Patent Publication Number: US-11398339-B2

Title: Surface mounting coil device and electronic equipment

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a surface mounting coil device used after being mounted on a circuit substrate or the like and electronic equipment in which a surface mounting coil is mounted. 
     2. Description of the Related Art 
     A technique for attaching a shield member for suppressing magnetic flux leakage to the periphery of a coil device to the coil device has been proposed with regard to coil devices used for electronic equipment and the like. It is preferable that the shield member is electrically connected with respect to an earth (ground wiring) of the electronic equipment or a substrate. In addition, in some cases, shield member-based magnetic flux leakage suppression is required with regard to coil devices for surface mounting as well. 
     SUMMARY OF THE INVENTION 
     However, the shield member according to the related art, which is attached to a substrate separately from the coil device, causes production efficiency-related problems because the two components need to be mounted. In addition, the following problems arise during shield member connection to an earth or the like in a case where a method for integrating the shield member in the coil device before mounting is adopted, particularly in the case of application to a coil device to be surface-mounted. 
     In other words, in a case where a technique for connecting the shield member with respect to an earth terminal in the coil device before mounting is adopted, the earth terminal and the shield member need to be wired in a coil device manufacturing process. Accordingly, such shield member-equipped coil devices are problematic in terms of production efficiency and cost. 
     Also conceivable regarding coil device manufacturing processes is a technique for not connecting the shield member to the earth terminal in the coil device by means of simple shield member-coil device integration. Conceivable for adopting such a technique and earthing the shield member is the shield member being directly wired onto a mounting substrate with the shield member given a portion for installation onto the mounting substrate. However, for the direct shield member wiring onto the mounting substrate, the shield member and the coil device need to be integrated with both the installation portion of the shield member and the terminal of the coil device aligned so as to reach an appropriate height with respect to the mounting substrate. 
     In such a coil device, no sufficient assembly tolerance can be ensured with ease when both the height of the installation portion of the shield member and the height of the terminal of the coil device are attempted to be kept within an allowable error range. In addition, once the positional accuracy between the installation portion of the shield member and the terminal of the coil device becomes insufficient, problems may arise in the form of, for example, the installation portion or the terminal floating from the mounting substrate to result in a mounting failure. In addition, in a case where a technique for simultaneously wiring the installation portion of the shield member and the terminal of the coil component on the mounting substrate is adopted, connection to many land patterns needs to be performed, and thus a connection failure attributable to contact floating or the like may become more likely as, for example, the preliminary solder that is formed in each land pattern is not uniform. 
     The invention has been made in view of such circumstances and provides a surface mounting coil device capable of preventing a connection failure during mounting and satisfactory in terms of productivity and electronic equipment including such a surface mounting coil device. 
     In order to achieve the above object, a surface mounting coil device according to the invention includes a bobbin including a hollow tube-shaped hollow tube portion and a terminal block portion connected to the hollow tube portion and provided with terminals installed on a mounting substrate after mounting, a wire member including a winding portion wound around the hollow tube portion, both ends of the wire member being electrically connected to the terminals respectively, a core including a middle leg portion passing through the hollow tube portion and attached to the bobbin, and a shield member including a shielding portion positioned in an outer diameter direction of the winding portion, an engagement portion engaged so as to be relatively movable along a mounting direction with respect to the bobbin, and an installation portion connected directly or via the shielding portion with respect to the engagement portion and installed on the mounting substrate after mounting. 
     In the surface mounting coil device according to the invention, the engagement portion of the shield member is engaged so as to be relatively movable along the mounting direction with respect to the bobbin. Accordingly, when the coil device is installed on the mounting substrate, both the installation portion of the shield member and the terminal of the bobbin can be disposed at an appropriate height with respect to each land pattern of the mounting substrate. Accordingly, the surface mounting coil device is capable of preventing the problem of the installation portion or the terminal of the coil device floating from the land pattern of the mounting substrate when the surface mounting coil device is installed on the mounting substrate and effectively preventing a connection failure of the coil device. 
     In addition, the height of the installation portion of the shield member and the height of the terminal of the coil device do not have to coincide with each other during manufacturing of the surface mounting coil device, and thus a sufficient assembly tolerance can be easily ensured and productivity is ensured to a satisfactory extent with the surface mounting coil device. In addition, no wiring needs to be performed on the shield member and the terminal, and thus the productivity of the surface mounting coil device is excellent in this regard as well. 
