JP2018078223A - Lamination coil component and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lamination coil component capable of facilitating determination whether a formed conductor is defective or not in a visual inspection using images.SOLUTION: Disclosed lamination coil component includes: a non-magnetic material portion 11; and plural coils 15, 16 of conductors 14 constituted of Ag, which is formed in the non-magnetic material portion 11. The non-magnetic material portion 11 contains a transition metal. In the manufacturing method, the content of an oxide of the transition metal is controlled in a range of 0.1 to 5.0 wt.% with respect to an inorganic substance contained in the non-magnetic material.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a small and thin laminated coil component used for various electronic devices such as digital devices, AV devices, and information communication terminals, and a method for manufacturing the same.

  As shown in FIG. 4, a conventional multilayer coil component of this type includes a non-magnetic body portion 1, a first coil 2 made of Ag embedded in the non-magnetic body portion 1, and a second coil 2. The coil 3 and the magnetic part 4 laminated on the top and bottom of the non-magnetic part 1 were provided. Moreover, the nonmagnetic part 1 was formed by blending an inorganic material composed of a filler, amorphous glass, and the like and an organic material composed of a solvent, a plasticizer, and the like, and baking the mixture.

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

JP 2014-179570 A

  In the above-described conventional laminated coil component, since the color of the glass ceramic material constituting the non-magnetic body portion 1 is white, the color tone is close to that of the conductor made of Ag, whereby the non-magnetic body portion 1 and the conductor are separated. Since it becomes difficult to distinguish, there has been a problem that it is difficult to determine whether or not there is a poor formation of a conductor in an appearance inspection using an image even if it is attempted to check whether or not the conductor is defective.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to provide a laminated coil component in which it is easy to determine whether a conductor is poorly formed in an appearance inspection using images.

  In order to solve the above-mentioned object, the present invention includes a non-magnetic part and a coil made of a conductor formed of Ag and formed in the non-magnetic part, and a transition metal is contained in the non-magnetic part.

  Since the laminated coil component of the present invention can be colored on the non-magnetic body part by the transition metal contained in the non-magnetic body part, the color tone of the color of the non-magnetic body part and the color of the conductor composed of Ag can be changed. As a result, it is possible to easily separate the non-magnetic material portion from the conductor, and thus it is possible to easily determine whether or not the conductor is poorly formed in the appearance inspection by the image.

Sectional drawing of the common mode noise filter in one embodiment of this invention Perspective view of the common mode noise filter Diagram showing the relationship between the transition metal oxide content in the non-magnetic part and the insulation resistance of the non-magnetic part Cross section of a conventional common mode noise filter

  FIG. 1 is a cross-sectional view of a common mode noise filter as 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 FIG. 1, the common mode noise filter according to one embodiment of the present invention includes a nonmagnetic body portion 11, a first magnetic body portion 12 that sandwiches the nonmagnetic body portion 11, and a second magnetic body portion 13. And a conductor 14 embedded in the first nonmagnetic part 11 and made of Ag, and a first coil 15 and a second coil 16 made of the conductor 14.

  In the above configuration, the nonmagnetic body portion 11 is provided by laminating a plurality of nonmagnetic body layers, and the nonmagnetic body portion 11 (a plurality of nonmagnetic body layers) is made of amorphous glass and It is formed by firing a nonmagnetic material containing a crystalline filler, an additive added to prevent diffusion of Ag, and the like, and an oxide of Mn.

  Further, the plurality of non-magnetic layers are obtained by preparing a slurry obtained by mixing the above-described inorganic material and an organic material such as a plasticizer and a solvent, forming the slurry into a sheet, and baking it. After firing, the organic matter hardly remains in the nonmagnetic part 11. Further, the non-magnetic body portion 11 is colored light brown.

  The first magnetic body portion 12 is formed of a plurality of magnetic body layers made of a magnetic material such as Ni—Cu—Zn ferrite, which is laminated on the lower surface of the non-magnetic body portion 11 and configured in a sheet shape. Yes.

  The second magnetic body portion 13 is laminated on the upper surface of the nonmagnetic body portion 11, that is, the nonmagnetic body portion 11 is sandwiched between the first and second magnetic body portions 12 and 13, and The second magnetic body portion 13 is also composed of a plurality of magnetic layers made of a magnetic material such as Ni—Cu—Zn ferrite formed in a sheet shape.

  Further, the first coil 15 and the second coil 16 are embedded in the first non-magnetic body portion 11 and are each formed of a conductor 14 composed of a spiral conductor and a lead conductor. The conductors 14 constituting the first coil 15 and the second coil 16 are each formed by transferring plating Ag onto the nonmagnetic material layer or printing Ag paste. The first coil 15 and the second coil 16 are magnetically coupled to each other.

