JP2011040596A - Method of manufacturing coil component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a coil component in which a first core and an exterior core 3 can be easily bonded. <P>SOLUTION: The method of manufacturing the coil component includes an element assembly preliminary step of preparing a drum core 2 having a second external surface 22B and a second arcuate part 22E, the exterior core 3 having a first end surface 4B and a first internal surface 4A, and projections 41, 42 provided to the first internal surface 4A and having ends positioned at intersections of the first internal surface 4A and first end surface 4B, a core arranging step of arranging the drum core 2 and exterior core 3 with the projections 41, 42 brought into contact with the second arcuate part 22E so as to form an adhesive filled space between the second arcuate part 22E and first internal surface 4A, and a coating step of coating a coated region defined on the first end surface 4B with an adhesive 10B for bonding the drum core 2 and exterior core 3, and injecting the adhesive 10B into the adhesive filled space from a gap formed between the projections 41, 42 and the second arcuate part 22E by capillarity. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a coil component, and more particularly to a method for manufacturing a coil component in which a first core and a second core are bonded with an adhesive to manufacture the coil component.

  Conventionally, a coil component in which an outer core (second core) is mounted on a drum core (first core) around which a winding is wound, and a closed magnetic circuit is formed is known. As a method for attaching the outer core to the drum core, as disclosed in Patent Document 1, a method is disclosed in which the outer core is attached to the drum core in a state where an adhesive is applied to the bonding surface of the drum core and the outer core. ing.

JP 2007-299915 A

  Along with the downsizing of the coil component, the adhesive surface to which the adhesive is applied becomes smaller, and it becomes difficult to apply the adhesive over the entire adhesive surface. Before attaching the outer core to the drum core, it is necessary to apply an adhesive to the adhesive surface in advance, but if the adhesive surface becomes smaller, an appropriate amount of adhesive should be applied each time considering the dimensional error of the core. Was required, and it was difficult to control the amount of adhesive. Therefore, an object of this invention is to provide the manufacturing method of the coil components which can adhere | attach a 1st core and a 2nd core easily even if it is a small coil component.

  In order to solve the above-described problems, the present invention provides a first core having a wound winding having a first core end surface and a first core adhesive surface intersecting the first core end surface, and a second core end surface. One of a second core having a second core bonding surface intersecting the second core end surface, a terminal electrode to which the end of the winding is connected, and the first core bonding surface and the second core bonding surface Or it is provided on both and protrudes from the first core bonding surface or the second core bonding surface and ends at the intersection of the first core bonding surface and the first core end surface or the intersection of the second core bonding surface and the second core end surface. A first body end face and a second core end face are adjacent to each other, and are provided on either the first core adhesive face or the second core adhesive face. The first core bonding surface by contacting the protrusions with either the first core bonding surface or the second core bonding surface. A core arranging step of arranging the first core and the second core so as to form an adhesive filling space between the two core bonding surfaces, and an adhesive for bonding the first core and the second core, The adhesive is applied to the coated area including the portion where the protrusion contacts the first core bonding surface or the second core bonding surface, which is defined on one or both of the core end surface and the second core end surface. There is provided a manufacturing method of a coil component comprising: an application step in which a gap formed between an adhesive surface or a second core adhesive surface is injected into an adhesive filling space by capillary action.

  According to such a method, even if it is a small coil component and the adhesive surface is narrow, an appropriate amount of adhesive can be applied to the area to be coated by, for example, dropping it and filling the appropriate amount by capillary action. It can be injected and filled into the space. Therefore, even when a dimensional error occurs without being affected by the area of the bonding surface, a suitable amount of the adhesive can be filled in the adhesive filling space and the first core and the second core can be bonded.

  In the said manufacturing method, a terminal electrode is provided in any one of a 1st core and a 2nd core, and the to-be-coated area | region to which an adhesive agent is apply | coated in an application | coating process is either one of a 1st core and a 2nd core. Preferably it is defined.

  According to such a method, adhesion of the adhesive to the terminal electrode is suppressed. Since the terminal electrode is a portion that is electrically connected to the substrate when the coil component is mounted, the adhesion of the adhesive is suppressed, so that connection failure between the coil component and the substrate is suppressed.

