Patent Publication Number: US-2022238272-A1

Title: Coil Component

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to Japanese Patent Application No. 2021-011704 filed Jan. 28, 2021 which is hereby expressly incorporated by reference herein in its entirety. 
     BACKGROUND 
     1. Technical Field 
     The present application relates to a coil component. 
     2. Related Art 
     For instance, there is a coil component that is described in Japanese Patent Publication Number 2007-273739. 
     The coil component that is described in Japanese Patent Publication Number 2007-273739 has a core molding (a core mold or a molded core), a coil, and a metal terminal. Specifically, the core molding is formed of a magnetic substance material. The coil has an embedded part that is embedded into the core molding and a protruding part that protrudes from the core molding. Further, the metal terminal is electrically connected to the protruding part. The core molding has a mounting surface, an upper surface, and a side surface. Specifically, the upper surface faces the opposite direction as the mounting surface. The side surface is orthogonal to the mounting surface and the upper surface. The metal terminal has a first planar part, a second planar part, and a third planar part. Specifically, the first planar part is arranged along the side surface of the core molding. The second planar part is connected to an upper end of the first planar part and is arranged along the upper surface of the core molding. Further, the third planar part is connected to a lower end of the first planar part and is arranged along the mounting surface of the core molding. A recessed part is formed in the upper surface of the core molding. The second planar part of the metal terminal is arranged at the recessed part. 
     The coil components explained above may be subjected to a vacuum and held by a mounter that has a suction nozzle during, for example, a mounting process. 
     According to the investigation and experiments of the inventors of the present application, there is room for improvement in the configuration of the coil component that is described in Japanese Patent Publication Number 2007-273739 from the view point of the mounter performing the suction more stably. 
     SUMMARY 
     The present application attempts to solve the above problem and achieve the above improvement. An object of the present application is to provide a coil component that has a configuration that enables a mounter to perform a suction more stably. 
     According to one aspect of the present application, a coil component includes a core body, a coil, and a metal terminal. The core body is formed of a magnetic material. The core body has a mounting surface, an upper surface, the upper surface and the mounting surface being outwardly opposite to each other, and a first side surface joining (crossing) the mounting surface and the upper surface. The coil has an embedded part embedded in the core body, and a first protruding part protruding from the core body. The metal terminal is electrically connected to the first protruding part of the coil. The metal terminal has a first plate arranged along the first side surface of the core body, a second plate continuously connected to an upper end of the first plate and arranged along the upper surface of the core body, and a third plate continuously connected to a lower end of the first plate and arranged along the mounting surface of the core body. Further, a leading edge of the second plate is recessed toward the upper end of the first plate to form a first arc-shaped part. The upper surface of the core body has a first recess in which the second plate is arranged. The first recess has a second arc-shaped part at a portion facing the first arc-shaped part. The second arc-shaped part extends along a contour of the first arc-shaped part. 
     According to the present application, a suction by a mounter can be performed more stably. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view (a diagram that shows a front surface and a right side surface) that shows a coil component according to embodiments of the present application. 
         FIG. 2  is a front view that shows the coil component according to the embodiments of the present application. 
         FIG. 3  is a rear view that shows the coil component according to the embodiments of the present application. 
         FIG. 4  is a left side view that shows the coil component according to the embodiments of the present application. 
         FIG. 5  is a right side view that shows the coil component according to the embodiments of the present application. 
         FIG. 6  is a plan (top) view that shows the coil component according to the embodiments of the present application. 
         FIG. 7  is a bottom view that shows the coil component according to the embodiments of the present application. 
         FIG. 8A  is a plan (top) perspective view that shows the coil component according to the embodiments of the present application.  FIG. 8B  is a front perspective view that shows the coil component according to the embodiments of the present application. 
         FIG. 9  is a cross-sectional view (a front cross-sectional view) along the line A-A shown in  FIG. 8A  according to the embodiments of the present application. 
         FIG. 10  is a partial enlarged plan (top) view that shows the coil component according to the embodiments of the present application. 
         FIG. 11  is a perspective view that shows a core body (alternately, a core, a core molding, a core mold, or a molded core) and a protruding part (protrusion) of a coil of the coil component according to the embodiments of the present application. 
         FIG. 12  is a plan (top) perspective view that shows the core body and the coil of the coil component according to the embodiments of the present application. 
         FIG. 13  is a bottom perspective view that shows the core body and the coil of the coil component according to the embodiments of the present application. 
         FIG. 14  is a perspective view that shows a metal terminal of the coil component according to the embodiments of the present application. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Embodiments according to the present application are explained below with reference to  FIGS. 1-14 . In regards to the embodiments, redundant explanations with respect to the same configurations are omitted but the same reference numerals are used for labeling in the drawings. 
     As shown in any drawing among  FIGS. 1-14 , a coil component  100  according to the embodiments of the present application has a core body  10  (alternately, a core, a core molding, a core mold, or a molded core), a coil  60 , and a metal terminal(s)  50 . Specifically, the core body  10  is formed of (made of or includes) a magnetic substance material (magnetic material). The coil  60  has an embedded part  61  that is embedded in the core body  10  (for instance, shown in  FIGS. 8A and 9 ) and a protruding part(s) (a first protruding part  62  and a second protruding part  63 , for instance, shown in  FIG. 8A ) that protrudes from the core body  10 . Further, the metal terminal  50  is electrically connected to the protruding part of the coil  60 . 
