JP2019004000A - Inductor component and manufacturing method of the same - Google Patents

Abstract

To provide a manufacturing method that can more reliably provide an inductor component having an external electrode with high smoothness.SOLUTION: A manufacturing method of an inductor component having an external electrode constituted by first and second baked metal layers is provided which comprises the steps of: applying a first metal particle-containing paste to a component body before forming an external electrode to form a first layer to which a metal particle is applied; heating the component body accompanied by the first layer to which the metal particle is applied to obtain a first baked metal layer from the particle coating layer; further applying a second metal particle-containing paste to the first baked metal layer to form a second layer to which the metal particle is applied; and heating the first baked metal layer accompanied with the second layer to which the metal particle is applied and the component body to obtain the second baked metal layer from the second layer to which the metal particle is applied.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an inductor component and a manufacturing method thereof.

  Inductor components such as an inductor, a choke coil, and a transformer include a component main body that includes an inner conductor that forms a coil and an insulator base that embeds the inner conductor. An external electrode is provided on the outer side of the component main body for conduction with the outside of the inductor component. With recent multifunctionalization of portable devices, there is an increasing demand for downsizing and higher performance of electronic components inside the devices.

  In the invention described in Patent Document 1, two layers of electrode terminals (external electrodes) composed of a coat layer and a plating layer are arranged so as to cover the end portions of the internal electrodes exposed on the surface of the component main body. This external electrode improves the adhesion between the component surface and the plating layer by the glass component of the coating layer, and electrical connection is ensured by the metal particles contained in the coating layer and the plating layer of the outer layer. According to Patent Document 1, high moisture resistance can be obtained by this structure.

  In the technology that does not form a coat layer on the external electrode, a conductive paste is applied to one end surface of the component body by roller, and further dip coating is applied to the end surface, followed by defoaming and drying to form a conductive paste coating layer before baking. After that, the part body is inverted, and the conductive paste is applied to the other end face of the part body with a roller, further dip-applied to the end face, defoamed and dried, and the conductive paste coating layer before baking. Form. Thus, after forming a conductive paste coating layer on both end faces, a baking process is performed, whereby the conductive paste coating layer is baked to obtain a conductive metal layer. Subsequently, a product is obtained by performing plating formation of Ni and Sn. According to this technology, it is possible to secure the connectivity with the internal conductor by roller application to the end face of the component body, and to reduce the RDC of the external electrode by increasing the thickness of the external electrode by dip coating. By simultaneously dip-coating the external electrode also on a part of the side surface adjacent to the end surface, the external electrode coating area is increased, so that peeling of the external electrode is suppressed.

JP 2013-179268 A

  In view of miniaturization and high performance of electronic components, it is important to ensure the smoothness of the external electrode. However, in the above-described conventional technology, the smoothness of the external electrode may be impaired. In particular, with the progress of miniaturization, the ratio of the inner conductor portion to the element body increases, and accordingly, the ratio of the gap in the vicinity of the inner conductor tends to increase, and the smoothness of the external electrode is easily impaired. An object of the present invention is to provide a manufacturing method that can provide an inductor component having a highly smooth external electrode more reliably.

As a result of intensive studies by the inventor, the present invention as described below has been completed.
The inductor component includes a component main body including an inner conductor that forms a coil and an insulator base that embeds the inner conductor, and an external electrode is provided outside the component main body. In the present invention, the first metal particle-containing paste is applied to the component body to form the first metal particle coating layer, and this is baked to form the first baking metal layer from the first metal particle coating layer. Then, a second metal particle-containing paste is further applied on the first baking metal layer to form a second metal particle coating layer, which is then baked to remove the second metal particle coating layer from the second metal particle coating layer. A baked metal layer is obtained. The first and second baking metal layers constitute external electrodes. In this way, an inductor component having an external electrode is obtained.

  According to the present invention, an inductor component having an external electrode with high smoothness can be obtained.

It is model explanatory drawing of an example of the manufacturing method of this invention. It is model explanatory drawing of an example of the manufacturing method of this invention. It is a schematic explanatory drawing of an example of the manufacturing method of a prior art. It is a schematic explanatory drawing of an example of the manufacturing method of a prior art.

  The present invention will be described in detail with appropriate reference to the drawings. However, the present invention is not limited to the illustrated embodiment, and in the drawings, the characteristic portions of the invention may be emphasized and expressed, so that the accuracy of the scale is not necessarily guaranteed in each part of the drawings. Not.