  In addition, the first core and the second core are configured such that one of the first core end surface and the second core end surface protrudes from the other, and the application area to which the adhesive is applied in the application process is the first area. It is preferable that the other end of the one core end surface and the second core end surface is defined.

  According to such a method, the wall of the core that protrudes when applying the adhesive acts as a wall that prevents the adhesive from flowing from one of the first core and the second core to the other side. Works.

  Moreover, it is preferable that the to-be-coated area | region where an adhesive agent is apply | coated in an application | coating process is each prescribed | regulated on the both-surfaces side by the boundary of the top part of a projection part in a 1st core end surface or a 2nd core end surface.

  According to such a method, the adhesive can smoothly flow into both sides of the protrusion.

  According to the method for manufacturing a coil component of the present invention, the first core and the second core can be easily bonded even if the coil component is small.

The disassembled perspective view of the coil components which concern on embodiment of this invention. The top perspective view of the coil component which concerns on embodiment of this invention. The bottom perspective view of the coil component concerning an embodiment of the invention. Sectional drawing along the IV-IV line of FIG. Explanatory drawing which concerns on glass layer formation of the coil components which concern on embodiment of this invention. The top view in the state which combined the drum core and exterior core of the coil components which concern on embodiment of this invention. Sectional drawing along the VII-VII line of FIG. The top view of the state which started filling UV curing resin between the 2nd collar part of the coil components which concern on embodiment of this invention, and an exterior core. The top view of the state which finished filling UV curing resin between the 2nd collar part of the coil components which concern on embodiment of this invention, and an exterior core. Sectional drawing of the state filled with a thermosetting resin between the upper collar part and exterior core of the coil components which concern on embodiment of this invention.

  Hereinafter, a coil component according to an embodiment of the present invention will be described with reference to FIGS. A coil component 1 shown in FIG. 1 is mainly composed of a drum core 2, an exterior core 3, a winding 6, and a terminal electrode 7, and has a small outer dimension of about 2.0 to 5.0 mm. It is a product.

  The drum core 2, which is the first core, is provided with conductivity using a magnetic material containing manganese, for example, Mn-Zn ferrite as a base material. As shown in FIGS. 1 and 4, the substantially cylindrical core portion 23 is provided. And a first flange portion 21 and a second flange portion 22 that are provided coaxially at both ends in the central axis direction of the core portion 23. The first collar portion 21 and the second collar portion 22 have the same shape and are configured such that the projection shapes match in the axial direction of the core portion 23.

  As shown in FIG. 4, one end of the core part 23 is connected to the first collar part 21 and the first inner surface 21 </ b> A facing the second collar part 22, and the drum core 2 in the axial direction of the core part 23. A first outer surface 21B which is an end surface of the first end surface and is a smooth surface, and a first peripheral surface 21C which is located between the first inner surface 21A and the first outer surface 21B and intersects the first outer surface 21B is defined. Yes. As shown in FIG. 1, the first peripheral surface 21C is composed of a pair of first arc portions 21E, 21E connecting the pair of first straight portions 21D, 21D and the pair of first straight portions 21D, 21D. Moreover, in the 1st collar part 21, the maximum distance from one 1st circular arc part 21E to the other 1st circular arc part 21E becomes longer than the distance from one 1st linear part 21D to the other 1st linear part 21D. It is configured. In the first flange portion 21, the first outer surface 21B acts as a suction surface (upper surface) when the coil component 1 is sucked and mounted, and the first arc portions 21E and 21E are bonded to the outer core 3. Acts as a core bonding surface.

  The other end of the core portion 23 is connected to the second flange portion 22 and the second inner surface 22A facing the first flange portion 21 and the other end side end surface of the drum core 2 in the axial direction of the core portion 23. A second outer surface 22B that is the first core end surface and is a smooth surface, and a second peripheral surface 22C that is located between the second inner surface 22A and the second outer surface 22B and intersects the second outer surface 22B. ing. The second outer surface 22B is configured to be substantially parallel to the first outer surface 21B, and the second peripheral surface 22C is a pair connecting the pair of second straight portions 22D and 22D and the pair of second straight portions 22D and 22D. Second arc portions 22E and 22E.