     The core body  10  has a mounting surface  11  (for instance, shown in  FIG. 7 ), an upper surface  12 , and a side surface(s). Specifically, the upper surface  12  faces an opposite side to the mounting surface  11 . In other words, the mounting surface  11  and the upper surface  12  are outwardly opposite to each other. The side surfaces join (cross) (or are orthogonal to) the mounting surface  11  and the upper surface  12 . For instance, the side surfaces are a front surface  13 , a rear surface  14 , a left side surface  15 , a right side surface  16 , a front left surface  21 , a rear left surface  22 , a rear right surface  23 , and a front right surface  24 . 
     The metal terminal  50  has a first planar part (first plate)  51 , a second planar part (second plate)  52 , and a third planar part (third plate)  53 . Specifically, the first planar part  51  is arranged along the side surface of the core body  10 . The second planar part  52  is continuously connected to an upper end (edge) of the first planar part  51  and is arranged along the upper surface  12  of the core body  10 . Further, the third planar part  53  is continuously connected to a lower end (edge) of the first planar part  51  and is arranged along the mounting surface  11  of the core body  10 . The first, second, and third planar parts  51 ,  52 , and  53  are integrally formed. In other words, a monolithic member (monolithic metal plate) configures the first, second, and third planar parts  51 ,  52 , and  53 . 
     A leading edge (tip edge or forefront edge) of the second planar part  52  is a first recess-shaped part (first arc-shaped part or first arc part)  52   a  (for instance, shown in  FIG. 8A ). Specifically, the first recess-shaped part  52   a  is hollowed (recessed or depressed) toward an upper end (edge) side of the first planar part  51  and the leading edge of the first recess-shaped part  52   a  is formed to be in a planar shape (arc-planar shape). The upper edge side of the first planar part  51  is a base end side of the second planar part  52 . A recessed part  30  is formed in the upper surface  12  of the core body  10 . The second planar part  52  is arranged in the recessed part  30  of the upper surface  12 . A second recess-shaped part (second arc-shaped part or second arc part)  30   a  (for instance, shown in  FIG. 8A ) of the recessed part  30  corresponds to or is formed along the first recess-shaped part  52   a . The second recess-shaped part  30   a  is formed to be in a planar shape (arc-planar shape) along the planar shape of the first recess-shaped part  52   a.  In other words, the second recess-shaped part  30   a  of the recessed part  30  extends along a configuration (shape) of the first recess-shaped part  52   a  as shown in  FIGS. 1, 6, 8A, and 10 . 
     According to the embodiment of the present application, because the first recess-shaped part  52   a  and the second recess-shaped part  30   a  are provided, the area of a region that can be sucked (subject to a vacuum) by a suction nozzle of a mounter (not shown) can be sufficiently secured and ensured on the upper surface  12 . Note that because a suction nozzle (a suction area of the suction nozzle) is generally in a circular shape (such as “R 2 ” shown in  FIG. 8A ), the sucked region is efficiently secured on the upper surface  12  of the core body  10 . As a result, the suction of the coil component  100  by the mounter can be performed more stably. 
     The coil component  100  according to the embodiments of the present application is explained in detail below. The core body  10  is formed by a compression molding of powders including a magnetic substance material. During the process of the compression molding, the embedded part  61  of the coil  60  is embedded into the core body  10 . 
     The shape of the core body  10  is not particularly limited. However, for instance, the core body  10  has the mounting surface  11 , the upper surface  12 , and a plurality of side surfaces that are respectively orthogonal to the mounting surface  11  and the upper surface  12 . The mounting surface  11  is formed to be flat except for, for instance, a pair of second recessed parts  40  described below. The upper surface  12  is formed to be flat except for, for instance, a pair of (first) recessed parts  30 . Further, the upper surface  12  is arranged in parallel to the mounting surface  11 . 
     For instance, the side surfaces of the core body  10  has the front surface  13 , the rear surface  14 , the left side surface  15 , and the right side surface  16 . Specifically, the rear surface  14  is arranged in parallel to the front surface  13  and faces the opposite side to the front surface  13 . The left side surface  15  is orthogonal to the front surface  13  and the rear surface  14 . Further, the right side surface  16  is arranged in parallel to the left side surface  15  and faces the opposite side to the left side surface  15 . 
