JP4791270B2 - Magnetic element - Google Patents

Description

  The present invention relates to a magnetic element used as a noise filter, for example.

  Conventionally, as a magnetic element, two windings are wound around a core part of a core member, and a terminal electrode formed by bending a metal plate is fitted to a flange of the core member, and the end of the winding is A device connected to the terminal electrode is known (for example, Patent Document 1). Also, two windings are wound around the core part of the core member, and the ends of the wound windings are electrically connected to the smooth surface of the terminal electrode provided on the collar part by soldering or thermocompression bonding. Such a magnetic element is also known (for example, Patent Document 2).

JP 2003-234218 A (Claims) Japanese Patent Laid-Open No. 2000-133522 (FIGS. 1, 2, 8 to 12, etc.)

  However, in the magnetic element disclosed in Patent Document 1, the end of the winding is connected above the terminal electrode having a flat plate portion by solid phase diffusion bonding or welding. In such a connection method, when the magnetic element is downsized, it is difficult to accurately fix the end to the terminal electrode. Moreover, since the metal plate is used as the terminal electrode, the volume is occupied by the thickness of the metal plate. Furthermore, edges exist at the corners of the metal plate. For this reason, when the terminal is connected to the terminal electrode, the terminal may come into contact with the terminal electrode and break. Furthermore, since the terminal is connected to the flat portion of the terminal electrode, the connection between the terminal and the terminal electrode is unstable, and there is a risk that the terminal will be detached from the terminal electrode after the magnetic element is mounted on the substrate. . Further, the magnetic element disclosed in Patent Document 2 has a problem that productivity is lowered because a direction such as thermocompression bonding is used when connecting the end of the winding to the terminal electrode.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a magnetic material that can stably connect the end of the winding to the terminal electrode without increasing the outer dimension. An element is to be provided.

In order to solve the above-described problems, a magnetic element according to the present invention includes a drum core having a winding core portion and flange portions at both ends of the winding core portion, and a protruding portion protruding from the side of the flange portion , and a winding core. The winding wound around the part, the magnetic flux generated by the winding is shielded, the shield core covering at least a part of the winding core and the winding, and the end of the winding are electrically connected, and at least the protrusion The terminal element is provided with a terminal electrode provided on the surface of the part, and the end is entangled with the terminal electrode and then mounted on the substrate integrally with the terminal electrode by soldering .

  In such a configuration, the terminal electrode is provided at least on the surface of the protruding portion. Therefore, the end can be connected to the terminal portion by tying the end of the winding wire to the protruding portion. Therefore, the end can be easily and stably connected to the terminal electrode without using a method such as thermocompression bonding. As a result, it is possible to prevent the terminal from being detached from the terminal portion or from being disconnected. In addition, since the terminal electrode with the end entangled can be fixed to the substrate by soldering, productivity can be improved and cost can be reduced.

  Further, in addition to the above-described invention, in another aspect of the invention, the protrusion has a side surface provided flush with a surface of the flange portion mounted on the substrate, and the protrusion includes a step portion and a groove portion. And any one of the recesses is formed

  In the case of such a configuration, the protruding portion is provided flush with the surface of the flange portion on the side mounted on the substrate. In addition, since the terminal electrode is provided on the surface of the protruding portion, when the magnetic element is mounted on the substrate after the end is entangled with the terminal electrode, the end contacts the substrate reliably. For this reason, the end is integrated with the terminal electrode and bonded to the substrate. As a result, it is possible to prevent peeling of the plating electrode that occurs when mounting is performed using only the conventional plating electrode. Moreover, since any one of the step part, the groove part, and the recessed part is formed in the protruding part, it is possible to secure a space for tying the end between the mounting substrate and the terminal electrode. The terminal can be prevented from coming off from the terminal electrode.

  Further, according to another invention, in addition to the above-described invention, the terminal electrode is formed by covering at least the surface of the protruding portion with plating. In such a configuration, since the terminal electrode has a thin film form, the terminal electrode can be made thinner as compared with the case where the terminal electrode is formed of a metal plate or the like.

  According to another invention, in addition to the above-described invention, the mounting surface on the side mounted on the substrate in the collar portion is provided with a notch that is recessed from the mounting surface.

  When configured in this manner, the collar portion is divided into two regions by the cutout portion, so that the terminal electrodes can be prevented from coming into contact with each other and being short-circuited. Therefore, when soldering the end, it is possible to perform soldering in a portion perpendicular to the mounting substrate, and workability is improved. In addition, the divided region of the collar portion can be a part of the terminal electrode. For this reason, a mounting surface can be enlarged and it becomes possible to improve the reliability of a magnetic element.