     For example, the shielding portion may include a top plate portion positioned above the winding portion, which is one side in the mounting direction, and first and second side plate portions respectively connected to both ends of the top plate portion and extending downward, which is the other side in the mounting direction, from the top plate portion. 
     The installation portion may include first and second installation portions respectively connected to lower ends of the first and second side plate portions. 
     By the shielding portion having the top plate portion and the first and second side plate portions, the shielding portion is capable of surrounding the winding portion from three directions. Accordingly, the surface mounting coil device is capable of more effectively preventing magnetic flux leakage. In addition, a mounting machine is capable of mounting the surface mounting coil device by adsorbing the top plate portion, and thus the surface mounting coil device is easily transported by the mounting machine. 
     For example, the top plate portion may be rectangular and tabular and the first and second side plate portions may be respectively connected to a pair of opposite sides of the top plate portion. 
     The engagement portion may include first and second engagement portions respectively connected to the other pair of opposite sides of the top plate portion. 
     In the surface mounting coil component, the first and second engagement portions are capable of sandwiching the bobbin from both sides, and thus the bobbin and the shield member can be more reliably engaged. In addition, the first and second engagement portions and the first and second side plate portions are connected independently with respect to the top plate portion, and thus a variation in the length from the top plate portion to the installation portion (total length of the shield member in the mounting direction) can be suppressed by the shapes of the first and second side plate portions and the installation portion being simplified. As a result, a shape variation after mounting can be suppressed. 
     For example, the core may include a first core part and a second core part separate from each other. 
     The surface mounting coil device according to the invention may further include a tape wound around an outer periphery of the core and fixing the first core part and the second core part to each other. 
     The coil device that has the tape and the core can be assembled with ease, and thus the amount of magnetic flux leakage can be adjusted with ease. 
     Electronic equipment according to the invention includes a mounting substrate including a pair of land patterns, a conductor portion interconnecting the pair of land patterns, and the other land pattern different from the pair of land patterns, a bobbin including a hollow tube-shaped hollow tube portion and a terminal block portion connected to the hollow tube portion and provided with terminals installed in the other land pattern of the mounting substrate, a wire member including a winding portion wound around the hollow tube portion, both ends of the wire member being electrically connected to the terminals respectively, a core including a middle leg portion passing through the hollow tube portion and attached to the bobbin, and a shield member including a shielding portion having a top plate portion positioned above the winding portion, which is one side in the mounting direction, an engagement portion engaged so as to be relatively movable along the mounting direction with respect to the bobbin, and a pair of installation portions connected directly or via the shielding portion with respect to the engagement portion and installed in the pair of land patterns of the mounting substrate, in which the top plate portion and the conductor portion are disposed so as to sandwich the winding portion from both sides of the mounting direction. 
     The electronic equipment has the engagement portion engaged so as to be relatively movable with respect to the bobbin, and thus both the terminal and the installation portion come into contact with and are mounted in the land pattern of the mounting substrate in an appropriate manner. In addition, since the installation portion is appropriately installed with respect to the land pattern, the problem of the shield member floating from the mounting substrate can be appropriately prevented even in a case where the periphery of the bobbin, the core, or the like is filled with a potting resin. In addition, since the top plate portion of the shield member and the conductor portion of the mounting substrate are disposed so as to sandwich the winding portion of the wire member from both sides in the mounting direction, leakage magnetic flux generation to both mounting direction sides can be prevented in a particularly effective manner. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic perspective view of a surface mounting coil device according to an embodiment of the invention; 
         FIG. 2  is an exploded perspective view of the surface mounting coil device illustrated in  FIG. 1 ; 
         FIG. 3  is a schematic cross-sectional view of the coil device illustrated in  FIG. 1 ; 
         FIGS. 4A and 4B  are conceptual diagrams illustrating a process for mounting the surface mounting coil device illustrated in  FIG. 1 ; 
         FIG. 5  is a circuit diagram of the surface mounting coil device illustrated in  FIG. 1 ; 
         FIG. 6  is a conceptual diagram illustrating a land pattern of a mounting substrate for mounting the surface mounting coil device illustrated in  FIG. 1 ; and 
         FIG. 7  is a schematic cross-sectional view of electronic equipment according to the embodiment of the invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Hereinafter, the invention will be described based on an embodiment illustrated in the drawings. 