     The core body  10  has, for instance, the front left surface  21 , the rear left surface  22 , the rear right surface  23 , and the front right surface  24  as the side surfaces. Specifically, the front left surface  21  is arranged between the front surface  13  and the left side surface  15  and connects the front surface  13  with the left side surface  15 . The rear left surface  22  is arranged between the left side surface  15  and the rear surface  14  and connects the left side surface  15  with the rear surface  14 . The rear right surface  23  is arranged between the rear surface  14  and the right side surface  16  and connects the rear surface  14  with the right side surface  16 . Further, the front right surface  24  is arranged between the right side surface  16  and the front surface  13  and connects the right side surface  16  with the front surface  13 . The front left surface  21  is, for instance, tilted relative to each of the front surface  13  and the left side surface  15  at an angle of 135 degrees. The rear left surface  22  is, for instance, tilted relative to each of the left side surface  15  and the rear surface  14  at an angle of 135 degrees. The rear right surface  23  is, for instance, tilted relative to each of the rear surface  14  and the right side surface  16  at an angle of 135 degrees. Further, the front right surface  24  is, for instance, tilted relative to each of the right side surface  16  and the front surface  13  at an angle of 135 degrees. For instance, all of the rear left surface  22 , the rear right surface  23 , and the front right surface  24  have the same shapes and the same sizes (the same areas). However, with respect to a width dimension, the front left surface  21  is smaller than the rear left surface  22 , the rear right surface  23 , and the front right surface  24  as shown in  FIG. 8A . With respect to an area, the front left surface  21  is smaller than the rear left surface  22 , the rear right surface  23 , and the front right surface  24 . 
     Each of the front surface  13 , the rear surface  14 , the left side surface  15 , the right side surface  16 , the front left surface  21 , the rear left surface  22 , the rear right surface  23 , and the front right surface  24  is, for instance, formed to be flat. 
     In the present embodiment, a pair of left and right (first) recessed parts  30  is formed on the upper surface  12 . A pair of left and right second recessed parts  40  is formed on the mounting surface  11 . 
     As an example, the coil  60  is configured by a single round wire. In this case, the coil  60  has the embedded part  61  that is configured by winding the (single) round wire and a pair of protruding parts (the first protruding part  62  and the second protruding part  63 ) that protrude toward an outside in the radial direction from the embedded part  61 . An axis direction of the coil  60  is in the vertical direction. The first protruding part  62  is configured by one end of the (single) round wire. The second protruding part  63  is configured by the other end of the (single) round wire. The first protruding part  62  and the second protruding part  63  horizontally protrude from the embedded part  61 . For instance, the first protruding part  62  and the second protruding part  63  mutually protrude in the opposite directions from the embedded part  61 . The first protruding part  62  horizontally protrudes from, for instance, the lower part of the rear left surface  22  of the core body  10 . The second protruding part  63  horizontally protrudes from, for instance, the lower part of the front right surface  24  of the core body  10 . For instance, the protruding direction of the first protruding part  62  protruded from the rear left surface  22  is orthogonal to the rear left surface  22 . The protruding direction of the second protruding part  63  protruded from the front right surface  24  is orthogonal to the front right surface  24 . 
     Further, the coil  60  is not limited to be configured by the single round wire according to the embodiments of the present application. However, the coil  60  may be, for instance, an edgewise coil that is configured by winding a flat wire. 
     As shown in  FIG. 14 , the metal terminal  50  is, for instance, configured by a folding process of a single metal plate. 
     The metal terminal  50  has the first planar part (first plate)  51 , the second planar part (second plate)  52 , and the third planar part (third plate)  53  that are respectively formed to be a flat-shaped plate. The second planar part  52  is continuously connected to the upper end of the first planar part  51  and is substantially orthogonal to the first planar part  51 . The third planar part  53  is continuously connected to the lower end of the first planar part  51  and is substantially orthogonal to the first planar part  51 . The second planar part  52  and the third planar part  53  are located at opposite positions to each other and are substantially parallel to each other (refer to  FIG. 9 ). 
     As shown in  FIGS. 4 and 5 , the first planar part(s)  51  is, for instance, formed to be in a rectangular shape that is vertically long. 
     As shown in  FIG. 6 , the second planar part(s)  52  is, for instance, formed to be in a rectangular shape that is longer in a front-rear direction than in a right-left direction in the plan view. However, the leading edge(s) of the second planar part(s)  52  is the first recess-shaped part(s) (first arc-shaped part or first arc part)  52   a  as explained above. Further, it is preferred that a lateral width dimension (in the sight-left direction) of the second planar part(s)  52  is, for instance, more than two times of a plate thickness of the metal terminal  50 . It is also preferred that the lateral width dimension (in the sight-left direction) of the second planar part(s)  52  is, for instance, more than three times of the plate thickness of the metal terminal  50 . As a result of setting the dimensions of the second planar part  52  as explained above, the bending (folding) process of the metal terminal  50  to form the second planar part  52  can be stably performed. 
     As shown in  FIG. 7 , the third planar part(s)  53  is, for instance, formed to be in a rectangular shape that is longer in the front-rear direction than in the right-left direction in the plan view. 
     Further, as shown in  FIGS. 4, 5, and 14 , the metal terminal  50  has a fourth planar part (fourth plate)  54  and a fifth planar part (fifth plate)  55 . Specifically, the fourth planar part  54  is continuously connected to a side edge  51   a  of the first planar part  51  and joins (crosses) the first planar part  51 . The fifth planar part  55  is continuously connected to a leading edge (tip edge or forefront edge)  54   a  of the fourth planar part  54  and joins (crosses) the fourth planar part  54 . Because the fourth planar part  54  and the fifth planar part  55  are formed by the bending (folding) process of the metal terminal  50 , the side edge  51   a  and the leasing edge  54   a  are folds or ridges of the metal terminal  50 . The fourth planar part  54  and the fifth planar part  55  are also respectively formed to be a flat-shaped plate. As shown in such as  FIGS. 1-5 , each of the fourth planar part  54  and the fifth planar part  55  is, for instance, formed to be in a rectangular shape that is vertically long. 