  According to the present invention, the end of the winding can be stably connected to the terminal electrode without increasing the outer dimension of the magnetic element.

(First embodiment)
Hereinafter, a magnetic element 10 according to a first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing a configuration of a magnetic element 10 according to a first embodiment of the present invention, and shows a state in which a shield core 14 is separated while a surface that is not surface-mounted is turned upward. is there. FIG. 2 is a perspective view showing a configuration of the drum core 12 used in the magnetic element 10 according to the first embodiment of the present invention, and is a view showing a state in which a surface that is not surface-mounted is turned upward. FIG. 3 is a perspective view showing the configuration of the drum core 12 in the same manner, and shows a state in which the surface to be surface-mounted is turned upward. Further, FIG. 4 is a front view of the drum core 12 in FIG. In the following description, the arrow X1 direction shown in FIGS. 1 to 11 is forward, the arrow X2 direction is backward, the arrow Y1 direction is left, the arrow Y2 direction is right, the arrow Z1 direction is upward and arrow The Z2 direction is defined as the downward direction.

  As shown in FIG. 1, the magnetic element 10 includes a drum core 12, a shield core 14 disposed so as to cover the outside of the drum core 12, and a pair of windings 16 and 17 wound around the drum core 12 (see FIG. 5). ) And the terminal electrode 20.

  As shown in FIG. 2, the drum core 12 includes a prismatic core portion 24 and substantially flat front and rear flange portions 26 and 28 provided at both front and rear ends of the core portion 24. . Specifically, the front collar part 26 is provided in a substantially square flat plate shape, and a projecting part 34 is provided below the left side surface 30 and the right side surface 32 which are the left and right side surfaces of the front collar part 26. It protrudes outward. Each protrusion 34 has a substantially quadrangular prism shape.

  As shown in FIG. 3, the bottom surface 38 that is the surface mounted on the substrate in the front flange portion 26 and the bottom surface 34 a of each protrusion 34 are provided so as to be flush with each other. Here, as shown in FIG. 2 and FIG. 3, a notch 40 that is notched upward from the bottom surface 38 is formed at substantially the center in the left-right direction on the bottom surface 38 of the front collar portion 26. As shown in FIG. 3, the depth of the cutout of the cutout portion 40 does not reach the core portion 24 in the height direction. The bottom surface 38 is divided into two regions by the notch 40.

  In addition, the rear collar portion 28 is provided in a shape that is symmetrical with respect to the front collar portion 26 with the central portion in the longitudinal direction of the magnetic element 10 as a boundary. For this reason, the rear collar portion 28 is also provided with a projecting portion 34 and a notched portion 52 similar to the notched portion 40. In the present embodiment, the outer shape of the front collar part 26 and the rear collar part 28 are the same shape (symmetrical shape), but may be different shapes.

  The drum core 12 is made of a magnetic material such as nickel-based ferrite. However, as the material of the drum core 12, for example, a magnetic material such as permalloy, sendust, iron or carbonyl, or a nonmagnetic material such as ceramic or resin may be used.

  In addition, terminal electrodes 20 are formed on the bottom surface 38 and the projecting portion 34, respectively, which can be electrically connected to the outside. However, the terminal electrode 20 may be formed not only on the bottom surface 38 and the protruding portion 34 but also on the entire circumference of the front collar portion 26 and the rear collar portion 28 from the bottom surface 38 to the depth of the cutout portion 40. The terminal electrode 20 is formed by plating the bottom surface 38 and the protruding portion 34. Examples of the plating treatment include electroless plating and electrolytic plating capable of depositing a plating metal in a solution, but other methods such as hot plating and vacuum plating may be employed. When the drum core 12 is surface-mounted on the substrate, a portion of the terminal electrode 20 on the bottom surface 38 side contacts the substrate. And when the said terminal electrode 20 contacts a board | substrate, the conduction | electrical_connection of the board | substrate and the windings 16 and 17 mentioned later is attained.

  5 and 6 show an example of a technique for winding the windings 16 and 17 around the drum core 10. Among these, FIG. 5 is a view for explaining the configuration of a pair of windings 16 and 17 wound around the drum core 10, and is a side sectional view in a state where the windings 16 and 17 are wound around the drum core 12. is there. FIG. 6 is a plan view showing a state in which the windings 16 and 17 are wound around the drum core 12 and showing a state in which the surface to be surface-mounted is turned upward.