     A transformer  10  as a surface mounting coil device according to the present embodiment illustrated in  FIG. 1  is used after being mounted on a mounting substrate included in, for example, electronic equipment for household or industrial use or in-vehicle electronic equipment mounted in a vehicle such as an electric vehicle (EV: electric transport equipment). The transformer  10  can be surface-mounted with respect to the mounting substrate by a mounting machine adsorbing and transporting the upper surface (a top plate portion  63 ) of the transformer  10 . Alternatively, the transformer  10  may be used after being mounted on the substrate by a method other than surface mounting. 
     The transformer  10  has a wire member  40  having, for example, a conducting wire through which a current flows, a bobbin  20  around which the wire member  40  is wound, a core  50 , a shield member  60 , and a tape  90 . As illustrated in  FIG. 2 , which is an exploded perspective view of the transformer  10 , the transformer  10  is manufactured by the wire member  40  (see  FIGS. 1 and 3 ), the core  50 , the tape  90 , and the shield member  60  being combined with respect to the bobbin  20 . The wire member  40  is not illustrated in  FIG. 2 . 
     As illustrated in  FIG. 4B , in the transformer  10 , the lower ends of terminals  33  and  36  and the lower end of an installation portion  70  (second installation portion  73 ) in the shield member  60  are installed in land patterns  83 ,  86 , and  88  (see  FIG. 6 ) provided on a mounting surface  80   c  of a mounting substrate  80 . As illustrated in  FIGS. 1 to 4A and 4B , in the description of the transformer  10 , the Z axis direction is the mounting direction that coincides with the normal direction of the mounting surface, the Y axis direction is the winding axis direction of the wire member illustrated in  FIG. 1  and is perpendicular to the mounting direction, and the X axis direction is perpendicular to the Z axis direction and the Y axis direction. 
     As illustrated in  FIG. 2 , the bobbin  20  included in the transformer  10  has a hollow tube-shaped hollow tube portion  22 , a terminal block portion  24  connected to the hollow tube portion  22  and provided with a terminal  31 , a terminal  32 , and the terminal  33 , a terminal block portion  25  provided with a terminal  34 , a terminal  35 , and the terminal  36 , and flange portions  26  and  27 . The hollow tube portion  22  has a substantially quadratic pole-shaped outer shape extending in parallel to the mounting surface  80   c  along the Y axis direction. Connected to both ends of the hollow tube portion  22  are the flange portions  26  and  27  protruding in the Z axis positive direction and the X axis direction from the hollow tube portion  22  and the terminal block portions  24  and  25  protruding in the Z axis negative direction from the hollow tube portion  22 . 
     As illustrated in  FIG. 2 , the terminal block portion  24  of the bobbin  20  is connected to the lower part of the hollow tube portion  22  that is on the Y axis negative direction side. The terminals  31 ,  32 , and  33  provided in the terminal block portion  24  have a substantially U shape with both end portions facing the Y axis negative direction side. The terminals  31 ,  32 , and  33  are insert-molded in the terminal block portion  24  of the bobbin  20  with both end portions exposed from the terminal block portion  24 . As illustrated in  FIG. 1 , wire end portions  44   a,    44   b,  and  44   c,  which are both ends of the wire member  40 , are connected to the upper end portions of the terminals  31 ,  32 , and  33 , respectively. As illustrated in  FIGS. 4A and 4B , the lower end portions of the terminals  31 ,  32 , and  33  are installed on the mounting substrate  80  during mounting and connected to a land pattern  81 , a land pattern  82 , and the land pattern  83  illustrated in  FIG. 6 , respectively. 
     As illustrated in  FIG. 3 , the terminal block portion  25  of the bobbin  20  is connected to the lower part of the hollow tube portion  22  that is on the Y axis positive direction side. The terminals  34 ,  35 , and  36  provided in the terminal block portion  25  have a substantially U shape with both end portions facing the Y axis positive direction side. Similarly to the terminals  31 ,  32 , and  33 , the terminals  34 ,  35 , and  36  are insert-molded in the terminal block portion  25  of the bobbin  20  with both end portions exposed from the terminal block portion  25 . Wire end portions  44   d  and  44   f  (see  FIG. 5 ), which are both ends of the wire member  40 , are connected to the upper end portions of the terminals  34  and  36 , respectively. The lower end portions of the terminals  34  and  36  are installed on the mounting substrate  80  during mounting and connected to a land pattern  84  and the land pattern  86  illustrated in  FIG. 6 , respectively. 