  In the second collar portion 22, the maximum distance from one second arc portion 22E to the other second arc portion 22E is longer than the distance from one second linear portion 22D to the other second linear portion 22D. It is comprised so that it may become. Therefore, a direction from one second arc portion 22E to the other second arc portion 22E is defined as a longitudinal direction, and a direction from one second linear portion 22D to the other second linear portion 22D is defined as a short direction. To do. In the second flange portion 22, the second outer surface 22B acts as a mounting surface (lower surface) mounted on a substrate (not shown) when the coil component 1 is sucked and mounted, and the second arc portions 22E and 22E are exterior parts. It acts as a first core bonding surface bonded to the core 3.

  The core portion 23 has a core portion peripheral surface 23A located between the first inner surface 21A and the second inner surface 22A. In the drum core 2, a space 2 a (FIG. 4) in which the winding 6 is accommodated is formed in a portion surrounded by the winding core peripheral surface 23 </ b> A, the first inner surface 21 </ b> A, and the second inner surface 22 </ b> A.

  The drum core 2 having the above-described configuration is made of a conductive material, and insulation is achieved by coating the surface with an insulating glass layer 8 (FIG. 4). When the glass layer 8 is coated on the drum core 2, as shown in FIG. 5, a plurality of drum cores 2 are provided in a barrel 9 that includes a spray nozzle 91 at the center and rotates around the axis of the spray nozzle 91 as a rotation axis. To accommodate. The spray nozzle 91 is configured to be able to spray a glass slurry in which fine powder glass, a binder, or the like is suspended.

  In this state, glass slurry is sprayed from the spray nozzle 91 and sprayed onto the drum core 2 for coating. After the glass slurry layer is formed on the drum core 2, dry air of about 70 degrees is put into the barrel 9 to dry the glass slurry layer formed on the drum core 2. Thereby, a layer of glass fine powder is formed on the drum core 2. Thereafter, the drum core 2 is fired, and unnecessary binder components are volatilized and burned to melt (soften) the glass powder, thereby forming the glass layer 8 having a smooth surface.

  In the drum core 2, the core part peripheral surface 23A, the first inner surface 21A, and the second inner surface 22A are surfaces that define a space 2a that is a recess. Further, since the coating method is merely spray coating, the sprayed glass slurry is not sucked and adhered by the drum core 2 itself as in, for example, electrostatic coating. Therefore, compared with the 1st outer surface 21B and the 1st peripheral surface 21C of the 1st collar part 21, and the 2nd outer surface 22B and the 2nd circumferential surface 22C of the 2nd collar part 22, the glass slurry sprayed in the space 2a. Is difficult to adhere. Therefore, as shown in FIG. 4, the thickness of the glass layer 8 in the space 2a (the core portion peripheral surface 23A, the first inner surface 21A, and the second inner surface 22A) is thinner than the first outer surface 21B and the like. Become. Specifically, the average thickness of the glass layer 8 on the first outer surface 21B and the like is about 10 μm, whereas the average thickness of the glass layer 8 on the first inner surface 21A and the second inner surface 22A is about 5 μm. The average thickness of the glass layer 8 on the core peripheral surface 23A is about 3 μm, and the outer peripheral portion of the drum core 2 such as the first outer surface 21B is directed to the core peripheral surface 23A, which is the inner side of the drum core 2. The glass layer 8 is thin.

  Although the winding 6 is accommodated in the space 2a, the space 2a can be made large by thinning the glass layer 8 in the space 2a. Therefore, the number of turns of the winding 6 can be increased, or a large-diameter winding 6 can be used, so that the characteristics of the coil component 1 can be improved.

  As shown in FIG. 1, the outer core 3 is composed of a first divided core 4 and a second divided core 5, and the first divided core 4 and the second divided core 5 have the same shape. Therefore, in the following description, the first divided core 4 will be described as a representative, and the description of the second divided core 5 will be omitted unless otherwise specified.

  The first split core 4 is made of a magnetic material containing nickel, for example, Ni—Zn ferrite as a base material, and has insulating properties. As shown in FIG. 4, the first peripheral surface 21C and the second peripheral surface 22C The first inner surface 4A facing the first inner surface 4A intersecting the first inner surface 4A and being mounted on the drum core 2, the first end surface 4B positioned in the vicinity of the first outer surface 21B, and the first inner surface 4A intersecting the first inner surface 4A and mounted on the drum core 2. And a second end face 4C located in the vicinity of the second outer surface 22B. 4 A of 1st inner surfaces are comprised by the circular arc shape along the 1st circular arc part 21E and the 2nd circular arc part 22E, The circular arc direction length is the circumferential direction length of the 1st circular arc part 21E and the 2nd circular arc part 22E. It is comprised so that it may become substantially the same. The first inner surface 4A functions as a second core bonding surface bonded to the first arc portion 21E and the second arc portion 22E, and the second end surface 4C functions as a second core end surface.