     In the plan view, an angle between the first planar part  51  and the fourth planar part  54  is, for instance, set to be 135 degrees (refer to such as  FIG. 8A ). In the plan view, an angle between the fourth planar part  54  and the fifth planar part  55  is, for instance, set to be 90 degrees (refer to such as  FIG. 8A ). 
     The first planar part  51 , the fourth planar part  54 , and the fifth planar part  55  are respectively vertically arranged or extend in the vertical (up and down) direction. The second planar part  52  and the third planar part  53  are respectively substantially horizontally arranged or substantially extend in the horizontal direction. 
     A welded piece (welded strip)  56  is formed at a lower end part of the fifth planar part  55 . The welded piece(s)  56  is welded to the protruding part(s) (the first protruding part  62  and the second protruding part  63 ) of the coil  60  (refer to such as  FIG. 7 ). 
     In the present embodiment, the coil component  100  has a pair of left and right metal terminals (first and second metal terminals)  50 . For instance, the pair of metal terminals  50  are mutually formed to be in the same shapes and the same sizes. 
     The first planar part  51  of one (the left side) of the metal terminals  50  is arranged along the left side surface  15 . The second planar part  52  of this metal terminal  50  is arranged at or in the recessed part  30  on the left side. The third planar part  53  of this metal terminal  50  is arranged at or in the second recessed part  40  on the left side. The fourth planar part  54  of this metal terminal  50  on the left side is, for instance, arranged along the rear left surface  22 . Further, the fifth planar part  55  of this metal terminal  50  substantially vertically raises relative to (substantially uprises with respect to or substantially stands from) the rear left surface  22 . 
     The first planar part  51  of the other (the right side) of the metal terminals  50  is arranged along the right side surface  16 . The second planar part  52  of this metal terminal  50  is arranged at or in the recessed part  30  on the right side. The third planar part  53  of this metal terminal  50  is arranged at or in the second recessed part  40  on the right side. The fourth planar part  54  of this metal terminal  50  on the right side is, for instance, arranged along the front right surface  24 . Further, the fifth planar part  55  of this metal terminal  50  substantially vertically raises relative to (substantially uprises with respect to or substantially stands from) the front right surface  24 . 
     As explained above, the second recessed parts  40  at or in which the third planar parts  53  are arranged are formed on the mounting surface  11 . 
     Further, the fourth planar parts  54  are arranged along the side surfaces of the core body  10 . The fifth planar parts  55  raise relative to the side surfaces of the core body  10 . 
     Further, because the fifth planar parts  55  raise from the side surfaces of the core body  10 , the satisfactory or excellent heat dissipation from the fifth planar parts  55  can be realized. It is preferred that the vertical dimension (length) of each of the fifth planar parts  55  is half or more of the vertical dimension (length or height) of the core body  10 . It is more preferred that the vertical dimension (length) of each of the fifth planar parts  55  is two thirds or more of the vertical dimension (length or height) of the core body  10 . 
     For instance, the metal terminal  50  is adhered and fixed to the core body  10 . For instance, as shown in  FIG. 9 , the first planar part  51  is in surface contact with the side surface of the core body  10  and is surface-joined to the core body  10  by an adhesive. 
     The welded piece  56  of the metal terminal  50  on the left side is welded to one of the protruding parts (the first protruding part  62 ) of the coil  60 . Similarly, the welded piece  56  of the metal terminal  50  on the right side is welded to the other of the protruding parts (the second protruding part  63 ) of the coil  60 . 
     For instance, the welded piece  56  and the first protruding part  62  of the metal terminal  50  on the left side are mutually welded at a first welding part  71  that is in a spherical shape. Similarly, the welded piece  56  and the second protruding part  63  of the metal terminal  50  on the right side are mutually welded at a second welding part  72  that is in a spherical shape. 
     As shown in  FIGS. 11 and 12 , the recessed part  30  on the left side of the pair of left and right recessed parts  30  is arranged at the left end of the upper surface  12 . The recessed part  30  on the right side is arranged at the right end of the upper surface  12 . 
     For instance, each of the recessed parts  30  is configured with a first step  31  (a bottom surface), a first tilted (inclined) surface (wall)  32  (an upper tilted surface), a second step  35 , a second tilted surface  36 , and a pair of vertical surfaces (walls)  37 . Specifically, the first tilted surface  32  is arranged at the peripheral edge of the recessed part  30 . The second step  35  is arranged at a lower step as compared with the first step  31 . Further, the second tilted surface  36  is arranged between the first step  31  and the second step  35  and is tilted downward toward the side of the second step  35  from the side of the first step  31 . 
     The first step  31  occupies the most of the plane area of the recessed part  30 . A bottom surface of the first step  31  is substantially horizontally arranged. However, in the present embodiment, the first step  31  increases in depth as it becomes far from the side surface of the core body  10 . 