     The terminal block portion  24  provided with the terminals  31 ,  32 , and  33  and the terminal block portion  25  provided with the terminals  34 ,  35 , and  36  have symmetrical shapes as illustrated in  FIGS. 4A and 4B , and the bobbin  20  illustrated in  FIG. 2  has a bilaterally symmetrical shape with respect to the center position of the hollow tube portion  22 . Alternatively, the bobbin  20  may have an asymmetrical shape. 
     As illustrated in  FIG. 2 , an engagement receiving portion  28  is formed in the flange portion  26  connected to the Y axis negative direction side of the hollow tube portion  22 . The engagement receiving portion  28  and an engagement receiving portion  29  are the parts of the flange portion  26  that protrude in the Z axis positive direction from the hollow tube portion  22  and are formed on the outside surface of the flange portion  26  (surface on the Y axis negative direction side). As illustrated in  FIGS. 1 and 2 , the engagement receiving portions  28  and  29  are constituted by two projections protruding to the Y axis negative direction side and engaged with two engagement holes  68   a  and  68   b  formed in a first engagement portion  68  of the shield member  60 . 
     Although not illustrated in  FIG. 2 , the flange portion  27  connected to the Y axis positive direction side of the hollow tube portion  22  has a shape substantially symmetrical to the flange portion  26  and an engagement receiving portion (not illustrated) having a shape symmetrical to the engagement receiving portions  28  and  29  of the flange portion  26  formed in the flange portion  27 . Two engagement holes (not illustrated) formed in a second engagement portion  69  of the shield member  60  are engaged with the engagement receiving portion of the flange portion  26 . 
     The wire member  40  illustrated in  FIG. 1  has a winding portion  42  wound around the outer periphery of the hollow tube portion  22  of the bobbin  20  illustrated in  FIG. 2 . As illustrated in  FIG. 1 , both ends of the wire member  40  are drawn out from the winding portion  42  and electrically connected with respect to the terminals  31  to  36  of the bobbin  20 . The wire member  40  may be constituted by a single wire or a stranded wire such as a litz wire. Although the wire diameter of the wire that constitutes the wire member  40  is not particularly limited, it is preferable that the wire diameter ranges from 1.0 to 4.0 mm. The wire member  40  is constituted by a conductive wire such as a metal wire or an insulated wire in which a conductive wire is insulated. 
       FIG. 5  is a circuit diagram of the transformer  10  illustrated in  FIG. 1 . The wire member  40  is constituted by three wires with the respective end portions of the wires connected to the terminals  31 ,  32 ,  33 ,  34 , and  36 . Of the terminals  31  to  36  of the bobbin  20 , one wire is connected to the terminals  31 ,  33 ,  34 , and  36 , two wires are connected to the terminal  32 , and no wire is connected to the terminal  35 . The number of terminals provided in the bobbin  20 , the number of wires wound around the hollow tube portion  22 , and the position of wire connection to each of the terminals  31  to  35  can be appropriately changed. 
     The core  50  is attached to the bobbin  20  as illustrated in  FIGS. 1 and 2 . As illustrated in  FIG. 2 , the core  50  has a first core part  50   a  and a second core part  50   b,  which are separate from each other. Each of the first core part  50   a  and the second core part  50   b  has a substantially E shape when viewed from the mounting direction and has a substantially symmetrical shape. The first core part  50   a  and the second core part  50   b  constitute the core  50  by being combined such that a middle leg portion  52  joined at the center in the X axis direction is inserted through the hollow tube portion  22  of the bobbin  20 . The first core part  50   a  and the second core part  50   b  are fixed to each other by the tape  90  wound around the outer periphery of the core  50 . A gap material may be provided at the butt part between the first core part  50   a  and the second core part  50   b.    
     As illustrated in  FIGS. 1 and 2 , the core  50  has the middle leg portion  52  passing through the hollow tube portion  22 , side leg portions  54  and  55  disposed on both sides of the middle leg portion  52  in the X axis direction so as to sandwich the middle leg portion  52 , and connecting portions  56  and  57  connecting the respective X axis direction end portions of the middle leg portion  52  and the side leg portions  54  and  55 . As illustrated in  FIG. 3 , the side leg portion  54  is installed on the upper surface of the terminal block portion  24  on the X axis negative direction side, the side leg portion  55  is installed on the upper surface of the terminal block portion  25  on the X axis positive direction side, and the side leg portions  54  and  55  and the middle leg portion  52  are arranged along the X axis direction. 