  As shown in FIG. 4, the first end surface 4B and the second end surface 4C are configured to be smooth and parallel to each other. In the first split core 4, the distance from the first end face 4 </ b> B to the second end face 4 </ b> C (the thickness of the first split core 4) is the axial direction of the drum core 2 coated with the glass layer 8 and includes the glass layer 8. The distance between the first outer surface 21B and the second outer surface 22B (thickness of the drum core 2) is slightly shorter.

  As shown in FIG. 1, a first protrusion 41 and a second protrusion 42 are provided on the first inner surface 4 </ b> A at positions substantially near both ends in the arc direction. The first projecting portion 41 and the second projecting portion 42 are in the direction in which the first split core 4 is mounted on the drum core 2 and coincides with the axial direction of the drum core 2 (the thickness direction of the first split core 4). And is configured to protrude from the first inner surface 4A toward the first peripheral surface 21C and the second peripheral surface 22C.

  Since the 1st projection part 41 and the 2nd projection part 42 can be comprised with sufficient dimensional accuracy, it is prescribed | regulated by the 1st projection part 41 and the 2nd projection part 42, and the drum core 2 and the exterior core 3 (1st division | segmentation core) 4), the dimensional accuracy of the space (adhesive filling spaces 4a, 4b, 5a, 5b described later) is also increased. By increasing the dimensional accuracy, the magnetic gap between the drum core 2 and the outer core 3 is stabilized, so that the direct current superimposition characteristics of the coil component 1 can be stably improved.

  The leading end portions in the projecting direction of the first projecting portion 41 and the second projecting portion 42 are configured to have an R shape in a cross section orthogonal to the axial direction, and the first ridge line is the apex of the R shape portion. The second arc portions 21E and 22E are configured to come into contact with each other. Therefore, when the first protrusion 41 and the second protrusion 42 are in contact with the first and second arc portions 21E and 22E, respectively, a single point in the cross section perpendicular to the axial direction in contact with the R-shaped portion at the tip. A very narrow gap is formed. In the second end face 4C, an application area to which a UV curable resin 10B described later is dropped and applied is defined around the vicinity of the first protrusion 41 and the vicinity of the second protrusion 42, respectively. The coated area includes each of the end surface of the first protruding portion 41 and the end surface of the second protruding portion 42 that are flush with the second end surface 4C, and the coated region includes the first protruding portion. 41 and the second projecting portion 42 are respectively defined on both side surfaces with the top of each projecting portion having a substantially bowl shape as a boundary.

  As shown in FIG. 1, the second divided core 5 also has a second inner surface 5A, a first end surface 5B, and a second end surface 5C having the same shape as the first divided core 4, and the second inner surface 5A includes A first protrusion 51 and a second protrusion 52 are provided.

  As shown in FIG. 3, the terminal electrode 7 is made of nickel and tin after a silver paste is applied and baked on the surface of the glass layer 8 of the second flange portion 22 in a state where the glass layer 8 is formed on the drum core 2. As shown in FIGS. 3 and 6, the first electrode 71 connected to one end of the winding 6 by thermocompression bonding and the other end of the winding 6 connected by thermocompression bonding are formed. It is comprised from the 2nd electrode 72 wired. By forming the terminal electrode 7 on the drum core 2, the exterior core 3 can be mounted on the drum core 2 in a state where the winding 6 is wound around the core portion 23 and connected to the terminal electrode 7. This configuration facilitates the manufacture of the coil component 1.