     The left edge of the first step  31  of the recessed part  30  on the left side linearly extends in the front-rear direction. Each of the front and rear edges of the first step  31  of the recessed part  30  on the left side linearly extends in the right-left direction. The second step  35  of the recessed part  30  on the left side linearly extends in the front-rear direction along the left edge of the first step  31  of the recessed part  30  on the left side, and at the same time, is substantially horizontally arranged. The left edge of the second step  35  of the recessed part  30  on the left side serves as the upper edge of the left side surface  15  at a position where the recessed part  30  on the left side is formed. 
     Similarly, the right edge of the first step  31  of the recessed part  30  on the right side linearly extends in the front-rear direction. Each of the front and rear edges of the first step  31  of the recessed part  30  on the right side linearly extends in the right-left direction. The second step  35  of the recessed part  30  on the right side linearly extends in the front-rear direction along the right edge of the first step  31  of the recessed part  30  on the right side, and at the same time, is substantially horizontally arranged. The right edge of the second step  35  of the recessed part  30  on the right side serves as the upper edge of the right side surface  16  at a position where the recessed part  30  on the right side is formed. 
     In the plan view, the second tilted surface  36  is arranged between the first step  31  and the second step  35 . 
     The second tilted surface  36  of the recessed part  30  on the left side extends in the front-rear direction along the left edge of the first step  31  of the recessed part  30  on the left side and is tilted downward toward the left side. 
     The first tilted surface  32  of the recessed part  30  on the left side is continuously arranged along the right edge, the front edge, and the rear edge of this recessed part  30 . 
     Similarly, the second tilted surface  36  of the recessed part  30  on the right side extends in the front-rear direction along the right edge of the first step  31  of the recessed part  30  on the right side and is tilted downward toward the right side. 
     Similarly, the first tilted surface  32  of the recessed part  30  on the right side is continuously arranged along the left edge, the front edge, and the rear edge of this recessed part  30 . 
     Each of the first tilted surfaces  32  is tilted to a direction in which the recessed part  30  becomes smaller (narrow) toward the depth direction (downward) of each of the recessed parts  30 . In other words, each of the first tilted surfaces  32  is tilted downward and inward with respect to the recessed part  30 . The first tilted surface  32  works as a draft angle when the core body  10  is pulled (taken out) from a mold after being formed by a molding process. 
     At each of the recessed parts  30 , the lower end of the first tilted surface  32  is positioned at the same height position as the bottom surface of the first step  31 . The vertical surfaces  37 , which are vertically arranged, are respectively arranged between both ends of the second step  35  and the second tilted surface  36  in the front-rear direction and the lower end of the first tilted surface  32 . 
     The planar shape of the recessed part  30  corresponds to the planar shape of the second planar part  52 . Each of the second planar parts  52  enters into each of the recessed parts  30 . 
     Further, as explained above, the leading edge of the second planar part  52  of the metal terminal  50  is the first recess-shaped part  52   a.  The first recess-shaped part  52   a  is hollowed (recessed or depressed) toward the upper edge side of the first planar part  51  and is formed to be in the planar shape. 
     In other words, in the plan view, a right edge (the leading edge) of the second planar part  52  of the metal terminal  50  on the left side is hollowed toward the left side. A left edge (the leading edge) of the second planar part  52  of the metal terminal  50  on the right side is hollowed toward the right side. More specifically, the right edge of the second planar part  52  of the metal terminal  50  on the left side is hollowed toward the left side in a circular arc shape (in an arc shape). The left edge of the second planar part  52  of the metal terminal  50  on the right side is hollowed toward the right side in the circular arc shape (in the arc shape). 
     Further, both ends of the leading edge of the second planar part  52  (in the present embodiment, the front and rear ends of the right edge of the second planar part  52  on the left side and the front and rear ends of the left edge of the second planar part  52  on the right side) are respectively formed to be in a projecting circular arc shape toward the outside of the second planar part  52 . 
     Further, with respect to the recessed part  30 , the portions that correspond to both ends of the leading edge of the second planar part  52  are respectively formed to be in the circular arc shape along both ends of the leading edge of the second planar part  52 . As a result, in the configuration in which the second recess-shaped part  30   a  is formed at the recessed part  30  according to the present embodiment, such as a chipping of the core body  10  can be suppressed, and at the same time, an interference of the second planar part  52  with the core body  10  can also be suppressed. 
     Further, as explained above, with respect to each of the recessed parts  30 , the portion of the recessed parts  30  that corresponds to the first recess-shaped part  52   a  is the second recess-shaped part  30   a  that is formed to be in the planar shape along the first recess-shaped part  52   a.    
     In other words, the planar shape of the right edge of the first step  31  of the recessed part  30  on the left side and the planar shape of the portion that is arranged along the right edge of the first step  31  of the first tilted surface  32  of the recessed part  30  on the left side are formed to be in the recessed shape that is hollowed toward the left side and is in a circular arc shape. 
     Similarly, the planar shape of the left edge of the first step  31  of the recessed part  30  on the right side and the planar shape of the portion that is arranged along the left edge of the first step  31  of the first tilted surface  32  of the recessed part  30  on the right side are formed to be in the recessed shape that is hollowed toward the right side and is in a circular arc shape. 