     As illustrated in  FIGS. 1 to 3 , in the core  50 , the side leg portions  54  and  55  and the connecting portions  56  and  57  connect both ends of the middle leg portion  52  passing through the hollow tube portion  22  where the winding portion  42  is formed outside the winding portion  42  and the hollow tube portion  22  and form a magnetic circuit with regard to the magnetic flux that is generated by the current flowing through the wire member  40 . The middle leg portion  52  and the side leg portions  54  and  55  extend in the Y axis direction, which is the winding axis direction of the winding portion  42 , and are disposed substantially in parallel to each other. Although examples of the material of the core  50  include a soft magnetic material such as metal and ferrite, the material is not particularly limited. 
     As illustrated in  FIG. 1 , the shield member  60  is attached from above with respect to the bobbin  20  and has a shielding portion  62 , an engagement portion  66 , and the installation portion  70 . The shielding portion  62  is positioned in the outer diameter direction of the winding portion  42  and prevents the magnetic flux generated by the current flowing through the wire member  40  from leaking to the outside of the transformer  10 . The shielding portion  62  has the top plate portion  63  positioned above the winding portion  42  (positioned on the Z axis positive direction side), which is one side in the mounting direction, a first side plate portion  64  positioned on the X axis negative direction side with respect to the winding portion  42 , and a second side plate portion  65  positioned on the X axis positive direction side with respect to the winding portion  42 . All of the top plate portion  63 , the first side plate portion  64 , and the second side plate portion  65  are tabular except for the mutually connected parts of the top plate portion  63 , the first side plate portion  64 , and the second side plate portion  65 . 
     As illustrated in  FIG. 1 , the top plate portion  63  constitutes the upper surface of the transformer  10 . The first side plate portion  64  and the second side plate portion  65  are connected to both X axis direction end portions of the top plate portion  63  and extend downward (in the Z axis negative direction), which is the other side in the mounting direction, from the top plate portion  63 . As illustrated in  FIG. 2 , the top plate portion  63  is substantially rectangular and tabular and the first and second side plate portions  64  and  65  are respectively connected to a pair of opposite sides  63   a  and  63   b,  which are on both sides of the top plate portion  63  in the X axis direction. 
     As illustrated in  FIG. 2 , the installation portion  70  in the shield member  60  has a first installation portion  72  connected to the lower end of the first side plate portion  64  (end portion on the Z axis negative direction side) and the second installation portion  73  connected to the lower end of the second side plate portion  65 . The first and second installation portions  72  and  73  are connected via the shielding portion  62  with respect to the engagement portion  66  (described later). 
     The installation portion  70  constituted by the first and second installation portions  72  and  73  is positioned at the lowest part in the shield member  60  (on the Z axis negative direction side). As illustrated in  FIGS. 4A and 4B , the installation portion  70  constituted by the first and second installation portions  72  and  73  is installed on the mounting substrate  80  during mounting. As illustrated in  FIG. 3 , the first and second installation portions  72  and  73  protrude outward from the lower ends of the first and second side plate portions  64  and  65  such that the tips of the first and second installation portions  72  and  73  are separated from the center of the transformer  10 . 
     Alternatively to the shapes that are illustrated in  FIG. 3 , the first and second installation portions  72  and  73  may protrude inward from the lower ends of the first and second side plate portions  64  and  65  such that the tips of the first and second installation portions  72  and  73  approach the center of the transformer  10 . Although the first and second installation portions  72  and  73  extend in the horizontal direction (XY plane direction), the shapes of the first and second installation portions  72  and  73  are not limited thereto. The first and second installation portions  72  and  73  may have any other shapes allowing the first and second installation portions  72  and  73  to be installed on the mounting substrate  80 . The shapes include a shape extending obliquely downward and a bent shape. 
     As illustrated in  FIG. 3 , a Z axis direction length L 1  from the lower surface of the top plate portion  63  to the lower ends of the first and second installation portions  72  and  73  is longer than a length L 2  from the upper surfaces of the flange portions  26  and  27 , which are the upper end of the bobbin  20 , to the terminals  34 ,  35 , and  36 . Accordingly, by the mounting machine pushing the top plate portion  63  from above as illustrated in  FIG. 4B , the first and second installation portions  72  and  73  are capable of coming into contact with the mounting surface  80   c  of the mounting substrate  80 . 