  In the present invention, an inductor component having a component body and an external electrode is manufactured. The external electrode is provided on the surface of the inductor component and is intended to conduct to the outside. The component body is a portion of the inductor component other than the external electrode. An exposed portion of the internal conductor is provided on the surface of the component main body, and the external electrode is specifically provided so as to cover the exposed portion of the internal conductor exposed on the surface of the component main body. FIG. 1 is a schematic explanatory view of an example of the production method of the present invention. FIG. 1A shows the component main body 10 before forming the external electrodes. The configuration of the component main body 10 is not particularly limited, and examples thereof include a configuration in which an internal conductor 12 made of a conductive material is embedded in an element body 11 made of an insulator. In addition, there is no limitation in particular about the structure of a component main body, a manufacturing method, etc., The prior art in an inductor component can be referred suitably.

  In the component main body 10 of FIG. 1A, a gap or moisture 17 exists in a part between the inner conductor 12 and the element body 11. This gap or moisture 17 is not intended, and as will be described later, the gap or moisture 17 causes the smoothness of the external electrode to be impaired. It is preferable that the gap or moisture 17 does not exist originally, but such residual defects tend to increase more and more due to the miniaturization of parts. In the following description, it becomes clear that the smoothness of the external electrode is improved by the manufacturing method of the present invention even when such an unintended gap or moisture 17 exists.

  According to the present invention, the first metal particle coating layers 13a and 13b are formed on the component body 10 as shown in FIG. The first metal particle coating layers 13a and 13b eventually become part of the external electrode. The metal particle-containing paste for obtaining a metal particle coating layer as referred to in the present invention is a generic term for a liquid or fluid semi-solid containing at least metal particles, and includes, for example, a narrow definition including metal particles, a solvent, and a resin. Non-limiting examples include pastes, slurries, inks, and dip coating liquids. The metal particle coating layer is formed by coating a metal particle-containing paste, and is fixed to such an extent that a certain shape as a layer can be maintained under normal temperature and pressure. However, the individual metal particles contained in the metal particle coating layer exist as individual particles, and as a general rule, it is necessary to fix the entire layer so that it can be regarded as one conductor by metal bonding or baking. Not reached. The metal particle-containing paste for obtaining the first metal particle coating layers 13a and 13b is referred to as a first metal particle-containing paste.

  The means for applying the first metal particle-containing paste is not particularly limited, and examples thereof include application by a roller and application by dip coating. When apply | coating with a roller, use of the metal particle containing paste whose viscosity in 25 degreeC is about 5000-50000 mPaS is preferable. In the case of application by dip coating, it is preferable to use a metal particle-containing paste having a viscosity at 25 ° C. of about 10,000 to 60000 mPaS. Since it is preferable that the first metal particle coating layers 13a and 13b have a thin coating thickness, coating with a roller is preferable. During application, the unintended gap or moisture 17 may be maintained as it is.

  Next, by baking the first metal particle-containing paste after coating, the first metal particle coating layers 13a and 13b are first processed as shown in FIG. 1 (C) and FIG. 1 (D). Baking metal layers 13A and 13B are obtained. The thickness of the first baked metal layer is preferably 10 to 80 μm. The baked metal layer consists of metal particles that are baked together to form the entire layer as one conductor, and glass is added to lower the baked temperature and improve the overall strength of the layer. Also good. When the first baking metal layers 13A and 13B are obtained from the first metal particle coating layers 13a and 13b, the baking may be performed suddenly, but preferably after the defoaming process and the drying process, the baking process is performed. Done. The defoaming process is a means for removing a part of bubbles caused by air or the like entrained during the coating included in the first metal particle coating layers 13a and 13b. The drying process is a means for removing the liquid component contained in the first metal particle coating layers 13a and 13b. Unlike the baking process, the drying process is a concept that does not include baking metal particles. As a specific example of the defoaming treatment, a treatment is performed for about 10 to 60 seconds under a reduced pressure of 600 to 755 mmHg. As a specific example of the drying treatment, heating to 100 to 200 ° C can be mentioned. When the drying process is performed, dripping of the metal particle-containing paste can be prevented, and in order to prevent dripping, it is possible to carry out batch baking after a certain amount has been accumulated without applying baking immediately after application. Improves. The baking conditions may be appropriately set according to the type of metal used. For example, when silver is used, the baking temperature may be 650 to 750 ° C.

