rate can be realized, for example, by changing the material and composition ratio of the magnetic paste used for forming the magnetic layer.

  The magnetic green sheets that become the magnetic layers 30 and 32 contract more greatly than the magnetic green sheets that become the magnetic layers 31 when fired, and as shown in FIGS. The dimensions of the 2c portion and the side surface 2d portion are narrowed. As a result, as shown in FIG. 5A, in the cross section parallel to the ZX plane (that is, the cross section parallel to the plane stretched between the stacking direction of the element body 2 and the normal direction of the side surface 2b), The magnetic layer 32 closest to the side surface 2c of the body 2 is set back with respect to the side surface 2b with respect to the magnetic layer 31 adjacent in the stacking direction via the lead pattern 14. Further, the surface (the upper surface in FIG. 5A) 14 a that contacts the magnetic layer 32 of the lead pattern 14 reaches the edge E <b> 1 on the side surface 2 b side of the magnetic layer 32. Furthermore, the surface (the lower surface in FIG. 5A) 14b of the lead pattern 14 that contacts the magnetic layer 31 also reaches the edge E2 on the side surface 2b side of the magnetic layer 31. The end face 14c of the lead pattern 14 exposed from the side surface 2b of the element body 2 is inclined with respect to the stacking direction (Z direction) of the element body 2 between both edges E1 and E2.

  In the multilayer coil component 1 of the above aspect, the side surface 2b of the element body 2 is compared to the multilayer coil component in which the magnetic layer 32 as shown in FIG. The area of the end face 14c of the lead pattern 14 exposed to the wide area is large, that is, the exposed area of the end part of the lead pattern 14 is wide.

  In the laminated coil component 1 described above, the contact area between the terminal electrode 5 provided on the side surface 2b and the lead pattern 14 is increased by increasing the exposed area of the end portion of the lead pattern 14. When the contact area between the terminal electrode 5 and the lead pattern 14 is increased, the bonding strength between the lead pattern 14 and the terminal electrode 5 is increased. Therefore, in the laminated coil component 1, the bonding strength between the lead pattern 14 and the terminal electrode 5 is improved. Is realized.

  As for the extraction pattern 13, similarly to the extraction pattern 14, the magnetic layer 30 closest to the side surface 2 d of the element body 2 is adjacent in the stacking direction via the extraction pattern 13 in a cross section parallel to the ZX plane. The side surface 2a recedes from the magnetic layer 31. Further, the surface of the lead pattern 13 that contacts the magnetic layer 30 reaches the edge of the magnetic layer 30 on the side surface 2a side. Furthermore, the surface of the lead pattern 13 that contacts the magnetic layer 31 also reaches the edge of the magnetic layer 31 on the side surface 2a side. And the end surface of the drawing pattern 13 exposed from the side surface 2a of the element body 2 is inclined with respect to the stacking direction (Z direction) of the element body 2 between both edges.

  Therefore, the area of the end face of the drawing pattern 13 exposed on the side surface 2a of the element body 2 is large, that is, the exposed area of the end portion of the drawing pattern 13 is wide. Therefore, in the laminated coil component 1, the bonding strength between the lead pattern 13 and the terminal electrode 4 is also improved.

  Next, the overall configuration of the laminated coil component 1A according to the second embodiment will be described with reference to FIGS.

  The laminated coil component 1 </ b> A according to the present embodiment is the first in that it includes terminal electrodes 4 </ b> A and 5 </ b> A having a shape different from the terminal electrodes 4 and 5 described above, and a coil C <b> 2 having a shape different from the coil C <b> 1 described above. Unlike the laminated coil component 1 according to the embodiment, the other configurations are the same or similar.

  The terminal electrode 4A has an L-shaped cross section as shown in FIG. 8, and includes two electrode portions, an electrode portion 4a located on the end surface 2a and an electrode portion 4b located on the side surface 2d. Contains. The electrode portion 4a covers a part of the end surface 2a on the side surface 2d side. The electrode portion 4b covers a part of the side surface 2d. The two electrode portions 4a and 4b are integrally formed.

  The terminal electrode 5 also has an L-shaped cross section as shown in FIG. 8, and includes two electrode portions, an electrode portion 5a located on the end surface 2b and an electrode portion 5b located on the side surface 2d. Contains. The electrode portion 5a covers a part of the end surface 2b on the side surface 2d side. The electrode portion 5b covers a part of the side surface 2d. The two electrode portions 5a and 5b are integrally formed.

  Next, the coil C2 formed inside the element body 2 of the present embodiment will be described with reference to FIGS.