  As shown in FIG. 5, a pair of windings 16 and 17 covered with an insulating film are wound around the outer periphery of the core portion 24. In FIG. 5, the windings 16 are wound at the same number of turns so that the winding 16 is a lower layer and the winding 17 is an upper layer. Further, as shown in FIG. 6, the ends 16a and 16b of the winding 16 are pulled out from the core portion 24 and are entangled with the protruding portion 34 located on the upper side in FIG. That is, the ends 16a and 16b are connected to the terminal electrode 20 located on the upper side in FIG. On the other hand, the ends 17a and 17b of the winding wire 17 are pulled out from the winding core portion 24 and are entangled with the protruding portion 34 located on the lower side in FIG. That is, the ends 17a and 17b are connected to the terminal electrode 20 located on the lower side in FIG.

  When insulation between the windings 16 and 17 cannot be ensured only by the insulating coating formed on the windings 16 and 17, a member such as an insulating sheet is interposed between the windings 16 and 17. You may let them. The material of the windings 16 and 17 is preferably a metal having excellent conductivity such as copper, but may be a metal such as stainless steel, iron or aluminum.

  As shown in FIG. 1, the windings 16 and 17 are wound around the winding core portion 24, and the ends 16 a, 16 b, 17 a, and 17 b of the drum core 12 are entangled with any of the protruding portions 34. The shield core 14 is disposed from above.

  FIG. 7 is a perspective view of the magnetic element 10 according to the first embodiment of the present invention. FIG. 8 is a front view of the magnetic element 10 in FIG. 7 as viewed from the direction indicated by the arrow B.

  As shown in FIGS. 7 and 8, the front shape of the shield core 14 has a U shape. The shield core 14 is made of a magnetic material such as nickel-based ferrite. However, as the material of the shield core 14, for example, a magnetic material such as permalloy, sendust, iron, or carbonyl may be used. The shield core 14 is disposed above the drum core 12 and closes both the upper side and the left and right sides of the drum core 12. In a state where the shield core 14 is disposed above the drum core 12, the inner side surface 14 a (see FIG. 1) that is the inner surface of the shield core 14 is the left side surface 30, the right side surface 32, and the upper side surface 33 of the front flange portion 26. (Hereinafter, when referring to the left side surface 30, the right side surface 32, and the upper side surface 33, they are simply referred to as the side surface 31 (see FIG. 2)), and the left side surface 30, the right side surface 32, and the upper side surface 33 of the rear collar portion 28 are in close contact with each other. Then touch. The drum core 12 and the shield core 14 are fixed by interposing an adhesive between the inner side surface 14a and the side surfaces 31 of the front flange portion 26 and the rear flange portion 28, respectively.

  Further, as shown in FIG. 8, in a state where the shield core 14 is disposed above the drum core 12, a space between the left lower end surface 14 b of the shield core 14 and the protruding portion 34 and a right lower end surface 14 c of the shield core 14 is provided. A gap H is formed between the protrusion 34 and the protrusion 34.

  The magnetic element 10 is mounted on the substrate from the bottom surface 38 side in a state where the ends 16a, 16b, 17a, and 17b are entangled with the protruding portion 34. At this time, the magnetic element 10 is fixed to the substrate by applying solder so as to cover the outside of the protruding portion 34.

  In the magnetic element 10 configured as described above, the terminal electrode 20 is formed on the surface of the protruding portion 34 formed integrally with the front collar portion 26 and the rear collar portion 28. Therefore, the ends 16a, 16b, 17a, and 17b of the windings 16 and 17 can be connected to the terminal electrode 20 by tying the terminals 16a, 16b, 17a, and 17b to the terminal electrode 20 and then soldering. Further, when connecting the ends 16a, 16b, 17a, 17b to the terminal electrode 20, it is not necessary to use a method such as thermocompression bonding. Accordingly, the ends 16a, 16b, 17a, and 17b can be easily and stably connected to the terminal electrode 20. Therefore, after the magnetic element 10 is mounted on the substrate, the ends 16a, 16b, 17a, 17b are not easily detached from the terminal electrode 20, and the reliability of the magnetic element 10 is improved. Further, since the terminal electrode 20 having the ends 16a, 16b, 17a, and 17b entangled can be fixed to the substrate by soldering, productivity can be improved and cost can be reduced.