     Further, the second recess-shaped part  30   a  of the recessed part  30  on the left side and the second recess-shaped part  30   a  of the recessed part  30  on the right side are mutually arranged on the same circumference in the plan view. In other words, these (two of) second recess-shaped parts  30   a  extend along the same circumference of a circle R 1  (see  FIG. 8A ) (are concentrically arranged) on the upper surface  12  of the core body  10  in the plan view. 
     As explained above, the pair of recessed parts  30  are formed in the upper surface  12 . The coil  60  has the pair of protruding parts (the first protruding part  62  and the second protruding part  63 ). The coil component  100  has the pair of metal terminals  50 . One of the pair of metal terminals  50  is electrically connected to one of the pair of protruding parts. The other of the pair of metal terminals  50  is electrically connected to the other of the pair of protruding parts. The second planar part  52  of one of the pair of metal terminals  50  is arranged at or in one of the pair of recessed parts  30 . The second planar part  52  of the other of the pair of metal terminals  50  is arranged at or in the other of the pair of recessed parts  30 . The second recess-shaped part  30   a  of one of the pair of recessed parts  30  and the second recess-shaped part  30   a  of the other of the pair of recessed parts  30  are mutually arranged on the same circumference in the plan view. In other words, these (two of) second recess-shaped parts  30   a  extend along the same circumference of a circle R 1  (see  FIG. 8A ) (are concentrically arranged) on the upper surface  12  of the core body  10  in the plan view. 
     As a result, the circular region being surrounded by the second recess-shaped parts  30   a  of the pair of recessed parts  30  on the upper surface  12  can be excellently sucked by a suction nozzle of a mounter. 
     Specifically, as shown in  FIG. 8A , the circular region being surrounded by two second recess-shaped parts  30   a  corresponds to the circle R 1 . Further, a circle R 2  corresponds to, for example, a periphery of the suction nozzle of the mounter or the sucked region. 
     As shown in  FIG. 13 , the second recessed part  40  on the left side of a pair of left and right second recessed parts  40  is arranged at the left end of the mounting surface  11 . The second recessed part  40  on the right side is arranged at the right end of the mounting surface  11 . 
     For instance, each of the second recessed parts  40  is configured with a first step  41  (a bottom surface), a first tilted surface (wall)  42  (a lower tilted surface), a pair of front and rear second tilted surfaces (walls)  43  (lower tilted surfaces), a second step  45 , a third tilted surface  46 , and a pair of vertical surfaces (walls)  47 . Specifically, the first tilted surface  42  and the pair of front and rear second tilted surfaces  43  are arranged at a peripheral edge of second recessed part  40 . The second step  45  is arranged in the upward position (on the side of the upper surface  12 ) as compared with the first step  41 . Further, the third tilted surface  46  is arranged between the first step  41  and the second step  45  and is tilted (tilted upward) toward the side of the second step  45  from the side of the first step  41 . 
     The first step  41  occupies the most of the plane area of the second recessed part  40 . A bottom surface of the first step  41  is substantially horizontally arranged. But, in the present embodiment, the first step  41  increases in depth as it becomes far from the side surface of the core body  10 . However, the bottom surface of the first step  41  is not limited to the above configuration and may be arranged horizontally (to be parallel to the mounting surface  11 ). 
     Each of the left and right edges of the first step  41  of the second recessed part  40  on the left side linearly extends in the front-rear direction. Each of the front and rear edges of the first step  41  of the second recessed part  40  on the left side linearly extends in the right-left direction. The second step  45  of the second recessed part  40  on the left side linearly extends in the front-rear direction along the left edge of the first step  41  of the second recessed part  40  on the left side, and at the same time, is substantially horizontally arranged. The left edge of the second step  45  of the second recessed part  40  on the left side serves as the lower edge of the left side surface  15  at a position where the second recessed part  40  on the left side is formed. 
     Similarly, each of the left and right edges of the first step  41  of the second recessed part  40  on the right side linearly extends in the front-rear direction. Each of the front and rear edges of the first step  41  of the second recessed part  40  on the right side linearly extends in the right-left direction. The second step  45  of the second recessed part  40  on the right side linearly extends in the front-rear direction along the right edge of the first step  41  of the second recessed part  40  on the right side, and at the same time, is substantially horizontally arranged. The right edge of the second step  45  of the second recessed part  40  on the right side serves as the lower edge of the right side surface  16  at a position where the second recessed part  40  on the right side is formed. 
     In the plan view, the third tilted surface  46  is arranged between the first step  41  and the second step  45 . 
     The third tilted surface  46  of the second recessed part  40  on the left side extends in the front-rear direction along the left edge of the first step  41  of the second recessed part  40  on the left side and is tilted upward toward the left side. The first tilted surface  42  of the second recessed part  40  on the left side extends in the front-rear direction along the right edge of this second recessed part  40 . The second tilted surface  43  at the front side of the second recessed part  40  on the left side extends in the right-left direction along the front edge of the second recessed part  40  on the left side. The second tilted surface  43  at the rear side of the second recessed part  40  on the left side extends in the right-left direction along the rear edge of the second recessed part  40  on the left side. 
