JP2016018812A - Laminate coil component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminate coil component that can prevent connection failure between a coil and an external electrode.SOLUTION: A laminate coil component has a laminate obtained by laminating insulator sheets 11a to 11g, 12, coils 14, 15 formed in the laminate, lead-out conductors 14a, 15a connected to both the end portions of the coils 14, 15, and external electrodes connected to the lead-out conductors 14a, 15a. The lead-out conductors 14a, 15a are formed to be exposed over an area extending from the side surface of the laminate to the end face, and cut-out portions are formed at the exposed portions of the lead-out conductors 14a, 15a.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a laminated coil component such as a common mode noise filter used in various electronic devices such as digital devices, AV devices, and information communication terminals.

  As shown in FIGS. 5 and 6, the conventional laminated coil component of this type includes a laminated body 2 obtained by laminating an insulating sheet 1, and two coils 3 formed inside the laminated body 2, 4, lead conductors 3 a and 4 a connected to both ends of the coils 3 and 4, and external electrodes 5 connected to the lead conductors 3 a and 4 a, and the lead conductors 3 a and 4 a The external electrode 5 was formed so as to be exposed from the side surface 1a to the end surface 1b. Further, the external electrode 5 was configured to be continuous with the four corners of the multilayer body 2 from the side surface 2a to the end surface 2b in the top view.

  As prior art document information relating to the invention of this application, for example, Patent Document 1 is known.

JP 2003-318687 A

  In the conventional laminated coil component described above, when it is cut into individual pieces, it is necessary to cut the lead conductors 3a and 4a exposed from the side surface 1a to the end surface 1b of the insulating sheet 1, so that the lead at the time of cutting is drawn. When the stress applied to the conductors 3a and 4a is larger than the adhesive force between the lead conductors 3a and 4a and the insulating sheet 1 (laminated body 2), the lead conductors 3a and 4a are scattered. There was a problem that a connection failure with the external electrode 5 might occur.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a laminated coil component that can prevent a connection failure between a coil and an external electrode.

  In order to achieve the above object, the present invention has the following configuration.

  Invention of Claim 1 of this invention is a laminated body obtained by laminating | stacking an insulator sheet | seat, the coil formed in the inside of the said laminated body, and the lead conductor connected to the both ends of the said coil, An external electrode connected to the lead conductor, wherein the lead conductor is formed so as to be exposed from a side surface to an end surface of the multilayer body, and a notch is formed in an exposed portion of the lead conductor. According to this configuration, since the area of the lead conductor cut when cutting into individual pieces is reduced, the stress applied to the lead conductor at the time of cutting is reduced, thereby extracting the stress applied to the lead conductor at the time of cutting. Since it can be made smaller than the adhesive force between the conductor and the laminate, it is possible to prevent the lead conductor from scattering, and as a result, it has the effect of preventing poor connection between the coil and the external electrode. That.

  In the invention described in claim 2 of the present invention, the notch is particularly provided at a position where the side surface and the end surface of the laminated body are in contact. According to this configuration, the cutout portion is added to the lead conductor at the time of cutting. Since a notch part can be formed in the place where stress is the largest, it has the effect that stress applied to the lead conductor during cutting can be further reduced.

  As described above, the multilayer coil component of the present invention is formed so that the lead conductor is exposed from the side surface to the end surface of the multilayer body, and the cutout portion is formed in the exposed portion of the lead conductor. The area of the lead conductor that is cut at the time of cutting is reduced, thereby reducing the stress applied to the lead conductor at the time of cutting. Therefore, the stress applied to the lead conductor at the time of cutting is made smaller than the adhesive force between the lead conductor and the laminate. As a result, it is possible to prevent the lead conductor from being scattered, and an excellent effect is obtained in that connection failure between the coil and the external electrode can be prevented.

1 is an exploded perspective view of a laminated coil component according to an embodiment of the present invention. Perspective view of the laminated coil component Top view showing the main parts of the laminated coil component Top view showing a part of the manufacturing method of the laminated coil component Exploded perspective view of a conventional multilayer coil component Perspective view of the laminated coil component

  FIG. 1 is an exploded perspective view of a common mode noise filter which is an example of a laminated coil component according to an embodiment of the present invention, and FIG. 2 is a perspective view of the common mode noise filter.

  As shown in FIGS. 1 and 2, the common mode noise filter according to one embodiment of the present invention includes a laminate 13 obtained by laminating a plurality of rectangular insulating sheets 11 and 12, and the laminate. 13, first and second coils 14, 15 formed in the interior of the first and second coils 14, 15, and two first lead conductors 14 a connected to both ends of the first and second coils 14, 15, A second lead conductor 15a and external electrodes 16 respectively connected to the lead conductors 14a and 15a are provided.

  In the above configuration, the insulating sheets 11 and 12 are composed of a nonmagnetic layer 11 and a magnetic layer 12. This non-magnetic layer 11 is composed of first to seventh non-magnetic layers 11a to 11g, which are laminated in order from the bottom, and are not ferromagnetic materials such as Cu-Zn ferrite, glass, and the like. The sheet is made of a nonmagnetic material such as ceramic. And the nonmagnetic material part 17 which has the 2nd-6th nonmagnetic material layers 11b-11f is comprised.