  As shown in FIGS. 7 to 9, the coil C <b> 2 is configured by connecting a plurality of layers of conductor patterns 21 </ b> A, 21 </ b> B, 22 </ b> A, 22 </ b> B, 23 </ b> A, 23 </ b> B, and 24 </ b> A in a double spiral shape. In FIGS. 7A to 7L, a plurality of conductor patterns 21A, 21B, 22A, 22B, 23A, 23B, and 24A are shown in the order of being stacked from the side surface 2d toward the side surface 2c.

  As shown in FIG. 7A, conductor patterns 21A and 21B are formed on the magnetic layer 30 located closest to the side surface 2d. The conductor pattern 21A is composed of a coil pattern 11A and a lead pattern 13A. The coil pattern 11 </ b> A has a substantially I shape along the short side of the magnetic layer 30. One end of the coil pattern 11A is connected to the lead pattern 13A. The drawer pattern 13A extends to the side on the side surface 2a, and its end is exposed on the side surface 2a. A connecting portion 18A to which the through-hole conductor 17 is connected is provided at the other end portion of the coil pattern 11A. The conductor pattern 21B is composed of a coil pattern 11B and a lead pattern 14A. The coil pattern 11 </ b> B has a substantially I shape along the long side of the magnetic layer 30. One end of the coil pattern 11B is connected to the lead pattern 14A. The lead pattern 14A extends to the side on the side surface 2b, and its end is exposed on the side surface 2b. A connecting portion 18B to which the through-hole conductor 17 is connected is provided at the other end portion of the coil pattern 11B.

  As shown in FIG. 7B, conductor patterns 22A and 22B each formed of a coil pattern wound in a substantially U shape are formed on the magnetic layer 30 on which the conductor patterns 21A and 21B are formed. A magnetic layer 31 is overlaid. Connection portions 18A are provided at both ends of the conductor pattern 22A. The connection portion 18A provided at one end of the conductor pattern 22A and the connection portion 18A of the coil pattern 11A of the conductor pattern 21A are connected to the magnetic layer 31. Are connected to each other by through-hole conductors 17 penetrating them. Similarly, connection portions 18B are provided at both ends of the conductor pattern 22B, and the connection portion 18B provided at one end of the conductor pattern 22B and the connection portion 18B of the coil pattern 11B of the conductor pattern 21B are magnetic. They are connected to each other by through-hole conductors 17 that penetrate the body layer 31.

  As shown in FIG. 7 (c), conductor patterns 23A and 23B composed of coil patterns wound in a substantially U shape are formed on the magnetic layer 31 on which the conductor patterns 22A and 22B are formed. A magnetic layer 31 is overlaid. Connection portions 18A are provided at both ends of the conductor pattern 23A. The connection portion 18A provided at one end of the conductor pattern 23A and the connection portion 18A provided at the other end of the conductor pattern 22A are magnetic. They are connected to each other by through-hole conductors 17 that penetrate the body layer 31. Similarly, connection portions 18B are provided at both ends of the conductor pattern 23B, respectively, and a connection portion 18B provided at one end portion of the conductor pattern 23B and a connection portion 18B provided at the other end portion of the conductor pattern 22B. Are connected to each other by a through-hole conductor 17 penetrating the magnetic layer 31.

  In the laminated coil component 1A, the magnetic layers 31 on which the conductor patterns 22A and 22B are formed and the magnetic layers 31 on which the conductor patterns 23A and 23B are formed are alternately stacked. Specifically, as shown in FIGS. 7B to 7J, the five magnetic layers 31 formed with the conductor patterns 22A and 22B and the four layers of magnetic formed with the conductor patterns 23A and 23B, respectively. The body layers 31 are alternately stacked.

  As shown in FIG. 7 (k), the conductor pattern 24A located closest to the side surface 2c is formed on the magnetic layer 31. The conductor pattern 24 </ b> A is configured by a substantially annular coil pattern 12. A connection portion 18A is provided at one end of the conductor pattern 24A, and the connection portion 18A and the connection portion 18A of the conductor pattern 22A are connected by a through-hole conductor 17 that penetrates the magnetic layer 31. Further, a connecting portion 18B is provided at the other end of the conductor pattern 24A, and the connecting portion 18B and the connecting portion 18B of the conductor pattern 22B are connected by a through-hole conductor 17 that penetrates the magnetic layer 31. .

  On the magnetic layer 31 on which the conductor pattern 24A is formed, as shown in FIG. 7K, a magnetic layer 32 on which no conductor pattern is formed is overlaid.