     As illustrated in  FIG. 2 , the engagement portion  66  in the shield member  60  has the first engagement portion  68  and the second engagement portion  69 . The first and second engagement portions  68  and  69  are connected to the other pair of opposite sides  63   c  and  63   d  in the top plate portion  63  (opposite sides on both Y axis direction sides), respectively. As illustrated in  FIG. 1 , the first and second engagement portions  68  and  69  are disposed so as to sandwich the vicinity of the upper end portion of the bobbin  20  from both Y axis direction sides, the first engagement portion  68  faces the flange portion  26  (see  FIG. 2 ) of the bobbin  20 , and the second engagement portion  69  faces the flange portion  27  of the bobbin  20 . 
     As illustrated in  FIG. 1 , the engagement holes  68   a  and  68   b  engaged with the engagement receiving portions  28  and  29  formed in the flange portion  26  are formed in the first engagement portion  68 . In the transformer  10 , the engagement receiving portions  28  and  29  as projections are engaged with respect to the engagement holes  68   a  and  68   b  as through holes. As illustrated in  FIG. 2 , the second engagement portion  69  has a shape substantially symmetrical to the first engagement portion  68 . Similarly to the first engagement portion  68 , the second engagement portion  69  has an engagement hole engaged with the engagement receiving portion that is formed in the flange portion  27 . 
     The engagement portion  66  constituted by the first and second engagement portions  68  and  69  is engaged so as to be relatively movable along the Z axis direction, which is the mounting direction, with respect to the bobbin  20 . In other words, the Z axis direction opening length of the engagement holes  68   a  and  68   b  illustrated in  FIG. 1  is longer than the Z axis direction length of the engagement receiving portions  28  and  29 , and the engagement receiving portions  28  and  29  are capable of moving in the Z axis direction in the engagement holes  68   a  and  68   b.  The Y axis direction gap that is formed between the first engagement portion  68  and the second engagement portion  69  is substantially equal to the Y axis direction width of the flange portion  26  and the flange portion  27  except for the engagement receiving portions  28  and  29 . Accordingly, the first and second engagement portions  68  and  69  do not elastically grip the bobbin  20  or the first and second engagement portions  68  and  69  grip the bobbin  20  with a weak force, to such an extent that the bobbin  20  is capable of sliding by the weight of the bobbin  20 , in a case where the first and second engagement portions  68  and  69  grip the bobbin  20 . 
       FIGS. 4A and 4B  are conceptual diagrams illustrating a process for mounting the transformer  10  on the mounting substrate  80  by using the mounting machine. As illustrated in  FIG. 6 , the mounting substrate  80  has a pair of a land pattern  87  and the land pattern  88  in which the first and second installation portions  72  and  73  of the shield member  60  are installed and the other land patterns  81 ,  82 ,  83 ,  84 , and  86  different from the pair of land patterns  87  and  88 . The terminals  31 ,  32 ,  33 ,  34 , and  35  are installed in the land patterns  81 ,  82 ,  83 ,  84 , and  86 . The mounting machine transports the transformer  10  to the Z axis positive direction side of the mounting surface  80   c,  where the land patterns  81  to  84  and  86  to  88  illustrated in  FIG. 6  are formed. 
     Illustrated in  FIG. 4A  is a state immediately after the transformer  10  is brought into contact with the mounting surface  80   c  by the mounting machine. The mounting machine holds the transformer  10  via the shield member  60  in transporting the transformer  10 . More specifically, the mounting machine holds the transformer  10  by adsorbing the top plate portion  63  of the shielding portion  62  from above. 
     The bobbin  20  and the core  50  and the wire member  40  attached to the bobbin  20  are put into a state of hanging from the shield member  60  while the mounting machine transports the transformer  10  and the terminals  33  and  36  come into contact with the mounting substrate  80  as illustrated in  FIG. 4A , and thus the bobbin  20  is positioned closest to the Z axis negative direction side relative to the shield member  60  by the weight of the bobbin  20 . Accordingly, as illustrated in  FIG. 4A , the lower end of the second installation portion  73  is positioned above the lower ends of the terminals  33  and  36  (on the Z axis positive direction side). In this state, the engagement receiving portions  28  and  29  of the bobbin  20  illustrated in  FIG. 1  are in contact with the lower ends of the engagement holes  68   a  and  68   b  of the engagement portion  66 . Although the first installation portion  72  is not illustrated in  FIGS. 4A and 4B , the first installation portion  72  is similar to the second installation portion  73  with regard to the positional relationship in the Z axis direction with respect to the terminals  33  and  36 . 