  The magnetic layer 12 is formed on the lower surface of the first nonmagnetic material layer 11a and the upper surface of the fifth nonmagnetic material layer 11e. Further, the magnetic material layer 12 is made of an insulating material such as Ni—Cu—Zn. The sheet is formed of ferrite or the like. Then, the first nonmagnetic layer 11a on the lower surface of the magnetic layer 12 positioned on the lower surface of the first nonmagnetic layer 11a, and the upper surface of the magnetic layer 12 positioned on the upper surface of the first nonmagnetic layer 11a. The seventh non-magnetic layer 11g is located at the top.

  The number of sheets constituting the nonmagnetic layer 11 (first to seventh nonmagnetic layers 11a to 11g) and the magnetic layer 12 is not limited to the number shown in FIG.

  Furthermore, the laminated body 13 includes a plurality of insulator sheets (first to seventh nonmagnetic layers 11a to 11g, magnetic layer 12) and second to sixth nonmagnetic layers 11b to 11f. The non-magnetic body portion 17 and the first and second coils 14 and 15 formed inside the non-magnetic body portion 17 are configured.

  The first and second coils 14 and 15 are each formed by spirally plating or printing a conductive material such as silver.

  The first coil 14 is constituted by two spiral coil conductors 18, the second coil 15 is constituted by two spiral coil conductors 19, and the coil conductor 18 constituting the first coil 14. And the two coil conductors 19 which comprise the 2nd coil 15 are arrange | positioned alternately.

  Further, the two coil conductors 18 constituting the first coil 14 are the upper surfaces of the second and fourth nonmagnetic layers 11b and 11d, and the two coil conductors 19 constituting the second coil 15 are the third ones. And are formed on the upper surfaces of the fifth non-magnetic layers 11c and 11e, respectively.

  At this time, a part of the coil conductor 18 constituting the first coil 14 is arranged at substantially the same position in top view, and the winding direction is also the same direction. Similarly, the coil conductor 19 which comprises the 2nd coil 15 is arrange | positioned in the substantially same position by the top view, and the winding direction is also made into the same direction.

  The coil conductors 18 constituting the first coil 14 are connected to each other via via electrodes 18a, and the coil conductors 19 constituting the second coil 15 are connected to each other via via electrodes 19a. The via electrodes 18a are provided at the same position when viewed from above, and the via electrodes 19a are also provided at the same position when viewed from above. The via electrodes 18a and 19a are formed by drilling holes at predetermined locations of each non-magnetic layer and filling the holes with silver.

  The ends of the two coil conductors 18 constituting the first coil 14 are respectively connected to the first lead conductor 14a, and the ends of the two coil conductors 19 constituting the second coil 15 are respectively Connected to the second lead conductor 15a.

  The first lead conductor 14 a and the second lead conductor 15 a are formed so as to be exposed from the side surface 13 a to the end surface 13 b of the multilayer body 13. That is, the first lead conductor 14a and the second lead conductor 15a are disposed at any one of the four corners of each insulator layer. Note that the two first lead conductors 14a and the two second lead conductors 15a are not positioned at the same four corners of the corners of each insulator layer.

  Further, one or a plurality of notches 20 are formed in exposed portions of the first lead conductor 14a and the second lead conductor 15a.

  Here, FIG. 3 illustrates a state in which the coil conductor 19 constituting the second coil 15 is arranged on the fifth nonmagnetic layer 11e as the insulator sheet. As shown in FIG. 3, the second lead conductor 15a is formed at any one of the four corners of the fifth nonmagnetic layer 11e, exposed from the fifth nonmagnetic layer 11e, and further exposed. A notch 20 is formed in the portion. In FIG. 1, one notch 20 is formed on one exposed side of the fifth nonmagnetic layer 11 e and two on the other side, but the notch 20 is formed as shown in FIG. 3. A plurality of the two non-exposed sides of the fifth nonmagnetic layer 11e may be provided, and the notch 20 may also be formed in the corner portion 21 of the nonmagnetic layer 11a.

  When the cutout 20 is only one of the two exposed sides of the insulator sheet, one of the exposed sides of the insulator sheet where the cutout 20 is not formed is cut when cut into individual pieces. Since the area of the lead conductors 14a and 15a is not reduced, the stress applied to the lead conductors 14a and 15a at the time of cutting is not reduced, and the connection strength between the lead conductors 14a and 15a and the external electrode 16 is deteriorated.

  Furthermore, the exposed portions of the two first lead conductors 14a and the two second lead conductors 15a are connected to the external electrode 16, respectively. That is, the first and second coils 14 and 15 are electrically connected to the external electrode 16 through the lead conductors 14a and 15a. Further, the external electrode 16 is provided integrally with the four corners of the laminated body 13 as viewed from the top, that is, from the side surface 13a to the end surface 13b, and on the upper and lower surfaces. The external electrode 16 is formed by firing a silver paste, and further includes a nickel plating layer formed by plating on the surface and a tin plating layer formed by plating on the surface of the nickel plating layer. A plated layer (not shown) is provided.