  During the baking process, the gap or moisture 17 forms voids 18 due to the volume expansion of air inside the gap due to the amount of heat of baking and the amount of moisture vaporized due to the amount of heat of baking. When the metal particles are burned by the baking treatment, the air in the formed void 18 expands in a sealed state, and eventually the void 18 bounces and reaches the recess 19.

Here, the use of gaps, voids, air and bubbles in the present invention will be described.
From the viewpoint of preventing defects, the inner conductor and the element body are preferably in contact with each other, and from the viewpoint of electrical characteristics, it is desirable that no stress is generated between the inner conductor and the element body. For this reason, it is desirable that the inner conductor and the element body are loosely in contact with each other so that no stress is generated. However, this is a difficult technology in practice, and in actual products, the electrical characteristics are emphasized and the internal characteristics are emphasized. The conductor and the element body may not be in contact.
In the present invention, such a gap or gap in a portion where the inner conductor is not in contact with the element body is referred to as a gap. In particular, with the progress of miniaturization of parts, the ratio of the inner conductor portion to the element body increases, and accordingly, the ratio of the gap near the inner conductor tends to increase. The inside of the gap is not a vacuum but usually contains a gas component, and in some cases, moisture or the like is present. This gas component is mostly air and may contain other gas components, but in the present invention, it is typically referred to as air.
On the other hand, a small gap or a small defect caused by air or the like that is involved in the coating included in the metal particle coating layer is referred to as a bubble in the present invention. This air includes a gaseous component of the solvent, but in the present invention, most of the air is entrained at the time of application, and thus is referred to as air.
In the present invention, the void means a large defect space generated inside when the metal particle coating layer becomes a baked metal layer by the baking process. Bubbles and voids are selectively used depending on whether the formed layer is a metal particle layer before baking or a metal layer after baking. Since voids are generated by expansion of air or the like, it is a concept of a larger defect than bubbles.

  Next, as described in FIG. 1E, second metal particle coating layers 14a and 14b are formed on the first baking metal layers 13A and 13B. The second metal particle coating layers 14a and 14b eventually become part of the external electrode. The second metal particle coating layers 14a and 14b are formed by coating a second metal particle-containing paste. The requirements for the second metal particle-containing paste are the same as those for the first metal particle-containing paste, and the first metal particle-containing paste and the second metal particle-containing paste may be the same or different.

  The means for applying the second metal particle-containing paste is not particularly limited, and examples thereof include application by a roller and application by dip coating. The preferred viscosity range of the second metal particle-containing paste is the same as that of the above-described first metal particle-containing paste. By applying the second metal particle-containing paste, the inside of the dent 19 is filled with the second metal particle-containing paste, and the dent 19 is one of the second metal particle application layers 14a and 14b. Form part. From the viewpoint of more surely filling the dent 19 described above, application of dip coating is preferable when obtaining the second metal particle application layers 14a and 14b.

  Next, by baking the second metal particle-containing paste, as shown in FIG. 1 (F), the second baking metal layers 14A and 14B are formed from the second metal particle coating layers 14a and 14b. obtain. As in the case of obtaining the first baking metal layers 13A and 13B from the first metal particle coating layers 13a and 13b, it is preferable to perform a defoaming process and a drying process before the baking process. The conditions for the baking treatment may be set as appropriate according to the type of metal used, as in the case of obtaining the first baking metal layers 13A and 13B from the first metal particle coating layers 13a and 13b. The thickness of the second baked metal layer is preferably 30 to 80 μm. Preferably, the second baking metal layer is thicker than the first baking metal layer.

  Thus, the 1st and 2nd baking metal layers 13a-14b are obtained. These baked metal layers are used as external electrodes. The plurality of first and second baking metal layers 13a and 14a and 13b and 14b to be stacked may be integrated and recognized as one layer.