  The first electrode 71 is disposed across the second outer surface 22B and one second linear portion 22D of the second peripheral surface 22C, and one end of the winding 6 is connected at the position of the first second linear portion 22D. Yes. The second electrode 72 is disposed across the second outer surface 22B and the other second linear portion 22D of the second peripheral surface 22C, and the other end of the winding 6 is connected at the other second linear portion 22D position. ing. When the coil component 1 is mounted on a substrate (not shown) by arranging the terminal electrode 7 on the pair of second straight portions 22D and 22D that are short in the second flange portion 22, one mounting location The distance from the (first electrode 71) to the other mounting location (second electrode 72) can be shortened. Thereby, the rigidity with respect to the bending which generate | occur | produces in the mounting substrate which is not shown in figure is improved, and it is suppressed that the coil component 1 is damaged.

  Further, since the terminal electrode 7 is provided on the surface of the glass layer 8, insulation between the drum core 2 is maintained. The terminal electrode 7 may be provided by bonding a copper metal fitting to the second flange portion 22 after the glass layer 8 is formed.

  The drum core 2, the first divided core 4 and the second divided core 5 in a state where the winding 6 is wound and connected to the terminal electrode 7 are flush with the first outer surface 21B and the first end surfaces 4B and 5B. The thermosetting resin 10A, which is an adhesive based on a thermosetting epoxy resin, and the UV curable resin 10B, which is an adhesive based on an ultraviolet curable resin. Glue together.

  Hereinafter, a method of bonding the drum core 2 and the exterior core 3 with the thermosetting resin 10A and the UV curable resin 10B will be described. First, as described above, the drum core 2 in which the glass layer 8 is formed and the terminal electrode 7 is formed and the winding 6 is wound and connected, and the outer core 3 (the first divided core 4 and the second divided core). 5) is prepared (element body preparation step).

  Next, as shown in FIG. 6, the first inner surface 4 </ b> A of the first divided core 4 faces one of the first arc portion 21 </ b> E and the second arc portion 22 </ b> E, and the second inner portion of the second divided core 5. The drum core 2 and the outer core 3 are arranged so that the inner surface 5A faces the other first arc portion 21E and the second arc portion 22E (core arrangement step). By arranging in this way, as shown in FIG. 7, an adhesive filling space 4a and an adhesive filling space 4b are defined between the first inner surface 4A and the first arc portion 21E and the second arc portion 22E, respectively. The adhesive filling space 5a and the adhesive filling space 5b are respectively defined between the second inner surface 5A and the first arc portion 21E and the second arc portion 22E.

  In the core arrangement step, as shown in FIG. 7, the first end surface 4 </ b> B of the first divided core 4, the first end surface 5 </ b> B of the second divided core 5, and the first of the drum core 2 are formed on the upper surface of the table S on which the bonding operation is performed. One outer surface 21B is in contact with each other, and these surfaces are arranged on the same surface. As described above, since the thickness of the first divided core 4 and the second divided core 5 is thinner than the thickness of the drum core 2, when the first end surface 4B, the first end surface 5B, and the first outer surface 21B are arranged flush, The second outer surface 22B of the drum core 2 protrudes from the second end surface 4C and the second end surface 5C, and steps are formed between the second outer surface 22B, the second end surface 4C, and the second end surface 5C.

  Next, as shown in FIG. 8, the UV curable resin 10 </ b> B is dropped from a nozzle (not shown) onto each application region of the second end surface 4 </ b> C and the second end surface 5 </ b> C (application step). The UV curable resin 10B has a viscosity of 300 to 10000 mPa · s, preferably 1000 to 5000 mPa · s at the time of application, and generally shows a liquid state with high fluidity. As described above, the coated area includes the end surfaces of the first protrusion 41 and the second protrusion 42, and the first protrusion 41, the second protrusion 42, and the second arc portion 22E. Since a very narrow gap is formed between the first and the second inner surface 4A, as shown in FIG. 9, the UV curable resin 10B dropped and applied to the application region is caused by capillary action from the gap. And filled in the adhesive filling space 4b between the second arc portion 22E (ultraviolet curable resin filling step).

  Capillary phenomenon is used to fill the UV curable resin 10B, so that even when the coil surface 1 is a small coil component 1 and the adhesive surface is narrow, the capillary tube can be obtained simply by dropping and applying an appropriate amount of adhesive to the application area. Depending on the phenomenon, an appropriate amount can be injected and filled into the adhesive filling space. Therefore, even if a dimensional error occurs between the drum core 2 and the exterior core 3 without being affected by the area of the surface to which the adhesive adheres, a suitable amount of adhesive is filled into the adhesive filling space, The exterior core 3 can be bonded.