  In the magnetic element 10, the side surface 34 a is formed to be flush with the bottom surface 38. Further, the terminal electrode 20 is formed on the surfaces of the side surface 34 a and the bottom surface 38. Therefore, when the magnetic element 10 is mounted on the substrate after the ends 16a, 16b, 17a, 17b are entangled with the terminal electrode 20, the ends 16a, 16b, 17a, 17b entangled with the terminal electrode 20 Contact securely. Furthermore, after the ends 16a, 16b, 17a, and 17b are entangled with the terminal electrode 20, they are mounted on the substrate together with the terminal electrode 20 by soldering. For this reason, the bonding strength between the terminal electrode 20 and the substrate is higher than that in the case of mounting with only the conventional plating electrode, and as a result, the reliability of the magnetic element 10 is improved.

  Further, in the magnetic element 10, the protruding portion 34 is provided at a position facing the lower end surface 14 b and the lower end surface 14 c of the shield core 14. Therefore, the terminal electrode 20 is provided in the space between the lower end surface 14b and the lower end surface 14c and the substrate. Therefore, the space between the lower end surface 14b and the lower end surface 14c and the substrate can be effectively utilized as the binding portion of the ends 16a, 16b, 17a, 17b, and as a result, the magnetic element 10 can be reduced in size. Is possible.

  Moreover, in the magnetic element 10, the terminal electrode 20 is formed by performing a plating process. Therefore, the terminal electrode 20 has a thin film form, and the terminal electrode 20 does not occupy a large volume. Therefore, the terminal electrode 20 can be made thinner than when the terminal electrode 20 is formed of a metal plate or the like. As a result, the magnetic element 10 can be prevented from increasing in size. Further, it is not necessary to provide the terminal electrode 20 as a separate member, and the number of parts can be reduced.

  In the magnetic element 10, a shield core 14 is disposed outside the drum core 12. Therefore, a closed magnetic path is formed between the drum core 12 and the shield core 14. Therefore, it is possible to increase the inductance of the windings 16 and 17 and to prevent the magnetic flux from leaking from the magnetic element 10 to the outside. As a result, it is possible to prevent noise and eddy current from being generated in various electric devices in which the magnetic element 10 is incorporated.

  Further, in the magnetic element 10, the front collar portion 26 and the rear collar portion 28 are divided into two regions by cutout portions 40 and 52, respectively. Therefore, the terminal electrodes 20 can be prevented from coming into contact with each other and short-circuited, and when the terminals 16a, 16b, 17a, and 17b are soldered, soldering is performed at a portion perpendicular to the mounting board. Workability is improved. In addition, the divided regions in the flange portions 26 and 28 can be a part of the terminal electrode 20. For this reason, a mounting surface can be enlarged and the reliability of the magnetic element 10 can be improved.

(Second Embodiment)
Next, a magnetic element 70 according to a second embodiment of the present invention will be described with reference to the drawings. In the magnetic element 70 according to the second embodiment, portions common to the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.

  FIG. 9 is a perspective view showing the configuration of the magnetic element 70 according to the second embodiment of the present invention, and is a view showing a state in which a surface that is not surface-mounted is turned upward. FIG. 10 is a perspective view showing a configuration of the drum core 72 used in the magnetic element 70 according to the second embodiment of the present invention, and is a view showing a state in which a surface that is not surface-mounted is turned upward. FIG. 11 is a front view of the drum core 72 in FIG. 10 as viewed from the direction indicated by the arrow C.

  As shown in FIG. 9, the magnetic element 70 includes a drum core 72, a shield core 74 disposed outside the drum core 72, a pair of windings (not shown) wound around the drum core 72, and a terminal electrode 76 ( 9 to 11), and is mainly configured.

  As shown in FIG. 10, the drum core 72 has a prismatic core part 80, and a substantially flat front part 82 and a rear part 84 provided at both front and rear ends of the core part 80. . Specifically, the front collar portion 82 is provided in a substantially square flat plate shape, and a projecting portion 90 is provided below the left side surface 86 and the right side surface 88 which are the left and right side surfaces of the front collar portion 82. It protrudes outward. As shown in FIG. 11, each of the protrusions 34 has a substantially quadrangular prism shape, and tapered grooves cut into diagonally inward sides on the upper and lower side surfaces 91a, 91a. 94, 94 are formed. That is, the protruding portion 90 is provided so that the depth of the protrusion 90 is increased from the upper and lower side surfaces 91a as it approaches the left side surface 86 and the right side surface 88. The recessed portion of the protruding portion 90 corresponds to the groove portion 94.