  In this way, the second baking metal layer reliably fills the concave portion generated in the first baking metal layer due to the presence of a gap or moisture in a part between the inner conductor and the element body. As a whole, it is possible to reliably eliminate a recess generated due to the presence of a gap or moisture in a part between the inner conductor and the element body, so that a highly smooth outer electrode can be obtained more reliably. be able to. The mechanism that produces these effects will be described in comparison with the prior art. FIG. 3 is a schematic explanatory diagram of an example of a conventional manufacturing method. In the manufacturing method of the prior art shown in FIG. 3, as shown in FIG. 3B, the component main body 30 having the element body 31 and the inner conductor 32 as shown in FIG. First metal particle application layers 33a and 33b are formed by application of silver paste or the like. At this time, as in the case of the embodiment shown in FIG. 1, it is assumed that an unintended gap or moisture 37 exists in a part between the element body 31 and the internal conductor 32. According to the prior art, a defoaming process and a drying process are then performed. As described above, in these defoaming treatment and drying treatment, the metal particles in the first metal particle coating layers 33a and 33b are not yet baked. In the defoaming and drying treatments, the amount of heat is less than that during baking, so there is no significant volume expansion of air, and air that has expanded through gaps between unbaked metal particles can be released to the outside. Therefore, the unintended gap or moisture 37 does not lead to significant expansion.

  According to the conventional technique, thereafter, as described in FIG. 3C, the second metal particle coating layers 34a and 34b are formed by dip coating or the like. Next, a baking process is performed to obtain first and second baking metal layers 33A to 34B from the first and second metal particle coating layers 33a to 34b, and these baking metal layers serve as external electrodes. The unintended gap or moisture 37 that originally existed is subjected to a void 38 as shown in FIG. 3D at a high temperature during the baking process, and finally shown in FIG. 3E. Such a recess 39 may be a factor that impairs the smoothness of the external electrode.

  As described above, when an unintended gap or moisture is included at the stage of obtaining the component main body 10, the prior art has been a factor that impairs the smoothness of the external electrode as shown in FIG. 3. On the other hand, in the present invention, as shown in FIG. 1, the factor does not manifest as a factor that impairs the smoothness of the external electrode.

  Next, as another factor that impairs the smoothness of the external electrode, a case where there is a bubble defect inside the metal coating layer will be described with reference to FIGS.

  FIG. 2 is a schematic explanatory view of an example of the production method of the present invention. In this manufacturing method, as shown in FIG. 2 (B), by applying silver paste or the like to the component body 20 having the element body 21 and the internal conductor 22 as shown in FIG. 2 (A). First metal particle coating layers 23a and 23b are formed. At this time, unintended bubbles 27 may be mixed in the first metal particle coating layers 23a and 23b. According to the present invention, after that, a baking process is performed, and the first metal particle coating layers 23a and 23b are changed to the first baking metal layers 23A and 23B. It is the same as the case of FIG. 1 that the defoaming process and the drying process are preferably performed prior to the baking process and prior to the baking process. The above-mentioned unintended bubbles 27 pass through a void 28 as shown in FIG. 2 (C) at a high temperature by the baking process, and the void is rebounded to a recess 29 as shown in FIG. 2 (D). And so on.

  According to the present invention, as described in FIG. 2 (E), the second metal particle coating layer 24a is then applied on the first baking metal layers 23A and 23B by applying the second metal particle-containing paste. , 24b. As in the case of FIG. 1, the inside of the dent 29 is filled with the second metal particle-containing paste by applying the second metal particle-containing paste. Thereafter, baking is performed again to obtain second baking metal layers 24A and 24B from the second metal particle coating layers 24a and 24b. The defoaming process and the drying process are preferably performed prior to the baking process, as in the case of FIG. Thus, the external electrode which consists of the 1st and 2nd baking metal layers 23A-24B is formed. The first and second baked metal layers may be integrated and grasped as an external electrode composed of a single layer, as in the case of FIG.

  According to the present invention, even if the unintended bubbles 27 are mixed in the first metal particle coating layer, the final paste is filled with the second metal particle-containing paste during the process of the manufacturing method. As a factor that impairs the smoothness of the external electrode that is obtained, it does not become obvious. By creating the external electrode separately into two layers, a first baking metal layer and a second baking metal layer, the voids caused by bubbles are simultaneously generated in the two layers constituting the same surface portion of the external electrode. Since the probability of forming a recess due to is less than the probability of forming a recess due to void bounce caused by bubbles in a single baked metal layer, an external electrode with higher smoothness can be obtained. Furthermore, the recesses generated in the first sewn metal layer can be reliably zeroed out by at least filling the recesses generated in the first seizure metal layer with the second seizure metal layer. Therefore, an external electrode with high smoothness can be obtained more reliably. Even if a concave portion is generated due to void bounce caused by air bubbles in the second seizure metal layer, the depth is smaller than the depth of the concave portion due to void bounce generated in a single seizure metal layer. As a result of the seizure metal layer being shallower, it is possible to obtain an external electrode having higher smoothness than the conventional one. The depth of the recess is less than 80% of the thickness of the external electrode in contact with the component main body as viewed in the cross section of the end surface of the component main body. By setting it as this range, the swelling around a recessed part can be made small, the influence on a dimension can be suppressed, and the smoothness calculated | required by an external electrode can be ensured. For example, if it is in this range, it is not detected by an appearance inspection such as image processing, and the mountability can be sufficiently secured. For this purpose, the depth of the concave portion of the first baking metal layer is preferably less than 60%. Hereinafter, the effect will be compared with the prior art.