  In addition, since the application regions are defined on both side surfaces with the tops of the first protrusion 41 and the second protrusion 42 in contact with the second arcuate portion 22E as the boundary, the adhesive filling space 4b. The space between the first protrusion 41 and the second protrusion 42 and the space outside this space are preferably filled.

  Since the second outer surface 22B protrudes and forms the above-mentioned step as compared with the second end surface 4C and the second end surface 5C where the application area is defined as described above, the second arc portion intersecting the second outer surface 22B. 22E becomes a wall, and the UV curable resin 10B applied to the application area is prevented from flowing out to the second outer surface 22B. In this way, by suppressing the outflow of the UV curable resin 10B to the second outer surface 22B, it is possible to prevent the UV curable resin 10B from adhering to the terminal electrode 7 and to suppress poor connection when the terminal electrode 7 is mounted. Can do.

  After each of the adhesive filling spaces 4b and 5b is filled with the UV curable resin 10B, the filled UV curable resin 10B is irradiated with ultraviolet rays by an ultraviolet irradiation device (not shown) (ultraviolet irradiation step). Since the coil component 1 is small as described above, the UV curable resin 10B filled in the adhesive filling spaces 4b and 5b is instantaneously cured by the irradiation of ultraviolet rays, and the drum core 2 and the exterior core 3 are bonded. In the adhesion with the UV curable resin 10B, since no external force is applied to the drum core 2 and the exterior core 3 other than dropping the UV curable resin 10B, the drum core 2 and the exterior core 3 move from a state where they are placed on the table S. That is suppressed. Therefore, a shift between the drum core 2 and the outer core 3 is suppressed.

  Since the UV curable resin 10B has high fluidity as described above, it can be suitably filled even if the space in which the coil component 1 is small is filled is narrow. The cured UV curable resin 10B is interposed between the first inner surface 4A and the second arc portion 22E, covers the first protrusion 41 and the second protrusion 42 within the above-described step, and the drum core 2 and the exterior. A fillet 10 </ b> C is formed so as to straddle the core 3. In this way, by forming the fillet 10C with the UV curable resin 10B and bonding the drum core 2 and the exterior core 3, it is possible to increase the bonding area and increase the bonding strength.

  Next, as shown in FIG. 10, the drum core 2 and the outer core 3 are reversed so that the second outer surface 22 </ b> B is placed on the upper surface of the table S. In this state, the thermosetting resin 10A is placed on the adhesive filling spaces 4a and 5a, and then the thermosetting resin 10A is filled into the adhesive filling spaces 4a and 5a with a spatula (not shown) (thermosetting). Resin filling step). Thereafter, the drum core 2 and the outer core 3 are moved into a heating furnace (not shown) and heated to heat and cure the thermosetting resin 10A (heating step). Since the drum core 2 and the outer core 3 are already bonded with the UV curable resin 10B, a new misalignment or the like occurs between the drum core 2 and the outer core 3 when the thermosetting resin 10A is filled and heated. There is no. Since the adhesion by the thermosetting resin 10A is strong, the drum core 2 and the exterior core 3 can be reliably adhered together with the adhesion by the UV curable resin 10B.

  By the above process, the bonding between the drum core 2 and the outer core 3 is completed, and the coil component 1 is completed. In the coil component 1 completed by bonding by the above method, as shown in FIG. 9, the second outer surface 22B on which the terminal electrode 7 is provided protrudes compared to the first end surfaces 4B and 5B. According to such a configuration, since the second outer surface 22B is in surface contact with a substrate (not shown) with certainty, mounting defects can be reduced.

  The pair of second linear portions 22D and 22D provided with the first electrode 71 and the second electrode 72 are located between the first divided core 4 and the second divided core 5, respectively, and FIG. 3, as shown in FIG. 6, the first divided core 4 and the second divided core 5 are arranged in a contour that connects the peripheral surfaces forming the outer contour. According to such a configuration, the first electrode 71 and the second electrode 72 provided in the pair of second linear portions 22D and 22D are suppressed from contacting other electronic components and the like, and the pair of second linear portions It is possible to protect the connecting portion formed in 22D and 22D.