  In order to enhance the magnetic coupling between the first coil 14 and the second coil 15, the magnetic body portion 22 is penetrated through the second to sixth nonmagnetic body layers 11 b to 11 f as shown in FIG. 1. It may be formed.

  In addition, as shown in FIG. 4, the method for manufacturing the common mode noise filter includes a vertical division unit 23 and a horizontal division unit 24. The vertical division unit 23 and the horizontal division unit 24 form one common mode noise filter. After forming the sheet 26 in which the corresponding element portion 25 is divided, the coil conductors 18 and 19 are formed in each element portion 25, and then the sheet 26 is divided by dicing or the like at the vertical division portion 23 and the horizontal division portion 24. Into individual pieces. In FIG. 4, for simplicity of explanation, one element portion 25 is a portion where the coil conductor 19 constituting the second coil 15 is formed, and four element portions 25 are shown. In practice, a laminate 13 having the structure shown in FIG. 2 is obtained by laminating a similar sheet-like insulator layer and another coil conductor.

  In FIG. 4, the second lead conductor 15a of the coil conductor 19 formed in each of the four element portions 25 is continuous, and the notch portion 20 is also formed continuously with the adjacent second lead conductor 15a. . Further, a notch 20 is also formed in a corner portion 21 (a portion where the side surface 13a and the end surface 13b of the laminated body 13 are in contact) of the insulator layer where the vertical division portion 23 and the horizontal division portion 24 intersect. Accordingly, since the cut portion 20 can be formed in the corner portion 21 where the stress applied to the lead conductors 14a and 15a at the time of cutting is the largest because the cutting is performed in both the vertical direction and the horizontal direction, the lead conductor 14a at the time of cutting. , 15a can be further reduced.

  The number of the notches 20 is one in the element portion 25, two in the vertical division portion 23, two in the horizontal division portion 24, and one in a portion 21 where the vertical division portion 23 and the horizontal division portion 24 intersect. However, the present invention is not necessarily limited to this, and even if the number of the notches 20 provided in the vertical division portion 23 and the number of the notches 20 provided in the horizontal division portion 24 are different. Good. Furthermore, in order to reduce the stress due to cutting and to make it easy to achieve both the connectivity between the coils 14 and 15 and the external electrode 16, the notch 20 has an area of the exposed surface of the lead conductors 14 a and 15 a. The total area is preferably approximately halved.

  As described above, in the common mode noise filter according to the embodiment of the present invention, the lead conductors 14a and 15a are formed so as to be exposed from the side surface 13a to the end face 13b of the multilayer body 13, and the lead conductors 14a and 15a Since the cutout portion 20 is formed in the exposed portion, the area of the lead conductors 14a and 15a cut when cutting into individual pieces is reduced, thereby reducing the stress applied to the lead conductors 14a and 15a during cutting. Therefore, the stress applied to the lead conductors 14a and 15a at the time of cutting can be made smaller than the adhesive force between the lead conductors 14a and 15a and the laminated body 13, and as a result, part of the lead conductors 14a and 15a is scattered. Therefore, it is possible to prevent the connection failure between the coils 14 and 15 and the external electrode 16.

  Here, the first lead conductor 14a and the second lead conductor 15a are not exposed only on the side surface 13a of the multilayer body 13 or only on the end surface 13b. This is because the connectivity between the first lead conductor 14a and the second lead conductor 15a and the external electrode 16 is deteriorated. When the first lead conductor 14a and the second lead conductor 15a are integrally exposed on the side surface 13a and the end surface 13b of the multilayer body 13, the connectivity with the external electrode 16 is improved, but the stress during cutting is increased. Therefore, in the present invention, the cutout portion 20 is formed in the first lead conductor 14a and the second lead conductor 15a.

  The coil conductor 18 constituting the first coil 14 may be sandwiched between the coil conductors 19 constituting the second coil 15, and the coil conductor 18 constituting the first coil 14, A part of the coil conductor 19 constituting the second coil 15 may be linear instead of spiral.

  In the embodiment of the present invention, the common mode noise filter has been described as an example of the laminated coil component. However, the present invention can also be applied to other laminated coil components such as an inductor and an inductor array.

  The laminated coil component according to the present invention has an effect of preventing connection failure between the coil and the external electrode, and is particularly common mode noise used in various electronic devices such as digital devices, AV devices, and information communication terminals. This is useful in filters and the like.

11 Non-magnetic layer (insulator sheet)
12 Magnetic layer (insulator sheet)
DESCRIPTION OF SYMBOLS 13 Laminated body 14 1st coil 14a 1st extraction conductor 15 2nd coil 15a 2nd extraction conductor 16 External electrode 20 Notch

Claims (2)

A laminate obtained by laminating insulator sheets, a coil formed inside the laminate, a lead conductor connected to both ends of the coil, and an external electrode connected to the lead conductor And the lead conductor is formed so as to be exposed from a side surface to an end face of the multilayer body, and a cutout portion is formed in an exposed portion of the lead conductor. The multilayer coil component according to claim 1, wherein the notch is provided at a location where a side surface and an end surface of the multilayer body are in contact.

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