  FIG. 4 is a schematic explanatory diagram of an example of a conventional manufacturing method. In the manufacturing method of the prior art shown in FIG. 4, as described in FIG. 4B, the component main body 40 having the element body 41 and the inner conductor 42 as shown in FIG. First metal particle coating layers 43a and 43b are formed by coating silver paste or the like. At this time, as in the case of the embodiment shown in FIG. 2, a case is assumed in which an unintended bubble 47 exists inside the first metal particle layer. According to the prior art, a defoaming process and a drying process are then performed. As described above, in these defoaming treatment and drying treatment, the metal particles in the first metal particle coating layers 43a and 43b are not yet baked. In the process of the defoaming process and the drying process, the unintended bubbles 47 do not expand significantly.

  According to the prior art, thereafter, as described in FIG. 4C, the second metal particle coating layers 44a and 44b are formed by dip coating or the like. Next, a baking process is performed to obtain first and second baking metal layers 43A to 44B from the first and second metal particle coating layers 43a to 44b, and these baking metal layers serve as external electrodes. The above-mentioned unintended air bubbles 47 pass through a void 48 as shown in FIG. 4D at a high temperature during the baking process, and finally as a dent 49 as shown in FIG. This may be a factor that impairs the smoothness of the external electrode.

  Thus, if unintended bubbles are included during the formation of the first metal particle coating layer, the prior art has been a factor that impairs the smoothness of the external electrode as shown in FIG. On the other hand, in the present invention, as shown in FIG. 2, the factor does not manifest as a factor that impairs the smoothness of the external electrode.

  As described above in detail, according to the manufacturing method of the present invention, even if gaps, bubbles, or moisture which are not intended during the manufacture of the component main body or in the initial stage of external electrode manufacturing are mixed, the manufacturing method of the present invention. Due to these steps, the smoothness of the external electrode due to the gaps, bubbles, and moisture is less likely to be manifested. The inductor component thus obtained is also an embodiment of the present invention.

  Except for the above, the specific configuration of the inductor component is not particularly limited, and the prior art can be referred to as appropriate for pre-processing and post-processing. For example, in FIG. 1 and FIG. 2, two baking processes are illustrated, but the baking process may be increased to three or more. The type of metal of the external electrode is not particularly limited, and for example, silver can be used. After the baking treatment, plating with Ni, Sn, or the like may be performed, and a film of Ni, Sn, or the like may be formed by a method other than plating. As for the causes of voids, there are cases where there is a gap or moisture in a part between the inner conductor and the element body, and cases where there are bubbles remaining due to air entrainment during coating inside the metal layer before baking. However, these may be combined. Even in other cases, the present invention can be applied to defects in which voids are generated due to the volume expansion of the air in the voids and a recess is formed in the film. Moreover, the structure in the following Examples can also be taken in suitably.

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the embodiments described in these examples.

(Example)
A component body having a length of 3.2 mm, a width of 2.5 mm, and a thickness of 2.5 mm was dried at 150 ° C. for 120 minutes. Thereafter, a silver paste having a viscosity of 30000 mPaS at 25 ° C. was applied to both end faces of the component main body with a roller to form a first metal particle coating layer derived from a silver paste having a thickness of 40 μm. Next, after drying under reduced pressure of 700 mmHg for 20 seconds, it was dried at 150 ° C. for 10 minutes, and further solidified by baking at 680 ° C. for 10 minutes. did. As a result, a first baked metal layer was obtained. A second metal particle coating layer having a thickness of 50 μm was obtained on the first baked metal layer by dip coating using a silver-containing dip coating solution having a viscosity of 40,000 mPaS at 25 ° C. Next, after drying under reduced pressure of 700 mmHg for 20 seconds, it was dried at 150 ° C. for 10 minutes, and further solidified by baking at 680 ° C. for 10 minutes. did. As a result, a second baked metal layer was obtained. In this way, an inductor component having an external electrode was obtained.