  The plurality of conductor patterns 21A, 21B, 22A, 22B, 23A, 23B, and 24A are arranged apart from each other in the Z direction so as to have portions that overlap each other when viewed from the Z direction. The connection portions 18A and the connection portions 18B of the conductor patterns 21A, 21B, 22A, 22B, 23A, 23B, and 24A are connected to each other by through-hole conductors 17 located between the connection portions. The conductor patterns 21A, 21B, 22A, 22B, 23A, 23B, and 24A are connected to each other through the through-hole conductor 17 and the connection parts 18A are connected to each other via the through-hole conductors 17 so that the conductor patterns 21A, 21B, 22A, 22B, 23A, 23B, and 24A are electrically connected to each other. Thus, a coil C2 including conductor patterns 21A, 21B, 22A, 22B, 23A, 23B, and 24A is formed in the element body 2. That is, the laminated coil component 1 </ b> A includes a coil C <b> 2 in the element body 2. The axis of the coil C2 extends along the Z direction.

  The lead patterns 13A and 14A connected to both ends of the coil C2 (that is, one end of the coil pattern 11A of the conductor pattern 21A and one end of the coil pattern 11B of the conductor pattern 21B) are respectively end portions of the coil C2. To the side surfaces 2a and 2b of the element body 2, and the end portions are exposed at the side surfaces 2a and 2b. The ends of the lead patterns 13A and 14A exposed on the side surfaces 2a and 2b of the element body 2 are covered with the terminal electrodes 4A and 5A provided on the side surfaces 2a and 2b.

  Also in the second embodiment, the magnetic green sheets to be the plurality of magnetic layers 31 all have the same (or substantially the same) thermal contraction rate when fired in the form of a green chip. However, the thermal contraction rate when the green magnetic sheet serving as the magnetic layer 31 and the magnetic green sheet serving as the magnetic layers 30 and 32 are fired in the form of a green chip is different. Specifically, the magnetic green sheets to be the magnetic layers 30 and 32 are adjusted to have a thermal contraction rate higher than that of the magnetic green sheet to be the magnetic layer 31.

  Therefore, the magnetic green sheets that become the magnetic layers 30 and 32 contract more greatly than the magnetic green sheets that become the magnetic layers 31 when fired, and when viewed from the Z direction as shown in FIGS. The size of the side surface 2c and the side surface 2d is reduced. As a result, as in the first embodiment, as shown in FIG. 10A, in the cross section parallel to the ZX plane, the magnetic layer 30 closest to the mounting surface 2d of the element body 2 passes through the extraction pattern 13A. Thus, the side surface 2a is retracted from the magnetic layer 31 adjacent in the stacking direction. Further, a surface (upper surface in FIG. 10A) 13a of the lead pattern 13A that contacts the magnetic layer 30 reaches the edge E1 on the side surface 2a side of the magnetic layer 32. Further, the surface (the lower surface in FIG. 10A) 13 b of the lead pattern 14 that contacts the magnetic layer 31 also reaches the edge E <b> 2 on the side surface 2 a side of the magnetic layer 31. The end face 13c of the lead pattern 13A exposed from the side surface 2a of the element body 2 is inclined with respect to the stacking direction (Z direction) of the element body 2 between both edges E1 and E2.

  In the laminated coil component 1 </ b> A of the above aspect, as with the laminated coil component 1 according to the first embodiment, the magnetic body layer 30 is compared with the laminated coil component in which the magnetic layer 30 is not retracted with respect to the side surface 2 a than the magnetic body layer 31. The area of the end surface 13c of the drawer pattern 13A exposed to the side surface 2a is large, that is, the exposed area of the end portion of the drawer pattern 13A is wide.

  In the laminated coil component 1A described above, the contact area between the terminal electrode 4A provided on the side surface 2a and the lead pattern 13A is increased by increasing the exposed area of the end portion of the lead pattern 13A. When the contact area between the terminal electrode 4A and the extraction pattern 13A is increased, the bonding strength between the extraction pattern 13A and the terminal electrode 4A is increased. Therefore, in the laminated coil component 1A, the bonding strength between the extraction pattern 13A and the terminal electrode 4A is improved. It has been realized.

  As for the lead pattern 14A, similarly to the lead pattern 13A, in the cross section parallel to the ZX plane, the magnetic layer 30 has a side surface 2b that is closer to the side surface 2b than the magnetic layer 31 adjacent in the stacking direction via the lead pattern 14A. Retreat with respect to. Further, the surface of the lead pattern 14 </ b> A in contact with the magnetic layer 30 reaches the edge on the side surface 2 b side of the magnetic layer 30. Further, the surface of the lead pattern 14 </ b> A that contacts the magnetic layer 31 also reaches the edge of the magnetic layer 31 on the side surface 2 b side. The end face of the lead pattern 14A exposed from the side surface 2b of the element body 2 is inclined with respect to the stacking direction (Z direction) of the element body 2 between both edges.

  Therefore, the area of the end face of the lead pattern 14A exposed on the side surface 2b of the element body 2 is large, that is, the exposed area of the end portion of the lead pattern 14A is wide. Therefore, in the laminated coil component 1A, the bonding strength between the lead pattern 14A and the terminal electrode 5A is also improved.