     Similarly, the third tilted surface  46  of the second recessed part  40  on the right side extends in the front-rear direction along the right edge of the first step  41  of the second recessed part  40  on the right side and is tilted upward toward the right side. The first tilted surface  42  of the second recessed part  40  on the right side extends in the front-rear direction along the left edge of this second recessed part  40 . The second tilted surface  43  at the front side of the second recessed part  40  on the right side extends in the right-left direction along the front edge of the second recessed part  40  on the right side. The second tilted surface  43  at the rear side of the second recessed part  40  on the right side extends in the right-left direction along the rear edge of the second recessed part  40  on the right side. 
     With respect to each of the second recessed parts  40 , the first tilted surface  42  and the pair of second tilted surfaces  43  are tilted to a direction in which the second recessed part  40  becomes smaller toward the depth direction (upward) of each of the second recessed parts  40 . The first tilted surface  42  and the pair of second tilted surfaces  43  work as draft angles when the core body  10  is pulled (taken out) from a mold after being formed by s molding process. 
     At each of the second recessed parts  40 , the upper end of each of the second tilted surfaces  43  is positioned at the same height position as the bottom surface of the first step  41 . The vertical surfaces  47 , which are vertically arranged, are respectively arranged between both ends of the second step  45  and the third tilted surface  46  in the front-rear direction and the upper ends of the second tilted surfaces  43 . 
     The planar shape of the second recessed part  40  corresponds to the planar shape of the third planar part  53 . Each of the third planar parts  53  enters into each of the second recessed parts  40 . 
     As shown in  FIG. 9 , for instance, the second planar part  52  is spaced apart from the bottom surface of the recessed part  30 . On the other hand, the third planar part  53  comes in contact with the bottom surface of the second recessed part  40 , or alternatively, a distance between the third planar part  53  and the bottom surface of the second recessed part  40  is smaller than a distance between the second planar part  52  and the bottom surface of the recessed part  30 . 
     As a result, since the third planar parts  53  work as mounting terminals, a position accuracy of the third planar parts  53  can be improved. In addition, as mentioned above, the interferences between the second planar parts  52  and the recessed parts  30  (the core body  10 ) can be suppressed. 
     When the metal terminal(s)  50  is attached on (is assembled to) the core body  10 , for instance, the second planar part  52  is joined (caulked) by being pressed downward. The second step  35  and the second tilted surface  36  are respectively arranged at the boundary part between the upper surface  12  and the left side surface  15  and at the boundary part between the upper surface  12  and the right side surface  16 . Therefore, when the metal terminal  50  is attached on (is assembled to) the core body  10  and the second planar part  52  is joined (caulked) (by being pressed downward), the interferences between the second planar parts  52  and the core body  10  can be suppressed. Further, as explained above, the first step  31  increases in depth as it becomes far from the side surface. Therefore, after the second planar part  52  is joined (caulked) to the core body  10 , it is possible to suppress a case in which the second planar part  52  is detached from the recessed part  30  toward the outside. That is, it is possible to respectively suppress cases in which the second planar part  52  on the left side is detached from the recessed part  30  on the left side in the left direction and the second planar part  52  on the right side is detached from the recessed part  30  on the right side in the right direction. 
     Further, the second step  45  and the third tilted surface  46  are respectively arranged at the boundary part between the mounting surface  11  and the left side surface  15  and at the boundary part between the mounting surface  11  and the right side surface  16 . Therefore, when the metal terminal(s)  50  is attached on (is assembled to) the core body  10 , the interferences between the third planar parts  53  and the core body  10  can be suppressed. 
     As explained above, the first tilted surface  32  of the recessed part  30  is tilted to the direction in which the recessed part  30  becomes smaller toward the depth direction (downward) of the recessed part  30 . Similarly, the first tilted surface  42  and the pair of second tilted surfaces  43  of the second recessed part  40  are tilted to the direction in which the second recessed part  40  becomes smaller toward the depth direction (upward) of the second recessed part  40 . 
     However, in the present embodiment, the tilt angle of the first tilted surface  32  is steeper (more acute) (closer to 90 degrees) than the tilt angle of each of the first tilted surface  42  and the second tilted surfaces  43 . 
     As explained above, the upper tilted surface (the first tilted surface  32 ), which is tilted to the direction in which the recessed part  30  becomes smaller toward the depth direction of the recessed part  30 , is formed on the peripheral edge of the recessed part  30 . The lower tilted surfaces (the first tilted surface  42  and the second tilted surfaces  43 ), which are tilted to the direction in which the second recessed part  40  becomes smaller toward the depth direction of the second recessed part  40 , are formed on the peripheral edge of the second recessed part  40 . The tilt angle of the upper tilted surface is steeper (more acute) than the tilt angle of each of the lower tilted surfaces. 
     As a result, the area of the sucked region that can be sucked by a suction nozzle of a mounter can be secured more sufficiently on the upper surface  12  of the core body  10 . 
     As shown in  FIG. 4 , a width dimension W 1  (for instance, a width dimension in the front-rear direction) of the upper end of the first planar part  51  is smaller than a width dimension W 2  (for instance, a width dimension in the front-rear direction) of the lower end of the first planar part  51 . Therefore, the joining process (attaching process) (caulking process) of the second planar part  52  can be performed easily. 
     Further, the dimension of the second planar part  52  is smaller than the dimension of the third planar part  53  in the radial direction of the coil component  100 . Therefore, the area of the sucked region that can be sucked by the suction nozzle of the mounter can be secured more sufficiently on the upper surface  12  of the core body  10 . 