  The first coil 15 and the second coil 16 may be partially in contact with the first and second magnetic body portions 12 and 13, and the lower surface of the first magnetic body portion 12. Further, another nonmagnetic body portion may be laminated on the upper surface of the second magnetic body portion 13.

  And the laminated body 17 as shown in FIG. 2 is formed by the above-mentioned structure. Further, four external electrodes 18 are provided on both end surfaces of the laminate 17, and the external electrodes 18 are connected to both end portions of the first coil 15 and the second coil 16, respectively. Further, the external electrode 18 is formed by printing and baking a silver paste on the end face of the laminate 17 or printing a paste made of resin and silver, and a nickel plating layer is formed on these surfaces by plating. At the same time, a low melting point metal plating layer such as tin or solder is formed on the surface of the nickel plating layer by plating.

  In this laminated body 17, a colored nonmagnetic body portion 11 and first and second magnetic body portions 12 and 13 sandwiching the nonmagnetic body portion 11 are laminated.

As described above, in the common mode noise filter according to the embodiment of the present invention, since the nonmagnetic body portion 11 contains Mn which is a transition metal, the nonmagnetic body portion 11 can be colored. Therefore, the color tone of the non-magnetic body portion 11 and the color of the conductor 14 made of Ag can be kept away from each other, so that the non-magnetic body portion 11 and the conductor 14 can be easily distinguished. In this case, it is possible to accurately determine whether the conductor 14 is not formed on the end face of the multilayer body 17 or the defect such that the area is small has occurred.

  The transition metal to be contained in the nonmagnetic part 11 may be any transition metal oxide that can color the nonmagnetic part 11, for example, Cr, Mn, Fe, Co, Ni Cu or the like is preferably used. Especially, if Mn is used as the transition metal, it is more preferable because it can be colored in a light brown color that is common for electronic parts.

  Here, in order to contain the transition metal in the nonmagnetic body portion 11, it is necessary to first contain the transition metal oxide in the nonmagnetic material before firing. After the transition metal oxide is contained in the nonmagnetic material, the nonmagnetic material is made into a sheet, and the nonmagnetic body portion 11 and the first and second magnetic body portions 12 and 13 formed by stacking are stacked. After the laminated body 17 is formed, firing is performed, and then the external electrode 18 is formed to obtain a laminated coil component. It is considered that the transition metal oxide is taken into the glass during the firing process, and the transition metal remains in the resulting non-magnetic part 11.

  At this time, the content of the transition metal oxide in the inorganic material in the non-magnetic material before firing is set to 0.1 wt% to 5.0 wt%.

  If it is less than 0.1 wt%, the effect of coloring cannot be obtained. On the other hand, when the content of the transition metal oxide is increased, a large number of transition metal ions serving as charge carriers are present in the glass that is a constituent element of the non-magnetic body portion 11, and the insulating property is deteriorated.

  Here, FIG. 3 shows the relationship between the content of the transition metal oxide with respect to the inorganic substance in the nonmagnetic material before firing and the insulation resistance of the laminate 17 after firing.

As is clear from FIG. 3, when the content of the transition metal oxide with respect to the inorganic substance in the nonmagnetic material exceeds 5.0 wt%, the insulation resistance is less than 10 ⁸ Ω, so that it is 5.0 wt% or less. preferable.

  In the above-described embodiment, the nonmagnetic material is obtained by baking a nonmagnetic material obtained by mixing an inorganic material such as glass, a filler, an additive, and a transition metal oxide, and an organic material such as a plasticizer or a solvent. Although the part 11 is obtained, the same effect can be achieved even when a transition metal-containing glass obtained by adding a transition metal oxide in advance in the glass production stage by melting is used.

  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 a laminated inductor and a laminated inductor array.

  The multilayer coil component according to the present invention has an effect that it is easy to determine whether or not a conductor is poorly formed in an appearance inspection by an image, and is particularly used in digital devices, AV devices, information communication terminals, and the like. This is useful in a mode noise filter or the like.

11 Non-magnetic part 14 Conductor 15, 16 First and second coils

Claims (3)

A laminated coil component comprising a non-magnetic body part and a coil made of a conductor formed of Ag formed in the non-magnetic body part, and a transition metal contained in the non-magnetic body part. The multilayer coil component according to claim 1, wherein the transition metal is Mn. A method of manufacturing a laminated coil component in which the coil made of the conductor made of Ag is formed on the nonmagnetic body portion made of a nonmagnetic material containing the transition metal oxide, The manufacturing method of the laminated coil components which made content of an oxide 0.1 wt%-5.0 wt% with respect to the inorganic substance contained in the said nonmagnetic material.