     As illustrated in  FIG. 4A , once the mounting machine lowers the transformer  10  toward the mounting surface  80   c  at the mounting position, the terminals  33  and  36  provided in the bobbin  20  come into contact with the mounting surface  80   c  and are installed on the mounting substrate  80 . In a state immediately after the contact between the terminals  33  and  36  and the mounting surface  80   c,  the second installation portion  73  of the shielding portion  62  is afloat with respect to the mounting surface  80   c  of the mounting substrate  80  and is not in contact with the mounting surface  80   c.    
     After the state that is illustrated in  FIG. 4A , the mounting machine further pushes the shielding portion  62  downward (to the Z axis negative direction side), and then the shielding portion  62  moves downward relative to, for example, the bobbin  20  and the terminals  33  and  36 . Then, the second installation portion  73  of the shielding portion  62  comes into contact with the mounting surface  80   c  and is installed on the mounting substrate  80  as illustrated in  FIG. 4B . Despite the contact between the second installation portion  73  of the shielding portion  62  and the mounting surface  80   c,  the contact state between the terminals  33  and  36  and the mounting surface  80   c  is maintained by the weight of the bobbin  20 , the weight of the core  50 , and the like. Accordingly, in the state that is illustrated in  FIG. 4B , the lower ends of the terminals  33  and  36  and the lower end of the second installation portion  73  are aligned on the same plane. In this state, the engagement receiving portions  28  and  29  of the bobbin  20  illustrated in  FIG. 1  are moved upward from the lower ends of the engagement holes  68   a  and  68   b  of the engagement portion  66  and are not in contact with the lower ends of the engagement holes  68   a  and  68   b.    
     After the transformer  10  is installed on the mounting substrate  80  in this manner, the transformer  10  is joined to and mounted on the mounting substrate  80  through, for example, a reflow process.  FIG. 7  is a cross-sectional view of electronic equipment  92  having the transformer  10  mounted through the process that has been described with reference to  FIGS. 4A and 4B . As described above, the pair of first and second installation portions  72  and  73  of the shielding portion  62  are installed in the pair of land patterns  87  and  88 . The mounting substrate  80  has a conductor portion  89  interconnecting the pair of land patterns  87  and  88 . 
     As illustrated in  FIGS. 6 and 7 , the conductor portion  89  is embedded in the mounting substrate  80  and is not exposed to the mounting surface  80   c.  In contrast, the pair of land patterns  87  and  88  and the land patterns  81 ,  82 ,  83 ,  84 , and  86  in which the terminals  31 ,  32 ,  33 ,  34 , and  36  of the transformer  10  are installed are exposed to the mounting surface  80   c  as illustrated in  FIG. 6 . The conductor portion  89  and the land patterns  81 ,  82 ,  83 ,  84 ,  86 ,  87 , and  88  of the mounting substrate  80  are made of a good conductor such as metal. A print substrate and the like can be used as the mounting substrate  80 . For example, a rigid substrate, a flexible substrate, and the like can be used as the mounting substrate  80 . The substrates are not particularly limited. 
     The shield member  60  illustrated in  FIGS. 1 and 2  is preferably made of a high-magnetic permeability material such as a metal material. Examples of the material include aluminum, iron, nickel, and stainless steel. The bobbin  20  illustrated in  FIGS. 1 and 2  is produced by the conductive terminals  31  to  36  made of metal or the like being fixed by insert molding or the like to a plastic insulating material such as PPS, PET, PBT, LCP, and nylon. 