     Further, the first protruding part  62  and the second protruding part  63  of the coil  60  protrude from the lower part of the core body  10 . The first protruding part  62  and the second protruding part  63  are respectively electrically connected to each of the metal terminals  50  at the lower part of the coil component  100 . Therefore, the distance between each of the first protruding part  62  and the second protruding part  63  and each of the third planar parts  53 , which are mounting terminals, can be shorten. As a result, a direct current resistance (DCR) of the coil component  100  is decreased. 
     In addition, the first protruding part  62 , the second protruding part  63 , the first welding part  71 , and the second welding part  72  are arranged at the lower part of the coil component  100 . Therefore, since a position of a center of gravity of the coil component  100  can be more lowered, a vibration resistance of the coil component  100  can be improved. 
     Further, applications or uses of the coil component  100  are not particularly limited. However, for instance, the coil component  100  according to the embodiments of the present application can be used as an inductor assembled in a vehicle. 
     The embodiments of the coil component are explained with reference to the drawings. However, these embodiments are examples of the present invention. Thus, it will be apparent that the same may be varied in many ways. 
     The embodiments of the present application include the following technical ideas or technical concepts. 
     &lt;1&gt; A coil component including: 
     a core body formed of a magnetic material, the core body having: 
     a mounting surface; 
     an upper surface, the upper surface and the mounting surface being outwardly opposite to each other; and 
     a first side surface joining the mounting surface and the upper surface; 
     a coil having: 
     an embedded part embedded in the core body; and 
     a first protruding part protruding from the core body; and 
     a first metal terminal electrically connected to the first protruding part of the coil, the first metal terminal having: 
     a first plate arranged along the first side surface of the core body; 
     a second plate continuously extending from an upper end of the first plate and arranged along the upper surface of the core body; and 
     a third plate continuously extending from a lower end of the first plate and arranged along the mounting surface of the core body, 
     wherein a leading edge of the second plate is recessed toward the upper end of the first plate to form a first arc-shaped part, 
     the upper surface of the core body has a first recess in which the second plate is arranged, and 
     the first recess has a second arc-shaped part at a portion facing the first arc-shaped part, and the second arc-shaped part extends along a contour of the first arc-shaped part. 
     &lt;2&gt; The coil component according to &lt;1&gt;, further including: 
     a second metal terminal having: 
     a fourth plate arranged along a second side surface of the core body; 
     a fifth plate continuously extending from an upper end of the fourth plate and arranged along the upper surface of the core body; and 
     a sixth plate continuously extending from a lower end of the fourth plate and arranged along the mounting surface of the core body, 
     wherein the second side surface of the core body joins the mounting surface and the upper surface, 
     the coil has a second protruding part protruding from the core body, and the second metal terminal is electrically connected to the second protruding part, 
     the upper surface of the core body has a second recess in which the fifth plate is arranged, 
     a leading edge of the fifth plate is recessed toward the upper end of the fourth plate to form a third arc-shaped part, 
     the second recess has a fourth arc-shaped part at a portion facing the third arc-shaped part, and the fourth arc-shaped part extends along a contour of the third arc-shaped part, and 
     the second arc-shaped part of the first recess and the fourth arc-shaped part of the second recess extend along a same circumference of a circle (are concentrically arranged) on the upper surface of the core body in a plan view. 
     &lt;3&gt; The coil component according to &lt;1&gt; or &lt;2&gt;, 
     wherein the mounting surface has a third recess in which the third plate of the first metal terminal is arranged. 
     &lt;4&gt;The coil component according to &lt;3&gt;, 
     wherein the second plate of the first metal terminal is spaced apart from a bottom of the first recess via a first distance, 
     the third plate of the first metal terminal contacts a bottom of the third recess or is spaced apart from the bottom of the third recess via a second distance, and the second distance is smaller than the first distance. 
     &lt;5&gt; The coil component according to &lt;3&gt; or &lt;4&gt;, 
     wherein a first inner wall of the first recess is inwardly inclined by a first angle, and an area of a bottom of the first recess is smaller than an area of a top of the first recess, 
     a second inner wall of the third recess is inwardly inclined by a second angle, and area of a bottom of the third recess is smaller than an area of a top of the third recess, and 
     the first angle is more acute than the second angle. 
     &lt;6&gt; The coil component according to any one of &lt;1&gt;-&lt;5&gt;, 
     wherein the first metal terminal further has: 
     a seventh plate continuously extending at an angle from a side edge of the first plate; and 
     an eighth plate continuously extending at an angle from a leading edge of the seventh plate, 
     the seventh plate extends along another side surface of the core body, and 
     the eighth plate uprises with respect to the another side surface. 
     &lt;7&gt; The coil component according to &lt;6&gt;, further including: 
     a welded piece provided at a lower end part of the eighth plate of the first metal terminal, 
     wherein the welded piece is welded to the first protruding part of the coil. 
     The coil component being thus described, it will be apparent that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be apparent to one of ordinary skill in the art are intended to be included within the scope of the following claims. Further, the above embodiments can be combined with each other and such combinations are not to be regarded as a departure from the spirit and scope of the invention.