  The coil component and the method for manufacturing the coil component of the present invention are not limited to the above-described embodiments, and various improvements and modifications can be made within the scope described in the claims. For example, in the thermosetting resin filling step, the adhesive filling spaces 4a and 5a are filled by pushing the thermosetting resin 10A with a spatula or the like. However, the viscosity is not limited to this, and the viscosity is the same as that of the UV curable resin 10B. The provided thermosetting resin 10A may be prepared, and the adhesive filling spaces 4a and 5a may be filled with an adhesive by a capillary phenomenon as in the case of the UV curable resin 10B. Further, the viscosity of the UV curable resin 10B is not necessarily required to exhibit the above viscosity at room temperature, and it is sufficient to show the viscosity in the ultraviolet curable resin filling step. Further, the step between the drum core 2 and the outer core 3 is formed only on one side in the axial direction of the core portion 23. However, the step is not limited to this and is formed on both sides, and an adhesive fillet is formed on both steps. May be. According to such a configuration, since the bonding area can be further increased, the drum core and the exterior core can be bonded more firmly. In the present embodiment, the coil part in which the protrusion is provided on the exterior core side and the terminal electrode is provided on the drum core side has been described. However, the present invention is not limited thereto, and the protrusion is only on the drum core side, or the drum core side and the exterior core. The terminal electrode may be provided on both of the outer core and the terminal electrode.

DESCRIPTION OF SYMBOLS 1 .. Coil components 2 .. Drum core 2a .. Space 3 .. Outer core 4 .. First division core 4A ... First inner surface 4B ... First end surface 4C ... Second end surfaces 4a, 4b, 5a, 5b · · Adhesive filling space 5 · · Second divided core 5A · · Second inner surface 5B · · First end surface 5C · · Second end surface 6 · · Winding 7 · · Terminal electrode 8 · · Glass layer 9 · · Barrel 10A ·· Thermosetting resin 10B · · UV curable resin 10C · · Fillet 21 · · First collar 21A · · First inner surface 21B · · First outer surface 21C · · First circumferential surface 21D · · First linear portion 21E・ ・ First arc part 22 ・ ・ Second collar part 22A ・ ・ Second inner surface 22B ・ ・ Second outer surface 22C ・ ・ Second circumferential surface 22D ・ ・ Second straight part 22E ・ ・ Second arc part 23 ・ ・Core portion 23A..Core portion peripheral surface 41..First projection portion 42..Second projection portion 51..First projection Origin 52 ·· Second projection 71 · · First electrode 72 · · Second electrode 91 · · Spray nozzle

Claims (4)

A first core having a wound winding with a first core end face and a first core adhesion face intersecting the first core end face, a second core end face and a second core intersecting the second core end face A second core having a core bonding surface; a terminal electrode to which an end of the winding is connected; and the first core bonding surface and the second core bonding surface. Projecting from the first core adhesive surface or the second core adhesive surface, and ends at the intersection of the first core adhesive surface and the first core end surface or at the intersection of the second core adhesive surface and the second core end surface An element body preparing step for preparing a projecting portion where the portion is located
The first core end surface and the second core end surface are adjacent to each other, and the protrusion provided on one of the first core bonding surface and the second core bonding surface is connected to the first core bonding surface and the first core bonding surface. The first core and the second core so as to form an adhesive filling space between the first core adhesive surface and the second core adhesive surface in contact with either one of the second core adhesive surfaces. A core placement step of placing
An adhesive for bonding the first core and the second core is defined on either one or both of the first core end surface and the second core end surface, or the first core bonding surface or the second core bonding surface. The adhesive is applied to a region to be coated including a portion where the protrusion contacts, and the adhesive is caused by capillary action from a gap formed between the protrusion and the first core bonding surface or the second core bonding surface. And a coating process injected into the adhesive filling space. The terminal electrode is provided on one of the first core and the second core,
2. The method of manufacturing a coil component according to claim 1, wherein an application area to which the adhesive is applied in the application step is defined as one of the first core and the second core. The first core and the second core are configured such that one of the first core end surface and the second core end surface protrudes with respect to the other,
3. The application area to which the adhesive is applied in the application step is defined as the other of the first core end face and the second core end face. The manufacturing method of the coil components as described in 2.   The application area to which the adhesive is applied in the application step is defined on both side surfaces of the first core end surface or the second core end surface on the side of the top of the protrusion. A method for manufacturing a coil component according to any one of claims 1 to 3.

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