  Further, the baking of the first baking metal layer is performed under reduced pressure, so that the smoothness is improved, and the baking of the second baking metal layer is performed at a lower pressure than the baking of the first baking metal layer. be able to. The second baking metal layer can be baked under the same reduced pressure as that of the first baking metal layer, under a reduced pressure lower than this, or in the atmosphere to obtain the same effect. It is possible to improve productivity. Furthermore, by forming the first and second baked metal layers separately, each thickness can be formed thin, and the presence of voids existing inside the first and second baked metal layers can be reduced. As a result, the thickness as the external electrode can be reduced, and smoothness and uniformity can be increased. Moreover, although the thickness as the external electrode is thin, it is possible to secure roundness at the edge portion of the component main body by the first baking metal layer and to obtain further thickness by the second baking metal layer. It also suppresses cutting at

For the evaluation, the obtained inductor component was filled with resin, and a portion where the thickness of the external electrode was thin, that is, a so-called dent was detected by cross-sectional observation.
As a result, at the both ends of the 300 external electrodes of the product, there were 5 dents, and the depth was half the thickness of the external electrode.

(Comparative example)
A component body having a length of 3.2 mm, a width of 2.5 mm, and a thickness of 2.5 mm was dried at 150 ° C. for 120 minutes. Thereafter, a silver paste having a viscosity of 30000 mPaS at 25 ° C. was applied to one end face of the component main body with a roller to form a first metal particle coating layer derived from the silver paste having a thickness of 40 μm. A second metal particle coating layer having a thickness of 50 μm was obtained on the first metal particle coating layer by dip coating using a silver-containing dip coating solution having a viscosity at 25 ° C. of 40000 mPaS. Thereafter, after drying under reduced pressure at 700 mmHg for 20 seconds under reduced pressure, drying at 150 ° C. for 10 minutes was performed. Thereafter, the part main body is inverted, and the first and second metal particle coating layers are formed on the other end surface in the same manner as described above, and are dried at 150 ° C. for 10 minutes under reduced pressure drying that also serves as a defoaming treatment. Was dried. Thereafter, the metal particle coating layer was solidified by baking by baking at 680 ° C. for 10 minutes. In this way, an inductor component having a baked metal layer as an external electrode was obtained.

For evaluation, the obtained inductor component was filled with resin, and a dent was detected by cross-sectional observation.
As a result, there were 10 dents at both ends of the 300 external electrodes of the product, of which 5 dents were the same as the thickness of the external electrode and reached the part body.

10, 20, 30, 40: Parts main body 11, 21, 31, 41: Element body 12, 22, 32, 42: Internal conductors 13a, 13b, 23a, 23b, 33a, 33b, 43a, 43b: Metal particle coating layers 13A, 13B, 23A, 23B, 33A, 33B, 43A, 43B: Baking metal layer 17, 37: Crevice or moisture 27, 47: Bubbles 18, 28, 38, 48: Void 19, 29, 39, 49: Recess

Claims (6)

A method of manufacturing an inductor component comprising a component main body comprising an inner conductor forming a coil and an insulator substrate embedding the inner conductor, wherein an external electrode is provided outside the component main body,
Applying a first metal particle-containing paste to the component body to form a first metal particle application layer;
Baking the first metal particle coating layer to obtain a first baking metal layer;
A step of further applying a second metal particle-containing paste on the first baking metal layer to form a second metal particle coating layer; and baking the second metal particle coating layer to form a second baking metal layer. And get step by
The first and second baked metal layers constitute external electrodes;
A method for manufacturing an inductor component having an external electrode.   2. The manufacturing method according to claim 1, wherein the first baked metal layer is formed so as to cover an internal electrode exposed portion of the component main body.   The manufacturing method according to claim 1 or 2, wherein the first metal particle-containing paste is applied by a roller.   The manufacturing method according to claim 1, wherein the second metal particle-containing paste is applied by dip coating.   An inductor component having a component main body and an external electrode formed on the outside of the component main body, manufactured by the manufacturing method according to claim 1. An inductor component having a component body and an external electrode formed outside the component body,
The external electrode is composed of one or more layers distinguished for each material,
Having a recess on the surface of the external electrode;
An inductor component in which the depth of the recess is less than 80% of the thickness of the layer of the external electrode in contact with the component body.

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