  Further, as shown in FIG. 11, a bottom surface 95 which is a surface mounted on the substrate in the front collar portion 82 and a side surface 91a on the mounting side of the protruding portion 90 are both provided flush with each other. The rear collar portion 84 has the same outer shape (symmetrical shape) as that of the front collar portion 82, and protrudes from the left side surface 86 and the right side surface 88 which are the left and right side surfaces of the rear collar portion 84. Each part 90 is provided.

  The drum core 72 is made of a magnetic material such as nickel-based ferrite. However, as the material of the drum core 72, for example, a magnetic material such as permalloy, sendust, iron or carbonyl, or a nonmagnetic material such as ceramic or resin may be used.

  Further, terminal electrodes 76 are formed on the four side surfaces 91a of the projecting portion 90 and the groove portions 94 and 94 (including part of the left side surface 86 and the right side surface 88). The terminal electrode 76 is formed by performing a plating process on the above portion. Examples of the plating treatment include electroless plating and electrolytic plating capable of depositing a plating metal in a solution, but other methods such as hot plating and vacuum plating may be employed.

  A pair of windings (not shown) covered with an insulating film is wound around the outer periphery of the winding core portion 80, and the ends of the windings are entangled with the groove portions 94 in the protruding portions 90.

  As shown in FIG. 9, in the magnetic element 70, a shield core 74 having a U-shaped cross section is disposed above the drum core 72. The lower end surface 74 b that is the left end surface of the shield core 74 and the lower end surface 74 c that is the right end surface are in contact with the upper side surface 91 a of the protrusion 90.

  In the magnetic element 70 configured as described above, the groove portion 94 is formed in the protruding portion 90. Therefore, a space for winding the end of the winding between the mounting substrate and the terminal electrode 76 can be secured, and the end can be reliably prevented from coming off from the protruding portion 90 or from being disconnected. . Therefore, it is possible to prevent a contact failure between the terminal and the terminal electrode 76, and to improve the reliability of the magnetic element 70.

  In the magnetic element 70, the lower end surfaces 74 b and 74 c of the shield core 74 are in contact with the side surface 91 a above the protruding portion 90. Therefore, it is possible to reliably prevent the magnetic flux from leaking from the magnetic element 70 to the outside. As a result, it is possible to more effectively prevent noise and eddy currents from being generated in various electric devices in which the magnetic element 70 is incorporated.

  Although the first and second embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be implemented in various modifications.

  In each of the above-described embodiments, the pair of windings 16 and 17 covered with the insulating film are wound around the outer periphery of the core parts 24 and 80, but are wound around the core parts 24 and 80. One winding may be used. The winding 16 is wound in a lower layer and the winding 17 is in an upper layer. However, the present invention is not limited to this, and the windings 16 and 17 may be wound in one layer. You may wind so that it may become three or more layers. The windings 16 and 17 are both wound with the same number of turns, but may be wound with different numbers of turns.

  Further, in the first embodiment described above, the protrusion 34 is not formed with a recess or a groove, but as shown in FIG. 12A, a stepped portion is formed on the side surface 34a on the bottom surface side of the protrusion 34. 105 may be provided. In addition, it is preferable that the magnitude | size of the dimension I of the depth direction of the step part 105 is the range of 0.05-0.1 mm. Further, as shown in FIG. 12B, a recess 106 may be provided on the side surface above the protrusion 34 and the side surface 34a on the bottom surface side. The recess 106 may be provided on either the upper side surface or the side surface 34a on the bottom surface side, or may be provided over the entire circumference of the side surface.

  Further, in the first embodiment described above, the ends 16a, 16b, 17a, 17b are entangled with the protrusion 34, but without providing the protrusion 34, as shown in FIG. The end portions 16a, 16b, 17a, and 17b may be entangled with the leg portions 107 and 108 that are divided into two by the cutout portions 40 and 52 in the 26 and the rear flange portion 28, respectively. At this time, the terminal electrode 20 is preferably provided not only on the side surface 34a on the bottom surface side but also on the surfaces of the legs 107 and 108.

  Further, in the first embodiment described above, the shield core 14 is a core having a U-shaped cross section, but is not limited to this shape. For example, as shown in FIG. The I-shaped core 109 may be disposed above the drum core 12.