  Furthermore, in the laminated coil component 1 </ b> A according to the second embodiment, as shown in FIG. 10A, the terminal electrode 4 </ b> A partially enters the portion of the magnetic layer 30 that has receded from the side surface 2 a of the element body 2. Yes. Therefore, the thickness of the side electrode 2A of the terminal electrode 4A can be reduced compared to the laminated coil component in which the magnetic layer 30 as shown in FIG. 5B is not retracted with respect to the side surface 2a than the magnetic layer 31. it can. For example, in the laminated coil component shown in FIG. 5B, the terminal electrode 4A protrudes from the side surface 2a of the element body 2 by a thickness d, but in the laminated coil component 1A according to the second embodiment, Since the terminal electrode 4A partially enters the portion of the magnetic layer 30 that has receded from the side surface 2a of the body 2, the thickness of the terminal electrode 4A with respect to the side surface 2a of the element body 2 can be further reduced. Can be prevented from protruding from the side surface 2 a of the element body 2.

  As described above, in the laminated coil component 1A according to the second embodiment, since the terminal electrode 4A on the side surface 2a is thinned, the element body 2 having a larger exclusive area is disposed in a specified installation region. And a larger coil C2 can be formed in the element body 2.

  The laminated coil component is not limited to the embodiment described above, and can be variously modified. For example, one surface of the drawer pattern (for example, the surface 14a of the drawer pattern in FIG. 5A) is not necessarily the edge E1 on the side surface side of the first layer (for example, the magnetic layer 32 in FIG. 5A). It is not necessary to have reached. For example, an aspect as shown in FIG. 11 may be used. In any of the modes shown in FIG. 11, the surface 14a of the extraction pattern 14 in contact with the magnetic layer 32 does not reach the edge E1 on the side surface 2b side of the magnetic layer 32, and the end of the extraction pattern 14 is at the magnetic layer. 32 is exposed. Even in these modes, the area of the end face of the lead pattern 14 exposed on the side surface 2b of the element body 2 is large, that is, the exposed area of the end portion of the lead pattern 14 is wide. For this reason, the bonding strength between the lead pattern and the terminal electrode can be improved.

  However, as shown in FIG. 5A, when one side of the drawer pattern reaches the edge on the side surface of the first layer, the side surface of the element body and the end surface of the drawer pattern are continuous. As a result, no sharp irregularities are formed around the end face of the drawer pattern. Therefore, when the terminal electrode is baked and formed on the side surface of the element body, the occurrence of cracks and voids due to heat shrinkage at the interface between the element body and the terminal electrode is suppressed, resulting in poor bonding between the element body and the terminal electrode. Can be effectively suppressed.

  Moreover, although the element body 2 has been illustrated as being composed of a magnetic material, it may be composed of a non-magnetic material. That is, the layer constituting the element body 2 may be a nonmagnetic layer instead of a magnetic layer. The nonmagnetic layer can be composed of a fired body obtained by firing a ceramic green sheet containing a nonmagnetic material, for example. Examples of the nonmagnetic material include Cu—Zn ferrite, dielectric material, and glass ceramic material.

  DESCRIPTION OF SYMBOLS 1 ... Laminated coil component, 2 ... Element body, C1, C2 ... Coil, 13, 14, 13A, 14A ... Drawer pattern, 11, 12, 22, 22A, 22B, 23, 23A, 23B, 24A ... Coil pattern, 30 32 ... 1st layer, 31 ... 2nd layer.

Claims (4)

An element body formed by laminating a plurality of layers;
A coil having a plurality of coil patterns disposed between layers of the element body and connected to each other between the layers;
A drawer pattern disposed between the layers of the element body and extending from an end portion of the coil to a side surface of the element body, and an end portion is exposed on the side surface;
A terminal electrode covering the end of the lead pattern exposed on the side surface of the element body;
The first layer of the element body in contact with one surface of the drawer pattern in the stacking direction of the element body is more receded with respect to the side surface than the second layer of the element body in contact with the other surface of the drawer pattern. And
The laminated coil component, wherein the other surface of the drawing pattern reaches an edge on the side surface of the second layer of the element body. One end face in the stacking direction of the element body is a mounting surface,
The laminated coil component according to claim 1, wherein the terminal electrode is integrally formed from the side surface of the element body to the mounting surface.   In a cross section parallel to a plane stretched between the stacking direction of the element bodies and the normal direction of the side surfaces, the end surface of the lead pattern exposed on the side surfaces of the element body is inclined with respect to the side surface where the end surfaces are exposed. The laminated coil component according to claim 1 or 2.   The multilayer coil component according to claim 3, wherein the one surface of the drawing pattern reaches an edge on the side surface of the first layer of the element body.

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