     As illustrated in  FIG. 7 , the top plate portion  63  of the shield member  60  and the conductor portion  89  of the mounting substrate  80  are disposed so as to sandwich the winding portion  42  and the core  50  from both sides in the mounting direction. Further, the first side plate portion  64  and the second side plate portion  65  are disposed so as to sandwich the winding portion  42  and the core  50  from both sides in the X axis direction orthogonal to the mounting direction. As a result, in the electronic equipment  92 , the shield member  60  surrounds the three directions of the Z axis positive direction outside, the X axis positive direction outside, and the X axis negative direction outside of the winding portion  42 , and the conductor portion  89  of the mounting substrate  80  is disposed on the Z axis negative direction outside of the winding portion  42 . The electronic equipment  92  is capable of effectively preventing magnetic flux leakage from the winding portion  42  or the core  50 . 
     As described above with reference to  FIGS. 4A and 4B , in the transformer  10 , the first and second engagement portions  68  and  69  of the shield member  60  are engaged so as to be relatively movable along the mounting direction with respect to the bobbin  20 . Accordingly, when the transformer  10  is installed on the mounting substrate  80 , both the first and second installation portions  72  and  73  of the shield member  60  and the terminals  31 ,  32 ,  33 ,  34 , and  36  of the bobbin  20  can be disposed at an appropriate height with respect to each of the land patterns  81 ,  82 ,  83 ,  84 ,  86 ,  87 , and  88  of the mounting substrate  80 . Accordingly, the transformer  10  is capable of preventing the problem of the terminals  31 ,  32 ,  33 ,  34 , and  36  or the installation portion  70  floating from the land patterns  81 ,  82 ,  83 ,  84 ,  86 ,  87 , and  88  of the mounting substrate  80  when the transformer  10  is installed on the mounting substrate  80  and effectively preventing a connection failure of the transformer  10 . 
     The height of the installation portion  70  of the shield member  60  and the heights of the terminals  31  to  36  do not have to be aligned during manufacturing of the transformer  10 , and thus a sufficient assembly tolerance can be easily ensured and productivity is ensured to a satisfactory extent with the transformer  10 . In addition, no wiring needs to be performed on the shield member  60  and the terminals  31  to  36 , and thus the productivity of the transformer  10  is excellent in this regard as well. 
     As illustrated in  FIGS. 4A and 4B , in the transformer  10 , the first and second engagement portions  68  and  69  are engaged from both Y axis direction sides with respect to the engagement receiving portions  28  and  29  formed in the flange portions  26  and  27  of the bobbin  20 . Accordingly, when the mounting machine transports the transformer  10 , the shield member  60  is capable of supporting the core  50 , the bobbin  20 , the wire member  40 , and the like in a balanced manner and from above in a state of being movable relative to the shield member  60 . 
     Although not illustrated in  FIG. 7 , the electronic equipment  92  may have a potting resin covering the mounting surface  80   c  and the surface of the transformer  10 . In electronic equipment having a potting resin, stress resulting from the thermal expansion of the potting resin or the like may act on the fixing part between the transformer  10  and the mounting substrate  80 . In the transformer  10  illustrated in  FIG. 7 , the terminals  31 ,  32 ,  33 ,  34 , and  36  and the installation portion  70  are reliably connected and fixed with respect to the land patterns  81 ,  82 ,  83 ,  84 ,  86 ,  87 , and  88  of the mounting substrate  80 . Accordingly, even in a case where the stress resulting from the thermal expansion of the potting resin or the like acts on the fixing part, it is possible to effectively prevent the problem of the stress resulting in a connection failure or the like. 
     Although the surface mounting coil device and the electronic equipment according to the invention have been described above based on the embodiment, the invention is not limited to the embodiments. It is a matter of course that many other embodiments, modification examples, and the like are included in the invention. For example, the shielding portion  62  in the shield member  60  is not limited to one having the top plate portion  63  and the first and second side plate portions  64  and  65 . Alternatively, the shielding portion  62  in the shield member  60  may be one having only the top plate portion  63  or one having only one of the first side plate portion  64  and the second side plate portion  65 . 
     Although the engagement holes  68   a  and  68   b  are formed in the engagement portion  66  of the shield member  60  and the engagement receiving portions  28  and  29  of the bobbin  20  are projections in the transformer  10  illustrated in  FIG. 1 , the shapes of the engagement portion  66  and the engagement receiving portions  28  and  29  are not limited thereto. For example, the engagement portion of the shield member and the engagement receiving portion of the bobbin can be any engagement structures engaged in a relatively movable manner such as holes, grooves, and projections. In addition, the invention is not limited to the transformer  10  illustrated in the embodiment. The invention is applicable to surface mounting coil devices other than the transformer  10  as well.