  Further, in each of the above-described embodiments, the planar shape of the protrusions 34 and 90 has a quadrangular shape, but is not limited to this shape, and may be other shapes such as a circle or an ellipse. . Further, as shown in FIG. 15, the height of the protruding portion 34 may be provided high.

  In the first embodiment described above, the notches 40 and 52 are provided, but these may not be provided. At this time, the pair of terminal electrodes 20 and 76 in each of the front collar portions 26 and 82 and the rear collar portions 28 and 84 are formed in a state having a certain distance from each other. Further, in the second embodiment described above, the front collar portion 82 and the rear collar portion 84 are not provided with a notch portion, but may be provided with a notch portion as in the first embodiment. .

  Further, in the second embodiment described above, the groove portion 94 is formed at the base portion where the protruding portion 90 protrudes from the front flange portion 82 and the rear flange portion 84, but is not limited to this position. Instead, it may be formed at a position on the outer side, such as a substantially central portion in the protruding direction of the protruding portion 90. Moreover, although the groove part 94 is formed in the up-and-down side surface 91a in the protrusion part 90, you may make it form in any one of the up-and-down side and the front-and-back side surface 91a. Alternatively, three or more of these may be formed. Moreover, when forming the groove part 94 in two places of the protrusion part 90, you may make it form in the front and back side surface 91a.

  The magnetic element of the present invention can be used in various electric devices such as personal computers, mobile phones, and digital cameras.

It is a perspective view which shows the structure of the magnetic element which concerns on the 1st Embodiment of this invention, and is a figure which shows the state by which the surface which is not surface-mounted is turned up, and the shield core is isolate | separated. It is a perspective view which shows the structure of the drum core used for the magnetic element which concerns on the 1st Embodiment of this invention, and is a figure which shows the state which turned up the surface which is not surface-mounted. It is a perspective view which shows the structure of the drum core used for the magnetic element which concerns on the 1st Embodiment of this invention, and is a figure which shows the state which faced the surface mounted. It is the front view which looked at the drum core in FIG. 2 from the arrow A direction. It is a figure for demonstrating the structure of a pair of coil | winding wound by the drum core in FIG. 2, and is a sectional side view in the state which wound the coil | winding to the drum core. It is a top view of the state which wound the coil | winding around the drum core in FIG. 2, and is a figure which shows the state which faced the surface mounted surface up. 1 is a perspective view of a magnetic element according to a first embodiment of the present invention. It is the front view which looked at the magnetic element in FIG. 7 from the arrow B direction. It is a perspective view which shows the structure of the magnetic element which concerns on the 2nd Embodiment of this invention, and is a figure which shows the state which turned up the surface which is not surface-mounted. It is a perspective view which shows the structure of the drum core used for the magnetic element which concerns on the 2nd Embodiment of this invention, and is a figure which shows the state which turned up the surface which is not surface-mounted. It is the front view which looked at the drum core in FIG. 10 from the arrow C direction. It is a figure which shows the modification of this invention. It is a figure which shows the modification of this invention. It is a figure which shows the modification of this invention. It is a figure which shows the modification of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,70 ... Magnetic element 12, 72 ... Drum core 14, 74 ... Shield core 16 ... Winding 16a, 16b ... Terminal 17 ... Winding 17a, 17b ... Terminal 20, 76 ... Terminal electrode 24, 80 ... Core part 26, 82 ... Forehead (part of buttocks)
28, 84 ... Rear buttocks (part of buttocks)
34, 90 ... Projection

Claims (4)

A drum core having a winding core part and flanges at both ends of the winding core part, and a projecting part protruding from the side of the flange part;
A winding wound around the core;
A shield core that shields the magnetic flux generated by the winding and covers at least a part of the winding core and the winding;
A magnetic element having a terminal electrode provided at least on a surface of the projecting portion and electrically connecting the ends of the windings ;
A magnetic element, wherein the end is entangled with the terminal electrode and then mounted on the substrate integrally with the terminal electrode by soldering .   The protruding portion has a side surface provided flush with a surface of the flange portion mounted on the substrate, and the protruding portion is formed with any one of a stepped portion, a groove portion, and a recessed portion. The magnetic element according to claim 1.   The magnetic element according to claim 1, wherein the terminal electrode is formed by covering at least a surface of the protruding portion with plating.   4. The magnetic element according to claim 1, wherein a notch portion that is recessed from the mounting surface is provided on a mounting surface of the flange portion on the side mounted on the substrate. 5.

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